1 /* $OpenBSD: ssh-keygen.c,v 1.459 2022/08/11 01:56:51 djm Exp $ */
2 /*
3 * Author: Tatu Ylonen <ylo@cs.hut.fi>
4 * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
6 * Identity and host key generation and maintenance.
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15 #include "includes.h"
16
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <sys/stat.h>
20
21 #ifdef WITH_OPENSSL
22 #include <openssl/evp.h>
23 #include <openssl/pem.h>
24 #include "openbsd-compat/openssl-compat.h"
25 #endif
26
27 #ifdef HAVE_STDINT_H
28 # include <stdint.h>
29 #endif
30 #include <errno.h>
31 #include <fcntl.h>
32 #include <netdb.h>
33 #ifdef HAVE_PATHS_H
34 # include <paths.h>
35 #endif
36 #include <pwd.h>
37 #include <stdarg.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42 #include <limits.h>
43 #include <locale.h>
44 #include <time.h>
45
46 #include "xmalloc.h"
47 #include "sshkey.h"
48 #include "authfile.h"
49 #include "sshbuf.h"
50 #include "pathnames.h"
51 #include "log.h"
52 #include "misc.h"
53 #include "match.h"
54 #include "hostfile.h"
55 #include "dns.h"
56 #include "ssh.h"
57 #include "ssh2.h"
58 #include "ssherr.h"
59 #include "ssh-pkcs11.h"
60 #include "atomicio.h"
61 #include "krl.h"
62 #include "digest.h"
63 #include "utf8.h"
64 #include "authfd.h"
65 #include "sshsig.h"
66 #include "ssh-sk.h"
67 #include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */
68 #include "cipher.h"
69
70 #ifdef WITH_OPENSSL
71 # define DEFAULT_KEY_TYPE_NAME "rsa"
72 #else
73 # define DEFAULT_KEY_TYPE_NAME "ed25519"
74 #endif
75
76 /*
77 * Default number of bits in the RSA, DSA and ECDSA keys. These value can be
78 * overridden on the command line.
79 *
80 * These values, with the exception of DSA, provide security equivalent to at
81 * least 128 bits of security according to NIST Special Publication 800-57:
82 * Recommendation for Key Management Part 1 rev 4 section 5.6.1.
83 * For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
84 * which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
85 * SHA1 we limit the DSA key size 1k bits.
86 */
87 #define DEFAULT_BITS 3072
88 #define DEFAULT_BITS_DSA 1024
89 #define DEFAULT_BITS_ECDSA 256
90
91 static int quiet = 0;
92
93 /* Flag indicating that we just want to see the key fingerprint */
94 static int print_fingerprint = 0;
95 static int print_bubblebabble = 0;
96
97 /* Hash algorithm to use for fingerprints. */
98 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
99
100 /* The identity file name, given on the command line or entered by the user. */
101 static char identity_file[PATH_MAX];
102 static int have_identity = 0;
103
104 /* This is set to the passphrase if given on the command line. */
105 static char *identity_passphrase = NULL;
106
107 /* This is set to the new passphrase if given on the command line. */
108 static char *identity_new_passphrase = NULL;
109
110 /* Key type when certifying */
111 static u_int cert_key_type = SSH2_CERT_TYPE_USER;
112
113 /* "key ID" of signed key */
114 static char *cert_key_id = NULL;
115
116 /* Comma-separated list of principal names for certifying keys */
117 static char *cert_principals = NULL;
118
119 /* Validity period for certificates */
120 static u_int64_t cert_valid_from = 0;
121 static u_int64_t cert_valid_to = ~0ULL;
122
123 /* Certificate options */
124 #define CERTOPT_X_FWD (1)
125 #define CERTOPT_AGENT_FWD (1<<1)
126 #define CERTOPT_PORT_FWD (1<<2)
127 #define CERTOPT_PTY (1<<3)
128 #define CERTOPT_USER_RC (1<<4)
129 #define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5)
130 #define CERTOPT_REQUIRE_VERIFY (1<<6)
131 #define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
132 CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
133 static u_int32_t certflags_flags = CERTOPT_DEFAULT;
134 static char *certflags_command = NULL;
135 static char *certflags_src_addr = NULL;
136
137 /* Arbitrary extensions specified by user */
138 struct cert_ext {
139 char *key;
140 char *val;
141 int crit;
142 };
143 static struct cert_ext *cert_ext;
144 static size_t ncert_ext;
145
146 /* Conversion to/from various formats */
147 enum {
148 FMT_RFC4716,
149 FMT_PKCS8,
150 FMT_PEM
151 } convert_format = FMT_RFC4716;
152
153 static char *key_type_name = NULL;
154
155 /* Load key from this PKCS#11 provider */
156 static char *pkcs11provider = NULL;
157
158 /* FIDO/U2F provider to use */
159 static char *sk_provider = NULL;
160
161 /* Format for writing private keys */
162 static int private_key_format = SSHKEY_PRIVATE_OPENSSH;
163
164 /* Cipher for new-format private keys */
165 static char *openssh_format_cipher = NULL;
166
167 /* Number of KDF rounds to derive new format keys. */
168 static int rounds = 0;
169
170 /* argv0 */
171 extern char *__progname;
172
173 static char hostname[NI_MAXHOST];
174
175 #ifdef WITH_OPENSSL
176 /* moduli.c */
177 int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
178 int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
179 unsigned long);
180 #endif
181
182 static void
type_bits_valid(int type,const char * name,u_int32_t * bitsp)183 type_bits_valid(int type, const char *name, u_int32_t *bitsp)
184 {
185 if (type == KEY_UNSPEC)
186 fatal("unknown key type %s", key_type_name);
187 if (*bitsp == 0) {
188 #ifdef WITH_OPENSSL
189 int nid;
190
191 switch(type) {
192 case KEY_DSA:
193 *bitsp = DEFAULT_BITS_DSA;
194 break;
195 case KEY_ECDSA:
196 if (name != NULL &&
197 (nid = sshkey_ecdsa_nid_from_name(name)) > 0)
198 *bitsp = sshkey_curve_nid_to_bits(nid);
199 if (*bitsp == 0)
200 *bitsp = DEFAULT_BITS_ECDSA;
201 break;
202 case KEY_RSA:
203 *bitsp = DEFAULT_BITS;
204 break;
205 }
206 #endif
207 }
208 #ifdef WITH_OPENSSL
209 switch (type) {
210 case KEY_DSA:
211 if (*bitsp != 1024)
212 fatal("Invalid DSA key length: must be 1024 bits");
213 break;
214 case KEY_RSA:
215 if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
216 fatal("Invalid RSA key length: minimum is %d bits",
217 SSH_RSA_MINIMUM_MODULUS_SIZE);
218 else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS)
219 fatal("Invalid RSA key length: maximum is %d bits",
220 OPENSSL_RSA_MAX_MODULUS_BITS);
221 break;
222 case KEY_ECDSA:
223 if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
224 #ifdef OPENSSL_HAS_NISTP521
225 fatal("Invalid ECDSA key length: valid lengths are "
226 "256, 384 or 521 bits");
227 #else
228 fatal("Invalid ECDSA key length: valid lengths are "
229 "256 or 384 bits");
230 #endif
231 }
232 #endif
233 }
234
235 /*
236 * Checks whether a file exists and, if so, asks the user whether they wish
237 * to overwrite it.
238 * Returns nonzero if the file does not already exist or if the user agrees to
239 * overwrite, or zero otherwise.
240 */
241 static int
confirm_overwrite(const char * filename)242 confirm_overwrite(const char *filename)
243 {
244 char yesno[3];
245 struct stat st;
246
247 if (stat(filename, &st) != 0)
248 return 1;
249 printf("%s already exists.\n", filename);
250 printf("Overwrite (y/n)? ");
251 fflush(stdout);
252 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
253 return 0;
254 if (yesno[0] != 'y' && yesno[0] != 'Y')
255 return 0;
256 return 1;
257 }
258
259 static void
ask_filename(struct passwd * pw,const char * prompt)260 ask_filename(struct passwd *pw, const char *prompt)
261 {
262 char buf[1024];
263 char *name = NULL;
264
265 if (key_type_name == NULL)
266 name = _PATH_SSH_CLIENT_ID_RSA;
267 else {
268 switch (sshkey_type_from_name(key_type_name)) {
269 case KEY_DSA_CERT:
270 case KEY_DSA:
271 name = _PATH_SSH_CLIENT_ID_DSA;
272 break;
273 #ifdef OPENSSL_HAS_ECC
274 case KEY_ECDSA_CERT:
275 case KEY_ECDSA:
276 name = _PATH_SSH_CLIENT_ID_ECDSA;
277 break;
278 case KEY_ECDSA_SK_CERT:
279 case KEY_ECDSA_SK:
280 name = _PATH_SSH_CLIENT_ID_ECDSA_SK;
281 break;
282 #endif
283 case KEY_RSA_CERT:
284 case KEY_RSA:
285 name = _PATH_SSH_CLIENT_ID_RSA;
286 break;
287 case KEY_ED25519:
288 case KEY_ED25519_CERT:
289 name = _PATH_SSH_CLIENT_ID_ED25519;
290 break;
291 case KEY_ED25519_SK:
292 case KEY_ED25519_SK_CERT:
293 name = _PATH_SSH_CLIENT_ID_ED25519_SK;
294 break;
295 case KEY_XMSS:
296 case KEY_XMSS_CERT:
297 name = _PATH_SSH_CLIENT_ID_XMSS;
298 break;
299 default:
300 fatal("bad key type");
301 }
302 }
303 snprintf(identity_file, sizeof(identity_file),
304 "%s/%s", pw->pw_dir, name);
305 printf("%s (%s): ", prompt, identity_file);
306 fflush(stdout);
307 if (fgets(buf, sizeof(buf), stdin) == NULL)
308 exit(1);
309 buf[strcspn(buf, "\n")] = '\0';
310 if (strcmp(buf, "") != 0)
311 strlcpy(identity_file, buf, sizeof(identity_file));
312 have_identity = 1;
313 }
314
315 static struct sshkey *
load_identity(const char * filename,char ** commentp)316 load_identity(const char *filename, char **commentp)
317 {
318 char *pass;
319 struct sshkey *prv;
320 int r;
321
322 if (commentp != NULL)
323 *commentp = NULL;
324 if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0)
325 return prv;
326 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
327 fatal_r(r, "Load key \"%s\"", filename);
328 if (identity_passphrase)
329 pass = xstrdup(identity_passphrase);
330 else
331 pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
332 r = sshkey_load_private(filename, pass, &prv, commentp);
333 freezero(pass, strlen(pass));
334 if (r != 0)
335 fatal_r(r, "Load key \"%s\"", filename);
336 return prv;
337 }
338
339 #define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
340 #define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
341 #define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
342 #define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
343
344 #ifdef WITH_OPENSSL
345 static void
do_convert_to_ssh2(struct passwd * pw,struct sshkey * k)346 do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
347 {
348 struct sshbuf *b;
349 char comment[61], *b64;
350 int r;
351
352 if ((b = sshbuf_new()) == NULL)
353 fatal_f("sshbuf_new failed");
354 if ((r = sshkey_putb(k, b)) != 0)
355 fatal_fr(r, "put key");
356 if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
357 fatal_f("sshbuf_dtob64_string failed");
358
359 /* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
360 snprintf(comment, sizeof(comment),
361 "%u-bit %s, converted by %s@%s from OpenSSH",
362 sshkey_size(k), sshkey_type(k),
363 pw->pw_name, hostname);
364
365 sshkey_free(k);
366 sshbuf_free(b);
367
368 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
369 fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
370 fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
371 free(b64);
372 exit(0);
373 }
374
375 static void
do_convert_to_pkcs8(struct sshkey * k)376 do_convert_to_pkcs8(struct sshkey *k)
377 {
378 switch (sshkey_type_plain(k->type)) {
379 case KEY_RSA:
380 if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
381 fatal("PEM_write_RSA_PUBKEY failed");
382 break;
383 case KEY_DSA:
384 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
385 fatal("PEM_write_DSA_PUBKEY failed");
386 break;
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 case KEY_DSA:
408 if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
409 fatal("PEM_write_DSA_PUBKEY failed");
410 break;
411 #ifdef OPENSSL_HAS_ECC
412 case KEY_ECDSA:
413 if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
414 fatal("PEM_write_EC_PUBKEY failed");
415 break;
416 #endif
417 default:
418 fatal_f("unsupported key type %s", sshkey_type(k));
419 }
420 exit(0);
421 }
422
423 static void
do_convert_to(struct passwd * pw)424 do_convert_to(struct passwd *pw)
425 {
426 struct sshkey *k;
427 struct stat st;
428 int r;
429
430 if (!have_identity)
431 ask_filename(pw, "Enter file in which the key is");
432 if (stat(identity_file, &st) == -1)
433 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
434 if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
435 k = load_identity(identity_file, NULL);
436 switch (convert_format) {
437 case FMT_RFC4716:
438 do_convert_to_ssh2(pw, k);
439 break;
440 case FMT_PKCS8:
441 do_convert_to_pkcs8(k);
442 break;
443 case FMT_PEM:
444 do_convert_to_pem(k);
445 break;
446 default:
447 fatal_f("unknown key format %d", convert_format);
448 }
449 exit(0);
450 }
451
452 /*
453 * This is almost exactly the bignum1 encoding, but with 32 bit for length
454 * instead of 16.
455 */
456 static void
buffer_get_bignum_bits(struct sshbuf * b,BIGNUM * value)457 buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
458 {
459 u_int bytes, bignum_bits;
460 int r;
461
462 if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
463 fatal_fr(r, "parse");
464 bytes = (bignum_bits + 7) / 8;
465 if (sshbuf_len(b) < bytes)
466 fatal_f("input buffer too small: need %d have %zu",
467 bytes, sshbuf_len(b));
468 if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
469 fatal_f("BN_bin2bn failed");
470 if ((r = sshbuf_consume(b, bytes)) != 0)
471 fatal_fr(r, "consume");
472 }
473
474 static struct sshkey *
do_convert_private_ssh2(struct sshbuf * b)475 do_convert_private_ssh2(struct sshbuf *b)
476 {
477 struct sshkey *key = NULL;
478 char *type, *cipher;
479 u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
480 int r, rlen, ktype;
481 u_int magic, i1, i2, i3, i4;
482 size_t slen;
483 u_long e;
484 BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
485 BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
486 BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
487 BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
488
489 if ((r = sshbuf_get_u32(b, &magic)) != 0)
490 fatal_fr(r, "parse magic");
491
492 if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
493 error("bad magic 0x%x != 0x%x", magic,
494 SSH_COM_PRIVATE_KEY_MAGIC);
495 return NULL;
496 }
497 if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
498 (r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
499 (r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
500 (r = sshbuf_get_u32(b, &i2)) != 0 ||
501 (r = sshbuf_get_u32(b, &i3)) != 0 ||
502 (r = sshbuf_get_u32(b, &i4)) != 0)
503 fatal_fr(r, "parse");
504 debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
505 if (strcmp(cipher, "none") != 0) {
506 error("unsupported cipher %s", cipher);
507 free(cipher);
508 free(type);
509 return NULL;
510 }
511 free(cipher);
512
513 if (strstr(type, "dsa")) {
514 ktype = KEY_DSA;
515 } else if (strstr(type, "rsa")) {
516 ktype = KEY_RSA;
517 } else {
518 free(type);
519 return NULL;
520 }
521 if ((key = sshkey_new(ktype)) == NULL)
522 fatal("sshkey_new failed");
523 free(type);
524
525 switch (key->type) {
526 case KEY_DSA:
527 if ((dsa_p = BN_new()) == NULL ||
528 (dsa_q = BN_new()) == NULL ||
529 (dsa_g = BN_new()) == NULL ||
530 (dsa_pub_key = BN_new()) == NULL ||
531 (dsa_priv_key = BN_new()) == NULL)
532 fatal_f("BN_new");
533 buffer_get_bignum_bits(b, dsa_p);
534 buffer_get_bignum_bits(b, dsa_g);
535 buffer_get_bignum_bits(b, dsa_q);
536 buffer_get_bignum_bits(b, dsa_pub_key);
537 buffer_get_bignum_bits(b, dsa_priv_key);
538 if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
539 fatal_f("DSA_set0_pqg failed");
540 dsa_p = dsa_q = dsa_g = NULL; /* transferred */
541 if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
542 fatal_f("DSA_set0_key failed");
543 dsa_pub_key = dsa_priv_key = NULL; /* transferred */
544 break;
545 case KEY_RSA:
546 if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
547 (e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
548 (e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
549 fatal_fr(r, "parse RSA");
550 e = e1;
551 debug("e %lx", e);
552 if (e < 30) {
553 e <<= 8;
554 e += e2;
555 debug("e %lx", e);
556 e <<= 8;
557 e += e3;
558 debug("e %lx", e);
559 }
560 if ((rsa_e = BN_new()) == NULL)
561 fatal_f("BN_new");
562 if (!BN_set_word(rsa_e, e)) {
563 BN_clear_free(rsa_e);
564 sshkey_free(key);
565 return NULL;
566 }
567 if ((rsa_n = BN_new()) == NULL ||
568 (rsa_d = BN_new()) == NULL ||
569 (rsa_p = BN_new()) == NULL ||
570 (rsa_q = BN_new()) == NULL ||
571 (rsa_iqmp = BN_new()) == NULL)
572 fatal_f("BN_new");
573 buffer_get_bignum_bits(b, rsa_d);
574 buffer_get_bignum_bits(b, rsa_n);
575 buffer_get_bignum_bits(b, rsa_iqmp);
576 buffer_get_bignum_bits(b, rsa_q);
577 buffer_get_bignum_bits(b, rsa_p);
578 if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d))
579 fatal_f("RSA_set0_key failed");
580 rsa_n = rsa_e = rsa_d = NULL; /* transferred */
581 if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q))
582 fatal_f("RSA_set0_factors failed");
583 rsa_p = rsa_q = NULL; /* transferred */
584 if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
585 fatal_fr(r, "generate RSA parameters");
586 BN_clear_free(rsa_iqmp);
587 break;
588 }
589 rlen = sshbuf_len(b);
590 if (rlen != 0)
591 error_f("remaining bytes in key blob %d", rlen);
592
593 /* try the key */
594 if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data),
595 NULL, NULL, NULL, 0)) != 0)
596 error_fr(r, "signing with converted key failed");
597 else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
598 NULL, 0, NULL)) != 0)
599 error_fr(r, "verification with converted key failed");
600 if (r != 0) {
601 sshkey_free(key);
602 free(sig);
603 return NULL;
604 }
605 free(sig);
606 return key;
607 }
608
609 static int
get_line(FILE * fp,char * line,size_t len)610 get_line(FILE *fp, char *line, size_t len)
611 {
612 int c;
613 size_t pos = 0;
614
615 line[0] = '\0';
616 while ((c = fgetc(fp)) != EOF) {
617 if (pos >= len - 1)
618 fatal("input line too long.");
619 switch (c) {
620 case '\r':
621 c = fgetc(fp);
622 if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
623 fatal("unget: %s", strerror(errno));
624 return pos;
625 case '\n':
626 return pos;
627 }
628 line[pos++] = c;
629 line[pos] = '\0';
630 }
631 /* We reached EOF */
632 return -1;
633 }
634
635 static void
do_convert_from_ssh2(struct passwd * pw,struct sshkey ** k,int * private)636 do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
637 {
638 int r, blen, escaped = 0;
639 u_int len;
640 char line[1024];
641 struct sshbuf *buf;
642 char encoded[8096];
643 FILE *fp;
644
645 if ((buf = sshbuf_new()) == NULL)
646 fatal("sshbuf_new failed");
647 if ((fp = fopen(identity_file, "r")) == NULL)
648 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
649 encoded[0] = '\0';
650 while ((blen = get_line(fp, line, sizeof(line))) != -1) {
651 if (blen > 0 && line[blen - 1] == '\\')
652 escaped++;
653 if (strncmp(line, "----", 4) == 0 ||
654 strstr(line, ": ") != NULL) {
655 if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
656 *private = 1;
657 if (strstr(line, " END ") != NULL) {
658 break;
659 }
660 /* fprintf(stderr, "ignore: %s", line); */
661 continue;
662 }
663 if (escaped) {
664 escaped--;
665 /* fprintf(stderr, "escaped: %s", line); */
666 continue;
667 }
668 strlcat(encoded, line, sizeof(encoded));
669 }
670 len = strlen(encoded);
671 if (((len % 4) == 3) &&
672 (encoded[len-1] == '=') &&
673 (encoded[len-2] == '=') &&
674 (encoded[len-3] == '='))
675 encoded[len-3] = '\0';
676 if ((r = sshbuf_b64tod(buf, encoded)) != 0)
677 fatal_fr(r, "base64 decode");
678 if (*private) {
679 if ((*k = do_convert_private_ssh2(buf)) == NULL)
680 fatal_f("private key conversion failed");
681 } else if ((r = sshkey_fromb(buf, k)) != 0)
682 fatal_fr(r, "parse key");
683 sshbuf_free(buf);
684 fclose(fp);
685 }
686
687 static void
do_convert_from_pkcs8(struct sshkey ** k,int * private)688 do_convert_from_pkcs8(struct sshkey **k, int *private)
689 {
690 EVP_PKEY *pubkey;
691 FILE *fp;
692
693 if ((fp = fopen(identity_file, "r")) == NULL)
694 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
695 if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
696 fatal_f("%s is not a recognised public key format",
697 identity_file);
698 }
699 fclose(fp);
700 switch (EVP_PKEY_base_id(pubkey)) {
701 case EVP_PKEY_RSA:
702 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
703 fatal("sshkey_new failed");
704 (*k)->type = KEY_RSA;
705 (*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
706 break;
707 case EVP_PKEY_DSA:
708 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
709 fatal("sshkey_new failed");
710 (*k)->type = KEY_DSA;
711 (*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
712 break;
713 #ifdef OPENSSL_HAS_ECC
714 case EVP_PKEY_EC:
715 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
716 fatal("sshkey_new failed");
717 (*k)->type = KEY_ECDSA;
718 (*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
719 (*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
720 break;
721 #endif
722 default:
723 fatal_f("unsupported pubkey type %d",
724 EVP_PKEY_base_id(pubkey));
725 }
726 EVP_PKEY_free(pubkey);
727 return;
728 }
729
730 static void
do_convert_from_pem(struct sshkey ** k,int * private)731 do_convert_from_pem(struct sshkey **k, int *private)
732 {
733 FILE *fp;
734 RSA *rsa;
735
736 if ((fp = fopen(identity_file, "r")) == NULL)
737 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
738 if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
739 if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
740 fatal("sshkey_new failed");
741 (*k)->type = KEY_RSA;
742 (*k)->rsa = rsa;
743 fclose(fp);
744 return;
745 }
746 fatal_f("unrecognised raw private key format");
747 }
748
749 static void
do_convert_from(struct passwd * pw)750 do_convert_from(struct passwd *pw)
751 {
752 struct sshkey *k = NULL;
753 int r, private = 0, ok = 0;
754 struct stat st;
755
756 if (!have_identity)
757 ask_filename(pw, "Enter file in which the key is");
758 if (stat(identity_file, &st) == -1)
759 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
760
761 switch (convert_format) {
762 case FMT_RFC4716:
763 do_convert_from_ssh2(pw, &k, &private);
764 break;
765 case FMT_PKCS8:
766 do_convert_from_pkcs8(&k, &private);
767 break;
768 case FMT_PEM:
769 do_convert_from_pem(&k, &private);
770 break;
771 default:
772 fatal_f("unknown key format %d", convert_format);
773 }
774
775 if (!private) {
776 if ((r = sshkey_write(k, stdout)) == 0)
777 ok = 1;
778 if (ok)
779 fprintf(stdout, "\n");
780 } else {
781 switch (k->type) {
782 case KEY_DSA:
783 ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
784 NULL, 0, NULL, NULL);
785 break;
786 #ifdef OPENSSL_HAS_ECC
787 case KEY_ECDSA:
788 ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
789 NULL, 0, NULL, NULL);
790 break;
791 #endif
792 case KEY_RSA:
793 ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
794 NULL, 0, NULL, NULL);
795 break;
796 default:
797 fatal_f("unsupported key type %s", sshkey_type(k));
798 }
799 }
800
801 if (!ok)
802 fatal("key write failed");
803 sshkey_free(k);
804 exit(0);
805 }
806 #endif
807
808 static void
do_print_public(struct passwd * pw)809 do_print_public(struct passwd *pw)
810 {
811 struct sshkey *prv;
812 struct stat st;
813 int r;
814 char *comment = NULL;
815
816 if (!have_identity)
817 ask_filename(pw, "Enter file in which the key is");
818 if (stat(identity_file, &st) == -1)
819 fatal("%s: %s", identity_file, strerror(errno));
820 prv = load_identity(identity_file, &comment);
821 if ((r = sshkey_write(prv, stdout)) != 0)
822 fatal_fr(r, "write key");
823 if (comment != NULL && *comment != '\0')
824 fprintf(stdout, " %s", comment);
825 fprintf(stdout, "\n");
826 if (sshkey_is_sk(prv)) {
827 debug("sk_application: \"%s\", sk_flags 0x%02x",
828 prv->sk_application, prv->sk_flags);
829 }
830 sshkey_free(prv);
831 free(comment);
832 exit(0);
833 }
834
835 static void
do_download(struct passwd * pw)836 do_download(struct passwd *pw)
837 {
838 #ifdef ENABLE_PKCS11
839 struct sshkey **keys = NULL;
840 int i, nkeys;
841 enum sshkey_fp_rep rep;
842 int fptype;
843 char *fp, *ra, **comments = NULL;
844
845 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
846 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
847
848 pkcs11_init(1);
849 nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments);
850 if (nkeys <= 0)
851 fatal("cannot read public key from pkcs11");
852 for (i = 0; i < nkeys; i++) {
853 if (print_fingerprint) {
854 fp = sshkey_fingerprint(keys[i], fptype, rep);
855 ra = sshkey_fingerprint(keys[i], fingerprint_hash,
856 SSH_FP_RANDOMART);
857 if (fp == NULL || ra == NULL)
858 fatal_f("sshkey_fingerprint fail");
859 printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
860 fp, sshkey_type(keys[i]));
861 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
862 printf("%s\n", ra);
863 free(ra);
864 free(fp);
865 } else {
866 (void) sshkey_write(keys[i], stdout); /* XXX check */
867 fprintf(stdout, "%s%s\n",
868 *(comments[i]) == '\0' ? "" : " ", comments[i]);
869 }
870 free(comments[i]);
871 sshkey_free(keys[i]);
872 }
873 free(comments);
874 free(keys);
875 pkcs11_terminate();
876 exit(0);
877 #else
878 fatal("no pkcs11 support");
879 #endif /* ENABLE_PKCS11 */
880 }
881
882 static struct sshkey *
try_read_key(char ** cpp)883 try_read_key(char **cpp)
884 {
885 struct sshkey *ret;
886 int r;
887
888 if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
889 fatal("sshkey_new failed");
890 if ((r = sshkey_read(ret, cpp)) == 0)
891 return ret;
892 /* Not a key */
893 sshkey_free(ret);
894 return NULL;
895 }
896
897 static void
fingerprint_one_key(const struct sshkey * public,const char * comment)898 fingerprint_one_key(const struct sshkey *public, const char *comment)
899 {
900 char *fp = NULL, *ra = NULL;
901 enum sshkey_fp_rep rep;
902 int fptype;
903
904 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
905 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
906 fp = sshkey_fingerprint(public, fptype, rep);
907 ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
908 if (fp == NULL || ra == NULL)
909 fatal_f("sshkey_fingerprint failed");
910 mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
911 comment ? comment : "no comment", sshkey_type(public));
912 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
913 printf("%s\n", ra);
914 free(ra);
915 free(fp);
916 }
917
918 static void
fingerprint_private(const char * path)919 fingerprint_private(const char *path)
920 {
921 struct stat st;
922 char *comment = NULL;
923 struct sshkey *privkey = NULL, *pubkey = NULL;
924 int r;
925
926 if (stat(identity_file, &st) == -1)
927 fatal("%s: %s", path, strerror(errno));
928 if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0)
929 debug_r(r, "load public \"%s\"", path);
930 if (pubkey == NULL || comment == NULL || *comment == '\0') {
931 free(comment);
932 if ((r = sshkey_load_private(path, NULL,
933 &privkey, &comment)) != 0)
934 debug_r(r, "load private \"%s\"", path);
935 }
936 if (pubkey == NULL && privkey == NULL)
937 fatal("%s is not a key file.", path);
938
939 fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment);
940 sshkey_free(pubkey);
941 sshkey_free(privkey);
942 free(comment);
943 }
944
945 static void
do_fingerprint(struct passwd * pw)946 do_fingerprint(struct passwd *pw)
947 {
948 FILE *f;
949 struct sshkey *public = NULL;
950 char *comment = NULL, *cp, *ep, *line = NULL;
951 size_t linesize = 0;
952 int i, invalid = 1;
953 const char *path;
954 u_long lnum = 0;
955
956 if (!have_identity)
957 ask_filename(pw, "Enter file in which the key is");
958 path = identity_file;
959
960 if (strcmp(identity_file, "-") == 0) {
961 f = stdin;
962 path = "(stdin)";
963 } else if ((f = fopen(path, "r")) == NULL)
964 fatal("%s: %s: %s", __progname, path, strerror(errno));
965
966 while (getline(&line, &linesize, f) != -1) {
967 lnum++;
968 cp = line;
969 cp[strcspn(cp, "\n")] = '\0';
970 /* Trim leading space and comments */
971 cp = line + strspn(line, " \t");
972 if (*cp == '#' || *cp == '\0')
973 continue;
974
975 /*
976 * Input may be plain keys, private keys, authorized_keys
977 * or known_hosts.
978 */
979
980 /*
981 * Try private keys first. Assume a key is private if
982 * "SSH PRIVATE KEY" appears on the first line and we're
983 * not reading from stdin (XXX support private keys on stdin).
984 */
985 if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
986 strstr(cp, "PRIVATE KEY") != NULL) {
987 free(line);
988 fclose(f);
989 fingerprint_private(path);
990 exit(0);
991 }
992
993 /*
994 * If it's not a private key, then this must be prepared to
995 * accept a public key prefixed with a hostname or options.
996 * Try a bare key first, otherwise skip the leading stuff.
997 */
998 if ((public = try_read_key(&cp)) == NULL) {
999 i = strtol(cp, &ep, 10);
1000 if (i == 0 || ep == NULL ||
1001 (*ep != ' ' && *ep != '\t')) {
1002 int quoted = 0;
1003
1004 comment = cp;
1005 for (; *cp && (quoted || (*cp != ' ' &&
1006 *cp != '\t')); cp++) {
1007 if (*cp == '\\' && cp[1] == '"')
1008 cp++; /* Skip both */
1009 else if (*cp == '"')
1010 quoted = !quoted;
1011 }
1012 if (!*cp)
1013 continue;
1014 *cp++ = '\0';
1015 }
1016 }
1017 /* Retry after parsing leading hostname/key options */
1018 if (public == NULL && (public = try_read_key(&cp)) == NULL) {
1019 debug("%s:%lu: not a public key", path, lnum);
1020 continue;
1021 }
1022
1023 /* Find trailing comment, if any */
1024 for (; *cp == ' ' || *cp == '\t'; cp++)
1025 ;
1026 if (*cp != '\0' && *cp != '#')
1027 comment = cp;
1028
1029 fingerprint_one_key(public, comment);
1030 sshkey_free(public);
1031 invalid = 0; /* One good key in the file is sufficient */
1032 }
1033 fclose(f);
1034 free(line);
1035
1036 if (invalid)
1037 fatal("%s is not a public key file.", path);
1038 exit(0);
1039 }
1040
1041 static void
do_gen_all_hostkeys(struct passwd * pw)1042 do_gen_all_hostkeys(struct passwd *pw)
1043 {
1044 struct {
1045 char *key_type;
1046 char *key_type_display;
1047 char *path;
1048 } key_types[] = {
1049 #ifdef WITH_OPENSSL
1050 { "rsa", "RSA" ,_PATH_HOST_RSA_KEY_FILE },
1051 #ifdef OPENSSL_HAS_ECC
1052 { "ecdsa", "ECDSA",_PATH_HOST_ECDSA_KEY_FILE },
1053 #endif /* OPENSSL_HAS_ECC */
1054 #endif /* WITH_OPENSSL */
1055 { "ed25519", "ED25519",_PATH_HOST_ED25519_KEY_FILE },
1056 #ifdef WITH_XMSS
1057 { "xmss", "XMSS",_PATH_HOST_XMSS_KEY_FILE },
1058 #endif /* WITH_XMSS */
1059 { NULL, NULL, NULL }
1060 };
1061
1062 u_int32_t bits = 0;
1063 int first = 0;
1064 struct stat st;
1065 struct sshkey *private, *public;
1066 char comment[1024], *prv_tmp, *pub_tmp, *prv_file, *pub_file;
1067 int i, type, fd, r;
1068
1069 for (i = 0; key_types[i].key_type; i++) {
1070 public = private = NULL;
1071 prv_tmp = pub_tmp = prv_file = pub_file = NULL;
1072
1073 xasprintf(&prv_file, "%s%s",
1074 identity_file, key_types[i].path);
1075
1076 /* Check whether private key exists and is not zero-length */
1077 if (stat(prv_file, &st) == 0) {
1078 if (st.st_size != 0)
1079 goto next;
1080 } else if (errno != ENOENT) {
1081 error("Could not stat %s: %s", key_types[i].path,
1082 strerror(errno));
1083 goto failnext;
1084 }
1085
1086 /*
1087 * Private key doesn't exist or is invalid; proceed with
1088 * key generation.
1089 */
1090 xasprintf(&prv_tmp, "%s%s.XXXXXXXXXX",
1091 identity_file, key_types[i].path);
1092 xasprintf(&pub_tmp, "%s%s.pub.XXXXXXXXXX",
1093 identity_file, key_types[i].path);
1094 xasprintf(&pub_file, "%s%s.pub",
1095 identity_file, key_types[i].path);
1096
1097 if (first == 0) {
1098 first = 1;
1099 printf("%s: generating new host keys: ", __progname);
1100 }
1101 printf("%s ", key_types[i].key_type_display);
1102 fflush(stdout);
1103 type = sshkey_type_from_name(key_types[i].key_type);
1104 if ((fd = mkstemp(prv_tmp)) == -1) {
1105 error("Could not save your private key in %s: %s",
1106 prv_tmp, strerror(errno));
1107 goto failnext;
1108 }
1109 (void)close(fd); /* just using mkstemp() to reserve a name */
1110 bits = 0;
1111 type_bits_valid(type, NULL, &bits);
1112 if ((r = sshkey_generate(type, bits, &private)) != 0) {
1113 error_r(r, "sshkey_generate failed");
1114 goto failnext;
1115 }
1116 if ((r = sshkey_from_private(private, &public)) != 0)
1117 fatal_fr(r, "sshkey_from_private");
1118 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name,
1119 hostname);
1120 if ((r = sshkey_save_private(private, prv_tmp, "",
1121 comment, private_key_format, openssh_format_cipher,
1122 rounds)) != 0) {
1123 error_r(r, "Saving key \"%s\" failed", prv_tmp);
1124 goto failnext;
1125 }
1126 if ((fd = mkstemp(pub_tmp)) == -1) {
1127 error("Could not save your public key in %s: %s",
1128 pub_tmp, strerror(errno));
1129 goto failnext;
1130 }
1131 (void)fchmod(fd, 0644);
1132 (void)close(fd);
1133 if ((r = sshkey_save_public(public, pub_tmp, comment)) != 0) {
1134 error_r(r, "Unable to save public key to %s",
1135 identity_file);
1136 goto failnext;
1137 }
1138
1139 /* Rename temporary files to their permanent locations. */
1140 if (rename(pub_tmp, pub_file) != 0) {
1141 error("Unable to move %s into position: %s",
1142 pub_file, strerror(errno));
1143 goto failnext;
1144 }
1145 if (rename(prv_tmp, prv_file) != 0) {
1146 error("Unable to move %s into position: %s",
1147 key_types[i].path, strerror(errno));
1148 failnext:
1149 first = 0;
1150 goto next;
1151 }
1152 next:
1153 sshkey_free(private);
1154 sshkey_free(public);
1155 free(prv_tmp);
1156 free(pub_tmp);
1157 free(prv_file);
1158 free(pub_file);
1159 }
1160 if (first != 0)
1161 printf("\n");
1162 }
1163
1164 struct known_hosts_ctx {
1165 const char *host; /* Hostname searched for in find/delete case */
1166 FILE *out; /* Output file, stdout for find_hosts case */
1167 int has_unhashed; /* When hashing, original had unhashed hosts */
1168 int found_key; /* For find/delete, host was found */
1169 int invalid; /* File contained invalid items; don't delete */
1170 int hash_hosts; /* Hash hostnames as we go */
1171 int find_host; /* Search for specific hostname */
1172 int delete_host; /* Delete host from known_hosts */
1173 };
1174
1175 static int
known_hosts_hash(struct hostkey_foreach_line * l,void * _ctx)1176 known_hosts_hash(struct hostkey_foreach_line *l, void *_ctx)
1177 {
1178 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1179 char *hashed, *cp, *hosts, *ohosts;
1180 int has_wild = l->hosts && strcspn(l->hosts, "*?!") != strlen(l->hosts);
1181 int was_hashed = l->hosts && l->hosts[0] == HASH_DELIM;
1182
1183 switch (l->status) {
1184 case HKF_STATUS_OK:
1185 case HKF_STATUS_MATCHED:
1186 /*
1187 * Don't hash hosts already already hashed, with wildcard
1188 * characters or a CA/revocation marker.
