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- (dtucker) [configure.ac openbsd-compat/Makefile.in
[openssh-git.git] / ssh-keygen.c
blobd90b1dfdd389236cc762543481780bd037b6a4a0
1 /* $OpenBSD: ssh-keygen.c,v 1.197 2010/08/04 06:07:11 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * Identity and host key generation and maintenance.
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15 #include "includes.h"
16
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/stat.h>
20 #include <sys/param.h>
21
22 #include <openssl/evp.h>
23 #include <openssl/pem.h>
24 #include "openbsd-compat/openssl-compat.h"
25
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <netdb.h>
29 #ifdef HAVE_PATHS_H
30 # include <paths.h>
31 #endif
32 #include <pwd.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #include "xmalloc.h"
40 #include "key.h"
41 #include "rsa.h"
42 #include "authfile.h"
43 #include "uuencode.h"
44 #include "buffer.h"
45 #include "pathnames.h"
46 #include "log.h"
47 #include "misc.h"
48 #include "match.h"
49 #include "hostfile.h"
50 #include "dns.h"
51 #include "ssh2.h"
52
53 #ifdef ENABLE_PKCS11
54 #include "ssh-pkcs11.h"
55 #endif
56
57 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
58 #define DEFAULT_BITS 2048
59 #define DEFAULT_BITS_DSA 1024
60 u_int32_t bits = 0;
61
62 /*
63 * Flag indicating that we just want to change the passphrase. This can be
64 * set on the command line.
65 */
66 int change_passphrase = 0;
67
68 /*
69 * Flag indicating that we just want to change the comment. This can be set
70 * on the command line.
71 */
72 int change_comment = 0;
73
74 int quiet = 0;
75
76 int log_level = SYSLOG_LEVEL_INFO;
77
78 /* Flag indicating that we want to hash a known_hosts file */
79 int hash_hosts = 0;
80 /* Flag indicating that we want lookup a host in known_hosts file */
81 int find_host = 0;
82 /* Flag indicating that we want to delete a host from a known_hosts file */
83 int delete_host = 0;
84
85 /* Flag indicating that we want to show the contents of a certificate */
86 int show_cert = 0;
87
88 /* Flag indicating that we just want to see the key fingerprint */
89 int print_fingerprint = 0;
90 int print_bubblebabble = 0;
91
92 /* The identity file name, given on the command line or entered by the user. */
93 char identity_file[1024];
94 int have_identity = 0;
95
96 /* This is set to the passphrase if given on the command line. */
97 char *identity_passphrase = NULL;
98
99 /* This is set to the new passphrase if given on the command line. */
100 char *identity_new_passphrase = NULL;
101
102 /* This is set to the new comment if given on the command line. */
103 char *identity_comment = NULL;
104
105 /* Path to CA key when certifying keys. */
106 char *ca_key_path = NULL;
107
108 /* Certificate serial number */
109 long long cert_serial = 0;
110
111 /* Key type when certifying */
112 u_int cert_key_type = SSH2_CERT_TYPE_USER;
113
114 /* "key ID" of signed key */
115 char *cert_key_id = NULL;
116
117 /* Comma-separated list of principal names for certifying keys */
118 char *cert_principals = NULL;
119
120 /* Validity period for certificates */
121 u_int64_t cert_valid_from = 0;
122 u_int64_t cert_valid_to = ~0ULL;
123
124 /* Certificate options */
125 #define CERTOPT_X_FWD (1)
126 #define CERTOPT_AGENT_FWD (1<<1)
127 #define CERTOPT_PORT_FWD (1<<2)
128 #define CERTOPT_PTY (1<<3)
129 #define CERTOPT_USER_RC (1<<4)
130 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
131 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
132 u_int32_t certflags_flags = CERTOPT_DEFAULT;
133 char *certflags_command = NULL;
134 char *certflags_src_addr = NULL;
135
136 /* Conversion to/from various formats */
137 int convert_to = 0;
138 int convert_from = 0;
139 enum {
140 FMT_RFC4716,
141 FMT_PKCS8,
142 FMT_PEM
143 } convert_format = FMT_RFC4716;
144 int print_public = 0;
145 int print_generic = 0;
146
147 char *key_type_name = NULL;
148
149 /* Load key from this PKCS#11 provider */
150 char *pkcs11provider = NULL;
151
152 /* argv0 */
153 extern char *__progname;
154
155 char hostname[MAXHOSTNAMELEN];
156
157 /* moduli.c */
158 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
159 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
160
161 static void
162 ask_filename(struct passwd *pw, const char *prompt)
163 {
164 char buf[1024];
165 char *name = NULL;
166
167 if (key_type_name == NULL)
168 name = _PATH_SSH_CLIENT_ID_RSA;
169 else {
170 switch (key_type_from_name(key_type_name)) {
171 case KEY_RSA1:
172 name = _PATH_SSH_CLIENT_IDENTITY;
173 break;
174 case KEY_DSA_CERT:
175 case KEY_DSA_CERT_V00:
176 case KEY_DSA:
177 name = _PATH_SSH_CLIENT_ID_DSA;
178 break;
179 case KEY_RSA_CERT:
180 case KEY_RSA_CERT_V00:
181 case KEY_RSA:
182 name = _PATH_SSH_CLIENT_ID_RSA;
183 break;
184 default:
185 fprintf(stderr, "bad key type\n");
186 exit(1);
187 break;
188 }
189 }
190 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
191 fprintf(stderr, "%s (%s): ", prompt, identity_file);
192 if (fgets(buf, sizeof(buf), stdin) == NULL)
193 exit(1);
194 buf[strcspn(buf, "\n")] = '\0';
195 if (strcmp(buf, "") != 0)
196 strlcpy(identity_file, buf, sizeof(identity_file));
197 have_identity = 1;
198 }
199
200 static Key *
201 load_identity(char *filename)
202 {
203 char *pass;
204 Key *prv;
205
206 prv = key_load_private(filename, "", NULL);
207 if (prv == NULL) {
208 if (identity_passphrase)
209 pass = xstrdup(identity_passphrase);
210 else
211 pass = read_passphrase("Enter passphrase: ",
212 RP_ALLOW_STDIN);
213 prv = key_load_private(filename, pass, NULL);
214 memset(pass, 0, strlen(pass));
215 xfree(pass);
216 }
217 return prv;
218 }
219
220 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
221 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
222 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
223 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
224
225 static void
226 do_convert_to_ssh2(struct passwd *pw, Key *k)
227 {
228 u_int len;
229 u_char *blob;
230 char comment[61];
231
232 if (key_to_blob(k, &blob, &len) <= 0) {
233 fprintf(stderr, "key_to_blob failed\n");
234 exit(1);
235 }
236 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
237 snprintf(comment, sizeof(comment),
238 "%u-bit %s, converted by %s@%s from OpenSSH",
239 key_size(k), key_type(k),
240 pw->pw_name, hostname);
241
242 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
243 fprintf(stdout, "Comment: \"%s\"\n", comment);
244 dump_base64(stdout, blob, len);
245 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
246 key_free(k);
247 xfree(blob);
248 exit(0);
249 }
250
251 static void
252 do_convert_to_pkcs8(Key *k)
253 {
254 switch (key_type_plain(k->type)) {
255 case KEY_RSA:
256 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
257 fatal("PEM_write_RSA_PUBKEY failed");
258 break;
259 case KEY_DSA:
260 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
261 fatal("PEM_write_DSA_PUBKEY failed");
262 break;
263 default:
264 fatal("%s: unsupported key type %s", __func__, key_type(k));
265 }
266 exit(0);
267 }
268
269 static void
270 do_convert_to_pem(Key *k)
271 {
272 switch (key_type_plain(k->type)) {
273 case KEY_RSA:
274 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
275 fatal("PEM_write_RSAPublicKey failed");
276 break;
277 #if notyet /* OpenSSH 0.9.8 lacks this function */
278 case KEY_DSA:
279 if (!PEM_write_DSAPublicKey(stdout, k->dsa))
