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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 1.106 2003/05/15 03:10:52 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 | ||
31 | #ifdef SMARTCARD | |
32 | #include "scard.h" | |
33 | #endif | |
34 | #ifdef DNS | |
35 | #include "dns.h" | |
36 | #endif | |
37 | ||
38 | /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ | |
39 | int bits = 1024; | |
40 | ||
41 | /* | |
42 | * Flag indicating that we just want to change the passphrase. This can be | |
43 | * set on the command line. | |
44 | */ | |
45 | int change_passphrase = 0; | |
46 | ||
47 | /* | |
48 | * Flag indicating that we just want to change the comment. This can be set | |
49 | * on the command line. | |
50 | */ | |
51 | int change_comment = 0; | |
52 | ||
53 | int quiet = 0; | |
54 | ||
55 | /* Flag indicating that we just want to see the key fingerprint */ | |
56 | int print_fingerprint = 0; | |
57 | int print_bubblebabble = 0; | |
58 | ||
59 | /* The identity file name, given on the command line or entered by the user. */ | |
60 | char identity_file[1024]; | |
61 | int have_identity = 0; | |
62 | ||
63 | /* This is set to the passphrase if given on the command line. */ | |
64 | char *identity_passphrase = NULL; | |
65 | ||
66 | /* This is set to the new passphrase if given on the command line. */ | |
67 | char *identity_new_passphrase = NULL; | |
68 | ||
69 | /* This is set to the new comment if given on the command line. */ | |
70 | char *identity_comment = NULL; | |
71 | ||
72 | /* Dump public key file in format used by real and the original SSH 2 */ | |
73 | int convert_to_ssh2 = 0; | |
74 | int convert_from_ssh2 = 0; | |
75 | int print_public = 0; | |
76 | int print_generic = 0; | |
77 | ||
78 | char *key_type_name = NULL; | |
79 | ||
80 | /* argv0 */ | |
81 | #ifdef HAVE___PROGNAME | |
82 | extern char *__progname; | |
83 | #else | |
84 | char *__progname; | |
85 | #endif | |
86 | ||
87 | char hostname[MAXHOSTNAMELEN]; | |
88 | ||
89 | static void | |
90 | ask_filename(struct passwd *pw, const char *prompt) | |
91 | { | |
92 | char buf[1024]; | |
93 | char *name = NULL; | |
94 | ||
95 | if (key_type_name == NULL) | |
96 | name = _PATH_SSH_CLIENT_ID_RSA; | |
97 | else | |
98 | switch (key_type_from_name(key_type_name)) { | |
99 | case KEY_RSA1: | |
100 | name = _PATH_SSH_CLIENT_IDENTITY; | |
101 | break; | |
102 | case KEY_DSA: | |
103 | name = _PATH_SSH_CLIENT_ID_DSA; | |
104 | break; | |
105 | case KEY_RSA: | |
106 | name = _PATH_SSH_CLIENT_ID_RSA; | |
107 | break; | |
108 | default: | |
109 | fprintf(stderr, "bad key type"); | |
110 | exit(1); | |
111 | break; | |
112 | } | |
113 | ||
114 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); | |
115 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
116 | if (fgets(buf, sizeof(buf), stdin) == NULL) | |
117 | exit(1); | |
118 | if (strchr(buf, '\n')) | |
119 | *strchr(buf, '\n') = 0; | |
120 | if (strcmp(buf, "") != 0) | |
121 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
122 | have_identity = 1; | |
123 | } | |
124 | ||
125 | static Key * | |
126 | load_identity(char *filename) | |
127 | { | |
128 | char *pass; | |
129 | Key *prv; | |
130 | ||
131 | prv = key_load_private(filename, "", NULL); | |
132 | if (prv == NULL) { | |
133 | if (identity_passphrase) | |
134 | pass = xstrdup(identity_passphrase); | |
135 | else | |
136 | pass = read_passphrase("Enter passphrase: ", | |
137 | RP_ALLOW_STDIN); | |
138 | prv = key_load_private(filename, pass, NULL); | |
139 | memset(pass, 0, strlen(pass)); | |
140 | xfree(pass); | |
141 | } | |
142 | return prv; | |
143 | } | |
144 | ||
145 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
146 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" | |
147 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" | |
148 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
149 | ||
150 | static void | |
151 | do_convert_to_ssh2(struct passwd *pw) | |
152 | { | |
153 | Key *k; | |
154 | u_int len; | |
155 | u_char *blob; | |
156 | struct stat st; | |
157 | ||
158 | if (!have_identity) | |
