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fix old typo (s/SYSVINITSTOPT/SYSVINITSTOP/)
[openssh.git] / ssh-keygen.c
blob89c3ed28762826f954334706b1b99aa5f7a9c4f2
1 /* $OpenBSD: ssh-keygen.c,v 1.477 2024/12/04 14:24:20 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * Identity and host key generation and maintenance.
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15 #include "includes.h"
16
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/stat.h>
20
21 #ifdef WITH_OPENSSL
22 #include <openssl/evp.h>
23 #include <openssl/pem.h>
24 #include "openbsd-compat/openssl-compat.h"
25 #endif
26
27 #ifdef HAVE_STDINT_H
28 # include <stdint.h>
29 #endif
30 #include <errno.h>
31 #include <fcntl.h>
32 #include <netdb.h>
33 #ifdef HAVE_PATHS_H
34 # include <paths.h>
35 #endif
36 #include <pwd.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <limits.h>
43 #include <locale.h>
44 #include <time.h>
45
46 #include "xmalloc.h"
47 #include "sshkey.h"
48 #include "authfile.h"
49 #include "sshbuf.h"
50 #include "pathnames.h"
51 #include "log.h"
52 #include "misc.h"
53 #include "match.h"
54 #include "hostfile.h"
55 #include "dns.h"
56 #include "ssh.h"
57 #include "ssh2.h"
58 #include "ssherr.h"
59 #include "ssh-pkcs11.h"
60 #include "atomicio.h"
61 #include "krl.h"
62 #include "digest.h"
63 #include "utf8.h"
64 #include "authfd.h"
65 #include "sshsig.h"
66 #include "ssh-sk.h"
67 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */
68 #include "cipher.h"
69
70 #define DEFAULT_KEY_TYPE_NAME "ed25519"
71
72 /*
73 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be
74 * overridden on the command line.
75 *
76 * These values, with the exception of DSA, provide security equivalent to at
77 * least 128 bits of security according to NIST Special Publication 800-57:
78 * Recommendation for Key Management Part 1 rev 4 section 5.6.1.
79 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
80 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
81 * SHA1 we limit the DSA key size 1k bits.
82 */
83 #define DEFAULT_BITS 3072
84 #define DEFAULT_BITS_DSA 1024
85 #define DEFAULT_BITS_ECDSA 256
86
87 static int quiet = 0;
88
89 /* Flag indicating that we just want to see the key fingerprint */
90 static int print_fingerprint = 0;
91 static int print_bubblebabble = 0;
92
93 /* Hash algorithm to use for fingerprints. */
94 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
95
96 /* The identity file name, given on the command line or entered by the user. */
97 static char identity_file[PATH_MAX];
98 static int have_identity = 0;
99
100 /* This is set to the passphrase if given on the command line. */
101 static char *identity_passphrase = NULL;
102
103 /* This is set to the new passphrase if given on the command line. */
104 static char *identity_new_passphrase = NULL;
105
106 /* Key type when certifying */
107 static u_int cert_key_type = SSH2_CERT_TYPE_USER;
108
109 /* "key ID" of signed key */
110 static char *cert_key_id = NULL;
111
112 /* Comma-separated list of principal names for certifying keys */
113 static char *cert_principals = NULL;
114
115 /* Validity period for certificates */
116 static u_int64_t cert_valid_from = 0;
117 static u_int64_t cert_valid_to = ~0ULL;
118
119 /* Certificate options */
120 #define CERTOPT_X_FWD (1)
121 #define CERTOPT_AGENT_FWD (1<<1)
122 #define CERTOPT_PORT_FWD (1<<2)
123 #define CERTOPT_PTY (1<<3)
124 #define CERTOPT_USER_RC (1<<4)
125 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5)
126 #define CERTOPT_REQUIRE_VERIFY (1<<6)
127 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
128 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
129 static u_int32_t certflags_flags = CERTOPT_DEFAULT;
130 static char *certflags_command = NULL;
131 static char *certflags_src_addr = NULL;
132
133 /* Arbitrary extensions specified by user */
134 struct cert_ext {
135 char *key;
136 char *val;
137 int crit;
138 };
139 static struct cert_ext *cert_ext;
140 static size_t ncert_ext;
141
142 /* Conversion to/from various formats */
143 enum {
144 FMT_RFC4716,
145 FMT_PKCS8,
146 FMT_PEM
147 } convert_format = FMT_RFC4716;
148
149 static char *key_type_name = NULL;
150
151 /* Load key from this PKCS#11 provider */
152 static char *pkcs11provider = NULL;
153
154 /* FIDO/U2F provider to use */
155 static char *sk_provider = NULL;
156
157 /* Format for writing private keys */
158 static int private_key_format = SSHKEY_PRIVATE_OPENSSH;
159
160 /* Cipher for new-format private keys */
161 static char *openssh_format_cipher = NULL;
162
163 /* Number of KDF rounds to derive new format keys. */
164 static int rounds = 0;
165
166 /* argv0 */
167 extern char *__progname;
168
169 static char hostname[NI_MAXHOST];
170
171 #ifdef WITH_OPENSSL
172 /* moduli.c */
173 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
174 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
175 unsigned long);
176 #endif
177
178 static void
179 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
180 {
181 if (type == KEY_UNSPEC)
182 fatal("unknown key type %s", key_type_name);
183 if (*bitsp == 0) {
184 #ifdef WITH_OPENSSL
185 int nid;
186
187 switch(type) {
188 case KEY_DSA:
189 *bitsp = DEFAULT_BITS_DSA;
190 break;
191 case KEY_ECDSA:
192 if (name != NULL &&
193 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
194 *bitsp = sshkey_curve_nid_to_bits(nid);
195 if (*bitsp == 0)
196 *bitsp = DEFAULT_BITS_ECDSA;
197 break;
198 case KEY_RSA:
199 *bitsp = DEFAULT_BITS;
200 break;
201 }
202 #endif
203 }
204 #ifdef WITH_OPENSSL
205 switch (type) {
206 case KEY_DSA:
207 if (*bitsp != 1024)
208 fatal("Invalid DSA key length: must be 1024 bits");
209 break;
210 case KEY_RSA:
211 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
212 fatal("Invalid RSA key length: minimum is %d bits",
213 SSH_RSA_MINIMUM_MODULUS_SIZE);
214 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS)
215 fatal("Invalid RSA key length: maximum is %d bits",
216 OPENSSL_RSA_MAX_MODULUS_BITS);
217 break;
218 case KEY_ECDSA:
219 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
220 #ifdef OPENSSL_HAS_NISTP521
221 fatal("Invalid ECDSA key length: valid lengths are "
222 "256, 384 or 521 bits");
223 #else
224 fatal("Invalid ECDSA key length: valid lengths are "
225 "256 or 384 bits");
226 #endif
227 }
228 #endif
229 }
230
231 /*
232 * Checks whether a file exists and, if so, asks the user whether they wish
233 * to overwrite it.
234 * Returns nonzero if the file does not already exist or if the user agrees to
235 * overwrite, or zero otherwise.
236 */
237 static int
238 confirm_overwrite(const char *filename)
239 {
240 char yesno[3];
241 struct stat st;
242
243 if (stat(filename, &st) != 0)
244 return 1;
245 printf("%s already exists.\n", filename);
246 printf("Overwrite (y/n)? ");
247 fflush(stdout);
248 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
249 return 0;
250 if (yesno[0] != 'y' && yesno[0] != 'Y')
251 return 0;
252 return 1;
253 }
254
255 static void
256 ask_filename(struct passwd *pw, const char *prompt)
257 {
258 char buf[1024];
259 char *name = NULL;
260
261 if (key_type_name == NULL)
262 name = _PATH_SSH_CLIENT_ID_ED25519;
263 else {
264 switch (sshkey_type_from_shortname(key_type_name)) {
265 #ifdef WITH_DSA
266 case KEY_DSA_CERT:
267 case KEY_DSA:
268 name = _PATH_SSH_CLIENT_ID_DSA;
269 break;
270 #endif
271 #ifdef OPENSSL_HAS_ECC
272 case KEY_ECDSA_CERT:
273 case KEY_ECDSA:
274 name = _PATH_SSH_CLIENT_ID_ECDSA;
275 break;
276 case KEY_ECDSA_SK_CERT:
277 case KEY_ECDSA_SK:
278 name = _PATH_SSH_CLIENT_ID_ECDSA_SK;
279 break;
280 #endif
281 case KEY_RSA_CERT:
282 case KEY_RSA:
283 name = _PATH_SSH_CLIENT_ID_RSA;
284 break;
285 case KEY_ED25519:
286 case KEY_ED25519_CERT:
287 name = _PATH_SSH_CLIENT_ID_ED25519;
288 break;
289 case KEY_ED25519_SK:
290 case KEY_ED25519_SK_CERT:
291 name = _PATH_SSH_CLIENT_ID_ED25519_SK;
292 break;
293 case KEY_XMSS:
294 case KEY_XMSS_CERT:
295 name = _PATH_SSH_CLIENT_ID_XMSS;
296 break;
297 default:
298 fatal("bad key type");
299 }
300 }
301 snprintf(identity_file, sizeof(identity_file),
302 "%s/%s", pw->pw_dir, name);
303 printf("%s (%s): ", prompt, identity_file);
304 fflush(stdout);
305 if (fgets(buf, sizeof(buf), stdin) == NULL)
306 exit(1);
307 buf[strcspn(buf, "\n")] = '\0';
308 if (strcmp(buf, "") != 0)
309 strlcpy(identity_file, buf, sizeof(identity_file));
310 have_identity = 1;
311 }
312
313 static struct sshkey *
314 load_identity(const char *filename, char **commentp)
315 {
316 char *prompt, *pass;
317 struct sshkey *prv;
318 int r;
319
320 if (commentp != NULL)
321 *commentp = NULL;
322 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0)
323 return prv;
324 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
325 fatal_r(r, "Load key \"%s\"", filename);
326 if (identity_passphrase)
327 pass = xstrdup(identity_passphrase);
328 else {
329 xasprintf(&prompt, "Enter passphrase for \"%s\": ", filename);
330 pass = read_passphrase(prompt, RP_ALLOW_STDIN);
331 free(prompt);
332 }
333 r = sshkey_load_private(filename, pass, &prv, commentp);
334 freezero(pass, strlen(pass));
335 if (r != 0)
336 fatal_r(r, "Load key \"%s\"", filename);
337 return prv;
338 }
339
340 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
341 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
342 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
343 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
344
345 #ifdef WITH_OPENSSL
346 static void
347 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
348 {
349 struct sshbuf *b;
350 char comment[61], *b64;
351 int r;
352
353 if ((b = sshbuf_new()) == NULL)
354 fatal_f("sshbuf_new failed");
355 if ((r = sshkey_putb(k, b)) != 0)
356 fatal_fr(r, "put key");
357 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
358 fatal_f("sshbuf_dtob64_string failed");
359
360 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
361 snprintf(comment, sizeof(comment),
362 "%u-bit %s, converted by %s@%s from OpenSSH",
363 sshkey_size(k), sshkey_type(k),
364 pw->pw_name, hostname);
365
366 sshkey_free(k);
367 sshbuf_free(b);
368
369 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
370 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
371 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
372 free(b64);
373 exit(0);
374 }
375
376 static void
377 do_convert_to_pkcs8(struct sshkey *k)
378 {
379 switch (sshkey_type_plain(k->type)) {
380 case KEY_RSA:
381 if (!PEM_write_RSA_PUBKEY(stdout,
382 EVP_PKEY_get0_RSA(k->pkey)))
383 fatal("PEM_write_RSA_PUBKEY failed");
384 break;
385 #ifdef WITH_DSA
386 case KEY_DSA:
387 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
388 fatal("PEM_write_DSA_PUBKEY failed");
389 break;
390 #endif
391 #ifdef OPENSSL_HAS_ECC
392 case KEY_ECDSA:
393 if (!PEM_write_EC_PUBKEY(stdout,
394 EVP_PKEY_get0_EC_KEY(k->pkey)))
395 fatal("PEM_write_EC_PUBKEY failed");
396 break;
397 #endif
398 default:
399 fatal_f("unsupported key type %s", sshkey_type(k));
400 }
401 exit(0);
402 }
403
404 static void
405 do_convert_to_pem(struct sshkey *k)
406 {
407 switch (sshkey_type_plain(k->type)) {
408 case KEY_RSA:
409 if (!PEM_write_RSAPublicKey(stdout,
410 EVP_PKEY_get0_RSA(k->pkey)))
411 fatal("PEM_write_RSAPublicKey failed");
412 break;
413 #ifdef WITH_DSA
414 case KEY_DSA:
415 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
416 fatal("PEM_write_DSA_PUBKEY failed");
417 break;
418 #endif
419 #ifdef OPENSSL_HAS_ECC
420 case KEY_ECDSA:
421 if (!PEM_write_EC_PUBKEY(stdout,
422 EVP_PKEY_get0_EC_KEY(k->pkey)))
423 fatal("PEM_write_EC_PUBKEY failed");
424 break;
425 #endif
426 default:
427 fatal_f("unsupported key type %s", sshkey_type(k));
428 }
429 exit(0);
430 }
431
432 static void
433 do_convert_to(struct passwd *pw)
434 {
435 struct sshkey *k;
436 struct stat st;
437 int r;
438
439 if (!have_identity)
440 ask_filename(pw, "Enter file in which the key is");
441 if (stat(identity_file, &st) == -1)
442 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
443 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
444 k = load_identity(identity_file, NULL);
445 switch (convert_format) {
446 case FMT_RFC4716:
447 do_convert_to_ssh2(pw, k);
448 break;
449 case FMT_PKCS8:
450 do_convert_to_pkcs8(k);
451 break;
452 case FMT_PEM:
453 do_convert_to_pem(k);
454 break;
455 default:
456 fatal_f("unknown key format %d", convert_format);
457 }
458 exit(0);
459 }
460
461 /*
462 * This is almost exactly the bignum1 encoding, but with 32 bit for length
463 * instead of 16.
