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3c0ef626 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"
70791e56 15RCSID("$OpenBSD: ssh-keygen.c,v 1.108 2003/08/14 16:08:58 markus Exp $");
3c0ef626 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"
70791e56 30#include "moduli.h"
3c0ef626 31
32#ifdef SMARTCARD
3c0ef626 33#include "scard.h"
34#endif
70791e56 35#ifdef DNS
36#include "dns.h"
37#endif
3c0ef626 38
39/* Number of bits in the RSA/DSA key. This value can be changed on the command line. */
40int bits = 1024;
41
42/*
43 * Flag indicating that we just want to change the passphrase. This can be
44 * set on the command line.
45 */
46int change_passphrase = 0;
47
48/*
49 * Flag indicating that we just want to change the comment. This can be set
50 * on the command line.
51 */
52int change_comment = 0;
53
54int quiet = 0;
55
56/* Flag indicating that we just want to see the key fingerprint */
57int print_fingerprint = 0;
58int print_bubblebabble = 0;
59
60/* The identity file name, given on the command line or entered by the user. */
61char identity_file[1024];
62int have_identity = 0;
63
64/* This is set to the passphrase if given on the command line. */
65char *identity_passphrase = NULL;
66
67/* This is set to the new passphrase if given on the command line. */
68char *identity_new_passphrase = NULL;
69
70/* This is set to the new comment if given on the command line. */
71char *identity_comment = NULL;
72
73/* Dump public key file in format used by real and the original SSH 2 */
74int convert_to_ssh2 = 0;
75int convert_from_ssh2 = 0;
76int print_public = 0;
70791e56 77int print_generic = 0;
3c0ef626 78
e9a17296 79char *key_type_name = NULL;
3c0ef626 80
81/* argv0 */
82#ifdef HAVE___PROGNAME
83extern char *__progname;
84#else
85char *__progname;
86#endif
87
88char hostname[MAXHOSTNAMELEN];
89
90static void
91ask_filename(struct passwd *pw, const char *prompt)
92{
93 char buf[1024];
94 char *name = NULL;
95
e9a17296 96 if (key_type_name == NULL)
3c0ef626 97 name = _PATH_SSH_CLIENT_ID_RSA;
e9a17296 98 else
99 switch (key_type_from_name(key_type_name)) {
100 case KEY_RSA1:
101 name = _PATH_SSH_CLIENT_IDENTITY;
102 break;
103 case KEY_DSA:
104 name = _PATH_SSH_CLIENT_ID_DSA;
105 break;
106 case KEY_RSA:
107 name = _PATH_SSH_CLIENT_ID_RSA;
108 break;
109 default:
110 fprintf(stderr, "bad key type");
111 exit(1);
112 break;
113 }
114
3c0ef626 115 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
116 fprintf(stderr, "%s (%s): ", prompt, identity_file);
3c0ef626 117 if (fgets(buf, sizeof(buf), stdin) == NULL)
118 exit(1);
119 if (strchr(buf, '\n'))
120 *strchr(buf, '\n') = 0;
121 if (strcmp(buf, "") != 0)
122 strlcpy(identity_file, buf, sizeof(identity_file));
123 have_identity = 1;
124}
125
126static Key *
127load_identity(char *filename)
128{
129 char *pass;
130 Key *prv;
131
132 prv = key_load_private(filename, "", NULL);
133 if (prv == NULL) {
134 if (identity_passphrase)
135 pass = xstrdup(identity_passphrase);
136 else
137 pass = read_passphrase("Enter passphrase: ",
138 RP_ALLOW_STDIN);
139 prv = key_load_private(filename, pass, NULL);
140 memset(pass, 0, strlen(pass));
141 xfree(pass);
142 }
143 return prv;
144}
145
146#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
ff2d7a98 147#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
3c0ef626 148#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
149#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
150
151static void
152do_convert_to_ssh2(struct passwd *pw)
153{
154 Key *k;
e9a17296 155 u_int len;
3c0ef626 156 u_char *blob;
157 struct stat st;
158
159 if (!have_identity)
160 ask_filename(pw, "Enter file in which the key is");
161 if (stat(identity_file, &st) < 0) {
162 perror(identity_file);
163 exit(1);
164 }
165 if ((k = key_load_public(identity_file, NULL)) == NULL) {
166 if ((k = load_identity(identity_file)) == NULL) {
167 fprintf(stderr, "load failed\n");
168 exit(1);
169 }
170 }
70791e56 171 if (k->type == KEY_RSA1) {
