240 lines
9.0 KiB
C
240 lines
9.0 KiB
C
/*-
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* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
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* Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef __SCTP_AUTH_H__
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#define __SCTP_AUTH_H__
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/* digest lengths */
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#define SCTP_AUTH_DIGEST_LEN_SHA1 20
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#define SCTP_AUTH_DIGEST_LEN_SHA224 28
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#define SCTP_AUTH_DIGEST_LEN_SHA256 32
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#define SCTP_AUTH_DIGEST_LEN_SHA384 48
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#define SCTP_AUTH_DIGEST_LEN_SHA512 64
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#define SCTP_AUTH_DIGEST_LEN_MAX 64
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/* random sizes */
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#define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32
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#define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32
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#define SCTP_AUTH_RANDOM_SIZE_MAX 256
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/* union of all supported HMAC algorithm contexts */
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typedef union sctp_hash_context {
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SHA1_CTX sha1;
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#ifdef HAVE_SHA2
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SHA256_CTX sha256;
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SHA384_CTX sha384;
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SHA512_CTX sha512;
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#endif
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} sctp_hash_context_t;
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typedef struct sctp_key {
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uint32_t keylen;
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uint8_t key[];
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} sctp_key_t;
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typedef struct sctp_shared_key {
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LIST_ENTRY(sctp_shared_key) next;
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sctp_key_t *key; /* key text */
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uint32_t refcount; /* reference count */
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uint16_t keyid; /* shared key ID */
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uint8_t deactivated; /* key is deactivated */
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} sctp_sharedkey_t;
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LIST_HEAD(sctp_keyhead, sctp_shared_key);
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/* authentication chunks list */
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typedef struct sctp_auth_chklist {
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uint8_t chunks[256];
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uint8_t num_chunks;
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} sctp_auth_chklist_t;
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/* hmac algos supported list */
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typedef struct sctp_hmaclist {
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uint16_t max_algo; /* max algorithms allocated */
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uint16_t num_algo; /* num algorithms used */
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uint16_t hmac[];
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} sctp_hmaclist_t;
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/* authentication info */
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typedef struct sctp_authinformation {
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sctp_key_t *random; /* local random key (concatenated) */
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uint32_t random_len; /* local random number length for param */
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sctp_key_t *peer_random;/* peer's random key (concatenated) */
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sctp_key_t *assoc_key; /* cached concatenated send key */
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sctp_key_t *recv_key; /* cached concatenated recv key */
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uint16_t active_keyid; /* active send keyid */
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uint16_t assoc_keyid; /* current send keyid (cached) */
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uint16_t recv_keyid; /* last recv keyid (cached) */
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} sctp_authinfo_t;
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/*
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* Macros
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*/
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#define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0))
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/*
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* function prototypes
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*/
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/* socket option api functions */
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extern sctp_auth_chklist_t *sctp_alloc_chunklist(void);
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extern void sctp_free_chunklist(sctp_auth_chklist_t * chklist);
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extern void sctp_clear_chunklist(sctp_auth_chklist_t * chklist);
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extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t * chklist);
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extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
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extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
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extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list);
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extern void sctp_auth_set_default_chunks(sctp_auth_chklist_t * list);
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extern int
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sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list,
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uint8_t * ptr);
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extern int
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sctp_pack_auth_chunks(const sctp_auth_chklist_t * list,
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uint8_t * ptr);
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extern int
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sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks,
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sctp_auth_chklist_t * list);
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/* key handling */
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extern sctp_key_t *sctp_alloc_key(uint32_t keylen);
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extern void sctp_free_key(sctp_key_t * key);
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extern void sctp_print_key(sctp_key_t * key, const char *str);
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extern void sctp_show_key(sctp_key_t * key, const char *str);
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extern sctp_key_t *sctp_generate_random_key(uint32_t keylen);
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extern sctp_key_t *sctp_set_key(uint8_t * key, uint32_t keylen);
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extern sctp_key_t *
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sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2,
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sctp_key_t * shared);
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/* shared key handling */
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extern sctp_sharedkey_t *sctp_alloc_sharedkey(void);
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extern void sctp_free_sharedkey(sctp_sharedkey_t * skey);
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extern sctp_sharedkey_t *
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sctp_find_sharedkey(struct sctp_keyhead *shared_keys,
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uint16_t key_id);
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extern int
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sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
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sctp_sharedkey_t * new_skey);
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extern int
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sctp_copy_skeylist(const struct sctp_keyhead *src,
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struct sctp_keyhead *dest);
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/* ref counts on shared keys, by key id */
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extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid);
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extern void
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sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid,
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int so_locked);
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/* hmac list handling */
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extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint8_t num_hmacs);
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extern void sctp_free_hmaclist(sctp_hmaclist_t * list);
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extern int sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id);
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extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t * list);
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extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void);
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extern uint16_t
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sctp_negotiate_hmacid(sctp_hmaclist_t * peer,
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sctp_hmaclist_t * local);
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extern int sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr);
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extern int
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sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs,
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uint32_t num_hmacs);
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extern sctp_authinfo_t *sctp_alloc_authinfo(void);
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extern void sctp_free_authinfo(sctp_authinfo_t * authinfo);
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/* keyed-HMAC functions */
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extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo);
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extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo);
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extern uint32_t
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sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
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uint8_t * text, uint32_t textlen, uint8_t * digest);
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extern int
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sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
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uint8_t * text, uint32_t textlen, uint8_t * digest, uint32_t digestlen);
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extern uint32_t
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sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key,
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uint8_t * text, uint32_t textlen, uint8_t * digest);
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extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id);
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/* mbuf versions */
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extern uint32_t
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sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
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struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer);
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extern uint32_t
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sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key,
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struct mbuf *m, uint32_t m_offset, uint8_t * digest);
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/*
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* authentication routines
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*/
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extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid);
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extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid);
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extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
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extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
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extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid);
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extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid);
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extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
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extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
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extern void
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sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
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uint32_t offset, uint32_t length);
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extern void
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sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
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struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id);
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extern struct mbuf *
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sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
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struct sctp_auth_chunk **auth_ret, uint32_t * offset,
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struct sctp_tcb *stcb, uint8_t chunk);
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extern int
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sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch,
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struct mbuf *m, uint32_t offset);
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extern void
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sctp_notify_authentication(struct sctp_tcb *stcb,
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uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked);
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extern int
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sctp_validate_init_auth_params(struct mbuf *m, int offset,
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int limit);
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extern void
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sctp_initialize_auth_params(struct sctp_inpcb *inp,
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struct sctp_tcb *stcb);
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/* test functions */
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#endif /* __SCTP_AUTH_H__ */
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