The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_auth.h

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    1 /*-
    2  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions are met:
    6  *
    7  * a) Redistributions of source code must retain the above copyright notice,
    8  *   this list of conditions and the following disclaimer.
    9  *
   10  * b) Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in
   12  *   the documentation and/or other materials provided with the distribution.
   13  *
   14  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   15  *    contributors may be used to endorse or promote products derived
   16  *    from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   20  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   28  * THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/8.1/sys/netinet/sctp_auth.h 206732 2010-04-17 03:57:16Z rrs $");
   33 
   34 #ifndef __SCTP_AUTH_H__
   35 #define __SCTP_AUTH_H__
   36 
   37 
   38 /* digest lengths */
   39 #define SCTP_AUTH_DIGEST_LEN_SHA1       20
   40 #define SCTP_AUTH_DIGEST_LEN_SHA224     28
   41 #define SCTP_AUTH_DIGEST_LEN_SHA256     32
   42 #define SCTP_AUTH_DIGEST_LEN_SHA384     48
   43 #define SCTP_AUTH_DIGEST_LEN_SHA512     64
   44 #define SCTP_AUTH_DIGEST_LEN_MAX        64
   45 
   46 /* random sizes */
   47 #define SCTP_AUTH_RANDOM_SIZE_DEFAULT   32
   48 #define SCTP_AUTH_RANDOM_SIZE_REQUIRED  32
   49 #define SCTP_AUTH_RANDOM_SIZE_MAX       256
   50 
   51 /* union of all supported HMAC algorithm contexts */
   52 typedef union sctp_hash_context {
   53         SHA1_CTX sha1;
   54 #ifdef HAVE_SHA2
   55         SHA256_CTX sha256;
   56         SHA384_CTX sha384;
   57         SHA512_CTX sha512;
   58 #endif
   59 }                 sctp_hash_context_t;
   60 
   61 typedef struct sctp_key {
   62         uint32_t keylen;
   63         uint8_t key[];
   64 }        sctp_key_t;
   65 
   66 typedef struct sctp_shared_key {
   67         LIST_ENTRY(sctp_shared_key) next;
   68         sctp_key_t *key;        /* key text */
   69         uint32_t refcount;      /* reference count */
   70         uint16_t keyid;         /* shared key ID */
   71         uint8_t deactivated;    /* key is deactivated */
   72 }               sctp_sharedkey_t;
   73 
   74 LIST_HEAD(sctp_keyhead, sctp_shared_key);
   75 
   76 /* authentication chunks list */
   77 typedef struct sctp_auth_chklist {
   78         uint8_t chunks[256];
   79         uint8_t num_chunks;
   80 }                 sctp_auth_chklist_t;
   81 
   82 /* hmac algos supported list */
   83 typedef struct sctp_hmaclist {
   84         uint16_t max_algo;      /* max algorithms allocated */
   85         uint16_t num_algo;      /* num algorithms used */
   86         uint16_t hmac[];
   87 }             sctp_hmaclist_t;
   88 
   89 /* authentication info */
   90 typedef struct sctp_authinfo {
   91         sctp_key_t *random;     /* local random key (concatenated) */
   92         uint32_t random_len;    /* local random number length for param */
   93         sctp_key_t *peer_random;/* peer's random key (concatenated) */
   94         sctp_key_t *assoc_key;  /* cached concatenated send key */
   95         sctp_key_t *recv_key;   /* cached concatenated recv key */
   96         uint16_t active_keyid;  /* active send keyid */
   97         uint16_t assoc_keyid;   /* current send keyid (cached) */
   98         uint16_t recv_keyid;    /* last recv keyid (cached) */
   99 }             sctp_authinfo_t;
  100 
  101 
  102 
  103 /*
  104  * Macros
  105  */
  106 #define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0))
  107 
  108 /*
  109  * function prototypes
  110  */
  111 
  112 /* socket option api functions */
  113 extern sctp_auth_chklist_t *sctp_alloc_chunklist(void);
  114 extern void sctp_free_chunklist(sctp_auth_chklist_t * chklist);
  115 extern void sctp_clear_chunklist(sctp_auth_chklist_t * chklist);
  116 extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t * chklist);
  117 extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
  118 extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
  119 extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list);
  120 extern void sctp_auth_set_default_chunks(sctp_auth_chklist_t * list);
  121 extern int 
  122 sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list,
  123     uint8_t * ptr);
  124 extern int 
  125 sctp_pack_auth_chunks(const sctp_auth_chklist_t * list,
  126     uint8_t * ptr);
  127 extern int 
  128 sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks,
  129     sctp_auth_chklist_t * list);
  130 
  131 /* key handling */
  132 extern sctp_key_t *sctp_alloc_key(uint32_t keylen);
