1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef __FreeBSD__ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_auth.h 235828 2012-05-23 11:26:28Z tuexen $"); 36 #endif 37 38 #ifndef _NETINET_SCTP_AUTH_H_ 39 #define _NETINET_SCTP_AUTH_H_ 40 41 #include <netinet/sctp_sha1.h> 42 43 /* digest lengths */ 44 #define SCTP_AUTH_DIGEST_LEN_SHA1 20 45 #define SCTP_AUTH_DIGEST_LEN_SHA224 28 46 #define SCTP_AUTH_DIGEST_LEN_SHA256 32 47 #define SCTP_AUTH_DIGEST_LEN_SHA384 48 48 #define SCTP_AUTH_DIGEST_LEN_SHA512 64 49 #define SCTP_AUTH_DIGEST_LEN_MAX 64 50 51 /* random sizes */ 52 #define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32 53 #define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32 54 #define SCTP_AUTH_RANDOM_SIZE_MAX 256 55 56 /* union of all supported HMAC algorithm contexts */ 57 typedef union sctp_hash_context { 58 SHA1_CTX sha1; 59 #ifdef HAVE_SHA2 60 SHA256_CTX sha256; 61 SHA384_CTX sha384; 62 SHA512_CTX sha512; 63 #endif 64 } sctp_hash_context_t; 65 66 typedef struct sctp_key { 67 uint32_t keylen; 68 uint8_t key[]; 69 } sctp_key_t; 70 71 typedef struct sctp_shared_key { 72 LIST_ENTRY(sctp_shared_key) next; 73 sctp_key_t *key; /* key text */ 74 uint32_t refcount; /* reference count */ 75 uint16_t keyid; /* shared key ID */ 76 uint8_t deactivated; /* key is deactivated */ 77 } sctp_sharedkey_t; 78 79 LIST_HEAD(sctp_keyhead, sctp_shared_key); 80 81 /* authentication chunks list */ 82 typedef struct sctp_auth_chklist { 83 uint8_t chunks[256]; 84 uint8_t num_chunks; 85 } sctp_auth_chklist_t; 86 87 /* hmac algos supported list */ 88 typedef struct sctp_hmaclist { 89 uint16_t max_algo; /* max algorithms allocated */ 90 uint16_t num_algo; /* num algorithms used */ 91 uint16_t hmac[]; 92 } sctp_hmaclist_t; 93 94 /* authentication info */ 95 typedef struct sctp_authinformation { 96 sctp_key_t *random; /* local random key (concatenated) */ 97 uint32_t random_len; /* local random number length for param */ 98 sctp_key_t *peer_random;/* peer's random key (concatenated) */ 99 sctp_key_t *assoc_key; /* cached concatenated send key */ 100 sctp_key_t *recv_key; /* cached concatenated recv key */ 101 uint16_t active_keyid; /* active send keyid */ 102 uint16_t assoc_keyid; /* current send keyid (cached) */ 103 uint16_t recv_keyid; /* last recv keyid (cached) */ 104 } sctp_authinfo_t; 105 106 107 108 /* 109 * Macros 110 */ 111 #define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0)) 112 113 /* 114 * function prototypes 115 */ 116 117 /* socket option api functions */ 118 extern sctp_auth_chklist_t *sctp_alloc_chunklist(void); 119 extern void sctp_free_chunklist(sctp_auth_chklist_t *chklist); 120 extern void sctp_clear_chunklist(sctp_auth_chklist_t *chklist); 121 extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t *chklist); 122 extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t *list); 123 extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t *list); 124 extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t *list); 125 extern void sctp_auth_set_default_chunks(sctp_auth_chklist_t *list); 126 extern int sctp_serialize_auth_chunks(const sctp_auth_chklist_t *list, 127 uint8_t *ptr); 128 extern int sctp_pack_auth_chunks(const sctp_auth_chklist_t *list, 129 uint8_t *ptr); 130 extern int sctp_unpack_auth_chunks(const uint8_t *ptr, uint8_t num_chunks, 131 sctp_auth_chklist_t *list); 132 133 /* key handling */ 134 extern sctp_key_t *sctp_alloc_key(uint32_t keylen); 135 extern void sctp_free_key(sctp_key_t *key); 136 extern void sctp_print_key(sctp_key_t *key, const char *str); 137 extern void sctp_show_key(sctp_key_t *key, const char *str); 138 extern sctp_key_t *sctp_generate_random_key(uint32_t keylen); 139 extern sctp_key_t *sctp_set_key(uint8_t *key, uint32_t keylen); 140 extern sctp_key_t *sctp_compute_hashkey(sctp_key_t *key1, sctp_key_t *key2, 141 sctp_key_t *shared); 142 143 /* shared key handling */ 144 extern sctp_sharedkey_t *sctp_alloc_sharedkey(void); 145 extern void sctp_free_sharedkey(sctp_sharedkey_t *skey); 146 extern sctp_sharedkey_t *sctp_find_sharedkey(struct sctp_keyhead *shared_keys, 147 uint16_t key_id); 148 extern int sctp_insert_sharedkey(struct sctp_keyhead *shared_keys, 149 sctp_sharedkey_t *new_skey); 150 extern int sctp_copy_skeylist(const struct sctp_keyhead *src, 151 struct sctp_keyhead *dest); 152 /* ref counts on shared keys, by key id */ 153 extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid); 154 extern void sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid, 155 int so_locked); 156 157 158 /* hmac list handling */ 159 extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint8_t num_hmacs); 160 extern void sctp_free_hmaclist(sctp_hmaclist_t *list); 161 extern int sctp_auth_add_hmacid(sctp_hmaclist_t *list, uint16_t hmac_id); 162 extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t *list); 163 extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void); 164 extern uint16_t sctp_negotiate_hmacid(sctp_hmaclist_t *peer, 165 sctp_hmaclist_t *local); 166 extern int sctp_serialize_hmaclist(sctp_hmaclist_t *list, uint8_t *ptr); 167 extern int sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs, 168 uint32_t num_hmacs); 169 170 extern sctp_authinfo_t *sctp_alloc_authinfo(void); 171 extern void sctp_free_authinfo(sctp_authinfo_t *authinfo); 172 173 /* keyed-HMAC functions */ 174 extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo); 175 extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo); 176 extern uint32_t sctp_hmac(uint16_t hmac_algo, uint8_t *key, uint32_t keylen, 177 uint8_t *text, uint32_t textlen, uint8_t *digest); 178 extern int sctp_verify_hmac(uint16_t hmac_algo, uint8_t *key, uint32_t keylen, 179 uint8_t *text, uint32_t textlen, uint8_t *digest, uint32_t digestlen); 180 extern uint32_t sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t *key, 181 uint8_t *text, uint32_t textlen, uint8_t *digest); 182 extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t *list, uint16_t id); 183 184 /* mbuf versions */ 185 extern uint32_t sctp_hmac_m(uint16_t hmac_algo, uint8_t *key, uint32_t keylen, 186 struct mbuf *m, uint32_t m_offset, uint8_t *digest, uint32_t trailer); 187 extern uint32_t sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t *key, 188 struct mbuf *m, uint32_t m_offset, uint8_t *digest); 189 190 /* 191 * authentication routines 192 */ 193 extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid); 194 extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid); 195 extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid); 196 extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid); 197 extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid); 198 extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid); 199 extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid); 200 extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid); 201 202 extern void sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m, 203 uint32_t offset, uint32_t length); 204 extern void sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset, 205 struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id); 206 extern struct mbuf *sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end, 207 struct sctp_auth_chunk **auth_ret, uint32_t *offset, 208 struct sctp_tcb *stcb, uint8_t chunk); 209 extern int sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch, 210 struct mbuf *m, uint32_t offset); 211 extern void sctp_notify_authentication(struct sctp_tcb *stcb, 212 uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked); 213 extern int sctp_validate_init_auth_params(struct mbuf *m, int offset, 214 int limit); 215 extern void sctp_initialize_auth_params(struct sctp_inpcb *inp, 216 struct sctp_tcb *stcb); 217 218 /* test functions */ 219 #ifdef SCTP_HMAC_TEST 220 extern void sctp_test_hmac_sha1(void); 221 extern void sctp_test_authkey(void); 222 #endif 223 #endif /* __SCTP_AUTH_H__ */ 224
