| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Verify signatures on distribuitions of files |
| 4 | * |
| 5 | * (c) 2000 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Catacomb. |
| 11 | * |
| 12 | * Catacomb is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU Library General Public License as |
| 14 | * published by the Free Software Foundation; either version 2 of the |
| 15 | * License, or (at your option) any later version. |
| 16 | * |
| 17 | * Catacomb is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU Library General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU Library General Public |
| 23 | * License along with Catacomb; if not, write to the Free |
| 24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 25 | * MA 02111-1307, USA. |
| 26 | */ |
| 27 | |
| 28 | /*----- Header files ------------------------------------------------------*/ |
| 29 | |
| 30 | #define _FILE_OFFSET_BITS 64 |
| 31 | |
| 32 | #include "config.h" |
| 33 | |
| 34 | #include <ctype.h> |
| 35 | #include <errno.h> |
| 36 | #include <stdio.h> |
| 37 | #include <stdlib.h> |
| 38 | #include <string.h> |
| 39 | |
| 40 | #include <mLib/alloc.h> |
| 41 | #include <mLib/base64.h> |
| 42 | #include <mLib/mdwopt.h> |
| 43 | #include <mLib/quis.h> |
| 44 | #include <mLib/report.h> |
| 45 | #include <mLib/sub.h> |
| 46 | |
| 47 | #include "getdate.h" |
| 48 | #include "rand.h" |
| 49 | #include "ghash.h" |
| 50 | #include "key.h" |
| 51 | #include "key-data.h" |
| 52 | #include "noise.h" |
| 53 | #include "cc.h" |
| 54 | |
| 55 | /*----- Data formatting ---------------------------------------------------*/ |
| 56 | |
| 57 | /* --- Binary data structure --- * |
| 58 | * |
| 59 | * The binary format, which is used for hashing and for the optional binary |
| 60 | * output, consists of a sequence of tagged blocks. The tag describes the |
| 61 | * format and meaining of the following data. |
| 62 | */ |
| 63 | |
| 64 | enum { |
| 65 | /* --- Block tags --- */ |
| 66 | |
| 67 | T_IDENT = 0, /* An identifying marker */ |
| 68 | T_KEYID, /* Key identifier */ |
| 69 | T_BEGIN, /* Begin hashing here */ |
| 70 | T_COMMENT = T_BEGIN, /* A textual comment */ |
| 71 | T_DATE, /* Creation date of signature */ |
| 72 | T_EXPIRE, /* Expiry date of signature */ |
| 73 | T_FILE, /* File and corresponding hash */ |
| 74 | T_SIGNATURE, /* Final signature block */ |
| 75 | |
| 76 | /* --- Error messages --- */ |
| 77 | |
| 78 | E_EOF = -1, |
| 79 | E_BIN = -2, |
| 80 | E_TAG = -3, |
| 81 | E_DATE = -4 |
| 82 | }; |
| 83 | |
| 84 | /* --- Name translation table --- */ |
| 85 | |
| 86 | static const char *tagtab[] = { |
| 87 | "ident:", "keyid:", |
| 88 | "comment:", "date:", "expires:", "file:", |
| 89 | "signature:", |
| 90 | 0 |
| 91 | }; |
| 92 | |
| 93 | static const char *errtab[] = { |
| 94 | "Off-by-one bug", |
| 95 | "Unexpected end-of-file", |
| 96 | "Binary object too large", |
| 97 | "Unrecognized tag", |
| 98 | "Bad date string" |
| 99 | }; |
| 100 | |
| 101 | /* --- Memory representation of block types --- */ |
| 102 | |
| 103 | typedef struct block { |
| 104 | int tag; /* Type tag */ |
| 105 | dstr d; /* String data */ |
| 106 | dstr b; /* Binary data */ |
| 107 | time_t t; /* Timestamp */ |
| 108 | uint32 k; /* Keyid */ |
| 109 | } block; |
| 110 | |
| 111 | /* --- @timestring@ --- * |
| 112 | * |
| 113 | * Arguments: @time_t t@ = a timestamp |
| 114 | * @dstr *d@ = a string to write on |
| 115 | * |
| 116 | * Returns: --- |
| 117 | * |
| 118 | * Use: Writes a textual representation of the timestamp to the |
| 119 | * string. |
| 120 | */ |
| 121 | |
| 122 | static void timestring(time_t t, dstr *d) |
| 123 | { |
| 124 | if (t == KEXP_FOREVER) |
| 125 | DPUTS(d, "forever"); |
| 126 | else { |
| 127 | struct tm *tm = localtime(&t); |
| 128 | DENSURE(d, 32); |
| 129 | d->len += strftime(d->buf + d->len, 32, "%Y-%m-%d %H:%M:%S %Z", tm); |
| 130 | DPUTZ(d); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | /* --- @breset@ --- * |
| 135 | * |
| 136 | * Arguments: @block *b@ = block to reset |
| 137 | * |
| 138 | * Returns: --- |
| 139 | * |