464 */
465 static void
466 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
467 {
468 u_int bytes, bignum_bits;
469 int r;
470
471 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
472 fatal_fr(r, "parse");
473 bytes = (bignum_bits + 7) / 8;
474 if (sshbuf_len(b) < bytes)
475 fatal_f("input buffer too small: need %d have %zu",
476 bytes, sshbuf_len(b));
477 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
478 fatal_f("BN_bin2bn failed");
479 if ((r = sshbuf_consume(b, bytes)) != 0)
480 fatal_fr(r, "consume");
481 }
482
483 static struct sshkey *
484 do_convert_private_ssh2(struct sshbuf *b)
485 {
486 struct sshkey *key = NULL;
487 char *type, *cipher;
488 const char *alg = NULL;
489 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
490 int r, rlen, ktype;
491 u_int magic, i1, i2, i3, i4;
492 size_t slen;
493 u_long e;
494 #ifdef WITH_DSA
495 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
496 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
497 #endif
498 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
499 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
500 BIGNUM *rsa_dmp1 = NULL, *rsa_dmq1 = NULL;
501 RSA *rsa = NULL;
502
503 if ((r = sshbuf_get_u32(b, &magic)) != 0)
504 fatal_fr(r, "parse magic");
505
506 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
507 error("bad magic 0x%x != 0x%x", magic,
508 SSH_COM_PRIVATE_KEY_MAGIC);
509 return NULL;
510 }
511 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
512 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
513 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
514 (r = sshbuf_get_u32(b, &i2)) != 0 ||
515 (r = sshbuf_get_u32(b, &i3)) != 0 ||
516 (r = sshbuf_get_u32(b, &i4)) != 0)
517 fatal_fr(r, "parse");
518 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
519 if (strcmp(cipher, "none") != 0) {
520 error("unsupported cipher %s", cipher);
521 free(cipher);
522 free(type);
523 return NULL;
524 }
525 free(cipher);
526
527 if (strstr(type, "rsa")) {
528 ktype = KEY_RSA;
529 #ifdef WITH_DSA
530 } else if (strstr(type, "dsa")) {
531 ktype = KEY_DSA;
532 #endif
533 } else {
534 free(type);
535 return NULL;
536 }
537 if ((key = sshkey_new(ktype)) == NULL)
538 fatal("sshkey_new failed");
539 free(type);
540
541 switch (key->type) {
542 #ifdef WITH_DSA
543 case KEY_DSA:
544 if ((dsa_p = BN_new()) == NULL ||
545 (dsa_q = BN_new()) == NULL ||
546 (dsa_g = BN_new()) == NULL ||
547 (dsa_pub_key = BN_new()) == NULL ||
548 (dsa_priv_key = BN_new()) == NULL)
549 fatal_f("BN_new");
550 buffer_get_bignum_bits(b, dsa_p);
551 buffer_get_bignum_bits(b, dsa_g);
552 buffer_get_bignum_bits(b, dsa_q);
553 buffer_get_bignum_bits(b, dsa_pub_key);
554 buffer_get_bignum_bits(b, dsa_priv_key);
555 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
556 fatal_f("DSA_set0_pqg failed");
557 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
558 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
559 fatal_f("DSA_set0_key failed");
560 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
561 break;
562 #endif
563 case KEY_RSA:
564 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
565 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
566 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
567 fatal_fr(r, "parse RSA");
568 e = e1;
569 debug("e %lx", e);
570 if (e < 30) {
571 e <<= 8;
572 e += e2;
573 debug("e %lx", e);
574 e <<= 8;
575 e += e3;
576 debug("e %lx", e);
577 }
578 if ((rsa_e = BN_new()) == NULL)
579 fatal_f("BN_new");
580 if (!BN_set_word(rsa_e, e)) {
581 BN_clear_free(rsa_e);
582 sshkey_free(key);
583 return NULL;
584 }
585 if ((rsa_n = BN_new()) == NULL ||
586 (rsa_d = BN_new()) == NULL ||
587 (rsa_p = BN_new()) == NULL ||
588 (rsa_q = BN_new()) == NULL ||
589 (rsa_iqmp = BN_new()) == NULL)
590 fatal_f("BN_new");
591 buffer_get_bignum_bits(b, rsa_d);
592 buffer_get_bignum_bits(b, rsa_n);
593 buffer_get_bignum_bits(b, rsa_iqmp);
594 buffer_get_bignum_bits(b, rsa_q);
595 buffer_get_bignum_bits(b, rsa_p);
596 if ((r = ssh_rsa_complete_crt_parameters(rsa_d, rsa_p, rsa_q,
597 rsa_iqmp, &rsa_dmp1, &rsa_dmq1)) != 0)
598 fatal_fr(r, "generate RSA CRT parameters");
599 if ((key->pkey = EVP_PKEY_new()) == NULL)
600 fatal_f("EVP_PKEY_new failed");
601 if ((rsa = RSA_new()) == NULL)
602 fatal_f("RSA_new failed");
603 if (!RSA_set0_key(rsa, rsa_n, rsa_e, rsa_d))
604 fatal_f("RSA_set0_key failed");
605 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
606 if (!RSA_set0_factors(rsa, rsa_p, rsa_q))
607 fatal_f("RSA_set0_factors failed");
608 rsa_p = rsa_q = NULL; /* transferred */
609 if (RSA_set0_crt_params(rsa, rsa_dmp1, rsa_dmq1, rsa_iqmp) != 1)
610 fatal_f("RSA_set0_crt_params failed");
611 rsa_dmp1 = rsa_dmq1 = rsa_iqmp = NULL;
612 if (EVP_PKEY_set1_RSA(key->pkey, rsa) != 1)
613 fatal_f("EVP_PKEY_set1_RSA failed");
614 RSA_free(rsa);
615 alg = "rsa-sha2-256";
616 break;
617 }
618 rlen = sshbuf_len(b);
619 if (rlen != 0)
620 error_f("remaining bytes in key blob %d", rlen);
621
622 /* try the key */
623 if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data),
624 alg, NULL, NULL, 0)) != 0)
625 error_fr(r, "signing with converted key failed");
626 else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
627 alg, 0, NULL)) != 0)
628 error_fr(r, "verification with converted key failed");
629 if (r != 0) {
630 sshkey_free(key);
631 free(sig);
632 return NULL;
633 }
634 free(sig);
635 return key;
636 }
637
638 static int
639 get_line(FILE *fp, char *line, size_t len)
640 {
641 int c;
642 size_t pos = 0;
643
644 line[0] = '\0';
645 while ((c = fgetc(fp)) != EOF) {
646 if (pos >= len - 1)
647 fatal("input line too long.");
648 switch (c) {
649 case '\r':
650 c = fgetc(fp);
651 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
652 fatal("unget: %s", strerror(errno));
653 return pos;
654 case '\n':
655 return pos;
656 }
657 line[pos++] = c;
658 line[pos] = '\0';
659 }
660 /* We reached EOF */
661 return -1;
662 }
663
664 static void
665 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
666 {
667 int r, blen, escaped = 0;
668 u_int len;
669 char line[1024];
670 struct sshbuf *buf;
671 char encoded[8096];
672 FILE *fp;
673
674 if ((buf = sshbuf_new()) == NULL)
675 fatal("sshbuf_new failed");
676 if ((fp = fopen(identity_file, "r")) == NULL)
677 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
678 encoded[0] = '\0';
679 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
680 if (blen > 0 && line[blen - 1] == '\\')
681 escaped++;
682 if (strncmp(line, "----", 4) == 0 ||
683 strstr(line, ": ") != NULL) {
684 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
685 *private = 1;
686 if (strstr(line, " END ") != NULL) {
687 break;
688 }
689 /* fprintf(stderr, "ignore: %s", line); */
690 continue;
691 }
692 if (escaped) {
693 escaped--;
694 /* fprintf(stderr, "escaped: %s", line); */
695 continue;
696 }
697 strlcat(encoded, line, sizeof(encoded));
698 }
699 len = strlen(encoded);
700 if (((len % 4) == 3) &&
701 (encoded[len-1] == '=') &&
702 (encoded[len-2] == '=') &&
703 (encoded[len-3] == '='))
704 encoded[len-3] = '\0';
705 if ((r = sshbuf_b64tod(buf, encoded)) != 0)
706 fatal_fr(r, "base64 decode");
707 if (*private) {
708 if ((*k = do_convert_private_ssh2(buf)) == NULL)
709 fatal_f("private key conversion failed");
710 } else if ((r = sshkey_fromb(buf, k)) != 0)
711 fatal_fr(r, "parse key");
712 sshbuf_free(buf);
713 fclose(fp);
714 }
715
716 static void
717 do_convert_from_pkcs8(struct sshkey **k, int *private)
718 {
719 EVP_PKEY *pubkey;
720 FILE *fp;
721
722 if ((fp = fopen(identity_file, "r")) == NULL)
723 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
724 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
725 fatal_f("%s is not a recognised public key format",
726 identity_file);
727 }
728 fclose(fp);
729 switch (EVP_PKEY_base_id(pubkey)) {
730 case EVP_PKEY_RSA:
731 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
732 fatal("sshkey_new failed");
733 (*k)->type = KEY_RSA;
734 (*k)->pkey = pubkey;
735 pubkey = NULL;
736 break;
737 #ifdef WITH_DSA
738 case EVP_PKEY_DSA:
739 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
740 fatal("sshkey_new failed");
741 (*k)->type = KEY_DSA;
742 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
743 break;
744 #endif
745 #ifdef OPENSSL_HAS_ECC
746 case EVP_PKEY_EC:
747 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
748 fatal("sshkey_new failed");
749 if (((*k)->ecdsa_nid = sshkey_ecdsa_fixup_group(pubkey)) == -1)
750 fatal("sshkey_ecdsa_fixup_group failed");
751 (*k)->type = KEY_ECDSA;
752 (*k)->pkey = pubkey;
753 pubkey = NULL;
754 break;
755 #endif
756 default:
757 fatal_f("unsupported pubkey type %d",
758 EVP_PKEY_base_id(pubkey));
759 }
760 EVP_PKEY_free(pubkey);
761 return;
762 }
763
764 static void
765 do_convert_from_pem(struct sshkey **k, int *private)
766 {
767 FILE *fp;
768 RSA *rsa;
769
770 if ((fp = fopen(identity_file, "r")) == NULL)
771 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
772 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
773 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
774 fatal("sshkey_new failed");
775 if (((*k)->pkey = EVP_PKEY_new()) == NULL)
776 fatal("EVP_PKEY_new failed");
777 (*k)->type = KEY_RSA;
778 if (EVP_PKEY_set1_RSA((*k)->pkey, rsa) != 1)
779 fatal("EVP_PKEY_set1_RSA failed");
780 RSA_free(rsa);
781 fclose(fp);
782 return;
783 }
784 fatal_f("unrecognised raw private key format");
785 }
786
787 static void
788 do_convert_from(struct passwd *pw)
789 {
790 struct sshkey *k = NULL;
791 int r, private = 0, ok = 0;
792 struct stat st;
793
794 if (!have_identity)
795 ask_filename(pw, "Enter file in which the key is");
796 if (stat(identity_file, &st) == -1)
797 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
798
799 switch (convert_format) {
800 case FMT_RFC4716:
801 do_convert_from_ssh2(pw, &k, &private);
802 break;
803 case FMT_PKCS8:
804 do_convert_from_pkcs8(&k, &private);
805 break;
806 case FMT_PEM:
807 do_convert_from_pem(&k, &private);
808 break;
809 default:
810 fatal_f("unknown key format %d", convert_format);
811 }
812
813 if (!private) {
814 if ((r = sshkey_write(k, stdout)) == 0)
815 ok = 1;
816 if (ok)
817 fprintf(stdout, "\n");
818 } else {
819 switch (k->type) {
820 #ifdef WITH_DSA
821 case KEY_DSA:
822 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
823 NULL, 0, NULL, NULL);
824 break;
825 #endif
826 #ifdef OPENSSL_HAS_ECC
827 case KEY_ECDSA:
828 ok = PEM_write_ECPrivateKey(stdout,
829 EVP_PKEY_get0_EC_KEY(k->pkey), NULL, NULL, 0,
830 NULL, NULL);
831 break;
832 #endif
833 case KEY_RSA:
834 ok = PEM_write_RSAPrivateKey(stdout,
835 EVP_PKEY_get0_RSA(k->pkey), NULL, NULL, 0,
836 NULL, NULL);
837 break;
838 default:
839 fatal_f("unsupported key type %s", sshkey_type(k));
840 }
841 }
842
843 if (!ok)
844 fatal("key write failed");
845 sshkey_free(k);
846 exit(0);
847 }
848 #endif
849
850 static void
851 do_print_public(struct passwd *pw)
852 {
853 struct sshkey *prv;
854 struct stat st;
855 int r;
856 char *comment = NULL;
857
858 if (!have_identity)
859 ask_filename(pw, "Enter file in which the key is");
860 if (stat(identity_file, &st) == -1)
861 fatal("%s: %s", identity_file, strerror(errno));
862 prv = load_identity(identity_file, &comment);
863 if ((r = sshkey_write(prv, stdout)) != 0)
864 fatal_fr(r, "write key");
865 if (comment != NULL && *comment != '\0')
866 fprintf(stdout, " %s", comment);
867 fprintf(stdout, "\n");
868 if (sshkey_is_sk(prv)) {
869 debug("sk_application: \"%s\", sk_flags 0x%02x",
870 prv->sk_application, prv->sk_flags);
871 }
872 sshkey_free(prv);
873 free(comment);
874 exit(0);
875 }
876
877 static void
878 do_download(struct passwd *pw)
879 {
880 #ifdef ENABLE_PKCS11
881 struct sshkey **keys = NULL;
882 int i, nkeys;
883 enum sshkey_fp_rep rep;
884 int fptype;
885 char *fp, *ra, **comments = NULL;
886
887 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
888 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
889
890 pkcs11_init(1);
891 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments);
892 if (nkeys <= 0)
893 fatal("cannot read public key from pkcs11");
894 for (i = 0; i < nkeys; i++) {
895 if (print_fingerprint) {
896 fp = sshkey_fingerprint(keys[i], fptype, rep);
897 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
898 SSH_FP_RANDOMART);
899 if (fp == NULL || ra == NULL)
900 fatal_f("sshkey_fingerprint fail");
901 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
902 fp, sshkey_type(keys[i]));
903 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
904 printf("%s\n", ra);
905 free(ra);
906 free(fp);
907 } else {
908 (void) sshkey_write(keys[i], stdout); /* XXX check */
909 fprintf(stdout, "%s%s\n",
910 *(comments[i]) == '\0' ? "" : " ", comments[i]);
911 }
912 free(comments[i]);
913 sshkey_free(keys[i]);
914 }
915 free(comments);
916 free(keys);
917 pkcs11_terminate();
918 exit(0);
919 #else
920 fatal("no pkcs11 support");
921 #endif /* ENABLE_PKCS11 */
922 }
923
924 static struct sshkey *
925 try_read_key(char **cpp)
926 {
927 struct sshkey *ret;
928 int r;
929
930 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
931 fatal("sshkey_new failed");
932 if ((r = sshkey_read(ret, cpp)) == 0)
933 return ret;
934 /* Not a key */
935 sshkey_free(ret);
936 return NULL;
937 }
938
939 static void
940 fingerprint_one_key(const struct sshkey *public, const char *comment)
941 {
942 char *fp = NULL, *ra = NULL;
943 enum sshkey_fp_rep rep;
944 int fptype;
945
946 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
947 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
948 fp = sshkey_fingerprint(public, fptype, rep);
949 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
950 if (fp == NULL || ra == NULL)
951 fatal_f("sshkey_fingerprint failed");
952 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
953 comment ? comment : "no comment", sshkey_type(public));
954 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
955 printf("%s\n", ra);
956 free(ra);
957 free(fp);
958 }
959
960 static void
961 fingerprint_private(const char *path)
962 {
963 struct stat st;
964 char *comment = NULL;
965 struct sshkey *privkey = NULL, *pubkey = NULL;
966 int r;
967
968 if (stat(identity_file, &st) == -1)
969 fatal("%s: %s", path, strerror(errno));
970 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0)
971 debug_r(r, "load public \"%s\"", path);
972 if (pubkey == NULL || comment == NULL || *comment == '\0') {
973 free(comment);
974 if ((r = sshkey_load_private(path, NULL,
975 &privkey, &comment)) != 0)
976 debug_r(r, "load private \"%s\"", path);
977 }
978 if (pubkey == NULL && privkey == NULL)
979 fatal("%s is not a key file.", path);
980
981 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment);
982 sshkey_free(pubkey);
983 sshkey_free(privkey);
984 free(comment);
985 }
986
987 static void
988 do_fingerprint(struct passwd *pw)
989 {
990 FILE *f;
991 struct sshkey *public = NULL;
992 char *comment = NULL, *cp, *ep, *line = NULL;
993 size_t linesize = 0;
994 int i, invalid = 1;
995 const char *path;
996 u_long lnum = 0;
997
998 if (!have_identity)
999 ask_filename(pw, "Enter file in which the key is");
1000 path = identity_file;
1001
1002 if (strcmp(identity_file, "-") == 0) {
1003 f = stdin;
1004 path = "(stdin)";
1005 } else if ((f = fopen(path, "r")) == NULL)
1006 fatal("%s: %s: %s", __progname, path, strerror(errno));
1007
1008 while (getline(&line, &linesize, f) != -1) {
1009 lnum++;
1010 cp = line;
1011 cp[strcspn(cp, "\r\n")] = '\0';
1012 /* Trim leading space and comments */
1013 cp = line + strspn(line, " \t");
1014 if (*cp == '#' || *cp == '\0')
1015 continue;
1016
1017 /*
1018 * Input may be plain keys, private keys, authorized_keys
1019 * or known_hosts.
1020 */
1021
1022 /*
1023 * Try private keys first. Assume a key is private if
1024 * "SSH PRIVATE KEY" appears on the first line and we're
1025 * not reading from stdin (XXX support private keys on stdin).
1026 */
1027 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
1028 strstr(cp, "PRIVATE KEY") != NULL) {
1029 free(line);
1030 fclose(f);
1031 fingerprint_private(path);
1032 exit(0);
1033 }
1034
1035 /*
1036 * If it's not a private key, then this must be prepared to
1037 * accept a public key prefixed with a hostname or options.
1038 * Try a bare key first, otherwise skip the leading stuff.
1039 */
1040 comment = NULL;
1041 if ((public = try_read_key(&cp)) == NULL) {
1042 i = strtol(cp, &ep, 10);
1043 if (i == 0 || ep == NULL ||
1044 (*ep != ' ' && *ep != '\t')) {
1045 int quoted = 0;
1046
1047 comment = cp;
1048 for (; *cp && (quoted || (*cp != ' ' &&
1049 *cp != '\t')); cp++) {
1050 if (*cp == '\\' && cp[1] == '"')
1051 cp++; /* Skip both */
1052 else if (*cp == '"')
1053 quoted = !quoted;
1054 }
1055 if (!*cp)
1056 continue;
1057 *cp++ = '\0';
1058 }
1059 }
1060 /* Retry after parsing leading hostname/key options */
1061 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
1062 debug("%s:%lu: not a public key", path, lnum);
1063 continue;
1064 }
1065
1066 /* Find trailing comment, if any */
1067 for (; *cp == ' ' || *cp == '\t'; cp++)
1068 ;
1069 if (*cp != '\0' && *cp != '#')
1070 comment = cp;
1071
1072 fingerprint_one_key(public, comment);
1073 sshkey_free(public);
1074 invalid = 0; /* One good key in the file is sufficient */
1075 }
1076 fclose(f);
1077 free(line);
1078
1079 if (invalid)
1080 fatal("%s is not a public key file.", path);
1081 exit(0);
1082 }
1083
1084 static void
1085 do_gen_all_hostkeys(struct passwd *pw)
1086 {
1087 struct {
1088 char *key_type;
1089 char *key_type_display;
1090 char *path;
1091 } key_types[] = {
1092 #ifdef WITH_OPENSSL
1093 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
1094 #ifdef OPENSSL_HAS_ECC
1095 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
1096 #endif /* OPENSSL_HAS_ECC */
1097 #endif /* WITH_OPENSSL */
1098 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
1099 #ifdef WITH_XMSS
1100 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE },
1101 #endif /* WITH_XMSS */
1102 { NULL, NULL, NULL }
1103 };
1104
1105 u_int32_t bits = 0;
1106 int first = 0;
1107 struct stat st;
1108 struct sshkey *private, *public;
1109 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1110 int i, type, fd, r;
1111
1112 for (i = 0; key_types[i].key_type; i++) {
1113 public = private = NULL;
1114 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1115
1116 xasprintf(&prv_file, "%s%s",
1117 identity_file, key_types[i].path);
1118
1119 /* Check whether private key exists and is not zero-length */
1120 if (stat(prv_file, &st) == 0) {
1121 if (st.st_size != 0)
1122 goto next;
1123 } else if (errno != ENOENT) {
1124 error("Could not stat %s: %s", key_types[i].path,
1125 strerror(errno));
1126 goto failnext;
1127 }
1128
1129 /*
1130 * Private key doesn't exist or is invalid; proceed with
1131 * key generation.
1132 */
1133 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1134 identity_file, key_types[i].path);
1135 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1136 identity_file, key_types[i].path);
1137 xasprintf(&pub_file, "%s%s.pub",
1138 identity_file, key_types[i].path);
1139
1140 if (first == 0) {
1141 first = 1;
1142 printf("%s: generating new host keys: ", __progname);
1143 }
1144 printf("%s ", key_types[i].key_type_display);
1145 fflush(stdout);
1146 type = sshkey_type_from_shortname(key_types[i].key_type);
1147 if ((fd = mkstemp(prv_tmp)) == -1) {
1148 error("Could not save your private key in %s: %s",
1149 prv_tmp, strerror(errno));
1150 goto failnext;
1151 }
1152 (void)close(fd); /* just using mkstemp() to reserve a name */
1153 bits = 0;
1154 type_bits_valid(type, NULL, &bits);
1155 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1156 error_r(r, "sshkey_generate failed");
1157 goto failnext;
1158 }
1159 if ((r = sshkey_from_private(private, &public)) != 0)
1160 fatal_fr(r, "sshkey_from_private");
1161 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1162 hostname);
1163 if ((r = sshkey_save_private(private, prv_tmp, "",
1164 comment, private_key_format, openssh_format_cipher,
1165 rounds)) != 0) {
1166 error_r(r, "Saving key \"%s\" failed", prv_tmp);
1167 goto failnext;
1168 }
1169 if ((fd = mkstemp(pub_tmp)) == -1) {
1170 error("Could not save your public key in %s: %s",
1171 pub_tmp, strerror(errno));
1172 goto failnext;
1173 }
1174 (void)fchmod(fd, 0644);
1175 (void)close(fd);
1176 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) {
1177 error_r(r, "Unable to save public key to %s",
1178 identity_file);
1179 goto failnext;
1180 }
1181
1182 /* Rename temporary files to their permanent locations. */
1183 if (rename(pub_tmp, pub_file) != 0) {
1184 error("Unable to move %s into position: %s",
1185 pub_file, strerror(errno));
1186 goto failnext;
1187 }
1188 if (rename(prv_tmp, prv_file) != 0) {
1189 error("Unable to move %s into position: %s",
1190 key_types[i].path, strerror(errno));
1191 failnext:
1192 first = 0;
1193 goto next;
1194 }
1195 next:
1196 sshkey_free(private);
1197 sshkey_free(public);
1198 free(prv_tmp);
1199 free(pub_tmp);
1200 free(prv_file);
1201 free(pub_file);
1202 }
1203 if (first != 0)
1204 printf("\n");
1205 }
1206
1207 struct known_hosts_ctx {
1208 const char *host; /* Hostname searched for in find/delete case */
1209 FILE *out; /* Output file, stdout for find_hosts case */
1210 int has_unhashed; /* When hashing, original had unhashed hosts */
1211 int found_key; /* For find/delete, host was found */
1212 int invalid; /* File contained invalid items; don't delete */
1213 int hash_hosts; /* Hash hostnames as we go */
1214 int find_host; /* Search for specific hostname */
1215 int delete_host; /* Delete host from known_hosts */
1216 };
1217
1218 static int
1219 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1220 {
1221 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1222 char *hashed, *cp, *hosts, *ohosts;
1223 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1224 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1225
1226 switch (l->status) {
1227 case HKF_STATUS_OK:
1228 case HKF_STATUS_MATCHED:
1229 /*
1230 * Don't hash hosts already hashed, with wildcard
1231 * characters or a CA/revocation marker.
1232 */
1233 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1234 fprintf(ctx->out, "%s\n", l->line);
1235 if (has_wild && !ctx->find_host) {
1236 logit("%s:%lu: ignoring host name "
1237 "with wildcard: %.64s", l->path,
1238 l->linenum, l->hosts);
1239 }
1240 return 0;
1241 }
1242 /*
1243 * Split any comma-separated hostnames from the host list,
1244 * hash and store separately.
1245 */
1246 ohosts = hosts = xstrdup(l->hosts);
1247 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1248 lowercase(cp);
1249 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1250 fatal("hash_host failed");
1251 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1252 free(hashed);
1253 ctx->has_unhashed = 1;
1254 }
1255 free(ohosts);
1256 return 0;
1257 case HKF_STATUS_INVALID:
1258 /* Retain invalid lines, but mark file as invalid. */
1259 ctx->invalid = 1;
1260 logit("%s:%lu: invalid line", l->path, l->linenum);
1261 /* FALLTHROUGH */
1262 default:
1263 fprintf(ctx->out, "%s\n", l->line);
1264 return 0;
1265 }
1266 /* NOTREACHED */
1267 return -1;
1268 }
1269
1270 static int
1271 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1272 {
1273 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1274 enum sshkey_fp_rep rep;
1275 int fptype;
1276 char *fp = NULL, *ra = NULL;
1277
1278 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1279 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1280
1281 if (l->status == HKF_STATUS_MATCHED) {
1282 if (ctx->delete_host) {
1283 if (l->marker != MRK_NONE) {
1284 /* Don't remove CA and revocation lines */
1285 fprintf(ctx->out, "%s\n", l->line);
1286 } else {
1287 /*
1288 * Hostname matches and has no CA/revoke
1289 * marker, delete it by *not* writing the
1290 * line to ctx->out.
1291 */
1292 ctx->found_key = 1;
1293 if (!quiet)
1294 printf("# Host %s found: line %lu\n",
1295 ctx->host, l->linenum);
1296 }
1297 return 0;
1298 } else if (ctx->find_host) {
1299 ctx->found_key = 1;
1300 if (!quiet) {
1301 printf("# Host %s found: line %lu %s\n",
1302 ctx->host,
1303 l->linenum, l->marker == MRK_CA ? "CA" :
1304 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1305 }
1306 if (ctx->hash_hosts)
1307 known_hosts_hash(l, ctx);
1308 else if (print_fingerprint) {
1309 fp = sshkey_fingerprint(l->key, fptype, rep);
1310 ra = sshkey_fingerprint(l->key,
1311 fingerprint_hash, SSH_FP_RANDOMART);
1312 if (fp == NULL || ra == NULL)
1313 fatal_f("sshkey_fingerprint failed");
1314 mprintf("%s %s %s%s%s\n", ctx->host,
1315 sshkey_type(l->key), fp,
1316 l->comment[0] ? " " : "",
1317 l->comment);
1318 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
1319 printf("%s\n", ra);
1320 free(ra);
1321 free(fp);
1322 } else
1323 fprintf(ctx->out, "%s\n", l->line);
1324 return 0;
1325 }
1326 } else if (ctx->delete_host) {
1327 /* Retain non-matching hosts when deleting */
1328 if (l->status == HKF_STATUS_INVALID) {
1329 ctx->invalid = 1;
1330 logit("%s:%lu: invalid line", l->path, l->linenum);
1331 }
1332 fprintf(ctx->out, "%s\n", l->line);
1333 }
1334 return 0;
1335 }
1336
1337 static void
1338 do_known_hosts(struct passwd *pw, const char *name, int find_host,
1339 int delete_host, int hash_hosts)
1340 {
1341 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1342 int r, fd, oerrno, inplace = 0;
1343 struct known_hosts_ctx ctx;
1344 u_int foreach_options;
1345 struct stat sb;
1346
1347 if (!have_identity) {
1348 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1349 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1350 sizeof(identity_file))
1351 fatal("Specified known hosts path too long");
1352 free(cp);
1353 have_identity = 1;
1354 }
1355 if (stat(identity_file, &sb) != 0)
1356 fatal("Cannot stat %s: %s", identity_file, strerror(errno));
1357
1358 memset(&ctx, 0, sizeof(ctx));
1359 ctx.out = stdout;
1360 ctx.host = name;
1361 ctx.hash_hosts = hash_hosts;
1362 ctx.find_host = find_host;
1363 ctx.delete_host = delete_host;
1364
1365 /*
1366 * Find hosts goes to stdout, hash and deletions happen in-place
1367 * A corner case is ssh-keygen -HF foo, which should go to stdout
1368 */
1369 if (!find_host && (hash_hosts || delete_host)) {
1370 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1371 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1372 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1373 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1374 fatal("known_hosts path too long");
1375 umask(077);
1376 if ((fd = mkstemp(tmp)) == -1)
1377 fatal("mkstemp: %s", strerror(errno));
1378 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1379 oerrno = errno;
1380 unlink(tmp);
1381 fatal("fdopen: %s", strerror(oerrno));
1382 }
1383 (void)fchmod(fd, sb.st_mode & 0644);
1384 inplace = 1;
1385 }
1386 /* XXX support identity_file == "-" for stdin */
1387 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1388 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1389 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ?
1390 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL,
1391 foreach_options, 0)) != 0) {
1392 if (inplace)
1393 unlink(tmp);
1394 fatal_fr(r, "hostkeys_foreach");
1395 }
1396
1397 if (inplace)
1398 fclose(ctx.out);
1399
1400 if (ctx.invalid) {
1401 error("%s is not a valid known_hosts file.", identity_file);
1402 if (inplace) {
1403 error("Not replacing existing known_hosts "
1404 "file because of errors");
1405 unlink(tmp);
1406 }
1407 exit(1);
1408 } else if (delete_host && !ctx.found_key) {
1409 logit("Host %s not found in %s", name, identity_file);
1410 if (inplace)
1411 unlink(tmp);
1412 } else if (inplace) {
1413 /* Backup existing file */
1414 if (unlink(old) == -1 && errno != ENOENT)
1415 fatal("unlink %.100s: %s", old, strerror(errno));
1416 if (link(identity_file, old) == -1)
1417 fatal("link %.100s to %.100s: %s", identity_file, old,
1418 strerror(errno));
1419 /* Move new one into place */
1420 if (rename(tmp, identity_file) == -1) {
1421 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1422 strerror(errno));
1423 unlink(tmp);
1424 unlink(old);
1425 exit(1);
1426 }
1427
1428 printf("%s updated.\n", identity_file);
1429 printf("Original contents retained as %s\n", old);
1430 if (ctx.has_unhashed) {
1431 logit("WARNING: %s contains unhashed entries", old);
1432 logit("Delete this file to ensure privacy "
1433 "of hostnames");
1434 }
1435 }
1436
1437 exit (find_host && !ctx.found_key);
1438 }
1439
1440 /*
1441 * Perform changing a passphrase. The argument is the passwd structure
1442 * for the current user.
1443 */
1444 static void
1445 do_change_passphrase(struct passwd *pw)
1446 {
1447 char *comment;
1448 char *old_passphrase, *passphrase1, *passphrase2;
1449 struct stat st;
1450 struct sshkey *private;
1451 int r;
1452
1453 if (!have_identity)
1454 ask_filename(pw, "Enter file in which the key is");
1455 if (stat(identity_file, &st) == -1)
1456 fatal("%s: %s", identity_file, strerror(errno));
1457 /* Try to load the file with empty passphrase. */
1458 r = sshkey_load_private(identity_file, "", &private, &comment);
1459 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1460 if (identity_passphrase)
1461 old_passphrase = xstrdup(identity_passphrase);
1462 else
1463 old_passphrase =
1464 read_passphrase("Enter old passphrase: ",
1465 RP_ALLOW_STDIN);
1466 r = sshkey_load_private(identity_file, old_passphrase,
1467 &private, &comment);
1468 freezero(old_passphrase, strlen(old_passphrase));
1469 if (r != 0)
1470 goto badkey;
1471 } else if (r != 0) {
1472 badkey:
1473 fatal_r(r, "Failed to load key %s", identity_file);
1474 }
1475 if (comment)
1476 mprintf("Key has comment '%s'\n", comment);
1477
1478 /* Ask the new passphrase (twice). */
1479 if (identity_new_passphrase) {
1480 passphrase1 = xstrdup(identity_new_passphrase);
1481 passphrase2 = NULL;
1482 } else {
1483 passphrase1 =
1484 read_passphrase("Enter new passphrase (empty for no "
1485 "passphrase): ", RP_ALLOW_STDIN);
1486 passphrase2 = read_passphrase("Enter same passphrase again: ",
1487 RP_ALLOW_STDIN);
1488
1489 /* Verify that they are the same. */
1490 if (strcmp(passphrase1, passphrase2) != 0) {
1491 explicit_bzero(passphrase1, strlen(passphrase1));
1492 explicit_bzero(passphrase2, strlen(passphrase2));
1493 free(passphrase1);
1494 free(passphrase2);
1495 printf("Pass phrases do not match. Try again.\n");
1496 exit(1);
1497 }
1498 /* Destroy the other copy. */
1499 freezero(passphrase2, strlen(passphrase2));
1500 }
1501
1502 /* Save the file using the new passphrase. */
1503 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1504 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
1505 error_r(r, "Saving key \"%s\" failed", identity_file);
1506 freezero(passphrase1, strlen(passphrase1));
1507 sshkey_free(private);
1508 free(comment);
1509 exit(1);
1510 }
1511 /* Destroy the passphrase and the copy of the key in memory. */
1512 freezero(passphrase1, strlen(passphrase1));
1513 sshkey_free(private); /* Destroys contents */
1514 free(comment);
1515
1516 printf("Your identification has been saved with the new passphrase.\n");
1517 exit(0);
1518 }
1519
1520 /*
1521 * Print the SSHFP RR.
1522 */
1523 static int
1524 do_print_resource_record(struct passwd *pw, char *fname, char *hname,
1525 int print_generic, char * const *opts, size_t nopts)
1526 {
1527 struct sshkey *public;
1528 char *comment = NULL;
1529 struct stat st;
1530 int r, hash = -1;
1531 size_t i;
1532
1533 for (i = 0; i < nopts; i++) {
1534 if (strncasecmp(opts[i], "hashalg=", 8) == 0) {
1535 if ((hash = ssh_digest_alg_by_name(opts[i] + 8)) == -1)
1536 fatal("Unsupported hash algorithm");
1537 } else {
1538 error("Invalid option \"%s\"", opts[i]);
1539 return SSH_ERR_INVALID_ARGUMENT;
1540 }
1541 }
1542 if (fname == NULL)
1543 fatal_f("no filename");
1544 if (stat(fname, &st) == -1) {
1545 if (errno == ENOENT)
1546 return 0;
1547 fatal("%s: %s", fname, strerror(errno));
1548 }
1549 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1550 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname);
1551 export_dns_rr(hname, public, stdout, print_generic, hash);
1552 sshkey_free(public);
1553 free(comment);
1554 return 1;
1555 }
1556
1557 /*
1558 * Change the comment of a private key file.
1559 */
1560 static void
1561 do_change_comment(struct passwd *pw, const char *identity_comment)
1562 {
1563 char new_comment[1024], *comment, *passphrase;
1564 struct sshkey *private;
1565 struct sshkey *public;
1566 struct stat st;
1567 int r;
1568
1569 if (!have_identity)
1570 ask_filename(pw, "Enter file in which the key is");
1571 if (stat(identity_file, &st) == -1)
1572 fatal("%s: %s", identity_file, strerror(errno));
1573 if ((r = sshkey_load_private(identity_file, "",
1574 &private, &comment)) == 0)
1575 passphrase = xstrdup("");
1576 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1577 fatal_r(r, "Cannot load private key \"%s\"", identity_file);
1578 else {
1579 if (identity_passphrase)
1580 passphrase = xstrdup(identity_passphrase);
1581 else if (identity_new_passphrase)
1582 passphrase = xstrdup(identity_new_passphrase);
1583 else
1584 passphrase = read_passphrase("Enter passphrase: ",
1585 RP_ALLOW_STDIN);
1586 /* Try to load using the passphrase. */
1587 if ((r = sshkey_load_private(identity_file, passphrase,
1588 &private, &comment)) != 0) {
1589 freezero(passphrase, strlen(passphrase));
1590 fatal_r(r, "Cannot load private key \"%s\"",
1591 identity_file);
1592 }
1593 }
1594
1595 if (private->type != KEY_ED25519 && private->type != KEY_XMSS &&
1596 private_key_format != SSHKEY_PRIVATE_OPENSSH) {
1597 error("Comments are only supported for keys stored in "
1598 "the new format (-o).");
1599 explicit_bzero(passphrase, strlen(passphrase));
1600 sshkey_free(private);
1601 exit(1);
1602 }
1603 if (comment)
1604 printf("Old comment: %s\n", comment);
1605 else
1606 printf("No existing comment\n");
1607
1608 if (identity_comment) {
1609 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1610 } else {
1611 printf("New comment: ");
1612 fflush(stdout);
1613 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1614 explicit_bzero(passphrase, strlen(passphrase));
1615 sshkey_free(private);
1616 exit(1);
1617 }
1618 new_comment[strcspn(new_comment, "\n")] = '\0';
1619 }
1620 if (comment != NULL && strcmp(comment, new_comment) == 0) {
1621 printf("No change to comment\n");
1622 free(passphrase);
1623 sshkey_free(private);
1624 free(comment);
1625 exit(0);
1626 }
1627
1628 /* Save the file using the new passphrase. */
1629 if ((r = sshkey_save_private(private, identity_file, passphrase,
1630 new_comment, private_key_format, openssh_format_cipher,
1631 rounds)) != 0) {
1632 error_r(r, "Saving key \"%s\" failed", identity_file);
1633 freezero(passphrase, strlen(passphrase));
1634 sshkey_free(private);
1635 free(comment);
1636 exit(1);
1637 }
1638 freezero(passphrase, strlen(passphrase));
1639 if ((r = sshkey_from_private(private, &public)) != 0)
1640 fatal_fr(r, "sshkey_from_private");
1641 sshkey_free(private);
1642
1643 strlcat(identity_file, ".pub", sizeof(identity_file));
1644 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0)
1645 fatal_r(r, "Unable to save public key to %s", identity_file);
1646 sshkey_free(public);
1647 free(comment);
1648
1649 if (strlen(new_comment) > 0)
1650 printf("Comment '%s' applied\n", new_comment);
1651 else
1652 printf("Comment removed\n");
1653
1654 exit(0);
1655 }
1656
1657 static void
1658 cert_ext_add(const char *key, const char *value, int iscrit)
1659 {
1660 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext));
1661 cert_ext[ncert_ext].key = xstrdup(key);
1662 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value);
1663 cert_ext[ncert_ext].crit = iscrit;
1664 ncert_ext++;
1665 }
1666
1667 /* qsort(3) comparison function for certificate extensions */
1668 static int
1669 cert_ext_cmp(const void *_a, const void *_b)
1670 {
1671 const struct cert_ext *a = (const struct cert_ext *)_a;
1672 const struct cert_ext *b = (const struct cert_ext *)_b;
1673 int r;
1674
1675 if (a->crit != b->crit)
1676 return (a->crit < b->crit) ? -1 : 1;
1677 if ((r = strcmp(a->key, b->key)) != 0)
1678 return r;
1679 if ((a->val == NULL) != (b->val == NULL))
1680 return (a->val == NULL) ? -1 : 1;
1681 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0)
1682 return r;
1683 return 0;
1684 }
1685
1686 #define OPTIONS_CRITICAL 1
1687 #define OPTIONS_EXTENSIONS 2
1688 static void
1689 prepare_options_buf(struct sshbuf *c, int which)
1690 {
1691 struct sshbuf *b;
1692 size_t i;
1693 int r;
1694 const struct cert_ext *ext;
1695
1696 if ((b = sshbuf_new()) == NULL)
1697 fatal_f("sshbuf_new failed");
1698 sshbuf_reset(c);
1699 for (i = 0; i < ncert_ext; i++) {
1700 ext = &cert_ext[i];
1701 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) ||
1702 (!ext->crit && (which & OPTIONS_CRITICAL)))
1703 continue;
1704 if (ext->val == NULL) {
1705 /* flag option */
1706 debug3_f("%s", ext->key);
1707 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1708 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1709 fatal_fr(r, "prepare flag");
1710 } else {
1711 /* key/value option */
1712 debug3_f("%s=%s", ext->key, ext->val);
1713 sshbuf_reset(b);
1714 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1715 (r = sshbuf_put_cstring(b, ext->val)) != 0 ||
1716 (r = sshbuf_put_stringb(c, b)) != 0)
1717 fatal_fr(r, "prepare k/v");
1718 }
1719 }
1720 sshbuf_free(b);
1721 }
1722
1723 static void
1724 finalise_cert_exts(void)
1725 {
1726 /* critical options */
1727 if (certflags_command != NULL)
1728 cert_ext_add("force-command", certflags_command, 1);
1729 if (certflags_src_addr != NULL)
1730 cert_ext_add("source-address", certflags_src_addr, 1);
1731 if ((certflags_flags & CERTOPT_REQUIRE_VERIFY) != 0)
1732 cert_ext_add("verify-required", NULL, 1);
1733 /* extensions */
1734 if ((certflags_flags & CERTOPT_X_FWD) != 0)
1735 cert_ext_add("permit-X11-forwarding", NULL, 0);
1736 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0)
1737 cert_ext_add("permit-agent-forwarding", NULL, 0);
1738 if ((certflags_flags & CERTOPT_PORT_FWD) != 0)
1739 cert_ext_add("permit-port-forwarding", NULL, 0);
1740 if ((certflags_flags & CERTOPT_PTY) != 0)
1741 cert_ext_add("permit-pty", NULL, 0);
1742 if ((certflags_flags & CERTOPT_USER_RC) != 0)
1743 cert_ext_add("permit-user-rc", NULL, 0);
1744 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0)
1745 cert_ext_add("no-touch-required", NULL, 0);
1746 /* order lexically by key */
1747 if (ncert_ext > 0)
1748 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp);
1749 }
1750
1751 static struct sshkey *
1752 load_pkcs11_key(char *path)
1753 {
1754 #ifdef ENABLE_PKCS11
1755 struct sshkey **keys = NULL, *public, *private = NULL;
1756 int r, i, nkeys;
1757
1758 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1759 fatal_r(r, "Couldn't load CA public key \"%s\"", path);
1760
1761 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase,
1762 &keys, NULL);
1763 debug3_f("%d keys", nkeys);
1764 if (nkeys <= 0)
1765 fatal("cannot read public key from pkcs11");
1766 for (i = 0; i < nkeys; i++) {
1767 if (sshkey_equal_public(public, keys[i])) {
1768 private = keys[i];
1769 continue;
1770 }
1771 sshkey_free(keys[i]);
1772 }
1773 free(keys);
1774 sshkey_free(public);
1775 return private;
1776 #else
1777 fatal("no pkcs11 support");
1778 #endif /* ENABLE_PKCS11 */
1779 }
1780
1781 /* Signer for sshkey_certify_custom that uses the agent */
1782 static int
1783 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp,
1784 const u_char *data, size_t datalen,
1785 const char *alg, const char *provider, const char *pin,
1786 u_int compat, void *ctx)
1787 {
1788 int *agent_fdp = (int *)ctx;
1789
1790 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1791 data, datalen, alg, compat);
1792 }
1793
1794 static void
1795 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent,
1796 unsigned long long cert_serial, int cert_serial_autoinc,
1797 int argc, char **argv)
1798 {
1799 int r, i, found, agent_fd = -1;
1800 u_int n;
1801 struct sshkey *ca, *public;
1802 char valid[64], *otmp, *tmp, *cp, *out, *comment;
1803 char *ca_fp = NULL, **plist = NULL, *pin = NULL;
1804 struct ssh_identitylist *agent_ids;
1805 size_t j;
1806 struct notifier_ctx *notifier = NULL;
1807
1808 #ifdef ENABLE_PKCS11
1809 pkcs11_init(1);
1810 #endif
1811 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1812 if (pkcs11provider != NULL) {
1813 /* If a PKCS#11 token was specified then try to use it */
1814 if ((ca = load_pkcs11_key(tmp)) == NULL)
1815 fatal("No PKCS#11 key matching %s found", ca_key_path);
1816 } else if (prefer_agent) {
1817 /*
1818 * Agent signature requested. Try to use agent after making
1819 * sure the public key specified is actually present in the
1820 * agent.
1821 */
1822 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1823 fatal_r(r, "Cannot load CA public key %s", tmp);
1824 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1825 fatal_r(r, "Cannot use public key for CA signature");
1826 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1827 fatal_r(r, "Retrieve agent key list");
1828 found = 0;
1829 for (j = 0; j < agent_ids->nkeys; j++) {
1830 if (sshkey_equal(ca, agent_ids->keys[j])) {
1831 found = 1;
1832 break;
1833 }
1834 }
1835 if (!found)
1836 fatal("CA key %s not found in agent", tmp);
1837 ssh_free_identitylist(agent_ids);
1838 ca->flags |= SSHKEY_FLAG_EXT;
1839 } else {
1840 /* CA key is assumed to be a private key on the filesystem */
1841 ca = load_identity(tmp, NULL);
1842 if (sshkey_is_sk(ca) &&
1843 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
1844 if ((pin = read_passphrase("Enter PIN for CA key: ",
1845 RP_ALLOW_STDIN)) == NULL)
1846 fatal_f("couldn't read PIN");
1847 }
1848 }
1849 free(tmp);
1850
1851 if (key_type_name != NULL) {
1852 if (sshkey_type_from_shortname(key_type_name) != ca->type) {
1853 fatal("CA key type %s doesn't match specified %s",
1854 sshkey_ssh_name(ca), key_type_name);
1855 }
1856 } else if (ca->type == KEY_RSA) {
1857 /* Default to a good signature algorithm */
1858 key_type_name = "rsa-sha2-512";
1859 }
1860 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT);
1861
1862 finalise_cert_exts();
1863 for (i = 0; i < argc; i++) {
1864 /* Split list of principals */
1865 n = 0;
1866 if (cert_principals != NULL) {
1867 otmp = tmp = xstrdup(cert_principals);
1868 plist = NULL;
1869 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1870 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1871 if (*(plist[n] = xstrdup(cp)) == '\0')
1872 fatal("Empty principal name");
1873 }
1874 free(otmp);
1875 }
1876 if (n > SSHKEY_CERT_MAX_PRINCIPALS)
1877 fatal("Too many certificate principals specified");
1878
1879 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1880 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1881 fatal_r(r, "load pubkey \"%s\"", tmp);
1882 if (sshkey_is_cert(public))
1883 fatal_f("key \"%s\" type %s cannot be certified",
1884 tmp, sshkey_type(public));
1885
1886 /* Prepare certificate to sign */
1887 if ((r = sshkey_to_certified(public)) != 0)
1888 fatal_r(r, "Could not upgrade key %s to certificate", tmp);
1889 public->cert->type = cert_key_type;
1890 public->cert->serial = (u_int64_t)cert_serial;
1891 public->cert->key_id = xstrdup(cert_key_id);
1892 public->cert->nprincipals = n;
1893 public->cert->principals = plist;
1894 public->cert->valid_after = cert_valid_from;
1895 public->cert->valid_before = cert_valid_to;
1896 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1897 prepare_options_buf(public->cert->extensions,
1898 OPTIONS_EXTENSIONS);
1899 if ((r = sshkey_from_private(ca,
1900 &public->cert->signature_key)) != 0)
1901 fatal_r(r, "sshkey_from_private (ca key)");
1902
1903 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1904 if ((r = sshkey_certify_custom(public, ca,
1905 key_type_name, sk_provider, NULL, agent_signer,
1906 &agent_fd)) != 0)
1907 fatal_r(r, "Couldn't certify %s via agent", tmp);
1908 } else {
1909 if (sshkey_is_sk(ca) &&
1910 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
1911 notifier = notify_start(0,
1912 "Confirm user presence for key %s %s",
1913 sshkey_type(ca), ca_fp);
1914 }
1915 r = sshkey_certify(public, ca, key_type_name,
1916 sk_provider, pin);
1917 notify_complete(notifier, "User presence confirmed");
1918 if (r != 0)
1919 fatal_r(r, "Couldn't certify key %s", tmp);
1920 }
1921
1922 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1923 *cp = '\0';
1924 xasprintf(&out, "%s-cert.pub", tmp);
1925 free(tmp);
1926
1927 if ((r = sshkey_save_public(public, out, comment)) != 0) {
1928 fatal_r(r, "Unable to save public key to %s",
1929 identity_file);
1930 }
1931
1932 if (!quiet) {
1933 sshkey_format_cert_validity(public->cert,
1934 valid, sizeof(valid));
1935 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1936 "valid %s", sshkey_cert_type(public),
1937 out, public->cert->key_id,
1938 (unsigned long long)public->cert->serial,
1939 cert_principals != NULL ? " for " : "",
1940 cert_principals != NULL ? cert_principals : "",
1941 valid);
1942 }
1943
1944 sshkey_free(public);
1945 free(out);
1946 if (cert_serial_autoinc)
1947 cert_serial++;
1948 }
1949 if (pin != NULL)
1950 freezero(pin, strlen(pin));
1951 free(ca_fp);
1952 #ifdef ENABLE_PKCS11
1953 pkcs11_terminate();
1954 #endif
1955 exit(0);
1956 }
1957
1958 static u_int64_t
1959 parse_relative_time(const char *s, time_t now)
1960 {
1961 int64_t mul, secs;
1962
1963 mul = *s == '-' ? -1 : 1;
1964
1965 if ((secs = convtime(s + 1)) == -1)
1966 fatal("Invalid relative certificate time %s", s);
1967 if (mul == -1 && secs > now)
1968 fatal("Certificate time %s cannot be represented", s);
1969 return now + (u_int64_t)(secs * mul);
1970 }
1971
1972 static void
1973 parse_hex_u64(const char *s, uint64_t *up)
1974 {
1975 char *ep;
1976 unsigned long long ull;
1977
1978 errno = 0;
1979 ull = strtoull(s, &ep, 16);
1980 if (*s == '\0' || *ep != '\0')
1981 fatal("Invalid certificate time: not a number");
1982 if (errno == ERANGE && ull == ULONG_MAX)
1983 fatal_fr(SSH_ERR_SYSTEM_ERROR, "Invalid certificate time");
1984 *up = (uint64_t)ull;
1985 }
1986
1987 static void
1988 parse_cert_times(char *timespec)
1989 {
1990 char *from, *to;
1991 time_t now = time(NULL);
1992 int64_t secs;
1993
1994 /* +timespec relative to now */
1995 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1996 if ((secs = convtime(timespec + 1)) == -1)
1997 fatal("Invalid relative certificate life %s", timespec);
1998 cert_valid_to = now + secs;
1999 /*
2000 * Backdate certificate one minute to avoid problems on hosts
2001 * with poorly-synchronised clocks.
2002 */
2003 cert_valid_from = ((now - 59)/ 60) * 60;
2004 return;
2005 }
2006
2007 /*
2008 * from:to, where
2009 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "always"
2010 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "forever"
2011 */
2012 from = xstrdup(timespec);
2013 to = strchr(from, ':');
2014 if (to == NULL || from == to || *(to + 1) == '\0')
2015 fatal("Invalid certificate life specification %s", timespec);
2016 *to++ = '\0';
2017
2018 if (*from == '-' || *from == '+')
2019 cert_valid_from = parse_relative_time(from, now);
2020 else if (strcmp(from, "always") == 0)
2021 cert_valid_from = 0;
2022 else if (strncmp(from, "0x", 2) == 0)
2023 parse_hex_u64(from, &cert_valid_from);
2024 else if (parse_absolute_time(from, &cert_valid_from) != 0)
2025 fatal("Invalid from time \"%s\"", from);
2026
2027 if (*to == '-' || *to == '+')
2028 cert_valid_to = parse_relative_time(to, now);
2029 else if (strcmp(to, "forever") == 0)
2030 cert_valid_to = ~(u_int64_t)0;
2031 else if (strncmp(to, "0x", 2) == 0)
2032 parse_hex_u64(to, &cert_valid_to);
2033 else if (parse_absolute_time(to, &cert_valid_to) != 0)
2034 fatal("Invalid to time \"%s\"", to);
2035
2036 if (cert_valid_to <= cert_valid_from)
2037 fatal("Empty certificate validity interval");
2038 free(from);
2039 }
2040
2041 static void
2042 add_cert_option(char *opt)
2043 {
2044 char *val, *cp;
2045 int iscrit = 0;
2046
2047 if (strcasecmp(opt, "clear") == 0)
2048 certflags_flags = 0;
2049 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
2050 certflags_flags &= ~CERTOPT_X_FWD;
2051 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
2052 certflags_flags |= CERTOPT_X_FWD;
2053 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
2054 certflags_flags &= ~CERTOPT_AGENT_FWD;
2055 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
2056 certflags_flags |= CERTOPT_AGENT_FWD;
2057 else if (strcasecmp(opt, "no-port-forwarding") == 0)
2058 certflags_flags &= ~CERTOPT_PORT_FWD;
2059 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
2060 certflags_flags |= CERTOPT_PORT_FWD;
2061 else if (strcasecmp(opt, "no-pty") == 0)
2062 certflags_flags &= ~CERTOPT_PTY;
2063 else if (strcasecmp(opt, "permit-pty") == 0)
2064 certflags_flags |= CERTOPT_PTY;
2065 else if (strcasecmp(opt, "no-user-rc") == 0)
2066 certflags_flags &= ~CERTOPT_USER_RC;
2067 else if (strcasecmp(opt, "permit-user-rc") == 0)
2068 certflags_flags |= CERTOPT_USER_RC;
2069 else if (strcasecmp(opt, "touch-required") == 0)
2070 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE;
2071 else if (strcasecmp(opt, "no-touch-required") == 0)
2072 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE;
2073 else if (strcasecmp(opt, "no-verify-required") == 0)
2074 certflags_flags &= ~CERTOPT_REQUIRE_VERIFY;
2075 else if (strcasecmp(opt, "verify-required") == 0)
2076 certflags_flags |= CERTOPT_REQUIRE_VERIFY;
2077 else if (strncasecmp(opt, "force-command=", 14) == 0) {
2078 val = opt + 14;
2079 if (*val == '\0')
2080 fatal("Empty force-command option");
2081 if (certflags_command != NULL)
2082 fatal("force-command already specified");
2083 certflags_command = xstrdup(val);
2084 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
2085 val = opt + 15;
2086 if (*val == '\0')
2087 fatal("Empty source-address option");
2088 if (certflags_src_addr != NULL)
2089 fatal("source-address already specified");
2090 if (addr_match_cidr_list(NULL, val) != 0)
2091 fatal("Invalid source-address list");
2092 certflags_src_addr = xstrdup(val);
2093 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
2094 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
2095 val = xstrdup(strchr(opt, ':') + 1);
2096 if ((cp = strchr(val, '=')) != NULL)
2097 *cp++ = '\0';
2098 cert_ext_add(val, cp, iscrit);
2099 free(val);
2100 } else
2101 fatal("Unsupported certificate option \"%s\"", opt);
2102 }
2103
2104 static void
2105 show_options(struct sshbuf *optbuf, int in_critical)
2106 {
2107 char *name, *arg, *hex;
2108 struct sshbuf *options, *option = NULL;
2109 int r;
2110
2111 if ((options = sshbuf_fromb(optbuf)) == NULL)
2112 fatal_f("sshbuf_fromb failed");
2113 while (sshbuf_len(options) != 0) {
2114 sshbuf_free(option);
2115 option = NULL;
2116 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
2117 (r = sshbuf_froms(options, &option)) != 0)
2118 fatal_fr(r, "parse option");
2119 printf(" %s", name);
2120 if (!in_critical &&
2121 (strcmp(name, "permit-X11-forwarding") == 0 ||
2122 strcmp(name, "permit-agent-forwarding") == 0 ||
2123 strcmp(name, "permit-port-forwarding") == 0 ||
2124 strcmp(name, "permit-pty") == 0 ||
2125 strcmp(name, "permit-user-rc") == 0 ||
2126 strcmp(name, "no-touch-required") == 0)) {
2127 printf("\n");
2128 } else if (in_critical &&
2129 (strcmp(name, "force-command") == 0 ||
2130 strcmp(name, "source-address") == 0)) {
2131 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
2132 fatal_fr(r, "parse critical");
2133 printf(" %s\n", arg);
2134 free(arg);
2135 } else if (in_critical &&
2136 strcmp(name, "verify-required") == 0) {
2137 printf("\n");
2138 } else if (sshbuf_len(option) > 0) {
2139 hex = sshbuf_dtob16(option);
2140 printf(" UNKNOWN OPTION: %s (len %zu)\n",
2141 hex, sshbuf_len(option));
2142 sshbuf_reset(option);
2143 free(hex);
2144 } else
2145 printf(" UNKNOWN FLAG OPTION\n");
2146 free(name);
2147 if (sshbuf_len(option) != 0)
2148 fatal("Option corrupt: extra data at end");
2149 }
2150 sshbuf_free(option);
2151 sshbuf_free(options);
2152 }
2153
2154 static void
2155 print_cert(struct sshkey *key)
2156 {
2157 char valid[64], *key_fp, *ca_fp;
2158 u_int i;
2159
2160 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2161 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2162 fingerprint_hash, SSH_FP_DEFAULT);
2163 if (key_fp == NULL || ca_fp == NULL)
2164 fatal_f("sshkey_fingerprint fail");
2165 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2166
2167 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2168 sshkey_cert_type(key));
2169 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2170 printf(" Signing CA: %s %s (using %s)\n",
2171 sshkey_type(key->cert->signature_key), ca_fp,
2172 key->cert->signature_type);
2173 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2174 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2175 printf(" Valid: %s\n", valid);
2176 printf(" Principals: ");
2177 if (key->cert->nprincipals == 0)
2178 printf("(none)\n");
2179 else {
2180 for (i = 0; i < key->cert->nprincipals; i++)
2181 printf("\n %s",
2182 key->cert->principals[i]);
2183 printf("\n");
2184 }
2185 printf(" Critical Options: ");
2186 if (sshbuf_len(key->cert->critical) == 0)
2187 printf("(none)\n");
2188 else {
2189 printf("\n");
2190 show_options(key->cert->critical, 1);
2191 }
2192 printf(" Extensions: ");
2193 if (sshbuf_len(key->cert->extensions) == 0)
2194 printf("(none)\n");
2195 else {
2196 printf("\n");
2197 show_options(key->cert->extensions, 0);
2198 }
2199 }
2200
2201 static void
2202 do_show_cert(struct passwd *pw)
2203 {
2204 struct sshkey *key = NULL;
2205 struct stat st;
2206 int r, is_stdin = 0, ok = 0;
2207 FILE *f;
2208 char *cp, *line = NULL;
2209 const char *path;
2210 size_t linesize = 0;
2211 u_long lnum = 0;
2212
2213 if (!have_identity)
2214 ask_filename(pw, "Enter file in which the key is");
2215 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1)
2216 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2217
2218 path = identity_file;
2219 if (strcmp(path, "-") == 0) {
2220 f = stdin;
2221 path = "(stdin)";
2222 is_stdin = 1;
2223 } else if ((f = fopen(identity_file, "r")) == NULL)
2224 fatal("fopen %s: %s", identity_file, strerror(errno));
2225
2226 while (getline(&line, &linesize, f) != -1) {
2227 lnum++;
2228 sshkey_free(key);
2229 key = NULL;
2230 /* Trim leading space and comments */
2231 cp = line + strspn(line, " \t");
2232 if (*cp == '#' || *cp == '\0')
2233 continue;
2234 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2235 fatal("sshkey_new");
2236 if ((r = sshkey_read(key, &cp)) != 0) {
2237 error_r(r, "%s:%lu: invalid key", path, lnum);
2238 continue;
2239 }
2240 if (!sshkey_is_cert(key)) {
2241 error("%s:%lu is not a certificate", path, lnum);
2242 continue;
2243 }
2244 ok = 1;
2245 if (!is_stdin && lnum == 1)
2246 printf("%s:\n", path);
2247 else
2248 printf("%s:%lu:\n", path, lnum);
2249 print_cert(key);
2250 }
2251 free(line);
2252 sshkey_free(key);
2253 fclose(f);
2254 exit(ok ? 0 : 1);
2255 }
2256
2257 static void
2258 load_krl(const char *path, struct ssh_krl **krlp)
2259 {
2260 struct sshbuf *krlbuf;
2261 int r;
2262
2263 if ((r = sshbuf_load_file(path, &krlbuf)) != 0)
2264 fatal_r(r, "Unable to load KRL %s", path);
2265 /* XXX check sigs */
2266 if ((r = ssh_krl_from_blob(krlbuf, krlp)) != 0 ||
2267 *krlp == NULL)
2268 fatal_r(r, "Invalid KRL file %s", path);
2269 sshbuf_free(krlbuf);
2270 }
2271
2272 static void
2273 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp,
2274 const char *file, u_long lnum)
2275 {
2276 char *tmp;
2277 size_t tlen;
2278 struct sshbuf *b;
2279 int r;
2280
2281 if (strncmp(cp, "SHA256:", 7) != 0)
2282 fatal("%s:%lu: unsupported hash algorithm", file, lnum);
2283 cp += 7;
2284
2285 /*
2286 * OpenSSH base64 hashes omit trailing '='
2287 * characters; put them back for decode.
2288 */
2289 if ((tlen = strlen(cp)) >= SIZE_MAX - 5)
2290 fatal_f("hash too long: %zu bytes", tlen);
2291 tmp = xmalloc(tlen + 4 + 1);
2292 strlcpy(tmp, cp, tlen + 1);
2293 while ((tlen % 4) != 0) {
2294 tmp[tlen++] = '=';
2295 tmp[tlen] = '\0';
2296 }
2297 if ((b = sshbuf_new()) == NULL)
2298 fatal_f("sshbuf_new failed");
2299 if ((r = sshbuf_b64tod(b, tmp)) != 0)
2300 fatal_r(r, "%s:%lu: decode hash failed", file, lnum);
2301 free(tmp);
2302 *lenp = sshbuf_len(b);
2303 *blobp = xmalloc(*lenp);
2304 memcpy(*blobp, sshbuf_ptr(b), *lenp);
2305 sshbuf_free(b);
2306 }
2307
2308 static void
2309 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2310 const struct sshkey *ca, struct ssh_krl *krl)
2311 {
2312 struct sshkey *key = NULL;
2313 u_long lnum = 0;
2314 char *path, *cp, *ep, *line = NULL;
2315 u_char *blob = NULL;
2316 size_t blen = 0, linesize = 0;
2317 unsigned long long serial, serial2;
2318 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r;
2319 FILE *krl_spec;
2320
2321 path = tilde_expand_filename(file, pw->pw_uid);
2322 if (strcmp(path, "-") == 0) {
2323 krl_spec = stdin;
2324 free(path);
2325 path = xstrdup("(standard input)");
2326 } else if ((krl_spec = fopen(path, "r")) == NULL)
2327 fatal("fopen %s: %s", path, strerror(errno));
2328
2329 if (!quiet)
2330 printf("Revoking from %s\n", path);
2331 while (getline(&line, &linesize, krl_spec) != -1) {
2332 if (linesize >= INT_MAX) {
2333 fatal_f("%s contains unparsable line, len=%zu",
2334 path, linesize);
2335 }
2336 lnum++;
2337 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0;
2338 cp = line + strspn(line, " \t");
2339 /* Trim trailing space, comments and strip \n */
2340 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2341 if (cp[i] == '#' || cp[i] == '\n') {
2342 cp[i] = '\0';
2343 break;
2344 }
2345 if (cp[i] == ' ' || cp[i] == '\t') {
2346 /* Remember the start of a span of whitespace */
2347 if (r == -1)
2348 r = i;
2349 } else
2350 r = -1;
2351 }
2352 if (r != -1)
2353 cp[r] = '\0';
2354 if (*cp == '\0')
2355 continue;
2356 if (strncasecmp(cp, "serial:", 7) == 0) {
2357 if (ca == NULL && !wild_ca) {
2358 fatal("revoking certificates by serial number "
2359 "requires specification of a CA key");
2360 }
2361 cp += 7;
2362 cp = cp + strspn(cp, " \t");
2363 errno = 0;
2364 serial = strtoull(cp, &ep, 0);
2365 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2366 fatal("%s:%lu: invalid serial \"%s\"",
2367 path, lnum, cp);
2368 if (errno == ERANGE && serial == ULLONG_MAX)
2369 fatal("%s:%lu: serial out of range",
2370 path, lnum);
2371 serial2 = serial;
2372 if (*ep == '-') {
2373 cp = ep + 1;
2374 errno = 0;
2375 serial2 = strtoull(cp, &ep, 0);
2376 if (*cp == '\0' || *ep != '\0')
2377 fatal("%s:%lu: invalid serial \"%s\"",
2378 path, lnum, cp);
2379 if (errno == ERANGE && serial2 == ULLONG_MAX)
2380 fatal("%s:%lu: serial out of range",
2381 path, lnum);
2382 if (serial2 <= serial)
2383 fatal("%s:%lu: invalid serial range "
2384 "%llu:%llu", path, lnum,
2385 (unsigned long long)serial,
2386 (unsigned long long)serial2);
2387 }
2388 if (ssh_krl_revoke_cert_by_serial_range(krl,
2389 ca, serial, serial2) != 0) {
2390 fatal_f("revoke serial failed");
2391 }
2392 } else if (strncasecmp(cp, "id:", 3) == 0) {
2393 if (ca == NULL && !wild_ca) {
2394 fatal("revoking certificates by key ID "
2395 "requires specification of a CA key");
2396 }
2397 cp += 3;
2398 cp = cp + strspn(cp, " \t");
2399 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2400 fatal_f("revoke key ID failed");
2401 } else if (strncasecmp(cp, "hash:", 5) == 0) {
2402 cp += 5;
2403 cp = cp + strspn(cp, " \t");
2404 hash_to_blob(cp, &blob, &blen, file, lnum);
2405 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2406 if (r != 0)
2407 fatal_fr(r, "revoke key failed");
2408 } else {
2409 if (strncasecmp(cp, "key:", 4) == 0) {
2410 cp += 4;
2411 cp = cp + strspn(cp, " \t");
2412 was_explicit_key = 1;
2413 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2414 cp += 5;
2415 cp = cp + strspn(cp, " \t");
2416 was_sha1 = 1;
2417 } else if (strncasecmp(cp, "sha256:", 7) == 0) {
2418 cp += 7;
2419 cp = cp + strspn(cp, " \t");
2420 was_sha256 = 1;
2421 /*
2422 * Just try to process the line as a key.
2423 * Parsing will fail if it isn't.
2424 */
2425 }
2426 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2427 fatal("sshkey_new");
2428 if ((r = sshkey_read(key, &cp)) != 0)
2429 fatal_r(r, "%s:%lu: invalid key", path, lnum);
2430 if (was_explicit_key)
2431 r = ssh_krl_revoke_key_explicit(krl, key);
2432 else if (was_sha1) {
2433 if (sshkey_fingerprint_raw(key,
2434 SSH_DIGEST_SHA1, &blob, &blen) != 0) {
2435 fatal("%s:%lu: fingerprint failed",
2436 file, lnum);
2437 }
2438 r = ssh_krl_revoke_key_sha1(krl, blob, blen);
2439 } else if (was_sha256) {
2440 if (sshkey_fingerprint_raw(key,
2441 SSH_DIGEST_SHA256, &blob, &blen) != 0) {
2442 fatal("%s:%lu: fingerprint failed",
2443 file, lnum);
2444 }
2445 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2446 } else
2447 r = ssh_krl_revoke_key(krl, key);
2448 if (r != 0)
2449 fatal_fr(r, "revoke key failed");
2450 freezero(blob, blen);
2451 blob = NULL;
2452 blen = 0;
2453 sshkey_free(key);
2454 }
2455 }
2456 if (strcmp(path, "-") != 0)
2457 fclose(krl_spec);
2458 free(line);
2459 free(path);
2460 }
2461
2462 static void
2463 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path,
2464 unsigned long long krl_version, const char *krl_comment,
2465 int argc, char **argv)
2466 {
2467 struct ssh_krl *krl;
2468 struct stat sb;
2469 struct sshkey *ca = NULL;
2470 int i, r, wild_ca = 0;
2471 char *tmp;
2472 struct sshbuf *kbuf;
2473
2474 if (*identity_file == '\0')
2475 fatal("KRL generation requires an output file");
2476 if (stat(identity_file, &sb) == -1) {
2477 if (errno != ENOENT)
2478 fatal("Cannot access KRL \"%s\": %s",
2479 identity_file, strerror(errno));
2480 if (updating)
2481 fatal("KRL \"%s\" does not exist", identity_file);
2482 }
2483 if (ca_key_path != NULL) {
2484 if (strcasecmp(ca_key_path, "none") == 0)
2485 wild_ca = 1;
2486 else {
2487 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2488 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2489 fatal_r(r, "Cannot load CA public key %s", tmp);
2490 free(tmp);
2491 }
2492 }
2493
2494 if (updating)
2495 load_krl(identity_file, &krl);
2496 else if ((krl = ssh_krl_init()) == NULL)
2497 fatal("couldn't create KRL");
2498
2499 if (krl_version != 0)
2500 ssh_krl_set_version(krl, krl_version);
2501 if (krl_comment != NULL)
2502 ssh_krl_set_comment(krl, krl_comment);
2503
2504 for (i = 0; i < argc; i++)
2505 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2506
2507 if ((kbuf = sshbuf_new()) == NULL)
2508 fatal("sshbuf_new failed");
2509 if (ssh_krl_to_blob(krl, kbuf) != 0)
2510 fatal("Couldn't generate KRL");
2511 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0)
2512 fatal("write %s: %s", identity_file, strerror(errno));
2513 sshbuf_free(kbuf);
2514 ssh_krl_free(krl);
2515 sshkey_free(ca);
2516 }
2517
2518 static void
2519 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv)
2520 {
2521 int i, r, ret = 0;
2522 char *comment;
2523 struct ssh_krl *krl;
2524 struct sshkey *k;
2525
2526 if (*identity_file == '\0')
2527 fatal("KRL checking requires an input file");
2528 load_krl(identity_file, &krl);
2529 if (print_krl)
2530 krl_dump(krl, stdout);
2531 for (i = 0; i < argc; i++) {
2532 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2533 fatal_r(r, "Cannot load public key %s", argv[i]);
2534 r = ssh_krl_check_key(krl, k);
2535 printf("%s%s%s%s: %s\n", argv[i],
2536 *comment ? " (" : "", comment, *comment ? ")" : "",
2537 r == 0 ? "ok" : "REVOKED");
2538 if (r != 0)
2539 ret = 1;
2540 sshkey_free(k);
2541 free(comment);
2542 }
2543 ssh_krl_free(krl);
2544 exit(ret);
2545 }
2546
2547 static struct sshkey *
2548 load_sign_key(const char *keypath, const struct sshkey *pubkey)
2549 {
2550 size_t i, slen, plen = strlen(keypath);
2551 char *privpath = xstrdup(keypath);
2552 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL };
2553 struct sshkey *ret = NULL, *privkey = NULL;
2554 int r, waspub = 0;
2555 struct stat st;
2556
2557 /*
2558 * If passed a public key filename, then try to locate the corresponding
2559 * private key. This lets us specify certificates on the command-line
2560 * and have ssh-keygen find the appropriate private key.
2561 */
2562 for (i = 0; suffixes[i]; i++) {
2563 slen = strlen(suffixes[i]);
2564 if (plen <= slen ||
2565 strcmp(privpath + plen - slen, suffixes[i]) != 0)
2566 continue;
2567 privpath[plen - slen] = '\0';
2568 debug_f("%s looks like a public key, using private key "
2569 "path %s instead", keypath, privpath);
2570 waspub = 1;
2571 }
2572 if (waspub && stat(privpath, &st) != 0 && errno == ENOENT)
2573 fatal("No private key found for public key \"%s\"", keypath);
2574 if ((r = sshkey_load_private(privpath, "", &privkey, NULL)) != 0 &&
2575 (r != SSH_ERR_KEY_WRONG_PASSPHRASE)) {
2576 debug_fr(r, "load private key \"%s\"", privpath);
2577 fatal("No private key found for \"%s\"", privpath);
2578 } else if (privkey == NULL)
2579 privkey = load_identity(privpath, NULL);
2580
2581 if (!sshkey_equal_public(pubkey, privkey)) {
2582 error("Public key %s doesn't match private %s",
2583 keypath, privpath);
2584 goto done;
2585 }
2586 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) {
2587 /*
2588 * Graft the certificate onto the private key to make
2589 * it capable of signing.
2590 */
2591 if ((r = sshkey_to_certified(privkey)) != 0) {
2592 error_fr(r, "sshkey_to_certified");
2593 goto done;
2594 }
2595 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) {
2596 error_fr(r, "sshkey_cert_copy");
2597 goto done;
2598 }
2599 }
2600 /* success */
2601 ret = privkey;
2602 privkey = NULL;
2603 done:
2604 sshkey_free(privkey);
2605 free(privpath);
2606 return ret;
2607 }
2608
2609 static int
2610 sign_one(struct sshkey *signkey, const char *filename, int fd,
2611 const char *sig_namespace, const char *hashalg, sshsig_signer *signer,
2612 void *signer_ctx)
2613 {
2614 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2615 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno;
2616 char *wfile = NULL, *asig = NULL, *fp = NULL;
2617 char *pin = NULL, *prompt = NULL;
2618
2619 if (!quiet) {
2620 if (fd == STDIN_FILENO)
2621 fprintf(stderr, "Signing data on standard input\n");
2622 else
2623 fprintf(stderr, "Signing file %s\n", filename);
2624 }
2625 if (signer == NULL && sshkey_is_sk(signkey)) {
2626 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
2627 xasprintf(&prompt, "Enter PIN for %s key: ",
2628 sshkey_type(signkey));
2629 if ((pin = read_passphrase(prompt,
2630 RP_ALLOW_STDIN)) == NULL)
2631 fatal_f("couldn't read PIN");
2632 }
2633 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
2634 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash,
2635 SSH_FP_DEFAULT)) == NULL)
2636 fatal_f("fingerprint failed");
2637 fprintf(stderr, "Confirm user presence for key %s %s\n",
2638 sshkey_type(signkey), fp);
2639 free(fp);
2640 }
2641 }
2642 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin,
2643 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) {
2644 error_r(r, "Signing %s failed", filename);
2645 goto out;
2646 }
2647 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) {
2648 error_fr(r, "sshsig_armor");
2649 goto out;
2650 }
2651 if ((asig = sshbuf_dup_string(abuf)) == NULL) {
2652 error_f("buffer error");
2653 r = SSH_ERR_ALLOC_FAIL;
2654 goto out;
2655 }
2656
2657 if (fd == STDIN_FILENO) {
2658 fputs(asig, stdout);
2659 fflush(stdout);
2660 } else {
2661 xasprintf(&wfile, "%s.sig", filename);
2662 if (confirm_overwrite(wfile)) {
2663 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC,
2664 0666)) == -1) {
2665 oerrno = errno;
2666 error("Cannot open %s: %s",
2667 wfile, strerror(errno));
2668 errno = oerrno;
2669 r = SSH_ERR_SYSTEM_ERROR;
2670 goto out;
2671 }
2672 if (atomicio(vwrite, wfd, asig,
2673 strlen(asig)) != strlen(asig)) {
2674 oerrno = errno;
2675 error("Cannot write to %s: %s",
2676 wfile, strerror(errno));
2677 errno = oerrno;
2678 r = SSH_ERR_SYSTEM_ERROR;
2679 goto out;
2680 }
2681 if (!quiet) {
2682 fprintf(stderr, "Write signature to %s\n",
2683 wfile);
2684 }
2685 }
2686 }
2687 /* success */
2688 r = 0;
2689 out:
2690 free(wfile);
2691 free(prompt);
2692 free(asig);
2693 if (pin != NULL)
2694 freezero(pin, strlen(pin));
2695 sshbuf_free(abuf);
2696 sshbuf_free(sigbuf);
2697 if (wfd != -1)
2698 close(wfd);
2699 return r;
2700 }
2701
2702 static int
2703 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp,
2704 uint64_t *verify_timep, int *print_pubkey)
2705 {
2706 size_t i;
2707 time_t now;
2708
2709 if (verify_timep != NULL)
2710 *verify_timep = 0;
2711 if (print_pubkey != NULL)
2712 *print_pubkey = 0;
2713 if (hashalgp != NULL)
2714 *hashalgp = NULL;
2715 for (i = 0; i < nopts; i++) {
2716 if (hashalgp != NULL &&
2717 strncasecmp(opts[i], "hashalg=", 8) == 0) {
2718 *hashalgp = xstrdup(opts[i] + 8);
2719 } else if (verify_timep &&
2720 strncasecmp(opts[i], "verify-time=", 12) == 0) {
2721 if (parse_absolute_time(opts[i] + 12,
2722 verify_timep) != 0 || *verify_timep == 0) {
2723 error("Invalid \"verify-time\" option");
2724 return SSH_ERR_INVALID_ARGUMENT;
2725 }
2726 } else if (print_pubkey &&
2727 strcasecmp(opts[i], "print-pubkey") == 0) {
2728 *print_pubkey = 1;
2729 } else {
2730 error("Invalid option \"%s\"", opts[i]);
2731 return SSH_ERR_INVALID_ARGUMENT;
2732 }
2733 }
2734 if (verify_timep && *verify_timep == 0) {
2735 if ((now = time(NULL)) < 0) {
2736 error("Time is before epoch");
2737 return SSH_ERR_INVALID_ARGUMENT;
2738 }
2739 *verify_timep = (uint64_t)now;
2740 }
2741 return 0;
2742 }
2743
2744
2745 static int
2746 sig_sign(const char *keypath, const char *sig_namespace, int require_agent,
2747 int argc, char **argv, char * const *opts, size_t nopts)
2748 {
2749 int i, fd = -1, r, ret = -1;
2750 int agent_fd = -1;
2751 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL;
2752 sshsig_signer *signer = NULL;
2753 char *hashalg = NULL;
2754
2755 /* Check file arguments. */
2756 for (i = 0; i < argc; i++) {
2757 if (strcmp(argv[i], "-") != 0)
2758 continue;
2759 if (i > 0 || argc > 1)
2760 fatal("Cannot sign mix of paths and standard input");
2761 }
2762
2763 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0)
2764 goto done; /* error already logged */
2765
2766 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) {
2767 error_r(r, "Couldn't load public key %s", keypath);
2768 goto done;
2769 }
2770
2771 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
2772 if (require_agent)
2773 fatal("Couldn't get agent socket");
2774 debug_r(r, "Couldn't get agent socket");
2775 } else {
2776 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0)
2777 signer = agent_signer;
2778 else {
2779 if (require_agent)
2780 fatal("Couldn't find key in agent");
2781 debug_r(r, "Couldn't find key in agent");
2782 }
2783 }
2784
2785 if (signer == NULL) {
2786 /* Not using agent - try to load private key */
2787 if ((privkey = load_sign_key(keypath, pubkey)) == NULL)
2788 goto done;
2789 signkey = privkey;
2790 } else {
2791 /* Will use key in agent */
2792 signkey = pubkey;
2793 }
2794
2795 if (argc == 0) {
2796 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO,
2797 sig_namespace, hashalg, signer, &agent_fd)) != 0)
2798 goto done;
2799 } else {
2800 for (i = 0; i < argc; i++) {
2801 if (strcmp(argv[i], "-") == 0)
2802 fd = STDIN_FILENO;
2803 else if ((fd = open(argv[i], O_RDONLY)) == -1) {
2804 error("Cannot open %s for signing: %s",
2805 argv[i], strerror(errno));
2806 goto done;
2807 }
2808 if ((r = sign_one(signkey, argv[i], fd, sig_namespace,
2809 hashalg, signer, &agent_fd)) != 0)
2810 goto done;
2811 if (fd != STDIN_FILENO)
2812 close(fd);
2813 fd = -1;
2814 }
2815 }
2816
2817 ret = 0;
2818 done:
2819 if (fd != -1 && fd != STDIN_FILENO)
2820 close(fd);
2821 sshkey_free(pubkey);
2822 sshkey_free(privkey);
2823 free(hashalg);
2824 return ret;
2825 }
2826
2827 static int
2828 sig_verify(const char *signature, const char *sig_namespace,
2829 const char *principal, const char *allowed_keys, const char *revoked_keys,
2830 char * const *opts, size_t nopts)
2831 {
2832 int r, ret = -1;
2833 int print_pubkey = 0;
2834 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2835 struct sshkey *sign_key = NULL;
2836 char *fp = NULL;
2837 struct sshkey_sig_details *sig_details = NULL;
2838 uint64_t verify_time = 0;
2839
2840 if (sig_process_opts(opts, nopts, NULL, &verify_time,
2841 &print_pubkey) != 0)
2842 goto done; /* error already logged */
2843
2844 memset(&sig_details, 0, sizeof(sig_details));
2845 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2846 error_r(r, "Couldn't read signature file");
2847 goto done;
2848 }
2849
2850 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2851 error_fr(r, "sshsig_armor");
2852 goto done;
2853 }
2854 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace,
2855 &sign_key, &sig_details)) != 0)
2856 goto done; /* sshsig_verify() prints error */
2857
2858 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2859 SSH_FP_DEFAULT)) == NULL)
2860 fatal_f("sshkey_fingerprint failed");
2861 debug("Valid (unverified) signature from key %s", fp);
2862 if (sig_details != NULL) {
2863 debug2_f("signature details: counter = %u, flags = 0x%02x",
2864 sig_details->sk_counter, sig_details->sk_flags);
2865 }
2866 free(fp);
2867 fp = NULL;
2868
2869 if (revoked_keys != NULL) {
2870 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
2871 debug3_fr(r, "sshkey_check_revoked");
2872 goto done;
2873 }
2874 }
2875
2876 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys,
2877 sign_key, principal, sig_namespace, verify_time)) != 0) {
2878 debug3_fr(r, "sshsig_check_allowed_keys");
2879 goto done;
2880 }
2881 /* success */
2882 ret = 0;
2883 done:
2884 if (!quiet) {
2885 if (ret == 0) {
2886 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2887 SSH_FP_DEFAULT)) == NULL)
2888 fatal_f("sshkey_fingerprint failed");
2889 if (principal == NULL) {
2890 printf("Good \"%s\" signature with %s key %s\n",
2891 sig_namespace, sshkey_type(sign_key), fp);
2892
2893 } else {
2894 printf("Good \"%s\" signature for %s with %s key %s\n",
2895 sig_namespace, principal,
2896 sshkey_type(sign_key), fp);
2897 }
2898 } else {
2899 printf("Could not verify signature.\n");
2900 }
2901 }
2902 /* Print the signature key if requested */
2903 if (ret == 0 && print_pubkey && sign_key != NULL) {
2904 if ((r = sshkey_write(sign_key, stdout)) == 0)
2905 fputc('\n', stdout);
2906 else {
2907 error_r(r, "Could not print public key.\n");
2908 ret = -1;
2909 }
2910 }
2911 sshbuf_free(sigbuf);
2912 sshbuf_free(abuf);
2913 sshkey_free(sign_key);
2914 sshkey_sig_details_free(sig_details);
2915 free(fp);
2916 return ret;
2917 }
2918
2919 static int
2920 sig_find_principals(const char *signature, const char *allowed_keys,
2921 char * const *opts, size_t nopts)
2922 {
2923 int r, ret = -1;
2924 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2925 struct sshkey *sign_key = NULL;
2926 char *principals = NULL, *cp, *tmp;
2927 uint64_t verify_time = 0;
2928
2929 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0)
2930 goto done; /* error already logged */
2931
2932 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2933 error_r(r, "Couldn't read signature file");
2934 goto done;
2935 }
2936 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2937 error_fr(r, "sshsig_armor");
2938 goto done;
2939 }
2940 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) {
2941 error_fr(r, "sshsig_get_pubkey");
2942 goto done;
2943 }
2944 if ((r = sshsig_find_principals(allowed_keys, sign_key,
2945 verify_time, &principals)) != 0) {
2946 if (r != SSH_ERR_KEY_NOT_FOUND)
2947 error_fr(r, "sshsig_find_principal");
2948 goto done;
2949 }
2950 ret = 0;
2951 done:
2952 if (ret == 0 ) {
2953 /* Emit matching principals one per line */
2954 tmp = principals;
2955 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0')
2956 puts(cp);
2957 } else {
2958 fprintf(stderr, "No principal matched.\n");
2959 }
2960 sshbuf_free(sigbuf);
2961 sshbuf_free(abuf);
2962 sshkey_free(sign_key);
2963 free(principals);
2964 return ret;
2965 }
2966
2967 static int
2968 sig_match_principals(const char *allowed_keys, char *principal,
2969 char * const *opts, size_t nopts)
2970 {
2971 int r;
2972 char **principals = NULL;
2973 size_t i, nprincipals = 0;
2974
2975 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0)
2976 return r; /* error already logged */
2977
2978 if ((r = sshsig_match_principals(allowed_keys, principal,
2979 &principals, &nprincipals)) != 0) {
2980 debug_f("match: %s", ssh_err(r));
2981 fprintf(stderr, "No principal matched.\n");
2982 return r;
2983 }
2984 for (i = 0; i < nprincipals; i++) {
2985 printf("%s\n", principals[i]);
2986 free(principals[i]);
2987 }
2988 free(principals);
2989
2990 return 0;
2991 }
2992
2993 static void
2994 do_moduli_gen(const char *out_file, char **opts, size_t nopts)
2995 {
2996 #ifdef WITH_OPENSSL
2997 /* Moduli generation/screening */
2998 u_int32_t memory = 0;
2999 BIGNUM *start = NULL;
3000 int moduli_bits = 0;
3001 FILE *out;
3002 size_t i;
3003 const char *errstr;
3004
3005 /* Parse options */
3006 for (i = 0; i < nopts; i++) {
3007 if (strncmp(opts[i], "memory=", 7) == 0) {
3008 memory = (u_int32_t)strtonum(opts[i]+7, 1,
3009 UINT_MAX, &errstr);
3010 if (errstr) {
3011 fatal("Memory limit is %s: %s",
3012 errstr, opts[i]+7);
3013 }
3014 } else if (strncmp(opts[i], "start=", 6) == 0) {
3015 /* XXX - also compare length against bits */
3016 if (BN_hex2bn(&start, opts[i]+6) == 0)
3017 fatal("Invalid start point.");
3018 } else if (strncmp(opts[i], "bits=", 5) == 0) {
3019 moduli_bits = (int)strtonum(opts[i]+5, 1,
3020 INT_MAX, &errstr);
3021 if (errstr) {
3022 fatal("Invalid number: %s (%s)",
3023 opts[i]+12, errstr);
3024 }
3025 } else {
3026 fatal("Option \"%s\" is unsupported for moduli "
3027 "generation", opts[i]);
3028 }
3029 }
3030
3031 if (strcmp(out_file, "-") == 0)
3032 out = stdout;
3033 else if ((out = fopen(out_file, "w")) == NULL) {
3034 fatal("Couldn't open modulus candidate file \"%s\": %s",
3035 out_file, strerror(errno));
3036 }
3037 setvbuf(out, NULL, _IOLBF, 0);
3038
3039 if (moduli_bits == 0)
3040 moduli_bits = DEFAULT_BITS;
3041 if (gen_candidates(out, memory, moduli_bits, start) != 0)
3042 fatal("modulus candidate generation failed");
3043 #else /* WITH_OPENSSL */
3044 fatal("Moduli generation is not supported");
3045 #endif /* WITH_OPENSSL */
3046 }
3047
3048 static void
3049 do_moduli_screen(const char *out_file, char **opts, size_t nopts)
3050 {
3051 #ifdef WITH_OPENSSL
3052 /* Moduli generation/screening */
3053 char *checkpoint = NULL;
3054 u_int32_t generator_wanted = 0;
3055 unsigned long start_lineno = 0, lines_to_process = 0;
3056 int prime_tests = 0;
3057 FILE *out, *in = stdin;
3058 size_t i;
3059 const char *errstr;
3060
3061 /* Parse options */
3062 for (i = 0; i < nopts; i++) {
3063 if (strncmp(opts[i], "lines=", 6) == 0) {
3064 lines_to_process = strtoul(opts[i]+6, NULL, 10);
3065 } else if (strncmp(opts[i], "start-line=", 11) == 0) {
3066 start_lineno = strtoul(opts[i]+11, NULL, 10);
3067 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) {
3068 free(checkpoint);
3069 checkpoint = xstrdup(opts[i]+11);
3070 } else if (strncmp(opts[i], "generator=", 10) == 0) {
3071 generator_wanted = (u_int32_t)strtonum(
3072 opts[i]+10, 1, UINT_MAX, &errstr);
3073 if (errstr != NULL) {
3074 fatal("Generator invalid: %s (%s)",
3075 opts[i]+10, errstr);
3076 }
3077 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) {
3078 prime_tests = (int)strtonum(opts[i]+12, 1,
3079 INT_MAX, &errstr);
3080 if (errstr) {
3081 fatal("Invalid number: %s (%s)",
3082 opts[i]+12, errstr);
3083 }
3084 } else {
3085 fatal("Option \"%s\" is unsupported for moduli "
3086 "screening", opts[i]);
3087 }
3088 }
3089
3090 if (have_identity && strcmp(identity_file, "-") != 0) {
3091 if ((in = fopen(identity_file, "r")) == NULL) {
3092 fatal("Couldn't open modulus candidate "
3093 "file \"%s\": %s", identity_file,
3094 strerror(errno));
3095 }
3096 }
3097
3098 if (strcmp(out_file, "-") == 0)
3099 out = stdout;
3100 else if ((out = fopen(out_file, "a")) == NULL) {
3101 fatal("Couldn't open moduli file \"%s\": %s",
3102 out_file, strerror(errno));
3103 }
3104 setvbuf(out, NULL, _IOLBF, 0);
3105 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests,
3106 generator_wanted, checkpoint,
3107 start_lineno, lines_to_process) != 0)
3108 fatal("modulus screening failed");
3109 if (in != stdin)
3110 (void)fclose(in);
3111 free(checkpoint);
3112 #else /* WITH_OPENSSL */
3113 fatal("Moduli screening is not supported");
3114 #endif /* WITH_OPENSSL */
3115 }
3116
3117 /* Read and confirm a passphrase */
3118 static char *
3119 read_check_passphrase(const char *prompt1, const char *prompt2,
3120 const char *retry_prompt)
3121 {
3122 char *passphrase1, *passphrase2;
3123
3124 for (;;) {
3125 passphrase1 = read_passphrase(prompt1, RP_ALLOW_STDIN);
3126 passphrase2 = read_passphrase(prompt2, RP_ALLOW_STDIN);
3127 if (strcmp(passphrase1, passphrase2) == 0) {
3128 freezero(passphrase2, strlen(passphrase2));
3129 return passphrase1;
3130 }
3131 /* The passphrases do not match. Clear them and retry. */
3132 freezero(passphrase1, strlen(passphrase1));
3133 freezero(passphrase2, strlen(passphrase2));
3134 fputs(retry_prompt, stdout);
3135 fputc('\n', stdout);
3136 fflush(stdout);
3137 }
3138 /* NOTREACHED */
3139 return NULL;
3140 }
3141
3142 static char *
3143 private_key_passphrase(const char *path)
3144 {
3145 char *prompt, *ret;
3146
3147 if (identity_passphrase)
3148 return xstrdup(identity_passphrase);
3149 if (identity_new_passphrase)
3150 return xstrdup(identity_new_passphrase);
3151
3152 xasprintf(&prompt, "Enter passphrase for \"%s\" "
3153 "(empty for no passphrase): ", path);
3154 ret = read_check_passphrase(prompt,
3155 "Enter same passphrase again: ",
3156 "Passphrases do not match. Try again.");
3157 free(prompt);
3158 return ret;
3159 }
3160
3161 static char *
3162 sk_suffix(const char *application, const uint8_t *user, size_t userlen)
3163 {
3164 char *ret, *cp;
3165 size_t slen, i;
3166
3167 /* Trim off URL-like preamble */
3168 if (strncmp(application, "ssh://", 6) == 0)
3169 ret = xstrdup(application + 6);
3170 else if (strncmp(application, "ssh:", 4) == 0)
3171 ret = xstrdup(application + 4);
3172 else
3173 ret = xstrdup(application);
3174
3175 /* Count trailing zeros in user */
3176 for (i = 0; i < userlen; i++) {
3177 if (user[userlen - i - 1] != 0)
3178 break;
3179 }
3180 if (i >= userlen)
3181 return ret; /* user-id was default all-zeros */
3182
3183 /* Append user-id, escaping non-UTF-8 characters */
3184 slen = userlen - i;
3185 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1)
3186 fatal_f("asmprintf failed");
3187 /* Don't emit a user-id that contains path or control characters */
3188 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL ||
3189 strchr(cp, '\\') != NULL) {
3190 free(cp);
3191 cp = tohex(user, slen);
3192 }
3193 xextendf(&ret, "_", "%s", cp);
3194 free(cp);
3195 return ret;
3196 }
3197
3198 static int
3199 do_download_sk(const char *skprovider, const char *device)
3200 {
3201 struct sshsk_resident_key **srks;
3202 size_t nsrks, i;
3203 int r, ret = -1;
3204 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath;
3205 const char *ext;
3206 struct sshkey *key;
3207
3208 if (skprovider == NULL)
3209 fatal("Cannot download keys without provider");
3210
3211 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN);
3212 if (!quiet) {
3213 printf("You may need to touch your authenticator "
3214 "to authorize key download.\n");
3215 }
3216 if ((r = sshsk_load_resident(skprovider, device, pin, 0,
3217 &srks, &nsrks)) != 0) {
3218 if (pin != NULL)
3219 freezero(pin, strlen(pin));
3220 error_r(r, "Unable to load resident keys");
3221 return -1;
3222 }
3223 if (nsrks == 0)
3224 logit("No keys to download");
3225 if (pin != NULL)
3226 freezero(pin, strlen(pin));
3227
3228 for (i = 0; i < nsrks; i++) {
3229 key = srks[i]->key;
3230 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) {
3231 error("Unsupported key type %s (%d)",
3232 sshkey_type(key), key->type);
3233 continue;
3234 }
3235 if ((fp = sshkey_fingerprint(key, fingerprint_hash,
3236 SSH_FP_DEFAULT)) == NULL)
3237 fatal_f("sshkey_fingerprint failed");
3238 debug_f("key %zu: %s %s %s (flags 0x%02x)", i,
3239 sshkey_type(key), fp, key->sk_application, key->sk_flags);
3240 ext = sk_suffix(key->sk_application,
3241 srks[i]->user_id, srks[i]->user_id_len);
3242 xasprintf(&path, "id_%s_rk%s%s",
3243 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk",
3244 *ext == '\0' ? "" : "_", ext);
3245
3246 /* If the file already exists, ask the user to confirm. */
3247 if (!confirm_overwrite(path)) {
3248 free(path);
3249 break;
3250 }
3251
3252 /* Save the key with the application string as the comment */
3253 if (pass == NULL)
3254 pass = private_key_passphrase(path);
3255 if ((r = sshkey_save_private(key, path, pass,
3256 key->sk_application, private_key_format,
3257 openssh_format_cipher, rounds)) != 0) {
3258 error_r(r, "Saving key \"%s\" failed", path);
3259 free(path);
3260 break;
3261 }
3262 if (!quiet) {
3263 printf("Saved %s key%s%s to %s\n", sshkey_type(key),
3264 *ext != '\0' ? " " : "",
3265 *ext != '\0' ? key->sk_application : "",
3266 path);
3267 }
3268
3269 /* Save public key too */
3270 xasprintf(&pubpath, "%s.pub", path);
3271 free(path);
3272 if ((r = sshkey_save_public(key, pubpath,
3273 key->sk_application)) != 0) {
3274 error_r(r, "Saving public key \"%s\" failed", pubpath);
3275 free(pubpath);
3276 break;
3277 }
3278 free(pubpath);
3279 }
3280
3281 if (i >= nsrks)
3282 ret = 0; /* success */
3283 if (pass != NULL)
3284 freezero(pass, strlen(pass));
3285 sshsk_free_resident_keys(srks, nsrks);
3286 return ret;
3287 }
3288
3289 static void
3290 save_attestation(struct sshbuf *attest, const char *path)
3291 {
3292 mode_t omask;
3293 int r;
3294
3295 if (path == NULL)
3296 return; /* nothing to do */
3297 if (attest == NULL || sshbuf_len(attest) == 0)
3298 fatal("Enrollment did not return attestation data");
3299 omask = umask(077);
3300 r = sshbuf_write_file(path, attest);
3301 umask(omask);
3302 if (r != 0)
3303 fatal_r(r, "Unable to write attestation data \"%s\"", path);
3304 if (!quiet)
3305 printf("Your FIDO attestation certificate has been saved in "
3306 "%s\n", path);
3307 }
3308
3309 static int
3310 confirm_sk_overwrite(const char *application, const char *user)
3311 {
3312 char yesno[3];
3313
3314 printf("A resident key scoped to '%s' with user id '%s' already "
3315 "exists.\n", application == NULL ? "ssh:" : application,
3316 user == NULL ? "null" : user);
3317 printf("Overwrite key in token (y/n)? ");
3318 fflush(stdout);
3319 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
3320 return 0;
3321 if (yesno[0] != 'y' && yesno[0] != 'Y')
3322 return 0;
3323 return 1;
3324 }
3325
3326 static void
3327 usage(void)
3328 {
3329 fprintf(stderr,
3330 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n"
3331 " [-m format] [-N new_passphrase] [-O option]\n"
3332 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n"
3333 " [-w provider] [-Z cipher]\n"
3334 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n"
3335 " [-P old_passphrase] [-Z cipher]\n"
3336 #ifdef WITH_OPENSSL
3337 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n"
3338 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n"
3339 #endif
3340 " ssh-keygen -y [-f input_keyfile]\n"
3341 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n"
3342 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
3343 " ssh-keygen -B [-f input_keyfile]\n");
3344 #ifdef ENABLE_PKCS11
3345 fprintf(stderr,
3346 " ssh-keygen -D pkcs11\n");
3347 #endif
3348 fprintf(stderr,
3349 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n"
3350 " ssh-keygen -H [-f known_hosts_file]\n"
3351 " ssh-keygen -K [-a rounds] [-w provider]\n"
3352 " ssh-keygen -R hostname [-f known_hosts_file]\n"
3353 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n"
3354 #ifdef WITH_OPENSSL
3355 " ssh-keygen -M generate [-O option] output_file\n"
3356 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n"
3357 #endif
3358 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n"
3359 " [-n principals] [-O option] [-V validity_interval]\n"
3360 " [-z serial_number] file ...\n"
3361 " ssh-keygen -L [-f input_keyfile]\n"
3362 " ssh-keygen -A [-a rounds] [-f prefix_path]\n"
3363 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
3364 " file ...\n"
3365 " ssh-keygen -Q [-l] -f krl_file [file ...]\n"
3366 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n"
3367 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n"
3368 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n"
3369 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n"
3370 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n"
3371 " -n namespace -s signature_file [-r krl_file] [-O option]\n");
3372 exit(1);
3373 }
3374
3375 /*
3376 * Main program for key management.
3377 */
3378 int
3379 main(int argc, char **argv)
3380 {
3381 char comment[1024], *passphrase = NULL;
3382 char *rr_hostname = NULL, *ep, *fp, *ra;
3383 struct sshkey *private, *public;
3384 struct passwd *pw;
3385 int r, opt, type;
3386 int change_passphrase = 0, change_comment = 0, show_cert = 0;
3387 int find_host = 0, delete_host = 0, hash_hosts = 0;
3388 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
3389 int prefer_agent = 0, convert_to = 0, convert_from = 0;
3390 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0;
3391 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0;
3392 unsigned long long cert_serial = 0;
3393 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL;
3394 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL;
3395 char *sk_attestation_path = NULL;
3396 struct sshbuf *challenge = NULL, *attest = NULL;
3397 size_t i, nopts = 0;
3398 u_int32_t bits = 0;
3399 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD;
3400 const char *errstr;
3401 int log_level = SYSLOG_LEVEL_INFO;
3402 char *sign_op = NULL;
3403
3404 extern int optind;
3405 extern char *optarg;
3406
3407 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
3408 sanitise_stdfd();
3409
3410 __progname = ssh_get_progname(argv[0]);
3411
3412 seed_rng();
3413
3414 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
3415
3416 msetlocale();
3417
3418 /* we need this for the home * directory. */
3419 pw = getpwuid(getuid());
3420 if (!pw)
3421 fatal("No user exists for uid %lu", (u_long)getuid());
3422 pw = pwcopy(pw);
3423 if (gethostname(hostname, sizeof(hostname)) == -1)
3424 fatal("gethostname: %s", strerror(errno));
3425
3426 sk_provider = getenv("SSH_SK_PROVIDER");
3427
3428 /* Remaining characters: dGjJSTWx */
3429 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy"
3430 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:"
3431 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) {
3432 switch (opt) {
3433 case 'A':
3434 gen_all_hostkeys = 1;
3435 break;
3436 case 'b':
3437 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX,
3438 &errstr);
3439 if (errstr)
3440 fatal("Bits has bad value %s (%s)",
3441 optarg, errstr);
3442 break;
3443 case 'E':
3444 fingerprint_hash = ssh_digest_alg_by_name(optarg);
3445 if (fingerprint_hash == -1)
3446 fatal("Invalid hash algorithm \"%s\"", optarg);
3447 break;
3448 case 'F':
3449 find_host = 1;
3450 rr_hostname = optarg;
3451 break;
3452 case 'H':
3453 hash_hosts = 1;
3454 break;
3455 case 'I':
3456 cert_key_id = optarg;
3457 break;
3458 case 'R':
3459 delete_host = 1;
3460 rr_hostname = optarg;
3461 break;
3462 case 'L':
3463 show_cert = 1;
3464 break;
3465 case 'l':
3466 print_fingerprint = 1;
3467 break;
3468 case 'B':
3469 print_bubblebabble = 1;
3470 break;
3471 case 'm':
3472 if (strcasecmp(optarg, "RFC4716") == 0 ||
3473 strcasecmp(optarg, "ssh2") == 0) {
3474 convert_format = FMT_RFC4716;
3475 break;
3476 }
3477 if (strcasecmp(optarg, "PKCS8") == 0) {
3478 convert_format = FMT_PKCS8;
3479 private_key_format = SSHKEY_PRIVATE_PKCS8;
3480 break;
3481 }
3482 if (strcasecmp(optarg, "PEM") == 0) {
3483 convert_format = FMT_PEM;
3484 private_key_format = SSHKEY_PRIVATE_PEM;
3485 break;
3486 }
3487 fatal("Unsupported conversion format \"%s\"", optarg);
3488 case 'n':
3489 cert_principals = optarg;
3490 break;
3491 case 'o':
3492 /* no-op; new format is already the default */
3493 break;
3494 case 'p':
3495 change_passphrase = 1;
3496 break;
3497 case 'c':
3498 change_comment = 1;
3499 break;
3500 case 'f':
3501 if (strlcpy(identity_file, optarg,
3502 sizeof(identity_file)) >= sizeof(identity_file))
3503 fatal("Identity filename too long");
3504 have_identity = 1;
3505 break;
3506 case 'g':
3507 print_generic = 1;
3508 break;
3509 case 'K':
3510 download_sk = 1;
3511 break;
3512 case 'P':
3513 identity_passphrase = optarg;
3514 break;
3515 case 'N':
3516 identity_new_passphrase = optarg;
3517 break;
3518 case 'Q':
3519 check_krl = 1;
3520 break;
3521 case 'O':
3522 opts = xrecallocarray(opts, nopts, nopts + 1,
3523 sizeof(*opts));
3524 opts[nopts++] = xstrdup(optarg);
3525 break;
3526 case 'Z':
3527 openssh_format_cipher = optarg;
3528 if (cipher_by_name(openssh_format_cipher) == NULL)
3529 fatal("Invalid OpenSSH-format cipher '%s'",
3530 openssh_format_cipher);
3531 break;
3532 case 'C':
3533 identity_comment = optarg;
3534 break;
3535 case 'q':
3536 quiet = 1;
3537 break;
3538 case 'e':
3539 /* export key */
3540 convert_to = 1;
3541 break;
3542 case 'h':
3543 cert_key_type = SSH2_CERT_TYPE_HOST;
3544 certflags_flags = 0;
3545 break;
3546 case 'k':
3547 gen_krl = 1;
3548 break;
3549 case 'i':
3550 case 'X':
3551 /* import key */
3552 convert_from = 1;
3553 break;
3554 case 'y':
3555 print_public = 1;
3556 break;
3557 case 's':
3558 ca_key_path = optarg;
3559 break;
3560 case 't':
3561 key_type_name = optarg;
3562 break;
3563 case 'D':
3564 pkcs11provider = optarg;
3565 break;
3566 case 'U':
3567 prefer_agent = 1;
3568 break;
3569 case 'u':
3570 update_krl = 1;
3571 break;
3572 case 'v':
3573 if (log_level == SYSLOG_LEVEL_INFO)
3574 log_level = SYSLOG_LEVEL_DEBUG1;
3575 else {
3576 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
3577 log_level < SYSLOG_LEVEL_DEBUG3)
3578 log_level++;
3579 }
3580 break;
3581 case 'r':
3582 rr_hostname = optarg;
3583 break;
3584 case 'a':
3585 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
3586 if (errstr)
3587 fatal("Invalid number: %s (%s)",
3588 optarg, errstr);
3589 break;
3590 case 'V':
3591 parse_cert_times(optarg);
3592 break;
3593 case 'Y':
3594 sign_op = optarg;
3595 break;
3596 case 'w':
3597 sk_provider = optarg;
3598 break;
3599 case 'z':
3600 errno = 0;
3601 if (*optarg == '+') {
3602 cert_serial_autoinc = 1;
3603 optarg++;
3604 }
3605 cert_serial = strtoull(optarg, &ep, 10);
3606 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
3607 (errno == ERANGE && cert_serial == ULLONG_MAX))
3608 fatal("Invalid serial number \"%s\"", optarg);
3609 break;
3610 case 'M':
3611 if (strcmp(optarg, "generate") == 0)
3612 do_gen_candidates = 1;
3613 else if (strcmp(optarg, "screen") == 0)
3614 do_screen_candidates = 1;
3615 else
3616 fatal("Unsupported moduli option %s", optarg);
3617 break;
3618 default:
3619 usage();
3620 }
3621 }
3622
3623 #ifdef ENABLE_SK_INTERNAL
3624 if (sk_provider == NULL)
3625 sk_provider = "internal";
3626 #endif
3627
3628 /* reinit */
3629 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
3630
3631 argv += optind;
3632 argc -= optind;
3633
3634 if (sign_op != NULL) {
3635 if (strncmp(sign_op, "find-principals", 15) == 0) {
3636 if (ca_key_path == NULL) {
3637 error("Too few arguments for find-principals:"
3638 "missing signature file");
3639 exit(1);
3640 }
3641 if (!have_identity) {
3642 error("Too few arguments for find-principals:"
3643 "missing allowed keys file");
3644 exit(1);
3645 }
3646 return sig_find_principals(ca_key_path, identity_file,
3647 opts, nopts);
3648 } else if (strncmp(sign_op, "match-principals", 16) == 0) {
3649 if (!have_identity) {
3650 error("Too few arguments for match-principals:"
3651 "missing allowed keys file");
3652 exit(1);
3653 }
3654 if (cert_key_id == NULL) {
3655 error("Too few arguments for match-principals: "
3656 "missing principal ID");
3657 exit(1);
3658 }
3659 return sig_match_principals(identity_file, cert_key_id,
3660 opts, nopts);
3661 } else if (strncmp(sign_op, "sign", 4) == 0) {
3662 /* NB. cert_principals is actually namespace, via -n */
3663 if (cert_principals == NULL ||
3664 *cert_principals == '\0') {
3665 error("Too few arguments for sign: "
3666 "missing namespace");
3667 exit(1);
3668 }
3669 if (!have_identity) {
3670 error("Too few arguments for sign: "
3671 "missing key");
3672 exit(1);
3673 }
3674 return sig_sign(identity_file, cert_principals,
3675 prefer_agent, argc, argv, opts, nopts);
3676 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) {
3677 /* NB. cert_principals is actually namespace, via -n */
3678 if (cert_principals == NULL ||
3679 *cert_principals == '\0') {
3680 error("Too few arguments for check-novalidate: "
3681 "missing namespace");
3682 exit(1);
3683 }
3684 if (ca_key_path == NULL) {
3685 error("Too few arguments for check-novalidate: "
3686 "missing signature file");
3687 exit(1);
3688 }
3689 return sig_verify(ca_key_path, cert_principals,
3690 NULL, NULL, NULL, opts, nopts);
3691 } else if (strncmp(sign_op, "verify", 6) == 0) {
3692 /* NB. cert_principals is actually namespace, via -n */
3693 if (cert_principals == NULL ||
3694 *cert_principals == '\0') {
3695 error("Too few arguments for verify: "
3696 "missing namespace");
3697 exit(1);
3698 }
3699 if (ca_key_path == NULL) {
3700 error("Too few arguments for verify: "
3701 "missing signature file");
3702 exit(1);
3703 }
3704 if (!have_identity) {
3705 error("Too few arguments for sign: "
3706 "missing allowed keys file");
3707 exit(1);
3708 }
3709 if (cert_key_id == NULL) {
3710 error("Too few arguments for verify: "
3711 "missing principal identity");
3712 exit(1);
3713 }
3714 return sig_verify(ca_key_path, cert_principals,
3715 cert_key_id, identity_file, rr_hostname,
3716 opts, nopts);
3717 }
3718 error("Unsupported operation for -Y: \"%s\"", sign_op);
3719 usage();
3720 /* NOTREACHED */
3721 }
3722
3723 if (ca_key_path != NULL) {
3724 if (argc < 1 && !gen_krl) {
3725 error("Too few arguments.");
3726 usage();
3727 }
3728 } else if (argc > 0 && !gen_krl && !check_krl &&
3729 !do_gen_candidates && !do_screen_candidates) {
3730 error("Too many arguments.");
3731 usage();
3732 }
3733 if (change_passphrase && change_comment) {
3734 error("Can only have one of -p and -c.");
3735 usage();
3736 }
3737 if (print_fingerprint && (delete_host || hash_hosts)) {
3738 error("Cannot use -l with -H or -R.");
3739 usage();
3740 }
3741 if (gen_krl) {
3742 do_gen_krl(pw, update_krl, ca_key_path,
3743 cert_serial, identity_comment, argc, argv);
3744 return (0);
3745 }
3746 if (check_krl) {
3747 do_check_krl(pw, print_fingerprint, argc, argv);
3748 return (0);
3749 }
3750 if (ca_key_path != NULL) {
3751 if (cert_key_id == NULL)
3752 fatal("Must specify key id (-I) when certifying");
3753 for (i = 0; i < nopts; i++)
3754 add_cert_option(opts[i]);
3755 do_ca_sign(pw, ca_key_path, prefer_agent,
3756 cert_serial, cert_serial_autoinc, argc, argv);
3757 }
3758 if (show_cert)
3759 do_show_cert(pw);
3760 if (delete_host || hash_hosts || find_host) {
3761 do_known_hosts(pw, rr_hostname, find_host,
3762 delete_host, hash_hosts);
3763 }
3764 if (pkcs11provider != NULL)
3765 do_download(pw);
3766 if (download_sk) {
3767 for (i = 0; i < nopts; i++) {
3768 if (strncasecmp(opts[i], "device=", 7) == 0) {
3769 sk_device = xstrdup(opts[i] + 7);
3770 } else {
3771 fatal("Option \"%s\" is unsupported for "
3772 "FIDO authenticator download", opts[i]);
3773 }
3774 }
3775 return do_download_sk(sk_provider, sk_device);
3776 }
3777 if (print_fingerprint || print_bubblebabble)
3778 do_fingerprint(pw);
3779 if (change_passphrase)
3780 do_change_passphrase(pw);
3781 if (change_comment)
3782 do_change_comment(pw, identity_comment);
3783 #ifdef WITH_OPENSSL
3784 if (convert_to)
3785 do_convert_to(pw);
3786 if (convert_from)
3787 do_convert_from(pw);
3788 #else /* WITH_OPENSSL */
3789 if (convert_to || convert_from)
3790 fatal("key conversion disabled at compile time");
3791 #endif /* WITH_OPENSSL */
3792 if (print_public)
3793 do_print_public(pw);
3794 if (rr_hostname != NULL) {
3795 unsigned int n = 0;
3796
3797 if (have_identity) {
3798 n = do_print_resource_record(pw, identity_file,
3799 rr_hostname, print_generic, opts, nopts);
3800 if (n == 0)
3801 fatal("%s: %s", identity_file, strerror(errno));
3802 exit(0);
3803 } else {
3804
3805 n += do_print_resource_record(pw,
3806 _PATH_HOST_RSA_KEY_FILE, rr_hostname,
3807 print_generic, opts, nopts);
3808 #ifdef WITH_DSA
3809 n += do_print_resource_record(pw,
3810 _PATH_HOST_DSA_KEY_FILE, rr_hostname,
3811 print_generic, opts, nopts);
3812 #endif
3813 n += do_print_resource_record(pw,
3814 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname,
3815 print_generic, opts, nopts);
3816 n += do_print_resource_record(pw,
3817 _PATH_HOST_ED25519_KEY_FILE, rr_hostname,
3818 print_generic, opts, nopts);
3819 n += do_print_resource_record(pw,
3820 _PATH_HOST_XMSS_KEY_FILE, rr_hostname,
3821 print_generic, opts, nopts);
3822 if (n == 0)
3823 fatal("no keys found.");
3824 exit(0);
3825 }
3826 }
3827
3828 if (do_gen_candidates || do_screen_candidates) {
3829 if (argc <= 0)
3830 fatal("No output file specified");
3831 else if (argc > 1)
3832 fatal("Too many output files specified");
3833 }
3834 if (do_gen_candidates) {
3835 do_moduli_gen(argv[0], opts, nopts);
3836 return 0;
3837 }
3838 if (do_screen_candidates) {
3839 do_moduli_screen(argv[0], opts, nopts);
3840 return 0;
3841 }
3842
3843 if (gen_all_hostkeys) {
3844 do_gen_all_hostkeys(pw);
3845 return (0);
3846 }
3847
3848 if (key_type_name == NULL)
3849 key_type_name = DEFAULT_KEY_TYPE_NAME;
3850
3851 type = sshkey_type_from_shortname(key_type_name);
3852 type_bits_valid(type, key_type_name, &bits);
3853
3854 if (!quiet)
3855 printf("Generating public/private %s key pair.\n",
3856 key_type_name);
3857 switch (type) {
3858 case KEY_ECDSA_SK:
3859 case KEY_ED25519_SK:
3860 for (i = 0; i < nopts; i++) {
3861 if (strcasecmp(opts[i], "no-touch-required") == 0) {
3862 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
3863 } else if (strcasecmp(opts[i], "verify-required") == 0) {
3864 sk_flags |= SSH_SK_USER_VERIFICATION_REQD;
3865 } else if (strcasecmp(opts[i], "resident") == 0) {
3866 sk_flags |= SSH_SK_RESIDENT_KEY;
3867 } else if (strncasecmp(opts[i], "device=", 7) == 0) {
3868 sk_device = xstrdup(opts[i] + 7);
3869 } else if (strncasecmp(opts[i], "user=", 5) == 0) {
3870 sk_user = xstrdup(opts[i] + 5);
3871 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) {
3872 if ((r = sshbuf_load_file(opts[i] + 10,
3873 &challenge)) != 0) {
3874 fatal_r(r, "Unable to load FIDO "
3875 "enrollment challenge \"%s\"",
3876 opts[i] + 10);
3877 }
3878 } else if (strncasecmp(opts[i],
3879 "write-attestation=", 18) == 0) {
3880 sk_attestation_path = opts[i] + 18;
3881 } else if (strncasecmp(opts[i],
3882 "application=", 12) == 0) {
3883 sk_application = xstrdup(opts[i] + 12);
3884 if (strncmp(sk_application, "ssh:", 4) != 0) {
3885 fatal("FIDO application string must "
3886 "begin with \"ssh:\"");
3887 }
3888 } else {
3889 fatal("Option \"%s\" is unsupported for "
3890 "FIDO authenticator enrollment", opts[i]);
3891 }
3892 }
3893 if ((attest = sshbuf_new()) == NULL)
3894 fatal("sshbuf_new failed");
3895 r = 0;
3896 for (i = 0 ;;) {
3897 if (!quiet) {
3898 printf("You may need to touch your "
3899 "authenticator%s to authorize key "
3900 "generation.\n",
3901 r == 0 ? "" : " again");
3902 }
3903 fflush(stdout);
3904 r = sshsk_enroll(type, sk_provider, sk_device,
3905 sk_application == NULL ? "ssh:" : sk_application,
3906 sk_user, sk_flags, passphrase, challenge,
3907 &private, attest);
3908 if (r == 0)
3909 break;
3910 if (r == SSH_ERR_KEY_BAD_PERMISSIONS &&
3911 (sk_flags & SSH_SK_RESIDENT_KEY) != 0 &&
3912 (sk_flags & SSH_SK_FORCE_OPERATION) == 0 &&
3913 confirm_sk_overwrite(sk_application, sk_user)) {
3914 sk_flags |= SSH_SK_FORCE_OPERATION;
3915 continue;
3916 }
3917 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
3918 fatal_r(r, "Key enrollment failed");
3919 else if (passphrase != NULL) {
3920 error("PIN incorrect");
3921 freezero(passphrase, strlen(passphrase));
3922 passphrase = NULL;
3923 }
3924 if (++i >= 3)
3925 fatal("Too many incorrect PINs");
3926 passphrase = read_passphrase("Enter PIN for "
3927 "authenticator: ", RP_ALLOW_STDIN);
3928 }
3929 if (passphrase != NULL) {
3930 freezero(passphrase, strlen(passphrase));
3931 passphrase = NULL;
3932 }
3933 break;
3934 default:
3935 if ((r = sshkey_generate(type, bits, &private)) != 0)
3936 fatal("sshkey_generate failed");
3937 break;
3938 }
3939 if ((r = sshkey_from_private(private, &public)) != 0)
3940 fatal_r(r, "sshkey_from_private");
3941
3942 if (!have_identity)
3943 ask_filename(pw, "Enter file in which to save the key");
3944
3945 /* Create ~/.ssh directory if it doesn't already exist. */
3946 hostfile_create_user_ssh_dir(identity_file, !quiet);
3947
3948 /* If the file already exists, ask the user to confirm. */
3949 if (!confirm_overwrite(identity_file))
3950 exit(1);
3951
3952 /* Determine the passphrase for the private key */
3953 passphrase = private_key_passphrase(identity_file);
3954 if (identity_comment) {
3955 strlcpy(comment, identity_comment, sizeof(comment));
3956 } else {
3957 /* Create default comment field for the passphrase. */
3958 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
3959 }
3960
3961 /* Save the key with the given passphrase and comment. */
3962 if ((r = sshkey_save_private(private, identity_file, passphrase,
3963 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
3964 error_r(r, "Saving key \"%s\" failed", identity_file);
3965 freezero(passphrase, strlen(passphrase));
3966 exit(1);
3967 }
3968 freezero(passphrase, strlen(passphrase));
3969 sshkey_free(private);
3970
3971 if (!quiet) {
3972 printf("Your identification has been saved in %s\n",
3973 identity_file);
3974 }
3975
3976 strlcat(identity_file, ".pub", sizeof(identity_file));
3977 if ((r = sshkey_save_public(public, identity_file, comment)) != 0)
3978 fatal_r(r, "Unable to save public key to %s", identity_file);
3979
3980 if (!quiet) {
3981 fp = sshkey_fingerprint(public, fingerprint_hash,
3982 SSH_FP_DEFAULT);
3983 ra = sshkey_fingerprint(public, fingerprint_hash,
3984 SSH_FP_RANDOMART);
3985 if (fp == NULL || ra == NULL)
3986 fatal("sshkey_fingerprint failed");
3987 printf("Your public key has been saved in %s\n",
3988 identity_file);
3989 printf("The key fingerprint is:\n");
3990 printf("%s %s\n", fp, comment);
3991 printf("The key's randomart image is:\n");
3992 printf("%s\n", ra);
3993 free(ra);
3994 free(fp);
3995 }
3996
3997 if (sk_attestation_path != NULL)
3998 save_attestation(attest, sk_attestation_path);
3999
4000 sshbuf_free(attest);
4001 sshkey_free(public);
4002
4003 exit(0);
4004 }
Portable OpenSSH is a multi-platform compatible version of OpenBSD's OpenSSH