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1 /* $OpenBSD: ssh-keygen.c,v 1.381 2020/01/02 22:40:09 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
69 #ifdef WITH_OPENSSL
70 # define DEFAULT_KEY_TYPE_NAME "rsa"
71 #else
72 # define DEFAULT_KEY_TYPE_NAME "ed25519"
73 #endif
74
75 /*
76 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be
77 * overridden on the command line.
78 *
79 * These values, with the exception of DSA, provide security equivalent to at
80 * least 128 bits of security according to NIST Special Publication 800-57:
81 * Recommendation for Key Management Part 1 rev 4 section 5.6.1.
82 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
83 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
84 * SHA1 we limit the DSA key size 1k bits.
85 */
86 #define DEFAULT_BITS 3072
87 #define DEFAULT_BITS_DSA 1024
88 #define DEFAULT_BITS_ECDSA 256
89
90 static int quiet = 0;
91
92 /* Flag indicating that we just want to see the key fingerprint */
93 static int print_fingerprint = 0;
94 static int print_bubblebabble = 0;
95
96 /* Hash algorithm to use for fingerprints. */
97 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
98
99 /* The identity file name, given on the command line or entered by the user. */
100 static char identity_file[PATH_MAX];
101 static int have_identity = 0;
102
103 /* This is set to the passphrase if given on the command line. */
104 static char *identity_passphrase = NULL;
105
106 /* This is set to the new passphrase if given on the command line. */
107 static char *identity_new_passphrase = NULL;
108
109 /* Key type when certifying */
110 static u_int cert_key_type = SSH2_CERT_TYPE_USER;
111
112 /* "key ID" of signed key */
113 static char *cert_key_id = NULL;
114
115 /* Comma-separated list of principal names for certifying keys */
116 static char *cert_principals = NULL;
117
118 /* Validity period for certificates */
119 static u_int64_t cert_valid_from = 0;
120 static u_int64_t cert_valid_to = ~0ULL;
121
122 /* Certificate options */
123 #define CERTOPT_X_FWD (1)
124 #define CERTOPT_AGENT_FWD (1<<1)
125 #define CERTOPT_PORT_FWD (1<<2)
126 #define CERTOPT_PTY (1<<3)
127 #define CERTOPT_USER_RC (1<<4)
128 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5)
129 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
130 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
131 static u_int32_t certflags_flags = CERTOPT_DEFAULT;
132 static char *certflags_command = NULL;
133 static char *certflags_src_addr = NULL;
134
135 /* Arbitrary extensions specified by user */
136 struct cert_userext {
137 char *key;
138 char *val;
139 int crit;
140 };
141 static struct cert_userext *cert_userext;
142 static size_t ncert_userext;
143
144 /* Conversion to/from various formats */
145 enum {
146 FMT_RFC4716,
147 FMT_PKCS8,
148 FMT_PEM
149 } convert_format = FMT_RFC4716;
150
151 static char *key_type_name = NULL;
152
153 /* Load key from this PKCS#11 provider */
154 static char *pkcs11provider = NULL;
155
156 /* FIDO/U2F provider to use */
157 static char *sk_provider = NULL;
158
159 /* Format for writing private keys */
160 static int private_key_format = SSHKEY_PRIVATE_OPENSSH;
161
162 /* Cipher for new-format private keys */
163 static char *openssh_format_cipher = NULL;
164
165 /* Number of KDF rounds to derive new format keys. */
166 static int rounds = 0;
167
168 /* argv0 */
169 extern char *__progname;
170
171 static char hostname[NI_MAXHOST];
172
173 #ifdef WITH_OPENSSL
174 /* moduli.c */
175 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
176 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
177 unsigned long);
178 #endif
179
180 static void
181 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
182 {
183 if (type == KEY_UNSPEC)
184 fatal("unknown key type %s", key_type_name);
185 if (*bitsp == 0) {
186 #ifdef WITH_OPENSSL
187 u_int nid;
188
189 switch(type) {
190 case KEY_DSA:
191 *bitsp = DEFAULT_BITS_DSA;
192 break;
193 case KEY_ECDSA:
194 if (name != NULL &&
195 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
196 *bitsp = sshkey_curve_nid_to_bits(nid);
197 if (*bitsp == 0)
198 *bitsp = DEFAULT_BITS_ECDSA;
199 break;
200 case KEY_RSA:
201 *bitsp = DEFAULT_BITS;
202 break;
203 }
204 #endif
205 }
206 #ifdef WITH_OPENSSL
207 switch (type) {
208 case KEY_DSA:
209 if (*bitsp != 1024)
210 fatal("Invalid DSA key length: must be 1024 bits");
211 break;
212 case KEY_RSA:
213 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
214 fatal("Invalid RSA key length: minimum is %d bits",
215 SSH_RSA_MINIMUM_MODULUS_SIZE);
216 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS)
217 fatal("Invalid RSA key length: maximum is %d bits",
218 OPENSSL_RSA_MAX_MODULUS_BITS);
219 break;
220 case KEY_ECDSA:
221 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
222 fatal("Invalid ECDSA key length: valid lengths are "
223 #ifdef OPENSSL_HAS_NISTP521
224 "256, 384 or 521 bits");
225 #else
226 "256 or 384 bits");
227 #endif
228 }
229 #endif
230 }
231
232 /*
233 * Checks whether a file exists and, if so, asks the user whether they wish
234 * to overwrite it.
235 * Returns nonzero if the file does not already exist or if the user agrees to
236 * overwrite, or zero otherwise.
237 */
238 static int
239 confirm_overwrite(const char *filename)
240 {
241 char yesno[3];
242 struct stat st;
243
244 if (stat(filename, &st) != 0)
245 return 1;
246 printf("%s already exists.\n", filename);
247 printf("Overwrite (y/n)? ");
248 fflush(stdout);
249 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
250 return 0;
251 if (yesno[0] != 'y' && yesno[0] != 'Y')
252 return 0;
253 return 1;
254 }
255
256 static void
257 ask_filename(struct passwd *pw, const char *prompt)
258 {
259 char buf[1024];
260 char *name = NULL;
261
262 if (key_type_name == NULL)
263 name = _PATH_SSH_CLIENT_ID_RSA;
264 else {
265 switch (sshkey_type_from_name(key_type_name)) {
266 case KEY_DSA_CERT:
267 case KEY_DSA:
268 name = _PATH_SSH_CLIENT_ID_DSA;
269 break;
270 #ifdef OPENSSL_HAS_ECC
271 case KEY_ECDSA_CERT:
272 case KEY_ECDSA:
273 name = _PATH_SSH_CLIENT_ID_ECDSA;
274 break;
275 case KEY_ECDSA_SK_CERT:
276 case KEY_ECDSA_SK:
277 name = _PATH_SSH_CLIENT_ID_ECDSA_SK;
278 break;
279 #endif
280 case KEY_RSA_CERT:
281 case KEY_RSA:
282 name = _PATH_SSH_CLIENT_ID_RSA;
283 break;
284 case KEY_ED25519:
285 case KEY_ED25519_CERT:
286 name = _PATH_SSH_CLIENT_ID_ED25519;
287 break;
288 case KEY_ED25519_SK:
289 case KEY_ED25519_SK_CERT:
290 name = _PATH_SSH_CLIENT_ID_ED25519_SK;
291 break;
292 case KEY_XMSS:
293 case KEY_XMSS_CERT:
294 name = _PATH_SSH_CLIENT_ID_XMSS;
295 break;
296 default:
297 fatal("bad key type");
298 }
299 }
300 snprintf(identity_file, sizeof(identity_file),
301 "%s/%s", pw->pw_dir, name);
302 printf("%s (%s): ", prompt, identity_file);
303 fflush(stdout);
304 if (fgets(buf, sizeof(buf), stdin) == NULL)
305 exit(1);
306 buf[strcspn(buf, "\n")] = '\0';
307 if (strcmp(buf, "") != 0)
308 strlcpy(identity_file, buf, sizeof(identity_file));
309 have_identity = 1;
310 }
311
312 static struct sshkey *
313 load_identity(const char *filename, char **commentp)
314 {
315 char *pass;
316 struct sshkey *prv;
317 int r;
318
319 if (commentp != NULL)
320 *commentp = NULL;
321 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0)
322 return prv;
323 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
324 fatal("Load key \"%s\": %s", filename, ssh_err(r));
325 if (identity_passphrase)
326 pass = xstrdup(identity_passphrase);
327 else
328 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
329 r = sshkey_load_private(filename, pass, &prv, commentp);
330 explicit_bzero(pass, strlen(pass));
331 free(pass);
332 if (r != 0)
333 fatal("Load key \"%s\": %s", filename, ssh_err(r));
334 return prv;
335 }
336
337 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
338 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
339 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
340 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
341
342 #ifdef WITH_OPENSSL
343 static void
344 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
345 {
346 struct sshbuf *b;
347 char comment[61], *b64;
348 int r;
349
350 if ((b = sshbuf_new()) == NULL)
351 fatal("%s: sshbuf_new failed", __func__);
352 if ((r = sshkey_putb(k, b)) != 0)
353 fatal("key_to_blob failed: %s", ssh_err(r));
354 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
355 fatal("%s: sshbuf_dtob64_string failed", __func__);
356
357 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
358 snprintf(comment, sizeof(comment),
359 "%u-bit %s, converted by %s@%s from OpenSSH",
360 sshkey_size(k), sshkey_type(k),
361 pw->pw_name, hostname);
362
363 sshkey_free(k);
364 sshbuf_free(b);
365
366 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
367 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
368 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
369 free(b64);
370 exit(0);
371 }
372
373 static void
374 do_convert_to_pkcs8(struct sshkey *k)
375 {
376 switch (sshkey_type_plain(k->type)) {
377 case KEY_RSA:
378 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
379 fatal("PEM_write_RSA_PUBKEY failed");
380 break;
381 case KEY_DSA:
382 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
383 fatal("PEM_write_DSA_PUBKEY failed");
384 break;
385 #ifdef OPENSSL_HAS_ECC
386 case KEY_ECDSA:
387 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
388 fatal("PEM_write_EC_PUBKEY failed");
389 break;
390 #endif
391 default:
392 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
393 }
394 exit(0);
395 }
396
397 static void
398 do_convert_to_pem(struct sshkey *k)
399 {
400 switch (sshkey_type_plain(k->type)) {
401 case KEY_RSA:
402 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
403 fatal("PEM_write_RSAPublicKey failed");
404 break;
405 default:
406 fatal("%s: unsupported key type %s", __func__, sshkey_type(k));
407 }
408 exit(0);
409 }
410
411 static void
412 do_convert_to(struct passwd *pw)
413 {
414 struct sshkey *k;
415 struct stat st;
416 int r;
417
418 if (!have_identity)
419 ask_filename(pw, "Enter file in which the key is");
420 if (stat(identity_file, &st) == -1)
421 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
422 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
423 k = load_identity(identity_file, NULL);
424 switch (convert_format) {
425 case FMT_RFC4716:
426 do_convert_to_ssh2(pw, k);
427 break;
428 case FMT_PKCS8:
429 do_convert_to_pkcs8(k);
430 break;
431 case FMT_PEM:
432 do_convert_to_pem(k);
433 break;
434 default:
435 fatal("%s: unknown key format %d", __func__, convert_format);
436 }
437 exit(0);
438 }
439
440 /*
441 * This is almost exactly the bignum1 encoding, but with 32 bit for length
442 * instead of 16.
