1 files changed, 117 insertions, 0 deletions
diff --git a/plugin/simple_password_check/simple_password_check.c b/plugin/simple_password_check/simple_password_check.c
new file mode 100644
index 00000000..65d017e2
--- /dev/null
+++ b/plugin/simple_password_check/simple_password_check.c
@@ -0,0 +1,117 @@
+/* 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)
+{
+  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)
+    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++;
+  }
+  /* 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;