| 140 | * Use: Resets a block so that more stuff can be put in it. |
| 141 | */ |
| 142 | |
| 143 | static void breset(block *b) |
| 144 | { |
| 145 | b->tag = 0; |
| 146 | DRESET(&b->d); |
| 147 | DRESET(&b->b); |
| 148 | b->k = 0; |
| 149 | b->t = KEXP_EXPIRE; |
| 150 | } |
| 151 | |
| 152 | /* --- @binit@ --- * |
| 153 | * |
| 154 | * Arguments: @block *b@ = block to initialize |
| 155 | * |
| 156 | * Returns: --- |
| 157 | * |
| 158 | * Use: Initializes a block as something to read into. |
| 159 | */ |
| 160 | |
| 161 | static void binit(block *b) |
| 162 | { |
| 163 | dstr_create(&b->d); |
| 164 | dstr_create(&b->b); |
| 165 | breset(b); |
| 166 | } |
| 167 | |
| 168 | /* --- @bdestroy@ --- * |
| 169 | * |
| 170 | * Arguments: @block *b@ = block to destroy |
| 171 | * |
| 172 | * Returns: --- |
| 173 | * |
| 174 | * Use: Destroys a block's contents. |
| 175 | */ |
| 176 | |
| 177 | static void bdestroy(block *b) |
| 178 | { |
| 179 | dstr_destroy(&b->d); |
| 180 | dstr_destroy(&b->b); |
| 181 | } |
| 182 | |
| 183 | /* --- @bget@ --- * |
| 184 | * |
| 185 | * Arguments: @block *b@ = pointer to block |
| 186 | * @FILE *fp@ = stream to read from |
| 187 | * @unsigned bin@ = binary switch |
| 188 | * |
| 189 | * Returns: Tag of block, or an error tag. |
| 190 | * |
| 191 | * Use: Reads a block from a stream. |
| 192 | */ |
| 193 | |
| 194 | static int bget(block *b, FILE *fp, unsigned bin) |
| 195 | { |
| 196 | int tag; |
| 197 | |
| 198 | /* --- Read the tag --- */ |
| 199 | |
| 200 | if (bin) |
| 201 | tag = getc(fp); |
| 202 | else { |
| 203 | dstr d = DSTR_INIT; |
| 204 | if (getstring(fp, &d, GSF_FILE)) |
| 205 | return (E_EOF); |
| 206 | for (tag = 0; tagtab[tag]; tag++) { |
| 207 | if (strcmp(tagtab[tag], d.buf) == 0) |
| 208 | goto done; |
| 209 | } |
| 210 | return (E_TAG); |
| 211 | done:; |
| 212 | } |
| 213 | |
| 214 | /* --- Decide what to do next --- */ |
| 215 | |
| 216 | breset(b); |
| 217 | b->tag = tag; |
| 218 | switch (tag) { |
| 219 | |
| 220 | /* --- Reading of strings --- */ |
| 221 | |
| 222 | case T_IDENT: |
| 223 | case T_COMMENT: |
| 224 | if (getstring(fp, &b->d, GSF_FILE | (bin ? GSF_RAW : 0))) |
| 225 | return (E_EOF); |
| 226 | break; |
| 227 | |
| 228 | /* --- Timestamps --- */ |
| 229 | |
| 230 | case T_DATE: |
| 231 | case T_EXPIRE: |
| 232 | if (bin) { |
| 233 | octet buf[8]; |
| 234 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
| 235 | return (E_EOF); |
| 236 | b->t = ((time_t)(((LOAD32(buf + 0) << 16) << 16) & ~MASK32) | |
| 237 | (time_t)LOAD32(buf + 4)); |
| 238 | } else { |
| 239 | if (getstring(fp, &b->d, GSF_FILE)) |
| 240 | return (E_EOF); |
| 241 | if (strcmp(b->d.buf, "forever") == 0) |
| 242 | b->t = KEXP_FOREVER; |
| 243 | else if ((b->t = get_date(b->d.buf, 0)) == -1) |
| 244 | return (E_DATE); |
| 245 | } |
| 246 | break; |
| 247 | |
| 248 | /* --- Key ids --- */ |
| 249 | |
| 250 | case T_KEYID: |
| 251 | if (bin) { |
| 252 | octet buf[4]; |
| 253 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
| 254 | return (E_EOF); |
| 255 | b->k = LOAD32(buf); |
| 256 | } else { |
| 257 | if (getstring(fp, &b->d, GSF_FILE)) |
| 258 | return (E_EOF); |
| 259 | b->k = strtoul(b->d.buf, 0, 16); |
| 260 | } |
| 261 | break; |
| 262 | |
| 263 | /* --- Reading of binary data --- */ |
| 264 | |
| 265 | case T_FILE: |
| 266 | case T_SIGNATURE: |
| 267 | if (bin) { |
| 268 | octet buf[2]; |
| 269 | uint32 sz; |
| 270 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
| 271 | return (E_EOF); |
| 272 | sz = LOAD16(buf); |
| 273 | if (sz > 4096) |
| 274 | return (E_BIN); |
| 275 | DENSURE(&b->b, sz); |
| 276 | if (fread(b->b.buf + b->b.len, 1, sz, fp) < sz) |
| 277 | return (E_EOF); |
| 278 | b->b.len += sz; |
| 279 | } else { |
| 280 | base64_ctx b64; |
| 281 | if (getstring(fp, &b->d, GSF_FILE)) |
| 282 | return (E_EOF); |
| 283 | base64_init(&b64); |
| 284 | base64_decode(&b64, b->d.buf, b->d.len, &b->b); |
| 285 | base64_decode(&b64, 0, 0, &b->b); |
| 286 | DRESET(&b->d); |
| 287 | } |
| 288 | if (tag == T_FILE && |
| 289 | getstring(fp, &b->d, GSF_FILE | (bin ? GSF_RAW : 0))) |
| 290 | return (E_EOF); |
| 291 | break; |
| 292 | |
| 293 | /* --- Anything else --- */ |
| 294 | |
| 295 | default: |
| 296 | return (E_TAG); |
| 297 | } |
| 298 | |
| 299 | return (tag); |
| 300 | } |
| 301 | |
| 302 | /* --- @blob@ --- * |
| 303 | * |
| 304 | * Arguments: @block *b@ = pointer to block to emit |
| 305 | * @dstr *d@ = output buffer |
| 306 | * |
| 307 | * Returns: --- |
| 308 | * |
| 309 | * Use: Encodes a block in a binary format. |
| 310 | */ |
| 311 | |
| 312 | static void blob(block *b, dstr *d) |
| 313 | { |
| 314 | DPUTC(d, b->tag); |
| 315 | switch (b->tag) { |
| 316 | case T_IDENT: |
| 317 | case T_COMMENT: |
| 318 | DPUTD(d, &b->d); |
| 319 | DPUTC(d, 0); |
| 320 | break; |
| 321 | case T_DATE: |
| 322 | case T_EXPIRE: |
| 323 | DENSURE(d, 8); |
| 324 | if (b->t == KEXP_FOREVER) { |
| 325 | STORE32(d->buf + d->len, 0xffffffff); |
| 326 | STORE32(d->buf + d->len + 4, 0xffffffff); |
| 327 | } else { |
| 328 | STORE32(d->buf + d->len, ((b->t & ~MASK32) >> 16) >> 16); |
| 329 | STORE32(d->buf + d->len + 4, b->t); |
| 330 | } |
| 331 | d->len += 8; |
| 332 | break; |
| 333 | case T_KEYID: |
| 334 | DENSURE(d, 4); |
| 335 | STORE32(d->buf + d->len, b->k); |
| 336 | d->len += 4; |
| 337 | break; |
| 338 | case T_FILE: |
| 339 | case T_SIGNATURE: |
| 340 | DENSURE(d, 2); |
| 341 | STORE16(d->buf + d->len, b->b.len); |
| 342 | d->len += 2; |
| 343 | DPUTD(d, &b->b); |
| 344 | if (b->tag == T_FILE) { |
| 345 | DPUTD(d, &b->d); |
| 346 | DPUTC(d, 0); |
| 347 | } |
| 348 | break; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | /* --- @bwrite@ --- * |
| 353 | * |
| 354 | * Arguments: @block *b@ = pointer to block to write |
| 355 | * @FILE *fp@ = stream to write on |
| 356 | * |
| 357 | * Returns: --- |
| 358 | * |
| 359 | * Use: Writes a block on a stream in a textual format. |
| 360 | */ |
| 361 | |
| 362 | static void bwrite(block *b, FILE *fp) |
| 363 | { |
| 364 | fputs(tagtab[b->tag], fp); |
| 365 | putc(' ', fp); |
| 366 | switch (b->tag) { |
| 367 | case T_IDENT: |
| 368 | case T_COMMENT: |
| 369 | putstring(fp, b->d.buf, 0); |
| 370 | break; |
| 371 | case T_DATE: |
| 372 | case T_EXPIRE: { |
| 373 | dstr d = DSTR_INIT; |
| 374 | timestring(b->t, &d); |
| 375 | putstring(fp, d.buf, 0); |
| 376 | dstr_destroy(&d); |
| 377 | } break; |
| 378 | case T_KEYID: |
| 379 | fprintf(fp, "%08lx", (unsigned long)b->k); |
| 380 | break; |
| 381 | case T_FILE: |
| 382 | case T_SIGNATURE: { |
| 383 | dstr d = DSTR_INIT; |
| 384 | base64_ctx b64; |
| 385 | base64_init(&b64); |
| 386 | b64.maxline = 0; |
| 387 | base64_encode(&b64, b->b.buf, b->b.len, &d); |
| 388 | base64_encode(&b64, 0, 0, &d); |
| 389 | dstr_write(&d, fp); |
| 390 | if (b->tag == T_FILE) { |
| 391 | putc(' ', fp); |
| 392 | putstring(fp, b->d.buf, 0); |
| 393 | } |
| 394 | } break; |
| 395 | } |
| 396 | putc('\n', fp); |
| 397 | } |
| 398 | |
| 399 | /* --- @bemit@ --- * |
| 400 | * |
| 401 | * Arguments: @block *b@ = pointer to block to write |
| 402 | * @FILE *fp@ = file to write on |
| 403 | * @ghash *h@ = pointer to hash function |
| 404 | * @unsigned bin@ = binary/text flag |
| 405 | * |
| 406 | * Returns: --- |
| 407 | * |
| 408 | * Use: Spits out a block properly. |
| 409 | */ |
| 410 | |
| 411 | static void bemit(block *b, FILE *fp, ghash *h, unsigned bin) |
| 412 | { |
| 413 | if (h || (fp && bin)) { |
| 414 | dstr d = DSTR_INIT; |
| 415 | blob(b, &d); |
| 416 | if (h) |
| 417 | GH_HASH(h, d.buf, d.len); |
| 418 | if (fp && bin) |
| 419 | fwrite(d.buf, d.len, 1, fp); |
| 420 | } |
| 421 | if (fp && !bin) |
| 422 | bwrite(b, fp); |
| 423 | } |
| 424 | |
| 425 | /*----- Static variables --------------------------------------------------*/ |
| 426 | |
| 427 | static const char *keyring = "keyring"; |
| 428 | |
| 429 | /*----- Other shared functions --------------------------------------------*/ |
| 430 | |
| 431 | /* --- @fhex@ --- * |
| 432 | * |
| 433 | * Arguments: @FILE *fp@ = file to write on |
| 434 | * @const void *p@ = pointer to data to be written |
| 435 | * @size_t sz@ = size of the data to write |
| 436 | * |
| 437 | * Returns: --- |
| 438 | * |
| 439 | * Use: Emits a hex dump to a stream. |
| 440 | */ |
| 441 | |
| 442 | static void fhex(FILE *fp, const void *p, size_t sz) |
| 443 | { |
| 444 | const octet *q = p; |
| 445 | if (!sz) |
| 446 | return; |
| 447 | for (;;) { |
| 448 | fprintf(fp, "%02x", *q++); |
| 449 | sz--; |
| 450 | if (!sz) |
| 451 | break; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /*----- Signature generation ----------------------------------------------*/ |
| 456 | |
| 457 | static int sign(int argc, char *argv[]) |
| 458 | { |
| 459 | #define f_bogus 1u |
| 460 | #define f_bin 2u |
| 461 | #define f_nocheck 4u |
| 462 | |
| 463 | unsigned f = 0; |
| 464 | const char *ki = "dsig"; |
| 465 | key_file kf; |
| 466 | key *k; |
| 467 | sig *s; |
| 468 | fhashstate fh; |
| 469 | time_t exp = KEXP_EXPIRE; |
| 470 | unsigned verb = 0; |
| 471 | const char *ifile = 0, *hfile = 0; |
| 472 | const char *ofile = 0; |
| 473 | const char *c = 0; |
| 474 | const char *err; |
| 475 | FILE *ifp, *ofp; |
| 476 | dstr d = DSTR_INIT; |
| 477 | hfpctx hfp; |
| 478 | block b; |
| 479 | int e, hf, n; |
| 480 | |
| 481 | for (;;) { |
| 482 | static struct option opts[] = { |
| 483 | { "null", 0, 0, '0' }, |
| 484 | { "binary", 0, 0, 'b' }, |
| 485 | { "verbose", 0, 0, 'v' }, |
| 486 | { "progress", 0, 0, 'p' }, |
| 487 | { "quiet", 0, 0, 'q' }, |
| 488 | { "comment", OPTF_ARGREQ, 0, 'c' }, |
| 489 | { "file", OPTF_ARGREQ, 0, 'f' }, |
| 490 | { "hashes", OPTF_ARGREQ, 0, 'h' }, |
| 491 | { "output", OPTF_ARGREQ, 0, 'o' }, |
| 492 | { "key", OPTF_ARGREQ, 0, 'k' }, |
| 493 | { "expire", OPTF_ARGREQ, 0, 'e' }, |
| 494 | { "nocheck", OPTF_ARGREQ, 0, 'C' }, |
| 495 | { 0, 0, 0, 0 } |
| 496 | }; |
| 497 | int i = mdwopt(argc, argv, "+0vpqbC" "c:" "f:h:o:" "k:e:", |
| 498 | opts, 0, 0, 0); |
| 499 | if (i < 0) |
| 500 | break; |
| 501 | switch (i) { |
| 502 | case '0': |
| 503 | f |= GSF_RAW; |
| 504 | break; |
| 505 | case 'b': |
| 506 | f |= f_bin; |
| 507 | break; |
| 508 | case 'v': |
| 509 | verb++; |
| 510 | break; |
| 511 | case 'p': |
| 512 | f |= FHF_PROGRESS; |
| 513 | break; |
| 514 | case 'q': |
| 515 | if (verb > 0) |
| 516 | verb--; |
| 517 | break; |
| 518 | case 'C': |
| 519 | f |= f_nocheck; |
| 520 | break; |
| 521 | case 'c': |
| 522 | c = optarg; |
| 523 | break; |
| 524 | case 'f': |
| 525 | ifile = optarg; |
| 526 | break; |
| 527 | case 'h': |
| 528 | hfile = optarg; |
| 529 | break; |
| 530 | case 'o': |
| 531 | ofile = optarg; |
| 532 | break; |
| 533 | case 'k': |
| 534 | ki = optarg; |
| 535 | break; |
| 536 | case 'e': |
| 537 | if (strcmp(optarg, "forever") == 0) |
| 538 | exp = KEXP_FOREVER; |
| 539 | else if ((exp = get_date(optarg, 0)) == -1) |
| 540 | die(EXIT_FAILURE, "bad expiry time"); |
| 541 | break; |
| 542 | default: |
| 543 | f |= f_bogus; |
| 544 | break; |
| 545 | } |
| 546 | } |
| 547 | if (optind != argc || (f & f_bogus)) |
| 548 | die(EXIT_FAILURE, "Usage: sign [-OPTIONS]"); |
| 549 | if (hfile && ifile) |
| 550 | die(EXIT_FAILURE, "Inconsistent options `-h' and `-f'"); |
| 551 | |
| 552 | /* --- Locate the signing key --- */ |
| 553 | |
| 554 | if (key_open(&kf, keyring, KOPEN_WRITE, key_moan, 0)) |
| 555 | die(EXIT_FAILURE, "couldn't open keyring `%s'", keyring); |
| 556 | if ((k = key_bytag(&kf, ki)) == 0) |
| 557 | die(EXIT_FAILURE, "couldn't find key `%s'", ki); |
| 558 | key_fulltag(k, &d); |
| 559 | if (exp == KEXP_FOREVER && k->exp != KEXP_FOREVER) { |
| 560 | die(EXIT_FAILURE, "key `%s' expires: can't create nonexpiring signature", |
| 561 | d.buf); |
| 562 | } |
| 563 | s = getsig(k, "dsig", 1); |
| 564 | |
| 565 | /* --- Check the key --- */ |
| 566 | |
| 567 | if (!(f & f_nocheck) && (err = s->ops->check(s)) != 0) |
| 568 | moan("key `%s' fails check: %s", d.buf, err); |
| 569 | |
| 570 | /* --- Open files --- */ |
| 571 | |
| 572 | if (hfile) ifile = hfile; |
| 573 | if (!ifile || strcmp(ifile, "-") == 0) |
| 574 | ifp = stdin; |
| 575 | else if ((ifp = fopen(ifile, (f & f_bin) ? "rb" : "r")) == 0) { |
| 576 | die(EXIT_FAILURE, "couldn't open input file `%s': %s", |
| 577 | ifile, strerror(errno)); |
| 578 | } |
| 579 | |
| 580 | if (!ofile || strcmp(ofile, "-") == 0) |
| 581 | ofp = stdout; |
| 582 | else if ((ofp = fopen(ofile, (f & f_bin) ? "wb" : "w")) == 0) { |
| 583 | die(EXIT_FAILURE, "couldn't open output file `%s': %s", |
| 584 | ofile, strerror(errno)); |
| 585 | } |
| 586 | |
| 587 | /* --- Emit the start of the output --- */ |
| 588 | |
| 589 | binit(&b); b.tag = T_IDENT; |
| 590 | dstr_putf(&b.d, "%s, Catacomb version " VERSION, QUIS); |
| 591 | bemit(&b, ofp, 0, f & f_bin); |
| 592 | |
| 593 | breset(&b); b.tag = T_KEYID; b.k = k->id; |
| 594 | bemit(&b, ofp, 0, f & f_bin); |
| 595 | |
| 596 | /* --- Start hashing, and emit the datestamps and things --- */ |
| 597 | |
| 598 | { |
| 599 | time_t now = time(0); |
| 600 | |
| 601 | breset(&b); b.tag = T_DATE; b.t = now; bemit(&b, ofp, s->h, f & f_bin); |
| 602 | if (exp == KEXP_EXPIRE) |
| 603 | exp = now + 86400 * 28; |
| 604 | breset(&b); b.tag = T_EXPIRE; b.t = exp; bemit(&b, ofp, s->h, f & f_bin); |
| 605 | if (c) { |
| 606 | breset(&b); b.tag = T_COMMENT; DPUTS(&b.d, c); |
| 607 | bemit(&b, ofp, s->h, f & f_bin); |
| 608 | } |
| 609 | |
| 610 | if (!(f & f_bin)) |
| 611 | putc('\n', ofp); |
| 612 | } |
| 613 | |
| 614 | /* --- Now hash the various files --- */ |
| 615 | |
| 616 | if (hfile) { |
| 617 | hfp.f = f; |
| 618 | hfp.fp = ifp; |
| 619 | hfp.ee = &encodingtab[ENC_HEX]; |
| 620 | hfp.gch = GH_CLASS(s->h); |
| 621 | hfp.dline = &d; |
| 622 | hfp.dfile = &b.d; |
| 623 | |
| 624 | n = 0; |
| 625 | for (;;) { |
| 626 | breset(&b); |
| 627 | DENSURE(&b.b, hfp.gch->hashsz); |
| 628 | hfp.hbuf = (octet *)b.b.buf; |
| 629 | if (ferror(ofp)) { f |= f_bogus; break; } |
| 630 | if ((hf = hfparse(&hfp)) == HF_EOF) break; |
| 631 | n++; |
| 632 | |
| 633 | switch (hf) { |
| 634 | case HF_HASH: |
| 635 | if (hfp.gch != GH_CLASS(s->h)) { |
| 636 | moan("%s:%d: incorrect hash function `%s' (should be `%s')", |
| 637 | hfile, n, hfp.gch->name, GH_CLASS(s->h)->name); |
| 638 | f |= f_bogus; |
| 639 | } |
| 640 | break; |
| 641 | case HF_BAD: |
| 642 | moan("%s:%d: invalid hash-file line", hfile, n); |
| 643 | f |= f_bogus; |
| 644 | break; |
| 645 | case HF_FILE: |
| 646 | b.tag = T_FILE; |
| 647 | b.b.len += hfp.gch->hashsz; |
| 648 | bemit(&b, ofp, s->h, f & f_bin); |
| 649 | break; |
| 650 | } |
| 651 | } |
| 652 | } else { |
| 653 | for (;;) { |
| 654 | |
| 655 | /* --- Stop on an output error --- */ |
| 656 | |
| 657 | if (ferror(ofp)) { |
| 658 | f |= f_bogus; |
| 659 | break; |
| 660 | } |
| 661 | |
| 662 | /* --- Read the next filename to hash --- */ |
| 663 | |
| 664 | fhash_init(&fh, GH_CLASS(s->h), f | FHF_BINARY); |
| 665 | breset(&b); |
| 666 | if (getstring(ifp, &b.d, GSF_FILE | f)) |
| 667 | break; |
| 668 | b.tag = T_FILE; |
| 669 | DENSURE(&b.b, GH_CLASS(s->h)->hashsz); |
| 670 | if (fhash(&fh, b.d.buf, b.b.buf)) { |
| 671 | moan("error reading `%s': %s", b.d.buf, strerror(errno)); |
| 672 | f |= f_bogus; |
| 673 | } else { |
| 674 | b.b.len += GH_CLASS(s->h)->hashsz; |
| 675 | if (verb) { |
| 676 | fhex(stderr, b.b.buf, b.b.len); |
| 677 | fprintf(stderr, " %s\n", b.d.buf); |
| 678 | } |
| 679 | bemit(&b, ofp, s->h, f & f_bin); |
| 680 | } |
| 681 | fhash_free(&fh); |
| 682 | } |
| 683 | } |
| 684 | |
| 685 | /* --- Create the signature --- */ |
| 686 | |
| 687 | if (!(f & f_bogus)) { |
| 688 | breset(&b); |
| 689 | b.tag = T_SIGNATURE; |
| 690 | if ((e = s->ops->doit(s, &b.b)) != 0) { |
| 691 | moan("error creating signature: %s", key_strerror(e)); |
| 692 | f |= f_bogus; |
| 693 | } |
| 694 | if (!(f & f_bogus)) { |
| 695 | bemit(&b, ofp, 0, f & f_bin); |
| 696 | key_used(&kf, k, exp); |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | /* --- Tidy up at the end --- */ |
| 701 | |
| 702 | freesig(s); |
| 703 | bdestroy(&b); |
| 704 | if (ifile) |
| 705 | fclose(ifp); |
| 706 | if (ofile) { |
| 707 | if (fclose(ofp)) |
| 708 | f |= f_bogus; |
| 709 | } else { |
| 710 | if (fflush(ofp)) |
| 711 | f |= f_bogus; |
| 712 | } |
| 713 | if ((e = key_close(&kf)) != 0) { |
| 714 | switch (e) { |
| 715 | case KWRITE_FAIL: |
| 716 | die(EXIT_FAILURE, "couldn't write file `%s': %s", |
| 717 | keyring, strerror(errno)); |
| 718 | case KWRITE_BROKEN: |
