sql_acl.cc 99.2 KB
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/* Copyright (C) 2000 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/*
  The privileges are saved in the following tables:
  mysql/user	 ; super user who are allowed to do almoust anything
  mysql/host	 ; host priviliges. This is used if host is empty in mysql/db.
  mysql/db	 ; database privileges / user

  data in tables is sorted according to how many not-wild-cards there is
  in the relevant fields. Empty strings comes last.
*/

#include "mysql_priv.h"
#include "sql_acl.h"
#include "hash_filo.h"
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#ifdef HAVE_REPLICATION
#include "sql_repl.h" //for tables_ok()
#endif
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#include <m_ctype.h>
#include <stdarg.h>

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class acl_entry :public hash_filo_element
{
public:
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  ulong access;
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  uint16 length;
  char key[1];					// Key will be stored here
};

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static byte* acl_entry_get_key(acl_entry *entry,uint *length,
			       my_bool not_used __attribute__((unused)))
{
  *length=(uint) entry->length;
  return (byte*) entry->key;
}

#define ACL_KEY_LENGTH (sizeof(long)+NAME_LEN+17)

static DYNAMIC_ARRAY acl_hosts,acl_users,acl_dbs;
static MEM_ROOT mem, memex;
static bool initialized=0;
static bool allow_all_hosts=1;
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static HASH acl_check_hosts, column_priv_hash;
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static DYNAMIC_ARRAY acl_wild_hosts;
static hash_filo *acl_cache;
static uint grant_version=0;
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static uint priv_version=0; /* Version of priv tables. incremented by acl_init */
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static ulong get_access(TABLE *form,uint fieldnr);
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static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b);
static ulong get_sort(uint count,...);
static void init_check_host(void);
static ACL_USER *find_acl_user(const char *host, const char *user);
static bool update_user_table(THD *thd, const char *host, const char *user,
			      const char *new_password);
static void update_hostname(acl_host_and_ip *host, const char *hostname);
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static bool compare_hostname(const acl_host_and_ip *host,const char *hostname,
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			     const char *ip);

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/*
  Read grant privileges from the privilege tables in the 'mysql' database.

  SYNOPSIS
    acl_init()
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    thd				Thread handler
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    dont_read_acl_tables	Set to 1 if run with --skip-grant

  RETURN VALUES
    0	ok
    1	Could not initialize grant's
*/


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my_bool acl_init(THD *org_thd, bool dont_read_acl_tables)
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{
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  THD  *thd;
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  TABLE_LIST tables[3];
  TABLE *table;
  READ_RECORD read_record_info;
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  MYSQL_LOCK *lock;
  my_bool return_val=1;
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  DBUG_ENTER("acl_init");

  if (!acl_cache)
    acl_cache=new hash_filo(ACL_CACHE_SIZE,0,0,
			    (hash_get_key) acl_entry_get_key,
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			    (hash_free_key) free, system_charset_info);
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  if (dont_read_acl_tables)
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  {
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    DBUG_RETURN(0); /* purecov: tested */
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  }

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  priv_version++; /* Privileges updated */
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  /*
    To be able to run this from boot, we allocate a temporary THD
  */
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  if (!(thd=new THD))
    DBUG_RETURN(1); /* purecov: inspected */
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  thd->store_globals();
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  /* Use passwords according to command line option */
  use_old_passwords= opt_old_passwords;
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  acl_cache->clear(1);				// Clear locked hostname cache
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  thd->db= my_strdup("mysql",MYF(0));
  thd->db_length=5;				// Safety
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  bzero((char*) &tables,sizeof(tables));
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  tables[0].alias=tables[0].real_name=(char*) "host";
  tables[1].alias=tables[1].real_name=(char*) "user";
  tables[2].alias=tables[2].real_name=(char*) "db";
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  tables[0].next=tables+1;
  tables[1].next=tables+2;
  tables[0].lock_type=tables[1].lock_type=tables[2].lock_type=TL_READ;
  tables[0].db=tables[1].db=tables[2].db=thd->db;

  if (open_tables(thd,tables))
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  {
    sql_print_error("Fatal error: Can't open privilege tables: %s",
		    thd->net.last_error);
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    goto end;
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  }
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  TABLE *ptr[3];				// Lock tables for quick update
  ptr[0]= tables[0].table;
  ptr[1]= tables[1].table;
  ptr[2]= tables[2].table;
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  if (!(lock=mysql_lock_tables(thd,ptr,3)))
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  {
    sql_print_error("Fatal error: Can't lock privilege tables: %s",
		    thd->net.last_error);
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    goto end;
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  }
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  init_sql_alloc(&mem,1024,0);
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  init_read_record(&read_record_info,thd,table= tables[0].table,NULL,1,0);
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  VOID(my_init_dynamic_array(&acl_hosts,sizeof(ACL_HOST),20,50));
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  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_HOST host;
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    update_hostname(&host.host,get_field(&mem, table->field[0]));
    host.db=	 get_field(&mem, table->field[1]);
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    host.access= get_access(table,2);
    host.access= fix_rights_for_db(host.access);
    host.sort=   get_sort(2,host.host.hostname,host.db);
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#ifndef TO_BE_REMOVED
    if (table->fields ==  8)
    {						// Without grant
      if (host.access & CREATE_ACL)
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	host.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL | CREATE_TMP_ACL;
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    }
#endif
    VOID(push_dynamic(&acl_hosts,(gptr) &host));
  }
  qsort((gptr) dynamic_element(&acl_hosts,0,ACL_HOST*),acl_hosts.elements,
	sizeof(ACL_HOST),(qsort_cmp) acl_compare);
  end_read_record(&read_record_info);
  freeze_size(&acl_hosts);

  init_read_record(&read_record_info,thd,table=tables[1].table,NULL,1,0);
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  VOID(my_init_dynamic_array(&acl_users,sizeof(ACL_USER),50,100));
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  if (table->field[2]->field_length == 8 &&
      protocol_version == PROTOCOL_VERSION)
  {
    sql_print_error(
	    "Old 'user' table. (Check README or the Reference manual). Continuing --old-protocol"); /* purecov: tested */
    protocol_version=9; /* purecov: tested */
  }

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  DBUG_PRINT("info",("user table fields: %d, password length: %d",
		     table->fields, table->field[2]->field_length));
  if (table->field[2]->field_length < 45 && !use_old_passwords)
  {
    sql_print_error("mysql.user table is not updated to new password format;  Disabling new password usage until mysql_fix_privilege_tables is run");
    use_old_passwords= 1;
  }

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  allow_all_hosts=0;
  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_USER user;
    uint length=0;
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    update_hostname(&user.host,get_field(&mem, table->field[0]));
    user.user=get_field(&mem, table->field[1]);
    user.password=get_field(&mem, table->field[2]);
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    if (user.password && (length=(uint) strlen(user.password)) == 8 &&
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	protocol_version == PROTOCOL_VERSION)
    {
      sql_print_error(
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		      "Found old style password for user '%s'. Ignoring user. (You may want to restart mysqld using --old-protocol)",
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		      user.user ? user.user : ""); /* purecov: tested */
    }
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    else  /* non empty and not short passwords */
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    {
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      user.pversion=get_password_version(user.password);
      /* Only passwords of specific lengths depending on version are allowed */
      if ( (!user.pversion && length % 8) ||  (user.pversion && length!=45 ))
      {
        sql_print_error(
	                "Found invalid password for user: '%s@%s'; Ignoring user",
		        user.user ? user.user : "",
		        user.host.hostname ? user.host.hostname : ""); /* purecov: tested */
        continue;					/* purecov: tested */
      }
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    }
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    get_salt_from_password(user.salt,user.password);
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    user.access=get_access(table,3) & GLOBAL_ACLS;
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    user.sort=get_sort(2,user.host.hostname,user.user);
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    user.hostname_length= (user.host.hostname ?
			   (uint) strlen(user.host.hostname) : 0);
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    if (table->fields >= 31)     /* Starting from 4.0.2 we have more fields */
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    {
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      char *ssl_type=get_field(&mem, table->field[24]);
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      if (!ssl_type)
	user.ssl_type=SSL_TYPE_NONE;
      else if (!strcmp(ssl_type, "ANY"))
	user.ssl_type=SSL_TYPE_ANY;
      else if (!strcmp(ssl_type, "X509"))
	user.ssl_type=SSL_TYPE_X509;
      else  /* !strcmp(ssl_type, "SPECIFIED") */
	user.ssl_type=SSL_TYPE_SPECIFIED;

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      user.ssl_cipher=   get_field(&mem, table->field[25]);
      user.x509_issuer=  get_field(&mem, table->field[26]);
      user.x509_subject= get_field(&mem, table->field[27]);
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      char *ptr = get_field(&mem, table->field[28]);
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      user.user_resource.questions=atoi(ptr);
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      ptr = get_field(&mem, table->field[29]);
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      user.user_resource.updates=atoi(ptr);
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      ptr = get_field(&mem, table->field[30]);
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      user.user_resource.connections=atoi(ptr);
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      if (user.user_resource.questions || user.user_resource.updates ||
	  user.user_resource.connections)
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	mqh_used=1;
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    }
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    else
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    {
      user.ssl_type=SSL_TYPE_NONE;
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      bzero(&(user.user_resource),sizeof(user.user_resource));
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#ifndef TO_BE_REMOVED
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      if (table->fields <= 13)
      {						// Without grant
	if (user.access & CREATE_ACL)
	  user.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL;
      }
      /* Convert old privileges */
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      user.access|= LOCK_TABLES_ACL | CREATE_TMP_ACL | SHOW_DB_ACL;
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      if (user.access & FILE_ACL)
	user.access|= REPL_CLIENT_ACL | REPL_SLAVE_ACL;
      if (user.access & PROCESS_ACL)
	user.access|= SUPER_ACL | EXECUTE_ACL;
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#endif
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    }
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    VOID(push_dynamic(&acl_users,(gptr) &user));
    if (!user.host.hostname || user.host.hostname[0] == wild_many &&
	!user.host.hostname[1])
      allow_all_hosts=1;			// Anyone can connect
  }
  qsort((gptr) dynamic_element(&acl_users,0,ACL_USER*),acl_users.elements,
	sizeof(ACL_USER),(qsort_cmp) acl_compare);
  end_read_record(&read_record_info);
  freeze_size(&acl_users);
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  init_read_record(&read_record_info,thd,table=tables[2].table,NULL,1,0);
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  VOID(my_init_dynamic_array(&acl_dbs,sizeof(ACL_DB),50,100));
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  while (!(read_record_info.read_record(&read_record_info)))
  {
    ACL_DB db;
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    update_hostname(&db.host,get_field(&mem, table->field[0]));
    db.db=get_field(&mem, table->field[1]);
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    if (!db.db)
    {
      sql_print_error("Found an entry in the 'db' table with empty database name; Skipped");
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      continue;
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    }
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    db.user=get_field(&mem, table->field[2]);
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    db.access=get_access(table,3);
    db.access=fix_rights_for_db(db.access);
    db.sort=get_sort(3,db.host.hostname,db.db,db.user);
#ifndef TO_BE_REMOVED
    if (table->fields <=  9)
    {						// Without grant
      if (db.access & CREATE_ACL)
	db.access|=REFERENCES_ACL | INDEX_ACL | ALTER_ACL;
    }
#endif
    VOID(push_dynamic(&acl_dbs,(gptr) &db));
  }
  qsort((gptr) dynamic_element(&acl_dbs,0,ACL_DB*),acl_dbs.elements,
	sizeof(ACL_DB),(qsort_cmp) acl_compare);
  end_read_record(&read_record_info);
  freeze_size(&acl_dbs);
  init_check_host();

  mysql_unlock_tables(thd, lock);
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  initialized=1;
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  thd->version--;				// Force close to free memory
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  return_val=0;

end:
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  close_thread_tables(thd);
  delete thd;
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  if (org_thd)
    org_thd->store_globals();			/* purecov: inspected */
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  else
  {
    /* Remember that we don't have a THD */
    my_pthread_setspecific_ptr(THR_THD,  0);
  }
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  DBUG_RETURN(return_val);
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}


void acl_free(bool end)
{
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  free_root(&mem,MYF(0));
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  delete_dynamic(&acl_hosts);
  delete_dynamic(&acl_users);
  delete_dynamic(&acl_dbs);
  delete_dynamic(&acl_wild_hosts);
  hash_free(&acl_check_hosts);
  if (!end)
    acl_cache->clear(1); /* purecov: inspected */
  else
  {
    delete acl_cache;
    acl_cache=0;
  }
}

	/* Reload acl list if possible */

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void acl_reload(THD *thd)
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{
  DYNAMIC_ARRAY old_acl_hosts,old_acl_users,old_acl_dbs;
  MEM_ROOT old_mem;
  bool old_initialized;
  DBUG_ENTER("acl_reload");

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  if (thd && thd->locked_tables)
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  {					// Can't have locked tables here
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    thd->lock=thd->locked_tables;
    thd->locked_tables=0;
    close_thread_tables(thd);
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  }
  if ((old_initialized=initialized))
    VOID(pthread_mutex_lock(&acl_cache->lock));

  old_acl_hosts=acl_hosts;
  old_acl_users=acl_users;
  old_acl_dbs=acl_dbs;
  old_mem=mem;
  delete_dynamic(&acl_wild_hosts);
  hash_free(&acl_check_hosts);

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  if (acl_init(thd, 0))
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  {					// Error. Revert to old list
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    DBUG_PRINT("error",("Reverting to old privileges"));
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    acl_free();				/* purecov: inspected */
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    acl_hosts=old_acl_hosts;
    acl_users=old_acl_users;
    acl_dbs=old_acl_dbs;
    mem=old_mem;
    init_check_host();
  }
  else
  {
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    free_root(&old_mem,MYF(0));
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    delete_dynamic(&old_acl_hosts);
    delete_dynamic(&old_acl_users);
    delete_dynamic(&old_acl_dbs);
  }
  if (old_initialized)
    VOID(pthread_mutex_unlock(&acl_cache->lock));
  DBUG_VOID_RETURN;
}


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/*
  Get all access bits from table after fieldnr
  We know that the access privileges ends when there is no more fields
  or the field is not an enum with two elements.
*/
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static ulong get_access(TABLE *form, uint fieldnr)
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{
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  ulong access_bits=0,bit;
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  char buff[2];
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  String res(buff,sizeof(buff),&my_charset_latin1);
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  Field **pos;

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  for (pos=form->field+fieldnr, bit=1;
       *pos && (*pos)->real_type() == FIELD_TYPE_ENUM &&
	 ((Field_enum*) (*pos))->typelib->count == 2 ;
       pos++ , bit<<=1)
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  {
    (*pos)->val_str(&res,&res);
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    if (my_toupper(&my_charset_latin1, res[0]) == 'Y')
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      access_bits|= bit;
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  }
  return access_bits;
}


/*
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  Return a number which, if sorted 'desc', puts strings in this order:
    no wildcards
    wildcards
    empty string
*/
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static ulong get_sort(uint count,...)
{
  va_list args;
  va_start(args,count);
  ulong sort=0;

  while (count--)
  {
    char *str=va_arg(args,char*);
    uint chars=0,wild=0;

    if (str)
    {
      for (; *str ; str++)
      {
	if (*str == wild_many || *str == wild_one || *str == wild_prefix)
	  wild++;
	else
	  chars++;
      }
    }
    sort= (sort << 8) + (wild ? 1 : chars ? 2 : 0);
  }
  va_end(args);
  return sort;
}


static int acl_compare(ACL_ACCESS *a,ACL_ACCESS *b)
{
  if (a->sort > b->sort)
    return -1;
  if (a->sort < b->sort)
    return 1;
  return 0;
}

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/*
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  Prepare crypted scramble to be sent to the client
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*/

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void prepare_scramble(THD *thd, ACL_USER *acl_user,char* prepared_scramble)
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{
  /* Binary password format to be used for generation*/
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  char bin_password[SCRAMBLE41_LENGTH];
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  /* Generate new long scramble for the thread */
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  create_random_string(SCRAMBLE41_LENGTH,&thd->rand,thd->scramble);
  thd->scramble[SCRAMBLE41_LENGTH]=0;
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  /* Get binary form, First 4 bytes of prepared scramble is salt */
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  get_hash_and_password(acl_user->salt,acl_user->pversion,prepared_scramble,
			(unsigned char*) bin_password);
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  /* Store "*" as identifier for old passwords */
  if (!acl_user->pversion)
    prepared_scramble[0]='*';
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  /* Finally encrypt password to get prepared scramble */
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  password_crypt(thd->scramble, prepared_scramble+4, bin_password,
		 SCRAMBLE41_LENGTH);
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}


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/*
  Get master privilges for user (priviliges for all tables).
  Required before connecting to MySQL
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  As we have 2 stage handshake now we cache user not to lookup
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  it second time. At the second stage we do not lookup user in case
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  we already know it;
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*/

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ulong acl_getroot(THD *thd, const char *host, const char *ip, const char *user,
		  const char *password,const char *message,char **priv_user,
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		  char *priv_host, bool old_ver, USER_RESOURCES  *mqh,
		  char *prepared_scramble, uint *cur_priv_version,
		  ACL_USER **cached_user)
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{
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  ulong user_access=NO_ACCESS;
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  *priv_user= (char*) user;
  bool password_correct= 0;
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  int stage= (*cached_user != NULL); /* NULL passed as first stage */
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  ACL_USER *acl_user= NULL;
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  DBUG_ENTER("acl_getroot");
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  bzero(mqh,sizeof(USER_RESOURCES));
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  if (!initialized)
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  {
    // If no data allow anything
    DBUG_RETURN((ulong) ~NO_ACCESS);		/* purecov: tested */
  }
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  VOID(pthread_mutex_lock(&acl_cache->lock));
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  /*
    Get possible access from user_list. This is or'ed to others not
    fully specified
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    If we have cached user use it, in other case look it up.
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  */
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  if (stage && (*cur_priv_version == priv_version))
    acl_user= *cached_user;
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  else
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  {
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    for (uint i=0 ; i < acl_users.elements ; i++)
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    {
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      ACL_USER *acl_user_search=dynamic_element(&acl_users,i,ACL_USER*);
      if (!acl_user_search->user || !strcmp(user,acl_user_search->user))
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      {
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        if (compare_hostname(&acl_user_search->host,host,ip))
        {
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          /* Found mathing user */
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          acl_user= acl_user_search;
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          /* Store it as a cache */
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          *cached_user= acl_user;
          *cur_priv_version= priv_version;
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          break;
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        }
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      }
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    }
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  }
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  /* Now we have acl_user found and may start our checks */
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  if (acl_user)
  {
    /* Password should present for both or absend for both */
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    if (!acl_user->password && !*password)
      password_correct=1;
    else if (!acl_user->password || !*password)
    {
      *cached_user= 0;				// Impossible to connect
    }
    else
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    {
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      /* New version password is checked differently */
      if (acl_user->pversion)
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      {
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	if (stage) /* We check password only on the second stage */
	{
	  if (!validate_password(password,message,acl_user->salt))
	    password_correct=1;
	}
	else  /* First stage - just prepare scramble */
	  prepare_scramble(thd,acl_user,prepared_scramble);
      }
      /* Old way to check password */
      else
      {
	/* Checking the scramble at any stage. First - old clients */
	if (!check_scramble(password,message,acl_user->salt,
			    (my_bool) old_ver))
	  password_correct=1;
	else if (!stage)		/* Here if password incorrect  */
	{
	  /* At the first stage - prepare scramble */
	  prepare_scramble(thd,acl_user,prepared_scramble);
	}
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      }
    }
  }
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  /* If user not found password_correct will also be zero */
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  if (!password_correct)
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    goto unlock_and_exit;
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  /* OK. User found and password checked continue validation */
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  {
    Vio *vio=thd->net.vio;
    /*
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      At this point we know that user is allowed to connect
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      from given host by given username/password pair. Now
      we check if SSL is required, if user is using SSL and
      if X509 certificate attributes are OK
    */
    switch (acl_user->ssl_type) {
    case SSL_TYPE_NOT_SPECIFIED:		// Impossible
    case SSL_TYPE_NONE: /* SSL is not required to connect */
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      user_access=acl_user->access;
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      break;
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#ifdef HAVE_OPENSSL
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    case SSL_TYPE_ANY: /* Any kind of SSL is good enough */
      if (vio_type(vio) == VIO_TYPE_SSL)
	user_access=acl_user->access;
      break;
    case SSL_TYPE_X509: /* Client should have any valid certificate. */
      /*
	Connections with non-valid certificates are dropped already
	in sslaccept() anyway, so we do not check validity here.
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	We need to check for absence of SSL because without SSL
	we should reject connection.
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      */
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      if (vio_type(vio) == VIO_TYPE_SSL && SSL_get_peer_certificate(vio->ssl_))
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	user_access=acl_user->access;
      break;
    case SSL_TYPE_SPECIFIED: /* Client should have specified attrib */
      /*
	We do not check for absence of SSL because without SSL it does
	not pass all checks here anyway.
	If cipher name is specified, we compare it to actual cipher in
	use.
      */
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      if (vio_type(vio) != VIO_TYPE_SSL)
	break;
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      if (acl_user->ssl_cipher)
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      {
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	DBUG_PRINT("info",("comparing ciphers: '%s' and '%s'",
			   acl_user->ssl_cipher,SSL_get_cipher(vio->ssl_)));
	if (!strcmp(acl_user->ssl_cipher,SSL_get_cipher(vio->ssl_)))
	  user_access=acl_user->access;
	else
	{
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	  if (global_system_variables.log_warnings)
	    sql_print_error("X509 ciphers mismatch: should be '%s' but is '%s'",
			    acl_user->ssl_cipher,
			    SSL_get_cipher(vio->ssl_));
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	  user_access=NO_ACCESS;
	  break;
	}
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      }
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      /* Prepare certificate (if exists) */
      DBUG_PRINT("info",("checkpoint 1"));
      X509* cert=SSL_get_peer_certificate(vio->ssl_);
      DBUG_PRINT("info",("checkpoint 2"));
      /* If X509 issuer is speified, we check it... */
      if (acl_user->x509_issuer)
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      {
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	DBUG_PRINT("info",("checkpoint 3"));
	char *ptr = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0);
	DBUG_PRINT("info",("comparing issuers: '%s' and '%s'",
			   acl_user->x509_issuer, ptr));
	if (strcmp(acl_user->x509_issuer, ptr))
	{
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	  if (global_system_variables.log_warnings)
	    sql_print_error("X509 issuer mismatch: should be '%s' but is '%s'",
			    acl_user->x509_issuer, ptr);
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	  user_access=NO_ACCESS;
	  free(ptr);
	  break;
	}
	user_access=acl_user->access;
	free(ptr);
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      }
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      DBUG_PRINT("info",("checkpoint 4"));
      /* X509 subject is specified, we check it .. */
      if (acl_user->x509_subject)
      {
	char *ptr= X509_NAME_oneline(X509_get_subject_name(cert), 0, 0);
	DBUG_PRINT("info",("comparing subjects: '%s' and '%s'",
			   acl_user->x509_subject, ptr));
	if (strcmp(acl_user->x509_subject,ptr))
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	{
	  if (global_system_variables.log_warnings)
	    sql_print_error("X509 subject mismatch: '%s' vs '%s'",
			    acl_user->x509_subject, ptr);
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	  user_access=NO_ACCESS;
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	}
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	else
	  user_access=acl_user->access;
	free(ptr);
      }
      break;
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#else /* HAVE_OPENSSL */
    default: 
      /*
         If we don't have SSL but SSL is required for this user the 
         authentication should fail.
       */
      break;
#endif /* HAVE_OPENSSL */
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    }
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  }
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  *mqh=acl_user->user_resource;
  if (!acl_user->user)
    *priv_user=(char*) "";	// Change to anonymous user /* purecov: inspected */
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  if (acl_user->host.hostname)
    strmake(priv_host, acl_user->host.hostname, MAX_HOSTNAME);
  else
    *priv_host= 0;

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unlock_and_exit:
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  VOID(pthread_mutex_unlock(&acl_cache->lock));
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  DBUG_RETURN(user_access);
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}


static byte* check_get_key(ACL_USER *buff,uint *length,
			   my_bool not_used __attribute__((unused)))
{
  *length=buff->hostname_length;
  return (byte*) buff->host.hostname;
}

static void acl_update_user(const char *user, const char *host,
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			    const char *password,
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			    enum SSL_type ssl_type,
			    const char *ssl_cipher,
			    const char *x509_issuer,
			    const char *x509_subject,
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			    USER_RESOURCES  *mqh,
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			    ulong privileges)
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{
  for (uint i=0 ; i < acl_users.elements ; i++)
  {
    ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
    if (!acl_user->user && !user[0] ||
	acl_user->user &&
	!strcmp(user,acl_user->user))
    {
      if (!acl_user->host.hostname && !host[0] ||
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	  acl_user->host.hostname &&
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	  !my_strcasecmp(&my_charset_latin1, host, acl_user->host.hostname))
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      {
	acl_user->access=privileges;
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	if (mqh->bits & 1)
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	  acl_user->user_resource.questions=mqh->questions;
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	if (mqh->bits & 2)
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	  acl_user->user_resource.updates=mqh->updates;
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	if (mqh->bits & 4)
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	  acl_user->user_resource.connections=mqh->connections;
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	if (ssl_type != SSL_TYPE_NOT_SPECIFIED)
	{
	  acl_user->ssl_type= ssl_type;
	  acl_user->ssl_cipher= (ssl_cipher ? strdup_root(&mem,ssl_cipher) :
				 0);
	  acl_user->x509_issuer= (x509_issuer ? strdup_root(&mem,x509_issuer) :
				  0);
	  acl_user->x509_subject= (x509_subject ?
				   strdup_root(&mem,x509_subject) : 0);
	}
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	if (password)
	{
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	  if (!password[0]) /* If password is empty set it to null */
          {
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	    acl_user->password=0;
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            acl_user->pversion=0; // just initialize
          }
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	  else
	  {
	    acl_user->password=(char*) "";	// Just point at something
	    get_salt_from_password(acl_user->salt,password);
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	    acl_user->pversion=get_password_version(acl_user->password);
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	  }
	}
	break;
      }
    }
  }
}


static void acl_insert_user(const char *user, const char *host,
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			    const char *password,
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			    enum SSL_type ssl_type,
			    const char *ssl_cipher,
			    const char *x509_issuer,
			    const char *x509_subject,
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			    USER_RESOURCES *mqh,
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			    ulong privileges)
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{
  ACL_USER acl_user;
  acl_user.user=strdup_root(&mem,user);
  update_hostname(&acl_user.host,strdup_root(&mem,host));
  acl_user.password=0;
  acl_user.access=privileges;
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  acl_user.user_resource = *mqh;
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  acl_user.sort=get_sort(2,acl_user.host.hostname,acl_user.user);
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  acl_user.hostname_length=(uint) strlen(acl_user.host.hostname);
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  acl_user.ssl_type= (ssl_type != SSL_TYPE_NOT_SPECIFIED ?
		      ssl_type : SSL_TYPE_NONE);
  acl_user.ssl_cipher=	ssl_cipher   ? strdup_root(&mem,ssl_cipher) : 0;
  acl_user.x509_issuer= x509_issuer  ? strdup_root(&mem,x509_issuer) : 0;
  acl_user.x509_subject=x509_subject ? strdup_root(&mem,x509_subject) : 0;
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  if (password)
  {
    acl_user.password=(char*) "";		// Just point at something
    get_salt_from_password(acl_user.salt,password);
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    acl_user.pversion=get_password_version(password);
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  }

  VOID(push_dynamic(&acl_users,(gptr) &acl_user));
  if (!acl_user.host.hostname || acl_user.host.hostname[0] == wild_many
      && !acl_user.host.hostname[1])
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    allow_all_hosts=1;		// Anyone can connect /* purecov: tested */
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  qsort((gptr) dynamic_element(&acl_users,0,ACL_USER*),acl_users.elements,
	sizeof(ACL_USER),(qsort_cmp) acl_compare);

  /* We must free acl_check_hosts as its memory is mapped to acl_user */
  delete_dynamic(&acl_wild_hosts);
  hash_free(&acl_check_hosts);
  init_check_host();
}


static void acl_update_db(const char *user, const char *host, const char *db,
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			  ulong privileges)
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{
  for (uint i=0 ; i < acl_dbs.elements ; i++)
  {
    ACL_DB *acl_db=dynamic_element(&acl_dbs,i,ACL_DB*);
    if (!acl_db->user && !user[0] ||
	acl_db->user &&
	!strcmp(user,acl_db->user))
    {
      if (!acl_db->host.hostname && !host[0] ||
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	  acl_db->host.hostname &&
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	  !my_strcasecmp(&my_charset_latin1, host, acl_db->host.hostname))
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      {
	if (!acl_db->db && !db[0] ||
	    acl_db->db && !strcmp(db,acl_db->db))
	{
	  if (privileges)
	    acl_db->access=privileges;
	  else
	    delete_dynamic_element(&acl_dbs,i);
	}
      }
    }
  }
}


