xref: /openssh-portable/ssh-add.c (revision 42c5ec4b)
1 /* $OpenBSD: ssh-add.c,v 1.136 2018/09/19 02:03:02 djm Exp $ */
2 /*
3  * Author: Tatu Ylonen <ylo@cs.hut.fi>
4  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5  *                    All rights reserved
6  * Adds an identity to the authentication server, or removes an identity.
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  * SSH2 implementation,
15  * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
16  *
17  * Redistribution and use in source and binary forms, with or without
18  * modification, are permitted provided that the following conditions
19  * are met:
20  * 1. Redistributions of source code must retain the above copyright
21  *    notice, this list of conditions and the following disclaimer.
22  * 2. Redistributions in binary form must reproduce the above copyright
23  *    notice, this list of conditions and the following disclaimer in the
24  *    documentation and/or other materials provided with the distribution.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include "includes.h"
39 
40 #include <sys/types.h>
41 #include <sys/stat.h>
42 
43 #include <openssl/evp.h>
44 #include "openbsd-compat/openssl-compat.h"
45 
46 #include <errno.h>
47 #include <fcntl.h>
48 #include <pwd.h>
49 #include <stdarg.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 #include <limits.h>
55 
56 #include "xmalloc.h"
57 #include "ssh.h"
58 #include "log.h"
59 #include "sshkey.h"
60 #include "sshbuf.h"
61 #include "authfd.h"
62 #include "authfile.h"
63 #include "pathnames.h"
64 #include "misc.h"
65 #include "ssherr.h"
66 #include "digest.h"
67 
68 /* argv0 */
69 extern char *__progname;
70 
71 /* Default files to add */
72 static char *default_files[] = {
73 #ifdef WITH_OPENSSL
74 	_PATH_SSH_CLIENT_ID_RSA,
75 	_PATH_SSH_CLIENT_ID_DSA,
76 #ifdef OPENSSL_HAS_ECC
77 	_PATH_SSH_CLIENT_ID_ECDSA,
78 #endif
79 #endif /* WITH_OPENSSL */
80 	_PATH_SSH_CLIENT_ID_ED25519,
81 	_PATH_SSH_CLIENT_ID_XMSS,
82 	NULL
83 };
84 
85 static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
86 
87 /* Default lifetime (0 == forever) */
88 static int lifetime = 0;
89 
90 /* User has to confirm key use */
91 static int confirm = 0;
92 
93 /* Maximum number of signatures (XMSS) */
94 static u_int maxsign = 0;
95 static u_int minleft = 0;
96 
97 /* we keep a cache of one passphrase */
98 static char *pass = NULL;
99 static void
100 clear_pass(void)
101 {
102 	if (pass) {
103 		explicit_bzero(pass, strlen(pass));
104 		free(pass);
105 		pass = NULL;
106 	}
107 }
108 
109 static int
110 delete_file(int agent_fd, const char *filename, int key_only, int qflag)
111 {
112 	struct sshkey *public, *cert = NULL;
113 	char *certpath = NULL, *comment = NULL;
114 	int r, ret = -1;
115 
116 	if ((r = sshkey_load_public(filename, &public,  &comment)) != 0) {
117 		printf("Bad key file %s: %s\n", filename, ssh_err(r));
118 		return -1;
119 	}
120 	if ((r = ssh_remove_identity(agent_fd, public)) == 0) {
121 		if (!qflag) {
122 			fprintf(stderr, "Identity removed: %s (%s)\n",
123 			    filename, comment);
124 		}
125 		ret = 0;
126 	} else
127 		fprintf(stderr, "Could not remove identity \"%s\": %s\n",
128 		    filename, ssh_err(r));
129 
130 	if (key_only)
131 		goto out;
132 
133 	/* Now try to delete the corresponding certificate too */
134 	free(comment);
135 	comment = NULL;
136 	xasprintf(&certpath, "%s-cert.pub", filename);
137 	if ((r = sshkey_load_public(certpath, &cert, &comment)) != 0) {
138 		if (r != SSH_ERR_SYSTEM_ERROR || errno != ENOENT)
139 			error("Failed to load certificate \"%s\": %s",
140 			    certpath, ssh_err(r));
141 		goto out;
142 	}
143 
144 	if (!sshkey_equal_public(cert, public))
145 		fatal("Certificate %s does not match private key %s",
146 		    certpath, filename);
147 
148 	if ((r = ssh_remove_identity(agent_fd, cert)) == 0) {
149 		if (!qflag) {
150 			fprintf(stderr, "Identity removed: %s (%s)\n",
151 			    certpath, comment);
152 		}
153 		ret = 0;
154 	} else
155 		fprintf(stderr, "Could not remove identity \"%s\": %s\n",
156 		    certpath, ssh_err(r));
157 
158  out:
159 	sshkey_free(cert);
160 	sshkey_free(public);
161 	free(certpath);
162 	free(comment);
163 
164 	return ret;
165 }
166 
167 /* Send a request to remove all identities. */
168 static int
169 delete_all(int agent_fd, int qflag)
170 {
171 	int ret = -1;
172 
173 	/*
174 	 * Since the agent might be forwarded, old or non-OpenSSH, when asked
175 	 * to remove all keys, attempt to remove both protocol v.1 and v.2
176 	 * keys.
177 	 */
178 	if (ssh_remove_all_identities(agent_fd, 2) == 0)
179 		ret = 0;
180 	/* ignore error-code for ssh1 */
181 	ssh_remove_all_identities(agent_fd, 1);
182 
183 	if (ret != 0)
184 		fprintf(stderr, "Failed to remove all identities.\n");
185 	else if (!qflag)
186 		fprintf(stderr, "All identities removed.\n");
187 
188 	return ret;
189 }
190 
191 static int
192 add_file(int agent_fd, const char *filename, int key_only, int qflag)
193 {
194 	struct sshkey *private, *cert;
195 	char *comment = NULL;
196 	char msg[1024], *certpath = NULL;
197 	int r, fd, ret = -1;
198 	size_t i;
199 	u_int32_t left;
200 	struct sshbuf *keyblob;
201 	struct ssh_identitylist *idlist;
202 
203 	if (strcmp(filename, "-") == 0) {
204 		fd = STDIN_FILENO;
205 		filename = "(stdin)";
206 	} else if ((fd = open(filename, O_RDONLY)) < 0) {
207 		perror(filename);
208 		return -1;
209 	}
210 
211 	/*
212 	 * Since we'll try to load a keyfile multiple times, permission errors
213 	 * will occur multiple times, so check perms first and bail if wrong.
214 	 */
215 	if (fd != STDIN_FILENO) {
216 		if (sshkey_perm_ok(fd, filename) != 0) {
217 			close(fd);
218 			return -1;
219 		}
220 	}
221 	if ((keyblob = sshbuf_new()) == NULL)
222 		fatal("%s: sshbuf_new failed", __func__);
223 	if ((r = sshkey_load_file(fd, keyblob)) != 0) {
224 		fprintf(stderr, "Error loading key \"%s\": %s\n",
225 		    filename, ssh_err(r));
226 		sshbuf_free(keyblob);
227 		close(fd);
228 		return -1;
229 	}
230 	close(fd);
231 
232 	/* At first, try empty passphrase */
233 	if ((r = sshkey_parse_private_fileblob(keyblob, "", &private,
234 	    &comment)) != 0 && r != SSH_ERR_KEY_WRONG_PASSPHRASE) {
235 		fprintf(stderr, "Error loading key \"%s\": %s\n",
236 		    filename, ssh_err(r));
237 		goto fail_load;
238 	}
239 	/* try last */
240 	if (private == NULL && pass != NULL) {
241 		if ((r = sshkey_parse_private_fileblob(keyblob, pass, &private,
242 		    &comment)) != 0 && r != SSH_ERR_KEY_WRONG_PASSPHRASE) {
243 			fprintf(stderr, "Error loading key \"%s\": %s\n",
244 			    filename, ssh_err(r));
245 			goto fail_load;
246 		}
247 	}
248 	if (private == NULL) {
249 		/* clear passphrase since it did not work */
250 		clear_pass();
251 		snprintf(msg, sizeof msg, "Enter passphrase for %s%s: ",
252 		    filename, confirm ? " (will confirm each use)" : "");
253 		for (;;) {
254 			pass = read_passphrase(msg, RP_ALLOW_STDIN);
255 			if (strcmp(pass, "") == 0)
256 				goto fail_load;
257 			if ((r = sshkey_parse_private_fileblob(keyblob, pass,
258 			    &private, &comment)) == 0)
259 				break;
260 			else if (r != SSH_ERR_KEY_WRONG_PASSPHRASE) {
261 				fprintf(stderr,
262 				    "Error loading key \"%s\": %s\n",
263 				    filename, ssh_err(r));
264  fail_load:
265 				clear_pass();
266 				sshbuf_free(keyblob);
267 				return -1;
268 			}
269 			clear_pass();
270 			snprintf(msg, sizeof msg,
271 			    "Bad passphrase, try again for %s%s: ", filename,
272 			    confirm ? " (will confirm each use)" : "");
273 		}
274 	}
275 	if (comment == NULL || *comment == '\0')
276 		comment = xstrdup(filename);
277 	sshbuf_free(keyblob);
278 
279 	/* For XMSS */
280 	if ((r = sshkey_set_filename(private, filename)) != 0) {
281 		fprintf(stderr, "Could not add filename to private key: %s (%s)\n",
282 		    filename, comment);
283 		goto out;
284 	}
285 	if (maxsign && minleft &&
286 	    (r = ssh_fetch_identitylist(agent_fd, &idlist)) == 0) {
287 		for (i = 0; i < idlist->nkeys; i++) {
288 			if (!sshkey_equal_public(idlist->keys[i], private))
289 				continue;
290 			left = sshkey_signatures_left(idlist->keys[i]);
291 			if (left < minleft) {
292 				fprintf(stderr,
293 				    "Only %d signatures left.\n", left);
294 				break;
295 			}
296 			fprintf(stderr, "Skipping update: ");
297 			if (left == minleft) {
298 				fprintf(stderr,
299 				   "required signatures left (%d).\n", left);
300 			} else {
301 				fprintf(stderr,
302 				   "more signatures left (%d) than"
303 				    " required (%d).\n", left, minleft);
304 			}
305 			ssh_free_identitylist(idlist);
306 			goto out;
307 		}
308 		ssh_free_identitylist(idlist);
309 	}
310 
311 	if ((r = ssh_add_identity_constrained(agent_fd, private, comment,
312 	    lifetime, confirm, maxsign)) == 0) {
313 		ret = 0;
314 		if (!qflag) {
315 			fprintf(stderr, "Identity added: %s (%s)\n",
316 			    filename, comment);
317 			if (lifetime != 0) {
318 				fprintf(stderr,
319 				    "Lifetime set to %d seconds\n", lifetime);
320 			}
321 			if (confirm != 0) {
322 				fprintf(stderr, "The user must confirm "
323 				    "each use of the key\n");
324 			}
325 		}
326 	} else {
327 		fprintf(stderr, "Could not add identity \"%s\": %s\n",
328 		    filename, ssh_err(r));
329 	}
330 
331 	/* Skip trying to load the cert if requested */
332 	if (key_only)
333 		goto out;
334 
335 	/* Now try to add the certificate flavour too */
336 	xasprintf(&certpath, "%s-cert.pub", filename);
337 	if ((r = sshkey_load_public(certpath, &cert, NULL)) != 0) {
338 		if (r != SSH_ERR_SYSTEM_ERROR || errno != ENOENT)
339 			error("Failed to load certificate \"%s\": %s",
340 			    certpath, ssh_err(r));
341 		goto out;
342 	}
343 
344 	if (!sshkey_equal_public(cert, private)) {
345 		error("Certificate %s does not match private key %s",
