mirror of
https://github.com/libssh2/libssh2.git
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386e012292
Since they use our own PEM parser which did not support encrypted PEM files, trying to use such files on these backends failed. Fix that by augmenting the PEM parser to support encrypted PEM files.
350 lines
10 KiB
C
350 lines
10 KiB
C
/* Copyright (c) 2009, 2010 Simon Josefsson <simon@josefsson.org>
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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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#ifdef LIBSSH2_CRYPT_NONE
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/* crypt_none_crypt
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* Minimalist cipher: VERY secure *wink*
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*/
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static int
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crypt_none_crypt(LIBSSH2_SESSION * session, unsigned char *buf,
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void **abstract)
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{
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/* Do nothing to the data! */
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return 0;
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}
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_none = {
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"none",
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"DEK-Info: NONE"
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8, /* blocksize (SSH2 defines minimum blocksize as 8) */
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0, /* iv_len */
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0, /* secret_len */
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0, /* flags */
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NULL,
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crypt_none_crypt,
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NULL
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};
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#endif /* LIBSSH2_CRYPT_NONE */
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struct crypt_ctx
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{
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int encrypt;
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_libssh2_cipher_type(algo);
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_libssh2_cipher_ctx h;
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};
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static int
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crypt_init(LIBSSH2_SESSION * session,
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const LIBSSH2_CRYPT_METHOD * method,
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unsigned char *iv, int *free_iv,
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unsigned char *secret, int *free_secret,
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int encrypt, void **abstract)
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{
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struct crypt_ctx *ctx = LIBSSH2_ALLOC(session,
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sizeof(struct crypt_ctx));
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if (!ctx)
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return LIBSSH2_ERROR_ALLOC;
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ctx->encrypt = encrypt;
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ctx->algo = method->algo;
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if (_libssh2_cipher_init(&ctx->h, ctx->algo, iv, secret, encrypt)) {
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LIBSSH2_FREE(session, ctx);
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return -1;
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}
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*abstract = ctx;
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*free_iv = 1;
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*free_secret = 1;
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return 0;
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}
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static int
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crypt_encrypt(LIBSSH2_SESSION * session, unsigned char *block,
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size_t blocksize, void **abstract)
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{
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struct crypt_ctx *cctx = *(struct crypt_ctx **) abstract;
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(void) session;
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return _libssh2_cipher_crypt(&cctx->h, cctx->algo, cctx->encrypt, block,
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blocksize);
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}
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static int
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crypt_dtor(LIBSSH2_SESSION * session, void **abstract)
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{
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struct crypt_ctx **cctx = (struct crypt_ctx **) abstract;
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if (cctx && *cctx) {
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_libssh2_cipher_dtor(&(*cctx)->h);
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LIBSSH2_FREE(session, *cctx);
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*abstract = NULL;
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}
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return 0;
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}
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#if LIBSSH2_AES_CTR
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_ctr = {
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"aes128-ctr",
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"",
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16, /* blocksize */
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16, /* initial value length */
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16, /* secret length -- 16*8 == 128bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes128ctr
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};
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_ctr = {
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"aes192-ctr",
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"",
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16, /* blocksize */
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16, /* initial value length */
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24, /* secret length -- 24*8 == 192bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes192ctr
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};
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_ctr = {
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"aes256-ctr",
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"",
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16, /* blocksize */
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16, /* initial value length */
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32, /* secret length -- 32*8 == 256bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes256ctr
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};
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#endif
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#if LIBSSH2_AES
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes128_cbc = {
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"aes128-cbc",
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"DEK-Info: AES-128-CBC",
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16, /* blocksize */
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16, /* initial value length */
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16, /* secret length -- 16*8 == 128bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes128
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};
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes192_cbc = {
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"aes192-cbc",
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"DEK-Info: AES-192-CBC",
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16, /* blocksize */
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16, /* initial value length */
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24, /* secret length -- 24*8 == 192bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes192
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};
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_aes256_cbc = {
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"aes256-cbc",
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"DEK-Info: AES-256-CBC",
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16, /* blocksize */
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16, /* initial value length */
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32, /* secret length -- 32*8 == 256bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes256
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};
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/* rijndael-cbc@lysator.liu.se == aes256-cbc */
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static const LIBSSH2_CRYPT_METHOD
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libssh2_crypt_method_rijndael_cbc_lysator_liu_se = {
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"rijndael-cbc@lysator.liu.se",
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"DEK-Info: AES-256-CBC",
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16, /* blocksize */
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16, /* initial value length */
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32, /* secret length -- 32*8 == 256bit */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_aes256
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};
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#endif /* LIBSSH2_AES */
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#if LIBSSH2_BLOWFISH
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_blowfish_cbc = {
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"blowfish-cbc",
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"",
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8, /* blocksize */
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8, /* initial value length */
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16, /* secret length */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_blowfish
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};
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#endif /* LIBSSH2_BLOWFISH */
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#if LIBSSH2_RC4
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour = {
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"arcfour",
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"DEK-Info: RC4",
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8, /* blocksize */
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8, /* initial value length */
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16, /* secret length */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_arcfour
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};
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static int
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crypt_init_arcfour128(LIBSSH2_SESSION * session,
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const LIBSSH2_CRYPT_METHOD * method,
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unsigned char *iv, int *free_iv,
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unsigned char *secret, int *free_secret,
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int encrypt, void **abstract)
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{
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int rc;
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rc = crypt_init (session, method, iv, free_iv, secret, free_secret,
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encrypt, abstract);
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if (rc == 0) {
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struct crypt_ctx *cctx = *(struct crypt_ctx **) abstract;
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unsigned char block[8];
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size_t discard = 1536;
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for (; discard; discard -= 8)
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_libssh2_cipher_crypt(&cctx->h, cctx->algo, cctx->encrypt, block,
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method->blocksize);
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}
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return rc;
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}
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_arcfour128 = {
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"arcfour128",
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"",
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8, /* blocksize */
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8, /* initial value length */
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16, /* secret length */
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0, /* flags */
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&crypt_init_arcfour128,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_arcfour
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};
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#endif /* LIBSSH2_RC4 */
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#if LIBSSH2_CAST
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_cast128_cbc = {
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"cast128-cbc",
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"",
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8, /* blocksize */
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8, /* initial value length */
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16, /* secret length */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_cast5
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};
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#endif /* LIBSSH2_CAST */
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#if LIBSSH2_3DES
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static const LIBSSH2_CRYPT_METHOD libssh2_crypt_method_3des_cbc = {
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"3des-cbc",
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"DEK-Info: DES-EDE3-CBC",
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8, /* blocksize */
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8, /* initial value length */
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24, /* secret length */
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0, /* flags */
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&crypt_init,
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&crypt_encrypt,
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&crypt_dtor,
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_libssh2_cipher_3des
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};
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#endif
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static const LIBSSH2_CRYPT_METHOD *_libssh2_crypt_methods[] = {
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#if LIBSSH2_AES_CTR
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&libssh2_crypt_method_aes128_ctr,
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&libssh2_crypt_method_aes192_ctr,
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&libssh2_crypt_method_aes256_ctr,
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#endif /* LIBSSH2_AES */
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#if LIBSSH2_AES
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&libssh2_crypt_method_aes256_cbc,
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&libssh2_crypt_method_rijndael_cbc_lysator_liu_se, /* == aes256-cbc */
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&libssh2_crypt_method_aes192_cbc,
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&libssh2_crypt_method_aes128_cbc,
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#endif /* LIBSSH2_AES */
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#if LIBSSH2_BLOWFISH
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&libssh2_crypt_method_blowfish_cbc,
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#endif /* LIBSSH2_BLOWFISH */
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#if LIBSSH2_RC4
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&libssh2_crypt_method_arcfour128,
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&libssh2_crypt_method_arcfour,
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#endif /* LIBSSH2_RC4 */
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#if LIBSSH2_CAST
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&libssh2_crypt_method_cast128_cbc,
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#endif /* LIBSSH2_CAST */
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#if LIBSSH2_3DES
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&libssh2_crypt_method_3des_cbc,
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#endif /* LIBSSH2_DES */
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#ifdef LIBSSH2_CRYPT_NONE
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&libssh2_crypt_method_none,
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#endif
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NULL
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};
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/* Expose to kex.c */
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const LIBSSH2_CRYPT_METHOD **
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libssh2_crypt_methods(void)
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{
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return _libssh2_crypt_methods;
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}
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