443 */
444 static void
445 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
446 {
447 u_int bytes, bignum_bits;
448 int r;
449
450 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
451 fatal("%s: buffer error: %s", __func__, ssh_err(r));
452 bytes = (bignum_bits + 7) / 8;
453 if (sshbuf_len(b) < bytes)
454 fatal("%s: input buffer too small: need %d have %zu",
455 __func__, bytes, sshbuf_len(b));
456 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
457 fatal("%s: BN_bin2bn failed", __func__);
458 if ((r = sshbuf_consume(b, bytes)) != 0)
459 fatal("%s: buffer error: %s", __func__, ssh_err(r));
460 }
461
462 static struct sshkey *
463 do_convert_private_ssh2(struct sshbuf *b)
464 {
465 struct sshkey *key = NULL;
466 char *type, *cipher;
467 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
468 int r, rlen, ktype;
469 u_int magic, i1, i2, i3, i4;
470 size_t slen;
471 u_long e;
472 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
473 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
474 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
475 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
476
477 if ((r = sshbuf_get_u32(b, &magic)) != 0)
478 fatal("%s: buffer error: %s", __func__, ssh_err(r));
479
480 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
481 error("bad magic 0x%x != 0x%x", magic,
482 SSH_COM_PRIVATE_KEY_MAGIC);
483 return NULL;
484 }
485 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
486 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
487 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
488 (r = sshbuf_get_u32(b, &i2)) != 0 ||
489 (r = sshbuf_get_u32(b, &i3)) != 0 ||
490 (r = sshbuf_get_u32(b, &i4)) != 0)
491 fatal("%s: buffer error: %s", __func__, ssh_err(r));
492 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
493 if (strcmp(cipher, "none") != 0) {
494 error("unsupported cipher %s", cipher);
495 free(cipher);
496 free(type);
497 return NULL;
498 }
499 free(cipher);
500
501 if (strstr(type, "dsa")) {
502 ktype = KEY_DSA;
503 } else if (strstr(type, "rsa")) {
504 ktype = KEY_RSA;
505 } else {
506 free(type);
507 return NULL;
508 }
509 if ((key = sshkey_new(ktype)) == NULL)
510 fatal("sshkey_new failed");
511 free(type);
512
513 switch (key->type) {
514 case KEY_DSA:
515 if ((dsa_p = BN_new()) == NULL ||
516 (dsa_q = BN_new()) == NULL ||
517 (dsa_g = BN_new()) == NULL ||
518 (dsa_pub_key = BN_new()) == NULL ||
519 (dsa_priv_key = BN_new()) == NULL)
520 fatal("%s: BN_new", __func__);
521 buffer_get_bignum_bits(b, dsa_p);
522 buffer_get_bignum_bits(b, dsa_g);
523 buffer_get_bignum_bits(b, dsa_q);
524 buffer_get_bignum_bits(b, dsa_pub_key);
525 buffer_get_bignum_bits(b, dsa_priv_key);
526 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
527 fatal("%s: DSA_set0_pqg failed", __func__);
528 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
529 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
530 fatal("%s: DSA_set0_key failed", __func__);
531 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
532 break;
533 case KEY_RSA:
534 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
535 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
536 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
537 fatal("%s: buffer error: %s", __func__, ssh_err(r));
538 e = e1;
539 debug("e %lx", e);
540 if (e < 30) {
541 e <<= 8;
542 e += e2;
543 debug("e %lx", e);
544 e <<= 8;
545 e += e3;
546 debug("e %lx", e);
547 }
548 if ((rsa_e = BN_new()) == NULL)
549 fatal("%s: BN_new", __func__);
550 if (!BN_set_word(rsa_e, e)) {
551 BN_clear_free(rsa_e);
552 sshkey_free(key);
553 return NULL;
554 }
555 if ((rsa_n = BN_new()) == NULL ||
556 (rsa_d = BN_new()) == NULL ||
557 (rsa_p = BN_new()) == NULL ||
558 (rsa_q = BN_new()) == NULL ||
559 (rsa_iqmp = BN_new()) == NULL)
560 fatal("%s: BN_new", __func__);
561 buffer_get_bignum_bits(b, rsa_d);
562 buffer_get_bignum_bits(b, rsa_n);
563 buffer_get_bignum_bits(b, rsa_iqmp);
564 buffer_get_bignum_bits(b, rsa_q);
565 buffer_get_bignum_bits(b, rsa_p);
566 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d))
567 fatal("%s: RSA_set0_key failed", __func__);
568 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
569 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q))
570 fatal("%s: RSA_set0_factors failed", __func__);
571 rsa_p = rsa_q = NULL; /* transferred */
572 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
573 fatal("generate RSA parameters failed: %s", ssh_err(r));
574 BN_clear_free(rsa_iqmp);
575 break;
576 }
577 rlen = sshbuf_len(b);
578 if (rlen != 0)
579 error("%s: remaining bytes in key blob %d", __func__, rlen);
580
581 /* try the key */
582 if (sshkey_sign(key, &sig, &slen, data, sizeof(data),
583 NULL, NULL, 0) != 0 ||
584 sshkey_verify(key, sig, slen, data, sizeof(data),
585 NULL, 0, NULL) != 0) {
586 sshkey_free(key);
587 free(sig);
588 return NULL;
589 }
590 free(sig);
591 return key;
592 }
593
594 static int
595 get_line(FILE *fp, char *line, size_t len)
596 {
597 int c;
598 size_t pos = 0;
599
600 line[0] = '\0';
601 while ((c = fgetc(fp)) != EOF) {
602 if (pos >= len - 1)
603 fatal("input line too long.");
604 switch (c) {
605 case '\r':
606 c = fgetc(fp);
607 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
608 fatal("unget: %s", strerror(errno));
609 return pos;
610 case '\n':
611 return pos;
612 }
613 line[pos++] = c;
614 line[pos] = '\0';
615 }
616 /* We reached EOF */
617 return -1;
618 }
619
620 static void
621 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
622 {
623 int r, blen, escaped = 0;
624 u_int len;
625 char line[1024];
626 struct sshbuf *buf;
627 char encoded[8096];
628 FILE *fp;
629
630 if ((buf = sshbuf_new()) == NULL)
631 fatal("sshbuf_new failed");
632 if ((fp = fopen(identity_file, "r")) == NULL)
633 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
634 encoded[0] = '\0';
635 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
636 if (blen > 0 && line[blen - 1] == '\\')
637 escaped++;
638 if (strncmp(line, "----", 4) == 0 ||
639 strstr(line, ": ") != NULL) {
640 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
641 *private = 1;
642 if (strstr(line, " END ") != NULL) {
643 break;
644 }
645 /* fprintf(stderr, "ignore: %s", line); */
646 continue;
647 }
648 if (escaped) {
649 escaped--;
650 /* fprintf(stderr, "escaped: %s", line); */
651 continue;
652 }
653 strlcat(encoded, line, sizeof(encoded));
654 }
655 len = strlen(encoded);
656 if (((len % 4) == 3) &&
657 (encoded[len-1] == '=') &&
658 (encoded[len-2] == '=') &&
659 (encoded[len-3] == '='))
660 encoded[len-3] = '\0';
661 if ((r = sshbuf_b64tod(buf, encoded)) != 0)
662 fatal("%s: base64 decoding failed: %s", __func__, ssh_err(r));
663 if (*private)
664 *k = do_convert_private_ssh2(buf);
665 else if ((r = sshkey_fromb(buf, k)) != 0)
666 fatal("decode blob failed: %s", ssh_err(r));
667 sshbuf_free(buf);
668 fclose(fp);
669 }
670
671 static void
672 do_convert_from_pkcs8(struct sshkey **k, int *private)
673 {
674 EVP_PKEY *pubkey;
675 FILE *fp;
676
677 if ((fp = fopen(identity_file, "r")) == NULL)
678 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
679 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
680 fatal("%s: %s is not a recognised public key format", __func__,
681 identity_file);
682 }
683 fclose(fp);
684 switch (EVP_PKEY_base_id(pubkey)) {
685 case EVP_PKEY_RSA:
686 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
687 fatal("sshkey_new failed");
688 (*k)->type = KEY_RSA;
689 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
690 break;
691 case EVP_PKEY_DSA:
692 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
693 fatal("sshkey_new failed");
694 (*k)->type = KEY_DSA;
695 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
696 break;
697 #ifdef OPENSSL_HAS_ECC
698 case EVP_PKEY_EC:
699 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
700 fatal("sshkey_new failed");
701 (*k)->type = KEY_ECDSA;
702 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
703 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
704 break;
705 #endif
706 default:
707 fatal("%s: unsupported pubkey type %d", __func__,
708 EVP_PKEY_base_id(pubkey));
709 }
710 EVP_PKEY_free(pubkey);
711 return;
712 }
713
714 static void
715 do_convert_from_pem(struct sshkey **k, int *private)
716 {
717 FILE *fp;
718 RSA *rsa;
719
720 if ((fp = fopen(identity_file, "r")) == NULL)
721 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
722 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
723 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
724 fatal("sshkey_new failed");
725 (*k)->type = KEY_RSA;
726 (*k)->rsa = rsa;
727 fclose(fp);
728 return;
729 }
730 fatal("%s: unrecognised raw private key format", __func__);
731 }
732
733 static void
734 do_convert_from(struct passwd *pw)
735 {
736 struct sshkey *k = NULL;
737 int r, private = 0, ok = 0;
738 struct stat st;
739
740 if (!have_identity)
741 ask_filename(pw, "Enter file in which the key is");
742 if (stat(identity_file, &st) == -1)
743 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
744
745 switch (convert_format) {
746 case FMT_RFC4716:
747 do_convert_from_ssh2(pw, &k, &private);
748 break;
749 case FMT_PKCS8:
750 do_convert_from_pkcs8(&k, &private);
751 break;
752 case FMT_PEM:
753 do_convert_from_pem(&k, &private);
754 break;
755 default:
756 fatal("%s: unknown key format %d", __func__, convert_format);
757 }
758
759 if (!private) {
760 if ((r = sshkey_write(k, stdout)) == 0)
761 ok = 1;
762 if (ok)
763 fprintf(stdout, "\n");
764 } else {
765 switch (k->type) {
766 case KEY_DSA:
767 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
768 NULL, 0, NULL, NULL);
769 break;
770 #ifdef OPENSSL_HAS_ECC
771 case KEY_ECDSA:
772 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
773 NULL, 0, NULL, NULL);
774 break;
775 #endif
776 case KEY_RSA:
777 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
778 NULL, 0, NULL, NULL);
779 break;
780 default:
781 fatal("%s: unsupported key type %s", __func__,
782 sshkey_type(k));
783 }
784 }
785
786 if (!ok)
787 fatal("key write failed");
788 sshkey_free(k);
789 exit(0);
790 }
791 #endif
792
793 static void
794 do_print_public(struct passwd *pw)
795 {
796 struct sshkey *prv;
797 struct stat st;
798 int r;
799 char *comment = NULL;
800
801 if (!have_identity)
802 ask_filename(pw, "Enter file in which the key is");
803 if (stat(identity_file, &st) == -1)
804 fatal("%s: %s", identity_file, strerror(errno));
805 prv = load_identity(identity_file, &comment);
806 if ((r = sshkey_write(prv, stdout)) != 0)
807 error("sshkey_write failed: %s", ssh_err(r));
808 sshkey_free(prv);
809 if (comment != NULL && *comment != '\0')
810 fprintf(stdout, " %s", comment);
811 fprintf(stdout, "\n");
812 free(comment);
813 exit(0);
814 }
815
816 static void
817 do_download(struct passwd *pw)
818 {
819 #ifdef ENABLE_PKCS11
820 struct sshkey **keys = NULL;
821 int i, nkeys;
822 enum sshkey_fp_rep rep;
823 int fptype;
824 char *fp, *ra;
825
826 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
827 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
828
829 pkcs11_init(1);
830 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys);
831 if (nkeys <= 0)
832 fatal("cannot read public key from pkcs11");
833 for (i = 0; i < nkeys; i++) {
834 if (print_fingerprint) {
835 fp = sshkey_fingerprint(keys[i], fptype, rep);
836 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
837 SSH_FP_RANDOMART);
838 if (fp == NULL || ra == NULL)
839 fatal("%s: sshkey_fingerprint fail", __func__);
840 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
841 fp, sshkey_type(keys[i]));
842 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
843 printf("%s\n", ra);
844 free(ra);
845 free(fp);
846 } else {
847 (void) sshkey_write(keys[i], stdout); /* XXX check */
848 fprintf(stdout, "\n");
849 }
850 sshkey_free(keys[i]);
851 }
852 free(keys);
853 pkcs11_terminate();
854 exit(0);
855 #else
856 fatal("no pkcs11 support");
857 #endif /* ENABLE_PKCS11 */
858 }
859
860 static struct sshkey *
861 try_read_key(char **cpp)
862 {
863 struct sshkey *ret;
864 int r;
865
866 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
867 fatal("sshkey_new failed");
868 if ((r = sshkey_read(ret, cpp)) == 0)
869 return ret;
870 /* Not a key */
871 sshkey_free(ret);
872 return NULL;
873 }
874
875 static void
876 fingerprint_one_key(const struct sshkey *public, const char *comment)
877 {
878 char *fp = NULL, *ra = NULL;
879 enum sshkey_fp_rep rep;
880 int fptype;
881
882 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
883 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
884 fp = sshkey_fingerprint(public, fptype, rep);
885 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
886 if (fp == NULL || ra == NULL)
887 fatal("%s: sshkey_fingerprint failed", __func__);
888 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
889 comment ? comment : "no comment", sshkey_type(public));
890 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
891 printf("%s\n", ra);
892 free(ra);
893 free(fp);
894 }
895
896 static void
897 fingerprint_private(const char *path)
898 {
899 struct stat st;
900 char *comment = NULL;
901 struct sshkey *public = NULL;
902 int r;
903
904 if (stat(identity_file, &st) == -1)
905 fatal("%s: %s", path, strerror(errno));
906 if ((r = sshkey_load_public(path, &public, &comment)) != 0) {
907 debug("load public \"%s\": %s", path, ssh_err(r));
908 if ((r = sshkey_load_private(path, NULL,
909 &public, &comment)) != 0) {
910 debug("load private \"%s\": %s", path, ssh_err(r));
911 fatal("%s is not a key file.", path);
912 }
913 }
914
915 fingerprint_one_key(public, comment);
916 sshkey_free(public);
917 free(comment);
918 }
919
920 static void
921 do_fingerprint(struct passwd *pw)
922 {
923 FILE *f;
924 struct sshkey *public = NULL;
925 char *comment = NULL, *cp, *ep, *line = NULL;
926 size_t linesize = 0;
927 int i, invalid = 1;
928 const char *path;
929 u_long lnum = 0;
930
931 if (!have_identity)
932 ask_filename(pw, "Enter file in which the key is");
933 path = identity_file;
934
935 if (strcmp(identity_file, "-") == 0) {
936 f = stdin;
937 path = "(stdin)";
938 } else if ((f = fopen(path, "r")) == NULL)
939 fatal("%s: %s: %s", __progname, path, strerror(errno));
940
941 while (getline(&line, &linesize, f) != -1) {
942 lnum++;
943 cp = line;
944 cp[strcspn(cp, "\n")] = '\0';
945 /* Trim leading space and comments */
946 cp = line + strspn(line, " \t");
947 if (*cp == '#' || *cp == '\0')
948 continue;
949
950 /*
951 * Input may be plain keys, private keys, authorized_keys
952 * or known_hosts.
953 */
954
955 /*
956 * Try private keys first. Assume a key is private if
957 * "SSH PRIVATE KEY" appears on the first line and we're
958 * not reading from stdin (XXX support private keys on stdin).
959 */
960 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
961 strstr(cp, "PRIVATE KEY") != NULL) {
962 free(line);
963 fclose(f);
964 fingerprint_private(path);
965 exit(0);
966 }
967
968 /*
969 * If it's not a private key, then this must be prepared to
970 * accept a public key prefixed with a hostname or options.
971 * Try a bare key first, otherwise skip the leading stuff.
972 */
973 if ((public = try_read_key(&cp)) == NULL) {
974 i = strtol(cp, &ep, 10);
975 if (i == 0 || ep == NULL ||
976 (*ep != ' ' && *ep != '\t')) {
977 int quoted = 0;
978
979 comment = cp;
980 for (; *cp && (quoted || (*cp != ' ' &&
981 *cp != '\t')); cp++) {
982 if (*cp == '\\' && cp[1] == '"')
983 cp++; /* Skip both */
984 else if (*cp == '"')
985 quoted = !quoted;
986 }
987 if (!*cp)
988 continue;
989 *cp++ = '\0';
990 }
991 }
992 /* Retry after parsing leading hostname/key options */
993 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
994 debug("%s:%lu: not a public key", path, lnum);
995 continue;
996 }
997
998 /* Find trailing comment, if any */
999 for (; *cp == ' ' || *cp == '\t'; cp++)
1000 ;
1001 if (*cp != '\0' && *cp != '#')
1002 comment = cp;
1003
1004 fingerprint_one_key(public, comment);
1005 sshkey_free(public);
1006 invalid = 0; /* One good key in the file is sufficient */
1007 }
1008 fclose(f);
1009 free(line);
1010
1011 if (invalid)
1012 fatal("%s is not a public key file.", path);
1013 exit(0);
1014 }
1015
1016 static void
1017 do_gen_all_hostkeys(struct passwd *pw)
1018 {
1019 struct {
1020 char *key_type;
1021 char *key_type_display;
1022 char *path;
1023 } key_types[] = {
1024 #ifdef WITH_OPENSSL
1025 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
1026 { "dsa", "DSA", _PATH_HOST_DSA_KEY_FILE },
1027 #ifdef OPENSSL_HAS_ECC
1028 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
1029 #endif /* OPENSSL_HAS_ECC */
1030 #endif /* WITH_OPENSSL */
1031 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
1032 #ifdef WITH_XMSS
1033 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE },
1034 #endif /* WITH_XMSS */
1035 { NULL, NULL, NULL }
1036 };
1037
1038 u_int32_t bits = 0;
1039 int first = 0;
1040 struct stat st;
1041 struct sshkey *private, *public;
1042 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1043 int i, type, fd, r;
1044 FILE *f;
1045
1046 for (i = 0; key_types[i].key_type; i++) {
1047 public = private = NULL;
1048 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1049
1050 xasprintf(&prv_file, "%s%s",
1051 identity_file, key_types[i].path);
1052
1053 /* Check whether private key exists and is not zero-length */
1054 if (stat(prv_file, &st) == 0) {
1055 if (st.st_size != 0)
1056 goto next;
1057 } else if (errno != ENOENT) {
1058 error("Could not stat %s: %s", key_types[i].path,
1059 strerror(errno));
1060 goto failnext;
1061 }
1062
1063 /*
1064 * Private key doesn't exist or is invalid; proceed with
1065 * key generation.
1066 */
1067 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1068 identity_file, key_types[i].path);
1069 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1070 identity_file, key_types[i].path);
1071 xasprintf(&pub_file, "%s%s.pub",
1072 identity_file, key_types[i].path);
1073
1074 if (first == 0) {
1075 first = 1;
1076 printf("%s: generating new host keys: ", __progname);
1077 }
1078 printf("%s ", key_types[i].key_type_display);
1079 fflush(stdout);
1080 type = sshkey_type_from_name(key_types[i].key_type);
1081 if ((fd = mkstemp(prv_tmp)) == -1) {
1082 error("Could not save your public key in %s: %s",
1083 prv_tmp, strerror(errno));
1084 goto failnext;
1085 }
1086 close(fd); /* just using mkstemp() to generate/reserve a name */
1087 bits = 0;
1088 type_bits_valid(type, NULL, &bits);
1089 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1090 error("sshkey_generate failed: %s", ssh_err(r));
1091 goto failnext;
1092 }
1093 if ((r = sshkey_from_private(private, &public)) != 0)
1094 fatal("sshkey_from_private failed: %s", ssh_err(r));
1095 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1096 hostname);
1097 if ((r = sshkey_save_private(private, prv_tmp, "",
1098 comment, private_key_format, openssh_format_cipher,
1099 rounds)) != 0) {
1100 error("Saving key \"%s\" failed: %s",
1101 prv_tmp, ssh_err(r));
1102 goto failnext;
1103 }
1104 if ((fd = mkstemp(pub_tmp)) == -1) {
1105 error("Could not save your public key in %s: %s",
1106 pub_tmp, strerror(errno));
1107 goto failnext;
1108 }
1109 (void)fchmod(fd, 0644);
1110 f = fdopen(fd, "w");
1111 if (f == NULL) {
1112 error("fdopen %s failed: %s", pub_tmp, strerror(errno));
1113 close(fd);
1114 goto failnext;
1115 }
1116 if ((r = sshkey_write(public, f)) != 0) {
1117 error("write key failed: %s", ssh_err(r));
1118 fclose(f);
1119 goto failnext;
1120 }
1121 fprintf(f, " %s\n", comment);
1122 if (ferror(f) != 0) {
1123 error("write key failed: %s", strerror(errno));
1124 fclose(f);
1125 goto failnext;
1126 }
1127 if (fclose(f) != 0) {
1128 error("key close failed: %s", strerror(errno));
1129 goto failnext;
1130 }
1131
1132 /* Rename temporary files to their permanent locations. */
1133 if (rename(pub_tmp, pub_file) != 0) {
1134 error("Unable to move %s into position: %s",
1135 pub_file, strerror(errno));
1136 goto failnext;
1137 }
1138 if (rename(prv_tmp, prv_file) != 0) {
1139 error("Unable to move %s into position: %s",
1140 key_types[i].path, strerror(errno));
1141 failnext:
1142 first = 0;
1143 goto next;
1144 }
1145 next:
1146 sshkey_free(private);
1147 sshkey_free(public);
1148 free(prv_tmp);
1149 free(pub_tmp);
1150 free(prv_file);
1151 free(pub_file);
1152 }
1153 if (first != 0)
1154 printf("\n");
1155 }
1156
1157 struct known_hosts_ctx {
1158 const char *host; /* Hostname searched for in find/delete case */
1159 FILE *out; /* Output file, stdout for find_hosts case */
1160 int has_unhashed; /* When hashing, original had unhashed hosts */
1161 int found_key; /* For find/delete, host was found */
1162 int invalid; /* File contained invalid items; don't delete */
1163 int hash_hosts; /* Hash hostnames as we go */
1164 int find_host; /* Search for specific hostname */
1165 int delete_host; /* Delete host from known_hosts */
1166 };
1167
1168 static int
1169 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1170 {
1171 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1172 char *hashed, *cp, *hosts, *ohosts;
1173 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1174 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1175
1176 switch (l->status) {
1177 case HKF_STATUS_OK:
1178 case HKF_STATUS_MATCHED:
1179 /*
1180 * Don't hash hosts already already hashed, with wildcard
1181 * characters or a CA/revocation marker.
1182 */
1183 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1184 fprintf(ctx->out, "%s\n", l->line);
1185 if (has_wild && !ctx->find_host) {
1186 logit("%s:%lu: ignoring host name "
1187 "with wildcard: %.64s", l->path,
1188 l->linenum, l->hosts);
1189 }
1190 return 0;
1191 }
1192 /*
1193 * Split any comma-separated hostnames from the host list,
1194 * hash and store separately.
1195 */
1196 ohosts = hosts = xstrdup(l->hosts);
1197 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1198 lowercase(cp);
1199 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1200 fatal("hash_host failed");
1201 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1202 ctx->has_unhashed = 1;
1203 }
1204 free(ohosts);
1205 return 0;
1206 case HKF_STATUS_INVALID:
1207 /* Retain invalid lines, but mark file as invalid. */
1208 ctx->invalid = 1;
1209 logit("%s:%lu: invalid line", l->path, l->linenum);
1210 /* FALLTHROUGH */
1211 default:
1212 fprintf(ctx->out, "%s\n", l->line);
1213 return 0;
1214 }
1215 /* NOTREACHED */
1216 return -1;
1217 }
1218
1219 static int
1220 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1221 {
1222 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1223 enum sshkey_fp_rep rep;
1224 int fptype;
1225 char *fp = NULL, *ra = NULL;
1226
1227 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1228 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1229
1230 if (l->status == HKF_STATUS_MATCHED) {
1231 if (ctx->delete_host) {
1232 if (l->marker != MRK_NONE) {
1233 /* Don't remove CA and revocation lines */
1234 fprintf(ctx->out, "%s\n", l->line);
1235 } else {
1236 /*
1237 * Hostname matches and has no CA/revoke
1238 * marker, delete it by *not* writing the
1239 * line to ctx->out.
1240 */
1241 ctx->found_key = 1;
1242 if (!quiet)
1243 printf("# Host %s found: line %lu\n",
1244 ctx->host, l->linenum);
1245 }
1246 return 0;
1247 } else if (ctx->find_host) {
1248 ctx->found_key = 1;
1249 if (!quiet) {
1250 printf("# Host %s found: line %lu %s\n",
1251 ctx->host,
1252 l->linenum, l->marker == MRK_CA ? "CA" :
1253 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1254 }
1255 if (ctx->hash_hosts)
1256 known_hosts_hash(l, ctx);
1257 else if (print_fingerprint) {
1258 fp = sshkey_fingerprint(l->key, fptype, rep);
1259 ra = sshkey_fingerprint(l->key,
1260 fingerprint_hash, SSH_FP_RANDOMART);
1261 if (fp == NULL || ra == NULL)
1262 fatal("%s: sshkey_fingerprint failed",
1263 __func__);
1264 mprintf("%s %s %s %s\n", ctx->host,
1265 sshkey_type(l->key), fp, l->comment);
1266 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
1267 printf("%s\n", ra);
1268 free(ra);
1269 free(fp);
1270 } else
1271 fprintf(ctx->out, "%s\n", l->line);
1272 return 0;
1273 }
1274 } else if (ctx->delete_host) {
1275 /* Retain non-matching hosts when deleting */
1276 if (l->status == HKF_STATUS_INVALID) {
1277 ctx->invalid = 1;
1278 logit("%s:%lu: invalid line", l->path, l->linenum);
1279 }
1280 fprintf(ctx->out, "%s\n", l->line);
1281 }
1282 return 0;
1283 }
1284
1285 static void
1286 do_known_hosts(struct passwd *pw, const char *name, int find_host,
1287 int delete_host, int hash_hosts)
1288 {
1289 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1290 int r, fd, oerrno, inplace = 0;
1291 struct known_hosts_ctx ctx;
1292 u_int foreach_options;
1293
1294 if (!have_identity) {
1295 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1296 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1297 sizeof(identity_file))
1298 fatal("Specified known hosts path too long");
1299 free(cp);
1300 have_identity = 1;
1301 }
1302
1303 memset(&ctx, 0, sizeof(ctx));
1304 ctx.out = stdout;
1305 ctx.host = name;
1306 ctx.hash_hosts = hash_hosts;
1307 ctx.find_host = find_host;
1308 ctx.delete_host = delete_host;
1309
1310 /*
1311 * Find hosts goes to stdout, hash and deletions happen in-place
1312 * A corner case is ssh-keygen -HF foo, which should go to stdout
1313 */
1314 if (!find_host && (hash_hosts || delete_host)) {
1315 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1316 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1317 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1318 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1319 fatal("known_hosts path too long");
1320 umask(077);
1321 if ((fd = mkstemp(tmp)) == -1)
1322 fatal("mkstemp: %s", strerror(errno));
1323 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1324 oerrno = errno;
1325 unlink(tmp);
1326 fatal("fdopen: %s", strerror(oerrno));
1327 }
1328 inplace = 1;
1329 }
1330 /* XXX support identity_file == "-" for stdin */
1331 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1332 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1333 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ?
1334 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL,
1335 foreach_options)) != 0) {
1336 if (inplace)
1337 unlink(tmp);
1338 fatal("%s: hostkeys_foreach failed: %s", __func__, ssh_err(r));
1339 }
1340
1341 if (inplace)
1342 fclose(ctx.out);
1343
1344 if (ctx.invalid) {
1345 error("%s is not a valid known_hosts file.", identity_file);
1346 if (inplace) {
1347 error("Not replacing existing known_hosts "
1348 "file because of errors");
1349 unlink(tmp);
1350 }
1351 exit(1);
1352 } else if (delete_host && !ctx.found_key) {
1353 logit("Host %s not found in %s", name, identity_file);
1354 if (inplace)
1355 unlink(tmp);
1356 } else if (inplace) {
1357 /* Backup existing file */
1358 if (unlink(old) == -1 && errno != ENOENT)
1359 fatal("unlink %.100s: %s", old, strerror(errno));
1360 if (link(identity_file, old) == -1)
1361 fatal("link %.100s to %.100s: %s", identity_file, old,
1362 strerror(errno));
1363 /* Move new one into place */
1364 if (rename(tmp, identity_file) == -1) {
1365 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1366 strerror(errno));
1367 unlink(tmp);
1368 unlink(old);
1369 exit(1);
1370 }
1371
1372 printf("%s updated.\n", identity_file);
1373 printf("Original contents retained as %s\n", old);
1374 if (ctx.has_unhashed) {
1375 logit("WARNING: %s contains unhashed entries", old);
1376 logit("Delete this file to ensure privacy "
1377 "of hostnames");
1378 }
1379 }
1380
1381 exit (find_host && !ctx.found_key);
1382 }
1383
1384 /*
1385 * Perform changing a passphrase. The argument is the passwd structure
1386 * for the current user.
1387 */
1388 static void
1389 do_change_passphrase(struct passwd *pw)
1390 {
1391 char *comment;
1392 char *old_passphrase, *passphrase1, *passphrase2;
1393 struct stat st;
1394 struct sshkey *private;
1395 int r;
1396
1397 if (!have_identity)
1398 ask_filename(pw, "Enter file in which the key is");
1399 if (stat(identity_file, &st) == -1)
1400 fatal("%s: %s", identity_file, strerror(errno));
1401 /* Try to load the file with empty passphrase. */
1402 r = sshkey_load_private(identity_file, "", &private, &comment);
1403 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1404 if (identity_passphrase)
1405 old_passphrase = xstrdup(identity_passphrase);
1406 else
1407 old_passphrase =
1408 read_passphrase("Enter old passphrase: ",
1409 RP_ALLOW_STDIN);
1410 r = sshkey_load_private(identity_file, old_passphrase,
1411 &private, &comment);
1412 explicit_bzero(old_passphrase, strlen(old_passphrase));
1413 free(old_passphrase);
1414 if (r != 0)
1415 goto badkey;
1416 } else if (r != 0) {
1417 badkey:
1418 fatal("Failed to load key %s: %s", identity_file, ssh_err(r));
1419 }
1420 if (comment)
1421 mprintf("Key has comment '%s'\n", comment);
1422
1423 /* Ask the new passphrase (twice). */
1424 if (identity_new_passphrase) {
1425 passphrase1 = xstrdup(identity_new_passphrase);
1426 passphrase2 = NULL;
1427 } else {
1428 passphrase1 =
1429 read_passphrase("Enter new passphrase (empty for no "
1430 "passphrase): ", RP_ALLOW_STDIN);
1431 passphrase2 = read_passphrase("Enter same passphrase again: ",
1432 RP_ALLOW_STDIN);
1433
1434 /* Verify that they are the same. */
1435 if (strcmp(passphrase1, passphrase2) != 0) {
1436 explicit_bzero(passphrase1, strlen(passphrase1));
1437 explicit_bzero(passphrase2, strlen(passphrase2));
1438 free(passphrase1);
1439 free(passphrase2);
1440 printf("Pass phrases do not match. Try again.\n");
1441 exit(1);
1442 }
1443 /* Destroy the other copy. */
1444 explicit_bzero(passphrase2, strlen(passphrase2));
1445 free(passphrase2);
1446 }
1447
1448 /* Save the file using the new passphrase. */
1449 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1450 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
1451 error("Saving key \"%s\" failed: %s.",
1452 identity_file, ssh_err(r));
1453 explicit_bzero(passphrase1, strlen(passphrase1));
1454 free(passphrase1);
1455 sshkey_free(private);
1456 free(comment);
1457 exit(1);
1458 }
1459 /* Destroy the passphrase and the copy of the key in memory. */
1460 explicit_bzero(passphrase1, strlen(passphrase1));
1461 free(passphrase1);
1462 sshkey_free(private); /* Destroys contents */
1463 free(comment);
1464
1465 printf("Your identification has been saved with the new passphrase.\n");
1466 exit(0);
1467 }
1468
1469 /*
1470 * Print the SSHFP RR.
