cregit-Linux how code gets into the kernel

Release 4.8 net/sctp/auth.c

Directory: net/sctp
/* SCTP kernel implementation
 * (C) Copyright 2007 Hewlett-Packard Development Company, L.P.
 *
 * This file is part of the SCTP kernel implementation
 *
 * This SCTP implementation is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This SCTP implementation is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *   Vlad Yasevich     <vladislav.yasevich@hp.com>
 */

#include <crypto/hash.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <net/sctp/sctp.h>
#include <net/sctp/auth.h>


static struct sctp_hmac sctp_hmac_list[SCTP_AUTH_NUM_HMACS] = {
	{
		/* id 0 is reserved.  as all 0 */
		.hmac_id = SCTP_AUTH_HMAC_ID_RESERVED_0,
        },
	{
		.hmac_id = SCTP_AUTH_HMAC_ID_SHA1,
		.hmac_name = "hmac(sha1)",
		.hmac_len = SCTP_SHA1_SIG_SIZE,
        },
	{
		/* id 2 is reserved as well */
		.hmac_id = SCTP_AUTH_HMAC_ID_RESERVED_2,
        },
#if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
	{
		.hmac_id = SCTP_AUTH_HMAC_ID_SHA256,
		.hmac_name = "hmac(sha256)",
		.hmac_len = SCTP_SHA256_SIG_SIZE,
        }
#endif
};



void sctp_auth_key_put(struct sctp_auth_bytes *key) { if (!key) return; if (atomic_dec_and_test(&key->refcnt)) { kzfree(key); SCTP_DBG_OBJCNT_DEC(keys); } }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich3797.37%150.00%
daniel borkmanndaniel borkmann12.63%150.00%
Total38100.00%2100.00%

/* Create a new key structure of a given length */
static struct sctp_auth_bytes *sctp_auth_create_key(__u32 key_len, gfp_t gfp) { struct sctp_auth_bytes *key; /* Verify that we are not going to overflow INT_MAX */ if (key_len > (INT_MAX - sizeof(struct sctp_auth_bytes))) return NULL; /* Allocate the shared key */ key = kmalloc(sizeof(struct sctp_auth_bytes) + key_len, gfp); if (!key) return NULL; key->len = key_len; atomic_set(&key->refcnt, 1); SCTP_DBG_OBJCNT_INC(keys); return key; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich8296.47%266.67%
xi wangxi wang33.53%133.33%
Total85100.00%3100.00%

/* Create a new shared key container with a give key id */
struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp) { struct sctp_shared_key *new; /* Allocate the shared key container */ new = kzalloc(sizeof(struct sctp_shared_key), gfp); if (!new) return NULL; INIT_LIST_HEAD(&new->key_list); new->key_id = key_id; return new; }

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vladislav yasevichvladislav yasevich57100.00%1100.00%
Total57100.00%1100.00%

/* Free the shared key structure */
static void sctp_auth_shkey_free(struct sctp_shared_key *sh_key) { BUG_ON(!list_empty(&sh_key->key_list)); sctp_auth_key_put(sh_key->key); sh_key->key = NULL; kfree(sh_key); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich4097.56%150.00%
adrian bunkadrian bunk12.44%150.00%
Total41100.00%2100.00%

/* Destroy the entire key list. This is done during the * associon and endpoint free process. */
void sctp_auth_destroy_keys(struct list_head *keys) { struct sctp_shared_key *ep_key; struct sctp_shared_key *tmp; if (list_empty(keys)) return; key_for_each_safe(ep_key, tmp, keys) { list_del_init(&ep_key->key_list); sctp_auth_shkey_free(ep_key); } }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich51100.00%1100.00%
Total51100.00%1100.00%

/* Compare two byte vectors as numbers. Return values * are: * 0 - vectors are equal * < 0 - vector 1 is smaller than vector2 * > 0 - vector 1 is greater than vector2 * * Algorithm is: * This is performed by selecting the numerically smaller key vector... * If the key vectors are equal as numbers but differ in length ... * the shorter vector is considered smaller * * Examples (with small values): * 000123456789 > 123456789 (first number is longer) * 000123456789 < 234567891 (second number is larger numerically) * 123456789 > 2345678 (first number is both larger & longer) */
static int sctp_auth_compare_vectors(struct sctp_auth_bytes *vector1, struct sctp_auth_bytes *vector2) { int diff; int i; const __u8 *longer; diff = vector1->len - vector2->len; if (diff) { longer = (diff > 0) ? vector1->data : vector2->data; /* Check to see if the longer number is * lead-zero padded. If it is not, it * is automatically larger numerically. */ for (i = 0; i < abs(diff); i++) { if (longer[i] != 0) return diff; } } /* lengths are the same, compare numbers */ return memcmp(vector1->data, vector2->data, vector1->len); }

