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Import OpenSSH 4.5p1.
[dragonfly.git] / crypto / openssh-4 / ssh-keygen.c
blob1f42b93585a583da408b0ec5ab70a2e9ffac29d6
1 /* $OpenBSD: ssh-keygen.c,v 1.155 2006/11/06 21:25:28 markus 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 <stdarg.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37
38 #include "xmalloc.h"
39 #include "key.h"
40 #include "rsa.h"
41 #include "authfile.h"
42 #include "uuencode.h"
43 #include "buffer.h"
44 #include "pathnames.h"
45 #include "log.h"
46 #include "misc.h"
47 #include "match.h"
48 #include "hostfile.h"
49 #include "dns.h"
50
51 #ifdef SMARTCARD
52 #include "scard.h"
53 #endif
54
55 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
56 #define DEFAULT_BITS 2048
57 #define DEFAULT_BITS_DSA 1024
58 u_int32_t bits = 0;
59
60 /*
61 * Flag indicating that we just want to change the passphrase. This can be
62 * set on the command line.
63 */
64 int change_passphrase = 0;
65
66 /*
67 * Flag indicating that we just want to change the comment. This can be set
68 * on the command line.
69 */
70 int change_comment = 0;
71
72 int quiet = 0;
73
74 /* Flag indicating that we want to hash a known_hosts file */
75 int hash_hosts = 0;
76 /* Flag indicating that we want lookup a host in known_hosts file */
77 int find_host = 0;
78 /* Flag indicating that we want to delete a host from a known_hosts file */
79 int delete_host = 0;
80
81 /* Flag indicating that we just want to see the key fingerprint */
82 int print_fingerprint = 0;
83 int print_bubblebabble = 0;
84
85 /* The identity file name, given on the command line or entered by the user. */
86 char identity_file[1024];
87 int have_identity = 0;
88
89 /* This is set to the passphrase if given on the command line. */
90 char *identity_passphrase = NULL;
91
92 /* This is set to the new passphrase if given on the command line. */
93 char *identity_new_passphrase = NULL;
94
95 /* This is set to the new comment if given on the command line. */
96 char *identity_comment = NULL;
97
98 /* Dump public key file in format used by real and the original SSH 2 */
99 int convert_to_ssh2 = 0;
100 int convert_from_ssh2 = 0;
101 int print_public = 0;
102 int print_generic = 0;
103
104 char *key_type_name = NULL;
105
106 /* argv0 */
107 extern char *__progname;
108
109 char hostname[MAXHOSTNAMELEN];
110
111 /* moduli.c */
112 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
113 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
114
115 static void
116 ask_filename(struct passwd *pw, const char *prompt)
117 {
118 char buf[1024];
119 char *name = NULL;
120
121 if (key_type_name == NULL)
122 name = _PATH_SSH_CLIENT_ID_RSA;
123 else {
124 switch (key_type_from_name(key_type_name)) {
125 case KEY_RSA1:
126 name = _PATH_SSH_CLIENT_IDENTITY;
127 break;
128 case KEY_DSA:
129 name = _PATH_SSH_CLIENT_ID_DSA;
130 break;
131 case KEY_RSA:
132 name = _PATH_SSH_CLIENT_ID_RSA;
133 break;
134 default:
135 fprintf(stderr, "bad key type");
136 exit(1);
137 break;
138 }
139 }
140 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
141 fprintf(stderr, "%s (%s): ", prompt, identity_file);
142 if (fgets(buf, sizeof(buf), stdin) == NULL)
143 exit(1);
144 if (strchr(buf, '\n'))
145 *strchr(buf, '\n') = 0;
146 if (strcmp(buf, "") != 0)
147 strlcpy(identity_file, buf, sizeof(identity_file));
148 have_identity = 1;
149 }
150
151 static Key *
152 load_identity(char *filename)
153 {
154 char *pass;
155 Key *prv;
156
157 prv = key_load_private(filename, "", NULL);
158 if (prv == NULL) {
159 if (identity_passphrase)
160 pass = xstrdup(identity_passphrase);
161 else
162 pass = read_passphrase("Enter passphrase: ",
163 RP_ALLOW_STDIN);
164 prv = key_load_private(filename, pass, NULL);
165 memset(pass, 0, strlen(pass));
166 xfree(pass);
167 }
168 return prv;
169 }
170
171 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
172 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
173 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
174 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
175
176 static void
177 do_convert_to_ssh2(struct passwd *pw)
178 {
179 Key *k;
180 u_int len;
181 u_char *blob;
182 struct stat st;
183
184 if (!have_identity)
185 ask_filename(pw, "Enter file in which the key is");
186 if (stat(identity_file, &st) < 0) {
187 perror(identity_file);
188 exit(1);
189 }
190 if ((k = key_load_public(identity_file, NULL)) == NULL) {
191 if ((k = load_identity(identity_file)) == NULL) {
192 fprintf(stderr, "load failed\n");
193 exit(1);
194 }
195 }
196 if (k->type == KEY_RSA1) {
197 fprintf(stderr, "version 1 keys are not supported\n");
198 exit(1);
199 }
200 if (key_to_blob(k, &blob, &len) <= 0) {
201 fprintf(stderr, "key_to_blob failed\n");
202 exit(1);
203 }
204 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
205 fprintf(stdout,
206 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
207 key_size(k), key_type(k),
208 pw->pw_name, hostname);
209 dump_base64(stdout, blob, len);
210 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
211 key_free(k);
212 xfree(blob);
213 exit(0);
214 }
215
216 static void
217 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
218 {
219 u_int bignum_bits = buffer_get_int(b);
220 u_int bytes = (bignum_bits + 7) / 8;
221
222 if (buffer_len(b) < bytes)
223 fatal("buffer_get_bignum_bits: input buffer too small: "
224 "need %d have %d", bytes, buffer_len(b));
225 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL)
226 fatal("buffer_get_bignum_bits: BN_bin2bn failed");
227 buffer_consume(b, bytes);
228 }
229
230 static Key *
231 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
232 {
233 Buffer b;
234 Key *key = NULL;
235 char *type, *cipher;
236 u_char *sig, data[] = "abcde12345";
237 int magic, rlen, ktype, i1, i2, i3, i4;
238 u_int slen;
239 u_long e;
240
241 buffer_init(&b);
242 buffer_append(&b, blob, blen);
243
244 magic = buffer_get_int(&b);
245 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
246 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
247 buffer_free(&b);
248 return NULL;
249 }
250 i1 = buffer_get_int(&b);
251 type = buffer_get_string(&b, NULL);
252 cipher = buffer_get_string(&b, NULL);
253 i2 = buffer_get_int(&b);
254 i3 = buffer_get_int(&b);
255 i4 = buffer_get_int(&b);
256 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
257 if (strcmp(cipher, "none") != 0) {
258 error("unsupported cipher %s", cipher);
259 xfree(cipher);
260 buffer_free(&b);
261 xfree(type);
262 return NULL;
263 }
264 xfree(cipher);
265
266 if (strstr(type, "dsa")) {
267 ktype = KEY_DSA;
268 } else if (strstr(type, "rsa")) {
269 ktype = KEY_RSA;
270 } else {
271 buffer_free(&b);
272 xfree(type);
273 return NULL;
274 }
275 key = key_new_private(ktype);
276 xfree(type);
277
278 switch (key->type) {
279 case KEY_DSA:
280 buffer_get_bignum_bits(&b, key->dsa->p);
281 buffer_get_bignum_bits(&b, key->dsa->g);
282 buffer_get_bignum_bits(&b, key->dsa->q);
283 buffer_get_bignum_bits(&b, key->dsa->pub_key);
284 buffer_get_bignum_bits(&b, key->dsa->priv_key);
285 break;
286 case KEY_RSA:
287 e = buffer_get_char(&b);
288 debug("e %lx", e);
289 if (e < 30) {
290 e <<= 8;
291 e += buffer_get_char(&b);
292 debug("e %lx", e);
293 e <<= 8;
294 e += buffer_get_char(&b);
295 debug("e %lx", e);
296 }
297 if (!BN_set_word(key->rsa->e, e)) {
298 buffer_free(&b);
299 key_free(key);
300 return NULL;
301 }
302 buffer_get_bignum_bits(&b, key->rsa->d);
303 buffer_get_bignum_bits(&b, key->rsa->n);
304 buffer_get_bignum_bits(&b, key->rsa->iqmp);
305 buffer_get_bignum_bits(&b, key->rsa->q);
306 buffer_get_bignum_bits(&b, key->rsa->p);
307 rsa_generate_additional_parameters(key->rsa);
308 break;
309 }
310 rlen = buffer_len(&b);
311 if (rlen != 0)
312 error("do_convert_private_ssh2_from_blob: "
313 "remaining bytes in key blob %d", rlen);
314 buffer_free(&b);
315
316 /* try the key */
317 key_sign(key, &sig, &slen, data, sizeof(data));
318 key_verify(key, sig, slen, data, sizeof(data));
319 xfree(sig);
320 return key;
321 }
322
323 static int
324 get_line(FILE *fp, char *line, size_t len)
325 {
326 int c;
327 size_t pos = 0;
328
329 line[0] = '\0';
330 while ((c = fgetc(fp)) != EOF) {
331 if (pos >= len - 1) {
332 fprintf(stderr, "input line too long.\n");
333 exit(1);
334 }
335 switch (c) {
336 case '\r':
337 c = fgetc(fp);
338 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) {
339 fprintf(stderr, "unget: %s\n", strerror(errno));
340 exit(1);
341 }
342 return pos;
343 case '\n':
344 return pos;
345 }
346 line[pos++] = c;
347 line[pos] = '\0';
348 }
349 if (c == EOF)
350 return -1;
351 return pos;
352 }
353
354 static void
355 do_convert_from_ssh2(struct passwd *pw)
356 {
357 Key *k;
358 int blen;
359 u_int len;
360 char line[1024];
361 u_char blob[8096];
362 char encoded[8096];
363 struct stat st;
364 int escaped = 0, private = 0, ok;
365 FILE *fp;
366
367 if (!have_identity)
368 ask_filename(pw, "Enter file in which the key is");
369 if (stat(identity_file, &st) < 0) {
370 perror(identity_file);
371 exit(1);
372 }
373 fp = fopen(identity_file, "r");
374 if (fp == NULL) {
375 perror(identity_file);
376 exit(1);
377 }
378 encoded[0] = '\0';
379 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
380 if (line[blen - 1] == '\\')
381 escaped++;
382 if (strncmp(line, "----", 4) == 0 ||
383 strstr(line, ": ") != NULL) {
384 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
385 private = 1;
386 if (strstr(line, " END ") != NULL) {
387 break;
388 }
389 /* fprintf(stderr, "ignore: %s", line); */
390 continue;
391 }
392 if (escaped) {
393 escaped--;
394 /* fprintf(stderr, "escaped: %s", line); */
395 continue;
396 }
397 strlcat(encoded, line, sizeof(encoded));
398 }
399 len = strlen(encoded);
400 if (((len % 4) == 3) &&
401 (encoded[len-1] == '=') &&
402 (encoded[len-2] == '=') &&
403 (encoded[len-3] == '='))
404 encoded[len-3] = '\0';
405 blen = uudecode(encoded, blob, sizeof(blob));
406 if (blen < 0) {
407 fprintf(stderr, "uudecode failed.\n");
408 exit(1);
409 }
410 k = private ?
