added listener.h to charon_SOURCES
[strongswan.git] / src / scepclient / scepclient.c
1 /*
2 * Copyright (C) 2005 Jan Hutter, Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 /**
17 * @file main.c
18 * @brief scepclient main program
19 */
20
21 /**
22 * @mainpage SCEP for Linux strongSwan
23 *
24 * Documentation of SCEP for Linux StrongSwan
25 */
26
27 #include <stdarg.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <getopt.h>
32 #include <ctype.h>
33 #include <unistd.h>
34 #include <time.h>
35
36 #include <freeswan.h>
37
38 #include <library.h>
39 #include <debug.h>
40 #include <asn1/asn1.h>
41 #include <asn1/oid.h>
42 #include <utils/optionsfrom.h>
43 #include <utils/enumerator.h>
44 #include <crypto/crypters/crypter.h>
45 #include <crypto/proposal/proposal_keywords.h>
46 #include <credentials/keys/private_key.h>
47 #include <credentials/keys/public_key.h>
48
49 #include "../pluto/constants.h"
50 #include "../pluto/defs.h"
51 #include "../pluto/log.h"
52 #include "../pluto/pkcs7.h"
53 #include "../pluto/certs.h"
54
55 #include "pkcs10.h"
56 #include "scep.h"
57
58 /*
59 * definition of some defaults
60 */
61
62 /* default name of DER-encoded PKCS#1 private key file */
63 #define DEFAULT_FILENAME_PKCS1 "myKey.der"
64
65 /* default name of DER-encoded PKCS#10 certificate request file */
66 #define DEFAULT_FILENAME_PKCS10 "myReq.der"
67
68 /* default name of DER-encoded PKCS#7 file */
69 #define DEFAULT_FILENAME_PKCS7 "pkcs7.der"
70
71 /* default name of DER-encoded self-signed X.509 certificate file */
72 #define DEFAULT_FILENAME_CERT_SELF "selfCert.der"
73
74 /* default name of DER-encoded X.509 certificate file */
75 #define DEFAULT_FILENAME_CERT "myCert.der"
76
77 /* default name of DER-encoded CA cert file used for key encipherment */
78 #define DEFAULT_FILENAME_CACERT_ENC "caCert.der"
79
80 /* default name of the der encoded CA cert file used for signature verification */
81 #define DEFAULT_FILENAME_CACERT_SIG "caCert.der"
82
83 /* default prefix of the der encoded CA certificates received from the SCEP server */
84 #define DEFAULT_FILENAME_PREFIX_CACERT "caCert.der"
85
86 /* default certificate validity */
87 #define DEFAULT_CERT_VALIDITY 5 * 3600 * 24 * 365 /* seconds */
88
89 /* default polling time interval in SCEP manual mode */
90 #define DEFAULT_POLL_INTERVAL 20 /* seconds */
91
92 /* default key length for self-generated RSA keys */
93 #define DEFAULT_RSA_KEY_LENGTH 2048 /* bits */
94
95 /* default distinguished name */
96 #define DEFAULT_DN "C=CH, O=Linux strongSwan, CN="
97
98 /* challenge password buffer size */
99 #define MAX_PASSWORD_LENGTH 256
100
101 /* Max length of filename for tempfile */
102 #define MAX_TEMP_FILENAME_LENGTH 256
103
104
105 /* current scepclient version */
106 static const char *scepclient_version = "1.0";
107
108 /* by default the CRL policy is lenient */
109 bool strict_crl_policy = FALSE;
110
111 /* by default pluto does not check crls dynamically */
112 long crl_check_interval = 0;
113
114 /* by default pluto logs out after every smartcard use */
115 bool pkcs11_keep_state = FALSE;
116
117 /* options read by optionsfrom */
118 options_t *options;
119
120 /*
121 * Global variables
122 */
123
124 private_key_t *private_key = NULL;
125 public_key_t *public_key = NULL;
126
127 chunk_t pkcs1;
128 chunk_t pkcs7;
129 chunk_t subject;
130 chunk_t challengePassword;
131 chunk_t serialNumber;
132 chunk_t transID;
133 chunk_t fingerprint;
134 chunk_t issuerAndSubject;
135 chunk_t getCertInitial;
136 chunk_t scep_response;
137 cert_t cert;
138
139 x509cert_t *x509_signer = NULL;
140 x509cert_t *x509_ca_enc = NULL;
141 x509cert_t *x509_ca_sig = NULL;
142 generalName_t *subjectAltNames = NULL;
143 pkcs10_t *pkcs10 = NULL;
144
145 /**
146 * @brief exit scepclient
147 *
148 * @param status 0 = OK, 1 = general discomfort
149 */
150 static void
151 exit_scepclient(err_t message, ...)