159 | ask_filename(pw, "Enter file in which the key is"); | |
160 | if (stat(identity_file, &st) < 0) { | |
161 | perror(identity_file); | |
162 | exit(1); | |
163 | } | |
164 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
165 | if ((k = load_identity(identity_file)) == NULL) { | |
166 | fprintf(stderr, "load failed\n"); | |
167 | exit(1); | |
168 | } | |
169 | } | |
170 | if (k->type == KEY_RSA1) { | |
171 | fprintf(stderr, "version 1 keys are not supported\n"); | |
172 | exit(1); | |
173 | } | |
174 | if (key_to_blob(k, &blob, &len) <= 0) { | |
175 | fprintf(stderr, "key_to_blob failed\n"); | |
176 | exit(1); | |
177 | } | |
178 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
179 | fprintf(stdout, | |
180 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", | |
181 | key_size(k), key_type(k), | |
182 | pw->pw_name, hostname); | |
183 | dump_base64(stdout, blob, len); | |
184 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
185 | key_free(k); | |
186 | xfree(blob); | |
187 | exit(0); | |
188 | } | |
189 | ||
190 | static void | |
191 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
192 | { | |
193 | int bits = buffer_get_int(b); | |
194 | int bytes = (bits + 7) / 8; | |
195 | ||
196 | if (buffer_len(b) < bytes) | |
197 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
198 | "need %d have %d", bytes, buffer_len(b)); | |
199 | BN_bin2bn(buffer_ptr(b), bytes, value); | |
200 | buffer_consume(b, bytes); | |
201 | } | |
202 | ||
203 | static Key * | |
204 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) | |
205 | { | |
206 | Buffer b; | |
207 | Key *key = NULL; | |
208 | char *type, *cipher; | |
209 | u_char *sig, data[] = "abcde12345"; | |
210 | int magic, rlen, ktype, i1, i2, i3, i4; | |
211 | u_int slen; | |
212 | u_long e; | |
213 | ||
214 | buffer_init(&b); | |
215 | buffer_append(&b, blob, blen); | |
216 | ||
217 | magic = buffer_get_int(&b); | |
218 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
219 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
220 | buffer_free(&b); | |
221 | return NULL; | |
222 | } | |
223 | i1 = buffer_get_int(&b); | |
224 | type = buffer_get_string(&b, NULL); | |
225 | cipher = buffer_get_string(&b, NULL); | |
226 | i2 = buffer_get_int(&b); | |
227 | i3 = buffer_get_int(&b); | |
228 | i4 = buffer_get_int(&b); | |
229 | debug("ignore (%d %d %d %d)", i1,i2,i3,i4); | |
230 | if (strcmp(cipher, "none") != 0) { | |
231 | error("unsupported cipher %s", cipher); | |
232 | xfree(cipher); | |
233 | buffer_free(&b); | |
234 | xfree(type); | |
235 | return NULL; | |
236 | } | |
237 | xfree(cipher); | |
238 | ||
239 | if (strstr(type, "dsa")) { | |
240 | ktype = KEY_DSA; | |
241 | } else if (strstr(type, "rsa")) { | |
242 | ktype = KEY_RSA; | |
243 | } else { | |
244 | xfree(type); | |
245 | return NULL; | |
246 | } | |
247 | key = key_new_private(ktype); | |
248 | xfree(type); | |
249 | ||
250 | switch (key->type) { | |
251 | case KEY_DSA: | |
252 | buffer_get_bignum_bits(&b, key->dsa->p); | |
253 | buffer_get_bignum_bits(&b, key->dsa->g); | |
254 | buffer_get_bignum_bits(&b, key->dsa->q); | |
255 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
256 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
257 | break; | |
258 | case KEY_RSA: | |
259 | e = buffer_get_char(&b); | |
260 | debug("e %lx", e); | |
261 | if (e < 30) { | |
262 | e <<= 8; | |
263 | e += buffer_get_char(&b); | |
264 | debug("e %lx", e); | |
265 | e <<= 8; | |
266 | e += buffer_get_char(&b); | |
267 | debug("e %lx", e); | |
268 | } | |
269 | if (!BN_set_word(key->rsa->e, e)) { | |
270 | buffer_free(&b); | |
271 | key_free(key); | |
272 | return NULL; | |
273 | } | |
274 | buffer_get_bignum_bits(&b, key->rsa->d); | |
275 | buffer_get_bignum_bits(&b, key->rsa->n); | |
276 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
277 | buffer_get_bignum_bits(&b, key->rsa->q); | |
278 | buffer_get_bignum_bits(&b, key->rsa->p); | |
279 | rsa_generate_additional_parameters(key->rsa); | |
280 | break; | |
281 | } | |
282 | rlen = buffer_len(&b); | |
283 | if (rlen != 0) | |
