4.2 POP3 Client Unsuccessfully Authenticating to a POP3 Server

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This section illustrates the NTLM POP3 Extension with a scenario in which a POP3 client attempts NTLM authentication to a POP3 server and the authentication fails.

Client unsuccessfully authenticating to POP3 server

Figure 5: Client unsuccessfully authenticating to POP3 server

1-3. The same as in section 4.1.

4. The server sends a POP3_AUTH_NTLM_Blob_Response message containing a base64-encoded NTLM CHALLENGE_MESSAGE.

 + TlRMTVNTUAACAAAAFAAUADgAAAAFgoqieUWd5ES4Bi0AAAAAAAAAAGQAZABMAA
 AABQLODgAAAA9UAEUAUwBUAFMARQBSAFYARQBSAAIAFABUAEUAUwBUAFMARQBSAF
 YARQBSAAEAFABUAEUAUwBUAFMARQBSAFYARQBSAAQAFABUAGUAcwB0AFMAZQByAH
 YAZQByAAMAFABUAGUAcwB0AFMAZQByAHYAZQByAAAAAAA=
  
 00000000:4e 54 4c 4d 53 53 50 00 02 00 00 00 14 00 14 00    NTLMSSP.........
 00000010:38 00 00 00 05 82 8a a2 79 45 9d e4 44 b8 06 2d    8....‚Š¢yE□äD¸.-
 00000020:00 00 00 00 00 00 00 00 64 00 64 00 4c 00 00 00    ........d.d.L...
 00000030:05 02 ce 0e 00 00 00 0f 54 00 45 00 53 00 54 00    ..Î.....T.E.S.T.
 00000040:53 00 45 00 52 00 56 00 45 00 52 00 02 00 14 00    S.E.R.V.E.R.....
 00000050:54 00 45 00 53 00 54 00 53 00 45 00 52 00 56 00    T.E.S.T.S.E.R.V.
 00000060:45 00 52 00 01 00 14 00 54 00 45 00 53 00 54 00    E.R.....T.E.S.T.
 00000070:53 00 45 00 52 00 56 00 45 00 52 00 04 00 14 00    S.E.R.V.E.R.....
 00000080:54 00 65 00 73 00 74 00 53 00 65 00 72 00 76 00    T.e.s.t.S.e.r.v.
 00000090:65 00 72 00 03 00 14 00 54 00 65 00 73 00 74 00    e.r.....T.e.s.t.
 000000a0:53 00 65 00 72 00 76 00 65 00 72 00 00 00 00 00    S.e.r.v.e.r.....

5. The client sends a POP3_AUTH_NTLM_Blob_Command message containing a base-64-encoded NTLM AUTHENTICATE_MESSAGE.

 TlRMTVNTUAADAAAAGAAYAGIAAAAYABgAegAAAAAAAABIAAAACAAIAEgAAAASABIA
 UAAAAAAAAACSAAAABYKIogUBKAoAAAAPdQBzAGUAcgBOAEYALQBDAEwASQBFAE4A
 VAAOarJ6lZ5ZNwAAAAAAAAAAAAAAAAAAAACD9mD8jmWs4FkZe59/nNb1cF2HkL0C
 GZw=
 00000000:4e 54 4c 4d 53 53 50 00 03 00 00 00 18 00 18 00    NTLMSSP.........
 00000010:62 00 00 00 18 00 18 00 7a 00 00 00 00 00 00 00    b.......z.......
 00000020:48 00 00 00 08 00 08 00 48 00 00 00 12 00 12 00    H.......H.......
 00000030:50 00 00 00 00 00 00 00 92 00 00 00 05 82 88 a2    P.......'....‚ˆ¢
 00000040:05 01 28 0a 00 00 00 0f 75 00 73 00 65 00 72 00    ..(.....u.s.e.r.
 00000050:4e 00 46 00 2d 00 43 00 4c 00 49 00 45 00 4e 00    N.F.-.C.L.I.E.N.
 00000060:54 00 0e 6a b2 7a 95 9e 59 37 00 00 00 00 00 00    T..j²z•žY7......
 00000070:00 00 00 00 00 00 00 00 00 00 83 f6 60 fc 8e 65    ..........ƒö`üŽe
 00000080:ac e0 59 19 7b 9f 7f 9c d6 f5 70 5d 87 90 bd 02    ¬àY.{ŸœÖõp]‡□½.
 00000090:19 9c                                              .œ             

6. The server sends a POP3_AUTH_NTLM_Fail_Response message.

 -ERR Command not valid