Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.195
1.195 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.194 2015/01/14 13:09:09 markus Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 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: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 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: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.141 stevesk 41: #include <sys/socket.h>
1.189 djm 42: #include <sys/stat.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.185 markus 46: #ifdef WITH_OPENSSL
1.146 stevesk 47: #include <openssl/evp.h>
1.185 markus 48: #endif
1.146 stevesk 49:
1.143 stevesk 50: #include <errno.h>
1.142 stevesk 51: #include <fcntl.h>
1.126 stevesk 52: #include <paths.h>
1.129 stevesk 53: #include <signal.h>
1.149 stevesk 54: #include <stdlib.h>
1.150 stevesk 55: #include <stdio.h>
1.146 stevesk 56: #include <string.h>
1.145 stevesk 57: #include <time.h>
1.144 stevesk 58: #include <unistd.h>
1.1 deraadt 59:
1.194 markus 60: #include "key.h" /* XXX for typedef */
61: #include "buffer.h" /* XXX for typedef */
62:
1.151 deraadt 63: #include "xmalloc.h"
1.1 deraadt 64: #include "ssh.h"
65: #include "rsa.h"
1.194 markus 66: #include "sshbuf.h"
67: #include "sshkey.h"
1.32 markus 68: #include "authfd.h"
1.37 markus 69: #include "compat.h"
1.47 markus 70: #include "log.h"
1.107 markus 71: #include "misc.h"
1.182 markus 72: #include "digest.h"
1.194 markus 73: #include "ssherr.h"
1.7 deraadt 74:
1.163 markus 75: #ifdef ENABLE_PKCS11
76: #include "ssh-pkcs11.h"
1.71 jakob 77: #endif
1.59 markus 78:
1.73 stevesk 79: typedef enum {
80: AUTH_UNUSED,
81: AUTH_SOCKET,
82: AUTH_CONNECTION
83: } sock_type;
84:
1.21 markus 85: typedef struct {
86: int fd;
1.73 stevesk 87: sock_type type;
1.194 markus 88: struct sshbuf *input;
89: struct sshbuf *output;
90: struct sshbuf *request;
1.1 deraadt 91: } SocketEntry;
92:
1.45 markus 93: u_int sockets_alloc = 0;
1.1 deraadt 94: SocketEntry *sockets = NULL;
95:
1.78 provos 96: typedef struct identity {
97: TAILQ_ENTRY(identity) next;
1.194 markus 98: struct sshkey *key;
1.21 markus 99: char *comment;
1.163 markus 100: char *provider;
1.174 dtucker 101: time_t death;
1.107 markus 102: u_int confirm;
1.1 deraadt 103: } Identity;
104:
1.33 markus 105: typedef struct {
106: int nentries;
1.78 provos 107: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 108: } Idtab;
109:
110: /* private key table, one per protocol version */
111: Idtab idtable[3];
1.1 deraadt 112:
113: int max_fd = 0;
114:
1.11 markus 115: /* pid of shell == parent of agent */
1.29 deraadt 116: pid_t parent_pid = -1;
1.176 dtucker 117: time_t parent_alive_interval = 0;
1.10 markus 118:
1.187 djm 119: /* pid of process for which cleanup_socket is applicable */
120: pid_t cleanup_pid = 0;
121:
1.10 markus 122: /* pathname and directory for AUTH_SOCKET */
1.132 djm 123: char socket_name[MAXPATHLEN];
124: char socket_dir[MAXPATHLEN];
1.10 markus 125:
1.88 markus 126: /* locking */
127: int locked = 0;
128: char *lock_passwd = NULL;
129:
1.20 markus 130: extern char *__progname;
131:
1.174 dtucker 132: /* Default lifetime in seconds (0 == forever) */
133: static long lifetime = 0;
1.106 marc 134:
1.192 djm 135: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
136:
1.55 itojun 137: static void
1.101 stevesk 138: close_socket(SocketEntry *e)
139: {
140: close(e->fd);
141: e->fd = -1;
142: e->type = AUTH_UNUSED;
1.194 markus 143: sshbuf_free(e->input);
144: sshbuf_free(e->output);
145: sshbuf_free(e->request);
1.101 stevesk 146: }
147:
148: static void
1.33 markus 149: idtab_init(void)
1.1 deraadt 150: {
1.33 markus 151: int i;
1.96 deraadt 152:
1.74 deraadt 153: for (i = 0; i <=2; i++) {
1.78 provos 154: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 155: idtable[i].nentries = 0;
156: }
157: }
158:
159: /* return private key table for requested protocol version */
1.55 itojun 160: static Idtab *
1.33 markus 161: idtab_lookup(int version)
162: {
163: if (version < 1 || version > 2)
164: fatal("internal error, bad protocol version %d", version);
165: return &idtable[version];
166: }
167:
1.89 markus 168: static void
169: free_identity(Identity *id)
170: {
1.194 markus 171: sshkey_free(id->key);
1.173 djm 172: free(id->provider);
173: free(id->comment);
174: free(id);
1.89 markus 175: }
176:
1.33 markus 177: /* return matching private key for given public key */
1.78 provos 178: static Identity *
1.194 markus 179: lookup_identity(struct sshkey *key, int version)
1.33 markus 180: {
1.78 provos 181: Identity *id;
182:
1.33 markus 183: Idtab *tab = idtab_lookup(version);
1.78 provos 184: TAILQ_FOREACH(id, &tab->idlist, next) {
1.194 markus 185: if (sshkey_equal(key, id->key))
1.78 provos 186: return (id);
1.33 markus 187: }
1.78 provos 188: return (NULL);
189: }
190:
1.107 markus 191: /* Check confirmation of keysign request */
192: static int
193: confirm_key(Identity *id)
194: {
1.122 djm 195: char *p;
1.107 markus 196: int ret = -1;
197:
1.194 markus 198: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.122 djm 199: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
200: id->comment, p))
201: ret = 0;
1.173 djm 202: free(p);
1.122 djm 203:
1.107 markus 204: return (ret);
205: }
206:
1.194 markus 207: static void
208: send_status(SocketEntry *e, int success)
209: {
210: int r;
211:
212: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
213: (r = sshbuf_put_u8(e->output, success ?
214: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
215: fatal("%s: buffer error: %s", __func__, ssh_err(r));
216: }
217:
1.33 markus 218: /* send list of supported public keys to 'client' */
1.55 itojun 219: static void
1.33 markus 220: process_request_identities(SocketEntry *e, int version)
221: {
222: Idtab *tab = idtab_lookup(version);
1.96 deraadt 223: Identity *id;
1.194 markus 224: struct sshbuf *msg;
225: int r;
1.1 deraadt 226:
1.194 markus 227: if ((msg = sshbuf_new()) == NULL)
228: fatal("%s: sshbuf_new failed", __func__);
229: if ((r = sshbuf_put_u8(msg, (version == 1) ?
230: SSH_AGENT_RSA_IDENTITIES_ANSWER :
231: SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
232: (r = sshbuf_put_u32(msg, tab->nentries)) != 0)
233: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.78 provos 234: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 235: if (id->key->type == KEY_RSA1) {
1.185 markus 236: #ifdef WITH_SSH1
1.194 markus 237: if ((r = sshbuf_put_u32(msg,
238: BN_num_bits(id->key->rsa->n))) != 0 ||
239: (r = sshbuf_put_bignum1(msg,
240: id->key->rsa->e)) != 0 ||
241: (r = sshbuf_put_bignum1(msg,
242: id->key->rsa->n)) != 0)
243: fatal("%s: buffer error: %s",
244: __func__, ssh_err(r));
1.185 markus 245: #endif
1.33 markus 246: } else {
1.45 markus 247: u_char *blob;
1.194 markus 248: size_t blen;
249:
250: if ((r = sshkey_to_blob(id->key, &blob, &blen)) != 0) {
251: error("%s: sshkey_to_blob: %s", __func__,
252: ssh_err(r));
253: continue;
254: }
255: if ((r = sshbuf_put_string(msg, blob, blen)) != 0)
256: fatal("%s: buffer error: %s",
257: __func__, ssh_err(r));
1.173 djm 258: free(blob);
1.33 markus 259: }
1.194 markus 260: if ((r = sshbuf_put_cstring(msg, id->comment)) != 0)
261: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 262: }
1.194 markus 263: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
264: fatal("%s: buffer error: %s", __func__, ssh_err(r));
265: sshbuf_free(msg);
1.1 deraadt 266: }
267:
1.185 markus 268: #ifdef WITH_SSH1
1.33 markus 269: /* ssh1 only */
1.55 itojun 270: static void
1.33 markus 271: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 272: {
1.96 deraadt 273: u_char buf[32], mdbuf[16], session_id[16];
274: u_int response_type;
275: BIGNUM *challenge;
1.78 provos 276: Identity *id;
1.194 markus 277: int r, len;
278: struct sshbuf *msg;
1.182 markus 279: struct ssh_digest_ctx *md;
1.194 markus 280: struct sshkey *key;
1.21 markus 281:
1.194 markus 282: if ((msg = sshbuf_new()) == NULL)
283: fatal("%s: sshbuf_new failed", __func__);
284: if ((key = sshkey_new(KEY_RSA1)) == NULL)
285: fatal("%s: sshkey_new failed", __func__);
1.76 markus 286: if ((challenge = BN_new()) == NULL)
1.194 markus 287: fatal("%s: BN_new failed", __func__);
1.33 markus 288:
1.194 markus 289: if ((r = sshbuf_get_u32(e->request, NULL)) != 0 || /* ignored */
290: (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
291: (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0 ||
292: (r = sshbuf_get_bignum1(e->request, challenge)))
293: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 294:
1.33 markus 295: /* Only protocol 1.1 is supported */
1.194 markus 296: if (sshbuf_len(e->request) == 0)
1.33 markus 297: goto failure;
1.194 markus 298: if ((r = sshbuf_get(e->request, session_id, sizeof(session_id))) != 0 ||
299: (r = sshbuf_get_u32(e->request, &response_type)) != 0)
300: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.33 markus 301: if (response_type != 1)
302: goto failure;
303:
1.78 provos 304: id = lookup_identity(key, 1);
1.107 markus 305: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.194 markus 306: struct sshkey *private = id->key;
1.33 markus 307: /* Decrypt the challenge using the private key. */
1.194 markus 308: if ((r = rsa_private_decrypt(challenge, challenge,
309: private->rsa) != 0)) {
310: fatal("%s: rsa_public_encrypt: %s", __func__,
311: ssh_err(r));
312: goto failure; /* XXX ? */
313: }
1.33 markus 314:
1.194 markus 315: /* The response is MD5 of decrypted challenge plus session id */
1.33 markus 316: len = BN_num_bytes(challenge);
317: if (len <= 0 || len > 32) {
1.194 markus 318: logit("%s: bad challenge length %d", __func__, len);
1.33 markus 319: goto failure;
320: }
321: memset(buf, 0, 32);
322: BN_bn2bin(challenge, buf + 32 - len);
1.182 markus 323: if ((md = ssh_digest_start(SSH_DIGEST_MD5)) == NULL ||
324: ssh_digest_update(md, buf, 32) < 0 ||
325: ssh_digest_update(md, session_id, 16) < 0 ||
326: ssh_digest_final(md, mdbuf, sizeof(mdbuf)) < 0)
327: fatal("%s: md5 failed", __func__);
328: ssh_digest_free(md);
1.33 markus 329:
330: /* Send the response. */
