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1853d1ef | 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" | |
802e01b8 | 28 | RCSID("$OpenBSD: monitor.c,v 1.39 2003/05/14 02:15:47 markus Exp $"); |
1853d1ef | 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; | |
9459414c | 86 | u_char *ssh1key; |
87 | u_int ssh1keylen; | |
1853d1ef | 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 *); | |
94a73cdc | 101 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 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 | ||
ad200abb | 119 | #ifdef USE_PAM |
120 | int mm_answer_pam_start(int, Buffer *); | |
05114c74 | 121 | int mm_answer_pam_init_ctx(int, Buffer *); |
122 | int mm_answer_pam_query(int, Buffer *); | |
123 | int mm_answer_pam_respond(int, Buffer *); | |
124 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 125 | #endif |
126 | ||
2db9d8aa | 127 | #ifdef KRB4 |
128 | int mm_answer_krb4(int, Buffer *); | |
129 | #endif | |
696f6bef | 130 | #ifdef KRB5 |
131 | int mm_answer_krb5(int, Buffer *); | |
132 | #endif | |
133 | ||
1853d1ef | 134 | static Authctxt *authctxt; |
135 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
136 | ||
137 | /* local state for key verify */ | |
138 | static u_char *key_blob = NULL; | |
139 | static u_int key_bloblen = 0; | |
140 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 141 | static char *hostbased_cuser = NULL; |
142 | static char *hostbased_chost = NULL; | |
1853d1ef | 143 | static char *auth_method = "unknown"; |
521d606b | 144 | static int session_id2_len = 0; |
145 | static u_char *session_id2 = NULL; | |
1853d1ef | 146 | |
147 | struct mon_table { | |
148 | enum monitor_reqtype type; | |
149 | int flags; | |
150 | int (*f)(int, Buffer *); | |
151 | }; | |
152 | ||
153 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
154 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
155 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
156 | ||
157 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
158 | ||
159 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
160 | ||
161 | struct mon_table mon_dispatch_proto20[] = { | |
162 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
163 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
164 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
165 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 166 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 167 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 168 | #ifdef USE_PAM |
169 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
05114c74 | 170 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
171 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
172 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
173 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 174 | #endif |
1853d1ef | 175 | #ifdef BSD_AUTH |
176 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
177 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
178 | #endif | |
179 | #ifdef SKEY | |
180 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
181 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
182 | #endif | |
183 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
184 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
802e01b8 | 185 | #ifdef KRB5 |
186 | {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5}, | |
187 | #endif | |
1853d1ef | 188 | {0, 0, NULL} |
189 | }; | |
190 | ||
191 | struct mon_table mon_dispatch_postauth20[] = { | |
192 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
193 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
194 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
195 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
196 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
197 | {0, 0, NULL} | |
198 | }; | |
199 | ||
200 | struct mon_table mon_dispatch_proto15[] = { | |
201 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
202 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
203 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
204 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
205 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
206 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
207 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
208 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
209 | #ifdef BSD_AUTH | |
210 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
211 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
212 | #endif | |
213 | #ifdef SKEY | |
214 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
215 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 216 | #endif |
217 | #ifdef USE_PAM | |
218 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
05114c74 | 219 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
220 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
221 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
222 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
696f6bef | 223 | #endif |
2db9d8aa | 224 | #ifdef KRB4 |
225 | {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4}, | |
226 | #endif | |
696f6bef | 227 | #ifdef KRB5 |
228 | {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5}, | |
1853d1ef | 229 | #endif |
230 | {0, 0, NULL} | |
231 | }; | |
232 | ||
233 | struct mon_table mon_dispatch_postauth15[] = { | |
234 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
235 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
236 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
237 | {0, 0, NULL} | |
238 | }; | |
239 | ||
240 | struct mon_table *mon_dispatch; | |
241 | ||
242 | /* Specifies if a certain message is allowed at the moment */ | |
243 | ||
244 | static void | |
245 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
246 | { | |
247 | while (ent->f != NULL) { | |
248 | if (ent->type == type) { | |
249 | ent->flags &= ~MON_PERMIT; | |
250 | ent->flags |= permit ? MON_PERMIT : 0; | |
251 | return; | |
252 | } | |
253 | ent++; | |
254 | } | |
255 | } | |
256 | ||
257 | static void | |
258 | monitor_permit_authentications(int permit) | |
259 | { | |
260 | struct mon_table *ent = mon_dispatch; | |
261 | ||
262 | while (ent->f != NULL) { | |
263 | if (ent->flags & MON_AUTH) { | |
264 | ent->flags &= ~MON_PERMIT; | |
265 | ent->flags |= permit ? MON_PERMIT : 0; | |
266 | } | |
267 | ent++; | |
268 | } | |
269 | } | |
270 | ||
271 | Authctxt * | |
b5a28cbc | 272 | monitor_child_preauth(struct monitor *pmonitor) |
1853d1ef | 273 | { |
274 | struct mon_table *ent; | |
275 | int authenticated = 0; | |
276 | ||
277 | debug3("preauth child monitor started"); | |
278 | ||
279 | if (compat20) { | |
280 | mon_dispatch = mon_dispatch_proto20; | |
281 | ||
282 | /* Permit requests for moduli and signatures */ | |
283 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
284 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
285 | } else { | |
286 | mon_dispatch = mon_dispatch_proto15; | |
287 | ||
288 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
289 | } | |
290 | ||
291 | authctxt = authctxt_new(); | |
292 | ||
293 | /* The first few requests do not require asynchronous access */ | |
294 | while (!authenticated) { | |
b5a28cbc | 295 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 296 | if (authenticated) { |
297 | if (!(ent->flags & MON_AUTHDECIDE)) | |
298 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 299 | __func__, ent->type); |
1853d1ef | 300 | if (authctxt->pw->pw_uid == 0 && |
301 | !auth_root_allowed(auth_method)) | |
302 | authenticated = 0; | |
303 | } | |
304 | ||
305 | if (ent->flags & MON_AUTHDECIDE) { | |
306 | auth_log(authctxt, authenticated, auth_method, | |
307 | compat20 ? " ssh2" : ""); | |
308 | if (!authenticated) | |
309 | authctxt->failures++; | |
310 | } | |
311 | } | |
312 | ||
313 | if (!authctxt->valid) | |
1588c277 | 314 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 315 | |
316 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 317 | __func__, authctxt->user); |
1853d1ef | 318 | |
b5a28cbc | 319 | mm_get_keystate(pmonitor); |
1853d1ef | 320 | |
321 | return (authctxt); | |
322 | } | |
323 | ||
324 | void | |
b5a28cbc | 325 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 326 | { |
327 | if (compat20) { | |
328 | mon_dispatch = mon_dispatch_postauth20; | |
329 | ||
330 | /* Permit requests for moduli and signatures */ | |
331 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
332 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
333 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
334 | ||
335 | } else { | |
336 | mon_dispatch = mon_dispatch_postauth15; | |
337 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
338 | } | |
339 | if (!no_pty_flag) { | |
340 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
341 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
342 | } | |
343 | ||
344 | for (;;) | |
b5a28cbc | 345 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 346 | } |
347 | ||
348 | void | |
b5a28cbc | 349 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 350 | { |
0496cf34 | 351 | if (options.compression) { |
352 | /* The member allocation is not visible, so sync it */ | |
353 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
354 | } | |
1853d1ef | 355 | } |
356 | ||
357 | int | |
b5a28cbc | 358 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 359 | struct mon_table **pent) |
360 | { | |
361 | Buffer m; | |
362 | int ret; | |
363 | u_char type; | |
364 | ||
365 | buffer_init(&m); | |
366 | ||
b5a28cbc | 367 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 368 | type = buffer_get_char(&m); |
369 | ||
1588c277 | 370 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 371 | |
372 | while (ent->f != NULL) { | |
373 | if (ent->type == type) | |
374 | break; | |
375 | ent++; | |
376 | } | |
377 | ||
378 | if (ent->f != NULL) { | |
379 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 380 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 381 | type); |
b5a28cbc | 382 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 383 | buffer_free(&m); |
384 | ||
385 | /* The child may use this request only once, disable it */ | |
386 | if (ent->flags & MON_ONCE) { | |
1588c277 | 387 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 388 | type); |
389 | ent->flags &= ~MON_PERMIT; | |
390 | } | |
391 | ||
392 | if (pent != NULL) | |
393 | *pent = ent; | |
394 | ||
395 | return ret; | |
396 | } | |
397 | ||
1588c277 | 398 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 399 | |
400 | /* NOTREACHED */ | |
401 | return (-1); | |
402 | } | |
403 | ||
404 | /* allowed key state */ | |
405 | static int | |
406 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
407 | { | |
408 | /* make sure key is allowed */ | |
409 | if (key_blob == NULL || key_bloblen != bloblen || | |
410 | memcmp(key_blob, blob, key_bloblen)) | |
411 | return (0); | |
412 | return (1); | |
413 | } | |
414 | ||
415 | static void | |
416 | monitor_reset_key_state(void) | |
417 | { | |
418 | /* reset state */ | |
419 | if (key_blob != NULL) | |
420 | xfree(key_blob); | |
421 | if (hostbased_cuser != NULL) | |
422 | xfree(hostbased_cuser); | |
423 | if (hostbased_chost != NULL) | |
424 | xfree(hostbased_chost); | |
425 | key_blob = NULL; | |
426 | key_bloblen = 0; | |
427 | key_blobtype = MM_NOKEY; | |
428 | hostbased_cuser = NULL; | |
429 | hostbased_chost = NULL; | |
430 | } | |
431 | ||
432 | int | |
433 | mm_answer_moduli(int socket, Buffer *m) | |
434 | { | |
435 | DH *dh; | |
436 | int min, want, max; | |
437 | ||
438 | min = buffer_get_int(m); | |
439 | want = buffer_get_int(m); | |
440 | max = buffer_get_int(m); | |
441 | ||
442 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 443 | __func__, min, want, max); |
1853d1ef | 444 | /* We need to check here, too, in case the child got corrupted */ |
445 | if (max < min || want < min || max < want) | |
446 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 447 | __func__, min, want, max); |
1853d1ef | 448 | |
449 | buffer_clear(m); | |
450 | ||
451 | dh = choose_dh(min, want, max); | |
452 | if (dh == NULL) { | |
453 | buffer_put_char(m, 0); | |
454 | return (0); | |
455 | } else { | |
456 | /* Send first bignum */ | |
457 | buffer_put_char(m, 1); | |
458 | buffer_put_bignum2(m, dh->p); | |
459 | buffer_put_bignum2(m, dh->g); | |
460 | ||
461 | DH_free(dh); | |
462 | } | |
463 | mm_request_send(socket, MONITOR_ANS_MODULI, m); | |
464 | return (0); | |
465 | } | |
466 | ||
467 | int | |
468 | mm_answer_sign(int socket, Buffer *m) | |
469 | { | |
470 | Key *key; | |
471 | u_char *p; | |
472 | u_char *signature; | |
473 | u_int siglen, datlen; | |
474 | int keyid; | |
475 | ||
1588c277 | 476 | debug3("%s", __func__); |
1853d1ef | 477 | |
478 | keyid = buffer_get_int(m); | |
479 | p = buffer_get_string(m, &datlen); | |
480 | ||
481 | if (datlen != 20) | |
d1ff09ba | 482 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 483 | |
521d606b | 484 | /* save session id, it will be passed on the first call */ |
485 | if (session_id2_len == 0) { | |
486 | session_id2_len = datlen; | |
487 | session_id2 = xmalloc(session_id2_len); | |
488 | memcpy(session_id2, p, session_id2_len); | |
489 | } | |
490 | ||
1853d1ef | 491 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 492 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 493 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 494 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 495 | |
d1ff09ba | 496 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 497 | |
498 | buffer_clear(m); | |
499 | buffer_put_string(m, signature, siglen); | |
500 | ||
501 | xfree(p); | |
502 | xfree(signature); | |
503 | ||
504 | mm_request_send(socket, MONITOR_ANS_SIGN, m); | |
505 | ||
506 | /* Turn on permissions for getpwnam */ | |
507 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