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PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich107100.00%1100.00%
Total107100.00%1100.00%

/* * Create a key vector as described in SCTP-AUTH, Section 6.1 * The RANDOM parameter, the CHUNKS parameter and the HMAC-ALGO * parameter sent by each endpoint are concatenated as byte vectors. * These parameters include the parameter type, parameter length, and * the parameter value, but padding is omitted; all padding MUST be * removed from this concatenation before proceeding with further * computation of keys. Parameters which were not sent are simply * omitted from the concatenation process. The resulting two vectors * are called the two key vectors. */
static struct sctp_auth_bytes *sctp_auth_make_key_vector( sctp_random_param_t *random, sctp_chunks_param_t *chunks, sctp_hmac_algo_param_t *hmacs, gfp_t gfp) { struct sctp_auth_bytes *new; __u32 len; __u32 offset = 0; __u16 random_len, hmacs_len, chunks_len = 0; random_len = ntohs(random->param_hdr.length); hmacs_len = ntohs(hmacs->param_hdr.length); if (chunks) chunks_len = ntohs(chunks->param_hdr.length); len = random_len + hmacs_len + chunks_len; new = sctp_auth_create_key(len, gfp); if (!new) return NULL; memcpy(new->data, random, random_len); offset += random_len; if (chunks) { memcpy(new->data + offset, chunks, chunks_len); offset += chunks_len; } memcpy(new->data + offset, hmacs, hmacs_len); return new; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich13281.99%133.33%
daniel borkmanndaniel borkmann2918.01%266.67%
Total161100.00%3100.00%

/* Make a key vector based on our local parameters */
static struct sctp_auth_bytes *sctp_auth_make_local_vector( const struct sctp_association *asoc, gfp_t gfp) { return sctp_auth_make_key_vector( (sctp_random_param_t *)asoc->c.auth_random, (sctp_chunks_param_t *)asoc->c.auth_chunks, (sctp_hmac_algo_param_t *)asoc->c.auth_hmacs, gfp); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich5298.11%150.00%
adrian bunkadrian bunk11.89%150.00%
Total53100.00%2100.00%

/* Make a key vector based on peer's parameters */
static struct sctp_auth_bytes *sctp_auth_make_peer_vector( const struct sctp_association *asoc, gfp_t gfp) { return sctp_auth_make_key_vector(asoc->peer.peer_random, asoc->peer.peer_chunks, asoc->peer.peer_hmacs, gfp); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich4097.56%150.00%
adrian bunkadrian bunk12.44%150.00%
Total41100.00%2100.00%

/* Set the value of the association shared key base on the parameters * given. The algorithm is: * From the endpoint pair shared keys and the key vectors the * association shared keys are computed. This is performed by selecting * the numerically smaller key vector and concatenating it to the * endpoint pair shared key, and then concatenating the numerically * larger key vector to that. The result of the concatenation is the * association shared key. */
static struct sctp_auth_bytes *sctp_auth_asoc_set_secret( struct sctp_shared_key *ep_key, struct sctp_auth_bytes *first_vector, struct sctp_auth_bytes *last_vector, gfp_t gfp) { struct sctp_auth_bytes *secret; __u32 offset = 0; __u32 auth_len; auth_len = first_vector->len + last_vector->len; if (ep_key->key) auth_len += ep_key->key->len; secret = sctp_auth_create_key(auth_len, gfp); if (!secret) return NULL; if (ep_key->key) { memcpy(secret->data, ep_key->key->data, ep_key->key->len); offset += ep_key->key->len; } memcpy(secret->data + offset, first_vector->data, first_vector->len); offset += first_vector->len; memcpy(secret->data + offset, last_vector->data, last_vector->len); return secret; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich158100.00%1100.00%
Total158100.00%1100.00%

/* Create an association shared key. Follow the algorithm * described in SCTP-AUTH, Section 6.1 */
static struct sctp_auth_bytes *sctp_auth_asoc_create_secret( const struct sctp_association *asoc, struct sctp_shared_key *ep_key, gfp_t gfp) { struct sctp_auth_bytes *local_key_vector; struct sctp_auth_bytes *peer_key_vector; struct sctp_auth_bytes *first_vector, *last_vector; struct sctp_auth_bytes *secret = NULL; int cmp; /* Now we need to build the key vectors * SCTP-AUTH , Section 6.1 * The RANDOM parameter, the CHUNKS parameter and the HMAC-ALGO * parameter sent by each endpoint are concatenated as byte vectors. * These parameters include the parameter type, parameter length, and * the parameter value, but padding is omitted; all padding MUST be * removed from this concatenation before proceeding with further * computation of keys. Parameters which were not sent are simply * omitted from the concatenation process. The resulting two vectors * are called the two key vectors. */ local_key_vector = sctp_auth_make_local_vector(asoc, gfp); peer_key_vector = sctp_auth_make_peer_vector(asoc, gfp); if (!peer_key_vector || !local_key_vector) goto out; /* Figure out the order in which the key_vectors will be * added to the endpoint shared key. * SCTP-AUTH, Section 6.1: * This is performed by selecting the numerically smaller key * vector and concatenating it to the endpoint pair shared * key, and then concatenating the numerically larger key * vector to that. If the key vectors are equal as numbers * but differ in length, then the concatenation order is the * endpoint shared key, followed by the shorter key vector, * followed by the longer key vector. Otherwise, the key * vectors are identical, and may be concatenated to the * endpoint pair key in any order. */ cmp = sctp_auth_compare_vectors(local_key_vector, peer_key_vector); if (cmp < 0) { first_vector = local_key_vector; last_vector = peer_key_vector; } else { first_vector = peer_key_vector; last_vector = local_key_vector; } secret = sctp_auth_asoc_set_secret(ep_key, first_vector, last_vector, gfp); out: sctp_auth_key_put(local_key_vector); sctp_auth_key_put(peer_key_vector); return secret; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich14297.93%133.33%
daniel borkmanndaniel borkmann21.38%133.33%
lucas de marchilucas de marchi10.69%133.33%
Total145100.00%3100.00%

/* * Populate the association overlay list with the list * from the endpoint. */
int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep, struct sctp_association *asoc, gfp_t gfp) { struct sctp_shared_key *sh_key; struct sctp_shared_key *new; BUG_ON(!list_empty(&asoc->endpoint_shared_keys)); key_for_each(sh_key, &ep->endpoint_shared_keys) { new = sctp_auth_shkey_create(sh_key->key_id, gfp); if (!new) goto nomem; new->key = sh_key->key; sctp_auth_key_hold(new->key); list_add(&new->key_list, &asoc->endpoint_shared_keys); } return 0; nomem: sctp_auth_destroy_keys(&asoc->endpoint_shared_keys); return -ENOMEM; }

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PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich113100.00%1100.00%
Total113100.00%1100.00%

/* Public interface to create the association shared key. * See code above for the algorithm. */
int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp) { struct sctp_auth_bytes *secret; struct sctp_shared_key *ep_key; struct sctp_chunk *chunk; /* If we don't support AUTH, or peer is not capable * we don't need to do anything. */ if (!asoc->ep->auth_enable || !asoc->peer.auth_capable) return 0; /* If the key_id is non-zero and we couldn't find an * endpoint pair shared key, we can't compute the * secret. * For key_id 0, endpoint pair shared key is a NULL key. */ ep_key = sctp_auth_get_shkey(asoc, asoc->active_key_id); BUG_ON(!ep_key); secret = sctp_auth_asoc_create_secret(asoc, ep_key, gfp); if (!secret) return -ENOMEM; sctp_auth_key_put(asoc->asoc_shared_key); asoc->asoc_shared_key = secret; /* Update send queue in case any chunk already in there now * needs authenticating */ list_for_each_entry(chunk, &asoc->outqueue.out_chunk_list, list) { if (sctp_auth_send_cid(chunk->chunk_hdr->type, asoc)) chunk->auth = 1; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich9269.70%125.00%
marcelo ricardo leitnermarcelo ricardo leitner3526.52%125.00%
vlad yasevichvlad yasevich32.27%125.00%
eric w. biedermaneric w. biederman21.52%125.00%
Total132100.00%4100.00%

/* Find the endpoint pair shared key based on the key_id */
struct sctp_shared_key *sctp_auth_get_shkey( const struct sctp_association *asoc, __u16 key_id) { struct sctp_shared_key *key; /* First search associations set of endpoint pair shared keys */ key_for_each(key, &asoc->endpoint_shared_keys) { if (key->key_id == key_id) return key; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich4090.91%150.00%
wei yongjunwei yongjun49.09%150.00%
Total44100.00%2100.00%

