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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" | |
8f73f7bb | 28 | RCSID("$OpenBSD: monitor.c,v 1.49 2003/08/28 12:54:34 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 | ||
7364bd04 | 62 | #ifdef GSSAPI |
63 | #include "ssh-gss.h" | |
64 | static Gssctxt *gsscontext = NULL; | |
65 | #endif | |
66 | ||
1853d1ef | 67 | /* Imports */ |
68 | extern ServerOptions options; | |
69 | extern u_int utmp_len; | |
70 | extern Newkeys *current_keys[]; | |
71 | extern z_stream incoming_stream; | |
72 | extern z_stream outgoing_stream; | |
73 | extern u_char session_id[]; | |
74 | extern Buffer input, output; | |
75 | extern Buffer auth_debug; | |
76 | extern int auth_debug_init; | |
77 | ||
78 | /* State exported from the child */ | |
79 | ||
80 | struct { | |
81 | z_stream incoming; | |
82 | z_stream outgoing; | |
83 | u_char *keyin; | |
84 | u_int keyinlen; | |
85 | u_char *keyout; | |
86 | u_int keyoutlen; | |
87 | u_char *ivin; | |
88 | u_int ivinlen; | |
89 | u_char *ivout; | |
90 | u_int ivoutlen; | |
9459414c | 91 | u_char *ssh1key; |
92 | u_int ssh1keylen; | |
1853d1ef | 93 | int ssh1cipher; |
94 | int ssh1protoflags; | |
95 | u_char *input; | |
96 | u_int ilen; | |
97 | u_char *output; | |
98 | u_int olen; | |
99 | } child_state; | |
100 | ||
b8e04133 | 101 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 102 | |
103 | int mm_answer_moduli(int, Buffer *); | |
104 | int mm_answer_sign(int, Buffer *); | |
105 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 106 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 107 | int mm_answer_authserv(int, Buffer *); |
108 | int mm_answer_authpassword(int, Buffer *); | |
109 | int mm_answer_bsdauthquery(int, Buffer *); | |
110 | int mm_answer_bsdauthrespond(int, Buffer *); | |
111 | int mm_answer_skeyquery(int, Buffer *); | |
112 | int mm_answer_skeyrespond(int, Buffer *); | |
113 | int mm_answer_keyallowed(int, Buffer *); | |
114 | int mm_answer_keyverify(int, Buffer *); | |
115 | int mm_answer_pty(int, Buffer *); | |
116 | int mm_answer_pty_cleanup(int, Buffer *); | |
117 | int mm_answer_term(int, Buffer *); | |
118 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
119 | int mm_answer_rsa_challenge(int, Buffer *); | |
120 | int mm_answer_rsa_response(int, Buffer *); | |
121 | int mm_answer_sesskey(int, Buffer *); | |
122 | int mm_answer_sessid(int, Buffer *); | |
123 | ||
ad200abb | 124 | #ifdef USE_PAM |
125 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 126 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 127 | int mm_answer_pam_init_ctx(int, Buffer *); |
128 | int mm_answer_pam_query(int, Buffer *); | |
129 | int mm_answer_pam_respond(int, Buffer *); | |
130 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 131 | #endif |
132 | ||
7364bd04 | 133 | #ifdef GSSAPI |
134 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
135 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
136 | int mm_answer_gss_userok(int, Buffer *); | |
137 | #endif | |
696f6bef | 138 | |
1853d1ef | 139 | static Authctxt *authctxt; |
140 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
141 | ||
142 | /* local state for key verify */ | |
143 | static u_char *key_blob = NULL; | |
144 | static u_int key_bloblen = 0; | |
145 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 146 | static char *hostbased_cuser = NULL; |
147 | static char *hostbased_chost = NULL; | |
1853d1ef | 148 | static char *auth_method = "unknown"; |
a27002e5 | 149 | static u_int session_id2_len = 0; |
521d606b | 150 | static u_char *session_id2 = NULL; |
3a39206f | 151 | static pid_t monitor_child_pid; |
1853d1ef | 152 | |
153 | struct mon_table { | |
154 | enum monitor_reqtype type; | |
155 | int flags; | |
156 | int (*f)(int, Buffer *); | |
157 | }; | |
158 | ||
159 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
160 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
161 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
162 | ||
163 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
164 | ||
165 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
166 | ||
167 | struct mon_table mon_dispatch_proto20[] = { | |
168 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
169 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
170 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
171 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 172 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 173 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 174 | #ifdef USE_PAM |
175 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 176 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 177 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
178 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
179 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
180 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 181 | #endif |
1853d1ef | 182 | #ifdef BSD_AUTH |
183 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
184 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
185 | #endif | |
186 | #ifdef SKEY | |
187 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
188 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
189 | #endif | |
190 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
191 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 192 | #ifdef GSSAPI |
193 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
194 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
195 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
802e01b8 | 196 | #endif |
1853d1ef | 197 | {0, 0, NULL} |
198 | }; | |
199 | ||
200 | struct mon_table mon_dispatch_postauth20[] = { | |
201 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
202 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
203 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
204 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
205 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
206 | {0, 0, NULL} | |
207 | }; | |
208 | ||
209 | struct mon_table mon_dispatch_proto15[] = { | |
210 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
211 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
212 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
213 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
214 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
215 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
216 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
217 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
218 | #ifdef BSD_AUTH | |
219 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
220 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
221 | #endif | |
222 | #ifdef SKEY | |
223 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
224 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 225 | #endif |
226 | #ifdef USE_PAM | |
227 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 228 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 229 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
230 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
231 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
232 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
1853d1ef | 233 | #endif |
234 | {0, 0, NULL} | |
235 | }; | |
236 | ||
