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Import of OpenSSH 3.4p1
[gssapi-openssh.git] / openssh / ssh-keygen.c
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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"
680cee3b 15RCSID("$OpenBSD: ssh-keygen.c,v 1.101 2002/06/23 09:39:55 deraadt 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"
30
31#ifdef SMARTCARD
3c0ef626 32#include "scard.h"
33#endif
34
35/* Number of bits in the RSA/DSA key. This value can be changed on the command line. */
36int bits = 1024;
37
38/*
39 * Flag indicating that we just want to change the passphrase. This can be
40 * set on the command line.
41 */
42int change_passphrase = 0;
43
44/*
45 * Flag indicating that we just want to change the comment. This can be set
46 * on the command line.
47 */
48int change_comment = 0;
49
50int quiet = 0;
51
52/* Flag indicating that we just want to see the key fingerprint */
53int print_fingerprint = 0;
54int print_bubblebabble = 0;
55
56/* The identity file name, given on the command line or entered by the user. */
57char identity_file[1024];
58int have_identity = 0;
59
60/* This is set to the passphrase if given on the command line. */
61char *identity_passphrase = NULL;
62
63/* This is set to the new passphrase if given on the command line. */
64char *identity_new_passphrase = NULL;
65
66/* This is set to the new comment if given on the command line. */
67char *identity_comment = NULL;
68
69/* Dump public key file in format used by real and the original SSH 2 */
70int convert_to_ssh2 = 0;
71int convert_from_ssh2 = 0;
72int print_public = 0;
73
e9a17296 74char *key_type_name = NULL;
3c0ef626 75
76/* argv0 */
77#ifdef HAVE___PROGNAME
78extern char *__progname;
79#else
80char *__progname;
81#endif
82
83char hostname[MAXHOSTNAMELEN];
84
85static void
86ask_filename(struct passwd *pw, const char *prompt)
87{
88 char buf[1024];
89 char *name = NULL;
90
e9a17296 91 if (key_type_name == NULL)
3c0ef626 92 name = _PATH_SSH_CLIENT_ID_RSA;
e9a17296 93 else
94 switch (key_type_from_name(key_type_name)) {
95 case KEY_RSA1:
96 name = _PATH_SSH_CLIENT_IDENTITY;
97 break;
98 case KEY_DSA:
99 name = _PATH_SSH_CLIENT_ID_DSA;
100 break;
101 case KEY_RSA:
102 name = _PATH_SSH_CLIENT_ID_RSA;
103 break;
104 default:
105 fprintf(stderr, "bad key type");
106 exit(1);
107 break;
108 }
109
3c0ef626 110 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
111 fprintf(stderr, "%s (%s): ", prompt, identity_file);
112 fflush(stderr);
113 if (fgets(buf, sizeof(buf), stdin) == NULL)
114 exit(1);
115 if (strchr(buf, '\n'))
116 *strchr(buf, '\n') = 0;
117 if (strcmp(buf, "") != 0)
118 strlcpy(identity_file, buf, sizeof(identity_file));
119 have_identity = 1;
120}
121
122static Key *
123load_identity(char *filename)
124{
125 char *pass;
126 Key *prv;
127
128 prv = key_load_private(filename, "", NULL);
129 if (prv == NULL) {
130 if (identity_passphrase)
131 pass = xstrdup(identity_passphrase);
132 else
133 pass = read_passphrase("Enter passphrase: ",
134 RP_ALLOW_STDIN);
135 prv = key_load_private(filename, pass, NULL);
136 memset(pass, 0, strlen(pass));
137 xfree(pass);
138 }
139 return prv;
140}
141
142#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
f5799ae1 143#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
3c0ef626 144#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
145#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
146
147static void
148do_convert_to_ssh2(struct passwd *pw)
149{
150 Key *k;
e9a17296 151 u_int len;
3c0ef626 152 u_char *blob;
153 struct stat st;
154
155 if (!have_identity)
156 ask_filename(pw, "Enter file in which the key is");
157 if (stat(identity_file, &st) < 0) {
158 perror(identity_file);
159 exit(1);
160 }
161 if ((k = key_load_public(identity_file, NULL)) == NULL) {
162 if ((k = load_identity(identity_file)) == NULL) {
163 fprintf(stderr, "load failed\n");
164 exit(1);
165 }
166 }
167 if (key_to_blob(k, &blob, &len) <= 0) {
168 fprintf(stderr, "key_to_blob failed\n");
169 exit(1);
170 }
171 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
172 fprintf(stdout,
680cee3b 173 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
3c0ef626 174 key_size(k), key_type(k),
175 pw->pw_name, hostname);
176 dump_base64(stdout, blob, len);
177 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
178 key_free(k);
179 xfree(blob);
180 exit(0);
181}
182
183static void
184buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
185{
186 int bits = buffer_get_int(b);
187 int bytes = (bits + 7) / 8;
188
189 if (buffer_len(b) < bytes)
190 fatal("buffer_get_bignum_bits: input buffer too small: "
191 "need %d have %d", bytes, buffer_len(b));
e9a17296 192 BN_bin2bn(buffer_ptr(b), bytes, value);
3c0ef626 193 buffer_consume(b, bytes);
194}
195
196static Key *
e9a17296 197do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
3c0ef626 198{
199 Buffer b;
200 Key *key = NULL;
201 char *type, *cipher;
202 u_char *sig, data[] = "abcde12345";
203 int magic, rlen, ktype, i1, i2, i3, i4;
204 u_int slen;
205 u_long e;
206
207 buffer_init(&b);
208 buffer_append(&b, blob, blen);
209
210 magic = buffer_get_int(&b);
211 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
212 error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC);
213 buffer_free(&b);
214 return NULL;
215 }
216 i1 = buffer_get_int(&b);
217 type = buffer_get_string(&b, NULL);
218 cipher = buffer_get_string(&b, NULL);
219 i2 = buffer_get_int(&b);
220 i3 = buffer_get_int(&b);
221 i4 = buffer_get_int(&b);
222 debug("ignore (%d %d %d %d)", i1,i2,i3,i4);
223 if (strcmp(cipher, "none") != 0) {
224 error("unsupported cipher %s", cipher);
225 xfree(cipher);
226 buffer_free(&b);
227 xfree(type);
228 return NULL;
229 }
230 xfree(cipher);
231
232 if (strstr(type, "dsa")) {
233 ktype = KEY_DSA;
234 } else if (strstr(type, "rsa")) {
235 ktype = KEY_RSA;
236 } else {
237 xfree(type);
238 return NULL;
239 }
240 key = key_new_private(ktype);
241 xfree(type);
242
243 switch (key->type) {
244 case KEY_DSA:
245 buffer_get_bignum_bits(&b, key->dsa->p);
246 buffer_get_bignum_bits(&b, key->dsa->g);
247 buffer_get_bignum_bits(&b, key->dsa->q);
248 buffer_get_bignum_bits(&b, key->dsa->pub_key);
249 buffer_get_bignum_bits(&b, key->dsa->priv_key);
250 break;
251 case KEY_RSA:
252 e = buffer_get_char(&b);
253 debug("e %lx", e);
254 if (e < 30) {
255 e <<= 8;
256 e += buffer_get_char(&b);
257 debug("e %lx", e);
258 e <<= 8;
259 e += buffer_get_char(&b);
260 debug("e %lx", e);
261 }
262 if (!BN_set_word(key->rsa->e, e)) {
263 buffer_free(&b);
264 key_free(key);
265 return NULL;
266 }
267 buffer_get_bignum_bits(&b, key->rsa->d);
268 buffer_get_bignum_bits(&b, key->rsa->n);
269 buffer_get_bignum_bits(&b, key->rsa->iqmp);
270 buffer_get_bignum_bits(&b, key->rsa->q);
271 buffer_get_bignum_bits(&b, key->rsa->p);
272 rsa_generate_additional_parameters(key->rsa);
273 break;
274 }
275 rlen = buffer_len(&b);
e9a17296 276 if (rlen != 0)
3c0ef626 277 error("do_convert_private_ssh2_from_blob: "
278 "remaining bytes in key blob %d", rlen);
279 buffer_free(&b);
280
281 /* try the key */
282 key_sign(key, &sig, &slen, data, sizeof(data));
283 key_verify(key, sig, slen, data, sizeof(data));
284 xfree(sig);
285 return key;
286}
287
288static void
289do_convert_from_ssh2(struct passwd *pw)
290{
291 Key *k;
292 int blen;
700318f3 293 u_int len;
3c0ef626 294 char line[1024], *p;
295 u_char blob[8096];
296 char encoded[8096];
297 struct stat st;
298 int escaped = 0, private = 0, ok;
299 FILE *fp;
300
301 if (!have_identity)
302 ask_filename(pw, "Enter file in which the key is");
303 if (stat(identity_file, &st) < 0) {
304 perror(identity_file);
305 exit(1);
306 }
307 fp = fopen(identity_file, "r");
308 if (fp == NULL) {
309 perror(identity_file);
310 exit(1);
311 }
312 encoded[0] = '\0';
313 while (fgets(line, sizeof(line), fp)) {
314 if (!(p = strchr(line, '\n'))) {
315 fprintf(stderr, "input line too long.\n");
316 exit(1);
317 }
318 if (p > line && p[-1] == '\\')
319 escaped++;
320 if (strncmp(line, "----", 4) == 0 ||
321 strstr(line, ": ") != NULL) {
322 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
323 private = 1;
324 if (strstr(line, " END ") != NULL) {
325 break;
326 }
327 /* fprintf(stderr, "ignore: %s", line); */
328 continue;
329 }
330 if (escaped) {
331 escaped--;
332 /* fprintf(stderr, "escaped: %s", line); */
333 continue;
334 }
335 *p = '\0';
336 strlcat(encoded, line, sizeof(encoded));
337 }
700318f3 338 len = strlen(encoded);
339 if (((len % 4) == 3) &&
340 (encoded[len-1] == '=') &&
341 (encoded[len-2] == '=') &&
342 (encoded[len-3] == '='))
343 encoded[len-3] = '\0';
e9a17296 344 blen = uudecode(encoded, blob, sizeof(blob));
3c0ef626 345 if (blen < 0) {
346 fprintf(stderr, "uudecode failed.\n");
347 exit(1);
348 }
349 k = private ?
350 do_convert_private_ssh2_from_blob(blob, blen) :
351 key_from_blob(blob, blen);
352 if (k == NULL) {
353 fprintf(stderr, "decode blob failed.\n");
354 exit(1);
355 }
356 ok = private ?
357 (k->type == KEY_DSA ?
358 PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) :
359 PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) :
360 key_write(k, stdout);
361 if (!ok) {
362 fprintf(stderr, "key write failed");
363 exit(1);
364 }
365 key_free(k);
e9a17296 366 if (!private)
367 fprintf(stdout, "\n");
3c0ef626 368 fclose(fp);
369 exit(0);
370}
371
372static void
373do_print_public(struct passwd *pw)
374{
375 Key *prv;
376 struct stat st;
377
378 if (!have_identity)
379 ask_filename(pw, "Enter file in which the key is");
380 if (stat(identity_file, &st) < 0) {
381 perror(identity_file);
382 exit(1);
383 }
384 prv = load_identity(identity_file);
385 if (prv == NULL) {
386 fprintf(stderr, "load failed\n");
387 exit(1);
388 }
389 if (!key_write(prv, stdout))
390 fprintf(stderr, "key_write failed");
391 key_free(prv);
392 fprintf(stdout, "\n");
393 exit(0);
394}
395
396#ifdef SMARTCARD
3c0ef626 397static void
398do_upload(struct passwd *pw, const char *sc_reader_id)
399{
400 Key *prv = NULL;
401 struct stat st;
700318f3 402 int ret;
403
3c0ef626 404 if (!have_identity)
405 ask_filename(pw, "Enter file in which the key is");
406 if (stat(identity_file, &st) < 0) {
407 perror(identity_file);
700318f3 408 exit(1);
3c0ef626 409 }
410 prv = load_identity(identity_file);
411 if (prv == NULL) {
412 error("load failed");
700318f3 413 exit(1);
3c0ef626 414 }
700318f3 415 ret = sc_put_key(prv, sc_reader_id);
416 key_free(prv);
417 if (ret < 0)
418 exit(1);
f5799ae1 419 log("loading key done");
700318f3 420 exit(0);
3c0ef626 421}
422
423static void
424do_download(struct passwd *pw, const char *sc_reader_id)
425{
700318f3 426 Key **keys = NULL;
427 int i;
3c0ef626 428
700318f3 429 keys = sc_get_keys(sc_reader_id, NULL);
430 if (keys == NULL)
3c0ef626 431 fatal("cannot read public key from smartcard");
700318f3 432 for (i = 0; keys[i]; i++) {
433 key_write(keys[i], stdout);
434 key_free(keys[i]);
435 fprintf(stdout, "\n");
436 }
437 xfree(keys);
3c0ef626 438 exit(0);
439}
440#endif /* SMARTCARD */
441
442static void
443do_fingerprint(struct passwd *pw)
444{
445 FILE *f;
446 Key *public;
447 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
e9a17296 448 int i, skip = 0, num = 1, invalid = 1;
449 enum fp_rep rep;
450 enum fp_type fptype;
3c0ef626 451 struct stat st;
452
453 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
454 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
455
456 if (!have_identity)
457 ask_filename(pw, "Enter file in which the key is");
458 if (stat(identity_file, &st) < 0) {
459 perror(identity_file);
460 exit(1);
461 }
462 public = key_load_public(identity_file, &comment);
463 if (public != NULL) {
464 fp = key_fingerprint(public, fptype, rep);
680cee3b 465 printf("%u %s %s\n", key_size(public), fp, comment);
3c0ef626 466 key_free(public);
467 xfree(comment);
468 xfree(fp);
469 exit(0);
470 }
471 if (comment)
472 xfree(comment);
473
474 f = fopen(identity_file, "r");
475 if (f != NULL) {
476 while (fgets(line, sizeof(line), f)) {
477 i = strlen(line) - 1;
478 if (line[i] != '\n') {
479 error("line %d too long: %.40s...", num, line);
480 skip = 1;
481 continue;
482 }
483 num++;
484 if (skip) {
485 skip = 0;
486 continue;
487 }
488 line[i] = '\0';
489
490 /* Skip leading whitespace, empty and comment lines. */
491 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
492 ;
493 if (!*cp || *cp == '\n' || *cp == '#')
494 continue ;
495 i = strtol(cp, &ep, 10);
496 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
497 int quoted = 0;
498 comment = cp;
680cee3b 499 for (; *cp && (quoted || (*cp != ' ' &&
500 *cp != '\t')); cp++) {
3c0ef626 501 if (*cp == '\\' && cp[1] == '"')
502 cp++; /* Skip both */
503 else if (*cp == '"')
504 quoted = !quoted;
505 }
506 if (!*cp)
507 continue;
508 *cp++ = '\0';
509 }
510 ep = cp;
511 public = key_new(KEY_RSA1);
512 if (key_read(public, &cp) != 1) {
513 cp = ep;
514 key_free(public);
515 public = key_new(KEY_UNSPEC);
516 if (key_read(public, &cp) != 1) {
517 key_free(public);
518 continue;
519 }
520 }
521 comment = *cp ? cp : comment;
522 fp = key_fingerprint(public, fptype, rep);
680cee3b 523 printf("%u %s %s\n", key_size(public), fp,
3c0ef626 524 comment ? comment : "no comment");
525 xfree(fp);
526 key_free(public);
527 invalid = 0;
528 }
529 fclose(f);
530 }
531 if (invalid) {
532 printf("%s is not a public key file.\n", identity_file);
533 exit(1);
534 }
535 exit(0);
536}
537
538/*
539 * Perform changing a passphrase. The argument is the passwd structure
540 * for the current user.
541 */
542static void
543do_change_passphrase(struct passwd *pw)
544{
545 char *comment;
546 char *old_passphrase, *passphrase1, *passphrase2;
547 struct stat st;
548 Key *private;
549
550 if (!have_identity)
551 ask_filename(pw, "Enter file in which the key is");
552 if (stat(identity_file, &st) < 0) {
553 perror(identity_file);
554 exit(1);
555 }
556 /* Try to load the file with empty passphrase. */
557 private = key_load_private(identity_file, "", &comment);
558 if (private == NULL) {
559 if (identity_passphrase)
560 old_passphrase = xstrdup(identity_passphrase);
561 else
562 old_passphrase =
563 read_passphrase("Enter old passphrase: ",
564 RP_ALLOW_STDIN);
565 private = key_load_private(identity_file, old_passphrase,
566 &comment);
567 memset(old_passphrase, 0, strlen(old_passphrase));
568 xfree(old_passphrase);
569 if (private == NULL) {
570 printf("Bad passphrase.\n");
571 exit(1);
572 }
573 }
574 printf("Key has comment '%s'\n", comment);
575
576 /* Ask the new passphrase (twice). */
577 if (identity_new_passphrase) {
578 passphrase1 = xstrdup(identity_new_passphrase);
579 passphrase2 = NULL;
580 } else {
581 passphrase1 =
582 read_passphrase("Enter new passphrase (empty for no "
583 "passphrase): ", RP_ALLOW_STDIN);
584 passphrase2 = read_passphrase("Enter same passphrase again: ",
e9a17296 585 RP_ALLOW_STDIN);
3c0ef626 586
587 /* Verify that they are the same. */
588 if (strcmp(passphrase1, passphrase2) != 0) {
589 memset(passphrase1, 0, strlen(passphrase1));
590 memset(passphrase2, 0, strlen(passphrase2));
591 xfree(passphrase1);
592 xfree(passphrase2);
593 printf("Pass phrases do not match. Try again.\n");
594 exit(1);
595 }
596 /* Destroy the other copy. */
597 memset(passphrase2, 0, strlen(passphrase2));
598 xfree(passphrase2);
599 }
600
601 /* Save the file using the new passphrase. */
602 if (!key_save_private(private, identity_file, passphrase1, comment)) {
603 printf("Saving the key failed: %s.\n", identity_file);
604 memset(passphrase1, 0, strlen(passphrase1));
605 xfree(passphrase1);
606 key_free(private);
607 xfree(comment);
608 exit(1);
609 }
610 /* Destroy the passphrase and the copy of the key in memory. */
611 memset(passphrase1, 0, strlen(passphrase1));
612 xfree(passphrase1);
613 key_free(private); /* Destroys contents */
614 xfree(comment);
615
616 printf("Your identification has been saved with the new passphrase.\n");
617 exit(0);
618}
619
620/*
621 * Change the comment of a private key file.
622 */
623static void
624do_change_comment(struct passwd *pw)
625{
626 char new_comment[1024], *comment, *passphrase;
627 Key *private;
628 Key *public;
629 struct stat st;
630 FILE *f;
631 int fd;
632
633 if (!have_identity)
634 ask_filename(pw, "Enter file in which the key is");
635 if (stat(identity_file, &st) < 0) {
636 perror(identity_file);
637 exit(1);
638 }
639 private = key_load_private(identity_file, "", &comment);
640 if (private == NULL) {
641 if (identity_passphrase)
642 passphrase = xstrdup(identity_passphrase);
643 else if (identity_new_passphrase)
644 passphrase = xstrdup(identity_new_passphrase);
645 else
646 passphrase = read_passphrase("Enter passphrase: ",
647 RP_ALLOW_STDIN);
648 /* Try to load using the passphrase. */
649 private = key_load_private(identity_file, passphrase, &comment);
650 if (private == NULL) {
651 memset(passphrase, 0, strlen(passphrase));
652 xfree(passphrase);
653 printf("Bad passphrase.\n");
654 exit(1);
655 }
656 } else {
657 passphrase = xstrdup("");
658 }
659 if (private->type != KEY_RSA1) {
660 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
661 key_free(private);
662 exit(1);
e9a17296 663 }
3c0ef626 664 printf("Key now has comment '%s'\n", comment);
665
666 if (identity_comment) {
667 strlcpy(new_comment, identity_comment, sizeof(new_comment));
668 } else {
669 printf("Enter new comment: ");
670 fflush(stdout);
671 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
672 memset(passphrase, 0, strlen(passphrase));
673 key_free(private);
674 exit(1);
675 }
676 if (strchr(new_comment, '\n'))
677 *strchr(new_comment, '\n') = 0;
678 }
679
680 /* Save the file using the new passphrase. */
681 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
682 printf("Saving the key failed: %s.\n", identity_file);
683 memset(passphrase, 0, strlen(passphrase));
684 xfree(passphrase);
685 key_free(private);
686 xfree(comment);
687 exit(1);
688 }
689 memset(passphrase, 0, strlen(passphrase));
690 xfree(passphrase);
691 public = key_from_private(private);
692 key_free(private);
693
694 strlcat(identity_file, ".pub", sizeof(identity_file));
695 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
696 if (fd == -1) {
697 printf("Could not save your public key in %s\n", identity_file);
698 exit(1);
699 }
700 f = fdopen(fd, "w");
701 if (f == NULL) {
702 printf("fdopen %s failed", identity_file);
703 exit(1);
704 }
705 if (!key_write(public, f))
706 fprintf(stderr, "write key failed");
707 key_free(public);
708 fprintf(f, " %s\n", new_comment);
709 fclose(f);
710
711 xfree(comment);
712
713 printf("The comment in your key file has been changed.\n");
714 exit(0);
715}
716
717static void
718usage(void)
719{
720 fprintf(stderr, "Usage: %s [options]\n", __progname);
721 fprintf(stderr, "Options:\n");
722 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
723 fprintf(stderr, " -c Change comment in private and public key files.\n");
724 fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n");
725 fprintf(stderr, " -f filename Filename of the key file.\n");
726 fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n");
727 fprintf(stderr, " -l Show fingerprint of key file.\n");
728 fprintf(stderr, " -p Change passphrase of private key file.\n");
729 fprintf(stderr, " -q Quiet.\n");
730 fprintf(stderr, " -y Read private key file and print public key.\n");
731 fprintf(stderr, " -t type Specify type of key to create.\n");
732 fprintf(stderr, " -B Show bubblebabble digest of key file.\n");
733 fprintf(stderr, " -C comment Provide new comment.\n");
734 fprintf(stderr, " -N phrase Provide new passphrase.\n");
735 fprintf(stderr, " -P phrase Provide old passphrase.\n");
736#ifdef SMARTCARD
737 fprintf(stderr, " -D reader Download public key from smartcard.\n");
738 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
739#endif /* SMARTCARD */
740
741 exit(1);
742}
743
744/*
745 * Main program for key management.
746 */
747int
748main(int ac, char **av)
749{
e9a17296 750 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
3c0ef626 751 char *reader_id = NULL;
752 Key *private, *public;
753 struct passwd *pw;
754 struct stat st;
755 int opt, type, fd, download = 0;
756 FILE *f;
757
758 extern int optind;
759 extern char *optarg;
760
761 __progname = get_progname(av[0]);
3c0ef626 762
763 SSLeay_add_all_algorithms();
764
765 /* we need this for the home * directory. */
766 pw = getpwuid(getuid());
767 if (!pw) {
768 printf("You don't exist, go away!\n");
769 exit(1);
770 }
771 if (gethostname(hostname, sizeof(hostname)) < 0) {
772 perror("gethostname");
773 exit(1);
774 }
775
776 while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) {
777 switch (opt) {
778 case 'b':
779 bits = atoi(optarg);
780 if (bits < 512 || bits > 32768) {
781 printf("Bits has bad value.\n");
782 exit(1);
783 }
784 break;
785 case 'l':
786 print_fingerprint = 1;
787 break;
788 case 'B':
789 print_bubblebabble = 1;
790 break;
791 case 'p':
792 change_passphrase = 1;
793 break;
794 case 'c':
795 change_comment = 1;
796 break;
797 case 'f':
798 strlcpy(identity_file, optarg, sizeof(identity_file));
799 have_identity = 1;
800 break;
801 case 'P':
802 identity_passphrase = optarg;
803 break;
804 case 'N':
805 identity_new_passphrase = optarg;
806 break;
807 case 'C':
808 identity_comment = optarg;
809 break;
810 case 'q':
811 quiet = 1;
812 break;
813 case 'R':
814 /* unused */
815 exit(0);
816 break;
817 case 'e':
818 case 'x':
819 /* export key */
820 convert_to_ssh2 = 1;
821 break;
822 case 'i':
823 case 'X':
824 /* import key */
825 convert_from_ssh2 = 1;
826 break;
827 case 'y':
828 print_public = 1;
829 break;
830 case 'd':
831 key_type_name = "dsa";
832 break;
833 case 't':
834 key_type_name = optarg;
835 break;
836 case 'D':
837 download = 1;
838 case 'U':
839 reader_id = optarg;
840 break;
841 case '?':
842 default:
843 usage();
844 }
845 }
846 if (optind < ac) {
847 printf("Too many arguments.\n");
848 usage();
849 }
850 if (change_passphrase && change_comment) {
851 printf("Can only have one of -p and -c.\n");
852 usage();
853 }
854 if (print_fingerprint || print_bubblebabble)
855 do_fingerprint(pw);
856 if (change_passphrase)
857 do_change_passphrase(pw);
3c0ef626 858 if (convert_to_ssh2)
859 do_convert_to_ssh2(pw);
700318f3 860 if (change_comment)
861 do_change_comment(pw);
3c0ef626 862 if (print_public)
863 do_print_public(pw);
864 if (reader_id != NULL) {
865#ifdef SMARTCARD
866 if (download)
867 do_download(pw, reader_id);
868 else
869 do_upload(pw, reader_id);
870#else /* SMARTCARD */
871 fatal("no support for smartcards.");
872#endif /* SMARTCARD */
873 }
874
e9a17296 875 init_rng();
876 seed_rng();
3c0ef626 877 arc4random_stir();
878
700318f3 879 if (convert_from_ssh2)
880 do_convert_from_ssh2(pw);
881
e9a17296 882 if (key_type_name == NULL) {
883 printf("You must specify a key type (-t).\n");
884 usage();
885 }
3c0ef626 886 type = key_type_from_name(key_type_name);
887 if (type == KEY_UNSPEC) {
888 fprintf(stderr, "unknown key type %s\n", key_type_name);
889 exit(1);
890 }
891 if (!quiet)
892 printf("Generating public/private %s key pair.\n", key_type_name);
893 private = key_generate(type, bits);
894 if (private == NULL) {
895 fprintf(stderr, "key_generate failed");
896 exit(1);
897 }
898 public = key_from_private(private);
899
900 if (!have_identity)
901 ask_filename(pw, "Enter file in which to save the key");
902
903 /* Create ~/.ssh directory if it doesn\'t already exist. */
904 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
905 if (strstr(identity_file, dotsshdir) != NULL &&
906 stat(dotsshdir, &st) < 0) {
907 if (mkdir(dotsshdir, 0700) < 0)
908 error("Could not create directory '%s'.", dotsshdir);
909 else if (!quiet)
910 printf("Created directory '%s'.\n", dotsshdir);
911 }
912 /* If the file already exists, ask the user to confirm. */
913 if (stat(identity_file, &st) >= 0) {
914 char yesno[3];
915 printf("%s already exists.\n", identity_file);
916 printf("Overwrite (y/n)? ");
917 fflush(stdout);
918 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
919 exit(1);
920 if (yesno[0] != 'y' && yesno[0] != 'Y')
921 exit(1);
922 }
923 /* Ask for a passphrase (twice). */
924 if (identity_passphrase)
925 passphrase1 = xstrdup(identity_passphrase);
926 else if (identity_new_passphrase)
927 passphrase1 = xstrdup(identity_new_passphrase);
928 else {
929passphrase_again:
930 passphrase1 =
931 read_passphrase("Enter passphrase (empty for no "
932 "passphrase): ", RP_ALLOW_STDIN);
933 passphrase2 = read_passphrase("Enter same passphrase again: ",
934 RP_ALLOW_STDIN);
935 if (strcmp(passphrase1, passphrase2) != 0) {
936 /*
937 * The passphrases do not match. Clear them and
938 * retry.
939 */
940 memset(passphrase1, 0, strlen(passphrase1));
941 memset(passphrase2, 0, strlen(passphrase2));
942 xfree(passphrase1);
943 xfree(passphrase2);
944 printf("Passphrases do not match. Try again.\n");
945 goto passphrase_again;
946 }
947 /* Clear the other copy of the passphrase. */
948 memset(passphrase2, 0, strlen(passphrase2));
949 xfree(passphrase2);
950 }
951
952 if (identity_comment) {
953 strlcpy(comment, identity_comment, sizeof(comment));
954 } else {
955 /* Create default commend field for the passphrase. */
956 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
957 }
958
959 /* Save the key with the given passphrase and comment. */
960 if (!key_save_private(private, identity_file, passphrase1, comment)) {
961 printf("Saving the key failed: %s.\n", identity_file);
962 memset(passphrase1, 0, strlen(passphrase1));
963 xfree(passphrase1);
964 exit(1);
965 }
966 /* Clear the passphrase. */
967 memset(passphrase1, 0, strlen(passphrase1));
968 xfree(passphrase1);
969
970 /* Clear the private key and the random number generator. */
971 key_free(private);
972 arc4random_stir();
973
974 if (!quiet)
975 printf("Your identification has been saved in %s.\n", identity_file);
976
977 strlcat(identity_file, ".pub", sizeof(identity_file));
978 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
979 if (fd == -1) {
980 printf("Could not save your public key in %s\n", identity_file);
981 exit(1);
982 }
983 f = fdopen(fd, "w");
984 if (f == NULL) {
985 printf("fdopen %s failed", identity_file);
986 exit(1);
987 }
988 if (!key_write(public, f))
989 fprintf(stderr, "write key failed");
990 fprintf(f, " %s\n", comment);
991 fclose(f);
992
993 if (!quiet) {
994 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
995 printf("Your public key has been saved in %s.\n",
996 identity_file);
997 printf("The key fingerprint is:\n");
998 printf("%s %s\n", fp, comment);
999 xfree(fp);
1000 }
1001
1002 key_free(public);
1003 exit(0);
1004}
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