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freebsd-skq/sys/netinet/sctp_auth.h
rrs 0f2b9dafa3 Code from the hack-session known as the IETF (and a 
bit of debugging afterwards):
- Fix protection code for notification generation.
- Decouple associd from vtag
- Allow vtags to have less strigent requirements in non-uniqueness.
   o don't pre-hash them when you issue one in a cookie.
   o Allow duplicates and use addresses and ports to
     discriminate amongst the duplicates during lookup.
- Add support for the NAT draft draft-ietf-behave-sctpnat-00, this
  is still experimental and needs more extensive testing with the
  Jason Butt ipfw changes.
- Support for the SENDER_DRY event to get DTLS in OpenSSL working
  with a set of patches from Michael Tuexen (hopefully heading to OpenSSL soon).
- Update the support of SCTP-AUTH by Peter Lei.
- Use macros for refcounting.
- Fix MTU for UDP encapsulation.
- Fix reporting back of unsent data.
- Update assoc send counter handling to be consistent with endpoint sent counter.
- Fix a bug in PR-SCTP.
- Fix so we only send another FWD-TSN when a SACK arrives IF and only
  if the adv-peer-ack point progressed. However we still make sure
  a timer is running if we do have an adv_peer_ack point.
- Fix PR-SCTP bug where chunks were retransmitted if they are sent
  unreliable but not abandoned yet.

With the help of:	Michael Teuxen and Peter Lei :-)
MFC after:	 4 weeks
2008-12-06 13:19:54 +00:00

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/*-
* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* a) Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* b) Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* c) Neither the name of Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef __SCTP_AUTH_H__
#define __SCTP_AUTH_H__
/* digest lengths */
#define SCTP_AUTH_DIGEST_LEN_SHA1 20
#define SCTP_AUTH_DIGEST_LEN_MD5 16
#define SCTP_AUTH_DIGEST_LEN_SHA224 28
#define SCTP_AUTH_DIGEST_LEN_SHA256 32
#define SCTP_AUTH_DIGEST_LEN_SHA384 48
#define SCTP_AUTH_DIGEST_LEN_SHA512 64
#define SCTP_AUTH_DIGEST_LEN_MAX 64
/* random sizes */
#define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32
#define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32
#define SCTP_AUTH_RANDOM_SIZE_MAX 256
/* union of all supported HMAC algorithm contexts */
typedef union sctp_hash_context {
SHA1_CTX sha1;
MD5_CTX md5;
#ifdef HAVE_SHA2
SHA256_CTX sha256;
SHA384_CTX sha384;
SHA512_CTX sha512;
#endif
} sctp_hash_context_t;
typedef struct sctp_key {
uint32_t keylen;
uint8_t key[0];
} sctp_key_t;
typedef struct sctp_shared_key {
LIST_ENTRY(sctp_shared_key) next;
sctp_key_t *key; /* key text */
uint32_t refcount; /* reference count */
uint16_t keyid; /* shared key ID */
uint8_t deactivated; /* key is deactivated */
} sctp_sharedkey_t;
LIST_HEAD(sctp_keyhead, sctp_shared_key);
/* authentication chunks list */
typedef struct sctp_auth_chklist {
uint8_t chunks[256];
uint8_t num_chunks;
} sctp_auth_chklist_t;
/* hmac algos supported list */
typedef struct sctp_hmaclist {
uint16_t max_algo; /* max algorithms allocated */
uint16_t num_algo; /* num algorithms used */
uint16_t hmac[0];
} sctp_hmaclist_t;
/* authentication info */
typedef struct sctp_authinfo {
sctp_key_t *random; /* local random key (concatenated) */
uint32_t random_len; /* local random number length for param */
sctp_key_t *peer_random;/* peer's random key (concatenated) */
sctp_key_t *assoc_key; /* cached concatenated send key */
sctp_key_t *recv_key; /* cached concatenated recv key */
uint16_t active_keyid; /* active send keyid */
uint16_t assoc_keyid; /* current send keyid (cached) */
uint16_t recv_keyid; /* last recv keyid (cached) */
} sctp_authinfo_t;
/*
* Macros
*/
#define sctp_auth_is_required_chunk(chunk, list) ((list == NULL) ? (0) : (list->chunks[chunk] != 0))
/*
* function prototypes
*/
/* socket option api functions */
extern sctp_auth_chklist_t *sctp_alloc_chunklist(void);
extern void sctp_free_chunklist(sctp_auth_chklist_t * chklist);
extern void sctp_clear_chunklist(sctp_auth_chklist_t * chklist);
extern sctp_auth_chklist_t *sctp_copy_chunklist(sctp_auth_chklist_t * chklist);
extern int sctp_auth_add_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
extern int sctp_auth_delete_chunk(uint8_t chunk, sctp_auth_chklist_t * list);
extern size_t sctp_auth_get_chklist_size(const sctp_auth_chklist_t * list);
extern void sctp_auth_set_default_chunks(sctp_auth_chklist_t * list);
extern int
sctp_serialize_auth_chunks(const sctp_auth_chklist_t * list,
uint8_t * ptr);
extern int
sctp_pack_auth_chunks(const sctp_auth_chklist_t * list,
uint8_t * ptr);
extern int
sctp_unpack_auth_chunks(const uint8_t * ptr, uint8_t num_chunks,
sctp_auth_chklist_t * list);
/* key handling */
extern sctp_key_t *sctp_alloc_key(uint32_t keylen);
extern void sctp_free_key(sctp_key_t * key);
extern void sctp_print_key(sctp_key_t * key, const char *str);
extern void sctp_show_key(sctp_key_t * key, const char *str);
extern sctp_key_t *sctp_generate_random_key(uint32_t keylen);
extern sctp_key_t *sctp_set_key(uint8_t * key, uint32_t keylen);
extern sctp_key_t *
sctp_compute_hashkey(sctp_key_t * key1, sctp_key_t * key2,
sctp_key_t * shared);
/* shared key handling */
extern sctp_sharedkey_t *sctp_alloc_sharedkey(void);
extern void sctp_free_sharedkey(sctp_sharedkey_t * skey);
extern sctp_sharedkey_t *
sctp_find_sharedkey(struct sctp_keyhead *shared_keys,
uint16_t key_id);
extern int
sctp_insert_sharedkey(struct sctp_keyhead *shared_keys,
sctp_sharedkey_t * new_skey);
extern int
sctp_copy_skeylist(const struct sctp_keyhead *src,
struct sctp_keyhead *dest);
/* ref counts on shared keys, by key id */
extern void sctp_auth_key_acquire(struct sctp_tcb *stcb, uint16_t keyid);
extern void sctp_auth_key_release(struct sctp_tcb *stcb, uint16_t keyid);
/* hmac list handling */
extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint8_t num_hmacs);
extern void sctp_free_hmaclist(sctp_hmaclist_t * list);
extern int sctp_auth_add_hmacid(sctp_hmaclist_t * list, uint16_t hmac_id);
extern sctp_hmaclist_t *sctp_copy_hmaclist(sctp_hmaclist_t * list);
extern sctp_hmaclist_t *sctp_default_supported_hmaclist(void);
extern uint16_t
sctp_negotiate_hmacid(sctp_hmaclist_t * peer,
sctp_hmaclist_t * local);
extern int sctp_serialize_hmaclist(sctp_hmaclist_t * list, uint8_t * ptr);
extern int
sctp_verify_hmac_param(struct sctp_auth_hmac_algo *hmacs,
uint32_t num_hmacs);
extern sctp_authinfo_t *sctp_alloc_authinfo(void);
extern void sctp_free_authinfo(sctp_authinfo_t * authinfo);
/* keyed-HMAC functions */
extern uint32_t sctp_get_auth_chunk_len(uint16_t hmac_algo);
extern uint32_t sctp_get_hmac_digest_len(uint16_t hmac_algo);
extern uint32_t
sctp_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
uint8_t * text, uint32_t textlen, uint8_t * digest);
extern int
sctp_verify_hmac(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
uint8_t * text, uint32_t textlen, uint8_t * digest, uint32_t digestlen);
extern uint32_t
sctp_compute_hmac(uint16_t hmac_algo, sctp_key_t * key,
uint8_t * text, uint32_t textlen, uint8_t * digest);
extern int sctp_auth_is_supported_hmac(sctp_hmaclist_t * list, uint16_t id);
/* mbuf versions */
extern uint32_t
sctp_hmac_m(uint16_t hmac_algo, uint8_t * key, uint32_t keylen,
struct mbuf *m, uint32_t m_offset, uint8_t * digest, uint32_t trailer);
extern uint32_t
sctp_compute_hmac_m(uint16_t hmac_algo, sctp_key_t * key,
struct mbuf *m, uint32_t m_offset, uint8_t * digest);
/*
* authentication routines
*/
extern void sctp_clear_cachedkeys(struct sctp_tcb *stcb, uint16_t keyid);
extern void sctp_clear_cachedkeys_ep(struct sctp_inpcb *inp, uint16_t keyid);
extern int sctp_delete_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
extern int sctp_delete_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
extern int sctp_auth_setactivekey(struct sctp_tcb *stcb, uint16_t keyid);
extern int sctp_auth_setactivekey_ep(struct sctp_inpcb *inp, uint16_t keyid);
extern int sctp_deact_sharedkey(struct sctp_tcb *stcb, uint16_t keyid);
extern int sctp_deact_sharedkey_ep(struct sctp_inpcb *inp, uint16_t keyid);
extern void
sctp_auth_get_cookie_params(struct sctp_tcb *stcb, struct mbuf *m,
uint32_t offset, uint32_t length);
extern void
sctp_fill_hmac_digest_m(struct mbuf *m, uint32_t auth_offset,
struct sctp_auth_chunk *auth, struct sctp_tcb *stcb, uint16_t key_id);
extern struct mbuf *
sctp_add_auth_chunk(struct mbuf *m, struct mbuf **m_end,
struct sctp_auth_chunk **auth_ret, uint32_t * offset,
struct sctp_tcb *stcb, uint8_t chunk);
extern int
sctp_handle_auth(struct sctp_tcb *stcb, struct sctp_auth_chunk *ch,
struct mbuf *m, uint32_t offset);
extern void
sctp_notify_authentication(struct sctp_tcb *stcb,
uint32_t indication, uint16_t keyid, uint16_t alt_keyid, int so_locked);
extern int
sctp_validate_init_auth_params(struct mbuf *m, int offset,
int limit);
extern void
sctp_initialize_auth_params(struct sctp_inpcb *inp,
struct sctp_tcb *stcb);
/* test functions */
extern void sctp_test_hmac_sha1(void);
extern void sctp_test_hmac_md5(void);
extern void sctp_test_authkey(void);
#endif /* __SCTP_AUTH_H__ */
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