The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2011, 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 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/sctp_auth.h 221627 2011-05-08 09:11:59Z tuexen $");
   35 
   36 #ifndef __SCTP_AUTH_H__
   37 #define __SCTP_AUTH_H__
   38 
   39 
   40 /* digest lengths */
   41 #define SCTP_AUTH_DIGEST_LEN_SHA1       20
   42 #define SCTP_AUTH_DIGEST_LEN_SHA224     28
   43 #define SCTP_AUTH_DIGEST_LEN_SHA256     32
   44 #define SCTP_AUTH_DIGEST_LEN_SHA384     48
   45 #define SCTP_AUTH_DIGEST_LEN_SHA512     64
   46 #define SCTP_AUTH_DIGEST_LEN_MAX        64
   47 
   48 /* random sizes */
   49 #define SCTP_AUTH_RANDOM_SIZE_DEFAULT   32
   50 #define SCTP_AUTH_RANDOM_SIZE_REQUIRED  32
   51 #define SCTP_AUTH_RANDOM_SIZE_MAX       256
   52 
   53 /* union of all supported HMAC algorithm contexts */
   54 typedef union sctp_hash_context {
   55         SHA1_CTX sha1;
   56 #ifdef HAVE_SHA2
   57         SHA256_CTX sha256;
   58         SHA384_CTX sha384;
   59         SHA512_CTX sha512;
   60 #endif
   61 }                 sctp_hash_context_t;
   62 
   63 typedef struct sctp_key {
   64         uint32_t keylen;
   65         uint8_t key[];
   66 }        sctp_key_t;
   67 
   68 typedef struct sctp_shared_key {
   69         LIST_ENTRY(sctp_shared_key) next;
   70         sctp_key_t *key;        /* key text */
   71         uint32_t refcount;      /* reference count */
   72         uint16_t keyid;         /* shared key ID */
   73         uint8_t deactivated;    /* key is deactivated */
   74 }               sctp_sharedkey_t;
   75 
   76 LIST_HEAD(sctp_keyhead, sctp_shared_key);
   77 
   78 /* authentication chunks list */
   79 typedef struct sctp_auth_chklist {
   80         uint8_t chunks[256];
   81         uint8_t num_chunks;
   82 }                 sctp_auth_chklist_t;
   83 
   84 /* hmac algos supported list */
   85 typedef struct sctp_hmaclist {
   86         uint16_t max_algo;      /* max algorithms allocated */
   87         uint16_t num_algo;      /* num algorithms used */
   88         uint16_t hmac[];
   89 }             sctp_hmaclist_t;
   90 
   91 /* authentication info */
   92 typedef struct sctp_authinformation {
   93         sctp_key_t *random;     /* local random key (concatenated) */
   94         uint32_t random_len;    /* local random number length for param */
   95         sctp_key_t *peer_random;/* peer's random key (concatenated) */
   96         sctp_key_t *assoc_key;  /* cached concatenated send key */
   97         sctp_key_t *recv_key;   /* cached concatenated recv key */
   98         uint16_t active_keyid;  /* active send keyid */
   99         uint16_t assoc_keyid;   /* current send keyid (cached) */
  100         uint16_t recv_keyid;    /* last recv keyid (cached) */
  101 }                    sctp_authinfo_t;
  102 
  103 
  104 
  105 /*
  106  * Macros
  107  */
  108 #define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0))
  109 
  110 /*
  111  * function prototypes
  112  */
  113 
  114 /* socket option api functions */
  115 extern sctp_auth_chklist_t *sctp_alloc_chunklist(void);
  116 extern void sctp_free_chunklist(sctp_auth_chklist_t * chklist);
  117 extern void sctp_clear_chunklist(sctp_auth_chklist_t * chklist);
  118 extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t * chklist);
  119 extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
  120 extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
  121 extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list);
  122 extern void sctp_auth_set_default_chunks(sctp_auth_chklist_t * list);
  123 extern int 
  124 sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list,
  125     uint8_t * ptr);
  126 extern int 
  127 sctp_pack_auth_chunks(const sctp_auth_chklist_t * list,
  128     uint8_t * ptr);
  129 extern int 
  130 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 *
  141 sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2,
  142     sctp_key_t * shared);
  143 
  144 /* shared key handling */
  145 extern sctp_sharedkey_t *sctp_alloc_sharedkey(void);
  146 extern void sctp_free_sharedkey(sctp_sharedkey_t * skey);
  147 extern sctp_sharedkey_t *
  148 sctp_find_sharedkey(struct sctp_keyhead *shared_keys,
  149     uint16_t key_id);
  150 extern int 
  151 sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
  152     sctp_sharedkey_t * new_skey);
  153 extern int 
  154 sctp_copy_skeylist(const struct sctp_keyhead *src,
  155     struct sctp_keyhead *dest);
  156 
  157 /* ref counts on shared keys, by key id */
  158 extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid);
  159 extern void 
  160 sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid,
  161     int so_locked);
  162 
  163 
  164 /* hmac list handling */
  165 extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint8_t num_hmacs);
  166 extern void sctp_free_hmaclist(sctp_hmaclist_t * list);
  167 extern int sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id);
  168 extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t * list);
  169 extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void);
  170 extern uint16_t 
  171 sctp_negotiate_hmacid(sctp_hmaclist_t * peer,
  172     sctp_hmaclist_t * local);
  173 extern int sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr);
  174 extern int 
  175 sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs,
  176     uint32_t num_hmacs);
  177 
  178 extern sctp_authinfo_t *sctp_alloc_authinfo(void);
  179 extern void sctp_free_authinfo(sctp_authinfo_t * authinfo);
  180 
  181 /* keyed-HMAC functions */
  182 extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo);
  183 extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo);
  184 extern uint32_t 
  185 sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  186     uint8_t * text, uint32_t textlen, uint8_t * digest);
  187 extern int 
  188 sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  189     uint8_t * text, uint32_t textlen, uint8_t * digest, uint32_t digestlen);
  190 extern uint32_t 
  191 sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key,
  192     uint8_t * text, uint32_t textlen, uint8_t * digest);
  193 extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id);
  194 
  195 /* mbuf versions */
  196 extern uint32_t 
  197 sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
  198     struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer);
  199 extern uint32_t 
  200 sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key,
  201     struct mbuf *m, uint32_t m_offset, uint8_t * digest);
  202 
  203 /*
  204  * authentication routines
  205  */
  206 extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid);
  207 extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid);
  208 extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
  209 extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  210 extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid);
  211 extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  212 extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
  213 extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
  214 
  215 extern void 
  216 sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
  217     uint32_t offset, uint32_t length);
  218 extern void 
  219 sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
  220     struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id);
  221 extern struct mbuf *
  222 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
  223     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
  224     struct sctp_tcb *stcb, uint8_t chunk);
  225 extern int 
  226 sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch,
  227     struct mbuf *m, uint32_t offset);
  228 extern void 
  229 sctp_notify_authentication(struct sctp_tcb *stcb,
  230     uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked);
  231 extern int 
  232 sctp_validate_init_auth_params(struct mbuf *m, int offset,
  233     int limit);
  234 extern void 
  235 sctp_initialize_auth_params(struct sctp_inpcb *inp,
  236     struct sctp_tcb *stcb);
  237 
  238 /* test functions */
  239 #endif                          /* __SCTP_AUTH_H__ */

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