1 /*- 2 * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net> 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("$FreeBSD$"); 29 30 #include <errno.h> 31 #include <string.h> 32 #include <strings.h> 33 34 #ifdef HAVE_CRYPTO 35 #include <openssl/sha.h> 36 #endif 37 38 #include <crc32.h> 39 #include <hast.h> 40 #include <nv.h> 41 #include <pjdlog.h> 42 43 #include "hast_checksum.h" 44 45 #ifdef HAVE_CRYPTO 46 #define MAX_HASH_SIZE SHA256_DIGEST_LENGTH 47 #else 48 #define MAX_HASH_SIZE 4 49 #endif 50 51 static int 52 hast_crc32_checksum(const unsigned char *data, size_t size, 53 unsigned char *hash, size_t *hsizep) 54 { 55 uint32_t crc; 56 57 crc = crc32(data, size); 58 /* XXXPJD: Do we have to use htole32() on crc first? */ 59 bcopy(&crc, hash, sizeof(crc)); 60 *hsizep = sizeof(crc); 61 62 return (0); 63 } 64 65 #ifdef HAVE_CRYPTO 66 static int 67 hast_sha256_checksum(const unsigned char *data, size_t size, 68 unsigned char *hash, size_t *hsizep) 69 { 70 SHA256_CTX ctx; 71 72 SHA256_Init(&ctx); 73 SHA256_Update(&ctx, data, size); 74 SHA256_Final(hash, &ctx); 75 *hsizep = SHA256_DIGEST_LENGTH; 76 77 return (0); 78 } 79 #endif /* HAVE_CRYPTO */ 80 81 const char * 82 checksum_name(int num) 83 { 84 85 switch (num) { 86 case HAST_CHECKSUM_NONE: 87 return ("none"); 88 case HAST_CHECKSUM_CRC32: 89 return ("crc32"); 90 case HAST_CHECKSUM_SHA256: 91 return ("sha256"); 92 } 93 return ("unknown"); 94 } 95 96 int 97 checksum_send(const struct hast_resource *res, struct nv *nv, void **datap, 98 size_t *sizep, bool *freedatap __unused) 99 { 100 unsigned char hash[MAX_HASH_SIZE]; 101 size_t hsize; 102 int ret; 103 104 switch (res->hr_checksum) { 105 case HAST_CHECKSUM_NONE: 106 return (0); 107 case HAST_CHECKSUM_CRC32: 108 ret = hast_crc32_checksum(*datap, *sizep, hash, &hsize); 109 break; 110 #ifdef HAVE_CRYPTO 111 case HAST_CHECKSUM_SHA256: 112 ret = hast_sha256_checksum(*datap, *sizep, hash, &hsize); 113 break; 114 #endif 115 default: 116 PJDLOG_ABORT("Invalid checksum: %d.", res->hr_checksum); 117 } 118 119 if (ret != 0) 120 return (ret); 121 nv_add_string(nv, checksum_name(res->hr_checksum), "checksum"); 122 nv_add_uint8_array(nv, hash, hsize, "hash"); 123 if (nv_error(nv) != 0) { 124 errno = nv_error(nv); 125 return (-1); 126 } 127 return (0); 128 } 129 130 int 131 checksum_recv(const struct hast_resource *res __unused, struct nv *nv, 132 void **datap, size_t *sizep, bool *freedatap __unused) 133 { 134 unsigned char chash[MAX_HASH_SIZE]; 135 const unsigned char *rhash; 136 size_t chsize, rhsize; 137 const char *algo; 138 int ret; 139 140 algo = nv_get_string(nv, "checksum"); 141 if (algo == NULL) 142 return (0); /* No checksum. */ 143 rhash = nv_get_uint8_array(nv, &rhsize, "hash"); 144 if (rhash == NULL) { 145 pjdlog_error("Hash is missing."); 146 return (-1); /* Hash not found. */ 147 } 148 if (strcmp(algo, "crc32") == 0) 149 ret = hast_crc32_checksum(*datap, *sizep, chash, &chsize); 150 #ifdef HAVE_CRYPTO 151 else if (strcmp(algo, "sha256") == 0) 152 ret = hast_sha256_checksum(*datap, *sizep, chash, &chsize); 153 #endif 154 else { 155 pjdlog_error("Unknown checksum algorithm '%s'.", algo); 156 return (-1); /* Unknown checksum algorithm. */ 157 } 158 if (rhsize != chsize) { 159 pjdlog_error("Invalid hash size (%zu) for %s, should be %zu.", 160 rhsize, algo, chsize); 161 return (-1); /* Different hash size. */ 162 } 163 if (bcmp(rhash, chash, chsize) != 0) { 164 pjdlog_error("Hash mismatch."); 165 return (-1); /* Hash mismatch. */ 166 } 167 168 return (0); 169 } 170