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[dragonfly.git] / crypto / openssh-5 / ssh-keygen.c
blob69b16e6f50e2ffe4ef8410b4cee772fe24d3930b
1 /* $OpenBSD: ssh-keygen.c,v 1.165 2008/01/19 22:37:19 djm 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 #include "openbsd-compat/openssl-compat.h"
25
26 #include <errno.h>
27 #include <fcntl.h>
28 #include <netdb.h>
29 #ifdef HAVE_PATHS_H
30 # include <paths.h>
31 #endif
32 #include <pwd.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 #include "xmalloc.h"
40 #include "key.h"
41 #include "rsa.h"
42 #include "authfile.h"
43 #include "uuencode.h"
44 #include "buffer.h"
45 #include "pathnames.h"
46 #include "log.h"
47 #include "misc.h"
48 #include "match.h"
49 #include "hostfile.h"
50 #include "dns.h"
51
52 #ifdef SMARTCARD
53 #include "scard.h"
54 #endif
55
56 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
57 #define DEFAULT_BITS 2048
58 #define DEFAULT_BITS_DSA 1024
59 u_int32_t bits = 0;
60
61 /*
62 * Flag indicating that we just want to change the passphrase. This can be
63 * set on the command line.
64 */
65 int change_passphrase = 0;
66
67 /*
68 * Flag indicating that we just want to change the comment. This can be set
69 * on the command line.
70 */
71 int change_comment = 0;
72
73 int quiet = 0;
74
75 /* Flag indicating that we want to hash a known_hosts file */
76 int hash_hosts = 0;
77 /* Flag indicating that we want lookup a host in known_hosts file */
78 int find_host = 0;
79 /* Flag indicating that we want to delete a host from a known_hosts file */
80 int delete_host = 0;
81
82 /* Flag indicating that we just want to see the key fingerprint */
83 int print_fingerprint = 0;
84 int print_bubblebabble = 0;
85
86 /* The identity file name, given on the command line or entered by the user. */
87 char identity_file[1024];
88 int have_identity = 0;
89
90 /* This is set to the passphrase if given on the command line. */
91 char *identity_passphrase = NULL;
92
93 /* This is set to the new passphrase if given on the command line. */
94 char *identity_new_passphrase = NULL;
95
96 /* This is set to the new comment if given on the command line. */
97 char *identity_comment = NULL;
98
99 /* Dump public key file in format used by real and the original SSH 2 */
100 int convert_to_ssh2 = 0;
101 int convert_from_ssh2 = 0;
102 int print_public = 0;
103 int print_generic = 0;
104
105 char *key_type_name = NULL;
106
107 /* argv0 */
108 extern char *__progname;
109
110 char hostname[MAXHOSTNAMELEN];
111
112 /* moduli.c */
113 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
114 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
115
116 static void
117 ask_filename(struct passwd *pw, const char *prompt)
118 {
119 char buf[1024];
120 char *name = NULL;
121
122 if (key_type_name == NULL)
123 name = _PATH_SSH_CLIENT_ID_RSA;
124 else {
125 switch (key_type_from_name(key_type_name)) {
126 case KEY_RSA1:
127 name = _PATH_SSH_CLIENT_IDENTITY;
128 break;
129 case KEY_DSA:
130 name = _PATH_SSH_CLIENT_ID_DSA;
131 break;
132 case KEY_RSA:
133 name = _PATH_SSH_CLIENT_ID_RSA;
134 break;
135 default:
136 fprintf(stderr, "bad key type");
137 exit(1);
138 break;
139 }
140 }
141 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
142 fprintf(stderr, "%s (%s): ", prompt, identity_file);
143 if (fgets(buf, sizeof(buf), stdin) == NULL)
144 exit(1);
145 buf[strcspn(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 /* We reached EOF */
350 return -1;
351 }
352
353 static void
354 do_convert_from_ssh2(struct passwd *pw)
355 {
356 Key *k;
357 int blen;
358 u_int len;
359 char line[1024];
360 u_char blob[8096];
361 char encoded[8096];
362 struct stat st;
363 int escaped = 0, private = 0, ok;
364 FILE *fp;
365
366 if (!have_identity)
367 ask_filename(pw, "Enter file in which the key is");
368 if (stat(identity_file, &st) < 0) {
369 perror(identity_file);
370 exit(1);
371 }
372 fp = fopen(identity_file, "r");
373 if (fp == NULL) {
374 perror(identity_file);
375 exit(1);
376 }
377 encoded[0] = '\0';
378 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
379 if (line[blen - 1] == '\\')
380 escaped++;
381 if (strncmp(line, "----", 4) == 0 ||
382 strstr(line, ": ") != NULL) {
383 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
384 private = 1;
385 if (strstr(line, " END ") != NULL) {
386 break;
387 }
388 /* fprintf(stderr, "ignore: %s", line); */
389 continue;
390 }
391 if (escaped) {
392 escaped--;
393 /* fprintf(stderr, "escaped: %s", line); */
394 continue;
395 }
396 strlcat(encoded, line, sizeof(encoded));
397 }
398 len = strlen(encoded);
399 if (((len % 4) == 3) &&
400 (encoded[len-1] == '=') &&
401 (encoded[len-2] == '=') &&
402 (encoded[len-3] == '='))
403 encoded[len-3] = '\0';
404 blen = uudecode(encoded, blob, sizeof(blob));
405 if (blen < 0) {
406 fprintf(stderr, "uudecode failed.\n");
407 exit(1);
408 }
409 k = private ?
