Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.285
1.285 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.284 2022/01/01 01:55:30 jsg 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>
1.141 stevesk 41: #include <sys/socket.h>
1.189 djm 42: #include <sys/stat.h>
1.128 stevesk 43: #include <sys/un.h>
1.238 djm 44: #include <sys/wait.h>
1.126 stevesk 45:
1.185 markus 46: #ifdef WITH_OPENSSL
1.146 stevesk 47: #include <openssl/evp.h>
1.185 markus 48: #endif
1.146 stevesk 49:
1.143 stevesk 50: #include <errno.h>
1.142 stevesk 51: #include <fcntl.h>
1.126 stevesk 52: #include <paths.h>
1.223 djm 53: #include <poll.h>
1.129 stevesk 54: #include <signal.h>
1.149 stevesk 55: #include <stdlib.h>
1.150 stevesk 56: #include <stdio.h>
1.146 stevesk 57: #include <string.h>
1.248 naddy 58: #include <stdarg.h>
1.196 deraadt 59: #include <limits.h>
1.145 stevesk 60: #include <time.h>
1.144 stevesk 61: #include <unistd.h>
1.203 dtucker 62: #include <util.h>
1.194 markus 63:
1.151 deraadt 64: #include "xmalloc.h"
1.1 deraadt 65: #include "ssh.h"
1.258 djm 66: #include "ssh2.h"
1.194 markus 67: #include "sshbuf.h"
68: #include "sshkey.h"
1.32 markus 69: #include "authfd.h"
1.37 markus 70: #include "compat.h"
1.47 markus 71: #include "log.h"
1.107 markus 72: #include "misc.h"
1.182 markus 73: #include "digest.h"
1.194 markus 74: #include "ssherr.h"
1.215 djm 75: #include "match.h"
1.238 djm 76: #include "msg.h"
1.244 djm 77: #include "ssherr.h"
1.238 djm 78: #include "pathnames.h"
1.163 markus 79: #include "ssh-pkcs11.h"
1.251 djm 80: #include "sk-api.h"
1.281 djm 81: #include "myproposal.h"
1.59 markus 82:
1.262 djm 83: #ifndef DEFAULT_ALLOWED_PROVIDERS
84: # define DEFAULT_ALLOWED_PROVIDERS "/usr/lib*/*,/usr/local/lib*/*"
1.215 djm 85: #endif
86:
1.223 djm 87: /* Maximum accepted message length */
1.280 djm 88: #define AGENT_MAX_LEN (256*1024)
1.233 djm 89: /* Maximum bytes to read from client socket */
1.280 djm 90: #define AGENT_RBUF_LEN (4096)
91: /* Maximum number of recorded session IDs/hostkeys per connection */
92: #define AGENT_MAX_SESSION_IDS 16
93: /* Maximum size of session ID */
94: #define AGENT_MAX_SID_LEN 128
1.281 djm 95: /* Maximum number of destination constraints to accept on a key */
96: #define AGENT_MAX_DEST_CONSTRAINTS 1024
1.280 djm 97:
98: /* XXX store hostkey_sid in a refcounted tree */
1.223 djm 99:
1.73 stevesk 100: typedef enum {
1.275 djm 101: AUTH_UNUSED = 0,
102: AUTH_SOCKET = 1,
103: AUTH_CONNECTION = 2,
1.73 stevesk 104: } sock_type;
105:
1.280 djm 106: struct hostkey_sid {
107: struct sshkey *key;
108: struct sshbuf *sid;
109: int forwarded;
110: };
111:
1.274 djm 112: typedef struct socket_entry {
1.21 markus 113: int fd;
1.73 stevesk 114: sock_type type;
1.194 markus 115: struct sshbuf *input;
116: struct sshbuf *output;
117: struct sshbuf *request;
1.280 djm 118: size_t nsession_ids;
119: struct hostkey_sid *session_ids;
1.1 deraadt 120: } SocketEntry;
121:
1.45 markus 122: u_int sockets_alloc = 0;
1.1 deraadt 123: SocketEntry *sockets = NULL;
124:
1.78 provos 125: typedef struct identity {
126: TAILQ_ENTRY(identity) next;
1.194 markus 127: struct sshkey *key;
1.21 markus 128: char *comment;
1.163 markus 129: char *provider;
1.174 dtucker 130: time_t death;
1.107 markus 131: u_int confirm;
1.238 djm 132: char *sk_provider;
1.281 djm 133: struct dest_constraint *dest_constraints;
134: size_t ndest_constraints;
1.1 deraadt 135: } Identity;
136:
1.221 djm 137: struct idtable {
1.33 markus 138: int nentries;
1.78 provos 139: TAILQ_HEAD(idqueue, identity) idlist;
1.221 djm 140: };
1.33 markus 141:
1.221 djm 142: /* private key table */
143: struct idtable *idtab;
1.1 deraadt 144:
145: int max_fd = 0;
146:
1.11 markus 147: /* pid of shell == parent of agent */
1.29 deraadt 148: pid_t parent_pid = -1;
1.176 dtucker 149: time_t parent_alive_interval = 0;
1.10 markus 150:
1.187 djm 151: /* pid of process for which cleanup_socket is applicable */
152: pid_t cleanup_pid = 0;
153:
1.10 markus 154: /* pathname and directory for AUTH_SOCKET */
1.196 deraadt 155: char socket_name[PATH_MAX];
156: char socket_dir[PATH_MAX];
1.10 markus 157:
1.260 djm 158: /* Pattern-list of allowed PKCS#11/Security key paths */
159: static char *allowed_providers;
1.215 djm 160:
1.88 markus 161: /* locking */
1.203 dtucker 162: #define LOCK_SIZE 32
163: #define LOCK_SALT_SIZE 16
164: #define LOCK_ROUNDS 1
1.88 markus 165: int locked = 0;
1.213 djm 166: u_char lock_pwhash[LOCK_SIZE];
167: u_char lock_salt[LOCK_SALT_SIZE];
1.88 markus 168:
1.20 markus 169: extern char *__progname;
170:
1.174 dtucker 171: /* Default lifetime in seconds (0 == forever) */
1.268 dtucker 172: static int lifetime = 0;
1.106 marc 173:
1.192 djm 174: static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
175:
1.258 djm 176: /* Refuse signing of non-SSH messages for web-origin FIDO keys */
177: static int restrict_websafe = 1;
178:
1.55 itojun 179: static void
1.101 stevesk 180: close_socket(SocketEntry *e)
181: {
1.280 djm 182: size_t i;
183:
1.101 stevesk 184: close(e->fd);
1.194 markus 185: sshbuf_free(e->input);
186: sshbuf_free(e->output);
187: sshbuf_free(e->request);
1.280 djm 188: for (i = 0; i < e->nsession_ids; i++) {
189: sshkey_free(e->session_ids[i].key);
190: sshbuf_free(e->session_ids[i].sid);
191: }
192: free(e->session_ids);
1.269 djm 193: memset(e, '\0', sizeof(*e));
194: e->fd = -1;
195: e->type = AUTH_UNUSED;
1.101 stevesk 196: }
197:
198: static void
1.33 markus 199: idtab_init(void)
1.1 deraadt 200: {
1.221 djm 201: idtab = xcalloc(1, sizeof(*idtab));
202: TAILQ_INIT(&idtab->idlist);
203: idtab->nentries = 0;
1.33 markus 204: }
205:
1.89 markus 206: static void
1.281 djm 207: free_dest_constraint_hop(struct dest_constraint_hop *dch)
208: {
209: u_int i;
210:
211: if (dch == NULL)
212: return;
213: free(dch->user);
214: free(dch->hostname);
215: for (i = 0; i < dch->nkeys; i++)
216: sshkey_free(dch->keys[i]);
217: free(dch->keys);
218: free(dch->key_is_ca);
219: }
220:
221: static void
222: free_dest_constraints(struct dest_constraint *dcs, size_t ndcs)
223: {
224: size_t i;
225:
226: for (i = 0; i < ndcs; i++) {
227: free_dest_constraint_hop(&dcs[i].from);
228: free_dest_constraint_hop(&dcs[i].to);
229: }
230: free(dcs);
231: }
232:
233: static void
1.89 markus 234: free_identity(Identity *id)
235: {
1.194 markus 236: sshkey_free(id->key);
1.173 djm 237: free(id->provider);
238: free(id->comment);
1.238 djm 239: free(id->sk_provider);
1.281 djm 240: free_dest_constraints(id->dest_constraints, id->ndest_constraints);
1.173 djm 241: free(id);
1.89 markus 242: }
243:
1.281 djm 244: /*
245: * Match 'key' against the key/CA list in a destination constraint hop
246: * Returns 0 on success or -1 otherwise.
247: */
248: static int
249: match_key_hop(const char *tag, const struct sshkey *key,
250: const struct dest_constraint_hop *dch)
251: {
252: const char *reason = NULL;
253: u_int i;
254: char *fp;
255:
256: if (key == NULL)
257: return -1;
258: /* XXX logspam */
259: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
260: SSH_FP_DEFAULT)) == NULL)
261: fatal_f("fingerprint failed");
262: debug3_f("%s: entering hostname %s, requested key %s %s, %u keys avail",
263: tag, dch->hostname, sshkey_type(key), fp, dch->nkeys);
264: free(fp);
265: for (i = 0; i < dch->nkeys; i++) {
266: if (dch->keys[i] == NULL)
267: return -1;
268: /* XXX logspam */
269: if ((fp = sshkey_fingerprint(dch->keys[i], SSH_FP_HASH_DEFAULT,
270: SSH_FP_DEFAULT)) == NULL)
271: fatal_f("fingerprint failed");
272: debug3_f("%s: key %u: %s%s %s", tag, i,
273: dch->key_is_ca[i] ? "CA " : "",
274: sshkey_type(dch->keys[i]), fp);
275: free(fp);
276: if (!sshkey_is_cert(key)) {
277: /* plain key */
278: if (dch->key_is_ca[i] ||
279: !sshkey_equal(key, dch->keys[i]))
280: continue;
281: return 0;
282: }
283: /* certificate */
284: if (!dch->key_is_ca[i])
285: continue;
286: if (key->cert == NULL || key->cert->signature_key == NULL)
287: return -1; /* shouldn't happen */
288: if (!sshkey_equal(key->cert->signature_key, dch->keys[i]))
289: continue;
290: if (sshkey_cert_check_host(key, dch->hostname, 1,
291: SSH_ALLOWED_CA_SIGALGS, &reason) != 0) {
292: debug_f("cert %s / hostname %s rejected: %s",
293: key->cert->key_id, dch->hostname, reason);
294: continue;
295: }
296: return 0;
297: }
298: return -1;
299: }
300:
301: /* Check destination constraints on an identity against the hostkey/user */
302: static int
303: permitted_by_dest_constraints(const struct sshkey *fromkey,
304: const struct sshkey *tokey, Identity *id, const char *user,
305: const char **hostnamep)
306: {
307: size_t i;
308: struct dest_constraint *d;
309:
310: if (hostnamep != NULL)
311: *hostnamep = NULL;
312: for (i = 0; i < id->ndest_constraints; i++) {
313: d = id->dest_constraints + i;
314: /* XXX remove logspam */
315: debug2_f("constraint %zu %s%s%s (%u keys) > %s%s%s (%u keys)",
316: i, d->from.user ? d->from.user : "",
317: d->from.user ? "@" : "",
318: d->from.hostname ? d->from.hostname : "(ORIGIN)",
319: d->from.nkeys,
320: d->to.user ? d->to.user : "", d->to.user ? "@" : "",
321: d->to.hostname ? d->to.hostname : "(ANY)", d->to.nkeys);
322:
323: /* Match 'from' key */
324: if (fromkey == NULL) {
325: /* We are matching the first hop */
326: if (d->from.hostname != NULL || d->from.nkeys != 0)
327: continue;
328: } else if (match_key_hop("from", fromkey, &d->from) != 0)
329: continue;
330:
331: /* Match 'to' key */
332: if (tokey != NULL && match_key_hop("to", tokey, &d->to) != 0)
333: continue;
334:
335: /* Match user if specified */
336: if (d->to.user != NULL && user != NULL &&
337: !match_pattern(user, d->to.user))
338: continue;
339:
340: /* successfully matched this constraint */
341: if (hostnamep != NULL)
342: *hostnamep = d->to.hostname;
343: debug2_f("allowed for hostname %s",
344: d->to.hostname == NULL ? "*" : d->to.hostname);
345: return 0;
346: }
347: /* no match */
348: debug2_f("%s identity \"%s\" not permitted for this destination",
349: sshkey_type(id->key), id->comment);
350: return -1;
351: }
352:
353: /*
354: * Check whether hostkeys on a SocketEntry and the optionally specified user
355: * are permitted by the destination constraints on the Identity.