1471 */
1472 static int
1473 do_print_resource_record(struct passwd *pw, char *fname, char *hname,
1474 int print_generic)
1475 {
1476 struct sshkey *public;
1477 char *comment = NULL;
1478 struct stat st;
1479 int r;
1480
1481 if (fname == NULL)
1482 fatal("%s: no filename", __func__);
1483 if (stat(fname, &st) == -1) {
1484 if (errno == ENOENT)
1485 return 0;
1486 fatal("%s: %s", fname, strerror(errno));
1487 }
1488 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1489 fatal("Failed to read v2 public key from \"%s\": %s.",
1490 fname, ssh_err(r));
1491 export_dns_rr(hname, public, stdout, print_generic);
1492 sshkey_free(public);
1493 free(comment);
1494 return 1;
1495 }
1496
1497 /*
1498 * Change the comment of a private key file.
1499 */
1500 static void
1501 do_change_comment(struct passwd *pw, const char *identity_comment)
1502 {
1503 char new_comment[1024], *comment, *passphrase;
1504 struct sshkey *private;
1505 struct sshkey *public;
1506 struct stat st;
1507 FILE *f;
1508 int r, fd;
1509
1510 if (!have_identity)
1511 ask_filename(pw, "Enter file in which the key is");
1512 if (stat(identity_file, &st) == -1)
1513 fatal("%s: %s", identity_file, strerror(errno));
1514 if ((r = sshkey_load_private(identity_file, "",
1515 &private, &comment)) == 0)
1516 passphrase = xstrdup("");
1517 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1518 fatal("Cannot load private key \"%s\": %s.",
1519 identity_file, ssh_err(r));
1520 else {
1521 if (identity_passphrase)
1522 passphrase = xstrdup(identity_passphrase);
1523 else if (identity_new_passphrase)
1524 passphrase = xstrdup(identity_new_passphrase);
1525 else
1526 passphrase = read_passphrase("Enter passphrase: ",
1527 RP_ALLOW_STDIN);
1528 /* Try to load using the passphrase. */
1529 if ((r = sshkey_load_private(identity_file, passphrase,
1530 &private, &comment)) != 0) {
1531 explicit_bzero(passphrase, strlen(passphrase));
1532 free(passphrase);
1533 fatal("Cannot load private key \"%s\": %s.",
1534 identity_file, ssh_err(r));
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("Saving key \"%s\" failed: %s",
1576 identity_file, ssh_err(r));
1577 explicit_bzero(passphrase, strlen(passphrase));
1578 free(passphrase);
1579 sshkey_free(private);
1580 free(comment);
1581 exit(1);
1582 }
1583 explicit_bzero(passphrase, strlen(passphrase));
1584 free(passphrase);
1585 if ((r = sshkey_from_private(private, &public)) != 0)
1586 fatal("sshkey_from_private failed: %s", ssh_err(r));
1587 sshkey_free(private);
1588
1589 strlcat(identity_file, ".pub", sizeof(identity_file));
1590 fd = open(identity_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1591 if (fd == -1)
1592 fatal("Could not save your public key in %s", identity_file);
1593 f = fdopen(fd, "w");
1594 if (f == NULL)
1595 fatal("fdopen %s failed: %s", identity_file, strerror(errno));
1596 if ((r = sshkey_write(public, f)) != 0)
1597 fatal("write key failed: %s", ssh_err(r));
1598 sshkey_free(public);
1599 fprintf(f, " %s\n", new_comment);
1600 fclose(f);
1601
1602 free(comment);
1603
1604 if (strlen(new_comment) > 0)
1605 printf("Comment '%s' applied\n", new_comment);
1606 else
1607 printf("Comment removed\n");
1608
1609 exit(0);
1610 }
1611
1612 static void
1613 add_flag_option(struct sshbuf *c, const char *name)
1614 {
1615 int r;
1616
1617 debug3("%s: %s", __func__, name);
1618 if ((r = sshbuf_put_cstring(c, name)) != 0 ||
1619 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1620 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1621 }
1622
1623 static void
1624 add_string_option(struct sshbuf *c, const char *name, const char *value)
1625 {
1626 struct sshbuf *b;
1627 int r;
1628
1629 debug3("%s: %s=%s", __func__, name, value);
1630 if ((b = sshbuf_new()) == NULL)
1631 fatal("%s: sshbuf_new failed", __func__);
1632 if ((r = sshbuf_put_cstring(b, value)) != 0 ||
1633 (r = sshbuf_put_cstring(c, name)) != 0 ||
1634 (r = sshbuf_put_stringb(c, b)) != 0)
1635 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1636
1637 sshbuf_free(b);
1638 }
1639
1640 #define OPTIONS_CRITICAL 1
1641 #define OPTIONS_EXTENSIONS 2
1642 static void
1643 prepare_options_buf(struct sshbuf *c, int which)
1644 {
1645 size_t i;
1646
1647 sshbuf_reset(c);
1648 if ((which & OPTIONS_CRITICAL) != 0 &&
1649 certflags_command != NULL)
1650 add_string_option(c, "force-command", certflags_command);
1651 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1652 (certflags_flags & CERTOPT_X_FWD) != 0)
1653 add_flag_option(c, "permit-X11-forwarding");
1654 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1655 (certflags_flags & CERTOPT_AGENT_FWD) != 0)
1656 add_flag_option(c, "permit-agent-forwarding");
1657 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1658 (certflags_flags & CERTOPT_PORT_FWD) != 0)
1659 add_flag_option(c, "permit-port-forwarding");
1660 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1661 (certflags_flags & CERTOPT_PTY) != 0)
1662 add_flag_option(c, "permit-pty");
1663 if ((which & OPTIONS_EXTENSIONS) != 0 &&
1664 (certflags_flags & CERTOPT_USER_RC) != 0)
1665 add_flag_option(c, "permit-user-rc");
1666 if ((which & OPTIONS_CRITICAL) != 0 &&
1667 (certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0)
1668 add_flag_option(c, "no-touch-required");
1669 if ((which & OPTIONS_CRITICAL) != 0 &&
1670 certflags_src_addr != NULL)
1671 add_string_option(c, "source-address", certflags_src_addr);
1672 for (i = 0; i < ncert_userext; i++) {
1673 if ((cert_userext[i].crit && (which & OPTIONS_EXTENSIONS)) ||
1674 (!cert_userext[i].crit && (which & OPTIONS_CRITICAL)))
1675 continue;
1676 if (cert_userext[i].val == NULL)
1677 add_flag_option(c, cert_userext[i].key);
1678 else {
1679 add_string_option(c, cert_userext[i].key,
1680 cert_userext[i].val);
1681 }
1682 }
1683 }
1684
1685 static struct sshkey *
1686 load_pkcs11_key(char *path)
1687 {
1688 #ifdef ENABLE_PKCS11
1689 struct sshkey **keys = NULL, *public, *private = NULL;
1690 int r, i, nkeys;
1691
1692 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1693 fatal("Couldn't load CA public key \"%s\": %s",
1694 path, ssh_err(r));
1695
1696 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase, &keys);
1697 debug3("%s: %d keys", __func__, nkeys);
1698 if (nkeys <= 0)
1699 fatal("cannot read public key from pkcs11");
1700 for (i = 0; i < nkeys; i++) {
1701 if (sshkey_equal_public(public, keys[i])) {
1702 private = keys[i];
1703 continue;
1704 }
1705 sshkey_free(keys[i]);
1706 }
1707 free(keys);
1708 sshkey_free(public);
1709 return private;
1710 #else
1711 fatal("no pkcs11 support");
1712 #endif /* ENABLE_PKCS11 */
1713 }
1714
1715 /* Signer for sshkey_certify_custom that uses the agent */
1716 static int
1717 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp,
1718 const u_char *data, size_t datalen,
1719 const char *alg, const char *provider, u_int compat, void *ctx)
1720 {
1721 int *agent_fdp = (int *)ctx;
1722
1723 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1724 data, datalen, alg, compat);
1725 }
1726
1727 static void
1728 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent,
1729 unsigned long long cert_serial, int cert_serial_autoinc,
1730 int argc, char **argv)
1731 {
1732 int r, i, fd, found, agent_fd = -1;
1733 u_int n;
1734 struct sshkey *ca, *public;
1735 char valid[64], *otmp, *tmp, *cp, *out, *comment;
1736 char *ca_fp = NULL, **plist = NULL;
1737 FILE *f;
1738 struct ssh_identitylist *agent_ids;
1739 size_t j;
1740 struct notifier_ctx *notifier = NULL;
1741
1742 #ifdef ENABLE_PKCS11
1743 pkcs11_init(1);
1744 #endif
1745 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1746 if (pkcs11provider != NULL) {
1747 /* If a PKCS#11 token was specified then try to use it */
1748 if ((ca = load_pkcs11_key(tmp)) == NULL)
1749 fatal("No PKCS#11 key matching %s found", ca_key_path);
1750 } else if (prefer_agent) {
1751 /*
1752 * Agent signature requested. Try to use agent after making
1753 * sure the public key specified is actually present in the
1754 * agent.
1755 */
1756 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1757 fatal("Cannot load CA public key %s: %s",
1758 tmp, ssh_err(r));
1759 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1760 fatal("Cannot use public key for CA signature: %s",
1761 ssh_err(r));
1762 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1763 fatal("Retrieve agent key list: %s", ssh_err(r));
1764 found = 0;
1765 for (j = 0; j < agent_ids->nkeys; j++) {
1766 if (sshkey_equal(ca, agent_ids->keys[j])) {
1767 found = 1;
1768 break;
1769 }
1770 }
1771 if (!found)
1772 fatal("CA key %s not found in agent", tmp);
1773 ssh_free_identitylist(agent_ids);
1774 ca->flags |= SSHKEY_FLAG_EXT;
1775 } else {
1776 /* CA key is assumed to be a private key on the filesystem */
1777 ca = load_identity(tmp, NULL);
1778 }
1779 free(tmp);
1780
1781 if (key_type_name != NULL &&
1782 sshkey_type_from_name(key_type_name) != ca->type) {
1783 fatal("CA key type %s doesn't match specified %s",
1784 sshkey_ssh_name(ca), key_type_name);
1785 }
1786 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT);
1787
1788 for (i = 0; i < argc; i++) {
1789 /* Split list of principals */
1790 n = 0;
1791 if (cert_principals != NULL) {
1792 otmp = tmp = xstrdup(cert_principals);
1793 plist = NULL;
1794 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1795 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1796 if (*(plist[n] = xstrdup(cp)) == '\0')
1797 fatal("Empty principal name");
1798 }
1799 free(otmp);
1800 }
1801 if (n > SSHKEY_CERT_MAX_PRINCIPALS)
1802 fatal("Too many certificate principals specified");
1803
1804 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1805 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1806 fatal("%s: unable to open \"%s\": %s",
1807 __func__, tmp, ssh_err(r));
1808 if (sshkey_is_cert(public))
1809 fatal("%s: key \"%s\" type %s cannot be certified",
1810 __func__, tmp, sshkey_type(public));
1811
1812 /* Prepare certificate to sign */
1813 if ((r = sshkey_to_certified(public)) != 0)
1814 fatal("Could not upgrade key %s to certificate: %s",
1815 tmp, ssh_err(r));
1816 public->cert->type = cert_key_type;
1817 public->cert->serial = (u_int64_t)cert_serial;
1818 public->cert->key_id = xstrdup(cert_key_id);
1819 public->cert->nprincipals = n;
1820 public->cert->principals = plist;
1821 public->cert->valid_after = cert_valid_from;
1822 public->cert->valid_before = cert_valid_to;
1823 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1824 prepare_options_buf(public->cert->extensions,
1825 OPTIONS_EXTENSIONS);
1826 if ((r = sshkey_from_private(ca,
1827 &public->cert->signature_key)) != 0)
1828 fatal("sshkey_from_private (ca key): %s", ssh_err(r));
1829
1830 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1831 if ((r = sshkey_certify_custom(public, ca,
1832 key_type_name, sk_provider, agent_signer,
1833 &agent_fd)) != 0)
1834 fatal("Couldn't certify key %s via agent: %s",
1835 tmp, ssh_err(r));
1836 } else {
1837 if (sshkey_is_sk(ca) &&
1838 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
1839 notifier = notify_start(0,
1840 "Confirm user presence for key %s %s",
1841 sshkey_type(ca), ca_fp);
1842 }
1843 r = sshkey_certify(public, ca, key_type_name,
1844 sk_provider);
1845 notify_complete(notifier);
1846 if (r != 0)
1847 fatal("Couldn't certify key %s: %s",
1848 tmp, ssh_err(r));
1849 }
1850
1851 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1852 *cp = '\0';
1853 xasprintf(&out, "%s-cert.pub", tmp);
1854 free(tmp);
1855
1856 if ((fd = open(out, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
1857 fatal("Could not open \"%s\" for writing: %s", out,
1858 strerror(errno));
1859 if ((f = fdopen(fd, "w")) == NULL)
1860 fatal("%s: fdopen: %s", __func__, strerror(errno));
1861 if ((r = sshkey_write(public, f)) != 0)
1862 fatal("Could not write certified key to %s: %s",
1863 out, ssh_err(r));
1864 fprintf(f, " %s\n", comment);
1865 fclose(f);
1866
1867 if (!quiet) {
1868 sshkey_format_cert_validity(public->cert,
1869 valid, sizeof(valid));
1870 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1871 "valid %s", sshkey_cert_type(public),
1872 out, public->cert->key_id,
1873 (unsigned long long)public->cert->serial,
1874 cert_principals != NULL ? " for " : "",
1875 cert_principals != NULL ? cert_principals : "",
1876 valid);
1877 }
1878
1879 sshkey_free(public);
1880 free(out);
1881 if (cert_serial_autoinc)
1882 cert_serial++;
1883 }
1884 free(ca_fp);
1885 #ifdef ENABLE_PKCS11
1886 pkcs11_terminate();
1887 #endif
1888 exit(0);
1889 }
1890
1891 static u_int64_t
1892 parse_relative_time(const char *s, time_t now)
1893 {
1894 int64_t mul, secs;
1895
1896 mul = *s == '-' ? -1 : 1;
1897
1898 if ((secs = convtime(s + 1)) == -1)
1899 fatal("Invalid relative certificate time %s", s);
1900 if (mul == -1 && secs > now)
1901 fatal("Certificate time %s cannot be represented", s);
1902 return now + (u_int64_t)(secs * mul);
1903 }
1904
1905 static void
1906 parse_cert_times(char *timespec)
1907 {
1908 char *from, *to;
1909 time_t now = time(NULL);
1910 int64_t secs;
1911
1912 /* +timespec relative to now */
1913 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1914 if ((secs = convtime(timespec + 1)) == -1)
1915 fatal("Invalid relative certificate life %s", timespec);
1916 cert_valid_to = now + secs;
1917 /*
1918 * Backdate certificate one minute to avoid problems on hosts
1919 * with poorly-synchronised clocks.
