validate_password.h

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/* Copyright (c) 2017, 2023, 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, version 2.0,
as published by the Free Software Foundation.
 
This program is also distributed with certain software (including
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as designated in a particular file or component or in included license
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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, version 2.0, 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 02110-1301  USA */
 
#ifndef VALIDATE_PASSWORD_SERVICE_H
#define VALIDATE_PASSWORD_SERVICE_H
 
#include <mysql/components/service.h>
#include <mysql/components/services/mysql_string.h>
 
/**
  @ingroup group_components_services_inventory
 
  Interfaces to enforce a password policy.
 
  The policy is enfoced through two methods
  1) validate() that answers the question of whether this password is good
     enough or not.
 
  2) get_strength() that can be used by password changing UIs to display
     a password strength meter in the range of [0-100] as the user enters
     a password.
 
  @code
    REQUIRES_SERVICE(validate_password);
    bool validate_password(THD *thd, const char *password,
                           unsigned int password_length) {
      String password_string;
      password_string.set(password, password_length, &my_charset_utf8mb3_bin);
      if (mysql_service_validate_password->validate(thd, password_string)) {
        // Emit error that password does not adhere to policy criteria
        return true;
      }
      return false;
    }
 
    unsigned int get_password_strength(THD *thd, const char *password,
                                       unsigned int password_length) {
      String password_string;
      password_string.set(password, password_length, &my_charset_utf8mb3_bin);
      unsigned int strength = 0;
      if (mysql_service_validate_password->get_strength(thd, password_string,
                                                    &strength)) {
        return 0;
      }
      return strength;
    }
  @endcode
*/
BEGIN_SERVICE_DEFINITION(validate_password)
/**
  Checks if a password is valid by the password policy.
 
  @param thd MYSQL THD object
  @param password Given Password
  @return Status of performed operation
  @return false success (valid password)
  @return true failure (invalid password)
*/
DECLARE_BOOL_METHOD(validate, (void *thd, my_h_string password));
 
/**
  Calculates the strength of a password in the scale of 0 to 100.
 
  @param thd MYSQL THD object
  @param password Given Password
  @param [out] strength pointer to handle the strength of the given password.
               in the range of [0-100], where 0 is week password and
               100 is strong password
  @return Status of performed operation
  @return false success
  @return true failure
*/
DECLARE_BOOL_METHOD(get_strength,
                    (void *thd, my_h_string password, unsigned int *strength));
 
END_SERVICE_DEFINITION(validate_password)
 
/**
  @ingroup group_components_services_inventory
 
  Service to enforce that new password contains N different characters
  compared to existing password.
 
  @code
  REQUIRES_SERVICE(validate_password_changed_characters)
  bool compare_passwords(const char *current_password,
                         unsigned int current_password_length,
                         const char * new_oassword,
                         unsigned int new_password_length) {
    String current_password_string, new_password_string;
    current_password_string.assign(current_password, current_password_length,
                                   &my_charset_utf8mb3_bin);
    new_password_string.assign(new_password, new_password_length,
                               &my_charset_utf8mb3_bin);
    unsigned int min_required = 0, changed = 0;
    if (mysql_service_validate_password_changed_characters->validate(
          current_password_string, new_password_string,
          &min_required, &changed)) {
      // Raise error that min_required characters should be changed
      return true;
    }
    return false;
  }
  @endcode
*/
 
BEGIN_SERVICE_DEFINITION(validate_password_changed_characters)
 
/**
  Validate if number of changed characters matches the pre-configured
  criteria
 
  @param [in]  current_password Current password
  @param [in]  new_password     New password
  @param [out] minimum_required Minimum required number of changed characters
  @param [out] changed          Actual number of changed characters
 
  @returns Result of validation
    @retval false Success
        @retval true  Error
*/
DECLARE_BOOL_METHOD(validate,
                    (my_h_string current_password, my_h_string new_password,
                     uint *minimum_required, uint *changed));
 
END_SERVICE_DEFINITION(validate_password_changed_characters)
 
#endif /* VALIDATE_PASSWORD_SERVICE_H */