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 crypto_use_buf(crp, data, datasize); 96 97 error = crypto_dispatch(crp); 98 if (error == 0) { 99 while (crp->crp_opaque == NULL) 100 tsleep(crp, PRIBIO, "geli", hz / 5); 101 error = crp->crp_etype; 102 } 103 104 crypto_freereq(crp); 105 crypto_freesession(sid); 106 return (error); 107 } 108 #else /* !_KERNEL */ 109 static int 110 g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 111 const u_char *key, size_t keysize) 112 { 113 EVP_CIPHER_CTX *ctx; 114 const EVP_CIPHER *type; 115 u_char iv[keysize]; 116 int outsize; 117 118 assert(algo != CRYPTO_AES_XTS); 119 120 switch (algo) { 121 case CRYPTO_NULL_CBC: 122 type = EVP_enc_null(); 123 break; 124 case CRYPTO_AES_CBC: 125 switch (keysize) { 126 case 128: 127 type = EVP_aes_128_cbc(); 128 break; 129 case 192: 130 type = EVP_aes_192_cbc(); 131 break; 132 case 256: 133 type = EVP_aes_256_cbc(); 134 break; 135 default: 136 return (EINVAL); 137 } 138 break; 139 #ifndef OPENSSL_NO_CAMELLIA 140 case CRYPTO_CAMELLIA_CBC: 141 switch (keysize) { 142 case 128: 143 type = EVP_camellia_128_cbc(); 144 break; 145 case 192: 146 type = EVP_camellia_192_cbc(); 147 break; 148 case 256: 149 type = EVP_camellia_256_cbc(); 150 break; 151 default: 152 return (EINVAL); 153 } 154 break; 155 #endif 156 default: 157 return (EINVAL); 158 } 159 160 ctx = EVP_CIPHER_CTX_new(); 161 if (ctx == NULL) 162 return (ENOMEM); 163 164 EVP_CipherInit_ex(ctx, type, NULL, NULL, NULL, enc); 165 EVP_CIPHER_CTX_set_key_length(ctx, keysize / 8); 166 EVP_CIPHER_CTX_set_padding(ctx, 0); 167 bzero(iv, sizeof(iv)); 168 EVP_CipherInit_ex(ctx, NULL, NULL, key, iv, enc); 169 170 if (EVP_CipherUpdate(ctx, data, &outsize, data, datasize) == 0) { 171 EVP_CIPHER_CTX_free(ctx); 172 return (EINVAL); 173 } 174 assert(outsize == (int)datasize); 175 176 if (EVP_CipherFinal_ex(ctx, data + outsize, &outsize) == 0) { 177 EVP_CIPHER_CTX_free(ctx); 178 return (EINVAL); 179 } 180 assert(outsize == 0); 181 182 EVP_CIPHER_CTX_free(ctx); 183 return (0); 184 } 185 #endif /* !_KERNEL */ 186 187 int 188 g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 189 const u_char *key, size_t keysize) 190 { 191 192 /* We prefer AES-CBC for metadata protection. */ 193 if (algo == CRYPTO_AES_XTS) 194 algo = CRYPTO_AES_CBC; 195 196 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize)); 197 } 198 199 int 200 g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 201 const u_char *key, size_t keysize) 202 { 203 204 /* We prefer AES-CBC for metadata protection. */ 205 if (algo == CRYPTO_AES_XTS) 206 algo = CRYPTO_AES_CBC; 207 208 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize)); 209 } 210