Annotation of src/usr.bin/ssh/monitor.c, Revision 1.102
1.102 ! andreas 1: /* $OpenBSD: monitor.c,v 1.101 2009/02/12 03:26:22 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:
1.67 stevesk 28: #include <sys/types.h>
29: #include <sys/wait.h>
1.79 stevesk 30: #include <sys/socket.h>
1.85 deraadt 31: #include <sys/tree.h>
1.83 stevesk 32: #include <sys/param.h>
1.95 djm 33: #include <sys/queue.h>
1.1 provos 34:
1.78 stevesk 35: #include <openssl/dh.h>
36:
1.81 stevesk 37: #include <errno.h>
1.80 stevesk 38: #include <fcntl.h>
1.65 stevesk 39: #include <paths.h>
1.78 stevesk 40: #include <pwd.h>
1.68 stevesk 41: #include <signal.h>
1.84 stevesk 42: #include <stdlib.h>
1.82 stevesk 43: #include <string.h>
1.1 provos 44:
45:
1.85 deraadt 46: #include "xmalloc.h"
1.1 provos 47: #include "ssh.h"
1.85 deraadt 48: #include "key.h"
49: #include "buffer.h"
50: #include "hostfile.h"
1.1 provos 51: #include "auth.h"
1.85 deraadt 52: #include "cipher.h"
1.1 provos 53: #include "kex.h"
54: #include "dh.h"
1.88 miod 55: #include <zlib.h>
1.1 provos 56: #include "packet.h"
57: #include "auth-options.h"
58: #include "sshpty.h"
59: #include "channels.h"
60: #include "session.h"
61: #include "sshlogin.h"
62: #include "canohost.h"
63: #include "log.h"
64: #include "servconf.h"
65: #include "monitor.h"
66: #include "monitor_mm.h"
1.85 deraadt 67: #ifdef GSSAPI
68: #include "ssh-gss.h"
69: #endif
1.1 provos 70: #include "monitor_wrap.h"
71: #include "monitor_fdpass.h"
72: #include "misc.h"
73: #include "compat.h"
74: #include "ssh2.h"
1.100 djm 75: #include "jpake.h"
1.1 provos 76:
1.46 markus 77: #ifdef GSSAPI
78: static Gssctxt *gsscontext = NULL;
79: #endif
80:
1.1 provos 81: /* Imports */
82: extern ServerOptions options;
83: extern u_int utmp_len;
84: extern Newkeys *current_keys[];
85: extern z_stream incoming_stream;
86: extern z_stream outgoing_stream;
87: extern u_char session_id[];
88: extern Buffer auth_debug;
89: extern int auth_debug_init;
1.61 dtucker 90: extern Buffer loginmsg;
1.1 provos 91:
92: /* State exported from the child */
93:
94: struct {
95: z_stream incoming;
96: z_stream outgoing;
97: u_char *keyin;
98: u_int keyinlen;
99: u_char *keyout;
100: u_int keyoutlen;
101: u_char *ivin;
102: u_int ivinlen;
103: u_char *ivout;
104: u_int ivoutlen;
1.15 markus 105: u_char *ssh1key;
106: u_int ssh1keylen;
1.1 provos 107: int ssh1cipher;
108: int ssh1protoflags;
109: u_char *input;
110: u_int ilen;
111: u_char *output;
112: u_int olen;
113: } child_state;
114:
1.43 markus 115: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 116:
117: int mm_answer_moduli(int, Buffer *);
118: int mm_answer_sign(int, Buffer *);
119: int mm_answer_pwnamallow(int, Buffer *);
1.10 djm 120: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 121: int mm_answer_authserv(int, Buffer *);
122: int mm_answer_authpassword(int, Buffer *);
123: int mm_answer_bsdauthquery(int, Buffer *);
124: int mm_answer_bsdauthrespond(int, Buffer *);
125: int mm_answer_skeyquery(int, Buffer *);
126: int mm_answer_skeyrespond(int, Buffer *);
127: int mm_answer_keyallowed(int, Buffer *);
128: int mm_answer_keyverify(int, Buffer *);
129: int mm_answer_pty(int, Buffer *);
130: int mm_answer_pty_cleanup(int, Buffer *);
131: int mm_answer_term(int, Buffer *);
132: int mm_answer_rsa_keyallowed(int, Buffer *);
133: int mm_answer_rsa_challenge(int, Buffer *);
134: int mm_answer_rsa_response(int, Buffer *);
135: int mm_answer_sesskey(int, Buffer *);
136: int mm_answer_sessid(int, Buffer *);
1.100 djm 137: int mm_answer_jpake_get_pwdata(int, Buffer *);
138: int mm_answer_jpake_step1(int, Buffer *);
139: int mm_answer_jpake_step2(int, Buffer *);
140: int mm_answer_jpake_key_confirm(int, Buffer *);
141: int mm_answer_jpake_check_confirm(int, Buffer *);
1.1 provos 142:
1.46 markus 143: #ifdef GSSAPI
144: int mm_answer_gss_setup_ctx(int, Buffer *);
145: int mm_answer_gss_accept_ctx(int, Buffer *);
146: int mm_answer_gss_userok(int, Buffer *);
1.52 markus 147: int mm_answer_gss_checkmic(int, Buffer *);
1.46 markus 148: #endif
1.25 itojun 149:
1.1 provos 150: static Authctxt *authctxt;
151: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
152:
153: /* local state for key verify */
154: static u_char *key_blob = NULL;
155: static u_int key_bloblen = 0;
156: static int key_blobtype = MM_NOKEY;
1.26 markus 157: static char *hostbased_cuser = NULL;
158: static char *hostbased_chost = NULL;
1.1 provos 159: static char *auth_method = "unknown";
1.44 markus 160: static u_int session_id2_len = 0;
1.13 markus 161: static u_char *session_id2 = NULL;
1.40 markus 162: static pid_t monitor_child_pid;
1.1 provos 163:
164: struct mon_table {
165: enum monitor_reqtype type;
166: int flags;
167: int (*f)(int, Buffer *);
168: };
169:
170: #define MON_ISAUTH 0x0004 /* Required for Authentication */
171: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
172: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 173: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 174:
175: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
176:
177: #define MON_PERMIT 0x1000 /* Request is permitted */
178:
179: struct mon_table mon_dispatch_proto20[] = {
180: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
181: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
182: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
183: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 184: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 185: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
186: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 187: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 188: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
189: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 190: #ifdef GSSAPI
191: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
192: {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
193: {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
1.52 markus 194: {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
1.46 markus 195: #endif
1.100 djm 196: #ifdef JPAKE
197: {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
198: {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
199: {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
200: {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
201: {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
202: #endif
1.1 provos 203: {0, 0, NULL}
204: };
205:
206: struct mon_table mon_dispatch_postauth20[] = {
207: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
208: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
209: {MONITOR_REQ_PTY, 0, mm_answer_pty},
210: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
211: {MONITOR_REQ_TERM, 0, mm_answer_term},
212: {0, 0, NULL}
213: };
214:
215: struct mon_table mon_dispatch_proto15[] = {
216: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
217: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
218: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
219: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
1.77 dtucker 220: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
221: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
1.1 provos 222: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
223: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
224: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 225: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 226: {0, 0, NULL}
227: };
228:
229: struct mon_table mon_dispatch_postauth15[] = {
230: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
231: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
232: {MONITOR_REQ_TERM, 0, mm_answer_term},
233: {0, 0, NULL}
234: };
235:
236: struct mon_table *mon_dispatch;
237:
238: /* Specifies if a certain message is allowed at the moment */
239:
240: static void
241: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
242: {
243: while (ent->f != NULL) {
244: if (ent->type == type) {
245: ent->flags &= ~MON_PERMIT;
246: ent->flags |= permit ? MON_PERMIT : 0;
247: return;
248: }
249: ent++;
250: }
251: }
252:
253: static void
254: monitor_permit_authentications(int permit)
255: {
256: struct mon_table *ent = mon_dispatch;
257:
258: while (ent->f != NULL) {
259: if (ent->flags & MON_AUTH) {
260: ent->flags &= ~MON_PERMIT;
261: ent->flags |= permit ? MON_PERMIT : 0;
262: }
263: ent++;
264: }
265: }
266:
1.50 markus 267: void
268: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 269: {
270: struct mon_table *ent;
271: int authenticated = 0;
272:
273: debug3("preauth child monitor started");
274:
1.50 markus 275: authctxt = _authctxt;
276: memset(authctxt, 0, sizeof(*authctxt));
277:
1.1 provos 278: if (compat20) {
279: mon_dispatch = mon_dispatch_proto20;
280:
281: /* Permit requests for moduli and signatures */
282: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
283: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
284: } else {
285: mon_dispatch = mon_dispatch_proto15;
286:
287: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
288: }
289:
290: /* The first few requests do not require asynchronous access */
291: while (!authenticated) {
1.77 dtucker 292: auth_method = "unknown";
1.89 markus 293: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.1 provos 294: if (authenticated) {
295: if (!(ent->flags & MON_AUTHDECIDE))
296: fatal("%s: unexpected authentication from %d",
1.14 markus 297: __func__, ent->type);
1.1 provos 298: if (authctxt->pw->pw_uid == 0 &&
299: !auth_root_allowed(auth_method))
300: authenticated = 0;
301: }
302:
1.77 dtucker 303: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.1 provos 304: auth_log(authctxt, authenticated, auth_method,
305: compat20 ? " ssh2" : "");
306: if (!authenticated)
307: authctxt->failures++;
308: }
1.100 djm 309: #ifdef JPAKE
310: /* Cleanup JPAKE context after authentication */
311: if (ent->flags & MON_AUTHDECIDE) {
312: if (authctxt->jpake_ctx != NULL) {
313: jpake_free(authctxt->jpake_ctx);
314: authctxt->jpake_ctx = NULL;
315: }
316: }
317: #endif
1.1 provos 318: }
319:
320: if (!authctxt->valid)
1.14 markus 321: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 322: if (strcmp(auth_method, "unknown") == 0)
323: fatal("%s: authentication method name unknown", __func__);
1.1 provos 324:
325: debug("%s: %s has been authenticated by privileged process",
1.14 markus 326: __func__, authctxt->user);
1.1 provos 327:
1.11 mouring 328: mm_get_keystate(pmonitor);
1.1 provos 329: }
330:
1.40 markus 331: static void
332: monitor_set_child_handler(pid_t pid)
333: {
334: monitor_child_pid = pid;
335: }
336:
337: static void
1.59 avsm 338: monitor_child_handler(int sig)
1.40 markus 339: {
1.59 avsm 340: kill(monitor_child_pid, sig);
1.40 markus 341: }
342:
1.1 provos 343: void
1.11 mouring 344: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 345: {
1.40 markus 346: monitor_set_child_handler(pmonitor->m_pid);
347: signal(SIGHUP, &monitor_child_handler);
348: signal(SIGTERM, &monitor_child_handler);
1.91 djm 349: signal(SIGINT, &monitor_child_handler);
1.40 markus 350:
1.1 provos 351: if (compat20) {
352: mon_dispatch = mon_dispatch_postauth20;
353:
354: /* Permit requests for moduli and signatures */
355: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
356: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
357: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
358: } else {
359: mon_dispatch = mon_dispatch_postauth15;
360: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
361: }
362: if (!no_pty_flag) {
363: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
364: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
365: }
366:
367: for (;;)
1.11 mouring 368: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 369: }
370:
371: void
1.11 mouring 372: monitor_sync(struct monitor *pmonitor)
1.1 provos 373: {
1.16 djm 374: if (options.compression) {
375: /* The member allocation is not visible, so sync it */
376: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
377: }
1.1 provos 378: }
379:
380: int
1.11 mouring 381: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 382: struct mon_table **pent)
383: {
384: Buffer m;
385: int ret;
386: u_char type;
387:
388: buffer_init(&m);
389:
1.11 mouring 390: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 391: type = buffer_get_char(&m);
392:
1.14 markus 393: debug3("%s: checking request %d", __func__, type);
1.1 provos 394:
395: while (ent->f != NULL) {
396: if (ent->type == type)
397: break;
398: ent++;
399: }
400:
401: if (ent->f != NULL) {
402: if (!(ent->flags & MON_PERMIT))
1.14 markus 403: fatal("%s: unpermitted request %d", __func__,
1.1 provos 404: type);
1.11 mouring 405: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 406: buffer_free(&m);
407:
408: /* The child may use this request only once, disable it */
409: if (ent->flags & MON_ONCE) {
1.14 markus 410: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 411: type);
412: ent->flags &= ~MON_PERMIT;
413: }
414:
415: if (pent != NULL)
416: *pent = ent;
1.3 markus 417:
1.1 provos 418: return ret;
419: }
420:
1.14 markus 421: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 422:
423: /* NOTREACHED */
424: return (-1);
425: }
426:
427: /* allowed key state */
428: static int
429: monitor_allowed_key(u_char *blob, u_int bloblen)
430: {
431: /* make sure key is allowed */
432: if (key_blob == NULL || key_bloblen != bloblen ||
433: memcmp(key_blob, blob, key_bloblen))
434: return (0);
435: return (1);
436: }
437:
438: static void
439: monitor_reset_key_state(void)
440: {
441: /* reset state */
442: if (key_blob != NULL)
443: xfree(key_blob);
444: if (hostbased_cuser != NULL)
445: xfree(hostbased_cuser);
446: if (hostbased_chost != NULL)
447: xfree(hostbased_chost);
448: key_blob = NULL;
449: key_bloblen = 0;
450: key_blobtype = MM_NOKEY;
451: hostbased_cuser = NULL;
452: hostbased_chost = NULL;
453: }
454:
455: int
1.59 avsm 456: mm_answer_moduli(int sock, Buffer *m)
1.1 provos 457: {
458: DH *dh;
459: int min, want, max;
460:
461: min = buffer_get_int(m);
462: want = buffer_get_int(m);
463: max = buffer_get_int(m);
464:
465: debug3("%s: got parameters: %d %d %d",
1.14 markus 466: __func__, min, want, max);
1.1 provos 467: /* We need to check here, too, in case the child got corrupted */
468: if (max < min || want < min || max < want)
469: fatal("%s: bad parameters: %d %d %d",
1.14 markus 470: __func__, min, want, max);
1.1 provos 471:
472: buffer_clear(m);
473:
474: dh = choose_dh(min, want, max);
475: if (dh == NULL) {
476: buffer_put_char(m, 0);
477: return (0);
478: } else {
479: /* Send first bignum */
480: buffer_put_char(m, 1);
481: buffer_put_bignum2(m, dh->p);
482: buffer_put_bignum2(m, dh->g);
1.3 markus 483:
1.1 provos 484: DH_free(dh);
485: }
1.59 avsm 486: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 487: return (0);
488: }
489:
490: int
1.59 avsm 491: mm_answer_sign(int sock, Buffer *m)
1.1 provos 492: {
493: Key *key;
494: u_char *p;
495: u_char *signature;
496: u_int siglen, datlen;
497: int keyid;
1.3 markus 498:
1.14 markus 499: debug3("%s", __func__);
1.1 provos 500:
1.3 markus 501: keyid = buffer_get_int(m);
502: p = buffer_get_string(m, &datlen);
1.1 provos 503:
1.69 djm 504: /*
1.71 deraadt 505: * Supported KEX types will only return SHA1 (20 byte) or
1.69 djm 506: * SHA256 (32 byte) hashes
507: */
508: if (datlen != 20 && datlen != 32)
1.19 deraadt 509: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 510:
1.13 markus 511: /* save session id, it will be passed on the first call */
512: if (session_id2_len == 0) {
513: session_id2_len = datlen;
514: session_id2 = xmalloc(session_id2_len);
515: memcpy(session_id2, p, session_id2_len);
516: }
517:
1.1 provos 518: if ((key = get_hostkey_by_index(keyid)) == NULL)
1.14 markus 519: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 520: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1.14 markus 521: fatal("%s: key_sign failed", __func__);
1.1 provos 522:
1.19 deraadt 523: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 524:
525: buffer_clear(m);
526: buffer_put_string(m, signature, siglen);
527:
528: xfree(p);
529: xfree(signature);
530:
1.59 avsm 531: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 532:
533: /* Turn on permissions for getpwnam */
534: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
535:
536: return (0);
537: }
538:
539: /* Retrieves the password entry and also checks if the user is permitted */
540:
541: int
1.59 avsm 542: mm_answer_pwnamallow(int sock, Buffer *m)
1.1 provos 543: {
1.60 dtucker 544: char *username;
1.1 provos 545: struct passwd *pwent;
546: int allowed = 0;
1.3 markus 547:
1.14 markus 548: debug3("%s", __func__);
1.1 provos 549:
550: if (authctxt->attempt++ != 0)
1.14 markus 551: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 552:
1.60 dtucker 553: username = buffer_get_string(m, NULL);
1.1 provos 554:
1.60 dtucker 555: pwent = getpwnamallow(username);
1.1 provos 556:
1.60 dtucker 557: authctxt->user = xstrdup(username);
558: setproctitle("%s [priv]", pwent ? username : "unknown");
559: xfree(username);
1.1 provos 560:
561: buffer_clear(m);
562:
563: if (pwent == NULL) {
564: buffer_put_char(m, 0);
1.53 djm 565: authctxt->pw = fakepw();
1.1 provos 566: goto out;
567: }
568:
569: allowed = 1;
1.4 markus 570: authctxt->pw = pwent;
1.1 provos 571: authctxt->valid = 1;
572:
573: buffer_put_char(m, 1);
574: buffer_put_string(m, pwent, sizeof(struct passwd));
575: buffer_put_cstring(m, pwent->pw_name);
576: buffer_put_cstring(m, "*");
577: buffer_put_cstring(m, pwent->pw_gecos);
578: buffer_put_cstring(m, pwent->pw_class);
579: buffer_put_cstring(m, pwent->pw_dir);
580: buffer_put_cstring(m, pwent->pw_shell);
1.94 dtucker 581:
582: out:
1.90 dtucker 583: buffer_put_string(m, &options, sizeof(options));
584: if (options.banner != NULL)
585: buffer_put_cstring(m, options.banner);
1.14 markus 586: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 587: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 588:
589: /* For SSHv1 allow authentication now */
590: if (!compat20)
591: monitor_permit_authentications(1);
1.10 djm 592: else {
1.1 provos 593: /* Allow service/style information on the auth context */
594: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 595: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
596: }
597:
598:
599: return (0);
600: }
601:
1.59 avsm 602: int mm_answer_auth2_read_banner(int sock, Buffer *m)
1.10 djm 603: {
604: char *banner;
605:
606: buffer_clear(m);
607: banner = auth2_read_banner();
608: buffer_put_cstring(m, banner != NULL ? banner : "");
1.59 avsm 609: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.1 provos 610:
1.10 djm 611: if (banner != NULL)
1.21 deraadt 612: xfree(banner);
1.1 provos 613:
614: return (0);
615: }
616:
617: int
1.59 avsm 618: mm_answer_authserv(int sock, Buffer *m)
1.1 provos 619: {
620: monitor_permit_authentications(1);
621:
622: authctxt->service = buffer_get_string(m, NULL);
623: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 624: debug3("%s: service=%s, style=%s",
1.14 markus 625: __func__, authctxt->service, authctxt->style);
1.6 stevesk 626:
1.1 provos 627: if (strlen(authctxt->style) == 0) {
628: xfree(authctxt->style);
629: authctxt->style = NULL;
630: }
631:
632: return (0);
633: }
634:
635: int
1.59 avsm 636: mm_answer_authpassword(int sock, Buffer *m)
1.1 provos 637: {
638: static int call_count;
639: char *passwd;
1.22 stevesk 640: int authenticated;
641: u_int plen;
1.1 provos 642:
643: passwd = buffer_get_string(m, &plen);
644: /* Only authenticate if the context is valid */
1.12 markus 645: authenticated = options.password_authentication &&
1.48 markus 646: auth_password(authctxt, passwd);
1.1 provos 647: memset(passwd, 0, strlen(passwd));
648: xfree(passwd);
649:
650: buffer_clear(m);
651: buffer_put_int(m, authenticated);
652:
1.14 markus 653: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 654: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 655:
656: call_count++;
657: if (plen == 0 && call_count == 1)
658: auth_method = "none";
659: else
660: auth_method = "password";
661:
662: /* Causes monitor loop to terminate if authenticated */
663: return (authenticated);
664: }
665:
666: int
1.59 avsm 667: mm_answer_bsdauthquery(int sock, Buffer *m)
1.1 provos 668: {
669: char *name, *infotxt;
670: u_int numprompts;
671: u_int *echo_on;
672: char **prompts;
1.31 markus 673: u_int success;
1.1 provos 674:
1.31 markus 675: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
676: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 677:
678: buffer_clear(m);
1.31 markus 679: buffer_put_int(m, success);
680: if (success)
1.1 provos 681: buffer_put_cstring(m, prompts[0]);
682:
1.31 markus 683: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 684: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 685:
1.31 markus 686: if (success) {
1.1 provos 687: xfree(name);
688: xfree(infotxt);
689: xfree(prompts);
690: xfree(echo_on);
691: }
692:
693: return (0);
694: }
695:
696: int
1.59 avsm 697: mm_answer_bsdauthrespond(int sock, Buffer *m)
1.1 provos 698: {
699: char *response;
700: int authok;
701:
702: if (authctxt->as == 0)
1.14 markus 703: fatal("%s: no bsd auth session", __func__);
1.1 provos 704:
705: response = buffer_get_string(m, NULL);
1.12 markus 706: authok = options.challenge_response_authentication &&
707: auth_userresponse(authctxt->as, response, 0);
1.1 provos 708: authctxt->as = NULL;
1.14 markus 709: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.1 provos 710: xfree(response);
711:
712: buffer_clear(m);
713: buffer_put_int(m, authok);
714:
1.14 markus 715: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 716: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 717:
718: auth_method = "bsdauth";
719:
720: return (authok != 0);
721: }
722:
723:
1.2 markus 724: static void
1.1 provos 725: mm_append_debug(Buffer *m)
726: {
727: if (auth_debug_init && buffer_len(&auth_debug)) {
1.14 markus 728: debug3("%s: Appending debug messages for child", __func__);
1.1 provos 729: buffer_append(m, buffer_ptr(&auth_debug),
730: buffer_len(&auth_debug));
731: buffer_clear(&auth_debug);
732: }
733: }
734:
735: int
1.59 avsm 736: mm_answer_keyallowed(int sock, Buffer *m)
1.1 provos 737: {
738: Key *key;
1.26 markus 739: char *cuser, *chost;
740: u_char *blob;
1.1 provos 741: u_int bloblen;
742: enum mm_keytype type = 0;
743: int allowed = 0;
744:
1.14 markus 745: debug3("%s entering", __func__);
1.3 markus 746:
1.1 provos 747: type = buffer_get_int(m);
748: cuser = buffer_get_string(m, NULL);
749: chost = buffer_get_string(m, NULL);
750: blob = buffer_get_string(m, &bloblen);
751:
752: key = key_from_blob(blob, bloblen);
753:
754: if ((compat20 && type == MM_RSAHOSTKEY) ||
755: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 756: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 757:
1.14 markus 758: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 759:
1.51 djm 760: if (key != NULL && authctxt->valid) {
1.63 deraadt 761: switch (type) {
1.1 provos 762: case MM_USERKEY:
1.12 markus 763: allowed = options.pubkey_authentication &&
764: user_key_allowed(authctxt->pw, key);
1.77 dtucker 765: auth_method = "publickey";
1.97 dtucker 766: if (options.pubkey_authentication && allowed != 1)
767: auth_clear_options();
1.1 provos 768: break;
769: case MM_HOSTKEY:
1.12 markus 770: allowed = options.hostbased_authentication &&
771: hostbased_key_allowed(authctxt->pw,
1.1 provos 772: cuser, chost, key);
1.77 dtucker 773: auth_method = "hostbased";
1.1 provos 774: break;
775: case MM_RSAHOSTKEY:
776: key->type = KEY_RSA1; /* XXX */
1.12 markus 777: allowed = options.rhosts_rsa_authentication &&
778: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 779: cuser, chost, key);
1.97 dtucker 780: if (options.rhosts_rsa_authentication && allowed != 1)
781: auth_clear_options();
1.77 dtucker 782: auth_method = "rsa";
1.1 provos 783: break;
784: default:
1.14 markus 785: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 786: break;
787: }
1.33 markus 788: }
789: if (key != NULL)
1.1 provos 790: key_free(key);
791:
792: /* clear temporarily storage (used by verify) */
793: monitor_reset_key_state();
794:
795: if (allowed) {
796: /* Save temporarily for comparison in verify */
797: key_blob = blob;
798: key_bloblen = bloblen;
799: key_blobtype = type;
800: hostbased_cuser = cuser;
801: hostbased_chost = chost;
1.72 djm 802: } else {
1.77 dtucker 803: /* Log failed attempt */
804: auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1.72 djm 805: xfree(blob);
806: xfree(cuser);
807: xfree(chost);
1.1 provos 808: }
809:
810: debug3("%s: key %p is %s",
1.98 dtucker 811: __func__, key, allowed ? "allowed" : "not allowed");
1.1 provos 812:
813: buffer_clear(m);
814: buffer_put_int(m, allowed);
1.32 markus 815: buffer_put_int(m, forced_command != NULL);
1.1 provos 816:
817: mm_append_debug(m);
818:
1.59 avsm 819: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 820:
821: if (type == MM_RSAHOSTKEY)
822: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
823:
824: return (0);
825: }
826:
827: static int
828: monitor_valid_userblob(u_char *data, u_int datalen)
829: {
830: Buffer b;
1.26 markus 831: char *p;
1.1 provos 832: u_int len;
833: int fail = 0;
834:
835: buffer_init(&b);
836: buffer_append(&b, data, datalen);
1.3 markus 837:
1.1 provos 838: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 839: p = buffer_ptr(&b);
840: len = buffer_len(&b);
841: if ((session_id2 == NULL) ||
842: (len < session_id2_len) ||
843: (memcmp(p, session_id2, session_id2_len) != 0))
844: fail++;
1.1 provos 845: buffer_consume(&b, session_id2_len);
846: } else {
1.13 markus 847: p = buffer_get_string(&b, &len);
848: if ((session_id2 == NULL) ||
849: (len != session_id2_len) ||
850: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 851: fail++;
1.13 markus 852: xfree(p);
1.1 provos 853: }
854: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
855: fail++;
856: p = buffer_get_string(&b, NULL);
857: if (strcmp(authctxt->user, p) != 0) {
1.38 itojun 858: logit("wrong user name passed to monitor: expected %s != %.100s",
1.1 provos 859: authctxt->user, p);
860: fail++;
861: }
862: xfree(p);
863: buffer_skip_string(&b);
864: if (datafellows & SSH_BUG_PKAUTH) {
865: if (!buffer_get_char(&b))
866: fail++;
867: } else {
868: p = buffer_get_string(&b, NULL);
869: if (strcmp("publickey", p) != 0)
870: fail++;
871: xfree(p);
872: if (!buffer_get_char(&b))
873: fail++;
874: buffer_skip_string(&b);
875: }
876: buffer_skip_string(&b);
877: if (buffer_len(&b) != 0)
878: fail++;
879: buffer_free(&b);
880: return (fail == 0);
881: }
882:
883: static int
1.26 markus 884: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
885: char *chost)
1.1 provos 886: {
887: Buffer b;
1.26 markus 888: char *p;
1.1 provos 889: u_int len;
890: int fail = 0;
891:
892: buffer_init(&b);
893: buffer_append(&b, data, datalen);
1.3 markus 894:
1.13 markus 895: p = buffer_get_string(&b, &len);
896: if ((session_id2 == NULL) ||
897: (len != session_id2_len) ||
898: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 899: fail++;
1.13 markus 900: xfree(p);
901:
1.1 provos 902: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
903: fail++;
904: p = buffer_get_string(&b, NULL);
905: if (strcmp(authctxt->user, p) != 0) {
1.38 itojun 906: logit("wrong user name passed to monitor: expected %s != %.100s",
1.1 provos 907: authctxt->user, p);
908: fail++;
909: }
910: xfree(p);
911: buffer_skip_string(&b); /* service */
912: p = buffer_get_string(&b, NULL);
913: if (strcmp(p, "hostbased") != 0)
914: fail++;
915: xfree(p);
916: buffer_skip_string(&b); /* pkalg */
917: buffer_skip_string(&b); /* pkblob */
918:
919: /* verify client host, strip trailing dot if necessary */
920: p = buffer_get_string(&b, NULL);
921: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
922: p[len - 1] = '\0';
923: if (strcmp(p, chost) != 0)
924: fail++;
925: xfree(p);
926:
927: /* verify client user */
928: p = buffer_get_string(&b, NULL);
929: if (strcmp(p, cuser) != 0)
930: fail++;
931: xfree(p);
932:
933: if (buffer_len(&b) != 0)
934: fail++;
935: buffer_free(&b);
936: return (fail == 0);
937: }
938:
939: int
1.59 avsm 940: mm_answer_keyverify(int sock, Buffer *m)
1.1 provos 941: {
942: Key *key;
943: u_char *signature, *data, *blob;
944: u_int signaturelen, datalen, bloblen;
945: int verified = 0;
946: int valid_data = 0;
947:
948: blob = buffer_get_string(m, &bloblen);
949: signature = buffer_get_string(m, &signaturelen);
950: data = buffer_get_string(m, &datalen);
951:
952: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 953: !monitor_allowed_key(blob, bloblen))
1.14 markus 954: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 955:
956: key = key_from_blob(blob, bloblen);
957: if (key == NULL)
1.14 markus 958: fatal("%s: bad public key blob", __func__);
1.1 provos 959:
960: switch (key_blobtype) {
961: case MM_USERKEY:
962: valid_data = monitor_valid_userblob(data, datalen);
963: break;
964: case MM_HOSTKEY:
965: valid_data = monitor_valid_hostbasedblob(data, datalen,
966: hostbased_cuser, hostbased_chost);
967: break;
968: default:
969: valid_data = 0;
970: break;
971: }
972: if (!valid_data)
1.14 markus 973: fatal("%s: bad signature data blob", __func__);
1.1 provos 974:
975: verified = key_verify(key, signature, signaturelen, data, datalen);
976: debug3("%s: key %p signature %s",
1.89 markus 977: __func__, key, (verified == 1) ? "verified" : "unverified");
1.1 provos 978:
979: key_free(key);
980: xfree(blob);
981: xfree(signature);
982: xfree(data);
983:
1.17 stevesk 984: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
985:
1.1 provos 986: monitor_reset_key_state();
1.3 markus 987:
1.1 provos 988: buffer_clear(m);
989: buffer_put_int(m, verified);
1.59 avsm 990: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 991:
1.89 markus 992: return (verified == 1);
1.1 provos 993: }
994:
1.2 markus 995: static void
1.1 provos 996: mm_record_login(Session *s, struct passwd *pw)
997: {
998: socklen_t fromlen;
999: struct sockaddr_storage from;
1000:
1001: /*
1002: * Get IP address of client. If the connection is not a socket, let
1003: * the address be 0.0.0.0.
1004: */
1005: memset(&from, 0, sizeof(from));
1.24 stevesk 1006: fromlen = sizeof(from);
1.1 provos 1007: if (packet_connection_is_on_socket()) {
1008: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1009: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1010: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1011: cleanup_exit(255);
1.1 provos 1012: }
1013: }
1014: /* Record that there was a login on that tty from the remote host. */
1015: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.42 markus 1016: get_remote_name_or_ip(utmp_len, options.use_dns),
1.24 stevesk 1017: (struct sockaddr *)&from, fromlen);
1.1 provos 1018: }
1019:
1020: static void
1021: mm_session_close(Session *s)
1022: {
1.41 djm 1023: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1024: if (s->ttyfd != -1) {
1.86 stevesk 1025: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1026: session_pty_cleanup2(s);
1027: }
1.96 djm 1028: session_unused(s->self);
1.1 provos 1029: }
1030:
1031: int
1.59 avsm 1032: mm_answer_pty(int sock, Buffer *m)
1.1 provos 1033: {
1.11 mouring 1034: extern struct monitor *pmonitor;
1.1 provos 1035: Session *s;
1036: int res, fd0;
1037:
1.14 markus 1038: debug3("%s entering", __func__);
1.1 provos 1039:
1040: buffer_clear(m);
1041: s = session_new();
1042: if (s == NULL)
1043: goto error;
1044: s->authctxt = authctxt;
1045: s->pw = authctxt->pw;
1.11 mouring 1046: s->pid = pmonitor->m_pid;
1.1 provos 1047: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1048: if (res == 0)
1049: goto error;
1050: pty_setowner(authctxt->pw, s->tty);
1051:
1052: buffer_put_int(m, 1);
1053: buffer_put_cstring(m, s->tty);
1054:
1055: /* We need to trick ttyslot */
1056: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1057: fatal("%s: dup2", __func__);
1.1 provos 1058:
1059: mm_record_login(s, authctxt->pw);
1060:
1061: /* Now we can close the file descriptor again */
1062: close(0);
1.61 dtucker 1063:
1064: /* send messages generated by record_login */
1065: buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1066: buffer_clear(&loginmsg);
1067:
1068: mm_request_send(sock, MONITOR_ANS_PTY, m);
1069:
1.92 djm 1070: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1071: mm_send_fd(sock, s->ttyfd) == -1)
1072: fatal("%s: send fds failed", __func__);
1.1 provos 1073:
1074: /* make sure nothing uses fd 0 */
1075: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1076: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1077: if (fd0 != 0)
1.14 markus 1078: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1079:
1080: /* slave is not needed */
1081: close(s->ttyfd);
1082: s->ttyfd = s->ptyfd;
1083: /* no need to dup() because nobody closes ptyfd */
1084: s->ptymaster = s->ptyfd;
1085:
1.86 stevesk 1086: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1087:
1088: return (0);
1089:
1090: error:
1091: if (s != NULL)
1092: mm_session_close(s);
1093: buffer_put_int(m, 0);
1.59 avsm 1094: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1095: return (0);
1096: }
1097:
1098: int
1.59 avsm 1099: mm_answer_pty_cleanup(int sock, Buffer *m)
1.1 provos 1100: {
1101: Session *s;
1102: char *tty;
1103:
1.14 markus 1104: debug3("%s entering", __func__);
1.1 provos 1105:
1106: tty = buffer_get_string(m, NULL);
1107: if ((s = session_by_tty(tty)) != NULL)
1108: mm_session_close(s);
1109: buffer_clear(m);
1110: xfree(tty);
1111: return (0);
1112: }
1113:
1114: int
1.59 avsm 1115: mm_answer_sesskey(int sock, Buffer *m)
1.1 provos 1116: {
1117: BIGNUM *p;
1118: int rsafail;
1119:
1120: /* Turn off permissions */
1.62 dtucker 1121: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1.1 provos 1122:
1123: if ((p = BN_new()) == NULL)
1.14 markus 1124: fatal("%s: BN_new", __func__);
1.1 provos 1125:
1126: buffer_get_bignum2(m, p);
1127:
1128: rsafail = ssh1_session_key(p);
1129:
1130: buffer_clear(m);
1131: buffer_put_int(m, rsafail);
1132: buffer_put_bignum2(m, p);
1133:
1134: BN_clear_free(p);
1135:
1.59 avsm 1136: mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1.1 provos 1137:
1138: /* Turn on permissions for sessid passing */
1139: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1140:
1141: return (0);
1142: }
1143:
1144: int
1.59 avsm 1145: mm_answer_sessid(int sock, Buffer *m)
1.1 provos 1146: {
1147: int i;
1148:
1.14 markus 1149: debug3("%s entering", __func__);
1.1 provos 1150:
1151: if (buffer_len(m) != 16)
1.14 markus 1152: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1153: for (i = 0; i < 16; i++)
1154: session_id[i] = buffer_get_char(m);
1155:
1156: /* Turn on permissions for getpwnam */
1157: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1158:
1159: return (0);
1160: }
1161:
1162: int
1.59 avsm 1163: mm_answer_rsa_keyallowed(int sock, Buffer *m)
1.1 provos 1164: {
1165: BIGNUM *client_n;
1166: Key *key = NULL;
1.3 markus 1167: u_char *blob = NULL;
1168: u_int blen = 0;
1.1 provos 1169: int allowed = 0;
1170:
1.14 markus 1171: debug3("%s entering", __func__);
1.1 provos 1172:
1.77 dtucker 1173: auth_method = "rsa";
1.12 markus 1174: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1175: if ((client_n = BN_new()) == NULL)
1.14 markus 1176: fatal("%s: BN_new", __func__);
1.1 provos 1177: buffer_get_bignum2(m, client_n);
1178: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1179: BN_clear_free(client_n);
1180: }
1181: buffer_clear(m);
1182: buffer_put_int(m, allowed);
1.32 markus 1183: buffer_put_int(m, forced_command != NULL);
1.1 provos 1184:
1185: /* clear temporarily storage (used by generate challenge) */
1186: monitor_reset_key_state();
1187:
1188: if (allowed && key != NULL) {
1189: key->type = KEY_RSA; /* cheat for key_to_blob */
1190: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1191: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1192: buffer_put_string(m, blob, blen);
1193:
1194: /* Save temporarily for comparison in verify */
1195: key_blob = blob;
1196: key_bloblen = blen;
1197: key_blobtype = MM_RSAUSERKEY;
1.33 markus 1198: }
1199: if (key != NULL)
1.1 provos 1200: key_free(key);
1201:
1202: mm_append_debug(m);
1203:
1.59 avsm 1204: mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1.1 provos 1205:
1206: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1207: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1208: return (0);
1209: }
1210:
1211: int
1.59 avsm 1212: mm_answer_rsa_challenge(int sock, Buffer *m)
1.1 provos 1213: {
1214: Key *key = NULL;
1.3 markus 1215: u_char *blob;
1216: u_int blen;
1.1 provos 1217:
1.14 markus 1218: debug3("%s entering", __func__);
1.1 provos 1219:
1220: if (!authctxt->valid)
1.14 markus 1221: fatal("%s: authctxt not valid", __func__);
1.1 provos 1222: blob = buffer_get_string(m, &blen);
1223: if (!monitor_allowed_key(blob, blen))
1.14 markus 1224: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1225: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1226: fatal("%s: key type mismatch", __func__);
