Annotation of src/usr.bin/ssh/monitor.c, Revision 1.19
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"
1.19 ! deraadt 28: RCSID("$OpenBSD: monitor.c,v 1.18 2002/06/26 13:20:57 deraadt 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)
543: free(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;
571: int authenticated, plen;
572:
573: passwd = buffer_get_string(m, &plen);
574: /* Only authenticate if the context is valid */
1.12 markus 575: authenticated = options.password_authentication &&
576: authctxt->valid && auth_password(authctxt, passwd);
1.1 provos 577: memset(passwd, 0, strlen(passwd));
578: xfree(passwd);
579:
580: buffer_clear(m);
581: buffer_put_int(m, authenticated);
582:
1.14 markus 583: debug3("%s: sending result %d", __func__, authenticated);
1.1 provos 584: mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m);
585:
586: call_count++;
587: if (plen == 0 && call_count == 1)
588: auth_method = "none";
589: else
590: auth_method = "password";
591:
592: /* Causes monitor loop to terminate if authenticated */
593: return (authenticated);
594: }
595:
596: #ifdef BSD_AUTH
597: int
598: mm_answer_bsdauthquery(int socket, Buffer *m)
599: {
600: char *name, *infotxt;
601: u_int numprompts;
602: u_int *echo_on;
603: char **prompts;
604: int res;
605:
606: res = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
607: &prompts, &echo_on);
608:
609: buffer_clear(m);
610: buffer_put_int(m, res);
611: if (res != -1)
612: buffer_put_cstring(m, prompts[0]);
613:
1.14 markus 614: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 615: mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m);
616:
617: if (res != -1) {
618: xfree(name);
619: xfree(infotxt);
620: xfree(prompts);
621: xfree(echo_on);
622: }
623:
624: return (0);
625: }
626:
627: int
628: mm_answer_bsdauthrespond(int socket, Buffer *m)
629: {
630: char *response;
631: int authok;
632:
633: if (authctxt->as == 0)
1.14 markus 634: fatal("%s: no bsd auth session", __func__);
1.1 provos 635:
636: response = buffer_get_string(m, NULL);
1.12 markus 637: authok = options.challenge_response_authentication &&
638: auth_userresponse(authctxt->as, response, 0);
1.1 provos 639: authctxt->as = NULL;
1.14 markus 640: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.1 provos 641: xfree(response);
642:
643: buffer_clear(m);
644: buffer_put_int(m, authok);
645:
1.14 markus 646: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 647: mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m);
648:
649: auth_method = "bsdauth";
650:
651: return (authok != 0);
652: }
653: #endif
654:
655: #ifdef SKEY
656: int
657: mm_answer_skeyquery(int socket, Buffer *m)
658: {
659: struct skey skey;
660: char challenge[1024];
661: int res;
662:
663: res = skeychallenge(&skey, authctxt->user, challenge);
664:
665: buffer_clear(m);
666: buffer_put_int(m, res);
667: if (res != -1)
668: buffer_put_cstring(m, challenge);
669:
1.14 markus 670: debug3("%s: sending challenge res: %d", __func__, res);
1.1 provos 671: mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m);
672:
673: return (0);
674: }
675:
676: int
677: mm_answer_skeyrespond(int socket, Buffer *m)
678: {
679: char *response;
680: int authok;
681:
682: response = buffer_get_string(m, NULL);
683:
1.12 markus 684: authok = (options.challenge_response_authentication &&
685: authctxt->valid &&
1.1 provos 686: skey_haskey(authctxt->pw->pw_name) == 0 &&
687: skey_passcheck(authctxt->pw->pw_name, response) != -1);
688:
689: xfree(response);
690:
691: buffer_clear(m);
692: buffer_put_int(m, authok);
693:
1.14 markus 694: debug3("%s: sending authenticated: %d", __func__, authok);
1.1 provos 695: mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m);
696:
697: auth_method = "skey";
698:
