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3c0ef626 | 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" | |
9cb1827b | 15 | RCSID("$OpenBSD: ssh-keygen.c,v 1.108 2003/08/14 16:08:58 markus Exp $"); |
3c0ef626 | 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" | |
0fff78ff | 30 | #include "moduli.h" |
3c0ef626 | 31 | |
32 | #ifdef SMARTCARD | |
3c0ef626 | 33 | #include "scard.h" |
34 | #endif | |
9cb1827b | 35 | #ifdef DNS |
0fff78ff | 36 | #include "dns.h" |
9cb1827b | 37 | #endif |
3c0ef626 | 38 | |
39 | /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ | |
40 | int bits = 1024; | |
41 | ||
42 | /* | |
43 | * Flag indicating that we just want to change the passphrase. This can be | |
44 | * set on the command line. | |
45 | */ | |
46 | int change_passphrase = 0; | |
47 | ||
48 | /* | |
49 | * Flag indicating that we just want to change the comment. This can be set | |
50 | * on the command line. | |
51 | */ | |
52 | int change_comment = 0; | |
53 | ||
54 | int quiet = 0; | |
55 | ||
56 | /* Flag indicating that we just want to see the key fingerprint */ | |
57 | int print_fingerprint = 0; | |
58 | int print_bubblebabble = 0; | |
59 | ||
60 | /* The identity file name, given on the command line or entered by the user. */ | |
61 | char identity_file[1024]; | |
62 | int have_identity = 0; | |
63 | ||
64 | /* This is set to the passphrase if given on the command line. */ | |
65 | char *identity_passphrase = NULL; | |
66 | ||
67 | /* This is set to the new passphrase if given on the command line. */ | |
68 | char *identity_new_passphrase = NULL; | |
69 | ||
70 | /* This is set to the new comment if given on the command line. */ | |
71 | char *identity_comment = NULL; | |
72 | ||
73 | /* Dump public key file in format used by real and the original SSH 2 */ | |
74 | int convert_to_ssh2 = 0; | |
75 | int convert_from_ssh2 = 0; | |
76 | int print_public = 0; | |
0fff78ff | 77 | int print_generic = 0; |
3c0ef626 | 78 | |
e9a17296 | 79 | char *key_type_name = NULL; |
3c0ef626 | 80 | |
81 | /* argv0 */ | |
82 | #ifdef HAVE___PROGNAME | |
83 | extern char *__progname; | |
84 | #else | |
85 | char *__progname; | |
86 | #endif | |
87 | ||
88 | char hostname[MAXHOSTNAMELEN]; | |
89 | ||
90 | static void | |
91 | ask_filename(struct passwd *pw, const char *prompt) | |
92 | { | |
93 | char buf[1024]; | |
94 | char *name = NULL; | |
95 | ||
e9a17296 | 96 | if (key_type_name == NULL) |
3c0ef626 | 97 | name = _PATH_SSH_CLIENT_ID_RSA; |
e9a17296 | 98 | else |
99 | switch (key_type_from_name(key_type_name)) { | |
100 | case KEY_RSA1: | |
101 | name = _PATH_SSH_CLIENT_IDENTITY; | |
102 | break; | |
103 | case KEY_DSA: | |
104 | name = _PATH_SSH_CLIENT_ID_DSA; | |
105 | break; | |
106 | case KEY_RSA: | |
107 | name = _PATH_SSH_CLIENT_ID_RSA; | |
108 | break; | |
109 | default: | |
110 | fprintf(stderr, "bad key type"); | |
111 | exit(1); | |
112 | break; | |
113 | } | |
114 | ||
3c0ef626 | 115 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); |
116 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
3c0ef626 | 117 | if (fgets(buf, sizeof(buf), stdin) == NULL) |
118 | exit(1); | |
119 | if (strchr(buf, '\n')) | |
120 | *strchr(buf, '\n') = 0; | |
121 | if (strcmp(buf, "") != 0) | |
122 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
123 | have_identity = 1; | |
124 | } | |
125 | ||
126 | static Key * | |
127 | load_identity(char *filename) | |
128 | { | |
129 | char *pass; | |
130 | Key *prv; | |
131 | ||
132 | prv = key_load_private(filename, "", NULL); | |
133 | if (prv == NULL) { | |
134 | if (identity_passphrase) | |
135 | pass = xstrdup(identity_passphrase); | |
136 | else | |
137 | pass = read_passphrase("Enter passphrase: ", | |
138 | RP_ALLOW_STDIN); | |
139 | prv = key_load_private(filename, pass, NULL); | |
140 | memset(pass, 0, strlen(pass)); | |
141 | xfree(pass); | |
142 | } | |
143 | return prv; | |
144 | } | |
145 | ||
146 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
f5799ae1 | 147 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" |
3c0ef626 | 148 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" |
149 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
150 | ||
151 | static void | |
152 | do_convert_to_ssh2(struct passwd *pw) | |
153 | { | |
154 | Key *k; | |
e9a17296 | 155 | u_int len; |
3c0ef626 | 156 | u_char *blob; |
157 | struct stat st; | |
158 | ||
159 | if (!have_identity) | |
160 | ask_filename(pw, "Enter file in which the key is"); | |
161 | if (stat(identity_file, &st) < 0) { | |
162 | perror(identity_file); | |
163 | exit(1); | |
164 | } | |
165 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
166 | if ((k = load_identity(identity_file)) == NULL) { | |
167 | fprintf(stderr, "load failed\n"); | |
168 | exit(1); | |
169 | } | |
170 | } | |
0fff78ff | 171 | if (k->type == KEY_RSA1) { |
172 | fprintf(stderr, "version 1 keys are not supported\n"); | |
173 | exit(1); | |
174 | } | |
3c0ef626 | 175 | if (key_to_blob(k, &blob, &len) <= 0) { |
176 | fprintf(stderr, "key_to_blob failed\n"); | |
177 | exit(1); | |
178 | } | |
179 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
180 | fprintf(stdout, | |
680cee3b | 181 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", |
3c0ef626 | 182 | key_size(k), key_type(k), |
183 | pw->pw_name, hostname); | |
184 | dump_base64(stdout, blob, len); | |
185 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
186 | key_free(k); | |
187 | xfree(blob); | |
188 | exit(0); | |
189 | } | |
190 | ||
191 | static void | |
192 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
193 | { | |
9cb1827b | 194 | int bits = buffer_get_int(b); |
195 | int bytes = (bits + 7) / 8; | |
3c0ef626 | 196 | |
197 | if (buffer_len(b) < bytes) | |
198 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
199 | "need %d have %d", bytes, buffer_len(b)); | |
e9a17296 | 200 | BN_bin2bn(buffer_ptr(b), bytes, value); |
3c0ef626 | 201 | buffer_consume(b, bytes); |
202 | } | |
203 | ||
204 | static Key * | |
e9a17296 | 205 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) |
3c0ef626 | 206 | { |
207 | Buffer b; | |
208 | Key *key = NULL; | |
209 | char *type, *cipher; | |
210 | u_char *sig, data[] = "abcde12345"; | |
211 | int magic, rlen, ktype, i1, i2, i3, i4; | |
212 | u_int slen; | |
213 | u_long e; | |
214 | ||
215 | buffer_init(&b); | |
216 | buffer_append(&b, blob, blen); | |
217 | ||
218 | magic = buffer_get_int(&b); | |
219 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
220 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
221 | buffer_free(&b); | |
222 | return NULL; | |
223 | } | |
224 | i1 = buffer_get_int(&b); | |
225 | type = buffer_get_string(&b, NULL); | |
226 | cipher = buffer_get_string(&b, NULL); | |
227 | i2 = buffer_get_int(&b); | |
228 | i3 = buffer_get_int(&b); | |
229 | i4 = buffer_get_int(&b); | |
230 | debug("ignore (%d %d %d %d)", i1,i2,i3,i4); | |
231 | if (strcmp(cipher, "none") != 0) { | |
232 | error("unsupported cipher %s", cipher); | |
233 | xfree(cipher); | |
234 | buffer_free(&b); | |
235 | xfree(type); | |
236 | return NULL; | |
237 | } | |
238 | xfree(cipher); | |
239 | ||
240 | if (strstr(type, "dsa")) { | |
241 | ktype = KEY_DSA; | |
242 | } else if (strstr(type, "rsa")) { | |
243 | ktype = KEY_RSA; | |
244 | } else { | |
245 | xfree(type); | |
246 | return NULL; | |
247 | } | |
248 | key = key_new_private(ktype); | |
249 | xfree(type); | |
250 | ||
251 | switch (key->type) { | |
252 | case KEY_DSA: | |
253 | buffer_get_bignum_bits(&b, key->dsa->p); | |
254 | buffer_get_bignum_bits(&b, key->dsa->g); | |
255 | buffer_get_bignum_bits(&b, key->dsa->q); | |
256 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
257 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
258 | break; | |
259 | case KEY_RSA: | |
260 | e = buffer_get_char(&b); | |
261 | debug("e %lx", e); | |
262 | if (e < 30) { | |
263 | e <<= 8; | |
264 | e += buffer_get_char(&b); | |
265 | debug("e %lx", e); | |
266 | e <<= 8; | |
267 | e += buffer_get_char(&b); | |
268 | debug("e %lx", e); | |
269 | } | |
270 | if (!BN_set_word(key->rsa->e, e)) { | |
271 | buffer_free(&b); | |
272 | key_free(key); | |
273 | return NULL; | |
274 | } | |
275 | buffer_get_bignum_bits(&b, key->rsa->d); | |
276 | buffer_get_bignum_bits(&b, key->rsa->n); | |
277 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
278 | buffer_get_bignum_bits(&b, key->rsa->q); | |
279 | buffer_get_bignum_bits(&b, key->rsa->p); | |
280 | rsa_generate_additional_parameters(key->rsa); | |
281 | break; | |
282 | } | |
283 | rlen = buffer_len(&b); | |
e9a17296 | 284 | if (rlen != 0) |
3c0ef626 | 285 | error("do_convert_private_ssh2_from_blob: " |
286 | "remaining bytes in key blob %d", rlen); | |
287 | buffer_free(&b); | |
288 | ||
289 | /* try the key */ | |
290 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
291 | key_verify(key, sig, slen, data, sizeof(data)); | |
292 | xfree(sig); | |
293 | return key; | |
294 | } | |
295 | ||
296 | static void | |
297 | do_convert_from_ssh2(struct passwd *pw) | |
298 | { | |
299 | Key *k; | |
300 | int blen; | |
700318f3 | 301 | u_int len; |
3c0ef626 | 302 | char line[1024], *p; |
303 | u_char blob[8096]; | |
304 | char encoded[8096]; | |
305 | struct stat st; | |
306 | int escaped = 0, private = 0, ok; | |
307 | FILE *fp; | |
308 | ||
309 | if (!have_identity) | |
310 | ask_filename(pw, "Enter file in which the key is"); | |
311 | if (stat(identity_file, &st) < 0) { | |
312 | perror(identity_file); | |
313 | exit(1); | |
314 | } | |
315 | fp = fopen(identity_file, "r"); | |
316 | if (fp == NULL) { | |
317 | perror(identity_file); | |
318 | exit(1); | |
319 | } | |
320 | encoded[0] = '\0'; | |
321 | while (fgets(line, sizeof(line), fp)) { | |
322 | if (!(p = strchr(line, '\n'))) { | |
323 | fprintf(stderr, "input line too long.\n"); | |
324 | exit(1); | |
325 | } | |
326 | if (p > line && p[-1] == '\\') | |
327 | escaped++; | |
328 | if (strncmp(line, "----", 4) == 0 || | |
329 | strstr(line, ": ") != NULL) { | |
330 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
331 | private = 1; | |
332 | if (strstr(line, " END ") != NULL) { | |
333 | break; | |
334 | } | |
335 | /* fprintf(stderr, "ignore: %s", line); */ | |
336 | continue; | |
337 | } | |
338 | if (escaped) { | |
339 | escaped--; | |
340 | /* fprintf(stderr, "escaped: %s", line); */ | |
341 | continue; | |
342 | } | |
343 | *p = '\0'; | |
344 | strlcat(encoded, line, sizeof(encoded)); | |
345 | } | |
700318f3 | 346 | len = strlen(encoded); |
347 | if (((len % 4) == 3) && | |
348 | (encoded[len-1] == '=') && | |
349 | (encoded[len-2] == '=') && | |
350 | (encoded[len-3] == '=')) | |
351 | encoded[len-3] = '\0'; | |
e9a17296 | 352 | blen = uudecode(encoded, blob, sizeof(blob)); |
3c0ef626 | 353 | if (blen < 0) { |
354 | fprintf(stderr, "uudecode failed.\n"); | |
355 | exit(1); | |
356 | } | |
357 | k = private ? | |
358 | do_convert_private_ssh2_from_blob(blob, blen) : | |
359 | key_from_blob(blob, blen); | |
360 | if (k == NULL) { | |
361 | fprintf(stderr, "decode blob failed.\n"); | |
362 | exit(1); | |
363 | } | |
364 | ok = private ? | |
365 | (k->type == KEY_DSA ? | |
366 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
367 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
368 | key_write(k, stdout); | |
369 | if (!ok) { | |
370 | fprintf(stderr, "key write failed"); | |
371 | exit(1); | |
372 | } | |
373 | key_free(k); | |
e9a17296 | 374 | if (!private) |
375 | fprintf(stdout, "\n"); | |
3c0ef626 | 376 | fclose(fp); |
377 | exit(0); | |
378 | } | |
379 | ||
380 | static void | |
381 | do_print_public(struct passwd *pw) | |
382 | { | |
383 | Key *prv; | |
384 | struct stat st; | |
385 | ||
386 | if (!have_identity) | |
387 | ask_filename(pw, "Enter file in which the key is"); | |
388 | if (stat(identity_file, &st) < 0) { | |
389 | perror(identity_file); | |
390 | exit(1); | |
391 | } | |
392 | prv = load_identity(identity_file); | |
393 | if (prv == NULL) { | |
394 | fprintf(stderr, "load failed\n"); | |
395 | exit(1); | |
396 | } | |
397 | if (!key_write(prv, stdout)) | |
398 | fprintf(stderr, "key_write failed"); | |
399 | key_free(prv); | |
400 | fprintf(stdout, "\n"); | |
401 | exit(0); | |
402 | } | |
403 | ||
404 | #ifdef SMARTCARD | |
3c0ef626 | 405 | static void |
406 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
407 | { | |
408 | Key *prv = NULL; | |
409 | struct stat st; | |
700318f3 | 410 | int ret; |
411 | ||
3c0ef626 | 412 | if (!have_identity) |
413 | ask_filename(pw, "Enter file in which the key is"); | |
414 | if (stat(identity_file, &st) < 0) { | |
415 | perror(identity_file); | |
700318f3 | 416 | exit(1); |
3c0ef626 | 417 | } |
418 | prv = load_identity(identity_file); | |
419 | if (prv == NULL) { | |
420 | error("load failed"); | |
700318f3 | 421 | exit(1); |
3c0ef626 | 422 | } |
700318f3 | 423 | ret = sc_put_key(prv, sc_reader_id); |
424 | key_free(prv); | |
425 | if (ret < 0) | |
426 | exit(1); | |
0fff78ff | 427 | logit("loading key done"); |
700318f3 | 428 | exit(0); |
3c0ef626 | 429 | } |
430 | ||
431 | static void | |
432 | do_download(struct passwd *pw, const char *sc_reader_id) | |
433 | { | |
700318f3 | 434 | Key **keys = NULL; |
435 | int i; | |
3c0ef626 | 436 | |
700318f3 | 437 | keys = sc_get_keys(sc_reader_id, NULL); |
438 | if (keys == NULL) | |
3c0ef626 | 439 | fatal("cannot read public key from smartcard"); |
700318f3 | 440 | for (i = 0; keys[i]; i++) { |
441 | key_write(keys[i], stdout); | |
442 | key_free(keys[i]); | |
443 | fprintf(stdout, "\n"); | |
444 | } | |
445 | xfree(keys); | |
3c0ef626 | 446 | exit(0); |
447 | } | |
448 | #endif /* SMARTCARD */ | |
449 | ||
450 | static void | |
451 | do_fingerprint(struct passwd *pw) | |
452 | { | |
453 | FILE *f; | |
454 | Key *public; | |
455 | char *comment = NULL, *cp, *ep, line[16*1024], *fp; | |
e9a17296 | 456 | int i, skip = 0, num = 1, invalid = 1; |
457 | enum fp_rep rep; | |
458 | enum fp_type fptype; | |
3c0ef626 | 459 | struct stat st; |
460 | ||
461 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
462 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
463 | ||
464 | if (!have_identity) | |
465 | ask_filename(pw, "Enter file in which the key is"); | |
466 | if (stat(identity_file, &st) < 0) { | |
467 | perror(identity_file); | |
468 | exit(1); | |
469 | } | |
470 | public = key_load_public(identity_file, &comment); | |
471 | if (public != NULL) { | |
472 | fp = key_fingerprint(public, fptype, rep); | |
680cee3b | 473 | printf("%u %s %s\n", key_size(public), fp, comment); |
3c0ef626 | 474 | key_free(public); |
475 | xfree(comment); | |
476 | xfree(fp); | |
477 | exit(0); | |
478 | } | |
479 | if (comment) | |
480 | xfree(comment); | |
481 | ||
482 | f = fopen(identity_file, "r"); | |
483 | if (f != NULL) { | |
484 | while (fgets(line, sizeof(line), f)) { | |
485 | i = strlen(line) - 1; | |
486 | if (line[i] != '\n') { | |
487 | error("line %d too long: %.40s...", num, line); | |
488 | skip = 1; | |
489 | continue; | |
490 | } | |
491 | num++; | |
492 | if (skip) { | |
493 | skip = 0; | |
494 | continue; | |
495 | } | |
496 | line[i] = '\0'; | |
497 | ||
498 | /* Skip leading whitespace, empty and comment lines. */ | |
499 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
500 | ; | |
501 | if (!*cp || *cp == '\n' || *cp == '#') | |
502 | continue ; | |
503 | i = strtol(cp, &ep, 10); | |
504 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
505 | int quoted = 0; | |
506 | comment = cp; | |
680cee3b | 507 | for (; *cp && (quoted || (*cp != ' ' && |
508 | *cp != '\t')); cp++) { | |
3c0ef626 | 509 | if (*cp == '\\' && cp[1] == '"') |
510 | cp++; /* Skip both */ | |
511 | else if (*cp == '"') | |
512 | quoted = !quoted; | |
513 | } | |
514 | if (!*cp) | |
515 | continue; | |
516 | *cp++ = '\0'; | |
517 | } | |
518 | ep = cp; | |
519 | public = key_new(KEY_RSA1); | |
520 | if (key_read(public, &cp) != 1) { | |
521 | cp = ep; | |
522 | key_free(public); | |
523 | public = key_new(KEY_UNSPEC); | |
524 | if (key_read(public, &cp) != 1) { | |
525 | key_free(public); | |
526 | continue; | |
527 | } | |
528 | } | |
529 | comment = *cp ? cp : comment; | |
530 | fp = key_fingerprint(public, fptype, rep); | |
680cee3b | 531 | printf("%u %s %s\n", key_size(public), fp, |
3c0ef626 | 532 | comment ? comment : "no comment"); |
533 | xfree(fp); | |
534 | key_free(public); | |
535 | invalid = 0; | |
536 | } | |
537 | fclose(f); | |
538 | } | |
539 | if (invalid) { | |
540 | printf("%s is not a public key file.\n", identity_file); | |
541 | exit(1); | |
542 | } | |
543 | exit(0); | |
544 | } | |
545 | ||
546 | /* | |
547 | * Perform changing a passphrase. The argument is the passwd structure | |
548 | * for the current user. | |
549 | */ | |
550 | static void | |
551 | do_change_passphrase(struct passwd *pw) | |
552 | { | |
553 | char *comment; | |
554 | char *old_passphrase, *passphrase1, *passphrase2; | |
555 | struct stat st; | |
556 | Key *private; | |
557 | ||
558 | if (!have_identity) | |
559 | ask_filename(pw, "Enter file in which the key is"); | |
560 | if (stat(identity_file, &st) < 0) { | |
561 | perror(identity_file); | |
562 | exit(1); | |
563 | } | |
564 | /* Try to load the file with empty passphrase. */ | |
565 | private = key_load_private(identity_file, "", &comment); | |
566 | if (private == NULL) { | |
567 | if (identity_passphrase) | |
568 | old_passphrase = xstrdup(identity_passphrase); | |
569 | else | |
570 | old_passphrase = | |
571 | read_passphrase("Enter old passphrase: ", | |
572 | RP_ALLOW_STDIN); | |
573 | private = key_load_private(identity_file, old_passphrase, | |
574 | &comment); | |
575 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
576 | xfree(old_passphrase); | |
577 | if (private == NULL) { | |
578 | printf("Bad passphrase.\n"); | |
579 | exit(1); | |
580 | } | |
581 | } | |
582 | printf("Key has comment '%s'\n", comment); | |
583 | ||
584 | /* Ask the new passphrase (twice). */ | |
585 | if (identity_new_passphrase) { | |
586 | passphrase1 = xstrdup(identity_new_passphrase); | |
587 | passphrase2 = NULL; | |
588 | } else { | |
589 | passphrase1 = | |
590 | read_passphrase("Enter new passphrase (empty for no " | |
591 | "passphrase): ", RP_ALLOW_STDIN); | |
592 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
e9a17296 | 593 | RP_ALLOW_STDIN); |
3c0ef626 | 594 | |
595 | /* Verify that they are the same. */ | |
596 | if (strcmp(passphrase1, passphrase2) != 0) { | |
597 | memset(passphrase1, 0, strlen(passphrase1)); | |
598 | memset(passphrase2, 0, strlen(passphrase2)); | |
599 | xfree(passphrase1); | |
600 | xfree(passphrase2); | |
601 | printf("Pass phrases do not match. Try again.\n"); | |
602 | exit(1); | |
603 | } | |
604 | /* Destroy the other copy. */ | |
605 | memset(passphrase2, 0, strlen(passphrase2)); | |
606 | xfree(passphrase2); | |
607 | } | |
608 | ||
609 | /* Save the file using the new passphrase. */ | |
610 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
611 | printf("Saving the key failed: %s.\n", identity_file); | |
612 | memset(passphrase1, 0, strlen(passphrase1)); | |
613 | xfree(passphrase1); | |
614 | key_free(private); | |
615 | xfree(comment); | |
616 | exit(1); | |
617 | } | |
618 | /* Destroy the passphrase and the copy of the key in memory. */ | |
619 | memset(passphrase1, 0, strlen(passphrase1)); | |
620 | xfree(passphrase1); | |
621 | key_free(private); /* Destroys contents */ | |
622 | xfree(comment); | |
623 | ||
624 | printf("Your identification has been saved with the new passphrase.\n"); | |
625 | exit(0); | |
626 | } | |
627 | ||
9cb1827b | 628 | #ifdef DNS |
0fff78ff | 629 | /* |
630 | * Print the SSHFP RR. | |
631 | */ | |
632 | static void | |
633 | do_print_resource_record(struct passwd *pw, char *hostname) | |
634 | { | |
635 | Key *public; | |
636 | char *comment = NULL; | |
637 | struct stat st; | |
638 | ||
639 | if (!have_identity) | |
640 | ask_filename(pw, "Enter file in which the key is"); | |
641 | if (stat(identity_file, &st) < 0) { | |
642 | perror(identity_file); | |
643 | exit(1); | |
644 | } | |
645 | public = key_load_public(identity_file, &comment); | |
646 | if (public != NULL) { | |
647 | export_dns_rr(hostname, public, stdout, print_generic); | |
648 | key_free(public); | |
649 | xfree(comment); | |
650 | exit(0); | |
651 | } | |
652 | if (comment) | |
653 | xfree(comment); | |
654 | ||
655 | printf("failed to read v2 public key from %s.\n", identity_file); | |
656 | exit(1); | |
657 | } | |
9cb1827b | 658 | #endif /* DNS */ |
0fff78ff | 659 | |
3c0ef626 | 660 | /* |
661 | * Change the comment of a private key file. | |
662 | */ | |
663 | static void | |
664 | do_change_comment(struct passwd *pw) | |
665 | { | |
666 | char new_comment[1024], *comment, *passphrase; | |
667 | Key *private; | |
668 | Key *public; | |
669 | struct stat st; | |
670 | FILE *f; | |
671 | int fd; | |
672 | ||
673 | if (!have_identity) | |
674 | ask_filename(pw, "Enter file in which the key is"); | |
675 | if (stat(identity_file, &st) < 0) { | |
676 | perror(identity_file); | |
677 | exit(1); | |
678 | } | |
679 | private = key_load_private(identity_file, "", &comment); | |
680 | if (private == NULL) { | |
681 | if (identity_passphrase) | |
682 | passphrase = xstrdup(identity_passphrase); | |
683 | else if (identity_new_passphrase) | |
684 | passphrase = xstrdup(identity_new_passphrase); | |
685 | else | |
686 | passphrase = read_passphrase("Enter passphrase: ", | |
687 | RP_ALLOW_STDIN); | |
688 | /* Try to load using the passphrase. */ | |
689 | private = key_load_private(identity_file, passphrase, &comment); | |
690 | if (private == NULL) { | |
691 | memset(passphrase, 0, strlen(passphrase)); | |
692 | xfree(passphrase); | |
693 | printf("Bad passphrase.\n"); | |
694 | exit(1); | |
695 | } | |
696 | } else { | |
697 | passphrase = xstrdup(""); | |
698 | } | |
699 | if (private->type != KEY_RSA1) { | |
700 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
701 | key_free(private); | |
702 | exit(1); | |
e9a17296 | 703 | } |
3c0ef626 | 704 | printf("Key now has comment '%s'\n", comment); |
705 | ||
706 | if (identity_comment) { | |
707 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
708 | } else { | |
709 | printf("Enter new comment: "); | |
710 | fflush(stdout); | |
711 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
712 | memset(passphrase, 0, strlen(passphrase)); | |
713 | key_free(private); | |
714 | exit(1); | |
715 | } | |
716 | if (strchr(new_comment, '\n')) | |
717 | *strchr(new_comment, '\n') = 0; | |
718 | } | |
719 | ||
720 | /* Save the file using the new passphrase. */ | |
721 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
722 | printf("Saving the key failed: %s.\n", identity_file); | |
723 | memset(passphrase, 0, strlen(passphrase)); | |
724 | xfree(passphrase); | |
725 | key_free(private); | |
726 | xfree(comment); | |
727 | exit(1); | |
728 | } | |
729 | memset(passphrase, 0, strlen(passphrase)); | |
730 | xfree(passphrase); | |
731 | public = key_from_private(private); | |
732 | key_free(private); | |
733 | ||
734 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
735 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
736 | if (fd == -1) { | |
737 | printf("Could not save your public key in %s\n", identity_file); | |
738 | exit(1); | |
739 | } | |
740 | f = fdopen(fd, "w"); | |
741 | if (f == NULL) { | |
742 | printf("fdopen %s failed", identity_file); | |
743 | exit(1); | |
744 | } | |
745 | if (!key_write(public, f)) | |
746 | fprintf(stderr, "write key failed"); | |
747 | key_free(public); | |
748 | fprintf(f, " %s\n", new_comment); | |
749 | fclose(f); | |
750 | ||
751 | xfree(comment); | |
752 | ||
753 | printf("The comment in your key file has been changed.\n"); | |
754 | exit(0); | |
755 | } | |
756 | ||
757 | static void | |
758 | usage(void) | |
759 | { | |
760 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
761 | fprintf(stderr, "Options:\n"); | |
762 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
763 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
764 | fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); | |
765 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
0fff78ff | 766 | fprintf(stderr, " -g Use generic DNS resource record format.\n"); |
3c0ef626 | 767 | fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); |
768 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
769 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
770 | fprintf(stderr, " -q Quiet.\n"); | |
771 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
772 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
773 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
774 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
775 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
776 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
9cb1827b | 777 | #ifdef DNS |
0fff78ff | 778 | fprintf(stderr, " -r hostname Print DNS resource record.\n"); |
9cb1827b | 779 | #endif /* DNS */ |
3c0ef626 | 780 | #ifdef SMARTCARD |
781 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
782 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
783 | #endif /* SMARTCARD */ | |
784 | ||
0fff78ff | 785 | fprintf(stderr, " -G file Generate candidates for DH-GEX moduli\n"); |
786 | fprintf(stderr, " -T file Screen candidates for DH-GEX moduli\n"); | |
787 | ||
3c0ef626 | 788 | exit(1); |
789 | } | |
790 | ||
791 | /* | |
792 | * Main program for key management. | |
793 | */ | |
794 | int | |
795 | main(int ac, char **av) | |
796 | { | |
e9a17296 | 797 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; |
0fff78ff | 798 | char out_file[MAXPATHLEN], *reader_id = NULL; |
799 | char *resource_record_hostname = NULL; | |
3c0ef626 | 800 | Key *private, *public; |
801 | struct passwd *pw; | |
802 | struct stat st; | |
0fff78ff | 803 | int opt, type, fd, download = 0, memory = 0; |
804 | int generator_wanted = 0, trials = 100; | |
805 | int do_gen_candidates = 0, do_screen_candidates = 0; | |
806 | BIGNUM *start = NULL; | |
3c0ef626 | 807 | FILE *f; |
808 | ||
809 | extern int optind; | |
810 | extern char *optarg; | |
811 | ||
0fff78ff | 812 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 813 | |
814 | SSLeay_add_all_algorithms(); | |
0fff78ff | 815 | log_init(av[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1); |
816 | ||
41b2f314 | 817 | init_rng(); |
818 | seed_rng(); | |
3c0ef626 | 819 | |
820 | /* we need this for the home * directory. */ | |
821 | pw = getpwuid(getuid()); | |
822 | if (!pw) { | |
823 | printf("You don't exist, go away!\n"); | |
824 | exit(1); | |
825 | } | |
826 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
827 | perror("gethostname"); | |
828 | exit(1); | |
829 | } | |
830 | ||
0fff78ff | 831 | while ((opt = getopt(ac, av, |
9cb1827b | 832 | "degiqpclBRxXyb:f:t:U:D:P:N:C:r:g:T:G:M:S:a:W:")) != -1) { |
3c0ef626 | 833 | switch (opt) { |
834 | case 'b': | |
835 | bits = atoi(optarg); | |
836 | if (bits < 512 || bits > 32768) { | |
837 | printf("Bits has bad value.\n"); | |
838 | exit(1); | |
839 | } | |
840 | break; | |
841 | case 'l': | |
842 | print_fingerprint = 1; | |
843 | break; | |
844 | case 'B': | |
845 | print_bubblebabble = 1; | |
846 | break; | |
847 | case 'p': | |
848 | change_passphrase = 1; | |
849 | break; | |
850 | case 'c': | |
851 | change_comment = 1; | |
852 | break; | |
853 | case 'f': | |
854 | strlcpy(identity_file, optarg, sizeof(identity_file)); | |
855 | have_identity = 1; | |
856 | break; | |
0fff78ff | 857 | case 'g': |
858 | print_generic = 1; | |
859 | break; | |
3c0ef626 | 860 | case 'P': |
861 | identity_passphrase = optarg; | |
862 | break; | |
863 | case 'N': | |
864 | identity_new_passphrase = optarg; | |
865 | break; | |
866 | case 'C': | |
867 | identity_comment = optarg; | |
868 | break; | |
869 | case 'q': | |
870 | quiet = 1; | |
871 | break; | |
872 | case 'R': | |
873 | /* unused */ | |
874 | exit(0); | |
875 | break; | |
876 | case 'e': | |
877 | case 'x': | |
878 | /* export key */ | |
879 | convert_to_ssh2 = 1; | |
880 | break; | |
881 | case 'i': | |
882 | case 'X': | |
883 | /* import key */ | |
884 | convert_from_ssh2 = 1; | |
885 | break; | |
886 | case 'y': | |
887 | print_public = 1; | |
888 | break; | |
889 | case 'd': | |
890 | key_type_name = "dsa"; | |
891 | break; | |
892 | case 't': | |
893 | key_type_name = optarg; | |
894 | break; | |
895 | case 'D': | |
896 | download = 1; | |
897 | case 'U': | |
898 | reader_id = optarg; | |
899 | break; | |
0fff78ff | 900 | case 'r': |
901 | resource_record_hostname = optarg; | |
902 | break; | |
903 | case 'W': | |
904 | generator_wanted = atoi(optarg); | |
905 | if (generator_wanted < 1) | |
906 | fatal("Desired generator has bad value."); | |
907 | break; | |
908 | case 'a': | |
909 | trials = atoi(optarg); | |
910 | if (trials < TRIAL_MINIMUM) { | |
9cb1827b | 911 | fatal("Minimum primality trials is %d", |
0fff78ff | 912 | TRIAL_MINIMUM); |
913 | } | |
914 | break; | |
915 | case 'M': | |
916 | memory = atoi(optarg); | |
9cb1827b | 917 | if (memory != 0 && |
0fff78ff | 918 | (memory < LARGE_MINIMUM || memory > LARGE_MAXIMUM)) { |
919 | fatal("Invalid memory amount (min %ld, max %ld)", | |
920 | LARGE_MINIMUM, LARGE_MAXIMUM); | |
921 | } | |
922 | break; | |
923 | case 'G': | |
924 | do_gen_candidates = 1; | |
925 | strlcpy(out_file, optarg, sizeof(out_file)); | |
926 | break; | |
927 | case 'T': | |
928 | do_screen_candidates = 1; | |
929 | strlcpy(out_file, optarg, sizeof(out_file)); | |
930 | break; | |
931 | case 'S': | |
932 | /* XXX - also compare length against bits */ | |
933 | if (BN_hex2bn(&start, optarg) == 0) | |
934 | fatal("Invalid start point."); | |
935 | break; | |
3c0ef626 | 936 | case '?': |
937 | default: | |
938 | usage(); | |
939 | } | |
940 | } | |
941 | if (optind < ac) { | |
942 | printf("Too many arguments.\n"); | |
943 | usage(); | |
944 | } | |
945 | if (change_passphrase && change_comment) { | |
946 | printf("Can only have one of -p and -c.\n"); | |
947 | usage(); | |
948 | } | |
949 | if (print_fingerprint || print_bubblebabble) | |
950 | do_fingerprint(pw); | |
951 | if (change_passphrase) | |
952 | do_change_passphrase(pw); | |
700318f3 | 953 | if (change_comment) |
954 | do_change_comment(pw); | |
41b2f314 | 955 | if (convert_to_ssh2) |
956 | do_convert_to_ssh2(pw); | |
957 | if (convert_from_ssh2) | |
958 | do_convert_from_ssh2(pw); | |
3c0ef626 | 959 | if (print_public) |
960 | do_print_public(pw); | |
0fff78ff | 961 | if (resource_record_hostname != NULL) { |
9cb1827b | 962 | #ifdef DNS |
0fff78ff | 963 | do_print_resource_record(pw, resource_record_hostname); |
9cb1827b | 964 | #else /* DNS */ |
965 | fatal("no DNS support."); | |
966 | #endif /* DNS */ | |
0fff78ff | 967 | } |
3c0ef626 | 968 | if (reader_id != NULL) { |
969 | #ifdef SMARTCARD | |
970 | if (download) | |
971 | do_download(pw, reader_id); | |
972 | else | |
973 | do_upload(pw, reader_id); | |
974 | #else /* SMARTCARD */ | |
975 | fatal("no support for smartcards."); | |
976 | #endif /* SMARTCARD */ | |
977 | } | |
978 | ||
0fff78ff | 979 | if (do_gen_candidates) { |
980 | FILE *out = fopen(out_file, "w"); | |
9cb1827b | 981 | |
0fff78ff | 982 | if (out == NULL) { |
983 | error("Couldn't open modulus candidate file \"%s\": %s", | |
984 | out_file, strerror(errno)); | |
985 | return (1); | |
986 | } | |
987 | if (gen_candidates(out, memory, bits, start) != 0) | |
988 | fatal("modulus candidate generation failed\n"); | |
989 | ||
990 | return (0); | |
991 | } | |
992 | ||
993 | if (do_screen_candidates) { | |
994 | FILE *in; | |
995 | FILE *out = fopen(out_file, "w"); | |
996 | ||
997 | if (have_identity && strcmp(identity_file, "-") != 0) { | |
998 | if ((in = fopen(identity_file, "r")) == NULL) { | |
999 | fatal("Couldn't open modulus candidate " | |
9cb1827b | 1000 | "file \"%s\": %s", identity_file, |
0fff78ff | 1001 | strerror(errno)); |
1002 | } | |
1003 | } else | |
1004 | in = stdin; | |
1005 | ||
1006 | if (out == NULL) { | |
1007 | fatal("Couldn't open moduli file \"%s\": %s", | |
1008 | out_file, strerror(errno)); | |
1009 | } | |
1010 | if (prime_test(in, out, trials, generator_wanted) != 0) | |
1011 | fatal("modulus screening failed\n"); | |
1012 | return (0); | |
1013 | } | |
1014 | ||
3c0ef626 | 1015 | arc4random_stir(); |
1016 | ||
e9a17296 | 1017 | if (key_type_name == NULL) { |
1018 | printf("You must specify a key type (-t).\n"); | |
1019 | usage(); | |
1020 | } | |
3c0ef626 | 1021 | type = key_type_from_name(key_type_name); |
1022 | if (type == KEY_UNSPEC) { | |
1023 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
1024 | exit(1); | |
1025 | } | |
1026 | if (!quiet) | |
1027 | printf("Generating public/private %s key pair.\n", key_type_name); | |
1028 | private = key_generate(type, bits); | |
1029 | if (private == NULL) { | |
1030 | fprintf(stderr, "key_generate failed"); | |
1031 | exit(1); | |
1032 | } | |
1033 | public = key_from_private(private); | |
1034 | ||
1035 | if (!have_identity) | |
1036 | ask_filename(pw, "Enter file in which to save the key"); | |
1037 | ||
1038 | /* Create ~/.ssh directory if it doesn\'t already exist. */ | |
1039 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
1040 | if (strstr(identity_file, dotsshdir) != NULL && | |
1041 | stat(dotsshdir, &st) < 0) { | |
1042 | if (mkdir(dotsshdir, 0700) < 0) | |
1043 | error("Could not create directory '%s'.", dotsshdir); | |
1044 | else if (!quiet) | |
1045 | printf("Created directory '%s'.\n", dotsshdir); | |
1046 | } | |
1047 | /* If the file already exists, ask the user to confirm. */ | |
1048 | if (stat(identity_file, &st) >= 0) { | |
1049 | char yesno[3]; | |
1050 | printf("%s already exists.\n", identity_file); | |
1051 | printf("Overwrite (y/n)? "); | |
1052 | fflush(stdout); | |
1053 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
1054 | exit(1); | |
1055 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
1056 | exit(1); | |
1057 | } | |
1058 | /* Ask for a passphrase (twice). */ | |
1059 | if (identity_passphrase) | |
1060 | passphrase1 = xstrdup(identity_passphrase); | |
1061 | else if (identity_new_passphrase) | |
1062 | passphrase1 = xstrdup(identity_new_passphrase); | |
1063 | else { | |
1064 | passphrase_again: | |
1065 | passphrase1 = | |
1066 | read_passphrase("Enter passphrase (empty for no " | |
1067 | "passphrase): ", RP_ALLOW_STDIN); | |
1068 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
1069 | RP_ALLOW_STDIN); | |
1070 | if (strcmp(passphrase1, passphrase2) != 0) { | |
1071 | /* | |
1072 | * The passphrases do not match. Clear them and | |
1073 | * retry. | |
1074 | */ | |
1075 | memset(passphrase1, 0, strlen(passphrase1)); | |
1076 | memset(passphrase2, 0, strlen(passphrase2)); | |
1077 | xfree(passphrase1); | |
1078 | xfree(passphrase2); | |
1079 | printf("Passphrases do not match. Try again.\n"); | |
1080 | goto passphrase_again; | |
1081 | } | |
1082 | /* Clear the other copy of the passphrase. */ | |
1083 | memset(passphrase2, 0, strlen(passphrase2)); | |
1084 | xfree(passphrase2); | |
1085 | } | |
1086 | ||
1087 | if (identity_comment) { | |
1088 | strlcpy(comment, identity_comment, sizeof(comment)); | |
1089 | } else { | |
1090 | /* Create default commend field for the passphrase. */ | |
1091 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
1092 | } | |
1093 | ||
1094 | /* Save the key with the given passphrase and comment. */ | |
1095 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
1096 | printf("Saving the key failed: %s.\n", identity_file); | |
1097 | memset(passphrase1, 0, strlen(passphrase1)); | |
1098 | xfree(passphrase1); | |
1099 | exit(1); | |
1100 | } | |
1101 | /* Clear the passphrase. */ | |
1102 | memset(passphrase1, 0, strlen(passphrase1)); | |
1103 | xfree(passphrase1); | |
1104 | ||
1105 | /* Clear the private key and the random number generator. */ | |
1106 | key_free(private); | |
1107 | arc4random_stir(); | |
1108 | ||
1109 | if (!quiet) | |
1110 | printf("Your identification has been saved in %s.\n", identity_file); | |
1111 | ||
1112 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
1113 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
1114 | if (fd == -1) { | |
1115 | printf("Could not save your public key in %s\n", identity_file); | |
1116 | exit(1); | |
1117 | } | |
1118 | f = fdopen(fd, "w"); | |
1119 | if (f == NULL) { | |
1120 | printf("fdopen %s failed", identity_file); | |
1121 | exit(1); | |
1122 | } | |
1123 | if (!key_write(public, f)) | |
1124 | fprintf(stderr, "write key failed"); | |
1125 | fprintf(f, " %s\n", comment); | |
1126 | fclose(f); | |
1127 | ||
1128 | if (!quiet) { | |
1129 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
1130 | printf("Your public key has been saved in %s.\n", | |
1131 | identity_file); | |
1132 | printf("The key fingerprint is:\n"); | |
1133 | printf("%s %s\n", fp, comment); | |
1134 | xfree(fp); | |
1135 | } | |
1136 | ||
1137 | key_free(public); | |
1138 | exit(0); | |
1139 | } |