Parse payload logging function
The security association (SA) between two end points is established by exchanging IKE messages. The Parse Payload function parses the messages in a human-readable format.
Parse payload logging can be enabled by editing the /etc/isakmpd.conf file. The logging entry in the /etc/isakmpd.conf file looks similar to the following:
informationThe type of IKE payloads that Parse Payload logs depends on the content of the IKE message. Examples include SA Payload, Key Exchange Payload, Certificate Request Payload, Certificate Payload, and Signature Payload. The following is an example of a Parse Payload log in which an ISAKMP_MSG_HEADER is followed by five payloads:
ISAKMP_MSG_HEADER
Icookie : 0x9e539a6fd4540990, Rcookie : 0x0000000000000000
Next Payload : 1(SA), Maj Ver : 1, Min Ver : 0
Xchg Type : 4 (Aggressive), Flag= 0, Encr : No,COMMIT : No
Msg ID : 0x00000000
len : 0x10e(270)
SA Payload:
Next Payload : 4(Key Exchange), Payload len : 0x34(52)
DOI : 0x1(INTERNET)
bitmask : 1(SIT_IDENTITY_ONLY
Proposal Payload:
Next Payload : 0(NONE), Payload len : 0x28(40)
Proposal # : 0x1(1), Protocol-ID : 1(ISAKMP)
SPI size : 0x0(0), # of Trans : 0x1(1)
Transform Payload:
Next Payload : 0(NONE), Payload len : 0x20(32)
Trans # : 0x1(1), Trans.ID : 1(KEY_IKE)
Attr : 1(Encr.Alg ), len=0x2(2)
Value=0x1(1),(DES-cbc)
Attr : 2(Hash Alg ), len=0x2(2)
Value=0x1(1),(MD5)
Attr : 3(Auth Method ), len=0x2(2)
Value=0x3(3),(RSA Signature)
Attr : 4(Group Desc ), len=0x2(2)
Value=0x1(1),(default 768-bit MODP group)
Attr : 11(Life Type ), len=0x2(2)
Value=0x1(1),(seconds)
Attr : 12(Life Duration), len=0x2(2)
Value=0x7080(28800)
Key Payload:
Next Payload : 10(Nonce), Payload len : 0x64(100)
Key Data :
33 17 68 10 91 1f ea da 38 a0 22 2d 84 a3 5d 5d
a0 e1 1f 42 c2 10 aa 8d 9d 14 0f 58 3e c4 ec a3
9f 13 62 aa 27 d8 e5 52 8d 5c c3 cf d5 45 1a 79
8a 59 97 1f 3b 1c 08 3e 2a 55 9b 3c 50 cc 82 2c
d9 8b 39 d1 cb 39 c2 a4 05 8d 2d a1 98 74 7d 95
ab d3 5a 39 7d 67 5b a6 2e 37 d3 07 e6 98 1a 6b
Nonce Payload:
Next Payload : 5(ID), Payload len : 0xc(12)
Nonce Data:
6d 21 73 1d dc 60 49 93
ID Payload:
Next Payload : 7(Cert.Req), Payload len : 0x49(73)
ID type : 9(DER_DN), Protocol : 0, Port = 0x0(0)
Certificate Request Payload:
Next Payload : 0(NONE), Payload len : 0x5(5)
Certificate Encoding Type: 4(X.509 Certificate - Signature)Within each payload, a Next Payload field points to the payload following the current payload. If the current payload is the last one in the IKE message, the Next Payload field has the value of zero (None).
Each Payload in the example has information pertaining to the negotiations that are going on. For example, the SA payload has the Proposal and Transform Payloads, which in turn show the encryption algorithm, authentication mode, hash algorithm, SA life type, and SA duration that the initiator is proposing to the responder.
