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1 | /* $OpenBSD: ssh-keygen.c,v 1.154 2006/08/03 03:34:42 deraadt Exp $ */ | |
2 | /* | |
3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
4 | * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
5 | * All rights reserved | |
6 | * Identity and host key generation and maintenance. | |
7 | * | |
8 | * As far as I am concerned, the code I have written for this software | |
9 | * can be used freely for any purpose. Any derived versions of this | |
10 | * software must be clearly marked as such, and if the derived work is | |
11 | * incompatible with the protocol description in the RFC file, it must be | |
12 | * called by a name other than "ssh" or "Secure Shell". | |
13 | */ | |
14 | ||
15 | #include "includes.h" | |
16 | ||
17 | #include <sys/types.h> | |
18 | #include <sys/socket.h> | |
19 | #include <sys/stat.h> | |
20 | #include <sys/param.h> | |
21 | ||
22 | #include <openssl/evp.h> | |
23 | #include <openssl/pem.h> | |
24 | ||
25 | #include <errno.h> | |
26 | #include <fcntl.h> | |
27 | #include <netdb.h> | |
28 | #ifdef HAVE_PATHS_H | |
29 | # include <paths.h> | |
30 | #endif | |
31 | #include <pwd.h> | |
32 | #include <stdio.h> | |
33 | #include <stdlib.h> | |
34 | #include <string.h> | |
35 | #include <unistd.h> | |
36 | ||
37 | #include "xmalloc.h" | |
38 | #include "key.h" | |
39 | #include "rsa.h" | |
40 | #include "authfile.h" | |
41 | #include "uuencode.h" | |
42 | #include "buffer.h" | |
43 | #include "pathnames.h" | |
44 | #include "log.h" | |
45 | #include "misc.h" | |
46 | #include "match.h" | |
47 | #include "hostfile.h" | |
48 | #include "dns.h" | |
49 | ||
50 | #ifdef SMARTCARD | |
51 | #include "scard.h" | |
52 | #endif | |
53 | ||
54 | /* Number of bits in the RSA/DSA key. This value can be set on the command line. */ | |
55 | #define DEFAULT_BITS 2048 | |
56 | #define DEFAULT_BITS_DSA 1024 | |
57 | u_int32_t bits = 0; | |
58 | ||
59 | /* | |
60 | * Flag indicating that we just want to change the passphrase. This can be | |
61 | * set on the command line. | |
62 | */ | |
63 | int change_passphrase = 0; | |
64 | ||
65 | /* | |
66 | * Flag indicating that we just want to change the comment. This can be set | |
67 | * on the command line. | |
68 | */ | |
69 | int change_comment = 0; | |
70 | ||
71 | int quiet = 0; | |
72 | ||
73 | /* Flag indicating that we want to hash a known_hosts file */ | |
74 | int hash_hosts = 0; | |
75 | /* Flag indicating that we want lookup a host in known_hosts file */ | |
76 | int find_host = 0; | |
77 | /* Flag indicating that we want to delete a host from a known_hosts file */ | |
78 | int delete_host = 0; | |
79 | ||
80 | /* Flag indicating that we just want to see the key fingerprint */ | |
81 | int print_fingerprint = 0; | |
82 | int print_bubblebabble = 0; | |
83 | ||
84 | /* The identity file name, given on the command line or entered by the user. */ | |
85 | char identity_file[1024]; | |
86 | int have_identity = 0; | |
87 | ||
88 | /* This is set to the passphrase if given on the command line. */ | |
89 | char *identity_passphrase = NULL; | |
90 | ||
91 | /* This is set to the new passphrase if given on the command line. */ | |
92 | char *identity_new_passphrase = NULL; | |
93 | ||
94 | /* This is set to the new comment if given on the command line. */ | |
95 | char *identity_comment = NULL; | |
96 | ||
97 | /* Dump public key file in format used by real and the original SSH 2 */ | |
98 | int convert_to_ssh2 = 0; | |
99 | int convert_from_ssh2 = 0; | |
100 | int print_public = 0; | |
101 | int print_generic = 0; | |
102 | ||
103 | char *key_type_name = NULL; | |
104 | ||
105 | /* argv0 */ | |
106 | extern char *__progname; | |
107 | ||
108 | char hostname[MAXHOSTNAMELEN]; | |
109 | ||
110 | /* moduli.c */ | |
111 | int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); | |
112 | int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); | |
113 | ||
114 | static void | |
115 | ask_filename(struct passwd *pw, const char *prompt) | |
116 | { | |
117 | char buf[1024]; | |
118 | char *name = NULL; | |
119 | ||
120 | if (key_type_name == NULL) | |
121 | name = _PATH_SSH_CLIENT_ID_RSA; | |
122 | else { | |
123 | switch (key_type_from_name(key_type_name)) { | |
124 | case KEY_RSA1: | |
125 | name = _PATH_SSH_CLIENT_IDENTITY; | |
126 | break; | |
127 | case KEY_DSA: | |
128 | name = _PATH_SSH_CLIENT_ID_DSA; | |
129 | break; | |
130 | case KEY_RSA: | |
131 | name = _PATH_SSH_CLIENT_ID_RSA; | |
132 | break; | |
133 | default: | |
134 | fprintf(stderr, "bad key type"); | |
135 | exit(1); | |
136 | break; | |
137 | } | |
138 | } | |
139 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); | |
140 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
141 | if (fgets(buf, sizeof(buf), stdin) == NULL) | |
142 | exit(1); | |
143 | if (strchr(buf, '\n')) | |
144 | *strchr(buf, '\n') = 0; | |
145 | if (strcmp(buf, "") != 0) | |
146 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
147 | have_identity = 1; | |
148 | } | |
149 | ||
150 | static Key * | |
151 | load_identity(char *filename) | |
152 | { | |
153 | char *pass; | |
154 | Key *prv; | |
155 | ||
156 | prv = key_load_private(filename, "", NULL); | |
157 | if (prv == NULL) { | |
158 | if (identity_passphrase) | |
159 | pass = xstrdup(identity_passphrase); | |
160 | else | |
161 | pass = read_passphrase("Enter passphrase: ", | |
162 | RP_ALLOW_STDIN); | |
163 | prv = key_load_private(filename, pass, NULL); | |
164 | memset(pass, 0, strlen(pass)); | |
165 | xfree(pass); | |
166 | } | |
167 | return prv; | |
168 | } | |
169 | ||
170 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
171 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" | |
172 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" | |
173 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
174 | ||
175 | static void | |
176 | do_convert_to_ssh2(struct passwd *pw) | |
177 | { | |
178 | Key *k; | |
179 | u_int len; | |
180 | u_char *blob; | |
181 | struct stat st; | |
182 | ||
183 | if (!have_identity) | |
184 | ask_filename(pw, "Enter file in which the key is"); | |
185 | if (stat(identity_file, &st) < 0) { | |
186 | perror(identity_file); | |
187 | exit(1); | |
188 | } | |
189 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
190 | if ((k = load_identity(identity_file)) == NULL) { | |
191 | fprintf(stderr, "load failed\n"); | |
192 | exit(1); | |
193 | } | |
194 | } | |
195 | if (k->type == KEY_RSA1) { | |
196 | fprintf(stderr, "version 1 keys are not supported\n"); | |
197 | exit(1); | |
198 | } | |
199 | if (key_to_blob(k, &blob, &len) <= 0) { | |
200 | fprintf(stderr, "key_to_blob failed\n"); | |
201 | exit(1); | |
202 | } | |
203 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
204 | fprintf(stdout, | |
205 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", | |
206 | key_size(k), key_type(k), | |
207 | pw->pw_name, hostname); | |
208 | dump_base64(stdout, blob, len); | |
209 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
210 | key_free(k); | |
211 | xfree(blob); | |
212 | exit(0); | |
213 | } | |
214 | ||
215 | static void | |
216 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
217 | { | |
218 | u_int bignum_bits = buffer_get_int(b); | |
219 | u_int bytes = (bignum_bits + 7) / 8; | |
220 | ||
221 | if (buffer_len(b) < bytes) | |
222 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
223 | "need %d have %d", bytes, buffer_len(b)); | |
224 | BN_bin2bn(buffer_ptr(b), bytes, value); | |
225 | buffer_consume(b, bytes); | |
226 | } | |
227 | ||
228 | static Key * | |
229 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) | |
230 | { | |
231 | Buffer b; | |
232 | Key *key = NULL; | |
233 | char *type, *cipher; | |
234 | u_char *sig, data[] = "abcde12345"; | |
235 | int magic, rlen, ktype, i1, i2, i3, i4; | |
236 | u_int slen; | |
237 | u_long e; | |
238 | ||
239 | buffer_init(&b); | |
240 | buffer_append(&b, blob, blen); | |
241 | ||
242 | magic = buffer_get_int(&b); | |
243 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
244 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
245 | buffer_free(&b); | |
246 | return NULL; | |
247 | } | |
248 | i1 = buffer_get_int(&b); | |
249 | type = buffer_get_string(&b, NULL); | |
250 | cipher = buffer_get_string(&b, NULL); | |
251 | i2 = buffer_get_int(&b); | |
252 | i3 = buffer_get_int(&b); | |
253 | i4 = buffer_get_int(&b); | |
254 | debug("ignore (%d %d %d %d)", i1,i2,i3,i4); | |
255 | if (strcmp(cipher, "none") != 0) { | |
256 | error("unsupported cipher %s", cipher); | |
257 | xfree(cipher); | |
258 | buffer_free(&b); | |
259 | xfree(type); | |
260 | return NULL; | |
261 | } | |
262 | xfree(cipher); | |
263 | ||
264 | if (strstr(type, "dsa")) { | |
265 | ktype = KEY_DSA; | |
266 | } else if (strstr(type, "rsa")) { | |
267 | ktype = KEY_RSA; | |
268 | } else { | |
269 | buffer_free(&b); | |
270 | xfree(type); | |
271 | return NULL; | |
272 | } | |
273 | key = key_new_private(ktype); | |
274 | xfree(type); | |
275 | ||
276 | switch (key->type) { | |
277 | case KEY_DSA: | |
278 | buffer_get_bignum_bits(&b, key->dsa->p); | |
279 | buffer_get_bignum_bits(&b, key->dsa->g); | |
280 | buffer_get_bignum_bits(&b, key->dsa->q); | |
281 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
282 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
283 | break; | |
284 | case KEY_RSA: | |
285 | e = buffer_get_char(&b); | |
286 | debug("e %lx", e); | |
287 | if (e < 30) { | |
288 | e <<= 8; | |
289 | e += buffer_get_char(&b); | |
290 | debug("e %lx", e); | |
291 | e <<= 8; | |
292 | e += buffer_get_char(&b); | |
293 | debug("e %lx", e); | |
294 | } | |
295 | if (!BN_set_word(key->rsa->e, e)) { | |
296 | buffer_free(&b); | |
297 | key_free(key); | |
298 | return NULL; | |
299 | } | |
300 | buffer_get_bignum_bits(&b, key->rsa->d); | |
301 | buffer_get_bignum_bits(&b, key->rsa->n); | |
302 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
303 | buffer_get_bignum_bits(&b, key->rsa->q); | |
304 | buffer_get_bignum_bits(&b, key->rsa->p); | |
305 | rsa_generate_additional_parameters(key->rsa); | |
306 | break; | |
307 | } | |
308 | rlen = buffer_len(&b); | |
309 | if (rlen != 0) | |
310 | error("do_convert_private_ssh2_from_blob: " | |
311 | "remaining bytes in key blob %d", rlen); | |
312 | buffer_free(&b); | |
313 | ||
314 | /* try the key */ | |
315 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
316 | key_verify(key, sig, slen, data, sizeof(data)); | |
317 | xfree(sig); | |
318 | return key; | |
319 | } | |
320 | ||
321 | static int | |
322 | get_line(FILE *fp, char *line, size_t len) | |
323 | { | |
324 | int c; | |
325 | size_t pos = 0; | |
326 | ||
327 | line[0] = '\0'; | |
328 | while ((c = fgetc(fp)) != EOF) { | |
329 | if (pos >= len - 1) { | |
330 | fprintf(stderr, "input line too long.\n"); | |
331 | exit(1); | |
332 | } | |
333 | switch (c) { | |
334 | case '\r': | |
335 | c = fgetc(fp); | |
336 | if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { | |
337 | fprintf(stderr, "unget: %s\n", strerror(errno)); | |
338 | exit(1); | |
339 | } | |
340 | return pos; | |
341 | case '\n': | |
342 | return pos; | |
343 | } | |
344 | line[pos++] = c; | |
345 | line[pos] = '\0'; | |
346 | } | |
347 | if (c == EOF) | |
348 | return -1; | |
349 | return pos; | |
350 | } | |
351 | ||
352 | static void | |
353 | do_convert_from_ssh2(struct passwd *pw) | |
354 | { | |
355 | Key *k; | |
356 | int blen; | |
357 | u_int len; | |
358 | char line[1024]; | |
359 | u_char blob[8096]; | |
360 | char encoded[8096]; | |
361 | struct stat st; | |
362 | int escaped = 0, private = 0, ok; | |
363 | FILE *fp; | |
364 | ||
365 | if (!have_identity) | |
366 | ask_filename(pw, "Enter file in which the key is"); | |
367 | if (stat(identity_file, &st) < 0) { | |
368 | perror(identity_file); | |
369 | exit(1); | |
370 | } | |
371 | fp = fopen(identity_file, "r"); | |
372 | if (fp == NULL) { | |
373 | perror(identity_file); | |
374 | exit(1); | |
375 | } | |
376 | encoded[0] = '\0'; | |
377 | while ((blen = get_line(fp, line, sizeof(line))) != -1) { | |
378 | if (line[blen - 1] == '\\') | |
379 | escaped++; | |
380 | if (strncmp(line, "----", 4) == 0 || | |
381 | strstr(line, ": ") != NULL) { | |
382 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
383 | private = 1; | |
384 | if (strstr(line, " END ") != NULL) { | |
385 | break; | |
386 | } | |
387 | /* fprintf(stderr, "ignore: %s", line); */ | |
388 | continue; | |
389 | } | |
390 | if (escaped) { | |
391 | escaped--; | |
392 | /* fprintf(stderr, "escaped: %s", line); */ | |
393 | continue; | |
394 | } | |
395 | strlcat(encoded, line, sizeof(encoded)); | |
396 | } | |
397 | len = strlen(encoded); | |
398 | if (((len % 4) == 3) && | |
399 | (encoded[len-1] == '=') && | |
400 | (encoded[len-2] == '=') && | |
401 | (encoded[len-3] == '=')) | |
402 | encoded[len-3] = '\0'; | |
403 | blen = uudecode(encoded, blob, sizeof(blob)); | |
404 | if (blen < 0) { | |
405 | fprintf(stderr, "uudecode failed.\n"); | |
406 | exit(1); | |
407 | } | |
408 | k = private ? | |
409 | do_convert_private_ssh2_from_blob(blob, blen) : | |
410 | key_from_blob(blob, blen); | |
411 | if (k == NULL) { | |
412 | fprintf(stderr, "decode blob failed.\n"); | |
413 | exit(1); | |
414 | } | |
415 | ok = private ? | |
416 | (k->type == KEY_DSA ? | |
417 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
418 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
419 | key_write(k, stdout); | |
420 | if (!ok) { | |
421 | fprintf(stderr, "key write failed"); | |
422 | exit(1); | |
423 | } | |
424 | key_free(k); | |
425 | if (!private) | |
426 | fprintf(stdout, "\n"); | |
427 | fclose(fp); | |
428 | exit(0); | |
429 | } | |
430 | ||
431 | static void | |
432 | do_print_public(struct passwd *pw) | |
433 | { | |
434 | Key *prv; | |
435 | struct stat st; | |
436 | ||
437 | if (!have_identity) | |
438 | ask_filename(pw, "Enter file in which the key is"); | |
439 | if (stat(identity_file, &st) < 0) { | |
440 | perror(identity_file); | |
441 | exit(1); | |
442 | } | |
443 | prv = load_identity(identity_file); | |
444 | if (prv == NULL) { | |
445 | fprintf(stderr, "load failed\n"); | |
446 | exit(1); | |
447 | } | |
448 | if (!key_write(prv, stdout)) | |
449 | fprintf(stderr, "key_write failed"); | |
450 | key_free(prv); | |
451 | fprintf(stdout, "\n"); | |
452 | exit(0); | |
453 | } | |
454 | ||
455 | #ifdef SMARTCARD | |
456 | static void | |
457 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
458 | { | |
459 | Key *prv = NULL; | |
460 | struct stat st; | |
461 | int ret; | |
462 | ||
463 | if (!have_identity) | |
464 | ask_filename(pw, "Enter file in which the key is"); | |
465 | if (stat(identity_file, &st) < 0) { | |
466 | perror(identity_file); | |
467 | exit(1); | |
468 | } | |
469 | prv = load_identity(identity_file); | |
470 | if (prv == NULL) { | |
471 | error("load failed"); | |
472 | exit(1); | |
473 | } | |
474 | ret = sc_put_key(prv, sc_reader_id); | |
475 | key_free(prv); | |
476 | if (ret < 0) | |
477 | exit(1); | |
478 | logit("loading key done"); | |
479 | exit(0); | |
480 | } | |
481 | ||
482 | static void | |
483 | do_download(struct passwd *pw, const char *sc_reader_id) | |
484 | { | |
485 | Key **keys = NULL; | |
486 | int i; | |
487 | ||
488 | keys = sc_get_keys(sc_reader_id, NULL); | |
489 | if (keys == NULL) | |
490 | fatal("cannot read public key from smartcard"); | |
491 | for (i = 0; keys[i]; i++) { | |
492 | key_write(keys[i], stdout); | |
493 | key_free(keys[i]); | |
494 | fprintf(stdout, "\n"); | |
495 | } | |
496 | xfree(keys); | |
497 | exit(0); | |
498 | } | |
499 | #endif /* SMARTCARD */ | |
500 | ||
501 | static void | |
502 | do_fingerprint(struct passwd *pw) | |
503 | { | |
504 | FILE *f; | |
505 | Key *public; | |
506 | char *comment = NULL, *cp, *ep, line[16*1024], *fp; | |
507 | int i, skip = 0, num = 1, invalid = 1; | |
508 | enum fp_rep rep; | |
509 | enum fp_type fptype; | |
510 | struct stat st; | |
511 | ||
512 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
513 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
514 | ||
515 | if (!have_identity) | |
516 | ask_filename(pw, "Enter file in which the key is"); | |
517 | if (stat(identity_file, &st) < 0) { | |
518 | perror(identity_file); | |
519 | exit(1); | |
520 | } | |
521 | public = key_load_public(identity_file, &comment); | |
522 | if (public != NULL) { | |
523 | fp = key_fingerprint(public, fptype, rep); | |
524 | printf("%u %s %s\n", key_size(public), fp, comment); | |
525 | key_free(public); | |
526 | xfree(comment); | |
527 | xfree(fp); | |
528 | exit(0); | |
529 | } | |
530 | if (comment) { | |
531 | xfree(comment); | |
532 | comment = NULL; | |
533 | } | |
534 | ||
535 | f = fopen(identity_file, "r"); | |
536 | if (f != NULL) { | |
537 | while (fgets(line, sizeof(line), f)) { | |
538 | i = strlen(line) - 1; | |
539 | if (line[i] != '\n') { | |
540 | error("line %d too long: %.40s...", num, line); | |
541 | skip = 1; | |
542 | continue; | |
543 | } | |
544 | num++; | |
545 | if (skip) { | |
546 | skip = 0; | |
547 | continue; | |
548 | } | |
549 | line[i] = '\0'; | |
550 | ||
551 | /* Skip leading whitespace, empty and comment lines. */ | |
552 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
553 | ; | |
554 | if (!*cp || *cp == '\n' || *cp == '#') | |
555 | continue ; | |
556 | i = strtol(cp, &ep, 10); | |
557 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
558 | int quoted = 0; | |
559 | comment = cp; | |
560 | for (; *cp && (quoted || (*cp != ' ' && | |
561 | *cp != '\t')); cp++) { | |
562 | if (*cp == '\\' && cp[1] == '"') | |
563 | cp++; /* Skip both */ | |
564 | else if (*cp == '"') | |
565 | quoted = !quoted; | |
566 | } | |
567 | if (!*cp) | |
568 | continue; | |
569 | *cp++ = '\0'; | |
570 | } | |
571 | ep = cp; | |
572 | public = key_new(KEY_RSA1); | |
573 | if (key_read(public, &cp) != 1) { | |
574 | cp = ep; | |
575 | key_free(public); | |
576 | public = key_new(KEY_UNSPEC); | |
577 | if (key_read(public, &cp) != 1) { | |
578 | key_free(public); | |
579 | continue; | |
580 | } | |
581 | } | |
582 | comment = *cp ? cp : comment; | |
583 | fp = key_fingerprint(public, fptype, rep); | |
584 | printf("%u %s %s\n", key_size(public), fp, | |
585 | comment ? comment : "no comment"); | |
586 | xfree(fp); | |
587 | key_free(public); | |
588 | invalid = 0; | |
589 | } | |
590 | fclose(f); | |
591 | } | |
592 | if (invalid) { | |
593 | printf("%s is not a public key file.\n", identity_file); | |
594 | exit(1); | |
595 | } | |
596 | exit(0); | |
597 | } | |
598 | ||
599 | static void | |
600 | print_host(FILE *f, char *name, Key *public, int hash) | |
601 | { | |
602 | if (hash && (name = host_hash(name, NULL, 0)) == NULL) | |
603 | fatal("hash_host failed"); | |
604 | fprintf(f, "%s ", name); | |
605 | if (!key_write(public, f)) | |
606 | fatal("key_write failed"); | |
607 | fprintf(f, "\n"); | |
608 | } | |
609 | ||
610 | static void | |
611 | do_known_hosts(struct passwd *pw, const char *name) | |
612 | { | |
613 | FILE *in, *out = stdout; | |
614 | Key *public; | |
615 | char *cp, *cp2, *kp, *kp2; | |
616 | char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; | |
617 | int c, i, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; | |
618 | ||
619 | if (!have_identity) { | |
620 | cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); | |
621 | if (strlcpy(identity_file, cp, sizeof(identity_file)) >= | |
622 | sizeof(identity_file)) | |
623 | fatal("Specified known hosts path too long"); | |
624 | xfree(cp); | |
625 | have_identity = 1; | |
626 | } | |
627 | if ((in = fopen(identity_file, "r")) == NULL) | |
628 | fatal("fopen: %s", strerror(errno)); | |
629 | ||
630 | /* | |
631 | * Find hosts goes to stdout, hash and deletions happen in-place | |
632 | * A corner case is ssh-keygen -HF foo, which should go to stdout | |
633 | */ | |
634 | if (!find_host && (hash_hosts || delete_host)) { | |
635 | if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || | |
636 | strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || | |
637 | strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || | |
638 | strlcat(old, ".old", sizeof(old)) >= sizeof(old)) | |
639 | fatal("known_hosts path too long"); | |
640 | umask(077); | |
641 | if ((c = mkstemp(tmp)) == -1) | |
642 | fatal("mkstemp: %s", strerror(errno)); | |
643 | if ((out = fdopen(c, "w")) == NULL) { | |
644 | c = errno; | |
645 | unlink(tmp); | |
646 | fatal("fdopen: %s", strerror(c)); | |
647 | } | |
648 | inplace = 1; | |
649 | } | |
650 | ||
651 | while (fgets(line, sizeof(line), in)) { | |
652 | num++; | |
653 | i = strlen(line) - 1; | |
654 | if (line[i] != '\n') { | |
655 | error("line %d too long: %.40s...", num, line); | |
656 | skip = 1; | |
657 | invalid = 1; | |
658 | continue; | |
659 | } | |
660 | if (skip) { | |
661 | skip = 0; | |
662 | continue; | |
663 | } | |
664 | line[i] = '\0'; | |
665 | ||
666 | /* Skip leading whitespace, empty and comment lines. */ | |
667 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
668 | ; | |
669 | if (!*cp || *cp == '\n' || *cp == '#') { | |
670 | if (inplace) | |
671 | fprintf(out, "%s\n", cp); | |
672 | continue; | |
673 | } | |
674 | /* Find the end of the host name portion. */ | |
675 | for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) | |
676 | ; | |
677 | if (*kp == '\0' || *(kp + 1) == '\0') { | |
678 | error("line %d missing key: %.40s...", | |
679 | num, line); | |
680 | invalid = 1; | |
681 | continue; | |
682 | } | |
683 | *kp++ = '\0'; | |
684 | kp2 = kp; | |
685 | ||
686 | public = key_new(KEY_RSA1); | |
687 | if (key_read(public, &kp) != 1) { | |
688 | kp = kp2; | |
689 | key_free(public); | |
690 | public = key_new(KEY_UNSPEC); | |
691 | if (key_read(public, &kp) != 1) { | |
692 | error("line %d invalid key: %.40s...", | |
693 | num, line); | |
694 | key_free(public); | |
695 | invalid = 1; | |
696 | continue; | |
697 | } | |
698 | } | |
699 | ||
700 | if (*cp == HASH_DELIM) { | |
701 | if (find_host || delete_host) { | |
702 | cp2 = host_hash(name, cp, strlen(cp)); | |
703 | if (cp2 == NULL) { | |
704 | error("line %d: invalid hashed " | |
705 | "name: %.64s...", num, line); | |
706 | invalid = 1; | |
707 | continue; | |
708 | } | |
709 | c = (strcmp(cp2, cp) == 0); | |
710 | if (find_host && c) { | |
711 | printf("# Host %s found: " | |
712 | "line %d type %s\n", name, | |
713 | num, key_type(public)); | |
714 | print_host(out, cp, public, 0); | |
715 | } | |
716 | if (delete_host && !c) | |
717 | print_host(out, cp, public, 0); | |
718 | } else if (hash_hosts) | |
719 | print_host(out, cp, public, 0); | |
720 | } else { | |
721 | if (find_host || delete_host) { | |
722 | c = (match_hostname(name, cp, | |
723 | strlen(cp)) == 1); | |
724 | if (find_host && c) { | |
725 | printf("# Host %s found: " | |
726 | "line %d type %s\n", name, | |
727 | num, key_type(public)); | |
728 | print_host(out, cp, public, hash_hosts); | |
729 | } | |
730 | if (delete_host && !c) | |
731 | print_host(out, cp, public, 0); | |
732 | } else if (hash_hosts) { | |
733 | for (cp2 = strsep(&cp, ","); | |
734 | cp2 != NULL && *cp2 != '\0'; | |
735 | cp2 = strsep(&cp, ",")) { | |
736 | if (strcspn(cp2, "*?!") != strlen(cp2)) | |
737 | fprintf(stderr, "Warning: " | |
738 | "ignoring host name with " | |
739 | "metacharacters: %.64s\n", | |
740 | cp2); | |
741 | else | |
742 | print_host(out, cp2, public, 1); | |
743 | } | |
744 | has_unhashed = 1; | |
745 | } | |
746 | } | |
747 | key_free(public); | |
748 | } | |
749 | fclose(in); | |
750 | ||
751 | if (invalid) { | |
752 | fprintf(stderr, "%s is not a valid known_host file.\n", | |
753 | identity_file); | |
754 | if (inplace) { | |
755 | fprintf(stderr, "Not replacing existing known_hosts " | |
756 | "file because of errors\n"); | |
757 | fclose(out); | |
758 | unlink(tmp); | |
759 | } | |
760 | exit(1); | |
761 | } | |
762 | ||
763 | if (inplace) { | |
764 | fclose(out); | |
765 | ||
766 | /* Backup existing file */ | |
767 | if (unlink(old) == -1 && errno != ENOENT) | |
768 | fatal("unlink %.100s: %s", old, strerror(errno)); | |
769 | if (link(identity_file, old) == -1) | |
770 | fatal("link %.100s to %.100s: %s", identity_file, old, | |
771 | strerror(errno)); | |
772 | /* Move new one into place */ | |
773 | if (rename(tmp, identity_file) == -1) { | |
774 | error("rename\"%s\" to \"%s\": %s", tmp, identity_file, | |
775 | strerror(errno)); | |
776 | unlink(tmp); | |
777 | unlink(old); | |
778 | exit(1); | |
779 | } | |
780 | ||
781 | fprintf(stderr, "%s updated.\n", identity_file); | |
782 | fprintf(stderr, "Original contents retained as %s\n", old); | |
783 | if (has_unhashed) { | |
784 | fprintf(stderr, "WARNING: %s contains unhashed " | |
785 | "entries\n", old); | |
786 | fprintf(stderr, "Delete this file to ensure privacy " | |
787 | "of hostnames\n"); | |
788 | } | |
789 | } | |
790 | ||
791 | exit(0); | |
792 | } | |
793 | ||
794 | /* | |
795 | * Perform changing a passphrase. The argument is the passwd structure | |
796 | * for the current user. | |
797 | */ | |
798 | static void | |
799 | do_change_passphrase(struct passwd *pw) | |
800 | { | |
801 | char *comment; | |
802 | char *old_passphrase, *passphrase1, *passphrase2; | |
803 | struct stat st; | |
804 | Key *private; | |
805 | ||
806 | if (!have_identity) | |
807 | ask_filename(pw, "Enter file in which the key is"); | |
808 | if (stat(identity_file, &st) < 0) { | |
809 | perror(identity_file); | |
810 | exit(1); | |
811 | } | |
812 | /* Try to load the file with empty passphrase. */ | |
813 | private = key_load_private(identity_file, "", &comment); | |
814 | if (private == NULL) { | |
815 | if (identity_passphrase) | |
816 | old_passphrase = xstrdup(identity_passphrase); | |
817 | else | |
818 | old_passphrase = | |
819 | read_passphrase("Enter old passphrase: ", | |
820 | RP_ALLOW_STDIN); | |
821 | private = key_load_private(identity_file, old_passphrase, | |
822 | &comment); | |
823 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
824 | xfree(old_passphrase); | |
825 | if (private == NULL) { | |
826 | printf("Bad passphrase.\n"); | |
827 | exit(1); | |
828 | } | |
829 | } | |
830 | printf("Key has comment '%s'\n", comment); | |
831 | ||
832 | /* Ask the new passphrase (twice). */ | |
833 | if (identity_new_passphrase) { | |
834 | passphrase1 = xstrdup(identity_new_passphrase); | |
835 | passphrase2 = NULL; | |
836 | } else { | |
837 | passphrase1 = | |
838 | read_passphrase("Enter new passphrase (empty for no " | |
839 | "passphrase): ", RP_ALLOW_STDIN); | |
840 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
841 | RP_ALLOW_STDIN); | |
842 | ||
843 | /* Verify that they are the same. */ | |
844 | if (strcmp(passphrase1, passphrase2) != 0) { | |
845 | memset(passphrase1, 0, strlen(passphrase1)); | |
846 | memset(passphrase2, 0, strlen(passphrase2)); | |
847 | xfree(passphrase1); | |
848 | xfree(passphrase2); | |
849 | printf("Pass phrases do not match. Try again.\n"); | |
850 | exit(1); | |
851 | } | |
852 | /* Destroy the other copy. */ | |
853 | memset(passphrase2, 0, strlen(passphrase2)); | |
854 | xfree(passphrase2); | |
855 | } | |
856 | ||
857 | /* Save the file using the new passphrase. */ | |
858 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
859 | printf("Saving the key failed: %s.\n", identity_file); | |
860 | memset(passphrase1, 0, strlen(passphrase1)); | |
861 | xfree(passphrase1); | |
862 | key_free(private); | |
863 | xfree(comment); | |
864 | exit(1); | |
865 | } | |
866 | /* Destroy the passphrase and the copy of the key in memory. */ | |
867 | memset(passphrase1, 0, strlen(passphrase1)); | |
868 | xfree(passphrase1); | |
869 | key_free(private); /* Destroys contents */ | |
870 | xfree(comment); | |
871 | ||
872 | printf("Your identification has been saved with the new passphrase.\n"); | |
873 | exit(0); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Print the SSHFP RR. | |
878 | */ | |
879 | static int | |
880 | do_print_resource_record(struct passwd *pw, char *fname, char *hname) | |
881 | { | |
882 | Key *public; | |
883 | char *comment = NULL; | |
884 | struct stat st; | |
885 | ||
886 | if (fname == NULL) | |
887 | ask_filename(pw, "Enter file in which the key is"); | |
888 | if (stat(fname, &st) < 0) { | |
889 | if (errno == ENOENT) | |
890 | return 0; | |
891 | perror(fname); | |
892 | exit(1); | |
893 | } | |
894 | public = key_load_public(fname, &comment); | |
895 | if (public != NULL) { | |
896 | export_dns_rr(hname, public, stdout, print_generic); | |
897 | key_free(public); | |
898 | xfree(comment); | |
899 | return 1; | |
900 | } | |
901 | if (comment) | |
902 | xfree(comment); | |
903 | ||
904 | printf("failed to read v2 public key from %s.\n", fname); | |
905 | exit(1); | |
906 | } | |
907 | ||
908 | /* | |
909 | * Change the comment of a private key file. | |
910 | */ | |
911 | static void | |
912 | do_change_comment(struct passwd *pw) | |
913 | { | |
914 | char new_comment[1024], *comment, *passphrase; | |
915 | Key *private; | |
916 | Key *public; | |
917 | struct stat st; | |
918 | FILE *f; | |
919 | int fd; | |
920 | ||
921 | if (!have_identity) | |
922 | ask_filename(pw, "Enter file in which the key is"); | |
923 | if (stat(identity_file, &st) < 0) { | |
924 | perror(identity_file); | |
925 | exit(1); | |
926 | } | |
927 | private = key_load_private(identity_file, "", &comment); | |
928 | if (private == NULL) { | |
929 | if (identity_passphrase) | |
930 | passphrase = xstrdup(identity_passphrase); | |