| 719 | die(EXIT_FAILURE, "keyring file `%s' broken: %s (repair manually)", |
| 720 | keyring, strerror(errno)); |
| 721 | } |
| 722 | } |
| 723 | if (f & f_bogus) |
| 724 | die(EXIT_FAILURE, "error(s) occurred while creating signature"); |
| 725 | return (EXIT_SUCCESS); |
| 726 | |
| 727 | #undef f_bin |
| 728 | #undef f_bogus |
| 729 | #undef f_nocheck |
| 730 | } |
| 731 | |
| 732 | /*----- Signature verification --------------------------------------------*/ |
| 733 | |
| 734 | static int checkjunk(const char *path, const struct stat *st, void *p) |
| 735 | { |
| 736 | if (!st) printf("JUNK (error %s) %s\n", strerror(errno), path); |
| 737 | else printf("JUNK %s %s\n", describefile(st), path); |
| 738 | return (0); |
| 739 | } |
| 740 | |
| 741 | static int verify(int argc, char *argv[]) |
| 742 | { |
| 743 | #define f_bogus 1u |
| 744 | #define f_bin 2u |
| 745 | #define f_ok 4u |
| 746 | #define f_nocheck 8u |
| 747 | |
| 748 | unsigned f = 0; |
| 749 | unsigned verb = 1; |
| 750 | key_file kf; |
| 751 | key *k = 0; |
| 752 | sig *s; |
| 753 | dstr d = DSTR_INIT; |
| 754 | const char *err; |
| 755 | fhashstate fh; |
| 756 | FILE *fp; |
| 757 | block b; |
| 758 | int e; |
| 759 | |
| 760 | /* --- Parse the options --- */ |
| 761 | |
| 762 | for (;;) { |
| 763 | static struct option opts[] = { |
| 764 | { "verbose", 0, 0, 'v' }, |
| 765 | { "progress", 0, 0, 'p' }, |
| 766 | { "quiet", 0, 0, 'q' }, |
| 767 | { "nocheck", 0, 0, 'C' }, |
| 768 | { "junk", 0, 0, 'j' }, |
| 769 | { 0, 0, 0, 0 } |
| 770 | }; |
| 771 | int i = mdwopt(argc, argv, "+vpqCj", opts, 0, 0, 0); |
| 772 | if (i < 0) |
| 773 | break; |
| 774 | switch (i) { |
| 775 | case 'v': |
| 776 | verb++; |
| 777 | break; |
| 778 | case 'p': |
| 779 | f |= FHF_PROGRESS; |
| 780 | break; |
| 781 | case 'q': |
| 782 | if (verb) |
| 783 | verb--; |
| 784 | break; |
| 785 | case 'C': |
| 786 | f |= f_nocheck; |
| 787 | break; |
| 788 | case 'j': |
| 789 | f |= FHF_JUNK; |
| 790 | break; |
| 791 | default: |
| 792 | f |= f_bogus; |
| 793 | break; |
| 794 | } |
| 795 | } |
| 796 | argc -= optind; |
| 797 | argv += optind; |
| 798 | if ((f & f_bogus) || argc > 1) |
| 799 | die(EXIT_FAILURE, "Usage: verify [-qvC] [FILE]"); |
| 800 | |
| 801 | /* --- Open the key file, and start reading the input file --- */ |
| 802 | |
| 803 | if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0)) |
| 804 | die(EXIT_FAILURE, "couldn't open keyring `%s'\n", keyring); |
| 805 | if (argc < 1) |
| 806 | fp = stdin; |
| 807 | else { |
| 808 | if ((fp = fopen(argv[0], "rb")) == 0) { |
| 809 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
| 810 | argv[0], strerror(errno)); |
| 811 | } |
| 812 | if (getc(fp) == 0) { |
| 813 | ungetc(0, fp); |
| 814 | f |= f_bin; |
| 815 | } else { |
| 816 | fclose(fp); |
| 817 | if ((fp = fopen(argv[0], "r")) == 0) { |
| 818 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
| 819 | argv[0], strerror(errno)); |
| 820 | } |
| 821 | } |
| 822 | } |
| 823 | |
| 824 | /* --- Read the introductory matter --- */ |
| 825 | |
| 826 | binit(&b); |
| 827 | for (;;) { |
| 828 | breset(&b); |
| 829 | e = bget(&b, fp, f & f_bin); |
| 830 | if (e < 0) |
| 831 | die(EXIT_FAILURE, "error reading packet: %s", errtab[-e]); |
| 832 | if (e >= T_BEGIN) |
| 833 | break; |
| 834 | switch (e) { |
| 835 | case T_IDENT: |
| 836 | if (verb > 2) |
| 837 | printf("INFO ident: `%s'\n", b.d.buf); |
| 838 | break; |
| 839 | case T_KEYID: |
| 840 | if ((k = key_byid(&kf, b.k)) == 0) { |
| 841 | if (verb) |
| 842 | printf("FAIL key %08lx not found\n", (unsigned long)b.k); |
| 843 | exit(EXIT_FAILURE); |
| 844 | } |
| 845 | if (verb > 2) { |
| 846 | DRESET(&b.d); |
| 847 | key_fulltag(k, &b.d); |
| 848 | printf("INFO key: %s\n", b.d.buf); |
| 849 | } |
| 850 | break; |
| 851 | default: |
| 852 | die(EXIT_FAILURE, "(internal) unknown packet type\n"); |
| 853 | break; |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | /* --- Initialize the hash function and start reading hashed packets --- */ |
| 858 | |
| 859 | if (!k) { |
| 860 | if (verb) |
| 861 | puts("FAIL no keyid packet found"); |
| 862 | exit(EXIT_FAILURE); |
| 863 | } |
| 864 | |
| 865 | s = getsig(k, "dsig", 0); |
| 866 | if (!(f & f_nocheck) && verb && (err = s->ops->check(s)) != 0) |
| 867 | printf("WARN public key fails check: %s", err); |
| 868 | |
| 869 | fhash_init(&fh, GH_CLASS(s->h), f | FHF_BINARY); |
| 870 | for (;;) { |
| 871 | switch (e) { |
| 872 | case T_COMMENT: |
| 873 | if (verb > 1) |
| 874 | printf("INFO comment: `%s'\n", b.d.buf); |
| 875 | bemit(&b, 0, s->h, 0); |
| 876 | break; |
| 877 | case T_DATE: |
| 878 | if (verb > 2) { |
| 879 | DRESET(&b.d); |
| 880 | timestring(b.t, &b.d); |
| 881 | printf("INFO date: %s\n", b.d.buf); |
| 882 | } |
| 883 | bemit(&b, 0, s->h, 0); |
| 884 | break; |
| 885 | case T_EXPIRE: { |
| 886 | time_t now = time(0); |
| 887 | if (b.t != KEXP_FOREVER && b.t < now) { |
| 888 | if (verb > 1) |
| 889 | puts("BAD signature has expired"); |
| 890 | f |= f_bogus; |
| 891 | } |
| 892 | if (verb > 2) { |
| 893 | DRESET(&b.d); |
| 894 | timestring(b.t, &b.d); |
| 895 | printf("INFO expires: %s\n", b.d.buf); |
| 896 | } |
| 897 | bemit(&b, 0, s->h, 0); |
| 898 | } break; |
| 899 | case T_FILE: |
| 900 | DRESET(&d); |
| 901 | DENSURE(&d, GH_CLASS(s->h)->hashsz); |
| 902 | if (fhash(&fh, b.d.buf, d.buf)) { |
| 903 | if (verb > 1) { |
| 904 | printf("BAD error reading file `%s': %s\n", |
| 905 | b.d.buf, strerror(errno)); |
| 906 | } |
| 907 | f |= f_bogus; |
| 908 | } else if (b.b.len != GH_CLASS(s->h)->hashsz || |
| 909 | memcmp(d.buf, b.b.buf, b.b.len) != 0) { |
| 910 | if (verb > 1) |
| 911 | printf("BAD file `%s' has incorrect hash\n", b.d.buf); |
| 912 | f |= f_bogus; |
| 913 | } else if (verb > 3) { |
| 914 | fputs("INFO hash: ", stdout); |
| 915 | fhex(stdout, b.b.buf, b.b.len); |
| 916 | printf(" %s\n", b.d.buf); |
| 917 | } |
| 918 | bemit(&b, 0, s->h, 0); |
| 919 | break; |
| 920 | case T_SIGNATURE: |
| 921 | if (s->ops->doit(s, &b.b)) { |
| 922 | if (verb > 1) |
| 923 | puts("BAD bad signature"); |
| 924 | f |= f_bogus; |
| 925 | } else if (verb > 2) |
| 926 | puts("INFO good signature"); |
| 927 | goto done; |
| 928 | default: |
| 929 | if (verb) |
| 930 | printf("FAIL invalid packet type %i\n", e); |
| 931 | exit(EXIT_FAILURE); |
| 932 | break; |
| 933 | } |
| 934 | breset(&b); |
| 935 | e = bget(&b, fp, f & f_bin); |
| 936 | if (e < 0) { |
| 937 | if (verb) |
| 938 | printf("FAIL error reading packet: %s\n", errtab[-e]); |
| 939 | exit(EXIT_FAILURE); |
| 940 | } |
| 941 | } |
| 942 | done: |
| 943 | if ((f & FHF_JUNK) && fhash_junk(&fh, checkjunk, 0)) |
| 944 | f |= f_bogus; |
| 945 | fhash_free(&fh); |
| 946 | bdestroy(&b); |
| 947 | dstr_destroy(&d); |
| 948 | freesig(s); |
| 949 | key_close(&kf); |
| 950 | if (fp != stdin) |
| 951 | fclose(fp); |
| 952 | if (verb) { |
| 953 | if (f & f_bogus) |
| 954 | puts("FAIL signature invalid"); |
| 955 | else |
| 956 | puts("OK signature verified"); |
| 957 | } |
| 958 | return (f & f_bogus ? EXIT_FAILURE : EXIT_SUCCESS); |
| 959 | |
| 960 | #undef f_bogus |
| 961 | #undef f_bin |
| 962 | #undef f_ok |
| 963 | #undef f_nocheck |
| 964 | } |
| 965 | |
| 966 | /*----- Main code ---------------------------------------------------------*/ |
| 967 | |
| 968 | #define LISTS(LI) \ |
| 969 | LI("Lists", list, \ |
| 970 | listtab[i].name, listtab[i].name) \ |
| 971 | LI("Signature schemes", sig, \ |
| 972 | sigtab[i].name, sigtab[i].name) \ |
| 973 | LI("Hash functions", hash, \ |
| 974 | ghashtab[i], ghashtab[i]->name) |
| 975 | |
| 976 | MAKELISTTAB(listtab, LISTS) |
| 977 | |
| 978 | int cmd_show(int argc, char *argv[]) |
| 979 | { |
| 980 | return (displaylists(listtab, argv + 1)); |
| 981 | } |
| 982 | |
| 983 | static int cmd_help(int, char **); |
| 984 | |
| 985 | static cmd cmdtab[] = { |
| 986 | { "help", cmd_help, "help [COMMAND...]" }, |
| 987 | { "show", cmd_show, "show [ITEM...]" }, |
| 988 | { "sign", sign, |
| 989 | "sign [-0bpqvC] [-c COMMENT] [-k TAG] [-e EXPIRE]\n\t\ |
| 990 | [-f FILE] [-h FILE] [-o OUTPUT]", |
| 991 | "\ |
| 992 | Options:\n\ |
| 993 | \n\ |
| 994 | -0, --null Read null-terminated filenames from stdin.\n\ |
| 995 | -b, --binary Produce a binary output file.\n\ |
| 996 | -q, --quiet Produce fewer messages while working.\n\ |