1.194 markus 331: if ((r = sshbuf_put_u8(msg, SSH_AGENT_RSA_RESPONSE)) != 0 ||
332: (r = sshbuf_put(msg, mdbuf, sizeof(mdbuf))) != 0)
333: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.33 markus 334: goto send;
335: }
1.21 markus 336:
1.194 markus 337: failure:
1.33 markus 338: /* Unknown identity or protocol error. Send failure. */
1.194 markus 339: if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
340: fatal("%s: buffer error: %s", __func__, ssh_err(r));
341: send:
342: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
343: fatal("%s: buffer error: %s", __func__, ssh_err(r));
344: sshkey_free(key);
1.33 markus 345: BN_clear_free(challenge);
1.194 markus 346: sshbuf_free(msg);
1.33 markus 347: }
1.185 markus 348: #endif
1.33 markus 349:
350: /* ssh2 only */
1.55 itojun 351: static void
1.33 markus 352: process_sign_request2(SocketEntry *e)
353: {
1.45 markus 354: u_char *blob, *data, *signature = NULL;
1.194 markus 355: size_t blen, dlen, slen = 0;
356: u_int compat = 0, flags;
357: int r, ok = -1;
358: struct sshbuf *msg;
359: struct sshkey *key;
1.195 ! djm 360: struct identity *id;
1.194 markus 361:
1.195 ! djm 362: if ((msg = sshbuf_new()) == NULL)
! 363: fatal("%s: sshbuf_new failed", __func__);
1.194 markus 364: if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0 ||
365: (r = sshbuf_get_string(e->request, &data, &dlen)) != 0 ||
366: (r = sshbuf_get_u32(e->request, &flags)) != 0)
367: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.37 markus 368: if (flags & SSH_AGENT_OLD_SIGNATURE)
1.194 markus 369: compat = SSH_BUG_SIGBLOB;
1.195 ! djm 370: if ((r = sshkey_from_blob(blob, blen, &key)) != 0) {
1.194 markus 371: error("%s: cannot parse key blob: %s", __func__, ssh_err(ok));
1.195 ! djm 372: goto send;
! 373: }
! 374: if ((id = lookup_identity(key, 2)) == NULL) {
! 375: verbose("%s: %s key not found", __func__, sshkey_type(key));
! 376: goto send;
! 377: }
! 378: if (id->confirm && confirm_key(id) != 0) {
! 379: verbose("%s: user refused key", __func__);
! 380: goto send;
! 381: }
! 382: if ((r = sshkey_sign(id->key, &signature, &slen,
! 383: data, dlen, compat)) != 0) {
! 384: error("%s: sshkey_sign: %s", __func__, ssh_err(ok));
! 385: goto send;
1.33 markus 386: }
1.195 ! djm 387: /* Success */
! 388: ok = 0;
! 389: send:
! 390: sshkey_free(key);
1.33 markus 391: if (ok == 0) {
1.194 markus 392: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
393: (r = sshbuf_put_string(msg, signature, slen)) != 0)
394: fatal("%s: buffer error: %s", __func__, ssh_err(r));
395: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
396: fatal("%s: buffer error: %s", __func__, ssh_err(r));
397:
398: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
399: fatal("%s: buffer error: %s", __func__, ssh_err(r));
400:
401: sshbuf_free(msg);
1.173 djm 402: free(data);
403: free(blob);
404: free(signature);
1.1 deraadt 405: }
406:
1.33 markus 407: /* shared */
1.55 itojun 408: static void
1.33 markus 409: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 410: {
1.194 markus 411: size_t blen;
412: int r, success = 0;
413: struct sshkey *key = NULL;
1.45 markus 414: u_char *blob;
1.186 djm 415: #ifdef WITH_SSH1
416: u_int bits;
417: #endif /* WITH_SSH1 */
1.21 markus 418:
1.74 deraadt 419: switch (version) {
1.186 djm 420: #ifdef WITH_SSH1
1.33 markus 421: case 1:
1.194 markus 422: if ((key = sshkey_new(KEY_RSA1)) == NULL) {
423: error("%s: sshkey_new failed", __func__);
424: return;
425: }
426: if ((r = sshbuf_get_u32(e->request, &bits)) != 0 ||
427: (r = sshbuf_get_bignum1(e->request, key->rsa->e)) != 0 ||
428: (r = sshbuf_get_bignum1(e->request, key->rsa->n)) != 0)
429: fatal("%s: buffer error: %s", __func__, ssh_err(r));
430:
431: if (bits != sshkey_size(key))
432: logit("Warning: identity keysize mismatch: "
433: "actual %u, announced %u",
434: sshkey_size(key), bits);
1.33 markus 435: break;
1.186 djm 436: #endif /* WITH_SSH1 */
1.33 markus 437: case 2:
1.194 markus 438: if ((r = sshbuf_get_string(e->request, &blob, &blen)) != 0)
439: fatal("%s: buffer error: %s", __func__, ssh_err(r));
440: if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
441: error("%s: sshkey_from_blob failed: %s",
442: __func__, ssh_err(r));
1.173 djm 443: free(blob);
1.33 markus 444: break;
445: }
446: if (key != NULL) {
1.78 provos 447: Identity *id = lookup_identity(key, version);
448: if (id != NULL) {
1.23 markus 449: /*
450: * We have this key. Free the old key. Since we
1.124 djm 451: * don't want to leave empty slots in the middle of
1.40 markus 452: * the array, we actually free the key there and move
453: * all the entries between the empty slot and the end
454: * of the array.