356: * Returns 0 on success or -1 otherwise.
357: */
358: static int
359: identity_permitted(Identity *id, SocketEntry *e, char *user,
360: const char **forward_hostnamep, const char **last_hostnamep)
361: {
362: size_t i;
363: const char **hp;
364: struct hostkey_sid *hks;
365: const struct sshkey *fromkey = NULL;
366: const char *test_user;
367: char *fp1, *fp2;
368:
369: /* XXX remove logspam */
370: debug3_f("entering: key %s comment \"%s\", %zu socket bindings, "
371: "%zu constraints", sshkey_type(id->key), id->comment,
372: e->nsession_ids, id->ndest_constraints);
373: if (id->ndest_constraints == 0)
374: return 0; /* unconstrained */
375: if (e->nsession_ids == 0)
376: return 0; /* local use */
377: /*
378: * Walk through the hops recorded by session_id and try to find a
379: * constraint that satisfies each.
380: */
381: for (i = 0; i < e->nsession_ids; i++) {
382: hks = e->session_ids + i;
383: if (hks->key == NULL)
384: fatal_f("internal error: no bound key");
385: /* XXX remove logspam */
386: fp1 = fp2 = NULL;
387: if (fromkey != NULL &&
388: (fp1 = sshkey_fingerprint(fromkey, SSH_FP_HASH_DEFAULT,
389: SSH_FP_DEFAULT)) == NULL)
390: fatal_f("fingerprint failed");
391: if ((fp2 = sshkey_fingerprint(hks->key, SSH_FP_HASH_DEFAULT,
392: SSH_FP_DEFAULT)) == NULL)
393: fatal_f("fingerprint failed");
394: debug3_f("socketentry fd=%d, entry %zu %s, "
395: "from hostkey %s %s to user %s hostkey %s %s",
396: e->fd, i, hks->forwarded ? "FORWARD" : "AUTH",
397: fromkey ? sshkey_type(fromkey) : "(ORIGIN)",
398: fromkey ? fp1 : "", user ? user : "(ANY)",
399: sshkey_type(hks->key), fp2);
400: free(fp1);
401: free(fp2);
402: /*
403: * Record the hostnames for the initial forwarding and
404: * the final destination.
405: */
406: hp = NULL;
407: if (i == e->nsession_ids - 1)
408: hp = last_hostnamep;
409: else if (i == 0)
410: hp = forward_hostnamep;
411: /* Special handling for final recorded binding */
412: test_user = NULL;
413: if (i == e->nsession_ids - 1) {
414: /* Can only check user at final hop */
415: test_user = user;
416: /*
417: * user is only presented for signature requests.
418: * If this is the case, make sure last binding is not
419: * for a forwarding.
420: */
421: if (hks->forwarded && user != NULL) {
422: error_f("tried to sign on forwarding hop");
423: return -1;
424: }
425: } else if (!hks->forwarded) {
426: error_f("tried to forward though signing bind");
427: return -1;
428: }
429: if (permitted_by_dest_constraints(fromkey, hks->key, id,
430: test_user, hp) != 0)
431: return -1;
432: fromkey = hks->key;
433: }
434: /*
435: * Another special case: if the last bound session ID was for a
436: * forwarding, and this function is not being called to check a sign
437: * request (i.e. no 'user' supplied), then only permit the key if
438: * there is a permission that would allow it to be used at another
439: * destination. This hides keys that are allowed to be used to
1.284 jsg 440: * authenticate *to* a host but not permitted for *use* beyond it.
1.281 djm 441: */
442: hks = &e->session_ids[e->nsession_ids - 1];
443: if (hks->forwarded && user == NULL &&
444: permitted_by_dest_constraints(hks->key, NULL, id,
445: NULL, NULL) != 0) {
446: debug3_f("key permitted at host but not after");
447: return -1;
448: }
449:
450: /* success */
451: return 0;
452: }
453:
1.33 markus 454: /* return matching private key for given public key */
1.78 provos 455: static Identity *
1.221 djm 456: lookup_identity(struct sshkey *key)
1.33 markus 457: {
1.78 provos 458: Identity *id;
459:
1.221 djm 460: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.194 markus 461: if (sshkey_equal(key, id->key))
1.78 provos 462: return (id);
1.33 markus 463: }
1.78 provos 464: return (NULL);
465: }
466:
1.107 markus 467: /* Check confirmation of keysign request */
468: static int
1.270 djm 469: confirm_key(Identity *id, const char *extra)
1.107 markus 470: {
1.122 djm 471: char *p;
1.107 markus 472: int ret = -1;
473:
1.194 markus 474: p = sshkey_fingerprint(id->key, fingerprint_hash, SSH_FP_DEFAULT);
1.197 djm 475: if (p != NULL &&
1.270 djm 476: ask_permission("Allow use of key %s?\nKey fingerprint %s.%s%s",
477: id->comment, p,
478: extra == NULL ? "" : "\n", extra == NULL ? "" : extra))
1.122 djm 479: ret = 0;
1.173 djm 480: free(p);
1.122 djm 481:
1.107 markus 482: return (ret);
483: }
484:
1.194 markus 485: static void
486: send_status(SocketEntry *e, int success)
487: {
488: int r;
489:
490: if ((r = sshbuf_put_u32(e->output, 1)) != 0 ||
491: (r = sshbuf_put_u8(e->output, success ?
492: SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
1.266 djm 493: fatal_fr(r, "compose");
1.194 markus 494: }
495:
1.33 markus 496: /* send list of supported public keys to 'client' */
1.55 itojun 497: static void
1.221 djm 498: process_request_identities(SocketEntry *e)
1.33 markus 499: {
1.96 deraadt 500: Identity *id;
1.281 djm 501: struct sshbuf *msg, *keys;
1.194 markus 502: int r;
1.281 djm 503: u_int nentries = 0;
1.1 deraadt 504:
1.269 djm 505: debug2_f("entering");
506:
1.281 djm 507: if ((msg = sshbuf_new()) == NULL || (keys = sshbuf_new()) == NULL)
1.266 djm 508: fatal_f("sshbuf_new failed");
1.221 djm 509: TAILQ_FOREACH(id, &idtab->idlist, next) {
1.281 djm 510: /* identity not visible, don't include in response */
511: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
512: continue;
513: if ((r = sshkey_puts_opts(id->key, keys,
1.278 djm 514: SSHKEY_SERIALIZE_INFO)) != 0 ||
1.281 djm 515: (r = sshbuf_put_cstring(keys, id->comment)) != 0) {
1.266 djm 516: error_fr(r, "compose key/comment");
1.220 djm 517: continue;
1.33 markus 518: }
1.281 djm 519: nentries++;
1.21 markus 520: }
1.281 djm 521: debug2_f("replying with %u allowed of %u available keys",
522: nentries, idtab->nentries);
523: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
524: (r = sshbuf_put_u32(msg, nentries)) != 0 ||
525: (r = sshbuf_putb(msg, keys)) != 0)
526: fatal_fr(r, "compose");
1.194 markus 527: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 528: fatal_fr(r, "enqueue");
1.194 markus 529: sshbuf_free(msg);
1.281 djm 530: sshbuf_free(keys);
1.1 deraadt 531: }
532:
1.33 markus 533:
1.208 markus 534: static char *
535: agent_decode_alg(struct sshkey *key, u_int flags)
536: {
537: if (key->type == KEY_RSA) {
538: if (flags & SSH_AGENT_RSA_SHA2_256)
539: return "rsa-sha2-256";
540: else if (flags & SSH_AGENT_RSA_SHA2_512)
541: return "rsa-sha2-512";
1.235 djm 542: } else if (key->type == KEY_RSA_CERT) {
543: if (flags & SSH_AGENT_RSA_SHA2_256)
544: return "rsa-sha2-256-cert-v01@openssh.com";
545: else if (flags & SSH_AGENT_RSA_SHA2_512)
546: return "rsa-sha2-512-cert-v01@openssh.com";
1.208 markus 547: }
548: return NULL;
549: }
550:
1.258 djm 551: /*
1.270 djm 552: * Attempt to parse the contents of a buffer as a SSH publickey userauth
553: * request, checking its contents for consistency and matching the embedded
554: * key against the one that is being used for signing.
555: * Note: does not modify msg buffer.
1.282 djm 556: * Optionally extract the username, session ID and/or hostkey from the request.
1.258 djm 557: */
558: static int
1.270 djm 559: parse_userauth_request(struct sshbuf *msg, const struct sshkey *expected_key,
1.282 djm 560: char **userp, struct sshbuf **sess_idp, struct sshkey **hostkeyp)
1.258 djm 561: {
1.270 djm 562: struct sshbuf *b = NULL, *sess_id = NULL;
563: char *user = NULL, *service = NULL, *method = NULL, *pkalg = NULL;
1.258 djm 564: int r;
1.270 djm 565: u_char t, sig_follows;
1.282 djm 566: struct sshkey *mkey = NULL, *hostkey = NULL;
1.258 djm 567:
1.270 djm 568: if (userp != NULL)
569: *userp = NULL;
570: if (sess_idp != NULL)
571: *sess_idp = NULL;
1.282 djm 572: if (hostkeyp != NULL)
573: *hostkeyp = NULL;
1.270 djm 574: if ((b = sshbuf_fromb(msg)) == NULL)
575: fatal_f("sshbuf_fromb");
1.258 djm 576:
577: /* SSH userauth request */
1.270 djm 578: if ((r = sshbuf_froms(b, &sess_id)) != 0)
579: goto out;
580: if (sshbuf_len(sess_id) == 0) {
581: r = SSH_ERR_INVALID_FORMAT;
582: goto out;
583: }
584: if ((r = sshbuf_get_u8(b, &t)) != 0 || /* SSH2_MSG_USERAUTH_REQUEST */
585: (r = sshbuf_get_cstring(b, &user, NULL)) != 0 || /* server user */
586: (r = sshbuf_get_cstring(b, &service, NULL)) != 0 || /* service */
587: (r = sshbuf_get_cstring(b, &method, NULL)) != 0 || /* method */
588: (r = sshbuf_get_u8(b, &sig_follows)) != 0 || /* sig-follows */
589: (r = sshbuf_get_cstring(b, &pkalg, NULL)) != 0 || /* alg */
590: (r = sshkey_froms(b, &mkey)) != 0) /* key */
591: goto out;
592: if (t != SSH2_MSG_USERAUTH_REQUEST ||
593: sig_follows != 1 ||
594: strcmp(service, "ssh-connection") != 0 ||
595: !sshkey_equal(expected_key, mkey) ||
596: sshkey_type_from_name(pkalg) != expected_key->type) {
597: r = SSH_ERR_INVALID_FORMAT;
598: goto out;
599: }
1.282 djm 600: if (strcmp(method, "publickey-hostbound-v00@openssh.com") == 0) {
601: if ((r = sshkey_froms(b, &hostkey)) != 0)
602: goto out;
603: } else if (strcmp(method, "publickey") != 0) {
1.270 djm 604: r = SSH_ERR_INVALID_FORMAT;
605: goto out;
606: }
607: if (sshbuf_len(b) != 0) {
608: r = SSH_ERR_INVALID_FORMAT;
609: goto out;
610: }
611: /* success */
612: r = 0;
613: debug3_f("well formed userauth");
614: if (userp != NULL) {
615: *userp = user;
616: user = NULL;
617: }
618: if (sess_idp != NULL) {
619: *sess_idp = sess_id;
620: sess_id = NULL;
1.258 djm 621: }
1.282 djm 622: if (hostkeyp != NULL) {
623: *hostkeyp = hostkey;
624: hostkey = NULL;
625: }
1.270 djm 626: out:
627: sshbuf_free(b);
628: sshbuf_free(sess_id);
629: free(user);
630: free(service);
631: free(method);
632: free(pkalg);
1.258 djm 633: sshkey_free(mkey);
1.282 djm 634: sshkey_free(hostkey);
1.270 djm 635: return r;
636: }
637:
638: /*
639: * Attempt to parse the contents of a buffer as a SSHSIG signature request.
640: * Note: does not modify buffer.
641: */
642: static int
643: parse_sshsig_request(struct sshbuf *msg)
644: {
645: int r;
646: struct sshbuf *b;
647:
648: if ((b = sshbuf_fromb(msg)) == NULL)
649: fatal_f("sshbuf_fromb");
650:
651: if ((r = sshbuf_cmp(b, 0, "SSHSIG", 6)) != 0 ||
652: (r = sshbuf_consume(b, 6)) != 0 ||
653: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* namespace */
654: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0 || /* reserved */
655: (r = sshbuf_get_cstring(b, NULL, NULL)) != 0 || /* hashalg */
656: (r = sshbuf_get_string_direct(b, NULL, NULL)) != 0) /* H(msg) */
657: goto out;
658: if (sshbuf_len(b) != 0) {
659: r = SSH_ERR_INVALID_FORMAT;
660: goto out;
661: }
662: /* success */
663: r = 0;
664: out:
1.258 djm 665: sshbuf_free(b);
1.270 djm 666: return r;
667: }
668:
669: /*
670: * This function inspects a message to be signed by a FIDO key that has a
671: * web-like application string (i.e. one that does not begin with "ssh:".
672: * It checks that the message is one of those expected for SSH operations
673: * (pubkey userauth, sshsig, CA key signing) to exclude signing challenges
674: * for the web.
675: */
676: static int
677: check_websafe_message_contents(struct sshkey *key, struct sshbuf *data)
678: {
1.282 djm 679: if (parse_userauth_request(data, key, NULL, NULL, NULL) == 0) {
1.270 djm 680: debug_f("signed data matches public key userauth request");
1.258 djm 681: return 1;
682: }
1.270 djm 683: if (parse_sshsig_request(data) == 0) {
684: debug_f("signed data matches SSHSIG signature request");
1.258 djm 685: return 1;
1.270 djm 686: }
1.258 djm 687:
1.270 djm 688: /* XXX check CA signature operation */
1.258 djm 689:
690: error("web-origin key attempting to sign non-SSH message");
691: return 0;
692: }
693:
1.280 djm 694: static int
695: buf_equal(const struct sshbuf *a, const struct sshbuf *b)
696: {
697: if (sshbuf_ptr(a) == NULL || sshbuf_ptr(b) == NULL)
698: return SSH_ERR_INVALID_ARGUMENT;
699: if (sshbuf_len(a) != sshbuf_len(b))
700: return SSH_ERR_INVALID_FORMAT;
701: if (timingsafe_bcmp(sshbuf_ptr(a), sshbuf_ptr(b), sshbuf_len(a)) != 0)
702: return SSH_ERR_INVALID_FORMAT;
703: return 0;
704: }
705:
1.33 markus 706: /* ssh2 only */
1.55 itojun 707: static void
1.33 markus 708: process_sign_request2(SocketEntry *e)
709: {
1.221 djm 710: u_char *signature = NULL;
1.281 djm 711: size_t slen = 0;
1.194 markus 712: u_int compat = 0, flags;
1.247 djm 713: int r, ok = -1;
1.280 djm 714: char *fp = NULL, *user = NULL, *sig_dest = NULL;
1.281 djm 715: const char *fwd_host = NULL, *dest_host = NULL;
1.280 djm 716: struct sshbuf *msg = NULL, *data = NULL, *sid = NULL;
1.283 djm 717: struct sshkey *key = NULL, *hostkey = NULL;
1.195 djm 718: struct identity *id;
1.251 djm 719: struct notifier_ctx *notifier = NULL;
1.194 markus 720:
1.270 djm 721: debug_f("entering");
722:
1.273 dtucker 723: if ((msg = sshbuf_new()) == NULL || (data = sshbuf_new()) == NULL)
1.266 djm 724: fatal_f("sshbuf_new failed");
1.221 djm 725: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1.270 djm 726: (r = sshbuf_get_stringb(e->request, data)) != 0 ||
1.225 djm 727: (r = sshbuf_get_u32(e->request, &flags)) != 0) {
1.266 djm 728: error_fr(r, "parse");
1.225 djm 729: goto send;
730: }
731:
1.221 djm 732: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 733: verbose_f("%s key not found", sshkey_type(key));
1.195 djm 734: goto send;
735: }
1.281 djm 736: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
737: SSH_FP_DEFAULT)) == NULL)
738: fatal_f("fingerprint failed");
739:
740: if (id->ndest_constraints != 0) {
741: if (e->nsession_ids == 0) {
742: logit_f("refusing use of destination-constrained key "
743: "to sign on unbound connection");
744: goto send;
745: }
1.283 djm 746: if (parse_userauth_request(data, key, &user, &sid,
747: &hostkey) != 0) {
1.281 djm 748: logit_f("refusing use of destination-constrained key "
749: "to sign an unidentified signature");
750: goto send;
751: }
752: /* XXX logspam */
753: debug_f("user=%s", user);
754: if (identity_permitted(id, e, user, &fwd_host, &dest_host) != 0)
755: goto send;
756: /* XXX display fwd_host/dest_host in askpass UI */
1.280 djm 757: /*
1.281 djm 758: * Ensure that the session ID is the most recent one
759: * registered on the socket - it should have been bound by
760: * ssh immediately before userauth.
1.280 djm 761: */
1.281 djm 762: if (buf_equal(sid,
763: e->session_ids[e->nsession_ids - 1].sid) != 0) {
764: error_f("unexpected session ID (%zu listed) on "
765: "signature request for target user %s with "
766: "key %s %s", e->nsession_ids, user,
767: sshkey_type(id->key), fp);
768: goto send;
1.280 djm 769: }
1.283 djm 770: /*
771: * Ensure that the hostkey embedded in the signature matches
772: * the one most recently bound to the socket. An exception is
773: * made for the initial forwarding hop.
774: */
775: if (e->nsession_ids > 1 && hostkey == NULL) {
776: error_f("refusing use of destination-constrained key: "
777: "no hostkey recorded in signature for forwarded "
778: "connection");
779: goto send;
780: }
781: if (hostkey != NULL && !sshkey_equal(hostkey,
782: e->session_ids[e->nsession_ids - 1].key)) {
783: error_f("refusing use of destination-constrained key: "
784: "mismatch between hostkey in request and most "
785: "recently bound session");
786: goto send;
787: }
1.281 djm 788: xasprintf(&sig_dest, "public key authentication request for "
789: "user \"%s\" to listed host", user);
1.280 djm 790: }
791: if (id->confirm && confirm_key(id, sig_dest) != 0) {
1.266 djm 792: verbose_f("user refused key");
1.195 djm 793: goto send;
794: }
1.258 djm 795: if (sshkey_is_sk(id->key)) {
796: if (strncmp(id->key->sk_application, "ssh:", 4) != 0 &&
1.270 djm 797: !check_websafe_message_contents(key, data)) {
1.258 djm 798: /* error already logged */
799: goto send;
800: }
801: if ((id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
802: notifier = notify_start(0,
1.280 djm 803: "Confirm user presence for key %s %s%s%s",
804: sshkey_type(id->key), fp,
805: sig_dest == NULL ? "" : "\n",
806: sig_dest == NULL ? "" : sig_dest);
1.258 djm 807: }
1.251 djm 808: }
1.263 djm 809: /* XXX support PIN required FIDO keys */
1.251 djm 810: if ((r = sshkey_sign(id->key, &signature, &slen,
1.270 djm 811: sshbuf_ptr(data), sshbuf_len(data), agent_decode_alg(key, flags),
1.263 djm 812: id->sk_provider, NULL, compat)) != 0) {
1.266 djm 813: error_fr(r, "sshkey_sign");
1.251 djm 814: goto send;
1.33 markus 815: }
1.195 djm 816: /* Success */
817: ok = 0;
818: send:
1.267 djm 819: notify_complete(notifier, "User presence confirmed");
1.270 djm 820:
1.33 markus 821: if (ok == 0) {
1.194 markus 822: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
823: (r = sshbuf_put_string(msg, signature, slen)) != 0)
1.266 djm 824: fatal_fr(r, "compose");
1.194 markus 825: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
1.266 djm 826: fatal_fr(r, "compose failure");
1.194 markus 827:
828: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 829: fatal_fr(r, "enqueue");
1.194 markus 830:
1.280 djm 831: sshbuf_free(sid);
1.270 djm 832: sshbuf_free(data);
1.194 markus 833: sshbuf_free(msg);
1.270 djm 834: sshkey_free(key);
1.283 djm 835: sshkey_free(hostkey);
1.270 djm 836: free(fp);
1.173 djm 837: free(signature);
1.280 djm 838: free(sig_dest);
839: free(user);
1.1 deraadt 840: }
841:
1.33 markus 842: /* shared */
1.55 itojun 843: static void
1.221 djm 844: process_remove_identity(SocketEntry *e)
1.1 deraadt 845: {
1.194 markus 846: int r, success = 0;
847: struct sshkey *key = NULL;
1.221 djm 848: Identity *id;
1.21 markus 849:
1.269 djm 850: debug2_f("entering");
1.221 djm 851: if ((r = sshkey_froms(e->request, &key)) != 0) {
1.266 djm 852: error_fr(r, "parse key");
1.221 djm 853: goto done;
854: }
855: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 856: debug_f("key not found");
1.221 djm 857: goto done;
858: }
1.281 djm 859: /* identity not visible, cannot be removed */
860: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
861: goto done; /* error already logged */
1.221 djm 862: /* We have this key, free it. */
863: if (idtab->nentries < 1)
1.266 djm 864: fatal_f("internal error: nentries %d", idtab->nentries);
1.221 djm 865: TAILQ_REMOVE(&idtab->idlist, id, next);
866: free_identity(id);
867: idtab->nentries--;
868: success = 1;
869: done:
1.276 djm 870: sshkey_free(key);
1.194 markus 871: send_status(e, success);
1.1 deraadt 872: }
873:
1.55 itojun 874: static void
1.221 djm 875: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 876: {
1.78 provos 877: Identity *id;
1.21 markus 878:
1.269 djm 879: debug2_f("entering");
1.21 markus 880: /* Loop over all identities and clear the keys. */
1.221 djm 881: for (id = TAILQ_FIRST(&idtab->idlist); id;
882: id = TAILQ_FIRST(&idtab->idlist)) {
883: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 884: free_identity(id);
1.21 markus 885: }
886:
887: /* Mark that there are no identities. */
1.221 djm 888: idtab->nentries = 0;
1.21 markus 889:
890: /* Send success. */
1.194 markus 891: send_status(e, 1);
1.1 deraadt 892: }
893:
1.155 dtucker 894: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 895: static time_t
1.89 markus 896: reaper(void)
897: {
1.175 dtucker 898: time_t deadline = 0, now = monotime();
1.89 markus 899: Identity *id, *nxt;
900:
1.221 djm 901: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
902: nxt = TAILQ_NEXT(id, next);
903: if (id->death == 0)
904: continue;
905: if (now >= id->death) {
906: debug("expiring key '%s'", id->comment);
907: TAILQ_REMOVE(&idtab->idlist, id, next);
908: free_identity(id);
909: idtab->nentries--;
910: } else
911: deadline = (deadline == 0) ? id->death :
912: MINIMUM(deadline, id->death);
1.89 markus 913: }
1.155 dtucker 914: if (deadline == 0 || deadline <= now)
915: return 0;
916: else
917: return (deadline - now);
1.89 markus 918: }
919:
1.271 djm 920: static int
1.281 djm 921: parse_dest_constraint_hop(struct sshbuf *b, struct dest_constraint_hop *dch)
922: {
923: u_char key_is_ca;
924: size_t elen = 0;
925: int r;
926: struct sshkey *k = NULL;
927: char *fp;
928:
929: memset(dch, '\0', sizeof(*dch));
930: if ((r = sshbuf_get_cstring(b, &dch->user, NULL)) != 0 ||
931: (r = sshbuf_get_cstring(b, &dch->hostname, NULL)) != 0 ||
932: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
933: error_fr(r, "parse");
934: goto out;
935: }
936: if (elen != 0) {
937: error_f("unsupported extensions (len %zu)", elen);
938: r = SSH_ERR_FEATURE_UNSUPPORTED;
939: goto out;
940: }
941: if (*dch->hostname == '\0') {
942: free(dch->hostname);
943: dch->hostname = NULL;
944: }
945: if (*dch->user == '\0') {
946: free(dch->user);
947: dch->user = NULL;
948: }
949: while (sshbuf_len(b) != 0) {
950: dch->keys = xrecallocarray(dch->keys, dch->nkeys,
951: dch->nkeys + 1, sizeof(*dch->keys));
952: dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys,
953: dch->nkeys + 1, sizeof(*dch->key_is_ca));
954: if ((r = sshkey_froms(b, &k)) != 0 ||
955: (r = sshbuf_get_u8(b, &key_is_ca)) != 0)
956: goto out;
957: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
958: SSH_FP_DEFAULT)) == NULL)
959: fatal_f("fingerprint failed");
960: debug3_f("%s%s%s: adding %skey %s %s",
961: dch->user == NULL ? "" : dch->user,
962: dch->user == NULL ? "" : "@",
963: dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp);
964: free(fp);
965: dch->keys[dch->nkeys] = k;
966: dch->key_is_ca[dch->nkeys] = key_is_ca != 0;
967: dch->nkeys++;
968: k = NULL; /* transferred */
969: }
970: /* success */
971: r = 0;
972: out:
973: sshkey_free(k);
974: return r;
975: }
976:
977: static int
978: parse_dest_constraint(struct sshbuf *m, struct dest_constraint *dc)
979: {
980: struct sshbuf *b = NULL, *frombuf = NULL, *tobuf = NULL;
981: int r;
982: size_t elen = 0;
983:
984: debug3_f("entering");
985:
986: memset(dc, '\0', sizeof(*dc));
987: if ((r = sshbuf_froms(m, &b)) != 0 ||
988: (r = sshbuf_froms(b, &frombuf)) != 0 ||
989: (r = sshbuf_froms(b, &tobuf)) != 0 ||
990: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
991: error_fr(r, "parse");
992: goto out;
993: }
994: if ((r = parse_dest_constraint_hop(frombuf, &dc->from) != 0) ||
995: (r = parse_dest_constraint_hop(tobuf, &dc->to) != 0))
996: goto out; /* already logged */
997: if (elen != 0) {
998: error_f("unsupported extensions (len %zu)", elen);
999: r = SSH_ERR_FEATURE_UNSUPPORTED;
1000: goto out;
1001: }
1002: debug2_f("parsed %s (%u keys) > %s%s%s (%u keys)",
1003: dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys,
1004: dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "",
1005: dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys);
1006: /* check consistency */
1007: if ((dc->from.hostname == NULL) != (dc->from.nkeys == 0) ||
1008: dc->from.user != NULL) {
1009: error_f("inconsistent \"from\" specification");
1010: r = SSH_ERR_INVALID_FORMAT;
1011: goto out;
1012: }
1013: if (dc->to.hostname == NULL || dc->to.nkeys == 0) {
1014: error_f("incomplete \"to\" specification");
1015: r = SSH_ERR_INVALID_FORMAT;
1016: goto out;
1017: }
1018: /* success */
1019: r = 0;
1020: out:
1021: sshbuf_free(b);
1022: sshbuf_free(frombuf);
1023: sshbuf_free(tobuf);
1024: return r;
1025: }
1026:
1027: static int
1028: parse_key_constraint_extension(struct sshbuf *m, char **sk_providerp,
1029: struct dest_constraint **dcsp, size_t *ndcsp)
1.277 djm 1030: {
1031: char *ext_name = NULL;
1032: int r;
1.281 djm 1033: struct sshbuf *b = NULL;
1.277 djm 1034:
1035: if ((r = sshbuf_get_cstring(m, &ext_name, NULL)) != 0) {
1036: error_fr(r, "parse constraint extension");
1037: goto out;
1038: }
1039: debug_f("constraint ext %s", ext_name);
1040: if (strcmp(ext_name, "sk-provider@openssh.com") == 0) {
1041: if (sk_providerp == NULL) {
1042: error_f("%s not valid here", ext_name);
1043: r = SSH_ERR_INVALID_FORMAT;
1044: goto out;
1045: }
1046: if (*sk_providerp != NULL) {
1047: error_f("%s already set", ext_name);
1048: r = SSH_ERR_INVALID_FORMAT;
1049: goto out;
1050: }
1051: if ((r = sshbuf_get_cstring(m, sk_providerp, NULL)) != 0) {
1052: error_fr(r, "parse %s", ext_name);
1053: goto out;
1054: }
1.281 djm 1055: } else if (strcmp(ext_name,
1056: "restrict-destination-v00@openssh.com") == 0) {
1057: if (*dcsp != NULL) {
1058: error_f("%s already set", ext_name);
1059: goto out;
1060: }
1061: if ((r = sshbuf_froms(m, &b)) != 0) {
1062: error_fr(r, "parse %s outer", ext_name);
1063: goto out;
1064: }
1065: while (sshbuf_len(b) != 0) {
1066: if (*ndcsp >= AGENT_MAX_DEST_CONSTRAINTS) {
1067: error_f("too many %s constraints", ext_name);
1068: goto out;
1069: }
1070: *dcsp = xrecallocarray(*dcsp, *ndcsp, *ndcsp + 1,
1071: sizeof(**dcsp));
1072: if ((r = parse_dest_constraint(b,
1073: *dcsp + (*ndcsp)++)) != 0)
1074: goto out; /* error already logged */
1075: }
1.277 djm 1076: } else {
