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- (djm) Release OpenSSH 4.3p1
[openssh-git.git] / ssh-keygen.c
blob64fadc7a1d7fdb65a93ba3bacaaa80aa1c96d3d1
1 /*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Identity and host key generation and maintenance.
6 *
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 */
13
14 #include "includes.h"
15 RCSID("$OpenBSD: ssh-keygen.c,v 1.135 2005/11/29 02:04:55 dtucker Exp $");
16
17 #include <openssl/evp.h>
18 #include <openssl/pem.h>
19
20 #include "xmalloc.h"
21 #include "key.h"
22 #include "rsa.h"
23 #include "authfile.h"
24 #include "uuencode.h"
25 #include "buffer.h"
26 #include "bufaux.h"
27 #include "pathnames.h"
28 #include "log.h"
29 #include "misc.h"
30 #include "match.h"
31 #include "hostfile.h"
32
33 #ifdef SMARTCARD
34 #include "scard.h"
35 #endif
36 #include "dns.h"
37
38 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
39 #define DEFAULT_BITS 2048
40 #define DEFAULT_BITS_DSA 1024
41 u_int32_t bits = 0;
42
43 /*
44 * Flag indicating that we just want to change the passphrase. This can be
45 * set on the command line.
46 */
47 int change_passphrase = 0;
48
49 /*
50 * Flag indicating that we just want to change the comment. This can be set
51 * on the command line.
52 */
53 int change_comment = 0;
54
55 int quiet = 0;
56
57 /* Flag indicating that we want to hash a known_hosts file */
58 int hash_hosts = 0;
59 /* Flag indicating that we want lookup a host in known_hosts file */
60 int find_host = 0;
61 /* Flag indicating that we want to delete a host from a known_hosts file */
62 int delete_host = 0;
63
64 /* Flag indicating that we just want to see the key fingerprint */
65 int print_fingerprint = 0;
66 int print_bubblebabble = 0;
67
68 /* The identity file name, given on the command line or entered by the user. */
69 char identity_file[1024];
70 int have_identity = 0;
71
72 /* This is set to the passphrase if given on the command line. */
73 char *identity_passphrase = NULL;
74
75 /* This is set to the new passphrase if given on the command line. */
76 char *identity_new_passphrase = NULL;
77
78 /* This is set to the new comment if given on the command line. */
79 char *identity_comment = NULL;
80
81 /* Dump public key file in format used by real and the original SSH 2 */
82 int convert_to_ssh2 = 0;
83 int convert_from_ssh2 = 0;
84 int print_public = 0;
85 int print_generic = 0;
86
87 char *key_type_name = NULL;
88
89 /* argv0 */
90 extern char *__progname;
91
92 char hostname[MAXHOSTNAMELEN];
93
94 /* moduli.c */
95 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
96 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
97
98 static void
99 ask_filename(struct passwd *pw, const char *prompt)
100 {
101 char buf[1024];
102 char *name = NULL;
103
104 if (key_type_name == NULL)
105 name = _PATH_SSH_CLIENT_ID_RSA;
106 else
107 switch (key_type_from_name(key_type_name)) {
108 case KEY_RSA1:
109 name = _PATH_SSH_CLIENT_IDENTITY;
110 break;
111 case KEY_DSA:
112 name = _PATH_SSH_CLIENT_ID_DSA;
113 break;
114 case KEY_RSA:
115 name = _PATH_SSH_CLIENT_ID_RSA;
116 break;
117 default:
118 fprintf(stderr, "bad key type");
119 exit(1);
120 break;
121 }
122
123 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
124 fprintf(stderr, "%s (%s): ", prompt, identity_file);
125 if (fgets(buf, sizeof(buf), stdin) == NULL)
126 exit(1);
127 if (strchr(buf, '\n'))
128 *strchr(buf, '\n') = 0;
129 if (strcmp(buf, "") != 0)
130 strlcpy(identity_file, buf, sizeof(identity_file));
131 have_identity = 1;
132 }
133
134 static Key *
135 load_identity(char *filename)
136 {
137 char *pass;
138 Key *prv;
139
140 prv = key_load_private(filename, "", NULL);
141 if (prv == NULL) {
142 if (identity_passphrase)
143 pass = xstrdup(identity_passphrase);
144 else
145 pass = read_passphrase("Enter passphrase: ",
146 RP_ALLOW_STDIN);
147 prv = key_load_private(filename, pass, NULL);
148 memset(pass, 0, strlen(pass));
149 xfree(pass);
150 }
151 return prv;
152 }
153
154 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
155 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
156 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
157 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
158
159 static void
160 do_convert_to_ssh2(struct passwd *pw)
161 {
162 Key *k;
163 u_int len;
164 u_char *blob;
165 struct stat st;
166
167 if (!have_identity)
168 ask_filename(pw, "Enter file in which the key is");
169 if (stat(identity_file, &st) < 0) {
170 perror(identity_file);
171 exit(1);
172 }
173 if ((k = key_load_public(identity_file, NULL)) == NULL) {
174 if ((k = load_identity(identity_file)) == NULL) {
175 fprintf(stderr, "load failed\n");
176 exit(1);
177 }
178 }
179 if (k->type == KEY_RSA1) {
180 fprintf(stderr, "version 1 keys are not supported\n");
181 exit(1);
182 }
