Annotation of src/usr.bin/ssh/monitor.c, Revision 1.27
1.1 provos 1: /*
2: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
3: * Copyright 2002 Markus Friedl <markus@openbsd.org>
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include "includes.h"
1.27 ! markus 28: RCSID("$OpenBSD: monitor.c,v 1.26 2002/09/09 14:54:15 markus Exp $");
1.1 provos 29:
30: #include <openssl/dh.h>
31:
32: #ifdef SKEY
33: #include <skey.h>
34: #endif
35:
36: #include "ssh.h"
37: #include "auth.h"
38: #include "kex.h"
39: #include "dh.h"
40: #include "zlib.h"
41: #include "packet.h"
42: #include "auth-options.h"
43: #include "sshpty.h"
44: #include "channels.h"
45: #include "session.h"
46: #include "sshlogin.h"
47: #include "canohost.h"
48: #include "log.h"
49: #include "servconf.h"
50: #include "monitor.h"
51: #include "monitor_mm.h"
52: #include "monitor_wrap.h"
53: #include "monitor_fdpass.h"
54: #include "xmalloc.h"
55: #include "misc.h"
56: #include "buffer.h"
57: #include "bufaux.h"
58: #include "compat.h"
59: #include "ssh2.h"
60: #include "mpaux.h"
61:
62: /* Imports */
63: extern ServerOptions options;
64: extern u_int utmp_len;
65: extern Newkeys *current_keys[];
66: extern z_stream incoming_stream;
67: extern z_stream outgoing_stream;
68: extern u_char session_id[];
69: extern Buffer input, output;
70: extern Buffer auth_debug;
71: extern int auth_debug_init;
72:
73: /* State exported from the child */
74:
75: struct {
76: z_stream incoming;
77: z_stream outgoing;
78: u_char *keyin;
79: u_int keyinlen;
80: u_char *keyout;
81: u_int keyoutlen;
82: u_char *ivin;
83: u_int ivinlen;
84: u_char *ivout;
85: u_int ivoutlen;
1.15 markus 86: u_char *ssh1key;
87: u_int ssh1keylen;
1.1 provos 88: int ssh1cipher;
89: int ssh1protoflags;
90: u_char *input;
91: u_int ilen;
92: u_char *output;
93: u_int olen;
94: } child_state;
95:
96: /* Functions on the montior that answer unprivileged requests */
97:
98: int mm_answer_moduli(int, Buffer *);
99: int mm_answer_sign(int, Buffer *);
100: int mm_answer_pwnamallow(int, Buffer *);
1.10 djm 101: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 102: int mm_answer_authserv(int, Buffer *);
103: int mm_answer_authpassword(int, Buffer *);
104: int mm_answer_bsdauthquery(int, Buffer *);
105: int mm_answer_bsdauthrespond(int, Buffer *);
106: int mm_answer_skeyquery(int, Buffer *);
107: int mm_answer_skeyrespond(int, Buffer *);
108: int mm_answer_keyallowed(int, Buffer *);
109: int mm_answer_keyverify(int, Buffer *);
110: int mm_answer_pty(int, Buffer *);
111: int mm_answer_pty_cleanup(int, Buffer *);
112: int mm_answer_term(int, Buffer *);
113: int mm_answer_rsa_keyallowed(int, Buffer *);
114: int mm_answer_rsa_challenge(int, Buffer *);
115: int mm_answer_rsa_response(int, Buffer *);
116: int mm_answer_sesskey(int, Buffer *);
117: int mm_answer_sessid(int, Buffer *);
118:
1.25 itojun 119: #ifdef KRB5
120: int mm_answer_krb5(int, Buffer *);
121: #endif
122:
1.1 provos 123: static Authctxt *authctxt;
124: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
125:
126: /* local state for key verify */
127: static u_char *key_blob = NULL;
128: static u_int key_bloblen = 0;
129: static int key_blobtype = MM_NOKEY;
1.26 markus 130: static char *hostbased_cuser = NULL;
131: static char *hostbased_chost = NULL;
1.1 provos 132: static char *auth_method = "unknown";
1.13 markus 133: static int session_id2_len = 0;
134: static u_char *session_id2 = NULL;
1.1 provos 135:
136: struct mon_table {
137: enum monitor_reqtype type;
138: int flags;
139: int (*f)(int, Buffer *);
140: };
141:
142: #define MON_ISAUTH 0x0004 /* Required for Authentication */
143: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
144: #define MON_ONCE 0x0010 /* Disable after calling */
145:
146: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
147:
148: #define MON_PERMIT 0x1000 /* Request is permitted */
149:
150: struct mon_table mon_dispatch_proto20[] = {
151: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
152: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
153: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
154: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 155: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 156: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
157: #ifdef BSD_AUTH
158: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
159: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
160: #endif
161: #ifdef SKEY
162: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
163: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
164: #endif
165: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
166: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
167: {0, 0, NULL}
168: };
169:
170: struct mon_table mon_dispatch_postauth20[] = {
171: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
172: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
173: {MONITOR_REQ_PTY, 0, mm_answer_pty},
174: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
175: {MONITOR_REQ_TERM, 0, mm_answer_term},
176: {0, 0, NULL}
177: };
178:
179: struct mon_table mon_dispatch_proto15[] = {
180: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
181: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
182: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
183: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
184: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
185: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
186: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
187: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
188: #ifdef BSD_AUTH
189: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
190: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
191: #endif
192: #ifdef SKEY
193: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
194: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
195: #endif
1.25 itojun 196: #ifdef KRB5
197: {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5},
198: #endif
1.1 provos 199: {0, 0, NULL}
200: };
201:
202: struct mon_table mon_dispatch_postauth15[] = {
203: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
204: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
205: {MONITOR_REQ_TERM, 0, mm_answer_term},
206: {0, 0, NULL}
207: };
208:
209: struct mon_table *mon_dispatch;
210:
211: /* Specifies if a certain message is allowed at the moment */
212:
213: static void
214: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
215: {
216: while (ent->f != NULL) {
217: if (ent->type == type) {
218: ent->flags &= ~MON_PERMIT;
219: ent->flags |= permit ? MON_PERMIT : 0;
220: return;
221: }
222: ent++;
223: }
224: }
225:
226: static void
227: monitor_permit_authentications(int permit)
228: {
229: struct mon_table *ent = mon_dispatch;
230:
231: while (ent->f != NULL) {
232: if (ent->flags & MON_AUTH) {
233: ent->flags &= ~MON_PERMIT;
234: ent->flags |= permit ? MON_PERMIT : 0;
235: }
236: ent++;
237: }
238: }
239:
240: Authctxt *
1.11 mouring 241: monitor_child_preauth(struct monitor *pmonitor)
1.1 provos 242: {
243: struct mon_table *ent;
244: int authenticated = 0;
245:
246: debug3("preauth child monitor started");
247:
248: if (compat20) {
249: mon_dispatch = mon_dispatch_proto20;
250:
251: /* Permit requests for moduli and signatures */
252: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
253: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
254: } else {
255: mon_dispatch = mon_dispatch_proto15;
256:
257: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
258: }
259:
260: authctxt = authctxt_new();
261:
262: /* The first few requests do not require asynchronous access */
263: while (!authenticated) {
1.11 mouring 264: authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
1.1 provos 265: if (authenticated) {
266: if (!(ent->flags & MON_AUTHDECIDE))
267: fatal("%s: unexpected authentication from %d",
1.14 markus 268: __func__, ent->type);
1.1 provos 269: if (authctxt->pw->pw_uid == 0 &&
270: !auth_root_allowed(auth_method))
271: authenticated = 0;
272: }
273:
274: if (ent->flags & MON_AUTHDECIDE) {
275: auth_log(authctxt, authenticated, auth_method,
276: compat20 ? " ssh2" : "");
277: if (!authenticated)
278: authctxt->failures++;
279: }
280: }
281:
282: if (!authctxt->valid)
1.14 markus 283: fatal("%s: authenticated invalid user", __func__);
1.1 provos 284:
285: debug("%s: %s has been authenticated by privileged process",
1.14 markus 286: __func__, authctxt->user);
1.1 provos 287:
1.11 mouring 288: mm_get_keystate(pmonitor);
1.1 provos 289:
290: return (authctxt);
291: }
292:
293: void
1.11 mouring 294: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 295: {
296: if (compat20) {
297: mon_dispatch = mon_dispatch_postauth20;
298:
299: /* Permit requests for moduli and signatures */
300: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
301: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
302: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
303:
304: } else {
305: mon_dispatch = mon_dispatch_postauth15;
306: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
307: }
308: if (!no_pty_flag) {
309: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
310: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
311: }
312:
313: for (;;)
1.11 mouring 314: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 315: }
316:
317: void
1.11 mouring 318: monitor_sync(struct monitor *pmonitor)
1.1 provos 319: {
1.16 djm 320: if (options.compression) {
321: /* The member allocation is not visible, so sync it */
322: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
323: }
1.1 provos 324: }
325:
326: int
1.11 mouring 327: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 328: struct mon_table **pent)
329: {
330: Buffer m;
331: int ret;
332: u_char type;
333:
334: buffer_init(&m);
335:
1.11 mouring 336: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 337: type = buffer_get_char(&m);
338:
1.14 markus 339: debug3("%s: checking request %d", __func__, type);
1.1 provos 340:
341: while (ent->f != NULL) {
342: if (ent->type == type)
343: break;
344: ent++;
345: }
346:
347: if (ent->f != NULL) {
348: if (!(ent->flags & MON_PERMIT))
1.14 markus 349: fatal("%s: unpermitted request %d", __func__,
1.1 provos 350: type);
1.11 mouring 351: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 352: buffer_free(&m);
353:
354: /* The child may use this request only once, disable it */
355: if (ent->flags & MON_ONCE) {
1.14 markus 356: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 357: type);
358: ent->flags &= ~MON_PERMIT;
359: }
360:
361: if (pent != NULL)
362: *pent = ent;
1.3 markus 363:
1.1 provos 364: return ret;
365: }
366:
1.14 markus 367: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 368:
369: /* NOTREACHED */
370: return (-1);
371: }
372:
373: /* allowed key state */
374: static int
375: monitor_allowed_key(u_char *blob, u_int bloblen)
376: {
377: /* make sure key is allowed */
378: if (key_blob == NULL || key_bloblen != bloblen ||
379: memcmp(key_blob, blob, key_bloblen))
380: return (0);
381: return (1);
382: }
383:
384: static void
385: monitor_reset_key_state(void)
386: {
387: /* reset state */
388: if (key_blob != NULL)
389: xfree(key_blob);
390: if (hostbased_cuser != NULL)
391: xfree(hostbased_cuser);
392: if (hostbased_chost != NULL)
393: xfree(hostbased_chost);
394: key_blob = NULL;
395: key_bloblen = 0;
396: key_blobtype = MM_NOKEY;
397: hostbased_cuser = NULL;
398: hostbased_chost = NULL;
399: }
400:
401: int
402: mm_answer_moduli(int socket, Buffer *m)
403: {
404: DH *dh;
405: int min, want, max;
406:
407: min = buffer_get_int(m);
408: want = buffer_get_int(m);
409: max = buffer_get_int(m);
410:
411: debug3("%s: got parameters: %d %d %d",
1.14 markus 412: __func__, min, want, max);
1.1 provos 413: /* We need to check here, too, in case the child got corrupted */
414: if (max < min || want < min || max < want)
415: fatal("%s: bad parameters: %d %d %d",
1.14 markus 416: __func__, min, want, max);
1.1 provos 417:
418: buffer_clear(m);
419:
420: dh = choose_dh(min, want, max);
421: if (dh == NULL) {
422: buffer_put_char(m, 0);
423: return (0);
424: } else {
425: /* Send first bignum */
426: buffer_put_char(m, 1);
427: buffer_put_bignum2(m, dh->p);
428: buffer_put_bignum2(m, dh->g);
1.3 markus 429:
1.1 provos 430: DH_free(dh);
431: }
432: mm_request_send(socket, MONITOR_ANS_MODULI, m);
433: return (0);
434: }
435:
436: int
437: mm_answer_sign(int socket, Buffer *m)
438: {
439: Key *key;
440: u_char *p;
441: u_char *signature;
442: u_int siglen, datlen;
443: int keyid;
1.3 markus 444:
1.14 markus 445: debug3("%s", __func__);
1.1 provos 446:
1.3 markus 447: keyid = buffer_get_int(m);
448: p = buffer_get_string(m, &datlen);
1.1 provos 449:
450: if (datlen != 20)
1.19 deraadt 451: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 452:
1.13 markus 453: /* save session id, it will be passed on the first call */
454: if (session_id2_len == 0) {
455: session_id2_len = datlen;
456: session_id2 = xmalloc(session_id2_len);
457: memcpy(session_id2, p, session_id2_len);
458: }
459:
1.1 provos 460: if ((key = get_hostkey_by_index(keyid)) == NULL)
1.14 markus 461: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 462: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1.14 markus 463: fatal("%s: key_sign failed", __func__);
1.1 provos 464:
1.19 deraadt 465: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 466:
467: buffer_clear(m);
468: buffer_put_string(m, signature, siglen);
469:
470: xfree(p);
471: xfree(signature);
472:
473: mm_request_send(socket, MONITOR_ANS_SIGN, m);
474:
475: /* Turn on permissions for getpwnam */
476: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
477:
478: return (0);
479: }
480:
481: /* Retrieves the password entry and also checks if the user is permitted */
482:
483: int
484: mm_answer_pwnamallow(int socket, Buffer *m)
485: {
486: char *login;
487: struct passwd *pwent;
488: int allowed = 0;
1.3 markus 489:
1.14 markus 490: debug3("%s", __func__);
1.1 provos 491:
492: if (authctxt->attempt++ != 0)
1.14 markus 493: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 494:
495: login = buffer_get_string(m, NULL);
496:
497: pwent = getpwnamallow(login);
498:
499: authctxt->user = xstrdup(login);
500: setproctitle("%s [priv]", pwent ? login : "unknown");
501: xfree(login);
502:
503: buffer_clear(m);
504:
505: if (pwent == NULL) {
506: buffer_put_char(m, 0);
507: goto out;
508: }
509:
510: allowed = 1;
1.4 markus 511: authctxt->pw = pwent;
1.1 provos 512: authctxt->valid = 1;
513:
514: buffer_put_char(m, 1);
515: buffer_put_string(m, pwent, sizeof(struct passwd));
516: buffer_put_cstring(m, pwent->pw_name);
517: buffer_put_cstring(m, "*");
518: buffer_put_cstring(m, pwent->pw_gecos);
519: buffer_put_cstring(m, pwent->pw_class);
520: buffer_put_cstring(m, pwent->pw_dir);
521: buffer_put_cstring(m, pwent->pw_shell);
522:
523: out:
1.14 markus 524: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.1 provos 525: mm_request_send(socket, MONITOR_ANS_PWNAM, m);
526:
527: /* For SSHv1 allow authentication now */
528: if (!compat20)
529: monitor_permit_authentications(1);
1.10 djm 530: else {
1.1 provos 531: /* Allow service/style information on the auth context */
532: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 533: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
534: }
535:
536:
537: return (0);
538: }
539:
540: int mm_answer_auth2_read_banner(int socket, Buffer *m)
541: {
542: char *banner;
543:
544: buffer_clear(m);
545: banner = auth2_read_banner();
546: buffer_put_cstring(m, banner != NULL ? banner : "");
547: mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.1 provos 548:
1.10 djm 549: if (banner != NULL)
1.21 deraadt 550: xfree(banner);
1.1 provos 551:
552: return (0);
553: }
554:
555: int
556: mm_answer_authserv(int socket, Buffer *m)
557: {
558: monitor_permit_authentications(1);
559:
560: authctxt->service = buffer_get_string(m, NULL);
561: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 562: debug3("%s: service=%s, style=%s",
1.14 markus 563: __func__, authctxt->service, authctxt->style);
1.6 stevesk 564:
1.1 provos 565: if (strlen(authctxt->style) == 0) {
566: xfree(authctxt->style);
567: authctxt->style = NULL;
568: }
569:
570: return (0);
571: }
572:
573: int
574: mm_answer_authpassword(int socket, Buffer *m)
575: {
576: static int call_count;
577: char *passwd;
1.22 stevesk 578: int authenticated;
579: u_int plen;
1.1 provos 580:
581: passwd = buffer_get_string(m, &plen);
582: /* Only authenticate if the context is valid */
1.12 markus 583: authenticated = options.password_authentication &&
584: authctxt->valid && auth_password(authctxt, passwd);
1.1 provos 585: memset(passwd, 0, strlen(passwd));
586: xfree(passwd);
587:
588: buffer_clear(m);
589: buffer_put_int(m, authenticated);
590:
1.14 markus 591: debug3("%s: sending result %d", __func__, authenticated);
1.1 provos 592: mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
593:
594: call_count++;
595: if (plen == 0 && call_count == 1)
596: auth_method = "none";
597: else
598: auth_method = "password";
599:
600: /* Causes monitor loop to terminate if authenticated */
601: return (authenticated);
602: }
603:
604: #ifdef BSD_AUTH
605: int
606: mm_answer_bsdauthquery(int socket, Buffer *m)
607: {
608: char *name, *infotxt;
609: u_int numprompts;
610: u_int *echo_on;
611: char **prompts;
612: int res;
613:
614: res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
615: &prompts, &echo_on);
616:
617: buffer_clear(m);
618: buffer_put_int(m, res);
619: if (res != -1)
620: buffer_put_cstring(m, prompts[0]);
621:
1.14 markus 622: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 623: mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
624:
625: if (res != -1) {
626: xfree(name);
627: xfree(infotxt);
628: xfree(prompts);
629: xfree(echo_on);
630: }
631:
632: return (0);
633: }
634:
635: int
636: mm_answer_bsdauthrespond(int socket, Buffer *m)
637: {
638: char *response;
639: int authok;
640:
641: if (authctxt->as == 0)
1.14 markus 642: fatal("%s: no bsd auth session", __func__);
1.1 provos 643:
644: response = buffer_get_string(m, NULL);
1.12 markus 645: authok = options.challenge_response_authentication &&
646: auth_userresponse(authctxt->as, response, 0);
1.1 provos 647: authctxt->as = NULL;
1.14 markus 648: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.1 provos 649: xfree(response);
650:
651: buffer_clear(m);
652: buffer_put_int(m, authok);
653:
1.14 markus 654: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 655: mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
656:
657: auth_method = "bsdauth";
658:
659: return (authok != 0);
660: }
661: #endif
662:
663: #ifdef SKEY
664: int
665: mm_answer_skeyquery(int socket, Buffer *m)
666: {
667: struct skey skey;
668: char challenge[1024];
669: int res;
670:
671: res = skeychallenge(&skey, authctxt->user, challenge);
672:
673: buffer_clear(m);
674: buffer_put_int(m, res);
675: if (res != -1)
676: buffer_put_cstring(m, challenge);
677:
1.14 markus 678: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 679: mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
680:
681: return (0);
682: }
683:
684: int
685: mm_answer_skeyrespond(int socket, Buffer *m)
686: {
687: char *response;
688: int authok;
689:
690: response = buffer_get_string(m, NULL);
691:
1.12 markus 692: authok = (options.challenge_response_authentication &&
693: authctxt->valid &&
1.1 provos 694: skey_haskey(authctxt->pw->pw_name) == 0 &&
695: skey_passcheck(authctxt->pw->pw_name, response) != -1);
696:
697: xfree(response);
698:
699: buffer_clear(m);
700: buffer_put_int(m, authok);
701:
1.14 markus 702: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 703: mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
704:
705: auth_method = "skey";
706:
707: return (authok != 0);
708: }
709: #endif
710:
1.2 markus 711: static void
1.1 provos 712: mm_append_debug(Buffer *m)
713: {
714: if (auth_debug_init && buffer_len(&auth_debug)) {
1.14 markus 715: debug3("%s: Appending debug messages for child", __func__);
1.1 provos 716: buffer_append(m, buffer_ptr(&auth_debug),
717: buffer_len(&auth_debug));
718: buffer_clear(&auth_debug);
719: }
720: }
721:
722: int
723: mm_answer_keyallowed(int socket, Buffer *m)
724: {
725: Key *key;
1.26 markus 726: char *cuser, *chost;
727: u_char *blob;
1.1 provos 728: u_int bloblen;
729: enum mm_keytype type = 0;
730: int allowed = 0;
731:
1.14 markus 732: debug3("%s entering", __func__);
1.3 markus 733:
1.1 provos 734: type = buffer_get_int(m);
735: cuser = buffer_get_string(m, NULL);
736: chost = buffer_get_string(m, NULL);
737: blob = buffer_get_string(m, &bloblen);
738:
739: key = key_from_blob(blob, bloblen);
740:
741: if ((compat20 && type == MM_RSAHOSTKEY) ||
742: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 743: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 744:
1.14 markus 745: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 746:
747: if (key != NULL && authctxt->pw != NULL) {
748: switch(type) {
749: case MM_USERKEY:
1.12 markus 750: allowed = options.pubkey_authentication &&
751: user_key_allowed(authctxt->pw, key);
1.1 provos 752: break;
753: case MM_HOSTKEY:
1.12 markus 754: allowed = options.hostbased_authentication &&
755: hostbased_key_allowed(authctxt->pw,
1.1 provos 756: cuser, chost, key);
757: break;
758: case MM_RSAHOSTKEY:
759: key->type = KEY_RSA1; /* XXX */
1.12 markus 760: allowed = options.rhosts_rsa_authentication &&
761: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 762: cuser, chost, key);
763: break;
764: default:
1.14 markus 765: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 766: break;
767: }
768: key_free(key);
769: }
770:
771: /* clear temporarily storage (used by verify) */
772: monitor_reset_key_state();
773:
774: if (allowed) {
775: /* Save temporarily for comparison in verify */
776: key_blob = blob;
777: key_bloblen = bloblen;
778: key_blobtype = type;
779: hostbased_cuser = cuser;
780: hostbased_chost = chost;
781: }
782:
783: debug3("%s: key %p is %s",
1.14 markus 784: __func__, key, allowed ? "allowed" : "disallowed");
1.1 provos 785:
786: buffer_clear(m);
787: buffer_put_int(m, allowed);
788:
789: mm_append_debug(m);
790:
791: mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
792:
793: if (type == MM_RSAHOSTKEY)
794: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
795:
796: return (0);
797: }
798:
799: static int
800: monitor_valid_userblob(u_char *data, u_int datalen)
801: {
802: Buffer b;
1.26 markus 803: char *p;
1.1 provos 804: u_int len;
805: int fail = 0;
806:
807: buffer_init(&b);
808: buffer_append(&b, data, datalen);
1.3 markus 809:
1.1 provos 810: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 811: p = buffer_ptr(&b);
812: len = buffer_len(&b);
813: if ((session_id2 == NULL) ||
814: (len < session_id2_len) ||
815: (memcmp(p, session_id2, session_id2_len) != 0))
816: fail++;
1.1 provos 817: buffer_consume(&b, session_id2_len);
818: } else {
1.13 markus 819: p = buffer_get_string(&b, &len);
820: if ((session_id2 == NULL) ||
821: (len != session_id2_len) ||
822: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 823: fail++;
1.13 markus 824: xfree(p);
1.1 provos 825: }
826: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
827: fail++;
828: p = buffer_get_string(&b, NULL);
829: if (strcmp(authctxt->user, p) != 0) {
830: log("wrong user name passed to monitor: expected %s != %.100s",
831: authctxt->user, p);
832: fail++;
833: }
834: xfree(p);
835: buffer_skip_string(&b);
836: if (datafellows & SSH_BUG_PKAUTH) {
837: if (!buffer_get_char(&b))
838: fail++;
839: } else {
840: p = buffer_get_string(&b, NULL);
841: if (strcmp("publickey", p) != 0)
842: fail++;
843: xfree(p);
844: if (!buffer_get_char(&b))
845: fail++;
846: buffer_skip_string(&b);
847: }
848: buffer_skip_string(&b);
849: if (buffer_len(&b) != 0)
850: fail++;
851: buffer_free(&b);
852: return (fail == 0);
853: }
854:
855: static int
1.26 markus 856: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
857: char *chost)
1.1 provos 858: {
859: Buffer b;
1.26 markus 860: char *p;
1.1 provos 861: u_int len;
862: int fail = 0;
863:
864: buffer_init(&b);
865: buffer_append(&b, data, datalen);
1.3 markus 866:
1.13 markus 867: p = buffer_get_string(&b, &len);
868: if ((session_id2 == NULL) ||
869: (len != session_id2_len) ||
870: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 871: fail++;
1.13 markus 872: xfree(p);
873:
1.1 provos 874: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
875: fail++;
876: p = buffer_get_string(&b, NULL);
877: if (strcmp(authctxt->user, p) != 0) {
878: log("wrong user name passed to monitor: expected %s != %.100s",
879: authctxt->user, p);
880: fail++;
881: }
882: xfree(p);
883: buffer_skip_string(&b); /* service */
884: p = buffer_get_string(&b, NULL);
885: if (strcmp(p, "hostbased") != 0)
886: fail++;
887: xfree(p);
888: buffer_skip_string(&b); /* pkalg */
889: buffer_skip_string(&b); /* pkblob */
890:
891: /* verify client host, strip trailing dot if necessary */
892: p = buffer_get_string(&b, NULL);
893: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
894: p[len - 1] = '\0';
895: if (strcmp(p, chost) != 0)
896: fail++;
897: xfree(p);
898:
899: /* verify client user */
900: p = buffer_get_string(&b, NULL);
901: if (strcmp(p, cuser) != 0)
902: fail++;
903: xfree(p);
904:
905: if (buffer_len(&b) != 0)
906: fail++;
907: buffer_free(&b);
908: return (fail == 0);
909: }
910:
911: int
912: mm_answer_keyverify(int socket, Buffer *m)
913: {
914: Key *key;
915: u_char *signature, *data, *blob;
916: u_int signaturelen, datalen, bloblen;
917: int verified = 0;
918: int valid_data = 0;
919:
920: blob = buffer_get_string(m, &bloblen);
921: signature = buffer_get_string(m, &signaturelen);
922: data = buffer_get_string(m, &datalen);
923:
924: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 925: !monitor_allowed_key(blob, bloblen))
1.14 markus 926: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 927:
928: key = key_from_blob(blob, bloblen);
929: if (key == NULL)
1.14 markus 930: fatal("%s: bad public key blob", __func__);
1.1 provos 931:
932: switch (key_blobtype) {
933: case MM_USERKEY:
934: valid_data = monitor_valid_userblob(data, datalen);
935: break;
936: case MM_HOSTKEY:
937: valid_data = monitor_valid_hostbasedblob(data, datalen,
938: hostbased_cuser, hostbased_chost);
939: break;
940: default:
941: valid_data = 0;
942: break;
943: }
944: if (!valid_data)
1.14 markus 945: fatal("%s: bad signature data blob", __func__);
1.1 provos 946:
947: verified = key_verify(key, signature, signaturelen, data, datalen);
948: debug3("%s: key %p signature %s",
1.14 markus 949: __func__, key, verified ? "verified" : "unverified");
1.1 provos 950:
951: key_free(key);
952: xfree(blob);
953: xfree(signature);
954: xfree(data);
955:
1.17 stevesk 956: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
957:
1.1 provos 958: monitor_reset_key_state();
1.3 markus 959:
1.1 provos 960: buffer_clear(m);
961: buffer_put_int(m, verified);
962: mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
963:
964: return (verified);
965: }
966:
1.2 markus 967: static void
1.1 provos 968: mm_record_login(Session *s, struct passwd *pw)
969: {
970: socklen_t fromlen;
971: struct sockaddr_storage from;
972:
973: /*
974: * Get IP address of client. If the connection is not a socket, let
975: * the address be 0.0.0.0.
976: */
977: memset(&from, 0, sizeof(from));
1.24 stevesk 978: fromlen = sizeof(from);
1.1 provos 979: if (packet_connection_is_on_socket()) {
980: if (getpeername(packet_get_connection_in(),
981: (struct sockaddr *) & from, &fromlen) < 0) {
982: debug("getpeername: %.100s", strerror(errno));
983: fatal_cleanup();
984: }
985: }
986: /* Record that there was a login on that tty from the remote host. */
987: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
988: get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
1.24 stevesk 989: (struct sockaddr *)&from, fromlen);
1.1 provos 990: }
991:
992: static void
993: mm_session_close(Session *s)
994: {
1.14 markus 995: debug3("%s: session %d pid %d", __func__, s->self, s->pid);
1.1 provos 996: if (s->ttyfd != -1) {
1.14 markus 997: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 998: fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
999: session_pty_cleanup2(s);
1000: }
1001: s->used = 0;
1002: }
1003:
1004: int
1005: mm_answer_pty(int socket, Buffer *m)
1006: {
1.11 mouring 1007: extern struct monitor *pmonitor;
1.1 provos 1008: Session *s;
1009: int res, fd0;
1010:
1.14 markus 1011: debug3("%s entering", __func__);
1.1 provos 1012:
1013: buffer_clear(m);
1014: s = session_new();
1015: if (s == NULL)
1016: goto error;
1017: s->authctxt = authctxt;
1018: s->pw = authctxt->pw;
1.11 mouring 1019: s->pid = pmonitor->m_pid;
1.1 provos 1020: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1021: if (res == 0)
1022: goto error;
1023: fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1024: pty_setowner(authctxt->pw, s->tty);
1025:
1026: buffer_put_int(m, 1);
1027: buffer_put_cstring(m, s->tty);
1028: mm_request_send(socket, MONITOR_ANS_PTY, m);
1029:
1030: mm_send_fd(socket, s->ptyfd);
1031: mm_send_fd(socket, s->ttyfd);
1032:
1033: /* We need to trick ttyslot */
1034: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1035: fatal("%s: dup2", __func__);
1.1 provos 1036:
1037: mm_record_login(s, authctxt->pw);
1038:
1039: /* Now we can close the file descriptor again */
1040: close(0);
1041:
1042: /* make sure nothing uses fd 0 */
1043: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1044: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1045: if (fd0 != 0)
1.14 markus 1046: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1047:
1048: /* slave is not needed */
1049: close(s->ttyfd);
1050: s->ttyfd = s->ptyfd;
1051: /* no need to dup() because nobody closes ptyfd */
1052: s->ptymaster = s->ptyfd;
1053:
1.14 markus 1054: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1055:
1056: return (0);
1057:
1058: error:
1059: if (s != NULL)
1060: mm_session_close(s);
1061: buffer_put_int(m, 0);
1062: mm_request_send(socket, MONITOR_ANS_PTY, m);
1063: return (0);
1064: }
1065:
1066: int
1067: mm_answer_pty_cleanup(int socket, Buffer *m)
1068: {
1069: Session *s;
1070: char *tty;
1071:
1.14 markus 1072: debug3("%s entering", __func__);
1.1 provos 1073:
1074: tty = buffer_get_string(m, NULL);
1075: if ((s = session_by_tty(tty)) != NULL)
1076: mm_session_close(s);
1077: buffer_clear(m);
1078: xfree(tty);
1079: return (0);
1080: }
1081:
1082: int
1083: mm_answer_sesskey(int socket, Buffer *m)
1084: {
1085: BIGNUM *p;
1086: int rsafail;
1087:
1088: /* Turn off permissions */
1089: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1090:
1091: if ((p = BN_new()) == NULL)
1.14 markus 1092: fatal("%s: BN_new", __func__);
1.1 provos 1093:
1094: buffer_get_bignum2(m, p);
1095:
1096: rsafail = ssh1_session_key(p);
1097:
1098: buffer_clear(m);
1099: buffer_put_int(m, rsafail);
1100: buffer_put_bignum2(m, p);
1101:
1102: BN_clear_free(p);
1103:
1104: mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1105:
1106: /* Turn on permissions for sessid passing */
1107: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1108:
1109: return (0);
1110: }
1111:
1112: int
1113: mm_answer_sessid(int socket, Buffer *m)
1114: {
1115: int i;
1116:
1.14 markus 1117: debug3("%s entering", __func__);
1.1 provos 1118:
1119: if (buffer_len(m) != 16)
1.14 markus 1120: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1121: for (i = 0; i < 16; i++)
1122: session_id[i] = buffer_get_char(m);
1123:
1124: /* Turn on permissions for getpwnam */
1125: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1126:
1127: return (0);
1128: }
1129:
1130: int
1131: mm_answer_rsa_keyallowed(int socket, Buffer *m)
1132: {
1133: BIGNUM *client_n;
1134: Key *key = NULL;
1.3 markus 1135: u_char *blob = NULL;
1136: u_int blen = 0;
1.1 provos 1137: int allowed = 0;
1138:
1.14 markus 1139: debug3("%s entering", __func__);
1.1 provos 1140:
1.12 markus 1141: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1142: if ((client_n = BN_new()) == NULL)
1.14 markus 1143: fatal("%s: BN_new", __func__);
1.1 provos 1144: buffer_get_bignum2(m, client_n);
1145: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1146: BN_clear_free(client_n);
1147: }
1148: buffer_clear(m);
1149: buffer_put_int(m, allowed);
1150:
1151: /* clear temporarily storage (used by generate challenge) */
1152: monitor_reset_key_state();
1153:
1154: if (allowed && key != NULL) {
1155: key->type = KEY_RSA; /* cheat for key_to_blob */
1156: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1157: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1158: buffer_put_string(m, blob, blen);
1159:
1160: /* Save temporarily for comparison in verify */
1161: key_blob = blob;
1162: key_bloblen = blen;
1163: key_blobtype = MM_RSAUSERKEY;
1164: key_free(key);
1165: }
1166:
1167: mm_append_debug(m);
1168:
1169: mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1170:
1171: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1172: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1173: return (0);
1174: }
1175:
1176: int
1177: mm_answer_rsa_challenge(int socket, Buffer *m)
1178: {
1179: Key *key = NULL;
1.3 markus 1180: u_char *blob;
1181: u_int blen;
1.1 provos 1182:
1.14 markus 1183: debug3("%s entering", __func__);
1.1 provos 1184:
1185: if (!authctxt->valid)
1.14 markus 1186: fatal("%s: authctxt not valid", __func__);
1.1 provos 1187: blob = buffer_get_string(m, &blen);
1188: if (!monitor_allowed_key(blob, blen))
1.14 markus 1189: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1190: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1191: fatal("%s: key type mismatch", __func__);
1.1 provos 1192: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1193: fatal("%s: received bad key", __func__);
1.1 provos 1194:
1195: if (ssh1_challenge)
1196: BN_clear_free(ssh1_challenge);
1197: ssh1_challenge = auth_rsa_generate_challenge(key);
1198:
1199: buffer_clear(m);
1200: buffer_put_bignum2(m, ssh1_challenge);
1201:
1.14 markus 1202: debug3("%s sending reply", __func__);
1.1 provos 1203: mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1204:
1205: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1206: return (0);
1207: }
1208:
1209: int
1210: mm_answer_rsa_response(int socket, Buffer *m)
1211: {
1212: Key *key = NULL;
1.3 markus 1213: u_char *blob, *response;
1214: u_int blen, len;
1215: int success;
1.1 provos 1216:
1.14 markus 1217: debug3("%s entering", __func__);
1.1 provos 1218:
1219: if (!authctxt->valid)
1.14 markus 1220: fatal("%s: authctxt not valid", __func__);
1.1 provos 1221: if (ssh1_challenge == NULL)
1.14 markus 1222: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1223:
1224: blob = buffer_get_string(m, &blen);
1225: if (!monitor_allowed_key(blob, blen))
1.14 markus 1226: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1227: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1228: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1229: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1230: fatal("%s: received bad key", __func__);
1.1 provos 1231: response = buffer_get_string(m, &len);
1232: if (len != 16)
1.14 markus 1233: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1234: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1235:
1236: key_free(key);
1237: xfree(response);
1238:
1239: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1240:
1241: /* reset state */
1242: BN_clear_free(ssh1_challenge);
1243: ssh1_challenge = NULL;
1244: monitor_reset_key_state();
1245:
1246: buffer_clear(m);
1247: buffer_put_int(m, success);
1248: mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1249:
1250: return (success);
1251: }
1.25 itojun 1252:
1253:
1254: #ifdef KRB5
1255: int
1256: mm_answer_krb5(int socket, Buffer *m)
1257: {
1258: krb5_data tkt, reply;
1259: char *client_user;
1260: u_int len;
1261: int success;
1262:
1263: /* use temporary var to avoid size issues on 64bit arch */
1264: tkt.data = buffer_get_string(m, &len);
1265: tkt.length = len;
1266:
1.27 ! markus 1267: success = (options.kerberos_authentication == 1) &&
! 1268: auth_krb5(authctxt, &tkt, &client_user, &reply);
1.25 itojun 1269:
1270: if (tkt.length)
1271: xfree(tkt.data);
1272:
1273: buffer_clear(m);
1274: buffer_put_int(m, success);
1275:
1276: if (success) {
1277: buffer_put_cstring(m, client_user);
1278: buffer_put_string(m, reply.data, reply.length);
1279: if (client_user)
1280: xfree(client_user);
1281: if (reply.length)
1282: xfree(reply.data);
1283: }
1284: mm_request_send(socket, MONITOR_ANS_KRB5, m);
1285:
1286: return success;
1287: }
1288: #endif
1.1 provos 1289:
1290: int
1291: mm_answer_term(int socket, Buffer *req)
1292: {
1.11 mouring 1293: extern struct monitor *pmonitor;
1.1 provos 1294: int res, status;
1295:
1.14 markus 1296: debug3("%s: tearing down sessions", __func__);
1.1 provos 1297:
1298: /* The child is terminating */
1299: session_destroy_all(&mm_session_close);
1300:
1.11 mouring 1301: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1302: if (errno != EINTR)
1303: exit(1);
1.1 provos 1304:
1305: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1306:
1307: /* Terminate process */
1308: exit (res);
1309: }
1310:
1311: void
1.11 mouring 1312: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1313: {
1314: if (compat20) {
1315: set_newkeys(MODE_IN);
1316: set_newkeys(MODE_OUT);
1317: } else {
1318: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1319: packet_set_encryption_key(child_state.ssh1key,
1320: child_state.ssh1keylen, child_state.ssh1cipher);
1321: xfree(child_state.ssh1key);
1.1 provos 1322: }
1323:
1.15 markus 1324: /* for rc4 and other stateful ciphers */
1.1 provos 1325: packet_set_keycontext(MODE_OUT, child_state.keyout);
1326: xfree(child_state.keyout);
1327: packet_set_keycontext(MODE_IN, child_state.keyin);
1328: xfree(child_state.keyin);
1329:
1330: if (!compat20) {
1331: packet_set_iv(MODE_OUT, child_state.ivout);
1332: xfree(child_state.ivout);
1333: packet_set_iv(MODE_IN, child_state.ivin);
1334: xfree(child_state.ivin);
1335: }
1336:
1337: memcpy(&incoming_stream, &child_state.incoming,
1338: sizeof(incoming_stream));
1339: memcpy(&outgoing_stream, &child_state.outgoing,
1340: sizeof(outgoing_stream));
1.3 markus 1341:
1.1 provos 1342: /* Update with new address */
1.16 djm 1343: if (options.compression)
1344: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1345:
1346: /* Network I/O buffers */
1347: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1348: buffer_clear(&input);
1349: buffer_append(&input, child_state.input, child_state.ilen);
1350: memset(child_state.input, 0, child_state.ilen);
1351: xfree(child_state.input);
1352:
1353: buffer_clear(&output);
1354: buffer_append(&output, child_state.output, child_state.olen);
1355: memset(child_state.output, 0, child_state.olen);
1356: xfree(child_state.output);
1357: }
1358:
1.2 markus 1359: static Kex *
1.1 provos 1360: mm_get_kex(Buffer *m)
1361: {
1362: Kex *kex;
1363: void *blob;
1364: u_int bloblen;
1365:
1366: kex = xmalloc(sizeof(*kex));
1367: memset(kex, 0, sizeof(*kex));
1368: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.13 markus 1369: if ((session_id2 == NULL) ||
1370: (kex->session_id_len != session_id2_len) ||
1371: (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1372: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1373: kex->we_need = buffer_get_int(m);
1374: kex->server = 1;
1375: kex->hostkey_type = buffer_get_int(m);
1376: kex->kex_type = buffer_get_int(m);
1377: blob = buffer_get_string(m, &bloblen);
1378: buffer_init(&kex->my);
1379: buffer_append(&kex->my, blob, bloblen);
1380: xfree(blob);
1381: blob = buffer_get_string(m, &bloblen);
1382: buffer_init(&kex->peer);
1383: buffer_append(&kex->peer, blob, bloblen);
1384: xfree(blob);
1385: kex->done = 1;
1386: kex->flags = buffer_get_int(m);
1387: kex->client_version_string = buffer_get_string(m, NULL);
1388: kex->server_version_string = buffer_get_string(m, NULL);
1389: kex->load_host_key=&get_hostkey_by_type;
1390: kex->host_key_index=&get_hostkey_index;
1391:
1392: return (kex);
1393: }
1394:
1395: /* This function requries careful sanity checking */
1396:
1397: void
1.11 mouring 1398: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1399: {
1400: Buffer m;
1401: u_char *blob, *p;
1402: u_int bloblen, plen;
1403:
1.14 markus 1404: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1405:
1406: buffer_init(&m);
1.11 mouring 1407: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1408: if (!compat20) {
1409: child_state.ssh1protoflags = buffer_get_int(&m);
1410: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1411: child_state.ssh1key = buffer_get_string(&m,
1412: &child_state.ssh1keylen);
1.1 provos 1413: child_state.ivout = buffer_get_string(&m,
1414: &child_state.ivoutlen);
1415: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1416: goto skip;
1417: } else {
1418: /* Get the Kex for rekeying */
1.11 mouring 1419: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1420: }
1421:
1422: blob = buffer_get_string(&m, &bloblen);
1423: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1424: xfree(blob);
1425:
1.14 markus 1426: debug3("%s: Waiting for second key", __func__);
1.1 provos 1427: blob = buffer_get_string(&m, &bloblen);
1428: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1429: xfree(blob);
1.3 markus 1430:
1.1 provos 1431: /* Now get sequence numbers for the packets */
1432: packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1433: packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1434:
1435: skip:
1436: /* Get the key context */
1437: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1438: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1439:
1.14 markus 1440: debug3("%s: Getting compression state", __func__);
1.1 provos 1441: /* Get compression state */
1442: p = buffer_get_string(&m, &plen);
1443: if (plen != sizeof(child_state.outgoing))
1.14 markus 1444: fatal("%s: bad request size", __func__);
1.1 provos 1445: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1446: xfree(p);
1447:
1448: p = buffer_get_string(&m, &plen);
1449: if (plen != sizeof(child_state.incoming))
1.14 markus 1450: fatal("%s: bad request size", __func__);
1.1 provos 1451: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1452: xfree(p);
1453:
1454: /* Network I/O buffers */
1.14 markus 1455: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1456: child_state.input = buffer_get_string(&m, &child_state.ilen);
1457: child_state.output = buffer_get_string(&m, &child_state.olen);
1458:
1459: buffer_free(&m);
1460: }
1461:
1462:
1463: /* Allocation functions for zlib */
1464: void *
1465: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1466: {
1.23 millert 1467: size_t len = size * ncount;
1.1 provos 1468: void *address;
1469:
1.23 millert 1470: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1471: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1472:
1473: address = mm_malloc(mm, len);
1.1 provos 1474:
1475: return (address);
1476: }
1477:
1478: void
1479: mm_zfree(struct mm_master *mm, void *address)
1480: {
1481: mm_free(mm, address);
1482: }
1483:
1484: void
1485: mm_init_compression(struct mm_master *mm)
1486: {
1487: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1488: outgoing_stream.zfree = (free_func)mm_zfree;
1489: outgoing_stream.opaque = mm;
1490:
1491: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1492: incoming_stream.zfree = (free_func)mm_zfree;
1493: incoming_stream.opaque = mm;
1494: }
1495:
1496: /* XXX */
1497:
1498: #define FD_CLOSEONEXEC(x) do { \
1499: if (fcntl(x, F_SETFD, 1) == -1) \
1500: fatal("fcntl(%d, F_SETFD)", x); \
1501: } while (0)
1502:
1.2 markus 1503: static void
1.1 provos 1504: monitor_socketpair(int *pair)
1.3 markus 1505: {
1.1 provos 1506: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.14 markus 1507: fatal("%s: socketpair", __func__);
1.1 provos 1508: FD_CLOSEONEXEC(pair[0]);
1509: FD_CLOSEONEXEC(pair[1]);
1510: }
1511:
1512: #define MM_MEMSIZE 65536
1513:
1514: struct monitor *
1515: monitor_init(void)
1516: {
1517: struct monitor *mon;
1518: int pair[2];
1519:
1520: mon = xmalloc(sizeof(*mon));
1521:
1522: monitor_socketpair(pair);
1523:
1524: mon->m_recvfd = pair[0];
1525: mon->m_sendfd = pair[1];
1526:
1527: /* Used to share zlib space across processes */
1.16 djm 1528: if (options.compression) {
1529: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1530: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1531:
1.16 djm 1532: /* Compression needs to share state across borders */
1533: mm_init_compression(mon->m_zlib);
1534: }
1.1 provos 1535:
1536: return mon;
1537: }
1538:
1539: void
1540: monitor_reinit(struct monitor *mon)
1541: {
1542: int pair[2];
1543:
1544: monitor_socketpair(pair);
1545:
1546: mon->m_recvfd = pair[0];
1547: mon->m_sendfd = pair[1];
1548: }
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