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gstreamer/ext/sctp/usrsctp/usrsctplib/netinet/sctp_auth.h
Tim-Philipp Müller f4538e24b6 sctp: import internal copy of usrsctp library 
There are problems with global shared state and no API stability
guarantees, and we can't rely on distros shipping the fixes we
need. Both firefox and Chrome bundle their own copies too.

Imported from https://github.com/sctplab/usrsctp,
commit 547d3b46c64876c0336b9eef297fda58dbe1adaf
Date: Thu Jul 23 21:49:32 2020 +0200

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/870

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1465>
2020-08-14 01:32:45 +01:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
* Copyright (c) 2008-2012, by Michael Tuexen. 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.
*/
#if defined(__FreeBSD__) && !defined(__Userspace__)
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/netinet/sctp_auth.h 338749 2018-09-18 10:53:07Z tuexen $");
#endif
#ifndef _NETINET_SCTP_AUTH_H_
#define _NETINET_SCTP_AUTH_H_
#include <netinet/sctp_os.h>
/* digest lengths */
#define SCTP_AUTH_DIGEST_LEN_SHA1 20
#define SCTP_AUTH_DIGEST_LEN_SHA256 32
#define SCTP_AUTH_DIGEST_LEN_MAX SCTP_AUTH_DIGEST_LEN_SHA256
/* random sizes */
#define SCTP_AUTH_RANDOM_SIZE_DEFAULT 32
#define SCTP_AUTH_RANDOM_SIZE_REQUIRED 32
/* union of all supported HMAC algorithm contexts */
typedef union sctp_hash_context {
SCTP_SHA1_CTX sha1;
#if defined(SCTP_SUPPORT_HMAC_SHA256)
SCTP_SHA256_CTX sha256;
#endif
} sctp_hash_context_t;
typedef struct sctp_key {
uint32_t keylen;
uint8_t key[];
} 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[];
} sctp_hmaclist_t;
/* authentication info */
typedef struct sctp_authinformation {
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 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,
int so_locked);
/* hmac list handling */
extern sctp_hmaclist_t *sctp_alloc_hmaclist(uint16_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 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 */
#ifdef SCTP_HMAC_TEST
extern void sctp_test_hmac_sha1(void);
extern void sctp_test_authkey(void);
#endif
#endif /* __SCTP_AUTH_H__ */
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