4bedc99b |
1 | /* -*-c-*- |
2 | * |
5c3f75ec |
3 | * $Id: dsig.c,v 1.12 2004/04/17 09:58:37 mdw Exp $ |
4bedc99b |
4 | * |
5 | * Verify signatures on distribuitions of files |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
4bedc99b |
30 | /*----- Header files ------------------------------------------------------*/ |
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 | |
4bedc99b |
47 | #include "getdate.h" |
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48 | #include "rand.h" |
4bedc99b |
49 | #include "ghash.h" |
50 | #include "key.h" |
51 | #include "key-data.h" |
4bedc99b |
52 | #include "noise.h" |
5c3f75ec |
53 | #include "cc.h" |
4bedc99b |
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 */ |
4bedc99b |
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[] = { |
4e6e0188 |
87 | "ident:", "keyid:", |
4bedc99b |
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 | /* --- @getstring@ --- * |
112 | * |
113 | * Arguments: @FILE *fp@ = stream from which to read |
114 | * @dstr *d@ = destination string |
115 | * @unsigned raw@ = raw or cooked read |
116 | * |
117 | * Returns: Zero if OK, nonzero on end-of-file. |
118 | * |
119 | * Use: Reads a filename (or something similar) from a stream. |
120 | */ |
121 | |
122 | static int getstring(FILE *fp, dstr *d, unsigned raw) |
123 | { |
124 | int ch; |
125 | int q = 0; |
126 | |
127 | /* --- Raw: just read exactly what's written up to a null byte --- */ |
128 | |
129 | if (raw) { |
130 | if ((ch = getc(fp)) == EOF) |
131 | return (EOF); |
132 | for (;;) { |
133 | if (!ch) |
134 | break; |
135 | DPUTC(d, ch); |
136 | if ((ch = getc(fp)) == EOF) |
137 | break; |
138 | } |
139 | DPUTZ(d); |
140 | return (0); |
141 | } |
142 | |
143 | /* --- Skip as far as whitespace --- * |
144 | * |
145 | * Also skip past comments. |
146 | */ |
147 | |
148 | again: |
149 | ch = getc(fp); |
d470270a |
150 | while (isspace(ch)) |
4bedc99b |
151 | ch = getc(fp); |
152 | if (ch == '#') { |
153 | do ch = getc(fp); while (ch != '\n' && ch != EOF); |
154 | goto again; |
155 | } |
156 | if (ch == EOF) |
157 | return (EOF); |
158 | |
159 | /* --- If the character is a quote then read a quoted string --- */ |
160 | |
161 | switch (ch) { |
162 | case '`': |
163 | ch = '\''; |
164 | case '\'': |
165 | case '\"': |
166 | q = ch; |
167 | ch = getc(fp); |
168 | break; |
169 | } |
170 | |
171 | /* --- Now read all sorts of interesting things --- */ |
172 | |
173 | for (;;) { |
174 | |
175 | /* --- Handle an escaped thing --- */ |
176 | |
177 | if (ch == '\\') { |
178 | ch = getc(fp); |
179 | if (ch == EOF) |
180 | break; |
181 | switch (ch) { |
365c07f5 |
182 | case 'a': ch = '\a'; break; |
4bedc99b |
183 | case 'b': ch = '\b'; break; |
184 | case 'f': ch = '\f'; break; |
185 | case 'n': ch = '\n'; break; |
186 | case 'r': ch = '\r'; break; |
187 | case 't': ch = '\t'; break; |
188 | case 'v': ch = '\v'; break; |
189 | } |
190 | DPUTC(d, ch); |
365c07f5 |
191 | ch = getc(fp); |
4bedc99b |
192 | continue; |
193 | } |
194 | |
195 | /* --- If it's a quote or some other end marker then stop --- */ |
196 | |
197 | if (ch == q || (!q && isspace((unsigned char)ch))) |
198 | break; |
199 | |
200 | /* --- Otherwise contribute and continue --- */ |
201 | |
202 | DPUTC(d, ch); |
203 | if ((ch = getc(fp)) == EOF) |
204 | break; |
205 | } |
206 | |
207 | /* --- Done --- */ |
208 | |
209 | DPUTZ(d); |
210 | return (0); |
211 | } |
212 | |
213 | /* --- @putstring@ --- * |
214 | * |
215 | * Arguments: @FILE *fp@ = stream to write on |
216 | * @const char *p@ = pointer to text |
217 | * @unsigned raw@ = whether the string is to be written raw |
218 | * |
219 | * Returns: --- |
220 | * |
221 | * Use: Emits a string to a stream. |
222 | */ |
223 | |
224 | static void putstring(FILE *fp, const char *p, unsigned raw) |
225 | { |
226 | size_t sz = strlen(p); |
227 | unsigned qq; |
228 | const char *q; |
229 | |
230 | /* --- Just write the string null terminated if raw --- */ |
231 | |
232 | if (raw) { |
233 | fwrite(p, 1, sz + 1, fp); |
234 | return; |
235 | } |
236 | |
237 | /* --- Check for any dodgy characters --- */ |
238 | |