172 fprintf(stderr, "version 1 keys are not supported\n");
173 exit(1);
174 }
3c0ef626 175 if (key_to_blob(k, &blob, &len) <= 0) {
176 fprintf(stderr, "key_to_blob failed\n");
177 exit(1);
178 }
179 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
180 fprintf(stdout,
ff2d7a98 181 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
3c0ef626 182 key_size(k), key_type(k),
183 pw->pw_name, hostname);
184 dump_base64(stdout, blob, len);
185 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
186 key_free(k);
187 xfree(blob);
188 exit(0);
189}
190
191static void
192buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
193{
194 int bits = buffer_get_int(b);
195 int bytes = (bits + 7) / 8;
196
197 if (buffer_len(b) < bytes)
198 fatal("buffer_get_bignum_bits: input buffer too small: "
199 "need %d have %d", bytes, buffer_len(b));
e9a17296 200 BN_bin2bn(buffer_ptr(b), bytes, value);
3c0ef626 201 buffer_consume(b, bytes);
202}
203
204static Key *
e9a17296 205do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
3c0ef626 206{
207 Buffer b;
208 Key *key = NULL;
209 char *type, *cipher;
210 u_char *sig, data[] = "abcde12345";
211 int magic, rlen, ktype, i1, i2, i3, i4;
212 u_int slen;
213 u_long e;
214
215 buffer_init(&b);
216 buffer_append(&b, blob, blen);
217
218 magic = buffer_get_int(&b);
219 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
220 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
221 buffer_free(&b);
222 return NULL;
223 }
224 i1 = buffer_get_int(&b);
225 type = buffer_get_string(&b, NULL);
226 cipher = buffer_get_string(&b, NULL);
227 i2 = buffer_get_int(&b);
228 i3 = buffer_get_int(&b);
229 i4 = buffer_get_int(&b);
230 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
231 if (strcmp(cipher, "none") != 0) {
232 error("unsupported cipher %s", cipher);
233 xfree(cipher);
234 buffer_free(&b);
235 xfree(type);
236 return NULL;
237 }
238 xfree(cipher);
239
240 if (strstr(type, "dsa")) {
241 ktype = KEY_DSA;
242 } else if (strstr(type, "rsa")) {
243 ktype = KEY_RSA;
244 } else {
245 xfree(type);
246 return NULL;
247 }
248 key = key_new_private(ktype);
249 xfree(type);
250
251 switch (key->type) {
252 case KEY_DSA:
253 buffer_get_bignum_bits(&b, key->dsa->p);
254 buffer_get_bignum_bits(&b, key->dsa->g);
255 buffer_get_bignum_bits(&b, key->dsa->q);
256 buffer_get_bignum_bits(&b, key->dsa->pub_key);
257 buffer_get_bignum_bits(&b, key->dsa->priv_key);
258 break;
259 case KEY_RSA:
260 e = buffer_get_char(&b);
261 debug("e %lx", e);
262 if (e < 30) {
263 e <<= 8;
264 e += buffer_get_char(&b);
265 debug("e %lx", e);
266 e <<= 8;
267 e += buffer_get_char(&b);
268 debug("e %lx", e);
269 }
270 if (!BN_set_word(key->rsa->e, e)) {
271 buffer_free(&b);
272 key_free(key);
273 return NULL;
274 }
275 buffer_get_bignum_bits(&b, key->rsa->d);
276 buffer_get_bignum_bits(&b, key->rsa->n);
277 buffer_get_bignum_bits(&b, key->rsa->iqmp);
278 buffer_get_bignum_bits(&b, key->rsa->q);
279 buffer_get_bignum_bits(&b, key->rsa->p);
280 rsa_generate_additional_parameters(key->rsa);
281 break;
282 }
283 rlen = buffer_len(&b);
e9a17296 284 if (rlen != 0)
3c0ef626 285 error("do_convert_private_ssh2_from_blob: "
286 "remaining bytes in key blob %d", rlen);
287 buffer_free(&b);
288
289 /* try the key */
290 key_sign(key, &sig, &slen, data, sizeof(data));
291 key_verify(key, sig, slen, data, sizeof(data));
292 xfree(sig);
293 return key;
294}
295
296static void
297do_convert_from_ssh2(struct passwd *pw)
298{
299 Key *k;
300 int blen;
2980ea68 301 u_int len;
3c0ef626 302 char line[1024], *p;
303 u_char blob[8096];
304 char encoded[8096];
305 struct stat st;
306 int escaped = 0, private = 0, ok;
307 FILE *fp;
308
309 if (!have_identity)
310 ask_filename(pw, "Enter file in which the key is");
311 if (stat(identity_file, &st) < 0) {
312 perror(identity_file);
313 exit(1);
314 }
315 fp = fopen(identity_file, "r");
316 if (fp == NULL) {
317 perror(identity_file);
318 exit(1);
319 }
320 encoded[0] = '\0';
321 while (fgets(line, sizeof(line), fp)) {
