Annotation of src/crypto/external/bsd/openssh/dist/ssh-add.c, Revision 1.6
1.6 ! christos 1: /* $NetBSD: ssh-add.c,v 1.5 2011/09/07 17:49:19 christos Exp $ */
1.1 christos 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:
1.2 christos 38: #include "includes.h"
1.6 ! christos 39: __RCSID("$NetBSD: ssh-add.c,v 1.5 2011/09/07 17:49:19 christos Exp $");
1.1 christos 40: #include <sys/types.h>
41: #include <sys/stat.h>
42: #include <sys/param.h>
43:
44: #include <openssl/evp.h>
45:
46: #include <fcntl.h>
47: #include <pwd.h>
48: #include <stdio.h>
49: #include <stdlib.h>
50: #include <string.h>
51: #include <unistd.h>
52:
53: #include "xmalloc.h"
54: #include "ssh.h"
55: #include "rsa.h"
56: #include "log.h"
57: #include "key.h"
58: #include "buffer.h"
59: #include "authfd.h"
60: #include "authfile.h"
61: #include "pathnames.h"
62: #include "misc.h"
63:
64: /* argv0 */
65: extern char *__progname;
66:
67: /* Default files to add */
1.4 christos 68: static const char *default_files[] = {
1.1 christos 69: _PATH_SSH_CLIENT_ID_RSA,
70: _PATH_SSH_CLIENT_ID_DSA,
1.4 christos 71: _PATH_SSH_CLIENT_ID_ECDSA,
1.1 christos 72: _PATH_SSH_CLIENT_IDENTITY,
73: NULL
74: };
75:
76: /* Default lifetime (0 == forever) */
77: static int lifetime = 0;
78:
79: /* User has to confirm key use */
80: static int confirm = 0;
81:
82: /* we keep a cache of one passphrases */
83: static char *pass = NULL;
84: static void
85: clear_pass(void)
86: {
87: if (pass) {
88: memset(pass, 0, strlen(pass));
89: xfree(pass);
90: pass = NULL;
91: }
92: }
93:
94: static int
95: delete_file(AuthenticationConnection *ac, const char *filename)
96: {
97: Key *public;
98: char *comment = NULL;
99: int ret = -1;
100:
101: public = key_load_public(filename, &comment);
102: if (public == NULL) {
103: printf("Bad key file %s\n", filename);
104: return -1;
105: }
106: if (ssh_remove_identity(ac, public)) {
107: fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment);
108: ret = 0;
109: } else
110: fprintf(stderr, "Could not remove identity: %s\n", filename);
111:
112: key_free(public);
113: xfree(comment);
114:
115: return ret;
116: }
117:
118: /* Send a request to remove all identities. */
119: static int
120: delete_all(AuthenticationConnection *ac)
121: {
122: int ret = -1;
123:
124: if (ssh_remove_all_identities(ac, 1))
125: ret = 0;
126: /* ignore error-code for ssh2 */
127: ssh_remove_all_identities(ac, 2);
128:
129: if (ret == 0)
130: fprintf(stderr, "All identities removed.\n");
131: else
132: fprintf(stderr, "Failed to remove all identities.\n");
133:
134: return ret;
135: }
136:
137: static int
1.6 ! christos 138: add_file(AuthenticationConnection *ac, const char *filename, int key_only)
1.1 christos 139: {
1.3 adam 140: Key *private, *cert;
1.1 christos 141: char *comment = NULL;
1.6 ! christos 142: char msg[1024], *certpath = NULL;
1.1 christos 143: int fd, perms_ok, ret = -1;
1.5 christos 144: Buffer keyblob;
1.1 christos 145:
1.5 christos 146: if (strcmp(filename, "-") == 0) {
147: fd = STDIN_FILENO;
148: filename = "(stdin)";
149: } else if ((fd = open(filename, O_RDONLY)) < 0) {
1.1 christos 150: perror(filename);
151: return -1;
152: }
153:
154: /*
155: * Since we'll try to load a keyfile multiple times, permission errors
156: * will occur multiple times, so check perms first and bail if wrong.
157: */
1.5 christos 158: if (fd != STDIN_FILENO) {
159: perms_ok = key_perm_ok(fd, filename);
160: if (!perms_ok) {
161: close(fd);
162: return -1;
163: }
164: }
165: buffer_init(&keyblob);
166: if (!key_load_file(fd, filename, &keyblob)) {
167: buffer_free(&keyblob);
168: close(fd);
169: return -1;
170: }
1.1 christos 171: close(fd);
172:
173: /* At first, try empty passphrase */
1.5 christos 174: private = key_parse_private(&keyblob, filename, "", &comment);
1.1 christos 175: if (comment == NULL)
176: comment = xstrdup(filename);
177: /* try last */
178: if (private == NULL && pass != NULL)
1.5 christos 179: private = key_parse_private(&keyblob, filename, pass, NULL);
1.1 christos 180: if (private == NULL) {
181: /* clear passphrase since it did not work */
182: clear_pass();
183: snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ",
184: comment);
185: for (;;) {
186: pass = read_passphrase(msg, RP_ALLOW_STDIN);
187: if (strcmp(pass, "") == 0) {
188: clear_pass();
189: xfree(comment);
1.5 christos 190: buffer_free(&keyblob);
1.1 christos 191: return -1;
192: }
1.5 christos 193: private = key_parse_private(&keyblob, filename, pass,
194: &comment);
1.1 christos 195: if (private != NULL)
196: break;
197: clear_pass();
198: snprintf(msg, sizeof msg,
199: "Bad passphrase, try again for %.200s: ", comment);
200: }
201: }
1.5 christos 202: buffer_free(&keyblob);
1.1 christos 203:
204: if (ssh_add_identity_constrained(ac, private, comment, lifetime,
205: confirm)) {
206: fprintf(stderr, "Identity added: %s (%s)\n", filename, comment);
207: ret = 0;
208: if (lifetime != 0)
209: fprintf(stderr,
210: "Lifetime set to %d seconds\n", lifetime);
211: if (confirm != 0)
212: fprintf(stderr,
1.3 adam 213: "The user must confirm each use of the key\n");
1.1 christos 214: } else {
215: fprintf(stderr, "Could not add identity: %s\n", filename);
216: }
217:
1.6 ! christos 218: /* Skip trying to load the cert if requested */
! 219: if (key_only)
! 220: goto out;
1.3 adam 221:
222: /* Now try to add the certificate flavour too */
223: xasprintf(&certpath, "%s-cert.pub", filename);
224: if ((cert = key_load_public(certpath, NULL)) == NULL)
225: goto out;
226:
227: if (!key_equal_public(cert, private)) {
228: error("Certificate %s does not match private key %s",
229: certpath, filename);
230: key_free(cert);
231: goto out;
232: }
233:
234: /* Graft with private bits */
235: if (key_to_certified(private, key_cert_is_legacy(cert)) != 0) {
236: error("%s: key_to_certified failed", __func__);
237: key_free(cert);
238: goto out;
239: }
240: key_cert_copy(cert, private);
241: key_free(cert);
242:
243: if (!ssh_add_identity_constrained(ac, private, comment,
244: lifetime, confirm)) {
245: error("Certificate %s (%s) add failed", certpath,
246: private->cert->key_id);
247: }
248: fprintf(stderr, "Certificate added: %s (%s)\n", certpath,
249: private->cert->key_id);
250: if (lifetime != 0)
251: fprintf(stderr, "Lifetime set to %d seconds\n", lifetime);
252: if (confirm != 0)
253: fprintf(stderr, "The user must confirm each use of the key\n");
254: out:
1.6 ! christos 255: if (certpath != NULL)
! 256: xfree(certpath);
1.1 christos 257: xfree(comment);
258: key_free(private);
259:
260: return ret;
261: }
262:
263: static int
264: update_card(AuthenticationConnection *ac, int add, const char *id)
265: {
266: char *pin;
267: int ret = -1;
268:
1.3 adam 269: pin = read_passphrase("Enter passphrase for PKCS#11: ", RP_ALLOW_STDIN);
1.1 christos 270: if (pin == NULL)
271: return -1;
272:
273: if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) {
274: fprintf(stderr, "Card %s: %s\n",
275: add ? "added" : "removed", id);
276: ret = 0;
277: } else {
278: fprintf(stderr, "Could not %s card: %s\n",
279: add ? "add" : "remove", id);
280: ret = -1;
281: }
282: xfree(pin);
283: return ret;
284: }
285:
286: static int
287: list_identities(AuthenticationConnection *ac, int do_fp)
288: {
289: Key *key;
290: char *comment, *fp;
291: int had_identities = 0;
292: int version;
293:
294: for (version = 1; version <= 2; version++) {
295: for (key = ssh_get_first_identity(ac, &comment, version);
296: key != NULL;
297: key = ssh_get_next_identity(ac, &comment, version)) {
298: had_identities = 1;
299: if (do_fp) {
300: fp = key_fingerprint(key, SSH_FP_MD5,
301: SSH_FP_HEX);
302: printf("%d %s %s (%s)\n",
303: key_size(key), fp, comment, key_type(key));
304: xfree(fp);
305: } else {
306: if (!key_write(key, stdout))
307: fprintf(stderr, "key_write failed");
308: fprintf(stdout, " %s\n", comment);
309: }
310: key_free(key);
311: xfree(comment);
312: }
313: }
314: if (!had_identities) {
315: printf("The agent has no identities.\n");
316: return -1;
317: }
318: return 0;
319: }
320:
321: static int
322: lock_agent(AuthenticationConnection *ac, int lock)
323: {
324: char prompt[100], *p1, *p2;
325: int passok = 1, ret = -1;
326:
327: strlcpy(prompt, "Enter lock password: ", sizeof(prompt));
328: p1 = read_passphrase(prompt, RP_ALLOW_STDIN);
329: if (lock) {
330: strlcpy(prompt, "Again: ", sizeof prompt);
331: p2 = read_passphrase(prompt, RP_ALLOW_STDIN);
332: if (strcmp(p1, p2) != 0) {
333: fprintf(stderr, "Passwords do not match.\n");
334: passok = 0;
335: }
336: memset(p2, 0, strlen(p2));
337: xfree(p2);
338: }
339: if (passok && ssh_lock_agent(ac, lock, p1)) {
340: fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un");
341: ret = 0;
342: } else
343: fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un");
344: memset(p1, 0, strlen(p1));
345: xfree(p1);
346: return (ret);
347: }
348:
349: static int
1.6 ! christos 350: do_file(AuthenticationConnection *ac, int deleting, int key_only, char *file)
1.1 christos 351: {
352: if (deleting) {
353: if (delete_file(ac, file) == -1)
354: return -1;
355: } else {
1.6 ! christos 356: if (add_file(ac, file, key_only) == -1)
1.1 christos 357: return -1;
358: }
359: return 0;
360: }
361:
362: static void
363: usage(void)
364: {
365: fprintf(stderr, "usage: %s [options] [file ...]\n", __progname);
366: fprintf(stderr, "Options:\n");
367: fprintf(stderr, " -l List fingerprints of all identities.\n");
368: fprintf(stderr, " -L List public key parameters of all identities.\n");
1.6 ! christos 369: fprintf(stderr, " -k Load only keys and not certificates.\n");
! 370: fprintf(stderr, " -c Require confirmation to sign using identities\n");
! 371: fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n");
1.1 christos 372: fprintf(stderr, " -d Delete identity.\n");
373: fprintf(stderr, " -D Delete all identities.\n");
374: fprintf(stderr, " -x Lock agent.\n");
375: fprintf(stderr, " -X Unlock agent.\n");
1.3 adam 376: fprintf(stderr, " -s pkcs11 Add keys from PKCS#11 provider.\n");
377: fprintf(stderr, " -e pkcs11 Remove keys provided by PKCS#11 provider.\n");
1.1 christos 378: }
379:
380: int
381: main(int argc, char **argv)
382: {
383: extern char *optarg;
384: extern int optind;
385: AuthenticationConnection *ac = NULL;
1.3 adam 386: char *pkcs11provider = NULL;
1.6 ! christos 387: int i, ch, deleting = 0, ret = 0, key_only = 0;
1.1 christos 388:
389: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
390: sanitise_stdfd();
391:
1.4 christos 392: OpenSSL_add_all_algorithms();
1.1 christos 393:
394: /* At first, get a connection to the authentication agent. */
395: ac = ssh_get_authentication_connection();
396: if (ac == NULL) {
397: fprintf(stderr,
398: "Could not open a connection to your authentication agent.\n");
399: exit(2);
400: }
1.6 ! christos 401: while ((ch = getopt(argc, argv, "klLcdDxXe:s:t:")) != -1) {
1.1 christos 402: switch (ch) {
1.6 ! christos 403: case 'k':
! 404: key_only = 1;
! 405: break;
1.1 christos 406: case 'l':
407: case 'L':
408: if (list_identities(ac, ch == 'l' ? 1 : 0) == -1)
409: ret = 1;
410: goto done;
411: case 'x':
412: case 'X':
413: if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1)
414: ret = 1;
415: goto done;
416: case 'c':
417: confirm = 1;
418: break;
419: case 'd':
420: deleting = 1;
421: break;
422: case 'D':
423: if (delete_all(ac) == -1)
424: ret = 1;
425: goto done;
426: case 's':
1.3 adam 427: pkcs11provider = optarg;
1.1 christos 428: break;
429: case 'e':
430: deleting = 1;
1.3 adam 431: pkcs11provider = optarg;
1.1 christos 432: break;
433: case 't':
434: if ((lifetime = convtime(optarg)) == -1) {
435: fprintf(stderr, "Invalid lifetime\n");
436: ret = 1;
437: goto done;
438: }
439: break;
440: default:
441: usage();
442: ret = 1;
443: goto done;
444: }
445: }
446: argc -= optind;
447: argv += optind;
1.3 adam 448: if (pkcs11provider != NULL) {
449: if (update_card(ac, !deleting, pkcs11provider) == -1)
1.1 christos 450: ret = 1;
451: goto done;
452: }
453: if (argc == 0) {
454: char buf[MAXPATHLEN];
455: struct passwd *pw;
456: struct stat st;
457: int count = 0;
458:
459: if ((pw = getpwuid(getuid())) == NULL) {
460: fprintf(stderr, "No user found with uid %u\n",
461: (u_int)getuid());
462: ret = 1;
463: goto done;
464: }
465:
466: for (i = 0; default_files[i]; i++) {
467: snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir,
468: default_files[i]);
469: if (stat(buf, &st) < 0)
470: continue;
1.6 ! christos 471: if (do_file(ac, deleting, key_only, buf) == -1)
1.1 christos 472: ret = 1;
473: else
474: count++;
475: }
476: if (count == 0)
477: ret = 1;
478: } else {
479: for (i = 0; i < argc; i++) {
1.6 ! christos 480: if (do_file(ac, deleting, key_only, argv[i]) == -1)
1.1 christos 481: ret = 1;
482: }
483: }
484: clear_pass();
485:
486: done:
487: ssh_close_authentication_connection(ac);
488: return ret;
489: }
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