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- stevesk@cvs.openbsd.org 2006/07/25 02:01:34
[openssh-git.git] / ssh-keygen.c
blob17236a55aaba193379c0ef184e58f3e9e245afc8
1 /* $OpenBSD: ssh-keygen.c,v 1.150 2006/07/22 20:48:23 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 #include <netdb.h>
27 #ifdef HAVE_PATHS_H
28 # include <paths.h>
29 #endif
30 #include <pwd.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include "xmalloc.h"
35 #include "key.h"
36 #include "rsa.h"
37 #include "authfile.h"
38 #include "uuencode.h"
39 #include "buffer.h"
40 #include "bufaux.h"
41 #include "pathnames.h"
42 #include "log.h"
43 #include "misc.h"
44 #include "match.h"
45 #include "hostfile.h"
46 #include "dns.h"
47
48 #ifdef SMARTCARD
49 #include "scard.h"
50 #endif
51
52 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
53 #define DEFAULT_BITS 2048
54 #define DEFAULT_BITS_DSA 1024
55 u_int32_t bits = 0;
56
57 /*
58 * Flag indicating that we just want to change the passphrase. This can be
59 * set on the command line.
60 */
61 int change_passphrase = 0;
62
63 /*
64 * Flag indicating that we just want to change the comment. This can be set
65 * on the command line.
66 */
67 int change_comment = 0;
68
69 int quiet = 0;
70
71 /* Flag indicating that we want to hash a known_hosts file */
72 int hash_hosts = 0;
73 /* Flag indicating that we want lookup a host in known_hosts file */
74 int find_host = 0;
75 /* Flag indicating that we want to delete a host from a known_hosts file */
76 int delete_host = 0;
77
78 /* Flag indicating that we just want to see the key fingerprint */
79 int print_fingerprint = 0;
80 int print_bubblebabble = 0;
81
82 /* The identity file name, given on the command line or entered by the user. */
83 char identity_file[1024];
84 int have_identity = 0;
85
86 /* This is set to the passphrase if given on the command line. */
87 char *identity_passphrase = NULL;
88
89 /* This is set to the new passphrase if given on the command line. */
90 char *identity_new_passphrase = NULL;
91
92 /* This is set to the new comment if given on the command line. */
93 char *identity_comment = NULL;
94
95 /* Dump public key file in format used by real and the original SSH 2 */
96 int convert_to_ssh2 = 0;
97 int convert_from_ssh2 = 0;
98 int print_public = 0;
99 int print_generic = 0;
100
101 char *key_type_name = NULL;
102
103 /* argv0 */
104 extern char *__progname;
105
106 char hostname[MAXHOSTNAMELEN];
107
108 /* moduli.c */
109 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
110 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
111
112 static void
113 ask_filename(struct passwd *pw, const char *prompt)
114 {
115 char buf[1024];
116 char *name = NULL;
117
118 if (key_type_name == NULL)
119 name = _PATH_SSH_CLIENT_ID_RSA;
120 else {
121 switch (key_type_from_name(key_type_name)) {
122 case KEY_RSA1:
123 name = _PATH_SSH_CLIENT_IDENTITY;
124 break;
125 case KEY_DSA:
126 name = _PATH_SSH_CLIENT_ID_DSA;
127 break;
128 case KEY_RSA:
129 name = _PATH_SSH_CLIENT_ID_RSA;
130 break;
131 default:
132 fprintf(stderr, "bad key type");
133 exit(1);
134 break;
135 }
136 }
137 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
138 fprintf(stderr, "%s (%s): ", prompt, identity_file);
139 if (fgets(buf, sizeof(buf), stdin) == NULL)
140 exit(1);
141 if (strchr(buf, '\n'))
142 *strchr(buf, '\n') = 0;
143 if (strcmp(buf, "") != 0)
144 strlcpy(identity_file, buf, sizeof(identity_file));
145 have_identity = 1;
146 }
147
148 static Key *
149 load_identity(char *filename)
150 {
151 char *pass;
152 Key *prv;
153
154 prv = key_load_private(filename, "", NULL);
155 if (prv == NULL) {
156 if (identity_passphrase)
157 pass = xstrdup(identity_passphrase);
158 else
159 pass = read_passphrase("Enter passphrase: ",
160 RP_ALLOW_STDIN);
161 prv = key_load_private(filename, pass, NULL);
162 memset(pass, 0, strlen(pass));
163 xfree(pass);
164 }
165 return prv;
166 }
167
168 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
169 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
170 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
171 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
172
173 static void
174 do_convert_to_ssh2(struct passwd *pw)
175 {
176 Key *k;
177 u_int len;
178 u_char *blob;
179 struct stat st;
180
181 if (!have_identity)
182 ask_filename(pw, "Enter file in which the key is");
183 if (stat(identity_file, &st) < 0) {
184 perror(identity_file);
185 exit(1);
186 }
187 if ((k = key_load_public(identity_file, NULL)) == NULL) {
188 if ((k = load_identity(identity_file)) == NULL) {
189 fprintf(stderr, "load failed\n");
190 exit(1);
191 }
192 }
193 if (k->type == KEY_RSA1) {
194 fprintf(stderr, "version 1 keys are not supported\n");
195 exit(1);
196 }
197 if (key_to_blob(k, &blob, &len) <= 0) {
198 fprintf(stderr, "key_to_blob failed\n");
199 exit(1);
200 }
201 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
202 fprintf(stdout,
203 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
204 key_size(k), key_type(k),
