Host Identity Protocol (HIP)

The Host Identity Protocol (HIP) is an Identity Exchange mechanism that enables secure communications with tunneling protocols such as ESP. HIP provides a method of separating the end-point identifier and locator roles of IP addresses. It introduces a new Host Identity (HI) name space, based on public keys, from which end-point identifiers are taken. The public keys are typically, but not necessarily, self generated. HIP uses existing IP addressing and forwarding for locators and packet delivery.

Protocol dependencies

• TCP: Typically, HIP uses TCP as its transport protocol.

• UDP: Typically, HIP uses UDP as its transport protocol.

    Note: HIP is not limited to TCP and UDP usage.

Example traffic

No. Time Source Destination Protocol Info

• 1 0.000000 193.167.187.26 193.234.218.203 HIP HIP I1 (HIP Initiator Packet)

... Host Identity Protocol

• Payload Protocol: 59 Header Length: 4 Fixed P-bit: 0 (Always zero) Packet Type: 1 Version: 1, Reserved: 0 Fixed S-bit: 1 (HIP) Checksum: 0x3d4a (correct) HIP Controls: 0x0000
  • ... .... .... ...0 = Anonymous (Sender's HI is anonymous): False
  Sender's HIT: 2001001c009d1d347d57bd541d10a393 Receiver's HIT: 2001001e2c023cbf8e65ee2b05a42820

No. Time Source Destination Protocol Info

• 2 0.037852 193.234.218.203 193.167.187.26 HIP HIP R1 (HIP Responder Packet)

... Host Identity Protocol

• Payload Protocol: 59 Header Length: 74 Fixed P-bit: 0 (Always zero) Packet Type: 2 Version: 1, Reserved: 0 Fixed S-bit: 1 (HIP) Checksum: 0x9fb9 (correct) HIP Controls: 0x0000
  • ... .... .... ...0 = Anonymous (Sender's HI is anonymous): False
  Sender's HIT: 2001001e2c023cbf8e65ee2b05a42820 Receiver's HIT: 2001001c009d1d347d57bd541d10a393 HIP Parameters
  • R1_COUNTER (type=128, length=12)
    • Reserved: 0x00000000 R1 Counter: 0000000000001045
    PUZZLE (type=257, length=12)
    • Difficulty (K): 10 Lifetime: 37 Opaque Data: 0x0000 Random number (I): 23c8b08466518471
    DIFFIE_HELLMAN (type=513, length=195)
    • 3 (1536-bit MODP group) Public Value Length: 192 Public Value: c6d90a4e31a12b297b00162e7ce87d4eac71f53e032a7088...
    HIP_TRANSFORM (type=577, length=4)
    • 1 (AES-CBC with HMAC-SHA1) 2 (3DES-CBC with HMAC-SHA1)
    ESP_TRANSFORM (type=4095, length=6)
    • Reserved: 0x0000 1 (AES-CBC with HMAC-SHA1) 2 (3DES-CBC with HMAC-SHA1)
    HOST_ID (type=705, length=140)
    • Host Identity Length: 136 Domain Identifier Type: 0 Domain Identifier Length: 0 Host Identity flags: 0x0202ff05
      • 0000 0010 0000 0010 .... .... .... .... = Host Identity Header Flags: Key is associated with non-zone entity (0x00000202)
      • ... .... .... .... 1111 1111 .... .... = Host Identity Header Protocol: Key is valid for any protocol (0x000000ff)
      • ... .... .... .... .... .... 0000 0101 = Host Identity Header Algorithm: RSA (0x00000005)
      RSA Host Identity exponent length (e_len): 3 RSA Host Identity exponent (e): 010001 RSA Host Identity public modulus (n): bb7af53ff1a61b2186c468e1680d46084af340ee252cb4ce...
    HIP_SIGNATURE_2 (type=61633, length=129)
    • 5 (RSA) Signature: 5c942e27bfb3002c645902d8106780f96bc71c503f11b00b...
    ECHO_REQUEST_UNSIGNED (type=63661, length=20)
    • Opaque Data: d390247cef89e3a61d8775701b1452bae218f0c6

No. Time Source Destination Protocol Info

• 3 0.052798 193.167.187.26 193.234.218.203 HIP HIP I2 (Second HIP Initiator Packet)

... Host Identity Protocol

• Payload Protocol: 59 Header Length: 84 Fixed P-bit: 0 (Always zero) Packet Type: 3 Version: 1, Reserved: 0 Fixed S-bit: 1 (HIP) Checksum: 0x70ea (correct) HIP Controls: 0x0000
  • ... .... .... ...0 = Anonymous (Sender's HI is anonymous): False
  Sender's HIT: 2001001c009d1d347d57bd541d10a393 Receiver's HIT: 2001001e2c023cbf8e65ee2b05a42820 HIP Parameters
  • ESP_INFO (type=65, length=12)
    • Reserved: 0x0000 Keymaterial Index: 0x0048 Old SPI: 0x00000000 New SPI: 0xc1905228
    R1_COUNTER (type=128, length=12)
    • Reserved: 0x00000048 R1 Counter: 0000000000001045
    SOLUTION (type=321, length=20)
    • Difficulty (K): 10 Reserved: 0 Opaque Data: 0x0000 Random number (I): 23c8b08466518471 Solution (J): 4540f2538515f5d3
    DIFFIE_HELLMAN (type=513, length=195)
    • 3 (1536-bit MODP group) Public Value Length: 192 Public Value: 579c9096ead9be2d39e59173d4d4985a15910ea8702f3b5b...
    HIP_TRANSFORM (type=577, length=2)
    • 1 (AES-CBC with HMAC-SHA1)
    ENCRYPTED (type=641, length=180)
    • Reserved: 0x00000000 Encrypted Parameter Data (176 bytes)
    ESP_TRANSFORM (type=4095, length=4)
    • Reserved: 0x0000 1 (AES-CBC with HMAC-SHA1)
    HMAC (type=61505, length=20)
    • HMAC: 5357199e5c4251ff155a23479dbb1c813c4a7e5c
    HIP_SIGNATURE (type=61697, length=129)
    • 5 (RSA) Signature: 505f0ddc50bc9067147ab6cb00ab99b1c9f87f271712f875...
    ECHO_RESPONSE_UNSIGNED (type=63425, length=20)
    • Opaque Data: d390247cef89e3a61d8775701b1452bae218f0c6

No. Time Source Destination Protocol Info

• 4 0.198993 193.234.218.203 193.167.187.26 HIP HIP R2 (Second HIP Responder Packet)

... Host Identity Protocol

• Payload Protocol: 59 Header Length: 26 Fixed P-bit: 0 (Always zero) Packet Type: 4 Version: 1, Reserved: 0 Fixed S-bit: 1 (HIP) Checksum: 0x5728 (correct) HIP Controls: 0x0000
  • ... .... .... ...0 = Anonymous (Sender's HI is anonymous): False
  Sender's HIT: 2001001e2c023cbf8e65ee2b05a42820 Receiver's HIT: 2001001c009d1d347d57bd541d10a393 HIP Parameters
  • ESP_INFO (type=65, length=12)
    • Reserved: 0x0000 Keymaterial Index: 0x0048 Old SPI: 0x00000000 New SPI: 0x3b71d381
    HMAC_2 (type=61569, length=20)
    • HMAC: abe35f9e9fc6e1ca12526eb4ed195a44f9e29dd1
    HIP_SIGNATURE (type=61697, length=129)
    • 5 (RSA) Signature: 818c6d10afe29450f90159289948f55d3175ab94b514d947...

Wireshark

The HIP dissector is fully functional and conforms to the following specifications:

RFC 5201, RFC 5202, RFC 5203, RFC 5204. RFC 5206, draft-ietf-hip-nat-traversal-09 (RFC 5770), draft-ietf-hip-cert-03

Display Filter

A complete list of HIP display filter fields can be found in the display filter reference

• Show only the HIP based traffic:

   hip 

External links

• RFC 4423 Host Identity Protocol (HIP) Architecture.

• RFC 5201 Host Identity Protocol.

• RFC 5202 Using the Encapsulating Security Payload (ESP) Transport Format with the Host Identity Protocol (HIP).

• RFC 5203 Host Identity Protocol (HIP) Registration Extension.

• RFC 5204 Host Identity Protocol (HIP) Rendezvous Extension.

• RFC 5206 End-Host Mobility and Multihoming with the Host Identity Protocol.

• RFC 5770 Basic Host Identity Protocol (HIP) Extensions for Traversal of Network Address Translators.

• Draft HIP CERT HIP Certificates.