Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.164
1.164 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.163 2010/02/08 10:50:20 markus Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.128 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:
1.163 markus 69: #ifdef ENABLE_PKCS11
70: #include "ssh-pkcs11.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;
1.163 markus 94: char *provider;
1.89 markus 95: u_int death;
1.107 markus 96: u_int confirm;
1.1 deraadt 97: } Identity;
98:
1.33 markus 99: typedef struct {
100: int nentries;
1.78 provos 101: TAILQ_HEAD(idqueue, identity) idlist;
1.33 markus 102: } Idtab;
103:
104: /* private key table, one per protocol version */
105: Idtab idtable[3];
1.1 deraadt 106:
107: int max_fd = 0;
108:
1.11 markus 109: /* pid of shell == parent of agent */
1.29 deraadt 110: pid_t parent_pid = -1;
1.155 dtucker 111: u_int parent_alive_interval = 0;
1.10 markus 112:
113: /* pathname and directory for AUTH_SOCKET */
1.132 djm 114: char socket_name[MAXPATHLEN];
115: char socket_dir[MAXPATHLEN];
1.10 markus 116:
1.88 markus 117: /* locking */
118: int locked = 0;
119: char *lock_passwd = NULL;
120:
1.20 markus 121: extern char *__progname;
122:
1.106 marc 123: /* Default lifetime (0 == forever) */
124: static int lifetime = 0;
125:
1.55 itojun 126: static void
1.101 stevesk 127: close_socket(SocketEntry *e)
128: {
129: close(e->fd);
130: e->fd = -1;
131: e->type = AUTH_UNUSED;
132: buffer_free(&e->input);
133: buffer_free(&e->output);
134: buffer_free(&e->request);
135: }
136:
137: static void
1.33 markus 138: idtab_init(void)
1.1 deraadt 139: {
1.33 markus 140: int i;
1.96 deraadt 141:
1.74 deraadt 142: for (i = 0; i <=2; i++) {
1.78 provos 143: TAILQ_INIT(&idtable[i].idlist);
1.33 markus 144: idtable[i].nentries = 0;
145: }
146: }
147:
148: /* return private key table for requested protocol version */
1.55 itojun 149: static Idtab *
1.33 markus 150: idtab_lookup(int version)
151: {
152: if (version < 1 || version > 2)
153: fatal("internal error, bad protocol version %d", version);
154: return &idtable[version];
155: }
156:
1.89 markus 157: static void
158: free_identity(Identity *id)
159: {
160: key_free(id->key);
1.164 ! djm 161: if (id->provider != NULL)
! 162: xfree(id->provider);
1.89 markus 163: xfree(id->comment);
164: xfree(id);
165: }
166:
1.33 markus 167: /* return matching private key for given public key */
1.78 provos 168: static Identity *
169: lookup_identity(Key *key, int version)
1.33 markus 170: {
1.78 provos 171: Identity *id;
172:
1.33 markus 173: Idtab *tab = idtab_lookup(version);
1.78 provos 174: TAILQ_FOREACH(id, &tab->idlist, next) {
175: if (key_equal(key, id->key))
176: return (id);
1.33 markus 177: }
1.78 provos 178: return (NULL);
179: }
180:
1.107 markus 181: /* Check confirmation of keysign request */
182: static int
183: confirm_key(Identity *id)
184: {
1.122 djm 185: char *p;
1.107 markus 186: int ret = -1;
187:
188: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 189: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
190: id->comment, p))
191: ret = 0;
1.107 markus 192: xfree(p);
1.122 djm 193:
1.107 markus 194: return (ret);
195: }
196:
1.33 markus 197: /* send list of supported public keys to 'client' */
1.55 itojun 198: static void
1.33 markus 199: process_request_identities(SocketEntry *e, int version)
200: {
201: Idtab *tab = idtab_lookup(version);
1.96 deraadt 202: Identity *id;
1.21 markus 203: Buffer msg;
1.1 deraadt 204:
1.21 markus 205: buffer_init(&msg);
1.33 markus 206: buffer_put_char(&msg, (version == 1) ?