410 do_convert_private_ssh2_from_blob(blob, blen) :
411 key_from_blob(blob, blen);
412 if (k == NULL) {
413 fprintf(stderr, "decode blob failed.\n");
414 exit(1);
415 }
416 ok = private ?
417 (k->type == KEY_DSA ?
418 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
419 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
420 key_write(k, stdout);
421 if (!ok) {
422 fprintf(stderr, "key write failed");
423 exit(1);
424 }
425 key_free(k);
426 if (!private)
427 fprintf(stdout, "\n");
428 fclose(fp);
429 exit(0);
430 }
431
432 static void
433 do_print_public(struct passwd *pw)
434 {
435 Key *prv;
436 struct stat st;
437
438 if (!have_identity)
439 ask_filename(pw, "Enter file in which the key is");
440 if (stat(identity_file, &st) < 0) {
441 perror(identity_file);
442 exit(1);
443 }
444 prv = load_identity(identity_file);
445 if (prv == NULL) {
446 fprintf(stderr, "load failed\n");
447 exit(1);
448 }
449 if (!key_write(prv, stdout))
450 fprintf(stderr, "key_write failed");
451 key_free(prv);
452 fprintf(stdout, "\n");
453 exit(0);
454 }
455
456 #ifdef SMARTCARD
457 static void
458 do_upload(struct passwd *pw, const char *sc_reader_id)
459 {
460 Key *prv = NULL;
461 struct stat st;
462 int ret;
463
464 if (!have_identity)
465 ask_filename(pw, "Enter file in which the key is");
466 if (stat(identity_file, &st) < 0) {
467 perror(identity_file);
468 exit(1);
469 }
470 prv = load_identity(identity_file);
471 if (prv == NULL) {
472 error("load failed");
473 exit(1);
474 }
475 ret = sc_put_key(prv, sc_reader_id);
476 key_free(prv);
477 if (ret < 0)
478 exit(1);
479 logit("loading key done");
480 exit(0);
481 }
482
483 static void
484 do_download(struct passwd *pw, const char *sc_reader_id)
485 {
486 Key **keys = NULL;
487 int i;
488
489 keys = sc_get_keys(sc_reader_id, NULL);
490 if (keys == NULL)
491 fatal("cannot read public key from smartcard");
492 for (i = 0; keys[i]; i++) {
493 key_write(keys[i], stdout);
494 key_free(keys[i]);
495 fprintf(stdout, "\n");
496 }
497 xfree(keys);
498 exit(0);
499 }
500 #endif /* SMARTCARD */
501
502 static void
503 do_fingerprint(struct passwd *pw)
504 {
505 FILE *f;
506 Key *public;
507 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
508 int i, skip = 0, num = 0, invalid = 1;
509 enum fp_rep rep;
510 enum fp_type fptype;
511 struct stat st;
512
513 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
514 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
515
516 if (!have_identity)
517 ask_filename(pw, "Enter file in which the key is");
518 if (stat(identity_file, &st) < 0) {
519 perror(identity_file);
520 exit(1);
521 }
522 public = key_load_public(identity_file, &comment);
523 if (public != NULL) {
524 fp = key_fingerprint(public, fptype, rep);
525 printf("%u %s %s\n", key_size(public), fp, comment);
526 key_free(public);
527 xfree(comment);
528 xfree(fp);
529 exit(0);
530 }
531 if (comment) {
532 xfree(comment);
533 comment = NULL;
534 }
535
536 f = fopen(identity_file, "r");
537 if (f != NULL) {
538 while (fgets(line, sizeof(line), f)) {
539 if ((cp = strchr(line, '\n')) == NULL) {
540 error("line %d too long: %.40s...",
541 num + 1, line);
542 skip = 1;
543 continue;
544 }
545 num++;
546 if (skip) {
547 skip = 0;
548 continue;
549 }
550 *cp = '\0';
551
552 /* Skip leading whitespace, empty and comment lines. */
553 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
554 ;
555 if (!*cp || *cp == '\n' || *cp == '#')
556 continue;
557 i = strtol(cp, &ep, 10);
558 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
559 int quoted = 0;
560 comment = cp;
561 for (; *cp && (quoted || (*cp != ' ' &&
562 *cp != '\t')); cp++) {
563 if (*cp == '\\' && cp[1] == '"')
564 cp++; /* Skip both */
565 else if (*cp == '"')
566 quoted = !quoted;
567 }
568 if (!*cp)
569 continue;
570 *cp++ = '\0';
571 }
572 ep = cp;
573 public = key_new(KEY_RSA1);
574 if (key_read(public, &cp) != 1) {
575 cp = ep;
576 key_free(public);
577 public = key_new(KEY_UNSPEC);
578 if (key_read(public, &cp) != 1) {
579 key_free(public);
580 continue;
581 }
582 }
583 comment = *cp ? cp : comment;
584 fp = key_fingerprint(public, fptype, rep);
585 printf("%u %s %s\n", key_size(public), fp,
586 comment ? comment : "no comment");
587 xfree(fp);
588 key_free(public);
589 invalid = 0;
590 }
591 fclose(f);
592 }
593 if (invalid) {
594 printf("%s is not a public key file.\n", identity_file);
595 exit(1);
596 }
597 exit(0);
598 }
599
600 static void
601 print_host(FILE *f, const char *name, Key *public, int hash)
602 {
603 if (hash && (name = host_hash(name, NULL, 0)) == NULL)
604 fatal("hash_host failed");
605 fprintf(f, "%s ", name);
606 if (!key_write(public, f))
607 fatal("key_write failed");
608 fprintf(f, "\n");
609 }
610
611 static void
612 do_known_hosts(struct passwd *pw, const char *name)
613 {
614 FILE *in, *out = stdout;
615 Key *public;
616 char *cp, *cp2, *kp, *kp2;
617 char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN];
618 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
619
620 if (!have_identity) {
621 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
622 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
623 sizeof(identity_file))
624 fatal("Specified known hosts path too long");
625 xfree(cp);
626 have_identity = 1;
627 }
628 if ((in = fopen(identity_file, "r")) == NULL)
629 fatal("fopen: %s", strerror(errno));
630
631 /*
632 * Find hosts goes to stdout, hash and deletions happen in-place
633 * A corner case is ssh-keygen -HF foo, which should go to stdout
634 */
635 if (!find_host && (hash_hosts || delete_host)) {
636 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
637 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
638 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
639 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
640 fatal("known_hosts path too long");
641 umask(077);
642 if ((c = mkstemp(tmp)) == -1)
643 fatal("mkstemp: %s", strerror(errno));
644 if ((out = fdopen(c, "w")) == NULL) {
645 c = errno;
646 unlink(tmp);
647 fatal("fdopen: %s", strerror(c));
648 }
649 inplace = 1;
650 }
651
652 while (fgets(line, sizeof(line), in)) {
653 if ((cp = strchr(line, '\n')) == NULL) {
654 error("line %d too long: %.40s...", num + 1, line);
655 skip = 1;
656 invalid = 1;
657 continue;
658 }
659 num++;
660 if (skip) {
661 skip = 0;
662 continue;
663 }
664 *cp = '\0';
665
666 /* Skip leading whitespace, empty and comment lines. */
667 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
668 ;
669 if (!*cp || *cp == '\n' || *cp == '#') {
670 if (inplace)
671 fprintf(out, "%s\n", cp);
672 continue;
673 }
674 /* Find the end of the host name portion. */
675 for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++)
676 ;
677 if (*kp == '\0' || *(kp + 1) == '\0') {
678 error("line %d missing key: %.40s...",
679 num, line);
680 invalid = 1;
681 continue;
682 }
683 *kp++ = '\0';
684 kp2 = kp;
685
686 public = key_new(KEY_RSA1);
687 if (key_read(public, &kp) != 1) {
688 kp = kp2;
689 key_free(public);
690 public = key_new(KEY_UNSPEC);
691 if (key_read(public, &kp) != 1) {
692 error("line %d invalid key: %.40s...",
693 num, line);
694 key_free(public);
695 invalid = 1;
696 continue;
697 }
698 }
699
700 if (*cp == HASH_DELIM) {
701 if (find_host || delete_host) {
702 cp2 = host_hash(name, cp, strlen(cp));
703 if (cp2 == NULL) {
704 error("line %d: invalid hashed "
705 "name: %.64s...", num, line);
706 invalid = 1;
707 continue;
708 }
709 c = (strcmp(cp2, cp) == 0);
710 if (find_host && c) {
711 printf("# Host %s found: "
712 "line %d type %s\n", name,
713 num, key_type(public));
714 print_host(out, cp, public, 0);
715 }
716 if (delete_host && !c)
717 print_host(out, cp, public, 0);
718 } else if (hash_hosts)
719 print_host(out, cp, public, 0);
720 } else {
721 if (find_host || delete_host) {
722 c = (match_hostname(name, cp,
723 strlen(cp)) == 1);
724 if (find_host && c) {
725 printf("# Host %s found: "
726 "line %d type %s\n", name,
727 num, key_type(public));
728 print_host(out, name, public,
729 hash_hosts);
730 }
731 if (delete_host && !c)
732 print_host(out, cp, public, 0);
733 } else if (hash_hosts) {
734 for (cp2 = strsep(&cp, ",");
735 cp2 != NULL && *cp2 != '\0';
736 cp2 = strsep(&cp, ",")) {
737 if (strcspn(cp2, "*?!") != strlen(cp2))
738 fprintf(stderr, "Warning: "
739 "ignoring host name with "
740 "metacharacters: %.64s\n",
741 cp2);
742 else
743 print_host(out, cp2, public, 1);
744 }
745 has_unhashed = 1;
746 }
747 }
748 key_free(public);
749 }
750 fclose(in);
751
752 if (invalid) {
753 fprintf(stderr, "%s is not a valid known_hosts file.\n",
754 identity_file);
755 if (inplace) {
756 fprintf(stderr, "Not replacing existing known_hosts "
757 "file because of errors\n");
758 fclose(out);
759 unlink(tmp);
760 }
761 exit(1);
762 }
763
764 if (inplace) {
765 fclose(out);
766
767 /* Backup existing file */
768 if (unlink(old) == -1 && errno != ENOENT)
769 fatal("unlink %.100s: %s", old, strerror(errno));
770 if (link(identity_file, old) == -1)
771 fatal("link %.100s to %.100s: %s", identity_file, old,
772 strerror(errno));
773 /* Move new one into place */
774 if (rename(tmp, identity_file) == -1) {
775 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
776 strerror(errno));
777 unlink(tmp);
778 unlink(old);
779 exit(1);
780 }
781
782 fprintf(stderr, "%s updated.\n", identity_file);
783 fprintf(stderr, "Original contents retained as %s\n", old);
784 if (has_unhashed) {
785 fprintf(stderr, "WARNING: %s contains unhashed "
786 "entries\n", old);
787 fprintf(stderr, "Delete this file to ensure privacy "
788 "of hostnames\n");
789 }
790 }
791
792 exit(0);
793 }
794
795 /*
796 * Perform changing a passphrase. The argument is the passwd structure
797 * for the current user.
798 */
799 static void
800 do_change_passphrase(struct passwd *pw)
801 {
802 char *comment;
803 char *old_passphrase, *passphrase1, *passphrase2;
804 struct stat st;
805 Key *private;
806
807 if (!have_identity)
808 ask_filename(pw, "Enter file in which the key is");
809 if (stat(identity_file, &st) < 0) {
810 perror(identity_file);
811 exit(1);
812 }
813 /* Try to load the file with empty passphrase. */
814 private = key_load_private(identity_file, "", &comment);
815 if (private == NULL) {
816 if (identity_passphrase)
817 old_passphrase = xstrdup(identity_passphrase);
818 else
819 old_passphrase =
820 read_passphrase("Enter old passphrase: ",
821 RP_ALLOW_STDIN);
822 private = key_load_private(identity_file, old_passphrase,
823 &comment);
824 memset(old_passphrase, 0, strlen(old_passphrase));
825 xfree(old_passphrase);
826 if (private == NULL) {
827 printf("Bad passphrase.\n");
828 exit(1);
829 }
830 }
831 printf("Key has comment '%s'\n", comment);
832
833 /* Ask the new passphrase (twice). */
834 if (identity_new_passphrase) {
835 passphrase1 = xstrdup(identity_new_passphrase);
836 passphrase2 = NULL;
837 } else {
838 passphrase1 =
839 read_passphrase("Enter new passphrase (empty for no "
840 "passphrase): ", RP_ALLOW_STDIN);
841 passphrase2 = read_passphrase("Enter same passphrase again: ",
842 RP_ALLOW_STDIN);
843
844 /* Verify that they are the same. */
845 if (strcmp(passphrase1, passphrase2) != 0) {
846 memset(passphrase1, 0, strlen(passphrase1));
847 memset(passphrase2, 0, strlen(passphrase2));
848 xfree(passphrase1);
849 xfree(passphrase2);
850 printf("Pass phrases do not match. Try again.\n");
851 exit(1);
852 }
853 /* Destroy the other copy. */
854 memset(passphrase2, 0, strlen(passphrase2));
855 xfree(passphrase2);
856 }
857
858 /* Save the file using the new passphrase. */
859 if (!key_save_private(private, identity_file, passphrase1, comment)) {
860 printf("Saving the key failed: %s.\n", identity_file);
861 memset(passphrase1, 0, strlen(passphrase1));
862 xfree(passphrase1);
863 key_free(private);
864 xfree(comment);
865 exit(1);
866 }
867 /* Destroy the passphrase and the copy of the key in memory. */
868 memset(passphrase1, 0, strlen(passphrase1));
869 xfree(passphrase1);
870 key_free(private); /* Destroys contents */
871 xfree(comment);
872
873 printf("Your identification has been saved with the new passphrase.\n");
874 exit(0);
875 }
876
877 /*
878 * Print the SSHFP RR.
879 */
880 static int
881 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
882 {
883 Key *public;
884 char *comment = NULL;
885 struct stat st;
886
887 if (fname == NULL)
888 ask_filename(pw, "Enter file in which the key is");
889 if (stat(fname, &st) < 0) {
890 if (errno == ENOENT)
891 return 0;
892 perror(fname);
893 exit(1);
894 }
895 public = key_load_public(fname, &comment);
896 if (public != NULL) {
897 export_dns_rr(hname, public, stdout, print_generic);
898 key_free(public);
899 xfree(comment);
900 return 1;
901 }
902 if (comment)
903 xfree(comment);
904
905 printf("failed to read v2 public key from %s.\n", fname);
906 exit(1);
907 }
908
909 /*
910 * Change the comment of a private key file.
911 */
912 static void
913 do_change_comment(struct passwd *pw)
914 {
915 char new_comment[1024], *comment, *passphrase;
916 Key *private;
917 Key *public;
918 struct stat st;
919 FILE *f;
920 int fd;
921
922 if (!have_identity)
923 ask_filename(pw, "Enter file in which the key is");
924 if (stat(identity_file, &st) < 0) {
925 perror(identity_file);
926 exit(1);
927 }
928 private = key_load_private(identity_file, "", &comment);
929 if (private == NULL) {
930 if (identity_passphrase)
931 passphrase = xstrdup(identity_passphrase);
932 else if (identity_new_passphrase)
933 passphrase = xstrdup(identity_new_passphrase);
934 else
935 passphrase = read_passphrase("Enter passphrase: ",
936 RP_ALLOW_STDIN);
937 /* Try to load using the passphrase. */
938 private = key_load_private(identity_file, passphrase, &comment);
939 if (private == NULL) {
940 memset(passphrase, 0, strlen(passphrase));
941 xfree(passphrase);
942 printf("Bad passphrase.\n");
943 exit(1);
944 }
945 } else {
946 passphrase = xstrdup("");
947 }
948 if (private->type != KEY_RSA1) {
949 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
950 key_free(private);
951 exit(1);
952 }
953 printf("Key now has comment '%s'\n", comment);
954
955 if (identity_comment) {
956 strlcpy(new_comment, identity_comment, sizeof(new_comment));
957 } else {
958 printf("Enter new comment: ");
959 fflush(stdout);
960 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
961 memset(passphrase, 0, strlen(passphrase));
962 key_free(private);
963 exit(1);
964 }
965 new_comment[strcspn(new_comment, "\n")] = '\0';
966 }
967
968 /* Save the file using the new passphrase. */
969 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
970 printf("Saving the key failed: %s.\n", identity_file);
971 memset(passphrase, 0, strlen(passphrase));
972 xfree(passphrase);
973 key_free(private);
974 xfree(comment);
975 exit(1);
976 }
977 memset(passphrase, 0, strlen(passphrase));
978 xfree(passphrase);
979 public = key_from_private(private);
980 key_free(private);
981
982 strlcat(identity_file, ".pub", sizeof(identity_file));
983 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
984 if (fd == -1) {
985 printf("Could not save your public key in %s\n", identity_file);
986 exit(1);
987 }
988 f = fdopen(fd, "w");
989 if (f == NULL) {
990 printf("fdopen %s failed", identity_file);
991 exit(1);
992 }
993 if (!key_write(public, f))
994 fprintf(stderr, "write key failed");
995 key_free(public);
996 fprintf(f, " %s\n", new_comment);
997 fclose(f);
998
999 xfree(comment);
1000
1001 printf("The comment in your key file has been changed.\n");
1002 exit(0);
1003 }
1004
1005 static void
1006 usage(void)
1007 {
1008 fprintf(stderr, "usage: %s [options]\n", __progname);
1009 fprintf(stderr, "Options:\n");
1010 fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n");
1011 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
1012 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
1013 fprintf(stderr, " -C comment Provide new comment.\n");
1014 fprintf(stderr, " -c Change comment in private and public key files.\n");
1015 #ifdef SMARTCARD
1016 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1017 #endif /* SMARTCARD */
1018 fprintf(stderr, " -e Convert OpenSSH to RFC 4716 key file.\n");
1019 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
1020 fprintf(stderr, " -f filename Filename of the key file.\n");
1021 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
1022 fprintf(stderr, " -g Use generic DNS resource record format.\n");
1023 fprintf(stderr, " -H Hash names in known_hosts file.\n");
1024 fprintf(stderr, " -i Convert RFC 4716 to OpenSSH key file.\n");
1025 fprintf(stderr, " -l Show fingerprint of key file.\n");
1026 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
1027 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1028 fprintf(stderr, " -P phrase Provide old passphrase.\n");
1029 fprintf(stderr, " -p Change passphrase of private key file.\n");
1030 fprintf(stderr, " -q Quiet.\n");
1031 fprintf(stderr, " -R hostname Remove host from known_hosts file.\n");
1032 fprintf(stderr, " -r hostname Print DNS resource record.\n");
1033 fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n");
1034 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n");
1035 fprintf(stderr, " -t type Specify type of key to create.\n");
1036 #ifdef SMARTCARD
1037 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1038 #endif /* SMARTCARD */
1039 fprintf(stderr, " -v Verbose.\n");
1040 fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n");
1041 fprintf(stderr, " -y Read private key file and print public key.\n");
1042
1043 exit(1);
1044 }
1045
1046 /*
1047 * Main program for key management.
1048 */
1049 int
1050 main(int argc, char **argv)
1051 {
1052 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
1053 char out_file[MAXPATHLEN], *reader_id = NULL;
1054 char *rr_hostname = NULL;
1055 Key *private, *public;
1056 struct passwd *pw;
1057 struct stat st;
1058 int opt, type, fd, download = 0;
1059 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
1060 int do_gen_candidates = 0, do_screen_candidates = 0;
1061 int log_level = SYSLOG_LEVEL_INFO;
1062 BIGNUM *start = NULL;
1063 FILE *f;
1064 const char *errstr;
1065
1066 extern int optind;
1067 extern char *optarg;
1068
1069 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1070 sanitise_stdfd();
1071
1072 __progname = ssh_get_progname(argv[0]);
1073
1074 SSLeay_add_all_algorithms();
1075 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
1076
1077 init_rng();
1078 seed_rng();
1079
1080 /* we need this for the home * directory. */
1081 pw = getpwuid(getuid());
1082 if (!pw) {
1083 printf("You don't exist, go away!\n");
1084 exit(1);
1085 }
1086 if (gethostname(hostname, sizeof(hostname)) < 0) {
1087 perror("gethostname");
1088 exit(1);
1089 }
1090
1091 while ((opt = getopt(argc, argv,
1092 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
1093 switch (opt) {
1094 case 'b':
1095 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
1096 if (errstr)
1097 fatal("Bits has bad value %s (%s)",
1098 optarg, errstr);
1099 break;
1100 case 'F':
1101 find_host = 1;
1102 rr_hostname = optarg;
1103 break;
1104 case 'H':
1105 hash_hosts = 1;
1106 break;
1107 case 'R':
1108 delete_host = 1;
1109 rr_hostname = optarg;
1110 break;
1111 case 'l':
1112 print_fingerprint = 1;
1113 break;
1114 case 'B':
1115 print_bubblebabble = 1;
1116 break;
1117 case 'p':
1118 change_passphrase = 1;
1119 break;
1120 case 'c':
1121 change_comment = 1;
1122 break;
1123 case 'f':
1124 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1125 sizeof(identity_file))
1126 fatal("Identity filename too long");
1127 have_identity = 1;
1128 break;
1129 case 'g':
1130 print_generic = 1;
1131 break;
1132 case 'P':
1133 identity_passphrase = optarg;
1134 break;
1135 case 'N':
1136 identity_new_passphrase = optarg;
1137 break;
1138 case 'C':
1139 identity_comment = optarg;
1140 break;
1141 case 'q':
1142 quiet = 1;
1143 break;
1144 case 'e':
1145 case 'x':
1146 /* export key */
1147 convert_to_ssh2 = 1;
1148 break;
1149 case 'i':
1150 case 'X':
1151 /* import key */
1152 convert_from_ssh2 = 1;
1153 break;
1154 case 'y':
1155 print_public = 1;
1156 break;
1157 case 'd':
1158 key_type_name = "dsa";
1159 break;
1160 case 't':
1161 key_type_name = optarg;
1162 break;
1163 case 'D':
1164 download = 1;
1165 /*FALLTHROUGH*/
1166 case 'U':
1167 reader_id = optarg;
1168 break;
1169 case 'v':
1170 if (log_level == SYSLOG_LEVEL_INFO)
1171 log_level = SYSLOG_LEVEL_DEBUG1;
1172 else {
1173 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
1174 log_level < SYSLOG_LEVEL_DEBUG3)
1175 log_level++;
1176 }
1177 break;
1178 case 'r':
1179 rr_hostname = optarg;
1180 break;
1181 case 'W':
1182 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1183 UINT_MAX, &errstr);
1184 if (errstr)
1185 fatal("Desired generator has bad value: %s (%s)",
1186 optarg, errstr);
1187 break;
1188 case 'a':
1189 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1190 if (errstr)
1191 fatal("Invalid number of trials: %s (%s)",
1192 optarg, errstr);
1193 break;
1194 case 'M':
1195 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
1196 if (errstr) {
1197 fatal("Memory limit is %s: %s", errstr, optarg);
1198 }
1199 break;
1200 case 'G':
1201 do_gen_candidates = 1;
1202 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1203 sizeof(out_file))
1204 fatal("Output filename too long");
1205 break;
1206 case 'T':
1207 do_screen_candidates = 1;
1208 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1209 sizeof(out_file))
1210 fatal("Output filename too long");
1211 break;
1212 case 'S':
1213 /* XXX - also compare length against bits */
1214 if (BN_hex2bn(&start, optarg) == 0)
1215 fatal("Invalid start point.");
1216 break;
1217 case '?':
1218 default:
1219 usage();
1220 }
1221 }
1222
1223 /* reinit */
1224 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
1225
1226 if (optind < argc) {
1227 printf("Too many arguments.\n");
1228 usage();
1229 }
1230 if (change_passphrase && change_comment) {
1231 printf("Can only have one of -p and -c.\n");
1232 usage();
1233 }
1234 if (delete_host || hash_hosts || find_host)
1235 do_known_hosts(pw, rr_hostname);
1236 if (print_fingerprint || print_bubblebabble)
1237 do_fingerprint(pw);
1238 if (change_passphrase)
1239 do_change_passphrase(pw);
1240 if (change_comment)
1241 do_change_comment(pw);
1242 if (convert_to_ssh2)
1243 do_convert_to_ssh2(pw);
1244 if (convert_from_ssh2)
1245 do_convert_from_ssh2(pw);
1246 if (print_public)
1247 do_print_public(pw);
1248 if (rr_hostname != NULL) {
1249 unsigned int n = 0;
1250
1251 if (have_identity) {
1252 n = do_print_resource_record(pw,
1253 identity_file, rr_hostname);
1254 if (n == 0) {
1255 perror(identity_file);
1256 exit(1);
1257 }
1258 exit(0);
1259 } else {
1260
1261 n += do_print_resource_record(pw,
1262 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
1263 n += do_print_resource_record(pw,
1264 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
1265
1266 if (n == 0)
1267 fatal("no keys found.");
1268 exit(0);
1269 }
1270 }
1271 if (reader_id != NULL) {
1272 #ifdef SMARTCARD
1273 if (download)
1274 do_download(pw, reader_id);
1275 else
1276 do_upload(pw, reader_id);
1277 #else /* SMARTCARD */
1278 fatal("no support for smartcards.");
1279 #endif /* SMARTCARD */
1280 }
1281
1282 if (do_gen_candidates) {
1283 FILE *out = fopen(out_file, "w");
1284
1285 if (out == NULL) {
1286 error("Couldn't open modulus candidate file \"%s\": %s",
1287 out_file, strerror(errno));
1288 return (1);
1289 }
1290 if (bits == 0)
1291 bits = DEFAULT_BITS;
1292 if (gen_candidates(out, memory, bits, start) != 0)
1293 fatal("modulus candidate generation failed");
1294
1295 return (0);
1296 }
1297
1298 if (do_screen_candidates) {
1299 FILE *in;
1300 FILE *out = fopen(out_file, "w");
1301
1302 if (have_identity && strcmp(identity_file, "-") != 0) {
1303 if ((in = fopen(identity_file, "r")) == NULL) {
1304 fatal("Couldn't open modulus candidate "
1305 "file \"%s\": %s", identity_file,
1306 strerror(errno));
1307 }
1308 } else
1309 in = stdin;
1310
1311 if (out == NULL) {
1312 fatal("Couldn't open moduli file \"%s\": %s",
1313 out_file, strerror(errno));
1314 }
1315 if (prime_test(in, out, trials, generator_wanted) != 0)
1316 fatal("modulus screening failed");
1317 return (0);
1318 }
1319
1320 arc4random_stir();
1321
1322 if (key_type_name == NULL)
1323 key_type_name = "rsa";
1324
1325 type = key_type_from_name(key_type_name);
1326 if (type == KEY_UNSPEC) {
1327 fprintf(stderr, "unknown key type %s\n", key_type_name);
1328 exit(1);
1329 }
1330 if (bits == 0)
1331 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
1332 if (type == KEY_DSA && bits != 1024)
1333 fatal("DSA keys must be 1024 bits");
1334 if (!quiet)
1335 printf("Generating public/private %s key pair.\n", key_type_name);
1336 private = key_generate(type, bits);
1337 if (private == NULL) {
1338 fprintf(stderr, "key_generate failed");
1339 exit(1);
1340 }
1341 public = key_from_private(private);
1342
1343 if (!have_identity)
1344 ask_filename(pw, "Enter file in which to save the key");
1345
1346 /* Create ~/.ssh directory if it doesn't already exist. */
1347 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1348 if (strstr(identity_file, dotsshdir) != NULL &&
1349 stat(dotsshdir, &st) < 0) {
1350 if (mkdir(dotsshdir, 0700) < 0)
1351 error("Could not create directory '%s'.", dotsshdir);
1352 else if (!quiet)
1353 printf("Created directory '%s'.\n", dotsshdir);
1354 }
1355 /* If the file already exists, ask the user to confirm. */
1356 if (stat(identity_file, &st) >= 0) {
1357 char yesno[3];
1358 printf("%s already exists.\n", identity_file);
1359 printf("Overwrite (y/n)? ");
1360 fflush(stdout);
1361 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1362 exit(1);
1363 if (yesno[0] != 'y' && yesno[0] != 'Y')
1364 exit(1);
1365 }
1366 /* Ask for a passphrase (twice). */
1367 if (identity_passphrase)
1368 passphrase1 = xstrdup(identity_passphrase);
1369 else if (identity_new_passphrase)
1370 passphrase1 = xstrdup(identity_new_passphrase);
1371 else {
1372 passphrase_again:
1373 passphrase1 =
1374 read_passphrase("Enter passphrase (empty for no "
1375 "passphrase): ", RP_ALLOW_STDIN);
1376 passphrase2 = read_passphrase("Enter same passphrase again: ",
1377 RP_ALLOW_STDIN);
1378 if (strcmp(passphrase1, passphrase2) != 0) {
1379 /*
1380 * The passphrases do not match. Clear them and
1381 * retry.
1382 */
1383 memset(passphrase1, 0, strlen(passphrase1));
1384 memset(passphrase2, 0, strlen(passphrase2));
1385 xfree(passphrase1);
1386 xfree(passphrase2);
1387 printf("Passphrases do not match. Try again.\n");
1388 goto passphrase_again;
1389 }
1390 /* Clear the other copy of the passphrase. */
1391 memset(passphrase2, 0, strlen(passphrase2));
1392 xfree(passphrase2);
1393 }
1394
1395 if (identity_comment) {
1396 strlcpy(comment, identity_comment, sizeof(comment));
1397 } else {
1398 /* Create default commend field for the passphrase. */
1399 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1400 }
1401
1402 /* Save the key with the given passphrase and comment. */
1403 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1404 printf("Saving the key failed: %s.\n", identity_file);
1405 memset(passphrase1, 0, strlen(passphrase1));
1406 xfree(passphrase1);
1407 exit(1);
1408 }
1409 /* Clear the passphrase. */
1410 memset(passphrase1, 0, strlen(passphrase1));
1411 xfree(passphrase1);
1412
1413 /* Clear the private key and the random number generator. */
1414 key_free(private);
1415 arc4random_stir();
1416
1417 if (!quiet)
1418 printf("Your identification has been saved in %s.\n", identity_file);
1419
1420 strlcat(identity_file, ".pub", sizeof(identity_file));
1421 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1422 if (fd == -1) {
1423 printf("Could not save your public key in %s\n", identity_file);
1424 exit(1);
1425 }
1426 f = fdopen(fd, "w");
1427 if (f == NULL) {
1428 printf("fdopen %s failed", identity_file);
1429 exit(1);
1430 }
1431 if (!key_write(public, f))
1432 fprintf(stderr, "write key failed");
1433 fprintf(f, " %s\n", comment);
1434 fclose(f);
1435
1436 if (!quiet) {
1437 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1438 printf("Your public key has been saved in %s.\n",
1439 identity_file);
1440 printf("The key fingerprint is:\n");
1441 printf("%s %s\n", fp, comment);
1442 xfree(fp);
1443 }
1444
1445 key_free(public);
1446 exit(0);
1447 }
DragonFly BSD