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progs/catsign.c: Remove old debugging code.
[u/mdw/catacomb] / progs / catsign.c
1 /* -*-c-*-
2 *
3 * Sign files
4 *
5 * (c) 2005 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 #include <time.h>
40
41 #include <mLib/base64.h>
42 #include <mLib/dstr.h>
43 #include <mLib/mdwopt.h>
44 #include <mLib/quis.h>
45 #include <mLib/report.h>
46 #include <mLib/sub.h>
47
48 #include "buf.h"
49 #include "rand.h"
50 #include "noise.h"
51 #include "mprand.h"
52 #include "key.h"
53 #include "getdate.h"
54 #include "cc.h"
55
56 #include "ectab.h"
57 #include "ptab.h"
58
59 /*----- Static variables --------------------------------------------------*/
60
61 static const char *keyring = "keyring";
62
63 /*----- Data formats ------------------------------------------------------*
64 *
65 * Our crypto stuff is split into three parts: a header describing the key,
66 * the message itself, and the signature. In a detached signature, the
67 * message is separate, and the header and signature are combined into one
68 * encoded chunk. In an attached signature, the message is included. There
69 * are two forms of message: binary and text. Binary messages are divided
70 * into chunks, each preceded by a 2-octet length, and terminated by a
71 * zero-length chunk. Text messages are byte-stuffed, as for RFC821, and
72 * trailing whitespace before a newline is ignored.
73 */
74
75 typedef struct sigmsg {
76 unsigned f; /* Flags */
77 #define F_DETACH 1u
78 #define F_BINARY 2u
79 #define F_SIGMASK 3u
80 #define F_HASHMASK (F_BINARY)
81 uint32 keyid; /* Key identifier */
82 time_t t; /* When the signature was made */
83 dstr kh; /* Key fingerprint (sanity check) */
84 dstr sig; /* Signature */
85 sig *s; /* Signature algorithm */
86 } sigmsg;
87
88 #define F_MIDLINE 16u
89 #define F_EOF 32u
90 #define F_NOCLOSE 64u
91 #define F_BOGUS 128u
92 #define F_BUFFER 256u
93 #define F_UTC 512u
94 #define F_NOCHECK 1024u
95 #define F_PROGRESS 2048u
96
97 /*----- Chunk I/O ---------------------------------------------------------*/
98
99 static void chunk_write(enc *e, const void *p, size_t n)
100 {
101 octet b[2];
102
103 assert(n <= 0xffff);
104 STORE16(b, n);
105 if (e->ops->write(e, b, 2) || e->ops->write(e, p, n))
106 die(EXIT_FAILURE, "error writing output: %s", strerror(errno));
107 }
108
109 static size_t chunk_read(enc *e, void *p)
110 {
111 octet b[2];
112 size_t n;
113
114 if (e->ops->read(e, b, 2) != 2)
115 goto err;
116 n = LOAD16(b);
117 if (n && e->ops->read(e, p, n) != n)
118 goto err;
119 return (n);
120
121 err:
122 if (!errno) die(EXIT_FAILURE, "unexpected end-of-file on input");
123 else die(EXIT_FAILURE, "error reading input: %s", strerror(errno));
124 return (0);
125 }
126
127 /*----- Message canonification --------------------------------------------*/
128
129 #define MSGBUFSZ 65536
130 #define MSGBUFTHRESH 32768
131
132 typedef struct msgcanon {
133 unsigned f;
134 FILE *fp;
135 enc *e;
136 fprogress ff;
137 size_t (*read)(struct msgcanon *, void *);
138 void (*write)(struct msgcanon *, const void *, size_t);
139 void (*close)(struct msgcanon *);
140 } msgcanon;
141
142 #define MC_INIT { 0 }
143
144 static size_t textread(msgcanon *m, void *bp)
145 {
146 size_t n = 0, nsp = 0;
147 int ch;
148 char *b = bp;
149 unsigned f = m->f;
150
151 if (f & F_EOF) return (0);
152 for (;;) {
153 if ((ch = getc(m->fp)) == EOF) goto eof;
154 if (!(f & (F_DETACH | F_MIDLINE)) && ch == '.') {
155 ch = getc(m->fp);
156 if (ch == '\n') goto eof;
157 }
158 if (ch == '\n') {
159 n -= nsp; nsp = 0;
160 if (n >= MSGBUFTHRESH) goto full;
161 b[n++] = ch;
162 f &= ~F_MIDLINE;
163 } else if (isspace(ch)) {
164 f |= F_MIDLINE;
165 if (n >= MSGBUFSZ) goto full;
166 b[n++] = ch; nsp++;
167 } else {
168 f |= F_MIDLINE;
169 nsp = 0;
170 if (n >= MSGBUFTHRESH) goto full;
171 b[n++] = ch;
172 }
173 }
174 eof:
175 f |= F_EOF;
176 goto done;
177 full:
178 ungetc(ch, m->fp);
179 done:
180 m->f = f;
181 if (m->f & F_PROGRESS) fprogress_update(&m->ff, n);
182 return (n);
183 }
184
185 static void textwrite(msgcanon *m, const void *bp, size_t n)
186 {
187 const char *p = bp, *l = p + n;
188 unsigned f = m->f;
189
190 while (p < l) {
191 if (!(f & (F_MIDLINE | F_DETACH)) &&
192 (*p == '.' || *p == '-'))
193 putc('.', m->fp);
194 if (*p == '\n') f &= ~F_MIDLINE;
195 else f |= F_MIDLINE;
196 putc(*p, m->fp);
197 p++;
198 }
199 m->f = f;
200 }
201
202 static size_t binreadembed(msgcanon *m, void *bp)
203 {
204 size_t n = chunk_read(m->e, bp);
205 if (m->f & F_PROGRESS) fprogress_update(&m->ff, n);
206 return (n);
207 }
208
209 static size_t binreaddetach(msgcanon *m, void *bp)
210 {
211 size_t n = fread(bp, 1, MSGBUFSZ - 1, m->fp);
212 if (m->f & F_PROGRESS) fprogress_update(&m->ff, n);
213 return (n);
214 }
215
216 static void binwriteembed(msgcanon *m, const void *bp, size_t n)
217 { chunk_write(m->e, bp, n); }
218
219 static void nullwrite(msgcanon *m, const void *bp, size_t n) { ; }
220
221 static void mcsetup_readfile(msgcanon *m, unsigned f, const char *fn)
222 {
223 m->f = F_DETACH | (f & (F_BINARY | F_PROGRESS));
224 if (!fn || strcmp(fn, "-") == 0) {
225 m->fp = stdin;
226 m->f |= F_NOCLOSE;
227 } else if ((m->fp = fopen(fn, (f & F_BINARY) ? "rb" : "r")) == 0)
228 die(EXIT_FAILURE, "couldn't open file `%s': %s", fn, strerror(errno));
229 if (m->f & F_PROGRESS) {
230 if (fprogress_init(&m->ff, fn, m->fp)) {
231 die(EXIT_FAILURE, "failed to initialize progress indicator: %s",
232 strerror(errno));
233 }
234 }
235 m->read = (f & F_BINARY) ? binreaddetach : textread;
236 }
237
238 static void mcsetup_writenull(msgcanon *m) { m->write = nullwrite; }
239
240 static void mcsetup_read(msgcanon *m, unsigned f, enc **ee,
241 const char *fn, const char *dfn)
242 {
243 enc *e = *ee;
244
245 m->f = f | F_NOCLOSE;
246
247 if (dfn && !(f & F_DETACH)) die(EXIT_FAILURE, "signature is not detached");
248 if (f & F_BINARY) {
249 if (!(f & F_DETACH)) {
250 m->e = e;
251 *ee = 0;
252 m->fp = e->fp;
253 m->read = binreadembed;
254 if (m->f & F_PROGRESS) {
255 if (fprogress_init(&m->ff, fn, m->fp)) {
256 die(EXIT_FAILURE, "failed to initialize progress indicator: %s",
257 strerror(errno));
258 }
259 }
260 } else {
261 m->read = binreaddetach;
262 if (!dfn || strcmp(dfn, "-") == 0)
263 m->fp = stdin;
264 else if ((m->fp = fopen(dfn, "rb")) == 0)
265 die(EXIT_FAILURE, "can't open `%s': %s", dfn, strerror(errno));
266 else
267 m->f &= ~F_NOCLOSE;
268 if (m->f & F_PROGRESS) {
269 if (fprogress_init(&m->ff, dfn, m->fp)) {
270 die(EXIT_FAILURE, "failed to initialize progress indicator: %s",
271 strerror(errno));
272 }
273 }
274 }
275 } else {
276 m->read = textread;
277 if (!(f & F_DETACH)) {
278 if (e->ops->decdone(e) || ferror(e->fp))
279 die(EXIT_FAILURE, "error at end of signature header");
280 m->fp = e->fp;
281 e->ops->destroy(e);
282 *ee = 0;
283 if (m->f & F_PROGRESS) {
284 if (fprogress_init(&m->ff, fn, m->fp)) {
285 die(EXIT_FAILURE, "failed to initialize progress indicator: %s",
286 strerror(errno));
287 }
288 }
289 } else {
290 if (!dfn || strcmp(dfn, "-") == 0)
291 m->fp = stdin;
292 else if ((m->fp = fopen(dfn, "r")) == 0)
293 die(EXIT_FAILURE, "can't read file `%s': %s", dfn, strerror(errno));
294 else
295 m->f &= ~F_NOCLOSE;
296 if (m->f & F_PROGRESS) {
297 if (fprogress_init(&m->ff, dfn, m->fp)) {
298 die(EXIT_FAILURE, "failed to initialize progress indicator: %s",
299 strerror(errno));
300 }
301 }
302 }
303 }
304 }
305
306 static void mcsetup_write(msgcanon *m, unsigned f, enc **ee)
307 {
308 enc *e = *ee;
309
310 m->f = f | F_NOCLOSE;
311
312 if (f & F_DETACH)
313 m->write = nullwrite;
314 else if (f & F_BINARY) {
315 m->e = e;
316 *ee = 0;
317 m->fp = e->fp;
318 m->write = binwriteembed;
319 } else {
320 if (e->ops->encdone(e) || ferror(e->fp))
321 die(EXIT_FAILURE, "error at end of signature header");
322 m->fp = e->fp;
323 e->ops->destroy(e);
324 *ee = 0;
325 m->write = textwrite;
326 }
327 }
328
329 static void mc_endread(msgcanon *m, const encops *eops, enc **ee)
330 {
331 if (!(m->f & F_DETACH)) {
332 if (m->f & F_BINARY)
333 *ee = m->e;
334 else
335 *ee = initdec(eops, m->fp, checkbdry, "CATSIGN SIGNATURE");
336 }
337 if (m->fp && !(m->f & F_NOCLOSE)) {
338 if (ferror(m->fp) || fclose(m->fp))
339 die(EXIT_FAILURE, "error closing message file: %s", strerror(errno));
340 }
341 if (m->f & F_PROGRESS) fprogress_done(&m->ff);
342 }
343
344 static void mc_endwrite(msgcanon *m, const encops *eops, enc **ee)
345 {
346 if (!(m->f & F_BINARY)) {
347 if (m->f & F_MIDLINE) putc('\n', m->fp);
348 if (!(m->f & F_DETACH)) {
349 putc('.', m->fp); putc('\n', m->fp);
350 *ee = initenc(eops, m->fp, "CATSIGN SIGNATURE");
351 }
352 } else if (!(m->f & F_DETACH)) {
353 chunk_write(m->e, 0, 0);
354 *ee = m->e;
355 }
356 if (m->fp && !(m->f & F_NOCLOSE)) {
357 if (fflush(m->fp) || ferror(m->fp) || fclose(m->fp))
358 die(EXIT_FAILURE, "error closing message file: %s", strerror(errno));
359 }
360 }
361
362 /*----- Signature reading and writing -------------------------------------*/
363
364 static void sig_init(sigmsg *s, unsigned f, uint32 keyid)
365 {
366 s->f = f & F_SIGMASK;
367 s->keyid = keyid;
368 time(&s->t);
369 s->s = 0;
370 dstr_create(&s->kh);
371 dstr_create(&s->sig);
372 }
373
374 static void sig_destroy(sigmsg *s)
375 {
376 dstr_destroy(&s->kh);
377 dstr_destroy(&s->sig);
378 if (s->s) freesig(s->s);
379 }
380
381 static void sigtobuffer(sigmsg *s, buf *b, int hashp)
382 {
383 kludge64 t;
384
385 ASSIGN64(t, s->t);
386 if (hashp) buf_putu16(b, s->f & F_HASHMASK);
387 else buf_putu16(b, s->f & F_SIGMASK);
388 buf_putu32(b, s->keyid);
389 buf_putu32(b, HI64(t));
390 buf_putu32(b, LO64(t));
391 buf_putdstr16(b, &s->kh);
392 assert(BOK(b));
393 }
394
395 static void dohash(ghash *h, const void *p, size_t n)
396 {
397 GH_HASH(h, p, n);
398 }
399
400 static void sig_hash(sigmsg *s)
401 {
402 octet bb[16384];
403 buf b;
404
405 buf_init(&b, bb, sizeof(bb));
406 sigtobuffer(s, &b, 1);
407 dohash(s->s->h, BBASE(&b), BLEN(&b));
408 }
409
410 static void keyhash(key *k, sig *s, dstr *d)
411 {
412 ghash *h;
413 key_filter kf;
414
415 h = GH_INIT(s->ch);
416 kf.f = KCAT_PUB;
417 kf.m = KF_CATMASK;
418 key_fingerprint(k, h, &kf);
419 dstr_ensure(d, GH_CLASS(h)->hashsz);
420 GH_DONE(h, d->buf + d->len);
421 d->len += GH_CLASS(h)->hashsz;
422 GH_DESTROY(h);
423 }
424
425 static void sig_writeheader(enc *e, sigmsg *s)
426 {
427 octet bb[16384];
428 buf b;
429
430 buf_init(&b, bb, sizeof(bb));
431 sigtobuffer(s, &b, 0);
432 chunk_write(e, BBASE(&b), BLEN(&b));
433 }
434
435 static void sig_writesig(enc *e, sigmsg *s)
436 { chunk_write(e, s->sig.buf, s->sig.len); }
437
438 static void diechoke(const char *m, void *p)
439 { die(EXIT_FAILURE, "%s%s%s", (const char *)p, p ? ": " : "", m); }
440
441 static void sig_readheader(enc *e, sigmsg *s,
442 void (*choke)(const char *, void *), void *p)
443 {
444 uint16 f;
445 octet bb[MSGBUFSZ];
446 uint32 x, y;
447 kludge64 t;
448 buf b;
449 size_t n;
450
451 n = chunk_read(e, bb);
452 buf_init(&b, bb, n);
453 if (buf_getu16(&b, &f)) choke("missing flags", p);
454 if (buf_getu32(&b, &x)) choke("missing keyid", p);
455 sig_init(s, f, x);
456 if (buf_getu32(&b, &x) || buf_getu32(&b, &y))
457 choke("missing datestamp", p);
458 SET64(t, x, y); s->t = GET64(time_t, t);
459 if (buf_getdstr16(&b, &s->kh))
460 choke("missing key hash", p);
461 if (BLEFT(&b))
462 choke("junk at end", p);
463 }
464
465 static void sig_readsig(enc *e, sigmsg *s)
466 {
467 octet bb[MSGBUFSZ];
468 size_t n;
469
470 n = chunk_read(e, bb);
471 dstr_putm(&s->sig, bb, n);
472 }
473
474 /*----- Signing -----------------------------------------------------------*/
475
476 static int sign(int argc, char *argv[])
477 {
478 const char *ef = "binary", *fn = 0, *of = 0, *kn = "ccsig", *err;
479 unsigned f = 0;
480 key_file kf;
481 key *k;
482 sigmsg s;
483 FILE *ofp = 0;
484 int i;
485 char bb[MSGBUFSZ];
486 size_t n;
487 dstr d = DSTR_INIT;
488 const encops *eo;
489 msgcanon mc_in = MC_INIT, mc_out = MC_INIT;
490 enc *e;
491
492 for (;;) {
493 static const struct option opt[] = {
494 { "armour", 0, 0, 'a' },
495 { "armor", 0, 0, 'a' },
496 { "binary", 0, 0, 'b' },
497 { "detach", 0, 0, 'd' },
498 { "key", OPTF_ARGREQ, 0, 'k' },
499 { "format", OPTF_ARGREQ, 0, 'f' },
500 { "output", OPTF_ARGREQ, 0, 'o' },
501 { "progress", 0, 0, 'p' },
502 { "text", 0, 0, 't' },
503 { "nocheck", 0, 0, 'C' },
504 { 0, 0, 0, 0 }
505 };
506 i = mdwopt(argc, argv, "k:f:o:abdptC", opt, 0, 0, 0);
507 if (i < 0) break;
508 switch (i) {
509 case 'k': kn = optarg; break;
510 case 'f': ef = optarg; break;
511 case 'o': of = optarg; break;
512 case 'a': ef = "pem"; break;
513 case 't': f &= ~F_BINARY; break;
514 case 'b': f |= F_BINARY; break;
515 case 'd': f |= F_DETACH; break;
516 case 'C': f |= F_NOCHECK; break;
517 case 'p': f |= F_PROGRESS; break;
518 default: f |= F_BOGUS; break;
519 }
520 }
521 if (argc - optind > 1 || (f & F_BOGUS))
522 die(EXIT_FAILURE, "Usage: sign [-OPTIONS] [FILE]");
523
524 if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0))
525 die(EXIT_FAILURE, "can't open keyring `%s'", keyring);
526 if ((k = key_bytag(&kf, kn)) == 0)
527 die(EXIT_FAILURE, "key `%s' not found", kn);
528
529 if ((eo = getenc(ef)) == 0)
530 die(EXIT_FAILURE, "encoding `%s' not found", ef);
531
532 fn = (optind >= argc) ? 0 : argv[optind++];
533
534 if (!of || strcmp(of, "-") == 0)
535 ofp = stdout;
536 else if ((ofp = fopen(of, eo->wmode)) == 0) {
537 die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
538 of, strerror(errno));
539 }
540
541 /* --- Start the work --- */
542
543 sig_init(&s, f, k->id);
544 dstr_reset(&d);
545 key_fulltag(k, &d);
546 s.s = getsig(k, "ccsig", 1);
547 if (!(f & F_NOCHECK) && (err = s.s->ops->check(s.s)) != 0)
548 moan("key %s fails check: %s", d.buf, err);
549 keyhash(k, s.s, &s.kh);
550 e = initenc(eo, ofp,
551 (f & F_DETACH) ? "CATSIGN SIGNATURE" :
552 (f & F_BINARY) ? "CATSIGN MESSAGE" :
553 "CATSIGN MESSAGE HEADER");
554 sig_writeheader(e, &s);
555
556 /* --- Hash the message --- */
557
558 mcsetup_readfile(&mc_in, f, fn);
559 mcsetup_write(&mc_out, f, &e);
560 sig_hash(&s);
561 for (;;) {
562 n = mc_in.read(&mc_in, bb);
563 if (!n) break;
564 dohash(s.s->h, bb, n);
565 mc_out.write(&mc_out, bb, n);
566 }
567 mc_endread(&mc_in, 0, 0);
568 mc_endwrite(&mc_out, eo, &e);
569
570 /* --- Write the signature --- */
571
572 if (s.s->ops->doit(s.s, &s.sig))
573 die(EXIT_FAILURE, "signature failed");
574 sig_writesig(e, &s);
575 e->ops->encdone(e);
576 if (fflush(ofp) || ferror(ofp) || fclose(ofp))
577 die(EXIT_FAILURE, "error writing signature: %s", strerror(errno));
578
579 /* --- All done --- */
580
581 freeenc(e);
582 key_close(&kf);
583 sig_destroy(&s);
584 dstr_destroy(&d);
585 return (0);
586 }
587
588 /*----- Verifying ---------------------------------------------------------*/
589
590 typedef struct vrfctx {
591 unsigned f, m;
592 int verb;
593 const char *what;
594 } vrfctx;
595
596 static int vrfbdry(const char *b, void *p)
597 {
598 vrfctx *v = p;
599
600 if (strcmp(b, "CATSIGN MESSAGE") == 0) {
601 v->f |= F_BINARY;
602 v->m |= F_BINARY | F_DETACH;
603 return (1);
604 } else if (strcmp(b, "CATSIGN MESSAGE HEADER") == 0) {
605 v->m |= F_BINARY | F_DETACH;
606 return (1);
607 } else if (strcmp(b, "CATSIGN SIGNATURE") == 0) {
608 v->f |= F_DETACH;
609 v->m |= F_DETACH;
610 return (1);
611 } else
612 return (0);
613 }
614
615 static void vrfchoke(const char *m, void *p)
616 {
617 vrfctx *v = p;
618 if (v->verb) printf("FAIL %s: %s\n", v->what, m);
619 exit(EXIT_FAILURE);
620 }
621
622 static int verify(int argc, char *argv[])
623 {
624 const char *ef = "binary", *of = 0, *fn, *dfn = 0, *kn = 0, *err;
625 vrfctx v = { 0, 0, 1 };
626 key_file kf;
627 key *k, *kk = 0;
628 sigmsg s;
629 FILE *fp, *ofp = 0, *rfp = 0;
630 fprogress ff;
631 struct tm *tm;
632 int i;
633 char bb[MSGBUFSZ];
634 size_t n;
635 time_t t_fresh = 0;
636 dstr d = DSTR_INIT, dd = DSTR_INIT;
637 const encops *eo;
638 msgcanon mc_in = MC_INIT;
639 enc *e;
640
641 for (;;) {
642 static const struct option opt[] = {
643 { "armour", 0, 0, 'a' },
644 { "armor", 0, 0, 'a' },
645 { "buffer", 0, 0, 'b' },
646 { "key", OPTF_ARGREQ, 0, 'k' },
647 { "format", OPTF_ARGREQ, 0, 'f' },
648 { "output", OPTF_ARGREQ, 0, 'o' },
649 { "progress", 0, 0, 'p' },
650 { "quiet", 0, 0, 'q' },
651 { "utc", 0, 0, 'u' },
652 { "fresh-time", 0, 0, 't' },
653 { "gmt", 0, 0, 'u' },
654 { "verbose", 0, 0, 'v' },
655 { "nocheck", 0, 0, 'C' },
656 { 0, 0, 0, 0 }
657 };
658 i = mdwopt(argc, argv, "k:f:o:abpqt:uvC", opt, 0, 0, 0);
659 if (i < 0) break;
660 switch (i) {
661 case 'a': ef = "pem"; break;
662 case 'b': v.f |= F_BUFFER; break;
663 case 'k': kn = optarg; break;
664 case 'f': ef = optarg; break;
665 case 'o': of = optarg; break;
666 case 'u': v.f |= F_UTC; break;
667 case 'C': v.f |= F_NOCHECK; break;
668 case 't':
669 if (strcmp(optarg, "always") == 0) t_fresh = 0;
670 else if ((t_fresh = get_date(optarg, 0)) < 0)
671 die(EXIT_FAILURE, "bad freshness time");
672 break;
673 case 'q': if (v.verb > 0) v.verb--; break;
674 case 'v': if (v.verb < 10) v.verb++; break;
675 case 'p': v.f |= F_PROGRESS; break;
676 default: v.f |= F_BOGUS; break;
677 }
678 }