931 | else if (identity_new_passphrase) | |
932 | passphrase = xstrdup(identity_new_passphrase); | |
933 | else | |
934 | passphrase = read_passphrase("Enter passphrase: ", | |
935 | RP_ALLOW_STDIN); | |
936 | /* Try to load using the passphrase. */ | |
937 | private = key_load_private(identity_file, passphrase, &comment); | |
938 | if (private == NULL) { | |
939 | memset(passphrase, 0, strlen(passphrase)); | |
940 | xfree(passphrase); | |
941 | printf("Bad passphrase.\n"); | |
942 | exit(1); | |
943 | } | |
944 | } else { | |
945 | passphrase = xstrdup(""); | |
946 | } | |
947 | if (private->type != KEY_RSA1) { | |
948 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
949 | key_free(private); | |
950 | exit(1); | |
951 | } | |
952 | printf("Key now has comment '%s'\n", comment); | |
953 | ||
954 | if (identity_comment) { | |
955 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
956 | } else { | |
957 | printf("Enter new comment: "); | |
958 | fflush(stdout); | |
959 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
960 | memset(passphrase, 0, strlen(passphrase)); | |
961 | key_free(private); | |
962 | exit(1); | |
963 | } | |
964 | if (strchr(new_comment, '\n')) | |
965 | *strchr(new_comment, '\n') = 0; | |
966 | } | |
967 | ||
968 | /* Save the file using the new passphrase. */ | |
969 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
970 | printf("Saving the key failed: %s.\n", identity_file); | |
971 | memset(passphrase, 0, strlen(passphrase)); | |
972 | xfree(passphrase); | |
973 | key_free(private); | |
974 | xfree(comment); | |
975 | exit(1); | |
976 | } | |
977 | memset(passphrase, 0, strlen(passphrase)); | |
978 | xfree(passphrase); | |
979 | public = key_from_private(private); | |
980 | key_free(private); | |
981 | ||
982 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
983 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
984 | if (fd == -1) { | |
985 | printf("Could not save your public key in %s\n", identity_file); | |
986 | exit(1); | |
987 | } | |
988 | f = fdopen(fd, "w"); | |
989 | if (f == NULL) { | |
990 | printf("fdopen %s failed", identity_file); | |
991 | exit(1); | |
992 | } | |
993 | if (!key_write(public, f)) | |
994 | fprintf(stderr, "write key failed"); | |
995 | key_free(public); | |
996 | fprintf(f, " %s\n", new_comment); | |
997 | fclose(f); | |
998 | ||
999 | xfree(comment); | |
1000 | ||
1001 | printf("The comment in your key file has been changed.\n"); | |
1002 | exit(0); | |
1003 | } | |
1004 | ||
1005 | static void | |
1006 | usage(void) | |
1007 | { | |
1008 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
1009 | fprintf(stderr, "Options:\n"); | |
1010 | fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); | |
1011 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
1012 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
1013 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
1014 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
1015 | #ifdef SMARTCARD | |
1016 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
1017 | #endif /* SMARTCARD */ | |
1018 | fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); | |
1019 | fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); | |
1020 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
1021 | fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); | |
1022 | fprintf(stderr, " -g Use generic DNS resource record format.\n"); | |
1023 | fprintf(stderr, " -H Hash names in known_hosts file.\n"); | |
1024 | fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); | |
1025 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
1026 | fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); | |
1027 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
1028 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
1029 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
1030 | fprintf(stderr, " -q Quiet.\n"); | |
1031 | fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); | |
1032 | fprintf(stderr, " -r hostname Print DNS resource record.\n"); | |
1033 | fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); | |
1034 | fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); | |
1035 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
1036 | #ifdef SMARTCARD | |
1037 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
1038 | #endif /* SMARTCARD */ | |
1039 | fprintf(stderr, " -v Verbose.\n"); | |
1040 | fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); | |
1041 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
1042 | ||
1043 | exit(1); | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Main program for key management. | |
1048 | */ | |
1049 | int | |
1050 | main(int ac, char **av) | |
1051 | { | |
1052 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; | |
1053 | char out_file[MAXPATHLEN], *reader_id = NULL; | |
1054 | char *rr_hostname = NULL; | |
1055 | Key *private, *public; | |
1056 | struct passwd *pw; | |
1057 | struct stat st; | |
1058 | int opt, type, fd, download = 0; | |
1059 | u_int32_t memory = 0, generator_wanted = 0, trials = 100; | |
1060 | int do_gen_candidates = 0, do_screen_candidates = 0; | |
1061 | int log_level = SYSLOG_LEVEL_INFO; | |
1062 | BIGNUM *start = NULL; | |
1063 | FILE *f; | |
1064 | const char *errstr; | |
1065 | ||
1066 | extern int optind; | |
1067 | extern char *optarg; | |
1068 | ||
1069 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
1070 | sanitise_stdfd(); | |
1071 | ||
1072 | __progname = ssh_get_progname(av[0]); | |
1073 | ||
1074 | SSLeay_add_all_algorithms(); | |
1075 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
1076 | ||
1077 | init_rng(); | |
1078 | seed_rng(); | |
1079 | ||
1080 | /* we need this for the home * directory. */ | |
1081 | pw = getpwuid(getuid()); | |
1082 | if (!pw) { | |
1083 | printf("You don't exist, go away!\n"); | |
1084 | exit(1); | |
1085 | } | |
1086 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
1087 | perror("gethostname"); | |
1088 | exit(1); | |
1089 | } | |
1090 | ||
1091 | while ((opt = getopt(ac, av, | |
1092 | "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) { | |
1093 | switch (opt) { | |
1094 | case 'b': | |
1095 | bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr); | |
1096 | if (errstr) | |
1097 | fatal("Bits has bad value %s (%s)", | |
1098 | optarg, errstr); | |
1099 | break; | |
1100 | case 'F': | |
1101 | find_host = 1; | |
1102 | rr_hostname = optarg; | |
1103 | break; | |
1104 | case 'H': | |
1105 | hash_hosts = 1; | |
1106 | break; | |
1107 | case 'R': | |
1108 | delete_host = 1; | |
1109 | rr_hostname = optarg; | |
1110 | break; | |
1111 | case 'l': | |
1112 | print_fingerprint = 1; | |
1113 | break; | |
1114 | case 'B': | |
1115 | print_bubblebabble = 1; | |
1116 | break; | |
1117 | case 'p': | |
1118 | change_passphrase = 1; | |
1119 | break; | |
1120 | case 'c': | |
1121 | change_comment = 1; | |
1122 | break; | |
1123 | case 'f': | |
1124 | if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= | |
1125 | sizeof(identity_file)) | |
1126 | fatal("Identity filename too long"); | |
1127 | have_identity = 1; | |
1128 | break; | |
1129 | case 'g': | |
1130 | print_generic = 1; | |
1131 | break; | |
1132 | case 'P': | |
1133 | identity_passphrase = optarg; | |
1134 | break; | |
1135 | case 'N': | |
1136 | identity_new_passphrase = optarg; | |
1137 | break; | |
1138 | case 'C': | |
1139 | identity_comment = optarg; | |
1140 | break; | |
1141 | case 'q': | |
1142 | quiet = 1; | |
1143 | break; | |
1144 | case 'e': | |
1145 | case 'x': | |
1146 | /* export key */ | |
1147 | convert_to_ssh2 = 1; | |
1148 | break; | |
1149 | case 'i': | |
1150 | case 'X': | |
1151 | /* import key */ | |
1152 | convert_from_ssh2 = 1; | |
1153 | break; | |
1154 | case 'y': | |
1155 | print_public = 1; | |
1156 | break; | |
1157 | case 'd': | |
1158 | key_type_name = "dsa"; | |
1159 | break; | |
1160 | case 't': | |
1161 | key_type_name = optarg; | |
1162 | break; | |
1163 | case 'D': | |
1164 | download = 1; | |
1165 | /*FALLTHROUGH*/ | |
1166 | case 'U': | |
1167 | reader_id = optarg; | |
1168 | break; | |
1169 | case 'v': | |
1170 | if (log_level == SYSLOG_LEVEL_INFO) | |
1171 | log_level = SYSLOG_LEVEL_DEBUG1; | |
1172 | else { | |
1173 | if (log_level >= SYSLOG_LEVEL_DEBUG1 && | |
1174 | log_level < SYSLOG_LEVEL_DEBUG3) | |
1175 | log_level++; | |
1176 | } | |
1177 | break; | |
1178 | case 'r': | |
1179 | rr_hostname = optarg; | |
1180 | break; | |
1181 | case 'W': | |
1182 | generator_wanted = (u_int32_t)strtonum(optarg, 1, | |
1183 | UINT_MAX, &errstr); | |
1184 | if (errstr) | |
1185 | fatal("Desired generator has bad value: %s (%s)", | |
1186 | optarg, errstr); | |
1187 | break; | |
1188 | case 'a': | |
1189 | trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); | |
1190 | if (errstr) | |
1191 | fatal("Invalid number of trials: %s (%s)", | |
1192 | optarg, errstr); | |
1193 | break; | |
1194 | case 'M': | |
1195 | memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); | |
1196 | if (errstr) { | |
1197 | fatal("Memory limit is %s: %s", errstr, optarg); | |
1198 | } | |
1199 | break; | |
1200 | case 'G': | |
1201 | do_gen_candidates = 1; | |
1202 | if (strlcpy(out_file, optarg, sizeof(out_file)) >= | |
1203 | sizeof(out_file)) | |
1204 | fatal("Output filename too long"); | |
1205 | break; | |
1206 | case 'T': | |
1207 | do_screen_candidates = 1; | |
1208 | if (strlcpy(out_file, optarg, sizeof(out_file)) >= | |
1209 | sizeof(out_file)) | |
1210 | fatal("Output filename too long"); | |
1211 | break; | |
1212 | case 'S': | |
1213 | /* XXX - also compare length against bits */ | |
1214 | if (BN_hex2bn(&start, optarg) == 0) | |
1215 | fatal("Invalid start point."); | |
1216 | break; | |
1217 | case '?': | |
1218 | default: | |
1219 | usage(); | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | /* reinit */ | |
1224 | log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1); | |
1225 | ||
1226 | if (optind < ac) { | |
1227 | printf("Too many arguments.\n"); | |
1228 | usage(); | |
1229 | } | |
1230 | if (change_passphrase && change_comment) { | |
1231 | printf("Can only have one of -p and -c.\n"); | |
1232 | usage(); | |
1233 | } | |
1234 | if (delete_host || hash_hosts || find_host) | |
1235 | do_known_hosts(pw, rr_hostname); | |
1236 | if (print_fingerprint || print_bubblebabble) | |
1237 | do_fingerprint(pw); | |
1238 | if (change_passphrase) | |
1239 | do_change_passphrase(pw); | |
1240 | if (change_comment) | |
1241 | do_change_comment(pw); | |
1242 | if (convert_to_ssh2) | |
1243 | do_convert_to_ssh2(pw); | |
1244 | if (convert_from_ssh2) | |
1245 | do_convert_from_ssh2(pw); | |
1246 | if (print_public) | |
1247 | do_print_public(pw); | |
1248 | if (rr_hostname != NULL) { | |
1249 | unsigned int n = 0; | |
1250 | ||
1251 | if (have_identity) { | |
1252 | n = do_print_resource_record(pw, | |
1253 | identity_file, rr_hostname); | |
1254 | if (n == 0) { | |
1255 | perror(identity_file); | |
1256 | exit(1); | |
1257 | } | |
1258 | exit(0); | |
1259 | } else { | |
1260 | ||
1261 | n += do_print_resource_record(pw, | |
1262 | _PATH_HOST_RSA_KEY_FILE, rr_hostname); | |
1263 | n += do_print_resource_record(pw, | |
1264 | _PATH_HOST_DSA_KEY_FILE, rr_hostname); | |
1265 | ||
1266 | if (n == 0) | |
1267 | fatal("no keys found."); | |
1268 | exit(0); | |
1269 | } | |
1270 | } | |
1271 | if (reader_id != NULL) { | |
1272 | #ifdef SMARTCARD | |
1273 | if (download) | |
1274 | do_download(pw, reader_id); | |
1275 | else | |
1276 | do_upload(pw, reader_id); | |
1277 | #else /* SMARTCARD */ | |
1278 | fatal("no support for smartcards."); | |
1279 | #endif /* SMARTCARD */ | |
1280 | } | |
1281 | ||
1282 | if (do_gen_candidates) { | |
1283 | FILE *out = fopen(out_file, "w"); | |
1284 | ||
1285 | if (out == NULL) { | |
1286 | error("Couldn't open modulus candidate file \"%s\": %s", | |
1287 | out_file, strerror(errno)); | |
1288 | return (1); | |
1289 | } | |
1290 | if (bits == 0) | |
1291 | bits = DEFAULT_BITS; | |
1292 | if (gen_candidates(out, memory, bits, start) != 0) | |
1293 | fatal("modulus candidate generation failed"); | |
1294 | ||
1295 | return (0); | |
1296 | } | |
1297 | ||
1298 | if (do_screen_candidates) { | |
1299 | FILE *in; | |
1300 | FILE *out = fopen(out_file, "w"); | |
1301 | ||
1302 | if (have_identity && strcmp(identity_file, "-") != 0) { | |
1303 | if ((in = fopen(identity_file, "r")) == NULL) { | |
1304 | fatal("Couldn't open modulus candidate " | |
1305 | "file \"%s\": %s", identity_file, | |
1306 | strerror(errno)); | |
1307 | } | |
1308 | } else | |
1309 | in = stdin; | |
1310 | ||
1311 | if (out == NULL) { | |
1312 | fatal("Couldn't open moduli file \"%s\": %s", | |
1313 | out_file, strerror(errno)); | |
1314 | } | |
1315 | if (prime_test(in, out, trials, generator_wanted) != 0) | |
1316 | fatal("modulus screening failed"); | |
1317 | return (0); | |
1318 | } | |
1319 | ||
1320 | arc4random_stir(); | |
1321 | ||
1322 | if (key_type_name == NULL) | |
1323 | key_type_name = "rsa"; | |
1324 | ||
1325 | type = key_type_from_name(key_type_name); | |
1326 | if (type == KEY_UNSPEC) { | |
1327 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
1328 | exit(1); | |
1329 | } | |
1330 | if (bits == 0) | |
1331 | bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; | |
1332 | if (type == KEY_DSA && bits != 1024) | |
1333 | fatal("DSA keys must be 1024 bits"); | |
1334 | if (!quiet) | |
1335 | printf("Generating public/private %s key pair.\n", key_type_name); | |
1336 | private = key_generate(type, bits); | |
1337 | if (private == NULL) { | |
1338 | fprintf(stderr, "key_generate failed"); | |
1339 | exit(1); | |
1340 | } | |
1341 | public = key_from_private(private); | |
1342 | ||
1343 | if (!have_identity) | |
1344 | ask_filename(pw, "Enter file in which to save the key"); | |
1345 | ||
1346 | /* Create ~/.ssh directory if it doesn't already exist. */ | |
1347 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
1348 | if (strstr(identity_file, dotsshdir) != NULL && | |
1349 | stat(dotsshdir, &st) < 0) { | |
1350 | if (mkdir(dotsshdir, 0700) < 0) | |
1351 | error("Could not create directory '%s'.", dotsshdir); | |
1352 | else if (!quiet) | |
1353 | printf("Created directory '%s'.\n", dotsshdir); | |
1354 | } | |
1355 | /* If the file already exists, ask the user to confirm. */ | |
1356 | if (stat(identity_file, &st) >= 0) { | |
1357 | char yesno[3]; | |
1358 | printf("%s already exists.\n", identity_file); | |
1359 | printf("Overwrite (y/n)? "); | |
1360 | fflush(stdout); | |
1361 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
1362 | exit(1); | |
1363 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
1364 | exit(1); | |
1365 | } | |
1366 | /* Ask for a passphrase (twice). */ | |
1367 | if (identity_passphrase) | |
1368 | passphrase1 = xstrdup(identity_passphrase); | |
1369 | else if (identity_new_passphrase) | |
1370 | passphrase1 = xstrdup(identity_new_passphrase); | |
1371 | else { | |
1372 | passphrase_again: | |
1373 | passphrase1 = | |
1374 | read_passphrase("Enter passphrase (empty for no " | |
1375 | "passphrase): ", RP_ALLOW_STDIN); | |
1376 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
1377 | RP_ALLOW_STDIN); | |
1378 | if (strcmp(passphrase1, passphrase2) != 0) { | |
1379 | /* | |
1380 | * The passphrases do not match. Clear them and | |
1381 | * retry. | |
1382 | */ | |
1383 | memset(passphrase1, 0, strlen(passphrase1)); | |
1384 | memset(passphrase2, 0, strlen(passphrase2)); | |
1385 | xfree(passphrase1); | |
1386 | xfree(passphrase2); | |
1387 | printf("Passphrases do not match. Try again.\n"); | |
1388 | goto passphrase_again; | |
1389 | } | |
1390 | /* Clear the other copy of the passphrase. */ | |
1391 | memset(passphrase2, 0, strlen(passphrase2)); | |
1392 | xfree(passphrase2); | |
1393 | } | |
1394 | ||
1395 | if (identity_comment) { | |
1396 | strlcpy(comment, identity_comment, sizeof(comment)); | |
1397 | } else { | |
1398 | /* Create default commend field for the passphrase. */ | |
1399 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
1400 | } | |
1401 | ||
1402 | /* Save the key with the given passphrase and comment. */ | |
1403 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
1404 | printf("Saving the key failed: %s.\n", identity_file); | |
1405 | memset(passphrase1, 0, strlen(passphrase1)); | |
1406 | xfree(passphrase1); | |
1407 | exit(1); | |
1408 | } | |
1409 | /* Clear the passphrase. */ | |
1410 | memset(passphrase1, 0, strlen(passphrase1)); | |
1411 | xfree(passphrase1); | |
1412 | ||
1413 | /* Clear the private key and the random number generator. */ | |
1414 | key_free(private); | |
1415 | arc4random_stir(); | |
1416 | ||
1417 | if (!quiet) | |
1418 | printf("Your identification has been saved in %s.\n", identity_file); | |
1419 | ||
1420 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1421 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1422 | if (fd == -1) { | |
1423 | printf("Could not save your public key in %s\n", identity_file); | |
1424 | exit(1); | |
1425 | } | |
1426 | f = fdopen(fd, "w"); | |
1427 | if (f == NULL) { | |
1428 | printf("fdopen %s failed", identity_file); | |
1429 | exit(1); | |
1430 | } | |
1431 | if (!key_write(public, f)) | |
1432 | fprintf(stderr, "write key failed"); | |
1433 | fprintf(f, " %s\n", comment); | |
1434 | fclose(f); | |
1435 | ||
1436 | if (!quiet) { | |
1437 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
1438 | printf("Your public key has been saved in %s.\n", | |
1439 | identity_file); | |
1440 | printf("The key fingerprint is:\n"); | |
1441 | printf("%s %s\n", fp, comment); | |
1442 | xfree(fp); | |
1443 | } | |
1444 | ||
1445 | key_free(public); | |
1446 | exit(0); | |
1447 | } |