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Missing files during OpenSSH import.
[dragonfly.git] / crypto / openssh-3.8.1p1 / ssh-keygen.c
blob1156a010ae7a5ea8a86c7e40a64ee040c5c9c252
1 /*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * Identity and host key generation and maintenance.
6 *
7 * As far as I am concerned, the code I have written for this software
8 * can be used freely for any purpose. Any derived versions of this
9 * software must be clearly marked as such, and if the derived work is
10 * incompatible with the protocol description in the RFC file, it must be
11 * called by a name other than "ssh" or "Secure Shell".
12 */
13
14 #include "includes.h"
15 RCSID("$OpenBSD: ssh-keygen.c,v 1.113 2003/12/22 09:16:58 djm Exp $");
16
17 #include <openssl/evp.h>
18 #include <openssl/pem.h>
19
20 #include "xmalloc.h"
21 #include "key.h"
22 #include "rsa.h"
23 #include "authfile.h"
24 #include "uuencode.h"
25 #include "buffer.h"
26 #include "bufaux.h"
27 #include "pathnames.h"
28 #include "log.h"
29 #include "readpass.h"
30 #include "moduli.h"
31
32 #ifdef SMARTCARD
33 #include "scard.h"
34 #endif
35 #include "dns.h"
36
37 /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */
38 int bits = 1024;
39
40 /*
41 * Flag indicating that we just want to change the passphrase. This can be
42 * set on the command line.
43 */
44 int change_passphrase = 0;
45
46 /*
47 * Flag indicating that we just want to change the comment. This can be set
48 * on the command line.
49 */
50 int change_comment = 0;
51
52 int quiet = 0;
53
54 /* Flag indicating that we just want to see the key fingerprint */
55 int print_fingerprint = 0;
56 int print_bubblebabble = 0;
57
58 /* The identity file name, given on the command line or entered by the user. */
59 char identity_file[1024];
60 int have_identity = 0;
61
62 /* This is set to the passphrase if given on the command line. */
63 char *identity_passphrase = NULL;
64
65 /* This is set to the new passphrase if given on the command line. */
66 char *identity_new_passphrase = NULL;
67
68 /* This is set to the new comment if given on the command line. */
69 char *identity_comment = NULL;
70
71 /* Dump public key file in format used by real and the original SSH 2 */
72 int convert_to_ssh2 = 0;
73 int convert_from_ssh2 = 0;
74 int print_public = 0;
75 int print_generic = 0;
76
77 char *key_type_name = NULL;
78
79 /* argv0 */
80 #ifdef HAVE___PROGNAME
81 extern char *__progname;
82 #else
83 char *__progname;
84 #endif
85
86 char hostname[MAXHOSTNAMELEN];
87
88 static void
89 ask_filename(struct passwd *pw, const char *prompt)
90 {
91 char buf[1024];
92 char *name = NULL;
93
94 if (key_type_name == NULL)
95 name = _PATH_SSH_CLIENT_ID_RSA;
96 else
97 switch (key_type_from_name(key_type_name)) {
98 case KEY_RSA1:
99 name = _PATH_SSH_CLIENT_IDENTITY;
100 break;
101 case KEY_DSA:
102 name = _PATH_SSH_CLIENT_ID_DSA;
103 break;
104 case KEY_RSA:
105 name = _PATH_SSH_CLIENT_ID_RSA;
106 break;
107 default:
108 fprintf(stderr, "bad key type");
109 exit(1);
110 break;
111 }
112
113 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
114 fprintf(stderr, "%s (%s): ", prompt, identity_file);
115 if (fgets(buf, sizeof(buf), stdin) == NULL)
116 exit(1);
117 if (strchr(buf, '\n'))
118 *strchr(buf, '\n') = 0;
119 if (strcmp(buf, "") != 0)
120 strlcpy(identity_file, buf, sizeof(identity_file));
121 have_identity = 1;
122 }
123
124 static Key *
125 load_identity(char *filename)
126 {
127 char *pass;
