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Merged gsoc-ssh branch. Closes #910
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evangel
414
libssh2/src/mac.c
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414
libssh2/src/mac.c
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/* Copyright (c) 2004-2007, Sara Golemon <sarag@libssh2.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* Neither the name of the copyright holder nor the names
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* of any other contributors may be used to endorse or
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* promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#include "libssh2_priv.h"
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#include "mac.h"
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#ifdef LIBSSH2_MAC_NONE
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/* mac_none_MAC
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* Minimalist MAC: No MAC
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*/
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static int
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mac_none_MAC(LIBSSH2_SESSION * session, unsigned char *buf,
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uint32_t seqno, const unsigned char *packet,
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uint32_t packet_len, const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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return 0;
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}
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static LIBSSH2_MAC_METHOD mac_method_none = {
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"none",
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0,
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0,
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NULL,
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mac_none_MAC,
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NULL
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};
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#endif /* LIBSSH2_MAC_NONE */
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/* mac_method_common_init
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* Initialize simple mac methods
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*/
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static int
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mac_method_common_init(LIBSSH2_SESSION * session, unsigned char *key,
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int *free_key, void **abstract)
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{
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*abstract = key;
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*free_key = 0;
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(void) session;
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return 0;
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}
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/* mac_method_common_dtor
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* Cleanup simple mac methods
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*/
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static int
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mac_method_common_dtor(LIBSSH2_SESSION * session, void **abstract)
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{
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if (*abstract) {
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LIBSSH2_FREE(session, *abstract);
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}
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*abstract = NULL;
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return 0;
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}
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#if LIBSSH2_HMAC_SHA512
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/* mac_method_hmac_sha512_hash
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* Calculate hash using full sha512 value
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*/
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static int
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mac_method_hmac_sha2_512_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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libssh2_hmac_ctx ctx;
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unsigned char seqno_buf[4];
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(void) session;
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_libssh2_htonu32(seqno_buf, seqno);
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libssh2_hmac_ctx_init(ctx);
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libssh2_hmac_sha512_init(&ctx, *abstract, 64);
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libssh2_hmac_update(ctx, seqno_buf, 4);
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libssh2_hmac_update(ctx, packet, packet_len);
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if (addtl && addtl_len) {
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libssh2_hmac_update(ctx, addtl, addtl_len);
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}
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libssh2_hmac_final(ctx, buf);
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libssh2_hmac_cleanup(&ctx);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_sha2_512 = {
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"hmac-sha2-512",
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64,
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64,
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mac_method_common_init,
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mac_method_hmac_sha2_512_hash,
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mac_method_common_dtor,
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};
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#endif
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#if LIBSSH2_HMAC_SHA256
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/* mac_method_hmac_sha256_hash
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* Calculate hash using full sha256 value
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*/
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static int
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mac_method_hmac_sha2_256_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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libssh2_hmac_ctx ctx;
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unsigned char seqno_buf[4];
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(void) session;
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_libssh2_htonu32(seqno_buf, seqno);
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libssh2_hmac_ctx_init(ctx);
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libssh2_hmac_sha256_init(&ctx, *abstract, 32);
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libssh2_hmac_update(ctx, seqno_buf, 4);
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libssh2_hmac_update(ctx, packet, packet_len);
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if (addtl && addtl_len) {
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libssh2_hmac_update(ctx, addtl, addtl_len);
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}
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libssh2_hmac_final(ctx, buf);
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libssh2_hmac_cleanup(&ctx);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_sha2_256 = {
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"hmac-sha2-256",
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32,
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32,
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mac_method_common_init,
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mac_method_hmac_sha2_256_hash,
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mac_method_common_dtor,
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};
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#endif
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/* mac_method_hmac_sha1_hash
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* Calculate hash using full sha1 value
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*/
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static int
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mac_method_hmac_sha1_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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libssh2_hmac_ctx ctx;
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unsigned char seqno_buf[4];
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(void) session;
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_libssh2_htonu32(seqno_buf, seqno);
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libssh2_hmac_ctx_init(ctx);
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libssh2_hmac_sha1_init(&ctx, *abstract, 20);
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libssh2_hmac_update(ctx, seqno_buf, 4);
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libssh2_hmac_update(ctx, packet, packet_len);
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if (addtl && addtl_len) {
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libssh2_hmac_update(ctx, addtl, addtl_len);
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}
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libssh2_hmac_final(ctx, buf);
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libssh2_hmac_cleanup(&ctx);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_sha1 = {
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"hmac-sha1",
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20,
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20,
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mac_method_common_init,
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mac_method_hmac_sha1_hash,
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mac_method_common_dtor,
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};
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/* mac_method_hmac_sha1_96_hash
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* Calculate hash using first 96 bits of sha1 value
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*/
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static int
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mac_method_hmac_sha1_96_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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unsigned char temp[SHA_DIGEST_LENGTH];
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mac_method_hmac_sha1_hash(session, temp, seqno, packet, packet_len,
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addtl, addtl_len, abstract);
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memcpy(buf, (char *) temp, 96 / 8);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_sha1_96 = {
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"hmac-sha1-96",
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12,
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20,
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mac_method_common_init,
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mac_method_hmac_sha1_96_hash,
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mac_method_common_dtor,
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};
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#if LIBSSH2_MD5
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/* mac_method_hmac_md5_hash
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* Calculate hash using full md5 value
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*/
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static int
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mac_method_hmac_md5_hash(LIBSSH2_SESSION * session, unsigned char *buf,
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uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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libssh2_hmac_ctx ctx;
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unsigned char seqno_buf[4];
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(void) session;
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_libssh2_htonu32(seqno_buf, seqno);
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libssh2_hmac_ctx_init(ctx);
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libssh2_hmac_md5_init(&ctx, *abstract, 16);
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libssh2_hmac_update(ctx, seqno_buf, 4);
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libssh2_hmac_update(ctx, packet, packet_len);
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if (addtl && addtl_len) {
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libssh2_hmac_update(ctx, addtl, addtl_len);
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}
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libssh2_hmac_final(ctx, buf);
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libssh2_hmac_cleanup(&ctx);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_md5 = {
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"hmac-md5",
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16,
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16,
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mac_method_common_init,
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mac_method_hmac_md5_hash,
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mac_method_common_dtor,
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};
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/* mac_method_hmac_md5_96_hash
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* Calculate hash using first 96 bits of md5 value
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*/
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static int
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mac_method_hmac_md5_96_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len, void **abstract)
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{
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unsigned char temp[MD5_DIGEST_LENGTH];
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mac_method_hmac_md5_hash(session, temp, seqno, packet, packet_len,
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addtl, addtl_len, abstract);
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memcpy(buf, (char *) temp, 96 / 8);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_md5_96 = {
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"hmac-md5-96",
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12,
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16,
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mac_method_common_init,
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mac_method_hmac_md5_96_hash,
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mac_method_common_dtor,
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};
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#endif /* LIBSSH2_MD5 */
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#if LIBSSH2_HMAC_RIPEMD
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/* mac_method_hmac_ripemd160_hash
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* Calculate hash using ripemd160 value
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*/
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static int
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mac_method_hmac_ripemd160_hash(LIBSSH2_SESSION * session,
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unsigned char *buf, uint32_t seqno,
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const unsigned char *packet,
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uint32_t packet_len,
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const unsigned char *addtl,
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uint32_t addtl_len,
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void **abstract)
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{
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libssh2_hmac_ctx ctx;
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unsigned char seqno_buf[4];
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(void) session;
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_libssh2_htonu32(seqno_buf, seqno);
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libssh2_hmac_ctx_init(ctx);
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libssh2_hmac_ripemd160_init(&ctx, *abstract, 20);
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libssh2_hmac_update(ctx, seqno_buf, 4);
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libssh2_hmac_update(ctx, packet, packet_len);
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if (addtl && addtl_len) {
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libssh2_hmac_update(ctx, addtl, addtl_len);
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}
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libssh2_hmac_final(ctx, buf);
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libssh2_hmac_cleanup(&ctx);
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return 0;
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}
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static const LIBSSH2_MAC_METHOD mac_method_hmac_ripemd160 = {
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"hmac-ripemd160",
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20,
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20,
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mac_method_common_init,
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mac_method_hmac_ripemd160_hash,
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mac_method_common_dtor,
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};
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static const LIBSSH2_MAC_METHOD mac_method_hmac_ripemd160_openssh_com = {
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"hmac-ripemd160@openssh.com",
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20,
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20,
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mac_method_common_init,
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mac_method_hmac_ripemd160_hash,
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mac_method_common_dtor,
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};
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#endif /* LIBSSH2_HMAC_RIPEMD */
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static const LIBSSH2_MAC_METHOD *mac_methods[] = {
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#if LIBSSH2_HMAC_SHA256
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&mac_method_hmac_sha2_256,
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#endif
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#if LIBSSH2_HMAC_SHA512
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&mac_method_hmac_sha2_512,
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#endif
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&mac_method_hmac_sha1,
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&mac_method_hmac_sha1_96,
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#if LIBSSH2_MD5
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&mac_method_hmac_md5,
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&mac_method_hmac_md5_96,
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#endif
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#if LIBSSH2_HMAC_RIPEMD
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&mac_method_hmac_ripemd160,
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&mac_method_hmac_ripemd160_openssh_com,
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#endif /* LIBSSH2_HMAC_RIPEMD */
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#ifdef LIBSSH2_MAC_NONE
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&mac_method_none,
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#endif /* LIBSSH2_MAC_NONE */
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NULL
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};
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const LIBSSH2_MAC_METHOD **
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_libssh2_mac_methods(void)
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{
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return mac_methods;
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}
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Block a user