699: return (authok != 0);
700: }
701: #endif
702:
1.2 markus 703: static void
1.1 provos 704: mm_append_debug(Buffer *m)
705: {
706: if (auth_debug_init && buffer_len(&auth_debug)) {
1.14 markus 707: debug3("%s: Appending debug messages for child", __func__);
1.1 provos 708: buffer_append(m, buffer_ptr(&auth_debug),
709: buffer_len(&auth_debug));
710: buffer_clear(&auth_debug);
711: }
712: }
713:
714: int
715: mm_answer_keyallowed(int socket, Buffer *m)
716: {
717: Key *key;
718: u_char *cuser, *chost, *blob;
719: u_int bloblen;
720: enum mm_keytype type = 0;
721: int allowed = 0;
722:
1.14 markus 723: debug3("%s entering", __func__);
1.3 markus 724:
1.1 provos 725: type = buffer_get_int(m);
726: cuser = buffer_get_string(m, NULL);
727: chost = buffer_get_string(m, NULL);
728: blob = buffer_get_string(m, &bloblen);
729:
730: key = key_from_blob(blob, bloblen);
731:
732: if ((compat20 && type == MM_RSAHOSTKEY) ||
733: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 734: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 735:
1.14 markus 736: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 737:
738: if (key != NULL && authctxt->pw != NULL) {
739: switch(type) {
740: case MM_USERKEY:
1.12 markus 741: allowed = options.pubkey_authentication &&
742: user_key_allowed(authctxt->pw, key);
1.1 provos 743: break;
744: case MM_HOSTKEY:
1.12 markus 745: allowed = options.hostbased_authentication &&
746: hostbased_key_allowed(authctxt->pw,
1.1 provos 747: cuser, chost, key);
748: break;
749: case MM_RSAHOSTKEY:
750: key->type = KEY_RSA1; /* XXX */
1.12 markus 751: allowed = options.rhosts_rsa_authentication &&
752: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 753: cuser, chost, key);
754: break;
755: default:
1.14 markus 756: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 757: break;
758: }
759: key_free(key);
760: }
761:
762: /* clear temporarily storage (used by verify) */
763: monitor_reset_key_state();
764:
765: if (allowed) {
766: /* Save temporarily for comparison in verify */
767: key_blob = blob;
768: key_bloblen = bloblen;
769: key_blobtype = type;
770: hostbased_cuser = cuser;
771: hostbased_chost = chost;
772: }
773:
774: debug3("%s: key %p is %s",
1.14 markus 775: __func__, key, allowed ? "allowed" : "disallowed");
1.1 provos 776:
777: buffer_clear(m);
778: buffer_put_int(m, allowed);
779:
780: mm_append_debug(m);
781:
782: mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m);
783:
784: if (type == MM_RSAHOSTKEY)
785: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
786:
787: return (0);
788: }
789:
790: static int
791: monitor_valid_userblob(u_char *data, u_int datalen)
792: {
793: Buffer b;
794: u_char *p;
795: u_int len;
796: int fail = 0;
797:
798: buffer_init(&b);
799: buffer_append(&b, data, datalen);
1.3 markus 800:
1.1 provos 801: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 802: p = buffer_ptr(&b);
803: len = buffer_len(&b);
804: if ((session_id2 == NULL) ||
805: (len < session_id2_len) ||
806: (memcmp(p, session_id2, session_id2_len) != 0))
807: fail++;
1.1 provos 808: buffer_consume(&b, session_id2_len);
809: } else {
1.13 markus 810: p = buffer_get_string(&b, &len);
811: if ((session_id2 == NULL) ||
812: (len != session_id2_len) ||
813: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 814: fail++;
1.13 markus 815: xfree(p);
1.1 provos 816: }
817: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
818: fail++;
819: p = buffer_get_string(&b, NULL);
820: if (strcmp(authctxt->user, p) != 0) {
821: log("wrong user name passed to monitor: expected %s != %.100s",
822: authctxt->user, p);
823: fail++;
824: }
825: xfree(p);
826: buffer_skip_string(&b);
827: if (datafellows & SSH_BUG_PKAUTH) {
828: if (!buffer_get_char(&b))
829: fail++;
830: } else {
831: p = buffer_get_string(&b, NULL);
832: if (strcmp("publickey", p) != 0)
833: fail++;
834: xfree(p);
835: if (!buffer_get_char(&b))
836: fail++;
837: buffer_skip_string(&b);
838: }
839: buffer_skip_string(&b);
840: if (buffer_len(&b) != 0)
841: fail++;
842: buffer_free(&b);
843: return (fail == 0);
844: }
845:
846: static int
847: monitor_valid_hostbasedblob(u_char *data, u_int datalen, u_char *cuser,
848: u_char *chost)
849: {
850: Buffer b;
851: u_char *p;
852: u_int len;
853: int fail = 0;
854:
855: buffer_init(&b);
856: buffer_append(&b, data, datalen);
1.3 markus 857:
1.13 markus 858: p = buffer_get_string(&b, &len);
859: if ((session_id2 == NULL) ||
860: (len != session_id2_len) ||
861: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 862: fail++;
1.13 markus 863: xfree(p);
864:
1.1 provos 865: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
866: fail++;
867: p = buffer_get_string(&b, NULL);
868: if (strcmp(authctxt->user, p) != 0) {
869: log("wrong user name passed to monitor: expected %s != %.100s",
870: authctxt->user, p);
871: fail++;
872: }
873: xfree(p);
874: buffer_skip_string(&b); /* service */
875: p = buffer_get_string(&b, NULL);
876: if (strcmp(p, "hostbased") != 0)
877: fail++;
878: xfree(p);
879: buffer_skip_string(&b); /* pkalg */
880: buffer_skip_string(&b); /* pkblob */
881:
882: /* verify client host, strip trailing dot if necessary */
883: p = buffer_get_string(&b, NULL);
884: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
885: p[len - 1] = '\0';
886: if (strcmp(p, chost) != 0)
887: fail++;
888: xfree(p);
889:
890: /* verify client user */
891: p = buffer_get_string(&b, NULL);
892: if (strcmp(p, cuser) != 0)
893: fail++;
894: xfree(p);
895:
896: if (buffer_len(&b) != 0)
897: fail++;
898: buffer_free(&b);
899: return (fail == 0);
900: }
901:
902: int
903: mm_answer_keyverify(int socket, Buffer *m)
904: {
905: Key *key;
906: u_char *signature, *data, *blob;
907: u_int signaturelen, datalen, bloblen;
908: int verified = 0;
909: int valid_data = 0;
910:
911: blob = buffer_get_string(m, &bloblen);
912: signature = buffer_get_string(m, &signaturelen);
913: data = buffer_get_string(m, &datalen);
914:
915: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 916: !monitor_allowed_key(blob, bloblen))
1.14 markus 917: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 918:
919: key = key_from_blob(blob, bloblen);
920: if (key == NULL)
1.14 markus 921: fatal("%s: bad public key blob", __func__);
1.1 provos 922:
923: switch (key_blobtype) {
924: case MM_USERKEY:
925: valid_data = monitor_valid_userblob(data, datalen);
926: break;
927: case MM_HOSTKEY:
928: valid_data = monitor_valid_hostbasedblob(data, datalen,
929: hostbased_cuser, hostbased_chost);
930: break;
931: default:
932: valid_data = 0;
933: break;
934: }
935: if (!valid_data)
1.14 markus 936: fatal("%s: bad signature data blob", __func__);
1.1 provos 937:
938: verified = key_verify(key, signature, signaturelen, data, datalen);
939: debug3("%s: key %p signature %s",
1.14 markus 940: __func__, key, verified ? "verified" : "unverified");
1.1 provos 941:
942: key_free(key);
943: xfree(blob);
944: xfree(signature);
945: xfree(data);
946:
1.17 stevesk 947: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
948:
1.1 provos 949: monitor_reset_key_state();
1.3 markus 950:
1.1 provos 951: buffer_clear(m);
952: buffer_put_int(m, verified);
953: mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m);
954:
955: return (verified);
956: }
957:
1.2 markus 958: static void
1.1 provos 959: mm_record_login(Session *s, struct passwd *pw)
960: {
961: socklen_t fromlen;
962: struct sockaddr_storage from;
963:
964: /*
965: * Get IP address of client. If the connection is not a socket, let
966: * the address be 0.0.0.0.