128 Key *prv;
129
130 prv = key_load_private(filename, "", NULL);
131 if (prv == NULL) {
132 if (identity_passphrase)
133 pass = xstrdup(identity_passphrase);
134 else
135 pass = read_passphrase("Enter passphrase: ",
136 RP_ALLOW_STDIN);
137 prv = key_load_private(filename, pass, NULL);
138 memset(pass, 0, strlen(pass));
139 xfree(pass);
140 }
141 return prv;
142 }
143
144 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
145 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
146 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
147 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
148
149 static void
150 do_convert_to_ssh2(struct passwd *pw)
151 {
152 Key *k;
153 u_int len;
154 u_char *blob;
155 struct stat st;
156
157 if (!have_identity)
158 ask_filename(pw, "Enter file in which the key is");
159 if (stat(identity_file, &st) < 0) {
160 perror(identity_file);
161 exit(1);
162 }
163 if ((k = key_load_public(identity_file, NULL)) == NULL) {
164 if ((k = load_identity(identity_file)) == NULL) {
165 fprintf(stderr, "load failed\n");
166 exit(1);
167 }
168 }
169 if (k->type == KEY_RSA1) {
170 fprintf(stderr, "version 1 keys are not supported\n");
171 exit(1);
172 }
173 if (key_to_blob(k, &blob, &len) <= 0) {
174 fprintf(stderr, "key_to_blob failed\n");
175 exit(1);
176 }
177 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
178 fprintf(stdout,
179 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
180 key_size(k), key_type(k),
181 pw->pw_name, hostname);
182 dump_base64(stdout, blob, len);
183 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
184 key_free(k);
185 xfree(blob);
186 exit(0);
187 }
188
189 static void
190 buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
191 {
192 u_int bits = buffer_get_int(b);
193 u_int bytes = (bits + 7) / 8;
194
195 if (buffer_len(b) < bytes)
196 fatal("buffer_get_bignum_bits: input buffer too small: "
197 "need %d have %d", bytes, buffer_len(b));
198 BN_bin2bn(buffer_ptr(b), bytes, value);
199 buffer_consume(b, bytes);
200 }
201
202 static Key *
203 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
204 {
205 Buffer b;
206 Key *key = NULL;
207 char *type, *cipher;
208 u_char *sig, data[] = "abcde12345";
209 int magic, rlen, ktype, i1, i2, i3, i4;
210 u_int slen;
211 u_long e;
212
213 buffer_init(&b);
214 buffer_append(&b, blob, blen);
215
216 magic = buffer_get_int(&b);
217 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
218 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
219 buffer_free(&b);
220 return NULL;
221 }
222 i1 = buffer_get_int(&b);
223 type = buffer_get_string(&b, NULL);
224 cipher = buffer_get_string(&b, NULL);
225 i2 = buffer_get_int(&b);
226 i3 = buffer_get_int(&b);
227 i4 = buffer_get_int(&b);
228 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
229 if (strcmp(cipher, "none") != 0) {
230 error("unsupported cipher %s", cipher);
231 xfree(cipher);
232 buffer_free(&b);
233 xfree(type);
234 return NULL;
235 }
236 xfree(cipher);
237
238 if (strstr(type, "dsa")) {
239 ktype = KEY_DSA;
240 } else if (strstr(type, "rsa")) {
241 ktype = KEY_RSA;
242 } else {
243 xfree(type);
244 return NULL;
245 }
246 key = key_new_private(ktype);
247 xfree(type);
248
249 switch (key->type) {
250 case KEY_DSA:
251 buffer_get_bignum_bits(&b, key->dsa->p);
252 buffer_get_bignum_bits(&b, key->dsa->g);
253 buffer_get_bignum_bits(&b, key->dsa->q);
254 buffer_get_bignum_bits(&b, key->dsa->pub_key);
255 buffer_get_bignum_bits(&b, key->dsa->priv_key);
256 break;
