Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.94
1.94 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.93 2017/09/12 06:32:07 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"
1.70 djm 68: #include "uuencode.h"
1.1 provos 69:
70: #include "channels.h"
71: #include "session.h"
1.55 dtucker 72: #include "servconf.h"
1.29 markus 73:
1.82 markus 74: #include "ssherr.h"
75:
1.1 provos 76: /* Imports */
77: extern z_stream incoming_stream;
78: extern z_stream outgoing_stream;
1.7 mouring 79: extern struct monitor *pmonitor;
1.39 dtucker 80: extern Buffer loginmsg;
1.55 dtucker 81: extern ServerOptions options;
1.73 djm 82:
83: void
84: mm_log_handler(LogLevel level, const char *msg, void *ctx)
85: {
86: Buffer log_msg;
87: struct monitor *mon = (struct monitor *)ctx;
88:
89: if (mon->m_log_sendfd == -1)
90: fatal("%s: no log channel", __func__);
91:
92: buffer_init(&log_msg);
93: /*
94: * Placeholder for packet length. Will be filled in with the actual
95: * packet length once the packet has been constucted. This saves
96: * fragile math.
97: */
98: buffer_put_int(&log_msg, 0);
99:
100: buffer_put_int(&log_msg, level);
101: buffer_put_cstring(&log_msg, msg);
102: put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
103: if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
104: buffer_len(&log_msg)) != buffer_len(&log_msg))
105: fatal("%s: write: %s", __func__, strerror(errno));
106: buffer_free(&log_msg);
107: }
1.1 provos 108:
1.32 markus 109: int
110: mm_is_monitor(void)
111: {
112: /*
113: * m_pid is only set in the privileged part, and
114: * points to the unprivileged child.
115: */
1.34 markus 116: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 117: }
118:
1.1 provos 119: void
1.36 avsm 120: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 121: {
1.13 deraadt 122: u_int mlen = buffer_len(m);
1.1 provos 123: u_char buf[5];
124:
1.8 markus 125: debug3("%s entering: type %d", __func__, type);
1.1 provos 126:
1.45 djm 127: put_u32(buf, mlen + 1);
1.10 deraadt 128: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 129: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 130: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 131: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 132: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 133: }
134:
135: void
1.36 avsm 136: mm_request_receive(int sock, Buffer *m)
1.1 provos 137: {
138: u_char buf[4];
1.13 deraadt 139: u_int msg_len;
1.1 provos 140:
1.8 markus 141: debug3("%s entering", __func__);
1.1 provos 142:
1.40 avsm 143: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
144: if (errno == EPIPE)
1.32 markus 145: cleanup_exit(255);
1.40 avsm 146: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 147: }
1.45 djm 148: msg_len = get_u32(buf);
1.1 provos 149: if (msg_len > 256 * 1024)
1.8 markus 150: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 151: buffer_clear(m);
152: buffer_append_space(m, msg_len);
1.40 avsm 153: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
154: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 155: }
156:
157: void
1.36 avsm 158: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 159: {
160: u_char rtype;
161:
1.8 markus 162: debug3("%s entering: type %d", __func__, type);
1.1 provos 163:
1.36 avsm 164: mm_request_receive(sock, m);
1.1 provos 165: rtype = buffer_get_char(m);
166: if (rtype != type)
1.8 markus 167: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 168: rtype, type);
169: }
170:
1.80 markus 171: #ifdef WITH_OPENSSL
1.1 provos 172: DH *
173: mm_choose_dh(int min, int nbits, int max)
174: {
175: BIGNUM *p, *g;
176: int success = 0;
177: Buffer m;
178:
179: buffer_init(&m);
180: buffer_put_int(&m, min);
181: buffer_put_int(&m, nbits);
182: buffer_put_int(&m, max);
183:
1.7 mouring 184: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 185:
1.8 markus 186: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 187: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 188:
189: success = buffer_get_char(&m);
190: if (success == 0)
1.8 markus 191: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 192:
193: if ((p = BN_new()) == NULL)
1.8 markus 194: fatal("%s: BN_new failed", __func__);
1.3 markus 195: if ((g = BN_new()) == NULL)
1.8 markus 196: fatal("%s: BN_new failed", __func__);
1.1 provos 197: buffer_get_bignum2(&m, p);
198: buffer_get_bignum2(&m, g);
199:
1.8 markus 200: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 201: buffer_free(&m);
202:
203: return (dh_new_group(g, p));
204: }
1.80 markus 205: #endif
1.1 provos 206:
207: int
1.91 markus 208: mm_key_sign(struct sshkey *key, u_char **sigp, u_int *lenp,
1.86 markus 209: const u_char *data, u_int datalen, const char *hostkey_alg)
1.1 provos 210: {
1.83 markus 211: struct kex *kex = *pmonitor->m_pkex;
1.1 provos 212: Buffer m;
213:
1.8 markus 214: debug3("%s entering", __func__);
1.1 provos 215:
216: buffer_init(&m);
1.84 djm 217: buffer_put_int(&m, kex->host_key_index(key, 0, active_state));
1.1 provos 218: buffer_put_string(&m, data, datalen);
1.86 markus 219: buffer_put_cstring(&m, hostkey_alg);
1.1 provos 220:
1.7 mouring 221: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 222:
1.8 markus 223: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 224: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 225: *sigp = buffer_get_string(&m, lenp);
226: buffer_free(&m);
227:
228: return (0);
229: }
230:
231: struct passwd *
1.37 dtucker 232: mm_getpwnamallow(const char *username)
1.1 provos 233: {
1.93 djm 234: struct ssh *ssh = active_state; /* XXX */
1.1 provos 235: Buffer m;
236: struct passwd *pw;
1.72 djm 237: u_int len, i;
1.55 dtucker 238: ServerOptions *newopts;
1.1 provos 239:
1.8 markus 240: debug3("%s entering", __func__);
1.1 provos 241:
242: buffer_init(&m);
1.37 dtucker 243: buffer_put_cstring(&m, username);
1.1 provos 244:
1.7 mouring 245: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 246:
1.8 markus 247: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 248: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 249:
250: if (buffer_get_char(&m) == 0) {
1.60 dtucker 251: pw = NULL;
252: goto out;
1.1 provos 253: }
1.55 dtucker 254: pw = buffer_get_string(&m, &len);
255: if (len != sizeof(struct passwd))
1.8 markus 256: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 257: pw->pw_name = buffer_get_string(&m, NULL);
258: pw->pw_passwd = buffer_get_string(&m, NULL);
259: pw->pw_gecos = buffer_get_string(&m, NULL);
260: pw->pw_class = buffer_get_string(&m, NULL);
261: pw->pw_dir = buffer_get_string(&m, NULL);
262: pw->pw_shell = buffer_get_string(&m, NULL);
1.55 dtucker 263:
1.60 dtucker 264: out:
1.55 dtucker 265: /* copy options block as a Match directive may have changed some */
266: newopts = buffer_get_string(&m, &len);
267: if (len != sizeof(*newopts))
268: fatal("%s: option block size mismatch", __func__);
1.71 djm 269:
270: #define M_CP_STROPT(x) do { \
271: if (newopts->x != NULL) \
272: newopts->x = buffer_get_string(&m, NULL); \
273: } while (0)
1.72 djm 274: #define M_CP_STRARRAYOPT(x, nx) do { \
275: for (i = 0; i < newopts->nx; i++) \
276: newopts->x[i] = buffer_get_string(&m, NULL); \
277: } while (0)
1.94 ! djm 278: #define M_CP_STRARRAYOPT_ALLOC(x, nx) do { \
! 279: newopts->x = newopts->nx == 0 ? \
! 280: NULL : xcalloc(newopts->nx, sizeof(*newopts->x)); \
! 281: M_CP_STRARRAYOPT(x, nx); \
! 282: } while (0)
1.71 djm 283: /* See comment in servconf.h */
284: COPY_MATCH_STRING_OPTS();
285: #undef M_CP_STROPT
1.72 djm 286: #undef M_CP_STRARRAYOPT
1.94 ! djm 287: #undef M_CP_STRARRAYOPT_ALLOC
1.71 djm 288:
1.55 dtucker 289: copy_set_server_options(&options, newopts, 1);
1.90 djm 290: log_change_level(options.log_level);
1.93 djm 291: process_permitopen(ssh, &options);
1.76 djm 292: free(newopts);
1.55 dtucker 293:
1.1 provos 294: buffer_free(&m);
295:
296: return (pw);
1.6 djm 297: }
298:
1.33 markus 299: char *
300: mm_auth2_read_banner(void)
1.6 djm 301: {
302: Buffer m;
303: char *banner;
304:
1.8 markus 305: debug3("%s entering", __func__);
1.6 djm 306:
307: buffer_init(&m);
1.7 mouring 308: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 309: buffer_clear(&m);
310:
1.33 markus 311: mm_request_receive_expect(pmonitor->m_recvfd,
312: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 313: banner = buffer_get_string(&m, NULL);
314: buffer_free(&m);
1.10 deraadt 315:
1.33 markus 316: /* treat empty banner as missing banner */
317: if (strlen(banner) == 0) {
1.76 djm 318: free(banner);
1.33 markus 319: banner = NULL;
320: }
1.6 djm 321: return (banner);
1.1 provos 322: }
323:
324: /* Inform the privileged process about service and style */
325:
326: void
327: mm_inform_authserv(char *service, char *style)
328: {
329: Buffer m;
330:
1.8 markus 331: debug3("%s entering", __func__);
1.1 provos 332:
333: buffer_init(&m);
334: buffer_put_cstring(&m, service);
335: buffer_put_cstring(&m, style ? style : "");
336:
1.7 mouring 337: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 338:
339: buffer_free(&m);
340: }
341:
342: /* Do the password authentication */
343: int
344: mm_auth_password(Authctxt *authctxt, char *password)
345: {
346: Buffer m;
347: int authenticated = 0;
348:
1.8 markus 349: debug3("%s entering", __func__);
1.1 provos 350:
351: buffer_init(&m);
352: buffer_put_cstring(&m, password);
1.7 mouring 353: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 354:
1.8 markus 355: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 356: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 357:
358: authenticated = buffer_get_int(&m);
359:
360: buffer_free(&m);
361:
1.3 markus 362: debug3("%s: user %sauthenticated",
1.8 markus 363: __func__, authenticated ? "" : "not ");
1.1 provos 364: return (authenticated);
365: }
366:
367: int
1.91 markus 368: mm_user_key_allowed(struct passwd *pw, struct sshkey *key,
369: int pubkey_auth_attempt)
1.1 provos 370: {
1.85 djm 371: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
372: pubkey_auth_attempt));
1.1 provos 373: }
374:
375: int
1.88 djm 376: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 377: struct sshkey *key)
1.1 provos 378: {
1.85 djm 379: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0));
1.1 provos 380: }
381:
382: int
1.88 djm 383: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.91 markus 384: struct sshkey *key, int pubkey_auth_attempt)
1.1 provos 385: {
386: Buffer m;
387: u_char *blob;
388: u_int len;
1.22 markus 389: int allowed = 0, have_forced = 0;
1.1 provos 390:
1.8 markus 391: debug3("%s entering", __func__);
1.1 provos 392:
393: /* Convert the key to a blob and the pass it over */
394: if (!key_to_blob(key, &blob, &len))
395: return (0);
396:
397: buffer_init(&m);
398: buffer_put_int(&m, type);
399: buffer_put_cstring(&m, user ? user : "");
400: buffer_put_cstring(&m, host ? host : "");
401: buffer_put_string(&m, blob, len);
1.85 djm 402: buffer_put_int(&m, pubkey_auth_attempt);
1.76 djm 403: free(blob);
1.1 provos 404:
1.7 mouring 405: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 406:
1.8 markus 407: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 408: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 409:
410: allowed = buffer_get_int(&m);
411:
1.22 markus 412: /* fake forced command */
413: auth_clear_options();
414: have_forced = buffer_get_int(&m);
415: forced_command = have_forced ? xstrdup("true") : NULL;
416:
1.1 provos 417: buffer_free(&m);
418:
419: return (allowed);
420: }
421:
1.3 markus 422: /*
1.1 provos 423: * This key verify needs to send the key type along, because the
424: * privileged parent makes the decision if the key is allowed
425: * for authentication.
426: */
427:
428: int
1.92 markus 429: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
430: const u_char *data, size_t datalen, u_int compat)
1.1 provos 431: {
432: Buffer m;
433: u_char *blob;
434: u_int len;
1.92 markus 435: u_int encoded_ret = 0;
1.1 provos 436:
1.8 markus 437: debug3("%s entering", __func__);
1.1 provos 438:
439: /* Convert the key to a blob and the pass it over */
440: if (!key_to_blob(key, &blob, &len))
441: return (0);
442:
443: buffer_init(&m);
444: buffer_put_string(&m, blob, len);
445: buffer_put_string(&m, sig, siglen);
446: buffer_put_string(&m, data, datalen);
1.76 djm 447: free(blob);
1.1 provos 448:
1.7 mouring 449: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 450:
1.8 markus 451: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 452: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 453:
1.92 markus 454: encoded_ret = buffer_get_int(&m);
1.1 provos 455:
456: buffer_free(&m);
457:
1.92 markus 458: if (encoded_ret != 0)
459: return SSH_ERR_SIGNATURE_INVALID;
460: return 0;
1.1 provos 461: }
462:
463: void
1.36 avsm 464: mm_send_keystate(struct monitor *monitor)
1.1 provos 465: {
1.82 markus 466: struct ssh *ssh = active_state; /* XXX */
467: struct sshbuf *m;
468: int r;
469:
470: if ((m = sshbuf_new()) == NULL)
471: fatal("%s: sshbuf_new failed", __func__);
472: if ((r = ssh_packet_get_state(ssh, m)) != 0)
473: fatal("%s: get_state failed: %s",
474: __func__, ssh_err(r));
475: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 476: debug3("%s: Finished sending state", __func__);
1.82 markus 477: sshbuf_free(m);
1.1 provos 478: }
479:
480: int
1.42 deraadt 481: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 482: {
483: Buffer m;
1.39 dtucker 484: char *p, *msg;
1.62 djm 485: int success = 0, tmp1 = -1, tmp2 = -1;
486:
487: /* Kludge: ensure there are fds free to receive the pty/tty */
488: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
489: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
490: error("%s: cannot allocate fds for pty", __func__);
491: if (tmp1 > 0)
492: close(tmp1);
493: if (tmp2 > 0)
494: close(tmp2);
495: return 0;
496: }
497: close(tmp1);
498: close(tmp2);
1.1 provos 499:
500: buffer_init(&m);
1.7 mouring 501: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 502:
1.8 markus 503: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 504: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 505:
506: success = buffer_get_int(&m);
507: if (success == 0) {
1.8 markus 508: debug3("%s: pty alloc failed", __func__);
1.1 provos 509: buffer_free(&m);
510: return (0);
511: }
512: p = buffer_get_string(&m, NULL);
1.39 dtucker 513: msg = buffer_get_string(&m, NULL);
1.1 provos 514: buffer_free(&m);
515:
516: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 517: free(p);
1.39 dtucker 518:
519: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 520: free(msg);
1.1 provos 521:
1.58 djm 522: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
523: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
524: fatal("%s: receive fds failed", __func__);
1.1 provos 525:
526: /* Success */
527: return (1);
528: }
529:
530: void
1.32 markus 531: mm_session_pty_cleanup2(Session *s)
1.1 provos 532: {
533: Buffer m;
534:
535: if (s->ttyfd == -1)
536: return;
537: buffer_init(&m);
538: buffer_put_cstring(&m, s->tty);
1.7 mouring 539: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 540: buffer_free(&m);
1.3 markus 541:
1.1 provos 542: /* closed dup'ed master */
1.62 djm 543: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
544: error("close(s->ptymaster/%d): %s",
545: s->ptymaster, strerror(errno));
1.1 provos 546:
547: /* unlink pty from session */
548: s->ttyfd = -1;
549: }
550:
551: /* Request process termination */
552:
553: void
554: mm_terminate(void)
555: {
556: Buffer m;
557:
558: buffer_init(&m);
1.7 mouring 559: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 560: buffer_free(&m);
561: }
562:
1.2 markus 563: static void
1.1 provos 564: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
565: char ***prompts, u_int **echo_on)
566: {
1.10 deraadt 567: *name = xstrdup("");
568: *infotxt = xstrdup("");
1.1 provos 569: *numprompts = 1;
1.43 djm 570: *prompts = xcalloc(*numprompts, sizeof(char *));
571: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 572: (*echo_on)[0] = 0;
573: }
574:
575: int
576: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
577: u_int *numprompts, char ***prompts, u_int **echo_on)
578: {
579: Buffer m;
1.21 markus 580: u_int success;
1.1 provos 581: char *challenge;
582:
1.8 markus 583: debug3("%s: entering", __func__);
1.1 provos 584:
585: buffer_init(&m);
1.7 mouring 586: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 587:
1.7 mouring 588: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 589: &m);
1.21 markus 590: success = buffer_get_int(&m);
591: if (success == 0) {
1.8 markus 592: debug3("%s: no challenge", __func__);
1.1 provos 593: buffer_free(&m);
594: return (-1);
595: }
596:
597: /* Get the challenge, and format the response */
598: challenge = buffer_get_string(&m, NULL);
599: buffer_free(&m);
600:
601: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
602: (*prompts)[0] = challenge;
603:
1.8 markus 604: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 605:
606: return (0);
607: }
608:
609: int
610: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
611: {
612: Buffer m;
613: int authok;
614:
1.8 markus 615: debug3("%s: entering", __func__);
1.1 provos 616: if (numresponses != 1)
617: return (-1);
618:
619: buffer_init(&m);
620: buffer_put_cstring(&m, responses[0]);
1.7 mouring 621: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 622:
1.7 mouring 623: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 624: MONITOR_ANS_BSDAUTHRESPOND, &m);
625:
626: authok = buffer_get_int(&m);
627: buffer_free(&m);
628:
629: return ((authok == 0) ? -1 : 0);
630: }
1.29 markus 631:
632: #ifdef GSSAPI
633: OM_uint32
1.36 avsm 634: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 635: {
636: Buffer m;
637: OM_uint32 major;
638:
639: /* Client doesn't get to see the context */
640: *ctx = NULL;
641:
642: buffer_init(&m);
1.36 avsm 643: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 644:
645: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
646: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
647:
648: major = buffer_get_int(&m);
649:
650: buffer_free(&m);
651: return (major);
652: }
653:
654: OM_uint32
655: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
656: gss_buffer_desc *out, OM_uint32 *flags)
657: {
658: Buffer m;
659: OM_uint32 major;
1.30 deraadt 660: u_int len;
1.29 markus 661:
662: buffer_init(&m);
663: buffer_put_string(&m, in->value, in->length);
664:
665: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
666: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
667:
668: major = buffer_get_int(&m);
1.30 deraadt 669: out->value = buffer_get_string(&m, &len);
670: out->length = len;
1.29 markus 671: if (flags)
672: *flags = buffer_get_int(&m);
673:
674: buffer_free(&m);
675:
676: return (major);
1.35 markus 677: }
678:
679: OM_uint32
680: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
681: {
682: Buffer m;
683: OM_uint32 major;
684:
685: buffer_init(&m);
686: buffer_put_string(&m, gssbuf->value, gssbuf->length);
687: buffer_put_string(&m, gssmic->value, gssmic->length);
688:
689: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
690: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
691: &m);
692:
693: major = buffer_get_int(&m);
694: buffer_free(&m);
695: return(major);
1.29 markus 696: }
697:
698: int
699: mm_ssh_gssapi_userok(char *user)
700: {
701: Buffer m;
702: int authenticated = 0;
703:
704: buffer_init(&m);
705:
706: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
707: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
708: &m);
709:
710: authenticated = buffer_get_int(&m);
711:
712: buffer_free(&m);
713: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
714: return (authenticated);
715: }
716: #endif /* GSSAPI */
1.64 djm 717:
![[BACK]](/icons/back.gif){kind=icon}
Return to monitor_wrap.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh