1 /* $OpenBSD: ssh-keygen.c,v 1.472 2024/01/11 01:45:36 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
type_bits_valid(int type,const char * name,u_int32_t * bitsp)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
confirm_overwrite(const char * filename)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
ask_filename(struct passwd * pw,const char * prompt)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_name(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 *
load_identity(const char * filename,char ** commentp)314 load_identity(const char *filename, char **commentp)
315 {
316 char *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 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
330 r = sshkey_load_private(filename, pass, &prv, commentp);
331 freezero(pass, strlen(pass));
332 if (r != 0)
333 fatal_r(r, "Load key \"%s\"", filename);
334 return prv;
335 }
336
337 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
338 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
339 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
340 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
341
342 #ifdef WITH_OPENSSL
343 static void
do_convert_to_ssh2(struct passwd * pw,struct sshkey * k)344 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
345 {
346 struct sshbuf *b;
347 char comment[61], *b64;
348 int r;
349
350 if ((b = sshbuf_new()) == NULL)
351 fatal_f("sshbuf_new failed");
352 if ((r = sshkey_putb(k, b)) != 0)
353 fatal_fr(r, "put key");
354 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
355 fatal_f("sshbuf_dtob64_string failed");
356
357 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
358 snprintf(comment, sizeof(comment),
359 "%u-bit %s, converted by %s@%s from OpenSSH",
360 sshkey_size(k), sshkey_type(k),
361 pw->pw_name, hostname);
362
363 sshkey_free(k);
364 sshbuf_free(b);
365
366 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
367 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
368 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
369 free(b64);
370 exit(0);
371 }
372
373 static void
do_convert_to_pkcs8(struct sshkey * k)374 do_convert_to_pkcs8(struct sshkey *k)
375 {
376 switch (sshkey_type_plain(k->type)) {
377 case KEY_RSA:
378 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
379 fatal("PEM_write_RSA_PUBKEY failed");
380 break;
381 #ifdef WITH_DSA
382 case KEY_DSA:
383 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
384 fatal("PEM_write_DSA_PUBKEY failed");
385 break;
386 #endif
387 #ifdef OPENSSL_HAS_ECC
388 case KEY_ECDSA:
389 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
390 fatal("PEM_write_EC_PUBKEY failed");
391 break;
392 #endif
393 default:
394 fatal_f("unsupported key type %s", sshkey_type(k));
395 }
396 exit(0);
397 }
398
399 static void
do_convert_to_pem(struct sshkey * k)400 do_convert_to_pem(struct sshkey *k)
401 {
402 switch (sshkey_type_plain(k->type)) {
403 case KEY_RSA:
404 if (!PEM_write_RSAPublicKey(stdout, k->rsa))
405 fatal("PEM_write_RSAPublicKey failed");
406 break;
407 #ifdef WITH_DSA
408 case KEY_DSA:
409 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
410 fatal("PEM_write_DSA_PUBKEY failed");
411 break;
412 #endif
413 #ifdef OPENSSL_HAS_ECC
414 case KEY_ECDSA:
415 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
416 fatal("PEM_write_EC_PUBKEY failed");
417 break;
418 #endif
419 default:
420 fatal_f("unsupported key type %s", sshkey_type(k));
421 }
422 exit(0);
423 }
424
425 static void
do_convert_to(struct passwd * pw)426 do_convert_to(struct passwd *pw)
427 {
428 struct sshkey *k;
429 struct stat st;
430 int r;
431
432 if (!have_identity)
433 ask_filename(pw, "Enter file in which the key is");
434 if (stat(identity_file, &st) == -1)
435 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
436 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
437 k = load_identity(identity_file, NULL);
438 switch (convert_format) {
439 case FMT_RFC4716:
440 do_convert_to_ssh2(pw, k);
441 break;
442 case FMT_PKCS8:
443 do_convert_to_pkcs8(k);
444 break;
445 case FMT_PEM:
446 do_convert_to_pem(k);
447 break;
448 default:
449 fatal_f("unknown key format %d", convert_format);
450 }
451 exit(0);
452 }
453
454 /*
455 * This is almost exactly the bignum1 encoding, but with 32 bit for length
456 * instead of 16.
457 */
458 static void
buffer_get_bignum_bits(struct sshbuf * b,BIGNUM * value)459 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
460 {
461 u_int bytes, bignum_bits;
462 int r;
463
464 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
465 fatal_fr(r, "parse");
466 bytes = (bignum_bits + 7) / 8;
467 if (sshbuf_len(b) < bytes)
468 fatal_f("input buffer too small: need %d have %zu",
469 bytes, sshbuf_len(b));
470 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
471 fatal_f("BN_bin2bn failed");
472 if ((r = sshbuf_consume(b, bytes)) != 0)
473 fatal_fr(r, "consume");
474 }
475
476 static struct sshkey *
do_convert_private_ssh2(struct sshbuf * b)477 do_convert_private_ssh2(struct sshbuf *b)
478 {
479 struct sshkey *key = NULL;
480 char *type, *cipher;
481 const char *alg = NULL;
482 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
483 int r, rlen, ktype;
484 u_int magic, i1, i2, i3, i4;
485 size_t slen;
486 u_long e;
487 #ifdef WITH_DSA
488 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
489 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
490 #endif
491 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
492 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
493
494 if ((r = sshbuf_get_u32(b, &magic)) != 0)
495 fatal_fr(r, "parse magic");
496
497 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
498 error("bad magic 0x%x != 0x%x", magic,
499 SSH_COM_PRIVATE_KEY_MAGIC);
500 return NULL;
501 }
502 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
503 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
504 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
505 (r = sshbuf_get_u32(b, &i2)) != 0 ||
506 (r = sshbuf_get_u32(b, &i3)) != 0 ||
507 (r = sshbuf_get_u32(b, &i4)) != 0)
508 fatal_fr(r, "parse");
509 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
510 if (strcmp(cipher, "none") != 0) {
511 error("unsupported cipher %s", cipher);
512 free(cipher);
513 free(type);
514 return NULL;
515 }
516 free(cipher);
517
518 if (strstr(type, "rsa")) {
519 ktype = KEY_RSA;
520 #ifdef WITH_DSA
521 } else if (strstr(type, "dsa")) {
522 ktype = KEY_DSA;
523 #endif
524 } else {
525 free(type);
526 return NULL;
527 }
528 if ((key = sshkey_new(ktype)) == NULL)
529 fatal("sshkey_new failed");
530 free(type);
531
532 switch (key->type) {
533 #ifdef WITH_DSA
534 case KEY_DSA:
535 if ((dsa_p = BN_new()) == NULL ||
536 (dsa_q = BN_new()) == NULL ||
537 (dsa_g = BN_new()) == NULL ||
538 (dsa_pub_key = BN_new()) == NULL ||
539 (dsa_priv_key = BN_new()) == NULL)
540 fatal_f("BN_new");
541 buffer_get_bignum_bits(b, dsa_p);
542 buffer_get_bignum_bits(b, dsa_g);
543 buffer_get_bignum_bits(b, dsa_q);
544 buffer_get_bignum_bits(b, dsa_pub_key);
545 buffer_get_bignum_bits(b, dsa_priv_key);
546 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
547 fatal_f("DSA_set0_pqg failed");
548 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
549 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
550 fatal_f("DSA_set0_key failed");
551 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
552 break;
553 #endif
554 case KEY_RSA:
555 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
556 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
557 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
558 fatal_fr(r, "parse RSA");
559 e = e1;
560 debug("e %lx", e);
561 if (e < 30) {
562 e <<= 8;
563 e += e2;
564 debug("e %lx", e);
565 e <<= 8;
566 e += e3;
567 debug("e %lx", e);
568 }
569 if ((rsa_e = BN_new()) == NULL)
570 fatal_f("BN_new");
571 if (!BN_set_word(rsa_e, e)) {
572 BN_clear_free(rsa_e);
573 sshkey_free(key);
574 return NULL;
575 }
576 if ((rsa_n = BN_new()) == NULL ||
577 (rsa_d = BN_new()) == NULL ||
578 (rsa_p = BN_new()) == NULL ||
579 (rsa_q = BN_new()) == NULL ||
580 (rsa_iqmp = BN_new()) == NULL)
581 fatal_f("BN_new");
582 buffer_get_bignum_bits(b, rsa_d);
583 buffer_get_bignum_bits(b, rsa_n);
584 buffer_get_bignum_bits(b, rsa_iqmp);
585 buffer_get_bignum_bits(b, rsa_q);
586 buffer_get_bignum_bits(b, rsa_p);
587 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d))
588 fatal_f("RSA_set0_key failed");
589 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
590 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q))
591 fatal_f("RSA_set0_factors failed");
592 rsa_p = rsa_q = NULL; /* transferred */
593 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
594 fatal_fr(r, "generate RSA parameters");
595 BN_clear_free(rsa_iqmp);
596 alg = "rsa-sha2-256";
597 break;
598 }
599 rlen = sshbuf_len(b);
600 if (rlen != 0)
601 error_f("remaining bytes in key blob %d", rlen);
602
603 /* try the key */
604 if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data),
605 alg, NULL, NULL, 0)) != 0)
606 error_fr(r, "signing with converted key failed");
607 else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
608 alg, 0, NULL)) != 0)
609 error_fr(r, "verification with converted key failed");
610 if (r != 0) {
611 sshkey_free(key);
612 free(sig);
613 return NULL;
614 }
615 free(sig);
616 return key;
617 }
618
619 static int
get_line(FILE * fp,char * line,size_t len)620 get_line(FILE *fp, char *line, size_t len)
621 {
622 int c;
623 size_t pos = 0;
624
625 line[0] = '\0';
626 while ((c = fgetc(fp)) != EOF) {
627 if (pos >= len - 1)
628 fatal("input line too long.");
629 switch (c) {
630 case '\r':
631 c = fgetc(fp);
632 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
633 fatal("unget: %s", strerror(errno));
634 return pos;
635 case '\n':
636 return pos;
637 }
638 line[pos++] = c;
639 line[pos] = '\0';
640 }
641 /* We reached EOF */
642 return -1;
643 }
644
645 static void
do_convert_from_ssh2(struct passwd * pw,struct sshkey ** k,int * private)646 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
647 {
648 int r, blen, escaped = 0;
649 u_int len;
650 char line[1024];
651 struct sshbuf *buf;
652 char encoded[8096];
653 FILE *fp;
654
655 if ((buf = sshbuf_new()) == NULL)
656 fatal("sshbuf_new failed");
657 if ((fp = fopen(identity_file, "r")) == NULL)
658 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
659 encoded[0] = '\0';
660 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
661 if (blen > 0 && line[blen - 1] == '\\')
662 escaped++;
663 if (strncmp(line, "----", 4) == 0 ||
664 strstr(line, ": ") != NULL) {
665 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
666 *private = 1;
667 if (strstr(line, " END ") != NULL) {
668 break;
669 }
670 /* fprintf(stderr, "ignore: %s", line); */
671 continue;
672 }
673 if (escaped) {
674 escaped--;
675 /* fprintf(stderr, "escaped: %s", line); */
676 continue;
677 }
678 strlcat(encoded, line, sizeof(encoded));
679 }
680 len = strlen(encoded);
681 if (((len % 4) == 3) &&
682 (encoded[len-1] == '=') &&
683 (encoded[len-2] == '=') &&
684 (encoded[len-3] == '='))
685 encoded[len-3] = '\0';
686 if ((r = sshbuf_b64tod(buf, encoded)) != 0)
687 fatal_fr(r, "base64 decode");
688 if (*private) {
689 if ((*k = do_convert_private_ssh2(buf)) == NULL)
690 fatal_f("private key conversion failed");
691 } else if ((r = sshkey_fromb(buf, k)) != 0)
692 fatal_fr(r, "parse key");
693 sshbuf_free(buf);
694 fclose(fp);
695 }
696
697 static void
do_convert_from_pkcs8(struct sshkey ** k,int * private)698 do_convert_from_pkcs8(struct sshkey **k, int *private)
699 {
700 EVP_PKEY *pubkey;
701 FILE *fp;
702
703 if ((fp = fopen(identity_file, "r")) == NULL)
704 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
705 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
706 fatal_f("%s is not a recognised public key format",
707 identity_file);
708 }
709 fclose(fp);
710 switch (EVP_PKEY_base_id(pubkey)) {
711 case EVP_PKEY_RSA:
712 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
713 fatal("sshkey_new failed");
714 (*k)->type = KEY_RSA;
715 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
716 break;
717 #ifdef WITH_DSA
718 case EVP_PKEY_DSA:
719 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
720 fatal("sshkey_new failed");
721 (*k)->type = KEY_DSA;
722 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
723 break;
724 #endif
725 #ifdef OPENSSL_HAS_ECC
726 case EVP_PKEY_EC:
727 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
728 fatal("sshkey_new failed");
729 (*k)->type = KEY_ECDSA;
730 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
731 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
732 break;
733 #endif
734 default:
735 fatal_f("unsupported pubkey type %d",
736 EVP_PKEY_base_id(pubkey));
737 }
738 EVP_PKEY_free(pubkey);
739 return;
740 }
741
742 static void
do_convert_from_pem(struct sshkey ** k,int * private)743 do_convert_from_pem(struct sshkey **k, int *private)
744 {
745 FILE *fp;
746 RSA *rsa;
747
748 if ((fp = fopen(identity_file, "r")) == NULL)
749 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
750 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
751 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
752 fatal("sshkey_new failed");
753 (*k)->type = KEY_RSA;
754 (*k)->rsa = rsa;
755 fclose(fp);
756 return;
757 }
758 fatal_f("unrecognised raw private key format");
759 }
760
761 static void
do_convert_from(struct passwd * pw)762 do_convert_from(struct passwd *pw)
763 {
764 struct sshkey *k = NULL;
765 int r, private = 0, ok = 0;
766 struct stat st;
767
768 if (!have_identity)
769 ask_filename(pw, "Enter file in which the key is");
770 if (stat(identity_file, &st) == -1)
771 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
772
773 switch (convert_format) {
774 case FMT_RFC4716:
775 do_convert_from_ssh2(pw, &k, &private);
776 break;
777 case FMT_PKCS8:
778 do_convert_from_pkcs8(&k, &private);
779 break;
780 case FMT_PEM:
781 do_convert_from_pem(&k, &private);
782 break;
783 default:
784 fatal_f("unknown key format %d", convert_format);
785 }
786
787 if (!private) {
788 if ((r = sshkey_write(k, stdout)) == 0)
789 ok = 1;
790 if (ok)
791 fprintf(stdout, "\n");
792 } else {
793 switch (k->type) {
794 #ifdef WITH_DSA
795 case KEY_DSA:
796 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
797 NULL, 0, NULL, NULL);
798 break;
799 #endif
800 #ifdef OPENSSL_HAS_ECC
801 case KEY_ECDSA:
802 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
803 NULL, 0, NULL, NULL);
804 break;
805 #endif
806 case KEY_RSA:
807 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
808 NULL, 0, NULL, NULL);
809 break;
810 default:
811 fatal_f("unsupported key type %s", sshkey_type(k));
812 }
813 }
814
815 if (!ok)
816 fatal("key write failed");
817 sshkey_free(k);
818 exit(0);
819 }
820 #endif
821
822 static void
do_print_public(struct passwd * pw)823 do_print_public(struct passwd *pw)
824 {
825 struct sshkey *prv;
826 struct stat st;
827 int r;
828 char *comment = NULL;
829
830 if (!have_identity)
831 ask_filename(pw, "Enter file in which the key is");
832 if (stat(identity_file, &st) == -1)
833 fatal("%s: %s", identity_file, strerror(errno));
834 prv = load_identity(identity_file, &comment);
835 if ((r = sshkey_write(prv, stdout)) != 0)
836 fatal_fr(r, "write key");
837 if (comment != NULL && *comment != '\0')
838 fprintf(stdout, " %s", comment);
839 fprintf(stdout, "\n");
840 if (sshkey_is_sk(prv)) {
841 debug("sk_application: \"%s\", sk_flags 0x%02x",
842 prv->sk_application, prv->sk_flags);
843 }
844 sshkey_free(prv);
845 free(comment);
846 exit(0);
847 }
848
849 static void
do_download(struct passwd * pw)850 do_download(struct passwd *pw)
851 {
852 #ifdef ENABLE_PKCS11
853 struct sshkey **keys = NULL;
854 int i, nkeys;
855 enum sshkey_fp_rep rep;
856 int fptype;
857 char *fp, *ra, **comments = NULL;
858
859 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
860 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
861
862 pkcs11_init(1);
863 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments);
864 if (nkeys <= 0)
865 fatal("cannot read public key from pkcs11");
866 for (i = 0; i < nkeys; i++) {
867 if (print_fingerprint) {
868 fp = sshkey_fingerprint(keys[i], fptype, rep);
869 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
870 SSH_FP_RANDOMART);
871 if (fp == NULL || ra == NULL)
872 fatal_f("sshkey_fingerprint fail");
873 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
874 fp, sshkey_type(keys[i]));
875 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
876 printf("%s\n", ra);
877 free(ra);
878 free(fp);
879 } else {
880 (void) sshkey_write(keys[i], stdout); /* XXX check */
881 fprintf(stdout, "%s%s\n",
882 *(comments[i]) == '\0' ? "" : " ", comments[i]);
883 }
884 free(comments[i]);
885 sshkey_free(keys[i]);
886 }
887 free(comments);
888 free(keys);
889 pkcs11_terminate();
890 exit(0);
891 #else
892 fatal("no pkcs11 support");
893 #endif /* ENABLE_PKCS11 */
894 }
895
896 static struct sshkey *
try_read_key(char ** cpp)897 try_read_key(char **cpp)
898 {
899 struct sshkey *ret;
900 int r;
901
902 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
903 fatal("sshkey_new failed");
904 if ((r = sshkey_read(ret, cpp)) == 0)
905 return ret;
906 /* Not a key */
907 sshkey_free(ret);
908 return NULL;
909 }
910
911 static void
fingerprint_one_key(const struct sshkey * public,const char * comment)912 fingerprint_one_key(const struct sshkey *public, const char *comment)
913 {
914 char *fp = NULL, *ra = NULL;
915 enum sshkey_fp_rep rep;
916 int fptype;
917
918 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
919 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
920 fp = sshkey_fingerprint(public, fptype, rep);
921 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
922 if (fp == NULL || ra == NULL)
923 fatal_f("sshkey_fingerprint failed");
924 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
925 comment ? comment : "no comment", sshkey_type(public));
926 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
927 printf("%s\n", ra);
928 free(ra);
929 free(fp);
930 }
931
932 static void
fingerprint_private(const char * path)933 fingerprint_private(const char *path)
934 {
935 struct stat st;
936 char *comment = NULL;
937 struct sshkey *privkey = NULL, *pubkey = NULL;
938 int r;
939
940 if (stat(identity_file, &st) == -1)
941 fatal("%s: %s", path, strerror(errno));
942 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0)
943 debug_r(r, "load public \"%s\"", path);
944 if (pubkey == NULL || comment == NULL || *comment == '\0') {
945 free(comment);
946 if ((r = sshkey_load_private(path, NULL,
947 &privkey, &comment)) != 0)
948 debug_r(r, "load private \"%s\"", path);
949 }
950 if (pubkey == NULL && privkey == NULL)
951 fatal("%s is not a key file.", path);
952
953 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment);
954 sshkey_free(pubkey);
955 sshkey_free(privkey);
956 free(comment);
957 }
958
959 static void
do_fingerprint(struct passwd * pw)960 do_fingerprint(struct passwd *pw)
961 {
962 FILE *f;
963 struct sshkey *public = NULL;
964 char *comment = NULL, *cp, *ep, *line = NULL;
965 size_t linesize = 0;
966 int i, invalid = 1;
967 const char *path;
968 u_long lnum = 0;
969
970 if (!have_identity)
971 ask_filename(pw, "Enter file in which the key is");
972 path = identity_file;
973
974 if (strcmp(identity_file, "-") == 0) {
975 f = stdin;
976 path = "(stdin)";
977 } else if ((f = fopen(path, "r")) == NULL)
978 fatal("%s: %s: %s", __progname, path, strerror(errno));
979
980 while (getline(&line, &linesize, f) != -1) {
981 lnum++;
982 cp = line;
983 cp[strcspn(cp, "\n")] = '\0';
984 /* Trim leading space and comments */
985 cp = line + strspn(line, " \t");
986 if (*cp == '#' || *cp == '\0')
987 continue;
988
989 /*
990 * Input may be plain keys, private keys, authorized_keys
991 * or known_hosts.
992 */
993
994 /*
995 * Try private keys first. Assume a key is private if
996 * "SSH PRIVATE KEY" appears on the first line and we're
997 * not reading from stdin (XXX support private keys on stdin).
998 */
999 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
1000 strstr(cp, "PRIVATE KEY") != NULL) {
1001 free(line);
1002 fclose(f);
1003 fingerprint_private(path);
1004 exit(0);
1005 }
1006
1007 /*
1008 * If it's not a private key, then this must be prepared to
1009 * accept a public key prefixed with a hostname or options.
1010 * Try a bare key first, otherwise skip the leading stuff.
1011 */
1012 comment = NULL;
1013 if ((public = try_read_key(&cp)) == NULL) {
1014 i = strtol(cp, &ep, 10);
1015 if (i == 0 || ep == NULL ||
1016 (*ep != ' ' && *ep != '\t')) {
1017 int quoted = 0;
1018
1019 comment = cp;
1020 for (; *cp && (quoted || (*cp != ' ' &&
1021 *cp != '\t')); cp++) {
1022 if (*cp == '\\' && cp[1] == '"')
1023 cp++; /* Skip both */
1024 else if (*cp == '"')
1025 quoted = !quoted;
1026 }
1027 if (!*cp)
1028 continue;
1029 *cp++ = '\0';
1030 }
1031 }
1032 /* Retry after parsing leading hostname/key options */
1033 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
1034 debug("%s:%lu: not a public key", path, lnum);
1035 continue;
1036 }
1037
1038 /* Find trailing comment, if any */
1039 for (; *cp == ' ' || *cp == '\t'; cp++)
1040 ;
1041 if (*cp != '\0' && *cp != '#')
1042 comment = cp;
1043
1044 fingerprint_one_key(public, comment);
1045 sshkey_free(public);
1046 invalid = 0; /* One good key in the file is sufficient */
1047 }
1048 fclose(f);
1049 free(line);
1050
1051 if (invalid)
1052 fatal("%s is not a public key file.", path);
1053 exit(0);
1054 }
1055
1056 static void
do_gen_all_hostkeys(struct passwd * pw)1057 do_gen_all_hostkeys(struct passwd *pw)
1058 {
1059 struct {
1060 char *key_type;
1061 char *key_type_display;
1062 char *path;
1063 } key_types[] = {
1064 #ifdef WITH_OPENSSL
1065 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
1066 #ifdef OPENSSL_HAS_ECC
1067 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
1068 #endif /* OPENSSL_HAS_ECC */
1069 #endif /* WITH_OPENSSL */
1070 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
1071 #ifdef WITH_XMSS
1072 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE },
1073 #endif /* WITH_XMSS */
1074 { NULL, NULL, NULL }
1075 };
1076
1077 u_int32_t bits = 0;
1078 int first = 0;
1079 struct stat st;
1080 struct sshkey *private, *public;
1081 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1082 int i, type, fd, r;
1083
1084 for (i = 0; key_types[i].key_type; i++) {
1085 public = private = NULL;
1086 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1087
1088 xasprintf(&prv_file, "%s%s",
1089 identity_file, key_types[i].path);
1090
1091 /* Check whether private key exists and is not zero-length */
1092 if (stat(prv_file, &st) == 0) {
1093 if (st.st_size != 0)
1094 goto next;
1095 } else if (errno != ENOENT) {
1096 error("Could not stat %s: %s", key_types[i].path,
1097 strerror(errno));
1098 goto failnext;
1099 }
1100
1101 /*
1102 * Private key doesn't exist or is invalid; proceed with
1103 * key generation.
1104 */
1105 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1106 identity_file, key_types[i].path);
1107 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1108 identity_file, key_types[i].path);
1109 xasprintf(&pub_file, "%s%s.pub",
1110 identity_file, key_types[i].path);
1111
1112 if (first == 0) {
1113 first = 1;
1114 printf("%s: generating new host keys: ", __progname);
1115 }
1116 printf("%s ", key_types[i].key_type_display);
1117 fflush(stdout);
1118 type = sshkey_type_from_name(key_types[i].key_type);
1119 if ((fd = mkstemp(prv_tmp)) == -1) {
1120 error("Could not save your private key in %s: %s",
1121 prv_tmp, strerror(errno));
1122 goto failnext;
1123 }
1124 (void)close(fd); /* just using mkstemp() to reserve a name */
1125 bits = 0;
1126 type_bits_valid(type, NULL, &bits);
1127 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1128 error_r(r, "sshkey_generate failed");
1129 goto failnext;
1130 }
1131 if ((r = sshkey_from_private(private, &public)) != 0)
1132 fatal_fr(r, "sshkey_from_private");
1133 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1134 hostname);
1135 if ((r = sshkey_save_private(private, prv_tmp, "",
1136 comment, private_key_format, openssh_format_cipher,
1137 rounds)) != 0) {
1138 error_r(r, "Saving key \"%s\" failed", prv_tmp);
1139 goto failnext;
1140 }
1141 if ((fd = mkstemp(pub_tmp)) == -1) {
1142 error("Could not save your public key in %s: %s",
1143 pub_tmp, strerror(errno));
1144 goto failnext;
1145 }
1146 (void)fchmod(fd, 0644);
1147 (void)close(fd);
1148 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) {
1149 error_r(r, "Unable to save public key to %s",
1150 identity_file);
1151 goto failnext;
1152 }
1153
1154 /* Rename temporary files to their permanent locations. */
1155 if (rename(pub_tmp, pub_file) != 0) {
1156 error("Unable to move %s into position: %s",
1157 pub_file, strerror(errno));
1158 goto failnext;
1159 }
1160 if (rename(prv_tmp, prv_file) != 0) {
1161 error("Unable to move %s into position: %s",
1162 key_types[i].path, strerror(errno));
1163 failnext:
1164 first = 0;
1165 goto next;
1166 }
1167 next:
1168 sshkey_free(private);
1169 sshkey_free(public);
1170 free(prv_tmp);
1171 free(pub_tmp);
1172 free(prv_file);
1173 free(pub_file);
1174 }
1175 if (first != 0)
1176 printf("\n");
1177 }
1178
1179 struct known_hosts_ctx {
1180 const char *host; /* Hostname searched for in find/delete case */
1181 FILE *out; /* Output file, stdout for find_hosts case */
1182 int has_unhashed; /* When hashing, original had unhashed hosts */
1183 int found_key; /* For find/delete, host was found */
1184 int invalid; /* File contained invalid items; don't delete */
1185 int hash_hosts; /* Hash hostnames as we go */
1186 int find_host; /* Search for specific hostname */
1187 int delete_host; /* Delete host from known_hosts */
1188 };
1189
1190 static int
known_hosts_hash(struct hostkey_foreach_line * l,void * _ctx)1191 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1192 {
1193 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1194 char *hashed, *cp, *hosts, *ohosts;
1195 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1196 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1197
1198 switch (l->status) {
1199 case HKF_STATUS_OK:
1200 case HKF_STATUS_MATCHED:
1201 /*
1202 * Don't hash hosts already hashed, with wildcard
1203 * characters or a CA/revocation marker.
1204 */
1205 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1206 fprintf(ctx->out, "%s\n", l->line);
1207 if (has_wild && !ctx->find_host) {
1208 logit("%s:%lu: ignoring host name "
1209 "with wildcard: %.64s", l->path,
1210 l->linenum, l->hosts);
1211 }
1212 return 0;
1213 }
1214 /*
1215 * Split any comma-separated hostnames from the host list,
1216 * hash and store separately.
1217 */
1218 ohosts = hosts = xstrdup(l->hosts);
1219 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1220 lowercase(cp);
1221 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1222 fatal("hash_host failed");
1223 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1224 free(hashed);
1225 ctx->has_unhashed = 1;
1226 }
1227 free(ohosts);
1228 return 0;
1229 case HKF_STATUS_INVALID:
1230 /* Retain invalid lines, but mark file as invalid. */
1231 ctx->invalid = 1;
1232 logit("%s:%lu: invalid line", l->path, l->linenum);
1233 /* FALLTHROUGH */
1234 default:
1235 fprintf(ctx->out, "%s\n", l->line);
1236 return 0;
1237 }
1238 /* NOTREACHED */
1239 return -1;
1240 }
1241
1242 static int
known_hosts_find_delete(struct hostkey_foreach_line * l,void * _ctx)1243 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1244 {
1245 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1246 enum sshkey_fp_rep rep;
1247 int fptype;
1248 char *fp = NULL, *ra = NULL;
1249
1250 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1251 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1252
1253 if (l->status == HKF_STATUS_MATCHED) {
1254 if (ctx->delete_host) {
1255 if (l->marker != MRK_NONE) {
1256 /* Don't remove CA and revocation lines */
1257 fprintf(ctx->out, "%s\n", l->line);
1258 } else {
1259 /*
1260 * Hostname matches and has no CA/revoke
1261 * marker, delete it by *not* writing the
1262 * line to ctx->out.
1263 */
1264 ctx->found_key = 1;
1265 if (!quiet)
1266 printf("# Host %s found: line %lu\n",
1267 ctx->host, l->linenum);
1268 }
1269 return 0;
1270 } else if (ctx->find_host) {
1271 ctx->found_key = 1;
1272 if (!quiet) {
1273 printf("# Host %s found: line %lu %s\n",
1274 ctx->host,
1275 l->linenum, l->marker == MRK_CA ? "CA" :
1276 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1277 }
1278 if (ctx->hash_hosts)
1279 known_hosts_hash(l, ctx);
1280 else if (print_fingerprint) {
1281 fp = sshkey_fingerprint(l->key, fptype, rep);
1282 ra = sshkey_fingerprint(l->key,
1283 fingerprint_hash, SSH_FP_RANDOMART);
1284 if (fp == NULL || ra == NULL)
1285 fatal_f("sshkey_fingerprint failed");
1286 mprintf("%s %s %s%s%s\n", ctx->host,
1287 sshkey_type(l->key), fp,
1288 l->comment[0] ? " " : "",
1289 l->comment);
1290 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
1291 printf("%s\n", ra);
1292 free(ra);
1293 free(fp);
1294 } else
1295 fprintf(ctx->out, "%s\n", l->line);
1296 return 0;
1297 }
1298 } else if (ctx->delete_host) {
1299 /* Retain non-matching hosts when deleting */
1300 if (l->status == HKF_STATUS_INVALID) {
1301 ctx->invalid = 1;
1302 logit("%s:%lu: invalid line", l->path, l->linenum);
1303 }
1304 fprintf(ctx->out, "%s\n", l->line);
1305 }
1306 return 0;
1307 }
1308
1309 static void
do_known_hosts(struct passwd * pw,const char * name,int find_host,int delete_host,int hash_hosts)1310 do_known_hosts(struct passwd *pw, const char *name, int find_host,
1311 int delete_host, int hash_hosts)
1312 {
1313 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1314 int r, fd, oerrno, inplace = 0;
1315 struct known_hosts_ctx ctx;
1316 u_int foreach_options;
1317 struct stat sb;
1318
1319 if (!have_identity) {
1320 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1321 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1322 sizeof(identity_file))
1323 fatal("Specified known hosts path too long");
1324 free(cp);
1325 have_identity = 1;
1326 }
1327 if (stat(identity_file, &sb) != 0)
1328 fatal("Cannot stat %s: %s", identity_file, strerror(errno));
1329
1330 memset(&ctx, 0, sizeof(ctx));
1331 ctx.out = stdout;
1332 ctx.host = name;
1333 ctx.hash_hosts = hash_hosts;
1334 ctx.find_host = find_host;
1335 ctx.delete_host = delete_host;
1336
1337 /*
1338 * Find hosts goes to stdout, hash and deletions happen in-place
1339 * A corner case is ssh-keygen -HF foo, which should go to stdout
1340 */
1341 if (!find_host && (hash_hosts || delete_host)) {
1342 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1343 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1344 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1345 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1346 fatal("known_hosts path too long");
1347 umask(077);
1348 if ((fd = mkstemp(tmp)) == -1)
1349 fatal("mkstemp: %s", strerror(errno));
1350 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1351 oerrno = errno;
1352 unlink(tmp);
1353 fatal("fdopen: %s", strerror(oerrno));
1354 }
1355 (void)fchmod(fd, sb.st_mode & 0644);
1356 inplace = 1;
1357 }
1358 /* XXX support identity_file == "-" for stdin */
1359 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1360 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1361 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ?
1362 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL,
1363 foreach_options, 0)) != 0) {
1364 if (inplace)
1365 unlink(tmp);
1366 fatal_fr(r, "hostkeys_foreach");
1367 }
1368
1369 if (inplace)
1370 fclose(ctx.out);
1371
1372 if (ctx.invalid) {
1373 error("%s is not a valid known_hosts file.", identity_file);
1374 if (inplace) {
1375 error("Not replacing existing known_hosts "
1376 "file because of errors");
1377 unlink(tmp);
1378 }
1379 exit(1);
1380 } else if (delete_host && !ctx.found_key) {
1381 logit("Host %s not found in %s", name, identity_file);
1382 if (inplace)
1383 unlink(tmp);
1384 } else if (inplace) {
1385 /* Backup existing file */
1386 if (unlink(old) == -1 && errno != ENOENT)
1387 fatal("unlink %.100s: %s", old, strerror(errno));
1388 if (link(identity_file, old) == -1)
1389 fatal("link %.100s to %.100s: %s", identity_file, old,
1390 strerror(errno));
1391 /* Move new one into place */
1392 if (rename(tmp, identity_file) == -1) {
1393 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1394 strerror(errno));
1395 unlink(tmp);
1396 unlink(old);
1397 exit(1);
1398 }
1399
1400 printf("%s updated.\n", identity_file);
1401 printf("Original contents retained as %s\n", old);
1402 if (ctx.has_unhashed) {
1403 logit("WARNING: %s contains unhashed entries", old);
1404 logit("Delete this file to ensure privacy "
1405 "of hostnames");
1406 }
1407 }
1408
1409 exit (find_host && !ctx.found_key);
1410 }
1411
1412 /*
1413 * Perform changing a passphrase. The argument is the passwd structure
1414 * for the current user.
1415 */
1416 static void
do_change_passphrase(struct passwd * pw)1417 do_change_passphrase(struct passwd *pw)
1418 {
1419 char *comment;
1420 char *old_passphrase, *passphrase1, *passphrase2;
1421 struct stat st;
1422 struct sshkey *private;
1423 int r;
1424
1425 if (!have_identity)
1426 ask_filename(pw, "Enter file in which the key is");
1427 if (stat(identity_file, &st) == -1)
1428 fatal("%s: %s", identity_file, strerror(errno));
1429 /* Try to load the file with empty passphrase. */
1430 r = sshkey_load_private(identity_file, "", &private, &comment);
1431 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1432 if (identity_passphrase)
1433 old_passphrase = xstrdup(identity_passphrase);
1434 else
1435 old_passphrase =
1436 read_passphrase("Enter old passphrase: ",
1437 RP_ALLOW_STDIN);
1438 r = sshkey_load_private(identity_file, old_passphrase,
1439 &private, &comment);
1440 freezero(old_passphrase, strlen(old_passphrase));
1441 if (r != 0)
1442 goto badkey;
1443 } else if (r != 0) {
1444 badkey:
1445 fatal_r(r, "Failed to load key %s", identity_file);
1446 }
1447 if (comment)
1448 mprintf("Key has comment '%s'\n", comment);
1449
1450 /* Ask the new passphrase (twice). */
1451 if (identity_new_passphrase) {
1452 passphrase1 = xstrdup(identity_new_passphrase);
1453 passphrase2 = NULL;
1454 } else {
1455 passphrase1 =
1456 read_passphrase("Enter new passphrase (empty for no "
1457 "passphrase): ", RP_ALLOW_STDIN);
1458 passphrase2 = read_passphrase("Enter same passphrase again: ",
1459 RP_ALLOW_STDIN);
1460
1461 /* Verify that they are the same. */
1462 if (strcmp(passphrase1, passphrase2) != 0) {
1463 explicit_bzero(passphrase1, strlen(passphrase1));
1464 explicit_bzero(passphrase2, strlen(passphrase2));
1465 free(passphrase1);
1466 free(passphrase2);
1467 printf("Pass phrases do not match. Try again.\n");
1468 exit(1);
1469 }
1470 /* Destroy the other copy. */
1471 freezero(passphrase2, strlen(passphrase2));
1472 }
1473
1474 /* Save the file using the new passphrase. */
1475 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1476 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
1477 error_r(r, "Saving key \"%s\" failed", identity_file);
1478 freezero(passphrase1, strlen(passphrase1));
1479 sshkey_free(private);
1480 free(comment);
1481 exit(1);
1482 }
1483 /* Destroy the passphrase and the copy of the key in memory. */
1484 freezero(passphrase1, strlen(passphrase1));
1485 sshkey_free(private); /* Destroys contents */
1486 free(comment);
1487
1488 printf("Your identification has been saved with the new passphrase.\n");
1489 exit(0);
1490 }
1491
1492 /*
1493 * Print the SSHFP RR.
1494 */
1495 static int
do_print_resource_record(struct passwd * pw,char * fname,char * hname,int print_generic,char * const * opts,size_t nopts)1496 do_print_resource_record(struct passwd *pw, char *fname, char *hname,
1497 int print_generic, char * const *opts, size_t nopts)
1498 {
1499 struct sshkey *public;
1500 char *comment = NULL;
1501 struct stat st;
1502 int r, hash = -1;
1503 size_t i;
1504
1505 for (i = 0; i < nopts; i++) {
1506 if (strncasecmp(opts[i], "hashalg=", 8) == 0) {
1507 if ((hash = ssh_digest_alg_by_name(opts[i] + 8)) == -1)
1508 fatal("Unsupported hash algorithm");
1509 } else {
1510 error("Invalid option \"%s\"", opts[i]);
1511 return SSH_ERR_INVALID_ARGUMENT;
1512 }
1513 }
1514 if (fname == NULL)
1515 fatal_f("no filename");
1516 if (stat(fname, &st) == -1) {
1517 if (errno == ENOENT)
1518 return 0;
1519 fatal("%s: %s", fname, strerror(errno));
1520 }
1521 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1522 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname);
1523 export_dns_rr(hname, public, stdout, print_generic, hash);
1524 sshkey_free(public);
1525 free(comment);
1526 return 1;
1527 }
1528
1529 /*
1530 * Change the comment of a private key file.
1531 */
1532 static void
do_change_comment(struct passwd * pw,const char * identity_comment)1533 do_change_comment(struct passwd *pw, const char *identity_comment)
1534 {
1535 char new_comment[1024], *comment, *passphrase;
1536 struct sshkey *private;
1537 struct sshkey *public;
1538 struct stat st;
1539 int r;
1540
1541 if (!have_identity)
1542 ask_filename(pw, "Enter file in which the key is");
1543 if (stat(identity_file, &st) == -1)
1544 fatal("%s: %s", identity_file, strerror(errno));
1545 if ((r = sshkey_load_private(identity_file, "",
1546 &private, &comment)) == 0)
1547 passphrase = xstrdup("");
1548 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1549 fatal_r(r, "Cannot load private key \"%s\"", identity_file);
1550 else {
1551 if (identity_passphrase)
1552 passphrase = xstrdup(identity_passphrase);
1553 else if (identity_new_passphrase)
1554 passphrase = xstrdup(identity_new_passphrase);
1555 else
1556 passphrase = read_passphrase("Enter passphrase: ",
1557 RP_ALLOW_STDIN);
1558 /* Try to load using the passphrase. */
1559 if ((r = sshkey_load_private(identity_file, passphrase,
1560 &private, &comment)) != 0) {
1561 freezero(passphrase, strlen(passphrase));
1562 fatal_r(r, "Cannot load private key \"%s\"",
1563 identity_file);
1564 }
1565 }
1566
1567 if (private->type != KEY_ED25519 && private->type != KEY_XMSS &&
1568 private_key_format != SSHKEY_PRIVATE_OPENSSH) {
1569 error("Comments are only supported for keys stored in "
1570 "the new format (-o).");
1571 explicit_bzero(passphrase, strlen(passphrase));
1572 sshkey_free(private);
1573 exit(1);
1574 }
1575 if (comment)
1576 printf("Old comment: %s\n", comment);
1577 else
1578 printf("No existing comment\n");
1579
1580 if (identity_comment) {
1581 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1582 } else {
1583 printf("New comment: ");
1584 fflush(stdout);
1585 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1586 explicit_bzero(passphrase, strlen(passphrase));
1587 sshkey_free(private);
1588 exit(1);
1589 }
1590 new_comment[strcspn(new_comment, "\n")] = '\0';
1591 }
1592 if (comment != NULL && strcmp(comment, new_comment) == 0) {
1593 printf("No change to comment\n");
1594 free(passphrase);
1595 sshkey_free(private);
1596 free(comment);
1597 exit(0);
1598 }
1599
1600 /* Save the file using the new passphrase. */
1601 if ((r = sshkey_save_private(private, identity_file, passphrase,
1602 new_comment, private_key_format, openssh_format_cipher,
1603 rounds)) != 0) {
1604 error_r(r, "Saving key \"%s\" failed", identity_file);
1605 freezero(passphrase, strlen(passphrase));
1606 sshkey_free(private);
1607 free(comment);
1608 exit(1);
1609 }
1610 freezero(passphrase, strlen(passphrase));
1611 if ((r = sshkey_from_private(private, &public)) != 0)
1612 fatal_fr(r, "sshkey_from_private");
1613 sshkey_free(private);
1614
1615 strlcat(identity_file, ".pub", sizeof(identity_file));
1616 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0)
1617 fatal_r(r, "Unable to save public key to %s", identity_file);
1618 sshkey_free(public);
1619 free(comment);
1620
1621 if (strlen(new_comment) > 0)
1622 printf("Comment '%s' applied\n", new_comment);
1623 else
1624 printf("Comment removed\n");
1625
1626 exit(0);
1627 }
1628
1629 static void
cert_ext_add(const char * key,const char * value,int iscrit)1630 cert_ext_add(const char *key, const char *value, int iscrit)
1631 {
1632 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext));
1633 cert_ext[ncert_ext].key = xstrdup(key);
1634 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value);
1635 cert_ext[ncert_ext].crit = iscrit;
1636 ncert_ext++;
1637 }
1638
1639 /* qsort(3) comparison function for certificate extensions */
1640 static int
cert_ext_cmp(const void * _a,const void * _b)1641 cert_ext_cmp(const void *_a, const void *_b)
1642 {
1643 const struct cert_ext *a = (const struct cert_ext *)_a;
1644 const struct cert_ext *b = (const struct cert_ext *)_b;
1645 int r;
1646
1647 if (a->crit != b->crit)
1648 return (a->crit < b->crit) ? -1 : 1;
1649 if ((r = strcmp(a->key, b->key)) != 0)
1650 return r;
1651 if ((a->val == NULL) != (b->val == NULL))
1652 return (a->val == NULL) ? -1 : 1;
1653 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0)
1654 return r;
1655 return 0;
1656 }
1657
1658 #define OPTIONS_CRITICAL 1
1659 #define OPTIONS_EXTENSIONS 2
1660 static void
prepare_options_buf(struct sshbuf * c,int which)1661 prepare_options_buf(struct sshbuf *c, int which)
1662 {
1663 struct sshbuf *b;
1664 size_t i;
1665 int r;
1666 const struct cert_ext *ext;
1667
1668 if ((b = sshbuf_new()) == NULL)
1669 fatal_f("sshbuf_new failed");
1670 sshbuf_reset(c);
1671 for (i = 0; i < ncert_ext; i++) {
1672 ext = &cert_ext[i];
1673 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) ||
1674 (!ext->crit && (which & OPTIONS_CRITICAL)))
1675 continue;
1676 if (ext->val == NULL) {
1677 /* flag option */
1678 debug3_f("%s", ext->key);
1679 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1680 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1681 fatal_fr(r, "prepare flag");
1682 } else {
1683 /* key/value option */
1684 debug3_f("%s=%s", ext->key, ext->val);
1685 sshbuf_reset(b);
1686 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1687 (r = sshbuf_put_cstring(b, ext->val)) != 0 ||
1688 (r = sshbuf_put_stringb(c, b)) != 0)
1689 fatal_fr(r, "prepare k/v");
1690 }
1691 }
1692 sshbuf_free(b);
1693 }
1694
1695 static void
finalise_cert_exts(void)1696 finalise_cert_exts(void)
1697 {
1698 /* critical options */
1699 if (certflags_command != NULL)
1700 cert_ext_add("force-command", certflags_command, 1);
1701 if (certflags_src_addr != NULL)
1702 cert_ext_add("source-address", certflags_src_addr, 1);
1703 if ((certflags_flags & CERTOPT_REQUIRE_VERIFY) != 0)
1704 cert_ext_add("verify-required", NULL, 1);
1705 /* extensions */
1706 if ((certflags_flags & CERTOPT_X_FWD) != 0)
1707 cert_ext_add("permit-X11-forwarding", NULL, 0);
1708 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0)
1709 cert_ext_add("permit-agent-forwarding", NULL, 0);
1710 if ((certflags_flags & CERTOPT_PORT_FWD) != 0)
1711 cert_ext_add("permit-port-forwarding", NULL, 0);
1712 if ((certflags_flags & CERTOPT_PTY) != 0)
1713 cert_ext_add("permit-pty", NULL, 0);
1714 if ((certflags_flags & CERTOPT_USER_RC) != 0)
1715 cert_ext_add("permit-user-rc", NULL, 0);
1716 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0)
1717 cert_ext_add("no-touch-required", NULL, 0);
1718 /* order lexically by key */
1719 if (ncert_ext > 0)
1720 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp);
1721 }
1722
1723 static struct sshkey *
load_pkcs11_key(char * path)1724 load_pkcs11_key(char *path)
1725 {
1726 #ifdef ENABLE_PKCS11
1727 struct sshkey **keys = NULL, *public, *private = NULL;
1728 int r, i, nkeys;
1729
1730 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1731 fatal_r(r, "Couldn't load CA public key \"%s\"", path);
1732
1733 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase,
1734 &keys, NULL);
1735 debug3_f("%d keys", nkeys);
1736 if (nkeys <= 0)
1737 fatal("cannot read public key from pkcs11");
1738 for (i = 0; i < nkeys; i++) {
1739 if (sshkey_equal_public(public, keys[i])) {
1740 private = keys[i];
1741 continue;
1742 }
1743 sshkey_free(keys[i]);
1744 }
1745 free(keys);
1746 sshkey_free(public);
1747 return private;
1748 #else
1749 fatal("no pkcs11 support");
1750 #endif /* ENABLE_PKCS11 */
1751 }
1752
1753 /* Signer for sshkey_certify_custom that uses the agent */
1754 static int
agent_signer(struct sshkey * key,u_char ** sigp,size_t * lenp,const u_char * data,size_t datalen,const char * alg,const char * provider,const char * pin,u_int compat,void * ctx)1755 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp,
1756 const u_char *data, size_t datalen,
1757 const char *alg, const char *provider, const char *pin,
1758 u_int compat, void *ctx)
1759 {
1760 int *agent_fdp = (int *)ctx;
1761
1762 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1763 data, datalen, alg, compat);
1764 }
1765
1766 static void
do_ca_sign(struct passwd * pw,const char * ca_key_path,int prefer_agent,unsigned long long cert_serial,int cert_serial_autoinc,int argc,char ** argv)1767 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent,
1768 unsigned long long cert_serial, int cert_serial_autoinc,
1769 int argc, char **argv)
1770 {
1771 int r, i, found, agent_fd = -1;
1772 u_int n;
1773 struct sshkey *ca, *public;
1774 char valid[64], *otmp, *tmp, *cp, *out, *comment;
1775 char *ca_fp = NULL, **plist = NULL, *pin = NULL;
1776 struct ssh_identitylist *agent_ids;
1777 size_t j;
1778 struct notifier_ctx *notifier = NULL;
1779
1780 #ifdef ENABLE_PKCS11
1781 pkcs11_init(1);
1782 #endif
1783 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1784 if (pkcs11provider != NULL) {
1785 /* If a PKCS#11 token was specified then try to use it */
1786 if ((ca = load_pkcs11_key(tmp)) == NULL)
1787 fatal("No PKCS#11 key matching %s found", ca_key_path);
1788 } else if (prefer_agent) {
1789 /*
1790 * Agent signature requested. Try to use agent after making
1791 * sure the public key specified is actually present in the
1792 * agent.
1793 */
1794 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1795 fatal_r(r, "Cannot load CA public key %s", tmp);
1796 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1797 fatal_r(r, "Cannot use public key for CA signature");
1798 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1799 fatal_r(r, "Retrieve agent key list");
1800 found = 0;
1801 for (j = 0; j < agent_ids->nkeys; j++) {
1802 if (sshkey_equal(ca, agent_ids->keys[j])) {
1803 found = 1;
1804 break;
1805 }
1806 }
1807 if (!found)
1808 fatal("CA key %s not found in agent", tmp);
1809 ssh_free_identitylist(agent_ids);
1810 ca->flags |= SSHKEY_FLAG_EXT;
1811 } else {
1812 /* CA key is assumed to be a private key on the filesystem */
1813 ca = load_identity(tmp, NULL);
1814 if (sshkey_is_sk(ca) &&
1815 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
1816 if ((pin = read_passphrase("Enter PIN for CA key: ",
1817 RP_ALLOW_STDIN)) == NULL)
1818 fatal_f("couldn't read PIN");
1819 }
1820 }
1821 free(tmp);
1822
1823 if (key_type_name != NULL) {
1824 if (sshkey_type_from_name(key_type_name) != ca->type) {
1825 fatal("CA key type %s doesn't match specified %s",
1826 sshkey_ssh_name(ca), key_type_name);
1827 }
1828 } else if (ca->type == KEY_RSA) {
1829 /* Default to a good signature algorithm */
1830 key_type_name = "rsa-sha2-512";
1831 }
1832 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT);
1833
1834 finalise_cert_exts();
1835 for (i = 0; i < argc; i++) {
1836 /* Split list of principals */
1837 n = 0;
1838 if (cert_principals != NULL) {
1839 otmp = tmp = xstrdup(cert_principals);
1840 plist = NULL;
1841 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1842 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1843 if (*(plist[n] = xstrdup(cp)) == '\0')
1844 fatal("Empty principal name");
1845 }
1846 free(otmp);
1847 }
1848 if (n > SSHKEY_CERT_MAX_PRINCIPALS)
1849 fatal("Too many certificate principals specified");
1850
1851 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1852 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1853 fatal_r(r, "load pubkey \"%s\"", tmp);
1854 if (sshkey_is_cert(public))
1855 fatal_f("key \"%s\" type %s cannot be certified",
1856 tmp, sshkey_type(public));
1857
1858 /* Prepare certificate to sign */
1859 if ((r = sshkey_to_certified(public)) != 0)
1860 fatal_r(r, "Could not upgrade key %s to certificate", tmp);
1861 public->cert->type = cert_key_type;
1862 public->cert->serial = (u_int64_t)cert_serial;
1863 public->cert->key_id = xstrdup(cert_key_id);
1864 public->cert->nprincipals = n;
1865 public->cert->principals = plist;
1866 public->cert->valid_after = cert_valid_from;
1867 public->cert->valid_before = cert_valid_to;
1868 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1869 prepare_options_buf(public->cert->extensions,
1870 OPTIONS_EXTENSIONS);
1871 if ((r = sshkey_from_private(ca,
1872 &public->cert->signature_key)) != 0)
1873 fatal_r(r, "sshkey_from_private (ca key)");
1874
1875 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1876 if ((r = sshkey_certify_custom(public, ca,
1877 key_type_name, sk_provider, NULL, agent_signer,
1878 &agent_fd)) != 0)
1879 fatal_r(r, "Couldn't certify %s via agent", tmp);
1880 } else {
1881 if (sshkey_is_sk(ca) &&
1882 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
1883 notifier = notify_start(0,
1884 "Confirm user presence for key %s %s",
1885 sshkey_type(ca), ca_fp);
1886 }
1887 r = sshkey_certify(public, ca, key_type_name,
1888 sk_provider, pin);
1889 notify_complete(notifier, "User presence confirmed");
1890 if (r != 0)
1891 fatal_r(r, "Couldn't certify key %s", tmp);
1892 }
1893
1894 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1895 *cp = '\0';
1896 xasprintf(&out, "%s-cert.pub", tmp);
1897 free(tmp);
1898
1899 if ((r = sshkey_save_public(public, out, comment)) != 0) {
1900 fatal_r(r, "Unable to save public key to %s",
1901 identity_file);
1902 }
1903
1904 if (!quiet) {
1905 sshkey_format_cert_validity(public->cert,
1906 valid, sizeof(valid));
1907 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1908 "valid %s", sshkey_cert_type(public),
1909 out, public->cert->key_id,
1910 (unsigned long long)public->cert->serial,
1911 cert_principals != NULL ? " for " : "",
1912 cert_principals != NULL ? cert_principals : "",
1913 valid);
1914 }
1915
1916 sshkey_free(public);
1917 free(out);
1918 if (cert_serial_autoinc)
1919 cert_serial++;
1920 }
1921 if (pin != NULL)
1922 freezero(pin, strlen(pin));
1923 free(ca_fp);
1924 #ifdef ENABLE_PKCS11
1925 pkcs11_terminate();
1926 #endif
1927 exit(0);
1928 }
1929
1930 static u_int64_t
parse_relative_time(const char * s,time_t now)1931 parse_relative_time(const char *s, time_t now)
1932 {
1933 int64_t mul, secs;
1934
1935 mul = *s == '-' ? -1 : 1;
1936
1937 if ((secs = convtime(s + 1)) == -1)
1938 fatal("Invalid relative certificate time %s", s);
1939 if (mul == -1 && secs > now)
1940 fatal("Certificate time %s cannot be represented", s);
1941 return now + (u_int64_t)(secs * mul);
1942 }
1943
1944 static void
parse_hex_u64(const char * s,uint64_t * up)1945 parse_hex_u64(const char *s, uint64_t *up)
1946 {
1947 char *ep;
1948 unsigned long long ull;
1949
1950 errno = 0;
1951 ull = strtoull(s, &ep, 16);
1952 if (*s == '\0' || *ep != '\0')
1953 fatal("Invalid certificate time: not a number");
1954 if (errno == ERANGE && ull == ULONG_MAX)
1955 fatal_fr(SSH_ERR_SYSTEM_ERROR, "Invalid certificate time");
1956 *up = (uint64_t)ull;
1957 }
1958
1959 static void
parse_cert_times(char * timespec)1960 parse_cert_times(char *timespec)
1961 {
1962 char *from, *to;
1963 time_t now = time(NULL);
1964 int64_t secs;
1965
1966 /* +timespec relative to now */
1967 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1968 if ((secs = convtime(timespec + 1)) == -1)
1969 fatal("Invalid relative certificate life %s", timespec);
1970 cert_valid_to = now + secs;
1971 /*
1972 * Backdate certificate one minute to avoid problems on hosts
1973 * with poorly-synchronised clocks.
1974 */
1975 cert_valid_from = ((now - 59)/ 60) * 60;
1976 return;
1977 }
1978
1979 /*
1980 * from:to, where
1981 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "always"
1982 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "forever"
1983 */
1984 from = xstrdup(timespec);
1985 to = strchr(from, ':');
1986 if (to == NULL || from == to || *(to + 1) == '\0')
1987 fatal("Invalid certificate life specification %s", timespec);
1988 *to++ = '\0';
1989
1990 if (*from == '-' || *from == '+')
1991 cert_valid_from = parse_relative_time(from, now);
1992 else if (strcmp(from, "always") == 0)
1993 cert_valid_from = 0;
1994 else if (strncmp(from, "0x", 2) == 0)
1995 parse_hex_u64(from, &cert_valid_from);
1996 else if (parse_absolute_time(from, &cert_valid_from) != 0)
1997 fatal("Invalid from time \"%s\"", from);
1998
1999 if (*to == '-' || *to == '+')
2000 cert_valid_to = parse_relative_time(to, now);
2001 else if (strcmp(to, "forever") == 0)
2002 cert_valid_to = ~(u_int64_t)0;
2003 else if (strncmp(to, "0x", 2) == 0)
2004 parse_hex_u64(to, &cert_valid_to);
2005 else if (parse_absolute_time(to, &cert_valid_to) != 0)
2006 fatal("Invalid to time \"%s\"", to);
2007
2008 if (cert_valid_to <= cert_valid_from)
2009 fatal("Empty certificate validity interval");
2010 free(from);
2011 }
2012
2013 static void
add_cert_option(char * opt)2014 add_cert_option(char *opt)
2015 {
2016 char *val, *cp;
2017 int iscrit = 0;
2018
2019 if (strcasecmp(opt, "clear") == 0)
2020 certflags_flags = 0;
2021 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
2022 certflags_flags &= ~CERTOPT_X_FWD;
2023 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
2024 certflags_flags |= CERTOPT_X_FWD;
2025 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
2026 certflags_flags &= ~CERTOPT_AGENT_FWD;
2027 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
2028 certflags_flags |= CERTOPT_AGENT_FWD;
2029 else if (strcasecmp(opt, "no-port-forwarding") == 0)
2030 certflags_flags &= ~CERTOPT_PORT_FWD;
2031 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
2032 certflags_flags |= CERTOPT_PORT_FWD;
2033 else if (strcasecmp(opt, "no-pty") == 0)
2034 certflags_flags &= ~CERTOPT_PTY;
2035 else if (strcasecmp(opt, "permit-pty") == 0)
2036 certflags_flags |= CERTOPT_PTY;
2037 else if (strcasecmp(opt, "no-user-rc") == 0)
2038 certflags_flags &= ~CERTOPT_USER_RC;
2039 else if (strcasecmp(opt, "permit-user-rc") == 0)
2040 certflags_flags |= CERTOPT_USER_RC;
2041 else if (strcasecmp(opt, "touch-required") == 0)
2042 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE;
2043 else if (strcasecmp(opt, "no-touch-required") == 0)
2044 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE;
2045 else if (strcasecmp(opt, "no-verify-required") == 0)
2046 certflags_flags &= ~CERTOPT_REQUIRE_VERIFY;
2047 else if (strcasecmp(opt, "verify-required") == 0)
2048 certflags_flags |= CERTOPT_REQUIRE_VERIFY;
2049 else if (strncasecmp(opt, "force-command=", 14) == 0) {
2050 val = opt + 14;
2051 if (*val == '\0')
2052 fatal("Empty force-command option");
2053 if (certflags_command != NULL)
2054 fatal("force-command already specified");
2055 certflags_command = xstrdup(val);
2056 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
2057 val = opt + 15;
2058 if (*val == '\0')
2059 fatal("Empty source-address option");
2060 if (certflags_src_addr != NULL)
2061 fatal("source-address already specified");
2062 if (addr_match_cidr_list(NULL, val) != 0)
2063 fatal("Invalid source-address list");
2064 certflags_src_addr = xstrdup(val);
2065 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
2066 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
2067 val = xstrdup(strchr(opt, ':') + 1);
2068 if ((cp = strchr(val, '=')) != NULL)
2069 *cp++ = '\0';
2070 cert_ext_add(val, cp, iscrit);
2071 free(val);
2072 } else
2073 fatal("Unsupported certificate option \"%s\"", opt);
2074 }
2075
2076 static void
show_options(struct sshbuf * optbuf,int in_critical)2077 show_options(struct sshbuf *optbuf, int in_critical)
2078 {
2079 char *name, *arg, *hex;
2080 struct sshbuf *options, *option = NULL;
2081 int r;
2082
2083 if ((options = sshbuf_fromb(optbuf)) == NULL)
2084 fatal_f("sshbuf_fromb failed");
2085 while (sshbuf_len(options) != 0) {
2086 sshbuf_free(option);
2087 option = NULL;
2088 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
2089 (r = sshbuf_froms(options, &option)) != 0)
2090 fatal_fr(r, "parse option");
2091 printf(" %s", name);
2092 if (!in_critical &&
2093 (strcmp(name, "permit-X11-forwarding") == 0 ||
2094 strcmp(name, "permit-agent-forwarding") == 0 ||
2095 strcmp(name, "permit-port-forwarding") == 0 ||
2096 strcmp(name, "permit-pty") == 0 ||
2097 strcmp(name, "permit-user-rc") == 0 ||
2098 strcmp(name, "no-touch-required") == 0)) {
2099 printf("\n");
2100 } else if (in_critical &&
2101 (strcmp(name, "force-command") == 0 ||
2102 strcmp(name, "source-address") == 0)) {
2103 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
2104 fatal_fr(r, "parse critical");
2105 printf(" %s\n", arg);
2106 free(arg);
2107 } else if (in_critical &&
2108 strcmp(name, "verify-required") == 0) {
2109 printf("\n");
2110 } else if (sshbuf_len(option) > 0) {
2111 hex = sshbuf_dtob16(option);
2112 printf(" UNKNOWN OPTION: %s (len %zu)\n",
2113 hex, sshbuf_len(option));
2114 sshbuf_reset(option);
2115 free(hex);
2116 } else
2117 printf(" UNKNOWN FLAG OPTION\n");
2118 free(name);
2119 if (sshbuf_len(option) != 0)
2120 fatal("Option corrupt: extra data at end");
2121 }
2122 sshbuf_free(option);
2123 sshbuf_free(options);
2124 }
2125
2126 static void
print_cert(struct sshkey * key)2127 print_cert(struct sshkey *key)
2128 {
2129 char valid[64], *key_fp, *ca_fp;
2130 u_int i;
2131
2132 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2133 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2134 fingerprint_hash, SSH_FP_DEFAULT);
2135 if (key_fp == NULL || ca_fp == NULL)
2136 fatal_f("sshkey_fingerprint fail");
2137 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2138
2139 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2140 sshkey_cert_type(key));
2141 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2142 printf(" Signing CA: %s %s (using %s)\n",
2143 sshkey_type(key->cert->signature_key), ca_fp,
2144 key->cert->signature_type);
2145 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2146 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2147 printf(" Valid: %s\n", valid);
2148 printf(" Principals: ");
2149 if (key->cert->nprincipals == 0)
2150 printf("(none)\n");
2151 else {
2152 for (i = 0; i < key->cert->nprincipals; i++)
2153 printf("\n %s",
2154 key->cert->principals[i]);
2155 printf("\n");
2156 }
2157 printf(" Critical Options: ");
2158 if (sshbuf_len(key->cert->critical) == 0)
2159 printf("(none)\n");
2160 else {
2161 printf("\n");
2162 show_options(key->cert->critical, 1);
2163 }
2164 printf(" Extensions: ");
2165 if (sshbuf_len(key->cert->extensions) == 0)
2166 printf("(none)\n");
2167 else {
2168 printf("\n");
2169 show_options(key->cert->extensions, 0);
2170 }
2171 }
2172
2173 static void
do_show_cert(struct passwd * pw)2174 do_show_cert(struct passwd *pw)
2175 {
2176 struct sshkey *key = NULL;
2177 struct stat st;
2178 int r, is_stdin = 0, ok = 0;
2179 FILE *f;
2180 char *cp, *line = NULL;
2181 const char *path;
2182 size_t linesize = 0;
2183 u_long lnum = 0;
2184
2185 if (!have_identity)
2186 ask_filename(pw, "Enter file in which the key is");
2187 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1)
2188 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2189
2190 path = identity_file;
2191 if (strcmp(path, "-") == 0) {
2192 f = stdin;
2193 path = "(stdin)";
2194 is_stdin = 1;
2195 } else if ((f = fopen(identity_file, "r")) == NULL)
2196 fatal("fopen %s: %s", identity_file, strerror(errno));
2197
2198 while (getline(&line, &linesize, f) != -1) {
2199 lnum++;
2200 sshkey_free(key);
2201 key = NULL;
2202 /* Trim leading space and comments */
2203 cp = line + strspn(line, " \t");
2204 if (*cp == '#' || *cp == '\0')
2205 continue;
2206 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2207 fatal("sshkey_new");
2208 if ((r = sshkey_read(key, &cp)) != 0) {
2209 error_r(r, "%s:%lu: invalid key", path, lnum);
2210 continue;
2211 }
2212 if (!sshkey_is_cert(key)) {
2213 error("%s:%lu is not a certificate", path, lnum);
2214 continue;
2215 }
2216 ok = 1;
2217 if (!is_stdin && lnum == 1)
2218 printf("%s:\n", path);
2219 else
2220 printf("%s:%lu:\n", path, lnum);
2221 print_cert(key);
2222 }
2223 free(line);
2224 sshkey_free(key);
2225 fclose(f);
2226 exit(ok ? 0 : 1);
2227 }
2228
2229 static void
load_krl(const char * path,struct ssh_krl ** krlp)2230 load_krl(const char *path, struct ssh_krl **krlp)
2231 {
2232 struct sshbuf *krlbuf;
2233 int r;
2234
2235 if ((r = sshbuf_load_file(path, &krlbuf)) != 0)
2236 fatal_r(r, "Unable to load KRL %s", path);
2237 /* XXX check sigs */
2238 if ((r = ssh_krl_from_blob(krlbuf, krlp)) != 0 ||
2239 *krlp == NULL)
2240 fatal_r(r, "Invalid KRL file %s", path);
2241 sshbuf_free(krlbuf);
2242 }
2243
2244 static void
hash_to_blob(const char * cp,u_char ** blobp,size_t * lenp,const char * file,u_long lnum)2245 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp,
2246 const char *file, u_long lnum)
2247 {
2248 char *tmp;
2249 size_t tlen;
2250 struct sshbuf *b;
2251 int r;
2252
2253 if (strncmp(cp, "SHA256:", 7) != 0)
2254 fatal("%s:%lu: unsupported hash algorithm", file, lnum);
2255 cp += 7;
2256
2257 /*
2258 * OpenSSH base64 hashes omit trailing '='
2259 * characters; put them back for decode.
2260 */
2261 if ((tlen = strlen(cp)) >= SIZE_MAX - 5)
2262 fatal_f("hash too long: %zu bytes", tlen);
2263 tmp = xmalloc(tlen + 4 + 1);
2264 strlcpy(tmp, cp, tlen + 1);
2265 while ((tlen % 4) != 0) {
2266 tmp[tlen++] = '=';
2267 tmp[tlen] = '\0';
2268 }
2269 if ((b = sshbuf_new()) == NULL)
2270 fatal_f("sshbuf_new failed");
2271 if ((r = sshbuf_b64tod(b, tmp)) != 0)
2272 fatal_r(r, "%s:%lu: decode hash failed", file, lnum);
2273 free(tmp);
2274 *lenp = sshbuf_len(b);
2275 *blobp = xmalloc(*lenp);
2276 memcpy(*blobp, sshbuf_ptr(b), *lenp);
2277 sshbuf_free(b);
2278 }
2279
2280 static void
update_krl_from_file(struct passwd * pw,const char * file,int wild_ca,const struct sshkey * ca,struct ssh_krl * krl)2281 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2282 const struct sshkey *ca, struct ssh_krl *krl)
2283 {
2284 struct sshkey *key = NULL;
2285 u_long lnum = 0;
2286 char *path, *cp, *ep, *line = NULL;
2287 u_char *blob = NULL;
2288 size_t blen = 0, linesize = 0;
2289 unsigned long long serial, serial2;
2290 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r;
2291 FILE *krl_spec;
2292
2293 path = tilde_expand_filename(file, pw->pw_uid);
2294 if (strcmp(path, "-") == 0) {
2295 krl_spec = stdin;
2296 free(path);
2297 path = xstrdup("(standard input)");
2298 } else if ((krl_spec = fopen(path, "r")) == NULL)
2299 fatal("fopen %s: %s", path, strerror(errno));
2300
2301 if (!quiet)
2302 printf("Revoking from %s\n", path);
2303 while (getline(&line, &linesize, krl_spec) != -1) {
2304 if (linesize >= INT_MAX) {
2305 fatal_f("%s contains unparsable line, len=%zu",
2306 path, linesize);
2307 }
2308 lnum++;
2309 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0;
2310 cp = line + strspn(line, " \t");
2311 /* Trim trailing space, comments and strip \n */
2312 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2313 if (cp[i] == '#' || cp[i] == '\n') {
2314 cp[i] = '\0';
2315 break;
2316 }
2317 if (cp[i] == ' ' || cp[i] == '\t') {
2318 /* Remember the start of a span of whitespace */
2319 if (r == -1)
2320 r = i;
2321 } else
2322 r = -1;
2323 }
2324 if (r != -1)
2325 cp[r] = '\0';
2326 if (*cp == '\0')
2327 continue;
2328 if (strncasecmp(cp, "serial:", 7) == 0) {
2329 if (ca == NULL && !wild_ca) {
2330 fatal("revoking certificates by serial number "
2331 "requires specification of a CA key");
2332 }
2333 cp += 7;
2334 cp = cp + strspn(cp, " \t");
2335 errno = 0;
2336 serial = strtoull(cp, &ep, 0);
2337 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2338 fatal("%s:%lu: invalid serial \"%s\"",
2339 path, lnum, cp);
2340 if (errno == ERANGE && serial == ULLONG_MAX)
2341 fatal("%s:%lu: serial out of range",
2342 path, lnum);
2343 serial2 = serial;
2344 if (*ep == '-') {
2345 cp = ep + 1;
2346 errno = 0;
2347 serial2 = strtoull(cp, &ep, 0);
2348 if (*cp == '\0' || *ep != '\0')
2349 fatal("%s:%lu: invalid serial \"%s\"",
2350 path, lnum, cp);
2351 if (errno == ERANGE && serial2 == ULLONG_MAX)
2352 fatal("%s:%lu: serial out of range",
2353 path, lnum);
2354 if (serial2 <= serial)
2355 fatal("%s:%lu: invalid serial range "
2356 "%llu:%llu", path, lnum,
2357 (unsigned long long)serial,
2358 (unsigned long long)serial2);
2359 }
2360 if (ssh_krl_revoke_cert_by_serial_range(krl,
2361 ca, serial, serial2) != 0) {
2362 fatal_f("revoke serial failed");
2363 }
2364 } else if (strncasecmp(cp, "id:", 3) == 0) {
2365 if (ca == NULL && !wild_ca) {
2366 fatal("revoking certificates by key ID "
2367 "requires specification of a CA key");
2368 }
2369 cp += 3;
2370 cp = cp + strspn(cp, " \t");
2371 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2372 fatal_f("revoke key ID failed");
2373 } else if (strncasecmp(cp, "hash:", 5) == 0) {
2374 cp += 5;
2375 cp = cp + strspn(cp, " \t");
2376 hash_to_blob(cp, &blob, &blen, file, lnum);
2377 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2378 if (r != 0)
2379 fatal_fr(r, "revoke key failed");
2380 } else {
2381 if (strncasecmp(cp, "key:", 4) == 0) {
2382 cp += 4;
2383 cp = cp + strspn(cp, " \t");
2384 was_explicit_key = 1;
2385 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2386 cp += 5;
2387 cp = cp + strspn(cp, " \t");
2388 was_sha1 = 1;
2389 } else if (strncasecmp(cp, "sha256:", 7) == 0) {
2390 cp += 7;
2391 cp = cp + strspn(cp, " \t");
2392 was_sha256 = 1;
2393 /*
2394 * Just try to process the line as a key.
2395 * Parsing will fail if it isn't.
2396 */
2397 }
2398 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2399 fatal("sshkey_new");
2400 if ((r = sshkey_read(key, &cp)) != 0)
2401 fatal_r(r, "%s:%lu: invalid key", path, lnum);
2402 if (was_explicit_key)
2403 r = ssh_krl_revoke_key_explicit(krl, key);
2404 else if (was_sha1) {
2405 if (sshkey_fingerprint_raw(key,
2406 SSH_DIGEST_SHA1, &blob, &blen) != 0) {
2407 fatal("%s:%lu: fingerprint failed",
2408 file, lnum);
2409 }
2410 r = ssh_krl_revoke_key_sha1(krl, blob, blen);
2411 } else if (was_sha256) {
2412 if (sshkey_fingerprint_raw(key,
2413 SSH_DIGEST_SHA256, &blob, &blen) != 0) {
2414 fatal("%s:%lu: fingerprint failed",
2415 file, lnum);
2416 }
2417 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2418 } else
2419 r = ssh_krl_revoke_key(krl, key);
2420 if (r != 0)
2421 fatal_fr(r, "revoke key failed");
2422 freezero(blob, blen);
2423 blob = NULL;
2424 blen = 0;
2425 sshkey_free(key);
2426 }
2427 }
2428 if (strcmp(path, "-") != 0)
2429 fclose(krl_spec);
2430 free(line);
2431 free(path);
2432 }
2433
2434 static void
do_gen_krl(struct passwd * pw,int updating,const char * ca_key_path,unsigned long long krl_version,const char * krl_comment,int argc,char ** argv)2435 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path,
2436 unsigned long long krl_version, const char *krl_comment,
2437 int argc, char **argv)
2438 {
2439 struct ssh_krl *krl;
2440 struct stat sb;
2441 struct sshkey *ca = NULL;
2442 int i, r, wild_ca = 0;
2443 char *tmp;
2444 struct sshbuf *kbuf;
2445
2446 if (*identity_file == '\0')
2447 fatal("KRL generation requires an output file");
2448 if (stat(identity_file, &sb) == -1) {
2449 if (errno != ENOENT)
2450 fatal("Cannot access KRL \"%s\": %s",
2451 identity_file, strerror(errno));
2452 if (updating)
2453 fatal("KRL \"%s\" does not exist", identity_file);
2454 }
2455 if (ca_key_path != NULL) {
2456 if (strcasecmp(ca_key_path, "none") == 0)
2457 wild_ca = 1;
2458 else {
2459 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2460 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2461 fatal_r(r, "Cannot load CA public key %s", tmp);
2462 free(tmp);
2463 }
2464 }
2465
2466 if (updating)
2467 load_krl(identity_file, &krl);
2468 else if ((krl = ssh_krl_init()) == NULL)
2469 fatal("couldn't create KRL");
2470
2471 if (krl_version != 0)
2472 ssh_krl_set_version(krl, krl_version);
2473 if (krl_comment != NULL)
2474 ssh_krl_set_comment(krl, krl_comment);
2475
2476 for (i = 0; i < argc; i++)
2477 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2478
2479 if ((kbuf = sshbuf_new()) == NULL)
2480 fatal("sshbuf_new failed");
2481 if (ssh_krl_to_blob(krl, kbuf) != 0)
2482 fatal("Couldn't generate KRL");
2483 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0)
2484 fatal("write %s: %s", identity_file, strerror(errno));
2485 sshbuf_free(kbuf);
2486 ssh_krl_free(krl);
2487 sshkey_free(ca);
2488 }
2489
2490 static void
do_check_krl(struct passwd * pw,int print_krl,int argc,char ** argv)2491 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv)
2492 {
2493 int i, r, ret = 0;
2494 char *comment;
2495 struct ssh_krl *krl;
2496 struct sshkey *k;
2497
2498 if (*identity_file == '\0')
2499 fatal("KRL checking requires an input file");
2500 load_krl(identity_file, &krl);
2501 if (print_krl)
2502 krl_dump(krl, stdout);
2503 for (i = 0; i < argc; i++) {
2504 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2505 fatal_r(r, "Cannot load public key %s", argv[i]);
2506 r = ssh_krl_check_key(krl, k);
2507 printf("%s%s%s%s: %s\n", argv[i],
2508 *comment ? " (" : "", comment, *comment ? ")" : "",
2509 r == 0 ? "ok" : "REVOKED");
2510 if (r != 0)
2511 ret = 1;
2512 sshkey_free(k);
2513 free(comment);
2514 }
2515 ssh_krl_free(krl);
2516 exit(ret);
2517 }
2518
2519 static struct sshkey *
load_sign_key(const char * keypath,const struct sshkey * pubkey)2520 load_sign_key(const char *keypath, const struct sshkey *pubkey)
2521 {
2522 size_t i, slen, plen = strlen(keypath);
2523 char *privpath = xstrdup(keypath);
2524 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL };
2525 struct sshkey *ret = NULL, *privkey = NULL;
2526 int r, waspub = 0;
2527 struct stat st;
2528
2529 /*
2530 * If passed a public key filename, then try to locate the corresponding
2531 * private key. This lets us specify certificates on the command-line
2532 * and have ssh-keygen find the appropriate private key.
2533 */
2534 for (i = 0; suffixes[i]; i++) {
2535 slen = strlen(suffixes[i]);
2536 if (plen <= slen ||
2537 strcmp(privpath + plen - slen, suffixes[i]) != 0)
2538 continue;
2539 privpath[plen - slen] = '\0';
2540 debug_f("%s looks like a public key, using private key "
2541 "path %s instead", keypath, privpath);
2542 waspub = 1;
2543 }
2544 if (waspub && stat(privpath, &st) != 0 && errno == ENOENT)
2545 fatal("No private key found for public key \"%s\"", keypath);
2546 if ((r = sshkey_load_private(privpath, "", &privkey, NULL)) != 0 &&
2547 (r != SSH_ERR_KEY_WRONG_PASSPHRASE)) {
2548 debug_fr(r, "load private key \"%s\"", privpath);
2549 fatal("No private key found for \"%s\"", privpath);
2550 } else if (privkey == NULL)
2551 privkey = load_identity(privpath, NULL);
2552
2553 if (!sshkey_equal_public(pubkey, privkey)) {
2554 error("Public key %s doesn't match private %s",
2555 keypath, privpath);
2556 goto done;
2557 }
2558 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) {
2559 /*
2560 * Graft the certificate onto the private key to make
2561 * it capable of signing.
2562 */
2563 if ((r = sshkey_to_certified(privkey)) != 0) {
2564 error_fr(r, "sshkey_to_certified");
2565 goto done;
2566 }
2567 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) {
2568 error_fr(r, "sshkey_cert_copy");
2569 goto done;
2570 }
2571 }
2572 /* success */
2573 ret = privkey;
2574 privkey = NULL;
2575 done:
2576 sshkey_free(privkey);
2577 free(privpath);
2578 return ret;
2579 }
2580
2581 static int
sign_one(struct sshkey * signkey,const char * filename,int fd,const char * sig_namespace,const char * hashalg,sshsig_signer * signer,void * signer_ctx)2582 sign_one(struct sshkey *signkey, const char *filename, int fd,
2583 const char *sig_namespace, const char *hashalg, sshsig_signer *signer,
2584 void *signer_ctx)
2585 {
2586 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2587 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno;
2588 char *wfile = NULL, *asig = NULL, *fp = NULL;
2589 char *pin = NULL, *prompt = NULL;
2590
2591 if (!quiet) {
2592 if (fd == STDIN_FILENO)
2593 fprintf(stderr, "Signing data on standard input\n");
2594 else
2595 fprintf(stderr, "Signing file %s\n", filename);
2596 }
2597 if (signer == NULL && sshkey_is_sk(signkey)) {
2598 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
2599 xasprintf(&prompt, "Enter PIN for %s key: ",
2600 sshkey_type(signkey));
2601 if ((pin = read_passphrase(prompt,
2602 RP_ALLOW_STDIN)) == NULL)
2603 fatal_f("couldn't read PIN");
2604 }
2605 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
2606 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash,
2607 SSH_FP_DEFAULT)) == NULL)
2608 fatal_f("fingerprint failed");
2609 fprintf(stderr, "Confirm user presence for key %s %s\n",
2610 sshkey_type(signkey), fp);
2611 free(fp);
2612 }
2613 }
2614 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin,
2615 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) {
2616 error_r(r, "Signing %s failed", filename);
2617 goto out;
2618 }
2619 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) {
2620 error_fr(r, "sshsig_armor");
2621 goto out;
2622 }
2623 if ((asig = sshbuf_dup_string(abuf)) == NULL) {
2624 error_f("buffer error");
2625 r = SSH_ERR_ALLOC_FAIL;
2626 goto out;
2627 }
2628
2629 if (fd == STDIN_FILENO) {
2630 fputs(asig, stdout);
2631 fflush(stdout);
2632 } else {
2633 xasprintf(&wfile, "%s.sig", filename);
2634 if (confirm_overwrite(wfile)) {
2635 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC,
2636 0666)) == -1) {
2637 oerrno = errno;
2638 error("Cannot open %s: %s",
2639 wfile, strerror(errno));
2640 errno = oerrno;
2641 r = SSH_ERR_SYSTEM_ERROR;
2642 goto out;
2643 }
2644 if (atomicio(vwrite, wfd, asig,
2645 strlen(asig)) != strlen(asig)) {
2646 oerrno = errno;
2647 error("Cannot write to %s: %s",
2648 wfile, strerror(errno));
2649 errno = oerrno;
2650 r = SSH_ERR_SYSTEM_ERROR;
2651 goto out;
2652 }
2653 if (!quiet) {
2654 fprintf(stderr, "Write signature to %s\n",
2655 wfile);
2656 }
2657 }
2658 }
2659 /* success */
2660 r = 0;
2661 out:
2662 free(wfile);
2663 free(prompt);
2664 free(asig);
2665 if (pin != NULL)
2666 freezero(pin, strlen(pin));
2667 sshbuf_free(abuf);
2668 sshbuf_free(sigbuf);
2669 if (wfd != -1)
2670 close(wfd);
2671 return r;
2672 }
2673
2674 static int
sig_process_opts(char * const * opts,size_t nopts,char ** hashalgp,uint64_t * verify_timep,int * print_pubkey)2675 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp,
2676 uint64_t *verify_timep, int *print_pubkey)
2677 {
2678 size_t i;
2679 time_t now;
2680
2681 if (verify_timep != NULL)
2682 *verify_timep = 0;
2683 if (print_pubkey != NULL)
2684 *print_pubkey = 0;
2685 if (hashalgp != NULL)
2686 *hashalgp = NULL;
2687 for (i = 0; i < nopts; i++) {
2688 if (hashalgp != NULL &&
2689 strncasecmp(opts[i], "hashalg=", 8) == 0) {
2690 *hashalgp = xstrdup(opts[i] + 8);
2691 } else if (verify_timep &&
2692 strncasecmp(opts[i], "verify-time=", 12) == 0) {
2693 if (parse_absolute_time(opts[i] + 12,
2694 verify_timep) != 0 || *verify_timep == 0) {
2695 error("Invalid \"verify-time\" option");
2696 return SSH_ERR_INVALID_ARGUMENT;
2697 }
2698 } else if (print_pubkey &&
2699 strcasecmp(opts[i], "print-pubkey") == 0) {
2700 *print_pubkey = 1;
2701 } else {
2702 error("Invalid option \"%s\"", opts[i]);
2703 return SSH_ERR_INVALID_ARGUMENT;
2704 }
2705 }
2706 if (verify_timep && *verify_timep == 0) {
2707 if ((now = time(NULL)) < 0) {
2708 error("Time is before epoch");
2709 return SSH_ERR_INVALID_ARGUMENT;
2710 }
2711 *verify_timep = (uint64_t)now;
2712 }
2713 return 0;
2714 }
2715
2716
2717 static int
sig_sign(const char * keypath,const char * sig_namespace,int require_agent,int argc,char ** argv,char * const * opts,size_t nopts)2718 sig_sign(const char *keypath, const char *sig_namespace, int require_agent,
2719 int argc, char **argv, char * const *opts, size_t nopts)
2720 {
2721 int i, fd = -1, r, ret = -1;
2722 int agent_fd = -1;
2723 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL;
2724 sshsig_signer *signer = NULL;
2725 char *hashalg = NULL;
2726
2727 /* Check file arguments. */
2728 for (i = 0; i < argc; i++) {
2729 if (strcmp(argv[i], "-") != 0)
2730 continue;
2731 if (i > 0 || argc > 1)
2732 fatal("Cannot sign mix of paths and standard input");
2733 }
2734
2735 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0)
2736 goto done; /* error already logged */
2737
2738 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) {
2739 error_r(r, "Couldn't load public key %s", keypath);
2740 goto done;
2741 }
2742
2743 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
2744 if (require_agent)
2745 fatal("Couldn't get agent socket");
2746 debug_r(r, "Couldn't get agent socket");
2747 } else {
2748 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0)
2749 signer = agent_signer;
2750 else {
2751 if (require_agent)
2752 fatal("Couldn't find key in agent");
2753 debug_r(r, "Couldn't find key in agent");
2754 }
2755 }
2756
2757 if (signer == NULL) {
2758 /* Not using agent - try to load private key */
2759 if ((privkey = load_sign_key(keypath, pubkey)) == NULL)
2760 goto done;
2761 signkey = privkey;
2762 } else {
2763 /* Will use key in agent */
2764 signkey = pubkey;
2765 }
2766
2767 if (argc == 0) {
2768 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO,
2769 sig_namespace, hashalg, signer, &agent_fd)) != 0)
2770 goto done;
2771 } else {
2772 for (i = 0; i < argc; i++) {
2773 if (strcmp(argv[i], "-") == 0)
2774 fd = STDIN_FILENO;
2775 else if ((fd = open(argv[i], O_RDONLY)) == -1) {
2776 error("Cannot open %s for signing: %s",
2777 argv[i], strerror(errno));
2778 goto done;
2779 }
2780 if ((r = sign_one(signkey, argv[i], fd, sig_namespace,
2781 hashalg, signer, &agent_fd)) != 0)
2782 goto done;
2783 if (fd != STDIN_FILENO)
2784 close(fd);
2785 fd = -1;
2786 }
2787 }
2788
2789 ret = 0;
2790 done:
2791 if (fd != -1 && fd != STDIN_FILENO)
2792 close(fd);
2793 sshkey_free(pubkey);
2794 sshkey_free(privkey);
2795 free(hashalg);
2796 return ret;
2797 }
2798
2799 static int
sig_verify(const char * signature,const char * sig_namespace,const char * principal,const char * allowed_keys,const char * revoked_keys,char * const * opts,size_t nopts)2800 sig_verify(const char *signature, const char *sig_namespace,
2801 const char *principal, const char *allowed_keys, const char *revoked_keys,
2802 char * const *opts, size_t nopts)
2803 {
2804 int r, ret = -1;
2805 int print_pubkey = 0;
2806 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2807 struct sshkey *sign_key = NULL;
2808 char *fp = NULL;
2809 struct sshkey_sig_details *sig_details = NULL;
2810 uint64_t verify_time = 0;
2811
2812 if (sig_process_opts(opts, nopts, NULL, &verify_time,
2813 &print_pubkey) != 0)
2814 goto done; /* error already logged */
2815
2816 memset(&sig_details, 0, sizeof(sig_details));
2817 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2818 error_r(r, "Couldn't read signature file");
2819 goto done;
2820 }
2821
2822 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2823 error_fr(r, "sshsig_armor");
2824 goto done;
2825 }
2826 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace,
2827 &sign_key, &sig_details)) != 0)
2828 goto done; /* sshsig_verify() prints error */
2829
2830 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2831 SSH_FP_DEFAULT)) == NULL)
2832 fatal_f("sshkey_fingerprint failed");
2833 debug("Valid (unverified) signature from key %s", fp);
2834 if (sig_details != NULL) {
2835 debug2_f("signature details: counter = %u, flags = 0x%02x",
2836 sig_details->sk_counter, sig_details->sk_flags);
2837 }
2838 free(fp);
2839 fp = NULL;
2840
2841 if (revoked_keys != NULL) {
2842 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
2843 debug3_fr(r, "sshkey_check_revoked");
2844 goto done;
2845 }
2846 }
2847
2848 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys,
2849 sign_key, principal, sig_namespace, verify_time)) != 0) {
2850 debug3_fr(r, "sshsig_check_allowed_keys");
2851 goto done;
2852 }
2853 /* success */
2854 ret = 0;
2855 done:
2856 if (!quiet) {
2857 if (ret == 0) {
2858 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2859 SSH_FP_DEFAULT)) == NULL)
2860 fatal_f("sshkey_fingerprint failed");
2861 if (principal == NULL) {
2862 printf("Good \"%s\" signature with %s key %s\n",
2863 sig_namespace, sshkey_type(sign_key), fp);
2864
2865 } else {
2866 printf("Good \"%s\" signature for %s with %s key %s\n",
2867 sig_namespace, principal,
2868 sshkey_type(sign_key), fp);
2869 }
2870 } else {
2871 printf("Could not verify signature.\n");
2872 }
2873 }
2874 /* Print the signature key if requested */
2875 if (ret == 0 && print_pubkey && sign_key != NULL) {
2876 if ((r = sshkey_write(sign_key, stdout)) == 0)
2877 fputc('\n', stdout);
2878 else {
2879 error_r(r, "Could not print public key.\n");
2880 ret = -1;
2881 }
2882 }
2883 sshbuf_free(sigbuf);
2884 sshbuf_free(abuf);
2885 sshkey_free(sign_key);
2886 sshkey_sig_details_free(sig_details);
2887 free(fp);
2888 return ret;
2889 }
2890
2891 static int
sig_find_principals(const char * signature,const char * allowed_keys,char * const * opts,size_t nopts)2892 sig_find_principals(const char *signature, const char *allowed_keys,
2893 char * const *opts, size_t nopts)
2894 {
2895 int r, ret = -1;
2896 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2897 struct sshkey *sign_key = NULL;
2898 char *principals = NULL, *cp, *tmp;
2899 uint64_t verify_time = 0;
2900
2901 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0)
2902 goto done; /* error already logged */
2903
2904 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2905 error_r(r, "Couldn't read signature file");
2906 goto done;
2907 }
2908 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2909 error_fr(r, "sshsig_armor");
2910 goto done;
2911 }
2912 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) {
2913 error_fr(r, "sshsig_get_pubkey");
2914 goto done;
2915 }
2916 if ((r = sshsig_find_principals(allowed_keys, sign_key,
2917 verify_time, &principals)) != 0) {
2918 if (r != SSH_ERR_KEY_NOT_FOUND)
2919 error_fr(r, "sshsig_find_principal");
2920 goto done;
2921 }
2922 ret = 0;
2923 done:
2924 if (ret == 0 ) {
2925 /* Emit matching principals one per line */
2926 tmp = principals;
2927 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0')
2928 puts(cp);
2929 } else {
2930 fprintf(stderr, "No principal matched.\n");
2931 }
2932 sshbuf_free(sigbuf);
2933 sshbuf_free(abuf);
2934 sshkey_free(sign_key);
2935 free(principals);
2936 return ret;
2937 }
2938
2939 static int
sig_match_principals(const char * allowed_keys,char * principal,char * const * opts,size_t nopts)2940 sig_match_principals(const char *allowed_keys, char *principal,
2941 char * const *opts, size_t nopts)
2942 {
2943 int r;
2944 char **principals = NULL;
2945 size_t i, nprincipals = 0;
2946
2947 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0)
2948 return r; /* error already logged */
2949
2950 if ((r = sshsig_match_principals(allowed_keys, principal,
2951 &principals, &nprincipals)) != 0) {
2952 debug_f("match: %s", ssh_err(r));
2953 fprintf(stderr, "No principal matched.\n");
2954 return r;
2955 }
2956 for (i = 0; i < nprincipals; i++) {
2957 printf("%s\n", principals[i]);
2958 free(principals[i]);
2959 }
2960 free(principals);
2961
2962 return 0;
2963 }
2964
2965 static void
do_moduli_gen(const char * out_file,char ** opts,size_t nopts)2966 do_moduli_gen(const char *out_file, char **opts, size_t nopts)
2967 {
2968 #ifdef WITH_OPENSSL
2969 /* Moduli generation/screening */
2970 u_int32_t memory = 0;
2971 BIGNUM *start = NULL;
2972 int moduli_bits = 0;
2973 FILE *out;
2974 size_t i;
2975 const char *errstr;
2976
2977 /* Parse options */
2978 for (i = 0; i < nopts; i++) {
2979 if (strncmp(opts[i], "memory=", 7) == 0) {
2980 memory = (u_int32_t)strtonum(opts[i]+7, 1,
2981 UINT_MAX, &errstr);
2982 if (errstr) {
2983 fatal("Memory limit is %s: %s",
2984 errstr, opts[i]+7);
2985 }
2986 } else if (strncmp(opts[i], "start=", 6) == 0) {
2987 /* XXX - also compare length against bits */
2988 if (BN_hex2bn(&start, opts[i]+6) == 0)
2989 fatal("Invalid start point.");
2990 } else if (strncmp(opts[i], "bits=", 5) == 0) {
2991 moduli_bits = (int)strtonum(opts[i]+5, 1,
2992 INT_MAX, &errstr);
2993 if (errstr) {
2994 fatal("Invalid number: %s (%s)",
2995 opts[i]+12, errstr);
2996 }
2997 } else {
2998 fatal("Option \"%s\" is unsupported for moduli "
2999 "generation", opts[i]);
3000 }
3001 }
3002
3003 if ((out = fopen(out_file, "w")) == NULL) {
3004 fatal("Couldn't open modulus candidate file \"%s\": %s",
3005 out_file, strerror(errno));
3006 }
3007 setvbuf(out, NULL, _IOLBF, 0);
3008
3009 if (moduli_bits == 0)
3010 moduli_bits = DEFAULT_BITS;
3011 if (gen_candidates(out, memory, moduli_bits, start) != 0)
3012 fatal("modulus candidate generation failed");
3013 #else /* WITH_OPENSSL */
3014 fatal("Moduli generation is not supported");
3015 #endif /* WITH_OPENSSL */
3016 }
3017
3018 static void
do_moduli_screen(const char * out_file,char ** opts,size_t nopts)3019 do_moduli_screen(const char *out_file, char **opts, size_t nopts)
3020 {
3021 #ifdef WITH_OPENSSL
3022 /* Moduli generation/screening */
3023 char *checkpoint = NULL;
3024 u_int32_t generator_wanted = 0;
3025 unsigned long start_lineno = 0, lines_to_process = 0;
3026 int prime_tests = 0;
3027 FILE *out, *in = stdin;
3028 size_t i;
3029 const char *errstr;
3030
3031 /* Parse options */
3032 for (i = 0; i < nopts; i++) {
3033 if (strncmp(opts[i], "lines=", 6) == 0) {
3034 lines_to_process = strtoul(opts[i]+6, NULL, 10);
3035 } else if (strncmp(opts[i], "start-line=", 11) == 0) {
3036 start_lineno = strtoul(opts[i]+11, NULL, 10);
3037 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) {
3038 free(checkpoint);
3039 checkpoint = xstrdup(opts[i]+11);
3040 } else if (strncmp(opts[i], "generator=", 10) == 0) {
3041 generator_wanted = (u_int32_t)strtonum(
3042 opts[i]+10, 1, UINT_MAX, &errstr);
3043 if (errstr != NULL) {
3044 fatal("Generator invalid: %s (%s)",
3045 opts[i]+10, errstr);
3046 }
3047 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) {
3048 prime_tests = (int)strtonum(opts[i]+12, 1,
3049 INT_MAX, &errstr);
3050 if (errstr) {
3051 fatal("Invalid number: %s (%s)",
3052 opts[i]+12, errstr);
3053 }
3054 } else {
3055 fatal("Option \"%s\" is unsupported for moduli "
3056 "screening", opts[i]);
3057 }
3058 }
3059
3060 if (have_identity && strcmp(identity_file, "-") != 0) {
3061 if ((in = fopen(identity_file, "r")) == NULL) {
3062 fatal("Couldn't open modulus candidate "
3063 "file \"%s\": %s", identity_file,
3064 strerror(errno));
3065 }
3066 }
3067
3068 if ((out = fopen(out_file, "a")) == NULL) {
3069 fatal("Couldn't open moduli file \"%s\": %s",
3070 out_file, strerror(errno));
3071 }
3072 setvbuf(out, NULL, _IOLBF, 0);
3073 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests,
3074 generator_wanted, checkpoint,
3075 start_lineno, lines_to_process) != 0)
3076 fatal("modulus screening failed");
3077 if (in != stdin)
3078 (void)fclose(in);
3079 free(checkpoint);
3080 #else /* WITH_OPENSSL */
3081 fatal("Moduli screening is not supported");
3082 #endif /* WITH_OPENSSL */
3083 }
3084
3085 /* Read and confirm a passphrase */
3086 static char *
read_check_passphrase(const char * prompt1,const char * prompt2,const char * retry_prompt)3087 read_check_passphrase(const char *prompt1, const char *prompt2,
3088 const char *retry_prompt)
3089 {
3090 char *passphrase1, *passphrase2;
3091
3092 for (;;) {
3093 passphrase1 = read_passphrase(prompt1, RP_ALLOW_STDIN);
3094 passphrase2 = read_passphrase(prompt2, RP_ALLOW_STDIN);
3095 if (strcmp(passphrase1, passphrase2) == 0) {
3096 freezero(passphrase2, strlen(passphrase2));
3097 return passphrase1;
3098 }
3099 /* The passphrases do not match. Clear them and retry. */
3100 freezero(passphrase1, strlen(passphrase1));
3101 freezero(passphrase2, strlen(passphrase2));
3102 fputs(retry_prompt, stdout);
3103 fputc('\n', stdout);
3104 fflush(stdout);
3105 }
3106 /* NOTREACHED */
3107 return NULL;
3108 }
3109
3110 static char *
private_key_passphrase(void)3111 private_key_passphrase(void)
3112 {
3113 if (identity_passphrase)
3114 return xstrdup(identity_passphrase);
3115 if (identity_new_passphrase)
3116 return xstrdup(identity_new_passphrase);
3117
3118 return read_check_passphrase(
3119 "Enter passphrase (empty for no passphrase): ",
3120 "Enter same passphrase again: ",
3121 "Passphrases do not match. Try again.");
3122 }
3123
3124 static char *
sk_suffix(const char * application,const uint8_t * user,size_t userlen)3125 sk_suffix(const char *application, const uint8_t *user, size_t userlen)
3126 {
3127 char *ret, *cp;
3128 size_t slen, i;
3129
3130 /* Trim off URL-like preamble */
3131 if (strncmp(application, "ssh://", 6) == 0)
3132 ret = xstrdup(application + 6);
3133 else if (strncmp(application, "ssh:", 4) == 0)
3134 ret = xstrdup(application + 4);
3135 else
3136 ret = xstrdup(application);
3137
3138 /* Count trailing zeros in user */
3139 for (i = 0; i < userlen; i++) {
3140 if (user[userlen - i - 1] != 0)
3141 break;
3142 }
3143 if (i >= userlen)
3144 return ret; /* user-id was default all-zeros */
3145
3146 /* Append user-id, escaping non-UTF-8 characters */
3147 slen = userlen - i;
3148 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1)
3149 fatal_f("asmprintf failed");
3150 /* Don't emit a user-id that contains path or control characters */
3151 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL ||
3152 strchr(cp, '\\') != NULL) {
3153 free(cp);
3154 cp = tohex(user, slen);
3155 }
3156 xextendf(&ret, "_", "%s", cp);
3157 free(cp);
3158 return ret;
3159 }
3160
3161 static int
do_download_sk(const char * skprovider,const char * device)3162 do_download_sk(const char *skprovider, const char *device)
3163 {
3164 struct sshsk_resident_key **srks;
3165 size_t nsrks, i;
3166 int r, ret = -1;
3167 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath;
3168 const char *ext;
3169 struct sshkey *key;
3170
3171 if (skprovider == NULL)
3172 fatal("Cannot download keys without provider");
3173
3174 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN);
3175 if (!quiet) {
3176 printf("You may need to touch your authenticator "
3177 "to authorize key download.\n");
3178 }
3179 if ((r = sshsk_load_resident(skprovider, device, pin, 0,
3180 &srks, &nsrks)) != 0) {
3181 if (pin != NULL)
3182 freezero(pin, strlen(pin));
3183 error_r(r, "Unable to load resident keys");
3184 return -1;
3185 }
3186 if (nsrks == 0)
3187 logit("No keys to download");
3188 if (pin != NULL)
3189 freezero(pin, strlen(pin));
3190
3191 for (i = 0; i < nsrks; i++) {
3192 key = srks[i]->key;
3193 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) {
3194 error("Unsupported key type %s (%d)",
3195 sshkey_type(key), key->type);
3196 continue;
3197 }
3198 if ((fp = sshkey_fingerprint(key, fingerprint_hash,
3199 SSH_FP_DEFAULT)) == NULL)
3200 fatal_f("sshkey_fingerprint failed");
3201 debug_f("key %zu: %s %s %s (flags 0x%02x)", i,
3202 sshkey_type(key), fp, key->sk_application, key->sk_flags);
3203 ext = sk_suffix(key->sk_application,
3204 srks[i]->user_id, srks[i]->user_id_len);
3205 xasprintf(&path, "id_%s_rk%s%s",
3206 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk",
3207 *ext == '\0' ? "" : "_", ext);
3208
3209 /* If the file already exists, ask the user to confirm. */
3210 if (!confirm_overwrite(path)) {
3211 free(path);
3212 break;
3213 }
3214
3215 /* Save the key with the application string as the comment */
3216 if (pass == NULL)
3217 pass = private_key_passphrase();
3218 if ((r = sshkey_save_private(key, path, pass,
3219 key->sk_application, private_key_format,
3220 openssh_format_cipher, rounds)) != 0) {
3221 error_r(r, "Saving key \"%s\" failed", path);
3222 free(path);
3223 break;
3224 }
3225 if (!quiet) {
3226 printf("Saved %s key%s%s to %s\n", sshkey_type(key),
3227 *ext != '\0' ? " " : "",
3228 *ext != '\0' ? key->sk_application : "",
3229 path);
3230 }
3231
3232 /* Save public key too */
3233 xasprintf(&pubpath, "%s.pub", path);
3234 free(path);
3235 if ((r = sshkey_save_public(key, pubpath,
3236 key->sk_application)) != 0) {
3237 error_r(r, "Saving public key \"%s\" failed", pubpath);
3238 free(pubpath);
3239 break;
3240 }
3241 free(pubpath);
3242 }
3243
3244 if (i >= nsrks)
3245 ret = 0; /* success */
3246 if (pass != NULL)
3247 freezero(pass, strlen(pass));
3248 sshsk_free_resident_keys(srks, nsrks);
3249 return ret;
3250 }
3251
3252 static void
save_attestation(struct sshbuf * attest,const char * path)3253 save_attestation(struct sshbuf *attest, const char *path)
3254 {
3255 mode_t omask;
3256 int r;
3257
3258 if (path == NULL)
3259 return; /* nothing to do */
3260 if (attest == NULL || sshbuf_len(attest) == 0)
3261 fatal("Enrollment did not return attestation data");
3262 omask = umask(077);
3263 r = sshbuf_write_file(path, attest);
3264 umask(omask);
3265 if (r != 0)
3266 fatal_r(r, "Unable to write attestation data \"%s\"", path);
3267 if (!quiet)
3268 printf("Your FIDO attestation certificate has been saved in "
3269 "%s\n", path);
3270 }
3271
3272 static int
confirm_sk_overwrite(const char * application,const char * user)3273 confirm_sk_overwrite(const char *application, const char *user)
3274 {
3275 char yesno[3];
3276
3277 printf("A resident key scoped to '%s' with user id '%s' already "
3278 "exists.\n", application == NULL ? "ssh:" : application,
3279 user == NULL ? "null" : user);
3280 printf("Overwrite key in token (y/n)? ");
3281 fflush(stdout);
3282 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
3283 return 0;
3284 if (yesno[0] != 'y' && yesno[0] != 'Y')
3285 return 0;
3286 return 1;
3287 }
3288
3289 static void
usage(void)3290 usage(void)
3291 {
3292 fprintf(stderr,
3293 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n"
3294 " [-m format] [-N new_passphrase] [-O option]\n"
3295 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n"
3296 " [-w provider] [-Z cipher]\n"
3297 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n"
3298 " [-P old_passphrase] [-Z cipher]\n"
3299 #ifdef WITH_OPENSSL
3300 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n"
3301 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n"
3302 #endif
3303 " ssh-keygen -y [-f input_keyfile]\n"
3304 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n"
3305 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
3306 " ssh-keygen -B [-f input_keyfile]\n");
3307 #ifdef ENABLE_PKCS11
3308 fprintf(stderr,
3309 " ssh-keygen -D pkcs11\n");
3310 #endif
3311 fprintf(stderr,
3312 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n"
3313 " ssh-keygen -H [-f known_hosts_file]\n"
3314 " ssh-keygen -K [-a rounds] [-w provider]\n"
3315 " ssh-keygen -R hostname [-f known_hosts_file]\n"
3316 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n"
3317 #ifdef WITH_OPENSSL
3318 " ssh-keygen -M generate [-O option] output_file\n"
3319 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n"
3320 #endif
3321 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n"
3322 " [-n principals] [-O option] [-V validity_interval]\n"
3323 " [-z serial_number] file ...\n"
3324 " ssh-keygen -L [-f input_keyfile]\n"
3325 " ssh-keygen -A [-a rounds] [-f prefix_path]\n"
3326 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
3327 " file ...\n"
3328 " ssh-keygen -Q [-l] -f krl_file [file ...]\n"
3329 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n"
3330 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n"
3331 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n"
3332 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n"
3333 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n"
3334 " -n namespace -s signature_file [-r krl_file] [-O option]\n");
3335 exit(1);
3336 }
3337
3338 /*
3339 * Main program for key management.
3340 */
3341 int
main(int argc,char ** argv)3342 main(int argc, char **argv)
3343 {
3344 char comment[1024], *passphrase = NULL;
3345 char *rr_hostname = NULL, *ep, *fp, *ra;
3346 struct sshkey *private, *public;
3347 struct passwd *pw;
3348 int r, opt, type;
3349 int change_passphrase = 0, change_comment = 0, show_cert = 0;
3350 int find_host = 0, delete_host = 0, hash_hosts = 0;
3351 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
3352 int prefer_agent = 0, convert_to = 0, convert_from = 0;
3353 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0;
3354 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0;
3355 unsigned long long cert_serial = 0;
3356 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL;
3357 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL;
3358 char *sk_attestation_path = NULL;
3359 struct sshbuf *challenge = NULL, *attest = NULL;
3360 size_t i, nopts = 0;
3361 u_int32_t bits = 0;
3362 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD;
3363 const char *errstr;
3364 int log_level = SYSLOG_LEVEL_INFO;
3365 char *sign_op = NULL;
3366
3367 extern int optind;
3368 extern char *optarg;
3369
3370 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
3371 sanitise_stdfd();
3372
3373 __progname = ssh_get_progname(argv[0]);
3374
3375 seed_rng();
3376
3377 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
3378
3379 msetlocale();
3380
3381 /* we need this for the home * directory. */
3382 pw = getpwuid(getuid());
3383 if (!pw)
3384 fatal("No user exists for uid %lu", (u_long)getuid());
3385 pw = pwcopy(pw);
3386 if (gethostname(hostname, sizeof(hostname)) == -1)
3387 fatal("gethostname: %s", strerror(errno));
3388
3389 sk_provider = getenv("SSH_SK_PROVIDER");
3390
3391 /* Remaining characters: dGjJSTWx */
3392 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy"
3393 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:"
3394 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) {
3395 switch (opt) {
3396 case 'A':
3397 gen_all_hostkeys = 1;
3398 break;
3399 case 'b':
3400 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX,
3401 &errstr);
3402 if (errstr)
3403 fatal("Bits has bad value %s (%s)",
3404 optarg, errstr);
3405 break;
3406 case 'E':
3407 fingerprint_hash = ssh_digest_alg_by_name(optarg);
3408 if (fingerprint_hash == -1)
3409 fatal("Invalid hash algorithm \"%s\"", optarg);
3410 break;
3411 case 'F':
3412 find_host = 1;
3413 rr_hostname = optarg;
3414 break;
3415 case 'H':
3416 hash_hosts = 1;
3417 break;
3418 case 'I':
3419 cert_key_id = optarg;
3420 break;
3421 case 'R':
3422 delete_host = 1;
3423 rr_hostname = optarg;
3424 break;
3425 case 'L':
3426 show_cert = 1;
3427 break;
3428 case 'l':
3429 print_fingerprint = 1;
3430 break;
3431 case 'B':
3432 print_bubblebabble = 1;
3433 break;
3434 case 'm':
3435 if (strcasecmp(optarg, "RFC4716") == 0 ||
3436 strcasecmp(optarg, "ssh2") == 0) {
3437 convert_format = FMT_RFC4716;
3438 break;
3439 }
3440 if (strcasecmp(optarg, "PKCS8") == 0) {
3441 convert_format = FMT_PKCS8;
3442 private_key_format = SSHKEY_PRIVATE_PKCS8;
3443 break;
3444 }
3445 if (strcasecmp(optarg, "PEM") == 0) {
3446 convert_format = FMT_PEM;
3447 private_key_format = SSHKEY_PRIVATE_PEM;
3448 break;
3449 }
3450 fatal("Unsupported conversion format \"%s\"", optarg);
3451 case 'n':
3452 cert_principals = optarg;
3453 break;
3454 case 'o':
3455 /* no-op; new format is already the default */
3456 break;
3457 case 'p':
3458 change_passphrase = 1;
3459 break;
3460 case 'c':
3461 change_comment = 1;
3462 break;
3463 case 'f':
3464 if (strlcpy(identity_file, optarg,
3465 sizeof(identity_file)) >= sizeof(identity_file))
3466 fatal("Identity filename too long");
3467 have_identity = 1;
3468 break;
3469 case 'g':
3470 print_generic = 1;
3471 break;
3472 case 'K':
3473 download_sk = 1;
3474 break;
3475 case 'P':
3476 identity_passphrase = optarg;
3477 break;
3478 case 'N':
3479 identity_new_passphrase = optarg;
3480 break;
3481 case 'Q':
3482 check_krl = 1;
3483 break;
3484 case 'O':
3485 opts = xrecallocarray(opts, nopts, nopts + 1,
3486 sizeof(*opts));
3487 opts[nopts++] = xstrdup(optarg);
3488 break;
3489 case 'Z':
3490 openssh_format_cipher = optarg;
3491 if (cipher_by_name(openssh_format_cipher) == NULL)
3492 fatal("Invalid OpenSSH-format cipher '%s'",
3493 openssh_format_cipher);
3494 break;
3495 case 'C':
3496 identity_comment = optarg;
3497 break;
3498 case 'q':
3499 quiet = 1;
3500 break;
3501 case 'e':
3502 /* export key */
3503 convert_to = 1;
3504 break;
3505 case 'h':
3506 cert_key_type = SSH2_CERT_TYPE_HOST;
3507 certflags_flags = 0;
3508 break;
3509 case 'k':
3510 gen_krl = 1;
3511 break;
3512 case 'i':
3513 case 'X':
3514 /* import key */
3515 convert_from = 1;
3516 break;
3517 case 'y':
3518 print_public = 1;
3519 break;
3520 case 's':
3521 ca_key_path = optarg;
3522 break;
3523 case 't':
3524 key_type_name = optarg;
3525 break;
3526 case 'D':
3527 pkcs11provider = optarg;
3528 break;
3529 case 'U':
3530 prefer_agent = 1;
3531 break;
3532 case 'u':
3533 update_krl = 1;
3534 break;
3535 case 'v':
3536 if (log_level == SYSLOG_LEVEL_INFO)
3537 log_level = SYSLOG_LEVEL_DEBUG1;
3538 else {
3539 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
3540 log_level < SYSLOG_LEVEL_DEBUG3)
3541 log_level++;
3542 }
3543 break;
3544 case 'r':
3545 rr_hostname = optarg;
3546 break;
3547 case 'a':
3548 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
3549 if (errstr)
3550 fatal("Invalid number: %s (%s)",
3551 optarg, errstr);
3552 break;
3553 case 'V':
3554 parse_cert_times(optarg);
3555 break;
3556 case 'Y':
3557 sign_op = optarg;
3558 break;
3559 case 'w':
3560 sk_provider = optarg;
3561 break;
3562 case 'z':
3563 errno = 0;
3564 if (*optarg == '+') {
3565 cert_serial_autoinc = 1;
3566 optarg++;
3567 }
3568 cert_serial = strtoull(optarg, &ep, 10);
3569 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
3570 (errno == ERANGE && cert_serial == ULLONG_MAX))
3571 fatal("Invalid serial number \"%s\"", optarg);
3572 break;
3573 case 'M':
3574 if (strcmp(optarg, "generate") == 0)
3575 do_gen_candidates = 1;
3576 else if (strcmp(optarg, "screen") == 0)
3577 do_screen_candidates = 1;
3578 else
3579 fatal("Unsupported moduli option %s", optarg);
3580 break;
3581 default:
3582 usage();
3583 }
3584 }
3585
3586 #ifdef ENABLE_SK_INTERNAL
3587 if (sk_provider == NULL)
3588 sk_provider = "internal";
3589 #endif
3590
3591 /* reinit */
3592 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
3593
3594 argv += optind;
3595 argc -= optind;
3596
3597 if (sign_op != NULL) {
3598 if (strncmp(sign_op, "find-principals", 15) == 0) {
3599 if (ca_key_path == NULL) {
3600 error("Too few arguments for find-principals:"
3601 "missing signature file");
3602 exit(1);
3603 }
3604 if (!have_identity) {
3605 error("Too few arguments for find-principals:"
3606 "missing allowed keys file");
3607 exit(1);
3608 }
3609 return sig_find_principals(ca_key_path, identity_file,
3610 opts, nopts);
3611 } else if (strncmp(sign_op, "match-principals", 16) == 0) {
3612 if (!have_identity) {
3613 error("Too few arguments for match-principals:"
3614 "missing allowed keys file");
3615 exit(1);
3616 }
3617 if (cert_key_id == NULL) {
3618 error("Too few arguments for match-principals: "
3619 "missing principal ID");
3620 exit(1);
3621 }
3622 return sig_match_principals(identity_file, cert_key_id,
3623 opts, nopts);
3624 } else if (strncmp(sign_op, "sign", 4) == 0) {
3625 /* NB. cert_principals is actually namespace, via -n */
3626 if (cert_principals == NULL ||
3627 *cert_principals == '\0') {
3628 error("Too few arguments for sign: "
3629 "missing namespace");
3630 exit(1);
3631 }
3632 if (!have_identity) {
3633 error("Too few arguments for sign: "
3634 "missing key");
3635 exit(1);
3636 }
3637 return sig_sign(identity_file, cert_principals,
3638 prefer_agent, argc, argv, opts, nopts);
3639 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) {
3640 /* NB. cert_principals is actually namespace, via -n */
3641 if (cert_principals == NULL ||
3642 *cert_principals == '\0') {
3643 error("Too few arguments for check-novalidate: "
3644 "missing namespace");
3645 exit(1);
3646 }
3647 if (ca_key_path == NULL) {
3648 error("Too few arguments for check-novalidate: "
3649 "missing signature file");
3650 exit(1);
3651 }
3652 return sig_verify(ca_key_path, cert_principals,
3653 NULL, NULL, NULL, opts, nopts);
3654 } else if (strncmp(sign_op, "verify", 6) == 0) {
3655 /* NB. cert_principals is actually namespace, via -n */
3656 if (cert_principals == NULL ||
3657 *cert_principals == '\0') {
3658 error("Too few arguments for verify: "
3659 "missing namespace");
3660 exit(1);
3661 }
3662 if (ca_key_path == NULL) {
3663 error("Too few arguments for verify: "
3664 "missing signature file");
3665 exit(1);
3666 }
3667 if (!have_identity) {
3668 error("Too few arguments for sign: "
3669 "missing allowed keys file");
3670 exit(1);
3671 }
3672 if (cert_key_id == NULL) {
3673 error("Too few arguments for verify: "
3674 "missing principal identity");
3675 exit(1);
3676 }
3677 return sig_verify(ca_key_path, cert_principals,
3678 cert_key_id, identity_file, rr_hostname,
3679 opts, nopts);
3680 }
3681 error("Unsupported operation for -Y: \"%s\"", sign_op);
3682 usage();
3683 /* NOTREACHED */
3684 }
3685
3686 if (ca_key_path != NULL) {
3687 if (argc < 1 && !gen_krl) {
3688 error("Too few arguments.");
3689 usage();
3690 }
3691 } else if (argc > 0 && !gen_krl && !check_krl &&
3692 !do_gen_candidates && !do_screen_candidates) {
3693 error("Too many arguments.");
3694 usage();
3695 }
3696 if (change_passphrase && change_comment) {
3697 error("Can only have one of -p and -c.");
3698 usage();
3699 }
3700 if (print_fingerprint && (delete_host || hash_hosts)) {
3701 error("Cannot use -l with -H or -R.");
3702 usage();
3703 }
3704 if (gen_krl) {
3705 do_gen_krl(pw, update_krl, ca_key_path,
3706 cert_serial, identity_comment, argc, argv);
3707 return (0);
3708 }
3709 if (check_krl) {
3710 do_check_krl(pw, print_fingerprint, argc, argv);
3711 return (0);
3712 }
3713 if (ca_key_path != NULL) {
3714 if (cert_key_id == NULL)
3715 fatal("Must specify key id (-I) when certifying");
3716 for (i = 0; i < nopts; i++)
3717 add_cert_option(opts[i]);
3718 do_ca_sign(pw, ca_key_path, prefer_agent,
3719 cert_serial, cert_serial_autoinc, argc, argv);
3720 }
3721 if (show_cert)
3722 do_show_cert(pw);
3723 if (delete_host || hash_hosts || find_host) {
3724 do_known_hosts(pw, rr_hostname, find_host,
3725 delete_host, hash_hosts);
3726 }
3727 if (pkcs11provider != NULL)
3728 do_download(pw);
3729 if (download_sk) {
3730 for (i = 0; i < nopts; i++) {
3731 if (strncasecmp(opts[i], "device=", 7) == 0) {
3732 sk_device = xstrdup(opts[i] + 7);
3733 } else {
3734 fatal("Option \"%s\" is unsupported for "
3735 "FIDO authenticator download", opts[i]);
3736 }
3737 }
3738 return do_download_sk(sk_provider, sk_device);
3739 }
3740 if (print_fingerprint || print_bubblebabble)
3741 do_fingerprint(pw);
3742 if (change_passphrase)
3743 do_change_passphrase(pw);
3744 if (change_comment)
3745 do_change_comment(pw, identity_comment);
3746 #ifdef WITH_OPENSSL
3747 if (convert_to)
3748 do_convert_to(pw);
3749 if (convert_from)
3750 do_convert_from(pw);
3751 #else /* WITH_OPENSSL */
3752 if (convert_to || convert_from)
3753 fatal("key conversion disabled at compile time");
3754 #endif /* WITH_OPENSSL */
3755 if (print_public)
3756 do_print_public(pw);
3757 if (rr_hostname != NULL) {
3758 unsigned int n = 0;
3759
3760 if (have_identity) {
3761 n = do_print_resource_record(pw, identity_file,
3762 rr_hostname, print_generic, opts, nopts);
3763 if (n == 0)
3764 fatal("%s: %s", identity_file, strerror(errno));
3765 exit(0);
3766 } else {
3767
3768 n += do_print_resource_record(pw,
3769 _PATH_HOST_RSA_KEY_FILE, rr_hostname,
3770 print_generic, opts, nopts);
3771 #ifdef WITH_DSA
3772 n += do_print_resource_record(pw,
3773 _PATH_HOST_DSA_KEY_FILE, rr_hostname,
3774 print_generic, opts, nopts);
3775 #endif
3776 n += do_print_resource_record(pw,
3777 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname,
3778 print_generic, opts, nopts);
3779 n += do_print_resource_record(pw,
3780 _PATH_HOST_ED25519_KEY_FILE, rr_hostname,
3781 print_generic, opts, nopts);
3782 n += do_print_resource_record(pw,
3783 _PATH_HOST_XMSS_KEY_FILE, rr_hostname,
3784 print_generic, opts, nopts);
3785 if (n == 0)
3786 fatal("no keys found.");
3787 exit(0);
3788 }
3789 }
3790
3791 if (do_gen_candidates || do_screen_candidates) {
3792 if (argc <= 0)
3793 fatal("No output file specified");
3794 else if (argc > 1)
3795 fatal("Too many output files specified");
3796 }
3797 if (do_gen_candidates) {
3798 do_moduli_gen(argv[0], opts, nopts);
3799 return 0;
3800 }
3801 if (do_screen_candidates) {
3802 do_moduli_screen(argv[0], opts, nopts);
3803 return 0;
3804 }
3805
3806 if (gen_all_hostkeys) {
3807 do_gen_all_hostkeys(pw);
3808 return (0);
3809 }
3810
3811 if (key_type_name == NULL)
3812 key_type_name = DEFAULT_KEY_TYPE_NAME;
3813
3814 type = sshkey_type_from_name(key_type_name);
3815 type_bits_valid(type, key_type_name, &bits);
3816
3817 if (!quiet)
3818 printf("Generating public/private %s key pair.\n",
3819 key_type_name);
3820 switch (type) {
3821 case KEY_ECDSA_SK:
3822 case KEY_ED25519_SK:
3823 for (i = 0; i < nopts; i++) {
3824 if (strcasecmp(opts[i], "no-touch-required") == 0) {
3825 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
3826 } else if (strcasecmp(opts[i], "verify-required") == 0) {
3827 sk_flags |= SSH_SK_USER_VERIFICATION_REQD;
3828 } else if (strcasecmp(opts[i], "resident") == 0) {
3829 sk_flags |= SSH_SK_RESIDENT_KEY;
3830 } else if (strncasecmp(opts[i], "device=", 7) == 0) {
3831 sk_device = xstrdup(opts[i] + 7);
3832 } else if (strncasecmp(opts[i], "user=", 5) == 0) {
3833 sk_user = xstrdup(opts[i] + 5);
3834 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) {
3835 if ((r = sshbuf_load_file(opts[i] + 10,
3836 &challenge)) != 0) {
3837 fatal_r(r, "Unable to load FIDO "
3838 "enrollment challenge \"%s\"",
3839 opts[i] + 10);
3840 }
3841 } else if (strncasecmp(opts[i],
3842 "write-attestation=", 18) == 0) {
3843 sk_attestation_path = opts[i] + 18;
3844 } else if (strncasecmp(opts[i],
3845 "application=", 12) == 0) {
3846 sk_application = xstrdup(opts[i] + 12);
3847 if (strncmp(sk_application, "ssh:", 4) != 0) {
3848 fatal("FIDO application string must "
3849 "begin with \"ssh:\"");
3850 }
3851 } else {
3852 fatal("Option \"%s\" is unsupported for "
3853 "FIDO authenticator enrollment", opts[i]);
3854 }
3855 }
3856 if ((attest = sshbuf_new()) == NULL)
3857 fatal("sshbuf_new failed");
3858 r = 0;
3859 for (i = 0 ;;) {
3860 if (!quiet) {
3861 printf("You may need to touch your "
3862 "authenticator%s to authorize key "
3863 "generation.\n",
3864 r == 0 ? "" : " again");
3865 }
3866 fflush(stdout);
3867 r = sshsk_enroll(type, sk_provider, sk_device,
3868 sk_application == NULL ? "ssh:" : sk_application,
3869 sk_user, sk_flags, passphrase, challenge,
3870 &private, attest);
3871 if (r == 0)
3872 break;
3873 if (r == SSH_ERR_KEY_BAD_PERMISSIONS &&
3874 (sk_flags & SSH_SK_RESIDENT_KEY) != 0 &&
3875 (sk_flags & SSH_SK_FORCE_OPERATION) == 0 &&
3876 confirm_sk_overwrite(sk_application, sk_user)) {
3877 sk_flags |= SSH_SK_FORCE_OPERATION;
3878 continue;
3879 }
3880 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
3881 fatal_r(r, "Key enrollment failed");
3882 else if (passphrase != NULL) {
3883 error("PIN incorrect");
3884 freezero(passphrase, strlen(passphrase));
3885 passphrase = NULL;
3886 }
3887 if (++i >= 3)
3888 fatal("Too many incorrect PINs");
3889 passphrase = read_passphrase("Enter PIN for "
3890 "authenticator: ", RP_ALLOW_STDIN);
3891 }
3892 if (passphrase != NULL) {
3893 freezero(passphrase, strlen(passphrase));
3894 passphrase = NULL;
3895 }
3896 break;
3897 default:
3898 if ((r = sshkey_generate(type, bits, &private)) != 0)
3899 fatal("sshkey_generate failed");
3900 break;
3901 }
3902 if ((r = sshkey_from_private(private, &public)) != 0)
3903 fatal_r(r, "sshkey_from_private");
3904
3905 if (!have_identity)
3906 ask_filename(pw, "Enter file in which to save the key");
3907
3908 /* Create ~/.ssh directory if it doesn't already exist. */
3909 hostfile_create_user_ssh_dir(identity_file, !quiet);
3910
3911 /* If the file already exists, ask the user to confirm. */
3912 if (!confirm_overwrite(identity_file))
3913 exit(1);
3914
3915 /* Determine the passphrase for the private key */
3916 passphrase = private_key_passphrase();
3917 if (identity_comment) {
3918 strlcpy(comment, identity_comment, sizeof(comment));
3919 } else {
3920 /* Create default comment field for the passphrase. */
3921 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
3922 }
3923
3924 /* Save the key with the given passphrase and comment. */
3925 if ((r = sshkey_save_private(private, identity_file, passphrase,
3926 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
3927 error_r(r, "Saving key \"%s\" failed", identity_file);
3928 freezero(passphrase, strlen(passphrase));
3929 exit(1);
3930 }
3931 freezero(passphrase, strlen(passphrase));
3932 sshkey_free(private);
3933
3934 if (!quiet) {
3935 printf("Your identification has been saved in %s\n",
3936 identity_file);
3937 }
3938
3939 strlcat(identity_file, ".pub", sizeof(identity_file));
3940 if ((r = sshkey_save_public(public, identity_file, comment)) != 0)
3941 fatal_r(r, "Unable to save public key to %s", identity_file);
3942
3943 if (!quiet) {
3944 fp = sshkey_fingerprint(public, fingerprint_hash,
3945 SSH_FP_DEFAULT);
3946 ra = sshkey_fingerprint(public, fingerprint_hash,
3947 SSH_FP_RANDOMART);
3948 if (fp == NULL || ra == NULL)
3949 fatal("sshkey_fingerprint failed");
3950 printf("Your public key has been saved in %s\n",
3951 identity_file);
3952 printf("The key fingerprint is:\n");
3953 printf("%s %s\n", fp, comment);
3954 printf("The key's randomart image is:\n");
3955 printf("%s\n", ra);
3956 free(ra);
3957 free(fp);
3958 }
3959
3960 if (sk_attestation_path != NULL)
3961 save_attestation(attest, sk_attestation_path);
3962
3963 sshbuf_free(attest);
3964 sshkey_free(public);
3965
3966 exit(0);
3967 }
3968