1920 */
1921 cert_valid_from = ((now - 59)/ 60) * 60;
1922 return;
1923 }
1924
1925 /*
1926 * from:to, where
1927 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "always"
1928 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | "forever"
1929 */
1930 from = xstrdup(timespec);
1931 to = strchr(from, ':');
1932 if (to == NULL || from == to || *(to + 1) == '\0')
1933 fatal("Invalid certificate life specification %s", timespec);
1934 *to++ = '\0';
1935
1936 if (*from == '-' || *from == '+')
1937 cert_valid_from = parse_relative_time(from, now);
1938 else if (strcmp(from, "always") == 0)
1939 cert_valid_from = 0;
1940 else if (parse_absolute_time(from, &cert_valid_from) != 0)
1941 fatal("Invalid from time \"%s\"", from);
1942
1943 if (*to == '-' || *to == '+')
1944 cert_valid_to = parse_relative_time(to, now);
1945 else if (strcmp(to, "forever") == 0)
1946 cert_valid_to = ~(u_int64_t)0;
1947 else if (parse_absolute_time(to, &cert_valid_to) != 0)
1948 fatal("Invalid to time \"%s\"", to);
1949
1950 if (cert_valid_to <= cert_valid_from)
1951 fatal("Empty certificate validity interval");
1952 free(from);
1953 }
1954
1955 static void
1956 add_cert_option(char *opt)
1957 {
1958 char *val, *cp;
1959 int iscrit = 0;
1960
1961 if (strcasecmp(opt, "clear") == 0)
1962 certflags_flags = 0;
1963 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1964 certflags_flags &= ~CERTOPT_X_FWD;
1965 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1966 certflags_flags |= CERTOPT_X_FWD;
1967 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
1968 certflags_flags &= ~CERTOPT_AGENT_FWD;
1969 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
1970 certflags_flags |= CERTOPT_AGENT_FWD;
1971 else if (strcasecmp(opt, "no-port-forwarding") == 0)
1972 certflags_flags &= ~CERTOPT_PORT_FWD;
1973 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
1974 certflags_flags |= CERTOPT_PORT_FWD;
1975 else if (strcasecmp(opt, "no-pty") == 0)
1976 certflags_flags &= ~CERTOPT_PTY;
1977 else if (strcasecmp(opt, "permit-pty") == 0)
1978 certflags_flags |= CERTOPT_PTY;
1979 else if (strcasecmp(opt, "no-user-rc") == 0)
1980 certflags_flags &= ~CERTOPT_USER_RC;
1981 else if (strcasecmp(opt, "permit-user-rc") == 0)
1982 certflags_flags |= CERTOPT_USER_RC;
1983 else if (strcasecmp(opt, "touch-required") == 0)
1984 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE;
1985 else if (strcasecmp(opt, "no-touch-required") == 0)
1986 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE;
1987 else if (strncasecmp(opt, "force-command=", 14) == 0) {
1988 val = opt + 14;
1989 if (*val == '\0')
1990 fatal("Empty force-command option");
1991 if (certflags_command != NULL)
1992 fatal("force-command already specified");
1993 certflags_command = xstrdup(val);
1994 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
1995 val = opt + 15;
1996 if (*val == '\0')
1997 fatal("Empty source-address option");
1998 if (certflags_src_addr != NULL)
1999 fatal("source-address already specified");
2000 if (addr_match_cidr_list(NULL, val) != 0)
2001 fatal("Invalid source-address list");
2002 certflags_src_addr = xstrdup(val);
2003 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
2004 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
2005 val = xstrdup(strchr(opt, ':') + 1);
2006 if ((cp = strchr(val, '=')) != NULL)
2007 *cp++ = '\0';
2008 cert_userext = xreallocarray(cert_userext, ncert_userext + 1,
2009 sizeof(*cert_userext));
2010 cert_userext[ncert_userext].key = val;
2011 cert_userext[ncert_userext].val = cp == NULL ?
2012 NULL : xstrdup(cp);
2013 cert_userext[ncert_userext].crit = iscrit;
2014 ncert_userext++;
2015 } else
2016 fatal("Unsupported certificate option \"%s\"", opt);
2017 }
2018
2019 static void
2020 show_options(struct sshbuf *optbuf, int in_critical)
2021 {
2022 char *name, *arg;
2023 struct sshbuf *options, *option = NULL;
2024 int r;
2025
2026 if ((options = sshbuf_fromb(optbuf)) == NULL)
2027 fatal("%s: sshbuf_fromb failed", __func__);
2028 while (sshbuf_len(options) != 0) {
2029 sshbuf_free(option);
2030 option = NULL;
2031 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
2032 (r = sshbuf_froms(options, &option)) != 0)
2033 fatal("%s: buffer error: %s", __func__, ssh_err(r));
2034 printf(" %s", name);
2035 if (!in_critical &&
2036 (strcmp(name, "permit-X11-forwarding") == 0 ||
2037 strcmp(name, "permit-agent-forwarding") == 0 ||
2038 strcmp(name, "permit-port-forwarding") == 0 ||
2039 strcmp(name, "permit-pty") == 0 ||
2040 strcmp(name, "permit-user-rc") == 0 ||
2041 strcmp(name, "no-touch-required") == 0)) {
2042 printf("\n");
2043 } else if (in_critical &&
2044 (strcmp(name, "force-command") == 0 ||
2045 strcmp(name, "source-address") == 0)) {
2046 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
2047 fatal("%s: buffer error: %s",
2048 __func__, ssh_err(r));
2049 printf(" %s\n", arg);
2050 free(arg);
2051 } else {
2052 printf(" UNKNOWN OPTION (len %zu)\n",
2053 sshbuf_len(option));
2054 sshbuf_reset(option);
2055 }
2056 free(name);
2057 if (sshbuf_len(option) != 0)
2058 fatal("Option corrupt: extra data at end");
2059 }
2060 sshbuf_free(option);
2061 sshbuf_free(options);
2062 }
2063
2064 static void
2065 print_cert(struct sshkey *key)
2066 {
2067 char valid[64], *key_fp, *ca_fp;
2068 u_int i;
2069
2070 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2071 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2072 fingerprint_hash, SSH_FP_DEFAULT);
2073 if (key_fp == NULL || ca_fp == NULL)
2074 fatal("%s: sshkey_fingerprint fail", __func__);
2075 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2076
2077 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2078 sshkey_cert_type(key));
2079 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2080 printf(" Signing CA: %s %s (using %s)\n",
2081 sshkey_type(key->cert->signature_key), ca_fp,
2082 key->cert->signature_type);
2083 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2084 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2085 printf(" Valid: %s\n", valid);
2086 printf(" Principals: ");
2087 if (key->cert->nprincipals == 0)
2088 printf("(none)\n");
2089 else {
2090 for (i = 0; i < key->cert->nprincipals; i++)
2091 printf("\n %s",
2092 key->cert->principals[i]);
2093 printf("\n");
2094 }
2095 printf(" Critical Options: ");
2096 if (sshbuf_len(key->cert->critical) == 0)
2097 printf("(none)\n");
2098 else {
2099 printf("\n");
2100 show_options(key->cert->critical, 1);
2101 }
2102 printf(" Extensions: ");
2103 if (sshbuf_len(key->cert->extensions) == 0)
2104 printf("(none)\n");
2105 else {
2106 printf("\n");
2107 show_options(key->cert->extensions, 0);
2108 }
2109 }
2110
2111 static void
2112 do_show_cert(struct passwd *pw)
2113 {
2114 struct sshkey *key = NULL;
2115 struct stat st;
2116 int r, is_stdin = 0, ok = 0;
2117 FILE *f;
2118 char *cp, *line = NULL;
2119 const char *path;
2120 size_t linesize = 0;
2121 u_long lnum = 0;
2122
2123 if (!have_identity)
2124 ask_filename(pw, "Enter file in which the key is");
2125 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1)
2126 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2127
2128 path = identity_file;
2129 if (strcmp(path, "-") == 0) {
2130 f = stdin;
2131 path = "(stdin)";
2132 is_stdin = 1;
2133 } else if ((f = fopen(identity_file, "r")) == NULL)
2134 fatal("fopen %s: %s", identity_file, strerror(errno));
2135
2136 while (getline(&line, &linesize, f) != -1) {
2137 lnum++;
2138 sshkey_free(key);
2139 key = NULL;
2140 /* Trim leading space and comments */
2141 cp = line + strspn(line, " \t");
2142 if (*cp == '#' || *cp == '\0')
2143 continue;
2144 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2145 fatal("sshkey_new");
2146 if ((r = sshkey_read(key, &cp)) != 0) {
2147 error("%s:%lu: invalid key: %s", path,
2148 lnum, ssh_err(r));
2149 continue;
2150 }
2151 if (!sshkey_is_cert(key)) {
2152 error("%s:%lu is not a certificate", path, lnum);
2153 continue;
2154 }
2155 ok = 1;
2156 if (!is_stdin && lnum == 1)
2157 printf("%s:\n", path);
2158 else
2159 printf("%s:%lu:\n", path, lnum);
2160 print_cert(key);
2161 }
2162 free(line);
2163 sshkey_free(key);
2164 fclose(f);
2165 exit(ok ? 0 : 1);
2166 }
2167
2168 static void
2169 load_krl(const char *path, struct ssh_krl **krlp)
2170 {
2171 struct sshbuf *krlbuf;
2172 int r, fd;
2173
2174 if ((krlbuf = sshbuf_new()) == NULL)
2175 fatal("sshbuf_new failed");
2176 if ((fd = open(path, O_RDONLY)) == -1)
2177 fatal("open %s: %s", path, strerror(errno));
2178 if ((r = sshkey_load_file(fd, krlbuf)) != 0)
2179 fatal("Unable to load KRL: %s", ssh_err(r));
2180 close(fd);
2181 /* XXX check sigs */
2182 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 ||
2183 *krlp == NULL)
2184 fatal("Invalid KRL file: %s", ssh_err(r));
2185 sshbuf_free(krlbuf);
2186 }
2187
2188 static void
2189 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp,
2190 const char *file, u_long lnum)
2191 {
2192 char *tmp;
2193 size_t tlen;
2194 struct sshbuf *b;
2195 int r;
2196
2197 if (strncmp(cp, "SHA256:", 7) != 0)
2198 fatal("%s:%lu: unsupported hash algorithm", file, lnum);
2199 cp += 7;
2200
2201 /*
2202 * OpenSSH base64 hashes omit trailing '='
2203 * characters; put them back for decode.
2204 */
2205 tlen = strlen(cp);
2206 tmp = xmalloc(tlen + 4 + 1);
2207 strlcpy(tmp, cp, tlen + 1);
2208 while ((tlen % 4) != 0) {
2209 tmp[tlen++] = '=';
2210 tmp[tlen] = '\0';
2211 }
2212 if ((b = sshbuf_new()) == NULL)
2213 fatal("%s: sshbuf_new failed", __func__);
2214 if ((r = sshbuf_b64tod(b, tmp)) != 0)
2215 fatal("%s:%lu: decode hash failed: %s", file, lnum, ssh_err(r));
2216 free(tmp);
2217 *lenp = sshbuf_len(b);
2218 *blobp = xmalloc(*lenp);
2219 memcpy(*blobp, sshbuf_ptr(b), *lenp);
2220 sshbuf_free(b);
2221 }
2222
2223 static void
2224 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2225 const struct sshkey *ca, struct ssh_krl *krl)
2226 {
2227 struct sshkey *key = NULL;
2228 u_long lnum = 0;
2229 char *path, *cp, *ep, *line = NULL;
2230 u_char *blob = NULL;
2231 size_t blen = 0, linesize = 0;
2232 unsigned long long serial, serial2;
2233 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r;
2234 FILE *krl_spec;
2235
2236 path = tilde_expand_filename(file, pw->pw_uid);
2237 if (strcmp(path, "-") == 0) {
2238 krl_spec = stdin;
2239 free(path);
2240 path = xstrdup("(standard input)");
2241 } else if ((krl_spec = fopen(path, "r")) == NULL)
2242 fatal("fopen %s: %s", path, strerror(errno));
2243
2244 if (!quiet)
2245 printf("Revoking from %s\n", path);
2246 while (getline(&line, &linesize, krl_spec) != -1) {
2247 lnum++;
2248 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0;
2249 cp = line + strspn(line, " \t");
2250 /* Trim trailing space, comments and strip \n */
2251 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2252 if (cp[i] == '#' || cp[i] == '\n') {
2253 cp[i] = '\0';
2254 break;
2255 }
2256 if (cp[i] == ' ' || cp[i] == '\t') {
2257 /* Remember the start of a span of whitespace */
2258 if (r == -1)
2259 r = i;
2260 } else
2261 r = -1;
2262 }
2263 if (r != -1)
2264 cp[r] = '\0';
2265 if (*cp == '\0')
2266 continue;
2267 if (strncasecmp(cp, "serial:", 7) == 0) {
2268 if (ca == NULL && !wild_ca) {
2269 fatal("revoking certificates by serial number "
2270 "requires specification of a CA key");
2271 }
2272 cp += 7;
2273 cp = cp + strspn(cp, " \t");
2274 errno = 0;
2275 serial = strtoull(cp, &ep, 0);
2276 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2277 fatal("%s:%lu: invalid serial \"%s\"",
2278 path, lnum, cp);
2279 if (errno == ERANGE && serial == ULLONG_MAX)
2280 fatal("%s:%lu: serial out of range",