  133 extern void sctp_free_key(sctp_key_t * key);
  134 extern void sctp_print_key(sctp_key_t * key, const char *str);
  135 extern void sctp_show_key(sctp_key_t * key, const char *str);
  136 extern sctp_key_t *sctp_generate_random_key(uint32_t keylen);
  137 extern sctp_key_t *sctp_set_key(uint8_t * key, uint32_t keylen);
  138 extern sctp_key_t *
  139 sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2,
  140     sctp_key_t * shared);
  141 
  142 /* shared key handling */
  143 extern sctp_sharedkey_t *sctp_alloc_sharedkey(void);
  144 extern void sctp_free_sharedkey(sctp_sharedkey_t * skey);
  145 extern sctp_sharedkey_t *
  146 sctp_find_sharedkey(struct sctp_keyhead *shared_keys,
  147     uint16_t key_id);
  148 extern int 
  149 sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
  150     sctp_sharedkey_t * new_skey);
  151 extern int 
  152 sctp_copy_skeylist(const struct sctp_keyhead *src,
  153     struct sctp_keyhead *dest);
  154 
  155 /* ref counts on shared keys, by key id */
  156 extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid);
  157 extern void sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid);
  158 
  159 
  160 /* hmac list handling */
  161 extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint8_t num_hmacs);
  162 extern void sctp_free_hmaclist(sctp_hmaclist_t * list);
  163 extern int sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id);
  164 extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t * list);
  165 extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void);
  166 extern uint16_t 
  167 sctp_negotiate_hmacid(sctp_hmaclist_t * peer,
  168     sctp_hmaclist_t * local);
  169 extern int sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr);
  170 extern int 
  171 sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs,
  172     uint32_t num_hmacs);
  173 
  174 extern sctp_authinfo_t *sctp_alloc_authinfo(void);
  175 extern void sctp_free_authinfo(sctp_authinfo_t * authinfo);
  176 
  177 /* keyed-HMAC functions */
  178 extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo);
  179 extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo);
  180 extern uint32_t 
  181 sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  182     uint8_t * text, uint32_t textlen, uint8_t * digest);
  183 extern int 
  184 sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  185     uint8_t * text, uint32_t textlen, uint8_t * digest, uint32_t digestlen);
  186 extern uint32_t 
  187 sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key,
  188     uint8_t * text, uint32_t textlen, uint8_t * digest);
  189 extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id);
  190 
  191 /* mbuf versions */
  192 extern uint32_t 
  193 sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  194     struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer);
  195 extern uint32_t 
  196 sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key,
  197     struct mbuf *m, uint32_t m_offset, uint8_t * digest);
  198 
  199 /*
  200  * authentication routines
  201  */
  202 extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid);
  203 extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid);
  204 extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
  205 extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  206 extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid);
  207 extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  208 extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
  209 extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  210 
  211 extern void 
  212 sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
  213     uint32_t offset, uint32_t length);
  214 extern void 
  215 sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
  216     struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id);
  217 extern struct mbuf *
  218 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
  219     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
  220     struct sctp_tcb *stcb, uint8_t chunk);
  221 extern int 
  222 sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch,
  223     struct mbuf *m, uint32_t offset);
  224 extern void 
  225 sctp_notify_authentication(struct sctp_tcb *stcb,
  226     uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked);
  227 extern int 
  228 sctp_validate_init_auth_params(struct mbuf *m, int offset,
  229     int limit);
  230 extern void 
  231 sctp_initialize_auth_params(struct sctp_inpcb *inp,
  232     struct sctp_tcb *stcb);
  233 
  234 /* test functions */
  235 #endif                          /* __SCTP_AUTH_H__ */

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