1.23 markus 455: */
1.33 markus 456: Idtab *tab = idtab_lookup(version);
1.38 markus 457: if (tab->nentries < 1)
458: fatal("process_remove_identity: "
459: "internal error: tab->nentries %d",
460: tab->nentries);
1.78 provos 461: TAILQ_REMOVE(&tab->idlist, id, next);
462: free_identity(id);
1.33 markus 463: tab->nentries--;
464: success = 1;
1.21 markus 465: }
1.194 markus 466: sshkey_free(key);
1.33 markus 467: }
1.194 markus 468: send_status(e, success);
1.1 deraadt 469: }
470:
1.55 itojun 471: static void
1.33 markus 472: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 473: {
1.33 markus 474: Idtab *tab = idtab_lookup(version);
1.78 provos 475: Identity *id;
1.21 markus 476:
477: /* Loop over all identities and clear the keys. */
1.78 provos 478: for (id = TAILQ_FIRST(&tab->idlist); id;
479: id = TAILQ_FIRST(&tab->idlist)) {
480: TAILQ_REMOVE(&tab->idlist, id, next);
481: free_identity(id);
1.21 markus 482: }
483:
484: /* Mark that there are no identities. */
1.33 markus 485: tab->nentries = 0;
1.21 markus 486:
487: /* Send success. */
1.194 markus 488: send_status(e, 1);
1.1 deraadt 489: }
490:
1.155 dtucker 491: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 492: static time_t
1.89 markus 493: reaper(void)
494: {
1.175 dtucker 495: time_t deadline = 0, now = monotime();
1.89 markus 496: Identity *id, *nxt;
497: int version;
1.96 deraadt 498: Idtab *tab;
1.89 markus 499:
500: for (version = 1; version < 3; version++) {
501: tab = idtab_lookup(version);
502: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
503: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 504: if (id->death == 0)
505: continue;
506: if (now >= id->death) {
1.154 dtucker 507: debug("expiring key '%s'", id->comment);
1.89 markus 508: TAILQ_REMOVE(&tab->idlist, id, next);
509: free_identity(id);
510: tab->nentries--;
1.155 dtucker 511: } else
512: deadline = (deadline == 0) ? id->death :
513: MIN(deadline, id->death);
1.89 markus 514: }
515: }
1.155 dtucker 516: if (deadline == 0 || deadline <= now)
517: return 0;
518: else
519: return (deadline - now);
1.89 markus 520: }
521:
1.194 markus 522: /*
523: * XXX this and the corresponding serialisation function probably belongs
524: * in key.c
525: */
526: static int
527: agent_decode_rsa1(struct sshbuf *m, struct sshkey **kp)
528: {
529: struct sshkey *k = NULL;
530: int r = SSH_ERR_INTERNAL_ERROR;
531:
532: *kp = NULL;
533: if ((k = sshkey_new_private(KEY_RSA1)) == NULL)
534: return SSH_ERR_ALLOC_FAIL;
535:
536: if ((r = sshbuf_get_u32(m, NULL)) != 0 || /* ignored */
537: (r = sshbuf_get_bignum1(m, k->rsa->n)) != 0 ||
538: (r = sshbuf_get_bignum1(m, k->rsa->e)) != 0 ||
539: (r = sshbuf_get_bignum1(m, k->rsa->d)) != 0 ||
540: (r = sshbuf_get_bignum1(m, k->rsa->iqmp)) != 0 ||
541: /* SSH1 and SSL have p and q swapped */
542: (r = sshbuf_get_bignum1(m, k->rsa->q)) != 0 || /* p */
543: (r = sshbuf_get_bignum1(m, k->rsa->p)) != 0) /* q */
544: goto out;
545:
546: /* Generate additional parameters */
547: if ((r = rsa_generate_additional_parameters(k->rsa)) != 0)
548: goto out;
549: /* enable blinding */
550: if (RSA_blinding_on(k->rsa, NULL) != 1) {
551: r = SSH_ERR_LIBCRYPTO_ERROR;
552: goto out;
553: }
554:
555: r = 0; /* success */
556: out:
557: if (r == 0)
558: *kp = k;
559: else
560: sshkey_free(k);
561: return r;
562: }
563:
1.89 markus 564: static void
1.33 markus 565: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 566: {
1.96 deraadt 567: Idtab *tab = idtab_lookup(version);
1.157 canacar 568: Identity *id;
1.194 markus 569: int success = 0, confirm = 0;
570: u_int seconds;
571: char *comment = NULL;
1.174 dtucker 572: time_t death = 0;
1.194 markus 573: struct sshkey *k = NULL;
574: u_char ctype;
575: int r = SSH_ERR_INTERNAL_ERROR;
1.33 markus 576:
577: switch (version) {
1.186 djm 578: #ifdef WITH_SSH1
1.33 markus 579: case 1:
1.194 markus 580: r = agent_decode_rsa1(e->request, &k);
1.33 markus 581: break;
1.186 djm 582: #endif /* WITH_SSH1 */
1.33 markus 583: case 2:
1.194 markus 584: r = sshkey_private_deserialize(e->request, &k);
1.33 markus 585: break;
586: }
1.194 markus 587: if (r != 0 || k == NULL ||
588: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
589: error("%s: decode private key: %s", __func__, ssh_err(r));
590: goto err;
591: }
1.186 djm 592:
1.194 markus 593: while (sshbuf_len(e->request)) {
594: if ((r = sshbuf_get_u8(e->request, &ctype)) != 0) {
595: error("%s: buffer error: %s", __func__, ssh_err(r));
596: goto err;
597: }
598: switch (ctype) {
1.94 markus 599: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 600: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0) {
601: error("%s: bad lifetime constraint: %s",
602: __func__, ssh_err(r));
603: goto err;
604: }
605: death = monotime() + seconds;
1.94 markus 606: break;
1.107 markus 607: case SSH_AGENT_CONSTRAIN_CONFIRM:
608: confirm = 1;
609: break;
1.94 markus 610: default:
1.194 markus 611: error("%s: Unknown constraint %d", __func__, ctype);
612: err:
613: sshbuf_reset(e->request);
1.173 djm 614: free(comment);
1.194 markus 615: sshkey_free(k);
1.158 djm 616: goto send;
1.94 markus 617: }
618: }
1.194 markus 619:
1.158 djm 620: success = 1;
1.106 marc 621: if (lifetime && !death)
1.175 dtucker 622: death = monotime() + lifetime;
1.157 canacar 623: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 624: id = xcalloc(1, sizeof(Identity));
1.78 provos 625: id->key = k;
626: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 627: /* Increment the number of identities. */
628: tab->nentries++;
629: } else {
1.194 markus 630: sshkey_free(k);
1.173 djm 631: free(id->comment);
1.33 markus 632: }
1.157 canacar 633: id->comment = comment;
634: id->death = death;
635: id->confirm = confirm;
1.33 markus 636: send:
1.194 markus 637: send_status(e, success);
1.1 deraadt 638: }
639:
1.88 markus 640: /* XXX todo: encrypt sensitive data with passphrase */
641: static void
