Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.100
1.100 ! sf 1: /* $OpenBSD: monitor_wrap.c,v 1.99 2018/03/03 03:15:51 djm Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
1.46 stevesk 28: #include <sys/types.h>
1.51 dtucker 29: #include <sys/uio.h>
1.61 djm 30: #include <sys/queue.h>
1.46 stevesk 31:
1.47 stevesk 32: #include <errno.h>
1.46 stevesk 33: #include <pwd.h>
1.50 deraadt 34: #include <signal.h>
1.49 stevesk 35: #include <stdio.h>
1.48 stevesk 36: #include <string.h>
1.51 dtucker 37: #include <unistd.h>
1.68 dtucker 38:
1.80 markus 39: #ifdef WITH_OPENSSL
1.68 dtucker 40: #include <openssl/bn.h>
41: #include <openssl/dh.h>
1.80 markus 42: #endif
1.1 provos 43:
1.50 deraadt 44: #include "xmalloc.h"
1.1 provos 45: #include "ssh.h"
1.80 markus 46: #ifdef WITH_OPENSSL
1.1 provos 47: #include "dh.h"
1.80 markus 48: #endif
1.50 deraadt 49: #include "buffer.h"
50: #include "key.h"
51: #include "cipher.h"
1.1 provos 52: #include "kex.h"
1.50 deraadt 53: #include "hostfile.h"
1.1 provos 54: #include "auth.h"
1.22 markus 55: #include "auth-options.h"
1.1 provos 56: #include "packet.h"
57: #include "mac.h"
58: #include "log.h"
1.54 miod 59: #include <zlib.h>
1.1 provos 60: #include "monitor.h"
1.50 deraadt 61: #ifdef GSSAPI
62: #include "ssh-gss.h"
63: #endif
1.1 provos 64: #include "monitor_wrap.h"
65: #include "atomicio.h"
66: #include "monitor_fdpass.h"
1.45 djm 67: #include "misc.h"
1.1 provos 68:
69: #include "channels.h"
70: #include "session.h"
1.55 dtucker 71: #include "servconf.h"
1.29 markus 72:
1.82 markus 73: #include "ssherr.h"
74:
1.1 provos 75: /* Imports */
1.7 mouring 76: extern struct monitor *pmonitor;
1.39 dtucker 77: extern Buffer loginmsg;
1.55 dtucker 78: extern ServerOptions options;
1.73 djm 79:
80: void
81: mm_log_handler(LogLevel level, const char *msg, void *ctx)
82: {
83: Buffer log_msg;
84: struct monitor *mon = (struct monitor *)ctx;
85:
86: if (mon->m_log_sendfd == -1)
87: fatal("%s: no log channel", __func__);
88:
89: buffer_init(&log_msg);
90: /*
91: * Placeholder for packet length. Will be filled in with the actual
92: * packet length once the packet has been constucted. This saves
93: * fragile math.
94: */
95: buffer_put_int(&log_msg, 0);
96:
97: buffer_put_int(&log_msg, level);
98: buffer_put_cstring(&log_msg, msg);
99: put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
100: if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
101: buffer_len(&log_msg)) != buffer_len(&log_msg))
102: fatal("%s: write: %s", __func__, strerror(errno));
103: buffer_free(&log_msg);
104: }
1.1 provos 105:
1.32 markus 106: int
107: mm_is_monitor(void)
108: {
109: /*
110: * m_pid is only set in the privileged part, and
111: * points to the unprivileged child.
