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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Identity and host key generation and maintenance. | |
6 | * | |
7 | * As far as I am concerned, the code I have written for this software | |
8 | * can be used freely for any purpose. Any derived versions of this | |
9 | * software must be clearly marked as such, and if the derived work is | |
10 | * incompatible with the protocol description in the RFC file, it must be | |
11 | * called by a name other than "ssh" or "Secure Shell". | |
12 | */ | |
13 | ||
14 | #include "includes.h" | |
15 | RCSID("$OpenBSD: ssh-keygen.c,v 1.113 2003/12/22 09:16:58 djm Exp $"); | |
16 | ||
17 | #include <openssl/evp.h> | |
18 | #include <openssl/pem.h> | |
19 | ||
20 | #include "xmalloc.h" | |
21 | #include "key.h" | |
22 | #include "rsa.h" | |
23 | #include "authfile.h" | |
24 | #include "uuencode.h" | |
25 | #include "buffer.h" | |
26 | #include "bufaux.h" | |
27 | #include "pathnames.h" | |
28 | #include "log.h" | |
29 | #include "readpass.h" | |
30 | #include "moduli.h" | |
31 | ||
32 | #ifdef SMARTCARD | |
33 | #include "scard.h" | |
34 | #endif | |
35 | #include "dns.h" | |
36 | ||
37 | /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ | |
38 | int bits = 1024; | |
39 | ||
40 | /* | |
41 | * Flag indicating that we just want to change the passphrase. This can be | |
42 | * set on the command line. | |
43 | */ | |
44 | int change_passphrase = 0; | |
45 | ||
46 | /* | |
47 | * Flag indicating that we just want to change the comment. This can be set | |
48 | * on the command line. | |
49 | */ | |
50 | int change_comment = 0; | |
51 | ||
52 | int quiet = 0; | |
53 | ||
54 | /* Flag indicating that we just want to see the key fingerprint */ | |
55 | int print_fingerprint = 0; | |
56 | int print_bubblebabble = 0; | |
57 | ||
58 | /* The identity file name, given on the command line or entered by the user. */ | |
59 | char identity_file[1024]; | |
60 | int have_identity = 0; | |
61 | ||
62 | /* This is set to the passphrase if given on the command line. */ | |
63 | char *identity_passphrase = NULL; | |
64 | ||
65 | /* This is set to the new passphrase if given on the command line. */ | |
66 | char *identity_new_passphrase = NULL; | |
67 | ||
68 | /* This is set to the new comment if given on the command line. */ | |
69 | char *identity_comment = NULL; | |
70 | ||
71 | /* Dump public key file in format used by real and the original SSH 2 */ | |
72 | int convert_to_ssh2 = 0; | |
73 | int convert_from_ssh2 = 0; | |
74 | int print_public = 0; | |
75 | int print_generic = 0; | |
76 | ||
77 | char *key_type_name = NULL; | |
78 | ||
79 | /* argv0 */ | |
80 | #ifdef HAVE___PROGNAME | |
81 | extern char *__progname; | |
82 | #else | |
83 | char *__progname; | |
84 | #endif | |
85 | ||
86 | char hostname[MAXHOSTNAMELEN]; | |
87 | ||
88 | static void | |
89 | ask_filename(struct passwd *pw, const char *prompt) | |
90 | { | |
91 | char buf[1024]; | |
92 | char *name = NULL; | |
93 | ||
94 | if (key_type_name == NULL) | |
95 | name = _PATH_SSH_CLIENT_ID_RSA; | |
96 | else | |
97 | switch (key_type_from_name(key_type_name)) { | |
98 | case KEY_RSA1: | |
99 | name = _PATH_SSH_CLIENT_IDENTITY; | |
100 | break; | |
101 | case KEY_DSA: | |
102 | name = _PATH_SSH_CLIENT_ID_DSA; | |
103 | break; | |
104 | case KEY_RSA: | |
105 | name = _PATH_SSH_CLIENT_ID_RSA; | |
106 | break; | |
107 | default: | |
108 | fprintf(stderr, "bad key type"); | |
109 | exit(1); | |
110 | break; | |
111 | } | |
112 | ||
113 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); | |
114 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
115 | if (fgets(buf, sizeof(buf), stdin) == NULL) | |
116 | exit(1); | |
117 | if (strchr(buf, '\n')) | |
118 | *strchr(buf, '\n') = 0; | |
119 | if (strcmp(buf, "") != 0) | |
120 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
121 | have_identity = 1; | |
122 | } | |
123 | ||
124 | static Key * | |
125 | load_identity(char *filename) | |
126 | { | |
127 | char *pass; | |
128 | Key *prv; | |
129 | ||
130 | prv = key_load_private(filename, "", NULL); | |
131 | if (prv == NULL) { | |
132 | if (identity_passphrase) | |
133 | pass = xstrdup(identity_passphrase); | |
134 | else | |
135 | pass = read_passphrase("Enter passphrase: ", | |
136 | RP_ALLOW_STDIN); | |
137 | prv = key_load_private(filename, pass, NULL); | |
138 | memset(pass, 0, strlen(pass)); | |
139 | xfree(pass); | |
140 | } | |
141 | return prv; | |
142 | } | |
143 | ||
144 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
145 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" | |
146 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" | |
147 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
148 | ||
149 | static void | |
150 | do_convert_to_ssh2(struct passwd *pw) | |
151 | { | |
152 | Key *k; | |
153 | u_int len; | |
154 | u_char *blob; | |
155 | struct stat st; | |
156 | ||
157 | if (!have_identity) | |
158 | ask_filename(pw, "Enter file in which the key is"); | |
159 | if (stat(identity_file, &st) < 0) { | |
160 | perror(identity_file); | |
161 | exit(1); | |
162 | } | |
163 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
164 | if ((k = load_identity(identity_file)) == NULL) { | |
165 | fprintf(stderr, "load failed\n"); | |
166 | exit(1); | |
167 | } | |
168 | } | |
169 | if (k->type == KEY_RSA1) { | |
170 | fprintf(stderr, "version 1 keys are not supported\n"); | |
171 | exit(1); | |
172 | } | |
173 | if (key_to_blob(k, &blob, &len) <= 0) { | |
174 | fprintf(stderr, "key_to_blob failed\n"); | |
175 | exit(1); | |
176 | } | |
177 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
178 | fprintf(stdout, | |
179 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", | |
180 | key_size(k), key_type(k), | |
181 | pw->pw_name, hostname); | |
182 | dump_base64(stdout, blob, len); | |
183 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
184 | key_free(k); | |
185 | xfree(blob); | |
186 | exit(0); | |
187 | } | |
188 | ||
189 | static void | |
190 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
191 | { | |
192 | u_int bits = buffer_get_int(b); | |
193 | u_int bytes = (bits + 7) / 8; | |
194 | ||
195 | if (buffer_len(b) < bytes) | |
196 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
197 | "need %d have %d", bytes, buffer_len(b)); | |
198 | BN_bin2bn(buffer_ptr(b), bytes, value); | |
199 | buffer_consume(b, bytes); | |
200 | } | |
201 | ||
202 | static Key * | |
203 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) | |
204 | { | |
205 | Buffer b; | |
206 | Key *key = NULL; | |
207 | char *type, *cipher; | |
208 | u_char *sig, data[] = "abcde12345"; | |
209 | int magic, rlen, ktype, i1, i2, i3, i4; | |
210 | u_int slen; | |
211 | u_long e; | |
212 | ||
213 | buffer_init(&b); | |
214 | buffer_append(&b, blob, blen); | |
215 | ||
216 | magic = buffer_get_int(&b); | |
217 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
218 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
219 | buffer_free(&b); | |
220 | return NULL; | |
221 | } | |
222 | i1 = buffer_get_int(&b); | |
223 | type = buffer_get_string(&b, NULL); | |
224 | cipher = buffer_get_string(&b, NULL); | |
225 | i2 = buffer_get_int(&b); | |
226 | i3 = buffer_get_int(&b); | |
227 | i4 = buffer_get_int(&b); | |
228 | debug("ignore (%d %d %d %d)", i1,i2,i3,i4); | |
229 | if (strcmp(cipher, "none") != 0) { | |
230 | error("unsupported cipher %s", cipher); | |
231 | xfree(cipher); | |
232 | buffer_free(&b); | |
233 | xfree(type); | |
234 | return NULL; | |
235 | } | |
236 | xfree(cipher); | |
237 | ||
238 | if (strstr(type, "dsa")) { | |
239 | ktype = KEY_DSA; | |
240 | } else if (strstr(type, "rsa")) { | |
241 | ktype = KEY_RSA; | |
242 | } else { | |
243 | xfree(type); | |
244 | return NULL; | |
245 | } | |
246 | key = key_new_private(ktype); | |
247 | xfree(type); | |
248 | ||
249 | switch (key->type) { | |
250 | case KEY_DSA: | |
251 | buffer_get_bignum_bits(&b, key->dsa->p); | |
252 | buffer_get_bignum_bits(&b, key->dsa->g); | |
253 | buffer_get_bignum_bits(&b, key->dsa->q); | |
254 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
255 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
256 | break; | |
257 | case KEY_RSA: | |
258 | e = buffer_get_char(&b); | |
259 | debug("e %lx", e); | |
260 | if (e < 30) { | |
261 | e <<= 8; | |
262 | e += buffer_get_char(&b); | |
263 | debug("e %lx", e); | |
264 | e <<= 8; | |
265 | e += buffer_get_char(&b); | |
266 | debug("e %lx", e); | |
267 | } | |
268 | if (!BN_set_word(key->rsa->e, e)) { | |
269 | buffer_free(&b); | |
270 | key_free(key); | |
271 | return NULL; | |
272 | } | |
273 | buffer_get_bignum_bits(&b, key->rsa->d); | |
274 | buffer_get_bignum_bits(&b, key->rsa->n); | |
275 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
276 | buffer_get_bignum_bits(&b, key->rsa->q); | |
277 | buffer_get_bignum_bits(&b, key->rsa->p); | |
278 | rsa_generate_additional_parameters(key->rsa); | |
279 | break; | |
280 | } | |
281 | rlen = buffer_len(&b); | |
282 | if (rlen != 0) | |
283 | error("do_convert_private_ssh2_from_blob: " | |
284 | "remaining bytes in key blob %d", rlen); | |
285 | buffer_free(&b); | |
286 | ||
287 | /* try the key */ | |
288 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
289 | key_verify(key, sig, slen, data, sizeof(data)); | |
290 | xfree(sig); | |
291 | return key; | |
292 | } | |
293 | ||
294 | static void | |
295 | do_convert_from_ssh2(struct passwd *pw) | |
296 | { | |
297 | Key *k; | |
298 | int blen; | |
299 | u_int len; | |
300 | char line[1024], *p; | |
301 | u_char blob[8096]; | |
302 | char encoded[8096]; | |
303 | struct stat st; | |
304 | int escaped = 0, private = 0, ok; | |
305 | FILE *fp; | |
306 | ||
307 | if (!have_identity) | |
308 | ask_filename(pw, "Enter file in which the key is"); | |
309 | if (stat(identity_file, &st) < 0) { | |
310 | perror(identity_file); | |
311 | exit(1); | |
312 | } | |
313 | fp = fopen(identity_file, "r"); | |
314 | if (fp == NULL) { | |
315 | perror(identity_file); | |
316 | exit(1); | |
317 | } | |
318 | encoded[0] = '\0'; | |
319 | while (fgets(line, sizeof(line), fp)) { | |
320 | if (!(p = strchr(line, '\n'))) { | |
321 | fprintf(stderr, "input line too long.\n"); | |
322 | exit(1); | |
323 | } | |
324 | if (p > line && p[-1] == '\\') | |
325 | escaped++; | |
326 | if (strncmp(line, "----", 4) == 0 || | |
327 | strstr(line, ": ") != NULL) { | |
328 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
329 | private = 1; | |
330 | if (strstr(line, " END ") != NULL) { | |
331 | break; | |
332 | } | |
333 | /* fprintf(stderr, "ignore: %s", line); */ | |
334 | continue; | |
335 | } | |
336 | if (escaped) { | |
337 | escaped--; | |
338 | /* fprintf(stderr, "escaped: %s", line); */ | |
339 | continue; | |
340 | } | |
341 | *p = '\0'; | |
342 | strlcat(encoded, line, sizeof(encoded)); | |
343 | } | |
344 | len = strlen(encoded); | |
345 | if (((len % 4) == 3) && | |
346 | (encoded[len-1] == '=') && | |
347 | (encoded[len-2] == '=') && | |
348 | (encoded[len-3] == '=')) | |
349 | encoded[len-3] = '\0'; | |
350 | blen = uudecode(encoded, blob, sizeof(blob)); | |
351 | if (blen < 0) { | |
352 | fprintf(stderr, "uudecode failed.\n"); | |
353 | exit(1); | |
354 | } | |
355 | k = private ? | |
356 | do_convert_private_ssh2_from_blob(blob, blen) : | |
357 | key_from_blob(blob, blen); | |
358 | if (k == NULL) { | |
359 | fprintf(stderr, "decode blob failed.\n"); | |
360 | exit(1); | |
361 | } | |
362 | ok = private ? | |
363 | (k->type == KEY_DSA ? | |
364 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
365 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
366 | key_write(k, stdout); | |
367 | if (!ok) { | |
368 | fprintf(stderr, "key write failed"); | |
369 | exit(1); | |
370 | } | |
371 | key_free(k); | |
372 | if (!private) | |
373 | fprintf(stdout, "\n"); | |
374 | fclose(fp); | |
375 | exit(0); | |
376 | } | |
377 | ||
378 | static void | |
379 | do_print_public(struct passwd *pw) | |
380 | { | |
381 | Key *prv; | |
382 | struct stat st; | |
383 | ||
384 | if (!have_identity) | |
385 | ask_filename(pw, "Enter file in which the key is"); | |
386 | if (stat(identity_file, &st) < 0) { | |
387 | perror(identity_file); | |
388 | exit(1); | |
389 | } | |
390 | prv = load_identity(identity_file); | |
391 | if (prv == NULL) { | |
392 | fprintf(stderr, "load failed\n"); | |
393 | exit(1); | |
394 | } | |
395 | if (!key_write(prv, stdout)) | |
396 | fprintf(stderr, "key_write failed"); | |
397 | key_free(prv); | |
398 | fprintf(stdout, "\n"); | |
399 | exit(0); | |
400 | } | |
401 | ||
402 | #ifdef SMARTCARD | |
403 | static void | |
404 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
405 | { | |
406 | Key *prv = NULL; | |
407 | struct stat st; | |
408 | int ret; | |
409 | ||
410 | if (!have_identity) | |
411 | ask_filename(pw, "Enter file in which the key is"); | |
412 | if (stat(identity_file, &st) < 0) { | |
413 | perror(identity_file); | |
414 | exit(1); | |
415 | } | |
416 | prv = load_identity(identity_file); | |
417 | if (prv == NULL) { | |
418 | error("load failed"); | |
419 | exit(1); | |
420 | } | |
421 | ret = sc_put_key(prv, sc_reader_id); | |
422 | key_free(prv); | |
423 | if (ret < 0) | |
424 | exit(1); | |
425 | logit("loading key done"); | |
426 | exit(0); | |
427 | } | |
428 | ||
429 | static void | |
430 | do_download(struct passwd *pw, const char *sc_reader_id) | |
431 | { | |
432 | Key **keys = NULL; | |
433 | int i; | |
434 | ||
435 | keys = sc_get_keys(sc_reader_id, NULL); | |
436 | if (keys == NULL) | |
437 | fatal("cannot read public key from smartcard"); | |
438 | for (i = 0; keys[i]; i++) { | |
439 | key_write(keys[i], stdout); | |
440 | key_free(keys[i]); | |
441 | fprintf(stdout, "\n"); | |
442 | } | |
443 | xfree(keys); | |
444 | exit(0); | |
445 | } | |
446 | #endif /* SMARTCARD */ | |
447 | ||
448 | static void | |
449 | do_fingerprint(struct passwd *pw) | |
450 | { | |
451 | FILE *f; | |
452 | Key *public; | |
453 | char *comment = NULL, *cp, *ep, line[16*1024], *fp; | |
454 | int i, skip = 0, num = 1, invalid = 1; | |
455 | enum fp_rep rep; | |
456 | enum fp_type fptype; | |
457 | struct stat st; | |
458 | ||
459 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
460 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
461 | ||
462 | if (!have_identity) | |
463 | ask_filename(pw, "Enter file in which the key is"); | |
464 | if (stat(identity_file, &st) < 0) { | |
465 | perror(identity_file); | |
466 | exit(1); | |
467 | } | |
468 | public = key_load_public(identity_file, &comment); | |
469 | if (public != NULL) { | |
470 | fp = key_fingerprint(public, fptype, rep); | |
471 | printf("%u %s %s\n", key_size(public), fp, comment); | |
472 | key_free(public); | |
473 | xfree(comment); | |
474 | xfree(fp); | |
475 | exit(0); | |
476 | } | |
477 | if (comment) | |
478 | xfree(comment); | |
479 | ||
480 | f = fopen(identity_file, "r"); | |
481 | if (f != NULL) { | |
482 | while (fgets(line, sizeof(line), f)) { | |
483 | i = strlen(line) - 1; | |
484 | if (line[i] != '\n') { | |
485 | error("line %d too long: %.40s...", num, line); | |
486 | skip = 1; | |
487 | continue; | |
488 | } | |
489 | num++; | |
490 | if (skip) { | |
491 | skip = 0; | |
492 | continue; | |
493 | } | |
494 | line[i] = '\0'; | |
495 | ||
496 | /* Skip leading whitespace, empty and comment lines. */ | |
497 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
498 | ; | |
499 | if (!*cp || *cp == '\n' || *cp == '#') | |
500 | continue ; | |
501 | i = strtol(cp, &ep, 10); | |
502 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
503 | int quoted = 0; | |
504 | comment = cp; | |
505 | for (; *cp && (quoted || (*cp != ' ' && | |
506 | *cp != '\t')); cp++) { | |
507 | if (*cp == '\\' && cp[1] == '"') | |
508 | cp++; /* Skip both */ | |
509 | else if (*cp == '"') | |
510 | quoted = !quoted; | |
511 | } | |
512 | if (!*cp) | |
513 | continue; | |
514 | *cp++ = '\0'; | |
515 | } | |
516 | ep = cp; | |
517 | public = key_new(KEY_RSA1); | |
518 | if (key_read(public, &cp) != 1) { | |
519 | cp = ep; | |
520 | key_free(public); | |
521 | public = key_new(KEY_UNSPEC); | |
522 | if (key_read(public, &cp) != 1) { | |
523 | key_free(public); | |
524 | continue; | |
525 | } | |
526 | } | |
527 | comment = *cp ? cp : comment; | |
528 | fp = key_fingerprint(public, fptype, rep); | |
529 | printf("%u %s %s\n", key_size(public), fp, | |
530 | comment ? comment : "no comment"); | |
531 | xfree(fp); | |
532 | key_free(public); | |
533 | invalid = 0; | |
534 | } | |
535 | fclose(f); | |
536 | } | |
537 | if (invalid) { | |
538 | printf("%s is not a public key file.\n", identity_file); | |
539 | exit(1); | |
540 | } | |
541 | exit(0); | |
542 | } | |
543 | ||
544 | /* | |
545 | * Perform changing a passphrase. The argument is the passwd structure | |
546 | * for the current user. | |
547 | */ | |
548 | static void | |
549 | do_change_passphrase(struct passwd *pw) | |
550 | { | |
551 | char *comment; | |
552 | char *old_passphrase, *passphrase1, *passphrase2; | |
553 | struct stat st; | |
554 | Key *private; | |
555 | ||
556 | if (!have_identity) | |
557 | ask_filename(pw, "Enter file in which the key is"); | |
558 | if (stat(identity_file, &st) < 0) { | |
559 | perror(identity_file); | |
560 | exit(1); | |
561 | } | |
562 | /* Try to load the file with empty passphrase. */ | |
563 | private = key_load_private(identity_file, "", &comment); | |
564 | if (private == NULL) { | |
565 | if (identity_passphrase) | |
566 | old_passphrase = xstrdup(identity_passphrase); | |
567 | else | |
568 | old_passphrase = | |
569 | read_passphrase("Enter old passphrase: ", | |
570 | RP_ALLOW_STDIN); | |
571 | private = key_load_private(identity_file, old_passphrase, | |
572 | &comment); | |
573 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
574 | xfree(old_passphrase); | |
575 | if (private == NULL) { | |
576 | printf("Bad passphrase.\n"); | |
577 | exit(1); | |
578 | } | |
579 | } | |
580 | printf("Key has comment '%s'\n", comment); | |
581 | ||
582 | /* Ask the new passphrase (twice). */ | |
583 | if (identity_new_passphrase) { | |
584 | passphrase1 = xstrdup(identity_new_passphrase); | |
585 | passphrase2 = NULL; | |
586 | } else { | |
587 | passphrase1 = | |
588 | read_passphrase("Enter new passphrase (empty for no " | |
589 | "passphrase): ", RP_ALLOW_STDIN); | |
590 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
591 | RP_ALLOW_STDIN); | |
592 | ||
593 | /* Verify that they are the same. */ | |
594 | if (strcmp(passphrase1, passphrase2) != 0) { | |
595 | memset(passphrase1, 0, strlen(passphrase1)); | |
596 | memset(passphrase2, 0, strlen(passphrase2)); | |
597 | xfree(passphrase1); | |
598 | xfree(passphrase2); | |
599 | printf("Pass phrases do not match. Try again.\n"); | |
600 | exit(1); | |
601 | } | |
602 | /* Destroy the other copy. */ | |
603 | memset(passphrase2, 0, strlen(passphrase2)); | |
604 | xfree(passphrase2); | |
605 | } | |
606 | ||
607 | /* Save the file using the new passphrase. */ | |
608 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
609 | printf("Saving the key failed: %s.\n", identity_file); | |
610 | memset(passphrase1, 0, strlen(passphrase1)); | |
611 | xfree(passphrase1); | |
612 | key_free(private); | |
613 | xfree(comment); | |
614 | exit(1); | |
615 | } | |
616 | /* Destroy the passphrase and the copy of the key in memory. */ | |
617 | memset(passphrase1, 0, strlen(passphrase1)); | |
618 | xfree(passphrase1); | |
619 | key_free(private); /* Destroys contents */ | |
620 | xfree(comment); | |
621 | ||
622 | printf("Your identification has been saved with the new passphrase.\n"); | |
623 | exit(0); | |
624 | } | |
625 | ||
626 | /* | |
627 | * Print the SSHFP RR. | |
628 | */ | |
629 | static void | |
630 | do_print_resource_record(struct passwd *pw, char *hostname) | |
631 | { | |
632 | Key *public; | |
633 | char *comment = NULL; | |
634 | struct stat st; | |
635 | ||
636 | if (!have_identity) | |
637 | ask_filename(pw, "Enter file in which the key is"); | |
638 | if (stat(identity_file, &st) < 0) { | |
639 | perror(identity_file); | |
640 | exit(1); | |
641 | } | |
642 | public = key_load_public(identity_file, &comment); | |
643 | if (public != NULL) { | |
644 | export_dns_rr(hostname, public, stdout, print_generic); | |
645 | key_free(public); | |
646 | xfree(comment); | |
647 | exit(0); | |
648 | } | |
649 | if (comment) | |
650 | xfree(comment); | |
651 | ||
652 | printf("failed to read v2 public key from %s.\n", identity_file); | |
653 | exit(1); | |
654 | } | |
655 | ||
656 | /* | |
657 | * Change the comment of a private key file. | |
658 | */ | |
659 | static void | |
660 | do_change_comment(struct passwd *pw) | |
661 | { | |
662 | char new_comment[1024], *comment, *passphrase; | |
663 | Key *private; | |
664 | Key *public; | |
665 | struct stat st; | |
666 | FILE *f; | |
667 | int fd; | |
668 | ||
669 | if (!have_identity) | |
670 | ask_filename(pw, "Enter file in which the key is"); | |
671 | if (stat(identity_file, &st) < 0) { | |
672 | perror(identity_file); | |
673 | exit(1); | |
674 | } | |
675 | private = key_load_private(identity_file, "", &comment); | |
676 | if (private == NULL) { | |
677 | if (identity_passphrase) | |
678 | passphrase = xstrdup(identity_passphrase); | |
679 | else if (identity_new_passphrase) | |
680 | passphrase = xstrdup(identity_new_passphrase); | |
681 | else | |
682 | passphrase = read_passphrase("Enter passphrase: ", | |
683 | RP_ALLOW_STDIN); | |
684 | /* Try to load using the passphrase. */ | |
685 | private = key_load_private(identity_file, passphrase, &comment); | |
686 | if (private == NULL) { | |
687 | memset(passphrase, 0, strlen(passphrase)); | |
688 | xfree(passphrase); | |
689 | printf("Bad passphrase.\n"); | |
690 | exit(1); | |
691 | } | |
692 | } else { | |
693 | passphrase = xstrdup(""); | |
694 | } | |
695 | if (private->type != KEY_RSA1) { | |
696 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
697 | key_free(private); | |
698 | exit(1); | |
699 | } | |
700 | printf("Key now has comment '%s'\n", comment); | |
701 | ||
702 | if (identity_comment) { | |
703 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
704 | } else { | |
705 | printf("Enter new comment: "); | |
706 | fflush(stdout); | |
707 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
708 | memset(passphrase, 0, strlen(passphrase)); | |
709 | key_free(private); | |
710 | exit(1); | |
711 | } | |
712 | if (strchr(new_comment, '\n')) | |
713 | *strchr(new_comment, '\n') = 0; | |
714 | } | |
715 | ||
716 | /* Save the file using the new passphrase. */ | |
717 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
718 | printf("Saving the key failed: %s.\n", identity_file); | |
719 | memset(passphrase, 0, strlen(passphrase)); | |
720 | xfree(passphrase); | |
721 | key_free(private); | |
722 | xfree(comment); | |
723 | exit(1); | |
724 | } | |
725 | memset(passphrase, 0, strlen(passphrase)); | |
726 | xfree(passphrase); | |
727 | public = key_from_private(private); | |
728 | key_free(private); | |
729 | ||
730 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
731 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
732 | if (fd == -1) { | |
733 | printf("Could not save your public key in %s\n", identity_file); | |
734 | exit(1); | |
735 | } | |
736 | f = fdopen(fd, "w"); | |
737 | if (f == NULL) { | |
738 | printf("fdopen %s failed", identity_file); | |
739 | exit(1); | |
740 | } | |
741 | if (!key_write(public, f)) | |
742 | fprintf(stderr, "write key failed"); | |
743 | key_free(public); | |
744 | fprintf(f, " %s\n", new_comment); | |
745 | fclose(f); | |
746 | ||
747 | xfree(comment); | |
748 | ||
749 | printf("The comment in your key file has been changed.\n"); | |
750 | exit(0); | |
751 | } | |
752 | ||
753 | static void | |
754 | usage(void) | |
755 | { | |
756 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
757 | fprintf(stderr, "Options:\n"); | |
758 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
759 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
760 | fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); | |
761 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
762 | fprintf(stderr, " -g Use generic DNS resource record format.\n"); | |
763 | fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); | |
764 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
765 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
766 | fprintf(stderr, " -q Quiet.\n"); | |
767 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
768 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
769 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
770 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
771 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
772 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
773 | fprintf(stderr, " -r hostname Print DNS resource record.\n"); | |
774 | #ifdef SMARTCARD | |
775 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
776 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
777 | #endif /* SMARTCARD */ | |
778 | ||
779 | fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n"); | |
780 | fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n"); | |
781 | ||
782 | exit(1); | |
783 | } | |
784 | ||
785 | /* | |
786 | * Main program for key management. | |
787 | */ | |
788 | int | |
789 | main(int ac, char **av) | |
790 | { | |
791 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; | |
792 | char out_file[MAXPATHLEN], *reader_id = NULL; | |
793 | char *resource_record_hostname = NULL; | |
794 | Key *private, *public; | |
795 | struct passwd *pw; | |
796 | struct stat st; | |
797 | int opt, type, fd, download = 0, memory = 0; | |
798 | int generator_wanted = 0, trials = 100; | |
799 | int do_gen_candidates = 0, do_screen_candidates = 0; | |
800 | int log_level = SYSLOG_LEVEL_INFO; | |
801 | BIGNUM *start = NULL; | |
802 | FILE *f; | |
803 | ||
804 | extern int optind; | |
805 | extern char *optarg; | |
806 | ||
807 | __progname = ssh_get_progname(av[0]); | |
808 | ||
809 | SSLeay_add_all_algorithms(); | |
810 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); | |
811 | ||
812 | init_rng(); | |
813 | seed_rng(); | |
814 | ||
815 | /* we need this for the home * directory. */ | |
816 | pw = getpwuid(getuid()); | |
817 | if (!pw) { | |
818 | printf("You don't exist, go away!\n"); | |
819 | exit(1); | |
820 | } | |
821 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
822 | perror("gethostname"); | |
823 | exit(1); | |
824 | } | |
825 | ||
826 | while ((opt = getopt(ac, av, | |
827 | "degiqpclBRvxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) { | |
828 | switch (opt) { | |
829 | case 'b': | |
830 | bits = atoi(optarg); | |
831 | if (bits < 512 || bits > 32768) { | |
832 | printf("Bits has bad value.\n"); | |
833 | exit(1); | |
834 | } | |
835 | break; | |
836 | case 'l': | |
837 | print_fingerprint = 1; | |
838 | break; | |
839 | case 'B': | |
840 | print_bubblebabble = 1; | |
841 | break; | |
842 | case 'p': | |
843 | change_passphrase = 1; | |
844 | break; | |
845 | case 'c': | |
846 | change_comment = 1; | |
847 | break; | |
848 | case 'f': | |
849 | strlcpy(identity_file, optarg, sizeof(identity_file)); | |
850 | have_identity = 1; | |
851 | break; | |
852 | case 'g': | |
853 | print_generic = 1; | |
854 | break; | |
855 | case 'P': | |
856 | identity_passphrase = optarg; | |
857 | break; | |
858 | case 'N': | |
859 | identity_new_passphrase = optarg; | |
860 | break; | |
861 | case 'C': | |
862 | identity_comment = optarg; | |
863 | break; | |
864 | case 'q': | |
865 | quiet = 1; | |
866 | break; | |
867 | case 'R': | |
868 | /* unused */ | |
869 | exit(0); | |
870 | break; | |
871 | case 'e': | |
872 | case 'x': | |
873 | /* export key */ | |
874 | convert_to_ssh2 = 1; | |
875 | break; | |
876 | case 'i': | |
877 | case 'X': | |
878 | /* import key */ | |
879 | convert_from_ssh2 = 1; | |
880 | break; | |
881 | case 'y': | |
882 | print_public = 1; | |
883 | break; | |
884 | case 'd': | |
885 | key_type_name = "dsa"; | |
886 | break; | |
887 | case 't': | |
888 | key_type_name = optarg; | |
889 | break; | |
890 | case 'D': | |
891 | download = 1; | |
892 | case 'U': | |
893 | reader_id = optarg; | |
894 | break; | |
895 | case 'v': | |
896 | if (log_level == SYSLOG_LEVEL_INFO) | |
897 | log_level = SYSLOG_LEVEL_DEBUG1; | |
898 | else { | |
899 | if (log_level >= SYSLOG_LEVEL_DEBUG1 && | |
900 | log_level < SYSLOG_LEVEL_DEBUG3) | |
901 | log_level++; | |
902 | } | |
903 | break; | |
904 | case 'r': | |
905 | resource_record_hostname = optarg; | |
906 | break; | |
907 | case 'W': | |
908 | generator_wanted = atoi(optarg); | |
909 | if (generator_wanted < 1) | |
910 | fatal("Desired generator has bad value."); | |
911 | break; | |
912 | case 'a': | |
913 | trials = atoi(optarg); | |
914 | if (trials < TRIAL_MINIMUM) { | |
915 | fatal("Minimum primality trials is %d", | |
916 | TRIAL_MINIMUM); | |
917 | } | |
918 | break; | |
919 | case 'M': | |
920 | memory = atoi(optarg); | |
921 | if (memory != 0 && | |
922 | (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) { | |
923 | fatal("Invalid memory amount (min %ld, max %ld)", | |
924 | LARGE_MINIMUM, LARGE_MAXIMUM); | |
925 | } | |
926 | break; | |
927 | case 'G': | |
928 | do_gen_candidates = 1; | |
929 | strlcpy(out_file, optarg, sizeof(out_file)); | |
930 | break; | |
931 | case 'T': | |
932 | do_screen_candidates = 1; | |
933 | strlcpy(out_file, optarg, sizeof(out_file)); | |
934 | break; | |
935 | case 'S': | |
936 | /* XXX - also compare length against bits */ | |
937 | if (BN_hex2bn(&start, optarg) == 0) | |
938 | fatal("Invalid start point."); | |
939 | break; | |
940 | case '?': | |
941 | default: | |
942 | usage(); | |
943 | } | |
944 | } | |
945 | ||
946 | /* reinit */ | |
947 | log_init(av[0], log_level, SYSLOG_FACILITY_USER, 1); | |
948 | ||
949 | if (optind < ac) { | |
950 | printf("Too many arguments.\n"); | |
951 | usage(); | |
952 | } | |
953 | if (change_passphrase && change_comment) { | |
954 | printf("Can only have one of -p and -c.\n"); | |
955 | usage(); | |
956 | } | |
957 | if (print_fingerprint || print_bubblebabble) | |
958 | do_fingerprint(pw); | |
959 | if (change_passphrase) | |
960 | do_change_passphrase(pw); | |
961 | if (change_comment) | |
962 | do_change_comment(pw); | |
963 | if (convert_to_ssh2) | |
964 | do_convert_to_ssh2(pw); | |
965 | if (convert_from_ssh2) | |
966 | do_convert_from_ssh2(pw); | |
967 | if (print_public) | |
968 | do_print_public(pw); | |
969 | if (resource_record_hostname != NULL) { | |
970 | do_print_resource_record(pw, resource_record_hostname); | |
971 | } | |
972 | if (reader_id != NULL) { | |
973 | #ifdef SMARTCARD | |
974 | if (download) | |
975 | do_download(pw, reader_id); | |
976 | else | |
977 | do_upload(pw, reader_id); | |
978 | #else /* SMARTCARD */ | |
979 | fatal("no support for smartcards."); | |
980 | #endif /* SMARTCARD */ | |
981 | } | |
982 | ||
983 | if (do_gen_candidates) { | |
984 | FILE *out = fopen(out_file, "w"); | |
985 | ||
986 | if (out == NULL) { | |
987 | error("Couldn't open modulus candidate file \"%s\": %s", | |
988 | out_file, strerror(errno)); | |
989 | return (1); | |
990 | } | |
991 | if (gen_candidates(out, memory, bits, start) != 0) | |
992 | fatal("modulus candidate generation failed\n"); | |
993 | ||
994 | return (0); | |
995 | } | |
996 | ||
997 | if (do_screen_candidates) { | |
998 | FILE *in; | |
999 | FILE *out = fopen(out_file, "w"); | |
1000 | ||
1001 | if (have_identity && strcmp(identity_file, "-") != 0) { | |
1002 | if ((in = fopen(identity_file, "r")) == NULL) { | |
1003 | fatal("Couldn't open modulus candidate " | |
1004 | "file \"%s\": %s", identity_file, | |
1005 | strerror(errno)); | |
1006 | } | |
1007 | } else | |
1008 | in = stdin; | |
1009 | ||
1010 | if (out == NULL) { | |
1011 | fatal("Couldn't open moduli file \"%s\": %s", | |
1012 | out_file, strerror(errno)); | |
1013 | } | |
1014 | if (prime_test(in, out, trials, generator_wanted) != 0) | |
1015 | fatal("modulus screening failed\n"); | |
1016 | return (0); | |
1017 | } | |
1018 | ||
1019 | arc4random_stir(); | |
1020 | ||
1021 | if (key_type_name == NULL) { | |
1022 | printf("You must specify a key type (-t).\n"); | |
1023 | usage(); | |
1024 | } | |
1025 | type = key_type_from_name(key_type_name); | |
1026 | if (type == KEY_UNSPEC) { | |
1027 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
1028 | exit(1); | |
1029 | } | |
1030 | if (!quiet) | |
1031 | printf("Generating public/private %s key pair.\n", key_type_name); | |
1032 | private = key_generate(type, bits); | |
1033 | if (private == NULL) { | |
1034 | fprintf(stderr, "key_generate failed"); | |
1035 | exit(1); | |
1036 | } | |
1037 | public = key_from_private(private); | |
1038 | ||
1039 | if (!have_identity) | |
1040 | ask_filename(pw, "Enter file in which to save the key"); | |
1041 | ||
1042 | /* Create ~/.ssh directory if it doesn\'t already exist. */ | |
1043 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
1044 | if (strstr(identity_file, dotsshdir) != NULL && | |
1045 | stat(dotsshdir, &st) < 0) { | |
1046 | if (mkdir(dotsshdir, 0700) < 0) | |
1047 | error("Could not create directory '%s'.", dotsshdir); | |
1048 | else if (!quiet) | |
1049 | printf("Created directory '%s'.\n", dotsshdir); | |
1050 | } | |
1051 | /* If the file already exists, ask the user to confirm. */ | |
1052 | if (stat(identity_file, &st) >= 0) { | |
1053 | char yesno[3]; | |
1054 | printf("%s already exists.\n", identity_file); | |
1055 | printf("Overwrite (y/n)? "); | |
1056 | fflush(stdout); | |
1057 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
1058 | exit(1); | |
1059 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
1060 | exit(1); | |
1061 | } | |
1062 | /* Ask for a passphrase (twice). */ | |
1063 | if (identity_passphrase) | |
1064 | passphrase1 = xstrdup(identity_passphrase); | |
1065 | else if (identity_new_passphrase) | |
1066 | passphrase1 = xstrdup(identity_new_passphrase); | |
1067 | else { | |
1068 | passphrase_again: | |
1069 | passphrase1 = | |
1070 | read_passphrase("Enter passphrase (empty for no " | |
1071 | "passphrase): ", RP_ALLOW_STDIN); | |
1072 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
1073 | RP_ALLOW_STDIN); | |
1074 | if (strcmp(passphrase1, passphrase2) != 0) { | |
1075 | /* | |
1076 | * The passphrases do not match. Clear them and | |
1077 | * retry. | |
1078 | */ | |
1079 | memset(passphrase1, 0, strlen(passphrase1)); | |
1080 | memset(passphrase2, 0, strlen(passphrase2)); | |
1081 | xfree(passphrase1); | |
1082 | xfree(passphrase2); | |
1083 | printf("Passphrases do not match. Try again.\n"); | |
1084 | goto passphrase_again; | |
1085 | } | |
1086 | /* Clear the other copy of the passphrase. */ | |
1087 | memset(passphrase2, 0, strlen(passphrase2)); | |
1088 | xfree(passphrase2); | |
1089 | } | |
1090 | ||
1091 | if (identity_comment) { | |
1092 | strlcpy(comment, identity_comment, sizeof(comment)); | |
1093 | } else { | |
1094 | /* Create default commend field for the passphrase. */ | |
1095 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
1096 | } | |
1097 | ||
1098 | /* Save the key with the given passphrase and comment. */ | |
1099 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
1100 | printf("Saving the key failed: %s.\n", identity_file); | |
1101 | memset(passphrase1, 0, strlen(passphrase1)); | |
1102 | xfree(passphrase1); | |
1103 | exit(1); | |
1104 | } | |
1105 | /* Clear the passphrase. */ | |
1106 | memset(passphrase1, 0, strlen(passphrase1)); | |
1107 | xfree(passphrase1); | |
1108 | ||
1109 | /* Clear the private key and the random number generator. */ | |
1110 | key_free(private); | |
1111 | arc4random_stir(); | |
1112 | ||
1113 | if (!quiet) | |
1114 | printf("Your identification has been saved in %s.\n", identity_file); | |
1115 | ||
1116 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1117 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1118 | if (fd == -1) { | |
1119 | printf("Could not save your public key in %s\n", identity_file); | |
1120 | exit(1); | |
1121 | } | |
1122 | f = fdopen(fd, "w"); | |
1123 | if (f == NULL) { | |
1124 | printf("fdopen %s failed", identity_file); | |
1125 | exit(1); | |
1126 | } | |
1127 | if (!key_write(public, f)) | |
1128 | fprintf(stderr, "write key failed"); | |
1129 | fprintf(f, " %s\n", comment); | |
1130 | fclose(f); | |
1131 | ||
1132 | if (!quiet) { | |
1133 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
1134 | printf("Your public key has been saved in %s.\n", | |
1135 | identity_file); | |
1136 | printf("The key fingerprint is:\n"); | |
1137 | printf("%s %s\n", fp, comment); | |
1138 | xfree(fp); | |
1139 | } | |
1140 | ||
1141 | key_free(public); | |
1142 | exit(0); | |
1143 | } |