Annotation of src/usr.bin/ssh/monitor_wrap.c, Revision 1.93
1.93 ! djm 1: /* $OpenBSD: monitor_wrap.c,v 1.92 2017/05/30 14:10:53 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"
1.29 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)
1.71 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);
1.90 djm 284: log_change_level(options.log_level);
1.93 ! djm 285: process_permitopen(ssh, &options);
1.76 djm 286: free(newopts);
1.55 dtucker 287:
1.1 provos 288: buffer_free(&m);
289:
290: return (pw);
1.6 djm 291: }
292:
1.33 markus 293: char *
294: mm_auth2_read_banner(void)
1.6 djm 295: {
296: Buffer m;
297: char *banner;
298:
1.8 markus 299: debug3("%s entering", __func__);
1.6 djm 300:
301: buffer_init(&m);
1.7 mouring 302: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
1.6 djm 303: buffer_clear(&m);
304:
1.33 markus 305: mm_request_receive_expect(pmonitor->m_recvfd,
306: MONITOR_ANS_AUTH2_READ_BANNER, &m);
1.6 djm 307: banner = buffer_get_string(&m, NULL);
308: buffer_free(&m);
1.10 deraadt 309:
1.33 markus 310: /* treat empty banner as missing banner */
311: if (strlen(banner) == 0) {
1.76 djm 312: free(banner);
1.33 markus 313: banner = NULL;
314: }
1.6 djm 315: return (banner);
1.1 provos 316: }
317:
318: /* Inform the privileged process about service and style */
319:
320: void
321: mm_inform_authserv(char *service, char *style)
322: {
323: Buffer m;
324:
1.8 markus 325: debug3("%s entering", __func__);
1.1 provos 326:
327: buffer_init(&m);
328: buffer_put_cstring(&m, service);
329: buffer_put_cstring(&m, style ? style : "");
330:
1.7 mouring 331: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
1.1 provos 332:
333: buffer_free(&m);
334: }
335:
336: /* Do the password authentication */
337: int
338: mm_auth_password(Authctxt *authctxt, char *password)
339: {
340: Buffer m;
341: int authenticated = 0;
342:
1.8 markus 343: debug3("%s entering", __func__);
1.1 provos 344:
345: buffer_init(&m);
346: buffer_put_cstring(&m, password);
1.7 mouring 347: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
1.1 provos 348:
1.8 markus 349: debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
1.7 mouring 350: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
1.1 provos 351:
352: authenticated = buffer_get_int(&m);
353:
354: buffer_free(&m);
355:
1.3 markus 356: debug3("%s: user %sauthenticated",
1.8 markus 357: __func__, authenticated ? "" : "not ");
1.1 provos 358: return (authenticated);
359: }
360:
361: int
1.91 markus 362: mm_user_key_allowed(struct passwd *pw, struct sshkey *key,
363: int pubkey_auth_attempt)
1.1 provos 364: {
1.85 djm 365: return (mm_key_allowed(MM_USERKEY, NULL, NULL, key,
366: pubkey_auth_attempt));
1.1 provos 367: }
368:
369: int
1.88 djm 370: mm_hostbased_key_allowed(struct passwd *pw, const char *user, const char *host,
1.91 markus 371: struct sshkey *key)
1.1 provos 372: {
1.85 djm 373: return (mm_key_allowed(MM_HOSTKEY, user, host, key, 0));
1.1 provos 374: }
375:
376: int
1.88 djm 377: mm_key_allowed(enum mm_keytype type, const char *user, const char *host,
1.91 markus 378: struct sshkey *key, int pubkey_auth_attempt)
1.1 provos 379: {
380: Buffer m;
381: u_char *blob;
382: u_int len;
1.22 markus 383: int allowed = 0, have_forced = 0;
1.1 provos 384:
1.8 markus 385: debug3("%s entering", __func__);
1.1 provos 386:
387: /* Convert the key to a blob and the pass it over */
388: if (!key_to_blob(key, &blob, &len))
389: return (0);
390:
391: buffer_init(&m);
392: buffer_put_int(&m, type);
393: buffer_put_cstring(&m, user ? user : "");
394: buffer_put_cstring(&m, host ? host : "");
395: buffer_put_string(&m, blob, len);
1.85 djm 396: buffer_put_int(&m, pubkey_auth_attempt);
1.76 djm 397: free(blob);
1.1 provos 398:
1.7 mouring 399: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
1.1 provos 400:
1.8 markus 401: debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
1.7 mouring 402: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
1.1 provos 403:
404: allowed = buffer_get_int(&m);
405:
1.22 markus 406: /* fake forced command */
407: auth_clear_options();
408: have_forced = buffer_get_int(&m);
409: forced_command = have_forced ? xstrdup("true") : NULL;
410:
1.1 provos 411: buffer_free(&m);
412:
413: return (allowed);
414: }
415:
1.3 markus 416: /*
1.1 provos 417: * This key verify needs to send the key type along, because the
418: * privileged parent makes the decision if the key is allowed
419: * for authentication.
