1 /* 2 * IKEv2 definitions 3 * Copyright (c) 2007, Jouni Malinen <j (at) w1.fi> 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 9 #ifndef IKEV2_COMMON_H 10 #define IKEV2_COMMON_H 11 12 /* 13 * Nonce length must be at least 16 octets. It must also be at least half the 14 * key size of the negotiated PRF. 15 */ 16 #define IKEV2_NONCE_MIN_LEN 16 17 #define IKEV2_NONCE_MAX_LEN 256 18 19 /* IKE Header - RFC 4306, Sect. 3.1 */ 20 #ifdef _MSC_VER 21 #pragma pack(push, 1) 22 #endif /* _MSC_VER */ 23 24 #define IKEV2_SPI_LEN 8 25 26 struct ikev2_hdr { 27 u8 i_spi[IKEV2_SPI_LEN]; /* IKE_SA Initiator's SPI */ 28 u8 r_spi[IKEV2_SPI_LEN]; /* IKE_SA Responder's SPI */ 29 u8 next_payload; 30 u8 version; /* MjVer | MnVer */ 31 u8 exchange_type; 32 u8 flags; 33 u8 message_id[4]; 34 u8 length[4]; /* total length of HDR + payloads */ 35 } STRUCT_PACKED; 36 37 struct ikev2_payload_hdr { 38 u8 next_payload; 39 u8 flags; 40 u8 payload_length[2]; /* this payload, including the payload header */ 41 } STRUCT_PACKED; 42 43 struct ikev2_proposal { 44 u8 type; /* 0 (last) or 2 (more) */ 45 u8 reserved; 46 u8 proposal_length[2]; /* including all transform and attributes */ 47 u8 proposal_num; 48 u8 protocol_id; /* IKEV2_PROTOCOL_* */ 49 u8 spi_size; 50 u8 num_transforms; 51 /* SPI of spi_size octets */ 52 /* Transforms */ 53 } STRUCT_PACKED; 54 55 struct ikev2_transform { 56 u8 type; /* 0 (last) or 3 (more) */ 57 u8 reserved; 58 u8 transform_length[2]; /* including Header and Attributes */ 59 u8 transform_type; 60 u8 reserved2; 61 u8 transform_id[2]; 62 /* Transform Attributes */ 63 } STRUCT_PACKED; 64 65 #ifdef _MSC_VER 66 #pragma pack(pop) 67 #endif /* _MSC_VER */ 68 69 70 /* Current IKEv2 version from RFC 4306 */ 71 #define IKEV2_MjVer 2 72 #define IKEV2_MnVer 0 73 #define IKEV2_VERSION (((IKEV2_MjVer) << 4) | (IKEV2_MnVer)) 74 75 /* IKEv2 Exchange Types */ 76 enum { 77 /* 0-33 RESERVED */ 78 IKE_SA_INIT = 34, 79 IKE_SA_AUTH = 35, 80 CREATE_CHILD_SA = 36, 81 INFORMATION = 37 82 /* 38-239 RESERVED TO IANA */ 83 /* 240-255 Reserved for private use */ 84 }; 85 86 /* IKEv2 Flags */ 87 #define IKEV2_HDR_INITIATOR 0x08 88 #define IKEV2_HDR_VERSION 0x10 89 #define IKEV2_HDR_RESPONSE 0x20 90 91 /* Payload Header Flags */ 92 #define IKEV2_PAYLOAD_FLAGS_CRITICAL 0x01 93 94 95 /* EAP-IKEv2 Payload Types (in Next Payload Type field) 96 * http://www.iana.org/assignments/eap-ikev2-payloads */ 97 enum { 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 = 121 111 }; 112 113 114 /* IKEv2 Proposal - Protocol ID */ 115 enum { 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 = 3 120 }; 121 122 123 /* IKEv2 Transform Types */ 124 enum { 125 IKEV2_TRANSFORM_ENCR = 1, 126 IKEV2_TRANSFORM_PRF = 2, 127 IKEV2_TRANSFORM_INTEG = 3, 128 IKEV2_TRANSFORM_DH = 4, 129 IKEV2_TRANSFORM_ESN = 5 130 }; 131 132 /* IKEv2 Transform Type 1 (Encryption Algorithm) */ 133 enum { 134 ENCR_DES_IV64 = 1, 135 ENCR_DES = 2, 136 ENCR_3DES = 3, 137 ENCR_RC5 = 4, 138 ENCR_IDEA = 5, 139 ENCR_CAST = 6, 140 ENCR_BLOWFISH = 7, 141 ENCR_3IDEA = 8, 142 ENCR_DES_IV32 = 9, 143 ENCR_NULL = 11, 144 ENCR_AES_CBC = 12, 145 ENCR_AES_CTR = 13 146 }; 147 148 /* IKEv2 Transform Type 2 (Pseudo-random Function) */ 149 enum { 150 PRF_HMAC_MD5 = 1, 151 PRF_HMAC_SHA1 = 2, 152 PRF_HMAC_TIGER = 3, 153 PRF_AES128_XCBC = 4 154 }; 155 156 /* IKEv2 Transform Type 3 (Integrity Algorithm) */ 157 enum { 158 AUTH_HMAC_MD5_96 = 1, 159 AUTH_HMAC_SHA1_96 = 2, 160 AUTH_DES_MAC = 3, 161 AUTH_KPDK_MD5 = 4, 162 AUTH_AES_XCBC_96 = 5 163 }; 164 165 /* IKEv2 Transform Type 4 (Diffie-Hellman Group) */ 166 enum { 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 */ 175 }; 176 177 178 /* Identification Data Types (RFC 4306, Sect. 3.5) */ 179 enum { 180 ID_IPV4_ADDR = 1, 181 ID_FQDN = 2, 182 ID_RFC822_ADDR = 3, 183 ID_IPV6_ADDR = 5, 184 ID_DER_ASN1_DN = 9, 185 ID_DER_ASN1_GN= 10, 186 ID_KEY_ID = 11 187 }; 188 189 190 /* Certificate Encoding (RFC 4306, Sect. 3.6) */ 191 enum { 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 = 13 208 }; 209 210 211 /* Authentication Method (RFC 4306, Sect. 3.8) */ 212 enum { 213 AUTH_RSA_SIGN = 1, 214 AUTH_SHARED_KEY_MIC = 2, 215 AUTH_DSS_SIGN = 3 216 }; 217 218 219 /* Notify Message Types (RFC 4306, Sect. 3.10.1) */ 220 enum { 221 UNSUPPORTED_CRITICAL_PAYLOAD = 1, 222 INVALID_IKE_SPI = 4, 223 INVALID_MAJOR_VERSION = 5, 224 INVALID_SYNTAX = 7, 225 INVALID_MESSAGE_ID = 9, 226 INVALID_SPI = 11, 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 = 39 236 }; 237 238 239 struct ikev2_keys { 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; 242 }; 243 244 245 int ikev2_keys_set(struct ikev2_keys *keys); 246 void ikev2_free_keys(struct ikev2_keys *keys); 247 248 249 /* Maximum hash length for supported hash algorithms */ 250 #define IKEV2_MAX_HASH_LEN 20 251 252 struct ikev2_integ_alg { 253 int id; 254 size_t key_len; 255 size_t hash_len; 256 }; 257 258 struct ikev2_prf_alg { 259 int id; 260 size_t key_len; 261 size_t hash_len; 262 }; 263 264 struct ikev2_encr_alg { 265 int id; 266 size_t key_len; 267 size_t block_size; 268 }; 269 270 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, 276 u8 *hash); 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); 285 286 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, 292 u8 *auth_data); 293 294 295 struct ikev2_payloads { 296 const u8 *sa; 297 size_t sa_len; 298 const u8 *ke; 299 size_t ke_len; 300 const u8 *idi; 301 size_t idi_len; 302 const u8 *idr; 303 size_t idr_len; 304 const u8 *cert; 305 size_t cert_len; 306 const u8 *auth; 307 size_t auth_len; 308 const u8 *nonce; 309 size_t nonce_len; 310 const u8 *encrypted; 311 size_t encrypted_len; 312 u8 encr_next_payload; 313 const u8 *notification; 314 size_t notification_len; 315 }; 316 317 int ikev2_parse_payloads(struct ikev2_payloads *payloads, 318 u8 next_payload, const u8 *pos, const u8 *end); 319 320 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, 323 size_t *res_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); 333 334 #endif /* IKEV2_COMMON_H */ 335