967: */
968: memset(&from, 0, sizeof(from));
969: if (packet_connection_is_on_socket()) {
970: fromlen = sizeof(from);
971: if (getpeername(packet_get_connection_in(),
972: (struct sockaddr *) & from, &fromlen) < 0) {
973: debug("getpeername: %.100s", strerror(errno));
974: fatal_cleanup();
975: }
976: }
977: /* Record that there was a login on that tty from the remote host. */
978: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
979: get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
980: (struct sockaddr *)&from);
981: }
982:
983: static void
984: mm_session_close(Session *s)
985: {
1.14 markus 986: debug3("%s: session %d pid %d", __func__, s->self, s->pid);
1.1 provos 987: if (s->ttyfd != -1) {
1.14 markus 988: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 989: fatal_remove_cleanup(session_pty_cleanup2, (void *)s);
990: session_pty_cleanup2(s);
991: }
992: s->used = 0;
993: }
994:
995: int
996: mm_answer_pty(int socket, Buffer *m)
997: {
1.11 mouring 998: extern struct monitor *pmonitor;
1.1 provos 999: Session *s;
1000: int res, fd0;
1001:
1.14 markus 1002: debug3("%s entering", __func__);
1.1 provos 1003:
1004: buffer_clear(m);
1005: s = session_new();
1006: if (s == NULL)
1007: goto error;
1008: s->authctxt = authctxt;
1009: s->pw = authctxt->pw;
1.11 mouring 1010: s->pid = pmonitor->m_pid;
1.1 provos 1011: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1012: if (res == 0)
1013: goto error;
1014: fatal_add_cleanup(session_pty_cleanup2, (void *)s);
1015: pty_setowner(authctxt->pw, s->tty);
1016:
1017: buffer_put_int(m, 1);
1018: buffer_put_cstring(m, s->tty);
1019: mm_request_send(socket, MONITOR_ANS_PTY, m);
1020:
1021: mm_send_fd(socket, s->ptyfd);
1022: mm_send_fd(socket, s->ttyfd);
1023:
1024: /* We need to trick ttyslot */
1025: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1026: fatal("%s: dup2", __func__);
1.1 provos 1027:
1028: mm_record_login(s, authctxt->pw);
1029:
1030: /* Now we can close the file descriptor again */
1031: close(0);
1032:
1033: /* make sure nothing uses fd 0 */
1034: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1035: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1036: if (fd0 != 0)
1.14 markus 1037: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1038:
1039: /* slave is not needed */
1040: close(s->ttyfd);
1041: s->ttyfd = s->ptyfd;
1042: /* no need to dup() because nobody closes ptyfd */
1043: s->ptymaster = s->ptyfd;
1044:
1.14 markus 1045: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1046:
1047: return (0);
1048:
1049: error:
1050: if (s != NULL)
1051: mm_session_close(s);
1052: buffer_put_int(m, 0);
1053: mm_request_send(socket, MONITOR_ANS_PTY, m);
1054: return (0);
1055: }
1056:
1057: int
1058: mm_answer_pty_cleanup(int socket, Buffer *m)
1059: {
1060: Session *s;
1061: char *tty;
1062:
1.14 markus 1063: debug3("%s entering", __func__);
1.1 provos 1064:
1065: tty = buffer_get_string(m, NULL);
1066: if ((s = session_by_tty(tty)) != NULL)
1067: mm_session_close(s);
1068: buffer_clear(m);
1069: xfree(tty);
1070: return (0);
1071: }
1072:
1073: int
1074: mm_answer_sesskey(int socket, Buffer *m)
1075: {
1076: BIGNUM *p;
1077: int rsafail;
1078:
1079: /* Turn off permissions */
1080: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
1081:
1082: if ((p = BN_new()) == NULL)
1.14 markus 1083: fatal("%s: BN_new", __func__);
1.1 provos 1084:
1085: buffer_get_bignum2(m, p);
1086:
1087: rsafail = ssh1_session_key(p);
1088:
1089: buffer_clear(m);
1090: buffer_put_int(m, rsafail);
1091: buffer_put_bignum2(m, p);
1092:
1093: BN_clear_free(p);
1094:
1095: mm_request_send(socket, MONITOR_ANS_SESSKEY, m);
1096:
1097: /* Turn on permissions for sessid passing */
1098: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1099:
1100: return (0);
1101: }
1102:
1103: int
1104: mm_answer_sessid(int socket, Buffer *m)
1105: {
1106: int i;
1107:
1.14 markus 1108: debug3("%s entering", __func__);
1.1 provos 1109:
1110: if (buffer_len(m) != 16)
1.14 markus 1111: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1112: for (i = 0; i < 16; i++)
1113: session_id[i] = buffer_get_char(m);
1114:
1115: /* Turn on permissions for getpwnam */
1116: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1117:
1118: return (0);
1119: }
1120:
1121: int
1122: mm_answer_rsa_keyallowed(int socket, Buffer *m)
1123: {
1124: BIGNUM *client_n;
1125: Key *key = NULL;
1.3 markus 1126: u_char *blob = NULL;
1127: u_int blen = 0;
1.1 provos 1128: int allowed = 0;
1129:
1.14 markus 1130: debug3("%s entering", __func__);
1.1 provos 1131:
1.12 markus 1132: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1133: if ((client_n = BN_new()) == NULL)
1.14 markus 1134: fatal("%s: BN_new", __func__);
1.1 provos 1135: buffer_get_bignum2(m, client_n);
1136: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1137: BN_clear_free(client_n);
1138: }
1139: buffer_clear(m);
1140: buffer_put_int(m, allowed);
1141:
1142: /* clear temporarily storage (used by generate challenge) */
1143: monitor_reset_key_state();
1144:
1145: if (allowed && key != NULL) {
1146: key->type = KEY_RSA; /* cheat for key_to_blob */
1147: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1148: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1149: buffer_put_string(m, blob, blen);
1150:
1151: /* Save temporarily for comparison in verify */
1152: key_blob = blob;
1153: key_bloblen = blen;
1154: key_blobtype = MM_RSAUSERKEY;
1155: key_free(key);
1156: }
1157:
1158: mm_append_debug(m);
1159:
1160: mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m);
1161:
1162: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1163: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1164: return (0);
1165: }
1166:
1167: int
1168: mm_answer_rsa_challenge(int socket, Buffer *m)
1169: {
1170: Key *key = NULL;
1.3 markus 1171: u_char *blob;
1172: u_int blen;
1.1 provos 1173:
1.14 markus 1174: debug3("%s entering", __func__);
1.1 provos 1175:
1176: if (!authctxt->valid)
1.14 markus 1177: fatal("%s: authctxt not valid", __func__);
1.1 provos 1178: blob = buffer_get_string(m, &blen);
1179: if (!monitor_allowed_key(blob, blen))
1.14 markus 1180: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1181: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1182: fatal("%s: key type mismatch", __func__);
1.1 provos 1183: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1184: fatal("%s: received bad key", __func__);
1.1 provos 1185:
1186: if (ssh1_challenge)
1187: BN_clear_free(ssh1_challenge);
1188: ssh1_challenge = auth_rsa_generate_challenge(key);
1189:
1190: buffer_clear(m);
1191: buffer_put_bignum2(m, ssh1_challenge);
1192:
1.14 markus 1193: debug3("%s sending reply", __func__);
1.1 provos 1194: mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m);
1195:
1196: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1197: return (0);
1198: }
1199:
1200: int
1201: mm_answer_rsa_response(int socket, Buffer *m)
1202: {
1203: Key *key = NULL;
1.3 markus 1204: u_char *blob, *response;
1205: u_int blen, len;
1206: int success;
1.1 provos 1207:
1.14 markus 1208: debug3("%s entering", __func__);
1.1 provos 1209:
1210: if (!authctxt->valid)
1.14 markus 1211: fatal("%s: authctxt not valid", __func__);
1.1 provos 1212: if (ssh1_challenge == NULL)
1.14 markus 1213: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1214:
1215: blob = buffer_get_string(m, &blen);
1216: if (!monitor_allowed_key(blob, blen))
1.14 markus 1217: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1218: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1219: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1220: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1221: fatal("%s: received bad key", __func__);
1.1 provos 1222: response = buffer_get_string(m, &len);
1223: if (len != 16)
1.14 markus 1224: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1225: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1226:
1227: key_free(key);
1228: xfree(response);
1229:
1230: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1231:
1232: /* reset state */
1233: BN_clear_free(ssh1_challenge);
1234: ssh1_challenge = NULL;
1235: monitor_reset_key_state();
1236:
1237: buffer_clear(m);
1238: buffer_put_int(m, success);
1239: mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m);