152 {
153 int status = 0;
154
155 DESTROY_IF(private_key);
156 DESTROY_IF(public_key);
157 free(pkcs1.ptr);
158 free(pkcs7.ptr);
159 free(subject.ptr);
160 free(serialNumber.ptr);
161 free(transID.ptr);
162 free(fingerprint.ptr);
163 free(issuerAndSubject.ptr);
164 free(getCertInitial.ptr);
165 free(scep_response.ptr);
166
167 free_generalNames(subjectAltNames, TRUE);
168 if (x509_signer != NULL)
169 {
170 x509_signer->subjectAltName = NULL;
171 }
172 free_x509cert(x509_signer);
173 free_x509cert(x509_ca_enc);
174 free_x509cert(x509_ca_sig);
175 pkcs10_free(pkcs10);
176 options->destroy(options);
177
178 /* print any error message to stderr */
179 if (message != NULL && *message != '\0')
180 {
181 va_list args;
182 char m[LOG_WIDTH]; /* longer messages will be truncated */
183
184 va_start(args, message);
185 vsnprintf(m, sizeof(m), message, args);
186 va_end(args);
187
188 fprintf(stderr, "error: %s\n", m);
189 status = -1;
190 }
191 library_deinit();
192 close_log();
193 exit(status);
194 }
195
196 /**
197 * @brief prints the program version and exits
198 *
199 */
200 static void
201 version(void)
202 {
203 printf("scepclient %s\n", scepclient_version);
204 exit_scepclient(NULL);
205 }
206
207 /**
208 * @brief prints the usage of the program to the stderr output
209 *
210 * If message is set, program is exitet with 1 (error)
211 * @param message message in case of an error
212 */
213 static void
214 usage(const char *message)
215 {
216 fprintf(stderr,
217 "Usage: scepclient\n"
218 " --help (-h) show usage and exit\n"
219 " --version (-v) show version and exit\n"
220 " --quiet (-q) do not write log output to stderr\n"
221 " --in (-i) <type>[=<filename>] use <filename> of <type> for input \n"
222 " <type> = pkcs1 | cacert-enc | cacert-sig\n"
223 " - if no pkcs1 input is defined, a \n"
224 " RSA key will be generated\n"
225 " - if no filename is given, default is used\n"
226 " --out (-o) <type>[=<filename>] write output of <type> to <filename>\n"
227 " multiple outputs are allowed\n"
228 " <type> = pkcs1 | pkcs10 | pkcs7 | cert-self | cert | cacert\n"
229 " - type cacert defines filename prefix of\n"
230 " received CA certificate(s)\n"
231 " - if no filename is given, default is used\n"
232 " --optionsfrom (-+) <filename> reads additional options from given file\n"
233 " --force (-f) force existing file(s)\n"
234 "\n"
235 "Options for key generation (pkcs1):\n"
236 " --keylength (-k) <bits> key length for RSA key generation\n"
237 "(default: 2048 bits)\n"
238 "\n"
239 "Options for validity:\n"
240 " --days (-D) <days> validity in days\n"
241 " --startdate (-S) <YYMMDDHHMMSS>Z not valid before date\n"
242 " --enddate (-E) <YYMMDDHHMMSS>Z not valid after date\n"
243 "\n"
244 "Options for request generation (pkcs10):\n"
245 " --dn (-d) <dn> comma separated list of distinguished names\n"
246 " --subjectAltName (-s) <t>=<v> include subjectAltName in certificate request\n"
247 " <t> = email | dns | ip \n"
248 " --password (-p) <pw> challenge password\n"
249 " - if pw is '%%prompt', password gets prompted for\n"
250 " --algorithm (-a) <algo> use specified algorithm for PKCS#7 encryption\n"
251 " <algo> = des | 3des (default) | aes128| aes192 | \n"
252 " aes256 | camellia128 | camellia192 | camellia256\n"
253 "\n"
254 "Options for enrollment (cert):\n"
255 " --url (-u) <url> url of the SCEP server\n"
256 " --method (-m) post | get http request type\n"
257 " --interval (-t) <seconds> manual mode poll interval in seconds (default 20s)\n"
258 " --maxpolltime (-x) <seconds> max poll time in seconds when in manual mode\n"
259 " (default: unlimited)\n"
260 #ifdef DEBUG
261 "\n"
262 "Debugging output:\n"
263 " --debug-all (-A) show everything except private\n"
264 " --debug-parsing (-P) show parsing relevant stuff\n"
265 " --debug-raw (-R) show raw hex dumps\n"
266 " --debug-control (-C) show control flow output\n"
267 " --debug-controlmore (-M) show more control flow\n"
268 " --debug-private (-X) show sensitive data (private keys, etc.)\n"
269 #endif
270 );
271 exit_scepclient(message);
272 }
273
274 /**
275 * Log loaded plugins
276 */
277 static void print_plugins()
278 {
279 char buf[BUF_LEN], *plugin;
280 int len = 0;
281 enumerator_t *enumerator;
282
283 enumerator = lib->plugins->create_plugin_enumerator(lib->plugins);
284 while (len < BUF_LEN && enumerator->enumerate(enumerator, &plugin))
285 {
286 len += snprintf(&buf[len], BUF_LEN-len, "%s ", plugin);
287 }
288 enumerator->destroy(enumerator);
289 DBG1(" loaded plugins: %s", buf);
290 }
291
292 /**
293 * @brief main of scepclient
294 *
295 * @param argc number of arguments
296 * @param argv pointer to the argument values
297 */
298 int main(int argc, char **argv)
299 {
300 /* external values */
301 extern char * optarg;
302 extern int optind;
303
304 /* type of input and output files */
305 typedef enum {
306 PKCS1 = 0x01,
307 PKCS10 = 0x02,
308 PKCS7 = 0x04,
309 CERT_SELF = 0x08,
310 CERT = 0x10,
311 CACERT_ENC = 0x20,
312 CACERT_SIG = 0x40
313 } scep_filetype_t;
314
315 /* filetype to read from, defaults to "generate a key" */
316 scep_filetype_t filetype_in = 0;
317
318 /* filetype to write to, no default here */
319 scep_filetype_t filetype_out = 0;
320
321 /* input files */
322 char *file_in_pkcs1 = DEFAULT_FILENAME_PKCS1;
323 char *file_in_cacert_enc = DEFAULT_FILENAME_CACERT_ENC;
324 char *file_in_cacert_sig = DEFAULT_FILENAME_CACERT_SIG;
325
326 /* output files */
327 char *file_out_pkcs1 = DEFAULT_FILENAME_PKCS1;
328 char *file_out_pkcs10 = DEFAULT_FILENAME_PKCS10;
329 char *file_out_pkcs7 = DEFAULT_FILENAME_PKCS7;
330 char *file_out_cert_self = DEFAULT_FILENAME_CERT_SELF;
331 char *file_out_cert = DEFAULT_FILENAME_CERT;
332 char *file_out_prefix_cacert = DEFAULT_FILENAME_PREFIX_CACERT;
333
334 /* by default user certificate is requested */
335 bool request_ca_certificate = FALSE;
336
337 /* by default existing files are not overwritten */
338 bool force = FALSE;
339
340 /* length of RSA key in bits */
341 u_int rsa_keylength = DEFAULT_RSA_KEY_LENGTH;
342
343 /* validity of self-signed certificate */
344 time_t validity = DEFAULT_CERT_VALIDITY;
345 time_t notBefore = 0;
346 time_t notAfter = 0;
347
348 /* distinguished name for requested certificate, ASCII format */
349 char *distinguishedName = NULL;
350
351 /* challenge password */
352 char challenge_password_buffer[MAX_PASSWORD_LENGTH];
353
354 /* symmetric encryption algorithm used by pkcs7, default is 3DES */
355 int pkcs7_symmetric_cipher = OID_3DES_EDE_CBC;
356
357 /* digest algorithm used by pkcs7, default is SHA-1 */
358 int pkcs7_digest_alg = OID_SHA1;
359
360 /* signature algorithm used by pkcs10, default is SHA-1 with RSA encryption */
361 int pkcs10_signature_alg = OID_SHA1;
362
363 /* URL of the SCEP-Server */
364 char *scep_url = NULL;
365
366 /* http request method, default is GET */
367 bool http_get_request = TRUE;
368
369 /* poll interval time in manual mode in seconds */
370 u_int poll_interval = DEFAULT_POLL_INTERVAL;
371
372 /* maximum poll time */
373 u_int max_poll_time = 0;
374
375 err_t ugh = NULL;
376
377 /* initialize global variables */
378 pkcs1 = chunk_empty;
379 pkcs7 = chunk_empty;
380 serialNumber = chunk_empty;
381 transID = chunk_empty;
382 fingerprint = chunk_empty;
383 issuerAndSubject = chunk_empty;
384 challengePassword = chunk_empty;
385 getCertInitial = chunk_empty;
386 scep_response = chunk_empty;
387 log_to_stderr = TRUE;
388
389 /* initialize library and optionsfrom */
390 library_init(STRONGSWAN_CONF);
391 options = options_create();
392
393 for (;;)
394 {
395 static const struct option long_opts[] = {
396 /* name, has_arg, flag, val */
397 { "help", no_argument, NULL, 'h' },
398 { "version", no_argument, NULL, 'v' },
399 { "optionsfrom", required_argument, NULL, '+' },
400 { "quiet", no_argument, NULL, 'q' },
401 { "in", required_argument, NULL, 'i' },
402 { "out", required_argument, NULL, 'o' },
403 { "force", no_argument, NULL, 'f' },
404 { "keylength", required_argument, NULL, 'k' },
405 { "dn", required_argument, NULL, 'd' },
406 { "days", required_argument, NULL, 'D' },
407 { "startdate", required_argument, NULL, 'S' },
408 { "enddate", required_argument, NULL, 'E' },
409 { "subjectAltName", required_argument, NULL, 's' },
410 { "password", required_argument, NULL, 'p' },
411 { "algorithm", required_argument, NULL, 'a' },
412 { "url", required_argument, NULL, 'u' },
413 { "method", required_argument, NULL, 'm' },
414 { "interval", required_argument, NULL, 't' },
415 { "maxpolltime", required_argument, NULL, 'x' },
416 #ifdef DEBUG
417 { "debug-all", no_argument, NULL, 'A' },
418 { "debug-parsing", no_argument, NULL, 'P'},
419 { "debug-raw", no_argument, NULL, 'R'},
420 { "debug-control", no_argument, NULL, 'C'},
421 { "debug-controlmore", no_argument, NULL, 'M'},
422 { "debug-private", no_argument, NULL, 'X'},
423 #endif
424 { 0,0,0,0 }
425 };
426
427 /* parse next option */
428 int c = getopt_long(argc, argv, "hv+:qi:o:fk:d:s:p:a:u:m:t:x:APRCMS", long_opts, NULL);
429
430 switch (c)
431 {
432 case EOF: /* end of flags */
433 break;
434
435 case 'h': /* --help */
436 usage(NULL);
437
438 case 'v': /* --version */
439 version();
440
441 case 'q': /* --quiet */
442 log_to_stderr = FALSE;
443 continue;
444
445 case 'i': /* --in <type> [= <filename>] */
446 {
447 char *filename = strstr(optarg, "=");
448
449 if (filename)
450 {
451 /* replace '=' by '\0' */
452 *filename = '\0';
453 /* set pointer to start of filename */
454 filename++;
455 }
456 if (strcaseeq("pkcs1", optarg))
457 {
458 filetype_in |= PKCS1;
459 if (filename)
460 file_in_pkcs1 = filename;
461 }
462 else if (strcaseeq("cacert-enc", optarg))
463 {
464 filetype_in |= CACERT_ENC;
465 if (filename)
466 file_in_cacert_enc = filename;
467 }
468 else if (strcaseeq("cacert-sig", optarg))
469 {
470 filetype_in |= CACERT_SIG;
471 if (filename)
472 file_in_cacert_sig = filename;
473 }
474 else
475 {
476 usage("invalid --in file type");
477 }
478 continue;
479 }
480
481 case 'o': /* --out <type> [= <filename>] */
482 {
483 char *filename = strstr(optarg, "=");
484
485 if (filename)
486 {
487 /* replace '=' by '\0' */
488 *filename = '\0';
489 /* set pointer to start of filename */
490 filename++;
491 }
492 if (strcaseeq("pkcs1", optarg))
493 {
494 filetype_out |= PKCS1;
495 if (filename)
496 file_out_pkcs1 = filename;
497 }
498 else if (strcaseeq("pkcs10", optarg))
499 {
500 filetype_out |= PKCS10;
501 if (filename)
502 file_out_pkcs10 = filename;
503 }
504 else if (strcaseeq("pkcs7", optarg))
505 {
506 filetype_out |= PKCS7;
507 if (filename)
508 file_out_pkcs7 = filename;
509 }
510 else if (strcaseeq("cert-self", optarg))
511 {
512 filetype_out |= CERT_SELF;
513 if (filename)
514 file_out_cert_self = filename;
515 }
516 else if (strcaseeq("cert", optarg))
517 {
518 filetype_out |= CERT;
519 if (filename)
520 file_out_cert = filename;
521 }
522 else if (strcaseeq("cacert", optarg))
523 {
524 request_ca_certificate = TRUE;
525 if (filename)
526 file_out_prefix_cacert = filename;
527 }
528 else
529 {
530 usage("invalid --out file type");
531 }
532 continue;
533 }
534
535 case 'f': /* --force */
536 force = TRUE;
537 continue;
538
539 case '+': /* --optionsfrom <filename> */
540 if (!options->from(options, optarg, &argc, &argv, optind))
541 {
542 exit_scepclient("optionsfrom failed");
543 }
544 continue;
545
546 case 'k': /* --keylength <length> */
547 {
548 div_t q;
549
550 rsa_keylength = atoi(optarg);
551 if (rsa_keylength == 0)
552 usage("invalid keylength");
553
554 /* check if key length is a multiple of 8 bits */
555 q = div(rsa_keylength, 2*BITS_PER_BYTE);
556 if (q.rem != 0)
557 {
558 exit_scepclient("keylength is not a multiple of %d bits!"
559 , 2*BITS_PER_BYTE);
560 }
561 continue;
562 }
563
564 case 'D': /* --days */
565 if (optarg == NULL || !isdigit(optarg[0]))
566 usage("missing number of days");
567 {
568 char *endptr;
569 long days = strtol(optarg, &endptr, 0);
570
571 if (*endptr != '\0' || endptr == optarg
572 || days <= 0)
573 usage("<days> must be a positive number");
574 validity = 24*3600*days;
575 }
576 continue;
577
578 case 'S': /* --startdate */
579 if (optarg == NULL || strlen(optarg) != 13 || optarg[12] != 'Z')
580 usage("date format must be YYMMDDHHMMSSZ");
581 {
582 chunk_t date = { optarg, 13 };
583 notBefore = asn1_to_time(&date, ASN1_UTCTIME);
584 }
585 continue;
586
587 case 'E': /* --enddate */
588 if (optarg == NULL || strlen(optarg) != 13 || optarg[12] != 'Z')
589 usage("date format must be YYMMDDHHMMSSZ");
590 {
591 chunk_t date = { optarg, 13 };
592 notAfter = asn1_to_time(&date, ASN1_UTCTIME);
593 }
594 continue;
595
596 case 'd': /* --dn */
597 if (distinguishedName)
598 usage("only one distinguished name allowed");
599 distinguishedName = optarg;
600 continue;
601
602 case 's': /* --subjectAltName */
603 {
604 generalNames_t kind;
605 char *value = strstr(optarg, "=");
606
607 if (value)
608 {
609 /* replace '=' by '\0' */
610 *value = '\0';
611 /* set pointer to start of value */
612 value++;
613 }
614
615 if (strcaseeq("email", optarg))
616 {
617 kind = GN_RFC822_NAME;
618 }
619 else if (strcaseeq("dns", optarg))
620 {
621 kind = GN_DNS_NAME;
622 }
623 else if (strcaseeq("ip", optarg))
624 {
625 kind = GN_IP_ADDRESS;
626 }
627 else
628 {
629 usage("invalid --subjectAltName type");
630 continue;
631 }
632 pkcs10_add_subjectAltName(&subjectAltNames, kind, value);
633 continue;
634 }
635
636 case 'p': /* --password */
637 if (challengePassword.len > 0)
638 {
639 usage("only one challenge password allowed");
640 }
641 if (strcaseeq("%prompt", optarg))
642 {
643 printf("Challenge password: ");
644 if (fgets(challenge_password_buffer, sizeof(challenge_password_buffer)-1, stdin))
645 {
646 challengePassword.ptr = challenge_password_buffer;
647 /* discard the terminating '\n' from the input */
648 challengePassword.len = strlen(challenge_password_buffer) - 1;
649 }
650 else
651 {
652 usage("challenge password could not be read");
653 }
654 }
655 else
656 {
657 challengePassword.ptr = optarg;
658 challengePassword.len = strlen(optarg);
659 }
660 continue;
661
662 case 'u': /* -- url */
663 if (scep_url)
664 {
665 usage("only one URL argument allowed");
666 }
667 scep_url = optarg;
668 continue;
669
670 case 'm': /* --method */
671 if (strcaseeq("get", optarg))
672 {
673 http_get_request = TRUE;
674 }
675 else if (strcaseeq("post", optarg))
676 {
677 http_get_request = FALSE;
678 }
679 else
680 {
681 usage("invalid http request method specified");
682 }
683 continue;
684
685 case 't': /* --interval */
686 poll_interval = atoi(optarg);
687 if (poll_interval <= 0)
688 {
689 usage("invalid interval specified");
690 }
691 continue;
692
693 case 'x': /* --maxpolltime */
694 max_poll_time = atoi(optarg);
695 if (max_poll_time < 0)
696 {
697 usage("invalid maxpolltime specified");
698 }
699 continue;
700
701 case 'a': /*--algorithm */
702 {
703 const proposal_token_t *token;
704
705 token = proposal_get_token(optarg, strlen(optarg));
706 if (token == NULL || token->type != ENCRYPTION_ALGORITHM)
707 {
708 usage("invalid algorithm specified");
709 }
710 pkcs7_symmetric_cipher = encryption_algorithm_to_oid(
711 token->algorithm, token->keysize);
712 if (pkcs7_symmetric_cipher == OID_UNKNOWN)
713 {
714 usage("unsupported encryption algorithm specified");
715 }
716 continue;
717 }
718 #ifdef DEBUG
719 case 'A': /* --debug-all */
720 base_debugging |= DBG_ALL;
721 continue;
722 case 'P': /* debug parsing */
723 base_debugging |= DBG_PARSING;
724 continue;
725 case 'R': /* debug raw */
726 base_debugging |= DBG_RAW;
727 continue;
728 case 'C': /* debug control */
729 base_debugging |= DBG_CONTROL;
730 continue;
731 case 'M': /* debug control more */
732 base_debugging |= DBG_CONTROLMORE;
733 continue;
734 case 'X': /* debug private */
735 base_debugging |= DBG_PRIVATE;
736 continue;
737 #endif
738 default:
739 usage("unknown option");
740 }
741 /* break from loop */
742 break;
743 }
744 cur_debugging = base_debugging;
745
746 init_log("scepclient");
747
748 /* load plugins, further infrastructure may need it */
749 lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR,
750 lib->settings->get_str(lib->settings, "scepclient.load", PLUGINS));
751 print_plugins();
752
753 if ((filetype_out == 0) && (!request_ca_certificate))
754 {
755 usage ("--out filetype required");
756 }
757 if (request_ca_certificate && (filetype_out > 0 || filetype_in > 0))
758 {
759 usage("in CA certificate request, no other --in or --out option allowed");
760 }
761
762 /* check if url is given, if cert output defined */
763 if (((filetype_out & CERT) || request_ca_certificate) && !scep_url)
764 {
765 usage("URL of SCEP server required");
766 }
767
768 /* check for sanity of --in/--out */
769 if (!filetype_in && (filetype_in > filetype_out))
770 {
771 usage("cannot generate --out of given --in!");
772 }
773
774 /*
775 * input of PKCS#1 file
776 */
777 if (filetype_in & PKCS1) /* load an RSA key pair from file */
778 {
779 prompt_pass_t pass = { "", FALSE, STDIN_FILENO };
780 char *path = concatenate_paths(PRIVATE_KEY_PATH, file_in_pkcs1);
781
782 private_key = load_private_key(path, &pass, KEY_RSA);
783 }
784 else /* generate an RSA key pair */
785 {
786 private_key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
787 BUILD_KEY_SIZE, rsa_keylength,
788 BUILD_END);
789 }
790 if (private_key == NULL)
791 {
792 exit_scepclient("no RSA private key available");
793 }
794 public_key = private_key->get_public_key(private_key);
795
796 /* check for minimum key length */
797 if (private_key->get_keysize(private_key) < RSA_MIN_OCTETS)
798 {
799 exit_scepclient("length of RSA key has to be at least %d bits"
800 ,RSA_MIN_OCTETS * BITS_PER_BYTE);
801 }
802
803 /*
804 * input of PKCS#10 file
805 */
806 if (filetype_in & PKCS10)
807 {
808 /* user wants to load a pkcs10 request
809 * operation is not yet supported
810 * would require a PKCS#10 parsing function
811
812 pkcs10 = pkcs10_read_from_file(file_in_pkcs10);
813
814 */
815 }
816 else
817 {
818 char buf[IDTOA_BUF];
819 chunk_t dn = chunk_empty;
820
821 dn.ptr = buf;
822
823 if (distinguishedName == NULL)
824 {
825 char buf[BUF_LEN];
826 int n = sprintf(buf, DEFAULT_DN);
827
828 /* set the common name to the hostname */
829 if (gethostname(buf + n, BUF_LEN - n) || strlen(buf) == n)
830 {
831 exit_scepclient("no hostname defined, use "
832 "--dn <distinguished name> option");
833 }
834 distinguishedName = buf;
835 }
836
837 DBG(DBG_CONTROL,
838 DBG_log("dn: '%s'", distinguishedName);
839 )
840 ugh = atodn(distinguishedName, &dn);
841 if (ugh != NULL)
842 {
843 exit_scepclient(ugh);
844 }
845
846 subject = chunk_clone(dn);
847
848 DBG(DBG_CONTROL,
849 DBG_log("building pkcs10 object:")
850 )
851 pkcs10 = pkcs10_build(private_key, public_key, subject,
852 challengePassword, subjectAltNames,
853 pkcs10_signature_alg);
854 fingerprint = scep_generate_pkcs10_fingerprint(pkcs10->request);
855 plog(" fingerprint: %s", fingerprint.ptr);
856 }
857
858 /*
859 * output of PKCS#10 file
860 */
861 if (filetype_out & PKCS10)
862 {
863 char *path = concatenate_paths(REQ_PATH, file_out_pkcs10);
864
865 if (!chunk_write(pkcs10->request, path, "pkcs10", 0022, force))
866 exit_scepclient("could not write pkcs10 file '%s'", path);
867
868 filetype_out &= ~PKCS10; /* delete PKCS10 flag */
869 }
870
871 if (!filetype_out)
872 {
873 exit_scepclient(NULL); /* no further output required */
874 }
875
876 /*
877 * output of PKCS#1 file
878 */
879 if (filetype_out & PKCS1)
880 {
881 char *path = concatenate_paths(PRIVATE_KEY_PATH, file_out_pkcs1);
882
883 DBG(DBG_CONTROL,
884 DBG_log("building pkcs1 object:")
885 )
886 pkcs1 = private_key->get_encoding(private_key);
887
888 if (!chunk_write(pkcs1, path, "pkcs1", 0066, force))
889 exit_scepclient("could not write pkcs1 file '%s'", path);
890
891 filetype_out &= ~PKCS1; /* delete PKCS1 flag */
892 }
893
894 if (!filetype_out)
895 {
896 exit_scepclient(NULL); /* no further output required */
897 }
898
899 scep_generate_transaction_id(public_key, &transID, &serialNumber);
900 plog(" transaction ID: %.*s", (int)transID.len, transID.ptr);
901
902 /* generate a self-signed X.509 certificate */
903 x509_signer = malloc_thing(x509cert_t);
904 *x509_signer = empty_x509cert;
905 x509_signer->serialNumber = serialNumber;
906 x509_signer->sigAlg = OID_SHA1_WITH_RSA;
907 x509_signer->issuer = subject;
908 x509_signer->notBefore = (notBefore)? notBefore
909 : time(NULL);
910 x509_signer->notAfter = (notAfter)? notAfter
911 : x509_signer->notBefore + validity;
912 x509_signer->subject = subject;
913 x509_signer->subjectAltName = subjectAltNames;
914 build_x509cert(x509_signer, public_key, private_key);
915
916 /*
917 * output of self-signed X.509 certificate file
918 */
919 if (filetype_out & CERT_SELF)
920 {
921 char *path = concatenate_paths(HOST_CERT_PATH, file_out_cert_self);
922
923 if (!chunk_write(x509_signer->certificate, path, "self-signed cert", 0022, force))
924 exit_scepclient("could not write self-signed cert file '%s'", path);
925 ;
926 filetype_out &= ~CERT_SELF; /* delete CERT_SELF flag */
927 }
928
929 if (!filetype_out)
930 {
931 exit_scepclient(NULL); /* no further output required */
932 }
933
934 /*
935 * load ca encryption certificate
936 */
937 {
938 char *path = concatenate_paths(CA_CERT_PATH, file_in_cacert_enc);
939 cert_t cert;
940
941 if (!load_cert(path, "encryption cacert", &cert))
942 {
943 exit_scepclient("could not load encryption cacert file '%s'", path);
944 }
945 x509_ca_enc = cert.u.x509;
946 }
947
948 /*
949 * input of PKCS#7 file
950 */
951 if (filetype_in & PKCS7)
952 {
953 /* user wants to load a pkcs7 encrypted request
954 * operation is not yet supported!
955 * would require additional parsing of transaction-id
956
957 pkcs7 = pkcs7_read_from_file(file_in_pkcs7);
958
959 */
960 }
961 else
962 {
963 DBG(DBG_CONTROL,
964 DBG_log("building pkcs7 request")
965 )
966 pkcs7 = scep_build_request(pkcs10->request
967 , transID, SCEP_PKCSReq_MSG
968 , x509_ca_enc, pkcs7_symmetric_cipher
969 , x509_signer, pkcs7_digest_alg, private_key);
970 }
971
972 /*
973 * output pkcs7 encrypted and signed certificate request
974 */
975 if (filetype_out & PKCS7)
976 {
977 char *path = concatenate_paths(REQ_PATH, file_out_pkcs7);
978
979 if (!chunk_write(pkcs7, path, "pkcs7 encrypted request", 0022, force))
980 exit_scepclient("could not write pkcs7 file '%s'", path);
981 ;
982 filetype_out &= ~PKCS7; /* delete PKCS7 flag */
983 }
984
985 if (!filetype_out)
986 {
987 exit_scepclient(NULL); /* no further output required */
988 }
989
990 /*
991 * output certificate fetch from SCEP server
992 */
993 if (filetype_out & CERT)
994 {
995 char *path = concatenate_paths(CA_CERT_PATH, file_in_cacert_sig);
996 cert_t cert;
997 time_t poll_start;
998
999 x509cert_t *certs = NULL;
1000 chunk_t envelopedData = chunk_empty;
1001 chunk_t certData = chunk_empty;
1002 contentInfo_t data = empty_contentInfo;
1003 scep_attributes_t attrs = empty_scep_attributes;
1004
1005 if (!load_cert(path, "signature cacert", &cert))
1006 exit_scepclient("could not load signature cacert file '%s'", path);
1007 x509_ca_sig = cert.u.x509;
1008
1009 if (!scep_http_request(scep_url, pkcs7, SCEP_PKI_OPERATION,
1010 http_get_request, &scep_response))
1011 {
1012 exit_scepclient("did not receive a valid scep response");
1013 }
1014 ugh = scep_parse_response(scep_response, transID, &data, &attrs
1015 , x509_ca_sig);
1016 if (ugh != NULL)
1017 {
1018 exit_scepclient(ugh);
1019 }
1020
1021 /* in case of manual mode, we are going into a polling loop */
1022 if (attrs.pkiStatus == SCEP_PENDING)
1023 {
1024 plog(" scep request pending, polling every %d seconds"
1025 , poll_interval);
1026 time(&poll_start);
1027 issuerAndSubject = asn1_wrap(ASN1_SEQUENCE, "cc"
1028 , x509_ca_sig->subject
1029 , subject);
1030 }
1031 while (attrs.pkiStatus == SCEP_PENDING)
1032 {
1033 if (max_poll_time > 0
1034 && (time(NULL) - poll_start >= max_poll_time))
1035 {
1036 exit_scepclient("maximum poll time reached: %d seconds"
1037 , max_poll_time);
1038 }
1039 DBG(DBG_CONTROL,
1040 DBG_log("going to sleep for %d seconds", poll_interval)
1041 )
1042 sleep(poll_interval);
1043 free(scep_response.ptr);
1044
1045 DBG(DBG_CONTROL,
1046 DBG_log("fingerprint: %.*s", (int)fingerprint.len, fingerprint.ptr);
1047 DBG_log("transaction ID: %.*s", (int)transID.len, transID.ptr)
1048 )
1049
1050 chunk_free(&getCertInitial);
1051 getCertInitial = scep_build_request(issuerAndSubject
1052 , transID, SCEP_GetCertInitial_MSG
1053 , x509_ca_enc, pkcs7_symmetric_cipher
1054 , x509_signer, pkcs7_digest_alg, private_key);
1055
1056 if (!scep_http_request(scep_url, getCertInitial, SCEP_PKI_OPERATION,
1057 http_get_request, &scep_response))
1058 {
1059 exit_scepclient("did not receive a valid scep response");
1060 }
1061 ugh = scep_parse_response(scep_response, transID, &data, &attrs
1062 , x509_ca_sig);
1063 if (ugh != NULL)
1064 {
1065 exit_scepclient(ugh);
1066 }
1067 }
1068
1069 if (attrs.pkiStatus != SCEP_SUCCESS)
1070 {
1071 exit_scepclient("reply status is not 'SUCCESS'");
1072 }
1073
1074 envelopedData = data.content;
1075
1076 if (data.type != OID_PKCS7_DATA
1077 || !asn1_parse_simple_object(&envelopedData, ASN1_OCTET_STRING, 0, "data"))
1078 {
1079 exit_scepclient("contentInfo is not of type 'data'");
1080 }
1081 if (!pkcs7_parse_envelopedData(envelopedData, &certData
1082 , serialNumber, private_key))
1083 {
1084 exit_scepclient("could not decrypt envelopedData");
1085 }
1086 if (!pkcs7_parse_signedData(certData, NULL, &certs, NULL, NULL))
1087 {
1088 exit_scepclient("error parsing the scep response");
1089 }
1090 chunk_free(&certData);
1091
1092 /* store the end entity certificate */
1093 path = concatenate_paths(HOST_CERT_PATH, file_out_cert);
1094 while (certs != NULL)
1095 {
1096 bool stored = FALSE;
1097 x509cert_t *cert = certs;
1098
1099 if (!cert->isCA)
1100 {
1101 if (stored)
1102 exit_scepclient("multiple certs received, only first stored");
1103 if (!chunk_write(cert->certificate, path, "requested cert", 0022, force))
1104 exit_scepclient("could not write cert file '%s'", path);
1105 stored = TRUE;
1106 }
1107 certs = certs->next;
1108 free_x509cert(cert);
1109 }
1110 filetype_out &= ~CERT; /* delete CERT flag */
1111 }
1112
1113 exit_scepclient(NULL);
1114 return -1; /* should never be reached */
1115 }
1116
1117