2ea939947d726a3add0762fe35e23028f36af76c
[project/ucert.git] / ucert.c
1 /*
2 * Copyright (C) 2018 Daniel Golle <daniel@makrotopia.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 3
6 * as published by the Free Software Foundation
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #define _GNU_SOURCE
15
16 #include <fcntl.h>
17 #include <dlfcn.h>
18 #include <stdio.h>
19 #include <stdbool.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <getopt.h>
23 #include <stdint.h>
24 #include <unistd.h>
25 #include <inttypes.h>
26 #include <sys/stat.h>
27 #include <sys/wait.h>
28
29 #include <json-c/json.h>
30 #include <libubox/blob.h>
31 #include <libubox/utils.h>
32 #include <libubox/list.h>
33 #include <libubox/vlist.h>
34 #include <libubox/blobmsg_json.h>
35
36 #include "usign.h"
37
38 #define CERT_BUF_LEN 4096
39
40 static enum {
41 CMD_APPEND,
42 CMD_DUMP,
43 CMD_ISSUE,
44 CMD_REVOKE,
45 CMD_VERIFY,
46 CMD_NONE,
47 } cmd = CMD_NONE;
48
49 static bool quiet;
50 #ifndef UCERT_STRIP_MESSAGES
51 #define DPRINTF(format, ...) \
52 do { \
53 if (!quiet) \
54 fprintf(stderr, "%s(%d): " format, __func__, __LINE__, ## __VA_ARGS__); \
55 } while (0)
56 #else
57 #define DPRINTF(format, ...) do { } while (0)
58 #endif
59
60 /*
61 * ucert structure
62 * | BLOB |
63 * | SIGNATURE | PAYLOAD |
64 * | |[ BLOBMSG CONTAINER ]|
65 * | |[[T,i,v,e,f,pubkey ]]|
66 */
67 enum cert_attr {
68 CERT_ATTR_SIGNATURE,
69 CERT_ATTR_PAYLOAD,
70 CERT_ATTR_MAX
71 };
72
73 static const struct blob_attr_info cert_policy[CERT_ATTR_MAX] = {
74 [CERT_ATTR_SIGNATURE] = { .type = BLOB_ATTR_BINARY },
75 [CERT_ATTR_PAYLOAD] = { .type = BLOB_ATTR_NESTED },
76 };
77
78 enum cert_cont_attr {
79 CERT_CT_ATTR_PAYLOAD,
80 CERT_CT_ATTR_MAX
81 };
82
83 static const struct blobmsg_policy cert_cont_policy[CERT_CT_ATTR_MAX] = {
84 [CERT_CT_ATTR_PAYLOAD] = { .name = "ucert", .type = BLOBMSG_TYPE_TABLE },
85 };
86
87 enum cert_payload_attr {
88 CERT_PL_ATTR_CERTTYPE,
89 CERT_PL_ATTR_CERTID,
90 CERT_PL_ATTR_VALIDFROMTIME,
91 CERT_PL_ATTR_EXPIRETIME,
92 CERT_PL_ATTR_PUBKEY,
93 CERT_PL_ATTR_KEY_FINGERPRINT,
94 CERT_PL_ATTR_MAX
95 };
96
97 enum certtype_id {
98 CERTTYPE_UNSPEC,
99 CERTTYPE_AUTH,
100 CERTTYPE_REVOKE
101 };
102
103 static const struct blobmsg_policy cert_payload_policy[CERT_PL_ATTR_MAX] = {
104 [CERT_PL_ATTR_CERTTYPE] = { .name = "certtype", .type = BLOBMSG_TYPE_INT32 },
105 [CERT_PL_ATTR_CERTID] = { .name = "certid", .type = BLOBMSG_TYPE_INT32 },
106 [CERT_PL_ATTR_VALIDFROMTIME] = { .name = "validfrom", .type = BLOBMSG_TYPE_INT64 },
107 [CERT_PL_ATTR_EXPIRETIME] = { .name = "expiresat", .type = BLOBMSG_TYPE_INT64 },
108 [CERT_PL_ATTR_PUBKEY] = { .name = "pubkey", .type = BLOBMSG_TYPE_STRING },
109 [CERT_PL_ATTR_KEY_FINGERPRINT] = { .name = "fingerprint", .type = BLOBMSG_TYPE_STRING },
110 };
111
112 /* list to store certificate chain at runtime */
113 struct cert_object {
114 struct list_head list;
115 struct blob_attr *cert[CERT_ATTR_MAX];
116 };
117
118 /* write buffer to file */
119 static int write_file(const char *filename, void *buf, size_t len, bool append) {
120 FILE *f;
121 size_t outlen;
122
123 f = fopen(filename, append?"a":"w");
124 if (!f)
125 return 1;
126
127 outlen = fwrite(buf, 1, len, f);
128 fclose(f);
129 return (outlen == len);
130 }
131
132 /* load certfile into list */
133 static int cert_load(const char *certfile, struct list_head *chain) {
134 FILE *f;
135 struct blob_attr *certtb[CERT_ATTR_MAX];
136 struct blob_attr *bufpt;
137 struct cert_object *cobj;
138 char filebuf[CERT_BUF_LEN];
139 int ret = 0, pret = 0;
140 size_t len, pos = 0;
141
142 f = fopen(certfile, "r");
143 if (!f)
144 return 1;
145
146 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f);
147 if (len < 64)
148 return 1;
149
150 ret = ferror(f) || !feof(f);
151 fclose(f);
152 if (ret)
153 return 1;
154
155 bufpt = (struct blob_attr *)filebuf;
156 do {
157 pret = blob_parse_untrusted(bufpt, len, certtb, cert_policy, CERT_ATTR_MAX);
158 if (pret <= 0)
159 /* no attributes found */
160 break;
161
162 if (pos + blob_pad_len(bufpt) > len)
163 /* blob exceeds filebuffer */
164 break;
165 else
166 pos += blob_pad_len(bufpt);
167
168 if (!certtb[CERT_ATTR_SIGNATURE])
169 /* no signature -> drop */
170 break;
171
172 cobj = calloc(1, sizeof(*cobj));
173 cobj->cert[CERT_ATTR_SIGNATURE] = blob_memdup(certtb[CERT_ATTR_SIGNATURE]);
174 if (certtb[CERT_ATTR_PAYLOAD])
175 cobj->cert[CERT_ATTR_PAYLOAD] = blob_memdup(certtb[CERT_ATTR_PAYLOAD]);
176
177 list_add_tail(&cobj->list, chain);
178 ret += pret;
179 /* repeat parsing while there is still enough remaining data in buffer */
180 } while(len > pos + sizeof(struct blob_attr) && (bufpt = blob_next(bufpt)));
181
182 return (ret <= 0);
183 }
184
185 #ifdef UCERT_FULL
186 /* append signature to certfile */
187 static int cert_append(const char *certfile, const char *sigfile) {
188 FILE *fs;
189 char filebuf[CERT_BUF_LEN];
190 struct blob_buf sigbuf = {0};
191 int len;
192 int ret;
193
194 fs = fopen(sigfile, "r");
195 if (!fs)
196 return 1;
197
198 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, fs);
199 ret = ferror(fs) || !feof(fs) || (len < 64);
200 fclose(fs);
201 if (ret)
202 return 1;
203
204 blob_buf_init(&sigbuf, 0);
205 blob_put(&sigbuf, CERT_ATTR_SIGNATURE, filebuf, len);
206 ret = write_file(certfile, sigbuf.head, blob_raw_len(sigbuf.head), true);
207 blob_buf_free(&sigbuf);
208 return ret;
209 }
210 #endif
211
212 /* verify the signature of a single chain element */
213 static int cert_verify_blob(struct blob_attr *cert[CERT_ATTR_MAX],
214 const char *pubkeyfile, const char *pubkeydir) {
215 int i;
216 char msgfname[256], sigfname[256];
217 int ret;
218 char tmpdir[] = "/tmp/ucert-XXXXXX";
219
220 if (mkdtemp(tmpdir) == NULL)
221 return errno;
222
223 snprintf(msgfname, sizeof(msgfname) - 1, "%s/%s", tmpdir, "payload");
224 snprintf(sigfname, sizeof(sigfname) - 1, "%s/%s", tmpdir, "payload.sig");
225
226 for (i = 0; i < CERT_ATTR_MAX; i++) {
227 struct blob_attr *v = cert[i];
228
229 if (!v)
230 break;
231
232 switch(cert_policy[i].type) {
233 case BLOB_ATTR_BINARY:
234 write_file(sigfname, blob_data(v), blob_len(v), false);
235 break;
236 case BLOB_ATTR_NESTED:
237 write_file(msgfname, blob_data(v), blob_len(v), false);
238 break;
239 }
240 }
241
242 ret = usign_v(msgfname, pubkeyfile, pubkeydir, sigfname, quiet);
243
244 unlink(msgfname);
245 unlink(sigfname);
246 rmdir(tmpdir);
247
248 return ret;
249 }
250
251 /* verify cert chain (and message) */
252 static int chain_verify(const char *msgfile, const char *pubkeyfile,
253 const char *pubkeydir, struct list_head *chain) {
254 struct cert_object *cobj;
255 struct blob_attr *containertb[CERT_CT_ATTR_MAX];
256 struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
257 char tmpdir[] = "/tmp/ucert-XXXXXX";
258 char chainedpubkey[256] = {0};
259 char chainedfp[17] = {0};
260 char extsigfile[256] = {0};
261 int ret = 1;
262 int checkmsg = 0;
263 struct timeval tv;
264
265 if (mkdtemp(tmpdir) == NULL)
266 return errno;
267
268 if (msgfile)
269 checkmsg = -1;
270
271 gettimeofday(&tv, NULL);
272
273 list_for_each_entry(cobj, chain, list) {
274 /* blob has payload, verify that using signature */
275 if (cobj->cert[CERT_ATTR_PAYLOAD]) {
276 time_t validfrom;
277 time_t expiresat;
278 uint32_t certtype;
279
280 ret = cert_verify_blob(cobj->cert, chainedpubkey[0]?chainedpubkey:pubkeyfile, pubkeydir);
281 if (ret)
282 goto clean_and_return;
283
284 blobmsg_parse(cert_cont_policy,
285 ARRAY_SIZE(cert_cont_policy),
286 containertb,
287 blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
288 blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
289 if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
290 ret = 1;
291 DPRINTF("no ucert in signed payload\n");
292 goto clean_and_return;
293 }
294 blobmsg_parse(cert_payload_policy,
295 ARRAY_SIZE(cert_payload_policy),
296 payloadtb,
297 blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
298 blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
299
300 if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
301 !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
302 !payloadtb[CERT_PL_ATTR_EXPIRETIME] ||
303 !payloadtb[CERT_PL_ATTR_PUBKEY]) {
304 ret = 1;
305 DPRINTF("missing mandatory ucert attributes\n");
306 goto clean_and_return;
307 }
308 certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
309 validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
310 expiresat = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_EXPIRETIME]);
311
312 if (certtype != CERTTYPE_AUTH) {
313 ret = 2;
314 DPRINTF("wrong certificate type\n");
315 goto clean_and_return;
316 }
317
318 if (tv.tv_sec < validfrom ||
319 tv.tv_sec >= expiresat) {
320 ret = 3;
321 DPRINTF("certificate expired\n");
322 goto clean_and_return;
323 }
324
325 snprintf(chainedpubkey, sizeof(chainedpubkey) - 1, "%s/%s", tmpdir, "chained-pubkey");
326 write_file(chainedpubkey,
327 blobmsg_data(payloadtb[CERT_PL_ATTR_PUBKEY]),
328 blobmsg_data_len(payloadtb[CERT_PL_ATTR_PUBKEY]),
329 false);
330
331 if (usign_f_pubkey(chainedfp, chainedpubkey)) {
332 DPRINTF("cannot get fingerprint for chained key\n");
333 ret = 2;
334 goto clean_and_return;
335 }
336 if (pubkeydir && _usign_key_is_revoked(chainedfp, pubkeydir)) {
337 DPRINTF("key %s has been revoked!\n", chainedfp);
338 ret = 4;
339 goto clean_and_return;
340 }
341 } else {
342 /* blob doesn't have payload, verify message using signature */
343 if (msgfile) {
344 snprintf(extsigfile, sizeof(extsigfile) - 1, "%s/%s", tmpdir, "ext-sig");
345 write_file(extsigfile,
346 blob_data(cobj->cert[CERT_ATTR_SIGNATURE]),
347 blob_len(cobj->cert[CERT_ATTR_SIGNATURE]),
348 false);
349 checkmsg = ret = usign_v(msgfile,
350 chainedpubkey[0]?chainedpubkey:pubkeyfile,
351 pubkeydir, extsigfile, quiet);
352 unlink(extsigfile);
353 } else {
354 DPRINTF("stray trailing signature without anything to verify!\n");
355 ret = 1;
356 };
357 }
358 }
359
360 if (checkmsg == -1)
361 DPRINTF("missing signature to verify message!\n");
362
363 clean_and_return:
364 if (chainedpubkey[0])
365 unlink(chainedpubkey);
366 rmdir(tmpdir);
367 return ret | checkmsg;
368 }
369
370 #ifdef UCERT_FULL
371 /* dump single chain element to console */
372 static void cert_dump_blob(struct blob_attr *cert[CERT_ATTR_MAX]) {
373 int i;
374 char *json = NULL;
375
376 for (i = 0; i < CERT_ATTR_MAX; i++) {
377 struct blob_attr *v = cert[i];
378
379 if (!v)
380 continue;
381
382 switch(cert_policy[i].type) {
383 case BLOB_ATTR_BINARY:
384 printf("signature:\n---\n%s---\n", (char *) blob_data(v));
385 break;
386 case BLOB_ATTR_NESTED:
387 json = blobmsg_format_json_indent(blob_data(v), false, 0);
388 if (!json) {
389 DPRINTF("cannot parse payload\n");
390 continue;
391 }
392 printf("payload:\n---\n%s\n---\n", json);
393 free(json);
394 break;
395 }
396 }
397 }
398
399 /* dump certfile to console */
400 static int cert_dump(const char *certfile) {
401 struct cert_object *cobj;
402 static LIST_HEAD(certchain);
403 unsigned int count = 0;
404
405 if (cert_load(certfile, &certchain)) {
406 DPRINTF("cannot parse cert\n");
407 return 1;
408 }
409
410 list_for_each_entry(cobj, &certchain, list) {
411 printf("=== CHAIN ELEMENT %02u ===\n", ++count);
412 cert_dump_blob(cobj->cert);
413 }
414
415 return 0;
416 }
417
418 /* issue an auth certificate for pubkey */
419 static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) {
420 struct blob_buf payloadbuf = {0};
421 struct blob_buf certbuf = {0};
422 struct timeval tv;
423 int pklen, siglen;
424 int revoker = 1;
425 void *c;
426 FILE *pkf, *sigf;
427 char pkb[512];
428 char sigb[1024];
429 char fname[256], sfname[256];
430 char pkfp[17];
431 char tmpdir[] = "/tmp/ucert-XXXXXX";
432
433 pkf = fopen(pubkeyfile, "r");
434 if (!pkf)
435 return -1;
436
437 pklen = fread(pkb, 1, 512, pkf);
438 pkb[pklen] = '\0';
439
440 if (pklen < 32)
441 return -1;
442
443 fclose(pkf);
444
445 if (usign_f_pubkey(pkfp, pubkeyfile))
446 return -1;
447
448 gettimeofday(&tv, NULL);
449
450 if (mkdtemp(tmpdir) == NULL)
451 return errno;
452
453 while (revoker >= 0) {
454 blob_buf_init(&payloadbuf, 0);
455 c = blobmsg_open_table(&payloadbuf, "ucert");
456 blobmsg_add_u32(&payloadbuf, "certtype", revoker?CERTTYPE_REVOKE:CERTTYPE_AUTH);
457 blobmsg_add_u64(&payloadbuf, "validfrom", tv.tv_sec);
458 if (!revoker) {
459 blobmsg_add_u64(&payloadbuf, "expiresat", tv.tv_sec + 60 * 60 * 24 * 365);
460 blobmsg_add_string(&payloadbuf, "pubkey", pkb);
461 } else {
462 blobmsg_add_string(&payloadbuf, "fingerprint", pkfp);
463 }
464
465 blobmsg_close_table(&payloadbuf, c);
466
467 snprintf(fname, sizeof(fname) - 1, "%s/%s", tmpdir, revoker?"revoker":"payload");
468 write_file(fname, blob_data(payloadbuf.head), blob_len(payloadbuf.head), false);
469
470 snprintf(sfname, sizeof(sfname) - 1, "%s/%s", tmpdir, revoker?"revoker.sig":"payload.sig");
471 if (usign_s(fname, seckeyfile, sfname, quiet))
472 return 1;
473
474 sigf = fopen(sfname, "r");
475 if (!sigf)
476 return 1;
477
478 siglen = fread(sigb, 1, 1024, sigf);
479 if (siglen < 1)
480 return 1;
481
482 sigb[siglen] = '\0';
483 fclose(sigf);
484
485 unlink(fname);
486 unlink(sfname);
487
488 blob_buf_init(&certbuf, 0);
489 blob_put(&certbuf, CERT_ATTR_SIGNATURE, sigb, siglen);
490 blob_put(&certbuf, CERT_ATTR_PAYLOAD, blob_data(payloadbuf.head), blob_len(payloadbuf.head));
491 snprintf(fname, sizeof(fname) - 1, "%s%s", certfile, revoker?".revoke":"");
492 write_file(fname, certbuf.head, blob_raw_len(certbuf.head), true);
493 blob_buf_free(&certbuf);
494 blob_buf_free(&payloadbuf);
495
496 revoker--;
497 }
498
499 rmdir(tmpdir);
500
501 return 0;
502 }
503 #endif
504
505 /* process revoker certificate */
506 static int cert_process_revoker(const char *certfile, const char *pubkeydir) {
507 static LIST_HEAD(certchain);
508 struct cert_object *cobj;
509 struct blob_attr *containertb[CERT_CT_ATTR_MAX];
510 struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
511 struct stat st;
512 struct timeval tv;
513 time_t validfrom;
514 enum certtype_id certtype;
515 char *fingerprint;
516 char rfname[512];
517
518 int ret = -1;
519
520 if (cert_load(certfile, &certchain)) {
521 DPRINTF("cannot parse cert\n");
522 return 1;
523 }
524
525 gettimeofday(&tv, NULL);
526
527 list_for_each_entry(cobj, &certchain, list) {
528 if (!cobj->cert[CERT_ATTR_PAYLOAD])
529 return 2;
530
531 /* blob has payload, verify that using signature */
532 ret = cert_verify_blob(cobj->cert, NULL, pubkeydir);
533 if (ret)
534 return ret;
535
536 blobmsg_parse(cert_cont_policy,
537 ARRAY_SIZE(cert_cont_policy),
538 containertb,
539 blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
540 blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
541 if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
542 DPRINTF("no ucert in signed payload\n");
543 return 2;
544 }
545
546 blobmsg_parse(cert_payload_policy,
547 ARRAY_SIZE(cert_payload_policy),
548 payloadtb,
549 blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
550 blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
551
552 if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
553 !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
554 !payloadtb[CERT_PL_ATTR_KEY_FINGERPRINT]) {
555 DPRINTF("missing mandatory ucert attributes\n");
556 return 2;
557 }
558
559 certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
560 validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
561 fingerprint = blobmsg_get_string(payloadtb[CERT_PL_ATTR_KEY_FINGERPRINT]);
562
563 if (certtype != CERTTYPE_REVOKE) {
564 DPRINTF("wrong certificate type\n");
565 return 2;
566 }
567
568 if (tv.tv_sec < validfrom) {
569 return 3;
570 }
571
572 snprintf(rfname, sizeof(rfname)-1, "%s/%s", pubkeydir, fingerprint);
573 /* check if entry in pubkeydir exists */
574 if (stat(rfname, &st) == 0) {
575 if (_usign_key_is_revoked(fingerprint, pubkeydir)) {
576 DPRINTF("existing revoker deadlink for key %s\n", fingerprint);
577 continue;
578 };
579
580 /* remove any other entry */
581 if (unlink(rfname))
582 return -1;
583 }
584
585 ret = symlink(".revoked.", rfname);
586 if (ret)
587 return ret;
588
589 DPRINTF("created revoker deadlink for key %s\n", fingerprint);
590 };
591
592 return ret;
593 }
594
595 /* load and verify certfile (and message) */
596 static int cert_verify(const char *certfile, const char *pubkeyfile, const char *pubkeydir, const char *msgfile) {
597 static LIST_HEAD(certchain);
598
599 if (cert_load(certfile, &certchain)) {
600 DPRINTF("cannot parse cert\n");
601 return 1;
602 }
603
604 return chain_verify(msgfile, pubkeyfile, pubkeydir, &certchain);
605 }
606
607 /* output help */
608 static int usage(const char *cmd)
609 {
610 #ifndef UCERT_STRIP_MESSAGES
611 fprintf(stderr,
612 "Usage: %s <command> <options>\n"
613 "Commands:\n"
614 #ifdef UCERT_FULL
615 " -A: append signature (needs -c and -x)\n"
616 " -D: dump (needs -c)\n"
617 " -I: issue cert and revoker (needs -c and -p and -s)\n"
618 #endif /* UCERT_FULL */
619 " -R: process revoker certificate (needs -c and -P)\n"
620 " -V: verify (needs -c and -p|-P, may have -m)\n"
621 "Options:\n"
622 " -c <file>: certificate file\n"
623 " -m <file>: message file (verify only)\n"
624 " -p <file>: public key file\n"
625 " -P <path>: public key directory (verify only)\n"
626 " -q: quiet (do not print verification result, use return code only)\n"
627 #ifdef UCERT_FULL
628 " -s <file>: secret key file (issue only)\n"
629 " -x <file>: signature file (append only)\n"
630 #endif /* UCERT_FULL */
631 "\n",
632 cmd);
633 #endif /* UCERT_STRIP_MESSAGES */
634 return 1;
635 }
636
637 /* parse command line options and call functions */
638 int main(int argc, char *argv[]) {
639 int ch;
640 const char *msgfile = NULL;
641 const char *pubkeyfile = NULL;
642 const char *pubkeydir = NULL;
643 const char *certfile = NULL;
644 #ifdef UCERT_FULL
645 const char *sigfile = NULL;
646 const char *seckeyfile = NULL;
647 #endif
648
649 quiet = false;
650 while ((ch = getopt(argc, argv,
651 "RVc:m:p:P:q"
652 #ifdef UCERT_FULL
653 "ADIs:x:"
654 #endif
655 )) != -1) {
656 switch (ch) {
657 #ifdef UCERT_FULL
658 case 'A':
659 if (cmd != CMD_NONE)
660 return usage(argv[0]);
661 cmd = CMD_APPEND;
662 break;
663 case 'D':
664 if (cmd != CMD_NONE)
665 return usage(argv[0]);
666 cmd = CMD_DUMP;
667 break;
668 case 'I':
669 if (cmd != CMD_NONE)
670 return usage(argv[0]);
671 cmd = CMD_ISSUE;
672 break;
673 #endif
674 case 'R':
675 if (cmd != CMD_NONE)
676 return usage(argv[0]);
677 cmd = CMD_REVOKE;
678 break;
679 case 'V':
680 if (cmd != CMD_NONE)
681 return usage(argv[0]);
682 cmd = CMD_VERIFY;
683 break;
684 case 'c':
685 if (certfile || cmd == CMD_NONE)
686 return usage(argv[0]);
687 certfile = optarg;
688 break;
689 case 'm':
690 if (msgfile || cmd != CMD_VERIFY)
691 return usage(argv[0]);
692 msgfile = optarg;
693 break;
694 case 'p':
695 if (pubkeyfile || (cmd != CMD_VERIFY && cmd != CMD_ISSUE) || cmd == CMD_NONE)
696 return usage(argv[0]);
697 pubkeyfile = optarg;
698 break;
699 case 'P':
700 if (pubkeydir || (cmd != CMD_VERIFY && cmd != CMD_REVOKE) || cmd == CMD_NONE)
701 return usage(argv[0]);
702 pubkeydir = optarg;
703 break;
704 case 'q':
705 if (quiet)
706 return usage(argv[0]);
707 quiet = true;
708 break;
709 #ifdef UCERT_FULL
710 case 's':
711 if (seckeyfile || cmd != CMD_ISSUE || cmd == CMD_NONE)
712 return usage(argv[0]);
713 seckeyfile = optarg;
714 break;
715 case 'x':
716 if (sigfile || cmd != CMD_APPEND || cmd == CMD_NONE)
717 return usage(argv[0]);
718 sigfile = optarg;
719 break;
720 #endif
721 default:
722 return usage(argv[0]);
723 }
724 }
725
726 switch (cmd) {
727 #ifdef UCERT_FULL
728 case CMD_APPEND:
729 if (certfile && sigfile)
730 return cert_append(certfile, sigfile);
731 else
732 return usage(argv[0]);
733 case CMD_DUMP:
734 if (certfile)
735 return cert_dump(certfile);
736 else
737 return usage(argv[0]);
738 case CMD_ISSUE:
739 if (certfile && pubkeyfile && seckeyfile)
740 return cert_issue(certfile, pubkeyfile, seckeyfile);
741 else
742 return usage(argv[0]);
743 #endif
744 case CMD_REVOKE:
745 if (certfile && pubkeydir)
746 return cert_process_revoker(certfile, pubkeydir);
747 else
748 return usage(argv[0]);
749 case CMD_VERIFY:
750 if (certfile && (pubkeyfile || pubkeydir))
751 return cert_verify(certfile, pubkeyfile, pubkeydir, msgfile);
752 else
753 return usage(argv[0]);
754 default:
755 return usage(argv[0]);
756 }
757
758 /* unreachable */
759 return usage(argv[0]);
760 }