280 fatal("PEM_write_DSAPublicKey failed");
281 break;
282 #endif
283 default:
284 fatal("%s: unsupported key type %s", __func__, key_type(k));
285 }
286 exit(0);
287 }
288
289 static void
290 do_convert_to(struct passwd *pw)
291 {
292 Key *k;
293 struct stat st;
294
295 if (!have_identity)
296 ask_filename(pw, "Enter file in which the key is");
297 if (stat(identity_file, &st) < 0)
298 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
299 if ((k = key_load_public(identity_file, NULL)) == NULL) {
300 if ((k = load_identity(identity_file)) == NULL) {
301 fprintf(stderr, "load failed\n");
302 exit(1);
303 }
304 }
305 if (k->type == KEY_RSA1) {
306 fprintf(stderr, "version 1 keys are not supported\n");
307 exit(1);
308 }
309
310 switch (convert_format) {
311 case FMT_RFC4716:
312 do_convert_to_ssh2(pw, k);
313 break;
314 case FMT_PKCS8:
315 do_convert_to_pkcs8(k);
316 break;
317 case FMT_PEM:
318 do_convert_to_pem(k);
319 break;
320 default:
321 fatal("%s: unknown key format %d", __func__, convert_format);
322 }
323 exit(0);
324 }
325
326 static void
327 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
328 {
329 u_int bignum_bits = buffer_get_int(b);
330 u_int bytes = (bignum_bits + 7) / 8;
331
332 if (buffer_len(b) < bytes)
333 fatal("buffer_get_bignum_bits: input buffer too small: "
334 "need %d have %d", bytes, buffer_len(b));
335 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL)
336 fatal("buffer_get_bignum_bits: BN_bin2bn failed");
337 buffer_consume(b, bytes);
338 }
339
340 static Key *
341 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
342 {
343 Buffer b;
344 Key *key = NULL;
345 char *type, *cipher;
346 u_char *sig, data[] = "abcde12345";
347 int magic, rlen, ktype, i1, i2, i3, i4;
348 u_int slen;
349 u_long e;
350
351 buffer_init(&b);
352 buffer_append(&b, blob, blen);
353
354 magic = buffer_get_int(&b);
355 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
356 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
357 buffer_free(&b);
358 return NULL;
359 }
360 i1 = buffer_get_int(&b);
361 type = buffer_get_string(&b, NULL);
362 cipher = buffer_get_string(&b, NULL);
363 i2 = buffer_get_int(&b);
364 i3 = buffer_get_int(&b);
365 i4 = buffer_get_int(&b);
366 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
367 if (strcmp(cipher, "none") != 0) {
368 error("unsupported cipher %s", cipher);
369 xfree(cipher);
370 buffer_free(&b);
371 xfree(type);
372 return NULL;
373 }
374 xfree(cipher);
375
376 if (strstr(type, "dsa")) {
377 ktype = KEY_DSA;
378 } else if (strstr(type, "rsa")) {
379 ktype = KEY_RSA;
380 } else {
381 buffer_free(&b);
382 xfree(type);
383 return NULL;
384 }
385 key = key_new_private(ktype);
386 xfree(type);
387
388 switch (key->type) {
389 case KEY_DSA:
390 buffer_get_bignum_bits(&b, key->dsa->p);
391 buffer_get_bignum_bits(&b, key->dsa->g);
392 buffer_get_bignum_bits(&b, key->dsa->q);
393 buffer_get_bignum_bits(&b, key->dsa->pub_key);
394 buffer_get_bignum_bits(&b, key->dsa->priv_key);
395 break;
396 case KEY_RSA:
397 e = buffer_get_char(&b);
398 debug("e %lx", e);
399 if (e < 30) {
400 e <<= 8;
401 e += buffer_get_char(&b);
402 debug("e %lx", e);
403 e <<= 8;
404 e += buffer_get_char(&b);
405 debug("e %lx", e);
406 }
407 if (!BN_set_word(key->rsa->e, e)) {
408 buffer_free(&b);
409 key_free(key);
410 return NULL;
411 }
412 buffer_get_bignum_bits(&b, key->rsa->d);
413 buffer_get_bignum_bits(&b, key->rsa->n);
414 buffer_get_bignum_bits(&b, key->rsa->iqmp);
415 buffer_get_bignum_bits(&b, key->rsa->q);
416 buffer_get_bignum_bits(&b, key->rsa->p);
417 rsa_generate_additional_parameters(key->rsa);
418 break;
419 }
420 rlen = buffer_len(&b);
421 if (rlen != 0)
422 error("do_convert_private_ssh2_from_blob: "
423 "remaining bytes in key blob %d", rlen);
424 buffer_free(&b);
425
426 /* try the key */
427 key_sign(key, &sig, &slen, data, sizeof(data));
428 key_verify(key, sig, slen, data, sizeof(data));
429 xfree(sig);
430 return key;
431 }
432
433 static int
434 get_line(FILE *fp, char *line, size_t len)
435 {
436 int c;
437 size_t pos = 0;
438
439 line[0] = '\0';
440 while ((c = fgetc(fp)) != EOF) {
441 if (pos >= len - 1) {
442 fprintf(stderr, "input line too long.\n");
443 exit(1);
444 }
445 switch (c) {
446 case '\r':
447 c = fgetc(fp);
448 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
449 fprintf(stderr, "unget: %s\n", strerror(errno));
450 exit(1);
451 }
452 return pos;
453 case '\n':
454 return pos;
455 }
456 line[pos++] = c;
457 line[pos] = '\0';
458 }
459 /* We reached EOF */
460 return -1;
461 }
462
463 static void
464 do_convert_from_ssh2(struct passwd *pw, Key **k, int *private)
465 {
466 int blen;
467 u_int len;
468 char line[1024];
469 u_char blob[8096];
470 char encoded[8096];
471 int escaped = 0;
472 FILE *fp;
473
474 if ((fp = fopen(identity_file, "r")) == NULL)
475 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
476 encoded[0] = '\0';
477 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
478 if (line[blen - 1] == '\\')
479 escaped++;
480 if (strncmp(line, "----", 4) == 0 ||
481 strstr(line, ": ") != NULL) {
482 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
483 *private = 1;
484 if (strstr(line, " END ") != NULL) {
485 break;
486 }
487 /* fprintf(stderr, "ignore: %s", line); */
488 continue;
489 }
490 if (escaped) {
491 escaped--;
492 /* fprintf(stderr, "escaped: %s", line); */
493 continue;
494 }
495 strlcat(encoded, line, sizeof(encoded));
496 }
497 len = strlen(encoded);
498 if (((len % 4) == 3) &&
499 (encoded[len-1] == '=') &&
500 (encoded[len-2] == '=') &&
501 (encoded[len-3] == '='))
502 encoded[len-3] = '\0';
503 blen = uudecode(encoded, blob, sizeof(blob));
504 if (blen < 0) {
505 fprintf(stderr, "uudecode failed.\n");
506 exit(1);
507 }
508 *k = *private ?
509 do_convert_private_ssh2_from_blob(blob, blen) :
510 key_from_blob(blob, blen);
511 if (*k == NULL) {
512 fprintf(stderr, "decode blob failed.\n");
513 exit(1);
514 }
515 fclose(fp);
516 }
517
518 static void
519 do_convert_from_pkcs8(Key **k, int *private)
520 {
521 EVP_PKEY *pubkey;
522 FILE *fp;
523
524 if ((fp = fopen(identity_file, "r")) == NULL)
525 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
526 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
527 fatal("%s: %s is not a recognised public key format", __func__,
528 identity_file);
529 }
530 fclose(fp);
531 switch (EVP_PKEY_type(pubkey->type)) {
532 case EVP_PKEY_RSA:
533 *k = key_new(KEY_UNSPEC);
534 (*k)->type = KEY_RSA;
535 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
536 break;
537 case EVP_PKEY_DSA:
538 *k = key_new(KEY_UNSPEC);
539 (*k)->type = KEY_DSA;
540 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
541 break;
542 default:
543 fatal("%s: unsupported pubkey type %d", __func__,
544 EVP_PKEY_type(pubkey->type));
545 }
546 EVP_PKEY_free(pubkey);
547 return;
548 }
549
550 static void
551 do_convert_from_pem(Key **k, int *private)
552 {
553 FILE *fp;
554 RSA *rsa;
555 #ifdef notyet
556 DSA *dsa;
557 #endif
558
559 if ((fp = fopen(identity_file, "r")) == NULL)
560 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
561 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
562 *k = key_new(KEY_UNSPEC);
563 (*k)->type = KEY_RSA;
564 (*k)->rsa = rsa;
565 fclose(fp);
566 return;
567 }
568 #if notyet /* OpenSSH 0.9.8 lacks this function */
569 rewind(fp);
570 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
571 *k = key_new(KEY_UNSPEC);