1077: error_f("unsupported constraint \"%s\"", ext_name);
1078: r = SSH_ERR_FEATURE_UNSUPPORTED;
1079: goto out;
1080: }
1081: /* success */
1082: r = 0;
1083: out:
1084: free(ext_name);
1.281 djm 1085: sshbuf_free(b);
1.277 djm 1086: return r;
1087: }
1088:
1089: static int
1.271 djm 1090: parse_key_constraints(struct sshbuf *m, struct sshkey *k, time_t *deathp,
1.281 djm 1091: u_int *secondsp, int *confirmp, char **sk_providerp,
1092: struct dest_constraint **dcsp, size_t *ndcsp)
1.1 deraadt 1093: {
1.194 markus 1094: u_char ctype;
1.271 djm 1095: int r;
1096: u_int seconds, maxsign = 0;
1.33 markus 1097:
1.271 djm 1098: while (sshbuf_len(m)) {
1099: if ((r = sshbuf_get_u8(m, &ctype)) != 0) {
1.266 djm 1100: error_fr(r, "parse constraint type");
1.277 djm 1101: goto out;
1.194 markus 1102: }
1103: switch (ctype) {
1.94 markus 1104: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.271 djm 1105: if (*deathp != 0) {
1106: error_f("lifetime already set");
1.277 djm 1107: r = SSH_ERR_INVALID_FORMAT;
1108: goto out;
1.271 djm 1109: }
1110: if ((r = sshbuf_get_u32(m, &seconds)) != 0) {
1.266 djm 1111: error_fr(r, "parse lifetime constraint");
1.277 djm 1112: goto out;
1.194 markus 1113: }
1.271 djm 1114: *deathp = monotime() + seconds;
1115: *secondsp = seconds;
1.94 markus 1116: break;
1.107 markus 1117: case SSH_AGENT_CONSTRAIN_CONFIRM:
1.271 djm 1118: if (*confirmp != 0) {
1119: error_f("confirm already set");
1.277 djm 1120: r = SSH_ERR_INVALID_FORMAT;
1121: goto out;
1.271 djm 1122: }
1123: *confirmp = 1;
1.107 markus 1124: break;
1.228 markus 1125: case SSH_AGENT_CONSTRAIN_MAXSIGN:
1.271 djm 1126: if (k == NULL) {
1127: error_f("maxsign not valid here");
1.277 djm 1128: r = SSH_ERR_INVALID_FORMAT;
1129: goto out;
1.271 djm 1130: }
1131: if (maxsign != 0) {
1132: error_f("maxsign already set");
1.277 djm 1133: r = SSH_ERR_INVALID_FORMAT;
1134: goto out;
1.271 djm 1135: }
1136: if ((r = sshbuf_get_u32(m, &maxsign)) != 0) {
1.266 djm 1137: error_fr(r, "parse maxsign constraint");
1.277 djm 1138: goto out;
1.228 markus 1139: }
1140: if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) {
1.266 djm 1141: error_fr(r, "enable maxsign");
1.277 djm 1142: goto out;
1.228 markus 1143: }
1144: break;
1.238 djm 1145: case SSH_AGENT_CONSTRAIN_EXTENSION:
1.277 djm 1146: if ((r = parse_key_constraint_extension(m,
1.281 djm 1147: sk_providerp, dcsp, ndcsp)) != 0)
1.277 djm 1148: goto out; /* error already logged */
1.238 djm 1149: break;
1.94 markus 1150: default:
1.266 djm 1151: error_f("Unknown constraint %d", ctype);
1.277 djm 1152: r = SSH_ERR_FEATURE_UNSUPPORTED;
1153: goto out;
1.94 markus 1154: }
1155: }
1.271 djm 1156: /* success */
1.277 djm 1157: r = 0;
1158: out:
1159: return r;
1.271 djm 1160: }
1161:
1162: static void
1163: process_add_identity(SocketEntry *e)
1164: {
1165: Identity *id;
1166: int success = 0, confirm = 0;
1.272 dtucker 1167: char *fp, *comment = NULL, *sk_provider = NULL;
1.271 djm 1168: char canonical_provider[PATH_MAX];
1169: time_t death = 0;
1170: u_int seconds = 0;
1.281 djm 1171: struct dest_constraint *dest_constraints = NULL;
1172: size_t ndest_constraints = 0;
1.271 djm 1173: struct sshkey *k = NULL;
1174: int r = SSH_ERR_INTERNAL_ERROR;
1175:
1176: debug2_f("entering");
1177: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
1178: k == NULL ||
1179: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
1180: error_fr(r, "parse");
1181: goto out;
1182: }
1183: if (parse_key_constraints(e->request, k, &death, &seconds, &confirm,
1.281 djm 1184: &sk_provider, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1185: error_f("failed to parse constraints");
1186: sshbuf_reset(e->request);
1187: goto out;
1188: }
1189:
1.238 djm 1190: if (sk_provider != NULL) {
1.240 markus 1191: if (!sshkey_is_sk(k)) {
1.255 naddy 1192: error("Cannot add provider: %s is not an "
1193: "authenticator-hosted key", sshkey_type(k));
1.271 djm 1194: goto out;
1.238 djm 1195: }
1.254 djm 1196: if (strcasecmp(sk_provider, "internal") == 0) {
1.266 djm 1197: debug_f("internal provider");
1.254 djm 1198: } else {
1199: if (realpath(sk_provider, canonical_provider) == NULL) {
1200: verbose("failed provider \"%.100s\": "
1201: "realpath: %s", sk_provider,
1202: strerror(errno));
1.271 djm 1203: goto out;
1.254 djm 1204: }
1.238 djm 1205: free(sk_provider);
1.254 djm 1206: sk_provider = xstrdup(canonical_provider);
1207: if (match_pattern_list(sk_provider,
1.260 djm 1208: allowed_providers, 0) != 1) {
1.254 djm 1209: error("Refusing add key: "
1.260 djm 1210: "provider %s not allowed", sk_provider);
1.271 djm 1211: goto out;
1.254 djm 1212: }
1.238 djm 1213: }
1.242 markus 1214: }
1215: if ((r = sshkey_shield_private(k)) != 0) {
1.266 djm 1216: error_fr(r, "shield private");
1.271 djm 1217: goto out;
1.238 djm 1218: }
1.106 marc 1219: if (lifetime && !death)
1.175 dtucker 1220: death = monotime() + lifetime;
1.221 djm 1221: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 1222: id = xcalloc(1, sizeof(Identity));
1.221 djm 1223: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 1224: /* Increment the number of identities. */
1.221 djm 1225: idtab->nentries++;
1.33 markus 1226: } else {
1.281 djm 1227: /* identity not visible, do not update */
1228: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
1229: goto out; /* error already logged */
1.228 markus 1230: /* key state might have been updated */
1231: sshkey_free(id->key);
1.173 djm 1232: free(id->comment);
1.238 djm 1233: free(id->sk_provider);
1.281 djm 1234: free_dest_constraints(id->dest_constraints,
1235: id->ndest_constraints);
1.33 markus 1236: }
1.271 djm 1237: /* success */
1.228 markus 1238: id->key = k;
1.157 canacar 1239: id->comment = comment;
1240: id->death = death;
1241: id->confirm = confirm;
1.238 djm 1242: id->sk_provider = sk_provider;
1.281 djm 1243: id->dest_constraints = dest_constraints;
1244: id->ndest_constraints = ndest_constraints;
1.238 djm 1245:
1246: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
1247: SSH_FP_DEFAULT)) == NULL)
1.266 djm 1248: fatal_f("sshkey_fingerprint failed");
1249: debug_f("add %s %s \"%.100s\" (life: %u) (confirm: %u) "
1.281 djm 1250: "(provider: %s) (destination constraints: %zu)",
1251: sshkey_ssh_name(k), fp, comment, seconds, confirm,
1252: sk_provider == NULL ? "none" : sk_provider, ndest_constraints);
1.238 djm 1253: free(fp);
1.271 djm 1254: /* transferred */
1255: k = NULL;
1256: comment = NULL;
1257: sk_provider = NULL;
1.281 djm 1258: dest_constraints = NULL;
1259: ndest_constraints = 0;
1.271 djm 1260: success = 1;
1261: out:
1262: free(sk_provider);
1263: free(comment);
1264: sshkey_free(k);
1.281 djm 1265: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1266: send_status(e, success);
1.1 deraadt 1267: }
1268:
1.88 markus 1269: /* XXX todo: encrypt sensitive data with passphrase */
1270: static void
1271: process_lock_agent(SocketEntry *e, int lock)
1272: {
1.203 dtucker 1273: int r, success = 0, delay;
1.213 djm 1274: char *passwd;
1275: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 1276: static u_int fail_count = 0;
1277: size_t pwlen;
1278:
1.269 djm 1279: debug2_f("entering");
1.226 djm 1280: /*
1281: * This is deliberately fatal: the user has requested that we lock,
1282: * but we can't parse their request properly. The only safe thing to
1283: * do is abort.
1284: */
1.203 dtucker 1285: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
1.266 djm 1286: fatal_fr(r, "parse");
1.203 dtucker 1287: if (pwlen == 0) {
1288: debug("empty password not supported");
1289: } else if (locked && !lock) {
1290: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1291: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
1292: fatal("bcrypt_pbkdf");
1.213 djm 1293: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 1294: debug("agent unlocked");
1295: locked = 0;
1296: fail_count = 0;
1.213 djm 1297: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 1298: success = 1;
1299: } else {
1300: /* delay in 0.1s increments up to 10s */
1301: if (fail_count < 100)
1302: fail_count++;
1303: delay = 100000 * fail_count;
1304: debug("unlock failed, delaying %0.1lf seconds",
1305: (double)delay/1000000);
1306: usleep(delay);
1307: }
1308: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 1309: } else if (!locked && lock) {
1.203 dtucker 1310: debug("agent locked");
1.88 markus 1311: locked = 1;
1.203 dtucker 1312: arc4random_buf(lock_salt, sizeof(lock_salt));
1313: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 1314: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 1315: fatal("bcrypt_pbkdf");
1.88 markus 1316: success = 1;
1317: }
1.256 jsg 1318: freezero(passwd, pwlen);
1.194 markus 1319: send_status(e, success);
1.88 markus 1320: }
1321:
1322: static void
1.221 djm 1323: no_identities(SocketEntry *e)
1.88 markus 1324: {
1.194 markus 1325: struct sshbuf *msg;
1326: int r;
1.88 markus 1327:
1.194 markus 1328: if ((msg = sshbuf_new()) == NULL)
1.266 djm 1329: fatal_f("sshbuf_new failed");
1.221 djm 1330: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 1331: (r = sshbuf_put_u32(msg, 0)) != 0 ||
1332: (r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 1333: fatal_fr(r, "compose");
1.194 markus 1334: sshbuf_free(msg);
1.88 markus 1335: }
1.59 markus 1336:
1.163 markus 1337: #ifdef ENABLE_PKCS11
1.59 markus 1338: static void
1.158 djm 1339: process_add_smartcard_key(SocketEntry *e)
1.59 markus 1340: {
1.226 djm 1341: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.253 djm 1342: char **comments = NULL;
1.221 djm 1343: int r, i, count = 0, success = 0, confirm = 0;
1.271 djm 1344: u_int seconds = 0;
1.174 dtucker 1345: time_t death = 0;
1.194 markus 1346: struct sshkey **keys = NULL, *k;
1.84 markus 1347: Identity *id;
1.281 djm 1348: struct dest_constraint *dest_constraints = NULL;
1349: size_t ndest_constraints = 0;
1.75 deraadt 1350:
1.269 djm 1351: debug2_f("entering");
1.194 markus 1352: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1353: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1354: error_fr(r, "parse");
1.226 djm 1355: goto send;
1356: }
1.271 djm 1357: if (parse_key_constraints(e->request, NULL, &death, &seconds, &confirm,
1.281 djm 1358: NULL, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1359: error_f("failed to parse constraints");
1360: goto send;
1.110 djm 1361: }
1.215 djm 1362: if (realpath(provider, canonical_provider) == NULL) {
1363: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1364: provider, strerror(errno));
1365: goto send;
1366: }
1.260 djm 1367: if (match_pattern_list(canonical_provider, allowed_providers, 0) != 1) {
1.215 djm 1368: verbose("refusing PKCS#11 add of \"%.100s\": "
1.260 djm 1369: "provider not allowed", canonical_provider);
1.215 djm 1370: goto send;
1371: }
1.266 djm 1372: debug_f("add %.100s", canonical_provider);
1.110 djm 1373: if (lifetime && !death)
1.175 dtucker 1374: death = monotime() + lifetime;
1.110 djm 1375:
1.253 djm 1376: count = pkcs11_add_provider(canonical_provider, pin, &keys, &comments);
1.163 markus 1377: for (i = 0; i < count; i++) {
1.84 markus 1378: k = keys[i];
1.221 djm 1379: if (lookup_identity(k) == NULL) {
1.163 markus 1380: id = xcalloc(1, sizeof(Identity));
1.84 markus 1381: id->key = k;
1.253 djm 1382: keys[i] = NULL; /* transferred */
1.215 djm 1383: id->provider = xstrdup(canonical_provider);
1.253 djm 1384: if (*comments[i] != '\0') {
1385: id->comment = comments[i];
1386: comments[i] = NULL; /* transferred */
1387: } else {
1388: id->comment = xstrdup(canonical_provider);
1389: }
1.110 djm 1390: id->death = death;
1391: id->confirm = confirm;
1.281 djm 1392: id->dest_constraints = dest_constraints;
1393: id->ndest_constraints = ndest_constraints;
1394: dest_constraints = NULL; /* transferred */
1395: ndest_constraints = 0;
1.221 djm 1396: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1397: idtab->nentries++;
1.84 markus 1398: success = 1;
1399: }
1.271 djm 1400: /* XXX update constraints for existing keys */
1.253 djm 1401: sshkey_free(keys[i]);
1402: free(comments[i]);
1.59 markus 1403: }
1404: send:
1.173 djm 1405: free(pin);
1406: free(provider);
1407: free(keys);
1.253 djm 1408: free(comments);
1.281 djm 1409: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1410: send_status(e, success);
1.59 markus 1411: }
1412:
1413: static void
1414: process_remove_smartcard_key(SocketEntry *e)
1415: {
1.217 djm 1416: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 djm 1417: int r, success = 0;
1.163 markus 1418: Identity *id, *nxt;
1.59 markus 1419:
1.269 djm 1420: debug2_f("entering");
1.194 markus 1421: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1422: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1423: error_fr(r, "parse");
1.226 djm 1424: goto send;
1425: }
1.173 djm 1426: free(pin);
1.59 markus 1427:
1.217 djm 1428: if (realpath(provider, canonical_provider) == NULL) {
1429: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1430: provider, strerror(errno));
1431: goto send;
1432: }
1433:
1.266 djm 1434: debug_f("remove %.100s", canonical_provider);
1.221 djm 1435: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
1436: nxt = TAILQ_NEXT(id, next);
1437: /* Skip file--based keys */
1438: if (id->provider == NULL)
1439: continue;
1440: if (!strcmp(canonical_provider, id->provider)) {
1441: TAILQ_REMOVE(&idtab->idlist, id, next);
1442: free_identity(id);
1443: idtab->nentries--;
1.59 markus 1444: }
1445: }
1.217 djm 1446: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 1447: success = 1;
1448: else
1.266 djm 1449: error_f("pkcs11_del_provider failed");
1.218 deraadt 1450: send:
1.173 djm 1451: free(provider);
1.194 markus 1452: send_status(e, success);
1.59 markus 1453: }
1.163 markus 1454: #endif /* ENABLE_PKCS11 */
1.59 markus 1455:
1.280 djm 1456: static int
1457: process_ext_session_bind(SocketEntry *e)
1458: {
1459: int r, sid_match, key_match;
1460: struct sshkey *key = NULL;
1461: struct sshbuf *sid = NULL, *sig = NULL;
1462: char *fp = NULL;
1463: size_t i;
1.281 djm 1464: u_char fwd = 0;
1.280 djm 1465:
1466: debug2_f("entering");
1467: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1468: (r = sshbuf_froms(e->request, &sid)) != 0 ||
1469: (r = sshbuf_froms(e->request, &sig)) != 0 ||
1470: (r = sshbuf_get_u8(e->request, &fwd)) != 0) {
1471: error_fr(r, "parse");
1472: goto out;
1473: }
1474: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1475: SSH_FP_DEFAULT)) == NULL)
1476: fatal_f("fingerprint failed");
1477: /* check signature with hostkey on session ID */
1478: if ((r = sshkey_verify(key, sshbuf_ptr(sig), sshbuf_len(sig),
1479: sshbuf_ptr(sid), sshbuf_len(sid), NULL, 0, NULL)) != 0) {
1480: error_fr(r, "sshkey_verify for %s %s", sshkey_type(key), fp);
1481: goto out;
1482: }
1483: /* check whether sid/key already recorded */
1484: for (i = 0; i < e->nsession_ids; i++) {
1.281 djm 1485: if (!e->session_ids[i].forwarded) {
1486: error_f("attempt to bind session ID to socket "
1487: "previously bound for authentication attempt");
1488: r = -1;
1489: goto out;
1490: }
1.280 djm 1491: sid_match = buf_equal(sid, e->session_ids[i].sid) == 0;
1492: key_match = sshkey_equal(key, e->session_ids[i].key);
1493: if (sid_match && key_match) {
1494: debug_f("session ID already recorded for %s %s",
1495: sshkey_type(key), fp);
1496: r = 0;
1497: goto out;
1498: } else if (sid_match) {
1499: error_f("session ID recorded against different key "
1500: "for %s %s", sshkey_type(key), fp);
1501: r = -1;
1502: goto out;
1503: }
1504: /*
1505: * new sid with previously-seen key can happen, e.g. multiple
1506: * connections to the same host.
1507: */
1508: }
1509: /* record new key/sid */
1510: if (e->nsession_ids >= AGENT_MAX_SESSION_IDS) {
1511: error_f("too many session IDs recorded");
1512: goto out;
1513: }
1514: e->session_ids = xrecallocarray(e->session_ids, e->nsession_ids,
1515: e->nsession_ids + 1, sizeof(*e->session_ids));
1516: i = e->nsession_ids++;
1517: debug_f("recorded %s %s (slot %zu of %d)", sshkey_type(key), fp, i,
1518: AGENT_MAX_SESSION_IDS);
1519: e->session_ids[i].key = key;
1520: e->session_ids[i].forwarded = fwd != 0;
1521: key = NULL; /* transferred */
1522: /* can't transfer sid; it's refcounted and scoped to request's life */
1523: if ((e->session_ids[i].sid = sshbuf_new()) == NULL)
1524: fatal_f("sshbuf_new");
1525: if ((r = sshbuf_putb(e->session_ids[i].sid, sid)) != 0)
1526: fatal_fr(r, "sshbuf_putb session ID");
1527: /* success */
1528: r = 0;
1529: out:
1530: sshkey_free(key);
1531: sshbuf_free(sid);
1532: sshbuf_free(sig);
1533: return r == 0 ? 1 : 0;
1534: }
1535:
1536: static void
1537: process_extension(SocketEntry *e)
1538: {
1539: int r, success = 0;
1540: char *name;
1541:
1542: debug2_f("entering");
1543: if ((r = sshbuf_get_cstring(e->request, &name, NULL)) != 0) {
1544: error_fr(r, "parse");
1545: goto send;
1546: }
1547: if (strcmp(name, "session-bind@openssh.com") == 0)
1548: success = process_ext_session_bind(e);
1549: else
1550: debug_f("unsupported extension \"%s\"", name);
1.285 ! djm 1551: free(name);
1.280 djm 1552: send:
1553: send_status(e, success);
1554: }
1.264 djm 1555: /*
1556: * dispatch incoming message.
1557: * returns 1 on success, 0 for incomplete messages or -1 on error.
1558: */
1.223 djm 1559: static int
1560: process_message(u_int socknum)
1.1 deraadt 1561: {
1.194 markus 1562: u_int msg_len;
1563: u_char type;
1564: const u_char *cp;
1565: int r;
1.223 djm 1566: SocketEntry *e;
1567:
1.266 djm 1568: if (socknum >= sockets_alloc)
1569: fatal_f("sock %u >= allocated %u", socknum, sockets_alloc);
1.223 djm 1570: e = &sockets[socknum];
1.89 markus 1571:
1.194 markus 1572: if (sshbuf_len(e->input) < 5)
1.223 djm 1573: return 0; /* Incomplete message header. */
1.194 markus 1574: cp = sshbuf_ptr(e->input);
1575: msg_len = PEEK_U32(cp);
1.223 djm 1576: if (msg_len > AGENT_MAX_LEN) {
1.266 djm 1577: debug_f("socket %u (fd=%d) message too long %u > %u",
1578: socknum, e->fd, msg_len, AGENT_MAX_LEN);
1.223 djm 1579: return -1;
1.21 markus 1580: }
1.194 markus 1581: if (sshbuf_len(e->input) < msg_len + 4)
1.223 djm 1582: return 0; /* Incomplete message body. */
1.87 markus 1583:
1584: /* move the current input to e->request */
1.194 markus 1585: sshbuf_reset(e->request);
1586: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
1.223 djm 1587: (r = sshbuf_get_u8(e->request, &type)) != 0) {
1588: if (r == SSH_ERR_MESSAGE_INCOMPLETE ||
1589: r == SSH_ERR_STRING_TOO_LARGE) {
1.266 djm 1590: error_fr(r, "parse");
1.223 djm 1591: return -1;
1592: }
1.266 djm 1593: fatal_fr(r, "parse");
1.223 djm 1594: }
1595:
1.266 djm 1596: debug_f("socket %u (fd=%d) type %d", socknum, e->fd, type);
1.21 markus 1597:
1.230 djm 1598: /* check whether agent is locked */
1.88 markus 1599: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 1600: sshbuf_reset(e->request);
1.88 markus 1601: switch (type) {
1602: case SSH2_AGENTC_REQUEST_IDENTITIES:
1603: /* send empty lists */
1.221 djm 1604: no_identities(e);
1.88 markus 1605: break;
1606: default:
1607: /* send a fail message for all other request types */
1.194 markus 1608: send_status(e, 0);
1.88 markus 1609: }
1.264 djm 1610: return 1;
1.88 markus 1611: }
1612:
1.21 markus 1613: switch (type) {
1.88 markus 1614: case SSH_AGENTC_LOCK:
1615: case SSH_AGENTC_UNLOCK:
1616: process_lock_agent(e, type == SSH_AGENTC_LOCK);
1617: break;
1.21 markus 1618: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 djm 1619: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 1620: break;
1621: /* ssh2 */
1622: case SSH2_AGENTC_SIGN_REQUEST:
1623: process_sign_request2(e);
1624: break;
1625: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 djm 1626: process_request_identities(e);
1.33 markus 1627: break;
1628: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 1629: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 djm 1630: process_add_identity(e);
1.33 markus 1631: break;
1632: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 djm 1633: process_remove_identity(e);
1.33 markus 1634: break;
1635: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 djm 1636: process_remove_all_identities(e);
1.21 markus 1637: break;
1.163 markus 1638: #ifdef ENABLE_PKCS11
1.59 markus 1639: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 1640: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 1641: process_add_smartcard_key(e);
1.75 deraadt 1642: break;
1.59 markus 1643: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
1644: process_remove_smartcard_key(e);
1.75 deraadt 1645: break;
1.163 markus 1646: #endif /* ENABLE_PKCS11 */
1.280 djm 1647: case SSH_AGENTC_EXTENSION:
1648: process_extension(e);
1649: break;
1.21 markus 1650: default:
1651: /* Unknown message. Respond with failure. */
1652: error("Unknown message %d", type);
1.194 markus 1653: sshbuf_reset(e->request);
1654: send_status(e, 0);
1.21 markus 1655: break;
1656: }
1.264 djm 1657: return 1;
1.1 deraadt 1658: }
1659:
1.55 itojun 1660: static void
1.73 stevesk 1661: new_socket(sock_type type, int fd)
1.1 deraadt 1662: {
1.112 markus 1663: u_int i, old_alloc, new_alloc;
1.96 deraadt 1664:
1.269 djm 1665: debug_f("type = %s", type == AUTH_CONNECTION ? "CONNECTION" :
1666: (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN"));
1.119 djm 1667: set_nonblock(fd);
1.21 markus 1668:
1669: if (fd > max_fd)
1670: max_fd = fd;
1671:
1672: for (i = 0; i < sockets_alloc; i++)
1673: if (sockets[i].type == AUTH_UNUSED) {
1674: sockets[i].fd = fd;
1.266 djm 1675: if ((sockets[i].input = sshbuf_new()) == NULL ||
1676: (sockets[i].output = sshbuf_new()) == NULL ||
1677: (sockets[i].request = sshbuf_new()) == NULL)
1678: fatal_f("sshbuf_new failed");
1.112 markus 1679: sockets[i].type = type;
1.21 markus 1680: return;
1681: }
1682: old_alloc = sockets_alloc;
1.112 markus 1683: new_alloc = sockets_alloc + 10;
1.269 djm 1684: sockets = xrecallocarray(sockets, old_alloc, new_alloc,
1685: sizeof(sockets[0]));
1.112 markus 1686: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 1687: sockets[i].type = AUTH_UNUSED;
1.112 markus 1688: sockets_alloc = new_alloc;
1.21 markus 1689: sockets[old_alloc].fd = fd;
1.266 djm 1690: if ((sockets[old_alloc].input = sshbuf_new()) == NULL ||
1691: (sockets[old_alloc].output = sshbuf_new()) == NULL ||
1692: (sockets[old_alloc].request = sshbuf_new()) == NULL)
1693: fatal_f("sshbuf_new failed");
1.112 markus 1694: sockets[old_alloc].type = type;
1.1 deraadt 1695: }
1696:
1.55 itojun 1697: static int
1.223 djm 1698: handle_socket_read(u_int socknum)
1.1 deraadt 1699: {
1.223 djm 1700: struct sockaddr_un sunaddr;
1701: socklen_t slen;
1702: uid_t euid;
1703: gid_t egid;
1704: int fd;
1705:
1706: slen = sizeof(sunaddr);
1707: fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen);
1.237 deraadt 1708: if (fd == -1) {
1.223 djm 1709: error("accept from AUTH_SOCKET: %s", strerror(errno));
1710: return -1;
1711: }
1.237 deraadt 1712: if (getpeereid(fd, &euid, &egid) == -1) {
1.223 djm 1713: error("getpeereid %d failed: %s", fd, strerror(errno));
1714: close(fd);
1715: return -1;
1716: }
1717: if ((euid != 0) && (getuid() != euid)) {
1718: error("uid mismatch: peer euid %u != uid %u",
1719: (u_int) euid, (u_int) getuid());
1720: close(fd);
1721: return -1;
1722: }
1723: new_socket(AUTH_CONNECTION, fd);
1724: return 0;
1725: }
1726:
1727: static int
1728: handle_conn_read(u_int socknum)
1729: {
1.233 djm 1730: char buf[AGENT_RBUF_LEN];
1.223 djm 1731: ssize_t len;
1732: int r;
1733:
1734: if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) {
1735: if (len == -1) {
1736: if (errno == EAGAIN || errno == EINTR)
1737: return 0;
1.266 djm 1738: error_f("read error on socket %u (fd %d): %s",
1739: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1740: }
1741: return -1;
1742: }
1743: if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0)
1.266 djm 1744: fatal_fr(r, "compose");
1.223 djm 1745: explicit_bzero(buf, sizeof(buf));
1.264 djm 1746: for (;;) {
1747: if ((r = process_message(socknum)) == -1)
1748: return -1;
1749: else if (r == 0)
1750: break;
1751: }
1.223 djm 1752: return 0;
1753: }
1754:
1755: static int
1756: handle_conn_write(u_int socknum)
1757: {
1758: ssize_t len;
1759: int r;
1760:
1761: if (sshbuf_len(sockets[socknum].output) == 0)
1762: return 0; /* shouldn't happen */
1763: if ((len = write(sockets[socknum].fd,
1764: sshbuf_ptr(sockets[socknum].output),
1765: sshbuf_len(sockets[socknum].output))) <= 0) {
1766: if (len == -1) {
1767: if (errno == EAGAIN || errno == EINTR)
1768: return 0;
1.266 djm 1769: error_f("read error on socket %u (fd %d): %s",
1770: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1771: }
1772: return -1;
1773: }
1774: if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0)
1.266 djm 1775: fatal_fr(r, "consume");
1.223 djm 1776: return 0;
1777: }
1778:
1779: static void
1.231 djm 1780: after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds)
1.223 djm 1781: {
1782: size_t i;
1.231 djm 1783: u_int socknum, activefds = npfd;
1.223 djm 1784:
1785: for (i = 0; i < npfd; i++) {
1786: if (pfd[i].revents == 0)
1787: continue;
1788: /* Find sockets entry */
1789: for (socknum = 0; socknum < sockets_alloc; socknum++) {
1790: if (sockets[socknum].type != AUTH_SOCKET &&
1791: sockets[socknum].type != AUTH_CONNECTION)
1792: continue;
1793: if (pfd[i].fd == sockets[socknum].fd)
1794: break;
1795: }
1796: if (socknum >= sockets_alloc) {
1.266 djm 1797: error_f("no socket for fd %d", pfd[i].fd);
1.223 djm 1798: continue;
1799: }
1800: /* Process events */
1801: switch (sockets[socknum].type) {
1802: case AUTH_SOCKET:
1.231 djm 1803: if ((pfd[i].revents & (POLLIN|POLLERR)) == 0)
1804: break;
1805: if (npfd > maxfds) {
1806: debug3("out of fds (active %u >= limit %u); "
1807: "skipping accept", activefds, maxfds);
1808: break;
1809: }
1810: if (handle_socket_read(socknum) == 0)
1811: activefds++;
1.223 djm 1812: break;
1813: case AUTH_CONNECTION:
1.279 djm 1814: if ((pfd[i].revents & (POLLIN|POLLHUP|POLLERR)) != 0 &&
1815: handle_conn_read(socknum) != 0)
1.231 djm 1816: goto close_sock;
1817: if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 &&
1818: handle_conn_write(socknum) != 0) {
1819: close_sock:
1820: if (activefds == 0)
1821: fatal("activefds == 0 at close_sock");
1.223 djm 1822: close_socket(&sockets[socknum]);
1.231 djm 1823: activefds--;
1.223 djm 1824: break;
1825: }
1826: break;
1827: default:
1828: break;
1829: }
1830: }
1831: }
1832:
1833: static int
1.231 djm 1834: prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds)
1.223 djm 1835: {
1836: struct pollfd *pfd = *pfdp;
1837: size_t i, j, npfd = 0;
1.174 dtucker 1838: time_t deadline;
1.233 djm 1839: int r;
1.46 markus 1840:
1.223 djm 1841: /* Count active sockets */
1.46 markus 1842: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 1843: switch (sockets[i].type) {
1844: case AUTH_SOCKET:
1845: case AUTH_CONNECTION:
1.223 djm 1846: npfd++;
1.21 markus 1847: break;
1848: case AUTH_UNUSED:
1849: break;
1850: default:
1851: fatal("Unknown socket type %d", sockets[i].type);
1852: break;
1853: }
1.46 markus 1854: }
1.223 djm 1855: if (npfd != *npfdp &&
1856: (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL)
1.266 djm 1857: fatal_f("recallocarray failed");
1.223 djm 1858: *pfdp = pfd;
1859: *npfdp = npfd;
1.46 markus 1860:
1.223 djm 1861: for (i = j = 0; i < sockets_alloc; i++) {
1.46 markus 1862: switch (sockets[i].type) {
1863: case AUTH_SOCKET:
1.231 djm 1864: if (npfd > maxfds) {
1865: debug3("out of fds (active %zu >= limit %u); "
1866: "skipping arming listener", npfd, maxfds);
1867: break;
1868: }
1869: pfd[j].fd = sockets[i].fd;
1870: pfd[j].revents = 0;
1871: pfd[j].events = POLLIN;
1872: j++;
1873: break;
1.46 markus 1874: case AUTH_CONNECTION:
1.223 djm 1875: pfd[j].fd = sockets[i].fd;
1876: pfd[j].revents = 0;
1.233 djm 1877: /*
1878: * Only prepare to read if we can handle a full-size
1879: * input read buffer and enqueue a max size reply..
1880: */
1881: if ((r = sshbuf_check_reserve(sockets[i].input,
1882: AGENT_RBUF_LEN)) == 0 &&
1883: (r = sshbuf_check_reserve(sockets[i].output,
1.278 djm 1884: AGENT_MAX_LEN)) == 0)
1.233 djm 1885: pfd[j].events = POLLIN;
1.266 djm 1886: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1887: fatal_fr(r, "reserve");
1.194 markus 1888: if (sshbuf_len(sockets[i].output) > 0)
1.223 djm 1889: pfd[j].events |= POLLOUT;
1890: j++;
1.46 markus 1891: break;
1892: default:
1893: break;
1894: }
1895: }
1.155 dtucker 1896: deadline = reaper();
1897: if (parent_alive_interval != 0)
1898: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 1899: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 1900: if (deadline == 0) {
1.224 djm 1901: *timeoutp = -1; /* INFTIM */
1.155 dtucker 1902: } else {
1.223 djm 1903: if (deadline > INT_MAX / 1000)
1904: *timeoutp = INT_MAX / 1000;
1905: else
1906: *timeoutp = deadline * 1000;
1.155 dtucker 1907: }
1.46 markus 1908: return (1);
1.21 markus 1909: }
1910:
1.55 itojun 1911: static void
1.113 markus 1912: cleanup_socket(void)
1.15 markus 1913: {
1.187 djm 1914: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1915: return;
1.266 djm 1916: debug_f("cleanup");
1.48 deraadt 1917: if (socket_name[0])
1918: unlink(socket_name);
1919: if (socket_dir[0])
1920: rmdir(socket_dir);
1.10 markus 1921: }
1922:
1.114 markus 1923: void
1.15 markus 1924: cleanup_exit(int i)
1925: {
1.113 markus 1926: cleanup_socket();
1927: _exit(i);
1.15 markus 1928: }
1929:
1.135 deraadt 1930: /*ARGSUSED*/
1.55 itojun 1931: static void
1.48 deraadt 1932: cleanup_handler(int sig)
1933: {
1.113 markus 1934: cleanup_socket();
1.163 markus 1935: #ifdef ENABLE_PKCS11
1936: pkcs11_terminate();
1937: #endif
1.48 deraadt 1938: _exit(2);
1.113 markus 1939: }
1940:
1.68 markus 1941: static void
1.155 dtucker 1942: check_parent_exists(void)
1.68 markus 1943: {
1.172 dtucker 1944: /*
1945: * If our parent has exited then getppid() will return (pid_t)1,
1946: * so testing for that should be safe.
1947: */
1948: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1949: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1950: cleanup_socket();
1951: _exit(2);
1.68 markus 1952: }
1.48 deraadt 1953: }
1954:
1.55 itojun 1955: static void
1.50 itojun 1956: usage(void)
1.15 markus 1957: {
1.184 deraadt 1958: fprintf(stderr,
1.250 jmc 1959: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.261 jmc 1960: " [-P allowed_providers] [-t life]\n"
1.260 djm 1961: " ssh-agent [-a bind_address] [-E fingerprint_hash] [-P allowed_providers]\n"
1.259 dtucker 1962: " [-t life] command [arg ...]\n"
1.250 jmc 1963: " ssh-agent [-c | -s] -k\n");
1.21 markus 1964: exit(1);
1.15 markus 1965: }
1966:
1.2 provos 1967: int
1968: main(int ac, char **av)
1.1 deraadt 1969: {
1.201 djm 1970: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.265 djm 1971: int sock, ch, result, saved_errno;
1.96 deraadt 1972: char *shell, *format, *pidstr, *agentsocket = NULL;
1.41 markus 1973: struct rlimit rlim;
1.96 deraadt 1974: extern int optind;
1.98 stevesk 1975: extern char *optarg;
1.21 markus 1976: pid_t pid;
1.96 deraadt 1977: char pidstrbuf[1 + 3 * sizeof pid];
1.161 tobias 1978: size_t len;
1.189 djm 1979: mode_t prev_mask;
1.224 djm 1980: int timeout = -1; /* INFTIM */
1.223 djm 1981: struct pollfd *pfd = NULL;
1982: size_t npfd = 0;
1.231 djm 1983: u_int maxfds;
1.123 djm 1984:
1985: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1986: sanitise_stdfd();
1.99 markus 1987:
1988: /* drop */
1989: setegid(getgid());
1990: setgid(getgid());
1.53 markus 1991:
1.231 djm 1992: if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
1993: fatal("%s: getrlimit: %s", __progname, strerror(errno));
1994:
1.185 markus 1995: #ifdef WITH_OPENSSL
1.170 djm 1996: OpenSSL_add_all_algorithms();
1.185 markus 1997: #endif
1.21 markus 1998:
1.258 djm 1999: while ((ch = getopt(ac, av, "cDdksE:a:O:P:t:")) != -1) {
1.21 markus 2000: switch (ch) {
1.192 djm 2001: case 'E':
2002: fingerprint_hash = ssh_digest_alg_by_name(optarg);
2003: if (fingerprint_hash == -1)
2004: fatal("Invalid hash algorithm \"%s\"", optarg);
2005: break;
1.21 markus 2006: case 'c':
2007: if (s_flag)
2008: usage();
2009: c_flag++;
2010: break;
2011: case 'k':
2012: k_flag++;
1.258 djm 2013: break;
2014: case 'O':
2015: if (strcmp(optarg, "no-restrict-websafe") == 0)
2016: restrict_websafe = 0;
2017: else
2018: fatal("Unknown -O option");
1.21 markus 2019: break;
1.215 djm 2020: case 'P':
1.260 djm 2021: if (allowed_providers != NULL)
1.215 djm 2022: fatal("-P option already specified");
1.260 djm 2023: allowed_providers = xstrdup(optarg);
1.215 djm 2024: break;
1.21 markus 2025: case 's':
2026: if (c_flag)
2027: usage();
2028: s_flag++;
2029: break;
1.57 markus 2030: case 'd':
1.201 djm 2031: if (d_flag || D_flag)
1.57 markus 2032: usage();
2033: d_flag++;
2034: break;
1.201 djm 2035: case 'D':
2036: if (d_flag || D_flag)
2037: usage();
2038: D_flag++;
2039: break;
1.86 markus 2040: case 'a':
2041: agentsocket = optarg;
1.106 marc 2042: break;
2043: case 't':
2044: if ((lifetime = convtime(optarg)) == -1) {
2045: fprintf(stderr, "Invalid lifetime\n");
2046: usage();
2047: }
1.86 markus 2048: break;
1.21 markus 2049: default:
2050: usage();
2051: }
2052: }
2053: ac -= optind;
2054: av += optind;
2055:
1.201 djm 2056: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 2057: usage();
2058:
1.260 djm 2059: if (allowed_providers == NULL)
1.262 djm 2060: allowed_providers = xstrdup(DEFAULT_ALLOWED_PROVIDERS);
1.215 djm 2061:
1.85 markus 2062: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 2063: shell = getenv("SHELL");
1.161 tobias 2064: if (shell != NULL && (len = strlen(shell)) > 2 &&
2065: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 2066: c_flag = 1;
2067: }
2068: if (k_flag) {
1.136 deraadt 2069: const char *errstr = NULL;
2070:
1.21 markus 2071: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
2072: if (pidstr == NULL) {
2073: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 2074: SSH_AGENTPID_ENV_NAME);
1.21 markus 2075: exit(1);
2076: }
1.136 deraadt 2077: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
2078: if (errstr) {
2079: fprintf(stderr,
2080: "%s=\"%s\", which is not a good PID: %s\n",
2081: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 2082: exit(1);
2083: }
2084: if (kill(pid, SIGTERM) == -1) {
2085: perror("kill");
2086: exit(1);
2087: }
2088: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 2089: printf(format, SSH_AUTHSOCKET_ENV_NAME);
2090: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 2091: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 2092: exit(0);
2093: }
1.231 djm 2094:
2095: /*
2096: * Minimum file descriptors:
2097: * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) +
2098: * a few spare for libc / stack protectors / sanitisers, etc.
2099: */
2100: #define SSH_AGENT_MIN_FDS (3+1+1+1+4)
2101: if (rlim.rlim_cur < SSH_AGENT_MIN_FDS)
1.232 djm 2102: fatal("%s: file descriptor rlimit %lld too low (minimum %u)",
1.231 djm 2103: __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS);
2104: maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS;
2105:
1.21 markus 2106: parent_pid = getpid();
2107:
1.86 markus 2108: if (agentsocket == NULL) {
2109: /* Create private directory for agent socket */
1.171 djm 2110: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 2111: if (mkdtemp(socket_dir) == NULL) {
2112: perror("mkdtemp: private socket dir");
2113: exit(1);
2114: }
1.91 mpech 2115: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
2116: (long)parent_pid);
1.86 markus 2117: } else {
2118: /* Try to use specified agent socket */
2119: socket_dir[0] = '\0';
2120: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 2121: }
2122:
1.23 markus 2123: /*
2124: * Create socket early so it will exist before command gets run from
2125: * the parent.
2126: */
1.189 djm 2127: prev_mask = umask(0177);
1.188 millert 2128: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 2129: if (sock < 0) {
1.188 millert 2130: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 2131: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 2132: cleanup_exit(1);
2133: }
1.189 djm 2134: umask(prev_mask);
1.46 markus 2135:
1.23 markus 2136: /*
2137: * Fork, and have the parent execute the command, if any, or present
2138: * the socket data. The child continues as the authentication agent.
2139: */
1.201 djm 2140: if (D_flag || d_flag) {
2141: log_init(__progname,
2142: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
2143: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 2144: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2145: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
2146: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 2147: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 2148: fflush(stdout);
1.57 markus 2149: goto skip;
2150: }
1.21 markus 2151: pid = fork();
2152: if (pid == -1) {
2153: perror("fork");
1.81 stevesk 2154: cleanup_exit(1);
1.21 markus 2155: }
2156: if (pid != 0) { /* Parent - execute the given command. */
2157: close(sock);
1.91 mpech 2158: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 2159: if (ac == 0) {
2160: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2161: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 2162: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 2163: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 2164: SSH_AGENTPID_ENV_NAME);
1.91 mpech 2165: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 2166: exit(0);
2167: }
1.36 deraadt 2168: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
2169: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
2170: perror("setenv");
2171: exit(1);
2172: }
1.21 markus 2173: execvp(av[0], av);
2174: perror(av[0]);
2175: exit(1);
2176: }
1.81 stevesk 2177: /* child */
2178: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 2179:
2180: if (setsid() == -1) {
1.81 stevesk 2181: error("setsid: %s", strerror(errno));
1.67 stevesk 2182: cleanup_exit(1);
2183: }
2184:
2185: (void)chdir("/");
1.265 djm 2186: if (stdfd_devnull(1, 1, 1) == -1)
1.266 djm 2187: error_f("stdfd_devnull failed");
1.21 markus 2188:
1.41 markus 2189: /* deny core dumps, since memory contains unencrypted private keys */
2190: rlim.rlim_cur = rlim.rlim_max = 0;
1.237 deraadt 2191: if (setrlimit(RLIMIT_CORE, &rlim) == -1) {
1.81 stevesk 2192: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 2193: cleanup_exit(1);
2194: }
1.57 markus 2195:
2196: skip:
1.187 djm 2197:
2198: cleanup_pid = getpid();
1.163 markus 2199:
2200: #ifdef ENABLE_PKCS11
2201: pkcs11_init(0);
2202: #endif
1.21 markus 2203: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 2204: if (ac > 0)
2205: parent_alive_interval = 10;
1.33 markus 2206: idtab_init();
1.252 dtucker 2207: ssh_signal(SIGPIPE, SIG_IGN);
2208: ssh_signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
2209: ssh_signal(SIGHUP, cleanup_handler);
2210: ssh_signal(SIGTERM, cleanup_handler);
1.205 djm 2211:
1.215 djm 2212: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 2213: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 2214:
1.21 markus 2215: while (1) {
1.231 djm 2216: prepare_poll(&pfd, &npfd, &timeout, maxfds);
1.223 djm 2217: result = poll(pfd, npfd, timeout);
1.154 dtucker 2218: saved_errno = errno;
1.155 dtucker 2219: if (parent_alive_interval != 0)
2220: check_parent_exists();
2221: (void) reaper(); /* remove expired keys */
1.237 deraadt 2222: if (result == -1) {
1.154 dtucker 2223: if (saved_errno == EINTR)
1.21 markus 2224: continue;
1.223 djm 2225: fatal("poll: %s", strerror(saved_errno));
1.154 dtucker 2226: } else if (result > 0)
1.231 djm 2227: after_poll(pfd, npfd, maxfds);
1.15 markus 2228: }
1.21 markus 2229: /* NOTREACHED */
1.1 deraadt 2230: }
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