Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.170
1.170 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.167 2010/08/12 23:34:38 tedu 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;
1.169 djm 455: char *type_name, *comment, *curve;
1.33 markus 456: Key *k = NULL;
1.169 djm 457: BIGNUM *exponent;
458: EC_POINT *q;
1.165 djm 459: u_char *cert;
460: u_int len;
1.33 markus 461:
462: switch (version) {
463: case 1:
1.39 markus 464: k = key_new_private(KEY_RSA1);
1.97 markus 465: (void) buffer_get_int(&e->request); /* ignored */
1.87 markus 466: buffer_get_bignum(&e->request, k->rsa->n);
467: buffer_get_bignum(&e->request, k->rsa->e);
468: buffer_get_bignum(&e->request, k->rsa->d);
469: buffer_get_bignum(&e->request, k->rsa->iqmp);
1.33 markus 470:
471: /* SSH and SSL have p and q swapped */
1.87 markus 472: buffer_get_bignum(&e->request, k->rsa->q); /* p */
473: buffer_get_bignum(&e->request, k->rsa->p); /* q */
1.33 markus 474:
475: /* Generate additional parameters */
1.60 markus 476: rsa_generate_additional_parameters(k->rsa);
1.33 markus 477: break;
478: case 2:
1.87 markus 479: type_name = buffer_get_string(&e->request, NULL);
1.46 markus 480: type = key_type_from_name(type_name);
1.74 deraadt 481: switch (type) {
1.39 markus 482: case KEY_DSA:
483: k = key_new_private(type);
1.87 markus 484: buffer_get_bignum2(&e->request, k->dsa->p);
485: buffer_get_bignum2(&e->request, k->dsa->q);
486: buffer_get_bignum2(&e->request, k->dsa->g);
487: buffer_get_bignum2(&e->request, k->dsa->pub_key);
488: buffer_get_bignum2(&e->request, k->dsa->priv_key);
1.39 markus 489: break;
1.166 djm 490: case KEY_DSA_CERT_V00:
1.165 djm 491: case KEY_DSA_CERT:
492: cert = buffer_get_string(&e->request, &len);
493: if ((k = key_from_blob(cert, len)) == NULL)
494: fatal("Certificate parse failed");
495: xfree(cert);
496: key_add_private(k);
497: buffer_get_bignum2(&e->request, k->dsa->priv_key);
498: break;
1.169 djm 499: case KEY_ECDSA:
500: k = key_new_private(type);
501: k->ecdsa_nid = key_ecdsa_nid_from_name(type_name);
502: curve = buffer_get_string(&e->request, NULL);
503: if (k->ecdsa_nid != key_curve_name_to_nid(curve))
504: fatal("%s: curve names mismatch", __func__);
505: xfree(curve);
506: k->ecdsa = EC_KEY_new_by_curve_name(k->ecdsa_nid);
507: if (k->ecdsa == NULL)
508: fatal("%s: EC_KEY_new_by_curve_name failed",
509: __func__);
510: q = EC_POINT_new(EC_KEY_get0_group(k->ecdsa));
511: if (q == NULL)
512: fatal("%s: BN_new failed", __func__);
513: if ((exponent = BN_new()) == NULL)
514: fatal("%s: BN_new failed", __func__);
515: buffer_get_ecpoint(&e->request,
516: EC_KEY_get0_group(k->ecdsa), q);
517: buffer_get_bignum2(&e->request, exponent);
518: if (EC_KEY_set_public_key(k->ecdsa, q) != 1)
519: fatal("%s: EC_KEY_set_public_key failed",
520: __func__);
521: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
522: fatal("%s: EC_KEY_set_private_key failed",
523: __func__);
524: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
525: EC_KEY_get0_public_key(k->ecdsa)) != 0)
526: fatal("%s: bad ECDSA public key", __func__);
527: if (key_ec_validate_private(k->ecdsa) != 0)
528: fatal("%s: bad ECDSA private key", __func__);
529: BN_clear_free(exponent);
530: EC_POINT_free(q);
531: break;
532: case KEY_ECDSA_CERT:
533: cert = buffer_get_string(&e->request, &len);
534: if ((k = key_from_blob(cert, len)) == NULL)
535: fatal("Certificate parse failed");
536: xfree(cert);
537: key_add_private(k);
538: if ((exponent = BN_new()) == NULL)
539: fatal("%s: BN_new failed", __func__);
540: buffer_get_bignum2(&e->request, exponent);
541: if (EC_KEY_set_private_key(k->ecdsa, exponent) != 1)
542: fatal("%s: EC_KEY_set_private_key failed",
543: __func__);
544: if (key_ec_validate_public(EC_KEY_get0_group(k->ecdsa),
545: EC_KEY_get0_public_key(k->ecdsa)) != 0 ||
546: key_ec_validate_private(k->ecdsa) != 0)
547: fatal("%s: bad ECDSA key", __func__);
548: BN_clear_free(exponent);
549: break;
1.39 markus 550: case KEY_RSA:
551: k = key_new_private(type);
1.87 markus 552: buffer_get_bignum2(&e->request, k->rsa->n);
553: buffer_get_bignum2(&e->request, k->rsa->e);
554: buffer_get_bignum2(&e->request, k->rsa->d);
555: buffer_get_bignum2(&e->request, k->rsa->iqmp);
556: buffer_get_bignum2(&e->request, k->rsa->p);
557: buffer_get_bignum2(&e->request, k->rsa->q);
1.39 markus 558:
559: /* Generate additional parameters */
1.60 markus 560: rsa_generate_additional_parameters(k->rsa);
1.39 markus 561: break;
1.166 djm 562: case KEY_RSA_CERT_V00:
1.165 djm 563: case KEY_RSA_CERT:
564: cert = buffer_get_string(&e->request, &len);
565: if ((k = key_from_blob(cert, len)) == NULL)
566: fatal("Certificate parse failed");
567: xfree(cert);
568: key_add_private(k);
569: buffer_get_bignum2(&e->request, k->rsa->d);
570: buffer_get_bignum2(&e->request, k->rsa->iqmp);
571: buffer_get_bignum2(&e->request, k->rsa->p);
572: buffer_get_bignum2(&e->request, k->rsa->q);
573: break;
1.39 markus 574: default:
1.169 djm 575: xfree(type_name);
1.87 markus 576: buffer_clear(&e->request);
1.108 markus 577: goto send;
578: }
1.169 djm 579: xfree(type_name);
1.108 markus 580: break;
581: }
582: /* enable blinding */
583: switch (k->type) {
584: case KEY_RSA:
1.166 djm 585: case KEY_RSA_CERT_V00:
1.165 djm 586: case KEY_RSA_CERT:
1.108 markus 587: case KEY_RSA1:
588: if (RSA_blinding_on(k->rsa, NULL) != 1) {
589: error("process_add_identity: RSA_blinding_on failed");
590: key_free(k);
1.33 markus 591: goto send;
1.21 markus 592: }
1.33 markus 593: break;
594: }
1.87 markus 595: comment = buffer_get_string(&e->request, NULL);
1.33 markus 596: if (k == NULL) {
597: xfree(comment);
598: goto send;
599: }
1.94 markus 600: while (buffer_len(&e->request)) {
1.158 djm 601: switch ((type = buffer_get_char(&e->request))) {
1.94 markus 602: case SSH_AGENT_CONSTRAIN_LIFETIME:
603: death = time(NULL) + buffer_get_int(&e->request);
604: break;
1.107 markus 605: case SSH_AGENT_CONSTRAIN_CONFIRM:
606: confirm = 1;
607: break;
1.94 markus 608: default:
1.158 djm 609: error("process_add_identity: "
610: "Unknown constraint type %d", type);
611: xfree(comment);
612: key_free(k);
613: goto send;
1.94 markus 614: }
615: }
1.158 djm 616: success = 1;
1.106 marc 617: if (lifetime && !death)
618: death = time(NULL) + lifetime;
1.157 canacar 619: if ((id = lookup_identity(k, version)) == NULL) {
1.163 markus 620: id = xcalloc(1, sizeof(Identity));
1.78 provos 621: id->key = k;
622: TAILQ_INSERT_TAIL(&tab->idlist, id, next);
1.33 markus 623: /* Increment the number of identities. */
624: tab->nentries++;
625: } else {
626: key_free(k);
1.157 canacar 627: xfree(id->comment);
1.33 markus 628: }
1.157 canacar 629: id->comment = comment;
630: id->death = death;
631: id->confirm = confirm;
1.33 markus 632: send:
1.1 deraadt 633: buffer_put_int(&e->output, 1);
1.33 markus 634: buffer_put_char(&e->output,
635: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
1.1 deraadt 636: }
637:
1.88 markus 638: /* XXX todo: encrypt sensitive data with passphrase */
639: static void
640: process_lock_agent(SocketEntry *e, int lock)
641: {
1.96 deraadt 642: int success = 0;
1.88 markus 643: char *passwd;
644:
645: passwd = buffer_get_string(&e->request, NULL);
646: if (locked && !lock && strcmp(passwd, lock_passwd) == 0) {
647: locked = 0;
648: memset(lock_passwd, 0, strlen(lock_passwd));
649: xfree(lock_passwd);
650: lock_passwd = NULL;
651: success = 1;
652: } else if (!locked && lock) {
653: locked = 1;
654: lock_passwd = xstrdup(passwd);
655: success = 1;
656: }
657: memset(passwd, 0, strlen(passwd));
658: xfree(passwd);
1.95 deraadt 659:
1.88 markus 660: buffer_put_int(&e->output, 1);
661: buffer_put_char(&e->output,
662: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
663: }
664:
665: static void
666: no_identities(SocketEntry *e, u_int type)
667: {
668: Buffer msg;
669:
670: buffer_init(&msg);
671: buffer_put_char(&msg,
672: (type == SSH_AGENTC_REQUEST_RSA_IDENTITIES) ?
673: SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER);
674: buffer_put_int(&msg, 0);
675: buffer_put_int(&e->output, buffer_len(&msg));
676: buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg));
677: buffer_free(&msg);
678: }
1.59 markus 679:
1.163 markus 680: #ifdef ENABLE_PKCS11
1.59 markus 681: static void
1.158 djm 682: process_add_smartcard_key(SocketEntry *e)
1.59 markus 683: {
1.163 markus 684: char *provider = NULL, *pin;
685: int i, type, version, count = 0, success = 0, death = 0, confirm = 0;
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:
696: death = time(NULL) + buffer_get_int(&e->request);
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)
708: death = time(NULL) + lifetime;
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:
1.163 markus 731: if (pin)
732: xfree(pin);
733: if (provider)
734: xfree(provider);
735: if (keys)
736: xfree(keys);
1.59 markus 737: buffer_put_int(&e->output, 1);
738: buffer_put_char(&e->output,
739: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
740: }
741:
742: static void
743: process_remove_smartcard_key(SocketEntry *e)
744: {
1.163 markus 745: char *provider = NULL, *pin = NULL;
746: int version, success = 0;
747: Identity *id, *nxt;
1.84 markus 748: Idtab *tab;
1.59 markus 749:
1.163 markus 750: provider = buffer_get_string(&e->request, NULL);
1.87 markus 751: pin = buffer_get_string(&e->request, NULL);
1.83 rees 752: xfree(pin);
1.59 markus 753:
1.163 markus 754: for (version = 1; version < 3; version++) {
755: tab = idtab_lookup(version);
756: for (id = TAILQ_FIRST(&tab->idlist); id; id = nxt) {
757: nxt = TAILQ_NEXT(id, next);
758: if (!strcmp(provider, id->provider)) {
759: TAILQ_REMOVE(&tab->idlist, id, next);
760: free_identity(id);
761: tab->nentries--;
762: }
1.59 markus 763: }
764: }
1.163 markus 765: if (pkcs11_del_provider(provider) == 0)
766: success = 1;
767: else
768: error("process_remove_smartcard_key:"
769: " pkcs11_del_provider failed");
770: xfree(provider);
1.59 markus 771: buffer_put_int(&e->output, 1);
772: buffer_put_char(&e->output,
773: success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE);
774: }
1.163 markus 775: #endif /* ENABLE_PKCS11 */
1.59 markus 776:
1.33 markus 777: /* dispatch incoming messages */
778:
1.55 itojun 779: static void
1.2 provos 780: process_message(SocketEntry *e)
1.1 deraadt 781: {
1.96 deraadt 782: u_int msg_len, type;
1.45 markus 783: u_char *cp;
1.89 markus 784:
1.21 markus 785: if (buffer_len(&e->input) < 5)
786: return; /* Incomplete message. */
1.77 stevesk 787: cp = buffer_ptr(&e->input);
1.137 djm 788: msg_len = get_u32(cp);
1.21 markus 789: if (msg_len > 256 * 1024) {
1.101 stevesk 790: close_socket(e);
1.21 markus 791: return;
792: }
793: if (buffer_len(&e->input) < msg_len + 4)
794: return;
1.87 markus 795:
796: /* move the current input to e->request */
1.21 markus 797: buffer_consume(&e->input, 4);
1.87 markus 798: buffer_clear(&e->request);
799: buffer_append(&e->request, buffer_ptr(&e->input), msg_len);
800: buffer_consume(&e->input, msg_len);
801: type = buffer_get_char(&e->request);
1.21 markus 802:
1.88 markus 803: /* check wheter agent is locked */
804: if (locked && type != SSH_AGENTC_UNLOCK) {
805: buffer_clear(&e->request);
806: switch (type) {
807: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
808: case SSH2_AGENTC_REQUEST_IDENTITIES:
809: /* send empty lists */
810: no_identities(e, type);
811: break;
812: default:
813: /* send a fail message for all other request types */
814: buffer_put_int(&e->output, 1);
815: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
816: }
817: return;
818: }
819:
1.59 markus 820: debug("type %d", type);
1.21 markus 821: switch (type) {
1.88 markus 822: case SSH_AGENTC_LOCK:
823: case SSH_AGENTC_UNLOCK:
824: process_lock_agent(e, type == SSH_AGENTC_LOCK);
825: break;
1.33 markus 826: /* ssh1 */
827: case SSH_AGENTC_RSA_CHALLENGE:
828: process_authentication_challenge1(e);
829: break;
1.21 markus 830: case SSH_AGENTC_REQUEST_RSA_IDENTITIES:
1.33 markus 831: process_request_identities(e, 1);
1.21 markus 832: break;
833: case SSH_AGENTC_ADD_RSA_IDENTITY:
1.94 markus 834: case SSH_AGENTC_ADD_RSA_ID_CONSTRAINED:
1.33 markus 835: process_add_identity(e, 1);
1.21 markus 836: break;
837: case SSH_AGENTC_REMOVE_RSA_IDENTITY:
1.33 markus 838: process_remove_identity(e, 1);
1.21 markus 839: break;
840: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.33 markus 841: process_remove_all_identities(e, 1);
842: break;
843: /* ssh2 */
844: case SSH2_AGENTC_SIGN_REQUEST:
845: process_sign_request2(e);
846: break;
847: case SSH2_AGENTC_REQUEST_IDENTITIES:
848: process_request_identities(e, 2);
849: break;
850: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 851: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.33 markus 852: process_add_identity(e, 2);
853: break;
854: case SSH2_AGENTC_REMOVE_IDENTITY:
855: process_remove_identity(e, 2);
856: break;
857: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
858: process_remove_all_identities(e, 2);
1.21 markus 859: break;
1.163 markus 860: #ifdef ENABLE_PKCS11
1.59 markus 861: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 862: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 863: process_add_smartcard_key(e);
1.75 deraadt 864: break;
1.59 markus 865: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
866: process_remove_smartcard_key(e);
1.75 deraadt 867: break;
1.163 markus 868: #endif /* ENABLE_PKCS11 */
1.21 markus 869: default:
870: /* Unknown message. Respond with failure. */
871: error("Unknown message %d", type);
1.87 markus 872: buffer_clear(&e->request);
1.21 markus 873: buffer_put_int(&e->output, 1);
874: buffer_put_char(&e->output, SSH_AGENT_FAILURE);
875: break;
876: }
1.1 deraadt 877: }
878:
1.55 itojun 879: static void
1.73 stevesk 880: new_socket(sock_type type, int fd)
1.1 deraadt 881: {
1.112 markus 882: u_int i, old_alloc, new_alloc;
1.96 deraadt 883:
1.119 djm 884: set_nonblock(fd);
1.21 markus 885:
886: if (fd > max_fd)
887: max_fd = fd;
888:
889: for (i = 0; i < sockets_alloc; i++)
890: if (sockets[i].type == AUTH_UNUSED) {
891: sockets[i].fd = fd;
892: buffer_init(&sockets[i].input);
893: buffer_init(&sockets[i].output);
1.87 markus 894: buffer_init(&sockets[i].request);
1.112 markus 895: sockets[i].type = type;
1.21 markus 896: return;
897: }
898: old_alloc = sockets_alloc;
1.112 markus 899: new_alloc = sockets_alloc + 10;
1.133 djm 900: sockets = xrealloc(sockets, new_alloc, sizeof(sockets[0]));
1.112 markus 901: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 902: sockets[i].type = AUTH_UNUSED;
1.112 markus 903: sockets_alloc = new_alloc;
1.21 markus 904: sockets[old_alloc].fd = fd;
905: buffer_init(&sockets[old_alloc].input);
906: buffer_init(&sockets[old_alloc].output);
1.87 markus 907: buffer_init(&sockets[old_alloc].request);
1.112 markus 908: sockets[old_alloc].type = type;
1.1 deraadt 909: }
910:
1.55 itojun 911: static int
1.155 dtucker 912: prepare_select(fd_set **fdrp, fd_set **fdwp, int *fdl, u_int *nallocp,
913: struct timeval **tvpp)
1.1 deraadt 914: {
1.155 dtucker 915: u_int i, sz, deadline;
1.46 markus 916: int n = 0;
1.155 dtucker 917: static struct timeval tv;
1.46 markus 918:
919: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 920: switch (sockets[i].type) {
921: case AUTH_SOCKET:
922: case AUTH_CONNECTION:
1.46 markus 923: n = MAX(n, sockets[i].fd);
1.21 markus 924: break;
925: case AUTH_UNUSED:
926: break;
927: default:
928: fatal("Unknown socket type %d", sockets[i].type);
929: break;
930: }
1.46 markus 931: }
932:
933: sz = howmany(n+1, NFDBITS) * sizeof(fd_mask);
1.66 markus 934: if (*fdrp == NULL || sz > *nallocp) {
1.46 markus 935: if (*fdrp)
1.54 stevesk 936: xfree(*fdrp);
1.46 markus 937: if (*fdwp)
1.54 stevesk 938: xfree(*fdwp);
1.46 markus 939: *fdrp = xmalloc(sz);
940: *fdwp = xmalloc(sz);
1.66 markus 941: *nallocp = sz;
1.46 markus 942: }
1.66 markus 943: if (n < *fdl)
944: debug("XXX shrink: %d < %d", n, *fdl);
945: *fdl = n;
1.46 markus 946: memset(*fdrp, 0, sz);
947: memset(*fdwp, 0, sz);
948:
949: for (i = 0; i < sockets_alloc; i++) {
950: switch (sockets[i].type) {
951: case AUTH_SOCKET:
952: case AUTH_CONNECTION:
953: FD_SET(sockets[i].fd, *fdrp);
954: if (buffer_len(&sockets[i].output) > 0)
955: FD_SET(sockets[i].fd, *fdwp);
956: break;
957: default:
958: break;
959: }
960: }
1.155 dtucker 961: deadline = reaper();
962: if (parent_alive_interval != 0)
963: deadline = (deadline == 0) ? parent_alive_interval :
964: MIN(deadline, parent_alive_interval);
965: if (deadline == 0) {
966: *tvpp = NULL;
967: } else {
968: tv.tv_sec = deadline;
969: tv.tv_usec = 0;
970: *tvpp = &tv;
971: }
1.46 markus 972: return (1);
1.21 markus 973: }
974:
1.55 itojun 975: static void
1.21 markus 976: after_select(fd_set *readset, fd_set *writeset)
977: {
1.96 deraadt 978: struct sockaddr_un sunaddr;
1.26 markus 979: socklen_t slen;
1.21 markus 980: char buf[1024];
1.96 deraadt 981: int len, sock;
1.162 djm 982: u_int i, orig_alloc;
1.103 markus 983: uid_t euid;
984: gid_t egid;
1.21 markus 985:
1.162 djm 986: for (i = 0, orig_alloc = sockets_alloc; i < orig_alloc; i++)
1.21 markus 987: switch (sockets[i].type) {
988: case AUTH_UNUSED:
989: break;
990: case AUTH_SOCKET:
991: if (FD_ISSET(sockets[i].fd, readset)) {
1.26 markus 992: slen = sizeof(sunaddr);
1.46 markus 993: sock = accept(sockets[i].fd,
1.131 deraadt 994: (struct sockaddr *)&sunaddr, &slen);
1.21 markus 995: if (sock < 0) {
1.81 stevesk 996: error("accept from AUTH_SOCKET: %s",
997: strerror(errno));
1.103 markus 998: break;
999: }
1000: if (getpeereid(sock, &euid, &egid) < 0) {
1001: error("getpeereid %d failed: %s",
1002: sock, strerror(errno));
1003: close(sock);
1004: break;
1005: }
1.105 markus 1006: if ((euid != 0) && (getuid() != euid)) {
1.103 markus 1007: error("uid mismatch: "
1.104 stevesk 1008: "peer euid %u != uid %u",
1009: (u_int) euid, (u_int) getuid());
1.103 markus 1010: close(sock);
1.21 markus 1011: break;
1012: }
1013: new_socket(AUTH_CONNECTION, sock);
1014: }
1015: break;
1016: case AUTH_CONNECTION:
1017: if (buffer_len(&sockets[i].output) > 0 &&
1018: FD_ISSET(sockets[i].fd, writeset)) {
1.162 djm 1019: len = write(sockets[i].fd,
1020: buffer_ptr(&sockets[i].output),
1021: buffer_len(&sockets[i].output));
1022: if (len == -1 && (errno == EAGAIN ||
1023: errno == EINTR))
1024: continue;
1.21 markus 1025: if (len <= 0) {
1.101 stevesk 1026: close_socket(&sockets[i]);
1.21 markus 1027: break;
1028: }
1029: buffer_consume(&sockets[i].output, len);
1030: }
1031: if (FD_ISSET(sockets[i].fd, readset)) {
1.162 djm 1032: len = read(sockets[i].fd, buf, sizeof(buf));
1033: if (len == -1 && (errno == EAGAIN ||
1034: errno == EINTR))
1035: continue;
1.21 markus 1036: if (len <= 0) {
1.101 stevesk 1037: close_socket(&sockets[i]);
1.21 markus 1038: break;
1039: }
1040: buffer_append(&sockets[i].input, buf, len);
1041: process_message(&sockets[i]);
1042: }
1043: break;
1044: default:
1045: fatal("Unknown type %d", sockets[i].type);
1046: }
1.1 deraadt 1047: }
1048:
1.55 itojun 1049: static void
1.113 markus 1050: cleanup_socket(void)
1.15 markus 1051: {
1.48 deraadt 1052: if (socket_name[0])
1053: unlink(socket_name);
1054: if (socket_dir[0])
1055: rmdir(socket_dir);
1.10 markus 1056: }
1057:
1.114 markus 1058: void
1.15 markus 1059: cleanup_exit(int i)
1060: {
1.113 markus 1061: cleanup_socket();
1062: _exit(i);
1.15 markus 1063: }
1064:
1.135 deraadt 1065: /*ARGSUSED*/
1.55 itojun 1066: static void
1.48 deraadt 1067: cleanup_handler(int sig)
1068: {
1.113 markus 1069: cleanup_socket();
1.163 markus 1070: #ifdef ENABLE_PKCS11
1071: pkcs11_terminate();
1072: #endif
1.48 deraadt 1073: _exit(2);
1.113 markus 1074: }
1075:
1.68 markus 1076: static void
1.155 dtucker 1077: check_parent_exists(void)
1.68 markus 1078: {
1079: if (parent_pid != -1 && kill(parent_pid, 0) < 0) {
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 */
1.115 markus 1202: strlcpy(socket_dir, "/tmp/ssh-XXXXXXXXXX", 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: if (!d_flag)
1.57 markus 1311: signal(SIGINT, SIG_IGN);
1.61 markus 1312: signal(SIGPIPE, SIG_IGN);
1.48 deraadt 1313: signal(SIGHUP, cleanup_handler);
1314: signal(SIGTERM, cleanup_handler);
1.66 markus 1315: nalloc = 0;
1316:
1.21 markus 1317: while (1) {
1.155 dtucker 1318: prepare_select(&readsetp, &writesetp, &max_fd, &nalloc, &tvp);
1319: result = select(max_fd + 1, readsetp, writesetp, NULL, tvp);
1.154 dtucker 1320: saved_errno = errno;
1.155 dtucker 1321: if (parent_alive_interval != 0)
1322: check_parent_exists();
1323: (void) reaper(); /* remove expired keys */
1.154 dtucker 1324: if (result < 0) {
1325: if (saved_errno == EINTR)
1.21 markus 1326: continue;
1.154 dtucker 1327: fatal("select: %s", strerror(saved_errno));
1328: } else if (result > 0)
1329: after_select(readsetp, writesetp);
1.15 markus 1330: }
1.21 markus 1331: /* NOTREACHED */
1.1 deraadt 1332: }
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