1 /* $NetBSD: monitor_wrap.c,v 1.36 2025/04/09 15:49:32 christos Exp $ */
2 /* $OpenBSD: monitor_wrap.c,v 1.138 2024/10/22 06:13:00 dtucker Exp $ */
3
4 /*
5 * Copyright 2002 Niels Provos <provos@citi.umich.edu>
6 * Copyright 2002 Markus Friedl <markus@openbsd.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "includes.h"
31 __RCSID("$NetBSD: monitor_wrap.c,v 1.36 2025/04/09 15:49:32 christos Exp $");
32 #include <sys/types.h>
33 #include <sys/uio.h>
34 #include <sys/queue.h>
35 #include <sys/wait.h>
36
37 #include <errno.h>
38 #include <pwd.h>
39 #include <signal.h>
40 #include <stdio.h>
41 #include <string.h>
42 #include <stdarg.h>
43 #include <unistd.h>
44
45 #ifdef WITH_OPENSSL
46 #include <openssl/bn.h>
47 #include <openssl/dh.h>
48 #endif
49
50 #include "xmalloc.h"
51 #include "ssh.h"
52 #ifdef WITH_OPENSSL
53 #include "dh.h"
54 #endif
55 #include "sshbuf.h"
56 #include "sshkey.h"
57 #include "cipher.h"
58 #include "kex.h"
59 #include "hostfile.h"
60 #include "auth.h"
61 #include "auth-options.h"
62 #include "packet.h"
63 #include "mac.h"
64 #include "log.h"
65 #include "monitor.h"
66 #ifdef GSSAPI
67 #include "ssh-gss.h"
68 #endif
69 #include "atomicio.h"
70 #include "monitor_fdpass.h"
71 #ifdef USE_PAM
72 #include "misc.h"
73 #include "servconf.h"
74 #include <security/pam_appl.h>
75 #endif
76 #include "misc.h"
77
78 #include "channels.h"
79 #include "session.h"
80 #include "servconf.h"
81 #include "monitor_wrap.h"
82 #include "srclimit.h"
83
84 #include "ssherr.h"
85
86 /* Imports */
87 extern struct monitor *pmonitor;
88 extern struct sshbuf *loginmsg;
89 extern ServerOptions options;
90
91 void
mm_log_handler(LogLevel level,int forced,const char * msg,void * ctx)92 mm_log_handler(LogLevel level, int forced, const char *msg, void *ctx)
93 {
94 struct sshbuf *log_msg;
95 struct monitor *mon = (struct monitor *)ctx;
96 int r;
97 size_t len;
98
99 if (mon->m_log_sendfd == -1)
100 fatal_f("no log channel");
101
102 if ((log_msg = sshbuf_new()) == NULL)
103 fatal_f("sshbuf_new failed");
104
105 if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
106 (r = sshbuf_put_u32(log_msg, level)) != 0 ||
107 (r = sshbuf_put_u32(log_msg, forced)) != 0 ||
108 (r = sshbuf_put_cstring(log_msg, msg)) != 0)
109 fatal_fr(r, "assemble");
110 if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
111 fatal_f("bad length %zu", len);
112 POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
113 if (atomicio(vwrite, mon->m_log_sendfd,
114 sshbuf_mutable_ptr(log_msg), len) != len)
115 fatal_f("write: %s", strerror(errno));
116 sshbuf_free(log_msg);
117 }
118
119 static void
mm_reap(void)120 mm_reap(void)
121 {
122 int status = -1;
123
124 if (!mm_is_monitor())
125 return;
126 while (waitpid(pmonitor->m_pid, &status, 0) == -1) {
127 if (errno == EINTR)
128 continue;
129 pmonitor->m_pid = -1;
130 fatal_f("waitpid: %s", strerror(errno));
131 }
132 if (WIFEXITED(status)) {
133 if (WEXITSTATUS(status) != 0) {
134 debug_f("preauth child exited with status %d",
135 WEXITSTATUS(status));
136 cleanup_exit(255);
137 }
138 } else if (WIFSIGNALED(status)) {
139 error_f("preauth child terminated by signal %d",
140 WTERMSIG(status));
141 cleanup_exit(signal_is_crash(WTERMSIG(status)) ?
142 EXIT_CHILD_CRASH : 255);
143 } else {
144 error_f("preauth child terminated abnormally (status=0x%x)",
145 status);
146 cleanup_exit(EXIT_CHILD_CRASH);
147 }
148 }
149
150 void
mm_request_send(int sock,enum monitor_reqtype type,struct sshbuf * m)151 mm_request_send(int sock, enum monitor_reqtype type, struct sshbuf *m)
152 {
153 size_t mlen = sshbuf_len(m);
154 u_char buf[5];
155
156 debug3_f("entering, type %d", type);
157
158 if (mlen >= 0xffffffff)
159 fatal_f("bad length %zu", mlen);
160 POKE_U32(buf, mlen + 1);
161 buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
162 if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf) ||
163 atomicio(vwrite, sock, sshbuf_mutable_ptr(m), mlen) != mlen) {
164 if (errno == EPIPE) {
165 debug3_f("monitor fd closed");
166 mm_reap();
167 cleanup_exit(255);
168 }
169 fatal_f("write: %s", strerror(errno));
170 }
171 }
172
173 void
mm_request_receive(int sock,struct sshbuf * m)174 mm_request_receive(int sock, struct sshbuf *m)
175 {
176 u_char buf[4], *p = NULL;
177 u_int msg_len;
178 int oerrno, r;
179
180 debug3_f("entering");
181
182 if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
183 if (errno == EPIPE) {
184 debug3_f("monitor fd closed");
185 mm_reap();
186 cleanup_exit(255);
187 }
188 fatal_f("read: %s", strerror(errno));
189 }
190 msg_len = PEEK_U32(buf);
191 if (msg_len > 256 * 1024)
192 fatal_f("read: bad msg_len %d", msg_len);
193 sshbuf_reset(m);
194 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0)
195 fatal_fr(r, "reserve");
196 if (atomicio(read, sock, p, msg_len) != msg_len) {
197 oerrno = errno;
198 error_f("read: %s", strerror(errno));
199 if (oerrno == EPIPE)
200 mm_reap();
201 cleanup_exit(255);
202 }
203 }
204
205 void
mm_request_receive_expect(int sock,enum monitor_reqtype type,struct sshbuf * m)206 mm_request_receive_expect(int sock, enum monitor_reqtype type, struct sshbuf *m)
207 {
208 u_char rtype;
209 int r;
210
211 debug3_f("entering, type %d", type);
212
213 mm_request_receive(sock, m);
214 if ((r = sshbuf_get_u8(m, &rtype)) != 0)
215 fatal_fr(r, "parse");
216 if (rtype != type)
217 fatal_f("read: rtype %d != type %d", rtype, type);
218 }
219
220 #ifdef WITH_OPENSSL
221 DH *
mm_choose_dh(int min,int nbits,int max)222 mm_choose_dh(int min, int nbits, int max)
223 {
224 BIGNUM *p, *g;
225 int r;
226 u_char success = 0;
227 struct sshbuf *m;
228
229 if ((m = sshbuf_new()) == NULL)
230 fatal_f("sshbuf_new failed");
231 if ((r = sshbuf_put_u32(m, min)) != 0 ||
232 (r = sshbuf_put_u32(m, nbits)) != 0 ||
233 (r = sshbuf_put_u32(m, max)) != 0)
234 fatal_fr(r, "assemble");
235
236 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, m);
237
238 debug3_f("waiting for MONITOR_ANS_MODULI");
239 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, m);
240
241 if ((r = sshbuf_get_u8(m, &success)) != 0)
242 fatal_fr(r, "parse success");
243 if (success == 0)
244 fatal_f("MONITOR_ANS_MODULI failed");
245
246 if ((r = sshbuf_get_bignum2(m, &p)) != 0 ||
247 (r = sshbuf_get_bignum2(m, &g)) != 0)
248 fatal_fr(r, "parse group");
249
250 debug3_f("remaining %zu", sshbuf_len(m));
251 sshbuf_free(m);
252
253 return (dh_new_group(g, p));
254 }
255 #endif
256
257 int
mm_sshkey_sign(struct ssh * ssh,struct sshkey * key,u_char ** sigp,size_t * lenp,const u_char * data,size_t datalen,const char * hostkey_alg,const char * sk_provider,const char * sk_pin,u_int compat)258 mm_sshkey_sign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
259 const u_char *data, size_t datalen, const char *hostkey_alg,
260 const char *sk_provider, const char *sk_pin, u_int compat)
261 {
262 struct sshbuf *m;
263 int r;
264
265 debug3_f("entering");
266 if ((m = sshbuf_new()) == NULL)
267 fatal_f("sshbuf_new failed");
268 if ((r = sshkey_puts(key, m)) != 0 ||
269 (r = sshbuf_put_string(m, data, datalen)) != 0 ||
270 (r = sshbuf_put_cstring(m, hostkey_alg)) != 0 ||
271 (r = sshbuf_put_u32(m, compat)) != 0)
272 fatal_fr(r, "assemble");
273
274 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, m);
275
276 debug3_f("waiting for MONITOR_ANS_SIGN");
277 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, m);
278 if ((r = sshbuf_get_string(m, sigp, lenp)) != 0)
279 fatal_fr(r, "parse");
280 sshbuf_free(m);
281 debug3_f("%s signature len=%zu", hostkey_alg ? hostkey_alg : "(null)",
282 *lenp);
283
284 return (0);
285 }
286
287 void
mm_decode_activate_server_options(struct ssh * ssh,struct sshbuf * m)288 mm_decode_activate_server_options(struct ssh *ssh, struct sshbuf *m)
289 {
290 const u_char *p;
291 size_t len;
292 u_int i;
293 ServerOptions *newopts;
294 int r;
295
296 if ((r = sshbuf_get_string_direct(m, &p, &len)) != 0)
297 fatal_fr(r, "parse opts");
298 if (len != sizeof(*newopts))
299 fatal_f("option block size mismatch");
300 newopts = xcalloc(sizeof(*newopts), 1);
301 memcpy(newopts, p, sizeof(*newopts));
302
303 #define M_CP_STROPT(x) do { \
304 if (newopts->x != NULL && \
305 (r = sshbuf_get_cstring(m, &newopts->x, NULL)) != 0) \
306 fatal_fr(r, "parse %s", #x); \
307 } while (0)
308 #define M_CP_STRARRAYOPT(x, nx) do { \
309 newopts->x = newopts->nx == 0 ? \
310 NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
311 for (i = 0; i < newopts->nx; i++) { \
312 if ((r = sshbuf_get_cstring(m, \
313 &newopts->x[i], NULL)) != 0) \
314 fatal_fr(r, "parse %s", #x); \
315 } \
316 } while (0)
317 /* See comment in servconf.h */
318 COPY_MATCH_STRING_OPTS();
319 #undef M_CP_STROPT
320 #undef M_CP_STRARRAYOPT
321
322 copy_set_server_options(&options, newopts, 1);
323 log_change_level(options.log_level);
324 log_verbose_reset();
325 for (i = 0; i < options.num_log_verbose; i++)
326 log_verbose_add(options.log_verbose[i]);
327 free(newopts);
328 }
329
330 #define GETPW(b, id) \
331 do { \
332 if ((r = sshbuf_get_string_direct(b, &p, &len)) != 0) \
333 fatal_fr(r, "parse pw %s", #id); \
334 if (len != sizeof(pw->id)) \
335 fatal_fr(r, "bad length for %s", #id); \
336 memcpy(&pw->id, p, len); \
337 } while (0)
338
339 struct passwd *
mm_getpwnamallow(struct ssh * ssh,const char * username)340 mm_getpwnamallow(struct ssh *ssh, const char *username)
341 {
342 struct sshbuf *m;
343 struct passwd *pw;
344 size_t len;
345 int r;
346 u_char ok;
347 const u_char *p;
348
349 debug3_f("entering");
350
351 if ((m = sshbuf_new()) == NULL)
352 fatal_f("sshbuf_new failed");
353 if ((r = sshbuf_put_cstring(m, username)) != 0)
354 fatal_fr(r, "assemble");
355
356 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, m);
357
358 debug3_f("waiting for MONITOR_ANS_PWNAM");
359 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, m);
360
361 if ((r = sshbuf_get_u8(m, &ok)) != 0)
362 fatal_fr(r, "parse success");
363 if (ok == 0) {
364 pw = NULL;
365 goto out;
366 }
367
368 pw = xcalloc(sizeof(*pw), 1);
369 GETPW(m, pw_uid);
370 GETPW(m, pw_gid);
371 GETPW(m, pw_change);
372 GETPW(m, pw_expire);
373 if ((r = sshbuf_get_cstring(m, &pw->pw_name, NULL)) != 0 ||
374 (r = sshbuf_get_cstring(m, &pw->pw_passwd, NULL)) != 0 ||
375 (r = sshbuf_get_cstring(m, &pw->pw_gecos, NULL)) != 0 ||
376 (r = sshbuf_get_cstring(m, &pw->pw_class, NULL)) != 0 ||
377 (r = sshbuf_get_cstring(m, &pw->pw_dir, NULL)) != 0 ||
378 (r = sshbuf_get_cstring(m, &pw->pw_shell, NULL)) != 0)
379 fatal_fr(r, "parse pw");
380
381 out:
382 /* copy options block as a Match directive may have changed some */
383 mm_decode_activate_server_options(ssh, m);
384 server_process_permitopen(ssh);
385 server_process_channel_timeouts(ssh);
386 kex_set_server_sig_algs(ssh, options.pubkey_accepted_algos);
387 sshbuf_free(m);
388
389 return (pw);
390 }
391
392 char *
mm_auth2_read_banner(void)393 mm_auth2_read_banner(void)
394 {
395 struct sshbuf *m;
396 char *banner;
397 int r;
398
399 debug3_f("entering");
400
401 if ((m = sshbuf_new()) == NULL)
402 fatal_f("sshbuf_new failed");
403 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, m);
404 sshbuf_reset(m);
405
406 mm_request_receive_expect(pmonitor->m_recvfd,
407 MONITOR_ANS_AUTH2_READ_BANNER, m);
408 if ((r = sshbuf_get_cstring(m, &banner, NULL)) != 0)
409 fatal_fr(r, "parse");
410 sshbuf_free(m);
411
412 /* treat empty banner as missing banner */
413 if (strlen(banner) == 0) {
414 free(banner);
415 banner = NULL;
416 }
417 return (banner);
418 }
419
420 /* Inform the privileged process about service and style */
421
422 void
mm_inform_authserv(char * service,char * style)423 mm_inform_authserv(char *service, char *style)
424 {
425 struct sshbuf *m;
426 int r;
427
428 debug3_f("entering");
429
430 if ((m = sshbuf_new()) == NULL)
431 fatal_f("sshbuf_new failed");
432 if ((r = sshbuf_put_cstring(m, service)) != 0 ||
433 (r = sshbuf_put_cstring(m, style ? style : "")) != 0)
434 fatal_fr(r, "assemble");
435
436 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, m);
437
438 sshbuf_free(m);
439 }
440
441 /* Do the password authentication */
442 int
mm_auth_password(struct ssh * ssh,const char * password)443 mm_auth_password(struct ssh *ssh, const char *password)
444 {
445 struct sshbuf *m;
446 int r;
447 u_int authenticated = 0;
448 #ifdef USE_PAM
449 u_int maxtries = 0;
450 #endif
451
452 debug3_f("entering");
453
454 if ((m = sshbuf_new()) == NULL)
455 fatal_f("sshbuf_new failed");
456 if ((r = sshbuf_put_cstring(m, password)) != 0)
457 fatal_fr(r, "assemble");
458 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, m);
459
460 debug3_f("waiting for MONITOR_ANS_AUTHPASSWORD");
461 mm_request_receive_expect(pmonitor->m_recvfd,
462 MONITOR_ANS_AUTHPASSWORD, m);
463
464 if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
465 fatal_fr(r, "parse");
466
467 #ifdef USE_PAM
468 if ((r = sshbuf_get_u32(m, &maxtries)) != 0)
469 fatal_fr(r, "parse PAM");
470 if (maxtries > INT_MAX)
471 fatal_fr(r, "bad maxtries");
472 sshpam_set_maxtries_reached(maxtries);
473 #endif
474
475 sshbuf_free(m);
476
477 debug3_f("user %sauthenticated", authenticated ? "" : "not ");
478 return (authenticated);
479 }
480
481 int
mm_user_key_allowed(struct ssh * ssh,struct passwd * pw,struct sshkey * key,int pubkey_auth_attempt,struct sshauthopt ** authoptp)482 mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
483 int pubkey_auth_attempt, struct sshauthopt **authoptp)
484 {
485 return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
486 pubkey_auth_attempt, authoptp));
487 }
488
489 int
mm_hostbased_key_allowed(struct ssh * ssh,struct passwd * pw,const char * user,const char * host,struct sshkey * key)490 mm_hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
491 const char *user, const char *host, struct sshkey *key)
492 {
493 return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
494 }
495
496 int
mm_key_allowed(enum mm_keytype type,const char * user,const char * host,struct sshkey * key,int pubkey_auth_attempt,struct sshauthopt ** authoptp)497 mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
498 struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
499 {
500 struct sshbuf *m;
501 int r;
502 u_int allowed = 0;
503 struct sshauthopt *opts = NULL;
504
505 debug3_f("entering");
506
507 if (authoptp != NULL)
508 *authoptp = NULL;
509
510 if ((m = sshbuf_new()) == NULL)
511 fatal_f("sshbuf_new failed");
512 if ((r = sshbuf_put_u32(m, type)) != 0 ||
513 (r = sshbuf_put_cstring(m, user ? user : "")) != 0 ||
514 (r = sshbuf_put_cstring(m, host ? host : "")) != 0 ||
515 (r = sshkey_puts(key, m)) != 0 ||
516 (r = sshbuf_put_u32(m, pubkey_auth_attempt)) != 0)
517 fatal_fr(r, "assemble");
518
519 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, m);
520
521 debug3_f("waiting for MONITOR_ANS_KEYALLOWED");
522 mm_request_receive_expect(pmonitor->m_recvfd,
523 MONITOR_ANS_KEYALLOWED, m);
524
525 if ((r = sshbuf_get_u32(m, &allowed)) != 0)
526 fatal_fr(r, "parse");
527 if (allowed && type == MM_USERKEY &&
528 (r = sshauthopt_deserialise(m, &opts)) != 0)
529 fatal_fr(r, "sshauthopt_deserialise");
530 sshbuf_free(m);
531
532 if (authoptp != NULL) {
533 *authoptp = opts;
534 opts = NULL;
535 }
536 sshauthopt_free(opts);
537
538 return allowed;
539 }
540
541 /*
542 * This key verify needs to send the key type along, because the
543 * privileged parent makes the decision if the key is allowed
544 * for authentication.
545 */
546
547 int
mm_sshkey_verify(const struct sshkey * key,const u_char * sig,size_t siglen,const u_char * data,size_t datalen,const char * sigalg,u_int compat,struct sshkey_sig_details ** sig_detailsp)548 mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
549 const u_char *data, size_t datalen, const char *sigalg, u_int compat,
550 struct sshkey_sig_details **sig_detailsp)
551 {
552 struct sshbuf *m;
553 u_int encoded_ret = 0;
554 int r;
555 u_char sig_details_present, flags;
556 u_int counter;
557
558 debug3_f("entering");
559
560 if (sig_detailsp != NULL)
561 *sig_detailsp = NULL;
562 if ((m = sshbuf_new()) == NULL)
563 fatal_f("sshbuf_new failed");
564 if ((r = sshkey_puts(key, m)) != 0 ||
565 (r = sshbuf_put_string(m, sig, siglen)) != 0 ||
566 (r = sshbuf_put_string(m, data, datalen)) != 0 ||
567 (r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
568 fatal_fr(r, "assemble");
569
570 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, m);
571
572 debug3_f("waiting for MONITOR_ANS_KEYVERIFY");
573 mm_request_receive_expect(pmonitor->m_recvfd,
574 MONITOR_ANS_KEYVERIFY, m);
575
576 if ((r = sshbuf_get_u32(m, &encoded_ret)) != 0 ||
577 (r = sshbuf_get_u8(m, &sig_details_present)) != 0)
578 fatal_fr(r, "parse");
579 if (sig_details_present && encoded_ret == 0) {
580 if ((r = sshbuf_get_u32(m, &counter)) != 0 ||
581 (r = sshbuf_get_u8(m, &flags)) != 0)
582 fatal_fr(r, "parse sig_details");
583 if (sig_detailsp != NULL) {
584 *sig_detailsp = xcalloc(1, sizeof(**sig_detailsp));
585 (*sig_detailsp)->sk_counter = counter;
586 (*sig_detailsp)->sk_flags = flags;
587 }
588 }
589
590 sshbuf_free(m);
591
592 if (encoded_ret != 0)
593 return SSH_ERR_SIGNATURE_INVALID;
594 return 0;
595 }
596
597 void
mm_send_keystate(struct ssh * ssh,struct monitor * monitor)598 mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
599 {
600 struct sshbuf *m;
601 int r;
602
603 if ((m = sshbuf_new()) == NULL)
604 fatal_f("sshbuf_new failed");
605 if ((r = ssh_packet_get_state(ssh, m)) != 0)
606 fatal_fr(r, "ssh_packet_get_state");
607 mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
608 debug3_f("Finished sending state");
609 sshbuf_free(m);
610 }
611
612 int
mm_pty_allocate(int * ptyfd,int * ttyfd,char * namebuf,size_t namebuflen)613 mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
614 {
615 struct sshbuf *m;
616 char *p, *msg;
617 u_int success = 0;
618 int tmp1 = -1, tmp2 = -1, r;
619
620 /* Kludge: ensure there are fds free to receive the pty/tty */
621 if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
622 (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
623 error_f("cannot allocate fds for pty");
624 if (tmp1 >= 0)
625 close(tmp1);
626 return 0;
627 }
628 close(tmp1);
629 close(tmp2);
630
631 if ((m = sshbuf_new()) == NULL)
632 fatal_f("sshbuf_new failed");
633 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, m);
634
635 debug3_f("waiting for MONITOR_ANS_PTY");
636 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, m);
637
638 if ((r = sshbuf_get_u32(m, &success)) != 0)
639 fatal_fr(r, "parse success");
640 if (success == 0) {
641 debug3_f("pty alloc failed");
642 sshbuf_free(m);
643 return (0);
644 }
645 if ((r = sshbuf_get_cstring(m, &p, NULL)) != 0 ||
646 (r = sshbuf_get_cstring(m, &msg, NULL)) != 0)
647 fatal_fr(r, "parse");
648 sshbuf_free(m);
649
650 strlcpy(namebuf, p, namebuflen); /* Possible truncation */
651 free(p);
652
653 if ((r = sshbuf_put(loginmsg, msg, strlen(msg))) != 0)
654 fatal_fr(r, "put loginmsg");
655 free(msg);
656
657 if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
658 (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
659 fatal_f("receive fds failed");
660
661 /* Success */
662 return (1);
663 }
664
665 void
mm_session_pty_cleanup2(Session * s)666 mm_session_pty_cleanup2(Session *s)
667 {
668 struct sshbuf *m;
669 int r;
670
671 if (s->ttyfd == -1)
672 return;
673 if ((m = sshbuf_new()) == NULL)
674 fatal_f("sshbuf_new failed");
675 if ((r = sshbuf_put_cstring(m, s->tty)) != 0)
676 fatal_fr(r, "assmble");
677 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, m);
678 sshbuf_free(m);
679
680 /* closed dup'ed master */
681 if (s->ptymaster != -1 && close(s->ptymaster) == -1)
682 error("close(s->ptymaster/%d): %s",
683 s->ptymaster, strerror(errno));
684
685 /* unlink pty from session */
686 s->ttyfd = -1;
687 }
688
689 #ifdef USE_PAM
690 void
mm_start_pam(struct ssh * ssh)691 mm_start_pam(struct ssh *ssh)
692 {
693 struct sshbuf *m;
694
695 debug3("%s entering", __func__);
696 if (!options.use_pam)
697 fatal("UsePAM=no, but ended up in %s anyway", __func__);
698
699 if ((m = sshbuf_new()) == NULL)
700 fatal("%s: sshbuf_new failed", __func__);
701 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, m);
702
703 sshbuf_free(m);
704 }
705
706 u_int
mm_do_pam_account(void)707 mm_do_pam_account(void)
708 {
709 struct sshbuf *m;
710 u_int ret;
711 size_t msglen;
712 char *msg;
713 int r;
714
715 debug3("%s entering", __func__);
716 if (!options.use_pam)
717 fatal("UsePAM=no, but ended up in %s anyway", __func__);
718
719 if ((m = sshbuf_new()) == NULL)
720 fatal("%s: sshbuf_new failed", __func__);
721 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, m);
722
723 mm_request_receive_expect(pmonitor->m_recvfd,
724 MONITOR_ANS_PAM_ACCOUNT, m);
725 if ((r = sshbuf_get_u32(m, &ret)) != 0 ||
726 (r = sshbuf_get_cstring(m, &msg, &msglen)) != 0 ||
727 (r = sshbuf_put(loginmsg, msg, msglen)) != 0)
728 fatal("%s: buffer error: %s", __func__, ssh_err(r));
729
730 free(msg);
731 sshbuf_free(m);
732
733 debug3("%s returning %d", __func__, ret);
734
735 return (ret);
736 }
737
738 void *
mm_sshpam_init_ctx(Authctxt * authctxt)739 mm_sshpam_init_ctx(Authctxt *authctxt)
740 {
741 struct sshbuf *m;
742 u_int success;
743 int r;
744
745 debug3("%s", __func__);
746 if ((m = sshbuf_new()) == NULL)
747 fatal("%s: sshbuf_new failed", __func__);
748 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, m);
749 debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
750 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, m);
751 if ((r = sshbuf_get_u32(m, &success)) != 0)
752 fatal("%s: buffer error: %s", __func__, ssh_err(r));
753 if (success == 0) {
754 debug3("%s: pam_init_ctx failed", __func__);
755 sshbuf_free(m);
756 return (NULL);
757 }
758 sshbuf_free(m);
759 return (authctxt);
760 }
761
762 int
mm_sshpam_query(void * ctx,char ** name,char ** info,u_int * num,char *** prompts,u_int ** echo_on)763 mm_sshpam_query(void *ctx, char **name, char **info,
764 u_int *num, char ***prompts, u_int **echo_on)
765 {
766 struct sshbuf *m;
767 u_int i, n, ret;
768 int r;
769
770 debug3("%s", __func__);
771 if ((m = sshbuf_new()) == NULL)
772 fatal("%s: sshbuf_new failed", __func__);
773 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, m);
774 debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
775 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, m);
776 if ((r = sshbuf_get_u32(m, &ret)) != 0 ||
777 (r = sshbuf_get_cstring(m, name, NULL)) != 0 ||
778 (r = sshbuf_get_cstring(m, info, NULL)) != 0 ||
779 (r = sshbuf_get_u32(m, &n)) != 0 ||
780 (r = sshbuf_get_u32(m, num)) != 0)
781 fatal("%s: buffer error: %s", __func__, ssh_err(r));
782 debug3("%s: pam_query returned %d", __func__, ret);
783 sshpam_set_maxtries_reached(n);
784 if (*num > PAM_MAX_NUM_MSG)
785 fatal("%s: received %u PAM messages, expected <= %u",
786 __func__, *num, PAM_MAX_NUM_MSG);
787 *prompts = xcalloc((*num + 1), sizeof(char *));
788 *echo_on = xcalloc((*num + 1), sizeof(u_int));
789 for (i = 0; i < *num; ++i) {
790 if ((r = sshbuf_get_cstring(m, &((*prompts)[i]), NULL)) != 0 ||
791 (r = sshbuf_get_u32(m, &((*echo_on)[i]))) != 0)
792 fatal("%s: buffer error: %s", __func__, ssh_err(r));
793 }
794 sshbuf_free(m);
795 return (ret);
796 }
797
798 int
mm_sshpam_respond(void * ctx,u_int num,char ** resp)799 mm_sshpam_respond(void *ctx, u_int num, char **resp)
800 {
801 struct sshbuf *m;
802 u_int n, i;
803 int r, ret;
804
805 debug3("%s", __func__);
806 if ((m = sshbuf_new()) == NULL)
807 fatal("%s: sshbuf_new failed", __func__);
808 if ((r = sshbuf_put_u32(m, num)) != 0)
809 fatal("%s: buffer error: %s", __func__, ssh_err(r));
810 for (i = 0; i < num; ++i) {
811 if ((r = sshbuf_put_cstring(m, resp[i])) != 0)
812 fatal("%s: buffer error: %s", __func__, ssh_err(r));
813 }
814 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, m);
815 debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
816 mm_request_receive_expect(pmonitor->m_recvfd,
817 MONITOR_ANS_PAM_RESPOND, m);
818 if ((r = sshbuf_get_u32(m, &n)) != 0)
819 fatal("%s: buffer error: %s", __func__, ssh_err(r));
820 ret = (int)n; /* XXX */
821 debug3("%s: pam_respond returned %d", __func__, ret);
822 sshbuf_free(m);
823 return (ret);
824 }
825
826 void
mm_sshpam_free_ctx(void * ctxtp)827 mm_sshpam_free_ctx(void *ctxtp)
828 {
829 struct sshbuf *m;
830
831 debug3("%s", __func__);
832 if ((m = sshbuf_new()) == NULL)
833 fatal("%s: sshbuf_new failed", __func__);
834 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, m);
835 debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
836 mm_request_receive_expect(pmonitor->m_recvfd,
837 MONITOR_ANS_PAM_FREE_CTX, m);
838 sshbuf_free(m);
839 }
840 #endif /* USE_PAM */
841
842 /* Request process termination */
843
844 void
mm_terminate(void)845 mm_terminate(void)
846 {
847 struct sshbuf *m;
848
849 if ((m = sshbuf_new()) == NULL)
850 fatal_f("sshbuf_new failed");
851 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, m);
852 sshbuf_free(m);
853 }
854
855 /* Request state information */
856
857 void
mm_get_state(struct ssh * ssh,struct include_list * includes,struct sshbuf * conf,struct sshbuf ** confdatap,uint64_t * timing_secretp,struct sshbuf ** hostkeysp,struct sshbuf ** keystatep,u_char ** pw_namep,struct sshbuf ** authinfop,struct sshbuf ** auth_optsp)858 mm_get_state(struct ssh *ssh, struct include_list *includes,
859 struct sshbuf *conf, struct sshbuf **confdatap,
860 uint64_t *timing_secretp,
861 struct sshbuf **hostkeysp, struct sshbuf **keystatep,
862 u_char **pw_namep,
863 struct sshbuf **authinfop, struct sshbuf **auth_optsp)
864 {
865 struct sshbuf *m, *inc;
866 u_char *cp;
867 size_t len;
868 int r;
869 struct include_item *item;
870
871 debug3_f("entering");
872
873 if ((m = sshbuf_new()) == NULL || (inc = sshbuf_new()) == NULL)
874 fatal_f("sshbuf_new failed");
875
876 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_STATE, m);
877
878 debug3_f("waiting for MONITOR_ANS_STATE");
879 mm_request_receive_expect(pmonitor->m_recvfd,
880 MONITOR_ANS_STATE, m);
881
882 if ((r = sshbuf_get_string(m, &cp, &len)) != 0 ||
883 (r = sshbuf_get_u64(m, timing_secretp)) != 0 ||
884 (r = sshbuf_froms(m, hostkeysp)) != 0 ||
885 (r = sshbuf_get_stringb(m, ssh->kex->server_version)) != 0 ||
886 (r = sshbuf_get_stringb(m, ssh->kex->client_version)) != 0 ||
887 (r = sshbuf_get_stringb(m, inc)) != 0)
888 fatal_fr(r, "parse config");
889
890 /* postauth */
891 if (confdatap) {
892 if ((r = sshbuf_froms(m, confdatap)) != 0 ||
893 (r = sshbuf_froms(m, keystatep)) != 0 ||
894 (r = sshbuf_get_string(m, pw_namep, NULL)) != 0 ||
895 (r = sshbuf_froms(m, authinfop)) != 0 ||
896 (r = sshbuf_froms(m, auth_optsp)) != 0)
897 fatal_fr(r, "parse config postauth");
898 }
899
900 if (conf != NULL && (r = sshbuf_put(conf, cp, len)))
901 fatal_fr(r, "sshbuf_put");
902
903 while (sshbuf_len(inc) != 0) {
904 item = xcalloc(1, sizeof(*item));
905 if ((item->contents = sshbuf_new()) == NULL)
906 fatal_f("sshbuf_new failed");
907 if ((r = sshbuf_get_cstring(inc, &item->selector, NULL)) != 0 ||
908 (r = sshbuf_get_cstring(inc, &item->filename, NULL)) != 0 ||
909 (r = sshbuf_get_stringb(inc, item->contents)) != 0)
910 fatal_fr(r, "parse includes");
911 TAILQ_INSERT_TAIL(includes, item, entry);
912 }
913
914 free(cp);
915 sshbuf_free(m);
916 sshbuf_free(inc);
917
918 debug3_f("done");
919 }
920
921 #if defined(BSD_AUTH) || defined(SKEY)
922
923 static void
mm_chall_setup(char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)924 mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
925 char ***prompts, u_int **echo_on)
926 {
927 *name = xstrdup("");
928 *infotxt = xstrdup("");
929 *numprompts = 1;
930 *prompts = xcalloc(*numprompts, sizeof(char *));
931 *echo_on = xcalloc(*numprompts, sizeof(u_int));
932 (*echo_on)[0] = 0;
933 }
934
935 #ifdef BSD_AUTH
936 int
mm_bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)937 mm_bsdauth_query(void *ctx, char **name, char **infotxt,
938 u_int *numprompts, char ***prompts, u_int **echo_on)
939 {
940 struct sshbuf *m;
941 u_int success;
942 char *challenge;
943 int r;
944
945 debug3_f("entering");
946
947 if ((m = sshbuf_new()) == NULL)
948 fatal_f("sshbuf_new failed");
949 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, m);
950
951 mm_request_receive_expect(pmonitor->m_recvfd,
952 MONITOR_ANS_BSDAUTHQUERY, m);
953 if ((r = sshbuf_get_u32(m, &success)) != 0)
954 fatal_fr(r, "parse success");
955 if (success == 0) {
956 debug3_f("no challenge");
957 sshbuf_free(m);
958 return (-1);
959 }
960
961 /* Get the challenge, and format the response */
962 if ((r = sshbuf_get_cstring(m, &challenge, NULL)) != 0)
963 fatal_fr(r, "parse challenge");
964 sshbuf_free(m);
965
966 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
967 (*prompts)[0] = challenge;
968
969 debug3_f("received challenge: %s", challenge);
970
971 return (0);
972 }
973
974 int
mm_bsdauth_respond(void * ctx,u_int numresponses,char ** responses)975 mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
976 {
977 struct sshbuf *m;
978 int r, authok;
979
980 debug3_f("entering");
981 if (numresponses != 1)
982 return (-1);
983
984 if ((m = sshbuf_new()) == NULL)
985 fatal_f("sshbuf_new failed");
986 if ((r = sshbuf_put_cstring(m, responses[0])) != 0)
987 fatal_fr(r, "assemble");
988 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, m);
989
990 mm_request_receive_expect(pmonitor->m_recvfd,
991 MONITOR_ANS_BSDAUTHRESPOND, m);
992
993 if ((r = sshbuf_get_u32(m, &authok)) != 0)
994 fatal_fr(r, "parse");
995 sshbuf_free(m);
996
997 return ((authok == 0) ? -1 : 0);
998 }
999 #endif
1000
1001 #ifdef SKEY
1002 int
mm_skey_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)1003 mm_skey_query(void *ctx, char **name, char **infotxt,
1004 u_int *numprompts, char ***prompts, u_int **echo_on)
1005 {
1006 struct sshbuf m;
1007 u_int success;
1008 char *challenge;
1009
1010 debug3("%s: entering", __func__);
1011
1012 sshbuf_new(&m);
1013 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
1014
1015 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
1016 &m);
1017 success = sshbuf_get_int(&m);
1018 if (success == 0) {
1019 debug3("%s: no challenge", __func__);
1020 sshbuf_free(&m);
1021 return (-1);
1022 }
1023
1024 /* Get the challenge, and format the response */
1025 challenge = sshbuf_get_string(&m, NULL);
1026 sshbuf_free(&m);
1027
1028 debug3("%s: received challenge: %s", __func__, challenge);
1029
1030 mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
1031
1032 xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
1033 free(challenge);
1034
1035 return (0);
1036 }
1037
1038 int
mm_skey_respond(void * ctx,u_int numresponses,char ** responses)1039 mm_skey_respond(void *ctx, u_int numresponses, char **responses)
1040 {
1041 struct sshbuf m;
1042 int authok;
1043
1044 debug3("%s: entering", __func__);
1045 if (numresponses != 1)
1046 return (-1);
1047
1048 sshbuf_new(&m);
1049 sshbuf_put_cstring(&m, responses[0]);
1050 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);
1051
1052 mm_request_receive_expect(pmonitor->m_recvfd,
1053 MONITOR_ANS_SKEYRESPOND, &m);
1054
1055 authok = sshbuf_get_int(&m);
1056 sshbuf_free(&m);
1057
1058 return ((authok == 0) ? -1 : 0);
1059 }
1060 #endif /* SKEY */
1061 #endif /* BSDAUTH || SKEY */
1062
1063 #ifdef GSSAPI
1064 OM_uint32
mm_ssh_gssapi_server_ctx(Gssctxt ** ctx,gss_OID goid)1065 mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1066 {
1067 struct sshbuf *m;
1068 OM_uint32 major;
1069 int r;
1070
1071 /* Client doesn't get to see the context */
1072 *ctx = NULL;
1073
1074 if ((m = sshbuf_new()) == NULL)
1075 fatal_f("sshbuf_new failed");
1076 if ((r = sshbuf_put_string(m, goid->elements, goid->length)) != 0)
1077 fatal_fr(r, "assemble");
1078
1079 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, m);
1080 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, m);
1081
1082 if ((r = sshbuf_get_u32(m, &major)) != 0)
1083 fatal_fr(r, "parse");
1084
1085 sshbuf_free(m);
1086 return (major);
1087 }
1088
1089 OM_uint32
mm_ssh_gssapi_accept_ctx(Gssctxt * ctx,gss_buffer_desc * in,gss_buffer_desc * out,OM_uint32 * flagsp)1090 mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
1091 gss_buffer_desc *out, OM_uint32 *flagsp)
1092 {
1093 struct sshbuf *m;
1094 OM_uint32 major;
1095 u_int flags;
1096 int r;
1097
1098 if ((m = sshbuf_new()) == NULL)
1099 fatal_f("sshbuf_new failed");
1100 if ((r = sshbuf_put_string(m, in->value, in->length)) != 0)
1101 fatal_fr(r, "assemble");
1102
1103 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, m);
1104 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, m);
1105
1106 if ((r = sshbuf_get_u32(m, &major)) != 0 ||
1107 (r = ssh_gssapi_get_buffer_desc(m, out)) != 0)
1108 fatal_fr(r, "parse");
1109 if (flagsp != NULL) {
1110 if ((r = sshbuf_get_u32(m, &flags)) != 0)
1111 fatal_fr(r, "parse flags");
1112 *flagsp = flags;
1113 }
1114
1115 sshbuf_free(m);
1116
1117 return (major);
1118 }
1119
1120 OM_uint32
mm_ssh_gssapi_checkmic(Gssctxt * ctx,gss_buffer_t gssbuf,gss_buffer_t gssmic)1121 mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
1122 {
1123 struct sshbuf *m;
1124 OM_uint32 major;
1125 int r;
1126
1127 if ((m = sshbuf_new()) == NULL)
1128 fatal_f("sshbuf_new failed");
1129 if ((r = sshbuf_put_string(m, gssbuf->value, gssbuf->length)) != 0 ||
1130 (r = sshbuf_put_string(m, gssmic->value, gssmic->length)) != 0)
1131 fatal_fr(r, "assemble");
1132
1133 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, m);
1134 mm_request_receive_expect(pmonitor->m_recvfd,
1135 MONITOR_ANS_GSSCHECKMIC, m);
1136
1137 if ((r = sshbuf_get_u32(m, &major)) != 0)
1138 fatal_fr(r, "parse");
1139 sshbuf_free(m);
1140 return(major);
1141 }
1142
1143 int
mm_ssh_gssapi_userok(char * user)1144 mm_ssh_gssapi_userok(char *user)
1145 {
1146 struct sshbuf *m;
1147 int r;
1148 u_int authenticated = 0;
