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DOMAIN_PASSWORD_INFORMATION structure (ntsecapi.h)

  • Article

The DOMAIN_PASSWORD_INFORMATION structure contains information about a domain's password policy, such as the minimum length for passwords and how unique passwords must be.

It is used in the MSV1_0_CHANGEPASSWORD_RESPONSE structure.

Syntax

typedef struct _DOMAIN_PASSWORD_INFORMATION {
  USHORT            MinPasswordLength;
  USHORT            PasswordHistoryLength;
  ULONG             PasswordProperties;
#if ...
  OLD_LARGE_INTEGER MaxPasswordAge;
#if ...
  OLD_LARGE_INTEGER MinPasswordAge;
#else
  LARGE_INTEGER     MaxPasswordAge;
#endif
#else
  LARGE_INTEGER     MinPasswordAge;
#endif
} DOMAIN_PASSWORD_INFORMATION, *PDOMAIN_PASSWORD_INFORMATION;

Members

MinPasswordLength

Specifies the minimum length, in characters, of a valid password.

PasswordHistoryLength

Indicates the number of previous passwords saved in the history list. A user cannot reuse a password in the history list.

PasswordProperties

Flags that describe the password properties. They can be one or more of the following values.

Value Meaning
DOMAIN_PASSWORD_COMPLEX
0x00000001L
 The password must have a mix of at least two of the following types of characters:
  • Uppercase characters
  • Lowercase characters
  • Numerals
DOMAIN_PASSWORD_NO_ANON_CHANGE
0x00000002L
 The password cannot be changed without logging on. Otherwise, if your password has expired, you can change your password and then log on.
DOMAIN_PASSWORD_NO_CLEAR_CHANGE
0x00000004L
 Forces the client to use a protocol that does not allow the domain controller to get the plaintext password.
DOMAIN_LOCKOUT_ADMINS
0x00000008L
 Allows the built-in administrator account to be locked out from network logons.
DOMAIN_PASSWORD_STORE_CLEARTEXT
0x00000010L
 The directory service is storing a plaintext password for all users instead of a hash function of the password.
DOMAIN_REFUSE_PASSWORD_CHANGE
0x00000020L
 Removes the requirement that the machine account password be automatically changed every week.

This value should not be used as it can weaken security.

MaxPasswordAge

Specifies the maximum length of time that a password can remain the same. Passwords older than this must be changed. Because SAM stores relative times as negative values and absolute times as positive numbers, the time is stored as a FILETIME structure with negative values.

The data type for this member is OLD_LARGE_INTEGER if MIDL_PASS is defined.

MinPasswordAge

Specifies the minimum length of time before a password can be changed. Because SAM stores relative times as negative values and absolute times as positive numbers, the time is stored as a FILETIME structure with negative values.

The data type for this member is OLD_LARGE_INTEGER if MIDL_PASS is defined.

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Header ntsecapi.h