3 * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
10 #define IKEV2_COMMON_H
13 * Nonce length must be at least 16 octets. It must also be at least half the
14 * key size of the negotiated PRF.
16 #define IKEV2_NONCE_MIN_LEN 16
17 #define IKEV2_NONCE_MAX_LEN 256
19 /* IKE Header - RFC 4306, Sect. 3.1 */
24 #define IKEV2_SPI_LEN 8
27 u8 i_spi[IKEV2_SPI_LEN]; /* IKE_SA Initiator's SPI */
28 u8 r_spi[IKEV2_SPI_LEN]; /* IKE_SA Responder's SPI */
30 u8 version; /* MjVer | MnVer */
34 u8 length[4]; /* total length of HDR + payloads */
37 struct ikev2_payload_hdr {
40 u8 payload_length[2]; /* this payload, including the payload header */
43 struct ikev2_proposal {
44 u8 type; /* 0 (last) or 2 (more) */
46 u8 proposal_length[2]; /* including all transform and attributes */
48 u8 protocol_id; /* IKEV2_PROTOCOL_* */
51 /* SPI of spi_size octets */
55 struct ikev2_transform {
56 u8 type; /* 0 (last) or 3 (more) */
58 u8 transform_length[2]; /* including Header and Attributes */
62 /* Transform Attributes */
70 /* Current IKEv2 version from RFC 4306 */
73 #define IKEV2_VERSION (((IKEV2_MjVer) << 4) | (IKEV2_MnVer))
75 /* IKEv2 Exchange Types */
82 /* 38-239 RESERVED TO IANA */
83 /* 240-255 Reserved for private use */
87 #define IKEV2_HDR_INITIATOR 0x08
88 #define IKEV2_HDR_VERSION 0x10
89 #define IKEV2_HDR_RESPONSE 0x20
91 /* Payload Header Flags */
92 #define IKEV2_PAYLOAD_FLAGS_CRITICAL 0x01
95 /* EAP-IKEv2 Payload Types (in Next Payload Type field)
96 * http://www.iana.org/assignments/eap-ikev2-payloads */
98 IKEV2_PAYLOAD_NO_NEXT_PAYLOAD = 0,
99 IKEV2_PAYLOAD_SA = 33,
100 IKEV2_PAYLOAD_KEY_EXCHANGE = 34,
101 IKEV2_PAYLOAD_IDi = 35,
102 IKEV2_PAYLOAD_IDr = 36,
103 IKEV2_PAYLOAD_CERTIFICATE = 37,
104 IKEV2_PAYLOAD_CERT_REQ = 38,
105 IKEV2_PAYLOAD_AUTHENTICATION = 39,
106 IKEV2_PAYLOAD_NONCE = 40,
107 IKEV2_PAYLOAD_NOTIFICATION = 41,
108 IKEV2_PAYLOAD_VENDOD_ID = 43,
109 IKEV2_PAYLOAD_ENCRYPTED = 46,
110 IKEV2_PAYLOAD_NEXT_FAST_ID = 121
114 /* IKEv2 Proposal - Protocol ID */
116 IKEV2_PROTOCOL_RESERVED = 0,
117 IKEV2_PROTOCOL_IKE = 1, /* IKE is the only one allowed for EAP-IKEv2 */
118 IKEV2_PROTOCOL_AH = 2,
119 IKEV2_PROTOCOL_ESP = 3
123 /* IKEv2 Transform Types */
125 IKEV2_TRANSFORM_ENCR = 1,
126 IKEV2_TRANSFORM_PRF = 2,
127 IKEV2_TRANSFORM_INTEG = 3,
128 IKEV2_TRANSFORM_DH = 4,
129 IKEV2_TRANSFORM_ESN = 5
132 /* IKEv2 Transform Type 1 (Encryption Algorithm) */
148 /* IKEv2 Transform Type 2 (Pseudo-random Function) */
156 /* IKEv2 Transform Type 3 (Integrity Algorithm) */
158 AUTH_HMAC_MD5_96 = 1,
159 AUTH_HMAC_SHA1_96 = 2,
165 /* IKEv2 Transform Type 4 (Diffie-Hellman Group) */
167 DH_GROUP1_768BIT_MODP = 1, /* RFC 4306 */
168 DH_GROUP2_1024BIT_MODP = 2, /* RFC 4306 */
169 DH_GROUP5_1536BIT_MODP = 5, /* RFC 3526 */
170 DH_GROUP5_2048BIT_MODP = 14, /* RFC 3526 */
171 DH_GROUP5_3072BIT_MODP = 15, /* RFC 3526 */
172 DH_GROUP5_4096BIT_MODP = 16, /* RFC 3526 */
173 DH_GROUP5_6144BIT_MODP = 17, /* RFC 3526 */
174 DH_GROUP5_8192BIT_MODP = 18 /* RFC 3526 */
178 /* Identification Data Types (RFC 4306, Sect. 3.5) */
190 /* Certificate Encoding (RFC 4306, Sect. 3.6) */
192 CERT_ENCODING_PKCS7_X509 = 1,
193 CERT_ENCODING_PGP_CERT = 2,
194 CERT_ENCODING_DNS_SIGNED_KEY = 3,
195 /* X.509 Certificate - Signature: DER encoded X.509 certificate whose
196 * public key is used to validate the sender's AUTH payload */
197 CERT_ENCODING_X509_CERT_SIGN = 4,
198 CERT_ENCODING_KERBEROS_TOKEN = 6,
199 /* DER encoded X.509 certificate revocation list */
200 CERT_ENCODING_CRL = 7,
201 CERT_ENCODING_ARL = 8,
202 CERT_ENCODING_SPKI_CERT = 9,
203 CERT_ENCODING_X509_CERT_ATTR = 10,
204 /* PKCS #1 encoded RSA key */
205 CERT_ENCODING_RAW_RSA_KEY = 11,
206 CERT_ENCODING_HASH_AND_URL_X509_CERT = 12,
207 CERT_ENCODING_HASH_AND_URL_X509_BUNDLE = 13
211 /* Authentication Method (RFC 4306, Sect. 3.8) */
214 AUTH_SHARED_KEY_MIC = 2,
219 /* Notify Message Types (RFC 4306, Sect. 3.10.1) */
221 UNSUPPORTED_CRITICAL_PAYLOAD = 1,
223 INVALID_MAJOR_VERSION = 5,
225 INVALID_MESSAGE_ID = 9,
227 NO_PROPOSAL_CHOSEN = 14,
228 INVALID_KE_PAYLOAD = 17,
229 AUTHENTICATION_FAILED = 24,
230 SINGLE_PAIR_REQUIRED = 34,
231 NO_ADDITIONAL_SAS = 35,
232 INTERNAL_ADDRESS_FAILURE = 36,
233 FAILED_CP_REQUIRED = 37,
234 TS_UNACCEPTABLE = 38,
235 INVALID_SELECTORS = 39
240 u8 *SK_d, *SK_ai, *SK_ar, *SK_ei, *SK_er, *SK_pi, *SK_pr;
241 size_t SK_d_len, SK_integ_len, SK_encr_len, SK_prf_len;
245 int ikev2_keys_set(struct ikev2_keys *keys);
246 void ikev2_free_keys(struct ikev2_keys *keys);
249 /* Maximum hash length for supported hash algorithms */
250 #define IKEV2_MAX_HASH_LEN 20
252 struct ikev2_integ_alg {
258 struct ikev2_prf_alg {
264 struct ikev2_encr_alg {
270 const struct ikev2_integ_alg * ikev2_get_integ(int id);
271 int ikev2_integ_hash(int alg, const u8 *key, size_t key_len, const u8 *data,
272 size_t data_len, u8 *hash);
273 const struct ikev2_prf_alg * ikev2_get_prf(int id);
274 int ikev2_prf_hash(int alg, const u8 *key, size_t key_len,
275 size_t num_elem, const u8 *addr[], const size_t *len,
277 int ikev2_prf_plus(int alg, const u8 *key, size_t key_len,
278 const u8 *data, size_t data_len,
279 u8 *out, size_t out_len);
280 const struct ikev2_encr_alg * ikev2_get_encr(int id);
281 int ikev2_encr_encrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
282 const u8 *plain, u8 *crypt, size_t len);
283 int ikev2_encr_decrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
284 const u8 *crypt, u8 *plain, size_t len);
286 int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
287 const u8 *ID, size_t ID_len, u8 ID_type,
288 struct ikev2_keys *keys, int initiator,
289 const u8 *shared_secret, size_t shared_secret_len,
290 const u8 *nonce, size_t nonce_len,
291 const u8 *key_pad, size_t key_pad_len,
295 struct ikev2_payloads {
311 size_t encrypted_len;
312 u8 encr_next_payload;
313 const u8 *notification;
314 size_t notification_len;
317 int ikev2_parse_payloads(struct ikev2_payloads *payloads,
318 u8 next_payload, const u8 *pos, const u8 *end);
320 u8 * ikev2_decrypt_payload(int encr_id, int integ_id, struct ikev2_keys *keys,
321 int initiator, const struct ikev2_hdr *hdr,
322 const u8 *encrypted, size_t encrypted_len,
324 void ikev2_update_hdr(struct wpabuf *msg);
325 int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
326 int initiator, struct wpabuf *msg,
327 struct wpabuf *plain, u8 next_payload);
328 int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
329 const struct ikev2_integ_alg *integ,
330 const struct ikev2_encr_alg *encr,
331 const u8 *skeyseed, const u8 *data, size_t data_len,
332 struct ikev2_keys *keys);
334 #endif /* IKEV2_COMMON_H */