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/* Copyright (c) 2014, Sergei Golubchik and MariaDB
Copyright (c) 2012, 2013, Oracle and/or its affiliates.
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; version 2 of the License.
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.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include <mysqld_error.h>
#include <my_attribute.h>
#include <mysql/plugin_password_validation.h>
#include <ctype.h>
#include <string.h>
static unsigned min_length, min_digits, min_letters, min_others;
static int validate(const MYSQL_CONST_LEX_STRING *username,
const MYSQL_CONST_LEX_STRING *password,
const MYSQL_CONST_LEX_STRING *hostname
__attribute__((unused)))
{
unsigned digits=0 , uppers=0 , lowers=0, others=0, length= (unsigned)password->length;
const char *ptr= password->str, *end= ptr + length;
if (strncmp(password->str, username->str, length) == 0)
{
// warning used to do not change error code
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: The password equal to the user name",
ME_WARNING);
return 1;
}
/* everything non-ascii is the "other" character and is good for the password */
for(; ptr < end; ptr++)
{
if (isdigit(*ptr))
digits++;
else if (isupper(*ptr))
uppers++;
else if (islower(*ptr))
lowers++;
else
others++;
}
// warnings used to do not change error code
if (length < min_length)
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: Too short password (< %u)",
ME_WARNING, min_length);
if (uppers < min_letters)
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: Not enough upper case "
"letters (< %u)",ME_WARNING, min_letters);
if (lowers < min_letters)
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: Not enough lower case "
"letters (< %u)",ME_WARNING, min_letters);
if (digits < min_digits)
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: Not enough digits (< %u)",
ME_WARNING, min_digits);
if (others < min_others)
my_printf_error(ER_NOT_VALID_PASSWORD,
"simple_password_check: Not enough special "
"characters (< %u)",ME_WARNING, min_others);
/* remember TRUE means the password failed the validation */
return length < min_length ||
uppers < min_letters ||
lowers < min_letters ||
digits < min_digits ||
others < min_others;
}
static void fix_min_length(MYSQL_THD thd __attribute__((unused)),
struct st_mysql_sys_var *var
__attribute__((unused)),
void *var_ptr, const void *save)
{
unsigned int new_min_length;
*((unsigned int *)var_ptr)= *((unsigned int *)save);
new_min_length= min_digits + 2 * min_letters + min_others;
if (min_length < new_min_length)
{
my_printf_error(ER_TRUNCATED_WRONG_VALUE,
"Adjusted the value of simple_password_check_minimal_length "
"from %u to %u", ME_WARNING, min_length, new_min_length);
min_length= new_min_length;
}
}
static MYSQL_SYSVAR_UINT(minimal_length, min_length, PLUGIN_VAR_RQCMDARG,
"Minimal required password length", NULL, fix_min_length, 8, 0, 1000, 1);
static MYSQL_SYSVAR_UINT(digits, min_digits, PLUGIN_VAR_RQCMDARG,
"Minimal required number of digits", NULL, fix_min_length, 1, 0, 1000, 1);
static MYSQL_SYSVAR_UINT(letters_same_case, min_letters, PLUGIN_VAR_RQCMDARG,
"Minimal required number of letters of the same letter case."
"This limit is applied separately to upper-case and lower-case letters",
NULL, fix_min_length, 1, 0, 1000, 1);
static MYSQL_SYSVAR_UINT(other_characters, min_others, PLUGIN_VAR_RQCMDARG,
"Minimal required number of other (not letters or digits) characters",
NULL, fix_min_length, 1, 0, 1000, 1);
static struct st_mysql_sys_var* sysvars[]= {
MYSQL_SYSVAR(minimal_length),
MYSQL_SYSVAR(digits),
MYSQL_SYSVAR(letters_same_case),
MYSQL_SYSVAR(other_characters),
NULL
};
static struct st_mariadb_password_validation info=
{
MariaDB_PASSWORD_VALIDATION_INTERFACE_VERSION,
validate
};
maria_declare_plugin(simple_password_check)
{
MariaDB_PASSWORD_VALIDATION_PLUGIN,
&info,
"simple_password_check",
"Sergei Golubchik",
"Simple password strength checks",
PLUGIN_LICENSE_GPL,
NULL,
NULL,
0x0100,
NULL,
sysvars,
"1.0",
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
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