[Samba] Windows 2012 s4u2self followed by s4u2proxy fails against samba

Victor Buciuc victor.buciuc at gmail.com
Thu May 25 00:02:07 UTC 2017


Hi,

I hit the issue described in this thread
https://groups.google.com/forum/#!topic/linux.samba/VfjW9Af92Wg while
testing out s4u2self and s4u2proxy in a windows service, so I wanted
to share my setup.

So I wrote a small windows service that's running as a local system
account to impersonate an user via s4u2self (using LsaLogonUser in
win32 api than calling ImpersonateLoggedOnUser) and then access a file
on a shared disk. The file access fails with an "The user name or
password is incorrect." exception

in samba log I get:

[2017/05/24 22:07:39.010245,  3]
../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
  Kerberos: Failed to decrypt enc-authorization-data

looking at wireshark captures I can see the s4u2proxy request failing

S4U2Self Request

Frame 55: 1415 bytes on wire (11320 bits), 1415 bytes captured (11320
bits) on interface 0
    Interface id: 0 (\Device\NPF_{9B09F445-BC1D-4740-B31B-2DB084D5FEBD})
    Encapsulation type: Ethernet (1)
    Arrival Time: May 24, 2017 23:21:29.206358000 Coordinated Universal Time
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1495668089.206358000 seconds
    [Time delta from previous captured frame: 0.000053000 seconds]
    [Time delta from previous displayed frame: 0.000053000 seconds]
    [Time since reference or first frame: 4.793855000 seconds]
    Frame Number: 55
    Frame Length: 1415 bytes (11320 bits)
    Capture Length: 1415 bytes (11320 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:kerberos]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: PcsCompu_d8:25:31 (08:00:27:d8:25:31), Dst:
RealtekU_12:35:02 (52:54:00:12:35:02)
    Destination: RealtekU_12:35:02 (52:54:00:12:35:02)
        Address: RealtekU_12:35:02 (52:54:00:12:35:02)
        .... ..1. .... .... .... .... = LG bit: Locally administered
address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        Address: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 10.0.2.15, Dst: 192.168.50.4
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable
Transport (0)
    Total Length: 1401
    Identification: 0x0483 (1155)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (6)
    Header checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source: 10.0.2.15
    Destination: 192.168.50.4
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Transmission Control Protocol, Src Port: 50602, Dst Port: 88, Seq: 1,
Ack: 1, Len: 1361
    Source Port: 50602
    Destination Port: 88
    [Stream index: 4]
    [TCP Segment Len: 1361]
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 1362    (relative sequence number)]
    Acknowledgment number: 1    (relative ack number)
    Header Length: 20 bytes
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 64240
    [Calculated window size: 64240]
    [Window size scaling factor: -2 (no window scaling used)]
    Checksum: 0x0427 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    [SEQ/ACK analysis]
        [iRTT: 0.000305000 seconds]
        [Bytes in flight: 1361]
        [Bytes sent since last PSH flag: 1361]
    [PDU Size: 1361]
Kerberos
    Record Mark: 1357 bytes
        0... .... .... .... .... .... .... .... = Reserved: Not set
        .000 0000 0000 0000 0000 0101 0100 1101 = Record Length: 1357
    tgs-req
        pvno: 5
        msg-type: krb-tgs-req (12)
        padata: 2 items
            PA-DATA PA-TGS-REQ
                padata-type: kRB5-PADATA-TGS-REQ (1)
                    padata-value:
6e8204603082045ca003020105a10302010ea20703050000...
                        ap-req
                            pvno: 5
                            msg-type: krb-ap-req (14)
                            Padding: 0
                            ap-options: 00000000
                                0... .... = reserved: False
                                .0.. .... = use-session-key: False
                                ..0. .... = mutual-required: False
                            ticket
                                tkt-vno: 5
                                realm: TESTDOMAIN.LAN
                                sname
                                    name-type: kRB5-NT-SRV-INST (2)
                                    sname-string: 2 items
                                        SNameString: krbtgt
                                        SNameString: TESTDOMAIN.LAN
                                enc-part
                                    etype: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
                                    kvno: 1
                                    cipher:
133e0664961c5a187dc796b60203ab38d8049d5346a6e477...
                            authenticator
                                etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                                cipher:
9e090b164f219fca6776b32ea7b815944521218daf5b4879...
            PA-DATA PA-FOR-USER
                padata-type: kRB5-PADATA-S4U2SELF (129)
                    padata-value:
3052a0143012a00302010aa10b30091b0776627563697563...
                        name
                            name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
                            name-string: 1 item
                                KerberosString: vbuciuc
                        realm: TESTDOMAIN.LAN
                        cksum
                            cksumtype: cKSUMTYPE-HMAC-MD5 (-138)
                            checksum: f38a86cc453a82891d7c3a8e73906873
                        auth: Kerberos
        req-body
            Padding: 0
            kdc-options: 40810000 (forwardable, renewable, canonicalize)
                0... .... = reserved: False
                .1.. .... = forwardable: True
                ..0. .... = forwarded: False
                ...0 .... = proxiable: False
                .... 0... = proxy: False
                .... .0.. = allow-postdate: False
                .... ..0. = postdated: False
                .... ...0 = unused7: False
                1... .... = renewable: True
                .0.. .... = unused9: False
                ..0. .... = unused10: False
                ...0 .... = opt-hardware-auth: False
                .... ..0. = request-anonymous: False
                .... ...1 = canonicalize: True
                0... .... = constrained-delegation: False
                ..0. .... = disable-transited-check: False
                ...0 .... = renewable-ok: False
                .... 0... = enc-tkt-in-skey: False
                .... ..0. = renew: False
                .... ...0 = validate: False
            realm: TESTDOMAIN.LAN
            sname
                name-type: kRB5-NT-PRINCIPAL (1)
                sname-string: 1 item
                    SNameString: client$
            till: 2017-05-24 23:36:29 (UTC)
            nonce: 2037634744
            etype: 3 items
                ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
                ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
                ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)

