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1 | /* $OpenBSD: ssh-keygen.c,v 1.175 2009/08/27 17:33:49 djm 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 | #include "openbsd-compat/openssl-compat.h" | |
25 | ||
26 | #include <errno.h> | |
27 | #include <fcntl.h> | |
28 | #include <netdb.h> | |
29 | #ifdef HAVE_PATHS_H | |
30 | # include <paths.h> | |
31 | #endif | |
32 | #include <pwd.h> | |
33 | #include <stdarg.h> | |
34 | #include <stdio.h> | |
35 | #include <stdlib.h> | |
36 | #include <string.h> | |
37 | #include <unistd.h> | |
38 | ||
39 | #include "xmalloc.h" | |
40 | #include "key.h" | |
41 | #include "rsa.h" | |
42 | #include "authfile.h" | |
43 | #include "uuencode.h" | |
44 | #include "buffer.h" | |
45 | #include "pathnames.h" | |
46 | #include "log.h" | |
47 | #include "misc.h" | |
48 | #include "match.h" | |
49 | #include "hostfile.h" | |
50 | #include "dns.h" | |
51 | ||
52 | #ifdef SMARTCARD | |
53 | #include "scard.h" | |
54 | #endif | |
55 | ||
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 | |
59 | u_int32_t bits = 0; | |
60 | ||
61 | /* | |
62 | * Flag indicating that we just want to change the passphrase. This can be | |
63 | * set on the command line. | |
64 | */ | |
65 | int change_passphrase = 0; | |
66 | ||
67 | /* | |
68 | * Flag indicating that we just want to change the comment. This can be set | |
69 | * on the command line. | |
70 | */ | |
71 | int change_comment = 0; | |
72 | ||
73 | int quiet = 0; | |
74 | ||
75 | int log_level = SYSLOG_LEVEL_INFO; | |
76 | ||
77 | /* Flag indicating that we want to hash a known_hosts file */ | |
78 | int hash_hosts = 0; | |
79 | /* Flag indicating that we want lookup a host in known_hosts file */ | |
80 | int find_host = 0; | |
81 | /* Flag indicating that we want to delete a host from a known_hosts file */ | |
82 | int delete_host = 0; | |
83 | ||
84 | /* Flag indicating that we just want to see the key fingerprint */ | |
85 | int print_fingerprint = 0; | |
86 | int print_bubblebabble = 0; | |
87 | ||
88 | /* The identity file name, given on the command line or entered by the user. */ | |
89 | char identity_file[1024]; | |
90 | int have_identity = 0; | |
91 | ||
92 | /* This is set to the passphrase if given on the command line. */ | |
93 | char *identity_passphrase = NULL; | |
94 | ||
95 | /* This is set to the new passphrase if given on the command line. */ | |
96 | char *identity_new_passphrase = NULL; | |
97 | ||
98 | /* This is set to the new comment if given on the command line. */ | |
99 | char *identity_comment = NULL; | |
100 | ||
101 | /* Dump public key file in format used by real and the original SSH 2 */ | |
102 | int convert_to_ssh2 = 0; | |
103 | int convert_from_ssh2 = 0; | |
104 | int print_public = 0; | |
105 | int print_generic = 0; | |
106 | ||
107 | char *key_type_name = NULL; | |
108 | ||
109 | /* argv0 */ | |
110 | extern char *__progname; | |
111 | ||
112 | char hostname[MAXHOSTNAMELEN]; | |
113 | ||
114 | /* moduli.c */ | |
115 | int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *); | |
116 | int prime_test(FILE *, FILE *, u_int32_t, u_int32_t); | |
117 | ||
118 | static void | |
119 | ask_filename(struct passwd *pw, const char *prompt) | |
120 | { | |
121 | char buf[1024]; | |
122 | char *name = NULL; | |
123 | ||
124 | if (key_type_name == NULL) | |
125 | name = _PATH_SSH_CLIENT_ID_RSA; | |
126 | else { | |
127 | switch (key_type_from_name(key_type_name)) { | |
128 | case KEY_RSA1: | |
129 | name = _PATH_SSH_CLIENT_IDENTITY; | |
130 | break; | |
131 | case KEY_DSA: | |
132 | name = _PATH_SSH_CLIENT_ID_DSA; | |
133 | break; | |
134 | case KEY_RSA: | |
135 | name = _PATH_SSH_CLIENT_ID_RSA; | |
136 | break; | |
137 | default: | |
138 | fprintf(stderr, "bad key type\n"); | |
139 | exit(1); | |
140 | break; | |
141 | } | |
142 | } | |
143 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); | |
144 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
145 | if (fgets(buf, sizeof(buf), stdin) == NULL) | |
146 | exit(1); | |
147 | buf[strcspn(buf, "\n")] = '\0'; | |
148 | if (strcmp(buf, "") != 0) | |
149 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
150 | have_identity = 1; | |
151 | } | |
152 | ||
153 | static Key * | |
154 | load_identity(char *filename) | |
155 | { | |
156 | char *pass; | |
157 | Key *prv; | |
158 | ||
159 | prv = key_load_private(filename, "", NULL); | |
160 | if (prv == NULL) { | |
161 | if (identity_passphrase) | |
162 | pass = xstrdup(identity_passphrase); | |
163 | else | |
164 | pass = read_passphrase("Enter passphrase: ", | |
165 | RP_ALLOW_STDIN); | |
166 | prv = key_load_private(filename, pass, NULL); | |
167 | memset(pass, 0, strlen(pass)); | |
168 | xfree(pass); | |
169 | } | |
170 | return prv; | |
171 | } | |
172 | ||
173 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
174 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" | |
175 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" | |
176 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
177 | ||
178 | static void | |
179 | do_convert_to_ssh2(struct passwd *pw) | |
180 | { | |
181 | Key *k; | |
182 | u_int len; | |
183 | u_char *blob; | |
184 | struct stat st; | |
185 | ||
186 | if (!have_identity) | |
187 | ask_filename(pw, "Enter file in which the key is"); | |
188 | if (stat(identity_file, &st) < 0) { | |
189 | perror(identity_file); | |
190 | exit(1); | |
191 | } | |
192 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
193 | if ((k = load_identity(identity_file)) == NULL) { | |
194 | fprintf(stderr, "load failed\n"); | |
195 | exit(1); | |
196 | } | |
197 | } | |
198 | if (k->type == KEY_RSA1) { | |
199 | fprintf(stderr, "version 1 keys are not supported\n"); | |
200 | exit(1); | |
201 | } | |
202 | if (key_to_blob(k, &blob, &len) <= 0) { | |
203 | fprintf(stderr, "key_to_blob failed\n"); | |
204 | exit(1); | |
205 | } | |
206 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
207 | fprintf(stdout, | |
208 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", | |
209 | key_size(k), key_type(k), | |
210 | pw->pw_name, hostname); | |
211 | dump_base64(stdout, blob, len); | |
212 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
213 | key_free(k); | |
214 | xfree(blob); | |
215 | exit(0); | |
216 | } | |
217 | ||
218 | static void | |
219 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
220 | { | |
221 | u_int bignum_bits = buffer_get_int(b); | |
222 | u_int bytes = (bignum_bits + 7) / 8; | |
223 | ||
224 | if (buffer_len(b) < bytes) | |
225 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
226 | "need %d have %d", bytes, buffer_len(b)); | |
227 | if (BN_bin2bn(buffer_ptr(b), bytes, value) == NULL) | |
228 | fatal("buffer_get_bignum_bits: BN_bin2bn failed"); | |
229 | buffer_consume(b, bytes); | |
230 | } | |
231 | ||
232 | static Key * | |
233 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) | |
234 | { | |
235 | Buffer b; | |
236 | Key *key = NULL; | |
237 | char *type, *cipher; | |
238 | u_char *sig, data[] = "abcde12345"; | |
239 | int magic, rlen, ktype, i1, i2, i3, i4; | |
240 | u_int slen; | |
241 | u_long e; | |
242 | ||
243 | buffer_init(&b); | |
244 | buffer_append(&b, blob, blen); | |
245 | ||
246 | magic = buffer_get_int(&b); | |
247 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
248 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
249 | buffer_free(&b); | |
250 | return NULL; | |
251 | } | |
252 | i1 = buffer_get_int(&b); | |
253 | type = buffer_get_string(&b, NULL); | |
254 | cipher = buffer_get_string(&b, NULL); | |
255 | i2 = buffer_get_int(&b); | |
256 | i3 = buffer_get_int(&b); | |
257 | i4 = buffer_get_int(&b); | |
258 | debug("ignore (%d %d %d %d)", i1, i2, i3, i4); | |
259 | if (strcmp(cipher, "none") != 0) { | |
260 | error("unsupported cipher %s", cipher); | |
261 | xfree(cipher); | |
262 | buffer_free(&b); | |
263 | xfree(type); | |
264 | return NULL; | |
265 | } | |
266 | xfree(cipher); | |
267 | ||
268 | if (strstr(type, "dsa")) { | |
269 | ktype = KEY_DSA; | |
270 | } else if (strstr(type, "rsa")) { | |
271 | ktype = KEY_RSA; | |
272 | } else { | |
273 | buffer_free(&b); | |
274 | xfree(type); | |
275 | return NULL; | |
276 | } | |
277 | key = key_new_private(ktype); | |
278 | xfree(type); | |
279 | ||
280 | switch (key->type) { | |
281 | case KEY_DSA: | |
282 | buffer_get_bignum_bits(&b, key->dsa->p); | |
283 | buffer_get_bignum_bits(&b, key->dsa->g); | |
284 | buffer_get_bignum_bits(&b, key->dsa->q); | |
285 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
286 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
287 | break; | |
288 | case KEY_RSA: | |
289 | e = buffer_get_char(&b); | |
290 | debug("e %lx", e); | |
291 | if (e < 30) { | |
292 | e <<= 8; | |
293 | e += buffer_get_char(&b); | |
294 | debug("e %lx", e); | |
295 | e <<= 8; | |
296 | e += buffer_get_char(&b); | |
297 | debug("e %lx", e); | |
298 | } | |
299 | if (!BN_set_word(key->rsa->e, e)) { | |
300 | buffer_free(&b); | |
301 | key_free(key); | |
302 | return NULL; | |
303 | } | |
304 | buffer_get_bignum_bits(&b, key->rsa->d); | |
305 | buffer_get_bignum_bits(&b, key->rsa->n); | |
306 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
307 | buffer_get_bignum_bits(&b, key->rsa->q); | |
308 | buffer_get_bignum_bits(&b, key->rsa->p); | |
309 | rsa_generate_additional_parameters(key->rsa); | |
310 | break; | |
311 | } | |
312 | rlen = buffer_len(&b); | |
313 | if (rlen != 0) | |
314 | error("do_convert_private_ssh2_from_blob: " | |
315 | "remaining bytes in key blob %d", rlen); | |
316 | buffer_free(&b); | |
317 | ||
318 | /* try the key */ | |
319 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
320 | key_verify(key, sig, slen, data, sizeof(data)); | |
321 | xfree(sig); | |
322 | return key; | |
323 | } | |
324 | ||
325 | static int | |
326 | get_line(FILE *fp, char *line, size_t len) | |
327 | { | |
328 | int c; | |
329 | size_t pos = 0; | |
330 | ||
331 | line[0] = '\0'; | |
332 | while ((c = fgetc(fp)) != EOF) { | |
333 | if (pos >= len - 1) { | |
334 | fprintf(stderr, "input line too long.\n"); | |
335 | exit(1); | |
336 | } | |
337 | switch (c) { | |
338 | case '\r': | |
339 | c = fgetc(fp); | |
340 | if (c != EOF && c != '\n' && ungetc(c, fp) == EOF) { | |
341 | fprintf(stderr, "unget: %s\n", strerror(errno)); | |
342 | exit(1); | |
343 | } | |
344 | return pos; | |
345 | case '\n': | |
346 | return pos; | |
347 | } | |
348 | line[pos++] = c; | |
349 | line[pos] = '\0'; | |
350 | } | |
351 | /* We reached EOF */ | |
352 | return -1; | |
353 | } | |
354 | ||
355 | static void | |
356 | do_convert_from_ssh2(struct passwd *pw) | |
357 | { | |
358 | Key *k; | |
359 | int blen; | |
360 | u_int len; | |
361 | char line[1024]; | |
362 | u_char blob[8096]; | |
363 | char encoded[8096]; | |
364 | struct stat st; | |
365 | int escaped = 0, private = 0, ok; | |
366 | FILE *fp; | |
367 | ||
368 | if (!have_identity) | |
369 | ask_filename(pw, "Enter file in which the key is"); | |
370 | if (stat(identity_file, &st) < 0) { | |
371 | perror(identity_file); | |
372 | exit(1); | |
373 | } | |
374 | fp = fopen(identity_file, "r"); | |
375 | if (fp == NULL) { | |
376 | perror(identity_file); | |
377 | exit(1); | |
378 | } | |
379 | encoded[0] = '\0'; | |
380 | while ((blen = get_line(fp, line, sizeof(line))) != -1) { | |
381 | if (line[blen - 1] == '\\') | |
382 | escaped++; | |
383 | if (strncmp(line, "----", 4) == 0 || | |
384 | strstr(line, ": ") != NULL) { | |
385 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
386 | private = 1; | |
387 | if (strstr(line, " END ") != NULL) { | |
388 | break; | |
389 | } | |
390 | /* fprintf(stderr, "ignore: %s", line); */ | |
391 | continue; | |
392 | } | |
393 | if (escaped) { | |
394 | escaped--; | |
395 | /* fprintf(stderr, "escaped: %s", line); */ | |
396 | continue; | |
397 | } | |
398 | strlcat(encoded, line, sizeof(encoded)); | |
399 | } | |
400 | len = strlen(encoded); | |
401 | if (((len % 4) == 3) && | |
402 | (encoded[len-1] == '=') && | |
403 | (encoded[len-2] == '=') && | |
404 | (encoded[len-3] == '=')) | |
405 | encoded[len-3] = '\0'; | |
406 | blen = uudecode(encoded, blob, sizeof(blob)); | |
407 | if (blen < 0) { | |
408 | fprintf(stderr, "uudecode failed.\n"); | |
409 | exit(1); | |
410 | } | |
411 | k = private ? | |
412 | do_convert_private_ssh2_from_blob(blob, blen) : | |
413 | key_from_blob(blob, blen); | |
414 | if (k == NULL) { | |
415 | fprintf(stderr, "decode blob failed.\n"); | |
416 | exit(1); | |
417 | } | |
418 | ok = private ? | |
419 | (k->type == KEY_DSA ? | |
420 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
421 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
422 | key_write(k, stdout); | |
423 | if (!ok) { | |
424 | fprintf(stderr, "key write failed\n"); | |
425 | exit(1); | |
426 | } | |
427 | key_free(k); | |
428 | if (!private) | |
429 | fprintf(stdout, "\n"); | |
430 | fclose(fp); | |
431 | exit(0); | |
432 | } | |
433 | ||
434 | static void | |
435 | do_print_public(struct passwd *pw) | |
436 | { | |
437 | Key *prv; | |
438 | struct stat st; | |
439 | ||
440 | if (!have_identity) | |
441 | ask_filename(pw, "Enter file in which the key is"); | |
442 | if (stat(identity_file, &st) < 0) { | |
443 | perror(identity_file); | |
444 | exit(1); | |
445 | } | |
446 | prv = load_identity(identity_file); | |
447 | if (prv == NULL) { | |
448 | fprintf(stderr, "load failed\n"); | |
449 | exit(1); | |
450 | } | |
451 | if (!key_write(prv, stdout)) | |
452 | fprintf(stderr, "key_write failed"); | |
453 | key_free(prv); | |
454 | fprintf(stdout, "\n"); | |
455 | exit(0); | |
456 | } | |
457 | ||
458 | #ifdef SMARTCARD | |
459 | static void | |
460 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
461 | { | |
462 | Key *prv = NULL; | |
463 | struct stat st; | |
464 | int ret; | |
465 | ||
466 | if (!have_identity) | |
467 | ask_filename(pw, "Enter file in which the key is"); | |
468 | if (stat(identity_file, &st) < 0) { | |
469 | perror(identity_file); | |
470 | exit(1); | |
471 | } | |
472 | prv = load_identity(identity_file); | |
473 | if (prv == NULL) { | |
474 | error("load failed"); | |
475 | exit(1); | |
476 | } | |
477 | ret = sc_put_key(prv, sc_reader_id); | |
478 | key_free(prv); | |
479 | if (ret < 0) | |
480 | exit(1); | |
481 | logit("loading key done"); | |
482 | exit(0); | |
483 | } | |
484 | ||
485 | static void | |
486 | do_download(struct passwd *pw, const char *sc_reader_id) | |
487 | { | |
488 | Key **keys = NULL; | |
489 | int i; | |
490 | ||
491 | keys = sc_get_keys(sc_reader_id, NULL); | |
492 | if (keys == NULL) | |
493 | fatal("cannot read public key from smartcard"); | |
494 | for (i = 0; keys[i]; i++) { | |
495 | key_write(keys[i], stdout); | |
496 | key_free(keys[i]); | |
497 | fprintf(stdout, "\n"); | |
498 | } | |
499 | xfree(keys); | |
500 | exit(0); | |
501 | } | |
502 | #endif /* SMARTCARD */ | |
503 | ||
504 | static void | |
505 | do_fingerprint(struct passwd *pw) | |
506 | { | |
507 | FILE *f; | |
508 | Key *public; | |
509 | char *comment = NULL, *cp, *ep, line[16*1024], *fp, *ra; | |
510 | int i, skip = 0, num = 0, invalid = 1; | |
511 | enum fp_rep rep; | |
512 | enum fp_type fptype; | |
513 | struct stat st; | |
514 | ||
515 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
516 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
517 | ||
518 | if (!have_identity) | |
519 | ask_filename(pw, "Enter file in which the key is"); | |
520 | if (stat(identity_file, &st) < 0) { | |
521 | perror(identity_file); | |
522 | exit(1); | |
523 | } | |
524 | public = key_load_public(identity_file, &comment); | |
525 | if (public != NULL) { | |
526 | fp = key_fingerprint(public, fptype, rep); | |
527 | ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); | |
528 | printf("%u %s %s (%s)\n", key_size(public), fp, comment, | |
529 | key_type(public)); | |
530 | if (log_level >= SYSLOG_LEVEL_VERBOSE) | |
531 | printf("%s\n", ra); | |
532 | key_free(public); | |
533 | xfree(comment); | |
534 | xfree(ra); | |
535 | xfree(fp); | |
536 | exit(0); | |
537 | } | |
538 | if (comment) { | |
539 | xfree(comment); | |
540 | comment = NULL; | |
541 | } | |
542 | ||
543 | f = fopen(identity_file, "r"); | |
544 | if (f != NULL) { | |
545 | while (fgets(line, sizeof(line), f)) { | |
546 | if ((cp = strchr(line, '\n')) == NULL) { | |
547 | error("line %d too long: %.40s...", | |
548 | num + 1, line); | |
549 | skip = 1; | |
550 | continue; | |
551 | } | |
552 | num++; | |
553 | if (skip) { | |
554 | skip = 0; | |
555 | continue; | |
556 | } | |
557 | *cp = '\0'; | |
558 | ||
559 | /* Skip leading whitespace, empty and comment lines. */ | |
560 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
561 | ; | |
562 | if (!*cp || *cp == '\n' || *cp == '#') | |
563 | continue; | |
564 | i = strtol(cp, &ep, 10); | |
565 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
566 | int quoted = 0; | |
567 | comment = cp; | |
568 | for (; *cp && (quoted || (*cp != ' ' && | |
569 | *cp != '\t')); cp++) { | |
570 | if (*cp == '\\' && cp[1] == '"') | |
571 | cp++; /* Skip both */ | |
572 | else if (*cp == '"') | |
573 | quoted = !quoted; | |
574 | } | |
575 | if (!*cp) | |
576 | continue; | |
577 | *cp++ = '\0'; | |
578 | } | |
579 | ep = cp; | |
580 | public = key_new(KEY_RSA1); | |
581 | if (key_read(public, &cp) != 1) { | |
582 | cp = ep; | |
583 | key_free(public); | |
584 | public = key_new(KEY_UNSPEC); | |
585 | if (key_read(public, &cp) != 1) { | |
586 | key_free(public); | |
587 | continue; | |
588 | } | |
589 | } | |
590 | comment = *cp ? cp : comment; | |
591 | fp = key_fingerprint(public, fptype, rep); | |
592 | ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); | |
593 | printf("%u %s %s (%s)\n", key_size(public), fp, | |
594 | comment ? comment : "no comment", key_type(public)); | |
595 | if (log_level >= SYSLOG_LEVEL_VERBOSE) | |
596 | printf("%s\n", ra); | |
597 | xfree(ra); | |
598 | xfree(fp); | |
599 | key_free(public); | |
600 | invalid = 0; | |
601 | } | |
602 | fclose(f); | |
603 | } | |
604 | if (invalid) { | |
605 | printf("%s is not a public key file.\n", identity_file); | |
606 | exit(1); | |
607 | } | |
608 | exit(0); | |
609 | } | |
610 | ||
611 | static void | |
612 | print_host(FILE *f, const char *name, Key *public, int hash) | |
613 | { | |
614 | if (print_fingerprint) { | |
615 | enum fp_rep rep; | |
616 | enum fp_type fptype; | |
617 | char *fp, *ra; | |
618 | ||
619 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
620 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
621 | fp = key_fingerprint(public, fptype, rep); | |
622 | ra = key_fingerprint(public, SSH_FP_MD5, SSH_FP_RANDOMART); | |
623 | printf("%u %s %s (%s)\n", key_size(public), fp, name, | |
624 | key_type(public)); | |
625 | if (log_level >= SYSLOG_LEVEL_VERBOSE) | |
626 | printf("%s\n", ra); | |
627 | xfree(ra); | |
628 | xfree(fp); | |
629 | } else { | |
630 | if (hash && (name = host_hash(name, NULL, 0)) == NULL) | |
631 | fatal("hash_host failed"); | |
632 | fprintf(f, "%s ", name); | |
633 | if (!key_write(public, f)) | |
634 | fatal("key_write failed"); | |
635 | fprintf(f, "\n"); | |
636 | } | |
637 | } | |
638 | ||
639 | static void | |
640 | do_known_hosts(struct passwd *pw, const char *name) | |
641 | { | |
642 | FILE *in, *out = stdout; | |
643 | Key *public; | |
644 | char *cp, *cp2, *kp, *kp2; | |
645 | char line[16*1024], tmp[MAXPATHLEN], old[MAXPATHLEN]; | |
646 | int c, skip = 0, inplace = 0, num = 0, invalid = 0, has_unhashed = 0; | |
647 | ||
648 | if (!have_identity) { | |
649 | cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid); | |
650 | if (strlcpy(identity_file, cp, sizeof(identity_file)) >= | |
651 | sizeof(identity_file)) | |
652 | fatal("Specified known hosts path too long"); | |
653 | xfree(cp); | |
654 | have_identity = 1; | |
655 | } | |
656 | if ((in = fopen(identity_file, "r")) == NULL) | |
657 | fatal("fopen: %s", strerror(errno)); | |
658 | ||
659 | /* | |
660 | * Find hosts goes to stdout, hash and deletions happen in-place | |
661 | * A corner case is ssh-keygen -HF foo, which should go to stdout | |
662 | */ | |
663 | if (!find_host && (hash_hosts || delete_host)) { | |
664 | if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) || | |
665 | strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) || | |
666 | strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) || | |
667 | strlcat(old, ".old", sizeof(old)) >= sizeof(old)) | |
668 | fatal("known_hosts path too long"); | |
669 | umask(077); | |
670 | if ((c = mkstemp(tmp)) == -1) | |
671 | fatal("mkstemp: %s", strerror(errno)); | |
672 | if ((out = fdopen(c, "w")) == NULL) { | |
673 | c = errno; | |
674 | unlink(tmp); | |
675 | fatal("fdopen: %s", strerror(c)); | |
676 | } | |
677 | inplace = 1; | |
678 | } | |
679 | ||
680 | while (fgets(line, sizeof(line), in)) { | |
681 | if ((cp = strchr(line, '\n')) == NULL) { | |
682 | error("line %d too long: %.40s...", num + 1, line); | |
683 | skip = 1; | |
684 | invalid = 1; | |
685 | continue; | |
686 | } | |
687 | num++; | |
688 | if (skip) { | |
689 | skip = 0; | |
690 | continue; | |
691 | } | |
692 | *cp = '\0'; | |
693 | ||
694 | /* Skip leading whitespace, empty and comment lines. */ | |
695 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
696 | ; | |
697 | if (!*cp || *cp == '\n' || *cp == '#') { | |
698 | if (inplace) | |
699 | fprintf(out, "%s\n", cp); | |
700 | continue; | |
701 | } | |
702 | /* Find the end of the host name portion. */ | |
703 | for (kp = cp; *kp && *kp != ' ' && *kp != '\t'; kp++) | |
704 | ; | |
705 | if (*kp == '\0' || *(kp + 1) == '\0') { | |
706 | error("line %d missing key: %.40s...", | |
707 | num, line); | |
708 | invalid = 1; | |
709 | continue; | |
710 | } | |
711 | *kp++ = '\0'; | |
712 | kp2 = kp; | |
713 | ||
714 | public = key_new(KEY_RSA1); | |
715 | if (key_read(public, &kp) != 1) { | |
716 | kp = kp2; | |
717 | key_free(public); | |
718 | public = key_new(KEY_UNSPEC); | |
719 | if (key_read(public, &kp) != 1) { | |
720 | error("line %d invalid key: %.40s...", | |
721 | num, line); | |
722 | key_free(public); | |
723 | invalid = 1; | |
724 | continue; | |
725 | } | |
726 | } | |
727 | ||
728 | if (*cp == HASH_DELIM) { | |
729 | if (find_host || delete_host) { | |
730 | cp2 = host_hash(name, cp, strlen(cp)); | |
731 | if (cp2 == NULL) { | |
732 | error("line %d: invalid hashed " | |
733 | "name: %.64s...", num, line); | |
734 | invalid = 1; | |
735 | continue; | |
736 | } | |
737 | c = (strcmp(cp2, cp) == 0); | |
738 | if (find_host && c) { | |
739 | printf("# Host %s found: " | |
740 | "line %d type %s\n", name, | |
741 | num, key_type(public)); | |
742 | print_host(out, cp, public, 0); | |
743 | } | |
744 | if (delete_host && !c) | |
745 | print_host(out, cp, public, 0); | |
746 | } else if (hash_hosts) | |
747 | print_host(out, cp, public, 0); | |
748 | } else { | |
749 | if (find_host || delete_host) { | |
750 | c = (match_hostname(name, cp, | |
751 | strlen(cp)) == 1); | |
752 | if (find_host && c) { | |
753 | printf("# Host %s found: " | |
754 | "line %d type %s\n", name, | |
755 | num, key_type(public)); | |
756 | print_host(out, name, public, | |
757 | hash_hosts); | |
758 | } | |
759 | if (delete_host && !c) | |
760 | print_host(out, cp, public, 0); | |
761 | } else if (hash_hosts) { | |
762 | for (cp2 = strsep(&cp, ","); | |
763 | cp2 != NULL && *cp2 != '\0'; | |
764 | cp2 = strsep(&cp, ",")) { | |
765 | if (strcspn(cp2, "*?!") != strlen(cp2)) | |
766 | fprintf(stderr, "Warning: " | |
767 | "ignoring host name with " | |
768 | "metacharacters: %.64s\n", | |
769 | cp2); | |
770 | else | |
771 | print_host(out, cp2, public, 1); | |
772 | } | |
773 | has_unhashed = 1; | |
774 | } | |
775 | } | |
776 | key_free(public); | |
777 | } | |
778 | fclose(in); | |
779 | ||
780 | if (invalid) { | |
781 | fprintf(stderr, "%s is not a valid known_hosts file.\n", | |
782 | identity_file); | |
783 | if (inplace) { | |
784 | fprintf(stderr, "Not replacing existing known_hosts " | |
785 | "file because of errors\n"); | |
786 | fclose(out); | |
787 | unlink(tmp); | |
788 | } | |
789 | exit(1); | |
790 | } | |
791 | ||
792 | if (inplace) { | |
793 | fclose(out); | |
794 | ||
795 | /* Backup existing file */ | |
796 | if (unlink(old) == -1 && errno != ENOENT) | |
797 | fatal("unlink %.100s: %s", old, strerror(errno)); | |
798 | if (link(identity_file, old) == -1) | |
799 | fatal("link %.100s to %.100s: %s", identity_file, old, | |
800 | strerror(errno)); | |
801 | /* Move new one into place */ | |
802 | if (rename(tmp, identity_file) == -1) { | |
803 | error("rename\"%s\" to \"%s\": %s", tmp, identity_file, | |
804 | strerror(errno)); | |
805 | unlink(tmp); | |
806 | unlink(old); | |
807 | exit(1); | |
808 | } | |
809 | ||
810 | fprintf(stderr, "%s updated.\n", identity_file); | |
811 | fprintf(stderr, "Original contents retained as %s\n", old); | |
812 | if (has_unhashed) { | |
813 | fprintf(stderr, "WARNING: %s contains unhashed " | |
814 | "entries\n", old); | |
815 | fprintf(stderr, "Delete this file to ensure privacy " | |
816 | "of hostnames\n"); | |
817 | } | |
818 | } | |
819 | ||
820 | exit(0); | |
821 | } | |
822 | ||
823 | /* | |
824 | * Perform changing a passphrase. The argument is the passwd structure | |
825 | * for the current user. | |
826 | */ | |
827 | static void | |
828 | do_change_passphrase(struct passwd *pw) | |
829 | { | |
830 | char *comment; | |
831 | char *old_passphrase, *passphrase1, *passphrase2; | |
832 | struct stat st; | |
833 | Key *private; | |
834 | ||
835 | if (!have_identity) | |
836 | ask_filename(pw, "Enter file in which the key is"); | |
837 | if (stat(identity_file, &st) < 0) { | |
838 | perror(identity_file); | |
839 | exit(1); | |
840 | } | |
841 | /* Try to load the file with empty passphrase. */ | |
842 | private = key_load_private(identity_file, "", &comment); | |
843 | if (private == NULL) { | |
844 | if (identity_passphrase) | |
845 | old_passphrase = xstrdup(identity_passphrase); | |
846 | else | |
847 | old_passphrase = | |
848 | read_passphrase("Enter old passphrase: ", | |
849 | RP_ALLOW_STDIN); | |
850 | private = key_load_private(identity_file, old_passphrase, | |
851 | &comment); | |
852 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
853 | xfree(old_passphrase); | |
854 | if (private == NULL) { | |
855 | printf("Bad passphrase.\n"); | |
856 | exit(1); | |
857 | } | |
858 | } | |
859 | printf("Key has comment '%s'\n", comment); | |
860 | ||
861 | /* Ask the new passphrase (twice). */ | |
862 | if (identity_new_passphrase) { | |
863 | passphrase1 = xstrdup(identity_new_passphrase); | |
864 | passphrase2 = NULL; | |
865 | } else { | |
866 | passphrase1 = | |
867 | read_passphrase("Enter new passphrase (empty for no " | |
868 | "passphrase): ", RP_ALLOW_STDIN); | |
869 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
870 | RP_ALLOW_STDIN); | |
871 | ||
872 | /* Verify that they are the same. */ | |
873 | if (strcmp(passphrase1, passphrase2) != 0) { | |
874 | memset(passphrase1, 0, strlen(passphrase1)); | |
875 | memset(passphrase2, 0, strlen(passphrase2)); | |
876 | xfree(passphrase1); | |
877 | xfree(passphrase2); | |
878 | printf("Pass phrases do not match. Try again.\n"); | |
879 | exit(1); | |
880 | } | |
881 | /* Destroy the other copy. */ | |
882 | memset(passphrase2, 0, strlen(passphrase2)); | |
883 | xfree(passphrase2); | |
884 | } | |
885 | ||
886 | /* Save the file using the new passphrase. */ | |
887 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
888 | printf("Saving the key failed: %s.\n", identity_file); | |
889 | memset(passphrase1, 0, strlen(passphrase1)); | |
890 | xfree(passphrase1); | |
891 | key_free(private); | |
892 | xfree(comment); | |
893 | exit(1); | |
894 | } | |
895 | /* Destroy the passphrase and the copy of the key in memory. */ | |
896 | memset(passphrase1, 0, strlen(passphrase1)); | |
897 | xfree(passphrase1); | |
898 | key_free(private); /* Destroys contents */ | |
899 | xfree(comment); | |
900 | ||
901 | printf("Your identification has been saved with the new passphrase.\n"); | |
902 | exit(0); | |
903 | } | |
904 | ||
905 | /* | |
906 | * Print the SSHFP RR. | |
907 | */ | |
908 | static int | |
909 | do_print_resource_record(struct passwd *pw, char *fname, char *hname) | |
910 | { | |
911 | Key *public; | |
912 | char *comment = NULL; | |
913 | struct stat st; | |
914 | ||
915 | if (fname == NULL) | |
916 | ask_filename(pw, "Enter file in which the key is"); | |
917 | if (stat(fname, &st) < 0) { | |
918 | if (errno == ENOENT) | |
919 | return 0; | |
920 | perror(fname); | |
921 | exit(1); | |
922 | } | |
923 | public = key_load_public(fname, &comment); | |
924 | if (public != NULL) { | |
925 | export_dns_rr(hname, public, stdout, print_generic); | |
926 | key_free(public); | |
927 | xfree(comment); | |
928 | return 1; | |
929 | } | |
930 | if (comment) | |
931 | xfree(comment); | |
932 | ||
933 | printf("failed to read v2 public key from %s.\n", fname); | |
934 | exit(1); | |
935 | } | |
936 | ||
937 | /* | |
938 | * Change the comment of a private key file. | |
939 | */ | |
940 | static void | |
941 | do_change_comment(struct passwd *pw) | |
942 | { | |
943 | char new_comment[1024], *comment, *passphrase; | |
944 | Key *private; | |
945 | Key *public; | |
946 | struct stat st; | |
947 | FILE *f; | |
948 | int fd; | |
949 | ||
950 | if (!have_identity) | |
951 | ask_filename(pw, "Enter file in which the key is"); | |
952 | if (stat(identity_file, &st) < 0) { | |
953 | perror(identity_file); | |
954 | exit(1); | |
955 | } | |
956 | private = key_load_private(identity_file, "", &comment); | |
957 | if (private == NULL) { | |
958 | if (identity_passphrase) | |
959 | passphrase = xstrdup(identity_passphrase); | |
960 | else if (identity_new_passphrase) | |
961 | passphrase = xstrdup(identity_new_passphrase); | |
962 | else | |
963 | passphrase = read_passphrase("Enter passphrase: ", | |
964 | RP_ALLOW_STDIN); | |
965 | /* Try to load using the passphrase. */ | |
966 | private = key_load_private(identity_file, passphrase, &comment); | |
967 | if (private == NULL) { | |
968 | memset(passphrase, 0, strlen(passphrase)); | |
969 | xfree(passphrase); | |
970 | printf("Bad passphrase.\n"); | |
971 | exit(1); | |
972 | } | |
973 | } else { | |
974 | passphrase = xstrdup(""); | |
975 | } | |
976 | if (private->type != KEY_RSA1) { | |
977 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
978 | key_free(private); | |
979 | exit(1); | |
980 | } | |
981 | printf("Key now has comment '%s'\n", comment); | |
982 | ||
983 | if (identity_comment) { | |
984 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
985 | } else { | |
986 | printf("Enter new comment: "); | |
987 | fflush(stdout); | |
988 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
989 | memset(passphrase, 0, strlen(passphrase)); | |
990 | key_free(private); | |
991 | exit(1); | |
992 | } | |
993 | new_comment[strcspn(new_comment, "\n")] = '\0'; | |
994 | } | |
995 | ||
996 | /* Save the file using the new passphrase. */ | |
997 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
998 | printf("Saving the key failed: %s.\n", identity_file); | |
999 | memset(passphrase, 0, strlen(passphrase)); | |
1000 | xfree(passphrase); | |
1001 | key_free(private); | |
1002 | xfree(comment); | |
1003 | exit(1); | |
1004 | } | |
1005 | memset(passphrase, 0, strlen(passphrase)); | |
1006 | xfree(passphrase); | |
1007 | public = key_from_private(private); | |
1008 | key_free(private); | |
1009 | ||
1010 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1011 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1012 | if (fd == -1) { | |
1013 | printf("Could not save your public key in %s\n", identity_file); | |
1014 | exit(1); | |
1015 | } | |
1016 | f = fdopen(fd, "w"); | |
1017 | if (f == NULL) { | |
1018 | printf("fdopen %s failed\n", identity_file); | |
1019 | exit(1); | |
1020 | } | |
1021 | if (!key_write(public, f)) | |
1022 | fprintf(stderr, "write key failed\n"); | |
1023 | key_free(public); | |
1024 | fprintf(f, " %s\n", new_comment); | |
1025 | fclose(f); | |
1026 | ||
1027 | xfree(comment); | |
1028 | ||
1029 | printf("The comment in your key file has been changed.\n"); | |
1030 | exit(0); | |
1031 | } | |
1032 | ||
1033 | static void | |
1034 | usage(void) | |
1035 | { | |
1036 | fprintf(stderr, "usage: %s [options]\n", __progname); | |
1037 | fprintf(stderr, "Options:\n"); | |
1038 | fprintf(stderr, " -a trials Number of trials for screening DH-GEX moduli.\n"); | |
1039 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
1040 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
1041 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
1042 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
1043 | #ifdef SMARTCARD | |
1044 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
1045 | #endif /* SMARTCARD */ | |
1046 | fprintf(stderr, " -e Convert OpenSSH to RFC 4716 key file.\n"); | |
1047 | fprintf(stderr, " -F hostname Find hostname in known hosts file.\n"); | |
1048 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
1049 | fprintf(stderr, " -G file Generate candidates for DH-GEX moduli.\n"); | |
1050 | fprintf(stderr, " -g Use generic DNS resource record format.\n"); | |
1051 | fprintf(stderr, " -H Hash names in known_hosts file.\n"); | |
1052 | fprintf(stderr, " -i Convert RFC 4716 to OpenSSH key file.\n"); | |
1053 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
1054 | fprintf(stderr, " -M memory Amount of memory (MB) to use for generating DH-GEX moduli.\n"); | |
1055 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
1056 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
1057 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
1058 | fprintf(stderr, " -q Quiet.\n"); | |
1059 | fprintf(stderr, " -R hostname Remove host from known_hosts file.\n"); | |
1060 | fprintf(stderr, " -r hostname Print DNS resource record.\n"); | |
1061 | fprintf(stderr, " -S start Start point (hex) for generating DH-GEX moduli.\n"); | |
1062 | fprintf(stderr, " -T file Screen candidates for DH-GEX moduli.\n"); | |
1063 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
1064 | #ifdef SMARTCARD | |
1065 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
1066 | #endif /* SMARTCARD */ | |
1067 | fprintf(stderr, " -v Verbose.\n"); | |
1068 | fprintf(stderr, " -W gen Generator to use for generating DH-GEX moduli.\n"); | |
1069 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
1070 | ||
1071 | exit(1); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Main program for key management. | |
1076 | */ | |
1077 | int | |
1078 | main(int argc, char **argv) | |
1079 | { | |
1080 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; | |
1081 | char out_file[MAXPATHLEN], *reader_id = NULL; | |
1082 | char *rr_hostname = NULL; | |
1083 | Key *private, *public; | |
1084 | struct passwd *pw; | |
1085 | struct stat st; | |
1086 | int opt, type, fd, download = 0; | |
1087 | u_int32_t memory = 0, generator_wanted = 0, trials = 100; | |
1088 | int do_gen_candidates = 0, do_screen_candidates = 0; | |
1089 | BIGNUM *start = NULL; | |
1090 | FILE *f; | |
1091 | const char *errstr; | |
1092 | ||
1093 | extern int optind; | |
1094 | extern char *optarg; | |
1095 | ||
1096 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
1097 | sanitise_stdfd(); | |
1098 | ||
1099 | __progname = ssh_get_progname(argv[0]); | |
1100 | ||
1101 | SSLeay_add_all_algorithms(); | |
1102 | log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
1103 | ||
1104 | init_rng(); | |
1105 | seed_rng(); | |
1106 | ||
1107 | /* we need this for the home * directory. */ | |
1108 | pw = getpwuid(getuid()); | |
1109 | if (!pw) { | |
1110 | printf("You don't exist, go away!\n"); | |
1111 | exit(1); | |
1112 | } | |
1113 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
1114 | perror("gethostname"); | |
1115 | exit(1); | |
1116 | } | |
1117 | ||
1118 | while ((opt = getopt(argc, argv, | |
1119 | "degiqpclBHvxXyF:b:f:t:U:D:P:N:C:r:g:R:T:G:M:S:a:W:")) != -1) { | |
1120 | switch (opt) { | |
1121 | case 'b': | |
1122 | bits = (u_int32_t)strtonum(optarg, 768, 32768, &errstr); | |
1123 | if (errstr) | |
1124 | fatal("Bits has bad value %s (%s)", | |
1125 | optarg, errstr); | |
1126 | break; | |
1127 | case 'F': | |
1128 | find_host = 1; | |
1129 | rr_hostname = optarg; | |
1130 | break; | |
1131 | case 'H': | |
1132 | hash_hosts = 1; | |
1133 | break; | |
1134 | case 'R': | |
1135 | delete_host = 1; | |
1136 | rr_hostname = optarg; | |
1137 | break; | |
1138 | case 'l': | |
1139 | print_fingerprint = 1; | |
1140 | break; | |
1141 | case 'B': | |
1142 | print_bubblebabble = 1; | |
1143 | break; | |
1144 | case 'p': | |
1145 | change_passphrase = 1; | |
1146 | break; | |
1147 | case 'c': | |
1148 | change_comment = 1; | |
1149 | break; | |
1150 | case 'f': | |
1151 | if (strlcpy(identity_file, optarg, sizeof(identity_file)) >= | |
1152 | sizeof(identity_file)) | |
1153 | fatal("Identity filename too long"); | |
1154 | have_identity = 1; | |
1155 | break; | |
1156 | case 'g': | |
1157 | print_generic = 1; | |
1158 | break; | |
1159 | case 'P': | |
1160 | identity_passphrase = optarg; | |
1161 | break; | |
1162 | case 'N': | |
1163 | identity_new_passphrase = optarg; | |
1164 | break; | |
1165 | case 'C': | |
1166 | identity_comment = optarg; | |
1167 | break; | |
1168 | case 'q': | |
1169 | quiet = 1; | |
1170 | break; | |
1171 | case 'e': | |
1172 | case 'x': | |
1173 | /* export key */ | |
1174 | convert_to_ssh2 = 1; | |
1175 | break; | |
1176 | case 'i': | |
1177 | case 'X': | |
1178 | /* import key */ | |
1179 | convert_from_ssh2 = 1; | |
1180 | break; | |
1181 | case 'y': | |
1182 | print_public = 1; | |
1183 | break; | |
1184 | case 'd': | |
1185 | key_type_name = "dsa"; | |
1186 | break; | |
1187 | case 't': | |
1188 | key_type_name = optarg; | |
1189 | break; | |
1190 | case 'D': | |
1191 | download = 1; | |
1192 | /*FALLTHROUGH*/ | |
1193 | case 'U': | |
1194 | reader_id = optarg; | |
1195 | break; | |
1196 | case 'v': | |
1197 | if (log_level == SYSLOG_LEVEL_INFO) | |
1198 | log_level = SYSLOG_LEVEL_DEBUG1; | |
1199 | else { | |
1200 | if (log_level >= SYSLOG_LEVEL_DEBUG1 && | |
1201 | log_level < SYSLOG_LEVEL_DEBUG3) | |
1202 | log_level++; | |
1203 | } | |
1204 | break; | |
1205 | case 'r': | |
1206 | rr_hostname = optarg; | |
1207 | break; | |
1208 | case 'W': | |
1209 | generator_wanted = (u_int32_t)strtonum(optarg, 1, | |
1210 | UINT_MAX, &errstr); | |
1211 | if (errstr) | |
1212 | fatal("Desired generator has bad value: %s (%s)", | |
1213 | optarg, errstr); | |
1214 | break; | |
1215 | case 'a': | |
1216 | trials = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); | |
1217 | if (errstr) | |
1218 | fatal("Invalid number of trials: %s (%s)", | |
1219 | optarg, errstr); | |
1220 | break; | |
1221 | case 'M': | |
1222 | memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX, &errstr); | |
1223 | if (errstr) { | |
1224 | fatal("Memory limit is %s: %s", errstr, optarg); | |
1225 | } | |
1226 | break; | |
1227 | case 'G': | |
1228 | do_gen_candidates = 1; | |
1229 | if (strlcpy(out_file, optarg, sizeof(out_file)) >= | |
1230 | sizeof(out_file)) | |
1231 | fatal("Output filename too long"); | |
1232 | break; | |
1233 | case 'T': | |
1234 | do_screen_candidates = 1; | |
1235 | if (strlcpy(out_file, optarg, sizeof(out_file)) >= | |
1236 | sizeof(out_file)) | |
1237 | fatal("Output filename too long"); | |
1238 | break; | |
1239 | case 'S': | |
1240 | /* XXX - also compare length against bits */ | |
1241 | if (BN_hex2bn(&start, optarg) == 0) | |
1242 | fatal("Invalid start point."); | |
1243 | break; | |
1244 | case '?': | |
1245 | default: | |
1246 | usage(); | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /* reinit */ | |
1251 | log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1); | |
1252 | ||
1253 | if (optind < argc) { | |
1254 | printf("Too many arguments.\n"); | |
1255 | usage(); | |
1256 | } | |
1257 | if (change_passphrase && change_comment) { | |
1258 | printf("Can only have one of -p and -c.\n"); | |
1259 | usage(); | |
1260 | } | |
1261 | if (print_fingerprint && (delete_host || hash_hosts)) { | |
1262 | printf("Cannot use -l with -D or -R.\n"); | |
1263 | usage(); | |
1264 | } | |
1265 | if (delete_host || hash_hosts || find_host) | |
1266 | do_known_hosts(pw, rr_hostname); | |
1267 | if (print_fingerprint || print_bubblebabble) | |
1268 | do_fingerprint(pw); | |
1269 | if (change_passphrase) | |
1270 | do_change_passphrase(pw); | |
1271 | if (change_comment) | |
1272 | do_change_comment(pw); | |
1273 | if (convert_to_ssh2) | |
1274 | do_convert_to_ssh2(pw); | |
1275 | if (convert_from_ssh2) | |
1276 | do_convert_from_ssh2(pw); | |
1277 | if (print_public) | |
1278 | do_print_public(pw); | |
1279 | if (rr_hostname != NULL) { | |
1280 | unsigned int n = 0; | |
1281 | ||
1282 | if (have_identity) { | |
1283 | n = do_print_resource_record(pw, | |
1284 | identity_file, rr_hostname); | |
1285 | if (n == 0) { | |
1286 | perror(identity_file); | |
1287 | exit(1); | |
1288 | } | |
1289 | exit(0); | |
1290 | } else { | |
1291 | ||
1292 | n += do_print_resource_record(pw, | |
1293 | _PATH_HOST_RSA_KEY_FILE, rr_hostname); | |
1294 | n += do_print_resource_record(pw, | |
1295 | _PATH_HOST_DSA_KEY_FILE, rr_hostname); | |
1296 | ||
1297 | if (n == 0) | |
1298 | fatal("no keys found."); | |
1299 | exit(0); | |
1300 | } | |
1301 | } | |
1302 | if (reader_id != NULL) { | |
1303 | #ifdef SMARTCARD | |
1304 | if (download) | |
1305 | do_download(pw, reader_id); | |
1306 | else | |
1307 | do_upload(pw, reader_id); | |
1308 | #else /* SMARTCARD */ | |
1309 | fatal("no support for smartcards."); | |
1310 | #endif /* SMARTCARD */ | |
1311 | } | |
1312 | ||
1313 | if (do_gen_candidates) { | |
1314 | FILE *out = fopen(out_file, "w"); | |
1315 | ||
1316 | if (out == NULL) { | |
1317 | error("Couldn't open modulus candidate file \"%s\": %s", | |
1318 | out_file, strerror(errno)); | |
1319 | return (1); | |
1320 | } | |
1321 | if (bits == 0) | |
1322 | bits = DEFAULT_BITS; | |
1323 | if (gen_candidates(out, memory, bits, start) != 0) | |
1324 | fatal("modulus candidate generation failed"); | |
1325 | ||
1326 | return (0); | |
1327 | } | |
1328 | ||
1329 | if (do_screen_candidates) { | |
1330 | FILE *in; | |
1331 | FILE *out = fopen(out_file, "w"); | |
1332 | ||
1333 | if (have_identity && strcmp(identity_file, "-") != 0) { | |
1334 | if ((in = fopen(identity_file, "r")) == NULL) { | |
1335 | fatal("Couldn't open modulus candidate " | |
1336 | "file \"%s\": %s", identity_file, | |
1337 | strerror(errno)); | |
1338 | } | |
1339 | } else | |
1340 | in = stdin; | |
1341 | ||
1342 | if (out == NULL) { | |
1343 | fatal("Couldn't open moduli file \"%s\": %s", | |
1344 | out_file, strerror(errno)); | |
1345 | } | |
1346 | if (prime_test(in, out, trials, generator_wanted) != 0) | |
1347 | fatal("modulus screening failed"); | |
1348 | return (0); | |
1349 | } | |
1350 | ||
1351 | arc4random_stir(); | |
1352 | ||
1353 | if (key_type_name == NULL) | |
1354 | key_type_name = "rsa"; | |
1355 | ||
1356 | type = key_type_from_name(key_type_name); | |
1357 | if (type == KEY_UNSPEC) { | |
1358 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
1359 | exit(1); | |
1360 | } | |
1361 | if (bits == 0) | |
1362 | bits = (type == KEY_DSA) ? DEFAULT_BITS_DSA : DEFAULT_BITS; | |
1363 | if (type == KEY_DSA && bits != 1024) | |
1364 | fatal("DSA keys must be 1024 bits"); | |
1365 | if (!quiet) | |
1366 | printf("Generating public/private %s key pair.\n", key_type_name); | |
1367 | private = key_generate(type, bits); | |
1368 | if (private == NULL) { | |
1369 | fprintf(stderr, "key_generate failed\n"); | |
1370 | exit(1); | |
1371 | } | |
1372 | public = key_from_private(private); | |
1373 | ||
1374 | if (!have_identity) | |
1375 | ask_filename(pw, "Enter file in which to save the key"); | |
1376 | ||
1377 | /* Create ~/.ssh directory if it doesn't already exist. */ | |
1378 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
1379 | if (strstr(identity_file, dotsshdir) != NULL && | |
1380 | stat(dotsshdir, &st) < 0) { | |
1381 | if (mkdir(dotsshdir, 0700) < 0) | |
1382 | error("Could not create directory '%s'.", dotsshdir); | |
1383 | else if (!quiet) | |
1384 | printf("Created directory '%s'.\n", dotsshdir); | |
1385 | } | |
1386 | /* If the file already exists, ask the user to confirm. */ | |
1387 | if (stat(identity_file, &st) >= 0) { | |
1388 | char yesno[3]; | |
1389 | printf("%s already exists.\n", identity_file); | |
1390 | printf("Overwrite (y/n)? "); | |
1391 | fflush(stdout); | |
1392 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
1393 | exit(1); | |
1394 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
1395 | exit(1); | |
1396 | } | |
1397 | /* Ask for a passphrase (twice). */ | |
1398 | if (identity_passphrase) | |
1399 | passphrase1 = xstrdup(identity_passphrase); | |
1400 | else if (identity_new_passphrase) | |
1401 | passphrase1 = xstrdup(identity_new_passphrase); | |
1402 | else { | |
1403 | passphrase_again: | |
1404 | passphrase1 = | |
1405 | read_passphrase("Enter passphrase (empty for no " | |
1406 | "passphrase): ", RP_ALLOW_STDIN); | |
1407 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
1408 | RP_ALLOW_STDIN); | |
1409 | if (strcmp(passphrase1, passphrase2) != 0) { | |
1410 | /* | |
1411 | * The passphrases do not match. Clear them and | |
1412 | * retry. | |
1413 | */ | |
1414 | memset(passphrase1, 0, strlen(passphrase1)); | |
1415 | memset(passphrase2, 0, strlen(passphrase2)); | |
1416 | xfree(passphrase1); | |
1417 | xfree(passphrase2); | |
1418 | printf("Passphrases do not match. Try again.\n"); | |
1419 | goto passphrase_again; | |
1420 | } | |
1421 | /* Clear the other copy of the passphrase. */ | |
1422 | memset(passphrase2, 0, strlen(passphrase2)); | |
1423 | xfree(passphrase2); | |
1424 | } | |
1425 | ||
1426 | if (identity_comment) { | |
1427 | strlcpy(comment, identity_comment, sizeof(comment)); | |
1428 | } else { | |
1429 | /* Create default comment field for the passphrase. */ | |
1430 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
1431 | } | |
1432 | ||
1433 | /* Save the key with the given passphrase and comment. */ | |
1434 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
1435 | printf("Saving the key failed: %s.\n", identity_file); | |
1436 | memset(passphrase1, 0, strlen(passphrase1)); | |
1437 | xfree(passphrase1); | |
1438 | exit(1); | |
1439 | } | |
1440 | /* Clear the passphrase. */ | |
1441 | memset(passphrase1, 0, strlen(passphrase1)); | |
1442 | xfree(passphrase1); | |
1443 | ||
1444 | /* Clear the private key and the random number generator. */ | |
1445 | key_free(private); | |
1446 | arc4random_stir(); | |
1447 | ||
1448 | if (!quiet) | |
1449 | printf("Your identification has been saved in %s.\n", identity_file); | |
1450 | ||
1451 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1452 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1453 | if (fd == -1) { | |
1454 | printf("Could not save your public key in %s\n", identity_file); | |
1455 | exit(1); | |
1456 | } | |
1457 | f = fdopen(fd, "w"); | |
1458 | if (f == NULL) { | |
1459 | printf("fdopen %s failed\n", identity_file); | |
1460 | exit(1); | |
1461 | } | |
1462 | if (!key_write(public, f)) | |
1463 | fprintf(stderr, "write key failed\n"); | |
1464 | fprintf(f, " %s\n", comment); | |
1465 | fclose(f); | |
1466 | ||
1467 | if (!quiet) { | |
1468 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
1469 | char *ra = key_fingerprint(public, SSH_FP_MD5, | |
1470 | SSH_FP_RANDOMART); | |
1471 | printf("Your public key has been saved in %s.\n", | |
1472 | identity_file); | |
1473 | printf("The key fingerprint is:\n"); | |
1474 | printf("%s %s\n", fp, comment); | |
1475 | printf("The key's randomart image is:\n"); | |
1476 | printf("%s\n", ra); | |
1477 | xfree(ra); | |
1478 | xfree(fp); | |
1479 | } | |
1480 | ||
1481 | key_free(public); | |
1482 | exit(0); | |
1483 | } |