572 (*k)->type = KEY_DSA;
573 (*k)->dsa = dsa;
574 fclose(fp);
575 return;
576 }
577 #endif
578 fatal("%s: unrecognised raw private key format", __func__);
579 }
580
581 static void
582 do_convert_from(struct passwd *pw)
583 {
584 Key *k = NULL;
585 int private = 0, ok = 0;
586 struct stat st;
587
588 if (!have_identity)
589 ask_filename(pw, "Enter file in which the key is");
590 if (stat(identity_file, &st) < 0)
591 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
592
593 switch (convert_format) {
594 case FMT_RFC4716:
595 do_convert_from_ssh2(pw, &k, &private);
596 break;
597 case FMT_PKCS8:
598 do_convert_from_pkcs8(&k, &private);
599 break;
600 case FMT_PEM:
601 do_convert_from_pem(&k, &private);
602 break;
603 default:
604 fatal("%s: unknown key format %d", __func__, convert_format);
605 }
606
607 if (!private)
608 ok = key_write(k, stdout);
609 if (ok)
610 fprintf(stdout, "\n");
611 else {
612 switch (k->type) {
613 case KEY_DSA:
614 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
615 NULL, 0, NULL, NULL);
616 break;
617 case KEY_RSA:
618 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
619 NULL, 0, NULL, NULL);
620 break;
621 default:
622 fatal("%s: unsupported key type %s", __func__,
623 key_type(k));
624 }
625 }
626
627 if (!ok) {
628 fprintf(stderr, "key write failed\n");
629 exit(1);
630 }
631 key_free(k);
632 exit(0);
633 }
634
635 static void
636 do_print_public(struct passwd *pw)
637 {
638 Key *prv;
639 struct stat st;
640
641 if (!have_identity)
642 ask_filename(pw, "Enter file in which the key is");
643 if (stat(identity_file, &st) < 0) {
644 perror(identity_file);
645 exit(1);
646 }
647 prv = load_identity(identity_file);
648 if (prv == NULL) {
649 fprintf(stderr, "load failed\n");
650 exit(1);
651 }
652 if (!key_write(prv, stdout))
653 fprintf(stderr, "key_write failed");
654 key_free(prv);
655 fprintf(stdout, "\n");
656 exit(0);
657 }
658
659 static void
660 do_download(struct passwd *pw)
661 {
662 #ifdef ENABLE_PKCS11
663 Key **keys = NULL;
664 int i, nkeys;
665
666 pkcs11_init(0);
667 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys);
668 if (nkeys <= 0)
669 fatal("cannot read public key from pkcs11");
670 for (i = 0; i < nkeys; i++) {
671 key_write(keys[i], stdout);
672 key_free(keys[i]);
673 fprintf(stdout, "\n");
674 }
675 xfree(keys);
676 pkcs11_terminate();
677 exit(0);
678 #else
679 fatal("no pkcs11 support");
680 #endif /* ENABLE_PKCS11 */
681 }
682
683 static void
684 do_fingerprint(struct passwd *pw)
685 {
686 FILE *f;
687 Key *public;
688 char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra;
689 int i, skip = 0, num = 0, invalid = 1;
690 enum fp_rep rep;
691 enum fp_type fptype;
692 struct stat st;
693
694 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
695 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
696
697 if (!have_identity)
698 ask_filename(pw, "Enter file in which the key is");
699 if (stat(identity_file, &st) < 0) {
700 perror(identity_file);
701 exit(1);
702 }
703 public = key_load_public(identity_file, &comment);
704 if (public != NULL) {
705 fp = key_fingerprint(public, fptype, rep);
706 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
707 printf("%u %s %s (%s)\n", key_size(public), fp, comment,
708 key_type(public));
709 if (log_level >= SYSLOG_LEVEL_VERBOSE)
710 printf("%s\n", ra);
711 key_free(public);
712 xfree(comment);
713 xfree(ra);
714 xfree(fp);
715 exit(0);
716 }
717 if (comment) {
718 xfree(comment);
719 comment = NULL;
720 }
721
722 if ((f = fopen(identity_file, "r")) == NULL)
723 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
724
725 while (fgets(line, sizeof(line), f)) {
726 if ((cp = strchr(line, '\n')) == NULL) {
727 error("line %d too long: %.40s...",
728 num + 1, line);
729 skip = 1;
730 continue;
731 }
732 num++;
733 if (skip) {
734 skip = 0;
735 continue;
736 }
737 *cp = '\0';
738
739 /* Skip leading whitespace, empty and comment lines. */
740 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
741 ;
742 if (!*cp || *cp == '\n' || *cp == '#')
743 continue;
744 i = strtol(cp, &ep, 10);
745 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
746 int quoted = 0;
747 comment = cp;
748 for (; *cp && (quoted || (*cp != ' ' &&
749 *cp != '\t')); cp++) {
750 if (*cp == '\\' && cp[1] == '"')
751 cp++; /* Skip both */
752 else if (*cp == '"')
753 quoted = !quoted;
754 }
755 if (!*cp)
756 continue;
757 *cp++ = '\0';
758 }
759 ep = cp;
760 public = key_new(KEY_RSA1);
761 if (key_read(public, &cp) != 1) {
762 cp = ep;
763 key_free(public);
764 public = key_new(KEY_UNSPEC);
765 if (key_read(public, &cp) != 1) {
766 key_free(public);
767 continue;
768 }
769 }
770 comment = *cp ? cp : comment;
771 fp = key_fingerprint(public, fptype, rep);
772 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
773 printf("%u %s %s (%s)\n", key_size(public), fp,
774 comment ? comment : "no comment", key_type(public));
775 if (log_level >= SYSLOG_LEVEL_VERBOSE)
776 printf("%s\n", ra);
777 xfree(ra);
778 xfree(fp);
779 key_free(public);
780 invalid = 0;
781 }
782 fclose(f);
783
784 if (invalid) {
785 printf("%s is not a public key file.\n", identity_file);
786 exit(1);
787 }
788 exit(0);
789 }
790
791 static void
792 printhost(FILE *f, const char *name, Key *public, int ca, int hash)
793 {
794 if (print_fingerprint) {
795 enum fp_rep rep;
796 enum fp_type fptype;
797 char *fp, *ra;
798
799 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
800 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
801 fp = key_fingerprint(public, fptype, rep);
802 ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART);
803 printf("%u %s %s (%s)\n", key_size(public), fp, name,
804 key_type(public));
805 if (log_level >= SYSLOG_LEVEL_VERBOSE)
806 printf("%s\n", ra);
807 xfree(ra);
808 xfree(fp);
809 } else {
810 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
811 fatal("hash_host failed");
812 fprintf(f, "%s%s%s ", ca ? CA_MARKER : "", ca ? " " : "", name);
813 if (!key_write(public, f))
814 fatal("key_write failed");
815 fprintf(f, "\n");
816 }
817 }
818
819 static void
820 do_known_hosts(struct passwd *pw, const char *name)
821 {
822 FILE *in, *out = stdout;
823 Key *pub;
824 char *cp, *cp2, *kp, *kp2;
825 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
826 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
827 int ca;
828
829 if (!have_identity) {
830 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
831 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
832 sizeof(identity_file))
833 fatal("Specified known hosts path too long");
834 xfree(cp);
835 have_identity = 1;
836 }
837 if ((in = fopen(identity_file, "r")) == NULL)
838 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
839
840 /*
841 * Find hosts goes to stdout, hash and deletions happen in-place
842 * A corner case is ssh-keygen -HF foo, which should go to stdout
843 */
844 if (!find_host && (hash_hosts || delete_host)) {
845 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
846 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
847 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
848 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
849 fatal("known_hosts path too long");
850 umask(077);
851 if ((c = mkstemp(tmp)) == -1)
852 fatal("mkstemp: %s", strerror(errno));
853 if ((out = fdopen(c, "w")) == NULL) {
854 c = errno;
855 unlink(tmp);
856 fatal("fdopen: %s", strerror(c));
857 }
858 inplace = 1;
859 }