411 do_convert_private_ssh2_from_blob(blob, blen) :
412 key_from_blob(blob, blen);
413 if (k == NULL) {
414 fprintf(stderr, "decode blob failed.\n");
415 exit(1);
416 }
417 ok = private ?
418 (k->type == KEY_DSA ?
419 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
420 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
421 key_write(k, stdout);
422 if (!ok) {
423 fprintf(stderr, "key write failed");
424 exit(1);
425 }
426 key_free(k);
427 if (!private)
428 fprintf(stdout, "\n");
429 fclose(fp);
430 exit(0);
431 }
432
433 static void
434 do_print_public(struct passwd *pw)
435 {
436 Key *prv;
437 struct stat st;
438
439 if (!have_identity)
440 ask_filename(pw, "Enter file in which the key is");
441 if (stat(identity_file, &st) < 0) {
442 perror(identity_file);
443 exit(1);
444 }
445 prv = load_identity(identity_file);
446 if (prv == NULL) {
447 fprintf(stderr, "load failed\n");
448 exit(1);
449 }
450 if (!key_write(prv, stdout))
451 fprintf(stderr, "key_write failed");
452 key_free(prv);
453 fprintf(stdout, "\n");
454 exit(0);
455 }
456
457 #ifdef SMARTCARD
458 static void
459 do_upload(struct passwd *pw, const char *sc_reader_id)
460 {
461 Key *prv = NULL;
462 struct stat st;
463 int ret;
464
465 if (!have_identity)
466 ask_filename(pw, "Enter file in which the key is");
467 if (stat(identity_file, &st) < 0) {
468 perror(identity_file);
469 exit(1);
470 }
471 prv = load_identity(identity_file);
472 if (prv == NULL) {
473 error("load failed");
474 exit(1);
475 }
476 ret = sc_put_key(prv, sc_reader_id);
477 key_free(prv);
478 if (ret < 0)
479 exit(1);
480 logit("loading key done");
481 exit(0);
482 }
483
484 static void
485 do_download(struct passwd *pw, const char *sc_reader_id)
486 {
487 Key **keys = NULL;
488 int i;
489
490 keys = sc_get_keys(sc_reader_id, NULL);
491 if (keys == NULL)
492 fatal("cannot read public key from smartcard");
493 for (i = 0; keys[i]; i++) {
494 key_write(keys[i], stdout);
495 key_free(keys[i]);
496 fprintf(stdout, "\n");
497 }
498 xfree(keys);
499 exit(0);
500 }
501 #endif /* SMARTCARD */
502
503 static void
504 do_fingerprint(struct passwd *pw)
505 {
506 FILE *f;
507 Key *public;
508 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
509 int i, skip = 0, num = 1, invalid = 1;
510 enum fp_rep rep;
511 enum fp_type fptype;
512 struct stat st;
513
514 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
515 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
516
517 if (!have_identity)
518 ask_filename(pw, "Enter file in which the key is");
519 if (stat(identity_file, &st) < 0) {
520 perror(identity_file);
521 exit(1);
522 }
523 public = key_load_public(identity_file, &comment);
524 if (public != NULL) {
525 fp = key_fingerprint(public, fptype, rep);
526 printf("%u %s %s\n", key_size(public), fp, comment);
527 key_free(public);
528 xfree(comment);
529 xfree(fp);
530 exit(0);
531 }
532 if (comment) {
533 xfree(comment);
534 comment = NULL;
535 }
536
537 f = fopen(identity_file, "r");
538 if (f != NULL) {
539 while (fgets(line, sizeof(line), f)) {
540 i = strlen(line) - 1;
541 if (line[i] != '\n') {
542 error("line %d too long: %.40s...", num, line);
543 skip = 1;
544 continue;
545 }
546 num++;
547 if (skip) {
548 skip = 0;
549 continue;
550 }
551 line[i] = '\0';
552
553 /* Skip leading whitespace, empty and comment lines. */
554 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
555 ;
556 if (!*cp || *cp == '\n' || *cp == '#')
557 continue ;
558 i = strtol(cp, &ep, 10);
559 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
560 int quoted = 0;
561 comment = cp;
562 for (; *cp && (quoted || (*cp != ' ' &&
563 *cp != '\t')); cp++) {
564 if (*cp == '\\' && cp[1] == '"')
565 cp++; /* Skip both */
566 else if (*cp == '"')
567 quoted = !quoted;
568 }
569 if (!*cp)
570 continue;
571 *cp++ = '\0';
572 }
573 ep = cp;
574 public = key_new(KEY_RSA1);
575 if (key_read(public, &cp) != 1) {
576 cp = ep;
577 key_free(public);
578 public = key_new(KEY_UNSPEC);
579 if (key_read(public, &cp) != 1) {
580 key_free(public);
581 continue;
582 }
583 }
584 comment = *cp ? cp : comment;
585 fp = key_fingerprint(public, fptype, rep);
586 printf("%u %s %s\n", key_size(public), fp,
587 comment ? comment : "no comment");
588 xfree(fp);
589 key_free(public);
590 invalid = 0;
591 }
592 fclose(f);
593 }
594 if (invalid) {
595 printf("%s is not a public key file.\n", identity_file);
596 exit(1);
597 }
598 exit(0);
599 }
600
601 static void
602 print_host(FILE *f, char *name, Key *public, int hash)
603 {
604 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
605 fatal("hash_host failed");
606 fprintf(f, "%s ", name);
607 if (!key_write(public, f))
608 fatal("key_write failed");
609 fprintf(f, "\n");
610 }
611
612 static void
613 do_known_hosts(struct passwd *pw, const char *name)
614 {
615 FILE *in, *out = stdout;
616 Key *public;
617 char *cp, *cp2, *kp, *kp2;
618 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
619 int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
620
621 if (!have_identity) {
622 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
623 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
624 sizeof(identity_file))
625 fatal("Specified known hosts path too long");
626 xfree(cp);
627 have_identity = 1;
628 }
629 if ((in = fopen(identity_file, "r")) == NULL)
630 fatal("fopen: %s", strerror(errno));
631
632 /*
633 * Find hosts goes to stdout, hash and deletions happen in-place
634 * A corner case is ssh-keygen -HF foo, which should go to stdout
635 */
636 if (!find_host && (hash_hosts || delete_host)) {
637 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
638 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
639 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
640 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
641 fatal("known_hosts path too long");
642 umask(077);
643 if ((c = mkstemp(tmp)) == -1)
644 fatal("mkstemp: %s", strerror(errno));
645 if ((out = fdopen(c, "w")) == NULL) {
646 c = errno;
647 unlink(tmp);
648 fatal("fdopen: %s", strerror(c));
649 }
650 inplace = 1;
651 }
652
653 while (fgets(line, sizeof(line), in)) {
654 num++;
655 i = strlen(line) - 1;
656 if (line[i] != '\n') {
657 error("line %d too long: %.40s...", num, line);
658 skip = 1;
659 invalid = 1;
660 continue;
661 }
662 if (skip) {
663 skip = 0;
664 continue;
665 }
666 line[i] = '\0';
667
668 /* Skip leading whitespace, empty and comment lines. */
669 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
670 ;
671 if (!*cp || *cp == '\n' || *cp == '#') {
672 if (inplace)
673 fprintf(out, "%s\n", cp);
674 continue;
675 }
676 /* Find the end of the host name portion. */
677 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
678 ;
679 if (*kp == '\0' || *(kp + 1) == '\0') {
680 error("line %d missing key: %.40s...",
681 num, line);
682 invalid = 1;
683 continue;
684 }
685 *kp++ = '\0';
686 kp2 = kp;
687
688 public = key_new(KEY_RSA1);
689 if (key_read(public, &kp) != 1) {
690 kp = kp2;
691 key_free(public);
692 public = key_new(KEY_UNSPEC);
693 if (key_read(public, &kp) != 1) {
694 error("line %d invalid key: %.40s...",
695 num, line);
696 key_free(public);
697 invalid = 1;
698 continue;
699 }
700 }
701
702 if (*cp == HASH_DELIM) {
703 if (find_host || delete_host) {
704 cp2 = host_hash(name, cp, strlen(cp));
705 if (cp2 == NULL) {
706 error("line %d: invalid hashed "
707 "name: %.64s...", num, line);
708 invalid = 1;
709 continue;
710 }
711 c = (strcmp(cp2, cp) == 0);
712 if (find_host && c) {
713 printf("# Host %s found: "
714 "line %d type %s\n", name,
715 num, key_type(public));
716 print_host(out, cp, public, 0);
717 }
718 if (delete_host && !c)
719 print_host(out, cp, public, 0);
720 } else if (hash_hosts)
721 print_host(out, cp, public, 0);
722 } else {
723 if (find_host || delete_host) {
724 c = (match_hostname(name, cp,
725 strlen(cp)) == 1);
726 if (find_host && c) {
727 printf("# Host %s found: "
728 "line %d type %s\n", name,
729 num, key_type(public));
730 print_host(out, cp, public, hash_hosts);
731 }
732 if (delete_host && !c)
733 print_host(out, cp, public, 0);
734 } else if (hash_hosts) {
735 for (cp2 = strsep(&cp, ",");
736 cp2 != NULL && *cp2 != '\0';
737 cp2 = strsep(&cp, ",")) {
738 if (strcspn(cp2, "*?!") != strlen(cp2))
739 fprintf(stderr, "Warning: "
740 "ignoring host name with "
741 "metacharacters: %.64s\n",
742 cp2);
743 else
744 print_host(out, cp2, public, 1);
745 }
746 has_unhashed = 1;
747 }
748 }
749 key_free(public);
750 }
751 fclose(in);
752
753 if (invalid) {
754 fprintf(stderr, "%s is not a valid known_host file.\n",
755 identity_file);
756 if (inplace) {
757 fprintf(stderr, "Not replacing existing known_hosts "
758 "file because of errors\n");
759 fclose(out);
760 unlink(tmp);
761 }
762 exit(1);
763 }
764
765 if (inplace) {
766 fclose(out);
767
768 /* Backup existing file */
769 if (unlink(old) == -1 && errno != ENOENT)
770 fatal("unlink %.100s: %s", old, strerror(errno));
771 if (link(identity_file, old) == -1)
772 fatal("link %.100s to %.100s: %s", identity_file, old,
773 strerror(errno));
774 /* Move new one into place */
775 if (rename(tmp, identity_file) == -1) {
776 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
777 strerror(errno));
778 unlink(tmp);
779 unlink(old);
780 exit(1);
781 }
782
783 fprintf(stderr, "%s updated.\n", identity_file);
784 fprintf(stderr, "Original contents retained as %s\n", old);
785 if (has_unhashed) {
786 fprintf(stderr, "WARNING: %s contains unhashed "
787 "entries\n", old);
788 fprintf(stderr, "Delete this file to ensure privacy "
789 "of hostnames\n");
790 }
791 }
792
793 exit(0);
794 }
795
796 /*
797 * Perform changing a passphrase. The argument is the passwd structure
798 * for the current user.
799 */
800 static void
801 do_change_passphrase(struct passwd *pw)
802 {
803 char *comment;
804 char *old_passphrase, *passphrase1, *passphrase2;
805 struct stat st;
806 Key *private;
807
808 if (!have_identity)
809 ask_filename(pw, "Enter file in which the key is");
810 if (stat(identity_file, &st) < 0) {
811 perror(identity_file);
812 exit(1);
813 }
814 /* Try to load the file with empty passphrase. */
815 private = key_load_private(identity_file, "", &comment);
816 if (private == NULL) {
817 if (identity_passphrase)
818 old_passphrase = xstrdup(identity_passphrase);
819 else
820 old_passphrase =
821 read_passphrase("Enter old passphrase: ",
822 RP_ALLOW_STDIN);
823 private = key_load_private(identity_file, old_passphrase,
824 &comment);
825 memset(old_passphrase, 0, strlen(old_passphrase));
826 xfree(old_passphrase);
827 if (private == NULL) {
828 printf("Bad passphrase.\n");
829 exit(1);
830 }
831 }
832 printf("Key has comment '%s'\n", comment);
833
834 /* Ask the new passphrase (twice). */
835 if (identity_new_passphrase) {
836 passphrase1 = xstrdup(identity_new_passphrase);
837 passphrase2 = NULL;
838 } else {
839 passphrase1 =
840 read_passphrase("Enter new passphrase (empty for no "
841 "passphrase): ", RP_ALLOW_STDIN);
842 passphrase2 = read_passphrase("Enter same passphrase again: ",
843 RP_ALLOW_STDIN);
844
845 /* Verify that they are the same. */
846 if (strcmp(passphrase1, passphrase2) != 0) {
847 memset(passphrase1, 0, strlen(passphrase1));
848 memset(passphrase2, 0, strlen(passphrase2));
849 xfree(passphrase1);
850 xfree(passphrase2);
851 printf("Pass phrases do not match. Try again.\n");
852 exit(1);
853 }
854 /* Destroy the other copy. */
855 memset(passphrase2, 0, strlen(passphrase2));
856 xfree(passphrase2);
857 }
858
859 /* Save the file using the new passphrase. */
860 if (!key_save_private(private, identity_file, passphrase1, comment)) {
861 printf("Saving the key failed: %s.\n", identity_file);
862 memset(passphrase1, 0, strlen(passphrase1));
863 xfree(passphrase1);
864 key_free(private);
865 xfree(comment);
866 exit(1);
867 }
868 /* Destroy the passphrase and the copy of the key in memory. */
869 memset(passphrase1, 0, strlen(passphrase1));
870 xfree(passphrase1);
871 key_free(private); /* Destroys contents */
872 xfree(comment);
873
874 printf("Your identification has been saved with the new passphrase.\n");
875 exit(0);
876 }
877
878 /*
879 * Print the SSHFP RR.
880 */
881 static int
882 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
883 {
884 Key *public;
885 char *comment = NULL;
886 struct stat st;
887
888 if (fname == NULL)
889 ask_filename(pw, "Enter file in which the key is");
890 if (stat(fname, &st) < 0) {
891 if (errno == ENOENT)
892 return 0;
893 perror(fname);
894 exit(1);
895 }
896 public = key_load_public(fname, &comment);
897 if (public != NULL) {
898 export_dns_rr(hname, public, stdout, print_generic);
899 key_free(public);
900 xfree(comment);
901 return 1;
902 }
903 if (comment)
904 xfree(comment);
905
906 printf("failed to read v2 public key from %s.\n", fname);
907 exit(1);
908 }
909
910 /*
911 * Change the comment of a private key file.
912 */
913 static void
914 do_change_comment(struct passwd *pw)
915 {
916 char new_comment[1024], *comment, *passphrase;
917 Key *private;
918 Key *public;
919 struct stat st;
920 FILE *f;
921 int fd;
922
923 if (!have_identity)
924 ask_filename(pw, "Enter file in which the key is");
925 if (stat(identity_file, &st) < 0) {
926 perror(identity_file);
927 exit(1);
928 }
929 private = key_load_private(identity_file, "", &comment);
930 if (private == NULL) {
931 if (identity_passphrase)
932 passphrase = xstrdup(identity_passphrase);
933 else if (identity_new_passphrase)
934 passphrase = xstrdup(identity_new_passphrase);
935 else
936 passphrase = read_passphrase("Enter passphrase: ",
937 RP_ALLOW_STDIN);
938 /* Try to load using the passphrase. */
939 private = key_load_private(identity_file, passphrase, &comment);
940 if (private == NULL) {
941 memset(passphrase, 0, strlen(passphrase));
942 xfree(passphrase);
943 printf("Bad passphrase.\n");
944 exit(1);
945 }
946 } else {
947 passphrase = xstrdup("");
948 }
949 if (private->type != KEY_RSA1) {
950 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
951 key_free(private);
952 exit(1);
953 }
954 printf("Key now has comment '%s'\n", comment);
955
956 if (identity_comment) {
957 strlcpy(new_comment, identity_comment, sizeof(new_comment));
958 } else {
959 printf("Enter new comment: ");
960 fflush(stdout);
961 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
962 memset(passphrase, 0, strlen(passphrase));
963 key_free(private);
964 exit(1);
965 }
966 if (strchr(new_comment, '\n'))
967 *strchr(new_comment, '\n') = 0;
968 }
969
970 /* Save the file using the new passphrase. */
971 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
972 printf("Saving the key failed: %s.\n", identity_file);
973 memset(passphrase, 0, strlen(passphrase));
974 xfree(passphrase);
975 key_free(private);
976 xfree(comment);
977 exit(1);
978 }
979 memset(passphrase, 0, strlen(passphrase));
980 xfree(passphrase);
981 public = key_from_private(private);
982 key_free(private);
983
984 strlcat(identity_file, ".pub", sizeof(identity_file));
985 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
986 if (fd == -1) {
987 printf("Could not save your public key in %s\n", identity_file);
988 exit(1);
989 }
990 f = fdopen(fd, "w");
991 if (f == NULL) {
992 printf("fdopen %s failed", identity_file);
993 exit(1);
994 }
995 if (!key_write(public, f))
996 fprintf(stderr, "write key failed");
997 key_free(public);
998 fprintf(f, " %s\n", new_comment);
999 fclose(f);
1000
1001 xfree(comment);
1002
1003 printf("The comment in your key file has been changed.\n");
1004 exit(0);
1005 }
1006
1007 static void
1008 usage(void)
1009 {
1010 fprintf(stderr, "Usage: %s [options]\n", __progname);
1011 fprintf(stderr, "Options:\n");
1012 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1013 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1014 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1015 fprintf(stderr, " -C comment Provide new comment.\n");
1016 fprintf(stderr, " -c Change comment in private and public key files.\n");
1017 #ifdef SMARTCARD
1018 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1019 #endif /* SMARTCARD */
1020 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
1021 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1022 fprintf(stderr, " -f filename Filename of the key file.\n");
1023 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1024 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1025 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1026 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
1027 fprintf(stderr, " -l Show fingerprint of key file.\n");
1028 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1029 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1030 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1031 fprintf(stderr, " -p Change passphrase of private key file.\n");
1032 fprintf(stderr, " -q Quiet.\n");
1033 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1034 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1035 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1036 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1037 fprintf(stderr, " -t type Specify type of key to create.\n");
1038 #ifdef SMARTCARD
1039 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1040 #endif /* SMARTCARD */
1041 fprintf(stderr, " -v Verbose.\n");
1042 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1043 fprintf(stderr, " -y Read private key file and print public key.\n");
1044
1045 exit(1);
1046 }
1047
1048 /*
1049 * Main program for key management.
1050 */
1051 int
1052 main(int ac, char **av)
1053 {
1054 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1055 char out_file[MAXPATHLEN], *reader_id = NULL;
1056 char *rr_hostname = NULL;
1057 Key *private, *public;
1058 struct passwd *pw;
1059 struct stat st;
1060 int opt, type, fd, download = 0;
1061 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1062 int do_gen_candidates = 0, do_screen_candidates = 0;
1063 int log_level = SYSLOG_LEVEL_INFO;
1064 BIGNUM *start = NULL;
1065 FILE *f;
1066 const char *errstr;
1067
1068 extern int optind;
1069 extern char *optarg;
1070
1071 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1072 sanitise_stdfd();
1073
1074 __progname = ssh_get_progname(av[0]);
1075
1076 SSLeay_add_all_algorithms();
1077 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1078
1079 init_rng();
1080 seed_rng();
1081
1082 /* we need this for the home * directory. */
1083 pw = getpwuid(getuid());
1084 if (!pw) {
1085 printf("You don't exist, go away!\n");
1086 exit(1);
1087 }
1088 if (gethostname(hostname, sizeof(hostname)) < 0) {
1089 perror("gethostname");
1090 exit(1);
1091 }
1092
1093 while ((opt = getopt(ac, av,
1094 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1095 switch (opt) {
1096 case 'b':
1097 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1098 if (errstr)
1099 fatal("Bits has bad value %s (%s)",
1100 optarg, errstr);
1101 break;
1102 case 'F':
1103 find_host = 1;
1104 rr_hostname = optarg;
1105 break;
1106 case 'H':
1107 hash_hosts = 1;
1108 break;
1109 case 'R':
1110 delete_host = 1;
1111 rr_hostname = optarg;
1112 break;
1113 case 'l':
1114 print_fingerprint = 1;
1115 break;
1116 case 'B':
1117 print_bubblebabble = 1;
1118 break;
1119 case 'p':
1120 change_passphrase = 1;
1121 break;
1122 case 'c':
1123 change_comment = 1;
1124 break;
1125 case 'f':
1126 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1127 sizeof(identity_file))
1128 fatal("Identity filename too long");
1129 have_identity = 1;
1130 break;
1131 case 'g':
1132 print_generic = 1;
1133 break;
1134 case 'P':
1135 identity_passphrase = optarg;
1136 break;
1137 case 'N':
1138 identity_new_passphrase = optarg;
1139 break;
1140 case 'C':
1141 identity_comment = optarg;
1142 break;
1143 case 'q':
1144 quiet = 1;
1145 break;
1146 case 'e':
1147 case 'x':
1148 /* export key */
1149 convert_to_ssh2 = 1;
1150 break;
1151 case 'i':
1152 case 'X':
1153 /* import key */
1154 convert_from_ssh2 = 1;
1155 break;
1156 case 'y':
1157 print_public = 1;
1158 break;
1159 case 'd':
1160 key_type_name = "dsa";
1161 break;
1162 case 't':
1163 key_type_name = optarg;
1164 break;
1165 case 'D':
1166 download = 1;
1167 /*FALLTHROUGH*/
1168 case 'U':
1169 reader_id = optarg;
1170 break;
1171 case 'v':
1172 if (log_level == SYSLOG_LEVEL_INFO)
1173 log_level = SYSLOG_LEVEL_DEBUG1;
1174 else {
1175 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1176 log_level < SYSLOG_LEVEL_DEBUG3)
1177 log_level++;
1178 }
1179 break;
1180 case 'r':
1181 rr_hostname = optarg;
1182 break;
1183 case 'W':
1184 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1185 UINT_MAX, &errstr);
1186 if (errstr)
1187 fatal("Desired generator has bad value: %s (%s)",
1188 optarg, errstr);
1189 break;
1190 case 'a':
1191 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1192 if (errstr)
1193 fatal("Invalid number of trials: %s (%s)",
1194 optarg, errstr);
1195 break;
1196 case 'M':
1197 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1198 if (errstr) {
1199 fatal("Memory limit is %s: %s", errstr, optarg);
1200 }
1201 break;
1202 case 'G':
1203 do_gen_candidates = 1;
1204 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1205 sizeof(out_file))
1206 fatal("Output filename too long");
1207 break;
1208 case 'T':
1209 do_screen_candidates = 1;
1210 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1211 sizeof(out_file))
1212 fatal("Output filename too long");
1213 break;
1214 case 'S':
1215 /* XXX - also compare length against bits */
1216 if (BN_hex2bn(&start, optarg) == 0)
1217 fatal("Invalid start point.");
1218 break;
1219 case '?':
1220 default:
1221 usage();
1222 }
1223 }
1224
1225 /* reinit */
1226 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
1227
1228 if (optind < ac) {
1229 printf("Too many arguments.\n");
1230 usage();
1231 }
1232 if (change_passphrase && change_comment) {
1233 printf("Can only have one of -p and -c.\n");
1234 usage();
1235 }
1236 if (delete_host || hash_hosts || find_host)
1237 do_known_hosts(pw, rr_hostname);
1238 if (print_fingerprint || print_bubblebabble)
1239 do_fingerprint(pw);
1240 if (change_passphrase)
1241 do_change_passphrase(pw);
1242 if (change_comment)
1243 do_change_comment(pw);
1244 if (convert_to_ssh2)
1245 do_convert_to_ssh2(pw);
1246 if (convert_from_ssh2)
1247 do_convert_from_ssh2(pw);
1248 if (print_public)
1249 do_print_public(pw);
1250 if (rr_hostname != NULL) {
1251 unsigned int n = 0;
1252
1253 if (have_identity) {
1254 n = do_print_resource_record(pw,
1255 identity_file, rr_hostname);
1256 if (n == 0) {
1257 perror(identity_file);
1258 exit(1);
1259 }
1260 exit(0);
1261 } else {
1262
1263 n += do_print_resource_record(pw,
1264 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1265 n += do_print_resource_record(pw,
1266 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1267
1268 if (n == 0)
1269 fatal("no keys found.");
1270 exit(0);
1271 }
1272 }
1273 if (reader_id != NULL) {
1274 #ifdef SMARTCARD
1275 if (download)
1276 do_download(pw, reader_id);
1277 else
1278 do_upload(pw, reader_id);
1279 #else /* SMARTCARD */
1280 fatal("no support for smartcards.");
1281 #endif /* SMARTCARD */
1282 }
1283
1284 if (do_gen_candidates) {
1285 FILE *out = fopen(out_file, "w");
1286
1287 if (out == NULL) {
1288 error("Couldn't open modulus candidate file \"%s\": %s",
1289 out_file, strerror(errno));
1290 return (1);
1291 }
1292 if (bits == 0)
1293 bits = DEFAULT_BITS;
1294 if (gen_candidates(out, memory, bits, start) != 0)
1295 fatal("modulus candidate generation failed");
1296
1297 return (0);
1298 }
1299
1300 if (do_screen_candidates) {
1301 FILE *in;
1302 FILE *out = fopen(out_file, "w");
1303
1304 if (have_identity && strcmp(identity_file, "-") != 0) {
1305 if ((in = fopen(identity_file, "r")) == NULL) {
1306 fatal("Couldn't open modulus candidate "
1307 "file \"%s\": %s", identity_file,
1308 strerror(errno));
1309 }
1310 } else
1311 in = stdin;
1312
1313 if (out == NULL) {
1314 fatal("Couldn't open moduli file \"%s\": %s",
1315 out_file, strerror(errno));
1316 }
1317 if (prime_test(in, out, trials, generator_wanted) != 0)
1318 fatal("modulus screening failed");
1319 return (0);
1320 }
1321
1322 arc4random_stir();
1323
1324 if (key_type_name == NULL)
1325 key_type_name = "rsa";
1326
1327 type = key_type_from_name(key_type_name);
1328 if (type == KEY_UNSPEC) {
1329 fprintf(stderr, "unknown key type %s\n", key_type_name);
1330 exit(1);
1331 }
1332 if (bits == 0)
1333 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1334 if (type == KEY_DSA && bits != 1024)
1335 fatal("DSA keys must be 1024 bits");
1336 if (!quiet)
1337 printf("Generating public/private %s key pair.\n", key_type_name);
1338 private = key_generate(type, bits);
1339 if (private == NULL) {
1340 fprintf(stderr, "key_generate failed");
1341 exit(1);
1342 }
1343 public = key_from_private(private);
1344
1345 if (!have_identity)
1346 ask_filename(pw, "Enter file in which to save the key");
1347
1348 /* Create ~/.ssh directory if it doesn't already exist. */
1349 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1350 if (strstr(identity_file, dotsshdir) != NULL &&
1351 stat(dotsshdir, &st) < 0) {
1352 if (mkdir(dotsshdir, 0700) < 0)
1353 error("Could not create directory '%s'.", dotsshdir);
1354 else if (!quiet)
1355 printf("Created directory '%s'.\n", dotsshdir);
1356 }
1357 /* If the file already exists, ask the user to confirm. */
1358 if (stat(identity_file, &st) >= 0) {
1359 char yesno[3];
1360 printf("%s already exists.\n", identity_file);
1361 printf("Overwrite (y/n)? ");
1362 fflush(stdout);
1363 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1364 exit(1);
1365 if (yesno[0] != 'y' && yesno[0] != 'Y')
1366 exit(1);
1367 }
1368 /* Ask for a passphrase (twice). */
1369 if (identity_passphrase)
1370 passphrase1 = xstrdup(identity_passphrase);
1371 else if (identity_new_passphrase)
1372 passphrase1 = xstrdup(identity_new_passphrase);
1373 else {
1374 passphrase_again:
1375 passphrase1 =
1376 read_passphrase("Enter passphrase (empty for no "
1377 "passphrase): ", RP_ALLOW_STDIN);
1378 passphrase2 = read_passphrase("Enter same passphrase again: ",
1379 RP_ALLOW_STDIN);
1380 if (strcmp(passphrase1, passphrase2) != 0) {
1381 /*
1382 * The passphrases do not match. Clear them and
1383 * retry.
1384 */
1385 memset(passphrase1, 0, strlen(passphrase1));
1386 memset(passphrase2, 0, strlen(passphrase2));
1387 xfree(passphrase1);
1388 xfree(passphrase2);
1389 printf("Passphrases do not match. Try again.\n");
1390 goto passphrase_again;
1391 }
1392 /* Clear the other copy of the passphrase. */
1393 memset(passphrase2, 0, strlen(passphrase2));
1394 xfree(passphrase2);
1395 }
1396
1397 if (identity_comment) {
1398 strlcpy(comment, identity_comment, sizeof(comment));
1399 } else {
1400 /* Create default commend field for the passphrase. */
1401 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1402 }
1403
1404 /* Save the key with the given passphrase and comment. */
1405 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1406 printf("Saving the key failed: %s.\n", identity_file);
1407 memset(passphrase1, 0, strlen(passphrase1));
1408 xfree(passphrase1);
1409 exit(1);
1410 }
1411 /* Clear the passphrase. */
1412 memset(passphrase1, 0, strlen(passphrase1));
1413 xfree(passphrase1);
1414
1415 /* Clear the private key and the random number generator. */
1416 key_free(private);
1417 arc4random_stir();
1418
1419 if (!quiet)
1420 printf("Your identification has been saved in %s.\n", identity_file);
1421
1422 strlcat(identity_file, ".pub", sizeof(identity_file));
1423 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1424 if (fd == -1) {
1425 printf("Could not save your public key in %s\n", identity_file);
1426 exit(1);
1427 }
1428 f = fdopen(fd, "w");
1429 if (f == NULL) {
1430 printf("fdopen %s failed", identity_file);
1431 exit(1);
1432 }
1433 if (!key_write(public, f))
1434 fprintf(stderr, "write key failed");
1435 fprintf(f, " %s\n", comment);
1436 fclose(f);
1437
1438 if (!quiet) {
1439 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1440 printf("Your public key has been saved in %s.\n",
1441 identity_file);
1442 printf("The key fingerprint is:\n");
1443 printf("%s %s\n", fp, comment);
1444 xfree(fp);
1445 }
1446
1447 key_free(public);
1448 exit(0);
1449 }
DragonFly BSD