4bedc99b |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: dsig.c,v 1.1 2000/06/17 10:54:29 mdw Exp $ |
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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: dsig.c,v $ |
33 | * Revision 1.1 2000/06/17 10:54:29 mdw |
34 | * Program to generate and verify signatures on multiple files. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include "config.h" |
41 | |
42 | #include <ctype.h> |
43 | #include <errno.h> |
44 | #include <stdio.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
47 | |
48 | #include <mLib/alloc.h> |
49 | #include <mLib/base64.h> |
50 | #include <mLib/mdwopt.h> |
51 | #include <mLib/quis.h> |
52 | #include <mLib/report.h> |
53 | #include <mLib/sub.h> |
54 | |
55 | #include "dsa.h" |
56 | #include "getdate.h" |
57 | #include "grand.h" |
58 | #include "ghash.h" |
59 | #include "key.h" |
60 | #include "key-data.h" |
61 | #include "md5.h" |
62 | #include "noise.h" |
63 | #include "rmd160.h" |
64 | #include "rsa.h" |
65 | #include "sha.h" |
66 | |
67 | /*----- Digital signature algorithm ---------------------------------------*/ |
68 | |
69 | static int dsasign(key *k, const void *m, size_t msz, dstr *d) |
70 | { |
71 | dsa_priv dp; |
72 | key_packstruct ks[DSA_PRIVFETCHSZ]; |
73 | key_packdef *kp; |
74 | size_t sz; |
75 | octet *p; |
76 | int e; |
77 | |
78 | kp = key_fetchinit(dsa_privfetch, ks, &dp); |
79 | if ((e = key_fetch(kp, k)) != 0) { |
80 | key_fetchdone(kp); |
81 | return (e); |
82 | } |
83 | sz = mp_octets(dp.dp.q); |
84 | DENSURE(d, sz * 2); |
85 | p = d->buf + d->len; |
86 | rand_get(RAND_GLOBAL, p, sz); |
87 | dsa_sign(&dp.dp, dp.x, m, msz, p, sz, p, sz, p + sz, sz); |
88 | d->len += sz * 2; |
89 | key_fetchdone(kp); |
90 | return (0); |
91 | } |
92 | |
93 | static int dsaverify(key *k, const void *m, size_t msz, |
94 | const void *s, size_t ssz) |
95 | { |
96 | dsa_pub dp; |
97 | key_packstruct ks[DSA_PUBFETCHSZ]; |
98 | key_packdef *kp; |
99 | size_t sz; |
100 | int e; |
101 | |
102 | kp = key_fetchinit(dsa_pubfetch, ks, &dp); |
103 | if ((e = key_fetch(kp, k)) != 0) { |
104 | key_fetchdone(kp); |
105 | return (e); |
106 | } |
107 | sz = ssz / 2; |
108 | e = dsa_verify(&dp.dp, dp.y, m, msz, s, sz, s + sz, sz); |
109 | key_fetchdone(kp); |
110 | return (e); |
111 | } |
112 | |
113 | /*----- RSA signing -------------------------------------------------------*/ |
114 | |
115 | static int rsasign(key *k, const void *m, size_t msz, dstr *d) |
116 | { |
117 | rsa_priv rp; |
118 | key_packstruct ks[RSA_PRIVFETCHSZ]; |
119 | key_packdef *kp; |
120 | octet *p; |
121 | size_t sz; |
122 | mp *x; |
123 | int e; |
124 | |
125 | kp = key_fetchinit(rsa_privfetch, ks, &rp); |
126 | if ((e = key_fetch(kp, k)) != 0) { |
127 | key_fetchdone(kp); |
128 | return (e); |
129 | } |
130 | sz = mp_octets(rp.n); |
131 | if (sz < msz + 11) |
132 | die(EXIT_FAILURE, "key too small (help!)"); |
133 | DENSURE(d, sz); |
134 | p = d->buf + d->len; |
135 | memcpy(p + sz - msz, m, msz); |
136 | p[0] = 0; |
137 | p[1] = 1; |
138 | memset(p + 2, 0xff, sz - msz - 3); |
139 | p[sz - msz - 1] = 0; |
140 | memcpy(p + sz - msz, m, msz); |
141 | x = mp_loadb(MP_NEW, p, sz); |
142 | x = rsa_decrypt(&rp, x, x, &rand_global); |
143 | mp_storeb(x, p, sz); |
144 | d->len += sz; |
145 | mp_drop(x); |
146 | key_fetchdone(kp); |
147 | return (0); |
148 | } |
149 | |
150 | static int rsaverify(key *k, const void *m, size_t msz, |
151 | const void *s, size_t ssz) |
152 | { |
153 | rsa_pub rp; |
154 | key_packstruct ks[RSA_PUBFETCHSZ]; |
155 | key_packdef *kp; |
156 | octet *p; |
157 | size_t sz; |
158 | mp *x; |
159 | mpmont mm; |
160 | int ok = 0; |
161 | int e; |
162 | int i; |
163 | |
164 | kp = key_fetchinit(rsa_pubfetch, ks, &rp); |
165 | if ((e = key_fetch(kp, k)) != 0) { |
166 | key_fetchdone(kp); |
167 | return (e); |
168 | } |
169 | x = mp_loadb(MP_NEW, s, ssz); |
170 | mpmont_create(&mm, rp.n); |
171 | x = mpmont_exp(&mm, x, x, rp.e); |
172 | mpmont_destroy(&mm); |
173 | sz = mp_octets(rp.n); |
174 | p = xmalloc(sz); |
175 | mp_storeb(x, p, sz); |
176 | mp_drop(x); |
177 | key_fetchdone(kp); |
178 | if (msz + 11 >= sz || p[0] != 0 || p[1] != 1 || p[sz - msz - 1] != 0) |
179 | goto done; |
180 | for (i = 2; i < sz - msz - 1; i++) { |
181 | if (p[i] != 0xff) |
182 | goto done; |
183 | } |
184 | if (memcmp(m, p + sz - msz, msz) != 0) |
185 | goto done; |
186 | ok = 1; |
187 | done: |
188 | free(p); |
189 | return (ok); |
190 | } |
191 | |
192 | /*----- Algorithm choice --------------------------------------------------*/ |
193 | |
194 | typedef struct sig { |
195 | const char *name; |
196 | const char *type; |
197 | int (*sign)(key */*k*/, const void */*m*/, size_t /*msz*/, dstr */*d*/); |
198 | int (*verify)(key */*k*/, const void */*m*/, size_t /*msz*/, |
199 | const void */*s*/, size_t /*ssz*/); |
200 | } sig; |
201 | |
202 | static const gchash *hashtab[] = { &rmd160, &sha, &md5, 0 }; |