508 | ||
509 | return (0); | |
510 | } | |
511 | ||
512 | /* Retrieves the password entry and also checks if the user is permitted */ | |
513 | ||
514 | int | |
515 | mm_answer_pwnamallow(int socket, Buffer *m) | |
516 | { | |
517 | char *login; | |
518 | struct passwd *pwent; | |
519 | int allowed = 0; | |
520 | ||
1588c277 | 521 | debug3("%s", __func__); |
1853d1ef | 522 | |
523 | if (authctxt->attempt++ != 0) | |
1588c277 | 524 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 525 | |
526 | login = buffer_get_string(m, NULL); | |
527 | ||
528 | pwent = getpwnamallow(login); | |
529 | ||
530 | authctxt->user = xstrdup(login); | |
531 | setproctitle("%s [priv]", pwent ? login : "unknown"); | |
532 | xfree(login); | |
533 | ||
534 | buffer_clear(m); | |
535 | ||
536 | if (pwent == NULL) { | |
537 | buffer_put_char(m, 0); | |
538 | goto out; | |
539 | } | |
540 | ||
541 | allowed = 1; | |
542 | authctxt->pw = pwent; | |
543 | authctxt->valid = 1; | |
544 | ||
545 | buffer_put_char(m, 1); | |
546 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
547 | buffer_put_cstring(m, pwent->pw_name); | |
548 | buffer_put_cstring(m, "*"); | |
549 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 550 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 551 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 552 | #endif |
1853d1ef | 553 | buffer_put_cstring(m, pwent->pw_dir); |
554 | buffer_put_cstring(m, pwent->pw_shell); | |
555 | ||
556 | out: | |
1588c277 | 557 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
1853d1ef | 558 | mm_request_send(socket, MONITOR_ANS_PWNAM, m); |
559 | ||
560 | /* For SSHv1 allow authentication now */ | |
561 | if (!compat20) | |
562 | monitor_permit_authentications(1); | |
94a73cdc | 563 | else { |
1853d1ef | 564 | /* Allow service/style information on the auth context */ |
565 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 566 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
567 | } | |
1853d1ef | 568 | |
efe44db6 | 569 | #ifdef USE_PAM |
7fceb20d | 570 | if (options.use_pam) |
571 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 572 | #endif |
1853d1ef | 573 | |
574 | return (0); | |
575 | } | |
576 | ||
94a73cdc | 577 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
578 | { | |
579 | char *banner; | |
580 | ||
581 | buffer_clear(m); | |
582 | banner = auth2_read_banner(); | |
583 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
584 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
585 | ||
586 | if (banner != NULL) | |
30e37ee6 | 587 | xfree(banner); |
94a73cdc | 588 | |
589 | return (0); | |
590 | } | |
591 | ||
1853d1ef | 592 | int |
593 | mm_answer_authserv(int socket, Buffer *m) | |
594 | { | |
595 | monitor_permit_authentications(1); | |
596 | ||
597 | authctxt->service = buffer_get_string(m, NULL); | |
598 | authctxt->style = buffer_get_string(m, NULL); | |
599 | debug3("%s: service=%s, style=%s", | |
1588c277 | 600 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 601 | |
602 | if (strlen(authctxt->style) == 0) { | |
603 | xfree(authctxt->style); | |
604 | authctxt->style = NULL; | |
605 | } | |
606 | ||
607 | return (0); | |
608 | } | |
609 | ||
610 | int | |
611 | mm_answer_authpassword(int socket, Buffer *m) | |
612 | { | |
613 | static int call_count; | |
614 | char *passwd; | |
d341742a | 615 | int authenticated; |
616 | u_int plen; | |
1853d1ef | 617 | |
618 | passwd = buffer_get_string(m, &plen); | |
619 | /* Only authenticate if the context is valid */ | |
aa586f8e | 620 | authenticated = options.password_authentication && |
68ece370 | 621 | auth_password(authctxt, passwd) && authctxt->valid; |
1853d1ef | 622 | memset(passwd, 0, strlen(passwd)); |
623 | xfree(passwd); | |
624 | ||
625 | buffer_clear(m); | |
626 | buffer_put_int(m, authenticated); | |
627 | ||
1588c277 | 628 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 629 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
630 | ||
631 | call_count++; | |
632 | if (plen == 0 && call_count == 1) | |
633 | auth_method = "none"; | |
634 | else | |
635 | auth_method = "password"; | |
636 | ||
637 | /* Causes monitor loop to terminate if authenticated */ | |
638 | return (authenticated); | |
639 | } | |
640 | ||
641 | #ifdef BSD_AUTH | |
642 | int | |
643 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
644 | { | |
645 | char *name, *infotxt; | |
646 | u_int numprompts; | |
647 | u_int *echo_on; | |
648 | char **prompts; | |
6d6c25e3 | 649 | u_int success; |
1853d1ef | 650 | |
6d6c25e3 | 651 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
652 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 653 | |
654 | buffer_clear(m); | |
6d6c25e3 | 655 | buffer_put_int(m, success); |
656 | if (success) | |
1853d1ef | 657 | buffer_put_cstring(m, prompts[0]); |
658 | ||
6d6c25e3 | 659 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 660 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
661 | ||
6d6c25e3 | 662 | if (success) { |
1853d1ef | 663 | xfree(name); |
664 | xfree(infotxt); | |
665 | xfree(prompts); | |
666 | xfree(echo_on); | |
667 | } | |
668 | ||
669 | return (0); | |
670 | } | |
671 | ||
672 | int | |
673 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
674 | { | |
675 | char *response; | |
676 | int authok; | |
677 | ||
678 | if (authctxt->as == 0) | |
1588c277 | 679 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 680 | |
681 | response = buffer_get_string(m, NULL); | |
aa586f8e | 682 | authok = options.challenge_response_authentication && |
683 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 684 | authctxt->as = NULL; |
1588c277 | 685 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 686 | xfree(response); |
687 | ||
688 | buffer_clear(m); | |
689 | buffer_put_int(m, authok); | |
690 | ||
1588c277 | 691 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 692 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
693 | ||
694 | auth_method = "bsdauth"; | |
695 | ||
696 | return (authok != 0); | |
697 | } | |
698 | #endif | |
699 | ||
700 | #ifdef SKEY | |
701 | int | |
702 | mm_answer_skeyquery(int socket, Buffer *m) | |
703 | { | |
704 | struct skey skey; | |
705 | char challenge[1024]; | |
6d6c25e3 | 706 | u_int success; |
1853d1ef | 707 | |
6d6c25e3 | 708 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 709 | |
710 | buffer_clear(m); | |
6d6c25e3 | 711 | buffer_put_int(m, success); |
712 | if (success) | |
1853d1ef | 713 | buffer_put_cstring(m, challenge); |
714 | ||
6d6c25e3 | 715 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 716 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
717 | ||
718 | return (0); | |
719 | } | |
720 | ||
721 | int | |
722 | mm_answer_skeyrespond(int socket, Buffer *m) | |
723 | { | |
724 | char *response; | |
725 | int authok; | |
726 | ||
727 | response = buffer_get_string(m, NULL); | |
728 | ||
aa586f8e | 729 | authok = (options.challenge_response_authentication && |