/* * Initialize all the possible digest transforms that we can use. Right now * now, the supported digests are SHA1 and SHA256. We do this here once * because of the restrictiong that transforms may only be allocated in * user context. This forces us to pre-allocated all possible transforms * at the endpoint init time. */
int sctp_auth_init_hmacs(struct sctp_endpoint *ep, gfp_t gfp) { struct crypto_shash *tfm = NULL; __u16 id; /* If AUTH extension is disabled, we are done */ if (!ep->auth_enable) { ep->auth_hmacs = NULL; return 0; } /* If the transforms are already allocated, we are done */ if (ep->auth_hmacs) return 0; /* Allocated the array of pointers to transorms */ ep->auth_hmacs = kzalloc(sizeof(struct crypto_shash *) * SCTP_AUTH_NUM_HMACS, gfp); if (!ep->auth_hmacs) return -ENOMEM; for (id = 0; id < SCTP_AUTH_NUM_HMACS; id++) { /* See is we support the id. Supported IDs have name and * length fields set, so that we can allocated and use * them. We can safely just check for name, for without the * name, we can't allocate the TFM. */ if (!sctp_hmac_list[id].hmac_name) continue; /* If this TFM has been allocated, we are all set */ if (ep->auth_hmacs[id]) continue; /* Allocate the ID */ tfm = crypto_alloc_shash(sctp_hmac_list[id].hmac_name, 0, 0); if (IS_ERR(tfm)) goto out_err; ep->auth_hmacs[id] = tfm; } return 0; out_err: /* Clean up any successful allocations */ sctp_auth_destroy_hmacs(ep->auth_hmacs); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich16394.22%120.00%
herbert xuherbert xu42.31%120.00%
vlad yasevichvlad yasevich31.73%120.00%
eric w. biedermaneric w. biederman21.16%120.00%
coly licoly li10.58%120.00%
Total173100.00%5100.00%

/* Destroy the hmac tfm array */
void sctp_auth_destroy_hmacs(struct crypto_shash *auth_hmacs[]) { int i; if (!auth_hmacs) return; for (i = 0; i < SCTP_AUTH_NUM_HMACS; i++) { crypto_free_shash(auth_hmacs[i]); } kfree(auth_hmacs); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich4695.83%150.00%
herbert xuherbert xu24.17%150.00%
Total48100.00%2100.00%


struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id) { return &sctp_hmac_list[hmac_id]; }

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vladislav yasevichvladislav yasevich17100.00%1100.00%
Total17100.00%1100.00%

/* Get an hmac description information that we can use to build * the AUTH chunk */
struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc) { struct sctp_hmac_algo_param *hmacs; __u16 n_elt; __u16 id = 0; int i; /* If we have a default entry, use it */ if (asoc->default_hmac_id) return &sctp_hmac_list[asoc->default_hmac_id]; /* Since we do not have a default entry, find the first entry * we support and return that. Do not cache that id. */ hmacs = asoc->peer.peer_hmacs; if (!hmacs) return NULL; n_elt = (ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t)) >> 1; for (i = 0; i < n_elt; i++) { id = ntohs(hmacs->hmac_ids[i]); /* Check the id is in the supported range. And * see if we support the id. Supported IDs have name and * length fields set, so that we can allocate and use * them. We can safely just check for name, for without the * name, we can't allocate the TFM. */ if (id > SCTP_AUTH_HMAC_ID_MAX || !sctp_hmac_list[id].hmac_name) { id = 0; continue; } break; } if (id == 0) return NULL; return &sctp_hmac_list[id]; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich14094.59%133.33%
dan rosenbergdan rosenberg64.05%133.33%
wang weidongwang weidong21.35%133.33%
Total148100.00%3100.00%


static int __sctp_auth_find_hmacid(__be16 *hmacs, int n_elts, __be16 hmac_id) { int found = 0; int i; for (i = 0; i < n_elts; i++) { if (hmac_id == hmacs[i]) { found = 1; break; } } return found; }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich5696.55%150.00%
al viroal viro23.45%150.00%
Total58100.00%2100.00%

/* See if the HMAC_ID is one that we claim as supported */
int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc, __be16 hmac_id) { struct sctp_hmac_algo_param *hmacs; __u16 n_elt; if (!asoc) return 0; hmacs = (struct sctp_hmac_algo_param *)asoc->c.auth_hmacs; n_elt = (ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t)) >> 1; return __sctp_auth_find_hmacid(hmacs->hmac_ids, n_elt, hmac_id); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich7498.67%150.00%
al viroal viro11.33%150.00%
Total75100.00%2100.00%

