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f8f89bae 1/* $OpenBSD: ssh-keygen.c,v 1.165 2008/01/19 22:37:19 djm Exp $ */
8efc0c15 2/*
5260325f 3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
5260325f 6 * Identity and host key generation and maintenance.
bcbf86ec 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".
5260325f 13 */
8efc0c15 14
15#include "includes.h"
4095f623 16
17#include <sys/types.h>
5b04a8bf 18#include <sys/socket.h>
4095f623 19#include <sys/stat.h>
536c14e8 20#include <sys/param.h>
8efc0c15 21
a306f2dd 22#include <openssl/evp.h>
23#include <openssl/pem.h>
f5f25d17 24#include "openbsd-compat/openssl-compat.h"
a306f2dd 25
028094f4 26#include <errno.h>
d3221cca 27#include <fcntl.h>
28cb0a43 28#include <netdb.h>
42685763 29#ifdef HAVE_PATHS_H
30# include <paths.h>
31#endif
b1842393 32#include <pwd.h>
24436b92 33#include <stdarg.h>
cf851879 34#include <stdio.h>
ffa517a8 35#include <stdlib.h>
00146caa 36#include <string.h>
5188ba17 37#include <unistd.h>
b1842393 38
8efc0c15 39#include "xmalloc.h"
a306f2dd 40#include "key.h"
457fc0c6 41#include "rsa.h"
a306f2dd 42#include "authfile.h"
43#include "uuencode.h"
94ec8c6b 44#include "buffer.h"
42f11eb2 45#include "pathnames.h"
46#include "log.h"
58ae9cb8 47#include "misc.h"
bdffbcdc 48#include "match.h"
49#include "hostfile.h"
0cbe25f0 50#include "dns.h"
94ec8c6b 51
93a56445 52#ifdef SMARTCARD
93a56445 53#include "scard.h"
dd2495cb 54#endif
2b30154a 55
255d3e00 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
59u_int32_t bits = 0;
8efc0c15 60
aa3378df 61/*
62 * Flag indicating that we just want to change the passphrase. This can be
63 * set on the command line.
64 */
8efc0c15 65int change_passphrase = 0;
66
aa3378df 67/*
68 * Flag indicating that we just want to change the comment. This can be set
69 * on the command line.
70 */
8efc0c15 71int change_comment = 0;
72
73int quiet = 0;
74
bdffbcdc 75/* Flag indicating that we want to hash a known_hosts file */
76int hash_hosts = 0;
77/* Flag indicating that we want lookup a host in known_hosts file */
78int find_host = 0;
79/* Flag indicating that we want to delete a host from a known_hosts file */
80int delete_host = 0;
81
f095fcc7 82/* Flag indicating that we just want to see the key fingerprint */
83int print_fingerprint = 0;
aaf45d87 84int print_bubblebabble = 0;
f095fcc7 85
5ad13cd7 86/* The identity file name, given on the command line or entered by the user. */
87char identity_file[1024];
88int have_identity = 0;
8efc0c15 89
90/* This is set to the passphrase if given on the command line. */
91char *identity_passphrase = NULL;
92
93/* This is set to the new passphrase if given on the command line. */
94char *identity_new_passphrase = NULL;
95
96/* This is set to the new comment if given on the command line. */
97char *identity_comment = NULL;
98
a306f2dd 99/* Dump public key file in format used by real and the original SSH 2 */
100int convert_to_ssh2 = 0;
101int convert_from_ssh2 = 0;
102int print_public = 0;
21289cd0 103int print_generic = 0;
fa08c86b 104
3dc93cd8 105char *key_type_name = NULL;
a306f2dd 106
5ad13cd7 107/* argv0 */
108extern char *__progname;
8efc0c15 109
a306f2dd 110char hostname[MAXHOSTNAMELEN];
111
20eea1d7 112/* moduli.c */
c784ae09 113int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
20eea1d7 114int prime_test(FILE *, FILE *, u_int32_t, u_int32_t);
115
396c147e 116static void
5ad13cd7 117ask_filename(struct passwd *pw, const char *prompt)
8efc0c15 118{
5260325f 119 char buf[1024];
c523303b 120 char *name = NULL;
121
8d22d775 122 if (key_type_name == NULL)
42f11eb2 123 name = _PATH_SSH_CLIENT_ID_RSA;
32596c7b 124 else {
8d22d775 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 }
32596c7b 140 }
c523303b 141 snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name);
8d88011e 142 fprintf(stderr, "%s (%s): ", prompt, identity_file);
5260325f 143 if (fgets(buf, sizeof(buf), stdin) == NULL)
144 exit(1);
b05117ac 145 buf[strcspn(buf, "\n")] = '\0';
