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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" | |
b9ed513a | 28 | RCSID("$OpenBSD: monitor.c,v 1.41 2003/05/24 09:30:40 djm 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; | |
3a39206f | 146 | static pid_t monitor_child_pid; |
1853d1ef | 147 | |
148 | struct mon_table { | |
149 | enum monitor_reqtype type; | |
150 | int flags; | |
151 | int (*f)(int, Buffer *); | |
152 | }; | |
153 | ||
154 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
155 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
156 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
157 | ||
158 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
159 | ||
160 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
161 | ||
162 | struct mon_table mon_dispatch_proto20[] = { | |
163 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
164 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
165 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
166 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 167 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 168 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 169 | #ifdef USE_PAM |
170 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
05114c74 | 171 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
172 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
173 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
174 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 175 | #endif |
1853d1ef | 176 | #ifdef BSD_AUTH |
177 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
178 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
179 | #endif | |
180 | #ifdef SKEY | |
181 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
182 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
183 | #endif | |
184 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
185 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
802e01b8 | 186 | #ifdef KRB5 |
187 | {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5}, | |
188 | #endif | |
1853d1ef | 189 | {0, 0, NULL} |
190 | }; | |
191 | ||
192 | struct mon_table mon_dispatch_postauth20[] = { | |
193 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
194 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
195 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
196 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
197 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
198 | {0, 0, NULL} | |
199 | }; | |
200 | ||
201 | struct mon_table mon_dispatch_proto15[] = { | |
202 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
203 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
204 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
205 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
206 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
207 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
208 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
209 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
210 | #ifdef BSD_AUTH | |
211 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
212 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
213 | #endif | |
214 | #ifdef SKEY | |
215 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
216 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 217 | #endif |
218 | #ifdef USE_PAM | |
219 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
05114c74 | 220 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
221 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
222 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
223 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
696f6bef | 224 | #endif |
2db9d8aa | 225 | #ifdef KRB4 |
226 | {MONITOR_REQ_KRB4, MON_ONCE|MON_AUTH, mm_answer_krb4}, | |
227 | #endif | |
696f6bef | 228 | #ifdef KRB5 |
229 | {MONITOR_REQ_KRB5, MON_ONCE|MON_AUTH, mm_answer_krb5}, | |
1853d1ef | 230 | #endif |
231 | {0, 0, NULL} | |
232 | }; | |
233 | ||
234 | struct mon_table mon_dispatch_postauth15[] = { | |
235 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
236 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
237 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
238 | {0, 0, NULL} | |
239 | }; | |
240 | ||
241 | struct mon_table *mon_dispatch; | |
242 | ||
243 | /* Specifies if a certain message is allowed at the moment */ | |
244 | ||
245 | static void | |
246 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
247 | { | |
248 | while (ent->f != NULL) { | |
249 | if (ent->type == type) { | |
250 | ent->flags &= ~MON_PERMIT; | |
251 | ent->flags |= permit ? MON_PERMIT : 0; | |
252 | return; | |
253 | } | |
254 | ent++; | |
255 | } | |
256 | } | |
257 | ||
258 | static void | |
259 | monitor_permit_authentications(int permit) | |
260 | { | |
261 | struct mon_table *ent = mon_dispatch; | |
262 | ||
263 | while (ent->f != NULL) { | |
264 | if (ent->flags & MON_AUTH) { | |
265 | ent->flags &= ~MON_PERMIT; | |
266 | ent->flags |= permit ? MON_PERMIT : 0; | |
267 | } | |
268 | ent++; | |
269 | } | |
270 | } | |
271 | ||
272 | Authctxt * | |
b5a28cbc | 273 | monitor_child_preauth(struct monitor *pmonitor) |
1853d1ef | 274 | { |
275 | struct mon_table *ent; | |
276 | int authenticated = 0; | |
277 | ||
278 | debug3("preauth child monitor started"); | |
279 | ||
280 | if (compat20) { | |
281 | mon_dispatch = mon_dispatch_proto20; | |
282 | ||
283 | /* Permit requests for moduli and signatures */ | |
284 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
285 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
286 | } else { | |
287 | mon_dispatch = mon_dispatch_proto15; | |
288 | ||
289 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
290 | } | |
291 | ||
292 | authctxt = authctxt_new(); | |
293 | ||
294 | /* The first few requests do not require asynchronous access */ | |
295 | while (!authenticated) { | |
b5a28cbc | 296 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 297 | if (authenticated) { |
298 | if (!(ent->flags & MON_AUTHDECIDE)) | |
299 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 300 | __func__, ent->type); |
1853d1ef | 301 | if (authctxt->pw->pw_uid == 0 && |
302 | !auth_root_allowed(auth_method)) | |
303 | authenticated = 0; | |
304 | } | |
305 | ||
306 | if (ent->flags & MON_AUTHDECIDE) { | |
307 | auth_log(authctxt, authenticated, auth_method, | |
308 | compat20 ? " ssh2" : ""); | |
309 | if (!authenticated) | |
310 | authctxt->failures++; | |
311 | } | |
312 | } | |
313 | ||
314 | if (!authctxt->valid) | |
1588c277 | 315 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 316 | |
317 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 318 | __func__, authctxt->user); |
1853d1ef | 319 | |
b5a28cbc | 320 | mm_get_keystate(pmonitor); |
1853d1ef | 321 | |
322 | return (authctxt); | |
323 | } | |
324 | ||
3a39206f | 325 | static void |
326 | monitor_set_child_handler(pid_t pid) | |
327 | { | |
328 | monitor_child_pid = pid; | |
329 | } | |
330 | ||
331 | static void | |
332 | monitor_child_handler(int signal) | |
333 | { | |
334 | kill(monitor_child_pid, signal); | |
335 | } | |
336 | ||
1853d1ef | 337 | void |
b5a28cbc | 338 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 339 | { |
3a39206f | 340 | monitor_set_child_handler(pmonitor->m_pid); |
341 | signal(SIGHUP, &monitor_child_handler); | |
342 | signal(SIGTERM, &monitor_child_handler); | |
343 | ||
1853d1ef | 344 | if (compat20) { |
345 | mon_dispatch = mon_dispatch_postauth20; | |
346 | ||
347 | /* Permit requests for moduli and signatures */ | |
348 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
349 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
350 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
351 | ||
352 | } else { | |
353 | mon_dispatch = mon_dispatch_postauth15; | |
354 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
355 | } | |
356 | if (!no_pty_flag) { | |
357 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
358 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
359 | } | |
360 | ||
361 | for (;;) | |
b5a28cbc | 362 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 363 | } |
364 | ||
365 | void | |
b5a28cbc | 366 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 367 | { |
0496cf34 | 368 | if (options.compression) { |
369 | /* The member allocation is not visible, so sync it */ | |
370 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
371 | } | |
1853d1ef | 372 | } |
373 | ||
374 | int | |
b5a28cbc | 375 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 376 | struct mon_table **pent) |
377 | { | |
378 | Buffer m; | |
379 | int ret; | |
380 | u_char type; | |
381 | ||
382 | buffer_init(&m); | |
383 | ||
b5a28cbc | 384 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 385 | type = buffer_get_char(&m); |
386 | ||
1588c277 | 387 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 388 | |
389 | while (ent->f != NULL) { | |
390 | if (ent->type == type) | |
391 | break; | |
392 | ent++; | |
393 | } | |
394 | ||
395 | if (ent->f != NULL) { | |
396 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 397 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 398 | type); |
b5a28cbc | 399 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 400 | buffer_free(&m); |
401 | ||
402 | /* The child may use this request only once, disable it */ | |
403 | if (ent->flags & MON_ONCE) { | |
1588c277 | 404 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 405 | type); |
406 | ent->flags &= ~MON_PERMIT; | |
407 | } | |
408 | ||
409 | if (pent != NULL) | |
410 | *pent = ent; | |
411 | ||
412 | return ret; | |
413 | } | |
414 | ||
1588c277 | 415 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 416 | |
417 | /* NOTREACHED */ | |
418 | return (-1); | |
419 | } | |
420 | ||
421 | /* allowed key state */ | |
422 | static int | |
423 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
424 | { | |
425 | /* make sure key is allowed */ | |
426 | if (key_blob == NULL || key_bloblen != bloblen || | |
427 | memcmp(key_blob, blob, key_bloblen)) | |
428 | return (0); | |
429 | return (1); | |
430 | } | |
431 | ||
432 | static void | |
433 | monitor_reset_key_state(void) | |
434 | { | |
435 | /* reset state */ | |
436 | if (key_blob != NULL) | |
437 | xfree(key_blob); | |
438 | if (hostbased_cuser != NULL) | |
439 | xfree(hostbased_cuser); | |
440 | if (hostbased_chost != NULL) | |
441 | xfree(hostbased_chost); | |
442 | key_blob = NULL; | |
443 | key_bloblen = 0; | |
444 | key_blobtype = MM_NOKEY; | |
445 | hostbased_cuser = NULL; | |
446 | hostbased_chost = NULL; | |
447 | } | |
448 | ||
449 | int | |
450 | mm_answer_moduli(int socket, Buffer *m) | |
451 | { | |
452 | DH *dh; | |
453 | int min, want, max; | |
454 | ||
455 | min = buffer_get_int(m); | |
456 | want = buffer_get_int(m); | |
457 | max = buffer_get_int(m); | |
458 | ||
459 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 460 | __func__, min, want, max); |
1853d1ef | 461 | /* We need to check here, too, in case the child got corrupted */ |
462 | if (max < min || want < min || max < want) | |
463 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 464 | __func__, min, want, max); |
1853d1ef | 465 | |
466 | buffer_clear(m); | |
467 | ||
468 | dh = choose_dh(min, want, max); | |
469 | if (dh == NULL) { | |
470 | buffer_put_char(m, 0); | |
471 | return (0); | |
472 | } else { | |
473 | /* Send first bignum */ | |
474 | buffer_put_char(m, 1); | |
475 | buffer_put_bignum2(m, dh->p); | |
476 | buffer_put_bignum2(m, dh->g); | |
477 | ||
478 | DH_free(dh); | |
479 | } | |
480 | mm_request_send(socket, MONITOR_ANS_MODULI, m); | |
481 | return (0); | |
482 | } | |
483 | ||
484 | int | |
485 | mm_answer_sign(int socket, Buffer *m) | |
486 | { | |
487 | Key *key; | |
488 | u_char *p; | |
489 | u_char *signature; | |
490 | u_int siglen, datlen; | |
491 | int keyid; | |
492 | ||
1588c277 | 493 | debug3("%s", __func__); |
1853d1ef | 494 | |
495 | keyid = buffer_get_int(m); | |
496 | p = buffer_get_string(m, &datlen); | |
497 | ||
498 | if (datlen != 20) | |
d1ff09ba | 499 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 500 | |
521d606b | 501 | /* save session id, it will be passed on the first call */ |
502 | if (session_id2_len == 0) { | |
503 | session_id2_len = datlen; | |
504 | session_id2 = xmalloc(session_id2_len); | |
505 | memcpy(session_id2, p, session_id2_len); | |
506 | } | |
507 | ||
1853d1ef | 508 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 509 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 510 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 511 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 512 | |
d1ff09ba | 513 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 514 | |
515 | buffer_clear(m); | |
516 | buffer_put_string(m, signature, siglen); | |
517 | ||
518 | xfree(p); | |
519 | xfree(signature); | |
520 | ||
521 | mm_request_send(socket, MONITOR_ANS_SIGN, m); | |
522 | ||
523 | /* Turn on permissions for getpwnam */ | |
524 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
525 | ||
526 | return (0); | |
527 | } | |
528 | ||
529 | /* Retrieves the password entry and also checks if the user is permitted */ | |
530 | ||
531 | int | |
532 | mm_answer_pwnamallow(int socket, Buffer *m) | |
533 | { | |
534 | char *login; | |
535 | struct passwd *pwent; | |
536 | int allowed = 0; | |
537 | ||
1588c277 | 538 | debug3("%s", __func__); |
1853d1ef | 539 | |
540 | if (authctxt->attempt++ != 0) | |
1588c277 | 541 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 542 | |
543 | login = buffer_get_string(m, NULL); | |
544 | ||
545 | pwent = getpwnamallow(login); | |
546 | ||
547 | authctxt->user = xstrdup(login); | |
548 | setproctitle("%s [priv]", pwent ? login : "unknown"); | |
549 | xfree(login); | |
550 | ||
551 | buffer_clear(m); | |
552 | ||
553 | if (pwent == NULL) { | |
554 | buffer_put_char(m, 0); | |
555 | goto out; | |
556 | } | |
557 | ||
558 | allowed = 1; | |
559 | authctxt->pw = pwent; | |
560 | authctxt->valid = 1; | |
561 | ||
562 | buffer_put_char(m, 1); | |
563 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
564 | buffer_put_cstring(m, pwent->pw_name); | |
565 | buffer_put_cstring(m, "*"); | |
566 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 567 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 568 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 569 | #endif |
1853d1ef | 570 | buffer_put_cstring(m, pwent->pw_dir); |
571 | buffer_put_cstring(m, pwent->pw_shell); | |
572 | ||
573 | out: | |
1588c277 | 574 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
1853d1ef | 575 | mm_request_send(socket, MONITOR_ANS_PWNAM, m); |
576 | ||
577 | /* For SSHv1 allow authentication now */ | |
578 | if (!compat20) | |
579 | monitor_permit_authentications(1); | |
94a73cdc | 580 | else { |
1853d1ef | 581 | /* Allow service/style information on the auth context */ |
582 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 583 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
584 | } | |
1853d1ef | 585 | |
efe44db6 | 586 | #ifdef USE_PAM |
7fceb20d | 587 | if (options.use_pam) |
588 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 589 | #endif |
1853d1ef | 590 | |
591 | return (0); | |
592 | } | |
593 | ||
94a73cdc | 594 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
595 | { | |
596 | char *banner; | |
597 | ||
598 | buffer_clear(m); | |
599 | banner = auth2_read_banner(); | |
600 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
601 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
602 | ||
603 | if (banner != NULL) | |
30e37ee6 | 604 | xfree(banner); |
94a73cdc | 605 | |
606 | return (0); | |
607 | } | |
608 | ||
1853d1ef | 609 | int |
610 | mm_answer_authserv(int socket, Buffer *m) | |
611 | { | |
612 | monitor_permit_authentications(1); | |
613 | ||
614 | authctxt->service = buffer_get_string(m, NULL); | |
615 | authctxt->style = buffer_get_string(m, NULL); | |
616 | debug3("%s: service=%s, style=%s", | |
1588c277 | 617 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 618 | |
619 | if (strlen(authctxt->style) == 0) { | |
620 | xfree(authctxt->style); | |
621 | authctxt->style = NULL; | |
622 | } | |
623 | ||
624 | return (0); | |
625 | } | |
626 | ||
627 | int | |
628 | mm_answer_authpassword(int socket, Buffer *m) | |
629 | { | |
630 | static int call_count; | |
631 | char *passwd; | |
d341742a | 632 | int authenticated; |
633 | u_int plen; | |
1853d1ef | 634 | |
635 | passwd = buffer_get_string(m, &plen); | |
636 | /* Only authenticate if the context is valid */ | |
aa586f8e | 637 | authenticated = options.password_authentication && |
68ece370 | 638 | auth_password(authctxt, passwd) && authctxt->valid; |
1853d1ef | 639 | memset(passwd, 0, strlen(passwd)); |
640 | xfree(passwd); | |
641 | ||
642 | buffer_clear(m); | |
643 | buffer_put_int(m, authenticated); | |
644 | ||
1588c277 | 645 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 646 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
647 | ||
648 | call_count++; | |
649 | if (plen == 0 && call_count == 1) | |
650 | auth_method = "none"; | |
651 | else | |
652 | auth_method = "password"; | |
653 | ||
654 | /* Causes monitor loop to terminate if authenticated */ | |
655 | return (authenticated); | |
656 | } | |
657 | ||
658 | #ifdef BSD_AUTH | |
659 | int | |
660 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
661 | { | |
662 | char *name, *infotxt; | |
663 | u_int numprompts; | |
664 | u_int *echo_on; | |
665 | char **prompts; | |
6d6c25e3 | 666 | u_int success; |
1853d1ef | 667 | |
6d6c25e3 | 668 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
669 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 670 | |
671 | buffer_clear(m); | |
6d6c25e3 | 672 | buffer_put_int(m, success); |
673 | if (success) | |
1853d1ef | 674 | buffer_put_cstring(m, prompts[0]); |
675 | ||
6d6c25e3 | 676 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 677 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
678 | ||
6d6c25e3 | 679 | if (success) { |
1853d1ef | 680 | xfree(name); |
681 | xfree(infotxt); | |
682 | xfree(prompts); | |
683 | xfree(echo_on); | |
684 | } | |
685 | ||
686 | return (0); | |
687 | } | |
688 | ||
689 | int | |
690 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
691 | { | |
692 | char *response; | |
693 | int authok; | |
694 | ||
695 | if (authctxt->as == 0) | |
1588c277 | 696 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 697 | |
698 | response = buffer_get_string(m, NULL); | |
aa586f8e | 699 | authok = options.challenge_response_authentication && |
700 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 701 | authctxt->as = NULL; |
1588c277 | 702 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 703 | xfree(response); |
704 | ||
705 | buffer_clear(m); | |
706 | buffer_put_int(m, authok); | |
707 | ||
1588c277 | 708 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 709 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
710 | ||
711 | auth_method = "bsdauth"; | |
712 | ||
713 | return (authok != 0); | |
714 | } | |
715 | #endif | |
716 | ||
717 | #ifdef SKEY | |
718 | int | |
719 | mm_answer_skeyquery(int socket, Buffer *m) | |
720 | { | |
721 | struct skey skey; | |
722 | char challenge[1024]; | |
6d6c25e3 | 723 | u_int success; |
1853d1ef | 724 | |
6d6c25e3 | 725 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 726 | |
727 | buffer_clear(m); | |
6d6c25e3 | 728 | buffer_put_int(m, success); |
729 | if (success) | |
1853d1ef | 730 | buffer_put_cstring(m, challenge); |
731 | ||
6d6c25e3 | 732 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 733 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
734 | ||
735 | return (0); | |
736 | } | |
737 | ||
738 | int | |
739 | mm_answer_skeyrespond(int socket, Buffer *m) | |
740 | { | |
741 | char *response; | |
742 | int authok; | |
743 | ||
744 | response = buffer_get_string(m, NULL); | |
745 | ||
aa586f8e | 746 | authok = (options.challenge_response_authentication && |
747 | authctxt->valid && | |
1853d1ef | 748 | skey_haskey(authctxt->pw->pw_name) == 0 && |
749 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
750 | ||
751 | xfree(response); | |
752 | ||
753 | buffer_clear(m); | |
754 | buffer_put_int(m, authok); | |
755 | ||
1588c277 | 756 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 757 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
758 | ||
759 | auth_method = "skey"; | |
760 | ||
761 | return (authok != 0); | |
762 | } | |
763 | #endif | |
764 | ||
ad200abb | 765 | #ifdef USE_PAM |
766 | int | |
767 | mm_answer_pam_start(int socket, Buffer *m) | |
768 | { | |
769 | char *user; | |
770 | ||
7fceb20d | 771 | if (!options.use_pam) |
772 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
773 | ||
ad200abb | 774 | user = buffer_get_string(m, NULL); |
775 | ||
776 | start_pam(user); | |
777 | ||
778 | xfree(user); | |
779 | ||
780 | return (0); | |
781 | } | |
05114c74 | 782 | |
783 | static void *sshpam_ctxt, *sshpam_authok; | |
784 | extern KbdintDevice sshpam_device; | |
785 | ||
786 | int | |
787 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
788 | { | |
789 | ||
790 | debug3("%s", __func__); | |
791 | authctxt->user = buffer_get_string(m, NULL); | |
792 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
793 | sshpam_authok = NULL; | |
794 | buffer_clear(m); | |
795 | if (sshpam_ctxt != NULL) { | |
796 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
797 | buffer_put_int(m, 1); | |
798 | } else { | |
799 | buffer_put_int(m, 0); | |
800 | } | |
801 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
802 | return (0); | |
803 | } | |
804 | ||
805 | int | |
806 | mm_answer_pam_query(int socket, Buffer *m) | |
807 | { | |
808 | char *name, *info, **prompts; | |
809 | u_int num, *echo_on; | |
810 | int i, ret; | |
811 | ||
812 | debug3("%s", __func__); | |
813 | sshpam_authok = NULL; | |
814 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
815 | if (ret == 0 && num == 0) | |
816 | sshpam_authok = sshpam_ctxt; | |
817 | if (num > 1 || name == NULL || info == NULL) | |
818 | ret = -1; | |
819 | buffer_clear(m); | |
820 | buffer_put_int(m, ret); | |
821 | buffer_put_cstring(m, name); | |
822 | xfree(name); | |
823 | buffer_put_cstring(m, info); | |
824 | xfree(info); | |
825 | buffer_put_int(m, num); | |
826 | for (i = 0; i < num; ++i) { | |
827 | buffer_put_cstring(m, prompts[i]); | |
828 | xfree(prompts[i]); | |
829 | buffer_put_int(m, echo_on[i]); | |
830 | } | |
831 | if (prompts != NULL) | |
832 | xfree(prompts); | |
833 | if (echo_on != NULL) | |
834 | xfree(echo_on); | |
835 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
836 | return (0); | |
837 | } | |
838 | ||
839 | int | |
840 | mm_answer_pam_respond(int socket, Buffer *m) | |
841 | { | |
842 | char **resp; | |
843 | u_int num; | |
844 | int i, ret; | |
845 | ||
846 | debug3("%s", __func__); | |
847 | sshpam_authok = NULL; | |
848 | num = buffer_get_int(m); | |
849 | if (num > 0) { | |
850 | resp = xmalloc(num * sizeof(char *)); | |
851 | for (i = 0; i < num; ++i) | |
852 | resp[i] = buffer_get_string(m, NULL); | |
853 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
854 | for (i = 0; i < num; ++i) | |
855 | xfree(resp[i]); | |
856 | xfree(resp); | |
857 | } else { | |
858 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
859 | } | |
860 | buffer_clear(m); | |
861 | buffer_put_int(m, ret); | |
862 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
863 | auth_method = "keyboard-interactive/pam"; | |
864 | if (ret == 0) | |
865 | sshpam_authok = sshpam_ctxt; | |
866 | return (0); | |
867 | } | |
868 | ||
869 | int | |
870 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
871 | { | |
872 | ||
873 | debug3("%s", __func__); | |
874 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
875 | buffer_clear(m); | |
876 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
877 | return (sshpam_authok == sshpam_ctxt); | |
878 | } | |
ad200abb | 879 | #endif |
880 | ||
1853d1ef | 881 | static void |
882 | mm_append_debug(Buffer *m) | |
883 | { | |
884 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 885 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 886 | buffer_append(m, buffer_ptr(&auth_debug), |
887 | buffer_len(&auth_debug)); | |
888 | buffer_clear(&auth_debug); | |
889 | } | |
890 | } | |
891 | ||
892 | int | |
893 | mm_answer_keyallowed(int socket, Buffer *m) | |
894 | { | |
895 | Key *key; | |
661e45a0 | 896 | char *cuser, *chost; |
897 | u_char *blob; | |
1853d1ef | 898 | u_int bloblen; |
899 | enum mm_keytype type = 0; | |
900 | int allowed = 0; | |
901 | ||
1588c277 | 902 | debug3("%s entering", __func__); |
1853d1ef | 903 | |
904 | type = buffer_get_int(m); | |
905 | cuser = buffer_get_string(m, NULL); | |
906 | chost = buffer_get_string(m, NULL); | |
907 | blob = buffer_get_string(m, &bloblen); | |
908 | ||
909 | key = key_from_blob(blob, bloblen); | |
910 | ||
911 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
912 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 913 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 914 | |
1588c277 | 915 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 916 | |
917 | if (key != NULL && authctxt->pw != NULL) { | |
918 | switch(type) { | |
919 | case MM_USERKEY: | |
aa586f8e | 920 | allowed = options.pubkey_authentication && |
921 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 922 | break; |
923 | case MM_HOSTKEY: | |
aa586f8e | 924 | allowed = options.hostbased_authentication && |
925 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 926 | cuser, chost, key); |
927 | break; | |
928 | case MM_RSAHOSTKEY: | |
929 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 930 | allowed = options.rhosts_rsa_authentication && |
931 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 932 | cuser, chost, key); |
933 | break; | |
934 | default: | |
1588c277 | 935 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 936 | break; |
937 | } | |
1853d1ef | 938 | } |
3e2f2431 | 939 | if (key != NULL) |
940 | key_free(key); | |
1853d1ef | 941 | |
942 | /* clear temporarily storage (used by verify) */ | |
943 | monitor_reset_key_state(); | |
944 | ||
945 | if (allowed) { | |
946 | /* Save temporarily for comparison in verify */ | |
947 | key_blob = blob; | |
948 | key_bloblen = bloblen; | |
949 | key_blobtype = type; | |
950 | hostbased_cuser = cuser; | |
951 | hostbased_chost = chost; | |
952 | } | |
953 | ||
954 | debug3("%s: key %p is %s", | |
1588c277 | 955 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 956 | |
957 | buffer_clear(m); | |
958 | buffer_put_int(m, allowed); | |
92e15201 | 959 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 960 | |
961 | mm_append_debug(m); | |
962 | ||
963 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
964 | ||
965 | if (type == MM_RSAHOSTKEY) | |
966 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
967 | ||
968 | return (0); | |
969 | } | |
970 | ||
971 | static int | |
972 | monitor_valid_userblob(u_char *data, u_int datalen) | |
973 | { | |
974 | Buffer b; | |
661e45a0 | 975 | char *p; |
1853d1ef | 976 | u_int len; |
977 | int fail = 0; | |
1853d1ef | 978 | |
979 | buffer_init(&b); | |
980 | buffer_append(&b, data, datalen); | |
981 | ||
982 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 983 | p = buffer_ptr(&b); |
984 | len = buffer_len(&b); | |
985 | if ((session_id2 == NULL) || | |
986 | (len < session_id2_len) || | |
987 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
988 | fail++; | |
1853d1ef | 989 | buffer_consume(&b, session_id2_len); |
990 | } else { | |
521d606b | 991 | p = buffer_get_string(&b, &len); |
992 | if ((session_id2 == NULL) || | |
993 | (len != session_id2_len) || | |
994 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 995 | fail++; |
521d606b | 996 | xfree(p); |
1853d1ef | 997 | } |
998 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
999 | fail++; | |
1000 | p = buffer_get_string(&b, NULL); | |
1001 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1002 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1003 | authctxt->user, p); |
1004 | fail++; | |
1005 | } | |
1006 | xfree(p); | |
1007 | buffer_skip_string(&b); | |
1008 | if (datafellows & SSH_BUG_PKAUTH) { | |
1009 | if (!buffer_get_char(&b)) | |
1010 | fail++; | |
1011 | } else { | |
1012 | p = buffer_get_string(&b, NULL); | |
1013 | if (strcmp("publickey", p) != 0) | |
1014 | fail++; | |
1015 | xfree(p); | |
1016 | if (!buffer_get_char(&b)) | |
1017 | fail++; | |
1018 | buffer_skip_string(&b); | |
1019 | } | |
1020 | buffer_skip_string(&b); | |
1021 | if (buffer_len(&b) != 0) | |
1022 | fail++; | |
1023 | buffer_free(&b); | |
1024 | return (fail == 0); | |
1025 | } | |
1026 | ||
1027 | static int | |
661e45a0 | 1028 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1029 | char *chost) | |
1853d1ef | 1030 | { |
1031 | Buffer b; | |
661e45a0 | 1032 | char *p; |
1853d1ef | 1033 | u_int len; |
1034 | int fail = 0; | |
1853d1ef | 1035 | |
1036 | buffer_init(&b); | |
1037 | buffer_append(&b, data, datalen); | |
1038 | ||
521d606b | 1039 | p = buffer_get_string(&b, &len); |
1040 | if ((session_id2 == NULL) || | |
1041 | (len != session_id2_len) || | |
1042 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1043 | fail++; |
521d606b | 1044 | xfree(p); |
1045 | ||
1853d1ef | 1046 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1047 | fail++; | |
1048 | p = buffer_get_string(&b, NULL); | |
1049 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1050 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1051 | authctxt->user, p); |
1052 | fail++; | |
1053 | } | |
1054 | xfree(p); | |
1055 | buffer_skip_string(&b); /* service */ | |
1056 | p = buffer_get_string(&b, NULL); | |
1057 | if (strcmp(p, "hostbased") != 0) | |
1058 | fail++; | |
1059 | xfree(p); | |
1060 | buffer_skip_string(&b); /* pkalg */ | |
1061 | buffer_skip_string(&b); /* pkblob */ | |
1062 | ||
1063 | /* verify client host, strip trailing dot if necessary */ | |
1064 | p = buffer_get_string(&b, NULL); | |
1065 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1066 | p[len - 1] = '\0'; | |
1067 | if (strcmp(p, chost) != 0) | |
1068 | fail++; | |
1069 | xfree(p); | |
1070 | ||
1071 | /* verify client user */ | |
1072 | p = buffer_get_string(&b, NULL); | |
1073 | if (strcmp(p, cuser) != 0) | |
1074 | fail++; | |
1075 | xfree(p); | |
1076 | ||
1077 | if (buffer_len(&b) != 0) | |
1078 | fail++; | |
1079 | buffer_free(&b); | |
1080 | return (fail == 0); | |
1081 | } | |
1082 | ||
1083 | int | |
1084 | mm_answer_keyverify(int socket, Buffer *m) | |
1085 | { | |
1086 | Key *key; | |
1087 | u_char *signature, *data, *blob; | |
1088 | u_int signaturelen, datalen, bloblen; | |
1089 | int verified = 0; | |
1090 | int valid_data = 0; | |
1091 | ||
1092 | blob = buffer_get_string(m, &bloblen); | |
1093 | signature = buffer_get_string(m, &signaturelen); | |
1094 | data = buffer_get_string(m, &datalen); | |
1095 | ||
1096 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1097 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1098 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1099 | |
1100 | key = key_from_blob(blob, bloblen); | |
1101 | if (key == NULL) | |
1588c277 | 1102 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1103 | |
1104 | switch (key_blobtype) { | |
1105 | case MM_USERKEY: | |
1106 | valid_data = monitor_valid_userblob(data, datalen); | |
1107 | break; | |
1108 | case MM_HOSTKEY: | |
1109 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1110 | hostbased_cuser, hostbased_chost); | |
1111 | break; | |
1112 | default: | |
1113 | valid_data = 0; | |
1114 | break; | |
1115 | } | |
1116 | if (!valid_data) | |
1588c277 | 1117 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1118 | |
1119 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1120 | debug3("%s: key %p signature %s", | |
1588c277 | 1121 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1122 | |
1123 | key_free(key); | |
1124 | xfree(blob); | |
1125 | xfree(signature); | |
1126 | xfree(data); | |
1127 | ||
d17ef027 | 1128 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1129 | ||
1853d1ef | 1130 | monitor_reset_key_state(); |
1131 | ||
1132 | buffer_clear(m); | |
1133 | buffer_put_int(m, verified); | |
1134 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1135 | ||
1853d1ef | 1136 | return (verified); |
1137 | } | |
1138 | ||
1139 | static void | |
1140 | mm_record_login(Session *s, struct passwd *pw) | |
1141 | { | |
1142 | socklen_t fromlen; | |
1143 | struct sockaddr_storage from; | |
1144 | ||
1145 | /* | |
1146 | * Get IP address of client. If the connection is not a socket, let | |
1147 | * the address be 0.0.0.0. | |
1148 | */ | |
1149 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1150 | fromlen = sizeof(from); |
1853d1ef | 1151 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1152 | if (getpeername(packet_get_connection_in(), |
1153 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1154 | debug("getpeername: %.100s", strerror(errno)); | |
1155 | fatal_cleanup(); | |
1156 | } | |
1157 | } | |
1158 | /* Record that there was a login on that tty from the remote host. */ | |
1159 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
1160 | get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping), | |
ba1566dd | 1161 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1162 | } |
1163 | ||
1164 | static void | |
1165 | mm_session_close(Session *s) | |
1166 | { | |
b9ed513a | 1167 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1168 | if (s->ttyfd != -1) { |
1588c277 | 1169 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1170 | fatal_remove_cleanup(session_pty_cleanup2, (void *)s); |
1171 | session_pty_cleanup2(s); | |
1172 | } | |
1173 | s->used = 0; | |
1174 | } | |
1175 | ||
1176 | int | |
1177 | mm_answer_pty(int socket, Buffer *m) | |
1178 | { | |
b5a28cbc | 1179 | extern struct monitor *pmonitor; |
1853d1ef | 1180 | Session *s; |
1181 | int res, fd0; | |
1182 | ||
1588c277 | 1183 | debug3("%s entering", __func__); |
1853d1ef | 1184 | |
1185 | buffer_clear(m); | |
1186 | s = session_new(); | |
1187 | if (s == NULL) | |
1188 | goto error; | |
1189 | s->authctxt = authctxt; | |
1190 | s->pw = authctxt->pw; | |
b5a28cbc | 1191 | s->pid = pmonitor->m_pid; |
1853d1ef | 1192 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1193 | if (res == 0) | |
1194 | goto error; | |
1195 | fatal_add_cleanup(session_pty_cleanup2, (void *)s); | |
1196 | pty_setowner(authctxt->pw, s->tty); | |
1197 | ||
1198 | buffer_put_int(m, 1); | |
1199 | buffer_put_cstring(m, s->tty); | |
1200 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1201 | ||
1202 | mm_send_fd(socket, s->ptyfd); | |
1203 | mm_send_fd(socket, s->ttyfd); | |
1204 | ||
1205 | /* We need to trick ttyslot */ | |
1206 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1207 | fatal("%s: dup2", __func__); |
1853d1ef | 1208 | |
1209 | mm_record_login(s, authctxt->pw); | |
1210 | ||
1211 | /* Now we can close the file descriptor again */ | |
1212 | close(0); | |
1213 | ||
1214 | /* make sure nothing uses fd 0 */ | |
1215 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1216 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1217 | if (fd0 != 0) |
1588c277 | 1218 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1219 | |
1220 | /* slave is not needed */ | |
1221 | close(s->ttyfd); | |
1222 | s->ttyfd = s->ptyfd; | |
1223 | /* no need to dup() because nobody closes ptyfd */ | |
1224 | s->ptymaster = s->ptyfd; | |
1225 | ||
1588c277 | 1226 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1227 | |
1228 | return (0); | |
1229 | ||
1230 | error: | |
1231 | if (s != NULL) | |
1232 | mm_session_close(s); | |
1233 | buffer_put_int(m, 0); | |
1234 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1235 | return (0); | |
1236 | } | |
1237 | ||
1238 | int | |
1239 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1240 | { | |
1241 | Session *s; | |
1242 | char *tty; | |
1243 | ||
1588c277 | 1244 | debug3("%s entering", __func__); |
1853d1ef | 1245 | |
1246 | tty = buffer_get_string(m, NULL); | |
1247 | if ((s = session_by_tty(tty)) != NULL) | |
1248 | mm_session_close(s); | |
1249 | buffer_clear(m); | |
1250 | xfree(tty); | |
1251 | return (0); | |
1252 | } | |
1253 | ||
1254 | int | |
1255 | mm_answer_sesskey(int socket, Buffer *m) | |
1256 | { | |
1257 | BIGNUM *p; | |
1258 | int rsafail; | |
1259 | ||
1260 | /* Turn off permissions */ | |
1261 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1262 | ||
1263 | if ((p = BN_new()) == NULL) | |
1588c277 | 1264 | fatal("%s: BN_new", __func__); |
1853d1ef | 1265 | |
1266 | buffer_get_bignum2(m, p); | |
1267 | ||
1268 | rsafail = ssh1_session_key(p); | |
1269 | ||
1270 | buffer_clear(m); | |
1271 | buffer_put_int(m, rsafail); | |
1272 | buffer_put_bignum2(m, p); | |
1273 | ||
1274 | BN_clear_free(p); | |
1275 | ||
1276 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1277 | ||
1278 | /* Turn on permissions for sessid passing */ | |
1279 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1280 | ||
1281 | return (0); | |
1282 | } | |
1283 | ||
1284 | int | |
1285 | mm_answer_sessid(int socket, Buffer *m) | |
1286 | { | |
1287 | int i; | |
1288 | ||
1588c277 | 1289 | debug3("%s entering", __func__); |
1853d1ef | 1290 | |
1291 | if (buffer_len(m) != 16) | |
1588c277 | 1292 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1293 | for (i = 0; i < 16; i++) |
1294 | session_id[i] = buffer_get_char(m); | |
1295 | ||
1296 | /* Turn on permissions for getpwnam */ | |
1297 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1298 | ||
1299 | return (0); | |
1300 | } | |
1301 | ||
1302 | int | |
1303 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1304 | { | |
1305 | BIGNUM *client_n; | |
1306 | Key *key = NULL; | |
1307 | u_char *blob = NULL; | |
1308 | u_int blen = 0; | |
1309 | int allowed = 0; | |
1310 | ||
1588c277 | 1311 | debug3("%s entering", __func__); |
1853d1ef | 1312 | |
aa586f8e | 1313 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1314 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1315 | fatal("%s: BN_new", __func__); |
1853d1ef | 1316 | buffer_get_bignum2(m, client_n); |
1317 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1318 | BN_clear_free(client_n); | |
1319 | } | |
1320 | buffer_clear(m); | |
1321 | buffer_put_int(m, allowed); | |
92e15201 | 1322 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1323 | |
1324 | /* clear temporarily storage (used by generate challenge) */ | |
1325 | monitor_reset_key_state(); | |
1326 | ||
1327 | if (allowed && key != NULL) { | |
1328 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1329 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1330 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1331 | buffer_put_string(m, blob, blen); |
1332 | ||
1333 | /* Save temporarily for comparison in verify */ | |
1334 | key_blob = blob; | |
1335 | key_bloblen = blen; | |
1336 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1337 | } |
3e2f2431 | 1338 | if (key != NULL) |
1339 | key_free(key); | |
1853d1ef | 1340 | |
1341 | mm_append_debug(m); | |
1342 | ||
1343 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1344 | ||
1345 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1346 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1347 | return (0); | |
1348 | } | |
1349 | ||
1350 | int | |
1351 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1352 | { | |
1353 | Key *key = NULL; | |
1354 | u_char *blob; | |
1355 | u_int blen; | |
1356 | ||
1588c277 | 1357 | debug3("%s entering", __func__); |
1853d1ef | 1358 | |
1359 | if (!authctxt->valid) | |
1588c277 | 1360 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1361 | blob = buffer_get_string(m, &blen); |
1362 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1363 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1364 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1365 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1366 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1367 | fatal("%s: received bad key", __func__); |
1853d1ef | 1368 | |
1369 | if (ssh1_challenge) | |
1370 | BN_clear_free(ssh1_challenge); | |
1371 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1372 | ||
1373 | buffer_clear(m); | |
1374 | buffer_put_bignum2(m, ssh1_challenge); | |
1375 | ||
1588c277 | 1376 | debug3("%s sending reply", __func__); |
1853d1ef | 1377 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1378 | ||
1379 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1380 | |
1381 | xfree(blob); | |
1382 | key_free(key); | |
1853d1ef | 1383 | return (0); |
1384 | } | |
1385 | ||
1386 | int | |
1387 | mm_answer_rsa_response(int socket, Buffer *m) | |
1388 | { | |
1389 | Key *key = NULL; | |
1390 | u_char *blob, *response; | |
1391 | u_int blen, len; | |
1392 | int success; | |
1393 | ||
1588c277 | 1394 | debug3("%s entering", __func__); |
1853d1ef | 1395 | |
