Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.167
1.167 ! tedu 1: /* $OpenBSD: ssh-agent.c,v 1.166 2010/04/16 01:47:26 djm 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;
1.165 djm 457: u_char *cert;
458: u_int len;
1.33 markus 459:
460: switch (version) {
461: case 1:
1.39 markus 462: k = key_new_private(KEY_RSA1);
1.97 markus 463: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 464: buffer_get_bignum(&e->request, k->rsa->n);
465: buffer_get_bignum(&e->request, k->rsa->e);
466: buffer_get_bignum(&e->request, k->rsa->d);
467: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 468:
469: /* SSH and SSL have p and q swapped */
1.87 markus 470: buffer_get_bignum(&e->request, k->rsa->q); /* p */
471: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 472:
473: /* Generate additional parameters */
1.60 markus 474: rsa_generate_additional_parameters(k->rsa);
1.33 markus 475: break;
476: case 2:
1.87 markus 477: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 478: type = key_type_from_name(type_name);
1.39 markus 479: xfree(type_name);
1.74 deraadt 480: switch (type) {
1.39 markus 481: case KEY_DSA:
482: k = key_new_private(type);
1.87 markus 483: buffer_get_bignum2(&e->request, k->dsa->p);
484: buffer_get_bignum2(&e->request, k->dsa->q);
485: buffer_get_bignum2(&e->request, k->dsa->g);
486: buffer_get_bignum2(&e->request, k->dsa->pub_key);
487: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 488: break;
1.166 djm 489: case KEY_DSA_CERT_V00:
1.165 djm 490: case KEY_DSA_CERT:
491: cert = buffer_get_string(&e->request, &len);
492: if ((k = key_from_blob(cert, len)) == NULL)
493: fatal("Certificate parse failed");
494: xfree(cert);
495: key_add_private(k);
496: buffer_get_bignum2(&e->request, k->dsa->priv_key);
497: break;
1.39 markus 498: case KEY_RSA:
499: k = key_new_private(type);
1.87 markus 500: buffer_get_bignum2(&e->request, k->rsa->n);
501: buffer_get_bignum2(&e->request, k->rsa->e);
502: buffer_get_bignum2(&e->request, k->rsa->d);
503: buffer_get_bignum2(&e->request, k->rsa->iqmp);
504: buffer_get_bignum2(&e->request, k->rsa->p);
505: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 506:
507: /* Generate additional parameters */
1.60 markus 508: rsa_generate_additional_parameters(k->rsa);
1.39 markus 509: break;
1.166 djm 510: case KEY_RSA_CERT_V00:
1.165 djm 511: case KEY_RSA_CERT:
512: cert = buffer_get_string(&e->request, &len);
513: if ((k = key_from_blob(cert, len)) == NULL)
514: fatal("Certificate parse failed");
515: xfree(cert);
516: key_add_private(k);
517: buffer_get_bignum2(&e->request, k->rsa->d);
518: buffer_get_bignum2(&e->request, k->rsa->iqmp);
519: buffer_get_bignum2(&e->request, k->rsa->p);
520: buffer_get_bignum2(&e->request, k->rsa->q);
521: break;
1.39 markus 522: default:
1.87 markus 523: buffer_clear(&e->request);
1.108 markus 524: goto send;
525: }
526: break;
527: }
528: /* enable blinding */
529: switch (k->type) {
530: case KEY_RSA:
1.166 djm 531: case KEY_RSA_CERT_V00:
1.165 djm 532: case KEY_RSA_CERT:
1.108 markus 533: case KEY_RSA1:
534: if (RSA_blinding_on(k->rsa, NULL) != 1) {
535: error("process_add_identity: RSA_blinding_on failed");
536: key_free(k);
1.33 markus 537: goto send;
1.21 markus 538: }
1.33 markus 539: break;
540: }
1.87 markus 541: comment = buffer_get_string(&e->request, NULL);
1.33 markus 542: if (k == NULL) {
543: xfree(comment);
544: goto send;
545: }
1.94 markus 546: while (buffer_len(&e->request)) {
1.158 djm 547: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 548: case SSH_AGENT_CONSTRAIN_LIFETIME:
549: death = time(NULL) + buffer_get_int(&e->request);
550: break;
1.107 markus 551: case SSH_AGENT_CONSTRAIN_CONFIRM:
552: confirm = 1;
553: break;
1.94 markus 554: default:
1.158 djm 555: error("process_add_identity: "
556: "Unknown constraint type %d", type);