112: */
1.34 markus 113: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 114: }
115:
1.1 provos 116: void
1.36 avsm 117: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 118: {
1.13 deraadt 119: u_int mlen = buffer_len(m);
1.1 provos 120: u_char buf[5];
121:
1.8 markus 122: debug3("%s entering: type %d", __func__, type);
1.1 provos 123:
1.45 djm 124: put_u32(buf, mlen + 1);
1.10 deraadt 125: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 126: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 127: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 128: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 129: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 130: }
131:
132: void
1.36 avsm 133: mm_request_receive(int sock, Buffer *m)
1.1 provos 134: {
135: u_char buf[4];
1.13 deraadt 136: u_int msg_len;
1.1 provos 137:
1.8 markus 138: debug3("%s entering", __func__);
1.1 provos 139:
1.40 avsm 140: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
141: if (errno == EPIPE)
1.32 markus 142: cleanup_exit(255);
1.40 avsm 143: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 144: }
1.45 djm 145: msg_len = get_u32(buf);
1.1 provos 146: if (msg_len > 256 * 1024)
1.8 markus 147: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 148: buffer_clear(m);
149: buffer_append_space(m, msg_len);
1.40 avsm 150: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
151: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 152: }
153:
154: void
1.36 avsm 155: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 156: {
157: u_char rtype;
158:
1.8 markus 159: debug3("%s entering: type %d", __func__, type);
1.1 provos 160:
1.36 avsm 161: mm_request_receive(sock, m);
1.1 provos 162: rtype = buffer_get_char(m);
163: if (rtype != type)
1.8 markus 164: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 165: rtype, type);
166: }
167:
1.80 markus 168: #ifdef WITH_OPENSSL
1.1 provos 169: DH *
170: mm_choose_dh(int min, int nbits, int max)
171: {
172: BIGNUM *p, *g;
173: int success = 0;
174: Buffer m;
175:
176: buffer_init(&m);
177: buffer_put_int(&m, min);
178: buffer_put_int(&m, nbits);
179: buffer_put_int(&m, max);
180:
1.7 mouring 181: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 182:
1.8 markus 183: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 184: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 185:
186: success = buffer_get_char(&m);
187: if (success == 0)
1.8 markus 188: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 189:
190: if ((p = BN_new()) == NULL)
1.8 markus 191: fatal("%s: BN_new failed", __func__);
1.3 markus 192: if ((g = BN_new()) == NULL)
1.8 markus 193: fatal("%s: BN_new failed", __func__);
1.1 provos 194: buffer_get_bignum2(&m, p);
195: buffer_get_bignum2(&m, g);
196:
1.8 markus 197: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 198: buffer_free(&m);
199:
200: return (dh_new_group(g, p));
201: }
1.80 markus 202: #endif
1.1 provos 203:
204: int
1.91 markus 205: mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp,
1.86 markus 206: const u_char *data, u_int datalen, const char *hostkey_alg)
1.1 provos 207: {
1.83 markus 208: struct kex *kex = *pmonitor->m_pkex;
1.1 provos 209: Buffer m;
210:
1.8 markus 211: debug3("%s entering", __func__);
1.1 provos 212:
213: buffer_init(&m);
1.84 djm 214: buffer_put_int(&m, kex->host_key_index(key, 0, active_state));
1.1 provos 215: buffer_put_string(&m, data, datalen);
1.86 markus 216: buffer_put_cstring(&m, hostkey_alg);
1.1 provos 217:
1.7 mouring 218: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 219:
1.8 markus 220: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 221: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 222: *sigp = buffer_get_string(&m, lenp);
223: buffer_free(&m);
224:
225: return (0);
226: }
227:
228: struct passwd *
1.37 dtucker 229: mm_getpwnamallow(const char *username)
1.1 provos 230: {
1.93 djm 231: struct ssh *ssh = active_state; /* XXX */
1.1 provos 232: Buffer m;
233: struct passwd *pw;
1.72 djm 234: u_int len, i;
1.55 dtucker 235: ServerOptions *newopts;
1.1 provos 236:
1.8 markus 237: debug3("%s entering", __func__);
1.1 provos 238:
239: buffer_init(&m);
1.37 dtucker 240: buffer_put_cstring(&m, username);
1.1 provos 241:
1.7 mouring 242: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 243:
1.8 markus 244: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 245: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 246:
247: if (buffer_get_char(&m) == 0) {
1.60 dtucker 248: pw = NULL;
249: goto out;
1.1 provos 250: }
1.55 dtucker 251: pw = buffer_get_string(&m, &len);
252: if (len != sizeof(struct passwd))
1.8 markus 253: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 254: pw->pw_name = buffer_get_string(&m, NULL);
255: pw->pw_passwd = buffer_get_string(&m, NULL);
256: pw->pw_gecos = buffer_get_string(&m, NULL);
257: pw->pw_class = buffer_get_string(&m, NULL);
258: pw->pw_dir = buffer_get_string(&m, NULL);
259: pw->pw_shell = buffer_get_string(&m, NULL);
1.55 dtucker 260:
1.60 dtucker 261: out:
1.55 dtucker 262: /* copy options block as a Match directive may have changed some */
263: newopts = buffer_get_string(&m, &len);
264: if (len != sizeof(*newopts))
265: fatal("%s: option block size mismatch", __func__);
1.71 djm 266:
267: #define M_CP_STROPT(x) do { \
268: if (newopts->x != NULL) \
269: newopts->x = buffer_get_string(&m, NULL); \
270: } while (0)
1.72 djm 271: #define M_CP_STRARRAYOPT(x, nx) do { \
1.95 djm 272: newopts->x = newopts->nx == 0 ? \
273: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
1.72 djm 274: for (i = 0; i < newopts->nx; i++) \
275: newopts->x[i] = buffer_get_string(&m, NULL); \
276: } while (0)
1.71 djm 277: /* See comment in servconf.h */
278: COPY_MATCH_STRING_OPTS();
279: #undef M_CP_STROPT
1.72 djm 280: #undef M_CP_STRARRAYOPT
1.71 djm 281:
1.55 dtucker 282: copy_set_server_options(&options, newopts, 1);
1.90 djm 283: log_change_level(options.log_level);
1.93 djm 284: process_permitopen(ssh, &options);
1.76 djm 285: free(newopts);
1.55 dtucker 286:
1.1 provos 287: buffer_free(&m);
288:
289: return (pw);
1.6 djm 290: }
291:
1.33 markus 292: char *
293: mm_auth2_read_banner(void)
1.6 djm 294: {
295: Buffer m;
296: char *banner;
297:
1.8 markus 298: debug3("%s entering", __func__);
1.6 djm 299:
300: buffer_init(&m);
1.7 mouring 301: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 302: buffer_clear(&m);
303:
1.33 markus 304: mm_request_receive_expect(pmonitor->m_recvfd,
305: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 306: banner = buffer_get_string(&m, NULL);
307: buffer_free(&m);
1.10 deraadt 308:
1.33 markus 309: /* treat empty banner as missing banner */
310: if (strlen(banner) == 0) {
1.76 djm 311: free(banner);
1.33 markus 312: banner = NULL;
313: }
1.6 djm 314: return (banner);
1.1 provos 315: }
316:
317: /* Inform the privileged process about service and style */
318:
319: void
320: mm_inform_authserv(char *service, char *style)
321: {
322: Buffer m;
323:
1.8 markus 324: debug3("%s entering", __func__);
1.1 provos 325:
326: buffer_init(&m);
327: buffer_put_cstring(&m, service);
328: buffer_put_cstring(&m, style ? style : "");
329:
1.7 mouring 330: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 331:
332: buffer_free(&m);
333: }
334:
335: /* Do the password authentication */
336: int
1.99 djm 337: mm_auth_password(struct ssh *ssh, char *password)
1.1 provos 338: {
339: Buffer m;
340: int authenticated = 0;
341:
1.8 markus 342: debug3("%s entering", __func__);
1.1 provos 343:
344: buffer_init(&m);
345: buffer_put_cstring(&m, password);
1.7 mouring 346: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 347:
1.8 markus 348: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 349: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 350:
351: authenticated = buffer_get_int(&m);
352:
353: buffer_free(&m);
354:
1.3 markus 355: debug3("%s: user %sauthenticated",
1.8 markus 356: __func__, authenticated ? "" : "not ");
1.1 provos 357: return (authenticated);
358: }
359:
360: int
1.99 djm 361: mm_user_key_allowed(struct ssh *ssh, struct passwd *pw, struct sshkey *key,
362: int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 363: {
1.85 djm 364: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
1.99 djm 365: pubkey_auth_attempt, authoptp));
1.1 provos 366: }
367:
368: int
1.88 djm 369: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 370: struct sshkey *key)
1.1 provos 371: {
1.99 djm 372: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0, NULL));
1.1 provos 373: }
374:
375: int
1.88 djm 376: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.99 djm 377: struct sshkey *key, int pubkey_auth_attempt, struct sshauthopt **authoptp)
1.1 provos 378: {
379: Buffer m;
380: u_char *blob;
381: u_int len;
1.99 djm 382: int r, allowed = 0;
383: struct sshauthopt *opts = NULL;
1.1 provos 384:
1.8 markus 385: debug3("%s entering", __func__);
1.1 provos 386:
1.99 djm 387: if (authoptp != NULL)
388: *authoptp = NULL;
389:
1.1 provos 390: /* Convert the key to a blob and the pass it over */
391: if (!key_to_blob(key, &blob, &len))
1.99 djm 392: return 0;
1.1 provos 393:
394: buffer_init(&m);
395: buffer_put_int(&m, type);
396: buffer_put_cstring(&m, user ? user : "");
397: buffer_put_cstring(&m, host ? host : "");
398: buffer_put_string(&m, blob, len);
1.85 djm 399: buffer_put_int(&m, pubkey_auth_attempt);
1.76 djm 400: free(blob);
1.1 provos 401:
1.7 mouring 402: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 403:
1.8 markus 404: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.99 djm 405: mm_request_receive_expect(pmonitor->m_recvfd,
406: MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 407:
408: allowed = buffer_get_int(&m);
1.99 djm 409: if (allowed && type == MM_USERKEY) {
410: if ((r = sshauthopt_deserialise(&m, &opts)) != 0)
411: fatal("%s: sshauthopt_deserialise: %s",
412: __func__, ssh_err(r));
413: }
414: buffer_free(&m);
1.1 provos 415:
1.99 djm 416: if (authoptp != NULL) {
417: *authoptp = opts;
418: opts = NULL;
419: }
420: sshauthopt_free(opts);
1.1 provos 421:
1.99 djm 422: return allowed;
1.1 provos 423: }
424:
1.3 markus 425: /*
1.1 provos 426: * This key verify needs to send the key type along, because the
427: * privileged parent makes the decision if the key is allowed
428: * for authentication.
429: */
430:
431: int
1.92 markus 432: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
1.96 djm 433: const u_char *data, size_t datalen, const char *sigalg, u_int compat)
1.1 provos 434: {
435: Buffer m;
436: u_char *blob;
437: u_int len;
1.92 markus 438: u_int encoded_ret = 0;
1.1 provos 439:
1.8 markus 440: debug3("%s entering", __func__);
1.1 provos 441:
442: /* Convert the key to a blob and the pass it over */
443: if (!key_to_blob(key, &blob, &len))
444: return (0);
445:
446: buffer_init(&m);
447: buffer_put_string(&m, blob, len);
448: buffer_put_string(&m, sig, siglen);
449: buffer_put_string(&m, data, datalen);
1.97 djm 450: buffer_put_cstring(&m, sigalg == NULL ? "" : sigalg);
1.76 djm 451: free(blob);
1.1 provos 452:
1.7 mouring 453: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 454:
1.8 markus 455: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 456: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 457:
1.92 markus 458: encoded_ret = buffer_get_int(&m);
1.1 provos 459:
460: buffer_free(&m);
461:
1.92 markus 462: if (encoded_ret != 0)
463: return SSH_ERR_SIGNATURE_INVALID;
464: return 0;
1.1 provos 465: }
466:
467: void
1.36 avsm 468: mm_send_keystate(struct monitor *monitor)
1.1 provos 469: {
1.82 markus 470: struct ssh *ssh = active_state; /* XXX */
471: struct sshbuf *m;
472: int r;
473:
474: if ((m = sshbuf_new()) == NULL)
475: fatal("%s: sshbuf_new failed", __func__);
476: if ((r = ssh_packet_get_state(ssh, m)) != 0)
477: fatal("%s: get_state failed: %s",
478: __func__, ssh_err(r));
479: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 480: debug3("%s: Finished sending state", __func__);
1.82 markus 481: sshbuf_free(m);
1.1 provos 482: }
483:
484: int
1.42 deraadt 485: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 486: {
487: Buffer m;
1.39 dtucker 488: char *p, *msg;
1.62 djm 489: int success = 0, tmp1 = -1, tmp2 = -1;
490:
491: /* Kludge: ensure there are fds free to receive the pty/tty */
492: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
493: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
494: error("%s: cannot allocate fds for pty", __func__);
495: if (tmp1 > 0)
496: close(tmp1);
497: if (tmp2 > 0)
498: close(tmp2);
499: return 0;
500: }
501: close(tmp1);
502: close(tmp2);
1.1 provos 503:
504: buffer_init(&m);
1.7 mouring 505: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 506:
1.8 markus 507: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 508: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 509:
510: success = buffer_get_int(&m);
511: if (success == 0) {
1.8 markus 512: debug3("%s: pty alloc failed", __func__);
1.1 provos 513: buffer_free(&m);
514: return (0);
515: }
516: p = buffer_get_string(&m, NULL);
1.39 dtucker 517: msg = buffer_get_string(&m, NULL);
1.1 provos 518: buffer_free(&m);
519:
520: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 521: free(p);
1.39 dtucker 522:
523: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 524: free(msg);
1.1 provos 525:
1.58 djm 526: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
527: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
528: fatal("%s: receive fds failed", __func__);
1.1 provos 529:
530: /* Success */
531: return (1);
532: }
533:
534: void
1.32 markus 535: mm_session_pty_cleanup2(Session *s)
1.1 provos 536: {
537: Buffer m;
538:
539: if (s->ttyfd == -1)
540: return;
541: buffer_init(&m);
542: buffer_put_cstring(&m, s->tty);
1.7 mouring 543: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 544: buffer_free(&m);
1.3 markus 545:
1.1 provos 546: /* closed dup'ed master */
1.62 djm 547: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
548: error("close(s->ptymaster/%d): %s",
549: s->ptymaster, strerror(errno));
1.1 provos 550:
551: /* unlink pty from session */
552: s->ttyfd = -1;
553: }
554:
555: /* Request process termination */
556:
557: void
558: mm_terminate(void)
559: {
560: Buffer m;
561:
562: buffer_init(&m);
1.7 mouring 563: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 564: buffer_free(&m);
565: }
566:
1.2 markus 567: static void
1.1 provos 568: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
569: char ***prompts, u_int **echo_on)
570: {
1.10 deraadt 571: *name = xstrdup("");
572: *infotxt = xstrdup("");
1.1 provos 573: *numprompts = 1;
1.43 djm 574: *prompts = xcalloc(*numprompts, sizeof(char *));
575: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 576: (*echo_on)[0] = 0;
577: }
578:
579: int
580: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
581: u_int *numprompts, char ***prompts, u_int **echo_on)
582: {
583: Buffer m;
1.21 markus 584: u_int success;
1.1 provos 585: char *challenge;
586:
1.8 markus 587: debug3("%s: entering", __func__);
1.1 provos 588:
589: buffer_init(&m);
1.7 mouring 590: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 591:
1.7 mouring 592: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 593: &m);
1.21 markus 594: success = buffer_get_int(&m);
595: if (success == 0) {
1.8 markus 596: debug3("%s: no challenge", __func__);
1.1 provos 597: buffer_free(&m);
598: return (-1);
599: }
600:
601: /* Get the challenge, and format the response */
602: challenge = buffer_get_string(&m, NULL);
603: buffer_free(&m);
604:
605: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
606: (*prompts)[0] = challenge;
607:
1.8 markus 608: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 609:
610: return (0);
611: }
612:
613: int
614: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
615: {
616: Buffer m;
617: int authok;
618:
1.8 markus 619: debug3("%s: entering", __func__);
1.1 provos 620: if (numresponses != 1)
621: return (-1);
622:
623: buffer_init(&m);
624: buffer_put_cstring(&m, responses[0]);
1.7 mouring 625: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 626:
1.7 mouring 627: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 628: MONITOR_ANS_BSDAUTHRESPOND, &m);
629:
630: authok = buffer_get_int(&m);
631: buffer_free(&m);
632:
633: return ((authok == 0) ? -1 : 0);
634: }
1.29 markus 635:
636: #ifdef GSSAPI
637: OM_uint32
1.36 avsm 638: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 639: {
640: Buffer m;
641: OM_uint32 major;
642:
643: /* Client doesn't get to see the context */
644: *ctx = NULL;
645:
646: buffer_init(&m);
1.36 avsm 647: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 648:
649: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
650: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
651:
652: major = buffer_get_int(&m);
653:
654: buffer_free(&m);
655: return (major);
656: }
657:
658: OM_uint32
659: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
660: gss_buffer_desc *out, OM_uint32 *flags)
661: {
662: Buffer m;
663: OM_uint32 major;
1.30 deraadt 664: u_int len;
1.29 markus 665:
666: buffer_init(&m);
667: buffer_put_string(&m, in->value, in->length);
668:
669: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
670: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
671:
672: major = buffer_get_int(&m);
1.30 deraadt 673: out->value = buffer_get_string(&m, &len);
674: out->length = len;
1.29 markus 675: if (flags)
676: *flags = buffer_get_int(&m);
677:
678: buffer_free(&m);
679:
680: return (major);
1.35 markus 681: }
682:
683: OM_uint32
684: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
685: {
686: Buffer m;
687: OM_uint32 major;
688:
689: buffer_init(&m);
690: buffer_put_string(&m, gssbuf->value, gssbuf->length);
691: buffer_put_string(&m, gssmic->value, gssmic->length);
692:
693: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
694: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
695: &m);
696:
697: major = buffer_get_int(&m);
698: buffer_free(&m);
699: return(major);
1.29 markus 700: }
701:
702: int
703: mm_ssh_gssapi_userok(char *user)
704: {
705: Buffer m;
706: int authenticated = 0;
707:
708: buffer_init(&m);
709:
710: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
711: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
712: &m);
713:
714: authenticated = buffer_get_int(&m);
715:
716: buffer_free(&m);
717: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
718: return (authenticated);
719: }
720: #endif /* GSSAPI */
1.64 djm 721:
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