Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.158
1.158 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.157 2007/09/25 23:48:57 canacar 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>
1.128 stevesk 41: #include <sys/types.h>
1.141 stevesk 42: #include <sys/socket.h>
1.128 stevesk 43: #include <sys/un.h>
1.148 stevesk 44: #include <sys/param.h>
1.126 stevesk 45:
1.146 stevesk 46: #include <openssl/evp.h>
47: #include <openssl/md5.h>
48:
1.143 stevesk 49: #include <errno.h>
1.142 stevesk 50: #include <fcntl.h>
1.126 stevesk 51: #include <paths.h>
1.129 stevesk 52: #include <signal.h>
1.149 stevesk 53: #include <stdlib.h>
1.150 stevesk 54: #include <stdio.h>
1.146 stevesk 55: #include <string.h>
1.145 stevesk 56: #include <time.h>
1.144 stevesk 57: #include <unistd.h>
1.1 deraadt 58:
1.151 deraadt 59: #include "xmalloc.h"
1.1 deraadt 60: #include "ssh.h"
61: #include "rsa.h"
62: #include "buffer.h"
1.32 markus 63: #include "key.h"
64: #include "authfd.h"
1.37 markus 65: #include "compat.h"
1.47 markus 66: #include "log.h"
1.107 markus 67: #include "misc.h"
1.7 deraadt 68:
1.59 markus 69: #ifdef SMARTCARD
70: #include "scard.h"
1.71 jakob 71: #endif
1.59 markus 72:
1.73 stevesk 73: typedef enum {
74: AUTH_UNUSED,
75: AUTH_SOCKET,
76: AUTH_CONNECTION
77: } sock_type;
78:
1.21 markus 79: typedef struct {
80: int fd;
1.73 stevesk 81: sock_type type;
1.21 markus 82: Buffer input;
83: Buffer output;
1.87 markus 84: Buffer request;
1.1 deraadt 85: } SocketEntry;
86:
1.45 markus 87: u_int sockets_alloc = 0;
1.1 deraadt 88: SocketEntry *sockets = NULL;
89:
1.78 provos 90: typedef struct identity {
91: TAILQ_ENTRY(identity) next;
1.33 markus 92: Key *key;
1.21 markus 93: char *comment;
1.89 markus 94: u_int death;
1.107 markus 95: u_int confirm;
1.1 deraadt 96: } Identity;
97:
1.33 markus 98: typedef struct {
99: int nentries;
1.78 provos 100: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 101: } Idtab;
102:
103: /* private key table, one per protocol version */
104: Idtab idtable[3];
1.1 deraadt 105:
106: int max_fd = 0;
107:
1.11 markus 108: /* pid of shell == parent of agent */
1.29 deraadt 109: pid_t parent_pid = -1;
1.155 dtucker 110: u_int parent_alive_interval = 0;
1.10 markus 111:
112: /* pathname and directory for AUTH_SOCKET */
1.132 djm 113: char socket_name[MAXPATHLEN];
114: char socket_dir[MAXPATHLEN];
1.10 markus 115:
1.88 markus 116: /* locking */
117: int locked = 0;
118: char *lock_passwd = NULL;
119:
1.20 markus 120: extern char *__progname;
121:
1.106 marc 122: /* Default lifetime (0 == forever) */
123: static int lifetime = 0;
124:
1.55 itojun 125: static void
1.101 stevesk 126: close_socket(SocketEntry *e)
127: {
128: close(e->fd);
129: e->fd = -1;
130: e->type = AUTH_UNUSED;
131: buffer_free(&e->input);
132: buffer_free(&e->output);
133: buffer_free(&e->request);
134: }
135:
136: static void
1.33 markus 137: idtab_init(void)
1.1 deraadt 138: {
1.33 markus 139: int i;
1.96 deraadt 140:
1.74 deraadt 141: for (i = 0; i <=2; i++) {
1.78 provos 142: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 143: idtable[i].nentries = 0;
144: }
145: }
146:
147: /* return private key table for requested protocol version */
1.55 itojun 148: static Idtab *
1.33 markus 149: idtab_lookup(int version)
150: {
151: if (version < 1 || version > 2)
152: fatal("internal error, bad protocol version %d", version);
153: return &idtable[version];
154: }
155:
1.89 markus 156: static void
157: free_identity(Identity *id)
158: {
159: key_free(id->key);
160: xfree(id->comment);
161: xfree(id);
162: }
163:
1.33 markus 164: /* return matching private key for given public key */
1.78 provos 165: static Identity *
166: lookup_identity(Key *key, int version)
1.33 markus 167: {
1.78 provos 168: Identity *id;
169:
1.33 markus 170: Idtab *tab = idtab_lookup(version);
1.78 provos 171: TAILQ_FOREACH(id, &tab->idlist, next) {
172: if (key_equal(key, id->key))
173: return (id);
1.33 markus 174: }
1.78 provos 175: return (NULL);
176: }
177:
1.107 markus 178: /* Check confirmation of keysign request */
179: static int
180: confirm_key(Identity *id)
181: {
1.122 djm 182: char *p;
1.107 markus 183: int ret = -1;
184:
185: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 186: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
187: id->comment, p))
188: ret = 0;
1.107 markus 189: xfree(p);
1.122 djm 190:
1.107 markus 191: return (ret);
192: }
193:
1.33 markus 194: /* send list of supported public keys to 'client' */
1.55 itojun 195: static void
1.33 markus 196: process_request_identities(SocketEntry *e, int version)
197: {
198: Idtab *tab = idtab_lookup(version);
1.96 deraadt 199: Identity *id;
1.21 markus 200: Buffer msg;
1.1 deraadt 201:
1.21 markus 202: buffer_init(&msg);
1.33 markus 203: buffer_put_char(&msg, (version == 1) ?
204: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
205: buffer_put_int(&msg, tab->nentries);
1.78 provos 206: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 207: if (id->key->type == KEY_RSA1) {
1.33 markus 208: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
209: buffer_put_bignum(&msg, id->key->rsa->e);
210: buffer_put_bignum(&msg, id->key->rsa->n);
211: } else {
1.45 markus 212: u_char *blob;
213: u_int blen;
1.39 markus 214: key_to_blob(id->key, &blob, &blen);
1.33 markus 215: buffer_put_string(&msg, blob, blen);
216: xfree(blob);
217: }
218: buffer_put_cstring(&msg, id->comment);
1.21 markus 219: }
220: buffer_put_int(&e->output, buffer_len(&msg));
221: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
222: buffer_free(&msg);
1.1 deraadt 223: }
224:
1.33 markus 225: /* ssh1 only */
1.55 itojun 226: static void
1.33 markus 227: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 228: {
1.96 deraadt 229: u_char buf[32], mdbuf[16], session_id[16];
230: u_int response_type;
231: BIGNUM *challenge;
1.78 provos 232: Identity *id;
1.33 markus 233: int i, len;
1.21 markus 234: Buffer msg;
235: MD5_CTX md;
1.96 deraadt 236: Key *key;
1.21 markus 237:
238: buffer_init(&msg);
1.39 markus 239: key = key_new(KEY_RSA1);
1.76 markus 240: if ((challenge = BN_new()) == NULL)
241: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 242:
1.97 markus 243: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 244: buffer_get_bignum(&e->request, key->rsa->e);
245: buffer_get_bignum(&e->request, key->rsa->n);
246: buffer_get_bignum(&e->request, challenge);
1.21 markus 247:
1.33 markus 248: /* Only protocol 1.1 is supported */
1.87 markus 249: if (buffer_len(&e->request) == 0)
1.33 markus 250: goto failure;
1.87 markus 251: buffer_get(&e->request, session_id, 16);
252: response_type = buffer_get_int(&e->request);
1.33 markus 253: if (response_type != 1)
254: goto failure;
255:
1.78 provos 256: id = lookup_identity(key, 1);
1.107 markus 257: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 258: Key *private = id->key;
1.33 markus 259: /* Decrypt the challenge using the private key. */
1.49 markus 260: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
261: goto failure;
1.33 markus 262:
263: /* The response is MD5 of decrypted challenge plus session id. */
264: len = BN_num_bytes(challenge);
265: if (len <= 0 || len > 32) {
1.109 itojun 266: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 267: goto failure;
268: }
269: memset(buf, 0, 32);
270: BN_bn2bin(challenge, buf + 32 - len);
271: MD5_Init(&md);
272: MD5_Update(&md, buf, 32);
273: MD5_Update(&md, session_id, 16);
274: MD5_Final(mdbuf, &md);
275:
276: /* Send the response. */
277: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
278: for (i = 0; i < 16; i++)
279: buffer_put_char(&msg, mdbuf[i]);
280: goto send;
281: }
1.21 markus 282:
1.33 markus 283: failure:
284: /* Unknown identity or protocol error. Send failure. */
1.21 markus 285: buffer_put_char(&msg, SSH_AGENT_FAILURE);
286: send:
287: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 288: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
289: key_free(key);
290: BN_clear_free(challenge);
291: buffer_free(&msg);
292: }
293:
294: /* ssh2 only */
1.55 itojun 295: static void
1.33 markus 296: process_sign_request2(SocketEntry *e)
297: {
1.45 markus 298: u_char *blob, *data, *signature = NULL;
299: u_int blen, dlen, slen = 0;
1.96 deraadt 300: extern int datafellows;
301: int ok = -1, flags;
1.33 markus 302: Buffer msg;
1.96 deraadt 303: Key *key;
1.33 markus 304:
305: datafellows = 0;
1.43 markus 306:
1.87 markus 307: blob = buffer_get_string(&e->request, &blen);
308: data = buffer_get_string(&e->request, &dlen);
1.37 markus 309:
1.87 markus 310: flags = buffer_get_int(&e->request);
1.37 markus 311: if (flags & SSH_AGENT_OLD_SIGNATURE)
312: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 313:
1.39 markus 314: key = key_from_blob(blob, blen);
1.33 markus 315: if (key != NULL) {
1.78 provos 316: Identity *id = lookup_identity(key, 2);
1.107 markus 317: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 318: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 319: key_free(key);
1.33 markus 320: }
321: buffer_init(&msg);
322: if (ok == 0) {
323: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
324: buffer_put_string(&msg, signature, slen);
325: } else {
326: buffer_put_char(&msg, SSH_AGENT_FAILURE);
327: }
328: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 329: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 330: buffer_len(&msg));
1.21 markus 331: buffer_free(&msg);
1.33 markus 332: xfree(data);
333: xfree(blob);
334: if (signature != NULL)
335: xfree(signature);
1.1 deraadt 336: }
337:
1.33 markus 338: /* shared */
1.55 itojun 339: static void
1.33 markus 340: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 341: {
1.96 deraadt 342: u_int blen, bits;
343: int success = 0;
1.78 provos 344: Key *key = NULL;
1.45 markus 345: u_char *blob;
1.21 markus 346:
1.74 deraadt 347: switch (version) {
1.33 markus 348: case 1:
1.39 markus 349: key = key_new(KEY_RSA1);
1.87 markus 350: bits = buffer_get_int(&e->request);
351: buffer_get_bignum(&e->request, key->rsa->e);
352: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 353:
354: if (bits != key_size(key))
1.109 itojun 355: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 356: key_size(key), bits);
1.33 markus 357: break;
358: case 2:
1.87 markus 359: blob = buffer_get_string(&e->request, &blen);
1.39 markus 360: key = key_from_blob(blob, blen);
1.33 markus 361: xfree(blob);
362: break;
363: }
364: if (key != NULL) {
1.78 provos 365: Identity *id = lookup_identity(key, version);
366: if (id != NULL) {
1.23 markus 367: /*
368: * We have this key. Free the old key. Since we
1.124 djm 369: * don't want to leave empty slots in the middle of
1.40 markus 370: * the array, we actually free the key there and move
371: * all the entries between the empty slot and the end
372: * of the array.
1.23 markus 373: */
1.33 markus 374: Idtab *tab = idtab_lookup(version);
1.38 markus 375: if (tab->nentries < 1)
376: fatal("process_remove_identity: "
377: "internal error: tab->nentries %d",
378: tab->nentries);
1.78 provos 379: TAILQ_REMOVE(&tab->idlist, id, next);
380: free_identity(id);
1.33 markus 381: tab->nentries--;
382: success = 1;
1.21 markus 383: }
1.33 markus 384: key_free(key);
385: }
1.1 deraadt 386: buffer_put_int(&e->output, 1);
1.33 markus 387: buffer_put_char(&e->output,
388: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 389: }
390:
1.55 itojun 391: static void
1.33 markus 392: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 393: {
1.33 markus 394: Idtab *tab = idtab_lookup(version);
1.78 provos 395: Identity *id;
1.21 markus 396:
397: /* Loop over all identities and clear the keys. */
1.78 provos 398: for (id = TAILQ_FIRST(&tab->idlist); id;
399: id = TAILQ_FIRST(&tab->idlist)) {
400: TAILQ_REMOVE(&tab->idlist, id, next);
401: free_identity(id);
1.21 markus 402: }
403:
404: /* Mark that there are no identities. */
1.33 markus 405: tab->nentries = 0;
1.21 markus 406:
407: /* Send success. */
408: buffer_put_int(&e->output, 1);
409: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 410: }
411:
1.155 dtucker 412: /* removes expired keys and returns number of seconds until the next expiry */
413: static u_int
1.89 markus 414: reaper(void)
415: {
1.155 dtucker 416: u_int deadline = 0, now = time(NULL);
1.89 markus 417: Identity *id, *nxt;
418: int version;
1.96 deraadt 419: Idtab *tab;
1.89 markus 420:
421: for (version = 1; version < 3; version++) {
422: tab = idtab_lookup(version);
423: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
424: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 425: if (id->death == 0)
426: continue;
427: if (now >= id->death) {
1.154 dtucker 428: debug("expiring key '%s'", id->comment);
1.89 markus 429: TAILQ_REMOVE(&tab->idlist, id, next);
430: free_identity(id);
431: tab->nentries--;
1.155 dtucker 432: } else
433: deadline = (deadline == 0) ? id->death :
434: MIN(deadline, id->death);
1.89 markus 435: }
436: }
1.155 dtucker 437: if (deadline == 0 || deadline <= now)
438: return 0;
439: else
440: return (deadline - now);
1.89 markus 441: }
442:
443: static void
1.33 markus 444: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 445: {
1.96 deraadt 446: Idtab *tab = idtab_lookup(version);
1.157 canacar 447: Identity *id;
1.107 markus 448: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 449: char *type_name, *comment;
1.33 markus 450: Key *k = NULL;
451:
452: switch (version) {
453: case 1:
1.39 markus 454: k = key_new_private(KEY_RSA1);
1.97 markus 455: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 456: buffer_get_bignum(&e->request, k->rsa->n);
457: buffer_get_bignum(&e->request, k->rsa->e);
458: buffer_get_bignum(&e->request, k->rsa->d);
459: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 460:
461: /* SSH and SSL have p and q swapped */
1.87 markus 462: buffer_get_bignum(&e->request, k->rsa->q); /* p */
463: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 464:
465: /* Generate additional parameters */
1.60 markus 466: rsa_generate_additional_parameters(k->rsa);
1.33 markus 467: break;
468: case 2:
1.87 markus 469: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 470: type = key_type_from_name(type_name);
1.39 markus 471: xfree(type_name);
1.74 deraadt 472: switch (type) {
1.39 markus 473: case KEY_DSA:
474: k = key_new_private(type);
1.87 markus 475: buffer_get_bignum2(&e->request, k->dsa->p);
476: buffer_get_bignum2(&e->request, k->dsa->q);
477: buffer_get_bignum2(&e->request, k->dsa->g);
478: buffer_get_bignum2(&e->request, k->dsa->pub_key);
479: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 480: break;
481: case KEY_RSA:
482: k = key_new_private(type);
1.87 markus 483: buffer_get_bignum2(&e->request, k->rsa->n);
484: buffer_get_bignum2(&e->request, k->rsa->e);
485: buffer_get_bignum2(&e->request, k->rsa->d);
486: buffer_get_bignum2(&e->request, k->rsa->iqmp);
487: buffer_get_bignum2(&e->request, k->rsa->p);
488: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 489:
490: /* Generate additional parameters */
1.60 markus 491: rsa_generate_additional_parameters(k->rsa);
1.39 markus 492: break;
493: default:
1.87 markus 494: buffer_clear(&e->request);
1.108 markus 495: goto send;
496: }
497: break;
498: }
499: /* enable blinding */
500: switch (k->type) {
501: case KEY_RSA:
502: case KEY_RSA1:
503: if (RSA_blinding_on(k->rsa, NULL) != 1) {
504: error("process_add_identity: RSA_blinding_on failed");
505: key_free(k);
1.33 markus 506: goto send;
1.21 markus 507: }
1.33 markus 508: break;
509: }
1.87 markus 510: comment = buffer_get_string(&e->request, NULL);
1.33 markus 511: if (k == NULL) {
512: xfree(comment);
513: goto send;
514: }
1.94 markus 515: while (buffer_len(&e->request)) {
1.158 ! djm 516: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 517: case SSH_AGENT_CONSTRAIN_LIFETIME:
518: death = time(NULL) + buffer_get_int(&e->request);
519: break;
1.107 markus 520: case SSH_AGENT_CONSTRAIN_CONFIRM:
521: confirm = 1;
522: break;
1.94 markus 523: default:
1.158 ! djm 524: error("process_add_identity: "
! 525: "Unknown constraint type %d", type);
! 526: xfree(comment);
! 527: key_free(k);
! 528: goto send;
1.94 markus 529: }
530: }
1.158 ! djm 531: success = 1;
1.106 marc 532: if (lifetime && !death)
533: death = time(NULL) + lifetime;
1.157 canacar 534: if ((id = lookup_identity(k, version)) == NULL) {
535: id = xmalloc(sizeof(Identity));
1.78 provos 536: id->key = k;
537: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 538: /* Increment the number of identities. */
539: tab->nentries++;
540: } else {
541: key_free(k);
1.157 canacar 542: xfree(id->comment);
1.33 markus 543: }
1.157 canacar 544: id->comment = comment;
545: id->death = death;
546: id->confirm = confirm;
1.33 markus 547: send:
1.1 deraadt 548: buffer_put_int(&e->output, 1);
1.33 markus 549: buffer_put_char(&e->output,
550: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 551: }
552:
1.88 markus 553: /* XXX todo: encrypt sensitive data with passphrase */
554: static void
555: process_lock_agent(SocketEntry *e, int lock)
556: {
1.96 deraadt 557: int success = 0;
1.88 markus 558: char *passwd;
559:
560: passwd = buffer_get_string(&e->request, NULL);
561: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
562: locked = 0;
563: memset(lock_passwd, 0, strlen(lock_passwd));
564: xfree(lock_passwd);
565: lock_passwd = NULL;
566: success = 1;
567: } else if (!locked && lock) {
568: locked = 1;
569: lock_passwd = xstrdup(passwd);
570: success = 1;
571: }
572: memset(passwd, 0, strlen(passwd));
573: xfree(passwd);
1.95 deraadt 574:
1.88 markus 575: buffer_put_int(&e->output, 1);
576: buffer_put_char(&e->output,
577: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
578: }
579:
580: static void
581: no_identities(SocketEntry *e, u_int type)
582: {
583: Buffer msg;
584:
585: buffer_init(&msg);
586: buffer_put_char(&msg,
587: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
588: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
589: buffer_put_int(&msg, 0);
590: buffer_put_int(&e->output, buffer_len(&msg));
591: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
592: buffer_free(&msg);
593: }
1.59 markus 594:
595: #ifdef SMARTCARD
596: static void
1.158 ! djm 597: process_add_smartcard_key(SocketEntry *e)
1.59 markus 598: {
1.96 deraadt 599: char *sc_reader_id = NULL, *pin;
1.158 ! djm 600: int i, type, version, success = 0, death = 0, confirm = 0;
1.96 deraadt 601: Key **keys, *k;
1.84 markus 602: Identity *id;
1.59 markus 603: Idtab *tab;
1.75 deraadt 604:
1.87 markus 605: sc_reader_id = buffer_get_string(&e->request, NULL);
606: pin = buffer_get_string(&e->request, NULL);
1.110 djm 607:
608: while (buffer_len(&e->request)) {
1.158 ! djm 609: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 610: case SSH_AGENT_CONSTRAIN_LIFETIME:
611: death = time(NULL) + buffer_get_int(&e->request);
612: break;
613: case SSH_AGENT_CONSTRAIN_CONFIRM:
614: confirm = 1;
615: break;
616: default:
1.158 ! djm 617: error("process_add_smartcard_key: "
! 618: "Unknown constraint type %d", type);
! 619: xfree(sc_reader_id);
! 620: xfree(pin);
! 621: goto send;
1.110 djm 622: }
623: }
624: if (lifetime && !death)
625: death = time(NULL) + lifetime;
626:
1.84 markus 627: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 628: xfree(sc_reader_id);
1.83 rees 629: xfree(pin);
1.59 markus 630:
1.84 markus 631: if (keys == NULL || keys[0] == NULL) {
632: error("sc_get_keys failed");
1.59 markus 633: goto send;
634: }
1.84 markus 635: for (i = 0; keys[i] != NULL; i++) {
636: k = keys[i];
637: version = k->type == KEY_RSA1 ? 1 : 2;
638: tab = idtab_lookup(version);
639: if (lookup_identity(k, version) == NULL) {
640: id = xmalloc(sizeof(Identity));
641: id->key = k;
1.111 markus 642: id->comment = sc_get_key_label(k);
1.110 djm 643: id->death = death;
644: id->confirm = confirm;
1.84 markus 645: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
646: tab->nentries++;
647: success = 1;
648: } else {
649: key_free(k);
650: }
651: keys[i] = NULL;
1.59 markus 652: }
1.84 markus 653: xfree(keys);
1.59 markus 654: send:
655: buffer_put_int(&e->output, 1);
656: buffer_put_char(&e->output,
657: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
658: }
659:
660: static void
661: process_remove_smartcard_key(SocketEntry *e)
662: {
1.96 deraadt 663: char *sc_reader_id = NULL, *pin;
664: int i, version, success = 0;
665: Key **keys, *k = NULL;
1.84 markus 666: Identity *id;
667: Idtab *tab;
1.59 markus 668:
1.87 markus 669: sc_reader_id = buffer_get_string(&e->request, NULL);
670: pin = buffer_get_string(&e->request, NULL);
1.84 markus 671: keys = sc_get_keys(sc_reader_id, pin);
1.69 markus 672: xfree(sc_reader_id);
1.83 rees 673: xfree(pin);
1.59 markus 674:
1.84 markus 675: if (keys == NULL || keys[0] == NULL) {
676: error("sc_get_keys failed");
677: goto send;
678: }
679: for (i = 0; keys[i] != NULL; i++) {
680: k = keys[i];
681: version = k->type == KEY_RSA1 ? 1 : 2;
682: if ((id = lookup_identity(k, version)) != NULL) {
683: tab = idtab_lookup(version);
1.90 markus 684: TAILQ_REMOVE(&tab->idlist, id, next);
1.59 markus 685: tab->nentries--;
1.78 provos 686: free_identity(id);
1.59 markus 687: success = 1;
688: }
689: key_free(k);
1.84 markus 690: keys[i] = NULL;
1.59 markus 691: }
1.84 markus 692: xfree(keys);
693: send:
1.59 markus 694: buffer_put_int(&e->output, 1);
695: buffer_put_char(&e->output,
696: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
697: }
1.70 jakob 698: #endif /* SMARTCARD */
1.59 markus 699:
1.33 markus 700: /* dispatch incoming messages */
701:
1.55 itojun 702: static void
1.2 provos 703: process_message(SocketEntry *e)
1.1 deraadt 704: {
1.96 deraadt 705: u_int msg_len, type;
1.45 markus 706: u_char *cp;
1.89 markus 707:
1.21 markus 708: if (buffer_len(&e->input) < 5)
709: return; /* Incomplete message. */
1.77 stevesk 710: cp = buffer_ptr(&e->input);
1.137 djm 711: msg_len = get_u32(cp);
1.21 markus 712: if (msg_len > 256 * 1024) {
1.101 stevesk 713: close_socket(e);
1.21 markus 714: return;
715: }
716: if (buffer_len(&e->input) < msg_len + 4)
717: return;
1.87 markus 718:
719: /* move the current input to e->request */
1.21 markus 720: buffer_consume(&e->input, 4);
1.87 markus 721: buffer_clear(&e->request);
722: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
723: buffer_consume(&e->input, msg_len);
724: type = buffer_get_char(&e->request);
1.21 markus 725:
1.88 markus 726: /* check wheter agent is locked */
727: if (locked && type != SSH_AGENTC_UNLOCK) {
728: buffer_clear(&e->request);
729: switch (type) {
730: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
731: case SSH2_AGENTC_REQUEST_IDENTITIES:
732: /* send empty lists */
733: no_identities(e, type);
734: break;
735: default:
736: /* send a fail message for all other request types */
737: buffer_put_int(&e->output, 1);
738: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
739: }
740: return;
741: }
742:
1.59 markus 743: debug("type %d", type);
1.21 markus 744: switch (type) {
1.88 markus 745: case SSH_AGENTC_LOCK:
746: case SSH_AGENTC_UNLOCK:
747: process_lock_agent(e, type == SSH_AGENTC_LOCK);
748: break;
1.33 markus 749: /* ssh1 */
750: case SSH_AGENTC_RSA_CHALLENGE:
751: process_authentication_challenge1(e);
752: break;
1.21 markus 753: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 754: process_request_identities(e, 1);
1.21 markus 755: break;
756: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 757: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 758: process_add_identity(e, 1);
1.21 markus 759: break;
760: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 761: process_remove_identity(e, 1);
1.21 markus 762: break;
763: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 764: process_remove_all_identities(e, 1);
765: break;
766: /* ssh2 */
767: case SSH2_AGENTC_SIGN_REQUEST:
768: process_sign_request2(e);
769: break;
770: case SSH2_AGENTC_REQUEST_IDENTITIES:
771: process_request_identities(e, 2);
772: break;
773: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 774: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 775: process_add_identity(e, 2);
776: break;
777: case SSH2_AGENTC_REMOVE_IDENTITY:
778: process_remove_identity(e, 2);
779: break;
780: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
781: process_remove_all_identities(e, 2);
1.21 markus 782: break;
1.59 markus 783: #ifdef SMARTCARD
784: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 785: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 786: process_add_smartcard_key(e);
1.75 deraadt 787: break;
1.59 markus 788: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
789: process_remove_smartcard_key(e);
1.75 deraadt 790: break;
1.70 jakob 791: #endif /* SMARTCARD */
1.21 markus 792: default:
793: /* Unknown message. Respond with failure. */
794: error("Unknown message %d", type);
1.87 markus 795: buffer_clear(&e->request);
1.21 markus 796: buffer_put_int(&e->output, 1);
797: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
798: break;
799: }
1.1 deraadt 800: }
801:
1.55 itojun 802: static void
1.73 stevesk 803: new_socket(sock_type type, int fd)
1.1 deraadt 804: {
1.112 markus 805: u_int i, old_alloc, new_alloc;
1.96 deraadt 806:
1.119 djm 807: set_nonblock(fd);
1.21 markus 808:
809: if (fd > max_fd)
810: max_fd = fd;
811:
812: for (i = 0; i < sockets_alloc; i++)
813: if (sockets[i].type == AUTH_UNUSED) {
814: sockets[i].fd = fd;
815: buffer_init(&sockets[i].input);
816: buffer_init(&sockets[i].output);
1.87 markus 817: buffer_init(&sockets[i].request);
1.112 markus 818: sockets[i].type = type;
1.21 markus 819: return;
820: }
821: old_alloc = sockets_alloc;
1.112 markus 822: new_alloc = sockets_alloc + 10;
1.133 djm 823: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 824: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 825: sockets[i].type = AUTH_UNUSED;
1.112 markus 826: sockets_alloc = new_alloc;
1.21 markus 827: sockets[old_alloc].fd = fd;
828: buffer_init(&sockets[old_alloc].input);
829: buffer_init(&sockets[old_alloc].output);
1.87 markus 830: buffer_init(&sockets[old_alloc].request);
1.112 markus 831: sockets[old_alloc].type = type;
1.1 deraadt 832: }
833:
1.55 itojun 834: static int
1.155 dtucker 835: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
836: struct timeval **tvpp)
1.1 deraadt 837: {
1.155 dtucker 838: u_int i, sz, deadline;
1.46 markus 839: int n = 0;
1.155 dtucker 840: static struct timeval tv;
1.46 markus 841:
842: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 843: switch (sockets[i].type) {
844: case AUTH_SOCKET:
845: case AUTH_CONNECTION:
1.46 markus 846: n = MAX(n, sockets[i].fd);
1.21 markus 847: break;
848: case AUTH_UNUSED:
849: break;
850: default:
851: fatal("Unknown socket type %d", sockets[i].type);
852: break;
853: }
1.46 markus 854: }
855:
856: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 857: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 858: if (*fdrp)
1.54 stevesk 859: xfree(*fdrp);
1.46 markus 860: if (*fdwp)
1.54 stevesk 861: xfree(*fdwp);
1.46 markus 862: *fdrp = xmalloc(sz);
863: *fdwp = xmalloc(sz);
1.66 markus 864: *nallocp = sz;
1.46 markus 865: }
1.66 markus 866: if (n < *fdl)
867: debug("XXX shrink: %d < %d", n, *fdl);
868: *fdl = n;
1.46 markus 869: memset(*fdrp, 0, sz);
870: memset(*fdwp, 0, sz);
871:
872: for (i = 0; i < sockets_alloc; i++) {
873: switch (sockets[i].type) {
874: case AUTH_SOCKET:
875: case AUTH_CONNECTION:
876: FD_SET(sockets[i].fd, *fdrp);
877: if (buffer_len(&sockets[i].output) > 0)
878: FD_SET(sockets[i].fd, *fdwp);
879: break;
880: default:
881: break;
882: }
883: }
1.155 dtucker 884: deadline = reaper();
885: if (parent_alive_interval != 0)
886: deadline = (deadline == 0) ? parent_alive_interval :
887: MIN(deadline, parent_alive_interval);
888: if (deadline == 0) {
889: *tvpp = NULL;
890: } else {
891: tv.tv_sec = deadline;
892: tv.tv_usec = 0;
893: *tvpp = &tv;
894: }
1.46 markus 895: return (1);
1.21 markus 896: }
897:
1.55 itojun 898: static void
1.21 markus 899: after_select(fd_set *readset, fd_set *writeset)
900: {
1.96 deraadt 901: struct sockaddr_un sunaddr;
1.26 markus 902: socklen_t slen;
1.21 markus 903: char buf[1024];
1.96 deraadt 904: int len, sock;
905: u_int i;
1.103 markus 906: uid_t euid;
907: gid_t egid;
1.21 markus 908:
909: for (i = 0; i < sockets_alloc; i++)
910: switch (sockets[i].type) {
911: case AUTH_UNUSED:
912: break;
913: case AUTH_SOCKET:
914: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 915: slen = sizeof(sunaddr);
1.46 markus 916: sock = accept(sockets[i].fd,
1.131 deraadt 917: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 918: if (sock < 0) {
1.81 stevesk 919: error("accept from AUTH_SOCKET: %s",
920: strerror(errno));
1.103 markus 921: break;
922: }
923: if (getpeereid(sock, &euid, &egid) < 0) {
924: error("getpeereid %d failed: %s",
925: sock, strerror(errno));
926: close(sock);
927: break;
928: }
1.105 markus 929: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 930: error("uid mismatch: "
1.104 stevesk 931: "peer euid %u != uid %u",
932: (u_int) euid, (u_int) getuid());
1.103 markus 933: close(sock);
1.21 markus 934: break;
935: }
936: new_socket(AUTH_CONNECTION, sock);
937: }
938: break;
939: case AUTH_CONNECTION:
940: if (buffer_len(&sockets[i].output) > 0 &&
941: FD_ISSET(sockets[i].fd, writeset)) {
1.52 deraadt 942: do {
943: len = write(sockets[i].fd,
944: buffer_ptr(&sockets[i].output),
945: buffer_len(&sockets[i].output));
946: if (len == -1 && (errno == EAGAIN ||
947: errno == EINTR))
948: continue;
949: break;
950: } while (1);
1.21 markus 951: if (len <= 0) {
1.101 stevesk 952: close_socket(&sockets[i]);
1.21 markus 953: break;
954: }
955: buffer_consume(&sockets[i].output, len);
956: }
957: if (FD_ISSET(sockets[i].fd, readset)) {
1.52 deraadt 958: do {
959: len = read(sockets[i].fd, buf, sizeof(buf));
960: if (len == -1 && (errno == EAGAIN ||
961: errno == EINTR))
962: continue;
963: break;
964: } while (1);
1.21 markus 965: if (len <= 0) {
1.101 stevesk 966: close_socket(&sockets[i]);
1.21 markus 967: break;
968: }
969: buffer_append(&sockets[i].input, buf, len);
970: process_message(&sockets[i]);
971: }
972: break;
973: default:
974: fatal("Unknown type %d", sockets[i].type);
975: }
1.1 deraadt 976: }
977:
1.55 itojun 978: static void
1.113 markus 979: cleanup_socket(void)
1.15 markus 980: {
1.48 deraadt 981: if (socket_name[0])
982: unlink(socket_name);
983: if (socket_dir[0])
984: rmdir(socket_dir);
1.10 markus 985: }
986:
1.114 markus 987: void
1.15 markus 988: cleanup_exit(int i)
989: {
1.113 markus 990: cleanup_socket();
991: _exit(i);
1.15 markus 992: }
993:
1.135 deraadt 994: /*ARGSUSED*/
1.55 itojun 995: static void
1.48 deraadt 996: cleanup_handler(int sig)
997: {
1.113 markus 998: cleanup_socket();
1.48 deraadt 999: _exit(2);
1.113 markus 1000: }
1001:
1.68 markus 1002: static void
1.155 dtucker 1003: check_parent_exists(void)
1.68 markus 1004: {
1005: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
1006: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1007: cleanup_socket();
1008: _exit(2);
1.68 markus 1009: }
1.48 deraadt 1010: }
1011:
1.55 itojun 1012: static void
1.50 itojun 1013: usage(void)
1.15 markus 1014: {
1.156 sobrado 1015: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1016: __progname);
1.72 jakob 1017: fprintf(stderr, "Options:\n");
1018: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1019: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1020: fprintf(stderr, " -k Kill the current agent.\n");
1021: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1022: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1023: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1024: exit(1);
1.15 markus 1025: }
1026:
1.2 provos 1027: int
1028: main(int ac, char **av)
1.1 deraadt 1029: {
1.107 markus 1030: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1031: int sock, fd, ch, result, saved_errno;
1.120 avsm 1032: u_int nalloc;
1.96 deraadt 1033: char *shell, *format, *pidstr, *agentsocket = NULL;
1034: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1035: struct sockaddr_un sunaddr;
1.41 markus 1036: struct rlimit rlim;
1.96 deraadt 1037: extern int optind;
1.98 stevesk 1038: extern char *optarg;
1.21 markus 1039: pid_t pid;
1.96 deraadt 1040: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1041: struct timeval *tvp = NULL;
1.123 djm 1042:
1043: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1044: sanitise_stdfd();
1.99 markus 1045:
1046: /* drop */
1047: setegid(getgid());
1048: setgid(getgid());
1.53 markus 1049:
1050: SSLeay_add_all_algorithms();
1.21 markus 1051:
1.106 marc 1052: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1053: switch (ch) {
1054: case 'c':
1055: if (s_flag)
1056: usage();
1057: c_flag++;
1058: break;
1059: case 'k':
1060: k_flag++;
1061: break;
1062: case 's':
1063: if (c_flag)
1064: usage();
1065: s_flag++;
1066: break;
1.57 markus 1067: case 'd':
1068: if (d_flag)
1069: usage();
1070: d_flag++;
1071: break;
1.86 markus 1072: case 'a':
1073: agentsocket = optarg;
1.106 marc 1074: break;
1075: case 't':
1076: if ((lifetime = convtime(optarg)) == -1) {
1077: fprintf(stderr, "Invalid lifetime\n");
1078: usage();
1079: }
1.86 markus 1080: break;
1.21 markus 1081: default:
1082: usage();
1083: }
1084: }
1085: ac -= optind;
1086: av += optind;
1087:
1.57 markus 1088: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1089: usage();
1090:
1.85 markus 1091: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1092: shell = getenv("SHELL");
1.136 deraadt 1093: if (shell != NULL &&
1094: strncmp(shell + strlen(shell) - 3, "csh", 3) == 0)
1.21 markus 1095: c_flag = 1;
1096: }
1097: if (k_flag) {
1.136 deraadt 1098: const char *errstr = NULL;
1099:
1.21 markus 1100: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1101: if (pidstr == NULL) {
1102: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1103: SSH_AGENTPID_ENV_NAME);
1.21 markus 1104: exit(1);
1105: }
1.136 deraadt 1106: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1107: if (errstr) {
1108: fprintf(stderr,
1109: "%s=\"%s\", which is not a good PID: %s\n",
1110: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1111: exit(1);
1112: }
1113: if (kill(pid, SIGTERM) == -1) {
1114: perror("kill");
1115: exit(1);
1116: }
1117: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1118: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1119: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1120: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1121: exit(0);
1122: }
1123: parent_pid = getpid();
1124:
1.86 markus 1125: if (agentsocket == NULL) {
1126: /* Create private directory for agent socket */
1.115 markus 1127: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1128: if (mkdtemp(socket_dir) == NULL) {
1129: perror("mkdtemp: private socket dir");
1130: exit(1);
1131: }
1.91 mpech 1132: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1133: (long)parent_pid);
1.86 markus 1134: } else {
1135: /* Try to use specified agent socket */
1136: socket_dir[0] = '\0';
1137: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1138: }
1139:
1.23 markus 1140: /*
1141: * Create socket early so it will exist before command gets run from
1142: * the parent.
1143: */
1.21 markus 1144: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1145: if (sock < 0) {
1146: perror("socket");
1.121 djm 1147: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1148: cleanup_exit(1);
1149: }
1150: memset(&sunaddr, 0, sizeof(sunaddr));
1151: sunaddr.sun_family = AF_UNIX;
1152: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1153: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1154: perror("bind");
1.121 djm 1155: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1156: cleanup_exit(1);
1157: }
1.117 markus 1158: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1159: perror("listen");
1160: cleanup_exit(1);
1161: }
1.46 markus 1162:
1.23 markus 1163: /*
1164: * Fork, and have the parent execute the command, if any, or present
1165: * the socket data. The child continues as the authentication agent.
1166: */
1.57 markus 1167: if (d_flag) {
1168: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1169: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1170: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1171: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1172: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1173: goto skip;
1174: }
1.21 markus 1175: pid = fork();
1176: if (pid == -1) {
1177: perror("fork");
1.81 stevesk 1178: cleanup_exit(1);
1.21 markus 1179: }
1180: if (pid != 0) { /* Parent - execute the given command. */
1181: close(sock);
1.91 mpech 1182: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1183: if (ac == 0) {
1184: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1185: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1186: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1187: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1188: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1189: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1190: exit(0);
1191: }
1.36 deraadt 1192: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1193: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1194: perror("setenv");
1195: exit(1);
1196: }
1.21 markus 1197: execvp(av[0], av);
1198: perror(av[0]);
1199: exit(1);
1200: }
1.81 stevesk 1201: /* child */
1202: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1203:
1204: if (setsid() == -1) {
1.81 stevesk 1205: error("setsid: %s", strerror(errno));
1.67 stevesk 1206: cleanup_exit(1);
1207: }
1208:
1209: (void)chdir("/");
1.107 markus 1210: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1211: /* XXX might close listen socket */
1212: (void)dup2(fd, STDIN_FILENO);
1213: (void)dup2(fd, STDOUT_FILENO);
1214: (void)dup2(fd, STDERR_FILENO);
1215: if (fd > 2)
1216: close(fd);
1217: }
1.21 markus 1218:
1.41 markus 1219: /* deny core dumps, since memory contains unencrypted private keys */
1220: rlim.rlim_cur = rlim.rlim_max = 0;
1221: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1222: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1223: cleanup_exit(1);
1224: }
1.57 markus 1225:
1226: skip:
1.21 markus 1227: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1228: if (ac > 0)
1229: parent_alive_interval = 10;
1.33 markus 1230: idtab_init();
1.61 markus 1231: if (!d_flag)
1.57 markus 1232: signal(SIGINT, SIG_IGN);
1.61 markus 1233: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1234: signal(SIGHUP, cleanup_handler);
1235: signal(SIGTERM, cleanup_handler);
1.66 markus 1236: nalloc = 0;
1237:
1.21 markus 1238: while (1) {
1.155 dtucker 1239: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1240: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1241: saved_errno = errno;
1.155 dtucker 1242: if (parent_alive_interval != 0)
1243: check_parent_exists();
1244: (void) reaper(); /* remove expired keys */
1.154 dtucker 1245: if (result < 0) {
1246: if (saved_errno == EINTR)
1.21 markus 1247: continue;
1.154 dtucker 1248: fatal("select: %s", strerror(saved_errno));
1249: } else if (result > 0)
1250: after_select(readsetp, writesetp);
1.15 markus 1251: }
1.21 markus 1252: /* NOTREACHED */
1.1 deraadt 1253: }
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