Response:

Frame 57: 1308 bytes on wire (10464 bits), 1308 bytes captured (10464
bits) on interface 0
    Interface id: 0 (\Device\NPF_{9B09F445-BC1D-4740-B31B-2DB084D5FEBD})
    Encapsulation type: Ethernet (1)
    Arrival Time: May 24, 2017 23:21:29.212039000 Coordinated Universal Time
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1495668089.212039000 seconds
    [Time delta from previous captured frame: 0.005593000 seconds]
    [Time delta from previous displayed frame: 0.005593000 seconds]
    [Time since reference or first frame: 4.799536000 seconds]
    Frame Number: 57
    Frame Length: 1308 bytes (10464 bits)
    Capture Length: 1308 bytes (10464 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:kerberos]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: RealtekU_12:35:02 (52:54:00:12:35:02), Dst:
PcsCompu_d8:25:31 (08:00:27:d8:25:31)
    Destination: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        Address: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: RealtekU_12:35:02 (52:54:00:12:35:02)
        Address: RealtekU_12:35:02 (52:54:00:12:35:02)
        .... ..1. .... .... .... .... = LG bit: Locally administered
address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.50.4, Dst: 10.0.2.15
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable
Transport (0)
    Total Length: 1294
    Identification: 0x48a8 (18600)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x2e87 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.50.4
    Destination: 10.0.2.15
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Transmission Control Protocol, Src Port: 88, Dst Port: 50602, Seq: 1,
Ack: 1362, Len: 1254
    Source Port: 88
    Destination Port: 50602
    [Stream index: 4]
    [TCP Segment Len: 1254]
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 1255    (relative sequence number)]
    Acknowledgment number: 1362    (relative ack number)
    Header Length: 20 bytes
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 65535
    [Calculated window size: 65535]
    [Window size scaling factor: -2 (no window scaling used)]
    Checksum: 0xd5d8 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    [SEQ/ACK analysis]
        [iRTT: 0.000305000 seconds]
        [Bytes in flight: 1254]
        [Bytes sent since last PSH flag: 1254]
    [PDU Size: 1254]
Kerberos
    Record Mark: 1250 bytes
        0... .... .... .... .... .... .... .... = Reserved: Not set
        .000 0000 0000 0000 0000 0100 1110 0010 = Record Length: 1250
    tgs-rep
        pvno: 5
        msg-type: krb-tgs-rep (13)
        crealm: TESTDOMAIN.LAN
        cname
            name-type: kRB5-NT-ENTERPRISE-PRINCIPAL (10)
            cname-string: 1 item
                CNameString: vbuciuc
        ticket
            tkt-vno: 5
            realm: TESTDOMAIN.LAN
            sname
                name-type: kRB5-NT-PRINCIPAL (1)
                sname-string: 1 item
                    SNameString: client$
            enc-part
                etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                kvno: 2
                cipher: c0143bc2bc8b66aad128b507dee2ecf0f550179d65db208d...
        enc-part
            etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
            cipher: 8db3b981ecf31105c05a8e687d6b23572a91295e2133c43d...