5260325f 146 if (strcmp(buf, "") != 0)
147 strlcpy(identity_file, buf, sizeof(identity_file));
148 have_identity = 1;
f095fcc7 149}
8efc0c15 150
396c147e 151static Key *
abe0fb9f 152load_identity(char *filename)
a306f2dd 153{
aeaa3d9e 154 char *pass;
155 Key *prv;
156
cd332296 157 prv = key_load_private(filename, "", NULL);
aeaa3d9e 158 if (prv == NULL) {
abe0fb9f 159 if (identity_passphrase)
160 pass = xstrdup(identity_passphrase);
161 else
1843a425 162 pass = read_passphrase("Enter passphrase: ",
163 RP_ALLOW_STDIN);
aeaa3d9e 164 prv = key_load_private(filename, pass, NULL);
a306f2dd 165 memset(pass, 0, strlen(pass));
166 xfree(pass);
167 }
aeaa3d9e 168 return prv;
a306f2dd 169}
170
94ec8c6b 171#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
7203d6bb 172#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
94ec8c6b 173#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
2b87da3b 174#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
a306f2dd 175
396c147e 176static void
a306f2dd 177do_convert_to_ssh2(struct passwd *pw)
178{
b587c165 179 Key *k;
21b30f38 180 u_int len;
1e3b8b07 181 u_char *blob;
a306f2dd 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 }
b587c165 190 if ((k = key_load_public(identity_file, NULL)) == NULL) {
abe0fb9f 191 if ((k = load_identity(identity_file)) == NULL) {
b587c165 192 fprintf(stderr, "load failed\n");
193 exit(1);
194 }
a306f2dd 195 }
3566c73c 196 if (k->type == KEY_RSA1) {
197 fprintf(stderr, "version 1 keys are not supported\n");
198 exit(1);
199 }
f7436b8c 200 if (key_to_blob(k, &blob, &len) <= 0) {
201 fprintf(stderr, "key_to_blob failed\n");
202 exit(1);
203 }
94ec8c6b 204 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
a306f2dd 205 fprintf(stdout,
512df038 206 "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n",
b587c165 207 key_size(k), key_type(k),
a306f2dd 208 pw->pw_name, hostname);
209 dump_base64(stdout, blob, len);
94ec8c6b 210 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
b587c165 211 key_free(k);
a306f2dd 212 xfree(blob);
213 exit(0);
214}
215
396c147e 216static void
94ec8c6b 217buffer_get_bignum_bits(Buffer *b, BIGNUM *value)
218{
ca75d7de 219 u_int bignum_bits = buffer_get_int(b);
220 u_int bytes = (bignum_bits + 7) / 8;
457fc0c6 221
94ec8c6b 222 if (buffer_len(b) < bytes)
457fc0c6 223 fatal("buffer_get_bignum_bits: input buffer too small: "
224 "need %d have %d", bytes, buffer_len(b));
e516451d 225 if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL)
226 fatal("buffer_get_bignum_bits: BN_bin2bn failed");
94ec8c6b 227 buffer_consume(b, bytes);
228}
229
396c147e 230static Key *
c66f9d0e 231do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
94ec8c6b 232{
233 Buffer b;
94ec8c6b 234 Key *key = NULL;
a599bd06 235 char *type, *cipher;
d3260e12 236 u_char *sig, data[] = "abcde12345";
2e0becb6 237 int magic, rlen, ktype, i1, i2, i3, i4;
a599bd06 238 u_int slen;
2e0becb6 239 u_long e;
94ec8c6b 240
241 buffer_init(&b);
242 buffer_append(&b, blob, blen);
243
803c4226 244 magic = buffer_get_int(&b);
94ec8c6b 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 }
2e0becb6 250 i1 = buffer_get_int(&b);
94ec8c6b 251 type = buffer_get_string(&b, NULL);
252 cipher = buffer_get_string(&b, NULL);
2e0becb6 253 i2 = buffer_get_int(&b);
254 i3 = buffer_get_int(&b);
255 i4 = buffer_get_int(&b);
4f6e2ba9 256 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
94ec8c6b 257 if (strcmp(cipher, "none") != 0) {
258 error("unsupported cipher %s", cipher);
259 xfree(cipher);
260 buffer_free(&b);
457fc0c6 261 xfree(type);
94ec8c6b 262 return NULL;
263 }
264 xfree(cipher);
265
457fc0c6 266 if (strstr(type, "dsa")) {
267 ktype = KEY_DSA;
268 } else if (strstr(type, "rsa")) {
269 ktype = KEY_RSA;
270 } else {
3c460ede 271 buffer_free(&b);
457fc0c6 272 xfree(type);
94ec8c6b 273 return NULL;
274 }
457fc0c6 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:
803c4226 287 e = buffer_get_char(&b);
2e0becb6 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)) {