207: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
208: buffer_put_int(&msg, tab->nentries);
1.78 provos 209: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 210: if (id->key->type == KEY_RSA1) {
1.33 markus 211: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
212: buffer_put_bignum(&msg, id->key->rsa->e);
213: buffer_put_bignum(&msg, id->key->rsa->n);
214: } else {
1.45 markus 215: u_char *blob;
216: u_int blen;
1.39 markus 217: key_to_blob(id->key, &blob, &blen);
1.33 markus 218: buffer_put_string(&msg, blob, blen);
219: xfree(blob);
220: }
221: buffer_put_cstring(&msg, id->comment);
1.21 markus 222: }
223: buffer_put_int(&e->output, buffer_len(&msg));
224: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
225: buffer_free(&msg);
1.1 deraadt 226: }
227:
1.33 markus 228: /* ssh1 only */
1.55 itojun 229: static void
1.33 markus 230: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 231: {
1.96 deraadt 232: u_char buf[32], mdbuf[16], session_id[16];
233: u_int response_type;
234: BIGNUM *challenge;
1.78 provos 235: Identity *id;
1.33 markus 236: int i, len;
1.21 markus 237: Buffer msg;
238: MD5_CTX md;
1.96 deraadt 239: Key *key;
1.21 markus 240:
241: buffer_init(&msg);
1.39 markus 242: key = key_new(KEY_RSA1);
1.76 markus 243: if ((challenge = BN_new()) == NULL)
244: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 245:
1.97 markus 246: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 247: buffer_get_bignum(&e->request, key->rsa->e);
248: buffer_get_bignum(&e->request, key->rsa->n);
249: buffer_get_bignum(&e->request, challenge);
1.21 markus 250:
1.33 markus 251: /* Only protocol 1.1 is supported */
1.87 markus 252: if (buffer_len(&e->request) == 0)
1.33 markus 253: goto failure;
1.87 markus 254: buffer_get(&e->request, session_id, 16);
255: response_type = buffer_get_int(&e->request);
1.33 markus 256: if (response_type != 1)
257: goto failure;
258:
1.78 provos 259: id = lookup_identity(key, 1);
1.107 markus 260: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 261: Key *private = id->key;
1.33 markus 262: /* Decrypt the challenge using the private key. */
1.49 markus 263: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
264: goto failure;
1.33 markus 265:
266: /* The response is MD5 of decrypted challenge plus session id. */
267: len = BN_num_bytes(challenge);
268: if (len <= 0 || len > 32) {
1.109 itojun 269: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 270: goto failure;
271: }
272: memset(buf, 0, 32);
273: BN_bn2bin(challenge, buf + 32 - len);
274: MD5_Init(&md);
275: MD5_Update(&md, buf, 32);
276: MD5_Update(&md, session_id, 16);
277: MD5_Final(mdbuf, &md);
278:
279: /* Send the response. */
280: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
281: for (i = 0; i < 16; i++)
282: buffer_put_char(&msg, mdbuf[i]);
283: goto send;
284: }
1.21 markus 285:
1.33 markus 286: failure:
287: /* Unknown identity or protocol error. Send failure. */
1.21 markus 288: buffer_put_char(&msg, SSH_AGENT_FAILURE);
289: send:
290: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 291: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
292: key_free(key);
293: BN_clear_free(challenge);
294: buffer_free(&msg);
295: }
296:
297: /* ssh2 only */
1.55 itojun 298: static void
1.33 markus 299: process_sign_request2(SocketEntry *e)
300: {
1.45 markus 301: u_char *blob, *data, *signature = NULL;
302: u_int blen, dlen, slen = 0;
1.96 deraadt 303: extern int datafellows;
1.159 djm 304: int odatafellows;
1.96 deraadt 305: int ok = -1, flags;
1.33 markus 306: Buffer msg;
1.96 deraadt 307: Key *key;
1.33 markus 308:
309: datafellows = 0;
1.43 markus 310:
1.87 markus 311: blob = buffer_get_string(&e->request, &blen);
312: data = buffer_get_string(&e->request, &dlen);
1.37 markus 313:
1.87 markus 314: flags = buffer_get_int(&e->request);
1.159 djm 315: odatafellows = datafellows;
1.37 markus 316: if (flags & SSH_AGENT_OLD_SIGNATURE)
317: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 318:
1.39 markus 319: key = key_from_blob(blob, blen);
1.33 markus 320: if (key != NULL) {
1.78 provos 321: Identity *id = lookup_identity(key, 2);
1.107 markus 322: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 323: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 324: key_free(key);
1.33 markus 325: }
326: buffer_init(&msg);
327: if (ok == 0) {
328: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
329: buffer_put_string(&msg, signature, slen);
330: } else {
331: buffer_put_char(&msg, SSH_AGENT_FAILURE);
332: }
333: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 334: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 335: buffer_len(&msg));
1.21 markus 336: buffer_free(&msg);
1.33 markus 337: xfree(data);
338: xfree(blob);
339: if (signature != NULL)
340: xfree(signature);
1.159 djm 341: datafellows = odatafellows;
1.1 deraadt 342: }
343:
1.33 markus 344: /* shared */
1.55 itojun 345: static void
1.33 markus 346: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 347: {
1.96 deraadt 348: u_int blen, bits;
349: int success = 0;
1.78 provos 350: Key *key = NULL;
1.45 markus 351: u_char *blob;
1.21 markus 352:
1.74 deraadt 353: switch (version) {
1.33 markus 354: case 1:
1.39 markus 355: key = key_new(KEY_RSA1);
1.87 markus 356: bits = buffer_get_int(&e->request);
357: buffer_get_bignum(&e->request, key->rsa->e);
358: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 359:
360: if (bits != key_size(key))
1.109 itojun 361: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 362: key_size(key), bits);
1.33 markus 363: break;
364: case 2:
1.87 markus 365: blob = buffer_get_string(&e->request, &blen);
1.39 markus 366: key = key_from_blob(blob, blen);
1.33 markus 367: xfree(blob);
368: break;
369: }
370: if (key != NULL) {
1.78 provos 371: Identity *id = lookup_identity(key, version);
372: if (id != NULL) {
1.23 markus 373: /*
374: * We have this key. Free the old key. Since we
1.124 djm 375: * don't want to leave empty slots in the middle of
1.40 markus 376: * the array, we actually free the key there and move
377: * all the entries between the empty slot and the end
378: * of the array.
1.23 markus 379: */
1.33 markus 380: Idtab *tab = idtab_lookup(version);
1.38 markus 381: if (tab->nentries < 1)
382: fatal("process_remove_identity: "
383: "internal error: tab->nentries %d",
384: tab->nentries);
1.78 provos 385: TAILQ_REMOVE(&tab->idlist, id, next);
386: free_identity(id);
1.33 markus 387: tab->nentries--;
388: success = 1;
1.21 markus 389: }
1.33 markus 390: key_free(key);
391: }
1.1 deraadt 392: buffer_put_int(&e->output, 1);
1.33 markus 393: buffer_put_char(&e->output,
394: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 395: }
396:
1.55 itojun 397: static void
1.33 markus 398: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 399: {
1.33 markus 400: Idtab *tab = idtab_lookup(version);
1.78 provos 401: Identity *id;
1.21 markus 402:
403: /* Loop over all identities and clear the keys. */
1.78 provos 404: for (id = TAILQ_FIRST(&tab->idlist); id;
405: id = TAILQ_FIRST(&tab->idlist)) {
406: TAILQ_REMOVE(&tab->idlist, id, next);
407: free_identity(id);
1.21 markus 408: }
409:
410: /* Mark that there are no identities. */
1.33 markus 411: tab->nentries = 0;
1.21 markus 412:
413: /* Send success. */
414: buffer_put_int(&e->output, 1);
415: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 416: }
417:
1.155 dtucker 418: /* removes expired keys and returns number of seconds until the next expiry */
419: static u_int
1.89 markus 420: reaper(void)
421: {
1.155 dtucker 422: u_int deadline = 0, now = time(NULL);
1.89 markus 423: Identity *id, *nxt;
424: int version;
1.96 deraadt 425: Idtab *tab;
1.89 markus 426:
427: for (version = 1; version < 3; version++) {
428: tab = idtab_lookup(version);
429: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
430: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 431: if (id->death == 0)
432: continue;
433: if (now >= id->death) {
1.154 dtucker 434: debug("expiring key '%s'", id->comment);
1.89 markus 435: TAILQ_REMOVE(&tab->idlist, id, next);
436: free_identity(id);
437: tab->nentries--;
1.155 dtucker 438: } else
439: deadline = (deadline == 0) ? id->death :
440: MIN(deadline, id->death);
1.89 markus 441: }
442: }
1.155 dtucker 443: if (deadline == 0 || deadline <= now)
444: return 0;
445: else
446: return (deadline - now);
1.89 markus 447: }
448:
449: static void
1.33 markus 450: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 451: {
1.96 deraadt 452: Idtab *tab = idtab_lookup(version);
1.157 canacar 453: Identity *id;
1.107 markus 454: int type, success = 0, death = 0, confirm = 0;
1.96 deraadt 455: char *type_name, *comment;
1.33 markus 456: Key *k = NULL;
457:
458: switch (version) {
459: case 1:
1.39 markus 460: k = key_new_private(KEY_RSA1);
1.97 markus 461: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 462: buffer_get_bignum(&e->request, k->rsa->n);
463: buffer_get_bignum(&e->request, k->rsa->e);
464: buffer_get_bignum(&e->request, k->rsa->d);
465: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 466:
467: /* SSH and SSL have p and q swapped */
1.87 markus 468: buffer_get_bignum(&e->request, k->rsa->q); /* p */
469: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 470:
471: /* Generate additional parameters */
1.60 markus 472: rsa_generate_additional_parameters(k->rsa);
1.33 markus 473: break;
474: case 2:
1.87 markus 475: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 476: type = key_type_from_name(type_name);
1.39 markus 477: xfree(type_name);
1.74 deraadt 478: switch (type) {
1.39 markus 479: case KEY_DSA:
480: k = key_new_private(type);
1.87 markus 481: buffer_get_bignum2(&e->request, k->dsa->p);
482: buffer_get_bignum2(&e->request, k->dsa->q);
483: buffer_get_bignum2(&e->request, k->dsa->g);
484: buffer_get_bignum2(&e->request, k->dsa->pub_key);
485: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 486: break;
487: case KEY_RSA:
488: k = key_new_private(type);
1.87 markus 489: buffer_get_bignum2(&e->request, k->rsa->n);
490: buffer_get_bignum2(&e->request, k->rsa->e);
491: buffer_get_bignum2(&e->request, k->rsa->d);
492: buffer_get_bignum2(&e->request, k->rsa->iqmp);
493: buffer_get_bignum2(&e->request, k->rsa->p);
494: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 495:
496: /* Generate additional parameters */
1.60 markus 497: rsa_generate_additional_parameters(k->rsa);
1.39 markus 498: break;
499: default:
1.87 markus 500: buffer_clear(&e->request);
1.108 markus 501: goto send;
502: }
503: break;
504: }
505: /* enable blinding */
506: switch (k->type) {
507: case KEY_RSA:
508: case KEY_RSA1:
509: if (RSA_blinding_on(k->rsa, NULL) != 1) {
510: error("process_add_identity: RSA_blinding_on failed");
511: key_free(k);
1.33 markus 512: goto send;
1.21 markus 513: }
1.33 markus 514: break;
515: }
1.87 markus 516: comment = buffer_get_string(&e->request, NULL);
1.33 markus 517: if (k == NULL) {
518: xfree(comment);
519: goto send;
520: }
1.94 markus 521: while (buffer_len(&e->request)) {
1.158 djm 522: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 523: case SSH_AGENT_CONSTRAIN_LIFETIME:
524: death = time(NULL) + buffer_get_int(&e->request);
525: break;
1.107 markus 526: case SSH_AGENT_CONSTRAIN_CONFIRM:
527: confirm = 1;
528: break;
1.94 markus 529: default:
1.158 djm 530: error("process_add_identity: "
531: "Unknown constraint type %d", type);
532: xfree(comment);
533: key_free(k);
534: goto send;
1.94 markus 535: }
536: }
1.158 djm 537: success = 1;
1.106 marc 538: if (lifetime && !death)
539: death = time(NULL) + lifetime;
1.157 canacar 540: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 541: id = xcalloc(1, sizeof(Identity));
1.78 provos 542: id->key = k;
543: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 544: /* Increment the number of identities. */
545: tab->nentries++;
546: } else {
547: key_free(k);
1.157 canacar 548: xfree(id->comment);
1.33 markus 549: }
1.157 canacar 550: id->comment = comment;
551: id->death = death;
552: id->confirm = confirm;
1.33 markus 553: send:
1.1 deraadt 554: buffer_put_int(&e->output, 1);
1.33 markus 555: buffer_put_char(&e->output,
556: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 557: }
558:
1.88 markus 559: /* XXX todo: encrypt sensitive data with passphrase */
560: static void
561: process_lock_agent(SocketEntry *e, int lock)
562: {
1.96 deraadt 563: int success = 0;
1.88 markus 564: char *passwd;
565:
566: passwd = buffer_get_string(&e->request, NULL);
567: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
568: locked = 0;
569: memset(lock_passwd, 0, strlen(lock_passwd));
570: xfree(lock_passwd);
571: lock_passwd = NULL;
572: success = 1;
573: } else if (!locked && lock) {
574: locked = 1;
575: lock_passwd = xstrdup(passwd);
576: success = 1;
577: }
578: memset(passwd, 0, strlen(passwd));
579: xfree(passwd);
1.95 deraadt 580:
1.88 markus 581: buffer_put_int(&e->output, 1);
582: buffer_put_char(&e->output,
583: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
584: }
585:
586: static void
587: no_identities(SocketEntry *e, u_int type)
588: {
589: Buffer msg;
590:
591: buffer_init(&msg);
592: buffer_put_char(&msg,
593: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
594: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
595: buffer_put_int(&msg, 0);
596: buffer_put_int(&e->output, buffer_len(&msg));
597: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
598: buffer_free(&msg);
599: }
1.59 markus 600:
1.163 markus 601: #ifdef ENABLE_PKCS11
1.59 markus 602: static void
1.158 djm 603: process_add_smartcard_key(SocketEntry *e)
1.59 markus 604: {
1.163 markus 605: char *provider = NULL, *pin;
606: int i, type, version, count = 0, success = 0, death = 0, confirm = 0;
607: Key **keys = NULL, *k;
1.84 markus 608: Identity *id;
1.59 markus 609: Idtab *tab;
1.75 deraadt 610:
1.163 markus 611: provider = buffer_get_string(&e->request, NULL);
1.87 markus 612: pin = buffer_get_string(&e->request, NULL);
1.110 djm 613:
614: while (buffer_len(&e->request)) {
1.158 djm 615: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 616: case SSH_AGENT_CONSTRAIN_LIFETIME:
617: death = time(NULL) + buffer_get_int(&e->request);
618: break;
619: case SSH_AGENT_CONSTRAIN_CONFIRM:
620: confirm = 1;
621: break;
622: default:
1.158 djm 623: error("process_add_smartcard_key: "
624: "Unknown constraint type %d", type);
625: goto send;
1.110 djm 626: }
627: }
628: if (lifetime && !death)
629: death = time(NULL) + lifetime;
630:
1.163 markus 631: count = pkcs11_add_provider(provider, pin, &keys);
632: for (i = 0; i < count; i++) {
1.84 markus 633: k = keys[i];
634: version = k->type == KEY_RSA1 ? 1 : 2;
635: tab = idtab_lookup(version);
636: if (lookup_identity(k, version) == NULL) {
1.163 markus 637: id = xcalloc(1, sizeof(Identity));
1.84 markus 638: id->key = k;
1.163 markus 639: id->provider = xstrdup(provider);
640: id->comment = xstrdup(provider); /* XXX */
1.110 djm 641: id->death = death;
642: id->confirm = confirm;
1.84 markus 643: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
644: tab->nentries++;
645: success = 1;
646: } else {
647: key_free(k);
648: }
649: keys[i] = NULL;
1.59 markus 650: }
651: send:
1.163 markus 652: if (pin)
653: xfree(pin);
654: if (provider)
655: xfree(provider);
656: if (keys)
657: xfree(keys);
1.59 markus 658: buffer_put_int(&e->output, 1);
659: buffer_put_char(&e->output,
660: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
661: }
662:
663: static void
664: process_remove_smartcard_key(SocketEntry *e)
665: {
1.163 markus 666: char *provider = NULL, *pin = NULL;
667: int version, success = 0;
668: Identity *id, *nxt;
1.84 markus 669: Idtab *tab;
1.59 markus 670:
1.163 markus 671: provider = buffer_get_string(&e->request, NULL);
1.87 markus 672: pin = buffer_get_string(&e->request, NULL);
1.83 rees 673: xfree(pin);
1.59 markus 674:
1.163 markus 675: for (version = 1; version < 3; version++) {
676: tab = idtab_lookup(version);
677: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
678: nxt = TAILQ_NEXT(id, next);
679: if (!strcmp(provider, id->provider)) {
680: TAILQ_REMOVE(&tab->idlist, id, next);
681: free_identity(id);
682: tab->nentries--;
683: }
1.59 markus 684: }
685: }
1.163 markus 686: if (pkcs11_del_provider(provider) == 0)
687: success = 1;
688: else
689: error("process_remove_smartcard_key:"
690: " pkcs11_del_provider failed");
691: xfree(provider);
1.59 markus 692: buffer_put_int(&e->output, 1);
693: buffer_put_char(&e->output,
694: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
695: }
1.163 markus 696: #endif /* ENABLE_PKCS11 */
1.59 markus 697:
1.33 markus 698: /* dispatch incoming messages */
699:
1.55 itojun 700: static void
1.2 provos 701: process_message(SocketEntry *e)
1.1 deraadt 702: {
1.96 deraadt 703: u_int msg_len, type;
1.45 markus 704: u_char *cp;
1.89 markus 705:
1.21 markus 706: if (buffer_len(&e->input) < 5)
707: return; /* Incomplete message. */
1.77 stevesk 708: cp = buffer_ptr(&e->input);
1.137 djm 709: msg_len = get_u32(cp);
1.21 markus 710: if (msg_len > 256 * 1024) {
1.101 stevesk 711: close_socket(e);
1.21 markus 712: return;
713: }
714: if (buffer_len(&e->input) < msg_len + 4)
715: return;
1.87 markus 716:
717: /* move the current input to e->request */
1.21 markus 718: buffer_consume(&e->input, 4);
1.87 markus 719: buffer_clear(&e->request);
720: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
721: buffer_consume(&e->input, msg_len);
722: type = buffer_get_char(&e->request);
1.21 markus 723:
1.88 markus 724: /* check wheter agent is locked */
725: if (locked && type != SSH_AGENTC_UNLOCK) {
726: buffer_clear(&e->request);
727: switch (type) {
728: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
729: case SSH2_AGENTC_REQUEST_IDENTITIES:
730: /* send empty lists */
731: no_identities(e, type);
732: break;
733: default:
734: /* send a fail message for all other request types */
735: buffer_put_int(&e->output, 1);
736: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
737: }
738: return;
739: }
740:
1.59 markus 741: debug("type %d", type);
1.21 markus 742: switch (type) {
1.88 markus 743: case SSH_AGENTC_LOCK:
744: case SSH_AGENTC_UNLOCK:
745: process_lock_agent(e, type == SSH_AGENTC_LOCK);
746: break;
1.33 markus 747: /* ssh1 */
748: case SSH_AGENTC_RSA_CHALLENGE:
749: process_authentication_challenge1(e);
750: break;
1.21 markus 751: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 752: process_request_identities(e, 1);
1.21 markus 753: break;
754: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 755: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 756: process_add_identity(e, 1);
1.21 markus 757: break;
758: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 759: process_remove_identity(e, 1);
1.21 markus 760: break;
761: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 762: process_remove_all_identities(e, 1);
763: break;
764: /* ssh2 */
765: case SSH2_AGENTC_SIGN_REQUEST:
766: process_sign_request2(e);
767: break;
768: case SSH2_AGENTC_REQUEST_IDENTITIES:
769: process_request_identities(e, 2);
770: break;
771: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 772: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 773: process_add_identity(e, 2);
774: break;
775: case SSH2_AGENTC_REMOVE_IDENTITY:
776: process_remove_identity(e, 2);
777: break;
778: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
779: process_remove_all_identities(e, 2);
1.21 markus 780: break;
1.163 markus 781: #ifdef ENABLE_PKCS11
1.59 markus 782: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 783: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 784: process_add_smartcard_key(e);
1.75 deraadt 785: break;
1.59 markus 786: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
787: process_remove_smartcard_key(e);
1.75 deraadt 788: break;
1.163 markus 789: #endif /* ENABLE_PKCS11 */
1.21 markus 790: default:
791: /* Unknown message. Respond with failure. */
792: error("Unknown message %d", type);
1.87 markus 793: buffer_clear(&e->request);
1.21 markus 794: buffer_put_int(&e->output, 1);
795: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
796: break;
797: }
1.1 deraadt 798: }
799:
1.55 itojun 800: static void
1.73 stevesk 801: new_socket(sock_type type, int fd)
1.1 deraadt 802: {
1.112 markus 803: u_int i, old_alloc, new_alloc;
1.96 deraadt 804:
1.119 djm 805: set_nonblock(fd);
1.21 markus 806:
807: if (fd > max_fd)
808: max_fd = fd;
809:
810: for (i = 0; i < sockets_alloc; i++)
811: if (sockets[i].type == AUTH_UNUSED) {
812: sockets[i].fd = fd;
813: buffer_init(&sockets[i].input);
814: buffer_init(&sockets[i].output);
1.87 markus 815: buffer_init(&sockets[i].request);
1.112 markus 816: sockets[i].type = type;
1.21 markus 817: return;
818: }
819: old_alloc = sockets_alloc;
1.112 markus 820: new_alloc = sockets_alloc + 10;
1.133 djm 821: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 822: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 823: sockets[i].type = AUTH_UNUSED;
1.112 markus 824: sockets_alloc = new_alloc;
1.21 markus 825: sockets[old_alloc].fd = fd;
826: buffer_init(&sockets[old_alloc].input);
827: buffer_init(&sockets[old_alloc].output);
1.87 markus 828: buffer_init(&sockets[old_alloc].request);
1.112 markus 829: sockets[old_alloc].type = type;
1.1 deraadt 830: }
831:
1.55 itojun 832: static int
1.155 dtucker 833: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
834: struct timeval **tvpp)
1.1 deraadt 835: {
1.155 dtucker 836: u_int i, sz, deadline;
1.46 markus 837: int n = 0;
1.155 dtucker 838: static struct timeval tv;
1.46 markus 839:
840: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 841: switch (sockets[i].type) {
842: case AUTH_SOCKET:
843: case AUTH_CONNECTION:
1.46 markus 844: n = MAX(n, sockets[i].fd);
1.21 markus 845: break;
846: case AUTH_UNUSED:
847: break;
848: default:
849: fatal("Unknown socket type %d", sockets[i].type);
850: break;
851: }
1.46 markus 852: }
853:
854: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 855: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 856: if (*fdrp)
1.54 stevesk 857: xfree(*fdrp);
1.46 markus 858: if (*fdwp)
1.54 stevesk 859: xfree(*fdwp);
1.46 markus 860: *fdrp = xmalloc(sz);
861: *fdwp = xmalloc(sz);
1.66 markus 862: *nallocp = sz;
1.46 markus 863: }
1.66 markus 864: if (n < *fdl)
865: debug("XXX shrink: %d < %d", n, *fdl);
866: *fdl = n;
1.46 markus 867: memset(*fdrp, 0, sz);
868: memset(*fdwp, 0, sz);
869:
870: for (i = 0; i < sockets_alloc; i++) {
871: switch (sockets[i].type) {
872: case AUTH_SOCKET:
873: case AUTH_CONNECTION:
874: FD_SET(sockets[i].fd, *fdrp);
875: if (buffer_len(&sockets[i].output) > 0)
876: FD_SET(sockets[i].fd, *fdwp);
877: break;
878: default:
879: break;
880: }
881: }
1.155 dtucker 882: deadline = reaper();
883: if (parent_alive_interval != 0)
884: deadline = (deadline == 0) ? parent_alive_interval :
885: MIN(deadline, parent_alive_interval);
886: if (deadline == 0) {
887: *tvpp = NULL;
888: } else {
889: tv.tv_sec = deadline;
890: tv.tv_usec = 0;
891: *tvpp = &tv;
892: }
1.46 markus 893: return (1);
1.21 markus 894: }
895:
1.55 itojun 896: static void
1.21 markus 897: after_select(fd_set *readset, fd_set *writeset)
898: {
1.96 deraadt 899: struct sockaddr_un sunaddr;
1.26 markus 900: socklen_t slen;
1.21 markus 901: char buf[1024];
1.96 deraadt 902: int len, sock;
1.162 djm 903: u_int i, orig_alloc;
1.103 markus 904: uid_t euid;
905: gid_t egid;
1.21 markus 906:
1.162 djm 907: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 908: switch (sockets[i].type) {
909: case AUTH_UNUSED:
910: break;
911: case AUTH_SOCKET:
912: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 913: slen = sizeof(sunaddr);
1.46 markus 914: sock = accept(sockets[i].fd,
1.131 deraadt 915: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 916: if (sock < 0) {
1.81 stevesk 917: error("accept from AUTH_SOCKET: %s",
918: strerror(errno));
1.103 markus 919: break;
920: }
921: if (getpeereid(sock, &euid, &egid) < 0) {
922: error("getpeereid %d failed: %s",
923: sock, strerror(errno));
924: close(sock);
925: break;
926: }
1.105 markus 927: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 928: error("uid mismatch: "
1.104 stevesk 929: "peer euid %u != uid %u",
930: (u_int) euid, (u_int) getuid());
1.103 markus 931: close(sock);
1.21 markus 932: break;
933: }
934: new_socket(AUTH_CONNECTION, sock);
935: }
936: break;
937: case AUTH_CONNECTION:
938: if (buffer_len(&sockets[i].output) > 0 &&
939: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 940: len = write(sockets[i].fd,
941: buffer_ptr(&sockets[i].output),
942: buffer_len(&sockets[i].output));
943: if (len == -1 && (errno == EAGAIN ||
944: errno == EINTR))
945: continue;
1.21 markus 946: if (len <= 0) {
1.101 stevesk 947: close_socket(&sockets[i]);
1.21 markus 948: break;
949: }
950: buffer_consume(&sockets[i].output, len);
951: }
952: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 953: len = read(sockets[i].fd, buf, sizeof(buf));
954: if (len == -1 && (errno == EAGAIN ||
955: errno == EINTR))
956: continue;
1.21 markus 957: if (len <= 0) {
1.101 stevesk 958: close_socket(&sockets[i]);
1.21 markus 959: break;
960: }
961: buffer_append(&sockets[i].input, buf, len);
962: process_message(&sockets[i]);
963: }
964: break;
965: default:
966: fatal("Unknown type %d", sockets[i].type);
967: }
1.1 deraadt 968: }
969:
1.55 itojun 970: static void
1.113 markus 971: cleanup_socket(void)
1.15 markus 972: {
1.48 deraadt 973: if (socket_name[0])
974: unlink(socket_name);
975: if (socket_dir[0])
976: rmdir(socket_dir);
1.10 markus 977: }
978:
1.114 markus 979: void
1.15 markus 980: cleanup_exit(int i)
981: {
1.113 markus 982: cleanup_socket();
983: _exit(i);
1.15 markus 984: }
985:
1.135 deraadt 986: /*ARGSUSED*/
1.55 itojun 987: static void
1.48 deraadt 988: cleanup_handler(int sig)
989: {
1.113 markus 990: cleanup_socket();
1.163 markus 991: #ifdef ENABLE_PKCS11
992: pkcs11_terminate();
993: #endif
1.48 deraadt 994: _exit(2);
1.113 markus 995: }
996:
1.68 markus 997: static void
1.155 dtucker 998: check_parent_exists(void)
1.68 markus 999: {
1000: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
1001: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1002: cleanup_socket();
1003: _exit(2);
1.68 markus 1004: }
1.48 deraadt 1005: }
1006:
1.55 itojun 1007: static void
1.50 itojun 1008: usage(void)
1.15 markus 1009: {
1.156 sobrado 1010: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1011: __progname);
1.72 jakob 1012: fprintf(stderr, "Options:\n");
1013: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1014: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1015: fprintf(stderr, " -k Kill the current agent.\n");
1016: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1017: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1018: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1019: exit(1);
1.15 markus 1020: }
1021:
1.2 provos 1022: int
1023: main(int ac, char **av)
1.1 deraadt 1024: {
1.107 markus 1025: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1026: int sock, fd, ch, result, saved_errno;
1.120 avsm 1027: u_int nalloc;
1.96 deraadt 1028: char *shell, *format, *pidstr, *agentsocket = NULL;
1029: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1030: struct sockaddr_un sunaddr;
1.41 markus 1031: struct rlimit rlim;
1.96 deraadt 1032: extern int optind;
1.98 stevesk 1033: extern char *optarg;
1.21 markus 1034: pid_t pid;
1.96 deraadt 1035: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1036: struct timeval *tvp = NULL;
1.161 tobias 1037: size_t len;
1.123 djm 1038:
1039: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1040: sanitise_stdfd();
1.99 markus 1041:
1042: /* drop */
1043: setegid(getgid());
1044: setgid(getgid());
1.53 markus 1045:
1046: SSLeay_add_all_algorithms();
1.21 markus 1047:
1.106 marc 1048: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1049: switch (ch) {
1050: case 'c':
1051: if (s_flag)
1052: usage();
1053: c_flag++;
1054: break;
1055: case 'k':
1056: k_flag++;
1057: break;
1058: case 's':
1059: if (c_flag)
1060: usage();
1061: s_flag++;
1062: break;
1.57 markus 1063: case 'd':
1064: if (d_flag)
1065: usage();
1066: d_flag++;
1067: break;
1.86 markus 1068: case 'a':
1069: agentsocket = optarg;
1.106 marc 1070: break;
1071: case 't':
1072: if ((lifetime = convtime(optarg)) == -1) {
1073: fprintf(stderr, "Invalid lifetime\n");
1074: usage();
1075: }
1.86 markus 1076: break;
1.21 markus 1077: default:
1078: usage();
1079: }
1080: }
1081: ac -= optind;
1082: av += optind;
1083:
1.57 markus 1084: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1085: usage();
1086:
1.85 markus 1087: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1088: shell = getenv("SHELL");
1.161 tobias 1089: if (shell != NULL && (len = strlen(shell)) > 2 &&
1090: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1091: c_flag = 1;
1092: }
1093: if (k_flag) {
1.136 deraadt 1094: const char *errstr = NULL;
1095:
1.21 markus 1096: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1097: if (pidstr == NULL) {
1098: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1099: SSH_AGENTPID_ENV_NAME);
1.21 markus 1100: exit(1);
1101: }
1.136 deraadt 1102: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1103: if (errstr) {
1104: fprintf(stderr,
1105: "%s=\"%s\", which is not a good PID: %s\n",
1106: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1107: exit(1);
1108: }
1109: if (kill(pid, SIGTERM) == -1) {
1110: perror("kill");
1111: exit(1);
1112: }
1113: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1114: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1115: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1116: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1117: exit(0);
1118: }
1119: parent_pid = getpid();
1120:
1.86 markus 1121: if (agentsocket == NULL) {
1122: /* Create private directory for agent socket */
1.115 markus 1123: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1124: if (mkdtemp(socket_dir) == NULL) {
1125: perror("mkdtemp: private socket dir");
1126: exit(1);
1127: }
1.91 mpech 1128: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1129: (long)parent_pid);
1.86 markus 1130: } else {
1131: /* Try to use specified agent socket */
1132: socket_dir[0] = '\0';
1133: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1134: }
1135:
1.23 markus 1136: /*
1137: * Create socket early so it will exist before command gets run from
1138: * the parent.
1139: */
1.21 markus 1140: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1141: if (sock < 0) {
1142: perror("socket");
1.121 djm 1143: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1144: cleanup_exit(1);
1145: }
1146: memset(&sunaddr, 0, sizeof(sunaddr));
1147: sunaddr.sun_family = AF_UNIX;
1148: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1149: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1150: perror("bind");
1.121 djm 1151: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1152: cleanup_exit(1);
1153: }
1.117 markus 1154: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1155: perror("listen");
1156: cleanup_exit(1);
1157: }
1.46 markus 1158:
1.23 markus 1159: /*
1160: * Fork, and have the parent execute the command, if any, or present
1161: * the socket data. The child continues as the authentication agent.
1162: */
1.57 markus 1163: if (d_flag) {
1164: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1165: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1166: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1167: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1168: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1169: goto skip;
1170: }
1.21 markus 1171: pid = fork();
1172: if (pid == -1) {
1173: perror("fork");
1.81 stevesk 1174: cleanup_exit(1);
1.21 markus 1175: }
1176: if (pid != 0) { /* Parent - execute the given command. */
1177: close(sock);
1.91 mpech 1178: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1179: if (ac == 0) {
1180: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1181: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1182: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1183: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1184: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1185: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1186: exit(0);
1187: }
1.36 deraadt 1188: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1189: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1190: perror("setenv");
1191: exit(1);
1192: }
1.21 markus 1193: execvp(av[0], av);
1194: perror(av[0]);
1195: exit(1);
1196: }
1.81 stevesk 1197: /* child */
1198: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1199:
1200: if (setsid() == -1) {
1.81 stevesk 1201: error("setsid: %s", strerror(errno));
1.67 stevesk 1202: cleanup_exit(1);
1203: }
1204:
1205: (void)chdir("/");
1.107 markus 1206: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1207: /* XXX might close listen socket */
1208: (void)dup2(fd, STDIN_FILENO);
1209: (void)dup2(fd, STDOUT_FILENO);
1210: (void)dup2(fd, STDERR_FILENO);
1211: if (fd > 2)
1212: close(fd);
1213: }
1.21 markus 1214:
1.41 markus 1215: /* deny core dumps, since memory contains unencrypted private keys */
1216: rlim.rlim_cur = rlim.rlim_max = 0;
1217: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1218: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1219: cleanup_exit(1);
1220: }
1.57 markus 1221:
1222: skip:
1.163 markus 1223:
1224: #ifdef ENABLE_PKCS11
1225: pkcs11_init(0);
1226: #endif
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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