Annotation of src/usr.bin/ssh/ssh-agent.c, Revision 1.282
1.282 ! djm 1: /* $OpenBSD: ssh-agent.c,v 1.281 2021/12/19 22:11:39 djm Exp $ */
1.1 deraadt 2: /*
1.22 deraadt 3: * Author: Tatu Ylonen <ylo@cs.hut.fi>
4: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5: * All rights reserved
6: * The authentication agent program.
1.33 markus 7: *
1.35 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
13: *
1.56 markus 14: * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
1.35 deraadt 15: *
16: * Redistribution and use in source and binary forms, with or without
17: * modification, are permitted provided that the following conditions
18: * are met:
19: * 1. Redistributions of source code must retain the above copyright
20: * notice, this list of conditions and the following disclaimer.
21: * 2. Redistributions in binary form must reproduce the above copyright
22: * notice, this list of conditions and the following disclaimer in the
23: * documentation and/or other materials provided with the distribution.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.22 deraadt 35: */
1.1 deraadt 36:
1.151 deraadt 37: #include <sys/types.h>
1.153 djm 38: #include <sys/time.h>
1.78 provos 39: #include <sys/queue.h>
1.127 stevesk 40: #include <sys/resource.h>
1.141 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
440: * authenicate *to* a host but not permitted for *use* beyond it.
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;
1.221 djm 717: struct sshkey *key = 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: }
1.282 ! djm 746: if (parse_userauth_request(data, key, &user, &sid, NULL) != 0) {
1.281 djm 747: logit_f("refusing use of destination-constrained key "
748: "to sign an unidentified signature");
749: goto send;
750: }
751: /* XXX logspam */
752: debug_f("user=%s", user);
753: if (identity_permitted(id, e, user, &fwd_host, &dest_host) != 0)
754: goto send;
755: /* XXX display fwd_host/dest_host in askpass UI */
1.280 djm 756: /*
1.281 djm 757: * Ensure that the session ID is the most recent one
758: * registered on the socket - it should have been bound by
759: * ssh immediately before userauth.
1.280 djm 760: */
1.281 djm 761: if (buf_equal(sid,
762: e->session_ids[e->nsession_ids - 1].sid) != 0) {
763: error_f("unexpected session ID (%zu listed) on "
764: "signature request for target user %s with "
765: "key %s %s", e->nsession_ids, user,
766: sshkey_type(id->key), fp);
767: goto send;
1.280 djm 768: }
1.281 djm 769: xasprintf(&sig_dest, "public key authentication request for "
770: "user \"%s\" to listed host", user);
1.280 djm 771: }
772: if (id->confirm && confirm_key(id, sig_dest) != 0) {
1.266 djm 773: verbose_f("user refused key");
1.195 djm 774: goto send;
775: }
1.258 djm 776: if (sshkey_is_sk(id->key)) {
777: if (strncmp(id->key->sk_application, "ssh:", 4) != 0 &&
1.270 djm 778: !check_websafe_message_contents(key, data)) {
1.258 djm 779: /* error already logged */
780: goto send;
781: }
782: if ((id->key->sk_flags & SSH_SK_USER_PRESENCE_REQD)) {
783: notifier = notify_start(0,
1.280 djm 784: "Confirm user presence for key %s %s%s%s",
785: sshkey_type(id->key), fp,
786: sig_dest == NULL ? "" : "\n",
787: sig_dest == NULL ? "" : sig_dest);
1.258 djm 788: }
1.251 djm 789: }
1.263 djm 790: /* XXX support PIN required FIDO keys */
1.251 djm 791: if ((r = sshkey_sign(id->key, &signature, &slen,
1.270 djm 792: sshbuf_ptr(data), sshbuf_len(data), agent_decode_alg(key, flags),
1.263 djm 793: id->sk_provider, NULL, compat)) != 0) {
1.266 djm 794: error_fr(r, "sshkey_sign");
1.251 djm 795: goto send;
1.33 markus 796: }
1.195 djm 797: /* Success */
798: ok = 0;
799: send:
1.267 djm 800: notify_complete(notifier, "User presence confirmed");
1.270 djm 801:
1.33 markus 802: if (ok == 0) {
1.194 markus 803: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
804: (r = sshbuf_put_string(msg, signature, slen)) != 0)
1.266 djm 805: fatal_fr(r, "compose");
1.194 markus 806: } else if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
1.266 djm 807: fatal_fr(r, "compose failure");
1.194 markus 808:
809: if ((r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 810: fatal_fr(r, "enqueue");
1.194 markus 811:
1.280 djm 812: sshbuf_free(sid);
1.270 djm 813: sshbuf_free(data);
1.194 markus 814: sshbuf_free(msg);
1.270 djm 815: sshkey_free(key);
816: free(fp);
1.173 djm 817: free(signature);
1.280 djm 818: free(sig_dest);
819: free(user);
1.1 deraadt 820: }
821:
1.33 markus 822: /* shared */
1.55 itojun 823: static void
1.221 djm 824: process_remove_identity(SocketEntry *e)
1.1 deraadt 825: {
1.194 markus 826: int r, success = 0;
827: struct sshkey *key = NULL;
1.221 djm 828: Identity *id;
1.21 markus 829:
1.269 djm 830: debug2_f("entering");
1.221 djm 831: if ((r = sshkey_froms(e->request, &key)) != 0) {
1.266 djm 832: error_fr(r, "parse key");
1.221 djm 833: goto done;
834: }
835: if ((id = lookup_identity(key)) == NULL) {
1.266 djm 836: debug_f("key not found");
1.221 djm 837: goto done;
838: }
1.281 djm 839: /* identity not visible, cannot be removed */
840: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
841: goto done; /* error already logged */
1.221 djm 842: /* We have this key, free it. */
843: if (idtab->nentries < 1)
1.266 djm 844: fatal_f("internal error: nentries %d", idtab->nentries);
1.221 djm 845: TAILQ_REMOVE(&idtab->idlist, id, next);
846: free_identity(id);
847: idtab->nentries--;
848: success = 1;
849: done:
1.276 djm 850: sshkey_free(key);
1.194 markus 851: send_status(e, success);
1.1 deraadt 852: }
853:
1.55 itojun 854: static void
1.221 djm 855: process_remove_all_identities(SocketEntry *e)
1.1 deraadt 856: {
1.78 provos 857: Identity *id;
1.21 markus 858:
1.269 djm 859: debug2_f("entering");
1.21 markus 860: /* Loop over all identities and clear the keys. */
1.221 djm 861: for (id = TAILQ_FIRST(&idtab->idlist); id;
862: id = TAILQ_FIRST(&idtab->idlist)) {
863: TAILQ_REMOVE(&idtab->idlist, id, next);
1.78 provos 864: free_identity(id);
1.21 markus 865: }
866:
867: /* Mark that there are no identities. */
1.221 djm 868: idtab->nentries = 0;
1.21 markus 869:
870: /* Send success. */
1.194 markus 871: send_status(e, 1);
1.1 deraadt 872: }
873:
1.155 dtucker 874: /* removes expired keys and returns number of seconds until the next expiry */
1.174 dtucker 875: static time_t
1.89 markus 876: reaper(void)
877: {
1.175 dtucker 878: time_t deadline = 0, now = monotime();
1.89 markus 879: Identity *id, *nxt;
880:
1.221 djm 881: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
882: nxt = TAILQ_NEXT(id, next);
883: if (id->death == 0)
884: continue;
885: if (now >= id->death) {
886: debug("expiring key '%s'", id->comment);
887: TAILQ_REMOVE(&idtab->idlist, id, next);
888: free_identity(id);
889: idtab->nentries--;
890: } else
891: deadline = (deadline == 0) ? id->death :
892: MINIMUM(deadline, id->death);
1.89 markus 893: }
1.155 dtucker 894: if (deadline == 0 || deadline <= now)
895: return 0;
896: else
897: return (deadline - now);
1.89 markus 898: }
899:
1.271 djm 900: static int
1.281 djm 901: parse_dest_constraint_hop(struct sshbuf *b, struct dest_constraint_hop *dch)
902: {
903: u_char key_is_ca;
904: size_t elen = 0;
905: int r;
906: struct sshkey *k = NULL;
907: char *fp;
908:
909: memset(dch, '\0', sizeof(*dch));
910: if ((r = sshbuf_get_cstring(b, &dch->user, NULL)) != 0 ||
911: (r = sshbuf_get_cstring(b, &dch->hostname, NULL)) != 0 ||
912: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
913: error_fr(r, "parse");
914: goto out;
915: }
916: if (elen != 0) {
917: error_f("unsupported extensions (len %zu)", elen);
918: r = SSH_ERR_FEATURE_UNSUPPORTED;
919: goto out;
920: }
921: if (*dch->hostname == '\0') {
922: free(dch->hostname);
923: dch->hostname = NULL;
924: }
925: if (*dch->user == '\0') {
926: free(dch->user);
927: dch->user = NULL;
928: }
929: while (sshbuf_len(b) != 0) {
930: dch->keys = xrecallocarray(dch->keys, dch->nkeys,
931: dch->nkeys + 1, sizeof(*dch->keys));
932: dch->key_is_ca = xrecallocarray(dch->key_is_ca, dch->nkeys,
933: dch->nkeys + 1, sizeof(*dch->key_is_ca));
934: if ((r = sshkey_froms(b, &k)) != 0 ||
935: (r = sshbuf_get_u8(b, &key_is_ca)) != 0)
936: goto out;
937: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
938: SSH_FP_DEFAULT)) == NULL)
939: fatal_f("fingerprint failed");
940: debug3_f("%s%s%s: adding %skey %s %s",
941: dch->user == NULL ? "" : dch->user,
942: dch->user == NULL ? "" : "@",
943: dch->hostname, key_is_ca ? "CA " : "", sshkey_type(k), fp);
944: free(fp);
945: dch->keys[dch->nkeys] = k;
946: dch->key_is_ca[dch->nkeys] = key_is_ca != 0;
947: dch->nkeys++;
948: k = NULL; /* transferred */
949: }
950: /* success */
951: r = 0;
952: out:
953: sshkey_free(k);
954: return r;
955: }
956:
957: static int
958: parse_dest_constraint(struct sshbuf *m, struct dest_constraint *dc)
959: {
960: struct sshbuf *b = NULL, *frombuf = NULL, *tobuf = NULL;
961: int r;
962: size_t elen = 0;
963:
964: debug3_f("entering");
965:
966: memset(dc, '\0', sizeof(*dc));
967: if ((r = sshbuf_froms(m, &b)) != 0 ||
968: (r = sshbuf_froms(b, &frombuf)) != 0 ||
969: (r = sshbuf_froms(b, &tobuf)) != 0 ||
970: (r = sshbuf_get_string_direct(b, NULL, &elen)) != 0) {
971: error_fr(r, "parse");
972: goto out;
973: }
974: if ((r = parse_dest_constraint_hop(frombuf, &dc->from) != 0) ||
975: (r = parse_dest_constraint_hop(tobuf, &dc->to) != 0))
976: goto out; /* already logged */
977: if (elen != 0) {
978: error_f("unsupported extensions (len %zu)", elen);
979: r = SSH_ERR_FEATURE_UNSUPPORTED;
980: goto out;
981: }
982: debug2_f("parsed %s (%u keys) > %s%s%s (%u keys)",
983: dc->from.hostname ? dc->from.hostname : "(ORIGIN)", dc->from.nkeys,
984: dc->to.user ? dc->to.user : "", dc->to.user ? "@" : "",
985: dc->to.hostname ? dc->to.hostname : "(ANY)", dc->to.nkeys);
986: /* check consistency */
987: if ((dc->from.hostname == NULL) != (dc->from.nkeys == 0) ||
988: dc->from.user != NULL) {
989: error_f("inconsistent \"from\" specification");
990: r = SSH_ERR_INVALID_FORMAT;
991: goto out;
992: }
993: if (dc->to.hostname == NULL || dc->to.nkeys == 0) {
994: error_f("incomplete \"to\" specification");
995: r = SSH_ERR_INVALID_FORMAT;
996: goto out;
997: }
998: /* success */
999: r = 0;
1000: out:
1001: sshbuf_free(b);
1002: sshbuf_free(frombuf);
1003: sshbuf_free(tobuf);
1004: return r;
1005: }
1006:
1007: static int
1008: parse_key_constraint_extension(struct sshbuf *m, char **sk_providerp,
1009: struct dest_constraint **dcsp, size_t *ndcsp)
1.277 djm 1010: {
1011: char *ext_name = NULL;
1012: int r;
1.281 djm 1013: struct sshbuf *b = NULL;
1.277 djm 1014:
1015: if ((r = sshbuf_get_cstring(m, &ext_name, NULL)) != 0) {
1016: error_fr(r, "parse constraint extension");
1017: goto out;
1018: }
1019: debug_f("constraint ext %s", ext_name);
1020: if (strcmp(ext_name, "sk-provider@openssh.com") == 0) {
1021: if (sk_providerp == NULL) {
1022: error_f("%s not valid here", ext_name);
1023: r = SSH_ERR_INVALID_FORMAT;
1024: goto out;
1025: }
1026: if (*sk_providerp != NULL) {
1027: error_f("%s already set", ext_name);
1028: r = SSH_ERR_INVALID_FORMAT;
1029: goto out;
1030: }
1031: if ((r = sshbuf_get_cstring(m, sk_providerp, NULL)) != 0) {
1032: error_fr(r, "parse %s", ext_name);
1033: goto out;
1034: }
1.281 djm 1035: } else if (strcmp(ext_name,
1036: "restrict-destination-v00@openssh.com") == 0) {
1037: if (*dcsp != NULL) {
1038: error_f("%s already set", ext_name);
1039: goto out;
1040: }
1041: if ((r = sshbuf_froms(m, &b)) != 0) {
1042: error_fr(r, "parse %s outer", ext_name);
1043: goto out;
1044: }
1045: while (sshbuf_len(b) != 0) {
1046: if (*ndcsp >= AGENT_MAX_DEST_CONSTRAINTS) {
1047: error_f("too many %s constraints", ext_name);
1048: goto out;
1049: }
1050: *dcsp = xrecallocarray(*dcsp, *ndcsp, *ndcsp + 1,
1051: sizeof(**dcsp));
1052: if ((r = parse_dest_constraint(b,
1053: *dcsp + (*ndcsp)++)) != 0)
1054: goto out; /* error already logged */
1055: }
1.277 djm 1056: } else {
1057: error_f("unsupported constraint \"%s\"", ext_name);
1058: r = SSH_ERR_FEATURE_UNSUPPORTED;
1059: goto out;
1060: }
1061: /* success */
1062: r = 0;
1063: out:
1064: free(ext_name);
1.281 djm 1065: sshbuf_free(b);
1.277 djm 1066: return r;
1067: }
1068:
1069: static int
1.271 djm 1070: parse_key_constraints(struct sshbuf *m, struct sshkey *k, time_t *deathp,
1.281 djm 1071: u_int *secondsp, int *confirmp, char **sk_providerp,
1072: struct dest_constraint **dcsp, size_t *ndcsp)
1.1 deraadt 1073: {
1.194 markus 1074: u_char ctype;
1.271 djm 1075: int r;
1076: u_int seconds, maxsign = 0;
1.33 markus 1077:
1.271 djm 1078: while (sshbuf_len(m)) {
1079: if ((r = sshbuf_get_u8(m, &ctype)) != 0) {
1.266 djm 1080: error_fr(r, "parse constraint type");
1.277 djm 1081: goto out;
1.194 markus 1082: }
1083: switch (ctype) {
1.94 markus 1084: case SSH_AGENT_CONSTRAIN_LIFETIME:
1.271 djm 1085: if (*deathp != 0) {