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/*
  Insert a user/db/host combination into the global acl_cache

  SYNOPSIS
    acl_insert_db()
    user		User name
    host		Host name
    db			Database name
    privileges		Bitmap of privileges

  NOTES
    acl_cache->lock must be locked when calling this
*/

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static void acl_insert_db(const char *user, const char *host, const char *db,
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			  ulong privileges)
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{
  ACL_DB acl_db;
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  safe_mutex_assert_owner(&acl_cache->lock);
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  acl_db.user=strdup_root(&mem,user);
  update_hostname(&acl_db.host,strdup_root(&mem,host));
  acl_db.db=strdup_root(&mem,db);
  acl_db.access=privileges;
  acl_db.sort=get_sort(3,acl_db.host.hostname,acl_db.db,acl_db.user);
  VOID(push_dynamic(&acl_dbs,(gptr) &acl_db));
  qsort((gptr) dynamic_element(&acl_dbs,0,ACL_DB*),acl_dbs.elements,
	sizeof(ACL_DB),(qsort_cmp) acl_compare);
}


/*****************************************************************************
** Get privilege for a host, user and db combination
*****************************************************************************/

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ulong acl_get(const char *host, const char *ip, const char *bin_ip,
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	     const char *user, const char *db, my_bool db_is_pattern)
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{
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  ulong host_access,db_access;
  uint i,key_length;
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  db_access=0; host_access= ~0;
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  char key[ACL_KEY_LENGTH],*tmp_db,*end;
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  acl_entry *entry;

  VOID(pthread_mutex_lock(&acl_cache->lock));
  memcpy_fixed(&key,bin_ip,sizeof(struct in_addr));
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  end=strmov((tmp_db=strmov(key+sizeof(struct in_addr),user)+1),db);
  if (lower_case_table_names)
  {
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    my_casedn_str(&my_charset_latin1, tmp_db);
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    db=tmp_db;
  }
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  key_length=(uint) (end-key);
  if ((entry=(acl_entry*) acl_cache->search(key,key_length)))
  {
    db_access=entry->access;
    VOID(pthread_mutex_unlock(&acl_cache->lock));
    return db_access;
  }

  /*
    Check if there are some access rights for database and user
  */
  for (i=0 ; i < acl_dbs.elements ; i++)
  {
    ACL_DB *acl_db=dynamic_element(&acl_dbs,i,ACL_DB*);
    if (!acl_db->user || !strcmp(user,acl_db->user))
    {
      if (compare_hostname(&acl_db->host,host,ip))
      {
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	if (!acl_db->db || !wild_compare(db,acl_db->db,db_is_pattern))
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	{
	  db_access=acl_db->access;
	  if (acl_db->host.hostname)
	    goto exit;				// Fully specified. Take it
	  break; /* purecov: tested */
	}
      }
    }
  }
  if (!db_access)
    goto exit;					// Can't be better

  /*
    No host specified for user. Get hostdata from host table
  */
  host_access=0;				// Host must be found
  for (i=0 ; i < acl_hosts.elements ; i++)
  {
    ACL_HOST *acl_host=dynamic_element(&acl_hosts,i,ACL_HOST*);
    if (compare_hostname(&acl_host->host,host,ip))
    {
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      if (!acl_host->db || !wild_compare(db,acl_host->db,db_is_pattern))
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      {
	host_access=acl_host->access;		// Fully specified. Take it
	break;
      }
    }
  }
exit:
  /* Save entry in cache for quick retrieval */
  if ((entry= (acl_entry*) malloc(sizeof(acl_entry)+key_length)))
  {
    entry->access=(db_access & host_access);
    entry->length=key_length;
    memcpy((gptr) entry->key,key,key_length);
    acl_cache->add(entry);
  }
  VOID(pthread_mutex_unlock(&acl_cache->lock));
  return (db_access & host_access);
}


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int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr)
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{
  reg3 int flag;
  DBUG_ENTER("wild_case_compare");
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  DBUG_PRINT("enter",("str: '%s'  wildstr: '%s'",str,wildstr));
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  while (*wildstr)
  {
    while (*wildstr && *wildstr != wild_many && *wildstr != wild_one)
    {
      if (*wildstr == wild_prefix && wildstr[1])
	wildstr++;
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      if (my_toupper(cs, *wildstr++) !=
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          my_toupper(cs, *str++)) DBUG_RETURN(1);
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    }
    if (! *wildstr ) DBUG_RETURN (*str != 0);
    if (*wildstr++ == wild_one)
    {
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      if (! *str++) DBUG_RETURN (1);	/* One char; skip */
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    }
    else
    {						/* Found '*' */
      if (!*wildstr) DBUG_RETURN(0);		/* '*' as last char: OK */
      flag=(*wildstr != wild_many && *wildstr != wild_one);
      do
      {
	if (flag)
	{
	  char cmp;
	  if ((cmp= *wildstr) == wild_prefix && wildstr[1])
	    cmp=wildstr[1];
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	  cmp=my_toupper(cs, cmp);
	  while (*str && my_toupper(cs, *str) != cmp)
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	    str++;
	  if (!*str) DBUG_RETURN (1);
	}
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	if (wild_case_compare(cs, str,wildstr) == 0) DBUG_RETURN (0);
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      } while (*str++);
      DBUG_RETURN(1);
    }
  }
  DBUG_RETURN (*str != '\0');
}

/*****************************************************************************
** check if there are any possible matching entries for this host
** All host names without wild cards are stored in a hash table,
** entries with wildcards are stored in a dynamic array
*****************************************************************************/

static void init_check_host(void)
{
  DBUG_ENTER("init_check_host");
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  VOID(my_init_dynamic_array(&acl_wild_hosts,sizeof(struct acl_host_and_ip),
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			  acl_users.elements,1));
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  VOID(hash_init(&acl_check_hosts,&my_charset_latin1,acl_users.elements,0,0,
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		 (hash_get_key) check_get_key,0,0));
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  if (!allow_all_hosts)
  {
    for (uint i=0 ; i < acl_users.elements ; i++)
    {
      ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
      if (strchr(acl_user->host.hostname,wild_many) ||
	  strchr(acl_user->host.hostname,wild_one) ||
	  acl_user->host.ip_mask)
      {						// Has wildcard
	uint j;
	for (j=0 ; j < acl_wild_hosts.elements ; j++)
	{					// Check if host already exists
	  acl_host_and_ip *acl=dynamic_element(&acl_wild_hosts,j,
					       acl_host_and_ip *);
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	  if (!my_strcasecmp(&my_charset_latin1,
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                             acl_user->host.hostname, acl->hostname))
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	    break;				// already stored
	}
	if (j == acl_wild_hosts.elements)	// If new
	  (void) push_dynamic(&acl_wild_hosts,(char*) &acl_user->host);
      }
      else if (!hash_search(&acl_check_hosts,(byte*) &acl_user->host,
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			    (uint) strlen(acl_user->host.hostname)))
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      {
	if (hash_insert(&acl_check_hosts,(byte*) acl_user))
	{					// End of memory
	  allow_all_hosts=1;			// Should never happen
	  DBUG_VOID_RETURN;
	}
      }
    }
  }
  freeze_size(&acl_wild_hosts);
  freeze_size(&acl_check_hosts.array);
  DBUG_VOID_RETURN;
}


/* Return true if there is no users that can match the given host */

bool acl_check_host(const char *host, const char *ip)
{
  if (allow_all_hosts)
    return 0;
  VOID(pthread_mutex_lock(&acl_cache->lock));

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  if (host && hash_search(&acl_check_hosts,(byte*) host,(uint) strlen(host)) ||
      ip && hash_search(&acl_check_hosts,(byte*) ip,(uint) strlen(ip)))
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  {
    VOID(pthread_mutex_unlock(&acl_cache->lock));
    return 0;					// Found host
  }
  for (uint i=0 ; i < acl_wild_hosts.elements ; i++)
  {
    acl_host_and_ip *acl=dynamic_element(&acl_wild_hosts,i,acl_host_and_ip*);
    if (compare_hostname(acl, host, ip))
    {
      VOID(pthread_mutex_unlock(&acl_cache->lock));
      return 0;					// Host ok
    }
  }
  VOID(pthread_mutex_unlock(&acl_cache->lock));
  return 1;					// Host is not allowed
}

/*****************************************************************************
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  Change password for the user if it's not an anonymous user
  Note: This should write the error directly to the client!
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*****************************************************************************/

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/*
  Check if the user is allowed to change password

  SYNOPSIS:
    check_change_password()
    thd		THD
    host	hostname for the user
    user	user name
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    RETURN VALUE
    0	OK
    1	ERROR  ; In this case the error is sent to the client.
*/

bool check_change_password(THD *thd, const char *host, const char *user)
{
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  if (!initialized)
  {
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    send_error(thd, ER_PASSWORD_NOT_ALLOWED); /* purecov: inspected */
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    return(1); /* purecov: inspected */
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  }
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  if (!thd->slave_thread &&
      (strcmp(thd->user,user) ||
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       my_strcasecmp(&my_charset_latin1, host, thd->host_or_ip)))
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  {
    if (check_access(thd, UPDATE_ACL, "mysql",0,1))
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      return(1);
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  }
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  if (!thd->slave_thread && !thd->user[0])
  {
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    send_error(thd, ER_PASSWORD_ANONYMOUS_USER);
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    return(1);
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  }
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  return(0);
}


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/*
  Change a password for a user

  SYNOPSIS
    change_password()
    thd			Thread handle
    host		Hostname
    user		User name
    new_password	New password for host@user

  RETURN VALUES
    0	ok
    1	ERROR; In this case the error is sent to the client.
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*/
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bool change_password(THD *thd, const char *host, const char *user,
		     char *new_password)
{
  uint length=0;
  DBUG_ENTER("change_password");
  DBUG_PRINT("enter",("host: '%s'  user: '%s'  new_password: '%s'",
		      host,user,new_password));
  DBUG_ASSERT(host != 0);			// Ensured by parent

  if (check_change_password(thd, host, user))
    DBUG_RETURN(1);

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  /*
    password should always be 0,16 or 45 chars;
    Simple hack to avoid cracking
  */
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  length=(uint) strlen(new_password);
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  if (length != 45)
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    new_password[length & 16]=0;
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  VOID(pthread_mutex_lock(&acl_cache->lock));
  ACL_USER *acl_user;
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  if (!(acl_user= find_acl_user(host,user)))
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  {
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    send_error(thd, ER_PASSWORD_NO_MATCH);
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    VOID(pthread_mutex_unlock(&acl_cache->lock));
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    DBUG_RETURN(1);
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  }
  if (update_user_table(thd,
			acl_user->host.hostname ? acl_user->host.hostname : "",
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			acl_user->user ? acl_user->user : "",
			new_password))
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  {
    VOID(pthread_mutex_unlock(&acl_cache->lock)); /* purecov: deadcode */
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    send_error(thd,0); /* purecov: deadcode */
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    DBUG_RETURN(1); /* purecov: deadcode */
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  }
  get_salt_from_password(acl_user->salt,new_password);
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  acl_user->pversion=get_password_version(new_password);
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  if (!new_password[0])
    acl_user->password=0;
  else
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    acl_user->password=(char*) "";		// Point at something

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  acl_cache->clear(1);				// Clear locked hostname cache
  VOID(pthread_mutex_unlock(&acl_cache->lock));

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  char buff[512]; /* Extend with extended password length*/
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  ulong query_length=
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    my_sprintf(buff,
	       (buff,"SET PASSWORD FOR \"%-.120s\"@\"%-.120s\"=\"%-.120s\"",
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		acl_user->user ? acl_user->user : "",
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		acl_user->host.hostname ? acl_user->host.hostname : "",
		new_password));
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  mysql_update_log.write(thd, buff, query_length);
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  Query_log_event qinfo(thd, buff, query_length, 0);
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  mysql_bin_log.write(&qinfo);
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  DBUG_RETURN(0);
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}


/*
  Find first entry that matches the current user
*/

static ACL_USER *
find_acl_user(const char *host, const char *user)
{
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  DBUG_ENTER("find_acl_user");
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  DBUG_PRINT("enter",("host: '%s'  user: '%s'",host,user));
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  for (uint i=0 ; i < acl_users.elements ; i++)
  {
    ACL_USER *acl_user=dynamic_element(&acl_users,i,ACL_USER*);
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    DBUG_PRINT("info",("strcmp('%s','%s'), compare_hostname('%s','%s'),",
			    user,acl_user->user,(host),(acl_user->host)));
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    if (!acl_user->user && !user[0] ||
	acl_user->user && !strcmp(user,acl_user->user))
    {
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      if (compare_hostname(&(acl_user->host),host,host))
      {
	DBUG_RETURN(acl_user);
      }
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    }
  }
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  DBUG_RETURN(0);
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}

/*****************************************************************************
	Handle comparing of hostname
	A hostname may be of type:
	hostname   (May include wildcards);   monty.pp.sci.fi
	ip	   (May include wildcards);   192.168.0.0
	ip/netmask			      192.168.0.0/255.255.255.0

	A net mask of 0.0.0.0 is not allowed.
*****************************************************************************/

static const char *calc_ip(const char *ip, long *val, char end)
{
  long ip_val,tmp;
  if (!(ip=str2int(ip,10,0,255,&ip_val)) || *ip != '.')
    return 0;
  ip_val<<=24;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != '.')
    return 0;
  ip_val+=tmp<<16;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != '.')
    return 0;
  ip_val+=tmp<<8;
  if (!(ip=str2int(ip+1,10,0,255,&tmp)) || *ip != end)
    return 0;
  *val=ip_val+tmp;
  return ip;
}


static void update_hostname(acl_host_and_ip *host, const char *hostname)
{
  host->hostname=(char*) hostname;		// This will not be modified!
  if (hostname &&
      (!(hostname=calc_ip(hostname,&host->ip,'/')) ||
       !(hostname=calc_ip(hostname+1,&host->ip_mask,'\0'))))
  {
    host->ip=host->ip_mask=0;			// Not a masked ip
  }
}


static bool compare_hostname(const acl_host_and_ip *host, const char *hostname,
			     const char *ip)
{
  long tmp;
  if (host->ip_mask && ip && calc_ip(ip,&tmp,'\0'))
  {
    return (tmp & host->ip_mask) == host->ip;
  }
  return (!host->hostname ||
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	  (hostname && !wild_case_compare(&my_charset_latin1,
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                                          hostname,host->hostname)) ||
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	  (ip && !wild_compare(ip,host->hostname,0)));
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}


/****************************************************************************
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  Code to update grants in the user and database privilege tables
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****************************************************************************/

static bool update_user_table(THD *thd, const char *host, const char *user,
			      const char *new_password)
{
  TABLE_LIST tables;
  TABLE *table;
  bool error=1;
  DBUG_ENTER("update_user_table");
  DBUG_PRINT("enter",("user: %s  host: %s",user,host));

  bzero((char*) &tables,sizeof(tables));
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  tables.alias=tables.real_name=(char*) "user";
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  tables.db=(char*) "mysql";
  if (!(table=open_ltable(thd,&tables,TL_WRITE)))
    DBUG_RETURN(1); /* purecov: deadcode */
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  table->field[0]->store(host,(uint) strlen(host), &my_charset_latin1);
  table->field[1]->store(user,(uint) strlen(user), &my_charset_latin1);
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  if (table->file->index_read_idx(table->record[0],0,
				  (byte*) table->field[0]->ptr,0,
				  HA_READ_KEY_EXACT))
  {
    my_error(ER_PASSWORD_NO_MATCH,MYF(0));	/* purecov: deadcode */
    DBUG_RETURN(1);				/* purecov: deadcode */
  }
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  store_record(table,record[1]);
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  table->field[2]->store(new_password,(uint) strlen(new_password), &my_charset_latin1);
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  if ((error=table->file->update_row(table->record[1],table->record[0])))
  {
    table->file->print_error(error,MYF(0));	/* purecov: deadcode */
    goto end;					/* purecov: deadcode */
  }
  error=0;					// Record updated

end:
  close_thread_tables(thd);
  DBUG_RETURN(error);
}

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/* Return 1 if we are allowed to create new users */

static bool test_if_create_new_users(THD *thd)
{
  bool create_new_users=1;    // Assume that we are allowed to create new users
  if (opt_safe_user_create && !(thd->master_access & INSERT_ACL))
  {
    TABLE_LIST tl;
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    ulong db_access;
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    bzero((char*) &tl,sizeof(tl));
    tl.db=	   (char*) "mysql";
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    tl.real_name=  (char*) "user";
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    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
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		      thd->priv_user, tl.db, 0);
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    if (!(db_access & INSERT_ACL))
    {
      if (check_grant(thd,INSERT_ACL,&tl,0,1))
	create_new_users=0;
    }
  }
  return create_new_users;
}


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/****************************************************************************
** Handle GRANT commands
****************************************************************************/

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static int replace_user_table(THD *thd, TABLE *table, const LEX_USER &combo,
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			      ulong rights, bool revoke_grant,
			      bool create_user)
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{
  int error = -1;
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  bool old_row_exists=0;
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  char *password,empty_string[1];
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  char what= (revoke_grant) ? 'N' : 'Y';
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  DBUG_ENTER("replace_user_table");
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  safe_mutex_assert_owner(&acl_cache->lock);
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  password=empty_string;
  empty_string[0]=0;
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  if (combo.password.str && combo.password.str[0])
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  {
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    if ((combo.password.length != HASH_PASSWORD_LENGTH)
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         && combo.password.length != HASH_OLD_PASSWORD_LENGTH)
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    {
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      my_printf_error(ER_PASSWORD_NO_MATCH,
          "Password hash should be a %d-digit hexadecimal number",
          MYF(0),HASH_PASSWORD_LENGTH);
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      DBUG_RETURN(-1);
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    }
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    password=combo.password.str;
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  }
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  table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
  table->field[1]->store(combo.user.str,combo.user.length, &my_charset_latin1);
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  table->file->index_init(0);
  if (table->file->index_read(table->record[0],
			      (byte*) table->field[0]->ptr,0,
			      HA_READ_KEY_EXACT))
  {
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    if (!create_user)
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    {
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      if (what == 'N')
	my_printf_error(ER_NONEXISTING_GRANT,ER(ER_NONEXISTING_GRANT),
			MYF(0),combo.user.str,combo.host.str);
      else
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	my_printf_error(ER_NO_PERMISSION_TO_CREATE_USER,
			ER(ER_NO_PERMISSION_TO_CREATE_USER),
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			MYF(0),thd->user,
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			thd->host_or_ip);
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      error= -1;
      goto end;
    }
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    old_row_exists = 0;
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    restore_record(table,default_values);	// cp empty row from default_values
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    table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
    table->field[1]->store(combo.user.str,combo.user.length, &my_charset_latin1);
    table->field[2]->store(password,(uint) strlen(password), &my_charset_latin1);
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  }
  else
  {
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    old_row_exists = 1;
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    store_record(table,record[1]);			// Save copy for update
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    if (combo.password.str)			// If password given
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      table->field[2]->store(password,(uint) strlen(password), &my_charset_latin1);
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  }

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  /* Update table columns with new privileges */

  Field **tmp_field;
  ulong priv;
  for (tmp_field= table->field+3, priv = SELECT_ACL;
       *tmp_field && (*tmp_field)->real_type() == FIELD_TYPE_ENUM &&
	 ((Field_enum*) (*tmp_field))->typelib->count == 2 ;
       tmp_field++, priv <<= 1)
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  {
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    if (priv & rights)				 // set requested privileges
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      (*tmp_field)->store(&what, 1, &my_charset_latin1);
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  }
  rights=get_access(table,3);
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  DBUG_PRINT("info",("table->fields: %d",table->fields));
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  if (table->fields >= 31)		/* From 4.0.0 we have more fields */
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  {
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    /* We write down SSL related ACL stuff */
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    switch (thd->lex.ssl_type) {
    case SSL_TYPE_ANY:
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      table->field[24]->store("ANY",3, &my_charset_latin1);
      table->field[25]->store("", 0, &my_charset_latin1);
      table->field[26]->store("", 0, &my_charset_latin1);
      table->field[27]->store("", 0, &my_charset_latin1);
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      break;
    case SSL_TYPE_X509:
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      table->field[24]->store("X509",4, &my_charset_latin1);
      table->field[25]->store("", 0, &my_charset_latin1);
      table->field[26]->store("", 0, &my_charset_latin1);
      table->field[27]->store("", 0, &my_charset_latin1);
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      break;
    case SSL_TYPE_SPECIFIED:
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      table->field[24]->store("SPECIFIED",9, &my_charset_latin1);
      table->field[25]->store("", 0, &my_charset_latin1);
      table->field[26]->store("", 0, &my_charset_latin1);
      table->field[27]->store("", 0, &my_charset_latin1);
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      if (thd->lex.ssl_cipher)
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	table->field[25]->store(thd->lex.ssl_cipher,
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				strlen(thd->lex.ssl_cipher), &my_charset_latin1);
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      if (thd->lex.x509_issuer)
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	table->field[26]->store(thd->lex.x509_issuer,
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				strlen(thd->lex.x509_issuer), &my_charset_latin1);
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      if (thd->lex.x509_subject)
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	table->field[27]->store(thd->lex.x509_subject,
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				strlen(thd->lex.x509_subject), &my_charset_latin1);
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      break;
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    case SSL_TYPE_NOT_SPECIFIED:
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      break;
    case SSL_TYPE_NONE:
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      table->field[24]->store("", 0, &my_charset_latin1);
      table->field[25]->store("", 0, &my_charset_latin1);
      table->field[26]->store("", 0, &my_charset_latin1);
      table->field[27]->store("", 0, &my_charset_latin1);
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      break;
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    }
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    USER_RESOURCES mqh = thd->lex.mqh;
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    if (mqh.bits & 1)
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      table->field[28]->store((longlong) mqh.questions);
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    if (mqh.bits & 2)
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      table->field[29]->store((longlong) mqh.updates);
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    if (mqh.bits & 4)
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      table->field[30]->store((longlong) mqh.connections);
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    mqh_used = mqh_used || mqh.questions || mqh.updates || mqh.connections;
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  }
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  if (old_row_exists)
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  {
    /*
      We should NEVER delete from the user table, as a uses can still
      use mysqld even if he doesn't have any privileges in the user table!
    */
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    if (cmp_record(table,record[1]) &&
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	(error=table->file->update_row(table->record[1],table->record[0])))
    {						// This should never happen
      table->file->print_error(error,MYF(0));	/* purecov: deadcode */
      error= -1;				/* purecov: deadcode */
      goto end;					/* purecov: deadcode */
    }
  }
  else if ((error=table->file->write_row(table->record[0]))) // insert
  {						// This should never happen
    if (error && error != HA_ERR_FOUND_DUPP_KEY &&
	error != HA_ERR_FOUND_DUPP_UNIQUE)	/* purecov: inspected */
    {
      table->file->print_error(error,MYF(0));	/* purecov: deadcode */
      error= -1;				/* purecov: deadcode */
      goto end;					/* purecov: deadcode */
    }
  }
  error=0;					// Privileges granted / revoked

1506
end:
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  if (!error)
  {
    acl_cache->clear(1);			// Clear privilege cache
    if (!combo.password.str)
      password=0;				// No password given on command
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    if (old_row_exists)
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      acl_update_user(combo.user.str,combo.host.str,password,
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		      thd->lex.ssl_type,
		      thd->lex.ssl_cipher,
		      thd->lex.x509_issuer,
		      thd->lex.x509_subject,
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		      &thd->lex.mqh,
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		      rights);
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    else
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      acl_insert_user(combo.user.str,combo.host.str,password,
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		      thd->lex.ssl_type,
		      thd->lex.ssl_cipher,
		      thd->lex.x509_issuer,
		      thd->lex.x509_subject,
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		      &thd->lex.mqh,
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		      rights);
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  }
  table->file->index_end();
  DBUG_RETURN(error);
}


/*
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  change grants in the mysql.db table
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*/

static int replace_db_table(TABLE *table, const char *db,
			    const LEX_USER &combo,
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			    ulong rights, bool revoke_grant)
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{
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  uint i;
  ulong priv,store_rights;
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  bool old_row_exists=0;
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  int error;
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  char what= (revoke_grant) ? 'N' : 'Y';
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  DBUG_ENTER("replace_db_table");

  // is there such a user in user table in memory ????
  if (!initialized || !find_acl_user(combo.host.str,combo.user.str))
  {
    my_error(ER_PASSWORD_NO_MATCH,MYF(0));
    DBUG_RETURN(-1);
  }

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  table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
  table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
  table->field[2]->store(combo.user.str,combo.user.length, &my_charset_latin1);
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  table->file->index_init(0);
  if (table->file->index_read(table->record[0],(byte*) table->field[0]->ptr,0,
	      HA_READ_KEY_EXACT))
  {
    if (what == 'N')
    { // no row, no revoke
      my_printf_error(ER_NONEXISTING_GRANT,ER(ER_NONEXISTING_GRANT),MYF(0),
		      combo.user.str,combo.host.str);
      goto abort;
    }
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    old_row_exists = 0;
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    restore_record(table,default_values);			// cp empty row from default_values
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    table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
    table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
    table->field[2]->store(combo.user.str,combo.user.length, &my_charset_latin1);
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  }
  else
  {
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    old_row_exists = 1;
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    store_record(table,record[1]);
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  }

  store_rights=get_rights_for_db(rights);
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  for (i= 3, priv= 1; i < table->fields; i++, priv <<= 1)
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  {
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    if (priv & store_rights)			// do it if priv is chosen
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      table->field [i]->store(&what,1, &my_charset_latin1);// set requested privileges
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  }
  rights=get_access(table,3);
  rights=fix_rights_for_db(rights);

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  if (old_row_exists)
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  {
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    // update old existing row
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    if (rights)
    {
      if ((error=table->file->update_row(table->record[1],table->record[0])))
	goto table_error;			/* purecov: deadcode */
    }
    else	/* must have been a revoke of all privileges */
    {
      if ((error = table->file->delete_row(table->record[1])))
	goto table_error;			/* purecov: deadcode */
    }
  }
  else if ((error=table->file->write_row(table->record[0])))
  {
    if (error && error != HA_ERR_FOUND_DUPP_KEY) /* purecov: inspected */
      goto table_error; /* purecov: deadcode */
  }

  acl_cache->clear(1);				// Clear privilege cache
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  if (old_row_exists)
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    acl_update_db(combo.user.str,combo.host.str,db,rights);
  else
    acl_insert_db(combo.user.str,combo.host.str,db,rights);
  table->file->index_end();
  DBUG_RETURN(0);

  /* This could only happen if the grant tables got corrupted */
 table_error:
  table->file->print_error(error,MYF(0));	/* purecov: deadcode */
  table->file->index_end();

 abort:
  DBUG_RETURN(-1);
}


class GRANT_COLUMN :public Sql_alloc
{
public:
  char *column;
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  ulong rights;
  uint key_length;
  GRANT_COLUMN(String &c,  ulong y) :rights (y)
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  {
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    column= memdup_root(&memex,c.ptr(), key_length=c.length());
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  }
};

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static byte* get_key_column(GRANT_COLUMN *buff,uint *length,
			    my_bool not_used __attribute__((unused)))
{
  *length=buff->key_length;
  return (byte*) buff->column;
}

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class GRANT_TABLE :public Sql_alloc
{
public:
  char *host,*db,*user,*tname, *hash_key;
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  ulong privs, cols;
  uint key_length;
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  HASH hash_columns;
  GRANT_TABLE (const char *h, const char *d,const char *u, const char *t,
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	       ulong p, ulong c)
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    : privs(p), cols(c)
  {
    host = strdup_root(&memex,h);
    db =   strdup_root(&memex,d);
    user = strdup_root(&memex,u);
    tname= strdup_root(&memex,t);
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    if (lower_case_table_names)
    {
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      my_casedn_str(&my_charset_latin1, db);
      my_casedn_str(&my_charset_latin1, tname);
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    }
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    key_length =(uint) strlen(d)+(uint) strlen(u)+(uint) strlen(t)+3;
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    hash_key = (char*) alloc_root(&memex,key_length);
    strmov(strmov(strmov(hash_key,user)+1,db)+1,tname);
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    (void) hash_init(&hash_columns,&my_charset_latin1,
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		     0,0,0, (hash_get_key) get_key_column,0,0);
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  }

