g_eli_crypto.c revision 293306
1/*- 2 * Copyright (c) 2005-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/geom/eli/g_eli_crypto.c 293306 2016-01-07 05:47:34Z allanjude $"); 29 30#include <sys/param.h> 31#ifdef _KERNEL 32#include <sys/systm.h> 33#include <sys/kernel.h> 34#include <sys/malloc.h> 35#else 36#include <stdint.h> 37#include <string.h> 38#include <strings.h> 39#include <errno.h> 40#include <assert.h> 41#include <openssl/evp.h> 42#define _OpenSSL_ 43#endif 44#include <geom/eli/g_eli.h> 45 46#ifdef _KERNEL 47MALLOC_DECLARE(M_ELI); 48 49static int 50g_eli_crypto_done(struct cryptop *crp) 51{ 52 53 crp->crp_opaque = (void *)crp; 54 wakeup(crp); 55 return (0); 56} 57 58static int 59g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 60 const u_char *key, size_t keysize) 61{ 62 struct cryptoini cri; 63 struct cryptop *crp; 64 struct cryptodesc *crd; 65 uint64_t sid; 66 u_char *p; 67 int error; 68 69 KASSERT(algo != CRYPTO_AES_XTS, 70 ("%s: CRYPTO_AES_XTS unexpected here", __func__)); 71 72 bzero(&cri, sizeof(cri)); 73 cri.cri_alg = algo; 74 cri.cri_key = __DECONST(void *, key); 75 cri.cri_klen = keysize; 76 error = crypto_newsession(&sid, &cri, CRYPTOCAP_F_SOFTWARE); 77 if (error != 0) 78 return (error); 79 p = malloc(sizeof(*crp) + sizeof(*crd), M_ELI, M_NOWAIT | M_ZERO); 80 if (p == NULL) { 81 crypto_freesession(sid); 82 return (ENOMEM); 83 } 84 crp = (struct cryptop *)p; p += sizeof(*crp); 85 crd = (struct cryptodesc *)p; p += sizeof(*crd); 86 87 crd->crd_skip = 0; 88 crd->crd_len = datasize; 89 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT; 90 if (enc) 91 crd->crd_flags |= CRD_F_ENCRYPT; 92 crd->crd_alg = algo; 93 crd->crd_key = __DECONST(void *, key); 94 crd->crd_klen = keysize; 95 bzero(crd->crd_iv, sizeof(crd->crd_iv)); 96 crd->crd_next = NULL; 97 98 crp->crp_sid = sid; 99 crp->crp_ilen = datasize; 100 crp->crp_olen = datasize; 101 crp->crp_opaque = NULL; 102 crp->crp_callback = g_eli_crypto_done; 103 crp->crp_buf = (void *)data; 104 crp->crp_flags = CRYPTO_F_CBIFSYNC; 105 crp->crp_desc = crd; 106 107 error = crypto_dispatch(crp); 108 if (error == 0) { 109 while (crp->crp_opaque == NULL) 110 tsleep(crp, PRIBIO, "geli", hz / 5); 111 error = crp->crp_etype; 112 } 113 114 free(crp, M_ELI); 115 crypto_freesession(sid); 116 return (error); 117} 118#else /* !_KERNEL */ 119static int 120g_eli_crypto_cipher(u_int algo, int enc, u_char *data, size_t datasize, 121 const u_char *key, size_t keysize) 122{ 123 EVP_CIPHER_CTX ctx; 124 const EVP_CIPHER *type; 125 u_char iv[keysize]; 126 int outsize; 127 128 assert(algo != CRYPTO_AES_XTS); 129 130 switch (algo) { 131 case CRYPTO_NULL_CBC: 132 type = EVP_enc_null(); 133 break; 134 case CRYPTO_AES_CBC: 135 switch (keysize) { 136 case 128: 137 type = EVP_aes_128_cbc(); 138 break; 139 case 192: 140 type = EVP_aes_192_cbc(); 141 break; 142 case 256: 143 type = EVP_aes_256_cbc(); 144 break; 145 default: 146 return (EINVAL); 147 } 148 break; 149 case CRYPTO_BLF_CBC: 150 type = EVP_bf_cbc(); 151 break; 152#ifndef OPENSSL_NO_CAMELLIA 153 case CRYPTO_CAMELLIA_CBC: 154 switch (keysize) { 155 case 128: 156 type = EVP_camellia_128_cbc(); 157 break; 158 case 192: 159 type = EVP_camellia_192_cbc(); 160 break; 161 case 256: 162 type = EVP_camellia_256_cbc(); 163 break; 164 default: 165 return (EINVAL); 166 } 167 break; 168#endif 169 case CRYPTO_3DES_CBC: 170 type = EVP_des_ede3_cbc(); 171 break; 172 default: 173 return (EINVAL); 174 } 175 176 EVP_CIPHER_CTX_init(&ctx); 177 178 EVP_CipherInit_ex(&ctx, type, NULL, NULL, NULL, enc); 179 EVP_CIPHER_CTX_set_key_length(&ctx, keysize / 8); 180 EVP_CIPHER_CTX_set_padding(&ctx, 0); 181 bzero(iv, sizeof(iv)); 182 EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, enc); 183 184 if (EVP_CipherUpdate(&ctx, data, &outsize, data, datasize) == 0) { 185 EVP_CIPHER_CTX_cleanup(&ctx); 186 return (EINVAL); 187 } 188 assert(outsize == (int)datasize); 189 190 if (EVP_CipherFinal_ex(&ctx, data + outsize, &outsize) == 0) { 191 EVP_CIPHER_CTX_cleanup(&ctx); 192 return (EINVAL); 193 } 194 assert(outsize == 0); 195 196 EVP_CIPHER_CTX_cleanup(&ctx); 197 return (0); 198} 199#endif /* !_KERNEL */ 200 201int 202g_eli_crypto_encrypt(u_int algo, u_char *data, size_t datasize, 203 const u_char *key, size_t keysize) 204{ 205 206 /* We prefer AES-CBC for metadata protection. */ 207 if (algo == CRYPTO_AES_XTS) 208 algo = CRYPTO_AES_CBC; 209 210 return (g_eli_crypto_cipher(algo, 1, data, datasize, key, keysize)); 211} 212 213int 214g_eli_crypto_decrypt(u_int algo, u_char *data, size_t datasize, 215 const u_char *key, size_t keysize) 216{ 217 218 /* We prefer AES-CBC for metadata protection. */ 219 if (algo == CRYPTO_AES_XTS) 220 algo = CRYPTO_AES_CBC; 221 222 return (g_eli_crypto_cipher(algo, 0, data, datasize, key, keysize)); 223} 224