1240:
1241: return (success);
1242: }
1243:
1244: int
1245: mm_answer_term(int socket, Buffer *req)
1246: {
1.11 mouring 1247: extern struct monitor *pmonitor;
1.1 provos 1248: int res, status;
1249:
1.14 markus 1250: debug3("%s: tearing down sessions", __func__);
1.1 provos 1251:
1252: /* The child is terminating */
1253: session_destroy_all(&mm_session_close);
1254:
1.11 mouring 1255: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1256: if (errno != EINTR)
1257: exit(1);
1.1 provos 1258:
1259: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1260:
1261: /* Terminate process */
1262: exit (res);
1263: }
1264:
1265: void
1.11 mouring 1266: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1267: {
1268: if (compat20) {
1269: set_newkeys(MODE_IN);
1270: set_newkeys(MODE_OUT);
1271: } else {
1272: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1273: packet_set_encryption_key(child_state.ssh1key,
1274: child_state.ssh1keylen, child_state.ssh1cipher);
1275: xfree(child_state.ssh1key);
1.1 provos 1276: }
1277:
1.15 markus 1278: /* for rc4 and other stateful ciphers */
1.1 provos 1279: packet_set_keycontext(MODE_OUT, child_state.keyout);
1280: xfree(child_state.keyout);
1281: packet_set_keycontext(MODE_IN, child_state.keyin);
1282: xfree(child_state.keyin);
1283:
1284: if (!compat20) {
1285: packet_set_iv(MODE_OUT, child_state.ivout);
1286: xfree(child_state.ivout);
1287: packet_set_iv(MODE_IN, child_state.ivin);
1288: xfree(child_state.ivin);
1289: }
1290:
1291: memcpy(&incoming_stream, &child_state.incoming,
1292: sizeof(incoming_stream));
1293: memcpy(&outgoing_stream, &child_state.outgoing,
1294: sizeof(outgoing_stream));
1.3 markus 1295:
1.1 provos 1296: /* Update with new address */
1.16 djm 1297: if (options.compression)
1298: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1299:
1300: /* Network I/O buffers */
1301: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1302: buffer_clear(&input);
1303: buffer_append(&input, child_state.input, child_state.ilen);
1304: memset(child_state.input, 0, child_state.ilen);
1305: xfree(child_state.input);
1306:
1307: buffer_clear(&output);
1308: buffer_append(&output, child_state.output, child_state.olen);
1309: memset(child_state.output, 0, child_state.olen);
1310: xfree(child_state.output);
1311: }
1312:
1.2 markus 1313: static Kex *
1.1 provos 1314: mm_get_kex(Buffer *m)
1315: {
1316: Kex *kex;
1317: void *blob;
1318: u_int bloblen;
1319:
1320: kex = xmalloc(sizeof(*kex));
1321: memset(kex, 0, sizeof(*kex));
1322: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.13 markus 1323: if ((session_id2 == NULL) ||
1324: (kex->session_id_len != session_id2_len) ||
1325: (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1326: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1327: kex->we_need = buffer_get_int(m);
1328: kex->server = 1;
1329: kex->hostkey_type = buffer_get_int(m);
1330: kex->kex_type = buffer_get_int(m);
1331: blob = buffer_get_string(m, &bloblen);
1332: buffer_init(&kex->my);
1333: buffer_append(&kex->my, blob, bloblen);
1334: xfree(blob);
1335: blob = buffer_get_string(m, &bloblen);
1336: buffer_init(&kex->peer);
1337: buffer_append(&kex->peer, blob, bloblen);
1338: xfree(blob);
1339: kex->done = 1;
1340: kex->flags = buffer_get_int(m);
1341: kex->client_version_string = buffer_get_string(m, NULL);
1342: kex->server_version_string = buffer_get_string(m, NULL);
1343: kex->load_host_key=&get_hostkey_by_type;
1344: kex->host_key_index=&get_hostkey_index;
1345:
1346: return (kex);
1347: }
1348:
1349: /* This function requries careful sanity checking */
1350:
1351: void
1.11 mouring 1352: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1353: {
1354: Buffer m;
1355: u_char *blob, *p;
1356: u_int bloblen, plen;
1357:
1.14 markus 1358: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1359:
1360: buffer_init(&m);
1.11 mouring 1361: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1362: if (!compat20) {
1363: child_state.ssh1protoflags = buffer_get_int(&m);
1364: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1365: child_state.ssh1key = buffer_get_string(&m,
1366: &child_state.ssh1keylen);
1.1 provos 1367: child_state.ivout = buffer_get_string(&m,
1368: &child_state.ivoutlen);
1369: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1370: goto skip;
1371: } else {
1372: /* Get the Kex for rekeying */
1.11 mouring 1373: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1374: }
1375:
1376: blob = buffer_get_string(&m, &bloblen);
1377: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1378: xfree(blob);
1379:
1.14 markus 1380: debug3("%s: Waiting for second key", __func__);
1.1 provos 1381: blob = buffer_get_string(&m, &bloblen);
1382: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1383: xfree(blob);
1.3 markus 1384:
1.1 provos 1385: /* Now get sequence numbers for the packets */
1386: packet_set_seqnr(MODE_OUT, buffer_get_int(&m));
1387: packet_set_seqnr(MODE_IN, buffer_get_int(&m));
1388:
1389: skip:
1390: /* Get the key context */
1391: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1392: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1393:
1.14 markus 1394: debug3("%s: Getting compression state", __func__);
1.1 provos 1395: /* Get compression state */
1396: p = buffer_get_string(&m, &plen);
1397: if (plen != sizeof(child_state.outgoing))
1.14 markus 1398: fatal("%s: bad request size", __func__);
1.1 provos 1399: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1400: xfree(p);
1401:
1402: p = buffer_get_string(&m, &plen);
1403: if (plen != sizeof(child_state.incoming))
1.14 markus 1404: fatal("%s: bad request size", __func__);
1.1 provos 1405: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1406: xfree(p);
1407:
1408: /* Network I/O buffers */
1.14 markus 1409: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1410: child_state.input = buffer_get_string(&m, &child_state.ilen);
1411: child_state.output = buffer_get_string(&m, &child_state.olen);
1412:
1413: buffer_free(&m);
1414: }
1415:
1416:
1417: /* Allocation functions for zlib */
1418: void *
1419: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1420: {
1.18 deraadt 1421: int len = size * ncount;
1.1 provos 1422: void *address;
1423:
1.18 deraadt 1424: if (len <= 0)
1425: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1426:
1427: address = mm_malloc(mm, len);
1.1 provos 1428:
1429: return (address);
1430: }
1431:
1432: void
1433: mm_zfree(struct mm_master *mm, void *address)
1434: {
1435: mm_free(mm, address);
1436: }
1437:
1438: void
1439: mm_init_compression(struct mm_master *mm)
1440: {
1441: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1442: outgoing_stream.zfree = (free_func)mm_zfree;
1443: outgoing_stream.opaque = mm;
1444:
1445: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1446: incoming_stream.zfree = (free_func)mm_zfree;
1447: incoming_stream.opaque = mm;
1448: }
1449:
1450: /* XXX */
1451:
1452: #define FD_CLOSEONEXEC(x) do { \
1453: if (fcntl(x, F_SETFD, 1) == -1) \
1454: fatal("fcntl(%d, F_SETFD)", x); \
1455: } while (0)
1456:
1.2 markus 1457: static void
1.1 provos 1458: monitor_socketpair(int *pair)
1.3 markus 1459: {
1.1 provos 1460: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.14 markus 1461: fatal("%s: socketpair", __func__);
1.1 provos 1462: FD_CLOSEONEXEC(pair[0]);
1463: FD_CLOSEONEXEC(pair[1]);
1464: }
1465:
1466: #define MM_MEMSIZE 65536
1467:
1468: struct monitor *
1469: monitor_init(void)
1470: {
1471: struct monitor *mon;
1472: int pair[2];
1473:
1474: mon = xmalloc(sizeof(*mon));
1475:
1476: monitor_socketpair(pair);
1477:
1478: mon->m_recvfd = pair[0];
1479: mon->m_sendfd = pair[1];
1480:
1481: /* Used to share zlib space across processes */
1.16 djm 1482: if (options.compression) {
1483: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1484: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1485:
1.16 djm 1486: /* Compression needs to share state across borders */
1487: mm_init_compression(mon->m_zlib);
1488: }
1.1 provos 1489:
1490: return mon;
1491: }
1492:
1493: void
1494: monitor_reinit(struct monitor *mon)
1495: {
1496: int pair[2];
1497:
1498: monitor_socketpair(pair);
1499:
1500: mon->m_recvfd = pair[0];
1501: mon->m_sendfd = pair[1];
1502: }
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