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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" | |
ffd7b36b | 28 | RCSID("$OpenBSD: monitor.c,v 1.37 2003/04/02 09:48:07 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}, | |
185 | {0, 0, NULL} | |
186 | }; | |
187 | ||
188 | struct mon_table mon_dispatch_postauth20[] = { | |
189 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
190 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
191 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
192 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
193 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
194 | {0, 0, NULL} | |
195 | }; | |
196 | ||
197 | struct mon_table mon_dispatch_proto15[] = { | |
198 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
199 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
200 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
201 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
202 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
203 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
204 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
205 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
206 | #ifdef BSD_AUTH | |
207 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
208 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
209 | #endif | |
210 | #ifdef SKEY | |
211 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
212 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 213 | #endif |
214 | #ifdef USE_PAM | |
215 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
05114c74 | 216 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
217 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
218 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
219 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
696f6bef | 220 | #endif |
2db9d8aa | 221 | #ifdef KRB4 |
222 | {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4}, | |
223 | #endif | |
696f6bef | 224 | #ifdef KRB5 |
225 | {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5}, | |
1853d1ef | 226 | #endif |
227 | {0, 0, NULL} | |
228 | }; | |
229 | ||
230 | struct mon_table mon_dispatch_postauth15[] = { | |
231 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
232 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
233 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
234 | {0, 0, NULL} | |
235 | }; | |
236 | ||
237 | struct mon_table *mon_dispatch; | |
238 | ||
239 | /* Specifies if a certain message is allowed at the moment */ | |
240 | ||
241 | static void | |
242 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
243 | { | |
244 | while (ent->f != NULL) { | |
245 | if (ent->type == type) { | |
246 | ent->flags &= ~MON_PERMIT; | |
247 | ent->flags |= permit ? MON_PERMIT : 0; | |
248 | return; | |
249 | } | |
250 | ent++; | |
251 | } | |
252 | } | |
253 | ||
254 | static void | |
255 | monitor_permit_authentications(int permit) | |
256 | { | |
257 | struct mon_table *ent = mon_dispatch; | |
258 | ||
259 | while (ent->f != NULL) { | |
260 | if (ent->flags & MON_AUTH) { | |
261 | ent->flags &= ~MON_PERMIT; | |
262 | ent->flags |= permit ? MON_PERMIT : 0; | |
263 | } | |
264 | ent++; | |
265 | } | |
266 | } | |
267 | ||
268 | Authctxt * | |
b5a28cbc | 269 | monitor_child_preauth(struct monitor *pmonitor) |
1853d1ef | 270 | { |
271 | struct mon_table *ent; | |
272 | int authenticated = 0; | |
273 | ||
274 | debug3("preauth child monitor started"); | |
275 | ||
276 | if (compat20) { | |
277 | mon_dispatch = mon_dispatch_proto20; | |
278 | ||
279 | /* Permit requests for moduli and signatures */ | |
280 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
281 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
282 | } else { | |
283 | mon_dispatch = mon_dispatch_proto15; | |
284 | ||
285 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
286 | } | |
287 | ||
288 | authctxt = authctxt_new(); | |
289 | ||
290 | /* The first few requests do not require asynchronous access */ | |
291 | while (!authenticated) { | |
b5a28cbc | 292 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 293 | if (authenticated) { |
294 | if (!(ent->flags & MON_AUTHDECIDE)) | |
295 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 296 | __func__, ent->type); |
1853d1ef | 297 | if (authctxt->pw->pw_uid == 0 && |
298 | !auth_root_allowed(auth_method)) | |
299 | authenticated = 0; | |
300 | } | |
301 | ||
302 | if (ent->flags & MON_AUTHDECIDE) { | |
303 | auth_log(authctxt, authenticated, auth_method, | |
304 | compat20 ? " ssh2" : ""); | |
305 | if (!authenticated) | |
306 | authctxt->failures++; | |
307 | } | |
308 | } | |
309 | ||
310 | if (!authctxt->valid) | |
1588c277 | 311 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 312 | |
313 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 314 | __func__, authctxt->user); |
1853d1ef | 315 | |
b5a28cbc | 316 | mm_get_keystate(pmonitor); |
1853d1ef | 317 | |
318 | return (authctxt); | |
319 | } | |
320 | ||
321 | void | |
b5a28cbc | 322 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 323 | { |
324 | if (compat20) { | |
325 | mon_dispatch = mon_dispatch_postauth20; | |
326 | ||
327 | /* Permit requests for moduli and signatures */ | |
328 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
329 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
330 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
331 | ||
332 | } else { | |
333 | mon_dispatch = mon_dispatch_postauth15; | |
334 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
335 | } | |
336 | if (!no_pty_flag) { | |
337 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
338 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
339 | } | |
340 | ||
341 | for (;;) | |
b5a28cbc | 342 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 343 | } |
344 | ||
345 | void | |
b5a28cbc | 346 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 347 | { |
0496cf34 | 348 | if (options.compression) { |
349 | /* The member allocation is not visible, so sync it */ | |
350 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
351 | } | |
1853d1ef | 352 | } |
353 | ||
354 | int | |
b5a28cbc | 355 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 356 | struct mon_table **pent) |
357 | { | |
358 | Buffer m; | |
359 | int ret; | |
360 | u_char type; | |
361 | ||
362 | buffer_init(&m); | |
363 | ||
b5a28cbc | 364 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 365 | type = buffer_get_char(&m); |
366 | ||
