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net: Allow binding of unspecified address without address existance
[dragonfly.git] / crypto / openssh / ssh-keygen.c
blob4b40768d517f9e3f71b4dcfb56f5bdd9e6406ea0
1 /* $OpenBSD: ssh-keygen.c,v 1.437 2021/09/08 03:23:44 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 #ifdef HAVE_STDINT_H
28 # include <stdint.h>
29 #endif
30 #include <errno.h>
31 #include <fcntl.h>
32 #include <netdb.h>
33 #ifdef HAVE_PATHS_H
34 # include <paths.h>
35 #endif
36 #include <pwd.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <limits.h>
43 #include <locale.h>
44 #include <time.h>
45
46 #include "xmalloc.h"
47 #include "sshkey.h"
48 #include "authfile.h"
49 #include "sshbuf.h"
50 #include "pathnames.h"
51 #include "log.h"
52 #include "misc.h"
53 #include "match.h"
54 #include "hostfile.h"
55 #include "dns.h"
56 #include "ssh.h"
57 #include "ssh2.h"
58 #include "ssherr.h"
59 #include "ssh-pkcs11.h"
60 #include "atomicio.h"
61 #include "krl.h"
62 #include "digest.h"
63 #include "utf8.h"
64 #include "authfd.h"
65 #include "sshsig.h"
66 #include "ssh-sk.h"
67 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */
68 #include "cipher.h"
69
70 #ifdef WITH_OPENSSL
71 # define DEFAULT_KEY_TYPE_NAME "rsa"
72 #else
73 # define DEFAULT_KEY_TYPE_NAME "ed25519"
74 #endif
75
76 /*
77 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be
78 * overridden on the command line.
79 *
80 * These values, with the exception of DSA, provide security equivalent to at
81 * least 128 bits of security according to NIST Special Publication 800-57:
82 * Recommendation for Key Management Part 1 rev 4 section 5.6.1.
83 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
84 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
85 * SHA1 we limit the DSA key size 1k bits.
86 */
87 #define DEFAULT_BITS 3072
88 #define DEFAULT_BITS_DSA 1024
89 #define DEFAULT_BITS_ECDSA 256
90
91 static int quiet = 0;
92
93 /* Flag indicating that we just want to see the key fingerprint */
94 static int print_fingerprint = 0;
95 static int print_bubblebabble = 0;
96
97 /* Hash algorithm to use for fingerprints. */
98 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
99
100 /* The identity file name, given on the command line or entered by the user. */
101 static char identity_file[PATH_MAX];
102 static int have_identity = 0;
103
104 /* This is set to the passphrase if given on the command line. */
105 static char *identity_passphrase = NULL;
106
107 /* This is set to the new passphrase if given on the command line. */
108 static char *identity_new_passphrase = NULL;
109
110 /* Key type when certifying */
111 static u_int cert_key_type = SSH2_CERT_TYPE_USER;
112
113 /* "key ID" of signed key */
114 static char *cert_key_id = NULL;
115
116 /* Comma-separated list of principal names for certifying keys */
117 static char *cert_principals = NULL;
118
119 /* Validity period for certificates */
120 static u_int64_t cert_valid_from = 0;
121 static u_int64_t cert_valid_to = ~0ULL;
122
123 /* Certificate options */
124 #define CERTOPT_X_FWD (1)
125 #define CERTOPT_AGENT_FWD (1<<1)
126 #define CERTOPT_PORT_FWD (1<<2)
127 #define CERTOPT_PTY (1<<3)
128 #define CERTOPT_USER_RC (1<<4)
129 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5)
130 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
131 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
132 static u_int32_t certflags_flags = CERTOPT_DEFAULT;
133 static char *certflags_command = NULL;
134 static char *certflags_src_addr = NULL;
135
136 /* Arbitrary extensions specified by user */
137 struct cert_ext {
138 char *key;
139 char *val;
140 int crit;
141 };
142 static struct cert_ext *cert_ext;
143 static size_t ncert_ext;
144
145 /* Conversion to/from various formats */
146 enum {
147 FMT_RFC4716,
148 FMT_PKCS8,
149 FMT_PEM
150 } convert_format = FMT_RFC4716;
151
152 static char *key_type_name = NULL;
153
154 /* Load key from this PKCS#11 provider */
155 static char *pkcs11provider = NULL;
156
157 /* FIDO/U2F provider to use */
158 static char *sk_provider = NULL;
159
160 /* Format for writing private keys */
161 static int private_key_format = SSHKEY_PRIVATE_OPENSSH;
162
163 /* Cipher for new-format private keys */
164 static char *openssh_format_cipher = NULL;
165
166 /* Number of KDF rounds to derive new format keys. */
167 static int rounds = 0;
168
169 /* argv0 */
170 extern char *__progname;
171
172 static char hostname[NI_MAXHOST];
173
174 #ifdef WITH_OPENSSL
175 /* moduli.c */
176 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
177 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
178 unsigned long);
179 #endif
180
181 static void
182 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
183 {
184 if (type == KEY_UNSPEC)
185 fatal("unknown key type %s", key_type_name);
186 if (*bitsp == 0) {
187 #ifdef WITH_OPENSSL
188 int nid;
189
190 switch(type) {
191 case KEY_DSA:
192 *bitsp = DEFAULT_BITS_DSA;
193 break;
194 case KEY_ECDSA:
195 if (name != NULL &&
196 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
197 *bitsp = sshkey_curve_nid_to_bits(nid);
198 if (*bitsp == 0)
199 *bitsp = DEFAULT_BITS_ECDSA;
200 break;
201 case KEY_RSA:
202 *bitsp = DEFAULT_BITS;
203 break;
204 }
205 #endif
206 }
207 #ifdef WITH_OPENSSL
208 switch (type) {
209 case KEY_DSA:
210 if (*bitsp != 1024)
211 fatal("Invalid DSA key length: must be 1024 bits");
212 break;
213 case KEY_RSA:
214 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
215 fatal("Invalid RSA key length: minimum is %d bits",
216 SSH_RSA_MINIMUM_MODULUS_SIZE);
217 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS)
218 fatal("Invalid RSA key length: maximum is %d bits",
219 OPENSSL_RSA_MAX_MODULUS_BITS);
220 break;
221 case KEY_ECDSA:
222 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
223 #ifdef OPENSSL_HAS_NISTP521
224 fatal("Invalid ECDSA key length: valid lengths are "
225 "256, 384 or 521 bits");
226 #else
227 fatal("Invalid ECDSA key length: valid lengths are "
228 "256 or 384 bits");
229 #endif
230 }
231 #endif
232 }
233
234 /*
235 * Checks whether a file exists and, if so, asks the user whether they wish
236 * to overwrite it.
237 * Returns nonzero if the file does not already exist or if the user agrees to
238 * overwrite, or zero otherwise.
239 */
240 static int
241 confirm_overwrite(const char *filename)
242 {
243 char yesno[3];
244 struct stat st;
245
246 if (stat(filename, &st) != 0)
247 return 1;
248 printf("%s already exists.\n", filename);
249 printf("Overwrite (y/n)? ");
250 fflush(stdout);
251 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
252 return 0;
253 if (yesno[0] != 'y' && yesno[0] != 'Y')
254 return 0;
255 return 1;
256 }
257
258 static void
259 ask_filename(struct passwd *pw, const char *prompt)
260 {
261 char buf[1024];
262 char *name = NULL;
263
264 if (key_type_name == NULL)
265 name = _PATH_SSH_CLIENT_ID_RSA;
266 else {
267 switch (sshkey_type_from_name(key_type_name)) {
268 case KEY_DSA_CERT:
269 case KEY_DSA:
270 name = _PATH_SSH_CLIENT_ID_DSA;
271 break;
272 #ifdef OPENSSL_HAS_ECC
273 case KEY_ECDSA_CERT:
274 case KEY_ECDSA:
275 name = _PATH_SSH_CLIENT_ID_ECDSA;
276 break;
277 case KEY_ECDSA_SK_CERT:
278 case KEY_ECDSA_SK:
279 name = _PATH_SSH_CLIENT_ID_ECDSA_SK;
280 break;
281 #endif
282 case KEY_RSA_CERT:
283 case KEY_RSA:
284 name = _PATH_SSH_CLIENT_ID_RSA;
285 break;
286 case KEY_ED25519:
287 case KEY_ED25519_CERT:
288 name = _PATH_SSH_CLIENT_ID_ED25519;
289 break;
290 case KEY_ED25519_SK:
291 case KEY_ED25519_SK_CERT:
292 name = _PATH_SSH_CLIENT_ID_ED25519_SK;
293 break;
294 case KEY_XMSS:
295 case KEY_XMSS_CERT:
296 name = _PATH_SSH_CLIENT_ID_XMSS;
297 break;
298 default:
299 fatal("bad key type");
300 }
301 }
302 snprintf(identity_file, sizeof(identity_file),
303 "%s/%s", pw->pw_dir, name);
304 printf("%s (%s): ", prompt, identity_file);
305 fflush(stdout);
306 if (fgets(buf, sizeof(buf), stdin) == NULL)
307 exit(1);
308 buf[strcspn(buf, "\n")] = '\0';
309 if (strcmp(buf, "") != 0)
310 strlcpy(identity_file, buf, sizeof(identity_file));
311 have_identity = 1;
312 }
313
314 static struct sshkey *
315 load_identity(const char *filename, char **commentp)
316 {
317 char *pass;
318 struct sshkey *prv;
319 int r;
320
321 if (commentp != NULL)
322 *commentp = NULL;
323 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0)
324 return prv;
325 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
326 fatal_r(r, "Load key \"%s\"", filename);
327 if (identity_passphrase)
328 pass = xstrdup(identity_passphrase);
329 else
330 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
331 r = sshkey_load_private(filename, pass, &prv, commentp);
332 freezero(pass, strlen(pass));
333 if (r != 0)
334 fatal_r(r, "Load key \"%s\"", filename);
335 return prv;
336 }
337
338 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
339 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
340 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
341 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
342
343 #ifdef WITH_OPENSSL
344 static void
345 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
346 {
347 struct sshbuf *b;
348 char comment[61], *b64;
349 int r;
350
351 if ((b = sshbuf_new()) == NULL)
352 fatal_f("sshbuf_new failed");
353 if ((r = sshkey_putb(k, b)) != 0)
354 fatal_fr(r, "put key");
355 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
356 fatal_f("sshbuf_dtob64_string failed");
357
358 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
359 snprintf(comment, sizeof(comment),
360 "%u-bit %s, converted by %s@%s from OpenSSH",
361 sshkey_size(k), sshkey_type(k),
362 pw->pw_name, hostname);
363
364 sshkey_free(k);
365 sshbuf_free(b);
366
367 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
368 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
369 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
370 free(b64);
371 exit(0);
372 }
373
374 static void
375 do_convert_to_pkcs8(struct sshkey *k)
376 {
377 switch (sshkey_type_plain(k->type)) {
378 case KEY_RSA:
379 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
380 fatal("PEM_write_RSA_PUBKEY failed");
381 break;
382 case KEY_DSA:
383 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
384 fatal("PEM_write_DSA_PUBKEY failed");
385 break;
386 #ifdef OPENSSL_HAS_ECC
387 case KEY_ECDSA:
388 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
389 fatal("PEM_write_EC_PUBKEY failed");
390 break;
391 #endif
392 default:
393 fatal_f("unsupported key type %s", sshkey_type(k));
394 }
395 exit(0);
396 }
397
398 static void
399 do_convert_to_pem(struct sshkey *k)
400 {
401 switch (sshkey_type_plain(k->type)) {
402 case KEY_RSA:
403 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
404 fatal("PEM_write_RSAPublicKey failed");
405 break;
406 case KEY_DSA:
407 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
408 fatal("PEM_write_DSA_PUBKEY failed");
409 break;
410 #ifdef OPENSSL_HAS_ECC
411 case KEY_ECDSA:
412 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
413 fatal("PEM_write_EC_PUBKEY failed");
414 break;
415 #endif
416 default:
417 fatal_f("unsupported key type %s", sshkey_type(k));
418 }
419 exit(0);
420 }
421
422 static void
423 do_convert_to(struct passwd *pw)
424 {
425 struct sshkey *k;
426 struct stat st;
427 int r;
428
429 if (!have_identity)
430 ask_filename(pw, "Enter file in which the key is");
431 if (stat(identity_file, &st) == -1)
432 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
433 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
434 k = load_identity(identity_file, NULL);
435 switch (convert_format) {
436 case FMT_RFC4716:
437 do_convert_to_ssh2(pw, k);
438 break;
439 case FMT_PKCS8:
440 do_convert_to_pkcs8(k);
441 break;
442 case FMT_PEM:
443 do_convert_to_pem(k);
444 break;
445 default:
446 fatal_f("unknown key format %d", convert_format);
447 }
448 exit(0);
449 }
450
451 /*
452 * This is almost exactly the bignum1 encoding, but with 32 bit for length
453 * instead of 16.
454 */
455 static void
456 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
457 {
458 u_int bytes, bignum_bits;
459 int r;
460
461 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
462 fatal_fr(r, "parse");
463 bytes = (bignum_bits + 7) / 8;
464 if (sshbuf_len(b) < bytes)
465 fatal_f("input buffer too small: need %d have %zu",
466 bytes, sshbuf_len(b));
467 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
468 fatal_f("BN_bin2bn failed");
469 if ((r = sshbuf_consume(b, bytes)) != 0)
470 fatal_fr(r, "consume");
471 }
472
473 static struct sshkey *
474 do_convert_private_ssh2(struct sshbuf *b)
475 {
476 struct sshkey *key = NULL;
477 char *type, *cipher;
478 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
479 int r, rlen, ktype;
480 u_int magic, i1, i2, i3, i4;
481 size_t slen;
482 u_long e;
483 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
484 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
485 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
486 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
487
488 if ((r = sshbuf_get_u32(b, &magic)) != 0)
489 fatal_fr(r, "parse magic");
490
491 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
492 error("bad magic 0x%x != 0x%x", magic,
493 SSH_COM_PRIVATE_KEY_MAGIC);
494 return NULL;
495 }
496 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
497 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
498 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
499 (r = sshbuf_get_u32(b, &i2)) != 0 ||
500 (r = sshbuf_get_u32(b, &i3)) != 0 ||
501 (r = sshbuf_get_u32(b, &i4)) != 0)
502 fatal_fr(r, "parse");
503 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
504 if (strcmp(cipher, "none") != 0) {
505 error("unsupported cipher %s", cipher);
506 free(cipher);
507 free(type);
508 return NULL;
509 }
510 free(cipher);
511
512 if (strstr(type, "dsa")) {
513 ktype = KEY_DSA;
514 } else if (strstr(type, "rsa")) {
515 ktype = KEY_RSA;
516 } else {
517 free(type);
518 return NULL;
519 }
520 if ((key = sshkey_new(ktype)) == NULL)
521 fatal("sshkey_new failed");
522 free(type);
523
524 switch (key->type) {
525 case KEY_DSA:
526 if ((dsa_p = BN_new()) == NULL ||
527 (dsa_q = BN_new()) == NULL ||
528 (dsa_g = BN_new()) == NULL ||
529 (dsa_pub_key = BN_new()) == NULL ||
530 (dsa_priv_key = BN_new()) == NULL)
531 fatal_f("BN_new");
532 buffer_get_bignum_bits(b, dsa_p);
533 buffer_get_bignum_bits(b, dsa_g);
534 buffer_get_bignum_bits(b, dsa_q);
535 buffer_get_bignum_bits(b, dsa_pub_key);
536 buffer_get_bignum_bits(b, dsa_priv_key);
537 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
538 fatal_f("DSA_set0_pqg failed");
539 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
540 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
541 fatal_f("DSA_set0_key failed");
542 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
543 break;
544 case KEY_RSA:
545 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
546 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
547 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
548 fatal_fr(r, "parse RSA");
549 e = e1;
550 debug("e %lx", e);
551 if (e < 30) {
552 e <<= 8;
553 e += e2;
554 debug("e %lx", e);
555 e <<= 8;
556 e += e3;
557 debug("e %lx", e);
558 }
559 if ((rsa_e = BN_new()) == NULL)
560 fatal_f("BN_new");
561 if (!BN_set_word(rsa_e, e)) {
562 BN_clear_free(rsa_e);
563 sshkey_free(key);
564 return NULL;
565 }
566 if ((rsa_n = BN_new()) == NULL ||
567 (rsa_d = BN_new()) == NULL ||
568 (rsa_p = BN_new()) == NULL ||
569 (rsa_q = BN_new()) == NULL ||
570 (rsa_iqmp = BN_new()) == NULL)
571 fatal_f("BN_new");
572 buffer_get_bignum_bits(b, rsa_d);
573 buffer_get_bignum_bits(b, rsa_n);
574 buffer_get_bignum_bits(b, rsa_iqmp);
575 buffer_get_bignum_bits(b, rsa_q);
576 buffer_get_bignum_bits(b, rsa_p);
577 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d))
578 fatal_f("RSA_set0_key failed");
579 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
580 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q))
581 fatal_f("RSA_set0_factors failed");
582 rsa_p = rsa_q = NULL; /* transferred */
583 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
584 fatal_fr(r, "generate RSA parameters");
585 BN_clear_free(rsa_iqmp);
586 break;
587 }
588 rlen = sshbuf_len(b);
589 if (rlen != 0)
590 error_f("remaining bytes in key blob %d", rlen);
591
592 /* try the key */
593 if (sshkey_sign(key, &sig, &slen, data, sizeof(data),
594 NULL, NULL, NULL, 0) != 0 ||
595 sshkey_verify(key, sig, slen, data, sizeof(data),
596 NULL, 0, NULL) != 0) {
597 sshkey_free(key);
598 free(sig);
599 return NULL;
600 }
601 free(sig);
602 return key;
603 }
604
605 static int
606 get_line(FILE *fp, char *line, size_t len)
607 {
608 int c;
609 size_t pos = 0;
610
611 line[0] = '\0';
612 while ((c = fgetc(fp)) != EOF) {
613 if (pos >= len - 1)
614 fatal("input line too long.");
615 switch (c) {
616 case '\r':
617 c = fgetc(fp);
618 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
619 fatal("unget: %s", strerror(errno));
620 return pos;
621 case '\n':
622 return pos;
623 }
624 line[pos++] = c;
625 line[pos] = '\0';
626 }
627 /* We reached EOF */
628 return -1;
629 }
630
631 static void
632 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
633 {
634 int r, blen, escaped = 0;
635 u_int len;
636 char line[1024];
637 struct sshbuf *buf;
638 char encoded[8096];
639 FILE *fp;
640
641 if ((buf = sshbuf_new()) == NULL)
642 fatal("sshbuf_new failed");
643 if ((fp = fopen(identity_file, "r")) == NULL)
644 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
645 encoded[0] = '\0';
646 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
647 if (blen > 0 && line[blen - 1] == '\\')
648 escaped++;
649 if (strncmp(line, "----", 4) == 0 ||
650 strstr(line, ": ") != NULL) {
651 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
652 *private = 1;
653 if (strstr(line, " END ") != NULL) {
654 break;
655 }
656 /* fprintf(stderr, "ignore: %s", line); */
657 continue;
658 }
659 if (escaped) {
660 escaped--;
661 /* fprintf(stderr, "escaped: %s", line); */
662 continue;
663 }
664 strlcat(encoded, line, sizeof(encoded));
665 }
666 len = strlen(encoded);
667 if (((len % 4) == 3) &&
668 (encoded[len-1] == '=') &&
669 (encoded[len-2] == '=') &&
670 (encoded[len-3] == '='))
671 encoded[len-3] = '\0';
672 if ((r = sshbuf_b64tod(buf, encoded)) != 0)
673 fatal_fr(r, "base64 decode");
674 if (*private) {
675 if ((*k = do_convert_private_ssh2(buf)) == NULL)
676 fatal_f("private key conversion failed");
677 } else if ((r = sshkey_fromb(buf, k)) != 0)
678 fatal_fr(r, "parse key");
679 sshbuf_free(buf);
680 fclose(fp);
681 }
682
683 static void
684 do_convert_from_pkcs8(struct sshkey **k, int *private)
685 {
686 EVP_PKEY *pubkey;
687 FILE *fp;
688
689 if ((fp = fopen(identity_file, "r")) == NULL)
690 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
691 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
692 fatal_f("%s is not a recognised public key format",
693 identity_file);
694 }
695 fclose(fp);
696 switch (EVP_PKEY_base_id(pubkey)) {
697 case EVP_PKEY_RSA:
698 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
699 fatal("sshkey_new failed");
700 (*k)->type = KEY_RSA;
701 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
702 break;
703 case EVP_PKEY_DSA:
704 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
705 fatal("sshkey_new failed");
706 (*k)->type = KEY_DSA;
707 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
708 break;
709 #ifdef OPENSSL_HAS_ECC
710 case EVP_PKEY_EC:
711 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
712 fatal("sshkey_new failed");
713 (*k)->type = KEY_ECDSA;
714 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
715 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
716 break;
717 #endif
718 default:
719 fatal_f("unsupported pubkey type %d",
720 EVP_PKEY_base_id(pubkey));
721 }
722 EVP_PKEY_free(pubkey);
723 return;
724 }
725
726 static void
727 do_convert_from_pem(struct sshkey **k, int *private)
728 {
729 FILE *fp;
730 RSA *rsa;
731
732 if ((fp = fopen(identity_file, "r")) == NULL)
733 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
734 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
735 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
736 fatal("sshkey_new failed");
737 (*k)->type = KEY_RSA;
738 (*k)->rsa = rsa;
739 fclose(fp);
740 return;
741 }
742 fatal_f("unrecognised raw private key format");
743 }
744
745 static void
746 do_convert_from(struct passwd *pw)
747 {
748 struct sshkey *k = NULL;
749 int r, private = 0, ok = 0;
750 struct stat st;
751
752 if (!have_identity)
753 ask_filename(pw, "Enter file in which the key is");
754 if (stat(identity_file, &st) == -1)
755 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
756
757 switch (convert_format) {
758 case FMT_RFC4716:
759 do_convert_from_ssh2(pw, &k, &private);
760 break;
761 case FMT_PKCS8:
762 do_convert_from_pkcs8(&k, &private);
763 break;
764 case FMT_PEM:
765 do_convert_from_pem(&k, &private);
766 break;
767 default:
768 fatal_f("unknown key format %d", convert_format);
769 }
770
771 if (!private) {
772 if ((r = sshkey_write(k, stdout)) == 0)
773 ok = 1;
774 if (ok)
775 fprintf(stdout, "\n");
776 } else {
777 switch (k->type) {
778 case KEY_DSA:
779 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
780 NULL, 0, NULL, NULL);
781 break;
782 #ifdef OPENSSL_HAS_ECC
783 case KEY_ECDSA:
784 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
785 NULL, 0, NULL, NULL);
786 break;
787 #endif
788 case KEY_RSA:
789 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
790 NULL, 0, NULL, NULL);
791 break;
792 default:
793 fatal_f("unsupported key type %s", sshkey_type(k));
794 }
795 }
796
797 if (!ok)
798 fatal("key write failed");
799 sshkey_free(k);
800 exit(0);
801 }
802 #endif
803
804 static void
805 do_print_public(struct passwd *pw)
806 {
807 struct sshkey *prv;
808 struct stat st;
809 int r;
810 char *comment = NULL;
811
812 if (!have_identity)
813 ask_filename(pw, "Enter file in which the key is");
814 if (stat(identity_file, &st) == -1)
815 fatal("%s: %s", identity_file, strerror(errno));
816 prv = load_identity(identity_file, &comment);
817 if ((r = sshkey_write(prv, stdout)) != 0)
818 fatal_fr(r, "write key");
819 if (comment != NULL && *comment != '\0')
820 fprintf(stdout, " %s", comment);
821 fprintf(stdout, "\n");
822 if (sshkey_is_sk(prv)) {
823 debug("sk_application: \"%s\", sk_flags 0x%02x",
824 prv->sk_application, prv->sk_flags);
825 }
826 sshkey_free(prv);
827 free(comment);
828 exit(0);
829 }
830
831 static void
832 do_download(struct passwd *pw)
833 {
834 #ifdef ENABLE_PKCS11
835 struct sshkey **keys = NULL;
836 int i, nkeys;
837 enum sshkey_fp_rep rep;
838 int fptype;
839 char *fp, *ra, **comments = NULL;
840
841 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
842 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
843
844 pkcs11_init(1);
845 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments);
846 if (nkeys <= 0)
847 fatal("cannot read public key from pkcs11");
848 for (i = 0; i < nkeys; i++) {
849 if (print_fingerprint) {
850 fp = sshkey_fingerprint(keys[i], fptype, rep);
851 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
852 SSH_FP_RANDOMART);
853 if (fp == NULL || ra == NULL)
854 fatal_f("sshkey_fingerprint fail");
855 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
856 fp, sshkey_type(keys[i]));
857 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
858 printf("%s\n", ra);
859 free(ra);
860 free(fp);
861 } else {
862 (void) sshkey_write(keys[i], stdout); /* XXX check */
863 fprintf(stdout, "%s%s\n",
864 *(comments[i]) == '\0' ? "" : " ", comments[i]);
865 }
866 free(comments[i]);
867 sshkey_free(keys[i]);
868 }
869 free(comments);
870 free(keys);
871 pkcs11_terminate();
872 exit(0);
873 #else
874 fatal("no pkcs11 support");
875 #endif /* ENABLE_PKCS11 */
876 }
877
878 static struct sshkey *
879 try_read_key(char **cpp)
880 {
881 struct sshkey *ret;
882 int r;
883
884 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
885 fatal("sshkey_new failed");
886 if ((r = sshkey_read(ret, cpp)) == 0)
887 return ret;
888 /* Not a key */
889 sshkey_free(ret);
890 return NULL;
891 }
892
893 static void
894 fingerprint_one_key(const struct sshkey *public, const char *comment)
895 {
896 char *fp = NULL, *ra = NULL;
897 enum sshkey_fp_rep rep;
898 int fptype;
899
900 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
901 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
902 fp = sshkey_fingerprint(public, fptype, rep);
903 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
904 if (fp == NULL || ra == NULL)
905 fatal_f("sshkey_fingerprint failed");
906 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
907 comment ? comment : "no comment", sshkey_type(public));
908 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
909 printf("%s\n", ra);
910 free(ra);
911 free(fp);
912 }
913
914 static void
915 fingerprint_private(const char *path)
916 {
917 struct stat st;
918 char *comment = NULL;
919 struct sshkey *privkey = NULL, *pubkey = NULL;
920 int r;
921
922 if (stat(identity_file, &st) == -1)
923 fatal("%s: %s", path, strerror(errno));
924 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0)
925 debug_r(r, "load public \"%s\"", path);
926 if (pubkey == NULL || comment == NULL || *comment == '\0') {
927 free(comment);
928 if ((r = sshkey_load_private(path, NULL,
929 &privkey, &comment)) != 0)
930 debug_r(r, "load private \"%s\"", path);
931 }
932 if (pubkey == NULL && privkey == NULL)
933 fatal("%s is not a key file.", path);
934
935 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment);
936 sshkey_free(pubkey);
937 sshkey_free(privkey);
938 free(comment);
939 }
940
941 static void
942 do_fingerprint(struct passwd *pw)
943 {
944 FILE *f;
945 struct sshkey *public = NULL;
946 char *comment = NULL, *cp, *ep, *line = NULL;
947 size_t linesize = 0;
948 int i, invalid = 1;
949 const char *path;
950 u_long lnum = 0;
951
952 if (!have_identity)
953 ask_filename(pw, "Enter file in which the key is");
954 path = identity_file;
955
956 if (strcmp(identity_file, "-") == 0) {
957 f = stdin;
958 path = "(stdin)";
959 } else if ((f = fopen(path, "r")) == NULL)
960 fatal("%s: %s: %s", __progname, path, strerror(errno));
961
962 while (getline(&line, &linesize, f) != -1) {
963 lnum++;
964 cp = line;
965 cp[strcspn(cp, "\n")] = '\0';
966 /* Trim leading space and comments */
967 cp = line + strspn(line, " \t");
968 if (*cp == '#' || *cp == '\0')
969 continue;
970
971 /*
972 * Input may be plain keys, private keys, authorized_keys
973 * or known_hosts.
974 */
975
976 /*
977 * Try private keys first. Assume a key is private if
978 * "SSH PRIVATE KEY" appears on the first line and we're
979 * not reading from stdin (XXX support private keys on stdin).
980 */
981 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
982 strstr(cp, "PRIVATE KEY") != NULL) {
983 free(line);
984 fclose(f);
985 fingerprint_private(path);
986 exit(0);
987 }
988
989 /*
990 * If it's not a private key, then this must be prepared to
991 * accept a public key prefixed with a hostname or options.
992 * Try a bare key first, otherwise skip the leading stuff.
993 */
994 if ((public = try_read_key(&cp)) == NULL) {
995 i = strtol(cp, &ep, 10);
996 if (i == 0 || ep == NULL ||
997 (*ep != ' ' && *ep != '\t')) {
998 int quoted = 0;
999
1000 comment = cp;
1001 for (; *cp && (quoted || (*cp != ' ' &&
1002 *cp != '\t')); cp++) {
1003 if (*cp == '\\' && cp[1] == '"')
1004 cp++; /* Skip both */
1005 else if (*cp == '"')
1006 quoted = !quoted;
1007 }
1008 if (!*cp)
1009 continue;
1010 *cp++ = '\0';
1011 }
1012 }
1013 /* Retry after parsing leading hostname/key options */
1014 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
1015 debug("%s:%lu: not a public key", path, lnum);
1016 continue;
1017 }
1018
1019 /* Find trailing comment, if any */
1020 for (; *cp == ' ' || *cp == '\t'; cp++)
1021 ;
1022 if (*cp != '\0' && *cp != '#')
1023 comment = cp;
1024
1025 fingerprint_one_key(public, comment);
1026 sshkey_free(public);
1027 invalid = 0; /* One good key in the file is sufficient */
1028 }
1029 fclose(f);
1030 free(line);
1031
1032 if (invalid)
1033 fatal("%s is not a public key file.", path);
1034 exit(0);
1035 }
1036
1037 static void
1038 do_gen_all_hostkeys(struct passwd *pw)
1039 {
1040 struct {
1041 char *key_type;
1042 char *key_type_display;
1043 char *path;
1044 } key_types[] = {
1045 #ifdef WITH_OPENSSL
1046 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
1047 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE },
1048 #ifdef OPENSSL_HAS_ECC
1049 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
1050 #endif /* OPENSSL_HAS_ECC */
1051 #endif /* WITH_OPENSSL */
1052 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
1053 #ifdef WITH_XMSS
1054 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE },
1055 #endif /* WITH_XMSS */
1056 { NULL, NULL, NULL }
1057 };
1058
1059 u_int32_t bits = 0;
1060 int first = 0;
1061 struct stat st;
1062 struct sshkey *private, *public;
1063 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1064 int i, type, fd, r;
1065
1066 for (i = 0; key_types[i].key_type; i++) {
1067 public = private = NULL;
1068 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1069
1070 xasprintf(&prv_file, "%s%s",
1071 identity_file, key_types[i].path);
1072
1073 /* Check whether private key exists and is not zero-length */
1074 if (stat(prv_file, &st) == 0) {
1075 if (st.st_size != 0)
1076 goto next;
1077 } else if (errno != ENOENT) {
1078 error("Could not stat %s: %s", key_types[i].path,
1079 strerror(errno));
1080 goto failnext;
1081 }
1082
1083 /*
1084 * Private key doesn't exist or is invalid; proceed with
1085 * key generation.
1086 */
1087 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1088 identity_file, key_types[i].path);
1089 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1090 identity_file, key_types[i].path);
1091 xasprintf(&pub_file, "%s%s.pub",
1092 identity_file, key_types[i].path);
1093
1094 if (first == 0) {
1095 first = 1;
1096 printf("%s: generating new host keys: ", __progname);
1097 }
1098 printf("%s ", key_types[i].key_type_display);
1099 fflush(stdout);
1100 type = sshkey_type_from_name(key_types[i].key_type);
1101 if ((fd = mkstemp(prv_tmp)) == -1) {
1102 error("Could not save your private key in %s: %s",
1103 prv_tmp, strerror(errno));
1104 goto failnext;
1105 }
1106 (void)close(fd); /* just using mkstemp() to reserve a name */
1107 bits = 0;
1108 type_bits_valid(type, NULL, &bits);
1109 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1110 error_r(r, "sshkey_generate failed");
1111 goto failnext;
1112 }
1113 if ((r = sshkey_from_private(private, &public)) != 0)
1114 fatal_fr(r, "sshkey_from_private");
1115 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1116 hostname);
1117 if ((r = sshkey_save_private(private, prv_tmp, "",
1118 comment, private_key_format, openssh_format_cipher,
1119 rounds)) != 0) {
1120 error_r(r, "Saving key \"%s\" failed", prv_tmp);
1121 goto failnext;
1122 }
1123 if ((fd = mkstemp(pub_tmp)) == -1) {
1124 error("Could not save your public key in %s: %s",
1125 pub_tmp, strerror(errno));
1126 goto failnext;
1127 }
1128 (void)fchmod(fd, 0644);
1129 (void)close(fd);
1130 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) {
1131 error_r(r, "Unable to save public key to %s",
1132 identity_file);
1133 goto failnext;
1134 }
1135
1136 /* Rename temporary files to their permanent locations. */
1137 if (rename(pub_tmp, pub_file) != 0) {
1138 error("Unable to move %s into position: %s",
1139 pub_file, strerror(errno));
1140 goto failnext;
1141 }
1142 if (rename(prv_tmp, prv_file) != 0) {
1143 error("Unable to move %s into position: %s",
1144 key_types[i].path, strerror(errno));
1145 failnext:
1146 first = 0;
1147 goto next;
1148 }
1149 next:
1150 sshkey_free(private);
1151 sshkey_free(public);
1152 free(prv_tmp);
1153 free(pub_tmp);
1154 free(prv_file);
1155 free(pub_file);
1156 }
1157 if (first != 0)
1158 printf("\n");
1159 }
1160
1161 struct known_hosts_ctx {
1162 const char *host; /* Hostname searched for in find/delete case */
1163 FILE *out; /* Output file, stdout for find_hosts case */
1164 int has_unhashed; /* When hashing, original had unhashed hosts */
1165 int found_key; /* For find/delete, host was found */
1166 int invalid; /* File contained invalid items; don't delete */
1167 int hash_hosts; /* Hash hostnames as we go */
1168 int find_host; /* Search for specific hostname */
1169 int delete_host; /* Delete host from known_hosts */
1170 };
1171
1172 static int
1173 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1174 {
1175 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1176 char *hashed, *cp, *hosts, *ohosts;
1177 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1178 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1179
1180 switch (l->status) {
1181 case HKF_STATUS_OK:
1182 case HKF_STATUS_MATCHED:
1183 /*
1184 * Don't hash hosts already already hashed, with wildcard
1185 * characters or a CA/revocation marker.
1186 */
1187 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1188 fprintf(ctx->out, "%s\n", l->line);
1189 if (has_wild && !ctx->find_host) {
1190 logit("%s:%lu: ignoring host name "
1191 "with wildcard: %.64s", l->path,
1192 l->linenum, l->hosts);
1193 }
1194 return 0;
1195 }
1196 /*
1197 * Split any comma-separated hostnames from the host list,
1198 * hash and store separately.
1199 */
1200 ohosts = hosts = xstrdup(l->hosts);
1201 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1202 lowercase(cp);
1203 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1204 fatal("hash_host failed");
1205 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1206 ctx->has_unhashed = 1;
1207 }
1208 free(ohosts);
1209 return 0;
1210 case HKF_STATUS_INVALID:
1211 /* Retain invalid lines, but mark file as invalid. */
1212 ctx->invalid = 1;
1213 logit("%s:%lu: invalid line", l->path, l->linenum);
1214 /* FALLTHROUGH */
1215 default:
1216 fprintf(ctx->out, "%s\n", l->line);
1217 return 0;
1218 }
1219 /* NOTREACHED */
1220 return -1;
1221 }
1222
1223 static int
1224 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1225 {
1226 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1227 enum sshkey_fp_rep rep;
1228 int fptype;
1229 char *fp = NULL, *ra = NULL;
1230
1231 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1232 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1233
1234 if (l->status == HKF_STATUS_MATCHED) {
1235 if (ctx->delete_host) {
1236 if (l->marker != MRK_NONE) {
1237 /* Don't remove CA and revocation lines */
1238 fprintf(ctx->out, "%s\n", l->line);
1239 } else {
1240 /*
1241 * Hostname matches and has no CA/revoke
1242 * marker, delete it by *not* writing the
1243 * line to ctx->out.
1244 */
1245 ctx->found_key = 1;
1246 if (!quiet)
1247 printf("# Host %s found: line %lu\n",
1248 ctx->host, l->linenum);
1249 }
1250 return 0;
1251 } else if (ctx->find_host) {
1252 ctx->found_key = 1;
1253 if (!quiet) {
1254 printf("# Host %s found: line %lu %s\n",
1255 ctx->host,
1256 l->linenum, l->marker == MRK_CA ? "CA" :
1257 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1258 }
1259 if (ctx->hash_hosts)
1260 known_hosts_hash(l, ctx);
1261 else if (print_fingerprint) {
1262 fp = sshkey_fingerprint(l->key, fptype, rep);
1263 ra = sshkey_fingerprint(l->key,
1264 fingerprint_hash, SSH_FP_RANDOMART);
1265 if (fp == NULL || ra == NULL)
1266 fatal_f("sshkey_fingerprint failed");
1267 mprintf("%s %s %s%s%s\n", ctx->host,
1268 sshkey_type(l->key), fp,
1269 l->comment[0] ? " " : "",
1270 l->comment);
1271 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
1272 printf("%s\n", ra);
1273 free(ra);
1274 free(fp);
1275 } else
1276 fprintf(ctx->out, "%s\n", l->line);
1277 return 0;
1278 }
1279 } else if (ctx->delete_host) {
1280 /* Retain non-matching hosts when deleting */
1281 if (l->status == HKF_STATUS_INVALID) {
1282 ctx->invalid = 1;
1283 logit("%s:%lu: invalid line", l->path, l->linenum);
1284 }
1285 fprintf(ctx->out, "%s\n", l->line);
1286 }
1287 return 0;
1288 }
1289
1290 static void
1291 do_known_hosts(struct passwd *pw, const char *name, int find_host,
1292 int delete_host, int hash_hosts)
1293 {
1294 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1295 int r, fd, oerrno, inplace = 0;
1296 struct known_hosts_ctx ctx;
1297 u_int foreach_options;
1298 struct stat sb;
1299
1300 if (!have_identity) {
1301 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1302 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1303 sizeof(identity_file))
1304 fatal("Specified known hosts path too long");
1305 free(cp);
1306 have_identity = 1;
1307 }
1308 if (stat(identity_file, &sb) != 0)
1309 fatal("Cannot stat %s: %s", identity_file, strerror(errno));
1310
1311 memset(&ctx, 0, sizeof(ctx));
1312 ctx.out = stdout;
1313 ctx.host = name;
1314 ctx.hash_hosts = hash_hosts;
1315 ctx.find_host = find_host;
1316 ctx.delete_host = delete_host;
1317
1318 /*
1319 * Find hosts goes to stdout, hash and deletions happen in-place
1320 * A corner case is ssh-keygen -HF foo, which should go to stdout
1321 */
1322 if (!find_host && (hash_hosts || delete_host)) {
1323 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1324 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1325 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1326 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1327 fatal("known_hosts path too long");
1328 umask(077);
1329 if ((fd = mkstemp(tmp)) == -1)
1330 fatal("mkstemp: %s", strerror(errno));
1331 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1332 oerrno = errno;
1333 unlink(tmp);
1334 fatal("fdopen: %s", strerror(oerrno));
1335 }
1336 fchmod(fd, sb.st_mode & 0644);
1337 inplace = 1;
1338 }
1339 /* XXX support identity_file == "-" for stdin */
1340 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1341 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1342 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ?
1343 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL,
1344 foreach_options, 0)) != 0) {
1345 if (inplace)
1346 unlink(tmp);
1347 fatal_fr(r, "hostkeys_foreach");
1348 }
1349
1350 if (inplace)
1351 fclose(ctx.out);
1352
1353 if (ctx.invalid) {
1354 error("%s is not a valid known_hosts file.", identity_file);
1355 if (inplace) {
1356 error("Not replacing existing known_hosts "
1357 "file because of errors");
1358 unlink(tmp);
1359 }
1360 exit(1);
1361 } else if (delete_host && !ctx.found_key) {
1362 logit("Host %s not found in %s", name, identity_file);
1363 if (inplace)
1364 unlink(tmp);
1365 } else if (inplace) {
1366 /* Backup existing file */
1367 if (unlink(old) == -1 && errno != ENOENT)
1368 fatal("unlink %.100s: %s", old, strerror(errno));
1369 if (link(identity_file, old) == -1)
1370 fatal("link %.100s to %.100s: %s", identity_file, old,
1371 strerror(errno));
1372 /* Move new one into place */
1373 if (rename(tmp, identity_file) == -1) {
1374 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1375 strerror(errno));
1376 unlink(tmp);
1377 unlink(old);
1378 exit(1);
1379 }
1380
1381 printf("%s updated.\n", identity_file);
1382 printf("Original contents retained as %s\n", old);
1383 if (ctx.has_unhashed) {
1384 logit("WARNING: %s contains unhashed entries", old);
1385 logit("Delete this file to ensure privacy "
1386 "of hostnames");
1387 }
1388 }
1389
1390 exit (find_host && !ctx.found_key);
1391 }
1392
1393 /*
1394 * Perform changing a passphrase. The argument is the passwd structure
1395 * for the current user.
1396 */
1397 static void
1398 do_change_passphrase(struct passwd *pw)
1399 {
1400 char *comment;
1401 char *old_passphrase, *passphrase1, *passphrase2;
1402 struct stat st;
1403 struct sshkey *private;
1404 int r;
1405
1406 if (!have_identity)
1407 ask_filename(pw, "Enter file in which the key is");
1408 if (stat(identity_file, &st) == -1)
1409 fatal("%s: %s", identity_file, strerror(errno));
1410 /* Try to load the file with empty passphrase. */
1411 r = sshkey_load_private(identity_file, "", &private, &comment);
1412 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1413 if (identity_passphrase)
1414 old_passphrase = xstrdup(identity_passphrase);
1415 else
1416 old_passphrase =
1417 read_passphrase("Enter old passphrase: ",
1418 RP_ALLOW_STDIN);
1419 r = sshkey_load_private(identity_file, old_passphrase,
1420 &private, &comment);
1421 freezero(old_passphrase, strlen(old_passphrase));
1422 if (r != 0)
1423 goto badkey;
1424 } else if (r != 0) {
1425 badkey:
1426 fatal_r(r, "Failed to load key %s", identity_file);
1427 }
1428 if (comment)
1429 mprintf("Key has comment '%s'\n", comment);
1430
1431 /* Ask the new passphrase (twice). */
1432 if (identity_new_passphrase) {
1433 passphrase1 = xstrdup(identity_new_passphrase);
1434 passphrase2 = NULL;
1435 } else {
1436 passphrase1 =
1437 read_passphrase("Enter new passphrase (empty for no "
1438 "passphrase): ", RP_ALLOW_STDIN);
1439 passphrase2 = read_passphrase("Enter same passphrase again: ",
1440 RP_ALLOW_STDIN);
1441
1442 /* Verify that they are the same. */
1443 if (strcmp(passphrase1, passphrase2) != 0) {
1444 explicit_bzero(passphrase1, strlen(passphrase1));
1445 explicit_bzero(passphrase2, strlen(passphrase2));
1446 free(passphrase1);
1447 free(passphrase2);
1448 printf("Pass phrases do not match. Try again.\n");
1449 exit(1);
1450 }
1451 /* Destroy the other copy. */
1452 freezero(passphrase2, strlen(passphrase2));
1453 }
1454
1455 /* Save the file using the new passphrase. */
1456 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1457 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
1458 error_r(r, "Saving key \"%s\" failed", identity_file);
1459 freezero(passphrase1, strlen(passphrase1));
1460 sshkey_free(private);
1461 free(comment);
1462 exit(1);
1463 }
1464 /* Destroy the passphrase and the copy of the key in memory. */
1465 freezero(passphrase1, strlen(passphrase1));
1466 sshkey_free(private); /* Destroys contents */
1467 free(comment);
1468
1469 printf("Your identification has been saved with the new passphrase.\n");
1470 exit(0);
1471 }
1472
1473 /*
1474 * Print the SSHFP RR.
1475 */
1476 static int
1477 do_print_resource_record(struct passwd *pw, char *fname, char *hname,
1478 int print_generic)
1479 {
1480 struct sshkey *public;
1481 char *comment = NULL;
1482 struct stat st;
1483 int r;
1484
1485 if (fname == NULL)
1486 fatal_f("no filename");
1487 if (stat(fname, &st) == -1) {
1488 if (errno == ENOENT)
1489 return 0;
1490 fatal("%s: %s", fname, strerror(errno));
1491 }
1492 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1493 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname);
1494 export_dns_rr(hname, public, stdout, print_generic);
1495 sshkey_free(public);
1496 free(comment);
1497 return 1;
1498 }
1499
1500 /*
1501 * Change the comment of a private key file.
1502 */
1503 static void
1504 do_change_comment(struct passwd *pw, const char *identity_comment)
1505 {
1506 char new_comment[1024], *comment, *passphrase;
1507 struct sshkey *private;
1508 struct sshkey *public;
1509 struct stat st;
1510 int r;
1511
1512 if (!have_identity)
1513 ask_filename(pw, "Enter file in which the key is");
1514 if (stat(identity_file, &st) == -1)
1515 fatal("%s: %s", identity_file, strerror(errno));
1516 if ((r = sshkey_load_private(identity_file, "",
1517 &private, &comment)) == 0)
1518 passphrase = xstrdup("");
1519 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1520 fatal_r(r, "Cannot load private key \"%s\"", identity_file);
1521 else {
1522 if (identity_passphrase)
1523 passphrase = xstrdup(identity_passphrase);
1524 else if (identity_new_passphrase)
1525 passphrase = xstrdup(identity_new_passphrase);
1526 else
1527 passphrase = read_passphrase("Enter passphrase: ",
1528 RP_ALLOW_STDIN);
1529 /* Try to load using the passphrase. */
1530 if ((r = sshkey_load_private(identity_file, passphrase,
1531 &private, &comment)) != 0) {
1532 freezero(passphrase, strlen(passphrase));
1533 fatal_r(r, "Cannot load private key \"%s\"",
1534 identity_file);
1535 }
1536 }
1537
1538 if (private->type != KEY_ED25519 && private->type != KEY_XMSS &&
1539 private_key_format != SSHKEY_PRIVATE_OPENSSH) {
1540 error("Comments are only supported for keys stored in "
1541 "the new format (-o).");
1542 explicit_bzero(passphrase, strlen(passphrase));
1543 sshkey_free(private);
1544 exit(1);
1545 }
1546 if (comment)
1547 printf("Old comment: %s\n", comment);
1548 else
1549 printf("No existing comment\n");
1550
1551 if (identity_comment) {
1552 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1553 } else {
1554 printf("New comment: ");
1555 fflush(stdout);
1556 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1557 explicit_bzero(passphrase, strlen(passphrase));
1558 sshkey_free(private);
1559 exit(1);
1560 }
1561 new_comment[strcspn(new_comment, "\n")] = '\0';
1562 }
1563 if (comment != NULL && strcmp(comment, new_comment) == 0) {
1564 printf("No change to comment\n");
1565 free(passphrase);
1566 sshkey_free(private);
1567 free(comment);
1568 exit(0);
1569 }
1570
1571 /* Save the file using the new passphrase. */
1572 if ((r = sshkey_save_private(private, identity_file, passphrase,
1573 new_comment, private_key_format, openssh_format_cipher,
1574 rounds)) != 0) {
1575 error_r(r, "Saving key \"%s\" failed", identity_file);
1576 freezero(passphrase, strlen(passphrase));
1577 sshkey_free(private);
1578 free(comment);
1579 exit(1);
1580 }
1581 freezero(passphrase, strlen(passphrase));
1582 if ((r = sshkey_from_private(private, &public)) != 0)
1583 fatal_fr(r, "sshkey_from_private");
1584 sshkey_free(private);
1585
1586 strlcat(identity_file, ".pub", sizeof(identity_file));
1587 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0)
1588 fatal_r(r, "Unable to save public key to %s", identity_file);
1589 sshkey_free(public);
1590 free(comment);
1591
1592 if (strlen(new_comment) > 0)
1593 printf("Comment '%s' applied\n", new_comment);
1594 else
1595 printf("Comment removed\n");
1596
1597 exit(0);
1598 }
1599
1600 static void
1601 cert_ext_add(const char *key, const char *value, int iscrit)
1602 {
1603 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext));
1604 cert_ext[ncert_ext].key = xstrdup(key);
1605 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value);
1606 cert_ext[ncert_ext].crit = iscrit;
1607 ncert_ext++;
1608 }
1609
1610 /* qsort(3) comparison function for certificate extensions */
1611 static int
1612 cert_ext_cmp(const void *_a, const void *_b)
1613 {
1614 const struct cert_ext *a = (const struct cert_ext *)_a;
1615 const struct cert_ext *b = (const struct cert_ext *)_b;
1616 int r;
1617
1618 if (a->crit != b->crit)
1619 return (a->crit < b->crit) ? -1 : 1;
1620 if ((r = strcmp(a->key, b->key)) != 0)
1621 return r;
1622 if ((a->val == NULL) != (b->val == NULL))
1623 return (a->val == NULL) ? -1 : 1;
1624 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0)
1625 return r;
1626 return 0;
1627 }
1628
1629 #define OPTIONS_CRITICAL 1
1630 #define OPTIONS_EXTENSIONS 2
1631 static void
1632 prepare_options_buf(struct sshbuf *c, int which)
1633 {
1634 struct sshbuf *b;
1635 size_t i;
1636 int r;
1637 const struct cert_ext *ext;
1638
1639 if ((b = sshbuf_new()) == NULL)
1640 fatal_f("sshbuf_new failed");
1641 sshbuf_reset(c);
1642 for (i = 0; i < ncert_ext; i++) {
1643 ext = &cert_ext[i];
1644 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) ||
1645 (!ext->crit && (which & OPTIONS_CRITICAL)))
1646 continue;
1647 if (ext->val == NULL) {
1648 /* flag option */
1649 debug3_f("%s", ext->key);
1650 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1651 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1652 fatal_fr(r, "prepare flag");
1653 } else {
1654 /* key/value option */
1655 debug3_f("%s=%s", ext->key, ext->val);
1656 sshbuf_reset(b);
1657 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1658 (r = sshbuf_put_cstring(b, ext->val)) != 0 ||
1659 (r = sshbuf_put_stringb(c, b)) != 0)
1660 fatal_fr(r, "prepare k/v");
1661 }
1662 }
1663 sshbuf_free(b);
1664 }
1665
1666 static void
1667 finalise_cert_exts(void)
1668 {
1669 /* critical options */
1670 if (certflags_command != NULL)
1671 cert_ext_add("force-command", certflags_command, 1);
1672 if (certflags_src_addr != NULL)
1673 cert_ext_add("source-address", certflags_src_addr, 1);
1674 /* extensions */
1675 if ((certflags_flags & CERTOPT_X_FWD) != 0)
1676 cert_ext_add("permit-X11-forwarding", NULL, 0);
1677 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0)
1678 cert_ext_add("permit-agent-forwarding", NULL, 0);
1679 if ((certflags_flags & CERTOPT_PORT_FWD) != 0)
1680 cert_ext_add("permit-port-forwarding", NULL, 0);
1681 if ((certflags_flags & CERTOPT_PTY) != 0)
1682 cert_ext_add("permit-pty", NULL, 0);
1683 if ((certflags_flags & CERTOPT_USER_RC) != 0)
1684 cert_ext_add("permit-user-rc", NULL, 0);
1685 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0)
1686 cert_ext_add("no-touch-required", NULL, 0);
1687 /* order lexically by key */
1688 if (ncert_ext > 0)
1689 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp);
1690 }
1691
1692 static struct sshkey *
1693 load_pkcs11_key(char *path)
1694 {
1695 #ifdef ENABLE_PKCS11
1696 struct sshkey **keys = NULL, *public, *private = NULL;
1697 int r, i, nkeys;
1698
1699 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1700 fatal_r(r, "Couldn't load CA public key \"%s\"", path);
1701
1702 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase,
1703 &keys, NULL);
1704 debug3_f("%d keys", nkeys);
1705 if (nkeys <= 0)
1706 fatal("cannot read public key from pkcs11");
1707 for (i = 0; i < nkeys; i++) {
1708 if (sshkey_equal_public(public, keys[i])) {
1709 private = keys[i];
1710 continue;
1711 }
1712 sshkey_free(keys[i]);
1713 }
1714 free(keys);
1715 sshkey_free(public);
1716 return private;
1717 #else
1718 fatal("no pkcs11 support");
1719 #endif /* ENABLE_PKCS11 */
1720 }
1721
1722 /* Signer for sshkey_certify_custom that uses the agent */
1723 static int
1724 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp,
1725 const u_char *data, size_t datalen,
1726 const char *alg, const char *provider, const char *pin,
1727 u_int compat, void *ctx)
1728 {
1729 int *agent_fdp = (int *)ctx;
1730
1731 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1732 data, datalen, alg, compat);
1733 }
1734
1735 static void
1736 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent,
1737 unsigned long long cert_serial, int cert_serial_autoinc,
1738 int argc, char **argv)
1739 {
1740 int r, i, found, agent_fd = -1;
1741 u_int n;
1742 struct sshkey *ca, *public;
1743 char valid[64], *otmp, *tmp, *cp, *out, *comment;
1744 char *ca_fp = NULL, **plist = NULL, *pin = NULL;
1745 struct ssh_identitylist *agent_ids;
1746 size_t j;
1747 struct notifier_ctx *notifier = NULL;
1748
1749 #ifdef ENABLE_PKCS11
1750 pkcs11_init(1);
1751 #endif
1752 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1753 if (pkcs11provider != NULL) {
1754 /* If a PKCS#11 token was specified then try to use it */
1755 if ((ca = load_pkcs11_key(tmp)) == NULL)
1756 fatal("No PKCS#11 key matching %s found", ca_key_path);
1757 } else if (prefer_agent) {
1758 /*
1759 * Agent signature requested. Try to use agent after making
1760 * sure the public key specified is actually present in the
1761 * agent.
1762 */
1763 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1764 fatal_r(r, "Cannot load CA public key %s", tmp);
1765 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1766 fatal_r(r, "Cannot use public key for CA signature");
1767 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1768 fatal_r(r, "Retrieve agent key list");
1769 found = 0;
1770 for (j = 0; j < agent_ids->nkeys; j++) {
1771 if (sshkey_equal(ca, agent_ids->keys[j])) {
1772 found = 1;
1773 break;
1774 }
1775 }
1776 if (!found)
1777 fatal("CA key %s not found in agent", tmp);
1778 ssh_free_identitylist(agent_ids);
1779 ca->flags |= SSHKEY_FLAG_EXT;
1780 } else {
1781 /* CA key is assumed to be a private key on the filesystem */
1782 ca = load_identity(tmp, NULL);
1783 if (sshkey_is_sk(ca) &&
1784 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
1785 if ((pin = read_passphrase("Enter PIN for CA key: ",
1786 RP_ALLOW_STDIN)) == NULL)
1787 fatal_f("couldn't read PIN");
1788 }
1789 }
1790 free(tmp);
1791
1792 if (key_type_name != NULL) {
1793 if (sshkey_type_from_name(key_type_name) != ca->type) {
1794 fatal("CA key type %s doesn't match specified %s",
1795 sshkey_ssh_name(ca), key_type_name);
1796 }
1797 } else if (ca->type == KEY_RSA) {
1798 /* Default to a good signature algorithm */
1799 key_type_name = "rsa-sha2-512";
1800 }
1801 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT);
1802
1803 finalise_cert_exts();
1804 for (i = 0; i < argc; i++) {
1805 /* Split list of principals */
1806 n = 0;
1807 if (cert_principals != NULL) {
1808 otmp = tmp = xstrdup(cert_principals);
1809 plist = NULL;
1810 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1811 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1812 if (*(plist[n] = xstrdup(cp)) == '\0')
1813 fatal("Empty principal name");
1814 }
1815 free(otmp);
1816 }
1817 if (n > SSHKEY_CERT_MAX_PRINCIPALS)
1818 fatal("Too many certificate principals specified");
1819
1820 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1821 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1822 fatal_r(r, "load pubkey \"%s\"", tmp);
1823 if (sshkey_is_cert(public))
1824 fatal_f("key \"%s\" type %s cannot be certified",
1825 tmp, sshkey_type(public));
1826
1827 /* Prepare certificate to sign */
1828 if ((r = sshkey_to_certified(public)) != 0)
1829 fatal_r(r, "Could not upgrade key %s to certificate", tmp);
1830 public->cert->type = cert_key_type;
1831 public->cert->serial = (u_int64_t)cert_serial;
1832 public->cert->key_id = xstrdup(cert_key_id);
1833 public->cert->nprincipals = n;
1834 public->cert->principals = plist;
1835 public->cert->valid_after = cert_valid_from;
1836 public->cert->valid_before = cert_valid_to;
1837 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1838 prepare_options_buf(public->cert->extensions,
1839 OPTIONS_EXTENSIONS);
1840 if ((r = sshkey_from_private(ca,
1841 &public->cert->signature_key)) != 0)
1842 fatal_r(r, "sshkey_from_private (ca key)");
1843
1844 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1845 if ((r = sshkey_certify_custom(public, ca,
1846 key_type_name, sk_provider, NULL, agent_signer,
1847 &agent_fd)) != 0)
1848 fatal_r(r, "Couldn't certify %s via agent", tmp);
1849 } else {
1850 if (sshkey_is_sk(ca) &&
1851 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
1852 notifier = notify_start(0,
1853 "Confirm user presence for key %s %s",
1854 sshkey_type(ca), ca_fp);
1855 }
1856 r = sshkey_certify(public, ca, key_type_name,
1857 sk_provider, pin);
1858 notify_complete(notifier, "User presence confirmed");
1859 if (r != 0)
1860 fatal_r(r, "Couldn't certify key %s", tmp);
1861 }
1862
1863 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1864 *cp = '\0';
1865 xasprintf(&out, "%s-cert.pub", tmp);
1866 free(tmp);
1867
1868 if ((r = sshkey_save_public(public, out, comment)) != 0) {
1869 fatal_r(r, "Unable to save public key to %s",
1870 identity_file);
1871 }
1872
1873 if (!quiet) {
1874 sshkey_format_cert_validity(public->cert,
1875 valid, sizeof(valid));
1876 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1877 "valid %s", sshkey_cert_type(public),
1878 out, public->cert->key_id,
1879 (unsigned long long)public->cert->serial,
1880 cert_principals != NULL ? " for " : "",
1881 cert_principals != NULL ? cert_principals : "",
1882 valid);
1883 }
1884
1885 sshkey_free(public);
1886 free(out);
1887 if (cert_serial_autoinc)
1888 cert_serial++;
1889 }
1890 if (pin != NULL)
1891 freezero(pin, strlen(pin));
1892 free(ca_fp);
1893 #ifdef ENABLE_PKCS11
1894 pkcs11_terminate();
1895 #endif
1896 exit(0);
1897 }
1898
1899 static u_int64_t
1900 parse_relative_time(const char *s, time_t now)
1901 {
1902 int64_t mul, secs;
1903
1904 mul = *s == '-' ? -1 : 1;
1905
1906 if ((secs = convtime(s + 1)) == -1)
1907 fatal("Invalid relative certificate time %s", s);
1908 if (mul == -1 && secs > now)
1909 fatal("Certificate time %s cannot be represented", s);
1910 return now + (u_int64_t)(secs * mul);
1911 }
1912
1913 static void
1914 parse_cert_times(char *timespec)
1915 {
1916 char *from, *to;
1917 time_t now = time(NULL);
1918 int64_t secs;
1919
1920 /* +timespec relative to now */
1921 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1922 if ((secs = convtime(timespec + 1)) == -1)
1923 fatal("Invalid relative certificate life %s", timespec);
1924 cert_valid_to = now + secs;
1925 /*
1926 * Backdate certificate one minute to avoid problems on hosts
1927 * with poorly-synchronised clocks.
1928 */
1929 cert_valid_from = ((now - 59)/ 60) * 60;
1930 return;
1931 }
1932
1933 /*
1934 * from:to, where
1935 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always"
1936 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever"
1937 */
1938 from = xstrdup(timespec);
1939 to = strchr(from, ':');
1940 if (to == NULL || from == to || *(to + 1) == '\0')
1941 fatal("Invalid certificate life specification %s", timespec);
1942 *to++ = '\0';
1943
1944 if (*from == '-' || *from == '+')
1945 cert_valid_from = parse_relative_time(from, now);
1946 else if (strcmp(from, "always") == 0)
1947 cert_valid_from = 0;
1948 else if (parse_absolute_time(from, &cert_valid_from) != 0)
1949 fatal("Invalid from time \"%s\"", from);
1950
1951 if (*to == '-' || *to == '+')
1952 cert_valid_to = parse_relative_time(to, now);
1953 else if (strcmp(to, "forever") == 0)
1954 cert_valid_to = ~(u_int64_t)0;
1955 else if (parse_absolute_time(to, &cert_valid_to) != 0)
1956 fatal("Invalid to time \"%s\"", to);
1957
1958 if (cert_valid_to <= cert_valid_from)
1959 fatal("Empty certificate validity interval");
1960 free(from);
1961 }
1962
1963 static void
1964 add_cert_option(char *opt)
1965 {
1966 char *val, *cp;
1967 int iscrit = 0;
1968
1969 if (strcasecmp(opt, "clear") == 0)
1970 certflags_flags = 0;
1971 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1972 certflags_flags &= ~CERTOPT_X_FWD;
1973 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1974 certflags_flags |= CERTOPT_X_FWD;
1975 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
1976 certflags_flags &= ~CERTOPT_AGENT_FWD;
1977 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
1978 certflags_flags |= CERTOPT_AGENT_FWD;
1979 else if (strcasecmp(opt, "no-port-forwarding") == 0)
1980 certflags_flags &= ~CERTOPT_PORT_FWD;
1981 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
1982 certflags_flags |= CERTOPT_PORT_FWD;
1983 else if (strcasecmp(opt, "no-pty") == 0)
1984 certflags_flags &= ~CERTOPT_PTY;
1985 else if (strcasecmp(opt, "permit-pty") == 0)
1986 certflags_flags |= CERTOPT_PTY;
1987 else if (strcasecmp(opt, "no-user-rc") == 0)
1988 certflags_flags &= ~CERTOPT_USER_RC;
1989 else if (strcasecmp(opt, "permit-user-rc") == 0)
1990 certflags_flags |= CERTOPT_USER_RC;
1991 else if (strcasecmp(opt, "touch-required") == 0)
1992 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE;
1993 else if (strcasecmp(opt, "no-touch-required") == 0)
1994 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE;
1995 else if (strncasecmp(opt, "force-command=", 14) == 0) {
1996 val = opt + 14;
1997 if (*val == '\0')
1998 fatal("Empty force-command option");
1999 if (certflags_command != NULL)
2000 fatal("force-command already specified");
2001 certflags_command = xstrdup(val);
2002 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
2003 val = opt + 15;
2004 if (*val == '\0')
2005 fatal("Empty source-address option");
2006 if (certflags_src_addr != NULL)
2007 fatal("source-address already specified");
2008 if (addr_match_cidr_list(NULL, val) != 0)
2009 fatal("Invalid source-address list");
2010 certflags_src_addr = xstrdup(val);
2011 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
2012 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
2013 val = xstrdup(strchr(opt, ':') + 1);
2014 if ((cp = strchr(val, '=')) != NULL)
2015 *cp++ = '\0';
2016 cert_ext_add(val, cp, iscrit);
2017 free(val);
2018 } else
2019 fatal("Unsupported certificate option \"%s\"", opt);
2020 }
2021
2022 static void
2023 show_options(struct sshbuf *optbuf, int in_critical)
2024 {
2025 char *name, *arg, *hex;
2026 struct sshbuf *options, *option = NULL;
2027 int r;
2028
2029 if ((options = sshbuf_fromb(optbuf)) == NULL)
2030 fatal_f("sshbuf_fromb failed");
2031 while (sshbuf_len(options) != 0) {
2032 sshbuf_free(option);
2033 option = NULL;
2034 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
2035 (r = sshbuf_froms(options, &option)) != 0)
2036 fatal_fr(r, "parse option");
2037 printf(" %s", name);
2038 if (!in_critical &&
2039 (strcmp(name, "permit-X11-forwarding") == 0 ||
2040 strcmp(name, "permit-agent-forwarding") == 0 ||
2041 strcmp(name, "permit-port-forwarding") == 0 ||
2042 strcmp(name, "permit-pty") == 0 ||
2043 strcmp(name, "permit-user-rc") == 0 ||
2044 strcmp(name, "no-touch-required") == 0)) {
2045 printf("\n");
2046 } else if (in_critical &&
2047 (strcmp(name, "force-command") == 0 ||
2048 strcmp(name, "source-address") == 0)) {
2049 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
2050 fatal_fr(r, "parse critical");
2051 printf(" %s\n", arg);
2052 free(arg);
2053 } else if (sshbuf_len(option) > 0) {
2054 hex = sshbuf_dtob16(option);
2055 printf(" UNKNOWN OPTION: %s (len %zu)\n",
2056 hex, sshbuf_len(option));
2057 sshbuf_reset(option);
2058 free(hex);
2059 } else
2060 printf(" UNKNOWN FLAG OPTION\n");
2061 free(name);
2062 if (sshbuf_len(option) != 0)
2063 fatal("Option corrupt: extra data at end");
2064 }
2065 sshbuf_free(option);
2066 sshbuf_free(options);
2067 }
2068
2069 static void
2070 print_cert(struct sshkey *key)
2071 {
2072 char valid[64], *key_fp, *ca_fp;
2073 u_int i;
2074
2075 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2076 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2077 fingerprint_hash, SSH_FP_DEFAULT);
2078 if (key_fp == NULL || ca_fp == NULL)
2079 fatal_f("sshkey_fingerprint fail");
2080 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2081
2082 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2083 sshkey_cert_type(key));
2084 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2085 printf(" Signing CA: %s %s (using %s)\n",
2086 sshkey_type(key->cert->signature_key), ca_fp,
2087 key->cert->signature_type);
2088 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2089 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2090 printf(" Valid: %s\n", valid);
2091 printf(" Principals: ");
2092 if (key->cert->nprincipals == 0)
2093 printf("(none)\n");
2094 else {
2095 for (i = 0; i < key->cert->nprincipals; i++)
2096 printf("\n %s",
2097 key->cert->principals[i]);
2098 printf("\n");
2099 }
2100 printf(" Critical Options: ");
2101 if (sshbuf_len(key->cert->critical) == 0)
2102 printf("(none)\n");
2103 else {
2104 printf("\n");
2105 show_options(key->cert->critical, 1);
2106 }
2107 printf(" Extensions: ");
2108 if (sshbuf_len(key->cert->extensions) == 0)
2109 printf("(none)\n");
2110 else {
2111 printf("\n");
2112 show_options(key->cert->extensions, 0);
2113 }
2114 }
2115
2116 static void
2117 do_show_cert(struct passwd *pw)
2118 {
2119 struct sshkey *key = NULL;
2120 struct stat st;
2121 int r, is_stdin = 0, ok = 0;
2122 FILE *f;
2123 char *cp, *line = NULL;
2124 const char *path;
2125 size_t linesize = 0;
2126 u_long lnum = 0;
2127
2128 if (!have_identity)
2129 ask_filename(pw, "Enter file in which the key is");
2130 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1)
2131 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2132
2133 path = identity_file;
2134 if (strcmp(path, "-") == 0) {
2135 f = stdin;
2136 path = "(stdin)";
2137 is_stdin = 1;
2138 } else if ((f = fopen(identity_file, "r")) == NULL)
2139 fatal("fopen %s: %s", identity_file, strerror(errno));
2140
2141 while (getline(&line, &linesize, f) != -1) {
2142 lnum++;
2143 sshkey_free(key);
2144 key = NULL;
2145 /* Trim leading space and comments */
2146 cp = line + strspn(line, " \t");
2147 if (*cp == '#' || *cp == '\0')
2148 continue;
2149 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2150 fatal("sshkey_new");
2151 if ((r = sshkey_read(key, &cp)) != 0) {
2152 error_r(r, "%s:%lu: invalid key", path, lnum);
2153 continue;
2154 }
2155 if (!sshkey_is_cert(key)) {
2156 error("%s:%lu is not a certificate", path, lnum);
2157 continue;
2158 }
2159 ok = 1;
2160 if (!is_stdin && lnum == 1)
2161 printf("%s:\n", path);
2162 else
2163 printf("%s:%lu:\n", path, lnum);
2164 print_cert(key);
2165 }
2166 free(line);
2167 sshkey_free(key);
2168 fclose(f);
2169 exit(ok ? 0 : 1);
2170 }
2171
2172 static void
2173 load_krl(const char *path, struct ssh_krl **krlp)
2174 {
2175 struct sshbuf *krlbuf;
2176 int r;
2177
2178 if ((r = sshbuf_load_file(path, &krlbuf)) != 0)
2179 fatal_r(r, "Unable to load KRL %s", path);
2180 /* XXX check sigs */
2181 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 ||
2182 *krlp == NULL)
2183 fatal_r(r, "Invalid KRL file %s", path);
2184 sshbuf_free(krlbuf);
2185 }
2186
2187 static void
2188 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp,
2189 const char *file, u_long lnum)
2190 {
2191 char *tmp;
2192 size_t tlen;
2193 struct sshbuf *b;
2194 int r;
2195
2196 if (strncmp(cp, "SHA256:", 7) != 0)
2197 fatal("%s:%lu: unsupported hash algorithm", file, lnum);
2198 cp += 7;
2199
2200 /*
2201 * OpenSSH base64 hashes omit trailing '='
2202 * characters; put them back for decode.
2203 */
2204 tlen = strlen(cp);
2205 tmp = xmalloc(tlen + 4 + 1);
2206 strlcpy(tmp, cp, tlen + 1);
2207 while ((tlen % 4) != 0) {
2208 tmp[tlen++] = '=';
2209 tmp[tlen] = '\0';
2210 }
2211 if ((b = sshbuf_new()) == NULL)
2212 fatal_f("sshbuf_new failed");
2213 if ((r = sshbuf_b64tod(b, tmp)) != 0)
2214 fatal_r(r, "%s:%lu: decode hash failed", file, lnum);
2215 free(tmp);
2216 *lenp = sshbuf_len(b);
2217 *blobp = xmalloc(*lenp);
2218 memcpy(*blobp, sshbuf_ptr(b), *lenp);
2219 sshbuf_free(b);
2220 }
2221
2222 static void
2223 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2224 const struct sshkey *ca, struct ssh_krl *krl)
2225 {
2226 struct sshkey *key = NULL;
2227 u_long lnum = 0;
2228 char *path, *cp, *ep, *line = NULL;
2229 u_char *blob = NULL;
2230 size_t blen = 0, linesize = 0;
2231 unsigned long long serial, serial2;
2232 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r;
2233 FILE *krl_spec;
2234
2235 path = tilde_expand_filename(file, pw->pw_uid);
2236 if (strcmp(path, "-") == 0) {
2237 krl_spec = stdin;
2238 free(path);
2239 path = xstrdup("(standard input)");
2240 } else if ((krl_spec = fopen(path, "r")) == NULL)
2241 fatal("fopen %s: %s", path, strerror(errno));
2242
2243 if (!quiet)
2244 printf("Revoking from %s\n", path);
2245 while (getline(&line, &linesize, krl_spec) != -1) {
2246 lnum++;
2247 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0;
2248 cp = line + strspn(line, " \t");
2249 /* Trim trailing space, comments and strip \n */
2250 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2251 if (cp[i] == '#' || cp[i] == '\n') {
2252 cp[i] = '\0';
2253 break;
2254 }
2255 if (cp[i] == ' ' || cp[i] == '\t') {
2256 /* Remember the start of a span of whitespace */
2257 if (r == -1)
2258 r = i;
2259 } else
2260 r = -1;
2261 }
2262 if (r != -1)
2263 cp[r] = '\0';
2264 if (*cp == '\0')
2265 continue;
2266 if (strncasecmp(cp, "serial:", 7) == 0) {
2267 if (ca == NULL && !wild_ca) {
2268 fatal("revoking certificates by serial number "
2269 "requires specification of a CA key");
2270 }
2271 cp += 7;
2272 cp = cp + strspn(cp, " \t");
2273 errno = 0;
2274 serial = strtoull(cp, &ep, 0);
2275 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2276 fatal("%s:%lu: invalid serial \"%s\"",
2277 path, lnum, cp);
2278 if (errno == ERANGE && serial == ULLONG_MAX)
2279 fatal("%s:%lu: serial out of range",
2280 path, lnum);
2281 serial2 = serial;
2282 if (*ep == '-') {
2283 cp = ep + 1;
2284 errno = 0;
2285 serial2 = strtoull(cp, &ep, 0);
2286 if (*cp == '\0' || *ep != '\0')
2287 fatal("%s:%lu: invalid serial \"%s\"",
2288 path, lnum, cp);
2289 if (errno == ERANGE && serial2 == ULLONG_MAX)
2290 fatal("%s:%lu: serial out of range",
2291 path, lnum);
2292 if (serial2 <= serial)
2293 fatal("%s:%lu: invalid serial range "
2294 "%llu:%llu", path, lnum,
2295 (unsigned long long)serial,
2296 (unsigned long long)serial2);
2297 }
2298 if (ssh_krl_revoke_cert_by_serial_range(krl,
2299 ca, serial, serial2) != 0) {
2300 fatal_f("revoke serial failed");
2301 }
2302 } else if (strncasecmp(cp, "id:", 3) == 0) {
2303 if (ca == NULL && !wild_ca) {
2304 fatal("revoking certificates by key ID "
2305 "requires specification of a CA key");
2306 }
2307 cp += 3;
2308 cp = cp + strspn(cp, " \t");
2309 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2310 fatal_f("revoke key ID failed");
2311 } else if (strncasecmp(cp, "hash:", 5) == 0) {
2312 cp += 5;
2313 cp = cp + strspn(cp, " \t");
2314 hash_to_blob(cp, &blob, &blen, file, lnum);
2315 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2316 if (r != 0)
2317 fatal_fr(r, "revoke key failed");
2318 } else {
2319 if (strncasecmp(cp, "key:", 4) == 0) {
2320 cp += 4;
2321 cp = cp + strspn(cp, " \t");
2322 was_explicit_key = 1;
2323 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2324 cp += 5;
2325 cp = cp + strspn(cp, " \t");
2326 was_sha1 = 1;
2327 } else if (strncasecmp(cp, "sha256:", 7) == 0) {
2328 cp += 7;
2329 cp = cp + strspn(cp, " \t");
2330 was_sha256 = 1;
2331 /*
2332 * Just try to process the line as a key.
2333 * Parsing will fail if it isn't.
2334 */
2335 }
2336 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2337 fatal("sshkey_new");
2338 if ((r = sshkey_read(key, &cp)) != 0)
2339 fatal_r(r, "%s:%lu: invalid key", path, lnum);
2340 if (was_explicit_key)
2341 r = ssh_krl_revoke_key_explicit(krl, key);
2342 else if (was_sha1) {
2343 if (sshkey_fingerprint_raw(key,
2344 SSH_DIGEST_SHA1, &blob, &blen) != 0) {
2345 fatal("%s:%lu: fingerprint failed",
2346 file, lnum);
2347 }
2348 r = ssh_krl_revoke_key_sha1(krl, blob, blen);
2349 } else if (was_sha256) {
2350 if (sshkey_fingerprint_raw(key,
2351 SSH_DIGEST_SHA256, &blob, &blen) != 0) {
2352 fatal("%s:%lu: fingerprint failed",
2353 file, lnum);
2354 }
2355 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2356 } else
2357 r = ssh_krl_revoke_key(krl, key);
2358 if (r != 0)
2359 fatal_fr(r, "revoke key failed");
2360 freezero(blob, blen);
2361 blob = NULL;
2362 blen = 0;
2363 sshkey_free(key);
2364 }
2365 }
2366 if (strcmp(path, "-") != 0)
2367 fclose(krl_spec);
2368 free(line);
2369 free(path);
2370 }
2371
2372 static void
2373 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path,
2374 unsigned long long krl_version, const char *krl_comment,
2375 int argc, char **argv)
2376 {
2377 struct ssh_krl *krl;
2378 struct stat sb;
2379 struct sshkey *ca = NULL;
2380 int i, r, wild_ca = 0;
2381 char *tmp;
2382 struct sshbuf *kbuf;
2383
2384 if (*identity_file == '\0')
2385 fatal("KRL generation requires an output file");
2386 if (stat(identity_file, &sb) == -1) {
2387 if (errno != ENOENT)
2388 fatal("Cannot access KRL \"%s\": %s",
2389 identity_file, strerror(errno));
2390 if (updating)
2391 fatal("KRL \"%s\" does not exist", identity_file);
2392 }
2393 if (ca_key_path != NULL) {
2394 if (strcasecmp(ca_key_path, "none") == 0)
2395 wild_ca = 1;
2396 else {
2397 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2398 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2399 fatal_r(r, "Cannot load CA public key %s", tmp);
2400 free(tmp);
2401 }
2402 }
2403
2404 if (updating)
2405 load_krl(identity_file, &krl);
2406 else if ((krl = ssh_krl_init()) == NULL)
2407 fatal("couldn't create KRL");
2408
2409 if (krl_version != 0)
2410 ssh_krl_set_version(krl, krl_version);
2411 if (krl_comment != NULL)
2412 ssh_krl_set_comment(krl, krl_comment);
2413
2414 for (i = 0; i < argc; i++)
2415 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2416
2417 if ((kbuf = sshbuf_new()) == NULL)
2418 fatal("sshbuf_new failed");
2419 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0)
2420 fatal("Couldn't generate KRL");
2421 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0)
2422 fatal("write %s: %s", identity_file, strerror(errno));
2423 sshbuf_free(kbuf);
2424 ssh_krl_free(krl);
2425 sshkey_free(ca);
2426 }
2427
2428 static void
2429 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv)
2430 {
2431 int i, r, ret = 0;
2432 char *comment;
2433 struct ssh_krl *krl;
2434 struct sshkey *k;
2435
2436 if (*identity_file == '\0')
2437 fatal("KRL checking requires an input file");
2438 load_krl(identity_file, &krl);
2439 if (print_krl)
2440 krl_dump(krl, stdout);
2441 for (i = 0; i < argc; i++) {
2442 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2443 fatal_r(r, "Cannot load public key %s", argv[i]);
2444 r = ssh_krl_check_key(krl, k);
2445 printf("%s%s%s%s: %s\n", argv[i],
2446 *comment ? " (" : "", comment, *comment ? ")" : "",
2447 r == 0 ? "ok" : "REVOKED");
2448 if (r != 0)
2449 ret = 1;
2450 sshkey_free(k);
2451 free(comment);
2452 }
2453 ssh_krl_free(krl);
2454 exit(ret);
2455 }
2456
2457 static struct sshkey *
2458 load_sign_key(const char *keypath, const struct sshkey *pubkey)
2459 {
2460 size_t i, slen, plen = strlen(keypath);
2461 char *privpath = xstrdup(keypath);
2462 const char *suffixes[] = { "-cert.pub", ".pub", NULL };
2463 struct sshkey *ret = NULL, *privkey = NULL;
2464 int r;
2465
2466 /*
2467 * If passed a public key filename, then try to locate the corresponding
2468 * private key. This lets us specify certificates on the command-line
2469 * and have ssh-keygen find the appropriate private key.
2470 */
2471 for (i = 0; suffixes[i]; i++) {
2472 slen = strlen(suffixes[i]);
2473 if (plen <= slen ||
2474 strcmp(privpath + plen - slen, suffixes[i]) != 0)
2475 continue;
2476 privpath[plen - slen] = '\0';
2477 debug_f("%s looks like a public key, using private key "
2478 "path %s instead", keypath, privpath);
2479 }
2480 if ((privkey = load_identity(privpath, NULL)) == NULL) {
2481 error("Couldn't load identity %s", keypath);
2482 goto done;
2483 }
2484 if (!sshkey_equal_public(pubkey, privkey)) {
2485 error("Public key %s doesn't match private %s",
2486 keypath, privpath);
2487 goto done;
2488 }
2489 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) {
2490 /*
2491 * Graft the certificate onto the private key to make
2492 * it capable of signing.
2493 */
2494 if ((r = sshkey_to_certified(privkey)) != 0) {
2495 error_fr(r, "sshkey_to_certified");
2496 goto done;
2497 }
2498 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) {
2499 error_fr(r, "sshkey_cert_copy");
2500 goto done;
2501 }
2502 }
2503 /* success */
2504 ret = privkey;
2505 privkey = NULL;
2506 done:
2507 sshkey_free(privkey);
2508 free(privpath);
2509 return ret;
2510 }
2511
2512 static int
2513 sign_one(struct sshkey *signkey, const char *filename, int fd,
2514 const char *sig_namespace, sshsig_signer *signer, void *signer_ctx)
2515 {
2516 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2517 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno;
2518 char *wfile = NULL, *asig = NULL, *fp = NULL;
2519 char *pin = NULL, *prompt = NULL;
2520
2521 if (!quiet) {
2522 if (fd == STDIN_FILENO)
2523 fprintf(stderr, "Signing data on standard input\n");
2524 else
2525 fprintf(stderr, "Signing file %s\n", filename);
2526 }
2527 if (signer == NULL && sshkey_is_sk(signkey)) {
2528 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
2529 xasprintf(&prompt, "Enter PIN for %s key: ",
2530 sshkey_type(signkey));
2531 if ((pin = read_passphrase(prompt,
2532 RP_ALLOW_STDIN)) == NULL)
2533 fatal_f("couldn't read PIN");
2534 }
2535 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
2536 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash,
2537 SSH_FP_DEFAULT)) == NULL)
2538 fatal_f("fingerprint failed");
2539 fprintf(stderr, "Confirm user presence for key %s %s\n",
2540 sshkey_type(signkey), fp);
2541 free(fp);
2542 }
2543 }
2544 if ((r = sshsig_sign_fd(signkey, NULL, sk_provider, pin,
2545 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) {
2546 error_r(r, "Signing %s failed", filename);
2547 goto out;
2548 }
2549 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) {
2550 error_fr(r, "sshsig_armor");
2551 goto out;
2552 }
2553 if ((asig = sshbuf_dup_string(abuf)) == NULL) {
2554 error_f("buffer error");
2555 r = SSH_ERR_ALLOC_FAIL;
2556 goto out;
2557 }
2558
2559 if (fd == STDIN_FILENO) {
2560 fputs(asig, stdout);
2561 fflush(stdout);
2562 } else {
2563 xasprintf(&wfile, "%s.sig", filename);
2564 if (confirm_overwrite(wfile)) {
2565 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC,
2566 0666)) == -1) {
2567 oerrno = errno;
2568 error("Cannot open %s: %s",
2569 wfile, strerror(errno));
2570 errno = oerrno;
2571 r = SSH_ERR_SYSTEM_ERROR;
2572 goto out;
2573 }
2574 if (atomicio(vwrite, wfd, asig,
2575 strlen(asig)) != strlen(asig)) {
2576 oerrno = errno;
2577 error("Cannot write to %s: %s",
2578 wfile, strerror(errno));
2579 errno = oerrno;
2580 r = SSH_ERR_SYSTEM_ERROR;
2581 goto out;
2582 }
2583 if (!quiet) {
2584 fprintf(stderr, "Write signature to %s\n",
2585 wfile);
2586 }
2587 }
2588 }
2589 /* success */
2590 r = 0;
2591 out:
2592 free(wfile);
2593 free(prompt);
2594 free(asig);
2595 if (pin != NULL)
2596 freezero(pin, strlen(pin));
2597 sshbuf_free(abuf);
2598 sshbuf_free(sigbuf);
2599 if (wfd != -1)
2600 close(wfd);
2601 return r;
2602 }
2603
2604 static int
2605 sig_sign(const char *keypath, const char *sig_namespace, int argc, char **argv)
2606 {
2607 int i, fd = -1, r, ret = -1;
2608 int agent_fd = -1;
2609 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL;
2610 sshsig_signer *signer = NULL;
2611
2612 /* Check file arguments. */
2613 for (i = 0; i < argc; i++) {
2614 if (strcmp(argv[i], "-") != 0)
2615 continue;
2616 if (i > 0 || argc > 1)
2617 fatal("Cannot sign mix of paths and standard input");
2618 }
2619
2620 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) {
2621 error_r(r, "Couldn't load public key %s", keypath);
2622 goto done;
2623 }
2624
2625 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
2626 debug_r(r, "Couldn't get agent socket");
2627 else {
2628 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0)
2629 signer = agent_signer;
2630 else
2631 debug_r(r, "Couldn't find key in agent");
2632 }
2633
2634 if (signer == NULL) {
2635 /* Not using agent - try to load private key */
2636 if ((privkey = load_sign_key(keypath, pubkey)) == NULL)
2637 goto done;
2638 signkey = privkey;
2639 } else {
2640 /* Will use key in agent */
2641 signkey = pubkey;
2642 }
2643
2644 if (argc == 0) {
2645 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO,
2646 sig_namespace, signer, &agent_fd)) != 0)
2647 goto done;
2648 } else {
2649 for (i = 0; i < argc; i++) {
2650 if (strcmp(argv[i], "-") == 0)
2651 fd = STDIN_FILENO;
2652 else if ((fd = open(argv[i], O_RDONLY)) == -1) {
2653 error("Cannot open %s for signing: %s",
2654 argv[i], strerror(errno));
2655 goto done;
2656 }
2657 if ((r = sign_one(signkey, argv[i], fd, sig_namespace,
2658 signer, &agent_fd)) != 0)
2659 goto done;
2660 if (fd != STDIN_FILENO)
2661 close(fd);
2662 fd = -1;
2663 }
2664 }
2665
2666 ret = 0;
2667 done:
2668 if (fd != -1 && fd != STDIN_FILENO)
2669 close(fd);
2670 sshkey_free(pubkey);
2671 sshkey_free(privkey);
2672 return ret;
2673 }
2674
2675 static int
2676 sig_process_opts(char * const *opts, size_t nopts, uint64_t *verify_timep,
2677 int *print_pubkey)
2678 {
2679 size_t i;
2680 time_t now;
2681
2682 *verify_timep = 0;
2683 if (print_pubkey != NULL)
2684 *print_pubkey = 0;
2685 for (i = 0; i < nopts; i++) {
2686 if (strncasecmp(opts[i], "verify-time=", 12) == 0) {
2687 if (parse_absolute_time(opts[i] + 12,
2688 verify_timep) != 0 || *verify_timep == 0) {
2689 error("Invalid \"verify-time\" option");
2690 return SSH_ERR_INVALID_ARGUMENT;
2691 }
2692 } else if (print_pubkey &&
2693 strcasecmp(opts[i], "print-pubkey") == 0) {
2694 *print_pubkey = 1;
2695 } else {
2696 error("Invalid option \"%s\"", opts[i]);
2697 return SSH_ERR_INVALID_ARGUMENT;
2698 }
2699 }
2700 if (*verify_timep == 0) {
2701 if ((now = time(NULL)) < 0) {
2702 error("Time is before epoch");
2703 return SSH_ERR_INVALID_ARGUMENT;
2704 }
2705 *verify_timep = (uint64_t)now;
2706 }
2707 return 0;
2708 }
2709
2710 static int
2711 sig_verify(const char *signature, const char *sig_namespace,
2712 const char *principal, const char *allowed_keys, const char *revoked_keys,
2713 char * const *opts, size_t nopts)
2714 {
2715 int r, ret = -1;
2716 int print_pubkey = 0;
2717 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2718 struct sshkey *sign_key = NULL;
2719 char *fp = NULL;
2720 struct sshkey_sig_details *sig_details = NULL;
2721 uint64_t verify_time = 0;
2722
2723 if (sig_process_opts(opts, nopts, &verify_time, &print_pubkey) != 0)
2724 goto done; /* error already logged */
2725
2726 memset(&sig_details, 0, sizeof(sig_details));
2727 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2728 error_r(r, "Couldn't read signature file");
2729 goto done;
2730 }
2731
2732 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2733 error_fr(r, "sshsig_armor");
2734 goto done;
2735 }
2736 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace,
2737 &sign_key, &sig_details)) != 0)
2738 goto done; /* sshsig_verify() prints error */
2739
2740 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2741 SSH_FP_DEFAULT)) == NULL)
2742 fatal_f("sshkey_fingerprint failed");
2743 debug("Valid (unverified) signature from key %s", fp);
2744 if (sig_details != NULL) {
2745 debug2_f("signature details: counter = %u, flags = 0x%02x",
2746 sig_details->sk_counter, sig_details->sk_flags);
2747 }
2748 free(fp);
2749 fp = NULL;
2750
2751 if (revoked_keys != NULL) {
2752 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
2753 debug3_fr(r, "sshkey_check_revoked");
2754 goto done;
2755 }
2756 }
2757
2758 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys,
2759 sign_key, principal, sig_namespace, verify_time)) != 0) {
2760 debug3_fr(r, "sshsig_check_allowed_keys");
2761 goto done;
2762 }
2763 /* success */
2764 ret = 0;
2765 done:
2766 if (!quiet) {
2767 if (ret == 0) {
2768 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2769 SSH_FP_DEFAULT)) == NULL)
2770 fatal_f("sshkey_fingerprint failed");
2771 if (principal == NULL) {
2772 printf("Good \"%s\" signature with %s key %s\n",
2773 sig_namespace, sshkey_type(sign_key), fp);
2774
2775 } else {
2776 printf("Good \"%s\" signature for %s with %s key %s\n",
2777 sig_namespace, principal,
2778 sshkey_type(sign_key), fp);
2779 }
2780 } else {
2781 printf("Could not verify signature.\n");
2782 }
2783 }
2784 /* Print the signature key if requested */
2785 if (ret == 0 && print_pubkey && sign_key != NULL) {
2786 if ((r = sshkey_write(sign_key, stdout)) == 0)
2787 fputc('\n', stdout);
2788 else {
2789 error_r(r, "Could not print public key.\n");
2790 ret = -1;
2791 }
2792 }
2793 sshbuf_free(sigbuf);
2794 sshbuf_free(abuf);
2795 sshkey_free(sign_key);
2796 sshkey_sig_details_free(sig_details);
2797 free(fp);
2798 return ret;
2799 }
2800
2801 static int
2802 sig_find_principals(const char *signature, const char *allowed_keys,
2803 char * const *opts, size_t nopts)
2804 {
2805 int r, ret = -1;
2806 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2807 struct sshkey *sign_key = NULL;
2808 char *principals = NULL, *cp, *tmp;
2809 uint64_t verify_time = 0;
2810
2811 if (sig_process_opts(opts, nopts, &verify_time, NULL) != 0)
2812 goto done; /* error already logged */
2813
2814 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2815 error_r(r, "Couldn't read signature file");
2816 goto done;
2817 }
2818 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2819 error_fr(r, "sshsig_armor");
2820 goto done;
2821 }
2822 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) {
2823 error_fr(r, "sshsig_get_pubkey");
2824 goto done;
2825 }
2826 if ((r = sshsig_find_principals(allowed_keys, sign_key,
2827 verify_time, &principals)) != 0) {
2828 if (r != SSH_ERR_KEY_NOT_FOUND)
2829 error_fr(r, "sshsig_find_principal");
2830 goto done;
2831 }
2832 ret = 0;
2833 done:
2834 if (ret == 0 ) {
2835 /* Emit matching principals one per line */
2836 tmp = principals;
2837 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0')
2838 puts(cp);
2839 } else {
2840 fprintf(stderr, "No principal matched.\n");
2841 }
2842 sshbuf_free(sigbuf);
2843 sshbuf_free(abuf);
2844 sshkey_free(sign_key);
2845 free(principals);
2846 return ret;
2847 }
2848
2849 static void
2850 do_moduli_gen(const char *out_file, char **opts, size_t nopts)
2851 {
2852 #ifdef WITH_OPENSSL
2853 /* Moduli generation/screening */
2854 u_int32_t memory = 0;
2855 BIGNUM *start = NULL;
2856 int moduli_bits = 0;
2857 FILE *out;
2858 size_t i;
2859 const char *errstr;
2860
2861 /* Parse options */
2862 for (i = 0; i < nopts; i++) {
2863 if (strncmp(opts[i], "memory=", 7) == 0) {
2864 memory = (u_int32_t)strtonum(opts[i]+7, 1,
2865 UINT_MAX, &errstr);
2866 if (errstr) {
2867 fatal("Memory limit is %s: %s",
2868 errstr, opts[i]+7);
2869 }
2870 } else if (strncmp(opts[i], "start=", 6) == 0) {
2871 /* XXX - also compare length against bits */
2872 if (BN_hex2bn(&start, opts[i]+6) == 0)
2873 fatal("Invalid start point.");
2874 } else if (strncmp(opts[i], "bits=", 5) == 0) {
2875 moduli_bits = (int)strtonum(opts[i]+5, 1,
2876 INT_MAX, &errstr);
2877 if (errstr) {
2878 fatal("Invalid number: %s (%s)",
2879 opts[i]+12, errstr);
2880 }
2881 } else {
2882 fatal("Option \"%s\" is unsupported for moduli "
2883 "generation", opts[i]);
2884 }
2885 }
2886
2887 if ((out = fopen(out_file, "w")) == NULL) {
2888 fatal("Couldn't open modulus candidate file \"%s\": %s",
2889 out_file, strerror(errno));
2890 }
2891 setvbuf(out, NULL, _IOLBF, 0);
2892
2893 if (moduli_bits == 0)
2894 moduli_bits = DEFAULT_BITS;
2895 if (gen_candidates(out, memory, moduli_bits, start) != 0)
2896 fatal("modulus candidate generation failed");
2897 #else /* WITH_OPENSSL */
2898 fatal("Moduli generation is not supported");
2899 #endif /* WITH_OPENSSL */
2900 }
2901
2902 static void
2903 do_moduli_screen(const char *out_file, char **opts, size_t nopts)
2904 {
2905 #ifdef WITH_OPENSSL
2906 /* Moduli generation/screening */
2907 char *checkpoint = NULL;
2908 u_int32_t generator_wanted = 0;
2909 unsigned long start_lineno = 0, lines_to_process = 0;
2910 int prime_tests = 0;
2911 FILE *out, *in = stdin;
2912 size_t i;
2913 const char *errstr;
2914
2915 /* Parse options */
2916 for (i = 0; i < nopts; i++) {
2917 if (strncmp(opts[i], "lines=", 6) == 0) {
2918 lines_to_process = strtoul(opts[i]+6, NULL, 10);
2919 } else if (strncmp(opts[i], "start-line=", 11) == 0) {
2920 start_lineno = strtoul(opts[i]+11, NULL, 10);
2921 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) {
2922 checkpoint = xstrdup(opts[i]+11);
2923 } else if (strncmp(opts[i], "generator=", 10) == 0) {
2924 generator_wanted = (u_int32_t)strtonum(
2925 opts[i]+10, 1, UINT_MAX, &errstr);
2926 if (errstr != NULL) {
2927 fatal("Generator invalid: %s (%s)",
2928 opts[i]+10, errstr);
2929 }
2930 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) {
2931 prime_tests = (int)strtonum(opts[i]+12, 1,
2932 INT_MAX, &errstr);
2933 if (errstr) {
2934 fatal("Invalid number: %s (%s)",
2935 opts[i]+12, errstr);
2936 }
2937 } else {
2938 fatal("Option \"%s\" is unsupported for moduli "
2939 "screening", opts[i]);
2940 }
2941 }
2942
2943 if (have_identity && strcmp(identity_file, "-") != 0) {
2944 if ((in = fopen(identity_file, "r")) == NULL) {
2945 fatal("Couldn't open modulus candidate "
2946 "file \"%s\": %s", identity_file,
2947 strerror(errno));
2948 }
2949 }
2950
2951 if ((out = fopen(out_file, "a")) == NULL) {
2952 fatal("Couldn't open moduli file \"%s\": %s",
2953 out_file, strerror(errno));
2954 }
2955 setvbuf(out, NULL, _IOLBF, 0);
2956 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests,
2957 generator_wanted, checkpoint,
2958 start_lineno, lines_to_process) != 0)
2959 fatal("modulus screening failed");
2960 #else /* WITH_OPENSSL */
2961 fatal("Moduli screening is not supported");
2962 #endif /* WITH_OPENSSL */
2963 }
2964
2965 static char *
2966 private_key_passphrase(void)
2967 {
2968 char *passphrase1, *passphrase2;
2969
2970 /* Ask for a passphrase (twice). */
2971 if (identity_passphrase)
2972 passphrase1 = xstrdup(identity_passphrase);
2973 else if (identity_new_passphrase)
2974 passphrase1 = xstrdup(identity_new_passphrase);
2975 else {
2976 passphrase_again:
2977 passphrase1 =
2978 read_passphrase("Enter passphrase (empty for no "
2979 "passphrase): ", RP_ALLOW_STDIN);
2980 passphrase2 = read_passphrase("Enter same passphrase again: ",
2981 RP_ALLOW_STDIN);
2982 if (strcmp(passphrase1, passphrase2) != 0) {
2983 /*
2984 * The passphrases do not match. Clear them and
2985 * retry.
2986 */
2987 freezero(passphrase1, strlen(passphrase1));
2988 freezero(passphrase2, strlen(passphrase2));
2989 printf("Passphrases do not match. Try again.\n");
2990 goto passphrase_again;
2991 }
2992 /* Clear the other copy of the passphrase. */
2993 freezero(passphrase2, strlen(passphrase2));
2994 }
2995 return passphrase1;
2996 }
2997
2998 static const char *
2999 skip_ssh_url_preamble(const char *s)
3000 {
3001 if (strncmp(s, "ssh://", 6) == 0)
3002 return s + 6;
3003 else if (strncmp(s, "ssh:", 4) == 0)
3004 return s + 4;
3005 return s;
3006 }
3007
3008 static int
3009 do_download_sk(const char *skprovider, const char *device)
3010 {
3011 struct sshkey **keys;
3012 size_t nkeys, i;
3013 int r, ret = -1;
3014 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath;
3015 const char *ext;
3016
3017 if (skprovider == NULL)
3018 fatal("Cannot download keys without provider");
3019
3020 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN);
3021 if (!quiet) {
3022 printf("You may need to touch your authenticator "
3023 "to authorize key download.\n");
3024 }
3025 if ((r = sshsk_load_resident(skprovider, device, pin,
3026 &keys, &nkeys)) != 0) {
3027 if (pin != NULL)
3028 freezero(pin, strlen(pin));
3029 error_r(r, "Unable to load resident keys");
3030 return -1;
3031 }
3032 if (nkeys == 0)
3033 logit("No keys to download");
3034 if (pin != NULL)
3035 freezero(pin, strlen(pin));
3036
3037 for (i = 0; i < nkeys; i++) {
3038 if (keys[i]->type != KEY_ECDSA_SK &&
3039 keys[i]->type != KEY_ED25519_SK) {
3040 error("Unsupported key type %s (%d)",
3041 sshkey_type(keys[i]), keys[i]->type);
3042 continue;
3043 }
3044 if ((fp = sshkey_fingerprint(keys[i],
3045 fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
3046 fatal_f("sshkey_fingerprint failed");
3047 debug_f("key %zu: %s %s %s (flags 0x%02x)", i,
3048 sshkey_type(keys[i]), fp, keys[i]->sk_application,
3049 keys[i]->sk_flags);
3050 ext = skip_ssh_url_preamble(keys[i]->sk_application);
3051 xasprintf(&path, "id_%s_rk%s%s",
3052 keys[i]->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk",
3053 *ext == '\0' ? "" : "_", ext);
3054
3055 /* If the file already exists, ask the user to confirm. */
3056 if (!confirm_overwrite(path)) {
3057 free(path);
3058 break;
3059 }
3060
3061 /* Save the key with the application string as the comment */
3062 if (pass == NULL)
3063 pass = private_key_passphrase();
3064 if ((r = sshkey_save_private(keys[i], path, pass,
3065 keys[i]->sk_application, private_key_format,
3066 openssh_format_cipher, rounds)) != 0) {
3067 error_r(r, "Saving key \"%s\" failed", path);
3068 free(path);
3069 break;
3070 }
3071 if (!quiet) {
3072 printf("Saved %s key%s%s to %s\n",
3073 sshkey_type(keys[i]),
3074 *ext != '\0' ? " " : "",
3075 *ext != '\0' ? keys[i]->sk_application : "",
3076 path);
3077 }
3078
3079 /* Save public key too */
3080 xasprintf(&pubpath, "%s.pub", path);
3081 free(path);
3082 if ((r = sshkey_save_public(keys[i], pubpath,
3083 keys[i]->sk_application)) != 0) {
3084 error_r(r, "Saving public key \"%s\" failed", pubpath);
3085 free(pubpath);
3086 break;
3087 }
3088 free(pubpath);
3089 }
3090
3091 if (i >= nkeys)
3092 ret = 0; /* success */
3093 if (pass != NULL)
3094 freezero(pass, strlen(pass));
3095 for (i = 0; i < nkeys; i++)
3096 sshkey_free(keys[i]);
3097 free(keys);
3098 return ret;
3099 }
3100
3101 static void
3102 save_attestation(struct sshbuf *attest, const char *path)
3103 {
3104 mode_t omask;
3105 int r;
3106
3107 if (path == NULL)
3108 return; /* nothing to do */
3109 if (attest == NULL || sshbuf_len(attest) == 0)
3110 fatal("Enrollment did not return attestation data");
3111 omask = umask(077);
3112 r = sshbuf_write_file(path, attest);
3113 umask(omask);
3114 if (r != 0)
3115 fatal_r(r, "Unable to write attestation data \"%s\"", path);
3116 if (!quiet)
3117 printf("Your FIDO attestation certificate has been saved in "
3118 "%s\n", path);
3119 }
3120
3121 static void
3122 usage(void)
3123 {
3124 fprintf(stderr,
3125 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n"
3126 " [-m format] [-N new_passphrase] [-O option]\n"
3127 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n"
3128 " [-w provider] [-Z cipher]\n"
3129 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n"
3130 " [-P old_passphrase] [-Z cipher]\n"
3131 #ifdef WITH_OPENSSL
3132 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n"
3133 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n"
3134 #endif
3135 " ssh-keygen -y [-f input_keyfile]\n"
3136 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n"
3137 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
3138 " ssh-keygen -B [-f input_keyfile]\n");
3139 #ifdef ENABLE_PKCS11
3140 fprintf(stderr,
3141 " ssh-keygen -D pkcs11\n");
3142 #endif
3143 fprintf(stderr,
3144 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n"
3145 " ssh-keygen -H [-f known_hosts_file]\n"
3146 " ssh-keygen -K [-a rounds] [-w provider]\n"
3147 " ssh-keygen -R hostname [-f known_hosts_file]\n"
3148 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n"
3149 #ifdef WITH_OPENSSL
3150 " ssh-keygen -M generate [-O option] output_file\n"
3151 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n"
3152 #endif
3153 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n"
3154 " [-n principals] [-O option] [-V validity_interval]\n"
3155 " [-z serial_number] file ...\n"
3156 " ssh-keygen -L [-f input_keyfile]\n"
3157 " ssh-keygen -A [-a rounds] [-f prefix_path]\n"
3158 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
3159 " file ...\n"
3160 " ssh-keygen -Q [-l] -f krl_file [file ...]\n"
3161 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n"
3162 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n"
3163 " ssh-keygen -Y sign -f key_file -n namespace file ...\n"
3164 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n"
3165 " -n namespace -s signature_file [-r revocation_file]\n");
3166 exit(1);
3167 }
3168
3169 /*
3170 * Main program for key management.
3171 */
3172 int
3173 main(int argc, char **argv)
3174 {
3175 char comment[1024], *passphrase;
3176 char *rr_hostname = NULL, *ep, *fp, *ra;
3177 struct sshkey *private, *public;
3178 struct passwd *pw;
3179 int r, opt, type;
3180 int change_passphrase = 0, change_comment = 0, show_cert = 0;
3181 int find_host = 0, delete_host = 0, hash_hosts = 0;
3182 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
3183 int prefer_agent = 0, convert_to = 0, convert_from = 0;
3184 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0;
3185 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0;
3186 unsigned long long cert_serial = 0;
3187 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL;
3188 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL;
3189 char *sk_attestation_path = NULL;
3190 struct sshbuf *challenge = NULL, *attest = NULL;
3191 size_t i, nopts = 0;
3192 u_int32_t bits = 0;
3193 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD;
3194 const char *errstr;
3195 int log_level = SYSLOG_LEVEL_INFO;
3196 char *sign_op = NULL;
3197
3198 extern int optind;
3199 extern char *optarg;
3200
3201 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
3202 sanitise_stdfd();
3203
3204 __progname = ssh_get_progname(argv[0]);
3205
3206 seed_rng();
3207
3208 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
3209
3210 msetlocale();
3211
3212 /* we need this for the home * directory. */
3213 pw = getpwuid(getuid());
3214 if (!pw)
3215 fatal("No user exists for uid %lu", (u_long)getuid());
3216 pw = pwcopy(pw);
3217 if (gethostname(hostname, sizeof(hostname)) == -1)
3218 fatal("gethostname: %s", strerror(errno));
3219
3220 sk_provider = getenv("SSH_SK_PROVIDER");
3221
3222 /* Remaining characters: dGjJSTWx */
3223 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy"
3224 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:"
3225 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) {
3226 switch (opt) {
3227 case 'A':
3228 gen_all_hostkeys = 1;
3229 break;
3230 case 'b':
3231 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX,
3232 &errstr);
3233 if (errstr)
3234 fatal("Bits has bad value %s (%s)",
3235 optarg, errstr);
3236 break;
3237 case 'E':
3238 fingerprint_hash = ssh_digest_alg_by_name(optarg);
3239 if (fingerprint_hash == -1)
3240 fatal("Invalid hash algorithm \"%s\"", optarg);
3241 break;
3242 case 'F':
3243 find_host = 1;
3244 rr_hostname = optarg;
3245 break;
3246 case 'H':
3247 hash_hosts = 1;
3248 break;
3249 case 'I':
3250 cert_key_id = optarg;
3251 break;
3252 case 'R':
3253 delete_host = 1;
3254 rr_hostname = optarg;
3255 break;
3256 case 'L':
3257 show_cert = 1;
3258 break;
3259 case 'l':
3260 print_fingerprint = 1;
3261 break;
3262 case 'B':
3263 print_bubblebabble = 1;
3264 break;
3265 case 'm':
3266 if (strcasecmp(optarg, "RFC4716") == 0 ||
3267 strcasecmp(optarg, "ssh2") == 0) {
3268 convert_format = FMT_RFC4716;
3269 break;
3270 }
3271 if (strcasecmp(optarg, "PKCS8") == 0) {
3272 convert_format = FMT_PKCS8;
3273 private_key_format = SSHKEY_PRIVATE_PKCS8;
3274 break;
3275 }
3276 if (strcasecmp(optarg, "PEM") == 0) {
3277 convert_format = FMT_PEM;
3278 private_key_format = SSHKEY_PRIVATE_PEM;
3279 break;
3280 }
3281 fatal("Unsupported conversion format \"%s\"", optarg);
3282 case 'n':
3283 cert_principals = optarg;
3284 break;
3285 case 'o':
3286 /* no-op; new format is already the default */
3287 break;
3288 case 'p':
3289 change_passphrase = 1;
3290 break;
3291 case 'c':
3292 change_comment = 1;
3293 break;
3294 case 'f':
3295 if (strlcpy(identity_file, optarg,
3296 sizeof(identity_file)) >= sizeof(identity_file))
3297 fatal("Identity filename too long");
3298 have_identity = 1;
3299 break;
3300 case 'g':
3301 print_generic = 1;
3302 break;
3303 case 'K':
3304 download_sk = 1;
3305 break;
3306 case 'P':
3307 identity_passphrase = optarg;
3308 break;
3309 case 'N':
3310 identity_new_passphrase = optarg;
3311 break;
3312 case 'Q':
3313 check_krl = 1;
3314 break;
3315 case 'O':
3316 opts = xrecallocarray(opts, nopts, nopts + 1,
3317 sizeof(*opts));
3318 opts[nopts++] = xstrdup(optarg);
3319 break;
3320 case 'Z':
3321 openssh_format_cipher = optarg;
3322 if (cipher_by_name(openssh_format_cipher) == NULL)
3323 fatal("Invalid OpenSSH-format cipher '%s'",
3324 openssh_format_cipher);
3325 break;
3326 case 'C':
3327 identity_comment = optarg;
3328 break;
3329 case 'q':
3330 quiet = 1;
3331 break;
3332 case 'e':
3333 /* export key */
3334 convert_to = 1;
3335 break;
3336 case 'h':
3337 cert_key_type = SSH2_CERT_TYPE_HOST;
3338 certflags_flags = 0;
3339 break;
3340 case 'k':
3341 gen_krl = 1;
3342 break;
3343 case 'i':
3344 case 'X':
3345 /* import key */
3346 convert_from = 1;
3347 break;
3348 case 'y':
3349 print_public = 1;
3350 break;
3351 case 's':
3352 ca_key_path = optarg;
3353 break;
3354 case 't':
3355 key_type_name = optarg;
3356 break;
3357 case 'D':
3358 pkcs11provider = optarg;
3359 break;
3360 case 'U':
3361 prefer_agent = 1;
3362 break;
3363 case 'u':
3364 update_krl = 1;
3365 break;
3366 case 'v':
3367 if (log_level == SYSLOG_LEVEL_INFO)
3368 log_level = SYSLOG_LEVEL_DEBUG1;
3369 else {
3370 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
3371 log_level < SYSLOG_LEVEL_DEBUG3)
3372 log_level++;
3373 }
3374 break;
3375 case 'r':
3376 rr_hostname = optarg;
3377 break;
3378 case 'a':
3379 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
3380 if (errstr)
3381 fatal("Invalid number: %s (%s)",
3382 optarg, errstr);
3383 break;
3384 case 'V':
3385 parse_cert_times(optarg);
3386 break;
3387 case 'Y':
3388 sign_op = optarg;
3389 break;
3390 case 'w':
3391 sk_provider = optarg;
3392 break;
3393 case 'z':
3394 errno = 0;
3395 if (*optarg == '+') {
3396 cert_serial_autoinc = 1;
3397 optarg++;
3398 }
3399 cert_serial = strtoull(optarg, &ep, 10);
3400 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
3401 (errno == ERANGE && cert_serial == ULLONG_MAX))
3402 fatal("Invalid serial number \"%s\"", optarg);
3403 break;
3404 case 'M':
3405 if (strcmp(optarg, "generate") == 0)
3406 do_gen_candidates = 1;
3407 else if (strcmp(optarg, "screen") == 0)
3408 do_screen_candidates = 1;
3409 else
3410 fatal("Unsupported moduli option %s", optarg);
3411 break;
3412 case '?':
3413 default:
3414 usage();
3415 }
3416 }
3417
3418 #ifdef ENABLE_SK_INTERNAL
3419 if (sk_provider == NULL)
3420 sk_provider = "internal";
3421 #endif
3422
3423 /* reinit */
3424 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
3425
3426 argv += optind;
3427 argc -= optind;
3428
3429 if (sign_op != NULL) {
3430 if (strncmp(sign_op, "find-principals", 15) == 0) {
3431 if (ca_key_path == NULL) {
3432 error("Too few arguments for find-principals:"
3433 "missing signature file");
3434 exit(1);
3435 }
3436 if (!have_identity) {
3437 error("Too few arguments for find-principals:"
3438 "missing allowed keys file");
3439 exit(1);
3440 }
3441 return sig_find_principals(ca_key_path, identity_file,
3442 opts, nopts);
3443 } else if (strncmp(sign_op, "sign", 4) == 0) {
3444 if (cert_principals == NULL ||
3445 *cert_principals == '\0') {
3446 error("Too few arguments for sign: "
3447 "missing namespace");
3448 exit(1);
3449 }
3450 if (!have_identity) {
3451 error("Too few arguments for sign: "
3452 "missing key");
3453 exit(1);
3454 }
3455 return sig_sign(identity_file, cert_principals,
3456 argc, argv);
3457 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) {
3458 if (ca_key_path == NULL) {
3459 error("Too few arguments for check-novalidate: "
3460 "missing signature file");
3461 exit(1);
3462 }
3463 return sig_verify(ca_key_path, cert_principals,
3464 NULL, NULL, NULL, opts, nopts);
3465 } else if (strncmp(sign_op, "verify", 6) == 0) {
3466 if (cert_principals == NULL ||
3467 *cert_principals == '\0') {
3468 error("Too few arguments for verify: "
3469 "missing namespace");
3470 exit(1);
3471 }
3472 if (ca_key_path == NULL) {
3473 error("Too few arguments for verify: "
3474 "missing signature file");
3475 exit(1);
3476 }
3477 if (!have_identity) {
3478 error("Too few arguments for sign: "
3479 "missing allowed keys file");
3480 exit(1);
3481 }
3482 if (cert_key_id == NULL) {
3483 error("Too few arguments for verify: "
3484 "missing principal ID");
3485 exit(1);
3486 }
3487 return sig_verify(ca_key_path, cert_principals,
3488 cert_key_id, identity_file, rr_hostname,
3489 opts, nopts);
3490 }
3491 error("Unsupported operation for -Y: \"%s\"", sign_op);
3492 usage();
3493 /* NOTREACHED */
3494 }
3495
3496 if (ca_key_path != NULL) {
3497 if (argc < 1 && !gen_krl) {
3498 error("Too few arguments.");
3499 usage();
3500 }
3501 } else if (argc > 0 && !gen_krl && !check_krl &&
3502 !do_gen_candidates && !do_screen_candidates) {
3503 error("Too many arguments.");
3504 usage();
3505 }
3506 if (change_passphrase && change_comment) {
3507 error("Can only have one of -p and -c.");
3508 usage();
3509 }
3510 if (print_fingerprint && (delete_host || hash_hosts)) {
3511 error("Cannot use -l with -H or -R.");
3512 usage();
3513 }
3514 if (gen_krl) {
3515 do_gen_krl(pw, update_krl, ca_key_path,
3516 cert_serial, identity_comment, argc, argv);
3517 return (0);
3518 }
3519 if (check_krl) {
3520 do_check_krl(pw, print_fingerprint, argc, argv);
3521 return (0);
3522 }
3523 if (ca_key_path != NULL) {
3524 if (cert_key_id == NULL)
3525 fatal("Must specify key id (-I) when certifying");
3526 for (i = 0; i < nopts; i++)
3527 add_cert_option(opts[i]);
3528 do_ca_sign(pw, ca_key_path, prefer_agent,
3529 cert_serial, cert_serial_autoinc, argc, argv);
3530 }
3531 if (show_cert)
3532 do_show_cert(pw);
3533 if (delete_host || hash_hosts || find_host) {
3534 do_known_hosts(pw, rr_hostname, find_host,
3535 delete_host, hash_hosts);
3536 }
3537 if (pkcs11provider != NULL)
3538 do_download(pw);
3539 if (download_sk) {
3540 for (i = 0; i < nopts; i++) {
3541 if (strncasecmp(opts[i], "device=", 7) == 0) {
3542 sk_device = xstrdup(opts[i] + 7);
3543 } else {
3544 fatal("Option \"%s\" is unsupported for "
3545 "FIDO authenticator download", opts[i]);
3546 }
3547 }
3548 return do_download_sk(sk_provider, sk_device);
3549 }
3550 if (print_fingerprint || print_bubblebabble)
3551 do_fingerprint(pw);
3552 if (change_passphrase)
3553 do_change_passphrase(pw);
3554 if (change_comment)
3555 do_change_comment(pw, identity_comment);
3556 #ifdef WITH_OPENSSL
3557 if (convert_to)
3558 do_convert_to(pw);
3559 if (convert_from)
3560 do_convert_from(pw);
3561 #else /* WITH_OPENSSL */
3562 if (convert_to || convert_from)
3563 fatal("key conversion disabled at compile time");
3564 #endif /* WITH_OPENSSL */
3565 if (print_public)
3566 do_print_public(pw);
3567 if (rr_hostname != NULL) {
3568 unsigned int n = 0;
3569
3570 if (have_identity) {
3571 n = do_print_resource_record(pw, identity_file,
3572 rr_hostname, print_generic);
3573 if (n == 0)
3574 fatal("%s: %s", identity_file, strerror(errno));
3575 exit(0);
3576 } else {
3577
3578 n += do_print_resource_record(pw,
3579 _PATH_HOST_RSA_KEY_FILE, rr_hostname,
3580 print_generic);
3581 n += do_print_resource_record(pw,
3582 _PATH_HOST_DSA_KEY_FILE, rr_hostname,
3583 print_generic);
3584 n += do_print_resource_record(pw,
3585 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname,
3586 print_generic);
3587 n += do_print_resource_record(pw,
3588 _PATH_HOST_ED25519_KEY_FILE, rr_hostname,
3589 print_generic);
3590 n += do_print_resource_record(pw,
3591 _PATH_HOST_XMSS_KEY_FILE, rr_hostname,
3592 print_generic);
3593 if (n == 0)
3594 fatal("no keys found.");
3595 exit(0);
3596 }
3597 }
3598
3599 if (do_gen_candidates || do_screen_candidates) {
3600 if (argc <= 0)
3601 fatal("No output file specified");
3602 else if (argc > 1)
3603 fatal("Too many output files specified");
3604 }
3605 if (do_gen_candidates) {
3606 do_moduli_gen(argv[0], opts, nopts);
3607 return 0;
3608 }
3609 if (do_screen_candidates) {
3610 do_moduli_screen(argv[0], opts, nopts);
3611 return 0;
3612 }
3613
3614 if (gen_all_hostkeys) {
3615 do_gen_all_hostkeys(pw);
3616 return (0);
3617 }
3618
3619 if (key_type_name == NULL)
3620 key_type_name = DEFAULT_KEY_TYPE_NAME;
3621
3622 type = sshkey_type_from_name(key_type_name);
3623 type_bits_valid(type, key_type_name, &bits);
3624
3625 if (!quiet)
3626 printf("Generating public/private %s key pair.\n",
3627 key_type_name);
3628 switch (type) {
3629 case KEY_ECDSA_SK:
3630 case KEY_ED25519_SK:
3631 for (i = 0; i < nopts; i++) {
3632 if (strcasecmp(opts[i], "no-touch-required") == 0) {
3633 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
3634 } else if (strcasecmp(opts[i], "verify-required") == 0) {
3635 sk_flags |= SSH_SK_USER_VERIFICATION_REQD;
3636 } else if (strcasecmp(opts[i], "resident") == 0) {
3637 sk_flags |= SSH_SK_RESIDENT_KEY;
3638 } else if (strncasecmp(opts[i], "device=", 7) == 0) {
3639 sk_device = xstrdup(opts[i] + 7);
3640 } else if (strncasecmp(opts[i], "user=", 5) == 0) {
3641 sk_user = xstrdup(opts[i] + 5);
3642 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) {
3643 if ((r = sshbuf_load_file(opts[i] + 10,
3644 &challenge)) != 0) {
3645 fatal_r(r, "Unable to load FIDO "
3646 "enrollment challenge \"%s\"",
3647 opts[i] + 10);
3648 }
3649 } else if (strncasecmp(opts[i],
3650 "write-attestation=", 18) == 0) {
3651 sk_attestation_path = opts[i] + 18;
3652 } else if (strncasecmp(opts[i],
3653 "application=", 12) == 0) {
3654 sk_application = xstrdup(opts[i] + 12);
3655 if (strncmp(sk_application, "ssh:", 4) != 0) {
3656 fatal("FIDO application string must "
3657 "begin with \"ssh:\"");
3658 }
3659 } else {
3660 fatal("Option \"%s\" is unsupported for "
3661 "FIDO authenticator enrollment", opts[i]);
3662 }
3663 }
3664 if (!quiet) {
3665 printf("You may need to touch your authenticator "
3666 "to authorize key generation.\n");
3667 }
3668 if ((attest = sshbuf_new()) == NULL)
3669 fatal("sshbuf_new failed");
3670 if ((sk_flags &
3671 (SSH_SK_USER_VERIFICATION_REQD|SSH_SK_RESIDENT_KEY))) {
3672 passphrase = read_passphrase("Enter PIN for "
3673 "authenticator: ", RP_ALLOW_STDIN);
3674 } else {
3675 passphrase = NULL;
3676 }
3677 for (i = 0 ; ; i++) {
3678 fflush(stdout);
3679 r = sshsk_enroll(type, sk_provider, sk_device,
3680 sk_application == NULL ? "ssh:" : sk_application,
3681 sk_user, sk_flags, passphrase, challenge,
3682 &private, attest);
3683 if (r == 0)
3684 break;
3685 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
3686 fatal_r(r, "Key enrollment failed");
3687 else if (passphrase != NULL) {
3688 error("PIN incorrect");
3689 freezero(passphrase, strlen(passphrase));
3690 passphrase = NULL;
3691 }
3692 if (i >= 3)
3693 fatal("Too many incorrect PINs");
3694 passphrase = read_passphrase("Enter PIN for "
3695 "authenticator: ", RP_ALLOW_STDIN);
3696 if (!quiet) {
3697 printf("You may need to touch your "
3698 "authenticator (again) to authorize "
3699 "key generation.\n");
3700 }
3701 }
3702 if (passphrase != NULL) {
3703 freezero(passphrase, strlen(passphrase));
3704 passphrase = NULL;
3705 }
3706 break;
3707 default:
3708 if ((r = sshkey_generate(type, bits, &private)) != 0)
3709 fatal("sshkey_generate failed");
3710 break;
3711 }
3712 if ((r = sshkey_from_private(private, &public)) != 0)
3713 fatal_r(r, "sshkey_from_private");
3714
3715 if (!have_identity)
3716 ask_filename(pw, "Enter file in which to save the key");
3717
3718 /* Create ~/.ssh directory if it doesn't already exist. */
3719 hostfile_create_user_ssh_dir(identity_file, !quiet);
3720
3721 /* If the file already exists, ask the user to confirm. */
3722 if (!confirm_overwrite(identity_file))
3723 exit(1);
3724
3725 /* Determine the passphrase for the private key */
3726 passphrase = private_key_passphrase();
3727 if (identity_comment) {
3728 strlcpy(comment, identity_comment, sizeof(comment));
3729 } else {
3730 /* Create default comment field for the passphrase. */
3731 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
3732 }
3733
3734 /* Save the key with the given passphrase and comment. */
3735 if ((r = sshkey_save_private(private, identity_file, passphrase,
3736 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
3737 error_r(r, "Saving key \"%s\" failed", identity_file);
3738 freezero(passphrase, strlen(passphrase));
3739 exit(1);
3740 }
3741 freezero(passphrase, strlen(passphrase));
3742 sshkey_free(private);
3743
3744 if (!quiet) {
3745 printf("Your identification has been saved in %s\n",
3746 identity_file);
3747 }
3748
3749 strlcat(identity_file, ".pub", sizeof(identity_file));
3750 if ((r = sshkey_save_public(public, identity_file, comment)) != 0)
3751 fatal_r(r, "Unable to save public key to %s", identity_file);
3752
3753 if (!quiet) {
3754 fp = sshkey_fingerprint(public, fingerprint_hash,
3755 SSH_FP_DEFAULT);
3756 ra = sshkey_fingerprint(public, fingerprint_hash,
3757 SSH_FP_RANDOMART);
3758 if (fp == NULL || ra == NULL)
3759 fatal("sshkey_fingerprint failed");
3760 printf("Your public key has been saved in %s\n",
3761 identity_file);
3762 printf("The key fingerprint is:\n");
3763 printf("%s %s\n", fp, comment);
3764 printf("The key's randomart image is:\n");
3765 printf("%s\n", ra);
3766 free(ra);
3767 free(fp);
3768 }
3769
3770 if (sk_attestation_path != NULL)
3771 save_attestation(attest, sk_attestation_path);
3772
3773 sshbuf_free(attest);
3774 sshkey_free(public);
3775
3776 exit(0);
3777 }
DragonFly BSD