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]);