/* Cache the default HMAC id. This to follow this text from SCTP-AUTH: * Section 6.1: * The receiver of a HMAC-ALGO parameter SHOULD use the first listed * algorithm it supports. */
void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc, struct sctp_hmac_algo_param *hmacs) { struct sctp_endpoint *ep; __u16 id; int i; int n_params; /* if the default id is already set, use it */ if (asoc->default_hmac_id) return; n_params = (ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t)) >> 1; ep = asoc->ep; for (i = 0; i < n_params; i++) { id = ntohs(hmacs->hmac_ids[i]); /* Check the id is in the supported range */ if (id > SCTP_AUTH_HMAC_ID_MAX) continue; /* If this TFM has been allocated, use this id */ if (ep->auth_hmacs[id]) { asoc->default_hmac_id = id; break; } } }

Contributors

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vladislav yasevichvladislav yasevich117100.00%1100.00%
Total117100.00%1100.00%

/* Check to see if the given chunk is supposed to be authenticated */
static int __sctp_auth_cid(sctp_cid_t chunk, struct sctp_chunks_param *param) { unsigned short len; int found = 0; int i; if (!param || param->param_hdr.length == 0) return 0; len = ntohs(param->param_hdr.length) - sizeof(sctp_paramhdr_t); /* SCTP-AUTH, Section 3.2 * The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH * chunks MUST NOT be listed in the CHUNKS parameter. However, if * a CHUNKS parameter is received then the types for INIT, INIT-ACK, * SHUTDOWN-COMPLETE and AUTH chunks MUST be ignored. */ for (i = 0; !found && i < len; i++) { switch (param->chunks[i]) { case SCTP_CID_INIT: case SCTP_CID_INIT_ACK: case SCTP_CID_SHUTDOWN_COMPLETE: case SCTP_CID_AUTH: break; default: if (param->chunks[i] == chunk) found = 1; break; } } return found; }

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vladislav yasevichvladislav yasevich121100.00%2100.00%
Total121100.00%2100.00%

/* Check if peer requested that this chunk is authenticated */
int sctp_auth_send_cid(sctp_cid_t chunk, const struct sctp_association *asoc) { if (!asoc) return 0; if (!asoc->ep->auth_enable || !asoc->peer.auth_capable) return 0; return __sctp_auth_cid(chunk, asoc->peer.peer_chunks); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich4177.36%133.33%
eric w. biedermaneric w. biederman916.98%133.33%
vlad yasevichvlad yasevich35.66%133.33%
Total53100.00%3100.00%

/* Check if we requested that peer authenticate this chunk. */
int sctp_auth_recv_cid(sctp_cid_t chunk, const struct sctp_association *asoc) { if (!asoc) return 0; if (!asoc->ep->auth_enable) return 0; return __sctp_auth_cid(chunk, (struct sctp_chunks_param *)asoc->c.auth_chunks); }

Contributors

PersonTokensPropCommitsCommitProp
vladislav yasevichvladislav yasevich3976.47%133.33%
eric w. biedermaneric w. biederman917.65%133.33%
vlad yasevichvlad yasevich35.88%133.33%
Total51100.00%3100.00%

/* SCTP-AUTH: Section 6.2: * The sender MUST calculate the MAC as described in RFC2104 [2] using * the hash function H as described by the MAC Identifier and the shared * association key K based on the endpoint pair shared key described by * the shared key identifier. The 'data' used for the computation of * the AUTH-chunk is given by the AUTH chunk with its HMAC field set to * zero (as shown in Figure 6) followed by all chunks that are placed * after the AUTH chunk in the SCTP packet. */
void sctp_auth_calculate_hmac(const struct sctp_association *asoc, struct sk_buff *skb, struct sctp_auth_chunk *auth, gfp_t gfp) { struct crypto_shash *tfm; struct sctp_auth_bytes *asoc_key; __u16 key_id, hmac_id; __u8 *digest; unsigned char *end; int free_key = 0; /* Extract the info we need: * - hmac id * - key id */ key_id = ntohs(auth->auth_hdr.shkey_id); hmac_id = ntohs(auth->auth_hdr.hmac_id); if (key_id == asoc->active_key_id) asoc_key = asoc->asoc_shared_key; else { struct sctp_shared_key *ep_key; ep_key = sctp_auth_get_shkey(asoc, key_id); if (!ep_key) return; asoc_key = sctp_auth_asoc_create_secret(asoc, ep_key, gfp); if (!asoc_key) return; free_key = 1; } /* set up scatter list */ end = skb_tail_pointer(skb); tfm = asoc->ep->auth_hmacs[hmac_id]; digest = auth->auth_hdr.hmac; if (crypto_shash_setkey(tfm, &asoc_key->data[0], asoc_key->len)) goto free; { SHASH_DESC_ON_STACK(desc, tfm); desc->tfm = tfm; desc->flags = 0; crypto_shash_digest(desc, (u8 *)auth, end - (unsigned char *)auth, digest); shash_desc_zero(desc); } free: if (free_key) sctp_auth_key_put(asoc_key); }

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vladislav yasevichvladislav yasevich19881.82%150.00%
herbert xuherbert xu4418.18%150.00%
Total242100.00%2100.00%

/* API Helpers */ /* Add a chunk to the endpoint authenticated chunk list */
int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id) { struct sctp_chunks_param *p = ep->auth_chunk_list; __u16 nchunks; __u16 param_len; /* If this chunk is already specified, we are done */ if (__sctp_auth_cid(chunk_id, p)) return 0; /* Check if we can add this chunk to the array */ param_len = ntohs(p->param_hdr.length); nchunks = param_len - sizeof(sctp_paramhdr_t); if (nchunks == SCTP_NUM_CHUNK_TYPES) return -EINVAL; p->chunks[nchunks] = chunk_id; p->param_hdr.length = htons(param_len + 1); return 0; }

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vladislav yasevichvladislav yasevich97100.00%1100.00%
Total97100.00%1100.00%

/* Add hmac identifires to the endpoint list of supported hmac ids */
int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep, struct sctp_hmacalgo *hmacs) { int has_sha1 = 0; __u16 id; int i; /* Scan the list looking for unsupported id. Also make sure that * SHA1 is specified. */ for (i = 0; i < hmacs->shmac_num_idents; i++) { id = hmacs->shmac_idents[i]; if (id > SCTP_AUTH_HMAC_ID_MAX) return -EOPNOTSUPP; if (SCTP_AUTH_HMAC_ID_SHA1 == id) has_sha1 = 1; if (!sctp_hmac_list[id].hmac_name) return -EOPNOTSUPP; } if (!has_sha1) return -EINVAL; for (i = 0; i < hmacs->shmac_num_idents; i++) ep->auth_hmacs_list->hmac_ids[i] = htons(hmacs->shmac_idents[i]); ep->auth_hmacs_list->param_hdr.length = htons(sizeof(sctp_paramhdr_t) + hmacs->shmac_num_idents * sizeof(__u16)); return 0; }

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vladislav yasevichvladislav yasevich13686.08%266.67%
lucien xinlucien xin2213.92%133.33%
Total158100.00%3100.00%

/* Set a new shared key on either endpoint or association. If the * the key with a same ID already exists, replace the key (remove the * old key and add a new one). */
int sctp_auth_set_key(struct sctp_endpoint *ep, struct sctp_association *asoc, struct sctp_authkey *auth_key) { struct sctp_shared_key *cur_key = NULL; struct sctp_auth_bytes *key; struct list_head *sh_keys; int replace = 0; /* Try to find the given key id to see if * we are doing a replace, or adding a new key */ if (asoc) sh_keys = &asoc->endpoint_shared_keys; else sh_keys = &ep->endpoint_shared_keys; key_for_each(cur_key, sh_keys) { if (cur_key->key_id == auth_key->sca_keynumber) { replace = 1; break; } } /* If we are not replacing a key id, we need to allocate * a shared key. */ if (!replace) { cur_key = sctp_auth_shkey_create(auth_key->sca_keynumber, GFP_KERNEL); if (!cur_key) return -ENOMEM; } /* Create a new key data based on the info passed in */ key = sctp_auth_create_key(auth_key->sca_keylength, GFP_KERNEL); if (!key) goto nomem; memcpy(key->data, &auth_key->sca_key[0], auth_key->sca_keylength); /* If we are replacing, remove the old keys data from the * key id. If we are adding new key id, add it to the * list. */ if (replace) sctp_auth_key_put(cur_key->key); else list_add(&cur_key->key_list, sh_keys); cur_key->key = key; return 0; nomem: if (!replace) sctp_auth_shkey_free(cur_key); return -ENOMEM; }

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vladislav yasevichvladislav yasevich202100.00%2100.00%