+#include "ipproto.h"
+
+/* refer to RFC 2408 */
+
+typedef u_char cookie_t[8];
+typedef u_char msgid_t[4];
+
+#define PORT_ISAKMP 500
+
+/* 3.1 ISAKMP Header Format (IKEv1 and IKEv2)
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Initiator !
+ ! Cookie !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Responder !
+ ! Cookie !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Next Payload ! MjVer ! MnVer ! Exchange Type ! Flags !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Message ID !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+struct isakmp {
+ cookie_t i_ck; /* Initiator Cookie */
+ cookie_t r_ck; /* Responder Cookie */
+ uint8_t np; /* Next Payload Type */
+ uint8_t vers;
+#define ISAKMP_VERS_MAJOR 0xf0
+#define ISAKMP_VERS_MAJOR_SHIFT 4
+#define ISAKMP_VERS_MINOR 0x0f
+#define ISAKMP_VERS_MINOR_SHIFT 0
+ uint8_t etype; /* Exchange Type */
+ uint8_t flags; /* Flags */
+ msgid_t msgid;
+ uint32_t len; /* Length */
+};
+
+/* Next Payload Type */
+#define ISAKMP_NPTYPE_NONE 0 /* NONE*/
+#define ISAKMP_NPTYPE_SA 1 /* Security Association */
+#define ISAKMP_NPTYPE_P 2 /* Proposal */
+#define ISAKMP_NPTYPE_T 3 /* Transform */
+#define ISAKMP_NPTYPE_KE 4 /* Key Exchange */
+#define ISAKMP_NPTYPE_ID 5 /* Identification */
+#define ISAKMP_NPTYPE_CERT 6 /* Certificate */
+#define ISAKMP_NPTYPE_CR 7 /* Certificate Request */
+#define ISAKMP_NPTYPE_HASH 8 /* Hash */
+#define ISAKMP_NPTYPE_SIG 9 /* Signature */
+#define ISAKMP_NPTYPE_NONCE 10 /* Nonce */
+#define ISAKMP_NPTYPE_N 11 /* Notification */
+#define ISAKMP_NPTYPE_D 12 /* Delete */
+#define ISAKMP_NPTYPE_VID 13 /* Vendor ID */
+#define ISAKMP_NPTYPE_v2E 46 /* v2 Encrypted payload */
+
+#define IKEv1_MAJOR_VERSION 1
+#define IKEv1_MINOR_VERSION 0
+
+#define IKEv2_MAJOR_VERSION 2
+#define IKEv2_MINOR_VERSION 0
+
+/* Flags */
+#define ISAKMP_FLAG_E 0x01 /* Encryption Bit */
+#define ISAKMP_FLAG_C 0x02 /* Commit Bit */
+#define ISAKMP_FLAG_extra 0x04
+
+/* IKEv2 */
+#define ISAKMP_FLAG_I (1 << 3) /* (I)nitiator */
+#define ISAKMP_FLAG_V (1 << 4) /* (V)ersion */
+#define ISAKMP_FLAG_R (1 << 5) /* (R)esponse */
+
+
+/* 3.2 Payload Generic Header
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ! Next Payload ! RESERVED ! Payload Length !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+struct isakmp_gen {
+ uint8_t np; /* Next Payload */
+ uint8_t critical; /* bit 7 - critical, rest is RESERVED */
+ uint16_t len; /* Payload Length */
+};
+
+/* 3.3 Data Attributes
+ 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ !A! Attribute Type ! AF=0 Attribute Length !
+ !F! ! AF=1 Attribute Value !
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ . AF=0 Attribute Value .
+ . AF=1 Not Transmitted .
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+struct isakmp_data {
+ uint16_t type; /* defined by DOI-spec, and Attribute Format */
+ uint16_t lorv; /* if f equal 1, Attribute Length */
+ /* if f equal 0, Attribute Value */
+ /* if f equal 1, Attribute Value */
+};
+
+/* 3.4 Security Association Payload */
+ /* MAY NOT be used, because of being defined in ipsec-doi. */
+ /*
+ If the current payload is the last in the message,
+ then the value of the next payload field will be 0.
+ This field MUST NOT contain the
+ values for the Proposal or Transform payloads as they are considered
+ part of the security association negotiation. For example, this
+ field would contain the value "10" (Nonce payload) in the first
+ message of a Base Exchange (see Section 4.4) and the value "0" in the
+ first message of an Identity Protect Exchange (see Section 4.5).
+ */
+struct ikev1_pl_sa {
+ struct isakmp_gen h;
+ uint32_t doi; /* Domain of Interpretation */
+ uint32_t sit; /* Situation */
+};
+
+/* 3.5 Proposal Payload */
+ /*
+ The value of the next payload field MUST only contain the value "2"
+ or "0". If there are additional Proposal payloads in the message,
+ then this field will be 2. If the current Proposal payload is the
+ last within the security association proposal, then this field will
+ be 0.
+ */
+struct ikev1_pl_p {
+ struct isakmp_gen h;
+ uint8_t p_no; /* Proposal # */
+ uint8_t prot_id; /* Protocol */
+ uint8_t spi_size; /* SPI Size */
+ uint8_t num_t; /* Number of Transforms */
+ /* SPI */
+};
+
+/* 3.6 Transform Payload */
+ /*
+ The value of the next payload field MUST only contain the value "3"
+ or "0". If there are additional Transform payloads in the proposal,
+ then this field will be 3. If the current Transform payload is the
+ last within the proposal, then this field will be 0.
+ */
+struct ikev1_pl_t {
+ struct isakmp_gen h;
+ uint8_t t_no; /* Transform # */
+ uint8_t t_id; /* Transform-Id */
+ uint16_t reserved; /* RESERVED2 */
+ /* SA Attributes */
+};
+
+/* 3.7 Key Exchange Payload */
+struct ikev1_pl_ke {
+ struct isakmp_gen h;
+ /* Key Exchange Data */
+};
+
+/* 3.8 Identification Payload */
+ /* MUST NOT to be used, because of being defined in ipsec-doi. */
+struct ikev1_pl_id {
+ struct isakmp_gen h;
+ union {
+ uint8_t id_type; /* ID Type */
+ uint32_t doi_data; /* DOI Specific ID Data */
+ } d;
+ /* Identification Data */
+};
+
+/* 3.9 Certificate Payload */
+struct ikev1_pl_cert {
+ struct isakmp_gen h;
+ uint8_t encode; /* Cert Encoding */
+ char cert; /* Certificate Data */
+ /*
+ This field indicates the type of
+ certificate or certificate-related information contained in the
+ Certificate Data field.
+ */
+};
+
+/* 3.10 Certificate Request Payload */
+struct ikev1_pl_cr {
+ struct isakmp_gen h;
+ uint8_t num_cert; /* # Cert. Types */
+ /*
+ Certificate Types (variable length)
+ -- Contains a list of the types of certificates requested,
+ sorted in order of preference. Each individual certificate
+ type is 1 octet. This field is NOT requiredo
+ */
+ /* # Certificate Authorities (1 octet) */
+ /* Certificate Authorities (variable length) */
+};
+
+/* 3.11 Hash Payload */
+ /* may not be used, because of having only data. */
+struct ikev1_pl_hash {
+ struct isakmp_gen h;
+ /* Hash Data */
+};
+
+/* 3.12 Signature Payload */
+ /* may not be used, because of having only data. */
+struct ikev1_pl_sig {
+ struct isakmp_gen h;
+ /* Signature Data */
+};
+
+/* 3.13 Nonce Payload */
+ /* may not be used, because of having only data. */
+struct ikev1_pl_nonce {
+ struct isakmp_gen h;
+ /* Nonce Data */
+};
+
+/* 3.14 Notification Payload */
+struct ikev1_pl_n {
+ struct isakmp_gen h;
+ uint32_t doi; /* Domain of Interpretation */
+ uint8_t prot_id; /* Protocol-ID */
+ uint8_t spi_size; /* SPI Size */
+ uint16_t type; /* Notify Message Type */
+ /* SPI */
+ /* Notification Data */
+};
+
+/* 3.14.1 Notify Message Types */
+/* NOTIFY MESSAGES - ERROR TYPES */
+#define ISAKMP_NTYPE_INVALID_PAYLOAD_TYPE 1
+#define ISAKMP_NTYPE_DOI_NOT_SUPPORTED 2
+#define ISAKMP_NTYPE_SITUATION_NOT_SUPPORTED 3
+#define ISAKMP_NTYPE_INVALID_COOKIE 4
+#define ISAKMP_NTYPE_INVALID_MAJOR_VERSION 5
+#define ISAKMP_NTYPE_INVALID_MINOR_VERSION 6
+#define ISAKMP_NTYPE_INVALID_EXCHANGE_TYPE 7
+#define ISAKMP_NTYPE_INVALID_FLAGS 8
+#define ISAKMP_NTYPE_INVALID_MESSAGE_ID 9
+#define ISAKMP_NTYPE_INVALID_PROTOCOL_ID 10
+#define ISAKMP_NTYPE_INVALID_SPI 11
+#define ISAKMP_NTYPE_INVALID_TRANSFORM_ID 12
+#define ISAKMP_NTYPE_ATTRIBUTES_NOT_SUPPORTED 13
+#define ISAKMP_NTYPE_NO_PROPOSAL_CHOSEN 14
+#define ISAKMP_NTYPE_BAD_PROPOSAL_SYNTAX 15
+#define ISAKMP_NTYPE_PAYLOAD_MALFORMED 16
+#define ISAKMP_NTYPE_INVALID_KEY_INFORMATION 17
+#define ISAKMP_NTYPE_INVALID_ID_INFORMATION 18
+#define ISAKMP_NTYPE_INVALID_CERT_ENCODING 19
+#define ISAKMP_NTYPE_INVALID_CERTIFICATE 20
+#define ISAKMP_NTYPE_BAD_CERT_REQUEST_SYNTAX 21
+#define ISAKMP_NTYPE_INVALID_CERT_AUTHORITY 22
+#define ISAKMP_NTYPE_INVALID_HASH_INFORMATION 23
+#define ISAKMP_NTYPE_AUTHENTICATION_FAILED 24
+#define ISAKMP_NTYPE_INVALID_SIGNATURE 25
+#define ISAKMP_NTYPE_ADDRESS_NOTIFICATION 26
+
+/* 3.15 Delete Payload */
+struct ikev1_pl_d {
+ struct isakmp_gen h;
+ uint32_t doi; /* Domain of Interpretation */
+ uint8_t prot_id; /* Protocol-Id */
+ uint8_t spi_size; /* SPI Size */
+ uint16_t num_spi; /* # of SPIs */
+ /* SPI(es) */
+};
projects / tcpdump / blobdiff