679 if (argc - optind > 2 || (v.f & F_BOGUS))
680 die(EXIT_FAILURE, "Usage: verify [-OPTIONS] [FILE [MESSAGE]]");
681
682 if ((eo = getenc(ef)) == 0)
683 die(EXIT_FAILURE, "encoding `%s' not found", ef);
684
685 fn = optind < argc ? argv[optind++] : "-";
686 if (strcmp(fn, "-") == 0)
687 fp = stdin;
688 else if ((fp = fopen(fn, eo->rmode)) == 0) {
689 die(EXIT_FAILURE, "couldn't open file `%s': %s",
690 fn, strerror(errno));
691 }
692
693 if (key_open(&kf, keyring, KOPEN_READ, key_moan, 0))
694 die(EXIT_FAILURE, "can't open keyring `%s'", keyring);
695 if (kn && (kk = key_bytag(&kf, kn)) == 0)
696 die(EXIT_FAILURE, "key `%s' not found", kn);
697
698 e = initdec(eo, fp, vrfbdry, &v);
699
700 /* --- Read the header chunk --- */
701
702 v.what = "malformed header";
703 sig_readheader(e, &s, vrfchoke, &v);
704
705 if (((s.f ^ v.f) & v.m) != 0) {
706 if (v.verb) printf("FAIL boundary string inconsistent with contents\n");
707 exit(EXIT_FAILURE);
708 }
709 v.f |= s.f;
710
711 if ((k = key_byid(&kf, s.keyid)) == 0) {
712 if (v.verb) printf("FAIL key id %08lx not found\n",
713 (unsigned long)s.keyid);
714 exit(EXIT_FAILURE);
715 }
716 if (kk && k->id != kk->id) {
717 if (v.verb) {
718 dstr_reset(&d); key_fulltag(k, &d);
719 dstr_reset(&dd); key_fulltag(kk, &dd);
720 printf("FAIL signing key is %s; expected key %s\n", d.buf, dd.buf);
721 }
722 exit(EXIT_FAILURE);
723 }
724
725 s.s = getsig(k, "ccsig", 0);
726 dstr_reset(&d); key_fulltag(k, &d);
727 if (!(v.f & F_NOCHECK) && v.verb && (err = s.s->ops->check(s.s)) != 0)
728 printf("WARN verification key %s fails check: %s\n", d.buf, err);
729
730 dstr_reset(&dd); keyhash(k, s.s, &dd);
731 if (dd.len != s.kh.len || memcmp(dd.buf, s.kh.buf, dd.len) != 0) {
732 if (v.verb) printf("FAIL key hash mismatch\n");
733 exit(EXIT_FAILURE);
734 }
735
736 /* --- Now a merry dance --- */
737
738 if (v.f & F_DETACH)
739 sig_readsig(e, &s);
740 if (optind < argc)
741 dfn = argv[optind++];
742 mcsetup_read(&mc_in, v.f, &e, fn, dfn);
743
744 if (!of && (v.f & F_DETACH)) {
745 rfp = ofp = 0;
746 v.f &= ~F_BUFFER;
747 } else if (!of || strcmp(of, "-") == 0) {
748 v.f |= F_BUFFER;
749 ofp = stdout;
750 }
751 if (of && !(v.f & F_BUFFER)) {
752 if ((ofp = fopen(of, (v.f & F_BINARY) ? "wb" : "w")) == 0) {
753 die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
754 of, strerror(errno));
755 }
756 rfp = ofp;
757 } else if ((rfp = tmpfile()) == 0)
758 die(EXIT_FAILURE, "couldn't create temporary file: %s", strerror(errno));
759
760 /* --- Read the message and verify the signature --- */
761
762 sig_hash(&s);
763 for (;;) {
764 n = mc_in.read(&mc_in, bb);
765 if (!n) break;
766 dohash(s.s->h, bb, n);
767 if (rfp) fwrite(bb, 1, n, rfp);
768 }
769 mc_endread(&mc_in, eo, &e);
770 if (!(v.f & F_DETACH))
771 sig_readsig(e, &s);
772 if (rfp && (ferror(rfp) || fflush(rfp))) {
773 if (v.verb) printf("FAIL error writing message: %s\n", strerror(errno));
774 exit(EXIT_FAILURE);
775 }
776
777 /* --- Check the signature --- */
778
779 if (s.s->ops->doit(s.s, &s.sig)) {
780 if (v.verb) printf("FAIL signature verification failed\n");
781 exit(EXIT_FAILURE);
782 }
783 if (t_fresh && s.t < t_fresh) {
784 if (v.verb) printf("FAIL signature is stale\n");
785 exit(EXIT_FAILURE);
786 }
787 if (s.t > time(0)) {
788 if (v.verb) printf("FAIL signature timestamp in the future\n");
789 exit(EXIT_FAILURE);
790 }
791 if (v.verb) {
792 tm = (v.f & F_UTC) ? gmtime(&s.t) : localtime(&s.t);
793 strftime(bb, sizeof(bb), "%Y-%m-%d %H:%M:%S %Z", tm);
794 printf("INFO good-signature %s\n", d.buf);
795 printf("INFO date %s\n", bb);
796 }
797
798 /* --- Unbuffer buffered input --- */
799
800 if (v.f & F_BUFFER) {
801 if (!ofp && (ofp = fopen(of, "wb")) == 0) {
802 die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
803 of, strerror(errno));
804 }
805 rewind(rfp);
806 if (v.f & F_PROGRESS) fprogress_init(&ff, "copying buffer", rfp);
807 if (v.verb && ofp == stdout) printf("DATA\n");
808 for (;;) {
809 n = fread(bb, 1, sizeof(bb), rfp);
810 if (!n) break;
811 if (v.f & F_PROGRESS) fprogress_update(&ff, n);
812 if (fwrite(bb, 1, n, ofp) < n) {
813 if (v.f & F_PROGRESS) fprogress_done(&ff);
814 die(EXIT_FAILURE, "error writing output: %s", strerror(errno));
815 }
816 }
817 if (v.f & F_PROGRESS) fprogress_done(&ff);
818 if (ferror(rfp) || fclose(rfp))
819 die(EXIT_FAILURE, "error unbuffering output: %s", strerror(errno));
820 }
821 if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp)))
822 die(EXIT_FAILURE, "error writing output: %s", strerror(errno));
823
824 /* --- Tidy up --- */
825
826 e->ops->decdone(e);
827 if (v.verb && ofp != stdout)
828 printf("OK verified successfully\n");
829 freeenc(e);
830 key_close(&kf);
831 sig_destroy(&s);
832 dstr_destroy(&d);
833 dstr_destroy(&dd);
834 return (0);
835 }
836
837 /*----- Reformatting ------------------------------------------------------*/
838
839 static int format(int argc, char *argv[])
840 {
841 const char *ief = "binary", *oef = "binary";
842 const char *fn, *dfn = 0, *of = 0, *mf = 0;
843 sigmsg s;
844 FILE *fp, *ofp = 0, *mfp = 0;
845 int i;
846 size_t n;
847 msgcanon mc_in = MC_INIT, mc_out = MC_INIT;
848 char bb[MSGBUFSZ];
849 vrfctx v = { 0, 0, 1 };
850 unsigned f = 0, fm = ~F_SIGMASK, sf;
851 const encops *ieo, *oeo;
852 enc *ie, *oe;
853
854 for (;;) {
855 static const struct option opt[] = {
856 { "armour-in", 0, 0, 'a' },
857 { "armor-in", 0, 0, 'a' },
858 { "armour-out", 0, 0, 'A' },
859 { "armor-out", 0, 0, 'A' },
860 { "detach", 0, 0, 'D' },
861 { "embed", 0, 0, 'E' },
862 { "format-in", OPTF_ARGREQ, 0, 'f' },
863 { "format-out", OPTF_ARGREQ, 0, 'F' },
864 { "message", OPTF_ARGREQ, 0, 'm' },
865 { "output", OPTF_ARGREQ, 0, 'o' },
866 { "progress", 0, 0, 'p' },
867 { 0, 0, 0, 0 }
868 };
869 i = mdwopt(argc, argv, "f:F:m:o:apADE", opt, 0, 0, 0);
870 if (i < 0) break;
871 switch (i) {
872 case 'a': ief = "pem"; break;
873 case 'A': oef = "pem"; break;
874 case 'f': ief = optarg; break;
875 case 'F': oef = optarg; break;
876 case 'D': f |= F_DETACH; fm |= F_DETACH; break;
877 case 'E': f &= ~F_DETACH; fm |= F_DETACH; break;
878 case 'm': mf = optarg; break;
879 case 'o': of = optarg; break;
880 case 'p': f |= F_PROGRESS; break;
881 default: f |= F_BOGUS; break;
882 }
883 }
884
885 if (argc - optind > 2 || (f & F_BOGUS))
886 die(EXIT_FAILURE, "Usage: format [-OPTIONS] [FILE [MESSAGE]]");
887
888 if ((ieo = getenc(ief)) == 0)
889 die(EXIT_FAILURE, "encoding `%s' not found", ief);
890 if ((oeo = getenc(oef)) == 0)
891 die(EXIT_FAILURE, "encoding `%s' not found", oef);
892
893 fn = optind < argc ? argv[optind++] : "-";
894 if (strcmp(fn, "-") == 0)
895 fp = stdin;
896 else if ((fp = fopen(fn, ieo->rmode)) == 0) {
897 die(EXIT_FAILURE, "couldn't open file `%s': %s",
898 fn, strerror(errno));
899 }
900
901 if (optind < argc)
902 dfn = argv[optind++];
903
904 ie = initdec(ieo, fp, vrfbdry, &v);
905
906 /* --- Read the header chunk --- */
907
908 sig_readheader(ie, &s, diechoke, "malformed header");
909
910 if (((s.f ^ v.f) & v.m) != 0)
911 moan("boundary string inconsistent with contents (ignoring)");
912
913 mcsetup_read(&mc_in, s.f, &ie, fn, dfn);
914
915 /* --- Prepare the output stuff --- */
916
917 if (!of && !mf) of = "-";
918 sf = s.f;
919 f = (f & fm) | (s.f & ~fm);
920 s.f = f & F_SIGMASK;
921
922 if (sf & F_DETACH)
923 sig_readsig(ie, &s);
924
925 if (!of)
926 mcsetup_writenull(&mc_out);
927 else {
928 if (strcmp(of, "-") == 0)
929 ofp = stdout;
930 else if ((ofp = fopen(of, oeo->wmode)) == 0) {
931 die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
932 of, strerror(errno));
933 }
934 oe = initenc(oeo, ofp,
935 (f & F_DETACH) ? "CATSIGN SIGNATURE" :
936 (f & F_BINARY) ? "CATSIGN MESSAGE" :
937 "CATSIGN MESSAGE HEADER");
938 sig_writeheader(oe, &s);
939 mcsetup_write(&mc_out, f, &oe);
940 }
941
942 if (mf) {
943 if (strcmp(mf, "-") == 0)
944 mfp = stdout;
945 else if ((mfp = fopen(mf, (f & F_BINARY) ? "wb" : "w")) == 0) {
946 die(EXIT_FAILURE, "couldn't open file `%s' for output: %s",
947 mf, strerror(errno));
948 }
949 }
950
951 /* --- Wade through the message body --- */
952
953 for (;;) {
954 n = mc_in.read(&mc_in, bb);
955 if (!n) break;
956 mc_out.write(&mc_out, bb, n);
957 if (mfp) fwrite(bb, 1, n, mfp);
958 }
959 mc_endread(&mc_in, ieo, &ie);
960 if (of) mc_endwrite(&mc_out, oeo, &oe);
961
962 /* --- Write the signature --- */
963
964 if (!(sf & F_DETACH))
965 sig_readsig(ie, &s);
966 if (of) {
967 sig_writesig(oe, &s);
968 oe->ops->encdone(oe);
969 }
970
971 /* --- All done --- */
972
973 ie->ops->decdone(ie);
974 if (ferror(fp) || fclose(fp))
975 die(EXIT_FAILURE, "error reading input signature: %s", strerror(errno));
976 if (ofp && (fflush(ofp) || ferror(ofp) || fclose(ofp)))
977 die(EXIT_FAILURE, "error writing output signature: %s", strerror(errno));
978 if (mfp && (fflush(mfp) || ferror(mfp) || fclose(mfp)))
979 die(EXIT_FAILURE, "error writing output message: %s", strerror(errno));
980 freeenc(ie);
981 if (of) freeenc(oe);
982 sig_destroy(&s);
983 return (0);
984 }
985
986 static void infochoke(const char *m, void *p)
987 {
988 vrfctx *v = p;
989 printf("BAD %s: %s\n", v->what, m);
990 exit(EXIT_FAILURE);
991 }
992
993 static void infokeyreport(const char *file, int line,
994 const char *err, void *p)
995 { /*whatever*/; }
996
997 static int info(int argc, char *argv[])
998 {
999 const char *ef = "binary";
1000 vrfctx v = { 0, 0, 1 };
1001 key_file kf;
1002 key *k;
1003 sigmsg s;
1004 FILE *fp;
1005 int i;
1006 struct tm *tm;
1007 char bb[256];
1008 dstr d = DSTR_INIT;
1009 const encops *eo;
1010 enc *e;
1011
1012 for (;;) {
1013 static const struct option opt[] = {
1014 { "armour", 0, 0, 'a' },
1015 { "armor", 0, 0, 'a' },
1016 { "format", OPTF_ARGREQ, 0, 'f' },
1017 { "gmt", 0, 0, 'u' },
1018 { "utc", 0, 0, 'u' },
1019 { 0, 0, 0, 0 }
1020 };
1021 i = mdwopt(argc, argv, "f:au", opt, 0, 0, 0);
1022 if (i < 0) break;
1023 switch (i) {
1024 case 'a': ef = "pem"; break;
1025 case 'f': ef = optarg; break;
1026 case 'u': v.f |= F_UTC; break;
1027 default: v.f |= F_BOGUS; break;
1028 }
1029 }
1030 if (argc - optind > 1 || (v.f & F_BOGUS))
1031 die(EXIT_FAILURE, "Usage: info [-OPTIONS] [FILE]");
1032
1033 if ((eo = getenc(ef)) == 0)
1034 die(EXIT_FAILURE, "encoding `%s' not found", ef);
1035
1036 if (optind >= argc)
1037 fp = stdin;
1038 else if (strcmp(argv[optind], "-") == 0) {
1039 fp = stdin;
1040 optind++;
1041 } else if ((fp = fopen(argv[optind], eo->rmode)) == 0) {
1042 die(EXIT_FAILURE, "couldn't open file `%s': %s",
1043 argv[optind], strerror(errno));
1044 } else
1045 optind++;
1046
1047 if (key_open(&kf, keyring, KOPEN_READ, infokeyreport, 0)) {
1048 printf("NOTE can't open keyring `%s'\n", keyring);
1049 keyring = 0;
1050 }
1051 e = initdec(eo, fp, vrfbdry, &v);
1052
1053 v.what = "malformed header";
1054 sig_readheader(e, &s, infochoke, &v);
1055
1056 printf("INFO flags %sdetach %sbinary\n",
1057 (s.f & F_DETACH) ? "" : "!",
1058 (s.f & F_BINARY) ? "" : "!");
1059
1060 if (((s.f ^ v.f) & v.m) != 0) {
1061 printf("WARN boundary string inconsistent with contents\n");
1062 printf("INFO expected-flags");
1063 if (v.m & F_DETACH) printf(" %sdetach", (v.f & F_DETACH) ? "" : "!");
1064 if (v.m & F_BINARY) printf(" %sbinary", (v.f & F_BINARY) ? "" : "!");
1065 putchar('\n');
1066 }
1067 v.f |= s.f;
1068
1069 tm = (v.f & F_UTC) ? gmtime(&s.t) : localtime(&s.t);
1070 strftime(bb, sizeof(bb), "%Y-%m-%d %H:%M:%S %Z", tm);
1071 printf("INFO date %s\n", bb);
1072
1073 if (keyring && (k = key_byid(&kf, s.keyid)) != 0) {
1074 dstr_reset(&d); key_fulltag(k, &d);
1075 printf("INFO key %s\n", d.buf);
1076 } else
1077 printf("INFO unknown-key %08lx\n", (unsigned long)s.keyid);
1078
1079 if (keyring) key_close(&kf);
1080 dstr_destroy(&d);
1081 sig_destroy(&s);
1082 return (0);
1083 }
1084
1085 /*----- Main code ---------------------------------------------------------*/
1086
1087 #define LISTS(LI) \
1088 LI("Lists", list, \
1089 listtab[i].name, listtab[i].name) \
1090 LI("Signature schemes", sig, \
1091 sigtab[i].name, sigtab[i].name) \
1092 LI("Encodings", enc, \
1093 enctab[i].name, enctab[i].name) \
1094 LI("Hash functions", hash, \
1095 ghashtab[i], ghashtab[i]->name)
1096
1097 MAKELISTTAB(listtab, LISTS)
1098
1099 int cmd_show(int argc, char *argv[])
1100 {
1101 return (displaylists(listtab, argv + 1));
1102 }
1103
1104 static int cmd_help(int, char **);
1105
1106 static cmd cmdtab[] = {
1107 { "help", cmd_help, "help [COMMAND...]" },
1108 { "show", cmd_show, "show [ITEM...]" },
1109 CMD_ENCODE,
1110 CMD_DECODE,
1111 { "sign", sign,
1112 "sign [-adptC] [-k TAG] [-f FORMAT] [-o OUTPUT] [FILE]", "\
1113 Options:\n\
1114 \n\
1115 -a, --armour Same as `-f pem'.\n\
1116 -b, --binary Treat the input message as binary data.\n\
1117 -d, --detach Produce a detached signature.\n\
1118 -f, --format=FORMAT Encode as FORMAT.\n\
1119 -k, --key=TAG Use public encryption key named by TAG.\n\
1120 -o, --output=FILE Write output to FILE.\n\
1121 -p, --progress Show progress on large files.\n\
1122 -t, --text Canonify input message as a text file.\n\
1123 -C, --nocheck Don't check the private key.\n\
1124 " },
1125 { "verify", verify,
1126 "verify [-abpquvC] [-f FORMAT] [-k TAG] [-o OUTPUT]\n\t\
1127 [FILE [MESSAGE]]", "\
1128 Options:\n\
1129 \n\
1130 -a, --armour Same as `-f pem'.\n\
1131 -b, --buffer Buffer message until signature is verified.\n\
1132 -f, --format=FORMAT Decode as FORMAT.\n\
1133 -k, --key=TAG Require that the message be signed by key TAG.\n\
1134 -o, --output=FILE Write message to FILE.\n\
1135 -p, --progress Show progress on large files.\n\
1136 -q, --quiet Produce fewer messages.\n\
1137 -t, --freshtime=TIME Only accept signatures made after this time.\n\
1138 -u, --utc Show dates in UTC rather than local time.\n\
1139 -v, --verbose Produce more verbose messages.\n\
1140 -C, --nocheck Don't check the public key.\n\
1141 " },
1142 { "info", info,
1143 "info [-au] [-f FORMAT] [FILE]", "\
1144 Options:\n\
1145 \n\
1146 -a, --armour Same as `-f pem'.\n\
1147 -f, --format=FORMAT Decode as FORMAT.\n\
1148 -u, --utc Show dates in UTC rather than local time.\n\
1149 "},
1150 { "format", format,
1151 "format [-apuADE] [-f FORMAT] [-F format] [-m FILE] [-o FILE]\n\t\
1152 [FILE [MESSAGE]]", "\
1153 Options:\n\
1154 \n\
1155 -a, --armour-in Same as `-f pem'.\n\
1156 -A, --armour-out Same as `-F pem'.\n\
1157 -D, --detach Create detached signature.\n\
1158 -E, --embed Create signature with embedded message.\n\
1159 -f, --format-in=FORMAT Decode input as FORMAT.\n\
1160 -F, --format-out=FORMAT Encode output as FORMAT.\n\
1161 -m, --message=FILE Write message to FILE.\n\
1162 -o, --output=FILE Write new signature to FILE.\n\
1163 -p, --progress Show progress on large files.\n\
1164 "},
1165 { 0, 0, 0 }
1166 }; /* " Emacs seems confused. */
1167
1168 static int cmd_help(int argc, char **argv)
1169 {
1170 sc_help(cmdtab, stdout, argv + 1);
1171 return (0);
1172 }
1173
1174 void version(FILE *fp)
1175 {
1176 pquis(fp, "$, Catacomb version " VERSION "\n");
1177 }
1178
1179 static void usage(FILE *fp)
1180 {
1181 pquis(fp, "Usage: $ [-k KEYRING] COMMAND [ARGS]\n");
1182 }
1183
1184 void help_global(FILE *fp)
1185 {
1186 usage(fp);
1187 fputs("\n\
1188 Sign and verify data.\n\
1189 \n\
1190 Global command-line options:\n\
1191 \n\
1192 -h, --help [COMMAND...] Show this help message, or help for COMMANDs.\n\
1193 -v, --version Show program version number.\n\
1194 -u, --usage Show a terse usage message.\n\
1195 \n\
1196 -k, --keyring=FILE Read keys from FILE.\n",
1197 fp);
1198 }
1199
1200 /* --- @main@ --- *
1201 *
1202 * Arguments: @int argc@ = number of command line arguments
1203 * @char *argv[]@ = vector of command line arguments
1204 *
1205 * Returns: Zero if successful, nonzero otherwise.
1206 *
1207 * Use: Encrypts or decrypts files.
1208 */
1209
1210 int main(int argc, char *argv[])
1211 {
1212 unsigned f = 0;
1213
1214 #define f_bogus 1u
1215
1216 /* --- Initialize the library --- */
1217
1218 ego(argv[0]);
1219 sub_init();
1220 rand_noisesrc(RAND_GLOBAL, &noise_source);
1221 rand_seed(RAND_GLOBAL, 160);
1222
1223 /* --- Parse options --- */
1224
1225 for (;;) {
1226 static struct option opts[] = {
1227 { "help", 0, 0, 'h' },
1228 { "version", 0, 0, 'v' },
1229 { "usage", 0, 0, 'u' },
1230 { "keyring", OPTF_ARGREQ, 0, 'k' },
1231 { 0, 0, 0, 0 }
1232 };
1233 int i = mdwopt(argc, argv, "+hvu k:", opts, 0, 0, 0);
1234 if (i < 0)
1235 break;
1236 switch (i) {
1237 case 'h':
1238 sc_help(cmdtab, stdout, argv + optind);
1239 exit(0);
1240 break;
1241 case 'v':
1242 version(stdout);
1243 exit(0);
1244 break;
1245 case 'u':
1246 usage(stdout);
1247 exit(0);
1248 case 'k':
1249 keyring = optarg;
1250 break;
1251 default:
1252 f |= f_bogus;
1253 break;
1254 }
1255 }
1256
1257 argc -= optind;
1258 argv += optind;
1259 optind = 0;
1260 if (f & f_bogus || argc < 1) {
1261 usage(stderr);
1262 exit(EXIT_FAILURE);
1263 }
1264
1265 /* --- Dispatch to the correct subcommand handler --- */
1266
1267 return (findcmd(cmdtab, argv[0])->cmd(argc, argv));
1268
1269 #undef f_bogus
1270 }
1271
1272 /*----- That's all, folks -------------------------------------------------*/
Catacomb cryptographic library (downstream of http://git.distorted.org.uk/~mdw/catacomb/)