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 void 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 63 #ifdef HAVE_CRYPTO 64 static void 65 hast_sha256_checksum(const unsigned char *data, size_t size, 66 unsigned char *hash, size_t *hsizep) 67 { 68 SHA256_CTX ctx; 69 70 SHA256_Init(&ctx); 71 SHA256_Update(&ctx, data, size); 72 SHA256_Final(hash, &ctx); 73 *hsizep = SHA256_DIGEST_LENGTH; 74 } 75 #endif /* HAVE_CRYPTO */ 76 77 const char * 78 checksum_name(int num) 79 { 80 81 switch (num) { 82 case HAST_CHECKSUM_NONE: 83 return ("none"); 84 case HAST_CHECKSUM_CRC32: 85 return ("crc32"); 86 case HAST_CHECKSUM_SHA256: 87 return ("sha256"); 88 } 89 return ("unknown"); 90 } 91 92 int 93 checksum_send(const struct hast_resource *res, struct nv *nv, void **datap, 94 size_t *sizep, bool *freedatap __unused) 95 { 96 unsigned char hash[MAX_HASH_SIZE]; 97 size_t hsize; 98 99 switch (res->hr_checksum) { 100 case HAST_CHECKSUM_NONE: 101 return (0); 102 case HAST_CHECKSUM_CRC32: 103 hast_crc32_checksum(*datap, *sizep, hash, &hsize); 104 break; 105 #ifdef HAVE_CRYPTO 106 case HAST_CHECKSUM_SHA256: 107 hast_sha256_checksum(*datap, *sizep, hash, &hsize); 108 break; 109 #endif 110 default: 111 PJDLOG_ABORT("Invalid checksum: %d.", res->hr_checksum); 112 } 113 nv_add_string(nv, checksum_name(res->hr_checksum), "checksum"); 114 nv_add_uint8_array(nv, hash, hsize, "hash"); 115 if (nv_error(nv) != 0) { 116 errno = nv_error(nv); 117 return (-1); 118 } 119 return (0); 120 } 121 122 int 123 checksum_recv(const struct hast_resource *res __unused, struct nv *nv, 124 void **datap, size_t *sizep, bool *freedatap __unused) 125 { 126 unsigned char chash[MAX_HASH_SIZE]; 127 const unsigned char *rhash; 128 size_t chsize, rhsize; 129 const char *algo; 130 131 algo = nv_get_string(nv, "checksum"); 132 if (algo == NULL) 133 return (0); /* No checksum. */ 134 rhash = nv_get_uint8_array(nv, &rhsize, "hash"); 135 if (rhash == NULL) { 136 pjdlog_error("Hash is missing."); 137 return (-1); /* Hash not found. */ 138 } 139 if (strcmp(algo, "crc32") == 0) 140 hast_crc32_checksum(*datap, *sizep, chash, &chsize); 141 #ifdef HAVE_CRYPTO 142 else if (strcmp(algo, "sha256") == 0) 143 hast_sha256_checksum(*datap, *sizep, chash, &chsize); 144 #endif 145 else { 146 pjdlog_error("Unknown checksum algorithm '%s'.", algo); 147 return (-1); /* Unknown checksum algorithm. */ 148 } 149 if (rhsize != chsize) { 150 pjdlog_error("Invalid hash size (%zu) for %s, should be %zu.", 151 rhsize, algo, chsize); 152 return (-1); /* Different hash size. */ 153 } 154 if (bcmp(rhash, chash, chsize) != 0) { 155 pjdlog_error("Hash mismatch."); 156 return (-1); /* Hash mismatch. */ 157 } 158 159 return (0); 160 } 161