Annotation of src/usr.bin/ssh/monitor.c, Revision 1.104
1.104 ! andreas 1: /* $OpenBSD: monitor.c,v 1.103 2009/05/28 16:50:16 andreas Exp $ */
1.1 provos 2: /*
3: * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4: * Copyright 2002 Markus Friedl <markus@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
1.67 stevesk 28: #include <sys/types.h>
29: #include <sys/wait.h>
1.79 stevesk 30: #include <sys/socket.h>
1.85 deraadt 31: #include <sys/tree.h>
1.83 stevesk 32: #include <sys/param.h>
1.95 djm 33: #include <sys/queue.h>
1.1 provos 34:
1.78 stevesk 35: #include <openssl/dh.h>
36:
1.81 stevesk 37: #include <errno.h>
1.80 stevesk 38: #include <fcntl.h>
1.65 stevesk 39: #include <paths.h>
1.78 stevesk 40: #include <pwd.h>
1.68 stevesk 41: #include <signal.h>
1.84 stevesk 42: #include <stdlib.h>
1.82 stevesk 43: #include <string.h>
1.1 provos 44:
45:
1.85 deraadt 46: #include "xmalloc.h"
1.1 provos 47: #include "ssh.h"
1.85 deraadt 48: #include "key.h"
49: #include "buffer.h"
50: #include "hostfile.h"
1.1 provos 51: #include "auth.h"
1.85 deraadt 52: #include "cipher.h"
1.1 provos 53: #include "kex.h"
54: #include "dh.h"
1.88 miod 55: #include <zlib.h>
1.1 provos 56: #include "packet.h"
57: #include "auth-options.h"
58: #include "sshpty.h"
59: #include "channels.h"
60: #include "session.h"
61: #include "sshlogin.h"
62: #include "canohost.h"
63: #include "log.h"
64: #include "servconf.h"
65: #include "monitor.h"
66: #include "monitor_mm.h"
1.85 deraadt 67: #ifdef GSSAPI
68: #include "ssh-gss.h"
69: #endif
1.1 provos 70: #include "monitor_wrap.h"
71: #include "monitor_fdpass.h"
72: #include "misc.h"
73: #include "compat.h"
74: #include "ssh2.h"
1.100 djm 75: #include "jpake.h"
1.104 ! andreas 76: #include "roaming.h"
1.1 provos 77:
1.46 markus 78: #ifdef GSSAPI
79: static Gssctxt *gsscontext = NULL;
80: #endif
81:
1.1 provos 82: /* Imports */
83: extern ServerOptions options;
84: extern u_int utmp_len;
85: extern Newkeys *current_keys[];
86: extern z_stream incoming_stream;
87: extern z_stream outgoing_stream;
88: extern u_char session_id[];
89: extern Buffer auth_debug;
90: extern int auth_debug_init;
1.61 dtucker 91: extern Buffer loginmsg;
1.1 provos 92:
93: /* State exported from the child */
94:
95: struct {
96: z_stream incoming;
97: z_stream outgoing;
98: u_char *keyin;
99: u_int keyinlen;
100: u_char *keyout;
101: u_int keyoutlen;
102: u_char *ivin;
103: u_int ivinlen;
104: u_char *ivout;
105: u_int ivoutlen;
1.15 markus 106: u_char *ssh1key;
107: u_int ssh1keylen;
1.1 provos 108: int ssh1cipher;
109: int ssh1protoflags;
110: u_char *input;
111: u_int ilen;
112: u_char *output;
113: u_int olen;
1.103 andreas 114: u_int64_t sent_bytes;
115: u_int64_t recv_bytes;
1.1 provos 116: } child_state;
117:
1.43 markus 118: /* Functions on the monitor that answer unprivileged requests */
1.1 provos 119:
120: int mm_answer_moduli(int, Buffer *);
121: int mm_answer_sign(int, Buffer *);
122: int mm_answer_pwnamallow(int, Buffer *);
1.10 djm 123: int mm_answer_auth2_read_banner(int, Buffer *);
1.1 provos 124: int mm_answer_authserv(int, Buffer *);
125: int mm_answer_authpassword(int, Buffer *);
126: int mm_answer_bsdauthquery(int, Buffer *);
127: int mm_answer_bsdauthrespond(int, Buffer *);
128: int mm_answer_skeyquery(int, Buffer *);
129: int mm_answer_skeyrespond(int, Buffer *);
130: int mm_answer_keyallowed(int, Buffer *);
131: int mm_answer_keyverify(int, Buffer *);
132: int mm_answer_pty(int, Buffer *);
133: int mm_answer_pty_cleanup(int, Buffer *);
134: int mm_answer_term(int, Buffer *);
135: int mm_answer_rsa_keyallowed(int, Buffer *);
136: int mm_answer_rsa_challenge(int, Buffer *);
137: int mm_answer_rsa_response(int, Buffer *);
138: int mm_answer_sesskey(int, Buffer *);
139: int mm_answer_sessid(int, Buffer *);
1.100 djm 140: int mm_answer_jpake_get_pwdata(int, Buffer *);
141: int mm_answer_jpake_step1(int, Buffer *);
142: int mm_answer_jpake_step2(int, Buffer *);
143: int mm_answer_jpake_key_confirm(int, Buffer *);
144: int mm_answer_jpake_check_confirm(int, Buffer *);
1.1 provos 145:
1.46 markus 146: #ifdef GSSAPI
147: int mm_answer_gss_setup_ctx(int, Buffer *);
148: int mm_answer_gss_accept_ctx(int, Buffer *);
149: int mm_answer_gss_userok(int, Buffer *);
1.52 markus 150: int mm_answer_gss_checkmic(int, Buffer *);
1.46 markus 151: #endif
1.25 itojun 152:
1.1 provos 153: static Authctxt *authctxt;
154: static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
155:
156: /* local state for key verify */
157: static u_char *key_blob = NULL;
158: static u_int key_bloblen = 0;
159: static int key_blobtype = MM_NOKEY;
1.26 markus 160: static char *hostbased_cuser = NULL;
161: static char *hostbased_chost = NULL;
1.1 provos 162: static char *auth_method = "unknown";
1.44 markus 163: static u_int session_id2_len = 0;
1.13 markus 164: static u_char *session_id2 = NULL;
1.40 markus 165: static pid_t monitor_child_pid;
1.1 provos 166:
167: struct mon_table {
168: enum monitor_reqtype type;
169: int flags;
170: int (*f)(int, Buffer *);
171: };
172:
173: #define MON_ISAUTH 0x0004 /* Required for Authentication */
174: #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
175: #define MON_ONCE 0x0010 /* Disable after calling */
1.77 dtucker 176: #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
1.1 provos 177:
178: #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
179:
180: #define MON_PERMIT 0x1000 /* Request is permitted */
181:
182: struct mon_table mon_dispatch_proto20[] = {
183: {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
184: {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
185: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
186: {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
1.10 djm 187: {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
1.1 provos 188: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
189: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 190: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 191: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
192: {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
1.46 markus 193: #ifdef GSSAPI
194: {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
195: {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
196: {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
1.52 markus 197: {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
1.46 markus 198: #endif
1.100 djm 199: #ifdef JPAKE
200: {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
201: {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
202: {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
203: {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
204: {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
205: #endif
1.1 provos 206: {0, 0, NULL}
207: };
208:
209: struct mon_table mon_dispatch_postauth20[] = {
210: {MONITOR_REQ_MODULI, 0, mm_answer_moduli},
211: {MONITOR_REQ_SIGN, 0, mm_answer_sign},
212: {MONITOR_REQ_PTY, 0, mm_answer_pty},
213: {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
214: {MONITOR_REQ_TERM, 0, mm_answer_term},
215: {0, 0, NULL}
216: };
217:
218: struct mon_table mon_dispatch_proto15[] = {
219: {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
220: {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
221: {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
222: {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
1.77 dtucker 223: {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
224: {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
1.1 provos 225: {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
226: {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
227: {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
1.66 stevesk 228: {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
1.1 provos 229: {0, 0, NULL}
230: };
231:
232: struct mon_table mon_dispatch_postauth15[] = {
233: {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
234: {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
235: {MONITOR_REQ_TERM, 0, mm_answer_term},
236: {0, 0, NULL}
237: };
238:
239: struct mon_table *mon_dispatch;
240:
241: /* Specifies if a certain message is allowed at the moment */
242:
243: static void
244: monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
245: {
246: while (ent->f != NULL) {
247: if (ent->type == type) {
248: ent->flags &= ~MON_PERMIT;
249: ent->flags |= permit ? MON_PERMIT : 0;
250: return;
251: }
252: ent++;
253: }
254: }
255:
256: static void
257: monitor_permit_authentications(int permit)
258: {
259: struct mon_table *ent = mon_dispatch;
260:
261: while (ent->f != NULL) {
262: if (ent->flags & MON_AUTH) {
263: ent->flags &= ~MON_PERMIT;
264: ent->flags |= permit ? MON_PERMIT : 0;
265: }
266: ent++;
267: }
268: }
269:
1.50 markus 270: void
271: monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
1.1 provos 272: {
273: struct mon_table *ent;
274: int authenticated = 0;
275:
276: debug3("preauth child monitor started");
277:
1.50 markus 278: authctxt = _authctxt;
279: memset(authctxt, 0, sizeof(*authctxt));
280:
1.1 provos 281: if (compat20) {
282: mon_dispatch = mon_dispatch_proto20;
283:
284: /* Permit requests for moduli and signatures */
285: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
286: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
287: } else {
288: mon_dispatch = mon_dispatch_proto15;
289:
290: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
291: }
292:
293: /* The first few requests do not require asynchronous access */
294: while (!authenticated) {
1.77 dtucker 295: auth_method = "unknown";
1.89 markus 296: authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
1.1 provos 297: if (authenticated) {
298: if (!(ent->flags & MON_AUTHDECIDE))
299: fatal("%s: unexpected authentication from %d",
1.14 markus 300: __func__, ent->type);
1.1 provos 301: if (authctxt->pw->pw_uid == 0 &&
302: !auth_root_allowed(auth_method))
303: authenticated = 0;
304: }
305:
1.77 dtucker 306: if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
1.1 provos 307: auth_log(authctxt, authenticated, auth_method,
308: compat20 ? " ssh2" : "");
309: if (!authenticated)
310: authctxt->failures++;
311: }
1.100 djm 312: #ifdef JPAKE
313: /* Cleanup JPAKE context after authentication */
314: if (ent->flags & MON_AUTHDECIDE) {
315: if (authctxt->jpake_ctx != NULL) {
316: jpake_free(authctxt->jpake_ctx);
317: authctxt->jpake_ctx = NULL;
318: }
319: }
320: #endif
1.1 provos 321: }
322:
323: if (!authctxt->valid)
1.14 markus 324: fatal("%s: authenticated invalid user", __func__);
1.77 dtucker 325: if (strcmp(auth_method, "unknown") == 0)
326: fatal("%s: authentication method name unknown", __func__);
1.1 provos 327:
328: debug("%s: %s has been authenticated by privileged process",
1.14 markus 329: __func__, authctxt->user);
1.1 provos 330:
1.11 mouring 331: mm_get_keystate(pmonitor);
1.1 provos 332: }
333:
1.40 markus 334: static void
335: monitor_set_child_handler(pid_t pid)
336: {
337: monitor_child_pid = pid;
338: }
339:
340: static void
1.59 avsm 341: monitor_child_handler(int sig)
1.40 markus 342: {
1.59 avsm 343: kill(monitor_child_pid, sig);
1.40 markus 344: }
345:
1.1 provos 346: void
1.11 mouring 347: monitor_child_postauth(struct monitor *pmonitor)
1.1 provos 348: {
1.40 markus 349: monitor_set_child_handler(pmonitor->m_pid);
350: signal(SIGHUP, &monitor_child_handler);
351: signal(SIGTERM, &monitor_child_handler);
1.91 djm 352: signal(SIGINT, &monitor_child_handler);
1.40 markus 353:
1.1 provos 354: if (compat20) {
355: mon_dispatch = mon_dispatch_postauth20;
356:
357: /* Permit requests for moduli and signatures */
358: monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
359: monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
360: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
361: } else {
362: mon_dispatch = mon_dispatch_postauth15;
363: monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
364: }
365: if (!no_pty_flag) {
366: monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
367: monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
368: }
369:
370: for (;;)
1.11 mouring 371: monitor_read(pmonitor, mon_dispatch, NULL);
1.1 provos 372: }
373:
374: void
1.11 mouring 375: monitor_sync(struct monitor *pmonitor)
1.1 provos 376: {
1.16 djm 377: if (options.compression) {
378: /* The member allocation is not visible, so sync it */
379: mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
380: }
1.1 provos 381: }
382:
383: int
1.11 mouring 384: monitor_read(struct monitor *pmonitor, struct mon_table *ent,
1.1 provos 385: struct mon_table **pent)
386: {
387: Buffer m;
388: int ret;
389: u_char type;
390:
391: buffer_init(&m);
392:
1.11 mouring 393: mm_request_receive(pmonitor->m_sendfd, &m);
1.1 provos 394: type = buffer_get_char(&m);
395:
1.14 markus 396: debug3("%s: checking request %d", __func__, type);
1.1 provos 397:
398: while (ent->f != NULL) {
399: if (ent->type == type)
400: break;
401: ent++;
402: }
403:
404: if (ent->f != NULL) {
405: if (!(ent->flags & MON_PERMIT))
1.14 markus 406: fatal("%s: unpermitted request %d", __func__,
1.1 provos 407: type);
1.11 mouring 408: ret = (*ent->f)(pmonitor->m_sendfd, &m);
1.1 provos 409: buffer_free(&m);
410:
411: /* The child may use this request only once, disable it */
412: if (ent->flags & MON_ONCE) {
1.14 markus 413: debug2("%s: %d used once, disabling now", __func__,
1.1 provos 414: type);
415: ent->flags &= ~MON_PERMIT;
416: }
417:
418: if (pent != NULL)
419: *pent = ent;
1.3 markus 420:
1.1 provos 421: return ret;
422: }
423:
1.14 markus 424: fatal("%s: unsupported request: %d", __func__, type);
1.1 provos 425:
426: /* NOTREACHED */
427: return (-1);
428: }
429:
430: /* allowed key state */
431: static int
432: monitor_allowed_key(u_char *blob, u_int bloblen)
433: {
434: /* make sure key is allowed */
435: if (key_blob == NULL || key_bloblen != bloblen ||
436: memcmp(key_blob, blob, key_bloblen))
437: return (0);
438: return (1);
439: }
440:
441: static void
442: monitor_reset_key_state(void)
443: {
444: /* reset state */
445: if (key_blob != NULL)
446: xfree(key_blob);
447: if (hostbased_cuser != NULL)
448: xfree(hostbased_cuser);
449: if (hostbased_chost != NULL)
450: xfree(hostbased_chost);
451: key_blob = NULL;
452: key_bloblen = 0;
453: key_blobtype = MM_NOKEY;
454: hostbased_cuser = NULL;
455: hostbased_chost = NULL;
456: }
457:
458: int
1.59 avsm 459: mm_answer_moduli(int sock, Buffer *m)
1.1 provos 460: {
461: DH *dh;
462: int min, want, max;
463:
464: min = buffer_get_int(m);
465: want = buffer_get_int(m);
466: max = buffer_get_int(m);
467:
468: debug3("%s: got parameters: %d %d %d",
1.14 markus 469: __func__, min, want, max);
1.1 provos 470: /* We need to check here, too, in case the child got corrupted */
471: if (max < min || want < min || max < want)
472: fatal("%s: bad parameters: %d %d %d",
1.14 markus 473: __func__, min, want, max);
1.1 provos 474:
475: buffer_clear(m);
476:
477: dh = choose_dh(min, want, max);
478: if (dh == NULL) {
479: buffer_put_char(m, 0);
480: return (0);
481: } else {
482: /* Send first bignum */
483: buffer_put_char(m, 1);
484: buffer_put_bignum2(m, dh->p);
485: buffer_put_bignum2(m, dh->g);
1.3 markus 486:
1.1 provos 487: DH_free(dh);
488: }
1.59 avsm 489: mm_request_send(sock, MONITOR_ANS_MODULI, m);
1.1 provos 490: return (0);
491: }
492:
493: int
1.59 avsm 494: mm_answer_sign(int sock, Buffer *m)
1.1 provos 495: {
496: Key *key;
497: u_char *p;
498: u_char *signature;
499: u_int siglen, datlen;
500: int keyid;
1.3 markus 501:
1.14 markus 502: debug3("%s", __func__);
1.1 provos 503:
1.3 markus 504: keyid = buffer_get_int(m);
505: p = buffer_get_string(m, &datlen);
1.1 provos 506:
1.69 djm 507: /*
1.71 deraadt 508: * Supported KEX types will only return SHA1 (20 byte) or
1.69 djm 509: * SHA256 (32 byte) hashes
510: */
511: if (datlen != 20 && datlen != 32)
1.19 deraadt 512: fatal("%s: data length incorrect: %u", __func__, datlen);
1.1 provos 513:
1.13 markus 514: /* save session id, it will be passed on the first call */
515: if (session_id2_len == 0) {
516: session_id2_len = datlen;
517: session_id2 = xmalloc(session_id2_len);
518: memcpy(session_id2, p, session_id2_len);
519: }
520:
1.1 provos 521: if ((key = get_hostkey_by_index(keyid)) == NULL)
1.14 markus 522: fatal("%s: no hostkey from index %d", __func__, keyid);
1.1 provos 523: if (key_sign(key, &signature, &siglen, p, datlen) < 0)
1.14 markus 524: fatal("%s: key_sign failed", __func__);
1.1 provos 525:
1.19 deraadt 526: debug3("%s: signature %p(%u)", __func__, signature, siglen);
1.1 provos 527:
528: buffer_clear(m);
529: buffer_put_string(m, signature, siglen);
530:
531: xfree(p);
532: xfree(signature);
533:
1.59 avsm 534: mm_request_send(sock, MONITOR_ANS_SIGN, m);
1.1 provos 535:
536: /* Turn on permissions for getpwnam */
537: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
538:
539: return (0);
540: }
541:
542: /* Retrieves the password entry and also checks if the user is permitted */
543:
544: int
1.59 avsm 545: mm_answer_pwnamallow(int sock, Buffer *m)
1.1 provos 546: {
1.60 dtucker 547: char *username;
1.1 provos 548: struct passwd *pwent;
549: int allowed = 0;
1.3 markus 550:
1.14 markus 551: debug3("%s", __func__);
1.1 provos 552:
553: if (authctxt->attempt++ != 0)
1.14 markus 554: fatal("%s: multiple attempts for getpwnam", __func__);
1.1 provos 555:
1.60 dtucker 556: username = buffer_get_string(m, NULL);
1.1 provos 557:
1.60 dtucker 558: pwent = getpwnamallow(username);
1.1 provos 559:
1.60 dtucker 560: authctxt->user = xstrdup(username);
561: setproctitle("%s [priv]", pwent ? username : "unknown");
562: xfree(username);
1.1 provos 563:
564: buffer_clear(m);
565:
566: if (pwent == NULL) {
567: buffer_put_char(m, 0);
1.53 djm 568: authctxt->pw = fakepw();
1.1 provos 569: goto out;
570: }
571:
572: allowed = 1;
1.4 markus 573: authctxt->pw = pwent;
1.1 provos 574: authctxt->valid = 1;
575:
576: buffer_put_char(m, 1);
577: buffer_put_string(m, pwent, sizeof(struct passwd));
578: buffer_put_cstring(m, pwent->pw_name);
579: buffer_put_cstring(m, "*");
580: buffer_put_cstring(m, pwent->pw_gecos);
581: buffer_put_cstring(m, pwent->pw_class);
582: buffer_put_cstring(m, pwent->pw_dir);
583: buffer_put_cstring(m, pwent->pw_shell);
1.94 dtucker 584:
585: out:
1.90 dtucker 586: buffer_put_string(m, &options, sizeof(options));
587: if (options.banner != NULL)
588: buffer_put_cstring(m, options.banner);
1.14 markus 589: debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
1.59 avsm 590: mm_request_send(sock, MONITOR_ANS_PWNAM, m);
1.1 provos 591:
592: /* For SSHv1 allow authentication now */
593: if (!compat20)
594: monitor_permit_authentications(1);
1.10 djm 595: else {
1.1 provos 596: /* Allow service/style information on the auth context */
597: monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
1.10 djm 598: monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
599: }
600:
601:
602: return (0);
603: }
604:
1.59 avsm 605: int mm_answer_auth2_read_banner(int sock, Buffer *m)
1.10 djm 606: {
607: char *banner;
608:
609: buffer_clear(m);
610: banner = auth2_read_banner();
611: buffer_put_cstring(m, banner != NULL ? banner : "");
1.59 avsm 612: mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
1.1 provos 613:
1.10 djm 614: if (banner != NULL)
1.21 deraadt 615: xfree(banner);
1.1 provos 616:
617: return (0);
618: }
619:
620: int
1.59 avsm 621: mm_answer_authserv(int sock, Buffer *m)
1.1 provos 622: {
623: monitor_permit_authentications(1);
624:
625: authctxt->service = buffer_get_string(m, NULL);
626: authctxt->style = buffer_get_string(m, NULL);
1.6 stevesk 627: debug3("%s: service=%s, style=%s",
1.14 markus 628: __func__, authctxt->service, authctxt->style);
1.6 stevesk 629:
1.1 provos 630: if (strlen(authctxt->style) == 0) {
631: xfree(authctxt->style);
632: authctxt->style = NULL;
633: }
634:
635: return (0);
636: }
637:
638: int
1.59 avsm 639: mm_answer_authpassword(int sock, Buffer *m)
1.1 provos 640: {
641: static int call_count;
642: char *passwd;
1.22 stevesk 643: int authenticated;
644: u_int plen;
1.1 provos 645:
646: passwd = buffer_get_string(m, &plen);
647: /* Only authenticate if the context is valid */
1.12 markus 648: authenticated = options.password_authentication &&
1.48 markus 649: auth_password(authctxt, passwd);
1.1 provos 650: memset(passwd, 0, strlen(passwd));
651: xfree(passwd);
652:
653: buffer_clear(m);
654: buffer_put_int(m, authenticated);
655:
1.14 markus 656: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 657: mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
1.1 provos 658:
659: call_count++;
660: if (plen == 0 && call_count == 1)
661: auth_method = "none";
662: else
663: auth_method = "password";
664:
665: /* Causes monitor loop to terminate if authenticated */
666: return (authenticated);
667: }
668:
669: int
1.59 avsm 670: mm_answer_bsdauthquery(int sock, Buffer *m)
1.1 provos 671: {
672: char *name, *infotxt;
673: u_int numprompts;
674: u_int *echo_on;
675: char **prompts;
1.31 markus 676: u_int success;
1.1 provos 677:
1.31 markus 678: success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
679: &prompts, &echo_on) < 0 ? 0 : 1;
1.1 provos 680:
681: buffer_clear(m);
1.31 markus 682: buffer_put_int(m, success);
683: if (success)
1.1 provos 684: buffer_put_cstring(m, prompts[0]);
685:
1.31 markus 686: debug3("%s: sending challenge success: %u", __func__, success);
1.59 avsm 687: mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
1.1 provos 688:
1.31 markus 689: if (success) {
1.1 provos 690: xfree(name);
691: xfree(infotxt);
692: xfree(prompts);
693: xfree(echo_on);
694: }
695:
696: return (0);
697: }
698:
699: int
1.59 avsm 700: mm_answer_bsdauthrespond(int sock, Buffer *m)
1.1 provos 701: {
702: char *response;
703: int authok;
704:
705: if (authctxt->as == 0)
1.14 markus 706: fatal("%s: no bsd auth session", __func__);
1.1 provos 707:
708: response = buffer_get_string(m, NULL);
1.12 markus 709: authok = options.challenge_response_authentication &&
710: auth_userresponse(authctxt->as, response, 0);
1.1 provos 711: authctxt->as = NULL;
1.14 markus 712: debug3("%s: <%s> = <%d>", __func__, response, authok);
1.1 provos 713: xfree(response);
714:
715: buffer_clear(m);
716: buffer_put_int(m, authok);
717:
1.14 markus 718: debug3("%s: sending authenticated: %d", __func__, authok);
1.59 avsm 719: mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
1.1 provos 720:
721: auth_method = "bsdauth";
722:
723: return (authok != 0);
724: }
725:
726:
1.2 markus 727: static void
1.1 provos 728: mm_append_debug(Buffer *m)
729: {
730: if (auth_debug_init && buffer_len(&auth_debug)) {
1.14 markus 731: debug3("%s: Appending debug messages for child", __func__);
1.1 provos 732: buffer_append(m, buffer_ptr(&auth_debug),
733: buffer_len(&auth_debug));
734: buffer_clear(&auth_debug);
735: }
736: }
737:
738: int
1.59 avsm 739: mm_answer_keyallowed(int sock, Buffer *m)
1.1 provos 740: {
741: Key *key;
1.26 markus 742: char *cuser, *chost;
743: u_char *blob;
1.1 provos 744: u_int bloblen;
745: enum mm_keytype type = 0;
746: int allowed = 0;
747:
1.14 markus 748: debug3("%s entering", __func__);
1.3 markus 749:
1.1 provos 750: type = buffer_get_int(m);
751: cuser = buffer_get_string(m, NULL);
752: chost = buffer_get_string(m, NULL);
753: blob = buffer_get_string(m, &bloblen);
754:
755: key = key_from_blob(blob, bloblen);
756:
757: if ((compat20 && type == MM_RSAHOSTKEY) ||
758: (!compat20 && type != MM_RSAHOSTKEY))
1.14 markus 759: fatal("%s: key type and protocol mismatch", __func__);
1.1 provos 760:
1.14 markus 761: debug3("%s: key_from_blob: %p", __func__, key);
1.1 provos 762:
1.51 djm 763: if (key != NULL && authctxt->valid) {
1.63 deraadt 764: switch (type) {
1.1 provos 765: case MM_USERKEY:
1.12 markus 766: allowed = options.pubkey_authentication &&
767: user_key_allowed(authctxt->pw, key);
1.77 dtucker 768: auth_method = "publickey";
1.97 dtucker 769: if (options.pubkey_authentication && allowed != 1)
770: auth_clear_options();
1.1 provos 771: break;
772: case MM_HOSTKEY:
1.12 markus 773: allowed = options.hostbased_authentication &&
774: hostbased_key_allowed(authctxt->pw,
1.1 provos 775: cuser, chost, key);
1.77 dtucker 776: auth_method = "hostbased";
1.1 provos 777: break;
778: case MM_RSAHOSTKEY:
779: key->type = KEY_RSA1; /* XXX */
1.12 markus 780: allowed = options.rhosts_rsa_authentication &&
781: auth_rhosts_rsa_key_allowed(authctxt->pw,
1.1 provos 782: cuser, chost, key);
1.97 dtucker 783: if (options.rhosts_rsa_authentication && allowed != 1)
784: auth_clear_options();
1.77 dtucker 785: auth_method = "rsa";
1.1 provos 786: break;
787: default:
1.14 markus 788: fatal("%s: unknown key type %d", __func__, type);
1.1 provos 789: break;
790: }
1.33 markus 791: }
792: if (key != NULL)
1.1 provos 793: key_free(key);
794:
795: /* clear temporarily storage (used by verify) */
796: monitor_reset_key_state();
797:
798: if (allowed) {
799: /* Save temporarily for comparison in verify */
800: key_blob = blob;
801: key_bloblen = bloblen;
802: key_blobtype = type;
803: hostbased_cuser = cuser;
804: hostbased_chost = chost;
1.72 djm 805: } else {
1.77 dtucker 806: /* Log failed attempt */
807: auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
1.72 djm 808: xfree(blob);
809: xfree(cuser);
810: xfree(chost);
1.1 provos 811: }
812:
813: debug3("%s: key %p is %s",
1.98 dtucker 814: __func__, key, allowed ? "allowed" : "not allowed");
1.1 provos 815:
816: buffer_clear(m);
817: buffer_put_int(m, allowed);
1.32 markus 818: buffer_put_int(m, forced_command != NULL);
1.1 provos 819:
820: mm_append_debug(m);
821:
1.59 avsm 822: mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
1.1 provos 823:
824: if (type == MM_RSAHOSTKEY)
825: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
826:
827: return (0);
828: }
829:
830: static int
831: monitor_valid_userblob(u_char *data, u_int datalen)
832: {
833: Buffer b;
1.26 markus 834: char *p;
1.1 provos 835: u_int len;
836: int fail = 0;
837:
838: buffer_init(&b);
839: buffer_append(&b, data, datalen);
1.3 markus 840:
1.1 provos 841: if (datafellows & SSH_OLD_SESSIONID) {
1.13 markus 842: p = buffer_ptr(&b);
843: len = buffer_len(&b);
844: if ((session_id2 == NULL) ||
845: (len < session_id2_len) ||
846: (memcmp(p, session_id2, session_id2_len) != 0))
847: fail++;
1.1 provos 848: buffer_consume(&b, session_id2_len);
849: } else {
1.13 markus 850: p = buffer_get_string(&b, &len);
851: if ((session_id2 == NULL) ||
852: (len != session_id2_len) ||
853: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 854: fail++;
1.13 markus 855: xfree(p);
1.1 provos 856: }
857: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
858: fail++;
859: p = buffer_get_string(&b, NULL);
860: if (strcmp(authctxt->user, p) != 0) {
1.38 itojun 861: logit("wrong user name passed to monitor: expected %s != %.100s",
1.1 provos 862: authctxt->user, p);
863: fail++;
864: }
865: xfree(p);
866: buffer_skip_string(&b);
867: if (datafellows & SSH_BUG_PKAUTH) {
868: if (!buffer_get_char(&b))
869: fail++;
870: } else {
871: p = buffer_get_string(&b, NULL);
872: if (strcmp("publickey", p) != 0)
873: fail++;
874: xfree(p);
875: if (!buffer_get_char(&b))
876: fail++;
877: buffer_skip_string(&b);
878: }
879: buffer_skip_string(&b);
880: if (buffer_len(&b) != 0)
881: fail++;
882: buffer_free(&b);
883: return (fail == 0);
884: }
885:
886: static int
1.26 markus 887: monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
888: char *chost)
1.1 provos 889: {
890: Buffer b;
1.26 markus 891: char *p;
1.1 provos 892: u_int len;
893: int fail = 0;
894:
895: buffer_init(&b);
896: buffer_append(&b, data, datalen);
1.3 markus 897:
1.13 markus 898: p = buffer_get_string(&b, &len);
899: if ((session_id2 == NULL) ||
900: (len != session_id2_len) ||
901: (memcmp(p, session_id2, session_id2_len) != 0))
1.1 provos 902: fail++;
1.13 markus 903: xfree(p);
904:
1.1 provos 905: if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
906: fail++;
907: p = buffer_get_string(&b, NULL);
908: if (strcmp(authctxt->user, p) != 0) {
1.38 itojun 909: logit("wrong user name passed to monitor: expected %s != %.100s",
1.1 provos 910: authctxt->user, p);
911: fail++;
912: }
913: xfree(p);
914: buffer_skip_string(&b); /* service */
915: p = buffer_get_string(&b, NULL);
916: if (strcmp(p, "hostbased") != 0)
917: fail++;
918: xfree(p);
919: buffer_skip_string(&b); /* pkalg */
920: buffer_skip_string(&b); /* pkblob */
921:
922: /* verify client host, strip trailing dot if necessary */
923: p = buffer_get_string(&b, NULL);
924: if (((len = strlen(p)) > 0) && p[len - 1] == '.')
925: p[len - 1] = '\0';
926: if (strcmp(p, chost) != 0)
927: fail++;
928: xfree(p);
929:
930: /* verify client user */
931: p = buffer_get_string(&b, NULL);
932: if (strcmp(p, cuser) != 0)
933: fail++;
934: xfree(p);
935:
936: if (buffer_len(&b) != 0)
937: fail++;
938: buffer_free(&b);
939: return (fail == 0);
940: }
941:
942: int
1.59 avsm 943: mm_answer_keyverify(int sock, Buffer *m)
1.1 provos 944: {
945: Key *key;
946: u_char *signature, *data, *blob;
947: u_int signaturelen, datalen, bloblen;
948: int verified = 0;
949: int valid_data = 0;
950:
951: blob = buffer_get_string(m, &bloblen);
952: signature = buffer_get_string(m, &signaturelen);
953: data = buffer_get_string(m, &datalen);
954:
955: if (hostbased_cuser == NULL || hostbased_chost == NULL ||
1.8 mouring 956: !monitor_allowed_key(blob, bloblen))
1.14 markus 957: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 958:
959: key = key_from_blob(blob, bloblen);
960: if (key == NULL)
1.14 markus 961: fatal("%s: bad public key blob", __func__);
1.1 provos 962:
963: switch (key_blobtype) {
964: case MM_USERKEY:
965: valid_data = monitor_valid_userblob(data, datalen);
966: break;
967: case MM_HOSTKEY:
968: valid_data = monitor_valid_hostbasedblob(data, datalen,
969: hostbased_cuser, hostbased_chost);
970: break;
971: default:
972: valid_data = 0;
973: break;
974: }
975: if (!valid_data)
1.14 markus 976: fatal("%s: bad signature data blob", __func__);
1.1 provos 977:
978: verified = key_verify(key, signature, signaturelen, data, datalen);
979: debug3("%s: key %p signature %s",
1.89 markus 980: __func__, key, (verified == 1) ? "verified" : "unverified");
1.1 provos 981:
982: key_free(key);
983: xfree(blob);
984: xfree(signature);
985: xfree(data);
986:
1.17 stevesk 987: auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
988:
1.1 provos 989: monitor_reset_key_state();
1.3 markus 990:
1.1 provos 991: buffer_clear(m);
992: buffer_put_int(m, verified);
1.59 avsm 993: mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
1.1 provos 994:
1.89 markus 995: return (verified == 1);
1.1 provos 996: }
997:
1.2 markus 998: static void
1.1 provos 999: mm_record_login(Session *s, struct passwd *pw)
1000: {
1001: socklen_t fromlen;
1002: struct sockaddr_storage from;
1003:
1004: /*
1005: * Get IP address of client. If the connection is not a socket, let
1006: * the address be 0.0.0.0.
1007: */
1008: memset(&from, 0, sizeof(from));
1.24 stevesk 1009: fromlen = sizeof(from);
1.1 provos 1010: if (packet_connection_is_on_socket()) {
1011: if (getpeername(packet_get_connection_in(),
1.74 deraadt 1012: (struct sockaddr *)&from, &fromlen) < 0) {
1.1 provos 1013: debug("getpeername: %.100s", strerror(errno));
1.50 markus 1014: cleanup_exit(255);
1.1 provos 1015: }
1016: }
1017: /* Record that there was a login on that tty from the remote host. */
1018: record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
1.42 markus 1019: get_remote_name_or_ip(utmp_len, options.use_dns),
1.24 stevesk 1020: (struct sockaddr *)&from, fromlen);
1.1 provos 1021: }
1022:
1023: static void
1024: mm_session_close(Session *s)
1025: {
1.41 djm 1026: debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
1.1 provos 1027: if (s->ttyfd != -1) {
1.86 stevesk 1028: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
1.1 provos 1029: session_pty_cleanup2(s);
1030: }
1.96 djm 1031: session_unused(s->self);
1.1 provos 1032: }
1033:
1034: int
1.59 avsm 1035: mm_answer_pty(int sock, Buffer *m)
1.1 provos 1036: {
1.11 mouring 1037: extern struct monitor *pmonitor;
1.1 provos 1038: Session *s;
1039: int res, fd0;
1040:
1.14 markus 1041: debug3("%s entering", __func__);
1.1 provos 1042:
1043: buffer_clear(m);
1044: s = session_new();
1045: if (s == NULL)
1046: goto error;
1047: s->authctxt = authctxt;
1048: s->pw = authctxt->pw;
1.11 mouring 1049: s->pid = pmonitor->m_pid;
1.1 provos 1050: res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
1051: if (res == 0)
1052: goto error;
1053: pty_setowner(authctxt->pw, s->tty);
1054:
1055: buffer_put_int(m, 1);
1056: buffer_put_cstring(m, s->tty);
1057:
1058: /* We need to trick ttyslot */
1059: if (dup2(s->ttyfd, 0) == -1)
1.14 markus 1060: fatal("%s: dup2", __func__);
1.1 provos 1061:
1062: mm_record_login(s, authctxt->pw);
1063:
1064: /* Now we can close the file descriptor again */
1065: close(0);
1.61 dtucker 1066:
1067: /* send messages generated by record_login */
1068: buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
1069: buffer_clear(&loginmsg);
1070:
1071: mm_request_send(sock, MONITOR_ANS_PTY, m);
1072:
1.92 djm 1073: if (mm_send_fd(sock, s->ptyfd) == -1 ||
1074: mm_send_fd(sock, s->ttyfd) == -1)
1075: fatal("%s: send fds failed", __func__);
1.1 provos 1076:
1077: /* make sure nothing uses fd 0 */
1078: if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
1.14 markus 1079: fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
1.1 provos 1080: if (fd0 != 0)
1.14 markus 1081: error("%s: fd0 %d != 0", __func__, fd0);
1.1 provos 1082:
1083: /* slave is not needed */
1084: close(s->ttyfd);
1085: s->ttyfd = s->ptyfd;
1086: /* no need to dup() because nobody closes ptyfd */
1087: s->ptymaster = s->ptyfd;
1088:
1.86 stevesk 1089: debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
1.1 provos 1090:
1091: return (0);
1092:
1093: error:
1094: if (s != NULL)
1095: mm_session_close(s);
1096: buffer_put_int(m, 0);
1.59 avsm 1097: mm_request_send(sock, MONITOR_ANS_PTY, m);
1.1 provos 1098: return (0);
1099: }
1100:
1101: int
1.59 avsm 1102: mm_answer_pty_cleanup(int sock, Buffer *m)
1.1 provos 1103: {
1104: Session *s;
1105: char *tty;
1106:
1.14 markus 1107: debug3("%s entering", __func__);
1.1 provos 1108:
1109: tty = buffer_get_string(m, NULL);
1110: if ((s = session_by_tty(tty)) != NULL)
1111: mm_session_close(s);
1112: buffer_clear(m);
1113: xfree(tty);
1114: return (0);
1115: }
1116:
1117: int
1.59 avsm 1118: mm_answer_sesskey(int sock, Buffer *m)
1.1 provos 1119: {
1120: BIGNUM *p;
1121: int rsafail;
1122:
1123: /* Turn off permissions */
1.62 dtucker 1124: monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
1.1 provos 1125:
1126: if ((p = BN_new()) == NULL)
1.14 markus 1127: fatal("%s: BN_new", __func__);
1.1 provos 1128:
1129: buffer_get_bignum2(m, p);
1130:
1131: rsafail = ssh1_session_key(p);
1132:
1133: buffer_clear(m);
1134: buffer_put_int(m, rsafail);
1135: buffer_put_bignum2(m, p);
1136:
1137: BN_clear_free(p);
1138:
1.59 avsm 1139: mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
1.1 provos 1140:
1141: /* Turn on permissions for sessid passing */
1142: monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
1143:
1144: return (0);
1145: }
1146:
1147: int
1.59 avsm 1148: mm_answer_sessid(int sock, Buffer *m)
1.1 provos 1149: {
1150: int i;
1151:
1.14 markus 1152: debug3("%s entering", __func__);
1.1 provos 1153:
1154: if (buffer_len(m) != 16)
1.14 markus 1155: fatal("%s: bad ssh1 session id", __func__);
1.1 provos 1156: for (i = 0; i < 16; i++)
1157: session_id[i] = buffer_get_char(m);
1158:
1159: /* Turn on permissions for getpwnam */
1160: monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
1161:
1162: return (0);
1163: }
1164:
1165: int
1.59 avsm 1166: mm_answer_rsa_keyallowed(int sock, Buffer *m)
1.1 provos 1167: {
1168: BIGNUM *client_n;
1169: Key *key = NULL;
1.3 markus 1170: u_char *blob = NULL;
1171: u_int blen = 0;
1.1 provos 1172: int allowed = 0;
1173:
1.14 markus 1174: debug3("%s entering", __func__);
1.1 provos 1175:
1.77 dtucker 1176: auth_method = "rsa";
1.12 markus 1177: if (options.rsa_authentication && authctxt->valid) {
1.1 provos 1178: if ((client_n = BN_new()) == NULL)
1.14 markus 1179: fatal("%s: BN_new", __func__);
1.1 provos 1180: buffer_get_bignum2(m, client_n);
1181: allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
1182: BN_clear_free(client_n);
1183: }
1184: buffer_clear(m);
1185: buffer_put_int(m, allowed);
1.32 markus 1186: buffer_put_int(m, forced_command != NULL);
1.1 provos 1187:
1188: /* clear temporarily storage (used by generate challenge) */
1189: monitor_reset_key_state();
1190:
1191: if (allowed && key != NULL) {
1192: key->type = KEY_RSA; /* cheat for key_to_blob */
1193: if (key_to_blob(key, &blob, &blen) == 0)
1.14 markus 1194: fatal("%s: key_to_blob failed", __func__);
1.1 provos 1195: buffer_put_string(m, blob, blen);
1196:
1197: /* Save temporarily for comparison in verify */
1198: key_blob = blob;
1199: key_bloblen = blen;
1200: key_blobtype = MM_RSAUSERKEY;
1.33 markus 1201: }
1202: if (key != NULL)
1.1 provos 1203: key_free(key);
1204:
1205: mm_append_debug(m);
1206:
1.59 avsm 1207: mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
1.1 provos 1208:
1209: monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
1210: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
1211: return (0);
1212: }
1213:
1214: int
1.59 avsm 1215: mm_answer_rsa_challenge(int sock, Buffer *m)
1.1 provos 1216: {
1217: Key *key = NULL;
1.3 markus 1218: u_char *blob;
1219: u_int blen;
1.1 provos 1220:
1.14 markus 1221: debug3("%s entering", __func__);
1.1 provos 1222:
1223: if (!authctxt->valid)
1.14 markus 1224: fatal("%s: authctxt not valid", __func__);
1.1 provos 1225: blob = buffer_get_string(m, &blen);
1226: if (!monitor_allowed_key(blob, blen))
1.14 markus 1227: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1228: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1229: fatal("%s: key type mismatch", __func__);
1.1 provos 1230: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1231: fatal("%s: received bad key", __func__);
1.101 djm 1232: if (key->type != KEY_RSA)
1233: fatal("%s: received bad key type %d", __func__, key->type);
1234: key->type = KEY_RSA1;
1.1 provos 1235: if (ssh1_challenge)
1236: BN_clear_free(ssh1_challenge);
1237: ssh1_challenge = auth_rsa_generate_challenge(key);
1238:
1239: buffer_clear(m);
1240: buffer_put_bignum2(m, ssh1_challenge);
1241:
1.14 markus 1242: debug3("%s sending reply", __func__);
1.59 avsm 1243: mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
1.1 provos 1244:
1245: monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
1.33 markus 1246:
1247: xfree(blob);
1248: key_free(key);
1.1 provos 1249: return (0);
1250: }
1251:
1252: int
1.59 avsm 1253: mm_answer_rsa_response(int sock, Buffer *m)
1.1 provos 1254: {
1255: Key *key = NULL;
1.3 markus 1256: u_char *blob, *response;
1257: u_int blen, len;
1258: int success;
1.1 provos 1259:
1.14 markus 1260: debug3("%s entering", __func__);
1.1 provos 1261:
1262: if (!authctxt->valid)
1.14 markus 1263: fatal("%s: authctxt not valid", __func__);
1.1 provos 1264: if (ssh1_challenge == NULL)
1.14 markus 1265: fatal("%s: no ssh1_challenge", __func__);
1.1 provos 1266:
1267: blob = buffer_get_string(m, &blen);
1268: if (!monitor_allowed_key(blob, blen))
1.14 markus 1269: fatal("%s: bad key, not previously allowed", __func__);
1.1 provos 1270: if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
1.14 markus 1271: fatal("%s: key type mismatch: %d", __func__, key_blobtype);
1.1 provos 1272: if ((key = key_from_blob(blob, blen)) == NULL)
1.14 markus 1273: fatal("%s: received bad key", __func__);
1.1 provos 1274: response = buffer_get_string(m, &len);
1275: if (len != 16)
1.14 markus 1276: fatal("%s: received bad response to challenge", __func__);
1.1 provos 1277: success = auth_rsa_verify_response(key, ssh1_challenge, response);
1278:
1.33 markus 1279: xfree(blob);
1.1 provos 1280: key_free(key);
1281: xfree(response);
1282:
1283: auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
1284:
1285: /* reset state */
1286: BN_clear_free(ssh1_challenge);
1287: ssh1_challenge = NULL;
1288: monitor_reset_key_state();
1289:
1290: buffer_clear(m);
1291: buffer_put_int(m, success);
1.59 avsm 1292: mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
1.1 provos 1293:
1294: return (success);
1295: }
1296:
1297: int
1.59 avsm 1298: mm_answer_term(int sock, Buffer *req)
1.1 provos 1299: {
1.11 mouring 1300: extern struct monitor *pmonitor;
1.1 provos 1301: int res, status;
1302:
1.14 markus 1303: debug3("%s: tearing down sessions", __func__);
1.1 provos 1304:
1305: /* The child is terminating */
1306: session_destroy_all(&mm_session_close);
1307:
1.11 mouring 1308: while (waitpid(pmonitor->m_pid, &status, 0) == -1)
1.9 markus 1309: if (errno != EINTR)
1310: exit(1);
1.1 provos 1311:
1312: res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
1313:
1314: /* Terminate process */
1.57 deraadt 1315: exit(res);
1.1 provos 1316: }
1317:
1318: void
1.11 mouring 1319: monitor_apply_keystate(struct monitor *pmonitor)
1.1 provos 1320: {
1321: if (compat20) {
1322: set_newkeys(MODE_IN);
1323: set_newkeys(MODE_OUT);
1324: } else {
1325: packet_set_protocol_flags(child_state.ssh1protoflags);
1.15 markus 1326: packet_set_encryption_key(child_state.ssh1key,
1327: child_state.ssh1keylen, child_state.ssh1cipher);
1328: xfree(child_state.ssh1key);
1.1 provos 1329: }
1330:
1.15 markus 1331: /* for rc4 and other stateful ciphers */
1.1 provos 1332: packet_set_keycontext(MODE_OUT, child_state.keyout);
1333: xfree(child_state.keyout);
1334: packet_set_keycontext(MODE_IN, child_state.keyin);
1335: xfree(child_state.keyin);
1336:
1337: if (!compat20) {
1338: packet_set_iv(MODE_OUT, child_state.ivout);
1339: xfree(child_state.ivout);
1340: packet_set_iv(MODE_IN, child_state.ivin);
1341: xfree(child_state.ivin);
1342: }
1343:
1344: memcpy(&incoming_stream, &child_state.incoming,
1345: sizeof(incoming_stream));
1346: memcpy(&outgoing_stream, &child_state.outgoing,
1347: sizeof(outgoing_stream));
1.3 markus 1348:
1.1 provos 1349: /* Update with new address */
1.16 djm 1350: if (options.compression)
1351: mm_init_compression(pmonitor->m_zlib);
1.1 provos 1352:
1353: /* Network I/O buffers */
1354: /* XXX inefficient for large buffers, need: buffer_init_from_string */
1.102 andreas 1355: buffer_clear(packet_get_input());
1356: buffer_append(packet_get_input(), child_state.input, child_state.ilen);
1.1 provos 1357: memset(child_state.input, 0, child_state.ilen);
1358: xfree(child_state.input);
1359:
1.102 andreas 1360: buffer_clear(packet_get_output());
1361: buffer_append(packet_get_output(), child_state.output,
1362: child_state.olen);
1.1 provos 1363: memset(child_state.output, 0, child_state.olen);
1364: xfree(child_state.output);
1.103 andreas 1365:
1366: /* Roaming */
1367: if (compat20)
1368: roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
1.1 provos 1369: }
1370:
1.2 markus 1371: static Kex *
1.1 provos 1372: mm_get_kex(Buffer *m)
1373: {
1374: Kex *kex;
1375: void *blob;
1376: u_int bloblen;
1377:
1.75 djm 1378: kex = xcalloc(1, sizeof(*kex));
1.1 provos 1379: kex->session_id = buffer_get_string(m, &kex->session_id_len);
1.13 markus 1380: if ((session_id2 == NULL) ||
1381: (kex->session_id_len != session_id2_len) ||
1382: (memcmp(kex->session_id, session_id2, session_id2_len) != 0))
1383: fatal("mm_get_get: internal error: bad session id");
1.1 provos 1384: kex->we_need = buffer_get_int(m);
1.34 markus 1385: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
1.58 djm 1386: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
1.34 markus 1387: kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
1.69 djm 1388: kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
1.1 provos 1389: kex->server = 1;
1390: kex->hostkey_type = buffer_get_int(m);
1391: kex->kex_type = buffer_get_int(m);
1392: blob = buffer_get_string(m, &bloblen);
1393: buffer_init(&kex->my);
1394: buffer_append(&kex->my, blob, bloblen);
1395: xfree(blob);
1396: blob = buffer_get_string(m, &bloblen);
1397: buffer_init(&kex->peer);
1398: buffer_append(&kex->peer, blob, bloblen);
1399: xfree(blob);
1400: kex->done = 1;
1401: kex->flags = buffer_get_int(m);
1402: kex->client_version_string = buffer_get_string(m, NULL);
1403: kex->server_version_string = buffer_get_string(m, NULL);
1404: kex->load_host_key=&get_hostkey_by_type;
1405: kex->host_key_index=&get_hostkey_index;
1406:
1407: return (kex);
1408: }
1409:
1410: /* This function requries careful sanity checking */
1411:
1412: void
1.11 mouring 1413: mm_get_keystate(struct monitor *pmonitor)
1.1 provos 1414: {
1415: Buffer m;
1416: u_char *blob, *p;
1417: u_int bloblen, plen;
1.37 markus 1418: u_int32_t seqnr, packets;
1.99 markus 1419: u_int64_t blocks, bytes;
1.1 provos 1420:
1.14 markus 1421: debug3("%s: Waiting for new keys", __func__);
1.1 provos 1422:
1423: buffer_init(&m);
1.11 mouring 1424: mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
1.1 provos 1425: if (!compat20) {
1426: child_state.ssh1protoflags = buffer_get_int(&m);
1427: child_state.ssh1cipher = buffer_get_int(&m);
1.15 markus 1428: child_state.ssh1key = buffer_get_string(&m,
1429: &child_state.ssh1keylen);
1.1 provos 1430: child_state.ivout = buffer_get_string(&m,
1431: &child_state.ivoutlen);
1432: child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
1433: goto skip;
1434: } else {
1435: /* Get the Kex for rekeying */
1.11 mouring 1436: *pmonitor->m_pkex = mm_get_kex(&m);
1.1 provos 1437: }
1438:
1439: blob = buffer_get_string(&m, &bloblen);
1440: current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
1441: xfree(blob);
1442:
1.14 markus 1443: debug3("%s: Waiting for second key", __func__);
1.1 provos 1444: blob = buffer_get_string(&m, &bloblen);
1445: current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
1446: xfree(blob);
1.3 markus 1447:
1.1 provos 1448: /* Now get sequence numbers for the packets */
1.37 markus 1449: seqnr = buffer_get_int(&m);
1450: blocks = buffer_get_int64(&m);
1451: packets = buffer_get_int(&m);
1.99 markus 1452: bytes = buffer_get_int64(&m);
1453: packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
1.37 markus 1454: seqnr = buffer_get_int(&m);
1455: blocks = buffer_get_int64(&m);
1456: packets = buffer_get_int(&m);
1.99 markus 1457: bytes = buffer_get_int64(&m);
1458: packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
1.1 provos 1459:
1460: skip:
1461: /* Get the key context */
1462: child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
1463: child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
1464:
1.14 markus 1465: debug3("%s: Getting compression state", __func__);
1.1 provos 1466: /* Get compression state */
1467: p = buffer_get_string(&m, &plen);
1468: if (plen != sizeof(child_state.outgoing))
1.14 markus 1469: fatal("%s: bad request size", __func__);
1.1 provos 1470: memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
1471: xfree(p);
1472:
1473: p = buffer_get_string(&m, &plen);
1474: if (plen != sizeof(child_state.incoming))
1.14 markus 1475: fatal("%s: bad request size", __func__);
1.1 provos 1476: memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
1477: xfree(p);
1478:
1479: /* Network I/O buffers */
1.14 markus 1480: debug3("%s: Getting Network I/O buffers", __func__);
1.1 provos 1481: child_state.input = buffer_get_string(&m, &child_state.ilen);
1482: child_state.output = buffer_get_string(&m, &child_state.olen);
1.103 andreas 1483:
1484: /* Roaming */
1485: if (compat20) {
1486: child_state.sent_bytes = buffer_get_int64(&m);
1487: child_state.recv_bytes = buffer_get_int64(&m);
1488: }
1.1 provos 1489:
1490: buffer_free(&m);
1491: }
1492:
1493:
1494: /* Allocation functions for zlib */
1495: void *
1496: mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
1497: {
1.30 markus 1498: size_t len = (size_t) size * ncount;
1.1 provos 1499: void *address;
1500:
1.23 millert 1501: if (len == 0 || ncount > SIZE_T_MAX / size)
1.18 deraadt 1502: fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
1503:
1504: address = mm_malloc(mm, len);
1.1 provos 1505:
1506: return (address);
1507: }
1508:
1509: void
1510: mm_zfree(struct mm_master *mm, void *address)
1511: {
1512: mm_free(mm, address);
1513: }
1514:
1515: void
1516: mm_init_compression(struct mm_master *mm)
1517: {
1518: outgoing_stream.zalloc = (alloc_func)mm_zalloc;
1519: outgoing_stream.zfree = (free_func)mm_zfree;
1520: outgoing_stream.opaque = mm;
1521:
1522: incoming_stream.zalloc = (alloc_func)mm_zalloc;
1523: incoming_stream.zfree = (free_func)mm_zfree;
1524: incoming_stream.opaque = mm;
1525: }
1526:
1527: /* XXX */
1528:
1529: #define FD_CLOSEONEXEC(x) do { \
1530: if (fcntl(x, F_SETFD, 1) == -1) \
1531: fatal("fcntl(%d, F_SETFD)", x); \
1532: } while (0)
1533:
1.2 markus 1534: static void
1.1 provos 1535: monitor_socketpair(int *pair)
1.3 markus 1536: {
1.1 provos 1537: if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
1.14 markus 1538: fatal("%s: socketpair", __func__);
1.1 provos 1539: FD_CLOSEONEXEC(pair[0]);
1540: FD_CLOSEONEXEC(pair[1]);
1541: }
1542:
1543: #define MM_MEMSIZE 65536
1544:
1545: struct monitor *
1546: monitor_init(void)
1547: {
1548: struct monitor *mon;
1549: int pair[2];
1550:
1.75 djm 1551: mon = xcalloc(1, sizeof(*mon));
1.1 provos 1552:
1553: monitor_socketpair(pair);
1554:
1555: mon->m_recvfd = pair[0];
1556: mon->m_sendfd = pair[1];
1557:
1558: /* Used to share zlib space across processes */
1.16 djm 1559: if (options.compression) {
1560: mon->m_zback = mm_create(NULL, MM_MEMSIZE);
1561: mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
1.1 provos 1562:
1.16 djm 1563: /* Compression needs to share state across borders */
1564: mm_init_compression(mon->m_zlib);
1565: }
1.1 provos 1566:
1567: return mon;
1568: }
1569:
1570: void
1571: monitor_reinit(struct monitor *mon)
1572: {
1573: int pair[2];
1574:
1575: monitor_socketpair(pair);
1576:
1577: mon->m_recvfd = pair[0];
1578: mon->m_sendfd = pair[1];
1579: }
1.46 markus 1580:
1581: #ifdef GSSAPI
1582: int
1.59 avsm 1583: mm_answer_gss_setup_ctx(int sock, Buffer *m)
1.46 markus 1584: {
1.59 avsm 1585: gss_OID_desc goid;
1.46 markus 1586: OM_uint32 major;
1587: u_int len;
1588:
1.59 avsm 1589: goid.elements = buffer_get_string(m, &len);
1590: goid.length = len;
1.46 markus 1591:
1.59 avsm 1592: major = ssh_gssapi_server_ctx(&gsscontext, &goid);
1.46 markus 1593:
1.59 avsm 1594: xfree(goid.elements);
1.46 markus 1595:
1596: buffer_clear(m);
1597: buffer_put_int(m, major);
1598:
1.64 stevesk 1599: mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
1.46 markus 1600:
1601: /* Now we have a context, enable the step */
1602: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
1603:
1604: return (0);
1605: }
1606:
1607: int
1.59 avsm 1608: mm_answer_gss_accept_ctx(int sock, Buffer *m)
1.46 markus 1609: {
1610: gss_buffer_desc in;
1611: gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
1.64 stevesk 1612: OM_uint32 major, minor;
1.46 markus 1613: OM_uint32 flags = 0; /* GSI needs this */
1.47 deraadt 1614: u_int len;
1.46 markus 1615:
1.47 deraadt 1616: in.value = buffer_get_string(m, &len);
1617: in.length = len;
1.46 markus 1618: major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
1619: xfree(in.value);
1620:
1621: buffer_clear(m);
1622: buffer_put_int(m, major);
1623: buffer_put_string(m, out.value, out.length);
1624: buffer_put_int(m, flags);
1.59 avsm 1625: mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
1.46 markus 1626:
1627: gss_release_buffer(&minor, &out);
1628:
1.64 stevesk 1629: if (major == GSS_S_COMPLETE) {
1.46 markus 1630: monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
1631: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.52 markus 1632: monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
1.46 markus 1633: }
1634: return (0);
1635: }
1636:
1637: int
1.59 avsm 1638: mm_answer_gss_checkmic(int sock, Buffer *m)
1.52 markus 1639: {
1640: gss_buffer_desc gssbuf, mic;
1641: OM_uint32 ret;
1642: u_int len;
1.54 djm 1643:
1.52 markus 1644: gssbuf.value = buffer_get_string(m, &len);
1645: gssbuf.length = len;
1646: mic.value = buffer_get_string(m, &len);
1647: mic.length = len;
1.54 djm 1648:
1.52 markus 1649: ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
1.54 djm 1650:
1.52 markus 1651: xfree(gssbuf.value);
1652: xfree(mic.value);
1.54 djm 1653:
1.52 markus 1654: buffer_clear(m);
1655: buffer_put_int(m, ret);
1.54 djm 1656:
1.59 avsm 1657: mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
1.54 djm 1658:
1.52 markus 1659: if (!GSS_ERROR(ret))
1660: monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
1.54 djm 1661:
1.52 markus 1662: return (0);
1663: }
1664:
1665: int
1.59 avsm 1666: mm_answer_gss_userok(int sock, Buffer *m)
1.46 markus 1667: {
1668: int authenticated;
1669:
1670: authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
1671:
1672: buffer_clear(m);
1673: buffer_put_int(m, authenticated);
1674:
1675: debug3("%s: sending result %d", __func__, authenticated);
1.59 avsm 1676: mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
1.46 markus 1677:
1.64 stevesk 1678: auth_method = "gssapi-with-mic";
1.46 markus 1679:
1680: /* Monitor loop will terminate if authenticated */
1681: return (authenticated);
1682: }
1683: #endif /* GSSAPI */
1.100 djm 1684:
1685: #ifdef JPAKE
1686: int
1687: mm_answer_jpake_step1(int sock, Buffer *m)
1688: {
1689: struct jpake_ctx *pctx;
1690: u_char *x3_proof, *x4_proof;
1691: u_int x3_proof_len, x4_proof_len;
1692:
1693: if (!options.zero_knowledge_password_authentication)
1694: fatal("zero_knowledge_password_authentication disabled");
1695:
1696: if (authctxt->jpake_ctx != NULL)
1697: fatal("%s: authctxt->jpake_ctx already set (%p)",
1698: __func__, authctxt->jpake_ctx);
1699: authctxt->jpake_ctx = pctx = jpake_new();
1700:
1701: jpake_step1(pctx->grp,
1702: &pctx->server_id, &pctx->server_id_len,
1703: &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
1704: &x3_proof, &x3_proof_len,
1705: &x4_proof, &x4_proof_len);
1706:
1707: JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
1708:
1709: buffer_clear(m);
1710:
1711: buffer_put_string(m, pctx->server_id, pctx->server_id_len);
1712: buffer_put_bignum2(m, pctx->g_x3);
1713: buffer_put_bignum2(m, pctx->g_x4);
1714: buffer_put_string(m, x3_proof, x3_proof_len);
1715: buffer_put_string(m, x4_proof, x4_proof_len);
1716:
1717: debug3("%s: sending step1", __func__);
1718: mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
1719:
1720: bzero(x3_proof, x3_proof_len);
1721: bzero(x4_proof, x4_proof_len);
1722: xfree(x3_proof);
1723: xfree(x4_proof);
1724:
1725: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
1726: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
1727:
1728: return 0;
1729: }
1730:
1731: int
1732: mm_answer_jpake_get_pwdata(int sock, Buffer *m)
1733: {
1734: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1735: char *hash_scheme, *salt;
1736:
1737: if (pctx == NULL)
1738: fatal("%s: pctx == NULL", __func__);
1739:
1740: auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
1741:
1742: buffer_clear(m);
1743: /* pctx->s is sensitive, not returned to slave */
1744: buffer_put_cstring(m, hash_scheme);
1745: buffer_put_cstring(m, salt);
1746:
1747: debug3("%s: sending pwdata", __func__);
1748: mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
1749:
1750: bzero(hash_scheme, strlen(hash_scheme));
1751: bzero(salt, strlen(salt));
1752: xfree(hash_scheme);
1753: xfree(salt);
1754:
1755: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
1756:
1757: return 0;
1758: }
1759:
1760: int
1761: mm_answer_jpake_step2(int sock, Buffer *m)
1762: {
1763: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1764: u_char *x1_proof, *x2_proof, *x4_s_proof;
1765: u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
1766:
1767: if (pctx == NULL)
1768: fatal("%s: pctx == NULL", __func__);
1769:
1770: if ((pctx->g_x1 = BN_new()) == NULL ||
1771: (pctx->g_x2 = BN_new()) == NULL)
1772: fatal("%s: BN_new", __func__);
1773: buffer_get_bignum2(m, pctx->g_x1);
1774: buffer_get_bignum2(m, pctx->g_x2);
1775: pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
1776: x1_proof = buffer_get_string(m, &x1_proof_len);
1777: x2_proof = buffer_get_string(m, &x2_proof_len);
1778:
1779: jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
1780: pctx->g_x1, pctx->g_x2, pctx->x4,
1781: pctx->client_id, pctx->client_id_len,
1782: pctx->server_id, pctx->server_id_len,
1783: x1_proof, x1_proof_len,
1784: x2_proof, x2_proof_len,
1785: &pctx->b,
1786: &x4_s_proof, &x4_s_proof_len);
1787:
1788: JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
1789:
1790: bzero(x1_proof, x1_proof_len);
1791: bzero(x2_proof, x2_proof_len);
1792: xfree(x1_proof);
1793: xfree(x2_proof);
1794:
1795: buffer_clear(m);
1796:
1797: buffer_put_bignum2(m, pctx->b);
1798: buffer_put_string(m, x4_s_proof, x4_s_proof_len);
1799:
1800: debug3("%s: sending step2", __func__);
1801: mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
1802:
1803: bzero(x4_s_proof, x4_s_proof_len);
1804: xfree(x4_s_proof);
1805:
1806: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
1807:
1808: return 0;
1809: }
1810:
1811: int
1812: mm_answer_jpake_key_confirm(int sock, Buffer *m)
1813: {
1814: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1815: u_char *x2_s_proof;
1816: u_int x2_s_proof_len;
1817:
1818: if (pctx == NULL)
1819: fatal("%s: pctx == NULL", __func__);
1820:
1821: if ((pctx->a = BN_new()) == NULL)
1822: fatal("%s: BN_new", __func__);
1823: buffer_get_bignum2(m, pctx->a);
1824: x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
1825:
1826: jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
1827: pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
1828: pctx->server_id, pctx->server_id_len,
1829: pctx->client_id, pctx->client_id_len,
1830: session_id2, session_id2_len,
1831: x2_s_proof, x2_s_proof_len,
1832: &pctx->k,
1833: &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
1834:
1835: JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
1836:
1837: bzero(x2_s_proof, x2_s_proof_len);
1838: buffer_clear(m);
1839:
1840: /* pctx->k is sensitive, not sent */
1841: buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
1842:
1843: debug3("%s: sending confirmation hash", __func__);
1844: mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
1845:
1846: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
1847:
1848: return 0;
1849: }
1850:
1851: int
1852: mm_answer_jpake_check_confirm(int sock, Buffer *m)
1853: {
1854: int authenticated = 0;
1855: u_char *peer_confirm_hash;
1856: u_int peer_confirm_hash_len;
1857: struct jpake_ctx *pctx = authctxt->jpake_ctx;
1858:
1859: if (pctx == NULL)
1860: fatal("%s: pctx == NULL", __func__);
1861:
1862: peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
1863:
1864: authenticated = jpake_check_confirm(pctx->k,
1865: pctx->client_id, pctx->client_id_len,
1866: session_id2, session_id2_len,
1867: peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
1868:
1869: JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
1870:
1871: bzero(peer_confirm_hash, peer_confirm_hash_len);
1872: xfree(peer_confirm_hash);
1873:
1874: buffer_clear(m);
1875: buffer_put_int(m, authenticated);
1876:
1877: debug3("%s: sending result %d", __func__, authenticated);
1878: mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
1879:
1880: monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
1881:
1882: auth_method = "jpake-01@openssh.com";
1883: return authenticated;
1884: }
1885:
1886: #endif /* JPAKE */
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