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ac(8): Staticize and raise WARNS to 6.
[dragonfly.git] / crypto / openssh / ssh-keygen.c
blob835f7d0169ba0315e0d987d17e0506b8539d2e9a
1 /* $OpenBSD: ssh-keygen.c,v 1.307 2017/07/07 03:53:12 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * Identity and host key generation and maintenance.
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15 #include "includes.h"
16
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/stat.h>
20
21 #ifdef WITH_OPENSSL
22 #include <openssl/evp.h>
23 #include <openssl/pem.h>
24 #include "openbsd-compat/openssl-compat.h"
25 #endif
26
27 #include <errno.h>
28 #include <fcntl.h>
29 #include <netdb.h>
30 #ifdef HAVE_PATHS_H
31 # include <paths.h>
32 #endif
33 #include <pwd.h>
34 #include <stdarg.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <locale.h>
41
42 #include "xmalloc.h"
43 #include "sshkey.h"
44 #include "authfile.h"
45 #include "uuencode.h"
46 #include "sshbuf.h"
47 #include "pathnames.h"
48 #include "log.h"
49 #include "misc.h"
50 #include "match.h"
51 #include "hostfile.h"
52 #include "dns.h"
53 #include "ssh.h"
54 #include "ssh2.h"
55 #include "ssherr.h"
56 #include "ssh-pkcs11.h"
57 #include "atomicio.h"
58 #include "krl.h"
59 #include "digest.h"
60 #include "utf8.h"
61 #include "authfd.h"
62
63 #ifdef WITH_OPENSSL
64 # define DEFAULT_KEY_TYPE_NAME "rsa"
65 #else
66 # define DEFAULT_KEY_TYPE_NAME "ed25519"
67 #endif
68
69 /* Number of bits in the RSA/DSA key. This value can be set on the command line. */
70 #define DEFAULT_BITS 2048
71 #define DEFAULT_BITS_DSA 1024
72 #define DEFAULT_BITS_ECDSA 256
73 u_int32_t bits = 0;
74
75 /*
76 * Flag indicating that we just want to change the passphrase. This can be
77 * set on the command line.
78 */
79 int change_passphrase = 0;
80
81 /*
82 * Flag indicating that we just want to change the comment. This can be set
83 * on the command line.
84 */
85 int change_comment = 0;
86
87 int quiet = 0;
88
89 int log_level = SYSLOG_LEVEL_INFO;
90
91 /* Flag indicating that we want to hash a known_hosts file */
92 int hash_hosts = 0;
93 /* Flag indicating that we want lookup a host in known_hosts file */
94 int find_host = 0;
95 /* Flag indicating that we want to delete a host from a known_hosts file */
96 int delete_host = 0;
97
98 /* Flag indicating that we want to show the contents of a certificate */
99 int show_cert = 0;
100
101 /* Flag indicating that we just want to see the key fingerprint */
102 int print_fingerprint = 0;
103 int print_bubblebabble = 0;
104
105 /* Hash algorithm to use for fingerprints. */
106 int fingerprint_hash = SSH_FP_HASH_DEFAULT;
107
108 /* The identity file name, given on the command line or entered by the user. */
109 char identity_file[1024];
110 int have_identity = 0;
111
112 /* This is set to the passphrase if given on the command line. */
113 char *identity_passphrase = NULL;
114
115 /* This is set to the new passphrase if given on the command line. */
116 char *identity_new_passphrase = NULL;
117
118 /* This is set to the new comment if given on the command line. */
119 char *identity_comment = NULL;
120
121 /* Path to CA key when certifying keys. */
122 char *ca_key_path = NULL;
123
124 /* Prefer to use agent keys for CA signing */
125 int prefer_agent = 0;
126
127 /* Certificate serial number */
128 unsigned long long cert_serial = 0;
129
130 /* Key type when certifying */
131 u_int cert_key_type = SSH2_CERT_TYPE_USER;
132
133 /* "key ID" of signed key */
134 char *cert_key_id = NULL;
135
136 /* Comma-separated list of principal names for certifying keys */
137 char *cert_principals = NULL;
138
139 /* Validity period for certificates */
140 u_int64_t cert_valid_from = 0;
141 u_int64_t cert_valid_to = ~0ULL;
142
143 /* Certificate options */
144 #define CERTOPT_X_FWD (1)
145 #define CERTOPT_AGENT_FWD (1<<1)
146 #define CERTOPT_PORT_FWD (1<<2)
147 #define CERTOPT_PTY (1<<3)
148 #define CERTOPT_USER_RC (1<<4)
149 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
150 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
151 u_int32_t certflags_flags = CERTOPT_DEFAULT;
152 char *certflags_command = NULL;
153 char *certflags_src_addr = NULL;
154
155 /* Arbitrary extensions specified by user */
156 struct cert_userext {
157 char *key;
158 char *val;
159 int crit;
160 };
161 struct cert_userext *cert_userext;
162 size_t ncert_userext;
163
164 /* Conversion to/from various formats */
165 int convert_to = 0;
166 int convert_from = 0;
167 enum {
168 FMT_RFC4716,
169 FMT_PKCS8,
170 FMT_PEM
171 } convert_format = FMT_RFC4716;
172 int print_public = 0;
173 int print_generic = 0;
174
175 char *key_type_name = NULL;
176
177 /* Load key from this PKCS#11 provider */
178 char *pkcs11provider = NULL;
179
180 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */
181 int use_new_format = 0;
182
183 /* Cipher for new-format private keys */
184 char *new_format_cipher = NULL;
185
186 /*
187 * Number of KDF rounds to derive new format keys /
188 * number of primality trials when screening moduli.
189 */
190 int rounds = 0;
191
192 /* argv0 */
193 extern char *__progname;
194
195 char hostname[NI_MAXHOST];
196
197 #ifdef WITH_OPENSSL
198 /* moduli.c */
199 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
200 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
201 unsigned long);
202 #endif
203
204 static void
205 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
206 {
207 #ifdef WITH_OPENSSL
208 u_int maxbits, nid;
209 #endif
210
211 if (type == KEY_UNSPEC)
212 fatal("unknown key type %s", key_type_name);
213 if (*bitsp == 0) {
214 #ifdef WITH_OPENSSL
215 if (type == KEY_DSA)
216 *bitsp = DEFAULT_BITS_DSA;
217 else if (type == KEY_ECDSA) {
218 if (name != NULL &&
219 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
220 *bitsp = sshkey_curve_nid_to_bits(nid);
221 if (*bitsp == 0)
222 *bitsp = DEFAULT_BITS_ECDSA;
223 } else
224 #endif
225 *bitsp = DEFAULT_BITS;
226 }
227 #ifdef WITH_OPENSSL
228 maxbits = (type == KEY_DSA) ?
229 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS;
230 if (*bitsp > maxbits)
231 fatal("key bits exceeds maximum %d", maxbits);
232 switch (type) {
233 case KEY_DSA:
234 if (*bitsp != 1024)
235 fatal("Invalid DSA key length: must be 1024 bits");
236 break;
237 case KEY_RSA:
238 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
239 fatal("Invalid RSA key length: minimum is %d bits",
240 SSH_RSA_MINIMUM_MODULUS_SIZE);
241 break;
242 case KEY_ECDSA:
243 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
244 fatal("Invalid ECDSA key length: valid lengths are "
245 "256, 384 or 521 bits");
246 }
247 #endif
248 }
249
250 static void
251 ask_filename(struct passwd *pw, const char *prompt)
252 {
253 char buf[1024];
254 char *name = NULL;
255
256 if (key_type_name == NULL)
257 name = _PATH_SSH_CLIENT_ID_RSA;
258 else {
259 switch (sshkey_type_from_name(key_type_name)) {
260 case KEY_DSA_CERT:
261 case KEY_DSA:
262 name = _PATH_SSH_CLIENT_ID_DSA;
263 break;
264 #ifdef OPENSSL_HAS_ECC
265 case KEY_ECDSA_CERT:
266 case KEY_ECDSA:
267 name = _PATH_SSH_CLIENT_ID_ECDSA;
268 break;
269 #endif
270 case KEY_RSA_CERT:
271 case KEY_RSA:
272 name = _PATH_SSH_CLIENT_ID_RSA;
273 break;
274 case KEY_ED25519:
275 case KEY_ED25519_CERT:
276 name = _PATH_SSH_CLIENT_ID_ED25519;
277 break;
278 default:
279 fatal("bad key type");
280 }
281 }
282 snprintf(identity_file, sizeof(identity_file),
283 "%s/%s", pw->pw_dir, name);
284 printf("%s (%s): ", prompt, identity_file);
285 fflush(stdout);
286 if (fgets(buf, sizeof(buf), stdin) == NULL)
287 exit(1);
288 buf[strcspn(buf, "\n")] = '\0';
289 if (strcmp(buf, "") != 0)
290 strlcpy(identity_file, buf, sizeof(identity_file));
291 have_identity = 1;
292 }
293
294 static struct sshkey *
295 load_identity(char *filename)
296 {
297 char *pass;
298 struct sshkey *prv;
299 int r;
300
301 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0)
302 return prv;
303 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
304 fatal("Load key \"%s\": %s", filename, ssh_err(r));
305 if (identity_passphrase)
306 pass = xstrdup(identity_passphrase);
307 else
308 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
309 r = sshkey_load_private(filename, pass, &prv, NULL);
310 explicit_bzero(pass, strlen(pass));
311 free(pass);
312 if (r != 0)
313 fatal("Load key \"%s\": %s", filename, ssh_err(r));
314 return prv;
315 }
316
317 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
318 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
319 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
320 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
321
322 #ifdef WITH_OPENSSL
323 static void
324 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
325 {
326 size_t len;
327 u_char *blob;
328 char comment[61];
329 int r;
330
331 if ((r = sshkey_to_blob(k, &blob, &len)) != 0)
332 fatal("key_to_blob failed: %s", ssh_err(r));
333 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
334 snprintf(comment, sizeof(comment),
335 "%u-bit %s, converted by %s@%s from OpenSSH",
336 sshkey_size(k), sshkey_type(k),
337 pw->pw_name, hostname);
338
339 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
340 fprintf(stdout, "Comment: \"%s\"\n", comment);
341 dump_base64(stdout, blob, len);
342 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
343 sshkey_free(k);
344 free(blob);
345 exit(0);
346 }
347
348 static void
349 do_convert_to_pkcs8(struct sshkey *k)
350 {
351 switch (sshkey_type_plain(k->type)) {
352 case KEY_RSA:
353 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
354 fatal("PEM_write_RSA_PUBKEY failed");
355 break;
356 case KEY_DSA:
357 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
358 fatal("PEM_write_DSA_PUBKEY failed");
359 break;
360 #ifdef OPENSSL_HAS_ECC
361 case KEY_ECDSA:
362 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
363 fatal("PEM_write_EC_PUBKEY failed");
364 break;
365 #endif
366 default:
367 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
368 }
369 exit(0);
370 }
371
372 static void
373 do_convert_to_pem(struct sshkey *k)
374 {
375 switch (sshkey_type_plain(k->type)) {
376 case KEY_RSA:
377 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
378 fatal("PEM_write_RSAPublicKey failed");
379 break;
380 #if notyet /* OpenSSH 0.9.8 lacks this function */
381 case KEY_DSA:
382 if (!PEM_write_DSAPublicKey(stdout, k->dsa))
383 fatal("PEM_write_DSAPublicKey failed");
384 break;
385 #endif
386 /* XXX ECDSA? */
387 default:
388 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
389 }
390 exit(0);
391 }
392
393 static void
394 do_convert_to(struct passwd *pw)
395 {
396 struct sshkey *k;
397 struct stat st;
398 int r;
399
400 if (!have_identity)
401 ask_filename(pw, "Enter file in which the key is");
402 if (stat(identity_file, &st) < 0)
403 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
404 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
405 k = load_identity(identity_file);
406 switch (convert_format) {
407 case FMT_RFC4716:
408 do_convert_to_ssh2(pw, k);
409 break;
410 case FMT_PKCS8:
411 do_convert_to_pkcs8(k);
412 break;
413 case FMT_PEM:
414 do_convert_to_pem(k);
415 break;
416 default:
417 fatal("%s: unknown key format %d", __func__, convert_format);
418 }
419 exit(0);
420 }
421
422 /*
423 * This is almost exactly the bignum1 encoding, but with 32 bit for length
424 * instead of 16.
425 */
426 static void
427 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
428 {
429 u_int bytes, bignum_bits;
430 int r;
431
432 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
433 fatal("%s: buffer error: %s", __func__, ssh_err(r));
434 bytes = (bignum_bits + 7) / 8;
435 if (sshbuf_len(b) < bytes)
436 fatal("%s: input buffer too small: need %d have %zu",
437 __func__, bytes, sshbuf_len(b));
438 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
439 fatal("%s: BN_bin2bn failed", __func__);
440 if ((r = sshbuf_consume(b, bytes)) != 0)
441 fatal("%s: buffer error: %s", __func__, ssh_err(r));
442 }
443
444 static struct sshkey *
445 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
446 {
447 struct sshbuf *b;
448 struct sshkey *key = NULL;
449 char *type, *cipher;
450 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
451 int r, rlen, ktype;
452 u_int magic, i1, i2, i3, i4;
453 size_t slen;
454 u_long e;
455
456 if ((b = sshbuf_from(blob, blen)) == NULL)
457 fatal("%s: sshbuf_from failed", __func__);
458 if ((r = sshbuf_get_u32(b, &magic)) != 0)
459 fatal("%s: buffer error: %s", __func__, ssh_err(r));
460
461 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
462 error("bad magic 0x%x != 0x%x", magic,
463 SSH_COM_PRIVATE_KEY_MAGIC);
464 sshbuf_free(b);
465 return NULL;
466 }
467 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
468 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
469 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
470 (r = sshbuf_get_u32(b, &i2)) != 0 ||
471 (r = sshbuf_get_u32(b, &i3)) != 0 ||
472 (r = sshbuf_get_u32(b, &i4)) != 0)
473 fatal("%s: buffer error: %s", __func__, ssh_err(r));
474 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
475 if (strcmp(cipher, "none") != 0) {
476 error("unsupported cipher %s", cipher);
477 free(cipher);
478 sshbuf_free(b);
479 free(type);
480 return NULL;
481 }
482 free(cipher);
483
484 if (strstr(type, "dsa")) {
485 ktype = KEY_DSA;
486 } else if (strstr(type, "rsa")) {
487 ktype = KEY_RSA;
488 } else {
489 sshbuf_free(b);
490 free(type);
491 return NULL;
492 }
493 if ((key = sshkey_new_private(ktype)) == NULL)
494 fatal("sshkey_new_private failed");
495 free(type);
496
497 switch (key->type) {
498 case KEY_DSA:
499 buffer_get_bignum_bits(b, key->dsa->p);
500 buffer_get_bignum_bits(b, key->dsa->g);
501 buffer_get_bignum_bits(b, key->dsa->q);
502 buffer_get_bignum_bits(b, key->dsa->pub_key);
503 buffer_get_bignum_bits(b, key->dsa->priv_key);
504 break;
505 case KEY_RSA:
506 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
507 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
508 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
509 fatal("%s: buffer error: %s", __func__, ssh_err(r));
510 e = e1;
511 debug("e %lx", e);
512 if (e < 30) {
513 e <<= 8;
514 e += e2;
515 debug("e %lx", e);
516 e <<= 8;
517 e += e3;
518 debug("e %lx", e);
519 }
520 if (!BN_set_word(key->rsa->e, e)) {
521 sshbuf_free(b);
522 sshkey_free(key);
523 return NULL;
524 }
525 buffer_get_bignum_bits(b, key->rsa->d);
526 buffer_get_bignum_bits(b, key->rsa->n);
527 buffer_get_bignum_bits(b, key->rsa->iqmp);
528 buffer_get_bignum_bits(b, key->rsa->q);
529 buffer_get_bignum_bits(b, key->rsa->p);
530 if ((r = ssh_rsa_generate_additional_parameters(key)) != 0)
531 fatal("generate RSA parameters failed: %s", ssh_err(r));
532 break;
533 }
534 rlen = sshbuf_len(b);
535 if (rlen != 0)
536 error("do_convert_private_ssh2_from_blob: "
537 "remaining bytes in key blob %d", rlen);
538 sshbuf_free(b);
539
540 /* try the key */
541 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 ||
542 sshkey_verify(key, sig, slen, data, sizeof(data), 0) != 0) {
543 sshkey_free(key);
544 free(sig);
545 return NULL;
546 }
547 free(sig);
548 return key;
549 }
550
551 static int
552 get_line(FILE *fp, char *line, size_t len)
553 {
554 int c;
555 size_t pos = 0;
556
557 line[0] = '\0';
558 while ((c = fgetc(fp)) != EOF) {
559 if (pos >= len - 1)
560 fatal("input line too long.");
561 switch (c) {
562 case '\r':
563 c = fgetc(fp);
564 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
565 fatal("unget: %s", strerror(errno));
566 return pos;
567 case '\n':
568 return pos;
569 }
570 line[pos++] = c;
571 line[pos] = '\0';
572 }
573 /* We reached EOF */
574 return -1;
575 }
576
577 static void
578 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
579 {
580 int r, blen, escaped = 0;
581 u_int len;
582 char line[1024];
583 u_char blob[8096];
584 char encoded[8096];
585 FILE *fp;
586
587 if ((fp = fopen(identity_file, "r")) == NULL)
588 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
589 encoded[0] = '\0';
590 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
591 if (blen > 0 && line[blen - 1] == '\\')
592 escaped++;
593 if (strncmp(line, "----", 4) == 0 ||
594 strstr(line, ": ") != NULL) {
595 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
596 *private = 1;
597 if (strstr(line, " END ") != NULL) {
598 break;
599 }
600 /* fprintf(stderr, "ignore: %s", line); */
601 continue;
602 }
603 if (escaped) {
604 escaped--;
605 /* fprintf(stderr, "escaped: %s", line); */
606 continue;
607 }
608 strlcat(encoded, line, sizeof(encoded));
609 }
610 len = strlen(encoded);
611 if (((len % 4) == 3) &&
612 (encoded[len-1] == '=') &&
613 (encoded[len-2] == '=') &&
614 (encoded[len-3] == '='))
615 encoded[len-3] = '\0';
616 blen = uudecode(encoded, blob, sizeof(blob));
617 if (blen < 0)
618 fatal("uudecode failed.");
619 if (*private)
620 *k = do_convert_private_ssh2_from_blob(blob, blen);
621 else if ((r = sshkey_from_blob(blob, blen, k)) != 0)
622 fatal("decode blob failed: %s", ssh_err(r));
623 fclose(fp);
624 }
625
626 static void
627 do_convert_from_pkcs8(struct sshkey **k, int *private)
628 {
629 EVP_PKEY *pubkey;
630 FILE *fp;
631
632 if ((fp = fopen(identity_file, "r")) == NULL)
633 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
634 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
635 fatal("%s: %s is not a recognised public key format", __func__,
636 identity_file);
637 }
638 fclose(fp);
639 switch (EVP_PKEY_type(pubkey->type)) {
640 case EVP_PKEY_RSA:
641 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
642 fatal("sshkey_new failed");
643 (*k)->type = KEY_RSA;
644 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
645 break;
646 case EVP_PKEY_DSA:
647 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
648 fatal("sshkey_new failed");
649 (*k)->type = KEY_DSA;
650 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
651 break;
652 #ifdef OPENSSL_HAS_ECC
653 case EVP_PKEY_EC:
654 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
655 fatal("sshkey_new failed");
656 (*k)->type = KEY_ECDSA;
657 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
658 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
659 break;
660 #endif
661 default:
662 fatal("%s: unsupported pubkey type %d", __func__,
663 EVP_PKEY_type(pubkey->type));
664 }
665 EVP_PKEY_free(pubkey);
666 return;
667 }
668
669 static void
670 do_convert_from_pem(struct sshkey **k, int *private)
671 {
672 FILE *fp;
673 RSA *rsa;
674 #ifdef notyet
675 DSA *dsa;
676 #endif
677
678 if ((fp = fopen(identity_file, "r")) == NULL)
679 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
680 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
681 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
682 fatal("sshkey_new failed");
683 (*k)->type = KEY_RSA;
684 (*k)->rsa = rsa;
685 fclose(fp);
686 return;
687 }
688 #if notyet /* OpenSSH 0.9.8 lacks this function */
689 rewind(fp);
690 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
691 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
692 fatal("sshkey_new failed");
693 (*k)->type = KEY_DSA;
694 (*k)->dsa = dsa;
695 fclose(fp);
696 return;
697 }
698 /* XXX ECDSA */
699 #endif
700 fatal("%s: unrecognised raw private key format", __func__);
701 }
702
703 static void
704 do_convert_from(struct passwd *pw)
705 {
706 struct sshkey *k = NULL;
707 int r, private = 0, ok = 0;
708 struct stat st;
709
710 if (!have_identity)
711 ask_filename(pw, "Enter file in which the key is");
712 if (stat(identity_file, &st) < 0)
713 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
714
715 switch (convert_format) {
716 case FMT_RFC4716:
717 do_convert_from_ssh2(pw, &k, &private);
718 break;
719 case FMT_PKCS8:
720 do_convert_from_pkcs8(&k, &private);
721 break;
722 case FMT_PEM:
723 do_convert_from_pem(&k, &private);
724 break;
725 default:
726 fatal("%s: unknown key format %d", __func__, convert_format);
727 }
728
729 if (!private) {
730 if ((r = sshkey_write(k, stdout)) == 0)
731 ok = 1;
732 if (ok)
733 fprintf(stdout, "\n");
734 } else {
735 switch (k->type) {
736 case KEY_DSA:
737 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
738 NULL, 0, NULL, NULL);
739 break;
740 #ifdef OPENSSL_HAS_ECC
741 case KEY_ECDSA:
742 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
743 NULL, 0, NULL, NULL);
744 break;
745 #endif
746 case KEY_RSA:
747 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
748 NULL, 0, NULL, NULL);
749 break;
750 default:
751 fatal("%s: unsupported key type %s", __func__,
752 sshkey_type(k));
753 }
754 }
755
756 if (!ok)
757 fatal("key write failed");
758 sshkey_free(k);
759 exit(0);
760 }
761 #endif
762
763 static void
764 do_print_public(struct passwd *pw)
765 {
766 struct sshkey *prv;
767 struct stat st;
768 int r;
769
770 if (!have_identity)
771 ask_filename(pw, "Enter file in which the key is");
772 if (stat(identity_file, &st) < 0)
773 fatal("%s: %s", identity_file, strerror(errno));
774 prv = load_identity(identity_file);
775 if ((r = sshkey_write(prv, stdout)) != 0)
776 error("sshkey_write failed: %s", ssh_err(r));
777 sshkey_free(prv);
778 fprintf(stdout, "\n");
779 exit(0);
780 }
781
782 static void
783 do_download(struct passwd *pw)
784 {
785 #ifdef ENABLE_PKCS11
786 struct sshkey **keys = NULL;
787 int i, nkeys;
788 enum sshkey_fp_rep rep;
789 int fptype;
790 char *fp, *ra;
791
792 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
793 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
794
795 pkcs11_init(0);
796 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys);
797 if (nkeys <= 0)
798 fatal("cannot read public key from pkcs11");
799 for (i = 0; i < nkeys; i++) {
800 if (print_fingerprint) {
801 fp = sshkey_fingerprint(keys[i], fptype, rep);
802 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
803 SSH_FP_RANDOMART);
804 if (fp == NULL || ra == NULL)
805 fatal("%s: sshkey_fingerprint fail", __func__);
806 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
807 fp, sshkey_type(keys[i]));
808 if (log_level >= SYSLOG_LEVEL_VERBOSE)
809 printf("%s\n", ra);
810 free(ra);
811 free(fp);
812 } else {
813 (void) sshkey_write(keys[i], stdout); /* XXX check */
814 fprintf(stdout, "\n");
815 }
816 sshkey_free(keys[i]);
817 }
818 free(keys);
819 pkcs11_terminate();
820 exit(0);
821 #else
822 fatal("no pkcs11 support");
823 #endif /* ENABLE_PKCS11 */
824 }
825
826 static struct sshkey *
827 try_read_key(char **cpp)
828 {
829 struct sshkey *ret;
830 int r;
831
832 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
833 fatal("sshkey_new failed");
834 if ((r = sshkey_read(ret, cpp)) == 0)
835 return ret;
836 /* Not a key */
837 sshkey_free(ret);
838 return NULL;
839 }
840
841 static void
842 fingerprint_one_key(const struct sshkey *public, const char *comment)
843 {
844 char *fp = NULL, *ra = NULL;
845 enum sshkey_fp_rep rep;
846 int fptype;
847
848 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
849 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
850 fp = sshkey_fingerprint(public, fptype, rep);
851 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
852 if (fp == NULL || ra == NULL)
853 fatal("%s: sshkey_fingerprint failed", __func__);
854 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
855 comment ? comment : "no comment", sshkey_type(public));
856 if (log_level >= SYSLOG_LEVEL_VERBOSE)
857 printf("%s\n", ra);
858 free(ra);
859 free(fp);
860 }
861
862 static void
863 fingerprint_private(const char *path)
864 {
865 struct stat st;
866 char *comment = NULL;
867 struct sshkey *public = NULL;
868 int r;
869
870 if (stat(identity_file, &st) < 0)
871 fatal("%s: %s", path, strerror(errno));
872 if ((r = sshkey_load_public(path, &public, &comment)) != 0) {
873 debug("load public \"%s\": %s", path, ssh_err(r));
874 if ((r = sshkey_load_private(path, NULL,
875 &public, &comment)) != 0) {
876 debug("load private \"%s\": %s", path, ssh_err(r));
877 fatal("%s is not a key file.", path);
878 }
879 }
880
881 fingerprint_one_key(public, comment);
882 sshkey_free(public);
883 free(comment);
884 }
885
886 static void
887 do_fingerprint(struct passwd *pw)
888 {
889 FILE *f;
890 struct sshkey *public = NULL;
891 char *comment = NULL, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES];
892 int i, invalid = 1;
893 const char *path;
894 u_long lnum = 0;
895
896 if (!have_identity)
897 ask_filename(pw, "Enter file in which the key is");
898 path = identity_file;
899
900 if (strcmp(identity_file, "-") == 0) {
901 f = stdin;
902 path = "(stdin)";
903 } else if ((f = fopen(path, "r")) == NULL)
904 fatal("%s: %s: %s", __progname, path, strerror(errno));
905
906 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) {
907 cp = line;
908 cp[strcspn(cp, "\n")] = '\0';
909 /* Trim leading space and comments */
910 cp = line + strspn(line, " \t");
911 if (*cp == '#' || *cp == '\0')
912 continue;
913
914 /*
915 * Input may be plain keys, private keys, authorized_keys
916 * or known_hosts.
917 */
918
919 /*
920 * Try private keys first. Assume a key is private if
921 * "SSH PRIVATE KEY" appears on the first line and we're
922 * not reading from stdin (XXX support private keys on stdin).
923 */
924 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
925 strstr(cp, "PRIVATE KEY") != NULL) {
926 fclose(f);
927 fingerprint_private(path);
928 exit(0);
929 }
930
931 /*
932 * If it's not a private key, then this must be prepared to
933 * accept a public key prefixed with a hostname or options.
934 * Try a bare key first, otherwise skip the leading stuff.
935 */
936 if ((public = try_read_key(&cp)) == NULL) {
937 i = strtol(cp, &ep, 10);
938 if (i == 0 || ep == NULL ||
939 (*ep != ' ' && *ep != '\t')) {
940 int quoted = 0;
941
942 comment = cp;
943 for (; *cp && (quoted || (*cp != ' ' &&
944 *cp != '\t')); cp++) {
945 if (*cp == '\\' && cp[1] == '"')
946 cp++; /* Skip both */
947 else if (*cp == '"')
948 quoted = !quoted;
949 }
950 if (!*cp)
951 continue;
952 *cp++ = '\0';
953 }
954 }
955 /* Retry after parsing leading hostname/key options */
956 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
957 debug("%s:%lu: not a public key", path, lnum);
958 continue;
959 }
960
961 /* Find trailing comment, if any */
962 for (; *cp == ' ' || *cp == '\t'; cp++)
963 ;
964 if (*cp != '\0' && *cp != '#')
965 comment = cp;
966
967 fingerprint_one_key(public, comment);
968 sshkey_free(public);
969 invalid = 0; /* One good key in the file is sufficient */
970 }
971 fclose(f);
972
973 if (invalid)
974 fatal("%s is not a public key file.", path);
975 exit(0);
976 }
977
978 static void
979 do_gen_all_hostkeys(struct passwd *pw)
980 {
981 struct {
982 char *key_type;
983 char *key_type_display;
984 char *path;
985 } key_types[] = {
986 #ifdef WITH_OPENSSL
987 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
988 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE },
989 #ifdef OPENSSL_HAS_ECC
990 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
991 #endif /* OPENSSL_HAS_ECC */
992 #endif /* WITH_OPENSSL */
993 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
994 { NULL, NULL, NULL }
995 };
996
997 int first = 0;
998 struct stat st;
999 struct sshkey *private, *public;
1000 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1001 int i, type, fd, r;
1002 FILE *f;
1003
1004 for (i = 0; key_types[i].key_type; i++) {
1005 public = private = NULL;
1006 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1007
1008 xasprintf(&prv_file, "%s%s",
1009 identity_file, key_types[i].path);
1010
1011 /* Check whether private key exists and is not zero-length */
1012 if (stat(prv_file, &st) == 0) {
1013 if (st.st_size != 0)
1014 goto next;
1015 } else if (errno != ENOENT) {
1016 error("Could not stat %s: %s", key_types[i].path,
1017 strerror(errno));
1018 goto failnext;
1019 }
1020
1021 /*
1022 * Private key doesn't exist or is invalid; proceed with
1023 * key generation.
1024 */
1025 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1026 identity_file, key_types[i].path);
1027 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1028 identity_file, key_types[i].path);
1029 xasprintf(&pub_file, "%s%s.pub",
1030 identity_file, key_types[i].path);
1031
1032 if (first == 0) {
1033 first = 1;
1034 printf("%s: generating new host keys: ", __progname);
1035 }
1036 printf("%s ", key_types[i].key_type_display);
1037 fflush(stdout);
1038 type = sshkey_type_from_name(key_types[i].key_type);
1039 if ((fd = mkstemp(prv_tmp)) == -1) {
1040 error("Could not save your public key in %s: %s",
1041 prv_tmp, strerror(errno));
1042 goto failnext;
1043 }
1044 close(fd); /* just using mkstemp() to generate/reserve a name */
1045 bits = 0;
1046 type_bits_valid(type, NULL, &bits);
1047 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1048 error("sshkey_generate failed: %s", ssh_err(r));
1049 goto failnext;
1050 }
1051 if ((r = sshkey_from_private(private, &public)) != 0)
1052 fatal("sshkey_from_private failed: %s", ssh_err(r));
1053 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1054 hostname);
1055 if ((r = sshkey_save_private(private, prv_tmp, "",
1056 comment, use_new_format, new_format_cipher, rounds)) != 0) {
1057 error("Saving key \"%s\" failed: %s",
1058 prv_tmp, ssh_err(r));
1059 goto failnext;
1060 }
1061 if ((fd = mkstemp(pub_tmp)) == -1) {
1062 error("Could not save your public key in %s: %s",
1063 pub_tmp, strerror(errno));
1064 goto failnext;
1065 }
1066 (void)fchmod(fd, 0644);
1067 f = fdopen(fd, "w");
1068 if (f == NULL) {
1069 error("fdopen %s failed: %s", pub_tmp, strerror(errno));
1070 close(fd);
1071 goto failnext;
1072 }
1073 if ((r = sshkey_write(public, f)) != 0) {
1074 error("write key failed: %s", ssh_err(r));
1075 fclose(f);
1076 goto failnext;
1077 }
1078 fprintf(f, " %s\n", comment);
1079 if (ferror(f) != 0) {
1080 error("write key failed: %s", strerror(errno));
1081 fclose(f);
1082 goto failnext;
1083 }
1084 if (fclose(f) != 0) {
1085 error("key close failed: %s", strerror(errno));
1086 goto failnext;
1087 }
1088
1089 /* Rename temporary files to their permanent locations. */
1090 if (rename(pub_tmp, pub_file) != 0) {
1091 error("Unable to move %s into position: %s",
1092 pub_file, strerror(errno));
1093 goto failnext;
1094 }
1095 if (rename(prv_tmp, prv_file) != 0) {
1096 error("Unable to move %s into position: %s",
1097 key_types[i].path, strerror(errno));
1098 failnext:
1099 first = 0;
1100 goto next;
1101 }
1102 next:
1103 sshkey_free(private);
1104 sshkey_free(public);
1105 free(prv_tmp);
1106 free(pub_tmp);
1107 free(prv_file);
1108 free(pub_file);
1109 }
1110 if (first != 0)
1111 printf("\n");
1112 }
1113
1114 struct known_hosts_ctx {
1115 const char *host; /* Hostname searched for in find/delete case */
1116 FILE *out; /* Output file, stdout for find_hosts case */
1117 int has_unhashed; /* When hashing, original had unhashed hosts */
1118 int found_key; /* For find/delete, host was found */
1119 int invalid; /* File contained invalid items; don't delete */
1120 };
1121
1122 static int
1123 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1124 {
1125 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1126 char *hashed, *cp, *hosts, *ohosts;
1127 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1128 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1129
1130 switch (l->status) {
1131 case HKF_STATUS_OK:
1132 case HKF_STATUS_MATCHED:
1133 /*
1134 * Don't hash hosts already already hashed, with wildcard
1135 * characters or a CA/revocation marker.
1136 */
1137 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1138 fprintf(ctx->out, "%s\n", l->line);
1139 if (has_wild && !find_host) {
1140 logit("%s:%lu: ignoring host name "
1141 "with wildcard: %.64s", l->path,
1142 l->linenum, l->hosts);
1143 }
1144 return 0;
1145 }
1146 /*
1147 * Split any comma-separated hostnames from the host list,
1148 * hash and store separately.
1149 */
1150 ohosts = hosts = xstrdup(l->hosts);
1151 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1152 lowercase(cp);
1153 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1154 fatal("hash_host failed");
1155 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1156 ctx->has_unhashed = 1;
1157 }
1158 free(ohosts);
1159 return 0;
1160 case HKF_STATUS_INVALID:
1161 /* Retain invalid lines, but mark file as invalid. */
1162 ctx->invalid = 1;
1163 logit("%s:%lu: invalid line", l->path, l->linenum);
1164 /* FALLTHROUGH */
1165 default:
1166 fprintf(ctx->out, "%s\n", l->line);
1167 return 0;
1168 }
1169 /* NOTREACHED */
1170 return -1;
1171 }
1172
1173 static int
1174 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1175 {
1176 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1177 enum sshkey_fp_rep rep;
1178 int fptype;
1179 char *fp;
1180
1181 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1182 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1183
1184 if (l->status == HKF_STATUS_MATCHED) {
1185 if (delete_host) {
1186 if (l->marker != MRK_NONE) {
1187 /* Don't remove CA and revocation lines */
1188 fprintf(ctx->out, "%s\n", l->line);
1189 } else {
1190 /*
1191 * Hostname matches and has no CA/revoke
1192 * marker, delete it by *not* writing the
1193 * line to ctx->out.
1194 */
1195 ctx->found_key = 1;
1196 if (!quiet)
1197 printf("# Host %s found: line %lu\n",
1198 ctx->host, l->linenum);
1199 }
1200 return 0;
1201 } else if (find_host) {
1202 ctx->found_key = 1;
1203 if (!quiet) {
1204 printf("# Host %s found: line %lu %s\n",
1205 ctx->host,
1206 l->linenum, l->marker == MRK_CA ? "CA" :
1207 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1208 }
1209 if (hash_hosts)
1210 known_hosts_hash(l, ctx);
1211 else if (print_fingerprint) {
1212 fp = sshkey_fingerprint(l->key, fptype, rep);
1213 mprintf("%s %s %s %s\n", ctx->host,
1214 sshkey_type(l->key), fp, l->comment);
1215 free(fp);
1216 } else
1217 fprintf(ctx->out, "%s\n", l->line);
1218 return 0;
1219 }
1220 } else if (delete_host) {
1221 /* Retain non-matching hosts when deleting */
1222 if (l->status == HKF_STATUS_INVALID) {
1223 ctx->invalid = 1;
1224 logit("%s:%lu: invalid line", l->path, l->linenum);
1225 }
1226 fprintf(ctx->out, "%s\n", l->line);
1227 }
1228 return 0;
1229 }
1230
1231 static void
1232 do_known_hosts(struct passwd *pw, const char *name)
1233 {
1234 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1235 int r, fd, oerrno, inplace = 0;
1236 struct known_hosts_ctx ctx;
1237 u_int foreach_options;
1238
1239 if (!have_identity) {
1240 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1241 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1242 sizeof(identity_file))
1243 fatal("Specified known hosts path too long");
1244 free(cp);
1245 have_identity = 1;
1246 }
1247
1248 memset(&ctx, 0, sizeof(ctx));
1249 ctx.out = stdout;
1250 ctx.host = name;
1251
1252 /*
1253 * Find hosts goes to stdout, hash and deletions happen in-place
1254 * A corner case is ssh-keygen -HF foo, which should go to stdout
1255 */
1256 if (!find_host && (hash_hosts || delete_host)) {
1257 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1258 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1259 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1260 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1261 fatal("known_hosts path too long");
1262 umask(077);
1263 if ((fd = mkstemp(tmp)) == -1)
1264 fatal("mkstemp: %s", strerror(errno));
1265 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1266 oerrno = errno;
1267 unlink(tmp);
1268 fatal("fdopen: %s", strerror(oerrno));
1269 }
1270 inplace = 1;
1271 }
1272
1273 /* XXX support identity_file == "-" for stdin */
1274 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1275 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1276 if ((r = hostkeys_foreach(identity_file,
1277 hash_hosts ? known_hosts_hash : known_hosts_find_delete, &ctx,
1278 name, NULL, foreach_options)) != 0) {
1279 if (inplace)
1280 unlink(tmp);
1281 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1282 }
1283
1284 if (inplace)
1285 fclose(ctx.out);
1286
1287 if (ctx.invalid) {
1288 error("%s is not a valid known_hosts file.", identity_file);
1289 if (inplace) {
1290 error("Not replacing existing known_hosts "
1291 "file because of errors");
1292 unlink(tmp);
1293 }
1294 exit(1);
1295 } else if (delete_host && !ctx.found_key) {
1296 logit("Host %s not found in %s", name, identity_file);
1297 if (inplace)
1298 unlink(tmp);
1299 } else if (inplace) {
1300 /* Backup existing file */
1301 if (unlink(old) == -1 && errno != ENOENT)
1302 fatal("unlink %.100s: %s", old, strerror(errno));
1303 if (link(identity_file, old) == -1)
1304 fatal("link %.100s to %.100s: %s", identity_file, old,
1305 strerror(errno));
1306 /* Move new one into place */
1307 if (rename(tmp, identity_file) == -1) {
1308 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1309 strerror(errno));
1310 unlink(tmp);
1311 unlink(old);
1312 exit(1);
1313 }
1314
1315 printf("%s updated.\n", identity_file);
1316 printf("Original contents retained as %s\n", old);
1317 if (ctx.has_unhashed) {
1318 logit("WARNING: %s contains unhashed entries", old);
1319 logit("Delete this file to ensure privacy "
1320 "of hostnames");
1321 }
1322 }
1323
1324 exit (find_host && !ctx.found_key);
1325 }
1326
1327 /*
1328 * Perform changing a passphrase. The argument is the passwd structure
1329 * for the current user.
1330 */
1331 static void
1332 do_change_passphrase(struct passwd *pw)
1333 {
1334 char *comment;
1335 char *old_passphrase, *passphrase1, *passphrase2;
1336 struct stat st;
1337 struct sshkey *private;
1338 int r;
1339
1340 if (!have_identity)
1341 ask_filename(pw, "Enter file in which the key is");
1342 if (stat(identity_file, &st) < 0)
1343 fatal("%s: %s", identity_file, strerror(errno));
1344 /* Try to load the file with empty passphrase. */
1345 r = sshkey_load_private(identity_file, "", &private, &comment);
1346 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1347 if (identity_passphrase)
1348 old_passphrase = xstrdup(identity_passphrase);
1349 else
1350 old_passphrase =
1351 read_passphrase("Enter old passphrase: ",
1352 RP_ALLOW_STDIN);
1353 r = sshkey_load_private(identity_file, old_passphrase,
1354 &private, &comment);
1355 explicit_bzero(old_passphrase, strlen(old_passphrase));
1356 free(old_passphrase);
1357 if (r != 0)
1358 goto badkey;
1359 } else if (r != 0) {
1360 badkey:
1361 fatal("Failed to load key %s: %s", identity_file, ssh_err(r));
1362 }
1363 if (comment)
1364 mprintf("Key has comment '%s'\n", comment);
1365
1366 /* Ask the new passphrase (twice). */
1367 if (identity_new_passphrase) {
1368 passphrase1 = xstrdup(identity_new_passphrase);
1369 passphrase2 = NULL;
1370 } else {
1371 passphrase1 =
1372 read_passphrase("Enter new passphrase (empty for no "
1373 "passphrase): ", RP_ALLOW_STDIN);
1374 passphrase2 = read_passphrase("Enter same passphrase again: ",
1375 RP_ALLOW_STDIN);
1376
1377 /* Verify that they are the same. */
1378 if (strcmp(passphrase1, passphrase2) != 0) {
1379 explicit_bzero(passphrase1, strlen(passphrase1));
1380 explicit_bzero(passphrase2, strlen(passphrase2));
1381 free(passphrase1);
1382 free(passphrase2);
1383 printf("Pass phrases do not match. Try again.\n");
1384 exit(1);
1385 }
1386 /* Destroy the other copy. */
1387 explicit_bzero(passphrase2, strlen(passphrase2));
1388 free(passphrase2);
1389 }
1390
1391 /* Save the file using the new passphrase. */
1392 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1393 comment, use_new_format, new_format_cipher, rounds)) != 0) {
1394 error("Saving key \"%s\" failed: %s.",
1395 identity_file, ssh_err(r));
1396 explicit_bzero(passphrase1, strlen(passphrase1));
1397 free(passphrase1);
1398 sshkey_free(private);
1399 free(comment);
1400 exit(1);
1401 }
1402 /* Destroy the passphrase and the copy of the key in memory. */
1403 explicit_bzero(passphrase1, strlen(passphrase1));
1404 free(passphrase1);
1405 sshkey_free(private); /* Destroys contents */
1406 free(comment);
1407
1408 printf("Your identification has been saved with the new passphrase.\n");
1409 exit(0);
1410 }
1411
1412 /*
1413 * Print the SSHFP RR.
1414 */
1415 static int
1416 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
1417 {
1418 struct sshkey *public;
1419 char *comment = NULL;
1420 struct stat st;
1421 int r;
1422
1423 if (fname == NULL)
1424 fatal("%s: no filename", __func__);
1425 if (stat(fname, &st) < 0) {
1426 if (errno == ENOENT)
1427 return 0;
1428 fatal("%s: %s", fname, strerror(errno));
1429 }
1430 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1431 fatal("Failed to read v2 public key from \"%s\": %s.",
1432 fname, ssh_err(r));
1433 export_dns_rr(hname, public, stdout, print_generic);
1434 sshkey_free(public);
1435 free(comment);
1436 return 1;
1437 }
1438
1439 /*
1440 * Change the comment of a private key file.
1441 */
1442 static void
1443 do_change_comment(struct passwd *pw)
1444 {
1445 char new_comment[1024], *comment, *passphrase;
1446 struct sshkey *private;
1447 struct sshkey *public;
1448 struct stat st;
1449 FILE *f;
1450 int r, fd;
1451
1452 if (!have_identity)
1453 ask_filename(pw, "Enter file in which the key is");
1454 if (stat(identity_file, &st) < 0)
1455 fatal("%s: %s", identity_file, strerror(errno));
1456 if ((r = sshkey_load_private(identity_file, "",
1457 &private, &comment)) == 0)
1458 passphrase = xstrdup("");
1459 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1460 fatal("Cannot load private key \"%s\": %s.",
1461 identity_file, ssh_err(r));
1462 else {
1463 if (identity_passphrase)
1464 passphrase = xstrdup(identity_passphrase);
1465 else if (identity_new_passphrase)
1466 passphrase = xstrdup(identity_new_passphrase);
1467 else
1468 passphrase = read_passphrase("Enter passphrase: ",
1469 RP_ALLOW_STDIN);
1470 /* Try to load using the passphrase. */
1471 if ((r = sshkey_load_private(identity_file, passphrase,
1472 &private, &comment)) != 0) {
1473 explicit_bzero(passphrase, strlen(passphrase));
1474 free(passphrase);
1475 fatal("Cannot load private key \"%s\": %s.",
1476 identity_file, ssh_err(r));
1477 }
1478 }
1479
1480 if (private->type != KEY_ED25519 && !use_new_format) {
1481 error("Comments are only supported for keys stored in "
1482 "the new format (-o).");
1483 explicit_bzero(passphrase, strlen(passphrase));
1484 sshkey_free(private);
1485 exit(1);
1486 }
1487 if (comment)
1488 printf("Key now has comment '%s'\n", comment);
1489 else
1490 printf("Key now has no comment\n");
1491
1492 if (identity_comment) {
1493 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1494 } else {
1495 printf("Enter new comment: ");
1496 fflush(stdout);
1497 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1498 explicit_bzero(passphrase, strlen(passphrase));
1499 sshkey_free(private);
1500 exit(1);
1501 }
1502 new_comment[strcspn(new_comment, "\n")] = '\0';
1503 }
1504
1505 /* Save the file using the new passphrase. */
1506 if ((r = sshkey_save_private(private, identity_file, passphrase,
1507 new_comment, use_new_format, new_format_cipher, rounds)) != 0) {
1508 error("Saving key \"%s\" failed: %s",
1509 identity_file, ssh_err(r));
1510 explicit_bzero(passphrase, strlen(passphrase));
1511 free(passphrase);
1512 sshkey_free(private);
1513 free(comment);
1514 exit(1);
1515 }
1516 explicit_bzero(passphrase, strlen(passphrase));
1517 free(passphrase);
1518 if ((r = sshkey_from_private(private, &public)) != 0)
1519 fatal("sshkey_from_private failed: %s", ssh_err(r));
1520 sshkey_free(private);
1521
1522 strlcat(identity_file, ".pub", sizeof(identity_file));
1523 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1524 if (fd == -1)
1525 fatal("Could not save your public key in %s", identity_file);
1526 f = fdopen(fd, "w");
1527 if (f == NULL)
1528 fatal("fdopen %s failed: %s", identity_file, strerror(errno));
1529 if ((r = sshkey_write(public, f)) != 0)
1530 fatal("write key failed: %s", ssh_err(r));
1531 sshkey_free(public);
1532 fprintf(f, " %s\n", new_comment);
1533 fclose(f);
1534
1535 free(comment);
1536
1537 printf("The comment in your key file has been changed.\n");
1538 exit(0);
1539 }
1540
1541 static void
1542 add_flag_option(struct sshbuf *c, const char *name)
1543 {
1544 int r;
1545
1546 debug3("%s: %s", __func__, name);
1547 if ((r = sshbuf_put_cstring(c, name)) != 0 ||
1548 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1549 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1550 }
1551
1552 static void
1553 add_string_option(struct sshbuf *c, const char *name, const char *value)
1554 {
1555 struct sshbuf *b;
1556 int r;
1557
1558 debug3("%s: %s=%s", __func__, name, value);
1559 if ((b = sshbuf_new()) == NULL)
1560 fatal("%s: sshbuf_new failed", __func__);
1561 if ((r = sshbuf_put_cstring(b, value)) != 0 ||
1562 (r = sshbuf_put_cstring(c, name)) != 0 ||
1563 (r = sshbuf_put_stringb(c, b)) != 0)
1564 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1565
1566 sshbuf_free(b);
1567 }
1568
1569 #define OPTIONS_CRITICAL 1
1570 #define OPTIONS_EXTENSIONS 2
1571 static void
1572 prepare_options_buf(struct sshbuf *c, int which)
1573 {
1574 size_t i;
1575
1576 sshbuf_reset(c);
1577 if ((which & OPTIONS_CRITICAL) != 0 &&
1578 certflags_command != NULL)
1579 add_string_option(c, "force-command", certflags_command);
1580 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1581 (certflags_flags & CERTOPT_X_FWD) != 0)
1582 add_flag_option(c, "permit-X11-forwarding");
1583 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1584 (certflags_flags & CERTOPT_AGENT_FWD) != 0)
1585 add_flag_option(c, "permit-agent-forwarding");
1586 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1587 (certflags_flags & CERTOPT_PORT_FWD) != 0)
1588 add_flag_option(c, "permit-port-forwarding");
1589 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1590 (certflags_flags & CERTOPT_PTY) != 0)
1591 add_flag_option(c, "permit-pty");
1592 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1593 (certflags_flags & CERTOPT_USER_RC) != 0)
1594 add_flag_option(c, "permit-user-rc");
1595 if ((which & OPTIONS_CRITICAL) != 0 &&
1596 certflags_src_addr != NULL)
1597 add_string_option(c, "source-address", certflags_src_addr);
1598 for (i = 0; i < ncert_userext; i++) {
1599 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) ||
1600 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL)))
1601 continue;
1602 if (cert_userext[i].val == NULL)
1603 add_flag_option(c, cert_userext[i].key);
1604 else {
1605 add_string_option(c, cert_userext[i].key,
1606 cert_userext[i].val);
1607 }
1608 }
1609 }
1610
1611 static struct sshkey *
1612 load_pkcs11_key(char *path)
1613 {
1614 #ifdef ENABLE_PKCS11
1615 struct sshkey **keys = NULL, *public, *private = NULL;
1616 int r, i, nkeys;
1617
1618 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1619 fatal("Couldn't load CA public key \"%s\": %s",
1620 path, ssh_err(r));
1621
1622 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys);
1623 debug3("%s: %d keys", __func__, nkeys);
1624 if (nkeys <= 0)
1625 fatal("cannot read public key from pkcs11");
1626 for (i = 0; i < nkeys; i++) {
1627 if (sshkey_equal_public(public, keys[i])) {
1628 private = keys[i];
1629 continue;
1630 }
1631 sshkey_free(keys[i]);
1632 }
1633 free(keys);
1634 sshkey_free(public);
1635 return private;
1636 #else
1637 fatal("no pkcs11 support");
1638 #endif /* ENABLE_PKCS11 */
1639 }
1640
1641 /* Signer for sshkey_certify_custom that uses the agent */
1642 static int
1643 agent_signer(const struct sshkey *key, u_char **sigp, size_t *lenp,
1644 const u_char *data, size_t datalen,
1645 const char *alg, u_int compat, void *ctx)
1646 {
1647 int *agent_fdp = (int *)ctx;
1648
1649 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1650 data, datalen, alg, compat);
1651 }
1652
1653 static void
1654 do_ca_sign(struct passwd *pw, int argc, char **argv)
1655 {
1656 int r, i, fd, found, agent_fd = -1;
1657 u_int n;
1658 struct sshkey *ca, *public;
1659 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL;
1660 FILE *f;
1661 struct ssh_identitylist *agent_ids;
1662 size_t j;
1663
1664 #ifdef ENABLE_PKCS11
1665 pkcs11_init(1);
1666 #endif
1667 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1668 if (pkcs11provider != NULL) {
1669 /* If a PKCS#11 token was specified then try to use it */
1670 if ((ca = load_pkcs11_key(tmp)) == NULL)
1671 fatal("No PKCS#11 key matching %s found", ca_key_path);
1672 } else if (prefer_agent) {
1673 /*
1674 * Agent signature requested. Try to use agent after making
1675 * sure the public key specified is actually present in the
1676 * agent.
1677 */
1678 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1679 fatal("Cannot load CA public key %s: %s",
1680 tmp, ssh_err(r));
1681 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1682 fatal("Cannot use public key for CA signature: %s",
1683 ssh_err(r));
1684 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1685 fatal("Retrieve agent key list: %s", ssh_err(r));
1686 found = 0;
1687 for (j = 0; j < agent_ids->nkeys; j++) {
1688 if (sshkey_equal(ca, agent_ids->keys[j])) {
1689 found = 1;
1690 break;
1691 }
1692 }
1693 if (!found)
1694 fatal("CA key %s not found in agent", tmp);
1695 ssh_free_identitylist(agent_ids);
1696 ca->flags |= SSHKEY_FLAG_EXT;
1697 } else {
1698 /* CA key is assumed to be a private key on the filesystem */
1699 ca = load_identity(tmp);
1700 }
1701 free(tmp);
1702
1703 if (key_type_name != NULL &&
1704 sshkey_type_from_name(key_type_name) != ca->type) {
1705 fatal("CA key type %s doesn't match specified %s",
1706 sshkey_ssh_name(ca), key_type_name);
1707 }
1708
1709 for (i = 0; i < argc; i++) {
1710 /* Split list of principals */
1711 n = 0;
1712 if (cert_principals != NULL) {
1713 otmp = tmp = xstrdup(cert_principals);
1714 plist = NULL;
1715 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1716 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1717 if (*(plist[n] = xstrdup(cp)) == '\0')
1718 fatal("Empty principal name");
1719 }
1720 free(otmp);
1721 }
1722
1723 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1724 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1725 fatal("%s: unable to open \"%s\": %s",
1726 __func__, tmp, ssh_err(r));
1727 if (public->type != KEY_RSA && public->type != KEY_DSA &&
1728 public->type != KEY_ECDSA && public->type != KEY_ED25519)
1729 fatal("%s: key \"%s\" type %s cannot be certified",
1730 __func__, tmp, sshkey_type(public));
1731
1732 /* Prepare certificate to sign */
1733 if ((r = sshkey_to_certified(public)) != 0)
1734 fatal("Could not upgrade key %s to certificate: %s",
1735 tmp, ssh_err(r));
1736 public->cert->type = cert_key_type;
1737 public->cert->serial = (u_int64_t)cert_serial;
1738 public->cert->key_id = xstrdup(cert_key_id);
1739 public->cert->nprincipals = n;
1740 public->cert->principals = plist;
1741 public->cert->valid_after = cert_valid_from;
1742 public->cert->valid_before = cert_valid_to;
1743 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1744 prepare_options_buf(public->cert->extensions,
1745 OPTIONS_EXTENSIONS);
1746 if ((r = sshkey_from_private(ca,
1747 &public->cert->signature_key)) != 0)
1748 fatal("sshkey_from_private (ca key): %s", ssh_err(r));
1749
1750 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1751 if ((r = sshkey_certify_custom(public, ca,
1752 key_type_name, agent_signer, &agent_fd)) != 0)
1753 fatal("Couldn't certify key %s via agent: %s",
1754 tmp, ssh_err(r));
1755 } else {
1756 if ((sshkey_certify(public, ca, key_type_name)) != 0)
1757 fatal("Couldn't certify key %s: %s",
1758 tmp, ssh_err(r));
1759 }
1760
1761 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1762 *cp = '\0';
1763 xasprintf(&out, "%s-cert.pub", tmp);
1764 free(tmp);
1765
1766 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
1767 fatal("Could not open \"%s\" for writing: %s", out,
1768 strerror(errno));
1769 if ((f = fdopen(fd, "w")) == NULL)
1770 fatal("%s: fdopen: %s", __func__, strerror(errno));
1771 if ((r = sshkey_write(public, f)) != 0)
1772 fatal("Could not write certified key to %s: %s",
1773 out, ssh_err(r));
1774 fprintf(f, " %s\n", comment);
1775 fclose(f);
1776
1777 if (!quiet) {
1778 sshkey_format_cert_validity(public->cert,
1779 valid, sizeof(valid));
1780 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1781 "valid %s", sshkey_cert_type(public),
1782 out, public->cert->key_id,
1783 (unsigned long long)public->cert->serial,
1784 cert_principals != NULL ? " for " : "",
1785 cert_principals != NULL ? cert_principals : "",
1786 valid);
1787 }
1788
1789 sshkey_free(public);
1790 free(out);
1791 }
1792 #ifdef ENABLE_PKCS11
1793 pkcs11_terminate();
1794 #endif
1795 exit(0);
1796 }
1797
1798 static u_int64_t
1799 parse_relative_time(const char *s, time_t now)
1800 {
1801 int64_t mul, secs;
1802
1803 mul = *s == '-' ? -1 : 1;
1804
1805 if ((secs = convtime(s + 1)) == -1)
1806 fatal("Invalid relative certificate time %s", s);
1807 if (mul == -1 && secs > now)
1808 fatal("Certificate time %s cannot be represented", s);
1809 return now + (u_int64_t)(secs * mul);
1810 }
1811
1812 static u_int64_t
1813 parse_absolute_time(const char *s)
1814 {
1815 struct tm tm;
1816 time_t tt;
1817 char buf[32], *fmt;
1818
1819 /*
1820 * POSIX strptime says "The application shall ensure that there
1821 * is white-space or other non-alphanumeric characters between
1822 * any two conversion specifications" so arrange things this way.
1823 */
1824 switch (strlen(s)) {
1825 case 8:
1826 fmt = "%Y-%m-%d";
1827 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
1828 break;
1829 case 14:
1830 fmt = "%Y-%m-%dT%H:%M:%S";
1831 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
1832 s, s + 4, s + 6, s + 8, s + 10, s + 12);
1833 break;
1834 default:
1835 fatal("Invalid certificate time format %s", s);
1836 }
1837
1838 memset(&tm, 0, sizeof(tm));
1839 if (strptime(buf, fmt, &tm) == NULL)
1840 fatal("Invalid certificate time %s", s);
1841 if ((tt = mktime(&tm)) < 0)
1842 fatal("Certificate time %s cannot be represented", s);
1843 return (u_int64_t)tt;
1844 }
1845
1846 static void
1847 parse_cert_times(char *timespec)
1848 {
1849 char *from, *to;
1850 time_t now = time(NULL);
1851 int64_t secs;
1852
1853 /* +timespec relative to now */
1854 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1855 if ((secs = convtime(timespec + 1)) == -1)
1856 fatal("Invalid relative certificate life %s", timespec);
1857 cert_valid_to = now + secs;
1858 /*
1859 * Backdate certificate one minute to avoid problems on hosts
1860 * with poorly-synchronised clocks.
1861 */
1862 cert_valid_from = ((now - 59)/ 60) * 60;
1863 return;
1864 }
1865
1866 /*
1867 * from:to, where
1868 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1869 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1870 */
1871 from = xstrdup(timespec);
1872 to = strchr(from, ':');
1873 if (to == NULL || from == to || *(to + 1) == '\0')
1874 fatal("Invalid certificate life specification %s", timespec);
1875 *to++ = '\0';
1876
1877 if (*from == '-' || *from == '+')
1878 cert_valid_from = parse_relative_time(from, now);
1879 else
1880 cert_valid_from = parse_absolute_time(from);
1881
1882 if (*to == '-' || *to == '+')
1883 cert_valid_to = parse_relative_time(to, now);
1884 else
1885 cert_valid_to = parse_absolute_time(to);
1886
1887 if (cert_valid_to <= cert_valid_from)
1888 fatal("Empty certificate validity interval");
1889 free(from);
1890 }
1891
1892 static void
1893 add_cert_option(char *opt)
1894 {
1895 char *val, *cp;
1896 int iscrit = 0;
1897
1898 if (strcasecmp(opt, "clear") == 0)
1899 certflags_flags = 0;
1900 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1901 certflags_flags &= ~CERTOPT_X_FWD;
1902 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1903 certflags_flags |= CERTOPT_X_FWD;
1904 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
1905 certflags_flags &= ~CERTOPT_AGENT_FWD;
1906 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
1907 certflags_flags |= CERTOPT_AGENT_FWD;
1908 else if (strcasecmp(opt, "no-port-forwarding") == 0)
1909 certflags_flags &= ~CERTOPT_PORT_FWD;
1910 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
1911 certflags_flags |= CERTOPT_PORT_FWD;
1912 else if (strcasecmp(opt, "no-pty") == 0)
1913 certflags_flags &= ~CERTOPT_PTY;
1914 else if (strcasecmp(opt, "permit-pty") == 0)
1915 certflags_flags |= CERTOPT_PTY;
1916 else if (strcasecmp(opt, "no-user-rc") == 0)
1917 certflags_flags &= ~CERTOPT_USER_RC;
1918 else if (strcasecmp(opt, "permit-user-rc") == 0)
1919 certflags_flags |= CERTOPT_USER_RC;
1920 else if (strncasecmp(opt, "force-command=", 14) == 0) {
1921 val = opt + 14;
1922 if (*val == '\0')
1923 fatal("Empty force-command option");
1924 if (certflags_command != NULL)
1925 fatal("force-command already specified");
1926 certflags_command = xstrdup(val);
1927 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
1928 val = opt + 15;
1929 if (*val == '\0')
1930 fatal("Empty source-address option");
1931 if (certflags_src_addr != NULL)
1932 fatal("source-address already specified");
1933 if (addr_match_cidr_list(NULL, val) != 0)
1934 fatal("Invalid source-address list");
1935 certflags_src_addr = xstrdup(val);
1936 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
1937 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
1938 val = xstrdup(strchr(opt, ':') + 1);
1939 if ((cp = strchr(val, '=')) != NULL)
1940 *cp++ = '\0';
1941 cert_userext = xreallocarray(cert_userext, ncert_userext + 1,
1942 sizeof(*cert_userext));
1943 cert_userext[ncert_userext].key = val;
1944 cert_userext[ncert_userext].val = cp == NULL ?
1945 NULL : xstrdup(cp);
1946 cert_userext[ncert_userext].crit = iscrit;
1947 ncert_userext++;
1948 } else
1949 fatal("Unsupported certificate option \"%s\"", opt);
1950 }
1951
1952 static void
1953 show_options(struct sshbuf *optbuf, int in_critical)
1954 {
1955 char *name, *arg;
1956 struct sshbuf *options, *option = NULL;
1957 int r;
1958
1959 if ((options = sshbuf_fromb(optbuf)) == NULL)
1960 fatal("%s: sshbuf_fromb failed", __func__);
1961 while (sshbuf_len(options) != 0) {
1962 sshbuf_free(option);
1963 option = NULL;
1964 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
1965 (r = sshbuf_froms(options, &option)) != 0)
1966 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1967 printf(" %s", name);
1968 if (!in_critical &&
1969 (strcmp(name, "permit-X11-forwarding") == 0 ||
1970 strcmp(name, "permit-agent-forwarding") == 0 ||
1971 strcmp(name, "permit-port-forwarding") == 0 ||
1972 strcmp(name, "permit-pty") == 0 ||
1973 strcmp(name, "permit-user-rc") == 0))
1974 printf("\n");
1975 else if (in_critical &&
1976 (strcmp(name, "force-command") == 0 ||
1977 strcmp(name, "source-address") == 0)) {
1978 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
1979 fatal("%s: buffer error: %s",
1980 __func__, ssh_err(r));
1981 printf(" %s\n", arg);
1982 free(arg);
1983 } else {
1984 printf(" UNKNOWN OPTION (len %zu)\n",
1985 sshbuf_len(option));
1986 sshbuf_reset(option);
1987 }
1988 free(name);
1989 if (sshbuf_len(option) != 0)
1990 fatal("Option corrupt: extra data at end");
1991 }
1992 sshbuf_free(option);
1993 sshbuf_free(options);
1994 }
1995
1996 static void
1997 print_cert(struct sshkey *key)
1998 {
1999 char valid[64], *key_fp, *ca_fp;
2000 u_int i;
2001
2002 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2003 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2004 fingerprint_hash, SSH_FP_DEFAULT);
2005 if (key_fp == NULL || ca_fp == NULL)
2006 fatal("%s: sshkey_fingerprint fail", __func__);
2007 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2008
2009 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2010 sshkey_cert_type(key));
2011 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2012 printf(" Signing CA: %s %s\n",
2013 sshkey_type(key->cert->signature_key), ca_fp);
2014 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2015 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2016 printf(" Valid: %s\n", valid);
2017 printf(" Principals: ");
2018 if (key->cert->nprincipals == 0)
2019 printf("(none)\n");
2020 else {
2021 for (i = 0; i < key->cert->nprincipals; i++)
2022 printf("\n %s",
2023 key->cert->principals[i]);
2024 printf("\n");
2025 }
2026 printf(" Critical Options: ");
2027 if (sshbuf_len(key->cert->critical) == 0)
2028 printf("(none)\n");
2029 else {
2030 printf("\n");
2031 show_options(key->cert->critical, 1);
2032 }
2033 printf(" Extensions: ");
2034 if (sshbuf_len(key->cert->extensions) == 0)
2035 printf("(none)\n");
2036 else {
2037 printf("\n");
2038 show_options(key->cert->extensions, 0);
2039 }
2040 }
2041
2042 static void
2043 do_show_cert(struct passwd *pw)
2044 {
2045 struct sshkey *key = NULL;
2046 struct stat st;
2047 int r, is_stdin = 0, ok = 0;
2048 FILE *f;
2049 char *cp, line[SSH_MAX_PUBKEY_BYTES];
2050 const char *path;
2051 u_long lnum = 0;
2052
2053 if (!have_identity)
2054 ask_filename(pw, "Enter file in which the key is");
2055 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0)
2056 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2057
2058 path = identity_file;
2059 if (strcmp(path, "-") == 0) {
2060 f = stdin;
2061 path = "(stdin)";
2062 is_stdin = 1;
2063 } else if ((f = fopen(identity_file, "r")) == NULL)
2064 fatal("fopen %s: %s", identity_file, strerror(errno));
2065
2066 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) {
2067 sshkey_free(key);
2068 key = NULL;
2069 /* Trim leading space and comments */
2070 cp = line + strspn(line, " \t");
2071 if (*cp == '#' || *cp == '\0')
2072 continue;
2073 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2074 fatal("sshkey_new");
2075 if ((r = sshkey_read(key, &cp)) != 0) {
2076 error("%s:%lu: invalid key: %s", path,
2077 lnum, ssh_err(r));
2078 continue;
2079 }
2080 if (!sshkey_is_cert(key)) {
2081 error("%s:%lu is not a certificate", path, lnum);
2082 continue;
2083 }
2084 ok = 1;
2085 if (!is_stdin && lnum == 1)
2086 printf("%s:\n", path);
2087 else
2088 printf("%s:%lu:\n", path, lnum);
2089 print_cert(key);
2090 }
2091 sshkey_free(key);
2092 fclose(f);
2093 exit(ok ? 0 : 1);
2094 }
2095
2096 static void
2097 load_krl(const char *path, struct ssh_krl **krlp)
2098 {
2099 struct sshbuf *krlbuf;
2100 int r, fd;
2101
2102 if ((krlbuf = sshbuf_new()) == NULL)
2103 fatal("sshbuf_new failed");
2104 if ((fd = open(path, O_RDONLY)) == -1)
2105 fatal("open %s: %s", path, strerror(errno));
2106 if ((r = sshkey_load_file(fd, krlbuf)) != 0)
2107 fatal("Unable to load KRL: %s", ssh_err(r));
2108 close(fd);
2109 /* XXX check sigs */
2110 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 ||
2111 *krlp == NULL)
2112 fatal("Invalid KRL file: %s", ssh_err(r));
2113 sshbuf_free(krlbuf);
2114 }
2115
2116 static void
2117 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2118 const struct sshkey *ca, struct ssh_krl *krl)
2119 {
2120 struct sshkey *key = NULL;
2121 u_long lnum = 0;
2122 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES];
2123 unsigned long long serial, serial2;
2124 int i, was_explicit_key, was_sha1, r;
2125 FILE *krl_spec;
2126
2127 path = tilde_expand_filename(file, pw->pw_uid);
2128 if (strcmp(path, "-") == 0) {
2129 krl_spec = stdin;
2130 free(path);
2131 path = xstrdup("(standard input)");
2132 } else if ((krl_spec = fopen(path, "r")) == NULL)
2133 fatal("fopen %s: %s", path, strerror(errno));
2134
2135 if (!quiet)
2136 printf("Revoking from %s\n", path);
2137 while (read_keyfile_line(krl_spec, path, line, sizeof(line),
2138 &lnum) == 0) {
2139 was_explicit_key = was_sha1 = 0;
2140 cp = line + strspn(line, " \t");
2141 /* Trim trailing space, comments and strip \n */
2142 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2143 if (cp[i] == '#' || cp[i] == '\n') {
2144 cp[i] = '\0';
2145 break;
2146 }
2147 if (cp[i] == ' ' || cp[i] == '\t') {
2148 /* Remember the start of a span of whitespace */
2149 if (r == -1)
2150 r = i;
2151 } else
2152 r = -1;
2153 }
2154 if (r != -1)
2155 cp[r] = '\0';
2156 if (*cp == '\0')
2157 continue;
2158 if (strncasecmp(cp, "serial:", 7) == 0) {
2159 if (ca == NULL && !wild_ca) {
2160 fatal("revoking certificates by serial number "
2161 "requires specification of a CA key");
2162 }
2163 cp += 7;
2164 cp = cp + strspn(cp, " \t");
2165 errno = 0;
2166 serial = strtoull(cp, &ep, 0);
2167 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2168 fatal("%s:%lu: invalid serial \"%s\"",
2169 path, lnum, cp);
2170 if (errno == ERANGE && serial == ULLONG_MAX)
2171 fatal("%s:%lu: serial out of range",
2172 path, lnum);
2173 serial2 = serial;
2174 if (*ep == '-') {
2175 cp = ep + 1;
2176 errno = 0;
2177 serial2 = strtoull(cp, &ep, 0);
2178 if (*cp == '\0' || *ep != '\0')
2179 fatal("%s:%lu: invalid serial \"%s\"",
2180 path, lnum, cp);
2181 if (errno == ERANGE && serial2 == ULLONG_MAX)
2182 fatal("%s:%lu: serial out of range",
2183 path, lnum);
2184 if (serial2 <= serial)
2185 fatal("%s:%lu: invalid serial range "
2186 "%llu:%llu", path, lnum,
2187 (unsigned long long)serial,
2188 (unsigned long long)serial2);
2189 }
2190 if (ssh_krl_revoke_cert_by_serial_range(krl,
2191 ca, serial, serial2) != 0) {
2192 fatal("%s: revoke serial failed",
2193 __func__);
2194 }
2195 } else if (strncasecmp(cp, "id:", 3) == 0) {
2196 if (ca == NULL && !wild_ca) {
2197 fatal("revoking certificates by key ID "
2198 "requires specification of a CA key");
2199 }
2200 cp += 3;
2201 cp = cp + strspn(cp, " \t");
2202 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2203 fatal("%s: revoke key ID failed", __func__);
2204 } else {
2205 if (strncasecmp(cp, "key:", 4) == 0) {
2206 cp += 4;
2207 cp = cp + strspn(cp, " \t");
2208 was_explicit_key = 1;
2209 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2210 cp += 5;
2211 cp = cp + strspn(cp, " \t");
2212 was_sha1 = 1;
2213 } else {
2214 /*
2215 * Just try to process the line as a key.
2216 * Parsing will fail if it isn't.
2217 */
2218 }
2219 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2220 fatal("sshkey_new");
2221 if ((r = sshkey_read(key, &cp)) != 0)
2222 fatal("%s:%lu: invalid key: %s",
2223 path, lnum, ssh_err(r));
2224 if (was_explicit_key)
2225 r = ssh_krl_revoke_key_explicit(krl, key);
2226 else if (was_sha1)
2227 r = ssh_krl_revoke_key_sha1(krl, key);
2228 else
2229 r = ssh_krl_revoke_key(krl, key);
2230 if (r != 0)
2231 fatal("%s: revoke key failed: %s",
2232 __func__, ssh_err(r));
2233 sshkey_free(key);
2234 }
2235 }
2236 if (strcmp(path, "-") != 0)
2237 fclose(krl_spec);
2238 free(path);
2239 }
2240
2241 static void
2242 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv)
2243 {
2244 struct ssh_krl *krl;
2245 struct stat sb;
2246 struct sshkey *ca = NULL;
2247 int fd, i, r, wild_ca = 0;
2248 char *tmp;
2249 struct sshbuf *kbuf;
2250
2251 if (*identity_file == '\0')
2252 fatal("KRL generation requires an output file");
2253 if (stat(identity_file, &sb) == -1) {
2254 if (errno != ENOENT)
2255 fatal("Cannot access KRL \"%s\": %s",
2256 identity_file, strerror(errno));
2257 if (updating)
2258 fatal("KRL \"%s\" does not exist", identity_file);
2259 }
2260 if (ca_key_path != NULL) {
2261 if (strcasecmp(ca_key_path, "none") == 0)
2262 wild_ca = 1;
2263 else {
2264 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2265 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2266 fatal("Cannot load CA public key %s: %s",
2267 tmp, ssh_err(r));
2268 free(tmp);
2269 }
2270 }
2271
2272 if (updating)
2273 load_krl(identity_file, &krl);
2274 else if ((krl = ssh_krl_init()) == NULL)
2275 fatal("couldn't create KRL");
2276
2277 if (cert_serial != 0)
2278 ssh_krl_set_version(krl, cert_serial);
2279 if (identity_comment != NULL)
2280 ssh_krl_set_comment(krl, identity_comment);
2281
2282 for (i = 0; i < argc; i++)
2283 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2284
2285 if ((kbuf = sshbuf_new()) == NULL)
2286 fatal("sshbuf_new failed");
2287 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0)
2288 fatal("Couldn't generate KRL");
2289 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
2290 fatal("open %s: %s", identity_file, strerror(errno));
2291 if (atomicio(vwrite, fd, (void *)sshbuf_ptr(kbuf), sshbuf_len(kbuf)) !=
2292 sshbuf_len(kbuf))
2293 fatal("write %s: %s", identity_file, strerror(errno));
2294 close(fd);
2295 sshbuf_free(kbuf);
2296 ssh_krl_free(krl);
2297 sshkey_free(ca);
2298 }
2299
2300 static void
2301 do_check_krl(struct passwd *pw, int argc, char **argv)
2302 {
2303 int i, r, ret = 0;
2304 char *comment;
2305 struct ssh_krl *krl;
2306 struct sshkey *k;
2307
2308 if (*identity_file == '\0')
2309 fatal("KRL checking requires an input file");
2310 load_krl(identity_file, &krl);
2311 for (i = 0; i < argc; i++) {
2312 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2313 fatal("Cannot load public key %s: %s",
2314 argv[i], ssh_err(r));
2315 r = ssh_krl_check_key(krl, k);
2316 printf("%s%s%s%s: %s\n", argv[i],
2317 *comment ? " (" : "", comment, *comment ? ")" : "",
2318 r == 0 ? "ok" : "REVOKED");
2319 if (r != 0)
2320 ret = 1;
2321 sshkey_free(k);
2322 free(comment);
2323 }
2324 ssh_krl_free(krl);
2325 exit(ret);
2326 }
2327
2328 static void
2329 usage(void)
2330 {
2331 fprintf(stderr,
2332 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa]\n"
2333 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n"
2334 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n"
2335 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n"
2336 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n"
2337 " ssh-keygen -y [-f input_keyfile]\n"
2338 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n"
2339 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
2340 " ssh-keygen -B [-f input_keyfile]\n");
2341 #ifdef ENABLE_PKCS11
2342 fprintf(stderr,
2343 " ssh-keygen -D pkcs11\n");
2344 #endif
2345 fprintf(stderr,
2346 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n"
2347 " ssh-keygen -H [-f known_hosts_file]\n"
2348 " ssh-keygen -R hostname [-f known_hosts_file]\n"
2349 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n"
2350 #ifdef WITH_OPENSSL
2351 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n"
2352 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n"
2353 " [-j start_line] [-K checkpt] [-W generator]\n"
2354 #endif
2355 " ssh-keygen -s ca_key -I certificate_identity [-h] [-U]\n"
2356 " [-D pkcs11_provider] [-n principals] [-O option]\n"
2357 " [-V validity_interval] [-z serial_number] file ...\n"
2358 " ssh-keygen -L [-f input_keyfile]\n"
2359 " ssh-keygen -A\n"
2360 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
2361 " file ...\n"
2362 " ssh-keygen -Q -f krl_file file ...\n");
2363 exit(1);
2364 }
2365
2366 /*
2367 * Main program for key management.
2368 */
2369 int
2370 main(int argc, char **argv)
2371 {
2372 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2;
2373 char *rr_hostname = NULL, *ep, *fp, *ra;
2374 struct sshkey *private, *public;
2375 struct passwd *pw;
2376 struct stat st;
2377 int r, opt, type, fd;
2378 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
2379 FILE *f;
2380 const char *errstr;
2381 #ifdef WITH_OPENSSL
2382 /* Moduli generation/screening */
2383 char out_file[PATH_MAX], *checkpoint = NULL;
2384 u_int32_t memory = 0, generator_wanted = 0;
2385 int do_gen_candidates = 0, do_screen_candidates = 0;
2386 unsigned long start_lineno = 0, lines_to_process = 0;
2387 BIGNUM *start = NULL;
2388 #endif
2389
2390 extern int optind;
2391 extern char *optarg;
2392
2393 ssh_malloc_init(); /* must be called before any mallocs */
2394 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
2395 sanitise_stdfd();
2396
2397 __progname = ssh_get_progname(argv[0]);
2398
2399 #ifdef WITH_OPENSSL
2400 OpenSSL_add_all_algorithms();
2401 #endif
2402 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
2403
2404 seed_rng();
2405
2406 msetlocale();
2407
2408 /* we need this for the home * directory. */
2409 pw = getpwuid(getuid());
2410 if (!pw)
2411 fatal("No user exists for uid %lu", (u_long)getuid());
2412 if (gethostname(hostname, sizeof(hostname)) < 0)
2413 fatal("gethostname: %s", strerror(errno));
2414
2415 /* Remaining characters: Ydw */
2416 while ((opt = getopt(argc, argv, "ABHLQUXceghiklopquvxy"
2417 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:"
2418 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) {
2419 switch (opt) {
2420 case 'A':
2421 gen_all_hostkeys = 1;
2422 break;
2423 case 'b':
2424 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr);
2425 if (errstr)
2426 fatal("Bits has bad value %s (%s)",
2427 optarg, errstr);
2428 break;
2429 case 'E':
2430 fingerprint_hash = ssh_digest_alg_by_name(optarg);
2431 if (fingerprint_hash == -1)
2432 fatal("Invalid hash algorithm \"%s\"", optarg);
2433 break;
2434 case 'F':
2435 find_host = 1;
2436 rr_hostname = optarg;
2437 break;
2438 case 'H':
2439 hash_hosts = 1;
2440 break;
2441 case 'I':
2442 cert_key_id = optarg;
2443 break;
2444 case 'R':
2445 delete_host = 1;
2446 rr_hostname = optarg;
2447 break;
2448 case 'L':
2449 show_cert = 1;
2450 break;
2451 case 'l':
2452 print_fingerprint = 1;
2453 break;
2454 case 'B':
2455 print_bubblebabble = 1;
2456 break;
2457 case 'm':
2458 if (strcasecmp(optarg, "RFC4716") == 0 ||
2459 strcasecmp(optarg, "ssh2") == 0) {
2460 convert_format = FMT_RFC4716;
2461 break;
2462 }
2463 if (strcasecmp(optarg, "PKCS8") == 0) {
2464 convert_format = FMT_PKCS8;
2465 break;
2466 }
2467 if (strcasecmp(optarg, "PEM") == 0) {
2468 convert_format = FMT_PEM;
2469 break;
2470 }
2471 fatal("Unsupported conversion format \"%s\"", optarg);
2472 case 'n':
2473 cert_principals = optarg;
2474 break;
2475 case 'o':
2476 use_new_format = 1;
2477 break;
2478 case 'p':
2479 change_passphrase = 1;
2480 break;
2481 case 'c':
2482 change_comment = 1;
2483 break;
2484 case 'f':
2485 if (strlcpy(identity_file, optarg,
2486 sizeof(identity_file)) >= sizeof(identity_file))
2487 fatal("Identity filename too long");
2488 have_identity = 1;
2489 break;
2490 case 'g':
2491 print_generic = 1;
2492 break;
2493 case 'P':
2494 identity_passphrase = optarg;
2495 break;
2496 case 'N':
2497 identity_new_passphrase = optarg;
2498 break;
2499 case 'Q':
2500 check_krl = 1;
2501 break;
2502 case 'O':
2503 add_cert_option(optarg);
2504 break;
2505 case 'Z':
2506 new_format_cipher = optarg;
2507 break;
2508 case 'C':
2509 identity_comment = optarg;
2510 break;
2511 case 'q':
2512 quiet = 1;
2513 break;
2514 case 'e':
2515 case 'x':
2516 /* export key */
2517 convert_to = 1;
2518 break;
2519 case 'h':
2520 cert_key_type = SSH2_CERT_TYPE_HOST;
2521 certflags_flags = 0;
2522 break;
2523 case 'k':
2524 gen_krl = 1;
2525 break;
2526 case 'i':
2527 case 'X':
2528 /* import key */
2529 convert_from = 1;
2530 break;
2531 case 'y':
2532 print_public = 1;
2533 break;
2534 case 's':
2535 ca_key_path = optarg;
2536 break;
2537 case 't':
2538 key_type_name = optarg;
2539 break;
2540 case 'D':
2541 pkcs11provider = optarg;
2542 break;
2543 case 'U':
2544 prefer_agent = 1;
2545 break;
2546 case 'u':
2547 update_krl = 1;
2548 break;
2549 case 'v':
2550 if (log_level == SYSLOG_LEVEL_INFO)
2551 log_level = SYSLOG_LEVEL_DEBUG1;
2552 else {
2553 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
2554 log_level < SYSLOG_LEVEL_DEBUG3)
2555 log_level++;
2556 }
2557 break;
2558 case 'r':
2559 rr_hostname = optarg;
2560 break;
2561 case 'a':
2562 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
2563 if (errstr)
2564 fatal("Invalid number: %s (%s)",
2565 optarg, errstr);
2566 break;
2567 case 'V':
2568 parse_cert_times(optarg);
2569 break;
2570 case 'z':
2571 errno = 0;
2572 cert_serial = strtoull(optarg, &ep, 10);
2573 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
2574 (errno == ERANGE && cert_serial == ULLONG_MAX))
2575 fatal("Invalid serial number \"%s\"", optarg);
2576 break;
2577 #ifdef WITH_OPENSSL
2578 /* Moduli generation/screening */
2579 case 'G':
2580 do_gen_candidates = 1;
2581 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
2582 sizeof(out_file))
2583 fatal("Output filename too long");
2584 break;
2585 case 'J':
2586 lines_to_process = strtoul(optarg, NULL, 10);
2587 break;
2588 case 'j':
2589 start_lineno = strtoul(optarg, NULL, 10);
2590 break;
2591 case 'K':
2592 if (strlen(optarg) >= PATH_MAX)
2593 fatal("Checkpoint filename too long");
2594 checkpoint = xstrdup(optarg);
2595 break;
2596 case 'M':
2597 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX,
2598 &errstr);
2599 if (errstr)
2600 fatal("Memory limit is %s: %s", errstr, optarg);
2601 break;
2602 case 'S':
2603 /* XXX - also compare length against bits */
2604 if (BN_hex2bn(&start, optarg) == 0)
2605 fatal("Invalid start point.");
2606 break;
2607 case 'T':
2608 do_screen_candidates = 1;
2609 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
2610 sizeof(out_file))
2611 fatal("Output filename too long");
2612 break;
2613 case 'W':
2614 generator_wanted = (u_int32_t)strtonum(optarg, 1,
2615 UINT_MAX, &errstr);
2616 if (errstr != NULL)
2617 fatal("Desired generator invalid: %s (%s)",
2618 optarg, errstr);
2619 break;
2620 #endif /* WITH_OPENSSL */
2621 case '?':
2622 default:
2623 usage();
2624 }
2625 }
2626
2627 /* reinit */
2628 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
2629
2630 argv += optind;
2631 argc -= optind;
2632
2633 if (ca_key_path != NULL) {
2634 if (argc < 1 && !gen_krl) {
2635 error("Too few arguments.");
2636 usage();
2637 }
2638 } else if (argc > 0 && !gen_krl && !check_krl) {
2639 error("Too many arguments.");
2640 usage();
2641 }
2642 if (change_passphrase && change_comment) {
2643 error("Can only have one of -p and -c.");
2644 usage();
2645 }
2646 if (print_fingerprint && (delete_host || hash_hosts)) {
2647 error("Cannot use -l with -H or -R.");
2648 usage();
2649 }
2650 if (gen_krl) {
2651 do_gen_krl(pw, update_krl, argc, argv);
2652 return (0);
2653 }
2654 if (check_krl) {
2655 do_check_krl(pw, argc, argv);
2656 return (0);
2657 }
2658 if (ca_key_path != NULL) {
2659 if (cert_key_id == NULL)
2660 fatal("Must specify key id (-I) when certifying");
2661 do_ca_sign(pw, argc, argv);
2662 }
2663 if (show_cert)
2664 do_show_cert(pw);
2665 if (delete_host || hash_hosts || find_host)
2666 do_known_hosts(pw, rr_hostname);
2667 if (pkcs11provider != NULL)
2668 do_download(pw);
2669 if (print_fingerprint || print_bubblebabble)
2670 do_fingerprint(pw);
2671 if (change_passphrase)
2672 do_change_passphrase(pw);
2673 if (change_comment)
2674 do_change_comment(pw);
2675 #ifdef WITH_OPENSSL
2676 if (convert_to)
2677 do_convert_to(pw);
2678 if (convert_from)
2679 do_convert_from(pw);
2680 #endif
2681 if (print_public)
2682 do_print_public(pw);
2683 if (rr_hostname != NULL) {
2684 unsigned int n = 0;
2685
2686 if (have_identity) {
2687 n = do_print_resource_record(pw,
2688 identity_file, rr_hostname);
2689 if (n == 0)
2690 fatal("%s: %s", identity_file, strerror(errno));
2691 exit(0);
2692 } else {
2693
2694 n += do_print_resource_record(pw,
2695 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
2696 n += do_print_resource_record(pw,
2697 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
2698 n += do_print_resource_record(pw,
2699 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname);
2700 n += do_print_resource_record(pw,
2701 _PATH_HOST_ED25519_KEY_FILE, rr_hostname);
2702 if (n == 0)
2703 fatal("no keys found.");
2704 exit(0);
2705 }
2706 }
2707
2708 #ifdef WITH_OPENSSL
2709 if (do_gen_candidates) {
2710 FILE *out = fopen(out_file, "w");
2711
2712 if (out == NULL) {
2713 error("Couldn't open modulus candidate file \"%s\": %s",
2714 out_file, strerror(errno));
2715 return (1);
2716 }
2717 if (bits == 0)
2718 bits = DEFAULT_BITS;
2719 if (gen_candidates(out, memory, bits, start) != 0)
2720 fatal("modulus candidate generation failed");
2721
2722 return (0);
2723 }
2724
2725 if (do_screen_candidates) {
2726 FILE *in;
2727 FILE *out = fopen(out_file, "a");
2728
2729 if (have_identity && strcmp(identity_file, "-") != 0) {
2730 if ((in = fopen(identity_file, "r")) == NULL) {
2731 fatal("Couldn't open modulus candidate "
2732 "file \"%s\": %s", identity_file,
2733 strerror(errno));
2734 }
2735 } else
2736 in = stdin;
2737
2738 if (out == NULL) {
2739 fatal("Couldn't open moduli file \"%s\": %s",
2740 out_file, strerror(errno));
2741 }
2742 if (prime_test(in, out, rounds == 0 ? 100 : rounds,
2743 generator_wanted, checkpoint,
2744 start_lineno, lines_to_process) != 0)
2745 fatal("modulus screening failed");
2746 return (0);
2747 }
2748 #endif
2749
2750 if (gen_all_hostkeys) {
2751 do_gen_all_hostkeys(pw);
2752 return (0);
2753 }
2754
2755 if (key_type_name == NULL)
2756 key_type_name = DEFAULT_KEY_TYPE_NAME;
2757
2758 type = sshkey_type_from_name(key_type_name);
2759 type_bits_valid(type, key_type_name, &bits);
2760
2761 if (!quiet)
2762 printf("Generating public/private %s key pair.\n",
2763 key_type_name);
2764 if ((r = sshkey_generate(type, bits, &private)) != 0)
2765 fatal("sshkey_generate failed");
2766 if ((r = sshkey_from_private(private, &public)) != 0)
2767 fatal("sshkey_from_private failed: %s\n", ssh_err(r));
2768
2769 if (!have_identity)
2770 ask_filename(pw, "Enter file in which to save the key");
2771
2772 /* Create ~/.ssh directory if it doesn't already exist. */
2773 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s",
2774 pw->pw_dir, _PATH_SSH_USER_DIR);
2775 if (strstr(identity_file, dotsshdir) != NULL) {
2776 if (stat(dotsshdir, &st) < 0) {
2777 if (errno != ENOENT) {
2778 error("Could not stat %s: %s", dotsshdir,
2779 strerror(errno));
2780 } else if (mkdir(dotsshdir, 0700) < 0) {
2781 error("Could not create directory '%s': %s",
2782 dotsshdir, strerror(errno));
2783 } else if (!quiet)
2784 printf("Created directory '%s'.\n", dotsshdir);
2785 }
2786 }
2787 /* If the file already exists, ask the user to confirm. */
2788 if (stat(identity_file, &st) >= 0) {
2789 char yesno[3];
2790 printf("%s already exists.\n", identity_file);
2791 printf("Overwrite (y/n)? ");
2792 fflush(stdout);
2793 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
2794 exit(1);
2795 if (yesno[0] != 'y' && yesno[0] != 'Y')
2796 exit(1);
2797 }
2798 /* Ask for a passphrase (twice). */
2799 if (identity_passphrase)
2800 passphrase1 = xstrdup(identity_passphrase);
2801 else if (identity_new_passphrase)
2802 passphrase1 = xstrdup(identity_new_passphrase);
2803 else {
2804 passphrase_again:
2805 passphrase1 =
2806 read_passphrase("Enter passphrase (empty for no "
2807 "passphrase): ", RP_ALLOW_STDIN);
2808 passphrase2 = read_passphrase("Enter same passphrase again: ",
2809 RP_ALLOW_STDIN);
2810 if (strcmp(passphrase1, passphrase2) != 0) {
2811 /*
2812 * The passphrases do not match. Clear them and
2813 * retry.
2814 */
2815 explicit_bzero(passphrase1, strlen(passphrase1));
2816 explicit_bzero(passphrase2, strlen(passphrase2));
2817 free(passphrase1);
2818 free(passphrase2);
2819 printf("Passphrases do not match. Try again.\n");
2820 goto passphrase_again;
2821 }
2822 /* Clear the other copy of the passphrase. */
2823 explicit_bzero(passphrase2, strlen(passphrase2));
2824 free(passphrase2);
2825 }
2826
2827 if (identity_comment) {
2828 strlcpy(comment, identity_comment, sizeof(comment));
2829 } else {
2830 /* Create default comment field for the passphrase. */
2831 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
2832 }
2833
2834 /* Save the key with the given passphrase and comment. */
2835 if ((r = sshkey_save_private(private, identity_file, passphrase1,
2836 comment, use_new_format, new_format_cipher, rounds)) != 0) {
2837 error("Saving key \"%s\" failed: %s",
2838 identity_file, ssh_err(r));
2839 explicit_bzero(passphrase1, strlen(passphrase1));
2840 free(passphrase1);
2841 exit(1);
2842 }
2843 /* Clear the passphrase. */
2844 explicit_bzero(passphrase1, strlen(passphrase1));
2845 free(passphrase1);
2846
2847 /* Clear the private key and the random number generator. */
2848 sshkey_free(private);
2849
2850 if (!quiet)
2851 printf("Your identification has been saved in %s.\n", identity_file);
2852
2853 strlcat(identity_file, ".pub", sizeof(identity_file));
2854 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
2855 fatal("Unable to save public key to %s: %s",
2856 identity_file, strerror(errno));
2857 if ((f = fdopen(fd, "w")) == NULL)
2858 fatal("fdopen %s failed: %s", identity_file, strerror(errno));
2859 if ((r = sshkey_write(public, f)) != 0)
2860 error("write key failed: %s", ssh_err(r));
2861 fprintf(f, " %s\n", comment);
2862 fclose(f);
2863
2864 if (!quiet) {
2865 fp = sshkey_fingerprint(public, fingerprint_hash,
2866 SSH_FP_DEFAULT);
2867 ra = sshkey_fingerprint(public, fingerprint_hash,
2868 SSH_FP_RANDOMART);
2869 if (fp == NULL || ra == NULL)
2870 fatal("sshkey_fingerprint failed");
2871 printf("Your public key has been saved in %s.\n",
2872 identity_file);
2873 printf("The key fingerprint is:\n");
2874 printf("%s %s\n", fp, comment);
2875 printf("The key's randomart image is:\n");
2876 printf("%s\n", ra);
2877 free(ra);
2878 free(fp);
2879 }
2880
2881 sshkey_free(public);
2882 exit(0);
2883 }
DragonFly BSD