First version of new authentification procedure: now authentification is...

First version of new authentification procedure: now authentification is one-stage (instead of two-stage in 4.1)

For now following tasks have been done:
- PASSWORD() function was rewritten. PASSWORD() now returns SHA1
  hash_stage2; for new passwords user.password contains '*'hash_stage2; sql_yacc.yy also fixed; 

- password.c: new functions were implemented, old rolled back to 4.0 state

- server code was rewritten to use new authorization algorithm (check_user(), change
  user, and other stuff in sql/sql_parse.cc)

- client code was rewritten to use new authorization algorithm
  (mysql_real_connect, myslq_authenticate in sql-common/client.c)

- now server barks on 45-byte-length 4.1.0 passwords and refuses 4.1.0-style
  authentification. Users with 4.1.0 passwords are blocked (sql/sql_acl.cc)

- mysqladmin.c was fixed to work correctly with new passwords

Tests for 4.0-4.1.1, 4.1.1-4.1.1 (with or without db/password) logons was performed;
mysqladmin also was tested. Additional check are nevertheless necessary.

.bzrignore

@@ -622,3 +622,5 @@ vio/test-ssl
 vio/test-sslclient
 vio/test-sslserver
 vio/viotest-ssl
+start_mysqld.sh
+mysys/main.cc

BitKeeper/etc/logging_ok

@@ -51,6 +51,7 @@ jcole@sarvik.tfr.cafe.ee
 jcole@tetra.spaceapes.com
 jorge@linux.jorge.mysql.com
 kaj@work.mysql.com
+kostja@oak.local
 lenz@kallisto.mysql.com
 lenz@mysql.com
 miguel@hegel.(none)

client/mysqladmin.c

@@ -769,9 +769,12 @@ static int execute_commands(MYSQL *mysql,int argc, char **argv)
 	return 1;
       }
       if (argv[1][0])
-	make_scrambled_password(crypted_pw,argv[1],
-                                (find_type(argv[0], &command_typelib, 2) ==
-                                 ADMIN_OLD_PASSWORD), &rand_st);
+      {
+        if (find_type(argv[0], &command_typelib, 2) == ADMIN_OLD_PASSWORD)
+          make_scrambled_password_323(crypted_pw, argv[1]);
+        else
+          make_scrambled_password(crypted_pw, argv[1]);
+      }
       else
 	crypted_pw[0]=0;			/* No password */
       sprintf(buff,"set password='%s',sql_log_off=0",crypted_pw);

include/mysql.h

@@ -227,7 +227,9 @@ typedef struct st_mysql
   enum mysql_status status;
   my_bool	free_me;		/* If free in mysql_close */
   my_bool	reconnect;		/* set to 1 if automatic reconnect */
-  char	        scramble_buff[21];      /* New protocol requires longer scramble*/
+
+  char	        scramble[SCRAMBLE_LENGTH+1]; /* for new servers */
+  char          scramble_323[SCRAMBLE_LENGTH_323+1]; /* for old servers */
 
  /*
    Set if this is the original connection, not a master or a slave we have

include/mysql_com.h

@@ -48,8 +48,15 @@ enum enum_server_command
 };
 
 
-#define SCRAMBLE_LENGTH   8
-#define SCRAMBLE41_LENGTH 20
+/*
+  Length of random string sent by server on handshake; this is also length of
+  obfuscated password, recieved from client 
+*/
+#define SCRAMBLE_LENGTH 20
+#define SCRAMBLE_LENGTH_323 8
+/* length of password stored in the db: new passwords are preceeded with '*' */
+#define SCRAMBLED_PASSWORD_CHAR_LENGTH (SCRAMBLE_LENGTH*2+1)
+#define SCRAMBLED_PASSWORD_CHAR_LENGTH_323 (SCRAMBLE_LENGTH_323*2)
 
 
 #define NOT_NULL_FLAG	1		/* Field can't be NULL */
@@ -300,31 +307,35 @@ extern "C" {
 extern unsigned long max_allowed_packet;
 extern unsigned long net_buffer_length;
 
-void randominit(struct rand_struct *,unsigned long seed1,
-		unsigned long seed2);
+/*
+  These functions are used for authentication by client and server and
+  implemented in sql/password.c
+*/
+
+void randominit(struct rand_struct *, unsigned long seed1,
+                unsigned long seed2);
 double my_rnd(struct rand_struct *);
-void make_scrambled_password(char *to,const char *password,
-     my_bool force_old_scramble,struct rand_struct *rand_st);
-int get_password_length(my_bool force_old_scramble);
-char get_password_version(const char* password);
-void create_random_string(int length,struct rand_struct *rand_st,char* target);
-my_bool validate_password(const char* password, const char* message,
-        unsigned long* salt);
-void password_hash_stage1(char *to, const char *password);
-void password_hash_stage2(char *to,const char *salt);
-void password_crypt(const char* from,char* to, const char* password,int length);
-void get_hash_and_password(unsigned long* salt, unsigned char  pversion,char* hash,
-     unsigned char* bin_password);
-void get_salt_from_password(unsigned long *res,const char *password);
-void create_key_from_old_password(const char* password,char* key);
-void make_password_from_salt(char *to, unsigned long *hash_res,
-     unsigned char  password_version);
-char *scramble(char *to,const char *message,const char *password,
-	       my_bool old_ver);
-my_bool check_scramble(const char *, const char *message,
-		       unsigned long *salt,my_bool old_ver);
+void create_random_string(char *to, uint length, struct rand_struct *rand_st);
+
+void hash_password(ulong *to, const char *password);
+void make_scrambled_password_323(char *to, const char *password);
+char *scramble_323(char *to, const char *message, const char *password,
+                   my_bool old_ver);
+my_bool check_scramble_323(const char *, const char *message,
+                           unsigned long *salt, my_bool old_ver);
+void get_salt_from_password_323(unsigned long *res, const char *password);
+void make_password_from_salt_323(char *to, const unsigned long *salt);
+
+void make_scrambled_password(char *to, const char *password);
+char *scramble(char *to, const char *message, const char *password);
+my_bool check_scramble(const char *reply, const char *message,
+                       const unsigned char *hash_stage2);
+void get_salt_from_password(unsigned char *res, const char *password);
+void make_password_from_salt(char *to, const unsigned char *hash_stage2);
+
+/* end of password.c */
+
 char *get_tty_password(char *opt_message);
-void hash_password(unsigned long *result, const char *password);
 const char *mysql_errno_to_sqlstate(unsigned int mysql_errno);
 
 /* Some other useful functions */

libmysql/libmysql.c

@@ -616,41 +616,51 @@ my_bool	STDCALL mysql_change_user(MYSQL *mysql, const char *user,
   /* Store user into the buffer */
   end=strmov(end,user)+1;
 
-  /*
-    We always start with old type handshake the only difference is message sent
-    If server handles secure connection type we'll not send the real scramble
-  */
-  if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
+  /* write scrambled password according to server capabilities */
+  if (passwd[0])
   {
-    if (passwd[0])
-    {
-      /* Prepare false scramble  */
-      bfill(end, SCRAMBLE_LENGTH, 'x');
-      end+=SCRAMBLE_LENGTH;
-      *end=0;
-
-    }
-    else					/* For empty password */
-      *end=0;					/* zero length scramble */
+    /* Write NULL-terminated scrambled password: */
+    end= mysql->server_capabilities & CLIENT_SECURE_CONNECTION ?
+      scramble(end, mysql->scramble, passwd) :
+      scramble_323(end, mysql->scramble_323, passwd,
+                   (my_bool) (mysql->protocol_version == 9));
   }
   else
-  {
-    /*
-      Real scramble is only sent to old servers. This can be blocked 
-      by calling mysql_options(MYSQL *, MYSQL_SECURE_CONNECT, (char*) &1);
-    */
-    end=scramble(end, mysql->scramble_buff, passwd,
-                 (my_bool) (mysql->protocol_version == 9));
-  }
+    *end= '\0';                                 // empty password
   /* Add database if needed */
   end=strmov(end+1,db ? db : "");
 
   /* Write authentication package */
   simple_command(mysql,COM_CHANGE_USER, buff,(ulong) (end-buff),1);
 
-  if (mysql_autenticate(mysql, passwd))
+  NET *net= &mysql->net;
+  ulong pkt_length= net_safe_read(mysql);
+
+  if (pkt_length == packet_error)
     goto error;
 
+  if (net->read_pos[0] == mysql->scramble_323[0] &&
+      pkt_length == SCRAMBLE_LENGTH_323 + 1 &&
+      mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
+  {
+    /*
+      By sending this very specific reply server asks us to send scrambled
+      password in old format. The reply contains scramble_323.
+    */
+    scramble_323(buff, mysql->scramble_323, passwd,
+                 (my_bool) (mysql->protocol_version == 9));
+    if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
+    {
+      net->last_errno= CR_SERVER_LOST;
+      strmov(net->sqlstate, unknown_sqlstate);
+      strmov(net->last_error,ER(net->last_errno));
+      goto error;
+    }
+    /* Read what server thinks about out new auth message report */
+    if (net_safe_read(mysql) == packet_error)
+      goto error;
+  }
+
   /* Free old connect information */
   my_free(mysql->user,MYF(MY_ALLOW_ZERO_PTR));
   my_free(mysql->passwd,MYF(MY_ALLOW_ZERO_PTR));

scripts/mysql_create_system_tables.sh

@@ -108,7 +108,7 @@ then
   c_u="$c_u CREATE TABLE user ("
   c_u="$c_u   Host char(60) binary DEFAULT '' NOT NULL,"
   c_u="$c_u   User char(16) binary DEFAULT '' NOT NULL,"
-  c_u="$c_u   Password char(45) binary DEFAULT '' NOT NULL,"
+  c_u="$c_u   Password char(41) binary DEFAULT '' NOT NULL,"
   c_u="$c_u   Select_priv enum('N','Y') DEFAULT 'N' NOT NULL,"
   c_u="$c_u   Insert_priv enum('N','Y') DEFAULT 'N' NOT NULL,"
   c_u="$c_u   Update_priv enum('N','Y') DEFAULT 'N' NOT NULL,"

scripts/mysql_fix_privilege_tables.sql

@@ -4,7 +4,7 @@ ALTER TABLE host type=MyISAM;
 ALTER TABLE func type=MyISAM;
 ALTER TABLE columns_priv type=MyISAM;
 ALTER TABLE tables_priv type=MyISAM;
-ALTER TABLE user change Password Password char(45) not null;
+ALTER TABLE user change Password Password char(41) not null;
 ALTER TABLE user add File_priv enum('N','Y') NOT NULL;
 CREATE TABLE IF NOT EXISTS func (
   name char(64) DEFAULT '' NOT NULL,

sql-common/client.c

@@ -1334,76 +1334,6 @@ mysql_ssl_free(MYSQL *mysql __attribute__((unused)))
 #endif /* HAVE_OPENSSL */
 
 
-/*
-  Handle password authentication
-*/
-
-my_bool mysql_autenticate(MYSQL *mysql, const char *passwd)
-{
-  ulong pkt_length;
-  NET *net= &mysql->net;
-  char buff[SCRAMBLE41_LENGTH];
-  char password_hash[SCRAMBLE41_LENGTH]; /* Used for storage of stage1 hash */
-
-  /* We shall only query server if it expect us to do so */
-  if ((pkt_length=net_safe_read(mysql)) == packet_error)
-    goto error;
-
-  if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
-  {
-    /*
-      This should always happen with new server unless empty password
-      OK/Error packets have zero as the first char
-    */
-    if (pkt_length == 24 && net->read_pos[0])
-    {
-      /* Old passwords will have '*' at the first byte of hash */
-      if (net->read_pos[0] != '*')
-      {
-        /* Build full password hash as it is required to decode scramble */
-        password_hash_stage1(buff, passwd);
-        /* Store copy as we'll need it later */
-        memcpy(password_hash,buff,SCRAMBLE41_LENGTH);
-        /* Finally hash complete password using hash we got from server */
-        password_hash_stage2(password_hash,(const char*) net->read_pos);
-        /* Decypt and store scramble 4 = hash for stage2 */
-        password_crypt((const char*) net->read_pos+4,mysql->scramble_buff,
-		       password_hash, SCRAMBLE41_LENGTH);
-        mysql->scramble_buff[SCRAMBLE41_LENGTH]=0;
-        /* Encode scramble with password. Recycle buffer */
-        password_crypt(mysql->scramble_buff,buff,buff,SCRAMBLE41_LENGTH);
-      }
-      else
-      {
-	/* Create password to decode scramble */
-	create_key_from_old_password(passwd,password_hash);
-	/* Decypt and store scramble 4 = hash for stage2 */
-	password_crypt((const char*) net->read_pos+4,mysql->scramble_buff,
-		       password_hash, SCRAMBLE41_LENGTH);
-	mysql->scramble_buff[SCRAMBLE41_LENGTH]=0;
-	/* Finally scramble decoded scramble with password */
-	scramble(buff, mysql->scramble_buff, passwd,0);
-      }
-      /* Write second package of authentication */
-      if (my_net_write(net,buff,SCRAMBLE41_LENGTH) || net_flush(net))
-      {
-        net->last_errno= CR_SERVER_LOST;
-	strmov(net->sqlstate, unknown_sqlstate);
-        strmov(net->last_error,ER(net->last_errno));
-        goto error;
-      }
-      /* Read what server thinks about out new auth message report */
-      if (net_safe_read(mysql) == packet_error)
-	goto error;
-    }
-  }
-  return 0;
-
-error:
-  return 1;
-}
-
-
 /*
   Note that the mysql argument must be initialized with mysql_init()
   before calling mysql_real_connect !
@@ -1481,7 +1411,7 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
   mysql->server_status=SERVER_STATUS_AUTOCOMMIT;
 