| 997 | -v, --verbose Produce more messages while working.\n\ |
| 998 | -p, --progress Show progress on large files.\n\ |
| 999 | -C, --nocheck Don't check the private key.\n\ |
| 1000 | -c, --comment=COMMENT Include COMMENT in the output file.\n\ |
| 1001 | -f, --file=FILE Read filenames to hash from FILE.\n\ |
| 1002 | -h, --hashes=FILE Read precomputed hashes from FILE.\n\ |
| 1003 | -o, --output=FILE Write the signed result to FILE.\n\ |
| 1004 | -k, --key=TAG Use a key named by TAG.\n\ |
| 1005 | -e, --expire=TIME The signature should expire after TIME.\n\ |
| 1006 | " }, |
| 1007 | { "verify", verify, |
| 1008 | "verify [-pqvC] [FILE]", "\ |
| 1009 | Options:\n\ |
| 1010 | \n\ |
| 1011 | -q, --quiet Produce fewer messages while working.\n\ |
| 1012 | -v, --verbose Produce more messages while working.\n\ |
| 1013 | -p, --progress Show progress on large files.\n\ |
| 1014 | -C, --nocheck Don't check the public key.\n\ |
| 1015 | " }, |
| 1016 | { 0, 0, 0 } |
| 1017 | }; |
| 1018 | |
| 1019 | static int cmd_help(int argc, char **argv) |
| 1020 | { |
| 1021 | sc_help(cmdtab, stdout, argv + 1); |
| 1022 | return (0); |
| 1023 | } |
| 1024 | |
| 1025 | void version(FILE *fp) |
| 1026 | { |
| 1027 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
| 1028 | } |
| 1029 | |
| 1030 | static void usage(FILE *fp) |
| 1031 | { |
| 1032 | pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n"); |
| 1033 | } |
| 1034 | |
| 1035 | void help_global(FILE *fp) |
| 1036 | { |
| 1037 | usage(fp); |
| 1038 | fputs("\n\ |
| 1039 | Create and verify signatures on lists of files.\n\ |
| 1040 | \n\ |
| 1041 | Global command-line options:\n\ |
| 1042 | \n\ |
| 1043 | -h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\ |
| 1044 | -v, --version Show program version number.\n\ |
| 1045 | -u, --usage Show a terse usage message.\n\ |
| 1046 | \n\ |
| 1047 | -k, --keyring=FILE Read keys from FILE.\n", |
| 1048 | fp); |
| 1049 | } |
| 1050 | |
| 1051 | /* --- @main@ --- * |
| 1052 | * |
| 1053 | * Arguments: @int argc@ = number of command line arguments |
| 1054 | * @char *argv[]@ = vector of command line arguments |
| 1055 | * |
| 1056 | * Returns: Zero if successful, nonzero otherwise. |
| 1057 | * |
| 1058 | * Use: Signs or verifies signatures on lists of files. Useful for |
| 1059 | * ensuring that a distribution is unmolested. |
| 1060 | */ |
| 1061 | |
| 1062 | int main(int argc, char *argv[]) |
| 1063 | { |
| 1064 | unsigned f = 0; |
| 1065 | |
| 1066 | #define f_bogus 1u |
| 1067 | |
| 1068 | /* --- Initialize the library --- */ |
| 1069 | |
| 1070 | ego(argv[0]); |
| 1071 | sub_init(); |
| 1072 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
| 1073 | rand_seed(RAND_GLOBAL, 160); |
| 1074 | |
| 1075 | /* --- Parse options --- */ |
| 1076 | |
| 1077 | for (;;) { |
| 1078 | static struct option opts[] = { |
| 1079 | { "help", 0, 0, 'h' }, |
| 1080 | { "version", 0, 0, 'v' }, |
| 1081 | { "usage", 0, 0, 'u' }, |
| 1082 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
| 1083 | { 0, 0, 0, 0 } |
| 1084 | }; |
| 1085 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
| 1086 | if (i < 0) |
| 1087 | break; |
| 1088 | switch (i) { |
| 1089 | case 'h': |
| 1090 | sc_help(cmdtab, stdout, argv + optind); |
| 1091 | exit(0); |
| 1092 | break; |
| 1093 | case 'v': |
| 1094 | version(stdout); |
| 1095 | exit(0); |
| 1096 | break; |
| 1097 | case 'u': |
| 1098 | usage(stdout); |
| 1099 | exit(0); |
| 1100 | case 'k': |
| 1101 | keyring = optarg; |
| 1102 | break; |
| 1103 | default: |
| 1104 | f |= f_bogus; |
| 1105 | break; |
| 1106 | } |
| 1107 | } |
| 1108 | |
| 1109 | argc -= optind; |
| 1110 | argv += optind; |
| 1111 | optind = 0; |
| 1112 | if (f & f_bogus || argc < 1) { |
| 1113 | usage(stderr); |
| 1114 | exit(EXIT_FAILURE); |
| 1115 | } |
| 1116 | |
| 1117 | /* --- Dispatch to the correct subcommand handler --- */ |
| 1118 | |
| 1119 | return (findcmd(cmdtab, argv[0])->cmd(argc, argv)); |
| 1120 | |
| 1121 | #undef f_bogus |
| 1122 | } |
| 1123 | |
| 1124 | /*----- That's all, folks -------------------------------------------------*/ |