contrib/hostapd/src/eap_common/ikev2_common.h

   1 /*
   2  * IKEv2 definitions
   3  * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #ifndef IKEV2_COMMON_H
  16 #define IKEV2_COMMON_H
  17
  18 /*
  19  * Nonce length must be at least 16 octets. It must also be at least half the
  20  * key size of the negotiated PRF.
  21  */
  22 #define IKEV2_NONCE_MIN_LEN 16
  23 #define IKEV2_NONCE_MAX_LEN 256
  24
  25 /* IKE Header - RFC 4306, Sect. 3.1 */
  26 #ifdef _MSC_VER
  27 #pragma pack(push, 1)
  28 #endif /* _MSC_VER */
  29
  30 #define IKEV2_SPI_LEN 8
  31
  32 struct ikev2_hdr {
  33         u8 i_spi[IKEV2_SPI_LEN]; /* IKE_SA Initiator's SPI */
  34         u8 r_spi[IKEV2_SPI_LEN]; /* IKE_SA Responder's SPI */
  35         u8 next_payload;
  36         u8 version; /* MjVer | MnVer */
  37         u8 exchange_type;
  38         u8 flags;
  39         u8 message_id[4];
  40         u8 length[4]; /* total length of HDR + payloads */
  41 } STRUCT_PACKED;
  42
  43 struct ikev2_payload_hdr {
  44         u8 next_payload;
  45         u8 flags;
  46         u8 payload_length[2]; /* this payload, including the payload header */
  47 } STRUCT_PACKED;
  48
  49 struct ikev2_proposal {
  50         u8 type; /* 0 (last) or 2 (more) */
  51         u8 reserved;
  52         u8 proposal_length[2]; /* including all transform and attributes */
  53         u8 proposal_num;
  54         u8 protocol_id; /* IKEV2_PROTOCOL_* */
  55         u8 spi_size;
  56         u8 num_transforms;
  57         /* SPI of spi_size octets */
  58         /* Transforms */
  59 } STRUCT_PACKED;
  60
  61 struct ikev2_transform {
  62         u8 type; /* 0 (last) or 3 (more) */
  63         u8 reserved;
  64         u8 transform_length[2]; /* including Header and Attributes */
  65         u8 transform_type;
  66         u8 reserved2;
  67         u8 transform_id[2];
  68         /* Transform Attributes */
  69 } STRUCT_PACKED;
  70
  71 #ifdef _MSC_VER
  72 #pragma pack(pop)
  73 #endif /* _MSC_VER */
  74
  75
  76 /* Current IKEv2 version from RFC 4306 */
  77 #define IKEV2_MjVer 2
  78 #define IKEV2_MnVer 0
  79 #ifdef CCNS_PL
  80 #define IKEV2_VERSION ((IKEV2_MjVer) | ((IKEV2_MnVer) << 4))
  81 #else /* CCNS_PL */
  82 #define IKEV2_VERSION (((IKEV2_MjVer) << 4) | (IKEV2_MnVer))
  83 #endif /* CCNS_PL */
  84
  85 /* IKEv2 Exchange Types */
  86 enum {
  87         /* 0-33 RESERVED */
  88         IKE_SA_INIT = 34,
  89         IKE_SA_AUTH = 35,
  90         CREATE_CHILD_SA = 36,
  91         INFORMATION = 37
  92         /* 38-239 RESERVED TO IANA */
  93         /* 240-255 Reserved for private use */
  94 };
  95
  96 /* IKEv2 Flags */
  97 #define IKEV2_HDR_INITIATOR     0x08
  98 #define IKEV2_HDR_VERSION       0x10
  99 #define IKEV2_HDR_RESPONSE      0x20
 100
 101 /* Payload Header Flags */
 102 #define IKEV2_PAYLOAD_FLAGS_CRITICAL 0x01
 103
 104
 105 /* EAP-IKEv2 Payload Types (in Next Payload Type field)
 106  * http://www.iana.org/assignments/eap-ikev2-payloads */
 107 enum {
 108         IKEV2_PAYLOAD_NO_NEXT_PAYLOAD = 0,
 109         IKEV2_PAYLOAD_SA = 33,
 110         IKEV2_PAYLOAD_KEY_EXCHANGE = 34,
 111         IKEV2_PAYLOAD_IDi = 35,
 112         IKEV2_PAYLOAD_IDr = 36,
 113         IKEV2_PAYLOAD_CERTIFICATE = 37,
 114         IKEV2_PAYLOAD_CERT_REQ = 38,
 115         IKEV2_PAYLOAD_AUTHENTICATION = 39,
 116         IKEV2_PAYLOAD_NONCE = 40,
 117         IKEV2_PAYLOAD_NOTIFICATION = 41,
 118         IKEV2_PAYLOAD_VENDOD_ID = 43,
 119         IKEV2_PAYLOAD_ENCRYPTED = 46,
 120         IKEV2_PAYLOAD_NEXT_FAST_ID = 121
 121 };
 122
 123
 124 /* IKEv2 Proposal - Protocol ID */
 125 enum {
 126         IKEV2_PROTOCOL_RESERVED = 0,
 127         IKEV2_PROTOCOL_IKE = 1, /* IKE is the only one allowed for EAP-IKEv2 */
 128         IKEV2_PROTOCOL_AH = 2,
 129         IKEV2_PROTOCOL_ESP = 3
 130 };
 131
 132
 133 /* IKEv2 Transform Types */
 134 enum {
 135         IKEV2_TRANSFORM_ENCR = 1,
 136         IKEV2_TRANSFORM_PRF = 2,
 137         IKEV2_TRANSFORM_INTEG = 3,
 138         IKEV2_TRANSFORM_DH = 4,
 139         IKEV2_TRANSFORM_ESN = 5
 140 };
 141
 142 /* IKEv2 Tranform Type 1 (Encryption Algorithm) */
 143 enum {
 144         ENCR_DES_IV64 = 1,
 145         ENCR_DES = 2,
 146         ENCR_3DES = 3,
 147         ENCR_RC5 = 4,
 148         ENCR_IDEA = 5,
 149         ENCR_CAST = 6,
 150         ENCR_BLOWFISH = 7,
 151         ENCR_3IDEA = 8,
 152         ENCR_DES_IV32 = 9,
 153         ENCR_NULL = 11,
 154         ENCR_AES_CBC = 12,
 155         ENCR_AES_CTR = 13
 156 };
 157
 158 /* IKEv2 Transform Type 2 (Pseudo-random Function) */
 159 enum {
 160         PRF_HMAC_MD5 = 1,
 161         PRF_HMAC_SHA1 = 2,
 162         PRF_HMAC_TIGER = 3,
 163         PRF_AES128_XCBC = 4
 164 };
 165
 166 /* IKEv2 Transform Type 3 (Integrity Algorithm) */
 167 enum {
 168         AUTH_HMAC_MD5_96 = 1,
 169         AUTH_HMAC_SHA1_96 = 2,
 170         AUTH_DES_MAC = 3,
 171         AUTH_KPDK_MD5 = 4,
 172         AUTH_AES_XCBC_96 = 5
 173 };
 174
 175 /* IKEv2 Transform Type 4 (Diffie-Hellman Group) */
 176 enum {
 177         DH_GROUP1_768BIT_MODP = 1, /* RFC 4306 */
 178         DH_GROUP2_1024BIT_MODP = 2, /* RFC 4306 */
 179         DH_GROUP5_1536BIT_MODP = 5, /* RFC 3526 */
 180         DH_GROUP5_2048BIT_MODP = 14, /* RFC 3526 */
 181         DH_GROUP5_3072BIT_MODP = 15, /* RFC 3526 */
 182         DH_GROUP5_4096BIT_MODP = 16, /* RFC 3526 */
 183         DH_GROUP5_6144BIT_MODP = 17, /* RFC 3526 */
 184         DH_GROUP5_8192BIT_MODP = 18 /* RFC 3526 */
 185 };
 186
 187
 188 /* Identification Data Types (RFC 4306, Sect. 3.5) */
 189 enum {
 190         ID_IPV4_ADDR = 1,
 191         ID_FQDN = 2,
 192         ID_RFC822_ADDR = 3,
 193         ID_IPV6_ADDR = 5,
 194         ID_DER_ASN1_DN = 9,
 195         ID_DER_ASN1_GN= 10,
 196         ID_KEY_ID = 11
 197 };
 198
 199
 200 /* Certificate Encoding (RFC 4306, Sect. 3.6) */
 201 enum {
 202         CERT_ENCODING_PKCS7_X509 = 1,
 203         CERT_ENCODING_PGP_CERT = 2,
 204         CERT_ENCODING_DNS_SIGNED_KEY = 3,
 205         /* X.509 Certificate - Signature: DER encoded X.509 certificate whose
 206          * public key is used to validate the sender's AUTH payload */
 207         CERT_ENCODING_X509_CERT_SIGN = 4,
 208         CERT_ENCODING_KERBEROS_TOKEN = 6,
 209         /* DER encoded X.509 certificate revocation list */
 210         CERT_ENCODING_CRL = 7,
 211         CERT_ENCODING_ARL = 8,
 212         CERT_ENCODING_SPKI_CERT = 9,
 213         CERT_ENCODING_X509_CERT_ATTR = 10,
 214         /* PKCS #1 encoded RSA key */
 215         CERT_ENCODING_RAW_RSA_KEY = 11,
 216         CERT_ENCODING_HASH_AND_URL_X509_CERT = 12,
 217         CERT_ENCODING_HASH_AND_URL_X509_BUNDLE = 13
 218 };
 219
 220
 221 /* Authentication Method (RFC 4306, Sect. 3.8) */
 222 enum {
 223         AUTH_RSA_SIGN = 1,
 224         AUTH_SHARED_KEY_MIC = 2,
 225         AUTH_DSS_SIGN = 3
 226 };
 227
 228
 229 /* Notify Message Types (RFC 4306, Sect. 3.10.1) */
 230 enum {
 231         UNSUPPORTED_CRITICAL_PAYLOAD = 1,
 232         INVALID_IKE_SPI = 4,
 233         INVALID_MAJOR_VERSION = 5,
 234         INVALID_SYNTAX = 7,
 235         INVALID_MESSAGE_ID = 9,
 236         INVALID_SPI = 11,
 237         NO_PROPOSAL_CHOSEN = 14,
 238         INVALID_KE_PAYLOAD = 17,
 239         AUTHENTICATION_FAILED = 24,
 240         SINGLE_PAIR_REQUIRED = 34,
 241         NO_ADDITIONAL_SAS = 35,
 242         INTERNAL_ADDRESS_FAILURE = 36,
 243         FAILED_CP_REQUIRED = 37,
 244         TS_UNACCEPTABLE = 38,
 245         INVALID_SELECTORS = 39
 246 };
 247
 248
 249 struct ikev2_keys {
 250         u8 *SK_d, *SK_ai, *SK_ar, *SK_ei, *SK_er, *SK_pi, *SK_pr;
 251         size_t SK_d_len, SK_integ_len, SK_encr_len, SK_prf_len;
 252 };
 253
 254
 255 int ikev2_keys_set(struct ikev2_keys *keys);
 256 void ikev2_free_keys(struct ikev2_keys *keys);
 257
 258
 259 /* Maximum hash length for supported hash algorithms */
 260 #define IKEV2_MAX_HASH_LEN 20
 261
 262 struct ikev2_integ_alg {
 263         int id;
 264         size_t key_len;
 265         size_t hash_len;
 266 };
 267
 268 struct ikev2_prf_alg {
 269         int id;
 270         size_t key_len;
 271         size_t hash_len;
 272 };
 273
 274 struct ikev2_encr_alg {
 275         int id;
 276         size_t key_len;
 277         size_t block_size;
 278 };
 279
 280 const struct ikev2_integ_alg * ikev2_get_integ(int id);
 281 int ikev2_integ_hash(int alg, const u8 *key, size_t key_len, const u8 *data,
 282                      size_t data_len, u8 *hash);
 283 const struct ikev2_prf_alg * ikev2_get_prf(int id);
 284 int ikev2_prf_hash(int alg, const u8 *key, size_t key_len,
 285                    size_t num_elem, const u8 *addr[], const size_t *len,
 286                    u8 *hash);
 287 int ikev2_prf_plus(int alg, const u8 *key, size_t key_len,
 288                    const u8 *data, size_t data_len,
 289                    u8 *out, size_t out_len);
 290 const struct ikev2_encr_alg * ikev2_get_encr(int id);
 291 int ikev2_encr_encrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
 292                        const u8 *plain, u8 *crypt, size_t len);
 293 int ikev2_encr_decrypt(int alg, const u8 *key, size_t key_len, const u8 *iv,
 294                        const u8 *crypt, u8 *plain, size_t len);
 295
 296 int ikev2_derive_auth_data(int prf_alg, const struct wpabuf *sign_msg,
 297                            const u8 *ID, size_t ID_len, u8 ID_type,
 298                            struct ikev2_keys *keys, int initiator,
 299                            const u8 *shared_secret, size_t shared_secret_len,
 300                            const u8 *nonce, size_t nonce_len,
 301                            const u8 *key_pad, size_t key_pad_len,
 302                            u8 *auth_data);
 303
 304
 305 struct ikev2_payloads {
 306         const u8 *sa;
 307         size_t sa_len;
 308         const u8 *ke;
 309         size_t ke_len;
 310         const u8 *idi;
 311         size_t idi_len;
 312         const u8 *idr;
 313         size_t idr_len;
 314         const u8 *cert;
 315         size_t cert_len;
 316         const u8 *auth;
 317         size_t auth_len;
 318         const u8 *nonce;
 319         size_t nonce_len;
 320         const u8 *encrypted;
 321         size_t encrypted_len;
 322         u8 encr_next_payload;
 323         const u8 *notification;
 324         size_t notification_len;
 325 };
 326
 327 int ikev2_parse_payloads(struct ikev2_payloads *payloads,
 328                          u8 next_payload, const u8 *pos, const u8 *end);
 329
 330 u8 * ikev2_decrypt_payload(int encr_id, int integ_id, struct ikev2_keys *keys,
 331                            int initiator, const struct ikev2_hdr *hdr,
 332                            const u8 *encrypted, size_t encrypted_len,
 333                            size_t *res_len);
 334 void ikev2_update_hdr(struct wpabuf *msg);
 335 int ikev2_build_encrypted(int encr_id, int integ_id, struct ikev2_keys *keys,
 336                           int initiator, struct wpabuf *msg,
 337                           struct wpabuf *plain, u8 next_payload);
 338 int ikev2_derive_sk_keys(const struct ikev2_prf_alg *prf,
 339                          const struct ikev2_integ_alg *integ,
 340                          const struct ikev2_encr_alg *encr,
 341                          const u8 *skeyseed, const u8 *data, size_t data_len,
 342                          struct ikev2_keys *keys);
 343
 344 #endif /* IKEV2_COMMON_H */