457fc0c6 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);
2b63e803 307 rsa_generate_additional_parameters(key->rsa);
457fc0c6 308 break;
309 }
94ec8c6b 310 rlen = buffer_len(&b);
6aacefa7 311 if (rlen != 0)
457fc0c6 312 error("do_convert_private_ssh2_from_blob: "
313 "remaining bytes in key blob %d", rlen);
94ec8c6b 314 buffer_free(&b);
a599bd06 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);
94ec8c6b 320 return key;
321}
322
15b81af3 323static int
324get_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 }
32596c7b 335 switch (c) {
15b81af3 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 }
cbaa43c0 349 /* We reached EOF */
350 return -1;
15b81af3 351}
352
396c147e 353static void
a306f2dd 354do_convert_from_ssh2(struct passwd *pw)
355{
356 Key *k;
357 int blen;
783dbbdc 358 u_int len;
15b81af3 359 char line[1024];
cf54363d 360 u_char blob[8096];
a306f2dd 361 char encoded[8096];
362 struct stat st;
94ec8c6b 363 int escaped = 0, private = 0, ok;
a306f2dd 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';
15b81af3 378 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
379 if (line[blen - 1] == '\\')
d0c832f3 380 escaped++;
a306f2dd 381 if (strncmp(line, "----", 4) == 0 ||
382 strstr(line, ": ") != NULL) {
94ec8c6b 383 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
384 private = 1;
a599bd06 385 if (strstr(line, " END ") != NULL) {
386 break;
387 }
012bc0e1 388 /* fprintf(stderr, "ignore: %s", line); */
a306f2dd 389 continue;
390 }
d0c832f3 391 if (escaped) {
392 escaped--;
012bc0e1 393 /* fprintf(stderr, "escaped: %s", line); */
d0c832f3 394 continue;
a306f2dd 395 }
a306f2dd 396 strlcat(encoded, line, sizeof(encoded));
397 }
783dbbdc 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';
e6207598 404 blen = uudecode(encoded, blob, sizeof(blob));
a306f2dd 405 if (blen < 0) {
406 fprintf(stderr, "uudecode failed.\n");
407 exit(1);
408 }
94ec8c6b 409 k = private ?
410 do_convert_private_ssh2_from_blob(blob, blen) :
fa08c86b 411 key_from_blob(blob, blen);
94ec8c6b 412 if (k == NULL) {
413 fprintf(stderr, "decode blob failed.\n");
414 exit(1);
415 }
416 ok = private ?
457fc0c6 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)) :
94ec8c6b 420 key_write(k, stdout);
421 if (!ok) {
422 fprintf(stderr, "key write failed");
423 exit(1);
424 }
a306f2dd 425 key_free(k);
4ccb828d 426 if (!private)
427 fprintf(stdout, "\n");
a306f2dd 428 fclose(fp);
429 exit(0);
430}
431
396c147e 432static void
a306f2dd 433do_print_public(struct passwd *pw)
434{
aeaa3d9e 435 Key *prv;
a306f2dd 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 }
abe0fb9f 444 prv = load_identity(identity_file);
aeaa3d9e 445 if (prv == NULL) {
a306f2dd 446 fprintf(stderr, "load failed\n");
447 exit(1);
448 }
aeaa3d9e 449 if (!key_write(prv, stdout))
a306f2dd 450 fprintf(stderr, "key_write failed");
aeaa3d9e 451 key_free(prv);
a306f2dd 452 fprintf(stdout, "\n");
453 exit(0);
454}
455
4f831fd7 456#ifdef SMARTCARD
2b30154a 457static void
93a56445 458do_upload(struct passwd *pw, const char *sc_reader_id)
2b30154a 459{
2b30154a 460 Key *prv = NULL;
461 struct stat st;
b9f62352 462 int ret;
463
2b30154a 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);
b9f62352 468 exit(1);
2b30154a 469 }
470 prv = load_identity(identity_file);
471 if (prv == NULL) {
472 error("load failed");
b9f62352 473 exit(1);
49ccba9c 474 }
b9f62352 475 ret = sc_put_key(prv, sc_reader_id);
476 key_free(prv);
477 if (ret < 0)
478 exit(1);
bbe88b6d 479 logit("loading key done");
b9f62352 480 exit(0);
2b30154a 481}
93a56445 482
483static void
484do_download(struct passwd *pw, const char *sc_reader_id)
485{
0659cace 486 Key **keys = NULL;
487 int i;
93a56445 488
0659cace 489 keys = sc_get_keys(sc_reader_id, NULL);
490 if (keys == NULL)
93a56445 491 fatal("cannot read public key from smartcard");
0659cace 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);
93a56445 498 exit(0);
499}
3e984472 500#endif /* SMARTCARD */
2b30154a 501
396c147e 502static void
f095fcc7 503do_fingerprint(struct passwd *pw)
504{
c8d54615 505 FILE *f;
a306f2dd 506 Key *public;
aaf45d87 507 char *comment = NULL, *cp, *ep, line[16*1024], *fp;
f8f89bae 508 int i, skip = 0, num = 0, invalid = 1;
17a3011c 509 enum fp_rep rep;
510 enum fp_type fptype;
5260325f 511 struct stat st;
512
aeaa3d9e 513 fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5;
514 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX;
aaf45d87 515
5260325f 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 }
aeaa3d9e 522 public = key_load_public(identity_file, &comment);
523 if (public != NULL) {
524 fp = key_fingerprint(public, fptype, rep);
512df038 525 printf("%u %s %s\n", key_size(public), fp, comment);
a306f2dd 526 key_free(public);
fa08c86b 527 xfree(comment);
aaf45d87 528 xfree(fp);
c8d54615 529 exit(0);
530 }
2b8dc5e3 531 if (comment) {
aeaa3d9e 532 xfree(comment);
2b8dc5e3 533 comment = NULL;
534 }
c8d54615 535
536 f = fopen(identity_file, "r");
537 if (f != NULL) {
c8d54615 538 while (fgets(line, sizeof(line), f)) {
3e2d9453 539 if ((cp = strchr(line, '\n')) == NULL) {
f8f89bae 540 error("line %d too long: %.40s...",
541 num + 1, line);
c8d54615 542 skip = 1;
543 continue;
544 }
545 num++;
546 if (skip) {
547 skip = 0;
548 continue;
549 }
3e2d9453 550 *cp = '\0';
c8d54615 551
552 /* Skip leading whitespace, empty and comment lines. */
553 for (cp = line; *cp == ' ' || *cp == '\t'; cp++)
554 ;
555 if (!*cp || *cp == '\n' || *cp == '#')
4f6e2ba9 556 continue;
c8d54615 557 i = strtol(cp, &ep, 10);
558 if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) {
559 int quoted = 0;
560 comment = cp;
512df038 561 for (; *cp && (quoted || (*cp != ' ' &&
562 *cp != '\t')); cp++) {
c8d54615 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;
efcae5b1 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 }
5260325f 582 }
efcae5b1 583 comment = *cp ? cp : comment;
aeaa3d9e 584 fp = key_fingerprint(public, fptype, rep);
512df038 585 printf("%u %s %s\n", key_size(public), fp,
efcae5b1 586 comment ? comment : "no comment");
aaf45d87 587 xfree(fp);
aeaa3d9e 588 key_free(public);
efcae5b1 589 invalid = 0;
5260325f 590 }
c8d54615 591 fclose(f);
592 }
593 if (invalid) {
f564d016 594 printf("%s is not a public key file.\n", identity_file);
c8d54615 595 exit(1);
5260325f 596 }
5260325f 597 exit(0);
f095fcc7 598}
599
bdffbcdc 600static void
ccc6beea 601print_host(FILE *f, const char *name, Key *public, int hash)
bdffbcdc 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
611static void
612do_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];
f8f89bae 618 int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0;
bdffbcdc 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)) {
3e2d9453 653 if ((cp = strchr(line, '\n')) == NULL) {
f8f89bae 654 error("line %d too long: %.40s...", num + 1, line);
bdffbcdc 655 skip = 1;
656 invalid = 1;
657 continue;
658 }
3e2d9453 659 num++;
bdffbcdc 660 if (skip) {
661 skip = 0;
662 continue;
663 }
3e2d9453 664 *cp = '\0';
bdffbcdc 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));
ccc6beea 728 print_host(out, name, public,
729 hash_hosts);
bdffbcdc 730 }
731 if (delete_host && !c)
732 print_host(out, cp, public, 0);
733 } else if (hash_hosts) {
f8cc7664 734 for (cp2 = strsep(&cp, ",");
bdffbcdc 735 cp2 != NULL && *cp2 != '\0';
bc7119ba 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 }
bdffbcdc 745 has_unhashed = 1;
746 }
747 }
748 key_free(public);
749 }
750 fclose(in);
751
752 if (invalid) {
f8f89bae 753 fprintf(stderr, "%s is not a valid known_hosts file.\n",
bdffbcdc 754 identity_file);
755 if (inplace) {
756 fprintf(stderr, "Not replacing existing known_hosts "
604dac32 757 "file because of errors\n");
bdffbcdc 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 "
4e2e5cfd 788 "of hostnames\n");
bdffbcdc 789 }
790 }
791
792 exit(0);
793}
794
5260325f 795/*
796 * Perform changing a passphrase. The argument is the passwd structure
797 * for the current user.
798 */
396c147e 799static void
f095fcc7 800do_change_passphrase(struct passwd *pw)
801{
5260325f 802 char *comment;
803 char *old_passphrase, *passphrase1, *passphrase2;
804 struct stat st;
a306f2dd 805 Key *private;
5260325f 806
807 if (!have_identity)
808 ask_filename(pw, "Enter file in which the key is");
5260325f 809 if (stat(identity_file, &st) < 0) {
810 perror(identity_file);
811 exit(1);
812 }
5260325f 813 /* Try to load the file with empty passphrase. */
aeaa3d9e 814 private = key_load_private(identity_file, "", &comment);
815 if (private == NULL) {
5260325f 816 if (identity_passphrase)
817 old_passphrase = xstrdup(identity_passphrase);
818 else
1843a425 819 old_passphrase =
820 read_passphrase("Enter old passphrase: ",
821 RP_ALLOW_STDIN);
822 private = key_load_private(identity_file, old_passphrase,
823 &comment);
aeaa3d9e 824 memset(old_passphrase, 0, strlen(old_passphrase));
825 xfree(old_passphrase);
826 if (private == NULL) {
5260325f 827 printf("Bad passphrase.\n");
828 exit(1);
829 }
5260325f 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 =
1843a425 839 read_passphrase("Enter new passphrase (empty for no "
840 "passphrase): ", RP_ALLOW_STDIN);
841 passphrase2 = read_passphrase("Enter same passphrase again: ",
184eed6a 842 RP_ALLOW_STDIN);
5260325f 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);
8efc0c15 856 }
8efc0c15 857
5260325f 858 /* Save the file using the new passphrase. */
aeaa3d9e 859 if (!key_save_private(private, identity_file, passphrase1, comment)) {
58cfa257 860 printf("Saving the key failed: %s.\n", identity_file);
5260325f 861 memset(passphrase1, 0, strlen(passphrase1));
862 xfree(passphrase1);
a306f2dd 863 key_free(private);
5260325f 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);
a306f2dd 870 key_free(private); /* Destroys contents */
5260325f 871 xfree(comment);
872
873 printf("Your identification has been saved with the new passphrase.\n");
874 exit(0);
875}
8efc0c15 876
21289cd0 877/*
878 * Print the SSHFP RR.
879 */
3eff92ec 880static int
881do_print_resource_record(struct passwd *pw, char *fname, char *hname)
21289cd0 882{
883 Key *public;
884 char *comment = NULL;
885 struct stat st;
886
3eff92ec 887 if (fname == NULL)
21289cd0 888 ask_filename(pw, "Enter file in which the key is");
3eff92ec 889 if (stat(fname, &st) < 0) {
890 if (errno == ENOENT)
891 return 0;
892 perror(fname);
21289cd0 893 exit(1);
894 }
3eff92ec 895 public = key_load_public(fname, &comment);
21289cd0 896 if (public != NULL) {
ca75d7de 897 export_dns_rr(hname, public, stdout, print_generic);
21289cd0 898 key_free(public);
899 xfree(comment);
3eff92ec 900 return 1;
21289cd0 901 }
902 if (comment)
903 xfree(comment);
904
3eff92ec 905 printf("failed to read v2 public key from %s.\n", fname);
21289cd0 906 exit(1);
907}
21289cd0 908
5260325f 909/*
910 * Change the comment of a private key file.
911 */
396c147e 912static void
8efc0c15 913do_change_comment(struct passwd *pw)
914{
1c9a907f 915 char new_comment[1024], *comment, *passphrase;
aeaa3d9e 916 Key *private;
917 Key *public;
5260325f 918 struct stat st;
919 FILE *f;
1c9a907f 920 int fd;
5260325f 921
922 if (!have_identity)
923 ask_filename(pw, "Enter file in which the key is");
5260325f 924 if (stat(identity_file, &st) < 0) {
925 perror(identity_file);
926 exit(1);
927 }
aeaa3d9e 928 private = key_load_private(identity_file, "", &comment);
929 if (private == NULL) {
5260325f 930 if (identity_passphrase)
931 passphrase = xstrdup(identity_passphrase);
932 else if (identity_new_passphrase)
933 passphrase = xstrdup(identity_new_passphrase);
934 else
1843a425 935 passphrase = read_passphrase("Enter passphrase: ",
936 RP_ALLOW_STDIN);
5260325f 937 /* Try to load using the passphrase. */
aeaa3d9e 938 private = key_load_private(identity_file, passphrase, &comment);
939 if (private == NULL) {
5260325f 940 memset(passphrase, 0, strlen(passphrase));
941 xfree(passphrase);
942 printf("Bad passphrase.\n");
943 exit(1);
944 }
aeaa3d9e 945 } else {
946 passphrase = xstrdup("");
5260325f 947 }
aeaa3d9e 948 if (private->type != KEY_RSA1) {
949 fprintf(stderr, "Comments are only supported for RSA1 keys.\n");
950 key_free(private);
951 exit(1);
184eed6a 952 }
5260325f 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));
a306f2dd 962 key_free(private);
5260325f 963 exit(1);
964 }
b05117ac 965 new_comment[strcspn(new_comment, "\n")] = '\0';
5260325f 966 }
967
968 /* Save the file using the new passphrase. */
aeaa3d9e 969 if (!key_save_private(private, identity_file, passphrase, new_comment)) {
58cfa257 970 printf("Saving the key failed: %s.\n", identity_file);
5260325f 971 memset(passphrase, 0, strlen(passphrase));
972 xfree(passphrase);
a306f2dd 973 key_free(private);
5260325f 974 xfree(comment);
975 exit(1);
8efc0c15 976 }
5260325f 977 memset(passphrase, 0, strlen(passphrase));
978 xfree(passphrase);
aeaa3d9e 979 public = key_from_private(private);
a306f2dd 980 key_free(private);
5260325f 981
5260325f 982 strlcat(identity_file, ".pub", sizeof(identity_file));
1c9a907f 983 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
984 if (fd == -1) {
5260325f 985 printf("Could not save your public key in %s\n", identity_file);
986 exit(1);
987 }
1c9a907f 988 f = fdopen(fd, "w");
989 if (f == NULL) {
990 printf("fdopen %s failed", identity_file);
991 exit(1);
992 }
a306f2dd 993 if (!key_write(public, f))
994 fprintf(stderr, "write key failed");
995 key_free(public);
996 fprintf(f, " %s\n", new_comment);
5260325f 997 fclose(f);
998
999 xfree(comment);
1000
1001 printf("The comment in your key file has been changed.\n");
1002 exit(0);
8efc0c15 1003}
1004
396c147e 1005static void
5ad13cd7 1006usage(void)
1007{
269cfc8a 1008 fprintf(stderr, "usage: %s [options]\n", __progname);
58153e34 1009 fprintf(stderr, "Options:\n");
4feb61af 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");
58153e34 1012 fprintf(stderr, " -b bits Number of bits in the key to create.\n");
4feb61af 1013 fprintf(stderr, " -C comment Provide new comment.\n");
58153e34 1014 fprintf(stderr, " -c Change comment in private and public key files.\n");
4feb61af 1015#ifdef SMARTCARD
1016 fprintf(stderr, " -D reader Download public key from smartcard.\n");
1017#endif /* SMARTCARD */
e91a8c3f 1018 fprintf(stderr, " -e Convert OpenSSH to RFC 4716 key file.\n");
4feb61af 1019 fprintf(stderr, " -F hostname Find hostname in known hosts file.\n");
58153e34 1020 fprintf(stderr, " -f filename Filename of the key file.\n");
4feb61af 1021 fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n");
21289cd0 1022 fprintf(stderr, " -g Use generic DNS resource record format.\n");
4feb61af 1023 fprintf(stderr, " -H Hash names in known_hosts file.\n");
e91a8c3f 1024 fprintf(stderr, " -i Convert RFC 4716 to OpenSSH key file.\n");
58153e34 1025 fprintf(stderr, " -l Show fingerprint of key file.\n");
4feb61af 1026 fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n");
58153e34 1027 fprintf(stderr, " -N phrase Provide new passphrase.\n");
1028 fprintf(stderr, " -P phrase Provide old passphrase.\n");
4feb61af 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");
21289cd0 1032 fprintf(stderr, " -r hostname Print DNS resource record.\n");
4feb61af 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");
58153e34 1036#ifdef SMARTCARD
58153e34 1037 fprintf(stderr, " -U reader Upload private key to smartcard.\n");
1038#endif /* SMARTCARD */
4feb61af 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");
c35a6dc5 1042
5260325f 1043 exit(1);
5ad13cd7 1044}
1045
5260325f 1046/*
1047 * Main program for key management.
1048 */
8efc0c15 1049int
4b4810d4 1050main(int argc, char **argv)
8efc0c15 1051{
3dc93cd8 1052 char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2;
8f52069e 1053 char out_file[MAXPATHLEN], *reader_id = NULL;
bdffbcdc 1054 char *rr_hostname = NULL;
1c9a907f 1055 Key *private, *public;
5260325f 1056 struct passwd *pw;
5260325f 1057 struct stat st;
c784ae09 1058 int opt, type, fd, download = 0;
2a1995a3 1059 u_int32_t memory = 0, generator_wanted = 0, trials = 100;
c35a6dc5 1060 int do_gen_candidates = 0, do_screen_candidates = 0;
c6fbc95a 1061 int log_level = SYSLOG_LEVEL_INFO;
c35a6dc5 1062 BIGNUM *start = NULL;
5260325f 1063 FILE *f;
de4feb6b 1064 const char *errstr;
fa08c86b 1065
5260325f 1066 extern int optind;
1067 extern char *optarg;
1068
fd6168c1 1069 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1070 sanitise_stdfd();
1071
b05ff3f5 1072 __progname = ssh_get_progname(argv[0]);
264dce47 1073
fa649821 1074 SSLeay_add_all_algorithms();
4b4810d4 1075 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
c35a6dc5 1076
ce88d9df 1077 init_rng();
1078 seed_rng();
a306f2dd 1079
aa3378df 1080 /* we need this for the home * directory. */
5260325f 1081 pw = getpwuid(getuid());
1082 if (!pw) {
1083 printf("You don't exist, go away!\n");
1084 exit(1);
1085 }
a306f2dd 1086 if (gethostname(hostname, sizeof(hostname)) < 0) {
1087 perror("gethostname");
1088 exit(1);
1089 }
aa3378df 1090
4b4810d4 1091 while ((opt = getopt(argc, argv,
bdffbcdc 1092 "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) {
5260325f 1093 switch (opt) {
1094 case 'b':
0fe9892f 1095 bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr);
de4feb6b 1096 if (errstr)
1097 fatal("Bits has bad value %s (%s)",
1098 optarg, errstr);
5260325f 1099 break;
bdffbcdc 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;
5260325f 1111 case 'l':
1112 print_fingerprint = 1;
1113 break;
aaf45d87 1114 case 'B':
1115 print_bubblebabble = 1;
1116 break;
5260325f 1117 case 'p':
1118 change_passphrase = 1;
1119 break;
5260325f 1120 case 'c':
1121 change_comment = 1;
1122 break;
5260325f 1123 case 'f':
c784ae09 1124 if (strlcpy(identity_file, optarg, sizeof(identity_file)) >=
1125 sizeof(identity_file))
1126 fatal("Identity filename too long");
5260325f 1127 have_identity = 1;
1128 break;
21289cd0 1129 case 'g':
1130 print_generic = 1;
1131 break;
5260325f 1132 case 'P':
1133 identity_passphrase = optarg;
1134 break;
5260325f 1135 case 'N':
1136 identity_new_passphrase = optarg;
1137 break;
5260325f 1138 case 'C':
1139 identity_comment = optarg;
1140 break;
5260325f 1141 case 'q':
1142 quiet = 1;
1143 break;
5deceabb 1144 case 'e':
a306f2dd 1145 case 'x':
5deceabb 1146 /* export key */
a306f2dd 1147 convert_to_ssh2 = 1;
1148 break;
5deceabb 1149 case 'i':
a306f2dd 1150 case 'X':
5deceabb 1151 /* import key */
a306f2dd 1152 convert_from_ssh2 = 1;
1153 break;
a306f2dd 1154 case 'y':
1155 print_public = 1;
1156 break;
a306f2dd 1157 case 'd':
fa08c86b 1158 key_type_name = "dsa";
a306f2dd 1159 break;
fa08c86b 1160 case 't':
1161 key_type_name = optarg;
fa08c86b 1162 break;
93a56445 1163 case 'D':
1164 download = 1;
32596c7b 1165 /*FALLTHROUGH*/
285d2b15 1166 case 'U':
93a56445 1167 reader_id = optarg;
2b30154a 1168 break;
c6fbc95a 1169 case 'v':
1170 if (log_level == SYSLOG_LEVEL_INFO)
1171 log_level = SYSLOG_LEVEL_DEBUG1;
1172 else {
f2107e97 1173 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
c6fbc95a 1174 log_level < SYSLOG_LEVEL_DEBUG3)
1175 log_level++;
1176 }
1177 break;
21289cd0 1178 case 'r':
bdffbcdc 1179 rr_hostname = optarg;
21289cd0 1180 break;
c35a6dc5 1181 case 'W':
0fe9892f 1182 generator_wanted = (u_int32_t)strtonum(optarg, 1,
1183 UINT_MAX, &errstr);
c784ae09 1184 if (errstr)
1185 fatal("Desired generator has bad value: %s (%s)",
1186 optarg, errstr);
c35a6dc5 1187 break;
1188 case 'a':
0fe9892f 1189 trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
c784ae09 1190 if (errstr)
1191 fatal("Invalid number of trials: %s (%s)",
1192 optarg, errstr);
c35a6dc5 1193 break;
1194 case 'M':
0fe9892f 1195 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr);
c784ae09 1196 if (errstr) {
1197 fatal("Memory limit is %s: %s", errstr, optarg);
1198 }
c35a6dc5 1199 break;
1200 case 'G':
1201 do_gen_candidates = 1;
c784ae09 1202 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1203 sizeof(out_file))
1204 fatal("Output filename too long");
c35a6dc5 1205 break;
1206 case 'T':
1207 do_screen_candidates = 1;
c784ae09 1208 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
1209 sizeof(out_file))
1210 fatal("Output filename too long");
c35a6dc5 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;
5260325f 1217 case '?':
1218 default:
1219 usage();
1220 }
1221 }
c6fbc95a 1222
1223 /* reinit */
4b4810d4 1224 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
c6fbc95a 1225
4b4810d4 1226 if (optind < argc) {
5260325f 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 }
bdffbcdc 1234 if (delete_host || hash_hosts || find_host)
1235 do_known_hosts(pw, rr_hostname);
aaf45d87 1236 if (print_fingerprint || print_bubblebabble)
5260325f 1237 do_fingerprint(pw);
5260325f 1238 if (change_passphrase)
1239 do_change_passphrase(pw);
633151a3 1240 if (change_comment)
1241 do_change_comment(pw);
ce88d9df 1242 if (convert_to_ssh2)
1243 do_convert_to_ssh2(pw);
1244 if (convert_from_ssh2)
1245 do_convert_from_ssh2(pw);
a306f2dd 1246 if (print_public)
1247 do_print_public(pw);
bdffbcdc 1248 if (rr_hostname != NULL) {
3eff92ec 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 }
21289cd0 1270 }
93a56445 1271 if (reader_id != NULL) {
4f831fd7 1272#ifdef SMARTCARD
93a56445 1273 if (download)
1274 do_download(pw, reader_id);
1275 else
1276 do_upload(pw, reader_id);
3e984472 1277#else /* SMARTCARD */
4f831fd7 1278 fatal("no support for smartcards.");
3e984472 1279#endif /* SMARTCARD */
93a56445 1280 }
5260325f 1281
c35a6dc5 1282 if (do_gen_candidates) {
1283 FILE *out = fopen(out_file, "w");
b6453d99 1284
c35a6dc5 1285 if (out == NULL) {
1286 error("Couldn't open modulus candidate file \"%s\": %s",
1287 out_file, strerror(errno));
1288 return (1);
1289 }
255d3e00 1290 if (bits == 0)
1291 bits = DEFAULT_BITS;
c35a6dc5 1292 if (gen_candidates(out, memory, bits, start) != 0)
17318dd6 1293 fatal("modulus candidate generation failed");
c35a6dc5 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 "
aff51935 1305 "file \"%s\": %s", identity_file,
c35a6dc5 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)
17318dd6 1316 fatal("modulus screening failed");
08d035b6 1317 return (0);
c35a6dc5 1318 }
1319
5260325f 1320 arc4random_stir();
1321
882c9d5a 1322 if (key_type_name == NULL)
1323 key_type_name = "rsa";
1324
c523303b 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);
a306f2dd 1329 }
255d3e00 1330 if (bits == 0)
1331 bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS;
6e94bd72 1332 if (type == KEY_DSA && bits != 1024)
1333 fatal("DSA keys must be 1024 bits");
60dc0294 1334 if (!quiet)
1335 printf("Generating public/private %s key pair.\n", key_type_name);
fa08c86b 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);
5260325f 1342
1343 if (!have_identity)
1344 ask_filename(pw, "Enter file in which to save the key");
1345
7b9b0103 1346 /* Create ~/.ssh directory if it doesn't already exist. */
42f11eb2 1347 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR);
5260325f 1348 if (strstr(identity_file, dotsshdir) != NULL &&
1349 stat(dotsshdir, &st) < 0) {
704b1659 1350 if (mkdir(dotsshdir, 0700) < 0)
5260325f 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 {
1372passphrase_again:
1373 passphrase1 =
1843a425 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);
5260325f 1378 if (strcmp(passphrase1, passphrase2) != 0) {
1843a425 1379 /*
1380 * The passphrases do not match. Clear them and
1381 * retry.
1382 */
5260325f 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
5260325f 1395 if (identity_comment) {
1396 strlcpy(comment, identity_comment, sizeof(comment));
1397 } else {
6ae2364d 1398 /* Create default commend field for the passphrase. */
5260325f 1399 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
1400 }
1401
1402 /* Save the key with the given passphrase and comment. */
aeaa3d9e 1403 if (!key_save_private(private, identity_file, passphrase1, comment)) {
58cfa257 1404 printf("Saving the key failed: %s.\n", identity_file);
5260325f 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. */
fa08c86b 1414 key_free(private);
5260325f 1415 arc4random_stir();
1416
1417 if (!quiet)
1418 printf("Your identification has been saved in %s.\n", identity_file);
1419
5260325f 1420 strlcat(identity_file, ".pub", sizeof(identity_file));
1c9a907f 1421 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1422 if (fd == -1) {
5260325f 1423 printf("Could not save your public key in %s\n", identity_file);
1424 exit(1);
1425 }
1c9a907f 1426 f = fdopen(fd, "w");
1427 if (f == NULL) {
1428 printf("fdopen %s failed", identity_file);
1429 exit(1);
1430 }
a306f2dd 1431 if (!key_write(public, f))
1432 fprintf(stderr, "write key failed");
1433 fprintf(f, " %s\n", comment);
5260325f 1434 fclose(f);
1435
1436 if (!quiet) {
22138a36 1437 char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX);
a306f2dd 1438 printf("Your public key has been saved in %s.\n",
1439 identity_file);
5260325f 1440 printf("The key fingerprint is:\n");
22138a36 1441 printf("%s %s\n", fp, comment);
1442 xfree(fp);
8efc0c15 1443 }
a306f2dd 1444
1445 key_free(public);
5260325f 1446 exit(0);
8efc0c15 1447}
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