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3.5.4.7.6 NetrServerGetTrustInfo (Opnum 46)

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The NetrServerGetTrustInfo method SHOULD<232> return an information block from a specified server. The information includes encrypted current and previous passwords for a particular account and additional trust data. The account name requested MUST be the name used when the secure channel was created, unless the method is called on a PDC by a domain controller, in which case it can be any valid account name. 

 NTSTATUS NetrServerGetTrustInfo(
   [in, unique, string] LOGONSRV_HANDLE TrustedDcName,
   [in, string] wchar_t* AccountName,
   [in] NETLOGON_SECURE_CHANNEL_TYPE SecureChannelType,
   [in, string] wchar_t* ComputerName,
   [in] PNETLOGON_AUTHENTICATOR Authenticator,
   [out] PNETLOGON_AUTHENTICATOR ReturnAuthenticator,
   [out] PENCRYPTED_NT_OWF_PASSWORD EncryptedNewOwfPassword,
   [out] PENCRYPTED_NT_OWF_PASSWORD EncryptedOldOwfPassword,
   [out] PNL_GENERIC_RPC_DATA* TrustInfo
 );

TrustedDcName: The custom binding handle, as defined in section 3.5.4.1.

AccountName: The null-terminated Unicode string that contains the name of the client account in the domain.

SecureChannelType: A NETLOGON_SECURE_CHANNEL_TYPE enumerated value, as specified in section 2.2.1.3.13, that indicates the type of the secure channel being established by this call.

ComputerName: The null-terminated Unicode string that contains the NetBIOS name of the client computer, for which the trust information MUST be returned.

Authenticator: A pointer to a NETLOGON_AUTHENTICATOR structure, as specified in section 2.2.1.1.5, that contains the client authenticator.

ReturnAuthenticator: A pointer to a NETLOGON_AUTHENTICATOR structure, as specified in section 2.2.1.1.5, that contains the server return authenticator.

EncryptedNewOwfPassword: A pointer to an ENCRYPTED_NT_OWF_PASSWORD structure, as specified in [MS-SAMR] section 2.2.7.3, that contains the NTOWFv1 (as specified in NTLM v1 Authentication in [MS-NLMP] section 3.3.1) of the current password, encrypted as specified in [MS-SAMR] section 2.2.11.1.1, Encrypting an NT Hash or LM Hash Value with a specified key. The session key is the specified 16-byte key that is used to derive its keys via the 16-byte value process, as specified in [MS-SAMR] section 2.2.11.1.4.

EncryptedOldOwfPassword: A pointer to an ENCRYPTED_NT_OWF_PASSWORD structure, as specified in [MS-SAMR] section 2.2.7.3, that contains the NTOWFv1 (as specified in NTLM v1 Authentication in [MS-NLMP] section 3.3.1) of the old password, encrypted as specified in [MS-SAMR] section 2.2.11.1.1, Encrypting an NT Hash or LM Hash Value with a specified key. The session key is the specified 16-byte key that is used to derive its keys via the 16-byte value process, as specified in [MS-SAMR] section 2.2.11.1.4.

TrustInfo: A pointer to an NL_GENERIC_RPC_DATA structure, as specified in section 2.2.1.6.4, that contains a block of generic RPC data with trust information for the specified server.

Return Values: The method returns 0x00000000 to indicate success; otherwise, it returns a nonzero error code.

On receiving this call, the server MUST perform the following validation steps:

  • Apply Common Error Processing Rule A, specified in section 3.

  • Using the ComputerName for the secure channel to find the corresponding record in the ClientSessionInfo table, verify the Authenticator parameter (section 3.1.4.5). If the Authenticator parameter is valid, compute the ReturnAuthenticator parameter returned (section 3.1.4.5). Otherwise, the server MUST return STATUS_ACCESS_DENIED.

If the TrustedDcName parameter is not NULL, it is compared against the server's computer name. If the TrustedDcName parameter does not match the server's computer name, or is NULL, then the server MUST return STATUS_INVALID_COMPUTER_NAME. If the TrustedDcName parameter matches the server's computer name, processing proceeds.

The server MUST retrieve the OWF of the current password for the account identified by the AccountName and SecureChannelType parameters. If the SecureChannelType is TrustedDnsDomainSecureChannel or TrustedDomainSecureChannel, then the SharedSecret of the trust will be used and the OWF of the previous password MUST also be retrieved. All other types of SecureChannelType require that the SharedSecret of the computer account be used, and that an empty string MUST be used when calculating the OWF of the previous password.

The NTOWFv1 of the current and previous passwords MUST be encrypted as specified in [MS-SAMR] section 2.2.11.1.1, Encrypting an NT Hash or LM Hash Value with a specified key. The session key is the specified 16-byte key used to derive its keys via the 16-byte value process, as specified in [MS-SAMR] section 2.2.11.1.4. The encrypted versions of the NTOWFv1 for the current password and previous password MUST be returned in the parameters EncryptedNewOwfPassword and EncryptedOldOwfPassword, respectively.

If the TrustInfo parameter is not NULL, the structure is generated by setting NL_GENERIC_RPC_DATA.UlongEntryCount to 1 and setting NL_GENERIC_RPC_DATA.UlongData to a 32-bit value that contains the trust attributes. The trust attributes themselves are defined in [MS-LSAD] section 2.2.7.9 as the TrustAttributes member, as part of the LSAPR_TRUSTED_DOMAIN_INFORMATION_EX structure.

This method SHOULD only be called by a machine that has established a secure channel with the server.