420: */
421:
422: int
1.92 markus 423: mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
424: const u_char *data, size_t datalen, u_int compat)
1.1 provos 425: {
426: Buffer m;
427: u_char *blob;
428: u_int len;
1.92 markus 429: u_int encoded_ret = 0;
1.1 provos 430:
1.8 markus 431: debug3("%s entering", __func__);
1.1 provos 432:
433: /* Convert the key to a blob and the pass it over */
434: if (!key_to_blob(key, &blob, &len))
435: return (0);
436:
437: buffer_init(&m);
438: buffer_put_string(&m, blob, len);
439: buffer_put_string(&m, sig, siglen);
440: buffer_put_string(&m, data, datalen);
1.76 djm 441: free(blob);
1.1 provos 442:
1.7 mouring 443: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
1.1 provos 444:
1.8 markus 445: debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
1.7 mouring 446: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
1.1 provos 447:
1.92 markus 448: encoded_ret = buffer_get_int(&m);
1.1 provos 449:
450: buffer_free(&m);
451:
1.92 markus 452: if (encoded_ret != 0)
453: return SSH_ERR_SIGNATURE_INVALID;
454: return 0;
1.1 provos 455: }
456:
457: void
1.36 avsm 458: mm_send_keystate(struct monitor *monitor)
1.1 provos 459: {
1.82 markus 460: struct ssh *ssh = active_state; /* XXX */
461: struct sshbuf *m;
462: int r;
463:
464: if ((m = sshbuf_new()) == NULL)
465: fatal("%s: sshbuf_new failed", __func__);
466: if ((r = ssh_packet_get_state(ssh, m)) != 0)
467: fatal("%s: get_state failed: %s",
468: __func__, ssh_err(r));
469: mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, m);
1.8 markus 470: debug3("%s: Finished sending state", __func__);
1.82 markus 471: sshbuf_free(m);
1.1 provos 472: }
473:
474: int
1.42 deraadt 475: mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen)
1.1 provos 476: {
477: Buffer m;
1.39 dtucker 478: char *p, *msg;
1.62 djm 479: int success = 0, tmp1 = -1, tmp2 = -1;
480:
481: /* Kludge: ensure there are fds free to receive the pty/tty */
482: if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 ||
483: (tmp2 = dup(pmonitor->m_recvfd)) == -1) {
484: error("%s: cannot allocate fds for pty", __func__);
485: if (tmp1 > 0)
486: close(tmp1);
487: if (tmp2 > 0)
488: close(tmp2);
489: return 0;
490: }
491: close(tmp1);
492: close(tmp2);
1.1 provos 493:
494: buffer_init(&m);
1.7 mouring 495: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
1.1 provos 496:
1.8 markus 497: debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
1.7 mouring 498: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
1.1 provos 499:
500: success = buffer_get_int(&m);
501: if (success == 0) {
1.8 markus 502: debug3("%s: pty alloc failed", __func__);
1.1 provos 503: buffer_free(&m);
504: return (0);
505: }
506: p = buffer_get_string(&m, NULL);
1.39 dtucker 507: msg = buffer_get_string(&m, NULL);
1.1 provos 508: buffer_free(&m);
509:
510: strlcpy(namebuf, p, namebuflen); /* Possible truncation */
1.76 djm 511: free(p);
1.39 dtucker 512:
513: buffer_append(&loginmsg, msg, strlen(msg));
1.76 djm 514: free(msg);
1.1 provos 515:
1.58 djm 516: if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 ||
517: (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
518: fatal("%s: receive fds failed", __func__);
1.1 provos 519:
520: /* Success */
521: return (1);
522: }
523:
524: void
1.32 markus 525: mm_session_pty_cleanup2(Session *s)
1.1 provos 526: {
527: Buffer m;
528:
529: if (s->ttyfd == -1)
530: return;
531: buffer_init(&m);
532: buffer_put_cstring(&m, s->tty);
1.7 mouring 533: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
1.1 provos 534: buffer_free(&m);
1.3 markus 535:
1.1 provos 536: /* closed dup'ed master */
1.62 djm 537: if (s->ptymaster != -1 && close(s->ptymaster) < 0)
538: error("close(s->ptymaster/%d): %s",
539: s->ptymaster, strerror(errno));
1.1 provos 540:
541: /* unlink pty from session */
542: s->ttyfd = -1;
543: }
544:
545: /* Request process termination */
546:
547: void
548: mm_terminate(void)
549: {
550: Buffer m;
551:
552: buffer_init(&m);
1.7 mouring 553: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
1.1 provos 554: buffer_free(&m);
555: }
556:
1.2 markus 557: static void
1.1 provos 558: mm_chall_setup(char **name, char **infotxt, u_int *numprompts,
559: char ***prompts, u_int **echo_on)
560: {
1.10 deraadt 561: *name = xstrdup("");
562: *infotxt = xstrdup("");
1.1 provos 563: *numprompts = 1;
1.43 djm 564: *prompts = xcalloc(*numprompts, sizeof(char *));
565: *echo_on = xcalloc(*numprompts, sizeof(u_int));
1.1 provos 566: (*echo_on)[0] = 0;
567: }
568:
569: int
570: mm_bsdauth_query(void *ctx, char **name, char **infotxt,
571: u_int *numprompts, char ***prompts, u_int **echo_on)
572: {
573: Buffer m;
1.21 markus 574: u_int success;
1.1 provos 575: char *challenge;
576:
1.8 markus 577: debug3("%s: entering", __func__);
1.1 provos 578:
579: buffer_init(&m);
1.7 mouring 580: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
1.1 provos 581:
1.7 mouring 582: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
1.1 provos 583: &m);
1.21 markus 584: success = buffer_get_int(&m);
585: if (success == 0) {
1.8 markus 586: debug3("%s: no challenge", __func__);
1.1 provos 587: buffer_free(&m);
588: return (-1);
589: }
590:
591: /* Get the challenge, and format the response */
592: challenge = buffer_get_string(&m, NULL);
593: buffer_free(&m);
594:
595: mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
596: (*prompts)[0] = challenge;
597:
1.8 markus 598: debug3("%s: received challenge: %s", __func__, challenge);
1.1 provos 599:
600: return (0);
601: }
602:
603: int
604: mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
605: {
606: Buffer m;
607: int authok;
608:
1.8 markus 609: debug3("%s: entering", __func__);
1.1 provos 610: if (numresponses != 1)
611: return (-1);
612:
613: buffer_init(&m);
614: buffer_put_cstring(&m, responses[0]);
1.7 mouring 615: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);
1.1 provos 616:
1.7 mouring 617: mm_request_receive_expect(pmonitor->m_recvfd,
1.1 provos 618: MONITOR_ANS_BSDAUTHRESPOND, &m);
619:
620: authok = buffer_get_int(&m);
621: buffer_free(&m);
622:
623: return ((authok == 0) ? -1 : 0);
624: }
1.29 markus 625:
626: #ifdef GSSAPI
627: OM_uint32
1.36 avsm 628: mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
1.29 markus 629: {
630: Buffer m;
631: OM_uint32 major;
632:
633: /* Client doesn't get to see the context */
634: *ctx = NULL;
635:
636: buffer_init(&m);
1.36 avsm 637: buffer_put_string(&m, goid->elements, goid->length);
1.29 markus 638:
639: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
640: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);
641:
642: major = buffer_get_int(&m);
643:
644: buffer_free(&m);
645: return (major);
646: }
647:
648: OM_uint32
649: mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in,
650: gss_buffer_desc *out, OM_uint32 *flags)
651: {
652: Buffer m;
653: OM_uint32 major;
1.30 deraadt 654: u_int len;
1.29 markus 655:
656: buffer_init(&m);
657: buffer_put_string(&m, in->value, in->length);
658:
659: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
660: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);
661:
662: major = buffer_get_int(&m);
1.30 deraadt 663: out->value = buffer_get_string(&m, &len);
664: out->length = len;
1.29 markus 665: if (flags)
666: *flags = buffer_get_int(&m);
667:
668: buffer_free(&m);
669:
670: return (major);
1.35 markus 671: }
672:
673: OM_uint32
674: mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
675: {
676: Buffer m;
677: OM_uint32 major;
678:
679: buffer_init(&m);
680: buffer_put_string(&m, gssbuf->value, gssbuf->length);
681: buffer_put_string(&m, gssmic->value, gssmic->length);
682:
683: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
684: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
685: &m);
686:
687: major = buffer_get_int(&m);
688: buffer_free(&m);
689: return(major);
1.29 markus 690: }
691:
692: int
693: mm_ssh_gssapi_userok(char *user)
694: {
695: Buffer m;
696: int authenticated = 0;
697:
698: buffer_init(&m);
699:
700: mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
701: mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
702: &m);
703:
704: authenticated = buffer_get_int(&m);
705:
706: buffer_free(&m);
707: debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
708: return (authenticated);
709: }
710: #endif /* GSSAPI */
1.64 djm 711:
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