  GRANT_TABLE (TABLE *form, TABLE *col_privs)
  {
    byte key[MAX_KEY_LENGTH];

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    host =  get_field(&memex,form->field[0]);
    db =    get_field(&memex,form->field[1]);
    user =  get_field(&memex,form->field[2]);
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    if (!user)
      user=(char*) "";
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    tname = get_field(&memex,form->field[3]);
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    if (!host || !db || !tname)
    {
      /* Wrong table row; Ignore it */
      privs = cols = 0;				/* purecov: inspected */
      return;					/* purecov: inspected */
    }
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    if (lower_case_table_names)
    {
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      my_casedn_str(&my_charset_latin1, db);
      my_casedn_str(&my_charset_latin1, tname);
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    }
    key_length = ((uint) strlen(db) + (uint) strlen(user) +
		  (uint) strlen(tname) + 3);
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    hash_key = (char*) alloc_root(&memex,key_length);
    strmov(strmov(strmov(hash_key,user)+1,db)+1,tname);
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    privs = (ulong) form->field[6]->val_int();
    cols  = (ulong) form->field[7]->val_int();
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    privs = fix_rights_for_table(privs);
    cols =  fix_rights_for_column(cols);

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    (void) hash_init(&hash_columns,&my_charset_latin1,
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		     0,0,0, (hash_get_key) get_key_column,0,0);
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    if (cols)
    {
      int key_len;
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      col_privs->field[0]->store(host,(uint) strlen(host), &my_charset_latin1);
      col_privs->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
      col_privs->field[2]->store(user,(uint) strlen(user), &my_charset_latin1);
      col_privs->field[3]->store(tname,(uint) strlen(tname), &my_charset_latin1);
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      key_len=(col_privs->field[0]->pack_length()+
	       col_privs->field[1]->pack_length()+
	       col_privs->field[2]->pack_length()+
	       col_privs->field[3]->pack_length());
      key_copy(key,col_privs,0,key_len);
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      col_privs->field[4]->store("",0, &my_charset_latin1);
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      col_privs->file->index_init(0);
      if (col_privs->file->index_read(col_privs->record[0],
				      (byte*) col_privs->field[0]->ptr,
				      key_len, HA_READ_KEY_EXACT))
      {
	cols = 0; /* purecov: deadcode */
	return;
      }
      do
      {
	String *res,column_name;
	GRANT_COLUMN *mem_check;
	/* As column name is a string, we don't have to supply a buffer */
	res=col_privs->field[4]->val_str(&column_name,&column_name);
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	ulong priv= (ulong) col_privs->field[6]->val_int();
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	if (!(mem_check = new GRANT_COLUMN(*res,
					   fix_rights_for_column(priv))))
	{
	  // Don't use this entry
	  privs = cols = 0;			/* purecov: deadcode */
	  return;				/* purecov: deadcode */
	}
	hash_insert(&hash_columns, (byte *) mem_check);
      } while (!col_privs->file->index_next(col_privs->record[0]) &&
	       !key_cmp(col_privs,key,0,key_len));
    }
  }
  bool ok() { return privs != 0 || cols != 0; }
};

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static byte* get_grant_table(GRANT_TABLE *buff,uint *length,
			     my_bool not_used __attribute__((unused)))
{
  *length=buff->key_length;
  return (byte*) buff->hash_key;
}

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void free_grant_table(GRANT_TABLE *grant_table)
{
  hash_free(&grant_table->hash_columns);
}

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/* Search after a matching grant. Prefer exact grants before not exact ones */

static GRANT_TABLE *table_hash_search(const char *host,const char* ip,
				      const char *db,
				      const char *user, const char *tname,
				      bool exact)
{
  char helping [NAME_LEN*2+USERNAME_LENGTH+3];
  uint len;
  GRANT_TABLE *grant_table,*found=0;

  len  = (uint) (strmov(strmov(strmov(helping,user)+1,db)+1,tname)-helping)+ 1;
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  for (grant_table=(GRANT_TABLE*) hash_search(&column_priv_hash,
					      (byte*) helping,
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					      len) ;
       grant_table ;
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       grant_table= (GRANT_TABLE*) hash_next(&column_priv_hash,(byte*) helping,
					     len))
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  {
    if (exact)
    {
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      if ((host &&
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	   !my_strcasecmp(&my_charset_latin1, host, grant_table->host)) ||
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	  (ip && !strcmp(ip,grant_table->host)))
	return grant_table;
    }
    else
    {
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      if ((host && !wild_case_compare(&my_charset_latin1,
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                                      host,grant_table->host)) ||
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	  (ip && !wild_case_compare(&my_charset_latin1,
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                                    ip,grant_table->host)))
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	found=grant_table;					// Host ok
    }
  }
  return found;
}



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inline GRANT_COLUMN *
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column_hash_search(GRANT_TABLE *t, const char *cname, uint length)
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{
  return (GRANT_COLUMN*) hash_search(&t->hash_columns, (byte*) cname,length);
}


static int replace_column_table(GRANT_TABLE *g_t,
				TABLE *table, const LEX_USER &combo,
				List <LEX_COLUMN> &columns,
				const char *db, const char *table_name,
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				ulong rights, bool revoke_grant)
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{
  int error=0,result=0;
  uint key_length;
  byte key[MAX_KEY_LENGTH];
  DBUG_ENTER("replace_column_table");

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  table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
  table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
  table->field[2]->store(combo.user.str,combo.user.length, &my_charset_latin1);
  table->field[3]->store(table_name,(uint) strlen(table_name), &my_charset_latin1);
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  key_length=(table->field[0]->pack_length()+ table->field[1]->pack_length()+
	      table->field[2]->pack_length()+ table->field[3]->pack_length());
  key_copy(key,table,0,key_length);

  rights &= COL_ACLS;				// Only ACL for columns

  /* first fix privileges for all columns in column list */

  List_iterator <LEX_COLUMN> iter(columns);
  class LEX_COLUMN *xx;
  table->file->index_init(0);
  while ((xx=iter++))
  {
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    ulong privileges = xx->rights;
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    bool old_row_exists=0;
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    key_restore(table,key,0,key_length);
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    table->field[4]->store(xx->column.ptr(),xx->column.length(),&my_charset_latin1);
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    if (table->file->index_read(table->record[0],(byte*) table->field[0]->ptr,
				0, HA_READ_KEY_EXACT))
    {
      if (revoke_grant)
      {
	my_printf_error(ER_NONEXISTING_TABLE_GRANT,
			ER(ER_NONEXISTING_TABLE_GRANT),MYF(0),
			combo.user.str, combo.host.str,table_name); /* purecov: inspected */
	result= -1; /* purecov: inspected */
	continue; /* purecov: inspected */
      }
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      old_row_exists = 0;
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      restore_record(table,default_values);				// Get empty record
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      key_restore(table,key,0,key_length);
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      table->field[4]->store(xx->column.ptr(),xx->column.length(), &my_charset_latin1);
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    }
    else
    {
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      ulong tmp= (ulong) table->field[6]->val_int();
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      tmp=fix_rights_for_column(tmp);

      if (revoke_grant)
	privileges = tmp & ~(privileges | rights);
      else
	privileges |= tmp;
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      old_row_exists = 1;
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      store_record(table,record[1]);			// copy original row
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    }

    table->field[6]->store((longlong) get_rights_for_column(privileges));

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    if (old_row_exists)
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    {
      if (privileges)
	error=table->file->update_row(table->record[1],table->record[0]);
      else
	error=table->file->delete_row(table->record[1]);
      if (error)
      {
	table->file->print_error(error,MYF(0)); /* purecov: inspected */
	result= -1;				/* purecov: inspected */
	goto end;				/* purecov: inspected */
      }
      GRANT_COLUMN *grant_column = column_hash_search(g_t,
						      xx->column.ptr(),
						      xx->column.length());
      if (grant_column)				// Should always be true
	grant_column->rights = privileges;	// Update hash
    }
    else					// new grant
    {
      if ((error=table->file->write_row(table->record[0])))
      {
	table->file->print_error(error,MYF(0)); /* purecov: inspected */
	result= -1;				/* purecov: inspected */
	goto end;				/* purecov: inspected */
      }
      GRANT_COLUMN *grant_column = new GRANT_COLUMN(xx->column,privileges);
      hash_insert(&g_t->hash_columns,(byte*) grant_column);
    }
  }
  table->file->index_end();

  /*
    If revoke of privileges on the table level, remove all such privileges
    for all columns
  */

  if (revoke_grant)
  {
    table->file->index_init(0);
    if (table->file->index_read(table->record[0], (byte*) table->field[0]->ptr,
				key_length, HA_READ_KEY_EXACT))
      goto end;

    // Scan trough all rows with the same host,db,user and table
    do
    {
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      ulong privileges = (ulong) table->field[6]->val_int();
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      privileges=fix_rights_for_column(privileges);
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      store_record(table,record[1]);
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      if (privileges & rights)	// is in this record the priv to be revoked ??
      {
	GRANT_COLUMN *grant_column = NULL;
	char  colum_name_buf[HOSTNAME_LENGTH+1];
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	String column_name(colum_name_buf,sizeof(colum_name_buf),&my_charset_latin1);
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	privileges&= ~rights;
	table->field[6]->store((longlong)
			       get_rights_for_column(privileges));
	table->field[4]->val_str(&column_name,&column_name);
	grant_column = column_hash_search(g_t,
					  column_name.ptr(),
					  column_name.length());
	if (privileges)
	{
	  int tmp_error;
	  if ((tmp_error=table->file->update_row(table->record[1],
						 table->record[0])))
	  {					/* purecov: deadcode */
	    table->file->print_error(tmp_error,MYF(0)); /* purecov: deadcode */
	    result= -1;				/* purecov: deadcode */
	    goto end;				/* purecov: deadcode */
	  }
	  if (grant_column)
	    grant_column->rights  = privileges; // Update hash
	}
	else
	{
	  int tmp_error;
	  if ((tmp_error = table->file->delete_row(table->record[1])))
	  {					/* purecov: deadcode */
	    table->file->print_error(tmp_error,MYF(0)); /* purecov: deadcode */
	    result= -1;				/* purecov: deadcode */
	    goto end;				/* purecov: deadcode */
	  }
	  if (grant_column)
	    hash_delete(&g_t->hash_columns,(byte*) grant_column);
	}
      }
    } while (!table->file->index_next(table->record[0]) &&
	     !key_cmp(table,key,0,key_length));
  }

 end:
  table->file->index_end();
  DBUG_RETURN(result);
}


static int replace_table_table(THD *thd, GRANT_TABLE *grant_table,
			       TABLE *table, const LEX_USER &combo,
			       const char *db, const char *table_name,
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			       ulong rights, ulong col_rights,
			       bool revoke_grant)
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{
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  char grantor[HOSTNAME_LENGTH+USERNAME_LENGTH+2];
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  int old_row_exists = 1;
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  int error=0;
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  ulong store_table_rights, store_col_rights;
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  DBUG_ENTER("replace_table_table");

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  strxmov(grantor, thd->user, "@", thd->host_or_ip, NullS);
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  /*
    The following should always succeed as new users are created before
    this function is called!
  */
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  if (!find_acl_user(combo.host.str,combo.user.str))
  {
    my_error(ER_PASSWORD_NO_MATCH,MYF(0));	/* purecov: deadcode */
    DBUG_RETURN(-1);				/* purecov: deadcode */
  }

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  restore_record(table,default_values);			// Get empty record
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  table->field[0]->store(combo.host.str,combo.host.length, &my_charset_latin1);
  table->field[1]->store(db,(uint) strlen(db), &my_charset_latin1);
  table->field[2]->store(combo.user.str,combo.user.length, &my_charset_latin1);
  table->field[3]->store(table_name,(uint) strlen(table_name), &my_charset_latin1);
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  store_record(table,record[1]);			// store at pos 1
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  if (table->file->index_read_idx(table->record[0],0,
				  (byte*) table->field[0]->ptr,0,
				  HA_READ_KEY_EXACT))
  {
    /*
      The following should never happen as we first check the in memory
      grant tables for the user.  There is however always a small change that
      the user has modified the grant tables directly.
    */
    if (revoke_grant)
    { // no row, no revoke
      my_printf_error(ER_NONEXISTING_TABLE_GRANT,
		      ER(ER_NONEXISTING_TABLE_GRANT),MYF(0),
		      combo.user.str,combo.host.str,
		      table_name);		/* purecov: deadcode */
      DBUG_RETURN(-1);				/* purecov: deadcode */
    }
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    old_row_exists = 0;
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    restore_record(table,record[1]);			// Get saved record
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  }

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  store_table_rights= get_rights_for_table(rights);
  store_col_rights=   get_rights_for_column(col_rights);
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  if (old_row_exists)
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  {
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    ulong j,k;
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    store_record(table,record[1]);
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    j = (ulong) table->field[6]->val_int();
    k = (ulong) table->field[7]->val_int();
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    if (revoke_grant)
    {
      // column rights are already fixed in mysql_table_grant !
      store_table_rights=j & ~store_table_rights;
    }
    else
    {
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      store_table_rights|= j;
      store_col_rights|=   k;
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    }
  }

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  table->field[4]->store(grantor,(uint) strlen(grantor), &my_charset_latin1);
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  table->field[6]->store((longlong) store_table_rights);
  table->field[7]->store((longlong) store_col_rights);
  rights=fix_rights_for_table(store_table_rights);
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  col_rights=fix_rights_for_column(store_col_rights);
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  if (old_row_exists)
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  {
    if (store_table_rights || store_col_rights)
    {
      if ((error=table->file->update_row(table->record[1],table->record[0])))
	goto table_error;			/* purecov: deadcode */
    }
    else if ((error = table->file->delete_row(table->record[1])))
      goto table_error;				/* purecov: deadcode */
  }
  else
  {
    error=table->file->write_row(table->record[0]);
    if (error && error != HA_ERR_FOUND_DUPP_KEY)
      goto table_error;				/* purecov: deadcode */
  }

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  if (rights | col_rights)
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  {
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    grant_table->privs= rights;
    grant_table->cols=  col_rights;
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  }
  else
  {
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    hash_delete(&column_priv_hash,(byte*) grant_table);
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  }
  DBUG_RETURN(0);

 /* This should never happen */
 table_error:
  table->file->print_error(error,MYF(0)); /* purecov: deadcode */
  DBUG_RETURN(-1); /* purecov: deadcode */
}


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int mysql_table_grant(THD *thd, TABLE_LIST *table_list,
		      List <LEX_USER> &user_list,
		      List <LEX_COLUMN> &columns, ulong rights,
		      bool revoke_grant)
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{
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  ulong column_priv = 0;
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  List_iterator <LEX_USER> str_list (user_list);
  LEX_USER *Str;
  TABLE_LIST tables[3];
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  bool create_new_users=0;
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  DBUG_ENTER("mysql_table_grant");

  if (!initialized)
  {
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    send_error(thd, ER_UNKNOWN_COM_ERROR);	/* purecov: inspected */
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    return 1;					/* purecov: inspected */
  }
  if (rights & ~TABLE_ACLS)
  {
    my_error(ER_ILLEGAL_GRANT_FOR_TABLE,MYF(0));
    DBUG_RETURN(-1);
  }

  if (columns.elements && !revoke_grant)
  {
    TABLE *table;
    class LEX_COLUMN *check;
    List_iterator <LEX_COLUMN> iter(columns);

    if (!(table=open_ltable(thd,table_list,TL_READ)))
      DBUG_RETURN(-1);
    while ((check = iter++))
    {
      if (!find_field_in_table(thd,table,check->column.ptr(),
			       check->column.length(),0,0))
      {
	my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
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			check->column.c_ptr(), table_list->alias);
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	DBUG_RETURN(-1);
      }
      column_priv |= check->rights | (rights & COL_ACLS);
    }
    close_thread_tables(thd);
  }
  else if (!(rights & CREATE_ACL) && !revoke_grant)
  {
    char buf[FN_REFLEN];
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    sprintf(buf,"%s/%s/%s.frm",mysql_data_home, table_list->db,
	    table_list->real_name);
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    fn_format(buf,buf,"","",4+16+32);
    if (access(buf,F_OK))
    {
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      my_error(ER_NO_SUCH_TABLE,MYF(0),table_list->db, table_list->alias);
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      DBUG_RETURN(-1);
    }
  }

  /* open the mysql.tables_priv and mysql.columns_priv tables */

  bzero((char*) &tables,sizeof(tables));
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  tables[0].alias=tables[0].real_name= (char*) "user";
  tables[1].alias=tables[1].real_name= (char*) "tables_priv";
  tables[2].alias=tables[2].real_name= (char*) "columns_priv";
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  tables[0].next=tables+1;
  /* Don't open column table if we don't need it ! */
  tables[1].next=((column_priv ||
		   (revoke_grant && ((rights & COL_ACLS) || columns.elements)))
		  ? tables+2 : 0);
  tables[0].lock_type=tables[1].lock_type=tables[2].lock_type=TL_WRITE;
  tables[0].db=tables[1].db=tables[2].db=(char*) "mysql";

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#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
  if (thd->slave_thread && table_rules_on && !tables_ok(0, tables))
    DBUG_RETURN(0);
#endif

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  if (open_and_lock_tables(thd,tables))
  {						// Should never happen
    close_thread_tables(thd);			/* purecov: deadcode */
    DBUG_RETURN(-1);				/* purecov: deadcode */
  }

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  if (!revoke_grant)
    create_new_users= test_if_create_new_users(thd);
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  int result=0;
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  rw_wrlock(&LOCK_grant);
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  MEM_ROOT *old_root=my_pthread_getspecific_ptr(MEM_ROOT*,THR_MALLOC);
  my_pthread_setspecific_ptr(THR_MALLOC,&memex);

  while ((Str = str_list++))
  {
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    int error;
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    GRANT_TABLE *grant_table;
    if (Str->host.length > HOSTNAME_LENGTH ||
	Str->user.length > USERNAME_LENGTH)
    {
      my_error(ER_GRANT_WRONG_HOST_OR_USER,MYF(0));
      result= -1;
      continue;
    }
    /* Create user if needed */
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    pthread_mutex_lock(&acl_cache->lock);
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    error=replace_user_table(thd, tables[0].table, *Str,
			     0, revoke_grant, create_new_users);
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    pthread_mutex_unlock(&acl_cache->lock);
    if (error)
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    {
      result= -1;				// Remember error
      continue;					// Add next user
    }

    /* Find/create cached table grant */
    grant_table= table_hash_search(Str->host.str,NullS,table_list->db,
				   Str->user.str,
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				   table_list->real_name,1);
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    if (!grant_table)
    {
      if (revoke_grant)
      {
	my_printf_error(ER_NONEXISTING_TABLE_GRANT,
			ER(ER_NONEXISTING_TABLE_GRANT),MYF(0),
2216
			Str->user.str, Str->host.str, table_list->real_name);
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	result= -1;
	continue;
      }
      grant_table = new GRANT_TABLE (Str->host.str,table_list->db,
				     Str->user.str,
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				     table_list->real_name,
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				     rights,
				     column_priv);
      if (!grant_table)				// end of memory
      {
	result= -1;				/* purecov: deadcode */
	continue;				/* purecov: deadcode */
      }
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      hash_insert(&column_priv_hash,(byte*) grant_table);
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    }

    /* If revoke_grant, calculate the new column privilege for tables_priv */
    if (revoke_grant)
    {
      class LEX_COLUMN *check;
      List_iterator <LEX_COLUMN> iter(columns);
      GRANT_COLUMN *grant_column;

      /* Fix old grants */
      while ((check = iter++))
      {
	grant_column = column_hash_search(grant_table,
					  check->column.ptr(),
					  check->column.length());
	if (grant_column)
	  grant_column->rights&= ~(check->rights | rights);
      }
      /* scan trough all columns to get new column grant */
      column_priv=0;
      for (uint idx=0 ; idx < grant_table->hash_columns.records ; idx++)
      {
	grant_column= (GRANT_COLUMN*) hash_element(&grant_table->hash_columns,
						   idx);
	grant_column->rights&= ~rights;		// Fix other columns
	column_priv|= grant_column->rights;
      }
    }
    else
    {
      column_priv|= grant_table->cols;
    }


    /* update table and columns */

    if (replace_table_table(thd,grant_table,tables[1].table,*Str,
			    table_list->db,
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			    table_list->real_name,
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			    rights, column_priv, revoke_grant))
    {						// Crashend table ??
      result= -1;			       /* purecov: deadcode */
    }
    else if (tables[2].table)
    {
      if ((replace_column_table(grant_table,tables[2].table, *Str,
				columns,
				table_list->db,
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				table_list->real_name,
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				rights, revoke_grant)))
      {
	result= -1;
      }
    }
  }
  grant_option=TRUE;
  my_pthread_setspecific_ptr(THR_MALLOC,old_root);
2288
  rw_unlock(&LOCK_grant);
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  if (!result)
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    send_ok(thd);
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  /* Tables are automatically closed */
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  DBUG_RETURN(result);
}


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int mysql_grant (THD *thd, const char *db, List <LEX_USER> &list,
		 ulong rights, bool revoke_grant)
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{
  List_iterator <LEX_USER> str_list (list);
  LEX_USER *Str;
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  char tmp_db[NAME_LEN+1];
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  bool create_new_users=0;
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  TABLE_LIST tables[2];
  DBUG_ENTER("mysql_grant");
  if (!initialized)
  {
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    send_error(thd, ER_UNKNOWN_COM_ERROR);	/* purecov: tested */
    return 1;					/* purecov: tested */
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  }

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  if (lower_case_table_names && db)
  {
    strmov(tmp_db,db);
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    my_casedn_str(&my_charset_latin1, tmp_db);
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    db=tmp_db;
  }
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  /* open the mysql.user and mysql.db tables */

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  tables[0].alias=tables[0].real_name=(char*) "user";
  tables[1].alias=tables[1].real_name=(char*) "db";
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  tables[0].next=tables+1;
  tables[1].next=0;
  tables[0].lock_type=tables[1].lock_type=TL_WRITE;
  tables[0].db=tables[1].db=(char*) "mysql";
  tables[0].table=tables[1].table=0;
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#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
  if (thd->slave_thread && table_rules_on && !tables_ok(0, tables))
    DBUG_RETURN(0);
#endif

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  if (open_and_lock_tables(thd,tables))
  {						// This should never happen
    close_thread_tables(thd);			/* purecov: deadcode */
    DBUG_RETURN(-1);				/* purecov: deadcode */
  }

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  if (!revoke_grant)
    create_new_users= test_if_create_new_users(thd);
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  // go through users in user_list
2347
  rw_wrlock(&LOCK_grant);
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  VOID(pthread_mutex_lock(&acl_cache->lock));
  grant_version++;

  int result=0;
  while ((Str = str_list++))
  {
    if (Str->host.length > HOSTNAME_LENGTH ||
	Str->user.length > USERNAME_LENGTH)
    {
      my_error(ER_GRANT_WRONG_HOST_OR_USER,MYF(0));
      result= -1;
      continue;
    }
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    if ((replace_user_table(thd,
		            tables[0].table,
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			    *Str,
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			    (!db ? rights : 0), revoke_grant,
			    create_new_users)))
2366
      result= -1;
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    else
    {
      if (db && replace_db_table(tables[1].table, db, *Str, rights & DB_ACLS,
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				 revoke_grant))
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	result= -1;
    }
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  }
  VOID(pthread_mutex_unlock(&acl_cache->lock));
2375
  rw_unlock(&LOCK_grant);
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  close_thread_tables(thd);

  if (!result)
2379
    send_ok(thd);
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  DBUG_RETURN(result);
}

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/* Free grant array if possible */
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void  grant_free(void)
{
  DBUG_ENTER("grant_free");
  grant_option = FALSE;
2390
  hash_free(&column_priv_hash);
2391
  free_root(&memex,MYF(0));
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  DBUG_VOID_RETURN;
}


/* Init grant array if possible */

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my_bool grant_init(THD *org_thd)
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{
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  THD  *thd;
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  TABLE_LIST tables[2];
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  MYSQL_LOCK *lock;
  my_bool return_val= 1;
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  TABLE *t_table, *c_table;
  DBUG_ENTER("grant_init");

  grant_option = FALSE;
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  (void) hash_init(&column_priv_hash,&my_charset_latin1,
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		   0,0,0, (hash_get_key) get_grant_table,
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		   (hash_free_key) free_grant_table,0);
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  init_sql_alloc(&memex,1024,0);
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  /* Don't do anything if running with --skip-grant */
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  if (!initialized)
    DBUG_RETURN(0);				/* purecov: tested */
2416

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  if (!(thd=new THD))
    DBUG_RETURN(1);				/* purecov: deadcode */
2419
  thd->store_globals();
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  thd->db= my_strdup("mysql",MYF(0));
  thd->db_length=5;				// Safety
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  bzero((char*) &tables,sizeof(tables));
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  tables[0].alias=tables[0].real_name= (char*) "tables_priv";
  tables[1].alias=tables[1].real_name= (char*) "columns_priv";
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  tables[0].next=tables+1;
  tables[0].lock_type=tables[1].lock_type=TL_READ;
  tables[0].db=tables[1].db=thd->db;

  if (open_tables(thd,tables))
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    goto end;

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  TABLE *ptr[2];				// Lock tables for quick update
  ptr[0]= tables[0].table;
  ptr[1]= tables[1].table;
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  if (!(lock=mysql_lock_tables(thd,ptr,2)))
    goto end;
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  t_table = tables[0].table; c_table = tables[1].table;
  t_table->file->index_init(0);
  if (t_table->file->index_first(t_table->record[0]))
  {
    t_table->file->index_end();
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    return_val= 0;
2444
    goto end_unlock;
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  }
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  grant_option= TRUE;
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  t_table->file->index_end();

2449
  /* Will be restored by org_thd->store_globals() */
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  my_pthread_setspecific_ptr(THR_MALLOC,&memex);
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  do
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  {
    GRANT_TABLE *mem_check;
    if (!(mem_check=new GRANT_TABLE(t_table,c_table)) ||
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	mem_check->ok() && hash_insert(&column_priv_hash,(byte*) mem_check))
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    {
      /* This could only happen if we are out memory */
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      grant_option= FALSE;			/* purecov: deadcode */
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      goto end_unlock;
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    }
  }
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  while (!t_table->file->index_next(t_table->record[0]));

  return_val=0;					// Return ok

end_unlock:
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  mysql_unlock_tables(thd, lock);
  thd->version--;				// Force close to free memory
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end:
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  close_thread_tables(thd);
  delete thd;
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  if (org_thd)
    org_thd->store_globals();
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  else
  {
    /* Remember that we don't have a THD */
    my_pthread_setspecific_ptr(THR_THD,  0);
  }
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  DBUG_RETURN(return_val);
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}


2484
/* Reload grant array (table and column privileges) if possible */
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void grant_reload(THD *thd)
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{
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  HASH old_column_priv_hash;
  bool old_grant_option;
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  MEM_ROOT old_mem;
  DBUG_ENTER("grant_reload");

  // Locked tables are checked by acl_init and doesn't have to be checked here

2495
  rw_wrlock(&LOCK_grant);
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  grant_version++;
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  old_column_priv_hash= column_priv_hash;
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  old_grant_option= grant_option;
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  old_mem= memex;
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  if (grant_init(thd))
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  {						// Error. Revert to old hash
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    DBUG_PRINT("error",("Reverting to old privileges"));
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    grant_free();				/* purecov: deadcode */
2505
    column_priv_hash= old_column_priv_hash;	/* purecov: deadcode */
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    grant_option= old_grant_option;		/* purecov: deadcode */
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    memex= old_mem;				/* purecov: deadcode */
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  }
  else
  {
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    hash_free(&old_column_priv_hash);
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    free_root(&old_mem,MYF(0));
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  }
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  rw_unlock(&LOCK_grant);
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  DBUG_VOID_RETURN;
}


/****************************************************************************
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  Check grants
  All errors are written directly to the client if command name is given !
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****************************************************************************/

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bool check_grant(THD *thd, ulong want_access, TABLE_LIST *tables,
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		 uint show_table, bool no_errors)
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{
  TABLE_LIST *table;
  char *user = thd->priv_user;

  want_access &= ~thd->master_access;
  if (!want_access)
    return 0;					// ok

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  rw_rdlock(&LOCK_grant);
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  for (table=tables; table ;table=table->next)
  {
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    if (!(~table->grant.privilege & want_access) || table->derived)
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    {
      table->grant.want_privilege=0;
      continue;					// Already checked
    }
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    GRANT_TABLE *grant_table = table_hash_search(thd->host,thd->ip,
						 table->db,user,
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						 table->real_name,0);
    if (!grant_table)
    {
      want_access &= ~table->grant.privilege;
      goto err;					// No grants
    }
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    if (show_table)
      continue;					// We have some priv on this
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    table->grant.grant_table=grant_table;	// Remember for column test
    table->grant.version=grant_version;
    table->grant.privilege|= grant_table->privs;
    table->grant.want_privilege= ((want_access & COL_ACLS)
				  & ~table->grant.privilege);

    if (!(~table->grant.privilege & want_access))
      continue;

    if (want_access & ~(grant_table->cols | table->grant.privilege))
    {
      want_access &= ~(grant_table->cols | table->grant.privilege);
      goto err;					// impossible
    }
  }
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  rw_unlock(&LOCK_grant);
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  return 0;

 err:
2572
  rw_unlock(&LOCK_grant);
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  if (!no_errors)				// Not a silent skip of table
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  {
    const char *command="";
    if (want_access & SELECT_ACL)
       command ="select";
    else if (want_access & INSERT_ACL)
      command = "insert";
    else if (want_access & UPDATE_ACL)
      command = "update";
    else if (want_access & DELETE_ACL)
      command = "delete";
    else if (want_access & DROP_ACL)
      command = "drop";
    else if (want_access & CREATE_ACL)
      command = "create";
    else if (want_access & ALTER_ACL)
      command = "alter";
    else if (want_access & INDEX_ACL)
      command = "index";
    else if (want_access & GRANT_ACL)
      command = "grant";
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    net_printf(thd,ER_TABLEACCESS_DENIED_ERROR,
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	       command,
	       thd->priv_user,
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	       thd->host_or_ip,
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	       table ? table->real_name : "unknown");
  }
  return 1;
}


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bool check_grant_column(THD *thd,TABLE *table, const char *name,
			uint length, uint show_tables)
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{
  GRANT_TABLE *grant_table;
  GRANT_COLUMN *grant_column;

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  ulong want_access=table->grant.want_privilege;
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  if (!want_access)
    return 0;					// Already checked

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  rw_rdlock(&LOCK_grant);
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  // reload table if someone has modified any grants

  if (table->grant.version != grant_version)
  {
    table->grant.grant_table=
      table_hash_search(thd->host,thd->ip,thd->db,
			thd->priv_user,
			table->real_name,0);	/* purecov: inspected */
    table->grant.version=grant_version;		/* purecov: inspected */
  }
  if (!(grant_table=table->grant.grant_table))
    goto err;					/* purecov: deadcode */

  grant_column=column_hash_search(grant_table, name, length);
  if (grant_column && !(~grant_column->rights & want_access))
  {
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    rw_unlock(&LOCK_grant);
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    return 0;
  }
#ifdef NOT_USED
  if (show_tables && (grant_column || table->grant.privilege & COL_ACLS))
  {
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    rw_unlock(&LOCK_grant);			/* purecov: deadcode */
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    return 0;					/* purecov: deadcode */
  }
#endif

  /* We must use my_printf_error() here! */
 err:
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  rw_unlock(&LOCK_grant);
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  if (!show_tables)
  {
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    char command[128];
    get_privilege_desc(command, sizeof(command), want_access);
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    my_printf_error(ER_COLUMNACCESS_DENIED_ERROR,
		    ER(ER_COLUMNACCESS_DENIED_ERROR),
		    MYF(0),
		    command,
		    thd->priv_user,
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		    thd->host_or_ip,
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		    name,
		    table ? table->real_name : "unknown");
  }
  return 1;
}


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bool check_grant_all_columns(THD *thd, ulong want_access, TABLE *table)
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{
  GRANT_TABLE *grant_table;
  GRANT_COLUMN *grant_column;
  Field *field=0,**ptr;

  want_access &= ~table->grant.privilege;
  if (!want_access)
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    return 0;				// Already checked
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  if (!grant_option)
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  {
    field= table->field[0];		// To give a meaningful error message
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    goto err2;
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  }
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  rw_rdlock(&LOCK_grant);
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  // reload table if someone has modified any grants

  if (table->grant.version != grant_version)
  {
    table->grant.grant_table=
      table_hash_search(thd->host,thd->ip,thd->db,
			thd->priv_user,
			table->real_name,0);	/* purecov: inspected */
    table->grant.version=grant_version;		/* purecov: inspected */
  }
  // The following should always be true
  if (!(grant_table=table->grant.grant_table))
    goto err;					/* purecov: inspected */

  for (ptr=table->field; (field= *ptr) ; ptr++)
  {
    grant_column=column_hash_search(grant_table, field->field_name,
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				    (uint) strlen(field->field_name));
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    if (!grant_column || (~grant_column->rights & want_access))
      goto err;
  }
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  rw_unlock(&LOCK_grant);
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  return 0;

  /* We must use my_printf_error() here! */
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err:
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  rw_unlock(&LOCK_grant);
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err2:
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  const char *command="";
  if (want_access & SELECT_ACL)
    command ="select";
  else if (want_access & INSERT_ACL)
    command = "insert";
  my_printf_error(ER_COLUMNACCESS_DENIED_ERROR,
		  ER(ER_COLUMNACCESS_DENIED_ERROR),
		  MYF(0),
		  command,
		  thd->priv_user,
2718
		  thd->host_or_ip,
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		  field ? field->field_name : "unknown",
		  table->real_name);
  return 1;
}


/****************************************************************************
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  Check if a user has the right to access a database
  Access is accepted if he has a grant for any table in the database
  Return 1 if access is denied
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****************************************************************************/

bool check_grant_db(THD *thd,const char *db)
{
  char helping [NAME_LEN+USERNAME_LENGTH+2];
  uint len;
  bool error=1;

  len  = (uint) (strmov(strmov(helping,thd->priv_user)+1,db)-helping)+ 1;
2738
  rw_rdlock(&LOCK_grant);
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2740
  for (uint idx=0 ; idx < column_priv_hash.records ; idx++)
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  {
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    GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
							  idx);
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    if (len < grant_table->key_length &&
	!memcmp(grant_table->hash_key,helping,len) &&
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	(thd->host && !wild_case_compare(&my_charset_latin1,
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                                         thd->host,grant_table->host) ||
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	 (thd->ip && !wild_case_compare(&my_charset_latin1,
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                                        thd->ip,grant_table->host))))
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    {
      error=0;					// Found match
      break;
    }
  }
2755
  rw_unlock(&LOCK_grant);
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  return error;
}

/*****************************************************************************
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  Functions to retrieve the grant for a table/column  (for SHOW functions)
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*****************************************************************************/

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ulong get_table_grant(THD *thd, TABLE_LIST *table)
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{
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  ulong privilege;
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  char *user = thd->priv_user;
  const char *db = table->db ? table->db : thd->db;
  GRANT_TABLE *grant_table;

2770
  rw_rdlock(&LOCK_grant);
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#ifdef EMBEDDED_LIBRARY
  grant_table= NULL;
#else
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  grant_table = table_hash_search(thd->host,thd->ip,db,user,
				       table->real_name,0);
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#endif
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  table->grant.grant_table=grant_table; // Remember for column test
  table->grant.version=grant_version;
  if (grant_table)
    table->grant.privilege|= grant_table->privs;
2781
  privilege= table->grant.privilege;
2782
  rw_unlock(&LOCK_grant);
2783
  return privilege;
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}


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ulong get_column_grant(THD *thd, TABLE_LIST *table, Field *field)
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{
  GRANT_TABLE *grant_table;
  GRANT_COLUMN *grant_column;
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  ulong priv;
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2793
  rw_rdlock(&LOCK_grant);
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  // reload table if someone has modified any grants
  if (table->grant.version != grant_version)
  {
    table->grant.grant_table=
      table_hash_search(thd->host,thd->ip,thd->db,
			thd->priv_user,
			table->real_name,0);	/* purecov: inspected */
    table->grant.version=grant_version;		/* purecov: inspected */
  }

  if (!(grant_table=table->grant.grant_table))
    priv=table->grant.privilege;
  else
  {
    grant_column=column_hash_search(grant_table, field->field_name,
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				    (uint) strlen(field->field_name));
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    if (!grant_column)
      priv=table->grant.privilege;
    else
      priv=table->grant.privilege | grant_column->rights;
  }
2815
  rw_unlock(&LOCK_grant);
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  return priv;
}


/*****************************************************************************
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  SHOW GRANTS : send to client grant-like strings depicting user@host
  privileges
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*****************************************************************************/

static const char *command_array[]=
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{
  "SELECT", "INSERT","UPDATE","DELETE","CREATE", "DROP", "RELOAD","SHUTDOWN",
  "PROCESS","FILE","GRANT","REFERENCES","INDEX", "ALTER", "SHOW DATABASES",
  "SUPER", "CREATE TEMPORARY TABLES", "LOCK TABLES", "EXECUTE",
  "REPLICATION SLAVE", "REPLICATION CLIENT",
};
static uint command_lengths[]=
{
  6,6,6,6,6,4,6,8,7,4,5,10,5,5,14,5,23,11,7,17,18
};

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int mysql_show_grants(THD *thd,LEX_USER *lex_user)
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{
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  ulong want_access;
  uint counter,index;
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  int  error = 0;
  ACL_USER *acl_user; ACL_DB *acl_db;
  char buff[1024];
2845
  Protocol *protocol= thd->protocol;
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  DBUG_ENTER("mysql_show_grants");
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  LINT_INIT(acl_user);
  if (!initialized)
  {
2851
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    DBUG_RETURN(-1);
  }
  if (lex_user->host.length > HOSTNAME_LENGTH ||
      lex_user->user.length > USERNAME_LENGTH)
  {
    my_error(ER_GRANT_WRONG_HOST_OR_USER,MYF(0));
    DBUG_RETURN(-1);
  }

  for (counter=0 ; counter < acl_users.elements ; counter++)
  {
    const char *user,*host;
    acl_user=dynamic_element(&acl_users,counter,ACL_USER*);
    if (!(user=acl_user->user))
      user="";
    if (!(host=acl_user->host.hostname))
      host="%";
    if (!strcmp(lex_user->user.str,user) &&
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	!my_strcasecmp(&my_charset_latin1, lex_user->host.str, host))
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      break;
  }
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  if (counter == acl_users.elements)
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  {
    my_printf_error(ER_NONEXISTING_GRANT,ER(ER_NONEXISTING_GRANT),
		    MYF(0),lex_user->user.str,lex_user->host.str);
    DBUG_RETURN(-1);
  }

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  Item_string *field=new Item_string("",0,&my_charset_latin1);
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  List<Item> field_list;
  field->name=buff;
  field->max_length=1024;
  strxmov(buff,"Grants for ",lex_user->user.str,"@",
	  lex_user->host.str,NullS);
  field_list.push_back(field);
2887
  if (protocol->send_fields(&field_list,1))
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    DBUG_RETURN(-1);

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  rw_wrlock(&LOCK_grant);
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  VOID(pthread_mutex_lock(&acl_cache->lock));

  /* Add first global access grants */
  {
    want_access=acl_user->access;
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    String global(buff,sizeof(buff),&my_charset_latin1);
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    global.length(0);
    global.append("GRANT ",6);

    if (test_all_bits(want_access, (GLOBAL_ACLS & ~ GRANT_ACL)))
      global.append("ALL PRIVILEGES",14);
    else if (!(want_access & ~GRANT_ACL))
      global.append("USAGE",5);
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    else
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    {
      bool found=0;
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      ulong j,test_access= want_access & ~GRANT_ACL;
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      for (counter=0, j = SELECT_ACL;j <= GLOBAL_ACLS;counter++,j <<= 1)
      {
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	if (test_access & j)
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	{
	  if (found)
	    global.append(", ",2);
	  found=1;
	  global.append(command_array[counter],command_lengths[counter]);
	}
      }
    }
    global.append (" ON *.* TO '",12);
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    global.append(lex_user->user.str,lex_user->user.length);
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    global.append ("'@'",3);
    global.append(lex_user->host.str,lex_user->host.length);
    global.append ('\'');
    if (acl_user->password)
    {
      char passd_buff[HASH_PASSWORD_LENGTH+1];
2927
      make_password_from_salt(passd_buff,acl_user->salt,acl_user->pversion);
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      global.append(" IDENTIFIED BY PASSWORD '",25);
      global.append(passd_buff);
      global.append('\'');
    }
2932 2933
    /* "show grants" SSL related stuff */
    if (acl_user->ssl_type == SSL_TYPE_ANY)
2934
      global.append(" REQUIRE SSL",12);
2935
    else if (acl_user->ssl_type == SSL_TYPE_X509)
2936
      global.append(" REQUIRE X509",13);
2937
    else if (acl_user->ssl_type == SSL_TYPE_SPECIFIED)
2938
    {
2939
      int ssl_options = 0;
2940
      global.append(" REQUIRE ",9);
2941 2942
      if (acl_user->x509_issuer)
      {
2943
        ssl_options++;
2944
        global.append("ISSUER \'",8);
2945
        global.append(acl_user->x509_issuer,strlen(acl_user->x509_issuer));
2946
	global.append('\'');
2947
      }
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      if (acl_user->x509_subject)
      {
        if (ssl_options++)
2951 2952
          global.append(' ');
        global.append("SUBJECT \'",9);
2953
        global.append(acl_user->x509_subject,strlen(acl_user->x509_subject));
2954
	global.append('\'');
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      }
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      if (acl_user->ssl_cipher)
      {
        if (ssl_options++)
2959
          global.append(' ');
2960
        global.append("CIPHER '",8);
2961
        global.append(acl_user->ssl_cipher,strlen(acl_user->ssl_cipher));
2962
	global.append('\'');
2963 2964
      }
    }
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    if ((want_access & GRANT_ACL) ||
	(acl_user->user_resource.questions | acl_user->user_resource.updates |
	 acl_user->user_resource.connections))
2968
    {
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      global.append(" WITH",5);
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      if (want_access & GRANT_ACL)
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	global.append(" GRANT OPTION",13);
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      if (acl_user->user_resource.questions)
      {
	char buff[22], *p; // just as in int2str
	global.append(" MAX_QUERIES_PER_HOUR ",22);
	p=int10_to_str(acl_user->user_resource.questions,buff,10);
	global.append(buff,p-buff);
      }
      if (acl_user->user_resource.updates)
      {
	char buff[22], *p; // just as in int2str
	global.append(" MAX_UPDATES_PER_HOUR ",22);
	p=int10_to_str(acl_user->user_resource.updates,buff,10);
	global.append(buff,p-buff);
      }
      if (acl_user->user_resource.connections)
      {
	char buff[22], *p; // just as in int2str
	global.append(" MAX_CONNECTIONS_PER_HOUR ",26);
	p=int10_to_str(acl_user->user_resource.connections,buff,10);
	global.append(buff,p-buff);
      }
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    }
2994
    protocol->prepare_for_resend();
2995
    protocol->store(global.ptr(),global.length(),global.charset());
2996
    if (protocol->write())
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    {
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      error=-1;
      goto end;
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    }
  }

  /* Add database access */
  for (counter=0 ; counter < acl_dbs.elements ; counter++)
  {
    const char *user,*host;

    acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
    if (!(user=acl_db->user))
      user="";
    if (!(host=acl_db->host.hostname))
      host="";

    if (!strcmp(lex_user->user.str,user) &&
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	!my_strcasecmp(&my_charset_latin1, lex_user->host.str, host))
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    {
      want_access=acl_db->access;
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      if (want_access)
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      {
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	String db(buff,sizeof(buff),&my_charset_latin1);
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	db.length(0);
	db.append("GRANT ",6);

	if (test_all_bits(want_access,(DB_ACLS & ~GRANT_ACL)))
	  db.append("ALL PRIVILEGES",14);
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	else if (!(want_access & ~GRANT_ACL))
	  db.append("USAGE",5);	
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	else
	{
	  int found=0, cnt;
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	  ulong j,test_access= want_access & ~GRANT_ACL;
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	  for (cnt=0, j = SELECT_ACL; j <= DB_ACLS; cnt++,j <<= 1)
	  {
	    if (test_access & j)
	    {
	      if (found)
		db.append(", ",2);
	      found = 1;
	      db.append(command_array[cnt],command_lengths[cnt]);
	    }
	  }
	}
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	db.append (" ON `",5);
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	db.append(acl_db->db);
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	db.append ("`.* TO '",8);
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	db.append(lex_user->user.str,lex_user->user.length);
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	db.append ("'@'",3);
	db.append(lex_user->host.str, lex_user->host.length);
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	db.append ('\'');
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	if (want_access & GRANT_ACL)
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	  db.append(" WITH GRANT OPTION",18);
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	protocol->prepare_for_resend();
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	protocol->store(db.ptr(),db.length(),db.charset());
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	if (protocol->write())
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	{
	  error=-1;
	  goto end;
	}
      }
    }
  }

  /* Add column access */
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  for (index=0 ; index < column_priv_hash.records ; index++)
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  {
    const char *user,*host;
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    GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
							  index);
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    if (!(user=grant_table->user))
      user="";
    if (!(host=grant_table->host))
      host="";

    if (!strcmp(lex_user->user.str,user) &&
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	!my_strcasecmp(&my_charset_latin1, lex_user->host.str, host))
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    {
      want_access=grant_table->privs;
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      if ((want_access | grant_table->cols) != 0)
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      {
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	String global(buff,sizeof(buff),&my_charset_latin1);
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	global.length(0);
	global.append("GRANT ",6);

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	if (test_all_bits(grant_table->privs,(TABLE_ACLS & ~GRANT_ACL)))
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	  global.append("ALL PRIVILEGES",14);
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	else
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	{
	  int found=0;
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	  ulong j,test_access= (want_access | grant_table->cols) & ~GRANT_ACL;
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	  for (counter=0, j = SELECT_ACL;j <= TABLE_ACLS; counter++,j <<= 1)
	  {
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	    if (test_access & j)
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	    {
	      if (found)
		global.append(", ",2);
	      found = 1;
	      global.append(command_array[counter],command_lengths[counter]);

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	      if (grant_table->cols)
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	      {
		uint found_col=0;
		for (uint col_index=0 ;
		     col_index < grant_table->hash_columns.records ;
		     col_index++)
		{
		  GRANT_COLUMN *grant_column = (GRANT_COLUMN*)
		    hash_element(&grant_table->hash_columns,col_index);
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		  if (grant_column->rights & j)
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		  {
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		    if (!found_col)
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		    {
		      global.append(" (",2);
		      found_col=1;
		    }
		    else
		      global.append(", ",2);
		    global.append(grant_column->column,
				  grant_column->key_length);
		  }
		}
		if (found_col)
		  global.append(')');
	      }
	    }
	  }
	}
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	global.append(" ON `",5);
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	global.append(grant_table->db);
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	global.append("`.`",3);
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	global.append(grant_table->tname);
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	global.append("` TO '",6);
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	global.append(lex_user->user.str,lex_user->user.length);
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	global.append("'@'",3);
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	global.append(lex_user->host.str,lex_user->host.length);
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	global.append('\'');
	if (want_access & GRANT_ACL)
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	  global.append(" WITH GRANT OPTION",18);
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	protocol->prepare_for_resend();
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	protocol->store(global.ptr(),global.length(),global.charset());
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	if (protocol->write())
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	{
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	  error= -1;
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	  break;
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	}
      }
    }
  }
 end:
  VOID(pthread_mutex_unlock(&acl_cache->lock));
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  rw_unlock(&LOCK_grant);
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  send_eof(thd);
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  DBUG_RETURN(error);
}


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/*
  Make a clear-text version of the requested privilege.
*/

void get_privilege_desc(char *to, uint max_length, ulong access)
{
  uint pos;
  char *start=to;
  DBUG_ASSERT(max_length >= 30);		// For end ',' removal

  if (access)
  {
    max_length--;				// Reserve place for end-zero
    for (pos=0 ; access ; pos++, access>>=1)
    {
      if ((access & 1) &&
	  command_lengths[pos] + (uint) (to-start) < max_length)
      {
	to= strmov(to, command_array[pos]);
	*to++=',';
      }
    }
    to--;					// Remove end ','
  }
  *to=0;
}


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void get_mqh(const char *user, const char *host, USER_CONN *uc)
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{
  ACL_USER *acl_user;
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  if (initialized && (acl_user= find_acl_user(host,user)))
    uc->user_resources= acl_user->user_resource;
  else
    bzero((char*) &uc->user_resources, sizeof(uc->user_resources));
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}

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int open_grant_tables(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("open_grant_tables");

  if (!initialized)
  {
    send_error(thd, ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES));
    DBUG_RETURN(-1);
  }

  bzero((char*) tables, 4*sizeof(*tables));
  tables->alias= tables->real_name= (char*) "user";
  (tables+1)->alias= (tables+1)->real_name= (char*) "db";
  (tables+2)->alias= (tables+2)->real_name= (char*) "tables_priv";
  (tables+3)->alias= (tables+3)->real_name= (char*) "columns_priv";
  tables->next= tables+1;
  (tables+1)->next= tables+2;
  (tables+2)->next= tables+3;
  (tables+3)->next= 0;
  tables->lock_type= (tables+1)->lock_type=
    (tables+2)->lock_type= (tables+3)->lock_type= TL_WRITE;
  tables->db= (tables+1)->db= (tables+2)->db= (tables+3)->db=(char*) "mysql";

#ifdef HAVE_REPLICATION
  /*
    GRANT and REVOKE are applied the slave in/exclusion rules as they are
    some kind of updates to the mysql.% tables.
  */
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  if (thd->slave_thread && table_rules_on)
  {
    /* 
       The tables must be marked "updating" so that tables_ok() takes them into
       account in tests.
    */
    tables[0].updating=tables[1].updating=tables[2].updating=tables[3].updating=1;
    if (!tables_ok(0, tables))
      DBUG_RETURN(1);
    tables[0].updating=tables[1].updating=tables[2].updating=tables[3].updating=0;
  }
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#endif

  if (open_and_lock_tables(thd, tables))
  {						// This should never happen
    close_thread_tables(thd);
    DBUG_RETURN(-1);
  }

  DBUG_RETURN(0);
}

ACL_USER *check_acl_user(LEX_USER *user_name,
			 uint *acl_user_idx)
{
  ACL_USER *acl_user= 0;
  uint counter;

  for (counter= 0 ; counter < acl_users.elements ; counter++)
  {
    const char *user,*host;
    acl_user= dynamic_element(&acl_users, counter, ACL_USER*);
    if (!(user=acl_user->user))
      user="";
    if (!(host=acl_user->host.hostname))
      host="%";
    if (!strcmp(user_name->user.str,user) &&
	!my_strcasecmp(system_charset_info, user_name->host.str, host))
      break;
  }
  if (counter == acl_users.elements)
    return 0;

  *acl_user_idx= counter;
  return acl_user;    
}

int mysql_drop_user(THD *thd, List <LEX_USER> &list)
{
  uint counter, user_id;
  int result;
  ACL_USER *acl_user;
  ACL_DB *acl_db;
  TABLE_LIST tables[4];

  DBUG_ENTER("mysql_drop_user");

  if ((result= open_grant_tables(thd, tables)))
    DBUG_RETURN(result == 1 ? 0 : -1);

  rw_wrlock(&LOCK_grant);
  VOID(pthread_mutex_lock(&acl_cache->lock));

  LEX_USER *user_name;
  List_iterator <LEX_USER> user_list(list);
  while ((user_name=user_list++))
  {
    if (!(acl_user= check_acl_user(user_name, &counter)))
    {
      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
		      user_name->user.str,
		      user_name->host.str);
      result= -1;
      continue;
    }
    if ((acl_user->access & ~0))
    {
      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
		      user_name->user.str,
		      user_name->host.str);
      result= -1;
      continue;
    }
    user_id= counter;

    for (counter= 0 ; counter < acl_dbs.elements ; counter++)
    {
      const char *user,*host;
      acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
      if (!(user= acl_db->user))
	user="";
      if (!(host= acl_db->host.hostname))
	host="";

      if (!strcmp(user_name->user.str,user) &&
	  !my_strcasecmp(system_charset_info, user_name->host.str, host))
	break;
    }
    if (counter != acl_dbs.elements)
    {
      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
		      user_name->user.str,
		      user_name->host.str);
      result= -1;
      continue;
    }

    for (counter= 0 ; counter < column_priv_hash.records ; counter++)
    {
      const char *user,*host;
      GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
							    counter);
      if (!(user=grant_table->user))
	user="";
      if (!(host=grant_table->host))
	host="";

      if (!strcmp(user_name->user.str,user) &&
	  !my_strcasecmp(system_charset_info, user_name->host.str, host))
	break;
    }
    if (counter != column_priv_hash.records)
    {
      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
		      user_name->user.str,
		      user_name->host.str);
      result= -1;
      continue;
    }

    tables[0].table->field[0]->store(user_name->host.str,(uint) 
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				     user_name->host.length,
				     system_charset_info);
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    tables[0].table->field[1]->store(user_name->user.str,(uint) 
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				     user_name->user.length,
				     system_charset_info);
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    if (!tables[0].table->file->index_read_idx(tables[0].table->record[0],0,
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					       (byte*) tables[0].table->
					       field[0]->ptr,0,
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					       HA_READ_KEY_EXACT))
    {
      int error;
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      if ((error = tables[0].table->file->delete_row(tables[0].table->
						     record[0])))
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      {
	tables[0].table->file->print_error(error, MYF(0));
	tables[0].table->file->index_end();
	DBUG_RETURN(-1);
      }
      delete_dynamic_element(&acl_users, user_id);
    }
    tables[0].table->file->index_end();
  }
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  VOID(pthread_mutex_unlock(&acl_cache->lock));
  rw_unlock(&LOCK_grant);
  close_thread_tables(thd);
  if (result)
    my_error(ER_DROP_USER, MYF(0));
  DBUG_RETURN(result);
}

int mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
{
  uint counter;
  int result;
  ACL_USER *acl_user; ACL_DB *acl_db;
  TABLE_LIST tables[4];
  DBUG_ENTER("mysql_revoke_all");

  if ((result= open_grant_tables(thd, tables)))
    DBUG_RETURN(result == 1 ? 0 : -1);

  rw_wrlock(&LOCK_grant);
  VOID(pthread_mutex_lock(&acl_cache->lock));

  LEX_USER *lex_user;
  List_iterator <LEX_USER> user_list(list);
  while ((lex_user=user_list++))
  {
    if (!(acl_user= check_acl_user(lex_user, &counter)))
    {
      sql_print_error("REVOKE ALL PRIVILEGES, GRANT: User '%s'@'%s' not exists",
		      lex_user->user.str,
		      lex_user->host.str);
      result= -1;
      continue;
    }
    
    if (replace_user_table(thd, tables[0].table,
			   *lex_user, ~0, 1, 0))
    {
      result= -1;
      continue;
    }

    /* Remove db access privileges */
    for (counter= 0 ; counter < acl_dbs.elements ; counter++)
    {
      const char *user,*host;

      acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
      if (!(user=acl_db->user))
	user="";
      if (!(host=acl_db->host.hostname))
	host="";

      if (!strcmp(lex_user->user.str,user) &&
	  !my_strcasecmp(system_charset_info, lex_user->host.str, host))
      {
	if (replace_db_table(tables[1].table, acl_db->db, *lex_user, ~0, 1))
	  result= -1;
      }
    }

    /* Remove column access */
    for (counter= 0 ; counter < column_priv_hash.records ; counter++)
    {
      const char *user,*host;
      GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
							    counter);
      if (!(user=grant_table->user))
	user="";
      if (!(host=grant_table->host))
	host="";

      if (!strcmp(lex_user->user.str,user) &&
	  !my_strcasecmp(system_charset_info, lex_user->host.str, host))
      {
	if (replace_table_table(thd,grant_table,tables[2].table,*lex_user,
				grant_table->db,
				grant_table->tname,
				~0, 0, 1))
	{
	  result= -1;
	  continue;
	}
	if (grant_table->cols)
	{
	  List<LEX_COLUMN> columns;
	  if (replace_column_table(grant_table,tables[3].table, *lex_user,
				   columns,
				   grant_table->db,
				   grant_table->tname,
				   ~0, 1))
	    result= -1;
	}
      }
    }
  }

  VOID(pthread_mutex_unlock(&acl_cache->lock));
  rw_unlock(&LOCK_grant);
  close_thread_tables(thd);
  if (result)
    my_error(ER_REVOKE_GRANTS, MYF(0));
  DBUG_RETURN(result);
}
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/*****************************************************************************
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  Instantiate used templates
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*****************************************************************************/

#ifdef __GNUC__
template class List_iterator<LEX_COLUMN>;
template class List_iterator<LEX_USER>;
template class List<LEX_COLUMN>;
template class List<LEX_USER>;
#endif