239 | qq = 0; |
240 | for (q = p; *q; q++) { |
241 | if (isspace((unsigned char)*q)) { |
242 | qq = '\"'; |
243 | break; |
244 | } |
245 | } |
246 | |
247 | if (qq) |
248 | putc(qq, fp); |
249 | |
250 | /* --- Emit the string --- */ |
251 | |
252 | for (q = p; *q; q++) { |
253 | switch (*q) { |
254 | case '\a': fputc('\\', fp); fputc('a', fp); break; |
255 | case '\b': fputc('\\', fp); fputc('b', fp); break; |
256 | case '\f': fputc('\\', fp); fputc('f', fp); break; |
257 | case '\n': fputc('\\', fp); fputc('n', fp); break; |
258 | case '\r': fputc('\\', fp); fputc('r', fp); break; |
259 | case '\t': fputc('\\', fp); fputc('t', fp); break; |
260 | case '\v': fputc('\\', fp); fputc('v', fp); break; |
261 | case '`': fputc('\\', fp); fputc('`', fp); break; |
262 | case '\'': fputc('\\', fp); fputc('\'', fp); break; |
263 | case '\"': fputc('\\', fp); fputc('\"', fp); break; |
264 | default: |
265 | putc(*q, fp); |
266 | break; |
267 | } |
268 | } |
269 | |
270 | /* --- Done --- */ |
271 | |
272 | if (qq) |
273 | putc(qq, fp); |
274 | } |
275 | |
276 | /* --- @timestring@ --- * |
277 | * |
278 | * Arguments: @time_t t@ = a timestamp |
279 | * @dstr *d@ = a string to write on |
280 | * |
281 | * Returns: --- |
282 | * |
283 | * Use: Writes a textual representation of the timestamp to the |
284 | * string. |
285 | */ |
286 | |
287 | static void timestring(time_t t, dstr *d) |
288 | { |
289 | if (t == KEXP_FOREVER) |
290 | DPUTS(d, "forever"); |
291 | else { |
292 | struct tm *tm = localtime(&t); |
293 | DENSURE(d, 32); |
294 | d->len += strftime(d->buf + d->len, 32, "%Y-%m-%d %H:%M:%S %Z", tm); |
295 | DPUTZ(d); |
296 | } |
297 | } |
298 | |
299 | /* --- @breset@ --- * |
300 | * |
301 | * Arguments: @block *b@ = block to reset |
302 | * |
303 | * Returns: --- |
304 | * |
305 | * Use: Resets a block so that more stuff can be put in it. |
306 | */ |
307 | |
308 | static void breset(block *b) |
309 | { |
310 | b->tag = 0; |
311 | DRESET(&b->d); |
312 | DRESET(&b->b); |
313 | b->k = 0; |
314 | b->t = KEXP_EXPIRE; |
315 | } |
316 | |
317 | /* --- @binit@ --- * |
318 | * |
319 | * Arguments: @block *b@ = block to initialize |
320 | * |
321 | * Returns: --- |
322 | * |
323 | * Use: Initializes a block as something to read into. |
324 | */ |
325 | |
326 | static void binit(block *b) |
327 | { |
328 | dstr_create(&b->d); |
329 | dstr_create(&b->b); |
330 | breset(b); |
331 | } |
332 | |
333 | /* --- @bdestroy@ --- * |
334 | * |
335 | * Arguments: @block *b@ = block to destroy |
336 | * |
337 | * Returns: --- |
338 | * |
339 | * Use: Destroys a block's contents. |
340 | */ |
341 | |
342 | static void bdestroy(block *b) |
343 | { |
344 | dstr_destroy(&b->d); |
345 | dstr_destroy(&b->b); |
346 | } |
347 | |
348 | /* --- @bget@ --- * |
349 | * |
350 | * Arguments: @block *b@ = pointer to block |
351 | * @FILE *fp@ = stream to read from |
352 | * @unsigned bin@ = binary switch |
353 | * |
354 | * Returns: Tag of block, or an error tag. |
355 | * |
356 | * Use: Reads a block from a stream. |
357 | */ |
358 | |
359 | static int bget(block *b, FILE *fp, unsigned bin) |
360 | { |
361 | int tag; |
362 | |
363 | /* --- Read the tag --- */ |
364 | |
365 | if (bin) |
366 | tag = getc(fp); |
367 | else { |
368 | dstr d = DSTR_INIT; |
369 | if (getstring(fp, &d, 0)) |
370 | return (E_EOF); |
371 | for (tag = 0; tagtab[tag]; tag++) { |
372 | if (strcmp(tagtab[tag], d.buf) == 0) |
373 | goto done; |
374 | } |
375 | return (E_TAG); |
376 | done:; |
377 | } |
378 | |
379 | /* --- Decide what to do next --- */ |
380 | |
381 | breset(b); |
382 | b->tag = tag; |
383 | switch (tag) { |
384 | |
385 | /* --- Reading of strings --- */ |
386 | |
387 | case T_IDENT: |
388 | case T_COMMENT: |
4bedc99b |
389 | if (getstring(fp, &b->d, bin)) |
390 | return (E_EOF); |
391 | break; |
392 | |
393 | /* --- Timestamps --- */ |
394 | |
395 | case T_DATE: |
396 | case T_EXPIRE: |
397 | if (bin) { |
398 | octet buf[8]; |
399 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
400 | return (E_EOF); |
401 | b->t = ((time_t)(((LOAD32(buf + 0) << 16) << 16) & ~MASK32) | |
402 | (time_t)LOAD32(buf + 4)); |
403 | } else { |
404 | if (getstring(fp, &b->d, 0)) |
405 | return (E_EOF); |
406 | if (strcmp(b->d.buf, "forever") == 0) |
407 | b->t = KEXP_FOREVER; |
408 | else if ((b->t = get_date(b->d.buf, 0)) == -1) |
409 | return (E_DATE); |
410 | } |
411 | break; |
412 | |
413 | /* --- Key ids --- */ |
414 | |
415 | case T_KEYID: |
416 | if (bin) { |
417 | octet buf[4]; |
418 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
419 | return (E_EOF); |
420 | b->k = LOAD32(buf); |
421 | } else { |
422 | if (getstring(fp, &b->d, 0)) |
423 | return (E_EOF); |
424 | b->k = strtoul(b->d.buf, 0, 16); |
425 | } |
426 | break; |
427 | |
428 | /* --- Reading of binary data --- */ |
429 | |
430 | case T_FILE: |
431 | case T_SIGNATURE: |
432 | if (bin) { |
433 | octet buf[2]; |
434 | uint32 sz; |
435 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
436 | return (E_EOF); |
437 | sz = LOAD16(buf); |
438 | if (sz > 4096) |
439 | return (E_BIN); |
440 | DENSURE(&b->b, sz); |
441 | if (fread(b->b.buf + b->b.len, 1, sz, fp) < sz) |
442 | return (E_EOF); |
443 | b->b.len += sz; |
444 | } else { |
445 | base64_ctx b64; |
446 | if (getstring(fp, &b->d, 0)) |
447 | return (E_EOF); |
448 | base64_init(&b64); |
449 | base64_decode(&b64, b->d.buf, b->d.len, &b->b); |
450 | base64_decode(&b64, 0, 0, &b->b); |
451 | DRESET(&b->d); |
452 | } |
453 | if (tag == T_FILE && getstring(fp, &b->d, bin)) |
454 | return (E_EOF); |
455 | break; |
456 | |
457 | /* --- Anything else --- */ |
458 | |
459 | default: |
460 | return (E_TAG); |
461 | } |
462 | |
463 | return (tag); |
464 | } |
465 | |
466 | /* --- @blob@ --- * |
467 | * |
468 | * Arguments: @block *b@ = pointer to block to emit |
469 | * @dstr *d@ = output buffer |
470 | * |
471 | * Returns: --- |
472 | * |
473 | * Use: Encodes a block in a binary format. |
474 | */ |
475 | |
476 | static void blob(block *b, dstr *d) |
477 | { |
478 | DPUTC(d, b->tag); |
479 | switch (b->tag) { |
480 | case T_IDENT: |
4bedc99b |
481 | case T_COMMENT: |
482 | DPUTD(d, &b->d); |
483 | DPUTC(d, 0); |
484 | break; |
485 | case T_DATE: |
486 | case T_EXPIRE: |
487 | DENSURE(d, 8); |
488 | STORE32(d->buf + d->len, ((b->t & ~MASK32) >> 16) >> 16); |
489 | STORE32(d->buf + d->len + 4, b->t); |
490 | d->len += 8; |
491 | break; |
492 | case T_KEYID: |
493 | DENSURE(d, 4); |
494 | STORE32(d->buf + d->len, b->k); |
495 | d->len += 4; |
496 | break; |
497 | case T_FILE: |
498 | case T_SIGNATURE: |
499 | DENSURE(d, 2); |
500 | STORE16(d->buf + d->len, b->b.len); |
501 | d->len += 2; |
502 | DPUTD(d, &b->b); |
503 | if (b->tag == T_FILE) { |
504 | DPUTD(d, &b->d); |
505 | DPUTC(d, 0); |
506 | } |
507 | break; |
508 | } |
509 | } |
510 | |
511 | /* --- @bwrite@ --- * |
512 | * |
513 | * Arguments: @block *b@ = pointer to block to write |
514 | * @FILE *fp@ = stream to write on |
515 | * |
516 | * Returns: --- |
517 | * |
518 | * Use: Writes a block on a stream in a textual format. |
519 | */ |
520 | |
521 | static void bwrite(block *b, FILE *fp) |
522 | { |
523 | fputs(tagtab[b->tag], fp); |
524 | putc(' ', fp); |
525 | switch (b->tag) { |
526 | case T_IDENT: |
4bedc99b |
527 | case T_COMMENT: |
528 | putstring(fp, b->d.buf, 0); |
529 | break; |
530 | case T_DATE: |
531 | case T_EXPIRE: { |
532 | dstr d = DSTR_INIT; |
533 | timestring(b->t, &d); |
534 | putstring(fp, d.buf, 0); |
535 | dstr_destroy(&d); |
536 | } break; |
537 | case T_KEYID: |
538 | fprintf(fp, "%08lx", (unsigned long)b->k); |
539 | break; |
540 | case T_FILE: |
541 | case T_SIGNATURE: { |
542 | dstr d = DSTR_INIT; |
543 | base64_ctx b64; |
544 | base64_init(&b64); |
545 | b64.maxline = 0; |
546 | base64_encode(&b64, b->b.buf, b->b.len, &d); |
547 | base64_encode(&b64, 0, 0, &d); |
548 | dstr_write(&d, fp); |
549 | if (b->tag == T_FILE) { |
550 | putc(' ', fp); |
551 | putstring(fp, b->d.buf, 0); |
552 | } |
553 | } break; |
554 | } |
555 | putc('\n', fp); |
556 | } |
557 | |
558 | /* --- @bemit@ --- * |
559 | * |
560 | * Arguments: @block *b@ = pointer to block to write |
561 | * @FILE *fp@ = file to write on |
562 | * @ghash *h@ = pointer to hash function |
563 | * @unsigned bin@ = binary/text flag |
564 | * |
565 | * Returns: --- |
566 | * |
567 | * Use: Spits out a block properly. |
568 | */ |
569 | |
570 | static void bemit(block *b, FILE *fp, ghash *h, unsigned bin) |
571 | { |
572 | if (h || (fp && bin)) { |
573 | dstr d = DSTR_INIT; |
574 | blob(b, &d); |
575 | if (h) |
4e6e0188 |
576 | GH_HASH(h, d.buf, d.len); |
4bedc99b |
577 | if (fp && bin) |
578 | fwrite(d.buf, d.len, 1, fp); |
579 | } |
580 | if (fp && !bin) |
581 | bwrite(b, fp); |
582 | } |
583 | |
584 | /*----- Static variables --------------------------------------------------*/ |
585 | |
586 | static const char *keyring = "keyring"; |
587 | |
588 | /*----- Other shared functions --------------------------------------------*/ |
589 | |
590 | /* --- @keyreport@ --- * |
591 | * |
592 | * Arguments: @const char *file@ = filename containing the error |
593 | * @int line@ = line number in file |
594 | * @const char *err@ = error text message |
595 | * @void *p@ = unimportant pointer |
596 | * |
597 | * Returns: --- |
598 | * |
599 | * Use: Reports errors during the opening of a key file. |
600 | */ |
601 | |
602 | static void keyreport(const char *file, int line, const char *err, void *p) |
603 | { |
604 | moan("error in keyring `%s' at line `%s': %s", file, line, err); |
605 | } |
606 | |
607 | /* --- @fhash@ --- * |
608 | * |
609 | * Arguments: @const gchash *c@ = pointer to hash class |
610 | * @const char *file@ = file to hash |
e45700eb |
611 | * @void *b@ = pointer to output buffer |
4bedc99b |
612 | * |
613 | * Returns: Zero if it worked, or nonzero for a system error. |
614 | * |
615 | * Use: Hashes a file. |
616 | */ |
617 | |
e45700eb |
618 | static int fhash(const gchash *c, const char *file, void *b) |
4bedc99b |
619 | { |
620 | FILE *fp = fopen(file, "rb"); |
4e6e0188 |
621 | ghash *h = GH_INIT(c); |
4bedc99b |
622 | char buf[4096]; |
623 | size_t sz; |
624 | int rc = 0; |
625 | |
626 | if (!fp) |
627 | return (-1); |
628 | while ((sz = fread(buf, 1, sizeof(buf), fp)) > 0) |
4e6e0188 |
629 | GH_HASH(h, buf, sz); |
4bedc99b |
630 | if (ferror(fp)) |
631 | rc = -1; |
4e6e0188 |
632 | GH_DONE(h, b); |
633 | GH_DESTROY(h); |
4bedc99b |
634 | fclose(fp); |
635 | return (rc); |
636 | } |
637 | |
638 | /* --- @fhex@ --- * |
639 | * |
640 | * Arguments: @FILE *fp@ = file to write on |
641 | * @const void *p@ = pointer to data to be written |
642 | * @size_t sz@ = size of the data to write |
643 | * |
644 | * Returns: --- |
645 | * |
646 | * Use: Emits a hex dump to a stream. |
647 | */ |
648 | |
649 | static void fhex(FILE *fp, const void *p, size_t sz) |
650 | { |
651 | const octet *q = p; |
652 | if (!sz) |
653 | return; |
654 | for (;;) { |
655 | fprintf(fp, "%02x", *q++); |
656 | sz--; |
657 | if (!sz) |
658 | break; |
4bedc99b |
659 | } |
660 | } |
661 | |
662 | /*----- Signature generation ----------------------------------------------*/ |
663 | |
664 | static int sign(int argc, char *argv[]) |
665 | { |
16efd15b |
666 | #define f_raw 1u |
667 | #define f_bin 2u |
668 | #define f_bogus 4u |
4bedc99b |
669 | |
670 | unsigned f = 0; |
4e6e0188 |
671 | const char *ki = "dsig"; |
4bedc99b |
672 | key_file kf; |
673 | key *k; |
4e6e0188 |
674 | sig *s; |
4bedc99b |
675 | time_t exp = KEXP_EXPIRE; |
676 | unsigned verb = 0; |
677 | const char *ifile = 0; |
678 | const char *ofile = 0; |
679 | const char *c = 0; |
5c3f75ec |
680 | const char *err; |
4bedc99b |
681 | FILE *ifp, *ofp; |
682 | dstr d = DSTR_INIT; |
683 | block b; |
684 | int e; |
685 | |
686 | for (;;) { |
687 | static struct option opts[] = { |
688 | { "null", 0, 0, '0' }, |
689 | { "binary", 0, 0, 'b' }, |
690 | { "verbose", 0, 0, 'v' }, |
691 | { "quiet", 0, 0, 'q' }, |
4bedc99b |
692 | { "comment", OPTF_ARGREQ, 0, 'c' }, |
693 | { "file", OPTF_ARGREQ, 0, 'f' }, |
694 | { "output", OPTF_ARGREQ, 0, 'o' }, |
4e6e0188 |
695 | { "key", OPTF_ARGREQ, 0, 'k' }, |
4bedc99b |
696 | { "expire", OPTF_ARGREQ, 0, 'e' }, |
697 | { 0, 0, 0, 0 } |
698 | }; |
5c3f75ec |
699 | int i = mdwopt(argc, argv, "+0vqb" "c:" "f:o:" "k:e:", opts, 0, 0, 0); |
4bedc99b |
700 | if (i < 0) |
701 | break; |
702 | switch (i) { |
703 | case '0': |
704 | f |= f_raw; |
705 | break; |
706 | case 'b': |
707 | f |= f_bin; |
708 | break; |
709 | case 'v': |
710 | verb++; |
711 | break; |
712 | case 'q': |
713 | if (verb > 0) |
714 | verb--; |
715 | break; |
4bedc99b |
716 | case 'c': |
717 | c = optarg; |
718 | break; |
719 | case 'f': |
720 | ifile = optarg; |
721 | break; |
722 | case 'o': |
723 | ofile = optarg; |
724 | break; |
4bedc99b |
725 | case 'k': |
726 | ki = optarg; |
727 | break; |
728 | case 'e': |
729 | if (strcmp(optarg, "forever") == 0) |
730 | exp = KEXP_FOREVER; |
731 | else if ((exp = get_date(optarg, 0)) == -1) |
732 | die(EXIT_FAILURE, "bad expiry time"); |
733 | break; |
734 | default: |
735 | f |= f_bogus; |
736 | break; |
737 | } |
738 | } |
739 | if (optind != argc || (f & f_bogus)) |
740 | die(EXIT_FAILURE, "Usage: sign [-options]"); |
741 | |
742 | /* --- Locate the signing key --- */ |
743 | |
744 | if (key_open(&kf, keyring, KOPEN_WRITE, keyreport, 0)) |
745 | die(EXIT_FAILURE, "couldn't open keyring `%s'", keyring); |
4e6e0188 |
746 | if ((k = key_bytag(&kf, ki)) == 0) |
747 | die(EXIT_FAILURE, "couldn't find key `%s'", ki); |
4bedc99b |
748 | key_fulltag(k, &d); |
749 | if (exp == KEXP_FOREVER && k->exp != KEXP_FOREVER) { |
750 | die(EXIT_FAILURE, "key `%s' expires: can't create nonexpiring signature", |
751 | d.buf); |
752 | } |
5c3f75ec |
753 | s = getsig(k, "dsig", 1); |
754 | |
755 | /* --- Check the key --- */ |
756 | |
757 | if ((err = s->ops->check(s)) != 0) |
758 | moan("key `%s' fails check: %s", d.buf, err); |
4bedc99b |
759 | |
760 | /* --- Open files --- */ |
761 | |
762 | if (!ifile) |
763 | ifp = stdin; |
764 | else if ((ifp = fopen(ifile, (f & f_raw) ? "rb" : "r")) == 0) { |
765 | die(EXIT_FAILURE, "couldn't open input file `%s': %s", |
766 | ifile, strerror(errno)); |
767 | } |
768 | |
769 | if (!ofile) |
770 | ofp = stdout; |
771 | else if ((ofp = fopen(ofile, (f & f_bin) ? "wb" : "w")) == 0) { |
772 | die(EXIT_FAILURE, "couldn't open output file `%s': %s", |
773 | ofile, strerror(errno)); |
774 | } |
775 | |
776 | /* --- Emit the start of the output --- */ |
777 | |
778 | binit(&b); b.tag = T_IDENT; |
779 | dstr_putf(&b.d, "%s, Catacomb version " VERSION, QUIS); |
780 | bemit(&b, ofp, 0, f & f_bin); |
781 | |
4bedc99b |
782 | breset(&b); b.tag = T_KEYID; b.k = k->id; |
4e6e0188 |
783 | bemit(&b, ofp, 0, f & f_bin); |
4bedc99b |
784 | |
785 | /* --- Start hashing, and emit the datestamps and things --- */ |
786 | |
787 | { |
788 | time_t now = time(0); |
789 | |
4e6e0188 |
790 | breset(&b); b.tag = T_DATE; b.t = now; bemit(&b, ofp, s->h, f & f_bin); |
4bedc99b |
791 | if (exp == KEXP_EXPIRE) |
792 | exp = now + 86400 * 28; |
4e6e0188 |
793 | breset(&b); b.tag = T_EXPIRE; b.t = exp; bemit(&b, ofp, s->h, f & f_bin); |
4bedc99b |
794 | if (c) { |
795 | breset(&b); b.tag = T_COMMENT; DPUTS(&b.d, c); |
4e6e0188 |
796 | bemit(&b, ofp, s->h, f & f_bin); |
4bedc99b |
797 | } |
798 | |
799 | if (!(f & f_bin)) |
800 | putc('\n', ofp); |
801 | } |
802 | |
803 | /* --- Now hash the various files --- */ |
804 | |
805 | for (;;) { |
806 | |
807 | /* --- Stop on an output error --- */ |
808 | |
809 | if (ferror(ofp)) { |
810 | f |= f_bogus; |
811 | break; |
812 | } |
813 | |
814 | /* --- Read the next filename to hash --- */ |
815 | |
816 | breset(&b); |
817 | if (getstring(ifp, &b.d, f & f_raw)) |
818 | break; |
819 | b.tag = T_FILE; |
4e6e0188 |
820 | DENSURE(&b.b, GH_CLASS(s->h)->hashsz); |
821 | if (fhash(GH_CLASS(s->h), b.d.buf, b.b.buf)) { |
4bedc99b |
822 | moan("Error reading `%s': %s", b.d.buf, strerror(errno)); |
823 | f |= f_bogus; |
824 | } else { |
4e6e0188 |
825 | b.b.len += GH_CLASS(s->h)->hashsz; |
4bedc99b |
826 | if (verb) { |
827 | fhex(stderr, b.b.buf, b.b.len); |
828 | fprintf(stderr, " %s\n", b.d.buf); |
829 | } |
4e6e0188 |
830 | bemit(&b, ofp, s->h, f & f_bin); |
4bedc99b |
831 | } |
832 | } |
833 | |
834 | /* --- Create the signature --- */ |
835 | |
836 | if (!(f & f_bogus)) { |
837 | breset(&b); |
838 | b.tag = T_SIGNATURE; |
4e6e0188 |
839 | if ((e = s->ops->doit(s, &b.b)) != 0) { |
4bedc99b |
840 | moan("error creating signature: %s", key_strerror(e)); |
841 | f |= f_bogus; |
842 | } |
843 | if (!(f & f_bogus)) { |
844 | bemit(&b, ofp, 0, f & f_bin); |
845 | key_used(&kf, k, exp); |
846 | } |
847 | } |
848 | |
849 | /* --- Tidy up at the end --- */ |
850 | |
4e6e0188 |
851 | freesig(s); |
4bedc99b |
852 | bdestroy(&b); |
853 | if (ifile) |
854 | fclose(ifp); |
855 | if (ofile) { |
856 | if (fclose(ofp)) |
857 | f |= f_bogus; |
858 | } else { |
859 | if (fflush(ofp)) |
860 | f |= f_bogus; |
861 | } |
862 | if ((e = key_close(&kf)) != 0) { |
863 | switch (e) { |
864 | case KWRITE_FAIL: |
865 | die(EXIT_FAILURE, "couldn't write file `%s': %s", |
866 | keyring, strerror(errno)); |
867 | case KWRITE_BROKEN: |
868 | die(EXIT_FAILURE, "keyring file `%s' broken: %s (repair manually)", |
869 | keyring, strerror(errno)); |
870 | } |
871 | } |
872 | if (f & f_bogus) |
873 | die(EXIT_FAILURE, "error(s) occurred while creating signature"); |
874 | return (EXIT_SUCCESS); |
16efd15b |
875 | |
876 | #undef f_raw |
877 | #undef f_bin |
878 | #undef f_bogus |
4bedc99b |
879 | } |
880 | |
881 | /*----- Signature verification --------------------------------------------*/ |
882 | |
883 | static int verify(int argc, char *argv[]) |
884 | { |
16efd15b |
885 | #define f_bogus 1u |
886 | #define f_bin 2u |
887 | #define f_ok 4u |
4bedc99b |
888 | |
889 | unsigned f = 0; |
890 | unsigned verb = 1; |
891 | key_file kf; |
892 | key *k = 0; |
4e6e0188 |
893 | sig *s; |
4bedc99b |
894 | dstr d = DSTR_INIT; |
5c3f75ec |
895 | const char *err; |
4bedc99b |
896 | FILE *fp; |
897 | block b; |
898 | int e; |
899 | |
900 | /* --- Parse the options --- */ |
901 | |
902 | for (;;) { |
903 | static struct option opts[] = { |
904 | { "verbose", 0, 0, 'v' }, |
905 | { "quiet", 0, 0, 'q' }, |
906 | { 0, 0, 0, 0 } |
907 | }; |
908 | int i = mdwopt(argc, argv, "+vq", opts, 0, 0, 0); |
909 | if (i < 0) |
910 | break; |
911 | switch (i) { |
912 | case 'v': |
913 | verb++; |
914 | break; |
915 | case 'q': |
916 | if (verb) |
917 | verb--; |
918 | break; |
919 | default: |
920 | f |= f_bogus; |
921 | break; |
922 | } |
923 | } |
924 | argc -= optind; |
925 | argv += optind; |
926 | if ((f & f_bogus) || argc > 1) |
927 | die(EXIT_FAILURE, "Usage: verify [-qv] [file]"); |
928 | |
929 | /* --- Open the key file, and start reading the input file --- */ |
930 | |
931 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
932 | die(EXIT_FAILURE, "couldn't open keyring `%s'\n", keyring); |
933 | if (argc < 1) |
934 | fp = stdin; |
935 | else { |
936 | if ((fp = fopen(argv[0], "rb")) == 0) { |
937 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
938 | argv[0], strerror(errno)); |
939 | } |
940 | if (getc(fp) == 0) { |
941 | ungetc(0, fp); |
942 | f |= f_bin; |
943 | } else { |
944 | fclose(fp); |
945 | if ((fp = fopen(argv[0], "r")) == 0) { |
946 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
947 | argv[0], strerror(errno)); |
948 | } |
949 | } |
950 | } |
951 | |
952 | /* --- Read the introductory matter --- */ |
953 | |
954 | binit(&b); |
4e6e0188 |
955 | for (;;) { |
4bedc99b |
956 | breset(&b); |
957 | e = bget(&b, fp, f & f_bin); |
958 | if (e < 0) |
4e6e0188 |
959 | die(EXIT_FAILURE, "error reading packet: %s", errtab[-e]); |
4bedc99b |
960 | if (e >= T_BEGIN) |
961 | break; |
962 | switch (e) { |
963 | case T_IDENT: |
964 | if (verb > 2) |
965 | printf("INFO ident: `%s'\n", b.d.buf); |
966 | break; |
4bedc99b |
967 | case T_KEYID: |
968 | if ((k = key_byid(&kf, b.k)) == 0) { |
969 | if (verb) |
970 | printf("FAIL key %08lx not found\n", (unsigned long)b.k); |
971 | exit(EXIT_FAILURE); |
972 | } |
973 | if (verb > 2) { |
974 | DRESET(&b.d); |
975 | key_fulltag(k, &b.d); |
976 | printf("INFO key: %s\n", b.d.buf); |
977 | } |
978 | break; |
979 | default: |
980 | die(EXIT_FAILURE, "(internal) unknown packet type\n"); |
981 | break; |
982 | } |
983 | } |
984 | |
985 | /* --- Initialize the hash function and start reading hashed packets --- */ |
986 | |
4bedc99b |
987 | if (!k) { |
988 | if (verb) |
989 | puts("FAIL no keyid packet found"); |
990 | exit(EXIT_FAILURE); |
991 | } |
bd5efd74 |
992 | |
5c3f75ec |
993 | s = getsig(k, "dsig", 0); |
994 | if (verb && (err = s->ops->check(s)) != 0) |
995 | printf("WARN public key fails check: %s", err); |
996 | |
4bedc99b |
997 | for (;;) { |
998 | switch (e) { |
999 | case T_COMMENT: |
1000 | if (verb > 1) |
1001 | printf("INFO comment: `%s'\n", b.d.buf); |
4e6e0188 |
1002 | bemit(&b, 0, s->h, 0); |
4bedc99b |
1003 | break; |
1004 | case T_DATE: |
1005 | if (verb > 2) { |
1006 | DRESET(&b.d); |
1007 | timestring(b.t, &b.d); |
1008 | printf("INFO date: %s\n", b.d.buf); |
1009 | } |
4e6e0188 |
1010 | bemit(&b, 0, s->h, 0); |
4bedc99b |
1011 | break; |
1012 | case T_EXPIRE: { |
1013 | time_t now = time(0); |
1014 | if (b.t < now) { |
1015 | if (verb > 1) |
1016 | puts("BAD signature has expired"); |
1017 | f |= f_bogus; |
1018 | } |
1019 | if (verb > 2) { |
1020 | DRESET(&b.d); |
1021 | timestring(b.t, &b.d); |
1022 | printf("INFO expires: %s\n", b.d.buf); |
1023 | } |
4e6e0188 |
1024 | bemit(&b, 0, s->h, 0); |
4bedc99b |
1025 | } break; |
1026 | case T_FILE: |
1027 | DRESET(&d); |
4e6e0188 |
1028 | DENSURE(&d, GH_CLASS(s->h)->hashsz); |
1029 | if (fhash(GH_CLASS(s->h), b.d.buf, d.buf)) { |
4bedc99b |
1030 | if (verb > 1) { |
1031 | printf("BAD error reading file `%s': %s\n", |
1032 | b.d.buf, strerror(errno)); |
1033 | } |
1034 | f |= f_bogus; |
4e6e0188 |
1035 | } else if (b.b.len != GH_CLASS(s->h)->hashsz || |
4bedc99b |
1036 | memcmp(d.buf, b.b.buf, b.b.len) != 0) { |
1037 | if (verb > 1) |
1038 | printf("BAD file `%s' has incorrect hash\n", b.d.buf); |
1039 | f |= f_bogus; |
1040 | } else if (verb > 3) { |
1041 | fputs("INFO hash: ", stdout); |
1042 | fhex(stdout, b.b.buf, b.b.len); |
1043 | printf(" %s\n", b.d.buf); |
1044 | } |
4e6e0188 |
1045 | bemit(&b, 0, s->h, 0); |
4bedc99b |
1046 | break; |
1047 | case T_SIGNATURE: |
4e6e0188 |
1048 | if (s->ops->doit(s, &b.b)) { |
1049 | if (verb > 1) |
1050 | puts("BAD bad signature"); |
4bedc99b |
1051 | f |= f_bogus; |
1052 | } else if (verb > 2) |
1053 | puts("INFO good signature"); |
1054 | goto done; |
1055 | default: |
1056 | if (verb) |
1057 | printf("FAIL invalid packet type %i\n", e); |
1058 | exit(EXIT_FAILURE); |
1059 | break; |
1060 | } |
1061 | breset(&b); |
1062 | e = bget(&b, fp, f & f_bin); |
1063 | if (e < 0) { |
1064 | if (verb) |
1065 | printf("FAIL error reading packet: %s\n", errtab[-e]); |
1066 | exit(EXIT_FAILURE); |
1067 | } |
1068 | } |
1069 | done: |
1070 | bdestroy(&b); |
1071 | dstr_destroy(&d); |
4e6e0188 |
1072 | freesig(s); |
4bedc99b |
1073 | key_close(&kf); |
1074 | if (fp != stdin) |
1075 | fclose(fp); |
1076 | if (verb) { |
1077 | if (f & f_bogus) |
1078 | puts("FAIL signature invalid"); |
1079 | else |
1080 | puts("OK signature verified"); |
1081 | } |
1082 | return (f & f_bogus ? EXIT_FAILURE : EXIT_SUCCESS); |
16efd15b |
1083 | |
1084 | #undef f_bogus |
1085 | #undef f_bin |
1086 | #undef f_ok |
4bedc99b |
1087 | } |
1088 | |
1089 | /*----- Main code ---------------------------------------------------------*/ |
1090 | |
1091 | typedef struct cmd { |
1092 | const char *name; |
1093 | int (*func)(int /*argc*/, char */*argv*/[]); |
bd5efd74 |
1094 | const char *usage; |
4bedc99b |
1095 | const char *help; |
1096 | } cmd; |
1097 | |
1098 | static cmd cmdtab[] = { |
4bedc99b |
1099 | { "sign", sign, |
5c3f75ec |
1100 | "sign [-0bqv] [-c comment] [-k tag] [-e expire] [-f file] [-o output]", |
1101 | "\ |
bd5efd74 |
1102 | Options:\n\ |
1103 | \n\ |
1104 | -0, --null Read null-terminated filenames from stdin.\n\ |
1105 | -b, --binary Produce a binary output file.\n\ |
1106 | -q, --quiet Produce fewer messages while working.\n\ |
1107 | -v, --verbose Produce more messages while working.\n\ |
bd5efd74 |
1108 | -c, --comment=COMMENT Include COMMENT in the output file.\n\ |
1109 | -f, --file=FILE Read filenames to hash from FILE.\n\ |
1110 | -o, --output=FILE Write the signed result to FILE.\n\ |
4e6e0188 |
1111 | -k, --key=TAG Use a key named by TAG.\n\ |
bd5efd74 |
1112 | -e, --expire=TIME The signature should expire after TIME.\n\ |
1113 | " }, |
4bedc99b |
1114 | { "verify", verify, |
bd5efd74 |
1115 | "verify [-qv] [file]", "\ |
1116 | Options:\n\ |
1117 | \n\ |
1118 | -q, --quiet Produce fewer messages while working.\n\ |
1119 | -v, --verbose Produce more messages while working.\n\ |
1120 | " }, |
4bedc99b |
1121 | { 0, 0, 0 } |
1122 | }; |
1123 | |
bd5efd74 |
1124 | /* --- @findcmd@ --- * |
1125 | * |
1126 | * Arguments: @const char *name@ = a command name |
1127 | * |
1128 | * Returns: Pointer to the command structure. |
1129 | * |
1130 | * Use: Looks up a command by name. If the command isn't found, an |
1131 | * error is reported and the program is terminated. |
1132 | */ |
1133 | |
1134 | static cmd *findcmd(const char *name) |
1135 | { |
1136 | cmd *c, *chosen = 0; |
1137 | size_t sz = strlen(name); |
1138 | |
1139 | for (c = cmdtab; c->name; c++) { |
1140 | if (strncmp(name, c->name, sz) == 0) { |
1141 | if (c->name[sz] == 0) { |
1142 | chosen = c; |
1143 | break; |
1144 | } else if (chosen) |
1145 | die(EXIT_FAILURE, "ambiguous command name `%s'", name); |
1146 | else |
1147 | chosen = c; |
1148 | } |
1149 | } |
1150 | if (!chosen) |
1151 | die(EXIT_FAILURE, "unknown command name `%s'", name); |
1152 | return (chosen); |
1153 | } |
1154 | |
4bedc99b |
1155 | static void version(FILE *fp) |
1156 | { |
1157 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
1158 | } |
1159 | |
1160 | static void usage(FILE *fp) |
1161 | { |
1162 | pquis(fp, "Usage: $ [-k keyring] command [args]\n"); |
1163 | } |
1164 | |
bd5efd74 |
1165 | static void help(FILE *fp, char **argv) |
4bedc99b |
1166 | { |
1167 | cmd *c; |
bd5efd74 |
1168 | |
1169 | if (*argv) { |
1170 | c = findcmd(*argv); |
1171 | fprintf(fp, "Usage: %s [-k keyring] %s\n", QUIS, c->usage); |
1172 | if (c->help) { |
1173 | fputc('\n', fp); |
1174 | fputs(c->help, fp); |
1175 | } |
1176 | } else { |
1177 | version(fp); |
1178 | fputc('\n', fp); |
1179 | usage(fp); |
1180 | fputs("\n\ |
4bedc99b |
1181 | Create and verify signatures on lists of files.\n\ |
1182 | \n", fp); |
bd5efd74 |
1183 | for (c = cmdtab; c->name; c++) |
1184 | fprintf(fp, "%s\n", c->usage); |
1185 | } |
4bedc99b |
1186 | } |
1187 | |
1188 | /* --- @main@ --- * |
1189 | * |
1190 | * Arguments: @int argc@ = number of command line arguments |
1191 | * @char *argv[]@ = vector of command line arguments |
1192 | * |
1193 | * Returns: Zero if successful, nonzero otherwise. |
1194 | * |
1195 | * Use: Signs or verifies signatures on lists of files. Useful for |
1196 | * ensuring that a distribution is unmolested. |
1197 | */ |
1198 | |
1199 | int main(int argc, char *argv[]) |
1200 | { |
1201 | unsigned f = 0; |
4bedc99b |
1202 | |
16efd15b |
1203 | #define f_bogus 1u |
4bedc99b |
1204 | |
1205 | /* --- Initialize the library --- */ |
1206 | |
1207 | ego(argv[0]); |
1208 | sub_init(); |
1209 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
1210 | rand_seed(RAND_GLOBAL, 160); |
1211 | |
1212 | /* --- Parse options --- */ |
1213 | |
1214 | for (;;) { |
1215 | static struct option opts[] = { |
1216 | { "help", 0, 0, 'h' }, |
1217 | { "version", 0, 0, 'v' }, |
1218 | { "usage", 0, 0, 'u' }, |
1219 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
1220 | { 0, 0, 0, 0 } |
1221 | }; |
1222 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
1223 | if (i < 0) |
1224 | break; |
1225 | switch (i) { |
1226 | case 'h': |
bd5efd74 |
1227 | help(stdout, argv + optind); |
4bedc99b |
1228 | exit(0); |
1229 | break; |
1230 | case 'v': |
1231 | version(stdout); |
1232 | exit(0); |
1233 | break; |
1234 | case 'u': |
1235 | usage(stdout); |
1236 | exit(0); |
1237 | case 'k': |
1238 | keyring = optarg; |
1239 | break; |
1240 | default: |
1241 | f |= f_bogus; |
1242 | break; |
1243 | } |
1244 | } |
1245 | |
1246 | argc -= optind; |
1247 | argv += optind; |
1248 | optind = 0; |
1249 | if (f & f_bogus || argc < 1) { |
1250 | usage(stderr); |
1251 | exit(EXIT_FAILURE); |
1252 | } |
1253 | |
1254 | /* --- Dispatch to the correct subcommand handler --- */ |
1255 | |
bd5efd74 |
1256 | return (findcmd(argv[0])->func(argc, argv)); |
16efd15b |
1257 | |
1258 | #undef f_bogus |
4bedc99b |
1259 | } |
1260 | |
1261 | /*----- That's all, folks -------------------------------------------------*/ |