sys/netinet/sctp_auth.h

   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 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #ifndef _NETINET_SCTP_AUTH_H_
  37 #define _NETINET_SCTP_AUTH_H_
  38
  39 #include <netinet/sctp_os.h>
  40
  41 /* digest lengths */
  42 #define SCTP_AUTH_DIGEST_LEN_SHA1       20
  43 #define SCTP_AUTH_DIGEST_LEN_SHA256     32
  44 #define SCTP_AUTH_DIGEST_LEN_MAX        SCTP_AUTH_DIGEST_LEN_SHA256
  45
  46 /* random sizes */
  47 #define SCTP_AUTH_RANDOM_SIZE_DEFAULT   32
  48 #define SCTP_AUTH_RANDOM_SIZE_REQUIRED  32
  49
  50 /* union of all supported HMAC algorithm contexts */
  51 typedef union sctp_hash_context {
  52         SCTP_SHA1_CTX sha1;
  53         SCTP_SHA256_CTX sha256;
  54 }                 sctp_hash_context_t;
  55
  56 typedef struct sctp_key {
  57         uint32_t keylen;
  58         uint8_t key[];
  59 }        sctp_key_t;
  60
  61 typedef struct sctp_shared_key {
  62         LIST_ENTRY(sctp_shared_key) next;
  63         sctp_key_t *key;        /* key text */
  64         uint32_t refcount;      /* reference count */
  65         uint16_t keyid;         /* shared key ID */
  66         uint8_t deactivated;    /* key is deactivated */
  67 }               sctp_sharedkey_t;
  68
  69 LIST_HEAD(sctp_keyhead, sctp_shared_key);
  70
  71 /* authentication chunks list */
  72 typedef struct sctp_auth_chklist {
  73         uint8_t chunks[256];
  74         uint8_t num_chunks;
  75 }                 sctp_auth_chklist_t;
  76
  77 /* hmac algos supported list */
  78 typedef struct sctp_hmaclist {
  79         uint16_t max_algo;      /* max algorithms allocated */
  80         uint16_t num_algo;      /* num algorithms used */
  81         uint16_t hmac[];
  82 }             sctp_hmaclist_t;
  83
  84 /* authentication info */
  85 typedef struct sctp_authinformation {
  86         sctp_key_t *random;     /* local random key (concatenated) */
  87         uint32_t random_len;    /* local random number length for param */
  88         sctp_key_t *peer_random;/* peer's random key (concatenated) */
  89         sctp_key_t *assoc_key;  /* cached concatenated send key */
  90         sctp_key_t *recv_key;   /* cached concatenated recv key */
  91         uint16_t active_keyid;  /* active send keyid */
  92         uint16_t assoc_keyid;   /* current send keyid (cached) */
  93         uint16_t recv_keyid;    /* last recv keyid (cached) */
  94 }                    sctp_authinfo_t;
  95
  96
  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 */
 108 extern sctp_auth_chklist_t *sctp_alloc_chunklist(void);
 109 extern void sctp_free_chunklist(sctp_auth_chklist_t * chklist);
 110 extern void sctp_clear_chunklist(sctp_auth_chklist_t * chklist);
 111 extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t * chklist);
 112 extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
 113 extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
 114 extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list);
 115 extern int
 116 sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list,
 117     uint8_t * ptr);
 118 extern int
 119 sctp_pack_auth_chunks(const sctp_auth_chklist_t * list,
 120     uint8_t * ptr);
 121 extern int
 122 sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks,
 123     sctp_auth_chklist_t * list);
 124
 125 /* key handling */
 126 extern sctp_key_t *sctp_alloc_key(uint32_t keylen);
 127 extern void sctp_free_key(sctp_key_t * key);
 128 extern void sctp_print_key(sctp_key_t * key, const char *str);
 129 extern void sctp_show_key(sctp_key_t * key, const char *str);
 130 extern sctp_key_t *sctp_generate_random_key(uint32_t keylen);
 131 extern sctp_key_t *sctp_set_key(uint8_t * key, uint32_t keylen);
 132 extern sctp_key_t *
 133 sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2,
 134     sctp_key_t * shared);
 135
 136 /* shared key handling */
 137 extern sctp_sharedkey_t *sctp_alloc_sharedkey(void);
 138 extern void sctp_free_sharedkey(sctp_sharedkey_t * skey);
 139 extern sctp_sharedkey_t *
 140 sctp_find_sharedkey(struct sctp_keyhead *shared_keys,
 141     uint16_t key_id);
 142 extern int
 143 sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
 144     sctp_sharedkey_t * new_skey);
 145 extern int
 146 sctp_copy_skeylist(const struct sctp_keyhead *src,
 147     struct sctp_keyhead *dest);
 148
 149 /* ref counts on shared keys, by key id */
 150 extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid);
 151 extern void
 152 sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid,
 153     int so_locked);
 154
 155
 156 /* hmac list handling */
 157 extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint16_t num_hmacs);
 158 extern void sctp_free_hmaclist(sctp_hmaclist_t * list);
 159 extern int sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id);
 160 extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t * list);
 161 extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void);
 162 extern uint16_t
 163 sctp_negotiate_hmacid(sctp_hmaclist_t * peer,
 164     sctp_hmaclist_t * local);
 165 extern int sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr);
 166 extern int
 167 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
 177 sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
 178     uint8_t * text, uint32_t textlen, uint8_t * digest);
 179 extern int
 180 sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
 181     uint8_t * text, uint32_t textlen, uint8_t * digest, uint32_t digestlen);
 182 extern uint32_t
 183 sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key,
 184     uint8_t * text, uint32_t textlen, uint8_t * digest);
 185 extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id);
 186
 187 /* mbuf versions */
 188 extern uint32_t
 189 sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
 190     struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer);
 191 extern uint32_t
 192 sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key,
 193     struct mbuf *m, uint32_t m_offset, uint8_t * digest);
 194
 195 /*
 196  * authentication routines
 197  */
 198 extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid);
 199 extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid);
 200 extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
 201 extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
 202 extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid);
 203 extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid);
 204 extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
 205 extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
 206
 207 extern void
 208 sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
 209     uint32_t offset, uint32_t length);
 210 extern void
 211 sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
 212     struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id);
 213 extern struct mbuf *
 214 sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
 215     struct sctp_auth_chunk **auth_ret, uint32_t * offset,
 216     struct sctp_tcb *stcb, uint8_t chunk);
 217 extern int
 218 sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch,
 219     struct mbuf *m, uint32_t offset);
 220 extern void
 221 sctp_notify_authentication(struct sctp_tcb *stcb,
 222     uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked);
 223 extern int
 224 sctp_validate_init_auth_params(struct mbuf *m, int offset,
 225     int limit);
 226 extern void
 227 sctp_initialize_auth_params(struct sctp_inpcb *inp,
 228     struct sctp_tcb *stcb);
 229
 230 /* test functions */
 231 #endif                          /* __SCTP_AUTH_H__ */