257 case KEY_RSA:
258 e = buffer_get_char(&b);
259 debug("e %lx", e);
260 if (e < 30) {
261 e <<= 8;
262 e += buffer_get_char(&b);
263 debug("e %lx", e);
264 e <<= 8;
265 e += buffer_get_char(&b);
266 debug("e %lx", e);
267 }
268 if (!BN_set_word(key->rsa->e, e)) {
269 buffer_free(&b);
270 key_free(key);
271 return NULL;
272 }
273 buffer_get_bignum_bits(&b, key->rsa->d);
274 buffer_get_bignum_bits(&b, key->rsa->n);
275 buffer_get_bignum_bits(&b, key->rsa->iqmp);
276 buffer_get_bignum_bits(&b, key->rsa->q);
277 buffer_get_bignum_bits(&b, key->rsa->p);
278 rsa_generate_additional_parameters(key->rsa);
279 break;
280 }
281 rlen = buffer_len(&b);
282 if (rlen != 0)
283 error("do_convert_private_ssh2_from_blob: "
284 "remaining bytes in key blob %d", rlen);
285 buffer_free(&b);
286
287 /* try the key */
288 key_sign(key, &sig, &slen, data, sizeof(data));
289 key_verify(key, sig, slen, data, sizeof(data));
290 xfree(sig);
291 return key;
292 }
293
294 static void
295 do_convert_from_ssh2(struct passwd *pw)
296 {
297 Key *k;
298 int blen;
299 u_int len;
300 char line[1024], *p;
301 u_char blob[8096];
302 char encoded[8096];
303 struct stat st;
304 int escaped = 0, private = 0, ok;
305 FILE *fp;
306
307 if (!have_identity)
308 ask_filename(pw, "Enter file in which the key is");
309 if (stat(identity_file, &st) < 0) {
310 perror(identity_file);
311 exit(1);
312 }
313 fp = fopen(identity_file, "r");
314 if (fp == NULL) {
315 perror(identity_file);
316 exit(1);
317 }
318 encoded[0] = '\0';
319 while (fgets(line, sizeof(line), fp)) {
320 if (!(p = strchr(line, '\n'))) {
321 fprintf(stderr, "input line too long.\n");
322 exit(1);
323 }
324 if (p > line && p[-1] == '\\')
325 escaped++;
326 if (strncmp(line, "----", 4) == 0 ||
327 strstr(line, ": ") != NULL) {
328 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
329 private = 1;
330 if (strstr(line, " END ") != NULL) {
331 break;
332 }
333 /* fprintf(stderr, "ignore: %s", line); */
334 continue;
335 }
336 if (escaped) {
337 escaped--;
338 /* fprintf(stderr, "escaped: %s", line); */
339 continue;
340 }
341 *p = '\0';
342 strlcat(encoded, line, sizeof(encoded));
343 }
344 len = strlen(encoded);
345 if (((len % 4) == 3) &&
346 (encoded[len-1] == '=') &&
347 (encoded[len-2] == '=') &&
348 (encoded[len-3] == '='))
349 encoded[len-3] = '\0';
350 blen = uudecode(encoded, blob, sizeof(blob));
351 if (blen < 0) {
352 fprintf(stderr, "uudecode failed.\n");
353 exit(1);
354 }
355 k = private ?
356 do_convert_private_ssh2_from_blob(blob, blen) :
357 key_from_blob(blob, blen);
358 if (k == NULL) {
359 fprintf(stderr, "decode blob failed.\n");
360 exit(1);
361 }
362 ok = private ?
363 (k->type == KEY_DSA ?
364 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
365 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
366 key_write(k, stdout);
367 if (!ok) {
368 fprintf(stderr, "key write failed");
369 exit(1);
370 }
371 key_free(k);
372 if (!private)
373 fprintf(stdout, "\n");
374 fclose(fp);
375 exit(0);
376 }
377
378 static void
379 do_print_public(struct passwd *pw)
380 {
381 Key *prv;
382 struct stat st;
383
384 if (!have_identity)
385 ask_filename(pw, "Enter file in which the key is");
386 if (stat(identity_file, &st) < 0) {
387 perror(identity_file);
388 exit(1);
389 }
390 prv = load_identity(identity_file);
391 if (prv == NULL) {
392 fprintf(stderr, "load failed\n");
393 exit(1);
394 }
395 if (!key_write(prv, stdout))
396 fprintf(stderr, "key_write failed");
397 key_free(prv);