284 | error("do_convert_private_ssh2_from_blob: " | |
285 | "remaining bytes in key blob %d", rlen); | |
286 | buffer_free(&b); | |
287 | ||
288 | /* try the key */ | |
289 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
290 | key_verify(key, sig, slen, data, sizeof(data)); | |
291 | xfree(sig); | |
292 | return key; | |
293 | } | |
294 | ||
295 | static void | |
296 | do_convert_from_ssh2(struct passwd *pw) | |
297 | { | |
298 | Key *k; | |
299 | int blen; | |
300 | u_int len; | |
301 | char line[1024], *p; | |
302 | u_char blob[8096]; | |
303 | char encoded[8096]; | |
304 | struct stat st; | |
305 | int escaped = 0, private = 0, ok; | |
306 | FILE *fp; | |
307 | ||
308 | if (!have_identity) | |
309 | ask_filename(pw, "Enter file in which the key is"); | |
310 | if (stat(identity_file, &st) < 0) { | |
311 | perror(identity_file); | |
312 | exit(1); | |
313 | } | |
314 | fp = fopen(identity_file, "r"); | |
315 | if (fp == NULL) { | |
316 | perror(identity_file); | |
317 | exit(1); | |
318 | } | |
319 | encoded[0] = '\0'; | |
320 | while (fgets(line, sizeof(line), fp)) { | |
321 | if (!(p = strchr(line, '\n'))) { | |
322 | fprintf(stderr, "input line too long.\n"); | |
323 | exit(1); | |
324 | } | |
325 | if (p > line && p[-1] == '\\') | |
326 | escaped++; | |
327 | if (strncmp(line, "----", 4) == 0 || | |
328 | strstr(line, ": ") != NULL) { | |
329 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
330 | private = 1; | |
331 | if (strstr(line, " END ") != NULL) { | |
332 | break; | |
333 | } | |
334 | /* fprintf(stderr, "ignore: %s", line); */ | |
335 | continue; | |
336 | } | |
337 | if (escaped) { | |
338 | escaped--; | |
339 | /* fprintf(stderr, "escaped: %s", line); */ | |
340 | continue; | |
341 | } | |
342 | *p = '\0'; | |
343 | strlcat(encoded, line, sizeof(encoded)); | |
344 | } | |
345 | len = strlen(encoded); | |
346 | if (((len % 4) == 3) && | |
347 | (encoded[len-1] == '=') && | |
348 | (encoded[len-2] == '=') && | |
349 | (encoded[len-3] == '=')) | |
350 | encoded[len-3] = '\0'; | |
351 | blen = uudecode(encoded, blob, sizeof(blob)); | |
352 | if (blen < 0) { | |
353 | fprintf(stderr, "uudecode failed.\n"); | |
354 | exit(1); | |
355 | } | |
356 | k = private ? | |
357 | do_convert_private_ssh2_from_blob(blob, blen) : | |
358 | key_from_blob(blob, blen); | |
359 | if (k == NULL) { | |
360 | fprintf(stderr, "decode blob failed.\n"); | |
361 | exit(1); | |
362 | } | |
363 | ok = private ? | |
364 | (k->type == KEY_DSA ? | |
365 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
366 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
367 | key_write(k, stdout); | |
368 | if (!ok) { | |
369 | fprintf(stderr, "key write failed"); | |
370 | exit(1); | |
371 | } | |
372 | key_free(k); | |
373 | if (!private) | |
374 | fprintf(stdout, "\n"); | |
375 | fclose(fp); | |
376 | exit(0); | |
377 | } | |
378 | ||
379 | static void | |
380 | do_print_public(struct passwd *pw) | |
381 | { | |
382 | Key *prv; | |
383 | struct stat st; | |
384 | ||
385 | if (!have_identity) | |
386 | ask_filename(pw, "Enter file in which the key is"); | |
387 | if (stat(identity_file, &st) < 0) { | |
388 | perror(identity_file); | |
389 | exit(1); | |
390 | } | |
391 | prv = load_identity(identity_file); | |
392 | if (prv == NULL) { | |
393 | fprintf(stderr, "load failed\n"); | |
394 | exit(1); | |
395 | } | |
396 | if (!key_write(prv, stdout)) | |
397 | fprintf(stderr, "key_write failed"); | |
398 | key_free(prv); | |
399 | fprintf(stdout, "\n"); | |
400 | exit(0); | |
401 | } | |
402 | ||
403 | #ifdef SMARTCARD | |
404 | static void | |
405 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
406 | { | |
407 | Key *prv = NULL; | |
408 | struct stat st; | |
409 | int ret; | |
410 | ||
411 | if (!have_identity) | |
412 | ask_filename(pw, "Enter file in which the key is"); | |
413 | if (stat(identity_file, &st) < 0) { | |
414 | perror(identity_file); | |
415 | exit(1); | |
416 | } | |
417 | prv = load_identity(identity_file); | |
418 | if (prv == NULL) { | |
419 | error("load failed"); | |
420 | exit(1); | |
421 | } | |
422 | ret = sc_put_key(prv, sc_reader_id); | |
423 | key_free(prv); | |
424 | if (ret < 0) | |
425 | exit(1); | |
426 | logit("loading key done"); | |
427 | exit(0); | |
428 | } | |
429 | ||
430 | static void | |
431 | do_download(struct passwd *pw, const char *sc_reader_id) | |
432 | { | |
433 | Key **keys = NULL; | |
434 | int i; | |
435 | ||
436 | keys = sc_get_keys(sc_reader_id, NULL); | |
437 | if (keys == NULL) | |
438 | fatal("cannot read public key from smartcard"); | |
439 | for (i = 0; keys[i]; i++) { | |
440 | key_write(keys[i], stdout); | |
441 | key_free(keys[i]); | |
442 | fprintf(stdout, "\n"); | |
443 | } | |
444 | xfree(keys); | |
445 | exit(0); | |
446 | } | |
447 | #endif /* SMARTCARD */ | |
448 | ||
449 | static void | |
450 | do_fingerprint(struct passwd *pw) | |
451 | { | |
452 | FILE *f; | |
453 | Key *public; | |
454 | char *comment = NULL, *cp, *ep, line[16*1024], *fp; | |
455 | int i, skip = 0, num = 1, invalid = 1; | |
456 | enum fp_rep rep; | |
457 | enum fp_type fptype; | |
458 | struct stat st; | |
459 | ||
460 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
461 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
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 | public = key_load_public(identity_file, &comment); | |
470 | if (public != NULL) { | |
471 | fp = key_fingerprint(public, fptype, rep); | |
472 | printf("%u %s %s\n", key_size(public), fp, comment); | |
473 | key_free(public); | |
474 | xfree(comment); | |
475 | xfree(fp); | |
476 | exit(0); | |
477 | } | |
478 | if (comment) | |
479 | xfree(comment); | |
480 | ||
481 | f = fopen(identity_file, "r"); | |
482 | if (f != NULL) { | |
483 | while (fgets(line, sizeof(line), f)) { | |
484 | i = strlen(line) - 1; | |
485 | if (line[i] != '\n') { | |
486 | error("line %d too long: %.40s...", num, line); | |
487 | skip = 1; | |
488 | continue; | |
489 | } | |
490 | num++; | |
491 | if (skip) { | |
492 | skip = 0; | |
493 | continue; | |
494 | } | |
495 | line[i] = '\0'; | |
496 | ||
497 | /* Skip leading whitespace, empty and comment lines. */ | |
498 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
499 | ; | |
500 | if (!*cp || *cp == '\n' || *cp == '#') | |
501 | continue ; | |
502 | i = strtol(cp, &ep, 10); | |
503 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
504 | int quoted = 0; | |
505 | comment = cp; | |
506 | for (; *cp && (quoted || (*cp != ' ' && | |
507 | *cp != '\t')); cp++) { | |
508 | if (*cp == '\\' && cp[1] == '"') | |
509 | cp++; /* Skip both */ | |
510 | else if (*cp == '"') | |
511 | quoted = !quoted; | |
512 | } | |
513 | if (!*cp) | |
514 | continue; | |
515 | *cp++ = '\0'; | |
516 | } | |
517 | ep = cp; | |
518 | public = key_new(KEY_RSA1); | |
519 | if (key_read(public, &cp) != 1) { | |
520 | cp = ep; | |
521 | key_free(public); | |
522 | public = key_new(KEY_UNSPEC); | |
523 | if (key_read(public, &cp) != 1) { | |
524 | key_free(public); | |
525 | continue; | |
526 | } | |
527 | } | |
528 | comment = *cp ? cp : comment; | |
529 | fp = key_fingerprint(public, fptype, rep); | |
530 | printf("%u %s %s\n", key_size(public), fp, | |
531 | comment ? comment : "no comment"); | |
532 | xfree(fp); | |
533 | key_free(public); | |
534 | invalid = 0; | |
535 | } | |
536 | fclose(f); | |
537 | } | |
538 | if (invalid) { | |
539 | printf("%s is not a public key file.\n", identity_file); | |
540 | exit(1); | |
541 | } | |
542 | exit(0); | |
543 | } | |
544 | ||
545 | /* | |
546 | * Perform changing a passphrase. The argument is the passwd structure | |
547 | * for the current user. | |
548 | */ | |
549 | static void | |
550 | do_change_passphrase(struct passwd *pw) | |
551 | { | |
552 | char *comment; | |
553 | char *old_passphrase, *passphrase1, *passphrase2; | |
554 | struct stat st; | |
555 | Key *private; | |
556 | ||
557 | if (!have_identity) | |
558 | ask_filename(pw, "Enter file in which the key is"); | |
559 | if (stat(identity_file, &st) < 0) { | |
560 | perror(identity_file); | |
561 | exit(1); | |
562 | } | |
563 | /* Try to load the file with empty passphrase. */ | |
564 | private = key_load_private(identity_file, "", &comment); | |
565 | if (private == NULL) { | |
566 | if (identity_passphrase) | |
567 | old_passphrase = xstrdup(identity_passphrase); | |
568 | else | |
569 | old_passphrase = | |
570 | read_passphrase("Enter old passphrase: ", | |
571 | RP_ALLOW_STDIN); | |
572 | private = key_load_private(identity_file, old_passphrase, | |
573 | &comment); | |
574 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
575 | xfree(old_passphrase); | |
576 | if (private == NULL) { | |
577 | printf("Bad passphrase.\n"); | |
578 | exit(1); | |
579 | } | |
580 | } | |
581 | printf("Key has comment '%s'\n", comment); | |
582 | ||
583 | /* Ask the new passphrase (twice). */ | |
584 | if (identity_new_passphrase) { | |
585 | passphrase1 = xstrdup(identity_new_passphrase); | |
586 | passphrase2 = NULL; | |
587 | } else { | |
588 | passphrase1 = | |
589 | read_passphrase("Enter new passphrase (empty for no " | |
590 | "passphrase): ", RP_ALLOW_STDIN); | |
591 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
592 | RP_ALLOW_STDIN); | |
593 | ||
594 | /* Verify that they are the same. */ | |
595 | if (strcmp(passphrase1, passphrase2) != 0) { | |
596 | memset(passphrase1, 0, strlen(passphrase1)); | |
597 | memset(passphrase2, 0, strlen(passphrase2)); | |
598 | xfree(passphrase1); | |
599 | xfree(passphrase2); | |
600 | printf("Pass phrases do not match. Try again.\n"); | |
601 | exit(1); | |
602 | } | |
603 | /* Destroy the other copy. */ | |
604 | memset(passphrase2, 0, strlen(passphrase2)); | |
605 | xfree(passphrase2); | |
606 | } | |
607 | ||
608 | /* Save the file using the new passphrase. */ | |
609 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
610 | printf("Saving the key failed: %s.\n", identity_file); | |
611 | memset(passphrase1, 0, strlen(passphrase1)); | |
612 | xfree(passphrase1); | |
613 | key_free(private); | |
614 | xfree(comment); | |
615 | exit(1); | |
616 | } | |
617 | /* Destroy the passphrase and the copy of the key in memory. */ | |
618 | memset(passphrase1, 0, strlen(passphrase1)); | |
619 | xfree(passphrase1); | |
620 | key_free(private); /* Destroys contents */ | |
621 | xfree(comment); | |
622 | ||
623 | printf("Your identification has been saved with the new passphrase.\n"); | |
624 | exit(0); | |
625 | } | |
626 | ||
627 | #ifdef DNS | |
628 | /* | |
629 | * Print the SSHFP RR. | |
630 | */ | |
631 | static void | |
632 | do_print_resource_record(struct passwd *pw, char *hostname) | |
633 | { | |
634 | Key *public; | |
635 | char *comment = NULL; | |
636 | struct stat st; | |
637 | ||
638 | if (!have_identity) | |
639 | ask_filename(pw, "Enter file in which the key is"); | |
640 | if (stat(identity_file, &st) < 0) { | |
641 | perror(identity_file); | |
642 | exit(1); | |
643 | } | |
644 | public = key_load_public(identity_file, &comment); | |
645 | if (public != NULL) { | |
646 | export_dns_rr(hostname, public, stdout, print_generic); | |
647 | key_free(public); | |
648 | xfree(comment); | |
649 | exit(0); | |
650 | } | |
651 | if (comment) | |
652 | xfree(comment); | |
653 | ||
654 | printf("failed to read v2 public key from %s.\n", identity_file); | |
655 | exit(1); | |
656 | } | |
657 | #endif /* DNS */ | |
658 | ||
659 | /* | |
660 | * Change the comment of a private key file. | |
661 | */ | |
662 | static void | |
663 | do_change_comment(struct passwd *pw) | |
664 | { | |
665 | char new_comment[1024], *comment, *passphrase; | |
666 | Key *private; | |
667 | Key *public; | |
668 | struct stat st; | |
669 | FILE *f; | |
670 | int fd; | |
671 | ||
672 | if (!have_identity) | |
673 | ask_filename(pw, "Enter file in which the key is"); | |
674 | if (stat(identity_file, &st) < 0) { | |
675 | perror(identity_file); | |
676 | exit(1); | |
677 | } | |
678 | private = key_load_private(identity_file, "", &comment); | |
679 | if (private == NULL) { | |
680 | if (identity_passphrase) | |
681 | passphrase = xstrdup(identity_passphrase); | |
682 | else if (identity_new_passphrase) | |
683 | passphrase = xstrdup(identity_new_passphrase); | |
684 | else | |
685 | passphrase = read_passphrase("Enter passphrase: ", | |
686 | RP_ALLOW_STDIN); | |
687 | /* Try to load using the passphrase. */ | |
688 | private = key_load_private(identity_file, passphrase, &comment); | |
689 | if (private == NULL) { | |
690 | memset(passphrase, 0, strlen(passphrase)); | |
691 | xfree(passphrase); | |
692 | printf("Bad passphrase.\n"); | |
693 | exit(1); | |
694 | } | |
695 | } else { | |
696 | passphrase = xstrdup(""); | |
697 | } | |
698 | if (private->type != KEY_RSA1) { | |
699 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
700 | key_free(private); | |
701 | exit(1); | |
702 | } | |
703 | printf("Key now has comment '%s'\n", comment); | |
704 | ||
705 | if (identity_comment) { | |
706 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
707 | } else { | |
708 | printf("Enter new comment: "); | |
709 | fflush(stdout); | |
710 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
711 | memset(passphrase, 0, strlen(passphrase)); | |
712 | key_free(private); | |
713 | exit(1); | |
714 | } | |
715 | if (strchr(new_comment, '\n')) | |
716 | *strchr(new_comment, '\n') = 0; | |
717 | } | |
718 | ||
719 | /* Save the file using the new passphrase. */ | |
720 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
721 | printf("Saving the key failed: %s.\n", identity_file); | |
722 | memset(passphrase, 0, strlen(passphrase)); | |
723 | xfree(passphrase); | |
724 | key_free(private); | |
725 | xfree(comment); | |
726 | exit(1); | |
727 | } | |
728 | memset(passphrase, 0, strlen(passphrase)); | |
729 | xfree(passphrase); | |
730 | public = key_from_private(private); | |
731 | key_free(private); | |
732 | ||
733 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
734 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
735 | if (fd == -1) { | |
736 | printf("Could not save your public key in %s\n", identity_file); | |
737 | exit(1); | |
738 | } | |
739 | f = fdopen(fd, "w"); | |
740 | if (f == NULL) { | |
741 | printf("fdopen %s failed", identity_file); | |
742 | exit(1); | |
743 | } | |
744 | if (!key_write(public, f)) | |
745 | fprintf(stderr, "write key failed"); | |
746 | key_free(public); | |
747 | fprintf(f, " %s\n", new_comment); | |
748 | fclose(f); | |
749 | ||
750 | xfree(comment); | |
751 | ||
752 | printf("The comment in your key file has been changed.\n"); | |
753 | exit(0); | |
754 | } | |
755 | ||
756 | static void | |
757 | usage(void) | |
758 | { | |
759 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
760 | fprintf(stderr, "Options:\n"); | |
761 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
762 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
763 | fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); | |
764 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
765 | fprintf(stderr, " -g Use generic DNS resource record format.\n"); | |
766 | fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); | |
767 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
768 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
769 | fprintf(stderr, " -q Quiet.\n"); | |
770 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
771 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
772 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
773 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
774 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
775 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
776 | #ifdef DNS | |
777 | fprintf(stderr, " -r hostname Print DNS resource record.\n"); | |
778 | #endif /* DNS */ | |
779 | #ifdef SMARTCARD | |
780 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
781 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
782 | #endif /* SMARTCARD */ | |
783 | ||
784 | exit(1); | |
785 | } | |
786 | ||
787 | /* | |
788 | * Main program for key management. | |
789 | */ | |
790 | int | |
791 | main(int ac, char **av) | |
792 | { | |
793 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; | |
794 | char *reader_id = NULL; | |
795 | char *resource_record_hostname = NULL; | |
796 | Key *private, *public; | |
797 | struct passwd *pw; | |
798 | struct stat st; | |
799 | int opt, type, fd, download = 0; | |
800 | FILE *f; | |
