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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 |
570 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
571 | #endif | |
1853d1ef | 572 | |
573 | return (0); | |
574 | } | |
575 | ||
94a73cdc | 576 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
577 | { | |
578 | char *banner; | |
579 | ||
580 | buffer_clear(m); | |
581 | banner = auth2_read_banner(); | |
582 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
583 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
584 | ||
585 | if (banner != NULL) | |
30e37ee6 | 586 | xfree(banner); |
94a73cdc | 587 | |
588 | return (0); | |
589 | } | |
590 | ||
1853d1ef | 591 | int |
592 | mm_answer_authserv(int socket, Buffer *m) | |
593 | { | |
594 | monitor_permit_authentications(1); | |
595 | ||
596 | authctxt->service = buffer_get_string(m, NULL); | |
597 | authctxt->style = buffer_get_string(m, NULL); | |
598 | debug3("%s: service=%s, style=%s", | |
1588c277 | 599 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 600 | |
601 | if (strlen(authctxt->style) == 0) { | |
602 | xfree(authctxt->style); | |
603 | authctxt->style = NULL; | |
604 | } | |
605 | ||
606 | return (0); | |
607 | } | |
608 | ||
609 | int | |
610 | mm_answer_authpassword(int socket, Buffer *m) | |
611 | { | |
612 | static int call_count; | |
613 | char *passwd; | |
d341742a | 614 | int authenticated; |
615 | u_int plen; | |
1853d1ef | 616 | |
617 | passwd = buffer_get_string(m, &plen); | |
618 | /* Only authenticate if the context is valid */ | |
aa586f8e | 619 | authenticated = options.password_authentication && |
68ece370 | 620 | auth_password(authctxt, passwd) && authctxt->valid; |
1853d1ef | 621 | memset(passwd, 0, strlen(passwd)); |
622 | xfree(passwd); | |
623 | ||
624 | buffer_clear(m); | |
625 | buffer_put_int(m, authenticated); | |
626 | ||
1588c277 | 627 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 628 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
629 | ||
630 | call_count++; | |
631 | if (plen == 0 && call_count == 1) | |
632 | auth_method = "none"; | |
633 | else | |
634 | auth_method = "password"; | |
635 | ||
636 | /* Causes monitor loop to terminate if authenticated */ | |
637 | return (authenticated); | |
638 | } | |
639 | ||
640 | #ifdef BSD_AUTH | |
641 | int | |
642 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
643 | { | |
644 | char *name, *infotxt; | |
645 | u_int numprompts; | |
646 | u_int *echo_on; | |
647 | char **prompts; | |
6d6c25e3 | 648 | u_int success; |
1853d1ef | 649 | |
6d6c25e3 | 650 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
651 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 652 | |
653 | buffer_clear(m); | |
6d6c25e3 | 654 | buffer_put_int(m, success); |
655 | if (success) | |
1853d1ef | 656 | buffer_put_cstring(m, prompts[0]); |
657 | ||
6d6c25e3 | 658 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 659 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
660 | ||
6d6c25e3 | 661 | if (success) { |
1853d1ef | 662 | xfree(name); |
663 | xfree(infotxt); | |
664 | xfree(prompts); | |
665 | xfree(echo_on); | |
666 | } | |
667 | ||
668 | return (0); | |
669 | } | |
670 | ||
671 | int | |
672 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
673 | { | |
674 | char *response; | |
675 | int authok; | |
676 | ||
677 | if (authctxt->as == 0) | |
1588c277 | 678 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 679 | |
680 | response = buffer_get_string(m, NULL); | |
aa586f8e | 681 | authok = options.challenge_response_authentication && |
682 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 683 | authctxt->as = NULL; |
1588c277 | 684 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 685 | xfree(response); |
686 | ||
687 | buffer_clear(m); | |
688 | buffer_put_int(m, authok); | |
689 | ||
1588c277 | 690 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 691 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
692 | ||
693 | auth_method = "bsdauth"; | |
694 | ||
695 | return (authok != 0); | |
696 | } | |
697 | #endif | |
698 | ||
699 | #ifdef SKEY | |
700 | int | |
701 | mm_answer_skeyquery(int socket, Buffer *m) | |
702 | { | |
703 | struct skey skey; | |
704 | char challenge[1024]; | |
6d6c25e3 | 705 | u_int success; |
1853d1ef | 706 | |
6d6c25e3 | 707 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 708 | |
709 | buffer_clear(m); | |
6d6c25e3 | 710 | buffer_put_int(m, success); |
711 | if (success) | |
1853d1ef | 712 | buffer_put_cstring(m, challenge); |
713 | ||
6d6c25e3 | 714 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 715 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
716 | ||
717 | return (0); | |
718 | } | |
719 | ||
720 | int | |
721 | mm_answer_skeyrespond(int socket, Buffer *m) | |
722 | { | |
723 | char *response; | |
724 | int authok; | |
725 | ||
726 | response = buffer_get_string(m, NULL); | |
727 | ||
aa586f8e | 728 | authok = (options.challenge_response_authentication && |
729 | authctxt->valid && | |
1853d1ef | 730 | skey_haskey(authctxt->pw->pw_name) == 0 && |
731 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
732 | ||
733 | xfree(response); | |
734 | ||
735 | buffer_clear(m); | |
736 | buffer_put_int(m, authok); | |
737 | ||
1588c277 | 738 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 739 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
740 | ||
741 | auth_method = "skey"; | |
742 | ||
743 | return (authok != 0); | |
744 | } | |
745 | #endif | |
746 | ||
ad200abb | 747 | #ifdef USE_PAM |
748 | int | |
749 | mm_answer_pam_start(int socket, Buffer *m) | |
750 | { | |
751 | char *user; | |
752 | ||
753 | user = buffer_get_string(m, NULL); | |
754 | ||
755 | start_pam(user); | |
756 | ||
757 | xfree(user); | |
758 | ||
759 | return (0); | |
760 | } | |
05114c74 | 761 | |
762 | static void *sshpam_ctxt, *sshpam_authok; | |
763 | extern KbdintDevice sshpam_device; | |
764 | ||
765 | int | |
766 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
767 | { | |
768 | ||
769 | debug3("%s", __func__); | |
770 | authctxt->user = buffer_get_string(m, NULL); | |
771 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
772 | sshpam_authok = NULL; | |
773 | buffer_clear(m); | |
774 | if (sshpam_ctxt != NULL) { | |
775 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
776 | buffer_put_int(m, 1); | |
777 | } else { | |
778 | buffer_put_int(m, 0); | |
779 | } | |
780 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
781 | return (0); | |
782 | } | |
783 | ||
784 | int | |
785 | mm_answer_pam_query(int socket, Buffer *m) | |
786 | { | |
787 | char *name, *info, **prompts; | |
788 | u_int num, *echo_on; | |
789 | int i, ret; | |
790 | ||
791 | debug3("%s", __func__); | |
792 | sshpam_authok = NULL; | |
793 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
794 | if (ret == 0 && num == 0) | |
795 | sshpam_authok = sshpam_ctxt; | |
796 | if (num > 1 || name == NULL || info == NULL) | |
797 | ret = -1; | |
798 | buffer_clear(m); | |
799 | buffer_put_int(m, ret); | |
800 | buffer_put_cstring(m, name); | |
801 | xfree(name); | |
802 | buffer_put_cstring(m, info); | |
803 | xfree(info); | |
804 | buffer_put_int(m, num); | |
805 | for (i = 0; i < num; ++i) { | |
806 | buffer_put_cstring(m, prompts[i]); | |
807 | xfree(prompts[i]); | |
808 | buffer_put_int(m, echo_on[i]); | |
809 | } | |
810 | if (prompts != NULL) | |
811 | xfree(prompts); | |
812 | if (echo_on != NULL) | |
813 | xfree(echo_on); | |
814 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
815 | return (0); | |
816 | } | |
817 | ||
818 | int | |
819 | mm_answer_pam_respond(int socket, Buffer *m) | |
820 | { | |
821 | char **resp; | |
822 | u_int num; | |
823 | int i, ret; | |
824 | ||
825 | debug3("%s", __func__); | |
826 | sshpam_authok = NULL; | |
827 | num = buffer_get_int(m); | |
828 | if (num > 0) { | |
829 | resp = xmalloc(num * sizeof(char *)); | |
830 | for (i = 0; i < num; ++i) | |
831 | resp[i] = buffer_get_string(m, NULL); | |
832 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
833 | for (i = 0; i < num; ++i) | |
834 | xfree(resp[i]); | |
835 | xfree(resp); | |
836 | } else { | |
837 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
838 | } | |
839 | buffer_clear(m); | |
840 | buffer_put_int(m, ret); | |
841 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
842 | auth_method = "keyboard-interactive/pam"; | |
843 | if (ret == 0) | |
844 | sshpam_authok = sshpam_ctxt; | |
845 | return (0); | |
846 | } | |
847 | ||
848 | int | |
849 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
850 | { | |
851 | ||
852 | debug3("%s", __func__); | |
853 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
854 | buffer_clear(m); | |
855 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
856 | return (sshpam_authok == sshpam_ctxt); | |
857 | } | |
ad200abb | 858 | #endif |
859 | ||
1853d1ef | 860 | static void |
861 | mm_append_debug(Buffer *m) | |
862 | { | |
863 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 864 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 865 | buffer_append(m, buffer_ptr(&auth_debug), |
866 | buffer_len(&auth_debug)); | |
867 | buffer_clear(&auth_debug); | |
868 | } | |
869 | } | |
870 | ||
871 | int | |
872 | mm_answer_keyallowed(int socket, Buffer *m) | |
873 | { | |
874 | Key *key; | |
661e45a0 | 875 | char *cuser, *chost; |
876 | u_char *blob; | |
1853d1ef | 877 | u_int bloblen; |
878 | enum mm_keytype type = 0; | |
879 | int allowed = 0; | |
880 | ||
1588c277 | 881 | debug3("%s entering", __func__); |
1853d1ef | 882 | |
883 | type = buffer_get_int(m); | |
884 | cuser = buffer_get_string(m, NULL); | |
885 | chost = buffer_get_string(m, NULL); | |
886 | blob = buffer_get_string(m, &bloblen); | |
887 | ||
888 | key = key_from_blob(blob, bloblen); | |
889 | ||
890 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
891 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 892 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 893 | |
1588c277 | 894 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 895 | |
896 | if (key != NULL && authctxt->pw != NULL) { | |
897 | switch(type) { | |
898 | case MM_USERKEY: | |
aa586f8e | 899 | allowed = options.pubkey_authentication && |
900 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 901 | break; |
902 | case MM_HOSTKEY: | |
aa586f8e | 903 | allowed = options.hostbased_authentication && |
904 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 905 | cuser, chost, key); |
906 | break; | |
907 | case MM_RSAHOSTKEY: | |
908 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 909 | allowed = options.rhosts_rsa_authentication && |
910 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 911 | cuser, chost, key); |
912 | break; | |
913 | default: | |
1588c277 | 914 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 915 | break; |
916 | } | |
1853d1ef | 917 | } |
3e2f2431 | 918 | if (key != NULL) |
919 | key_free(key); | |
1853d1ef | 920 | |
921 | /* clear temporarily storage (used by verify) */ | |
922 | monitor_reset_key_state(); | |
923 | ||
924 | if (allowed) { | |
925 | /* Save temporarily for comparison in verify */ | |
926 | key_blob = blob; | |
927 | key_bloblen = bloblen; | |
928 | key_blobtype = type; | |
929 | hostbased_cuser = cuser; | |
930 | hostbased_chost = chost; | |
931 | } | |
932 | ||
933 | debug3("%s: key %p is %s", | |
1588c277 | 934 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 935 | |
936 | buffer_clear(m); | |
937 | buffer_put_int(m, allowed); | |
92e15201 | 938 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 939 | |
940 | mm_append_debug(m); | |
941 | ||
942 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
943 | ||
944 | if (type == MM_RSAHOSTKEY) | |
945 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
946 | ||
947 | return (0); | |
948 | } | |
949 | ||
950 | static int | |
951 | monitor_valid_userblob(u_char *data, u_int datalen) | |
952 | { | |
953 | Buffer b; | |
661e45a0 | 954 | char *p; |
1853d1ef | 955 | u_int len; |
956 | int fail = 0; | |
1853d1ef | 957 | |
958 | buffer_init(&b); | |
959 | buffer_append(&b, data, datalen); | |
960 | ||
961 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 962 | p = buffer_ptr(&b); |
963 | len = buffer_len(&b); | |
964 | if ((session_id2 == NULL) || | |
965 | (len < session_id2_len) || | |
966 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
967 | fail++; | |
1853d1ef | 968 | buffer_consume(&b, session_id2_len); |
969 | } else { | |
521d606b | 970 | p = buffer_get_string(&b, &len); |
971 | if ((session_id2 == NULL) || | |
972 | (len != session_id2_len) || | |
973 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 974 | fail++; |
521d606b | 975 | xfree(p); |
1853d1ef | 976 | } |
977 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
978 | fail++; | |
979 | p = buffer_get_string(&b, NULL); | |
980 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 981 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 982 | authctxt->user, p); |
983 | fail++; | |
984 | } | |
985 | xfree(p); | |
986 | buffer_skip_string(&b); | |
987 | if (datafellows & SSH_BUG_PKAUTH) { | |
988 | if (!buffer_get_char(&b)) | |
989 | fail++; | |
990 | } else { | |
991 | p = buffer_get_string(&b, NULL); | |
992 | if (strcmp("publickey", p) != 0) | |
993 | fail++; | |
994 | xfree(p); | |
995 | if (!buffer_get_char(&b)) | |
996 | fail++; | |
997 | buffer_skip_string(&b); | |
998 | } | |
999 | buffer_skip_string(&b); | |
1000 | if (buffer_len(&b) != 0) | |
1001 | fail++; | |
1002 | buffer_free(&b); | |
1003 | return (fail == 0); | |
1004 | } | |
1005 | ||
1006 | static int | |
661e45a0 | 1007 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1008 | char *chost) | |
1853d1ef | 1009 | { |
1010 | Buffer b; | |
661e45a0 | 1011 | char *p; |
1853d1ef | 1012 | u_int len; |
1013 | int fail = 0; | |
1853d1ef | 1014 | |
1015 | buffer_init(&b); | |
1016 | buffer_append(&b, data, datalen); | |
1017 | ||
521d606b | 1018 | p = buffer_get_string(&b, &len); |
1019 | if ((session_id2 == NULL) || | |
1020 | (len != session_id2_len) || | |
1021 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1022 | fail++; |
521d606b | 1023 | xfree(p); |
1024 | ||
1853d1ef | 1025 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1026 | fail++; | |
1027 | p = buffer_get_string(&b, NULL); | |
1028 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1029 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1030 | authctxt->user, p); |
1031 | fail++; | |
1032 | } | |
1033 | xfree(p); | |
1034 | buffer_skip_string(&b); /* service */ | |
1035 | p = buffer_get_string(&b, NULL); | |
1036 | if (strcmp(p, "hostbased") != 0) | |
1037 | fail++; | |
1038 | xfree(p); | |
1039 | buffer_skip_string(&b); /* pkalg */ | |
1040 | buffer_skip_string(&b); /* pkblob */ | |
1041 | ||
1042 | /* verify client host, strip trailing dot if necessary */ | |
1043 | p = buffer_get_string(&b, NULL); | |
1044 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1045 | p[len - 1] = '\0'; | |
1046 | if (strcmp(p, chost) != 0) | |
1047 | fail++; | |
1048 | xfree(p); | |
1049 | ||
1050 | /* verify client user */ | |
1051 | p = buffer_get_string(&b, NULL); | |
1052 | if (strcmp(p, cuser) != 0) | |
1053 | fail++; | |
1054 | xfree(p); | |
1055 | ||
1056 | if (buffer_len(&b) != 0) | |
1057 | fail++; | |
1058 | buffer_free(&b); | |
1059 | return (fail == 0); | |
1060 | } | |
1061 | ||
1062 | int | |
1063 | mm_answer_keyverify(int socket, Buffer *m) | |
1064 | { | |
1065 | Key *key; | |
1066 | u_char *signature, *data, *blob; | |
1067 | u_int signaturelen, datalen, bloblen; | |
1068 | int verified = 0; | |
1069 | int valid_data = 0; | |
1070 | ||
1071 | blob = buffer_get_string(m, &bloblen); | |
1072 | signature = buffer_get_string(m, &signaturelen); | |
1073 | data = buffer_get_string(m, &datalen); | |
1074 | ||
1075 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1076 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1077 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1078 | |
1079 | key = key_from_blob(blob, bloblen); | |
1080 | if (key == NULL) | |
1588c277 | 1081 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1082 | |
1083 | switch (key_blobtype) { | |
1084 | case MM_USERKEY: | |
1085 | valid_data = monitor_valid_userblob(data, datalen); | |
1086 | break; | |
1087 | case MM_HOSTKEY: | |
1088 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1089 | hostbased_cuser, hostbased_chost); | |
1090 | break; | |
1091 | default: | |
1092 | valid_data = 0; | |
1093 | break; | |
1094 | } | |
1095 | if (!valid_data) | |
1588c277 | 1096 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1097 | |
1098 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1099 | debug3("%s: key %p signature %s", | |
1588c277 | 1100 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1101 | |
1102 | key_free(key); | |
1103 | xfree(blob); | |
1104 | xfree(signature); | |
1105 | xfree(data); | |
1106 | ||
d17ef027 | 1107 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1108 | ||
1853d1ef | 1109 | monitor_reset_key_state(); |
1110 | ||
1111 | buffer_clear(m); | |
1112 | buffer_put_int(m, verified); | |
1113 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1114 | ||
1853d1ef | 1115 | return (verified); |
1116 | } | |
1117 | ||
1118 | static void | |
1119 | mm_record_login(Session *s, struct passwd *pw) | |
1120 | { | |
1121 | socklen_t fromlen; | |
1122 | struct sockaddr_storage from; | |
1123 | ||
1124 | /* | |
1125 | * Get IP address of client. If the connection is not a socket, let | |
1126 | * the address be 0.0.0.0. | |
1127 | */ | |
1128 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1129 | fromlen = sizeof(from); |
1853d1ef | 1130 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1131 | if (getpeername(packet_get_connection_in(), |
1132 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1133 | debug("getpeername: %.100s", strerror(errno)); | |
1134 | fatal_cleanup(); | |
1135 | } | |
1136 | } | |
1137 | /* Record that there was a login on that tty from the remote host. */ | |
1138 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
1139 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), | |
ba1566dd | 1140 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1141 | } |
1142 | ||
1143 | static void | |
1144 | mm_session_close(Session *s) | |
1145 | { | |
1588c277 | 1146 | debug3("%s: session %d pid %d", __func__, s->self, s->pid); |
1853d1ef | 1147 | if (s->ttyfd != -1) { |
1588c277 | 1148 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1149 | fatal_remove_cleanup(session_pty_cleanup2, (void *)s); |
1150 | session_pty_cleanup2(s); | |
1151 | } | |
1152 | s->used = 0; | |
1153 | } | |
1154 | ||
1155 | int | |
1156 | mm_answer_pty(int socket, Buffer *m) | |
1157 | { | |
b5a28cbc | 1158 | extern struct monitor *pmonitor; |
1853d1ef | 1159 | Session *s; |
1160 | int res, fd0; | |
1161 | ||
1588c277 | 1162 | debug3("%s entering", __func__); |
1853d1ef | 1163 | |
1164 | buffer_clear(m); | |
1165 | s = session_new(); | |
1166 | if (s == NULL) | |
1167 | goto error; | |
1168 | s->authctxt = authctxt; | |
1169 | s->pw = authctxt->pw; | |
b5a28cbc | 1170 | s->pid = pmonitor->m_pid; |
1853d1ef | 1171 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1172 | if (res == 0) | |
1173 | goto error; | |
1174 | fatal_add_cleanup(session_pty_cleanup2, (void *)s); | |
1175 | pty_setowner(authctxt->pw, s->tty); | |
1176 | ||
1177 | buffer_put_int(m, 1); | |
1178 | buffer_put_cstring(m, s->tty); | |
1179 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1180 | ||
1181 | mm_send_fd(socket, s->ptyfd); | |
1182 | mm_send_fd(socket, s->ttyfd); | |
1183 | ||
1184 | /* We need to trick ttyslot */ | |
1185 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1186 | fatal("%s: dup2", __func__); |
1853d1ef | 1187 | |
1188 | mm_record_login(s, authctxt->pw); | |
1189 | ||
1190 | /* Now we can close the file descriptor again */ | |
1191 | close(0); | |
1192 | ||
1193 | /* make sure nothing uses fd 0 */ | |
1194 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1195 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1196 | if (fd0 != 0) |
1588c277 | 1197 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1198 | |
1199 | /* slave is not needed */ | |
1200 | close(s->ttyfd); | |
1201 | s->ttyfd = s->ptyfd; | |
1202 | /* no need to dup() because nobody closes ptyfd */ | |
1203 | s->ptymaster = s->ptyfd; | |
1204 | ||
1588c277 | 1205 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1206 | |
1207 | return (0); | |
1208 | ||
1209 | error: | |
1210 | if (s != NULL) | |
1211 | mm_session_close(s); | |
1212 | buffer_put_int(m, 0); | |
1213 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1214 | return (0); | |
1215 | } | |
1216 | ||
1217 | int | |
1218 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1219 | { | |
1220 | Session *s; | |
1221 | char *tty; | |
1222 | ||
1588c277 | 1223 | debug3("%s entering", __func__); |
1853d1ef | 1224 | |
1225 | tty = buffer_get_string(m, NULL); | |
1226 | if ((s = session_by_tty(tty)) != NULL) | |
1227 | mm_session_close(s); | |
1228 | buffer_clear(m); | |
1229 | xfree(tty); | |
1230 | return (0); | |
1231 | } | |
1232 | ||
1233 | int | |
1234 | mm_answer_sesskey(int socket, Buffer *m) | |
1235 | { | |
1236 | BIGNUM *p; | |
1237 | int rsafail; | |
1238 | ||
1239 | /* Turn off permissions */ | |
1240 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1241 | ||
1242 | if ((p = BN_new()) == NULL) | |
1588c277 | 1243 | fatal("%s: BN_new", __func__); |
1853d1ef | 1244 | |
1245 | buffer_get_bignum2(m, p); | |
1246 | ||
1247 | rsafail = ssh1_session_key(p); | |
1248 | ||
1249 | buffer_clear(m); | |
1250 | buffer_put_int(m, rsafail); | |
1251 | buffer_put_bignum2(m, p); | |
1252 | ||
1253 | BN_clear_free(p); | |
1254 | ||
1255 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1256 | ||
1257 | /* Turn on permissions for sessid passing */ | |
1258 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1259 | ||
1260 | return (0); | |
1261 | } | |
1262 | ||
1263 | int | |
1264 | mm_answer_sessid(int socket, Buffer *m) | |
1265 | { | |
1266 | int i; | |
1267 | ||
1588c277 | 1268 | debug3("%s entering", __func__); |
1853d1ef | 1269 | |
1270 | if (buffer_len(m) != 16) | |
1588c277 | 1271 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1272 | for (i = 0; i < 16; i++) |
1273 | session_id[i] = buffer_get_char(m); | |
1274 | ||
1275 | /* Turn on permissions for getpwnam */ | |
1276 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1277 | ||
1278 | return (0); | |
1279 | } | |
1280 | ||
1281 | int | |
1282 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1283 | { | |
1284 | BIGNUM *client_n; | |
1285 | Key *key = NULL; | |
1286 | u_char *blob = NULL; | |
1287 | u_int blen = 0; | |
1288 | int allowed = 0; | |
1289 | ||
1588c277 | 1290 | debug3("%s entering", __func__); |
1853d1ef | 1291 | |
aa586f8e | 1292 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1293 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1294 | fatal("%s: BN_new", __func__); |
1853d1ef | 1295 | buffer_get_bignum2(m, client_n); |
1296 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1297 | BN_clear_free(client_n); | |
1298 | } | |
1299 | buffer_clear(m); | |
1300 | buffer_put_int(m, allowed); | |
92e15201 | 1301 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1302 | |
1303 | /* clear temporarily storage (used by generate challenge) */ | |
1304 | monitor_reset_key_state(); | |
1305 | ||
1306 | if (allowed && key != NULL) { | |
1307 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1308 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1309 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1310 | buffer_put_string(m, blob, blen); |
1311 | ||
1312 | /* Save temporarily for comparison in verify */ | |
1313 | key_blob = blob; | |
1314 | key_bloblen = blen; | |
1315 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1316 | } |
3e2f2431 | 1317 | if (key != NULL) |
1318 | key_free(key); | |
1853d1ef | 1319 | |
1320 | mm_append_debug(m); | |
1321 | ||
1322 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1323 | ||
1324 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1325 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1326 | return (0); | |
1327 | } | |
1328 | ||
1329 | int | |
1330 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1331 | { | |
1332 | Key *key = NULL; | |
1333 | u_char *blob; | |
1334 | u_int blen; | |
1335 | ||
1588c277 | 1336 | debug3("%s entering", __func__); |
1853d1ef | 1337 | |
1338 | if (!authctxt->valid) | |
1588c277 | 1339 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1340 | blob = buffer_get_string(m, &blen); |
1341 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1342 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1343 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1344 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1345 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1346 | fatal("%s: received bad key", __func__); |
1853d1ef | 1347 | |
1348 | if (ssh1_challenge) | |
1349 | BN_clear_free(ssh1_challenge); | |
1350 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1351 | ||
1352 | buffer_clear(m); | |
1353 | buffer_put_bignum2(m, ssh1_challenge); | |
1354 | ||
1588c277 | 1355 | debug3("%s sending reply", __func__); |
1853d1ef | 1356 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1357 | ||
1358 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1359 | |
1360 | xfree(blob); | |
1361 | key_free(key); | |
1853d1ef | 1362 | return (0); |
1363 | } | |
1364 | ||
1365 | int | |
1366 | mm_answer_rsa_response(int socket, Buffer *m) | |
1367 | { | |
1368 | Key *key = NULL; | |
1369 | u_char *blob, *response; | |
1370 | u_int blen, len; | |
1371 | int success; | |
1372 | ||
1588c277 | 1373 | debug3("%s entering", __func__); |
1853d1ef | 1374 | |
1375 | if (!authctxt->valid) | |
1588c277 | 1376 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1377 | if (ssh1_challenge == NULL) |
1588c277 | 1378 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1379 | |
1380 | blob = buffer_get_string(m, &blen); | |
1381 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1382 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1383 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1384 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1385 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1386 | fatal("%s: received bad key", __func__); |
1853d1ef | 1387 | response = buffer_get_string(m, &len); |
1388 | if (len != 16) | |
1588c277 | 1389 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1390 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1391 | ||
3e2f2431 | 1392 | xfree(blob); |
1853d1ef | 1393 | key_free(key); |
1394 | xfree(response); | |
1395 | ||
1396 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1397 | ||
1398 | /* reset state */ | |
1399 | BN_clear_free(ssh1_challenge); | |
1400 | ssh1_challenge = NULL; | |
1401 | monitor_reset_key_state(); | |
1402 | ||
1403 | buffer_clear(m); | |
1404 | buffer_put_int(m, success); | |
1405 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1406 | ||
1407 | return (success); | |
1408 | } | |
1409 | ||
2db9d8aa | 1410 | #ifdef KRB4 |
1411 | int | |
1412 | mm_answer_krb4(int socket, Buffer *m) | |
1413 | { | |
1414 | KTEXT_ST auth, reply; | |
1415 | char *client, *p; | |
1416 | int success; | |
1417 | u_int alen; | |
1418 | ||
1419 | reply.length = auth.length = 0; | |
1420 | ||
1421 | p = buffer_get_string(m, &alen); | |
1422 | if (alen >= MAX_KTXT_LEN) | |
1423 | fatal("%s: auth too large", __func__); | |
1424 | memcpy(auth.dat, p, alen); | |
1425 | auth.length = alen; | |
1426 | memset(p, 0, alen); | |
1427 | xfree(p); | |
1428 | ||
1429 | success = options.kerberos_authentication && | |
1430 | authctxt->valid && | |
1431 | auth_krb4(authctxt, &auth, &client, &reply); | |
1432 | ||
1433 | memset(auth.dat, 0, alen); | |
1434 | buffer_clear(m); | |
1435 | buffer_put_int(m, success); | |
1436 | ||
1437 | if (success) { | |
1438 | buffer_put_cstring(m, client); | |
1439 | buffer_put_string(m, reply.dat, reply.length); | |
1440 | if (client) | |
1441 | xfree(client); | |
1442 | if (reply.length) | |
1443 | memset(reply.dat, 0, reply.length); | |
1444 | } | |
1445 | ||
1446 | debug3("%s: sending result %d", __func__, success); | |
1447 | mm_request_send(socket, MONITOR_ANS_KRB4, m); | |
1448 | ||
1449 | auth_method = "kerberos"; | |
1450 | ||
1451 | /* Causes monitor loop to terminate if authenticated */ | |
1452 | return (success); | |
1453 | } | |
1454 | #endif | |
696f6bef | 1455 | |
1456 | #ifdef KRB5 | |
1457 | int | |
1458 | mm_answer_krb5(int socket, Buffer *m) | |
1459 | { | |
1460 | krb5_data tkt, reply; | |
1461 | char *client_user; | |
1462 | u_int len; | |
1463 | int success; | |
1464 | ||
1465 | /* use temporary var to avoid size issues on 64bit arch */ | |
1466 | tkt.data = buffer_get_string(m, &len); | |
1467 | tkt.length = len; | |
1468 | ||
4741e3a6 | 1469 | success = options.kerberos_authentication && |
1470 | authctxt->valid && | |
0082ad34 | 1471 | auth_krb5(authctxt, &tkt, &client_user, &reply); |
696f6bef | 1472 | |
1473 | if (tkt.length) | |
1474 | xfree(tkt.data); | |
1475 | ||
1476 | buffer_clear(m); | |
1477 | buffer_put_int(m, success); | |
1478 | ||
1479 | if (success) { | |
1480 | buffer_put_cstring(m, client_user); | |
1481 | buffer_put_string(m, reply.data, reply.length); | |
1482 | if (client_user) | |
1483 | xfree(client_user); | |
1484 | if (reply.length) | |
1485 | xfree(reply.data); | |
1486 | } | |
1487 | mm_request_send(socket, MONITOR_ANS_KRB5, m); | |
1488 | ||
802e01b8 | 1489 | auth_method = "kerberos"; |
1490 | ||
696f6bef | 1491 | return success; |
1492 | } | |
1493 | #endif | |
1494 | ||
1853d1ef | 1495 | int |
1496 | mm_answer_term(int socket, Buffer *req) | |
1497 | { | |
b5a28cbc | 1498 | extern struct monitor *pmonitor; |
1853d1ef | 1499 | int res, status; |
1500 | ||
1588c277 | 1501 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1502 | |
1503 | /* The child is terminating */ | |
1504 | session_destroy_all(&mm_session_close); | |
1505 | ||
b5a28cbc | 1506 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1507 | if (errno != EINTR) |
1508 | exit(1); | |
1853d1ef | 1509 | |
1510 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1511 | ||
1512 | /* Terminate process */ | |
1513 | exit (res); | |
1514 | } | |
1515 | ||
1516 | void | |
b5a28cbc | 1517 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1518 | { |
1519 | if (compat20) { | |
1520 | set_newkeys(MODE_IN); | |
1521 | set_newkeys(MODE_OUT); | |
1522 | } else { | |
1853d1ef | 1523 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1524 | packet_set_encryption_key(child_state.ssh1key, |
1525 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1526 | xfree(child_state.ssh1key); | |
1853d1ef | 1527 | } |
1528 | ||
9459414c | 1529 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1530 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1531 | xfree(child_state.keyout); | |
1532 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1533 | xfree(child_state.keyin); | |
1534 | ||
1535 | if (!compat20) { | |
1536 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1537 | xfree(child_state.ivout); | |
1538 | packet_set_iv(MODE_IN, child_state.ivin); | |
1539 | xfree(child_state.ivin); | |
1540 | } | |
1541 | ||
1542 | memcpy(&incoming_stream, &child_state.incoming, | |
1543 | sizeof(incoming_stream)); | |
1544 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1545 | sizeof(outgoing_stream)); | |
1546 | ||
1547 | /* Update with new address */ | |
0496cf34 | 1548 | if (options.compression) |
1549 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1550 | |
1551 | /* Network I/O buffers */ | |
1552 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1553 | buffer_clear(&input); | |
1554 | buffer_append(&input, child_state.input, child_state.ilen); | |
1555 | memset(child_state.input, 0, child_state.ilen); | |
1556 | xfree(child_state.input); | |
1557 | ||
1558 | buffer_clear(&output); | |
1559 | buffer_append(&output, child_state.output, child_state.olen); | |
1560 | memset(child_state.output, 0, child_state.olen); | |
1561 | xfree(child_state.output); | |
1562 | } | |
1563 | ||
1564 | static Kex * | |
1565 | mm_get_kex(Buffer *m) | |
1566 | { | |
1567 | Kex *kex; | |
1568 | void *blob; | |
1569 | u_int bloblen; | |
1570 | ||
1571 | kex = xmalloc(sizeof(*kex)); | |
1572 | memset(kex, 0, sizeof(*kex)); | |
1573 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1574 | if ((session_id2 == NULL) || |
1575 | (kex->session_id_len != session_id2_len) || | |
1576 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1577 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1578 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1579 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1580 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1581 | kex->server = 1; |
1582 | kex->hostkey_type = buffer_get_int(m); | |
1583 | kex->kex_type = buffer_get_int(m); | |
1584 | blob = buffer_get_string(m, &bloblen); | |
1585 | buffer_init(&kex->my); | |
1586 | buffer_append(&kex->my, blob, bloblen); | |
1587 | xfree(blob); | |
1588 | blob = buffer_get_string(m, &bloblen); | |
1589 | buffer_init(&kex->peer); | |
1590 | buffer_append(&kex->peer, blob, bloblen); | |
1591 | xfree(blob); | |
1592 | kex->done = 1; | |
1593 | kex->flags = buffer_get_int(m); | |
1594 | kex->client_version_string = buffer_get_string(m, NULL); | |
1595 | kex->server_version_string = buffer_get_string(m, NULL); | |
1596 | kex->load_host_key=&get_hostkey_by_type; | |
1597 | kex->host_key_index=&get_hostkey_index; | |
1598 | ||
1599 | return (kex); | |
1600 | } | |
1601 | ||
1602 | /* This function requries careful sanity checking */ | |
1603 | ||
1604 | void | |
b5a28cbc | 1605 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1606 | { |
1607 | Buffer m; | |
1608 | u_char *blob, *p; | |
1609 | u_int bloblen, plen; | |
ffd7b36b | 1610 | u_int32_t seqnr, packets; |
1611 | u_int64_t blocks; | |
1853d1ef | 1612 | |
1588c277 | 1613 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1614 | |
1615 | buffer_init(&m); | |
b5a28cbc | 1616 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1617 | if (!compat20) { |
1618 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1619 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1620 | child_state.ssh1key = buffer_get_string(&m, |
1621 | &child_state.ssh1keylen); | |
1853d1ef | 1622 | child_state.ivout = buffer_get_string(&m, |
1623 | &child_state.ivoutlen); | |
1624 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1625 | goto skip; | |
1626 | } else { | |
1627 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1628 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1629 | } |
1630 | ||
1631 | blob = buffer_get_string(&m, &bloblen); | |
1632 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1633 | xfree(blob); | |
1634 | ||
1588c277 | 1635 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1636 | blob = buffer_get_string(&m, &bloblen); |
1637 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1638 | xfree(blob); | |
1639 | ||
1640 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1641 | seqnr = buffer_get_int(&m); |
1642 | blocks = buffer_get_int64(&m); | |
1643 | packets = buffer_get_int(&m); | |
1644 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1645 | seqnr = buffer_get_int(&m); | |
1646 | blocks = buffer_get_int64(&m); | |
1647 | packets = buffer_get_int(&m); | |
1648 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1649 | |
1650 | skip: | |
1651 | /* Get the key context */ | |
1652 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1653 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1654 | ||
1588c277 | 1655 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1656 | /* Get compression state */ |
1657 | p = buffer_get_string(&m, &plen); | |
1658 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1659 | fatal("%s: bad request size", __func__); |
1853d1ef | 1660 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1661 | xfree(p); | |
1662 | ||
1663 | p = buffer_get_string(&m, &plen); | |
1664 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1665 | fatal("%s: bad request size", __func__); |
1853d1ef | 1666 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1667 | xfree(p); | |
1668 | ||
1669 | /* Network I/O buffers */ | |
1588c277 | 1670 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1671 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1672 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1673 | ||
1674 | buffer_free(&m); | |
1675 | } | |
1676 | ||
1677 | ||
1678 | /* Allocation functions for zlib */ | |
1679 | void * | |
1680 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1681 | { | |
39e71188 | 1682 | size_t len = (size_t) size * ncount; |
1853d1ef | 1683 | void *address; |
1684 | ||
b85698ab | 1685 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1686 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1687 | ||
1688 | address = mm_malloc(mm, len); | |
1853d1ef | 1689 | |
1690 | return (address); | |
1691 | } | |
1692 | ||
1693 | void | |
1694 | mm_zfree(struct mm_master *mm, void *address) | |
1695 | { | |
1696 | mm_free(mm, address); | |
1697 | } | |
1698 | ||
1699 | void | |
1700 | mm_init_compression(struct mm_master *mm) | |
1701 | { | |
1702 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1703 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1704 | outgoing_stream.opaque = mm; | |
1705 | ||
1706 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1707 | incoming_stream.zfree = (free_func)mm_zfree; | |
1708 | incoming_stream.opaque = mm; | |
1709 | } | |
1710 | ||
1711 | /* XXX */ | |
1712 | ||
1713 | #define FD_CLOSEONEXEC(x) do { \ | |
1714 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1715 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1716 | } while (0) | |
1717 | ||
1718 | static void | |
1719 | monitor_socketpair(int *pair) | |
1720 | { | |
f1af2dbf | 1721 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1722 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1723 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1724 | #else |
1725 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1726 | __func__); |
f1af2dbf | 1727 | #endif |
1853d1ef | 1728 | FD_CLOSEONEXEC(pair[0]); |
1729 | FD_CLOSEONEXEC(pair[1]); | |
1730 | } | |
1731 | ||
1732 | #define MM_MEMSIZE 65536 | |
1733 | ||
1734 | struct monitor * | |
1735 | monitor_init(void) | |
1736 | { | |
1737 | struct monitor *mon; | |
1738 | int pair[2]; | |
1739 | ||
1740 | mon = xmalloc(sizeof(*mon)); | |
1741 | ||
1742 | monitor_socketpair(pair); | |
1743 | ||
1744 | mon->m_recvfd = pair[0]; | |
1745 | mon->m_sendfd = pair[1]; | |
1746 | ||
1747 | /* Used to share zlib space across processes */ | |
0496cf34 | 1748 | if (options.compression) { |
1749 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1750 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1751 | |
0496cf34 | 1752 | /* Compression needs to share state across borders */ |
1753 | mm_init_compression(mon->m_zlib); | |
1754 | } | |
1853d1ef | 1755 | |
1756 | return mon; | |
1757 | } | |
1758 | ||
1759 | void | |
1760 | monitor_reinit(struct monitor *mon) | |
1761 | { | |
1762 | int pair[2]; | |
1763 | ||
1764 | monitor_socketpair(pair); | |
1765 | ||
1766 | mon->m_recvfd = pair[0]; | |
1767 | mon->m_sendfd = pair[1]; | |
1768 | } |