   /*
-    Grab a socket and connect it to the server
+    Part 0: Grab a socket and connect it to the server
   */
 #if defined(HAVE_SMEM)
   if ((!mysql->options.protocol ||
@@ -1682,6 +1612,11 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
     strmov(net->last_error,ER(net->last_errno));
     goto error;
   }
+
+  /*
+    Part 1: Connection established, read and parse first packet
+  */
+
   if ((pkt_length=net_safe_read(mysql)) == packet_error)
     goto error;
 
@@ -1702,8 +1637,14 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
   end=strend((char*) net->read_pos+1);
   mysql->thread_id=uint4korr(end+1);
   end+=5;
-  strmake(mysql->scramble_buff,end,8);
-  end+=9;
+  /* 
+    Scramble is split into two parts because old clients does not understand
+    long scrambles; here goes the first part.
+  */
+  strmake(mysql->scramble_323, end, SCRAMBLE_LENGTH_323);
+  end+= SCRAMBLE_LENGTH_323+1;
+  memcpy(mysql->scramble, mysql->scramble_323, SCRAMBLE_LENGTH_323);
+
   if (pkt_length >= (uint) (end+1 - (char*) net->read_pos))
     mysql->server_capabilities=uint2korr(end);
   if (pkt_length >= (uint) (end+18 - (char*) net->read_pos))
@@ -1712,6 +1653,13 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
     mysql->server_language=end[2];
     mysql->server_status=uint2korr(end+3);
   }
+  end+= 18;
+  if (pkt_length >= (uint) (end + SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323 + 1 - 
+                           (char *) net->read_pos))
+    strmake(mysql->scramble+SCRAMBLE_LENGTH_323, end,
+            SCRAMBLE_LENGTH-SCRAMBLE_LENGTH_323);
+  else
+    mysql->server_capabilities&= ~CLIENT_SECURE_CONNECTION;
 
   /* Set character set */
   if ((charset_name=mysql->options.charset_name))
@@ -1783,9 +1731,12 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
     mysql->unix_socket=0;
   strmov(mysql->server_version,(char*) net->read_pos+1);
   mysql->port=port;
-  client_flag|=mysql->options.client_flag;
 
-  /* Send client information for access check */
+  /*
+    Part 2: format and send client info to the server for access check
+  */
+  
+  client_flag|=mysql->options.client_flag;
   client_flag|=CLIENT_CAPABILITIES;
   if (client_flag & CLIENT_MULTI_QUERIES)
     client_flag|= CLIENT_MULTI_RESULTS;
@@ -1881,35 +1832,18 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
 #include "_cust_libmysql.h"
 #endif
   DBUG_PRINT("info",("user: %s",end));
-  /*
-    We always start with old type handshake the only difference is message sent
-    If server handles secure connection type we'll not send the real scramble
-  */
-  if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
+  end= strend(end) + 1;
+  if (passwd[0])
   {
-    if (passwd[0])
-    {
-      /* Prepare false scramble  */
-      end=strend(end)+1;
-      bfill(end, SCRAMBLE_LENGTH, 'x');
-      end+=SCRAMBLE_LENGTH;
-      *end=0;
-    }
-    else				/* For empty password*/
-    {
-      end=strend(end)+1;
-      *end=0;				/* Store zero length scramble */
-    }
+    /* Write NULL-terminated scrambled password: */
+    end= mysql->server_capabilities & CLIENT_SECURE_CONNECTION ?
+      scramble(end, mysql->scramble, passwd) :
+      scramble_323(end, mysql->scramble_323, passwd,
+                   (my_bool) (mysql->protocol_version == 9));
   }
   else
-  {
-    /*
-      Real scramble is only sent to old servers. This can be blocked 
-      by calling mysql_options(MYSQL *, MYSQL_SECURE_CONNECT, (char*) &1);
-    */
-    end=scramble(strend(end)+1, mysql->scramble_buff, passwd,
-                 (my_bool) (mysql->protocol_version == 9));
-  }
+    *end= '\0';                                 /* empty password */
+
   /* Add database if needed */
   if (db && (mysql->server_capabilities & CLIENT_CONNECT_WITH_DB))
   {
@@ -1925,10 +1859,38 @@ mysql_real_connect(MYSQL *mysql,const char *host, const char *user,
     strmov(net->last_error,ER(net->last_errno));
     goto error;
   }
+  
+  /*
+    Part 3: Authorization data's been sent. Now server can reply with
+    OK-packet, or re-request scrambled password.
+  */
 
-  if (mysql_autenticate(mysql, passwd))
+  if ((pkt_length=net_safe_read(mysql)) == packet_error)
     goto error;
 
+  if (net->read_pos[0] == mysql->scramble_323[0] &&
+      pkt_length == SCRAMBLE_LENGTH_323 + 1 &&
+      mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
+  {
+    /*
+      By sending this very specific reply server asks us to send scrambled
+      password in old format. The reply contains scramble_323.
+    */
+    scramble_323(buff, mysql->scramble_323, passwd,
+                 (my_bool) (mysql->protocol_version == 9));
+    if (my_net_write(net, buff, SCRAMBLE_LENGTH_323 + 1) || net_flush(net))
+    {
+      net->last_errno= CR_SERVER_LOST;
+      strmov(net->sqlstate, unknown_sqlstate);
+      strmov(net->last_error,ER(net->last_errno));
+      goto error;
+    }
+    /* Read what server thinks about out new auth message report */
+    if (net_safe_read(mysql) == packet_error)
+      goto error;
+  }
+
+
   if (client_flag & CLIENT_COMPRESS)		/* We will use compression */
     net->compress=1;
 

sql/item_strfunc.cc

@@ -1346,97 +1346,35 @@ void Item_func_trim::fix_length_and_dec()
 }
 
 
-
-
-void Item_func_password::fix_length_and_dec()
-{
-  /*
-    If PASSWORD() was called with only one argument, it depends on a random
-    number so we need to save this random number into the binary log.
-    If called with two arguments, it is repeatable.
-  */
-  if (arg_count == 1)
-  {
-    THD *thd= current_thd;
-    thd->rand_used= 1;
-    thd->rand_saved_seed1= thd->rand.seed1;
-    thd->rand_saved_seed2= thd->rand.seed2;
-  } 
-  max_length= get_password_length(use_old_passwords);
-}
-
-/*
- Password() function has 2 arguments. Second argument can be used
- to make results repeatable
-*/ 
+/* Item_func_password */
 
 String *Item_func_password::val_str(String *str)
 {
-  struct rand_struct rand_st; // local structure for 2 param version
-  ulong  seed=0;              // seed to initialise random generator to
-  
-  String *res  =args[0]->val_str(str);          
+  String *res= args[0]->val_str(str); 
   if ((null_value=args[0]->null_value))
     return 0;
-  
-  if (arg_count == 1)
-  {    
-    if (res->length() == 0)
-      return &empty_string;
-    make_scrambled_password(tmp_value,res->c_ptr(),use_old_passwords,
-                            &current_thd->rand);
-    str->set(tmp_value,get_password_length(use_old_passwords),res->charset());
-    return str;
-  }
-  else
-  {
-   /* We'll need the buffer to get second parameter */
-    char key_buff[80];
-    String tmp_key_value(key_buff, sizeof(key_buff), system_charset_info);
-    String *key  =args[1]->val_str(&tmp_key_value);          
-    
-    /* Check second argument for NULL value. First one is already checked */
-    if ((null_value=args[1]->null_value))
-      return 0;
-      
-    /* This shall be done after checking for null for proper results */       
-    if (res->length() == 0)
-      return &empty_string;  
-      
-    /* Generate the seed first this allows to avoid double allocation */  
-    char* seed_ptr=key->c_ptr();
-    while (*seed_ptr)
-    {
-      seed=(seed*211+*seed_ptr) & 0xffffffffL; /* Use simple hashing */
-      seed_ptr++;
-    }
-    
-    /* Use constants which allow nice random values even with small seed */
-    randominit(&rand_st,
-	       (ulong) ((ulonglong) seed*111111+33333333L) & (ulong) 0xffffffff,
-	       (ulong) ((ulonglong) seed*1111+55555555L) & (ulong) 0xffffffff);
-    
-    make_scrambled_password(tmp_value,res->c_ptr(),use_old_passwords,
-                            &rand_st);
-    str->set(tmp_value,get_password_length(use_old_passwords),res->charset());
-    return str;
-  }       
+  if (res->length() == 0)
+    return &empty_string;
+  make_scrambled_password(tmp_value, res->c_ptr());
+  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH, res->charset());
+  return str;
 }
 
+/* Item_func_old_password */
+
 String *Item_func_old_password::val_str(String *str)
 {
-  String *res  =args[0]->val_str(str);
+  String *res= args[0]->val_str(str);
   if ((null_value=args[0]->null_value))
     return 0;
   if (res->length() == 0)
     return &empty_string;
-  make_scrambled_password(tmp_value,res->c_ptr(),1,&current_thd->rand);
-  str->set(tmp_value,16,res->charset());
+  make_scrambled_password_323(tmp_value, res->c_ptr());
+  str->set(tmp_value, SCRAMBLED_PASSWORD_CHAR_LENGTH_323, res->charset());
   return str;
 }
 
 
-
 #define bin_to_ascii(c) ((c)>=38?((c)-38+'a'):(c)>=12?((c)-12+'A'):(c)+'.')
 
 String *Item_func_encrypt::val_str(String *str)

sql/item_strfunc.h

@@ -254,30 +254,44 @@ public:
 };
 
 
+/*
+  Item_func_password -- new (4.1.1) PASSWORD() function implementation.
+  Returns strcat('*', octet2hex(sha1(sha1(password)))). '*' stands for new
+  password format, sha1(sha1(password) is so-called hash_stage2 value.
+  Length of returned string is always 41 byte. To find out how entire
+  authentification procedure works, see comments in password.c.
+*/
+
 class Item_func_password :public Item_str_func
 {
-  char tmp_value[64]; /* This should be enough for new password format */
+  char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH+1]; 
 public:
   Item_func_password(Item *a) :Item_str_func(a) {}
-  Item_func_password(Item *a, Item *b) :Item_str_func(a,b) {}
-  String *val_str(String *);
-  void fix_length_and_dec();
+  String *val_str(String *str);
+  void fix_length_and_dec() { max_length= SCRAMBLED_PASSWORD_CHAR_LENGTH; }
   const char *func_name() const { return "password"; }
 };
 
 
+/*
+  Item_func_old_password -- PASSWORD() implementation used in MySQL 3.21 - 4.0
+  compatibility mode. This item is created in sql_yacc.yy when
+  'use_old_passwords' session variable is set, and to handle OLD_PASSWORD()
+  function.
+*/
+
 class Item_func_old_password :public Item_str_func
 {
-  char tmp_value[17]; /* old password length +1 */
+  char tmp_value[SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1];
 public:
   Item_func_old_password(Item *a) :Item_str_func(a) {}
-  String *val_str(String *);
-  void fix_length_and_dec() { max_length = get_password_length(1); }
+  String *val_str(String *str);
+  void fix_length_and_dec() { max_length= SCRAMBLED_PASSWORD_CHAR_LENGTH_323; } 
   const char *func_name() const { return "old_password"; }
+  unsigned int size_of() { return sizeof(*this);}  
 };
 
 
-
 class Item_func_des_encrypt :public Item_str_func
 {
   String tmp_value;

sql/mysql_priv.h

@@ -74,9 +74,6 @@ extern CHARSET_INFO *national_charset_info, *table_alias_charset;
 ****************************************************************************/
 
 #define ACL_CACHE_SIZE		256
-/* Password lengh for 4.1 version previous versions had 16 bytes password hash */
-#define HASH_PASSWORD_LENGTH	45
-#define HASH_OLD_PASSWORD_LENGTH 16
 #define HOST_CACHE_SIZE		128
 #define MAX_ACCEPT_RETRY	10	// Test accept this many times
 #define MAX_FIELDS_BEFORE_HASH	32

sql/mysqld.cc

@@ -2743,12 +2743,6 @@ static void create_new_thread(THD *thd)
   if (thread_count-delayed_insert_threads > max_used_connections)
     max_used_connections=thread_count-delayed_insert_threads;
   thd->thread_id=thread_id++;
-  for (uint i=0; i < 8 ; i++)			// Generate password teststring
-    thd->scramble[i]= (char) (my_rnd(&sql_rand)*94+33);
-  thd->scramble[8]=0;
-  // Back it up as old clients may need it
-  memcpy(thd->old_scramble,thd->scramble,9);
-
 
   thd->real_id=pthread_self();			// Keep purify happy
 

sql/slave.cc

@@ -1459,7 +1459,7 @@ int init_master_info(MASTER_INFO* mi, const char* master_info_fname,
     if (master_user)
       strmake(mi->user, master_user, sizeof(mi->user) - 1);
     if (master_password)
-      strmake(mi->password, master_password, HASH_PASSWORD_LENGTH);
+      strmake(mi->password, master_password, SCRAMBLED_PASSWORD_CHAR_LENGTH);
     mi->port = master_port;
     mi->connect_retry = master_connect_retry;
   }
@@ -1483,8 +1483,8 @@ int init_master_info(MASTER_INFO* mi, const char* master_info_fname,
 			      master_host) ||
 	init_strvar_from_file(mi->user, sizeof(mi->user), &mi->file,
 			      master_user) || 
-	init_strvar_from_file(mi->password, HASH_PASSWORD_LENGTH+1, &mi->file,
-			      master_password) ||
+        init_strvar_from_file(mi->password, SCRAMBLED_PASSWORD_CHAR_LENGTH+1,
+                              &mi->file, master_password) ||
 	init_intvar_from_file(&port, &mi->file, master_port) ||
 	init_intvar_from_file(&connect_retry, &mi->file,
 			      master_connect_retry))

sql/slave.h

@@ -292,7 +292,7 @@ typedef struct st_master_info
   /* the variables below are needed because we can change masters on the fly */
   char host[HOSTNAME_LENGTH+1];
   char user[USERNAME_LENGTH+1];
-  char password[HASH_PASSWORD_LENGTH+1];
+  char password[SCRAMBLED_PASSWORD_CHAR_LENGTH+1];
   pthread_mutex_t data_lock,run_lock;
   pthread_cond_t data_cond,start_cond,stop_cond;
   THD *io_thd;

sql/sql_acl.h

@@ -111,9 +111,9 @@ public:
   acl_host_and_ip host;
   uint hostname_length;
   USER_RESOURCES user_resource;
-  char *user,*password;
-  ulong salt[6]; // New password has longer length
-  uint8 pversion; // password version
+  char *user;
+  uint8 salt[SCRAMBLE_LENGTH+1];       // scrambled password in binary form
+  uint8 salt_len;        // 0 - no password, 4 - 3.20, 8 - 3.23, 20 - 4.1.1 
   enum SSL_type ssl_type;
   const char *ssl_cipher, *x509_issuer, *x509_subject;
 };
@@ -135,11 +135,8 @@ void acl_reload(THD *thd);
 void acl_free(bool end=0);
 ulong acl_get(const char *host, const char *ip, const char *bin_ip,
 	      const char *user, const char *db);
-ulong acl_getroot(THD *thd, const char *host, const char *ip, const char *user,
-		  const char *password,const char *scramble,
-                  char **priv_user, char *priv_host,
-		  bool old_ver, USER_RESOURCES *max,char* prepared_scramble,
-                  uint *cur_priv_version, ACL_USER **cached_user);
+int acl_getroot(THD *thd, USER_RESOURCES *mqh,
+                const char *passwd, uint passwd_len, bool old_ver);
 bool acl_check_host(const char *host, const char *ip);
 bool check_change_password(THD *thd, const char *host, const char *user);
 bool change_password(THD *thd, const char *host, const char *user,

sql/sql_class.cc

@@ -139,6 +139,7 @@ THD::THD():user_time(0), is_fatal_error(0),
   set_query_id=1;
   db_access=NO_ACCESS;
   version=refresh_version;			// For boot
+  *scramble= *scramble_323= '\0';
 