183 if (key_to_blob(k, &blob, &len) <= 0) {
184 fprintf(stderr, "key_to_blob failed\n");
185 exit(1);
186 }
187 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
188 fprintf(stdout,
189 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
190 key_size(k), key_type(k),
191 pw->pw_name, hostname);
192 dump_base64(stdout, blob, len);
193 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
194 key_free(k);
195 xfree(blob);
196 exit(0);
197 }
198
199 static void
200 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
201 {
202 u_int bignum_bits = buffer_get_int(b);
203 u_int bytes = (bignum_bits + 7) / 8;
204
205 if (buffer_len(b) < bytes)
206 fatal("buffer_get_bignum_bits: input buffer too small: "
207 "need %d have %d", bytes, buffer_len(b));
208 BN_bin2bn(buffer_ptr(b), bytes, value);
209 buffer_consume(b, bytes);
210 }
211
212 static Key *
213 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
214 {
215 Buffer b;
216 Key *key = NULL;
217 char *type, *cipher;
218 u_char *sig, data[] = "abcde12345";
219 int magic, rlen, ktype, i1, i2, i3, i4;
220 u_int slen;
221 u_long e;
222
223 buffer_init(&b);
224 buffer_append(&b, blob, blen);
225
226 magic = buffer_get_int(&b);
227 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
228 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
229 buffer_free(&b);
230 return NULL;
231 }
232 i1 = buffer_get_int(&b);
233 type = buffer_get_string(&b, NULL);
234 cipher = buffer_get_string(&b, NULL);
235 i2 = buffer_get_int(&b);
236 i3 = buffer_get_int(&b);
237 i4 = buffer_get_int(&b);
238 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
239 if (strcmp(cipher, "none") != 0) {
240 error("unsupported cipher %s", cipher);
241 xfree(cipher);
242 buffer_free(&b);
243 xfree(type);
244 return NULL;
245 }
246 xfree(cipher);
247
248 if (strstr(type, "dsa")) {
249 ktype = KEY_DSA;
250 } else if (strstr(type, "rsa")) {
251 ktype = KEY_RSA;
252 } else {
253 buffer_free(&b);
254 xfree(type);
255 return NULL;
256 }
257 key = key_new_private(ktype);
258 xfree(type);
259
260 switch (key->type) {
261 case KEY_DSA:
262 buffer_get_bignum_bits(&b, key->dsa->p);
263 buffer_get_bignum_bits(&b, key->dsa->g);
264 buffer_get_bignum_bits(&b, key->dsa->q);
265 buffer_get_bignum_bits(&b, key->dsa->pub_key);
266 buffer_get_bignum_bits(&b, key->dsa->priv_key);
267 break;
268 case KEY_RSA:
269 e = buffer_get_char(&b);
270 debug("e %lx", e);
271 if (e < 30) {
272 e <<= 8;
273 e += buffer_get_char(&b);
274 debug("e %lx", e);
275 e <<= 8;
276 e += buffer_get_char(&b);
277 debug("e %lx", e);
278 }
279 if (!BN_set_word(key->rsa->e, e)) {
280 buffer_free(&b);
281 key_free(key);
282 return NULL;
283 }
284 buffer_get_bignum_bits(&b, key->rsa->d);
285 buffer_get_bignum_bits(&b, key->rsa->n);
286 buffer_get_bignum_bits(&b, key->rsa->iqmp);
287 buffer_get_bignum_bits(&b, key->rsa->q);
288 buffer_get_bignum_bits(&b, key->rsa->p);
289 rsa_generate_additional_parameters(key->rsa);
290 break;
291 }
292 rlen = buffer_len(&b);
293 if (rlen != 0)
294 error("do_convert_private_ssh2_from_blob: "
295 "remaining bytes in key blob %d", rlen);
296 buffer_free(&b);
297
298 /* try the key */
299 key_sign(key, &sig, &slen, data, sizeof(data));
300 key_verify(key, sig, slen, data, sizeof(data));
301 xfree(sig);
302 return key;
303 }
304
305 static void
306 do_convert_from_ssh2(struct passwd *pw)
307 {
308 Key *k;
309 int blen;
310 u_int len;
311 char line[1024], *p;
312 u_char blob[8096];
313 char encoded[8096];
314 struct stat st;
315 int escaped = 0, private = 0, ok;
316 FILE *fp;
317
318 if (!have_identity)
319 ask_filename(pw, "Enter file in which the key is");
320 if (stat(identity_file, &st) < 0) {
321 perror(identity_file);
322 exit(1);
323 }
324 fp = fopen(identity_file, "r");
325 if (fp == NULL) {
326 perror(identity_file);
327 exit(1);
328 }
329 encoded[0] = '\0';
330 while (fgets(line, sizeof(line), fp)) {
331 if (!(p = strchr(line, '\n'))) {
332 fprintf(stderr, "input line too long.\n");
333 exit(1);
334 }
335 if (p > line && p[-1] == '\\')
336 escaped++;
337 if (strncmp(line, "----", 4) == 0 ||
338 strstr(line, ": ") != NULL) {
339 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
340 private = 1;
341 if (strstr(line, " END ") != NULL) {
342 break;
343 }
344 /* fprintf(stderr, "ignore: %s", line); */
345 continue;
346 }
347 if (escaped) {
348 escaped--;
349 /* fprintf(stderr, "escaped: %s", line); */
350 continue;
351 }
352 *p = '\0';
353 strlcat(encoded, line, sizeof(encoded));
354 }
355 len = strlen(encoded);
356 if (((len % 4) == 3) &&
357 (encoded[len-1] == '=') &&
358 (encoded[len-2] == '=') &&
359 (encoded[len-3] == '='))
360 encoded[len-3] = '\0';
361 blen = uudecode(encoded, blob, sizeof(blob));
362 if (blen < 0) {
363 fprintf(stderr, "uudecode failed.\n");
364 exit(1);
365 }
366 k = private ?
367 do_convert_private_ssh2_from_blob(blob, blen) :
368 key_from_blob(blob, blen);
369 if (k == NULL) {
370 fprintf(stderr, "decode blob failed.\n");
371 exit(1);
372 }
373 ok = private ?
374 (k->type == KEY_DSA ?
375 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
376 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
377 key_write(k, stdout);
378 if (!ok) {
379 fprintf(stderr, "key write failed");
380 exit(1);
381 }
382 key_free(k);
383 if (!private)
384 fprintf(stdout, "\n");
385 fclose(fp);
386 exit(0);
387 }
388
389 static void
390 do_print_public(struct passwd *pw)
391 {
392 Key *prv;
393 struct stat st;
394
395 if (!have_identity)
396 ask_filename(pw, "Enter file in which the key is");
397 if (stat(identity_file, &st) < 0) {
398 perror(identity_file);
399 exit(1);
400 }
401 prv = load_identity(identity_file);
402 if (prv == NULL) {
403 fprintf(stderr, "load failed\n");
404 exit(1);
405 }
406 if (!key_write(prv, stdout))
407 fprintf(stderr, "key_write failed");
408 key_free(prv);
409 fprintf(stdout, "\n");
410 exit(0);
411 }
412
413 #ifdef SMARTCARD
414 static void
415 do_upload(struct passwd *pw, const char *sc_reader_id)
416 {
417 Key *prv = NULL;
418 struct stat st;
419 int ret;
420
421 if (!have_identity)
422 ask_filename(pw, "Enter file in which the key is");
423 if (stat(identity_file, &st) < 0) {
424 perror(identity_file);
425 exit(1);
426 }
427 prv = load_identity(identity_file);
428 if (prv == NULL) {
429 error("load failed");
430 exit(1);
431 }
432 ret = sc_put_key(prv, sc_reader_id);
433 key_free(prv);
434 if (ret < 0)
435 exit(1);
436 logit("loading key done");
437 exit(0);
438 }
439
440 static void
441 do_download(struct passwd *pw, const char *sc_reader_id)
442 {
443 Key **keys = NULL;
444 int i;
445
446 keys = sc_get_keys(sc_reader_id, NULL);
447 if (keys == NULL)
448 fatal("cannot read public key from smartcard");
449 for (i = 0; keys[i]; i++) {
450 key_write(keys[i], stdout);
451 key_free(keys[i]);
452 fprintf(stdout, "\n");
453 }
454 xfree(keys);
455 exit(0);
456 }
457 #endif /* SMARTCARD */
458
459 static void
460 do_fingerprint(struct passwd *pw)
461 {
462 FILE *f;
463 Key *public;
464 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
465 int i, skip = 0, num = 1, invalid = 1;
466 enum fp_rep rep;
467 enum fp_type fptype;
468 struct stat st;
469
470 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
471 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
472
473 if (!have_identity)
474 ask_filename(pw, "Enter file in which the key is");
475 if (stat(identity_file, &st) < 0) {
476 perror(identity_file);
477 exit(1);
478 }
479 public = key_load_public(identity_file, &comment);
480 if (public != NULL) {
481 fp = key_fingerprint(public, fptype, rep);
482 printf("%u %s %s\n", key_size(public), fp, comment);
483 key_free(public);
484 xfree(comment);
485 xfree(fp);
486 exit(0);
487 }
488 if (comment)
489 xfree(comment);
490
491 f = fopen(identity_file, "r");
492 if (f != NULL) {
493 while (fgets(line, sizeof(line), f)) {
494 i = strlen(line) - 1;
495 if (line[i] != '\n') {
496 error("line %d too long: %.40s...", num, line);
497 skip = 1;
498 continue;
499 }
500 num++;
501 if (skip) {
502 skip = 0;
503 continue;
504 }
505 line[i] = '\0';
506
507 /* Skip leading whitespace, empty and comment lines. */
508 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
509 ;
510 if (!*cp || *cp == '\n' || *cp == '#')
511 continue ;
512 i = strtol(cp, &ep, 10);
513 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
514 int quoted = 0;
515 comment = cp;
516 for (; *cp && (quoted || (*cp != ' ' &&
517 *cp != '\t')); cp++) {
518 if (*cp == '\\' && cp[1] == '"')
519 cp++; /* Skip both */
520 else if (*cp == '"')
521 quoted = !quoted;
522 }
523 if (!*cp)
524 continue;
525 *cp++ = '\0';
526 }
527 ep = cp;
528 public = key_new(KEY_RSA1);
529 if (key_read(public, &cp) != 1) {
530 cp = ep;
531 key_free(public);
532 public = key_new(KEY_UNSPEC);
533 if (key_read(public, &cp) != 1) {
534 key_free(public);
535 continue;
536 }
537 }
538 comment = *cp ? cp : comment;
539 fp = key_fingerprint(public, fptype, rep);
540 printf("%u %s %s\n", key_size(public), fp,
541 comment ? comment : "no comment");
542 xfree(fp);
543 key_free(public);
544 invalid = 0;
545 }
546 fclose(f);
547 }
548 if (invalid) {
549 printf("%s is not a public key file.\n", identity_file);
550 exit(1);
551 }
552 exit(0);
553 }
554
555 static void
556 print_host(FILE *f, char *name, Key *public, int hash)
557 {
558 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
559 fatal("hash_host failed");
560 fprintf(f, "%s ", name);
561 if (!key_write(public, f))
562 fatal("key_write failed");
563 fprintf(f, "\n");
564 }
565
566 static void
567 do_known_hosts(struct passwd *pw, const char *name)
568 {
569 FILE *in, *out = stdout;
570 Key *public;
571 char *cp, *cp2, *kp, *kp2;
572 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
573 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
574
575 if (!have_identity) {
576 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
577 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
578 sizeof(identity_file))
579 fatal("Specified known hosts path too long");
580 xfree(cp);
581 have_identity = 1;
582 }
583 if ((in = fopen(identity_file, "r")) == NULL)
584 fatal("fopen: %s", strerror(errno));
585
586 /*
587 * Find hosts goes to stdout, hash and deletions happen in-place
588 * A corner case is ssh-keygen -HF foo, which should go to stdout
589 */
590 if (!find_host && (hash_hosts || delete_host)) {
591 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
592 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
593 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
594 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
595 fatal("known_hosts path too long");
596 umask(077);
597 if ((c = mkstemp(tmp)) == -1)
598 fatal("mkstemp: %s", strerror(errno));
599 if ((out = fdopen(c, "w")) == NULL) {
600 c = errno;
601 unlink(tmp);
602 fatal("fdopen: %s", strerror(c));
603 }
604 inplace = 1;
605 }
606
607 while (fgets(line, sizeof(line), in)) {
608 num++;
609 i = strlen(line) - 1;
610 if (line[i] != '\n') {
611 error("line %d too long: %.40s...", num, line);
612 skip = 1;
613 invalid = 1;
614 continue;
615 }
616 if (skip) {
617 skip = 0;
618 continue;
619 }
620 line[i] = '\0';
621
622 /* Skip leading whitespace, empty and comment lines. */
623 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
624 ;
625 if (!*cp || *cp == '\n' || *cp == '#') {
626 if (inplace)
627 fprintf(out, "%s\n", cp);
628 continue;
629 }
630 /* Find the end of the host name portion. */
631 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
632 ;
633 if (*kp == '\0' || *(kp + 1) == '\0') {
634 error("line %d missing key: %.40s...",
635 num, line);
636 invalid = 1;
637 continue;
638 }
639 *kp++ = '\0';
640 kp2 = kp;
641
642 public = key_new(KEY_RSA1);
643 if (key_read(public, &kp) != 1) {
644 kp = kp2;
645 key_free(public);
646 public = key_new(KEY_UNSPEC);
647 if (key_read(public, &kp) != 1) {
648 error("line %d invalid key: %.40s...",
649 num, line);
650 key_free(public);
651 invalid = 1;
652 continue;
653 }
654 }
655
656 if (*cp == HASH_DELIM) {
657 if (find_host || delete_host) {
658 cp2 = host_hash(name, cp, strlen(cp));
659 if (cp2 == NULL) {
660 error("line %d: invalid hashed "
661 "name: %.64s...", num, line);
662 invalid = 1;
663 continue;
664 }
665 c = (strcmp(cp2, cp) == 0);
666 if (find_host && c) {
667 printf("# Host %s found: "
668 "line %d type %s\n", name,
669 num, key_type(public));
670 print_host(out, cp, public, 0);
671 }
672 if (delete_host && !c)
673 print_host(out, cp, public, 0);
674 } else if (hash_hosts)
675 print_host(out, cp, public, 0);
676 } else {
677 if (find_host || delete_host) {
678 c = (match_hostname(name, cp,
679 strlen(cp)) == 1);
680 if (find_host && c) {
681 printf("# Host %s found: "
682 "line %d type %s\n", name,
683 num, key_type(public));
684 print_host(out, cp, public, hash_hosts);
685 }
686 if (delete_host && !c)
687 print_host(out, cp, public, 0);
688 } else if (hash_hosts) {
689 for (cp2 = strsep(&cp, ",");
690 cp2 != NULL && *cp2 != '\0';
691 cp2 = strsep(&cp, ",")) {
692 if (strcspn(cp2, "*?!") != strlen(cp2))
693 fprintf(stderr, "Warning: "
694 "ignoring host name with "
695 "metacharacters: %.64s\n",
696 cp2);
697 else
698 print_host(out, cp2, public, 1);
699 }
700 has_unhashed = 1;
701 }
702 }
703 key_free(public);
704 }
705 fclose(in);
706
707 if (invalid) {
708 fprintf(stderr, "%s is not a valid known_host file.\n",
709 identity_file);
710 if (inplace) {
711 fprintf(stderr, "Not replacing existing known_hosts "
712 "file because of errors\n");
713 fclose(out);
714 unlink(tmp);
715 }
716 exit(1);
717 }
718
719 if (inplace) {
720 fclose(out);
721
722 /* Backup existing file */
723 if (unlink(old) == -1 && errno != ENOENT)
724 fatal("unlink %.100s: %s", old, strerror(errno));
725 if (link(identity_file, old) == -1)
726 fatal("link %.100s to %.100s: %s", identity_file, old,
727 strerror(errno));
728 /* Move new one into place */
729 if (rename(tmp, identity_file) == -1) {
730 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
731 strerror(errno));
732 unlink(tmp);
733 unlink(old);
734 exit(1);
735 }
736
737 fprintf(stderr, "%s updated.\n", identity_file);
738 fprintf(stderr, "Original contents retained as %s\n", old);
739 if (has_unhashed) {
740 fprintf(stderr, "WARNING: %s contains unhashed "
741 "entries\n", old);
742 fprintf(stderr, "Delete this file to ensure privacy "
743 "of hostnames\n");
744 }
745 }
746
747 exit(0);
748 }
749
750 /*
751 * Perform changing a passphrase. The argument is the passwd structure
752 * for the current user.
753 */
754 static void
755 do_change_passphrase(struct passwd *pw)
756 {
757 char *comment;
758 char *old_passphrase, *passphrase1, *passphrase2;
759 struct stat st;
760 Key *private;
761
762 if (!have_identity)
763 ask_filename(pw, "Enter file in which the key is");
764 if (stat(identity_file, &st) < 0) {
765 perror(identity_file);
766 exit(1);
767 }
768 /* Try to load the file with empty passphrase. */
769 private = key_load_private(identity_file, "", &comment);
770 if (private == NULL) {
771 if (identity_passphrase)
772 old_passphrase = xstrdup(identity_passphrase);
773 else
774 old_passphrase =
775 read_passphrase("Enter old passphrase: ",
776 RP_ALLOW_STDIN);
777 private = key_load_private(identity_file, old_passphrase,
778 &comment);
779 memset(old_passphrase, 0, strlen(old_passphrase));
780 xfree(old_passphrase);
781 if (private == NULL) {
782 printf("Bad passphrase.\n");
783 exit(1);
784 }
785 }
786 printf("Key has comment '%s'\n", comment);
787
788 /* Ask the new passphrase (twice). */
789 if (identity_new_passphrase) {
790 passphrase1 = xstrdup(identity_new_passphrase);
791 passphrase2 = NULL;
792 } else {
793 passphrase1 =
794 read_passphrase("Enter new passphrase (empty for no "
795 "passphrase): ", RP_ALLOW_STDIN);
796 passphrase2 = read_passphrase("Enter same passphrase again: ",
797 RP_ALLOW_STDIN);
798
799 /* Verify that they are the same. */
800 if (strcmp(passphrase1, passphrase2) != 0) {
801 memset(passphrase1, 0, strlen(passphrase1));
802 memset(passphrase2, 0, strlen(passphrase2));
803 xfree(passphrase1);
804 xfree(passphrase2);
805 printf("Pass phrases do not match. Try again.\n");
806 exit(1);
807 }
808 /* Destroy the other copy. */
809 memset(passphrase2, 0, strlen(passphrase2));
810 xfree(passphrase2);
811 }
812
813 /* Save the file using the new passphrase. */
814 if (!key_save_private(private, identity_file, passphrase1, comment)) {
815 printf("Saving the key failed: %s.\n", identity_file);
816 memset(passphrase1, 0, strlen(passphrase1));
817 xfree(passphrase1);
818 key_free(private);
819 xfree(comment);
820 exit(1);
821 }
822 /* Destroy the passphrase and the copy of the key in memory. */
823 memset(passphrase1, 0, strlen(passphrase1));
824 xfree(passphrase1);
825 key_free(private); /* Destroys contents */
826 xfree(comment);
827
828 printf("Your identification has been saved with the new passphrase.\n");
829 exit(0);
830 }
831
832 /*
833 * Print the SSHFP RR.
834 */
835 static void
836 do_print_resource_record(struct passwd *pw, char *hname)
837 {
838 Key *public;
839 char *comment = NULL;
840 struct stat st;
841
842 if (!have_identity)
843 ask_filename(pw, "Enter file in which the key is");
844 if (stat(identity_file, &st) < 0) {
845 perror(identity_file);
846 exit(1);
847 }
848 public = key_load_public(identity_file, &comment);
849 if (public != NULL) {
850 export_dns_rr(hname, public, stdout, print_generic);
851 key_free(public);
852 xfree(comment);
853 exit(0);
854 }
855 if (comment)
856 xfree(comment);
857
858 printf("failed to read v2 public key from %s.\n", identity_file);
859 exit(1);
860 }
861
862 /*
863 * Change the comment of a private key file.
864 */
865 static void
866 do_change_comment(struct passwd *pw)
867 {
868 char new_comment[1024], *comment, *passphrase;
869 Key *private;
870 Key *public;
871 struct stat st;
872 FILE *f;
873 int fd;
874
875 if (!have_identity)
876 ask_filename(pw, "Enter file in which the key is");
877 if (stat(identity_file, &st) < 0) {
878 perror(identity_file);
879 exit(1);
880 }
881 private = key_load_private(identity_file, "", &comment);
882 if (private == NULL) {
883 if (identity_passphrase)
884 passphrase = xstrdup(identity_passphrase);
885 else if (identity_new_passphrase)
886 passphrase = xstrdup(identity_new_passphrase);
887 else
888 passphrase = read_passphrase("Enter passphrase: ",
889 RP_ALLOW_STDIN);
890 /* Try to load using the passphrase. */
891 private = key_load_private(identity_file, passphrase, &comment);
892 if (private == NULL) {
893 memset(passphrase, 0, strlen(passphrase));
894 xfree(passphrase);
895 printf("Bad passphrase.\n");
896 exit(1);
897 }
898 } else {
899 passphrase = xstrdup("");
900 }
901 if (private->type != KEY_RSA1) {
902 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
903 key_free(private);
904 exit(1);
905 }
906 printf("Key now has comment '%s'\n", comment);
907
908 if (identity_comment) {
909 strlcpy(new_comment, identity_comment, sizeof(new_comment));
910 } else {
911 printf("Enter new comment: ");
912 fflush(stdout);
913 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
914 memset(passphrase, 0, strlen(passphrase));
915 key_free(private);
916 exit(1);
917 }
918 if (strchr(new_comment, '\n'))
919 *strchr(new_comment, '\n') = 0;
920 }
921
922 /* Save the file using the new passphrase. */
923 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
924 printf("Saving the key failed: %s.\n", identity_file);
925 memset(passphrase, 0, strlen(passphrase));
926 xfree(passphrase);
927 key_free(private);
928 xfree(comment);
929 exit(1);
930 }
931 memset(passphrase, 0, strlen(passphrase));
932 xfree(passphrase);
933 public = key_from_private(private);
934 key_free(private);
935
936 strlcat(identity_file, ".pub", sizeof(identity_file));
937 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
938 if (fd == -1) {
939 printf("Could not save your public key in %s\n", identity_file);
940 exit(1);
941 }
942 f = fdopen(fd, "w");
943 if (f == NULL) {
944 printf("fdopen %s failed", identity_file);
945 exit(1);
946 }
947 if (!key_write(public, f))
948 fprintf(stderr, "write key failed");
949 key_free(public);
950 fprintf(f, " %s\n", new_comment);
951 fclose(f);
952
953 xfree(comment);
954
955 printf("The comment in your key file has been changed.\n");
956 exit(0);
957 }
958
959 static void
960 usage(void)
961 {
962 fprintf(stderr, "Usage: %s [options]\n", __progname);
963 fprintf(stderr, "Options:\n");
964 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
965 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
966 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
967 fprintf(stderr, " -C comment Provide new comment.\n");
968 fprintf(stderr, " -c Change comment in private and public key files.\n");
969 #ifdef SMARTCARD
970 fprintf(stderr, " -D reader Download public key from smartcard.\n");
971 #endif /* SMARTCARD */
972 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
973 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
974 fprintf(stderr, " -f filename Filename of the key file.\n");
975 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
976 fprintf(stderr, " -g Use generic DNS resource record format.\n");
977 fprintf(stderr, " -H Hash names in known_hosts file.\n");
978 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
979 fprintf(stderr, " -l Show fingerprint of key file.\n");
980 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
981 fprintf(stderr, " -N phrase Provide new passphrase.\n");
982 fprintf(stderr, " -P phrase Provide old passphrase.\n");
983 fprintf(stderr, " -p Change passphrase of private key file.\n");
984 fprintf(stderr, " -q Quiet.\n");
985 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
986 fprintf(stderr, " -r hostname Print DNS resource record.\n");
987 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
988 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
989 fprintf(stderr, " -t type Specify type of key to create.\n");
990 #ifdef SMARTCARD
991 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
992 #endif /* SMARTCARD */
993 fprintf(stderr, " -v Verbose.\n");
994 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
995 fprintf(stderr, " -y Read private key file and print public key.\n");
996
997 exit(1);
998 }
999
1000 /*
1001 * Main program for key management.
1002 */
1003 int
1004 main(int ac, char **av)
1005 {
1006 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1007 char out_file[MAXPATHLEN], *reader_id = NULL;
1008 char *rr_hostname = NULL;
1009 Key *private, *public;
1010 struct passwd *pw;
1011 struct stat st;
1012 int opt, type, fd, download = 0;
1013 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1014 int do_gen_candidates = 0, do_screen_candidates = 0;
1015 int log_level = SYSLOG_LEVEL_INFO;
1016 BIGNUM *start = NULL;
1017 FILE *f;
1018 const char *errstr;
1019
1020 extern int optind;
1021 extern char *optarg;
1022
1023 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1024 sanitise_stdfd();
1025
1026 __progname = ssh_get_progname(av[0]);
1027
1028 SSLeay_add_all_algorithms();
1029 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1030
1031 init_rng();
1032 seed_rng();
1033
1034 /* we need this for the home * directory. */
1035 pw = getpwuid(getuid());
1036 if (!pw) {
1037 printf("You don't exist, go away!\n");
1038 exit(1);
1039 }
1040 if (gethostname(hostname, sizeof(hostname)) < 0) {
1041 perror("gethostname");
1042 exit(1);
1043 }
1044
1045 while ((opt = getopt(ac, av,
1046 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1047 switch (opt) {
1048 case 'b':
1049 bits = strtonum(optarg, 768, 32768, &errstr);
1050 if (errstr)
1051 fatal("Bits has bad value %s (%s)",
1052 optarg, errstr);
1053 break;
1054 case 'F':
1055 find_host = 1;
1056 rr_hostname = optarg;
1057 break;
1058 case 'H':
1059 hash_hosts = 1;
1060 break;
1061 case 'R':
1062 delete_host = 1;
1063 rr_hostname = optarg;
1064 break;
1065 case 'l':
1066 print_fingerprint = 1;
1067 break;
1068 case 'B':
1069 print_bubblebabble = 1;
1070 break;
1071 case 'p':
1072 change_passphrase = 1;
1073 break;
1074 case 'c':
1075 change_comment = 1;
1076 break;
1077 case 'f':
1078 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1079 sizeof(identity_file))
1080 fatal("Identity filename too long");
1081 have_identity = 1;
1082 break;
1083 case 'g':
1084 print_generic = 1;
1085 break;
1086 case 'P':
1087 identity_passphrase = optarg;
1088 break;
1089 case 'N':
1090 identity_new_passphrase = optarg;
1091 break;
1092 case 'C':
1093 identity_comment = optarg;
1094 break;
1095 case 'q':
1096 quiet = 1;
1097 break;
1098 case 'e':
1099 case 'x':
1100 /* export key */
1101 convert_to_ssh2 = 1;
1102 break;
1103 case 'i':
1104 case 'X':
1105 /* import key */
1106 convert_from_ssh2 = 1;
1107 break;
1108 case 'y':
1109 print_public = 1;
1110 break;
1111 case 'd':
1112 key_type_name = "dsa";
1113 break;
1114 case 't':
1115 key_type_name = optarg;
1116 break;
1117 case 'D':
1118 download = 1;
1119 case 'U':
1120 reader_id = optarg;
1121 break;
1122 case 'v':
1123 if (log_level == SYSLOG_LEVEL_INFO)
1124 log_level = SYSLOG_LEVEL_DEBUG1;
1125 else {
1126 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1127 log_level < SYSLOG_LEVEL_DEBUG3)
1128 log_level++;
1129 }
1130 break;
1131 case 'r':
1132 rr_hostname = optarg;
1133 break;
1134 case 'W':
1135 generator_wanted = strtonum(optarg, 1, UINT_MAX, &errstr);
1136 if (errstr)
1137 fatal("Desired generator has bad value: %s (%s)",
1138 optarg, errstr);
1139 break;
1140 case 'a':
1141 trials = strtonum(optarg, 1, UINT_MAX, &errstr);
1142 if (errstr)
1143 fatal("Invalid number of trials: %s (%s)",
1144 optarg, errstr);
1145 break;
1146 case 'M':
1147 memory = strtonum(optarg, 1, UINT_MAX, &errstr);
1148 if (errstr) {
1149 fatal("Memory limit is %s: %s", errstr, optarg);
1150 }
1151 break;
1152 case 'G':
1153 do_gen_candidates = 1;
1154 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1155 sizeof(out_file))
1156 fatal("Output filename too long");
1157 break;
1158 case 'T':
1159 do_screen_candidates = 1;
1160 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1161 sizeof(out_file))
1162 fatal("Output filename too long");
1163 break;
1164 case 'S':
1165 /* XXX - also compare length against bits */
1166 if (BN_hex2bn(&start, optarg) == 0)
1167 fatal("Invalid start point.");
1168 break;
1169 case '?':
1170 default:
1171 usage();
1172 }
1173 }
1174
1175 /* reinit */
1176 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1177
1178 if (optind < ac) {
1179 printf("Too many arguments.\n");
1180 usage();
1181 }
1182 if (change_passphrase && change_comment) {
1183 printf("Can only have one of -p and -c.\n");
1184 usage();
1185 }
1186 if (delete_host || hash_hosts || find_host)
1187 do_known_hosts(pw, rr_hostname);
1188 if (print_fingerprint || print_bubblebabble)
1189 do_fingerprint(pw);
1190 if (change_passphrase)
1191 do_change_passphrase(pw);
1192 if (change_comment)
1193 do_change_comment(pw);
1194 if (convert_to_ssh2)
1195 do_convert_to_ssh2(pw);
1196 if (convert_from_ssh2)
1197 do_convert_from_ssh2(pw);
1198 if (print_public)
1199 do_print_public(pw);
1200 if (rr_hostname != NULL) {
1201 do_print_resource_record(pw, rr_hostname);
1202 }
1203 if (reader_id != NULL) {
1204 #ifdef SMARTCARD
1205 if (download)
1206 do_download(pw, reader_id);
1207 else
1208 do_upload(pw, reader_id);
1209 #else /* SMARTCARD */
1210 fatal("no support for smartcards.");
1211 #endif /* SMARTCARD */
1212 }
1213
1214 if (do_gen_candidates) {
1215 FILE *out = fopen(out_file, "w");
1216
1217 if (out == NULL) {
1218 error("Couldn't open modulus candidate file \"%s\": %s",
1219 out_file, strerror(errno));
1220 return (1);
1221 }
1222 if (bits == 0)
1223 bits = DEFAULT_BITS;
1224 if (gen_candidates(out, memory, bits, start) != 0)
1225 fatal("modulus candidate generation failed");
1226
1227 return (0);
1228 }
1229
1230 if (do_screen_candidates) {
1231 FILE *in;
1232 FILE *out = fopen(out_file, "w");
1233
1234 if (have_identity && strcmp(identity_file, "-") != 0) {
1235 if ((in = fopen(identity_file, "r")) == NULL) {
1236 fatal("Couldn't open modulus candidate "
1237 "file \"%s\": %s", identity_file,
1238 strerror(errno));
1239 }
1240 } else
1241 in = stdin;
1242
1243 if (out == NULL) {
1244 fatal("Couldn't open moduli file \"%s\": %s",
1245 out_file, strerror(errno));
1246 }
1247 if (prime_test(in, out, trials, generator_wanted) != 0)
1248 fatal("modulus screening failed");
1249 return (0);
1250 }
1251
1252 arc4random_stir();
1253
1254 if (key_type_name == NULL)
1255 key_type_name = "rsa";
1256
1257 type = key_type_from_name(key_type_name);
1258 if (type == KEY_UNSPEC) {
1259 fprintf(stderr, "unknown key type %s\n", key_type_name);
1260 exit(1);
1261 }
1262 if (bits == 0)
1263 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1264 if (type == KEY_DSA && bits != 1024)
1265 fatal("DSA keys must be 1024 bits");
1266 if (!quiet)
1267 printf("Generating public/private %s key pair.\n", key_type_name);
1268 private = key_generate(type, bits);
1269 if (private == NULL) {
1270 fprintf(stderr, "key_generate failed");
1271 exit(1);
1272 }
1273 public = key_from_private(private);
1274
1275 if (!have_identity)
1276 ask_filename(pw, "Enter file in which to save the key");
1277
1278 /* Create ~/.ssh directory if it doesn't already exist. */
1279 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1280 if (strstr(identity_file, dotsshdir) != NULL &&
1281 stat(dotsshdir, &st) < 0) {
1282 if (mkdir(dotsshdir, 0700) < 0)
1283 error("Could not create directory '%s'.", dotsshdir);
1284 else if (!quiet)
1285 printf("Created directory '%s'.\n", dotsshdir);
1286 }
1287 /* If the file already exists, ask the user to confirm. */
1288 if (stat(identity_file, &st) >= 0) {
1289 char yesno[3];
1290 printf("%s already exists.\n", identity_file);
1291 printf("Overwrite (y/n)? ");
1292 fflush(stdout);
1293 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1294 exit(1);
1295 if (yesno[0] != 'y' && yesno[0] != 'Y')
1296 exit(1);
1297 }
1298 /* Ask for a passphrase (twice). */
1299 if (identity_passphrase)
1300 passphrase1 = xstrdup(identity_passphrase);
1301 else if (identity_new_passphrase)
1302 passphrase1 = xstrdup(identity_new_passphrase);
1303 else {
1304 passphrase_again:
1305 passphrase1 =
1306 read_passphrase("Enter passphrase (empty for no "
1307 "passphrase): ", RP_ALLOW_STDIN);
1308 passphrase2 = read_passphrase("Enter same passphrase again: ",
1309 RP_ALLOW_STDIN);
1310 if (strcmp(passphrase1, passphrase2) != 0) {
1311 /*
1312 * The passphrases do not match. Clear them and
1313 * retry.
1314 */
1315 memset(passphrase1, 0, strlen(passphrase1));
1316 memset(passphrase2, 0, strlen(passphrase2));
1317 xfree(passphrase1);
1318 xfree(passphrase2);
1319 printf("Passphrases do not match. Try again.\n");
1320 goto passphrase_again;
1321 }
1322 /* Clear the other copy of the passphrase. */
1323 memset(passphrase2, 0, strlen(passphrase2));
1324 xfree(passphrase2);
1325 }
1326
1327 if (identity_comment) {
1328 strlcpy(comment, identity_comment, sizeof(comment));
1329 } else {
1330 /* Create default commend field for the passphrase. */
1331 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1332 }
1333
1334 /* Save the key with the given passphrase and comment. */
1335 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1336 printf("Saving the key failed: %s.\n", identity_file);
1337 memset(passphrase1, 0, strlen(passphrase1));
1338 xfree(passphrase1);
1339 exit(1);
1340 }
1341 /* Clear the passphrase. */
1342 memset(passphrase1, 0, strlen(passphrase1));
1343 xfree(passphrase1);
1344
1345 /* Clear the private key and the random number generator. */
1346 key_free(private);
1347 arc4random_stir();
1348
1349 if (!quiet)
1350 printf("Your identification has been saved in %s.\n", identity_file);
1351
1352 strlcat(identity_file, ".pub", sizeof(identity_file));
1353 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1354 if (fd == -1) {
1355 printf("Could not save your public key in %s\n", identity_file);
1356 exit(1);
1357 }
1358 f = fdopen(fd, "w");
1359 if (f == NULL) {
1360 printf("fdopen %s failed", identity_file);
1361 exit(1);
1362 }
1363 if (!key_write(public, f))
1364 fprintf(stderr, "write key failed");
1365 fprintf(f, " %s\n", comment);
1366 fclose(f);
1367
1368 if (!quiet) {
1369 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1370 printf("Your public key has been saved in %s.\n",
1371 identity_file);
1372 printf("The key fingerprint is:\n");
1373 printf("%s %s\n", fp, comment);
1374 xfree(fp);
1375 }
1376
1377 key_free(public);
1378 exit(0);
1379 }
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