1189 */
1190 if (was_hashed || has_wild || l->marker != MRK_NONE) {
1191 fprintf(ctx->out, "%s\n", l->line);
1192 if (has_wild && !ctx->find_host) {
1193 logit("%s:%lu: ignoring host name "
1194 "with wildcard: %.64s", l->path,
1195 l->linenum, l->hosts);
1196 }
1197 return 0;
1198 }
1199 /*
1200 * Split any comma-separated hostnames from the host list,
1201 * hash and store separately.
1202 */
1203 ohosts = hosts = xstrdup(l->hosts);
1204 while ((cp = strsep(&hosts, ",")) != NULL && *cp != '\0') {
1205 lowercase(cp);
1206 if ((hashed = host_hash(cp, NULL, 0)) == NULL)
1207 fatal("hash_host failed");
1208 fprintf(ctx->out, "%s %s\n", hashed, l->rawkey);
1209 free(hashed);
1210 ctx->has_unhashed = 1;
1211 }
1212 free(ohosts);
1213 return 0;
1214 case HKF_STATUS_INVALID:
1215 /* Retain invalid lines, but mark file as invalid. */
1216 ctx->invalid = 1;
1217 logit("%s:%lu: invalid line", l->path, l->linenum);
1218 /* FALLTHROUGH */
1219 default:
1220 fprintf(ctx->out, "%s\n", l->line);
1221 return 0;
1222 }
1223 /* NOTREACHED */
1224 return -1;
1225 }
1226
1227 static int
known_hosts_find_delete(struct hostkey_foreach_line * l,void * _ctx)1228 known_hosts_find_delete(struct hostkey_foreach_line *l, void *_ctx)
1229 {
1230 struct known_hosts_ctx *ctx = (struct known_hosts_ctx *)_ctx;
1231 enum sshkey_fp_rep rep;
1232 int fptype;
1233 char *fp = NULL, *ra = NULL;
1234
1235 fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
1236 rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
1237
1238 if (l->status == HKF_STATUS_MATCHED) {
1239 if (ctx->delete_host) {
1240 if (l->marker != MRK_NONE) {
1241 /* Don't remove CA and revocation lines */
1242 fprintf(ctx->out, "%s\n", l->line);
1243 } else {
1244 /*
1245 * Hostname matches and has no CA/revoke
1246 * marker, delete it by *not* writing the
1247 * line to ctx->out.
1248 */
1249 ctx->found_key = 1;
1250 if (!quiet)
1251 printf("# Host %s found: line %lu\n",
1252 ctx->host, l->linenum);
1253 }
1254 return 0;
1255 } else if (ctx->find_host) {
1256 ctx->found_key = 1;
1257 if (!quiet) {
1258 printf("# Host %s found: line %lu %s\n",
1259 ctx->host,
1260 l->linenum, l->marker == MRK_CA ? "CA" :
1261 (l->marker == MRK_REVOKE ? "REVOKED" : ""));
1262 }
1263 if (ctx->hash_hosts)
1264 known_hosts_hash(l, ctx);
1265 else if (print_fingerprint) {
1266 fp = sshkey_fingerprint(l->key, fptype, rep);
1267 ra = sshkey_fingerprint(l->key,
1268 fingerprint_hash, SSH_FP_RANDOMART);
1269 if (fp == NULL || ra == NULL)
1270 fatal_f("sshkey_fingerprint failed");
1271 mprintf("%s %s %s%s%s\n", ctx->host,
1272 sshkey_type(l->key), fp,
1273 l->comment[0] ? " " : "",
1274 l->comment);
1275 if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
1276 printf("%s\n", ra);
1277 free(ra);
1278 free(fp);
1279 } else
1280 fprintf(ctx->out, "%s\n", l->line);
1281 return 0;
1282 }
1283 } else if (ctx->delete_host) {
1284 /* Retain non-matching hosts when deleting */
1285 if (l->status == HKF_STATUS_INVALID) {
1286 ctx->invalid = 1;
1287 logit("%s:%lu: invalid line", l->path, l->linenum);
1288 }
1289 fprintf(ctx->out, "%s\n", l->line);
1290 }
1291 return 0;
1292 }
1293
1294 static void
do_known_hosts(struct passwd * pw,const char * name,int find_host,int delete_host,int hash_hosts)1295 do_known_hosts(struct passwd *pw, const char *name, int find_host,
1296 int delete_host, int hash_hosts)
1297 {
1298 char *cp, tmp[PATH_MAX], old[PATH_MAX];
1299 int r, fd, oerrno, inplace = 0;
1300 struct known_hosts_ctx ctx;
1301 u_int foreach_options;
1302 struct stat sb;
1303
1304 if (!have_identity) {
1305 cp = tilde_expand_filename(_PATH_SSH_USER_HOSTFILE, pw->pw_uid);
1306 if (strlcpy(identity_file, cp, sizeof(identity_file)) >=
1307 sizeof(identity_file))
1308 fatal("Specified known hosts path too long");
1309 free(cp);
1310 have_identity = 1;
1311 }
1312 if (stat(identity_file, &sb) != 0)
1313 fatal("Cannot stat %s: %s", identity_file, strerror(errno));
1314
1315 memset(&ctx, 0, sizeof(ctx));
1316 ctx.out = stdout;
1317 ctx.host = name;
1318 ctx.hash_hosts = hash_hosts;
1319 ctx.find_host = find_host;
1320 ctx.delete_host = delete_host;
1321
1322 /*
1323 * Find hosts goes to stdout, hash and deletions happen in-place
1324 * A corner case is ssh-keygen -HF foo, which should go to stdout
1325 */
1326 if (!find_host && (hash_hosts || delete_host)) {
1327 if (strlcpy(tmp, identity_file, sizeof(tmp)) >= sizeof(tmp) ||
1328 strlcat(tmp, ".XXXXXXXXXX", sizeof(tmp)) >= sizeof(tmp) ||
1329 strlcpy(old, identity_file, sizeof(old)) >= sizeof(old) ||
1330 strlcat(old, ".old", sizeof(old)) >= sizeof(old))
1331 fatal("known_hosts path too long");
1332 umask(077);
1333 if ((fd = mkstemp(tmp)) == -1)
1334 fatal("mkstemp: %s", strerror(errno));
1335 if ((ctx.out = fdopen(fd, "w")) == NULL) {
1336 oerrno = errno;
1337 unlink(tmp);
1338 fatal("fdopen: %s", strerror(oerrno));
1339 }
1340 fchmod(fd, sb.st_mode & 0644);
1341 inplace = 1;
1342 }
1343 /* XXX support identity_file == "-" for stdin */
1344 foreach_options = find_host ? HKF_WANT_MATCH : 0;
1345 foreach_options |= print_fingerprint ? HKF_WANT_PARSE_KEY : 0;
1346 if ((r = hostkeys_foreach(identity_file, (find_host || !hash_hosts) ?
1347 known_hosts_find_delete : known_hosts_hash, &ctx, name, NULL,
1348 foreach_options, 0)) != 0) {
1349 if (inplace)
1350 unlink(tmp);
1351 fatal_fr(r, "hostkeys_foreach");
1352 }
1353
1354 if (inplace)
1355 fclose(ctx.out);
1356
1357 if (ctx.invalid) {
1358 error("%s is not a valid known_hosts file.", identity_file);
1359 if (inplace) {
1360 error("Not replacing existing known_hosts "
1361 "file because of errors");
1362 unlink(tmp);
1363 }
1364 exit(1);
1365 } else if (delete_host && !ctx.found_key) {
1366 logit("Host %s not found in %s", name, identity_file);
1367 if (inplace)
1368 unlink(tmp);
1369 } else if (inplace) {
1370 /* Backup existing file */
1371 if (unlink(old) == -1 && errno != ENOENT)
1372 fatal("unlink %.100s: %s", old, strerror(errno));
1373 if (link(identity_file, old) == -1)
1374 fatal("link %.100s to %.100s: %s", identity_file, old,
1375 strerror(errno));
1376 /* Move new one into place */
1377 if (rename(tmp, identity_file) == -1) {
1378 error("rename\"%s\" to \"%s\": %s", tmp, identity_file,
1379 strerror(errno));
1380 unlink(tmp);
1381 unlink(old);
1382 exit(1);
1383 }
1384
1385 printf("%s updated.\n", identity_file);
1386 printf("Original contents retained as %s\n", old);
1387 if (ctx.has_unhashed) {
1388 logit("WARNING: %s contains unhashed entries", old);
1389 logit("Delete this file to ensure privacy "
1390 "of hostnames");
1391 }
1392 }
1393
1394 exit (find_host && !ctx.found_key);
1395 }
1396
1397 /*
1398 * Perform changing a passphrase. The argument is the passwd structure
1399 * for the current user.
1400 */
1401 static void
do_change_passphrase(struct passwd * pw)1402 do_change_passphrase(struct passwd *pw)
1403 {
1404 char *comment;
1405 char *old_passphrase, *passphrase1, *passphrase2;
1406 struct stat st;
1407 struct sshkey *private;
1408 int r;
1409
1410 if (!have_identity)
1411 ask_filename(pw, "Enter file in which the key is");
1412 if (stat(identity_file, &st) == -1)
1413 fatal("%s: %s", identity_file, strerror(errno));
1414 /* Try to load the file with empty passphrase. */
1415 r = sshkey_load_private(identity_file, "", &private, &comment);
1416 if (r == SSH_ERR_KEY_WRONG_PASSPHRASE) {
1417 if (identity_passphrase)
1418 old_passphrase = xstrdup(identity_passphrase);
1419 else
1420 old_passphrase =
1421 read_passphrase("Enter old passphrase: ",
1422 RP_ALLOW_STDIN);
1423 r = sshkey_load_private(identity_file, old_passphrase,
1424 &private, &comment);
1425 freezero(old_passphrase, strlen(old_passphrase));
1426 if (r != 0)
1427 goto badkey;
1428 } else if (r != 0) {
1429 badkey:
1430 fatal_r(r, "Failed to load key %s", identity_file);
1431 }
1432 if (comment)
1433 mprintf("Key has comment '%s'\n", comment);
1434
1435 /* Ask the new passphrase (twice). */
1436 if (identity_new_passphrase) {
1437 passphrase1 = xstrdup(identity_new_passphrase);
1438 passphrase2 = NULL;
1439 } else {
1440 passphrase1 =
1441 read_passphrase("Enter new passphrase (empty for no "
1442 "passphrase): ", RP_ALLOW_STDIN);
1443 passphrase2 = read_passphrase("Enter same passphrase again: ",
1444 RP_ALLOW_STDIN);
1445
1446 /* Verify that they are the same. */
1447 if (strcmp(passphrase1, passphrase2) != 0) {
1448 explicit_bzero(passphrase1, strlen(passphrase1));
1449 explicit_bzero(passphrase2, strlen(passphrase2));
1450 free(passphrase1);
1451 free(passphrase2);
1452 printf("Pass phrases do not match. Try again.\n");
1453 exit(1);
1454 }
1455 /* Destroy the other copy. */
1456 freezero(passphrase2, strlen(passphrase2));
1457 }
1458
1459 /* Save the file using the new passphrase. */
1460 if ((r = sshkey_save_private(private, identity_file, passphrase1,
1461 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
1462 error_r(r, "Saving key \"%s\" failed", identity_file);
1463 freezero(passphrase1, strlen(passphrase1));
1464 sshkey_free(private);
1465 free(comment);
1466 exit(1);
1467 }
1468 /* Destroy the passphrase and the copy of the key in memory. */
1469 freezero(passphrase1, strlen(passphrase1));
1470 sshkey_free(private); /* Destroys contents */
1471 free(comment);
1472
1473 printf("Your identification has been saved with the new passphrase.\n");
1474 exit(0);
1475 }
1476
1477 /*
1478 * Print the SSHFP RR.
1479 */
1480 static int
do_print_resource_record(struct passwd * pw,char * fname,char * hname,int print_generic)1481 do_print_resource_record(struct passwd *pw, char *fname, char *hname,
1482 int print_generic)
1483 {
1484 struct sshkey *public;
1485 char *comment = NULL;
1486 struct stat st;
1487 int r;
1488
1489 if (fname == NULL)
1490 fatal_f("no filename");
1491 if (stat(fname, &st) == -1) {
1492 if (errno == ENOENT)
1493 return 0;
1494 fatal("%s: %s", fname, strerror(errno));
1495 }
1496 if ((r = sshkey_load_public(fname, &public, &comment)) != 0)
1497 fatal_r(r, "Failed to read v2 public key from \"%s\"", fname);
1498 export_dns_rr(hname, public, stdout, print_generic);
1499 sshkey_free(public);
1500 free(comment);
1501 return 1;
1502 }
1503
1504 /*
1505 * Change the comment of a private key file.
1506 */
1507 static void
do_change_comment(struct passwd * pw,const char * identity_comment)1508 do_change_comment(struct passwd *pw, const char *identity_comment)
1509 {
1510 char new_comment[1024], *comment, *passphrase;
1511 struct sshkey *private;
1512 struct sshkey *public;
1513 struct stat st;
1514 int r;
1515
1516 if (!have_identity)
1517 ask_filename(pw, "Enter file in which the key is");
1518 if (stat(identity_file, &st) == -1)
1519 fatal("%s: %s", identity_file, strerror(errno));
1520 if ((r = sshkey_load_private(identity_file, "",
1521 &private, &comment)) == 0)
1522 passphrase = xstrdup("");
1523 else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
1524 fatal_r(r, "Cannot load private key \"%s\"", identity_file);
1525 else {
1526 if (identity_passphrase)
1527 passphrase = xstrdup(identity_passphrase);
1528 else if (identity_new_passphrase)
1529 passphrase = xstrdup(identity_new_passphrase);
1530 else
1531 passphrase = read_passphrase("Enter passphrase: ",
1532 RP_ALLOW_STDIN);
1533 /* Try to load using the passphrase. */
1534 if ((r = sshkey_load_private(identity_file, passphrase,
1535 &private, &comment)) != 0) {
1536 freezero(passphrase, strlen(passphrase));
1537 fatal_r(r, "Cannot load private key \"%s\"",
1538 identity_file);
1539 }
1540 }
1541
1542 if (private->type != KEY_ED25519 && private->type != KEY_XMSS &&
1543 private_key_format != SSHKEY_PRIVATE_OPENSSH) {
1544 error("Comments are only supported for keys stored in "
1545 "the new format (-o).");
1546 explicit_bzero(passphrase, strlen(passphrase));
1547 sshkey_free(private);
1548 exit(1);
1549 }
1550 if (comment)
1551 printf("Old comment: %s\n", comment);
1552 else
1553 printf("No existing comment\n");
1554
1555 if (identity_comment) {
1556 strlcpy(new_comment, identity_comment, sizeof(new_comment));
1557 } else {
1558 printf("New comment: ");
1559 fflush(stdout);
1560 if (!fgets(new_comment, sizeof(new_comment), stdin)) {
1561 explicit_bzero(passphrase, strlen(passphrase));
1562 sshkey_free(private);
1563 exit(1);
1564 }
1565 new_comment[strcspn(new_comment, "\n")] = '\0';
1566 }
1567 if (comment != NULL && strcmp(comment, new_comment) == 0) {
1568 printf("No change to comment\n");
1569 free(passphrase);
1570 sshkey_free(private);
1571 free(comment);
1572 exit(0);
1573 }
1574
1575 /* Save the file using the new passphrase. */
1576 if ((r = sshkey_save_private(private, identity_file, passphrase,
1577 new_comment, private_key_format, openssh_format_cipher,
1578 rounds)) != 0) {
1579 error_r(r, "Saving key \"%s\" failed", identity_file);
1580 freezero(passphrase, strlen(passphrase));
1581 sshkey_free(private);
1582 free(comment);
1583 exit(1);
1584 }
1585 freezero(passphrase, strlen(passphrase));
1586 if ((r = sshkey_from_private(private, &public)) != 0)
1587 fatal_fr(r, "sshkey_from_private");
1588 sshkey_free(private);
1589
1590 strlcat(identity_file, ".pub", sizeof(identity_file));
1591 if ((r = sshkey_save_public(public, identity_file, new_comment)) != 0)
1592 fatal_r(r, "Unable to save public key to %s", identity_file);
1593 sshkey_free(public);
1594 free(comment);
1595
1596 if (strlen(new_comment) > 0)
1597 printf("Comment '%s' applied\n", new_comment);
1598 else
1599 printf("Comment removed\n");
1600
1601 exit(0);
1602 }
1603
1604 static void
cert_ext_add(const char * key,const char * value,int iscrit)1605 cert_ext_add(const char *key, const char *value, int iscrit)
1606 {
1607 cert_ext = xreallocarray(cert_ext, ncert_ext + 1, sizeof(*cert_ext));
1608 cert_ext[ncert_ext].key = xstrdup(key);
1609 cert_ext[ncert_ext].val = value == NULL ? NULL : xstrdup(value);
1610 cert_ext[ncert_ext].crit = iscrit;
1611 ncert_ext++;
1612 }
1613
1614 /* qsort(3) comparison function for certificate extensions */
1615 static int
cert_ext_cmp(const void * _a,const void * _b)1616 cert_ext_cmp(const void *_a, const void *_b)
1617 {
1618 const struct cert_ext *a = (const struct cert_ext *)_a;
1619 const struct cert_ext *b = (const struct cert_ext *)_b;
1620 int r;
1621
1622 if (a->crit != b->crit)
1623 return (a->crit < b->crit) ? -1 : 1;
1624 if ((r = strcmp(a->key, b->key)) != 0)
1625 return r;
1626 if ((a->val == NULL) != (b->val == NULL))
1627 return (a->val == NULL) ? -1 : 1;
1628 if (a->val != NULL && (r = strcmp(a->val, b->val)) != 0)
1629 return r;
1630 return 0;
1631 }
1632
1633 #define OPTIONS_CRITICAL 1
1634 #define OPTIONS_EXTENSIONS 2
1635 static void
prepare_options_buf(struct sshbuf * c,int which)1636 prepare_options_buf(struct sshbuf *c, int which)
1637 {
1638 struct sshbuf *b;
1639 size_t i;
1640 int r;
1641 const struct cert_ext *ext;
1642
1643 if ((b = sshbuf_new()) == NULL)
1644 fatal_f("sshbuf_new failed");
1645 sshbuf_reset(c);
1646 for (i = 0; i < ncert_ext; i++) {
1647 ext = &cert_ext[i];
1648 if ((ext->crit && (which & OPTIONS_EXTENSIONS)) ||
1649 (!ext->crit && (which & OPTIONS_CRITICAL)))
1650 continue;
1651 if (ext->val == NULL) {
1652 /* flag option */
1653 debug3_f("%s", ext->key);
1654 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1655 (r = sshbuf_put_string(c, NULL, 0)) != 0)
1656 fatal_fr(r, "prepare flag");
1657 } else {
1658 /* key/value option */
1659 debug3_f("%s=%s", ext->key, ext->val);
1660 sshbuf_reset(b);
1661 if ((r = sshbuf_put_cstring(c, ext->key)) != 0 ||
1662 (r = sshbuf_put_cstring(b, ext->val)) != 0 ||
1663 (r = sshbuf_put_stringb(c, b)) != 0)
1664 fatal_fr(r, "prepare k/v");
1665 }
1666 }
1667 sshbuf_free(b);
1668 }
1669
1670 static void
finalise_cert_exts(void)1671 finalise_cert_exts(void)
1672 {
1673 /* critical options */
1674 if (certflags_command != NULL)
1675 cert_ext_add("force-command", certflags_command, 1);
1676 if (certflags_src_addr != NULL)
1677 cert_ext_add("source-address", certflags_src_addr, 1);
1678 if ((certflags_flags & CERTOPT_REQUIRE_VERIFY) != 0)
1679 cert_ext_add("verify-required", NULL, 1);
1680 /* extensions */
1681 if ((certflags_flags & CERTOPT_X_FWD) != 0)
1682 cert_ext_add("permit-X11-forwarding", NULL, 0);
1683 if ((certflags_flags & CERTOPT_AGENT_FWD) != 0)
1684 cert_ext_add("permit-agent-forwarding", NULL, 0);
1685 if ((certflags_flags & CERTOPT_PORT_FWD) != 0)
1686 cert_ext_add("permit-port-forwarding", NULL, 0);
1687 if ((certflags_flags & CERTOPT_PTY) != 0)
1688 cert_ext_add("permit-pty", NULL, 0);
1689 if ((certflags_flags & CERTOPT_USER_RC) != 0)
1690 cert_ext_add("permit-user-rc", NULL, 0);
1691 if ((certflags_flags & CERTOPT_NO_REQUIRE_USER_PRESENCE) != 0)
1692 cert_ext_add("no-touch-required", NULL, 0);
1693 /* order lexically by key */
1694 if (ncert_ext > 0)
1695 qsort(cert_ext, ncert_ext, sizeof(*cert_ext), cert_ext_cmp);
1696 }
1697
1698 static struct sshkey *
load_pkcs11_key(char * path)1699 load_pkcs11_key(char *path)
1700 {
1701 #ifdef ENABLE_PKCS11
1702 struct sshkey **keys = NULL, *public, *private = NULL;
1703 int r, i, nkeys;
1704
1705 if ((r = sshkey_load_public(path, &public, NULL)) != 0)
1706 fatal_r(r, "Couldn't load CA public key \"%s\"", path);
1707
1708 nkeys = pkcs11_add_provider(pkcs11provider, identity_passphrase,
1709 &keys, NULL);
1710 debug3_f("%d keys", nkeys);
1711 if (nkeys <= 0)
1712 fatal("cannot read public key from pkcs11");
1713 for (i = 0; i < nkeys; i++) {
1714 if (sshkey_equal_public(public, keys[i])) {
1715 private = keys[i];
1716 continue;
1717 }
1718 sshkey_free(keys[i]);
1719 }
1720 free(keys);
1721 sshkey_free(public);
1722 return private;
1723 #else
1724 fatal("no pkcs11 support");
1725 #endif /* ENABLE_PKCS11 */
1726 }
1727
1728 /* Signer for sshkey_certify_custom that uses the agent */
1729 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)1730 agent_signer(struct sshkey *key, u_char **sigp, size_t *lenp,
1731 const u_char *data, size_t datalen,
1732 const char *alg, const char *provider, const char *pin,
1733 u_int compat, void *ctx)
1734 {
1735 int *agent_fdp = (int *)ctx;
1736
1737 return ssh_agent_sign(*agent_fdp, key, sigp, lenp,
1738 data, datalen, alg, compat);
1739 }
1740
1741 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)1742 do_ca_sign(struct passwd *pw, const char *ca_key_path, int prefer_agent,
1743 unsigned long long cert_serial, int cert_serial_autoinc,
1744 int argc, char **argv)
1745 {
1746 int r, i, found, agent_fd = -1;
1747 u_int n;
1748 struct sshkey *ca, *public;
1749 char valid[64], *otmp, *tmp, *cp, *out, *comment;
1750 char *ca_fp = NULL, **plist = NULL, *pin = NULL;
1751 struct ssh_identitylist *agent_ids;
1752 size_t j;
1753 struct notifier_ctx *notifier = NULL;
1754
1755 #ifdef ENABLE_PKCS11
1756 pkcs11_init(1);
1757 #endif
1758 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
1759 if (pkcs11provider != NULL) {
1760 /* If a PKCS#11 token was specified then try to use it */
1761 if ((ca = load_pkcs11_key(tmp)) == NULL)
1762 fatal("No PKCS#11 key matching %s found", ca_key_path);
1763 } else if (prefer_agent) {
1764 /*
1765 * Agent signature requested. Try to use agent after making
1766 * sure the public key specified is actually present in the
1767 * agent.
1768 */
1769 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
1770 fatal_r(r, "Cannot load CA public key %s", tmp);
1771 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0)
1772 fatal_r(r, "Cannot use public key for CA signature");
1773 if ((r = ssh_fetch_identitylist(agent_fd, &agent_ids)) != 0)
1774 fatal_r(r, "Retrieve agent key list");
1775 found = 0;
1776 for (j = 0; j < agent_ids->nkeys; j++) {
1777 if (sshkey_equal(ca, agent_ids->keys[j])) {
1778 found = 1;
1779 break;
1780 }
1781 }
1782 if (!found)
1783 fatal("CA key %s not found in agent", tmp);
1784 ssh_free_identitylist(agent_ids);
1785 ca->flags |= SSHKEY_FLAG_EXT;
1786 } else {
1787 /* CA key is assumed to be a private key on the filesystem */
1788 ca = load_identity(tmp, NULL);
1789 if (sshkey_is_sk(ca) &&
1790 (ca->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
1791 if ((pin = read_passphrase("Enter PIN for CA key: ",
1792 RP_ALLOW_STDIN)) == NULL)
1793 fatal_f("couldn't read PIN");
1794 }
1795 }
1796 free(tmp);
1797
1798 if (key_type_name != NULL) {
1799 if (sshkey_type_from_name(key_type_name) != ca->type) {
1800 fatal("CA key type %s doesn't match specified %s",
1801 sshkey_ssh_name(ca), key_type_name);
1802 }
1803 } else if (ca->type == KEY_RSA) {
1804 /* Default to a good signature algorithm */
1805 key_type_name = "rsa-sha2-512";
1806 }
1807 ca_fp = sshkey_fingerprint(ca, fingerprint_hash, SSH_FP_DEFAULT);
1808
1809 finalise_cert_exts();
1810 for (i = 0; i < argc; i++) {
1811 /* Split list of principals */
1812 n = 0;
1813 if (cert_principals != NULL) {
1814 otmp = tmp = xstrdup(cert_principals);
1815 plist = NULL;
1816 for (; (cp = strsep(&tmp, ",")) != NULL; n++) {
1817 plist = xreallocarray(plist, n + 1, sizeof(*plist));
1818 if (*(plist[n] = xstrdup(cp)) == '\0')
1819 fatal("Empty principal name");
1820 }
1821 free(otmp);
1822 }
1823 if (n > SSHKEY_CERT_MAX_PRINCIPALS)
1824 fatal("Too many certificate principals specified");
1825
1826 tmp = tilde_expand_filename(argv[i], pw->pw_uid);
1827 if ((r = sshkey_load_public(tmp, &public, &comment)) != 0)
1828 fatal_r(r, "load pubkey \"%s\"", tmp);
1829 if (sshkey_is_cert(public))
1830 fatal_f("key \"%s\" type %s cannot be certified",
1831 tmp, sshkey_type(public));
1832
1833 /* Prepare certificate to sign */
1834 if ((r = sshkey_to_certified(public)) != 0)
1835 fatal_r(r, "Could not upgrade key %s to certificate", tmp);
1836 public->cert->type = cert_key_type;
1837 public->cert->serial = (u_int64_t)cert_serial;
1838 public->cert->key_id = xstrdup(cert_key_id);
1839 public->cert->nprincipals = n;
1840 public->cert->principals = plist;
1841 public->cert->valid_after = cert_valid_from;
1842 public->cert->valid_before = cert_valid_to;
1843 prepare_options_buf(public->cert->critical, OPTIONS_CRITICAL);
1844 prepare_options_buf(public->cert->extensions,
1845 OPTIONS_EXTENSIONS);
1846 if ((r = sshkey_from_private(ca,
1847 &public->cert->signature_key)) != 0)
1848 fatal_r(r, "sshkey_from_private (ca key)");
1849
1850 if (agent_fd != -1 && (ca->flags & SSHKEY_FLAG_EXT) != 0) {
1851 if ((r = sshkey_certify_custom(public, ca,
1852 key_type_name, sk_provider, NULL, agent_signer,
1853 &agent_fd)) != 0)
1854 fatal_r(r, "Couldn't certify %s via agent", tmp);
1855 } else {
1856 if (sshkey_is_sk(ca) &&
1857 (ca->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
1858 notifier = notify_start(0,
1859 "Confirm user presence for key %s %s",
1860 sshkey_type(ca), ca_fp);
1861 }
1862 r = sshkey_certify(public, ca, key_type_name,
1863 sk_provider, pin);
1864 notify_complete(notifier, "User presence confirmed");
1865 if (r != 0)
1866 fatal_r(r, "Couldn't certify key %s", tmp);
1867 }
1868
1869 if ((cp = strrchr(tmp, '.')) != NULL && strcmp(cp, ".pub") == 0)
1870 *cp = '\0';
1871 xasprintf(&out, "%s-cert.pub", tmp);
1872 free(tmp);
1873
1874 if ((r = sshkey_save_public(public, out, comment)) != 0) {
1875 fatal_r(r, "Unable to save public key to %s",
1876 identity_file);
1877 }
1878
1879 if (!quiet) {
1880 sshkey_format_cert_validity(public->cert,
1881 valid, sizeof(valid));
1882 logit("Signed %s key %s: id \"%s\" serial %llu%s%s "
1883 "valid %s", sshkey_cert_type(public),
1884 out, public->cert->key_id,
1885 (unsigned long long)public->cert->serial,
1886 cert_principals != NULL ? " for " : "",
1887 cert_principals != NULL ? cert_principals : "",
1888 valid);
1889 }
1890
1891 sshkey_free(public);
1892 free(out);
1893 if (cert_serial_autoinc)
1894 cert_serial++;
1895 }
1896 if (pin != NULL)
1897 freezero(pin, strlen(pin));
1898 free(ca_fp);
1899 #ifdef ENABLE_PKCS11
1900 pkcs11_terminate();
1901 #endif
1902 exit(0);
1903 }
1904
1905 static u_int64_t
parse_relative_time(const char * s,time_t now)1906 parse_relative_time(const char *s, time_t now)
1907 {
1908 int64_t mul, secs;
1909
1910 mul = *s == '-' ? -1 : 1;
1911
1912 if ((secs = convtime(s + 1)) == -1)
1913 fatal("Invalid relative certificate time %s", s);
1914 if (mul == -1 && secs > now)
1915 fatal("Certificate time %s cannot be represented", s);
1916 return now + (u_int64_t)(secs * mul);
1917 }
1918
1919 static void
parse_hex_u64(const char * s,uint64_t * up)1920 parse_hex_u64(const char *s, uint64_t *up)
1921 {
1922 char *ep;
1923 unsigned long long ull;
1924
1925 errno = 0;
1926 ull = strtoull(s, &ep, 16);
1927 if (*s == '\0' || *ep != '\0')
1928 fatal("Invalid certificate time: not a number");
1929 if (errno == ERANGE && ull == ULONG_MAX)
1930 fatal_fr(SSH_ERR_SYSTEM_ERROR, "Invalid certificate time");
1931 *up = (uint64_t)ull;
1932 }
1933
1934 static void
parse_cert_times(char * timespec)1935 parse_cert_times(char *timespec)
1936 {
1937 char *from, *to;
1938 time_t now = time(NULL);
1939 int64_t secs;
1940
1941 /* +timespec relative to now */
1942 if (*timespec == '+' && strchr(timespec, ':') == NULL) {
1943 if ((secs = convtime(timespec + 1)) == -1)
1944 fatal("Invalid relative certificate life %s", timespec);
1945 cert_valid_to = now + secs;
1946 /*
1947 * Backdate certificate one minute to avoid problems on hosts
1948 * with poorly-synchronised clocks.
1949 */
1950 cert_valid_from = ((now - 59)/ 60) * 60;
1951 return;
1952 }
1953
1954 /*
1955 * from:to, where
1956 * from := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "always"
1957 * to := [+-]timespec | YYYYMMDD | YYYYMMDDHHMMSS | 0x... | "forever"
1958 */
1959 from = xstrdup(timespec);
1960 to = strchr(from, ':');
1961 if (to == NULL || from == to || *(to + 1) == '\0')
1962 fatal("Invalid certificate life specification %s", timespec);
1963 *to++ = '\0';
1964
1965 if (*from == '-' || *from == '+')
1966 cert_valid_from = parse_relative_time(from, now);
1967 else if (strcmp(from, "always") == 0)
1968 cert_valid_from = 0;
1969 else if (strncmp(from, "0x", 2) == 0)
1970 parse_hex_u64(from, &cert_valid_from);
1971 else if (parse_absolute_time(from, &cert_valid_from) != 0)
1972 fatal("Invalid from time \"%s\"", from);
1973
1974 if (*to == '-' || *to == '+')
1975 cert_valid_to = parse_relative_time(to, now);
1976 else if (strcmp(to, "forever") == 0)
1977 cert_valid_to = ~(u_int64_t)0;
1978 else if (strncmp(from, "0x", 2) == 0)
1979 parse_hex_u64(to, &cert_valid_to);
1980 else if (parse_absolute_time(to, &cert_valid_to) != 0)
1981 fatal("Invalid to time \"%s\"", to);
1982
1983 if (cert_valid_to <= cert_valid_from)
1984 fatal("Empty certificate validity interval");
1985 free(from);
1986 }
1987
1988 static void
add_cert_option(char * opt)1989 add_cert_option(char *opt)
1990 {
1991 char *val, *cp;
1992 int iscrit = 0;
1993
1994 if (strcasecmp(opt, "clear") == 0)
1995 certflags_flags = 0;
1996 else if (strcasecmp(opt, "no-x11-forwarding") == 0)
1997 certflags_flags &= ~CERTOPT_X_FWD;
1998 else if (strcasecmp(opt, "permit-x11-forwarding") == 0)
1999 certflags_flags |= CERTOPT_X_FWD;
2000 else if (strcasecmp(opt, "no-agent-forwarding") == 0)
2001 certflags_flags &= ~CERTOPT_AGENT_FWD;
2002 else if (strcasecmp(opt, "permit-agent-forwarding") == 0)
2003 certflags_flags |= CERTOPT_AGENT_FWD;
2004 else if (strcasecmp(opt, "no-port-forwarding") == 0)
2005 certflags_flags &= ~CERTOPT_PORT_FWD;
2006 else if (strcasecmp(opt, "permit-port-forwarding") == 0)
2007 certflags_flags |= CERTOPT_PORT_FWD;
2008 else if (strcasecmp(opt, "no-pty") == 0)
2009 certflags_flags &= ~CERTOPT_PTY;
2010 else if (strcasecmp(opt, "permit-pty") == 0)
2011 certflags_flags |= CERTOPT_PTY;
2012 else if (strcasecmp(opt, "no-user-rc") == 0)
2013 certflags_flags &= ~CERTOPT_USER_RC;
2014 else if (strcasecmp(opt, "permit-user-rc") == 0)
2015 certflags_flags |= CERTOPT_USER_RC;
2016 else if (strcasecmp(opt, "touch-required") == 0)
2017 certflags_flags &= ~CERTOPT_NO_REQUIRE_USER_PRESENCE;
2018 else if (strcasecmp(opt, "no-touch-required") == 0)
2019 certflags_flags |= CERTOPT_NO_REQUIRE_USER_PRESENCE;
2020 else if (strcasecmp(opt, "no-verify-required") == 0)
2021 certflags_flags &= ~CERTOPT_REQUIRE_VERIFY;
2022 else if (strcasecmp(opt, "verify-required") == 0)
2023 certflags_flags |= CERTOPT_REQUIRE_VERIFY;
2024 else if (strncasecmp(opt, "force-command=", 14) == 0) {
2025 val = opt + 14;
2026 if (*val == '\0')
2027 fatal("Empty force-command option");
2028 if (certflags_command != NULL)
2029 fatal("force-command already specified");
2030 certflags_command = xstrdup(val);
2031 } else if (strncasecmp(opt, "source-address=", 15) == 0) {
2032 val = opt + 15;
2033 if (*val == '\0')
2034 fatal("Empty source-address option");
2035 if (certflags_src_addr != NULL)
2036 fatal("source-address already specified");
2037 if (addr_match_cidr_list(NULL, val) != 0)
2038 fatal("Invalid source-address list");
2039 certflags_src_addr = xstrdup(val);
2040 } else if (strncasecmp(opt, "extension:", 10) == 0 ||
2041 (iscrit = (strncasecmp(opt, "critical:", 9) == 0))) {
2042 val = xstrdup(strchr(opt, ':') + 1);
2043 if ((cp = strchr(val, '=')) != NULL)
2044 *cp++ = '\0';
2045 cert_ext_add(val, cp, iscrit);
2046 free(val);
2047 } else
2048 fatal("Unsupported certificate option \"%s\"", opt);
2049 }
2050
2051 static void
show_options(struct sshbuf * optbuf,int in_critical)2052 show_options(struct sshbuf *optbuf, int in_critical)
2053 {
2054 char *name, *arg, *hex;
2055 struct sshbuf *options, *option = NULL;
2056 int r;
2057
2058 if ((options = sshbuf_fromb(optbuf)) == NULL)
2059 fatal_f("sshbuf_fromb failed");
2060 while (sshbuf_len(options) != 0) {
2061 sshbuf_free(option);
2062 option = NULL;
2063 if ((r = sshbuf_get_cstring(options, &name, NULL)) != 0 ||
2064 (r = sshbuf_froms(options, &option)) != 0)
2065 fatal_fr(r, "parse option");
2066 printf(" %s", name);
2067 if (!in_critical &&
2068 (strcmp(name, "permit-X11-forwarding") == 0 ||
2069 strcmp(name, "permit-agent-forwarding") == 0 ||
2070 strcmp(name, "permit-port-forwarding") == 0 ||
2071 strcmp(name, "permit-pty") == 0 ||
2072 strcmp(name, "permit-user-rc") == 0 ||
2073 strcmp(name, "no-touch-required") == 0)) {
2074 printf("\n");
2075 } else if (in_critical &&
2076 (strcmp(name, "force-command") == 0 ||
2077 strcmp(name, "source-address") == 0)) {
2078 if ((r = sshbuf_get_cstring(option, &arg, NULL)) != 0)
2079 fatal_fr(r, "parse critical");
2080 printf(" %s\n", arg);
2081 free(arg);
2082 } else if (in_critical &&
2083 strcmp(name, "verify-required") == 0) {
2084 printf("\n");
2085 } else if (sshbuf_len(option) > 0) {
2086 hex = sshbuf_dtob16(option);
2087 printf(" UNKNOWN OPTION: %s (len %zu)\n",
2088 hex, sshbuf_len(option));
2089 sshbuf_reset(option);
2090 free(hex);
2091 } else
2092 printf(" UNKNOWN FLAG OPTION\n");
2093 free(name);
2094 if (sshbuf_len(option) != 0)
2095 fatal("Option corrupt: extra data at end");
2096 }
2097 sshbuf_free(option);
2098 sshbuf_free(options);
2099 }
2100
2101 static void
print_cert(struct sshkey * key)2102 print_cert(struct sshkey *key)
2103 {
2104 char valid[64], *key_fp, *ca_fp;
2105 u_int i;
2106
2107 key_fp = sshkey_fingerprint(key, fingerprint_hash, SSH_FP_DEFAULT);
2108 ca_fp = sshkey_fingerprint(key->cert->signature_key,
2109 fingerprint_hash, SSH_FP_DEFAULT);
2110 if (key_fp == NULL || ca_fp == NULL)
2111 fatal_f("sshkey_fingerprint fail");
2112 sshkey_format_cert_validity(key->cert, valid, sizeof(valid));
2113
2114 printf(" Type: %s %s certificate\n", sshkey_ssh_name(key),
2115 sshkey_cert_type(key));
2116 printf(" Public key: %s %s\n", sshkey_type(key), key_fp);
2117 printf(" Signing CA: %s %s (using %s)\n",
2118 sshkey_type(key->cert->signature_key), ca_fp,
2119 key->cert->signature_type);
2120 printf(" Key ID: \"%s\"\n", key->cert->key_id);
2121 printf(" Serial: %llu\n", (unsigned long long)key->cert->serial);
2122 printf(" Valid: %s\n", valid);
2123 printf(" Principals: ");
2124 if (key->cert->nprincipals == 0)
2125 printf("(none)\n");
2126 else {
2127 for (i = 0; i < key->cert->nprincipals; i++)
2128 printf("\n %s",
2129 key->cert->principals[i]);
2130 printf("\n");
2131 }
2132 printf(" Critical Options: ");
2133 if (sshbuf_len(key->cert->critical) == 0)
2134 printf("(none)\n");
2135 else {
2136 printf("\n");
2137 show_options(key->cert->critical, 1);
2138 }
2139 printf(" Extensions: ");
2140 if (sshbuf_len(key->cert->extensions) == 0)
2141 printf("(none)\n");
2142 else {
2143 printf("\n");
2144 show_options(key->cert->extensions, 0);
2145 }
2146 }
2147
2148 static void
do_show_cert(struct passwd * pw)2149 do_show_cert(struct passwd *pw)
2150 {
2151 struct sshkey *key = NULL;
2152 struct stat st;
2153 int r, is_stdin = 0, ok = 0;
2154 FILE *f;
2155 char *cp, *line = NULL;
2156 const char *path;
2157 size_t linesize = 0;
2158 u_long lnum = 0;
2159
2160 if (!have_identity)
2161 ask_filename(pw, "Enter file in which the key is");
2162 if (strcmp(identity_file, "-") != 0 && stat(identity_file, &st) == -1)
2163 fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
2164
2165 path = identity_file;
2166 if (strcmp(path, "-") == 0) {
2167 f = stdin;
2168 path = "(stdin)";
2169 is_stdin = 1;
2170 } else if ((f = fopen(identity_file, "r")) == NULL)
2171 fatal("fopen %s: %s", identity_file, strerror(errno));
2172
2173 while (getline(&line, &linesize, f) != -1) {
2174 lnum++;
2175 sshkey_free(key);
2176 key = NULL;
2177 /* Trim leading space and comments */
2178 cp = line + strspn(line, " \t");
2179 if (*cp == '#' || *cp == '\0')
2180 continue;
2181 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2182 fatal("sshkey_new");
2183 if ((r = sshkey_read(key, &cp)) != 0) {
2184 error_r(r, "%s:%lu: invalid key", path, lnum);
2185 continue;
2186 }
2187 if (!sshkey_is_cert(key)) {
2188 error("%s:%lu is not a certificate", path, lnum);
2189 continue;
2190 }
2191 ok = 1;
2192 if (!is_stdin && lnum == 1)
2193 printf("%s:\n", path);
2194 else
2195 printf("%s:%lu:\n", path, lnum);
2196 print_cert(key);
2197 }
2198 free(line);
2199 sshkey_free(key);
2200 fclose(f);
2201 exit(ok ? 0 : 1);
2202 }
2203
2204 static void
load_krl(const char * path,struct ssh_krl ** krlp)2205 load_krl(const char *path, struct ssh_krl **krlp)
2206 {
2207 struct sshbuf *krlbuf;
2208 int r;
2209
2210 if ((r = sshbuf_load_file(path, &krlbuf)) != 0)
2211 fatal_r(r, "Unable to load KRL %s", path);
2212 /* XXX check sigs */
2213 if ((r = ssh_krl_from_blob(krlbuf, krlp, NULL, 0)) != 0 ||
2214 *krlp == NULL)
2215 fatal_r(r, "Invalid KRL file %s", path);
2216 sshbuf_free(krlbuf);
2217 }
2218
2219 static void
hash_to_blob(const char * cp,u_char ** blobp,size_t * lenp,const char * file,u_long lnum)2220 hash_to_blob(const char *cp, u_char **blobp, size_t *lenp,
2221 const char *file, u_long lnum)
2222 {
2223 char *tmp;
2224 size_t tlen;
2225 struct sshbuf *b;
2226 int r;
2227
2228 if (strncmp(cp, "SHA256:", 7) != 0)
2229 fatal("%s:%lu: unsupported hash algorithm", file, lnum);
2230 cp += 7;
2231
2232 /*
2233 * OpenSSH base64 hashes omit trailing '='
2234 * characters; put them back for decode.
2235 */
2236 tlen = strlen(cp);
2237 tmp = xmalloc(tlen + 4 + 1);
2238 strlcpy(tmp, cp, tlen + 1);
2239 while ((tlen % 4) != 0) {
2240 tmp[tlen++] = '=';
2241 tmp[tlen] = '\0';
2242 }
2243 if ((b = sshbuf_new()) == NULL)
2244 fatal_f("sshbuf_new failed");
2245 if ((r = sshbuf_b64tod(b, tmp)) != 0)
2246 fatal_r(r, "%s:%lu: decode hash failed", file, lnum);
2247 free(tmp);
2248 *lenp = sshbuf_len(b);
2249 *blobp = xmalloc(*lenp);
2250 memcpy(*blobp, sshbuf_ptr(b), *lenp);
2251 sshbuf_free(b);
2252 }
2253
2254 static void
update_krl_from_file(struct passwd * pw,const char * file,int wild_ca,const struct sshkey * ca,struct ssh_krl * krl)2255 update_krl_from_file(struct passwd *pw, const char *file, int wild_ca,
2256 const struct sshkey *ca, struct ssh_krl *krl)
2257 {
2258 struct sshkey *key = NULL;
2259 u_long lnum = 0;
2260 char *path, *cp, *ep, *line = NULL;
2261 u_char *blob = NULL;
2262 size_t blen = 0, linesize = 0;
2263 unsigned long long serial, serial2;
2264 int i, was_explicit_key, was_sha1, was_sha256, was_hash, r;
2265 FILE *krl_spec;
2266
2267 path = tilde_expand_filename(file, pw->pw_uid);
2268 if (strcmp(path, "-") == 0) {
2269 krl_spec = stdin;
2270 free(path);
2271 path = xstrdup("(standard input)");
2272 } else if ((krl_spec = fopen(path, "r")) == NULL)
2273 fatal("fopen %s: %s", path, strerror(errno));
2274
2275 if (!quiet)
2276 printf("Revoking from %s\n", path);
2277 while (getline(&line, &linesize, krl_spec) != -1) {
2278 lnum++;
2279 was_explicit_key = was_sha1 = was_sha256 = was_hash = 0;
2280 cp = line + strspn(line, " \t");
2281 /* Trim trailing space, comments and strip \n */
2282 for (i = 0, r = -1; cp[i] != '\0'; i++) {
2283 if (cp[i] == '#' || cp[i] == '\n') {
2284 cp[i] = '\0';
2285 break;
2286 }
2287 if (cp[i] == ' ' || cp[i] == '\t') {
2288 /* Remember the start of a span of whitespace */
2289 if (r == -1)
2290 r = i;
2291 } else
2292 r = -1;
2293 }
2294 if (r != -1)
2295 cp[r] = '\0';
2296 if (*cp == '\0')
2297 continue;
2298 if (strncasecmp(cp, "serial:", 7) == 0) {
2299 if (ca == NULL && !wild_ca) {
2300 fatal("revoking certificates by serial number "
2301 "requires specification of a CA key");
2302 }
2303 cp += 7;
2304 cp = cp + strspn(cp, " \t");
2305 errno = 0;
2306 serial = strtoull(cp, &ep, 0);
2307 if (*cp == '\0' || (*ep != '\0' && *ep != '-'))
2308 fatal("%s:%lu: invalid serial \"%s\"",
2309 path, lnum, cp);
2310 if (errno == ERANGE && serial == ULLONG_MAX)
2311 fatal("%s:%lu: serial out of range",
2312 path, lnum);
2313 serial2 = serial;
2314 if (*ep == '-') {
2315 cp = ep + 1;
2316 errno = 0;
2317 serial2 = strtoull(cp, &ep, 0);
2318 if (*cp == '\0' || *ep != '\0')
2319 fatal("%s:%lu: invalid serial \"%s\"",
2320 path, lnum, cp);
2321 if (errno == ERANGE && serial2 == ULLONG_MAX)
2322 fatal("%s:%lu: serial out of range",
2323 path, lnum);
2324 if (serial2 <= serial)
2325 fatal("%s:%lu: invalid serial range "
2326 "%llu:%llu", path, lnum,
2327 (unsigned long long)serial,
2328 (unsigned long long)serial2);
2329 }
2330 if (ssh_krl_revoke_cert_by_serial_range(krl,
2331 ca, serial, serial2) != 0) {
2332 fatal_f("revoke serial failed");
2333 }
2334 } else if (strncasecmp(cp, "id:", 3) == 0) {
2335 if (ca == NULL && !wild_ca) {
2336 fatal("revoking certificates by key ID "
2337 "requires specification of a CA key");
2338 }
2339 cp += 3;
2340 cp = cp + strspn(cp, " \t");
2341 if (ssh_krl_revoke_cert_by_key_id(krl, ca, cp) != 0)
2342 fatal_f("revoke key ID failed");
2343 } else if (strncasecmp(cp, "hash:", 5) == 0) {
2344 cp += 5;
2345 cp = cp + strspn(cp, " \t");
2346 hash_to_blob(cp, &blob, &blen, file, lnum);
2347 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2348 if (r != 0)
2349 fatal_fr(r, "revoke key failed");
2350 } else {
2351 if (strncasecmp(cp, "key:", 4) == 0) {
2352 cp += 4;
2353 cp = cp + strspn(cp, " \t");
2354 was_explicit_key = 1;
2355 } else if (strncasecmp(cp, "sha1:", 5) == 0) {
2356 cp += 5;
2357 cp = cp + strspn(cp, " \t");
2358 was_sha1 = 1;
2359 } else if (strncasecmp(cp, "sha256:", 7) == 0) {
2360 cp += 7;
2361 cp = cp + strspn(cp, " \t");
2362 was_sha256 = 1;
2363 /*
2364 * Just try to process the line as a key.
2365 * Parsing will fail if it isn't.
2366 */
2367 }
2368 if ((key = sshkey_new(KEY_UNSPEC)) == NULL)
2369 fatal("sshkey_new");
2370 if ((r = sshkey_read(key, &cp)) != 0)
2371 fatal_r(r, "%s:%lu: invalid key", path, lnum);
2372 if (was_explicit_key)
2373 r = ssh_krl_revoke_key_explicit(krl, key);
2374 else if (was_sha1) {
2375 if (sshkey_fingerprint_raw(key,
2376 SSH_DIGEST_SHA1, &blob, &blen) != 0) {
2377 fatal("%s:%lu: fingerprint failed",
2378 file, lnum);
2379 }
2380 r = ssh_krl_revoke_key_sha1(krl, blob, blen);
2381 } else if (was_sha256) {
2382 if (sshkey_fingerprint_raw(key,
2383 SSH_DIGEST_SHA256, &blob, &blen) != 0) {
2384 fatal("%s:%lu: fingerprint failed",
2385 file, lnum);
2386 }
2387 r = ssh_krl_revoke_key_sha256(krl, blob, blen);
2388 } else
2389 r = ssh_krl_revoke_key(krl, key);
2390 if (r != 0)
2391 fatal_fr(r, "revoke key failed");
2392 freezero(blob, blen);
2393 blob = NULL;
2394 blen = 0;
2395 sshkey_free(key);
2396 }
2397 }
2398 if (strcmp(path, "-") != 0)
2399 fclose(krl_spec);
2400 free(line);
2401 free(path);
2402 }
2403
2404 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)2405 do_gen_krl(struct passwd *pw, int updating, const char *ca_key_path,
2406 unsigned long long krl_version, const char *krl_comment,
2407 int argc, char **argv)
2408 {
2409 struct ssh_krl *krl;
2410 struct stat sb;
2411 struct sshkey *ca = NULL;
2412 int i, r, wild_ca = 0;
2413 char *tmp;
2414 struct sshbuf *kbuf;
2415
2416 if (*identity_file == '\0')
2417 fatal("KRL generation requires an output file");
2418 if (stat(identity_file, &sb) == -1) {
2419 if (errno != ENOENT)
2420 fatal("Cannot access KRL \"%s\": %s",
2421 identity_file, strerror(errno));
2422 if (updating)
2423 fatal("KRL \"%s\" does not exist", identity_file);
2424 }
2425 if (ca_key_path != NULL) {
2426 if (strcasecmp(ca_key_path, "none") == 0)
2427 wild_ca = 1;
2428 else {
2429 tmp = tilde_expand_filename(ca_key_path, pw->pw_uid);
2430 if ((r = sshkey_load_public(tmp, &ca, NULL)) != 0)
2431 fatal_r(r, "Cannot load CA public key %s", tmp);
2432 free(tmp);
2433 }
2434 }
2435
2436 if (updating)
2437 load_krl(identity_file, &krl);
2438 else if ((krl = ssh_krl_init()) == NULL)
2439 fatal("couldn't create KRL");
2440
2441 if (krl_version != 0)
2442 ssh_krl_set_version(krl, krl_version);
2443 if (krl_comment != NULL)
2444 ssh_krl_set_comment(krl, krl_comment);
2445
2446 for (i = 0; i < argc; i++)
2447 update_krl_from_file(pw, argv[i], wild_ca, ca, krl);
2448
2449 if ((kbuf = sshbuf_new()) == NULL)
2450 fatal("sshbuf_new failed");
2451 if (ssh_krl_to_blob(krl, kbuf, NULL, 0) != 0)
2452 fatal("Couldn't generate KRL");
2453 if ((r = sshbuf_write_file(identity_file, kbuf)) != 0)
2454 fatal("write %s: %s", identity_file, strerror(errno));
2455 sshbuf_free(kbuf);
2456 ssh_krl_free(krl);
2457 sshkey_free(ca);
2458 }
2459
2460 static void
do_check_krl(struct passwd * pw,int print_krl,int argc,char ** argv)2461 do_check_krl(struct passwd *pw, int print_krl, int argc, char **argv)
2462 {
2463 int i, r, ret = 0;
2464 char *comment;
2465 struct ssh_krl *krl;
2466 struct sshkey *k;
2467
2468 if (*identity_file == '\0')
2469 fatal("KRL checking requires an input file");
2470 load_krl(identity_file, &krl);
2471 if (print_krl)
2472 krl_dump(krl, stdout);
2473 for (i = 0; i < argc; i++) {
2474 if ((r = sshkey_load_public(argv[i], &k, &comment)) != 0)
2475 fatal_r(r, "Cannot load public key %s", argv[i]);
2476 r = ssh_krl_check_key(krl, k);
2477 printf("%s%s%s%s: %s\n", argv[i],
2478 *comment ? " (" : "", comment, *comment ? ")" : "",
2479 r == 0 ? "ok" : "REVOKED");
2480 if (r != 0)
2481 ret = 1;
2482 sshkey_free(k);
2483 free(comment);
2484 }
2485 ssh_krl_free(krl);
2486 exit(ret);
2487 }
2488
2489 static struct sshkey *
load_sign_key(const char * keypath,const struct sshkey * pubkey)2490 load_sign_key(const char *keypath, const struct sshkey *pubkey)
2491 {
2492 size_t i, slen, plen = strlen(keypath);
2493 char *privpath = xstrdup(keypath);
2494 static const char * const suffixes[] = { "-cert.pub", ".pub", NULL };
2495 struct sshkey *ret = NULL, *privkey = NULL;
2496 int r, waspub = 0;
2497 struct stat st;
2498
2499 /*
2500 * If passed a public key filename, then try to locate the corresponding
2501 * private key. This lets us specify certificates on the command-line
2502 * and have ssh-keygen find the appropriate private key.
2503 */
2504 for (i = 0; suffixes[i]; i++) {
2505 slen = strlen(suffixes[i]);
2506 if (plen <= slen ||
2507 strcmp(privpath + plen - slen, suffixes[i]) != 0)
2508 continue;
2509 privpath[plen - slen] = '\0';
2510 debug_f("%s looks like a public key, using private key "
2511 "path %s instead", keypath, privpath);
2512 waspub = 1;
2513 }
2514 if (waspub && stat(privpath, &st) != 0 && errno == ENOENT)
2515 fatal("No private key found for public key \"%s\"", keypath);
2516 if ((r = sshkey_load_private(privpath, "", &privkey, NULL)) != 0 &&
2517 (r != SSH_ERR_KEY_WRONG_PASSPHRASE)) {
2518 debug_fr(r, "load private key \"%s\"", privpath);
2519 fatal("No private key found for \"%s\"", privpath);
2520 } else if (privkey == NULL)
2521 privkey = load_identity(privpath, NULL);
2522
2523 if (!sshkey_equal_public(pubkey, privkey)) {
2524 error("Public key %s doesn't match private %s",
2525 keypath, privpath);
2526 goto done;
2527 }
2528 if (sshkey_is_cert(pubkey) && !sshkey_is_cert(privkey)) {
2529 /*
2530 * Graft the certificate onto the private key to make
2531 * it capable of signing.
2532 */
2533 if ((r = sshkey_to_certified(privkey)) != 0) {
2534 error_fr(r, "sshkey_to_certified");
2535 goto done;
2536 }
2537 if ((r = sshkey_cert_copy(pubkey, privkey)) != 0) {
2538 error_fr(r, "sshkey_cert_copy");
2539 goto done;
2540 }
2541 }
2542 /* success */
2543 ret = privkey;
2544 privkey = NULL;
2545 done:
2546 sshkey_free(privkey);
2547 free(privpath);
2548 return ret;
2549 }
2550
2551 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)2552 sign_one(struct sshkey *signkey, const char *filename, int fd,
2553 const char *sig_namespace, const char *hashalg, sshsig_signer *signer,
2554 void *signer_ctx)
2555 {
2556 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2557 int r = SSH_ERR_INTERNAL_ERROR, wfd = -1, oerrno;
2558 char *wfile = NULL, *asig = NULL, *fp = NULL;
2559 char *pin = NULL, *prompt = NULL;
2560
2561 if (!quiet) {
2562 if (fd == STDIN_FILENO)
2563 fprintf(stderr, "Signing data on standard input\n");
2564 else
2565 fprintf(stderr, "Signing file %s\n", filename);
2566 }
2567 if (signer == NULL && sshkey_is_sk(signkey)) {
2568 if ((signkey->sk_flags & SSH_SK_USER_VERIFICATION_REQD)) {
2569 xasprintf(&prompt, "Enter PIN for %s key: ",
2570 sshkey_type(signkey));
2571 if ((pin = read_passphrase(prompt,
2572 RP_ALLOW_STDIN)) == NULL)
2573 fatal_f("couldn't read PIN");
2574 }
2575 if ((signkey->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
2576 if ((fp = sshkey_fingerprint(signkey, fingerprint_hash,
2577 SSH_FP_DEFAULT)) == NULL)
2578 fatal_f("fingerprint failed");
2579 fprintf(stderr, "Confirm user presence for key %s %s\n",
2580 sshkey_type(signkey), fp);
2581 free(fp);
2582 }
2583 }
2584 if ((r = sshsig_sign_fd(signkey, hashalg, sk_provider, pin,
2585 fd, sig_namespace, &sigbuf, signer, signer_ctx)) != 0) {
2586 error_r(r, "Signing %s failed", filename);
2587 goto out;
2588 }
2589 if ((r = sshsig_armor(sigbuf, &abuf)) != 0) {
2590 error_fr(r, "sshsig_armor");
2591 goto out;
2592 }
2593 if ((asig = sshbuf_dup_string(abuf)) == NULL) {
2594 error_f("buffer error");
2595 r = SSH_ERR_ALLOC_FAIL;
2596 goto out;
2597 }
2598
2599 if (fd == STDIN_FILENO) {
2600 fputs(asig, stdout);
2601 fflush(stdout);
2602 } else {
2603 xasprintf(&wfile, "%s.sig", filename);
2604 if (confirm_overwrite(wfile)) {
2605 if ((wfd = open(wfile, O_WRONLY|O_CREAT|O_TRUNC,
2606 0666)) == -1) {
2607 oerrno = errno;
2608 error("Cannot open %s: %s",
2609 wfile, strerror(errno));
2610 errno = oerrno;
2611 r = SSH_ERR_SYSTEM_ERROR;
2612 goto out;
2613 }
2614 if (atomicio(vwrite, wfd, asig,
2615 strlen(asig)) != strlen(asig)) {
2616 oerrno = errno;
2617 error("Cannot write to %s: %s",
2618 wfile, strerror(errno));
2619 errno = oerrno;
2620 r = SSH_ERR_SYSTEM_ERROR;
2621 goto out;
2622 }
2623 if (!quiet) {
2624 fprintf(stderr, "Write signature to %s\n",
2625 wfile);
2626 }
2627 }
2628 }
2629 /* success */
2630 r = 0;
2631 out:
2632 free(wfile);
2633 free(prompt);
2634 free(asig);
2635 if (pin != NULL)
2636 freezero(pin, strlen(pin));
2637 sshbuf_free(abuf);
2638 sshbuf_free(sigbuf);
2639 if (wfd != -1)
2640 close(wfd);
2641 return r;
2642 }
2643
2644 static int
sig_process_opts(char * const * opts,size_t nopts,char ** hashalgp,uint64_t * verify_timep,int * print_pubkey)2645 sig_process_opts(char * const *opts, size_t nopts, char **hashalgp,
2646 uint64_t *verify_timep, int *print_pubkey)
2647 {
2648 size_t i;
2649 time_t now;
2650
2651 if (verify_timep != NULL)
2652 *verify_timep = 0;
2653 if (print_pubkey != NULL)
2654 *print_pubkey = 0;
2655 if (hashalgp != NULL)
2656 *hashalgp = NULL;
2657 for (i = 0; i < nopts; i++) {
2658 if (hashalgp != NULL &&
2659 strncasecmp(opts[i], "hashalg=", 8) == 0) {
2660 *hashalgp = xstrdup(opts[i] + 8);
2661 } else if (verify_timep &&
2662 strncasecmp(opts[i], "verify-time=", 12) == 0) {
2663 if (parse_absolute_time(opts[i] + 12,
2664 verify_timep) != 0 || *verify_timep == 0) {
2665 error("Invalid \"verify-time\" option");
2666 return SSH_ERR_INVALID_ARGUMENT;
2667 }
2668 } else if (print_pubkey &&
2669 strcasecmp(opts[i], "print-pubkey") == 0) {
2670 *print_pubkey = 1;
2671 } else {
2672 error("Invalid option \"%s\"", opts[i]);
2673 return SSH_ERR_INVALID_ARGUMENT;
2674 }
2675 }
2676 if (verify_timep && *verify_timep == 0) {
2677 if ((now = time(NULL)) < 0) {
2678 error("Time is before epoch");
2679 return SSH_ERR_INVALID_ARGUMENT;
2680 }
2681 *verify_timep = (uint64_t)now;
2682 }
2683 return 0;
2684 }
2685
2686
2687 static int
sig_sign(const char * keypath,const char * sig_namespace,int require_agent,int argc,char ** argv,char * const * opts,size_t nopts)2688 sig_sign(const char *keypath, const char *sig_namespace, int require_agent,
2689 int argc, char **argv, char * const *opts, size_t nopts)
2690 {
2691 int i, fd = -1, r, ret = -1;
2692 int agent_fd = -1;
2693 struct sshkey *pubkey = NULL, *privkey = NULL, *signkey = NULL;
2694 sshsig_signer *signer = NULL;
2695 char *hashalg = NULL;
2696
2697 /* Check file arguments. */
2698 for (i = 0; i < argc; i++) {
2699 if (strcmp(argv[i], "-") != 0)
2700 continue;
2701 if (i > 0 || argc > 1)
2702 fatal("Cannot sign mix of paths and standard input");
2703 }
2704
2705 if (sig_process_opts(opts, nopts, &hashalg, NULL, NULL) != 0)
2706 goto done; /* error already logged */
2707
2708 if ((r = sshkey_load_public(keypath, &pubkey, NULL)) != 0) {
2709 error_r(r, "Couldn't load public key %s", keypath);
2710 goto done;
2711 }
2712
2713 if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
2714 if (require_agent)
2715 fatal("Couldn't get agent socket");
2716 debug_r(r, "Couldn't get agent socket");
2717 } else {
2718 if ((r = ssh_agent_has_key(agent_fd, pubkey)) == 0)
2719 signer = agent_signer;
2720 else {
2721 if (require_agent)
2722 fatal("Couldn't find key in agent");
2723 debug_r(r, "Couldn't find key in agent");
2724 }
2725 }
2726
2727 if (signer == NULL) {
2728 /* Not using agent - try to load private key */
2729 if ((privkey = load_sign_key(keypath, pubkey)) == NULL)
2730 goto done;
2731 signkey = privkey;
2732 } else {
2733 /* Will use key in agent */
2734 signkey = pubkey;
2735 }
2736
2737 if (argc == 0) {
2738 if ((r = sign_one(signkey, "(stdin)", STDIN_FILENO,
2739 sig_namespace, hashalg, signer, &agent_fd)) != 0)
2740 goto done;
2741 } else {
2742 for (i = 0; i < argc; i++) {
2743 if (strcmp(argv[i], "-") == 0)
2744 fd = STDIN_FILENO;
2745 else if ((fd = open(argv[i], O_RDONLY)) == -1) {
2746 error("Cannot open %s for signing: %s",
2747 argv[i], strerror(errno));
2748 goto done;
2749 }
2750 if ((r = sign_one(signkey, argv[i], fd, sig_namespace,
2751 hashalg, signer, &agent_fd)) != 0)
2752 goto done;
2753 if (fd != STDIN_FILENO)
2754 close(fd);
2755 fd = -1;
2756 }
2757 }
2758
2759 ret = 0;
2760 done:
2761 if (fd != -1 && fd != STDIN_FILENO)
2762 close(fd);
2763 sshkey_free(pubkey);
2764 sshkey_free(privkey);
2765 free(hashalg);
2766 return ret;
2767 }
2768
2769 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)2770 sig_verify(const char *signature, const char *sig_namespace,
2771 const char *principal, const char *allowed_keys, const char *revoked_keys,
2772 char * const *opts, size_t nopts)
2773 {
2774 int r, ret = -1;
2775 int print_pubkey = 0;
2776 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2777 struct sshkey *sign_key = NULL;
2778 char *fp = NULL;
2779 struct sshkey_sig_details *sig_details = NULL;
2780 uint64_t verify_time = 0;
2781
2782 if (sig_process_opts(opts, nopts, NULL, &verify_time,
2783 &print_pubkey) != 0)
2784 goto done; /* error already logged */
2785
2786 memset(&sig_details, 0, sizeof(sig_details));
2787 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2788 error_r(r, "Couldn't read signature file");
2789 goto done;
2790 }
2791
2792 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2793 error_fr(r, "sshsig_armor");
2794 goto done;
2795 }
2796 if ((r = sshsig_verify_fd(sigbuf, STDIN_FILENO, sig_namespace,
2797 &sign_key, &sig_details)) != 0)
2798 goto done; /* sshsig_verify() prints error */
2799
2800 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2801 SSH_FP_DEFAULT)) == NULL)
2802 fatal_f("sshkey_fingerprint failed");
2803 debug("Valid (unverified) signature from key %s", fp);
2804 if (sig_details != NULL) {
2805 debug2_f("signature details: counter = %u, flags = 0x%02x",
2806 sig_details->sk_counter, sig_details->sk_flags);
2807 }
2808 free(fp);
2809 fp = NULL;
2810
2811 if (revoked_keys != NULL) {
2812 if ((r = sshkey_check_revoked(sign_key, revoked_keys)) != 0) {
2813 debug3_fr(r, "sshkey_check_revoked");
2814 goto done;
2815 }
2816 }
2817
2818 if (allowed_keys != NULL && (r = sshsig_check_allowed_keys(allowed_keys,
2819 sign_key, principal, sig_namespace, verify_time)) != 0) {
2820 debug3_fr(r, "sshsig_check_allowed_keys");
2821 goto done;
2822 }
2823 /* success */
2824 ret = 0;
2825 done:
2826 if (!quiet) {
2827 if (ret == 0) {
2828 if ((fp = sshkey_fingerprint(sign_key, fingerprint_hash,
2829 SSH_FP_DEFAULT)) == NULL)
2830 fatal_f("sshkey_fingerprint failed");
2831 if (principal == NULL) {
2832 printf("Good \"%s\" signature with %s key %s\n",
2833 sig_namespace, sshkey_type(sign_key), fp);
2834
2835 } else {
2836 printf("Good \"%s\" signature for %s with %s key %s\n",
2837 sig_namespace, principal,
2838 sshkey_type(sign_key), fp);
2839 }
2840 } else {
2841 printf("Could not verify signature.\n");
2842 }
2843 }
2844 /* Print the signature key if requested */
2845 if (ret == 0 && print_pubkey && sign_key != NULL) {
2846 if ((r = sshkey_write(sign_key, stdout)) == 0)
2847 fputc('\n', stdout);
2848 else {
2849 error_r(r, "Could not print public key.\n");
2850 ret = -1;
2851 }
2852 }
2853 sshbuf_free(sigbuf);
2854 sshbuf_free(abuf);
2855 sshkey_free(sign_key);
2856 sshkey_sig_details_free(sig_details);
2857 free(fp);
2858 return ret;
2859 }
2860
2861 static int
sig_find_principals(const char * signature,const char * allowed_keys,char * const * opts,size_t nopts)2862 sig_find_principals(const char *signature, const char *allowed_keys,
2863 char * const *opts, size_t nopts)
2864 {
2865 int r, ret = -1;
2866 struct sshbuf *sigbuf = NULL, *abuf = NULL;
2867 struct sshkey *sign_key = NULL;
2868 char *principals = NULL, *cp, *tmp;
2869 uint64_t verify_time = 0;
2870
2871 if (sig_process_opts(opts, nopts, NULL, &verify_time, NULL) != 0)
2872 goto done; /* error already logged */
2873
2874 if ((r = sshbuf_load_file(signature, &abuf)) != 0) {
2875 error_r(r, "Couldn't read signature file");
2876 goto done;
2877 }
2878 if ((r = sshsig_dearmor(abuf, &sigbuf)) != 0) {
2879 error_fr(r, "sshsig_armor");
2880 goto done;
2881 }
2882 if ((r = sshsig_get_pubkey(sigbuf, &sign_key)) != 0) {
2883 error_fr(r, "sshsig_get_pubkey");
2884 goto done;
2885 }
2886 if ((r = sshsig_find_principals(allowed_keys, sign_key,
2887 verify_time, &principals)) != 0) {
2888 if (r != SSH_ERR_KEY_NOT_FOUND)
2889 error_fr(r, "sshsig_find_principal");
2890 goto done;
2891 }
2892 ret = 0;
2893 done:
2894 if (ret == 0 ) {
2895 /* Emit matching principals one per line */
2896 tmp = principals;
2897 while ((cp = strsep(&tmp, ",")) != NULL && *cp != '\0')
2898 puts(cp);
2899 } else {
2900 fprintf(stderr, "No principal matched.\n");
2901 }
2902 sshbuf_free(sigbuf);
2903 sshbuf_free(abuf);
2904 sshkey_free(sign_key);
2905 free(principals);
2906 return ret;
2907 }
2908
2909 static int
sig_match_principals(const char * allowed_keys,char * principal,char * const * opts,size_t nopts)2910 sig_match_principals(const char *allowed_keys, char *principal,
2911 char * const *opts, size_t nopts)
2912 {
2913 int r;
2914 char **principals = NULL;
2915 size_t i, nprincipals = 0;
2916
2917 if ((r = sig_process_opts(opts, nopts, NULL, NULL, NULL)) != 0)
2918 return r; /* error already logged */
2919
2920 if ((r = sshsig_match_principals(allowed_keys, principal,
2921 &principals, &nprincipals)) != 0) {
2922 debug_f("match: %s", ssh_err(r));
2923 fprintf(stderr, "No principal matched.\n");
2924 return r;
2925 }
2926 for (i = 0; i < nprincipals; i++) {
2927 printf("%s\n", principals[i]);
2928 free(principals[i]);
2929 }
2930 free(principals);
2931
2932 return 0;
2933 }
2934
2935 static void
do_moduli_gen(const char * out_file,char ** opts,size_t nopts)2936 do_moduli_gen(const char *out_file, char **opts, size_t nopts)
2937 {
2938 #ifdef WITH_OPENSSL
2939 /* Moduli generation/screening */
2940 u_int32_t memory = 0;
2941 BIGNUM *start = NULL;
2942 int moduli_bits = 0;
2943 FILE *out;
2944 size_t i;
2945 const char *errstr;
2946
2947 /* Parse options */
2948 for (i = 0; i < nopts; i++) {
2949 if (strncmp(opts[i], "memory=", 7) == 0) {
2950 memory = (u_int32_t)strtonum(opts[i]+7, 1,
2951 UINT_MAX, &errstr);
2952 if (errstr) {
2953 fatal("Memory limit is %s: %s",
2954 errstr, opts[i]+7);
2955 }
2956 } else if (strncmp(opts[i], "start=", 6) == 0) {
2957 /* XXX - also compare length against bits */
2958 if (BN_hex2bn(&start, opts[i]+6) == 0)
2959 fatal("Invalid start point.");
2960 } else if (strncmp(opts[i], "bits=", 5) == 0) {
2961 moduli_bits = (int)strtonum(opts[i]+5, 1,
2962 INT_MAX, &errstr);
2963 if (errstr) {
2964 fatal("Invalid number: %s (%s)",
2965 opts[i]+12, errstr);
2966 }
2967 } else {
2968 fatal("Option \"%s\" is unsupported for moduli "
2969 "generation", opts[i]);
2970 }
2971 }
2972
2973 if ((out = fopen(out_file, "w")) == NULL) {
2974 fatal("Couldn't open modulus candidate file \"%s\": %s",
2975 out_file, strerror(errno));
2976 }
2977 setvbuf(out, NULL, _IOLBF, 0);
2978
2979 if (moduli_bits == 0)
2980 moduli_bits = DEFAULT_BITS;
2981 if (gen_candidates(out, memory, moduli_bits, start) != 0)
2982 fatal("modulus candidate generation failed");
2983 #else /* WITH_OPENSSL */
2984 fatal("Moduli generation is not supported");
2985 #endif /* WITH_OPENSSL */
2986 }
2987
2988 static void
do_moduli_screen(const char * out_file,char ** opts,size_t nopts)2989 do_moduli_screen(const char *out_file, char **opts, size_t nopts)
2990 {
2991 #ifdef WITH_OPENSSL
2992 /* Moduli generation/screening */
2993 char *checkpoint = NULL;
2994 u_int32_t generator_wanted = 0;
2995 unsigned long start_lineno = 0, lines_to_process = 0;
2996 int prime_tests = 0;
2997 FILE *out, *in = stdin;
2998 size_t i;
2999 const char *errstr;
3000
3001 /* Parse options */
3002 for (i = 0; i < nopts; i++) {
3003 if (strncmp(opts[i], "lines=", 6) == 0) {
3004 lines_to_process = strtoul(opts[i]+6, NULL, 10);
3005 } else if (strncmp(opts[i], "start-line=", 11) == 0) {
3006 start_lineno = strtoul(opts[i]+11, NULL, 10);
3007 } else if (strncmp(opts[i], "checkpoint=", 11) == 0) {
3008 checkpoint = xstrdup(opts[i]+11);
3009 } else if (strncmp(opts[i], "generator=", 10) == 0) {
3010 generator_wanted = (u_int32_t)strtonum(
3011 opts[i]+10, 1, UINT_MAX, &errstr);
3012 if (errstr != NULL) {
3013 fatal("Generator invalid: %s (%s)",
3014 opts[i]+10, errstr);
3015 }
3016 } else if (strncmp(opts[i], "prime-tests=", 12) == 0) {
3017 prime_tests = (int)strtonum(opts[i]+12, 1,
3018 INT_MAX, &errstr);
3019 if (errstr) {
3020 fatal("Invalid number: %s (%s)",
3021 opts[i]+12, errstr);
3022 }
3023 } else {
3024 fatal("Option \"%s\" is unsupported for moduli "
3025 "screening", opts[i]);
3026 }
3027 }
3028
3029 if (have_identity && strcmp(identity_file, "-") != 0) {
3030 if ((in = fopen(identity_file, "r")) == NULL) {
3031 fatal("Couldn't open modulus candidate "
3032 "file \"%s\": %s", identity_file,
3033 strerror(errno));
3034 }
3035 }
3036
3037 if ((out = fopen(out_file, "a")) == NULL) {
3038 fatal("Couldn't open moduli file \"%s\": %s",
3039 out_file, strerror(errno));
3040 }
3041 setvbuf(out, NULL, _IOLBF, 0);
3042 if (prime_test(in, out, prime_tests == 0 ? 100 : prime_tests,
3043 generator_wanted, checkpoint,
3044 start_lineno, lines_to_process) != 0)
3045 fatal("modulus screening failed");
3046 #else /* WITH_OPENSSL */
3047 fatal("Moduli screening is not supported");
3048 #endif /* WITH_OPENSSL */
3049 }
3050
3051 /* Read and confirm a passphrase */
3052 static char *
read_check_passphrase(const char * prompt1,const char * prompt2,const char * retry_prompt)3053 read_check_passphrase(const char *prompt1, const char *prompt2,
3054 const char *retry_prompt)
3055 {
3056 char *passphrase1, *passphrase2;
3057
3058 for (;;) {
3059 passphrase1 = read_passphrase(prompt1, RP_ALLOW_STDIN);
3060 passphrase2 = read_passphrase(prompt2, RP_ALLOW_STDIN);
3061 if (strcmp(passphrase1, passphrase2) == 0) {
3062 freezero(passphrase2, strlen(passphrase2));
3063 return passphrase1;
3064 }
3065 /* The passphrases do not match. Clear them and retry. */
3066 freezero(passphrase1, strlen(passphrase1));
3067 freezero(passphrase2, strlen(passphrase2));
3068 fputs(retry_prompt, stdout);
3069 fputc('\n', stdout);
3070 fflush(stdout);
3071 }
3072 /* NOTREACHED */
3073 return NULL;
3074 }
3075
3076 static char *
private_key_passphrase(void)3077 private_key_passphrase(void)
3078 {
3079 if (identity_passphrase)
3080 return xstrdup(identity_passphrase);
3081 if (identity_new_passphrase)
3082 return xstrdup(identity_new_passphrase);
3083
3084 return read_check_passphrase(
3085 "Enter passphrase (empty for no passphrase): ",
3086 "Enter same passphrase again: ",
3087 "Passphrases do not match. Try again.");
3088 }
3089
3090 static char *
sk_suffix(const char * application,const uint8_t * user,size_t userlen)3091 sk_suffix(const char *application, const uint8_t *user, size_t userlen)
3092 {
3093 char *ret, *cp;
3094 size_t slen, i;
3095
3096 /* Trim off URL-like preamble */
3097 if (strncmp(application, "ssh://", 6) == 0)
3098 ret = xstrdup(application + 6);
3099 else if (strncmp(application, "ssh:", 4) == 0)
3100 ret = xstrdup(application + 4);
3101 else
3102 ret = xstrdup(application);
3103
3104 /* Count trailing zeros in user */
3105 for (i = 0; i < userlen; i++) {
3106 if (user[userlen - i - 1] != 0)
3107 break;
3108 }
3109 if (i >= userlen)
3110 return ret; /* user-id was default all-zeros */
3111
3112 /* Append user-id, escaping non-UTF-8 characters */
3113 slen = userlen - i;
3114 if (asmprintf(&cp, INT_MAX, NULL, "%.*s", (int)slen, user) == -1)
3115 fatal_f("asmprintf failed");
3116 /* Don't emit a user-id that contains path or control characters */
3117 if (strchr(cp, '/') != NULL || strstr(cp, "..") != NULL ||
3118 strchr(cp, '\\') != NULL) {
3119 free(cp);
3120 cp = tohex(user, slen);
3121 }
3122 xextendf(&ret, "_", "%s", cp);
3123 free(cp);
3124 return ret;
3125 }
3126
3127 static int
do_download_sk(const char * skprovider,const char * device)3128 do_download_sk(const char *skprovider, const char *device)
3129 {
3130 struct sshsk_resident_key **srks;
3131 size_t nsrks, i;
3132 int r, ret = -1;
3133 char *fp, *pin = NULL, *pass = NULL, *path, *pubpath;
3134 const char *ext;
3135 struct sshkey *key;
3136
3137 if (skprovider == NULL)
3138 fatal("Cannot download keys without provider");
3139
3140 pin = read_passphrase("Enter PIN for authenticator: ", RP_ALLOW_STDIN);
3141 if (!quiet) {
3142 printf("You may need to touch your authenticator "
3143 "to authorize key download.\n");
3144 }
3145 if ((r = sshsk_load_resident(skprovider, device, pin, 0,
3146 &srks, &nsrks)) != 0) {
3147 if (pin != NULL)
3148 freezero(pin, strlen(pin));
3149 error_r(r, "Unable to load resident keys");
3150 return -1;
3151 }
3152 if (nsrks == 0)
3153 logit("No keys to download");
3154 if (pin != NULL)
3155 freezero(pin, strlen(pin));
3156
3157 for (i = 0; i < nsrks; i++) {
3158 key = srks[i]->key;
3159 if (key->type != KEY_ECDSA_SK && key->type != KEY_ED25519_SK) {
3160 error("Unsupported key type %s (%d)",
3161 sshkey_type(key), key->type);
3162 continue;
3163 }
3164 if ((fp = sshkey_fingerprint(key, fingerprint_hash,
3165 SSH_FP_DEFAULT)) == NULL)
3166 fatal_f("sshkey_fingerprint failed");
3167 debug_f("key %zu: %s %s %s (flags 0x%02x)", i,
3168 sshkey_type(key), fp, key->sk_application, key->sk_flags);
3169 ext = sk_suffix(key->sk_application,
3170 srks[i]->user_id, srks[i]->user_id_len);
3171 xasprintf(&path, "id_%s_rk%s%s",
3172 key->type == KEY_ECDSA_SK ? "ecdsa_sk" : "ed25519_sk",
3173 *ext == '\0' ? "" : "_", ext);
3174
3175 /* If the file already exists, ask the user to confirm. */
3176 if (!confirm_overwrite(path)) {
3177 free(path);
3178 break;
3179 }
3180
3181 /* Save the key with the application string as the comment */
3182 if (pass == NULL)
3183 pass = private_key_passphrase();
3184 if ((r = sshkey_save_private(key, path, pass,
3185 key->sk_application, private_key_format,
3186 openssh_format_cipher, rounds)) != 0) {
3187 error_r(r, "Saving key \"%s\" failed", path);
3188 free(path);
3189 break;
3190 }
3191 if (!quiet) {
3192 printf("Saved %s key%s%s to %s\n", sshkey_type(key),
3193 *ext != '\0' ? " " : "",
3194 *ext != '\0' ? key->sk_application : "",
3195 path);
3196 }
3197
3198 /* Save public key too */
3199 xasprintf(&pubpath, "%s.pub", path);
3200 free(path);
3201 if ((r = sshkey_save_public(key, pubpath,
3202 key->sk_application)) != 0) {
3203 error_r(r, "Saving public key \"%s\" failed", pubpath);
3204 free(pubpath);
3205 break;
3206 }
3207 free(pubpath);
3208 }
3209
3210 if (i >= nsrks)
3211 ret = 0; /* success */
3212 if (pass != NULL)
3213 freezero(pass, strlen(pass));
3214 sshsk_free_resident_keys(srks, nsrks);
3215 return ret;
3216 }
3217
3218 static void
save_attestation(struct sshbuf * attest,const char * path)3219 save_attestation(struct sshbuf *attest, const char *path)
3220 {
3221 mode_t omask;
3222 int r;
3223
3224 if (path == NULL)
3225 return; /* nothing to do */
3226 if (attest == NULL || sshbuf_len(attest) == 0)
3227 fatal("Enrollment did not return attestation data");
3228 omask = umask(077);
3229 r = sshbuf_write_file(path, attest);
3230 umask(omask);
3231 if (r != 0)
3232 fatal_r(r, "Unable to write attestation data \"%s\"", path);
3233 if (!quiet)
3234 printf("Your FIDO attestation certificate has been saved in "
3235 "%s\n", path);
3236 }
3237
3238 static int
confirm_sk_overwrite(const char * application,const char * user)3239 confirm_sk_overwrite(const char *application, const char *user)
3240 {
3241 char yesno[3];
3242
3243 printf("A resident key scoped to '%s' with user id '%s' already "
3244 "exists.\n", application == NULL ? "ssh:" : application,
3245 user == NULL ? "null" : user);
3246 printf("Overwrite key in token (y/n)? ");
3247 fflush(stdout);
3248 if (fgets(yesno, sizeof(yesno), stdin) == NULL)
3249 return 0;
3250 if (yesno[0] != 'y' && yesno[0] != 'Y')
3251 return 0;
3252 return 1;
3253 }
3254
3255 static void
usage(void)3256 usage(void)
3257 {
3258 fprintf(stderr,
3259 "usage: ssh-keygen [-q] [-a rounds] [-b bits] [-C comment] [-f output_keyfile]\n"
3260 " [-m format] [-N new_passphrase] [-O option]\n"
3261 " [-t dsa | ecdsa | ecdsa-sk | ed25519 | ed25519-sk | rsa]\n"
3262 " [-w provider] [-Z cipher]\n"
3263 " ssh-keygen -p [-a rounds] [-f keyfile] [-m format] [-N new_passphrase]\n"
3264 " [-P old_passphrase] [-Z cipher]\n"
3265 #ifdef WITH_OPENSSL
3266 " ssh-keygen -i [-f input_keyfile] [-m key_format]\n"
3267 " ssh-keygen -e [-f input_keyfile] [-m key_format]\n"
3268 #endif
3269 " ssh-keygen -y [-f input_keyfile]\n"
3270 " ssh-keygen -c [-a rounds] [-C comment] [-f keyfile] [-P passphrase]\n"
3271 " ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]\n"
3272 " ssh-keygen -B [-f input_keyfile]\n");
3273 #ifdef ENABLE_PKCS11
3274 fprintf(stderr,
3275 " ssh-keygen -D pkcs11\n");
3276 #endif
3277 fprintf(stderr,
3278 " ssh-keygen -F hostname [-lv] [-f known_hosts_file]\n"
3279 " ssh-keygen -H [-f known_hosts_file]\n"
3280 " ssh-keygen -K [-a rounds] [-w provider]\n"
3281 " ssh-keygen -R hostname [-f known_hosts_file]\n"
3282 " ssh-keygen -r hostname [-g] [-f input_keyfile]\n"
3283 #ifdef WITH_OPENSSL
3284 " ssh-keygen -M generate [-O option] output_file\n"
3285 " ssh-keygen -M screen [-f input_file] [-O option] output_file\n"
3286 #endif
3287 " ssh-keygen -I certificate_identity -s ca_key [-hU] [-D pkcs11_provider]\n"
3288 " [-n principals] [-O option] [-V validity_interval]\n"
3289 " [-z serial_number] file ...\n"
3290 " ssh-keygen -L [-f input_keyfile]\n"
3291 " ssh-keygen -A [-a rounds] [-f prefix_path]\n"
3292 " ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number]\n"
3293 " file ...\n"
3294 " ssh-keygen -Q [-l] -f krl_file [file ...]\n"
3295 " ssh-keygen -Y find-principals -s signature_file -f allowed_signers_file\n"
3296 " ssh-keygen -Y match-principals -I signer_identity -f allowed_signers_file\n"
3297 " ssh-keygen -Y check-novalidate -n namespace -s signature_file\n"
3298 " ssh-keygen -Y sign -f key_file -n namespace file [-O option] ...\n"
3299 " ssh-keygen -Y verify -f allowed_signers_file -I signer_identity\n"
3300 " -n namespace -s signature_file [-r krl_file] [-O option]\n");
3301 exit(1);
3302 }
3303
3304 /*
3305 * Main program for key management.
3306 */
3307 int
main(int argc,char ** argv)3308 main(int argc, char **argv)
3309 {
3310 char comment[1024], *passphrase = NULL;
3311 char *rr_hostname = NULL, *ep, *fp, *ra;
3312 struct sshkey *private, *public;
3313 struct passwd *pw;
3314 int r, opt, type;
3315 int change_passphrase = 0, change_comment = 0, show_cert = 0;
3316 int find_host = 0, delete_host = 0, hash_hosts = 0;
3317 int gen_all_hostkeys = 0, gen_krl = 0, update_krl = 0, check_krl = 0;
3318 int prefer_agent = 0, convert_to = 0, convert_from = 0;
3319 int print_public = 0, print_generic = 0, cert_serial_autoinc = 0;
3320 int do_gen_candidates = 0, do_screen_candidates = 0, download_sk = 0;
3321 unsigned long long cert_serial = 0;
3322 char *identity_comment = NULL, *ca_key_path = NULL, **opts = NULL;
3323 char *sk_application = NULL, *sk_device = NULL, *sk_user = NULL;
3324 char *sk_attestation_path = NULL;
3325 struct sshbuf *challenge = NULL, *attest = NULL;
3326 size_t i, nopts = 0;
3327 u_int32_t bits = 0;
3328 uint8_t sk_flags = SSH_SK_USER_PRESENCE_REQD;
3329 const char *errstr;
3330 int log_level = SYSLOG_LEVEL_INFO;
3331 char *sign_op = NULL;
3332
3333 extern int optind;
3334 extern char *optarg;
3335
3336 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
3337 sanitise_stdfd();
3338
3339 __progname = ssh_get_progname(argv[0]);
3340
3341 seed_rng();
3342
3343 log_init(argv[0], SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_USER, 1);
3344
3345 msetlocale();
3346
3347 /* we need this for the home * directory. */
3348 pw = getpwuid(getuid());
3349 if (!pw)
3350 fatal("No user exists for uid %lu", (u_long)getuid());
3351 pw = pwcopy(pw);
3352 if (gethostname(hostname, sizeof(hostname)) == -1)
3353 fatal("gethostname: %s", strerror(errno));
3354
3355 sk_provider = getenv("SSH_SK_PROVIDER");
3356
3357 /* Remaining characters: dGjJSTWx */
3358 while ((opt = getopt(argc, argv, "ABHKLQUXceghiklopquvy"
3359 "C:D:E:F:I:M:N:O:P:R:V:Y:Z:"
3360 "a:b:f:g:m:n:r:s:t:w:z:")) != -1) {
3361 switch (opt) {
3362 case 'A':
3363 gen_all_hostkeys = 1;
3364 break;
3365 case 'b':
3366 bits = (u_int32_t)strtonum(optarg, 1, UINT32_MAX,
3367 &errstr);
3368 if (errstr)
3369 fatal("Bits has bad value %s (%s)",
3370 optarg, errstr);
3371 break;
3372 case 'E':
3373 fingerprint_hash = ssh_digest_alg_by_name(optarg);
3374 if (fingerprint_hash == -1)
3375 fatal("Invalid hash algorithm \"%s\"", optarg);
3376 break;
3377 case 'F':
3378 find_host = 1;
3379 rr_hostname = optarg;
3380 break;
3381 case 'H':
3382 hash_hosts = 1;
3383 break;
3384 case 'I':
3385 cert_key_id = optarg;
3386 break;
3387 case 'R':
3388 delete_host = 1;
3389 rr_hostname = optarg;
3390 break;
3391 case 'L':
3392 show_cert = 1;
3393 break;
3394 case 'l':
3395 print_fingerprint = 1;
3396 break;
3397 case 'B':
3398 print_bubblebabble = 1;
3399 break;
3400 case 'm':
3401 if (strcasecmp(optarg, "RFC4716") == 0 ||
3402 strcasecmp(optarg, "ssh2") == 0) {
3403 convert_format = FMT_RFC4716;
3404 break;
3405 }
3406 if (strcasecmp(optarg, "PKCS8") == 0) {
3407 convert_format = FMT_PKCS8;
3408 private_key_format = SSHKEY_PRIVATE_PKCS8;
3409 break;
3410 }
3411 if (strcasecmp(optarg, "PEM") == 0) {
3412 convert_format = FMT_PEM;
3413 private_key_format = SSHKEY_PRIVATE_PEM;
3414 break;
3415 }
3416 fatal("Unsupported conversion format \"%s\"", optarg);
3417 case 'n':
3418 cert_principals = optarg;
3419 break;
3420 case 'o':
3421 /* no-op; new format is already the default */
3422 break;
3423 case 'p':
3424 change_passphrase = 1;
3425 break;
3426 case 'c':
3427 change_comment = 1;
3428 break;
3429 case 'f':
3430 if (strlcpy(identity_file, optarg,
3431 sizeof(identity_file)) >= sizeof(identity_file))
3432 fatal("Identity filename too long");
3433 have_identity = 1;
3434 break;
3435 case 'g':
3436 print_generic = 1;
3437 break;
3438 case 'K':
3439 download_sk = 1;
3440 break;
3441 case 'P':
3442 identity_passphrase = optarg;
3443 break;
3444 case 'N':
3445 identity_new_passphrase = optarg;
3446 break;
3447 case 'Q':
3448 check_krl = 1;
3449 break;
3450 case 'O':
3451 opts = xrecallocarray(opts, nopts, nopts + 1,
3452 sizeof(*opts));
3453 opts[nopts++] = xstrdup(optarg);
3454 break;
3455 case 'Z':
3456 openssh_format_cipher = optarg;
3457 if (cipher_by_name(openssh_format_cipher) == NULL)
3458 fatal("Invalid OpenSSH-format cipher '%s'",
3459 openssh_format_cipher);
3460 break;
3461 case 'C':
3462 identity_comment = optarg;
3463 break;
3464 case 'q':
3465 quiet = 1;
3466 break;
3467 case 'e':
3468 /* export key */
3469 convert_to = 1;
3470 break;
3471 case 'h':
3472 cert_key_type = SSH2_CERT_TYPE_HOST;
3473 certflags_flags = 0;
3474 break;
3475 case 'k':
3476 gen_krl = 1;
3477 break;
3478 case 'i':
3479 case 'X':
3480 /* import key */
3481 convert_from = 1;
3482 break;
3483 case 'y':
3484 print_public = 1;
3485 break;
3486 case 's':
3487 ca_key_path = optarg;
3488 break;
3489 case 't':
3490 key_type_name = optarg;
3491 break;
3492 case 'D':
3493 pkcs11provider = optarg;
3494 break;
3495 case 'U':
3496 prefer_agent = 1;
3497 break;
3498 case 'u':
3499 update_krl = 1;
3500 break;
3501 case 'v':
3502 if (log_level == SYSLOG_LEVEL_INFO)
3503 log_level = SYSLOG_LEVEL_DEBUG1;
3504 else {
3505 if (log_level >= SYSLOG_LEVEL_DEBUG1 &&
3506 log_level < SYSLOG_LEVEL_DEBUG3)
3507 log_level++;
3508 }
3509 break;
3510 case 'r':
3511 rr_hostname = optarg;
3512 break;
3513 case 'a':
3514 rounds = (int)strtonum(optarg, 1, INT_MAX, &errstr);
3515 if (errstr)
3516 fatal("Invalid number: %s (%s)",
3517 optarg, errstr);
3518 break;
3519 case 'V':
3520 parse_cert_times(optarg);
3521 break;
3522 case 'Y':
3523 sign_op = optarg;
3524 break;
3525 case 'w':
3526 sk_provider = optarg;
3527 break;
3528 case 'z':
3529 errno = 0;
3530 if (*optarg == '+') {
3531 cert_serial_autoinc = 1;
3532 optarg++;
3533 }
3534 cert_serial = strtoull(optarg, &ep, 10);
3535 if (*optarg < '0' || *optarg > '9' || *ep != '\0' ||
3536 (errno == ERANGE && cert_serial == ULLONG_MAX))
3537 fatal("Invalid serial number \"%s\"", optarg);
3538 break;
3539 case 'M':
3540 if (strcmp(optarg, "generate") == 0)
3541 do_gen_candidates = 1;
3542 else if (strcmp(optarg, "screen") == 0)
3543 do_screen_candidates = 1;
3544 else
3545 fatal("Unsupported moduli option %s", optarg);
3546 break;
3547 case '?':
3548 default:
3549 usage();
3550 }
3551 }
3552
3553 #ifdef ENABLE_SK_INTERNAL
3554 if (sk_provider == NULL)
3555 sk_provider = "internal";
3556 #endif
3557
3558 /* reinit */
3559 log_init(argv[0], log_level, SYSLOG_FACILITY_USER, 1);
3560
3561 argv += optind;
3562 argc -= optind;
3563
3564 if (sign_op != NULL) {
3565 if (strncmp(sign_op, "find-principals", 15) == 0) {
3566 if (ca_key_path == NULL) {
3567 error("Too few arguments for find-principals:"
3568 "missing signature file");
3569 exit(1);
3570 }
3571 if (!have_identity) {
3572 error("Too few arguments for find-principals:"
3573 "missing allowed keys file");
3574 exit(1);
3575 }
3576 return sig_find_principals(ca_key_path, identity_file,
3577 opts, nopts);
3578 } else if (strncmp(sign_op, "match-principals", 16) == 0) {
3579 if (!have_identity) {
3580 error("Too few arguments for match-principals:"
3581 "missing allowed keys file");
3582 exit(1);
3583 }
3584 if (cert_key_id == NULL) {
3585 error("Too few arguments for match-principals: "
3586 "missing principal ID");
3587 exit(1);
3588 }
3589 return sig_match_principals(identity_file, cert_key_id,
3590 opts, nopts);
3591 } else if (strncmp(sign_op, "sign", 4) == 0) {
3592 /* NB. cert_principals is actually namespace, via -n */
3593 if (cert_principals == NULL ||
3594 *cert_principals == '\0') {
3595 error("Too few arguments for sign: "
3596 "missing namespace");
3597 exit(1);
3598 }
3599 if (!have_identity) {
3600 error("Too few arguments for sign: "
3601 "missing key");
3602 exit(1);
3603 }
3604 return sig_sign(identity_file, cert_principals,
3605 prefer_agent, argc, argv, opts, nopts);
3606 } else if (strncmp(sign_op, "check-novalidate", 16) == 0) {
3607 /* NB. cert_principals is actually namespace, via -n */
3608 if (cert_principals == NULL ||
3609 *cert_principals == '\0') {
3610 error("Too few arguments for check-novalidate: "
3611 "missing namespace");
3612 exit(1);
3613 }
3614 if (ca_key_path == NULL) {
3615 error("Too few arguments for check-novalidate: "
3616 "missing signature file");
3617 exit(1);
3618 }
3619 return sig_verify(ca_key_path, cert_principals,
3620 NULL, NULL, NULL, opts, nopts);
3621 } else if (strncmp(sign_op, "verify", 6) == 0) {
3622 /* NB. cert_principals is actually namespace, via -n */
3623 if (cert_principals == NULL ||
3624 *cert_principals == '\0') {
3625 error("Too few arguments for verify: "
3626 "missing namespace");
3627 exit(1);
3628 }
3629 if (ca_key_path == NULL) {
3630 error("Too few arguments for verify: "
3631 "missing signature file");
3632 exit(1);
3633 }
3634 if (!have_identity) {
3635 error("Too few arguments for sign: "
3636 "missing allowed keys file");
3637 exit(1);
3638 }
3639 if (cert_key_id == NULL) {
3640 error("Too few arguments for verify: "
3641 "missing principal identity");
3642 exit(1);
3643 }
3644 return sig_verify(ca_key_path, cert_principals,
3645 cert_key_id, identity_file, rr_hostname,
3646 opts, nopts);
3647 }
3648 error("Unsupported operation for -Y: \"%s\"", sign_op);
3649 usage();
3650 /* NOTREACHED */
3651 }
3652
3653 if (ca_key_path != NULL) {
3654 if (argc < 1 && !gen_krl) {
3655 error("Too few arguments.");
3656 usage();
3657 }
3658 } else if (argc > 0 && !gen_krl && !check_krl &&
3659 !do_gen_candidates && !do_screen_candidates) {
3660 error("Too many arguments.");
3661 usage();
3662 }
3663 if (change_passphrase && change_comment) {
3664 error("Can only have one of -p and -c.");
3665 usage();
3666 }
3667 if (print_fingerprint && (delete_host || hash_hosts)) {
3668 error("Cannot use -l with -H or -R.");
3669 usage();
3670 }
3671 if (gen_krl) {
3672 do_gen_krl(pw, update_krl, ca_key_path,
3673 cert_serial, identity_comment, argc, argv);
3674 return (0);
3675 }
3676 if (check_krl) {
3677 do_check_krl(pw, print_fingerprint, argc, argv);
3678 return (0);
3679 }
3680 if (ca_key_path != NULL) {
3681 if (cert_key_id == NULL)
3682 fatal("Must specify key id (-I) when certifying");
3683 for (i = 0; i < nopts; i++)
3684 add_cert_option(opts[i]);
3685 do_ca_sign(pw, ca_key_path, prefer_agent,
3686 cert_serial, cert_serial_autoinc, argc, argv);
3687 }
3688 if (show_cert)
3689 do_show_cert(pw);
3690 if (delete_host || hash_hosts || find_host) {
3691 do_known_hosts(pw, rr_hostname, find_host,
3692 delete_host, hash_hosts);
3693 }
3694 if (pkcs11provider != NULL)
3695 do_download(pw);
3696 if (download_sk) {
3697 for (i = 0; i < nopts; i++) {
3698 if (strncasecmp(opts[i], "device=", 7) == 0) {
3699 sk_device = xstrdup(opts[i] + 7);
3700 } else {
3701 fatal("Option \"%s\" is unsupported for "
3702 "FIDO authenticator download", opts[i]);
3703 }
3704 }
3705 return do_download_sk(sk_provider, sk_device);
3706 }
3707 if (print_fingerprint || print_bubblebabble)
3708 do_fingerprint(pw);
3709 if (change_passphrase)
3710 do_change_passphrase(pw);
3711 if (change_comment)
3712 do_change_comment(pw, identity_comment);
3713 #ifdef WITH_OPENSSL
3714 if (convert_to)
3715 do_convert_to(pw);
3716 if (convert_from)
3717 do_convert_from(pw);
3718 #else /* WITH_OPENSSL */
3719 if (convert_to || convert_from)
3720 fatal("key conversion disabled at compile time");
3721 #endif /* WITH_OPENSSL */
3722 if (print_public)
3723 do_print_public(pw);
3724 if (rr_hostname != NULL) {
3725 unsigned int n = 0;
3726
3727 if (have_identity) {
3728 n = do_print_resource_record(pw, identity_file,
3729 rr_hostname, print_generic);
3730 if (n == 0)
3731 fatal("%s: %s", identity_file, strerror(errno));
3732 exit(0);
3733 } else {
3734
3735 n += do_print_resource_record(pw,
3736 _PATH_HOST_RSA_KEY_FILE, rr_hostname,
3737 print_generic);
3738 n += do_print_resource_record(pw,
3739 _PATH_HOST_DSA_KEY_FILE, rr_hostname,
3740 print_generic);
3741 n += do_print_resource_record(pw,
3742 _PATH_HOST_ECDSA_KEY_FILE, rr_hostname,
3743 print_generic);
3744 n += do_print_resource_record(pw,
3745 _PATH_HOST_ED25519_KEY_FILE, rr_hostname,
3746 print_generic);
3747 n += do_print_resource_record(pw,
3748 _PATH_HOST_XMSS_KEY_FILE, rr_hostname,
3749 print_generic);
3750 if (n == 0)
3751 fatal("no keys found.");
3752 exit(0);
3753 }
3754 }
3755
3756 if (do_gen_candidates || do_screen_candidates) {
3757 if (argc <= 0)
3758 fatal("No output file specified");
3759 else if (argc > 1)
3760 fatal("Too many output files specified");
3761 }
3762 if (do_gen_candidates) {
3763 do_moduli_gen(argv[0], opts, nopts);
3764 return 0;
3765 }
3766 if (do_screen_candidates) {
3767 do_moduli_screen(argv[0], opts, nopts);
3768 return 0;
3769 }
3770
3771 if (gen_all_hostkeys) {
3772 do_gen_all_hostkeys(pw);
3773 return (0);
3774 }
3775
3776 if (key_type_name == NULL)
3777 key_type_name = DEFAULT_KEY_TYPE_NAME;
3778
3779 type = sshkey_type_from_name(key_type_name);
3780 type_bits_valid(type, key_type_name, &bits);
3781
3782 if (!quiet)
3783 printf("Generating public/private %s key pair.\n",
3784 key_type_name);
3785 switch (type) {
3786 case KEY_ECDSA_SK:
3787 case KEY_ED25519_SK:
3788 for (i = 0; i < nopts; i++) {
3789 if (strcasecmp(opts[i], "no-touch-required") == 0) {
3790 sk_flags &= ~SSH_SK_USER_PRESENCE_REQD;
3791 } else if (strcasecmp(opts[i], "verify-required") == 0) {
3792 sk_flags |= SSH_SK_USER_VERIFICATION_REQD;
3793 } else if (strcasecmp(opts[i], "resident") == 0) {
3794 sk_flags |= SSH_SK_RESIDENT_KEY;
3795 } else if (strncasecmp(opts[i], "device=", 7) == 0) {
3796 sk_device = xstrdup(opts[i] + 7);
3797 } else if (strncasecmp(opts[i], "user=", 5) == 0) {
3798 sk_user = xstrdup(opts[i] + 5);
3799 } else if (strncasecmp(opts[i], "challenge=", 10) == 0) {
3800 if ((r = sshbuf_load_file(opts[i] + 10,
3801 &challenge)) != 0) {
3802 fatal_r(r, "Unable to load FIDO "
3803 "enrollment challenge \"%s\"",
3804 opts[i] + 10);
3805 }
3806 } else if (strncasecmp(opts[i],
3807 "write-attestation=", 18) == 0) {
3808 sk_attestation_path = opts[i] + 18;
3809 } else if (strncasecmp(opts[i],
3810 "application=", 12) == 0) {
3811 sk_application = xstrdup(opts[i] + 12);
3812 if (strncmp(sk_application, "ssh:", 4) != 0) {
3813 fatal("FIDO application string must "
3814 "begin with \"ssh:\"");
3815 }
3816 } else {
3817 fatal("Option \"%s\" is unsupported for "
3818 "FIDO authenticator enrollment", opts[i]);
3819 }
3820 }
3821 if ((attest = sshbuf_new()) == NULL)
3822 fatal("sshbuf_new failed");
3823 r = 0;
3824 for (i = 0 ;;) {
3825 if (!quiet) {
3826 printf("You may need to touch your "
3827 "authenticator%s to authorize key "
3828 "generation.\n",
3829 r == 0 ? "" : " again");
3830 }
3831 fflush(stdout);
3832 r = sshsk_enroll(type, sk_provider, sk_device,
3833 sk_application == NULL ? "ssh:" : sk_application,
3834 sk_user, sk_flags, passphrase, challenge,
3835 &private, attest);
3836 if (r == 0)
3837 break;
3838 if (r == SSH_ERR_KEY_BAD_PERMISSIONS &&
3839 (sk_flags & SSH_SK_RESIDENT_KEY) != 0 &&
3840 (sk_flags & SSH_SK_FORCE_OPERATION) == 0 &&
3841 confirm_sk_overwrite(sk_application, sk_user)) {
3842 sk_flags |= SSH_SK_FORCE_OPERATION;
3843 continue;
3844 }
3845 if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
3846 fatal_r(r, "Key enrollment failed");
3847 else if (passphrase != NULL) {
3848 error("PIN incorrect");
3849 freezero(passphrase, strlen(passphrase));
3850 passphrase = NULL;
3851 }
3852 if (++i >= 3)
3853 fatal("Too many incorrect PINs");
3854 passphrase = read_passphrase("Enter PIN for "
3855 "authenticator: ", RP_ALLOW_STDIN);
3856 }
3857 if (passphrase != NULL) {
3858 freezero(passphrase, strlen(passphrase));
3859 passphrase = NULL;
3860 }
3861 break;
3862 default:
3863 if ((r = sshkey_generate(type, bits, &private)) != 0)
3864 fatal("sshkey_generate failed");
3865 break;
3866 }
3867 if ((r = sshkey_from_private(private, &public)) != 0)
3868 fatal_r(r, "sshkey_from_private");
3869
3870 if (!have_identity)
3871 ask_filename(pw, "Enter file in which to save the key");
3872
3873 /* Create ~/.ssh directory if it doesn't already exist. */
3874 hostfile_create_user_ssh_dir(identity_file, !quiet);
3875
3876 /* If the file already exists, ask the user to confirm. */
3877 if (!confirm_overwrite(identity_file))
3878 exit(1);
3879
3880 /* Determine the passphrase for the private key */
3881 passphrase = private_key_passphrase();
3882 if (identity_comment) {
3883 strlcpy(comment, identity_comment, sizeof(comment));
3884 } else {
3885 /* Create default comment field for the passphrase. */
3886 snprintf(comment, sizeof comment, "%s@%s", pw->pw_name, hostname);
3887 }
3888
3889 /* Save the key with the given passphrase and comment. */
3890 if ((r = sshkey_save_private(private, identity_file, passphrase,
3891 comment, private_key_format, openssh_format_cipher, rounds)) != 0) {
3892 error_r(r, "Saving key \"%s\" failed", identity_file);
3893 freezero(passphrase, strlen(passphrase));
3894 exit(1);
3895 }
3896 freezero(passphrase, strlen(passphrase));
3897 sshkey_free(private);
3898
3899 if (!quiet) {
3900 printf("Your identification has been saved in %s\n",
3901 identity_file);
3902 }
3903
3904 strlcat(identity_file, ".pub", sizeof(identity_file));
3905 if ((r = sshkey_save_public(public, identity_file, comment)) != 0)
3906 fatal_r(r, "Unable to save public key to %s", identity_file);
3907
3908 if (!quiet) {
3909 fp = sshkey_fingerprint(public, fingerprint_hash,
3910 SSH_FP_DEFAULT);
3911 ra = sshkey_fingerprint(public, fingerprint_hash,
3912 SSH_FP_RANDOMART);
3913 if (fp == NULL || ra == NULL)
3914 fatal("sshkey_fingerprint failed");
3915 printf("Your public key has been saved in %s\n",
3916 identity_file);
3917 printf("The key fingerprint is:\n");
3918 printf("%s %s\n", fp, comment);
3919 printf("The key's randomart image is:\n");
3920 printf("%s\n", ra);
3921 free(ra);
3922 free(fp);
3923 }
3924
3925 if (sk_attestation_path != NULL)
3926 save_attestation(attest, sk_attestation_path);
3927
3928 sshbuf_free(attest);
3929 sshkey_free(public);
3930
3931 exit(0);
3932 }
3933