Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.84
1.84 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.83 2015/01/19 20:16:15 markus 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"
1.67 andreas 73: #include "roaming.h"
1.29 markus 74:
1.82 markus 75: #include "ssherr.h"
76:
1.1 provos 77: /* Imports */
78: extern int compat20;
79: extern z_stream incoming_stream;
80: extern z_stream outgoing_stream;
1.7 mouring 81: extern struct monitor *pmonitor;
1.39 dtucker 82: extern Buffer loginmsg;
1.55 dtucker 83: extern ServerOptions options;
1.73 djm 84:
85: void
86: mm_log_handler(LogLevel level, const char *msg, void *ctx)
87: {
88: Buffer log_msg;
89: struct monitor *mon = (struct monitor *)ctx;
90:
91: if (mon->m_log_sendfd == -1)
92: fatal("%s: no log channel", __func__);
93:
94: buffer_init(&log_msg);
95: /*
96: * Placeholder for packet length. Will be filled in with the actual
97: * packet length once the packet has been constucted. This saves
98: * fragile math.
99: */
100: buffer_put_int(&log_msg, 0);
101:
102: buffer_put_int(&log_msg, level);
103: buffer_put_cstring(&log_msg, msg);
104: put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
105: if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
106: buffer_len(&log_msg)) != buffer_len(&log_msg))
107: fatal("%s: write: %s", __func__, strerror(errno));
108: buffer_free(&log_msg);
109: }
1.1 provos 110:
1.32 markus 111: int
112: mm_is_monitor(void)
113: {
114: /*
115: * m_pid is only set in the privileged part, and
116: * points to the unprivileged child.
117: */
1.34 markus 118: return (pmonitor && pmonitor->m_pid > 0);
1.32 markus 119: }
120:
1.1 provos 121: void
1.36 avsm 122: mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 123: {
1.13 deraadt 124: u_int mlen = buffer_len(m);
1.1 provos 125: u_char buf[5];
126:
1.8 markus 127: debug3("%s entering: type %d", __func__, type);
1.1 provos 128:
1.45 djm 129: put_u32(buf, mlen + 1);
1.10 deraadt 130: buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
1.36 avsm 131: if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
1.40 avsm 132: fatal("%s: write: %s", __func__, strerror(errno));
1.36 avsm 133: if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
1.40 avsm 134: fatal("%s: write: %s", __func__, strerror(errno));
1.1 provos 135: }
136:
137: void
1.36 avsm 138: mm_request_receive(int sock, Buffer *m)
1.1 provos 139: {
140: u_char buf[4];
1.13 deraadt 141: u_int msg_len;
1.1 provos 142:
1.8 markus 143: debug3("%s entering", __func__);
1.1 provos 144:
1.40 avsm 145: if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
146: if (errno == EPIPE)
1.32 markus 147: cleanup_exit(255);
1.40 avsm 148: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 149: }
1.45 djm 150: msg_len = get_u32(buf);
1.1 provos 151: if (msg_len > 256 * 1024)
1.8 markus 152: fatal("%s: read: bad msg_len %d", __func__, msg_len);
1.1 provos 153: buffer_clear(m);
154: buffer_append_space(m, msg_len);
1.40 avsm 155: if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
156: fatal("%s: read: %s", __func__, strerror(errno));
1.1 provos 157: }
158:
159: void
1.36 avsm 160: mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
1.1 provos 161: {
162: u_char rtype;
163:
1.8 markus 164: debug3("%s entering: type %d", __func__, type);
1.1 provos 165:
1.36 avsm 166: mm_request_receive(sock, m);
1.1 provos 167: rtype = buffer_get_char(m);
168: if (rtype != type)
1.8 markus 169: fatal("%s: read: rtype %d != type %d", __func__,
1.1 provos 170: rtype, type);
171: }
172:
1.80 markus 173: #ifdef WITH_OPENSSL
1.1 provos 174: DH *
175: mm_choose_dh(int min, int nbits, int max)
176: {
177: BIGNUM *p, *g;
178: int success = 0;
179: Buffer m;
180:
181: buffer_init(&m);
182: buffer_put_int(&m, min);
183: buffer_put_int(&m, nbits);
184: buffer_put_int(&m, max);
185:
1.7 mouring 186: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
1.1 provos 187:
1.8 markus 188: debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
1.7 mouring 189: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
1.1 provos 190:
191: success = buffer_get_char(&m);
192: if (success == 0)
1.8 markus 193: fatal("%s: MONITOR_ANS_MODULI failed", __func__);
1.1 provos 194:
195: if ((p = BN_new()) == NULL)
1.8 markus 196: fatal("%s: BN_new failed", __func__);
1.3 markus 197: if ((g = BN_new()) == NULL)
1.8 markus 198: fatal("%s: BN_new failed", __func__);
1.1 provos 199: buffer_get_bignum2(&m, p);
200: buffer_get_bignum2(&m, g);
201:
1.8 markus 202: debug3("%s: remaining %d", __func__, buffer_len(&m));
1.1 provos 203: buffer_free(&m);
204:
205: return (dh_new_group(g, p));
206: }
1.80 markus 207: #endif
1.1 provos 208:
209: int
1.84 ! djm 210: mm_key_sign(Key *key, u_char **sigp, u_int *lenp,
! 211: const u_char *data, u_int datalen)
1.1 provos 212: {
1.83 markus 213: struct kex *kex = *pmonitor->m_pkex;
1.1 provos 214: Buffer m;
215:
1.8 markus 216: debug3("%s entering", __func__);
1.1 provos 217:
218: buffer_init(&m);
1.84 ! djm 219: buffer_put_int(&m, kex->host_key_index(key, 0, active_state));
1.1 provos 220: buffer_put_string(&m, data, datalen);
221:
1.7 mouring 222: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 223:
1.8 markus 224: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 225: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 226: *sigp = buffer_get_string(&m, lenp);
227: buffer_free(&m);
228:
229: return (0);
230: }
231:
232: struct passwd *
1.37 dtucker 233: mm_getpwnamallow(const char *username)
1.1 provos 234: {
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)
1.71 djm 278: /* See comment in servconf.h */
279: COPY_MATCH_STRING_OPTS();
280: #undef M_CP_STROPT
1.72 djm 281: #undef M_CP_STRARRAYOPT
1.71 djm 282:
1.55 dtucker 283: copy_set_server_options(&options, newopts, 1);
1.76 djm 284: free(newopts);
1.55 dtucker 285:
1.1 provos 286: buffer_free(&m);
287:
288: return (pw);
1.6 djm 289: }
290:
1.33 markus 291: char *
292: mm_auth2_read_banner(void)
1.6 djm 293: {
294: Buffer m;
295: char *banner;
296:
1.8 markus 297: debug3("%s entering", __func__);
1.6 djm 298:
299: buffer_init(&m);
1.7 mouring 300: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 301: buffer_clear(&m);
302:
1.33 markus 303: mm_request_receive_expect(pmonitor->m_recvfd,
304: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 305: banner = buffer_get_string(&m, NULL);
306: buffer_free(&m);
1.10 deraadt 307:
1.33 markus 308: /* treat empty banner as missing banner */
309: if (strlen(banner) == 0) {
1.76 djm 310: free(banner);
1.33 markus 311: banner = NULL;
312: }
1.6 djm 313: return (banner);
1.1 provos 314: }
315:
316: /* Inform the privileged process about service and style */
317:
318: void
319: mm_inform_authserv(char *service, char *style)
320: {
321: Buffer m;
322:
1.8 markus 323: debug3("%s entering", __func__);
1.1 provos 324:
325: buffer_init(&m);
326: buffer_put_cstring(&m, service);
327: buffer_put_cstring(&m, style ? style : "");
328:
1.7 mouring 329: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 330:
331: buffer_free(&m);
332: }
333:
334: /* Do the password authentication */
335: int
336: mm_auth_password(Authctxt *authctxt, char *password)
337: {
338: Buffer m;
339: int authenticated = 0;
340:
1.8 markus 341: debug3("%s entering", __func__);
1.1 provos 342:
343: buffer_init(&m);
344: buffer_put_cstring(&m, password);
1.7 mouring 345: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 346:
1.8 markus 347: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 348: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 349:
350: authenticated = buffer_get_int(&m);
351:
352: buffer_free(&m);
353:
1.3 markus 354: debug3("%s: user %sauthenticated",
1.8 markus 355: __func__, authenticated ? "" : "not ");
1.1 provos 356: return (authenticated);
357: }
358:
359: int
360: mm_user_key_allowed(struct passwd *pw, Key *key)
361: {
362: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
363: }
364:
365: int
366: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
367: Key *key)
368: {
369: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
370: }
371:
372: int
373: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
374: char *host, Key *key)
375: {
376: int ret;
377:
378: key->type = KEY_RSA; /* XXX hack for key_to_blob */
379: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
380: key->type = KEY_RSA1;
381: return (ret);
382: }
383:
384: int
385: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
386: {
387: Buffer m;
388: u_char *blob;
389: u_int len;
1.22 markus 390: int allowed = 0, have_forced = 0;
1.1 provos 391:
1.8 markus 392: debug3("%s entering", __func__);
1.1 provos 393:
394: /* Convert the key to a blob and the pass it over */
395: if (!key_to_blob(key, &blob, &len))
396: return (0);
397:
398: buffer_init(&m);
399: buffer_put_int(&m, type);
400: buffer_put_cstring(&m, user ? user : "");
401: buffer_put_cstring(&m, host ? host : "");
402: buffer_put_string(&m, blob, len);
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
429: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
430: {
431: Buffer m;
432: u_char *blob;
433: u_int len;
434: int verified = 0;
435:
1.8 markus 436: debug3("%s entering", __func__);
1.1 provos 437:
438: /* Convert the key to a blob and the pass it over */
439: if (!key_to_blob(key, &blob, &len))
440: return (0);
441:
442: buffer_init(&m);
443: buffer_put_string(&m, blob, len);
444: buffer_put_string(&m, sig, siglen);
445: buffer_put_string(&m, data, datalen);
1.76 djm 446: free(blob);
1.1 provos 447:
1.7 mouring 448: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 449:
1.8 markus 450: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 451: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 452:
453: verified = buffer_get_int(&m);
454:
455: buffer_free(&m);
456:
457: return (verified);
458: }
459:
460: void
1.36 avsm 461: mm_send_keystate(struct monitor *monitor)
1.1 provos 462: {
1.82 markus 463: struct ssh *ssh = active_state; /* XXX */
464: struct sshbuf *m;
465: int r;
466:
467: if ((m = sshbuf_new()) == NULL)
468: fatal("%s: sshbuf_new failed", __func__);
469: if ((r = ssh_packet_get_state(ssh, m)) != 0)
470: fatal("%s: get_state failed: %s",
471: __func__, ssh_err(r));
472: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 473: debug3("%s: Finished sending state", __func__);
1.82 markus 474: sshbuf_free(m);
1.1 provos 475: }
476:
477: int
1.42 deraadt 478: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 479: {
480: Buffer m;
1.39 dtucker 481: char *p, *msg;
1.62 djm 482: int success = 0, tmp1 = -1, tmp2 = -1;
483:
484: /* Kludge: ensure there are fds free to receive the pty/tty */
485: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
486: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
487: error("%s: cannot allocate fds for pty", __func__);
488: if (tmp1 > 0)
489: close(tmp1);
490: if (tmp2 > 0)
491: close(tmp2);
492: return 0;
493: }
494: close(tmp1);
495: close(tmp2);
1.1 provos 496:
497: buffer_init(&m);
1.7 mouring 498: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 499:
1.8 markus 500: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 501: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 502:
503: success = buffer_get_int(&m);
504: if (success == 0) {
1.8 markus 505: debug3("%s: pty alloc failed", __func__);
1.1 provos 506: buffer_free(&m);
507: return (0);
508: }
509: p = buffer_get_string(&m, NULL);
1.39 dtucker 510: msg = buffer_get_string(&m, NULL);
1.1 provos 511: buffer_free(&m);
512:
513: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 514: free(p);
1.39 dtucker 515:
516: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 517: free(msg);
1.1 provos 518:
1.58 djm 519: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
520: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
521: fatal("%s: receive fds failed", __func__);
1.1 provos 522:
523: /* Success */
524: return (1);
525: }
526:
527: void
1.32 markus 528: mm_session_pty_cleanup2(Session *s)
1.1 provos 529: {
530: Buffer m;
531:
532: if (s->ttyfd == -1)
533: return;
534: buffer_init(&m);
535: buffer_put_cstring(&m, s->tty);
1.7 mouring 536: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 537: buffer_free(&m);
1.3 markus 538:
1.1 provos 539: /* closed dup'ed master */
1.62 djm 540: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
541: error("close(s->ptymaster/%d): %s",
542: s->ptymaster, strerror(errno));
1.1 provos 543:
544: /* unlink pty from session */
545: s->ttyfd = -1;
546: }
547:
548: /* Request process termination */
549:
550: void
551: mm_terminate(void)
552: {
553: Buffer m;
554:
555: buffer_init(&m);
1.7 mouring 556: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 557: buffer_free(&m);
558: }
559:
1.80 markus 560: #ifdef WITH_SSH1
1.1 provos 561: int
562: mm_ssh1_session_key(BIGNUM *num)
563: {
564: int rsafail;
565: Buffer m;
566:
567: buffer_init(&m);
568: buffer_put_bignum2(&m, num);
1.7 mouring 569: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 570:
1.7 mouring 571: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 572:
573: rsafail = buffer_get_int(&m);
574: buffer_get_bignum2(&m, num);
575:
576: buffer_free(&m);
577:
578: return (rsafail);
579: }
1.80 markus 580: #endif
1.1 provos 581:
1.2 markus 582: static void
1.1 provos 583: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
584: char ***prompts, u_int **echo_on)
585: {
1.10 deraadt 586: *name = xstrdup("");
587: *infotxt = xstrdup("");
1.1 provos 588: *numprompts = 1;
1.43 djm 589: *prompts = xcalloc(*numprompts, sizeof(char *));
590: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 591: (*echo_on)[0] = 0;
592: }
593:
594: int
595: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
596: u_int *numprompts, char ***prompts, u_int **echo_on)
597: {
598: Buffer m;
1.21 markus 599: u_int success;
1.1 provos 600: char *challenge;
601:
1.8 markus 602: debug3("%s: entering", __func__);
1.1 provos 603:
604: buffer_init(&m);
1.7 mouring 605: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 606:
1.7 mouring 607: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 608: &m);
1.21 markus 609: success = buffer_get_int(&m);
610: if (success == 0) {
1.8 markus 611: debug3("%s: no challenge", __func__);
1.1 provos 612: buffer_free(&m);
613: return (-1);
614: }
615:
616: /* Get the challenge, and format the response */
617: challenge = buffer_get_string(&m, NULL);
618: buffer_free(&m);
619:
620: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
621: (*prompts)[0] = challenge;
622:
1.8 markus 623: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 624:
625: return (0);
626: }
627:
628: int
629: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
630: {
631: Buffer m;
632: int authok;
633:
1.8 markus 634: debug3("%s: entering", __func__);
1.1 provos 635: if (numresponses != 1)
636: return (-1);
637:
638: buffer_init(&m);
639: buffer_put_cstring(&m, responses[0]);
1.7 mouring 640: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 641:
1.7 mouring 642: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 643: MONITOR_ANS_BSDAUTHRESPOND, &m);
644:
645: authok = buffer_get_int(&m);
646: buffer_free(&m);
647:
648: return ((authok == 0) ? -1 : 0);
649: }
650:
651:
652: void
653: mm_ssh1_session_id(u_char session_id[16])
654: {
655: Buffer m;
656: int i;
657:
1.8 markus 658: debug3("%s entering", __func__);
1.1 provos 659:
660: buffer_init(&m);
661: for (i = 0; i < 16; i++)
662: buffer_put_char(&m, session_id[i]);
663:
1.7 mouring 664: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 665: buffer_free(&m);
666: }
667:
1.80 markus 668: #ifdef WITH_SSH1
1.1 provos 669: int
670: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
671: {
672: Buffer m;
673: Key *key;
674: u_char *blob;
675: u_int blen;
1.22 markus 676: int allowed = 0, have_forced = 0;
1.1 provos 677:
1.8 markus 678: debug3("%s entering", __func__);
1.1 provos 679:
680: buffer_init(&m);
681: buffer_put_bignum2(&m, client_n);
682:
1.7 mouring 683: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
684: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 685:
686: allowed = buffer_get_int(&m);
1.22 markus 687:
688: /* fake forced command */
689: auth_clear_options();
690: have_forced = buffer_get_int(&m);
691: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 692:
693: if (allowed && rkey != NULL) {
694: blob = buffer_get_string(&m, &blen);
695: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 696: fatal("%s: key_from_blob failed", __func__);
1.1 provos 697: *rkey = key;
1.76 djm 698: free(blob);
1.1 provos 699: }
700: buffer_free(&m);
701:
702: return (allowed);
703: }
704:
705: BIGNUM *
706: mm_auth_rsa_generate_challenge(Key *key)
707: {
708: Buffer m;
709: BIGNUM *challenge;
710: u_char *blob;
711: u_int blen;
712:
1.8 markus 713: debug3("%s entering", __func__);
1.1 provos 714:
715: if ((challenge = BN_new()) == NULL)
1.8 markus 716: fatal("%s: BN_new failed", __func__);
1.1 provos 717:
718: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
719: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 720: fatal("%s: key_to_blob failed", __func__);
1.1 provos 721: key->type = KEY_RSA1;
722:
723: buffer_init(&m);
724: buffer_put_string(&m, blob, blen);
1.76 djm 725: free(blob);
1.1 provos 726:
1.7 mouring 727: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
728: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 729:
730: buffer_get_bignum2(&m, challenge);
731: buffer_free(&m);
732:
733: return (challenge);
734: }
735:
736: int
737: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
738: {
739: Buffer m;
740: u_char *blob;
741: u_int blen;
742: int success = 0;
743:
1.8 markus 744: debug3("%s entering", __func__);
1.1 provos 745:
746: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
747: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 748: fatal("%s: key_to_blob failed", __func__);
1.1 provos 749: key->type = KEY_RSA1;
750:
751: buffer_init(&m);
752: buffer_put_string(&m, blob, blen);
753: buffer_put_string(&m, response, 16);
1.76 djm 754: free(blob);
1.1 provos 755:
1.7 mouring 756: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
757: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 758:
759: success = buffer_get_int(&m);
760: buffer_free(&m);
761:
762: return (success);
763: }
1.80 markus 764: #endif
1.29 markus 765:
766: #ifdef GSSAPI
767: OM_uint32
1.36 avsm 768: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 769: {
770: Buffer m;
771: OM_uint32 major;
772:
773: /* Client doesn't get to see the context */
774: *ctx = NULL;
775:
776: buffer_init(&m);
1.36 avsm 777: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 778:
779: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
780: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
781:
782: major = buffer_get_int(&m);
783:
784: buffer_free(&m);
785: return (major);
786: }
787:
788: OM_uint32
789: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
790: gss_buffer_desc *out, OM_uint32 *flags)
791: {
792: Buffer m;
793: OM_uint32 major;
1.30 deraadt 794: u_int len;
1.29 markus 795:
796: buffer_init(&m);
797: buffer_put_string(&m, in->value, in->length);
798:
799: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
800: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
801:
802: major = buffer_get_int(&m);
1.30 deraadt 803: out->value = buffer_get_string(&m, &len);
804: out->length = len;
1.29 markus 805: if (flags)
806: *flags = buffer_get_int(&m);
807:
808: buffer_free(&m);
809:
810: return (major);
1.35 markus 811: }
812:
813: OM_uint32
814: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
815: {
816: Buffer m;
817: OM_uint32 major;
818:
819: buffer_init(&m);
820: buffer_put_string(&m, gssbuf->value, gssbuf->length);
821: buffer_put_string(&m, gssmic->value, gssmic->length);
822:
823: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
824: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
825: &m);
826:
827: major = buffer_get_int(&m);
828: buffer_free(&m);
829: return(major);
1.29 markus 830: }
831:
832: int
833: mm_ssh_gssapi_userok(char *user)
834: {
835: Buffer m;
836: int authenticated = 0;
837:
838: buffer_init(&m);
839:
840: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
841: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
842: &m);
843:
844: authenticated = buffer_get_int(&m);
845:
846: buffer_free(&m);
847: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
848: return (authenticated);
849: }
850: #endif /* GSSAPI */
1.64 djm 851:
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