Also, the SA Payload consists of one or more Proposal Payloads and one or more Transform Payloads. The Next Payload field for Proposal Payload has a value of either 0 if it is the only Proposal Payload or a value of 2 if it is followed by one more Proposal Payloads. Similarly, the Next Payload field for a Transform Payload has a value of 0 if it is the only Transform Payload, or a value of 3 if it is followed by one more Transform Payloads, as shown in the following example:
ISAKMP_MSG_HEADER
Icookie : 0xa764fab442b463c6, Rcookie : 0x0000000000000000
Next Payload : 1(SA), Maj Ver : 1, Min Ver : 0
Xchg Type : 2 (ID protected), Flag= 0, Encr : No,COMMIT : No
Msg ID : 0x00000000
len : 0x70(112)
SA Payload:
Next Payload : 0(NONE), Payload len : 0x54(84)
DOI : 0x1(INTERNET)
bitmask : 1(SIT_IDENTITY_ONLY
Proposal Payload:
Next Payload : 0(NONE), Payload len : 0x48(72)
Proposal # : 0x1(1), Protocol-ID : 1(ISAKMP)
SPI size : 0x0(0), # of Trans : 0x2(2)
Transform Payload:
Next Payload : 3(Transform), Payload len : 0x20(32)
Trans # : 0x1(1), Trans.ID : 1(KEY_IKE)
Attr : 1(Encr.Alg ), len=0x2(2)
Value=0x5(5),(3DES-cbc)
Attr : 2(Hash Alg ), len=0x2(2)
Value=0x1(1),(MD5)
Attr : 3(Auth Method ), len=0x2(2)
Value=0x1(1),(Pre-shared Key)
Attr : 4(Group Desc ), len=0x2(2)
Value=0x1(1),(default 768-bit MODP group)
Attr : 11(Life Type ), len=0x2(2)
Value=0x1(1),(seconds)
Attr : 12(Life Duration), len=0x2(2)
Value=0x7080(28800)
Transform Payload:
Next Payload : 0(NONE), Payload len : 0x20(32)
Trans # : 0x2(2), Trans.ID : 1(KEY_IKE)
Attr : 1(Encr.Alg ), len=0x2(2)
Value=0x1(1),(DES-cbc)
Attr : 2(Hash Alg ), len=0x2(2)
Value=0x1(1),(MD5)
Attr : 3(Auth Method ), len=0x2(2)
Value=0x1(1),(Pre-shared Key)
Attr : 4(Group Desc ), len=0x2(2)
Value=0x1(1),(default 768-bit MODP group)
Attr : 11(Life Type ), len=0x2(2)
Value=0x1(1),(seconds)
Attr : 12(Life Duration), len=0x2(2)
Value=0x7080(28800)The IKE message header of a Parse Payload log shows the exchange type (Main Mode or Aggressive Mode), the length of the entire message, the message identifier, and so on.
The Certificate Request Payload requests a certificate from the responder. The responder sends the certificate in a separate message. The following example shows the Certificate Payload and Signature Payload that are sent to a peer as a part of an SA negotiation. The certificate data and the signature data are printed in hex format.
ISAKMP_MSG_HEADER
Icookie : 0x9e539a6fd4540990, Rcookie : 0xc7e0a8d937a8f13e
Next Payload : 6(Certificate), Maj Ver : 1, Min Ver : 0
Xchg Type : 4 (Aggressive), Flag= 0, Encr : No,COMMIT : No
Msg ID : 0x00000000
len : 0x2cd(717)
Certificate Payload:
Next Payload : 9(Signature), Payload len : 0x22d(557)
Certificate Encoding Type: 4(X.509 Certificate - Signature)
Certificate: (len 0x227(551) in bytes
82 02 24 30 82 01 8d a0 03 02 01 02 02 05 05 8e
fb 3e ce 30 0d 06 09 2a 86 48 86 f7 0d 01 01 04
05 00 30 5c 31 0b 30 09 06 03 55 04 06 13 02 46
49 31 24 30 22 06 03 55 04 0a 13 1b 53 53 48 20
43 6f 6d 6d 75 6e 69 63 61 74 69 6f 6e 73 20 53
65 63 75 72 69 74 79 31 11 30 0f 06 03 55 04 0b
13 08 57 65 62 20 74 65 73 74 31 14 30 12 06 03
55 04 03 13 0b 54 65 73 74 20 52 53 41 20 43 41
30 1e 17 0d 39 39 30 39 32 31 30 30 30 30 30 30
5a 17 0d 39 39 31 30 32 31 32 33 35 39 35 39 5a
30 3f 31 0b 30 09 06 03 55 04 06 13 02 55 53 31
10 30 0e 06 03 55 04 0a 13 07 49 42 4d 2f 41 49
58 31 1e 30 1c 06 03 55 04 03 13 15 62 61 72 6e
65 79 2e 61 75 73 74 69 6e 2e 69 62 6d 2e 63 6f
6d 30 81 9f 30 0d 06 09 2a 86 48 86 f7 0d 01 01
01 05 00 03 81 8d 00 30 81 89 02 81 81 00 b2 ef
48 16 86 04 7e ed ba 4c 14 d7 83 cb 18 40 0a 3f
55 e9 ad 8f 0f be c5 b6 6d 19 ec de 9b f5 01 a6
b9 dd 64 52 34 ad 3d cd 0d 8e 82 6a 85 a3 a8 1c
37 e4 00 59 ce aa 62 24 b5 a2 ea 8d 82 a3 0c 6f
b4 07 ad 8a 02 3b 19 92 51 88 fb 2c 44 29 da 72
41 ef 35 72 79 d3 e9 67 02 b2 71 fa 1b 78 13 be
f3 05 6d 10 4a c7 d5 fc fe f4 c0 b8 b8 fb 23 70
a6 4e 16 5f d4 b1 9e 21 18 82 64 6d 17 3b 02 03
01 00 01 a3 0f 30 0d 30 0b 06 03 55 1d 0f 04 04
03 02 07 80 30 0d 06 09 2a 86 48 86 f7 0d 01 01
04 05 00 03 81 81 00 75 a4 ee 9c 3a 18 f2 de 5d
67 d4 1c e4 04 b4 e5 b8 5e 9f 56 e4 ea f0 76 4a
d0 e4 ee 20 42 3f 20 19 d4 25 57 25 70 0a ea 41
81 3b 0b 50 79 b5 fd 1e b6 0f bc 2f 3f 73 7d dd
90 d4 08 17 85 d6 da e7 c5 a4 d6 9a 2e 8a e8 51
7e 59 68 21 55 4c 96 4d 5a 70 7a 50 c1 68 b0 cf
5f 1f 85 d0 12 a4 c2 d3 97 bf a5 42 59 37 be fe
9e 75 23 84 19 14 28 ae c4 c0 63 22 89 47 b1 b6
f4 c7 5d 79 9d ca d0
Signature Payload:
Next Payload : 0(NONE), Payload len : 0x84(132)
Signature: len 0x80(128) in bytes
9d 1b 0d 90 be aa dc 43 95 ba 65 09 b9 00 6d 67
b4 ca a2 85 0f 15 9e 3e 8d 5f e1 f0 43 98 69 d8
5c b6 9c e2 a5 64 f4 ef 0b 31 c3 cb 48 7c d8 30
e3 a2 87 f4 7c 9d 20 49 b2 39 00 fa 8e bf d9 b0
7d b4 8c 4e 19 3a b8 70 90 88 2c cf 89 69 5d 07
f0 5a 81 58 2e 15 40 37 b7 c8 d6 8c 5c e2 50 c3
4d 19 7e e0 e7 c7 c2 93 42 89 46 6b 5f f8 8b 7d
5b cb 07 ea 36 e5 82 9d 70 79 9a fe bd 6c 86 36