2.2.1 IMAP4 NTLM Extension Messages

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The IMAP4 NTLM extension extends both the IMAP4 AUTHENTICATE command requests and responses and the IMAP4 CAPABILITY command responses. The AUTHENTICATE command extensibility framework is specified in [RFC1731].

Message syntax is shown in Augmented Backus-Naur Form (ABNF), as specified in [RFC5234]. The ABNF rules specified here extend the ABNF rules specified in [RFC3501] section 9. All human readable strings are arbitrary and do not affect protocol functionality.

 IMAP4_AUTHENTICATE_NTLM_Initiation_Command    = tag "AUTHENTICATE NTLM" CRLF
 IMAP4_AUTHENTICATE_NTLM_Supported_Response    = "+" CRLF
 IMAP4_AUTHENTICATE_NTLM_Unsupported_Response  = tag "BAD" text CRLF
 IMAP4_AUTHENTICATE_NTLM_Cancellation_Command  = "*" SP CRLF
 IMAP4_AUTHENTICATE_NTLM_Cancelled_Response    = tag "NO The AUTH protocol exchange was
                                                 canceled by the client." CRLF
 IMAP4_AUTHENTICATE_NTLM_Blob_Command          = base64-encoded-NTLM-Message CRLF
 IMAP4_AUTHENTICATE_NTLM_Blob_Response         = "+" SP base64-encoded-NTLM-Message CRLF
 IMAP4_AUTHENTICATE_NTLM_Succeeded_Response    = tag OK "AUTHENTICATE completed." CRLF
 IMAP4_AUTHENTICATE_NTLM_Fail_Response         = tag "NO" text CRLF