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- deraadt@cvs.openbsd.org 2006/08/03 03:34:42
[openssh-git.git] / ssh-keygen.c
blobc607e257e55a8ee44021973cc2a7bdc30bd68fa7
1 /* $OpenBSD: ssh-keygen.c,v 1.154 2006/08/03 03:34:42 deraadt 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
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <netdb.h>
28 #ifdef HAVE_PATHS_H
29 # include <paths.h>
30 #endif
31 #include <pwd.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 #include "xmalloc.h"
38 #include "key.h"
39 #include "rsa.h"
40 #include "authfile.h"
41 #include "uuencode.h"
42 #include "buffer.h"
43 #include "pathnames.h"
44 #include "log.h"
45 #include "misc.h"
46 #include "match.h"
47 #include "hostfile.h"
48 #include "dns.h"
49
50 #ifdef SMARTCARD
51 #include "scard.h"
52 #endif
53
54 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
55 #define DEFAULT_BITS 2048
56 #define DEFAULT_BITS_DSA 1024
57 u_int32_t bits = 0;
58
59 /*
60 * Flag indicating that we just want to change the passphrase. This can be
61 * set on the command line.
62 */
63 int change_passphrase = 0;
64
65 /*
66 * Flag indicating that we just want to change the comment. This can be set
67 * on the command line.
68 */
69 int change_comment = 0;
70
71 int quiet = 0;
72
73 /* Flag indicating that we want to hash a known_hosts file */
74 int hash_hosts = 0;
75 /* Flag indicating that we want lookup a host in known_hosts file */
76 int find_host = 0;
77 /* Flag indicating that we want to delete a host from a known_hosts file */
78 int delete_host = 0;
79
80 /* Flag indicating that we just want to see the key fingerprint */
81 int print_fingerprint = 0;
82 int print_bubblebabble = 0;
83
84 /* The identity file name, given on the command line or entered by the user. */
85 char identity_file[1024];
86 int have_identity = 0;
87
88 /* This is set to the passphrase if given on the command line. */
89 char *identity_passphrase = NULL;
90
91 /* This is set to the new passphrase if given on the command line. */
92 char *identity_new_passphrase = NULL;
93
94 /* This is set to the new comment if given on the command line. */
95 char *identity_comment = NULL;
96
97 /* Dump public key file in format used by real and the original SSH 2 */
98 int convert_to_ssh2 = 0;
99 int convert_from_ssh2 = 0;
100 int print_public = 0;
101 int print_generic = 0;
102
103 char *key_type_name = NULL;
104
105 /* argv0 */
106 extern char *__progname;
107
108 char hostname[MAXHOSTNAMELEN];
109
110 /* moduli.c */
111 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
112 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
113
114 static void
115 ask_filename(struct passwd *pw, const char *prompt)
116 {
117 char buf[1024];
118 char *name = NULL;
119
120 if (key_type_name == NULL)
121 name = _PATH_SSH_CLIENT_ID_RSA;
122 else {
123 switch (key_type_from_name(key_type_name)) {
124 case KEY_RSA1:
125 name = _PATH_SSH_CLIENT_IDENTITY;
126 break;
127 case KEY_DSA:
128 name = _PATH_SSH_CLIENT_ID_DSA;
129 break;
130 case KEY_RSA:
131 name = _PATH_SSH_CLIENT_ID_RSA;
132 break;
133 default:
134 fprintf(stderr, "bad key type");
135 exit(1);
136 break;
137 }
138 }
139 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
140 fprintf(stderr, "%s (%s): ", prompt, identity_file);
141 if (fgets(buf, sizeof(buf), stdin) == NULL)
142 exit(1);
143 if (strchr(buf, '\n'))
144 *strchr(buf, '\n') = 0;
145 if (strcmp(buf, "") != 0)
146 strlcpy(identity_file, buf, sizeof(identity_file));
147 have_identity = 1;
148 }
149
150 static Key *
151 load_identity(char *filename)
152 {
153 char *pass;
154 Key *prv;
155
156 prv = key_load_private(filename, "", NULL);
157 if (prv == NULL) {
158 if (identity_passphrase)
159 pass = xstrdup(identity_passphrase);
160 else
161 pass = read_passphrase("Enter passphrase: ",
162 RP_ALLOW_STDIN);
163 prv = key_load_private(filename, pass, NULL);
164 memset(pass, 0, strlen(pass));
165 xfree(pass);
166 }
167 return prv;
168 }
169
170 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
171 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
172 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
173 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
174
175 static void
176 do_convert_to_ssh2(struct passwd *pw)
177 {
178 Key *k;
179 u_int len;
180 u_char *blob;
181 struct stat st;
182
183 if (!have_identity)
184 ask_filename(pw, "Enter file in which the key is");
185 if (stat(identity_file, &st) < 0) {
186 perror(identity_file);
187 exit(1);
188 }
189 if ((k = key_load_public(identity_file, NULL)) == NULL) {
190 if ((k = load_identity(identity_file)) == NULL) {
191 fprintf(stderr, "load failed\n");
192 exit(1);
193 }
194 }
195 if (k->type == KEY_RSA1) {
196 fprintf(stderr, "version 1 keys are not supported\n");
197 exit(1);
198 }
199 if (key_to_blob(k, &blob, &len) <= 0) {
200 fprintf(stderr, "key_to_blob failed\n");
201 exit(1);
202 }
203 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
204 fprintf(stdout,
205 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
206 key_size(k), key_type(k),
207 pw->pw_name, hostname);
208 dump_base64(stdout, blob, len);
209 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
210 key_free(k);
211 xfree(blob);
212 exit(0);
213 }
214
215 static void
216 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
217 {
218 u_int bignum_bits = buffer_get_int(b);
219 u_int bytes = (bignum_bits + 7) / 8;
220
221 if (buffer_len(b) < bytes)
222 fatal("buffer_get_bignum_bits: input buffer too small: "
223 "need %d have %d", bytes, buffer_len(b));
224 BN_bin2bn(buffer_ptr(b), bytes, value);
225 buffer_consume(b, bytes);
226 }
227
228 static Key *
229 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
230 {
231 Buffer b;
232 Key *key = NULL;
233 char *type, *cipher;
234 u_char *sig, data[] = "abcde12345";
235 int magic, rlen, ktype, i1, i2, i3, i4;
236 u_int slen;
237 u_long e;
238
239 buffer_init(&b);
240 buffer_append(&b, blob, blen);
241
242 magic = buffer_get_int(&b);
243 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
244 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
245 buffer_free(&b);
246 return NULL;
247 }
248 i1 = buffer_get_int(&b);
249 type = buffer_get_string(&b, NULL);
250 cipher = buffer_get_string(&b, NULL);
251 i2 = buffer_get_int(&b);
252 i3 = buffer_get_int(&b);
253 i4 = buffer_get_int(&b);
254 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
255 if (strcmp(cipher, "none") != 0) {
256 error("unsupported cipher %s", cipher);
257 xfree(cipher);
258 buffer_free(&b);
259 xfree(type);
260 return NULL;
261 }
262 xfree(cipher);
263
264 if (strstr(type, "dsa")) {
265 ktype = KEY_DSA;
266 } else if (strstr(type, "rsa")) {
267 ktype = KEY_RSA;
268 } else {
269 buffer_free(&b);
270 xfree(type);
271 return NULL;
272 }
273 key = key_new_private(ktype);
274 xfree(type);
275
276 switch (key->type) {
277 case KEY_DSA:
278 buffer_get_bignum_bits(&b, key->dsa->p);
279 buffer_get_bignum_bits(&b, key->dsa->g);
280 buffer_get_bignum_bits(&b, key->dsa->q);
281 buffer_get_bignum_bits(&b, key->dsa->pub_key);
282 buffer_get_bignum_bits(&b, key->dsa->priv_key);
283 break;
284 case KEY_RSA:
285 e = buffer_get_char(&b);
286 debug("e %lx", e);
287 if (e < 30) {
288 e <<= 8;
289 e += buffer_get_char(&b);
290 debug("e %lx", e);
291 e <<= 8;
292 e += buffer_get_char(&b);
293 debug("e %lx", e);
294 }
295 if (!BN_set_word(key->rsa->e, e)) {
296 buffer_free(&b);
297 key_free(key);
298 return NULL;
299 }
300 buffer_get_bignum_bits(&b, key->rsa->d);
301 buffer_get_bignum_bits(&b, key->rsa->n);
302 buffer_get_bignum_bits(&b, key->rsa->iqmp);
303 buffer_get_bignum_bits(&b, key->rsa->q);
304 buffer_get_bignum_bits(&b, key->rsa->p);
305 rsa_generate_additional_parameters(key->rsa);
306 break;
307 }
308 rlen = buffer_len(&b);
309 if (rlen != 0)
310 error("do_convert_private_ssh2_from_blob: "
311 "remaining bytes in key blob %d", rlen);
312 buffer_free(&b);
313
314 /* try the key */
315 key_sign(key, &sig, &slen, data, sizeof(data));
316 key_verify(key, sig, slen, data, sizeof(data));
317 xfree(sig);
318 return key;
319 }
320
321 static int
322 get_line(FILE *fp, char *line, size_t len)
323 {
324 int c;
325 size_t pos = 0;
326
327 line[0] = '\0';
328 while ((c = fgetc(fp)) != EOF) {
329 if (pos >= len - 1) {
330 fprintf(stderr, "input line too long.\n");
331 exit(1);
332 }
333 switch (c) {
334 case '\r':
335 c = fgetc(fp);
336 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
337 fprintf(stderr, "unget: %s\n", strerror(errno));
338 exit(1);
339 }
340 return pos;
341 case '\n':
342 return pos;
343 }
344 line[pos++] = c;
345 line[pos] = '\0';
346 }
347 if (c == EOF)
348 return -1;
349 return pos;
350 }
351
352 static void
353 do_convert_from_ssh2(struct passwd *pw)
354 {
355 Key *k;
356 int blen;
357 u_int len;
358 char line[1024];
359 u_char blob[8096];
360 char encoded[8096];
361 struct stat st;
362 int escaped = 0, private = 0, ok;
363 FILE *fp;
364
365 if (!have_identity)
366 ask_filename(pw, "Enter file in which the key is");
367 if (stat(identity_file, &st) < 0) {
368 perror(identity_file);
369 exit(1);
370 }
371 fp = fopen(identity_file, "r");
372 if (fp == NULL) {
373 perror(identity_file);
374 exit(1);
375 }
376 encoded[0] = '\0';
377 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
378 if (line[blen - 1] == '\\')
379 escaped++;
380 if (strncmp(line, "----", 4) == 0 ||
381 strstr(line, ": ") != NULL) {
382 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
383 private = 1;
384 if (strstr(line, " END ") != NULL) {
385 break;
386 }
387 /* fprintf(stderr, "ignore: %s", line); */
388 continue;
389 }
390 if (escaped) {
391 escaped--;
392 /* fprintf(stderr, "escaped: %s", line); */
393 continue;
394 }
395 strlcat(encoded, line, sizeof(encoded));
396 }
397 len = strlen(encoded);
398 if (((len % 4) == 3) &&
399 (encoded[len-1] == '=') &&
400 (encoded[len-2] == '=') &&
401 (encoded[len-3] == '='))
402 encoded[len-3] = '\0';
403 blen = uudecode(encoded, blob, sizeof(blob));
404 if (blen < 0) {
405 fprintf(stderr, "uudecode failed.\n");
406 exit(1);
407 }
408 k = private ?
409 do_convert_private_ssh2_from_blob(blob, blen) :
410 key_from_blob(blob, blen);
411 if (k == NULL) {
412 fprintf(stderr, "decode blob failed.\n");
413 exit(1);
414 }
415 ok = private ?
416 (k->type == KEY_DSA ?
417 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
418 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
419 key_write(k, stdout);
420 if (!ok) {
421 fprintf(stderr, "key write failed");
422 exit(1);
423 }
424 key_free(k);
425 if (!private)
426 fprintf(stdout, "\n");
427 fclose(fp);
428 exit(0);
429 }
430
431 static void
432 do_print_public(struct passwd *pw)
433 {
434 Key *prv;
435 struct stat st;
436
437 if (!have_identity)
438 ask_filename(pw, "Enter file in which the key is");
439 if (stat(identity_file, &st) < 0) {
440 perror(identity_file);
441 exit(1);
442 }
443 prv = load_identity(identity_file);
444 if (prv == NULL) {
445 fprintf(stderr, "load failed\n");
446 exit(1);
447 }
448 if (!key_write(prv, stdout))
449 fprintf(stderr, "key_write failed");
450 key_free(prv);
451 fprintf(stdout, "\n");
452 exit(0);
453 }
454
455 #ifdef SMARTCARD
456 static void
457 do_upload(struct passwd *pw, const char *sc_reader_id)
458 {
459 Key *prv = NULL;
460 struct stat st;
461 int ret;
462
463 if (!have_identity)
464 ask_filename(pw, "Enter file in which the key is");
465 if (stat(identity_file, &st) < 0) {
466 perror(identity_file);
467 exit(1);
468 }
469 prv = load_identity(identity_file);
470 if (prv == NULL) {
471 error("load failed");
472 exit(1);
473 }
474 ret = sc_put_key(prv, sc_reader_id);
475 key_free(prv);
476 if (ret < 0)
477 exit(1);
478 logit("loading key done");
479 exit(0);
480 }
481
482 static void
483 do_download(struct passwd *pw, const char *sc_reader_id)
484 {
485 Key **keys = NULL;
486 int i;
487
488 keys = sc_get_keys(sc_reader_id, NULL);
489 if (keys == NULL)
490 fatal("cannot read public key from smartcard");
491 for (i = 0; keys[i]; i++) {
492 key_write(keys[i], stdout);
493 key_free(keys[i]);
494 fprintf(stdout, "\n");
495 }
496 xfree(keys);
497 exit(0);
498 }
499 #endif /* SMARTCARD */
500
501 static void
502 do_fingerprint(struct passwd *pw)
503 {
504 FILE *f;
505 Key *public;
506 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
507 int i, skip = 0, num = 1, invalid = 1;
508 enum fp_rep rep;
509 enum fp_type fptype;
510 struct stat st;
511
512 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
513 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
514
515 if (!have_identity)
516 ask_filename(pw, "Enter file in which the key is");
517 if (stat(identity_file, &st) < 0) {
518 perror(identity_file);
519 exit(1);
520 }
521 public = key_load_public(identity_file, &comment);
522 if (public != NULL) {
523 fp = key_fingerprint(public, fptype, rep);
524 printf("%u %s %s\n", key_size(public), fp, comment);
525 key_free(public);
526 xfree(comment);
527 xfree(fp);
528 exit(0);
529 }
530 if (comment) {
531 xfree(comment);
532 comment = NULL;
533 }
534
535 f = fopen(identity_file, "r");
536 if (f != NULL) {
537 while (fgets(line, sizeof(line), f)) {
538 i = strlen(line) - 1;
539 if (line[i] != '\n') {
540 error("line %d too long: %.40s...", num, line);
541 skip = 1;
542 continue;
543 }
544 num++;
545 if (skip) {
546 skip = 0;
547 continue;
548 }
549 line[i] = '\0';
550
551 /* Skip leading whitespace, empty and comment lines. */
552 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
553 ;
554 if (!*cp || *cp == '\n' || *cp == '#')
555 continue ;
556 i = strtol(cp, &ep, 10);
557 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
558 int quoted = 0;
559 comment = cp;
560 for (; *cp && (quoted || (*cp != ' ' &&
561 *cp != '\t')); cp++) {
562 if (*cp == '\\' && cp[1] == '"')
563 cp++; /* Skip both */
564 else if (*cp == '"')
565 quoted = !quoted;
566 }
567 if (!*cp)
568 continue;
569 *cp++ = '\0';
570 }
571 ep = cp;
572 public = key_new(KEY_RSA1);
573 if (key_read(public, &cp) != 1) {
574 cp = ep;
575 key_free(public);
576 public = key_new(KEY_UNSPEC);
577 if (key_read(public, &cp) != 1) {
578 key_free(public);
579 continue;
580 }
581 }
582 comment = *cp ? cp : comment;
583 fp = key_fingerprint(public, fptype, rep);
584 printf("%u %s %s\n", key_size(public), fp,
585 comment ? comment : "no comment");
586 xfree(fp);
587 key_free(public);
588 invalid = 0;
589 }
590 fclose(f);
591 }
592 if (invalid) {
593 printf("%s is not a public key file.\n", identity_file);
594 exit(1);
595 }
596 exit(0);
597 }
598
599 static void
600 print_host(FILE *f, char *name, Key *public, int hash)
601 {
602 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
603 fatal("hash_host failed");
604 fprintf(f, "%s ", name);
605 if (!key_write(public, f))
606 fatal("key_write failed");
607 fprintf(f, "\n");
608 }
609
610 static void
611 do_known_hosts(struct passwd *pw, const char *name)
612 {
613 FILE *in, *out = stdout;
614 Key *public;
615 char *cp, *cp2, *kp, *kp2;
616 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
617 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
618
619 if (!have_identity) {
620 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
621 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
622 sizeof(identity_file))
623 fatal("Specified known hosts path too long");
624 xfree(cp);
625 have_identity = 1;
626 }
627 if ((in = fopen(identity_file, "r")) == NULL)
628 fatal("fopen: %s", strerror(errno));
629
630 /*
631 * Find hosts goes to stdout, hash and deletions happen in-place
632 * A corner case is ssh-keygen -HF foo, which should go to stdout
633 */
634 if (!find_host && (hash_hosts || delete_host)) {
635 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
636 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
637 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
638 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
639 fatal("known_hosts path too long");
640 umask(077);
641 if ((c = mkstemp(tmp)) == -1)
642 fatal("mkstemp: %s", strerror(errno));
643 if ((out = fdopen(c, "w")) == NULL) {
644 c = errno;
645 unlink(tmp);
646 fatal("fdopen: %s", strerror(c));
647 }
648 inplace = 1;
649 }
650
651 while (fgets(line, sizeof(line), in)) {
652 num++;
653 i = strlen(line) - 1;
654 if (line[i] != '\n') {
655 error("line %d too long: %.40s...", num, line);
656 skip = 1;
657 invalid = 1;
658 continue;
659 }
660 if (skip) {
661 skip = 0;
662 continue;
663 }
664 line[i] = '\0';
665
666 /* Skip leading whitespace, empty and comment lines. */
667 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
668 ;
669 if (!*cp || *cp == '\n' || *cp == '#') {
670 if (inplace)
671 fprintf(out, "%s\n", cp);
672 continue;
673 }
674 /* Find the end of the host name portion. */
675 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
676 ;
677 if (*kp == '\0' || *(kp + 1) == '\0') {
678 error("line %d missing key: %.40s...",
679 num, line);
680 invalid = 1;
681 continue;
682 }
683 *kp++ = '\0';
684 kp2 = kp;
685
686 public = key_new(KEY_RSA1);
687 if (key_read(public, &kp) != 1) {
688 kp = kp2;
689 key_free(public);
690 public = key_new(KEY_UNSPEC);
691 if (key_read(public, &kp) != 1) {
692 error("line %d invalid key: %.40s...",
693 num, line);
694 key_free(public);
695 invalid = 1;
696 continue;
697 }
698 }
699
700 if (*cp == HASH_DELIM) {
701 if (find_host || delete_host) {
702 cp2 = host_hash(name, cp, strlen(cp));
703 if (cp2 == NULL) {
704 error("line %d: invalid hashed "
705 "name: %.64s...", num, line);
706 invalid = 1;
707 continue;
708 }
709 c = (strcmp(cp2, cp) == 0);
710 if (find_host && c) {
711 printf("# Host %s found: "
712 "line %d type %s\n", name,
713 num, key_type(public));
714 print_host(out, cp, public, 0);
715 }
716 if (delete_host && !c)
717 print_host(out, cp, public, 0);
718 } else if (hash_hosts)
719 print_host(out, cp, public, 0);
720 } else {
721 if (find_host || delete_host) {
722 c = (match_hostname(name, cp,
723 strlen(cp)) == 1);
724 if (find_host && c) {
725 printf("# Host %s found: "
726 "line %d type %s\n", name,
727 num, key_type(public));
728 print_host(out, cp, public, hash_hosts);
729 }
730 if (delete_host && !c)
731 print_host(out, cp, public, 0);
732 } else if (hash_hosts) {
733 for (cp2 = strsep(&cp, ",");
734 cp2 != NULL && *cp2 != '\0';
735 cp2 = strsep(&cp, ",")) {
736 if (strcspn(cp2, "*?!") != strlen(cp2))
737 fprintf(stderr, "Warning: "
738 "ignoring host name with "
739 "metacharacters: %.64s\n",
740 cp2);
741 else
742 print_host(out, cp2, public, 1);
743 }
744 has_unhashed = 1;
745 }
746 }
747 key_free(public);
748 }
749 fclose(in);
750
751 if (invalid) {
752 fprintf(stderr, "%s is not a valid known_host file.\n",
753 identity_file);
754 if (inplace) {
755 fprintf(stderr, "Not replacing existing known_hosts "
756 "file because of errors\n");
757 fclose(out);
758 unlink(tmp);
759 }
760 exit(1);
761 }
762
763 if (inplace) {
764 fclose(out);
765
766 /* Backup existing file */
767 if (unlink(old) == -1 && errno != ENOENT)
768 fatal("unlink %.100s: %s", old, strerror(errno));
769 if (link(identity_file, old) == -1)
770 fatal("link %.100s to %.100s: %s", identity_file, old,
771 strerror(errno));
772 /* Move new one into place */
773 if (rename(tmp, identity_file) == -1) {
774 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
775 strerror(errno));
776 unlink(tmp);
777 unlink(old);
778 exit(1);
779 }
780
781 fprintf(stderr, "%s updated.\n", identity_file);
782 fprintf(stderr, "Original contents retained as %s\n", old);
783 if (has_unhashed) {
784 fprintf(stderr, "WARNING: %s contains unhashed "
785 "entries\n", old);
786 fprintf(stderr, "Delete this file to ensure privacy "
787 "of hostnames\n");
788 }
789 }
790
791 exit(0);
792 }
793
794 /*
795 * Perform changing a passphrase. The argument is the passwd structure
796 * for the current user.
797 */
798 static void
799 do_change_passphrase(struct passwd *pw)
800 {
801 char *comment;
802 char *old_passphrase, *passphrase1, *passphrase2;
803 struct stat st;
804 Key *private;
805
806 if (!have_identity)
807 ask_filename(pw, "Enter file in which the key is");
808 if (stat(identity_file, &st) < 0) {
809 perror(identity_file);
810 exit(1);
811 }
812 /* Try to load the file with empty passphrase. */
813 private = key_load_private(identity_file, "", &comment);
814 if (private == NULL) {
815 if (identity_passphrase)
816 old_passphrase = xstrdup(identity_passphrase);
817 else
818 old_passphrase =
819 read_passphrase("Enter old passphrase: ",
820 RP_ALLOW_STDIN);
821 private = key_load_private(identity_file, old_passphrase,
822 &comment);
823 memset(old_passphrase, 0, strlen(old_passphrase));
824 xfree(old_passphrase);
825 if (private == NULL) {
826 printf("Bad passphrase.\n");
827 exit(1);
828 }
829 }
830 printf("Key has comment '%s'\n", comment);
831
832 /* Ask the new passphrase (twice). */
833 if (identity_new_passphrase) {
834 passphrase1 = xstrdup(identity_new_passphrase);
835 passphrase2 = NULL;
836 } else {
837 passphrase1 =
838 read_passphrase("Enter new passphrase (empty for no "
839 "passphrase): ", RP_ALLOW_STDIN);
840 passphrase2 = read_passphrase("Enter same passphrase again: ",
841 RP_ALLOW_STDIN);
842
843 /* Verify that they are the same. */
844 if (strcmp(passphrase1, passphrase2) != 0) {
845 memset(passphrase1, 0, strlen(passphrase1));
846 memset(passphrase2, 0, strlen(passphrase2));
847 xfree(passphrase1);
848 xfree(passphrase2);
849 printf("Pass phrases do not match. Try again.\n");
850 exit(1);
851 }
852 /* Destroy the other copy. */
853 memset(passphrase2, 0, strlen(passphrase2));
854 xfree(passphrase2);
855 }
856
857 /* Save the file using the new passphrase. */
858 if (!key_save_private(private, identity_file, passphrase1, comment)) {
859 printf("Saving the key failed: %s.\n", identity_file);
860 memset(passphrase1, 0, strlen(passphrase1));
861 xfree(passphrase1);
862 key_free(private);
863 xfree(comment);
864 exit(1);
865 }
866 /* Destroy the passphrase and the copy of the key in memory. */
867 memset(passphrase1, 0, strlen(passphrase1));
868 xfree(passphrase1);
869 key_free(private); /* Destroys contents */
870 xfree(comment);
871
872 printf("Your identification has been saved with the new passphrase.\n");
873 exit(0);
874 }
875
876 /*
877 * Print the SSHFP RR.
878 */
879 static int
880 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
881 {
882 Key *public;
883 char *comment = NULL;
884 struct stat st;
885
886 if (fname == NULL)
887 ask_filename(pw, "Enter file in which the key is");
888 if (stat(fname, &st) < 0) {
889 if (errno == ENOENT)
890 return 0;
891 perror(fname);
892 exit(1);
893 }
894 public = key_load_public(fname, &comment);
895 if (public != NULL) {
896 export_dns_rr(hname, public, stdout, print_generic);
897 key_free(public);
898 xfree(comment);
899 return 1;
900 }
901 if (comment)
902 xfree(comment);
903
904 printf("failed to read v2 public key from %s.\n", fname);
905 exit(1);
906 }
907
908 /*
909 * Change the comment of a private key file.
910 */
911 static void
912 do_change_comment(struct passwd *pw)
913 {
914 char new_comment[1024], *comment, *passphrase;
915 Key *private;
916 Key *public;
917 struct stat st;
918 FILE *f;
919 int fd;
920
921 if (!have_identity)
922 ask_filename(pw, "Enter file in which the key is");
923 if (stat(identity_file, &st) < 0) {
924 perror(identity_file);
925 exit(1);
926 }
927 private = key_load_private(identity_file, "", &comment);
928 if (private == NULL) {
929 if (identity_passphrase)
930 passphrase = xstrdup(identity_passphrase);
931 else if (identity_new_passphrase)
932 passphrase = xstrdup(identity_new_passphrase);
933 else
934 passphrase = read_passphrase("Enter passphrase: ",
935 RP_ALLOW_STDIN);
936 /* Try to load using the passphrase. */
937 private = key_load_private(identity_file, passphrase, &comment);
938 if (private == NULL) {
939 memset(passphrase, 0, strlen(passphrase));
940 xfree(passphrase);
941 printf("Bad passphrase.\n");
942 exit(1);
943 }
944 } else {
945 passphrase = xstrdup("");
946 }
947 if (private->type != KEY_RSA1) {
948 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
949 key_free(private);
950 exit(1);
951 }
952 printf("Key now has comment '%s'\n", comment);
953
954 if (identity_comment) {
955 strlcpy(new_comment, identity_comment, sizeof(new_comment));
956 } else {
957 printf("Enter new comment: ");
958 fflush(stdout);
959 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
960 memset(passphrase, 0, strlen(passphrase));
961 key_free(private);
962 exit(1);
963 }
964 if (strchr(new_comment, '\n'))
965 *strchr(new_comment, '\n') = 0;
966 }
967
968 /* Save the file using the new passphrase. */
969 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
970 printf("Saving the key failed: %s.\n", identity_file);
971 memset(passphrase, 0, strlen(passphrase));
972 xfree(passphrase);
973 key_free(private);
974 xfree(comment);
975 exit(1);
976 }
977 memset(passphrase, 0, strlen(passphrase));
978 xfree(passphrase);
979 public = key_from_private(private);
980 key_free(private);
981
982 strlcat(identity_file, ".pub", sizeof(identity_file));
983 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
984 if (fd == -1) {
985 printf("Could not save your public key in %s\n", identity_file);
986 exit(1);
987 }
988 f = fdopen(fd, "w");
989 if (f == NULL) {
990 printf("fdopen %s failed", identity_file);
991 exit(1);
992 }
993 if (!key_write(public, f))
994 fprintf(stderr, "write key failed");
995 key_free(public);
996 fprintf(f, " %s\n", new_comment);
997 fclose(f);
998
999 xfree(comment);
1000
1001 printf("The comment in your key file has been changed.\n");
1002 exit(0);
1003 }
1004
1005 static void
1006 usage(void)
1007 {
1008 fprintf(stderr, "Usage: %s [options]\n", __progname);
1009 fprintf(stderr, "Options:\n");
1010 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1011 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1012 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1013 fprintf(stderr, " -C comment Provide new comment.\n");
1014 fprintf(stderr, " -c Change comment in private and public key files.\n");
1015 #ifdef SMARTCARD
1016 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1017 #endif /* SMARTCARD */
1018 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
1019 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1020 fprintf(stderr, " -f filename Filename of the key file.\n");
1021 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1022 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1023 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1024 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
1025 fprintf(stderr, " -l Show fingerprint of key file.\n");
1026 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1027 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1028 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1029 fprintf(stderr, " -p Change passphrase of private key file.\n");
1030 fprintf(stderr, " -q Quiet.\n");
1031 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1032 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1033 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1034 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1035 fprintf(stderr, " -t type Specify type of key to create.\n");
1036 #ifdef SMARTCARD
1037 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1038 #endif /* SMARTCARD */
1039 fprintf(stderr, " -v Verbose.\n");
1040 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1041 fprintf(stderr, " -y Read private key file and print public key.\n");
1042
1043 exit(1);
1044 }
1045
1046 /*
1047 * Main program for key management.
1048 */
1049 int
1050 main(int ac, char **av)
1051 {
1052 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1053 char out_file[MAXPATHLEN], *reader_id = NULL;
1054 char *rr_hostname = NULL;
1055 Key *private, *public;
1056 struct passwd *pw;
1057 struct stat st;
1058 int opt, type, fd, download = 0;
1059 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1060 int do_gen_candidates = 0, do_screen_candidates = 0;
1061 int log_level = SYSLOG_LEVEL_INFO;
1062 BIGNUM *start = NULL;
1063 FILE *f;
1064 const char *errstr;
1065
1066 extern int optind;
1067 extern char *optarg;
1068
1069 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1070 sanitise_stdfd();
1071
1072 __progname = ssh_get_progname(av[0]);
1073
1074 SSLeay_add_all_algorithms();
1075 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1076
1077 init_rng();
1078 seed_rng();
1079
1080 /* we need this for the home * directory. */
1081 pw = getpwuid(getuid());
1082 if (!pw) {
1083 printf("You don't exist, go away!\n");
1084 exit(1);
1085 }
1086 if (gethostname(hostname, sizeof(hostname)) < 0) {
1087 perror("gethostname");
1088 exit(1);
1089 }
1090
1091 while ((opt = getopt(ac, av,
1092 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1093 switch (opt) {
1094 case 'b':
1095 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1096 if (errstr)
1097 fatal("Bits has bad value %s (%s)",
1098 optarg, errstr);
1099 break;
1100 case 'F':
1101 find_host = 1;
1102 rr_hostname = optarg;
1103 break;
1104 case 'H':
1105 hash_hosts = 1;
1106 break;
1107 case 'R':
1108 delete_host = 1;
1109 rr_hostname = optarg;
1110 break;
1111 case 'l':
1112 print_fingerprint = 1;
1113 break;
1114 case 'B':
1115 print_bubblebabble = 1;
1116 break;
1117 case 'p':
1118 change_passphrase = 1;
1119 break;
1120 case 'c':
1121 change_comment = 1;
1122 break;
1123 case 'f':
1124 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1125 sizeof(identity_file))
1126 fatal("Identity filename too long");
1127 have_identity = 1;
1128 break;
1129 case 'g':
1130 print_generic = 1;
1131 break;
1132 case 'P':
1133 identity_passphrase = optarg;
1134 break;
1135 case 'N':
1136 identity_new_passphrase = optarg;
1137 break;
1138 case 'C':
1139 identity_comment = optarg;
1140 break;
1141 case 'q':
1142 quiet = 1;
1143 break;
1144 case 'e':
1145 case 'x':
1146 /* export key */
1147 convert_to_ssh2 = 1;
1148 break;
1149 case 'i':
1150 case 'X':
1151 /* import key */
1152 convert_from_ssh2 = 1;
1153 break;
1154 case 'y':
1155 print_public = 1;
1156 break;
1157 case 'd':
1158 key_type_name = "dsa";
1159 break;
1160 case 't':
1161 key_type_name = optarg;
1162 break;
1163 case 'D':
1164 download = 1;
1165 /*FALLTHROUGH*/
1166 case 'U':
1167 reader_id = optarg;
1168 break;
1169 case 'v':
1170 if (log_level == SYSLOG_LEVEL_INFO)
1171 log_level = SYSLOG_LEVEL_DEBUG1;
1172 else {
1173 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1174 log_level < SYSLOG_LEVEL_DEBUG3)
1175 log_level++;
1176 }
1177 break;
1178 case 'r':
1179 rr_hostname = optarg;
1180 break;
1181 case 'W':
1182 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1183 UINT_MAX, &errstr);
1184 if (errstr)
1185 fatal("Desired generator has bad value: %s (%s)",
1186 optarg, errstr);
1187 break;
1188 case 'a':
1189 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1190 if (errstr)
1191 fatal("Invalid number of trials: %s (%s)",
1192 optarg, errstr);
1193 break;
1194 case 'M':
1195 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1196 if (errstr) {
1197 fatal("Memory limit is %s: %s", errstr, optarg);
1198 }
1199 break;
1200 case 'G':
1201 do_gen_candidates = 1;
1202 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1203 sizeof(out_file))
1204 fatal("Output filename too long");
1205 break;
1206 case 'T':
1207 do_screen_candidates = 1;
1208 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1209 sizeof(out_file))
1210 fatal("Output filename too long");
1211 break;
1212 case 'S':
1213 /* XXX - also compare length against bits */
1214 if (BN_hex2bn(&start, optarg) == 0)
1215 fatal("Invalid start point.");
1216 break;
1217 case '?':
1218 default:
1219 usage();
1220 }
1221 }
1222
1223 /* reinit */
1224 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1225
1226 if (optind < ac) {
1227 printf("Too many arguments.\n");
1228 usage();
1229 }
1230 if (change_passphrase && change_comment) {
1231 printf("Can only have one of -p and -c.\n");
1232 usage();
1233 }
1234 if (delete_host || hash_hosts || find_host)
1235 do_known_hosts(pw, rr_hostname);
1236 if (print_fingerprint || print_bubblebabble)
1237 do_fingerprint(pw);
1238 if (change_passphrase)
1239 do_change_passphrase(pw);
1240 if (change_comment)
1241 do_change_comment(pw);
1242 if (convert_to_ssh2)
1243 do_convert_to_ssh2(pw);
1244 if (convert_from_ssh2)
1245 do_convert_from_ssh2(pw);
1246 if (print_public)
1247 do_print_public(pw);
1248 if (rr_hostname != NULL) {
1249 unsigned int n = 0;
1250
1251 if (have_identity) {
1252 n = do_print_resource_record(pw,
1253 identity_file, rr_hostname);
1254 if (n == 0) {
1255 perror(identity_file);
1256 exit(1);
1257 }
1258 exit(0);
1259 } else {
1260
1261 n += do_print_resource_record(pw,
1262 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1263 n += do_print_resource_record(pw,
1264 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1265
1266 if (n == 0)
1267 fatal("no keys found.");
1268 exit(0);
1269 }
1270 }
1271 if (reader_id != NULL) {
1272 #ifdef SMARTCARD
1273 if (download)
1274 do_download(pw, reader_id);
1275 else
1276 do_upload(pw, reader_id);
1277 #else /* SMARTCARD */
1278 fatal("no support for smartcards.");
1279 #endif /* SMARTCARD */
1280 }
1281
1282 if (do_gen_candidates) {
1283 FILE *out = fopen(out_file, "w");
1284
1285 if (out == NULL) {
1286 error("Couldn't open modulus candidate file \"%s\": %s",
1287 out_file, strerror(errno));
1288 return (1);
1289 }
1290 if (bits == 0)
1291 bits = DEFAULT_BITS;
1292 if (gen_candidates(out, memory, bits, start) != 0)
1293 fatal("modulus candidate generation failed");
1294
1295 return (0);
1296 }
1297
1298 if (do_screen_candidates) {
1299 FILE *in;
1300 FILE *out = fopen(out_file, "w");
1301
1302 if (have_identity && strcmp(identity_file, "-") != 0) {
1303 if ((in = fopen(identity_file, "r")) == NULL) {
1304 fatal("Couldn't open modulus candidate "
1305 "file \"%s\": %s", identity_file,
1306 strerror(errno));
1307 }
1308 } else
1309 in = stdin;
1310
1311 if (out == NULL) {
1312 fatal("Couldn't open moduli file \"%s\": %s",
1313 out_file, strerror(errno));
1314 }
1315 if (prime_test(in, out, trials, generator_wanted) != 0)
1316 fatal("modulus screening failed");
1317 return (0);
1318 }
1319
1320 arc4random_stir();
1321
1322 if (key_type_name == NULL)
1323 key_type_name = "rsa";
1324
1325 type = key_type_from_name(key_type_name);
1326 if (type == KEY_UNSPEC) {
1327 fprintf(stderr, "unknown key type %s\n", key_type_name);
1328 exit(1);
1329 }
1330 if (bits == 0)
1331 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1332 if (type == KEY_DSA && bits != 1024)
1333 fatal("DSA keys must be 1024 bits");
1334 if (!quiet)
1335 printf("Generating public/private %s key pair.\n", key_type_name);
1336 private = key_generate(type, bits);
1337 if (private == NULL) {
1338 fprintf(stderr, "key_generate failed");
1339 exit(1);
1340 }
1341 public = key_from_private(private);
1342
1343 if (!have_identity)
1344 ask_filename(pw, "Enter file in which to save the key");
1345
1346 /* Create ~/.ssh directory if it doesn't already exist. */
1347 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1348 if (strstr(identity_file, dotsshdir) != NULL &&
1349 stat(dotsshdir, &st) < 0) {
1350 if (mkdir(dotsshdir, 0700) < 0)
1351 error("Could not create directory '%s'.", dotsshdir);
1352 else if (!quiet)
1353 printf("Created directory '%s'.\n", dotsshdir);
1354 }
1355 /* If the file already exists, ask the user to confirm. */
1356 if (stat(identity_file, &st) >= 0) {
1357 char yesno[3];
1358 printf("%s already exists.\n", identity_file);
1359 printf("Overwrite (y/n)? ");
1360 fflush(stdout);
1361 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1362 exit(1);
1363 if (yesno[0] != 'y' && yesno[0] != 'Y')
1364 exit(1);
1365 }
1366 /* Ask for a passphrase (twice). */
1367 if (identity_passphrase)
1368 passphrase1 = xstrdup(identity_passphrase);
1369 else if (identity_new_passphrase)
1370 passphrase1 = xstrdup(identity_new_passphrase);
1371 else {
1372 passphrase_again:
1373 passphrase1 =
1374 read_passphrase("Enter passphrase (empty for no "
1375 "passphrase): ", RP_ALLOW_STDIN);
1376 passphrase2 = read_passphrase("Enter same passphrase again: ",
1377 RP_ALLOW_STDIN);
1378 if (strcmp(passphrase1, passphrase2) != 0) {
1379 /*
1380 * The passphrases do not match. Clear them and
1381 * retry.
1382 */
1383 memset(passphrase1, 0, strlen(passphrase1));
1384 memset(passphrase2, 0, strlen(passphrase2));
1385 xfree(passphrase1);
1386 xfree(passphrase2);
1387 printf("Passphrases do not match. Try again.\n");
1388 goto passphrase_again;
1389 }
1390 /* Clear the other copy of the passphrase. */
1391 memset(passphrase2, 0, strlen(passphrase2));
1392 xfree(passphrase2);
1393 }
1394
1395 if (identity_comment) {
1396 strlcpy(comment, identity_comment, sizeof(comment));
1397 } else {
1398 /* Create default commend field for the passphrase. */
1399 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1400 }
1401
1402 /* Save the key with the given passphrase and comment. */
1403 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1404 printf("Saving the key failed: %s.\n", identity_file);
1405 memset(passphrase1, 0, strlen(passphrase1));
1406 xfree(passphrase1);
1407 exit(1);
1408 }
1409 /* Clear the passphrase. */
1410 memset(passphrase1, 0, strlen(passphrase1));
1411 xfree(passphrase1);
1412
1413 /* Clear the private key and the random number generator. */
1414 key_free(private);
1415 arc4random_stir();
1416
1417 if (!quiet)
1418 printf("Your identification has been saved in %s.\n", identity_file);
1419
1420 strlcat(identity_file, ".pub", sizeof(identity_file));
1421 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1422 if (fd == -1) {
1423 printf("Could not save your public key in %s\n", identity_file);
1424 exit(1);
1425 }
1426 f = fdopen(fd, "w");
1427 if (f == NULL) {
1428 printf("fdopen %s failed", identity_file);
1429 exit(1);
1430 }
1431 if (!key_write(public, f))
1432 fprintf(stderr, "write key failed");
1433 fprintf(f, " %s\n", comment);
1434 fclose(f);
1435
1436 if (!quiet) {
1437 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1438 printf("Your public key has been saved in %s.\n",
1439 identity_file);
1440 printf("The key fingerprint is:\n");
1441 printf("%s %s\n", fp, comment);
1442 xfree(fp);
1443 }
1444
1445 key_free(public);
1446 exit(0);
1447 }
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