237 | struct mon_table mon_dispatch_postauth15[] = { | |
238 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
239 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
240 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
241 | {0, 0, NULL} | |
242 | }; | |
243 | ||
244 | struct mon_table *mon_dispatch; | |
245 | ||
246 | /* Specifies if a certain message is allowed at the moment */ | |
247 | ||
248 | static void | |
249 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
250 | { | |
251 | while (ent->f != NULL) { | |
252 | if (ent->type == type) { | |
253 | ent->flags &= ~MON_PERMIT; | |
254 | ent->flags |= permit ? MON_PERMIT : 0; | |
255 | return; | |
256 | } | |
257 | ent++; | |
258 | } | |
259 | } | |
260 | ||
261 | static void | |
262 | monitor_permit_authentications(int permit) | |
263 | { | |
264 | struct mon_table *ent = mon_dispatch; | |
265 | ||
266 | while (ent->f != NULL) { | |
267 | if (ent->flags & MON_AUTH) { | |
268 | ent->flags &= ~MON_PERMIT; | |
269 | ent->flags |= permit ? MON_PERMIT : 0; | |
270 | } | |
271 | ent++; | |
272 | } | |
273 | } | |
274 | ||
275 | Authctxt * | |
b5a28cbc | 276 | monitor_child_preauth(struct monitor *pmonitor) |
1853d1ef | 277 | { |
278 | struct mon_table *ent; | |
279 | int authenticated = 0; | |
280 | ||
281 | debug3("preauth child monitor started"); | |
282 | ||
283 | if (compat20) { | |
284 | mon_dispatch = mon_dispatch_proto20; | |
285 | ||
286 | /* Permit requests for moduli and signatures */ | |
287 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
288 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
289 | } else { | |
290 | mon_dispatch = mon_dispatch_proto15; | |
291 | ||
292 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
293 | } | |
294 | ||
295 | authctxt = authctxt_new(); | |
296 | ||
297 | /* The first few requests do not require asynchronous access */ | |
298 | while (!authenticated) { | |
b5a28cbc | 299 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 300 | if (authenticated) { |
301 | if (!(ent->flags & MON_AUTHDECIDE)) | |
302 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 303 | __func__, ent->type); |
1853d1ef | 304 | if (authctxt->pw->pw_uid == 0 && |
305 | !auth_root_allowed(auth_method)) | |
306 | authenticated = 0; | |
5b9e2464 | 307 | #ifdef USE_PAM |
308 | /* PAM needs to perform account checks after auth */ | |
309 | if (options.use_pam) { | |
310 | Buffer m; | |
311 | ||
312 | buffer_init(&m); | |
313 | mm_request_receive_expect(pmonitor->m_sendfd, | |
314 | MONITOR_REQ_PAM_ACCOUNT, &m); | |
315 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
316 | buffer_free(&m); | |
317 | } | |
318 | #endif | |
1853d1ef | 319 | } |
320 | ||
321 | if (ent->flags & MON_AUTHDECIDE) { | |
322 | auth_log(authctxt, authenticated, auth_method, | |
323 | compat20 ? " ssh2" : ""); | |
324 | if (!authenticated) | |
325 | authctxt->failures++; | |
326 | } | |
327 | } | |
328 | ||
329 | if (!authctxt->valid) | |
1588c277 | 330 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 331 | |
332 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 333 | __func__, authctxt->user); |
1853d1ef | 334 | |
b5a28cbc | 335 | mm_get_keystate(pmonitor); |
1853d1ef | 336 | |
337 | return (authctxt); | |
338 | } | |
339 | ||
3a39206f | 340 | static void |
341 | monitor_set_child_handler(pid_t pid) | |
342 | { | |
343 | monitor_child_pid = pid; | |
344 | } | |
345 | ||
346 | static void | |
347 | monitor_child_handler(int signal) | |
348 | { | |
349 | kill(monitor_child_pid, signal); | |
350 | } | |
351 | ||
1853d1ef | 352 | void |
b5a28cbc | 353 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 354 | { |
3a39206f | 355 | monitor_set_child_handler(pmonitor->m_pid); |
356 | signal(SIGHUP, &monitor_child_handler); | |
357 | signal(SIGTERM, &monitor_child_handler); | |
358 | ||
1853d1ef | 359 | if (compat20) { |
360 | mon_dispatch = mon_dispatch_postauth20; | |
361 | ||
362 | /* Permit requests for moduli and signatures */ | |
363 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
364 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
365 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 366 | } else { |
367 | mon_dispatch = mon_dispatch_postauth15; | |
368 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
369 | } | |
370 | if (!no_pty_flag) { | |
371 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
372 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
373 | } | |
374 | ||
375 | for (;;) | |
b5a28cbc | 376 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 377 | } |
378 | ||
379 | void | |
b5a28cbc | 380 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 381 | { |
0496cf34 | 382 | if (options.compression) { |
383 | /* The member allocation is not visible, so sync it */ | |
384 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
385 | } | |
1853d1ef | 386 | } |
387 | ||
388 | int | |
b5a28cbc | 389 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 390 | struct mon_table **pent) |
391 | { | |
392 | Buffer m; | |
393 | int ret; | |
394 | u_char type; | |
395 | ||
396 | buffer_init(&m); | |
397 | ||
b5a28cbc | 398 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 399 | type = buffer_get_char(&m); |
400 | ||
1588c277 | 401 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 402 | |
403 | while (ent->f != NULL) { | |
404 | if (ent->type == type) | |
405 | break; | |
406 | ent++; | |
407 | } | |
408 | ||
409 | if (ent->f != NULL) { | |
410 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 411 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 412 | type); |
b5a28cbc | 413 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 414 | buffer_free(&m); |
415 | ||
416 | /* The child may use this request only once, disable it */ | |
417 | if (ent->flags & MON_ONCE) { | |
1588c277 | 418 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 419 | type); |
420 | ent->flags &= ~MON_PERMIT; | |
421 | } | |
422 | ||
423 | if (pent != NULL) | |
424 | *pent = ent; | |
425 | ||
426 | return ret; | |
427 | } | |
428 | ||
1588c277 | 429 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 430 | |
431 | /* NOTREACHED */ | |
432 | return (-1); | |
433 | } | |
434 | ||
435 | /* allowed key state */ | |
436 | static int | |
437 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
438 | { | |
439 | /* make sure key is allowed */ | |
440 | if (key_blob == NULL || key_bloblen != bloblen || | |
441 | memcmp(key_blob, blob, key_bloblen)) | |
442 | return (0); | |
443 | return (1); | |
444 | } | |
445 | ||
446 | static void | |
447 | monitor_reset_key_state(void) | |
448 | { | |
449 | /* reset state */ | |
450 | if (key_blob != NULL) | |
451 | xfree(key_blob); | |
452 | if (hostbased_cuser != NULL) | |
453 | xfree(hostbased_cuser); | |
454 | if (hostbased_chost != NULL) | |
455 | xfree(hostbased_chost); | |
456 | key_blob = NULL; | |
457 | key_bloblen = 0; | |
458 | key_blobtype = MM_NOKEY; | |
459 | hostbased_cuser = NULL; | |
460 | hostbased_chost = NULL; | |
461 | } | |
462 | ||
463 | int | |
464 | mm_answer_moduli(int socket, Buffer *m) | |
465 | { | |
466 | DH *dh; | |
467 | int min, want, max; | |
468 | ||
469 | min = buffer_get_int(m); | |
470 | want = buffer_get_int(m); | |
471 | max = buffer_get_int(m); | |
472 | ||
473 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 474 | __func__, min, want, max); |
1853d1ef | 475 | /* We need to check here, too, in case the child got corrupted */ |
476 | if (max < min || want < min || max < want) | |
477 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 478 | __func__, min, want, max); |
1853d1ef | 479 | |
480 | buffer_clear(m); | |
481 | ||
482 | dh = choose_dh(min, want, max); | |
483 | if (dh == NULL) { | |
484 | buffer_put_char(m, 0); | |
485 | return (0); | |
486 | } else { | |
487 | /* Send first bignum */ | |
488 | buffer_put_char(m, 1); | |
489 | buffer_put_bignum2(m, dh->p); | |
490 | buffer_put_bignum2(m, dh->g); | |
491 | ||
492 | DH_free(dh); | |
493 | } | |
494 | mm_request_send(socket, MONITOR_ANS_MODULI, m); | |
495 | return (0); | |
496 | } | |
497 | ||
498 | int | |
499 | mm_answer_sign(int socket, Buffer *m) | |
500 | { | |
501 | Key *key; | |
502 | u_char *p; | |
503 | u_char *signature; | |
504 | u_int siglen, datlen; | |
505 | int keyid; | |
506 | ||
1588c277 | 507 | debug3("%s", __func__); |
1853d1ef | 508 | |
509 | keyid = buffer_get_int(m); | |
510 | p = buffer_get_string(m, &datlen); | |
511 | ||
512 | if (datlen != 20) | |
d1ff09ba | 513 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 514 | |
521d606b | 515 | /* save session id, it will be passed on the first call */ |
516 | if (session_id2_len == 0) { | |
517 | session_id2_len = datlen; | |
518 | session_id2 = xmalloc(session_id2_len); | |
519 | memcpy(session_id2, p, session_id2_len); | |
520 | } | |
521 | ||
1853d1ef | 522 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 523 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 524 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 525 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 526 | |
d1ff09ba | 527 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 528 | |
529 | buffer_clear(m); | |
530 | buffer_put_string(m, signature, siglen); | |
531 | ||
532 | xfree(p); | |
533 | xfree(signature); | |
534 | ||
535 | mm_request_send(socket, MONITOR_ANS_SIGN, m); | |
536 | ||
537 | /* Turn on permissions for getpwnam */ | |
538 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
539 | ||
540 | return (0); | |
541 | } | |
542 | ||
543 | /* Retrieves the password entry and also checks if the user is permitted */ | |
544 | ||
545 | int | |
546 | mm_answer_pwnamallow(int socket, Buffer *m) | |
547 | { | |
548 | char *login; | |
549 | struct passwd *pwent; | |
550 | int allowed = 0; | |
551 | ||
1588c277 | 552 | debug3("%s", __func__); |
1853d1ef | 553 | |
554 | if (authctxt->attempt++ != 0) | |
1588c277 | 555 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 556 | |
557 | login = buffer_get_string(m, NULL); | |
558 | ||
559 | pwent = getpwnamallow(login); | |
560 | ||
561 | authctxt->user = xstrdup(login); | |
562 | setproctitle("%s [priv]", pwent ? login : "unknown"); | |
563 | xfree(login); | |
564 | ||
565 | buffer_clear(m); | |
566 | ||
567 | if (pwent == NULL) { | |
568 | buffer_put_char(m, 0); | |
569 | goto out; | |
570 | } | |
571 | ||
572 | allowed = 1; | |
573 | authctxt->pw = pwent; | |
574 | authctxt->valid = 1; | |
575 | ||
576 | buffer_put_char(m, 1); | |
577 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
578 | buffer_put_cstring(m, pwent->pw_name); | |
579 | buffer_put_cstring(m, "*"); | |
580 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 581 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 582 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 583 | #endif |
1853d1ef | 584 | buffer_put_cstring(m, pwent->pw_dir); |
585 | buffer_put_cstring(m, pwent->pw_shell); | |
586 | ||
587 | out: | |
1588c277 | 588 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
1853d1ef | 589 | mm_request_send(socket, MONITOR_ANS_PWNAM, m); |
590 | ||
591 | /* For SSHv1 allow authentication now */ | |
592 | if (!compat20) | |
593 | monitor_permit_authentications(1); | |
94a73cdc | 594 | else { |
1853d1ef | 595 | /* Allow service/style information on the auth context */ |
596 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 597 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
598 | } | |
1853d1ef | 599 | |
efe44db6 | 600 | #ifdef USE_PAM |
7fceb20d | 601 | if (options.use_pam) |
602 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 603 | #endif |
1853d1ef | 604 | |
605 | return (0); | |
606 | } | |
607 | ||
94a73cdc | 608 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
609 | { | |
610 | char *banner; | |
611 | ||
612 | buffer_clear(m); | |
613 | banner = auth2_read_banner(); | |
614 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
615 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
616 | ||
617 | if (banner != NULL) | |
30e37ee6 | 618 | xfree(banner); |
94a73cdc | 619 | |
620 | return (0); | |
621 | } | |
622 | ||
1853d1ef | 623 | int |
624 | mm_answer_authserv(int socket, Buffer *m) | |
625 | { | |
626 | monitor_permit_authentications(1); | |
627 | ||
628 | authctxt->service = buffer_get_string(m, NULL); | |
629 | authctxt->style = buffer_get_string(m, NULL); | |
630 | debug3("%s: service=%s, style=%s", | |
1588c277 | 631 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 632 | |
633 | if (strlen(authctxt->style) == 0) { | |
634 | xfree(authctxt->style); | |
635 | authctxt->style = NULL; | |
636 | } | |
637 | ||
638 | return (0); | |
639 | } | |
640 | ||
641 | int | |
642 | mm_answer_authpassword(int socket, Buffer *m) | |
643 | { | |
644 | static int call_count; | |
645 | char *passwd; | |
d341742a | 646 | int authenticated; |
647 | u_int plen; | |
1853d1ef | 648 | |
649 | passwd = buffer_get_string(m, &plen); | |
650 | /* Only authenticate if the context is valid */ | |
aa586f8e | 651 | authenticated = options.password_authentication && |
68ece370 | 652 | auth_password(authctxt, passwd) && authctxt->valid; |
1853d1ef | 653 | memset(passwd, 0, strlen(passwd)); |
654 | xfree(passwd); | |
655 | ||
656 | buffer_clear(m); | |
657 | buffer_put_int(m, authenticated); | |
658 | ||
1588c277 | 659 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 660 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
661 | ||
662 | call_count++; | |
663 | if (plen == 0 && call_count == 1) | |
664 | auth_method = "none"; | |
665 | else | |
666 | auth_method = "password"; | |
667 | ||
668 | /* Causes monitor loop to terminate if authenticated */ | |
669 | return (authenticated); | |
670 | } | |
671 | ||
672 | #ifdef BSD_AUTH | |
673 | int | |
674 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
675 | { | |
676 | char *name, *infotxt; | |
677 | u_int numprompts; | |
678 | u_int *echo_on; | |
679 | char **prompts; | |
6d6c25e3 | 680 | u_int success; |
1853d1ef | 681 | |
6d6c25e3 | 682 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
683 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 684 | |
685 | buffer_clear(m); | |
6d6c25e3 | 686 | buffer_put_int(m, success); |
687 | if (success) | |
1853d1ef | 688 | buffer_put_cstring(m, prompts[0]); |
689 | ||
6d6c25e3 | 690 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 691 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
692 | ||
6d6c25e3 | 693 | if (success) { |
1853d1ef | 694 | xfree(name); |
695 | xfree(infotxt); | |
696 | xfree(prompts); | |
697 | xfree(echo_on); | |
698 | } | |
699 | ||
700 | return (0); | |
701 | } | |
702 | ||
703 | int | |
704 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
705 | { | |
706 | char *response; | |
707 | int authok; | |
708 | ||
709 | if (authctxt->as == 0) | |
1588c277 | 710 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 711 | |
712 | response = buffer_get_string(m, NULL); | |
aa586f8e | 713 | authok = options.challenge_response_authentication && |
714 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 715 | authctxt->as = NULL; |
1588c277 | 716 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 717 | xfree(response); |
718 | ||
719 | buffer_clear(m); | |
720 | buffer_put_int(m, authok); | |
721 | ||
1588c277 | 722 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 723 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
724 | ||
725 | auth_method = "bsdauth"; | |
726 | ||
727 | return (authok != 0); | |
728 | } | |
729 | #endif | |
730 | ||
731 | #ifdef SKEY | |
732 | int | |
733 | mm_answer_skeyquery(int socket, Buffer *m) | |
734 | { | |
735 | struct skey skey; | |
736 | char challenge[1024]; | |
6d6c25e3 | 737 | u_int success; |
1853d1ef | 738 | |
6d6c25e3 | 739 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 740 | |
741 | buffer_clear(m); | |
6d6c25e3 | 742 | buffer_put_int(m, success); |
743 | if (success) | |
1853d1ef | 744 | buffer_put_cstring(m, challenge); |
745 | ||
6d6c25e3 | 746 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 747 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
748 | ||
749 | return (0); | |
750 | } | |
751 | ||
752 | int | |
753 | mm_answer_skeyrespond(int socket, Buffer *m) | |
754 | { | |
755 | char *response; | |
756 | int authok; | |
757 | ||
758 | response = buffer_get_string(m, NULL); | |
759 | ||
aa586f8e | 760 | authok = (options.challenge_response_authentication && |
761 | authctxt->valid && | |
1853d1ef | 762 | skey_haskey(authctxt->pw->pw_name) == 0 && |
763 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
764 | ||
765 | xfree(response); | |
766 | ||
767 | buffer_clear(m); | |
768 | buffer_put_int(m, authok); | |
769 | ||
1588c277 | 770 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 771 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
772 | ||
773 | auth_method = "skey"; | |
774 | ||
775 | return (authok != 0); | |
776 | } | |
777 | #endif | |
778 | ||
ad200abb | 779 | #ifdef USE_PAM |
780 | int | |
781 | mm_answer_pam_start(int socket, Buffer *m) | |
782 | { | |
783 | char *user; | |
784 | ||
7fceb20d | 785 | if (!options.use_pam) |
786 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
787 | ||
ad200abb | 788 | user = buffer_get_string(m, NULL); |
789 | ||
790 | start_pam(user); | |
791 | ||
792 | xfree(user); | |
793 | ||
5b9e2464 | 794 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
795 | ||
ad200abb | 796 | return (0); |
797 | } | |
05114c74 | 798 | |
5b9e2464 | 799 | int |
800 | mm_answer_pam_account(int socket, Buffer *m) | |
801 | { | |
802 | u_int ret; | |
803 | ||
804 | if (!options.use_pam) | |
805 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
806 | ||
807 | ret = do_pam_account(); | |
808 | ||
809 | buffer_put_int(m, ret); | |
810 | ||
811 | mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m); | |
812 | ||
813 | return (ret); | |
814 | } | |
815 | ||
05114c74 | 816 | static void *sshpam_ctxt, *sshpam_authok; |
817 | extern KbdintDevice sshpam_device; | |
818 | ||
819 | int | |
820 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
821 | { | |
822 | ||
823 | debug3("%s", __func__); | |
824 | authctxt->user = buffer_get_string(m, NULL); | |
825 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
826 | sshpam_authok = NULL; | |
827 | buffer_clear(m); | |
828 | if (sshpam_ctxt != NULL) { | |
829 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
830 | buffer_put_int(m, 1); | |
831 | } else { | |
832 | buffer_put_int(m, 0); | |
833 | } | |
834 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
835 | return (0); | |
836 | } | |
837 | ||
838 | int | |
839 | mm_answer_pam_query(int socket, Buffer *m) | |
840 | { | |
841 | char *name, *info, **prompts; | |
842 | u_int num, *echo_on; | |
843 | int i, ret; | |
844 | ||
845 | debug3("%s", __func__); | |
846 | sshpam_authok = NULL; | |
847 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
848 | if (ret == 0 && num == 0) | |
849 | sshpam_authok = sshpam_ctxt; | |
850 | if (num > 1 || name == NULL || info == NULL) | |
851 | ret = -1; | |
852 | buffer_clear(m); | |
853 | buffer_put_int(m, ret); | |
854 | buffer_put_cstring(m, name); | |
855 | xfree(name); | |
856 | buffer_put_cstring(m, info); | |
857 | xfree(info); | |
858 | buffer_put_int(m, num); | |
859 | for (i = 0; i < num; ++i) { | |
860 | buffer_put_cstring(m, prompts[i]); | |
861 | xfree(prompts[i]); | |
862 | buffer_put_int(m, echo_on[i]); | |
863 | } | |
864 | if (prompts != NULL) | |
865 | xfree(prompts); | |
866 | if (echo_on != NULL) | |
867 | xfree(echo_on); | |
868 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
869 | return (0); | |
870 | } | |
871 | ||
872 | int | |
873 | mm_answer_pam_respond(int socket, Buffer *m) | |
874 | { | |
875 | char **resp; | |
876 | u_int num; | |
877 | int i, ret; | |
878 | ||
879 | debug3("%s", __func__); | |
880 | sshpam_authok = NULL; | |
881 | num = buffer_get_int(m); | |
882 | if (num > 0) { | |
883 | resp = xmalloc(num * sizeof(char *)); | |
884 | for (i = 0; i < num; ++i) | |
885 | resp[i] = buffer_get_string(m, NULL); | |
886 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
887 | for (i = 0; i < num; ++i) | |
888 | xfree(resp[i]); | |
889 | xfree(resp); | |
890 | } else { | |
891 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
892 | } | |
893 | buffer_clear(m); | |
894 | buffer_put_int(m, ret); | |
895 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
896 | auth_method = "keyboard-interactive/pam"; | |
897 | if (ret == 0) | |
898 | sshpam_authok = sshpam_ctxt; | |
899 | return (0); | |
900 | } | |
901 | ||
902 | int | |
903 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
904 | { | |
905 | ||
906 | debug3("%s", __func__); | |
907 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
908 | buffer_clear(m); | |
909 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
910 | return (sshpam_authok == sshpam_ctxt); | |
911 | } | |
ad200abb | 912 | #endif |
913 | ||
1853d1ef | 914 | static void |
915 | mm_append_debug(Buffer *m) | |
916 | { | |
917 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 918 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 919 | buffer_append(m, buffer_ptr(&auth_debug), |
920 | buffer_len(&auth_debug)); | |
921 | buffer_clear(&auth_debug); | |
922 | } | |
923 | } | |
924 | ||
925 | int | |
926 | mm_answer_keyallowed(int socket, Buffer *m) | |
927 | { | |
928 | Key *key; | |
661e45a0 | 929 | char *cuser, *chost; |
930 | u_char *blob; | |
1853d1ef | 931 | u_int bloblen; |
932 | enum mm_keytype type = 0; | |
933 | int allowed = 0; | |
934 | ||
1588c277 | 935 | debug3("%s entering", __func__); |
1853d1ef | 936 | |
937 | type = buffer_get_int(m); | |
938 | cuser = buffer_get_string(m, NULL); | |
939 | chost = buffer_get_string(m, NULL); | |
940 | blob = buffer_get_string(m, &bloblen); | |
941 | ||
942 | key = key_from_blob(blob, bloblen); | |
943 | ||
944 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
945 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 946 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 947 | |
1588c277 | 948 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 949 | |
950 | if (key != NULL && authctxt->pw != NULL) { | |
951 | switch(type) { | |
952 | case MM_USERKEY: | |
aa586f8e | 953 | allowed = options.pubkey_authentication && |
954 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 955 | break; |
956 | case MM_HOSTKEY: | |
aa586f8e | 957 | allowed = options.hostbased_authentication && |
958 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 959 | cuser, chost, key); |
960 | break; | |
961 | case MM_RSAHOSTKEY: | |
962 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 963 | allowed = options.rhosts_rsa_authentication && |
964 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 965 | cuser, chost, key); |
966 | break; | |
967 | default: | |
1588c277 | 968 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 969 | break; |
970 | } | |
1853d1ef | 971 | } |
3e2f2431 | 972 | if (key != NULL) |
973 | key_free(key); | |
1853d1ef | 974 | |
975 | /* clear temporarily storage (used by verify) */ | |
976 | monitor_reset_key_state(); | |
977 | ||
978 | if (allowed) { | |
979 | /* Save temporarily for comparison in verify */ | |
980 | key_blob = blob; | |
981 | key_bloblen = bloblen; | |
982 | key_blobtype = type; | |
983 | hostbased_cuser = cuser; | |
984 | hostbased_chost = chost; | |
985 | } | |
986 | ||
987 | debug3("%s: key %p is %s", | |
1588c277 | 988 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 989 | |
990 | buffer_clear(m); | |
991 | buffer_put_int(m, allowed); | |
92e15201 | 992 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 993 | |
994 | mm_append_debug(m); | |
995 | ||
996 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
997 | ||
998 | if (type == MM_RSAHOSTKEY) | |
999 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1000 | ||
1001 | return (0); | |
1002 | } | |
1003 | ||
1004 | static int | |
1005 | monitor_valid_userblob(u_char *data, u_int datalen) | |
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 | ||
1015 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1016 | p = buffer_ptr(&b); |
1017 | len = buffer_len(&b); | |
1018 | if ((session_id2 == NULL) || | |
1019 | (len < session_id2_len) || | |
1020 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1021 | fail++; | |
1853d1ef | 1022 | buffer_consume(&b, session_id2_len); |
1023 | } else { | |
521d606b | 1024 | p = buffer_get_string(&b, &len); |
1025 | if ((session_id2 == NULL) || | |
1026 | (len != session_id2_len) || | |
1027 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1028 | fail++; |
521d606b | 1029 | xfree(p); |
1853d1ef | 1030 | } |
1031 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1032 | fail++; | |
1033 | p = buffer_get_string(&b, NULL); | |
1034 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1035 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1036 | authctxt->user, p); |
1037 | fail++; | |
1038 | } | |
1039 | xfree(p); | |
1040 | buffer_skip_string(&b); | |
1041 | if (datafellows & SSH_BUG_PKAUTH) { | |
1042 | if (!buffer_get_char(&b)) | |
1043 | fail++; | |
1044 | } else { | |
1045 | p = buffer_get_string(&b, NULL); | |
1046 | if (strcmp("publickey", p) != 0) | |
1047 | fail++; | |
1048 | xfree(p); | |
1049 | if (!buffer_get_char(&b)) | |
1050 | fail++; | |
1051 | buffer_skip_string(&b); | |
1052 | } | |
1053 | buffer_skip_string(&b); | |
1054 | if (buffer_len(&b) != 0) | |
1055 | fail++; | |
1056 | buffer_free(&b); | |
1057 | return (fail == 0); | |
1058 | } | |
1059 | ||
1060 | static int | |
661e45a0 | 1061 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1062 | char *chost) | |
1853d1ef | 1063 | { |
1064 | Buffer b; | |
661e45a0 | 1065 | char *p; |
1853d1ef | 1066 | u_int len; |
1067 | int fail = 0; | |
1853d1ef | 1068 | |
1069 | buffer_init(&b); | |
1070 | buffer_append(&b, data, datalen); | |
1071 | ||
521d606b | 1072 | p = buffer_get_string(&b, &len); |
1073 | if ((session_id2 == NULL) || | |
1074 | (len != session_id2_len) || | |
1075 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1076 | fail++; |
521d606b | 1077 | xfree(p); |
1078 | ||
1853d1ef | 1079 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1080 | fail++; | |
1081 | p = buffer_get_string(&b, NULL); | |
1082 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1083 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1084 | authctxt->user, p); |
1085 | fail++; | |
1086 | } | |
1087 | xfree(p); | |
1088 | buffer_skip_string(&b); /* service */ | |
1089 | p = buffer_get_string(&b, NULL); | |
1090 | if (strcmp(p, "hostbased") != 0) | |
1091 | fail++; | |
1092 | xfree(p); | |
1093 | buffer_skip_string(&b); /* pkalg */ | |
1094 | buffer_skip_string(&b); /* pkblob */ | |
1095 | ||
1096 | /* verify client host, strip trailing dot if necessary */ | |
1097 | p = buffer_get_string(&b, NULL); | |
1098 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1099 | p[len - 1] = '\0'; | |
1100 | if (strcmp(p, chost) != 0) | |
1101 | fail++; | |
1102 | xfree(p); | |
1103 | ||
1104 | /* verify client user */ | |
1105 | p = buffer_get_string(&b, NULL); | |
1106 | if (strcmp(p, cuser) != 0) | |
1107 | fail++; | |
1108 | xfree(p); | |
1109 | ||
1110 | if (buffer_len(&b) != 0) | |
1111 | fail++; | |
1112 | buffer_free(&b); | |
1113 | return (fail == 0); | |
1114 | } | |
1115 | ||
1116 | int | |
1117 | mm_answer_keyverify(int socket, Buffer *m) | |
1118 | { | |
1119 | Key *key; | |
1120 | u_char *signature, *data, *blob; | |
1121 | u_int signaturelen, datalen, bloblen; | |
1122 | int verified = 0; | |
1123 | int valid_data = 0; | |
1124 | ||
1125 | blob = buffer_get_string(m, &bloblen); | |
1126 | signature = buffer_get_string(m, &signaturelen); | |
1127 | data = buffer_get_string(m, &datalen); | |
1128 | ||
1129 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1130 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1131 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1132 | |
1133 | key = key_from_blob(blob, bloblen); | |
1134 | if (key == NULL) | |
1588c277 | 1135 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1136 | |
1137 | switch (key_blobtype) { | |
1138 | case MM_USERKEY: | |
1139 | valid_data = monitor_valid_userblob(data, datalen); | |
1140 | break; | |
1141 | case MM_HOSTKEY: | |
1142 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1143 | hostbased_cuser, hostbased_chost); | |
1144 | break; | |
1145 | default: | |
1146 | valid_data = 0; | |
1147 | break; | |
1148 | } | |
1149 | if (!valid_data) | |
1588c277 | 1150 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1151 | |
1152 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1153 | debug3("%s: key %p signature %s", | |
1588c277 | 1154 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1155 | |
1156 | key_free(key); | |
1157 | xfree(blob); | |
1158 | xfree(signature); | |
1159 | xfree(data); | |
1160 | ||
d17ef027 | 1161 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1162 | ||
1853d1ef | 1163 | monitor_reset_key_state(); |
1164 | ||
1165 | buffer_clear(m); | |
1166 | buffer_put_int(m, verified); | |
1167 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1168 | ||
1853d1ef | 1169 | return (verified); |
1170 | } | |
1171 | ||
1172 | static void | |
1173 | mm_record_login(Session *s, struct passwd *pw) | |
1174 | { | |
1175 | socklen_t fromlen; | |
1176 | struct sockaddr_storage from; | |
1177 | ||
1178 | /* | |
1179 | * Get IP address of client. If the connection is not a socket, let | |
1180 | * the address be 0.0.0.0. | |
1181 | */ | |
1182 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1183 | fromlen = sizeof(from); |
1853d1ef | 1184 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1185 | if (getpeername(packet_get_connection_in(), |
1186 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1187 | debug("getpeername: %.100s", strerror(errno)); | |
1188 | fatal_cleanup(); | |
1189 | } | |
1190 | } | |
1191 | /* Record that there was a login on that tty from the remote host. */ | |
1192 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1193 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1194 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1195 | } |
1196 | ||
1197 | static void | |
1198 | mm_session_close(Session *s) | |
1199 | { | |
b9ed513a | 1200 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1201 | if (s->ttyfd != -1) { |
1588c277 | 1202 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1203 | fatal_remove_cleanup(session_pty_cleanup2, (void *)s); |
1204 | session_pty_cleanup2(s); | |
1205 | } | |
1206 | s->used = 0; | |
1207 | } | |
1208 | ||
1209 | int | |
1210 | mm_answer_pty(int socket, Buffer *m) | |
1211 | { | |
b5a28cbc | 1212 | extern struct monitor *pmonitor; |
1853d1ef | 1213 | Session *s; |
1214 | int res, fd0; | |
1215 | ||
1588c277 | 1216 | debug3("%s entering", __func__); |
1853d1ef | 1217 | |
1218 | buffer_clear(m); | |
1219 | s = session_new(); | |
1220 | if (s == NULL) | |
1221 | goto error; | |
1222 | s->authctxt = authctxt; | |
1223 | s->pw = authctxt->pw; | |
b5a28cbc | 1224 | s->pid = pmonitor->m_pid; |
1853d1ef | 1225 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1226 | if (res == 0) | |
1227 | goto error; | |
1228 | fatal_add_cleanup(session_pty_cleanup2, (void *)s); | |
1229 | pty_setowner(authctxt->pw, s->tty); | |
1230 | ||
1231 | buffer_put_int(m, 1); | |
1232 | buffer_put_cstring(m, s->tty); | |
1233 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1234 | ||
1235 | mm_send_fd(socket, s->ptyfd); | |
1236 | mm_send_fd(socket, s->ttyfd); | |
1237 | ||
1238 | /* We need to trick ttyslot */ | |
1239 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1240 | fatal("%s: dup2", __func__); |
1853d1ef | 1241 | |
1242 | mm_record_login(s, authctxt->pw); | |
1243 | ||
1244 | /* Now we can close the file descriptor again */ | |
1245 | close(0); | |
1246 | ||
1247 | /* make sure nothing uses fd 0 */ | |
1248 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1249 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1250 | if (fd0 != 0) |
1588c277 | 1251 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1252 | |
1253 | /* slave is not needed */ | |
1254 | close(s->ttyfd); | |
1255 | s->ttyfd = s->ptyfd; | |
1256 | /* no need to dup() because nobody closes ptyfd */ | |
1257 | s->ptymaster = s->ptyfd; | |
1258 | ||
1588c277 | 1259 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1260 | |
1261 | return (0); | |
1262 | ||
1263 | error: | |
1264 | if (s != NULL) | |
1265 | mm_session_close(s); | |
1266 | buffer_put_int(m, 0); | |
1267 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1268 | return (0); | |
1269 | } | |
1270 | ||
1271 | int | |
1272 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1273 | { | |
1274 | Session *s; | |
1275 | char *tty; | |
1276 | ||
1588c277 | 1277 | debug3("%s entering", __func__); |
1853d1ef | 1278 | |
1279 | tty = buffer_get_string(m, NULL); | |
1280 | if ((s = session_by_tty(tty)) != NULL) | |
1281 | mm_session_close(s); | |
1282 | buffer_clear(m); | |
1283 | xfree(tty); | |
1284 | return (0); | |
1285 | } | |
1286 | ||
1287 | int | |
1288 | mm_answer_sesskey(int socket, Buffer *m) | |
1289 | { | |
1290 | BIGNUM *p; | |
1291 | int rsafail; | |
1292 | ||
1293 | /* Turn off permissions */ | |
1294 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1295 | ||
1296 | if ((p = BN_new()) == NULL) | |
1588c277 | 1297 | fatal("%s: BN_new", __func__); |
1853d1ef | 1298 | |
1299 | buffer_get_bignum2(m, p); | |
1300 | ||
1301 | rsafail = ssh1_session_key(p); | |
1302 | ||
1303 | buffer_clear(m); | |
1304 | buffer_put_int(m, rsafail); | |
1305 | buffer_put_bignum2(m, p); | |
1306 | ||
1307 | BN_clear_free(p); | |
1308 | ||
1309 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1310 | ||
1311 | /* Turn on permissions for sessid passing */ | |
1312 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1313 | ||
1314 | return (0); | |
1315 | } | |
1316 | ||
1317 | int | |
1318 | mm_answer_sessid(int socket, Buffer *m) | |
1319 | { | |
1320 | int i; | |
1321 | ||
1588c277 | 1322 | debug3("%s entering", __func__); |
1853d1ef | 1323 | |
1324 | if (buffer_len(m) != 16) | |
1588c277 | 1325 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1326 | for (i = 0; i < 16; i++) |
1327 | session_id[i] = buffer_get_char(m); | |
1328 | ||
1329 | /* Turn on permissions for getpwnam */ | |
1330 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1331 | ||
1332 | return (0); | |
1333 | } | |
1334 | ||
1335 | int | |
1336 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1337 | { | |
1338 | BIGNUM *client_n; | |
1339 | Key *key = NULL; | |
1340 | u_char *blob = NULL; | |
1341 | u_int blen = 0; | |
1342 | int allowed = 0; | |
1343 | ||
1588c277 | 1344 | debug3("%s entering", __func__); |
1853d1ef | 1345 | |
aa586f8e | 1346 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1347 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1348 | fatal("%s: BN_new", __func__); |
1853d1ef | 1349 | buffer_get_bignum2(m, client_n); |
1350 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1351 | BN_clear_free(client_n); | |
1352 | } | |
1353 | buffer_clear(m); | |
1354 | buffer_put_int(m, allowed); | |
92e15201 | 1355 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1356 | |
1357 | /* clear temporarily storage (used by generate challenge) */ | |
1358 | monitor_reset_key_state(); | |
1359 | ||
1360 | if (allowed && key != NULL) { | |
1361 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1362 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1363 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1364 | buffer_put_string(m, blob, blen); |
1365 | ||
1366 | /* Save temporarily for comparison in verify */ | |
1367 | key_blob = blob; | |
1368 | key_bloblen = blen; | |
1369 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1370 | } |
3e2f2431 | 1371 | if (key != NULL) |
1372 | key_free(key); | |
1853d1ef | 1373 | |
1374 | mm_append_debug(m); | |
1375 | ||
1376 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1377 | ||
1378 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1379 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1380 | return (0); | |
1381 | } | |
1382 | ||
1383 | int | |
1384 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1385 | { | |
1386 | Key *key = NULL; | |
1387 | u_char *blob; | |
1388 | u_int blen; | |
1389 | ||
1588c277 | 1390 | debug3("%s entering", __func__); |
1853d1ef | 1391 | |
1392 | if (!authctxt->valid) | |
1588c277 | 1393 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1394 | blob = buffer_get_string(m, &blen); |
1395 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1396 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1397 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1398 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1399 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1400 | fatal("%s: received bad key", __func__); |
1853d1ef | 1401 | |
1402 | if (ssh1_challenge) | |
1403 | BN_clear_free(ssh1_challenge); | |
1404 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1405 | ||
1406 | buffer_clear(m); | |
1407 | buffer_put_bignum2(m, ssh1_challenge); | |
1408 | ||
1588c277 | 1409 | debug3("%s sending reply", __func__); |
1853d1ef | 1410 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1411 | ||
1412 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1413 | |
1414 | xfree(blob); | |
1415 | key_free(key); | |
1853d1ef | 1416 | return (0); |
1417 | } | |
1418 | ||
1419 | int | |
1420 | mm_answer_rsa_response(int socket, Buffer *m) | |
1421 | { | |
1422 | Key *key = NULL; | |
1423 | u_char *blob, *response; | |
1424 | u_int blen, len; | |
1425 | int success; | |
1426 | ||
1588c277 | 1427 | debug3("%s entering", __func__); |
1853d1ef | 1428 | |
1429 | if (!authctxt->valid) | |
1588c277 | 1430 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1431 | if (ssh1_challenge == NULL) |
1588c277 | 1432 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1433 | |
1434 | blob = buffer_get_string(m, &blen); | |
1435 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1436 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1437 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1438 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1439 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1440 | fatal("%s: received bad key", __func__); |
1853d1ef | 1441 | response = buffer_get_string(m, &len); |
1442 | if (len != 16) | |
1588c277 | 1443 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1444 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1445 | ||
3e2f2431 | 1446 | xfree(blob); |
1853d1ef | 1447 | key_free(key); |
1448 | xfree(response); | |
1449 | ||
1450 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1451 | ||
1452 | /* reset state */ | |
1453 | BN_clear_free(ssh1_challenge); | |
1454 | ssh1_challenge = NULL; | |
1455 | monitor_reset_key_state(); | |
1456 | ||
1457 | buffer_clear(m); | |
1458 | buffer_put_int(m, success); | |
1459 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1460 | ||
1461 | return (success); | |
1462 | } | |
1463 | ||
1464 | int | |
1465 | mm_answer_term(int socket, Buffer *req) | |
1466 | { | |
b5a28cbc | 1467 | extern struct monitor *pmonitor; |
1853d1ef | 1468 | int res, status; |
1469 | ||
1588c277 | 1470 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1471 | |
1472 | /* The child is terminating */ | |
1473 | session_destroy_all(&mm_session_close); | |
1474 | ||
b5a28cbc | 1475 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1476 | if (errno != EINTR) |
1477 | exit(1); | |
1853d1ef | 1478 | |
1479 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1480 | ||
1481 | /* Terminate process */ | |
1482 | exit (res); | |
1483 | } | |
1484 | ||
1485 | void | |
b5a28cbc | 1486 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1487 | { |
1488 | if (compat20) { | |
1489 | set_newkeys(MODE_IN); | |
1490 | set_newkeys(MODE_OUT); | |
1491 | } else { | |
1853d1ef | 1492 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1493 | packet_set_encryption_key(child_state.ssh1key, |
1494 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1495 | xfree(child_state.ssh1key); | |
1853d1ef | 1496 | } |
1497 | ||
9459414c | 1498 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1499 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1500 | xfree(child_state.keyout); | |
1501 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1502 | xfree(child_state.keyin); | |
1503 | ||
1504 | if (!compat20) { | |
1505 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1506 | xfree(child_state.ivout); | |
1507 | packet_set_iv(MODE_IN, child_state.ivin); | |
1508 | xfree(child_state.ivin); | |
1509 | } | |
1510 | ||
1511 | memcpy(&incoming_stream, &child_state.incoming, | |
1512 | sizeof(incoming_stream)); | |
1513 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1514 | sizeof(outgoing_stream)); | |
1515 | ||
1516 | /* Update with new address */ | |
0496cf34 | 1517 | if (options.compression) |
1518 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1519 | |
1520 | /* Network I/O buffers */ | |
1521 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1522 | buffer_clear(&input); | |
1523 | buffer_append(&input, child_state.input, child_state.ilen); | |
1524 | memset(child_state.input, 0, child_state.ilen); | |
1525 | xfree(child_state.input); | |
1526 | ||
1527 | buffer_clear(&output); | |
1528 | buffer_append(&output, child_state.output, child_state.olen); | |
1529 | memset(child_state.output, 0, child_state.olen); | |
1530 | xfree(child_state.output); | |
1531 | } | |
1532 | ||
1533 | static Kex * | |
1534 | mm_get_kex(Buffer *m) | |
1535 | { | |
1536 | Kex *kex; | |
1537 | void *blob; | |
1538 | u_int bloblen; | |
1539 | ||
1540 | kex = xmalloc(sizeof(*kex)); | |
1541 | memset(kex, 0, sizeof(*kex)); | |
1542 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1543 | if ((session_id2 == NULL) || |
1544 | (kex->session_id_len != session_id2_len) || | |
1545 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1546 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1547 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1548 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1549 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1550 | kex->server = 1; |
1551 | kex->hostkey_type = buffer_get_int(m); | |
1552 | kex->kex_type = buffer_get_int(m); | |
1553 | blob = buffer_get_string(m, &bloblen); | |
1554 | buffer_init(&kex->my); | |
1555 | buffer_append(&kex->my, blob, bloblen); | |
1556 | xfree(blob); | |
1557 | blob = buffer_get_string(m, &bloblen); | |
1558 | buffer_init(&kex->peer); | |
1559 | buffer_append(&kex->peer, blob, bloblen); | |
1560 | xfree(blob); | |
1561 | kex->done = 1; | |
1562 | kex->flags = buffer_get_int(m); | |
1563 | kex->client_version_string = buffer_get_string(m, NULL); | |
1564 | kex->server_version_string = buffer_get_string(m, NULL); | |
1565 | kex->load_host_key=&get_hostkey_by_type; | |
1566 | kex->host_key_index=&get_hostkey_index; | |
1567 | ||
1568 | return (kex); | |
1569 | } | |
1570 | ||
1571 | /* This function requries careful sanity checking */ | |
1572 | ||
1573 | void | |
b5a28cbc | 1574 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1575 | { |
1576 | Buffer m; | |
1577 | u_char *blob, *p; | |
1578 | u_int bloblen, plen; | |
ffd7b36b | 1579 | u_int32_t seqnr, packets; |
1580 | u_int64_t blocks; | |
1853d1ef | 1581 | |
1588c277 | 1582 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1583 | |
1584 | buffer_init(&m); | |
b5a28cbc | 1585 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1586 | if (!compat20) { |
1587 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1588 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1589 | child_state.ssh1key = buffer_get_string(&m, |
1590 | &child_state.ssh1keylen); | |
1853d1ef | 1591 | child_state.ivout = buffer_get_string(&m, |
1592 | &child_state.ivoutlen); | |
1593 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1594 | goto skip; | |
1595 | } else { | |
1596 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1597 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1598 | } |
1599 | ||
1600 | blob = buffer_get_string(&m, &bloblen); | |
1601 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1602 | xfree(blob); | |
1603 | ||
1588c277 | 1604 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1605 | blob = buffer_get_string(&m, &bloblen); |
1606 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1607 | xfree(blob); | |
1608 | ||
1609 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1610 | seqnr = buffer_get_int(&m); |
1611 | blocks = buffer_get_int64(&m); | |
1612 | packets = buffer_get_int(&m); | |
1613 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1614 | seqnr = buffer_get_int(&m); | |
1615 | blocks = buffer_get_int64(&m); | |
1616 | packets = buffer_get_int(&m); | |
1617 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1618 | |
1619 | skip: | |
1620 | /* Get the key context */ | |
1621 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1622 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1623 | ||
1588c277 | 1624 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1625 | /* Get compression state */ |
1626 | p = buffer_get_string(&m, &plen); | |
1627 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1628 | fatal("%s: bad request size", __func__); |
1853d1ef | 1629 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1630 | xfree(p); | |
1631 | ||
1632 | p = buffer_get_string(&m, &plen); | |
1633 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1634 | fatal("%s: bad request size", __func__); |
1853d1ef | 1635 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1636 | xfree(p); | |
1637 | ||
1638 | /* Network I/O buffers */ | |
1588c277 | 1639 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1640 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1641 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1642 | ||
1643 | buffer_free(&m); | |
1644 | } | |
1645 | ||
1646 | ||
1647 | /* Allocation functions for zlib */ | |
1648 | void * | |
1649 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1650 | { | |
39e71188 | 1651 | size_t len = (size_t) size * ncount; |
1853d1ef | 1652 | void *address; |
1653 | ||
b85698ab | 1654 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1655 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1656 | ||
1657 | address = mm_malloc(mm, len); | |
1853d1ef | 1658 | |
1659 | return (address); | |
1660 | } | |
1661 | ||
1662 | void | |
1663 | mm_zfree(struct mm_master *mm, void *address) | |
1664 | { | |
1665 | mm_free(mm, address); | |
1666 | } | |
1667 | ||
1668 | void | |
1669 | mm_init_compression(struct mm_master *mm) | |
1670 | { | |
1671 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1672 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1673 | outgoing_stream.opaque = mm; | |
1674 | ||
1675 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1676 | incoming_stream.zfree = (free_func)mm_zfree; | |
1677 | incoming_stream.opaque = mm; | |
1678 | } | |
1679 | ||
1680 | /* XXX */ | |
1681 | ||
1682 | #define FD_CLOSEONEXEC(x) do { \ | |
1683 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1684 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1685 | } while (0) | |
1686 | ||
1687 | static void | |
1688 | monitor_socketpair(int *pair) | |
1689 | { | |
f1af2dbf | 1690 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1691 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1692 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1693 | #else |
1694 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1695 | __func__); |
f1af2dbf | 1696 | #endif |
1853d1ef | 1697 | FD_CLOSEONEXEC(pair[0]); |
1698 | FD_CLOSEONEXEC(pair[1]); | |
1699 | } | |
1700 | ||
1701 | #define MM_MEMSIZE 65536 | |
1702 | ||
1703 | struct monitor * | |
1704 | monitor_init(void) | |
1705 | { | |
1706 | struct monitor *mon; | |
1707 | int pair[2]; | |
1708 | ||
1709 | mon = xmalloc(sizeof(*mon)); | |
1710 | ||
1711 | monitor_socketpair(pair); | |
1712 | ||
1713 | mon->m_recvfd = pair[0]; | |
1714 | mon->m_sendfd = pair[1]; | |
1715 | ||
1716 | /* Used to share zlib space across processes */ | |
0496cf34 | 1717 | if (options.compression) { |
1718 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1719 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1720 | |
0496cf34 | 1721 | /* Compression needs to share state across borders */ |
1722 | mm_init_compression(mon->m_zlib); | |
1723 | } | |
1853d1ef | 1724 | |
1725 | return mon; | |
1726 | } | |
1727 | ||
1728 | void | |
1729 | monitor_reinit(struct monitor *mon) | |
1730 | { | |
1731 | int pair[2]; | |
1732 | ||
1733 | monitor_socketpair(pair); | |
1734 | ||
1735 | mon->m_recvfd = pair[0]; | |
1736 | mon->m_sendfd = pair[1]; | |
1737 | } | |
7364bd04 | 1738 | |
1739 | #ifdef GSSAPI | |
1740 | int | |
1741 | mm_answer_gss_setup_ctx(int socket, Buffer *m) | |
1742 | { | |
1743 | gss_OID_desc oid; | |
1744 | OM_uint32 major; | |
1745 | u_int len; | |
1746 | ||
1747 | oid.elements = buffer_get_string(m, &len); | |
1748 | oid.length = len; | |
1749 | ||
1750 | major = ssh_gssapi_server_ctx(&gsscontext, &oid); | |
1751 | ||
1752 | xfree(oid.elements); | |
1753 | ||
1754 | buffer_clear(m); | |
1755 | buffer_put_int(m, major); | |
1756 | ||
1757 | mm_request_send(socket,MONITOR_ANS_GSSSETUP, m); | |
1758 | ||
1759 | /* Now we have a context, enable the step */ | |
1760 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1761 | ||
1762 | return (0); | |
1763 | } | |
1764 | ||
1765 | int | |
1766 | mm_answer_gss_accept_ctx(int socket, Buffer *m) | |
1767 | { | |
1768 | gss_buffer_desc in; | |
1769 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1770 | OM_uint32 major,minor; | |
1771 | OM_uint32 flags = 0; /* GSI needs this */ | |
f99e1ca4 | 1772 | u_int len; |
7364bd04 | 1773 | |
f99e1ca4 | 1774 | in.value = buffer_get_string(m, &len); |
1775 | in.length = len; | |
7364bd04 | 1776 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1777 | xfree(in.value); | |
1778 | ||
1779 | buffer_clear(m); | |
1780 | buffer_put_int(m, major); | |
1781 | buffer_put_string(m, out.value, out.length); | |
1782 | buffer_put_int(m, flags); | |
1783 | mm_request_send(socket, MONITOR_ANS_GSSSTEP, m); | |
1784 | ||
1785 | gss_release_buffer(&minor, &out); | |
1786 | ||
1787 | /* Complete - now we can do signing */ | |
1788 | if (major==GSS_S_COMPLETE) { | |
1789 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); | |
1790 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1791 | } | |
1792 | return (0); | |
1793 | } | |
1794 | ||
1795 | int | |
1796 | mm_answer_gss_userok(int socket, Buffer *m) | |
1797 | { | |
1798 | int authenticated; | |
1799 | ||
1800 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1801 | ||
1802 | buffer_clear(m); | |
1803 | buffer_put_int(m, authenticated); | |
1804 | ||
1805 | debug3("%s: sending result %d", __func__, authenticated); | |
1806 | mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m); | |
1807 | ||
1808 | auth_method="gssapi"; | |
1809 | ||
1810 | /* Monitor loop will terminate if authenticated */ | |
1811 | return (authenticated); | |
1812 | } | |
1813 | #endif /* GSSAPI */ |