Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.145
1.145 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.144 2006/07/17 01:31:10 stevesk 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:
37: #include "includes.h"
1.125 stevesk 38:
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.128 stevesk 43: #include <sys/un.h>
1.126 stevesk 44:
1.143 stevesk 45: #include <errno.h>
1.142 stevesk 46: #include <fcntl.h>
1.126 stevesk 47: #include <paths.h>
1.129 stevesk 48: #include <signal.h>
1.145 ! stevesk 49: #include <time.h>
1.144 stevesk 50: #include <unistd.h>
1.47 markus 51:
52: #include <openssl/evp.h>
53: #include <openssl/md5.h>
1.1 deraadt 54:
55: #include "ssh.h"
56: #include "rsa.h"
57: #include "buffer.h"
58: #include "bufaux.h"
59: #include "xmalloc.h"
1.32 markus 60: #include "key.h"
61: #include "authfd.h"
1.37 markus 62: #include "compat.h"
1.47 markus 63: #include "log.h"
1.107 markus 64: #include "misc.h"
1.7 deraadt 65:
1.59 markus 66: #ifdef SMARTCARD
67: #include "scard.h"
1.71 jakob 68: #endif
1.59 markus 69:
1.73 stevesk 70: typedef enum {
71: AUTH_UNUSED,
72: AUTH_SOCKET,
73: AUTH_CONNECTION
74: } sock_type;
75:
1.21 markus 76: typedef struct {
77: int fd;
1.73 stevesk 78: sock_type type;
1.21 markus 79: Buffer input;
80: Buffer output;
1.87 markus 81: Buffer request;
1.1 deraadt 82: } SocketEntry;
83:
1.45 markus 84: u_int sockets_alloc = 0;
1.1 deraadt 85: SocketEntry *sockets = NULL;
86:
1.78 provos 87: typedef struct identity {
88: TAILQ_ENTRY(identity) next;
1.33 markus 89: Key *key;
1.21 markus 90: char *comment;
1.89 markus 91: u_int death;
1.107 markus 92: u_int confirm;
1.1 deraadt 93: } Identity;
94:
1.33 markus 95: typedef struct {
96: int nentries;
1.78 provos 97: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 98: } Idtab;
99:
100: /* private key table, one per protocol version */
101: Idtab idtable[3];
1.1 deraadt 102:
103: int max_fd = 0;
104:
1.11 markus 105: /* pid of shell == parent of agent */
1.29 deraadt 106: pid_t parent_pid = -1;
1.10 markus 107:
108: /* pathname and directory for AUTH_SOCKET */
1.132 djm 109: char socket_name[MAXPATHLEN];
110: char socket_dir[MAXPATHLEN];
1.10 markus 111:
1.88 markus 112: /* locking */
113: int locked = 0;
114: char *lock_passwd = NULL;
115:
1.20 markus 116: extern char *__progname;
117:
1.106 marc 118: /* Default lifetime (0 == forever) */
119: static int lifetime = 0;
120:
1.55 itojun 121: static void
1.101 stevesk 122: close_socket(SocketEntry *e)
123: {
124: close(e->fd);
125: e->fd = -1;
126: e->type = AUTH_UNUSED;
127: buffer_free(&e->input);
128: buffer_free(&e->output);
129: buffer_free(&e->request);
130: }
131:
132: static void
1.33 markus 133: idtab_init(void)
1.1 deraadt 134: {
1.33 markus 135: int i;
1.96 deraadt 136:
1.74 deraadt 137: for (i = 0; i <=2; i++) {
1.78 provos 138: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 139: idtable[i].nentries = 0;
140: }
141: }
142:
143: /* return private key table for requested protocol version */
1.55 itojun 144: static Idtab *
1.33 markus 145: idtab_lookup(int version)
146: {
147: if (version < 1 || version > 2)
148: fatal("internal error, bad protocol version %d", version);
149: return &idtable[version];
150: }
151:
1.89 markus 152: static void
153: free_identity(Identity *id)
154: {
155: key_free(id->key);
156: xfree(id->comment);
157: xfree(id);
158: }
159:
1.33 markus 160: /* return matching private key for given public key */
1.78 provos 161: static Identity *
162: lookup_identity(Key *key, int version)
1.33 markus 163: {
1.78 provos 164: Identity *id;
165:
1.33 markus 166: Idtab *tab = idtab_lookup(version);
1.78 provos 167: TAILQ_FOREACH(id, &tab->idlist, next) {
168: if (key_equal(key, id->key))
169: return (id);
1.33 markus 170: }
1.78 provos 171: return (NULL);
172: }
173:
1.107 markus 174: /* Check confirmation of keysign request */
175: static int
176: confirm_key(Identity *id)
177: {
1.122 djm 178: char *p;
1.107 markus 179: int ret = -1;
180:
181: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 182: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
183: id->comment, p))
184: ret = 0;
1.107 markus 185: xfree(p);
1.122 djm 186:
1.107 markus 187: return (ret);
188: }
189:
1.33 markus 190: /* send list of supported public keys to 'client' */
1.55 itojun 191: static void
1.33 markus 192: process_request_identities(SocketEntry *e, int version)
193: {
194: Idtab *tab = idtab_lookup(version);
1.96 deraadt 195: Identity *id;
1.21 markus 196: Buffer msg;
1.1 deraadt 197:
1.21 markus 198: buffer_init(&msg);
1.33 markus 199: buffer_put_char(&msg, (version == 1) ?