Proxy request:

Frame 65: 2456 bytes on wire (19648 bits), 2456 bytes captured (19648
bits) on interface 0
    Interface id: 0 (\Device\NPF_{9B09F445-BC1D-4740-B31B-2DB084D5FEBD})
    Encapsulation type: Ethernet (1)
    Arrival Time: May 24, 2017 23:21:29.251646000 Coordinated Universal Time
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1495668089.251646000 seconds
    [Time delta from previous captured frame: 0.000054000 seconds]
    [Time delta from previous displayed frame: 0.000054000 seconds]
    [Time since reference or first frame: 4.839143000 seconds]
    Frame Number: 65
    Frame Length: 2456 bytes (19648 bits)
    Capture Length: 2456 bytes (19648 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:kerberos]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: PcsCompu_d8:25:31 (08:00:27:d8:25:31), Dst:
RealtekU_12:35:02 (52:54:00:12:35:02)
    Destination: RealtekU_12:35:02 (52:54:00:12:35:02)
        Address: RealtekU_12:35:02 (52:54:00:12:35:02)
        .... ..1. .... .... .... .... = LG bit: Locally administered
address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        Address: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 10.0.2.15, Dst: 192.168.50.4
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable
Transport (0)
    Total Length: 2442
    Identification: 0x0488 (1160)
    Flags: 0x02 (Don't Fragment)
        0... .... = Reserved bit: Not set
        .1.. .... = Don't fragment: Set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 128
    Protocol: TCP (6)
    Header checksum: 0x0000 [validation disabled]
    [Header checksum status: Unverified]
    Source: 10.0.2.15
    Destination: 192.168.50.4
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Transmission Control Protocol, Src Port: 50603, Dst Port: 88, Seq: 1,
Ack: 1, Len: 2402
    Source Port: 50603
    Destination Port: 88
    [Stream index: 5]
    [TCP Segment Len: 2402]
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 2403    (relative sequence number)]
    Acknowledgment number: 1    (relative ack number)
    Header Length: 20 bytes
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 64240
    [Calculated window size: 64240]
    [Window size scaling factor: -2 (no window scaling used)]
    Checksum: 0xfec1 [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    [SEQ/ACK analysis]
        [iRTT: 0.000360000 seconds]
        [Bytes in flight: 2402]
        [Bytes sent since last PSH flag: 2402]
    [PDU Size: 2402]
Kerberos
    Record Mark: 2398 bytes
        0... .... .... .... .... .... .... .... = Reserved: Not set
        .000 0000 0000 0000 0000 1001 0101 1110 = Record Length: 2398
    tgs-req
        pvno: 5
        msg-type: krb-tgs-req (12)
        padata: 2 items
            PA-DATA PA-TGS-REQ
                padata-type: kRB5-PADATA-TGS-REQ (1)
                    padata-value:
6e8204603082045ca003020105a10302010ea20703050000...
                        ap-req
                            pvno: 5
                            msg-type: krb-ap-req (14)
                            Padding: 0
                            ap-options: 00000000
                                0... .... = reserved: False
                                .0.. .... = use-session-key: False
                                ..0. .... = mutual-required: False
                            ticket
                                tkt-vno: 5
                                realm: TESTDOMAIN.LAN
                                sname
                                    name-type: kRB5-NT-SRV-INST (2)
                                    sname-string: 2 items
                                        SNameString: krbtgt
                                        SNameString: TESTDOMAIN.LAN
                                enc-part
                                    etype: eTYPE-AES256-CTS-HMAC-SHA1-96 (18)
                                    kvno: 1
                                    cipher:
133e0664961c5a187dc796b60203ab38d8049d5346a6e477...
                            authenticator
                                etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                                cipher:
5b3b67f7ec0fab232a37a0041d6a0df24aa92f8a186c726a...
            PA-DATA Unknown:167
                padata-type: Unknown (167)
                    padata-value: 3009a00703050010000000
        req-body
            Padding: 0
            kdc-options: 40830000 (forwardable, renewable,
request-anonymous, canonicalize)
                0... .... = reserved: False
                .1.. .... = forwardable: True
                ..0. .... = forwarded: False
                ...0 .... = proxiable: False
                .... 0... = proxy: False
                .... .0.. = allow-postdate: False
                .... ..0. = postdated: False
                .... ...0 = unused7: False
                1... .... = renewable: True
                .0.. .... = unused9: False
                ..0. .... = unused10: False
                ...0 .... = opt-hardware-auth: False
                .... ..1. = request-anonymous: True
                .... ...1 = canonicalize: True
                0... .... = constrained-delegation: False
                ..0. .... = disable-transited-check: False
                ...0 .... = renewable-ok: False
                .... 0... = enc-tkt-in-skey: False
                .... ..0. = renew: False
                .... ...0 = validate: False
            realm: TESTDOMAIN.LAN
            sname
                name-type: kRB5-NT-SRV-INST (2)
                sname-string: 2 items
                    SNameString: cifs
                    SNameString: share
            till: 2017-05-24 23:36:29 (UTC)
            nonce: 2038090178
            etype: 3 items
                ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5 (23)
                ENCTYPE: eTYPE-ARCFOUR-HMAC-MD5-56 (24)
                ENCTYPE: eTYPE-ARCFOUR-HMAC-OLD-EXP (-135)
            enc-authorization-data
                etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                cipher: 01353b269f83c12d7f8bce1caeac238b6ef8daf6970ba2b9...
            additional-tickets: 1 item
                Ticket
                    tkt-vno: 5
                    realm: TESTDOMAIN.LAN
                    sname
                        name-type: kRB5-NT-PRINCIPAL (1)
                        sname-string: 1 item
                            SNameString: client$
                    enc-part
                        etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                        kvno: 2
                        cipher:
c0143bc2bc8b66aad128b507dee2ecf0f550179d65db208d...

Response:

Frame 68: 164 bytes on wire (1312 bits), 164 bytes captured (1312
bits) on interface 0
    Interface id: 0 (\Device\NPF_{9B09F445-BC1D-4740-B31B-2DB084D5FEBD})
    Encapsulation type: Ethernet (1)
    Arrival Time: May 24, 2017 23:21:29.253054000 Coordinated Universal Time
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1495668089.253054000 seconds
    [Time delta from previous captured frame: 0.001327000 seconds]
    [Time delta from previous displayed frame: 0.001327000 seconds]
    [Time since reference or first frame: 4.840551000 seconds]
    Frame Number: 68
    Frame Length: 164 bytes (1312 bits)
    Capture Length: 164 bytes (1312 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: eth:ethertype:ip:tcp:kerberos]
    [Coloring Rule Name: TCP]
    [Coloring Rule String: tcp]
Ethernet II, Src: RealtekU_12:35:02 (52:54:00:12:35:02), Dst:
PcsCompu_d8:25:31 (08:00:27:d8:25:31)
    Destination: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        Address: PcsCompu_d8:25:31 (08:00:27:d8:25:31)
        .... ..0. .... .... .... .... = LG bit: Globally unique
address (factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Source: RealtekU_12:35:02 (52:54:00:12:35:02)
        Address: RealtekU_12:35:02 (52:54:00:12:35:02)
        .... ..1. .... .... .... .... = LG bit: Locally administered
address (this is NOT the factory default)
        .... ...0 .... .... .... .... = IG bit: Individual address (unicast)
    Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.50.4, Dst: 10.0.2.15
    0100 .... = Version: 4
    .... 0101 = Header Length: 20 bytes (5)
    Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
        0000 00.. = Differentiated Services Codepoint: Default (0)
        .... ..00 = Explicit Congestion Notification: Not ECN-Capable
Transport (0)
    Total Length: 150
    Identification: 0x48ae (18606)
    Flags: 0x00
        0... .... = Reserved bit: Not set
        .0.. .... = Don't fragment: Not set
        ..0. .... = More fragments: Not set
    Fragment offset: 0
    Time to live: 64
    Protocol: TCP (6)
    Header checksum: 0x32f9 [validation disabled]
    [Header checksum status: Unverified]
    Source: 192.168.50.4
    Destination: 10.0.2.15
    [Source GeoIP: Unknown]
    [Destination GeoIP: Unknown]
Transmission Control Protocol, Src Port: 88, Dst Port: 50603, Seq: 1,
Ack: 2403, Len: 110
    Source Port: 88
    Destination Port: 50603
    [Stream index: 5]
    [TCP Segment Len: 110]
    Sequence number: 1    (relative sequence number)
    [Next sequence number: 111    (relative sequence number)]
    Acknowledgment number: 2403    (relative ack number)
    Header Length: 20 bytes
    Flags: 0x018 (PSH, ACK)
        000. .... .... = Reserved: Not set
        ...0 .... .... = Nonce: Not set
        .... 0... .... = Congestion Window Reduced (CWR): Not set
        .... .0.. .... = ECN-Echo: Not set
        .... ..0. .... = Urgent: Not set
        .... ...1 .... = Acknowledgment: Set
        .... .... 1... = Push: Set
        .... .... .0.. = Reset: Not set
        .... .... ..0. = Syn: Not set
        .... .... ...0 = Fin: Not set
        [TCP Flags: ·······AP···]
    Window size value: 65535
    [Calculated window size: 65535]
    [Window size scaling factor: -2 (no window scaling used)]
    Checksum: 0xc1ad [unverified]
    [Checksum Status: Unverified]
    Urgent pointer: 0
    [SEQ/ACK analysis]
        [iRTT: 0.000360000 seconds]
        [Bytes in flight: 110]
        [Bytes sent since last PSH flag: 110]
    [PDU Size: 110]
Kerberos
    Record Mark: 106 bytes
        0... .... .... .... .... .... .... .... = Reserved: Not set
        .000 0000 0000 0000 0000 0000 0110 1010 = Record Length: 106
    krb-error
        pvno: 5
        msg-type: krb-error (30)
        ctime: 2017-05-24 23:21:29 (UTC)
        cusec: 550
        stime: 2017-05-24 23:21:36 (UTC)
        susec: 951725
        error-code: eRR-BAD-INTEGRITY (31)
        realm: <unspecified realm>
        sname
            name-type: kRB5-NT-UNKNOWN (0)
            sname-string: 0 items


Regards,
Victor Buciuc



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