Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.86
1.86 ! markus 1: /* $OpenBSD: monitor_wrap.c,v 1.85 2015/05/01 03:23:51 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"
1.70 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,
1.86 ! markus 211: const u_char *data, u_int datalen, const char *hostkey_alg)
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);
1.86 ! markus 221: buffer_put_cstring(&m, hostkey_alg);
1.1 provos 222:
1.7 mouring 223: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
1.1 provos 224:
1.8 markus 225: debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
1.7 mouring 226: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
1.1 provos 227: *sigp = buffer_get_string(&m, lenp);
228: buffer_free(&m);
229:
230: return (0);
231: }
232:
233: struct passwd *
1.37 dtucker 234: mm_getpwnamallow(const char *username)
1.1 provos 235: {
236: Buffer m;
237: struct passwd *pw;
1.72 djm 238: u_int len, i;
1.55 dtucker 239: ServerOptions *newopts;
1.1 provos 240:
1.8 markus 241: debug3("%s entering", __func__);
1.1 provos 242:
243: buffer_init(&m);
1.37 dtucker 244: buffer_put_cstring(&m, username);
1.1 provos 245:
1.7 mouring 246: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
1.1 provos 247:
1.8 markus 248: debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
1.7 mouring 249: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
1.1 provos 250:
251: if (buffer_get_char(&m) == 0) {
1.60 dtucker 252: pw = NULL;
253: goto out;
1.1 provos 254: }
1.55 dtucker 255: pw = buffer_get_string(&m, &len);
256: if (len != sizeof(struct passwd))
1.8 markus 257: fatal("%s: struct passwd size mismatch", __func__);
1.1 provos 258: pw->pw_name = buffer_get_string(&m, NULL);
259: pw->pw_passwd = buffer_get_string(&m, NULL);
260: pw->pw_gecos = buffer_get_string(&m, NULL);
261: pw->pw_class = buffer_get_string(&m, NULL);
262: pw->pw_dir = buffer_get_string(&m, NULL);
263: pw->pw_shell = buffer_get_string(&m, NULL);
1.55 dtucker 264:
1.60 dtucker 265: out:
1.55 dtucker 266: /* copy options block as a Match directive may have changed some */
267: newopts = buffer_get_string(&m, &len);
268: if (len != sizeof(*newopts))
269: fatal("%s: option block size mismatch", __func__);
1.71 djm 270:
271: #define M_CP_STROPT(x) do { \
272: if (newopts->x != NULL) \
273: newopts->x = buffer_get_string(&m, NULL); \
274: } while (0)
1.72 djm 275: #define M_CP_STRARRAYOPT(x, nx) do { \
276: for (i = 0; i < newopts->nx; i++) \
277: newopts->x[i] = buffer_get_string(&m, NULL); \
278: } while (0)
1.71 djm 279: /* See comment in servconf.h */
280: COPY_MATCH_STRING_OPTS();
281: #undef M_CP_STROPT
1.72 djm 282: #undef M_CP_STRARRAYOPT
1.71 djm 283:
1.55 dtucker 284: copy_set_server_options(&options, newopts, 1);
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
337: mm_auth_password(Authctxt *authctxt, char *password)
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
1.85 djm 361: mm_user_key_allowed(struct passwd *pw, Key *key, int pubkey_auth_attempt)
1.1 provos 362: {
1.85 djm 363: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
364: pubkey_auth_attempt));
1.1 provos 365: }
366:
367: int
368: mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
369: Key *key)
370: {
1.85 djm 371: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0));
1.1 provos 372: }
373:
374: int
375: mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
376: char *host, Key *key)
377: {
378: int ret;
379:
380: key->type = KEY_RSA; /* XXX hack for key_to_blob */
1.85 djm 381: ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key, 0);
1.1 provos 382: key->type = KEY_RSA1;
383: return (ret);
384: }
385:
386: int
1.85 djm 387: mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key,
388: int pubkey_auth_attempt)
1.1 provos 389: {
390: Buffer m;
391: u_char *blob;
392: u_int len;
1.22 markus 393: int allowed = 0, have_forced = 0;
1.1 provos 394:
1.8 markus 395: debug3("%s entering", __func__);
1.1 provos 396:
397: /* Convert the key to a blob and the pass it over */
398: if (!key_to_blob(key, &blob, &len))
399: return (0);
400:
401: buffer_init(&m);
402: buffer_put_int(&m, type);
403: buffer_put_cstring(&m, user ? user : "");
404: buffer_put_cstring(&m, host ? host : "");
405: buffer_put_string(&m, blob, len);
1.85 djm 406: buffer_put_int(&m, pubkey_auth_attempt);
1.76 djm 407: free(blob);
1.1 provos 408:
1.7 mouring 409: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 410:
1.8 markus 411: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 412: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 413:
414: allowed = buffer_get_int(&m);
415:
1.22 markus 416: /* fake forced command */
417: auth_clear_options();
418: have_forced = buffer_get_int(&m);
419: forced_command = have_forced ? xstrdup("true") : NULL;
420:
1.1 provos 421: buffer_free(&m);
422:
423: return (allowed);
424: }
425:
1.3 markus 426: /*
1.1 provos 427: * This key verify needs to send the key type along, because the
428: * privileged parent makes the decision if the key is allowed
429: * for authentication.
430: */
431:
432: int
433: mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
434: {
435: Buffer m;
436: u_char *blob;
437: u_int len;
438: int verified = 0;
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);
1.76 djm 450: free(blob);
1.1 provos 451:
1.7 mouring 452: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 453:
1.8 markus 454: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 455: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 456:
457: verified = buffer_get_int(&m);
458:
459: buffer_free(&m);
460:
461: return (verified);
462: }
463:
464: void
1.36 avsm 465: mm_send_keystate(struct monitor *monitor)
1.1 provos 466: {
1.82 markus 467: struct ssh *ssh = active_state; /* XXX */
468: struct sshbuf *m;
469: int r;
470:
471: if ((m = sshbuf_new()) == NULL)
472: fatal("%s: sshbuf_new failed", __func__);
473: if ((r = ssh_packet_get_state(ssh, m)) != 0)
474: fatal("%s: get_state failed: %s",
475: __func__, ssh_err(r));
476: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 477: debug3("%s: Finished sending state", __func__);
1.82 markus 478: sshbuf_free(m);
1.1 provos 479: }
480:
481: int
1.42 deraadt 482: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 483: {
484: Buffer m;
1.39 dtucker 485: char *p, *msg;
1.62 djm 486: int success = 0, tmp1 = -1, tmp2 = -1;
487:
488: /* Kludge: ensure there are fds free to receive the pty/tty */
489: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
490: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
491: error("%s: cannot allocate fds for pty", __func__);
492: if (tmp1 > 0)
493: close(tmp1);
494: if (tmp2 > 0)
495: close(tmp2);
496: return 0;
497: }
498: close(tmp1);
499: close(tmp2);
1.1 provos 500:
501: buffer_init(&m);
1.7 mouring 502: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 503:
1.8 markus 504: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 505: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 506:
507: success = buffer_get_int(&m);
508: if (success == 0) {
1.8 markus 509: debug3("%s: pty alloc failed", __func__);
1.1 provos 510: buffer_free(&m);
511: return (0);
512: }
513: p = buffer_get_string(&m, NULL);
1.39 dtucker 514: msg = buffer_get_string(&m, NULL);
1.1 provos 515: buffer_free(&m);
516:
517: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 518: free(p);
1.39 dtucker 519:
520: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 521: free(msg);
1.1 provos 522:
1.58 djm 523: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
524: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
525: fatal("%s: receive fds failed", __func__);
1.1 provos 526:
527: /* Success */
528: return (1);
529: }
530:
531: void
1.32 markus 532: mm_session_pty_cleanup2(Session *s)
1.1 provos 533: {
534: Buffer m;
535:
536: if (s->ttyfd == -1)
537: return;
538: buffer_init(&m);
539: buffer_put_cstring(&m, s->tty);
1.7 mouring 540: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 541: buffer_free(&m);
1.3 markus 542:
1.1 provos 543: /* closed dup'ed master */
1.62 djm 544: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
545: error("close(s->ptymaster/%d): %s",
546: s->ptymaster, strerror(errno));
1.1 provos 547:
548: /* unlink pty from session */
549: s->ttyfd = -1;
550: }
551:
552: /* Request process termination */
553:
554: void
555: mm_terminate(void)
556: {
557: Buffer m;
558:
559: buffer_init(&m);
1.7 mouring 560: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 561: buffer_free(&m);
562: }
563:
1.80 markus 564: #ifdef WITH_SSH1
1.1 provos 565: int
566: mm_ssh1_session_key(BIGNUM *num)
567: {
568: int rsafail;
569: Buffer m;
570:
571: buffer_init(&m);
572: buffer_put_bignum2(&m, num);
1.7 mouring 573: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);
1.1 provos 574:
1.7 mouring 575: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);
1.1 provos 576:
577: rsafail = buffer_get_int(&m);
578: buffer_get_bignum2(&m, num);
579:
580: buffer_free(&m);
581:
582: return (rsafail);
583: }
1.80 markus 584: #endif
1.1 provos 585:
1.2 markus 586: static void
1.1 provos 587: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
588: char ***prompts, u_int **echo_on)
589: {
1.10 deraadt 590: *name = xstrdup("");
591: *infotxt = xstrdup("");
1.1 provos 592: *numprompts = 1;
1.43 djm 593: *prompts = xcalloc(*numprompts, sizeof(char *));
594: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 595: (*echo_on)[0] = 0;
596: }
597:
598: int
599: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
600: u_int *numprompts, char ***prompts, u_int **echo_on)
601: {
602: Buffer m;
1.21 markus 603: u_int success;
1.1 provos 604: char *challenge;
605:
1.8 markus 606: debug3("%s: entering", __func__);
1.1 provos 607:
608: buffer_init(&m);
1.7 mouring 609: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 610:
1.7 mouring 611: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 612: &m);
1.21 markus 613: success = buffer_get_int(&m);
614: if (success == 0) {
1.8 markus 615: debug3("%s: no challenge", __func__);
1.1 provos 616: buffer_free(&m);
617: return (-1);
618: }
619:
620: /* Get the challenge, and format the response */
621: challenge = buffer_get_string(&m, NULL);
622: buffer_free(&m);
623:
624: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
625: (*prompts)[0] = challenge;
626:
1.8 markus 627: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 628:
629: return (0);
630: }
631:
632: int
633: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
634: {
635: Buffer m;
636: int authok;
637:
1.8 markus 638: debug3("%s: entering", __func__);
1.1 provos 639: if (numresponses != 1)
640: return (-1);
641:
642: buffer_init(&m);
643: buffer_put_cstring(&m, responses[0]);
1.7 mouring 644: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 645:
1.7 mouring 646: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 647: MONITOR_ANS_BSDAUTHRESPOND, &m);
648:
649: authok = buffer_get_int(&m);
650: buffer_free(&m);
651:
652: return ((authok == 0) ? -1 : 0);
653: }
654:
655:
656: void
657: mm_ssh1_session_id(u_char session_id[16])
658: {
659: Buffer m;
660: int i;
661:
1.8 markus 662: debug3("%s entering", __func__);
1.1 provos 663:
664: buffer_init(&m);
665: for (i = 0; i < 16; i++)
666: buffer_put_char(&m, session_id[i]);
667:
1.7 mouring 668: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
1.1 provos 669: buffer_free(&m);
670: }
671:
1.80 markus 672: #ifdef WITH_SSH1
1.1 provos 673: int
674: mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey)
675: {
676: Buffer m;
677: Key *key;
678: u_char *blob;
679: u_int blen;
1.22 markus 680: int allowed = 0, have_forced = 0;
1.1 provos 681:
1.8 markus 682: debug3("%s entering", __func__);
1.1 provos 683:
684: buffer_init(&m);
685: buffer_put_bignum2(&m, client_n);
686:
1.7 mouring 687: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
688: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);
1.1 provos 689:
690: allowed = buffer_get_int(&m);
1.22 markus 691:
692: /* fake forced command */
693: auth_clear_options();
694: have_forced = buffer_get_int(&m);
695: forced_command = have_forced ? xstrdup("true") : NULL;
1.1 provos 696:
697: if (allowed && rkey != NULL) {
698: blob = buffer_get_string(&m, &blen);
699: if ((key = key_from_blob(blob, blen)) == NULL)
1.8 markus 700: fatal("%s: key_from_blob failed", __func__);
1.1 provos 701: *rkey = key;
1.76 djm 702: free(blob);
1.1 provos 703: }
704: buffer_free(&m);
705:
706: return (allowed);
707: }
708:
709: BIGNUM *
710: mm_auth_rsa_generate_challenge(Key *key)
711: {
712: Buffer m;
713: BIGNUM *challenge;
714: u_char *blob;
715: u_int blen;
716:
1.8 markus 717: debug3("%s entering", __func__);
1.1 provos 718:
719: if ((challenge = BN_new()) == NULL)
1.8 markus 720: fatal("%s: BN_new failed", __func__);
1.1 provos 721:
722: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
723: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 724: fatal("%s: key_to_blob failed", __func__);
1.1 provos 725: key->type = KEY_RSA1;
726:
727: buffer_init(&m);
728: buffer_put_string(&m, blob, blen);
1.76 djm 729: free(blob);
1.1 provos 730:
1.7 mouring 731: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
732: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);
1.1 provos 733:
734: buffer_get_bignum2(&m, challenge);
735: buffer_free(&m);
736:
737: return (challenge);
738: }
739:
740: int
741: mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16])
742: {
743: Buffer m;
744: u_char *blob;
745: u_int blen;
746: int success = 0;
747:
1.8 markus 748: debug3("%s entering", __func__);
1.1 provos 749:
750: key->type = KEY_RSA; /* XXX cheat for key_to_blob */
751: if (key_to_blob(key, &blob, &blen) == 0)
1.8 markus 752: fatal("%s: key_to_blob failed", __func__);
1.1 provos 753: key->type = KEY_RSA1;
754:
755: buffer_init(&m);
756: buffer_put_string(&m, blob, blen);
757: buffer_put_string(&m, response, 16);
1.76 djm 758: free(blob);
1.1 provos 759:
1.7 mouring 760: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
761: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);
1.1 provos 762:
763: success = buffer_get_int(&m);
764: buffer_free(&m);
765:
766: return (success);
767: }
1.80 markus 768: #endif
1.29 markus 769:
770: #ifdef GSSAPI
771: OM_uint32
1.36 avsm 772: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 773: {
774: Buffer m;
775: OM_uint32 major;
776:
777: /* Client doesn't get to see the context */
778: *ctx = NULL;
779:
780: buffer_init(&m);
1.36 avsm 781: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 782:
783: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
784: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
785:
786: major = buffer_get_int(&m);
787:
788: buffer_free(&m);
789: return (major);
790: }
791:
792: OM_uint32
793: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
794: gss_buffer_desc *out, OM_uint32 *flags)
795: {
796: Buffer m;
797: OM_uint32 major;
1.30 deraadt 798: u_int len;
1.29 markus 799:
800: buffer_init(&m);
801: buffer_put_string(&m, in->value, in->length);
802:
803: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
804: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
805:
806: major = buffer_get_int(&m);
1.30 deraadt 807: out->value = buffer_get_string(&m, &len);
808: out->length = len;
1.29 markus 809: if (flags)
810: *flags = buffer_get_int(&m);
811:
812: buffer_free(&m);
813:
814: return (major);
1.35 markus 815: }
816:
817: OM_uint32
818: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
819: {
820: Buffer m;
821: OM_uint32 major;
822:
823: buffer_init(&m);
824: buffer_put_string(&m, gssbuf->value, gssbuf->length);
825: buffer_put_string(&m, gssmic->value, gssmic->length);
826:
827: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
828: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
829: &m);
830:
831: major = buffer_get_int(&m);
832: buffer_free(&m);
833: return(major);
1.29 markus 834: }
835:
836: int
837: mm_ssh_gssapi_userok(char *user)
838: {
839: Buffer m;
840: int authenticated = 0;
841:
842: buffer_init(&m);
843:
844: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
845: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
846: &m);
847:
848: authenticated = buffer_get_int(&m);
849:
850: buffer_free(&m);
851: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
852: return (authenticated);
853: }
854: #endif /* GSSAPI */
1.64 djm 855:
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