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- dtucker@cvs.openbsd.org 2006/07/19 13:07:10
[openssh-git.git] / ssh-keygen.c
blob56ad725d8607d1c032fe618dec2038f9bf782b4c
1 /* $OpenBSD: ssh-keygen.c,v 1.149 2006/07/17 01:31:10 stevesk 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
21 #include <openssl/evp.h>
22 #include <openssl/pem.h>
23
24 #include <errno.h>
25 #include <fcntl.h>
26 #if defined(HAVE_NETDB_H)
27 # include <netdb.h>
28 #endif
29 #ifdef HAVE_PATHS_H
30 # include <paths.h>
31 #endif
32 #include <pwd.h>
33 #include <unistd.h>
34
35 #include "xmalloc.h"
36 #include "key.h"
37 #include "rsa.h"
38 #include "authfile.h"
39 #include "uuencode.h"
40 #include "buffer.h"
41 #include "bufaux.h"
42 #include "pathnames.h"
43 #include "log.h"
44 #include "misc.h"
45 #include "match.h"
46 #include "hostfile.h"
47 #include "dns.h"
48
49 #ifdef SMARTCARD
50 #include "scard.h"
51 #endif
52
53 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
54 #define DEFAULT_BITS 2048
55 #define DEFAULT_BITS_DSA 1024
56 u_int32_t bits = 0;
57
58 /*
59 * Flag indicating that we just want to change the passphrase. This can be
60 * set on the command line.
61 */
62 int change_passphrase = 0;
63
64 /*
65 * Flag indicating that we just want to change the comment. This can be set
66 * on the command line.
67 */
68 int change_comment = 0;
69
70 int quiet = 0;
71
72 /* Flag indicating that we want to hash a known_hosts file */
73 int hash_hosts = 0;
74 /* Flag indicating that we want lookup a host in known_hosts file */
75 int find_host = 0;
76 /* Flag indicating that we want to delete a host from a known_hosts file */
77 int delete_host = 0;
78
79 /* Flag indicating that we just want to see the key fingerprint */
80 int print_fingerprint = 0;
81 int print_bubblebabble = 0;
82
83 /* The identity file name, given on the command line or entered by the user. */
84 char identity_file[1024];
85 int have_identity = 0;
86
87 /* This is set to the passphrase if given on the command line. */
88 char *identity_passphrase = NULL;
89
90 /* This is set to the new passphrase if given on the command line. */
91 char *identity_new_passphrase = NULL;
92
93 /* This is set to the new comment if given on the command line. */
94 char *identity_comment = NULL;
95
96 /* Dump public key file in format used by real and the original SSH 2 */
97 int convert_to_ssh2 = 0;
98 int convert_from_ssh2 = 0;
99 int print_public = 0;
100 int print_generic = 0;
101
102 char *key_type_name = NULL;
103
104 /* argv0 */
105 extern char *__progname;
106
107 char hostname[MAXHOSTNAMELEN];
108
109 /* moduli.c */
110 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
111 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
112
113 static void
114 ask_filename(struct passwd *pw, const char *prompt)
115 {
116 char buf[1024];
117 char *name = NULL;
118
119 if (key_type_name == NULL)
120 name = _PATH_SSH_CLIENT_ID_RSA;
121 else {
122 switch (key_type_from_name(key_type_name)) {
123 case KEY_RSA1:
124 name = _PATH_SSH_CLIENT_IDENTITY;
125 break;
126 case KEY_DSA:
127 name = _PATH_SSH_CLIENT_ID_DSA;
128 break;
129 case KEY_RSA:
130 name = _PATH_SSH_CLIENT_ID_RSA;
131 break;
132 default:
133 fprintf(stderr, "bad key type");
134 exit(1);
135 break;
136 }
137 }
138 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
139 fprintf(stderr, "%s (%s): ", prompt, identity_file);
140 if (fgets(buf, sizeof(buf), stdin) == NULL)
141 exit(1);
142 if (strchr(buf, '\n'))
143 *strchr(buf, '\n') = 0;
144 if (strcmp(buf, "") != 0)
145 strlcpy(identity_file, buf, sizeof(identity_file));
146 have_identity = 1;
147 }
148
149 static Key *
150 load_identity(char *filename)
151 {
152 char *pass;
153 Key *prv;
154
155 prv = key_load_private(filename, "", NULL);
156 if (prv == NULL) {
157 if (identity_passphrase)
158 pass = xstrdup(identity_passphrase);
159 else
160 pass = read_passphrase("Enter passphrase: ",
161 RP_ALLOW_STDIN);
162 prv = key_load_private(filename, pass, NULL);
163 memset(pass, 0, strlen(pass));
164 xfree(pass);
165 }
166 return prv;
167 }
168
169 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
170 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
171 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
172 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
173
174 static void
175 do_convert_to_ssh2(struct passwd *pw)
176 {
177 Key *k;
178 u_int len;
179 u_char *blob;
180 struct stat st;
181
182 if (!have_identity)
183 ask_filename(pw, "Enter file in which the key is");
184 if (stat(identity_file, &st) < 0) {
185 perror(identity_file);
186 exit(1);
187 }
188 if ((k = key_load_public(identity_file, NULL)) == NULL) {
189 if ((k = load_identity(identity_file)) == NULL) {
190 fprintf(stderr, "load failed\n");
191 exit(1);
192 }
193 }
194 if (k->type == KEY_RSA1) {
195 fprintf(stderr, "version 1 keys are not supported\n");
196 exit(1);
197 }
198 if (key_to_blob(k, &blob, &len) <= 0) {
199 fprintf(stderr, "key_to_blob failed\n");
200 exit(1);
201 }
202 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
203 fprintf(stdout,
204 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
205 key_size(k), key_type(k),
206 pw->pw_name, hostname);
207 dump_base64(stdout, blob, len);
208 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
209 key_free(k);
210 xfree(blob);
211 exit(0);
212 }
213
214 static void
215 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
216 {
217 u_int bignum_bits = buffer_get_int(b);
218 u_int bytes = (bignum_bits + 7) / 8;
219
220 if (buffer_len(b) < bytes)
221 fatal("buffer_get_bignum_bits: input buffer too small: "
222 "need %d have %d", bytes, buffer_len(b));
223 BN_bin2bn(buffer_ptr(b), bytes, value);
224 buffer_consume(b, bytes);
225 }
226
227 static Key *
228 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
229 {
230 Buffer b;
231 Key *key = NULL;
232 char *type, *cipher;
233 u_char *sig, data[] = "abcde12345";
234 int magic, rlen, ktype, i1, i2, i3, i4;
235 u_int slen;
236 u_long e;
237
238 buffer_init(&b);
239 buffer_append(&b, blob, blen);
240
241 magic = buffer_get_int(&b);
242 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
243 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
244 buffer_free(&b);
245 return NULL;
246 }
247 i1 = buffer_get_int(&b);
248 type = buffer_get_string(&b, NULL);
249 cipher = buffer_get_string(&b, NULL);
250 i2 = buffer_get_int(&b);
251 i3 = buffer_get_int(&b);
252 i4 = buffer_get_int(&b);
253 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
254 if (strcmp(cipher, "none") != 0) {
255 error("unsupported cipher %s", cipher);
256 xfree(cipher);
257 buffer_free(&b);
258 xfree(type);
259 return NULL;
260 }
261 xfree(cipher);
262
263 if (strstr(type, "dsa")) {
264 ktype = KEY_DSA;
265 } else if (strstr(type, "rsa")) {
266 ktype = KEY_RSA;
267 } else {
268 buffer_free(&b);
269 xfree(type);
270 return NULL;
271 }
272 key = key_new_private(ktype);
273 xfree(type);
274
275 switch (key->type) {
276 case KEY_DSA:
277 buffer_get_bignum_bits(&b, key->dsa->p);
278 buffer_get_bignum_bits(&b, key->dsa->g);
279 buffer_get_bignum_bits(&b, key->dsa->q);
280 buffer_get_bignum_bits(&b, key->dsa->pub_key);
281 buffer_get_bignum_bits(&b, key->dsa->priv_key);
282 break;
283 case KEY_RSA:
284 e = buffer_get_char(&b);
285 debug("e %lx", e);
286 if (e < 30) {
287 e <<= 8;
288 e += buffer_get_char(&b);
289 debug("e %lx", e);
290 e <<= 8;
291 e += buffer_get_char(&b);
292 debug("e %lx", e);
293 }
294 if (!BN_set_word(key->rsa->e, e)) {
295 buffer_free(&b);
296 key_free(key);
297 return NULL;
298 }
299 buffer_get_bignum_bits(&b, key->rsa->d);
300 buffer_get_bignum_bits(&b, key->rsa->n);
301 buffer_get_bignum_bits(&b, key->rsa->iqmp);
302 buffer_get_bignum_bits(&b, key->rsa->q);
303 buffer_get_bignum_bits(&b, key->rsa->p);
304 rsa_generate_additional_parameters(key->rsa);
305 break;
306 }
307 rlen = buffer_len(&b);
308 if (rlen != 0)
309 error("do_convert_private_ssh2_from_blob: "
310 "remaining bytes in key blob %d", rlen);
311 buffer_free(&b);
312
313 /* try the key */
314 key_sign(key, &sig, &slen, data, sizeof(data));
315 key_verify(key, sig, slen, data, sizeof(data));
316 xfree(sig);
317 return key;
318 }
319
320 static int
321 get_line(FILE *fp, char *line, size_t len)
322 {
323 int c;
324 size_t pos = 0;
325
326 line[0] = '\0';
327 while ((c = fgetc(fp)) != EOF) {
328 if (pos >= len - 1) {
329 fprintf(stderr, "input line too long.\n");
330 exit(1);
331 }
332 switch (c) {
333 case '\r':
334 c = fgetc(fp);
335 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
336 fprintf(stderr, "unget: %s\n", strerror(errno));
337 exit(1);
338 }
339 return pos;
340 case '\n':
341 return pos;
342 }
343 line[pos++] = c;
344 line[pos] = '\0';
345 }
346 if (c == EOF)
347 return -1;
348 return pos;
349 }
350
351 static void
352 do_convert_from_ssh2(struct passwd *pw)
353 {
354 Key *k;
355 int blen;
356 u_int len;
357 char line[1024];
358 u_char blob[8096];
359 char encoded[8096];
360 struct stat st;
361 int escaped = 0, private = 0, ok;
362 FILE *fp;
363
364 if (!have_identity)
365 ask_filename(pw, "Enter file in which the key is");
366 if (stat(identity_file, &st) < 0) {
367 perror(identity_file);
368 exit(1);
369 }
370 fp = fopen(identity_file, "r");
371 if (fp == NULL) {
372 perror(identity_file);
373 exit(1);
374 }
375 encoded[0] = '\0';
376 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
377 if (line[blen - 1] == '\\')
378 escaped++;
379 if (strncmp(line, "----", 4) == 0 ||
380 strstr(line, ": ") != NULL) {
381 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
382 private = 1;
383 if (strstr(line, " END ") != NULL) {
384 break;
385 }
386 /* fprintf(stderr, "ignore: %s", line); */
387 continue;
388 }
389 if (escaped) {
390 escaped--;
391 /* fprintf(stderr, "escaped: %s", line); */
392 continue;
393 }
394 strlcat(encoded, line, sizeof(encoded));
395 }
396 len = strlen(encoded);
397 if (((len % 4) == 3) &&
398 (encoded[len-1] == '=') &&
399 (encoded[len-2] == '=') &&
400 (encoded[len-3] == '='))
401 encoded[len-3] = '\0';
402 blen = uudecode(encoded, blob, sizeof(blob));
403 if (blen < 0) {
404 fprintf(stderr, "uudecode failed.\n");
405 exit(1);
406 }
407 k = private ?
408 do_convert_private_ssh2_from_blob(blob, blen) :
409 key_from_blob(blob, blen);
410 if (k == NULL) {
411 fprintf(stderr, "decode blob failed.\n");
412 exit(1);
413 }
414 ok = private ?
415 (k->type == KEY_DSA ?
416 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
417 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
418 key_write(k, stdout);
419 if (!ok) {
420 fprintf(stderr, "key write failed");
421 exit(1);
422 }
423 key_free(k);
424 if (!private)
425 fprintf(stdout, "\n");
426 fclose(fp);
427 exit(0);
428 }
429
430 static void
431 do_print_public(struct passwd *pw)
432 {
433 Key *prv;
434 struct stat st;
435
436 if (!have_identity)
437 ask_filename(pw, "Enter file in which the key is");
438 if (stat(identity_file, &st) < 0) {
439 perror(identity_file);
440 exit(1);
441 }
442 prv = load_identity(identity_file);
443 if (prv == NULL) {
444 fprintf(stderr, "load failed\n");
445 exit(1);
446 }
447 if (!key_write(prv, stdout))
448 fprintf(stderr, "key_write failed");
449 key_free(prv);
450 fprintf(stdout, "\n");
451 exit(0);
452 }
453
454 #ifdef SMARTCARD
455 static void
456 do_upload(struct passwd *pw, const char *sc_reader_id)
457 {
458 Key *prv = NULL;
459 struct stat st;
460 int ret;
461
462 if (!have_identity)
463 ask_filename(pw, "Enter file in which the key is");
464 if (stat(identity_file, &st) < 0) {
465 perror(identity_file);
466 exit(1);
467 }
468 prv = load_identity(identity_file);
469 if (prv == NULL) {
470 error("load failed");
471 exit(1);
472 }
473 ret = sc_put_key(prv, sc_reader_id);
474 key_free(prv);
475 if (ret < 0)
476 exit(1);
477 logit("loading key done");
478 exit(0);
479 }
480
481 static void
482 do_download(struct passwd *pw, const char *sc_reader_id)
483 {
484 Key **keys = NULL;
485 int i;
486
487 keys = sc_get_keys(sc_reader_id, NULL);
488 if (keys == NULL)
489 fatal("cannot read public key from smartcard");
490 for (i = 0; keys[i]; i++) {
491 key_write(keys[i], stdout);
492 key_free(keys[i]);
493 fprintf(stdout, "\n");
494 }
495 xfree(keys);
496 exit(0);
497 }
498 #endif /* SMARTCARD */
499
500 static void
501 do_fingerprint(struct passwd *pw)
502 {
503 FILE *f;
504 Key *public;
505 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
506 int i, skip = 0, num = 1, invalid = 1;
507 enum fp_rep rep;
508 enum fp_type fptype;
509 struct stat st;
510
511 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
512 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
513
514 if (!have_identity)
515 ask_filename(pw, "Enter file in which the key is");
516 if (stat(identity_file, &st) < 0) {
517 perror(identity_file);
518 exit(1);
519 }
520 public = key_load_public(identity_file, &comment);
521 if (public != NULL) {
522 fp = key_fingerprint(public, fptype, rep);
523 printf("%u %s %s\n", key_size(public), fp, comment);
524 key_free(public);
525 xfree(comment);
526 xfree(fp);
527 exit(0);
528 }
529 if (comment) {
530 xfree(comment);
531 comment = NULL;
532 }
533
534 f = fopen(identity_file, "r");
535 if (f != NULL) {
536 while (fgets(line, sizeof(line), f)) {
537 i = strlen(line) - 1;
538 if (line[i] != '\n') {
539 error("line %d too long: %.40s...", num, line);
540 skip = 1;
541 continue;
542 }
543 num++;
544 if (skip) {
545 skip = 0;
546 continue;
547 }
548 line[i] = '\0';
549
550 /* Skip leading whitespace, empty and comment lines. */
551 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
552 ;
553 if (!*cp || *cp == '\n' || *cp == '#')
554 continue ;
555 i = strtol(cp, &ep, 10);
556 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
557 int quoted = 0;
558 comment = cp;
559 for (; *cp && (quoted || (*cp != ' ' &&
560 *cp != '\t')); cp++) {
561 if (*cp == '\\' && cp[1] == '"')
562 cp++; /* Skip both */
563 else if (*cp == '"')
564 quoted = !quoted;
565 }
566 if (!*cp)
567 continue;
568 *cp++ = '\0';
569 }
570 ep = cp;
571 public = key_new(KEY_RSA1);
572 if (key_read(public, &cp) != 1) {
573 cp = ep;
574 key_free(public);
575 public = key_new(KEY_UNSPEC);
576 if (key_read(public, &cp) != 1) {
577 key_free(public);
578 continue;
579 }
580 }
581 comment = *cp ? cp : comment;
582 fp = key_fingerprint(public, fptype, rep);
583 printf("%u %s %s\n", key_size(public), fp,
584 comment ? comment : "no comment");
585 xfree(fp);
586 key_free(public);
587 invalid = 0;
588 }
589 fclose(f);
590 }
591 if (invalid) {
592 printf("%s is not a public key file.\n", identity_file);
593 exit(1);
594 }
595 exit(0);
596 }
597
598 static void
599 print_host(FILE *f, char *name, Key *public, int hash)
600 {
601 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
602 fatal("hash_host failed");
603 fprintf(f, "%s ", name);
604 if (!key_write(public, f))
605 fatal("key_write failed");
606 fprintf(f, "\n");
607 }
608
609 static void
610 do_known_hosts(struct passwd *pw, const char *name)
611 {
612 FILE *in, *out = stdout;
613 Key *public;
614 char *cp, *cp2, *kp, *kp2;
615 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
616 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
617
618 if (!have_identity) {
619 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
620 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
621 sizeof(identity_file))
622 fatal("Specified known hosts path too long");
623 xfree(cp);
624 have_identity = 1;
625 }
626 if ((in = fopen(identity_file, "r")) == NULL)
627 fatal("fopen: %s", strerror(errno));
628
629 /*
630 * Find hosts goes to stdout, hash and deletions happen in-place
631 * A corner case is ssh-keygen -HF foo, which should go to stdout
632 */
633 if (!find_host && (hash_hosts || delete_host)) {
634 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
635 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
636 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
637 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
638 fatal("known_hosts path too long");
639 umask(077);
640 if ((c = mkstemp(tmp)) == -1)
641 fatal("mkstemp: %s", strerror(errno));
642 if ((out = fdopen(c, "w")) == NULL) {
643 c = errno;
644 unlink(tmp);
645 fatal("fdopen: %s", strerror(c));
646 }
647 inplace = 1;
648 }
649
650 while (fgets(line, sizeof(line), in)) {
651 num++;
652 i = strlen(line) - 1;
653 if (line[i] != '\n') {
654 error("line %d too long: %.40s...", num, line);
655 skip = 1;
656 invalid = 1;
657 continue;
658 }
659 if (skip) {
660 skip = 0;
661 continue;
662 }
663 line[i] = '\0';
664
665 /* Skip leading whitespace, empty and comment lines. */
666 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
667 ;
668 if (!*cp || *cp == '\n' || *cp == '#') {
669 if (inplace)
670 fprintf(out, "%s\n", cp);
671 continue;
672 }
673 /* Find the end of the host name portion. */
674 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
675 ;
676 if (*kp == '\0' || *(kp + 1) == '\0') {
677 error("line %d missing key: %.40s...",
678 num, line);
679 invalid = 1;
680 continue;
681 }
682 *kp++ = '\0';
683 kp2 = kp;
684
685 public = key_new(KEY_RSA1);
686 if (key_read(public, &kp) != 1) {
687 kp = kp2;
688 key_free(public);
689 public = key_new(KEY_UNSPEC);
690 if (key_read(public, &kp) != 1) {
691 error("line %d invalid key: %.40s...",
692 num, line);
693 key_free(public);
694 invalid = 1;
695 continue;
696 }
697 }
698
699 if (*cp == HASH_DELIM) {
700 if (find_host || delete_host) {
701 cp2 = host_hash(name, cp, strlen(cp));
702 if (cp2 == NULL) {
703 error("line %d: invalid hashed "
704 "name: %.64s...", num, line);
705 invalid = 1;
706 continue;
707 }
708 c = (strcmp(cp2, cp) == 0);
709 if (find_host && c) {
710 printf("# Host %s found: "
711 "line %d type %s\n", name,
712 num, key_type(public));
713 print_host(out, cp, public, 0);
714 }
715 if (delete_host && !c)
716 print_host(out, cp, public, 0);
717 } else if (hash_hosts)
718 print_host(out, cp, public, 0);
719 } else {
720 if (find_host || delete_host) {
721 c = (match_hostname(name, cp,
722 strlen(cp)) == 1);
723 if (find_host && c) {
724 printf("# Host %s found: "
725 "line %d type %s\n", name,
726 num, key_type(public));
727 print_host(out, cp, public, hash_hosts);
728 }
729 if (delete_host && !c)
730 print_host(out, cp, public, 0);
731 } else if (hash_hosts) {
732 for (cp2 = strsep(&cp, ",");
733 cp2 != NULL && *cp2 != '\0';
734 cp2 = strsep(&cp, ",")) {
735 if (strcspn(cp2, "*?!") != strlen(cp2))
736 fprintf(stderr, "Warning: "
737 "ignoring host name with "
738 "metacharacters: %.64s\n",
739 cp2);
740 else
741 print_host(out, cp2, public, 1);
742 }
743 has_unhashed = 1;
744 }
745 }
746 key_free(public);
747 }
748 fclose(in);
749
750 if (invalid) {
751 fprintf(stderr, "%s is not a valid known_host file.\n",
752 identity_file);
753 if (inplace) {
754 fprintf(stderr, "Not replacing existing known_hosts "
755 "file because of errors\n");
756 fclose(out);
757 unlink(tmp);
758 }
759 exit(1);
760 }
761
762 if (inplace) {
763 fclose(out);
764
765 /* Backup existing file */
766 if (unlink(old) == -1 && errno != ENOENT)
767 fatal("unlink %.100s: %s", old, strerror(errno));
768 if (link(identity_file, old) == -1)
769 fatal("link %.100s to %.100s: %s", identity_file, old,
770 strerror(errno));
771 /* Move new one into place */
772 if (rename(tmp, identity_file) == -1) {
773 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
774 strerror(errno));
775 unlink(tmp);
776 unlink(old);
777 exit(1);
778 }
779
780 fprintf(stderr, "%s updated.\n", identity_file);
781 fprintf(stderr, "Original contents retained as %s\n", old);
782 if (has_unhashed) {
783 fprintf(stderr, "WARNING: %s contains unhashed "
784 "entries\n", old);
785 fprintf(stderr, "Delete this file to ensure privacy "
786 "of hostnames\n");
787 }
788 }
789
790 exit(0);
791 }
792
793 /*
794 * Perform changing a passphrase. The argument is the passwd structure
795 * for the current user.
796 */
797 static void
798 do_change_passphrase(struct passwd *pw)
799 {
800 char *comment;
801 char *old_passphrase, *passphrase1, *passphrase2;
802 struct stat st;
803 Key *private;
804
805 if (!have_identity)
806 ask_filename(pw, "Enter file in which the key is");
807 if (stat(identity_file, &st) < 0) {
808 perror(identity_file);
809 exit(1);
810 }
811 /* Try to load the file with empty passphrase. */
812 private = key_load_private(identity_file, "", &comment);
813 if (private == NULL) {
814 if (identity_passphrase)
815 old_passphrase = xstrdup(identity_passphrase);
816 else
817 old_passphrase =
818 read_passphrase("Enter old passphrase: ",
819 RP_ALLOW_STDIN);
820 private = key_load_private(identity_file, old_passphrase,
821 &comment);
822 memset(old_passphrase, 0, strlen(old_passphrase));
823 xfree(old_passphrase);
824 if (private == NULL) {
825 printf("Bad passphrase.\n");
826 exit(1);
827 }
828 }
829 printf("Key has comment '%s'\n", comment);
830
831 /* Ask the new passphrase (twice). */
832 if (identity_new_passphrase) {
833 passphrase1 = xstrdup(identity_new_passphrase);
834 passphrase2 = NULL;
835 } else {
836 passphrase1 =
837 read_passphrase("Enter new passphrase (empty for no "
838 "passphrase): ", RP_ALLOW_STDIN);
839 passphrase2 = read_passphrase("Enter same passphrase again: ",
840 RP_ALLOW_STDIN);
841
842 /* Verify that they are the same. */
843 if (strcmp(passphrase1, passphrase2) != 0) {
844 memset(passphrase1, 0, strlen(passphrase1));
845 memset(passphrase2, 0, strlen(passphrase2));
846 xfree(passphrase1);
847 xfree(passphrase2);
848 printf("Pass phrases do not match. Try again.\n");
849 exit(1);
850 }
851 /* Destroy the other copy. */
852 memset(passphrase2, 0, strlen(passphrase2));
853 xfree(passphrase2);
854 }
855
856 /* Save the file using the new passphrase. */
857 if (!key_save_private(private, identity_file, passphrase1, comment)) {
858 printf("Saving the key failed: %s.\n", identity_file);
859 memset(passphrase1, 0, strlen(passphrase1));
860 xfree(passphrase1);
861 key_free(private);
862 xfree(comment);
863 exit(1);
864 }
865 /* Destroy the passphrase and the copy of the key in memory. */
866 memset(passphrase1, 0, strlen(passphrase1));
867 xfree(passphrase1);
868 key_free(private); /* Destroys contents */
869 xfree(comment);
870
871 printf("Your identification has been saved with the new passphrase.\n");
872 exit(0);
873 }
874
875 /*
876 * Print the SSHFP RR.
877 */
878 static int
879 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
880 {
881 Key *public;
882 char *comment = NULL;
883 struct stat st;
884
885 if (fname == NULL)
886 ask_filename(pw, "Enter file in which the key is");
887 if (stat(fname, &st) < 0) {
888 if (errno == ENOENT)
889 return 0;
890 perror(fname);
891 exit(1);
892 }
893 public = key_load_public(fname, &comment);
894 if (public != NULL) {
895 export_dns_rr(hname, public, stdout, print_generic);
896 key_free(public);
897 xfree(comment);
898 return 1;
899 }
900 if (comment)
901 xfree(comment);
902
903 printf("failed to read v2 public key from %s.\n", fname);
904 exit(1);
905 }
906
907 /*
908 * Change the comment of a private key file.
909 */
910 static void
911 do_change_comment(struct passwd *pw)
912 {
913 char new_comment[1024], *comment, *passphrase;
914 Key *private;
915 Key *public;
916 struct stat st;
917 FILE *f;
918 int fd;
919
920 if (!have_identity)
921 ask_filename(pw, "Enter file in which the key is");
922 if (stat(identity_file, &st) < 0) {
923 perror(identity_file);
924 exit(1);
925 }
926 private = key_load_private(identity_file, "", &comment);
927 if (private == NULL) {
928 if (identity_passphrase)
929 passphrase = xstrdup(identity_passphrase);
930 else if (identity_new_passphrase)
931 passphrase = xstrdup(identity_new_passphrase);
932 else
933 passphrase = read_passphrase("Enter passphrase: ",
934 RP_ALLOW_STDIN);
935 /* Try to load using the passphrase. */
936 private = key_load_private(identity_file, passphrase, &comment);
937 if (private == NULL) {
938 memset(passphrase, 0, strlen(passphrase));
939 xfree(passphrase);
940 printf("Bad passphrase.\n");
941 exit(1);
942 }
943 } else {
944 passphrase = xstrdup("");
945 }
946 if (private->type != KEY_RSA1) {
947 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
948 key_free(private);
949 exit(1);
950 }
951 printf("Key now has comment '%s'\n", comment);
952
953 if (identity_comment) {
954 strlcpy(new_comment, identity_comment, sizeof(new_comment));
955 } else {
956 printf("Enter new comment: ");
957 fflush(stdout);
958 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
959 memset(passphrase, 0, strlen(passphrase));
960 key_free(private);
961 exit(1);
962 }
963 if (strchr(new_comment, '\n'))
964 *strchr(new_comment, '\n') = 0;
965 }
966
967 /* Save the file using the new passphrase. */
968 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
969 printf("Saving the key failed: %s.\n", identity_file);
970 memset(passphrase, 0, strlen(passphrase));
971 xfree(passphrase);
972 key_free(private);
973 xfree(comment);
974 exit(1);
975 }
976 memset(passphrase, 0, strlen(passphrase));
977 xfree(passphrase);
978 public = key_from_private(private);
979 key_free(private);
980
981 strlcat(identity_file, ".pub", sizeof(identity_file));
982 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
983 if (fd == -1) {
984 printf("Could not save your public key in %s\n", identity_file);
985 exit(1);
986 }
987 f = fdopen(fd, "w");
988 if (f == NULL) {
989 printf("fdopen %s failed", identity_file);
990 exit(1);
991 }
992 if (!key_write(public, f))
993 fprintf(stderr, "write key failed");
994 key_free(public);
995 fprintf(f, " %s\n", new_comment);
996 fclose(f);
997
998 xfree(comment);
999
1000 printf("The comment in your key file has been changed.\n");
1001 exit(0);
1002 }
1003
1004 static void
1005 usage(void)
1006 {
1007 fprintf(stderr, "Usage: %s [options]\n", __progname);
1008 fprintf(stderr, "Options:\n");
1009 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1010 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1011 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1012 fprintf(stderr, " -C comment Provide new comment.\n");
1013 fprintf(stderr, " -c Change comment in private and public key files.\n");
1014 #ifdef SMARTCARD
1015 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1016 #endif /* SMARTCARD */
1017 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
1018 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1019 fprintf(stderr, " -f filename Filename of the key file.\n");
1020 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1021 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1022 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1023 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
1024 fprintf(stderr, " -l Show fingerprint of key file.\n");
1025 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1026 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1027 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1028 fprintf(stderr, " -p Change passphrase of private key file.\n");
1029 fprintf(stderr, " -q Quiet.\n");
1030 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1031 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1032 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1033 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1034 fprintf(stderr, " -t type Specify type of key to create.\n");
1035 #ifdef SMARTCARD
1036 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1037 #endif /* SMARTCARD */
1038 fprintf(stderr, " -v Verbose.\n");
1039 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1040 fprintf(stderr, " -y Read private key file and print public key.\n");
1041
1042 exit(1);
1043 }
1044
1045 /*
1046 * Main program for key management.
1047 */
1048 int
1049 main(int ac, char **av)
1050 {
1051 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1052 char out_file[MAXPATHLEN], *reader_id = NULL;
1053 char *rr_hostname = NULL;
1054 Key *private, *public;
1055 struct passwd *pw;
1056 struct stat st;
1057 int opt, type, fd, download = 0;
1058 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1059 int do_gen_candidates = 0, do_screen_candidates = 0;
1060 int log_level = SYSLOG_LEVEL_INFO;
1061 BIGNUM *start = NULL;
1062 FILE *f;
1063 const char *errstr;
1064
1065 extern int optind;
1066 extern char *optarg;
1067
1068 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1069 sanitise_stdfd();
1070
1071 __progname = ssh_get_progname(av[0]);
1072
1073 SSLeay_add_all_algorithms();
1074 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1075
1076 init_rng();
1077 seed_rng();
1078
1079 /* we need this for the home * directory. */
1080 pw = getpwuid(getuid());
1081 if (!pw) {
1082 printf("You don't exist, go away!\n");
1083 exit(1);
1084 }
1085 if (gethostname(hostname, sizeof(hostname)) < 0) {
1086 perror("gethostname");
1087 exit(1);
1088 }
1089
1090 while ((opt = getopt(ac, av,
1091 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1092 switch (opt) {
1093 case 'b':
1094 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1095 if (errstr)
1096 fatal("Bits has bad value %s (%s)",
1097 optarg, errstr);
1098 break;
1099 case 'F':
1100 find_host = 1;
1101 rr_hostname = optarg;
1102 break;
1103 case 'H':
1104 hash_hosts = 1;
1105 break;
1106 case 'R':
1107 delete_host = 1;
1108 rr_hostname = optarg;
1109 break;
1110 case 'l':
1111 print_fingerprint = 1;
1112 break;
1113 case 'B':
1114 print_bubblebabble = 1;
1115 break;
1116 case 'p':
1117 change_passphrase = 1;
1118 break;
1119 case 'c':
1120 change_comment = 1;
1121 break;
1122 case 'f':
1123 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1124 sizeof(identity_file))
1125 fatal("Identity filename too long");
1126 have_identity = 1;
1127 break;
1128 case 'g':
1129 print_generic = 1;
1130 break;
1131 case 'P':
1132 identity_passphrase = optarg;
1133 break;
1134 case 'N':
1135 identity_new_passphrase = optarg;
1136 break;
1137 case 'C':
1138 identity_comment = optarg;
1139 break;
1140 case 'q':
1141 quiet = 1;
1142 break;
1143 case 'e':
1144 case 'x':
1145 /* export key */
1146 convert_to_ssh2 = 1;
1147 break;
1148 case 'i':
1149 case 'X':
1150 /* import key */
1151 convert_from_ssh2 = 1;
1152 break;
1153 case 'y':
1154 print_public = 1;
1155 break;
1156 case 'd':
1157 key_type_name = "dsa";
1158 break;
1159 case 't':
1160 key_type_name = optarg;
1161 break;
1162 case 'D':
1163 download = 1;
1164 /*FALLTHROUGH*/
1165 case 'U':
1166 reader_id = optarg;
1167 break;
1168 case 'v':
1169 if (log_level == SYSLOG_LEVEL_INFO)
1170 log_level = SYSLOG_LEVEL_DEBUG1;
1171 else {
1172 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1173 log_level < SYSLOG_LEVEL_DEBUG3)
1174 log_level++;
1175 }
1176 break;
1177 case 'r':
1178 rr_hostname = optarg;
1179 break;
1180 case 'W':
1181 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1182 UINT_MAX, &errstr);
1183 if (errstr)
1184 fatal("Desired generator has bad value: %s (%s)",
1185 optarg, errstr);
1186 break;
1187 case 'a':
1188 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1189 if (errstr)
1190 fatal("Invalid number of trials: %s (%s)",
1191 optarg, errstr);
1192 break;
1193 case 'M':
1194 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1195 if (errstr) {
1196 fatal("Memory limit is %s: %s", errstr, optarg);
1197 }
1198 break;
1199 case 'G':
1200 do_gen_candidates = 1;
1201 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1202 sizeof(out_file))
1203 fatal("Output filename too long");
1204 break;
1205 case 'T':
1206 do_screen_candidates = 1;
1207 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1208 sizeof(out_file))
1209 fatal("Output filename too long");
1210 break;
1211 case 'S':
1212 /* XXX - also compare length against bits */
1213 if (BN_hex2bn(&start, optarg) == 0)
1214 fatal("Invalid start point.");
1215 break;
1216 case '?':
1217 default:
1218 usage();
1219 }
1220 }
1221
1222 /* reinit */
1223 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1224
1225 if (optind < ac) {
1226 printf("Too many arguments.\n");
1227 usage();
1228 }
1229 if (change_passphrase && change_comment) {
1230 printf("Can only have one of -p and -c.\n");
1231 usage();
1232 }
1233 if (delete_host || hash_hosts || find_host)
1234 do_known_hosts(pw, rr_hostname);
1235 if (print_fingerprint || print_bubblebabble)
1236 do_fingerprint(pw);
1237 if (change_passphrase)
1238 do_change_passphrase(pw);
1239 if (change_comment)
1240 do_change_comment(pw);
1241 if (convert_to_ssh2)
1242 do_convert_to_ssh2(pw);
1243 if (convert_from_ssh2)
1244 do_convert_from_ssh2(pw);
1245 if (print_public)
1246 do_print_public(pw);
1247 if (rr_hostname != NULL) {
1248 unsigned int n = 0;
1249
1250 if (have_identity) {
1251 n = do_print_resource_record(pw,
1252 identity_file, rr_hostname);
1253 if (n == 0) {
1254 perror(identity_file);
1255 exit(1);
1256 }
1257 exit(0);
1258 } else {
1259
1260 n += do_print_resource_record(pw,
1261 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1262 n += do_print_resource_record(pw,
1263 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1264
1265 if (n == 0)
1266 fatal("no keys found.");
1267 exit(0);
1268 }
1269 }
1270 if (reader_id != NULL) {
1271 #ifdef SMARTCARD
1272 if (download)
1273 do_download(pw, reader_id);
1274 else
1275 do_upload(pw, reader_id);
1276 #else /* SMARTCARD */
1277 fatal("no support for smartcards.");
1278 #endif /* SMARTCARD */
1279 }
1280
1281 if (do_gen_candidates) {
1282 FILE *out = fopen(out_file, "w");
1283
1284 if (out == NULL) {
1285 error("Couldn't open modulus candidate file \"%s\": %s",
1286 out_file, strerror(errno));
1287 return (1);
1288 }
1289 if (bits == 0)
1290 bits = DEFAULT_BITS;
1291 if (gen_candidates(out, memory, bits, start) != 0)
1292 fatal("modulus candidate generation failed");
1293
1294 return (0);
1295 }
1296
1297 if (do_screen_candidates) {
1298 FILE *in;
1299 FILE *out = fopen(out_file, "w");
1300
1301 if (have_identity && strcmp(identity_file, "-") != 0) {
1302 if ((in = fopen(identity_file, "r")) == NULL) {
1303 fatal("Couldn't open modulus candidate "
1304 "file \"%s\": %s", identity_file,
1305 strerror(errno));
1306 }
1307 } else
1308 in = stdin;
1309
1310 if (out == NULL) {
1311 fatal("Couldn't open moduli file \"%s\": %s",
1312 out_file, strerror(errno));
1313 }
1314 if (prime_test(in, out, trials, generator_wanted) != 0)
1315 fatal("modulus screening failed");
1316 return (0);
1317 }
1318
1319 arc4random_stir();
1320
1321 if (key_type_name == NULL)
1322 key_type_name = "rsa";
1323
1324 type = key_type_from_name(key_type_name);
1325 if (type == KEY_UNSPEC) {
1326 fprintf(stderr, "unknown key type %s\n", key_type_name);
1327 exit(1);
1328 }
1329 if (bits == 0)
1330 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1331 if (type == KEY_DSA && bits != 1024)
1332 fatal("DSA keys must be 1024 bits");
1333 if (!quiet)
1334 printf("Generating public/private %s key pair.\n", key_type_name);
1335 private = key_generate(type, bits);
1336 if (private == NULL) {
1337 fprintf(stderr, "key_generate failed");
1338 exit(1);
1339 }
1340 public = key_from_private(private);
1341
1342 if (!have_identity)
1343 ask_filename(pw, "Enter file in which to save the key");
1344
1345 /* Create ~/.ssh directory if it doesn't already exist. */
1346 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1347 if (strstr(identity_file, dotsshdir) != NULL &&
1348 stat(dotsshdir, &st) < 0) {
1349 if (mkdir(dotsshdir, 0700) < 0)
1350 error("Could not create directory '%s'.", dotsshdir);
1351 else if (!quiet)
1352 printf("Created directory '%s'.\n", dotsshdir);
1353 }
1354 /* If the file already exists, ask the user to confirm. */
1355 if (stat(identity_file, &st) >= 0) {
1356 char yesno[3];
1357 printf("%s already exists.\n", identity_file);
1358 printf("Overwrite (y/n)? ");
1359 fflush(stdout);
1360 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1361 exit(1);
1362 if (yesno[0] != 'y' && yesno[0] != 'Y')
1363 exit(1);
1364 }
1365 /* Ask for a passphrase (twice). */
1366 if (identity_passphrase)
1367 passphrase1 = xstrdup(identity_passphrase);
1368 else if (identity_new_passphrase)
1369 passphrase1 = xstrdup(identity_new_passphrase);
1370 else {
1371 passphrase_again:
1372 passphrase1 =
1373 read_passphrase("Enter passphrase (empty for no "
1374 "passphrase): ", RP_ALLOW_STDIN);
1375 passphrase2 = read_passphrase("Enter same passphrase again: ",
1376 RP_ALLOW_STDIN);
1377 if (strcmp(passphrase1, passphrase2) != 0) {
1378 /*
1379 * The passphrases do not match. Clear them and
1380 * retry.
1381 */
1382 memset(passphrase1, 0, strlen(passphrase1));
1383 memset(passphrase2, 0, strlen(passphrase2));
1384 xfree(passphrase1);
1385 xfree(passphrase2);
1386 printf("Passphrases do not match. Try again.\n");
1387 goto passphrase_again;
1388 }
1389 /* Clear the other copy of the passphrase. */
1390 memset(passphrase2, 0, strlen(passphrase2));
1391 xfree(passphrase2);
1392 }
1393
1394 if (identity_comment) {
1395 strlcpy(comment, identity_comment, sizeof(comment));
1396 } else {
1397 /* Create default commend field for the passphrase. */
1398 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1399 }
1400
1401 /* Save the key with the given passphrase and comment. */
1402 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1403 printf("Saving the key failed: %s.\n", identity_file);
1404 memset(passphrase1, 0, strlen(passphrase1));
1405 xfree(passphrase1);
1406 exit(1);
1407 }
1408 /* Clear the passphrase. */
1409 memset(passphrase1, 0, strlen(passphrase1));
1410 xfree(passphrase1);
1411
1412 /* Clear the private key and the random number generator. */
1413 key_free(private);
1414 arc4random_stir();
1415
1416 if (!quiet)
1417 printf("Your identification has been saved in %s.\n", identity_file);
1418
1419 strlcat(identity_file, ".pub", sizeof(identity_file));
1420 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1421 if (fd == -1) {
1422 printf("Could not save your public key in %s\n", identity_file);
1423 exit(1);
1424 }
1425 f = fdopen(fd, "w");
1426 if (f == NULL) {
1427 printf("fdopen %s failed", identity_file);
1428 exit(1);
1429 }
1430 if (!key_write(public, f))
1431 fprintf(stderr, "write key failed");
1432 fprintf(f, " %s\n", comment);
1433 fclose(f);
1434
1435 if (!quiet) {
1436 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1437 printf("Your public key has been saved in %s.\n",
1438 identity_file);
1439 printf("The key fingerprint is:\n");
1440 printf("%s %s\n", fp, comment);
1441 xfree(fp);
1442 }
1443
1444 key_free(public);
1445 exit(0);
1446 }
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