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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 1.101 2002/06/23 09:39:55 deraadt 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 | ||
35 | /* Number of bits in the RSA/DSA key. This value can be changed on the command line. */ | |
36 | int bits = 1024; | |
37 | ||
38 | /* | |
39 | * Flag indicating that we just want to change the passphrase. This can be | |
40 | * set on the command line. | |
41 | */ | |
42 | int change_passphrase = 0; | |
43 | ||
44 | /* | |
45 | * Flag indicating that we just want to change the comment. This can be set | |
46 | * on the command line. | |
47 | */ | |
48 | int change_comment = 0; | |
49 | ||
50 | int quiet = 0; | |
51 | ||
52 | /* Flag indicating that we just want to see the key fingerprint */ | |
53 | int print_fingerprint = 0; | |
54 | int print_bubblebabble = 0; | |
55 | ||
56 | /* The identity file name, given on the command line or entered by the user. */ | |
57 | char identity_file[1024]; | |
58 | int have_identity = 0; | |
59 | ||
60 | /* This is set to the passphrase if given on the command line. */ | |
61 | char *identity_passphrase = NULL; | |
62 | ||
63 | /* This is set to the new passphrase if given on the command line. */ | |
64 | char *identity_new_passphrase = NULL; | |
65 | ||
66 | /* This is set to the new comment if given on the command line. */ | |
67 | char *identity_comment = NULL; | |
68 | ||
69 | /* Dump public key file in format used by real and the original SSH 2 */ | |
70 | int convert_to_ssh2 = 0; | |
71 | int convert_from_ssh2 = 0; | |
72 | int print_public = 0; | |
73 | ||
74 | char *key_type_name = NULL; | |
75 | ||
76 | /* argv0 */ | |
77 | #ifdef HAVE___PROGNAME | |
78 | extern char *__progname; | |
79 | #else | |
80 | char *__progname; | |
81 | #endif | |
82 | ||
83 | char hostname[MAXHOSTNAMELEN]; | |
84 | ||
85 | static void | |
86 | ask_filename(struct passwd *pw, const char *prompt) | |
87 | { | |
88 | char buf[1024]; | |
89 | char *name = NULL; | |
90 | ||
91 | if (key_type_name == NULL) | |
92 | name = _PATH_SSH_CLIENT_ID_RSA; | |
93 | else | |
94 | switch (key_type_from_name(key_type_name)) { | |
95 | case KEY_RSA1: | |
96 | name = _PATH_SSH_CLIENT_IDENTITY; | |
97 | break; | |
98 | case KEY_DSA: | |
99 | name = _PATH_SSH_CLIENT_ID_DSA; | |
100 | break; | |
101 | case KEY_RSA: | |
102 | name = _PATH_SSH_CLIENT_ID_RSA; | |
103 | break; | |
104 | default: | |
105 | fprintf(stderr, "bad key type"); | |
106 | exit(1); | |
107 | break; | |
108 | } | |
109 | ||
110 | snprintf(identity_file, sizeof(identity_file), "%s/%s", pw->pw_dir, name); | |
111 | fprintf(stderr, "%s (%s): ", prompt, identity_file); | |
112 | fflush(stderr); | |
113 | if (fgets(buf, sizeof(buf), stdin) == NULL) | |
114 | exit(1); | |
115 | if (strchr(buf, '\n')) | |
116 | *strchr(buf, '\n') = 0; | |
117 | if (strcmp(buf, "") != 0) | |
118 | strlcpy(identity_file, buf, sizeof(identity_file)); | |
119 | have_identity = 1; | |
120 | } | |
121 | ||
122 | static Key * | |
123 | load_identity(char *filename) | |
124 | { | |
125 | char *pass; | |
126 | Key *prv; | |
127 | ||
128 | prv = key_load_private(filename, "", NULL); | |
129 | if (prv == NULL) { | |
130 | if (identity_passphrase) | |
131 | pass = xstrdup(identity_passphrase); | |
132 | else | |
133 | pass = read_passphrase("Enter passphrase: ", | |
134 | RP_ALLOW_STDIN); | |
135 | prv = key_load_private(filename, pass, NULL); | |
136 | memset(pass, 0, strlen(pass)); | |
137 | xfree(pass); | |
138 | } | |
139 | return prv; | |
140 | } | |
141 | ||
142 | #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----" | |
143 | #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----" | |
144 | #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----" | |
145 | #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb | |
146 | ||
147 | static void | |
148 | do_convert_to_ssh2(struct passwd *pw) | |
149 | { | |
150 | Key *k; | |
151 | u_int len; | |
152 | u_char *blob; | |
153 | struct stat st; | |
154 | ||
155 | if (!have_identity) | |
156 | ask_filename(pw, "Enter file in which the key is"); | |
157 | if (stat(identity_file, &st) < 0) { | |
158 | perror(identity_file); | |
159 | exit(1); | |
160 | } | |
161 | if ((k = key_load_public(identity_file, NULL)) == NULL) { | |
162 | if ((k = load_identity(identity_file)) == NULL) { | |
163 | fprintf(stderr, "load failed\n"); | |
164 | exit(1); | |
165 | } | |
166 | } | |
167 | if (key_to_blob(k, &blob, &len) <= 0) { | |
168 | fprintf(stderr, "key_to_blob failed\n"); | |
169 | exit(1); | |
170 | } | |
171 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN); | |
172 | fprintf(stdout, | |
173 | "Comment: \"%u-bit %s, converted from OpenSSH by %s@%s\"\n", | |
174 | key_size(k), key_type(k), | |
175 | pw->pw_name, hostname); | |
176 | dump_base64(stdout, blob, len); | |
177 | fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END); | |
178 | key_free(k); | |
179 | xfree(blob); | |
180 | exit(0); | |
181 | } | |
182 | ||
183 | static void | |
184 | buffer_get_bignum_bits(Buffer *b, BIGNUM *value) | |
185 | { | |
186 | int bits = buffer_get_int(b); | |
187 | int bytes = (bits + 7) / 8; | |
188 | ||
189 | if (buffer_len(b) < bytes) | |
190 | fatal("buffer_get_bignum_bits: input buffer too small: " | |
191 | "need %d have %d", bytes, buffer_len(b)); | |
192 | BN_bin2bn(buffer_ptr(b), bytes, value); | |
193 | buffer_consume(b, bytes); | |
194 | } | |
195 | ||
196 | static Key * | |
197 | do_convert_private_ssh2_from_blob(u_char *blob, u_int blen) | |
198 | { | |
199 | Buffer b; | |
200 | Key *key = NULL; | |
201 | char *type, *cipher; | |
202 | u_char *sig, data[] = "abcde12345"; | |
203 | int magic, rlen, ktype, i1, i2, i3, i4; | |
204 | u_int slen; | |
205 | u_long e; | |
206 | ||
207 | buffer_init(&b); | |
208 | buffer_append(&b, blob, blen); | |
209 | ||
210 | magic = buffer_get_int(&b); | |
211 | if (magic != SSH_COM_PRIVATE_KEY_MAGIC) { | |
212 | error("bad magic 0x%x != 0x%x", magic, SSH_COM_PRIVATE_KEY_MAGIC); | |
213 | buffer_free(&b); | |
214 | return NULL; | |
215 | } | |
216 | i1 = buffer_get_int(&b); | |
217 | type = buffer_get_string(&b, NULL); | |
218 | cipher = buffer_get_string(&b, NULL); | |
219 | i2 = buffer_get_int(&b); | |
220 | i3 = buffer_get_int(&b); | |
221 | i4 = buffer_get_int(&b); | |
222 | debug("ignore (%d %d %d %d)", i1,i2,i3,i4); | |
223 | if (strcmp(cipher, "none") != 0) { | |
224 | error("unsupported cipher %s", cipher); | |
225 | xfree(cipher); | |
226 | buffer_free(&b); | |
227 | xfree(type); | |
228 | return NULL; | |
229 | } | |
230 | xfree(cipher); | |
231 | ||
232 | if (strstr(type, "dsa")) { | |
233 | ktype = KEY_DSA; | |
234 | } else if (strstr(type, "rsa")) { | |
235 | ktype = KEY_RSA; | |
236 | } else { | |
237 | xfree(type); | |
238 | return NULL; | |
239 | } | |
240 | key = key_new_private(ktype); | |
241 | xfree(type); | |
242 | ||
243 | switch (key->type) { | |
244 | case KEY_DSA: | |
245 | buffer_get_bignum_bits(&b, key->dsa->p); | |
246 | buffer_get_bignum_bits(&b, key->dsa->g); | |
247 | buffer_get_bignum_bits(&b, key->dsa->q); | |
248 | buffer_get_bignum_bits(&b, key->dsa->pub_key); | |
249 | buffer_get_bignum_bits(&b, key->dsa->priv_key); | |
250 | break; | |
251 | case KEY_RSA: | |
252 | e = buffer_get_char(&b); | |
253 | debug("e %lx", e); | |
254 | if (e < 30) { | |
255 | e <<= 8; | |
256 | e += buffer_get_char(&b); | |
257 | debug("e %lx", e); | |
258 | e <<= 8; | |
259 | e += buffer_get_char(&b); | |
260 | debug("e %lx", e); | |
261 | } | |
262 | if (!BN_set_word(key->rsa->e, e)) { | |
263 | buffer_free(&b); | |
264 | key_free(key); | |
265 | return NULL; | |
266 | } | |
267 | buffer_get_bignum_bits(&b, key->rsa->d); | |
268 | buffer_get_bignum_bits(&b, key->rsa->n); | |
269 | buffer_get_bignum_bits(&b, key->rsa->iqmp); | |
270 | buffer_get_bignum_bits(&b, key->rsa->q); | |
271 | buffer_get_bignum_bits(&b, key->rsa->p); | |
272 | rsa_generate_additional_parameters(key->rsa); | |
273 | break; | |
274 | } | |
275 | rlen = buffer_len(&b); | |
276 | if (rlen != 0) | |
277 | error("do_convert_private_ssh2_from_blob: " | |
278 | "remaining bytes in key blob %d", rlen); | |
279 | buffer_free(&b); | |
280 | ||
281 | /* try the key */ | |
282 | key_sign(key, &sig, &slen, data, sizeof(data)); | |
283 | key_verify(key, sig, slen, data, sizeof(data)); | |
284 | xfree(sig); | |
285 | return key; | |
286 | } | |
287 | ||
288 | static void | |
289 | do_convert_from_ssh2(struct passwd *pw) | |
290 | { | |
291 | Key *k; | |
292 | int blen; | |
293 | u_int len; | |
294 | char line[1024], *p; | |
295 | u_char blob[8096]; | |
296 | char encoded[8096]; | |
297 | struct stat st; | |
298 | int escaped = 0, private = 0, ok; | |
299 | FILE *fp; | |
300 | ||
301 | if (!have_identity) | |
302 | ask_filename(pw, "Enter file in which the key is"); | |
303 | if (stat(identity_file, &st) < 0) { | |
304 | perror(identity_file); | |
305 | exit(1); | |
306 | } | |
307 | fp = fopen(identity_file, "r"); | |
308 | if (fp == NULL) { | |
309 | perror(identity_file); | |
310 | exit(1); | |
311 | } | |
312 | encoded[0] = '\0'; | |
313 | while (fgets(line, sizeof(line), fp)) { | |
314 | if (!(p = strchr(line, '\n'))) { | |
315 | fprintf(stderr, "input line too long.\n"); | |
316 | exit(1); | |
317 | } | |
318 | if (p > line && p[-1] == '\\') | |
319 | escaped++; | |
320 | if (strncmp(line, "----", 4) == 0 || | |
321 | strstr(line, ": ") != NULL) { | |
322 | if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL) | |
323 | private = 1; | |
324 | if (strstr(line, " END ") != NULL) { | |
325 | break; | |
326 | } | |
327 | /* fprintf(stderr, "ignore: %s", line); */ | |
328 | continue; | |
329 | } | |
330 | if (escaped) { | |
331 | escaped--; | |
332 | /* fprintf(stderr, "escaped: %s", line); */ | |
333 | continue; | |
334 | } | |
335 | *p = '\0'; | |
336 | strlcat(encoded, line, sizeof(encoded)); | |
337 | } | |
338 | len = strlen(encoded); | |
339 | if (((len % 4) == 3) && | |
340 | (encoded[len-1] == '=') && | |
341 | (encoded[len-2] == '=') && | |
342 | (encoded[len-3] == '=')) | |
343 | encoded[len-3] = '\0'; | |
344 | blen = uudecode(encoded, blob, sizeof(blob)); | |
345 | if (blen < 0) { | |
346 | fprintf(stderr, "uudecode failed.\n"); | |
347 | exit(1); | |
348 | } | |
349 | k = private ? | |
350 | do_convert_private_ssh2_from_blob(blob, blen) : | |
351 | key_from_blob(blob, blen); | |
352 | if (k == NULL) { | |
353 | fprintf(stderr, "decode blob failed.\n"); | |
354 | exit(1); | |
355 | } | |
356 | ok = private ? | |
357 | (k->type == KEY_DSA ? | |
358 | PEM_write_DSAPrivateKey(stdout, k->dsa, NULL, NULL, 0, NULL, NULL) : | |
359 | PEM_write_RSAPrivateKey(stdout, k->rsa, NULL, NULL, 0, NULL, NULL)) : | |
360 | key_write(k, stdout); | |
361 | if (!ok) { | |
362 | fprintf(stderr, "key write failed"); | |
363 | exit(1); | |
364 | } | |
365 | key_free(k); | |
366 | if (!private) | |
367 | fprintf(stdout, "\n"); | |
368 | fclose(fp); | |
369 | exit(0); | |
370 | } | |
371 | ||
372 | static void | |
373 | do_print_public(struct passwd *pw) | |
374 | { | |
375 | Key *prv; | |
376 | struct stat st; | |
377 | ||
378 | if (!have_identity) | |
379 | ask_filename(pw, "Enter file in which the key is"); | |
380 | if (stat(identity_file, &st) < 0) { | |
381 | perror(identity_file); | |
382 | exit(1); | |
383 | } | |
384 | prv = load_identity(identity_file); | |
385 | if (prv == NULL) { | |
386 | fprintf(stderr, "load failed\n"); | |
387 | exit(1); | |
388 | } | |
389 | if (!key_write(prv, stdout)) | |
390 | fprintf(stderr, "key_write failed"); | |
391 | key_free(prv); | |
392 | fprintf(stdout, "\n"); | |
393 | exit(0); | |
394 | } | |
395 | ||
396 | #ifdef SMARTCARD | |
397 | static void | |
398 | do_upload(struct passwd *pw, const char *sc_reader_id) | |
399 | { | |
400 | Key *prv = NULL; | |
401 | struct stat st; | |
402 | int ret; | |
403 | ||
404 | if (!have_identity) | |
405 | ask_filename(pw, "Enter file in which the key is"); | |
406 | if (stat(identity_file, &st) < 0) { | |
407 | perror(identity_file); | |
408 | exit(1); | |
409 | } | |
410 | prv = load_identity(identity_file); | |
411 | if (prv == NULL) { | |
412 | error("load failed"); | |
413 | exit(1); | |
414 | } | |
415 | ret = sc_put_key(prv, sc_reader_id); | |
416 | key_free(prv); | |
417 | if (ret < 0) | |
418 | exit(1); | |
419 | log("loading key done"); | |
420 | exit(0); | |
421 | } | |
422 | ||
423 | static void | |
424 | do_download(struct passwd *pw, const char *sc_reader_id) | |
425 | { | |
426 | Key **keys = NULL; | |
427 | int i; | |
428 | ||
429 | keys = sc_get_keys(sc_reader_id, NULL); | |
430 | if (keys == NULL) | |
431 | fatal("cannot read public key from smartcard"); | |
432 | for (i = 0; keys[i]; i++) { | |
433 | key_write(keys[i], stdout); | |
434 | key_free(keys[i]); | |
435 | fprintf(stdout, "\n"); | |
436 | } | |
437 | xfree(keys); | |
438 | exit(0); | |
439 | } | |
440 | #endif /* SMARTCARD */ | |
441 | ||
442 | static void | |
443 | do_fingerprint(struct passwd *pw) | |
444 | { | |
445 | FILE *f; | |
446 | Key *public; | |
447 | char *comment = NULL, *cp, *ep, line[16*1024], *fp; | |
448 | int i, skip = 0, num = 1, invalid = 1; | |
449 | enum fp_rep rep; | |
450 | enum fp_type fptype; | |
451 | struct stat st; | |
452 | ||
453 | fptype = print_bubblebabble ? SSH_FP_SHA1 : SSH_FP_MD5; | |
454 | rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_HEX; | |
455 | ||
456 | if (!have_identity) | |
457 | ask_filename(pw, "Enter file in which the key is"); | |
458 | if (stat(identity_file, &st) < 0) { | |
459 | perror(identity_file); | |
460 | exit(1); | |
461 | } | |
462 | public = key_load_public(identity_file, &comment); | |
463 | if (public != NULL) { | |
464 | fp = key_fingerprint(public, fptype, rep); | |
465 | printf("%u %s %s\n", key_size(public), fp, comment); | |
466 | key_free(public); | |
467 | xfree(comment); | |
468 | xfree(fp); | |
469 | exit(0); | |
470 | } | |
471 | if (comment) | |
472 | xfree(comment); | |
473 | ||
474 | f = fopen(identity_file, "r"); | |
475 | if (f != NULL) { | |
476 | while (fgets(line, sizeof(line), f)) { | |
477 | i = strlen(line) - 1; | |
478 | if (line[i] != '\n') { | |
479 | error("line %d too long: %.40s...", num, line); | |
480 | skip = 1; | |
481 | continue; | |
482 | } | |
483 | num++; | |
484 | if (skip) { | |
485 | skip = 0; | |
486 | continue; | |
487 | } | |
488 | line[i] = '\0'; | |
489 | ||
490 | /* Skip leading whitespace, empty and comment lines. */ | |
491 | for (cp = line; *cp == ' ' || *cp == '\t'; cp++) | |
492 | ; | |
493 | if (!*cp || *cp == '\n' || *cp == '#') | |
494 | continue ; | |
495 | i = strtol(cp, &ep, 10); | |
496 | if (i == 0 || ep == NULL || (*ep != ' ' && *ep != '\t')) { | |
497 | int quoted = 0; | |
498 | comment = cp; | |
499 | for (; *cp && (quoted || (*cp != ' ' && | |
500 | *cp != '\t')); cp++) { | |
501 | if (*cp == '\\' && cp[1] == '"') | |
502 | cp++; /* Skip both */ | |
503 | else if (*cp == '"') | |
504 | quoted = !quoted; | |
505 | } | |
506 | if (!*cp) | |
507 | continue; | |
508 | *cp++ = '\0'; | |
509 | } | |
510 | ep = cp; | |
511 | public = key_new(KEY_RSA1); | |
512 | if (key_read(public, &cp) != 1) { | |
513 | cp = ep; | |
514 | key_free(public); | |
515 | public = key_new(KEY_UNSPEC); | |
516 | if (key_read(public, &cp) != 1) { | |
517 | key_free(public); | |
518 | continue; | |
519 | } | |
520 | } | |
521 | comment = *cp ? cp : comment; | |
522 | fp = key_fingerprint(public, fptype, rep); | |
523 | printf("%u %s %s\n", key_size(public), fp, | |
524 | comment ? comment : "no comment"); | |
525 | xfree(fp); | |
526 | key_free(public); | |
527 | invalid = 0; | |
528 | } | |
529 | fclose(f); | |
530 | } | |
531 | if (invalid) { | |
532 | printf("%s is not a public key file.\n", identity_file); | |
533 | exit(1); | |
534 | } | |
535 | exit(0); | |
536 | } | |
537 | ||
538 | /* | |
539 | * Perform changing a passphrase. The argument is the passwd structure | |
540 | * for the current user. | |
541 | */ | |
542 | static void | |
543 | do_change_passphrase(struct passwd *pw) | |
544 | { | |
545 | char *comment; | |
546 | char *old_passphrase, *passphrase1, *passphrase2; | |
547 | struct stat st; | |
548 | Key *private; | |
549 | ||
550 | if (!have_identity) | |
551 | ask_filename(pw, "Enter file in which the key is"); | |
552 | if (stat(identity_file, &st) < 0) { | |
553 | perror(identity_file); | |
554 | exit(1); | |
555 | } | |
556 | /* Try to load the file with empty passphrase. */ | |
557 | private = key_load_private(identity_file, "", &comment); | |
558 | if (private == NULL) { | |
559 | if (identity_passphrase) | |
560 | old_passphrase = xstrdup(identity_passphrase); | |
561 | else | |
562 | old_passphrase = | |
563 | read_passphrase("Enter old passphrase: ", | |
564 | RP_ALLOW_STDIN); | |
565 | private = key_load_private(identity_file, old_passphrase, | |
566 | &comment); | |
567 | memset(old_passphrase, 0, strlen(old_passphrase)); | |
568 | xfree(old_passphrase); | |
569 | if (private == NULL) { | |
570 | printf("Bad passphrase.\n"); | |
571 | exit(1); | |
572 | } | |
573 | } | |
574 | printf("Key has comment '%s'\n", comment); | |
575 | ||
576 | /* Ask the new passphrase (twice). */ | |
577 | if (identity_new_passphrase) { | |
578 | passphrase1 = xstrdup(identity_new_passphrase); | |
579 | passphrase2 = NULL; | |
580 | } else { | |
581 | passphrase1 = | |
582 | read_passphrase("Enter new passphrase (empty for no " | |
583 | "passphrase): ", RP_ALLOW_STDIN); | |
584 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
585 | RP_ALLOW_STDIN); | |
586 | ||
587 | /* Verify that they are the same. */ | |
588 | if (strcmp(passphrase1, passphrase2) != 0) { | |
589 | memset(passphrase1, 0, strlen(passphrase1)); | |
590 | memset(passphrase2, 0, strlen(passphrase2)); | |
591 | xfree(passphrase1); | |
592 | xfree(passphrase2); | |
593 | printf("Pass phrases do not match. Try again.\n"); | |
594 | exit(1); | |
595 | } | |
596 | /* Destroy the other copy. */ | |
597 | memset(passphrase2, 0, strlen(passphrase2)); | |
598 | xfree(passphrase2); | |
599 | } | |
600 | ||
601 | /* Save the file using the new passphrase. */ | |
602 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
603 | printf("Saving the key failed: %s.\n", identity_file); | |
604 | memset(passphrase1, 0, strlen(passphrase1)); | |
605 | xfree(passphrase1); | |
606 | key_free(private); | |
607 | xfree(comment); | |
608 | exit(1); | |
609 | } | |
610 | /* Destroy the passphrase and the copy of the key in memory. */ | |
611 | memset(passphrase1, 0, strlen(passphrase1)); | |
612 | xfree(passphrase1); | |
613 | key_free(private); /* Destroys contents */ | |
614 | xfree(comment); | |
615 | ||
616 | printf("Your identification has been saved with the new passphrase.\n"); | |
617 | exit(0); | |
618 | } | |
619 | ||
620 | /* | |
621 | * Change the comment of a private key file. | |
622 | */ | |
623 | static void | |
624 | do_change_comment(struct passwd *pw) | |
625 | { | |
626 | char new_comment[1024], *comment, *passphrase; | |
627 | Key *private; | |
628 | Key *public; | |
629 | struct stat st; | |
630 | FILE *f; | |
631 | int fd; | |
632 | ||
633 | if (!have_identity) | |
634 | ask_filename(pw, "Enter file in which the key is"); | |
635 | if (stat(identity_file, &st) < 0) { | |
636 | perror(identity_file); | |
637 | exit(1); | |
638 | } | |
639 | private = key_load_private(identity_file, "", &comment); | |
640 | if (private == NULL) { | |
641 | if (identity_passphrase) | |
642 | passphrase = xstrdup(identity_passphrase); | |
643 | else if (identity_new_passphrase) | |
644 | passphrase = xstrdup(identity_new_passphrase); | |
645 | else | |
646 | passphrase = read_passphrase("Enter passphrase: ", | |
647 | RP_ALLOW_STDIN); | |
648 | /* Try to load using the passphrase. */ | |
649 | private = key_load_private(identity_file, passphrase, &comment); | |
650 | if (private == NULL) { | |
651 | memset(passphrase, 0, strlen(passphrase)); | |
652 | xfree(passphrase); | |
653 | printf("Bad passphrase.\n"); | |
654 | exit(1); | |
655 | } | |
656 | } else { | |
657 | passphrase = xstrdup(""); | |
658 | } | |
659 | if (private->type != KEY_RSA1) { | |
660 | fprintf(stderr, "Comments are only supported for RSA1 keys.\n"); | |
661 | key_free(private); | |
662 | exit(1); | |
663 | } | |
664 | printf("Key now has comment '%s'\n", comment); | |
665 | ||
666 | if (identity_comment) { | |
667 | strlcpy(new_comment, identity_comment, sizeof(new_comment)); | |
668 | } else { | |
669 | printf("Enter new comment: "); | |
670 | fflush(stdout); | |
671 | if (!fgets(new_comment, sizeof(new_comment), stdin)) { | |
672 | memset(passphrase, 0, strlen(passphrase)); | |
673 | key_free(private); | |
674 | exit(1); | |
675 | } | |
676 | if (strchr(new_comment, '\n')) | |
677 | *strchr(new_comment, '\n') = 0; | |
678 | } | |
679 | ||
680 | /* Save the file using the new passphrase. */ | |
681 | if (!key_save_private(private, identity_file, passphrase, new_comment)) { | |
682 | printf("Saving the key failed: %s.\n", identity_file); | |
683 | memset(passphrase, 0, strlen(passphrase)); | |
684 | xfree(passphrase); | |
685 | key_free(private); | |
686 | xfree(comment); | |
687 | exit(1); | |
688 | } | |
689 | memset(passphrase, 0, strlen(passphrase)); | |
690 | xfree(passphrase); | |
691 | public = key_from_private(private); | |
692 | key_free(private); | |
693 | ||
694 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
695 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
696 | if (fd == -1) { | |
697 | printf("Could not save your public key in %s\n", identity_file); | |
698 | exit(1); | |
699 | } | |
700 | f = fdopen(fd, "w"); | |
701 | if (f == NULL) { | |
702 | printf("fdopen %s failed", identity_file); | |
703 | exit(1); | |
704 | } | |
705 | if (!key_write(public, f)) | |
706 | fprintf(stderr, "write key failed"); | |
707 | key_free(public); | |
708 | fprintf(f, " %s\n", new_comment); | |
709 | fclose(f); | |
710 | ||
711 | xfree(comment); | |
712 | ||
713 | printf("The comment in your key file has been changed.\n"); | |
714 | exit(0); | |
715 | } | |
716 | ||
717 | static void | |
718 | usage(void) | |
719 | { | |
720 | fprintf(stderr, "Usage: %s [options]\n", __progname); | |
721 | fprintf(stderr, "Options:\n"); | |
722 | fprintf(stderr, " -b bits Number of bits in the key to create.\n"); | |
723 | fprintf(stderr, " -c Change comment in private and public key files.\n"); | |
724 | fprintf(stderr, " -e Convert OpenSSH to IETF SECSH key file.\n"); | |
725 | fprintf(stderr, " -f filename Filename of the key file.\n"); | |
726 | fprintf(stderr, " -i Convert IETF SECSH to OpenSSH key file.\n"); | |
727 | fprintf(stderr, " -l Show fingerprint of key file.\n"); | |
728 | fprintf(stderr, " -p Change passphrase of private key file.\n"); | |
729 | fprintf(stderr, " -q Quiet.\n"); | |
730 | fprintf(stderr, " -y Read private key file and print public key.\n"); | |
731 | fprintf(stderr, " -t type Specify type of key to create.\n"); | |
732 | fprintf(stderr, " -B Show bubblebabble digest of key file.\n"); | |
733 | fprintf(stderr, " -C comment Provide new comment.\n"); | |
734 | fprintf(stderr, " -N phrase Provide new passphrase.\n"); | |
735 | fprintf(stderr, " -P phrase Provide old passphrase.\n"); | |
736 | #ifdef SMARTCARD | |
737 | fprintf(stderr, " -D reader Download public key from smartcard.\n"); | |
738 | fprintf(stderr, " -U reader Upload private key to smartcard.\n"); | |
739 | #endif /* SMARTCARD */ | |
740 | ||
741 | exit(1); | |
742 | } | |
743 | ||
744 | /* | |
745 | * Main program for key management. | |
746 | */ | |
747 | int | |
748 | main(int ac, char **av) | |
749 | { | |
750 | char dotsshdir[MAXPATHLEN], comment[1024], *passphrase1, *passphrase2; | |
751 | char *reader_id = NULL; | |
752 | Key *private, *public; | |
753 | struct passwd *pw; | |
754 | struct stat st; | |
755 | int opt, type, fd, download = 0; | |
756 | FILE *f; | |
757 | ||
758 | extern int optind; | |
759 | extern char *optarg; | |
760 | ||
761 | __progname = get_progname(av[0]); | |
762 | ||
763 | SSLeay_add_all_algorithms(); | |
764 | init_rng(); | |
765 | seed_rng(); | |
766 | ||
767 | /* we need this for the home * directory. */ | |
768 | pw = getpwuid(getuid()); | |
769 | if (!pw) { | |
770 | printf("You don't exist, go away!\n"); | |
771 | exit(1); | |
772 | } | |
773 | if (gethostname(hostname, sizeof(hostname)) < 0) { | |
774 | perror("gethostname"); | |
775 | exit(1); | |
776 | } | |
777 | ||
778 | while ((opt = getopt(ac, av, "deiqpclBRxXyb:f:t:U:D:P:N:C:")) != -1) { | |
779 | switch (opt) { | |
780 | case 'b': | |
781 | bits = atoi(optarg); | |
782 | if (bits < 512 || bits > 32768) { | |
783 | printf("Bits has bad value.\n"); | |
784 | exit(1); | |
785 | } | |
786 | break; | |
787 | case 'l': | |
788 | print_fingerprint = 1; | |
789 | break; | |
790 | case 'B': | |
791 | print_bubblebabble = 1; | |
792 | break; | |
793 | case 'p': | |
794 | change_passphrase = 1; | |
795 | break; | |
796 | case 'c': | |
797 | change_comment = 1; | |
798 | break; | |
799 | case 'f': | |
800 | strlcpy(identity_file, optarg, sizeof(identity_file)); | |
801 | have_identity = 1; | |
802 | break; | |
803 | case 'P': | |
804 | identity_passphrase = optarg; | |
805 | break; | |
806 | case 'N': | |
807 | identity_new_passphrase = optarg; | |
808 | break; | |
809 | case 'C': | |
810 | identity_comment = optarg; | |
811 | break; | |
812 | case 'q': | |
813 | quiet = 1; | |
814 | break; | |
815 | case 'R': | |
816 | /* unused */ | |
817 | exit(0); | |
818 | break; | |
819 | case 'e': | |
820 | case 'x': | |
821 | /* export key */ | |
822 | convert_to_ssh2 = 1; | |
823 | break; | |
824 | case 'i': | |
825 | case 'X': | |
826 | /* import key */ | |
827 | convert_from_ssh2 = 1; | |
828 | break; | |
829 | case 'y': | |
830 | print_public = 1; | |
831 | break; | |
832 | case 'd': | |
833 | key_type_name = "dsa"; | |
834 | break; | |
835 | case 't': | |
836 | key_type_name = optarg; | |
837 | break; | |
838 | case 'D': | |
839 | download = 1; | |
840 | case 'U': | |
841 | reader_id = optarg; | |
842 | break; | |
843 | case '?': | |
844 | default: | |
845 | usage(); | |
846 | } | |
847 | } | |
848 | if (optind < ac) { | |
849 | printf("Too many arguments.\n"); | |
850 | usage(); | |
851 | } | |
852 | if (change_passphrase && change_comment) { | |
853 | printf("Can only have one of -p and -c.\n"); | |
854 | usage(); | |
855 | } | |
856 | if (print_fingerprint || print_bubblebabble) | |
857 | do_fingerprint(pw); | |
858 | if (change_passphrase) | |
859 | do_change_passphrase(pw); | |
860 | if (change_comment) | |
861 | do_change_comment(pw); | |
862 | if (convert_to_ssh2) | |
863 | do_convert_to_ssh2(pw); | |
864 | if (convert_from_ssh2) | |
865 | do_convert_from_ssh2(pw); | |
866 | if (print_public) | |
867 | do_print_public(pw); | |
868 | if (reader_id != NULL) { | |
869 | #ifdef SMARTCARD | |
870 | if (download) | |
871 | do_download(pw, reader_id); | |
872 | else | |
873 | do_upload(pw, reader_id); | |
874 | #else /* SMARTCARD */ | |
875 | fatal("no support for smartcards."); | |
876 | #endif /* SMARTCARD */ | |
877 | } | |
878 | ||
879 | arc4random_stir(); | |
880 | ||
881 | if (key_type_name == NULL) { | |
882 | printf("You must specify a key type (-t).\n"); | |
883 | usage(); | |
884 | } | |
885 | type = key_type_from_name(key_type_name); | |
886 | if (type == KEY_UNSPEC) { | |
887 | fprintf(stderr, "unknown key type %s\n", key_type_name); | |
888 | exit(1); | |
889 | } | |
890 | if (!quiet) | |
891 | printf("Generating public/private %s key pair.\n", key_type_name); | |
892 | private = key_generate(type, bits); | |
893 | if (private == NULL) { | |
894 | fprintf(stderr, "key_generate failed"); | |
895 | exit(1); | |
896 | } | |
897 | public = key_from_private(private); | |
898 | ||
899 | if (!have_identity) | |
900 | ask_filename(pw, "Enter file in which to save the key"); | |
901 | ||
902 | /* Create ~/.ssh directory if it doesn\'t already exist. */ | |
903 | snprintf(dotsshdir, sizeof dotsshdir, "%s/%s", pw->pw_dir, _PATH_SSH_USER_DIR); | |
904 | if (strstr(identity_file, dotsshdir) != NULL && | |
905 | stat(dotsshdir, &st) < 0) { | |
906 | if (mkdir(dotsshdir, 0700) < 0) | |
907 | error("Could not create directory '%s'.", dotsshdir); | |
908 | else if (!quiet) | |
909 | printf("Created directory '%s'.\n", dotsshdir); | |
910 | } | |
911 | /* If the file already exists, ask the user to confirm. */ | |
912 | if (stat(identity_file, &st) >= 0) { | |
913 | char yesno[3]; | |
914 | printf("%s already exists.\n", identity_file); | |
915 | printf("Overwrite (y/n)? "); | |
916 | fflush(stdout); | |
917 | if (fgets(yesno, sizeof(yesno), stdin) == NULL) | |
918 | exit(1); | |
919 | if (yesno[0] != 'y' && yesno[0] != 'Y') | |
920 | exit(1); | |
921 | } | |
922 | /* Ask for a passphrase (twice). */ | |
923 | if (identity_passphrase) | |
924 | passphrase1 = xstrdup(identity_passphrase); | |
925 | else if (identity_new_passphrase) | |
926 | passphrase1 = xstrdup(identity_new_passphrase); | |
927 | else { | |
928 | passphrase_again: | |
929 | passphrase1 = | |
930 | read_passphrase("Enter passphrase (empty for no " | |
931 | "passphrase): ", RP_ALLOW_STDIN); | |
932 | passphrase2 = read_passphrase("Enter same passphrase again: ", | |
933 | RP_ALLOW_STDIN); | |
934 | if (strcmp(passphrase1, passphrase2) != 0) { | |
935 | /* | |
936 | * The passphrases do not match. Clear them and | |
937 | * retry. | |
938 | */ | |
939 | memset(passphrase1, 0, strlen(passphrase1)); | |
940 | memset(passphrase2, 0, strlen(passphrase2)); | |
941 | xfree(passphrase1); | |
942 | xfree(passphrase2); | |
943 | printf("Passphrases do not match. Try again.\n"); | |
944 | goto passphrase_again; | |
945 | } | |
946 | /* Clear the other copy of the passphrase. */ | |
947 | memset(passphrase2, 0, strlen(passphrase2)); | |
948 | xfree(passphrase2); | |
949 | } | |
950 | ||
951 | if (identity_comment) { | |
952 | strlcpy(comment, identity_comment, sizeof(comment)); | |
953 | } else { | |
954 | /* Create default commend field for the passphrase. */ | |
955 | snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname); | |
956 | } | |
957 | ||
958 | /* Save the key with the given passphrase and comment. */ | |
959 | if (!key_save_private(private, identity_file, passphrase1, comment)) { | |
960 | printf("Saving the key failed: %s.\n", identity_file); | |
961 | memset(passphrase1, 0, strlen(passphrase1)); | |
962 | xfree(passphrase1); | |
963 | exit(1); | |
964 | } | |
965 | /* Clear the passphrase. */ | |
966 | memset(passphrase1, 0, strlen(passphrase1)); | |
967 | xfree(passphrase1); | |
968 | ||
969 | /* Clear the private key and the random number generator. */ | |
970 | key_free(private); | |
971 | arc4random_stir(); | |
972 | ||
973 | if (!quiet) | |
974 | printf("Your identification has been saved in %s.\n", identity_file); | |
975 | ||
976 | strlcat(identity_file, ".pub", sizeof(identity_file)); | |
977 | fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644); | |
978 | if (fd == -1) { | |
979 | printf("Could not save your public key in %s\n", identity_file); | |
980 | exit(1); | |
981 | } | |
982 | f = fdopen(fd, "w"); | |
983 | if (f == NULL) { | |
984 | printf("fdopen %s failed", identity_file); | |
985 | exit(1); | |
986 | } | |
987 | if (!key_write(public, f)) | |
988 | fprintf(stderr, "write key failed"); | |
989 | fprintf(f, " %s\n", comment); | |
990 | fclose(f); | |
991 | ||
992 | if (!quiet) { | |
993 | char *fp = key_fingerprint(public, SSH_FP_MD5, SSH_FP_HEX); | |
994 | printf("Your public key has been saved in %s.\n", | |
995 | identity_file); | |
996 | printf("The key fingerprint is:\n"); | |
997 | printf("%s %s\n", fp, comment); | |
998 | xfree(fp); | |
999 | } | |
1000 | ||
1001 | key_free(public); | |
1002 | exit(0); | |
1003 | } |