1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD$"); 37 38#ifndef _NETINET_SCTP_AUTH_H_ 39#define _NETINET_SCTP_AUTH_H_ 40 41#include <netinet/sctp_os.h> 42 43/* digest lengths */ 44#define SCTP_AUTH_DIGEST_LEN_SHA1 20 45#define SCTP_AUTH_DIGEST_LEN_SHA256 32 46#define SCTP_AUTH_DIGEST_LEN_MAX SCTP_AUTH_DIGEST_LEN_SHA256 47 48/* random sizes */ 49#define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32 50#define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32 51 52/* union of all supported HMAC algorithm contexts */ 53typedef union sctp_hash_context { 54 SCTP_SHA1_CTX sha1; 55 SCTP_SHA256_CTX sha256; 56} sctp_hash_context_t; 57 58typedef struct sctp_key { 59 uint32_t keylen; 60 uint8_t key[]; 61} sctp_key_t; 62 63typedef struct sctp_shared_key { 64 LIST_ENTRY(sctp_shared_key) next; 65 sctp_key_t *key; /* key text */ 66 uint32_t refcount; /* reference count */ 67 uint16_t keyid; /* shared key ID */ 68 uint8_t deactivated; /* key is deactivated */ 69} sctp_sharedkey_t; 70 71LIST_HEAD(sctp_keyhead, sctp_shared_key); 72 73/* authentication chunks list */ 74typedef struct sctp_auth_chklist { 75 uint8_t chunks[256]; 76 uint8_t num_chunks; 77} sctp_auth_chklist_t; 78 79/* hmac algos supported list */ 80typedef struct sctp_hmaclist { 81 uint16_t max_algo; /* max algorithms allocated */ 82 uint16_t num_algo; /* num algorithms used */ 83 uint16_t hmac[]; 84} sctp_hmaclist_t; 85 86/* authentication info */ 87typedef struct sctp_authinformation { 88 sctp_key_t *random; /* local random key (concatenated) */ 89 uint32_t random_len; /* local random number length for param */ 90 sctp_key_t *peer_random; /* peer's random key (concatenated) */ 91 sctp_key_t *assoc_key; /* cached concatenated send key */ 92 sctp_key_t *recv_key; /* cached concatenated recv key */ 93 uint16_t active_keyid; /* active send keyid */ 94 uint16_t assoc_keyid; /* current send keyid (cached) */ 95 uint16_t recv_keyid; /* last recv keyid (cached) */ 96} sctp_authinfo_t; 97 98/* 99 * Macros 100 */ 101#define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0)) 102 103/* 104 * function prototypes 105 */ 106 107/* socket option api functions */ 108extern sctp_auth_chklist_t *sctp_alloc_chunklist(void); 109extern void sctp_free_chunklist(sctp_auth_chklist_t *chklist); 110extern void sctp_clear_chunklist(sctp_auth_chklist_t *chklist); 111extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t *chklist); 112extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t *list); 113extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t *list); 114extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t *list); 115extern int 116sctp_serialize_auth_chunks(const sctp_auth_chklist_t *list, 117 uint8_t *ptr); 118extern int 119sctp_pack_auth_chunks(const sctp_auth_chklist_t *list, 120 uint8_t *ptr); 121extern int 122sctp_unpack_auth_chunks(const uint8_t *ptr, uint8_t num_chunks, 123 sctp_auth_chklist_t *list); 124 125/* key handling */ 126extern sctp_key_t *sctp_alloc_key(uint32_t keylen); 127extern void sctp_free_key(sctp_key_t *key); 128extern void sctp_print_key(sctp_key_t *key, const char *str); 129extern void sctp_show_key(sctp_key_t *key, const char *str); 130extern sctp_key_t *sctp_generate_random_key(uint32_t keylen); 131extern sctp_key_t *sctp_set_key(uint8_t *key, uint32_t keylen); 132extern sctp_key_t * 133sctp_compute_hashkey(sctp_key_t *key1, sctp_key_t *key2, 134 sctp_key_t *shared); 135 136/* shared key handling */ 137extern sctp_sharedkey_t *sctp_alloc_sharedkey(void); 138extern void sctp_free_sharedkey(sctp_sharedkey_t *skey); 139extern sctp_sharedkey_t * 140sctp_find_sharedkey(struct sctp_keyhead *shared_keys, 141 uint16_t key_id); 142extern int 143sctp_insert_sharedkey(struct sctp_keyhead *shared_keys, 144 sctp_sharedkey_t *new_skey); 145extern int 146sctp_copy_skeylist(const struct sctp_keyhead *src, 147 struct sctp_keyhead *dest); 148 149/* ref counts on shared keys, by key id */ 150extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid); 151extern void 152sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid, 153 int so_locked); 154 155/* hmac list handling */ 156extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint16_t num_hmacs); 157extern void sctp_free_hmaclist(sctp_hmaclist_t *list); 158extern int sctp_auth_add_hmacid(sctp_hmaclist_t *list, uint16_t hmac_id); 159extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t *list); 160extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void); 161extern uint16_t 162sctp_negotiate_hmacid(sctp_hmaclist_t *peer, 163 sctp_hmaclist_t *local); 164extern int sctp_serialize_hmaclist(sctp_hmaclist_t *list, uint8_t *ptr); 165extern int 166sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs, 167 uint32_t num_hmacs); 168 169extern sctp_authinfo_t *sctp_alloc_authinfo(void); 170extern void sctp_free_authinfo(sctp_authinfo_t *authinfo); 171 172/* keyed-HMAC functions */ 173extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo); 174extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo); 175extern uint32_t 176sctp_hmac(uint16_t hmac_algo, uint8_t *key, uint32_t keylen, 177 uint8_t *text, uint32_t textlen, uint8_t *digest); 178extern uint32_t 179sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t *key, 180 uint8_t *text, uint32_t textlen, uint8_t *digest); 181extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t *list, uint16_t id); 182 183/* mbuf versions */ 184extern uint32_t 185sctp_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); 187extern uint32_t 188sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t *key, 189 struct mbuf *m, uint32_t m_offset, uint8_t *digest); 190 191/* 192 * authentication routines 193 */ 194extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid); 195extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid); 196extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid); 197extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid); 198extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid); 199extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid); 200extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid); 201extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid); 202 203extern void 204sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m, 205 uint32_t offset, uint32_t length); 206extern void 207sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset, 208 struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id); 209extern struct mbuf * 210sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end, 211 struct sctp_auth_chunk **auth_ret, uint32_t *offset, 212 struct sctp_tcb *stcb, uint8_t chunk); 213extern int 214sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch, 215 struct mbuf *m, uint32_t offset); 216extern void 217sctp_notify_authentication(struct sctp_tcb *stcb, 218 uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked); 219extern int 220sctp_validate_init_auth_params(struct mbuf *m, int offset, 221 int limit); 222extern void 223sctp_initialize_auth_params(struct sctp_inpcb *inp, 224 struct sctp_tcb *stcb); 225 226/* test functions */ 227#endif /* __SCTP_AUTH_H__ */ 228