Mysql login exceptions

[wchen-r7]

This add more exception handling for the mysql_login function. Related to the following ticket:
http://dev.metasploit.com/redmine/issues/7668

Tested on the following:

Demo for mysql_hashdump:

msf  auxiliary(mysql_hashdump) > run

[+] Saving HashString as Loot: root:*[----------------Removed---------------]
[+] Saving HashString as Loot: root:*[----------------Removed---------------]
[+] Saving HashString as Loot: root:*[----------------Removed---------------]
[+] Saving HashString as Loot: debian-sys-maint:*[----------------Removed---------------]
[*] Hash Table has been saved: /Users/sinn3r/.msf4/loot/20130107161618_default_10.0.1.22_mysql.hashes_135309.txt
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Demo for mysql_login:

msf  auxiliary(mysql_login) > run

[*] 10.0.1.22:3306 MYSQL - Found remote MySQL version 5.1.66
[*] 10.0.1.22:3306 MYSQL - [1/1] - Trying username:'root' with password:'root'
[+] 10.0.1.22:3306 - SUCCESSFUL LOGIN 'root' : 'root'
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Demo for mysql_schemadump:

msf  auxiliary(mysql_schemadump) > run

[*] Schema stored in: /Users/sinn3r/.msf4/loot/20130107161907_default_10.0.1.22_mysql_schema_185685.txt
[+] MySQL Server Schema 
 Host: 10.0.1.22 
 Port: 3306 
 ====================

--- []

Demo for mysql_mof:

msf  exploit(mysql_mof) > exploit

[*] Started reverse handler on 10.0.1.3:4444 
[*] 10.0.1.10:3306 - Attempting to login as 'sa:blah'
[-] Access denied
[*] Exploit completed, but no session was created.

[jvazquez-r7]

Deleting this print_error results in the module exiting silently when login isn't possible unless VERBOSE = true:

msf  auxiliary(mysql_hashdump) > run

[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed
msf  auxiliary(mysql_hashdump) > set VERBOSE true
VERBOSE => true
msf  auxiliary(mysql_hashdump) > run

[-] Unable to login from this host due to policy
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

Not sure if this is the best approach (the module finishing silently on error and verbose = false)... awaiting for confirmation before merge.

[jvazquez-r7]

Looks better for me

msf  auxiliary(mysql_hashdump) > set RHOSTS 192.168.1.138
RHOSTS => 192.168.1.138
msf  auxiliary(mysql_hashdump) > run
[-] Unable to login from this host due to policy
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

merging!