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4.3 NetrJoinDomain2 Example

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In this example, "SrvrA" is a machine that is not joined to a domain, and there exists a domain with the name "DomainA" and a domain controller of that domain named "DC-A".

A client calls the NetrJoinDomain2 method (section 3.2.4.13) on the server named "SrvrA":

 unsigned long NetrJoinDomain2(
    [in] handle_t RpcBindingHandle,
    [in, string, unique] wchar_t* ServerName = { "SrvrA" },
    [in, string] wchar_t* DomainName = { "DomainA\DC-A" },
    [in, string, unique] wchar_t* MachineAccountOU = { NULL },
    [in, string, unique] wchar_t* AccountName = { NULL },
    [in, unique] PJOINPR_ENCRYPTED_USER_PASSWORD Password = { NULL },
    [in] unsigned long Options = { 0x00000001 }
 );

Upon receiving this message, "SrvrA" establishes an SMB session with the domain controller "DC-A", using the credentials presented. In this example, there are no credentials; therefore the session is established as an anonymous session.

The server then queries for the domain_name and security identifier (SID) properties of "DC-A", and stores them locally.

As a last step, "SrvrA" creates a domain-object ([MS-ADTS] section 6.4.2) for itself, and sets the following attributes:

  • sAMAccountName

  • userAccountControl

  • unicodePwd

  • dNSHostName

  • servicePrincipalName

The server then responds to the client with the following message:

 unsigned long = { 0 }
 NetrJoinDomain2(
    [in] handle_t RpcBindingHandle,
    [in, string, unique] wchar_t* ServerName,
    [in, string] wchar_t* DomainName,
    [in, string, unique] wchar_t* MachineAccountOU,
    [in, string, unique] wchar_t* AccountName,
    [in, unique] PJOINPR_ENCRYPTED_USER_PASSWORD Password,
    [in] unsigned long Options
 );

The following sequence diagram shows the sequence of messages that can be exchanged as a result of a NetrJoinDomain2 message sent to the server.

NetrJoinDomain2 sequence

Figure 6: NetrJoinDomain2 sequence

The following state changes occur as a part of this message:

  • Initial states:

    SrvrA

    DC-A

    DomainNameNetBIOS = "Workgroup".

    DomainSID = NULL.

    Domain-Secret-Value = NULL.

    DomainNameNetBIOS = "DomainA".

    DomainSID = { SID-Value}.

  • End states:

    SrvrA

    DC-A

    DomainNameNetBIOS = "DomainA".

    DomainSID = {SID-Value}.

    Domain-Secret-Value = { domain-secret }.

    DomainNameNetBIOS = "DomainA".

    DomainSID = { SID-Value }.

    A computer account object exists with the following LDAP attributes:

    • userAccountControl = USER_WORKSTATION_TRUST_ACCOUNT.

    • samAccountName = "SrvrA$".

    • unicodePwd = { domain-secret }.

    • dNSHostName = "SrvrA.<DomainA-DNS-Name>.

    • servicePrincipalName = {

      "HOST/SrvrA",

      "HOST/SrvrA.<DomainA-DNS-Name>"

      }