Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.144
1.144 ! stevesk 1: /* $OpenBSD: ssh-agent.c,v 1.143 2006/07/11 20:07:25 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>
1.144 ! stevesk 49: #include <unistd.h>
1.47 markus 50:
51: #include <openssl/evp.h>
52: #include <openssl/md5.h>
1.1 deraadt 53:
54: #include "ssh.h"
55: #include "rsa.h"
56: #include "buffer.h"
57: #include "bufaux.h"
58: #include "xmalloc.h"
1.32 markus 59: #include "key.h"
60: #include "authfd.h"
1.37 markus 61: #include "compat.h"
1.47 markus 62: #include "log.h"
1.107 markus 63: #include "misc.h"
1.7 deraadt 64:
1.59 markus 65: #ifdef SMARTCARD
66: #include "scard.h"
1.71 jakob 67: #endif
1.59 markus 68:
1.73 stevesk 69: typedef enum {
70: AUTH_UNUSED,
71: AUTH_SOCKET,
72: AUTH_CONNECTION
73: } sock_type;
74:
1.21 markus 75: typedef struct {
76: int fd;
1.73 stevesk 77: sock_type type;
1.21 markus 78: Buffer input;
79: Buffer output;
1.87 markus 80: Buffer request;
1.1 deraadt 81: } SocketEntry;
82:
1.45 markus 83: u_int sockets_alloc = 0;
1.1 deraadt 84: SocketEntry *sockets = NULL;
85:
1.78 provos 86: typedef struct identity {
87: TAILQ_ENTRY(identity) next;
1.33 markus 88: Key *key;
1.21 markus 89: char *comment;
1.89 markus 90: u_int death;
1.107 markus 91: u_int confirm;
1.1 deraadt 92: } Identity;
93:
1.33 markus 94: typedef struct {
95: int nentries;
1.78 provos 96: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 97: } Idtab;
98:
99: /* private key table, one per protocol version */
100: Idtab idtable[3];
1.1 deraadt 101:
102: int max_fd = 0;
103:
1.11 markus 104: /* pid of shell == parent of agent */
1.29 deraadt 105: pid_t parent_pid = -1;
1.10 markus 106:
107: /* pathname and directory for AUTH_SOCKET */
1.132 djm 108: char socket_name[MAXPATHLEN];
109: char socket_dir[MAXPATHLEN];
1.10 markus 110:
1.88 markus 111: /* locking */
112: int locked = 0;
113: char *lock_passwd = NULL;
114:
1.20 markus 115: extern char *__progname;
116:
1.106 marc 117: /* Default lifetime (0 == forever) */
118: static int lifetime = 0;
119:
1.55 itojun 120: static void
1.101 stevesk 121: close_socket(SocketEntry *e)
122: {
123: close(e->fd);
124: e->fd = -1;
125: e->type = AUTH_UNUSED;
126: buffer_free(&e->input);
127: buffer_free(&e->output);
128: buffer_free(&e->request);
129: }
130:
131: static void
1.33 markus 132: idtab_init(void)
1.1 deraadt 133: {
1.33 markus 134: int i;
1.96 deraadt 135:
1.74 deraadt 136: for (i = 0; i <=2; i++) {
1.78 provos 137: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 138: idtable[i].nentries = 0;
139: }
140: }
141:
142: /* return private key table for requested protocol version */
1.55 itojun 143: static Idtab *
1.33 markus 144: idtab_lookup(int version)
145: {
146: if (version < 1 || version > 2)
147: fatal("internal error, bad protocol version %d", version);
148: return &idtable[version];
149: }
150:
1.89 markus 151: static void
152: free_identity(Identity *id)
153: {
154: key_free(id->key);
155: xfree(id->comment);
156: xfree(id);
157: }
158:
1.33 markus 159: /* return matching private key for given public key */
1.78 provos 160: static Identity *
161: lookup_identity(Key *key, int version)
1.33 markus 162: {
1.78 provos 163: Identity *id;
164:
1.33 markus 165: Idtab *tab = idtab_lookup(version);
1.78 provos 166: TAILQ_FOREACH(id, &tab->idlist, next) {
167: if (key_equal(key, id->key))
168: return (id);
1.33 markus 169: }
1.78 provos 170: return (NULL);
171: }
172:
1.107 markus 173: /* Check confirmation of keysign request */
174: static int
175: confirm_key(Identity *id)
176: {
1.122 djm 177: char *p;
1.107 markus 178: int ret = -1;
179:
180: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 181: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
182: id->comment, p))
183: ret = 0;
1.107 markus 184: xfree(p);
1.122 djm 185:
1.107 markus 186: return (ret);
187: }
188:
1.33 markus 189: /* send list of supported public keys to 'client' */
1.55 itojun 190: static void
1.33 markus 191: process_request_identities(SocketEntry *e, int version)
192: {
193: Idtab *tab = idtab_lookup(version);
1.96 deraadt 194: Identity *id;
1.21 markus 195: Buffer msg;
1.1 deraadt 196:
1.21 markus 197: buffer_init(&msg);
1.33 markus 198: buffer_put_char(&msg, (version == 1) ?
199: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
200: buffer_put_int(&msg, tab->nentries);
1.78 provos 201: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 202: if (id->key->type == KEY_RSA1) {
1.33 markus 203: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
204: buffer_put_bignum(&msg, id->key->rsa->e);
205: buffer_put_bignum(&msg, id->key->rsa->n);
206: } else {
1.45 markus 207: u_char *blob;
208: u_int blen;
1.39 markus 209: key_to_blob(id->key, &blob, &blen);
1.33 markus 210: buffer_put_string(&msg, blob, blen);
211: xfree(blob);
212: }
213: buffer_put_cstring(&msg, id->comment);
1.21 markus 214: }
215: buffer_put_int(&e->output, buffer_len(&msg));
216: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
217: buffer_free(&msg);
1.1 deraadt 218: }
219:
1.33 markus 220: /* ssh1 only */
1.55 itojun 221: static void
1.33 markus 222: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 223: {
1.96 deraadt 224: u_char buf[32], mdbuf[16], session_id[16];
225: u_int response_type;
226: BIGNUM *challenge;
1.78 provos 227: Identity *id;
1.33 markus 228: int i, len;
1.21 markus 229: Buffer msg;
230: MD5_CTX md;
1.96 deraadt 231: Key *key;
1.21 markus 232:
233: buffer_init(&msg);
1.39 markus 234: key = key_new(KEY_RSA1);
1.76 markus 235: if ((challenge = BN_new()) == NULL)
236: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 237:
1.97 markus 238: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 239: buffer_get_bignum(&e->request, key->rsa->e);
240: buffer_get_bignum(&e->request, key->rsa->n);
241: buffer_get_bignum(&e->request, challenge);
1.21 markus 242:
1.33 markus 243: /* Only protocol 1.1 is supported */
1.87 markus 244: if (buffer_len(&e->request) == 0)
1.33 markus 245: goto failure;
1.87 markus 246: buffer_get(&e->request, session_id, 16);
247: response_type = buffer_get_int(&e->request);
1.33 markus 248: if (response_type != 1)
249: goto failure;
250:
1.78 provos 251: id = lookup_identity(key, 1);
1.107 markus 252: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 253: Key *private = id->key;
1.33 markus 254: /* Decrypt the challenge using the private key. */
1.49 markus 255: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
256: goto failure;
1.33 markus 257:
258: /* The response is MD5 of decrypted challenge plus session id. */
259: len = BN_num_bytes(challenge);
260: if (len <= 0 || len > 32) {
1.109 itojun 261: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 262: goto failure;
263: }
264: memset(buf, 0, 32);
265: BN_bn2bin(challenge, buf + 32 - len);
266: MD5_Init(&md);
267: MD5_Update(&md, buf, 32);
268: MD5_Update(&md, session_id, 16);
269: MD5_Final(mdbuf, &md);
270:
271: /* Send the response. */
272: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
273: for (i = 0; i < 16; i++)
274: buffer_put_char(&msg, mdbuf[i]);
275: goto send;
276: }
1.21 markus 277:
1.33 markus 278: failure:
279: /* Unknown identity or protocol error. Send failure. */
1.21 markus 280: buffer_put_char(&msg, SSH_AGENT_FAILURE);
281: send:
282: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 283: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
284: key_free(key);
285: BN_clear_free(challenge);
286: buffer_free(&msg);
287: }
288:
289: /* ssh2 only */
1.55 itojun 290: static void
1.33 markus 291: process_sign_request2(SocketEntry *e)
292: {
1.45 markus 293: u_char *blob, *data, *signature = NULL;
294: u_int blen, dlen, slen = 0;
1.96 deraadt 295: extern int datafellows;
296: int ok = -1, flags;
1.33 markus 297: Buffer msg;
1.96 deraadt 298: Key *key;
1.33 markus 299:
300: datafellows = 0;
1.43 markus 301:
1.87 markus 302: blob = buffer_get_string(&e->request, &blen);
303: data = buffer_get_string(&e->request, &dlen);
1.37 markus 304:
1.87 markus 305: flags = buffer_get_int(&e->request);
1.37 markus 306: if (flags & SSH_AGENT_OLD_SIGNATURE)
307: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 308:
1.39 markus 309: key = key_from_blob(blob, blen);
1.33 markus 310: if (key != NULL) {
1.78 provos 311: Identity *id = lookup_identity(key, 2);
1.107 markus 312: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 313: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 314: key_free(key);
1.33 markus 315: }
316: buffer_init(&msg);
317: if (ok == 0) {
318: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
319: buffer_put_string(&msg, signature, slen);
320: } else {
321: buffer_put_char(&msg, SSH_AGENT_FAILURE);
322: }
323: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 324: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 325: buffer_len(&msg));
1.21 markus 326: buffer_free(&msg);
1.33 markus 327: xfree(data);
328: xfree(blob);
329: if (signature != NULL)
330: xfree(signature);
1.1 deraadt 331: }
332:
1.33 markus 333: /* shared */
1.55 itojun 334: static void
1.33 markus 335: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 336: {
1.96 deraadt 337: u_int blen, bits;
338: int success = 0;
1.78 provos 339: Key *key = NULL;
1.45 markus 340: u_char *blob;
1.21 markus 341:
1.74 deraadt 342: switch (version) {
1.33 markus 343: case 1:
1.39 markus 344: key = key_new(KEY_RSA1);
1.87 markus 345: bits = buffer_get_int(&e->request);
346: buffer_get_bignum(&e->request, key->rsa->e);
347: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 348:
349: if (bits != key_size(key))
1.109 itojun 350: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 351: key_size(key), bits);
1.33 markus 352: break;
353: case 2:
1.87 markus 354: blob = buffer_get_string(&e->request, &blen);
1.39 markus 355: key = key_from_blob(blob, blen);
1.33 markus 356: xfree(blob);
357: break;
358: }
359: if (key != NULL) {
1.78 provos 360: Identity *id = lookup_identity(key, version);
361: if (id != NULL) {
1.23 markus 362: /*
363: * We have this key. Free the old key. Since we
1.124 djm 364: * don't want to leave empty slots in the middle of
1.40 markus 365: * the array, we actually free the key there and move
366: * all the entries between the empty slot and the end
367: * of the array.
1.23 markus 368: */
1.33 markus 369: Idtab *tab = idtab_lookup(version);
1.38 markus 370: if (tab->nentries < 1)
371: fatal("process_remove_identity: "
372: "internal error: tab->nentries %d",
373: tab->nentries);
1.78 provos 374: TAILQ_REMOVE(&tab->idlist, id, next);
375: free_identity(id);
1.33 markus 376: tab->nentries--;
377: success = 1;
1.21 markus 378: }
1.33 markus 379: key_free(key);
380: }
1.1 deraadt 381: buffer_put_int(&e->output, 1);
1.33 markus 382: buffer_put_char(&e->output,
383: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 384: }
385:
1.55 itojun 386: static void
1.33 markus 387: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 388: {
1.33 markus 389: Idtab *tab = idtab_lookup(version);
1.78 provos 390: Identity *id;
1.21 markus 391:
392: /* Loop over all identities and clear the keys. */
1.78 provos 393: for (id = TAILQ_FIRST(&tab->idlist); id;
394: id = TAILQ_FIRST(&tab->idlist)) {
395: TAILQ_REMOVE(&tab->idlist, id, next);
396: free_identity(id);
1.21 markus 397: }
398:
399: /* Mark that there are no identities. */
1.33 markus 400: tab->nentries = 0;
1.21 markus 401:
402: /* Send success. */
403: buffer_put_int(&e->output, 1);
404: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 405: }
406:
1.55 itojun 407: static void
1.89 markus 408: reaper(void)
409: {
1.96 deraadt 410: u_int now = time(NULL);
1.89 markus 411: Identity *id, *nxt;
412: int version;
1.96 deraadt 413: Idtab *tab;
1.89 markus 414:
415: for (version = 1; version < 3; version++) {
416: tab = idtab_lookup(version);
417: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
418: nxt = TAILQ_NEXT(id, next);
419: if (id->death != 0 && now >= id->death) {
420: TAILQ_REMOVE(&tab->idlist, id, next);
421: free_identity(id);
422: tab->nentries--;
423: }
424: }
425: }
426: }
427:
428: static void
1.33 markus 429: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 430: {
1.96 deraadt 431: Idtab *tab = idtab_lookup(version);
1.107 markus 432: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 433: char *type_name, *comment;
1.33 markus 434: Key *k = NULL;
435:
436: switch (version) {
437: case 1:
1.39 markus 438: k = key_new_private(KEY_RSA1);
1.97 markus 439: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 440: buffer_get_bignum(&e->request, k->rsa->n);
441: buffer_get_bignum(&e->request, k->rsa->e);
442: buffer_get_bignum(&e->request, k->rsa->d);
443: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 444:
445: /* SSH and SSL have p and q swapped */
1.87 markus 446: buffer_get_bignum(&e->request, k->rsa->q); /* p */
447: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 448:
449: /* Generate additional parameters */
1.60 markus 450: rsa_generate_additional_parameters(k->rsa);
1.33 markus 451: break;
452: case 2:
1.87 markus 453: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 454: type = key_type_from_name(type_name);
1.39 markus 455: xfree(type_name);
1.74 deraadt 456: switch (type) {
1.39 markus 457: case KEY_DSA:
458: k = key_new_private(type);
1.87 markus 459: buffer_get_bignum2(&e->request, k->dsa->p);
460: buffer_get_bignum2(&e->request, k->dsa->q);
461: buffer_get_bignum2(&e->request, k->dsa->g);
462: buffer_get_bignum2(&e->request, k->dsa->pub_key);
463: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 464: break;
465: case KEY_RSA:
466: k = key_new_private(type);
1.87 markus 467: buffer_get_bignum2(&e->request, k->rsa->n);
468: buffer_get_bignum2(&e->request, k->rsa->e);
469: buffer_get_bignum2(&e->request, k->rsa->d);
470: buffer_get_bignum2(&e->request, k->rsa->iqmp);
471: buffer_get_bignum2(&e->request, k->rsa->p);
472: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 473:
474: /* Generate additional parameters */
1.60 markus 475: rsa_generate_additional_parameters(k->rsa);
1.39 markus 476: break;
477: default:
1.87 markus 478: buffer_clear(&e->request);
1.108 markus 479: goto send;
480: }
481: break;
482: }
483: /* enable blinding */
484: switch (k->type) {
485: case KEY_RSA:
486: case KEY_RSA1:
487: if (RSA_blinding_on(k->rsa, NULL) != 1) {
488: error("process_add_identity: RSA_blinding_on failed");
489: key_free(k);
1.33 markus 490: goto send;
1.21 markus 491: }
1.33 markus 492: break;
493: }
1.87 markus 494: comment = buffer_get_string(&e->request, NULL);
1.33 markus 495: if (k == NULL) {
496: xfree(comment);
497: goto send;
498: }
499: success = 1;
1.94 markus 500: while (buffer_len(&e->request)) {
501: switch (buffer_get_char(&e->request)) {
502: case SSH_AGENT_CONSTRAIN_LIFETIME:
503: death = time(NULL) + buffer_get_int(&e->request);
504: break;
1.107 markus 505: case SSH_AGENT_CONSTRAIN_CONFIRM:
506: confirm = 1;
507: break;
1.94 markus 508: default:
509: break;
510: }
511: }
1.106 marc 512: if (lifetime && !death)
513: death = time(NULL) + lifetime;
1.78 provos 514: if (lookup_identity(k, version) == NULL) {
515: Identity *id = xmalloc(sizeof(Identity));
516: id->key = k;
517: id->comment = comment;
1.94 markus 518: id->death = death;
1.107 markus 519: id->confirm = confirm;
1.78 provos 520: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 521: /* Increment the number of identities. */
522: tab->nentries++;
523: } else {
524: key_free(k);
525: xfree(comment);
526: }
527: send:
1.1 deraadt 528: buffer_put_int(&e->output, 1);
1.33 markus 529: buffer_put_char(&e->output,
530: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 531: }
532:
1.88 markus 533: /* XXX todo: encrypt sensitive data with passphrase */
534: static void
535: process_lock_agent(SocketEntry *e, int lock)
536: {
1.96 deraadt 537: int success = 0;
1.88 markus 538: char *passwd;
539:
540: passwd = buffer_get_string(&e->request, NULL);
541: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
542: locked = 0;
543: memset(lock_passwd, 0, strlen(lock_passwd));
544: xfree(lock_passwd);
545: lock_passwd = NULL;
546: success = 1;
547: } else if (!locked && lock) {
548: locked = 1;
549: lock_passwd = xstrdup(passwd);
550: success = 1;
551: }
552: memset(passwd, 0, strlen(passwd));
553: xfree(passwd);
1.95 deraadt 554:
1.88 markus 555: buffer_put_int(&e->output, 1);
556: buffer_put_char(&e->output,
557: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
558: }
559:
560: static void
561: no_identities(SocketEntry *e, u_int type)
562: {
563: Buffer msg;
564:
565: buffer_init(&msg);
566: buffer_put_char(&msg,
567: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
568: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
569: buffer_put_int(&msg, 0);
570: buffer_put_int(&e->output, buffer_len(&msg));
571: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
572: buffer_free(&msg);
573: }
1.59 markus 574:
575: #ifdef SMARTCARD
576: static void
577: process_add_smartcard_key (SocketEntry *e)
578: {
1.96 deraadt 579: char *sc_reader_id = NULL, *pin;
1.110 djm 580: int i, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 581: Key **keys, *k;
1.84 markus 582: Identity *id;
1.59 markus 583: Idtab *tab;
1.75 deraadt 584:
1.87 markus 585: sc_reader_id = buffer_get_string(&e->request, NULL);
586: pin = buffer_get_string(&e->request, NULL);
1.110 djm 587:
588: while (buffer_len(&e->request)) {
589: switch (buffer_get_char(&e->request)) {
590: case SSH_AGENT_CONSTRAIN_LIFETIME:
591: death = time(NULL) + buffer_get_int(&e->request);
592: break;
593: case SSH_AGENT_CONSTRAIN_CONFIRM:
594: confirm = 1;
595: break;
596: default:
597: break;
598: }
599: }
600: if (lifetime && !death)
601: death = time(NULL) + lifetime;
602:
1.84 markus 603: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 604: xfree(sc_reader_id);
1.83 rees 605: xfree(pin);
1.59 markus 606:
1.84 markus 607: if (keys == NULL || keys[0] == NULL) {
608: error("sc_get_keys failed");
1.59 markus 609: goto send;
610: }
1.84 markus 611: for (i = 0; keys[i] != NULL; i++) {
612: k = keys[i];
613: version = k->type == KEY_RSA1 ? 1 : 2;
614: tab = idtab_lookup(version);
615: if (lookup_identity(k, version) == NULL) {
616: id = xmalloc(sizeof(Identity));
617: id->key = k;
1.111 markus 618: id->comment = sc_get_key_label(k);
1.110 djm 619: id->death = death;
620: id->confirm = confirm;
1.84 markus 621: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
622: tab->nentries++;
623: success = 1;
624: } else {
625: key_free(k);
626: }
627: keys[i] = NULL;
1.59 markus 628: }
1.84 markus 629: xfree(keys);
1.59 markus 630: send:
631: buffer_put_int(&e->output, 1);
632: buffer_put_char(&e->output,
633: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
634: }
635:
636: static void
637: process_remove_smartcard_key(SocketEntry *e)
638: {
1.96 deraadt 639: char *sc_reader_id = NULL, *pin;
640: int i, version, success = 0;
641: Key **keys, *k = NULL;
1.84 markus 642: Identity *id;
643: Idtab *tab;
1.59 markus 644:
1.87 markus 645: sc_reader_id = buffer_get_string(&e->request, NULL);
646: pin = buffer_get_string(&e->request, NULL);
1.84 markus 647: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 648: xfree(sc_reader_id);
1.83 rees 649: xfree(pin);
1.59 markus 650:
1.84 markus 651: if (keys == NULL || keys[0] == NULL) {
652: error("sc_get_keys failed");
653: goto send;
654: }
655: for (i = 0; keys[i] != NULL; i++) {
656: k = keys[i];
657: version = k->type == KEY_RSA1 ? 1 : 2;
658: if ((id = lookup_identity(k, version)) != NULL) {
659: tab = idtab_lookup(version);
1.90 markus 660: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 661: tab->nentries--;
1.78 provos 662: free_identity(id);
1.59 markus 663: success = 1;
664: }
665: key_free(k);
1.84 markus 666: keys[i] = NULL;
1.59 markus 667: }
1.84 markus 668: xfree(keys);
669: send:
1.59 markus 670: buffer_put_int(&e->output, 1);
671: buffer_put_char(&e->output,
672: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
673: }
1.70 jakob 674: #endif /* SMARTCARD */
1.59 markus 675:
1.33 markus 676: /* dispatch incoming messages */
677:
1.55 itojun 678: static void
1.2 provos 679: process_message(SocketEntry *e)
1.1 deraadt 680: {
1.96 deraadt 681: u_int msg_len, type;
1.45 markus 682: u_char *cp;
1.89 markus 683:
684: /* kill dead keys */
685: reaper();
686:
1.21 markus 687: if (buffer_len(&e->input) < 5)
688: return; /* Incomplete message. */
1.77 stevesk 689: cp = buffer_ptr(&e->input);
1.137 djm 690: msg_len = get_u32(cp);
1.21 markus 691: if (msg_len > 256 * 1024) {
1.101 stevesk 692: close_socket(e);
1.21 markus 693: return;
694: }
695: if (buffer_len(&e->input) < msg_len + 4)
696: return;
1.87 markus 697:
698: /* move the current input to e->request */
1.21 markus 699: buffer_consume(&e->input, 4);
1.87 markus 700: buffer_clear(&e->request);
701: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
702: buffer_consume(&e->input, msg_len);
703: type = buffer_get_char(&e->request);
1.21 markus 704:
1.88 markus 705: /* check wheter agent is locked */
706: if (locked && type != SSH_AGENTC_UNLOCK) {
707: buffer_clear(&e->request);
708: switch (type) {
709: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
710: case SSH2_AGENTC_REQUEST_IDENTITIES:
711: /* send empty lists */
712: no_identities(e, type);
713: break;
714: default:
715: /* send a fail message for all other request types */
716: buffer_put_int(&e->output, 1);
717: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
718: }
719: return;
720: }
721:
1.59 markus 722: debug("type %d", type);
1.21 markus 723: switch (type) {
1.88 markus 724: case SSH_AGENTC_LOCK:
725: case SSH_AGENTC_UNLOCK:
726: process_lock_agent(e, type == SSH_AGENTC_LOCK);
727: break;
1.33 markus 728: /* ssh1 */
729: case SSH_AGENTC_RSA_CHALLENGE:
730: process_authentication_challenge1(e);
731: break;
1.21 markus 732: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 733: process_request_identities(e, 1);
1.21 markus 734: break;
735: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 736: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 737: process_add_identity(e, 1);
1.21 markus 738: break;
739: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 740: process_remove_identity(e, 1);
1.21 markus 741: break;
742: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 743: process_remove_all_identities(e, 1);
744: break;
745: /* ssh2 */
746: case SSH2_AGENTC_SIGN_REQUEST:
747: process_sign_request2(e);
748: break;
749: case SSH2_AGENTC_REQUEST_IDENTITIES:
750: process_request_identities(e, 2);
751: break;
752: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 753: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 754: process_add_identity(e, 2);
755: break;
756: case SSH2_AGENTC_REMOVE_IDENTITY:
757: process_remove_identity(e, 2);
758: break;
759: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
760: process_remove_all_identities(e, 2);
1.21 markus 761: break;
1.59 markus 762: #ifdef SMARTCARD
763: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 764: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 765: process_add_smartcard_key(e);
1.75 deraadt 766: break;
1.59 markus 767: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
768: process_remove_smartcard_key(e);
1.75 deraadt 769: break;
1.70 jakob 770: #endif /* SMARTCARD */
1.21 markus 771: default:
772: /* Unknown message. Respond with failure. */
773: error("Unknown message %d", type);
1.87 markus 774: buffer_clear(&e->request);
1.21 markus 775: buffer_put_int(&e->output, 1);
776: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
777: break;
778: }
1.1 deraadt 779: }
780:
1.55 itojun 781: static void
1.73 stevesk 782: new_socket(sock_type type, int fd)
1.1 deraadt 783: {
1.112 markus 784: u_int i, old_alloc, new_alloc;
1.96 deraadt 785:
1.119 djm 786: set_nonblock(fd);
1.21 markus 787:
788: if (fd > max_fd)
789: max_fd = fd;
790:
791: for (i = 0; i < sockets_alloc; i++)
792: if (sockets[i].type == AUTH_UNUSED) {
793: sockets[i].fd = fd;
794: buffer_init(&sockets[i].input);
795: buffer_init(&sockets[i].output);
1.87 markus 796: buffer_init(&sockets[i].request);
1.112 markus 797: sockets[i].type = type;
1.21 markus 798: return;
799: }
800: old_alloc = sockets_alloc;
1.112 markus 801: new_alloc = sockets_alloc + 10;
1.133 djm 802: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 803: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 804: sockets[i].type = AUTH_UNUSED;
1.112 markus 805: sockets_alloc = new_alloc;
1.21 markus 806: sockets[old_alloc].fd = fd;
807: buffer_init(&sockets[old_alloc].input);
808: buffer_init(&sockets[old_alloc].output);
1.87 markus 809: buffer_init(&sockets[old_alloc].request);
1.112 markus 810: sockets[old_alloc].type = type;
1.1 deraadt 811: }
812:
1.55 itojun 813: static int
1.120 avsm 814: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp)
1.1 deraadt 815: {
1.46 markus 816: u_int i, sz;
817: int n = 0;
818:
819: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 820: switch (sockets[i].type) {
821: case AUTH_SOCKET:
822: case AUTH_CONNECTION:
1.46 markus 823: n = MAX(n, sockets[i].fd);
1.21 markus 824: break;
825: case AUTH_UNUSED:
826: break;
827: default:
828: fatal("Unknown socket type %d", sockets[i].type);
829: break;
830: }
1.46 markus 831: }
832:
833: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 834: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 835: if (*fdrp)
1.54 stevesk 836: xfree(*fdrp);
1.46 markus 837: if (*fdwp)
1.54 stevesk 838: xfree(*fdwp);
1.46 markus 839: *fdrp = xmalloc(sz);
840: *fdwp = xmalloc(sz);
1.66 markus 841: *nallocp = sz;
1.46 markus 842: }
1.66 markus 843: if (n < *fdl)
844: debug("XXX shrink: %d < %d", n, *fdl);
845: *fdl = n;
1.46 markus 846: memset(*fdrp, 0, sz);
847: memset(*fdwp, 0, sz);
848:
849: for (i = 0; i < sockets_alloc; i++) {
850: switch (sockets[i].type) {
851: case AUTH_SOCKET:
852: case AUTH_CONNECTION:
853: FD_SET(sockets[i].fd, *fdrp);
854: if (buffer_len(&sockets[i].output) > 0)
855: FD_SET(sockets[i].fd, *fdwp);
856: break;
857: default:
858: break;
859: }
860: }
861: return (1);
1.21 markus 862: }
863:
1.55 itojun 864: static void
1.21 markus 865: after_select(fd_set *readset, fd_set *writeset)
866: {
1.96 deraadt 867: struct sockaddr_un sunaddr;
1.26 markus 868: socklen_t slen;
1.21 markus 869: char buf[1024];
1.96 deraadt 870: int len, sock;
871: u_int i;
1.103 markus 872: uid_t euid;
873: gid_t egid;
1.21 markus 874:
875: for (i = 0; i < sockets_alloc; i++)
876: switch (sockets[i].type) {
877: case AUTH_UNUSED:
878: break;
879: case AUTH_SOCKET:
880: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 881: slen = sizeof(sunaddr);
1.46 markus 882: sock = accept(sockets[i].fd,
1.131 deraadt 883: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 884: if (sock < 0) {
1.81 stevesk 885: error("accept from AUTH_SOCKET: %s",
886: strerror(errno));
1.103 markus 887: break;
888: }
889: if (getpeereid(sock, &euid, &egid) < 0) {
890: error("getpeereid %d failed: %s",
891: sock, strerror(errno));
892: close(sock);
893: break;
894: }
1.105 markus 895: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 896: error("uid mismatch: "
1.104 stevesk 897: "peer euid %u != uid %u",
898: (u_int) euid, (u_int) getuid());
1.103 markus 899: close(sock);
1.21 markus 900: break;
901: }
902: new_socket(AUTH_CONNECTION, sock);
903: }
904: break;
905: case AUTH_CONNECTION:
906: if (buffer_len(&sockets[i].output) > 0 &&
907: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 908: do {
909: len = write(sockets[i].fd,
910: buffer_ptr(&sockets[i].output),
911: buffer_len(&sockets[i].output));
912: if (len == -1 && (errno == EAGAIN ||
913: errno == EINTR))
914: continue;
915: break;
916: } while (1);
1.21 markus 917: if (len <= 0) {
1.101 stevesk 918: close_socket(&sockets[i]);
1.21 markus 919: break;
920: }
921: buffer_consume(&sockets[i].output, len);
922: }
923: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 924: do {
925: len = read(sockets[i].fd, buf, sizeof(buf));
926: if (len == -1 && (errno == EAGAIN ||
927: errno == EINTR))
928: continue;
929: break;
930: } while (1);
1.21 markus 931: if (len <= 0) {
1.101 stevesk 932: close_socket(&sockets[i]);
1.21 markus 933: break;
934: }
935: buffer_append(&sockets[i].input, buf, len);
936: process_message(&sockets[i]);
937: }
938: break;
939: default:
940: fatal("Unknown type %d", sockets[i].type);
941: }
1.1 deraadt 942: }
943:
1.55 itojun 944: static void
1.113 markus 945: cleanup_socket(void)
1.15 markus 946: {
1.48 deraadt 947: if (socket_name[0])
948: unlink(socket_name);
949: if (socket_dir[0])
950: rmdir(socket_dir);
1.10 markus 951: }
952:
1.114 markus 953: void
1.15 markus 954: cleanup_exit(int i)
955: {
1.113 markus 956: cleanup_socket();
957: _exit(i);
1.15 markus 958: }
959:
1.135 deraadt 960: /*ARGSUSED*/
1.55 itojun 961: static void
1.48 deraadt 962: cleanup_handler(int sig)
963: {
1.113 markus 964: cleanup_socket();
1.48 deraadt 965: _exit(2);
1.113 markus 966: }
967:
1.135 deraadt 968: /*ARGSUSED*/
1.68 markus 969: static void
970: check_parent_exists(int sig)
971: {
972: int save_errno = errno;
973:
974: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
975: /* printf("Parent has died - Authentication agent exiting.\n"); */
976: cleanup_handler(sig); /* safe */
977: }
978: signal(SIGALRM, check_parent_exists);
979: alarm(10);
980: errno = save_errno;
1.48 deraadt 981: }
982:
1.55 itojun 983: static void
1.50 itojun 984: usage(void)
1.15 markus 985: {
1.72 jakob 986: fprintf(stderr, "Usage: %s [options] [command [args ...]]\n",
1.46 markus 987: __progname);
1.72 jakob 988: fprintf(stderr, "Options:\n");
989: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
990: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
991: fprintf(stderr, " -k Kill the current agent.\n");
992: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 993: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 994: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 995: exit(1);
1.15 markus 996: }
997:
1.2 provos 998: int
999: main(int ac, char **av)
1.1 deraadt 1000: {
1.107 markus 1001: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.120 avsm 1002: int sock, fd, ch;
1003: u_int nalloc;
1.96 deraadt 1004: char *shell, *format, *pidstr, *agentsocket = NULL;
1005: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1006: struct sockaddr_un sunaddr;
1.41 markus 1007: struct rlimit rlim;
1.96 deraadt 1008: extern int optind;
1.98 stevesk 1009: extern char *optarg;
1.21 markus 1010: pid_t pid;
1.96 deraadt 1011: char pidstrbuf[1 + 3 * sizeof pid];
1.123 djm 1012:
1013: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1014: sanitise_stdfd();
1.99 markus 1015:
1016: /* drop */
1017: setegid(getgid());
1018: setgid(getgid());
1.53 markus 1019:
1020: SSLeay_add_all_algorithms();
1.21 markus 1021:
1.106 marc 1022: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1023: switch (ch) {
1024: case 'c':
1025: if (s_flag)
1026: usage();
1027: c_flag++;
1028: break;
1029: case 'k':
1030: k_flag++;
1031: break;
1032: case 's':
1033: if (c_flag)
1034: usage();
1035: s_flag++;
1036: break;
1.57 markus 1037: case 'd':
1038: if (d_flag)
1039: usage();
1040: d_flag++;
1041: break;
1.86 markus 1042: case 'a':
1043: agentsocket = optarg;
1.106 marc 1044: break;
1045: case 't':
1046: if ((lifetime = convtime(optarg)) == -1) {
1047: fprintf(stderr, "Invalid lifetime\n");
1048: usage();
1049: }
1.86 markus 1050: break;
1.21 markus 1051: default:
1052: usage();
1053: }
1054: }
1055: ac -= optind;
1056: av += optind;
1057:
1.57 markus 1058: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1059: usage();
1060:
1.85 markus 1061: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1062: shell = getenv("SHELL");
1.136 deraadt 1063: if (shell != NULL &&
1064: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1065: c_flag = 1;
1066: }
1067: if (k_flag) {
1.136 deraadt 1068: const char *errstr = NULL;
1069:
1.21 markus 1070: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1071: if (pidstr == NULL) {
1072: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1073: SSH_AGENTPID_ENV_NAME);
1.21 markus 1074: exit(1);
1075: }
1.136 deraadt 1076: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1077: if (errstr) {
1078: fprintf(stderr,
1079: "%s=\"%s\", which is not a good PID: %s\n",
1080: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1081: exit(1);
1082: }
1083: if (kill(pid, SIGTERM) == -1) {
1084: perror("kill");
1085: exit(1);
1086: }
1087: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1088: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1089: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1090: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1091: exit(0);
1092: }
1093: parent_pid = getpid();
1094:
1.86 markus 1095: if (agentsocket == NULL) {
1096: /* Create private directory for agent socket */
1.115 markus 1097: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1098: if (mkdtemp(socket_dir) == NULL) {
1099: perror("mkdtemp: private socket dir");
1100: exit(1);
1101: }
1.91 mpech 1102: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1103: (long)parent_pid);
1.86 markus 1104: } else {
1105: /* Try to use specified agent socket */
1106: socket_dir[0] = '\0';
1107: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1108: }
1109:
1.23 markus 1110: /*
1111: * Create socket early so it will exist before command gets run from
1112: * the parent.
1113: */
1.21 markus 1114: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1115: if (sock < 0) {
1116: perror("socket");
1.121 djm 1117: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1118: cleanup_exit(1);
1119: }
1120: memset(&sunaddr, 0, sizeof(sunaddr));
1121: sunaddr.sun_family = AF_UNIX;
1122: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1123: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1124: perror("bind");
1.121 djm 1125: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1126: cleanup_exit(1);
1127: }
1.117 markus 1128: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1129: perror("listen");
1130: cleanup_exit(1);
1131: }
1.46 markus 1132:
1.23 markus 1133: /*
1134: * Fork, and have the parent execute the command, if any, or present
1135: * the socket data. The child continues as the authentication agent.
1136: */
1.57 markus 1137: if (d_flag) {
1138: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1139: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1140: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1141: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1142: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1143: goto skip;
1144: }
1.21 markus 1145: pid = fork();
1146: if (pid == -1) {
1147: perror("fork");
1.81 stevesk 1148: cleanup_exit(1);
1.21 markus 1149: }
1150: if (pid != 0) { /* Parent - execute the given command. */
1151: close(sock);
1.91 mpech 1152: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1153: if (ac == 0) {
1154: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1155: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1156: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1157: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1158: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1159: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1160: exit(0);
1161: }
1.36 deraadt 1162: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1163: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1164: perror("setenv");
1165: exit(1);
1166: }
1.21 markus 1167: execvp(av[0], av);
1168: perror(av[0]);
1169: exit(1);
1170: }
1.81 stevesk 1171: /* child */
1172: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1173:
1174: if (setsid() == -1) {
1.81 stevesk 1175: error("setsid: %s", strerror(errno));
1.67 stevesk 1176: cleanup_exit(1);
1177: }
1178:
1179: (void)chdir("/");
1.107 markus 1180: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1181: /* XXX might close listen socket */
1182: (void)dup2(fd, STDIN_FILENO);
1183: (void)dup2(fd, STDOUT_FILENO);
1184: (void)dup2(fd, STDERR_FILENO);
1185: if (fd > 2)
1186: close(fd);
1187: }
1.21 markus 1188:
1.41 markus 1189: /* deny core dumps, since memory contains unencrypted private keys */
1190: rlim.rlim_cur = rlim.rlim_max = 0;
1191: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1192: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1193: cleanup_exit(1);
1194: }
1.57 markus 1195:
1196: skip:
1.21 markus 1197: new_socket(AUTH_SOCKET, sock);
1198: if (ac > 0) {
1199: signal(SIGALRM, check_parent_exists);
1200: alarm(10);
1201: }
1.33 markus 1202: idtab_init();
1.61 markus 1203: if (!d_flag)
1.57 markus 1204: signal(SIGINT, SIG_IGN);
1.61 markus 1205: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1206: signal(SIGHUP, cleanup_handler);
1207: signal(SIGTERM, cleanup_handler);
1.66 markus 1208: nalloc = 0;
1209:
1.21 markus 1210: while (1) {
1.66 markus 1211: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc);
1.46 markus 1212: if (select(max_fd + 1, readsetp, writesetp, NULL, NULL) < 0) {
1.21 markus 1213: if (errno == EINTR)
1214: continue;
1.81 stevesk 1215: fatal("select: %s", strerror(errno));
1.21 markus 1216: }
1.46 markus 1217: after_select(readsetp, writesetp);
1.15 markus 1218: }
1.21 markus 1219: /* NOTREACHED */
1.1 deraadt 1220: }
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