1149
1150 if ((m = sshbuf_new()) == NULL)
1151 fatal_f("sshbuf_new failed");
1152
1153 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, m);
1154 mm_request_receive_expect(pmonitor->m_recvfd,
1155 MONITOR_ANS_GSSUSEROK, m);
1156
1157 if ((r = sshbuf_get_u32(m, &authenticated)) != 0)
1158 fatal_fr(r, "parse");
1159
1160 sshbuf_free(m);
1161 debug3_f("user %sauthenticated", authenticated ? "" : "not ");
1162 return (authenticated);
1163 }
1164 #endif /* GSSAPI */
1165
1166 #ifdef KRB5
1167 int
mm_auth_krb5(void * ctx,void * argp,char ** userp,void * resp)1168 mm_auth_krb5(void *ctx, void *argp, char **userp, void *resp)
1169 {
1170 krb5_data *tkt, *reply;
1171 struct sshbuf *m;
1172 u_int success;
1173 int r;
1174
1175 debug3("%s entering", __func__);
1176 tkt = (krb5_data *) argp;
1177 reply = (krb5_data *) resp;
1178
1179 if ((m = sshbuf_new()) == NULL)
1180 fatal("%s: sshbuf_new failed", __func__);
1181 sshbuf_put_string(m, tkt->data, tkt->length);
1182
1183 mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KRB5, m);
1184 mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KRB5, m);
1185
1186 if ((r = sshbuf_get_u32(m, &success)) != 0)
1187 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1188 if (success) {
1189 size_t len;
1190 u_char *data;
1191
1192 if ((r = sshbuf_get_cstring(m, userp, NULL)) != 0 ||
1193 (r = sshbuf_get_string(m, &data, &len)) != 0)
1194 fatal("%s: buffer error: %s", __func__, ssh_err(r));
1195 reply->data = data;
1196 reply->length = len;
1197 } else {
1198 memset(reply, 0, sizeof(*reply));
1199 *userp = NULL;
1200 }
1201
1202 sshbuf_free(m);
1203 return (success);
1204 }
1205 #endif
1206
1207 /*
1208 * Inform channels layer of permitopen options for a single forwarding
1209 * direction (local/remote).
1210 */
1211 static void
server_process_permitopen_list(struct ssh * ssh,int listen,char ** opens,u_int num_opens)1212 server_process_permitopen_list(struct ssh *ssh, int listen,
1213 char **opens, u_int num_opens)
1214 {
1215 u_int i;
1216 int port;
1217 char *host, *arg, *oarg;
1218 int where = listen ? FORWARD_REMOTE : FORWARD_LOCAL;
1219 const char *what = listen ? "permitlisten" : "permitopen";
1220
1221 channel_clear_permission(ssh, FORWARD_ADM, where);
1222 if (num_opens == 0)
1223 return; /* permit any */
1224
1225 /* handle keywords: "any" / "none" */
1226 if (num_opens == 1 && strcmp(opens[0], "any") == 0)
1227 return;
1228 if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
1229 channel_disable_admin(ssh, where);
1230 return;
1231 }
1232 /* Otherwise treat it as a list of permitted host:port */
1233 for (i = 0; i < num_opens; i++) {
1234 oarg = arg = xstrdup(opens[i]);
1235 host = hpdelim(&arg);
1236 if (host == NULL)
1237 fatal_f("missing host in %s", what);
1238 host = cleanhostname(host);
1239 if (arg == NULL || ((port = permitopen_port(arg)) < 0))
1240 fatal_f("bad port number in %s", what);
1241 /* Send it to channels layer */
1242 channel_add_permission(ssh, FORWARD_ADM,
1243 where, host, port);
1244 free(oarg);
1245 }
1246 }
1247
1248 /*
1249 * Inform channels layer of permitopen options from configuration.
1250 */
1251 void
server_process_permitopen(struct ssh * ssh)1252 server_process_permitopen(struct ssh *ssh)
1253 {
1254 server_process_permitopen_list(ssh, 0,
1255 options.permitted_opens, options.num_permitted_opens);
1256 server_process_permitopen_list(ssh, 1,
1257 options.permitted_listens, options.num_permitted_listens);
1258 }
1259
1260 void
server_process_channel_timeouts(struct ssh * ssh)1261 server_process_channel_timeouts(struct ssh *ssh)
1262 {
1263 u_int i;
1264 int secs;
1265 char *type;
1266
1267 debug3_f("setting %u timeouts", options.num_channel_timeouts);
1268 channel_clear_timeouts(ssh);
1269 for (i = 0; i < options.num_channel_timeouts; i++) {
1270 if (parse_pattern_interval(options.channel_timeouts[i],
1271 &type, &secs) != 0) {
1272 fatal_f("internal error: bad timeout %s",
1273 options.channel_timeouts[i]);
1274 }
1275 channel_add_timeout(ssh, type, secs);
1276 free(type);
1277 }
1278 }
1279
1280 struct connection_info *
server_get_connection_info(struct ssh * ssh,int populate,int use_dns)1281 server_get_connection_info(struct ssh *ssh, int populate, int use_dns)
1282 {
1283 static struct connection_info ci;
1284
1285 if (ssh == NULL || !populate)
1286 return &ci;
1287 ci.host = use_dns ? ssh_remote_hostname(ssh) : ssh_remote_ipaddr(ssh);
1288 ci.address = ssh_remote_ipaddr(ssh);
1289 ci.laddress = ssh_local_ipaddr(ssh);
1290 ci.lport = ssh_local_port(ssh);
1291 ci.rdomain = ssh_packet_rdomain_in(ssh);
1292 return &ci;
1293 }
1294
1295