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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" | |
a9b33b95 | 28 | RCSID("$OpenBSD: monitor.c,v 1.55 2004/02/05 05:37:17 dtucker 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 *); | |
0789992b | 137 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 138 | #endif |
696f6bef | 139 | |
1853d1ef | 140 | static Authctxt *authctxt; |
141 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
142 | ||
143 | /* local state for key verify */ | |
144 | static u_char *key_blob = NULL; | |
145 | static u_int key_bloblen = 0; | |
146 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 147 | static char *hostbased_cuser = NULL; |
148 | static char *hostbased_chost = NULL; | |
1853d1ef | 149 | static char *auth_method = "unknown"; |
a27002e5 | 150 | static u_int session_id2_len = 0; |
521d606b | 151 | static u_char *session_id2 = NULL; |
3a39206f | 152 | static pid_t monitor_child_pid; |
1853d1ef | 153 | |
154 | struct mon_table { | |
155 | enum monitor_reqtype type; | |
156 | int flags; | |
157 | int (*f)(int, Buffer *); | |
158 | }; | |
159 | ||
160 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
161 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
162 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
163 | ||
164 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
165 | ||
166 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
167 | ||
168 | struct mon_table mon_dispatch_proto20[] = { | |
169 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
170 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
171 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
172 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 173 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 174 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 175 | #ifdef USE_PAM |
176 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 177 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 178 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
179 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
180 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
181 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 182 | #endif |
1853d1ef | 183 | #ifdef BSD_AUTH |
184 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
185 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
186 | #endif | |
187 | #ifdef SKEY | |
188 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
189 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
190 | #endif | |
191 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
192 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 193 | #ifdef GSSAPI |
194 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
195 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
196 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 197 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 198 | #endif |
1853d1ef | 199 | {0, 0, NULL} |
200 | }; | |
201 | ||
202 | struct mon_table mon_dispatch_postauth20[] = { | |
203 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
204 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
205 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
206 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
207 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
208 | {0, 0, NULL} | |
209 | }; | |
210 | ||
211 | struct mon_table mon_dispatch_proto15[] = { | |
212 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
213 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
214 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
215 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
216 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
217 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
218 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
219 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
220 | #ifdef BSD_AUTH | |
221 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
222 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
223 | #endif | |
224 | #ifdef SKEY | |
225 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
226 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 227 | #endif |
228 | #ifdef USE_PAM | |
229 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 230 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 231 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
232 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
233 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
234 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
1853d1ef | 235 | #endif |
236 | {0, 0, NULL} | |
237 | }; | |
238 | ||
239 | struct mon_table mon_dispatch_postauth15[] = { | |
240 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
241 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
242 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
243 | {0, 0, NULL} | |
244 | }; | |
245 | ||
246 | struct mon_table *mon_dispatch; | |
247 | ||
248 | /* Specifies if a certain message is allowed at the moment */ | |
249 | ||
250 | static void | |
251 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
252 | { | |
253 | while (ent->f != NULL) { | |
254 | if (ent->type == type) { | |
255 | ent->flags &= ~MON_PERMIT; | |
256 | ent->flags |= permit ? MON_PERMIT : 0; | |
257 | return; | |
258 | } | |
259 | ent++; | |
260 | } | |
261 | } | |
262 | ||
263 | static void | |
264 | monitor_permit_authentications(int permit) | |
265 | { | |
266 | struct mon_table *ent = mon_dispatch; | |
267 | ||
268 | while (ent->f != NULL) { | |
269 | if (ent->flags & MON_AUTH) { | |
270 | ent->flags &= ~MON_PERMIT; | |
271 | ent->flags |= permit ? MON_PERMIT : 0; | |
272 | } | |
273 | ent++; | |
274 | } | |
275 | } | |
276 | ||
2362db19 | 277 | void |
278 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 279 | { |
280 | struct mon_table *ent; | |
281 | int authenticated = 0; | |
282 | ||
283 | debug3("preauth child monitor started"); | |
284 | ||
2362db19 | 285 | authctxt = _authctxt; |
286 | memset(authctxt, 0, sizeof(*authctxt)); | |
287 | ||
1853d1ef | 288 | if (compat20) { |
289 | mon_dispatch = mon_dispatch_proto20; | |
290 | ||
291 | /* Permit requests for moduli and signatures */ | |
292 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
293 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
294 | } else { | |
295 | mon_dispatch = mon_dispatch_proto15; | |
296 | ||
297 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
298 | } | |
299 | ||
1853d1ef | 300 | /* The first few requests do not require asynchronous access */ |
301 | while (!authenticated) { | |
b5a28cbc | 302 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 303 | if (authenticated) { |
304 | if (!(ent->flags & MON_AUTHDECIDE)) | |
305 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 306 | __func__, ent->type); |
1853d1ef | 307 | if (authctxt->pw->pw_uid == 0 && |
308 | !auth_root_allowed(auth_method)) | |
309 | authenticated = 0; | |
5b9e2464 | 310 | #ifdef USE_PAM |
311 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 312 | if (options.use_pam && authenticated) { |
5b9e2464 | 313 | Buffer m; |
314 | ||
315 | buffer_init(&m); | |
aff51935 | 316 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 317 | MONITOR_REQ_PAM_ACCOUNT, &m); |
318 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
319 | buffer_free(&m); | |
320 | } | |
321 | #endif | |
1853d1ef | 322 | } |
323 | ||
324 | if (ent->flags & MON_AUTHDECIDE) { | |
325 | auth_log(authctxt, authenticated, auth_method, | |
326 | compat20 ? " ssh2" : ""); | |
327 | if (!authenticated) | |
328 | authctxt->failures++; | |
329 | } | |
330 | } | |
331 | ||
332 | if (!authctxt->valid) | |
1588c277 | 333 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 334 | |
335 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 336 | __func__, authctxt->user); |
1853d1ef | 337 | |
b5a28cbc | 338 | mm_get_keystate(pmonitor); |
1853d1ef | 339 | } |
340 | ||
3a39206f | 341 | static void |
342 | monitor_set_child_handler(pid_t pid) | |
343 | { | |
344 | monitor_child_pid = pid; | |
345 | } | |
346 | ||
347 | static void | |
348 | monitor_child_handler(int signal) | |
349 | { | |
350 | kill(monitor_child_pid, signal); | |
351 | } | |
352 | ||
1853d1ef | 353 | void |
b5a28cbc | 354 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 355 | { |
3a39206f | 356 | monitor_set_child_handler(pmonitor->m_pid); |
357 | signal(SIGHUP, &monitor_child_handler); | |
358 | signal(SIGTERM, &monitor_child_handler); | |
359 | ||
1853d1ef | 360 | if (compat20) { |
361 | mon_dispatch = mon_dispatch_postauth20; | |
362 | ||
363 | /* Permit requests for moduli and signatures */ | |
364 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
365 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
366 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 367 | } else { |
368 | mon_dispatch = mon_dispatch_postauth15; | |
369 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
370 | } | |
371 | if (!no_pty_flag) { | |
372 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
373 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
374 | } | |
375 | ||
376 | for (;;) | |
b5a28cbc | 377 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 378 | } |
379 | ||
380 | void | |
b5a28cbc | 381 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 382 | { |
0496cf34 | 383 | if (options.compression) { |
384 | /* The member allocation is not visible, so sync it */ | |
385 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
386 | } | |
1853d1ef | 387 | } |
388 | ||
389 | int | |
b5a28cbc | 390 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 391 | struct mon_table **pent) |
392 | { | |
393 | Buffer m; | |
394 | int ret; | |
395 | u_char type; | |
396 | ||
397 | buffer_init(&m); | |
398 | ||
b5a28cbc | 399 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 400 | type = buffer_get_char(&m); |
401 | ||
1588c277 | 402 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 403 | |
404 | while (ent->f != NULL) { | |
405 | if (ent->type == type) | |
406 | break; | |
407 | ent++; | |
408 | } | |
409 | ||
410 | if (ent->f != NULL) { | |
411 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 412 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 413 | type); |
b5a28cbc | 414 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 415 | buffer_free(&m); |
416 | ||
417 | /* The child may use this request only once, disable it */ | |
418 | if (ent->flags & MON_ONCE) { | |
1588c277 | 419 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 420 | type); |
421 | ent->flags &= ~MON_PERMIT; | |
422 | } | |
423 | ||
424 | if (pent != NULL) | |
425 | *pent = ent; | |
426 | ||
427 | return ret; | |
428 | } | |
429 | ||
1588c277 | 430 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 431 | |
432 | /* NOTREACHED */ | |
433 | return (-1); | |
434 | } | |
435 | ||
436 | /* allowed key state */ | |
437 | static int | |
438 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
439 | { | |
440 | /* make sure key is allowed */ | |
441 | if (key_blob == NULL || key_bloblen != bloblen || | |
442 | memcmp(key_blob, blob, key_bloblen)) | |
443 | return (0); | |
444 | return (1); | |
445 | } | |
446 | ||
447 | static void | |
448 | monitor_reset_key_state(void) | |
449 | { | |
450 | /* reset state */ | |
451 | if (key_blob != NULL) | |
452 | xfree(key_blob); | |
453 | if (hostbased_cuser != NULL) | |
454 | xfree(hostbased_cuser); | |
455 | if (hostbased_chost != NULL) | |
456 | xfree(hostbased_chost); | |
457 | key_blob = NULL; | |
458 | key_bloblen = 0; | |
459 | key_blobtype = MM_NOKEY; | |
460 | hostbased_cuser = NULL; | |
461 | hostbased_chost = NULL; | |
462 | } | |
463 | ||
464 | int | |
465 | mm_answer_moduli(int socket, Buffer *m) | |
466 | { | |
467 | DH *dh; | |
468 | int min, want, max; | |
469 | ||
470 | min = buffer_get_int(m); | |
471 | want = buffer_get_int(m); | |
472 | max = buffer_get_int(m); | |
473 | ||
474 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 475 | __func__, min, want, max); |
1853d1ef | 476 | /* We need to check here, too, in case the child got corrupted */ |
477 | if (max < min || want < min || max < want) | |
478 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 479 | __func__, min, want, max); |
1853d1ef | 480 | |
481 | buffer_clear(m); | |
482 | ||
483 | dh = choose_dh(min, want, max); | |
484 | if (dh == NULL) { | |
485 | buffer_put_char(m, 0); | |
486 | return (0); | |
487 | } else { | |
488 | /* Send first bignum */ | |
489 | buffer_put_char(m, 1); | |
490 | buffer_put_bignum2(m, dh->p); | |
491 | buffer_put_bignum2(m, dh->g); | |
492 | ||
493 | DH_free(dh); | |
494 | } | |
495 | mm_request_send(socket, MONITOR_ANS_MODULI, m); | |
496 | return (0); | |
497 | } | |
498 | ||
499 | int | |
500 | mm_answer_sign(int socket, Buffer *m) | |
501 | { | |
502 | Key *key; | |
503 | u_char *p; | |
504 | u_char *signature; | |
505 | u_int siglen, datlen; | |
506 | int keyid; | |
507 | ||
1588c277 | 508 | debug3("%s", __func__); |
1853d1ef | 509 | |
510 | keyid = buffer_get_int(m); | |
511 | p = buffer_get_string(m, &datlen); | |
512 | ||
513 | if (datlen != 20) | |
d1ff09ba | 514 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 515 | |
521d606b | 516 | /* save session id, it will be passed on the first call */ |
517 | if (session_id2_len == 0) { | |
518 | session_id2_len = datlen; | |
519 | session_id2 = xmalloc(session_id2_len); | |
520 | memcpy(session_id2, p, session_id2_len); | |
521 | } | |
522 | ||
1853d1ef | 523 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 524 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 525 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 526 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 527 | |
d1ff09ba | 528 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 529 | |
530 | buffer_clear(m); | |
531 | buffer_put_string(m, signature, siglen); | |
532 | ||
533 | xfree(p); | |
534 | xfree(signature); | |
535 | ||
536 | mm_request_send(socket, MONITOR_ANS_SIGN, m); | |
537 | ||
538 | /* Turn on permissions for getpwnam */ | |
539 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
540 | ||
541 | return (0); | |
542 | } | |
543 | ||
544 | /* Retrieves the password entry and also checks if the user is permitted */ | |