730 | authctxt->valid && | |
1853d1ef | 731 | skey_haskey(authctxt->pw->pw_name) == 0 && |
732 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
733 | ||
734 | xfree(response); | |
735 | ||
736 | buffer_clear(m); | |
737 | buffer_put_int(m, authok); | |
738 | ||
1588c277 | 739 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 740 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
741 | ||
742 | auth_method = "skey"; | |
743 | ||
744 | return (authok != 0); | |
745 | } | |
746 | #endif | |
747 | ||
ad200abb | 748 | #ifdef USE_PAM |
749 | int | |
750 | mm_answer_pam_start(int socket, Buffer *m) | |
751 | { | |
752 | char *user; | |
753 | ||
7fceb20d | 754 | if (!options.use_pam) |
755 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
756 | ||
ad200abb | 757 | user = buffer_get_string(m, NULL); |
758 | ||
759 | start_pam(user); | |
760 | ||
761 | xfree(user); | |
762 | ||
763 | return (0); | |
764 | } | |
05114c74 | 765 | |
766 | static void *sshpam_ctxt, *sshpam_authok; | |
767 | extern KbdintDevice sshpam_device; | |
768 | ||
769 | int | |
770 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
771 | { | |
772 | ||
773 | debug3("%s", __func__); | |
774 | authctxt->user = buffer_get_string(m, NULL); | |
775 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
776 | sshpam_authok = NULL; | |
777 | buffer_clear(m); | |
778 | if (sshpam_ctxt != NULL) { | |
779 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
780 | buffer_put_int(m, 1); | |
781 | } else { | |
782 | buffer_put_int(m, 0); | |
783 | } | |
784 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
785 | return (0); | |
786 | } | |
787 | ||
788 | int | |
789 | mm_answer_pam_query(int socket, Buffer *m) | |
790 | { | |
791 | char *name, *info, **prompts; | |
792 | u_int num, *echo_on; | |
793 | int i, ret; | |
794 | ||
795 | debug3("%s", __func__); | |
796 | sshpam_authok = NULL; | |
797 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
798 | if (ret == 0 && num == 0) | |
799 | sshpam_authok = sshpam_ctxt; | |
800 | if (num > 1 || name == NULL || info == NULL) | |
801 | ret = -1; | |
802 | buffer_clear(m); | |
803 | buffer_put_int(m, ret); | |
804 | buffer_put_cstring(m, name); | |
805 | xfree(name); | |
806 | buffer_put_cstring(m, info); | |
807 | xfree(info); | |
808 | buffer_put_int(m, num); | |
809 | for (i = 0; i < num; ++i) { | |
810 | buffer_put_cstring(m, prompts[i]); | |
811 | xfree(prompts[i]); | |
812 | buffer_put_int(m, echo_on[i]); | |
813 | } | |
814 | if (prompts != NULL) | |
815 | xfree(prompts); | |
816 | if (echo_on != NULL) | |
817 | xfree(echo_on); | |
818 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
819 | return (0); | |
820 | } | |
821 | ||
822 | int | |
823 | mm_answer_pam_respond(int socket, Buffer *m) | |
824 | { | |
825 | char **resp; | |
826 | u_int num; | |
827 | int i, ret; | |
828 | ||
829 | debug3("%s", __func__); | |
830 | sshpam_authok = NULL; | |
831 | num = buffer_get_int(m); | |
832 | if (num > 0) { | |
833 | resp = xmalloc(num * sizeof(char *)); | |
834 | for (i = 0; i < num; ++i) | |
835 | resp[i] = buffer_get_string(m, NULL); | |
836 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
837 | for (i = 0; i < num; ++i) | |
838 | xfree(resp[i]); | |
839 | xfree(resp); | |
840 | } else { | |
841 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
842 | } | |
843 | buffer_clear(m); | |
844 | buffer_put_int(m, ret); | |
845 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
846 | auth_method = "keyboard-interactive/pam"; | |
847 | if (ret == 0) | |
848 | sshpam_authok = sshpam_ctxt; | |
849 | return (0); | |
850 | } | |
851 | ||
852 | int | |
853 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
854 | { | |
855 | ||
856 | debug3("%s", __func__); | |
857 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
858 | buffer_clear(m); | |
859 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
860 | return (sshpam_authok == sshpam_ctxt); | |
861 | } | |
ad200abb | 862 | #endif |
863 | ||
1853d1ef | 864 | static void |
865 | mm_append_debug(Buffer *m) | |
866 | { | |
867 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 868 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 869 | buffer_append(m, buffer_ptr(&auth_debug), |
870 | buffer_len(&auth_debug)); | |
871 | buffer_clear(&auth_debug); | |
872 | } | |
873 | } | |
874 | ||
875 | int | |
876 | mm_answer_keyallowed(int socket, Buffer *m) | |
877 | { | |
878 | Key *key; | |
661e45a0 | 879 | char *cuser, *chost; |
880 | u_char *blob; | |
1853d1ef | 881 | u_int bloblen; |
882 | enum mm_keytype type = 0; | |
883 | int allowed = 0; | |
884 | ||
1588c277 | 885 | debug3("%s entering", __func__); |
1853d1ef | 886 | |
887 | type = buffer_get_int(m); | |
888 | cuser = buffer_get_string(m, NULL); | |
889 | chost = buffer_get_string(m, NULL); | |
890 | blob = buffer_get_string(m, &bloblen); | |
891 | ||
892 | key = key_from_blob(blob, bloblen); | |
893 | ||
894 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
895 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 896 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 897 | |
1588c277 | 898 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 899 | |
900 | if (key != NULL && authctxt->pw != NULL) { | |
901 | switch(type) { | |
902 | case MM_USERKEY: | |
aa586f8e | 903 | allowed = options.pubkey_authentication && |
904 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 905 | break; |
906 | case MM_HOSTKEY: | |
aa586f8e | 907 | allowed = options.hostbased_authentication && |
908 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 909 | cuser, chost, key); |
910 | break; | |
911 | case MM_RSAHOSTKEY: | |
912 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 913 | allowed = options.rhosts_rsa_authentication && |
914 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 915 | cuser, chost, key); |
916 | break; | |
917 | default: | |
1588c277 | 918 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 919 | break; |
920 | } | |
1853d1ef | 921 | } |
3e2f2431 | 922 | if (key != NULL) |
923 | key_free(key); | |
1853d1ef | 924 | |
925 | /* clear temporarily storage (used by verify) */ | |
926 | monitor_reset_key_state(); | |
927 | ||
928 | if (allowed) { | |
929 | /* Save temporarily for comparison in verify */ | |
930 | key_blob = blob; | |
931 | key_bloblen = bloblen; | |
932 | key_blobtype = type; | |
933 | hostbased_cuser = cuser; | |
934 | hostbased_chost = chost; | |
935 | } | |
936 | ||
937 | debug3("%s: key %p is %s", | |
1588c277 | 938 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 939 | |
940 | buffer_clear(m); | |
941 | buffer_put_int(m, allowed); | |
92e15201 | 942 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 943 | |
944 | mm_append_debug(m); | |
945 | ||
946 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
947 | ||
948 | if (type == MM_RSAHOSTKEY) | |
949 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
950 | ||
951 | return (0); | |
952 | } | |
953 | ||
954 | static int | |
955 | monitor_valid_userblob(u_char *data, u_int datalen) | |
956 | { | |
957 | Buffer b; | |
661e45a0 | 958 | char *p; |
1853d1ef | 959 | u_int len; |
960 | int fail = 0; | |
1853d1ef | 961 | |
962 | buffer_init(&b); | |
963 | buffer_append(&b, data, datalen); | |
964 | ||
965 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 966 | p = buffer_ptr(&b); |
967 | len = buffer_len(&b); | |
968 | if ((session_id2 == NULL) || | |
969 | (len < session_id2_len) || | |
970 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
971 | fail++; | |
1853d1ef | 972 | buffer_consume(&b, session_id2_len); |
973 | } else { | |
521d606b | 974 | p = buffer_get_string(&b, &len); |
975 | if ((session_id2 == NULL) || | |
976 | (len != session_id2_len) || | |
977 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 978 | fail++; |
521d606b | 979 | xfree(p); |
1853d1ef | 980 | } |
981 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
982 | fail++; | |
983 | p = buffer_get_string(&b, NULL); | |
984 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 985 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 986 | authctxt->user, p); |
987 | fail++; | |
988 | } | |
989 | xfree(p); | |
990 | buffer_skip_string(&b); | |
991 | if (datafellows & SSH_BUG_PKAUTH) { | |
992 | if (!buffer_get_char(&b)) | |
993 | fail++; | |
994 | } else { | |
995 | p = buffer_get_string(&b, NULL); | |
996 | if (strcmp("publickey", p) != 0) | |
997 | fail++; | |
998 | xfree(p); | |
999 | if (!buffer_get_char(&b)) | |
1000 | fail++; | |
1001 | buffer_skip_string(&b); | |
1002 | } | |
1003 | buffer_skip_string(&b); | |
1004 | if (buffer_len(&b) != 0) | |
1005 | fail++; | |
1006 | buffer_free(&b); | |
1007 | return (fail == 0); | |
1008 | } | |
1009 | ||
1010 | static int | |
661e45a0 | 1011 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1012 | char *chost) | |
1853d1ef | 1013 | { |
1014 | Buffer b; | |
661e45a0 | 1015 | char *p; |
1853d1ef | 1016 | u_int len; |
1017 | int fail = 0; | |
1853d1ef | 1018 | |
1019 | buffer_init(&b); | |
1020 | buffer_append(&b, data, datalen); | |
1021 | ||
521d606b | 1022 | p = buffer_get_string(&b, &len); |
1023 | if ((session_id2 == NULL) || | |
1024 | (len != session_id2_len) || | |
1025 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1026 | fail++; |
521d606b | 1027 | xfree(p); |
1028 | ||
1853d1ef | 1029 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1030 | fail++; | |
1031 | p = buffer_get_string(&b, NULL); | |
1032 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1033 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1034 | authctxt->user, p); |
1035 | fail++; | |
1036 | } | |
1037 | xfree(p); | |
1038 | buffer_skip_string(&b); /* service */ | |
1039 | p = buffer_get_string(&b, NULL); | |
1040 | if (strcmp(p, "hostbased") != 0) | |
1041 | fail++; | |
1042 | xfree(p); | |
1043 | buffer_skip_string(&b); /* pkalg */ | |
1044 | buffer_skip_string(&b); /* pkblob */ | |
1045 | ||
1046 | /* verify client host, strip trailing dot if necessary */ | |
1047 | p = buffer_get_string(&b, NULL); | |
1048 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1049 | p[len - 1] = '\0'; | |
1050 | if (strcmp(p, chost) != 0) | |
1051 | fail++; | |
1052 | xfree(p); | |
1053 | ||
1054 | /* verify client user */ | |
1055 | p = buffer_get_string(&b, NULL); | |
1056 | if (strcmp(p, cuser) != 0) | |
1057 | fail++; | |
1058 | xfree(p); | |
1059 | ||
1060 | if (buffer_len(&b) != 0) | |
1061 | fail++; | |
1062 | buffer_free(&b); | |
1063 | return (fail == 0); | |
1064 | } | |
1065 | ||
1066 | int | |
1067 | mm_answer_keyverify(int socket, Buffer *m) | |
1068 | { | |
1069 | Key *key; | |
1070 | u_char *signature, *data, *blob; | |
1071 | u_int signaturelen, datalen, bloblen; | |
1072 | int verified = 0; | |
1073 | int valid_data = 0; | |
1074 | ||
1075 | blob = buffer_get_string(m, &bloblen); | |
1076 | signature = buffer_get_string(m, &signaturelen); | |
1077 | data = buffer_get_string(m, &datalen); | |
1078 | ||
1079 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1080 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1081 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1082 | |
1083 | key = key_from_blob(blob, bloblen); | |
1084 | if (key == NULL) | |
1588c277 | 1085 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1086 | |
1087 | switch (key_blobtype) { | |
1088 | case MM_USERKEY: | |
1089 | valid_data = monitor_valid_userblob(data, datalen); | |
1090 | break; | |
1091 | case MM_HOSTKEY: | |
1092 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1093 | hostbased_cuser, hostbased_chost); | |
1094 | break; | |
1095 | default: | |
1096 | valid_data = 0; | |
1097 | break; | |
1098 | } | |
1099 | if (!valid_data) | |
1588c277 | 1100 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1101 | |
1102 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1103 | debug3("%s: key %p signature %s", | |
1588c277 | 1104 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1105 | |
1106 | key_free(key); | |
1107 | xfree(blob); | |
1108 | xfree(signature); | |
1109 | xfree(data); | |
1110 | ||
d17ef027 | 1111 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1112 | ||
1853d1ef | 1113 | monitor_reset_key_state(); |
1114 | ||
1115 | buffer_clear(m); | |
1116 | buffer_put_int(m, verified); | |
1117 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1118 | ||
1853d1ef | 1119 | return (verified); |
1120 | } | |
1121 | ||
1122 | static void | |
1123 | mm_record_login(Session *s, struct passwd *pw) | |
1124 | { | |
1125 | socklen_t fromlen; | |
1126 | struct sockaddr_storage from; | |
1127 | ||
1128 | /* | |
1129 | * Get IP address of client. If the connection is not a socket, let | |
1130 | * the address be 0.0.0.0. | |
1131 | */ | |
1132 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1133 | fromlen = sizeof(from); |
1853d1ef | 1134 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1135 | if (getpeername(packet_get_connection_in(), |
1136 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1137 | debug("getpeername: %.100s", strerror(errno)); | |
1138 | fatal_cleanup(); | |
1139 | } | |
1140 | } | |
1141 | /* Record that there was a login on that tty from the remote host. */ | |
1142 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
1143 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), | |
ba1566dd | 1144 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1145 | } |
1146 | ||
1147 | static void | |
1148 | mm_session_close(Session *s) | |
1149 | { | |
1588c277 | 1150 | debug3("%s: session %d pid %d", __func__, s->self, s->pid); |
1853d1ef | 1151 | if (s->ttyfd != -1) { |
1588c277 | 1152 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1153 | fatal_remove_cleanup(session_pty_cleanup2, (void *)s); |
1154 | session_pty_cleanup2(s); | |
1155 | } | |
1156 | s->used = 0; | |
1157 | } | |
1158 | ||
1159 | int | |
1160 | mm_answer_pty(int socket, Buffer *m) | |
1161 | { | |
b5a28cbc | 1162 | extern struct monitor *pmonitor; |
1853d1ef | 1163 | Session *s; |
1164 | int res, fd0; | |
1165 | ||
1588c277 | 1166 | debug3("%s entering", __func__); |
1853d1ef | 1167 | |
1168 | buffer_clear(m); | |
1169 | s = session_new(); | |
1170 | if (s == NULL) | |
1171 | goto error; | |
1172 | s->authctxt = authctxt; | |
1173 | s->pw = authctxt->pw; | |
b5a28cbc | 1174 | s->pid = pmonitor->m_pid; |
1853d1ef | 1175 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1176 | if (res == 0) | |
1177 | goto error; | |
1178 | fatal_add_cleanup(session_pty_cleanup2, (void *)s); | |
1179 | pty_setowner(authctxt->pw, s->tty); | |
1180 | ||
1181 | buffer_put_int(m, 1); | |
1182 | buffer_put_cstring(m, s->tty); | |
1183 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1184 | ||
1185 | mm_send_fd(socket, s->ptyfd); | |
1186 | mm_send_fd(socket, s->ttyfd); | |
1187 | ||
1188 | /* We need to trick ttyslot */ | |
1189 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1190 | fatal("%s: dup2", __func__); |
1853d1ef | 1191 | |
1192 | mm_record_login(s, authctxt->pw); | |
1193 | ||
1194 | /* Now we can close the file descriptor again */ | |
1195 | close(0); | |
1196 | ||
1197 | /* make sure nothing uses fd 0 */ | |
1198 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1199 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1200 | if (fd0 != 0) |
1588c277 | 1201 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1202 | |
1203 | /* slave is not needed */ | |
1204 | close(s->ttyfd); | |
1205 | s->ttyfd = s->ptyfd; | |
1206 | /* no need to dup() because nobody closes ptyfd */ | |
1207 | s->ptymaster = s->ptyfd; | |
1208 | ||
1588c277 | 1209 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1210 | |
1211 | return (0); | |
1212 | ||
1213 | error: | |
1214 | if (s != NULL) | |
1215 | mm_session_close(s); | |
1216 | buffer_put_int(m, 0); | |
1217 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1218 | return (0); | |
1219 | } | |
1220 | ||
1221 | int | |
1222 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1223 | { | |
1224 | Session *s; | |
1225 | char *tty; | |
1226 | ||
1588c277 | 1227 | debug3("%s entering", __func__); |
1853d1ef | 1228 | |
1229 | tty = buffer_get_string(m, NULL); | |
1230 | if ((s = session_by_tty(tty)) != NULL) | |
1231 | mm_session_close(s); | |
1232 | buffer_clear(m); | |
1233 | xfree(tty); | |
1234 | return (0); | |
1235 | } | |
1236 | ||
1237 | int | |
1238 | mm_answer_sesskey(int socket, Buffer *m) | |
1239 | { | |
1240 | BIGNUM *p; | |
1241 | int rsafail; | |
1242 | ||
1243 | /* Turn off permissions */ | |
1244 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1245 | ||
1246 | if ((p = BN_new()) == NULL) | |
1588c277 | 1247 | fatal("%s: BN_new", __func__); |
1853d1ef | 1248 | |
1249 | buffer_get_bignum2(m, p); | |
1250 | ||
1251 | rsafail = ssh1_session_key(p); | |
1252 | ||
1253 | buffer_clear(m); | |
1254 | buffer_put_int(m, rsafail); | |
1255 | buffer_put_bignum2(m, p); | |
1256 | ||
1257 | BN_clear_free(p); | |
1258 | ||
1259 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1260 | ||
1261 | /* Turn on permissions for sessid passing */ | |
1262 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1263 | ||
1264 | return (0); | |
1265 | } | |
1266 | ||
1267 | int | |
1268 | mm_answer_sessid(int socket, Buffer *m) | |
1269 | { | |
1270 | int i; | |
1271 | ||
1588c277 | 1272 | debug3("%s entering", __func__); |
1853d1ef | 1273 | |
1274 | if (buffer_len(m) != 16) | |
1588c277 | 1275 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1276 | for (i = 0; i < 16; i++) |
1277 | session_id[i] = buffer_get_char(m); | |
1278 | ||
1279 | /* Turn on permissions for getpwnam */ | |
1280 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1281 | ||
1282 | return (0); | |
1283 | } | |
1284 | ||
1285 | int | |
1286 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1287 | { | |
1288 | BIGNUM *client_n; | |
1289 | Key *key = NULL; | |
1290 | u_char *blob = NULL; | |
1291 | u_int blen = 0; | |
1292 | int allowed = 0; | |
1293 | ||
1588c277 | 1294 | debug3("%s entering", __func__); |
1853d1ef | 1295 | |
aa586f8e | 1296 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1297 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1298 | fatal("%s: BN_new", __func__); |
1853d1ef | 1299 | buffer_get_bignum2(m, client_n); |
1300 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1301 | BN_clear_free(client_n); | |
1302 | } | |
1303 | buffer_clear(m); | |
1304 | buffer_put_int(m, allowed); | |
92e15201 | 1305 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1306 | |
1307 | /* clear temporarily storage (used by generate challenge) */ | |
1308 | monitor_reset_key_state(); | |
1309 | ||
1310 | if (allowed && key != NULL) { | |
1311 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1312 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1313 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1314 | buffer_put_string(m, blob, blen); |
1315 | ||
1316 | /* Save temporarily for comparison in verify */ | |
1317 | key_blob = blob; | |
1318 | key_bloblen = blen; | |
1319 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1320 | } |
3e2f2431 | 1321 | if (key != NULL) |
1322 | key_free(key); | |
1853d1ef | 1323 | |
1324 | mm_append_debug(m); | |
1325 | ||
1326 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1327 | ||
1328 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1329 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1330 | return (0); | |
1331 | } | |
1332 | ||
1333 | int | |
1334 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1335 | { | |
1336 | Key *key = NULL; | |
1337 | u_char *blob; | |
1338 | u_int blen; | |
1339 | ||
1588c277 | 1340 | debug3("%s entering", __func__); |
1853d1ef | 1341 | |
1342 | if (!authctxt->valid) | |
1588c277 | 1343 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1344 | blob = buffer_get_string(m, &blen); |
1345 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1346 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1347 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1348 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1349 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1350 | fatal("%s: received bad key", __func__); |
1853d1ef | 1351 | |
1352 | if (ssh1_challenge) | |
1353 | BN_clear_free(ssh1_challenge); | |
1354 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1355 | ||
1356 | buffer_clear(m); | |
1357 | buffer_put_bignum2(m, ssh1_challenge); | |
1358 | ||
1588c277 | 1359 | debug3("%s sending reply", __func__); |
1853d1ef | 1360 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1361 | ||
1362 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1363 | |
1364 | xfree(blob); | |
1365 | key_free(key); | |
1853d1ef | 1366 | return (0); |
1367 | } | |
1368 | ||
1369 | int | |
1370 | mm_answer_rsa_response(int socket, Buffer *m) | |
1371 | { | |
1372 | Key *key = NULL; | |
1373 | u_char *blob, *response; | |
1374 | u_int blen, len; | |
1375 | int success; | |
1376 | ||
1588c277 | 1377 | debug3("%s entering", __func__); |
1853d1ef | 1378 | |
1379 | if (!authctxt->valid) | |
1588c277 | 1380 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1381 | if (ssh1_challenge == NULL) |
1588c277 | 1382 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1383 | |
1384 | blob = buffer_get_string(m, &blen); | |
1385 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1386 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1387 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1388 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1389 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1390 | fatal("%s: received bad key", __func__); |
1853d1ef | 1391 | response = buffer_get_string(m, &len); |
1392 | if (len != 16) | |
1588c277 | 1393 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1394 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1395 | ||
3e2f2431 | 1396 | xfree(blob); |
1853d1ef | 1397 | key_free(key); |
1398 | xfree(response); | |
1399 | ||
1400 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1401 | ||
1402 | /* reset state */ | |
1403 | BN_clear_free(ssh1_challenge); | |
1404 | ssh1_challenge = NULL; | |
1405 | monitor_reset_key_state(); | |
1406 | ||
1407 | buffer_clear(m); | |
1408 | buffer_put_int(m, success); | |
1409 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1410 | ||
1411 | return (success); | |
1412 | } | |
1413 | ||
2db9d8aa | 1414 | #ifdef KRB4 |
1415 | int | |
1416 | mm_answer_krb4(int socket, Buffer *m) | |
1417 | { | |
1418 | KTEXT_ST auth, reply; | |
1419 | char *client, *p; | |
1420 | int success; | |
1421 | u_int alen; | |
1422 | ||
1423 | reply.length = auth.length = 0; | |
1424 | ||
1425 | p = buffer_get_string(m, &alen); | |
1426 | if (alen >= MAX_KTXT_LEN) | |
1427 | fatal("%s: auth too large", __func__); | |
1428 | memcpy(auth.dat, p, alen); | |
1429 | auth.length = alen; | |
1430 | memset(p, 0, alen); | |
1431 | xfree(p); | |
1432 | ||
1433 | success = options.kerberos_authentication && | |
1434 | authctxt->valid && | |
1435 | auth_krb4(authctxt, &auth, &client, &reply); | |
1436 | ||
1437 | memset(auth.dat, 0, alen); | |
1438 | buffer_clear(m); | |
1439 | buffer_put_int(m, success); | |
1440 | ||
1441 | if (success) { | |
1442 | buffer_put_cstring(m, client); | |
1443 | buffer_put_string(m, reply.dat, reply.length); | |
1444 | if (client) | |
1445 | xfree(client); | |
1446 | if (reply.length) | |
1447 | memset(reply.dat, 0, reply.length); | |
1448 | } | |
1449 | ||
1450 | debug3("%s: sending result %d", __func__, success); | |
1451 | mm_request_send(socket, MONITOR_ANS_KRB4, m); | |
1452 | ||
1453 | auth_method = "kerberos"; | |
1454 | ||
1455 | /* Causes monitor loop to terminate if authenticated */ | |
1456 | return (success); | |
1457 | } | |
1458 | #endif | |
696f6bef | 1459 | |
1460 | #ifdef KRB5 | |
1461 | int | |
1462 | mm_answer_krb5(int socket, Buffer *m) | |
1463 | { | |
1464 | krb5_data tkt, reply; | |
1465 | char *client_user; | |
1466 | u_int len; | |
1467 | int success; | |
1468 | ||
1469 | /* use temporary var to avoid size issues on 64bit arch */ | |
1470 | tkt.data = buffer_get_string(m, &len); | |
1471 | tkt.length = len; | |
1472 | ||
4741e3a6 | 1473 | success = options.kerberos_authentication && |
1474 | authctxt->valid && | |
0082ad34 | 1475 | auth_krb5(authctxt, &tkt, &client_user, &reply); |
696f6bef | 1476 | |
1477 | if (tkt.length) | |
1478 | xfree(tkt.data); | |
1479 | ||
1480 | buffer_clear(m); | |
1481 | buffer_put_int(m, success); | |
1482 | ||
1483 | if (success) { | |
1484 | buffer_put_cstring(m, client_user); | |
1485 | buffer_put_string(m, reply.data, reply.length); | |
1486 | if (client_user) | |
1487 | xfree(client_user); | |
1488 | if (reply.length) | |
1489 | xfree(reply.data); | |
1490 | } | |
1491 | mm_request_send(socket, MONITOR_ANS_KRB5, m); | |
1492 | ||
802e01b8 | 1493 | auth_method = "kerberos"; |
1494 | ||
696f6bef | 1495 | return success; |
1496 | } | |
1497 | #endif | |
1498 | ||
1853d1ef | 1499 | int |
1500 | mm_answer_term(int socket, Buffer *req) | |
1501 | { | |
b5a28cbc | 1502 | extern struct monitor *pmonitor; |
1853d1ef | 1503 | int res, status; |
1504 | ||
1588c277 | 1505 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1506 | |
1507 | /* The child is terminating */ | |
1508 | session_destroy_all(&mm_session_close); | |
1509 | ||
b5a28cbc | 1510 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1511 | if (errno != EINTR) |
1512 | exit(1); | |
1853d1ef | 1513 | |
1514 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1515 | ||
1516 | /* Terminate process */ | |
1517 | exit (res); | |
1518 | } | |
1519 | ||
1520 | void | |
b5a28cbc | 1521 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1522 | { |
1523 | if (compat20) { | |
1524 | set_newkeys(MODE_IN); | |
1525 | set_newkeys(MODE_OUT); | |
1526 | } else { | |
1853d1ef | 1527 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1528 | packet_set_encryption_key(child_state.ssh1key, |
1529 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1530 | xfree(child_state.ssh1key); | |
1853d1ef | 1531 | } |
1532 | ||
9459414c | 1533 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1534 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1535 | xfree(child_state.keyout); | |
1536 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1537 | xfree(child_state.keyin); | |
1538 | ||
1539 | if (!compat20) { | |
1540 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1541 | xfree(child_state.ivout); | |
1542 | packet_set_iv(MODE_IN, child_state.ivin); | |
1543 | xfree(child_state.ivin); | |
1544 | } | |
1545 | ||
1546 | memcpy(&incoming_stream, &child_state.incoming, | |
1547 | sizeof(incoming_stream)); | |
1548 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1549 | sizeof(outgoing_stream)); | |
1550 | ||
1551 | /* Update with new address */ | |
0496cf34 | 1552 | if (options.compression) |
1553 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1554 | |
1555 | /* Network I/O buffers */ | |
1556 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1557 | buffer_clear(&input); | |
1558 | buffer_append(&input, child_state.input, child_state.ilen); | |
1559 | memset(child_state.input, 0, child_state.ilen); | |
1560 | xfree(child_state.input); | |
1561 | ||
1562 | buffer_clear(&output); | |
1563 | buffer_append(&output, child_state.output, child_state.olen); | |
1564 | memset(child_state.output, 0, child_state.olen); | |
1565 | xfree(child_state.output); | |
1566 | } | |
1567 | ||
1568 | static Kex * | |
1569 | mm_get_kex(Buffer *m) | |
1570 | { | |
1571 | Kex *kex; | |
1572 | void *blob; | |
1573 | u_int bloblen; | |
1574 | ||
1575 | kex = xmalloc(sizeof(*kex)); | |
1576 | memset(kex, 0, sizeof(*kex)); | |
1577 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1578 | if ((session_id2 == NULL) || |
1579 | (kex->session_id_len != session_id2_len) || | |
1580 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1581 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1582 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1583 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1584 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1585 | kex->server = 1; |
1586 | kex->hostkey_type = buffer_get_int(m); | |
1587 | kex->kex_type = buffer_get_int(m); | |
1588 | blob = buffer_get_string(m, &bloblen); | |
1589 | buffer_init(&kex->my); | |
1590 | buffer_append(&kex->my, blob, bloblen); | |
1591 | xfree(blob); | |
1592 | blob = buffer_get_string(m, &bloblen); | |
1593 | buffer_init(&kex->peer); | |
1594 | buffer_append(&kex->peer, blob, bloblen); | |
1595 | xfree(blob); | |
1596 | kex->done = 1; | |
1597 | kex->flags = buffer_get_int(m); | |
1598 | kex->client_version_string = buffer_get_string(m, NULL); | |
1599 | kex->server_version_string = buffer_get_string(m, NULL); | |
1600 | kex->load_host_key=&get_hostkey_by_type; | |
1601 | kex->host_key_index=&get_hostkey_index; | |
1602 | ||
1603 | return (kex); | |
1604 | } | |
1605 | ||
1606 | /* This function requries careful sanity checking */ | |
1607 | ||
1608 | void | |
b5a28cbc | 1609 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1610 | { |
1611 | Buffer m; | |
1612 | u_char *blob, *p; | |
1613 | u_int bloblen, plen; | |
ffd7b36b | 1614 | u_int32_t seqnr, packets; |
1615 | u_int64_t blocks; | |
1853d1ef | 1616 | |
1588c277 | 1617 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1618 | |
1619 | buffer_init(&m); | |
b5a28cbc | 1620 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1621 | if (!compat20) { |
1622 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1623 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1624 | child_state.ssh1key = buffer_get_string(&m, |
1625 | &child_state.ssh1keylen); | |
1853d1ef | 1626 | child_state.ivout = buffer_get_string(&m, |
1627 | &child_state.ivoutlen); | |
1628 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1629 | goto skip; | |
1630 | } else { | |
1631 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1632 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1633 | } |
1634 | ||
1635 | blob = buffer_get_string(&m, &bloblen); | |
1636 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1637 | xfree(blob); | |
1638 | ||
1588c277 | 1639 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1640 | blob = buffer_get_string(&m, &bloblen); |
1641 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1642 | xfree(blob); | |
1643 | ||
1644 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1645 | seqnr = buffer_get_int(&m); |
1646 | blocks = buffer_get_int64(&m); | |
1647 | packets = buffer_get_int(&m); | |
1648 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1649 | seqnr = buffer_get_int(&m); | |
1650 | blocks = buffer_get_int64(&m); | |
1651 | packets = buffer_get_int(&m); | |
1652 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1653 | |
1654 | skip: | |
1655 | /* Get the key context */ | |
1656 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1657 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1658 | ||
1588c277 | 1659 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1660 | /* Get compression state */ |
1661 | p = buffer_get_string(&m, &plen); | |
1662 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1663 | fatal("%s: bad request size", __func__); |
1853d1ef | 1664 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1665 | xfree(p); | |
1666 | ||
1667 | p = buffer_get_string(&m, &plen); | |
1668 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1669 | fatal("%s: bad request size", __func__); |
1853d1ef | 1670 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1671 | xfree(p); | |
1672 | ||
1673 | /* Network I/O buffers */ | |
1588c277 | 1674 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1675 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1676 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1677 | ||
1678 | buffer_free(&m); | |
1679 | } | |
1680 | ||
1681 | ||
1682 | /* Allocation functions for zlib */ | |
1683 | void * | |
1684 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1685 | { | |
39e71188 | 1686 | size_t len = (size_t) size * ncount; |
1853d1ef | 1687 | void *address; |
1688 | ||
b85698ab | 1689 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1690 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1691 | ||
1692 | address = mm_malloc(mm, len); | |
1853d1ef | 1693 | |
1694 | return (address); | |
1695 | } | |
1696 | ||
1697 | void | |
1698 | mm_zfree(struct mm_master *mm, void *address) | |
1699 | { | |
1700 | mm_free(mm, address); | |
1701 | } | |
1702 | ||
1703 | void | |
1704 | mm_init_compression(struct mm_master *mm) | |
1705 | { | |
1706 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1707 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1708 | outgoing_stream.opaque = mm; | |
1709 | ||
1710 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1711 | incoming_stream.zfree = (free_func)mm_zfree; | |
1712 | incoming_stream.opaque = mm; | |
1713 | } | |
1714 | ||
1715 | /* XXX */ | |
1716 | ||
1717 | #define FD_CLOSEONEXEC(x) do { \ | |
1718 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1719 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1720 | } while (0) | |
1721 | ||
1722 | static void | |
1723 | monitor_socketpair(int *pair) | |
1724 | { | |
f1af2dbf | 1725 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1726 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1727 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1728 | #else |
1729 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1730 | __func__); |
f1af2dbf | 1731 | #endif |
1853d1ef | 1732 | FD_CLOSEONEXEC(pair[0]); |
1733 | FD_CLOSEONEXEC(pair[1]); | |
1734 | } | |
1735 | ||
1736 | #define MM_MEMSIZE 65536 | |
1737 | ||
1738 | struct monitor * | |
1739 | monitor_init(void) | |
1740 | { | |
1741 | struct monitor *mon; | |
1742 | int pair[2]; | |
1743 | ||
1744 | mon = xmalloc(sizeof(*mon)); | |
1745 | ||
1746 | monitor_socketpair(pair); | |
1747 | ||
1748 | mon->m_recvfd = pair[0]; | |
1749 | mon->m_sendfd = pair[1]; | |
1750 | ||
1751 | /* Used to share zlib space across processes */ | |
0496cf34 | 1752 | if (options.compression) { |
1753 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1754 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1755 | |
0496cf34 | 1756 | /* Compression needs to share state across borders */ |
1757 | mm_init_compression(mon->m_zlib); | |
1758 | } | |
1853d1ef | 1759 | |
1760 | return mon; | |
1761 | } | |
1762 | ||
1763 | void | |
1764 | monitor_reinit(struct monitor *mon) | |
1765 | { | |
1766 | int pair[2]; | |
1767 | ||
1768 | monitor_socketpair(pair); | |
1769 | ||
1770 | mon->m_recvfd = pair[0]; | |
1771 | mon->m_sendfd = pair[1]; | |
1772 | } |