557: xfree(comment);
558: key_free(k);
559: goto send;
1.94 markus 560: }
561: }
1.158 djm 562: success = 1;
1.106 marc 563: if (lifetime && !death)
564: death = time(NULL) + lifetime;
1.157 canacar 565: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 566: id = xcalloc(1, sizeof(Identity));
1.78 provos 567: id->key = k;
568: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 569: /* Increment the number of identities. */
570: tab->nentries++;
571: } else {
572: key_free(k);
1.157 canacar 573: xfree(id->comment);
1.33 markus 574: }
1.157 canacar 575: id->comment = comment;
576: id->death = death;
577: id->confirm = confirm;
1.33 markus 578: send:
1.1 deraadt 579: buffer_put_int(&e->output, 1);
1.33 markus 580: buffer_put_char(&e->output,
581: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 582: }
583:
1.88 markus 584: /* XXX todo: encrypt sensitive data with passphrase */
585: static void
586: process_lock_agent(SocketEntry *e, int lock)
587: {
1.96 deraadt 588: int success = 0;
1.88 markus 589: char *passwd;
590:
591: passwd = buffer_get_string(&e->request, NULL);
592: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
593: locked = 0;
594: memset(lock_passwd, 0, strlen(lock_passwd));
595: xfree(lock_passwd);
596: lock_passwd = NULL;
597: success = 1;
598: } else if (!locked && lock) {
599: locked = 1;
600: lock_passwd = xstrdup(passwd);
601: success = 1;
602: }
603: memset(passwd, 0, strlen(passwd));
604: xfree(passwd);
1.95 deraadt 605:
1.88 markus 606: buffer_put_int(&e->output, 1);
607: buffer_put_char(&e->output,
608: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
609: }
610:
611: static void
612: no_identities(SocketEntry *e, u_int type)
613: {
614: Buffer msg;
615:
616: buffer_init(&msg);
617: buffer_put_char(&msg,
618: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
619: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
620: buffer_put_int(&msg, 0);
621: buffer_put_int(&e->output, buffer_len(&msg));
622: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
623: buffer_free(&msg);
624: }
1.59 markus 625:
1.163 markus 626: #ifdef ENABLE_PKCS11
1.59 markus 627: static void
1.158 djm 628: process_add_smartcard_key(SocketEntry *e)
1.59 markus 629: {
1.163 markus 630: char *provider = NULL, *pin;
631: int i, type, version, count = 0, success = 0, death = 0, confirm = 0;
632: Key **keys = NULL, *k;
1.84 markus 633: Identity *id;
1.59 markus 634: Idtab *tab;
1.75 deraadt 635:
1.163 markus 636: provider = buffer_get_string(&e->request, NULL);
1.87 markus 637: pin = buffer_get_string(&e->request, NULL);
1.110 djm 638:
639: while (buffer_len(&e->request)) {
1.158 djm 640: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 641: case SSH_AGENT_CONSTRAIN_LIFETIME:
642: death = time(NULL) + buffer_get_int(&e->request);
643: break;
644: case SSH_AGENT_CONSTRAIN_CONFIRM:
645: confirm = 1;
646: break;
647: default:
1.158 djm 648: error("process_add_smartcard_key: "
649: "Unknown constraint type %d", type);
650: goto send;
1.110 djm 651: }
652: }
653: if (lifetime && !death)
654: death = time(NULL) + lifetime;
655:
1.163 markus 656: count = pkcs11_add_provider(provider, pin, &keys);
657: for (i = 0; i < count; i++) {
1.84 markus 658: k = keys[i];
659: version = k->type == KEY_RSA1 ? 1 : 2;
660: tab = idtab_lookup(version);
661: if (lookup_identity(k, version) == NULL) {
1.163 markus 662: id = xcalloc(1, sizeof(Identity));
1.84 markus 663: id->key = k;
1.163 markus 664: id->provider = xstrdup(provider);
665: id->comment = xstrdup(provider); /* XXX */
1.110 djm 666: id->death = death;
667: id->confirm = confirm;
1.84 markus 668: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
669: tab->nentries++;
670: success = 1;
671: } else {
672: key_free(k);
673: }
674: keys[i] = NULL;
1.59 markus 675: }
676: send:
1.163 markus 677: if (pin)
678: xfree(pin);
679: if (provider)
680: xfree(provider);
681: if (keys)
682: xfree(keys);
1.59 markus 683: buffer_put_int(&e->output, 1);
684: buffer_put_char(&e->output,
685: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
686: }
687:
688: static void
689: process_remove_smartcard_key(SocketEntry *e)
690: {
1.163 markus 691: char *provider = NULL, *pin = NULL;
692: int version, success = 0;
693: Identity *id, *nxt;
1.84 markus 694: Idtab *tab;
1.59 markus 695:
1.163 markus 696: provider = buffer_get_string(&e->request, NULL);
1.87 markus 697: pin = buffer_get_string(&e->request, NULL);
1.83 rees 698: xfree(pin);
1.59 markus 699:
1.163 markus 700: for (version = 1; version < 3; version++) {
701: tab = idtab_lookup(version);
702: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
703: nxt = TAILQ_NEXT(id, next);
704: if (!strcmp(provider, id->provider)) {
705: TAILQ_REMOVE(&tab->idlist, id, next);
706: free_identity(id);
707: tab->nentries--;
708: }
1.59 markus 709: }
710: }
1.163 markus 711: if (pkcs11_del_provider(provider) == 0)
712: success = 1;
713: else
714: error("process_remove_smartcard_key:"
715: " pkcs11_del_provider failed");
716: xfree(provider);
1.59 markus 717: buffer_put_int(&e->output, 1);
718: buffer_put_char(&e->output,
719: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
720: }
1.163 markus 721: #endif /* ENABLE_PKCS11 */
1.59 markus 722:
1.33 markus 723: /* dispatch incoming messages */
724:
1.55 itojun 725: static void
1.2 provos 726: process_message(SocketEntry *e)
1.1 deraadt 727: {
1.96 deraadt 728: u_int msg_len, type;
1.45 markus 729: u_char *cp;
1.89 markus 730:
1.21 markus 731: if (buffer_len(&e->input) < 5)
732: return; /* Incomplete message. */
1.77 stevesk 733: cp = buffer_ptr(&e->input);
1.137 djm 734: msg_len = get_u32(cp);
1.21 markus 735: if (msg_len > 256 * 1024) {
1.101 stevesk 736: close_socket(e);
1.21 markus 737: return;
738: }
739: if (buffer_len(&e->input) < msg_len + 4)
740: return;
1.87 markus 741:
742: /* move the current input to e->request */
1.21 markus 743: buffer_consume(&e->input, 4);
1.87 markus 744: buffer_clear(&e->request);
745: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
746: buffer_consume(&e->input, msg_len);
747: type = buffer_get_char(&e->request);
1.21 markus 748:
1.88 markus 749: /* check wheter agent is locked */
750: if (locked && type != SSH_AGENTC_UNLOCK) {
751: buffer_clear(&e->request);
752: switch (type) {
753: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
754: case SSH2_AGENTC_REQUEST_IDENTITIES:
755: /* send empty lists */
756: no_identities(e, type);
757: break;
758: default:
759: /* send a fail message for all other request types */
760: buffer_put_int(&e->output, 1);
761: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
762: }
763: return;
764: }
765:
1.59 markus 766: debug("type %d", type);
1.21 markus 767: switch (type) {
1.88 markus 768: case SSH_AGENTC_LOCK:
769: case SSH_AGENTC_UNLOCK:
770: process_lock_agent(e, type == SSH_AGENTC_LOCK);
771: break;
1.33 markus 772: /* ssh1 */
773: case SSH_AGENTC_RSA_CHALLENGE:
774: process_authentication_challenge1(e);
775: break;
1.21 markus 776: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 777: process_request_identities(e, 1);
1.21 markus 778: break;
779: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 780: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 781: process_add_identity(e, 1);
1.21 markus 782: break;
783: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 784: process_remove_identity(e, 1);
1.21 markus 785: break;
786: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 787: process_remove_all_identities(e, 1);
788: break;
789: /* ssh2 */
790: case SSH2_AGENTC_SIGN_REQUEST:
791: process_sign_request2(e);
792: break;
793: case SSH2_AGENTC_REQUEST_IDENTITIES:
794: process_request_identities(e, 2);
795: break;
796: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 797: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 798: process_add_identity(e, 2);
799: break;
800: case SSH2_AGENTC_REMOVE_IDENTITY:
801: process_remove_identity(e, 2);
802: break;
803: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
804: process_remove_all_identities(e, 2);
1.21 markus 805: break;
1.163 markus 806: #ifdef ENABLE_PKCS11
1.59 markus 807: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 808: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 809: process_add_smartcard_key(e);
1.75 deraadt 810: break;
1.59 markus 811: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
812: process_remove_smartcard_key(e);
1.75 deraadt 813: break;
1.163 markus 814: #endif /* ENABLE_PKCS11 */
1.21 markus 815: default:
816: /* Unknown message. Respond with failure. */
817: error("Unknown message %d", type);
1.87 markus 818: buffer_clear(&e->request);
1.21 markus 819: buffer_put_int(&e->output, 1);
820: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
821: break;
822: }
1.1 deraadt 823: }
824:
1.55 itojun 825: static void
1.73 stevesk 826: new_socket(sock_type type, int fd)
1.1 deraadt 827: {
1.112 markus 828: u_int i, old_alloc, new_alloc;
1.96 deraadt 829:
1.119 djm 830: set_nonblock(fd);
1.21 markus 831:
832: if (fd > max_fd)
833: max_fd = fd;
834:
835: for (i = 0; i < sockets_alloc; i++)
836: if (sockets[i].type == AUTH_UNUSED) {
837: sockets[i].fd = fd;
838: buffer_init(&sockets[i].input);
839: buffer_init(&sockets[i].output);
1.87 markus 840: buffer_init(&sockets[i].request);
1.112 markus 841: sockets[i].type = type;
1.21 markus 842: return;
843: }
844: old_alloc = sockets_alloc;
1.112 markus 845: new_alloc = sockets_alloc + 10;
1.133 djm 846: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 847: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 848: sockets[i].type = AUTH_UNUSED;
1.112 markus 849: sockets_alloc = new_alloc;
1.21 markus 850: sockets[old_alloc].fd = fd;
851: buffer_init(&sockets[old_alloc].input);
852: buffer_init(&sockets[old_alloc].output);
1.87 markus 853: buffer_init(&sockets[old_alloc].request);
1.112 markus 854: sockets[old_alloc].type = type;
1.1 deraadt 855: }
856:
1.55 itojun 857: static int
1.155 dtucker 858: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
859: struct timeval **tvpp)
1.1 deraadt 860: {
1.155 dtucker 861: u_int i, sz, deadline;
1.46 markus 862: int n = 0;
1.155 dtucker 863: static struct timeval tv;
1.46 markus 864:
865: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 866: switch (sockets[i].type) {
867: case AUTH_SOCKET:
868: case AUTH_CONNECTION:
1.46 markus 869: n = MAX(n, sockets[i].fd);
1.21 markus 870: break;
871: case AUTH_UNUSED:
872: break;
873: default:
874: fatal("Unknown socket type %d", sockets[i].type);
875: break;
876: }
1.46 markus 877: }
878:
879: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 880: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 881: if (*fdrp)
1.54 stevesk 882: xfree(*fdrp);
1.46 markus 883: if (*fdwp)
1.54 stevesk 884: xfree(*fdwp);
1.46 markus 885: *fdrp = xmalloc(sz);
886: *fdwp = xmalloc(sz);
1.66 markus 887: *nallocp = sz;
1.46 markus 888: }
1.66 markus 889: if (n < *fdl)
890: debug("XXX shrink: %d < %d", n, *fdl);
891: *fdl = n;
1.46 markus 892: memset(*fdrp, 0, sz);
893: memset(*fdwp, 0, sz);
894:
895: for (i = 0; i < sockets_alloc; i++) {
896: switch (sockets[i].type) {
897: case AUTH_SOCKET:
898: case AUTH_CONNECTION:
899: FD_SET(sockets[i].fd, *fdrp);
900: if (buffer_len(&sockets[i].output) > 0)
901: FD_SET(sockets[i].fd, *fdwp);
902: break;
903: default:
904: break;
905: }
906: }
1.155 dtucker 907: deadline = reaper();
908: if (parent_alive_interval != 0)
909: deadline = (deadline == 0) ? parent_alive_interval :
910: MIN(deadline, parent_alive_interval);
911: if (deadline == 0) {
912: *tvpp = NULL;
913: } else {
914: tv.tv_sec = deadline;
915: tv.tv_usec = 0;
916: *tvpp = &tv;
917: }
1.46 markus 918: return (1);
1.21 markus 919: }
920:
1.55 itojun 921: static void
1.21 markus 922: after_select(fd_set *readset, fd_set *writeset)
923: {
1.96 deraadt 924: struct sockaddr_un sunaddr;
1.26 markus 925: socklen_t slen;
1.21 markus 926: char buf[1024];
1.96 deraadt 927: int len, sock;
1.162 djm 928: u_int i, orig_alloc;
1.103 markus 929: uid_t euid;
930: gid_t egid;
1.21 markus 931:
1.162 djm 932: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 933: switch (sockets[i].type) {
934: case AUTH_UNUSED:
935: break;
936: case AUTH_SOCKET:
937: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 938: slen = sizeof(sunaddr);
1.46 markus 939: sock = accept(sockets[i].fd,
1.131 deraadt 940: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 941: if (sock < 0) {
1.81 stevesk 942: error("accept from AUTH_SOCKET: %s",
943: strerror(errno));
1.103 markus 944: break;
945: }
946: if (getpeereid(sock, &euid, &egid) < 0) {
947: error("getpeereid %d failed: %s",
948: sock, strerror(errno));
949: close(sock);
950: break;
951: }
1.105 markus 952: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 953: error("uid mismatch: "
1.104 stevesk 954: "peer euid %u != uid %u",
955: (u_int) euid, (u_int) getuid());
1.103 markus 956: close(sock);
1.21 markus 957: break;
958: }
959: new_socket(AUTH_CONNECTION, sock);
960: }
961: break;
962: case AUTH_CONNECTION:
963: if (buffer_len(&sockets[i].output) > 0 &&
964: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 965: len = write(sockets[i].fd,
966: buffer_ptr(&sockets[i].output),
967: buffer_len(&sockets[i].output));
968: if (len == -1 && (errno == EAGAIN ||
969: errno == EINTR))
970: continue;
1.21 markus 971: if (len <= 0) {
1.101 stevesk 972: close_socket(&sockets[i]);
1.21 markus 973: break;
974: }
975: buffer_consume(&sockets[i].output, len);
976: }
977: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 978: len = read(sockets[i].fd, buf, sizeof(buf));
979: if (len == -1 && (errno == EAGAIN ||
980: errno == EINTR))
981: continue;
1.21 markus 982: if (len <= 0) {
1.101 stevesk 983: close_socket(&sockets[i]);
1.21 markus 984: break;
985: }
986: buffer_append(&sockets[i].input, buf, len);
987: process_message(&sockets[i]);
988: }
989: break;
990: default:
991: fatal("Unknown type %d", sockets[i].type);
992: }
1.1 deraadt 993: }
994:
1.55 itojun 995: static void
1.113 markus 996: cleanup_socket(void)
1.15 markus 997: {
1.48 deraadt 998: if (socket_name[0])
999: unlink(socket_name);
1000: if (socket_dir[0])
1001: rmdir(socket_dir);
1.10 markus 1002: }
1003:
1.114 markus 1004: void
1.15 markus 1005: cleanup_exit(int i)
1006: {
1.113 markus 1007: cleanup_socket();
1008: _exit(i);
1.15 markus 1009: }
1010:
1.135 deraadt 1011: /*ARGSUSED*/
1.55 itojun 1012: static void
1.48 deraadt 1013: cleanup_handler(int sig)
1014: {
1.113 markus 1015: cleanup_socket();
1.163 markus 1016: #ifdef ENABLE_PKCS11
1017: pkcs11_terminate();
1018: #endif
1.48 deraadt 1019: _exit(2);
1.113 markus 1020: }
1021:
1.68 markus 1022: static void
1.155 dtucker 1023: check_parent_exists(void)
1.68 markus 1024: {
1025: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
1026: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1027: cleanup_socket();
1028: _exit(2);
1.68 markus 1029: }
1.48 deraadt 1030: }
1031:
1.55 itojun 1032: static void
1.50 itojun 1033: usage(void)
1.15 markus 1034: {
1.156 sobrado 1035: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1036: __progname);
1.72 jakob 1037: fprintf(stderr, "Options:\n");
1038: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1039: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1040: fprintf(stderr, " -k Kill the current agent.\n");
1041: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1042: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1043: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1044: exit(1);
1.15 markus 1045: }
1046:
1.2 provos 1047: int
1048: main(int ac, char **av)
1.1 deraadt 1049: {
1.107 markus 1050: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1051: int sock, fd, ch, result, saved_errno;
1.120 avsm 1052: u_int nalloc;
1.96 deraadt 1053: char *shell, *format, *pidstr, *agentsocket = NULL;
1054: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1055: struct sockaddr_un sunaddr;
1.41 markus 1056: struct rlimit rlim;
1.96 deraadt 1057: extern int optind;
1.98 stevesk 1058: extern char *optarg;
1.21 markus 1059: pid_t pid;
1.96 deraadt 1060: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1061: struct timeval *tvp = NULL;
1.161 tobias 1062: size_t len;
1.123 djm 1063:
1064: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1065: sanitise_stdfd();
1.99 markus 1066:
1067: /* drop */
1068: setegid(getgid());
1069: setgid(getgid());
1.53 markus 1070:
1.167 ! tedu 1071: OpenSSL_add_all_algorithms();
1.21 markus 1072:
1.106 marc 1073: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1074: switch (ch) {
1075: case 'c':
1076: if (s_flag)
1077: usage();
1078: c_flag++;
1079: break;
1080: case 'k':
1081: k_flag++;
1082: break;
1083: case 's':
1084: if (c_flag)
1085: usage();
1086: s_flag++;
1087: break;
1.57 markus 1088: case 'd':
1089: if (d_flag)
1090: usage();
1091: d_flag++;
1092: break;
1.86 markus 1093: case 'a':
1094: agentsocket = optarg;
1.106 marc 1095: break;
1096: case 't':
1097: if ((lifetime = convtime(optarg)) == -1) {
1098: fprintf(stderr, "Invalid lifetime\n");
1099: usage();
1100: }
1.86 markus 1101: break;
1.21 markus 1102: default:
1103: usage();
1104: }
1105: }
1106: ac -= optind;
1107: av += optind;
1108:
1.57 markus 1109: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1110: usage();
1111:
1.85 markus 1112: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1113: shell = getenv("SHELL");
1.161 tobias 1114: if (shell != NULL && (len = strlen(shell)) > 2 &&
1115: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1116: c_flag = 1;
1117: }
1118: if (k_flag) {
1.136 deraadt 1119: const char *errstr = NULL;
1120:
1.21 markus 1121: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1122: if (pidstr == NULL) {
1123: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1124: SSH_AGENTPID_ENV_NAME);
1.21 markus 1125: exit(1);
1126: }
1.136 deraadt 1127: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1128: if (errstr) {
1129: fprintf(stderr,
1130: "%s=\"%s\", which is not a good PID: %s\n",
1131: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1132: exit(1);
1133: }
1134: if (kill(pid, SIGTERM) == -1) {
1135: perror("kill");
1136: exit(1);
1137: }
1138: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1139: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1140: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1141: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1142: exit(0);
1143: }
1144: parent_pid = getpid();
1145:
1.86 markus 1146: if (agentsocket == NULL) {
1147: /* Create private directory for agent socket */
1.115 markus 1148: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", sizeof socket_dir);
1.86 markus 1149: if (mkdtemp(socket_dir) == NULL) {
1150: perror("mkdtemp: private socket dir");
1151: exit(1);
1152: }
1.91 mpech 1153: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1154: (long)parent_pid);
1.86 markus 1155: } else {
1156: /* Try to use specified agent socket */
1157: socket_dir[0] = '\0';
1158: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1159: }
1160:
1.23 markus 1161: /*
1162: * Create socket early so it will exist before command gets run from
1163: * the parent.