346 		    certpath, filename);
347 		sshkey_free(cert);
348 		goto out;
349 	}
350 
351 	/* Graft with private bits */
352 	if ((r = sshkey_to_certified(private)) != 0) {
353 		error("%s: sshkey_to_certified: %s", __func__, ssh_err(r));
354 		sshkey_free(cert);
355 		goto out;
356 	}
357 	if ((r = sshkey_cert_copy(cert, private)) != 0) {
358 		error("%s: sshkey_cert_copy: %s", __func__, ssh_err(r));
359 		sshkey_free(cert);
360 		goto out;
361 	}
362 	sshkey_free(cert);
363 
364 	if ((r = ssh_add_identity_constrained(agent_fd, private, comment,
365 	    lifetime, confirm, maxsign)) != 0) {
366 		error("Certificate %s (%s) add failed: %s", certpath,
367 		    private->cert->key_id, ssh_err(r));
368 		goto out;
369 	}
370 	/* success */
371 	if (!qflag) {
372 		fprintf(stderr, "Certificate added: %s (%s)\n", certpath,
373 		    private->cert->key_id);
374 		if (lifetime != 0) {
375 			fprintf(stderr, "Lifetime set to %d seconds\n",
376 			    lifetime);
377 		}
378 		if (confirm != 0) {
379 			fprintf(stderr, "The user must confirm each use "
380 			    "of the key\n");
381 		}
382 	}
383 
384  out:
385 	free(certpath);
386 	free(comment);
387 	sshkey_free(private);
388 
389 	return ret;
390 }
391 
392 static int
393 update_card(int agent_fd, int add, const char *id, int qflag)
394 {
395 	char *pin = NULL;
396 	int r, ret = -1;
397 
398 	if (add) {
399 		if ((pin = read_passphrase("Enter passphrase for PKCS#11: ",
400 		    RP_ALLOW_STDIN)) == NULL)
401 			return -1;
402 	}
403 
404 	if ((r = ssh_update_card(agent_fd, add, id, pin == NULL ? "" : pin,
405 	    lifetime, confirm)) == 0) {
406 		ret = 0;
407 		if (!qflag) {
408 			fprintf(stderr, "Card %s: %s\n",
409 			    add ? "added" : "removed", id);
410 		}
411 	} else {
412 		fprintf(stderr, "Could not %s card \"%s\": %s\n",
413 		    add ? "add" : "remove", id, ssh_err(r));
414 		ret = -1;
415 	}
416 	free(pin);
417 	return ret;
418 }
419 
420 static int
421 list_identities(int agent_fd, int do_fp)
422 {
423 	char *fp;
424 	int r;
425 	struct ssh_identitylist *idlist;
426 	u_int32_t left;
427 	size_t i;
428 
429 	if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
430 		if (r != SSH_ERR_AGENT_NO_IDENTITIES)
431 			fprintf(stderr, "error fetching identities: %s\n",
432 			    ssh_err(r));
433 		else
434 			printf("The agent has no identities.\n");
435 		return -1;
436 	}
437 	for (i = 0; i < idlist->nkeys; i++) {
438 		if (do_fp) {
439 			fp = sshkey_fingerprint(idlist->keys[i],
440 			    fingerprint_hash, SSH_FP_DEFAULT);
441 			printf("%u %s %s (%s)\n", sshkey_size(idlist->keys[i]),
442 			    fp == NULL ? "(null)" : fp, idlist->comments[i],
443 			    sshkey_type(idlist->keys[i]));
444 			free(fp);
445 		} else {
446 			if ((r = sshkey_write(idlist->keys[i], stdout)) != 0) {
447 				fprintf(stderr, "sshkey_write: %s\n",
448 				    ssh_err(r));
449 				continue;
450 			}
451 			fprintf(stdout, " %s", idlist->comments[i]);
452 			left = sshkey_signatures_left(idlist->keys[i]);
453 			if (left > 0)
454 				fprintf(stdout,
455 				    " [signatures left %d]", left);
456 			fprintf(stdout, "\n");
457 		}
458 	}
459 	ssh_free_identitylist(idlist);
460 	return 0;
461 }
462 
463 static int
464 lock_agent(int agent_fd, int lock)
465 {
466 	char prompt[100], *p1, *p2;
467 	int r, passok = 1, ret = -1;
468 
469 	strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
470 	p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
471 	if (lock) {
472 		strlcpy(prompt, "Again: ", sizeof prompt);
473 		p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
474 		if (strcmp(p1, p2) != 0) {
475 			fprintf(stderr, "Passwords do not match.\n");
476 			passok = 0;
477 		}
478 		explicit_bzero(p2, strlen(p2));
479 		free(p2);
480 	}
481 	if (passok) {
482 		if ((r = ssh_lock_agent(agent_fd, lock, p1)) == 0) {
483 			fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
484 			ret = 0;
485 		} else {
486 			fprintf(stderr, "Failed to %slock agent: %s\n",
487 			    lock ? "" : "un", ssh_err(r));
488 		}
489 	}
490 	explicit_bzero(p1, strlen(p1));
491 	free(p1);
492 	return (ret);
493 }
494 
495 static int
496 do_file(int agent_fd, int deleting, int key_only, char *file, int qflag)
497 {
498 	if (deleting) {
499 		if (delete_file(agent_fd, file, key_only, qflag) == -1)
500 			return -1;
501 	} else {
502 		if (add_file(agent_fd, file, key_only, qflag) == -1)
503 			return -1;
504 	}
505 	return 0;
506 }
507 
508 static void
509 usage(void)
510 {
511 	fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
512 	fprintf(stderr, "Options:\n");
513 	fprintf(stderr, "  -l          List fingerprints of all identities.\n");
514 	fprintf(stderr, "  -E hash     Specify hash algorithm used for fingerprints.\n");
515 	fprintf(stderr, "  -L          List public key parameters of all identities.\n");
516 	fprintf(stderr, "  -k          Load only keys and not certificates.\n");
517 	fprintf(stderr, "  -c          Require confirmation to sign using identities\n");
518 	fprintf(stderr, "  -m minleft  Maxsign is only changed if less than minleft are left (for XMSS)\n");
519 	fprintf(stderr, "  -M maxsign  Maximum number of signatures allowed (for XMSS)\n");
520 	fprintf(stderr, "  -t life     Set lifetime (in seconds) when adding identities.\n");
521 	fprintf(stderr, "  -d          Delete identity.\n");
522 	fprintf(stderr, "  -D          Delete all identities.\n");
523 	fprintf(stderr, "  -x          Lock agent.\n");
524 	fprintf(stderr, "  -X          Unlock agent.\n");
525 	fprintf(stderr, "  -s pkcs11   Add keys from PKCS#11 provider.\n");
526 	fprintf(stderr, "  -e pkcs11   Remove keys provided by PKCS#11 provider.\n");
527 	fprintf(stderr, "  -q          Be quiet after a successful operation.\n");
528 }
529 
530 int
531 main(int argc, char **argv)
532 {
533 	extern char *optarg;
534 	extern int optind;
535 	int agent_fd;
536 	char *pkcs11provider = NULL;
537 	int r, i, ch, deleting = 0, ret = 0, key_only = 0;
538 	int xflag = 0, lflag = 0, Dflag = 0, qflag = 0;
539 
540 	ssh_malloc_init();	/* must be called before any mallocs */
541 	/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
542 	sanitise_stdfd();
543 
544 	__progname = ssh_get_progname(argv[0]);
545 	seed_rng();
546 
547 	setvbuf(stdout, NULL, _IOLBF, 0);
548 
549 	/* First, get a connection to the authentication agent. */
550 	switch (r = ssh_get_authentication_socket(&agent_fd)) {
551 	case 0:
552 		break;
553 	case SSH_ERR_AGENT_NOT_PRESENT:
554 		fprintf(stderr, "Could not open a connection to your "
555 		    "authentication agent.\n");
556 		exit(2);
557 	default:
558 		fprintf(stderr, "Error connecting to agent: %s\n", ssh_err(r));
559 		exit(2);
560 	}
561 
562 	while ((ch = getopt(argc, argv, "klLcdDxXE:e:M:m:qs:t:")) != -1) {
563 		switch (ch) {
564 		case 'E':
565 			fingerprint_hash = ssh_digest_alg_by_name(optarg);
566 			if (fingerprint_hash == -1)
567 				fatal("Invalid hash algorithm \"%s\"", optarg);
568 			break;
569 		case 'k':
570 			key_only = 1;
571 			break;
572 		case 'l':
573 		case 'L':
574 			if (lflag != 0)
575 				fatal("-%c flag already specified", lflag);
576 			lflag = ch;
577 			break;
578 		case 'x':
579 		case 'X':
580 			if (xflag != 0)
581 				fatal("-%c flag already specified", xflag);
582 			xflag = ch;
583 			break;
584 		case 'c':
585 			confirm = 1;
586 			break;
587 		case 'm':
588 			minleft = (int)strtonum(optarg, 1, UINT_MAX, NULL);
589 			if (minleft == 0) {
590 				usage();
591 				ret = 1;
592 				goto done;
593 			}
594 			break;
595 		case 'M':
596 			maxsign = (int)strtonum(optarg, 1, UINT_MAX, NULL);
597 			if (maxsign == 0) {
598 				usage();
599 				ret = 1;
600 				goto done;
601 			}
602 			break;
603 		case 'd':
604 			deleting = 1;
605 			break;
606 		case 'D':
607 			Dflag = 1;
608 			break;
609 		case 's':
610 			pkcs11provider = optarg;
611 			break;
612 		case 'e':
613 			deleting = 1;
614 			pkcs11provider = optarg;
615 			break;
616 		case 't':
617 			if ((lifetime = convtime(optarg)) == -1) {
618 				fprintf(stderr, "Invalid lifetime\n");
619 				ret = 1;
620 				goto done;
621 			}
622 			break;
623 		case 'q':
624 			qflag = 1;
625 			break;
626 		default:
627 			usage();
628 			ret = 1;
629 			goto done;
630 		}
631 	}
632 
633 	if ((xflag != 0) + (lflag != 0) + (Dflag != 0) > 1)
634 		fatal("Invalid combination of actions");
635 	else if (xflag) {
636 		if (lock_agent(agent_fd, xflag == 'x' ? 1 : 0) == -1)
637 			ret = 1;
638 		goto done;
639 	} else if (lflag) {
640 		if (list_identities(agent_fd, lflag == 'l' ? 1 : 0) == -1)
641 			ret = 1;
642 		goto done;
643 	} else if (Dflag) {
644 		if (delete_all(agent_fd, qflag) == -1)
645 			ret = 1;
646 		goto done;
647 	}
648 
649 	argc -= optind;
650 	argv += optind;
651 	if (pkcs11provider != NULL) {
652 		if (update_card(agent_fd, !deleting, pkcs11provider,
653 		    qflag) == -1)
654 			ret = 1;
655 		goto done;
656 	}
657 	if (argc == 0) {
658 		char buf[PATH_MAX];
659 		struct passwd *pw;
660 		struct stat st;
661 		int count = 0;
662 
663 		if ((pw = getpwuid(getuid())) == NULL) {
664 			fprintf(stderr, "No user found with uid %u\n",
665 			    (u_int)getuid());
666 			ret = 1;
667 			goto done;
668 		}
669 
670 		for (i = 0; default_files[i]; i++) {
671 			snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
672 			    default_files[i]);
673 			if (stat(buf, &st) < 0)
674 				continue;
675 			if (do_file(agent_fd, deleting, key_only, buf,
676 			    qflag) == -1)
677 				ret = 1;
678 			else
679 				count++;
680 		}
681 		if (count == 0)
682 			ret = 1;
683 	} else {
684 		for (i = 0; i < argc; i++) {
685 			if (do_file(agent_fd, deleting, key_only,
686 			    argv[i], qflag) == -1)
687 				ret = 1;
688 		}
689 	}
690 	clear_pass();
691 
692 done:
693 	ssh_close_authentication_socket(agent_fd);
694 	return ret;
695 }
696