642: process_lock_agent(SocketEntry *e, int lock)
643: {
1.194 markus 644: int r, success = 0;
1.88 markus 645: char *passwd;
646:
1.194 markus 647: if ((r = sshbuf_get_cstring(e->request, &passwd, NULL)) != 0)
648: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.88 markus 649: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
650: locked = 0;
1.183 djm 651: explicit_bzero(lock_passwd, strlen(lock_passwd));
1.173 djm 652: free(lock_passwd);
1.88 markus 653: lock_passwd = NULL;
654: success = 1;
655: } else if (!locked && lock) {
656: locked = 1;
657: lock_passwd = xstrdup(passwd);
658: success = 1;
659: }
1.183 djm 660: explicit_bzero(passwd, strlen(passwd));
1.173 djm 661: free(passwd);
1.194 markus 662: send_status(e, success);
1.88 markus 663: }
664:
665: static void
666: no_identities(SocketEntry *e, u_int type)
667: {
1.194 markus 668: struct sshbuf *msg;
669: int r;
1.88 markus 670:
1.194 markus 671: if ((msg = sshbuf_new()) == NULL)
672: fatal("%s: sshbuf_new failed", __func__);
673: if ((r = sshbuf_put_u8(msg,
1.88 markus 674: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
1.194 markus 675: SSH_AGENT_RSA_IDENTITIES_ANSWER :
676: SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
677: (r = sshbuf_put_u32(msg, 0)) != 0 ||
678: (r = sshbuf_put_stringb(e->output, msg)) != 0)
679: fatal("%s: buffer error: %s", __func__, ssh_err(r));
680: sshbuf_free(msg);
1.88 markus 681: }
1.59 markus 682:
1.163 markus 683: #ifdef ENABLE_PKCS11
1.59 markus 684: static void
1.158 djm 685: process_add_smartcard_key(SocketEntry *e)
1.59 markus 686: {
1.163 markus 687: char *provider = NULL, *pin;
1.194 markus 688: int r, i, version, count = 0, success = 0, confirm = 0;
689: u_int seconds;
1.174 dtucker 690: time_t death = 0;
1.194 markus 691: u_char type;
692: struct sshkey **keys = NULL, *k;
1.84 markus 693: Identity *id;
1.59 markus 694: Idtab *tab;
1.75 deraadt 695:
1.194 markus 696: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
697: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
698: fatal("%s: buffer error: %s", __func__, ssh_err(r));
699:
700: while (sshbuf_len(e->request)) {
701: if ((r = sshbuf_get_u8(e->request, &type)) != 0)
702: fatal("%s: buffer error: %s", __func__, ssh_err(r));
703: switch (type) {
1.110 djm 704: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.194 markus 705: if ((r = sshbuf_get_u32(e->request, &seconds)) != 0)
706: fatal("%s: buffer error: %s",
707: __func__, ssh_err(r));
708: death = monotime() + seconds;
1.110 djm 709: break;
710: case SSH_AGENT_CONSTRAIN_CONFIRM:
711: confirm = 1;
712: break;
713: default:
1.158 djm 714: error("process_add_smartcard_key: "
715: "Unknown constraint type %d", type);
716: goto send;
1.110 djm 717: }
718: }
719: if (lifetime && !death)
1.175 dtucker 720: death = monotime() + lifetime;
1.110 djm 721:
1.163 markus 722: count = pkcs11_add_provider(provider, pin, &keys);
723: for (i = 0; i < count; i++) {
1.84 markus 724: k = keys[i];
725: version = k->type == KEY_RSA1 ? 1 : 2;
726: tab = idtab_lookup(version);
727: if (lookup_identity(k, version) == NULL) {
1.163 markus 728: id = xcalloc(1, sizeof(Identity));
1.84 markus 729: id->key = k;
1.163 markus 730: id->provider = xstrdup(provider);
731: id->comment = xstrdup(provider); /* XXX */
1.110 djm 732: id->death = death;
733: id->confirm = confirm;
1.84 markus 734: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
735: tab->nentries++;
736: success = 1;
737: } else {
1.194 markus 738: sshkey_free(k);
1.84 markus 739: }
740: keys[i] = NULL;
1.59 markus 741: }
742: send:
1.173 djm 743: free(pin);
744: free(provider);
745: free(keys);
1.194 markus 746: send_status(e, success);
1.59 markus 747: }
748:
749: static void
750: process_remove_smartcard_key(SocketEntry *e)
751: {
1.163 markus 752: char *provider = NULL, *pin = NULL;
1.194 markus 753: int r, version, success = 0;
1.163 markus 754: Identity *id, *nxt;
1.84 markus 755: Idtab *tab;
1.59 markus 756:
1.194 markus 757: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
758: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0)
759: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.173 djm 760: free(pin);
1.59 markus 761:
1.163 markus 762: for (version = 1; version < 3; version++) {
763: tab = idtab_lookup(version);
764: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
765: nxt = TAILQ_NEXT(id, next);
1.181 djm 766: /* Skip file--based keys */
767: if (id->provider == NULL)
768: continue;
1.163 markus 769: if (!strcmp(provider, id->provider)) {
770: TAILQ_REMOVE(&tab->idlist, id, next);
771: free_identity(id);
772: tab->nentries--;
773: }
1.59 markus 774: }
775: }
1.163 markus 776: if (pkcs11_del_provider(provider) == 0)
777: success = 1;
778: else
779: error("process_remove_smartcard_key:"
780: " pkcs11_del_provider failed");
1.173 djm 781: free(provider);
1.194 markus 782: send_status(e, success);
1.59 markus 783: }
1.163 markus 784: #endif /* ENABLE_PKCS11 */
1.59 markus 785:
1.33 markus 786: /* dispatch incoming messages */
787:
1.55 itojun 788: static void
1.2 provos 789: process_message(SocketEntry *e)
1.1 deraadt 790: {
1.194 markus 791: u_int msg_len;
792: u_char type;
793: const u_char *cp;
794: int r;
1.89 markus 795:
1.194 markus 796: if (sshbuf_len(e->input) < 5)
1.21 markus 797: return; /* Incomplete message. */
1.194 markus 798: cp = sshbuf_ptr(e->input);
799: msg_len = PEEK_U32(cp);
1.21 markus 800: if (msg_len > 256 * 1024) {
1.101 stevesk 801: close_socket(e);
1.21 markus 802: return;
803: }
1.194 markus 804: if (sshbuf_len(e->input) < msg_len + 4)
1.21 markus 805: return;
1.87 markus 806:
807: /* move the current input to e->request */
1.194 markus 808: sshbuf_reset(e->request);
809: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
810: (r = sshbuf_get_u8(e->request, &type)) != 0)
811: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.21 markus 812:
1.88 markus 813: /* check wheter agent is locked */
814: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 815: sshbuf_reset(e->request);
1.88 markus 816: switch (type) {
817: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
818: case SSH2_AGENTC_REQUEST_IDENTITIES:
819: /* send empty lists */
820: no_identities(e, type);
821: break;
822: default:
823: /* send a fail message for all other request types */
1.194 markus 824: send_status(e, 0);
1.88 markus 825: }
826: return;
827: }
828:
1.59 markus 829: debug("type %d", type);
1.21 markus 830: switch (type) {
1.88 markus 831: case SSH_AGENTC_LOCK:
832: case SSH_AGENTC_UNLOCK:
833: process_lock_agent(e, type == SSH_AGENTC_LOCK);
834: break;
1.185 markus 835: #ifdef WITH_SSH1
1.33 markus 836: /* ssh1 */
837: case SSH_AGENTC_RSA_CHALLENGE:
838: process_authentication_challenge1(e);
839: break;
1.21 markus 840: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 841: process_request_identities(e, 1);
1.21 markus 842: break;
843: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 844: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 845: process_add_identity(e, 1);
1.21 markus 846: break;
847: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 848: process_remove_identity(e, 1);
1.21 markus 849: break;
850: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 851: process_remove_all_identities(e, 1);
852: break;
1.185 markus 853: #endif
1.33 markus 854: /* ssh2 */
855: case SSH2_AGENTC_SIGN_REQUEST:
856: process_sign_request2(e);
857: break;
858: case SSH2_AGENTC_REQUEST_IDENTITIES:
859: process_request_identities(e, 2);
860: break;
861: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 862: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 863: process_add_identity(e, 2);
864: break;
865: case SSH2_AGENTC_REMOVE_IDENTITY:
866: process_remove_identity(e, 2);
867: break;
868: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
869: process_remove_all_identities(e, 2);
1.21 markus 870: break;
1.163 markus 871: #ifdef ENABLE_PKCS11
1.59 markus 872: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 873: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 874: process_add_smartcard_key(e);
1.75 deraadt 875: break;
1.59 markus 876: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
877: process_remove_smartcard_key(e);
1.75 deraadt 878: break;
1.163 markus 879: #endif /* ENABLE_PKCS11 */
1.21 markus 880: default:
881: /* Unknown message. Respond with failure. */
882: error("Unknown message %d", type);
1.194 markus 883: sshbuf_reset(e->request);
884: send_status(e, 0);
1.21 markus 885: break;
886: }
1.1 deraadt 887: }
888:
1.55 itojun 889: static void
1.73 stevesk 890: new_socket(sock_type type, int fd)
1.1 deraadt 891: {
1.112 markus 892: u_int i, old_alloc, new_alloc;
1.96 deraadt 893:
1.119 djm 894: set_nonblock(fd);
1.21 markus 895:
896: if (fd > max_fd)
897: max_fd = fd;
898:
899: for (i = 0; i < sockets_alloc; i++)
900: if (sockets[i].type == AUTH_UNUSED) {
901: sockets[i].fd = fd;
1.194 markus 902: if ((sockets[i].input = sshbuf_new()) == NULL)
903: fatal("%s: sshbuf_new failed", __func__);
904: if ((sockets[i].output = sshbuf_new()) == NULL)
905: fatal("%s: sshbuf_new failed", __func__);
906: if ((sockets[i].request = sshbuf_new()) == NULL)
907: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 908: sockets[i].type = type;
1.21 markus 909: return;
910: }
911: old_alloc = sockets_alloc;
1.112 markus 912: new_alloc = sockets_alloc + 10;
1.133 djm 913: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 914: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 915: sockets[i].type = AUTH_UNUSED;
1.112 markus 916: sockets_alloc = new_alloc;
1.21 markus 917: sockets[old_alloc].fd = fd;
1.194 markus 918: if ((sockets[old_alloc].input = sshbuf_new()) == NULL)
919: fatal("%s: sshbuf_new failed", __func__);
920: if ((sockets[old_alloc].output = sshbuf_new()) == NULL)
921: fatal("%s: sshbuf_new failed", __func__);
922: if ((sockets[old_alloc].request = sshbuf_new()) == NULL)
923: fatal("%s: sshbuf_new failed", __func__);
1.112 markus 924: sockets[old_alloc].type = type;
1.1 deraadt 925: }
926:
1.55 itojun 927: static int
1.155 dtucker 928: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
929: struct timeval **tvpp)
1.1 deraadt 930: {
1.174 dtucker 931: u_int i, sz;
1.46 markus 932: int n = 0;
1.155 dtucker 933: static struct timeval tv;
1.174 dtucker 934: time_t deadline;
1.46 markus 935:
936: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 937: switch (sockets[i].type) {
938: case AUTH_SOCKET:
939: case AUTH_CONNECTION:
1.46 markus 940: n = MAX(n, sockets[i].fd);
1.21 markus 941: break;
942: case AUTH_UNUSED:
943: break;
944: default:
945: fatal("Unknown socket type %d", sockets[i].type);
946: break;
947: }
1.46 markus 948: }
949:
950: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 951: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 952: free(*fdrp);
953: free(*fdwp);
1.46 markus 954: *fdrp = xmalloc(sz);
955: *fdwp = xmalloc(sz);
1.66 markus 956: *nallocp = sz;
1.46 markus 957: }
1.66 markus 958: if (n < *fdl)
959: debug("XXX shrink: %d < %d", n, *fdl);
960: *fdl = n;
1.46 markus 961: memset(*fdrp, 0, sz);
962: memset(*fdwp, 0, sz);
963:
964: for (i = 0; i < sockets_alloc; i++) {
965: switch (sockets[i].type) {
966: case AUTH_SOCKET:
967: case AUTH_CONNECTION:
968: FD_SET(sockets[i].fd, *fdrp);
1.194 markus 969: if (sshbuf_len(sockets[i].output) > 0)
1.46 markus 970: FD_SET(sockets[i].fd, *fdwp);
971: break;
972: default:
973: break;
974: }
975: }
1.155 dtucker 976: deadline = reaper();
977: if (parent_alive_interval != 0)
978: deadline = (deadline == 0) ? parent_alive_interval :
979: MIN(deadline, parent_alive_interval);
980: if (deadline == 0) {
981: *tvpp = NULL;
982: } else {
983: tv.tv_sec = deadline;
984: tv.tv_usec = 0;
985: *tvpp = &tv;
986: }
1.46 markus 987: return (1);
1.21 markus 988: }
989:
1.55 itojun 990: static void
1.21 markus 991: after_select(fd_set *readset, fd_set *writeset)
992: {
1.96 deraadt 993: struct sockaddr_un sunaddr;
1.26 markus 994: socklen_t slen;
1.21 markus 995: char buf[1024];
1.194 markus 996: int len, sock, r;
1.162 djm 997: u_int i, orig_alloc;
1.103 markus 998: uid_t euid;
999: gid_t egid;
1.21 markus 1000:
1.162 djm 1001: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 1002: switch (sockets[i].type) {
1003: case AUTH_UNUSED:
1004: break;
1005: case AUTH_SOCKET:
1006: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 1007: slen = sizeof(sunaddr);
1.46 markus 1008: sock = accept(sockets[i].fd,
1.131 deraadt 1009: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 1010: if (sock < 0) {
1.81 stevesk 1011: error("accept from AUTH_SOCKET: %s",
1012: strerror(errno));
1.103 markus 1013: break;
1014: }
1015: if (getpeereid(sock, &euid, &egid) < 0) {
1016: error("getpeereid %d failed: %s",
1017: sock, strerror(errno));
1018: close(sock);
1019: break;
1020: }
1.105 markus 1021: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 1022: error("uid mismatch: "
1.104 stevesk 1023: "peer euid %u != uid %u",
1024: (u_int) euid, (u_int) getuid());
1.103 markus 1025: close(sock);
1.21 markus 1026: break;
1027: }
1028: new_socket(AUTH_CONNECTION, sock);
1029: }
1030: break;
1031: case AUTH_CONNECTION:
1.194 markus 1032: if (sshbuf_len(sockets[i].output) > 0 &&
1.21 markus 1033: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 1034: len = write(sockets[i].fd,
1.194 markus 1035: sshbuf_ptr(sockets[i].output),
1036: sshbuf_len(sockets[i].output));
1.162 djm 1037: if (len == -1 && (errno == EAGAIN ||
1038: errno == EINTR))
1039: continue;
1.21 markus 1040: if (len <= 0) {
1.101 stevesk 1041: close_socket(&sockets[i]);
1.21 markus 1042: break;
1043: }
1.194 markus 1044: if ((r = sshbuf_consume(sockets[i].output,
1045: len)) != 0)
1046: fatal("%s: buffer error: %s",
1047: __func__, ssh_err(r));
1.21 markus 1048: }
1049: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 1050: len = read(sockets[i].fd, buf, sizeof(buf));
1051: if (len == -1 && (errno == EAGAIN ||
1052: errno == EINTR))
1053: continue;
1.21 markus 1054: if (len <= 0) {
1.101 stevesk 1055: close_socket(&sockets[i]);
1.21 markus 1056: break;
1057: }
1.194 markus 1058: if ((r = sshbuf_put(sockets[i].input,
1059: buf, len)) != 0)
1060: fatal("%s: buffer error: %s",
1061: __func__, ssh_err(r));
1.190 dtucker 1062: explicit_bzero(buf, sizeof(buf));
1.21 markus 1063: process_message(&sockets[i]);
1064: }
1065: break;
1066: default:
1067: fatal("Unknown type %d", sockets[i].type);
1068: }
1.1 deraadt 1069: }
1070:
1.55 itojun 1071: static void
1.113 markus 1072: cleanup_socket(void)
1.15 markus 1073: {
1.187 djm 1074: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1075: return;
1076: debug("%s: cleanup", __func__);
1.48 deraadt 1077: if (socket_name[0])
1078: unlink(socket_name);
1079: if (socket_dir[0])
1080: rmdir(socket_dir);
1.10 markus 1081: }
1082:
1.114 markus 1083: void
1.15 markus 1084: cleanup_exit(int i)
1085: {
1.113 markus 1086: cleanup_socket();
1087: _exit(i);
1.15 markus 1088: }
1089:
1.135 deraadt 1090: /*ARGSUSED*/
1.55 itojun 1091: static void
1.48 deraadt 1092: cleanup_handler(int sig)
1093: {
1.113 markus 1094: cleanup_socket();
1.163 markus 1095: #ifdef ENABLE_PKCS11
1096: pkcs11_terminate();
1097: #endif
1.48 deraadt 1098: _exit(2);
1.113 markus 1099: }
1100:
1.68 markus 1101: static void
1.155 dtucker 1102: check_parent_exists(void)
1.68 markus 1103: {
1.172 dtucker 1104: /*
1105: * If our parent has exited then getppid() will return (pid_t)1,
1106: * so testing for that should be safe.
1107: */
1108: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1109: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1110: cleanup_socket();
1111: _exit(2);
1.68 markus 1112: }
1.48 deraadt 1113: }
1114:
1.55 itojun 1115: static void
1.50 itojun 1116: usage(void)
1.15 markus 1117: {
1.184 deraadt 1118: fprintf(stderr,
1.193 jmc 1119: "usage: ssh-agent [-c | -s] [-d] [-a bind_address] [-E fingerprint_hash]\n"
1120: " [-t life] [command [arg ...]]\n"
1.184 deraadt 1121: " ssh-agent [-c | -s] -k\n");
1.21 markus 1122: exit(1);
1.15 markus 1123: }
1124:
1.2 provos 1125: int
1126: main(int ac, char **av)
1.1 deraadt 1127: {
1.107 markus 1128: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1129: int sock, fd, ch, result, saved_errno;
1.120 avsm 1130: u_int nalloc;
1.96 deraadt 1131: char *shell, *format, *pidstr, *agentsocket = NULL;
1132: fd_set *readsetp = NULL, *writesetp = NULL;
1.41 markus 1133: struct rlimit rlim;
1.96 deraadt 1134: extern int optind;
1.98 stevesk 1135: extern char *optarg;
1.21 markus 1136: pid_t pid;
1.96 deraadt 1137: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1138: struct timeval *tvp = NULL;
1.161 tobias 1139: size_t len;
1.189 djm 1140: mode_t prev_mask;
1.123 djm 1141:
1142: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1143: sanitise_stdfd();
1.99 markus 1144:
1145: /* drop */
1146: setegid(getgid());
1147: setgid(getgid());
1.53 markus 1148:
1.185 markus 1149: #ifdef WITH_OPENSSL
1.170 djm 1150: OpenSSL_add_all_algorithms();
1.185 markus 1151: #endif
1.21 markus 1152:
1.192 djm 1153: while ((ch = getopt(ac, av, "cdksE:a:t:")) != -1) {
1.21 markus 1154: switch (ch) {
1.192 djm 1155: case 'E':
1156: fingerprint_hash = ssh_digest_alg_by_name(optarg);
1157: if (fingerprint_hash == -1)
1158: fatal("Invalid hash algorithm \"%s\"", optarg);
1159: break;
1.21 markus 1160: case 'c':
1161: if (s_flag)
1162: usage();
1163: c_flag++;
1164: break;
1165: case 'k':
1166: k_flag++;
1167: break;
1168: case 's':
1169: if (c_flag)
1170: usage();
1171: s_flag++;
1172: break;
1.57 markus 1173: case 'd':
1174: if (d_flag)
1175: usage();
1176: d_flag++;
1177: break;
1.86 markus 1178: case 'a':
1179: agentsocket = optarg;
1.106 marc 1180: break;
1181: case 't':
1182: if ((lifetime = convtime(optarg)) == -1) {
1183: fprintf(stderr, "Invalid lifetime\n");
1184: usage();
1185: }
1.86 markus 1186: break;
1.21 markus 1187: default:
1188: usage();
1189: }
1190: }
1191: ac -= optind;
1192: av += optind;
1193:
1.57 markus 1194: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1195: usage();
1196:
1.85 markus 1197: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1198: shell = getenv("SHELL");
1.161 tobias 1199: if (shell != NULL && (len = strlen(shell)) > 2 &&
1200: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1201: c_flag = 1;
1202: }
1203: if (k_flag) {
1.136 deraadt 1204: const char *errstr = NULL;
1205:
1.21 markus 1206: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1207: if (pidstr == NULL) {
1208: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1209: SSH_AGENTPID_ENV_NAME);
1.21 markus 1210: exit(1);
1211: }
1.136 deraadt 1212: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1213: if (errstr) {
1214: fprintf(stderr,
1215: "%s=\"%s\", which is not a good PID: %s\n",
1216: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1217: exit(1);
1218: }
1219: if (kill(pid, SIGTERM) == -1) {
1220: perror("kill");
1221: exit(1);
1222: }
1223: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1224: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1225: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1226: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1227: exit(0);
1228: }
1229: parent_pid = getpid();
1230:
1.86 markus 1231: if (agentsocket == NULL) {
1232: /* Create private directory for agent socket */
1.171 djm 1233: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1234: if (mkdtemp(socket_dir) == NULL) {
1235: perror("mkdtemp: private socket dir");
1236: exit(1);
1237: }
1.91 mpech 1238: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1239: (long)parent_pid);
1.86 markus 1240: } else {
1241: /* Try to use specified agent socket */
1242: socket_dir[0] = '\0';
1243: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1244: }
1245:
1.23 markus 1246: /*
1247: * Create socket early so it will exist before command gets run from
1248: * the parent.
1249: */
1.189 djm 1250: prev_mask = umask(0177);
1.188 millert 1251: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 1252: if (sock < 0) {
1.188 millert 1253: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 1254: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1255: cleanup_exit(1);
1256: }
1.189 djm 1257: umask(prev_mask);
1.46 markus 1258:
1.23 markus 1259: /*
1260: * Fork, and have the parent execute the command, if any, or present
1261: * the socket data. The child continues as the authentication agent.
1262: */
1.57 markus 1263: if (d_flag) {
1264: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1265: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1266: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1267: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1268: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1269: goto skip;
1270: }
1.21 markus 1271: pid = fork();
1272: if (pid == -1) {
1273: perror("fork");
1.81 stevesk 1274: cleanup_exit(1);
1.21 markus 1275: }
1276: if (pid != 0) { /* Parent - execute the given command. */
1277: close(sock);
1.91 mpech 1278: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1279: if (ac == 0) {
1280: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1281: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1282: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1283: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1284: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1285: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1286: exit(0);
1287: }
1.36 deraadt 1288: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1289: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1290: perror("setenv");
1291: exit(1);
1292: }
1.21 markus 1293: execvp(av[0], av);
1294: perror(av[0]);
1295: exit(1);
1296: }
1.81 stevesk 1297: /* child */
1298: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1299:
1300: if (setsid() == -1) {
1.81 stevesk 1301: error("setsid: %s", strerror(errno));
1.67 stevesk 1302: cleanup_exit(1);
1303: }
1304:
1305: (void)chdir("/");
1.107 markus 1306: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1307: /* XXX might close listen socket */
1308: (void)dup2(fd, STDIN_FILENO);
1309: (void)dup2(fd, STDOUT_FILENO);
1310: (void)dup2(fd, STDERR_FILENO);
1311: if (fd > 2)
1312: close(fd);
1313: }
1.21 markus 1314:
1.41 markus 1315: /* deny core dumps, since memory contains unencrypted private keys */
1316: rlim.rlim_cur = rlim.rlim_max = 0;
1317: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1318: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1319: cleanup_exit(1);
1320: }
1.57 markus 1321:
1322: skip:
1.187 djm 1323:
1324: cleanup_pid = getpid();
1.163 markus 1325:
1326: #ifdef ENABLE_PKCS11
1327: pkcs11_init(0);
1328: #endif
1.21 markus 1329: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1330: if (ac > 0)
1331: parent_alive_interval = 10;
1.33 markus 1332: idtab_init();
1.61 markus 1333: signal(SIGPIPE, SIG_IGN);
1.177 djm 1334: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1335: signal(SIGHUP, cleanup_handler);
1336: signal(SIGTERM, cleanup_handler);
1.66 markus 1337: nalloc = 0;
1338:
1.21 markus 1339: while (1) {
1.155 dtucker 1340: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1341: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1342: saved_errno = errno;
1.155 dtucker 1343: if (parent_alive_interval != 0)
1344: check_parent_exists();
1345: (void) reaper(); /* remove expired keys */
1.154 dtucker 1346: if (result < 0) {
1347: if (saved_errno == EINTR)
1.21 markus 1348: continue;
1.154 dtucker 1349: fatal("select: %s", strerror(saved_errno));
1350: } else if (result > 0)
1351: after_select(readsetp, writesetp);
1.15 markus 1352: }
1.21 markus 1353: /* NOTREACHED */
1.1 deraadt 1354: }
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