Fixed BUG#2777: Stored procedure doesn't observe definer's rights.

SQL SECURITY DEFINER must enforce reduced rights too, not just additional rights.


mysql-test/r/sp-security.result:
  Test case for BUG#2777: Make sure that SQL SECURITY DEFINER enforces reduced rights.
mysql-test/t/sp-security.test:
  Test case for BUG#2777: Make sure that SQL SECURITY DEFINER enforces reduced rights.
sql/sql_acl.cc:
  Clear rights before changing them in acl_getroot_no_password so that
  reduced rights work too, and take care of db acls as well.

mysql-test/r/sp-security.result

 use test;
-grant usage on *.* to dummy@localhost;
+grant usage on *.* to user1@localhost;
+flush privileges;
 drop database if exists db1_secret;
 create database db1_secret;
 use db1_secret;
@@ -15,14 +16,14 @@ u	i
 root@localhost	1
 call stamp(2);
 select * from db1_secret.t1;
-ERROR 42000: Access denied for user: 'dummy'@'localhost' to database 'db1_secret'
+ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db1_secret'
 call stamp(3);
 select * from db1_secret.t1;
 ERROR 42000: Access denied for user: ''@'localhost' to database 'db1_secret'
 select * from t1;
 u	i
 root@localhost	1
-dummy@localhost	2
+user1@localhost	2
 anon@localhost	3
 alter procedure stamp sql security invoker;
 show procedure status like 'stamp';
@@ -32,14 +33,50 @@ call stamp(4);
 select * from t1;
 u	i
 root@localhost	1
-dummy@localhost	2
+user1@localhost	2
 anon@localhost	3
 root@localhost	4
 call stamp(5);
-ERROR 42000: Access denied for user: 'dummy'@'localhost' to database 'db1_secret'
+ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db1_secret'
 call stamp(6);
 ERROR 42000: Access denied for user: ''@'localhost' to database 'db1_secret'
+drop database if exists db2;
+create database db2;
+use db2;
+create table t2 (s1 int);
+insert into t2 values (0);
+grant usage on db2.* to user1@localhost;
+grant select on db2.* to user1@localhost;
+grant usage on db2.* to user2@localhost;
+grant select,insert,update,delete on db2.* to user2@localhost;
+flush privileges;
+use db2;
+create procedure p () insert into t2 values (1);
+call p();
+ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db2'
+use db2;
+call p();
+ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db2'
+select * from t2;
+s1
+0
+create procedure q () insert into t2 values (2);
+call q();
+select * from t2;
+s1
+0
+2
+use db2;
+call q();
+select * from t2;
+s1
+0
+2
+2
 drop procedure stamp;
+drop procedure p;
+drop procedure q;
 use test;
 drop database db1_secret;
-delete from mysql.user where user='dummy';
+drop database db2;
+delete from mysql.user where user='user1' or user='user2';

mysql-test/t/sp-security.test

@@ -7,8 +7,9 @@ connect (con1root,localhost,root,,);
 connection con1root;
 use test;
 
-# Create dummy user with no particular access rights
-grant usage on *.* to dummy@localhost;
+# Create user user1 with no particular access rights
+grant usage on *.* to user1@localhost;
+flush privileges;
 
 --disable_warnings
 drop database if exists db1_secret;
@@ -30,13 +31,13 @@ show procedure status like 'stamp';
 call stamp(1);
 select * from t1;
 
-connect (con2dummy,localhost,dummy,,);
+connect (con2user1,localhost,user1,,);
 connect (con3anon,localhost,anon,,);
 
 #
-# Dummy can
+# User1 can
 #
-connection con2dummy;
+connection con2user1;
 
 # This should work...
 call stamp(2);
@@ -75,9 +76,9 @@ call stamp(4);
 select * from t1;
 
 #
-# Dummy cannot
+# User1 cannot
 #
-connection con2dummy;
+connection con2user1;
 
 # This should not work
 --error 1044
@@ -92,9 +93,65 @@ connection con3anon;
 --error 1044
 call stamp(6);
 
+
+#
+# BUG#2777
+#
+
+connection con1root;
+--disable_warnings
+drop database if exists db2;
+--enable_warnings
+create database db2;
+
+use db2;
+
+create table t2 (s1 int);
+insert into t2 values (0);
+
+grant usage on db2.* to user1@localhost;
+grant select on db2.* to user1@localhost;
+grant usage on db2.* to user2@localhost;
+grant select,insert,update,delete on db2.* to user2@localhost;
+flush privileges;
+
+connection con2user1;
+use db2;
+
+create procedure p () insert into t2 values (1);
+
+# Check that this doesn't work.
+--error 1044
+call p();
+
+connect (con4user2,localhost,user2,,);
+
+connection con4user2;
+use db2;
+
+# This should not work, since p is executed with definer's (user1's) rights.
+--error 1044
+call p();
+select * from t2;
+
+create procedure q () insert into t2 values (2);
+
+call q();
+select * from t2;
+
+connection con2user1;
+use db2;
+
+# This should work
+call q();
+select * from t2;
+
 # Clean up
 connection con1root;
 drop procedure stamp;
+drop procedure p;
+drop procedure q;
 use test;
 drop database db1_secret;
-delete from mysql.user where user='dummy';
+drop database db2;
+delete from mysql.user where user='user1' or user='user2';

sql/sql_acl.cc

@@ -794,6 +794,7 @@ int acl_getroot_no_password(THD *thd)
 {
   ulong user_access= NO_ACCESS;
   int res= 1;
+  uint i;
   ACL_USER *acl_user= 0;
   DBUG_ENTER("acl_getroot_no_password");
 
@@ -810,13 +811,16 @@ int acl_getroot_no_password(THD *thd)
 
   VOID(pthread_mutex_lock(&acl_cache->lock));
 
+  thd->master_access= 0;
+  thd->db_access= 0;
+
   /*
      Find acl entry in user database.
      This is specially tailored to suit the check we do for CALL of
      a stored procedure; thd->user is set to what is actually a
      priv_user, which can be ''.
   */
-  for (uint i=0 ; i < acl_users.elements ; i++)
+  for (i=0 ; i < acl_users.elements ; i++)
   {
     acl_user= dynamic_element(&acl_users,i,ACL_USER*);
     if ((!acl_user->user && (!thd->user || !thd->user[0])) ||
@@ -832,6 +836,22 @@ int acl_getroot_no_password(THD *thd)
 
   if (acl_user)
   {
+    for (i=0 ; i < acl_dbs.elements ; i++)
+    {
+      ACL_DB *acl_db= dynamic_element(&acl_dbs, i, ACL_DB*);
+      if (!acl_db->user ||
+	  (thd->user && thd->user[0] && !strcmp(thd->user, acl_db->user)))
+      {
+	if (compare_hostname(&acl_db->host, thd->host, thd->ip))
+	{
+	  if (!acl_db->db || (thd->db && !strcmp(acl_db->db, thd->db)))
+	  {
+	    thd->db_access= acl_db->access;
+	    break;
+	  }
+	}
+      }
+    }
     thd->master_access= acl_user->access;
     thd->priv_user= acl_user->user ? thd->user : (char *) "";