1086: error_f("lifetime already set");
1.277 djm 1087: r = SSH_ERR_INVALID_FORMAT;
1088: goto out;
1.271 djm 1089: }
1090: if ((r = sshbuf_get_u32(m, &seconds)) != 0) {
1.266 djm 1091: error_fr(r, "parse lifetime constraint");
1.277 djm 1092: goto out;
1.194 markus 1093: }
1.271 djm 1094: *deathp = monotime() + seconds;
1095: *secondsp = seconds;
1.94 markus 1096: break;
1.107 markus 1097: case SSH_AGENT_CONSTRAIN_CONFIRM:
1.271 djm 1098: if (*confirmp != 0) {
1099: error_f("confirm already set");
1.277 djm 1100: r = SSH_ERR_INVALID_FORMAT;
1101: goto out;
1.271 djm 1102: }
1103: *confirmp = 1;
1.107 markus 1104: break;
1.228 markus 1105: case SSH_AGENT_CONSTRAIN_MAXSIGN:
1.271 djm 1106: if (k == NULL) {
1107: error_f("maxsign not valid here");
1.277 djm 1108: r = SSH_ERR_INVALID_FORMAT;
1109: goto out;
1.271 djm 1110: }
1111: if (maxsign != 0) {
1112: error_f("maxsign already set");
1.277 djm 1113: r = SSH_ERR_INVALID_FORMAT;
1114: goto out;
1.271 djm 1115: }
1116: if ((r = sshbuf_get_u32(m, &maxsign)) != 0) {
1.266 djm 1117: error_fr(r, "parse maxsign constraint");
1.277 djm 1118: goto out;
1.228 markus 1119: }
1120: if ((r = sshkey_enable_maxsign(k, maxsign)) != 0) {
1.266 djm 1121: error_fr(r, "enable maxsign");
1.277 djm 1122: goto out;
1.228 markus 1123: }
1124: break;
1.238 djm 1125: case SSH_AGENT_CONSTRAIN_EXTENSION:
1.277 djm 1126: if ((r = parse_key_constraint_extension(m,
1.281 djm 1127: sk_providerp, dcsp, ndcsp)) != 0)
1.277 djm 1128: goto out; /* error already logged */
1.238 djm 1129: break;
1.94 markus 1130: default:
1.266 djm 1131: error_f("Unknown constraint %d", ctype);
1.277 djm 1132: r = SSH_ERR_FEATURE_UNSUPPORTED;
1133: goto out;
1.94 markus 1134: }
1135: }
1.271 djm 1136: /* success */
1.277 djm 1137: r = 0;
1138: out:
1139: return r;
1.271 djm 1140: }
1141:
1142: static void
1143: process_add_identity(SocketEntry *e)
1144: {
1145: Identity *id;
1146: int success = 0, confirm = 0;
1.272 dtucker 1147: char *fp, *comment = NULL, *sk_provider = NULL;
1.271 djm 1148: char canonical_provider[PATH_MAX];
1149: time_t death = 0;
1150: u_int seconds = 0;
1.281 djm 1151: struct dest_constraint *dest_constraints = NULL;
1152: size_t ndest_constraints = 0;
1.271 djm 1153: struct sshkey *k = NULL;
1154: int r = SSH_ERR_INTERNAL_ERROR;
1155:
1156: debug2_f("entering");
1157: if ((r = sshkey_private_deserialize(e->request, &k)) != 0 ||
1158: k == NULL ||
1159: (r = sshbuf_get_cstring(e->request, &comment, NULL)) != 0) {
1160: error_fr(r, "parse");
1161: goto out;
1162: }
1163: if (parse_key_constraints(e->request, k, &death, &seconds, &confirm,
1.281 djm 1164: &sk_provider, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1165: error_f("failed to parse constraints");
1166: sshbuf_reset(e->request);
1167: goto out;
1168: }
1169:
1.238 djm 1170: if (sk_provider != NULL) {
1.240 markus 1171: if (!sshkey_is_sk(k)) {
1.255 naddy 1172: error("Cannot add provider: %s is not an "
1173: "authenticator-hosted key", sshkey_type(k));
1.271 djm 1174: goto out;
1.238 djm 1175: }
1.254 djm 1176: if (strcasecmp(sk_provider, "internal") == 0) {
1.266 djm 1177: debug_f("internal provider");
1.254 djm 1178: } else {
1179: if (realpath(sk_provider, canonical_provider) == NULL) {
1180: verbose("failed provider \"%.100s\": "
1181: "realpath: %s", sk_provider,
1182: strerror(errno));
1.271 djm 1183: goto out;
1.254 djm 1184: }
1.238 djm 1185: free(sk_provider);
1.254 djm 1186: sk_provider = xstrdup(canonical_provider);
1187: if (match_pattern_list(sk_provider,
1.260 djm 1188: allowed_providers, 0) != 1) {
1.254 djm 1189: error("Refusing add key: "
1.260 djm 1190: "provider %s not allowed", sk_provider);
1.271 djm 1191: goto out;
1.254 djm 1192: }
1.238 djm 1193: }
1.242 markus 1194: }
1195: if ((r = sshkey_shield_private(k)) != 0) {
1.266 djm 1196: error_fr(r, "shield private");
1.271 djm 1197: goto out;
1.238 djm 1198: }
1.106 marc 1199: if (lifetime && !death)
1.175 dtucker 1200: death = monotime() + lifetime;
1.221 djm 1201: if ((id = lookup_identity(k)) == NULL) {
1.163 markus 1202: id = xcalloc(1, sizeof(Identity));
1.221 djm 1203: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1.33 markus 1204: /* Increment the number of identities. */
1.221 djm 1205: idtab->nentries++;
1.33 markus 1206: } else {
1.281 djm 1207: /* identity not visible, do not update */
1208: if (identity_permitted(id, e, NULL, NULL, NULL) != 0)
1209: goto out; /* error already logged */
1.228 markus 1210: /* key state might have been updated */
1211: sshkey_free(id->key);
1.173 djm 1212: free(id->comment);
1.238 djm 1213: free(id->sk_provider);
1.281 djm 1214: free_dest_constraints(id->dest_constraints,
1215: id->ndest_constraints);
1.33 markus 1216: }
1.271 djm 1217: /* success */
1.228 markus 1218: id->key = k;
1.157 canacar 1219: id->comment = comment;
1220: id->death = death;
1221: id->confirm = confirm;
1.238 djm 1222: id->sk_provider = sk_provider;
1.281 djm 1223: id->dest_constraints = dest_constraints;
1224: id->ndest_constraints = ndest_constraints;
1.238 djm 1225:
1226: if ((fp = sshkey_fingerprint(k, SSH_FP_HASH_DEFAULT,
1227: SSH_FP_DEFAULT)) == NULL)
1.266 djm 1228: fatal_f("sshkey_fingerprint failed");
1229: debug_f("add %s %s \"%.100s\" (life: %u) (confirm: %u) "
1.281 djm 1230: "(provider: %s) (destination constraints: %zu)",
1231: sshkey_ssh_name(k), fp, comment, seconds, confirm,
1232: sk_provider == NULL ? "none" : sk_provider, ndest_constraints);
1.238 djm 1233: free(fp);
1.271 djm 1234: /* transferred */
1235: k = NULL;
1236: comment = NULL;
1237: sk_provider = NULL;
1.281 djm 1238: dest_constraints = NULL;
1239: ndest_constraints = 0;
1.271 djm 1240: success = 1;
1241: out:
1242: free(sk_provider);
1243: free(comment);
1244: sshkey_free(k);
1.281 djm 1245: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1246: send_status(e, success);
1.1 deraadt 1247: }
1248:
1.88 markus 1249: /* XXX todo: encrypt sensitive data with passphrase */
1250: static void
1251: process_lock_agent(SocketEntry *e, int lock)
1252: {
1.203 dtucker 1253: int r, success = 0, delay;
1.213 djm 1254: char *passwd;
1255: u_char passwdhash[LOCK_SIZE];
1.203 dtucker 1256: static u_int fail_count = 0;
1257: size_t pwlen;
1258:
1.269 djm 1259: debug2_f("entering");
1.226 djm 1260: /*
1261: * This is deliberately fatal: the user has requested that we lock,
1262: * but we can't parse their request properly. The only safe thing to
1263: * do is abort.
1264: */
1.203 dtucker 1265: if ((r = sshbuf_get_cstring(e->request, &passwd, &pwlen)) != 0)
1.266 djm 1266: fatal_fr(r, "parse");
1.203 dtucker 1267: if (pwlen == 0) {
1268: debug("empty password not supported");
1269: } else if (locked && !lock) {
1270: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1271: passwdhash, sizeof(passwdhash), LOCK_ROUNDS) < 0)
1272: fatal("bcrypt_pbkdf");
1.213 djm 1273: if (timingsafe_bcmp(passwdhash, lock_pwhash, LOCK_SIZE) == 0) {
1.203 dtucker 1274: debug("agent unlocked");
1275: locked = 0;
1276: fail_count = 0;
1.213 djm 1277: explicit_bzero(lock_pwhash, sizeof(lock_pwhash));
1.203 dtucker 1278: success = 1;
1279: } else {
1280: /* delay in 0.1s increments up to 10s */
1281: if (fail_count < 100)
1282: fail_count++;
1283: delay = 100000 * fail_count;
1284: debug("unlock failed, delaying %0.1lf seconds",
1285: (double)delay/1000000);
1286: usleep(delay);
1287: }
1288: explicit_bzero(passwdhash, sizeof(passwdhash));
1.88 markus 1289: } else if (!locked && lock) {
1.203 dtucker 1290: debug("agent locked");
1.88 markus 1291: locked = 1;
1.203 dtucker 1292: arc4random_buf(lock_salt, sizeof(lock_salt));
1293: if (bcrypt_pbkdf(passwd, pwlen, lock_salt, sizeof(lock_salt),
1.213 djm 1294: lock_pwhash, sizeof(lock_pwhash), LOCK_ROUNDS) < 0)
1.203 dtucker 1295: fatal("bcrypt_pbkdf");
1.88 markus 1296: success = 1;
1297: }
1.256 jsg 1298: freezero(passwd, pwlen);
1.194 markus 1299: send_status(e, success);
1.88 markus 1300: }
1301:
1302: static void
1.221 djm 1303: no_identities(SocketEntry *e)
1.88 markus 1304: {
1.194 markus 1305: struct sshbuf *msg;
1306: int r;
1.88 markus 1307:
1.194 markus 1308: if ((msg = sshbuf_new()) == NULL)
1.266 djm 1309: fatal_f("sshbuf_new failed");
1.221 djm 1310: if ((r = sshbuf_put_u8(msg, SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
1.194 markus 1311: (r = sshbuf_put_u32(msg, 0)) != 0 ||
1312: (r = sshbuf_put_stringb(e->output, msg)) != 0)
1.266 djm 1313: fatal_fr(r, "compose");
1.194 markus 1314: sshbuf_free(msg);
1.88 markus 1315: }
1.59 markus 1316:
1.163 markus 1317: #ifdef ENABLE_PKCS11
1.59 markus 1318: static void
1.158 djm 1319: process_add_smartcard_key(SocketEntry *e)
1.59 markus 1320: {
1.226 djm 1321: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.253 djm 1322: char **comments = NULL;
1.221 djm 1323: int r, i, count = 0, success = 0, confirm = 0;
1.271 djm 1324: u_int seconds = 0;
1.174 dtucker 1325: time_t death = 0;
1.194 markus 1326: struct sshkey **keys = NULL, *k;
1.84 markus 1327: Identity *id;
1.281 djm 1328: struct dest_constraint *dest_constraints = NULL;
1329: size_t ndest_constraints = 0;
1.75 deraadt 1330:
1.269 djm 1331: debug2_f("entering");
1.194 markus 1332: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1333: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1334: error_fr(r, "parse");
1.226 djm 1335: goto send;
1336: }
1.271 djm 1337: if (parse_key_constraints(e->request, NULL, &death, &seconds, &confirm,
1.281 djm 1338: NULL, &dest_constraints, &ndest_constraints) != 0) {
1.271 djm 1339: error_f("failed to parse constraints");
1340: goto send;
1.110 djm 1341: }
1.215 djm 1342: if (realpath(provider, canonical_provider) == NULL) {
1343: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1344: provider, strerror(errno));
1345: goto send;
1346: }
1.260 djm 1347: if (match_pattern_list(canonical_provider, allowed_providers, 0) != 1) {
1.215 djm 1348: verbose("refusing PKCS#11 add of \"%.100s\": "
1.260 djm 1349: "provider not allowed", canonical_provider);
1.215 djm 1350: goto send;
1351: }
1.266 djm 1352: debug_f("add %.100s", canonical_provider);
1.110 djm 1353: if (lifetime && !death)
1.175 dtucker 1354: death = monotime() + lifetime;
1.110 djm 1355:
1.253 djm 1356: count = pkcs11_add_provider(canonical_provider, pin, &keys, &comments);
1.163 markus 1357: for (i = 0; i < count; i++) {
1.84 markus 1358: k = keys[i];
1.221 djm 1359: if (lookup_identity(k) == NULL) {
1.163 markus 1360: id = xcalloc(1, sizeof(Identity));
1.84 markus 1361: id->key = k;
1.253 djm 1362: keys[i] = NULL; /* transferred */
1.215 djm 1363: id->provider = xstrdup(canonical_provider);
1.253 djm 1364: if (*comments[i] != '\0') {
1365: id->comment = comments[i];
1366: comments[i] = NULL; /* transferred */
1367: } else {
1368: id->comment = xstrdup(canonical_provider);
1369: }
1.110 djm 1370: id->death = death;
1371: id->confirm = confirm;
1.281 djm 1372: id->dest_constraints = dest_constraints;
1373: id->ndest_constraints = ndest_constraints;
1374: dest_constraints = NULL; /* transferred */
1375: ndest_constraints = 0;
1.221 djm 1376: TAILQ_INSERT_TAIL(&idtab->idlist, id, next);
1377: idtab->nentries++;
1.84 markus 1378: success = 1;
1379: }
1.271 djm 1380: /* XXX update constraints for existing keys */
1.253 djm 1381: sshkey_free(keys[i]);
1382: free(comments[i]);
1.59 markus 1383: }
1384: send:
1.173 djm 1385: free(pin);
1386: free(provider);
1387: free(keys);
1.253 djm 1388: free(comments);
1.281 djm 1389: free_dest_constraints(dest_constraints, ndest_constraints);
1.194 markus 1390: send_status(e, success);
1.59 markus 1391: }
1392:
1393: static void
1394: process_remove_smartcard_key(SocketEntry *e)
1395: {
1.217 djm 1396: char *provider = NULL, *pin = NULL, canonical_provider[PATH_MAX];
1.221 djm 1397: int r, success = 0;
1.163 markus 1398: Identity *id, *nxt;
1.59 markus 1399:
1.269 djm 1400: debug2_f("entering");
1.194 markus 1401: if ((r = sshbuf_get_cstring(e->request, &provider, NULL)) != 0 ||
1.226 djm 1402: (r = sshbuf_get_cstring(e->request, &pin, NULL)) != 0) {
1.266 djm 1403: error_fr(r, "parse");
1.226 djm 1404: goto send;
1405: }
1.173 djm 1406: free(pin);
1.59 markus 1407:
1.217 djm 1408: if (realpath(provider, canonical_provider) == NULL) {
1409: verbose("failed PKCS#11 add of \"%.100s\": realpath: %s",
1410: provider, strerror(errno));
1411: goto send;
1412: }
1413:
1.266 djm 1414: debug_f("remove %.100s", canonical_provider);
1.221 djm 1415: for (id = TAILQ_FIRST(&idtab->idlist); id; id = nxt) {
1416: nxt = TAILQ_NEXT(id, next);
1417: /* Skip file--based keys */
1418: if (id->provider == NULL)
1419: continue;
1420: if (!strcmp(canonical_provider, id->provider)) {
1421: TAILQ_REMOVE(&idtab->idlist, id, next);
1422: free_identity(id);
1423: idtab->nentries--;
1.59 markus 1424: }
1425: }
1.217 djm 1426: if (pkcs11_del_provider(canonical_provider) == 0)
1.163 markus 1427: success = 1;
1428: else
1.266 djm 1429: error_f("pkcs11_del_provider failed");
1.218 deraadt 1430: send:
1.173 djm 1431: free(provider);
1.194 markus 1432: send_status(e, success);
1.59 markus 1433: }
1.163 markus 1434: #endif /* ENABLE_PKCS11 */
1.59 markus 1435:
1.280 djm 1436: static int
1437: process_ext_session_bind(SocketEntry *e)
1438: {
1439: int r, sid_match, key_match;
1440: struct sshkey *key = NULL;
1441: struct sshbuf *sid = NULL, *sig = NULL;
1442: char *fp = NULL;
1443: size_t i;
1.281 djm 1444: u_char fwd = 0;
1.280 djm 1445:
1446: debug2_f("entering");
1447: if ((r = sshkey_froms(e->request, &key)) != 0 ||
1448: (r = sshbuf_froms(e->request, &sid)) != 0 ||
1449: (r = sshbuf_froms(e->request, &sig)) != 0 ||
1450: (r = sshbuf_get_u8(e->request, &fwd)) != 0) {
1451: error_fr(r, "parse");
1452: goto out;
1453: }
1454: if ((fp = sshkey_fingerprint(key, SSH_FP_HASH_DEFAULT,
1455: SSH_FP_DEFAULT)) == NULL)
1456: fatal_f("fingerprint failed");
1457: /* check signature with hostkey on session ID */
1458: if ((r = sshkey_verify(key, sshbuf_ptr(sig), sshbuf_len(sig),
1459: sshbuf_ptr(sid), sshbuf_len(sid), NULL, 0, NULL)) != 0) {
1460: error_fr(r, "sshkey_verify for %s %s", sshkey_type(key), fp);
1461: goto out;
1462: }
1463: /* check whether sid/key already recorded */
1464: for (i = 0; i < e->nsession_ids; i++) {
1.281 djm 1465: if (!e->session_ids[i].forwarded) {
1466: error_f("attempt to bind session ID to socket "
1467: "previously bound for authentication attempt");
1468: r = -1;
1469: goto out;
1470: }
1.280 djm 1471: sid_match = buf_equal(sid, e->session_ids[i].sid) == 0;
1472: key_match = sshkey_equal(key, e->session_ids[i].key);
1473: if (sid_match && key_match) {
1474: debug_f("session ID already recorded for %s %s",
1475: sshkey_type(key), fp);
1476: r = 0;
1477: goto out;
1478: } else if (sid_match) {
1479: error_f("session ID recorded against different key "
1480: "for %s %s", sshkey_type(key), fp);
1481: r = -1;
1482: goto out;
1483: }
1484: /*
1485: * new sid with previously-seen key can happen, e.g. multiple
1486: * connections to the same host.
1487: */
1488: }
1489: /* record new key/sid */
1490: if (e->nsession_ids >= AGENT_MAX_SESSION_IDS) {
1491: error_f("too many session IDs recorded");
1492: goto out;
1493: }
1494: e->session_ids = xrecallocarray(e->session_ids, e->nsession_ids,
1495: e->nsession_ids + 1, sizeof(*e->session_ids));
1496: i = e->nsession_ids++;
1497: debug_f("recorded %s %s (slot %zu of %d)", sshkey_type(key), fp, i,
1498: AGENT_MAX_SESSION_IDS);
1499: e->session_ids[i].key = key;
1500: e->session_ids[i].forwarded = fwd != 0;
1501: key = NULL; /* transferred */
1502: /* can't transfer sid; it's refcounted and scoped to request's life */
1503: if ((e->session_ids[i].sid = sshbuf_new()) == NULL)
1504: fatal_f("sshbuf_new");
1505: if ((r = sshbuf_putb(e->session_ids[i].sid, sid)) != 0)
1506: fatal_fr(r, "sshbuf_putb session ID");
1507: /* success */
1508: r = 0;
1509: out:
1510: sshkey_free(key);
1511: sshbuf_free(sid);
1512: sshbuf_free(sig);
1513: return r == 0 ? 1 : 0;
1514: }
1515:
1516: static void
1517: process_extension(SocketEntry *e)
1518: {
1519: int r, success = 0;
1520: char *name;
1521:
1522: debug2_f("entering");
1523: if ((r = sshbuf_get_cstring(e->request, &name, NULL)) != 0) {
1524: error_fr(r, "parse");
1525: goto send;
1526: }
1527: if (strcmp(name, "session-bind@openssh.com") == 0)
1528: success = process_ext_session_bind(e);
1529: else
1530: debug_f("unsupported extension \"%s\"", name);
1531: send:
1532: send_status(e, success);
1533: }
1.264 djm 1534: /*
1535: * dispatch incoming message.
1536: * returns 1 on success, 0 for incomplete messages or -1 on error.
1537: */
1.223 djm 1538: static int
1539: process_message(u_int socknum)
1.1 deraadt 1540: {
1.194 markus 1541: u_int msg_len;
1542: u_char type;
1543: const u_char *cp;
1544: int r;
1.223 djm 1545: SocketEntry *e;
1546:
1.266 djm 1547: if (socknum >= sockets_alloc)
1548: fatal_f("sock %u >= allocated %u", socknum, sockets_alloc);
1.223 djm 1549: e = &sockets[socknum];
1.89 markus 1550:
1.194 markus 1551: if (sshbuf_len(e->input) < 5)
1.223 djm 1552: return 0; /* Incomplete message header. */
1.194 markus 1553: cp = sshbuf_ptr(e->input);
1554: msg_len = PEEK_U32(cp);
1.223 djm 1555: if (msg_len > AGENT_MAX_LEN) {
1.266 djm 1556: debug_f("socket %u (fd=%d) message too long %u > %u",
1557: socknum, e->fd, msg_len, AGENT_MAX_LEN);
1.223 djm 1558: return -1;
1.21 markus 1559: }
1.194 markus 1560: if (sshbuf_len(e->input) < msg_len + 4)
1.223 djm 1561: return 0; /* Incomplete message body. */
1.87 markus 1562:
1563: /* move the current input to e->request */
1.194 markus 1564: sshbuf_reset(e->request);
1565: if ((r = sshbuf_get_stringb(e->input, e->request)) != 0 ||
1.223 djm 1566: (r = sshbuf_get_u8(e->request, &type)) != 0) {
1567: if (r == SSH_ERR_MESSAGE_INCOMPLETE ||
1568: r == SSH_ERR_STRING_TOO_LARGE) {
1.266 djm 1569: error_fr(r, "parse");
1.223 djm 1570: return -1;
1571: }
1.266 djm 1572: fatal_fr(r, "parse");
1.223 djm 1573: }
1574:
1.266 djm 1575: debug_f("socket %u (fd=%d) type %d", socknum, e->fd, type);
1.21 markus 1576:
1.230 djm 1577: /* check whether agent is locked */
1.88 markus 1578: if (locked && type != SSH_AGENTC_UNLOCK) {
1.194 markus 1579: sshbuf_reset(e->request);
1.88 markus 1580: switch (type) {
1581: case SSH2_AGENTC_REQUEST_IDENTITIES:
1582: /* send empty lists */
1.221 djm 1583: no_identities(e);
1.88 markus 1584: break;
1585: default:
1586: /* send a fail message for all other request types */
1.194 markus 1587: send_status(e, 0);
1.88 markus 1588: }
1.264 djm 1589: return 1;
1.88 markus 1590: }
1591:
1.21 markus 1592: switch (type) {
1.88 markus 1593: case SSH_AGENTC_LOCK:
1594: case SSH_AGENTC_UNLOCK:
1595: process_lock_agent(e, type == SSH_AGENTC_LOCK);
1596: break;
1.21 markus 1597: case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
1.221 djm 1598: process_remove_all_identities(e); /* safe for !WITH_SSH1 */
1.33 markus 1599: break;
1600: /* ssh2 */
1601: case SSH2_AGENTC_SIGN_REQUEST:
1602: process_sign_request2(e);
1603: break;
1604: case SSH2_AGENTC_REQUEST_IDENTITIES:
1.221 djm 1605: process_request_identities(e);
1.33 markus 1606: break;
1607: case SSH2_AGENTC_ADD_IDENTITY:
1.94 markus 1608: case SSH2_AGENTC_ADD_ID_CONSTRAINED:
1.221 djm 1609: process_add_identity(e);
1.33 markus 1610: break;
1611: case SSH2_AGENTC_REMOVE_IDENTITY:
1.221 djm 1612: process_remove_identity(e);
1.33 markus 1613: break;
1614: case SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
1.221 djm 1615: process_remove_all_identities(e);
1.21 markus 1616: break;
1.163 markus 1617: #ifdef ENABLE_PKCS11
1.59 markus 1618: case SSH_AGENTC_ADD_SMARTCARD_KEY:
1.110 djm 1619: case SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED:
1.59 markus 1620: process_add_smartcard_key(e);
1.75 deraadt 1621: break;
1.59 markus 1622: case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
1623: process_remove_smartcard_key(e);
1.75 deraadt 1624: break;
1.163 markus 1625: #endif /* ENABLE_PKCS11 */
1.280 djm 1626: case SSH_AGENTC_EXTENSION:
1627: process_extension(e);
1628: break;
1.21 markus 1629: default:
1630: /* Unknown message. Respond with failure. */
1631: error("Unknown message %d", type);
1.194 markus 1632: sshbuf_reset(e->request);
1633: send_status(e, 0);
1.21 markus 1634: break;
1635: }
1.264 djm 1636: return 1;
1.1 deraadt 1637: }
1638:
1.55 itojun 1639: static void
1.73 stevesk 1640: new_socket(sock_type type, int fd)
1.1 deraadt 1641: {
1.112 markus 1642: u_int i, old_alloc, new_alloc;
1.96 deraadt 1643:
1.269 djm 1644: debug_f("type = %s", type == AUTH_CONNECTION ? "CONNECTION" :
1645: (type == AUTH_SOCKET ? "SOCKET" : "UNKNOWN"));
1.119 djm 1646: set_nonblock(fd);
1.21 markus 1647:
1648: if (fd > max_fd)
1649: max_fd = fd;
1650:
1651: for (i = 0; i < sockets_alloc; i++)
1652: if (sockets[i].type == AUTH_UNUSED) {
1653: sockets[i].fd = fd;
1.266 djm 1654: if ((sockets[i].input = sshbuf_new()) == NULL ||
1655: (sockets[i].output = sshbuf_new()) == NULL ||
1656: (sockets[i].request = sshbuf_new()) == NULL)
1657: fatal_f("sshbuf_new failed");
1.112 markus 1658: sockets[i].type = type;
1.21 markus 1659: return;
1660: }
1661: old_alloc = sockets_alloc;
1.112 markus 1662: new_alloc = sockets_alloc + 10;
1.269 djm 1663: sockets = xrecallocarray(sockets, old_alloc, new_alloc,
1664: sizeof(sockets[0]));
1.112 markus 1665: for (i = old_alloc; i < new_alloc; i++)
1.21 markus 1666: sockets[i].type = AUTH_UNUSED;
1.112 markus 1667: sockets_alloc = new_alloc;
1.21 markus 1668: sockets[old_alloc].fd = fd;
1.266 djm 1669: if ((sockets[old_alloc].input = sshbuf_new()) == NULL ||
1670: (sockets[old_alloc].output = sshbuf_new()) == NULL ||
1671: (sockets[old_alloc].request = sshbuf_new()) == NULL)
1672: fatal_f("sshbuf_new failed");
1.112 markus 1673: sockets[old_alloc].type = type;
1.1 deraadt 1674: }
1675:
1.55 itojun 1676: static int
1.223 djm 1677: handle_socket_read(u_int socknum)
1.1 deraadt 1678: {
1.223 djm 1679: struct sockaddr_un sunaddr;
1680: socklen_t slen;
1681: uid_t euid;
1682: gid_t egid;
1683: int fd;
1684:
1685: slen = sizeof(sunaddr);
1686: fd = accept(sockets[socknum].fd, (struct sockaddr *)&sunaddr, &slen);
1.237 deraadt 1687: if (fd == -1) {
1.223 djm 1688: error("accept from AUTH_SOCKET: %s", strerror(errno));
1689: return -1;
1690: }
1.237 deraadt 1691: if (getpeereid(fd, &euid, &egid) == -1) {
1.223 djm 1692: error("getpeereid %d failed: %s", fd, strerror(errno));
1693: close(fd);
1694: return -1;
1695: }
1696: if ((euid != 0) && (getuid() != euid)) {
1697: error("uid mismatch: peer euid %u != uid %u",
1698: (u_int) euid, (u_int) getuid());
1699: close(fd);
1700: return -1;
1701: }
1702: new_socket(AUTH_CONNECTION, fd);
1703: return 0;
1704: }
1705:
1706: static int
1707: handle_conn_read(u_int socknum)
1708: {
1.233 djm 1709: char buf[AGENT_RBUF_LEN];
1.223 djm 1710: ssize_t len;
1711: int r;
1712:
1713: if ((len = read(sockets[socknum].fd, buf, sizeof(buf))) <= 0) {
1714: if (len == -1) {
1715: if (errno == EAGAIN || errno == EINTR)
1716: return 0;
1.266 djm 1717: error_f("read error on socket %u (fd %d): %s",
1718: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1719: }
1720: return -1;
1721: }
1722: if ((r = sshbuf_put(sockets[socknum].input, buf, len)) != 0)
1.266 djm 1723: fatal_fr(r, "compose");
1.223 djm 1724: explicit_bzero(buf, sizeof(buf));
1.264 djm 1725: for (;;) {
1726: if ((r = process_message(socknum)) == -1)
1727: return -1;
1728: else if (r == 0)
1729: break;
1730: }
1.223 djm 1731: return 0;
1732: }
1733:
1734: static int
1735: handle_conn_write(u_int socknum)
1736: {
1737: ssize_t len;
1738: int r;
1739:
1740: if (sshbuf_len(sockets[socknum].output) == 0)
1741: return 0; /* shouldn't happen */
1742: if ((len = write(sockets[socknum].fd,
1743: sshbuf_ptr(sockets[socknum].output),
1744: sshbuf_len(sockets[socknum].output))) <= 0) {
1745: if (len == -1) {
1746: if (errno == EAGAIN || errno == EINTR)
1747: return 0;
1.266 djm 1748: error_f("read error on socket %u (fd %d): %s",
1749: socknum, sockets[socknum].fd, strerror(errno));
1.223 djm 1750: }
1751: return -1;
1752: }
1753: if ((r = sshbuf_consume(sockets[socknum].output, len)) != 0)
1.266 djm 1754: fatal_fr(r, "consume");
1.223 djm 1755: return 0;
1756: }
1757:
1758: static void
1.231 djm 1759: after_poll(struct pollfd *pfd, size_t npfd, u_int maxfds)
1.223 djm 1760: {
1761: size_t i;
1.231 djm 1762: u_int socknum, activefds = npfd;
1.223 djm 1763:
1764: for (i = 0; i < npfd; i++) {
1765: if (pfd[i].revents == 0)
1766: continue;
1767: /* Find sockets entry */
1768: for (socknum = 0; socknum < sockets_alloc; socknum++) {
1769: if (sockets[socknum].type != AUTH_SOCKET &&
1770: sockets[socknum].type != AUTH_CONNECTION)
1771: continue;
1772: if (pfd[i].fd == sockets[socknum].fd)
1773: break;
1774: }
1775: if (socknum >= sockets_alloc) {
1.266 djm 1776: error_f("no socket for fd %d", pfd[i].fd);
1.223 djm 1777: continue;
1778: }
1779: /* Process events */
1780: switch (sockets[socknum].type) {
1781: case AUTH_SOCKET:
1.231 djm 1782: if ((pfd[i].revents & (POLLIN|POLLERR)) == 0)
1783: break;
1784: if (npfd > maxfds) {
1785: debug3("out of fds (active %u >= limit %u); "
1786: "skipping accept", activefds, maxfds);
1787: break;
1788: }
1789: if (handle_socket_read(socknum) == 0)
1790: activefds++;
1.223 djm 1791: break;
1792: case AUTH_CONNECTION:
1.279 djm 1793: if ((pfd[i].revents & (POLLIN|POLLHUP|POLLERR)) != 0 &&
1794: handle_conn_read(socknum) != 0)
1.231 djm 1795: goto close_sock;
1796: if ((pfd[i].revents & (POLLOUT|POLLHUP)) != 0 &&
1797: handle_conn_write(socknum) != 0) {
1798: close_sock:
1799: if (activefds == 0)
1800: fatal("activefds == 0 at close_sock");
1.223 djm 1801: close_socket(&sockets[socknum]);
1.231 djm 1802: activefds--;
1.223 djm 1803: break;
1804: }
1805: break;
1806: default:
1807: break;
1808: }
1809: }
1810: }
1811:
1812: static int
1.231 djm 1813: prepare_poll(struct pollfd **pfdp, size_t *npfdp, int *timeoutp, u_int maxfds)
1.223 djm 1814: {
1815: struct pollfd *pfd = *pfdp;
1816: size_t i, j, npfd = 0;
1.174 dtucker 1817: time_t deadline;
1.233 djm 1818: int r;
1.46 markus 1819:
1.223 djm 1820: /* Count active sockets */
1.46 markus 1821: for (i = 0; i < sockets_alloc; i++) {
1.21 markus 1822: switch (sockets[i].type) {
1823: case AUTH_SOCKET:
1824: case AUTH_CONNECTION:
1.223 djm 1825: npfd++;
1.21 markus 1826: break;
1827: case AUTH_UNUSED:
1828: break;
1829: default:
1830: fatal("Unknown socket type %d", sockets[i].type);
1831: break;
1832: }
1.46 markus 1833: }
1.223 djm 1834: if (npfd != *npfdp &&
1835: (pfd = recallocarray(pfd, *npfdp, npfd, sizeof(*pfd))) == NULL)
1.266 djm 1836: fatal_f("recallocarray failed");
1.223 djm 1837: *pfdp = pfd;
1838: *npfdp = npfd;
1.46 markus 1839:
1.223 djm 1840: for (i = j = 0; i < sockets_alloc; i++) {
1.46 markus 1841: switch (sockets[i].type) {
1842: case AUTH_SOCKET:
1.231 djm 1843: if (npfd > maxfds) {
1844: debug3("out of fds (active %zu >= limit %u); "
1845: "skipping arming listener", npfd, maxfds);
1846: break;
1847: }
1848: pfd[j].fd = sockets[i].fd;
1849: pfd[j].revents = 0;
1850: pfd[j].events = POLLIN;
1851: j++;
1852: break;
1.46 markus 1853: case AUTH_CONNECTION:
1.223 djm 1854: pfd[j].fd = sockets[i].fd;
1855: pfd[j].revents = 0;
1.233 djm 1856: /*
1857: * Only prepare to read if we can handle a full-size
1858: * input read buffer and enqueue a max size reply..
1859: */
1860: if ((r = sshbuf_check_reserve(sockets[i].input,
1861: AGENT_RBUF_LEN)) == 0 &&
1862: (r = sshbuf_check_reserve(sockets[i].output,
1.278 djm 1863: AGENT_MAX_LEN)) == 0)
1.233 djm 1864: pfd[j].events = POLLIN;
1.266 djm 1865: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1866: fatal_fr(r, "reserve");
1.194 markus 1867: if (sshbuf_len(sockets[i].output) > 0)
1.223 djm 1868: pfd[j].events |= POLLOUT;
1869: j++;
1.46 markus 1870: break;
1871: default:
1872: break;
1873: }
1874: }
1.155 dtucker 1875: deadline = reaper();
1876: if (parent_alive_interval != 0)
1877: deadline = (deadline == 0) ? parent_alive_interval :
1.214 deraadt 1878: MINIMUM(deadline, parent_alive_interval);
1.155 dtucker 1879: if (deadline == 0) {
1.224 djm 1880: *timeoutp = -1; /* INFTIM */
1.155 dtucker 1881: } else {
1.223 djm 1882: if (deadline > INT_MAX / 1000)
1883: *timeoutp = INT_MAX / 1000;
1884: else
1885: *timeoutp = deadline * 1000;
1.155 dtucker 1886: }
1.46 markus 1887: return (1);
1.21 markus 1888: }
1889:
1.55 itojun 1890: static void
1.113 markus 1891: cleanup_socket(void)
1.15 markus 1892: {
1.187 djm 1893: if (cleanup_pid != 0 && getpid() != cleanup_pid)
1894: return;
1.266 djm 1895: debug_f("cleanup");
1.48 deraadt 1896: if (socket_name[0])
1897: unlink(socket_name);
1898: if (socket_dir[0])
1899: rmdir(socket_dir);
1.10 markus 1900: }
1901:
1.114 markus 1902: void
1.15 markus 1903: cleanup_exit(int i)
1904: {
1.113 markus 1905: cleanup_socket();
1906: _exit(i);
1.15 markus 1907: }
1908:
1.135 deraadt 1909: /*ARGSUSED*/
1.55 itojun 1910: static void
1.48 deraadt 1911: cleanup_handler(int sig)
1912: {
1.113 markus 1913: cleanup_socket();
1.163 markus 1914: #ifdef ENABLE_PKCS11
1915: pkcs11_terminate();
1916: #endif
1.48 deraadt 1917: _exit(2);
1.113 markus 1918: }
1919:
1.68 markus 1920: static void
1.155 dtucker 1921: check_parent_exists(void)
1.68 markus 1922: {
1.172 dtucker 1923: /*
1924: * If our parent has exited then getppid() will return (pid_t)1,
1925: * so testing for that should be safe.
1926: */
1927: if (parent_pid != -1 && getppid() != parent_pid) {
1.68 markus 1928: /* printf("Parent has died - Authentication agent exiting.\n"); */
1.155 dtucker 1929: cleanup_socket();
1930: _exit(2);
1.68 markus 1931: }
1.48 deraadt 1932: }
1933:
1.55 itojun 1934: static void
1.50 itojun 1935: usage(void)
1.15 markus 1936: {
1.184 deraadt 1937: fprintf(stderr,
1.250 jmc 1938: "usage: ssh-agent [-c | -s] [-Dd] [-a bind_address] [-E fingerprint_hash]\n"
1.261 jmc 1939: " [-P allowed_providers] [-t life]\n"
1.260 djm 1940: " ssh-agent [-a bind_address] [-E fingerprint_hash] [-P allowed_providers]\n"
1.259 dtucker 1941: " [-t life] command [arg ...]\n"
1.250 jmc 1942: " ssh-agent [-c | -s] -k\n");
1.21 markus 1943: exit(1);
1.15 markus 1944: }
1945:
1.2 provos 1946: int
1947: main(int ac, char **av)
1.1 deraadt 1948: {
1.201 djm 1949: int c_flag = 0, d_flag = 0, D_flag = 0, k_flag = 0, s_flag = 0;
1.265 djm 1950: int sock, ch, result, saved_errno;
1.96 deraadt 1951: char *shell, *format, *pidstr, *agentsocket = NULL;
1.41 markus 1952: struct rlimit rlim;
1.96 deraadt 1953: extern int optind;
1.98 stevesk 1954: extern char *optarg;
1.21 markus 1955: pid_t pid;
1.96 deraadt 1956: char pidstrbuf[1 + 3 * sizeof pid];
1.161 tobias 1957: size_t len;
1.189 djm 1958: mode_t prev_mask;
1.224 djm 1959: int timeout = -1; /* INFTIM */
1.223 djm 1960: struct pollfd *pfd = NULL;
1961: size_t npfd = 0;
1.231 djm 1962: u_int maxfds;
1.123 djm 1963:
1964: /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1965: sanitise_stdfd();
1.99 markus 1966:
1967: /* drop */
1968: setegid(getgid());
1969: setgid(getgid());
1.53 markus 1970:
1.231 djm 1971: if (getrlimit(RLIMIT_NOFILE, &rlim) == -1)
1972: fatal("%s: getrlimit: %s", __progname, strerror(errno));
1973:
1.185 markus 1974: #ifdef WITH_OPENSSL
1.170 djm 1975: OpenSSL_add_all_algorithms();
1.185 markus 1976: #endif
1.21 markus 1977:
1.258 djm 1978: while ((ch = getopt(ac, av, "cDdksE:a:O:P:t:")) != -1) {
1.21 markus 1979: switch (ch) {
1.192 djm 1980: case 'E':
1981: fingerprint_hash = ssh_digest_alg_by_name(optarg);
1982: if (fingerprint_hash == -1)
1983: fatal("Invalid hash algorithm \"%s\"", optarg);
1984: break;
1.21 markus 1985: case 'c':
1986: if (s_flag)
1987: usage();
1988: c_flag++;
1989: break;
1990: case 'k':
1991: k_flag++;
1.258 djm 1992: break;
1993: case 'O':
1994: if (strcmp(optarg, "no-restrict-websafe") == 0)
1995: restrict_websafe = 0;
1996: else
1997: fatal("Unknown -O option");
1.21 markus 1998: break;
1.215 djm 1999: case 'P':
1.260 djm 2000: if (allowed_providers != NULL)
1.215 djm 2001: fatal("-P option already specified");
1.260 djm 2002: allowed_providers = xstrdup(optarg);
1.215 djm 2003: break;
1.21 markus 2004: case 's':
2005: if (c_flag)
2006: usage();
2007: s_flag++;
2008: break;
1.57 markus 2009: case 'd':
1.201 djm 2010: if (d_flag || D_flag)
1.57 markus 2011: usage();
2012: d_flag++;
2013: break;
1.201 djm 2014: case 'D':
2015: if (d_flag || D_flag)
2016: usage();
2017: D_flag++;
2018: break;
1.86 markus 2019: case 'a':
2020: agentsocket = optarg;
1.106 marc 2021: break;
2022: case 't':
2023: if ((lifetime = convtime(optarg)) == -1) {
2024: fprintf(stderr, "Invalid lifetime\n");
2025: usage();
2026: }
1.86 markus 2027: break;
1.21 markus 2028: default:
2029: usage();
2030: }
2031: }
2032: ac -= optind;
2033: av += optind;
2034:
1.201 djm 2035: if (ac > 0 && (c_flag || k_flag || s_flag || d_flag || D_flag))
1.21 markus 2036: usage();
2037:
1.260 djm 2038: if (allowed_providers == NULL)
1.262 djm 2039: allowed_providers = xstrdup(DEFAULT_ALLOWED_PROVIDERS);
1.215 djm 2040:
1.85 markus 2041: if (ac == 0 && !c_flag && !s_flag) {
1.21 markus 2042: shell = getenv("SHELL");
1.161 tobias 2043: if (shell != NULL && (len = strlen(shell)) > 2 &&
2044: strncmp(shell + len - 3, "csh", 3) == 0)
1.21 markus 2045: c_flag = 1;
2046: }
2047: if (k_flag) {
1.136 deraadt 2048: const char *errstr = NULL;
2049:
1.21 markus 2050: pidstr = getenv(SSH_AGENTPID_ENV_NAME);
2051: if (pidstr == NULL) {
2052: fprintf(stderr, "%s not set, cannot kill agent\n",
1.46 markus 2053: SSH_AGENTPID_ENV_NAME);
1.21 markus 2054: exit(1);
2055: }
1.136 deraadt 2056: pid = (int)strtonum(pidstr, 2, INT_MAX, &errstr);
2057: if (errstr) {
2058: fprintf(stderr,
2059: "%s=\"%s\", which is not a good PID: %s\n",
2060: SSH_AGENTPID_ENV_NAME, pidstr, errstr);
1.21 markus 2061: exit(1);
2062: }
2063: if (kill(pid, SIGTERM) == -1) {
2064: perror("kill");
2065: exit(1);
2066: }
2067: format = c_flag ? "unsetenv %s;\n" : "unset %s;\n";
1.140 djm 2068: printf(format, SSH_AUTHSOCKET_ENV_NAME);
2069: printf(format, SSH_AGENTPID_ENV_NAME);
1.91 mpech 2070: printf("echo Agent pid %ld killed;\n", (long)pid);
1.21 markus 2071: exit(0);
2072: }
1.231 djm 2073:
2074: /*
2075: * Minimum file descriptors:
2076: * stdio (3) + listener (1) + syslog (1 maybe) + connection (1) +
2077: * a few spare for libc / stack protectors / sanitisers, etc.
2078: */
2079: #define SSH_AGENT_MIN_FDS (3+1+1+1+4)
2080: if (rlim.rlim_cur < SSH_AGENT_MIN_FDS)
1.232 djm 2081: fatal("%s: file descriptor rlimit %lld too low (minimum %u)",
1.231 djm 2082: __progname, (long long)rlim.rlim_cur, SSH_AGENT_MIN_FDS);
2083: maxfds = rlim.rlim_cur - SSH_AGENT_MIN_FDS;
2084:
1.21 markus 2085: parent_pid = getpid();
2086:
1.86 markus 2087: if (agentsocket == NULL) {
2088: /* Create private directory for agent socket */
1.171 djm 2089: mktemp_proto(socket_dir, sizeof(socket_dir));
1.86 markus 2090: if (mkdtemp(socket_dir) == NULL) {
2091: perror("mkdtemp: private socket dir");
2092: exit(1);
2093: }
1.91 mpech 2094: snprintf(socket_name, sizeof socket_name, "%s/agent.%ld", socket_dir,
2095: (long)parent_pid);
1.86 markus 2096: } else {
2097: /* Try to use specified agent socket */
2098: socket_dir[0] = '\0';
2099: strlcpy(socket_name, agentsocket, sizeof socket_name);
1.21 markus 2100: }
2101:
1.23 markus 2102: /*
2103: * Create socket early so it will exist before command gets run from
2104: * the parent.
2105: */
1.189 djm 2106: prev_mask = umask(0177);
1.188 millert 2107: sock = unix_listener(socket_name, SSH_LISTEN_BACKLOG, 0);
1.21 markus 2108: if (sock < 0) {
1.188 millert 2109: /* XXX - unix_listener() calls error() not perror() */
1.121 djm 2110: *socket_name = '\0'; /* Don't unlink any existing file */
1.21 markus 2111: cleanup_exit(1);
2112: }
1.189 djm 2113: umask(prev_mask);
1.46 markus 2114:
1.23 markus 2115: /*
2116: * Fork, and have the parent execute the command, if any, or present
2117: * the socket data. The child continues as the authentication agent.
2118: */
1.201 djm 2119: if (D_flag || d_flag) {
2120: log_init(__progname,
2121: d_flag ? SYSLOG_LEVEL_DEBUG3 : SYSLOG_LEVEL_INFO,
2122: SYSLOG_FACILITY_AUTH, 1);
1.57 markus 2123: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2124: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
2125: SSH_AUTHSOCKET_ENV_NAME);
1.91 mpech 2126: printf("echo Agent pid %ld;\n", (long)parent_pid);
1.210 dtucker 2127: fflush(stdout);
1.57 markus 2128: goto skip;
2129: }
1.21 markus 2130: pid = fork();
2131: if (pid == -1) {
2132: perror("fork");
1.81 stevesk 2133: cleanup_exit(1);
1.21 markus 2134: }
2135: if (pid != 0) { /* Parent - execute the given command. */
2136: close(sock);
1.91 mpech 2137: snprintf(pidstrbuf, sizeof pidstrbuf, "%ld", (long)pid);
1.21 markus 2138: if (ac == 0) {
2139: format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n";
2140: printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name,
1.46 markus 2141: SSH_AUTHSOCKET_ENV_NAME);
1.21 markus 2142: printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf,
1.46 markus 2143: SSH_AGENTPID_ENV_NAME);
1.91 mpech 2144: printf("echo Agent pid %ld;\n", (long)pid);
1.21 markus 2145: exit(0);
2146: }
1.36 deraadt 2147: if (setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1) == -1 ||
2148: setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1) == -1) {
2149: perror("setenv");
2150: exit(1);
2151: }
1.21 markus 2152: execvp(av[0], av);
2153: perror(av[0]);
2154: exit(1);
2155: }
1.81 stevesk 2156: /* child */
2157: log_init(__progname, SYSLOG_LEVEL_INFO, SYSLOG_FACILITY_AUTH, 0);
1.67 stevesk 2158:
2159: if (setsid() == -1) {
1.81 stevesk 2160: error("setsid: %s", strerror(errno));
1.67 stevesk 2161: cleanup_exit(1);
2162: }
2163:
2164: (void)chdir("/");
1.265 djm 2165: if (stdfd_devnull(1, 1, 1) == -1)
1.266 djm 2166: error_f("stdfd_devnull failed");
1.21 markus 2167:
1.41 markus 2168: /* deny core dumps, since memory contains unencrypted private keys */
2169: rlim.rlim_cur = rlim.rlim_max = 0;
1.237 deraadt 2170: if (setrlimit(RLIMIT_CORE, &rlim) == -1) {
1.81 stevesk 2171: error("setrlimit RLIMIT_CORE: %s", strerror(errno));
1.21 markus 2172: cleanup_exit(1);
2173: }
1.57 markus 2174:
2175: skip:
1.187 djm 2176:
2177: cleanup_pid = getpid();
1.163 markus 2178:
2179: #ifdef ENABLE_PKCS11
2180: pkcs11_init(0);
2181: #endif
1.21 markus 2182: new_socket(AUTH_SOCKET, sock);
1.155 dtucker 2183: if (ac > 0)
2184: parent_alive_interval = 10;
1.33 markus 2185: idtab_init();
1.252 dtucker 2186: ssh_signal(SIGPIPE, SIG_IGN);
2187: ssh_signal(SIGINT, (d_flag | D_flag) ? cleanup_handler : SIG_IGN);
2188: ssh_signal(SIGHUP, cleanup_handler);
2189: ssh_signal(SIGTERM, cleanup_handler);
1.205 djm 2190:
1.215 djm 2191: if (pledge("stdio rpath cpath unix id proc exec", NULL) == -1)
1.205 djm 2192: fatal("%s: pledge: %s", __progname, strerror(errno));
1.66 markus 2193:
1.21 markus 2194: while (1) {
1.231 djm 2195: prepare_poll(&pfd, &npfd, &timeout, maxfds);
1.223 djm 2196: result = poll(pfd, npfd, timeout);
1.154 dtucker 2197: saved_errno = errno;
1.155 dtucker 2198: if (parent_alive_interval != 0)
2199: check_parent_exists();
2200: (void) reaper(); /* remove expired keys */
1.237 deraadt 2201: if (result == -1) {
1.154 dtucker 2202: if (saved_errno == EINTR)
1.21 markus 2203: continue;
1.223 djm 2204: fatal("poll: %s", strerror(saved_errno));
1.154 dtucker 2205: } else if (result > 0)
1.231 djm 2206: after_poll(pfd, npfd, maxfds);
1.15 markus 2207: }
1.21 markus 2208: /* NOTREACHED */
1.1 deraadt 2209: }
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