2281 path, lnum);
2282 serial2 = serial;
2283 if (*ep == '-') {
2284 cp = ep + 1;
2285 errno = 0;
2286 serial2 = strtoull(cp, &ep, 0);
2287 if (*cp == '\0' || *ep != '\0')
2288 fatal("%s:%lu: invalid serial \"%s\"",
2289 path, lnum, cp);
2290 if (errno == ERANGE && serial2 == ULLONG_MAX)
2291 fatal("%s:%lu: serial out of range",
2292 path, lnum);
2293 if (serial2 <= serial)
2294 fatal("%s:%lu: invalid serial range "
2295 "%llu:%llu", path, lnum,
2296 (unsigned long long)serial,
2297 (unsigned long long)serial2);
2298 }
2299 if (ssh_krl_revoke_cert_by_serial_range(krl,
2300 ca, serial, serial2) != 0) {
2301 fatal("%s: revoke serial failed",
2302 __func__);
2303 }
2304 } else if (strncasecmp(cp, "id:", 3) == 0) {
2305 if (ca == NULL && !wild_ca) {
2306 fatal("revoking certificates by key ID "
2307 "requires specification of a CA key");
2308 }
2309 cp += 3;
2310 cp = cp + strspn(cp, " \t");
2311 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2312 fatal("%s: revoke key ID failed", __func__);
2313 } else if (strncasecmp(cp, "hash:", 5) == 0) {
2314 cp += 5;
2315 cp = cp + strspn(cp, " \t");
2316 hash_to_blob(cp, &blob, &blen, file, lnum);
2317 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
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("%s:%lu: invalid key: %s",
2340 path, lnum, ssh_err(r));
2341 if (was_explicit_key)
2342 r = ssh_krl_revoke_key_explicit(krl, key);
2343 else if (was_sha1) {
2344 if (sshkey_fingerprint_raw(key,
2345 SSH_DIGEST_SHA1, &blob, &blen) != 0) {
2346 fatal("%s:%lu: fingerprint failed",
2347 file, lnum);
2348 }
2349 r = ssh_krl_revoke_key_sha1(krl, blob, blen);
2350 } else if (was_sha256) {
2351 if (sshkey_fingerprint_raw(key,
2352 SSH_DIGEST_SHA256, &blob, &blen) != 0) {
2353 fatal("%s:%lu: fingerprint failed",
2354 file, lnum);
2355 }
2356 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2357 } else
2358 r = ssh_krl_revoke_key(krl, key);
2359 if (r != 0)
2360 fatal("%s: revoke key failed: %s",
2361 __func__, ssh_err(r));
2362 freezero(blob, blen);
2363 blob = NULL;
2364 blen = 0;
2365 sshkey_free(key);
2366 }
2367 }
2368 if (strcmp(path, "-") != 0)
2369 fclose(krl_spec);
2370 free(line);
2371 free(path);
2372 }
2373
2374 static void
2375 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path,
2376 unsigned long long krl_version, const char *krl_comment,
2377 int argc, char **argv)
2378 {
2379 struct ssh_krl *krl;
2380 struct stat sb;
2381 struct sshkey *ca = NULL;
2382 int fd, i, r, wild_ca = 0;
2383 char *tmp;
2384 struct sshbuf *kbuf;
2385
2386 if (*identity_file == '\0')
2387 fatal("KRL generation requires an output file");
2388 if (stat(identity_file, &sb) == -1) {
2389 if (errno != ENOENT)
2390 fatal("Cannot access KRL \"%s\": %s",
2391 identity_file, strerror(errno));
2392 if (updating)
2393 fatal("KRL \"%s\" does not exist", identity_file);
2394 }
2395 if (ca_key_path != NULL) {
2396 if (strcasecmp(ca_key_path, "none") == 0)
2397 wild_ca = 1;
2398 else {
2399 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2400 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2401 fatal("Cannot load CA public key %s: %s",
2402 tmp, ssh_err(r));
2403 free(tmp);
2404 }
2405 }
2406
2407 if (updating)
2408 load_krl(identity_file, &krl);
2409 else if ((krl = ssh_krl_init()) == NULL)
2410 fatal("couldn't create KRL");
2411
2412 if (krl_version != 0)
2413 ssh_krl_set_version(krl, krl_version);
2414 if (krl_comment != NULL)
2415 ssh_krl_set_comment(krl, krl_comment);
2416
2417 for (i = 0; i < argc; i++)
2418 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2419
2420 if ((kbuf = sshbuf_new()) == NULL)
2421 fatal("sshbuf_new failed");
2422 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0)
2423 fatal("Couldn't generate KRL");
2424 if ((fd = open(identity_file, O_WRONLY|O_CREAT|O_TRUNC, 0644)) == -1)
2425 fatal("open %s: %s", identity_file, strerror(errno));
2426 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(kbuf), sshbuf_len(kbuf)) !=
2427 sshbuf_len(kbuf))
2428 fatal("write %s: %s", identity_file, strerror(errno));
2429 close(fd);
2430 sshbuf_free(kbuf);
2431 ssh_krl_free(krl);
2432 sshkey_free(ca);
2433 }
2434
2435 static void
2436 do_check_krl(struct passwd *pw, int argc, char **argv)
2437 {
2438 int i, r, ret = 0;
2439 char *comment;
2440 struct ssh_krl *krl;
2441 struct sshkey *k;
2442
2443 if (*identity_file == '\0')
2444 fatal("KRL checking requires an input file");
2445 load_krl(identity_file, &krl);
2446 for (i = 0; i < argc; i++) {
2447 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2448 fatal("Cannot load public key %s: %s",
2449 argv[i], ssh_err(r));
2450 r = ssh_krl_check_key(krl, k);
2451 printf("%s%s%s%s: %s\n", argv[i],
2452 *comment ? " (" : "", comment, *comment ? ")" : "",
2453 r == 0 ? "ok" : "REVOKED");
2454 if (r != 0)
2455 ret = 1;
2456 sshkey_free(k);
2457 free(comment);
2458 }
2459 ssh_krl_free(krl);
2460 exit(ret);
2461 }
2462
2463 static struct sshkey *
2464 load_sign_key(const char *keypath, const struct sshkey *pubkey)
2465 {
2466 size_t i, slen, plen = strlen(keypath);
2467 char *privpath = xstrdup(keypath);
2468 const char *suffixes[] = { "-cert.pub", ".pub", NULL };
2469 struct sshkey *ret = NULL, *privkey = NULL;
2470 int r;
2471
2472 /*
2473 * If passed a public key filename, then try to locate the correponding
2474 * private key. This lets us specify certificates on the command-line
2475 * and have ssh-keygen find the appropriate private key.
2476 */
2477 for (i = 0; suffixes[i]; i++) {
2478 slen = strlen(suffixes[i]);
2479 if (plen <= slen ||
2480 strcmp(privpath + plen - slen, suffixes[i]) != 0)
2481 continue;
2482 privpath[plen - slen] = '\0';
2483 debug("%s: %s looks like a public key, using private key "
2484 "path %s instead", __func__, keypath, privpath);
2485 }
2486 if ((privkey = load_identity(privpath, NULL)) == NULL) {
2487 error("Couldn't load identity %s", keypath);
2488 goto done;
2489 }
2490 if (!sshkey_equal_public(pubkey, privkey)) {
2491 error("Public key %s doesn't match private %s",
2492 keypath, privpath);
2493 goto done;
2494 }
2495 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) {
2496 /*
2497 * Graft the certificate onto the private key to make
2498 * it capable of signing.
2499 */
2500 if ((r = sshkey_to_certified(privkey)) != 0) {
2501 error("%s: sshkey_to_certified: %s", __func__,
2502 ssh_err(r));
2503 goto done;
2504 }
2505 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) {
2506 error("%s: sshkey_cert_copy: %s", __func__, ssh_err(r));
2507 goto done;
2508 }
2509 }
2510 /* success */
2511 ret = privkey;
2512 privkey = NULL;
2513 done:
2514 sshkey_free(privkey);
2515 free(privpath);
2516 return ret;
2517 }
2518
2519 static int
2520 sign_one(struct sshkey *signkey, const char *filename, int fd,
2521 const char *sig_namespace, sshsig_signer *signer, void *signer_ctx)
2522 {
2523 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2524 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno;
2525 char *wfile = NULL, *asig = NULL, *fp = NULL;
2526
2527 if (!quiet) {
2528 if (fd == STDIN_FILENO)
2529 fprintf(stderr, "Signing data on standard input\n");
2530 else
2531 fprintf(stderr, "Signing file %s\n", filename);
2532 }
2533 if (signer == NULL && sshkey_is_sk(signkey) &&
2534 (signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
2535 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash,
2536 SSH_FP_DEFAULT)) == NULL)
2537 fatal("%s: sshkey_fingerprint failed", __func__);
2538 fprintf(stderr, "Confirm user presence for key %s %s\n",
2539 sshkey_type(signkey), fp);
2540 free(fp);
2541 }
2542 if ((r = sshsig_sign_fd(signkey, NULL, sk_provider, fd, sig_namespace,
2543 &sigbuf, signer, signer_ctx)) != 0) {
2544 error("Signing %s failed: %s", filename, ssh_err(r));
2545 goto out;
2546 }
2547 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) {
2548 error("%s: sshsig_armor: %s", __func__, ssh_err(r));
2549 goto out;
2550 }
2551 if ((asig = sshbuf_dup_string(abuf)) == NULL) {
2552 error("%s: buffer error", __func__);
2553 r = SSH_ERR_ALLOC_FAIL;
2554 goto out;
2555 }
2556
2557 if (fd == STDIN_FILENO) {
2558 fputs(asig, stdout);
2559 fflush(stdout);
2560 } else {
2561 xasprintf(&wfile, "%s.sig", filename);
2562 if (confirm_overwrite(wfile)) {
2563 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC,
2564 0666)) == -1) {
2565 oerrno = errno;
2566 error("Cannot open %s: %s",
2567 wfile, strerror(errno));
2568 errno = oerrno;
2569 r = SSH_ERR_SYSTEM_ERROR;
2570 goto out;
2571 }
2572 if (atomicio(vwrite, wfd, asig,
2573 strlen(asig)) != strlen(asig)) {
2574 oerrno = errno;
2575 error("Cannot write to %s: %s",
2576 wfile, strerror(errno));
2577 errno = oerrno;
2578 r = SSH_ERR_SYSTEM_ERROR;
2579 goto out;
2580 }
2581 if (!quiet) {
2582 fprintf(stderr, "Write signature to %s\n",
2583 wfile);
2584 }
2585 }
2586 }
2587 /* success */
2588 r = 0;
2589 out:
2590 free(wfile);
2591 free(asig);
2592 sshbuf_free(abuf);
2593 sshbuf_free(sigbuf);
2594 if (wfd != -1)
2595 close(wfd);
2596 return r;
2597 }
2598
2599 static int
2600 sign(const char *keypath, const char *sig_namespace, int argc, char **argv)
2601 {
2602 int i, fd = -1, r, ret = -1;
2603 int agent_fd = -1;
2604 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL;
2605 sshsig_signer *signer = NULL;
2606
2607 /* Check file arguments. */
2608 for (i = 0; i < argc; i++) {
2609 if (strcmp(argv[i], "-") != 0)
2610 continue;
2611 if (i > 0 || argc > 1)
2612 fatal("Cannot sign mix of paths and standard input");
2613 }
2614
2615 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) {
2616 error("Couldn't load public key %s: %s", keypath, ssh_err(r));
2617 goto done;
2618 }
2619
2620 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
2621 debug("Couldn't get agent socket: %s", ssh_err(r));
2622 else {
2623 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0)
2624 signer = agent_signer;
2625 else
2626 debug("Couldn't find key in agent: %s", ssh_err(r));
2627 }
2628
2629 if (signer == NULL) {
2630 /* Not using agent - try to load private key */
2631 if ((privkey = load_sign_key(keypath, pubkey)) == NULL)
2632 goto done;
2633 signkey = privkey;
2634 } else {
2635 /* Will use key in agent */
2636 signkey = pubkey;
2637 }
2638
2639 if (argc == 0) {
2640 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO,
2641 sig_namespace, signer, &agent_fd)) != 0)
2642 goto done;
2643 } else {
2644 for (i = 0; i < argc; i++) {
2645 if (strcmp(argv[i], "-") == 0)
2646 fd = STDIN_FILENO;
2647 else if ((fd = open(argv[i], O_RDONLY)) == -1) {
2648 error("Cannot open %s for signing: %s",
2649 argv[i], strerror(errno));
2650 goto done;
2651 }
2652 if ((r = sign_one(signkey, argv[i], fd, sig_namespace,
2653 signer, &agent_fd)) != 0)
2654 goto done;
2655 if (fd != STDIN_FILENO)
2656 close(fd);
2657 fd = -1;
2658 }
2659 }
2660
2661 ret = 0;
2662 done:
2663 if (fd != -1 && fd != STDIN_FILENO)
2664 close(fd);
2665 sshkey_free(pubkey);
2666 sshkey_free(privkey);
2667 return ret;
2668 }
2669
2670 static int
2671 verify(const char *signature, const char *sig_namespace, const char *principal,
2672 const char *allowed_keys, const char *revoked_keys)
2673 {
2674 int r, ret = -1, sigfd = -1;
2675 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2676 struct sshkey *sign_key = NULL;
2677 char *fp = NULL;
2678 struct sshkey_sig_details *sig_details = NULL;
2679
2680 memset(&sig_details, 0, sizeof(sig_details));
2681 if ((abuf = sshbuf_new()) == NULL)
2682 fatal("%s: sshbuf_new() failed", __func__);
2683
2684 if ((sigfd = open(signature, O_RDONLY)) < 0) {
2685 error("Couldn't open signature file %s", signature);
2686 goto done;
2687 }
2688
2689 if ((r = sshkey_load_file(sigfd, abuf)) != 0) {
2690 error("Couldn't read signature file: %s", ssh_err(r));
2691 goto done;
2692 }
2693 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2694 error("%s: sshsig_armor: %s", __func__, ssh_err(r));
2695 return r;
2696 }
2697 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace,
2698 &sign_key, &sig_details)) != 0)
2699 goto done; /* sshsig_verify() prints error */
2700
2701 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2702 SSH_FP_DEFAULT)) == NULL)
2703 fatal("%s: sshkey_fingerprint failed", __func__);
2704 debug("Valid (unverified) signature from key %s", fp);
2705 if (sig_details != NULL) {
2706 debug2("%s: signature details: counter = %u, flags = 0x%02x",
2707 __func__, sig_details->sk_counter, sig_details->sk_flags);
2708 }
2709 free(fp);
2710 fp = NULL;
2711
2712 if (revoked_keys != NULL) {
2713 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
2714 debug3("sshkey_check_revoked failed: %s", ssh_err(r));
2715 goto done;
2716 }
2717 }
2718
2719 if (allowed_keys != NULL &&
2720 (r = sshsig_check_allowed_keys(allowed_keys, sign_key,
2721 principal, sig_namespace)) != 0) {
2722 debug3("sshsig_check_allowed_keys failed: %s", ssh_err(r));
2723 goto done;
2724 }
2725 /* success */
2726 ret = 0;
2727 done:
2728 if (!quiet) {
2729 if (ret == 0) {
2730 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2731 SSH_FP_DEFAULT)) == NULL) {
2732 fatal("%s: sshkey_fingerprint failed",
2733 __func__);
2734 }
2735 if (principal == NULL) {
2736 printf("Good \"%s\" signature with %s key %s\n",
2737 sig_namespace, sshkey_type(sign_key), fp);
2738
2739 } else {
2740 printf("Good \"%s\" signature for %s with %s key %s\n",
2741 sig_namespace, principal,
2742 sshkey_type(sign_key), fp);
2743 }
2744 } else {
2745 printf("Could not verify signature.\n");
2746 }
2747 }
2748 if (sigfd != -1)
2749 close(sigfd);
2750 sshbuf_free(sigbuf);
2751 sshbuf_free(abuf);
2752 sshkey_free(sign_key);
2753 sshkey_sig_details_free(sig_details);
2754 free(fp);
2755 return ret;
2756 }
2757
2758 static void
2759 do_moduli_gen(const char *out_file, char **opts, size_t nopts)
2760 {
2761 #ifdef WITH_OPENSSL
2762 /* Moduli generation/screening */
2763 u_int32_t memory = 0;
2764 BIGNUM *start = NULL;
2765 int moduli_bits = 0;
2766 FILE *out;
2767 size_t i;
2768 const char *errstr;
2769
2770 /* Parse options */
2771 for (i = 0; i < nopts; i++) {
2772 if (strncmp(opts[i], "memory=", 7) == 0) {
2773 memory = (u_int32_t)strtonum(opts[i]+7, 1,
2774 UINT_MAX, &errstr);
2775 if (errstr) {
2776 fatal("Memory limit is %s: %s",
2777 errstr, opts[i]+7);
2778 }
2779 } else if (strncmp(opts[i], "start=", 6) == 0) {
2780 /* XXX - also compare length against bits */
2781 if (BN_hex2bn(&start, opts[i]+6) == 0)
2782 fatal("Invalid start point.");
2783 } else if (strncmp(opts[i], "bits=", 5) == 0) {
2784 moduli_bits = (int)strtonum(opts[i]+5, 1,
2785 INT_MAX, &errstr);
2786 if (errstr) {
2787 fatal("Invalid number: %s (%s)",
2788 opts[i]+12, errstr);
2789 }
2790 } else {
2791 fatal("Option \"%s\" is unsupported for moduli "
2792 "generation", opts[i]);
2793 }
2794 }
2795
2796 if ((out = fopen(out_file, "w")) == NULL) {
2797 fatal("Couldn't open modulus candidate file \"%s\": %s",
2798 out_file, strerror(errno));
2799 }
2800 setvbuf(out, NULL, _IOLBF, 0);
2801
2802 if (moduli_bits == 0)
2803 moduli_bits = DEFAULT_BITS;
2804 if (gen_candidates(out, memory, moduli_bits, start) != 0)
2805 fatal("modulus candidate generation failed");
2806 #else /* WITH_OPENSSL */
2807 fatal("Moduli generation is not supported");
2808 #endif /* WITH_OPENSSL */
2809 }
2810
2811 static void
2812 do_moduli_screen(const char *out_file, char **opts, size_t nopts)
2813 {
2814 #ifdef WITH_OPENSSL
2815 /* Moduli generation/screening */
2816 char *checkpoint = NULL;
2817 u_int32_t generator_wanted = 0;
2818 unsigned long start_lineno = 0, lines_to_process = 0;
2819 int prime_tests = 0;
2820 FILE *out, *in = stdin;
2821 size_t i;
2822 const char *errstr;
2823
2824 /* Parse options */
2825 for (i = 0; i < nopts; i++) {
2826 if (strncmp(opts[i], "lines=", 6) == 0) {
2827 lines_to_process = strtoul(opts[i]+6, NULL, 10);
2828 } else if (strncmp(opts[i], "start-line=", 11) == 0) {
2829 start_lineno = strtoul(opts[i]+11, NULL, 10);
2830 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) {
2831 checkpoint = xstrdup(opts[i]+11);
2832 } else if (strncmp(opts[i], "generator=", 10) == 0) {
2833 generator_wanted = (u_int32_t)strtonum(
2834 opts[i]+10, 1, UINT_MAX, &errstr);
2835 if (errstr != NULL) {
2836 fatal("Generator invalid: %s (%s)",
2837 opts[i]+10, errstr);
2838 }
2839 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) {
2840 prime_tests = (int)strtonum(opts[i]+12, 1,
2841 INT_MAX, &errstr);
2842 if (errstr) {
2843 fatal("Invalid number: %s (%s)",
2844 opts[i]+12, errstr);
2845 }
2846 } else {
2847 fatal("Option \"%s\" is unsupported for moduli "
2848 "screening", opts[i]);
2849 }
2850 }
2851
2852 if (have_identity && strcmp(identity_file, "-") != 0) {
2853 if ((in = fopen(identity_file, "r")) == NULL) {
2854 fatal("Couldn't open modulus candidate "
2855 "file \"%s\": %s", identity_file,
2856 strerror(errno));
2857 }
2858 }
2859
2860 if ((out = fopen(out_file, "a")) == NULL) {
2861 fatal("Couldn't open moduli file \"%s\": %s",
2862 out_file, strerror(errno));
2863 }
2864 setvbuf(out, NULL, _IOLBF, 0);
2865 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests,
2866 generator_wanted, checkpoint,
2867 start_lineno, lines_to_process) != 0)
2868 fatal("modulus screening failed");
2869 #else /* WITH_OPENSSL */
2870 fatal("Moduli screening is not supported");
2871 #endif /* WITH_OPENSSL */
2872 }
2873
2874 static char *
2875 private_key_passphrase(void)
2876 {
2877 char *passphrase1, *passphrase2;
2878
2879 /* Ask for a passphrase (twice). */
2880 if (identity_passphrase)
2881 passphrase1 = xstrdup(identity_passphrase);
2882 else if (identity_new_passphrase)
2883 passphrase1 = xstrdup(identity_new_passphrase);
2884 else {
2885 passphrase_again:
2886 passphrase1 =
2887 read_passphrase("Enter passphrase (empty for no "
2888 "passphrase): ", RP_ALLOW_STDIN);
2889 passphrase2 = read_passphrase("Enter same passphrase again: ",
2890 RP_ALLOW_STDIN);
2891 if (strcmp(passphrase1, passphrase2) != 0) {
2892 /*
2893 * The passphrases do not match. Clear them and
2894 * retry.
2895 */
2896 freezero(passphrase1, strlen(passphrase1));
2897 freezero(passphrase2, strlen(passphrase2));
2898 printf("Passphrases do not match. Try again.\n");
2899 goto passphrase_again;
2900 }
2901 /* Clear the other copy of the passphrase. */
2902 freezero(passphrase2, strlen(passphrase2));
2903 }
2904 return passphrase1;
2905 }
2906
2907 static const char *
2908 skip_ssh_url_preamble(const char *s)
2909 {
2910 if (strncmp(s, "ssh://", 6) == 0)
2911 return s + 6;
2912 else if (strncmp(s, "ssh:", 4) == 0)
2913 return s + 4;
2914 return s;
2915 }
2916
2917 static int
2918 do_download_sk(const char *skprovider)
2919 {
2920 struct sshkey **keys;
2921 size_t nkeys, i;
2922 int r, ok = -1;
2923 char *fp, *pin, *pass = NULL, *path, *pubpath;
2924 const char *ext;
2925
2926 if (skprovider == NULL)
2927 fatal("Cannot download keys without provider");
2928
2929 pin = read_passphrase("Enter PIN for security key: ", RP_ALLOW_STDIN);
2930 if ((r = sshsk_load_resident(skprovider, pin, &keys, &nkeys)) != 0) {
2931 freezero(pin, strlen(pin));
2932 error("Unable to load resident keys: %s", ssh_err(r));
2933 return -1;
2934 }
2935 if (nkeys == 0)
2936 logit("No keys to download");
2937 freezero(pin, strlen(pin));
2938
2939 for (i = 0; i < nkeys; i++) {
2940 if (keys[i]->type != KEY_ECDSA_SK &&
2941 keys[i]->type != KEY_ED25519_SK) {
2942 error("Unsupported key type %s (%d)",
2943 sshkey_type(keys[i]), keys[i]->type);
2944 continue;
2945 }
2946 if ((fp = sshkey_fingerprint(keys[i],
2947 fingerprint_hash, SSH_FP_DEFAULT)) == NULL)
2948 fatal("%s: sshkey_fingerprint failed", __func__);
2949 debug("%s: key %zu: %s %s %s (flags 0x%02x)", __func__, i,
2950 sshkey_type(keys[i]), fp, keys[i]->sk_application,
2951 keys[i]->sk_flags);
2952 ext = skip_ssh_url_preamble(keys[i]->sk_application);
2953 xasprintf(&path, "id_%s_rk%s%s",
2954 keys[i]->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk",
2955 *ext == '\0' ? "" : "_", ext);
2956
2957 /* If the file already exists, ask the user to confirm. */
2958 if (!confirm_overwrite(path)) {
2959 free(path);
2960 break;
2961 }
2962
2963 /* Save the key with the application string as the comment */
2964 if (pass == NULL)
2965 pass = private_key_passphrase();
2966 if ((r = sshkey_save_private(keys[i], path, pass,
2967 keys[i]->sk_application, private_key_format,
2968 openssh_format_cipher, rounds)) != 0) {
2969 error("Saving key \"%s\" failed: %s",
2970 path, ssh_err(r));
2971 free(path);
2972 break;
2973 }
2974 if (!quiet) {
2975 printf("Saved %s key%s%s to %s\n",
2976 sshkey_type(keys[i]),
2977 *ext != '\0' ? " " : "",
2978 *ext != '\0' ? keys[i]->sk_application : "",
2979 path);
2980 }
2981
2982 /* Save public key too */
2983 xasprintf(&pubpath, "%s.pub", path);
2984 free(path);
2985 if ((r = sshkey_save_public(keys[i], pubpath,
2986 keys[i]->sk_application)) != 0) {
2987 free(pubpath);
2988 error("Saving public key \"%s\" failed: %s",
2989 pubpath, ssh_err(r));
2990 break;
2991 }
2992 free(pubpath);
2993 }
2994
2995 if (i >= nkeys)
2996 ok = 0; /* success */
2997 if (pass != NULL)
2998 freezero(pass, strlen(pass));
2999 for (i = 0; i < nkeys; i++)
3000 sshkey_free(keys[i]);
3001 free(keys);
3002 return ok ? 0 : -1;
3003 }
3004
3005 static void
3006 usage(void)
3007 {
3008 fprintf(stderr,
3009 "usage: ssh-keygen [-q] [-b bits] [-C comment] [-f output_keyfile] [-m format]\n"
3010 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n"
3011 " [-N new_passphrase] [-w provider] [-x flags]\n"
3012 " ssh-keygen -p [-f keyfile] [-m format] [-N new_passphrase]\n"
3013 " [-P old_passphrase]\n"
3014 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n"
3015 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n"
3016 " ssh-keygen -y [-f input_keyfile]\n"
3017 " ssh-keygen -c [-C comment] [-f keyfile] [-P passphrase]\n"
3018 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
3019 " ssh-keygen -B [-f input_keyfile]\n");
3020 #ifdef ENABLE_PKCS11
3021 fprintf(stderr,
3022 " ssh-keygen -D pkcs11\n");
3023 #endif
3024 fprintf(stderr,
3025 " ssh-keygen -K path [-w sk_provider]\n");
3026 fprintf(stderr,
3027 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n"
3028 " ssh-keygen -H [-f known_hosts_file]\n"
3029 " ssh-keygen -R hostname [-f known_hosts_file]\n"
3030 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n"
3031 #ifdef WITH_OPENSSL
3032 " ssh-keygen -M generate [-O option] output\n"
3033 " ssh-keygen -M screen [-f input_file] [-O option] [-a rounds] output_file\n"
3034 #endif
3035 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n"
3036 " [-n principals] [-O option] [-V validity_interval]\n"
3037 " [-z serial_number] file ...\n"
3038 " ssh-keygen -L [-f input_keyfile]\n"
3039 " ssh-keygen -A [-f prefix_path]\n"
3040 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
3041 " file ...\n"
3042 " ssh-keygen -Q -f krl_file file ...\n"
3043 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n"
3044 " ssh-keygen -Y sign -f key_file -n namespace file ...\n"
3045 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n"
3046 " -n namespace -s signature_file [-r revocation_file]\n");
3047 exit(1);
3048 }
3049
3050 /*
3051 * Main program for key management.