1164: */
1.21 markus 1165: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1166: if (sock < 0) {
1167: perror("socket");
1.121 djm 1168: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1169: cleanup_exit(1);
1170: }
1171: memset(&sunaddr, 0, sizeof(sunaddr));
1172: sunaddr.sun_family = AF_UNIX;
1173: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1174: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1175: perror("bind");
1.121 djm 1176: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1177: cleanup_exit(1);
1178: }
1.117 markus 1179: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1180: perror("listen");
1181: cleanup_exit(1);
1182: }
1.46 markus 1183:
1.23 markus 1184: /*
1185: * Fork, and have the parent execute the command, if any, or present
1186: * the socket data. The child continues as the authentication agent.
1187: */
1.57 markus 1188: if (d_flag) {
1189: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1190: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1191: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1192: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1193: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1194: goto skip;
1195: }
1.21 markus 1196: pid = fork();
1197: if (pid == -1) {
1198: perror("fork");
1.81 stevesk 1199: cleanup_exit(1);
1.21 markus 1200: }
1201: if (pid != 0) { /* Parent - execute the given command. */
1202: close(sock);
1.91 mpech 1203: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1204: if (ac == 0) {
1205: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1206: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1207: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1208: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1209: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1210: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1211: exit(0);
1212: }
1.36 deraadt 1213: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1214: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1215: perror("setenv");
1216: exit(1);
1217: }
1.21 markus 1218: execvp(av[0], av);
1219: perror(av[0]);
1220: exit(1);
1221: }
1.81 stevesk 1222: /* child */
1223: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1224:
1225: if (setsid() == -1) {
1.81 stevesk 1226: error("setsid: %s", strerror(errno));
1.67 stevesk 1227: cleanup_exit(1);
1228: }
1229:
1230: (void)chdir("/");
1.107 markus 1231: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1232: /* XXX might close listen socket */
1233: (void)dup2(fd, STDIN_FILENO);
1234: (void)dup2(fd, STDOUT_FILENO);
1235: (void)dup2(fd, STDERR_FILENO);
1236: if (fd > 2)
1237: close(fd);
1238: }
1.21 markus 1239:
1.41 markus 1240: /* deny core dumps, since memory contains unencrypted private keys */
1241: rlim.rlim_cur = rlim.rlim_max = 0;
1242: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1243: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1244: cleanup_exit(1);
1245: }
1.57 markus 1246:
1247: skip:
1.163 markus 1248:
1249: #ifdef ENABLE_PKCS11
1250: pkcs11_init(0);
1251: #endif
1.21 markus 1252: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1253: if (ac > 0)
1254: parent_alive_interval = 10;
1.33 markus 1255: idtab_init();
1.61 markus 1256: if (!d_flag)
1.57 markus 1257: signal(SIGINT, SIG_IGN);
1.61 markus 1258: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1259: signal(SIGHUP, cleanup_handler);
1260: signal(SIGTERM, cleanup_handler);
1.66 markus 1261: nalloc = 0;
1262:
1.21 markus 1263: while (1) {
1.155 dtucker 1264: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1265: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1266: saved_errno = errno;
1.155 dtucker 1267: if (parent_alive_interval != 0)
1268: check_parent_exists();
1269: (void) reaper(); /* remove expired keys */
1.154 dtucker 1270: if (result < 0) {
1271: if (saved_errno == EINTR)
1.21 markus 1272: continue;
1.154 dtucker 1273: fatal("select: %s", strerror(saved_errno));
1274: } else if (result > 0)
1275: after_select(readsetp, writesetp);
1.15 markus 1276: }
1.21 markus 1277: /* NOTREACHED */
1.1 deraadt 1278: }
![[BACK]](/icons/back.gif){kind=icon}
Return to ssh-agent.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh