Annotation of src/usr.bin/ssh/monitor.c, Revision 1.9.2.1
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"
1.9.2.1 ! jason 28: RCSID("$OpenBSD: monitor.c,v 1.11 2002/05/15 15:47:49 mouring 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;
86: int ssh1cipher;
87: int ssh1protoflags;
88: u_char *input;
89: u_int ilen;
90: u_char *output;
91: u_int olen;
92: } child_state;
93:
94: /* Functions on the montior that answer unprivileged requests */
95:
96: int mm_answer_moduli(int, Buffer *);
97: int mm_answer_sign(int, Buffer *);
98: int mm_answer_pwnamallow(int, Buffer *);
1.9.2.1 ! jason 99: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 100: int mm_answer_authserv(int, Buffer *);
101: int mm_answer_authpassword(int, Buffer *);
102: int mm_answer_bsdauthquery(int, Buffer *);
103: int mm_answer_bsdauthrespond(int, Buffer *);
104: int mm_answer_skeyquery(int, Buffer *);
105: int mm_answer_skeyrespond(int, Buffer *);
106: int mm_answer_keyallowed(int, Buffer *);
107: int mm_answer_keyverify(int, Buffer *);
108: int mm_answer_pty(int, Buffer *);
109: int mm_answer_pty_cleanup(int, Buffer *);
110: int mm_answer_term(int, Buffer *);
111: int mm_answer_rsa_keyallowed(int, Buffer *);
112: int mm_answer_rsa_challenge(int, Buffer *);
113: int mm_answer_rsa_response(int, Buffer *);
114: int mm_answer_sesskey(int, Buffer *);
115: int mm_answer_sessid(int, Buffer *);
116:
117: static Authctxt *authctxt;
118: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
119:
120: /* local state for key verify */
121: static u_char *key_blob = NULL;
122: static u_int key_bloblen = 0;
123: static int key_blobtype = MM_NOKEY;
124: static u_char *hostbased_cuser = NULL;
125: static u_char *hostbased_chost = NULL;
126: static char *auth_method = "unknown";
127:
128: struct mon_table {
129: enum monitor_reqtype type;
130: int flags;
131: int (*f)(int, Buffer *);
132: };
133:
134: #define MON_ISAUTH 0x0004 /* Required for Authentication */
135: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
136: #define MON_ONCE 0x0010 /* Disable after calling */
137:
138: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
139:
140: #define MON_PERMIT 0x1000 /* Request is permitted */
141:
142: struct mon_table mon_dispatch_proto20[] = {
143: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
144: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
145: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
146: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.9.2.1 ! jason 147: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 148: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
149: #ifdef BSD_AUTH
150: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
151: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
152: #endif
153: #ifdef SKEY
154: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
155: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
156: #endif
157: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
158: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
159: {0, 0, NULL}
160: };
161:
162: struct mon_table mon_dispatch_postauth20[] = {
163: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
164: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
165: {MONITOR_REQ_PTY, 0, mm_answer_pty},
166: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
167: {MONITOR_REQ_TERM, 0, mm_answer_term},
168: {0, 0, NULL}
169: };
170:
171: struct mon_table mon_dispatch_proto15[] = {
172: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
173: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
174: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
175: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
176: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
177: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
178: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
179: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
180: #ifdef BSD_AUTH
181: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
182: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
183: #endif
184: #ifdef SKEY
185: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
186: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
187: #endif
188: {0, 0, NULL}
189: };
190:
191: struct mon_table mon_dispatch_postauth15[] = {
192: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
193: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
194: {MONITOR_REQ_TERM, 0, mm_answer_term},
195: {0, 0, NULL}
196: };
197:
198: struct mon_table *mon_dispatch;
199:
200: /* Specifies if a certain message is allowed at the moment */
201:
202: static void
203: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
204: {
205: while (ent->f != NULL) {
206: if (ent->type == type) {
207: ent->flags &= ~MON_PERMIT;
208: ent->flags |= permit ? MON_PERMIT : 0;
209: return;
210: }
211: ent++;
212: }
213: }
214:
215: static void
216: monitor_permit_authentications(int permit)
217: {
218: struct mon_table *ent = mon_dispatch;
219:
220: while (ent->f != NULL) {
221: if (ent->flags & MON_AUTH) {
222: ent->flags &= ~MON_PERMIT;
223: ent->flags |= permit ? MON_PERMIT : 0;
224: }
225: ent++;
226: }
227: }
228:
229: Authctxt *
1.9.2.1 ! jason 230: monitor_child_preauth(struct monitor *pmonitor)
1.1 provos 231: {
232: struct mon_table *ent;
233: int authenticated = 0;
234:
235: debug3("preauth child monitor started");
236:
237: if (compat20) {
238: mon_dispatch = mon_dispatch_proto20;
239:
240: /* Permit requests for moduli and signatures */
241: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
242: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
243: } else {
244: mon_dispatch = mon_dispatch_proto15;
245:
246: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
247: }
248:
249: authctxt = authctxt_new();
250:
251: /* The first few requests do not require asynchronous access */
252: while (!authenticated) {
1.9.2.1 ! jason 253: authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
1.1 provos 254: if (authenticated) {
255: if (!(ent->flags & MON_AUTHDECIDE))
256: fatal("%s: unexpected authentication from %d",
257: __FUNCTION__, ent->type);
258: if (authctxt->pw->pw_uid == 0 &&
259: !auth_root_allowed(auth_method))
260: authenticated = 0;
261: }
262:
263: if (ent->flags & MON_AUTHDECIDE) {
264: auth_log(authctxt, authenticated, auth_method,
265: compat20 ? " ssh2" : "");
266: if (!authenticated)
267: authctxt->failures++;
268: }
269: }
270:
271: if (!authctxt->valid)
272: fatal("%s: authenticated invalid user", __FUNCTION__);
273:
274: debug("%s: %s has been authenticated by privileged process",
275: __FUNCTION__, authctxt->user);
276:
1.9.2.1 ! jason 277: mm_get_keystate(pmonitor);
1.1 provos 278:
279: return (authctxt);
280: }
281:
282: void
1.9.2.1 ! jason 283: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 284: {
285: if (compat20) {
286: mon_dispatch = mon_dispatch_postauth20;
287:
288: /* Permit requests for moduli and signatures */
289: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
290: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
291: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
292:
293: } else {
294: mon_dispatch = mon_dispatch_postauth15;
295: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
296: }
297: if (!no_pty_flag) {
298: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
299: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
300: }
301:
302: for (;;)
1.9.2.1 ! jason 303: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 304: }
305:
306: void
1.9.2.1 ! jason 307: monitor_sync(struct monitor *pmonitor)
1.1 provos 308: {
309: /* The member allocation is not visible, so sync it */
1.9.2.1 ! jason 310: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
1.1 provos 311: }
312:
313: int
1.9.2.1 ! jason 314: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 315: struct mon_table **pent)
316: {
317: Buffer m;
318: int ret;
319: u_char type;
320:
321: buffer_init(&m);
322:
1.9.2.1 ! jason 323: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 324: type = buffer_get_char(&m);
325:
326: debug3("%s: checking request %d", __FUNCTION__, type);
327:
328: while (ent->f != NULL) {
329: if (ent->type == type)
330: break;
331: ent++;
332: }
333:
334: if (ent->f != NULL) {
335: if (!(ent->flags & MON_PERMIT))
336: fatal("%s: unpermitted request %d", __FUNCTION__,
337: type);
1.9.2.1 ! jason 338: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 339: buffer_free(&m);
340:
341: /* The child may use this request only once, disable it */
342: if (ent->flags & MON_ONCE) {
343: debug2("%s: %d used once, disabling now", __FUNCTION__,
344: type);
345: ent->flags &= ~MON_PERMIT;
346: }
347:
348: if (pent != NULL)
349: *pent = ent;
1.3 markus 350:
1.1 provos 351: return ret;
352: }
353:
1.7 stevesk 354: fatal("%s: unsupported request: %d", __FUNCTION__, type);
1.1 provos 355:
356: /* NOTREACHED */
357: return (-1);
358: }
359:
360: /* allowed key state */
361: static int
362: monitor_allowed_key(u_char *blob, u_int bloblen)
363: {
364: /* make sure key is allowed */
365: if (key_blob == NULL || key_bloblen != bloblen ||
366: memcmp(key_blob, blob, key_bloblen))
367: return (0);
368: return (1);
369: }
370:
371: static void
372: monitor_reset_key_state(void)
373: {
374: /* reset state */
375: if (key_blob != NULL)
376: xfree(key_blob);
377: if (hostbased_cuser != NULL)
378: xfree(hostbased_cuser);
379: if (hostbased_chost != NULL)
380: xfree(hostbased_chost);
381: key_blob = NULL;
382: key_bloblen = 0;
383: key_blobtype = MM_NOKEY;
384: hostbased_cuser = NULL;
385: hostbased_chost = NULL;
386: }
387:
388: int
389: mm_answer_moduli(int socket, Buffer *m)
390: {
391: DH *dh;
392: int min, want, max;
393:
394: min = buffer_get_int(m);
395: want = buffer_get_int(m);
396: max = buffer_get_int(m);
397:
398: debug3("%s: got parameters: %d %d %d",
399: __FUNCTION__, min, want, max);
400: /* We need to check here, too, in case the child got corrupted */
401: if (max < min || want < min || max < want)
402: fatal("%s: bad parameters: %d %d %d",
403: __FUNCTION__, min, want, max);
404:
405: buffer_clear(m);
406:
407: dh = choose_dh(min, want, max);
408: if (dh == NULL) {
409: buffer_put_char(m, 0);
410: return (0);
411: } else {
412: /* Send first bignum */
413: buffer_put_char(m, 1);
414: buffer_put_bignum2(m, dh->p);
415: buffer_put_bignum2(m, dh->g);
1.3 markus 416:
1.1 provos 417: DH_free(dh);
418: }
419: mm_request_send(socket, MONITOR_ANS_MODULI, m);
420: return (0);
421: }
422:
423: int
424: mm_answer_sign(int socket, Buffer *m)
425: {
426: Key *key;
427: u_char *p;
428: u_char *signature;
429: u_int siglen, datlen;
430: int keyid;
1.3 markus 431:
1.1 provos 432: debug3("%s", __FUNCTION__);
433:
1.3 markus 434: keyid = buffer_get_int(m);
435: p = buffer_get_string(m, &datlen);
1.1 provos 436:
437: if (datlen != 20)
438: fatal("%s: data length incorrect: %d", __FUNCTION__, datlen);
439:
440: if ((key = get_hostkey_by_index(keyid)) == NULL)
441: fatal("%s: no hostkey from index %d", __FUNCTION__, keyid);
442: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
443: fatal("%s: key_sign failed", __FUNCTION__);
444:
445: debug3("%s: signature %p(%d)", __FUNCTION__, signature, siglen);
446:
447: buffer_clear(m);
448: buffer_put_string(m, signature, siglen);
449:
450: xfree(p);
451: xfree(signature);
452:
453: mm_request_send(socket, MONITOR_ANS_SIGN, m);
454:
455: /* Turn on permissions for getpwnam */
456: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
457:
458: return (0);
459: }
460:
461: /* Retrieves the password entry and also checks if the user is permitted */
462:
463: int
464: mm_answer_pwnamallow(int socket, Buffer *m)
465: {
466: char *login;
467: struct passwd *pwent;
468: int allowed = 0;
1.3 markus 469:
1.1 provos 470: debug3("%s", __FUNCTION__);
471:
472: if (authctxt->attempt++ != 0)
473: fatal("%s: multiple attempts for getpwnam", __FUNCTION__);
474:
475: login = buffer_get_string(m, NULL);
476:
477: pwent = getpwnamallow(login);
478:
479: authctxt->user = xstrdup(login);
480: setproctitle("%s [priv]", pwent ? login : "unknown");
481: xfree(login);
482:
483: buffer_clear(m);
484:
485: if (pwent == NULL) {
486: buffer_put_char(m, 0);
487: goto out;
488: }
489:
490: allowed = 1;
1.4 markus 491: authctxt->pw = pwent;
1.1 provos 492: authctxt->valid = 1;
493:
494: buffer_put_char(m, 1);
495: buffer_put_string(m, pwent, sizeof(struct passwd));
496: buffer_put_cstring(m, pwent->pw_name);
497: buffer_put_cstring(m, "*");
498: buffer_put_cstring(m, pwent->pw_gecos);
499: buffer_put_cstring(m, pwent->pw_class);
500: buffer_put_cstring(m, pwent->pw_dir);
501: buffer_put_cstring(m, pwent->pw_shell);
502:
503: out:
504: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __FUNCTION__, allowed);
505: mm_request_send(socket, MONITOR_ANS_PWNAM, m);
506:
507: /* For SSHv1 allow authentication now */
508: if (!compat20)
509: monitor_permit_authentications(1);
1.9.2.1 ! jason 510: else {
1.1 provos 511: /* Allow service/style information on the auth context */
512: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.9.2.1 ! jason 513: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
! 514: }
! 515:
! 516:
! 517: return (0);
! 518: }
! 519:
! 520: int mm_answer_auth2_read_banner(int socket, Buffer *m)
! 521: {
! 522: char *banner;
! 523:
! 524: buffer_clear(m);
! 525: banner = auth2_read_banner();
! 526: buffer_put_cstring(m, banner != NULL ? banner : "");
! 527: mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.1 provos 528:
1.9.2.1 ! jason 529: if (banner != NULL)
! 530: free(banner);
1.1 provos 531:
532: return (0);
533: }
534:
535: int
536: mm_answer_authserv(int socket, Buffer *m)
537: {
538: monitor_permit_authentications(1);
539:
540: authctxt->service = buffer_get_string(m, NULL);
541: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 542: debug3("%s: service=%s, style=%s",
543: __FUNCTION__, authctxt->service, authctxt->style);
544:
1.1 provos 545: if (strlen(authctxt->style) == 0) {
546: xfree(authctxt->style);
547: authctxt->style = NULL;
548: }
549:
550: return (0);
551: }
552:
553: int
554: mm_answer_authpassword(int socket, Buffer *m)
555: {
556: static int call_count;
557: char *passwd;
558: int authenticated, plen;
559:
560: passwd = buffer_get_string(m, &plen);
561: /* Only authenticate if the context is valid */
562: authenticated = authctxt->valid && auth_password(authctxt, passwd);
563: memset(passwd, 0, strlen(passwd));
564: xfree(passwd);
565:
566: buffer_clear(m);
567: buffer_put_int(m, authenticated);
568:
569: debug3("%s: sending result %d", __FUNCTION__, authenticated);
570: mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
571:
572: call_count++;
573: if (plen == 0 && call_count == 1)
574: auth_method = "none";
575: else
576: auth_method = "password";
577:
578: /* Causes monitor loop to terminate if authenticated */
579: return (authenticated);
580: }
581:
582: #ifdef BSD_AUTH
583: int
584: mm_answer_bsdauthquery(int socket, Buffer *m)
585: {
586: char *name, *infotxt;
587: u_int numprompts;
588: u_int *echo_on;
589: char **prompts;
590: int res;
591:
592: res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
593: &prompts, &echo_on);
594:
595: buffer_clear(m);
596: buffer_put_int(m, res);
597: if (res != -1)
598: buffer_put_cstring(m, prompts[0]);
599:
600: debug3("%s: sending challenge res: %d", __FUNCTION__, res);
601: mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
602:
603: if (res != -1) {
604: xfree(name);
605: xfree(infotxt);
606: xfree(prompts);
607: xfree(echo_on);
608: }
609:
610: return (0);
611: }
612:
613: int
614: mm_answer_bsdauthrespond(int socket, Buffer *m)
615: {
616: char *response;
617: int authok;
618:
619: if (authctxt->as == 0)
620: fatal("%s: no bsd auth session", __FUNCTION__);
621:
622: response = buffer_get_string(m, NULL);
623: authok = auth_userresponse(authctxt->as, response, 0);
624: authctxt->as = NULL;
625: debug3("%s: <%s> = <%d>", __FUNCTION__, response, authok);
626: xfree(response);
627:
628: buffer_clear(m);
629: buffer_put_int(m, authok);
630:
631: debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
632: mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
633:
634: auth_method = "bsdauth";
635:
636: return (authok != 0);
637: }
638: #endif
639:
640: #ifdef SKEY
641: int
642: mm_answer_skeyquery(int socket, Buffer *m)
643: {
644: struct skey skey;
645: char challenge[1024];
646: int res;
647:
648: res = skeychallenge(&skey, authctxt->user, challenge);
649:
650: buffer_clear(m);
651: buffer_put_int(m, res);
652: if (res != -1)
653: buffer_put_cstring(m, challenge);
654:
655: debug3("%s: sending challenge res: %d", __FUNCTION__, res);
656: mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
657:
658: return (0);
659: }
660:
661: int
662: mm_answer_skeyrespond(int socket, Buffer *m)
663: {
664: char *response;
665: int authok;
666:
667: response = buffer_get_string(m, NULL);
668:
669: authok = (authctxt->valid &&
670: skey_haskey(authctxt->pw->pw_name) == 0 &&
671: skey_passcheck(authctxt->pw->pw_name, response) != -1);
672:
673: xfree(response);
674:
675: buffer_clear(m);
676: buffer_put_int(m, authok);
677:
678: debug3("%s: sending authenticated: %d", __FUNCTION__, authok);
679: mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
680:
681: auth_method = "skey";
682:
683: return (authok != 0);
684: }
685: #endif
686:
1.2 markus 687: static void
1.1 provos 688: mm_append_debug(Buffer *m)
689: {
690: if (auth_debug_init && buffer_len(&auth_debug)) {
691: debug3("%s: Appending debug messages for child", __FUNCTION__);
692: buffer_append(m, buffer_ptr(&auth_debug),
693: buffer_len(&auth_debug));
694: buffer_clear(&auth_debug);
695: }
696: }
697:
698: int
699: mm_answer_keyallowed(int socket, Buffer *m)
700: {
701: Key *key;
702: u_char *cuser, *chost, *blob;
703: u_int bloblen;
704: enum mm_keytype type = 0;
705: int allowed = 0;
706:
707: debug3("%s entering", __FUNCTION__);
1.3 markus 708:
1.1 provos 709: type = buffer_get_int(m);
710: cuser = buffer_get_string(m, NULL);
711: chost = buffer_get_string(m, NULL);
712: blob = buffer_get_string(m, &bloblen);
713:
714: key = key_from_blob(blob, bloblen);
715:
716: if ((compat20 && type == MM_RSAHOSTKEY) ||
717: (!compat20 && type != MM_RSAHOSTKEY))
718: fatal("%s: key type and protocol mismatch", __FUNCTION__);
719:
720: debug3("%s: key_from_blob: %p", __FUNCTION__, key);
721:
722: if (key != NULL && authctxt->pw != NULL) {
723: switch(type) {
724: case MM_USERKEY:
725: allowed = user_key_allowed(authctxt->pw, key);
726: break;
727: case MM_HOSTKEY:
728: allowed = hostbased_key_allowed(authctxt->pw,
729: cuser, chost, key);
730: break;
731: case MM_RSAHOSTKEY:
732: key->type = KEY_RSA1; /* XXX */
733: allowed = auth_rhosts_rsa_key_allowed(authctxt->pw,
734: cuser, chost, key);
735: break;
736: default:
737: fatal("%s: unknown key type %d", __FUNCTION__, type);
738: break;
739: }
740: key_free(key);
741: }
742:
743: /* clear temporarily storage (used by verify) */
744: monitor_reset_key_state();
745:
746: if (allowed) {
747: /* Save temporarily for comparison in verify */
748: key_blob = blob;
749: key_bloblen = bloblen;
750: key_blobtype = type;
751: hostbased_cuser = cuser;
752: hostbased_chost = chost;
753: }
754:
755: debug3("%s: key %p is %s",
756: __FUNCTION__, key, allowed ? "allowed" : "disallowed");
757:
758: buffer_clear(m);
759: buffer_put_int(m, allowed);
760:
761: mm_append_debug(m);
762:
763: mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
764:
765: if (type == MM_RSAHOSTKEY)
766: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
767:
768: return (0);
769: }
770:
771: static int
772: monitor_valid_userblob(u_char *data, u_int datalen)
773: {
774: Buffer b;
775: u_char *p;
776: u_int len;
777: int fail = 0;
778: int session_id2_len = 20 /*XXX should get from [net] */;
779:
780: buffer_init(&b);
781: buffer_append(&b, data, datalen);
1.3 markus 782:
1.1 provos 783: if (datafellows & SSH_OLD_SESSIONID) {
784: buffer_consume(&b, session_id2_len);
785: } else {
786: xfree(buffer_get_string(&b, &len));
787: if (len != session_id2_len)
788: fail++;
789: }
790: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
791: fail++;
792: p = buffer_get_string(&b, NULL);
793: if (strcmp(authctxt->user, p) != 0) {
794: log("wrong user name passed to monitor: expected %s != %.100s",
795: authctxt->user, p);
796: fail++;
797: }
798: xfree(p);
799: buffer_skip_string(&b);
800: if (datafellows & SSH_BUG_PKAUTH) {
801: if (!buffer_get_char(&b))
802: fail++;
803: } else {
804: p = buffer_get_string(&b, NULL);
805: if (strcmp("publickey", p) != 0)
806: fail++;
807: xfree(p);
808: if (!buffer_get_char(&b))
809: fail++;
810: buffer_skip_string(&b);
811: }
812: buffer_skip_string(&b);
813: if (buffer_len(&b) != 0)
814: fail++;
815: buffer_free(&b);
816: return (fail == 0);
817: }
818:
819: static int
820: monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
821: u_char *chost)
822: {
823: Buffer b;
824: u_char *p;
825: u_int len;
826: int fail = 0;
827: int session_id2_len = 20 /*XXX should get from [net] */;
828:
829: buffer_init(&b);
830: buffer_append(&b, data, datalen);
1.3 markus 831:
1.1 provos 832: xfree(buffer_get_string(&b, &len));
833: if (len != session_id2_len)
834: fail++;
835: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
836: fail++;
837: p = buffer_get_string(&b, NULL);
838: if (strcmp(authctxt->user, p) != 0) {
839: log("wrong user name passed to monitor: expected %s != %.100s",
840: authctxt->user, p);
841: fail++;
842: }
843: xfree(p);
844: buffer_skip_string(&b); /* service */
845: p = buffer_get_string(&b, NULL);
846: if (strcmp(p, "hostbased") != 0)
847: fail++;
848: xfree(p);
849: buffer_skip_string(&b); /* pkalg */
850: buffer_skip_string(&b); /* pkblob */
851:
852: /* verify client host, strip trailing dot if necessary */
853: p = buffer_get_string(&b, NULL);
854: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
855: p[len - 1] = '\0';
856: if (strcmp(p, chost) != 0)
857: fail++;
858: xfree(p);
859:
860: /* verify client user */
861: p = buffer_get_string(&b, NULL);
862: if (strcmp(p, cuser) != 0)
863: fail++;
864: xfree(p);
865:
866: if (buffer_len(&b) != 0)
867: fail++;
868: buffer_free(&b);
869: return (fail == 0);
870: }
871:
872: int
873: mm_answer_keyverify(int socket, Buffer *m)
874: {
875: Key *key;
876: u_char *signature, *data, *blob;
877: u_int signaturelen, datalen, bloblen;
878: int verified = 0;
879: int valid_data = 0;
880:
881: blob = buffer_get_string(m, &bloblen);
882: signature = buffer_get_string(m, &signaturelen);
883: data = buffer_get_string(m, &datalen);
884:
885: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 886: !monitor_allowed_key(blob, bloblen))
1.1 provos 887: fatal("%s: bad key, not previously allowed", __FUNCTION__);
888:
889: key = key_from_blob(blob, bloblen);
890: if (key == NULL)
891: fatal("%s: bad public key blob", __FUNCTION__);
892:
893: switch (key_blobtype) {
894: case MM_USERKEY:
895: valid_data = monitor_valid_userblob(data, datalen);
896: break;
897: case MM_HOSTKEY:
898: valid_data = monitor_valid_hostbasedblob(data, datalen,
899: hostbased_cuser, hostbased_chost);
900: break;
901: default:
902: valid_data = 0;
903: break;
904: }
905: if (!valid_data)
906: fatal("%s: bad signature data blob", __FUNCTION__);
907:
908: verified = key_verify(key, signature, signaturelen, data, datalen);
909: debug3("%s: key %p signature %s",
910: __FUNCTION__, key, verified ? "verified" : "unverified");
911:
912: key_free(key);
913: xfree(blob);
914: xfree(signature);
915: xfree(data);
916:
917: monitor_reset_key_state();
1.3 markus 918:
1.1 provos 919: buffer_clear(m);
920: buffer_put_int(m, verified);
921: mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
922:
923: auth_method = "publickey";
924:
925: return (verified);
926: }
927:
1.2 markus 928: static void
1.1 provos 929: mm_record_login(Session *s, struct passwd *pw)
930: {
931: socklen_t fromlen;
932: struct sockaddr_storage from;
933:
934: /*
935: * Get IP address of client. If the connection is not a socket, let
936: * the address be 0.0.0.0.
937: */
938: memset(&from, 0, sizeof(from));
939: if (packet_connection_is_on_socket()) {
940: fromlen = sizeof(from);
941: if (getpeername(packet_get_connection_in(),
942: (struct sockaddr *) & from, &fromlen) < 0) {
943: debug("getpeername: %.100s", strerror(errno));
944: fatal_cleanup();
945: }
946: }
947: /* Record that there was a login on that tty from the remote host. */
948: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
949: get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
950: (struct sockaddr *)&from);
951: }
952:
953: static void
954: mm_session_close(Session *s)
955: {
956: debug3("%s: session %d pid %d", __FUNCTION__, s->self, s->pid);
957: if (s->ttyfd != -1) {
958: debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ptyfd);
959: fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
960: session_pty_cleanup2(s);
961: }
962: s->used = 0;
963: }
964:
965: int
966: mm_answer_pty(int socket, Buffer *m)
967: {
1.9.2.1 ! jason 968: extern struct monitor *pmonitor;
1.1 provos 969: Session *s;
970: int res, fd0;
971:
972: debug3("%s entering", __FUNCTION__);
973:
974: buffer_clear(m);
975: s = session_new();
976: if (s == NULL)
977: goto error;
978: s->authctxt = authctxt;
979: s->pw = authctxt->pw;
1.9.2.1 ! jason 980: s->pid = pmonitor->m_pid;
1.1 provos 981: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
982: if (res == 0)
983: goto error;
984: fatal_add_cleanup(session_pty_cleanup2, (void *)s);
985: pty_setowner(authctxt->pw, s->tty);
986:
987: buffer_put_int(m, 1);
988: buffer_put_cstring(m, s->tty);
989: mm_request_send(socket, MONITOR_ANS_PTY, m);
990:
991: mm_send_fd(socket, s->ptyfd);
992: mm_send_fd(socket, s->ttyfd);
993:
994: /* We need to trick ttyslot */
995: if (dup2(s->ttyfd, 0) == -1)
996: fatal("%s: dup2", __FUNCTION__);
997:
998: mm_record_login(s, authctxt->pw);
999:
1000: /* Now we can close the file descriptor again */
1001: close(0);
1002:
1003: /* make sure nothing uses fd 0 */
1004: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1005: fatal("%s: open(/dev/null): %s", __FUNCTION__, strerror(errno));
1006: if (fd0 != 0)
1007: error("%s: fd0 %d != 0", __FUNCTION__, fd0);
1008:
1009: /* slave is not needed */
1010: close(s->ttyfd);
1011: s->ttyfd = s->ptyfd;
1012: /* no need to dup() because nobody closes ptyfd */
1013: s->ptymaster = s->ptyfd;
1014:
1015: debug3("%s: tty %s ptyfd %d", __FUNCTION__, s->tty, s->ttyfd);
1016:
1017: return (0);
1018:
1019: error:
1020: if (s != NULL)
1021: mm_session_close(s);
1022: buffer_put_int(m, 0);
1023: mm_request_send(socket, MONITOR_ANS_PTY, m);
1024: return (0);
1025: }
1026:
1027: int
1028: mm_answer_pty_cleanup(int socket, Buffer *m)
1029: {
1030: Session *s;
1031: char *tty;
1032:
1033: debug3("%s entering", __FUNCTION__);
1034:
1035: tty = buffer_get_string(m, NULL);
1036: if ((s = session_by_tty(tty)) != NULL)
1037: mm_session_close(s);
1038: buffer_clear(m);
1039: xfree(tty);
1040: return (0);
1041: }
1042:
1043: int
1044: mm_answer_sesskey(int socket, Buffer *m)
1045: {
1046: BIGNUM *p;
1047: int rsafail;
1048:
1049: /* Turn off permissions */
1050: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1051:
1052: if ((p = BN_new()) == NULL)
1053: fatal("%s: BN_new", __FUNCTION__);
1054:
1055: buffer_get_bignum2(m, p);
1056:
1057: rsafail = ssh1_session_key(p);
1058:
1059: buffer_clear(m);
1060: buffer_put_int(m, rsafail);
1061: buffer_put_bignum2(m, p);
1062:
1063: BN_clear_free(p);
1064:
1065: mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1066:
1067: /* Turn on permissions for sessid passing */
1068: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1069:
1070: return (0);
1071: }
1072:
1073: int
1074: mm_answer_sessid(int socket, Buffer *m)
1075: {
1076: int i;
1077:
1078: debug3("%s entering", __FUNCTION__);
1079:
1080: if (buffer_len(m) != 16)
1081: fatal("%s: bad ssh1 session id", __FUNCTION__);
1082: for (i = 0; i < 16; i++)
1083: session_id[i] = buffer_get_char(m);
1084:
1085: /* Turn on permissions for getpwnam */
1086: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1087:
1088: return (0);
1089: }
1090:
1091: int
1092: mm_answer_rsa_keyallowed(int socket, Buffer *m)
1093: {
1094: BIGNUM *client_n;
1095: Key *key = NULL;
1.3 markus 1096: u_char *blob = NULL;
1097: u_int blen = 0;
1.1 provos 1098: int allowed = 0;
1099:
1100: debug3("%s entering", __FUNCTION__);
1101:
1102: if (authctxt->valid) {
1103: if ((client_n = BN_new()) == NULL)
1104: fatal("%s: BN_new", __FUNCTION__);
1105: buffer_get_bignum2(m, client_n);
1106: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1107: BN_clear_free(client_n);
1108: }
1109: buffer_clear(m);
1110: buffer_put_int(m, allowed);
1111:
1112: /* clear temporarily storage (used by generate challenge) */
1113: monitor_reset_key_state();
1114:
1115: if (allowed && key != NULL) {
1116: key->type = KEY_RSA; /* cheat for key_to_blob */
1117: if (key_to_blob(key, &blob, &blen) == 0)
1118: fatal("%s: key_to_blob failed", __FUNCTION__);
1119: buffer_put_string(m, blob, blen);
1120:
1121: /* Save temporarily for comparison in verify */
1122: key_blob = blob;
1123: key_bloblen = blen;
1124: key_blobtype = MM_RSAUSERKEY;
1125: key_free(key);
1126: }
1127:
1128: mm_append_debug(m);
1129:
1130: mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1131:
1132: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1133: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1134: return (0);
1135: }
1136:
1137: int
1138: mm_answer_rsa_challenge(int socket, Buffer *m)
1139: {
1140: Key *key = NULL;
1.3 markus 1141: u_char *blob;
1142: u_int blen;
1.1 provos 1143:
1144: debug3("%s entering", __FUNCTION__);
1145:
1146: if (!authctxt->valid)
1147: fatal("%s: authctxt not valid", __FUNCTION__);
1148: blob = buffer_get_string(m, &blen);
1149: if (!monitor_allowed_key(blob, blen))
1150: fatal("%s: bad key, not previously allowed", __FUNCTION__);
1151: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1152: fatal("%s: key type mismatch", __FUNCTION__);
1153: if ((key = key_from_blob(blob, blen)) == NULL)
1154: fatal("%s: received bad key", __FUNCTION__);
1155:
1156: if (ssh1_challenge)
1157: BN_clear_free(ssh1_challenge);
1158: ssh1_challenge = auth_rsa_generate_challenge(key);
1159:
1160: buffer_clear(m);
1161: buffer_put_bignum2(m, ssh1_challenge);
1162:
1163: debug3("%s sending reply", __FUNCTION__);
1164: mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1165:
1166: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1167: return (0);
1168: }
1169:
1170: int
1171: mm_answer_rsa_response(int socket, Buffer *m)
1172: {
1173: Key *key = NULL;
1.3 markus 1174: u_char *blob, *response;
1175: u_int blen, len;
1176: int success;
1.1 provos 1177:
1178: debug3("%s entering", __FUNCTION__);
1179:
1180: if (!authctxt->valid)
1181: fatal("%s: authctxt not valid", __FUNCTION__);
1182: if (ssh1_challenge == NULL)
1183: fatal("%s: no ssh1_challenge", __FUNCTION__);
1184:
1185: blob = buffer_get_string(m, &blen);
1186: if (!monitor_allowed_key(blob, blen))
1187: fatal("%s: bad key, not previously allowed", __FUNCTION__);
1188: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1189: fatal("%s: key type mismatch: %d", __FUNCTION__, key_blobtype);
1190: if ((key = key_from_blob(blob, blen)) == NULL)
1191: fatal("%s: received bad key", __FUNCTION__);
1192: response = buffer_get_string(m, &len);
1193: if (len != 16)
1194: fatal("%s: received bad response to challenge", __FUNCTION__);
1195: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1196:
1197: key_free(key);
1198: xfree(response);
1199:
1200: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1201:
1202: /* reset state */
1203: BN_clear_free(ssh1_challenge);
1204: ssh1_challenge = NULL;
1205: monitor_reset_key_state();
1206:
1207: buffer_clear(m);
1208: buffer_put_int(m, success);
1209: mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1210:
1211: return (success);
1212: }
1213:
1214: int
1215: mm_answer_term(int socket, Buffer *req)
1216: {
1.9.2.1 ! jason 1217: extern struct monitor *pmonitor;
1.1 provos 1218: int res, status;
1219:
1220: debug3("%s: tearing down sessions", __FUNCTION__);
1221:
1222: /* The child is terminating */
1223: session_destroy_all(&mm_session_close);
1224:
1.9.2.1 ! jason 1225: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1226: if (errno != EINTR)
1227: exit(1);
1.1 provos 1228:
1229: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1230:
1231: /* Terminate process */
1232: exit (res);
1233: }
1234:
1235: void
1.9.2.1 ! jason 1236: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1237: {
1238: if (compat20) {
1239: set_newkeys(MODE_IN);
1240: set_newkeys(MODE_OUT);
1241: } else {
1.5 markus 1242: u_char key[SSH_SESSION_KEY_LENGTH];
1243:
1244: memset(key, 'a', sizeof(key));
1.1 provos 1245: packet_set_protocol_flags(child_state.ssh1protoflags);
1246: packet_set_encryption_key(key, SSH_SESSION_KEY_LENGTH,
1247: child_state.ssh1cipher);
1248: }
1249:
1250: packet_set_keycontext(MODE_OUT, child_state.keyout);
1251: xfree(child_state.keyout);
1252: packet_set_keycontext(MODE_IN, child_state.keyin);
1253: xfree(child_state.keyin);
1254:
1255: if (!compat20) {
1256: packet_set_iv(MODE_OUT, child_state.ivout);
1257: xfree(child_state.ivout);
1258: packet_set_iv(MODE_IN, child_state.ivin);
1259: xfree(child_state.ivin);
1260: }
1261:
1262: memcpy(&incoming_stream, &child_state.incoming,
1263: sizeof(incoming_stream));
1264: memcpy(&outgoing_stream, &child_state.outgoing,
1265: sizeof(outgoing_stream));
1.3 markus 1266:
1.1 provos 1267: /* Update with new address */
1.9.2.1 ! jason 1268: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1269:
1270: /* Network I/O buffers */
1271: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1272: buffer_clear(&input);
1273: buffer_append(&input, child_state.input, child_state.ilen);
1274: memset(child_state.input, 0, child_state.ilen);
1275: xfree(child_state.input);
1276:
1277: buffer_clear(&output);
1278: buffer_append(&output, child_state.output, child_state.olen);
1279: memset(child_state.output, 0, child_state.olen);
1280: xfree(child_state.output);
1281: }
1282:
1.2 markus 1283: static Kex *
1.1 provos 1284: mm_get_kex(Buffer *m)
1285: {
1286: Kex *kex;
1287: void *blob;
1288: u_int bloblen;
1289:
1290: kex = xmalloc(sizeof(*kex));
1291: memset(kex, 0, sizeof(*kex));
1292: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1293: kex->we_need = buffer_get_int(m);
1294: kex->server = 1;
1295: kex->hostkey_type = buffer_get_int(m);
1296: kex->kex_type = buffer_get_int(m);
1297: blob = buffer_get_string(m, &bloblen);
1298: buffer_init(&kex->my);
1299: buffer_append(&kex->my, blob, bloblen);
1300: xfree(blob);
1301: blob = buffer_get_string(m, &bloblen);
1302: buffer_init(&kex->peer);
1303: buffer_append(&kex->peer, blob, bloblen);
1304: xfree(blob);
1305: kex->done = 1;
1306: kex->flags = buffer_get_int(m);
1307: kex->client_version_string = buffer_get_string(m, NULL);
1308: kex->server_version_string = buffer_get_string(m, NULL);
1309: kex->load_host_key=&get_hostkey_by_type;
1310: kex->host_key_index=&get_hostkey_index;
1311:
1312: return (kex);
1313: }
1314:
1315: /* This function requries careful sanity checking */
1316:
1317: void
1.9.2.1 ! jason 1318: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1319: {
1320: Buffer m;
1321: u_char *blob, *p;
1322: u_int bloblen, plen;
1323:
1324: debug3("%s: Waiting for new keys", __FUNCTION__);
1325:
1326: buffer_init(&m);
1.9.2.1 ! jason 1327: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1328: if (!compat20) {
1329: child_state.ssh1protoflags = buffer_get_int(&m);
1330: child_state.ssh1cipher = buffer_get_int(&m);
1331: child_state.ivout = buffer_get_string(&m,
1332: &child_state.ivoutlen);
1333: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1334: goto skip;
1335: } else {
1336: /* Get the Kex for rekeying */
1.9.2.1 ! jason 1337: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1338: }
1339:
1340: blob = buffer_get_string(&m, &bloblen);
1341: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1342: xfree(blob);
1343:
1344: debug3("%s: Waiting for second key", __FUNCTION__);
1345: blob = buffer_get_string(&m, &bloblen);
1346: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1347: xfree(blob);
1.3 markus 1348:
1.1 provos 1349: /* Now get sequence numbers for the packets */
1350: packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1351: packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1352:
1353: skip:
1354: /* Get the key context */
1355: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1356: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1357:
1358: debug3("%s: Getting compression state", __FUNCTION__);
1359: /* Get compression state */
1360: p = buffer_get_string(&m, &plen);
1361: if (plen != sizeof(child_state.outgoing))
1362: fatal("%s: bad request size", __FUNCTION__);
1363: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1364: xfree(p);
1365:
1366: p = buffer_get_string(&m, &plen);
1367: if (plen != sizeof(child_state.incoming))
1368: fatal("%s: bad request size", __FUNCTION__);
1369: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1370: xfree(p);
1371:
1372: /* Network I/O buffers */
1373: debug3("%s: Getting Network I/O buffers", __FUNCTION__);
1374: child_state.input = buffer_get_string(&m, &child_state.ilen);
1375: child_state.output = buffer_get_string(&m, &child_state.olen);
1376:
1377: buffer_free(&m);
1378: }
1379:
1380:
1381: /* Allocation functions for zlib */
1382: void *
1383: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1384: {
1385: void *address;
1386:
1387: address = mm_malloc(mm, size * ncount);
1388:
1389: return (address);
1390: }
1391:
1392: void
1393: mm_zfree(struct mm_master *mm, void *address)
1394: {
1395: mm_free(mm, address);
1396: }
1397:
1398: void
1399: mm_init_compression(struct mm_master *mm)
1400: {
1401: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1402: outgoing_stream.zfree = (free_func)mm_zfree;
1403: outgoing_stream.opaque = mm;
1404:
1405: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1406: incoming_stream.zfree = (free_func)mm_zfree;
1407: incoming_stream.opaque = mm;
1408: }
1409:
1410: /* XXX */
1411:
1412: #define FD_CLOSEONEXEC(x) do { \
1413: if (fcntl(x, F_SETFD, 1) == -1) \
1414: fatal("fcntl(%d, F_SETFD)", x); \
1415: } while (0)
1416:
1.2 markus 1417: static void
1.1 provos 1418: monitor_socketpair(int *pair)
1.3 markus 1419: {
1.1 provos 1420: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1421: fatal("%s: socketpair", __FUNCTION__);
1422: FD_CLOSEONEXEC(pair[0]);
1423: FD_CLOSEONEXEC(pair[1]);
1424: }
1425:
1426: #define MM_MEMSIZE 65536
1427:
1428: struct monitor *
1429: monitor_init(void)
1430: {
1431: struct monitor *mon;
1432: int pair[2];
1433:
1434: mon = xmalloc(sizeof(*mon));
1435:
1436: monitor_socketpair(pair);
1437:
1438: mon->m_recvfd = pair[0];
1439: mon->m_sendfd = pair[1];
1440:
1441: /* Used to share zlib space across processes */
1442: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1443: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1444:
1445: /* Compression needs to share state across borders */
1446: mm_init_compression(mon->m_zlib);
1447:
1448: return mon;
1449: }
1450:
1451: void
1452: monitor_reinit(struct monitor *mon)
1453: {
1454: int pair[2];
1455:
1456: monitor_socketpair(pair);
1457:
1458: mon->m_recvfd = pair[0];
1459: mon->m_sendfd = pair[1];
1460: }
![[BACK]](/icons/back.gif){kind=icon}
Return to monitor.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh