bk commit into 5.2 tree (markleith:1.2598) BUG#25822

[Mark Leith]

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ChangeSet@stripped, 2007-09-03 23:18:50+01:00, markleith@stripped +1 -0
  Bug#25822 / WL#3953 - Log Access Denied errors for bad passwords in the error log
  
  Added logging of Access Denied messages on failed new connections to the 
  error log when log-warnings = 2.
  
  This allows a user to log these messages without having to incur the overhead
  of using the general query log on production systems.

  sql/sql_connect.cc@stripped, 2007-09-03 23:18:44+01:00, markleith@stripped +12 -0
    Added logging of Access Denied messages to error log when log-warnings=2

diff -Nrup a/sql/sql_connect.cc b/sql/sql_connect.cc
--- a/sql/sql_connect.cc	2007-07-30 09:33:44 +01:00
+++ b/sql/sql_connect.cc	2007-09-03 23:18:44 +01:00
@@ -502,6 +502,18 @@ int check_user(THD *thd, enum enum_serve
                     thd->main_security_ctx.user,
                     thd->main_security_ctx.host_or_ip,
                     passwd_len ? ER(ER_YES) : ER(ER_NO));
+  /* 
+    log access denied messages to the error log when log-warnings = 2
+    so that the overhead of the general query log is not required to track 
+    failed connections 
+  */
+  if (global_system_variables.log_warnings > 1)
+  {
+    sql_print_warning(ER(ER_ACCESS_DENIED_ERROR),
+                      thd->main_security_ctx.user,
+                      thd->main_security_ctx.host_or_ip,
+                      passwd_len ? ER(ER_YES) : ER(ER_NO));      
+  }
   DBUG_RETURN(-1);
 #endif /* NO_EMBEDDED_ACCESS_CHECKS */
 }