545 | ||
546 | int | |
547 | mm_answer_pwnamallow(int socket, Buffer *m) | |
548 | { | |
549 | char *login; | |
550 | struct passwd *pwent; | |
551 | int allowed = 0; | |
552 | ||
1588c277 | 553 | debug3("%s", __func__); |
1853d1ef | 554 | |
555 | if (authctxt->attempt++ != 0) | |
1588c277 | 556 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 557 | |
558 | login = buffer_get_string(m, NULL); | |
559 | ||
560 | pwent = getpwnamallow(login); | |
561 | ||
562 | authctxt->user = xstrdup(login); | |
563 | setproctitle("%s [priv]", pwent ? login : "unknown"); | |
564 | xfree(login); | |
565 | ||
566 | buffer_clear(m); | |
567 | ||
568 | if (pwent == NULL) { | |
569 | buffer_put_char(m, 0); | |
b2a5802b | 570 | authctxt->pw = fakepw(); |
1853d1ef | 571 | goto out; |
572 | } | |
573 | ||
574 | allowed = 1; | |
575 | authctxt->pw = pwent; | |
576 | authctxt->valid = 1; | |
577 | ||
578 | buffer_put_char(m, 1); | |
579 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
580 | buffer_put_cstring(m, pwent->pw_name); | |
581 | buffer_put_cstring(m, "*"); | |
582 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 583 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 584 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 585 | #endif |
1853d1ef | 586 | buffer_put_cstring(m, pwent->pw_dir); |
587 | buffer_put_cstring(m, pwent->pw_shell); | |
588 | ||
589 | out: | |
1588c277 | 590 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
1853d1ef | 591 | mm_request_send(socket, MONITOR_ANS_PWNAM, m); |
592 | ||
593 | /* For SSHv1 allow authentication now */ | |
594 | if (!compat20) | |
595 | monitor_permit_authentications(1); | |
94a73cdc | 596 | else { |
1853d1ef | 597 | /* Allow service/style information on the auth context */ |
598 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 599 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
600 | } | |
1853d1ef | 601 | |
efe44db6 | 602 | #ifdef USE_PAM |
7fceb20d | 603 | if (options.use_pam) |
604 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 605 | #endif |
1853d1ef | 606 | |
607 | return (0); | |
608 | } | |
609 | ||
94a73cdc | 610 | int mm_answer_auth2_read_banner(int socket, Buffer *m) |
611 | { | |
612 | char *banner; | |
613 | ||
614 | buffer_clear(m); | |
615 | banner = auth2_read_banner(); | |
616 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
617 | mm_request_send(socket, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
618 | ||
619 | if (banner != NULL) | |
30e37ee6 | 620 | xfree(banner); |
94a73cdc | 621 | |
622 | return (0); | |
623 | } | |
624 | ||
1853d1ef | 625 | int |
626 | mm_answer_authserv(int socket, Buffer *m) | |
627 | { | |
628 | monitor_permit_authentications(1); | |
629 | ||
630 | authctxt->service = buffer_get_string(m, NULL); | |
631 | authctxt->style = buffer_get_string(m, NULL); | |
632 | debug3("%s: service=%s, style=%s", | |
1588c277 | 633 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 634 | |
635 | if (strlen(authctxt->style) == 0) { | |
636 | xfree(authctxt->style); | |
637 | authctxt->style = NULL; | |
638 | } | |
639 | ||
640 | return (0); | |
641 | } | |
642 | ||
643 | int | |
644 | mm_answer_authpassword(int socket, Buffer *m) | |
645 | { | |
646 | static int call_count; | |
647 | char *passwd; | |
d341742a | 648 | int authenticated; |
649 | u_int plen; | |
1853d1ef | 650 | |
651 | passwd = buffer_get_string(m, &plen); | |
652 | /* Only authenticate if the context is valid */ | |
aa586f8e | 653 | authenticated = options.password_authentication && |
96d0bf74 | 654 | auth_password(authctxt, passwd); |
1853d1ef | 655 | memset(passwd, 0, strlen(passwd)); |
656 | xfree(passwd); | |
657 | ||
658 | buffer_clear(m); | |
659 | buffer_put_int(m, authenticated); | |
660 | ||
1588c277 | 661 | debug3("%s: sending result %d", __func__, authenticated); |
1853d1ef | 662 | mm_request_send(socket, MONITOR_ANS_AUTHPASSWORD, m); |
663 | ||
664 | call_count++; | |
665 | if (plen == 0 && call_count == 1) | |
666 | auth_method = "none"; | |
667 | else | |
668 | auth_method = "password"; | |
669 | ||
670 | /* Causes monitor loop to terminate if authenticated */ | |
671 | return (authenticated); | |
672 | } | |
673 | ||
674 | #ifdef BSD_AUTH | |
675 | int | |
676 | mm_answer_bsdauthquery(int socket, Buffer *m) | |
677 | { | |
678 | char *name, *infotxt; | |
679 | u_int numprompts; | |
680 | u_int *echo_on; | |
681 | char **prompts; | |
6d6c25e3 | 682 | u_int success; |
1853d1ef | 683 | |
6d6c25e3 | 684 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
685 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 686 | |
687 | buffer_clear(m); | |
6d6c25e3 | 688 | buffer_put_int(m, success); |
689 | if (success) | |
1853d1ef | 690 | buffer_put_cstring(m, prompts[0]); |
691 | ||
6d6c25e3 | 692 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 693 | mm_request_send(socket, MONITOR_ANS_BSDAUTHQUERY, m); |
694 | ||
6d6c25e3 | 695 | if (success) { |
1853d1ef | 696 | xfree(name); |
697 | xfree(infotxt); | |
698 | xfree(prompts); | |
699 | xfree(echo_on); | |
700 | } | |
701 | ||
702 | return (0); | |
703 | } | |
704 | ||
705 | int | |
706 | mm_answer_bsdauthrespond(int socket, Buffer *m) | |
707 | { | |
708 | char *response; | |
709 | int authok; | |
710 | ||
711 | if (authctxt->as == 0) | |
1588c277 | 712 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 713 | |
714 | response = buffer_get_string(m, NULL); | |
aa586f8e | 715 | authok = options.challenge_response_authentication && |
716 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 717 | authctxt->as = NULL; |
1588c277 | 718 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 719 | xfree(response); |
720 | ||
721 | buffer_clear(m); | |
722 | buffer_put_int(m, authok); | |
723 | ||
1588c277 | 724 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 725 | mm_request_send(socket, MONITOR_ANS_BSDAUTHRESPOND, m); |
726 | ||
727 | auth_method = "bsdauth"; | |
728 | ||
729 | return (authok != 0); | |
730 | } | |
731 | #endif | |
732 | ||
733 | #ifdef SKEY | |
734 | int | |
735 | mm_answer_skeyquery(int socket, Buffer *m) | |
736 | { | |
737 | struct skey skey; | |
738 | char challenge[1024]; | |
6d6c25e3 | 739 | u_int success; |
1853d1ef | 740 | |
6d6c25e3 | 741 | success = skeychallenge(&skey, authctxt->user, challenge) < 0 ? 0 : 1; |
1853d1ef | 742 | |
743 | buffer_clear(m); | |
6d6c25e3 | 744 | buffer_put_int(m, success); |
745 | if (success) | |
1853d1ef | 746 | buffer_put_cstring(m, challenge); |
747 | ||
6d6c25e3 | 748 | debug3("%s: sending challenge success: %u", __func__, success); |
1853d1ef | 749 | mm_request_send(socket, MONITOR_ANS_SKEYQUERY, m); |
750 | ||
751 | return (0); | |
752 | } | |
753 | ||
754 | int | |
755 | mm_answer_skeyrespond(int socket, Buffer *m) | |
756 | { | |
757 | char *response; | |
758 | int authok; | |
759 | ||
760 | response = buffer_get_string(m, NULL); | |
761 | ||
aa586f8e | 762 | authok = (options.challenge_response_authentication && |
763 | authctxt->valid && | |
1853d1ef | 764 | skey_haskey(authctxt->pw->pw_name) == 0 && |
765 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
766 | ||
767 | xfree(response); | |
768 | ||
769 | buffer_clear(m); | |
770 | buffer_put_int(m, authok); | |
771 | ||
1588c277 | 772 | debug3("%s: sending authenticated: %d", __func__, authok); |
1853d1ef | 773 | mm_request_send(socket, MONITOR_ANS_SKEYRESPOND, m); |
774 | ||
775 | auth_method = "skey"; | |
776 | ||
777 | return (authok != 0); | |
778 | } | |
779 | #endif | |
780 | ||
ad200abb | 781 | #ifdef USE_PAM |
782 | int | |
783 | mm_answer_pam_start(int socket, Buffer *m) | |
784 | { | |
7fceb20d | 785 | if (!options.use_pam) |
786 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
787 | ||
529d73ab | 788 | start_pam(authctxt); |
ad200abb | 789 | |
5b9e2464 | 790 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
791 | ||
ad200abb | 792 | return (0); |
793 | } | |
05114c74 | 794 | |
5b9e2464 | 795 | int |
796 | mm_answer_pam_account(int socket, Buffer *m) | |
797 | { | |
798 | u_int ret; | |
b6453d99 | 799 | |
5b9e2464 | 800 | if (!options.use_pam) |
801 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
802 | ||
803 | ret = do_pam_account(); | |
804 | ||
805 | buffer_put_int(m, ret); | |
806 | ||
807 | mm_request_send(socket, MONITOR_ANS_PAM_ACCOUNT, m); | |
808 | ||
809 | return (ret); | |
810 | } | |
811 | ||
05114c74 | 812 | static void *sshpam_ctxt, *sshpam_authok; |
813 | extern KbdintDevice sshpam_device; | |
814 | ||
815 | int | |
816 | mm_answer_pam_init_ctx(int socket, Buffer *m) | |
817 | { | |
818 | ||
819 | debug3("%s", __func__); | |
820 | authctxt->user = buffer_get_string(m, NULL); | |
821 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
822 | sshpam_authok = NULL; | |
823 | buffer_clear(m); | |
824 | if (sshpam_ctxt != NULL) { | |
825 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
826 | buffer_put_int(m, 1); | |
827 | } else { | |
828 | buffer_put_int(m, 0); | |
829 | } | |
830 | mm_request_send(socket, MONITOR_ANS_PAM_INIT_CTX, m); | |
831 | return (0); | |
832 | } | |
833 | ||
834 | int | |
835 | mm_answer_pam_query(int socket, Buffer *m) | |
836 | { | |
837 | char *name, *info, **prompts; | |
838 | u_int num, *echo_on; | |
839 | int i, ret; | |
840 | ||
841 | debug3("%s", __func__); | |
842 | sshpam_authok = NULL; | |
843 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
844 | if (ret == 0 && num == 0) | |
845 | sshpam_authok = sshpam_ctxt; | |
846 | if (num > 1 || name == NULL || info == NULL) | |
847 | ret = -1; | |
848 | buffer_clear(m); | |
849 | buffer_put_int(m, ret); | |
850 | buffer_put_cstring(m, name); | |
851 | xfree(name); | |
852 | buffer_put_cstring(m, info); | |
853 | xfree(info); | |
854 | buffer_put_int(m, num); | |
855 | for (i = 0; i < num; ++i) { | |
856 | buffer_put_cstring(m, prompts[i]); | |
857 | xfree(prompts[i]); | |
858 | buffer_put_int(m, echo_on[i]); | |
859 | } | |
860 | if (prompts != NULL) | |
861 | xfree(prompts); | |
862 | if (echo_on != NULL) | |
863 | xfree(echo_on); | |
864 | mm_request_send(socket, MONITOR_ANS_PAM_QUERY, m); | |
865 | return (0); | |
866 | } | |
867 | ||
868 | int | |
869 | mm_answer_pam_respond(int socket, Buffer *m) | |
870 | { | |
871 | char **resp; | |
872 | u_int num; | |
873 | int i, ret; | |
874 | ||
875 | debug3("%s", __func__); | |
876 | sshpam_authok = NULL; | |
877 | num = buffer_get_int(m); | |
878 | if (num > 0) { | |
879 | resp = xmalloc(num * sizeof(char *)); | |
880 | for (i = 0; i < num; ++i) | |
881 | resp[i] = buffer_get_string(m, NULL); | |
882 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
883 | for (i = 0; i < num; ++i) | |
884 | xfree(resp[i]); | |
885 | xfree(resp); | |
886 | } else { | |
887 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
888 | } | |
889 | buffer_clear(m); | |
890 | buffer_put_int(m, ret); | |
891 | mm_request_send(socket, MONITOR_ANS_PAM_RESPOND, m); | |
892 | auth_method = "keyboard-interactive/pam"; | |
893 | if (ret == 0) | |
894 | sshpam_authok = sshpam_ctxt; | |
895 | return (0); | |
896 | } | |
897 | ||
898 | int | |
899 | mm_answer_pam_free_ctx(int socket, Buffer *m) | |
900 | { | |
901 | ||
902 | debug3("%s", __func__); | |
903 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
904 | buffer_clear(m); | |
905 | mm_request_send(socket, MONITOR_ANS_PAM_FREE_CTX, m); | |
906 | return (sshpam_authok == sshpam_ctxt); | |
907 | } | |
ad200abb | 908 | #endif |
909 | ||
1853d1ef | 910 | static void |
911 | mm_append_debug(Buffer *m) | |
912 | { | |
913 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 914 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 915 | buffer_append(m, buffer_ptr(&auth_debug), |
916 | buffer_len(&auth_debug)); | |
917 | buffer_clear(&auth_debug); | |
918 | } | |
919 | } | |
920 | ||
921 | int | |
922 | mm_answer_keyallowed(int socket, Buffer *m) | |
923 | { | |
924 | Key *key; | |
661e45a0 | 925 | char *cuser, *chost; |
926 | u_char *blob; | |
1853d1ef | 927 | u_int bloblen; |
928 | enum mm_keytype type = 0; | |
929 | int allowed = 0; | |
930 | ||
1588c277 | 931 | debug3("%s entering", __func__); |
1853d1ef | 932 | |
933 | type = buffer_get_int(m); | |
934 | cuser = buffer_get_string(m, NULL); | |
935 | chost = buffer_get_string(m, NULL); | |
936 | blob = buffer_get_string(m, &bloblen); | |
937 | ||
938 | key = key_from_blob(blob, bloblen); | |
939 | ||
940 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
941 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 942 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 943 | |
1588c277 | 944 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 945 | |
fdaef11e | 946 | if (key != NULL && authctxt->valid) { |
1853d1ef | 947 | switch(type) { |
948 | case MM_USERKEY: | |
aa586f8e | 949 | allowed = options.pubkey_authentication && |
950 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 951 | break; |
952 | case MM_HOSTKEY: | |
aa586f8e | 953 | allowed = options.hostbased_authentication && |
954 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 955 | cuser, chost, key); |
956 | break; | |
957 | case MM_RSAHOSTKEY: | |
958 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 959 | allowed = options.rhosts_rsa_authentication && |
960 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 961 | cuser, chost, key); |
962 | break; | |
963 | default: | |
1588c277 | 964 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 965 | break; |
966 | } | |
1853d1ef | 967 | } |
3e2f2431 | 968 | if (key != NULL) |
969 | key_free(key); | |
1853d1ef | 970 | |
971 | /* clear temporarily storage (used by verify) */ | |
972 | monitor_reset_key_state(); | |
973 | ||
974 | if (allowed) { | |
975 | /* Save temporarily for comparison in verify */ | |
976 | key_blob = blob; | |
977 | key_bloblen = bloblen; | |
978 | key_blobtype = type; | |
979 | hostbased_cuser = cuser; | |
980 | hostbased_chost = chost; | |
981 | } | |
982 | ||
983 | debug3("%s: key %p is %s", | |
1588c277 | 984 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 985 | |
986 | buffer_clear(m); | |
987 | buffer_put_int(m, allowed); | |
92e15201 | 988 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 989 | |
990 | mm_append_debug(m); | |
991 | ||
992 | mm_request_send(socket, MONITOR_ANS_KEYALLOWED, m); | |
993 | ||
994 | if (type == MM_RSAHOSTKEY) | |
995 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
996 | ||
997 | return (0); | |
998 | } | |
999 | ||
1000 | static int | |
1001 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1002 | { | |
1003 | Buffer b; | |
661e45a0 | 1004 | char *p; |
1853d1ef | 1005 | u_int len; |
1006 | int fail = 0; | |
1853d1ef | 1007 | |
1008 | buffer_init(&b); | |
1009 | buffer_append(&b, data, datalen); | |
1010 | ||
1011 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1012 | p = buffer_ptr(&b); |
1013 | len = buffer_len(&b); | |
1014 | if ((session_id2 == NULL) || | |
1015 | (len < session_id2_len) || | |
1016 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1017 | fail++; | |
1853d1ef | 1018 | buffer_consume(&b, session_id2_len); |
1019 | } else { | |
521d606b | 1020 | p = buffer_get_string(&b, &len); |
1021 | if ((session_id2 == NULL) || | |
1022 | (len != session_id2_len) || | |
1023 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1024 | fail++; |
521d606b | 1025 | xfree(p); |
1853d1ef | 1026 | } |
1027 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1028 | fail++; | |
1029 | p = buffer_get_string(&b, NULL); | |
1030 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1031 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1032 | authctxt->user, p); |
1033 | fail++; | |
1034 | } | |
1035 | xfree(p); | |
1036 | buffer_skip_string(&b); | |
1037 | if (datafellows & SSH_BUG_PKAUTH) { | |
1038 | if (!buffer_get_char(&b)) | |
1039 | fail++; | |
1040 | } else { | |
1041 | p = buffer_get_string(&b, NULL); | |
1042 | if (strcmp("publickey", p) != 0) | |
1043 | fail++; | |
1044 | xfree(p); | |
1045 | if (!buffer_get_char(&b)) | |
1046 | fail++; | |
1047 | buffer_skip_string(&b); | |
1048 | } | |
1049 | buffer_skip_string(&b); | |
1050 | if (buffer_len(&b) != 0) | |
1051 | fail++; | |
1052 | buffer_free(&b); | |
1053 | return (fail == 0); | |
1054 | } | |
1055 | ||
1056 | static int | |
661e45a0 | 1057 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1058 | char *chost) | |
1853d1ef | 1059 | { |
1060 | Buffer b; | |
661e45a0 | 1061 | char *p; |
1853d1ef | 1062 | u_int len; |
1063 | int fail = 0; | |
1853d1ef | 1064 | |
1065 | buffer_init(&b); | |
1066 | buffer_append(&b, data, datalen); | |
1067 | ||
521d606b | 1068 | p = buffer_get_string(&b, &len); |
1069 | if ((session_id2 == NULL) || | |
1070 | (len != session_id2_len) || | |
1071 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1072 | fail++; |
521d606b | 1073 | xfree(p); |
1074 | ||
1853d1ef | 1075 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1076 | fail++; | |
1077 | p = buffer_get_string(&b, NULL); | |
1078 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1079 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1080 | authctxt->user, p); |
1081 | fail++; | |
1082 | } | |
1083 | xfree(p); | |
1084 | buffer_skip_string(&b); /* service */ | |
1085 | p = buffer_get_string(&b, NULL); | |
1086 | if (strcmp(p, "hostbased") != 0) | |
1087 | fail++; | |
1088 | xfree(p); | |
1089 | buffer_skip_string(&b); /* pkalg */ | |
1090 | buffer_skip_string(&b); /* pkblob */ | |
1091 | ||
1092 | /* verify client host, strip trailing dot if necessary */ | |
1093 | p = buffer_get_string(&b, NULL); | |
1094 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1095 | p[len - 1] = '\0'; | |
1096 | if (strcmp(p, chost) != 0) | |
1097 | fail++; | |
1098 | xfree(p); | |
1099 | ||
1100 | /* verify client user */ | |
1101 | p = buffer_get_string(&b, NULL); | |
1102 | if (strcmp(p, cuser) != 0) | |
1103 | fail++; | |
1104 | xfree(p); | |
1105 | ||
1106 | if (buffer_len(&b) != 0) | |
1107 | fail++; | |
1108 | buffer_free(&b); | |
1109 | return (fail == 0); | |
1110 | } | |
1111 | ||
1112 | int | |
1113 | mm_answer_keyverify(int socket, Buffer *m) | |
1114 | { | |
1115 | Key *key; | |
1116 | u_char *signature, *data, *blob; | |
1117 | u_int signaturelen, datalen, bloblen; | |
1118 | int verified = 0; | |
1119 | int valid_data = 0; | |
1120 | ||
1121 | blob = buffer_get_string(m, &bloblen); | |
1122 | signature = buffer_get_string(m, &signaturelen); | |
1123 | data = buffer_get_string(m, &datalen); | |
1124 | ||
1125 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1126 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1127 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1128 | |
1129 | key = key_from_blob(blob, bloblen); | |
1130 | if (key == NULL) | |
1588c277 | 1131 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1132 | |
1133 | switch (key_blobtype) { | |
1134 | case MM_USERKEY: | |
1135 | valid_data = monitor_valid_userblob(data, datalen); | |
1136 | break; | |
1137 | case MM_HOSTKEY: | |
1138 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1139 | hostbased_cuser, hostbased_chost); | |
1140 | break; | |
1141 | default: | |
1142 | valid_data = 0; | |
1143 | break; | |
1144 | } | |
1145 | if (!valid_data) | |
1588c277 | 1146 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1147 | |
1148 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1149 | debug3("%s: key %p signature %s", | |
1588c277 | 1150 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1151 | |
1152 | key_free(key); | |
1153 | xfree(blob); | |
1154 | xfree(signature); | |
1155 | xfree(data); | |
1156 | ||
d17ef027 | 1157 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1158 | ||
1853d1ef | 1159 | monitor_reset_key_state(); |
1160 | ||
1161 | buffer_clear(m); | |
1162 | buffer_put_int(m, verified); | |
1163 | mm_request_send(socket, MONITOR_ANS_KEYVERIFY, m); | |
1164 | ||
1853d1ef | 1165 | return (verified); |
1166 | } | |
1167 | ||
1168 | static void | |
1169 | mm_record_login(Session *s, struct passwd *pw) | |
1170 | { | |
1171 | socklen_t fromlen; | |
1172 | struct sockaddr_storage from; | |
1173 | ||
1174 | /* | |
1175 | * Get IP address of client. If the connection is not a socket, let | |
1176 | * the address be 0.0.0.0. | |
1177 | */ | |
1178 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1179 | fromlen = sizeof(from); |
1853d1ef | 1180 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1181 | if (getpeername(packet_get_connection_in(), |
1182 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1183 | debug("getpeername: %.100s", strerror(errno)); | |
2362db19 | 1184 | cleanup_exit(255); |
1853d1ef | 1185 | } |
1186 | } | |
1187 | /* Record that there was a login on that tty from the remote host. */ | |
1188 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1189 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1190 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1191 | } |
1192 | ||
1193 | static void | |
1194 | mm_session_close(Session *s) | |
1195 | { | |
b9ed513a | 1196 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1197 | if (s->ttyfd != -1) { |
1588c277 | 1198 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1199 | session_pty_cleanup2(s); |
1200 | } | |
1201 | s->used = 0; | |
1202 | } | |
1203 | ||
1204 | int | |
1205 | mm_answer_pty(int socket, Buffer *m) | |
1206 | { | |
b5a28cbc | 1207 | extern struct monitor *pmonitor; |
1853d1ef | 1208 | Session *s; |
1209 | int res, fd0; | |
1210 | ||
1588c277 | 1211 | debug3("%s entering", __func__); |
1853d1ef | 1212 | |
1213 | buffer_clear(m); | |
1214 | s = session_new(); | |
1215 | if (s == NULL) | |
1216 | goto error; | |
1217 | s->authctxt = authctxt; | |
1218 | s->pw = authctxt->pw; | |
b5a28cbc | 1219 | s->pid = pmonitor->m_pid; |
1853d1ef | 1220 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1221 | if (res == 0) | |
1222 | goto error; | |
1853d1ef | 1223 | pty_setowner(authctxt->pw, s->tty); |
1224 | ||
1225 | buffer_put_int(m, 1); | |
1226 | buffer_put_cstring(m, s->tty); | |
1227 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1228 | ||
1229 | mm_send_fd(socket, s->ptyfd); | |
1230 | mm_send_fd(socket, s->ttyfd); | |
1231 | ||
1232 | /* We need to trick ttyslot */ | |
1233 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1234 | fatal("%s: dup2", __func__); |
1853d1ef | 1235 | |
1236 | mm_record_login(s, authctxt->pw); | |
1237 | ||
1238 | /* Now we can close the file descriptor again */ | |
1239 | close(0); | |
1240 | ||
1241 | /* make sure nothing uses fd 0 */ | |
1242 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1243 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1244 | if (fd0 != 0) |
1588c277 | 1245 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1246 | |
1247 | /* slave is not needed */ | |
1248 | close(s->ttyfd); | |
1249 | s->ttyfd = s->ptyfd; | |
1250 | /* no need to dup() because nobody closes ptyfd */ | |
1251 | s->ptymaster = s->ptyfd; | |
1252 | ||
1588c277 | 1253 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1254 | |
1255 | return (0); | |
1256 | ||
1257 | error: | |
1258 | if (s != NULL) | |
1259 | mm_session_close(s); | |
1260 | buffer_put_int(m, 0); | |
1261 | mm_request_send(socket, MONITOR_ANS_PTY, m); | |
1262 | return (0); | |
1263 | } | |
1264 | ||
1265 | int | |
1266 | mm_answer_pty_cleanup(int socket, Buffer *m) | |
1267 | { | |
1268 | Session *s; | |
1269 | char *tty; | |
1270 | ||
1588c277 | 1271 | debug3("%s entering", __func__); |
1853d1ef | 1272 | |
1273 | tty = buffer_get_string(m, NULL); | |
1274 | if ((s = session_by_tty(tty)) != NULL) | |
1275 | mm_session_close(s); | |
1276 | buffer_clear(m); | |
1277 | xfree(tty); | |
1278 | return (0); | |
1279 | } | |
1280 | ||
1281 | int | |
1282 | mm_answer_sesskey(int socket, Buffer *m) | |
1283 | { | |
1284 | BIGNUM *p; | |
1285 | int rsafail; | |
1286 | ||
1287 | /* Turn off permissions */ | |
1288 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
1289 | ||
1290 | if ((p = BN_new()) == NULL) | |
1588c277 | 1291 | fatal("%s: BN_new", __func__); |
1853d1ef | 1292 | |
1293 | buffer_get_bignum2(m, p); | |
1294 | ||
1295 | rsafail = ssh1_session_key(p); | |
1296 | ||
1297 | buffer_clear(m); | |
1298 | buffer_put_int(m, rsafail); | |
1299 | buffer_put_bignum2(m, p); | |
1300 | ||
1301 | BN_clear_free(p); | |
1302 | ||
1303 | mm_request_send(socket, MONITOR_ANS_SESSKEY, m); | |
1304 | ||
1305 | /* Turn on permissions for sessid passing */ | |
1306 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1307 | ||
1308 | return (0); | |
1309 | } | |
1310 | ||
1311 | int | |
1312 | mm_answer_sessid(int socket, Buffer *m) | |
1313 | { | |
1314 | int i; | |
1315 | ||
1588c277 | 1316 | debug3("%s entering", __func__); |
1853d1ef | 1317 | |
1318 | if (buffer_len(m) != 16) | |
1588c277 | 1319 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1320 | for (i = 0; i < 16; i++) |
1321 | session_id[i] = buffer_get_char(m); | |
1322 | ||
1323 | /* Turn on permissions for getpwnam */ | |
1324 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1325 | ||
1326 | return (0); | |
1327 | } | |
1328 | ||
1329 | int | |
1330 | mm_answer_rsa_keyallowed(int socket, Buffer *m) | |
1331 | { | |
1332 | BIGNUM *client_n; | |
1333 | Key *key = NULL; | |
1334 | u_char *blob = NULL; | |
1335 | u_int blen = 0; | |
1336 | int allowed = 0; | |
1337 | ||
1588c277 | 1338 | debug3("%s entering", __func__); |
1853d1ef | 1339 | |
aa586f8e | 1340 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1341 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1342 | fatal("%s: BN_new", __func__); |
1853d1ef | 1343 | buffer_get_bignum2(m, client_n); |
1344 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1345 | BN_clear_free(client_n); | |
1346 | } | |
1347 | buffer_clear(m); | |
1348 | buffer_put_int(m, allowed); | |
92e15201 | 1349 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1350 | |
1351 | /* clear temporarily storage (used by generate challenge) */ | |
1352 | monitor_reset_key_state(); | |
1353 | ||
1354 | if (allowed && key != NULL) { | |
1355 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1356 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1357 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1358 | buffer_put_string(m, blob, blen); |
1359 | ||
1360 | /* Save temporarily for comparison in verify */ | |
1361 | key_blob = blob; | |
1362 | key_bloblen = blen; | |
1363 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1364 | } |
3e2f2431 | 1365 | if (key != NULL) |
1366 | key_free(key); | |
1853d1ef | 1367 | |
1368 | mm_append_debug(m); | |
1369 | ||
1370 | mm_request_send(socket, MONITOR_ANS_RSAKEYALLOWED, m); | |
1371 | ||
1372 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1373 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1374 | return (0); | |
1375 | } | |
1376 | ||
1377 | int | |
1378 | mm_answer_rsa_challenge(int socket, Buffer *m) | |
1379 | { | |
1380 | Key *key = NULL; | |
1381 | u_char *blob; | |
1382 | u_int blen; | |
1383 | ||
1588c277 | 1384 | debug3("%s entering", __func__); |
1853d1ef | 1385 | |
1386 | if (!authctxt->valid) | |
1588c277 | 1387 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1388 | blob = buffer_get_string(m, &blen); |
1389 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1390 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1391 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1392 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1393 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1394 | fatal("%s: received bad key", __func__); |
1853d1ef | 1395 | |
1396 | if (ssh1_challenge) | |
1397 | BN_clear_free(ssh1_challenge); | |
1398 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1399 | ||
1400 | buffer_clear(m); | |
1401 | buffer_put_bignum2(m, ssh1_challenge); | |
1402 | ||
1588c277 | 1403 | debug3("%s sending reply", __func__); |
1853d1ef | 1404 | mm_request_send(socket, MONITOR_ANS_RSACHALLENGE, m); |
1405 | ||
1406 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1407 | |
1408 | xfree(blob); | |
1409 | key_free(key); | |
1853d1ef | 1410 | return (0); |
1411 | } | |
1412 | ||
1413 | int | |
1414 | mm_answer_rsa_response(int socket, Buffer *m) | |
1415 | { | |
1416 | Key *key = NULL; | |
1417 | u_char *blob, *response; | |
1418 | u_int blen, len; | |
1419 | int success; | |
1420 | ||
1588c277 | 1421 | debug3("%s entering", __func__); |
1853d1ef | 1422 | |
1423 | if (!authctxt->valid) | |
1588c277 | 1424 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1425 | if (ssh1_challenge == NULL) |
1588c277 | 1426 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1427 | |
1428 | blob = buffer_get_string(m, &blen); | |
1429 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1430 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1431 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1432 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1433 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1434 | fatal("%s: received bad key", __func__); |
1853d1ef | 1435 | response = buffer_get_string(m, &len); |
1436 | if (len != 16) | |
1588c277 | 1437 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1438 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1439 | ||
3e2f2431 | 1440 | xfree(blob); |
1853d1ef | 1441 | key_free(key); |
1442 | xfree(response); | |
1443 | ||
1444 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1445 | ||
1446 | /* reset state */ | |
1447 | BN_clear_free(ssh1_challenge); | |
1448 | ssh1_challenge = NULL; | |
1449 | monitor_reset_key_state(); | |
1450 | ||
1451 | buffer_clear(m); | |
1452 | buffer_put_int(m, success); | |
1453 | mm_request_send(socket, MONITOR_ANS_RSARESPONSE, m); | |
1454 | ||
1455 | return (success); | |
1456 | } | |
1457 | ||
1458 | int | |
1459 | mm_answer_term(int socket, Buffer *req) | |
1460 | { | |
b5a28cbc | 1461 | extern struct monitor *pmonitor; |
1853d1ef | 1462 | int res, status; |
1463 | ||
1588c277 | 1464 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1465 | |
1466 | /* The child is terminating */ | |
1467 | session_destroy_all(&mm_session_close); | |
1468 | ||
b5a28cbc | 1469 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1470 | if (errno != EINTR) |
1471 | exit(1); | |
1853d1ef | 1472 | |
1473 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1474 | ||
1475 | /* Terminate process */ | |
1476 | exit (res); | |
1477 | } | |
1478 | ||
1479 | void | |
b5a28cbc | 1480 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1481 | { |
1482 | if (compat20) { | |
1483 | set_newkeys(MODE_IN); | |
1484 | set_newkeys(MODE_OUT); | |
1485 | } else { | |
1853d1ef | 1486 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1487 | packet_set_encryption_key(child_state.ssh1key, |
1488 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1489 | xfree(child_state.ssh1key); | |
1853d1ef | 1490 | } |
1491 | ||
9459414c | 1492 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1493 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1494 | xfree(child_state.keyout); | |
1495 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1496 | xfree(child_state.keyin); | |
1497 | ||
1498 | if (!compat20) { | |
1499 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1500 | xfree(child_state.ivout); | |
1501 | packet_set_iv(MODE_IN, child_state.ivin); | |
1502 | xfree(child_state.ivin); | |
1503 | } | |
1504 | ||
1505 | memcpy(&incoming_stream, &child_state.incoming, | |
1506 | sizeof(incoming_stream)); | |
1507 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1508 | sizeof(outgoing_stream)); | |
1509 | ||
1510 | /* Update with new address */ | |
0496cf34 | 1511 | if (options.compression) |
1512 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1513 | |
1514 | /* Network I/O buffers */ | |
1515 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1516 | buffer_clear(&input); | |
1517 | buffer_append(&input, child_state.input, child_state.ilen); | |
1518 | memset(child_state.input, 0, child_state.ilen); | |
1519 | xfree(child_state.input); | |
1520 | ||
1521 | buffer_clear(&output); | |
1522 | buffer_append(&output, child_state.output, child_state.olen); | |
1523 | memset(child_state.output, 0, child_state.olen); | |
1524 | xfree(child_state.output); | |
1525 | } | |
1526 | ||
1527 | static Kex * | |
1528 | mm_get_kex(Buffer *m) | |
1529 | { | |
1530 | Kex *kex; | |
1531 | void *blob; | |
1532 | u_int bloblen; | |
1533 | ||
1534 | kex = xmalloc(sizeof(*kex)); | |
1535 | memset(kex, 0, sizeof(*kex)); | |
1536 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1537 | if ((session_id2 == NULL) || |
1538 | (kex->session_id_len != session_id2_len) || | |
1539 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1540 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1541 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1542 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
1543 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1853d1ef | 1544 | kex->server = 1; |
1545 | kex->hostkey_type = buffer_get_int(m); | |
1546 | kex->kex_type = buffer_get_int(m); | |
1547 | blob = buffer_get_string(m, &bloblen); | |
1548 | buffer_init(&kex->my); | |
1549 | buffer_append(&kex->my, blob, bloblen); | |
1550 | xfree(blob); | |
1551 | blob = buffer_get_string(m, &bloblen); | |
1552 | buffer_init(&kex->peer); | |
1553 | buffer_append(&kex->peer, blob, bloblen); | |
1554 | xfree(blob); | |
1555 | kex->done = 1; | |
1556 | kex->flags = buffer_get_int(m); | |
1557 | kex->client_version_string = buffer_get_string(m, NULL); | |
1558 | kex->server_version_string = buffer_get_string(m, NULL); | |
1559 | kex->load_host_key=&get_hostkey_by_type; | |
1560 | kex->host_key_index=&get_hostkey_index; | |
1561 | ||
1562 | return (kex); | |
1563 | } | |
1564 | ||
1565 | /* This function requries careful sanity checking */ | |
1566 | ||
1567 | void | |
b5a28cbc | 1568 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1569 | { |
1570 | Buffer m; | |
1571 | u_char *blob, *p; | |
1572 | u_int bloblen, plen; | |
ffd7b36b | 1573 | u_int32_t seqnr, packets; |
1574 | u_int64_t blocks; | |
1853d1ef | 1575 | |
1588c277 | 1576 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1577 | |
1578 | buffer_init(&m); | |
b5a28cbc | 1579 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1580 | if (!compat20) { |
1581 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1582 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1583 | child_state.ssh1key = buffer_get_string(&m, |
1584 | &child_state.ssh1keylen); | |
1853d1ef | 1585 | child_state.ivout = buffer_get_string(&m, |
1586 | &child_state.ivoutlen); | |
1587 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1588 | goto skip; | |
1589 | } else { | |
1590 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1591 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1592 | } |
1593 | ||
1594 | blob = buffer_get_string(&m, &bloblen); | |
1595 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1596 | xfree(blob); | |
1597 | ||
1588c277 | 1598 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1599 | blob = buffer_get_string(&m, &bloblen); |
1600 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1601 | xfree(blob); | |
1602 | ||
1603 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1604 | seqnr = buffer_get_int(&m); |
1605 | blocks = buffer_get_int64(&m); | |
1606 | packets = buffer_get_int(&m); | |
1607 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1608 | seqnr = buffer_get_int(&m); | |
1609 | blocks = buffer_get_int64(&m); | |
1610 | packets = buffer_get_int(&m); | |
1611 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1612 | |
1613 | skip: | |
1614 | /* Get the key context */ | |
1615 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1616 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1617 | ||
1588c277 | 1618 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1619 | /* Get compression state */ |
1620 | p = buffer_get_string(&m, &plen); | |
1621 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1622 | fatal("%s: bad request size", __func__); |
1853d1ef | 1623 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1624 | xfree(p); | |
1625 | ||
1626 | p = buffer_get_string(&m, &plen); | |
1627 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1628 | fatal("%s: bad request size", __func__); |
1853d1ef | 1629 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1630 | xfree(p); | |
1631 | ||
1632 | /* Network I/O buffers */ | |
1588c277 | 1633 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1634 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1635 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1636 | ||
1637 | buffer_free(&m); | |
1638 | } | |
1639 | ||
1640 | ||
1641 | /* Allocation functions for zlib */ | |
1642 | void * | |
1643 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1644 | { | |
39e71188 | 1645 | size_t len = (size_t) size * ncount; |
1853d1ef | 1646 | void *address; |
1647 | ||
b85698ab | 1648 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1649 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1650 | ||
1651 | address = mm_malloc(mm, len); | |
1853d1ef | 1652 | |
1653 | return (address); | |
1654 | } | |
1655 | ||
1656 | void | |
1657 | mm_zfree(struct mm_master *mm, void *address) | |
1658 | { | |
1659 | mm_free(mm, address); | |
1660 | } | |
1661 | ||
1662 | void | |
1663 | mm_init_compression(struct mm_master *mm) | |
1664 | { | |
1665 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1666 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1667 | outgoing_stream.opaque = mm; | |
1668 | ||
1669 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1670 | incoming_stream.zfree = (free_func)mm_zfree; | |
1671 | incoming_stream.opaque = mm; | |
1672 | } | |
1673 | ||
1674 | /* XXX */ | |
1675 | ||
1676 | #define FD_CLOSEONEXEC(x) do { \ | |
1677 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1678 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1679 | } while (0) | |
1680 | ||
1681 | static void | |
1682 | monitor_socketpair(int *pair) | |
1683 | { | |
f1af2dbf | 1684 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1685 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1686 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1687 | #else |
1688 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1689 | __func__); |
f1af2dbf | 1690 | #endif |
1853d1ef | 1691 | FD_CLOSEONEXEC(pair[0]); |
1692 | FD_CLOSEONEXEC(pair[1]); | |
1693 | } | |
1694 | ||
1695 | #define MM_MEMSIZE 65536 | |
1696 | ||
1697 | struct monitor * | |
1698 | monitor_init(void) | |
1699 | { | |
1700 | struct monitor *mon; | |
1701 | int pair[2]; | |
1702 | ||
1703 | mon = xmalloc(sizeof(*mon)); | |
1704 | ||
a9b33b95 | 1705 | mon->m_pid = 0; |
1853d1ef | 1706 | monitor_socketpair(pair); |
1707 | ||
1708 | mon->m_recvfd = pair[0]; | |
1709 | mon->m_sendfd = pair[1]; | |
1710 | ||
1711 | /* Used to share zlib space across processes */ | |
0496cf34 | 1712 | if (options.compression) { |
1713 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1714 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1715 | |
0496cf34 | 1716 | /* Compression needs to share state across borders */ |
1717 | mm_init_compression(mon->m_zlib); | |
1718 | } | |
1853d1ef | 1719 | |
1720 | return mon; | |
1721 | } | |
1722 | ||
1723 | void | |
1724 | monitor_reinit(struct monitor *mon) | |
1725 | { | |
1726 | int pair[2]; | |
1727 | ||
1728 | monitor_socketpair(pair); | |
1729 | ||
1730 | mon->m_recvfd = pair[0]; | |
1731 | mon->m_sendfd = pair[1]; | |
1732 | } | |
7364bd04 | 1733 | |
1734 | #ifdef GSSAPI | |
1735 | int | |
1736 | mm_answer_gss_setup_ctx(int socket, Buffer *m) | |
1737 | { | |
1738 | gss_OID_desc oid; | |
1739 | OM_uint32 major; | |
1740 | u_int len; | |
1741 | ||
1742 | oid.elements = buffer_get_string(m, &len); | |
1743 | oid.length = len; | |
1744 | ||
1745 | major = ssh_gssapi_server_ctx(&gsscontext, &oid); | |
1746 | ||
1747 | xfree(oid.elements); | |
1748 | ||
1749 | buffer_clear(m); | |
1750 | buffer_put_int(m, major); | |
1751 | ||
1752 | mm_request_send(socket,MONITOR_ANS_GSSSETUP, m); | |
1753 | ||
1754 | /* Now we have a context, enable the step */ | |
1755 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1756 | ||
1757 | return (0); | |
1758 | } | |
1759 | ||
1760 | int | |
1761 | mm_answer_gss_accept_ctx(int socket, Buffer *m) | |
1762 | { | |
1763 | gss_buffer_desc in; | |
1764 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1765 | OM_uint32 major,minor; | |
1766 | OM_uint32 flags = 0; /* GSI needs this */ | |
f99e1ca4 | 1767 | u_int len; |
7364bd04 | 1768 | |
f99e1ca4 | 1769 | in.value = buffer_get_string(m, &len); |
1770 | in.length = len; | |
7364bd04 | 1771 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1772 | xfree(in.value); | |
1773 | ||
1774 | buffer_clear(m); | |
1775 | buffer_put_int(m, major); | |
1776 | buffer_put_string(m, out.value, out.length); | |
1777 | buffer_put_int(m, flags); | |
1778 | mm_request_send(socket, MONITOR_ANS_GSSSTEP, m); | |
1779 | ||
1780 | gss_release_buffer(&minor, &out); | |
1781 | ||
7364bd04 | 1782 | if (major==GSS_S_COMPLETE) { |
1783 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); | |
1784 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1785 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1786 | } |
1787 | return (0); | |
1788 | } | |
1789 | ||
0789992b | 1790 | int |
1791 | mm_answer_gss_checkmic(int socket, Buffer *m) | |
1792 | { | |
1793 | gss_buffer_desc gssbuf, mic; | |
1794 | OM_uint32 ret; | |
1795 | u_int len; | |
b6453d99 | 1796 | |
0789992b | 1797 | gssbuf.value = buffer_get_string(m, &len); |
1798 | gssbuf.length = len; | |
1799 | mic.value = buffer_get_string(m, &len); | |
1800 | mic.length = len; | |
b6453d99 | 1801 | |
0789992b | 1802 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1803 | |
0789992b | 1804 | xfree(gssbuf.value); |
1805 | xfree(mic.value); | |
b6453d99 | 1806 | |
0789992b | 1807 | buffer_clear(m); |
1808 | buffer_put_int(m, ret); | |
b6453d99 | 1809 | |
0789992b | 1810 | mm_request_send(socket, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1811 | |
0789992b | 1812 | if (!GSS_ERROR(ret)) |
1813 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1814 | |
0789992b | 1815 | return (0); |
1816 | } | |
1817 | ||
7364bd04 | 1818 | int |
1819 | mm_answer_gss_userok(int socket, Buffer *m) | |
1820 | { | |
1821 | int authenticated; | |
1822 | ||
1823 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1824 | ||
1825 | buffer_clear(m); | |
1826 | buffer_put_int(m, authenticated); | |
1827 | ||
1828 | debug3("%s: sending result %d", __func__, authenticated); | |
1829 | mm_request_send(socket, MONITOR_ANS_GSSUSEROK, m); | |
1830 | ||
0789992b | 1831 | auth_method="gssapi-with-mic"; |
7364bd04 | 1832 | |
1833 | /* Monitor loop will terminate if authenticated */ | |
1834 | return (authenticated); | |
1835 | } | |
1836 | #endif /* GSSAPI */ |