1396 | if (!authctxt->valid) | |
1588c277 | 1397 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1398 | if (ssh1_challenge == NULL) |
1588c277 | 1399 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1400 | |
1401 | blob = buffer_get_string(m, &blen); | |
1402 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1403 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1404 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1405 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1406 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1407 | fatal("%s: received bad key", __func__); |
1853d1ef | 1408 | response = buffer_get_string(m, &len); |
1409 | if (len != 16) | |
1588c277 | 1410 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1411 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1412 | ||
3e2f2431 | 1413 | xfree(blob); |
1853d1ef | 1414 | key_free(key); |
1415 | xfree(response); | |
1416 | ||
1417 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1418 | ||
1419 | /* reset state */ | |
1420 | BN_clear_free(ssh1_challenge); | |
1421 | ssh1_challenge = NULL; | |
1422 | monitor_reset_key_state(); | |
1423 | ||
1424 | buffer_clear(m); | |
1425 | buffer_put_int(m, success); | |
1426 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1427 | ||
1428 | return (success); | |
1429 | } | |
1430 | ||
2db9d8aa | 1431 | #ifdef KRB4 |
1432 | int | |
1433 | mm_answer_krb4(int socket, Buffer *m) | |
1434 | { | |
1435 | KTEXT_ST auth, reply; | |
1436 | char *client, *p; | |
1437 | int success; | |
1438 | u_int alen; | |
1439 | ||
1440 | reply.length = auth.length = 0; | |
1441 | ||
1442 | p = buffer_get_string(m, &alen); | |
1443 | if (alen >= MAX_KTXT_LEN) | |
1444 | fatal("%s: auth too large", __func__); | |
1445 | memcpy(auth.dat, p, alen); | |
1446 | auth.length = alen; | |
1447 | memset(p, 0, alen); | |
1448 | xfree(p); | |
1449 | ||
1450 | success = options.kerberos_authentication && | |
1451 | authctxt->valid && | |
1452 | auth_krb4(authctxt, &auth, &client, &reply); | |
1453 | ||
1454 | memset(auth.dat, 0, alen); | |
1455 | buffer_clear(m); | |
1456 | buffer_put_int(m, success); | |
1457 | ||
1458 | if (success) { | |
1459 | buffer_put_cstring(m, client); | |
1460 | buffer_put_string(m, reply.dat, reply.length); | |
1461 | if (client) | |
1462 | xfree(client); | |
1463 | if (reply.length) | |
1464 | memset(reply.dat, 0, reply.length); | |
1465 | } | |
1466 | ||
1467 | debug3("%s: sending result %d", __func__, success); | |
1468 | mm_request_send(socket, MONITOR_ANS_KRB4, m); | |
1469 | ||
1470 | auth_method = "kerberos"; | |
1471 | ||
1472 | /* Causes monitor loop to terminate if authenticated */ | |
1473 | return (success); | |
1474 | } | |
1475 | #endif | |
696f6bef | 1476 | |
1477 | #ifdef KRB5 | |
1478 | int | |
1479 | mm_answer_krb5(int socket, Buffer *m) | |
1480 | { | |
1481 | krb5_data tkt, reply; | |
1482 | char *client_user; | |
1483 | u_int len; | |
1484 | int success; | |
1485 | ||
1486 | /* use temporary var to avoid size issues on 64bit arch */ | |
1487 | tkt.data = buffer_get_string(m, &len); | |
1488 | tkt.length = len; | |
1489 | ||
4741e3a6 | 1490 | success = options.kerberos_authentication && |
1491 | authctxt->valid && | |
0082ad34 | 1492 | auth_krb5(authctxt, &tkt, &client_user, &reply); |
696f6bef | 1493 | |
1494 | if (tkt.length) | |
1495 | xfree(tkt.data); | |
1496 | ||
1497 | buffer_clear(m); | |
1498 | buffer_put_int(m, success); | |
1499 | ||
1500 | if (success) { | |
1501 | buffer_put_cstring(m, client_user); | |
1502 | buffer_put_string(m, reply.data, reply.length); | |
1503 | if (client_user) | |
1504 | xfree(client_user); | |
1505 | if (reply.length) | |
1506 | xfree(reply.data); | |
1507 | } | |
1508 | mm_request_send(socket, MONITOR_ANS_KRB5, m); | |
1509 | ||
802e01b8 | 1510 | auth_method = "kerberos"; |
1511 | ||
696f6bef | 1512 | return success; |
1513 | } | |
1514 | #endif | |
1515 | ||
1853d1ef | 1516 | int |
1517 | mm_answer_term(int socket, Buffer *req) | |
1518 | { | |
b5a28cbc | 1519 | extern struct monitor *pmonitor; |
1853d1ef | 1520 | int res, status; |
1521 | ||
1588c277 | 1522 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1523 | |
1524 | /* The child is terminating */ | |
1525 | session_destroy_all(&mm_session_close); | |
1526 | ||
b5a28cbc | 1527 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1528 | if (errno != EINTR) |
1529 | exit(1); | |
1853d1ef | 1530 | |
1531 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1532 | ||
1533 | /* Terminate process */ | |
1534 | exit (res); | |
1535 | } | |
1536 | ||
1537 | void | |
b5a28cbc | 1538 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1539 | { |
1540 | if (compat20) { | |
1541 | set_newkeys(MODE_IN); | |
1542 | set_newkeys(MODE_OUT); | |
1543 | } else { | |
1853d1ef | 1544 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1545 | packet_set_encryption_key(child_state.ssh1key, |
1546 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1547 | xfree(child_state.ssh1key); | |
1853d1ef | 1548 | } |
1549 | ||
9459414c | 1550 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1551 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1552 | xfree(child_state.keyout); | |
1553 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1554 | xfree(child_state.keyin); | |
1555 | ||
1556 | if (!compat20) { | |
1557 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1558 | xfree(child_state.ivout); | |
1559 | packet_set_iv(MODE_IN, child_state.ivin); | |
1560 | xfree(child_state.ivin); | |
1561 | } | |
1562 | ||
1563 | memcpy(&incoming_stream, &child_state.incoming, | |
1564 | sizeof(incoming_stream)); | |
1565 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1566 | sizeof(outgoing_stream)); | |
1567 | ||
1568 | /* Update with new address */ | |
0496cf34 | 1569 | if (options.compression) |
1570 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1571 | |
1572 | /* Network I/O buffers */ | |
1573 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1574 | buffer_clear(&input); | |
1575 | buffer_append(&input, child_state.input, child_state.ilen); | |
1576 | memset(child_state.input, 0, child_state.ilen); | |
1577 | xfree(child_state.input); | |
1578 | ||
1579 | buffer_clear(&output); | |
1580 | buffer_append(&output, child_state.output, child_state.olen); | |
1581 | memset(child_state.output, 0, child_state.olen); | |
1582 | xfree(child_state.output); | |
1583 | } | |
1584 | ||
1585 | static Kex * | |
1586 | mm_get_kex(Buffer *m) | |
1587 | { | |
1588 | Kex *kex; | |
1589 | void *blob; | |
1590 | u_int bloblen; | |
1591 | ||
1592 | kex = xmalloc(sizeof(*kex)); | |
1593 | memset(kex, 0, sizeof(*kex)); | |
1594 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1595 | if ((session_id2 == NULL) || |
1596 | (kex->session_id_len != session_id2_len) || | |
1597 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1598 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1599 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1600 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1601 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1602 | kex->server = 1; |
1603 | kex->hostkey_type = buffer_get_int(m); | |
1604 | kex->kex_type = buffer_get_int(m); | |
1605 | blob = buffer_get_string(m, &bloblen); | |
1606 | buffer_init(&kex->my); | |
1607 | buffer_append(&kex->my, blob, bloblen); | |
1608 | xfree(blob); | |
1609 | blob = buffer_get_string(m, &bloblen); | |
1610 | buffer_init(&kex->peer); | |
1611 | buffer_append(&kex->peer, blob, bloblen); | |
1612 | xfree(blob); | |
1613 | kex->done = 1; | |
1614 | kex->flags = buffer_get_int(m); | |
1615 | kex->client_version_string = buffer_get_string(m, NULL); | |
1616 | kex->server_version_string = buffer_get_string(m, NULL); | |
1617 | kex->load_host_key=&get_hostkey_by_type; | |
1618 | kex->host_key_index=&get_hostkey_index; | |
1619 | ||
1620 | return (kex); | |
1621 | } | |
1622 | ||
1623 | /* This function requries careful sanity checking */ | |
1624 | ||
1625 | void | |
b5a28cbc | 1626 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1627 | { |
1628 | Buffer m; | |
1629 | u_char *blob, *p; | |
1630 | u_int bloblen, plen; | |
ffd7b36b | 1631 | u_int32_t seqnr, packets; |
1632 | u_int64_t blocks; | |
1853d1ef | 1633 | |
1588c277 | 1634 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1635 | |
1636 | buffer_init(&m); | |
b5a28cbc | 1637 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1638 | if (!compat20) { |
1639 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1640 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1641 | child_state.ssh1key = buffer_get_string(&m, |
1642 | &child_state.ssh1keylen); | |
1853d1ef | 1643 | child_state.ivout = buffer_get_string(&m, |
1644 | &child_state.ivoutlen); | |
1645 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1646 | goto skip; | |
1647 | } else { | |
1648 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1649 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1650 | } |
1651 | ||
1652 | blob = buffer_get_string(&m, &bloblen); | |
1653 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1654 | xfree(blob); | |
1655 | ||
1588c277 | 1656 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1657 | blob = buffer_get_string(&m, &bloblen); |
1658 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1659 | xfree(blob); | |
1660 | ||
1661 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1662 | seqnr = buffer_get_int(&m); |
1663 | blocks = buffer_get_int64(&m); | |
1664 | packets = buffer_get_int(&m); | |
1665 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1666 | seqnr = buffer_get_int(&m); | |
1667 | blocks = buffer_get_int64(&m); | |
1668 | packets = buffer_get_int(&m); | |
1669 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1670 | |
1671 | skip: | |
1672 | /* Get the key context */ | |
1673 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1674 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1675 | ||
1588c277 | 1676 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1677 | /* Get compression state */ |
1678 | p = buffer_get_string(&m, &plen); | |
1679 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1680 | fatal("%s: bad request size", __func__); |
1853d1ef | 1681 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1682 | xfree(p); | |
1683 | ||
1684 | p = buffer_get_string(&m, &plen); | |
1685 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1686 | fatal("%s: bad request size", __func__); |
1853d1ef | 1687 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1688 | xfree(p); | |
1689 | ||
1690 | /* Network I/O buffers */ | |
1588c277 | 1691 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1692 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1693 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1694 | ||
1695 | buffer_free(&m); | |
1696 | } | |
1697 | ||
1698 | ||
1699 | /* Allocation functions for zlib */ | |
1700 | void * | |
1701 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1702 | { | |
39e71188 | 1703 | size_t len = (size_t) size * ncount; |
1853d1ef | 1704 | void *address; |
1705 | ||
b85698ab | 1706 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1707 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1708 | ||
1709 | address = mm_malloc(mm, len); | |
1853d1ef | 1710 | |
1711 | return (address); | |
1712 | } | |
1713 | ||
1714 | void | |
1715 | mm_zfree(struct mm_master *mm, void *address) | |
1716 | { | |
1717 | mm_free(mm, address); | |
1718 | } | |
1719 | ||
1720 | void | |
1721 | mm_init_compression(struct mm_master *mm) | |
1722 | { | |
1723 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1724 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1725 | outgoing_stream.opaque = mm; | |
1726 | ||
1727 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1728 | incoming_stream.zfree = (free_func)mm_zfree; | |
1729 | incoming_stream.opaque = mm; | |
1730 | } | |
1731 | ||
1732 | /* XXX */ | |
1733 | ||
1734 | #define FD_CLOSEONEXEC(x) do { \ | |
1735 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1736 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1737 | } while (0) | |
1738 | ||
1739 | static void | |
1740 | monitor_socketpair(int *pair) | |
1741 | { | |
f1af2dbf | 1742 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1743 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1744 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1745 | #else |
1746 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1747 | __func__); |
f1af2dbf | 1748 | #endif |
1853d1ef | 1749 | FD_CLOSEONEXEC(pair[0]); |
1750 | FD_CLOSEONEXEC(pair[1]); | |
1751 | } | |
1752 | ||
1753 | #define MM_MEMSIZE 65536 | |
1754 | ||
1755 | struct monitor * | |
1756 | monitor_init(void) | |
1757 | { | |
1758 | struct monitor *mon; | |
1759 | int pair[2]; | |
1760 | ||
1761 | mon = xmalloc(sizeof(*mon)); | |
1762 | ||
1763 | monitor_socketpair(pair); | |
1764 | ||
1765 | mon->m_recvfd = pair[0]; | |
1766 | mon->m_sendfd = pair[1]; | |
1767 | ||
1768 | /* Used to share zlib space across processes */ | |
0496cf34 | 1769 | if (options.compression) { |
1770 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1771 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1772 | |
0496cf34 | 1773 | /* Compression needs to share state across borders */ |
1774 | mm_init_compression(mon->m_zlib); | |
1775 | } | |
1853d1ef | 1776 | |
1777 | return mon; | |
1778 | } | |
1779 | ||
1780 | void | |
1781 | monitor_reinit(struct monitor *mon) | |
1782 | { | |
1783 | int pair[2]; | |
1784 | ||
1785 | monitor_socketpair(pair); | |
1786 | ||
1787 | mon->m_recvfd = pair[0]; | |
1788 | mon->m_sendfd = pair[1]; | |
1789 | } |