203 | static sig sigtab[] = { |
204 | { "dsa", "dsig-dsa", dsasign, dsaverify }, |
205 | { "rsa", "dsig-rsa", rsasign, rsaverify }, |
206 | { 0, 0, 0 } |
207 | }; |
208 | |
209 | /* --- @gethash@ --- * |
210 | * |
211 | * Arguments: @const char *name@ = pointer to name string |
212 | * |
213 | * Returns: Pointer to appropriate hash class. |
214 | * |
215 | * Use: Chooses a hash function by name. |
216 | */ |
217 | |
218 | static const gchash *gethash(const char *name) |
219 | { |
220 | const gchash **g, *gg = 0; |
221 | size_t sz = strlen(name); |
222 | for (g = hashtab; *g; g++) { |
223 | if (strncmp(name, (*g)->name, sz) == 0) { |
224 | if ((*g)->name[sz] == 0) { |
225 | gg = *g; |
226 | break; |
227 | } else if (gg) |
228 | return (0); |
229 | else |
230 | gg = *g; |
231 | } |
232 | } |
233 | return (gg); |
234 | } |
235 | |
236 | /* --- @getsig@ --- * |
237 | * |
238 | * Arguments: @const char *name@ = pointer to name string |
239 | * |
240 | * Returns: Pointer to appropriate signature type. |
241 | * |
242 | * Use: Chooses a signature algorithm by name. |
243 | */ |
244 | |
245 | static sig *getsig(const char *name) |
246 | { |
247 | sig *s, *ss = 0; |
248 | size_t sz = strlen(name); |
249 | for (s = sigtab; s->name; s++) { |
250 | if (strncmp(name, s->name, sz) == 0) { |
251 | if (s->name[sz] == 0) { |
252 | ss = s; |
253 | break; |
254 | } else if (ss) |
255 | return (0); |
256 | else |
257 | ss = s; |
258 | } |
259 | } |
260 | return (ss); |
261 | } |
262 | |
263 | /*----- Data formatting ---------------------------------------------------*/ |
264 | |
265 | /* --- Binary data structure --- * |
266 | * |
267 | * The binary format, which is used for hashing and for the optional binary |
268 | * output, consists of a sequence of tagged blocks. The tag describes the |
269 | * format and meaining of the following data. |
270 | */ |
271 | |
272 | enum { |
273 | /* --- Block tags --- */ |
274 | |
275 | T_IDENT = 0, /* An identifying marker */ |
276 | T_SIGALG, /* Signature algorithm used */ |
277 | T_HASHALG, /* Hash algorithm used */ |
278 | T_KEYID, /* Key identifier */ |
279 | T_BEGIN, /* Begin hashing here */ |
280 | T_COMMENT = T_BEGIN, /* A textual comment */ |
281 | T_DATE, /* Creation date of signature */ |
282 | T_EXPIRE, /* Expiry date of signature */ |
283 | T_FILE, /* File and corresponding hash */ |
284 | T_SIGNATURE, /* Final signature block */ |
285 | |
286 | /* --- Error messages --- */ |
287 | |
288 | E_EOF = -1, |
289 | E_BIN = -2, |
290 | E_TAG = -3, |
291 | E_DATE = -4 |
292 | }; |
293 | |
294 | /* --- Name translation table --- */ |
295 | |
296 | static const char *tagtab[] = { |
297 | "ident:", "sigalg:", "hashalg:", "keyid:", |
298 | "comment:", "date:", "expires:", "file:", |
299 | "signature:", |
300 | 0 |
301 | }; |
302 | |
303 | static const char *errtab[] = { |
304 | "Off-by-one bug", |
305 | "Unexpected end-of-file", |
306 | "Binary object too large", |
307 | "Unrecognized tag", |
308 | "Bad date string" |
309 | }; |
310 | |
311 | /* --- Memory representation of block types --- */ |
312 | |
313 | typedef struct block { |
314 | int tag; /* Type tag */ |
315 | dstr d; /* String data */ |
316 | dstr b; /* Binary data */ |
317 | time_t t; /* Timestamp */ |
318 | uint32 k; /* Keyid */ |
319 | } block; |
320 | |
321 | /* --- @getstring@ --- * |
322 | * |
323 | * Arguments: @FILE *fp@ = stream from which to read |
324 | * @dstr *d@ = destination string |
325 | * @unsigned raw@ = raw or cooked read |
326 | * |
327 | * Returns: Zero if OK, nonzero on end-of-file. |
328 | * |
329 | * Use: Reads a filename (or something similar) from a stream. |
330 | */ |
331 | |
332 | static int getstring(FILE *fp, dstr *d, unsigned raw) |
333 | { |
334 | int ch; |
335 | int q = 0; |
336 | |
337 | /* --- Raw: just read exactly what's written up to a null byte --- */ |
338 | |
339 | if (raw) { |
340 | if ((ch = getc(fp)) == EOF) |
341 | return (EOF); |
342 | for (;;) { |
343 | if (!ch) |
344 | break; |
345 | DPUTC(d, ch); |
346 | if ((ch = getc(fp)) == EOF) |
347 | break; |
348 | } |
349 | DPUTZ(d); |
350 | return (0); |
351 | } |
352 | |
353 | /* --- Skip as far as whitespace --- * |
354 | * |
355 | * Also skip past comments. |
356 | */ |
357 | |
358 | again: |
359 | ch = getc(fp); |
360 | while (isspace((unsigned char)ch)) |
361 | ch = getc(fp); |
362 | if (ch == '#') { |
363 | do ch = getc(fp); while (ch != '\n' && ch != EOF); |
364 | goto again; |
365 | } |
366 | if (ch == EOF) |
367 | return (EOF); |
368 | |
369 | /* --- If the character is a quote then read a quoted string --- */ |
370 | |
371 | switch (ch) { |
372 | case '`': |
373 | ch = '\''; |
374 | case '\'': |
375 | case '\"': |
376 | q = ch; |
377 | ch = getc(fp); |
378 | break; |
379 | } |
380 | |
381 | /* --- Now read all sorts of interesting things --- */ |
382 | |
383 | for (;;) { |
384 | |
385 | /* --- Handle an escaped thing --- */ |
386 | |
387 | if (ch == '\\') { |
388 | ch = getc(fp); |