3052 */
3053 int
3054 main(int argc, char **argv)
3055 {
3056 char dotsshdir[PATH_MAX], comment[1024], *passphrase;
3057 char *rr_hostname = NULL, *ep, *fp, *ra;
3058 struct sshkey *private, *public;
3059 struct passwd *pw;
3060 struct stat st;
3061 int r, opt, type;
3062 int change_passphrase = 0, change_comment = 0, show_cert = 0;
3063 int find_host = 0, delete_host = 0, hash_hosts = 0;
3064 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
3065 int prefer_agent = 0, convert_to = 0, convert_from = 0;
3066 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0;
3067 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0;
3068 unsigned long long cert_serial = 0;
3069 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL;
3070 size_t i, nopts = 0;
3071 u_int32_t bits = 0;
3072 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD;
3073 const char *errstr;
3074 int log_level = SYSLOG_LEVEL_INFO;
3075 char *sign_op = NULL;
3076
3077 extern int optind;
3078 extern char *optarg;
3079
3080 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
3081 sanitise_stdfd();
3082
3083 __progname = ssh_get_progname(argv[0]);
3084
3085 seed_rng();
3086
3087 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
3088
3089 msetlocale();
3090
3091 /* we need this for the home * directory. */
3092 pw = getpwuid(getuid());
3093 if (!pw)
3094 fatal("No user exists for uid %lu", (u_long)getuid());
3095 if (gethostname(hostname, sizeof(hostname)) == -1)
3096 fatal("gethostname: %s", strerror(errno));
3097
3098 sk_provider = getenv("SSH_SK_PROVIDER");
3099
3100 /* Remaining characters: dGjJSTWx */
3101 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy"
3102 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:"
3103 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) {
3104 switch (opt) {
3105 case 'A':
3106 gen_all_hostkeys = 1;
3107 break;
3108 case 'b':
3109 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX,
3110 &errstr);
3111 if (errstr)
3112 fatal("Bits has bad value %s (%s)",
3113 optarg, errstr);
3114 break;
3115 case 'E':
3116 fingerprint_hash = ssh_digest_alg_by_name(optarg);
3117 if (fingerprint_hash == -1)
3118 fatal("Invalid hash algorithm \"%s\"", optarg);
3119 break;
3120 case 'F':
3121 find_host = 1;
3122 rr_hostname = optarg;
3123 break;
3124 case 'H':
3125 hash_hosts = 1;
3126 break;
3127 case 'I':
3128 cert_key_id = optarg;
3129 break;
3130 case 'R':
3131 delete_host = 1;
3132 rr_hostname = optarg;
3133 break;
3134 case 'L':
3135 show_cert = 1;
3136 break;
3137 case 'l':
3138 print_fingerprint = 1;
3139 break;
3140 case 'B':
3141 print_bubblebabble = 1;
3142 break;
3143 case 'm':
3144 if (strcasecmp(optarg, "RFC4716") == 0 ||
3145 strcasecmp(optarg, "ssh2") == 0) {
3146 convert_format = FMT_RFC4716;
3147 break;
3148 }
3149 if (strcasecmp(optarg, "PKCS8") == 0) {
3150 convert_format = FMT_PKCS8;
3151 private_key_format = SSHKEY_PRIVATE_PKCS8;
3152 break;
3153 }
3154 if (strcasecmp(optarg, "PEM") == 0) {
3155 convert_format = FMT_PEM;
3156 private_key_format = SSHKEY_PRIVATE_PEM;
3157 break;
3158 }
3159 fatal("Unsupported conversion format \"%s\"", optarg);
3160 case 'n':
3161 cert_principals = optarg;
3162 break;
3163 case 'o':
3164 /* no-op; new format is already the default */
3165 break;
3166 case 'p':
3167 change_passphrase = 1;
3168 break;
3169 case 'c':
3170 change_comment = 1;
3171 break;
3172 case 'f':
3173 if (strlcpy(identity_file, optarg,
3174 sizeof(identity_file)) >= sizeof(identity_file))
3175 fatal("Identity filename too long");
3176 have_identity = 1;
3177 break;
3178 case 'g':
3179 print_generic = 1;
3180 break;
3181 case 'K':
3182 download_sk = 1;
3183 break;
3184 case 'P':
3185 identity_passphrase = optarg;
3186 break;
3187 case 'N':
3188 identity_new_passphrase = optarg;
3189 break;
3190 case 'Q':
3191 check_krl = 1;
3192 break;
3193 case 'O':
3194 opts = xrecallocarray(opts, nopts, nopts + 1,
3195 sizeof(*opts));
3196 opts[nopts++] = xstrdup(optarg);
3197 break;
3198 case 'Z':
3199 openssh_format_cipher = optarg;
3200 break;
3201 case 'C':
3202 identity_comment = optarg;
3203 break;
3204 case 'q':
3205 quiet = 1;
3206 break;
3207 case 'e':
3208 /* export key */
3209 convert_to = 1;
3210 break;
3211 case 'h':
3212 cert_key_type = SSH2_CERT_TYPE_HOST;
3213 certflags_flags = 0;
3214 break;
3215 case 'k':
3216 gen_krl = 1;
3217 break;
3218 case 'i':
3219 case 'X':
3220 /* import key */
3221 convert_from = 1;
3222 break;
3223 case 'y':
3224 print_public = 1;
3225 break;
3226 case 's':
3227 ca_key_path = optarg;
3228 break;
3229 case 't':
3230 key_type_name = optarg;
3231 break;
3232 case 'D':
3233 pkcs11provider = optarg;
3234 break;
3235 case 'U':
3236 prefer_agent = 1;
3237 break;
3238 case 'u':
3239 update_krl = 1;
3240 break;
3241 case 'v':
3242 if (log_level == SYSLOG_LEVEL_INFO)
3243 log_level = SYSLOG_LEVEL_DEBUG1;
3244 else {
3245 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
3246 log_level < SYSLOG_LEVEL_DEBUG3)
3247 log_level++;
3248 }
3249 break;
3250 case 'r':
3251 rr_hostname = optarg;
3252 break;
3253 case 'a':
3254 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
3255 if (errstr)
3256 fatal("Invalid number: %s (%s)",
3257 optarg, errstr);
3258 break;
3259 case 'V':
3260 parse_cert_times(optarg);
3261 break;
3262 case 'Y':
3263 sign_op = optarg;
3264 break;
3265 case 'w':
3266 sk_provider = optarg;
3267 break;
3268 case 'z':
3269 errno = 0;
3270 if (*optarg == '+') {
3271 cert_serial_autoinc = 1;
3272 optarg++;
3273 }
3274 cert_serial = strtoull(optarg, &ep, 10);
3275 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
3276 (errno == ERANGE && cert_serial == ULLONG_MAX))
3277 fatal("Invalid serial number \"%s\"", optarg);
3278 break;
3279 case 'M':
3280 if (strcmp(optarg, "generate") == 0)
3281 do_gen_candidates = 1;
3282 else if (strcmp(optarg, "screen") == 0)
3283 do_screen_candidates = 1;
3284 else
3285 fatal("Unsupported moduli option %s", optarg);
3286 break;
3287 case '?':
3288 default:
3289 usage();
3290 }
3291 }
3292
3293 #ifdef ENABLE_SK_INTERNAL
3294 if (sk_provider == NULL)
3295 sk_provider = "internal";
3296 #endif
3297
3298 /* reinit */
3299 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
3300
3301 argv += optind;
3302 argc -= optind;
3303
3304 if (sign_op != NULL) {
3305 if (cert_principals == NULL || *cert_principals == '\0') {
3306 error("Too few arguments for sign/verify: "
3307 "missing namespace");
3308 exit(1);
3309 }
3310 if (strncmp(sign_op, "sign", 4) == 0) {
3311 if (!have_identity) {
3312 error("Too few arguments for sign: "
3313 "missing key");
3314 exit(1);
3315 }
3316 return sign(identity_file, cert_principals, argc, argv);
3317 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) {
3318 if (ca_key_path == NULL) {
3319 error("Too few arguments for check-novalidate: "
3320 "missing signature file");
3321 exit(1);
3322 }
3323 return verify(ca_key_path, cert_principals,
3324 NULL, NULL, NULL);
3325 } else if (strncmp(sign_op, "verify", 6) == 0) {
3326 if (ca_key_path == NULL) {
3327 error("Too few arguments for verify: "
3328 "missing signature file");
3329 exit(1);
3330 }
3331 if (!have_identity) {
3332 error("Too few arguments for sign: "
3333 "missing allowed keys file");
3334 exit(1);
3335 }
3336 if (cert_key_id == NULL) {
3337 error("Too few arguments for verify: "
3338 "missing principal ID");
3339 exit(1);
3340 }
3341 return verify(ca_key_path, cert_principals,
3342 cert_key_id, identity_file, rr_hostname);
3343 }
3344 usage();
3345 /* NOTREACHED */
3346 }
3347
3348 if (ca_key_path != NULL) {
3349 if (argc < 1 && !gen_krl) {
3350 error("Too few arguments.");
3351 usage();
3352 }
3353 } else if (argc > 0 && !gen_krl && !check_krl &&
3354 !do_gen_candidates && !do_screen_candidates) {
3355 error("Too many arguments.");
3356 usage();
3357 }
3358 if (change_passphrase && change_comment) {
3359 error("Can only have one of -p and -c.");
3360 usage();
3361 }
3362 if (print_fingerprint && (delete_host || hash_hosts)) {
3363 error("Cannot use -l with -H or -R.");
3364 usage();
3365 }
3366 if (gen_krl) {
3367 #ifdef WITH_OPENSSL
3368 do_gen_krl(pw, update_krl, ca_key_path,
3369 cert_serial, identity_comment, argc, argv);
3370 return (0);
3371 #else
3372 fatal("KRL generation not supported");
3373 #endif
3374 }
3375 if (check_krl) {
3376 #ifdef WITH_OPENSSL
3377 do_check_krl(pw, argc, argv);
3378 return (0);
3379 #else
3380 fatal("KRL checking not supported");
3381 #endif
3382 }
3383 if (ca_key_path != NULL) {
3384 if (cert_key_id == NULL)
3385 fatal("Must specify key id (-I) when certifying");
3386 for (i = 0; i < nopts; i++)
3387 add_cert_option(opts[i]);
3388 do_ca_sign(pw, ca_key_path, prefer_agent,
3389 cert_serial, cert_serial_autoinc, argc, argv);
3390 }
3391 if (show_cert)
3392 do_show_cert(pw);
3393 if (delete_host || hash_hosts || find_host) {
3394 do_known_hosts(pw, rr_hostname, find_host,
3395 delete_host, hash_hosts);
3396 }
3397 if (pkcs11provider != NULL)
3398 do_download(pw);
3399 if (download_sk)
3400 return do_download_sk(sk_provider);
3401 if (print_fingerprint || print_bubblebabble)
3402 do_fingerprint(pw);
3403 if (change_passphrase)
3404 do_change_passphrase(pw);
3405 if (change_comment)
3406 do_change_comment(pw, identity_comment);
3407 #ifdef WITH_OPENSSL
3408 if (convert_to)
3409 do_convert_to(pw);
3410 if (convert_from)
3411 do_convert_from(pw);
3412 #else /* WITH_OPENSSL */
3413 if (convert_to || convert_from)
3414 fatal("key conversion disabled at compile time");
3415 #endif /* WITH_OPENSSL */
3416 if (print_public)
3417 do_print_public(pw);
3418 if (rr_hostname != NULL) {
3419 unsigned int n = 0;
3420
3421 if (have_identity) {
3422 n = do_print_resource_record(pw, identity_file,
3423 rr_hostname, print_generic);
3424 if (n == 0)
3425 fatal("%s: %s", identity_file, strerror(errno));
3426 exit(0);
3427 } else {
3428
3429 n += do_print_resource_record(pw,
3430 _PATH_HOST_RSA_KEY_FILE, rr_hostname,
3431 print_generic);
3432 n += do_print_resource_record(pw,
3433 _PATH_HOST_DSA_KEY_FILE, rr_hostname,
3434 print_generic);
3435 n += do_print_resource_record(pw,
3436 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname,
3437 print_generic);
3438 n += do_print_resource_record(pw,
3439 _PATH_HOST_ED25519_KEY_FILE, rr_hostname,
3440 print_generic);
3441 n += do_print_resource_record(pw,
3442 _PATH_HOST_XMSS_KEY_FILE, rr_hostname,
3443 print_generic);
3444 if (n == 0)
3445 fatal("no keys found.");
3446 exit(0);
3447 }
3448 }
3449
3450 if (do_gen_candidates || do_screen_candidates) {
3451 if (argc <= 0)
3452 fatal("No output file specified");
3453 else if (argc > 1)
3454 fatal("Too many output files specified");
3455 }
3456 if (do_gen_candidates) {
3457 do_moduli_gen(argv[0], opts, nopts);
3458 return 0;
3459 }
3460 if (do_screen_candidates) {
3461 do_moduli_screen(argv[0], opts, nopts);
3462 return 0;
3463 }
3464
3465 if (gen_all_hostkeys) {
3466 do_gen_all_hostkeys(pw);
3467 return (0);
3468 }
3469
3470 if (key_type_name == NULL)
3471 key_type_name = DEFAULT_KEY_TYPE_NAME;
3472
3473 type = sshkey_type_from_name(key_type_name);
3474 type_bits_valid(type, key_type_name, &bits);
3475
3476 if (!quiet)
3477 printf("Generating public/private %s key pair.\n",
3478 key_type_name);
3479 switch (type) {
3480 case KEY_ECDSA_SK:
3481 case KEY_ED25519_SK:
3482 for (i = 0; i < nopts; i++) {
3483 if (strcasecmp(opts[i], "no-touch-required") == 0) {
3484 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
3485 } else if (strcasecmp(opts[i], "resident") == 0) {
3486 sk_flags |= SSH_SK_RESIDENT_KEY;
3487 } else {
3488 fatal("Option \"%s\" is unsupported for "
3489 "FIDO authenticator enrollment", opts[i]);
3490 }
3491 }
3492 if (!quiet) {
3493 printf("You may need to touch your security key "
3494 "to authorize key generation.\n");
3495 }
3496 passphrase = NULL;
3497 for (i = 0 ; i < 3; i++) {
3498 if (!quiet) {
3499 printf("You may need to touch your security "
3500 "key to authorize key generation.\n");
3501 }
3502 fflush(stdout);
3503 r = sshsk_enroll(type, sk_provider,
3504 cert_key_id == NULL ? "ssh:" : cert_key_id,
3505 sk_flags, passphrase, NULL, &private, NULL);
3506 if (r == 0)
3507 break;
3508 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
3509 exit(1); /* error message already printed */
3510 if (passphrase != NULL)
3511 freezero(passphrase, strlen(passphrase));
3512 passphrase = read_passphrase("Enter PIN for security "
3513 "key: ", RP_ALLOW_STDIN);
3514 }
3515 if (passphrase != NULL)
3516 freezero(passphrase, strlen(passphrase));
3517 if (i > 3)
3518 fatal("Too many incorrect PINs");
3519 break;
3520 default:
3521 if ((r = sshkey_generate(type, bits, &private)) != 0)
3522 fatal("sshkey_generate failed");
3523 break;
3524 }
3525 if ((r = sshkey_from_private(private, &public)) != 0)
3526 fatal("sshkey_from_private failed: %s\n", ssh_err(r));
3527
3528 if (!have_identity)
3529 ask_filename(pw, "Enter file in which to save the key");
3530
3531 /* Create ~/.ssh directory if it doesn't already exist. */
3532 snprintf(dotsshdir, sizeof dotsshdir, "%s/%s",
3533 pw->pw_dir, _PATH_SSH_USER_DIR);
3534 if (strstr(identity_file, dotsshdir) != NULL) {
3535 if (stat(dotsshdir, &st) == -1) {
3536 if (errno != ENOENT) {
3537 error("Could not stat %s: %s", dotsshdir,
3538 strerror(errno));
3539 } else if (mkdir(dotsshdir, 0700) == -1) {
3540 error("Could not create directory '%s': %s",
3541 dotsshdir, strerror(errno));
3542 } else if (!quiet)
3543 printf("Created directory '%s'.\n", dotsshdir);
3544 }
3545 }
3546 /* If the file already exists, ask the user to confirm. */
3547 if (!confirm_overwrite(identity_file))
3548 exit(1);
3549
3550 /* Determine the passphrase for the private key */
3551 passphrase = private_key_passphrase();
3552 if (identity_comment) {
3553 strlcpy(comment, identity_comment, sizeof(comment));
3554 } else {
3555 /* Create default comment field for the passphrase. */
3556 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
3557 }
3558
3559 /* Save the key with the given passphrase and comment. */
3560 if ((r = sshkey_save_private(private, identity_file, passphrase,
3561 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
3562 error("Saving key \"%s\" failed: %s",
3563 identity_file, ssh_err(r));
3564 freezero(passphrase, strlen(passphrase));
3565 exit(1);
3566 }
3567 freezero(passphrase, strlen(passphrase));
3568 sshkey_free(private);
3569
3570 if (!quiet) {
3571 printf("Your identification has been saved in %s.\n",
3572 identity_file);
3573 }
3574
3575 strlcat(identity_file, ".pub", sizeof(identity_file));
3576 if ((r = sshkey_save_public(public, identity_file, comment)) != 0) {
3577 fatal("Unable to save public key to %s: %s",
3578 identity_file, strerror(errno));
3579 }
3580
3581 if (!quiet) {
3582 fp = sshkey_fingerprint(public, fingerprint_hash,
3583 SSH_FP_DEFAULT);
3584 ra = sshkey_fingerprint(public, fingerprint_hash,
3585 SSH_FP_RANDOMART);
3586 if (fp == NULL || ra == NULL)
3587 fatal("sshkey_fingerprint failed");
3588 printf("Your public key has been saved in %s.\n",
3589 identity_file);
3590 printf("The key fingerprint is:\n");
3591 printf("%s %s\n", fp, comment);
3592 printf("The key's randomart image is:\n");
3593 printf("%s\n", ra);
3594 free(ra);
3595 free(fp);
3596 }
3597
3598 sshkey_free(public);
3599 exit(0);
3600 }
Mirror of https://github.com/openssh/openssh-portable.git