Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.177
1.177 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.176 2013/06/02 13:35:58 dtucker 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;
1.174 dtucker 95: time_t 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;
1.176 dtucker 111: time_t 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:
1.174 dtucker 123: /* Default lifetime in seconds (0 == forever) */
124: static long lifetime = 0;
1.106 marc 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);
1.173 djm 161: free(id->provider);
162: free(id->comment);
163: free(id);
1.89 markus 164: }
165:
1.33 markus 166: /* return matching private key for given public key */
1.78 provos 167: static Identity *
168: lookup_identity(Key *key, int version)
1.33 markus 169: {
1.78 provos 170: Identity *id;
171:
1.33 markus 172: Idtab *tab = idtab_lookup(version);
1.78 provos 173: TAILQ_FOREACH(id, &tab->idlist, next) {
174: if (key_equal(key, id->key))
175: return (id);
1.33 markus 176: }
1.78 provos 177: return (NULL);
178: }
179:
1.107 markus 180: /* Check confirmation of keysign request */
181: static int
182: confirm_key(Identity *id)
183: {
1.122 djm 184: char *p;
1.107 markus 185: int ret = -1;
186:
187: p = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
1.122 djm 188: if (ask_permission("Allow use of key %s?\nKey fingerprint %s.",
189: id->comment, p))
190: ret = 0;
1.173 djm 191: free(p);
1.122 djm 192:
1.107 markus 193: return (ret);
194: }
195:
1.33 markus 196: /* send list of supported public keys to 'client' */
1.55 itojun 197: static void
1.33 markus 198: process_request_identities(SocketEntry *e, int version)
199: {
200: Idtab *tab = idtab_lookup(version);
1.96 deraadt 201: Identity *id;
1.21 markus 202: Buffer msg;
1.1 deraadt 203:
1.21 markus 204: buffer_init(&msg);
1.33 markus 205: buffer_put_char(&msg, (version == 1) ?
206: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
207: buffer_put_int(&msg, tab->nentries);
1.78 provos 208: TAILQ_FOREACH(id, &tab->idlist, next) {
1.39 markus 209: if (id->key->type == KEY_RSA1) {
1.33 markus 210: buffer_put_int(&msg, BN_num_bits(id->key->rsa->n));
211: buffer_put_bignum(&msg, id->key->rsa->e);
212: buffer_put_bignum(&msg, id->key->rsa->n);
213: } else {
1.45 markus 214: u_char *blob;
215: u_int blen;
1.39 markus 216: key_to_blob(id->key, &blob, &blen);
1.33 markus 217: buffer_put_string(&msg, blob, blen);
1.173 djm 218: free(blob);
1.33 markus 219: }
220: buffer_put_cstring(&msg, id->comment);
1.21 markus 221: }
222: buffer_put_int(&e->output, buffer_len(&msg));
223: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
224: buffer_free(&msg);
1.1 deraadt 225: }
226:
1.33 markus 227: /* ssh1 only */
1.55 itojun 228: static void
1.33 markus 229: process_authentication_challenge1(SocketEntry *e)
1.1 deraadt 230: {
1.96 deraadt 231: u_char buf[32], mdbuf[16], session_id[16];
232: u_int response_type;
233: BIGNUM *challenge;
1.78 provos 234: Identity *id;
1.33 markus 235: int i, len;
1.21 markus 236: Buffer msg;
237: MD5_CTX md;
1.96 deraadt 238: Key *key;
1.21 markus 239:
240: buffer_init(&msg);
1.39 markus 241: key = key_new(KEY_RSA1);
1.76 markus 242: if ((challenge = BN_new()) == NULL)
243: fatal("process_authentication_challenge1: BN_new failed");
1.33 markus 244:
1.97 markus 245: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 246: buffer_get_bignum(&e->request, key->rsa->e);
247: buffer_get_bignum(&e->request, key->rsa->n);
248: buffer_get_bignum(&e->request, challenge);
1.21 markus 249:
1.33 markus 250: /* Only protocol 1.1 is supported */
1.87 markus 251: if (buffer_len(&e->request) == 0)
1.33 markus 252: goto failure;
1.87 markus 253: buffer_get(&e->request, session_id, 16);
254: response_type = buffer_get_int(&e->request);
1.33 markus 255: if (response_type != 1)
256: goto failure;
257:
1.78 provos 258: id = lookup_identity(key, 1);
1.107 markus 259: if (id != NULL && (!id->confirm || confirm_key(id) == 0)) {
1.78 provos 260: Key *private = id->key;
1.33 markus 261: /* Decrypt the challenge using the private key. */
1.49 markus 262: if (rsa_private_decrypt(challenge, challenge, private->rsa) <= 0)
263: goto failure;
1.33 markus 264:
265: /* The response is MD5 of decrypted challenge plus session id. */
266: len = BN_num_bytes(challenge);
267: if (len <= 0 || len > 32) {
1.109 itojun 268: logit("process_authentication_challenge: bad challenge length %d", len);
1.33 markus 269: goto failure;
270: }
271: memset(buf, 0, 32);
272: BN_bn2bin(challenge, buf + 32 - len);
273: MD5_Init(&md);
274: MD5_Update(&md, buf, 32);
275: MD5_Update(&md, session_id, 16);
276: MD5_Final(mdbuf, &md);
277:
278: /* Send the response. */
279: buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE);
280: for (i = 0; i < 16; i++)
281: buffer_put_char(&msg, mdbuf[i]);
282: goto send;
283: }
1.21 markus 284:
1.33 markus 285: failure:
286: /* Unknown identity or protocol error. Send failure. */
1.21 markus 287: buffer_put_char(&msg, SSH_AGENT_FAILURE);
288: send:
289: buffer_put_int(&e->output, buffer_len(&msg));
1.33 markus 290: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
291: key_free(key);
292: BN_clear_free(challenge);
293: buffer_free(&msg);
294: }
295:
296: /* ssh2 only */
1.55 itojun 297: static void
1.33 markus 298: process_sign_request2(SocketEntry *e)
299: {
1.45 markus 300: u_char *blob, *data, *signature = NULL;
301: u_int blen, dlen, slen = 0;
1.96 deraadt 302: extern int datafellows;
1.159 djm 303: int odatafellows;
1.96 deraadt 304: int ok = -1, flags;
1.33 markus 305: Buffer msg;
1.96 deraadt 306: Key *key;
1.33 markus 307:
308: datafellows = 0;
1.43 markus 309:
1.87 markus 310: blob = buffer_get_string(&e->request, &blen);
311: data = buffer_get_string(&e->request, &dlen);
1.37 markus 312:
1.87 markus 313: flags = buffer_get_int(&e->request);
1.159 djm 314: odatafellows = datafellows;
1.37 markus 315: if (flags & SSH_AGENT_OLD_SIGNATURE)
316: datafellows = SSH_BUG_SIGBLOB;
1.33 markus 317:
1.39 markus 318: key = key_from_blob(blob, blen);
1.33 markus 319: if (key != NULL) {
1.78 provos 320: Identity *id = lookup_identity(key, 2);
1.107 markus 321: if (id != NULL && (!id->confirm || confirm_key(id) == 0))
1.78 provos 322: ok = key_sign(id->key, &signature, &slen, data, dlen);
1.138 markus 323: key_free(key);
1.33 markus 324: }
325: buffer_init(&msg);
326: if (ok == 0) {
327: buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE);
328: buffer_put_string(&msg, signature, slen);
329: } else {
330: buffer_put_char(&msg, SSH_AGENT_FAILURE);
331: }
332: buffer_put_int(&e->output, buffer_len(&msg));
1.21 markus 333: buffer_append(&e->output, buffer_ptr(&msg),
1.33 markus 334: buffer_len(&msg));
1.21 markus 335: buffer_free(&msg);
1.173 djm 336: free(data);
337: free(blob);
338: free(signature);
1.159 djm 339: datafellows = odatafellows;
1.1 deraadt 340: }
341:
1.33 markus 342: /* shared */
1.55 itojun 343: static void
1.33 markus 344: process_remove_identity(SocketEntry *e, int version)
1.1 deraadt 345: {
1.96 deraadt 346: u_int blen, bits;
347: int success = 0;
1.78 provos 348: Key *key = NULL;
1.45 markus 349: u_char *blob;
1.21 markus 350:
1.74 deraadt 351: switch (version) {
1.33 markus 352: case 1:
1.39 markus 353: key = key_new(KEY_RSA1);
1.87 markus 354: bits = buffer_get_int(&e->request);
355: buffer_get_bignum(&e->request, key->rsa->e);
356: buffer_get_bignum(&e->request, key->rsa->n);
1.33 markus 357:
358: if (bits != key_size(key))
1.109 itojun 359: logit("Warning: identity keysize mismatch: actual %u, announced %u",
1.46 markus 360: key_size(key), bits);
1.33 markus 361: break;
362: case 2:
1.87 markus 363: blob = buffer_get_string(&e->request, &blen);
1.39 markus 364: key = key_from_blob(blob, blen);
1.173 djm 365: free(blob);
1.33 markus 366: break;
367: }
368: if (key != NULL) {
1.78 provos 369: Identity *id = lookup_identity(key, version);
370: if (id != NULL) {
1.23 markus 371: /*
372: * We have this key. Free the old key. Since we
1.124 djm 373: * don't want to leave empty slots in the middle of
1.40 markus 374: * the array, we actually free the key there and move
375: * all the entries between the empty slot and the end
376: * of the array.
1.23 markus 377: */
1.33 markus 378: Idtab *tab = idtab_lookup(version);
1.38 markus 379: if (tab->nentries < 1)
380: fatal("process_remove_identity: "
381: "internal error: tab->nentries %d",
382: tab->nentries);
1.78 provos 383: TAILQ_REMOVE(&tab->idlist, id, next);
384: free_identity(id);
1.33 markus 385: tab->nentries--;
386: success = 1;
1.21 markus 387: }
1.33 markus 388: key_free(key);
389: }
1.1 deraadt 390: buffer_put_int(&e->output, 1);
1.33 markus 391: buffer_put_char(&e->output,
392: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 393: }
394:
1.55 itojun 395: static void
1.33 markus 396: process_remove_all_identities(SocketEntry *e, int version)
1.1 deraadt 397: {
1.33 markus 398: Idtab *tab = idtab_lookup(version);
1.78 provos 399: Identity *id;
1.21 markus 400:
401: /* Loop over all identities and clear the keys. */
1.78 provos 402: for (id = TAILQ_FIRST(&tab->idlist); id;
403: id = TAILQ_FIRST(&tab->idlist)) {
404: TAILQ_REMOVE(&tab->idlist, id, next);
405: free_identity(id);
1.21 markus 406: }
407:
408: /* Mark that there are no identities. */
1.33 markus 409: tab->nentries = 0;
1.21 markus 410:
411: /* Send success. */
412: buffer_put_int(&e->output, 1);
413: buffer_put_char(&e->output, SSH_AGENT_SUCCESS);
1.1 deraadt 414: }
415:
1.155 dtucker 416: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 417: static time_t
1.89 markus 418: reaper(void)
419: {
1.175 dtucker 420: time_t deadline = 0, now = monotime();
1.89 markus 421: Identity *id, *nxt;
422: int version;
1.96 deraadt 423: Idtab *tab;
1.89 markus 424:
425: for (version = 1; version < 3; version++) {
426: tab = idtab_lookup(version);
427: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
428: nxt = TAILQ_NEXT(id, next);
1.155 dtucker 429: if (id->death == 0)
430: continue;
431: if (now >= id->death) {
1.154 dtucker 432: debug("expiring key '%s'", id->comment);
1.89 markus 433: TAILQ_REMOVE(&tab->idlist, id, next);
434: free_identity(id);
435: tab->nentries--;