205 pw->pw_name, hostname);
206 dump_base64(stdout, blob, len);
207 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
208 key_free(k);
209 xfree(blob);
210 exit(0);
211 }
212
213 static void
214 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
215 {
216 u_int bignum_bits = buffer_get_int(b);
217 u_int bytes = (bignum_bits + 7) / 8;
218
219 if (buffer_len(b) < bytes)
220 fatal("buffer_get_bignum_bits: input buffer too small: "
221 "need %d have %d", bytes, buffer_len(b));
222 BN_bin2bn(buffer_ptr(b), bytes, value);
223 buffer_consume(b, bytes);
224 }
225
226 static Key *
227 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
228 {
229 Buffer b;
230 Key *key = NULL;
231 char *type, *cipher;
232 u_char *sig, data[] = "abcde12345";
233 int magic, rlen, ktype, i1, i2, i3, i4;
234 u_int slen;
235 u_long e;
236
237 buffer_init(&b);
238 buffer_append(&b, blob, blen);
239
240 magic = buffer_get_int(&b);
241 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
242 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
243 buffer_free(&b);
244 return NULL;
245 }
246 i1 = buffer_get_int(&b);
247 type = buffer_get_string(&b, NULL);
248 cipher = buffer_get_string(&b, NULL);
249 i2 = buffer_get_int(&b);
250 i3 = buffer_get_int(&b);
251 i4 = buffer_get_int(&b);
252 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
253 if (strcmp(cipher, "none") != 0) {
254 error("unsupported cipher %s", cipher);
255 xfree(cipher);
256 buffer_free(&b);
257 xfree(type);
258 return NULL;
259 }
260 xfree(cipher);
261
262 if (strstr(type, "dsa")) {
263 ktype = KEY_DSA;
264 } else if (strstr(type, "rsa")) {
265 ktype = KEY_RSA;
266 } else {
267 buffer_free(&b);
268 xfree(type);
269 return NULL;
270 }
271 key = key_new_private(ktype);
272 xfree(type);
273
274 switch (key->type) {
275 case KEY_DSA:
276 buffer_get_bignum_bits(&b, key->dsa->p);
277 buffer_get_bignum_bits(&b, key->dsa->g);
278 buffer_get_bignum_bits(&b, key->dsa->q);
279 buffer_get_bignum_bits(&b, key->dsa->pub_key);
280 buffer_get_bignum_bits(&b, key->dsa->priv_key);
281 break;
282 case KEY_RSA:
283 e = buffer_get_char(&b);
284 debug("e %lx", e);
285 if (e < 30) {
286 e <<= 8;
287 e += buffer_get_char(&b);
288 debug("e %lx", e);
289 e <<= 8;
290 e += buffer_get_char(&b);
291 debug("e %lx", e);
292 }
293 if (!BN_set_word(key->rsa->e, e)) {
294 buffer_free(&b);
295 key_free(key);
296 return NULL;
297 }
298 buffer_get_bignum_bits(&b, key->rsa->d);
299 buffer_get_bignum_bits(&b, key->rsa->n);
300 buffer_get_bignum_bits(&b, key->rsa->iqmp);
301 buffer_get_bignum_bits(&b, key->rsa->q);
302 buffer_get_bignum_bits(&b, key->rsa->p);
303 rsa_generate_additional_parameters(key->rsa);
304 break;
305 }
306 rlen = buffer_len(&b);
307 if (rlen != 0)
308 error("do_convert_private_ssh2_from_blob: "
309 "remaining bytes in key blob %d", rlen);
310 buffer_free(&b);
311
312 /* try the key */
313 key_sign(key, &sig, &slen, data, sizeof(data));
314 key_verify(key, sig, slen, data, sizeof(data));
315 xfree(sig);
316 return key;
317 }
318
319 static int
320 get_line(FILE *fp, char *line, size_t len)
321 {
322 int c;
323 size_t pos = 0;
324
325 line[0] = '\0';
326 while ((c = fgetc(fp)) != EOF) {
327 if (pos >= len - 1) {
328 fprintf(stderr, "input line too long.\n");
329 exit(1);
330 }
331 switch (c) {
332 case '\r':
333 c = fgetc(fp);
334 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
335 fprintf(stderr, "unget: %s\n", strerror(errno));
336 exit(1);
337 }
338 return pos;
339 case '\n':
340 return pos;
341 }
342 line[pos++] = c;
343 line[pos] = '\0';
344 }
345 if (c == EOF)
346 return -1;
347 return pos;
348 }
349
350 static void
351 do_convert_from_ssh2(struct passwd *pw)
352 {
353 Key *k;
354 int blen;
355 u_int len;
356 char line[1024];
357 u_char blob[8096];
358 char encoded[8096];
359 struct stat st;
360 int escaped = 0, private = 0, ok;
361 FILE *fp;
362
363 if (!have_identity)
364 ask_filename(pw, "Enter file in which the key is");
365 if (stat(identity_file, &st) < 0) {
366 perror(identity_file);
367 exit(1);
368 }
369 fp = fopen(identity_file, "r");
370 if (fp == NULL) {
371 perror(identity_file);
372 exit(1);
373 }
374 encoded[0] = '\0';
375 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
376 if (line[blen - 1] == '\\')
377 escaped++;
378 if (strncmp(line, "----", 4) == 0 ||
379 strstr(line, ": ") != NULL) {
380 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
381 private = 1;
382 if (strstr(line, " END ") != NULL) {
383 break;
384 }
385 /* fprintf(stderr, "ignore: %s", line); */
386 continue;
387 }
388 if (escaped) {
389 escaped--;
390 /* fprintf(stderr, "escaped: %s", line); */
391 continue;
392 }
393 strlcat(encoded, line, sizeof(encoded));
394 }
395 len = strlen(encoded);
396 if (((len % 4) == 3) &&
397 (encoded[len-1] == '=') &&
398 (encoded[len-2] == '=') &&
399 (encoded[len-3] == '='))
400 encoded[len-3] = '\0';
401 blen = uudecode(encoded, blob, sizeof(blob));
402 if (blen < 0) {
403 fprintf(stderr, "uudecode failed.\n");
404 exit(1);
405 }
406 k = private ?
407 do_convert_private_ssh2_from_blob(blob, blen) :
408 key_from_blob(blob, blen);
409 if (k == NULL) {
410 fprintf(stderr, "decode blob failed.\n");
411 exit(1);
412 }
413 ok = private ?
414 (k->type == KEY_DSA ?
415 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
416 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
417 key_write(k, stdout);
418 if (!ok) {
419 fprintf(stderr, "key write failed");
420 exit(1);
421 }
422 key_free(k);
423 if (!private)
424 fprintf(stdout, "\n");
425 fclose(fp);
426 exit(0);
427 }
428
429 static void
430 do_print_public(struct passwd *pw)
431 {
432 Key *prv;
433 struct stat st;
434
435 if (!have_identity)
436 ask_filename(pw, "Enter file in which the key is");
437 if (stat(identity_file, &st) < 0) {
438 perror(identity_file);
439 exit(1);
440 }
441 prv = load_identity(identity_file);
442 if (prv == NULL) {
443 fprintf(stderr, "load failed\n");
444 exit(1);
445 }
446 if (!key_write(prv, stdout))
447 fprintf(stderr, "key_write failed");
448 key_free(prv);
449 fprintf(stdout, "\n");
450 exit(0);
451 }
452
453 #ifdef SMARTCARD
454 static void
455 do_upload(struct passwd *pw, const char *sc_reader_id)
456 {
457 Key *prv = NULL;
458 struct stat st;
459 int ret;
460
461 if (!have_identity)
462 ask_filename(pw, "Enter file in which the key is");
463 if (stat(identity_file, &st) < 0) {
464 perror(identity_file);
465 exit(1);
466 }
467 prv = load_identity(identity_file);
468 if (prv == NULL) {
469 error("load failed");
470 exit(1);
471 }
472 ret = sc_put_key(prv, sc_reader_id);
473 key_free(prv);
474 if (ret < 0)
475 exit(1);
476 logit("loading key done");
477 exit(0);
478 }
479
480 static void
481 do_download(struct passwd *pw, const char *sc_reader_id)
482 {
483 Key **keys = NULL;
484 int i;
485
486 keys = sc_get_keys(sc_reader_id, NULL);
487 if (keys == NULL)
488 fatal("cannot read public key from smartcard");
489 for (i = 0; keys[i]; i++) {
490 key_write(keys[i], stdout);
491 key_free(keys[i]);
492 fprintf(stdout, "\n");
493 }
494 xfree(keys);
495 exit(0);
496 }
497 #endif /* SMARTCARD */
498
499 static void
500 do_fingerprint(struct passwd *pw)
501 {
502 FILE *f;
503 Key *public;
504 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
505 int i, skip = 0, num = 1, invalid = 1;
506 enum fp_rep rep;
507 enum fp_type fptype;
508 struct stat st;
509
510 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
511 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
512
513 if (!have_identity)
514 ask_filename(pw, "Enter file in which the key is");
515 if (stat(identity_file, &st) < 0) {
516 perror(identity_file);
517 exit(1);
518 }
519 public = key_load_public(identity_file, &comment);
520 if (public != NULL) {
521 fp = key_fingerprint(public, fptype, rep);
522 printf("%u %s %s\n", key_size(public), fp, comment);
523 key_free(public);
524 xfree(comment);
525 xfree(fp);
526 exit(0);
527 }
528 if (comment) {
529 xfree(comment);
530 comment = NULL;
531 }
532
533 f = fopen(identity_file, "r");
534 if (f != NULL) {
535 while (fgets(line, sizeof(line), f)) {
536 i = strlen(line) - 1;
537 if (line[i] != '\n') {
538 error("line %d too long: %.40s...", num, line);
539 skip = 1;
540 continue;
541 }
542 num++;
543 if (skip) {
544 skip = 0;
545 continue;
546 }
547 line[i] = '\0';
548
549 /* Skip leading whitespace, empty and comment lines. */
550 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
551 ;
552 if (!*cp || *cp == '\n' || *cp == '#')
553 continue ;
554 i = strtol(cp, &ep, 10);
555 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
556 int quoted = 0;
557 comment = cp;
558 for (; *cp && (quoted || (*cp != ' ' &&
559 *cp != '\t')); cp++) {
560 if (*cp == '\\' && cp[1] == '"')
561 cp++; /* Skip both */
562 else if (*cp == '"')
563 quoted = !quoted;
564 }
565 if (!*cp)
566 continue;
567 *cp++ = '\0';
568 }
569 ep = cp;
570 public = key_new(KEY_RSA1);
571 if (key_read(public, &cp) != 1) {
572 cp = ep;
573 key_free(public);
574 public = key_new(KEY_UNSPEC);
575 if (key_read(public, &cp) != 1) {
576 key_free(public);
577 continue;
578 }
579 }
580 comment = *cp ? cp : comment;
581 fp = key_fingerprint(public, fptype, rep);
582 printf("%u %s %s\n", key_size(public), fp,
583 comment ? comment : "no comment");
584 xfree(fp);
585 key_free(public);
586 invalid = 0;
587 }
588 fclose(f);
589 }
590 if (invalid) {
591 printf("%s is not a public key file.\n", identity_file);
592 exit(1);
593 }
594 exit(0);
595 }
596
597 static void
598 print_host(FILE *f, char *name, Key *public, int hash)
599 {
600 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
601 fatal("hash_host failed");
602 fprintf(f, "%s ", name);
603 if (!key_write(public, f))
604 fatal("key_write failed");
605 fprintf(f, "\n");
606 }
607
608 static void
609 do_known_hosts(struct passwd *pw, const char *name)
610 {
611 FILE *in, *out = stdout;
612 Key *public;
613 char *cp, *cp2, *kp, *kp2;
614 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
615 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
616
617 if (!have_identity) {
618 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
619 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
620 sizeof(identity_file))
621 fatal("Specified known hosts path too long");
622 xfree(cp);
623 have_identity = 1;
624 }
625 if ((in = fopen(identity_file, "r")) == NULL)
626 fatal("fopen: %s", strerror(errno));
627
628 /*
629 * Find hosts goes to stdout, hash and deletions happen in-place
630 * A corner case is ssh-keygen -HF foo, which should go to stdout
631 */
632 if (!find_host && (hash_hosts || delete_host)) {
633 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
634 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
635 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
636 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
637 fatal("known_hosts path too long");
638 umask(077);
639 if ((c = mkstemp(tmp)) == -1)
640 fatal("mkstemp: %s", strerror(errno));
641 if ((out = fdopen(c, "w")) == NULL) {
642 c = errno;
643 unlink(tmp);
644 fatal("fdopen: %s", strerror(c));
645 }
646 inplace = 1;
647 }
648
649 while (fgets(line, sizeof(line), in)) {
650 num++;
651 i = strlen(line) - 1;
652 if (line[i] != '\n') {
653 error("line %d too long: %.40s...", num, line);
654 skip = 1;
655 invalid = 1;
656 continue;
657 }
658 if (skip) {
659 skip = 0;
660 continue;
661 }
662 line[i] = '\0';
663
664 /* Skip leading whitespace, empty and comment lines. */
665 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
666 ;
667 if (!*cp || *cp == '\n' || *cp == '#') {
668 if (inplace)
669 fprintf(out, "%s\n", cp);
670 continue;
671 }
672 /* Find the end of the host name portion. */
673 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
674 ;
675 if (*kp == '\0' || *(kp + 1) == '\0') {
676 error("line %d missing key: %.40s...",
677 num, line);
678 invalid = 1;
679 continue;
680 }
681 *kp++ = '\0';
682 kp2 = kp;
683
684 public = key_new(KEY_RSA1);
685 if (key_read(public, &kp) != 1) {
686 kp = kp2;
687 key_free(public);
688 public = key_new(KEY_UNSPEC);
689 if (key_read(public, &kp) != 1) {
690 error("line %d invalid key: %.40s...",
691 num, line);
692 key_free(public);
693 invalid = 1;
694 continue;
695 }
696 }
697
698 if (*cp == HASH_DELIM) {
699 if (find_host || delete_host) {
700 cp2 = host_hash(name, cp, strlen(cp));
701 if (cp2 == NULL) {
702 error("line %d: invalid hashed "
703 "name: %.64s...", num, line);
704 invalid = 1;
705 continue;
706 }
707 c = (strcmp(cp2, cp) == 0);
708 if (find_host && c) {
709 printf("# Host %s found: "
710 "line %d type %s\n", name,
711 num, key_type(public));
712 print_host(out, cp, public, 0);
713 }
714 if (delete_host && !c)
715 print_host(out, cp, public, 0);
716 } else if (hash_hosts)
717 print_host(out, cp, public, 0);
718 } else {
719 if (find_host || delete_host) {
720 c = (match_hostname(name, cp,
721 strlen(cp)) == 1);
722 if (find_host && c) {
723 printf("# Host %s found: "
724 "line %d type %s\n", name,
725 num, key_type(public));
726 print_host(out, cp, public, hash_hosts);
727 }
728 if (delete_host && !c)
729 print_host(out, cp, public, 0);
730 } else if (hash_hosts) {
731 for (cp2 = strsep(&cp, ",");
732 cp2 != NULL && *cp2 != '\0';
733 cp2 = strsep(&cp, ",")) {
734 if (strcspn(cp2, "*?!") != strlen(cp2))
735 fprintf(stderr, "Warning: "
736 "ignoring host name with "
737 "metacharacters: %.64s\n",
738 cp2);
739 else
740 print_host(out, cp2, public, 1);
741 }
742 has_unhashed = 1;
743 }
744 }
745 key_free(public);
746 }
747 fclose(in);
748
749 if (invalid) {
750 fprintf(stderr, "%s is not a valid known_host file.\n",
751 identity_file);
752 if (inplace) {
753 fprintf(stderr, "Not replacing existing known_hosts "
754 "file because of errors\n");
755 fclose(out);
756 unlink(tmp);
757 }
758 exit(1);
759 }
760
761 if (inplace) {
762 fclose(out);
763
764 /* Backup existing file */
765 if (unlink(old) == -1 && errno != ENOENT)
766 fatal("unlink %.100s: %s", old, strerror(errno));
767 if (link(identity_file, old) == -1)
768 fatal("link %.100s to %.100s: %s", identity_file, old,
769 strerror(errno));
770 /* Move new one into place */
771 if (rename(tmp, identity_file) == -1) {
772 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
773 strerror(errno));
774 unlink(tmp);
775 unlink(old);
776 exit(1);
777 }
778
779 fprintf(stderr, "%s updated.\n", identity_file);
780 fprintf(stderr, "Original contents retained as %s\n", old);
781 if (has_unhashed) {
782 fprintf(stderr, "WARNING: %s contains unhashed "
783 "entries\n", old);
784 fprintf(stderr, "Delete this file to ensure privacy "
785 "of hostnames\n");
786 }
787 }
788
789 exit(0);
790 }
791
792 /*
793 * Perform changing a passphrase. The argument is the passwd structure
794 * for the current user.