389 | if (ch == EOF) |
390 | break; |
391 | switch (ch) { |
392 | case 'a': ch = '\n'; break; |
393 | case 'b': ch = '\b'; break; |
394 | case 'f': ch = '\f'; break; |
395 | case 'n': ch = '\n'; break; |
396 | case 'r': ch = '\r'; break; |
397 | case 't': ch = '\t'; break; |
398 | case 'v': ch = '\v'; break; |
399 | } |
400 | DPUTC(d, ch); |
401 | continue; |
402 | } |
403 | |
404 | /* --- If it's a quote or some other end marker then stop --- */ |
405 | |
406 | if (ch == q || (!q && isspace((unsigned char)ch))) |
407 | break; |
408 | |
409 | /* --- Otherwise contribute and continue --- */ |
410 | |
411 | DPUTC(d, ch); |
412 | if ((ch = getc(fp)) == EOF) |
413 | break; |
414 | } |
415 | |
416 | /* --- Done --- */ |
417 | |
418 | DPUTZ(d); |
419 | return (0); |
420 | } |
421 | |
422 | /* --- @putstring@ --- * |
423 | * |
424 | * Arguments: @FILE *fp@ = stream to write on |
425 | * @const char *p@ = pointer to text |
426 | * @unsigned raw@ = whether the string is to be written raw |
427 | * |
428 | * Returns: --- |
429 | * |
430 | * Use: Emits a string to a stream. |
431 | */ |
432 | |
433 | static void putstring(FILE *fp, const char *p, unsigned raw) |
434 | { |
435 | size_t sz = strlen(p); |
436 | unsigned qq; |
437 | const char *q; |
438 | |
439 | /* --- Just write the string null terminated if raw --- */ |
440 | |
441 | if (raw) { |
442 | fwrite(p, 1, sz + 1, fp); |
443 | return; |
444 | } |
445 | |
446 | /* --- Check for any dodgy characters --- */ |
447 | |
448 | qq = 0; |
449 | for (q = p; *q; q++) { |
450 | if (isspace((unsigned char)*q)) { |
451 | qq = '\"'; |
452 | break; |
453 | } |
454 | } |
455 | |
456 | if (qq) |
457 | putc(qq, fp); |
458 | |
459 | /* --- Emit the string --- */ |
460 | |
461 | for (q = p; *q; q++) { |
462 | switch (*q) { |
463 | case '\a': fputc('\\', fp); fputc('a', fp); break; |
464 | case '\b': fputc('\\', fp); fputc('b', fp); break; |
465 | case '\f': fputc('\\', fp); fputc('f', fp); break; |
466 | case '\n': fputc('\\', fp); fputc('n', fp); break; |
467 | case '\r': fputc('\\', fp); fputc('r', fp); break; |
468 | case '\t': fputc('\\', fp); fputc('t', fp); break; |
469 | case '\v': fputc('\\', fp); fputc('v', fp); break; |
470 | case '`': fputc('\\', fp); fputc('`', fp); break; |
471 | case '\'': fputc('\\', fp); fputc('\'', fp); break; |
472 | case '\"': fputc('\\', fp); fputc('\"', fp); break; |
473 | default: |
474 | putc(*q, fp); |
475 | break; |
476 | } |
477 | } |
478 | |
479 | /* --- Done --- */ |
480 | |
481 | if (qq) |
482 | putc(qq, fp); |
483 | } |
484 | |
485 | /* --- @timestring@ --- * |
486 | * |
487 | * Arguments: @time_t t@ = a timestamp |
488 | * @dstr *d@ = a string to write on |
489 | * |
490 | * Returns: --- |
491 | * |
492 | * Use: Writes a textual representation of the timestamp to the |
493 | * string. |
494 | */ |
495 | |
496 | static void timestring(time_t t, dstr *d) |
497 | { |
498 | if (t == KEXP_FOREVER) |
499 | DPUTS(d, "forever"); |
500 | else { |
501 | struct tm *tm = localtime(&t); |
502 | DENSURE(d, 32); |
503 | d->len += strftime(d->buf + d->len, 32, "%Y-%m-%d %H:%M:%S %Z", tm); |
504 | DPUTZ(d); |
505 | } |
506 | } |
507 | |
508 | /* --- @breset@ --- * |
509 | * |
510 | * Arguments: @block *b@ = block to reset |
511 | * |
512 | * Returns: --- |
513 | * |
514 | * Use: Resets a block so that more stuff can be put in it. |
515 | */ |
516 | |
517 | static void breset(block *b) |
518 | { |
519 | b->tag = 0; |
520 | DRESET(&b->d); |
521 | DRESET(&b->b); |
522 | b->k = 0; |
523 | b->t = KEXP_EXPIRE; |
524 | } |
525 | |
526 | /* --- @binit@ --- * |
527 | * |
528 | * Arguments: @block *b@ = block to initialize |
529 | * |
530 | * Returns: --- |
531 | * |
532 | * Use: Initializes a block as something to read into. |
533 | */ |
534 | |
535 | static void binit(block *b) |
536 | { |
537 | dstr_create(&b->d); |
538 | dstr_create(&b->b); |
539 | breset(b); |
540 | } |
541 | |
542 | /* --- @bdestroy@ --- * |
543 | * |
544 | * Arguments: @block *b@ = block to destroy |
545 | * |
546 | * Returns: --- |
547 | * |
548 | * Use: Destroys a block's contents. |
549 | */ |
550 | |
551 | static void bdestroy(block *b) |
552 | { |
553 | dstr_destroy(&b->d); |
554 | dstr_destroy(&b->b); |
555 | } |
556 | |
557 | /* --- @bget@ --- * |
558 | * |
559 | * Arguments: @block *b@ = pointer to block |
560 | * @FILE *fp@ = stream to read from |
561 | * @unsigned bin@ = binary switch |
562 | * |
563 | * Returns: Tag of block, or an error tag. |
564 | * |
565 | * Use: Reads a block from a stream. |
566 | */ |
567 | |
568 | static int bget(block *b, FILE *fp, unsigned bin) |
569 | { |
570 | int tag; |
571 | |
572 | /* --- Read the tag --- */ |
573 | |
574 | if (bin) |
575 | tag = getc(fp); |
576 | else { |
577 | dstr d = DSTR_INIT; |
578 | if (getstring(fp, &d, 0)) |
579 | return (E_EOF); |
580 | for (tag = 0; tagtab[tag]; tag++) { |
581 | if (strcmp(tagtab[tag], d.buf) == 0) |
582 | goto done; |
583 | } |
584 | return (E_TAG); |
585 | done:; |
586 | } |
587 | |
588 | /* --- Decide what to do next --- */ |
589 | |
590 | breset(b); |
591 | b->tag = tag; |
592 | switch (tag) { |
593 | |
594 | /* --- Reading of strings --- */ |
595 | |
596 | case T_IDENT: |
597 | case T_COMMENT: |
598 | case T_SIGALG: |
599 | case T_HASHALG: |
600 | if (getstring(fp, &b->d, bin)) |
601 | return (E_EOF); |
602 | break; |
603 | |
604 | /* --- Timestamps --- */ |
605 | |
606 | case T_DATE: |
607 | case T_EXPIRE: |
608 | if (bin) { |
609 | octet buf[8]; |
610 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
611 | return (E_EOF); |
612 | b->t = ((time_t)(((LOAD32(buf + 0) << 16) << 16) & ~MASK32) | |
613 | (time_t)LOAD32(buf + 4)); |
614 | } else { |
615 | if (getstring(fp, &b->d, 0)) |
616 | return (E_EOF); |
617 | if (strcmp(b->d.buf, "forever") == 0) |
618 | b->t = KEXP_FOREVER; |
619 | else if ((b->t = get_date(b->d.buf, 0)) == -1) |
620 | return (E_DATE); |
621 | } |
622 | break; |
623 | |
624 | /* --- Key ids --- */ |
625 | |
626 | case T_KEYID: |
627 | if (bin) { |
628 | octet buf[4]; |
629 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
630 | return (E_EOF); |
631 | b->k = LOAD32(buf); |
632 | } else { |
633 | if (getstring(fp, &b->d, 0)) |
634 | return (E_EOF); |
635 | b->k = strtoul(b->d.buf, 0, 16); |
636 | } |
637 | break; |
638 | |
639 | /* --- Reading of binary data --- */ |
640 | |
641 | case T_FILE: |
642 | case T_SIGNATURE: |
643 | if (bin) { |
644 | octet buf[2]; |
645 | uint32 sz; |
646 | if (fread(buf, sizeof(buf), 1, fp) < 1) |
647 | return (E_EOF); |
648 | sz = LOAD16(buf); |
649 | if (sz > 4096) |
650 | return (E_BIN); |
651 | DENSURE(&b->b, sz); |
652 | if (fread(b->b.buf + b->b.len, 1, sz, fp) < sz) |
653 | return (E_EOF); |
654 | b->b.len += sz; |
655 | } else { |
656 | base64_ctx b64; |
657 | if (getstring(fp, &b->d, 0)) |
658 | return (E_EOF); |
659 | base64_init(&b64); |
660 | base64_decode(&b64, b->d.buf, b->d.len, &b->b); |
661 | base64_decode(&b64, 0, 0, &b->b); |
662 | DRESET(&b->d); |
663 | } |
664 | if (tag == T_FILE && getstring(fp, &b->d, bin)) |
665 | return (E_EOF); |
666 | break; |
667 | |
668 | /* --- Anything else --- */ |
669 | |
670 | default: |
671 | return (E_TAG); |
672 | } |
673 | |
674 | return (tag); |
675 | } |
676 | |
677 | /* --- @blob@ --- * |
678 | * |
679 | * Arguments: @block *b@ = pointer to block to emit |
680 | * @dstr *d@ = output buffer |
681 | * |
682 | * Returns: --- |
683 | * |
684 | * Use: Encodes a block in a binary format. |
685 | */ |
686 | |
687 | static void blob(block *b, dstr *d) |
688 | { |
689 | DPUTC(d, b->tag); |
690 | switch (b->tag) { |
691 | case T_IDENT: |
692 | case T_SIGALG: |
693 | case T_HASHALG: |
694 | case T_COMMENT: |
695 | DPUTD(d, &b->d); |
696 | DPUTC(d, 0); |
697 | break; |
698 | case T_DATE: |
699 | case T_EXPIRE: |
700 | DENSURE(d, 8); |
701 | STORE32(d->buf + d->len, ((b->t & ~MASK32) >> 16) >> 16); |
702 | STORE32(d->buf + d->len + 4, b->t); |
703 | d->len += 8; |
704 | break; |
705 | case T_KEYID: |
706 | DENSURE(d, 4); |
707 | STORE32(d->buf + d->len, b->k); |
708 | d->len += 4; |
709 | break; |
710 | case T_FILE: |
711 | case T_SIGNATURE: |
712 | DENSURE(d, 2); |
713 | STORE16(d->buf + d->len, b->b.len); |
714 | d->len += 2; |
715 | DPUTD(d, &b->b); |
716 | if (b->tag == T_FILE) { |
717 | DPUTD(d, &b->d); |
718 | DPUTC(d, 0); |
719 | } |
720 | break; |
721 | } |
722 | } |
723 | |
724 | /* --- @bwrite@ --- * |
725 | * |
726 | * Arguments: @block *b@ = pointer to block to write |
727 | * @FILE *fp@ = stream to write on |
728 | * |
729 | * Returns: --- |
730 | * |
731 | * Use: Writes a block on a stream in a textual format. |
732 | */ |
733 | |
734 | static void bwrite(block *b, FILE *fp) |
735 | { |
736 | fputs(tagtab[b->tag], fp); |
737 | putc(' ', fp); |
738 | switch (b->tag) { |
739 | case T_IDENT: |
740 | case T_SIGALG: |
741 | case T_HASHALG: |
742 | case T_COMMENT: |
743 | putstring(fp, b->d.buf, 0); |
744 | break; |
745 | case T_DATE: |
746 | case T_EXPIRE: { |
747 | dstr d = DSTR_INIT; |
748 | timestring(b->t, &d); |
749 | putstring(fp, d.buf, 0); |
750 | dstr_destroy(&d); |
751 | } break; |
752 | case T_KEYID: |
753 | fprintf(fp, "%08lx", (unsigned long)b->k); |
754 | break; |
755 | case T_FILE: |
756 | case T_SIGNATURE: { |
757 | dstr d = DSTR_INIT; |
758 | base64_ctx b64; |
759 | base64_init(&b64); |
760 | b64.maxline = 0; |
761 | base64_encode(&b64, b->b.buf, b->b.len, &d); |
762 | base64_encode(&b64, 0, 0, &d); |
763 | dstr_write(&d, fp); |
764 | if (b->tag == T_FILE) { |
765 | putc(' ', fp); |
766 | putstring(fp, b->d.buf, 0); |
767 | } |
768 | } break; |
769 | } |
770 | putc('\n', fp); |
771 | } |
772 | |
773 | /* --- @bemit@ --- * |
774 | * |
775 | * Arguments: @block *b@ = pointer to block to write |
776 | * @FILE *fp@ = file to write on |
777 | * @ghash *h@ = pointer to hash function |
778 | * @unsigned bin@ = binary/text flag |
779 | * |
780 | * Returns: --- |
781 | * |
782 | * Use: Spits out a block properly. |
783 | */ |
784 | |
785 | static void bemit(block *b, FILE *fp, ghash *h, unsigned bin) |
786 | { |
787 | if (h || (fp && bin)) { |
788 | dstr d = DSTR_INIT; |
789 | blob(b, &d); |
790 | if (h) |
791 | h->ops->hash(h, d.buf, d.len); |
792 | if (fp && bin) |
793 | fwrite(d.buf, d.len, 1, fp); |
794 | } |
795 | if (fp && !bin) |
796 | bwrite(b, fp); |
797 | } |
798 | |
799 | /*----- Static variables --------------------------------------------------*/ |
800 | |
801 | static const char *keyring = "keyring"; |
802 | |
803 | /*----- Other shared functions --------------------------------------------*/ |
804 | |
805 | /* --- @keyreport@ --- * |
806 | * |
807 | * Arguments: @const char *file@ = filename containing the error |
808 | * @int line@ = line number in file |
809 | * @const char *err@ = error text message |
810 | * @void *p@ = unimportant pointer |
811 | * |
812 | * Returns: --- |
813 | * |
814 | * Use: Reports errors during the opening of a key file. |
815 | */ |
816 | |
817 | static void keyreport(const char *file, int line, const char *err, void *p) |
818 | { |
819 | moan("error in keyring `%s' at line `%s': %s", file, line, err); |
820 | } |
821 | |
822 | /* --- @fhash@ --- * |
823 | * |
824 | * Arguments: @const gchash *c@ = pointer to hash class |
825 | * @const char *file@ = file to hash |
826 | * @octet *b@ = pointer to output buffer |
827 | * |
828 | * Returns: Zero if it worked, or nonzero for a system error. |
829 | * |
830 | * Use: Hashes a file. |
831 | */ |
832 | |
833 | static int fhash(const gchash *c, const char *file, octet *b) |
834 | { |
835 | FILE *fp = fopen(file, "rb"); |
836 | ghash *h = c->init(); |
837 | char buf[4096]; |
838 | size_t sz; |
839 | int rc = 0; |
840 | |
841 | if (!fp) |
842 | return (-1); |
843 | while ((sz = fread(buf, 1, sizeof(buf), fp)) > 0) |
844 | h->ops->hash(h, buf, sz); |
845 | if (ferror(fp)) |
846 | rc = -1; |
847 | h->ops->done(h, b); |
848 | h->ops->destroy(h); |
849 | fclose(fp); |
850 | return (rc); |
851 | } |
852 | |
853 | /* --- @fhex@ --- * |
854 | * |
855 | * Arguments: @FILE *fp@ = file to write on |
856 | * @const void *p@ = pointer to data to be written |
857 | * @size_t sz@ = size of the data to write |
858 | * |
859 | * Returns: --- |
860 | * |
861 | * Use: Emits a hex dump to a stream. |
862 | */ |
863 | |
864 | static void fhex(FILE *fp, const void *p, size_t sz) |
865 | { |
866 | const octet *q = p; |
867 | if (!sz) |
868 | return; |
869 | for (;;) { |
870 | fprintf(fp, "%02x", *q++); |
871 | sz--; |
872 | if (!sz) |
873 | break; |
874 | /* putc(' ', fp); */ |
875 | } |
876 | } |
877 | |
878 | /*----- Signature generation ----------------------------------------------*/ |
879 | |
880 | static int sign(int argc, char *argv[]) |
881 | { |
882 | enum { |
883 | f_raw = 1, |
884 | f_bin = 2, |
885 | f_bogus = 4 |
886 | }; |
887 | |
888 | unsigned f = 0; |
889 | const char *kt = 0; |
890 | const char *ki = 0; |
891 | key_file kf; |
892 | key *k; |
893 | const sig *s = sigtab; |
894 | const gchash *gch = &rmd160; |
895 | ghash *h; |
896 | time_t exp = KEXP_EXPIRE; |
897 | unsigned verb = 0; |
898 | const char *ifile = 0; |
899 | const char *ofile = 0; |
900 | const char *c = 0; |
901 | FILE *ifp, *ofp; |
902 | dstr d = DSTR_INIT; |
903 | block b; |
904 | int e; |
905 | |
906 | for (;;) { |
907 | static struct option opts[] = { |
908 | { "null", 0, 0, '0' }, |
909 | { "binary", 0, 0, 'b' }, |
910 | { "verbose", 0, 0, 'v' }, |
911 | { "quiet", 0, 0, 'q' }, |
912 | { "algorithm", OPTF_ARGREQ, 0, 'a' }, |
913 | { "hash", OPTF_ARGREQ, 0, 'h' }, |
914 | { "comment", OPTF_ARGREQ, 0, 'c' }, |
915 | { "file", OPTF_ARGREQ, 0, 'f' }, |
916 | { "output", OPTF_ARGREQ, 0, 'o' }, |
917 | { "keytype", OPTF_ARGREQ, 0, 't' }, |
918 | { "keyid", OPTF_ARGREQ, 0, 'i' }, |
919 | { "key", OPTF_ARGREQ, 0, 'i' }, |
920 | { "expire", OPTF_ARGREQ, 0, 'e' }, |
921 | { 0, 0, 0, 0 } |
922 | }; |
923 | int i = mdwopt(argc, argv, "+0vqb a:h:c: f:o: t:i:k:e:", opts, 0, 0, 0); |
924 | if (i < 0) |
925 | break; |
926 | switch (i) { |
927 | case '0': |
928 | f |= f_raw; |
929 | break; |
930 | case 'b': |
931 | f |= f_bin; |
932 | break; |
933 | case 'v': |
934 | verb++; |
935 | break; |
936 | case 'q': |
937 | if (verb > 0) |
938 | verb--; |
939 | break; |
940 | case 'a': |
941 | if ((s = getsig(optarg)) == 0) { |
942 | die(EXIT_FAILURE, "unknown or ambiguous signature algorithm `%s'", |
943 | optarg); |
944 | } |
945 | break; |
946 | case 'h': |
947 | if ((gch = gethash(optarg)) == 0) { |
948 | die(EXIT_FAILURE, "unknown or ambiguous hash function `%s'", |
949 | optarg); |
950 | } |
951 | break; |
952 | case 'c': |
953 | c = optarg; |
954 | break; |
955 | case 'f': |
956 | ifile = optarg; |
957 | break; |
958 | case 'o': |
959 | ofile = optarg; |
960 | break; |
961 | case 't': |
962 | kt = optarg; |
963 | break; |
964 | case 'i': |
965 | case 'k': |
966 | ki = optarg; |
967 | break; |
968 | case 'e': |
969 | if (strcmp(optarg, "forever") == 0) |
970 | exp = KEXP_FOREVER; |
971 | else if ((exp = get_date(optarg, 0)) == -1) |
972 | die(EXIT_FAILURE, "bad expiry time"); |
973 | break; |
974 | default: |
975 | f |= f_bogus; |
976 | break; |
977 | } |
978 | } |
979 | if (optind != argc || (f & f_bogus)) |
980 | die(EXIT_FAILURE, "Usage: sign [-options]"); |
981 | |
982 | /* --- Locate the signing key --- */ |
983 | |
984 | if (key_open(&kf, keyring, KOPEN_WRITE, keyreport, 0)) |
985 | die(EXIT_FAILURE, "couldn't open keyring `%s'", keyring); |
986 | if (ki) { |
987 | if ((k = key_bytag(&kf, ki)) == 0) |
988 | die(EXIT_FAILURE, "couldn't find key `%s'", ki); |
989 | } else { |
990 | if (!kt) |
991 | kt = s->type; |
992 | if ((k = key_bytype(&kf, kt)) == 0) |
993 | die(EXIT_FAILURE, "no appropriate key of type `%s'", kt); |
994 | } |
995 | key_fulltag(k, &d); |
996 | if (exp == KEXP_FOREVER && k->exp != KEXP_FOREVER) { |
997 | die(EXIT_FAILURE, "key `%s' expires: can't create nonexpiring signature", |
998 | d.buf); |
999 | } |
1000 | |
1001 | /* --- Open files --- */ |
1002 | |
1003 | if (!ifile) |
1004 | ifp = stdin; |
1005 | else if ((ifp = fopen(ifile, (f & f_raw) ? "rb" : "r")) == 0) { |
1006 | die(EXIT_FAILURE, "couldn't open input file `%s': %s", |
1007 | ifile, strerror(errno)); |
1008 | } |
1009 | |
1010 | if (!ofile) |
1011 | ofp = stdout; |
1012 | else if ((ofp = fopen(ofile, (f & f_bin) ? "wb" : "w")) == 0) { |
1013 | die(EXIT_FAILURE, "couldn't open output file `%s': %s", |
1014 | ofile, strerror(errno)); |
1015 | } |
1016 | |
1017 | /* --- Emit the start of the output --- */ |
1018 | |
1019 | binit(&b); b.tag = T_IDENT; |
1020 | dstr_putf(&b.d, "%s, Catacomb version " VERSION, QUIS); |
1021 | bemit(&b, ofp, 0, f & f_bin); |
1022 | |
1023 | breset(&b); b.tag = T_SIGALG; DPUTS(&b.d, s->name); |
1024 | bemit(&b, ofp, 0, f & f_bin); |
1025 | |
1026 | breset(&b); b.tag = T_HASHALG; DPUTS(&b.d, gch->name); |
1027 | bemit(&b, ofp, 0, f & f_bin); |
1028 | |
1029 | breset(&b); b.tag = T_KEYID; b.k = k->id; |
1030 | bemit(&b, ofp, 0, f & f_bin); |
1031 | |
1032 | /* --- Start hashing, and emit the datestamps and things --- */ |
1033 | |
1034 | { |
1035 | time_t now = time(0); |
1036 | |
1037 | h = gch->init(); |
1038 | breset(&b); b.tag = T_DATE; b.t = now; bemit(&b, ofp, h, f & f_bin); |
1039 | if (exp == KEXP_EXPIRE) |
1040 | exp = now + 86400 * 28; |
1041 | breset(&b); b.tag = T_EXPIRE; b.t = exp; bemit(&b, ofp, h, f & f_bin); |
1042 | if (c) { |
1043 | breset(&b); b.tag = T_COMMENT; DPUTS(&b.d, c); |
1044 | bemit(&b, ofp, h, f & f_bin); |
1045 | } |
1046 | |
1047 | if (!(f & f_bin)) |
1048 | putc('\n', ofp); |
1049 | } |
1050 | |
1051 | /* --- Now hash the various files --- */ |
1052 | |
1053 | for (;;) { |
1054 | |
1055 | /* --- Stop on an output error --- */ |
1056 | |
1057 | if (ferror(ofp)) { |
1058 | f |= f_bogus; |
1059 | break; |
1060 | } |
1061 | |
1062 | /* --- Read the next filename to hash --- */ |
1063 | |
1064 | breset(&b); |
1065 | if (getstring(ifp, &b.d, f & f_raw)) |
1066 | break; |
1067 | b.tag = T_FILE; |
1068 | DENSURE(&b.b, h->ops->c->hashsz); |
1069 | if (fhash(gch, b.d.buf, b.b.buf)) { |
1070 | moan("Error reading `%s': %s", b.d.buf, strerror(errno)); |
1071 | f |= f_bogus; |
1072 | } else { |
1073 | b.b.len += h->ops->c->hashsz; |
1074 | if (verb) { |
1075 | fhex(stderr, b.b.buf, b.b.len); |
1076 | fprintf(stderr, " %s\n", b.d.buf); |
1077 | } |
1078 | bemit(&b, ofp, h, f & f_bin); |
1079 | } |
1080 | } |
1081 | |
1082 | /* --- Create the signature --- */ |
1083 | |
1084 | if (!(f & f_bogus)) { |
1085 | breset(&b); |
1086 | b.tag = T_SIGNATURE; |
1087 | DENSURE(&b.d, h->ops->c->hashsz); |
1088 | h->ops->done(h, b.d.buf); |
1089 | if ((e = s->sign(k, b.d.buf, h->ops->c->hashsz, &b.b)) != 0) { |
1090 | moan("error creating signature: %s", key_strerror(e)); |
1091 | f |= f_bogus; |
1092 | } |
1093 | if (!(f & f_bogus)) { |
1094 | bemit(&b, ofp, 0, f & f_bin); |
1095 | key_used(&kf, k, exp); |
1096 | } |
1097 | } |
1098 | |
1099 | /* --- Tidy up at the end --- */ |
1100 | |
1101 | bdestroy(&b); |
1102 | if (ifile) |
1103 | fclose(ifp); |
1104 | if (ofile) { |
1105 | if (fclose(ofp)) |
1106 | f |= f_bogus; |
1107 | } else { |
1108 | if (fflush(ofp)) |
1109 | f |= f_bogus; |
1110 | } |
1111 | if ((e = key_close(&kf)) != 0) { |
1112 | switch (e) { |
1113 | case KWRITE_FAIL: |
1114 | die(EXIT_FAILURE, "couldn't write file `%s': %s", |
1115 | keyring, strerror(errno)); |
1116 | case KWRITE_BROKEN: |
1117 | die(EXIT_FAILURE, "keyring file `%s' broken: %s (repair manually)", |
1118 | keyring, strerror(errno)); |
1119 | } |
1120 | } |
1121 | if (f & f_bogus) |
1122 | die(EXIT_FAILURE, "error(s) occurred while creating signature"); |
1123 | return (EXIT_SUCCESS); |
1124 | } |
1125 | |
1126 | /*----- Signature verification --------------------------------------------*/ |
1127 | |
1128 | static int verify(int argc, char *argv[]) |
1129 | { |
1130 | enum { |
1131 | f_bogus = 1, |
1132 | f_bin = 2, |
1133 | f_ok = 4 |
1134 | }; |
1135 | |
1136 | unsigned f = 0; |
1137 | unsigned verb = 1; |
1138 | key_file kf; |
1139 | key *k = 0; |
1140 | sig *s = sigtab; |
1141 | const gchash *gch = &rmd160; |
1142 | dstr d = DSTR_INIT; |
1143 | ghash *h; |
1144 | FILE *fp; |
1145 | block b; |
1146 | int e; |
1147 | |
1148 | /* --- Parse the options --- */ |
1149 | |
1150 | for (;;) { |
1151 | static struct option opts[] = { |
1152 | { "verbose", 0, 0, 'v' }, |
1153 | { "quiet", 0, 0, 'q' }, |
1154 | { 0, 0, 0, 0 } |
1155 | }; |
1156 | int i = mdwopt(argc, argv, "+vq", opts, 0, 0, 0); |
1157 | if (i < 0) |
1158 | break; |
1159 | switch (i) { |
1160 | case 'v': |
1161 | verb++; |
1162 | break; |
1163 | case 'q': |
1164 | if (verb) |
1165 | verb--; |
1166 | break; |
1167 | default: |
1168 | f |= f_bogus; |
1169 | break; |
1170 | } |
1171 | } |
1172 | argc -= optind; |
1173 | argv += optind; |
1174 | if ((f & f_bogus) || argc > 1) |
1175 | die(EXIT_FAILURE, "Usage: verify [-qv] [file]"); |
1176 | |
1177 | /* --- Open the key file, and start reading the input file --- */ |
1178 | |
1179 | if (key_open(&kf, keyring, KOPEN_READ, keyreport, 0)) |
1180 | die(EXIT_FAILURE, "couldn't open keyring `%s'\n", keyring); |
1181 | if (argc < 1) |
1182 | fp = stdin; |
1183 | else { |
1184 | if ((fp = fopen(argv[0], "rb")) == 0) { |
1185 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
1186 | argv[0], strerror(errno)); |
1187 | } |
1188 | if (getc(fp) == 0) { |
1189 | ungetc(0, fp); |
1190 | f |= f_bin; |
1191 | } else { |
1192 | fclose(fp); |
1193 | if ((fp = fopen(argv[0], "r")) == 0) { |
1194 | die(EXIT_FAILURE, "couldn't open file `%s': %s\n", |
1195 | argv[0], strerror(errno)); |
1196 | } |
1197 | } |
1198 | } |
1199 | |
1200 | /* --- Read the introductory matter --- */ |
1201 | |
1202 | binit(&b); |
1203 | for (;;) { |
1204 | breset(&b); |
1205 | e = bget(&b, fp, f & f_bin); |
1206 | if (e < 0) |
1207 | die(EXIT_FAILURE, "error reading packet: %s\n", errtab[-e]); |
1208 | if (e >= T_BEGIN) |
1209 | break; |
1210 | switch (e) { |
1211 | case T_IDENT: |
1212 | if (verb > 2) |
1213 | printf("INFO ident: `%s'\n", b.d.buf); |
1214 | break; |
1215 | case T_SIGALG: |
1216 | if ((s = getsig(b.d.buf)) == 0) { |
1217 | if (verb) |
1218 | printf("FAIL unknown signature algorithm `%s'\n", b.d.buf); |
1219 | exit(EXIT_FAILURE); |
1220 | } |
1221 | if (verb > 2) |
1222 | printf("INFO signature algorithm: %s\n", s->name); |
1223 | break; |
1224 | case T_HASHALG: |
1225 | if ((gch = gethash(b.d.buf)) == 0) { |
1226 | if (verb) |
1227 | printf("FAIL unknown hash function `%s'\n", b.d.buf); |
1228 | exit(EXIT_FAILURE); |
1229 | } |
1230 | if (verb > 2) |
1231 | printf("INFO hash function algorithm: %s\n", gch->name); |
1232 | break; |
1233 | case T_KEYID: |
1234 | if ((k = key_byid(&kf, b.k)) == 0) { |
1235 | if (verb) |
1236 | printf("FAIL key %08lx not found\n", (unsigned long)b.k); |
1237 | exit(EXIT_FAILURE); |
1238 | } |
1239 | if (verb > 2) { |
1240 | DRESET(&b.d); |
1241 | key_fulltag(k, &b.d); |
1242 | printf("INFO key: %s\n", b.d.buf); |
1243 | } |
1244 | break; |
1245 | default: |
1246 | die(EXIT_FAILURE, "(internal) unknown packet type\n"); |
1247 | break; |
1248 | } |
1249 | } |
1250 | |
1251 | /* --- Initialize the hash function and start reading hashed packets --- */ |
1252 | |
1253 | h = gch->init(); |
1254 | if (!k) { |
1255 | if (verb) |
1256 | puts("FAIL no keyid packet found"); |
1257 | exit(EXIT_FAILURE); |
1258 | } |
1259 | for (;;) { |
1260 | switch (e) { |
1261 | case T_COMMENT: |
1262 | if (verb > 1) |
1263 | printf("INFO comment: `%s'\n", b.d.buf); |
1264 | bemit(&b, 0, h, 0); |
1265 | break; |
1266 | case T_DATE: |
1267 | if (verb > 2) { |
1268 | DRESET(&b.d); |
1269 | timestring(b.t, &b.d); |
1270 | printf("INFO date: %s\n", b.d.buf); |
1271 | } |
1272 | bemit(&b, 0, h, 0); |
1273 | break; |
1274 | case T_EXPIRE: { |
1275 | time_t now = time(0); |
1276 | if (b.t < now) { |
1277 | if (verb > 1) |
1278 | puts("BAD signature has expired"); |
1279 | f |= f_bogus; |
1280 | } |
1281 | if (verb > 2) { |
1282 | DRESET(&b.d); |
1283 | timestring(b.t, &b.d); |
1284 | printf("INFO expires: %s\n", b.d.buf); |
1285 | } |
1286 | bemit(&b, 0, h, 0); |
1287 | } break; |
1288 | case T_FILE: |
1289 | DRESET(&d); |
1290 | DENSURE(&d, gch->hashsz); |
1291 | if (fhash(gch, b.d.buf, d.buf)) { |
1292 | if (verb > 1) { |
1293 | printf("BAD error reading file `%s': %s\n", |
1294 | b.d.buf, strerror(errno)); |
1295 | } |
1296 | f |= f_bogus; |
1297 | } else if (b.b.len != gch->hashsz || |
1298 | memcmp(d.buf, b.b.buf, b.b.len) != 0) { |
1299 | if (verb > 1) |
1300 | printf("BAD file `%s' has incorrect hash\n", b.d.buf); |
1301 | f |= f_bogus; |
1302 | } else if (verb > 3) { |
1303 | fputs("INFO hash: ", stdout); |
1304 | fhex(stdout, b.b.buf, b.b.len); |
1305 | printf(" %s\n", b.d.buf); |
1306 | } |