200: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
201: buffer_put_int(&msg, tab->nentries);
1.78 provos 202: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 203: if (id->key->type == KEY_RSA1) {
1.33 markus 204: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
205: buffer_put_bignum(&msg, id->key->rsa->e);
206: buffer_put_bignum(&msg, id->key->rsa->n);
207: } else {
1.45 markus 208: u_char *blob;
209: u_int blen;
1.39 markus 210: key_to_blob(id->key, &blob, &blen);
1.33 markus 211: buffer_put_string(&msg, blob, blen);
212: xfree(blob);
213: }
214: buffer_put_cstring(&msg, id->comment);
1.21 markus 215: }
216: buffer_put_int(&e->output, buffer_len(&msg));
217: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
218: buffer_free(&msg);
1.1 deraadt 219: }
220:
1.33 markus 221: /* ssh1 only */
1.55 itojun 222: static void
1.33 markus 223: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 224: {
1.96 deraadt 225: u_char buf[32], mdbuf[16], session_id[16];
226: u_int response_type;
227: BIGNUM *challenge;
1.78 provos 228: Identity *id;
1.33 markus 229: int i, len;
1.21 markus 230: Buffer msg;
231: MD5_CTX md;
1.96 deraadt 232: Key *key;
1.21 markus 233:
234: buffer_init(&msg);
1.39 markus 235: key = key_new(KEY_RSA1);
1.76 markus 236: if ((challenge = BN_new()) == NULL)
237: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 238:
1.97 markus 239: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 240: buffer_get_bignum(&e->request, key->rsa->e);
241: buffer_get_bignum(&e->request, key->rsa->n);
242: buffer_get_bignum(&e->request, challenge);
1.21 markus 243:
1.33 markus 244: /* Only protocol 1.1 is supported */
1.87 markus 245: if (buffer_len(&e->request) == 0)
1.33 markus 246: goto failure;
1.87 markus 247: buffer_get(&e->request, session_id, 16);
248: response_type = buffer_get_int(&e->request);
1.33 markus 249: if (response_type != 1)
250: goto failure;
251:
1.78 provos 252: id = lookup_identity(key, 1);
1.107 markus 253: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 254: Key *private = id->key;
1.33 markus 255: /* Decrypt the challenge using the private key. */
1.49 markus 256: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
257: goto failure;
1.33 markus 258:
259: /* The response is MD5 of decrypted challenge plus session id. */
260: len = BN_num_bytes(challenge);
261: if (len <= 0 || len > 32) {
1.109 itojun 262: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 263: goto failure;
264: }
265: memset(buf, 0, 32);
266: BN_bn2bin(challenge, buf + 32 - len);
267: MD5_Init(&md);
268: MD5_Update(&md, buf, 32);
269: MD5_Update(&md, session_id, 16);
270: MD5_Final(mdbuf, &md);
271:
272: /* Send the response. */
273: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
274: for (i = 0; i < 16; i++)
275: buffer_put_char(&msg, mdbuf[i]);
276: goto send;
277: }
1.21 markus 278:
1.33 markus 279: failure:
280: /* Unknown identity or protocol error. Send failure. */
1.21 markus 281: buffer_put_char(&msg, SSH_AGENT_FAILURE);
282: send:
283: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 284: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
285: key_free(key);
286: BN_clear_free(challenge);
287: buffer_free(&msg);
288: }
289:
290: /* ssh2 only */
1.55 itojun 291: static void
1.33 markus 292: process_sign_request2(SocketEntry *e)
293: {
1.45 markus 294: u_char *blob, *data, *signature = NULL;
295: u_int blen, dlen, slen = 0;
1.96 deraadt 296: extern int datafellows;
297: int ok = -1, flags;
1.33 markus 298: Buffer msg;
1.96 deraadt 299: Key *key;
1.33 markus 300:
301: datafellows = 0;
1.43 markus 302:
1.87 markus 303: blob = buffer_get_string(&e->request, &blen);
304: data = buffer_get_string(&e->request, &dlen);
1.37 markus 305:
1.87 markus 306: flags = buffer_get_int(&e->request);
1.37 markus 307: if (flags & SSH_AGENT_OLD_SIGNATURE)
308: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 309:
1.39 markus 310: key = key_from_blob(blob, blen);
1.33 markus 311: if (key != NULL) {
1.78 provos 312: Identity *id = lookup_identity(key, 2);
1.107 markus 313: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 314: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 315: key_free(key);
1.33 markus 316: }
317: buffer_init(&msg);
318: if (ok == 0) {
319: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
320: buffer_put_string(&msg, signature, slen);
321: } else {
322: buffer_put_char(&msg, SSH_AGENT_FAILURE);
323: }
324: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 325: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 326: buffer_len(&msg));
1.21 markus 327: buffer_free(&msg);
1.33 markus 328: xfree(data);
329: xfree(blob);
330: if (signature != NULL)
331: xfree(signature);
1.1 deraadt 332: }
