1 /* $OpenBSD: ssh-keygen.c,v 1.299 2017/03/10 04:26:06 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 "rsa.h"
45 #include "authfile.h"
46 #include "uuencode.h"
47 #include "sshbuf.h"
48 #include "pathnames.h"
49 #include "log.h"
50 #include "misc.h"
51 #include "match.h"
52 #include "hostfile.h"
53 #include "dns.h"
54 #include "ssh.h"
55 #include "ssh2.h"
56 #include "ssherr.h"
57 #include "ssh-pkcs11.h"
58 #include "atomicio.h"
59 #include "krl.h"
60 #include "digest.h"
61 #include "utf8.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 /* Certificate serial number */
125 unsigned long long cert_serial = 0;
126
127 /* Key type when certifying */
128 u_int cert_key_type = SSH2_CERT_TYPE_USER;
129
130 /* "key ID" of signed key */
131 char *cert_key_id = NULL;
132
133 /* Comma-separated list of principal names for certifying keys */
134 char *cert_principals = NULL;
135
136 /* Validity period for certificates */
137 u_int64_t cert_valid_from = 0;
138 u_int64_t cert_valid_to = ~0ULL;
139
140 /* Certificate options */
141 #define CERTOPT_X_FWD (1)
142 #define CERTOPT_AGENT_FWD (1<<1)
143 #define CERTOPT_PORT_FWD (1<<2)
144 #define CERTOPT_PTY (1<<3)
145 #define CERTOPT_USER_RC (1<<4)
146 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
147 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
148 u_int32_t certflags_flags = CERTOPT_DEFAULT;
149 char *certflags_command = NULL;
150 char *certflags_src_addr = NULL;
151
152 /* Conversion to/from various formats */
153 int convert_to = 0;
154 int convert_from = 0;
155 enum {
156 FMT_RFC4716,
157 FMT_PKCS8,
158 FMT_PEM
159 } convert_format = FMT_RFC4716;
160 int print_public = 0;
161 int print_generic = 0;
162
163 char *key_type_name = NULL;
164
165 /* Load key from this PKCS#11 provider */
166 char *pkcs11provider = NULL;
167
168 /* Use new OpenSSH private key format when writing SSH2 keys instead of PEM */
169 int use_new_format = 0;
170
171 /* Cipher for new-format private keys */
172 char *new_format_cipher = NULL;
173
174 /*
175 * Number of KDF rounds to derive new format keys /
176 * number of primality trials when screening moduli.
177 */
178 int rounds = 0;
179
180 /* argv0 */
181 extern char *__progname;
182
183 char hostname[NI_MAXHOST];
184
185 #ifdef WITH_OPENSSL
186 /* moduli.c */
187 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
188 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
189 unsigned long);
190 #endif
191
192 static void
type_bits_valid(int type,const char * name,u_int32_t * bitsp)193 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
194 {
195 #ifdef WITH_OPENSSL
196 u_int maxbits, nid;
197 #endif
198
199 if (type == KEY_UNSPEC)
200 fatal("unknown key type %s", key_type_name);
201 if (*bitsp == 0) {
202 #ifdef WITH_OPENSSL
203 if (type == KEY_DSA)
204 *bitsp = DEFAULT_BITS_DSA;
205 else if (type == KEY_ECDSA) {
206 if (name != NULL &&
207 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
208 *bitsp = sshkey_curve_nid_to_bits(nid);
209 if (*bitsp == 0)
210 *bitsp = DEFAULT_BITS_ECDSA;
211 } else
212 #endif
213 *bitsp = DEFAULT_BITS;
214 }
215 #ifdef WITH_OPENSSL
216 maxbits = (type == KEY_DSA) ?
217 OPENSSL_DSA_MAX_MODULUS_BITS : OPENSSL_RSA_MAX_MODULUS_BITS;
218 if (*bitsp > maxbits)
219 fatal("key bits exceeds maximum %d", maxbits);
220 if (type == KEY_DSA && *bitsp != 1024)
221 fatal("DSA keys must be 1024 bits");
222 else if (type != KEY_ECDSA && type != KEY_ED25519 && *bitsp < 1024)
223 fatal("Key must at least be 1024 bits");
224 else if (type == KEY_ECDSA && sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
225 fatal("Invalid ECDSA key length - valid lengths are "
226 "256, 384 or 521 bits");
227 #endif
228 }
229
230 static void
ask_filename(struct passwd * pw,const char * prompt)231 ask_filename(struct passwd *pw, const char *prompt)
232 {
233 char buf[1024];
234 char *name = NULL;
235
236 if (key_type_name == NULL)
237 name = _PATH_SSH_CLIENT_ID_RSA;
238 else {
239 switch (sshkey_type_from_name(key_type_name)) {
240 case KEY_RSA1:
241 name = _PATH_SSH_CLIENT_IDENTITY;
242 break;
243 case KEY_DSA_CERT:
244 case KEY_DSA:
245 name = _PATH_SSH_CLIENT_ID_DSA;
246 break;
247 #ifdef OPENSSL_HAS_ECC
248 case KEY_ECDSA_CERT:
249 case KEY_ECDSA:
250 name = _PATH_SSH_CLIENT_ID_ECDSA;
251 break;
252 #endif
253 case KEY_RSA_CERT:
254 case KEY_RSA:
255 name = _PATH_SSH_CLIENT_ID_RSA;
256 break;
257 case KEY_ED25519:
258 case KEY_ED25519_CERT:
259 name = _PATH_SSH_CLIENT_ID_ED25519;
260 break;
261 default:
262 fatal("bad key type");
263 }
264 }
265 snprintf(identity_file, sizeof(identity_file),
266 "%s/%s", pw->pw_dir, name);
267 printf("%s (%s): ", prompt, identity_file);
268 fflush(stdout);
269 if (fgets(buf, sizeof(buf), stdin) == NULL)
270 exit(1);
271 buf[strcspn(buf, "\n")] = '\0';
272 if (strcmp(buf, "") != 0)
273 strlcpy(identity_file, buf, sizeof(identity_file));
274 have_identity = 1;
275 }
276
277 static struct sshkey *
load_identity(char * filename)278 load_identity(char *filename)
279 {
280 char *pass;
281 struct sshkey *prv;
282 int r;
283
284 if ((r = sshkey_load_private(filename, "", &prv, NULL)) == 0)
285 return prv;
286 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
287 fatal("Load key \"%s\": %s", filename, ssh_err(r));
288 if (identity_passphrase)
289 pass = xstrdup(identity_passphrase);
290 else
291 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
292 r = sshkey_load_private(filename, pass, &prv, NULL);
293 explicit_bzero(pass, strlen(pass));
294 free(pass);
295 if (r != 0)
296 fatal("Load key \"%s\": %s", filename, ssh_err(r));
297 return prv;
298 }
299
300 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
301 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
302 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
303 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
304
305 #ifdef WITH_OPENSSL
306 static void
do_convert_to_ssh2(struct passwd * pw,struct sshkey * k)307 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
308 {
309 size_t len;
310 u_char *blob;
311 char comment[61];
312 int r;
313
314 if (k->type == KEY_RSA1)
315 fatal("version 1 keys are not supported");
316 if ((r = sshkey_to_blob(k, &blob, &len)) != 0)
317 fatal("key_to_blob failed: %s", ssh_err(r));
318 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
319 snprintf(comment, sizeof(comment),
320 "%u-bit %s, converted by %s@%s from OpenSSH",
321 sshkey_size(k), sshkey_type(k),
322 pw->pw_name, hostname);
323
324 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
325 fprintf(stdout, "Comment: \"%s\"\n", comment);
326 dump_base64(stdout, blob, len);
327 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
328 sshkey_free(k);
329 free(blob);
330 exit(0);
331 }
332
333 static void
do_convert_to_pkcs8(struct sshkey * k)334 do_convert_to_pkcs8(struct sshkey *k)
335 {
336 switch (sshkey_type_plain(k->type)) {
337 case KEY_RSA1:
338 case KEY_RSA:
339 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
340 fatal("PEM_write_RSA_PUBKEY failed");
341 break;
342 case KEY_DSA:
343 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
344 fatal("PEM_write_DSA_PUBKEY failed");
345 break;
346 #ifdef OPENSSL_HAS_ECC
347 case KEY_ECDSA:
348 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
349 fatal("PEM_write_EC_PUBKEY failed");
350 break;
351 #endif
352 default:
353 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
354 }
355 exit(0);
356 }
357
358 static void
do_convert_to_pem(struct sshkey * k)359 do_convert_to_pem(struct sshkey *k)
360 {
361 switch (sshkey_type_plain(k->type)) {
362 case KEY_RSA1:
363 case KEY_RSA:
364 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
365 fatal("PEM_write_RSAPublicKey failed");
366 break;
367 #if notyet /* OpenSSH 0.9.8 lacks this function */
368 case KEY_DSA:
369 if (!PEM_write_DSAPublicKey(stdout, k->dsa))
370 fatal("PEM_write_DSAPublicKey failed");
371 break;
372 #endif
373 /* XXX ECDSA? */
374 default:
375 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
376 }
377 exit(0);
378 }
379
380 static void
do_convert_to(struct passwd * pw)381 do_convert_to(struct passwd *pw)
382 {
383 struct sshkey *k;
384 struct stat st;
385 int r;
386
387 if (!have_identity)
388 ask_filename(pw, "Enter file in which the key is");
389 if (stat(identity_file, &st) < 0)
390 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
391 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
392 k = load_identity(identity_file);
393 switch (convert_format) {
394 case FMT_RFC4716:
395 do_convert_to_ssh2(pw, k);
396 break;
397 case FMT_PKCS8:
398 do_convert_to_pkcs8(k);
399 break;
400 case FMT_PEM:
401 do_convert_to_pem(k);
402 break;
403 default:
404 fatal("%s: unknown key format %d", __func__, convert_format);
405 }
406 exit(0);
407 }
408
409 /*
410 * This is almost exactly the bignum1 encoding, but with 32 bit for length
411 * instead of 16.
412 */
413 static void
buffer_get_bignum_bits(struct sshbuf * b,BIGNUM * value)414 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
415 {
416 u_int bytes, bignum_bits;
417 int r;
418
419 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
420 fatal("%s: buffer error: %s", __func__, ssh_err(r));
421 bytes = (bignum_bits + 7) / 8;
422 if (sshbuf_len(b) < bytes)
423 fatal("%s: input buffer too small: need %d have %zu",
424 __func__, bytes, sshbuf_len(b));
425 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
426 fatal("%s: BN_bin2bn failed", __func__);
427 if ((r = sshbuf_consume(b, bytes)) != 0)
428 fatal("%s: buffer error: %s", __func__, ssh_err(r));
429 }
430
431 static struct sshkey *
do_convert_private_ssh2_from_blob(u_char * blob,u_int blen)432 do_convert_private_ssh2_from_blob(u_char *blob, u_int blen)
433 {
434 struct sshbuf *b;
435 struct sshkey *key = NULL;
436 char *type, *cipher;
437 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
438 int r, rlen, ktype;
439 u_int magic, i1, i2, i3, i4;
440 size_t slen;
441 u_long e;
442
443 if ((b = sshbuf_from(blob, blen)) == NULL)
444 fatal("%s: sshbuf_from failed", __func__);
445 if ((r = sshbuf_get_u32(b, &magic)) != 0)
446 fatal("%s: buffer error: %s", __func__, ssh_err(r));
447
448 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
449 error("bad magic 0x%x != 0x%x", magic,
450 SSH_COM_PRIVATE_KEY_MAGIC);
451 sshbuf_free(b);
452 return NULL;
453 }
454 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
455 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
456 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
457 (r = sshbuf_get_u32(b, &i2)) != 0 ||
458 (r = sshbuf_get_u32(b, &i3)) != 0 ||
459 (r = sshbuf_get_u32(b, &i4)) != 0)
460 fatal("%s: buffer error: %s", __func__, ssh_err(r));
461 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
462 if (strcmp(cipher, "none") != 0) {
463 error("unsupported cipher %s", cipher);
464 free(cipher);
465 sshbuf_free(b);
466 free(type);
467 return NULL;
468 }
469 free(cipher);
470
471 if (strstr(type, "dsa")) {
472 ktype = KEY_DSA;
473 } else if (strstr(type, "rsa")) {
474 ktype = KEY_RSA;
475 } else {
476 sshbuf_free(b);
477 free(type);
478 return NULL;
479 }
480 if ((key = sshkey_new_private(ktype)) == NULL)
481 fatal("key_new_private failed");
482 free(type);
483
484 switch (key->type) {
485 case KEY_DSA:
486 buffer_get_bignum_bits(b, key->dsa->p);
487 buffer_get_bignum_bits(b, key->dsa->g);
488 buffer_get_bignum_bits(b, key->dsa->q);
489 buffer_get_bignum_bits(b, key->dsa->pub_key);
490 buffer_get_bignum_bits(b, key->dsa->priv_key);
491 break;
492 case KEY_RSA:
493 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
494 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
495 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
496 fatal("%s: buffer error: %s", __func__, ssh_err(r));
497 e = e1;
498 debug("e %lx", e);
499 if (e < 30) {
500 e <<= 8;
501 e += e2;
502 debug("e %lx", e);
503 e <<= 8;
504 e += e3;
505 debug("e %lx", e);
506 }
507 if (!BN_set_word(key->rsa->e, e)) {
508 sshbuf_free(b);
509 sshkey_free(key);
510 return NULL;
511 }
512 buffer_get_bignum_bits(b, key->rsa->d);
513 buffer_get_bignum_bits(b, key->rsa->n);
514 buffer_get_bignum_bits(b, key->rsa->iqmp);
515 buffer_get_bignum_bits(b, key->rsa->q);
516 buffer_get_bignum_bits(b, key->rsa->p);
517 if ((r = rsa_generate_additional_parameters(key->rsa)) != 0)
518 fatal("generate RSA parameters failed: %s", ssh_err(r));
519 break;
520 }
521 rlen = sshbuf_len(b);
522 if (rlen != 0)
523 error("do_convert_private_ssh2_from_blob: "
524 "remaining bytes in key blob %d", rlen);
525 sshbuf_free(b);
526
527 /* try the key */
528 if (sshkey_sign(key, &sig, &slen, data, sizeof(data), NULL, 0) != 0 ||
529 sshkey_verify(key, sig, slen, data, sizeof(data), 0) != 0) {
530 sshkey_free(key);
531 free(sig);
532 return NULL;
533 }
534 free(sig);
535 return key;
536 }
537
538 static int
get_line(FILE * fp,char * line,size_t len)539 get_line(FILE *fp, char *line, size_t len)
540 {
541 int c;
542 size_t pos = 0;
543
544 line[0] = '\0';
545 while ((c = fgetc(fp)) != EOF) {
546 if (pos >= len - 1)
547 fatal("input line too long.");
548 switch (c) {
549 case '\r':
550 c = fgetc(fp);
551 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
552 fatal("unget: %s", strerror(errno));
553 return pos;
554 case '\n':
555 return pos;
556 }
557 line[pos++] = c;
558 line[pos] = '\0';
559 }
560 /* We reached EOF */
561 return -1;
562 }
563
564 static void
do_convert_from_ssh2(struct passwd * pw,struct sshkey ** k,int * private)565 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
566 {
567 int r, blen, escaped = 0;
568 u_int len;
569 char line[1024];
570 u_char blob[8096];
571 char encoded[8096];
572 FILE *fp;
573
574 if ((fp = fopen(identity_file, "r")) == NULL)
575 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
576 encoded[0] = '\0';
577 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
578 if (blen > 0 && line[blen - 1] == '\\')
579 escaped++;
580 if (strncmp(line, "----", 4) == 0 ||
581 strstr(line, ": ") != NULL) {
582 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
583 *private = 1;
584 if (strstr(line, " END ") != NULL) {
585 break;
586 }
587 /* fprintf(stderr, "ignore: %s", line); */
588 continue;
589 }
590 if (escaped) {
591 escaped--;
592 /* fprintf(stderr, "escaped: %s", line); */
593 continue;
594 }
595 strlcat(encoded, line, sizeof(encoded));
596 }
597 len = strlen(encoded);
598 if (((len % 4) == 3) &&
599 (encoded[len-1] == '=') &&
600 (encoded[len-2] == '=') &&
601 (encoded[len-3] == '='))
602 encoded[len-3] = '\0';
603 blen = uudecode(encoded, blob, sizeof(blob));
604 if (blen < 0)
605 fatal("uudecode failed.");
606 if (*private)
607 *k = do_convert_private_ssh2_from_blob(blob, blen);
608 else if ((r = sshkey_from_blob(blob, blen, k)) != 0)
609 fatal("decode blob failed: %s", ssh_err(r));
610 fclose(fp);
611 }
612
613 static void
do_convert_from_pkcs8(struct sshkey ** k,int * private)614 do_convert_from_pkcs8(struct sshkey **k, int *private)
615 {
616 EVP_PKEY *pubkey;
617 FILE *fp;
618
619 if ((fp = fopen(identity_file, "r")) == NULL)
620 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
621 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
622 fatal("%s: %s is not a recognised public key format", __func__,
623 identity_file);
624 }
625 fclose(fp);
626 switch (EVP_PKEY_type(pubkey->type)) {
627 case EVP_PKEY_RSA:
628 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
629 fatal("sshkey_new failed");
630 (*k)->type = KEY_RSA;
631 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
632 break;
633 case EVP_PKEY_DSA:
634 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
635 fatal("sshkey_new failed");
636 (*k)->type = KEY_DSA;
637 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
638 break;
639 #ifdef OPENSSL_HAS_ECC
640 case EVP_PKEY_EC:
641 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
642 fatal("sshkey_new failed");
643 (*k)->type = KEY_ECDSA;
644 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
645 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
646 break;
647 #endif
648 default:
649 fatal("%s: unsupported pubkey type %d", __func__,
650 EVP_PKEY_type(pubkey->type));
651 }
652 EVP_PKEY_free(pubkey);
653 return;
654 }
655
656 static void
do_convert_from_pem(struct sshkey ** k,int * private)657 do_convert_from_pem(struct sshkey **k, int *private)
658 {
659 FILE *fp;
660 RSA *rsa;
661 #ifdef notyet
662 DSA *dsa;
663 #endif
664
665 if ((fp = fopen(identity_file, "r")) == NULL)
666 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
667 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
668 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
669 fatal("sshkey_new failed");
670 (*k)->type = KEY_RSA;
671 (*k)->rsa = rsa;
672 fclose(fp);
673 return;
674 }
675 #if notyet /* OpenSSH 0.9.8 lacks this function */
676 rewind(fp);
677 if ((dsa = PEM_read_DSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
678 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
679 fatal("sshkey_new failed");
680 (*k)->type = KEY_DSA;
681 (*k)->dsa = dsa;
682 fclose(fp);
683 return;
684 }
685 /* XXX ECDSA */
686 #endif
687 fatal("%s: unrecognised raw private key format", __func__);
688 }
689
690 static void
do_convert_from(struct passwd * pw)691 do_convert_from(struct passwd *pw)
692 {
693 struct sshkey *k = NULL;
694 int r, private = 0, ok = 0;
695 struct stat st;
696
697 if (!have_identity)
698 ask_filename(pw, "Enter file in which the key is");
699 if (stat(identity_file, &st) < 0)
700 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
701
702 switch (convert_format) {
703 case FMT_RFC4716:
704 do_convert_from_ssh2(pw, &k, &private);
705 break;
706 case FMT_PKCS8:
707 do_convert_from_pkcs8(&k, &private);
708 break;
709 case FMT_PEM:
710 do_convert_from_pem(&k, &private);
711 break;
712 default:
713 fatal("%s: unknown key format %d", __func__, convert_format);
714 }
715
716 if (!private) {
717 if ((r = sshkey_write(k, stdout)) == 0)
718 ok = 1;
719 if (ok)
720 fprintf(stdout, "\n");
721 } else {
722 switch (k->type) {
723 case KEY_DSA:
724 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
725 NULL, 0, NULL, NULL);
726 break;
727 #ifdef OPENSSL_HAS_ECC
728 case KEY_ECDSA:
729 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
730 NULL, 0, NULL, NULL);
731 break;
732 #endif
733 case KEY_RSA:
734 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
735 NULL, 0, NULL, NULL);
736 break;
737 default:
738 fatal("%s: unsupported key type %s", __func__,
739 sshkey_type(k));
740 }
741 }
742
743 if (!ok)
744 fatal("key write failed");
745 sshkey_free(k);
746 exit(0);
747 }
748 #endif
749
750 static void
do_print_public(struct passwd * pw)751 do_print_public(struct passwd *pw)
752 {
753 struct sshkey *prv;
754 struct stat st;
755 int r;
756
757 if (!have_identity)
758 ask_filename(pw, "Enter file in which the key is");
759 if (stat(identity_file, &st) < 0)
760 fatal("%s: %s", identity_file, strerror(errno));
761 prv = load_identity(identity_file);
762 if ((r = sshkey_write(prv, stdout)) != 0)
763 error("key_write failed: %s", ssh_err(r));
764 sshkey_free(prv);
765 fprintf(stdout, "\n");
766 exit(0);
767 }
768
769 static void
do_download(struct passwd * pw)770 do_download(struct passwd *pw)
771 {
772 #ifdef ENABLE_PKCS11
773 struct sshkey **keys = NULL;
774 int i, nkeys;
775 enum sshkey_fp_rep rep;
776 int fptype;
777 char *fp, *ra;
778
779 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
780 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
781
782 pkcs11_init(0);
783 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys);
784 if (nkeys <= 0)
785 fatal("cannot read public key from pkcs11");
786 for (i = 0; i < nkeys; i++) {
787 if (print_fingerprint) {
788 fp = sshkey_fingerprint(keys[i], fptype, rep);
789 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
790 SSH_FP_RANDOMART);
791 if (fp == NULL || ra == NULL)
792 fatal("%s: sshkey_fingerprint fail", __func__);
793 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
794 fp, sshkey_type(keys[i]));
795 if (log_level >= SYSLOG_LEVEL_VERBOSE)
796 printf("%s\n", ra);
797 free(ra);
798 free(fp);
799 } else {
800 (void) sshkey_write(keys[i], stdout); /* XXX check */
801 fprintf(stdout, "\n");
802 }
803 sshkey_free(keys[i]);
804 }
805 free(keys);
806 pkcs11_terminate();
807 exit(0);
808 #else
809 fatal("no pkcs11 support");
810 #endif /* ENABLE_PKCS11 */
811 }
812
813 static struct sshkey *
try_read_key(char ** cpp)814 try_read_key(char **cpp)
815 {
816 struct sshkey *ret;
817 int r;
818
819 if ((ret = sshkey_new(KEY_RSA1)) == NULL)
820 fatal("sshkey_new failed");
821 /* Try RSA1 */
822 if ((r = sshkey_read(ret, cpp)) == 0)
823 return ret;
824 /* Try modern */
825 sshkey_free(ret);
826 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
827 fatal("sshkey_new failed");
828 if ((r = sshkey_read(ret, cpp)) == 0)
829 return ret;
830 /* Not a key */
831 sshkey_free(ret);
832 return NULL;
833 }
834
835 static void
fingerprint_one_key(const struct sshkey * public,const char * comment)836 fingerprint_one_key(const struct sshkey *public, const char *comment)
837 {
838 char *fp = NULL, *ra = NULL;
839 enum sshkey_fp_rep rep;
840 int fptype;
841
842 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
843 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
844 fp = sshkey_fingerprint(public, fptype, rep);
845 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
846 if (fp == NULL || ra == NULL)
847 fatal("%s: sshkey_fingerprint failed", __func__);
848 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
849 comment ? comment : "no comment", sshkey_type(public));
850 if (log_level >= SYSLOG_LEVEL_VERBOSE)
851 printf("%s\n", ra);
852 free(ra);
853 free(fp);
854 }
855
856 static void
fingerprint_private(const char * path)857 fingerprint_private(const char *path)
858 {
859 struct stat st;
860 char *comment = NULL;
861 struct sshkey *public = NULL;
862 int r;
863
864 if (stat(identity_file, &st) < 0)
865 fatal("%s: %s", path, strerror(errno));
866 if ((r = sshkey_load_public(path, &public, &comment)) != 0) {
867 debug("load public \"%s\": %s", path, ssh_err(r));
868 if ((r = sshkey_load_private(path, NULL,
869 &public, &comment)) != 0) {
870 debug("load private \"%s\": %s", path, ssh_err(r));
871 fatal("%s is not a key file.", path);
872 }
873 }
874
875 fingerprint_one_key(public, comment);
876 sshkey_free(public);
877 free(comment);
878 }
879
880 static void
do_fingerprint(struct passwd * pw)881 do_fingerprint(struct passwd *pw)
882 {
883 FILE *f;
884 struct sshkey *public = NULL;
885 char *comment = NULL, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES];
886 int i, invalid = 1;
887 const char *path;
888 u_long lnum = 0;
889
890 if (!have_identity)
891 ask_filename(pw, "Enter file in which the key is");
892 path = identity_file;
893
894 if (strcmp(identity_file, "-") == 0) {
895 f = stdin;
896 path = "(stdin)";
897 } else if ((f = fopen(path, "r")) == NULL)
898 fatal("%s: %s: %s", __progname, path, strerror(errno));
899
900 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) {
901 cp = line;
902 cp[strcspn(cp, "\n")] = '\0';
903 /* Trim leading space and comments */
904 cp = line + strspn(line, " \t");
905 if (*cp == '#' || *cp == '\0')
906 continue;
907
908 /*
909 * Input may be plain keys, private keys, authorized_keys
910 * or known_hosts.
911 */
912
913 /*
914 * Try private keys first. Assume a key is private if
915 * "SSH PRIVATE KEY" appears on the first line and we're
916 * not reading from stdin (XXX support private keys on stdin).
917 */
918 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
919 strstr(cp, "PRIVATE KEY") != NULL) {
920 fclose(f);
921 fingerprint_private(path);
922 exit(0);
923 }
924
925 /*
926 * If it's not a private key, then this must be prepared to
927 * accept a public key prefixed with a hostname or options.
928 * Try a bare key first, otherwise skip the leading stuff.
929 */
930 if ((public = try_read_key(&cp)) == NULL) {
931 i = strtol(cp, &ep, 10);
932 if (i == 0 || ep == NULL ||
933 (*ep != ' ' && *ep != '\t')) {
934 int quoted = 0;
935
936 comment = cp;
937 for (; *cp && (quoted || (*cp != ' ' &&
938 *cp != '\t')); cp++) {
939 if (*cp == '\\' && cp[1] == '"')
940 cp++; /* Skip both */
941 else if (*cp == '"')
942 quoted = !quoted;
943 }
944 if (!*cp)
945 continue;
946 *cp++ = '\0';
947 }
948 }
949 /* Retry after parsing leading hostname/key options */
950 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
951 debug("%s:%lu: not a public key", path, lnum);
952 continue;
953 }
954
955 /* Find trailing comment, if any */
956 for (; *cp == ' ' || *cp == '\t'; cp++)
957 ;
958 if (*cp != '\0' && *cp != '#')
959 comment = cp;
960
961 fingerprint_one_key(public, comment);
962 sshkey_free(public);
963 invalid = 0; /* One good key in the file is sufficient */
964 }
965 fclose(f);
966
967 if (invalid)
968 fatal("%s is not a public key file.", path);
969 exit(0);
970 }
971
972 static void
do_gen_all_hostkeys(struct passwd * pw)973 do_gen_all_hostkeys(struct passwd *pw)
974 {
975 struct {
976 char *key_type;
977 char *key_type_display;
978 char *path;
979 } key_types[] = {
980 #ifdef WITH_OPENSSL
981 #ifdef WITH_SSH1
982 { "rsa1", "RSA1", _PATH_HOST_KEY_FILE },
983 #endif /* WITH_SSH1 */
984 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
985 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE },
986 #ifdef OPENSSL_HAS_ECC
987 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
988 #endif /* OPENSSL_HAS_ECC */
989 #endif /* WITH_OPENSSL */
990 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
991 { NULL, NULL, NULL }
992 };
993
994 int first = 0;
995 struct stat st;
996 struct sshkey *private, *public;
997 char comment[1024];
998 int i, type, fd, r;
999 FILE *f;
1000
1001 for (i = 0; key_types[i].key_type; i++) {
1002 if (stat(key_types[i].path, &st) == 0)
1003 continue;
1004 if (errno != ENOENT) {
1005 error("Could not stat %s: %s", key_types[i].path,
1006 strerror(errno));
1007 first = 0;
1008 continue;
1009 }
1010
1011 if (first == 0) {
1012 first = 1;
1013 printf("%s: generating new host keys: ", __progname);
1014 }
1015 printf("%s ", key_types[i].key_type_display);
1016 fflush(stdout);
1017 type = sshkey_type_from_name(key_types[i].key_type);
1018 strlcpy(identity_file, key_types[i].path, sizeof(identity_file));
1019 bits = 0;
1020 type_bits_valid(type, NULL, &bits);
1021 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1022 error("key_generate failed: %s", ssh_err(r));
1023 first = 0;
1024 continue;
1025 }
1026 if ((r = sshkey_from_private(private, &public)) != 0)
1027 fatal("sshkey_from_private failed: %s", ssh_err(r));
1028 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1029 hostname);
1030 if ((r = sshkey_save_private(private, identity_file, "",
1031 comment, use_new_format, new_format_cipher, rounds)) != 0) {
1032 error("Saving key \"%s\" failed: %s",
1033 identity_file, ssh_err(r));
1034 sshkey_free(private);
1035 sshkey_free(public);
1036 first = 0;
1037 continue;
1038 }
1039 sshkey_free(private);
1040 strlcat(identity_file, ".pub", sizeof(identity_file));
1041 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1042 if (fd == -1) {
1043 error("Could not save your public key in %s",
1044 identity_file);
1045 sshkey_free(public);
1046 first = 0;
1047 continue;
1048 }
1049 f = fdopen(fd, "w");
1050 if (f == NULL) {
1051 error("fdopen %s failed", identity_file);
1052 close(fd);
1053 sshkey_free(public);
1054 first = 0;
1055 continue;
1056 }
1057 if ((r = sshkey_write(public, f)) != 0) {
1058 error("write key failed: %s", ssh_err(r));
1059 fclose(f);
1060 sshkey_free(public);
1061 first = 0;
1062 continue;
1063 }
1064 fprintf(f, " %s\n", comment);
1065 fclose(f);
1066 sshkey_free(public);
1067
1068 }
1069 if (first != 0)
1070 printf("\n");
1071 }
1072
1073 struct known_hosts_ctx {
1074 const char *host; /* Hostname searched for in find/delete case */
1075 FILE *out; /* Output file, stdout for find_hosts case */
1076 int has_unhashed; /* When hashing, original had unhashed hosts */
1077 int found_key; /* For find/delete, host was found */
1078 int invalid; /* File contained invalid items; don't delete */
1079 };
1080
1081 static int
known_hosts_hash(struct hostkey_foreach_line * l,void * _ctx)1082 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1083 {
1084 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1085 char *hashed, *cp, *hosts, *ohosts;
1086 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1087 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1088
1089 switch (l->status) {
1090 case HKF_STATUS_OK:
1091 case HKF_STATUS_MATCHED:
1092 /*
1093 * Don't hash hosts already already hashed, with wildcard
1094 * characters or a CA/revocation marker.
1095 */
1096 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1097 fprintf(ctx->out, "%s\n", l->line);
1098 if (has_wild && !find_host) {
1099 logit("%s:%lu: ignoring host name "
1100 "with wildcard: %.64s", l->path,
1101 l->linenum, l->hosts);
1102 }
1103 return 0;
1104 }
1105 /*
1106 * Split any comma-separated hostnames from the host list,
1107 * hash and store separately.
1108 */
1109 ohosts = hosts = xstrdup(l->hosts);
1110 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1111 lowercase(cp);
1112 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1113 fatal("hash_host failed");
1114 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1115 ctx->has_unhashed = 1;
1116 }
1117 free(ohosts);
1118 return 0;
1119 case HKF_STATUS_INVALID:
1120 /* Retain invalid lines, but mark file as invalid. */
1121 ctx->invalid = 1;
1122 logit("%s:%lu: invalid line", l->path, l->linenum);
1123 /* FALLTHROUGH */
1124 default:
1125 fprintf(ctx->out, "%s\n", l->line);
1126 return 0;
1127 }
1128 /* NOTREACHED */
1129 return -1;
1130 }
1131
1132 static int
known_hosts_find_delete(struct hostkey_foreach_line * l,void * _ctx)1133 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1134 {
1135 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1136 enum sshkey_fp_rep rep;
1137 int fptype;
1138 char *fp;
1139
1140 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1141 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1142
1143 if (l->status == HKF_STATUS_MATCHED) {
1144 if (delete_host) {
1145 if (l->marker != MRK_NONE) {
1146 /* Don't remove CA and revocation lines */
1147 fprintf(ctx->out, "%s\n", l->line);
1148 } else {
1149 /*
1150 * Hostname matches and has no CA/revoke
1151 * marker, delete it by *not* writing the
1152 * line to ctx->out.
1153 */
1154 ctx->found_key = 1;
1155 if (!quiet)
1156 printf("# Host %s found: line %lu\n",
1157 ctx->host, l->linenum);
1158 }
1159 return 0;
1160 } else if (find_host) {
1161 ctx->found_key = 1;
1162 if (!quiet) {
1163 printf("# Host %s found: line %lu %s\n",
1164 ctx->host,
1165 l->linenum, l->marker == MRK_CA ? "CA" :
1166 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1167 }
1168 if (hash_hosts)
1169 known_hosts_hash(l, ctx);
1170 else if (print_fingerprint) {
1171 fp = sshkey_fingerprint(l->key, fptype, rep);
1172 mprintf("%s %s %s %s\n", ctx->host,
1173 sshkey_type(l->key), fp, l->comment);
1174 free(fp);
1175 } else
1176 fprintf(ctx->out, "%s\n", l->line);
1177 return 0;
1178 }
1179 } else if (delete_host) {
1180 /* Retain non-matching hosts when deleting */
1181 if (l->status == HKF_STATUS_INVALID) {
1182 ctx->invalid = 1;
1183 logit("%s:%lu: invalid line", l->path, l->linenum);
1184 }
1185 fprintf(ctx->out, "%s\n", l->line);
1186 }
1187 return 0;
1188 }
1189
1190 static void
do_known_hosts(struct passwd * pw,const char * name)1191 do_known_hosts(struct passwd *pw, const char *name)
1192 {
1193 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1194 int r, fd, oerrno, inplace = 0;
1195 struct known_hosts_ctx ctx;
1196 u_int foreach_options;
1197
1198 if (!have_identity) {
1199 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1200 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1201 sizeof(identity_file))
1202 fatal("Specified known hosts path too long");
1203 free(cp);
1204 have_identity = 1;
1205 }
1206
1207 memset(&ctx, 0, sizeof(ctx));
1208 ctx.out = stdout;
1209 ctx.host = name;
1210
1211 /*
1212 * Find hosts goes to stdout, hash and deletions happen in-place
1213 * A corner case is ssh-keygen -HF foo, which should go to stdout
1214 */
1215 if (!find_host && (hash_hosts || delete_host)) {
1216 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1217 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1218 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1219 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1220 fatal("known_hosts path too long");
1221 umask(077);
1222 if ((fd = mkstemp(tmp)) == -1)
1223 fatal("mkstemp: %s", strerror(errno));
1224 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1225 oerrno = errno;
1226 unlink(tmp);
1227 fatal("fdopen: %s", strerror(oerrno));
1228 }
1229 inplace = 1;
1230 }
1231
1232 /* XXX support identity_file == "-" for stdin */
1233 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1234 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1235 if ((r = hostkeys_foreach(identity_file,
1236 hash_hosts ? known_hosts_hash : known_hosts_find_delete, &ctx,
1237 name, NULL, foreach_options)) != 0) {
1238 if (inplace)
1239 unlink(tmp);
1240 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1241 }
1242
1243 if (inplace)
1244 fclose(ctx.out);
1245
1246 if (ctx.invalid) {
1247 error("%s is not a valid known_hosts file.", identity_file);
1248 if (inplace) {
1249 error("Not replacing existing known_hosts "
1250 "file because of errors");
1251 unlink(tmp);
1252 }
1253 exit(1);
1254 } else if (delete_host && !ctx.found_key) {
1255 logit("Host %s not found in %s", name, identity_file);
1256 if (inplace)
1257 unlink(tmp);
1258 } else if (inplace) {
1259 /* Backup existing file */
1260 if (unlink(old) == -1 && errno != ENOENT)
1261 fatal("unlink %.100s: %s", old, strerror(errno));
1262 if (link(identity_file, old) == -1)
1263 fatal("link %.100s to %.100s: %s", identity_file, old,
1264 strerror(errno));
1265 /* Move new one into place */
1266 if (rename(tmp, identity_file) == -1) {
1267 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1268 strerror(errno));
1269 unlink(tmp);
1270 unlink(old);
1271 exit(1);
1272 }
1273
1274 printf("%s updated.\n", identity_file);
1275 printf("Original contents retained as %s\n", old);
1276 if (ctx.has_unhashed) {
1277 logit("WARNING: %s contains unhashed entries", old);
1278 logit("Delete this file to ensure privacy "
1279 "of hostnames");
1280 }
1281 }
1282
1283 exit (find_host && !ctx.found_key);
1284 }
1285
1286 /*
1287 * Perform changing a passphrase. The argument is the passwd structure
1288 * for the current user.
1289 */
1290 static void
do_change_passphrase(struct passwd * pw)1291 do_change_passphrase(struct passwd *pw)
1292 {
1293 char *comment;
1294 char *old_passphrase, *passphrase1, *passphrase2;
1295 struct stat st;
1296 struct sshkey *private;
1297 int r;
1298
1299 if (!have_identity)
1300 ask_filename(pw, "Enter file in which the key is");
1301 if (stat(identity_file, &st) < 0)
1302 fatal("%s: %s", identity_file, strerror(errno));
1303 /* Try to load the file with empty passphrase. */
1304 r = sshkey_load_private(identity_file, "", &private, &comment);
1305 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1306 if (identity_passphrase)
1307 old_passphrase = xstrdup(identity_passphrase);
1308 else
1309 old_passphrase =
1310 read_passphrase("Enter old passphrase: ",
1311 RP_ALLOW_STDIN);
1312 r = sshkey_load_private(identity_file, old_passphrase,
1313 &private, &comment);
1314 explicit_bzero(old_passphrase, strlen(old_passphrase));
1315 free(old_passphrase);
1316 if (r != 0)
1317 goto badkey;
1318 } else if (r != 0) {
1319 badkey:
1320 fatal("Failed to load key %s: %s", identity_file, ssh_err(r));
1321 }
1322 if (comment)
1323 mprintf("Key has comment '%s'\n", comment);
1324
1325 /* Ask the new passphrase (twice). */
1326 if (identity_new_passphrase) {
1327 passphrase1 = xstrdup(identity_new_passphrase);
1328 passphrase2 = NULL;
1329 } else {
1330 passphrase1 =
1331 read_passphrase("Enter new passphrase (empty for no "
1332 "passphrase): ", RP_ALLOW_STDIN);
1333 passphrase2 = read_passphrase("Enter same passphrase again: ",
1334 RP_ALLOW_STDIN);
1335
1336 /* Verify that they are the same. */
1337 if (strcmp(passphrase1, passphrase2) != 0) {
1338 explicit_bzero(passphrase1, strlen(passphrase1));
1339 explicit_bzero(passphrase2, strlen(passphrase2));
1340 free(passphrase1);
1341 free(passphrase2);
1342 printf("Pass phrases do not match. Try again.\n");
1343 exit(1);
1344 }
1345 /* Destroy the other copy. */
1346 explicit_bzero(passphrase2, strlen(passphrase2));
1347 free(passphrase2);
1348 }
1349
1350 /* Save the file using the new passphrase. */
1351 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1352 comment, use_new_format, new_format_cipher, rounds)) != 0) {
1353 error("Saving key \"%s\" failed: %s.",
1354 identity_file, ssh_err(r));
1355 explicit_bzero(passphrase1, strlen(passphrase1));
1356 free(passphrase1);
1357 sshkey_free(private);
1358 free(comment);
1359 exit(1);
1360 }
1361 /* Destroy the passphrase and the copy of the key in memory. */
1362 explicit_bzero(passphrase1, strlen(passphrase1));
1363 free(passphrase1);
1364 sshkey_free(private); /* Destroys contents */
1365 free(comment);
1366
1367 printf("Your identification has been saved with the new passphrase.\n");
1368 exit(0);
1369 }
1370
1371 /*
1372 * Print the SSHFP RR.
1373 */
1374 static int
do_print_resource_record(struct passwd * pw,char * fname,char * hname)1375 do_print_resource_record(struct passwd *pw, char *fname, char *hname)
1376 {
1377 struct sshkey *public;
1378 char *comment = NULL;
1379 struct stat st;
1380 int r;
1381
1382 if (fname == NULL)
1383 fatal("%s: no filename", __func__);
1384 if (stat(fname, &st) < 0) {
1385 if (errno == ENOENT)
1386 return 0;
1387 fatal("%s: %s", fname, strerror(errno));
1388 }
1389 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1390 fatal("Failed to read v2 public key from \"%s\": %s.",
1391 fname, ssh_err(r));
1392 export_dns_rr(hname, public, stdout, print_generic);
1393 sshkey_free(public);
1394 free(comment);
1395 return 1;
1396 }
1397
1398 /*
1399 * Change the comment of a private key file.
1400 */
1401 static void
do_change_comment(struct passwd * pw)1402 do_change_comment(struct passwd *pw)
1403 {
1404 char new_comment[1024], *comment, *passphrase;
1405 struct sshkey *private;
1406 struct sshkey *public;
1407 struct stat st;
1408 FILE *f;
1409 int r, fd;
1410
1411 if (!have_identity)
1412 ask_filename(pw, "Enter file in which the key is");
1413 if (stat(identity_file, &st) < 0)
1414 fatal("%s: %s", identity_file, strerror(errno));
1415 if ((r = sshkey_load_private(identity_file, "",
1416 &private, &comment)) == 0)
1417 passphrase = xstrdup("");
1418 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1419 fatal("Cannot load private key \"%s\": %s.",
1420 identity_file, ssh_err(r));
1421 else {
1422 if (identity_passphrase)
1423 passphrase = xstrdup(identity_passphrase);
1424 else if (identity_new_passphrase)
1425 passphrase = xstrdup(identity_new_passphrase);
1426 else
1427 passphrase = read_passphrase("Enter passphrase: ",
1428 RP_ALLOW_STDIN);
1429 /* Try to load using the passphrase. */
1430 if ((r = sshkey_load_private(identity_file, passphrase,
1431 &private, &comment)) != 0) {
1432 explicit_bzero(passphrase, strlen(passphrase));
1433 free(passphrase);
1434 fatal("Cannot load private key \"%s\": %s.",
1435 identity_file, ssh_err(r));
1436 }
1437 }
1438
1439 if (private->type != KEY_RSA1 && private->type != KEY_ED25519 &&
1440 !use_new_format) {
1441 error("Comments are only supported for RSA1 or keys stored in "
1442 "the new format (-o).");
1443 explicit_bzero(passphrase, strlen(passphrase));
1444 sshkey_free(private);
1445 exit(1);
1446 }
1447 if (comment)
1448 printf("Key now has comment '%s'\n", comment);
1449 else
1450 printf("Key now has no comment\n");
1451
1452 if (identity_comment) {
1453 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1454 } else {
1455 printf("Enter new comment: ");
1456 fflush(stdout);
1457 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1458 explicit_bzero(passphrase, strlen(passphrase));
1459 sshkey_free(private);
1460 exit(1);
1461 }
1462 new_comment[strcspn(new_comment, "\n")] = '\0';
1463 }
1464
1465 /* Save the file using the new passphrase. */
1466 if ((r = sshkey_save_private(private, identity_file, passphrase,
1467 new_comment, use_new_format, new_format_cipher, rounds)) != 0) {
1468 error("Saving key \"%s\" failed: %s",
1469 identity_file, ssh_err(r));
1470 explicit_bzero(passphrase, strlen(passphrase));
1471 free(passphrase);
1472 sshkey_free(private);
1473 free(comment);
1474 exit(1);
1475 }
1476 explicit_bzero(passphrase, strlen(passphrase));
1477 free(passphrase);
1478 if ((r = sshkey_from_private(private, &public)) != 0)
1479 fatal("key_from_private failed: %s", ssh_err(r));
1480 sshkey_free(private);
1481
1482 strlcat(identity_file, ".pub", sizeof(identity_file));
1483 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1484 if (fd == -1)
1485 fatal("Could not save your public key in %s", identity_file);
1486 f = fdopen(fd, "w");
1487 if (f == NULL)
1488 fatal("fdopen %s failed: %s", identity_file, strerror(errno));
1489 if ((r = sshkey_write(public, f)) != 0)
1490 fatal("write key failed: %s", ssh_err(r));
1491 sshkey_free(public);
1492 fprintf(f, " %s\n", new_comment);
1493 fclose(f);
1494
1495 free(comment);
1496
1497 printf("The comment in your key file has been changed.\n");
1498 exit(0);
1499 }
1500
1501 static void
add_flag_option(struct sshbuf * c,const char * name)1502 add_flag_option(struct sshbuf *c, const char *name)
1503 {
1504 int r;
1505
1506 debug3("%s: %s", __func__, name);
1507 if ((r = sshbuf_put_cstring(c, name)) != 0 ||
1508 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1509 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1510 }
1511
1512 static void
add_string_option(struct sshbuf * c,const char * name,const char * value)1513 add_string_option(struct sshbuf *c, const char *name, const char *value)
1514 {
1515 struct sshbuf *b;
1516 int r;
1517
1518 debug3("%s: %s=%s", __func__, name, value);
1519 if ((b = sshbuf_new()) == NULL)
1520 fatal("%s: sshbuf_new failed", __func__);
1521 if ((r = sshbuf_put_cstring(b, value)) != 0 ||
1522 (r = sshbuf_put_cstring(c, name)) != 0 ||
1523 (r = sshbuf_put_stringb(c, b)) != 0)
1524 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1525
1526 sshbuf_free(b);
1527 }
1528
1529 #define OPTIONS_CRITICAL 1
1530 #define OPTIONS_EXTENSIONS 2
1531 static void
prepare_options_buf(struct sshbuf * c,int which)1532 prepare_options_buf(struct sshbuf *c, int which)
1533 {
1534 sshbuf_reset(c);
1535 if ((which & OPTIONS_CRITICAL) != 0 &&
1536 certflags_command != NULL)
1537 add_string_option(c, "force-command", certflags_command);
1538 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1539 (certflags_flags & CERTOPT_X_FWD) != 0)
1540 add_flag_option(c, "permit-X11-forwarding");
1541 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1542 (certflags_flags & CERTOPT_AGENT_FWD) != 0)
1543 add_flag_option(c, "permit-agent-forwarding");
1544 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1545 (certflags_flags & CERTOPT_PORT_FWD) != 0)
1546 add_flag_option(c, "permit-port-forwarding");
1547 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1548 (certflags_flags & CERTOPT_PTY) != 0)
1549 add_flag_option(c, "permit-pty");
1550 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1551 (certflags_flags & CERTOPT_USER_RC) != 0)
1552 add_flag_option(c, "permit-user-rc");
1553 if ((which & OPTIONS_CRITICAL) != 0 &&
1554 certflags_src_addr != NULL)
1555 add_string_option(c, "source-address", certflags_src_addr);
1556 }
1557
1558 static struct sshkey *
load_pkcs11_key(char * path)1559 load_pkcs11_key(char *path)
1560 {
1561 #ifdef ENABLE_PKCS11
1562 struct sshkey **keys = NULL, *public, *private = NULL;
1563 int r, i, nkeys;
1564
1565 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1566 fatal("Couldn't load CA public key \"%s\": %s",
1567 path, ssh_err(r));
1568
1569 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys);
1570 debug3("%s: %d keys", __func__, nkeys);
1571 if (nkeys <= 0)
1572 fatal("cannot read public key from pkcs11");
1573 for (i = 0; i < nkeys; i++) {
1574 if (sshkey_equal_public(public, keys[i])) {
1575 private = keys[i];
1576 continue;
1577 }
1578 sshkey_free(keys[i]);
1579 }
1580 free(keys);
1581 sshkey_free(public);
1582 return private;
1583 #else
1584 fatal("no pkcs11 support");
1585 #endif /* ENABLE_PKCS11 */
1586 }
1587
1588 static void
do_ca_sign(struct passwd * pw,int argc,char ** argv)1589 do_ca_sign(struct passwd *pw, int argc, char **argv)
1590 {
1591 int r, i, fd;
1592 u_int n;
1593 struct sshkey *ca, *public;
1594 char valid[64], *otmp, *tmp, *cp, *out, *comment, **plist = NULL;
1595 FILE *f;
1596
1597 #ifdef ENABLE_PKCS11
1598 pkcs11_init(1);
1599 #endif
1600 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1601 if (pkcs11provider != NULL) {
1602 if ((ca = load_pkcs11_key(tmp)) == NULL)
1603 fatal("No PKCS#11 key matching %s found", ca_key_path);
1604 } else
1605 ca = load_identity(tmp);
1606 free(tmp);
1607
1608 if (key_type_name != NULL &&
1609 sshkey_type_from_name(key_type_name) != ca->type) {
1610 fatal("CA key type %s doesn't match specified %s",
1611 sshkey_ssh_name(ca), key_type_name);
1612 }
1613
1614 for (i = 0; i < argc; i++) {
1615 /* Split list of principals */
1616 n = 0;
1617 if (cert_principals != NULL) {
1618 otmp = tmp = xstrdup(cert_principals);
1619 plist = NULL;
1620 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1621 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1622 if (*(plist[n] = xstrdup(cp)) == '\0')
1623 fatal("Empty principal name");
1624 }
1625 free(otmp);
1626 }
1627
1628 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1629 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1630 fatal("%s: unable to open \"%s\": %s",
1631 __func__, tmp, ssh_err(r));
1632 if (public->type != KEY_RSA && public->type != KEY_DSA &&
1633 public->type != KEY_ECDSA && public->type != KEY_ED25519)
1634 fatal("%s: key \"%s\" type %s cannot be certified",
1635 __func__, tmp, sshkey_type(public));
1636
1637 /* Prepare certificate to sign */
1638 if ((r = sshkey_to_certified(public)) != 0)
1639 fatal("Could not upgrade key %s to certificate: %s",
1640 tmp, ssh_err(r));
1641 public->cert->type = cert_key_type;
1642 public->cert->serial = (u_int64_t)cert_serial;
1643 public->cert->key_id = xstrdup(cert_key_id);
1644 public->cert->nprincipals = n;
1645 public->cert->principals = plist;
1646 public->cert->valid_after = cert_valid_from;
1647 public->cert->valid_before = cert_valid_to;
1648 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1649 prepare_options_buf(public->cert->extensions,
1650 OPTIONS_EXTENSIONS);
1651 if ((r = sshkey_from_private(ca,
1652 &public->cert->signature_key)) != 0)
1653 fatal("key_from_private (ca key): %s", ssh_err(r));
1654
1655 if ((r = sshkey_certify(public, ca, key_type_name)) != 0)
1656 fatal("Couldn't certify key %s: %s", tmp, ssh_err(r));
1657
1658 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1659 *cp = '\0';
1660 xasprintf(&out, "%s-cert.pub", tmp);
1661 free(tmp);
1662
1663 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
1664 fatal("Could not open \"%s\" for writing: %s", out,
1665 strerror(errno));
1666 if ((f = fdopen(fd, "w")) == NULL)
1667 fatal("%s: fdopen: %s", __func__, strerror(errno));
1668 if ((r = sshkey_write(public, f)) != 0)
1669 fatal("Could not write certified key to %s: %s",
1670 out, ssh_err(r));
1671 fprintf(f, " %s\n", comment);
1672 fclose(f);
1673
1674 if (!quiet) {
1675 sshkey_format_cert_validity(public->cert,
1676 valid, sizeof(valid));
1677 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1678 "valid %s", sshkey_cert_type(public),
1679 out, public->cert->key_id,
1680 (unsigned long long)public->cert->serial,
1681 cert_principals != NULL ? " for " : "",
1682 cert_principals != NULL ? cert_principals : "",
1683 valid);
1684 }
1685
1686 sshkey_free(public);
1687 free(out);
1688 }
1689 #ifdef ENABLE_PKCS11
1690 pkcs11_terminate();
1691 #endif
1692 exit(0);
1693 }
1694
1695 static u_int64_t
parse_relative_time(const char * s,time_t now)1696 parse_relative_time(const char *s, time_t now)
1697 {
1698 int64_t mul, secs;
1699
1700 mul = *s == '-' ? -1 : 1;
1701
1702 if ((secs = convtime(s + 1)) == -1)
1703 fatal("Invalid relative certificate time %s", s);
1704 if (mul == -1 && secs > now)
1705 fatal("Certificate time %s cannot be represented", s);
1706 return now + (u_int64_t)(secs * mul);
1707 }
1708
1709 static u_int64_t
parse_absolute_time(const char * s)1710 parse_absolute_time(const char *s)
1711 {
1712 struct tm tm;
1713 time_t tt;
1714 char buf[32], *fmt;
1715
1716 /*
1717 * POSIX strptime says "The application shall ensure that there
1718 * is white-space or other non-alphanumeric characters between
1719 * any two conversion specifications" so arrange things this way.
1720 */
1721 switch (strlen(s)) {
1722 case 8:
1723 fmt = "%Y-%m-%d";
1724 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
1725 break;
1726 case 14:
1727 fmt = "%Y-%m-%dT%H:%M:%S";
1728 snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
1729 s, s + 4, s + 6, s + 8, s + 10, s + 12);
1730 break;
1731 default:
1732 fatal("Invalid certificate time format %s", s);
1733 }
1734
1735 memset(&tm, 0, sizeof(tm));
1736 if (strptime(buf, fmt, &tm) == NULL)
1737 fatal("Invalid certificate time %s", s);
1738 if ((tt = mktime(&tm)) < 0)
1739 fatal("Certificate time %s cannot be represented", s);
1740 return (u_int64_t)tt;
1741 }
1742
1743 static void
parse_cert_times(char * timespec)1744 parse_cert_times(char *timespec)
1745 {
1746 char *from, *to;
1747 time_t now = time(NULL);
1748 int64_t secs;
1749
1750 /* +timespec relative to now */
1751 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1752 if ((secs = convtime(timespec + 1)) == -1)
1753 fatal("Invalid relative certificate life %s", timespec);
1754 cert_valid_to = now + secs;
1755 /*
1756 * Backdate certificate one minute to avoid problems on hosts
1757 * with poorly-synchronised clocks.
1758 */
1759 cert_valid_from = ((now - 59)/ 60) * 60;
1760 return;
1761 }
1762
1763 /*
1764 * from:to, where
1765 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1766 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS
1767 */
1768 from = xstrdup(timespec);
1769 to = strchr(from, ':');
1770 if (to == NULL || from == to || *(to + 1) == '\0')
1771 fatal("Invalid certificate life specification %s", timespec);
1772 *to++ = '\0';
1773
1774 if (*from == '-' || *from == '+')
1775 cert_valid_from = parse_relative_time(from, now);
1776 else
1777 cert_valid_from = parse_absolute_time(from);
1778
1779 if (*to == '-' || *to == '+')
1780 cert_valid_to = parse_relative_time(to, now);
1781 else
1782 cert_valid_to = parse_absolute_time(to);
1783
1784 if (cert_valid_to <= cert_valid_from)
1785 fatal("Empty certificate validity interval");
1786 free(from);
1787 }
1788
1789 static void
add_cert_option(char * opt)1790 add_cert_option(char *opt)
1791 {
1792 char *val;
1793
1794 if (strcasecmp(opt, "clear") == 0)
1795 certflags_flags = 0;
1796 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1797 certflags_flags &= ~CERTOPT_X_FWD;
1798 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1799 certflags_flags |= CERTOPT_X_FWD;
1800 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
1801 certflags_flags &= ~CERTOPT_AGENT_FWD;
1802 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
1803 certflags_flags |= CERTOPT_AGENT_FWD;
1804 else if (strcasecmp(opt, "no-port-forwarding") == 0)
1805 certflags_flags &= ~CERTOPT_PORT_FWD;
1806 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
1807 certflags_flags |= CERTOPT_PORT_FWD;
1808 else if (strcasecmp(opt, "no-pty") == 0)
1809 certflags_flags &= ~CERTOPT_PTY;
1810 else if (strcasecmp(opt, "permit-pty") == 0)
1811 certflags_flags |= CERTOPT_PTY;
1812 else if (strcasecmp(opt, "no-user-rc") == 0)
1813 certflags_flags &= ~CERTOPT_USER_RC;
1814 else if (strcasecmp(opt, "permit-user-rc") == 0)
1815 certflags_flags |= CERTOPT_USER_RC;
1816 else if (strncasecmp(opt, "force-command=", 14) == 0) {
1817 val = opt + 14;
1818 if (*val == '\0')
1819 fatal("Empty force-command option");
1820 if (certflags_command != NULL)
1821 fatal("force-command already specified");
1822 certflags_command = xstrdup(val);
1823 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
1824 val = opt + 15;
1825 if (*val == '\0')
1826 fatal("Empty source-address option");
1827 if (certflags_src_addr != NULL)
1828 fatal("source-address already specified");
1829 if (addr_match_cidr_list(NULL, val) != 0)
1830 fatal("Invalid source-address list");
1831 certflags_src_addr = xstrdup(val);
1832 } else
1833 fatal("Unsupported certificate option \"%s\"", opt);
1834 }
1835
1836 static void
show_options(struct sshbuf * optbuf,int in_critical)1837 show_options(struct sshbuf *optbuf, int in_critical)
1838 {
1839 char *name, *arg;
1840 struct sshbuf *options, *option = NULL;
1841 int r;
1842
1843 if ((options = sshbuf_fromb(optbuf)) == NULL)
1844 fatal("%s: sshbuf_fromb failed", __func__);
1845 while (sshbuf_len(options) != 0) {
1846 sshbuf_free(option);
1847 option = NULL;
1848 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
1849 (r = sshbuf_froms(options, &option)) != 0)
1850 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1851 printf(" %s", name);
1852 if (!in_critical &&
1853 (strcmp(name, "permit-X11-forwarding") == 0 ||
1854 strcmp(name, "permit-agent-forwarding") == 0 ||
1855 strcmp(name, "permit-port-forwarding") == 0 ||
1856 strcmp(name, "permit-pty") == 0 ||
1857 strcmp(name, "permit-user-rc") == 0))
1858 printf("\n");
1859 else if (in_critical &&
1860 (strcmp(name, "force-command") == 0 ||
1861 strcmp(name, "source-address") == 0)) {
1862 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
1863 fatal("%s: buffer error: %s",
1864 __func__, ssh_err(r));
1865 printf(" %s\n", arg);
1866 free(arg);
1867 } else {
1868 printf(" UNKNOWN OPTION (len %zu)\n",
1869 sshbuf_len(option));
1870 sshbuf_reset(option);
1871 }
1872 free(name);
1873 if (sshbuf_len(option) != 0)
1874 fatal("Option corrupt: extra data at end");
1875 }
1876 sshbuf_free(option);
1877 sshbuf_free(options);
1878 }
1879
1880 static void
print_cert(struct sshkey * key)1881 print_cert(struct sshkey *key)
1882 {
1883 char valid[64], *key_fp, *ca_fp;
1884 u_int i;
1885
1886 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
1887 ca_fp = sshkey_fingerprint(key->cert->signature_key,
1888 fingerprint_hash, SSH_FP_DEFAULT);
1889 if (key_fp == NULL || ca_fp == NULL)
1890 fatal("%s: sshkey_fingerprint fail", __func__);
1891 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
1892
1893 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
1894 sshkey_cert_type(key));
1895 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
1896 printf(" Signing CA: %s %s\n",
1897 sshkey_type(key->cert->signature_key), ca_fp);
1898 printf(" Key ID: \"%s\"\n", key->cert->key_id);
1899 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
1900 printf(" Valid: %s\n", valid);
1901 printf(" Principals: ");
1902 if (key->cert->nprincipals == 0)
1903 printf("(none)\n");
1904 else {
1905 for (i = 0; i < key->cert->nprincipals; i++)
1906 printf("\n %s",
1907 key->cert->principals[i]);
1908 printf("\n");
1909 }
1910 printf(" Critical Options: ");
1911 if (sshbuf_len(key->cert->critical) == 0)
1912 printf("(none)\n");
1913 else {
1914 printf("\n");
1915 show_options(key->cert->critical, 1);
1916 }
1917 printf(" Extensions: ");
1918 if (sshbuf_len(key->cert->extensions) == 0)
1919 printf("(none)\n");
1920 else {
1921 printf("\n");
1922 show_options(key->cert->extensions, 0);
1923 }
1924 }
1925
1926 static void
do_show_cert(struct passwd * pw)1927 do_show_cert(struct passwd *pw)
1928 {
1929 struct sshkey *key = NULL;
1930 struct stat st;
1931 int r, is_stdin = 0, ok = 0;
1932 FILE *f;
1933 char *cp, line[SSH_MAX_PUBKEY_BYTES];
1934 const char *path;
1935 u_long lnum = 0;
1936
1937 if (!have_identity)
1938 ask_filename(pw, "Enter file in which the key is");
1939 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) < 0)
1940 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
1941
1942 path = identity_file;
1943 if (strcmp(path, "-") == 0) {
1944 f = stdin;
1945 path = "(stdin)";
1946 is_stdin = 1;
1947 } else if ((f = fopen(identity_file, "r")) == NULL)
1948 fatal("fopen %s: %s", identity_file, strerror(errno));
1949
1950 while (read_keyfile_line(f, path, line, sizeof(line), &lnum) == 0) {
1951 sshkey_free(key);
1952 key = NULL;
1953 /* Trim leading space and comments */
1954 cp = line + strspn(line, " \t");
1955 if (*cp == '#' || *cp == '\0')
1956 continue;
1957 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
1958 fatal("key_new");
1959 if ((r = sshkey_read(key, &cp)) != 0) {
1960 error("%s:%lu: invalid key: %s", path,
1961 lnum, ssh_err(r));
1962 continue;
1963 }
1964 if (!sshkey_is_cert(key)) {
1965 error("%s:%lu is not a certificate", path, lnum);
1966 continue;
1967 }
1968 ok = 1;
1969 if (!is_stdin && lnum == 1)
1970 printf("%s:\n", path);
1971 else
1972 printf("%s:%lu:\n", path, lnum);
1973 print_cert(key);
1974 }
1975 sshkey_free(key);
1976 fclose(f);
1977 exit(ok ? 0 : 1);
1978 }
1979
1980 static void
load_krl(const char * path,struct ssh_krl ** krlp)1981 load_krl(const char *path, struct ssh_krl **krlp)
1982 {
1983 struct sshbuf *krlbuf;
1984 int r, fd;
1985
1986 if ((krlbuf = sshbuf_new()) == NULL)
1987 fatal("sshbuf_new failed");
1988 if ((fd = open(path, O_RDONLY)) == -1)
1989 fatal("open %s: %s", path, strerror(errno));
1990 if ((r = sshkey_load_file(fd, krlbuf)) != 0)
1991 fatal("Unable to load KRL: %s", ssh_err(r));
1992 close(fd);
1993 /* XXX check sigs */
1994 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 ||
1995 *krlp == NULL)
1996 fatal("Invalid KRL file: %s", ssh_err(r));
1997 sshbuf_free(krlbuf);
1998 }
1999
2000 static void
update_krl_from_file(struct passwd * pw,const char * file,int wild_ca,const struct sshkey * ca,struct ssh_krl * krl)2001 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2002 const struct sshkey *ca, struct ssh_krl *krl)
2003 {
2004 struct sshkey *key = NULL;
2005 u_long lnum = 0;
2006 char *path, *cp, *ep, line[SSH_MAX_PUBKEY_BYTES];
2007 unsigned long long serial, serial2;
2008 int i, was_explicit_key, was_sha1, r;
2009 FILE *krl_spec;
2010
2011 path = tilde_expand_filename(file, pw->pw_uid);
2012 if (strcmp(path, "-") == 0) {
2013 krl_spec = stdin;
2014 free(path);
2015 path = xstrdup("(standard input)");
2016 } else if ((krl_spec = fopen(path, "r")) == NULL)
2017 fatal("fopen %s: %s", path, strerror(errno));
2018
2019 if (!quiet)
2020 printf("Revoking from %s\n", path);
2021 while (read_keyfile_line(krl_spec, path, line, sizeof(line),
2022 &lnum) == 0) {
2023 was_explicit_key = was_sha1 = 0;
2024 cp = line + strspn(line, " \t");
2025 /* Trim trailing space, comments and strip \n */
2026 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2027 if (cp[i] == '#' || cp[i] == '\n') {
2028 cp[i] = '\0';
2029 break;
2030 }
2031 if (cp[i] == ' ' || cp[i] == '\t') {
2032 /* Remember the start of a span of whitespace */
2033 if (r == -1)
2034 r = i;
2035 } else
2036 r = -1;
2037 }
2038 if (r != -1)
2039 cp[r] = '\0';
2040 if (*cp == '\0')
2041 continue;
2042 if (strncasecmp(cp, "serial:", 7) == 0) {
2043 if (ca == NULL && !wild_ca) {
2044 fatal("revoking certificates by serial number "
2045 "requires specification of a CA key");
2046 }
2047 cp += 7;
2048 cp = cp + strspn(cp, " \t");
2049 errno = 0;
2050 serial = strtoull(cp, &ep, 0);
2051 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2052 fatal("%s:%lu: invalid serial \"%s\"",
2053 path, lnum, cp);
2054 if (errno == ERANGE && serial == ULLONG_MAX)
2055 fatal("%s:%lu: serial out of range",
2056 path, lnum);
2057 serial2 = serial;
2058 if (*ep == '-') {
2059 cp = ep + 1;
2060 errno = 0;
2061 serial2 = strtoull(cp, &ep, 0);
2062 if (*cp == '\0' || *ep != '\0')
2063 fatal("%s:%lu: invalid serial \"%s\"",
2064 path, lnum, cp);
2065 if (errno == ERANGE && serial2 == ULLONG_MAX)
2066 fatal("%s:%lu: serial out of range",
2067 path, lnum);
2068 if (serial2 <= serial)
2069 fatal("%s:%lu: invalid serial range "
2070 "%llu:%llu", path, lnum,
2071 (unsigned long long)serial,
2072 (unsigned long long)serial2);
2073 }
2074 if (ssh_krl_revoke_cert_by_serial_range(krl,
2075 ca, serial, serial2) != 0) {
2076 fatal("%s: revoke serial failed",
2077 __func__);
2078 }
2079 } else if (strncasecmp(cp, "id:", 3) == 0) {
2080 if (ca == NULL && !wild_ca) {
2081 fatal("revoking certificates by key ID "
2082 "requires specification of a CA key");
2083 }
2084 cp += 3;
2085 cp = cp + strspn(cp, " \t");
2086 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2087 fatal("%s: revoke key ID failed", __func__);
2088 } else {
2089 if (strncasecmp(cp, "key:", 4) == 0) {
2090 cp += 4;
2091 cp = cp + strspn(cp, " \t");
2092 was_explicit_key = 1;
2093 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2094 cp += 5;
2095 cp = cp + strspn(cp, " \t");
2096 was_sha1 = 1;
2097 } else {
2098 /*
2099 * Just try to process the line as a key.
2100 * Parsing will fail if it isn't.
2101 */
2102 }
2103 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2104 fatal("key_new");
2105 if ((r = sshkey_read(key, &cp)) != 0)
2106 fatal("%s:%lu: invalid key: %s",
2107 path, lnum, ssh_err(r));
2108 if (was_explicit_key)
2109 r = ssh_krl_revoke_key_explicit(krl, key);
2110 else if (was_sha1)
2111 r = ssh_krl_revoke_key_sha1(krl, key);
2112 else
2113 r = ssh_krl_revoke_key(krl, key);
2114 if (r != 0)
2115 fatal("%s: revoke key failed: %s",
2116 __func__, ssh_err(r));
2117 sshkey_free(key);
2118 }
2119 }
2120 if (strcmp(path, "-") != 0)
2121 fclose(krl_spec);
2122 free(path);
2123 }
2124
2125 static void
do_gen_krl(struct passwd * pw,int updating,int argc,char ** argv)2126 do_gen_krl(struct passwd *pw, int updating, int argc, char **argv)
2127 {
2128 struct ssh_krl *krl;
2129 struct stat sb;
2130 struct sshkey *ca = NULL;
2131 int fd, i, r, wild_ca = 0;
2132 char *tmp;
2133 struct sshbuf *kbuf;
2134
2135 if (*identity_file == '\0')
2136 fatal("KRL generation requires an output file");
2137 if (stat(identity_file, &sb) == -1) {
2138 if (errno != ENOENT)
2139 fatal("Cannot access KRL \"%s\": %s",
2140 identity_file, strerror(errno));
2141 if (updating)
2142 fatal("KRL \"%s\" does not exist", identity_file);
2143 }
2144 if (ca_key_path != NULL) {
2145 if (strcasecmp(ca_key_path, "none") == 0)
2146 wild_ca = 1;
2147 else {
2148 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2149 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2150 fatal("Cannot load CA public key %s: %s",
2151 tmp, ssh_err(r));
2152 free(tmp);
2153 }
2154 }
2155
2156 if (updating)
2157 load_krl(identity_file, &krl);
2158 else if ((krl = ssh_krl_init()) == NULL)
2159 fatal("couldn't create KRL");
2160
2161 if (cert_serial != 0)
2162 ssh_krl_set_version(krl, cert_serial);
2163 if (identity_comment != NULL)
2164 ssh_krl_set_comment(krl, identity_comment);
2165
2166 for (i = 0; i < argc; i++)
2167 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2168
2169 if ((kbuf = sshbuf_new()) == NULL)
2170 fatal("sshbuf_new failed");
2171 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0)
2172 fatal("Couldn't generate KRL");
2173 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
2174 fatal("open %s: %s", identity_file, strerror(errno));
2175 if (atomicio(vwrite, fd, (void *)sshbuf_ptr(kbuf), sshbuf_len(kbuf)) !=
2176 sshbuf_len(kbuf))
2177 fatal("write %s: %s", identity_file, strerror(errno));
2178 close(fd);
2179 sshbuf_free(kbuf);
2180 ssh_krl_free(krl);
2181 sshkey_free(ca);
2182 }
2183
2184 static void
do_check_krl(struct passwd * pw,int argc,char ** argv)2185 do_check_krl(struct passwd *pw, int argc, char **argv)
2186 {
2187 int i, r, ret = 0;
2188 char *comment;
2189 struct ssh_krl *krl;
2190 struct sshkey *k;
2191
2192 if (*identity_file == '\0')
2193 fatal("KRL checking requires an input file");
2194 load_krl(identity_file, &krl);
2195 for (i = 0; i < argc; i++) {
2196 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2197 fatal("Cannot load public key %s: %s",
2198 argv[i], ssh_err(r));
2199 r = ssh_krl_check_key(krl, k);
2200 printf("%s%s%s%s: %s\n", argv[i],
2201 *comment ? " (" : "", comment, *comment ? ")" : "",
2202 r == 0 ? "ok" : "REVOKED");
2203 if (r != 0)
2204 ret = 1;
2205 sshkey_free(k);
2206 free(comment);
2207 }
2208 ssh_krl_free(krl);
2209 exit(ret);
2210 }
2211
2212 #ifdef WITH_SSH1
2213 # define RSA1_USAGE " | rsa1"
2214 #else
2215 # define RSA1_USAGE ""
2216 #endif
2217
2218 static void
usage(void)2219 usage(void)
2220 {
2221 fprintf(stderr,
2222 "usage: ssh-keygen [-q] [-b bits] [-t dsa | ecdsa | ed25519 | rsa%s]\n"
2223 " [-N new_passphrase] [-C comment] [-f output_keyfile]\n"
2224 " ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]\n"
2225 " ssh-keygen -i [-m key_format] [-f input_keyfile]\n"
2226 " ssh-keygen -e [-m key_format] [-f input_keyfile]\n"
2227 " ssh-keygen -y [-f input_keyfile]\n"
2228 " ssh-keygen -c [-P passphrase] [-C comment] [-f keyfile]\n"
2229 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
2230 " ssh-keygen -B [-f input_keyfile]\n", RSA1_USAGE);
2231 #ifdef ENABLE_PKCS11
2232 fprintf(stderr,
2233 " ssh-keygen -D pkcs11\n");
2234 #endif
2235 fprintf(stderr,
2236 " ssh-keygen -F hostname [-f known_hosts_file] [-l]\n"
2237 " ssh-keygen -H [-f known_hosts_file]\n"
2238 " ssh-keygen -R hostname [-f known_hosts_file]\n"
2239 " ssh-keygen -r hostname [-f input_keyfile] [-g]\n"
2240 #ifdef WITH_OPENSSL
2241 " ssh-keygen -G output_file [-v] [-b bits] [-M memory] [-S start_point]\n"
2242 " ssh-keygen -T output_file -f input_file [-v] [-a rounds] [-J num_lines]\n"
2243 " [-j start_line] [-K checkpt] [-W generator]\n"
2244 #endif
2245 " ssh-keygen -s ca_key -I certificate_identity [-h] [-n principals]\n"
2246 " [-O option] [-V validity_interval] [-z serial_number] file ...\n"
2247 " ssh-keygen -L [-f input_keyfile]\n"
2248 " ssh-keygen -A\n"
2249 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
2250 " file ...\n"
2251 " ssh-keygen -Q -f krl_file file ...\n");
2252 exit(1);
2253 }
2254
2255 /*
2256 * Main program for key management.
2257 */
2258 int
main(int argc,char ** argv)2259 main(int argc, char **argv)
2260 {
2261 char dotsshdir[PATH_MAX], comment[1024], *passphrase1, *passphrase2;
2262 char *rr_hostname = NULL, *ep, *fp, *ra;
2263 struct sshkey *private, *public;
2264 struct passwd *pw;
2265 struct stat st;
2266 int r, opt, type, fd;
2267 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
2268 FILE *f;
2269 const char *errstr;
2270 #ifdef WITH_OPENSSL
2271 /* Moduli generation/screening */
2272 char out_file[PATH_MAX], *checkpoint = NULL;
2273 u_int32_t memory = 0, generator_wanted = 0;
2274 int do_gen_candidates = 0, do_screen_candidates = 0;
2275 unsigned long start_lineno = 0, lines_to_process = 0;
2276 BIGNUM *start = NULL;
2277 #endif
2278
2279 extern int optind;
2280 extern char *optarg;
2281
2282 ssh_malloc_init(); /* must be called before any mallocs */
2283 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
2284 sanitise_stdfd();
2285
2286 __progname = ssh_get_progname(argv[0]);
2287
2288 #ifdef WITH_OPENSSL
2289 OpenSSL_add_all_algorithms();
2290 #endif
2291 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
2292
2293 seed_rng();
2294
2295 msetlocale();
2296
2297 /* we need this for the home * directory. */
2298 pw = getpwuid(getuid());
2299 if (!pw)
2300 fatal("No user exists for uid %lu", (u_long)getuid());
2301 if (gethostname(hostname, sizeof(hostname)) < 0)
2302 fatal("gethostname: %s", strerror(errno));
2303
2304 /* Remaining characters: UYdw */
2305 while ((opt = getopt(argc, argv, "ABHLQXceghiklopquvxy"
2306 "C:D:E:F:G:I:J:K:M:N:O:P:R:S:T:V:W:Z:"
2307 "a:b:f:g:j:m:n:r:s:t:z:")) != -1) {
2308 switch (opt) {
2309 case 'A':
2310 gen_all_hostkeys = 1;
2311 break;
2312 case 'b':
2313 bits = (u_int32_t)strtonum(optarg, 256, 32768, &errstr);
2314 if (errstr)
2315 fatal("Bits has bad value %s (%s)",
2316 optarg, errstr);
2317 break;
2318 case 'E':
2319 fingerprint_hash = ssh_digest_alg_by_name(optarg);
2320 if (fingerprint_hash == -1)
2321 fatal("Invalid hash algorithm \"%s\"", optarg);
2322 break;
2323 case 'F':
2324 find_host = 1;
2325 rr_hostname = optarg;
2326 break;
2327 case 'H':
2328 hash_hosts = 1;
2329 break;
2330 case 'I':
2331 cert_key_id = optarg;
2332 break;
2333 case 'R':
2334 delete_host = 1;
2335 rr_hostname = optarg;
2336 break;
2337 case 'L':
2338 show_cert = 1;
2339 break;
2340 case 'l':
2341 print_fingerprint = 1;
2342 break;
2343 case 'B':
2344 print_bubblebabble = 1;
2345 break;
2346 case 'm':
2347 if (strcasecmp(optarg, "RFC4716") == 0 ||
2348 strcasecmp(optarg, "ssh2") == 0) {
2349 convert_format = FMT_RFC4716;
2350 break;
2351 }
2352 if (strcasecmp(optarg, "PKCS8") == 0) {
2353 convert_format = FMT_PKCS8;
2354 break;
2355 }
2356 if (strcasecmp(optarg, "PEM") == 0) {
2357 convert_format = FMT_PEM;
2358 break;
2359 }
2360 fatal("Unsupported conversion format \"%s\"", optarg);
2361 case 'n':
2362 cert_principals = optarg;
2363 break;
2364 case 'o':
2365 use_new_format = 1;
2366 break;
2367 case 'p':
2368 change_passphrase = 1;
2369 break;
2370 case 'c':
2371 change_comment = 1;
2372 break;
2373 case 'f':
2374 if (strlcpy(identity_file, optarg,
2375 sizeof(identity_file)) >= sizeof(identity_file))
2376 fatal("Identity filename too long");
2377 have_identity = 1;
2378 break;
2379 case 'g':
2380 print_generic = 1;
2381 break;
2382 case 'P':
2383 identity_passphrase = optarg;
2384 break;
2385 case 'N':
2386 identity_new_passphrase = optarg;
2387 break;
2388 case 'Q':
2389 check_krl = 1;
2390 break;
2391 case 'O':
2392 add_cert_option(optarg);
2393 break;
2394 case 'Z':
2395 new_format_cipher = optarg;
2396 break;
2397 case 'C':
2398 identity_comment = optarg;
2399 break;
2400 case 'q':
2401 quiet = 1;
2402 break;
2403 case 'e':
2404 case 'x':
2405 /* export key */
2406 convert_to = 1;
2407 break;
2408 case 'h':
2409 cert_key_type = SSH2_CERT_TYPE_HOST;
2410 certflags_flags = 0;
2411 break;
2412 case 'k':
2413 gen_krl = 1;
2414 break;
2415 case 'i':
2416 case 'X':
2417 /* import key */
2418 convert_from = 1;
2419 break;
2420 case 'y':
2421 print_public = 1;
2422 break;
2423 case 's':
2424 ca_key_path = optarg;
2425 break;
2426 case 't':
2427 key_type_name = optarg;
2428 break;
2429 case 'D':
2430 pkcs11provider = optarg;
2431 break;
2432 case 'u':
2433 update_krl = 1;
2434 break;
2435 case 'v':
2436 if (log_level == SYSLOG_LEVEL_INFO)
2437 log_level = SYSLOG_LEVEL_DEBUG1;
2438 else {
2439 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
2440 log_level < SYSLOG_LEVEL_DEBUG3)
2441 log_level++;
2442 }
2443 break;
2444 case 'r':
2445 rr_hostname = optarg;
2446 break;
2447 case 'a':
2448 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
2449 if (errstr)
2450 fatal("Invalid number: %s (%s)",
2451 optarg, errstr);
2452 break;
2453 case 'V':
2454 parse_cert_times(optarg);
2455 break;
2456 case 'z':
2457 errno = 0;
2458 cert_serial = strtoull(optarg, &ep, 10);
2459 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
2460 (errno == ERANGE && cert_serial == ULLONG_MAX))
2461 fatal("Invalid serial number \"%s\"", optarg);
2462 break;
2463 #ifdef WITH_OPENSSL
2464 /* Moduli generation/screening */
2465 case 'G':
2466 do_gen_candidates = 1;
2467 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
2468 sizeof(out_file))
2469 fatal("Output filename too long");
2470 break;
2471 case 'J':
2472 lines_to_process = strtoul(optarg, NULL, 10);
2473 break;
2474 case 'j':
2475 start_lineno = strtoul(optarg, NULL, 10);
2476 break;
2477 case 'K':
2478 if (strlen(optarg) >= PATH_MAX)
2479 fatal("Checkpoint filename too long");
2480 checkpoint = xstrdup(optarg);
2481 break;
2482 case 'M':
2483 memory = (u_int32_t)strtonum(optarg, 1, UINT_MAX,
2484 &errstr);
2485 if (errstr)
2486 fatal("Memory limit is %s: %s", errstr, optarg);
2487 break;
2488 case 'S':
2489 /* XXX - also compare length against bits */
2490 if (BN_hex2bn(&start, optarg) == 0)
2491 fatal("Invalid start point.");
2492 break;
2493 case 'T':
2494 do_screen_candidates = 1;
2495 if (strlcpy(out_file, optarg, sizeof(out_file)) >=
2496 sizeof(out_file))
2497 fatal("Output filename too long");
2498 break;
2499 case 'W':
2500 generator_wanted = (u_int32_t)strtonum(optarg, 1,
2501 UINT_MAX, &errstr);
2502 if (errstr != NULL)
2503 fatal("Desired generator invalid: %s (%s)",
2504 optarg, errstr);
2505 break;
2506 #endif /* WITH_OPENSSL */
2507 case '?':
2508 default:
2509 usage();
2510 }
2511 }
2512
2513 /* reinit */
2514 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
2515
2516 argv += optind;
2517 argc -= optind;
2518
2519 if (ca_key_path != NULL) {
2520 if (argc < 1 && !gen_krl) {
2521 error("Too few arguments.");
2522 usage();
2523 }
2524 } else if (argc > 0 && !gen_krl && !check_krl) {
2525 error("Too many arguments.");
2526 usage();
2527 }
2528 if (change_passphrase && change_comment) {
2529 error("Can only have one of -p and -c.");
2530 usage();
2531 }
2532 if (print_fingerprint && (delete_host || hash_hosts)) {
2533 error("Cannot use -l with -H or -R.");
2534 usage();
2535 }
2536 if (gen_krl) {
2537 do_gen_krl(pw, update_krl, argc, argv);
2538 return (0);
2539 }
2540 if (check_krl) {
2541 do_check_krl(pw, argc, argv);
2542 return (0);
2543 }
2544 if (ca_key_path != NULL) {
2545 if (cert_key_id == NULL)
2546 fatal("Must specify key id (-I) when certifying");
2547 do_ca_sign(pw, argc, argv);
2548 }
2549 if (show_cert)
2550 do_show_cert(pw);
2551 if (delete_host || hash_hosts || find_host)
2552 do_known_hosts(pw, rr_hostname);
2553 if (pkcs11provider != NULL)
2554 do_download(pw);
2555 if (print_fingerprint || print_bubblebabble)
2556 do_fingerprint(pw);
2557 if (change_passphrase)
2558 do_change_passphrase(pw);
2559 if (change_comment)
2560 do_change_comment(pw);
2561 #ifdef WITH_OPENSSL
2562 if (convert_to)
2563 do_convert_to(pw);
2564 if (convert_from)
2565 do_convert_from(pw);
2566 #endif
2567 if (print_public)
2568 do_print_public(pw);
2569 if (rr_hostname != NULL) {
2570 unsigned int n = 0;
2571
2572 if (have_identity) {
2573 n = do_print_resource_record(pw,
2574 identity_file, rr_hostname);
2575 if (n == 0)
2576 fatal("%s: %s", identity_file, strerror(errno));
2577 exit(0);
2578 } else {
2579
2580 n += do_print_resource_record(pw,
2581 _PATH_HOST_RSA_KEY_FILE, rr_hostname);
2582 n += do_print_resource_record(pw,
2583 _PATH_HOST_DSA_KEY_FILE, rr_hostname);
2584 n += do_print_resource_record(pw,
2585 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname);
2586 n += do_print_resource_record(pw,
2587 _PATH_HOST_ED25519_KEY_FILE, rr_hostname);
2588 if (n == 0)
2589 fatal("no keys found.");
2590 exit(0);
2591 }
2592 }
2593
2594 #ifdef WITH_OPENSSL
2595 if (do_gen_candidates) {
2596 FILE *out = fopen(out_file, "w");
2597
2598 if (out == NULL) {
2599 error("Couldn't open modulus candidate file \"%s\": %s",
2600 out_file, strerror(errno));
2601 return (1);
2602 }
2603 if (bits == 0)
2604 bits = DEFAULT_BITS;
2605 if (gen_candidates(out, memory, bits, start) != 0)
2606 fatal("modulus candidate generation failed");
2607
2608 return (0);
2609 }
2610
2611 if (do_screen_candidates) {
2612 FILE *in;
2613 FILE *out = fopen(out_file, "a");
2614
2615 if (have_identity && strcmp(identity_file, "-") != 0) {
2616 if ((in = fopen(identity_file, "r")) == NULL) {
2617 fatal("Couldn't open modulus candidate "
2618 "file \"%s\": %s", identity_file,
2619 strerror(errno));
2620 }
2621 } else
2622 in = stdin;
2623
2624 if (out == NULL) {
2625 fatal("Couldn't open moduli file \"%s\": %s",
2626 out_file, strerror(errno));
2627 }
2628 if (prime_test(in, out, rounds == 0 ? 100 : rounds,
2629 generator_wanted, checkpoint,
2630 start_lineno, lines_to_process) != 0)
2631 fatal("modulus screening failed");
2632 return (0);
2633 }
2634 #endif
2635
2636 if (gen_all_hostkeys) {
2637 do_gen_all_hostkeys(pw);
2638 return (0);
2639 }
2640
2641 if (key_type_name == NULL)
2642 key_type_name = DEFAULT_KEY_TYPE_NAME;
2643
2644 type = sshkey_type_from_name(key_type_name);
2645 type_bits_valid(type, key_type_name, &bits);
2646
2647 if (!quiet)
2648 printf("Generating public/private %s key pair.\n",
2649 key_type_name);
2650 if ((r = sshkey_generate(type, bits, &private)) != 0)
2651 fatal("key_generate failed");
2652 if ((r = sshkey_from_private(private, &public)) != 0)
2653 fatal("key_from_private failed: %s\n", ssh_err(r));
2654
2655 if (!have_identity)
2656 ask_filename(pw, "Enter file in which to save the key");
2657
2658 /* Create ~/.ssh directory if it doesn't already exist. */
2659 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s",
2660 pw->pw_dir, _PATH_SSH_USER_DIR);
2661 if (strstr(identity_file, dotsshdir) != NULL) {
2662 if (stat(dotsshdir, &st) < 0) {
2663 if (errno != ENOENT) {
2664 error("Could not stat %s: %s", dotsshdir,
2665 strerror(errno));
2666 } else if (mkdir(dotsshdir, 0700) < 0) {
2667 error("Could not create directory '%s': %s",
2668 dotsshdir, strerror(errno));
2669 } else if (!quiet)
2670 printf("Created directory '%s'.\n", dotsshdir);
2671 }
2672 }
2673 /* If the file already exists, ask the user to confirm. */
2674 if (stat(identity_file, &st) >= 0) {
2675 char yesno[3];
2676 printf("%s already exists.\n", identity_file);
2677 printf("Overwrite (y/n)? ");
2678 fflush(stdout);
2679 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
2680 exit(1);
2681 if (yesno[0] != 'y' && yesno[0] != 'Y')
2682 exit(1);
2683 }
2684 /* Ask for a passphrase (twice). */
2685 if (identity_passphrase)
2686 passphrase1 = xstrdup(identity_passphrase);
2687 else if (identity_new_passphrase)
2688 passphrase1 = xstrdup(identity_new_passphrase);
2689 else {
2690 passphrase_again:
2691 passphrase1 =
2692 read_passphrase("Enter passphrase (empty for no "
2693 "passphrase): ", RP_ALLOW_STDIN);
2694 passphrase2 = read_passphrase("Enter same passphrase again: ",
2695 RP_ALLOW_STDIN);
2696 if (strcmp(passphrase1, passphrase2) != 0) {
2697 /*
2698 * The passphrases do not match. Clear them and
2699 * retry.
2700 */
2701 explicit_bzero(passphrase1, strlen(passphrase1));
2702 explicit_bzero(passphrase2, strlen(passphrase2));
2703 free(passphrase1);
2704 free(passphrase2);
2705 printf("Passphrases do not match. Try again.\n");
2706 goto passphrase_again;
2707 }
2708 /* Clear the other copy of the passphrase. */
2709 explicit_bzero(passphrase2, strlen(passphrase2));
2710 free(passphrase2);
2711 }
2712
2713 if (identity_comment) {
2714 strlcpy(comment, identity_comment, sizeof(comment));
2715 } else {
2716 /* Create default comment field for the passphrase. */
2717 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
2718 }
2719
2720 /* Save the key with the given passphrase and comment. */
2721 if ((r = sshkey_save_private(private, identity_file, passphrase1,
2722 comment, use_new_format, new_format_cipher, rounds)) != 0) {
2723 error("Saving key \"%s\" failed: %s",
2724 identity_file, ssh_err(r));
2725 explicit_bzero(passphrase1, strlen(passphrase1));
2726 free(passphrase1);
2727 exit(1);
2728 }
2729 /* Clear the passphrase. */
2730 explicit_bzero(passphrase1, strlen(passphrase1));
2731 free(passphrase1);
2732
2733 /* Clear the private key and the random number generator. */
2734 sshkey_free(private);
2735
2736 if (!quiet)
2737 printf("Your identification has been saved in %s.\n", identity_file);
2738
2739 strlcat(identity_file, ".pub", sizeof(identity_file));
2740 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
2741 fatal("Unable to save public key to %s: %s",
2742 identity_file, strerror(errno));
2743 if ((f = fdopen(fd, "w")) == NULL)
2744 fatal("fdopen %s failed: %s", identity_file, strerror(errno));
2745 if ((r = sshkey_write(public, f)) != 0)
2746 error("write key failed: %s", ssh_err(r));
2747 fprintf(f, " %s\n", comment);
2748 fclose(f);
2749
2750 if (!quiet) {
2751 fp = sshkey_fingerprint(public, fingerprint_hash,
2752 SSH_FP_DEFAULT);
2753 ra = sshkey_fingerprint(public, fingerprint_hash,
2754 SSH_FP_RANDOMART);
2755 if (fp == NULL || ra == NULL)
2756 fatal("sshkey_fingerprint failed");
2757 printf("Your public key has been saved in %s.\n",
2758 identity_file);
2759 printf("The key fingerprint is:\n");
2760 printf("%s %s\n", fp, comment);
2761 printf("The key's randomart image is:\n");
2762 printf("%s\n", ra);
2763 free(ra);
2764 free(fp);
2765 }
2766
2767 sshkey_free(public);
2768 exit(0);
2769 }
2770