Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.82
1.82 ! markus 1: /* $OpenBSD: monitor_wrap.c,v 1.81 2015/01/13 19:31:40 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
210: mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
211: {
1.7 mouring 212: Kex *kex = *pmonitor->m_pkex;
1.1 provos 213: Buffer m;
214:
1.8 markus 215: debug3("%s entering", __func__);
1.1 provos 216:
217: buffer_init(&m);
218: buffer_put_int(&m, kex->host_key_index(key));
219: buffer_put_string(&m, data, datalen);
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: {
234: Buffer m;
235: struct passwd *pw;
1.72 djm 236: u_int len, i;
1.55 dtucker 237: ServerOptions *newopts;
1.1 provos 238:
1.8 markus 239: debug3("%s entering", __func__);
1.1 provos 240:
241: buffer_init(&m);
1.37 dtucker 242: buffer_put_cstring(&m, username);
1.1 provos 243:
1.7 mouring 244: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 245:
1.8 markus 246: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 247: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 248:
249: if (buffer_get_char(&m) == 0) {
1.60 dtucker 250: pw = NULL;
251: goto out;
1.1 provos 252: }
1.55 dtucker 253: pw = buffer_get_string(&m, &len);
254: if (len != sizeof(struct passwd))
1.8 markus 255: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 256: pw->pw_name = buffer_get_string(&m, NULL);
257: pw->pw_passwd = buffer_get_string(&m, NULL);
258: pw->pw_gecos = buffer_get_string(&m, NULL);
259: pw->pw_class = buffer_get_string(&m, NULL);
260: pw->pw_dir = buffer_get_string(&m, NULL);
261: pw->pw_shell = buffer_get_string(&m, NULL);
1.55 dtucker 262:
1.60 dtucker 263: out:
1.55 dtucker 264: /* copy options block as a Match directive may have changed some */
265: newopts = buffer_get_string(&m, &len);
266: if (len != sizeof(*newopts))
267: fatal("%s: option block size mismatch", __func__);
1.71 djm 268:
269: #define M_CP_STROPT(x) do { \
270: if (newopts->x != NULL) \
271: newopts->x = buffer_get_string(&m, NULL); \
272: } while (0)
1.72 djm 273: #define M_CP_STRARRAYOPT(x, nx) do { \
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);
1.76 djm 283: free(newopts);
1.55 dtucker 284:
1.1 provos 285: buffer_free(&m);
286:
287: return (pw);
1.6 djm 288: }
289:
1.33 markus 290: char *
291: mm_auth2_read_banner(void)
1.6 djm 292: {
293: Buffer m;
294: char *banner;
295:
1.8 markus 296: debug3("%s entering", __func__);
1.6 djm 297:
298: buffer_init(&m);
1.7 mouring 299: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 300: buffer_clear(&m);
301:
1.33 markus 302: mm_request_receive_expect(pmonitor->m_recvfd,
303: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 304: banner = buffer_get_string(&m, NULL);
305: buffer_free(&m);
1.10 deraadt 306:
1.33 markus 307: /* treat empty banner as missing banner */
308: if (strlen(banner) == 0) {
1.76 djm 309: free(banner);
1.33 markus 310: banner = NULL;
311: }
1.6 djm 312: return (banner);
1.1 provos 313: }
314:
315: /* Inform the privileged process about service and style */
316:
317: void
318: mm_inform_authserv(char *service, char *style)
319: {
320: Buffer m;
321:
1.8 markus 322: debug3("%s entering", __func__);
1.1 provos 323:
324: buffer_init(&m);
325: buffer_put_cstring(&m, service);
326: buffer_put_cstring(&m, style ? style : "");
327:
1.7 mouring 328: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 329:
330: buffer_free(&m);
331: }
332:
333: /* Do the password authentication */
334: int
335: mm_auth_password(Authctxt *authctxt, char *password)
336: {
337: Buffer m;
338: int authenticated = 0;
339:
1.8 markus 340: debug3("%s entering", __func__);
1.1 provos 341:
342: buffer_init(&m);
343: buffer_put_cstring(&m, password);
1.7 mouring 344: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 345:
1.8 markus 346: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 347: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 348:
349: authenticated = buffer_get_int(&m);
350:
351: buffer_free(&m);
352:
1.3 markus 353: debug3("%s: user %sauthenticated",
1.8 markus 354: __func__, authenticated ? "" : "not ");
1.1 provos 355: return (authenticated);
356: }
357:
358: int
359: mm_user_key_allowed(struct passwd *pw, Key *key)
360: {
361: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
362: }
363:
364: int
365: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
366: Key *key)
367: {
368: return (mm_key_allowed(MM_HOSTKEY, user, host, key));
369: }
370:
371: int
372: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
373: char *host, Key *key)
374: {
375: int ret;
376:
377: key->type = KEY_RSA; /* XXX hack for key_to_blob */
378: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
379: key->type = KEY_RSA1;
380: return (ret);
381: }
382:
383: int
384: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
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);
1.76 djm 402: free(blob);
1.1 provos 403:
1.7 mouring 404: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 405:
1.8 markus 406: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 407: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 408:
409: allowed = buffer_get_int(&m);
410:
1.22 markus 411: /* fake forced command */
412: auth_clear_options();
413: have_forced = buffer_get_int(&m);
414: forced_command = have_forced ? xstrdup("true") : NULL;
415:
1.1 provos 416: buffer_free(&m);
417:
418: return (allowed);
419: }
420:
1.3 markus 421: /*
1.1 provos 422: * This key verify needs to send the key type along, because the
423: * privileged parent makes the decision if the key is allowed
424: * for authentication.
425: */
426:
427: int
428: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
429: {
430: Buffer m;
431: u_char *blob;
432: u_int len;
433: int verified = 0;
434:
1.8 markus 435: debug3("%s entering", __func__);
1.1 provos 436:
437: /* Convert the key to a blob and the pass it over */
438: if (!key_to_blob(key, &blob, &len))
439: return (0);
440:
441: buffer_init(&m);
442: buffer_put_string(&m, blob, len);
443: buffer_put_string(&m, sig, siglen);
444: buffer_put_string(&m, data, datalen);
1.76 djm 445: free(blob);
1.1 provos 446:
1.7 mouring 447: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 448:
1.8 markus 449: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 450: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 451:
452: verified = buffer_get_int(&m);
453:
454: buffer_free(&m);
455:
456: return (verified);
457: }
458:
459: void
1.36 avsm 460: mm_send_keystate(struct monitor *monitor)
1.1 provos 461: {
1.82 ! markus 462: struct ssh *ssh = active_state; /* XXX */
! 463: struct sshbuf *m;
! 464: int r;
! 465:
! 466: if ((m = sshbuf_new()) == NULL)
! 467: fatal("%s: sshbuf_new failed", __func__);
! 468: if ((r = ssh_packet_get_state(ssh, m)) != 0)
! 469: fatal("%s: get_state failed: %s",
! 470: __func__, ssh_err(r));
! 471: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 472: debug3("%s: Finished sending state", __func__);
1.82 ! markus 473: sshbuf_free(m);
1.1 provos 474: }
475:
476: int
1.42 deraadt 477: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 478: {
479: Buffer m;
1.39 dtucker 480: char *p, *msg;
1.62 djm 481: int success = 0, tmp1 = -1, tmp2 = -1;
482:
483: /* Kludge: ensure there are fds free to receive the pty/tty */
484: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
485: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
486: error("%s: cannot allocate fds for pty", __func__);
487: if (tmp1 > 0)
488: close(tmp1);
489: if (tmp2 > 0)
490: close(tmp2);
491: return 0;
492: }
493: close(tmp1);
494: close(tmp2);
1.1 provos 495:
496: buffer_init(&m);
1.7 mouring 497: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 498:
1.8 markus 499: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 500: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 501:
502: success = buffer_get_int(&m);
503: if (success == 0) {
1.8 markus 504: debug3("%s: pty alloc failed", __func__);
1.1 provos 505: buffer_free(&m);
506: return (0);
507: }
508: p = buffer_get_string(&m, NULL);
1.39 dtucker 509: msg = buffer_get_string(&m, NULL);
1.1 provos 510: buffer_free(&m);
511:
512: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 513: free(p);
1.39 dtucker 514:
515: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 516: free(msg);
1.1 provos 517:
1.58 djm 518: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
519: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
520: fatal("%s: receive fds failed", __func__);
1.1 provos 521:
522: /* Success */
523: return (1);
524: }
525:
526: void
1.32 markus 527: mm_session_pty_cleanup2(Session *s)
1.1 provos 528: {
529: Buffer m;
530:
531: if (s->ttyfd == -1)
532: return;
533: buffer_init(&m);
534: buffer_put_cstring(&m, s->tty);
1.7 mouring 535: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 536: buffer_free(&m);
1.3 markus 537:
1.1 provos 538: /* closed dup'ed master */
1.62 djm 539: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
540: error("close(s->ptymaster/%d): %s",
541: s->ptymaster, strerror(errno));
1.1 provos 542:
543: /* unlink pty from session */
544: s->ttyfd = -1;
545: }
546:
547: /* Request process termination */
548:
549: void
550: mm_terminate(void)
551: {
552: Buffer m;
553:
554: buffer_init(&m);
1.7 mouring 555: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 556: buffer_free(&m);
557: }
558:
1.80 markus 559: #ifdef WITH_SSH1
1.1 provos 560: int
561: mm_ssh1_session_key(BIGNUM *num)
562: {
563: int rsafail;
564: Buffer m;
565:
566: buffer_init(&m);
567: buffer_put_bignum2(&m, num);
1.7 mouring 568: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 569:
1.7 mouring 570: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 571:
572: rsafail = buffer_get_int(&m);
573: buffer_get_bignum2(&m, num);
574:
575: buffer_free(&m);
576:
577: return (rsafail);
578: }
1.80 markus 579: #endif
1.1 provos 580:
1.2 markus 581: static void
1.1 provos 582: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
583: char ***prompts, u_int **echo_on)
584: {
1.10 deraadt 585: *name = xstrdup("");
586: *infotxt = xstrdup("");
1.1 provos 587: *numprompts = 1;
1.43 djm 588: *prompts = xcalloc(*numprompts, sizeof(char *));
589: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 590: (*echo_on)[0] = 0;
591: }
592:
593: int
594: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
595: u_int *numprompts, char ***prompts, u_int **echo_on)
596: {
597: Buffer m;
1.21 markus 598: u_int success;
1.1 provos 599: char *challenge;
600:
1.8 markus 601: debug3("%s: entering", __func__);
1.1 provos 602:
603: buffer_init(&m);
1.7 mouring 604: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 605:
1.7 mouring 606: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 607: &m);
1.21 markus 608: success = buffer_get_int(&m);
609: if (success == 0) {
1.8 markus 610: debug3("%s: no challenge", __func__);
1.1 provos 611: buffer_free(&m);
612: return (-1);
613: }
614:
615: /* Get the challenge, and format the response */
616: challenge = buffer_get_string(&m, NULL);
617: buffer_free(&m);
618:
619: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
620: (*prompts)[0] = challenge;
621:
1.8 markus 622: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 623:
624: return (0);
625: }
626:
627: int
628: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
629: {
630: Buffer m;
631: int authok;
632:
1.8 markus 633: debug3("%s: entering", __func__);
1.1 provos 634: if (numresponses != 1)
635: return (-1);
636:
637: buffer_init(&m);
638: buffer_put_cstring(&m, responses[0]);
1.7 mouring 639: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 640:
1.7 mouring 641: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 642: MONITOR_ANS_BSDAUTHRESPOND, &m);
643:
644: authok = buffer_get_int(&m);
645: buffer_free(&m);
646:
647: return ((authok == 0) ? -1 : 0);
648: }
649:
650:
651: void
652: mm_ssh1_session_id(u_char session_id[16])
653: {
654: Buffer m;
655: int i;
656:
1.8 markus 657: debug3("%s entering", __func__);
1.1 provos 658:
659: buffer_init(&m);
660: for (i = 0; i < 16; i++)
661: buffer_put_char(&m, session_id[i]);
662:
1.7 mouring 663: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 664: buffer_free(&m);
665: }
666:
1.80 markus 667: #ifdef WITH_SSH1
1.1 provos 668: int
669: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
670: {
671: Buffer m;
672: Key *key;
673: u_char *blob;
674: u_int blen;
1.22 markus 675: int allowed = 0, have_forced = 0;
1.1 provos 676:
1.8 markus 677: debug3("%s entering", __func__);
1.1 provos 678:
679: buffer_init(&m);
680: buffer_put_bignum2(&m, client_n);
681:
1.7 mouring 682: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
683: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 684:
685: allowed = buffer_get_int(&m);
1.22 markus 686:
687: /* fake forced command */
688: auth_clear_options();
689: have_forced = buffer_get_int(&m);
690: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 691:
692: if (allowed && rkey != NULL) {
693: blob = buffer_get_string(&m, &blen);
694: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 695: fatal("%s: key_from_blob failed", __func__);
1.1 provos 696: *rkey = key;
1.76 djm 697: free(blob);
1.1 provos 698: }
699: buffer_free(&m);
700:
701: return (allowed);
702: }
703:
704: BIGNUM *
705: mm_auth_rsa_generate_challenge(Key *key)
706: {
707: Buffer m;
708: BIGNUM *challenge;
709: u_char *blob;
710: u_int blen;
711:
1.8 markus 712: debug3("%s entering", __func__);
1.1 provos 713:
714: if ((challenge = BN_new()) == NULL)
1.8 markus 715: fatal("%s: BN_new failed", __func__);
1.1 provos 716:
717: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
718: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 719: fatal("%s: key_to_blob failed", __func__);
1.1 provos 720: key->type = KEY_RSA1;
721:
722: buffer_init(&m);
723: buffer_put_string(&m, blob, blen);
1.76 djm 724: free(blob);
1.1 provos 725:
1.7 mouring 726: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
727: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 728:
729: buffer_get_bignum2(&m, challenge);
730: buffer_free(&m);
731:
732: return (challenge);
733: }
734:
735: int
736: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
737: {
738: Buffer m;
739: u_char *blob;
740: u_int blen;
741: int success = 0;
742:
1.8 markus 743: debug3("%s entering", __func__);
1.1 provos 744:
745: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
746: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 747: fatal("%s: key_to_blob failed", __func__);
1.1 provos 748: key->type = KEY_RSA1;
749:
750: buffer_init(&m);
751: buffer_put_string(&m, blob, blen);
752: buffer_put_string(&m, response, 16);
1.76 djm 753: free(blob);
1.1 provos 754:
1.7 mouring 755: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
756: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 757:
758: success = buffer_get_int(&m);
759: buffer_free(&m);
760:
761: return (success);
762: }
1.80 markus 763: #endif
1.29 markus 764:
765: #ifdef GSSAPI
766: OM_uint32
1.36 avsm 767: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 768: {
769: Buffer m;
770: OM_uint32 major;
771:
772: /* Client doesn't get to see the context */
773: *ctx = NULL;
774:
775: buffer_init(&m);
1.36 avsm 776: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 777:
778: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
779: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
780:
781: major = buffer_get_int(&m);
782:
783: buffer_free(&m);
784: return (major);
785: }
786:
787: OM_uint32
788: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
789: gss_buffer_desc *out, OM_uint32 *flags)
790: {
791: Buffer m;
792: OM_uint32 major;
1.30 deraadt 793: u_int len;
1.29 markus 794:
795: buffer_init(&m);
796: buffer_put_string(&m, in->value, in->length);
797:
798: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
799: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
800:
801: major = buffer_get_int(&m);
1.30 deraadt 802: out->value = buffer_get_string(&m, &len);
803: out->length = len;
1.29 markus 804: if (flags)
805: *flags = buffer_get_int(&m);
806:
807: buffer_free(&m);
808:
809: return (major);
1.35 markus 810: }
811:
812: OM_uint32
813: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
814: {
815: Buffer m;
816: OM_uint32 major;
817:
818: buffer_init(&m);
819: buffer_put_string(&m, gssbuf->value, gssbuf->length);
820: buffer_put_string(&m, gssmic->value, gssmic->length);
821:
822: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
823: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
824: &m);
825:
826: major = buffer_get_int(&m);
827: buffer_free(&m);
828: return(major);
1.29 markus 829: }
830:
831: int
832: mm_ssh_gssapi_userok(char *user)
833: {
834: Buffer m;
835: int authenticated = 0;
836:
837: buffer_init(&m);
838:
839: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
840: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
841: &m);
842:
843: authenticated = buffer_get_int(&m);
844:
845: buffer_free(&m);
846: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
847: return (authenticated);
848: }
849: #endif /* GSSAPI */
1.64 djm 850:
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