2 * Copyright (C) 2018 Daniel Golle <daniel@makrotopia.org>
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
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.
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>
38 #define CERT_BUF_LEN 4096
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 },
67 static const struct blobmsg_policy cert_cont_policy[CERT_CT_ATTR_MAX] = {
68 [CERT_CT_ATTR_PAYLOAD] = { .name = "ucert", .type = BLOBMSG_TYPE_TABLE },
71 enum cert_payload_attr {
72 CERT_PL_ATTR_CERTTYPE,
74 CERT_PL_ATTR_VALIDFROMTIME,
75 CERT_PL_ATTR_EXPIRETIME,
77 CERT_PL_ATTR_KEY_FINGERPRINT,
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 },
97 struct list_head list;
98 struct blob_attr **cert;
101 static int write_file(const char *filename, void *buf, size_t len, bool append) {
105 f = fopen(filename, append?"a":"w");
109 outlen = fwrite(buf, 1, len, f);
111 return (outlen == len);
114 static int cert_load(const char *certfile, struct list_head *chain) {
116 struct blob_attr *certtb[CERT_ATTR_MAX];
117 struct cert_object *cobj;
118 char filebuf[CERT_BUF_LEN];
122 f = fopen(certfile, "r");
126 len = fread(&filebuf, 1, CERT_BUF_LEN - 1, f);
130 ret = ferror(f) || !feof(f);
135 /* TODO: read more than one blob from file */
136 ret = blob_parse(filebuf, certtb, cert_policy, CERT_ATTR_MAX);
137 cobj = calloc(1, sizeof(*cobj));
138 cobj->cert = &certtb;
139 list_add_tail(&cobj->list, chain);
144 static int cert_append(const char *certfile, const char *pubkeyfile, const char *sigfile) {
145 fprintf(stderr, "not implemented\n");
149 static int cert_verify_blob(struct blob_attr *cert[CERT_ATTR_MAX],
150 const char *pubkeyfile, const char *pubkeydir) {
152 char msgfname[256], sigfname[256];
154 char tmpdir[] = "/tmp/ucert-XXXXXX";
156 if (mkdtemp(tmpdir) == NULL)
159 snprintf(msgfname, sizeof(msgfname) - 1, "%s/%s", tmpdir, "payload");
160 snprintf(sigfname, sizeof(sigfname) - 1, "%s/%s", tmpdir, "payload.sig");
162 for (i = 0; i < CERT_ATTR_MAX; i++) {
163 struct blob_attr *v = cert[i];
168 switch(cert_policy[i].type) {
169 case BLOB_ATTR_BINARY:
170 write_file(sigfname, blob_data(v), blob_len(v), false);
172 case BLOB_ATTR_NESTED:
173 write_file(msgfname, blob_data(v), blob_len(v), false);
178 ret = usign_v(msgfname, pubkeyfile, pubkeydir, sigfname, quiet);
187 static int chain_verify(const char *msgfile, const char *pubkeyfile,
188 const char *pubkeydir, struct list_head *chain) {
189 struct cert_object *cobj;
190 struct blob_attr *containertb[CERT_CT_ATTR_MAX];
191 struct blob_attr *payloadtb[CERT_PL_ATTR_MAX];
192 char tmpdir[] = "/tmp/ucert-XXXXXX";
193 char chainedpubkey[256] = {0};
194 char extsigfile[256] = {0};
198 if (mkdtemp(tmpdir) == NULL)
204 list_for_each_entry(cobj, chain, list) {
205 ret = cert_verify_blob(cobj->cert, chainedpubkey[0]?chainedpubkey:pubkeyfile, pubkeydir);
207 goto clean_and_return;
209 if (cobj->cert[CERT_ATTR_PAYLOAD]) {
215 blobmsg_parse(cert_cont_policy,
216 ARRAY_SIZE(cert_cont_policy),
218 blob_data(cobj->cert[CERT_ATTR_PAYLOAD]),
219 blob_len(cobj->cert[CERT_ATTR_PAYLOAD]));
220 if (!containertb[CERT_CT_ATTR_PAYLOAD]) {
222 fprintf(stderr, "no ucert in signed payload\n");
223 goto clean_and_return;
225 blobmsg_parse(cert_payload_policy,
226 ARRAY_SIZE(cert_payload_policy),
228 blobmsg_data(containertb[CERT_CT_ATTR_PAYLOAD]),
229 blobmsg_data_len(containertb[CERT_CT_ATTR_PAYLOAD]));
231 if (!payloadtb[CERT_PL_ATTR_CERTTYPE] ||
232 !payloadtb[CERT_PL_ATTR_VALIDFROMTIME] ||
233 !payloadtb[CERT_PL_ATTR_EXPIRETIME] ||
234 !payloadtb[CERT_PL_ATTR_PUBKEY]) {
236 fprintf(stderr, "missing mandatory ucert attributes\n");
237 goto clean_and_return;
239 certtype = blobmsg_get_u32(payloadtb[CERT_PL_ATTR_CERTTYPE]);
240 validfrom = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_VALIDFROMTIME]);
241 expiresat = blobmsg_get_u64(payloadtb[CERT_PL_ATTR_EXPIRETIME]);
243 if (certtype != CERTTYPE_AUTH) {
245 fprintf(stderr, "wrong certificate type\n");
246 goto clean_and_return;
249 gettimeofday(&tv, NULL);
250 if (tv.tv_sec < validfrom ||
251 tv.tv_sec >= expiresat) {
253 fprintf(stderr, "certificate expired\n");
254 goto clean_and_return;
257 snprintf(chainedpubkey, sizeof(chainedpubkey) - 1, "%s/%s", tmpdir, "chained-pubkey");
258 write_file(chainedpubkey,
259 blobmsg_data(payloadtb[CERT_PL_ATTR_PUBKEY]),
260 blobmsg_data_len(payloadtb[CERT_PL_ATTR_PUBKEY]),
264 snprintf(extsigfile, sizeof(extsigfile) - 1, "%s/%s", tmpdir, "ext-sig");
265 write_file(extsigfile,
266 blob_data(cobj->cert[CERT_ATTR_SIGNATURE]),
267 blob_len(cobj->cert[CERT_ATTR_SIGNATURE]),
269 checkmsg = ret = usign_v(msgfile,
270 chainedpubkey[0]?chainedpubkey:pubkeyfile,
271 pubkeydir, extsigfile, quiet);
274 fprintf(stderr, "stray trailing signature without anything to verify!\n");
281 fprintf(stderr, "missing signature to verify message!\n");
284 if (chainedpubkey[0])
285 unlink(chainedpubkey);
287 return ret | checkmsg;
290 static void cert_dump_blob(struct blob_attr *cert[CERT_ATTR_MAX]) {
293 for (i = 0; i < CERT_ATTR_MAX; i++) {
294 struct blob_attr *v = cert[i];
299 switch(cert_policy[i].type) {
300 case BLOB_ATTR_BINARY:
301 fprintf(stdout, "signature:\n---\n%s\n---\n", (char *) blob_data(v));
303 case BLOB_ATTR_NESTED:
304 fprintf(stdout, "payload:\n---\n%s\n---\n", blobmsg_format_json_indent(blob_data(v), false, 0));
310 static int cert_dump(const char *certfile) {
311 struct cert_object *cobj;
312 static LIST_HEAD(certchain);
314 if (cert_load(certfile, &certchain)) {
315 fprintf(stderr, "cannot parse cert\n");
319 list_for_each_entry(cobj, &certchain, list)
320 cert_dump_blob(cobj->cert);
325 static int cert_issue(const char *certfile, const char *pubkeyfile, const char *seckeyfile) {
326 struct blob_buf certbuf;
327 struct blob_buf payloadbuf;
336 char fname[256], sfname[256];
338 char tmpdir[] = "/tmp/ucert-XXXXXX";
340 if (stat(certfile, &st) == 0) {
341 fprintf(stderr, "certfile %s exists, won't overwrite.\n", certfile);
345 pkf = fopen(pubkeyfile, "r");
349 pklen = fread(pkb, 1, 512, pkf);
357 if (usign_f_pubkey(pkfp, pubkeyfile))
360 gettimeofday(&tv, NULL);
362 if (mkdtemp(tmpdir) == NULL)
365 while (revoker >= 0) {
366 blob_buf_init(&payloadbuf, 0);
367 c = blobmsg_open_table(&payloadbuf, "ucert");
368 blobmsg_add_u32(&payloadbuf, "certtype", revoker?CERTTYPE_REVOKE:CERTTYPE_AUTH);
369 blobmsg_add_u64(&payloadbuf, "validfrom", tv.tv_sec);
371 blobmsg_add_u64(&payloadbuf, "expiresat", tv.tv_sec + 60 * 60 * 24 * 365);
372 blobmsg_add_string(&payloadbuf, "pubkey", pkb);
374 blobmsg_add_string(&payloadbuf, "fingerprint", pkfp);
377 blobmsg_close_table(&payloadbuf, c);
379 snprintf(fname, sizeof(fname) - 1, "%s/%s", tmpdir, revoker?"revoker":"payload");
380 write_file(fname, blob_data(payloadbuf.head), blob_len(payloadbuf.head), false);
382 snprintf(sfname, sizeof(sfname) - 1, "%s/%s", tmpdir, revoker?"revoker.sig":"payload.sig");
383 if (usign_s(fname, seckeyfile, sfname, quiet))
386 sigf = fopen(sfname, "r");
390 siglen = fread(sigb, 1, 1024, sigf);
394 sigb[siglen-1] = '\0';
400 blob_buf_init(&certbuf, 0);
401 blob_put(&certbuf, CERT_ATTR_SIGNATURE, sigb, siglen);
402 blob_put(&certbuf, CERT_ATTR_PAYLOAD, blob_data(payloadbuf.head), blob_len(payloadbuf.head));
403 snprintf(fname, sizeof(fname) - 1, "%s%s", certfile, revoker?".revoke":"");
404 write_file(fname, certbuf.head, blob_raw_len(certbuf.head), false);
413 static int cert_process_revoker(const char *certfile) {
414 fprintf(stderr, "not implemented\n");
418 static int cert_verify(const char *certfile, const char *pubkeyfile, const char *pubkeydir, const char *msgfile) {
419 static LIST_HEAD(certchain);
421 if (cert_load(certfile, &certchain)) {
422 fprintf(stderr, "cannot parse cert\n");
426 return chain_verify(msgfile, pubkeyfile, pubkeydir, &certchain);
429 static int usage(const char *cmd)
432 "Usage: %s <command> <options>\n"
434 " -A: append (needs -c and -p and/or -x)\n"
436 " -I: issue cert and revoker (needs -c and -p and -s)\n"
437 " -R: process revoker certificate (needs -c)\n"
438 " -V: verify (needs -c and -p|-P)\n"
440 " -c <file>: certificate file\n"
441 " -m <file>: message file (verify only)\n"
442 " -p <file>: public key file\n"
443 " -P <path>: public key directory (verify only)\n"
444 " -q: quiet (do not print verification result, use return code only)\n"
445 " -s <file>: secret key file (issue only)\n"
446 " -x <file>: signature file\n"
452 int main(int argc, char *argv[]) {
454 const char *msgfile = NULL;
455 const char *sigfile = NULL;
456 const char *pubkeyfile = NULL;
457 const char *pubkeydir = NULL;
458 const char *certfile = NULL;
459 const char *seckeyfile = NULL;
462 while ((ch = getopt(argc, argv, "ADIRVc:m:p:P:qs:x:")) != -1) {
501 return usage(argv[0]);
507 if (certfile && (pubkeyfile || sigfile))
508 return cert_append(certfile, pubkeyfile, sigfile);
510 return usage(argv[0]);
513 return cert_dump(certfile);
515 return usage(argv[0]);
517 if (certfile && pubkeyfile && seckeyfile)
518 return cert_issue(certfile, pubkeyfile, seckeyfile);
520 return usage(argv[0]);
523 return cert_process_revoker(certfile);
525 return usage(argv[0]);
527 if (certfile && (pubkeyfile || pubkeydir))
528 return cert_verify(certfile, pubkeyfile, pubkeydir, msgfile);
530 return usage(argv[0]);
532 return usage(argv[0]);
536 return usage(argv[0]);