1307 | bemit(&b, 0, h, 0); |
1308 | break; |
1309 | case T_SIGNATURE: |
1310 | DRESET(&b.d); |
1311 | DENSURE(&b.d, h->ops->c->hashsz); |
1312 | b.d.len += h->ops->c->hashsz; |
1313 | h->ops->done(h, b.d.buf); |
1314 | e = s->verify(k, b.d.buf, b.d.len, b.b.buf, b.b.len); |
1315 | if (e != 1) { |
1316 | if (verb > 1) { |
1317 | if (e < 0) { |
1318 | printf("BAD error unpacking key: %s\n", key_strerror(e)); |
1319 | } else |
1320 | puts("BAD bad signature"); |
1321 | } |
1322 | f |= f_bogus; |
1323 | } else if (verb > 2) |
1324 | puts("INFO good signature"); |
1325 | goto done; |
1326 | default: |
1327 | if (verb) |
1328 | printf("FAIL invalid packet type %i\n", e); |
1329 | exit(EXIT_FAILURE); |
1330 | break; |
1331 | } |
1332 | breset(&b); |
1333 | e = bget(&b, fp, f & f_bin); |
1334 | if (e < 0) { |
1335 | if (verb) |
1336 | printf("FAIL error reading packet: %s\n", errtab[-e]); |
1337 | exit(EXIT_FAILURE); |
1338 | } |
1339 | } |
1340 | done: |
1341 | bdestroy(&b); |
1342 | dstr_destroy(&d); |
1343 | key_close(&kf); |
1344 | if (fp != stdin) |
1345 | fclose(fp); |
1346 | if (verb) { |
1347 | if (f & f_bogus) |
1348 | puts("FAIL signature invalid"); |
1349 | else |
1350 | puts("OK signature verified"); |
1351 | } |
1352 | return (f & f_bogus ? EXIT_FAILURE : EXIT_SUCCESS); |
1353 | } |
1354 | |
1355 | /*----- Main code ---------------------------------------------------------*/ |
1356 | |
1357 | typedef struct cmd { |
1358 | const char *name; |
1359 | int (*func)(int /*argc*/, char */*argv*/[]); |
1360 | const char *help; |
1361 | } cmd; |
1362 | |
1363 | static cmd cmdtab[] = { |
1364 | /* { "manifest", manifest, */ |
1365 | /* "manifest [-0] [-o output]" }, */ |
1366 | { "sign", sign, |
1367 | "sign [-options]\n\ |
1368 | [-0v] [-a alg] [-h hash] [-t keytype] [-i keyid]\n\ |
1369 | [-e expire] [-f file] [-o output]" }, |
1370 | { "verify", verify, |
1371 | "verify [-qv] [file]" }, |
1372 | { 0, 0, 0 } |
1373 | }; |
1374 | |
1375 | static void version(FILE *fp) |
1376 | { |
1377 | pquis(fp, "$, Catacomb version " VERSION "\n"); |
1378 | } |
1379 | |
1380 | static void usage(FILE *fp) |
1381 | { |
1382 | pquis(fp, "Usage: $ [-k keyring] command [args]\n"); |
1383 | } |
1384 | |
1385 | static void help(FILE *fp) |
1386 | { |
1387 | cmd *c; |
1388 | version(fp); |
1389 | fputc('\n', fp); |
1390 | usage(fp); |
1391 | fputs("\n\ |
1392 | Create and verify signatures on lists of files.\n\ |
1393 | \n", fp); |
1394 | for (c = cmdtab; c->name; c++) |
1395 | fprintf(fp, "%s\n", c->help); |
1396 | } |
1397 | |
1398 | /* --- @main@ --- * |
1399 | * |
1400 | * Arguments: @int argc@ = number of command line arguments |
1401 | * @char *argv[]@ = vector of command line arguments |
1402 | * |
1403 | * Returns: Zero if successful, nonzero otherwise. |
1404 | * |
1405 | * Use: Signs or verifies signatures on lists of files. Useful for |
1406 | * ensuring that a distribution is unmolested. |
1407 | */ |
1408 | |
1409 | int main(int argc, char *argv[]) |
1410 | { |
1411 | unsigned f = 0; |
1412 | cmd *c = 0, *cc = 0; |
1413 | size_t n; |
1414 | |
1415 | enum { |
1416 | f_bogus = 1 |
1417 | }; |
1418 | |
1419 | /* --- Initialize the library --- */ |
1420 | |
1421 | ego(argv[0]); |
1422 | sub_init(); |
1423 | rand_noisesrc(RAND_GLOBAL, &noise_source); |
1424 | rand_seed(RAND_GLOBAL, 160); |
1425 | |
1426 | /* --- Parse options --- */ |
1427 | |
1428 | for (;;) { |
1429 | static struct option opts[] = { |
1430 | { "help", 0, 0, 'h' }, |
1431 | { "version", 0, 0, 'v' }, |
1432 | { "usage", 0, 0, 'u' }, |
1433 | { "keyring", OPTF_ARGREQ, 0, 'k' }, |
1434 | { 0, 0, 0, 0 } |
1435 | }; |
1436 | int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0); |
1437 | if (i < 0) |
1438 | break; |
1439 | switch (i) { |
1440 | case 'h': |
1441 | help(stdout); |
1442 | exit(0); |
1443 | break; |
1444 | case 'v': |
1445 | version(stdout); |
1446 | exit(0); |
1447 | break; |
1448 | case 'u': |
1449 | usage(stdout); |
1450 | exit(0); |
1451 | case 'k': |
1452 | keyring = optarg; |
1453 | break; |
1454 | default: |
1455 | f |= f_bogus; |
1456 | break; |
1457 | } |
1458 | } |
1459 | |
1460 | argc -= optind; |
1461 | argv += optind; |
1462 | optind = 0; |
1463 | if (f & f_bogus || argc < 1) { |
1464 | usage(stderr); |
1465 | exit(EXIT_FAILURE); |
1466 | } |
1467 | |
1468 | /* --- Dispatch to the correct subcommand handler --- */ |
1469 | |
1470 | n = strlen(argv[0]); |
1471 | for (c = cmdtab; c->name; c++) { |
1472 | if (strncmp(argv[0], c->name, n) == 0) { |
1473 | if (c->name[n] == 0) { |
1474 | cc = c; |
1475 | break; |
1476 | } else if (cc) |
1477 | die(EXIT_FAILURE, "ambiguous command name `%s'", argv[0]); |
1478 | else |
1479 | cc = c; |
1480 | } |
1481 | } |
1482 | if (!cc) |
1483 | die(EXIT_FAILURE, "unknown command `%s'", argv[0]); |
1484 | return (cc->func(argc, argv)); |
1485 | } |
1486 | |
1487 | /*----- That's all, folks -------------------------------------------------*/ |