1588c277 | 367 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 368 | |
369 | while (ent->f != NULL) { | |
370 | if (ent->type == type) | |
371 | break; | |
372 | ent++; | |
373 | } | |
374 | ||
375 | if (ent->f != NULL) { | |
376 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 377 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 378 | type); |
b5a28cbc | 379 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 380 | buffer_free(&m); |
381 | ||
382 | /* The child may use this request only once, disable it */ | |
383 | if (ent->flags & MON_ONCE) { | |
1588c277 | 384 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 385 | type); |
386 | ent->flags &= ~MON_PERMIT; | |
387 | } | |
388 | ||
389 | if (pent != NULL) | |
390 | *pent = ent; | |
391 | ||
392 | return ret; | |
393 | } | |
394 | ||
1588c277 | 395 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 396 | |
397 | /* NOTREACHED */ | |
398 | return (-1); | |
399 | } | |
400 | ||
401 | /* allowed key state */ | |
402 | static int | |
403 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
404 | { | |
405 | /* make sure key is allowed */ | |
406 | if (key_blob == NULL || key_bloblen != bloblen || | |
407 | memcmp(key_blob, blob, key_bloblen)) | |
408 | return (0); | |
409 | return (1); | |
410 | } | |
411 | ||
412 | static void | |
413 | monitor_reset_key_state(void) | |
414 | { | |
415 | /* reset state */ | |
416 | if (key_blob != NULL) | |
417 | xfree(key_blob); | |
418 | if (hostbased_cuser != NULL) | |
419 | xfree(hostbased_cuser); | |
420 | if (hostbased_chost != NULL) | |
421 | xfree(hostbased_chost); | |
422 | key_blob = NULL; | |
423 | key_bloblen = 0; | |
424 | key_blobtype = MM_NOKEY; | |
425 | hostbased_cuser = NULL; | |
426 | hostbased_chost = NULL; | |
427 | } | |
428 | ||
429 | int | |
430 | mm_answer_moduli(int socket, Buffer *m) | |
431 | { | |
432 | DH *dh; | |
433 | int min, want, max; | |
434 | ||
435 | min = buffer_get_int(m); | |
436 | want = buffer_get_int(m); | |
437 | max = buffer_get_int(m); | |
438 | ||
439 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 440 | __func__, min, want, max); |
1853d1ef | 441 | /* We need to check here, too, in case the child got corrupted */ |
442 | if (max < min || want < min || max < want) | |
443 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 444 | __func__, min, want, max); |
1853d1ef | 445 | |
446 | buffer_clear(m); | |
447 | ||
448 | dh = choose_dh(min, want, max); | |
449 | if (dh == NULL) { | |
450 | buffer_put_char(m, 0); | |
451 | return (0); | |
452 | } else { | |
453 | /* Send first bignum */ | |
454 | buffer_put_char(m, 1); | |
455 | buffer_put_bignum2(m, dh->p); | |
456 | buffer_put_bignum2(m, dh->g); | |
457 | ||
458 | DH_free(dh); | |
459 | } | |
460 | mm_request_send(socket, MONITOR_ANS_MODULI, m); | |
461 | return (0); | |
462 | } | |
463 | ||
464 | int | |
465 | mm_answer_sign(int socket, Buffer *m) | |
466 | { | |
467 | Key *key; | |
468 | u_char *p; | |
469 | u_char *signature; | |
470 | u_int siglen, datlen; | |
471 | int keyid; | |
472 | ||
1588c277 | 473 | debug3("%s", __func__); |
1853d1ef | 474 | |
475 | keyid = buffer_get_int(m); | |
476 | p = buffer_get_string(m, &datlen); | |
477 | ||
478 | if (datlen != 20) | |
d1ff09ba | 479 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 480 | |
521d606b | 481 | /* save session id, it will be passed on the first call */ |
482 | if (session_id2_len == 0) { | |
483 | session_id2_len = datlen; | |
484 | session_id2 = xmalloc(session_id2_len); | |
485 | memcpy(session_id2, p, session_id2_len); | |
486 | } | |
487 | ||
1853d1ef | 488 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 489 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 490 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 491 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 492 | |
d1ff09ba | 493 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 494 | |
495 | buffer_clear(m); | |
496 | buffer_put_string(m, signature, siglen); | |
497 | ||
498 | xfree(p); | |
499 | xfree(signature); | |
500 | ||
501 | mm_request_send(socket, MONITOR_ANS_SIGN, m); | |
502 | ||
503 | /* Turn on permissions for getpwnam */ | |
504 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
505 | ||
506 | return (0); | |
507 | } | |
508 | ||
509 | /* Retrieves the password entry and also checks if the user is permitted */ | |
510 | ||
511 | int | |
512 | mm_answer_pwnamallow(int socket, Buffer *m) | |
513 | { | |
514 | char *login; | |
515 | struct passwd *pwent; | |
516 | int allowed = 0; | |
517 | ||
1588c277 | 518 | debug3("%s", __func__); |
1853d1ef | 519 | |
520 | if (authctxt->attempt++ != 0) | |
1588c277 | 521 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 522 | |
523 | login = buffer_get_string(m, NULL); | |
524 | ||
525 | pwent = getpwnamallow(login); | |
526 | ||
527 | authctxt->user = xstrdup(login); | |
528 | setproctitle("%s [priv]", pwent ? login : "unknown"); | |
529 | xfree(login); | |
530 | ||
531 | buffer_clear(m); | |
532 | ||
533 | if (pwent == NULL) { | |
534 | buffer_put_char(m, 0); | |
535 | goto out; | |
536 | } | |
537 | ||
538 | allowed = 1; | |
539 | authctxt->pw = pwent; | |
540 | authctxt->valid = 1; | |
541 | ||
542 | buffer_put_char(m, 1); | |
543 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
544 | buffer_put_cstring(m, pwent->pw_name); | |
545 | buffer_put_cstring(m, "*"); | |
546 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 547 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 548 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 549 | #endif |
1853d1ef | 550 | buffer_put_cstring(m, pwent->pw_dir); |
551 | buffer_put_cstring(m, pwent->pw_shell); | |
552 | ||
553 | out: | |
1588c277 | 554 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
1853d1ef | 555 | mm_request_send(socket, MONITOR_ANS_PWNAM, m); |
556 | ||
557 | /* For SSHv1 allow authentication now */ | |
558 | if (!compat20) | |
559 | monitor_permit_authentications(1); | |
94a73cdc | 560 | else { |
1853d1ef | 561 | /* Allow service/style information on the auth context */ |
562 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 563 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
564 | } | |
1853d1ef | 565 | |
efe44db6 | 566 | #ifdef USE_PAM |
567 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
568 | #endif | |
1853d1ef | 569 | |
570 | return (0); | |
571 | } | |
572 | ||
94a73cdc | 573 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
574 | { | |
575 | char *banner; | |
576 | ||
577 | buffer_clear(m); | |
578 | banner = auth2_read_banner(); | |
579 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
580 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
581 | ||
582 | if (banner != NULL) | |
30e37ee6 | 583 | xfree(banner); |
94a73cdc | 584 | |
585 | return (0); | |
586 | } | |
587 | ||
1853d1ef | 588 | int |
589 | mm_answer_authserv(int socket, Buffer *m) | |
590 | { | |
591 | monitor_permit_authentications(1); | |
592 | ||
593 | authctxt->service = buffer_get_string(m, NULL); | |
594 | authctxt->style = buffer_get_string(m, NULL); | |
595 | debug3("%s: service=%s, style=%s", | |
1588c277 | 596 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 597 | |
598 | if (strlen(authctxt->style) == 0) { | |
599 | xfree(authctxt->style); | |
600 | authctxt->style = NULL; | |
601 | } | |
602 | ||
603 | return (0); | |
604 | } | |
605 | ||
606 | int | |
607 | mm_answer_authpassword(int socket, Buffer *m) | |
608 | { | |
609 | static int call_count; | |
610 | char *passwd; | |
d341742a | 611 | int authenticated; |
612 | u_int plen; | |
1853d1ef | 613 | |
614 | passwd = buffer_get_string(m, &plen); | |
615 | /* Only authenticate if the context is valid */ | |
aa586f8e | 616 | authenticated = options.password_authentication && |
68ece370 | 617 | auth_password(authctxt, passwd) && authctxt->valid; |
1853d1ef | 618 | memset(passwd, 0, strlen(passwd)); |
619 | xfree(passwd); | |
620 | ||
621 | buffer_clear(m); | |
622 | buffer_put_int(m, authenticated); | |
623 | ||
1588c277 | 624 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 625 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
626 | ||
627 | call_count++; | |
628 | if (plen == 0 && call_count == 1) | |
629 | auth_method = "none"; | |
630 | else | |
631 | auth_method = "password"; | |
632 | ||
633 | /* Causes monitor loop to terminate if authenticated */ | |
634 | return (authenticated); | |
635 | } | |
636 | ||
637 | #ifdef BSD_AUTH | |
638 | int | |
639 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
640 | { | |
641 | char *name, *infotxt; | |
642 | u_int numprompts; | |
643 | u_int *echo_on; | |
644 | char **prompts; | |
6d6c25e3 | 645 | u_int success; |
1853d1ef | 646 | |
6d6c25e3 | 647 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
648 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 649 | |
650 | buffer_clear(m); | |
6d6c25e3 | 651 | buffer_put_int(m, success); |
652 | if (success) | |
1853d1ef | 653 | buffer_put_cstring(m, prompts[0]); |
654 | ||
6d6c25e3 | 655 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 656 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
657 | ||
6d6c25e3 | 658 | if (success) { |
1853d1ef | 659 | xfree(name); |
660 | xfree(infotxt); | |
661 | xfree(prompts); | |
662 | xfree(echo_on); | |
663 | } | |
664 | ||
665 | return (0); | |
666 | } | |
667 | ||
668 | int | |
669 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
670 | { | |
671 | char *response; | |
672 | int authok; | |
673 | ||
674 | if (authctxt->as == 0) | |
1588c277 | 675 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 676 | |
677 | response = buffer_get_string(m, NULL); | |
aa586f8e | 678 | authok = options.challenge_response_authentication && |
679 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 680 | authctxt->as = NULL; |
1588c277 | 681 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 682 | xfree(response); |
683 | ||
684 | buffer_clear(m); | |
685 | buffer_put_int(m, authok); | |
686 | ||
1588c277 | 687 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 688 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
689 | ||
690 | auth_method = "bsdauth"; | |
691 | ||
692 | return (authok != 0); | |
693 | } | |
694 | #endif | |
695 | ||
696 | #ifdef SKEY | |
697 | int | |
698 | mm_answer_skeyquery(int socket, Buffer *m) | |
699 | { | |
700 | struct skey skey; | |
701 | char challenge[1024]; | |
6d6c25e3 | 702 | u_int success; |
1853d1ef | 703 | |
6d6c25e3 | 704 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 705 | |
706 | buffer_clear(m); | |
6d6c25e3 | 707 | buffer_put_int(m, success); |
708 | if (success) | |
1853d1ef | 709 | buffer_put_cstring(m, challenge); |
710 | ||
6d6c25e3 | 711 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 712 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
713 | ||
714 | return (0); | |
715 | } | |
716 | ||
717 | int | |
718 | mm_answer_skeyrespond(int socket, Buffer *m) | |
719 | { | |
720 | char *response; | |
721 | int authok; | |
722 | ||
723 | response = buffer_get_string(m, NULL); | |
724 | ||
aa586f8e | 725 | authok = (options.challenge_response_authentication && |
726 | authctxt->valid && | |
1853d1ef | 727 | skey_haskey(authctxt->pw->pw_name) == 0 && |
728 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
729 | ||
730 | xfree(response); | |
731 | ||
732 | buffer_clear(m); | |
733 | buffer_put_int(m, authok); | |
734 | ||
1588c277 | 735 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 736 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
737 | ||
738 | auth_method = "skey"; | |
739 | ||
740 | return (authok != 0); | |
741 | } | |
742 | #endif | |
743 | ||
ad200abb | 744 | #ifdef USE_PAM |
745 | int | |
746 | mm_answer_pam_start(int socket, Buffer *m) | |
747 | { | |
748 | char *user; | |
749 | ||
750 | user = buffer_get_string(m, NULL); | |
751 | ||
752 | start_pam(user); | |
753 | ||
754 | xfree(user); | |
755 | ||
756 | return (0); | |
757 | } | |
05114c74 | 758 | |
759 | static void *sshpam_ctxt, *sshpam_authok; | |
760 | extern KbdintDevice sshpam_device; | |
761 | ||
762 | int | |
763 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
764 | { | |
765 | ||
766 | debug3("%s", __func__); | |
767 | authctxt->user = buffer_get_string(m, NULL); | |
768 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
769 | sshpam_authok = NULL; | |
770 | buffer_clear(m); | |
771 | if (sshpam_ctxt != NULL) { | |
772 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
773 | buffer_put_int(m, 1); | |
774 | } else { | |
775 | buffer_put_int(m, 0); | |
776 | } | |
777 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
778 | return (0); | |
779 | } | |
780 | ||
781 | int | |
782 | mm_answer_pam_query(int socket, Buffer *m) | |
783 | { | |
784 | char *name, *info, **prompts; | |
785 | u_int num, *echo_on; | |
786 | int i, ret; | |
787 | ||
788 | debug3("%s", __func__); | |
789 | sshpam_authok = NULL; | |
790 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
791 | if (ret == 0 && num == 0) | |
792 | sshpam_authok = sshpam_ctxt; | |
793 | if (num > 1 || name == NULL || info == NULL) | |
794 | ret = -1; | |
795 | buffer_clear(m); | |
796 | buffer_put_int(m, ret); | |
797 | buffer_put_cstring(m, name); | |
798 | xfree(name); | |
799 | buffer_put_cstring(m, info); | |
800 | xfree(info); | |
801 | buffer_put_int(m, num); | |
802 | for (i = 0; i < num; ++i) { | |
803 | buffer_put_cstring(m, prompts[i]); | |
804 | xfree(prompts[i]); | |
805 | buffer_put_int(m, echo_on[i]); | |
806 | } | |
807 | if (prompts != NULL) | |
808 | xfree(prompts); | |
809 | if (echo_on != NULL) | |
810 | xfree(echo_on); | |
811 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
812 | return (0); | |
813 | } | |
814 | ||
815 | int | |
816 | mm_answer_pam_respond(int socket, Buffer *m) | |
817 | { | |
818 | char **resp; | |
819 | u_int num; | |
820 | int i, ret; | |
821 | ||
822 | debug3("%s", __func__); | |
823 | sshpam_authok = NULL; | |
824 | num = buffer_get_int(m); | |
825 | if (num > 0) { | |
826 | resp = xmalloc(num * sizeof(char *)); | |
827 | for (i = 0; i < num; ++i) | |
828 | resp[i] = buffer_get_string(m, NULL); | |
829 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
830 | for (i = 0; i < num; ++i) | |
831 | xfree(resp[i]); | |
832 | xfree(resp); | |
833 | } else { | |
834 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
835 | } | |
836 | buffer_clear(m); | |
837 | buffer_put_int(m, ret); | |
838 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
839 | auth_method = "keyboard-interactive/pam"; | |
840 | if (ret == 0) | |
841 | sshpam_authok = sshpam_ctxt; | |
842 | return (0); | |
843 | } | |
844 | ||
845 | int | |
846 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
847 | { | |
848 | ||
849 | debug3("%s", __func__); | |
850 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
851 | buffer_clear(m); | |
852 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
853 | return (sshpam_authok == sshpam_ctxt); | |
854 | } | |
ad200abb | 855 | #endif |
856 | ||
1853d1ef | 857 | static void |
858 | mm_append_debug(Buffer *m) | |
859 | { | |
860 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 861 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 862 | buffer_append(m, buffer_ptr(&auth_debug), |
863 | buffer_len(&auth_debug)); | |
864 | buffer_clear(&auth_debug); | |
865 | } | |
866 | } | |
867 | ||
868 | int | |
869 | mm_answer_keyallowed(int socket, Buffer *m) | |
870 | { | |
871 | Key *key; | |
661e45a0 | 872 | char *cuser, *chost; |
873 | u_char *blob; | |
1853d1ef | 874 | u_int bloblen; |
875 | enum mm_keytype type = 0; | |
876 | int allowed = 0; | |
877 | ||
1588c277 | 878 | debug3("%s entering", __func__); |
1853d1ef | 879 | |
880 | type = buffer_get_int(m); | |
881 | cuser = buffer_get_string(m, NULL); | |
882 | chost = buffer_get_string(m, NULL); | |
883 | blob = buffer_get_string(m, &bloblen); | |
884 | ||
885 | key = key_from_blob(blob, bloblen); | |
886 | ||
887 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
888 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 889 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 890 | |
1588c277 | 891 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 892 | |
893 | if (key != NULL && authctxt->pw != NULL) { | |
894 | switch(type) { | |
895 | case MM_USERKEY: | |
aa586f8e | 896 | allowed = options.pubkey_authentication && |
897 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 898 | break; |
899 | case MM_HOSTKEY: | |
aa586f8e | 900 | allowed = options.hostbased_authentication && |
901 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 902 | cuser, chost, key); |
903 | break; | |
904 | case MM_RSAHOSTKEY: | |
905 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 906 | allowed = options.rhosts_rsa_authentication && |
907 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 908 | cuser, chost, key); |
909 | break; | |
910 | default: | |
1588c277 | 911 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 912 | break; |
913 | } | |
1853d1ef | 914 | } |
3e2f2431 | 915 | if (key != NULL) |
916 | key_free(key); | |
1853d1ef | 917 | |
918 | /* clear temporarily storage (used by verify) */ | |
919 | monitor_reset_key_state(); | |
920 | ||
921 | if (allowed) { | |
922 | /* Save temporarily for comparison in verify */ | |
923 | key_blob = blob; | |
924 | key_bloblen = bloblen; | |
925 | key_blobtype = type; | |
926 | hostbased_cuser = cuser; | |
927 | hostbased_chost = chost; | |
928 | } | |
929 | ||
930 | debug3("%s: key %p is %s", | |
1588c277 | 931 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 932 | |
933 | buffer_clear(m); | |
934 | buffer_put_int(m, allowed); | |
92e15201 | 935 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 936 | |
937 | mm_append_debug(m); | |
938 | ||
939 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
940 | ||
941 | if (type == MM_RSAHOSTKEY) | |
942 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
943 | ||
944 | return (0); | |
945 | } | |
946 | ||
947 | static int | |
948 | monitor_valid_userblob(u_char *data, u_int datalen) | |
949 | { | |
950 | Buffer b; | |
661e45a0 | 951 | char *p; |
1853d1ef | 952 | u_int len; |
953 | int fail = 0; | |
1853d1ef | 954 | |
955 | buffer_init(&b); | |
956 | buffer_append(&b, data, datalen); | |
957 | ||
958 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 959 | p = buffer_ptr(&b); |
960 | len = buffer_len(&b); | |
961 | if ((session_id2 == NULL) || | |
962 | (len < session_id2_len) || | |
963 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
964 | fail++; | |
1853d1ef | 965 | buffer_consume(&b, session_id2_len); |
966 | } else { | |
521d606b | 967 | p = buffer_get_string(&b, &len); |
968 | if ((session_id2 == NULL) || | |
969 | (len != session_id2_len) || | |
970 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 971 | fail++; |
521d606b | 972 | xfree(p); |
1853d1ef | 973 | } |
974 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
975 | fail++; | |
976 | p = buffer_get_string(&b, NULL); | |
977 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 978 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 979 | authctxt->user, p); |
980 | fail++; | |
981 | } | |
982 | xfree(p); | |
983 | buffer_skip_string(&b); | |
984 | if (datafellows & SSH_BUG_PKAUTH) { | |
985 | if (!buffer_get_char(&b)) | |
986 | fail++; | |
987 | } else { | |
988 | p = buffer_get_string(&b, NULL); | |
989 | if (strcmp("publickey", p) != 0) | |
990 | fail++; | |
991 | xfree(p); | |
992 | if (!buffer_get_char(&b)) | |
993 | fail++; | |
994 | buffer_skip_string(&b); | |
995 | } | |
996 | buffer_skip_string(&b); | |
997 | if (buffer_len(&b) != 0) | |
998 | fail++; | |
999 | buffer_free(&b); | |
1000 | return (fail == 0); | |
1001 | } | |
1002 | ||
1003 | static int | |
661e45a0 | 1004 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1005 | char *chost) | |
1853d1ef | 1006 | { |
1007 | Buffer b; | |
661e45a0 | 1008 | char *p; |
1853d1ef | 1009 | u_int len; |
1010 | int fail = 0; | |
1853d1ef | 1011 | |
1012 | buffer_init(&b); | |
1013 | buffer_append(&b, data, datalen); | |
1014 | ||
521d606b | 1015 | p = buffer_get_string(&b, &len); |
1016 | if ((session_id2 == NULL) || | |
1017 | (len != session_id2_len) || | |
1018 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1019 | fail++; |
521d606b | 1020 | xfree(p); |
1021 | ||
1853d1ef | 1022 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1023 | fail++; | |
1024 | p = buffer_get_string(&b, NULL); | |
1025 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1026 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1027 | authctxt->user, p); |
1028 | fail++; | |
1029 | } | |
1030 | xfree(p); | |
1031 | buffer_skip_string(&b); /* service */ | |
1032 | p = buffer_get_string(&b, NULL); | |
1033 | if (strcmp(p, "hostbased") != 0) | |
1034 | fail++; | |
1035 | xfree(p); | |
1036 | buffer_skip_string(&b); /* pkalg */ | |
1037 | buffer_skip_string(&b); /* pkblob */ | |
1038 | ||
1039 | /* verify client host, strip trailing dot if necessary */ | |
1040 | p = buffer_get_string(&b, NULL); | |
1041 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1042 | p[len - 1] = '\0'; | |
1043 | if (strcmp(p, chost) != 0) | |
1044 | fail++; | |
1045 | xfree(p); | |
1046 | ||
1047 | /* verify client user */ | |
1048 | p = buffer_get_string(&b, NULL); | |
1049 | if (strcmp(p, cuser) != 0) | |
1050 | fail++; | |
1051 | xfree(p); | |
1052 | ||
1053 | if (buffer_len(&b) != 0) | |
1054 | fail++; | |
1055 | buffer_free(&b); | |
1056 | return (fail == 0); | |
1057 | } | |
1058 | ||
1059 | int | |
1060 | mm_answer_keyverify(int socket, Buffer *m) | |
1061 | { | |
1062 | Key *key; | |
1063 | u_char *signature, *data, *blob; | |
1064 | u_int signaturelen, datalen, bloblen; | |
1065 | int verified = 0; | |
1066 | int valid_data = 0; | |
1067 | ||
1068 | blob = buffer_get_string(m, &bloblen); | |
1069 | signature = buffer_get_string(m, &signaturelen); | |
1070 | data = buffer_get_string(m, &datalen); | |
1071 | ||
1072 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1073 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1074 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1075 | |
1076 | key = key_from_blob(blob, bloblen); | |
1077 | if (key == NULL) | |
1588c277 | 1078 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1079 | |
1080 | switch (key_blobtype) { | |
1081 | case MM_USERKEY: | |
1082 | valid_data = monitor_valid_userblob(data, datalen); | |
1083 | break; | |
1084 | case MM_HOSTKEY: | |
1085 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1086 | hostbased_cuser, hostbased_chost); | |
1087 | break; | |
1088 | default: | |
1089 | valid_data = 0; | |
1090 | break; | |
1091 | } | |
1092 | if (!valid_data) | |
1588c277 | 1093 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1094 | |
1095 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1096 | debug3("%s: key %p signature %s", | |
1588c277 | 1097 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1098 | |
1099 | key_free(key); | |
1100 | xfree(blob); | |
1101 | xfree(signature); | |
1102 | xfree(data); | |
1103 | ||
d17ef027 | 1104 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1105 | ||
1853d1ef | 1106 | monitor_reset_key_state(); |
1107 | ||
1108 | buffer_clear(m); | |
1109 | buffer_put_int(m, verified); | |
1110 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1111 | ||
1853d1ef | 1112 | return (verified); |
1113 | } | |
1114 | ||
1115 | static void | |
1116 | mm_record_login(Session *s, struct passwd *pw) | |
1117 | { | |
1118 | socklen_t fromlen; | |
1119 | struct sockaddr_storage from; | |
1120 | ||
1121 | /* | |
1122 | * Get IP address of client. If the connection is not a socket, let | |
1123 | * the address be 0.0.0.0. | |
1124 | */ | |
1125 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1126 | fromlen = sizeof(from); |
1853d1ef | 1127 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1128 | if (getpeername(packet_get_connection_in(), |
1129 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1130 | debug("getpeername: %.100s", strerror(errno)); | |
1131 | fatal_cleanup(); | |
1132 | } | |
1133 | } | |
1134 | /* Record that there was a login on that tty from the remote host. */ | |
1135 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
1136 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), | |
ba1566dd | 1137 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1138 | } |
1139 | ||
1140 | static void | |
1141 | mm_session_close(Session *s) | |
1142 | { | |
1588c277 | 1143 | debug3("%s: session %d pid %d", __func__, s->self, s->pid); |
1853d1ef | 1144 | if (s->ttyfd != -1) { |
1588c277 | 1145 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1146 | fatal_remove_cleanup(session_pty_cleanup2, (void *)s); |
1147 | session_pty_cleanup2(s); | |
1148 | } | |
1149 | s->used = 0; | |
1150 | } | |
1151 | ||
1152 | int | |
1153 | mm_answer_pty(int socket, Buffer *m) | |
1154 | { | |
b5a28cbc | 1155 | extern struct monitor *pmonitor; |
1853d1ef | 1156 | Session *s; |
1157 | int res, fd0; | |
1158 | ||
1588c277 | 1159 | debug3("%s entering", __func__); |
1853d1ef | 1160 | |
1161 | buffer_clear(m); | |
1162 | s = session_new(); | |
1163 | if (s == NULL) | |
1164 | goto error; | |
1165 | s->authctxt = authctxt; | |
1166 | s->pw = authctxt->pw; | |
b5a28cbc | 1167 | s->pid = pmonitor->m_pid; |
1853d1ef | 1168 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1169 | if (res == 0) | |
1170 | goto error; | |
1171 | fatal_add_cleanup(session_pty_cleanup2, (void *)s); | |
1172 | pty_setowner(authctxt->pw, s->tty); | |
1173 | ||
1174 | buffer_put_int(m, 1); | |
1175 | buffer_put_cstring(m, s->tty); | |
1176 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1177 | ||
1178 | mm_send_fd(socket, s->ptyfd); | |
1179 | mm_send_fd(socket, s->ttyfd); | |
1180 | ||
1181 | /* We need to trick ttyslot */ | |
1182 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1183 | fatal("%s: dup2", __func__); |
1853d1ef | 1184 | |
1185 | mm_record_login(s, authctxt->pw); | |
1186 | ||
1187 | /* Now we can close the file descriptor again */ | |
1188 | close(0); | |
1189 | ||
1190 | /* make sure nothing uses fd 0 */ | |
1191 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1192 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1193 | if (fd0 != 0) |
1588c277 | 1194 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1195 | |
1196 | /* slave is not needed */ | |
1197 | close(s->ttyfd); | |
1198 | s->ttyfd = s->ptyfd; | |
1199 | /* no need to dup() because nobody closes ptyfd */ | |
1200 | s->ptymaster = s->ptyfd; | |
1201 | ||
1588c277 | 1202 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1203 | |
1204 | return (0); | |
1205 | ||
1206 | error: | |
1207 | if (s != NULL) | |
1208 | mm_session_close(s); | |
1209 | buffer_put_int(m, 0); | |
1210 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1211 | return (0); | |
1212 | } | |
1213 | ||
1214 | int | |
1215 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1216 | { | |
1217 | Session *s; | |
1218 | char *tty; | |
1219 | ||
1588c277 | 1220 | debug3("%s entering", __func__); |
1853d1ef | 1221 | |
1222 | tty = buffer_get_string(m, NULL); | |
1223 | if ((s = session_by_tty(tty)) != NULL) | |
1224 | mm_session_close(s); | |
1225 | buffer_clear(m); | |
1226 | xfree(tty); | |
1227 | return (0); | |
1228 | } | |
1229 | ||
1230 | int | |
1231 | mm_answer_sesskey(int socket, Buffer *m) | |
1232 | { | |
1233 | BIGNUM *p; | |
1234 | int rsafail; | |
1235 | ||
1236 | /* Turn off permissions */ | |
1237 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1238 | ||
1239 | if ((p = BN_new()) == NULL) | |
1588c277 | 1240 | fatal("%s: BN_new", __func__); |
1853d1ef | 1241 | |
1242 | buffer_get_bignum2(m, p); | |
1243 | ||
1244 | rsafail = ssh1_session_key(p); | |
1245 | ||
1246 | buffer_clear(m); | |
1247 | buffer_put_int(m, rsafail); | |
1248 | buffer_put_bignum2(m, p); | |
1249 | ||
1250 | BN_clear_free(p); | |
1251 | ||
1252 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1253 | ||
1254 | /* Turn on permissions for sessid passing */ | |
1255 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1256 | ||
1257 | return (0); | |
1258 | } | |
1259 | ||
1260 | int | |
1261 | mm_answer_sessid(int socket, Buffer *m) | |
1262 | { | |
1263 | int i; | |
1264 | ||
1588c277 | 1265 | debug3("%s entering", __func__); |
1853d1ef | 1266 | |
1267 | if (buffer_len(m) != 16) | |
1588c277 | 1268 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1269 | for (i = 0; i < 16; i++) |
1270 | session_id[i] = buffer_get_char(m); | |
1271 | ||
1272 | /* Turn on permissions for getpwnam */ | |
1273 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1274 | ||
1275 | return (0); | |
1276 | } | |
1277 | ||
1278 | int | |
1279 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1280 | { | |
1281 | BIGNUM *client_n; | |
1282 | Key *key = NULL; | |
1283 | u_char *blob = NULL; | |
1284 | u_int blen = 0; | |
1285 | int allowed = 0; | |
1286 | ||
1588c277 | 1287 | debug3("%s entering", __func__); |
1853d1ef | 1288 | |
aa586f8e | 1289 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1290 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1291 | fatal("%s: BN_new", __func__); |
1853d1ef | 1292 | buffer_get_bignum2(m, client_n); |
1293 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1294 | BN_clear_free(client_n); | |
1295 | } | |
1296 | buffer_clear(m); | |
1297 | buffer_put_int(m, allowed); | |
92e15201 | 1298 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1299 | |
1300 | /* clear temporarily storage (used by generate challenge) */ | |
1301 | monitor_reset_key_state(); | |
1302 | ||
1303 | if (allowed && key != NULL) { | |
1304 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1305 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1306 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1307 | buffer_put_string(m, blob, blen); |
1308 | ||
1309 | /* Save temporarily for comparison in verify */ | |
1310 | key_blob = blob; | |
1311 | key_bloblen = blen; | |
1312 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1313 | } |
3e2f2431 | 1314 | if (key != NULL) |
1315 | key_free(key); | |
1853d1ef | 1316 | |
1317 | mm_append_debug(m); | |
1318 | ||
1319 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1320 | ||
1321 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1322 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1323 | return (0); | |
1324 | } | |
1325 | ||
1326 | int | |
1327 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1328 | { | |
1329 | Key *key = NULL; | |
1330 | u_char *blob; | |
1331 | u_int blen; | |
1332 | ||
1588c277 | 1333 | debug3("%s entering", __func__); |
1853d1ef | 1334 | |
1335 | if (!authctxt->valid) | |
1588c277 | 1336 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1337 | blob = buffer_get_string(m, &blen); |
1338 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1339 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1340 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1341 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1342 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1343 | fatal("%s: received bad key", __func__); |
1853d1ef | 1344 | |
1345 | if (ssh1_challenge) | |
1346 | BN_clear_free(ssh1_challenge); | |
1347 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1348 | ||
1349 | buffer_clear(m); | |
1350 | buffer_put_bignum2(m, ssh1_challenge); | |
1351 | ||
1588c277 | 1352 | debug3("%s sending reply", __func__); |
1853d1ef | 1353 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1354 | ||
1355 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1356 | |
1357 | xfree(blob); | |
1358 | key_free(key); | |
1853d1ef | 1359 | return (0); |
1360 | } | |
1361 | ||
1362 | int | |
1363 | mm_answer_rsa_response(int socket, Buffer *m) | |
1364 | { | |
1365 | Key *key = NULL; | |
1366 | u_char *blob, *response; | |
1367 | u_int blen, len; | |
1368 | int success; | |
1369 | ||
1588c277 | 1370 | debug3("%s entering", __func__); |
1853d1ef | 1371 | |
1372 | if (!authctxt->valid) | |
1588c277 | 1373 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1374 | if (ssh1_challenge == NULL) |
1588c277 | 1375 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1376 | |
1377 | blob = buffer_get_string(m, &blen); | |
1378 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1379 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1380 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1381 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1382 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1383 | fatal("%s: received bad key", __func__); |
1853d1ef | 1384 | response = buffer_get_string(m, &len); |
1385 | if (len != 16) | |
1588c277 | 1386 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1387 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1388 | ||
3e2f2431 | 1389 | xfree(blob); |
1853d1ef | 1390 | key_free(key); |
1391 | xfree(response); | |
1392 | ||
1393 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1394 | ||
1395 | /* reset state */ | |
1396 | BN_clear_free(ssh1_challenge); | |
1397 | ssh1_challenge = NULL; | |
1398 | monitor_reset_key_state(); | |
1399 | ||
1400 | buffer_clear(m); | |
1401 | buffer_put_int(m, success); | |
1402 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1403 | ||
1404 | return (success); | |
1405 | } | |
1406 | ||
2db9d8aa | 1407 | #ifdef KRB4 |
1408 | int | |
1409 | mm_answer_krb4(int socket, Buffer *m) | |
1410 | { | |
1411 | KTEXT_ST auth, reply; | |
1412 | char *client, *p; | |
1413 | int success; | |
1414 | u_int alen; | |
1415 | ||
1416 | reply.length = auth.length = 0; | |
1417 | ||
1418 | p = buffer_get_string(m, &alen); | |
1419 | if (alen >= MAX_KTXT_LEN) | |
1420 | fatal("%s: auth too large", __func__); | |
1421 | memcpy(auth.dat, p, alen); | |
1422 | auth.length = alen; | |
1423 | memset(p, 0, alen); | |
1424 | xfree(p); | |
1425 | ||
1426 | success = options.kerberos_authentication && | |
1427 | authctxt->valid && | |
1428 | auth_krb4(authctxt, &auth, &client, &reply); | |
1429 | ||
1430 | memset(auth.dat, 0, alen); | |
1431 | buffer_clear(m); | |
1432 | buffer_put_int(m, success); | |
1433 | ||
1434 | if (success) { | |
1435 | buffer_put_cstring(m, client); | |
1436 | buffer_put_string(m, reply.dat, reply.length); | |
1437 | if (client) | |
1438 | xfree(client); | |
1439 | if (reply.length) | |
1440 | memset(reply.dat, 0, reply.length); | |
1441 | } | |
1442 | ||
1443 | debug3("%s: sending result %d", __func__, success); | |
1444 | mm_request_send(socket, MONITOR_ANS_KRB4, m); | |
1445 | ||
1446 | auth_method = "kerberos"; | |
1447 | ||
1448 | /* Causes monitor loop to terminate if authenticated */ | |
1449 | return (success); | |
1450 | } | |
1451 | #endif | |
696f6bef | 1452 | |
1453 | #ifdef KRB5 | |
1454 | int | |
1455 | mm_answer_krb5(int socket, Buffer *m) | |
1456 | { | |
1457 | krb5_data tkt, reply; | |
1458 | char *client_user; | |
1459 | u_int len; | |
1460 | int success; | |
1461 | ||
1462 | /* use temporary var to avoid size issues on 64bit arch */ | |
1463 | tkt.data = buffer_get_string(m, &len); | |
1464 | tkt.length = len; | |
1465 | ||
4741e3a6 | 1466 | success = options.kerberos_authentication && |
1467 | authctxt->valid && | |
0082ad34 | 1468 | auth_krb5(authctxt, &tkt, &client_user, &reply); |
696f6bef | 1469 | |
1470 | if (tkt.length) | |
1471 | xfree(tkt.data); | |
1472 | ||
1473 | buffer_clear(m); | |
1474 | buffer_put_int(m, success); | |
1475 | ||
1476 | if (success) { | |
1477 | buffer_put_cstring(m, client_user); | |
1478 | buffer_put_string(m, reply.data, reply.length); | |
1479 | if (client_user) | |
1480 | xfree(client_user); | |
1481 | if (reply.length) | |
1482 | xfree(reply.data); | |
1483 | } | |
1484 | mm_request_send(socket, MONITOR_ANS_KRB5, m); | |
1485 | ||
1486 | return success; | |
1487 | } | |
1488 | #endif | |
1489 | ||
1853d1ef | 1490 | int |
1491 | mm_answer_term(int socket, Buffer *req) | |
1492 | { | |
b5a28cbc | 1493 | extern struct monitor *pmonitor; |
1853d1ef | 1494 | int res, status; |
1495 | ||
1588c277 | 1496 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1497 | |
1498 | /* The child is terminating */ | |
1499 | session_destroy_all(&mm_session_close); | |
1500 | ||
b5a28cbc | 1501 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1502 | if (errno != EINTR) |
1503 | exit(1); | |
1853d1ef | 1504 | |
1505 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1506 | ||
1507 | /* Terminate process */ | |
1508 | exit (res); | |
1509 | } | |
1510 | ||
1511 | void | |
b5a28cbc | 1512 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1513 | { |
1514 | if (compat20) { | |
1515 | set_newkeys(MODE_IN); | |
1516 | set_newkeys(MODE_OUT); | |
1517 | } else { | |
1853d1ef | 1518 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1519 | packet_set_encryption_key(child_state.ssh1key, |
1520 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1521 | xfree(child_state.ssh1key); | |
1853d1ef | 1522 | } |
1523 | ||
9459414c | 1524 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1525 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1526 | xfree(child_state.keyout); | |
1527 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1528 | xfree(child_state.keyin); | |
1529 | ||
1530 | if (!compat20) { | |
1531 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1532 | xfree(child_state.ivout); | |
1533 | packet_set_iv(MODE_IN, child_state.ivin); | |
1534 | xfree(child_state.ivin); | |
1535 | } | |
1536 | ||
1537 | memcpy(&incoming_stream, &child_state.incoming, | |
1538 | sizeof(incoming_stream)); | |
1539 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1540 | sizeof(outgoing_stream)); | |
1541 | ||
1542 | /* Update with new address */ | |
0496cf34 | 1543 | if (options.compression) |
1544 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1545 | |
1546 | /* Network I/O buffers */ | |
1547 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1548 | buffer_clear(&input); | |
1549 | buffer_append(&input, child_state.input, child_state.ilen); | |
1550 | memset(child_state.input, 0, child_state.ilen); | |
1551 | xfree(child_state.input); | |
1552 | ||
1553 | buffer_clear(&output); | |
1554 | buffer_append(&output, child_state.output, child_state.olen); | |
1555 | memset(child_state.output, 0, child_state.olen); | |
1556 | xfree(child_state.output); | |
1557 | } | |
1558 | ||
1559 | static Kex * | |
1560 | mm_get_kex(Buffer *m) | |
1561 | { | |
1562 | Kex *kex; | |
1563 | void *blob; | |
1564 | u_int bloblen; | |
1565 | ||
1566 | kex = xmalloc(sizeof(*kex)); | |
1567 | memset(kex, 0, sizeof(*kex)); | |
1568 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1569 | if ((session_id2 == NULL) || |
1570 | (kex->session_id_len != session_id2_len) || | |
1571 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1572 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1573 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1574 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1575 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1576 | kex->server = 1; |
1577 | kex->hostkey_type = buffer_get_int(m); | |
1578 | kex->kex_type = buffer_get_int(m); | |
1579 | blob = buffer_get_string(m, &bloblen); | |
1580 | buffer_init(&kex->my); | |
1581 | buffer_append(&kex->my, blob, bloblen); | |
1582 | xfree(blob); | |
1583 | blob = buffer_get_string(m, &bloblen); | |
1584 | buffer_init(&kex->peer); | |
1585 | buffer_append(&kex->peer, blob, bloblen); | |
1586 | xfree(blob); | |
1587 | kex->done = 1; | |
1588 | kex->flags = buffer_get_int(m); | |
1589 | kex->client_version_string = buffer_get_string(m, NULL); | |
1590 | kex->server_version_string = buffer_get_string(m, NULL); | |
1591 | kex->load_host_key=&get_hostkey_by_type; | |
1592 | kex->host_key_index=&get_hostkey_index; | |
1593 | ||
1594 | return (kex); | |
1595 | } | |
1596 | ||
1597 | /* This function requries careful sanity checking */ | |
1598 | ||
1599 | void | |
b5a28cbc | 1600 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1601 | { |
1602 | Buffer m; | |
1603 | u_char *blob, *p; | |
1604 | u_int bloblen, plen; | |
ffd7b36b | 1605 | u_int32_t seqnr, packets; |
1606 | u_int64_t blocks; | |
1853d1ef | 1607 | |
1588c277 | 1608 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1609 | |
1610 | buffer_init(&m); | |
b5a28cbc | 1611 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1612 | if (!compat20) { |
1613 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1614 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1615 | child_state.ssh1key = buffer_get_string(&m, |
1616 | &child_state.ssh1keylen); | |
1853d1ef | 1617 | child_state.ivout = buffer_get_string(&m, |
1618 | &child_state.ivoutlen); | |
1619 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1620 | goto skip; | |
1621 | } else { | |
1622 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1623 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1624 | } |
1625 | ||
1626 | blob = buffer_get_string(&m, &bloblen); | |
1627 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1628 | xfree(blob); | |
1629 | ||
1588c277 | 1630 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1631 | blob = buffer_get_string(&m, &bloblen); |
1632 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1633 | xfree(blob); | |
1634 | ||
1635 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1636 | seqnr = buffer_get_int(&m); |
1637 | blocks = buffer_get_int64(&m); | |
1638 | packets = buffer_get_int(&m); | |
1639 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1640 | seqnr = buffer_get_int(&m); | |
1641 | blocks = buffer_get_int64(&m); | |
1642 | packets = buffer_get_int(&m); | |
1643 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1644 | |
1645 | skip: | |
1646 | /* Get the key context */ | |
1647 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1648 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1649 | ||
1588c277 | 1650 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1651 | /* Get compression state */ |
1652 | p = buffer_get_string(&m, &plen); | |
1653 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1654 | fatal("%s: bad request size", __func__); |
1853d1ef | 1655 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1656 | xfree(p); | |
1657 | ||
1658 | p = buffer_get_string(&m, &plen); | |
1659 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1660 | fatal("%s: bad request size", __func__); |
1853d1ef | 1661 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1662 | xfree(p); | |
1663 | ||
1664 | /* Network I/O buffers */ | |
1588c277 | 1665 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1666 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1667 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1668 | ||
1669 | buffer_free(&m); | |
1670 | } | |
1671 | ||
1672 | ||
1673 | /* Allocation functions for zlib */ | |
1674 | void * | |
1675 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1676 | { | |
39e71188 | 1677 | size_t len = (size_t) size * ncount; |
1853d1ef | 1678 | void *address; |
1679 | ||
b85698ab | 1680 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1681 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1682 | ||
1683 | address = mm_malloc(mm, len); | |
1853d1ef | 1684 | |
1685 | return (address); | |
1686 | } | |
1687 | ||
1688 | void | |
1689 | mm_zfree(struct mm_master *mm, void *address) | |
1690 | { | |
1691 | mm_free(mm, address); | |
1692 | } | |
1693 | ||
1694 | void | |
1695 | mm_init_compression(struct mm_master *mm) | |
1696 | { | |
1697 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1698 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1699 | outgoing_stream.opaque = mm; | |
1700 | ||
1701 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1702 | incoming_stream.zfree = (free_func)mm_zfree; | |
1703 | incoming_stream.opaque = mm; | |
1704 | } | |
1705 | ||
1706 | /* XXX */ | |
1707 | ||
1708 | #define FD_CLOSEONEXEC(x) do { \ | |
1709 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1710 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1711 | } while (0) | |
1712 | ||
1713 | static void | |
1714 | monitor_socketpair(int *pair) | |
1715 | { | |
f1af2dbf | 1716 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1717 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1718 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1719 | #else |
1720 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1721 | __func__); |
f1af2dbf | 1722 | #endif |
1853d1ef | 1723 | FD_CLOSEONEXEC(pair[0]); |
1724 | FD_CLOSEONEXEC(pair[1]); | |
1725 | } | |
1726 | ||
1727 | #define MM_MEMSIZE 65536 | |
1728 | ||
1729 | struct monitor * | |
1730 | monitor_init(void) | |
1731 | { | |
1732 | struct monitor *mon; | |
1733 | int pair[2]; | |
1734 | ||
1735 | mon = xmalloc(sizeof(*mon)); | |
1736 | ||
1737 | monitor_socketpair(pair); | |
1738 | ||
1739 | mon->m_recvfd = pair[0]; | |
1740 | mon->m_sendfd = pair[1]; | |
1741 | ||
1742 | /* Used to share zlib space across processes */ | |
0496cf34 | 1743 | if (options.compression) { |
1744 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1745 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1746 | |
0496cf34 | 1747 | /* Compression needs to share state across borders */ |
1748 | mm_init_compression(mon->m_zlib); | |
1749 | } | |
1853d1ef | 1750 | |
1751 | return mon; | |
1752 | } | |
1753 | ||
1754 | void | |
1755 | monitor_reinit(struct monitor *mon) | |
1756 | { | |
1757 | int pair[2]; | |
1758 | ||
1759 | monitor_socketpair(pair); | |
1760 | ||
1761 | mon->m_recvfd = pair[0]; | |
1762 | mon->m_sendfd = pair[1]; | |
1763 | } |