860
861 while (fgets(line, sizeof(line), in)) {
862 if ((cp = strchr(line, '\n')) == NULL) {
863 error("line %d too long: %.40s...", num + 1, line);
864 skip = 1;
865 invalid = 1;
866 continue;
867 }
868 num++;
869 if (skip) {
870 skip = 0;
871 continue;
872 }
873 *cp = '\0';
874
875 /* Skip leading whitespace, empty and comment lines. */
876 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
877 ;
878 if (!*cp || *cp == '\n' || *cp == '#') {
879 if (inplace)
880 fprintf(out, "%s\n", cp);
881 continue;
882 }
883 /* Check whether this is a CA key */
884 if (strncasecmp(cp, CA_MARKER, sizeof(CA_MARKER) - 1) == 0 &&
885 (cp[sizeof(CA_MARKER) - 1] == ' ' ||
886 cp[sizeof(CA_MARKER) - 1] == '\t')) {
887 ca = 1;
888 cp += sizeof(CA_MARKER);
889 } else
890 ca = 0;
891
892 /* Find the end of the host name portion. */
893 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
894 ;
895
896 if (*kp == '\0' || *(kp + 1) == '\0') {
897 error("line %d missing key: %.40s...",
898 num, line);
899 invalid = 1;
900 continue;
901 }
902 *kp++ = '\0';
903 kp2 = kp;
904
905 pub = key_new(KEY_RSA1);
906 if (key_read(pub, &kp) != 1) {
907 kp = kp2;
908 key_free(pub);
909 pub = key_new(KEY_UNSPEC);
910 if (key_read(pub, &kp) != 1) {
911 error("line %d invalid key: %.40s...",
912 num, line);
913 key_free(pub);
914 invalid = 1;
915 continue;
916 }
917 }
918
919 if (*cp == HASH_DELIM) {
920 if (find_host || delete_host) {
921 cp2 = host_hash(name, cp, strlen(cp));
922 if (cp2 == NULL) {
923 error("line %d: invalid hashed "
924 "name: %.64s...", num, line);
925 invalid = 1;
926 continue;
927 }
928 c = (strcmp(cp2, cp) == 0);
929 if (find_host && c) {
930 printf("# Host %s found: "
931 "line %d type %s%s\n", name,
932 num, key_type(pub),
933 ca ? " (CA key)" : "");
934 printhost(out, cp, pub, ca, 0);
935 }
936 if (delete_host && !c && !ca)
937 printhost(out, cp, pub, ca, 0);
938 } else if (hash_hosts)
939 printhost(out, cp, pub, ca, 0);
940 } else {
941 if (find_host || delete_host) {
942 c = (match_hostname(name, cp,
943 strlen(cp)) == 1);
944 if (find_host && c) {
945 printf("# Host %s found: "
946 "line %d type %s%s\n", name,
947 num, key_type(pub),
948 ca ? " (CA key)" : "");
949 printhost(out, name, pub,
950 ca, hash_hosts && !ca);
951 }
952 if (delete_host && !c && !ca)
953 printhost(out, cp, pub, ca, 0);
954 } else if (hash_hosts) {
955 for (cp2 = strsep(&cp, ",");
956 cp2 != NULL && *cp2 != '\0';
957 cp2 = strsep(&cp, ",")) {
958 if (ca) {
959 fprintf(stderr, "Warning: "
960 "ignoring CA key for host: "
961 "%.64s\n", cp2);
962 printhost(out, cp2, pub, ca, 0);
963 } else if (strcspn(cp2, "*?!") !=
964 strlen(cp2)) {
965 fprintf(stderr, "Warning: "
966 "ignoring host name with "
967 "metacharacters: %.64s\n",
968 cp2);
969 printhost(out, cp2, pub, ca, 0);
970 } else
971 printhost(out, cp2, pub, ca, 1);
972 }
973 has_unhashed = 1;
974 }
975 }
976 key_free(pub);
977 }
978 fclose(in);
979
980 if (invalid) {
981 fprintf(stderr, "%s is not a valid known_hosts file.\n",
982 identity_file);
983 if (inplace) {
984 fprintf(stderr, "Not replacing existing known_hosts "
985 "file because of errors\n");
986 fclose(out);
987 unlink(tmp);
988 }
989 exit(1);
990 }
991
992 if (inplace) {
993 fclose(out);
994
995 /* Backup existing file */
996 if (unlink(old) == -1 && errno != ENOENT)
997 fatal("unlink %.100s: %s", old, strerror(errno));
998 if (link(identity_file, old) == -1)
999 fatal("link %.100s to %.100s: %s", identity_file, old,
1000 strerror(errno));
1001 /* Move new one into place */
1002 if (rename(tmp, identity_file) == -1) {
1003 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1004 strerror(errno));
1005 unlink(tmp);
1006 unlink(old);
1007 exit(1);
1008 }
1009
1010 fprintf(stderr, "%s updated.\n", identity_file);
1011 fprintf(stderr, "Original contents retained as %s\n", old);
1012 if (has_unhashed) {
1013 fprintf(stderr, "WARNING: %s contains unhashed "
1014 "entries\n", old);
1015 fprintf(stderr, "Delete this file to ensure privacy "
1016 "of hostnames\n");
1017 }
1018 }
1019
1020 exit(0);
1021 }
1022
1023 /*
1024 * Perform changing a passphrase. The argument is the passwd structure
1025 * for the current user.
1026 */
1027 static void
1028 do_change_passphrase(struct passwd *pw)
1029 {
1030 char *comment;
1031 char *old_passphrase, *passphrase1, *passphrase2;
1032 struct stat st;
1033 Key *private;
1034
1035 if (!have_identity)
1036 ask_filename(pw, "Enter file in which the key is");
1037 if (stat(identity_file, &st) < 0) {
1038 perror(identity_file);
1039 exit(1);
1040 }
1041 /* Try to load the file with empty passphrase. */
1042 private = key_load_private(identity_file, "", &comment);
1043 if (private == NULL) {
1044 if (identity_passphrase)
1045 old_passphrase = xstrdup(identity_passphrase);
1046 else
1047 old_passphrase =
1048 read_passphrase("Enter old passphrase: ",
1049 RP_ALLOW_STDIN);
1050 private = key_load_private(identity_file, old_passphrase,
1051 &comment);
1052 memset(old_passphrase, 0, strlen(old_passphrase));
1053 xfree(old_passphrase);
1054 if (private == NULL) {
1055 printf("Bad passphrase.\n");
1056 exit(1);
1057 }
1058 }
1059 printf("Key has comment '%s'\n", comment);
1060
1061 /* Ask the new passphrase (twice). */
1062 if (identity_new_passphrase) {
1063 passphrase1 = xstrdup(identity_new_passphrase);
1064 passphrase2 = NULL;
1065 } else {
1066 passphrase1 =
1067 read_passphrase("Enter new passphrase (empty for no "
1068 "passphrase): ", RP_ALLOW_STDIN);
1069 passphrase2 = read_passphrase("Enter same passphrase again: ",
1070 RP_ALLOW_STDIN);
1071
1072 /* Verify that they are the same. */
1073 if (strcmp(passphrase1, passphrase2) != 0) {
1074 memset(passphrase1, 0, strlen(passphrase1));
1075 memset(passphrase2, 0, strlen(passphrase2));
1076 xfree(passphrase1);
1077 xfree(passphrase2);
1078 printf("Pass phrases do not match. Try again.\n");
1079 exit(1);
1080 }
1081 /* Destroy the other copy. */
1082 memset(passphrase2, 0, strlen(passphrase2));
1083 xfree(passphrase2);
1084 }
1085
1086 /* Save the file using the new passphrase. */
1087 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1088 printf("Saving the key failed: %s.\n", identity_file);
1089 memset(passphrase1, 0, strlen(passphrase1));
1090 xfree(passphrase1);
1091 key_free(private);
1092 xfree(comment);
1093 exit(1);
1094 }
1095 /* Destroy the passphrase and the copy of the key in memory. */
1096 memset(passphrase1, 0, strlen(passphrase1));
1097 xfree(passphrase1);
1098 key_free(private); /* Destroys contents */
1099 xfree(comment);
1100
1101 printf("Your identification has been saved with the new passphrase.\n");
1102 exit(0);
1103 }
1104
1105 /*
1106 * Print the SSHFP RR.
1107 */
1108 static int
1109 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
1110 {
1111 Key *public;
1112 char *comment = NULL;
1113 struct stat st;
1114
1115 if (fname == NULL)
1116 ask_filename(pw, "Enter file in which the key is");
1117 if (stat(fname, &st) < 0) {
1118 if (errno == ENOENT)
1119 return 0;
1120 perror(fname);
1121 exit(1);
1122 }
1123 public = key_load_public(fname, &comment);
1124 if (public != NULL) {
1125 export_dns_rr(hname, public, stdout, print_generic);
1126 key_free(public);
1127 xfree(comment);
1128 return 1;
1129 }
1130 if (comment)
1131 xfree(comment);
1132
1133 printf("failed to read v2 public key from %s.\n", fname);
1134 exit(1);
1135 }
1136
1137 /*
1138 * Change the comment of a private key file.
1139 */
1140 static void
1141 do_change_comment(struct passwd *pw)
1142 {
1143 char new_comment[1024], *comment, *passphrase;
1144 Key *private;
1145 Key *public;
1146 struct stat st;
1147 FILE *f;
1148 int fd;
1149
1150 if (!have_identity)
1151 ask_filename(pw, "Enter file in which the key is");
1152 if (stat(identity_file, &st) < 0) {
1153 perror(identity_file);
1154 exit(1);
1155 }
1156 private = key_load_private(identity_file, "", &comment);
1157 if (private == NULL) {
1158 if (identity_passphrase)
1159 passphrase = xstrdup(identity_passphrase);
1160 else if (identity_new_passphrase)
1161 passphrase = xstrdup(identity_new_passphrase);
1162 else
1163 passphrase = read_passphrase("Enter passphrase: ",
1164 RP_ALLOW_STDIN);
1165 /* Try to load using the passphrase. */
1166 private = key_load_private(identity_file, passphrase, &comment);
1167 if (private == NULL) {
1168 memset(passphrase, 0, strlen(passphrase));
1169 xfree(passphrase);
1170 printf("Bad passphrase.\n");
1171 exit(1);
1172 }
1173 } else {
1174 passphrase = xstrdup("");
1175 }
1176 if (private->type != KEY_RSA1) {
1177 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
1178 key_free(private);
1179 exit(1);
1180 }
1181 printf("Key now has comment '%s'\n", comment);
1182
1183 if (identity_comment) {
1184 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1185 } else {
1186 printf("Enter new comment: ");
1187 fflush(stdout);
1188 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1189 memset(passphrase, 0, strlen(passphrase));
1190 key_free(private);
1191 exit(1);
1192 }
1193 new_comment[strcspn(new_comment, "\n")] = '\0';
1194 }
1195
1196 /* Save the file using the new passphrase. */
1197 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
1198 printf("Saving the key failed: %s.\n", identity_file);
1199 memset(passphrase, 0, strlen(passphrase));
1200 xfree(passphrase);
1201 key_free(private);
1202 xfree(comment);
1203 exit(1);
1204 }
1205 memset(passphrase, 0, strlen(passphrase));
1206 xfree(passphrase);
1207 public = key_from_private(private);
1208 key_free(private);
1209
1210 strlcat(identity_file, ".pub", sizeof(identity_file));
1211 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1212 if (fd == -1) {
1213 printf("Could not save your public key in %s\n", identity_file);
1214 exit(1);
1215 }
1216 f = fdopen(fd, "w");
1217 if (f == NULL) {
1218 printf("fdopen %s failed\n", identity_file);
1219 exit(1);
1220 }
1221 if (!key_write(public, f))
1222 fprintf(stderr, "write key failed\n");
1223 key_free(public);
1224 fprintf(f, " %s\n", new_comment);
1225 fclose(f);
1226
1227 xfree(comment);
1228
1229 printf("The comment in your key file has been changed.\n");
1230 exit(0);
1231 }
1232
1233 static const char *
1234 fmt_validity(u_int64_t valid_from, u_int64_t valid_to)
1235 {
1236 char from[32], to[32];
1237 static char ret[64];
1238 time_t tt;
1239 struct tm *tm;
1240
1241 *from = *to = '\0';
1242 if (valid_from == 0 && valid_to == 0xffffffffffffffffULL)
1243 return "forever";
1244
1245 if (valid_from != 0) {
1246 /* XXX revisit INT_MAX in 2038 :) */
1247 tt = valid_from > INT_MAX ? INT_MAX : valid_from;
1248 tm = localtime(&tt);
1249 strftime(from, sizeof(from), "%Y-%m-%dT%H:%M:%S", tm);
1250 }
1251 if (valid_to != 0xffffffffffffffffULL) {
1252 /* XXX revisit INT_MAX in 2038 :) */
1253 tt = valid_to > INT_MAX ? INT_MAX : valid_to;
1254 tm = localtime(&tt);
1255 strftime(to, sizeof(to), "%Y-%m-%dT%H:%M:%S", tm);
1256 }
1257
1258 if (valid_from == 0) {
1259 snprintf(ret, sizeof(ret), "before %s", to);
1260 return ret;
1261 }
1262 if (valid_to == 0xffffffffffffffffULL) {
1263 snprintf(ret, sizeof(ret), "after %s", from);
1264 return ret;
1265 }
1266
1267 snprintf(ret, sizeof(ret), "from %s to %s", from, to);
1268 return ret;
1269 }
1270
1271 static void
1272 add_flag_option(Buffer *c, const char *name)
1273 {
1274 debug3("%s: %s", __func__, name);
1275 buffer_put_cstring(c, name);
1276 buffer_put_string(c, NULL, 0);
1277 }
1278
1279 static void
1280 add_string_option(Buffer *c, const char *name, const char *value)
1281 {
1282 Buffer b;
1283
1284 debug3("%s: %s=%s", __func__, name, value);
1285 buffer_init(&b);
1286 buffer_put_cstring(&b, value);
1287
1288 buffer_put_cstring(c, name);
1289 buffer_put_string(c, buffer_ptr(&b), buffer_len(&b));
1290
1291 buffer_free(&b);
1292 }
1293
1294 #define OPTIONS_CRITICAL 1
1295 #define OPTIONS_EXTENSIONS 2
1296 static void
1297 prepare_options_buf(Buffer *c, int which)
1298 {
1299 buffer_clear(c);
1300 if ((which & OPTIONS_CRITICAL) != 0 &&
1301 certflags_command != NULL)
1302 add_string_option(c, "force-command", certflags_command);
1303 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1304 (certflags_flags & CERTOPT_AGENT_FWD) != 0)
1305 add_flag_option(c, "permit-agent-forwarding");
1306 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1307 (certflags_flags & CERTOPT_PORT_FWD) != 0)
1308 add_flag_option(c, "permit-port-forwarding");
1309 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1310 (certflags_flags & CERTOPT_PTY) != 0)
1311 add_flag_option(c, "permit-pty");
1312 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1313 (certflags_flags & CERTOPT_USER_RC) != 0)
1314 add_flag_option(c, "permit-user-rc");
1315 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1316 (certflags_flags & CERTOPT_X_FWD) != 0)
1317 add_flag_option(c, "permit-X11-forwarding");
1318 if ((which & OPTIONS_CRITICAL) != 0 &&
1319 certflags_src_addr != NULL)
1320 add_string_option(c, "source-address", certflags_src_addr);
1321 }
1322
1323 static Key *
1324 load_pkcs11_key(char *path)
1325 {
1326 #ifdef ENABLE_PKCS11
1327 Key **keys = NULL, *public, *private = NULL;
1328 int i, nkeys;
1329
1330 if ((public = key_load_public(path, NULL)) == NULL)
1331 fatal("Couldn't load CA public key \"%s\"", path);
1332
1333 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys);
1334 debug3("%s: %d keys", __func__, nkeys);
1335 if (nkeys <= 0)
1336 fatal("cannot read public key from pkcs11");
1337 for (i = 0; i < nkeys; i++) {
1338 if (key_equal_public(public, keys[i])) {
1339 private = keys[i];
1340 continue;
1341 }
1342 key_free(keys[i]);
1343 }
1344 xfree(keys);
1345 key_free(public);
1346 return private;
1347 #else
1348 fatal("no pkcs11 support");
1349 #endif /* ENABLE_PKCS11 */
1350 }
1351
1352 static void
1353 do_ca_sign(struct passwd *pw, int argc, char **argv)
1354 {
1355 int i, fd;
1356 u_int n;
1357 Key *ca, *public;
1358 char *otmp, *tmp, *cp, *out, *comment, **plist = NULL;
1359 FILE *f;
1360 int v00 = 0; /* legacy keys */
1361
1362 if (key_type_name != NULL) {
1363 switch (key_type_from_name(key_type_name)) {
1364 case KEY_RSA_CERT_V00:
1365 case KEY_DSA_CERT_V00:
1366 v00 = 1;
1367 break;
1368 case KEY_UNSPEC:
1369 if (strcasecmp(key_type_name, "v00") == 0) {
1370 v00 = 1;
1371 break;
1372 } else if (strcasecmp(key_type_name, "v01") == 0)
1373 break;
1374 /* FALLTHROUGH */
1375 default:
1376 fprintf(stderr, "unknown key type %s\n", key_type_name);
1377 exit(1);
1378 }
1379 }
1380
1381 pkcs11_init(1);
1382 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1383 if (pkcs11provider != NULL) {
1384 if ((ca = load_pkcs11_key(tmp)) == NULL)
1385 fatal("No PKCS#11 key matching %s found", ca_key_path);
1386 } else if ((ca = load_identity(tmp)) == NULL)
1387 fatal("Couldn't load CA key \"%s\"", tmp);
1388 xfree(tmp);
1389
1390 for (i = 0; i < argc; i++) {
1391 /* Split list of principals */
1392 n = 0;
1393 if (cert_principals != NULL) {
1394 otmp = tmp = xstrdup(cert_principals);
1395 plist = NULL;
1396 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1397 plist = xrealloc(plist, n + 1, sizeof(*plist));
1398 if (*(plist[n] = xstrdup(cp)) == '\0')
1399 fatal("Empty principal name");
1400 }
1401 xfree(otmp);
1402 }
1403
1404 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1405 if ((public = key_load_public(tmp, &comment)) == NULL)
1406 fatal("%s: unable to open \"%s\"", __func__, tmp);
1407 if (public->type != KEY_RSA && public->type != KEY_DSA)
1408 fatal("%s: key \"%s\" type %s cannot be certified",
1409 __func__, tmp, key_type(public));
1410
1411 /* Prepare certificate to sign */
1412 if (key_to_certified(public, v00) != 0)
1413 fatal("Could not upgrade key %s to certificate", tmp);
1414 public->cert->type = cert_key_type;
1415 public->cert->serial = (u_int64_t)cert_serial;
1416 public->cert->key_id = xstrdup(cert_key_id);
1417 public->cert->nprincipals = n;
1418 public->cert->principals = plist;
1419 public->cert->valid_after = cert_valid_from;
1420 public->cert->valid_before = cert_valid_to;
1421 if (v00) {
1422 prepare_options_buf(&public->cert->critical,
1423 OPTIONS_CRITICAL|OPTIONS_EXTENSIONS);
1424 } else {
1425 prepare_options_buf(&public->cert->critical,
1426 OPTIONS_CRITICAL);
1427 prepare_options_buf(&public->cert->extensions,
1428 OPTIONS_EXTENSIONS);
1429 }
1430 public->cert->signature_key = key_from_private(ca);
1431
1432 if (key_certify(public, ca) != 0)
1433 fatal("Couldn't not certify key %s", tmp);
1434
1435 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1436 *cp = '\0';
1437 xasprintf(&out, "%s-cert.pub", tmp);
1438 xfree(tmp);
1439
1440 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
1441 fatal("Could not open \"%s\" for writing: %s", out,
1442 strerror(errno));
1443 if ((f = fdopen(fd, "w")) == NULL)
1444 fatal("%s: fdopen: %s", __func__, strerror(errno));
1445 if (!key_write(public, f))
1446 fatal("Could not write certified key to %s", out);
1447 fprintf(f, " %s\n", comment);
1448 fclose(f);
1449
1450 if (!quiet) {
1451 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1452 "valid %s", key_cert_type(public),
1453 out, public->cert->key_id, public->cert->serial,
1454 cert_principals != NULL ? " for " : "",
1455 cert_principals != NULL ? cert_principals : "",
1456 fmt_validity(cert_valid_from, cert_valid_to));
1457 }
1458
1459 key_free(public);
1460 xfree(out);
1461 }
1462 pkcs11_terminate();
1463 exit(0);
1464 }
1465
1466 static u_int64_t
1467 parse_relative_time(const char *s, time_t now)
1468 {
1469 int64_t mul, secs;
1470
1471 mul = *s == '-' ? -1 : 1;
1472
1473 if ((secs = convtime(s + 1)) == -1)
1474 fatal("Invalid relative certificate time %s", s);
1475 if (mul == -1 && secs > now)
1476 fatal("Certificate time %s cannot be represented", s);
1477 return now + (u_int64_t)(secs * mul);
1478 }
1479
1480 static u_int64_t
1481 parse_absolute_time(const char *s)
1482 {
1483 struct tm tm;
1484 time_t tt;
1485 char buf[32], *fmt;
1486
1487 /*
1488 * POSIX strptime says "The application shall ensure that there
1489 * is white-space or other non-alphanumeric characters between
1490 * any two conversion specifications" so arrange things this way.
