1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #ifdef _KERNEL 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #else 38 #include <stdint.h> 39 #include <string.h> 40 #include <strings.h> 41 #include <errno.h> 42 #include <assert.h> 43 #include <openssl/evp.h> 44 #define _OpenSSL_ 45 #endif 46 #include <geom/eli/g_eli.h> 47 48 #ifdef _KERNEL 49 MALLOC_DECLARE(M_ELI); 50 51 static int 52 g_eli_crypto_done(struct cryptop *crp) 53 { 54 55 crp->crp_opaque = (void *)crp; 56 wakeup(crp); 57 return (0); 58 } 59 60 static int 61 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 62 const u_char *key, size_t keysize) 63 { 64 struct crypto_session_params csp; 65 struct cryptop *crp; 66 crypto_session_t sid; 67 int error; 68 69 KASSERT(algo != CRYPTO_AES_XTS, 70 ("%s: CRYPTO_AES_XTS unexpected here", __func__)); 71 72 memset(&csp, 0, sizeof(csp)); 73 csp.csp_mode = CSP_MODE_CIPHER; 74 csp.csp_cipher_alg = algo; 75 csp.csp_ivlen = g_eli_ivlen(algo); 76 csp.csp_cipher_key = key; 77 csp.csp_cipher_klen = keysize / 8; 78 error = crypto_newsession(&sid, &csp, CRYPTOCAP_F_SOFTWARE); 79 if (error != 0) 80 return (error); 81 crp = crypto_getreq(sid, M_NOWAIT); 82 if (crp == NULL) { 83 crypto_freesession(sid); 84 return (ENOMEM); 85 } 86 87 crp->crp_payload_start = 0; 88 crp->crp_payload_length = datasize; 89 crp->crp_flags = CRYPTO_F_CBIFSYNC | CRYPTO_F_IV_SEPARATE; 90 crp->crp_op = enc ? CRYPTO_OP_ENCRYPT : CRYPTO_OP_DECRYPT; 91 memset(crp->crp_iv, 0, sizeof(crp->crp_iv)); 92 93 crp->crp_opaque = NULL; 94 crp->crp_callback = g_eli_crypto_done; 95 crp->crp_buf_type = CRYPTO_BUF_CONTIG; 96 crp->crp_ilen = datasize; 97 crp->crp_buf = (void *)data; 98 99 error = crypto_dispatch(crp); 100 if (error == 0) { 101 while (crp->crp_opaque == NULL) 102 tsleep(crp, PRIBIO, "geli", hz / 5); 103 error = crp->crp_etype; 104 } 105 106 crypto_freereq(crp); 107 crypto_freesession(sid); 108 return (error); 109 } 110 #else /* !_KERNEL */ 111 static int 112 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 113 const u_char *key, size_t keysize) 114 { 115 EVP_CIPHER_CTX *ctx; 116 const EVP_CIPHER *type; 117 u_char iv[keysize]; 118 int outsize; 119 120 assert(algo != CRYPTO_AES_XTS); 121 122 switch (algo) { 123 case CRYPTO_NULL_CBC: 124 type = EVP_enc_null(); 125 break; 126 case CRYPTO_AES_CBC: 127 switch (keysize) { 128 case 128: 129 type = EVP_aes_128_cbc(); 130 break; 131 case 192: 132 type = EVP_aes_192_cbc(); 133 break; 134 case 256: 135 type = EVP_aes_256_cbc(); 136 break; 137 default: 138 return (EINVAL); 139 } 140 break; 141 case CRYPTO_BLF_CBC: 142 type = EVP_bf_cbc(); 143 break; 144 #ifndef OPENSSL_NO_CAMELLIA 145 case CRYPTO_CAMELLIA_CBC: 146 switch (keysize) { 147 case 128: 148 type = EVP_camellia_128_cbc(); 149 break; 150 case 192: 151 type = EVP_camellia_192_cbc(); 152 break; 153 case 256: 154 type = EVP_camellia_256_cbc(); 155 break; 156 default: 157 return (EINVAL); 158 } 159 break; 160 #endif 161 case CRYPTO_3DES_CBC: 162 type = EVP_des_ede3_cbc(); 163 break; 164 default: 165 return (EINVAL); 166 } 167 168 ctx = EVP_CIPHER_CTX_new(); 169 if (ctx == NULL) 170 return (ENOMEM); 171 172 EVP_CipherInit_ex(ctx, type, NULL, NULL, NULL, enc); 173 EVP_CIPHER_CTX_set_key_length(ctx, keysize / 8); 174 EVP_CIPHER_CTX_set_padding(ctx, 0); 175 bzero(iv, sizeof(iv)); 176 EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc); 177 178 if (EVP_CipherUpdate(ctx, data, &outsize, data, datasize) == 0) { 179 EVP_CIPHER_CTX_free(ctx); 180 return (EINVAL); 181 } 182 assert(outsize == (int)datasize); 183 184 if (EVP_CipherFinal_ex(ctx, data + outsize, &outsize) == 0) { 185 EVP_CIPHER_CTX_free(ctx); 186 return (EINVAL); 187 } 188 assert(outsize == 0); 189 190 EVP_CIPHER_CTX_free(ctx); 191 return (0); 192 } 193 #endif /* !_KERNEL */ 194 195 int 196 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 197 const u_char *key, size_t keysize) 198 { 199 200 /* We prefer AES-CBC for metadata protection. */ 201 if (algo == CRYPTO_AES_XTS) 202 algo = CRYPTO_AES_CBC; 203 204 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize)); 205 } 206 207 int 208 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 209 const u_char *key, size_t keysize) 210 { 211 212 /* We prefer AES-CBC for metadata protection. */ 213 if (algo == CRYPTO_AES_XTS) 214 algo = CRYPTO_AES_CBC; 215 216 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize)); 217 } 218