   init();
   /* Initialize sub structures */

sql/sql_class.h

@@ -529,10 +529,16 @@ public:
   enum_tx_isolation session_tx_isolation;
   /* for user variables replication*/
   DYNAMIC_ARRAY user_var_events;
-             // extend scramble to handle new auth
-  char	     scramble[SCRAMBLE41_LENGTH+1];
-             // old scramble is needed to handle old clients
-  char       old_scramble[SCRAMBLE_LENGTH+1];
+
+  /* scramble - random string sent to client on handshake */
+  char	     scramble[SCRAMBLE_LENGTH+1];
+  /*
+    The same as scramble but for old password checking routines. It always
+    contains first N bytes of scramble.
+    See check_connection() at sql_parse.cc for authentification details.
+  */
+  char       scramble_323[SCRAMBLE_LENGTH_323+1];
+
   uint8	     query_cache_type;		// type of query cache processing
   bool       slave_thread;
   bool	     set_query_id,locked,count_cuted_fields,some_tables_deleted;

sql/sql_repl.h

@@ -7,7 +7,7 @@ typedef struct st_slave_info
   uint32 rpl_recovery_rank, master_id;
   char host[HOSTNAME_LENGTH+1];
   char user[USERNAME_LENGTH+1];
-  char password[HASH_PASSWORD_LENGTH+1];
+  char password[SCRAMBLED_PASSWORD_CHAR_LENGTH+1];
   uint16 port;
   THD* thd;
 } SLAVE_INFO;

sql/sql_yacc.yy

@@ -2515,9 +2515,10 @@ simple_expr:
 	| NOW_SYM '(' expr ')'
 	  { $$= new Item_func_now($3); Lex->safe_to_cache_query=0;}
 	| PASSWORD '(' expr ')'
-	  { $$= new Item_func_password($3); }
-        | PASSWORD '(' expr ',' expr ')'
-          { $$= new Item_func_password($3,$5); }
+	  {
+            $$= use_old_passwords ?  (Item *) new Item_func_old_password($3) :
+              (Item *) new Item_func_password($3);
+          }
 	| POINT_SYM '(' expr ',' expr ')'
 	  { $$= new Item_func_point($3,$5); }
  	| POINTFROMTEXT '(' expr ')'
@@ -4604,13 +4605,22 @@ text_or_password:
 	  {
 	    if (!$3.length)
 	      $$=$3.str;
-	    else
+	    else if (use_old_passwords)
 	    {
-	      char *buff=(char*) YYTHD->alloc(HASH_PASSWORD_LENGTH+1);
-	      make_scrambled_password(buff,$3.str,use_old_passwords,
-				      &YYTHD->rand);
+	      char *buff= (char *)
+                YYTHD->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1);
+              if (buff)
+                make_scrambled_password_323(buff, $3.str);
 	      $$=buff;
 	    }
+            else
+            {
+	      char *buff= (char *)
+                YYTHD->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH+1);
+              if (buff)
+                make_scrambled_password(buff, $3.str);
+	      $$=buff;
+            }
 	  }
           ;
 
@@ -4918,14 +4928,24 @@ grant_user:
 	   $$=$1; $1->password=$4;
 	   if ($4.length)
 	   {
-	     char *buff=(char*) YYTHD->alloc(HASH_PASSWORD_LENGTH+1);
-	     if (buff)
-	     {
-	       make_scrambled_password(buff,$4.str,use_old_passwords,
-				       &YYTHD->rand);
-	       $1->password.str=buff;
-	       $1->password.length=HASH_PASSWORD_LENGTH;
-	     }
+             if (use_old_passwords)
+             {
+               char *buff= 
+                 (char *) YYTHD->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH_323+1);
+               if (buff)
+                 make_scrambled_password_323(buff, $4.str);
+               $1->password.str= buff;
+               $1->password.length= SCRAMBLED_PASSWORD_CHAR_LENGTH_323;
+             }
+             else
+             {
+               char *buff= 
+                 (char *) YYTHD->alloc(SCRAMBLED_PASSWORD_CHAR_LENGTH+1);
+               if (buff)
+                 make_scrambled_password(buff, $4.str);
+               $1->password.str= buff;
+               $1->password.length= SCRAMBLED_PASSWORD_CHAR_LENGTH;
+             }
 	  }
 	}
 	| user IDENTIFIED_SYM BY PASSWORD TEXT_STRING