1.1 provos 1227: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1228: fatal("%s: received bad key", __func__);
1.101 djm 1229: if (key->type != KEY_RSA)
1230: fatal("%s: received bad key type %d", __func__, key->type);
1231: key->type = KEY_RSA1;
1.1 provos 1232: if (ssh1_challenge)
1233: BN_clear_free(ssh1_challenge);
1234: ssh1_challenge = auth_rsa_generate_challenge(key);
1235:
1236: buffer_clear(m);
1237: buffer_put_bignum2(m, ssh1_challenge);
1238:
1.14 markus 1239: debug3("%s sending reply", __func__);
1.59 avsm 1240: mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1.1 provos 1241:
1242: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1.33 markus 1243:
1244: xfree(blob);
1245: key_free(key);
1.1 provos 1246: return (0);
1247: }
1248:
1249: int
1.59 avsm 1250: mm_answer_rsa_response(int sock, Buffer *m)
1.1 provos 1251: {
1252: Key *key = NULL;
1.3 markus 1253: u_char *blob, *response;
1254: u_int blen, len;
1255: int success;
1.1 provos 1256:
1.14 markus 1257: debug3("%s entering", __func__);
1.1 provos 1258:
1259: if (!authctxt->valid)
1.14 markus 1260: fatal("%s: authctxt not valid", __func__);
1.1 provos 1261: if (ssh1_challenge == NULL)
1.14 markus 1262: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1263:
1264: blob = buffer_get_string(m, &blen);
1265: if (!monitor_allowed_key(blob, blen))
1.14 markus 1266: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1267: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1268: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1269: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1270: fatal("%s: received bad key", __func__);
1.1 provos 1271: response = buffer_get_string(m, &len);
1272: if (len != 16)
1.14 markus 1273: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1274: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1275:
1.33 markus 1276: xfree(blob);
1.1 provos 1277: key_free(key);
1278: xfree(response);
1279:
1280: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1281:
1282: /* reset state */
1283: BN_clear_free(ssh1_challenge);
1284: ssh1_challenge = NULL;
1285: monitor_reset_key_state();
1286:
1287: buffer_clear(m);
1288: buffer_put_int(m, success);
1.59 avsm 1289: mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1.1 provos 1290:
1291: return (success);
1292: }
1293:
1294: int
1.59 avsm 1295: mm_answer_term(int sock, Buffer *req)
1.1 provos 1296: {
1.11 mouring 1297: extern struct monitor *pmonitor;
1.1 provos 1298: int res, status;
1299:
1.14 markus 1300: debug3("%s: tearing down sessions", __func__);
1.1 provos 1301:
1302: /* The child is terminating */
1303: session_destroy_all(&mm_session_close);
1304:
1.11 mouring 1305: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1306: if (errno != EINTR)
1307: exit(1);
1.1 provos 1308:
1309: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1310:
1311: /* Terminate process */
1.57 deraadt 1312: exit(res);
1.1 provos 1313: }
1314:
1315: void
1.11 mouring 1316: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1317: {
1318: if (compat20) {
1319: set_newkeys(MODE_IN);
1320: set_newkeys(MODE_OUT);
1321: } else {
1322: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1323: packet_set_encryption_key(child_state.ssh1key,
1324: child_state.ssh1keylen, child_state.ssh1cipher);
1325: xfree(child_state.ssh1key);
1.1 provos 1326: }
1327:
1.15 markus 1328: /* for rc4 and other stateful ciphers */
1.1 provos 1329: packet_set_keycontext(MODE_OUT, child_state.keyout);
1330: xfree(child_state.keyout);
1331: packet_set_keycontext(MODE_IN, child_state.keyin);
1332: xfree(child_state.keyin);
1333:
1334: if (!compat20) {
1335: packet_set_iv(MODE_OUT, child_state.ivout);
1336: xfree(child_state.ivout);
1337: packet_set_iv(MODE_IN, child_state.ivin);
1338: xfree(child_state.ivin);
1339: }
1340:
1341: memcpy(&incoming_stream, &child_state.incoming,
1342: sizeof(incoming_stream));
1343: memcpy(&outgoing_stream, &child_state.outgoing,
1344: sizeof(outgoing_stream));
1.3 markus 1345:
1.1 provos 1346: /* Update with new address */
1.16 djm 1347: if (options.compression)
1348: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1349:
1350: /* Network I/O buffers */
1351: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1.102 ! andreas 1352: buffer_clear(packet_get_input());
! 1353: buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1.1 provos 1354: memset(child_state.input, 0, child_state.ilen);
1355: xfree(child_state.input);
1356:
1.102 ! andreas 1357: buffer_clear(packet_get_output());
! 1358: buffer_append(packet_get_output(), child_state.output,
! 1359: child_state.olen);
1.1 provos 1360: memset(child_state.output, 0, child_state.olen);
1361: xfree(child_state.output);
1362: }
1363:
1.2 markus 1364: static Kex *
1.1 provos 1365: mm_get_kex(Buffer *m)
1366: {
1367: Kex *kex;
1368: void *blob;
1369: u_int bloblen;
1370:
1.75 djm 1371: kex = xcalloc(1, sizeof(*kex));
1.1 provos 1372: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.13 markus 1373: if ((session_id2 == NULL) ||
1374: (kex->session_id_len != session_id2_len) ||
1375: (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1376: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1377: kex->we_need = buffer_get_int(m);
1.34 markus 1378: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1.58 djm 1379: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.34 markus 1380: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.69 djm 1381: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.1 provos 1382: kex->server = 1;
1383: kex->hostkey_type = buffer_get_int(m);
1384: kex->kex_type = buffer_get_int(m);
1385: blob = buffer_get_string(m, &bloblen);
1386: buffer_init(&kex->my);
1387: buffer_append(&kex->my, blob, bloblen);
1388: xfree(blob);
1389: blob = buffer_get_string(m, &bloblen);
1390: buffer_init(&kex->peer);
1391: buffer_append(&kex->peer, blob, bloblen);
1392: xfree(blob);
1393: kex->done = 1;
1394: kex->flags = buffer_get_int(m);
1395: kex->client_version_string = buffer_get_string(m, NULL);
1396: kex->server_version_string = buffer_get_string(m, NULL);
1397: kex->load_host_key=&get_hostkey_by_type;
1398: kex->host_key_index=&get_hostkey_index;
1399:
1400: return (kex);
1401: }
1402:
1403: /* This function requries careful sanity checking */
1404:
1405: void
1.11 mouring 1406: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1407: {
1408: Buffer m;
1409: u_char *blob, *p;
1410: u_int bloblen, plen;
1.37 markus 1411: u_int32_t seqnr, packets;
1.99 markus 1412: u_int64_t blocks, bytes;
1.1 provos 1413:
1.14 markus 1414: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1415:
1416: buffer_init(&m);
1.11 mouring 1417: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1418: if (!compat20) {
1419: child_state.ssh1protoflags = buffer_get_int(&m);
1420: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1421: child_state.ssh1key = buffer_get_string(&m,
1422: &child_state.ssh1keylen);
1.1 provos 1423: child_state.ivout = buffer_get_string(&m,
1424: &child_state.ivoutlen);
1425: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1426: goto skip;
1427: } else {
1428: /* Get the Kex for rekeying */
1.11 mouring 1429: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1430: }
1431:
1432: blob = buffer_get_string(&m, &bloblen);
1433: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1434: xfree(blob);
1435:
1.14 markus 1436: debug3("%s: Waiting for second key", __func__);
1.1 provos 1437: blob = buffer_get_string(&m, &bloblen);
1438: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1439: xfree(blob);
1.3 markus 1440:
1.1 provos 1441: /* Now get sequence numbers for the packets */
1.37 markus 1442: seqnr = buffer_get_int(&m);
1443: blocks = buffer_get_int64(&m);
1444: packets = buffer_get_int(&m);
1.99 markus 1445: bytes = buffer_get_int64(&m);
1446: packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1.37 markus 1447: seqnr = buffer_get_int(&m);
1448: blocks = buffer_get_int64(&m);
1449: packets = buffer_get_int(&m);
1.99 markus 1450: bytes = buffer_get_int64(&m);
1451: packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1.1 provos 1452:
1453: skip:
1454: /* Get the key context */
1455: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1456: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1457:
1.14 markus 1458: debug3("%s: Getting compression state", __func__);
1.1 provos 1459: /* Get compression state */
1460: p = buffer_get_string(&m, &plen);
1461: if (plen != sizeof(child_state.outgoing))
1.14 markus 1462: fatal("%s: bad request size", __func__);
1.1 provos 1463: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1464: xfree(p);
1465:
1466: p = buffer_get_string(&m, &plen);
1467: if (plen != sizeof(child_state.incoming))
1.14 markus 1468: fatal("%s: bad request size", __func__);
1.1 provos 1469: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1470: xfree(p);
1471:
1472: /* Network I/O buffers */
1.14 markus 1473: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1474: child_state.input = buffer_get_string(&m, &child_state.ilen);
1475: child_state.output = buffer_get_string(&m, &child_state.olen);
1476:
1477: buffer_free(&m);
1478: }
1479:
1480:
1481: /* Allocation functions for zlib */
1482: void *
1483: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1484: {
1.30 markus 1485: size_t len = (size_t) size * ncount;
1.1 provos 1486: void *address;
1487:
1.23 millert 1488: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1489: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1490:
1491: address = mm_malloc(mm, len);
1.1 provos 1492:
1493: return (address);
1494: }
1495:
1496: void
1497: mm_zfree(struct mm_master *mm, void *address)
1498: {
1499: mm_free(mm, address);
1500: }
1501:
1502: void
1503: mm_init_compression(struct mm_master *mm)
1504: {
1505: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1506: outgoing_stream.zfree = (free_func)mm_zfree;
1507: outgoing_stream.opaque = mm;
1508:
1509: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1510: incoming_stream.zfree = (free_func)mm_zfree;
1511: incoming_stream.opaque = mm;
1512: }
1513:
1514: /* XXX */
1515:
1516: #define FD_CLOSEONEXEC(x) do { \
1517: if (fcntl(x, F_SETFD, 1) == -1) \
1518: fatal("fcntl(%d, F_SETFD)", x); \
1519: } while (0)
1520:
1.2 markus 1521: static void
1.1 provos 1522: monitor_socketpair(int *pair)
1.3 markus 1523: {
1.1 provos 1524: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.14 markus 1525: fatal("%s: socketpair", __func__);
1.1 provos 1526: FD_CLOSEONEXEC(pair[0]);
1527: FD_CLOSEONEXEC(pair[1]);
1528: }
1529:
1530: #define MM_MEMSIZE 65536
1531:
1532: struct monitor *
1533: monitor_init(void)
1534: {
1535: struct monitor *mon;
1536: int pair[2];
1537:
1.75 djm 1538: mon = xcalloc(1, sizeof(*mon));
1.1 provos 1539:
1540: monitor_socketpair(pair);
1541:
1542: mon->m_recvfd = pair[0];
1543: mon->m_sendfd = pair[1];
1544:
1545: /* Used to share zlib space across processes */
1.16 djm 1546: if (options.compression) {
1547: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1548: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1549:
1.16 djm 1550: /* Compression needs to share state across borders */
1551: mm_init_compression(mon->m_zlib);
1552: }
1.1 provos 1553:
1554: return mon;
1555: }
1556:
1557: void
1558: monitor_reinit(struct monitor *mon)
1559: {
1560: int pair[2];
1561:
1562: monitor_socketpair(pair);
1563:
1564: mon->m_recvfd = pair[0];
1565: mon->m_sendfd = pair[1];
1566: }
1.46 markus 1567:
1568: #ifdef GSSAPI
1569: int
1.59 avsm 1570: mm_answer_gss_setup_ctx(int sock, Buffer *m)
1.46 markus 1571: {
1.59 avsm 1572: gss_OID_desc goid;
1.46 markus 1573: OM_uint32 major;
1574: u_int len;
1575:
1.59 avsm 1576: goid.elements = buffer_get_string(m, &len);
1577: goid.length = len;
1.46 markus 1578:
1.59 avsm 1579: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1580:
1.59 avsm 1581: xfree(goid.elements);
1.46 markus 1582:
1583: buffer_clear(m);
1584: buffer_put_int(m, major);
1585:
1.64 stevesk 1586: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1587:
1588: /* Now we have a context, enable the step */
1589: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1590:
1591: return (0);
1592: }
1593:
1594: int
1.59 avsm 1595: mm_answer_gss_accept_ctx(int sock, Buffer *m)
1.46 markus 1596: {
1597: gss_buffer_desc in;
1598: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1599: OM_uint32 major, minor;
1.46 markus 1600: OM_uint32 flags = 0; /* GSI needs this */
1.47 deraadt 1601: u_int len;
1.46 markus 1602:
1.47 deraadt 1603: in.value = buffer_get_string(m, &len);
1604: in.length = len;
1.46 markus 1605: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1606: xfree(in.value);
1607:
1608: buffer_clear(m);
1609: buffer_put_int(m, major);
1610: buffer_put_string(m, out.value, out.length);
1611: buffer_put_int(m, flags);
1.59 avsm 1612: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1613:
1614: gss_release_buffer(&minor, &out);
1615:
1.64 stevesk 1616: if (major == GSS_S_COMPLETE) {
1.46 markus 1617: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1618: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1619: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1620: }
1621: return (0);
1622: }
1623:
1624: int
1.59 avsm 1625: mm_answer_gss_checkmic(int sock, Buffer *m)
1.52 markus 1626: {
1627: gss_buffer_desc gssbuf, mic;
1628: OM_uint32 ret;
1629: u_int len;
1.54 djm 1630:
1.52 markus 1631: gssbuf.value = buffer_get_string(m, &len);
1632: gssbuf.length = len;
1633: mic.value = buffer_get_string(m, &len);
1634: mic.length = len;
1.54 djm 1635:
1.52 markus 1636: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1637:
1.52 markus 1638: xfree(gssbuf.value);
1639: xfree(mic.value);
1.54 djm 1640:
1.52 markus 1641: buffer_clear(m);
1642: buffer_put_int(m, ret);
1.54 djm 1643:
1.59 avsm 1644: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1645:
1.52 markus 1646: if (!GSS_ERROR(ret))
1647: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1648:
1.52 markus 1649: return (0);
1650: }
1651:
1652: int
1.59 avsm 1653: mm_answer_gss_userok(int sock, Buffer *m)
1.46 markus 1654: {
1655: int authenticated;
1656:
1657: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1658:
1659: buffer_clear(m);
1660: buffer_put_int(m, authenticated);
1661:
1662: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1663: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1664:
1.64 stevesk 1665: auth_method = "gssapi-with-mic";
1.46 markus 1666:
1667: /* Monitor loop will terminate if authenticated */
1668: return (authenticated);
1669: }
1670: #endif /* GSSAPI */
1.100 djm 1671:
1672: #ifdef JPAKE
1673: int
1674: mm_answer_jpake_step1(int sock, Buffer *m)
1675: {
1676: struct jpake_ctx *pctx;
1677: u_char *x3_proof, *x4_proof;
1678: u_int x3_proof_len, x4_proof_len;
1679:
1680: if (!options.zero_knowledge_password_authentication)
1681: fatal("zero_knowledge_password_authentication disabled");
1682:
1683: if (authctxt->jpake_ctx != NULL)
1684: fatal("%s: authctxt->jpake_ctx already set (%p)",
1685: __func__, authctxt->jpake_ctx);
1686: authctxt->jpake_ctx = pctx = jpake_new();
1687:
1688: jpake_step1(pctx->grp,
1689: &pctx->server_id, &pctx->server_id_len,
1690: &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
1691: &x3_proof, &x3_proof_len,
1692: &x4_proof, &x4_proof_len);
1693:
1694: JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
1695:
1696: buffer_clear(m);
1697:
1698: buffer_put_string(m, pctx->server_id, pctx->server_id_len);
1699: buffer_put_bignum2(m, pctx->g_x3);
1700: buffer_put_bignum2(m, pctx->g_x4);
1701: buffer_put_string(m, x3_proof, x3_proof_len);
1702: buffer_put_string(m, x4_proof, x4_proof_len);
1703:
1704: debug3("%s: sending step1", __func__);
1705: mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
1706:
1707: bzero(x3_proof, x3_proof_len);
1708: bzero(x4_proof, x4_proof_len);
1709: xfree(x3_proof);
1710: xfree(x4_proof);
1711:
1712: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
1713: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
1714:
1715: return 0;
1716: }
1717:
1718: int
1719: mm_answer_jpake_get_pwdata(int sock, Buffer *m)
1720: {
1721: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1722: char *hash_scheme, *salt;
1723:
1724: if (pctx == NULL)
1725: fatal("%s: pctx == NULL", __func__);
1726:
1727: auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
1728:
1729: buffer_clear(m);
1730: /* pctx->s is sensitive, not returned to slave */
1731: buffer_put_cstring(m, hash_scheme);
1732: buffer_put_cstring(m, salt);
1733:
1734: debug3("%s: sending pwdata", __func__);
1735: mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
1736:
1737: bzero(hash_scheme, strlen(hash_scheme));
1738: bzero(salt, strlen(salt));
1739: xfree(hash_scheme);
1740: xfree(salt);
1741:
1742: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
1743:
1744: return 0;
1745: }
1746:
1747: int
1748: mm_answer_jpake_step2(int sock, Buffer *m)
1749: {
1750: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1751: u_char *x1_proof, *x2_proof, *x4_s_proof;
1752: u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
1753:
1754: if (pctx == NULL)
1755: fatal("%s: pctx == NULL", __func__);
1756:
1757: if ((pctx->g_x1 = BN_new()) == NULL ||
1758: (pctx->g_x2 = BN_new()) == NULL)
1759: fatal("%s: BN_new", __func__);
1760: buffer_get_bignum2(m, pctx->g_x1);
1761: buffer_get_bignum2(m, pctx->g_x2);
1762: pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
1763: x1_proof = buffer_get_string(m, &x1_proof_len);
1764: x2_proof = buffer_get_string(m, &x2_proof_len);
1765:
1766: jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
1767: pctx->g_x1, pctx->g_x2, pctx->x4,
1768: pctx->client_id, pctx->client_id_len,
1769: pctx->server_id, pctx->server_id_len,
1770: x1_proof, x1_proof_len,
1771: x2_proof, x2_proof_len,
1772: &pctx->b,
1773: &x4_s_proof, &x4_s_proof_len);
1774:
1775: JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
1776:
1777: bzero(x1_proof, x1_proof_len);
1778: bzero(x2_proof, x2_proof_len);
1779: xfree(x1_proof);
1780: xfree(x2_proof);
1781:
1782: buffer_clear(m);
1783:
1784: buffer_put_bignum2(m, pctx->b);
1785: buffer_put_string(m, x4_s_proof, x4_s_proof_len);
1786:
1787: debug3("%s: sending step2", __func__);
1788: mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
1789:
1790: bzero(x4_s_proof, x4_s_proof_len);
1791: xfree(x4_s_proof);
1792:
1793: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
1794:
1795: return 0;
1796: }
1797:
1798: int
1799: mm_answer_jpake_key_confirm(int sock, Buffer *m)
1800: {
1801: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1802: u_char *x2_s_proof;
1803: u_int x2_s_proof_len;
1804:
1805: if (pctx == NULL)
1806: fatal("%s: pctx == NULL", __func__);
1807:
1808: if ((pctx->a = BN_new()) == NULL)
1809: fatal("%s: BN_new", __func__);
1810: buffer_get_bignum2(m, pctx->a);
1811: x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
1812:
1813: jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
1814: pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
1815: pctx->server_id, pctx->server_id_len,
1816: pctx->client_id, pctx->client_id_len,
1817: session_id2, session_id2_len,
1818: x2_s_proof, x2_s_proof_len,
1819: &pctx->k,
1820: &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
1821:
1822: JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
1823:
1824: bzero(x2_s_proof, x2_s_proof_len);
1825: buffer_clear(m);
1826:
1827: /* pctx->k is sensitive, not sent */
1828: buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
1829:
1830: debug3("%s: sending confirmation hash", __func__);
1831: mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
1832:
1833: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
1834:
1835: return 0;
1836: }
1837:
1838: int
1839: mm_answer_jpake_check_confirm(int sock, Buffer *m)
1840: {
1841: int authenticated = 0;
1842: u_char *peer_confirm_hash;
1843: u_int peer_confirm_hash_len;
1844: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1845:
1846: if (pctx == NULL)
1847: fatal("%s: pctx == NULL", __func__);
1848:
1849: peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
1850:
1851: authenticated = jpake_check_confirm(pctx->k,
1852: pctx->client_id, pctx->client_id_len,
1853: session_id2, session_id2_len,
1854: peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
1855:
1856: JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
1857:
1858: bzero(peer_confirm_hash, peer_confirm_hash_len);
1859: xfree(peer_confirm_hash);
1860:
1861: buffer_clear(m);
1862: buffer_put_int(m, authenticated);
1863:
1864: debug3("%s: sending result %d", __func__, authenticated);
1865: mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
1866:
1867: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
1868:
1869: auth_method = "jpake-01@openssh.com";
1870: return authenticated;
1871: }
1872:
1873: #endif /* JPAKE */
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