Annotation of src/usr.bin/ssh/monitor.c, Revision 1.23
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"
1.23 ! millert 28: RCSID("$OpenBSD: monitor.c,v 1.22 2002/07/22 17:32:56 stevesk 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:
119: static Authctxt *authctxt;
120: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
121:
122: /* local state for key verify */
123: static u_char *key_blob = NULL;
124: static u_int key_bloblen = 0;
125: static int key_blobtype = MM_NOKEY;
126: static u_char *hostbased_cuser = NULL;
127: static u_char *hostbased_chost = NULL;
128: static char *auth_method = "unknown";
1.13 markus 129: static int session_id2_len = 0;
130: static u_char *session_id2 = NULL;
1.1 provos 131:
132: struct mon_table {
133: enum monitor_reqtype type;
134: int flags;
135: int (*f)(int, Buffer *);
136: };
137:
138: #define MON_ISAUTH 0x0004 /* Required for Authentication */
139: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
140: #define MON_ONCE 0x0010 /* Disable after calling */
141:
142: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
143:
144: #define MON_PERMIT 0x1000 /* Request is permitted */
145:
146: struct mon_table mon_dispatch_proto20[] = {
147: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
148: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
149: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
150: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 151: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 152: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
153: #ifdef BSD_AUTH
154: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
155: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
156: #endif
157: #ifdef SKEY
158: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
159: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
160: #endif
161: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
162: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
163: {0, 0, NULL}
164: };
165:
166: struct mon_table mon_dispatch_postauth20[] = {
167: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
168: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
169: {MONITOR_REQ_PTY, 0, mm_answer_pty},
170: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
171: {MONITOR_REQ_TERM, 0, mm_answer_term},
172: {0, 0, NULL}
173: };
174:
175: struct mon_table mon_dispatch_proto15[] = {
176: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
177: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
178: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
179: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
180: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed},
181: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
182: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
183: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
184: #ifdef BSD_AUTH
185: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
186: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond},
187: #endif
188: #ifdef SKEY
189: {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
190: {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
191: #endif
192: {0, 0, NULL}
193: };
194:
195: struct mon_table mon_dispatch_postauth15[] = {
196: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
197: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
198: {MONITOR_REQ_TERM, 0, mm_answer_term},
199: {0, 0, NULL}
200: };
201:
202: struct mon_table *mon_dispatch;
203:
204: /* Specifies if a certain message is allowed at the moment */
205:
206: static void
207: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
208: {
209: while (ent->f != NULL) {
210: if (ent->type == type) {
211: ent->flags &= ~MON_PERMIT;
212: ent->flags |= permit ? MON_PERMIT : 0;
213: return;
214: }
215: ent++;
216: }
217: }
218:
219: static void
220: monitor_permit_authentications(int permit)
221: {
222: struct mon_table *ent = mon_dispatch;
223:
224: while (ent->f != NULL) {
225: if (ent->flags & MON_AUTH) {
226: ent->flags &= ~MON_PERMIT;
227: ent->flags |= permit ? MON_PERMIT : 0;
228: }
229: ent++;
230: }
231: }
232:
233: Authctxt *
1.11 mouring 234: monitor_child_preauth(struct monitor *pmonitor)
1.1 provos 235: {
236: struct mon_table *ent;
237: int authenticated = 0;
238:
239: debug3("preauth child monitor started");
240:
241: if (compat20) {
242: mon_dispatch = mon_dispatch_proto20;
243:
244: /* Permit requests for moduli and signatures */
245: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
246: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
247: } else {
248: mon_dispatch = mon_dispatch_proto15;
249:
250: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
251: }
252:
253: authctxt = authctxt_new();
254:
255: /* The first few requests do not require asynchronous access */
256: while (!authenticated) {
1.11 mouring 257: authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
1.1 provos 258: if (authenticated) {
259: if (!(ent->flags & MON_AUTHDECIDE))
260: fatal("%s: unexpected authentication from %d",
1.14 markus 261: __func__, ent->type);
1.1 provos 262: if (authctxt->pw->pw_uid == 0 &&
263: !auth_root_allowed(auth_method))
264: authenticated = 0;
265: }
266:
267: if (ent->flags & MON_AUTHDECIDE) {
268: auth_log(authctxt, authenticated, auth_method,
269: compat20 ? " ssh2" : "");
270: if (!authenticated)
271: authctxt->failures++;
272: }
273: }
274:
275: if (!authctxt->valid)
1.14 markus 276: fatal("%s: authenticated invalid user", __func__);
1.1 provos 277:
278: debug("%s: %s has been authenticated by privileged process",
1.14 markus 279: __func__, authctxt->user);
1.1 provos 280:
1.11 mouring 281: mm_get_keystate(pmonitor);
1.1 provos 282:
283: return (authctxt);
284: }
285:
286: void
1.11 mouring 287: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 288: {
289: if (compat20) {
290: mon_dispatch = mon_dispatch_postauth20;
291:
292: /* Permit requests for moduli and signatures */
293: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
294: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
295: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
296:
297: } else {
298: mon_dispatch = mon_dispatch_postauth15;
299: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
300: }
301: if (!no_pty_flag) {
302: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
303: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
304: }
305:
306: for (;;)
1.11 mouring 307: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 308: }
309:
310: void
1.11 mouring 311: monitor_sync(struct monitor *pmonitor)
1.1 provos 312: {
1.16 djm 313: if (options.compression) {
314: /* The member allocation is not visible, so sync it */
315: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
316: }
1.1 provos 317: }
318:
319: int
1.11 mouring 320: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 321: struct mon_table **pent)
322: {
323: Buffer m;
324: int ret;
325: u_char type;
326:
327: buffer_init(&m);
328:
1.11 mouring 329: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 330: type = buffer_get_char(&m);
331:
1.14 markus 332: debug3("%s: checking request %d", __func__, type);
1.1 provos 333:
334: while (ent->f != NULL) {
335: if (ent->type == type)
336: break;
337: ent++;
338: }
339:
340: if (ent->f != NULL) {
341: if (!(ent->flags & MON_PERMIT))
1.14 markus 342: fatal("%s: unpermitted request %d", __func__,
1.1 provos 343: type);
1.11 mouring 344: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 345: buffer_free(&m);
346:
347: /* The child may use this request only once, disable it */
348: if (ent->flags & MON_ONCE) {
1.14 markus 349: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 350: type);
351: ent->flags &= ~MON_PERMIT;
352: }
353:
354: if (pent != NULL)
355: *pent = ent;
1.3 markus 356:
1.1 provos 357: return ret;
358: }
359:
1.14 markus 360: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 361:
362: /* NOTREACHED */
363: return (-1);
364: }
365:
366: /* allowed key state */
367: static int
368: monitor_allowed_key(u_char *blob, u_int bloblen)
369: {
370: /* make sure key is allowed */
371: if (key_blob == NULL || key_bloblen != bloblen ||
372: memcmp(key_blob, blob, key_bloblen))
373: return (0);
374: return (1);
375: }
376:
377: static void
378: monitor_reset_key_state(void)
379: {
380: /* reset state */
381: if (key_blob != NULL)
382: xfree(key_blob);
383: if (hostbased_cuser != NULL)
384: xfree(hostbased_cuser);
385: if (hostbased_chost != NULL)
386: xfree(hostbased_chost);
387: key_blob = NULL;
388: key_bloblen = 0;
389: key_blobtype = MM_NOKEY;
390: hostbased_cuser = NULL;
391: hostbased_chost = NULL;
392: }
393:
394: int
395: mm_answer_moduli(int socket, Buffer *m)
396: {
397: DH *dh;
398: int min, want, max;
399:
400: min = buffer_get_int(m);
401: want = buffer_get_int(m);
402: max = buffer_get_int(m);
403:
404: debug3("%s: got parameters: %d %d %d",
1.14 markus 405: __func__, min, want, max);
1.1 provos 406: /* We need to check here, too, in case the child got corrupted */
407: if (max < min || want < min || max < want)
408: fatal("%s: bad parameters: %d %d %d",
1.14 markus 409: __func__, min, want, max);
1.1 provos 410:
411: buffer_clear(m);
412:
413: dh = choose_dh(min, want, max);
414: if (dh == NULL) {
415: buffer_put_char(m, 0);
416: return (0);
417: } else {
418: /* Send first bignum */
419: buffer_put_char(m, 1);
420: buffer_put_bignum2(m, dh->p);
421: buffer_put_bignum2(m, dh->g);
1.3 markus 422:
1.1 provos 423: DH_free(dh);
424: }
425: mm_request_send(socket, MONITOR_ANS_MODULI, m);
426: return (0);
427: }
428:
429: int
430: mm_answer_sign(int socket, Buffer *m)
431: {
432: Key *key;
433: u_char *p;
434: u_char *signature;
435: u_int siglen, datlen;
436: int keyid;
1.3 markus 437:
1.14 markus 438: debug3("%s", __func__);
1.1 provos 439:
1.3 markus 440: keyid = buffer_get_int(m);
441: p = buffer_get_string(m, &datlen);
1.1 provos 442:
443: if (datlen != 20)
1.19 deraadt 444: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 445:
1.13 markus 446: /* save session id, it will be passed on the first call */
447: if (session_id2_len == 0) {
448: session_id2_len = datlen;
449: session_id2 = xmalloc(session_id2_len);
450: memcpy(session_id2, p, session_id2_len);
451: }
452:
1.1 provos 453: if ((key = get_hostkey_by_index(keyid)) == NULL)
1.14 markus 454: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 455: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1.14 markus 456: fatal("%s: key_sign failed", __func__);
1.1 provos 457:
1.19 deraadt 458: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 459:
460: buffer_clear(m);
461: buffer_put_string(m, signature, siglen);
462:
463: xfree(p);
464: xfree(signature);
465:
466: mm_request_send(socket, MONITOR_ANS_SIGN, m);
467:
468: /* Turn on permissions for getpwnam */
469: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
470:
471: return (0);
472: }
473:
474: /* Retrieves the password entry and also checks if the user is permitted */
475:
476: int
477: mm_answer_pwnamallow(int socket, Buffer *m)
478: {
479: char *login;
480: struct passwd *pwent;
481: int allowed = 0;
1.3 markus 482:
1.14 markus 483: debug3("%s", __func__);
1.1 provos 484:
485: if (authctxt->attempt++ != 0)
1.14 markus 486: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 487:
488: login = buffer_get_string(m, NULL);
489:
490: pwent = getpwnamallow(login);
491:
492: authctxt->user = xstrdup(login);
493: setproctitle("%s [priv]", pwent ? login : "unknown");
494: xfree(login);
495:
496: buffer_clear(m);
497:
498: if (pwent == NULL) {
499: buffer_put_char(m, 0);
500: goto out;
501: }
502:
503: allowed = 1;
1.4 markus 504: authctxt->pw = pwent;
1.1 provos 505: authctxt->valid = 1;
506:
507: buffer_put_char(m, 1);
508: buffer_put_string(m, pwent, sizeof(struct passwd));
509: buffer_put_cstring(m, pwent->pw_name);
510: buffer_put_cstring(m, "*");
511: buffer_put_cstring(m, pwent->pw_gecos);
512: buffer_put_cstring(m, pwent->pw_class);
513: buffer_put_cstring(m, pwent->pw_dir);
514: buffer_put_cstring(m, pwent->pw_shell);
515:
516: out:
1.14 markus 517: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.1 provos 518: mm_request_send(socket, MONITOR_ANS_PWNAM, m);
519:
520: /* For SSHv1 allow authentication now */
521: if (!compat20)
522: monitor_permit_authentications(1);
1.10 djm 523: else {
1.1 provos 524: /* Allow service/style information on the auth context */
525: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 526: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
527: }
528:
529:
530: return (0);
531: }
532:
533: int mm_answer_auth2_read_banner(int socket, Buffer *m)
534: {
535: char *banner;
536:
537: buffer_clear(m);
538: banner = auth2_read_banner();
539: buffer_put_cstring(m, banner != NULL ? banner : "");
540: mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.1 provos 541:
1.10 djm 542: if (banner != NULL)
1.21 deraadt 543: xfree(banner);
1.1 provos 544:
545: return (0);
546: }
547:
548: int
549: mm_answer_authserv(int socket, Buffer *m)
550: {
551: monitor_permit_authentications(1);
552:
553: authctxt->service = buffer_get_string(m, NULL);
554: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 555: debug3("%s: service=%s, style=%s",
1.14 markus 556: __func__, authctxt->service, authctxt->style);
1.6 stevesk 557:
1.1 provos 558: if (strlen(authctxt->style) == 0) {
559: xfree(authctxt->style);
560: authctxt->style = NULL;
561: }
562:
563: return (0);
564: }
565:
566: int
567: mm_answer_authpassword(int socket, Buffer *m)
568: {
569: static int call_count;
570: char *passwd;
1.22 stevesk 571: int authenticated;
572: u_int plen;
1.1 provos 573:
574: passwd = buffer_get_string(m, &plen);
575: /* Only authenticate if the context is valid */
1.12 markus 576: authenticated = options.password_authentication &&
577: authctxt->valid && auth_password(authctxt, passwd);
1.1 provos 578: memset(passwd, 0, strlen(passwd));
579: xfree(passwd);
580:
581: buffer_clear(m);
582: buffer_put_int(m, authenticated);
583:
1.14 markus 584: debug3("%s: sending result %d", __func__, authenticated);
1.1 provos 585: mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
586:
587: call_count++;
588: if (plen == 0 && call_count == 1)
589: auth_method = "none";
590: else
591: auth_method = "password";
592:
593: /* Causes monitor loop to terminate if authenticated */
594: return (authenticated);
595: }
596:
597: #ifdef BSD_AUTH
598: int
599: mm_answer_bsdauthquery(int socket, Buffer *m)
600: {
601: char *name, *infotxt;
602: u_int numprompts;
603: u_int *echo_on;
604: char **prompts;
605: int res;
606:
607: res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
608: &prompts, &echo_on);
609:
610: buffer_clear(m);
611: buffer_put_int(m, res);
612: if (res != -1)
613: buffer_put_cstring(m, prompts[0]);
614:
1.14 markus 615: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 616: mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
617:
618: if (res != -1) {
619: xfree(name);
620: xfree(infotxt);
621: xfree(prompts);
622: xfree(echo_on);
623: }
624:
625: return (0);
626: }
627:
628: int
629: mm_answer_bsdauthrespond(int socket, Buffer *m)
630: {
631: char *response;
632: int authok;
633:
634: if (authctxt->as == 0)
1.14 markus 635: fatal("%s: no bsd auth session", __func__);
1.1 provos 636:
637: response = buffer_get_string(m, NULL);
1.12 markus 638: authok = options.challenge_response_authentication &&
639: auth_userresponse(authctxt->as, response, 0);
1.1 provos 640: authctxt->as = NULL;
1.14 markus 641: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.1 provos 642: xfree(response);
643:
644: buffer_clear(m);
645: buffer_put_int(m, authok);
646:
1.14 markus 647: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 648: mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
649:
650: auth_method = "bsdauth";
651:
652: return (authok != 0);
653: }
654: #endif
655:
656: #ifdef SKEY
657: int
658: mm_answer_skeyquery(int socket, Buffer *m)
659: {
660: struct skey skey;
661: char challenge[1024];
662: int res;
663:
664: res = skeychallenge(&skey, authctxt->user, challenge);
665:
666: buffer_clear(m);
667: buffer_put_int(m, res);
668: if (res != -1)
669: buffer_put_cstring(m, challenge);
670:
1.14 markus 671: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 672: mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
673:
674: return (0);
675: }
676:
677: int
678: mm_answer_skeyrespond(int socket, Buffer *m)
679: {
680: char *response;
681: int authok;
682:
683: response = buffer_get_string(m, NULL);
684:
1.12 markus 685: authok = (options.challenge_response_authentication &&
686: authctxt->valid &&
1.1 provos 687: skey_haskey(authctxt->pw->pw_name) == 0 &&
688: skey_passcheck(authctxt->pw->pw_name, response) != -1);
689:
690: xfree(response);
691:
692: buffer_clear(m);
693: buffer_put_int(m, authok);
694:
1.14 markus 695: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 696: mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
697:
698: auth_method = "skey";
699:
700: return (authok != 0);
701: }
702: #endif
703:
1.2 markus 704: static void
1.1 provos 705: mm_append_debug(Buffer *m)
706: {
707: if (auth_debug_init && buffer_len(&auth_debug)) {
1.14 markus 708: debug3("%s: Appending debug messages for child", __func__);
1.1 provos 709: buffer_append(m, buffer_ptr(&auth_debug),
710: buffer_len(&auth_debug));
711: buffer_clear(&auth_debug);
712: }
713: }
714:
715: int
716: mm_answer_keyallowed(int socket, Buffer *m)
717: {
718: Key *key;
719: u_char *cuser, *chost, *blob;
720: u_int bloblen;
721: enum mm_keytype type = 0;
722: int allowed = 0;
723:
1.14 markus 724: debug3("%s entering", __func__);
1.3 markus 725:
1.1 provos 726: type = buffer_get_int(m);
727: cuser = buffer_get_string(m, NULL);
728: chost = buffer_get_string(m, NULL);
729: blob = buffer_get_string(m, &bloblen);
730:
731: key = key_from_blob(blob, bloblen);
732:
733: if ((compat20 && type == MM_RSAHOSTKEY) ||
734: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 735: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 736:
1.14 markus 737: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 738:
739: if (key != NULL && authctxt->pw != NULL) {
740: switch(type) {
741: case MM_USERKEY:
1.12 markus 742: allowed = options.pubkey_authentication &&
743: user_key_allowed(authctxt->pw, key);
1.1 provos 744: break;
745: case MM_HOSTKEY:
1.12 markus 746: allowed = options.hostbased_authentication &&
747: hostbased_key_allowed(authctxt->pw,
1.1 provos 748: cuser, chost, key);
749: break;
750: case MM_RSAHOSTKEY:
751: key->type = KEY_RSA1; /* XXX */
1.12 markus 752: allowed = options.rhosts_rsa_authentication &&
753: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 754: cuser, chost, key);
755: break;
756: default:
1.14 markus 757: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 758: break;
759: }
760: key_free(key);
761: }
762:
763: /* clear temporarily storage (used by verify) */
764: monitor_reset_key_state();
765:
766: if (allowed) {
767: /* Save temporarily for comparison in verify */
768: key_blob = blob;
769: key_bloblen = bloblen;
770: key_blobtype = type;
771: hostbased_cuser = cuser;
772: hostbased_chost = chost;
773: }
774:
775: debug3("%s: key %p is %s",
1.14 markus 776: __func__, key, allowed ? "allowed" : "disallowed");
1.1 provos 777:
778: buffer_clear(m);
779: buffer_put_int(m, allowed);
780:
781: mm_append_debug(m);
782:
783: mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
784:
785: if (type == MM_RSAHOSTKEY)
786: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
787:
788: return (0);
789: }
790:
791: static int
792: monitor_valid_userblob(u_char *data, u_int datalen)
793: {
794: Buffer b;
795: u_char *p;
796: u_int len;
797: int fail = 0;
798:
799: buffer_init(&b);
800: buffer_append(&b, data, datalen);
1.3 markus 801:
1.1 provos 802: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 803: p = buffer_ptr(&b);
804: len = buffer_len(&b);
805: if ((session_id2 == NULL) ||
806: (len < session_id2_len) ||
807: (memcmp(p, session_id2, session_id2_len) != 0))
808: fail++;
1.1 provos 809: buffer_consume(&b, session_id2_len);
810: } else {
1.13 markus 811: p = buffer_get_string(&b, &len);
812: if ((session_id2 == NULL) ||
813: (len != session_id2_len) ||
814: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 815: fail++;
1.13 markus 816: xfree(p);
1.1 provos 817: }
818: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
819: fail++;
820: p = buffer_get_string(&b, NULL);
821: if (strcmp(authctxt->user, p) != 0) {
822: log("wrong user name passed to monitor: expected %s != %.100s",
823: authctxt->user, p);
824: fail++;
825: }
826: xfree(p);
827: buffer_skip_string(&b);
828: if (datafellows & SSH_BUG_PKAUTH) {
829: if (!buffer_get_char(&b))
830: fail++;
831: } else {
832: p = buffer_get_string(&b, NULL);
833: if (strcmp("publickey", p) != 0)
834: fail++;
835: xfree(p);
836: if (!buffer_get_char(&b))
837: fail++;
838: buffer_skip_string(&b);
839: }
840: buffer_skip_string(&b);
841: if (buffer_len(&b) != 0)
842: fail++;
843: buffer_free(&b);
844: return (fail == 0);
845: }
846:
847: static int
848: monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
849: u_char *chost)
850: {
851: Buffer b;
852: u_char *p;
853: u_int len;
854: int fail = 0;
855:
856: buffer_init(&b);
857: buffer_append(&b, data, datalen);
1.3 markus 858:
1.13 markus 859: p = buffer_get_string(&b, &len);
860: if ((session_id2 == NULL) ||
861: (len != session_id2_len) ||
862: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 863: fail++;
1.13 markus 864: xfree(p);
865:
1.1 provos 866: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
867: fail++;
868: p = buffer_get_string(&b, NULL);
869: if (strcmp(authctxt->user, p) != 0) {
870: log("wrong user name passed to monitor: expected %s != %.100s",
871: authctxt->user, p);
872: fail++;
873: }
874: xfree(p);
875: buffer_skip_string(&b); /* service */
876: p = buffer_get_string(&b, NULL);
877: if (strcmp(p, "hostbased") != 0)
878: fail++;
879: xfree(p);
880: buffer_skip_string(&b); /* pkalg */
881: buffer_skip_string(&b); /* pkblob */
882:
883: /* verify client host, strip trailing dot if necessary */
884: p = buffer_get_string(&b, NULL);
885: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
886: p[len - 1] = '\0';
887: if (strcmp(p, chost) != 0)
888: fail++;
889: xfree(p);
890:
891: /* verify client user */
892: p = buffer_get_string(&b, NULL);
893: if (strcmp(p, cuser) != 0)
894: fail++;
895: xfree(p);
896:
897: if (buffer_len(&b) != 0)
898: fail++;
899: buffer_free(&b);
900: return (fail == 0);
901: }
902:
903: int
904: mm_answer_keyverify(int socket, Buffer *m)
905: {
906: Key *key;
907: u_char *signature, *data, *blob;
908: u_int signaturelen, datalen, bloblen;
909: int verified = 0;
910: int valid_data = 0;
911:
912: blob = buffer_get_string(m, &bloblen);
913: signature = buffer_get_string(m, &signaturelen);
914: data = buffer_get_string(m, &datalen);
915:
916: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 917: !monitor_allowed_key(blob, bloblen))
1.14 markus 918: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 919:
920: key = key_from_blob(blob, bloblen);
921: if (key == NULL)
1.14 markus 922: fatal("%s: bad public key blob", __func__);
1.1 provos 923:
924: switch (key_blobtype) {
925: case MM_USERKEY:
926: valid_data = monitor_valid_userblob(data, datalen);
927: break;
928: case MM_HOSTKEY:
929: valid_data = monitor_valid_hostbasedblob(data, datalen,
930: hostbased_cuser, hostbased_chost);
931: break;
932: default:
933: valid_data = 0;
934: break;
935: }
936: if (!valid_data)
1.14 markus 937: fatal("%s: bad signature data blob", __func__);
1.1 provos 938:
939: verified = key_verify(key, signature, signaturelen, data, datalen);
940: debug3("%s: key %p signature %s",
1.14 markus 941: __func__, key, verified ? "verified" : "unverified");
1.1 provos 942:
943: key_free(key);
944: xfree(blob);
945: xfree(signature);
946: xfree(data);
947:
1.17 stevesk 948: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
949:
1.1 provos 950: monitor_reset_key_state();
1.3 markus 951:
1.1 provos 952: buffer_clear(m);
953: buffer_put_int(m, verified);
954: mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
955:
956: return (verified);
957: }
958:
1.2 markus 959: static void
1.1 provos 960: mm_record_login(Session *s, struct passwd *pw)
961: {
962: socklen_t fromlen;
963: struct sockaddr_storage from;
964:
965: /*
966: * Get IP address of client. If the connection is not a socket, let
967: * the address be 0.0.0.0.
968: */
969: memset(&from, 0, sizeof(from));
970: if (packet_connection_is_on_socket()) {
971: fromlen = sizeof(from);
972: if (getpeername(packet_get_connection_in(),
973: (struct sockaddr *) & from, &fromlen) < 0) {
974: debug("getpeername: %.100s", strerror(errno));
975: fatal_cleanup();
976: }
977: }
978: /* Record that there was a login on that tty from the remote host. */
979: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
980: get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
981: (struct sockaddr *)&from);
982: }
983:
984: static void
985: mm_session_close(Session *s)
986: {
1.14 markus 987: debug3("%s: session %d pid %d", __func__, s->self, s->pid);
1.1 provos 988: if (s->ttyfd != -1) {
1.14 markus 989: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 990: fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
991: session_pty_cleanup2(s);
992: }
993: s->used = 0;
994: }
995:
996: int
997: mm_answer_pty(int socket, Buffer *m)
998: {
1.11 mouring 999: extern struct monitor *pmonitor;
1.1 provos 1000: Session *s;
1001: int res, fd0;
1002:
1.14 markus 1003: debug3("%s entering", __func__);
1.1 provos 1004:
1005: buffer_clear(m);
1006: s = session_new();
1007: if (s == NULL)
1008: goto error;
1009: s->authctxt = authctxt;
1010: s->pw = authctxt->pw;
1.11 mouring 1011: s->pid = pmonitor->m_pid;
1.1 provos 1012: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1013: if (res == 0)
1014: goto error;
1015: fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1016: pty_setowner(authctxt->pw, s->tty);
1017:
1018: buffer_put_int(m, 1);
1019: buffer_put_cstring(m, s->tty);
1020: mm_request_send(socket, MONITOR_ANS_PTY, m);
1021:
1022: mm_send_fd(socket, s->ptyfd);
1023: mm_send_fd(socket, s->ttyfd);
1024:
1025: /* We need to trick ttyslot */
1026: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1027: fatal("%s: dup2", __func__);
1.1 provos 1028:
1029: mm_record_login(s, authctxt->pw);
1030:
1031: /* Now we can close the file descriptor again */
1032: close(0);
1033:
1034: /* make sure nothing uses fd 0 */
1035: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1036: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1037: if (fd0 != 0)
1.14 markus 1038: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1039:
1040: /* slave is not needed */
1041: close(s->ttyfd);
1042: s->ttyfd = s->ptyfd;
1043: /* no need to dup() because nobody closes ptyfd */
1044: s->ptymaster = s->ptyfd;
1045:
1.14 markus 1046: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1047:
1048: return (0);
1049:
1050: error:
1051: if (s != NULL)
1052: mm_session_close(s);
1053: buffer_put_int(m, 0);
1054: mm_request_send(socket, MONITOR_ANS_PTY, m);
1055: return (0);
1056: }
1057:
1058: int
1059: mm_answer_pty_cleanup(int socket, Buffer *m)
1060: {
1061: Session *s;
1062: char *tty;
1063:
1.14 markus 1064: debug3("%s entering", __func__);
1.1 provos 1065:
1066: tty = buffer_get_string(m, NULL);
1067: if ((s = session_by_tty(tty)) != NULL)
1068: mm_session_close(s);
1069: buffer_clear(m);
1070: xfree(tty);
1071: return (0);
1072: }
1073:
1074: int
1075: mm_answer_sesskey(int socket, Buffer *m)
1076: {
1077: BIGNUM *p;
1078: int rsafail;
1079:
1080: /* Turn off permissions */
1081: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1082:
1083: if ((p = BN_new()) == NULL)
1.14 markus 1084: fatal("%s: BN_new", __func__);
1.1 provos 1085:
1086: buffer_get_bignum2(m, p);
1087:
1088: rsafail = ssh1_session_key(p);
1089:
1090: buffer_clear(m);
1091: buffer_put_int(m, rsafail);
1092: buffer_put_bignum2(m, p);
1093:
1094: BN_clear_free(p);
1095:
1096: mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1097:
1098: /* Turn on permissions for sessid passing */
1099: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1100:
1101: return (0);
1102: }
1103:
1104: int
1105: mm_answer_sessid(int socket, Buffer *m)
1106: {
1107: int i;
1108:
1.14 markus 1109: debug3("%s entering", __func__);
1.1 provos 1110:
1111: if (buffer_len(m) != 16)
1.14 markus 1112: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1113: for (i = 0; i < 16; i++)
1114: session_id[i] = buffer_get_char(m);
1115:
1116: /* Turn on permissions for getpwnam */
1117: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1118:
1119: return (0);
1120: }
1121:
1122: int
1123: mm_answer_rsa_keyallowed(int socket, Buffer *m)
1124: {
1125: BIGNUM *client_n;
1126: Key *key = NULL;
1.3 markus 1127: u_char *blob = NULL;
1128: u_int blen = 0;
1.1 provos 1129: int allowed = 0;
1130:
1.14 markus 1131: debug3("%s entering", __func__);
1.1 provos 1132:
1.12 markus 1133: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1134: if ((client_n = BN_new()) == NULL)
1.14 markus 1135: fatal("%s: BN_new", __func__);
1.1 provos 1136: buffer_get_bignum2(m, client_n);
1137: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1138: BN_clear_free(client_n);
1139: }
1140: buffer_clear(m);
1141: buffer_put_int(m, allowed);
1142:
1143: /* clear temporarily storage (used by generate challenge) */
1144: monitor_reset_key_state();
1145:
1146: if (allowed && key != NULL) {
1147: key->type = KEY_RSA; /* cheat for key_to_blob */
1148: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1149: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1150: buffer_put_string(m, blob, blen);
1151:
1152: /* Save temporarily for comparison in verify */
1153: key_blob = blob;
1154: key_bloblen = blen;
1155: key_blobtype = MM_RSAUSERKEY;
1156: key_free(key);
1157: }
1158:
1159: mm_append_debug(m);
1160:
1161: mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1162:
1163: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1164: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1165: return (0);
1166: }
1167:
1168: int
1169: mm_answer_rsa_challenge(int socket, Buffer *m)
1170: {
1171: Key *key = NULL;
1.3 markus 1172: u_char *blob;
1173: u_int blen;
1.1 provos 1174:
1.14 markus 1175: debug3("%s entering", __func__);
1.1 provos 1176:
1177: if (!authctxt->valid)
1.14 markus 1178: fatal("%s: authctxt not valid", __func__);
1.1 provos 1179: blob = buffer_get_string(m, &blen);
1180: if (!monitor_allowed_key(blob, blen))
1.14 markus 1181: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1182: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1183: fatal("%s: key type mismatch", __func__);
1.1 provos 1184: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1185: fatal("%s: received bad key", __func__);
1.1 provos 1186:
1187: if (ssh1_challenge)
1188: BN_clear_free(ssh1_challenge);
1189: ssh1_challenge = auth_rsa_generate_challenge(key);
1190:
1191: buffer_clear(m);
1192: buffer_put_bignum2(m, ssh1_challenge);
1193:
1.14 markus 1194: debug3("%s sending reply", __func__);
1.1 provos 1195: mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1196:
1197: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1198: return (0);
1199: }
1200:
1201: int
1202: mm_answer_rsa_response(int socket, Buffer *m)
1203: {
1204: Key *key = NULL;
1.3 markus 1205: u_char *blob, *response;
1206: u_int blen, len;
1207: int success;
1.1 provos 1208:
1.14 markus 1209: debug3("%s entering", __func__);
1.1 provos 1210:
1211: if (!authctxt->valid)
1.14 markus 1212: fatal("%s: authctxt not valid", __func__);
1.1 provos 1213: if (ssh1_challenge == NULL)
1.14 markus 1214: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1215:
1216: blob = buffer_get_string(m, &blen);
1217: if (!monitor_allowed_key(blob, blen))
1.14 markus 1218: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1219: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1220: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1221: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1222: fatal("%s: received bad key", __func__);
1.1 provos 1223: response = buffer_get_string(m, &len);
1224: if (len != 16)
1.14 markus 1225: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1226: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1227:
1228: key_free(key);
1229: xfree(response);
1230:
1231: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1232:
1233: /* reset state */
1234: BN_clear_free(ssh1_challenge);
1235: ssh1_challenge = NULL;
1236: monitor_reset_key_state();
1237:
1238: buffer_clear(m);
1239: buffer_put_int(m, success);
1240: mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1241:
1242: return (success);
1243: }
1244:
1245: int
1246: mm_answer_term(int socket, Buffer *req)
1247: {
1.11 mouring 1248: extern struct monitor *pmonitor;
1.1 provos 1249: int res, status;
1250:
1.14 markus 1251: debug3("%s: tearing down sessions", __func__);
1.1 provos 1252:
1253: /* The child is terminating */
1254: session_destroy_all(&mm_session_close);
1255:
1.11 mouring 1256: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1257: if (errno != EINTR)
1258: exit(1);
1.1 provos 1259:
1260: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1261:
1262: /* Terminate process */
1263: exit (res);
1264: }
1265:
1266: void
1.11 mouring 1267: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1268: {
1269: if (compat20) {
1270: set_newkeys(MODE_IN);
1271: set_newkeys(MODE_OUT);
1272: } else {
1273: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1274: packet_set_encryption_key(child_state.ssh1key,
1275: child_state.ssh1keylen, child_state.ssh1cipher);
1276: xfree(child_state.ssh1key);
1.1 provos 1277: }
1278:
1.15 markus 1279: /* for rc4 and other stateful ciphers */
1.1 provos 1280: packet_set_keycontext(MODE_OUT, child_state.keyout);
1281: xfree(child_state.keyout);
1282: packet_set_keycontext(MODE_IN, child_state.keyin);
1283: xfree(child_state.keyin);
1284:
1285: if (!compat20) {
1286: packet_set_iv(MODE_OUT, child_state.ivout);
1287: xfree(child_state.ivout);
1288: packet_set_iv(MODE_IN, child_state.ivin);
1289: xfree(child_state.ivin);
1290: }
1291:
1292: memcpy(&incoming_stream, &child_state.incoming,
1293: sizeof(incoming_stream));
1294: memcpy(&outgoing_stream, &child_state.outgoing,
1295: sizeof(outgoing_stream));
1.3 markus 1296:
1.1 provos 1297: /* Update with new address */
1.16 djm 1298: if (options.compression)
1299: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1300:
1301: /* Network I/O buffers */
1302: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1303: buffer_clear(&input);
1304: buffer_append(&input, child_state.input, child_state.ilen);
1305: memset(child_state.input, 0, child_state.ilen);
1306: xfree(child_state.input);
1307:
1308: buffer_clear(&output);
1309: buffer_append(&output, child_state.output, child_state.olen);
1310: memset(child_state.output, 0, child_state.olen);
1311: xfree(child_state.output);
1312: }
1313:
1.2 markus 1314: static Kex *
1.1 provos 1315: mm_get_kex(Buffer *m)
1316: {
1317: Kex *kex;
1318: void *blob;
1319: u_int bloblen;
1320:
1321: kex = xmalloc(sizeof(*kex));
1322: memset(kex, 0, sizeof(*kex));
1323: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.13 markus 1324: if ((session_id2 == NULL) ||
1325: (kex->session_id_len != session_id2_len) ||
1326: (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1327: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1328: kex->we_need = buffer_get_int(m);
1329: kex->server = 1;
1330: kex->hostkey_type = buffer_get_int(m);
1331: kex->kex_type = buffer_get_int(m);
1332: blob = buffer_get_string(m, &bloblen);
1333: buffer_init(&kex->my);
1334: buffer_append(&kex->my, blob, bloblen);
1335: xfree(blob);
1336: blob = buffer_get_string(m, &bloblen);
1337: buffer_init(&kex->peer);
1338: buffer_append(&kex->peer, blob, bloblen);
1339: xfree(blob);
1340: kex->done = 1;
1341: kex->flags = buffer_get_int(m);
1342: kex->client_version_string = buffer_get_string(m, NULL);
1343: kex->server_version_string = buffer_get_string(m, NULL);
1344: kex->load_host_key=&get_hostkey_by_type;
1345: kex->host_key_index=&get_hostkey_index;
1346:
1347: return (kex);
1348: }
1349:
1350: /* This function requries careful sanity checking */
1351:
1352: void
1.11 mouring 1353: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1354: {
1355: Buffer m;
1356: u_char *blob, *p;
1357: u_int bloblen, plen;
1358:
1.14 markus 1359: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1360:
1361: buffer_init(&m);
1.11 mouring 1362: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1363: if (!compat20) {
1364: child_state.ssh1protoflags = buffer_get_int(&m);
1365: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1366: child_state.ssh1key = buffer_get_string(&m,
1367: &child_state.ssh1keylen);
1.1 provos 1368: child_state.ivout = buffer_get_string(&m,
1369: &child_state.ivoutlen);
1370: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1371: goto skip;
1372: } else {
1373: /* Get the Kex for rekeying */
1.11 mouring 1374: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1375: }
1376:
1377: blob = buffer_get_string(&m, &bloblen);
1378: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1379: xfree(blob);
1380:
1.14 markus 1381: debug3("%s: Waiting for second key", __func__);
1.1 provos 1382: blob = buffer_get_string(&m, &bloblen);
1383: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1384: xfree(blob);
1.3 markus 1385:
1.1 provos 1386: /* Now get sequence numbers for the packets */
1387: packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1388: packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1389:
1390: skip:
1391: /* Get the key context */
1392: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1393: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1394:
1.14 markus 1395: debug3("%s: Getting compression state", __func__);
1.1 provos 1396: /* Get compression state */
1397: p = buffer_get_string(&m, &plen);
1398: if (plen != sizeof(child_state.outgoing))
1.14 markus 1399: fatal("%s: bad request size", __func__);
1.1 provos 1400: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1401: xfree(p);
1402:
1403: p = buffer_get_string(&m, &plen);
1404: if (plen != sizeof(child_state.incoming))
1.14 markus 1405: fatal("%s: bad request size", __func__);
1.1 provos 1406: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1407: xfree(p);
1408:
1409: /* Network I/O buffers */
1.14 markus 1410: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1411: child_state.input = buffer_get_string(&m, &child_state.ilen);
1412: child_state.output = buffer_get_string(&m, &child_state.olen);
1413:
1414: buffer_free(&m);
1415: }
1416:
1417:
1418: /* Allocation functions for zlib */
1419: void *
1420: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1421: {
1.23 ! millert 1422: size_t len = size * ncount;
1.1 provos 1423: void *address;
1424:
1.23 ! millert 1425: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1426: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1427:
1428: address = mm_malloc(mm, len);
1.1 provos 1429:
1430: return (address);
1431: }
1432:
1433: void
1434: mm_zfree(struct mm_master *mm, void *address)
1435: {
1436: mm_free(mm, address);
1437: }
1438:
1439: void
1440: mm_init_compression(struct mm_master *mm)
1441: {
1442: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1443: outgoing_stream.zfree = (free_func)mm_zfree;
1444: outgoing_stream.opaque = mm;
1445:
1446: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1447: incoming_stream.zfree = (free_func)mm_zfree;
1448: incoming_stream.opaque = mm;
1449: }
1450:
1451: /* XXX */
1452:
1453: #define FD_CLOSEONEXEC(x) do { \
1454: if (fcntl(x, F_SETFD, 1) == -1) \
1455: fatal("fcntl(%d, F_SETFD)", x); \
1456: } while (0)
1457:
1.2 markus 1458: static void
1.1 provos 1459: monitor_socketpair(int *pair)
1.3 markus 1460: {
1.1 provos 1461: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.14 markus 1462: fatal("%s: socketpair", __func__);
1.1 provos 1463: FD_CLOSEONEXEC(pair[0]);
1464: FD_CLOSEONEXEC(pair[1]);
1465: }
1466:
1467: #define MM_MEMSIZE 65536
1468:
1469: struct monitor *
1470: monitor_init(void)
1471: {
1472: struct monitor *mon;
1473: int pair[2];
1474:
1475: mon = xmalloc(sizeof(*mon));
1476:
1477: monitor_socketpair(pair);
1478:
1479: mon->m_recvfd = pair[0];
1480: mon->m_sendfd = pair[1];
1481:
1482: /* Used to share zlib space across processes */
1.16 djm 1483: if (options.compression) {
1484: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1485: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1486:
1.16 djm 1487: /* Compression needs to share state across borders */
1488: mm_init_compression(mon->m_zlib);
1489: }
1.1 provos 1490:
1491: return mon;
1492: }
1493:
1494: void
1495: monitor_reinit(struct monitor *mon)
1496: {
1497: int pair[2];
1498:
1499: monitor_socketpair(pair);
1500:
1501: mon->m_recvfd = pair[0];
1502: mon->m_sendfd = pair[1];
1503: }
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