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## Distro
Fedora 31
## GSSAPI Impl
Kerberos 5 release 1.18.1 with gss-ntlmssp 0.9.0
## Connection Info:
Connecting to host using FQDN but an invalid SPN. Using explicit credentials with the SPNEGO OID.
## Notes
* GSSAPI will automatically fallback to NTLM if it's unable to get a credential for Kerberos (SPN was invalid)
* No error message is reported saying the SPN is invalid, just auto fallback
* The mechTypes of the SPNEGO token contains just NTLMSSP as expected
* The server responds with the SPNEGO token that wraps the NTLM challenge
* The NTLM authenticate message from the client still includes the MIC in the NTLM token but also
* The mechListMIC on the SPNEGO part is defined
* `negState: ACCEPT_INCOMPLETE (1)` is set even though the context is established
* In a pure NTLM exchange there's no reply from the server after the authenticate message but with SPNEGO it replies with
* `negState: ACCEPT_COMPLETE (0)`
* No response token back
* `mechListMIC` is defined and presumable the client validates to ensure it is correct
Differences between Kerberos and NTLM in SPNEGO
* Kerberos does not set `mechListMIC` where NTLM does, maybe because it's only done over 1 message which includes the `mechTypes` list.
Will need to read [RFC 4178 Section 5.](https://www.rfc-editor.org/rfc/rfc4178.html#section-5) a bit closer to figure
out when and how `mechListMIC` is calculated.
## Tokens
```yaml
MessageType: SPNEGO InitialContextToken
Data:
thisMech: SPNEGO (1.3.6.1.5.5.2)
innerContextToken:
MessageType: SPNEGO NegTokenInit
Data:
mechTypes:
- NTLM (1.3.6.1.4.1.311.2.2.10)
reqFlags:
mechToken:
MessageType: NEGOTIATE_MESSAGE (1)
Data:
NegotiateFlags:
raw: 3758654007
flags:
- NTLMSSP_NEGOTIATE_56 (2147483648)
- NTLMSSP_NEGOTIATE_KEY_EXCH (1073741824)
- NTLMSSP_NEGOTIATE_128 (536870912)
- NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY (524288)
- NTLMSSP_NEGOTIATE_ALWAYS_SIGN (32768)
- NTLMSSP_NEGOTIATE_NTLM (512)
- NTLMSSP_NEGOTIATE_SEAL (32)
- NTLMSSP_NEGOTIATE_SIGN (16)
- NTLMSSP_REQUEST_TARGET (4)
- NTLMSSP_NEGOTIATE_OEM (2)
- NTLMSSP_NEGOTIATE_UNICODE (1)
DomainNameFields:
Len: 0
MaxLen: 0
BufferOffset: 0
WorkstationFields:
Len: 0
MaxLen: 0
BufferOffset: 0
Version:
Payload:
DomainName:
Workstation:
RawData: 4E544C4D5353500001000000378208E000000000000000000000000000000000
mechListMIC:
RawData: A0363034A00E300C060A2B06010401823702020AA22204204E544C4D5353500001000000378208E000000000000000000000000000000000
RawData: 604006062B0601050502A0363034A00E300C060A2B06010401823702020AA22204204E544C4D5353500001000000378208E000000000000000000000000000000000
```
```yaml
MessageType: SPNEGO NegTokenResp
Data:
negState: accept-incomplete (1)
supportedMech: NTLM (1.3.6.1.4.1.311.2.2.10)
responseToken:
MessageType: CHALLENGE_MESSAGE (2)
Data:
TargetNameFields:
Len: 12
MaxLen: 12
BufferOffset: 56
NegotiateFlags:
raw: 3800662581
flags:
- NTLMSSP_NEGOTIATE_56 (2147483648)
- NTLMSSP_NEGOTIATE_KEY_EXCH (1073741824)
- NTLMSSP_NEGOTIATE_128 (536870912)
- NTLMSSP_NEGOTIATE_VERSION (33554432)
- NTLMSSP_NEGOTIATE_TARGET_INFO (8388608)
- NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY (524288)
- NTLMSSP_TARGET_TYPE_DOMAIN (65536)
- NTLMSSP_NEGOTIATE_ALWAYS_SIGN (32768)
- NTLMSSP_NEGOTIATE_NTLM (512)
- NTLMSSP_NEGOTIATE_SEAL (32)
- NTLMSSP_NEGOTIATE_SIGN (16)
- NTLMSSP_REQUEST_TARGET (4)
- NTLMSSP_NEGOTIATE_UNICODE (1)
ServerChallenge: 8FD9D6108FAB584E
Reserved: '0000000000000000'
TargetInfoFields:
Len: 138
MaxLen: 138
BufferOffset: 68
Version:
Major: 10
Minor: 0
Build: 14393
Reserved: '000000'
NTLMRevision: 15
Payload:
TargetName: DOMAIN
TargetInfo:
- AvId: MSV_AV_NB_DOMAIN_NAME (2)
Value: DOMAIN
- AvId: MSV_AV_NB_COMPUTER_NAME (1)
Value: DC01
- AvId: MSV_AV_DNS_DOMAIN_NAME (4)
Value: domain.local
- AvId: MSV_AV_DNS_COMPUTER_NAME (3)
Value: DC01.domain.local
- AvId: MSV_AV_DNS_TREE_NAME (5)
Value: domain.local
- AvId: MSV_AV_TIMESTAMP (7)
Value: '2020-04-30T01:29:30.8203214Z'
- AvId: MSV_AV_EOL (0)
Value:
RawData: 4E544C4D53535000020000000C000C0038000000358289E28FD9D6108FAB584E00000000000000008A008A00440000000A0039380000000F44004F004D00410049004E0002000C0044004F004D00410049004E000100080044004300300031000400180064006F006D00610069006E002E006C006F00630061006C000300220044004300300031002E0064006F006D00610069006E002E006C006F00630061006C000500180064006F006D00610069006E002E006C006F00630061006C0007000800CE24D9CB8E1ED60100000000
mechListMIC:
RawData: A181EA3081E7A0030A0101A10C060A2B06010401823702020AA281D10481CE4E544C4D53535000020000000C000C0038000000358289E28FD9D6108FAB584E00000000000000008A008A00440000000A0039380000000F44004F004D00410049004E0002000C0044004F004D00410049004E000100080044004300300031000400180064006F006D00610069006E002E006C006F00630061006C000300220044004300300031002E0064006F006D00610069006E002E006C006F00630061006C000500180064006F006D00610069006E002E006C006F00630061006C0007000800CE24D9CB8E1ED60100000000
```
```yaml
MessageType: SPNEGO NegTokenResp
Data:
negState: accept-incomplete (1)
supportedMech:
responseToken:
MessageType: AUTHENTICATE_MESSAGE (3)
Data:
LmChallengeResponseFields:
Len: 0
MaxLen: 0
BufferOffset: 88
NtChallengeResponseFields:
Len: 226
MaxLen: 226
BufferOffset: 88
DomainNameFields:
Len: 0
MaxLen: 0
BufferOffset: 0
UserNameFields:
Len: 54
MaxLen: 54
BufferOffset: 314
WorkstationFields:
Len: 26
MaxLen: 26
BufferOffset: 368
EncryptedRandomSessionKeyFields:
Len: 16
MaxLen: 16
BufferOffset: 394
NegotiateFlags:
raw: 3800662581
flags:
- NTLMSSP_NEGOTIATE_56 (2147483648)
- NTLMSSP_NEGOTIATE_KEY_EXCH (1073741824)
- NTLMSSP_NEGOTIATE_128 (536870912)
- NTLMSSP_NEGOTIATE_VERSION (33554432)
- NTLMSSP_NEGOTIATE_TARGET_INFO (8388608)
- NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY (524288)
- NTLMSSP_TARGET_TYPE_DOMAIN (65536)
- NTLMSSP_NEGOTIATE_ALWAYS_SIGN (32768)
- NTLMSSP_NEGOTIATE_NTLM (512)
- NTLMSSP_NEGOTIATE_SEAL (32)
- NTLMSSP_NEGOTIATE_SIGN (16)
- NTLMSSP_REQUEST_TARGET (4)
- NTLMSSP_NEGOTIATE_UNICODE (1)
Version:
Major: 6
Minor: 2
Build: 0
Reserved: '000000'
NTLMRevision: 15
MIC: 6F0D4927864BC3CB9CA7DC86C2589C39
Payload:
LmChallengeResponse:
NtChallengeResponse:
ResponseType: NTLMv2
NTProofStr: C7DD497FA75911AF821616F1E7642763
ClientChallenge:
RespType: 1
HiRespType: 1
Reserved1: 0
Reserved2: 0
TimeStamp: '2020-04-30T01:29:30.8203214Z'
ChallengeFromClient: DA0BDE87F9D1C301
Reserved3: 0
AvPairs:
- AvId: MSV_AV_NB_COMPUTER_NAME (1)
Value: DC01
- AvId: MSV_AV_NB_DOMAIN_NAME (2)
Value: DOMAIN
- AvId: MSV_AV_DNS_COMPUTER_NAME (3)
Value: DC01.domain.local
- AvId: MSV_AV_DNS_DOMAIN_NAME (4)
Value: domain.local
- AvId: MSV_AV_DNS_TREE_NAME (5)
Value: domain.local
- AvId: MSV_AV_FLAGS (6)
Value:
raw: 2
flags:
- MIC_PROVIDED (2)
- AvId: MSV_AV_TIMESTAMP (7)
Value: '2020-04-30T01:29:30.8203214Z'
- AvId: MSV_AV_TARGET_NAME (9)
Value: test
- AvId: MSV_AV_CHANNEL_BINDINGS (10)
Value: '00000000000000000000000000000000'
- AvId: MSV_AV_EOL (0)
Value:
Reserved4: 0
DomainName:
UserName: vagrant-domain@DOMAIN.LOCAL
Workstation: JBOREAN-LINUX
EncryptedRandomSessionKey: F451F93F20470A1939A380C09FE4AEED
SessionKey: 3DF3B0EF6C5D823F0F75885B6270FD1D
RawData: 4E544C4D53535000030000000000000058000000E200E200580000000000000000000000360036003A0100001A001A0070010000100010008A010000358289E2060200000000000F6F0D4927864BC3CB9CA7DC86C2589C39C7DD497FA75911AF821616F1E76427630101000000000000CE24D9CB8E1ED601DA0BDE87F9D1C3010000000001000800440043003000310002000C0044004F004D00410049004E000300220044004300300031002E0064006F006D00610069006E002E006C006F00630061006C000400180064006F006D00610069006E002E006C006F00630061006C000500180064006F006D00610069006E002E006C006F00630061006C00060004000200000007000800CE24D9CB8E1ED6010900080074006500730074000A001000000000000000000000000000000000000000000000000000760061006700720061006E0074002D0064006F006D00610069006E00400044004F004D00410049004E002E004C004F00430041004C004A0042004F005200450041004E002D004C0049004E0055005800F451F93F20470A1939A380C09FE4AEED
mechListMIC: 0100000041EDFFBEC271373700000000
RawData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
```
```yaml
MessageType: SPNEGO NegTokenResp
Data:
negState: accept-complete (0)
supportedMech:
responseToken:
mechListMIC: 010000002A5E5500123F381800000000
RawData: A11B3019A0030A0100A3120410010000002A5E5500123F381800000000
```
|