795 */
796 static void
797 do_change_passphrase(struct passwd *pw)
798 {
799 char *comment;
800 char *old_passphrase, *passphrase1, *passphrase2;
801 struct stat st;
802 Key *private;
803
804 if (!have_identity)
805 ask_filename(pw, "Enter file in which the key is");
806 if (stat(identity_file, &st) < 0) {
807 perror(identity_file);
808 exit(1);
809 }
810 /* Try to load the file with empty passphrase. */
811 private = key_load_private(identity_file, "", &comment);
812 if (private == NULL) {
813 if (identity_passphrase)
814 old_passphrase = xstrdup(identity_passphrase);
815 else
816 old_passphrase =
817 read_passphrase("Enter old passphrase: ",
818 RP_ALLOW_STDIN);
819 private = key_load_private(identity_file, old_passphrase,
820 &comment);
821 memset(old_passphrase, 0, strlen(old_passphrase));
822 xfree(old_passphrase);
823 if (private == NULL) {
824 printf("Bad passphrase.\n");
825 exit(1);
826 }
827 }
828 printf("Key has comment '%s'\n", comment);
829
830 /* Ask the new passphrase (twice). */
831 if (identity_new_passphrase) {
832 passphrase1 = xstrdup(identity_new_passphrase);
833 passphrase2 = NULL;
834 } else {
835 passphrase1 =
836 read_passphrase("Enter new passphrase (empty for no "
837 "passphrase): ", RP_ALLOW_STDIN);
838 passphrase2 = read_passphrase("Enter same passphrase again: ",
839 RP_ALLOW_STDIN);
840
841 /* Verify that they are the same. */
842 if (strcmp(passphrase1, passphrase2) != 0) {
843 memset(passphrase1, 0, strlen(passphrase1));
844 memset(passphrase2, 0, strlen(passphrase2));
845 xfree(passphrase1);
846 xfree(passphrase2);
847 printf("Pass phrases do not match. Try again.\n");
848 exit(1);
849 }
850 /* Destroy the other copy. */
851 memset(passphrase2, 0, strlen(passphrase2));
852 xfree(passphrase2);
853 }
854
855 /* Save the file using the new passphrase. */
856 if (!key_save_private(private, identity_file, passphrase1, comment)) {
857 printf("Saving the key failed: %s.\n", identity_file);
858 memset(passphrase1, 0, strlen(passphrase1));
859 xfree(passphrase1);
860 key_free(private);
861 xfree(comment);
862 exit(1);
863 }
864 /* Destroy the passphrase and the copy of the key in memory. */
865 memset(passphrase1, 0, strlen(passphrase1));
866 xfree(passphrase1);
867 key_free(private); /* Destroys contents */
868 xfree(comment);
869
870 printf("Your identification has been saved with the new passphrase.\n");
871 exit(0);
872 }
873
874 /*
875 * Print the SSHFP RR.
876 */
877 static int
878 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
879 {
880 Key *public;
881 char *comment = NULL;
882 struct stat st;
883
884 if (fname == NULL)
885 ask_filename(pw, "Enter file in which the key is");
886 if (stat(fname, &st) < 0) {
887 if (errno == ENOENT)
888 return 0;
889 perror(fname);
890 exit(1);
891 }
892 public = key_load_public(fname, &comment);
893 if (public != NULL) {
894 export_dns_rr(hname, public, stdout, print_generic);
895 key_free(public);
896 xfree(comment);
897 return 1;
898 }
899 if (comment)
900 xfree(comment);
901
902 printf("failed to read v2 public key from %s.\n", fname);
903 exit(1);
904 }
905
906 /*
907 * Change the comment of a private key file.
908 */
909 static void
910 do_change_comment(struct passwd *pw)
911 {
912 char new_comment[1024], *comment, *passphrase;
913 Key *private;
914 Key *public;
915 struct stat st;
916 FILE *f;
917 int fd;
918
919 if (!have_identity)
920 ask_filename(pw, "Enter file in which the key is");
921 if (stat(identity_file, &st) < 0) {
922 perror(identity_file);
923 exit(1);
924 }
925 private = key_load_private(identity_file, "", &comment);
926 if (private == NULL) {
927 if (identity_passphrase)
928 passphrase = xstrdup(identity_passphrase);
929 else if (identity_new_passphrase)
930 passphrase = xstrdup(identity_new_passphrase);
931 else
932 passphrase = read_passphrase("Enter passphrase: ",
933 RP_ALLOW_STDIN);
934 /* Try to load using the passphrase. */
935 private = key_load_private(identity_file, passphrase, &comment);
936 if (private == NULL) {
937 memset(passphrase, 0, strlen(passphrase));
938 xfree(passphrase);
939 printf("Bad passphrase.\n");
940 exit(1);
941 }
942 } else {
943 passphrase = xstrdup("");
944 }
945 if (private->type != KEY_RSA1) {
946 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
947 key_free(private);
948 exit(1);
949 }
950 printf("Key now has comment '%s'\n", comment);
951
952 if (identity_comment) {
953 strlcpy(new_comment, identity_comment, sizeof(new_comment));
954 } else {
955 printf("Enter new comment: ");
956 fflush(stdout);
957 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
958 memset(passphrase, 0, strlen(passphrase));
959 key_free(private);
960 exit(1);
961 }
962 if (strchr(new_comment, '\n'))
963 *strchr(new_comment, '\n') = 0;
964 }
965
966 /* Save the file using the new passphrase. */
967 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
968 printf("Saving the key failed: %s.\n", identity_file);
969 memset(passphrase, 0, strlen(passphrase));
970 xfree(passphrase);
971 key_free(private);
972 xfree(comment);
973 exit(1);
974 }
975 memset(passphrase, 0, strlen(passphrase));
976 xfree(passphrase);
977 public = key_from_private(private);
978 key_free(private);
979
980 strlcat(identity_file, ".pub", sizeof(identity_file));
981 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
982 if (fd == -1) {
983 printf("Could not save your public key in %s\n", identity_file);
984 exit(1);
985 }
986 f = fdopen(fd, "w");
987 if (f == NULL) {
988 printf("fdopen %s failed", identity_file);
989 exit(1);
990 }
991 if (!key_write(public, f))
992 fprintf(stderr, "write key failed");
993 key_free(public);
994 fprintf(f, " %s\n", new_comment);
995 fclose(f);
996
997 xfree(comment);
998
999 printf("The comment in your key file has been changed.\n");
1000 exit(0);
1001 }
1002
1003 static void
1004 usage(void)
1005 {
1006 fprintf(stderr, "Usage: %s [options]\n", __progname);
1007 fprintf(stderr, "Options:\n");
1008 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1009 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1010 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1011 fprintf(stderr, " -C comment Provide new comment.\n");
1012 fprintf(stderr, " -c Change comment in private and public key files.\n");
1013 #ifdef SMARTCARD
1014 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1015 #endif /* SMARTCARD */
1016 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
1017 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1018 fprintf(stderr, " -f filename Filename of the key file.\n");
1019 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1020 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1021 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1022 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
1023 fprintf(stderr, " -l Show fingerprint of key file.\n");
1024 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1025 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1026 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1027 fprintf(stderr, " -p Change passphrase of private key file.\n");
1028 fprintf(stderr, " -q Quiet.\n");
1029 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1030 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1031 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1032 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1033 fprintf(stderr, " -t type Specify type of key to create.\n");
1034 #ifdef SMARTCARD
1035 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1036 #endif /* SMARTCARD */
1037 fprintf(stderr, " -v Verbose.\n");
1038 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1039 fprintf(stderr, " -y Read private key file and print public key.\n");
1040
1041 exit(1);
1042 }
1043
1044 /*
1045 * Main program for key management.
1046 */
1047 int
1048 main(int ac, char **av)
1049 {
1050 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1051 char out_file[MAXPATHLEN], *reader_id = NULL;
1052 char *rr_hostname = NULL;
1053 Key *private, *public;
1054 struct passwd *pw;
1055 struct stat st;
1056 int opt, type, fd, download = 0;
1057 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1058 int do_gen_candidates = 0, do_screen_candidates = 0;
1059 int log_level = SYSLOG_LEVEL_INFO;
1060 BIGNUM *start = NULL;
1061 FILE *f;
1062 const char *errstr;
1063
1064 extern int optind;
1065 extern char *optarg;
1066
1067 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1068 sanitise_stdfd();
1069
1070 __progname = ssh_get_progname(av[0]);
1071
1072 SSLeay_add_all_algorithms();
1073 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1074
1075 init_rng();
1076 seed_rng();
1077
1078 /* we need this for the home * directory. */
1079 pw = getpwuid(getuid());
1080 if (!pw) {
1081 printf("You don't exist, go away!\n");
1082 exit(1);
1083 }
1084 if (gethostname(hostname, sizeof(hostname)) < 0) {
1085 perror("gethostname");
1086 exit(1);
1087 }
1088
1089 while ((opt = getopt(ac, av,
1090 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1091 switch (opt) {
1092 case 'b':
1093 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1094 if (errstr)
1095 fatal("Bits has bad value %s (%s)",
1096 optarg, errstr);
1097 break;
1098 case 'F':
1099 find_host = 1;
1100 rr_hostname = optarg;
1101 break;
1102 case 'H':
1103 hash_hosts = 1;
1104 break;
1105 case 'R':
1106 delete_host = 1;
1107 rr_hostname = optarg;
1108 break;
1109 case 'l':
1110 print_fingerprint = 1;
1111 break;
1112 case 'B':
1113 print_bubblebabble = 1;
1114 break;
1115 case 'p':
1116 change_passphrase = 1;
1117 break;
1118 case 'c':
1119 change_comment = 1;
1120 break;
1121 case 'f':
1122 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1123 sizeof(identity_file))
1124 fatal("Identity filename too long");
1125 have_identity = 1;
1126 break;
1127 case 'g':
1128 print_generic = 1;
1129 break;
1130 case 'P':
1131 identity_passphrase = optarg;
1132 break;
1133 case 'N':
1134 identity_new_passphrase = optarg;
1135 break;
1136 case 'C':
1137 identity_comment = optarg;
1138 break;
1139 case 'q':
1140 quiet = 1;
1141 break;
1142 case 'e':
1143 case 'x':
1144 /* export key */
1145 convert_to_ssh2 = 1;
1146 break;
1147 case 'i':
1148 case 'X':
1149 /* import key */
1150 convert_from_ssh2 = 1;
1151 break;
1152 case 'y':
1153 print_public = 1;
1154 break;
1155 case 'd':
1156 key_type_name = "dsa";
1157 break;
1158 case 't':
1159 key_type_name = optarg;
1160 break;
1161 case 'D':
1162 download = 1;
1163 /*FALLTHROUGH*/
1164 case 'U':
1165 reader_id = optarg;
1166 break;
1167 case 'v':
1168 if (log_level == SYSLOG_LEVEL_INFO)
1169 log_level = SYSLOG_LEVEL_DEBUG1;
1170 else {
1171 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1172 log_level < SYSLOG_LEVEL_DEBUG3)
1173 log_level++;
1174 }
1175 break;
1176 case 'r':
1177 rr_hostname = optarg;
1178 break;
1179 case 'W':
1180 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1181 UINT_MAX, &errstr);
1182 if (errstr)
1183 fatal("Desired generator has bad value: %s (%s)",
1184 optarg, errstr);
1185 break;
1186 case 'a':
1187 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1188 if (errstr)
1189 fatal("Invalid number of trials: %s (%s)",
1190 optarg, errstr);
1191 break;
1192 case 'M':
1193 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1194 if (errstr) {
1195 fatal("Memory limit is %s: %s", errstr, optarg);
1196 }
1197 break;
1198 case 'G':
1199 do_gen_candidates = 1;
1200 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1201 sizeof(out_file))
1202 fatal("Output filename too long");
1203 break;
1204 case 'T':
1205 do_screen_candidates = 1;
1206 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1207 sizeof(out_file))
1208 fatal("Output filename too long");
1209 break;
1210 case 'S':
1211 /* XXX - also compare length against bits */
1212 if (BN_hex2bn(&start, optarg) == 0)
1213 fatal("Invalid start point.");
1214 break;
1215 case '?':
1216 default:
1217 usage();
1218 }
1219 }
1220
1221 /* reinit */
1222 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1223
1224 if (optind < ac) {
1225 printf("Too many arguments.\n");
1226 usage();
1227 }
1228 if (change_passphrase && change_comment) {
1229 printf("Can only have one of -p and -c.\n");
1230 usage();
1231 }
1232 if (delete_host || hash_hosts || find_host)
1233 do_known_hosts(pw, rr_hostname);
1234 if (print_fingerprint || print_bubblebabble)
1235 do_fingerprint(pw);
1236 if (change_passphrase)
1237 do_change_passphrase(pw);
1238 if (change_comment)
1239 do_change_comment(pw);
1240 if (convert_to_ssh2)
1241 do_convert_to_ssh2(pw);
1242 if (convert_from_ssh2)
1243 do_convert_from_ssh2(pw);
1244 if (print_public)
1245 do_print_public(pw);
1246 if (rr_hostname != NULL) {
1247 unsigned int n = 0;
1248
1249 if (have_identity) {
1250 n = do_print_resource_record(pw,
1251 identity_file, rr_hostname);
1252 if (n == 0) {
1253 perror(identity_file);
1254 exit(1);
1255 }
1256 exit(0);
1257 } else {
1258
1259 n += do_print_resource_record(pw,
1260 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1261 n += do_print_resource_record(pw,
1262 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1263
1264 if (n == 0)
1265 fatal("no keys found.");
1266 exit(0);
1267 }
1268 }
1269 if (reader_id != NULL) {
1270 #ifdef SMARTCARD
1271 if (download)
1272 do_download(pw, reader_id);
1273 else
1274 do_upload(pw, reader_id);
1275 #else /* SMARTCARD */
1276 fatal("no support for smartcards.");
1277 #endif /* SMARTCARD */
1278 }
1279
1280 if (do_gen_candidates) {
1281 FILE *out = fopen(out_file, "w");
1282
1283 if (out == NULL) {
1284 error("Couldn't open modulus candidate file \"%s\": %s",
1285 out_file, strerror(errno));
1286 return (1);
1287 }
1288 if (bits == 0)
1289 bits = DEFAULT_BITS;
1290 if (gen_candidates(out, memory, bits, start) != 0)
1291 fatal("modulus candidate generation failed");
1292
1293 return (0);
1294 }
1295
1296 if (do_screen_candidates) {
1297 FILE *in;
1298 FILE *out = fopen(out_file, "w");
1299
1300 if (have_identity && strcmp(identity_file, "-") != 0) {
1301 if ((in = fopen(identity_file, "r")) == NULL) {
1302 fatal("Couldn't open modulus candidate "
1303 "file \"%s\": %s", identity_file,
1304 strerror(errno));
1305 }
1306 } else
1307 in = stdin;
1308
1309 if (out == NULL) {
1310 fatal("Couldn't open moduli file \"%s\": %s",
1311 out_file, strerror(errno));
1312 }
1313 if (prime_test(in, out, trials, generator_wanted) != 0)
1314 fatal("modulus screening failed");
1315 return (0);
1316 }
1317
1318 arc4random_stir();
1319
1320 if (key_type_name == NULL)
1321 key_type_name = "rsa";
1322
1323 type = key_type_from_name(key_type_name);
1324 if (type == KEY_UNSPEC) {
1325 fprintf(stderr, "unknown key type %s\n", key_type_name);
1326 exit(1);
1327 }
1328 if (bits == 0)
1329 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1330 if (type == KEY_DSA && bits != 1024)
1331 fatal("DSA keys must be 1024 bits");
1332 if (!quiet)
1333 printf("Generating public/private %s key pair.\n", key_type_name);
1334 private = key_generate(type, bits);
1335 if (private == NULL) {
1336 fprintf(stderr, "key_generate failed");
1337 exit(1);
1338 }
1339 public = key_from_private(private);
1340
1341 if (!have_identity)
1342 ask_filename(pw, "Enter file in which to save the key");
1343
1344 /* Create ~/.ssh directory if it doesn't already exist. */
1345 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1346 if (strstr(identity_file, dotsshdir) != NULL &&
1347 stat(dotsshdir, &st) < 0) {
1348 if (mkdir(dotsshdir, 0700) < 0)
1349 error("Could not create directory '%s'.", dotsshdir);
1350 else if (!quiet)
1351 printf("Created directory '%s'.\n", dotsshdir);
1352 }
1353 /* If the file already exists, ask the user to confirm. */
1354 if (stat(identity_file, &st) >= 0) {
1355 char yesno[3];
1356 printf("%s already exists.\n", identity_file);
1357 printf("Overwrite (y/n)? ");
1358 fflush(stdout);
1359 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1360 exit(1);
1361 if (yesno[0] != 'y' && yesno[0] != 'Y')
1362 exit(1);
1363 }
1364 /* Ask for a passphrase (twice). */
1365 if (identity_passphrase)
1366 passphrase1 = xstrdup(identity_passphrase);
1367 else if (identity_new_passphrase)
1368 passphrase1 = xstrdup(identity_new_passphrase);
1369 else {
1370 passphrase_again:
1371 passphrase1 =
1372 read_passphrase("Enter passphrase (empty for no "
1373 "passphrase): ", RP_ALLOW_STDIN);
1374 passphrase2 = read_passphrase("Enter same passphrase again: ",
1375 RP_ALLOW_STDIN);
1376 if (strcmp(passphrase1, passphrase2) != 0) {
1377 /*
1378 * The passphrases do not match. Clear them and
1379 * retry.
1380 */
1381 memset(passphrase1, 0, strlen(passphrase1));
1382 memset(passphrase2, 0, strlen(passphrase2));
1383 xfree(passphrase1);
1384 xfree(passphrase2);
1385 printf("Passphrases do not match. Try again.\n");
1386 goto passphrase_again;
1387 }
1388 /* Clear the other copy of the passphrase. */
1389 memset(passphrase2, 0, strlen(passphrase2));
1390 xfree(passphrase2);
1391 }
1392
1393 if (identity_comment) {
1394 strlcpy(comment, identity_comment, sizeof(comment));
1395 } else {
1396 /* Create default commend field for the passphrase. */
1397 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1398 }
1399
1400 /* Save the key with the given passphrase and comment. */
1401 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1402 printf("Saving the key failed: %s.\n", identity_file);
1403 memset(passphrase1, 0, strlen(passphrase1));
1404 xfree(passphrase1);
1405 exit(1);
1406 }
1407 /* Clear the passphrase. */
1408 memset(passphrase1, 0, strlen(passphrase1));
1409 xfree(passphrase1);
1410
1411 /* Clear the private key and the random number generator. */
1412 key_free(private);
1413 arc4random_stir();
1414
1415 if (!quiet)
1416 printf("Your identification has been saved in %s.\n", identity_file);
1417
1418 strlcat(identity_file, ".pub", sizeof(identity_file));
1419 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1420 if (fd == -1) {
1421 printf("Could not save your public key in %s\n", identity_file);
1422 exit(1);
1423 }
1424 f = fdopen(fd, "w");
1425 if (f == NULL) {
1426 printf("fdopen %s failed", identity_file);
1427 exit(1);
1428 }
1429 if (!key_write(public, f))
1430 fprintf(stderr, "write key failed");
1431 fprintf(f, " %s\n", comment);
1432 fclose(f);
1433
1434 if (!quiet) {
1435 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1436 printf("Your public key has been saved in %s.\n",
1437 identity_file);
1438 printf("The key fingerprint is:\n");
1439 printf("%s %s\n", fp, comment);
1440 xfree(fp);
1441 }
1442
1443 key_free(public);
1444 exit(0);
1445 }
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