398 fprintf(stdout, "\n");
399 exit(0);
400 }
401
402 #ifdef SMARTCARD
403 static void
404 do_upload(struct passwd *pw, const char *sc_reader_id)
405 {
406 Key *prv = NULL;
407 struct stat st;
408 int ret;
409
410 if (!have_identity)
411 ask_filename(pw, "Enter file in which the key is");
412 if (stat(identity_file, &st) < 0) {
413 perror(identity_file);
414 exit(1);
415 }
416 prv = load_identity(identity_file);
417 if (prv == NULL) {
418 error("load failed");
419 exit(1);
420 }
421 ret = sc_put_key(prv, sc_reader_id);
422 key_free(prv);
423 if (ret < 0)
424 exit(1);
425 logit("loading key done");
426 exit(0);
427 }
428
429 static void
430 do_download(struct passwd *pw, const char *sc_reader_id)
431 {
432 Key **keys = NULL;
433 int i;
434
435 keys = sc_get_keys(sc_reader_id, NULL);
436 if (keys == NULL)
437 fatal("cannot read public key from smartcard");
438 for (i = 0; keys[i]; i++) {
439 key_write(keys[i], stdout);
440 key_free(keys[i]);
441 fprintf(stdout, "\n");
442 }
443 xfree(keys);
444 exit(0);
445 }
446 #endif /* SMARTCARD */
447
448 static void
449 do_fingerprint(struct passwd *pw)
450 {
451 FILE *f;
452 Key *public;
453 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
454 int i, skip = 0, num = 1, invalid = 1;
455 enum fp_rep rep;
456 enum fp_type fptype;
457 struct stat st;
458
459 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
460 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
461
462 if (!have_identity)
463 ask_filename(pw, "Enter file in which the key is");
464 if (stat(identity_file, &st) < 0) {
465 perror(identity_file);
466 exit(1);
467 }
468 public = key_load_public(identity_file, &comment);
469 if (public != NULL) {
470 fp = key_fingerprint(public, fptype, rep);
471 printf("%u %s %s\n", key_size(public), fp, comment);
472 key_free(public);
473 xfree(comment);
474 xfree(fp);
475 exit(0);
476 }
477 if (comment)
478 xfree(comment);
479
480 f = fopen(identity_file, "r");
481 if (f != NULL) {
482 while (fgets(line, sizeof(line), f)) {
483 i = strlen(line) - 1;
484 if (line[i] != '\n') {
485 error("line %d too long: %.40s...", num, line);
486 skip = 1;
487 continue;
488 }
489 num++;
490 if (skip) {
491 skip = 0;
492 continue;
493 }
494 line[i] = '\0';
495
496 /* Skip leading whitespace, empty and comment lines. */
497 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
498 ;
499 if (!*cp || *cp == '\n' || *cp == '#')
500 continue ;
501 i = strtol(cp, &ep, 10);
502 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
503 int quoted = 0;
504 comment = cp;
505 for (; *cp && (quoted || (*cp != ' ' &&
506 *cp != '\t')); cp++) {
507 if (*cp == '\\' && cp[1] == '"')
508 cp++; /* Skip both */
509 else if (*cp == '"')
510 quoted = !quoted;
511 }
512 if (!*cp)
513 continue;
514 *cp++ = '\0';
515 }
516 ep = cp;
517 public = key_new(KEY_RSA1);
518 if (key_read(public, &cp) != 1) {
519 cp = ep;
520 key_free(public);
521 public = key_new(KEY_UNSPEC);
522 if (key_read(public, &cp) != 1) {
523 key_free(public);
524 continue;
525 }
526 }
527 comment = *cp ? cp : comment;
528 fp = key_fingerprint(public, fptype, rep);
529 printf("%u %s %s\n", key_size(public), fp,
530 comment ? comment : "no comment");
531 xfree(fp);
532 key_free(public);
533 invalid = 0;
534 }
535 fclose(f);
536 }
537 if (invalid) {
538 printf("%s is not a public key file.\n", identity_file);
539 exit(1);
540 }
541 exit(0);
542 }
543
544 /*
545 * Perform changing a passphrase. The argument is the passwd structure
546 * for the current user.
547 */
548 static void
549 do_change_passphrase(struct passwd *pw)
550 {
551 char *comment;
552 char *old_passphrase, *passphrase1, *passphrase2;
553 struct stat st;
554 Key *private;
555
556 if (!have_identity)
557 ask_filename(pw, "Enter file in which the key is");
558 if (stat(identity_file, &st) < 0) {
559 perror(identity_file);
560 exit(1);
561 }
562 /* Try to load the file with empty passphrase. */
563 private = key_load_private(identity_file, "", &comment);
564 if (private == NULL) {
565 if (identity_passphrase)
566 old_passphrase = xstrdup(identity_passphrase);
567 else
568 old_passphrase =
569 read_passphrase("Enter old passphrase: ",
570 RP_ALLOW_STDIN);
571 private = key_load_private(identity_file, old_passphrase,
572 &comment);
573 memset(old_passphrase, 0, strlen(old_passphrase));
574 xfree(old_passphrase);
575 if (private == NULL) {
576 printf("Bad passphrase.\n");
577 exit(1);
578 }
579 }
580 printf("Key has comment '%s'\n", comment);
581
582 /* Ask the new passphrase (twice). */
583 if (identity_new_passphrase) {
584 passphrase1 = xstrdup(identity_new_passphrase);
585 passphrase2 = NULL;
586 } else {
587 passphrase1 =
588 read_passphrase("Enter new passphrase (empty for no "
589 "passphrase): ", RP_ALLOW_STDIN);
590 passphrase2 = read_passphrase("Enter same passphrase again: ",
591 RP_ALLOW_STDIN);
592
593 /* Verify that they are the same. */
594 if (strcmp(passphrase1, passphrase2) != 0) {
595 memset(passphrase1, 0, strlen(passphrase1));
596 memset(passphrase2, 0, strlen(passphrase2));
597 xfree(passphrase1);
598 xfree(passphrase2);
599 printf("Pass phrases do not match. Try again.\n");
600 exit(1);
601 }
602 /* Destroy the other copy. */
603 memset(passphrase2, 0, strlen(passphrase2));
604 xfree(passphrase2);
605 }
606
607 /* Save the file using the new passphrase. */
608 if (!key_save_private(private, identity_file, passphrase1, comment)) {
609 printf("Saving the key failed: %s.\n", identity_file);
610 memset(passphrase1, 0, strlen(passphrase1));
611 xfree(passphrase1);
612 key_free(private);
613 xfree(comment);
614 exit(1);
615 }
616 /* Destroy the passphrase and the copy of the key in memory. */
617 memset(passphrase1, 0, strlen(passphrase1));
618 xfree(passphrase1);
619 key_free(private); /* Destroys contents */
620 xfree(comment);
621
622 printf("Your identification has been saved with the new passphrase.\n");
623 exit(0);
624 }
625
626 /*
627 * Print the SSHFP RR.
628 */
629 static void
630 do_print_resource_record(struct passwd *pw, char *hostname)
631 {
632 Key *public;
633 char *comment = NULL;
634 struct stat st;
635
636 if (!have_identity)
637 ask_filename(pw, "Enter file in which the key is");
638 if (stat(identity_file, &st) < 0) {
639 perror(identity_file);
640 exit(1);
641 }
642 public = key_load_public(identity_file, &comment);
643 if (public != NULL) {
644 export_dns_rr(hostname, public, stdout, print_generic);
645 key_free(public);
646 xfree(comment);
647 exit(0);
648 }
649 if (comment)
650 xfree(comment);
651
652 printf("failed to read v2 public key from %s.\n", identity_file);
653 exit(1);
654 }
655
656 /*
657 * Change the comment of a private key file.
658 */
659 static void
660 do_change_comment(struct passwd *pw)
661 {
662 char new_comment[1024], *comment, *passphrase;
663 Key *private;
664 Key *public;
665 struct stat st;
666 FILE *f;
667 int fd;
668
669 if (!have_identity)
670 ask_filename(pw, "Enter file in which the key is");
671 if (stat(identity_file, &st) < 0) {
672 perror(identity_file);
673 exit(1);
674 }
675 private = key_load_private(identity_file, "", &comment);
676 if (private == NULL) {
677 if (identity_passphrase)
678 passphrase = xstrdup(identity_passphrase);
679 else if (identity_new_passphrase)
680 passphrase = xstrdup(identity_new_passphrase);
681 else
682 passphrase = read_passphrase("Enter passphrase: ",
683 RP_ALLOW_STDIN);
684 /* Try to load using the passphrase. */
685 private = key_load_private(identity_file, passphrase, &comment);
686 if (private == NULL) {
687 memset(passphrase, 0, strlen(passphrase));
688 xfree(passphrase);
689 printf("Bad passphrase.\n");
690 exit(1);
691 }
692 } else {
693 passphrase = xstrdup("");
694 }
695 if (private->type != KEY_RSA1) {
696 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
697 key_free(private);
698 exit(1);
699 }
700 printf("Key now has comment '%s'\n", comment);
701
702 if (identity_comment) {
703 strlcpy(new_comment, identity_comment, sizeof(new_comment));
704 } else {
705 printf("Enter new comment: ");
706 fflush(stdout);
707 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
708 memset(passphrase, 0, strlen(passphrase));
709 key_free(private);
710 exit(1);
711 }
712 if (strchr(new_comment, '\n'))
713 *strchr(new_comment, '\n') = 0;
714 }
715
716 /* Save the file using the new passphrase. */
717 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
718 printf("Saving the key failed: %s.\n", identity_file);
719 memset(passphrase, 0, strlen(passphrase));
720 xfree(passphrase);
721 key_free(private);
722 xfree(comment);
723 exit(1);
724 }
725 memset(passphrase, 0, strlen(passphrase));
726 xfree(passphrase);
727 public = key_from_private(private);
728 key_free(private);
729
730 strlcat(identity_file, ".pub", sizeof(identity_file));
731 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
732 if (fd == -1) {
733 printf("Could not save your public key in %s\n", identity_file);
734 exit(1);
735 }
736 f = fdopen(fd, "w");
737 if (f == NULL) {
738 printf("fdopen %s failed", identity_file);
739 exit(1);
740 }
741 if (!key_write(public, f))
742 fprintf(stderr, "write key failed");
743 key_free(public);
744 fprintf(f, " %s\n", new_comment);
745 fclose(f);
746
747 xfree(comment);
748
749 printf("The comment in your key file has been changed.\n");
750 exit(0);
751 }
752
753 static void
754 usage(void)
755 {
756 fprintf(stderr, "Usage: %s [options]\n", __progname);
757 fprintf(stderr, "Options:\n");
758 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
759 fprintf(stderr, " -c Change comment in private and public key files.\n");
760 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
761 fprintf(stderr, " -f filename Filename of the key file.\n");
762 fprintf(stderr, " -g Use generic DNS resource record format.\n");
763 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
764 fprintf(stderr, " -l Show fingerprint of key file.\n");
765 fprintf(stderr, " -p Change passphrase of private key file.\n");
766 fprintf(stderr, " -q Quiet.\n");
767 fprintf(stderr, " -y Read private key file and print public key.\n");
768 fprintf(stderr, " -t type Specify type of key to create.\n");
769 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
770 fprintf(stderr, " -C comment Provide new comment.\n");
771 fprintf(stderr, " -N phrase Provide new passphrase.\n");
772 fprintf(stderr, " -P phrase Provide old passphrase.\n");
773 fprintf(stderr, " -r hostname Print DNS resource record.\n");
774 #ifdef SMARTCARD
775 fprintf(stderr, " -D reader Download public key from smartcard.\n");
776 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
777 #endif /* SMARTCARD */
778
779 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n");
780 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n");
781
782 exit(1);
783 }
784
785 /*
786 * Main program for key management.
787 */
788 int
789 main(int ac, char **av)
790 {
791 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
792 char out_file[MAXPATHLEN], *reader_id = NULL;
793 char *resource_record_hostname = NULL;
794 Key *private, *public;
795 struct passwd *pw;
796 struct stat st;
797 int opt, type, fd, download = 0, memory = 0;
798 int generator_wanted = 0, trials = 100;
799 int do_gen_candidates = 0, do_screen_candidates = 0;
800 int log_level = SYSLOG_LEVEL_INFO;
801 BIGNUM *start = NULL;
802 FILE *f;
803
804 extern int optind;
805 extern char *optarg;
806
807 __progname = ssh_get_progname(av[0]);
808
809 SSLeay_add_all_algorithms();
810 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
811
812 init_rng();
813 seed_rng();
814
815 /* we need this for the home * directory. */
816 pw = getpwuid(getuid());
817 if (!pw) {
818 printf("You don't exist, go away!\n");
819 exit(1);
820 }
821 if (gethostname(hostname, sizeof(hostname)) < 0) {
822 perror("gethostname");
823 exit(1);
824 }
825
826 while ((opt = getopt(ac, av,
827 "degiqpclBRvxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) {
828 switch (opt) {
829 case 'b':
830 bits = atoi(optarg);
831 if (bits < 512 || bits > 32768) {
832 printf("Bits has bad value.\n");
833 exit(1);
834 }
835 break;
836 case 'l':
837 print_fingerprint = 1;
838 break;
839 case 'B':
840 print_bubblebabble = 1;
841 break;
842 case 'p':
843 change_passphrase = 1;
844 break;
845 case 'c':
846 change_comment = 1;
847 break;
848 case 'f':
849 strlcpy(identity_file, optarg, sizeof(identity_file));
850 have_identity = 1;
851 break;
852 case 'g':
853 print_generic = 1;
854 break;
855 case 'P':
856 identity_passphrase = optarg;
857 break;
858 case 'N':
859 identity_new_passphrase = optarg;
860 break;
861 case 'C':
862 identity_comment = optarg;
863 break;
864 case 'q':
865 quiet = 1;
866 break;
867 case 'R':
868 /* unused */
869 exit(0);
870 break;
871 case 'e':
872 case 'x':
873 /* export key */
874 convert_to_ssh2 = 1;
875 break;
876 case 'i':
877 case 'X':
878 /* import key */
879 convert_from_ssh2 = 1;
880 break;
881 case 'y':
882 print_public = 1;
883 break;
884 case 'd':
885 key_type_name = "dsa";
886 break;
887 case 't':
888 key_type_name = optarg;
889 break;
890 case 'D':
891 download = 1;
892 case 'U':
893 reader_id = optarg;
894 break;
895 case 'v':
896 if (log_level == SYSLOG_LEVEL_INFO)
897 log_level = SYSLOG_LEVEL_DEBUG1;
898 else {
899 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
900 log_level < SYSLOG_LEVEL_DEBUG3)
901 log_level++;
902 }
903 break;
904 case 'r':
905 resource_record_hostname = optarg;
906 break;
907 case 'W':
908 generator_wanted = atoi(optarg);
909 if (generator_wanted < 1)
910 fatal("Desired generator has bad value.");
911 break;
912 case 'a':
913 trials = atoi(optarg);
914 if (trials < TRIAL_MINIMUM) {
915 fatal("Minimum primality trials is %d",
916 TRIAL_MINIMUM);
917 }
918 break;
919 case 'M':
920 memory = atoi(optarg);
921 if (memory != 0 &&
922 (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) {
923 fatal("Invalid memory amount (min %ld, max %ld)",
924 LARGE_MINIMUM, LARGE_MAXIMUM);
925 }
926 break;
927 case 'G':
928 do_gen_candidates = 1;
929 strlcpy(out_file, optarg, sizeof(out_file));
930 break;
931 case 'T':
932 do_screen_candidates = 1;
933 strlcpy(out_file, optarg, sizeof(out_file));
934 break;
935 case 'S':
936 /* XXX - also compare length against bits */
937 if (BN_hex2bn(&start, optarg) == 0)
938 fatal("Invalid start point.");
939 break;
940 case '?':
941 default:
942 usage();
943 }
944 }
945
946 /* reinit */
947 log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1);
948
949 if (optind < ac) {
950 printf("Too many arguments.\n");
951 usage();
952 }
953 if (change_passphrase && change_comment) {
954 printf("Can only have one of -p and -c.\n");
955 usage();
956 }
957 if (print_fingerprint || print_bubblebabble)
958 do_fingerprint(pw);
959 if (change_passphrase)
960 do_change_passphrase(pw);
961 if (change_comment)
962 do_change_comment(pw);
963 if (convert_to_ssh2)
964 do_convert_to_ssh2(pw);
965 if (convert_from_ssh2)
966 do_convert_from_ssh2(pw);
967 if (print_public)
968 do_print_public(pw);
969 if (resource_record_hostname != NULL) {
970 do_print_resource_record(pw, resource_record_hostname);
971 }
972 if (reader_id != NULL) {
973 #ifdef SMARTCARD
974 if (download)
975 do_download(pw, reader_id);
976 else
977 do_upload(pw, reader_id);
978 #else /* SMARTCARD */
979 fatal("no support for smartcards.");
980 #endif /* SMARTCARD */
981 }
982
983 if (do_gen_candidates) {
984 FILE *out = fopen(out_file, "w");
985
986 if (out == NULL) {
987 error("Couldn't open modulus candidate file \"%s\": %s",
988 out_file, strerror(errno));
989 return (1);
990 }
991 if (gen_candidates(out, memory, bits, start) != 0)
992 fatal("modulus candidate generation failed\n");
993
994 return (0);
995 }
996
997 if (do_screen_candidates) {
998 FILE *in;
999 FILE *out = fopen(out_file, "w");
1000
1001 if (have_identity && strcmp(identity_file, "-") != 0) {
1002 if ((in = fopen(identity_file, "r")) == NULL) {
1003 fatal("Couldn't open modulus candidate "
1004 "file \"%s\": %s", identity_file,
1005 strerror(errno));
1006 }
1007 } else
1008 in = stdin;
1009
1010 if (out == NULL) {
1011 fatal("Couldn't open moduli file \"%s\": %s",
1012 out_file, strerror(errno));
1013 }
1014 if (prime_test(in, out, trials, generator_wanted) != 0)
1015 fatal("modulus screening failed\n");
1016 return (0);
1017 }
1018
1019 arc4random_stir();
1020
1021 if (key_type_name == NULL) {
1022 printf("You must specify a key type (-t).\n");
1023 usage();
1024 }
1025 type = key_type_from_name(key_type_name);
1026 if (type == KEY_UNSPEC) {
1027 fprintf(stderr, "unknown key type %s\n", key_type_name);
1028 exit(1);
1029 }
1030 if (!quiet)
1031 printf("Generating public/private %s key pair.\n", key_type_name);
1032 private = key_generate(type, bits);
1033 if (private == NULL) {
1034 fprintf(stderr, "key_generate failed");
1035 exit(1);
1036 }
1037 public = key_from_private(private);
1038
1039 if (!have_identity)
1040 ask_filename(pw, "Enter file in which to save the key");
1041
1042 /* Create ~/.ssh directory if it doesn\'t already exist. */
1043 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1044 if (strstr(identity_file, dotsshdir) != NULL &&
1045 stat(dotsshdir, &st) < 0) {
1046 if (mkdir(dotsshdir, 0700) < 0)
1047 error("Could not create directory '%s'.", dotsshdir);
1048 else if (!quiet)
1049 printf("Created directory '%s'.\n", dotsshdir);
1050 }
1051 /* If the file already exists, ask the user to confirm. */
1052 if (stat(identity_file, &st) >= 0) {
1053 char yesno[3];
1054 printf("%s already exists.\n", identity_file);
1055 printf("Overwrite (y/n)? ");
1056 fflush(stdout);
1057 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1058 exit(1);
1059 if (yesno[0] != 'y' && yesno[0] != 'Y')
1060 exit(1);
1061 }
1062 /* Ask for a passphrase (twice). */
1063 if (identity_passphrase)
1064 passphrase1 = xstrdup(identity_passphrase);
1065 else if (identity_new_passphrase)
1066 passphrase1 = xstrdup(identity_new_passphrase);
1067 else {
1068 passphrase_again:
1069 passphrase1 =
1070 read_passphrase("Enter passphrase (empty for no "
1071 "passphrase): ", RP_ALLOW_STDIN);
1072 passphrase2 = read_passphrase("Enter same passphrase again: ",
1073 RP_ALLOW_STDIN);
1074 if (strcmp(passphrase1, passphrase2) != 0) {
1075 /*
1076 * The passphrases do not match. Clear them and
1077 * retry.
1078 */
1079 memset(passphrase1, 0, strlen(passphrase1));
1080 memset(passphrase2, 0, strlen(passphrase2));
1081 xfree(passphrase1);
1082 xfree(passphrase2);
1083 printf("Passphrases do not match. Try again.\n");
1084 goto passphrase_again;
1085 }
1086 /* Clear the other copy of the passphrase. */
1087 memset(passphrase2, 0, strlen(passphrase2));
1088 xfree(passphrase2);
1089 }
1090
1091 if (identity_comment) {
1092 strlcpy(comment, identity_comment, sizeof(comment));
1093 } else {
1094 /* Create default commend field for the passphrase. */
1095 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1096 }
1097
1098 /* Save the key with the given passphrase and comment. */
1099 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1100 printf("Saving the key failed: %s.\n", identity_file);
1101 memset(passphrase1, 0, strlen(passphrase1));
1102 xfree(passphrase1);
1103 exit(1);
1104 }
1105 /* Clear the passphrase. */
1106 memset(passphrase1, 0, strlen(passphrase1));
1107 xfree(passphrase1);
1108
1109 /* Clear the private key and the random number generator. */
1110 key_free(private);
1111 arc4random_stir();
1112
1113 if (!quiet)
1114 printf("Your identification has been saved in %s.\n", identity_file);
1115
1116 strlcat(identity_file, ".pub", sizeof(identity_file));
1117 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1118 if (fd == -1) {
1119 printf("Could not save your public key in %s\n", identity_file);
1120 exit(1);
1121 }
1122 f = fdopen(fd, "w");
1123 if (f == NULL) {
1124 printf("fdopen %s failed", identity_file);
1125 exit(1);
1126 }
1127 if (!key_write(public, f))
1128 fprintf(stderr, "write key failed");
1129 fprintf(f, " %s\n", comment);
1130 fclose(f);
1131
1132 if (!quiet) {
1133 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1134 printf("Your public key has been saved in %s.\n",
1135 identity_file);
1136 printf("The key fingerprint is:\n");
1137 printf("%s %s\n", fp, comment);
1138 xfree(fp);
1139 }
1140
1141 key_free(public);
1142 exit(0);
1143 }
DragonFly BSD