Bill Richardson | 4e4c196 | 2015-02-03 17:07:15 -0800 | [diff] [blame] | 1 | /* Copyright 2015 The Chromium OS Authors. All rights reserved. |
| 2 | * Use of this source code is governed by a BSD-style license that can be |
| 3 | * found in the LICENSE file. |
| 4 | */ |
| 5 | |
| 6 | #include <getopt.h> |
| 7 | #include <stdio.h> |
| 8 | #include <unistd.h> |
| 9 | |
Bill Richardson | 4e4c196 | 2015-02-03 17:07:15 -0800 | [diff] [blame] | 10 | #include <openssl/pem.h> |
| 11 | |
| 12 | #include "2sysincludes.h" |
| 13 | #include "2common.h" |
| 14 | #include "2guid.h" |
| 15 | #include "2rsa.h" |
| 16 | #include "util_misc.h" |
| 17 | #include "vb2_common.h" |
| 18 | #include "vb2_struct.h" |
| 19 | |
| 20 | #include "host_key.h" |
| 21 | #include "host_key2.h" |
| 22 | #include "host_misc2.h" |
| 23 | |
| 24 | #include "futility.h" |
| 25 | |
| 26 | /* Command line options */ |
| 27 | enum { |
| 28 | OPT_OUTFILE = 1000, |
| 29 | OPT_VERSION, |
| 30 | OPT_DESC, |
| 31 | OPT_GUID, |
| 32 | OPT_HASH_ALG, |
| 33 | }; |
| 34 | |
| 35 | #define DEFAULT_VERSION 1 |
| 36 | #define DEFAULT_HASH VB2_HASH_SHA256; |
| 37 | |
| 38 | static char *infile, *outfile, *outext; |
| 39 | static uint32_t opt_version = DEFAULT_VERSION; |
| 40 | enum vb2_hash_algorithm opt_hash_alg = DEFAULT_HASH; |
| 41 | static char *opt_desc; |
| 42 | static struct vb2_guid opt_guid; |
| 43 | |
| 44 | static const struct option long_opts[] = { |
| 45 | {"version", 1, 0, OPT_VERSION}, |
| 46 | {"desc", 1, 0, OPT_DESC}, |
| 47 | {"guid", 1, 0, OPT_GUID}, |
| 48 | {"hash_alg", 1, 0, OPT_HASH_ALG}, |
| 49 | {NULL, 0, 0, 0} |
| 50 | }; |
| 51 | |
| 52 | static void print_help(const char *progname) |
| 53 | { |
| 54 | struct vb2_text_vs_enum *entry; |
| 55 | |
| 56 | printf("\n" |
| 57 | "Usage: " MYNAME " %s [options] <INFILE> [<BASENAME>]\n", progname); |
| 58 | printf("\n" |
| 59 | "Create a keypair from an RSA key (.pem file).\n" |
| 60 | "\n" |
| 61 | "Options:\n" |
| 62 | "\n" |
| 63 | " --version <number> Key version (default %d)\n" |
| 64 | " --hash_alg <number> Hashing algorithm to use:\n", |
| 65 | DEFAULT_VERSION); |
| 66 | for (entry = vb2_text_vs_hash; entry->name; entry++) |
| 67 | printf(" %d / %s%s\n", |
| 68 | entry->num, entry->name, |
| 69 | entry->num == VB2_HASH_SHA256 ? " (default)" : ""); |
| 70 | printf( |
| 71 | " --guid <guid> Identifier for this keypair (vb21 only)\n" |
| 72 | " --desc <text> Human-readable description (vb21 only)\n" |
| 73 | "\n"); |
| 74 | |
| 75 | } |
| 76 | |
| 77 | static int vb1_make_keypair() |
| 78 | { |
| 79 | VbPrivateKey *privkey = 0; |
| 80 | VbPublicKey *pubkey = 0; |
| 81 | RSA *rsa_key = 0; |
| 82 | uint8_t *keyb_data = 0; |
| 83 | uint32_t keyb_size; |
| 84 | enum vb2_signature_algorithm sig_alg; |
| 85 | uint64_t vb1_algorithm; |
| 86 | FILE *fp; |
| 87 | int ret = 1; |
| 88 | |
| 89 | fp = fopen(infile, "rb"); |
| 90 | if (!fp) { |
| 91 | fprintf(stderr, "Unable to open %s\n", infile); |
| 92 | goto done; |
| 93 | } |
| 94 | |
| 95 | rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL); |
| 96 | fclose(fp); |
| 97 | |
| 98 | if (!rsa_key) { |
| 99 | fprintf(stderr, "Unable to read RSA key from %s\n", infile); |
| 100 | goto done; |
| 101 | } |
| 102 | |
| 103 | sig_alg = vb2_rsa_sig_alg(rsa_key); |
| 104 | if (sig_alg == VB2_SIG_INVALID) { |
| 105 | fprintf(stderr, "Unsupported sig algorithm in RSA key\n"); |
| 106 | goto done; |
| 107 | } |
| 108 | |
| 109 | /* combine the sig_alg with the hash_alg to get the vb1 algorithm */ |
| 110 | vb1_algorithm = (sig_alg - VB2_SIG_RSA1024) * 3 |
| 111 | + opt_hash_alg - VB2_HASH_SHA1; |
| 112 | |
| 113 | /* Create the private key */ |
| 114 | privkey = (VbPrivateKey *)malloc(sizeof(VbPrivateKey)); |
| 115 | if (!privkey) |
| 116 | goto done; |
| 117 | |
| 118 | privkey->rsa_private_key = rsa_key; |
| 119 | privkey->algorithm = vb1_algorithm; |
| 120 | |
| 121 | /* Write it out */ |
| 122 | strcpy(outext, ".vbprivk"); |
| 123 | if (0 != PrivateKeyWrite(outfile, privkey)) { |
| 124 | fprintf(stderr, "unable to write private key\n"); |
| 125 | goto done; |
| 126 | } |
| 127 | fprintf(stderr, "wrote %s\n", outfile); |
| 128 | |
| 129 | /* Create the public key */ |
| 130 | ret = vb_keyb_from_rsa(rsa_key, &keyb_data, &keyb_size); |
| 131 | if (ret) { |
| 132 | fprintf(stderr, "couldn't extract the public key\n"); |
| 133 | goto done; |
| 134 | } |
| 135 | |
| 136 | pubkey = PublicKeyAlloc(keyb_size, vb1_algorithm, opt_version); |
| 137 | if (!pubkey) |
| 138 | goto done; |
| 139 | memcpy(GetPublicKeyData(pubkey), keyb_data, keyb_size); |
| 140 | |
| 141 | /* Write it out */ |
| 142 | strcpy(outext, ".vbpubk"); |
| 143 | if (0 != PublicKeyWrite(outfile, pubkey)) { |
| 144 | fprintf(stderr, "unable to write public key\n"); |
| 145 | goto done; |
| 146 | } |
| 147 | fprintf(stderr, "wrote %s\n", outfile); |
| 148 | |
| 149 | ret = 0; |
| 150 | |
| 151 | done: |
| 152 | free(privkey); |
| 153 | free(pubkey); |
| 154 | free(keyb_data); |
| 155 | RSA_free(rsa_key); |
| 156 | return ret; |
| 157 | } |
| 158 | |
| 159 | static int vb2_make_keypair() |
| 160 | { |
| 161 | struct vb2_private_key *privkey = 0; |
| 162 | struct vb2_public_key *pubkey = 0; |
| 163 | RSA *rsa_key = 0; |
| 164 | uint8_t *keyb_data = 0; |
| 165 | uint32_t keyb_size; |
| 166 | enum vb2_signature_algorithm sig_alg; |
| 167 | uint8_t *pubkey_buf = 0; |
| 168 | |
| 169 | FILE *fp; |
| 170 | int ret = 1; |
| 171 | |
| 172 | fp = fopen(infile, "rb"); |
| 173 | if (!fp) { |
| 174 | fprintf(stderr, "Unable to open %s\n", infile); |
| 175 | goto done; |
| 176 | } |
| 177 | |
| 178 | rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL); |
| 179 | fclose(fp); |
| 180 | |
| 181 | if (!rsa_key) { |
| 182 | fprintf(stderr, "Unable to read RSA key from %s\n", infile); |
| 183 | goto done; |
| 184 | } |
| 185 | |
| 186 | sig_alg = vb2_rsa_sig_alg(rsa_key); |
| 187 | if (sig_alg == VB2_SIG_INVALID) { |
| 188 | fprintf(stderr, "Unsupported sig algorithm in RSA key\n"); |
| 189 | goto done; |
| 190 | } |
| 191 | |
| 192 | /* Create the private key */ |
| 193 | privkey = calloc(1, sizeof(*privkey)); |
| 194 | if (!privkey) { |
| 195 | fprintf(stderr, "Unable to allocate the private key\n"); |
| 196 | goto done; |
| 197 | } |
| 198 | privkey->rsa_private_key = rsa_key; |
| 199 | privkey->sig_alg = sig_alg; |
| 200 | privkey->hash_alg = opt_hash_alg; |
| 201 | privkey->guid = opt_guid; |
| 202 | if (opt_desc && vb2_private_key_set_desc(privkey, opt_desc)) { |
| 203 | fprintf(stderr, "Unable to set the private key description\n"); |
| 204 | goto done; |
| 205 | } |
| 206 | |
| 207 | /* Write it out */ |
| 208 | strcpy(outext, ".vbprik2"); |
| 209 | if (vb2_private_key_write(privkey, outfile)) { |
| 210 | fprintf(stderr, "unable to write private key\n"); |
| 211 | goto done; |
| 212 | } |
| 213 | fprintf(stderr, "wrote %s\n", outfile); |
| 214 | |
| 215 | /* Create the public key */ |
| 216 | if (vb2_public_key_alloc(&pubkey, sig_alg)) { |
| 217 | fprintf(stderr, "Unable to allocate the public key\n"); |
| 218 | goto done; |
| 219 | } |
| 220 | |
| 221 | /* Extract the keyb blob */ |
| 222 | if (vb_keyb_from_rsa(rsa_key, &keyb_data, &keyb_size)) { |
| 223 | fprintf(stderr, "Couldn't extract the public key\n"); |
| 224 | goto done; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Copy the keyb blob to the public key's buffer, because that's where |
| 229 | * vb2_unpack_key_data() and vb2_public_key_pack() expect to find it. |
| 230 | */ |
| 231 | pubkey_buf = vb2_public_key_packed_data(pubkey); |
| 232 | memcpy(pubkey_buf, keyb_data, keyb_size); |
| 233 | |
| 234 | /* Fill in the internal struct pointers */ |
| 235 | if (vb2_unpack_key_data(pubkey, pubkey_buf, keyb_size)) { |
| 236 | fprintf(stderr, "Unable to unpack the public key blob\n"); |
| 237 | goto done; |
| 238 | } |
| 239 | |
| 240 | pubkey->hash_alg = opt_hash_alg; |
| 241 | pubkey->version = opt_version; |
| 242 | memcpy((struct vb2_guid *)pubkey->guid, &opt_guid, sizeof(opt_guid)); |
| 243 | if (opt_desc && vb2_public_key_set_desc(pubkey, opt_desc)) { |
| 244 | fprintf(stderr, "Unable to set pubkey description\n"); |
| 245 | goto done; |
| 246 | } |
| 247 | |
| 248 | /* Write it out */ |
| 249 | strcpy(outext, ".vbpubk2"); |
| 250 | if (vb2_public_key_write(pubkey, outfile)) { |
| 251 | fprintf(stderr, "unable to write public key\n"); |
| 252 | goto done; |
| 253 | } |
| 254 | fprintf(stderr, "wrote %s\n", outfile); |
| 255 | |
| 256 | ret = 0; |
| 257 | |
| 258 | done: |
| 259 | RSA_free(rsa_key); |
| 260 | if (privkey) /* prevent double-free */ |
| 261 | privkey->rsa_private_key = 0; |
| 262 | vb2_private_key_free(privkey); |
| 263 | vb2_public_key_free(pubkey); |
| 264 | free(keyb_data); |
| 265 | return ret; |
| 266 | } |
| 267 | |
| 268 | static int do_create(int argc, char *argv[]) |
| 269 | { |
| 270 | int errorcnt = 0; |
| 271 | char *e, *s; |
| 272 | int i, r, len, remove_ext = 0; |
| 273 | const struct vb2_text_vs_enum *entry; |
| 274 | |
| 275 | while ((i = getopt_long(argc, argv, "", long_opts, NULL)) != -1) { |
| 276 | switch (i) { |
| 277 | |
| 278 | case OPT_VERSION: |
| 279 | opt_version = strtoul(optarg, &e, 0); |
| 280 | if (!*optarg || (e && *e)) { |
| 281 | fprintf(stderr, |
| 282 | "invalid version \"%s\"\n", optarg); |
| 283 | errorcnt = 1; |
| 284 | } |
| 285 | break; |
| 286 | |
| 287 | case OPT_DESC: |
| 288 | opt_desc = optarg; |
| 289 | break; |
| 290 | |
| 291 | case OPT_GUID: |
| 292 | if (VB2_SUCCESS != vb2_str_to_guid(optarg, |
| 293 | &opt_guid)) { |
| 294 | fprintf(stderr, "invalid guid \"%s\"\n", |
| 295 | optarg); |
| 296 | errorcnt = 1; |
| 297 | } |
| 298 | break; |
| 299 | |
| 300 | case OPT_HASH_ALG: |
| 301 | /* try string first */ |
| 302 | entry = vb2_lookup_by_name(vb2_text_vs_hash, optarg); |
| 303 | if (entry) { |
| 304 | opt_hash_alg = entry->num; |
| 305 | break; |
| 306 | } |
| 307 | /* fine, try number */ |
| 308 | opt_hash_alg = strtoul(optarg, &e, 0); |
| 309 | if (!*optarg || (e && *e)) { |
| 310 | fprintf(stderr, |
| 311 | "invalid hash_alg \"%s\"\n", optarg); |
| 312 | errorcnt++; |
| 313 | break; |
| 314 | } |
| 315 | if (!vb2_lookup_by_num(vb2_text_vs_hash, |
| 316 | opt_hash_alg)) { |
| 317 | fprintf(stderr, |
| 318 | "Hash algorithm %d is unsupported\n", |
| 319 | opt_hash_alg); |
| 320 | errorcnt++; |
| 321 | } |
| 322 | break; |
| 323 | |
| 324 | case '?': |
| 325 | if (optopt) |
| 326 | fprintf(stderr, "Unrecognized option: -%c\n", |
| 327 | optopt); |
| 328 | else |
| 329 | fprintf(stderr, "Unrecognized option\n"); |
| 330 | errorcnt++; |
| 331 | break; |
| 332 | case ':': |
| 333 | fprintf(stderr, "Missing argument to -%c\n", optopt); |
| 334 | errorcnt++; |
| 335 | break; |
| 336 | case 0: /* handled option */ |
| 337 | break; |
| 338 | default: |
| 339 | DIE; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | /* If we don't have an input file already, we need one */ |
| 344 | if (!infile) { |
| 345 | if (argc - optind <= 0) { |
| 346 | fprintf(stderr, "ERROR: missing input filename\n"); |
| 347 | errorcnt++; |
| 348 | } else { |
| 349 | infile = argv[optind++]; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | if (errorcnt) { |
| 354 | print_help(argv[0]); |
| 355 | return 1; |
| 356 | } |
| 357 | |
| 358 | /* Decide how to determine the output filenames. */ |
| 359 | if (argc > optind) { |
| 360 | s = argv[optind++]; /* just use this */ |
| 361 | } else { |
| 362 | s = infile; /* based on pem file name */ |
| 363 | remove_ext = 1; |
| 364 | } |
| 365 | |
| 366 | /* Make an extra-large copy to leave room for filename extensions */ |
| 367 | len = strlen(s) + 20; |
| 368 | outfile = (char *)malloc(len); |
| 369 | if (!outfile) { |
| 370 | fprintf(stderr, "ERROR: malloc() failed\n"); |
| 371 | return 1; |
| 372 | } |
| 373 | strcpy(outfile, s); |
| 374 | |
| 375 | if (remove_ext) { |
| 376 | /* Find the last '/' if any, then the last '.' before that. */ |
| 377 | s = strrchr(outfile, '/'); |
| 378 | if (!s) |
| 379 | s = outfile; |
| 380 | s = strrchr(s, '.'); |
| 381 | /* Cut off the extension */ |
| 382 | if (s) |
| 383 | *s = '\0'; |
| 384 | } |
| 385 | /* Remember that spot for later */ |
| 386 | outext = outfile + strlen(outfile); |
| 387 | |
| 388 | /* Okay, do it */ |
| 389 | if (vboot_version == VBOOT_VERSION_1_0) |
| 390 | r = vb1_make_keypair(); |
| 391 | else |
| 392 | r = vb2_make_keypair(); |
| 393 | |
| 394 | free(outfile); |
| 395 | return r; |
| 396 | } |
| 397 | |
| 398 | DECLARE_FUTIL_COMMAND(create, do_create, |
| 399 | VBOOT_VERSION_ALL, |
| 400 | "Create a keypair from an RSA .pem file", |
| 401 | print_help); |