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2.5 KERB_VALIDATION_INFO

The KERB_VALIDATION_INFO structure defines the user's logon and authorization information provided by the DC. A pointer to the KERB_VALIDATION_INFO structure is serialized into an array of bytes and then placed after the Buffers array of the topmost PACTYPE structure (section 2.3), at the offset specified in the Offset field of the corresponding PAC_INFO_BUFFER structure (section 2.4) in the Buffers array. The ulType field of the corresponding PAC_INFO_BUFFER structure is set to 0x00000001.

The KERB_VALIDATION_INFO structure is a subset of the NETLOGON_VALIDATION_SAM_INFO4 structure ([MS-NRPC] section 2.2.1.4.13). It is a subset due to historical reasons and to the use of the common Active Directory to generate this information. NTLM uses the NETLOGON_VALIDATION_SAM_INFO4 structure in the context of the server to domain controller exchange, as described in [MS-APDS] section 3.1. Consequently, the KERB_VALIDATION_INFO structure includes NTLM-specific fields. Fields that are common to the KERB_VALIDATION_INFO and the NETLOGON_VALIDATION_SAM_INFO4 structures, and which are specific to the NTLM authentication operation, are not used with [MS-KILE] authentication.

The KERB_VALIDATION_INFO structure is marshaled by RPC [MS-RPCE].

The KERB_VALIDATION_INFO structure is defined as follows:

typedef struct _KERB_VALIDATION_INFO {
  FILETIME LogonTime;
  FILETIME LogoffTime;
  FILETIME KickOffTime;
  FILETIME PasswordLastSet;
  FILETIME PasswordCanChange;
  FILETIME PasswordMustChange;
  RPC_UNICODE_STRING EffectiveName;
  RPC_UNICODE_STRING FullName;
  RPC_UNICODE_STRING LogonScript;
  RPC_UNICODE_STRING ProfilePath;
  RPC_UNICODE_STRING HomeDirectory;
  RPC_UNICODE_STRING HomeDirectoryDrive;
  USHORT LogonCount;
  USHORT BadPasswordCount;
  ULONG UserId;
  ULONG PrimaryGroupId;
  ULONG GroupCount;
  [size_is(GroupCount)] PGROUP_MEMBERSHIP GroupIds;
  ULONG UserFlags;
  USER_SESSION_KEY UserSessionKey;
  RPC_UNICODE_STRING LogonServer;
  RPC_UNICODE_STRING LogonDomainName;
  PISID LogonDomainId;
  ULONG Reserved1[2];
  ULONG UserAccountControl;
  ULONG SubAuthStatus;
  FILETIME LastSuccessfulILogon;
  FILETIME LastFailedILogon;
  ULONG FailedILogonCount;
  ULONG Reserved3;
  ULONG SidCount;
  [size_is(SidCount)] PKERB_SID_AND_ATTRIBUTES ExtraSids;
  PISID ResourceGroupDomainSid;
  ULONG ResourceGroupCount;
  [size_is(ResourceGroupCount)] PGROUP_MEMBERSHIP ResourceGroupIds;
} KERB_VALIDATION_INFO;

LogonTime: A FILETIME structure that contains the user account's lastLogon attribute ([MS-ADA1] section 2.351) value.

LogoffTime: A FILETIME structure that contains the time the client's logon session should expire. If the session should not expire, this structure SHOULD have the dwHighDateTime member set to 0x7FFFFFFF and the dwLowDateTime member set to 0xFFFFFFFF. A recipient of the PAC SHOULD<7> use this value as an indicator of when to warn the user that the allowed time is due to expire.

KickOffTime: A FILETIME structure that contains LogoffTime minus the user account's forceLogoff attribute ([MS-ADA1] section 2.233) value. If the client should not be logged off, this structure SHOULD have the dwHighDateTime member set to 0x7FFFFFFF and the dwLowDateTime member set to 0xFFFFFFFF. The Kerberos service ticket end time is a replacement for KickOffTime. The service ticket lifetime SHOULD NOT be set longer than the KickOffTime of an account. A recipient of the PAC SHOULD<8> use this value as the indicator of when the client should be forcibly disconnected.

PasswordLastSet: A FILETIME structure that contains the user account's pwdLastSet attribute ([MS-ADA3] section 2.175) value. If the password was never set, this structure MUST have the dwHighDateTime member set to 0x00000000 and the dwLowDateTime member set to 0x00000000.

PasswordCanChange: A FILETIME structure that contains the time at which the client's password is allowed to change. If there is no restriction on when the client may change the password, this member MUST be set to zero.

PasswordMustChange: A FILETIME structure that contains the time at which the client's password expires. If the password will not expire, this structure MUST have the dwHighDateTime member set to 0x7FFFFFFF and the dwLowDateTime member set to 0xFFFFFFFF.

EffectiveName: An RPC_UNICODE_STRING structure that contains the user account's samAccountName attribute ([MS-ADA3] section 2.222) value.

FullName: An RPC_UNICODE_STRING structure that contains the user account's full name for interactive logon and SHOULD be zero for network logon. If FullName is omitted, this member MUST contain an RPC_UNICODE_STRING structure with the Length member set to zero.

LogonScript: An RPC_UNICODE_STRING structure that contains the user account's scriptPath attribute ([MS-ADA3] section 2.232) value for interactive logon and SHOULD be zero for network logon. If no LogonScript is configured for the user, this member MUST contain an RPC_UNICODE_STRING structure with the Length member set to zero.

ProfilePath: An RPC_UNICODE_STRING structure that contains the user account's profilePath attribute ([MS-ADA3] section 2.167) value for interactive logon and SHOULD be zero for network logon. If no ProfilePath is configured for the user, this member MUST contain an RPC_UNICODE_STRING structure with the Length member set to zero.

HomeDirectory: An RPC_UNICODE_STRING structure that contains the user account's HomeDirectory attribute ([MS-ADA1] section 2.295) value for interactive logon and SHOULD be zero for network logon. If no HomeDirectory is configured for the user, this member MUST contain an RPC_UNICODE_STRING structure with the Length member set to zero.

HomeDirectoryDrive: An RPC_UNICODE_STRING structure that contains the user account's HomeDrive attribute ([MS-ADA1] section 2.296) value for interactive logon and SHOULD be zero for network logon . This member MUST be populated if HomeDirectory contains a UNC path. If no HomeDirectoryDrive is configured for the user, this member MUST contain an RPC_UNICODE_STRING structure with the Length member set to zero.

LogonCount: A 16-bit unsigned integer that contains the user account's LogonCount attribute ([MS-ADA1] section 2.375) value.

BadPasswordCount: A 16-bit unsigned integer that contains the user account's badPwdCount attribute ([MS-ADA1] section 2.83) value for interactive logon and SHOULD be zero for network logon.

UserId: A 32-bit unsigned integer that contains the RID of the account. If the UserId member equals 0x00000000, the first group SID in this member is the SID for this account.

PrimaryGroupId: A 32-bit unsigned integer that contains the RID for the primary group to which this account belongs.

GroupCount: A 32-bit unsigned integer that contains the number of groups within the account domain to which the account belongs.

GroupIds: A pointer to a list of GROUP_MEMBERSHIP (section 2.2.2) structures that contains the groups to which the account belongs in the account domain. The number of groups in this list MUST be equal to GroupCount.

UserFlags: A 32-bit unsigned integer that contains a set of bit flags that describe the user's logon information.


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The following flags are set only when this structure is created as the result of an NTLM authentication, as specified in [MS-NLMP]. These flags MUST be zero for any other authentication protocol, such as MS-KILE authentication.

Value Description

A

Authentication was done via the GUEST account; no password was used.

B

No encryption is available.

C

LAN Manager key was used for authentication.

E

Sub-authentication used; session key came from the sub-authentication package.

F

Indicates that the account is a machine account.

G

Indicates that the domain controller understands NTLMv2.

I

Indicates that ProfilePath is populated.

J

The NTLMv2 response from the NtChallengeResponseFields ([MS-NLMP] section 2.2.1.3) was used for authentication and session key generation.

K

The LMv2 response from the LmChallengeResponseFields ([MS-NLMP] section 2.2.1.3) was used for authentication and session key generation.

L

The LMv2 response from the LmChallengeResponseFields ([MS-NLMP] section 2.2.1.3) was used for authentication and the NTLMv2 response from the NtChallengeResponseFields ([MS-NLMP] section 2.2.1.3) was used session key generation.

The following flags are valid for MS-KILE authentications; settings depend on the configuration of the user and groups referenced in the PAC.

Value Description

D

Indicates that the ExtraSids field is populated and contains additional SIDs.

H

Indicates that the ResourceGroupIds field is populated.

All other bits MUST be set to zero and MUST be ignored on receipt.

UserSessionKey: A session key that is used for cryptographic operations on a session. This field is valid only when authentication is performed using NTLM. For any other protocol, this field MUST be zero.

LogonServer: An RPC_UNICODE_STRING structure that contains the NetBIOS name of the Kerberos KDC that performed the authentication server (AS) ticket request.

LogonDomainName: An RPC_UNICODE_STRING structure that contains the NetBIOS name of the domain to which this account belongs.

LogonDomainId: An RPC_SID structure that contains the SID for the domain specified in LogonDomainName. This member is used in conjunction with the UserId, PrimaryGroupId, and GroupIds members to create the user and group SIDs for the client.

Reserved1: A two-element array of unsigned 32-bit integers. This member is reserved, and each element of the array MUST be zero when sent and MUST be ignored on receipt.

UserAccountControl: A 32-bit unsigned integer that contains a set of bit flags that represent information about this account. This field carries the UserAccountControl information from the corresponding Security Account Manager field, as specified in [MS-SAMR].

SubAuthStatus: A 32-bit unsigned integer that contains the subauthentication package's ([MS-APDS] section 3.1.5.2.1) status code. If a subauthentication package is not used, this structure SHOULD be set to 0x00000000.

LastSuccessfulILogon: A FILETIME structure that contains the user account's msDS-LastSuccessfulInteractiveLogonTime ([MS-ADA2] section 2.342). If the user has never logged on, this structure SHOULD be set to 0x7FFFFFFFFFFFFFFF.

LastFailedILogon: A FILETIME structure that contains the user account's msDS-LastFailedInteractiveLogonTime ([MS-ADA2] section 2.340). If the user has never logged on, this structure SHOULD be set to 0x7FFFFFFFFFFFFFFF.

FailedILogonCount: A 32-bit unsigned integer that contains the user account's msDS-FailedInteractiveLogonCountAtLastSuccessfulLogon ([MS-ADA2] section 2.307).

Reserved3: A 32-bit integer. This member is reserved, and MUST be zero when sent and MUST be ignored on receipt.

SidCount: A 32-bit unsigned integer that contains the total number of SIDs present in the ExtraSids member. If this member is not zero then the D bit MUST be set in the UserFlags member.

ExtraSids: A pointer to a list of KERB_SID_AND_ATTRIBUTES (section 2.2.1) structures that contain a list of SIDs corresponding to groups in domains other than the account domain to which the principal belongs. This member is not NULL only if the D bit has been set in the UserFlags member. If the UserId member equals 0x00000000, the first group SID in this member is the SID for this account.

ResourceGroupDomainSid: An RPC_SID structure that contains the SID of the domain for the server whose resources the client is authenticating to. This member is used in conjunction with the ResourceGroupIds member to create the group SIDs for the user. If this member is populated, then the H bit MUST be set in the UserFlags member.

When this field is not used, it MUST be set to NULL.

ResourceGroupCount: A 32-bit unsigned integer that contains the number of resource group identifiers stored in ResourceGroupIds. If this member is not zero, then the H bit MUST be set in the UserFlags member.

When this field is not used, it MUST be set to zero.

ResourceGroupIds: A pointer to a list of GROUP_MEMBERSHIP structures that contain the RIDs and attributes of the account's groups in the resource domain. If this member is not NULL, then the H bit MUST be set in the UserFlags member.

When this field is not used, it MUST be set to NULL.

 
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