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f42a358a6f
freebsd-dev/sys/netinet/sctp_auth.h
Randall Stewart f42a358a6f - Copyright updates (aka 2007) 
- ZONE get now also take a type cast so it does the
  cast like mtod does.
- New macro SCTP_LIST_EMPTY, which in bsd is just
  LIST_EMPTY
- Removal of const in some of the static hmac functions
  (not needed)
- Store length changes to allow for new fields in auth
- Auth code updated to current draft (this should be the
  RFC version we think).
- use uint8_t instead of u_char in LOOPBACK address comparison
- Some u_int32_t converted to uint32_t (in crc code)
- A bug was found in the mib counts for ordered/unordered
  count, this was fixed (was referencing a freed mbuf).
- SCTP_ASOCLOG_OF_TSNS added (code will probably disappear
  after my testing completes. It allows us to keep a
  small log on each assoc of the last 40 TSN's in/out and
  stream assignment. It is NOT in options and so is only
  good for private builds.
- Some CMT changes in prep for Jana fixing his problem
  with reneging when CMT is enabled (Concurrent Multipath
  Transfer = CMT).
- Some missing mib stats added.
- Correction to number of open assoc's count in mib
- Correction to os_bsd.h to get right sha2 macros
- Add of special AUTH_04 flags so you can compile the code
  with the old format (in case the peer does not yet support
  the latest auth code).
- Nonce sum was incorrectly being set in when ecn_nonce was
  NOT on.
- LOR in listen with implicit bind found and fixed.
- Moved away from using mbuf's for socket options to using
  just data pointers. The mbufs were used to harmonize
  NetBSD code since both Net and Open used this method. We
  have decided to move away from that and more conform to
  FreeBSD style (which makes more sense).
- Very very nasty bug found in some of my "debug" code. The
  cookie_how collision case tracking had an endless loop in
  it if you got a second retransmission of a cookie collision
  case. This would lock up  a CPU .. ugly..
- auth function goes to using size_t instead of int which
  conforms to socketapi better
- Found the nasty bug that happens after 9 days of testing.. you
  get the data chunk, deliver it and due to the reference to a ch->
  that every now and then has been deleted (depending on the postion
  in the mbuf) you have an invalid ch->ch.flags.. and thus you don't
  advance the stream sequence number.. so you block the stream
  permanently. The fix is to make local variables of these guys
  and set them up before you have any chance of trimming the
  mbuf.
- style fix in sctp_util.h, not sure how this got bad maybe in
  the last patch? (aka it may not be in the real source).
- Found interesting bug when using the extended snd/rcv info where
  we would get an error on receiving with this. Thats because
  it was NOT padded to the same size as the snd_rcv info. We
  increase (add the pad) so the two structs are the same size
  in sctp_uio.h
- In sctp_usrreq.c one of the most common things we did for
  socket options was to cast the pointer and validate the size.
  This as been macro-ized to help make the code more readable.
- in sctputil.c two things, the socketapi class found a missing
  flag type (the next msg is a notification) and a missing
  scope recovery was also fixed.

Reviewed by:	gnn
2007-02-12 23:24:31 +00:00

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/*-
* Copyright (c) 2001-2007, 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 */
uint16_t keyid; /* shared key ID */
} 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) */
uint16_t assoc_keyid; /* current send keyid (cached) */
uint16_t recv_keyid; /* last recv keyid (cached) */
sctp_key_t *assoc_key; /* cached send key */
sctp_key_t *recv_key; /* cached recv key */
} sctp_authinfo_t;
/*
* global variables
*/
extern uint32_t sctp_asconf_auth_nochk; /* sysctl to disable ASCONF auth chk */
extern uint32_t sctp_auth_disable; /* sysctl for temp feature interop */
extern uint32_t sctp_auth_random_len; /* sysctl */
/*
* 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 void
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);
/* 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);
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 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);
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);
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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