322 if (!(p = strchr(line, '\n'))) {
323 fprintf(stderr, "input line too long.\n");
324 exit(1);
325 }
326 if (p > line && p[-1] == '\\')
327 escaped++;
328 if (strncmp(line, "----", 4) == 0 ||
329 strstr(line, ": ") != NULL) {
330 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
331 private = 1;
332 if (strstr(line, " END ") != NULL) {
333 break;
334 }
335 /* fprintf(stderr, "ignore: %s", line); */
336 continue;
337 }
338 if (escaped) {
339 escaped--;
340 /* fprintf(stderr, "escaped: %s", line); */
341 continue;
342 }
343 *p = '\0';
344 strlcat(encoded, line, sizeof(encoded));
345 }
2980ea68 346 len = strlen(encoded);
347 if (((len % 4) == 3) &&
348 (encoded[len-1] == '=') &&
349 (encoded[len-2] == '=') &&
350 (encoded[len-3] == '='))
351 encoded[len-3] = '\0';
e9a17296 352 blen = uudecode(encoded, blob, sizeof(blob));
3c0ef626 353 if (blen < 0) {
354 fprintf(stderr, "uudecode failed.\n");
355 exit(1);
356 }
357 k = private ?
358 do_convert_private_ssh2_from_blob(blob, blen) :
359 key_from_blob(blob, blen);
360 if (k == NULL) {
361 fprintf(stderr, "decode blob failed.\n");
362 exit(1);
363 }
364 ok = private ?
365 (k->type == KEY_DSA ?
366 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
367 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
368 key_write(k, stdout);
369 if (!ok) {
370 fprintf(stderr, "key write failed");
371 exit(1);
372 }
373 key_free(k);
e9a17296 374 if (!private)
375 fprintf(stdout, "\n");
3c0ef626 376 fclose(fp);
377 exit(0);
378}
379
380static void
381do_print_public(struct passwd *pw)
382{
383 Key *prv;
384 struct stat st;
385
386 if (!have_identity)
387 ask_filename(pw, "Enter file in which the key is");
388 if (stat(identity_file, &st) < 0) {
389 perror(identity_file);
390 exit(1);
391 }
392 prv = load_identity(identity_file);
393 if (prv == NULL) {
394 fprintf(stderr, "load failed\n");
395 exit(1);
396 }
397 if (!key_write(prv, stdout))
398 fprintf(stderr, "key_write failed");
399 key_free(prv);
400 fprintf(stdout, "\n");
401 exit(0);
402}
403
404#ifdef SMARTCARD
3c0ef626 405static void
406do_upload(struct passwd *pw, const char *sc_reader_id)
407{
408 Key *prv = NULL;
409 struct stat st;
2980ea68 410 int ret;
411
3c0ef626 412 if (!have_identity)
413 ask_filename(pw, "Enter file in which the key is");
414 if (stat(identity_file, &st) < 0) {
415 perror(identity_file);
2980ea68 416 exit(1);
3c0ef626 417 }
418 prv = load_identity(identity_file);
419 if (prv == NULL) {
420 error("load failed");
2980ea68 421 exit(1);
3c0ef626 422 }
2980ea68 423 ret = sc_put_key(prv, sc_reader_id);
424 key_free(prv);
425 if (ret < 0)
426 exit(1);
70791e56 427 logit("loading key done");
2980ea68 428 exit(0);
3c0ef626 429}
430
431static void
432do_download(struct passwd *pw, const char *sc_reader_id)
433{
2980ea68 434 Key **keys = NULL;
435 int i;
3c0ef626 436
2980ea68 437 keys = sc_get_keys(sc_reader_id, NULL);
438 if (keys == NULL)
3c0ef626 439 fatal("cannot read public key from smartcard");
2980ea68 440 for (i = 0; keys[i]; i++) {
441 key_write(keys[i], stdout);
442 key_free(keys[i]);
443 fprintf(stdout, "\n");
444 }
445 xfree(keys);
3c0ef626 446 exit(0);
447}
448#endif /* SMARTCARD */
449
450static void
451do_fingerprint(struct passwd *pw)
452{
453 FILE *f;
454 Key *public;
455 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
e9a17296 456 int i, skip = 0, num = 1, invalid = 1;
457 enum fp_rep rep;
458 enum fp_type fptype;
3c0ef626 459 struct stat st;
460
461 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
462 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
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 public = key_load_public(identity_file, &comment);
471 if (public != NULL) {
472 fp = key_fingerprint(public, fptype, rep);
ff2d7a98 473 printf("%u %s %s\n", key_size(public), fp, comment);
3c0ef626 474 key_free(public);
475 xfree(comment);
476 xfree(fp);
477 exit(0);
478 }
479 if (comment)
480 xfree(comment);
481
482 f = fopen(identity_file, "r");
483 if (f != NULL) {
484 while (fgets(line, sizeof(line), f)) {
485 i = strlen(line) - 1;
486 if (line[i] != '\n') {
487 error("line %d too long: %.40s...", num, line);
488 skip = 1;
489 continue;
490 }
491 num++;
492 if (skip) {
493 skip = 0;
494 continue;
495 }
496 line[i] = '\0';
497
498 /* Skip leading whitespace, empty and comment lines. */
499 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
500 ;
501 if (!*cp || *cp == '\n' || *cp == '#')
502 continue ;
503 i = strtol(cp, &ep, 10);
504 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
505 int quoted = 0;
506 comment = cp;
ff2d7a98 507 for (; *cp && (quoted || (*cp != ' ' &&
508 *cp != '\t')); cp++) {
3c0ef626 509 if (*cp == '\\' && cp[1] == '"')
510 cp++; /* Skip both */
511 else if (*cp == '"')
512 quoted = !quoted;
513 }
514 if (!*cp)
515 continue;
516 *cp++ = '\0';
517 }
518 ep = cp;
519 public = key_new(KEY_RSA1);
520 if (key_read(public, &cp) != 1) {
521 cp = ep;
522 key_free(public);
523 public = key_new(KEY_UNSPEC);
524 if (key_read(public, &cp) != 1) {
525 key_free(public);
526 continue;
527 }
528 }
529 comment = *cp ? cp : comment;
530 fp = key_fingerprint(public, fptype, rep);
ff2d7a98 531 printf("%u %s %s\n", key_size(public), fp,
3c0ef626 532 comment ? comment : "no comment");
533 xfree(fp);
534 key_free(public);
535 invalid = 0;
536 }
537 fclose(f);
538 }
539 if (invalid) {
540 printf("%s is not a public key file.\n", identity_file);
541 exit(1);
542 }
543 exit(0);
544}
545
546/*
547 * Perform changing a passphrase. The argument is the passwd structure
548 * for the current user.
549 */
550static void
551do_change_passphrase(struct passwd *pw)
552{
553 char *comment;
554 char *old_passphrase, *passphrase1, *passphrase2;
555 struct stat st;
556 Key *private;
557
558 if (!have_identity)
559 ask_filename(pw, "Enter file in which the key is");
560 if (stat(identity_file, &st) < 0) {
561 perror(identity_file);
562 exit(1);
563 }
564 /* Try to load the file with empty passphrase. */
565 private = key_load_private(identity_file, "", &comment);
566 if (private == NULL) {
567 if (identity_passphrase)
568 old_passphrase = xstrdup(identity_passphrase);
569 else
570 old_passphrase =
571 read_passphrase("Enter old passphrase: ",
572 RP_ALLOW_STDIN);
573 private = key_load_private(identity_file, old_passphrase,
574 &comment);
575 memset(old_passphrase, 0, strlen(old_passphrase));
576 xfree(old_passphrase);
577 if (private == NULL) {
578 printf("Bad passphrase.\n");
579 exit(1);
580 }
581 }
582 printf("Key has comment '%s'\n", comment);
583
584 /* Ask the new passphrase (twice). */
585 if (identity_new_passphrase) {
586 passphrase1 = xstrdup(identity_new_passphrase);
587 passphrase2 = NULL;
588 } else {
589 passphrase1 =
590 read_passphrase("Enter new passphrase (empty for no "
591 "passphrase): ", RP_ALLOW_STDIN);
592 passphrase2 = read_passphrase("Enter same passphrase again: ",
e9a17296 593 RP_ALLOW_STDIN);
3c0ef626 594
595 /* Verify that they are the same. */
596 if (strcmp(passphrase1, passphrase2) != 0) {
597 memset(passphrase1, 0, strlen(passphrase1));
598 memset(passphrase2, 0, strlen(passphrase2));
599 xfree(passphrase1);
600 xfree(passphrase2);
601 printf("Pass phrases do not match. Try again.\n");
602 exit(1);
603 }
604 /* Destroy the other copy. */
605 memset(passphrase2, 0, strlen(passphrase2));
606 xfree(passphrase2);
607 }
608
609 /* Save the file using the new passphrase. */
610 if (!key_save_private(private, identity_file, passphrase1, comment)) {
611 printf("Saving the key failed: %s.\n", identity_file);
612 memset(passphrase1, 0, strlen(passphrase1));
613 xfree(passphrase1);
614 key_free(private);
615 xfree(comment);
616 exit(1);
617 }
618 /* Destroy the passphrase and the copy of the key in memory. */
619 memset(passphrase1, 0, strlen(passphrase1));
620 xfree(passphrase1);
621 key_free(private); /* Destroys contents */
622 xfree(comment);
623
624 printf("Your identification has been saved with the new passphrase.\n");
625 exit(0);
626}
627
70791e56 628#ifdef DNS
629/*
630 * Print the SSHFP RR.
631 */
632static void
633do_print_resource_record(struct passwd *pw, char *hostname)
634{
635 Key *public;
636 char *comment = NULL;
637 struct stat st;
638
639 if (!have_identity)
640 ask_filename(pw, "Enter file in which the key is");
641 if (stat(identity_file, &st) < 0) {
642 perror(identity_file);
643 exit(1);
644 }
645 public = key_load_public(identity_file, &comment);
646 if (public != NULL) {
647 export_dns_rr(hostname, public, stdout, print_generic);
648 key_free(public);
649 xfree(comment);
650 exit(0);
651 }
652 if (comment)
653 xfree(comment);
654
655 printf("failed to read v2 public key from %s.\n", identity_file);
656 exit(1);
657}
658#endif /* DNS */
659
3c0ef626 660/*
661 * Change the comment of a private key file.
662 */
663static void
664do_change_comment(struct passwd *pw)
665{
666 char new_comment[1024], *comment, *passphrase;
667 Key *private;
668 Key *public;
669 struct stat st;
670 FILE *f;
671 int fd;
672
673 if (!have_identity)
674 ask_filename(pw, "Enter file in which the key is");
675 if (stat(identity_file, &st) < 0) {
676 perror(identity_file);
677 exit(1);
678 }
679 private = key_load_private(identity_file, "", &comment);
680 if (private == NULL) {
681 if (identity_passphrase)
682 passphrase = xstrdup(identity_passphrase);
683 else if (identity_new_passphrase)
684 passphrase = xstrdup(identity_new_passphrase);
685 else
686 passphrase = read_passphrase("Enter passphrase: ",
687 RP_ALLOW_STDIN);
688 /* Try to load using the passphrase. */
689 private = key_load_private(identity_file, passphrase, &comment);
690 if (private == NULL) {
691 memset(passphrase, 0, strlen(passphrase));
692 xfree(passphrase);
693 printf("Bad passphrase.\n");
694 exit(1);
695 }
696 } else {
697 passphrase = xstrdup("");
698 }
699 if (private->type != KEY_RSA1) {
700 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
701 key_free(private);
702 exit(1);
e9a17296 703 }
3c0ef626 704 printf("Key now has comment '%s'\n", comment);
705
706 if (identity_comment) {
707 strlcpy(new_comment, identity_comment, sizeof(new_comment));
708 } else {
709 printf("Enter new comment: ");
710 fflush(stdout);
711 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
712 memset(passphrase, 0, strlen(passphrase));
713 key_free(private);
714 exit(1);
715 }
716 if (strchr(new_comment, '\n'))
717 *strchr(new_comment, '\n') = 0;
718 }
719
720 /* Save the file using the new passphrase. */
721 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
722 printf("Saving the key failed: %s.\n", identity_file);
723 memset(passphrase, 0, strlen(passphrase));
724 xfree(passphrase);
725 key_free(private);
726 xfree(comment);
727 exit(1);
728 }
729 memset(passphrase, 0, strlen(passphrase));
730 xfree(passphrase);
731 public = key_from_private(private);
732 key_free(private);
733
734 strlcat(identity_file, ".pub", sizeof(identity_file));
735 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
736 if (fd == -1) {
737 printf("Could not save your public key in %s\n", identity_file);
738 exit(1);
739 }
740 f = fdopen(fd, "w");
741 if (f == NULL) {
742 printf("fdopen %s failed", identity_file);
743 exit(1);
744 }
745 if (!key_write(public, f))
746 fprintf(stderr, "write key failed");
747 key_free(public);
748 fprintf(f, " %s\n", new_comment);
749 fclose(f);
750
751 xfree(comment);
752
753 printf("The comment in your key file has been changed.\n");
754 exit(0);
755}
756
757static void
758usage(void)
759{
760 fprintf(stderr, "Usage: %s [options]\n", __progname);
761 fprintf(stderr, "Options:\n");
762 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
763 fprintf(stderr, " -c Change comment in private and public key files.\n");
764 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
765 fprintf(stderr, " -f filename Filename of the key file.\n");
70791e56 766 fprintf(stderr, " -g Use generic DNS resource record format.\n");
3c0ef626 767 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
768 fprintf(stderr, " -l Show fingerprint of key file.\n");
769 fprintf(stderr, " -p Change passphrase of private key file.\n");
770 fprintf(stderr, " -q Quiet.\n");
771 fprintf(stderr, " -y Read private key file and print public key.\n");
772 fprintf(stderr, " -t type Specify type of key to create.\n");
773 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
774 fprintf(stderr, " -C comment Provide new comment.\n");
775 fprintf(stderr, " -N phrase Provide new passphrase.\n");
776 fprintf(stderr, " -P phrase Provide old passphrase.\n");
70791e56 777#ifdef DNS
778 fprintf(stderr, " -r hostname Print DNS resource record.\n");
779#endif /* DNS */
3c0ef626 780#ifdef SMARTCARD
781 fprintf(stderr, " -D reader Download public key from smartcard.\n");
782 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
783#endif /* SMARTCARD */
784
70791e56 785 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n");
786 fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n");
787
3c0ef626 788 exit(1);
789}
790
791/*
792 * Main program for key management.
793 */
794int
795main(int ac, char **av)
796{
e9a17296 797 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
70791e56 798 char out_file[MAXPATHLEN], *reader_id = NULL;
799 char *resource_record_hostname = NULL;
3c0ef626 800 Key *private, *public;
801 struct passwd *pw;
802 struct stat st;
70791e56 803 int opt, type, fd, download = 0, memory = 0;
804 int generator_wanted = 0, trials = 100;
805 int do_gen_candidates = 0, do_screen_candidates = 0;
806 BIGNUM *start = NULL;
3c0ef626 807 FILE *f;
808
809 extern int optind;
810 extern char *optarg;
811
70791e56 812 __progname = ssh_get_progname(av[0]);
1b2ae391 813 init_pathnames();
3c0ef626 814
815 SSLeay_add_all_algorithms();
70791e56 816 log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
817
e54b3d7c 818 init_rng();
819 seed_rng();
3c0ef626 820
821 /* we need this for the home * directory. */
822 pw = getpwuid(getuid());
823 if (!pw) {
824 printf("You don't exist, go away!\n");
825 exit(1);
826 }
827 if (gethostname(hostname, sizeof(hostname)) < 0) {
828 perror("gethostname");
829 exit(1);
830 }
831
70791e56 832 while ((opt = getopt(ac, av,
833 "degiqpclBRxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) {
3c0ef626 834 switch (opt) {
835 case 'b':
836 bits = atoi(optarg);
837 if (bits < 512 || bits > 32768) {
838 printf("Bits has bad value.\n");
839 exit(1);
840 }
841 break;
842 case 'l':
843 print_fingerprint = 1;
844 break;
845 case 'B':
846 print_bubblebabble = 1;
847 break;
848 case 'p':
849 change_passphrase = 1;
850 break;
851 case 'c':
852 change_comment = 1;
853 break;
854 case 'f':
855 strlcpy(identity_file, optarg, sizeof(identity_file));
856 have_identity = 1;
857 break;
70791e56 858 case 'g':
859 print_generic = 1;
860 break;
3c0ef626 861 case 'P':
862 identity_passphrase = optarg;
863 break;
864 case 'N':
865 identity_new_passphrase = optarg;
866 break;
867 case 'C':
868 identity_comment = optarg;
869 break;
870 case 'q':
871 quiet = 1;
872 break;
873 case 'R':
874 /* unused */
875 exit(0);
876 break;
877 case 'e':
878 case 'x':
879 /* export key */
880 convert_to_ssh2 = 1;
881 break;
882 case 'i':
883 case 'X':
884 /* import key */
885 convert_from_ssh2 = 1;
886 break;
887 case 'y':
888 print_public = 1;
889 break;
890 case 'd':
891 key_type_name = "dsa";
892 break;
893 case 't':
894 key_type_name = optarg;
895 break;
896 case 'D':
897 download = 1;
898 case 'U':
899 reader_id = optarg;
900 break;
70791e56 901 case 'r':
902 resource_record_hostname = optarg;
903 break;
904 case 'W':
905 generator_wanted = atoi(optarg);
906 if (generator_wanted < 1)
907 fatal("Desired generator has bad value.");
908 break;
909 case 'a':
910 trials = atoi(optarg);
911 if (trials < TRIAL_MINIMUM) {
912 fatal("Minimum primality trials is %d",
913 TRIAL_MINIMUM);
914 }
915 break;
916 case 'M':
917 memory = atoi(optarg);
918 if (memory != 0 &&
919 (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) {
920 fatal("Invalid memory amount (min %ld, max %ld)",
921 LARGE_MINIMUM, LARGE_MAXIMUM);
922 }
923 break;
924 case 'G':
925 do_gen_candidates = 1;
926 strlcpy(out_file, optarg, sizeof(out_file));
927 break;
928 case 'T':
929 do_screen_candidates = 1;
930 strlcpy(out_file, optarg, sizeof(out_file));
931 break;
932 case 'S':
933 /* XXX - also compare length against bits */
934 if (BN_hex2bn(&start, optarg) == 0)
935 fatal("Invalid start point.");
936 break;
3c0ef626 937 case '?':
938 default:
939 usage();
940 }
941 }
942 if (optind < ac) {
943 printf("Too many arguments.\n");
944 usage();
945 }
946 if (change_passphrase && change_comment) {
947 printf("Can only have one of -p and -c.\n");
948 usage();
949 }
950 if (print_fingerprint || print_bubblebabble)
951 do_fingerprint(pw);
952 if (change_passphrase)
953 do_change_passphrase(pw);
2980ea68 954 if (change_comment)
955 do_change_comment(pw);
e54b3d7c 956 if (convert_to_ssh2)
957 do_convert_to_ssh2(pw);
958 if (convert_from_ssh2)
959 do_convert_from_ssh2(pw);
3c0ef626 960 if (print_public)
961 do_print_public(pw);
70791e56 962 if (resource_record_hostname != NULL) {
963#ifdef DNS
964 do_print_resource_record(pw, resource_record_hostname);
965#else /* DNS */
966 fatal("no DNS support.");
967#endif /* DNS */
968 }
3c0ef626 969 if (reader_id != NULL) {
970#ifdef SMARTCARD
971 if (download)
972 do_download(pw, reader_id);
973 else
974 do_upload(pw, reader_id);
975#else /* SMARTCARD */
976 fatal("no support for smartcards.");
977#endif /* SMARTCARD */
978 }
979
70791e56 980 if (do_gen_candidates) {
981 FILE *out = fopen(out_file, "w");
982
983 if (out == NULL) {
984 error("Couldn't open modulus candidate file \"%s\": %s",
985 out_file, strerror(errno));
986 return (1);
987 }
988 if (gen_candidates(out, memory, bits, start) != 0)
989 fatal("modulus candidate generation failed\n");
990
991 return (0);
992 }
993
994 if (do_screen_candidates) {
995 FILE *in;
996 FILE *out = fopen(out_file, "w");
997
998 if (have_identity && strcmp(identity_file, "-") != 0) {
999 if ((in = fopen(identity_file, "r")) == NULL) {
1000 fatal("Couldn't open modulus candidate "
1001 "file \"%s\": %s", identity_file,
1002 strerror(errno));
1003 }
1004 } else
1005 in = stdin;
1006
1007 if (out == NULL) {
1008 fatal("Couldn't open moduli file \"%s\": %s",
1009 out_file, strerror(errno));
1010 }
1011 if (prime_test(in, out, trials, generator_wanted) != 0)
1012 fatal("modulus screening failed\n");
1013 return (0);
1014 }
1015
3c0ef626 1016 arc4random_stir();
1017
e9a17296 1018 if (key_type_name == NULL) {
1019 printf("You must specify a key type (-t).\n");
1020 usage();
1021 }
3c0ef626 1022 type = key_type_from_name(key_type_name);
1023 if (type == KEY_UNSPEC) {
1024 fprintf(stderr, "unknown key type %s\n", key_type_name);
1025 exit(1);
1026 }
1027 if (!quiet)
1028 printf("Generating public/private %s key pair.\n", key_type_name);
1029 private = key_generate(type, bits);
1030 if (private == NULL) {
1031 fprintf(stderr, "key_generate failed");
1032 exit(1);
1033 }
1034 public = key_from_private(private);
1035
1036 if (!have_identity)
1037 ask_filename(pw, "Enter file in which to save the key");
1038
1039 /* Create ~/.ssh directory if it doesn\'t already exist. */
1040 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
1041 if (strstr(identity_file, dotsshdir) != NULL &&
1042 stat(dotsshdir, &st) < 0) {
1043 if (mkdir(dotsshdir, 0700) < 0)
1044 error("Could not create directory '%s'.", dotsshdir);
1045 else if (!quiet)
1046 printf("Created directory '%s'.\n", dotsshdir);
1047 }
1048 /* If the file already exists, ask the user to confirm. */
1049 if (stat(identity_file, &st) >= 0) {
1050 char yesno[3];
1051 printf("%s already exists.\n", identity_file);
1052 printf("Overwrite (y/n)? ");
1053 fflush(stdout);
1054 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
1055 exit(1);
1056 if (yesno[0] != 'y' && yesno[0] != 'Y')
1057 exit(1);
1058 }
1059 /* Ask for a passphrase (twice). */
1060 if (identity_passphrase)
1061 passphrase1 = xstrdup(identity_passphrase);
1062 else if (identity_new_passphrase)
1063 passphrase1 = xstrdup(identity_new_passphrase);
1064 else {
1065passphrase_again:
1066 passphrase1 =
1067 read_passphrase("Enter passphrase (empty for no "
1068 "passphrase): ", RP_ALLOW_STDIN);
1069 passphrase2 = read_passphrase("Enter same passphrase again: ",
1070 RP_ALLOW_STDIN);
1071 if (strcmp(passphrase1, passphrase2) != 0) {
1072 /*
1073 * The passphrases do not match. Clear them and
1074 * retry.
1075 */
1076 memset(passphrase1, 0, strlen(passphrase1));
1077 memset(passphrase2, 0, strlen(passphrase2));
1078 xfree(passphrase1);
1079 xfree(passphrase2);
1080 printf("Passphrases do not match. Try again.\n");
1081 goto passphrase_again;
1082 }
1083 /* Clear the other copy of the passphrase. */
1084 memset(passphrase2, 0, strlen(passphrase2));
1085 xfree(passphrase2);
1086 }
1087
1088 if (identity_comment) {
1089 strlcpy(comment, identity_comment, sizeof(comment));
1090 } else {
1091 /* Create default commend field for the passphrase. */
1092 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1093 }
1094
1095 /* Save the key with the given passphrase and comment. */
1096 if (!key_save_private(private, identity_file, passphrase1, comment)) {
1097 printf("Saving the key failed: %s.\n", identity_file);
1098 memset(passphrase1, 0, strlen(passphrase1));
1099 xfree(passphrase1);
1100 exit(1);
1101 }
1102 /* Clear the passphrase. */
1103 memset(passphrase1, 0, strlen(passphrase1));
1104 xfree(passphrase1);
1105
1106 /* Clear the private key and the random number generator. */
1107 key_free(private);
1108 arc4random_stir();
1109
1110 if (!quiet)
1111 printf("Your identification has been saved in %s.\n", identity_file);
1112
1113 strlcat(identity_file, ".pub", sizeof(identity_file));
1114 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1115 if (fd == -1) {
1116 printf("Could not save your public key in %s\n", identity_file);
1117 exit(1);
1118 }
1119 f = fdopen(fd, "w");
1120 if (f == NULL) {
1121 printf("fdopen %s failed", identity_file);
1122 exit(1);
1123 }
1124 if (!key_write(public, f))
1125 fprintf(stderr, "write key failed");
1126 fprintf(f, " %s\n", comment);
1127 fclose(f);
1128
1129 if (!quiet) {
1130 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
1131 printf("Your public key has been saved in %s.\n",
1132 identity_file);
1133 printf("The key fingerprint is:\n");
1134 printf("%s %s\n", fp, comment);
1135 xfree(fp);
1136 }
1137
1138 key_free(public);
1139 exit(0);
1140}
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