1491 */
1492 switch (strlen(s)) {
1493 case 8:
1494 fmt = "%Y-%m-%d";
1495 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
1496 break;
1497 case 14:
1498 fmt = "%Y-%m-%dT%H:%M:%S";
1499 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
1500 s, s + 4, s + 6, s + 8, s + 10, s + 12);
1501 break;
1502 default:
1503 fatal("Invalid certificate time format %s", s);
1504 }
1505
1506 bzero(&tm, sizeof(tm));
1507 if (strptime(buf, fmt, &tm) == NULL)
1508 fatal("Invalid certificate time %s", s);
1509 if ((tt = mktime(&tm)) < 0)
1510 fatal("Certificate time %s cannot be represented", s);
1511 return (u_int64_t)tt;
1512 }
1513
1514 static void
1515 parse_cert_times(char *timespec)
1516 {
1517 char *from, *to;
1518 time_t now = time(NULL);
1519 int64_t secs;
1520
1521 /* +timespec relative to now */
1522 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1523 if ((secs = convtime(timespec + 1)) == -1)
1524 fatal("Invalid relative certificate life %s", timespec);
1525 cert_valid_to = now + secs;
1526 /*
1527 * Backdate certificate one minute to avoid problems on hosts
1528 * with poorly-synchronised clocks.
1529 */
1530 cert_valid_from = ((now - 59)/ 60) * 60;
1531 return;
1532 }
1533
1534 /*
1535 * from:to, where
1536 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1537 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1538 */
1539 from = xstrdup(timespec);
1540 to = strchr(from, ':');
1541 if (to == NULL || from == to || *(to + 1) == '\0')
1542 fatal("Invalid certificate life specification %s", timespec);
1543 *to++ = '\0';
1544
1545 if (*from == '-' || *from == '+')
1546 cert_valid_from = parse_relative_time(from, now);
1547 else
1548 cert_valid_from = parse_absolute_time(from);
1549
1550 if (*to == '-' || *to == '+')
1551 cert_valid_to = parse_relative_time(to, cert_valid_from);
1552 else
1553 cert_valid_to = parse_absolute_time(to);
1554
1555 if (cert_valid_to <= cert_valid_from)
1556 fatal("Empty certificate validity interval");
1557 xfree(from);
1558 }
1559
1560 static void
1561 add_cert_option(char *opt)
1562 {
1563 char *val;
1564
1565 if (strcmp(opt, "clear") == 0)
1566 certflags_flags = 0;
1567 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1568 certflags_flags &= ~CERTOPT_X_FWD;
1569 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1570 certflags_flags |= CERTOPT_X_FWD;
1571 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
1572 certflags_flags &= ~CERTOPT_AGENT_FWD;
1573 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
1574 certflags_flags |= CERTOPT_AGENT_FWD;
1575 else if (strcasecmp(opt, "no-port-forwarding") == 0)
1576 certflags_flags &= ~CERTOPT_PORT_FWD;
1577 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
1578 certflags_flags |= CERTOPT_PORT_FWD;
1579 else if (strcasecmp(opt, "no-pty") == 0)
1580 certflags_flags &= ~CERTOPT_PTY;
1581 else if (strcasecmp(opt, "permit-pty") == 0)
1582 certflags_flags |= CERTOPT_PTY;
1583 else if (strcasecmp(opt, "no-user-rc") == 0)
1584 certflags_flags &= ~CERTOPT_USER_RC;
1585 else if (strcasecmp(opt, "permit-user-rc") == 0)
1586 certflags_flags |= CERTOPT_USER_RC;
1587 else if (strncasecmp(opt, "force-command=", 14) == 0) {
1588 val = opt + 14;
1589 if (*val == '\0')
1590 fatal("Empty force-command option");
1591 if (certflags_command != NULL)
1592 fatal("force-command already specified");
1593 certflags_command = xstrdup(val);
1594 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
1595 val = opt + 15;
1596 if (*val == '\0')
1597 fatal("Empty source-address option");
1598 if (certflags_src_addr != NULL)
1599 fatal("source-address already specified");
1600 if (addr_match_cidr_list(NULL, val) != 0)
1601 fatal("Invalid source-address list");
1602 certflags_src_addr = xstrdup(val);
1603 } else
1604 fatal("Unsupported certificate option \"%s\"", opt);
1605 }
1606
1607 static void
1608 show_options(const Buffer *optbuf, int v00, int in_critical)
1609 {
1610 u_char *name, *data;
1611 u_int dlen;
1612 Buffer options, option;
1613
1614 buffer_init(&options);
1615 buffer_append(&options, buffer_ptr(optbuf), buffer_len(optbuf));
1616
1617 buffer_init(&option);
1618 while (buffer_len(&options) != 0) {
1619 name = buffer_get_string(&options, NULL);
1620 data = buffer_get_string_ptr(&options, &dlen);
1621 buffer_append(&option, data, dlen);
1622 printf(" %s", name);
1623 if ((v00 || !in_critical) &&
1624 (strcmp(name, "permit-X11-forwarding") == 0 ||
1625 strcmp(name, "permit-agent-forwarding") == 0 ||
1626 strcmp(name, "permit-port-forwarding") == 0 ||
1627 strcmp(name, "permit-pty") == 0 ||
1628 strcmp(name, "permit-user-rc") == 0))
1629 printf("\n");
1630 else if ((v00 || in_critical) &&
1631 (strcmp(name, "force-command") == 0 ||
1632 strcmp(name, "source-address") == 0)) {
1633 data = buffer_get_string(&option, NULL);
1634 printf(" %s\n", data);
1635 xfree(data);
1636 } else {
1637 printf(" UNKNOWN OPTION (len %u)\n",
1638 buffer_len(&option));
1639 buffer_clear(&option);
1640 }
1641 xfree(name);
1642 if (buffer_len(&option) != 0)
1643 fatal("Option corrupt: extra data at end");
1644 }
1645 buffer_free(&option);
1646 buffer_free(&options);
1647 }
1648
1649 static void
1650 do_show_cert(struct passwd *pw)
1651 {
1652 Key *key;
1653 struct stat st;
1654 char *key_fp, *ca_fp;
1655 u_int i, v00;
1656
1657 if (!have_identity)
1658 ask_filename(pw, "Enter file in which the key is");
1659 if (stat(identity_file, &st) < 0)
1660 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
1661 if ((key = key_load_public(identity_file, NULL)) == NULL)
1662 fatal("%s is not a public key", identity_file);
1663 if (!key_is_cert(key))
1664 fatal("%s is not a certificate", identity_file);
1665 v00 = key->type == KEY_RSA_CERT_V00 || key->type == KEY_DSA_CERT_V00;
1666
1667 key_fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
1668 ca_fp = key_fingerprint(key->cert->signature_key,
1669 SSH_FP_MD5, SSH_FP_HEX);
1670
1671 printf("%s:\n", identity_file);
1672 printf(" Type: %s %s certificate\n", key_ssh_name(key),
1673 key_cert_type(key));
1674 printf(" Public key: %s %s\n", key_type(key), key_fp);
1675 printf(" Signing CA: %s %s\n",
1676 key_type(key->cert->signature_key), ca_fp);
1677 printf(" Key ID: \"%s\"\n", key->cert->key_id);
1678 if (!v00)
1679 printf(" Serial: %llu\n", key->cert->serial);
1680 printf(" Valid: %s\n",
1681 fmt_validity(key->cert->valid_after, key->cert->valid_before));
1682 printf(" Principals: ");
1683 if (key->cert->nprincipals == 0)
1684 printf("(none)\n");
1685 else {
1686 for (i = 0; i < key->cert->nprincipals; i++)
1687 printf("\n %s",
1688 key->cert->principals[i]);
1689 printf("\n");
1690 }
1691 printf(" Critical Options: ");
1692 if (buffer_len(&key->cert->critical) == 0)
1693 printf("(none)\n");
1694 else {
1695 printf("\n");
1696 show_options(&key->cert->critical, v00, 1);
1697 }
1698 if (!v00) {
1699 printf(" Extensions: ");
1700 if (buffer_len(&key->cert->extensions) == 0)
1701 printf("(none)\n");
1702 else {
1703 printf("\n");
1704 show_options(&key->cert->extensions, v00, 0);
1705 }
1706 }
1707 exit(0);
1708 }
1709
1710 static void
1711 usage(void)
1712 {
1713 fprintf(stderr, "usage: %s [options]\n", __progname);
1714 fprintf(stderr, "Options:\n");
1715 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1716 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1717 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1718 fprintf(stderr, " -C comment Provide new comment.\n");
1719 fprintf(stderr, " -c Change comment in private and public key files.\n");
1720 #ifdef ENABLE_PKCS11
1721 fprintf(stderr, " -D pkcs11 Download public key from pkcs11 token.\n");
1722 #endif
1723 fprintf(stderr, " -e Export OpenSSH to foreign format key file.\n");
1724 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1725 fprintf(stderr, " -f filename Filename of the key file.\n");
1726 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1727 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1728 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1729 fprintf(stderr, " -h Generate host certificate instead of a user certificate.\n");
1730 fprintf(stderr, " -I key_id Key identifier to include in certificate.\n");
1731 fprintf(stderr, " -i Import foreign format to OpenSSH key file.\n");
1732 fprintf(stderr, " -L Print the contents of a certificate.\n");
1733 fprintf(stderr, " -l Show fingerprint of key file.\n");
1734 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1735 fprintf(stderr, " -m key_fmt Conversion format for -e/-i (PEM|PKCS8|RFC4716).\n");
1736 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1737 fprintf(stderr, " -n name,... User/host principal names to include in certificate\n");
1738 fprintf(stderr, " -O option Specify a certificate option.\n");
1739 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1740 fprintf(stderr, " -p Change passphrase of private key file.\n");
1741 fprintf(stderr, " -q Quiet.\n");
1742 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1743 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1744 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1745 fprintf(stderr, " -s ca_key Certify keys with CA key.\n");
1746 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1747 fprintf(stderr, " -t type Specify type of key to create.\n");
1748 fprintf(stderr, " -V from:to Specify certificate validity interval.\n");
1749 fprintf(stderr, " -v Verbose.\n");
1750 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1751 fprintf(stderr, " -y Read private key file and print public key.\n");
1752 fprintf(stderr, " -z serial Specify a serial number.\n");
1753
1754 exit(1);
1755 }
1756
1757 /*
1758 * Main program for key management.
1759 */
1760 int
1761 main(int argc, char **argv)
1762 {
1763 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1764 char out_file[MAXPATHLEN], *rr_hostname = NULL;
1765 Key *private, *public;
1766 struct passwd *pw;
1767 struct stat st;
1768 int opt, type, fd;
1769 u_int maxbits;
1770 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1771 int do_gen_candidates = 0, do_screen_candidates = 0;
1772 BIGNUM *start = NULL;
1773 FILE *f;
1774 const char *errstr;
1775
1776 extern int optind;
1777 extern char *optarg;
1778
1779 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1780 sanitise_stdfd();
1781
1782 __progname = ssh_get_progname(argv[0]);
1783
1784 SSLeay_add_all_algorithms();
1785 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1786
1787 init_rng();
1788 seed_rng();
1789
1790 /* we need this for the home * directory. */
1791 pw = getpwuid(getuid());
1792 if (!pw) {
1793 printf("You don't exist, go away!\n");
1794 exit(1);
1795 }
1796 if (gethostname(hostname, sizeof(hostname)) < 0) {
1797 perror("gethostname");
1798 exit(1);
1799 }
1800
1801 while ((opt = getopt(argc, argv, "degiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:"
1802 "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) {
1803 switch (opt) {
1804 case 'b':
1805 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1806 if (errstr)
1807 fatal("Bits has bad value %s (%s)",
1808 optarg, errstr);
1809 break;
1810 case 'F':
1811 find_host = 1;
1812 rr_hostname = optarg;
1813 break;
1814 case 'H':
1815 hash_hosts = 1;
1816 break;
1817 case 'I':
1818 cert_key_id = optarg;
1819 break;
1820 case 'R':
1821 delete_host = 1;
1822 rr_hostname = optarg;
1823 break;
1824 case 'L':
1825 show_cert = 1;
1826 break;
1827 case 'l':
1828 print_fingerprint = 1;
1829 break;
1830 case 'B':
1831 print_bubblebabble = 1;
1832 break;
1833 case 'm':
1834 if (strcasecmp(optarg, "RFC4716") == 0 ||
1835 strcasecmp(optarg, "ssh2") == 0) {
1836 convert_format = FMT_RFC4716;
1837 break;
1838 }
1839 if (strcasecmp(optarg, "PKCS8") == 0) {
1840 convert_format = FMT_PKCS8;
1841 break;
1842 }
1843 if (strcasecmp(optarg, "PEM") == 0) {
1844 convert_format = FMT_PEM;
1845 break;
1846 }
1847 fatal("Unsupported conversion format \"%s\"", optarg);
1848 case 'n':
1849 cert_principals = optarg;
1850 break;
1851 case 'p':
1852 change_passphrase = 1;
1853 break;
1854 case 'c':
1855 change_comment = 1;
1856 break;
1857 case 'f':
1858 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1859 sizeof(identity_file))
1860 fatal("Identity filename too long");
1861 have_identity = 1;
1862 break;
1863 case 'g':
1864 print_generic = 1;
1865 break;
1866 case 'P':
1867 identity_passphrase = optarg;
1868 break;
1869 case 'N':
1870 identity_new_passphrase = optarg;
1871 break;
1872 case 'O':
1873 add_cert_option(optarg);
1874 break;
1875 case 'C':
1876 identity_comment = optarg;
1877 break;
1878 case 'q':
1879 quiet = 1;
1880 break;
1881 case 'e':
1882 case 'x':
1883 /* export key */
1884 convert_to = 1;
1885 break;
1886 case 'h':
1887 cert_key_type = SSH2_CERT_TYPE_HOST;
1888 certflags_flags = 0;
1889 break;
1890 case 'i':
1891 case 'X':
1892 /* import key */
1893 convert_from = 1;
1894 break;
1895 case 'y':
1896 print_public = 1;
1897 break;
1898 case 'd':
1899 key_type_name = "dsa";
1900 break;
1901 case 's':
1902 ca_key_path = optarg;
1903 break;
1904 case 't':
1905 key_type_name = optarg;
1906 break;
1907 case 'D':
1908 pkcs11provider = optarg;
1909 break;
1910 case 'v':
1911 if (log_level == SYSLOG_LEVEL_INFO)
1912 log_level = SYSLOG_LEVEL_DEBUG1;
1913 else {
1914 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1915 log_level < SYSLOG_LEVEL_DEBUG3)
1916 log_level++;
1917 }
1918 break;
1919 case 'r':
1920 rr_hostname = optarg;
1921 break;
1922 case 'W':
1923 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1924 UINT_MAX, &errstr);
1925 if (errstr)
1926 fatal("Desired generator has bad value: %s (%s)",
1927 optarg, errstr);
1928 break;
1929 case 'a':
1930 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1931 if (errstr)
1932 fatal("Invalid number of trials: %s (%s)",
1933 optarg, errstr);
1934 break;
1935 case 'M':
1936 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1937 if (errstr)
1938 fatal("Memory limit is %s: %s", errstr, optarg);
1939 break;
1940 case 'G':
1941 do_gen_candidates = 1;
1942 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1943 sizeof(out_file))
1944 fatal("Output filename too long");
1945 break;
1946 case 'T':
1947 do_screen_candidates = 1;
1948 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1949 sizeof(out_file))
1950 fatal("Output filename too long");
1951 break;
1952 case 'S':
1953 /* XXX - also compare length against bits */
1954 if (BN_hex2bn(&start, optarg) == 0)
1955 fatal("Invalid start point.");
1956 break;
1957 case 'V':
1958 parse_cert_times(optarg);
1959 break;
1960 case 'z':
1961 cert_serial = strtonum(optarg, 0, LLONG_MAX, &errstr);
1962 if (errstr)
1963 fatal("Invalid serial number: %s", errstr);
1964 break;
1965 case '?':
1966 default:
1967 usage();
1968 }
1969 }
1970
1971 /* reinit */
1972 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
1973
1974 argv += optind;
1975 argc -= optind;
1976
1977 if (ca_key_path != NULL) {
1978 if (argc < 1) {
1979 printf("Too few arguments.\n");
1980 usage();
1981 }
1982 } else if (argc > 0) {
1983 printf("Too many arguments.\n");
1984 usage();
1985 }
1986 if (change_passphrase && change_comment) {
1987 printf("Can only have one of -p and -c.\n");
1988 usage();
1989 }
1990 if (print_fingerprint && (delete_host || hash_hosts)) {
1991 printf("Cannot use -l with -D or -R.\n");
1992 usage();
1993 }
1994 if (ca_key_path != NULL) {
1995 if (cert_key_id == NULL)
1996 fatal("Must specify key id (-I) when certifying");
1997 do_ca_sign(pw, argc, argv);
1998 }
1999 if (show_cert)
2000 do_show_cert(pw);
2001 if (delete_host || hash_hosts || find_host)
2002 do_known_hosts(pw, rr_hostname);
2003 if (print_fingerprint || print_bubblebabble)
2004 do_fingerprint(pw);
2005 if (change_passphrase)
2006 do_change_passphrase(pw);
2007 if (change_comment)
2008 do_change_comment(pw);
2009 if (convert_to)
2010 do_convert_to(pw);
2011 if (convert_from)
2012 do_convert_from(pw);
2013 if (print_public)
2014 do_print_public(pw);
2015 if (rr_hostname != NULL) {
2016 unsigned int n = 0;
2017
2018 if (have_identity) {
2019 n = do_print_resource_record(pw,
2020 identity_file, rr_hostname);
2021 if (n == 0) {
2022 perror(identity_file);
2023 exit(1);
2024 }
2025 exit(0);
2026 } else {
2027
2028 n += do_print_resource_record(pw,
2029 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
2030 n += do_print_resource_record(pw,
2031 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
2032
2033 if (n == 0)
2034 fatal("no keys found.");
2035 exit(0);
2036 }
2037 }
2038 if (pkcs11provider != NULL)
2039 do_download(pw);
2040
2041 if (do_gen_candidates) {
2042 FILE *out = fopen(out_file, "w");
2043
2044 if (out == NULL) {
2045 error("Couldn't open modulus candidate file \"%s\": %s",
2046 out_file, strerror(errno));
2047 return (1);
2048 }
2049 if (bits == 0)
2050 bits = DEFAULT_BITS;
2051 if (gen_candidates(out, memory, bits, start) != 0)
2052 fatal("modulus candidate generation failed");
2053
2054 return (0);
2055 }
2056
2057 if (do_screen_candidates) {
2058 FILE *in;
2059 FILE *out = fopen(out_file, "w");
2060
2061 if (have_identity && strcmp(identity_file, "-") != 0) {
2062 if ((in = fopen(identity_file, "r")) == NULL) {
2063 fatal("Couldn't open modulus candidate "
2064 "file \"%s\": %s", identity_file,
2065 strerror(errno));
2066 }
2067 } else
2068 in = stdin;
2069
2070 if (out == NULL) {
2071 fatal("Couldn't open moduli file \"%s\": %s",
2072 out_file, strerror(errno));
2073 }
2074 if (prime_test(in, out, trials, generator_wanted) != 0)
2075 fatal("modulus screening failed");
2076 return (0);
2077 }
2078
2079 arc4random_stir();
2080
2081 if (key_type_name == NULL)
2082 key_type_name = "rsa";
2083
2084 type = key_type_from_name(key_type_name);
2085 if (type == KEY_UNSPEC) {
2086 fprintf(stderr, "unknown key type %s\n", key_type_name);
2087 exit(1);
2088 }
2089 if (bits == 0)
2090 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
2091 maxbits = (type == KEY_DSA) ?
2092 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS;
2093 if (bits > maxbits) {
2094 fprintf(stderr, "key bits exceeds maximum %d\n", maxbits);
2095 exit(1);
2096 }
2097 if (type == KEY_DSA && bits != 1024)
2098 fatal("DSA keys must be 1024 bits");
2099 if (!quiet)
2100 printf("Generating public/private %s key pair.\n", key_type_name);
2101 private = key_generate(type, bits);
2102 if (private == NULL) {
2103 fprintf(stderr, "key_generate failed\n");
2104 exit(1);
2105 }
2106 public = key_from_private(private);
2107
2108 if (!have_identity)
2109 ask_filename(pw, "Enter file in which to save the key");
2110
2111 /* Create ~/.ssh directory if it doesn't already exist. */
2112 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s",
2113 pw->pw_dir, _PATH_SSH_USER_DIR);
2114 if (strstr(identity_file, dotsshdir) != NULL) {
2115 if (stat(dotsshdir, &st) < 0) {
2116 if (errno != ENOENT) {
2117 error("Could not stat %s: %s", dotsshdir,
2118 strerror(errno));
2119 } else if (mkdir(dotsshdir, 0700) < 0) {
2120 error("Could not create directory '%s': %s",
2121 dotsshdir, strerror(errno));
2122 } else if (!quiet)
2123 printf("Created directory '%s'.\n", dotsshdir);
2124 }
2125 }
2126 /* If the file already exists, ask the user to confirm. */
2127 if (stat(identity_file, &st) >= 0) {
2128 char yesno[3];
2129 printf("%s already exists.\n", identity_file);
2130 printf("Overwrite (y/n)? ");
2131 fflush(stdout);
2132 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
2133 exit(1);
2134 if (yesno[0] != 'y' && yesno[0] != 'Y')
2135 exit(1);
2136 }
2137 /* Ask for a passphrase (twice). */
2138 if (identity_passphrase)
2139 passphrase1 = xstrdup(identity_passphrase);
2140 else if (identity_new_passphrase)
2141 passphrase1 = xstrdup(identity_new_passphrase);
2142 else {
2143 passphrase_again:
2144 passphrase1 =
2145 read_passphrase("Enter passphrase (empty for no "
2146 "passphrase): ", RP_ALLOW_STDIN);
2147 passphrase2 = read_passphrase("Enter same passphrase again: ",
2148 RP_ALLOW_STDIN);
2149 if (strcmp(passphrase1, passphrase2) != 0) {
2150 /*
2151 * The passphrases do not match. Clear them and
2152 * retry.
2153 */
2154 memset(passphrase1, 0, strlen(passphrase1));
2155 memset(passphrase2, 0, strlen(passphrase2));
2156 xfree(passphrase1);
2157 xfree(passphrase2);
2158 printf("Passphrases do not match. Try again.\n");
2159 goto passphrase_again;
2160 }
2161 /* Clear the other copy of the passphrase. */
2162 memset(passphrase2, 0, strlen(passphrase2));
2163 xfree(passphrase2);
2164 }
2165
2166 if (identity_comment) {
2167 strlcpy(comment, identity_comment, sizeof(comment));
2168 } else {
2169 /* Create default comment field for the passphrase. */
2170 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
2171 }
2172
2173 /* Save the key with the given passphrase and comment. */
2174 if (!key_save_private(private, identity_file, passphrase1, comment)) {
2175 printf("Saving the key failed: %s.\n", identity_file);
2176 memset(passphrase1, 0, strlen(passphrase1));
2177 xfree(passphrase1);
2178 exit(1);
2179 }
2180 /* Clear the passphrase. */
2181 memset(passphrase1, 0, strlen(passphrase1));
2182 xfree(passphrase1);
2183
2184 /* Clear the private key and the random number generator. */
2185 key_free(private);
2186 arc4random_stir();
2187
2188 if (!quiet)
2189 printf("Your identification has been saved in %s.\n", identity_file);
2190
2191 strlcat(identity_file, ".pub", sizeof(identity_file));
2192 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
2193 if (fd == -1) {
2194 printf("Could not save your public key in %s\n", identity_file);
2195 exit(1);
2196 }
2197 f = fdopen(fd, "w");
2198 if (f == NULL) {
2199 printf("fdopen %s failed\n", identity_file);
2200 exit(1);
2201 }
2202 if (!key_write(public, f))
2203 fprintf(stderr, "write key failed\n");
2204 fprintf(f, " %s\n", comment);
2205 fclose(f);
2206
2207 if (!quiet) {
2208 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
2209 char *ra = key_fingerprint(public, SSH_FP_MD5,
2210 SSH_FP_RANDOMART);
2211 printf("Your public key has been saved in %s.\n",
2212 identity_file);
2213 printf("The key fingerprint is:\n");
2214 printf("%s %s\n", fp, comment);
2215 printf("The key's randomart image is:\n");
2216 printf("%s\n", ra);
2217 xfree(ra);
2218 xfree(fp);
2219 }
2220
2221 key_free(public);
2222 exit(0);
2223 }
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