801 | ||
802 | extern int optind; | |
803 | extern char *optarg; | |
804 | ||
805 | __progname = get_progname(av[0]); | |
806 | ||
807 | SSLeay_add_all_algorithms(); | |
808 | init_rng(); | |
809 | seed_rng(); | |
810 | ||
811 | /* we need this for the home * directory. */ | |
812 | pw = getpwuid(getuid()); | |
813 | if (!pw) { | |
814 | printf("You don't exist, go away!\n"); | |
815 | exit(1); | |
816 | } | |
817 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
818 | perror("gethostname"); | |
819 | exit(1); | |
820 | } | |
821 | ||
822 | while ((opt = getopt(ac, av, "degiqpclBRxXyb:f:t:U:D:P:N:C:r:")) != -1) { | |
823 | switch (opt) { | |
824 | case 'b': | |
825 | bits = atoi(optarg); | |
826 | if (bits < 512 || bits > 32768) { | |
827 | printf("Bits has bad value.\n"); | |
828 | exit(1); | |
829 | } | |
830 | break; | |
831 | case 'l': | |
832 | print_fingerprint = 1; | |
833 | break; | |
834 | case 'B': | |
835 | print_bubblebabble = 1; | |
836 | break; | |
837 | case 'p': | |
838 | change_passphrase = 1; | |
839 | break; | |
840 | case 'c': | |
841 | change_comment = 1; | |
842 | break; | |
843 | case 'f': | |
844 | strlcpy(identity_file, optarg, sizeof(identity_file)); | |
845 | have_identity = 1; | |
846 | break; | |
847 | case 'g': | |
848 | print_generic = 1; | |
849 | break; | |
850 | case 'P': | |
851 | identity_passphrase = optarg; | |
852 | break; | |
853 | case 'N': | |
854 | identity_new_passphrase = optarg; | |
855 | break; | |
856 | case 'C': | |
857 | identity_comment = optarg; | |
858 | break; | |
859 | case 'q': | |
860 | quiet = 1; | |
861 | break; | |
862 | case 'R': | |
863 | /* unused */ | |
864 | exit(0); | |
865 | break; | |
866 | case 'e': | |
867 | case 'x': | |
868 | /* export key */ | |
869 | convert_to_ssh2 = 1; | |
870 | break; | |
871 | case 'i': | |
872 | case 'X': | |
873 | /* import key */ | |
874 | convert_from_ssh2 = 1; | |
875 | break; | |
876 | case 'y': | |
877 | print_public = 1; | |
878 | break; | |
879 | case 'd': | |
880 | key_type_name = "dsa"; | |
881 | break; | |
882 | case 't': | |
883 | key_type_name = optarg; | |
884 | break; | |
885 | case 'D': | |
886 | download = 1; | |
887 | case 'U': | |
888 | reader_id = optarg; | |
889 | break; | |
890 | case 'r': | |
891 | resource_record_hostname = optarg; | |
892 | break; | |
893 | case '?': | |
894 | default: | |
895 | usage(); | |
896 | } | |
897 | } | |
898 | if (optind < ac) { | |
899 | printf("Too many arguments.\n"); | |
900 | usage(); | |
901 | } | |
902 | if (change_passphrase && change_comment) { | |
903 | printf("Can only have one of -p and -c.\n"); | |
904 | usage(); | |
905 | } | |
906 | if (print_fingerprint || print_bubblebabble) | |
907 | do_fingerprint(pw); | |
908 | if (change_passphrase) | |
909 | do_change_passphrase(pw); | |
910 | if (change_comment) | |
911 | do_change_comment(pw); | |
912 | if (convert_to_ssh2) | |
913 | do_convert_to_ssh2(pw); | |
914 | if (convert_from_ssh2) | |
915 | do_convert_from_ssh2(pw); | |
916 | if (print_public) | |
917 | do_print_public(pw); | |
918 | if (resource_record_hostname != NULL) { | |
919 | #ifdef DNS | |
920 | do_print_resource_record(pw, resource_record_hostname); | |
921 | #else /* DNS */ | |
922 | fatal("no DNS support."); | |
923 | #endif /* DNS */ | |
924 | } | |
925 | if (reader_id != NULL) { | |
926 | #ifdef SMARTCARD | |
927 | if (download) | |
928 | do_download(pw, reader_id); | |
929 | else | |
930 | do_upload(pw, reader_id); | |
931 | #else /* SMARTCARD */ | |
932 | fatal("no support for smartcards."); | |
933 | #endif /* SMARTCARD */ | |
934 | } | |
935 | ||
936 | arc4random_stir(); | |
937 | ||
938 | if (key_type_name == NULL) { | |
939 | printf("You must specify a key type (-t).\n"); | |
940 | usage(); | |
941 | } | |
942 | type = key_type_from_name(key_type_name); | |
943 | if (type == KEY_UNSPEC) { | |
944 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
945 | exit(1); | |
946 | } | |
947 | if (!quiet) | |
948 | printf("Generating public/private %s key pair.\n", key_type_name); | |
949 | private = key_generate(type, bits); | |
950 | if (private == NULL) { | |
951 | fprintf(stderr, "key_generate failed"); | |
952 | exit(1); | |
953 | } | |
954 | public = key_from_private(private); | |
955 | ||
956 | if (!have_identity) | |
957 | ask_filename(pw, "Enter file in which to save the key"); | |
958 | ||
959 | /* Create ~/.ssh directory if it doesn\'t already exist. */ | |
960 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
961 | if (strstr(identity_file, dotsshdir) != NULL && | |
962 | stat(dotsshdir, &st) < 0) { | |
963 | if (mkdir(dotsshdir, 0700) < 0) | |
964 | error("Could not create directory '%s'.", dotsshdir); | |
965 | else if (!quiet) | |
966 | printf("Created directory '%s'.\n", dotsshdir); | |
967 | } | |
968 | /* If the file already exists, ask the user to confirm. */ | |
969 | if (stat(identity_file, &st) >= 0) { | |
970 | char yesno[3]; | |
971 | printf("%s already exists.\n", identity_file); | |
972 | printf("Overwrite (y/n)? "); | |
973 | fflush(stdout); | |
974 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
975 | exit(1); | |
976 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
977 | exit(1); | |
978 | } | |
979 | /* Ask for a passphrase (twice). */ | |
980 | if (identity_passphrase) | |
981 | passphrase1 = xstrdup(identity_passphrase); | |
982 | else if (identity_new_passphrase) | |
983 | passphrase1 = xstrdup(identity_new_passphrase); | |
984 | else { | |
985 | passphrase_again: | |
986 | passphrase1 = | |
987 | read_passphrase("Enter passphrase (empty for no " | |
988 | "passphrase): ", RP_ALLOW_STDIN); | |
989 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
990 | RP_ALLOW_STDIN); | |
991 | if (strcmp(passphrase1, passphrase2) != 0) { | |
992 | /* | |
993 | * The passphrases do not match. Clear them and | |
994 | * retry. | |
995 | */ | |
996 | memset(passphrase1, 0, strlen(passphrase1)); | |
997 | memset(passphrase2, 0, strlen(passphrase2)); | |
998 | xfree(passphrase1); | |
999 | xfree(passphrase2); | |
1000 | printf("Passphrases do not match. Try again.\n"); | |
1001 | goto passphrase_again; | |
1002 | } | |
1003 | /* Clear the other copy of the passphrase. */ | |
1004 | memset(passphrase2, 0, strlen(passphrase2)); | |
1005 | xfree(passphrase2); | |
1006 | } | |
1007 | ||
1008 | if (identity_comment) { | |
1009 | strlcpy(comment, identity_comment, sizeof(comment)); | |
1010 | } else { | |
1011 | /* Create default commend field for the passphrase. */ | |
1012 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
1013 | } | |
1014 | ||
1015 | /* Save the key with the given passphrase and comment. */ | |
1016 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
1017 | printf("Saving the key failed: %s.\n", identity_file); | |
1018 | memset(passphrase1, 0, strlen(passphrase1)); | |
1019 | xfree(passphrase1); | |
1020 | exit(1); | |
1021 | } | |
1022 | /* Clear the passphrase. */ | |
1023 | memset(passphrase1, 0, strlen(passphrase1)); | |
1024 | xfree(passphrase1); | |
1025 | ||
1026 | /* Clear the private key and the random number generator. */ | |
1027 | key_free(private); | |
1028 | arc4random_stir(); | |
1029 | ||
1030 | if (!quiet) | |
1031 | printf("Your identification has been saved in %s.\n", identity_file); | |
1032 | ||
1033 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1034 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1035 | if (fd == -1) { | |
1036 | printf("Could not save your public key in %s\n", identity_file); | |
1037 | exit(1); | |
1038 | } | |
1039 | f = fdopen(fd, "w"); | |
1040 | if (f == NULL) { | |
1041 | printf("fdopen %s failed", identity_file); | |
1042 | exit(1); | |
1043 | } | |
1044 | if (!key_write(public, f)) | |
1045 | fprintf(stderr, "write key failed"); | |
1046 | fprintf(f, " %s\n", comment); | |
1047 | fclose(f); | |
1048 | ||
1049 | if (!quiet) { | |
1050 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
1051 | printf("Your public key has been saved in %s.\n", | |
1052 | identity_file); | |
1053 | printf("The key fingerprint is:\n"); | |
1054 | printf("%s %s\n", fp, comment); | |
1055 | xfree(fp); | |
1056 | } | |
1057 | ||
1058 | key_free(public); | |
1059 | exit(0); | |
1060 | } |