333:
1.33 markus 334: /* shared */
1.55 itojun 335: static void
1.33 markus 336: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 337: {
1.96 deraadt 338: u_int blen, bits;
339: int success = 0;
1.78 provos 340: Key *key = NULL;
1.45 markus 341: u_char *blob;
1.21 markus 342:
1.74 deraadt 343: switch (version) {
1.33 markus 344: case 1:
1.39 markus 345: key = key_new(KEY_RSA1);
1.87 markus 346: bits = buffer_get_int(&e->request);
347: buffer_get_bignum(&e->request, key->rsa->e);
348: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 349:
350: if (bits != key_size(key))
1.109 itojun 351: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 352: key_size(key), bits);
1.33 markus 353: break;
354: case 2:
1.87 markus 355: blob = buffer_get_string(&e->request, &blen);
1.39 markus 356: key = key_from_blob(blob, blen);
1.33 markus 357: xfree(blob);
358: break;
359: }
360: if (key != NULL) {
1.78 provos 361: Identity *id = lookup_identity(key, version);
362: if (id != NULL) {
1.23 markus 363: /*
364: * We have this key. Free the old key. Since we
1.124 djm 365: * don't want to leave empty slots in the middle of
1.40 markus 366: * the array, we actually free the key there and move
367: * all the entries between the empty slot and the end
368: * of the array.
1.23 markus 369: */
1.33 markus 370: Idtab *tab = idtab_lookup(version);
1.38 markus 371: if (tab->nentries < 1)
372: fatal("process_remove_identity: "
373: "internal error: tab->nentries %d",
374: tab->nentries);
1.78 provos 375: TAILQ_REMOVE(&tab->idlist, id, next);
376: free_identity(id);
1.33 markus 377: tab->nentries--;
378: success = 1;
1.21 markus 379: }
1.33 markus 380: key_free(key);
381: }
1.1 deraadt 382: buffer_put_int(&e->output, 1);
1.33 markus 383: buffer_put_char(&e->output,
384: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 385: }
386:
1.55 itojun 387: static void
1.33 markus 388: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 389: {
1.33 markus 390: Idtab *tab = idtab_lookup(version);
1.78 provos 391: Identity *id;
1.21 markus 392:
393: /* Loop over all identities and clear the keys. */
1.78 provos 394: for (id = TAILQ_FIRST(&tab->idlist); id;
395: id = TAILQ_FIRST(&tab->idlist)) {
396: TAILQ_REMOVE(&tab->idlist, id, next);
397: free_identity(id);
1.21 markus 398: }
399:
400: /* Mark that there are no identities. */
1.33 markus 401: tab->nentries = 0;
1.21 markus 402:
403: /* Send success. */
404: buffer_put_int(&e->output, 1);
405: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 406: }
407:
1.55 itojun 408: static void
1.89 markus 409: reaper(void)
410: {
1.96 deraadt 411: u_int now = time(NULL);
1.89 markus 412: Identity *id, *nxt;
413: int version;
1.96 deraadt 414: Idtab *tab;
1.89 markus 415:
416: for (version = 1; version < 3; version++) {
417: tab = idtab_lookup(version);
418: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
419: nxt = TAILQ_NEXT(id, next);
420: if (id->death != 0 && now >= id->death) {
421: TAILQ_REMOVE(&tab->idlist, id, next);
422: free_identity(id);
423: tab->nentries--;
424: }
425: }
426: }
427: }
428:
429: static void
1.33 markus 430: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 431: {
1.96 deraadt 432: Idtab *tab = idtab_lookup(version);
1.107 markus 433: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 434: char *type_name, *comment;
1.33 markus 435: Key *k = NULL;
436:
437: switch (version) {
438: case 1:
1.39 markus 439: k = key_new_private(KEY_RSA1);
1.97 markus 440: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 441: buffer_get_bignum(&e->request, k->rsa->n);
442: buffer_get_bignum(&e->request, k->rsa->e);
443: buffer_get_bignum(&e->request, k->rsa->d);
444: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 445:
446: /* SSH and SSL have p and q swapped */
1.87 markus 447: buffer_get_bignum(&e->request, k->rsa->q); /* p */
448: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 449:
450: /* Generate additional parameters */
1.60 markus 451: rsa_generate_additional_parameters(k->rsa);
1.33 markus 452: break;
453: case 2:
1.87 markus 454: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 455: type = key_type_from_name(type_name);
1.39 markus 456: xfree(type_name);
1.74 deraadt 457: switch (type) {
1.39 markus 458: case KEY_DSA:
459: k = key_new_private(type);
1.87 markus 460: buffer_get_bignum2(&e->request, k->dsa->p);
461: buffer_get_bignum2(&e->request, k->dsa->q);
462: buffer_get_bignum2(&e->request, k->dsa->g);
463: buffer_get_bignum2(&e->request, k->dsa->pub_key);
464: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 465: break;
466: case KEY_RSA:
467: k = key_new_private(type);
1.87 markus 468: buffer_get_bignum2(&e->request, k->rsa->n);
469: buffer_get_bignum2(&e->request, k->rsa->e);
470: buffer_get_bignum2(&e->request, k->rsa->d);
471: buffer_get_bignum2(&e->request, k->rsa->iqmp);
472: buffer_get_bignum2(&e->request, k->rsa->p);
473: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 474:
475: /* Generate additional parameters */
1.60 markus 476: rsa_generate_additional_parameters(k->rsa);
1.39 markus 477: break;
478: default:
1.87 markus 479: buffer_clear(&e->request);
1.108 markus 480: goto send;
481: }
482: break;
483: }
484: /* enable blinding */
485: switch (k->type) {
486: case KEY_RSA:
487: case KEY_RSA1:
488: if (RSA_blinding_on(k->rsa, NULL) != 1) {
489: error("process_add_identity: RSA_blinding_on failed");
490: key_free(k);
1.33 markus 491: goto send;
1.21 markus 492: }
1.33 markus 493: break;
494: }
1.87 markus 495: comment = buffer_get_string(&e->request, NULL);
1.33 markus 496: if (k == NULL) {
497: xfree(comment);
498: goto send;
499: }
500: success = 1;
1.94 markus 501: while (buffer_len(&e->request)) {
502: switch (buffer_get_char(&e->request)) {
503: case SSH_AGENT_CONSTRAIN_LIFETIME:
504: death = time(NULL) + buffer_get_int(&e->request);
505: break;
1.107 markus 506: case SSH_AGENT_CONSTRAIN_CONFIRM:
507: confirm = 1;
508: break;
1.94 markus 509: default:
510: break;
511: }
512: }
1.106 marc 513: if (lifetime && !death)
514: death = time(NULL) + lifetime;
1.78 provos 515: if (lookup_identity(k, version) == NULL) {
516: Identity *id = xmalloc(sizeof(Identity));
517: id->key = k;
518: id->comment = comment;
1.94 markus 519: id->death = death;
1.107 markus 520: id->confirm = confirm;
1.78 provos 521: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 522: /* Increment the number of identities. */
523: tab->nentries++;
524: } else {
525: key_free(k);
526: xfree(comment);
527: }
528: send:
1.1 deraadt 529: buffer_put_int(&e->output, 1);
1.33 markus 530: buffer_put_char(&e->output,
531: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 532: }
533:
1.88 markus 534: /* XXX todo: encrypt sensitive data with passphrase */
535: static void
536: process_lock_agent(SocketEntry *e, int lock)
537: {
1.96 deraadt 538: int success = 0;
1.88 markus 539: char *passwd;
540:
541: passwd = buffer_get_string(&e->request, NULL);
542: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
543: locked = 0;
544: memset(lock_passwd, 0, strlen(lock_passwd));
545: xfree(lock_passwd);
546: lock_passwd = NULL;
547: success = 1;
548: } else if (!locked && lock) {
549: locked = 1;
550: lock_passwd = xstrdup(passwd);
551: success = 1;
552: }
553: memset(passwd, 0, strlen(passwd));
554: xfree(passwd);
1.95 deraadt 555:
1.88 markus 556: buffer_put_int(&e->output, 1);
557: buffer_put_char(&e->output,
558: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
559: }
560:
561: static void
562: no_identities(SocketEntry *e, u_int type)
563: {
564: Buffer msg;
565:
566: buffer_init(&msg);
567: buffer_put_char(&msg,
568: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
569: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
570: buffer_put_int(&msg, 0);
571: buffer_put_int(&e->output, buffer_len(&msg));
572: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
573: buffer_free(&msg);
574: }
1.59 markus 575:
576: #ifdef SMARTCARD
577: static void
578: process_add_smartcard_key (SocketEntry *e)
579: {
1.96 deraadt 580: char *sc_reader_id = NULL, *pin;
1.110 djm 581: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 582: Key **keys, *k;
1.84 markus 583: Identity *id;
1.59 markus 584: Idtab *tab;
1.75 deraadt 585:
1.87 markus 586: sc_reader_id = buffer_get_string(&e->request, NULL);
587: pin = buffer_get_string(&e->request, NULL);
1.110 djm 588:
589: while (buffer_len(&e->request)) {
590: switch (buffer_get_char(&e->request)) {
591: case SSH_AGENT_CONSTRAIN_LIFETIME:
592: death = time(NULL) + buffer_get_int(&e->request);
593: break;
594: case SSH_AGENT_CONSTRAIN_CONFIRM:
595: confirm = 1;
596: break;
597: default:
598: break;
599: }
600: }
601: if (lifetime && !death)
602: death = time(NULL) + lifetime;
603:
1.84 markus 604: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 605: xfree(sc_reader_id);
1.83 rees 606: xfree(pin);
1.59 markus 607:
1.84 markus 608: if (keys == NULL || keys[0] == NULL) {
609: error("sc_get_keys failed");
1.59 markus 610: goto send;
611: }
1.84 markus 612: for (i = 0; keys[i] != NULL; i++) {
613: k = keys[i];
614: version = k->type == KEY_RSA1 ? 1 : 2;
615: tab = idtab_lookup(version);
616: if (lookup_identity(k, version) == NULL) {
617: id = xmalloc(sizeof(Identity));
618: id->key = k;
1.111 markus 619: id->comment = sc_get_key_label(k);
1.110 djm 620: id->death = death;
621: id->confirm = confirm;
1.84 markus 622: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
623: tab->nentries++;
624: success = 1;
625: } else {
626: key_free(k);
627: }
628: keys[i] = NULL;
1.59 markus 629: }
1.84 markus 630: xfree(keys);
1.59 markus 631: send:
632: buffer_put_int(&e->output, 1);
633: buffer_put_char(&e->output,
634: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
635: }
636:
637: static void
638: process_remove_smartcard_key(SocketEntry *e)
639: {
1.96 deraadt 640: char *sc_reader_id = NULL, *pin;
641: int i, version, success = 0;
642: Key **keys, *k = NULL;
1.84 markus 643: Identity *id;
644: Idtab *tab;
1.59 markus 645:
1.87 markus 646: sc_reader_id = buffer_get_string(&e->request, NULL);
647: pin = buffer_get_string(&e->request, NULL);
1.84 markus 648: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 649: xfree(sc_reader_id);
1.83 rees 650: xfree(pin);
1.59 markus 651:
1.84 markus 652: if (keys == NULL || keys[0] == NULL) {
653: error("sc_get_keys failed");
654: goto send;
655: }
656: for (i = 0; keys[i] != NULL; i++) {
657: k = keys[i];
658: version = k->type == KEY_RSA1 ? 1 : 2;
659: if ((id = lookup_identity(k, version)) != NULL) {
660: tab = idtab_lookup(version);
1.90 markus 661: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 662: tab->nentries--;
1.78 provos 663: free_identity(id);
1.59 markus 664: success = 1;
665: }
666: key_free(k);
1.84 markus 667: keys[i] = NULL;
1.59 markus 668: }
1.84 markus 669: xfree(keys);
670: send:
1.59 markus 671: buffer_put_int(&e->output, 1);
672: buffer_put_char(&e->output,
673: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
674: }
1.70 jakob 675: #endif /* SMARTCARD */
1.59 markus 676:
1.33 markus 677: /* dispatch incoming messages */
678:
1.55 itojun 679: static void
1.2 provos 680: process_message(SocketEntry *e)
1.1 deraadt 681: {
1.96 deraadt 682: u_int msg_len, type;
1.45 markus 683: u_char *cp;
1.89 markus 684:
685: /* kill dead keys */
686: reaper();
687:
1.21 markus 688: if (buffer_len(&e->input) < 5)
689: return; /* Incomplete message. */
1.77 stevesk 690: cp = buffer_ptr(&e->input);
1.137 djm 691: msg_len = get_u32(cp);
1.21 markus 692: if (msg_len > 256 * 1024) {
1.101 stevesk 693: close_socket(e);
1.21 markus 694: return;
695: }
696: if (buffer_len(&e->input) < msg_len + 4)
697: return;
1.87 markus 698:
699: /* move the current input to e->request */
1.21 markus 700: buffer_consume(&e->input, 4);
1.87 markus 701: buffer_clear(&e->request);
702: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
703: buffer_consume(&e->input, msg_len);
704: type = buffer_get_char(&e->request);
1.21 markus 705:
1.88 markus 706: /* check wheter agent is locked */
707: if (locked && type != SSH_AGENTC_UNLOCK) {
708: buffer_clear(&e->request);
709: switch (type) {
710: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
711: case SSH2_AGENTC_REQUEST_IDENTITIES:
712: /* send empty lists */
713: no_identities(e, type);
714: break;
715: default:
716: /* send a fail message for all other request types */
717: buffer_put_int(&e->output, 1);
718: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
719: }
720: return;
721: }
722:
1.59 markus 723: debug("type %d", type);
1.21 markus 724: switch (type) {
1.88 markus 725: case SSH_AGENTC_LOCK:
726: case SSH_AGENTC_UNLOCK:
727: process_lock_agent(e, type == SSH_AGENTC_LOCK);
728: break;
1.33 markus 729: /* ssh1 */
730: case SSH_AGENTC_RSA_CHALLENGE:
731: process_authentication_challenge1(e);
732: break;
1.21 markus 733: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 734: process_request_identities(e, 1);
1.21 markus 735: break;
736: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 737: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 738: process_add_identity(e, 1);
1.21 markus 739: break;
740: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 741: process_remove_identity(e, 1);
1.21 markus 742: break;
743: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 744: process_remove_all_identities(e, 1);
745: break;
746: /* ssh2 */
747: case SSH2_AGENTC_SIGN_REQUEST:
748: process_sign_request2(e);
749: break;
750: case SSH2_AGENTC_REQUEST_IDENTITIES:
751: process_request_identities(e, 2);
752: break;
753: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 754: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 755: process_add_identity(e, 2);
756: break;
757: case SSH2_AGENTC_REMOVE_IDENTITY:
758: process_remove_identity(e, 2);
759: break;
760: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
761: process_remove_all_identities(e, 2);
1.21 markus 762: break;
1.59 markus 763: #ifdef SMARTCARD
764: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 765: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 766: process_add_smartcard_key(e);
1.75 deraadt 767: break;
1.59 markus 768: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
769: process_remove_smartcard_key(e);
1.75 deraadt 770: break;
1.70 jakob 771: #endif /* SMARTCARD */
1.21 markus 772: default:
773: /* Unknown message. Respond with failure. */
774: error("Unknown message %d", type);
1.87 markus 775: buffer_clear(&e->request);
1.21 markus 776: buffer_put_int(&e->output, 1);
777: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
778: break;
779: }
1.1 deraadt 780: }
781:
1.55 itojun 782: static void
1.73 stevesk 783: new_socket(sock_type type, int fd)
1.1 deraadt 784: {
1.112 markus 785: u_int i, old_alloc, new_alloc;
1.96 deraadt 786:
1.119 djm 787: set_nonblock(fd);
1.21 markus 788:
789: if (fd > max_fd)
790: max_fd = fd;
791:
792: for (i = 0; i < sockets_alloc; i++)
793: if (sockets[i].type == AUTH_UNUSED) {
794: sockets[i].fd = fd;
795: buffer_init(&sockets[i].input);
796: buffer_init(&sockets[i].output);
1.87 markus 797: buffer_init(&sockets[i].request);
1.112 markus 798: sockets[i].type = type;
1.21 markus 799: return;
800: }
801: old_alloc = sockets_alloc;
1.112 markus 802: new_alloc = sockets_alloc + 10;
1.133 djm 803: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 804: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 805: sockets[i].type = AUTH_UNUSED;
1.112 markus 806: sockets_alloc = new_alloc;
1.21 markus 807: sockets[old_alloc].fd = fd;
808: buffer_init(&sockets[old_alloc].input);
809: buffer_init(&sockets[old_alloc].output);
1.87 markus 810: buffer_init(&sockets[old_alloc].request);
1.112 markus 811: sockets[old_alloc].type = type;
1.1 deraadt 812: }
813:
1.55 itojun 814: static int
1.120 avsm 815: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 816: {
1.46 markus 817: u_int i, sz;
818: int n = 0;
819:
820: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 821: switch (sockets[i].type) {
822: case AUTH_SOCKET:
823: case AUTH_CONNECTION:
1.46 markus 824: n = MAX(n, sockets[i].fd);
1.21 markus 825: break;
826: case AUTH_UNUSED:
827: break;
828: default:
829: fatal("Unknown socket type %d", sockets[i].type);
830: break;
831: }
1.46 markus 832: }
833:
834: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 835: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 836: if (*fdrp)
1.54 stevesk 837: xfree(*fdrp);
1.46 markus 838: if (*fdwp)
1.54 stevesk 839: xfree(*fdwp);
1.46 markus 840: *fdrp = xmalloc(sz);
841: *fdwp = xmalloc(sz);
1.66 markus 842: *nallocp = sz;
1.46 markus 843: }
1.66 markus 844: if (n < *fdl)
845: debug("XXX shrink: %d < %d", n, *fdl);
846: *fdl = n;
1.46 markus 847: memset(*fdrp, 0, sz);
848: memset(*fdwp, 0, sz);
849:
850: for (i = 0; i < sockets_alloc; i++) {
851: switch (sockets[i].type) {
852: case AUTH_SOCKET:
853: case AUTH_CONNECTION:
854: FD_SET(sockets[i].fd, *fdrp);
855: if (buffer_len(&sockets[i].output) > 0)
856: FD_SET(sockets[i].fd, *fdwp);
857: break;
858: default:
859: break;
860: }
861: }
862: return (1);
1.21 markus 863: }
864:
1.55 itojun 865: static void
1.21 markus 866: after_select(fd_set *readset, fd_set *writeset)
867: {
1.96 deraadt 868: struct sockaddr_un sunaddr;
1.26 markus 869: socklen_t slen;
1.21 markus 870: char buf[1024];
1.96 deraadt 871: int len, sock;
872: u_int i;
1.103 markus 873: uid_t euid;
874: gid_t egid;
1.21 markus 875:
876: for (i = 0; i < sockets_alloc; i++)
877: switch (sockets[i].type) {
878: case AUTH_UNUSED:
879: break;
880: case AUTH_SOCKET:
881: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 882: slen = sizeof(sunaddr);
1.46 markus 883: sock = accept(sockets[i].fd,
1.131 deraadt 884: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 885: if (sock < 0) {
1.81 stevesk 886: error("accept from AUTH_SOCKET: %s",
887: strerror(errno));
1.103 markus 888: break;
889: }
890: if (getpeereid(sock, &euid, &egid) < 0) {
891: error("getpeereid %d failed: %s",
892: sock, strerror(errno));
893: close(sock);
894: break;
895: }
1.105 markus 896: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 897: error("uid mismatch: "
1.104 stevesk 898: "peer euid %u != uid %u",
899: (u_int) euid, (u_int) getuid());
1.103 markus 900: close(sock);
1.21 markus 901: break;
902: }
903: new_socket(AUTH_CONNECTION, sock);
904: }
905: break;
906: case AUTH_CONNECTION:
907: if (buffer_len(&sockets[i].output) > 0 &&
908: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 909: do {
910: len = write(sockets[i].fd,
911: buffer_ptr(&sockets[i].output),
912: buffer_len(&sockets[i].output));
913: if (len == -1 && (errno == EAGAIN ||
914: errno == EINTR))
915: continue;
916: break;
917: } while (1);
1.21 markus 918: if (len <= 0) {
1.101 stevesk 919: close_socket(&sockets[i]);
1.21 markus 920: break;
921: }
922: buffer_consume(&sockets[i].output, len);
923: }
924: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 925: do {
926: len = read(sockets[i].fd, buf, sizeof(buf));
927: if (len == -1 && (errno == EAGAIN ||
928: errno == EINTR))
929: continue;
930: break;
931: } while (1);
1.21 markus 932: if (len <= 0) {
1.101 stevesk 933: close_socket(&sockets[i]);
1.21 markus 934: break;
935: }
936: buffer_append(&sockets[i].input, buf, len);
937: process_message(&sockets[i]);
938: }
939: break;
940: default:
941: fatal("Unknown type %d", sockets[i].type);
942: }
1.1 deraadt 943: }
944:
1.55 itojun 945: static void
1.113 markus 946: cleanup_socket(void)
1.15 markus 947: {
1.48 deraadt 948: if (socket_name[0])
949: unlink(socket_name);
950: if (socket_dir[0])
951: rmdir(socket_dir);
1.10 markus 952: }
953:
1.114 markus 954: void
1.15 markus 955: cleanup_exit(int i)
956: {
1.113 markus 957: cleanup_socket();
958: _exit(i);
1.15 markus 959: }
960:
1.135 deraadt 961: /*ARGSUSED*/
1.55 itojun 962: static void
1.48 deraadt 963: cleanup_handler(int sig)
964: {
1.113 markus 965: cleanup_socket();
1.48 deraadt 966: _exit(2);
1.113 markus 967: }
968:
1.135 deraadt 969: /*ARGSUSED*/
1.68 markus 970: static void
971: check_parent_exists(int sig)
972: {
973: int save_errno = errno;
974:
975: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
976: /* printf("Parent has died - Authentication agent exiting.\n"); */
977: cleanup_handler(sig); /* safe */
978: }
979: signal(SIGALRM, check_parent_exists);
980: alarm(10);
981: errno = save_errno;
1.48 deraadt 982: }
983:
1.55 itojun 984: static void
1.50 itojun 985: usage(void)
1.15 markus 986: {
1.72 jakob 987: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 988: __progname);
1.72 jakob 989: fprintf(stderr, "Options:\n");
990: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
991: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
992: fprintf(stderr, " -k Kill the current agent.\n");
993: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 994: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 995: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 996: exit(1);
1.15 markus 997: }
998:
1.2 provos 999: int
1000: main(int ac, char **av)
1.1 deraadt 1001: {
1.107 markus 1002: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 1003: int sock, fd, ch;
1004: u_int nalloc;
1.96 deraadt 1005: char *shell, *format, *pidstr, *agentsocket = NULL;
1006: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1007: struct sockaddr_un sunaddr;
1.41 markus 1008: struct rlimit rlim;
1.96 deraadt 1009: extern int optind;
1.98 stevesk 1010: extern char *optarg;
1.21 markus 1011: pid_t pid;
1.96 deraadt 1012: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1013:
1014: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1015: sanitise_stdfd();
1.99 markus 1016:
1017: /* drop */
1018: setegid(getgid());
1019: setgid(getgid());
1.53 markus 1020:
1021: SSLeay_add_all_algorithms();
1.21 markus 1022:
1.106 marc 1023: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1024: switch (ch) {
1025: case 'c':
1026: if (s_flag)
1027: usage();
1028: c_flag++;
1029: break;
1030: case 'k':
1031: k_flag++;
1032: break;
1033: case 's':
1034: if (c_flag)
1035: usage();
1036: s_flag++;
1037: break;
1.57 markus 1038: case 'd':
1039: if (d_flag)
1040: usage();
1041: d_flag++;
1042: break;
1.86 markus 1043: case 'a':
1044: agentsocket = optarg;
1.106 marc 1045: break;
1046: case 't':
1047: if ((lifetime = convtime(optarg)) == -1) {
1048: fprintf(stderr, "Invalid lifetime\n");
1049: usage();
1050: }
1.86 markus 1051: break;
1.21 markus 1052: default:
1053: usage();
1054: }
1055: }
1056: ac -= optind;
1057: av += optind;
1058:
1.57 markus 1059: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1060: usage();
1061:
1.85 markus 1062: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1063: shell = getenv("SHELL");
1.136 deraadt 1064: if (shell != NULL &&
1065: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1066: c_flag = 1;
1067: }
1068: if (k_flag) {
1.136 deraadt 1069: const char *errstr = NULL;
1070:
1.21 markus 1071: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1072: if (pidstr == NULL) {
1073: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1074: SSH_AGENTPID_ENV_NAME);
1.21 markus 1075: exit(1);
1076: }
1.136 deraadt 1077: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1078: if (errstr) {
1079: fprintf(stderr,
1080: "%s=\"%s\", which is not a good PID: %s\n",
1081: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1082: exit(1);
1083: }
1084: if (kill(pid, SIGTERM) == -1) {
1085: perror("kill");
1086: exit(1);
1087: }
1088: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1089: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1090: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1091: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1092: exit(0);
1093: }
1094: parent_pid = getpid();
1095:
1.86 markus 1096: if (agentsocket == NULL) {
1097: /* Create private directory for agent socket */
1.115 markus 1098: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1099: if (mkdtemp(socket_dir) == NULL) {
1100: perror("mkdtemp: private socket dir");
1101: exit(1);
1102: }
1.91 mpech 1103: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1104: (long)parent_pid);
1.86 markus 1105: } else {
1106: /* Try to use specified agent socket */
1107: socket_dir[0] = '\0';
1108: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1109: }
1110:
1.23 markus 1111: /*
1112: * Create socket early so it will exist before command gets run from
1113: * the parent.
1114: */
1.21 markus 1115: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1116: if (sock < 0) {
1117: perror("socket");
1.121 djm 1118: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1119: cleanup_exit(1);
1120: }
1121: memset(&sunaddr, 0, sizeof(sunaddr));
1122: sunaddr.sun_family = AF_UNIX;
1123: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1124: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1125: perror("bind");
1.121 djm 1126: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1127: cleanup_exit(1);
1128: }
1.117 markus 1129: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1130: perror("listen");
1131: cleanup_exit(1);
1132: }
1.46 markus 1133:
1.23 markus 1134: /*
1135: * Fork, and have the parent execute the command, if any, or present
1136: * the socket data. The child continues as the authentication agent.
1137: */
1.57 markus 1138: if (d_flag) {
1139: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1140: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1141: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1142: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1143: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1144: goto skip;
1145: }
1.21 markus 1146: pid = fork();
1147: if (pid == -1) {
1148: perror("fork");
1.81 stevesk 1149: cleanup_exit(1);
1.21 markus 1150: }
1151: if (pid != 0) { /* Parent - execute the given command. */
1152: close(sock);
1.91 mpech 1153: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1154: if (ac == 0) {
1155: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1156: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1157: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1158: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1159: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1160: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1161: exit(0);
1162: }
1.36 deraadt 1163: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1164: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1165: perror("setenv");
1166: exit(1);
1167: }
1.21 markus 1168: execvp(av[0], av);
1169: perror(av[0]);
1170: exit(1);
1171: }
1.81 stevesk 1172: /* child */
1173: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1174:
1175: if (setsid() == -1) {
1.81 stevesk 1176: error("setsid: %s", strerror(errno));
1.67 stevesk 1177: cleanup_exit(1);
1178: }
1179:
1180: (void)chdir("/");
1.107 markus 1181: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1182: /* XXX might close listen socket */
1183: (void)dup2(fd, STDIN_FILENO);
1184: (void)dup2(fd, STDOUT_FILENO);
1185: (void)dup2(fd, STDERR_FILENO);
1186: if (fd > 2)
1187: close(fd);
1188: }
1.21 markus 1189:
1.41 markus 1190: /* deny core dumps, since memory contains unencrypted private keys */
1191: rlim.rlim_cur = rlim.rlim_max = 0;
1192: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1193: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1194: cleanup_exit(1);
1195: }
1.57 markus 1196:
1197: skip:
1.21 markus 1198: new_socket(AUTH_SOCKET, sock);
1199: if (ac > 0) {
1200: signal(SIGALRM, check_parent_exists);
1201: alarm(10);
1202: }
1.33 markus 1203: idtab_init();
1.61 markus 1204: if (!d_flag)
1.57 markus 1205: signal(SIGINT, SIG_IGN);
1.61 markus 1206: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1207: signal(SIGHUP, cleanup_handler);
1208: signal(SIGTERM, cleanup_handler);
1.66 markus 1209: nalloc = 0;
1210:
1.21 markus 1211: while (1) {
1.66 markus 1212: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1213: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1214: if (errno == EINTR)
1215: continue;
1.81 stevesk 1216: fatal("select: %s", strerror(errno));
1.21 markus 1217: }
1.46 markus 1218: after_select(readsetp, writesetp);
1.15 markus 1219: }
1.21 markus 1220: /* NOTREACHED */
1.1 deraadt 1221: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh-agent.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh