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[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
51 enum cert_attr {
52 CERT_ATTR_SIGNATURE,
53 CERT_ATTR_PAYLOAD,
54 CERT_ATTR_MAX
55 };
56
57 static const struct blob_attr_info cert_policy[CERT_ATTR_MAX] = {
58 [CERT_ATTR_SIGNATURE] = { .type = BLOB_ATTR_BINARY },
59 [CERT_ATTR_PAYLOAD] = { .type = BLOB_ATTR_NESTED },
60 };
61
62 enum cert_cont_attr {
63 CERT_CT_ATTR_PAYLOAD,
64 CERT_CT_ATTR_MAX
65 };
66
67 static const struct blobmsg_policy cert_cont_policy[CERT_CT_ATTR_MAX] = {
68 [CERT_CT_ATTR_PAYLOAD] = { .name = "ucert", .type = BLOBMSG_TYPE_TABLE },
69 };
70
71 enum cert_payload_attr {
72 CERT_PL_ATTR_CERTTYPE,
73 CERT_PL_ATTR_CERTID,
74 CERT_PL_ATTR_VALIDFROMTIME,
75 CERT_PL_ATTR_EXPIRETIME,
76 CERT_PL_ATTR_PUBKEY,
77 CERT_PL_ATTR_KEY_FINGERPRINT,
78 CERT_PL_ATTR_MAX
79 };
80
81 enum certtype_id {
82 CERTTYPE_UNSPEC,
83 CERTTYPE_AUTH,
84 CERTTYPE_REVOKE
85 };
86
87 static const struct blobmsg_policy cert_payload_policy[CERT_PL_ATTR_MAX] = {
88 [CERT_PL_ATTR_CERTTYPE] = { .name = "certtype", .type = BLOBMSG_TYPE_INT32 },
89 [CERT_PL_ATTR_CERTID] = { .name = "certid", .type = BLOBMSG_TYPE_INT32 },
90 [CERT_PL_ATTR_VALIDFROMTIME] = { .name = "validfrom", .type = BLOBMSG_TYPE_INT64 },
91 [CERT_PL_ATTR_EXPIRETIME] = { .name = "expiresat", .type = BLOBMSG_TYPE_INT64 },
92 [CERT_PL_ATTR_PUBKEY] = { .name = "pubkey", .type = BLOBMSG_TYPE_STRING },
93 [CERT_PL_ATTR_KEY_FINGERPRINT] = { .name = "fingerprint", .type = BLOBMSG_TYPE_STRING },
94 };
95
96 struct cert_object {
97 struct list_head list;
98 struct blob_attr *cert[CERT_ATTR_MAX];
99 };
100
101 static int write_file(const char *filename, void *buf, size_t len, bool append) {
102 FILE *f;
103 size_t outlen;
104
105 f = fopen(filename, append?"a":"w");
106 if (!f)
107 return 1;
108
109 outlen = fwrite(buf, 1, len, f);
110 fclose(f);
111 return (outlen == len);
112 }
113
114 static int cert_load(const char *certfile, struct list_head *chain) {
115 FILE *f;
116 struct blob_attr *certtb[CERT_ATTR_MAX];
117 struct blob_attr *bufpt;
118 struct cert_object *cobj;
119 char filebuf[CERT_BUF_LEN];
120 int ret = 0, pret = 0;
121 int len, pos = 0;
122
123 f = fopen(certfile, "r");
124 if (!f)
125 return 1;
126
127 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f);
128 if (len < 64)
129 return 1;
130
131 ret = ferror(f) || !feof(f);
132 fclose(f);
133 if (ret)
134 return 1;
135
136 bufpt = (struct blob_attr *)filebuf;
137 do {
138 pret = blob_parse(bufpt, certtb, cert_policy, CERT_ATTR_MAX);
139 if (pret <= 0)
140 /* no attributes found */
141 break;
142
143 if (pos + blob_pad_len(bufpt) > len)
144 /* blob exceeds filebuffer */
145 break;
146 else
147 pos += blob_pad_len(bufpt);
148
149 cobj = calloc(1, sizeof(*cobj));
150 memcpy(cobj->cert, &certtb, sizeof(certtb));
151 list_add_tail(&cobj->list, chain);
152 ret += pret;
153 bufpt = blob_next(bufpt);
154 /* repeat parsing while there is still enough remaining data in buffer */
155 } while(len > pos + sizeof(struct blob_attr));
156
157 return (ret <= 0);
158 }
159
160 static int cert_append(const char *certfile, const char *sigfile) {
161 FILE *fs;
162 char filebuf[CERT_BUF_LEN];
163 struct blob_buf sigbuf;
164 int len;
165 int ret;
166
167 fs = fopen(sigfile, "r");
168 if (!fs)
169 return 1;
170
171 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, fs);
172 ret = ferror(fs) || !feof(fs) || (len < 64);
173 fclose(fs);
174 if (ret)
175 return 1;
176
177 blob_buf_init(&sigbuf, 0);
178 blob_put(&sigbuf, CERT_ATTR_SIGNATURE, filebuf, len);
179 ret = write_file(certfile, sigbuf.head, blob_raw_len(sigbuf.head), true);
180 blob_buf_free(&sigbuf);
181 return ret;
182 }
183
184 static int cert_verify_blob(struct blob_attr *cert[CERT_ATTR_MAX],
185 const char *pubkeyfile, const char *pubkeydir) {
186 int i;
187 char msgfname[256], sigfname[256];
188 int ret;
189 char tmpdir[] = "/tmp/ucert-XXXXXX";
190
191 if (mkdtemp(tmpdir) == NULL)
192 return errno;
193
194 snprintf(msgfname, sizeof(msgfname) - 1, "%s/%s", tmpdir, "payload");
195 snprintf(sigfname, sizeof(sigfname) - 1, "%s/%s", tmpdir, "payload.sig");
196
197 for (i = 0; i < CERT_ATTR_MAX; i++) {
198 struct blob_attr *v = cert[i];
199
200 if (!v)
201 break;
202
203 switch(cert_policy[i].type) {
204 case BLOB_ATTR_BINARY:
205 write_file(sigfname, blob_data(v), blob_len(v), false);
206 break;
207 case BLOB_ATTR_NESTED:
208 write_file(msgfname, blob_data(v), blob_len(v), false);
209 break;
210 }
211 }
212
213 ret = usign_v(msgfname, pubkeyfile, pubkeydir, sigfname, quiet);
214
215 unlink(msgfname);
216 unlink(sigfname);
217 rmdir(tmpdir);
218
219 return ret;
220 }
221
222 static int chain_verify(const char *msgfile, const char *pubkeyfile,
223 const char *pubkeydir, struct list_head *chain) {
224 struct cert_object *cobj;
225 struct blob_attr *containertb[CERT_CT_ATTR_MAX];
226 struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
227 char tmpdir[] = "/tmp/ucert-XXXXXX";
228 char chainedpubkey[256] = {0};
229 char chainedfp[17] = {0};
230 char extsigfile[256] = {0};
231 int ret = 1;
232 int checkmsg = 0;
233
234 if (mkdtemp(tmpdir) == NULL)
235 return errno;
236
237 if (msgfile)
238 checkmsg = -1;
239
240 list_for_each_entry(cobj, chain, list) {
241 /* blob has payload, verify that using signature */
242 if (cobj->cert[CERT_ATTR_PAYLOAD]) {
243 struct timeval tv;
244 uint64_t validfrom;
245 uint64_t expiresat;
246 uint32_t certtype;
247
248 ret = cert_verify_blob(cobj->cert, chainedpubkey[0]?chainedpubkey:pubkeyfile, pubkeydir);
249 if (ret)
250 goto clean_and_return;
251
252 blobmsg_parse(cert_cont_policy,
253 ARRAY_SIZE(cert_cont_policy),
254 containertb,
255 blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
256 blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
257 if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
258 ret = 1;
259 fprintf(stderr, "no ucert in signed payload\n");
260 goto clean_and_return;
261 }
262 blobmsg_parse(cert_payload_policy,
263 ARRAY_SIZE(cert_payload_policy),
264 payloadtb,
265 blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
266 blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
267
268 if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
269 !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
270 !payloadtb[CERT_PL_ATTR_EXPIRETIME] ||
271 !payloadtb[CERT_PL_ATTR_PUBKEY]) {
272 ret = 1;
273 fprintf(stderr, "missing mandatory ucert attributes\n");
274 goto clean_and_return;
275 }
276 certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
277 validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
278 expiresat = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_EXPIRETIME]);
279
280 if (certtype != CERTTYPE_AUTH) {
281 ret = 2;
282 fprintf(stderr, "wrong certificate type\n");
283 goto clean_and_return;
284 }
285
286 gettimeofday(&tv, NULL);
287 if (tv.tv_sec < validfrom ||
288 tv.tv_sec >= expiresat) {
289 ret = 3;
290 fprintf(stderr, "certificate expired\n");
291 goto clean_and_return;
292 }
293
294 snprintf(chainedpubkey, sizeof(chainedpubkey) - 1, "%s/%s", tmpdir, "chained-pubkey");
295 write_file(chainedpubkey,
296 blobmsg_data(payloadtb[CERT_PL_ATTR_PUBKEY]),
297 blobmsg_data_len(payloadtb[CERT_PL_ATTR_PUBKEY]),
298 false);
299
300 if (usign_f_pubkey(chainedfp, chainedpubkey)) {
301 if (!quiet)
302 fprintf(stderr, "cannot get fingerprint for chained key\n");
303 ret = 2;
304 goto clean_and_return;
305 }
306 if (pubkeydir && _usign_key_is_revoked(chainedfp, pubkeydir)) {
307 if (!quiet)
308 fprintf(stderr, "key %s has been revoked!\n", chainedfp);
309 ret = 4;
310 goto clean_and_return;
311 }
312 } else {
313 /* blob doesn't have payload, verify message using signature */
314 if (msgfile) {
315 snprintf(extsigfile, sizeof(extsigfile) - 1, "%s/%s", tmpdir, "ext-sig");
316 write_file(extsigfile,
317 blob_data(cobj->cert[CERT_ATTR_SIGNATURE]),
318 blob_len(cobj->cert[CERT_ATTR_SIGNATURE]),
319 false);
320 checkmsg = ret = usign_v(msgfile,
321 chainedpubkey[0]?chainedpubkey:pubkeyfile,
322 pubkeydir, extsigfile, quiet);
323 unlink(extsigfile);
324 } else {
325 fprintf(stderr, "stray trailing signature without anything to verify!\n");
326 ret = 1;
327 };
328 }
329 }
330
331 if (checkmsg == -1)
332 fprintf(stderr, "missing signature to verify message!\n");
333
334 clean_and_return:
335 if (chainedpubkey[0])
336 unlink(chainedpubkey);
337 rmdir(tmpdir);
338 return ret | checkmsg;
339 }
340
341 static void cert_dump_blob(struct blob_attr *cert[CERT_ATTR_MAX]) {
342 int i;
343
344 for (i = 0; i < CERT_ATTR_MAX; i++) {
345 struct blob_attr *v = cert[i];
346
347 if (!v)
348 continue;
349
350 switch(cert_policy[i].type) {
351 case BLOB_ATTR_BINARY:
352 fprintf(stdout, "signature:\n---\n%s---\n", (char *) blob_data(v));
353 break;
354 case BLOB_ATTR_NESTED:
355 fprintf(stdout, "payload:\n---\n%s\n---\n", blobmsg_format_json_indent(blob_data(v), false, 0));
356 break;
357 }
358 }
359 }
360
361 static int cert_dump(const char *certfile) {
362 struct cert_object *cobj;
363 static LIST_HEAD(certchain);
364 unsigned int count = 0;
365
366 if (cert_load(certfile, &certchain)) {
367 fprintf(stderr, "cannot parse cert\n");
368 return 1;
369 }
370
371 list_for_each_entry(cobj, &certchain, list) {
372 fprintf(stderr, "=== CHAIN ELEMENT %02u ===\n", ++count);
373 cert_dump_blob(cobj->cert);
374 fprintf(stderr, "========================\n");
375 }
376
377 return 0;
378 }
379
380 static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) {
381 struct blob_buf certbuf;
382 struct blob_buf payloadbuf;
383 struct timeval tv;
384 struct stat st;
385 int pklen, siglen;
386 int revoker = 1;
387 void *c;
388 FILE *pkf, *sigf;
389 char pkb[512];
390 char sigb[512];
391 char fname[256], sfname[256];
392 char pkfp[17];
393 char tmpdir[] = "/tmp/ucert-XXXXXX";
394
395 if (stat(certfile, &st) == 0) {
396 fprintf(stderr, "certfile %s exists, won't overwrite.\n", certfile);
397 return -1;
398 }
399
400 pkf = fopen(pubkeyfile, "r");
401 if (!pkf)
402 return -1;
403
404 pklen = fread(pkb, 1, 512, pkf);
405 pkb[pklen] = '\0';
406
407 if (pklen < 32)
408 return -1;
409
410 fclose(pkf);
411
412 if (usign_f_pubkey(pkfp, pubkeyfile))
413 return -1;
414
415 gettimeofday(&tv, NULL);
416
417 if (mkdtemp(tmpdir) == NULL)
418 return errno;
419
420 while (revoker >= 0) {
421 blob_buf_init(&payloadbuf, 0);
422 c = blobmsg_open_table(&payloadbuf, "ucert");
423 blobmsg_add_u32(&payloadbuf, "certtype", revoker?CERTTYPE_REVOKE:CERTTYPE_AUTH);
424 blobmsg_add_u64(&payloadbuf, "validfrom", tv.tv_sec);
425 if (!revoker) {
426 blobmsg_add_u64(&payloadbuf, "expiresat", tv.tv_sec + 60 * 60 * 24 * 365);
427 blobmsg_add_string(&payloadbuf, "pubkey", pkb);
428 } else {
429 blobmsg_add_string(&payloadbuf, "fingerprint", pkfp);
430 }
431
432 blobmsg_close_table(&payloadbuf, c);
433
434 snprintf(fname, sizeof(fname) - 1, "%s/%s", tmpdir, revoker?"revoker":"payload");
435 write_file(fname, blob_data(payloadbuf.head), blob_len(payloadbuf.head), false);
436
437 snprintf(sfname, sizeof(sfname) - 1, "%s/%s", tmpdir, revoker?"revoker.sig":"payload.sig");
438 if (usign_s(fname, seckeyfile, sfname, quiet))
439 return 1;
440
441 sigf = fopen(sfname, "r");
442 if (!sigf)
443 return 1;
444
445 siglen = fread(sigb, 1, 1024, sigf);
446 if (siglen < 1)
447 return 1;
448
449 sigb[siglen] = '\0';
450 fclose(sigf);
451
452 unlink(fname);
453 unlink(sfname);
454
455 blob_buf_init(&certbuf, 0);
456 blob_put(&certbuf, CERT_ATTR_SIGNATURE, sigb, siglen);
457 blob_put(&certbuf, CERT_ATTR_PAYLOAD, blob_data(payloadbuf.head), blob_len(payloadbuf.head));
458 snprintf(fname, sizeof(fname) - 1, "%s%s", certfile, revoker?".revoke":"");
459 write_file(fname, certbuf.head, blob_raw_len(certbuf.head), false);
460 blob_buf_free(&certbuf);
461 blob_buf_free(&payloadbuf);
462
463 revoker--;
464 }
465
466 rmdir(tmpdir);
467
468 return 0;
469 }
470
471 static int cert_process_revoker(const char *certfile, const char *pubkeydir) {
472 static LIST_HEAD(certchain);
473 struct cert_object *cobj;
474 struct blob_attr *containertb[CERT_CT_ATTR_MAX];
475 struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
476 struct stat st;
477 struct timeval tv;
478 uint64_t validfrom;
479 uint32_t certtype;
480 char *fingerprint;
481 char rfname[512];
482
483 int ret;
484
485 if (cert_load(certfile, &certchain)) {
486 fprintf(stderr, "cannot parse cert\n");
487 return 1;
488 }
489
490 list_for_each_entry(cobj, &certchain, list) {
491 /* blob has payload, verify that using signature */
492 if (!cobj->cert[CERT_ATTR_PAYLOAD])
493 return 2;
494 ret = cert_verify_blob(cobj->cert, NULL, pubkeydir);
495 if (ret)
496 return ret;
497
498 blobmsg_parse(cert_cont_policy,
499 ARRAY_SIZE(cert_cont_policy),
500 containertb,
501 blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
502 blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
503 if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
504 fprintf(stderr, "no ucert in signed payload\n");
505 return 2;
506 }
507
508 blobmsg_parse(cert_payload_policy,
509 ARRAY_SIZE(cert_payload_policy),
510 payloadtb,
511 blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
512 blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
513
514 if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
515 !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
516 !payloadtb[CERT_PL_ATTR_KEY_FINGERPRINT]) {
517 fprintf(stderr, "missing mandatory ucert attributes\n");
518 return 2;
519 }
520
521 certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
522 validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
523 fingerprint = blobmsg_get_string(payloadtb[CERT_PL_ATTR_KEY_FINGERPRINT]);
524
525 if (certtype != CERTTYPE_REVOKE) {
526 fprintf(stderr, "wrong certificate type\n");
527 return 2;
528 }
529
530 gettimeofday(&tv, NULL);
531 if (tv.tv_sec < validfrom) {
532 return 3;
533 }
534
535 snprintf(rfname, sizeof(rfname)-1, "%s/%s", pubkeydir, fingerprint);
536 /* check if entry in pubkeydir exists */
537 if (stat(rfname, &st) == 0) {
538 if (_usign_key_is_revoked(fingerprint, pubkeydir)) {
539 if (!quiet)
540 fprintf(stdout, "existing revoker deadlink for key %s\n", fingerprint);
541 continue;
542 };
543
544 /* remove any other entry */
545 if (unlink(rfname))
546 return -1;
547 }
548
549 ret = symlink(".revoked.", rfname);
550 if (ret)
551 return ret;
552
553 if (!quiet)
554 fprintf(stdout, "created revoker deadlink for key %s\n", fingerprint);
555 };
556
557 return ret;
558 }
559
560 static int cert_verify(const char *certfile, const char *pubkeyfile, const char *pubkeydir, const char *msgfile) {
561 static LIST_HEAD(certchain);
562
563 if (cert_load(certfile, &certchain)) {
564 fprintf(stderr, "cannot parse cert\n");
565 return 1;
566 }
567
568 return chain_verify(msgfile, pubkeyfile, pubkeydir, &certchain);
569 }
570
571 static int usage(const char *cmd)
572 {
573 fprintf(stderr,
574 "Usage: %s <command> <options>\n"
575 "Commands:\n"
576 " -A: append signature (needs -c and -x)\n"
577 " -D: dump (needs -c)\n"
578 " -I: issue cert and revoker (needs -c and -p and -s)\n"
579 " -R: process revoker certificate (needs -c and -P)\n"
580 " -V: verify (needs -c and -p|-P, may have -m)\n"
581 "Options:\n"
582 " -c <file>: certificate file\n"
583 " -m <file>: message file (verify only)\n"
584 " -p <file>: public key file\n"
585 " -P <path>: public key directory (verify only)\n"
586 " -q: quiet (do not print verification result, use return code only)\n"
587 " -s <file>: secret key file (issue only)\n"
588 " -x <file>: signature file\n"
589 "\n",
590 cmd);
591 return 1;
592 }
593
594 int main(int argc, char *argv[]) {
595 int ch;
596 const char *msgfile = NULL;
597 const char *sigfile = NULL;
598 const char *pubkeyfile = NULL;
599 const char *pubkeydir = NULL;
600 const char *certfile = NULL;
601 const char *seckeyfile = NULL;
602
603 quiet = false;
604 while ((ch = getopt(argc, argv, "ADIRVc:m:p:P:qs:x:")) != -1) {
605 switch (ch) {
606 case 'A':
607 cmd = CMD_APPEND;
608 break;
609 case 'D':
610 cmd = CMD_DUMP;
611 break;
612 case 'I':
613 cmd = CMD_ISSUE;
614 break;
615 case 'R':
616 cmd = CMD_REVOKE;
617 break;
618 case 'V':
619 cmd = CMD_VERIFY;
620 break;
621 case 'c':
622 certfile = optarg;
623 break;
624 case 'm':
625 msgfile = optarg;
626 break;
627 case 'p':
628 pubkeyfile = optarg;
629 break;
630 case 'P':
631 pubkeydir = optarg;
632 break;
633 case 'q':
634 quiet = true;
635 break;
636 case 's':
637 seckeyfile = optarg;
638 break;
639 case 'x':
640 sigfile = optarg;
641 break;
642 default:
643 return usage(argv[0]);
644 }
645 }
646
647 switch (cmd) {
648 case CMD_APPEND:
649 if (certfile && sigfile)
650 return cert_append(certfile, sigfile);
651 else
652 return usage(argv[0]);
653 case CMD_DUMP:
654 if (certfile)
655 return cert_dump(certfile);
656 else
657 return usage(argv[0]);
658 case CMD_ISSUE:
659 if (certfile && pubkeyfile && seckeyfile)
660 return cert_issue(certfile, pubkeyfile, seckeyfile);
661 else
662 return usage(argv[0]);
663 case CMD_REVOKE:
664 if (certfile && pubkeydir)
665 return cert_process_revoker(certfile, pubkeydir);
666 else
667 return usage(argv[0]);
668 case CMD_VERIFY:
669 if (certfile && (pubkeyfile || pubkeydir))
670 return cert_verify(certfile, pubkeyfile, pubkeydir, msgfile);
671 else
672 return usage(argv[0]);
673 case CMD_NONE:
674 return usage(argv[0]);
675 }
676
677 /* unreachable */
678 return usage(argv[0]);
679 }
OpenWrt usign certificate wrapper