1.155 dtucker 436: } else
437: deadline = (deadline == 0) ? id->death :
438: MIN(deadline, id->death);
1.89 markus 439: }
440: }
1.155 dtucker 441: if (deadline == 0 || deadline <= now)
442: return 0;
443: else
444: return (deadline - now);
1.89 markus 445: }
446:
447: static void
1.33 markus 448: process_add_identity(SocketEntry *e, int version)
1.1 deraadt 449: {
1.96 deraadt 450: Idtab *tab = idtab_lookup(version);
1.157 canacar 451: Identity *id;
1.174 dtucker 452: int type, success = 0, confirm = 0;
1.169 djm 453: char *type_name, *comment, *curve;
1.174 dtucker 454: time_t death = 0;
1.33 markus 455: Key *k = NULL;
1.169 djm 456: BIGNUM *exponent;
457: EC_POINT *q;
1.165 djm 458: u_char *cert;
459: u_int len;
1.33 markus 460:
461: switch (version) {
462: case 1:
1.39 markus 463: k = key_new_private(KEY_RSA1);
1.97 markus 464: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 465: buffer_get_bignum(&e->request, k->rsa->n);
466: buffer_get_bignum(&e->request, k->rsa->e);
467: buffer_get_bignum(&e->request, k->rsa->d);
468: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 469:
470: /* SSH and SSL have p and q swapped */
1.87 markus 471: buffer_get_bignum(&e->request, k->rsa->q); /* p */
472: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 473:
474: /* Generate additional parameters */
1.60 markus 475: rsa_generate_additional_parameters(k->rsa);
1.33 markus 476: break;
477: case 2:
1.87 markus 478: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 479: type = key_type_from_name(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");
1.173 djm 494: free(cert);
1.165 djm 495: key_add_private(k);
496: buffer_get_bignum2(&e->request, k->dsa->priv_key);
497: break;
1.169 djm 498: case KEY_ECDSA:
499: k = key_new_private(type);
500: k->ecdsa_nid = key_ecdsa_nid_from_name(type_name);
501: curve = buffer_get_string(&e->request, NULL);
502: if (k->ecdsa_nid != key_curve_name_to_nid(curve))
503: fatal("%s: curve names mismatch", __func__);
1.173 djm 504: free(curve);
1.169 djm 505: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
506: if (k->ecdsa == NULL)
507: fatal("%s: EC_KEY_new_by_curve_name failed",
508: __func__);
509: q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa));
510: if (q == NULL)
511: fatal("%s: BN_new failed", __func__);
512: if ((exponent = BN_new()) == NULL)
513: fatal("%s: BN_new failed", __func__);
514: buffer_get_ecpoint(&e->request,
515: EC_KEY_get0_group(k->ecdsa), q);
516: buffer_get_bignum2(&e->request, exponent);
517: if (EC_KEY_set_public_key(k->ecdsa, q) != 1)
518: fatal("%s: EC_KEY_set_public_key failed",
519: __func__);
520: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
521: fatal("%s: EC_KEY_set_private_key failed",
522: __func__);
523: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
524: EC_KEY_get0_public_key(k->ecdsa)) != 0)
525: fatal("%s: bad ECDSA public key", __func__);
526: if (key_ec_validate_private(k->ecdsa) != 0)
527: fatal("%s: bad ECDSA private key", __func__);
528: BN_clear_free(exponent);
529: EC_POINT_free(q);
530: break;
531: case KEY_ECDSA_CERT:
532: cert = buffer_get_string(&e->request, &len);
533: if ((k = key_from_blob(cert, len)) == NULL)
534: fatal("Certificate parse failed");
1.173 djm 535: free(cert);
1.169 djm 536: key_add_private(k);
537: if ((exponent = BN_new()) == NULL)
538: fatal("%s: BN_new failed", __func__);
539: buffer_get_bignum2(&e->request, exponent);
540: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
541: fatal("%s: EC_KEY_set_private_key failed",
542: __func__);
543: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
544: EC_KEY_get0_public_key(k->ecdsa)) != 0 ||
545: key_ec_validate_private(k->ecdsa) != 0)
546: fatal("%s: bad ECDSA key", __func__);
547: BN_clear_free(exponent);
548: break;
1.39 markus 549: case KEY_RSA:
550: k = key_new_private(type);
1.87 markus 551: buffer_get_bignum2(&e->request, k->rsa->n);
552: buffer_get_bignum2(&e->request, k->rsa->e);
553: buffer_get_bignum2(&e->request, k->rsa->d);
554: buffer_get_bignum2(&e->request, k->rsa->iqmp);
555: buffer_get_bignum2(&e->request, k->rsa->p);
556: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 557:
558: /* Generate additional parameters */
1.60 markus 559: rsa_generate_additional_parameters(k->rsa);
1.39 markus 560: break;
1.166 djm 561: case KEY_RSA_CERT_V00:
1.165 djm 562: case KEY_RSA_CERT:
563: cert = buffer_get_string(&e->request, &len);
564: if ((k = key_from_blob(cert, len)) == NULL)
565: fatal("Certificate parse failed");
1.173 djm 566: free(cert);
1.165 djm 567: key_add_private(k);
568: buffer_get_bignum2(&e->request, k->rsa->d);
569: buffer_get_bignum2(&e->request, k->rsa->iqmp);
570: buffer_get_bignum2(&e->request, k->rsa->p);
571: buffer_get_bignum2(&e->request, k->rsa->q);
572: break;
1.39 markus 573: default:
1.173 djm 574: free(type_name);
1.87 markus 575: buffer_clear(&e->request);
1.108 markus 576: goto send;
577: }
1.173 djm 578: free(type_name);
1.108 markus 579: break;
580: }
581: /* enable blinding */
582: switch (k->type) {
583: case KEY_RSA:
1.166 djm 584: case KEY_RSA_CERT_V00:
1.165 djm 585: case KEY_RSA_CERT:
1.108 markus 586: case KEY_RSA1:
587: if (RSA_blinding_on(k->rsa, NULL) != 1) {
588: error("process_add_identity: RSA_blinding_on failed");
589: key_free(k);
1.33 markus 590: goto send;
1.21 markus 591: }
1.33 markus 592: break;
593: }
1.87 markus 594: comment = buffer_get_string(&e->request, NULL);
1.33 markus 595: if (k == NULL) {
1.173 djm 596: free(comment);
1.33 markus 597: goto send;
598: }
1.94 markus 599: while (buffer_len(&e->request)) {
1.158 djm 600: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 601: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 602: death = monotime() + buffer_get_int(&e->request);
1.94 markus 603: break;
1.107 markus 604: case SSH_AGENT_CONSTRAIN_CONFIRM:
605: confirm = 1;
606: break;
1.94 markus 607: default:
1.158 djm 608: error("process_add_identity: "
609: "Unknown constraint type %d", type);
1.173 djm 610: free(comment);
1.158 djm 611: key_free(k);
612: goto send;
1.94 markus 613: }
614: }
1.158 djm 615: success = 1;
1.106 marc 616: if (lifetime && !death)
1.175 dtucker 617: death = monotime() + lifetime;
1.157 canacar 618: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 619: id = xcalloc(1, sizeof(Identity));
1.78 provos 620: id->key = k;
621: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 622: /* Increment the number of identities. */
623: tab->nentries++;
624: } else {
625: key_free(k);
1.173 djm 626: free(id->comment);
1.33 markus 627: }
1.157 canacar 628: id->comment = comment;
629: id->death = death;
630: id->confirm = confirm;
1.33 markus 631: send:
1.1 deraadt 632: buffer_put_int(&e->output, 1);
1.33 markus 633: buffer_put_char(&e->output,
634: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 635: }
636:
1.88 markus 637: /* XXX todo: encrypt sensitive data with passphrase */
638: static void
639: process_lock_agent(SocketEntry *e, int lock)
640: {
1.96 deraadt 641: int success = 0;
1.88 markus 642: char *passwd;
643:
644: passwd = buffer_get_string(&e->request, NULL);
645: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
646: locked = 0;
647: memset(lock_passwd, 0, strlen(lock_passwd));
1.173 djm 648: free(lock_passwd);
1.88 markus 649: lock_passwd = NULL;
650: success = 1;
651: } else if (!locked && lock) {
652: locked = 1;
653: lock_passwd = xstrdup(passwd);
654: success = 1;
655: }
656: memset(passwd, 0, strlen(passwd));
1.173 djm 657: free(passwd);
1.95 deraadt 658:
1.88 markus 659: buffer_put_int(&e->output, 1);
660: buffer_put_char(&e->output,
661: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
662: }
663:
664: static void
665: no_identities(SocketEntry *e, u_int type)
666: {
667: Buffer msg;
668:
669: buffer_init(&msg);
670: buffer_put_char(&msg,
671: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
672: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
673: buffer_put_int(&msg, 0);
674: buffer_put_int(&e->output, buffer_len(&msg));
675: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
676: buffer_free(&msg);
677: }
1.59 markus 678:
1.163 markus 679: #ifdef ENABLE_PKCS11
1.59 markus 680: static void
1.158 djm 681: process_add_smartcard_key(SocketEntry *e)
1.59 markus 682: {
1.163 markus 683: char *provider = NULL, *pin;
1.174 dtucker 684: int i, type, version, count = 0, success = 0, confirm = 0;
685: time_t death = 0;
1.163 markus 686: Key **keys = NULL, *k;
1.84 markus 687: Identity *id;
1.59 markus 688: Idtab *tab;
1.75 deraadt 689:
1.163 markus 690: provider = buffer_get_string(&e->request, NULL);
1.87 markus 691: pin = buffer_get_string(&e->request, NULL);
1.110 djm 692:
693: while (buffer_len(&e->request)) {
1.158 djm 694: switch ((type = buffer_get_char(&e->request))) {
1.110 djm 695: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.175 dtucker 696: death = monotime() + buffer_get_int(&e->request);
1.110 djm 697: break;
698: case SSH_AGENT_CONSTRAIN_CONFIRM:
699: confirm = 1;
700: break;
701: default:
1.158 djm 702: error("process_add_smartcard_key: "
703: "Unknown constraint type %d", type);
704: goto send;
1.110 djm 705: }
706: }
707: if (lifetime && !death)
1.175 dtucker 708: death = monotime() + lifetime;
1.110 djm 709:
1.163 markus 710: count = pkcs11_add_provider(provider, pin, &keys);
711: for (i = 0; i < count; i++) {
1.84 markus 712: k = keys[i];
713: version = k->type == KEY_RSA1 ? 1 : 2;
714: tab = idtab_lookup(version);
715: if (lookup_identity(k, version) == NULL) {
1.163 markus 716: id = xcalloc(1, sizeof(Identity));
1.84 markus 717: id->key = k;
1.163 markus 718: id->provider = xstrdup(provider);
719: id->comment = xstrdup(provider); /* XXX */
1.110 djm 720: id->death = death;
721: id->confirm = confirm;
1.84 markus 722: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
723: tab->nentries++;
724: success = 1;
725: } else {
726: key_free(k);
727: }
728: keys[i] = NULL;
1.59 markus 729: }
730: send:
1.173 djm 731: free(pin);
732: free(provider);
733: free(keys);
1.59 markus 734: buffer_put_int(&e->output, 1);
735: buffer_put_char(&e->output,
736: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
737: }
738:
739: static void
740: process_remove_smartcard_key(SocketEntry *e)
741: {
1.163 markus 742: char *provider = NULL, *pin = NULL;
743: int version, success = 0;
744: Identity *id, *nxt;
1.84 markus 745: Idtab *tab;
1.59 markus 746:
1.163 markus 747: provider = buffer_get_string(&e->request, NULL);
1.87 markus 748: pin = buffer_get_string(&e->request, NULL);
1.173 djm 749: free(pin);
1.59 markus 750:
1.163 markus 751: for (version = 1; version < 3; version++) {
752: tab = idtab_lookup(version);
753: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
754: nxt = TAILQ_NEXT(id, next);
755: if (!strcmp(provider, id->provider)) {
756: TAILQ_REMOVE(&tab->idlist, id, next);
757: free_identity(id);
758: tab->nentries--;
759: }
1.59 markus 760: }
761: }
1.163 markus 762: if (pkcs11_del_provider(provider) == 0)
763: success = 1;
764: else
765: error("process_remove_smartcard_key:"
766: " pkcs11_del_provider failed");
1.173 djm 767: free(provider);
1.59 markus 768: buffer_put_int(&e->output, 1);
769: buffer_put_char(&e->output,
770: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
771: }
1.163 markus 772: #endif /* ENABLE_PKCS11 */
1.59 markus 773:
1.33 markus 774: /* dispatch incoming messages */
775:
1.55 itojun 776: static void
1.2 provos 777: process_message(SocketEntry *e)
1.1 deraadt 778: {
1.96 deraadt 779: u_int msg_len, type;
1.45 markus 780: u_char *cp;
1.89 markus 781:
1.21 markus 782: if (buffer_len(&e->input) < 5)
783: return; /* Incomplete message. */
1.77 stevesk 784: cp = buffer_ptr(&e->input);
1.137 djm 785: msg_len = get_u32(cp);
1.21 markus 786: if (msg_len > 256 * 1024) {
1.101 stevesk 787: close_socket(e);
1.21 markus 788: return;
789: }
790: if (buffer_len(&e->input) < msg_len + 4)
791: return;
1.87 markus 792:
793: /* move the current input to e->request */
1.21 markus 794: buffer_consume(&e->input, 4);
1.87 markus 795: buffer_clear(&e->request);
796: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
797: buffer_consume(&e->input, msg_len);
798: type = buffer_get_char(&e->request);
1.21 markus 799:
1.88 markus 800: /* check wheter agent is locked */
801: if (locked && type != SSH_AGENTC_UNLOCK) {
802: buffer_clear(&e->request);
803: switch (type) {
804: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
805: case SSH2_AGENTC_REQUEST_IDENTITIES:
806: /* send empty lists */
807: no_identities(e, type);
808: break;
809: default:
810: /* send a fail message for all other request types */
811: buffer_put_int(&e->output, 1);
812: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
813: }
814: return;
815: }
816:
1.59 markus 817: debug("type %d", type);
1.21 markus 818: switch (type) {
1.88 markus 819: case SSH_AGENTC_LOCK:
820: case SSH_AGENTC_UNLOCK:
821: process_lock_agent(e, type == SSH_AGENTC_LOCK);
822: break;
1.33 markus 823: /* ssh1 */
824: case SSH_AGENTC_RSA_CHALLENGE:
825: process_authentication_challenge1(e);
826: break;
1.21 markus 827: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 828: process_request_identities(e, 1);
1.21 markus 829: break;
830: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 831: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 832: process_add_identity(e, 1);
1.21 markus 833: break;
834: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 835: process_remove_identity(e, 1);
1.21 markus 836: break;
837: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 838: process_remove_all_identities(e, 1);
839: break;
840: /* ssh2 */
841: case SSH2_AGENTC_SIGN_REQUEST:
842: process_sign_request2(e);
843: break;
844: case SSH2_AGENTC_REQUEST_IDENTITIES:
845: process_request_identities(e, 2);
846: break;
847: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 848: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 849: process_add_identity(e, 2);
850: break;
851: case SSH2_AGENTC_REMOVE_IDENTITY:
852: process_remove_identity(e, 2);
853: break;
854: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
855: process_remove_all_identities(e, 2);
1.21 markus 856: break;
1.163 markus 857: #ifdef ENABLE_PKCS11
1.59 markus 858: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 859: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 860: process_add_smartcard_key(e);
1.75 deraadt 861: break;
1.59 markus 862: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
863: process_remove_smartcard_key(e);
1.75 deraadt 864: break;
1.163 markus 865: #endif /* ENABLE_PKCS11 */
1.21 markus 866: default:
867: /* Unknown message. Respond with failure. */
868: error("Unknown message %d", type);
1.87 markus 869: buffer_clear(&e->request);
1.21 markus 870: buffer_put_int(&e->output, 1);
871: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
872: break;
873: }
1.1 deraadt 874: }
875:
1.55 itojun 876: static void
1.73 stevesk 877: new_socket(sock_type type, int fd)
1.1 deraadt 878: {
1.112 markus 879: u_int i, old_alloc, new_alloc;
1.96 deraadt 880:
1.119 djm 881: set_nonblock(fd);
1.21 markus 882:
883: if (fd > max_fd)
884: max_fd = fd;
885:
886: for (i = 0; i < sockets_alloc; i++)
887: if (sockets[i].type == AUTH_UNUSED) {
888: sockets[i].fd = fd;
889: buffer_init(&sockets[i].input);
890: buffer_init(&sockets[i].output);
1.87 markus 891: buffer_init(&sockets[i].request);
1.112 markus 892: sockets[i].type = type;
1.21 markus 893: return;
894: }
895: old_alloc = sockets_alloc;
1.112 markus 896: new_alloc = sockets_alloc + 10;
1.133 djm 897: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 898: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 899: sockets[i].type = AUTH_UNUSED;
1.112 markus 900: sockets_alloc = new_alloc;
1.21 markus 901: sockets[old_alloc].fd = fd;
902: buffer_init(&sockets[old_alloc].input);
903: buffer_init(&sockets[old_alloc].output);
1.87 markus 904: buffer_init(&sockets[old_alloc].request);
1.112 markus 905: sockets[old_alloc].type = type;
1.1 deraadt 906: }
907:
1.55 itojun 908: static int
1.155 dtucker 909: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
910: struct timeval **tvpp)
1.1 deraadt 911: {
1.174 dtucker 912: u_int i, sz;
1.46 markus 913: int n = 0;
1.155 dtucker 914: static struct timeval tv;
1.174 dtucker 915: time_t deadline;
1.46 markus 916:
917: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 918: switch (sockets[i].type) {
919: case AUTH_SOCKET:
920: case AUTH_CONNECTION:
1.46 markus 921: n = MAX(n, sockets[i].fd);
1.21 markus 922: break;
923: case AUTH_UNUSED:
924: break;
925: default:
926: fatal("Unknown socket type %d", sockets[i].type);
927: break;
928: }
1.46 markus 929: }
930:
931: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 932: if (*fdrp == NULL || sz > *nallocp) {
1.173 djm 933: free(*fdrp);
934: free(*fdwp);
1.46 markus 935: *fdrp = xmalloc(sz);
936: *fdwp = xmalloc(sz);
1.66 markus 937: *nallocp = sz;
1.46 markus 938: }
1.66 markus 939: if (n < *fdl)
940: debug("XXX shrink: %d < %d", n, *fdl);
941: *fdl = n;
1.46 markus 942: memset(*fdrp, 0, sz);
943: memset(*fdwp, 0, sz);
944:
945: for (i = 0; i < sockets_alloc; i++) {
946: switch (sockets[i].type) {
947: case AUTH_SOCKET:
948: case AUTH_CONNECTION:
949: FD_SET(sockets[i].fd, *fdrp);
950: if (buffer_len(&sockets[i].output) > 0)
951: FD_SET(sockets[i].fd, *fdwp);
952: break;
953: default:
954: break;
955: }
956: }
1.155 dtucker 957: deadline = reaper();
958: if (parent_alive_interval != 0)
959: deadline = (deadline == 0) ? parent_alive_interval :
960: MIN(deadline, parent_alive_interval);
961: if (deadline == 0) {
962: *tvpp = NULL;
963: } else {
964: tv.tv_sec = deadline;
965: tv.tv_usec = 0;
966: *tvpp = &tv;
967: }
1.46 markus 968: return (1);
1.21 markus 969: }
970:
1.55 itojun 971: static void
1.21 markus 972: after_select(fd_set *readset, fd_set *writeset)
973: {
1.96 deraadt 974: struct sockaddr_un sunaddr;
1.26 markus 975: socklen_t slen;
1.21 markus 976: char buf[1024];
1.96 deraadt 977: int len, sock;
1.162 djm 978: u_int i, orig_alloc;
1.103 markus 979: uid_t euid;
980: gid_t egid;
1.21 markus 981:
1.162 djm 982: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 983: switch (sockets[i].type) {
984: case AUTH_UNUSED:
985: break;
986: case AUTH_SOCKET:
987: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 988: slen = sizeof(sunaddr);
1.46 markus 989: sock = accept(sockets[i].fd,
1.131 deraadt 990: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 991: if (sock < 0) {
1.81 stevesk 992: error("accept from AUTH_SOCKET: %s",
993: strerror(errno));
1.103 markus 994: break;
995: }
996: if (getpeereid(sock, &euid, &egid) < 0) {
997: error("getpeereid %d failed: %s",
998: sock, strerror(errno));
999: close(sock);
1000: break;
1001: }
1.105 markus 1002: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 1003: error("uid mismatch: "
1.104 stevesk 1004: "peer euid %u != uid %u",
1005: (u_int) euid, (u_int) getuid());
1.103 markus 1006: close(sock);
1.21 markus 1007: break;
1008: }
1009: new_socket(AUTH_CONNECTION, sock);
1010: }
1011: break;
1012: case AUTH_CONNECTION:
1013: if (buffer_len(&sockets[i].output) > 0 &&
1014: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 1015: len = write(sockets[i].fd,
1016: buffer_ptr(&sockets[i].output),
1017: buffer_len(&sockets[i].output));
1018: if (len == -1 && (errno == EAGAIN ||
1019: errno == EINTR))
1020: continue;
1.21 markus 1021: if (len <= 0) {
1.101 stevesk 1022: close_socket(&sockets[i]);
1.21 markus 1023: break;
1024: }
1025: buffer_consume(&sockets[i].output, len);
1026: }
1027: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 1028: len = read(sockets[i].fd, buf, sizeof(buf));
1029: if (len == -1 && (errno == EAGAIN ||
1030: errno == EINTR))
1031: continue;
1.21 markus 1032: if (len <= 0) {
1.101 stevesk 1033: close_socket(&sockets[i]);
1.21 markus 1034: break;
1035: }
1036: buffer_append(&sockets[i].input, buf, len);
1037: process_message(&sockets[i]);
1038: }
1039: break;
1040: default:
1041: fatal("Unknown type %d", sockets[i].type);
1042: }
1.1 deraadt 1043: }
1044:
1.55 itojun 1045: static void
1.113 markus 1046: cleanup_socket(void)
1.15 markus 1047: {
1.48 deraadt 1048: if (socket_name[0])
1049: unlink(socket_name);
1050: if (socket_dir[0])
1051: rmdir(socket_dir);
1.10 markus 1052: }
1053:
1.114 markus 1054: void
1.15 markus 1055: cleanup_exit(int i)
1056: {
1.113 markus 1057: cleanup_socket();
1058: _exit(i);
1.15 markus 1059: }
1060:
1.135 deraadt 1061: /*ARGSUSED*/
1.55 itojun 1062: static void
1.48 deraadt 1063: cleanup_handler(int sig)
1064: {
1.113 markus 1065: cleanup_socket();
1.163 markus 1066: #ifdef ENABLE_PKCS11
1067: pkcs11_terminate();
1068: #endif
1.48 deraadt 1069: _exit(2);
1.113 markus 1070: }
1071:
1.68 markus 1072: static void
1.155 dtucker 1073: check_parent_exists(void)
1.68 markus 1074: {
1.172 dtucker 1075: /*
1076: * If our parent has exited then getppid() will return (pid_t)1,
1077: * so testing for that should be safe.
1078: */
1079: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1080: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1081: cleanup_socket();
1082: _exit(2);
1.68 markus 1083: }
1.48 deraadt 1084: }
1085:
1.55 itojun 1086: static void
1.50 itojun 1087: usage(void)
1.15 markus 1088: {
1.156 sobrado 1089: fprintf(stderr, "usage: %s [options] [command [arg ...]]\n",
1.46 markus 1090: __progname);
1.72 jakob 1091: fprintf(stderr, "Options:\n");
1092: fprintf(stderr, " -c Generate C-shell commands on stdout.\n");
1093: fprintf(stderr, " -s Generate Bourne shell commands on stdout.\n");
1094: fprintf(stderr, " -k Kill the current agent.\n");
1095: fprintf(stderr, " -d Debug mode.\n");
1.86 markus 1096: fprintf(stderr, " -a socket Bind agent socket to given name.\n");
1.106 marc 1097: fprintf(stderr, " -t life Default identity lifetime (seconds).\n");
1.21 markus 1098: exit(1);
1.15 markus 1099: }
1100:
1.2 provos 1101: int
1102: main(int ac, char **av)
1.1 deraadt 1103: {
1.107 markus 1104: int c_flag = 0, d_flag = 0, k_flag = 0, s_flag = 0;
1.154 dtucker 1105: int sock, fd, ch, result, saved_errno;
1.120 avsm 1106: u_int nalloc;
1.96 deraadt 1107: char *shell, *format, *pidstr, *agentsocket = NULL;
1108: fd_set *readsetp = NULL, *writesetp = NULL;
1.21 markus 1109: struct sockaddr_un sunaddr;
1.41 markus 1110: struct rlimit rlim;
1.96 deraadt 1111: extern int optind;
1.98 stevesk 1112: extern char *optarg;
1.21 markus 1113: pid_t pid;
1.96 deraadt 1114: char pidstrbuf[1 + 3 * sizeof pid];
1.155 dtucker 1115: struct timeval *tvp = NULL;
1.161 tobias 1116: size_t len;
1.123 djm 1117:
1118: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1119: sanitise_stdfd();
1.99 markus 1120:
1121: /* drop */
1122: setegid(getgid());
1123: setgid(getgid());
1.53 markus 1124:
1.170 djm 1125: OpenSSL_add_all_algorithms();
1.21 markus 1126:
1.106 marc 1127: while ((ch = getopt(ac, av, "cdksa:t:")) != -1) {
1.21 markus 1128: switch (ch) {
1129: case 'c':
1130: if (s_flag)
1131: usage();
1132: c_flag++;
1133: break;
1134: case 'k':
1135: k_flag++;
1136: break;
1137: case 's':
1138: if (c_flag)
1139: usage();
1140: s_flag++;
1141: break;
1.57 markus 1142: case 'd':
1143: if (d_flag)
1144: usage();
1145: d_flag++;
1146: break;
1.86 markus 1147: case 'a':
1148: agentsocket = optarg;
1.106 marc 1149: break;
1150: case 't':
1151: if ((lifetime = convtime(optarg)) == -1) {
1152: fprintf(stderr, "Invalid lifetime\n");
1153: usage();
1154: }
1.86 markus 1155: break;
1.21 markus 1156: default:
1157: usage();
1158: }
1159: }
1160: ac -= optind;
1161: av += optind;
1162:
1.57 markus 1163: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag))
1.21 markus 1164: usage();
1165:
1.85 markus 1166: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 1167: shell = getenv("SHELL");
1.161 tobias 1168: if (shell != NULL && (len = strlen(shell)) > 2 &&
1169: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 1170: c_flag = 1;
1171: }
1172: if (k_flag) {
1.136 deraadt 1173: const char *errstr = NULL;
1174:
1.21 markus 1175: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
1176: if (pidstr == NULL) {
1177: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 1178: SSH_AGENTPID_ENV_NAME);
1.21 markus 1179: exit(1);
1180: }
1.136 deraadt 1181: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
1182: if (errstr) {
1183: fprintf(stderr,
1184: "%s=\"%s\", which is not a good PID: %s\n",
1185: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 1186: exit(1);
1187: }
1188: if (kill(pid, SIGTERM) == -1) {
1189: perror("kill");
1190: exit(1);
1191: }
1192: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 1193: printf(format, SSH_AUTHSOCKET_ENV_NAME);
1194: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 1195: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 1196: exit(0);
1197: }
1198: parent_pid = getpid();
1199:
1.86 markus 1200: if (agentsocket == NULL) {
1201: /* Create private directory for agent socket */
1.171 djm 1202: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 1203: if (mkdtemp(socket_dir) == NULL) {
1204: perror("mkdtemp: private socket dir");
1205: exit(1);
1206: }
1.91 mpech 1207: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
1208: (long)parent_pid);
1.86 markus 1209: } else {
1210: /* Try to use specified agent socket */
1211: socket_dir[0] = '\0';
1212: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 1213: }
1214:
1.23 markus 1215: /*
1216: * Create socket early so it will exist before command gets run from
1217: * the parent.
1218: */
1.21 markus 1219: sock = socket(AF_UNIX, SOCK_STREAM, 0);
1220: if (sock < 0) {
1221: perror("socket");
1.121 djm 1222: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1223: cleanup_exit(1);
1224: }
1225: memset(&sunaddr, 0, sizeof(sunaddr));
1226: sunaddr.sun_family = AF_UNIX;
1227: strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path));
1.131 deraadt 1228: if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
1.21 markus 1229: perror("bind");
1.121 djm 1230: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 1231: cleanup_exit(1);
1232: }
1.117 markus 1233: if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
1.21 markus 1234: perror("listen");
1235: cleanup_exit(1);
1236: }
1.46 markus 1237:
1.23 markus 1238: /*
1239: * Fork, and have the parent execute the command, if any, or present
1240: * the socket data. The child continues as the authentication agent.
1241: */
1.57 markus 1242: if (d_flag) {
1243: log_init(__progname, SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 1);
1244: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1245: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1246: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 1247: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.57 markus 1248: goto skip;
1249: }
1.21 markus 1250: pid = fork();
1251: if (pid == -1) {
1252: perror("fork");
1.81 stevesk 1253: cleanup_exit(1);
1.21 markus 1254: }
1255: if (pid != 0) { /* Parent - execute the given command. */
1256: close(sock);
1.91 mpech 1257: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 1258: if (ac == 0) {
1259: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
1260: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 1261: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 1262: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 1263: SSH_AGENTPID_ENV_NAME);
1.91 mpech 1264: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 1265: exit(0);
1266: }
1.36 deraadt 1267: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
1268: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
1269: perror("setenv");
1270: exit(1);
1271: }
1.21 markus 1272: execvp(av[0], av);
1273: perror(av[0]);
1274: exit(1);
1275: }
1.81 stevesk 1276: /* child */
1277: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 1278:
1279: if (setsid() == -1) {
1.81 stevesk 1280: error("setsid: %s", strerror(errno));
1.67 stevesk 1281: cleanup_exit(1);
1282: }
1283:
1284: (void)chdir("/");
1.107 markus 1285: if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
1286: /* XXX might close listen socket */
1287: (void)dup2(fd, STDIN_FILENO);
1288: (void)dup2(fd, STDOUT_FILENO);
1289: (void)dup2(fd, STDERR_FILENO);
1290: if (fd > 2)
1291: close(fd);
1292: }
1.21 markus 1293:
1.41 markus 1294: /* deny core dumps, since memory contains unencrypted private keys */
1295: rlim.rlim_cur = rlim.rlim_max = 0;
1296: if (setrlimit(RLIMIT_CORE, &rlim) < 0) {
1.81 stevesk 1297: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 1298: cleanup_exit(1);
1299: }
1.57 markus 1300:
1301: skip:
1.163 markus 1302:
1303: #ifdef ENABLE_PKCS11
1304: pkcs11_init(0);
1305: #endif
1.21 markus 1306: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 1307: if (ac > 0)
1308: parent_alive_interval = 10;
1.33 markus 1309: idtab_init();
1.61 markus 1310: signal(SIGPIPE, SIG_IGN);
1.177 ! djm 1311: signal(SIGINT, d_flag ? cleanup_handler : SIG_IGN);
1.48 deraadt 1312: signal(SIGHUP, cleanup_handler);
1313: signal(SIGTERM, cleanup_handler);
1.66 markus 1314: nalloc = 0;
1315:
1.21 markus 1316: while (1) {
1.155 dtucker 1317: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1318: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1319: saved_errno = errno;
1.155 dtucker 1320: if (parent_alive_interval != 0)
1321: check_parent_exists();
1322: (void) reaper(); /* remove expired keys */
1.154 dtucker 1323: if (result < 0) {
1324: if (saved_errno == EINTR)
1.21 markus 1325: continue;
1.154 dtucker 1326: fatal("select: %s", strerror(saved_errno));
1327: } else if (result > 0)
1328: after_select(readsetp, writesetp);
1.15 markus 1329: }
1.21 markus 1330: /* NOTREACHED */
1.1 deraadt 1331: }
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