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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" | |
2ff8003a | 28 | RCSID("$OpenBSD: monitor.c,v 1.69 2006/03/07 09:07:40 djm Exp $"); |
aa2eae64 | 29 | |
30 | #include <sys/types.h> | |
31 | #include <sys/wait.h> | |
1853d1ef | 32 | |
b5b88c19 | 33 | #ifdef HAVE_PATHS_H |
a75f5360 | 34 | #include <paths.h> |
b5b88c19 | 35 | #endif |
ada68823 | 36 | #include <signal.h> |
1853d1ef | 37 | |
38 | #ifdef SKEY | |
39 | #include <skey.h> | |
40 | #endif | |
41 | ||
a75f5360 | 42 | #include <openssl/dh.h> |
43 | ||
1853d1ef | 44 | #include "ssh.h" |
45 | #include "auth.h" | |
46 | #include "kex.h" | |
47 | #include "dh.h" | |
a655c012 | 48 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
49 | #undef TARGET_OS_MAC | |
9b08c23f | 50 | #include "zlib.h" |
a655c012 | 51 | #define TARGET_OS_MAC 1 |
52 | #else | |
53 | #include "zlib.h" | |
54 | #endif | |
1853d1ef | 55 | #include "packet.h" |
56 | #include "auth-options.h" | |
57 | #include "sshpty.h" | |
58 | #include "channels.h" | |
59 | #include "session.h" | |
60 | #include "sshlogin.h" | |
61 | #include "canohost.h" | |
62 | #include "log.h" | |
63 | #include "servconf.h" | |
64 | #include "monitor.h" | |
65 | #include "monitor_mm.h" | |
66 | #include "monitor_wrap.h" | |
67 | #include "monitor_fdpass.h" | |
68 | #include "xmalloc.h" | |
69 | #include "misc.h" | |
70 | #include "buffer.h" | |
71 | #include "bufaux.h" | |
72 | #include "compat.h" | |
73 | #include "ssh2.h" | |
1853d1ef | 74 | |
7364bd04 | 75 | #ifdef GSSAPI |
76 | #include "ssh-gss.h" | |
77 | static Gssctxt *gsscontext = NULL; | |
78 | #endif | |
79 | ||
1853d1ef | 80 | /* Imports */ |
81 | extern ServerOptions options; | |
82 | extern u_int utmp_len; | |
83 | extern Newkeys *current_keys[]; | |
84 | extern z_stream incoming_stream; | |
85 | extern z_stream outgoing_stream; | |
86 | extern u_char session_id[]; | |
87 | extern Buffer input, output; | |
88 | extern Buffer auth_debug; | |
89 | extern int auth_debug_init; | |
be2ca0c9 | 90 | extern Buffer loginmsg; |
1853d1ef | 91 | |
92 | /* State exported from the child */ | |
93 | ||
94 | struct { | |
95 | z_stream incoming; | |
96 | z_stream outgoing; | |
97 | u_char *keyin; | |
98 | u_int keyinlen; | |
99 | u_char *keyout; | |
100 | u_int keyoutlen; | |
101 | u_char *ivin; | |
102 | u_int ivinlen; | |
103 | u_char *ivout; | |
104 | u_int ivoutlen; | |
9459414c | 105 | u_char *ssh1key; |
106 | u_int ssh1keylen; | |
1853d1ef | 107 | int ssh1cipher; |
108 | int ssh1protoflags; | |
109 | u_char *input; | |
110 | u_int ilen; | |
111 | u_char *output; | |
112 | u_int olen; | |
113 | } child_state; | |
114 | ||
b8e04133 | 115 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 116 | |
117 | int mm_answer_moduli(int, Buffer *); | |
118 | int mm_answer_sign(int, Buffer *); | |
119 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 120 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 121 | int mm_answer_authserv(int, Buffer *); |
122 | int mm_answer_authpassword(int, Buffer *); | |
123 | int mm_answer_bsdauthquery(int, Buffer *); | |
124 | int mm_answer_bsdauthrespond(int, Buffer *); | |
125 | int mm_answer_skeyquery(int, Buffer *); | |
126 | int mm_answer_skeyrespond(int, Buffer *); | |
127 | int mm_answer_keyallowed(int, Buffer *); | |
128 | int mm_answer_keyverify(int, Buffer *); | |
129 | int mm_answer_pty(int, Buffer *); | |
130 | int mm_answer_pty_cleanup(int, Buffer *); | |
131 | int mm_answer_term(int, Buffer *); | |
132 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
133 | int mm_answer_rsa_challenge(int, Buffer *); | |
134 | int mm_answer_rsa_response(int, Buffer *); | |
135 | int mm_answer_sesskey(int, Buffer *); | |
136 | int mm_answer_sessid(int, Buffer *); | |
137 | ||
ad200abb | 138 | #ifdef USE_PAM |
139 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 140 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 141 | int mm_answer_pam_init_ctx(int, Buffer *); |
142 | int mm_answer_pam_query(int, Buffer *); | |
143 | int mm_answer_pam_respond(int, Buffer *); | |
144 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 145 | #endif |
146 | ||
7364bd04 | 147 | #ifdef GSSAPI |
148 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
149 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
150 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 151 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 152 | #endif |
696f6bef | 153 | |
6039eeef | 154 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 155 | int mm_answer_audit_event(int, Buffer *); |
156 | int mm_answer_audit_command(int, Buffer *); | |
157 | #endif | |
158 | ||
1853d1ef | 159 | static Authctxt *authctxt; |
160 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
161 | ||
162 | /* local state for key verify */ | |
163 | static u_char *key_blob = NULL; | |
164 | static u_int key_bloblen = 0; | |
165 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 166 | static char *hostbased_cuser = NULL; |
167 | static char *hostbased_chost = NULL; | |
1853d1ef | 168 | static char *auth_method = "unknown"; |
a27002e5 | 169 | static u_int session_id2_len = 0; |
521d606b | 170 | static u_char *session_id2 = NULL; |
3a39206f | 171 | static pid_t monitor_child_pid; |
1853d1ef | 172 | |
173 | struct mon_table { | |
174 | enum monitor_reqtype type; | |
175 | int flags; | |
176 | int (*f)(int, Buffer *); | |
177 | }; | |
178 | ||
179 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
180 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
181 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
182 | ||
183 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
184 | ||
185 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
186 | ||
187 | struct mon_table mon_dispatch_proto20[] = { | |
188 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
189 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
190 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
191 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 192 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 193 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 194 | #ifdef USE_PAM |
195 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 196 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 197 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
198 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
199 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
200 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 201 | #endif |
6039eeef | 202 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 203 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 204 | #endif |
1853d1ef | 205 | #ifdef BSD_AUTH |
206 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 207 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 208 | #endif |
209 | #ifdef SKEY | |
210 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
211 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
212 | #endif | |
213 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
214 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 215 | #ifdef GSSAPI |
216 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
217 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
218 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 219 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 220 | #endif |
1853d1ef | 221 | {0, 0, NULL} |
222 | }; | |
223 | ||
224 | struct mon_table mon_dispatch_postauth20[] = { | |
225 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
226 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
227 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
228 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
229 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 230 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 231 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
232 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
233 | #endif | |
1853d1ef | 234 | {0, 0, NULL} |
235 | }; | |
236 | ||
237 | struct mon_table mon_dispatch_proto15[] = { | |
238 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
239 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
240 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
241 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
242 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
243 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
244 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
245 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
246 | #ifdef BSD_AUTH | |
247 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 248 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 249 | #endif |
250 | #ifdef SKEY | |
251 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
252 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 253 | #endif |
254 | #ifdef USE_PAM | |
255 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 256 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 257 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
258 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
259 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
260 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 261 | #endif |
6039eeef | 262 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 263 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 264 | #endif |
265 | {0, 0, NULL} | |
266 | }; | |
267 | ||
268 | struct mon_table mon_dispatch_postauth15[] = { | |
269 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
270 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
271 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 272 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 273 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 274 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 275 | #endif |
1853d1ef | 276 | {0, 0, NULL} |
277 | }; | |
278 | ||
279 | struct mon_table *mon_dispatch; | |
280 | ||
281 | /* Specifies if a certain message is allowed at the moment */ | |
282 | ||
283 | static void | |
284 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
285 | { | |
286 | while (ent->f != NULL) { | |
287 | if (ent->type == type) { | |
288 | ent->flags &= ~MON_PERMIT; | |
289 | ent->flags |= permit ? MON_PERMIT : 0; | |
290 | return; | |
291 | } | |
292 | ent++; | |
293 | } | |
294 | } | |
295 | ||
296 | static void | |
297 | monitor_permit_authentications(int permit) | |
298 | { | |
299 | struct mon_table *ent = mon_dispatch; | |
300 | ||
301 | while (ent->f != NULL) { | |
302 | if (ent->flags & MON_AUTH) { | |
303 | ent->flags &= ~MON_PERMIT; | |
304 | ent->flags |= permit ? MON_PERMIT : 0; | |
305 | } | |
306 | ent++; | |
307 | } | |
308 | } | |
309 | ||
2362db19 | 310 | void |
311 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 312 | { |
313 | struct mon_table *ent; | |
314 | int authenticated = 0; | |
315 | ||
316 | debug3("preauth child monitor started"); | |
317 | ||
2362db19 | 318 | authctxt = _authctxt; |
319 | memset(authctxt, 0, sizeof(*authctxt)); | |
320 | ||
e05df884 | 321 | authctxt->loginmsg = &loginmsg; |
322 | ||
1853d1ef | 323 | if (compat20) { |
324 | mon_dispatch = mon_dispatch_proto20; | |
325 | ||
326 | /* Permit requests for moduli and signatures */ | |
327 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
328 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
329 | } else { | |
330 | mon_dispatch = mon_dispatch_proto15; | |
331 | ||
332 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
333 | } | |
334 | ||
1853d1ef | 335 | /* The first few requests do not require asynchronous access */ |
336 | while (!authenticated) { | |
b5a28cbc | 337 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 338 | if (authenticated) { |
339 | if (!(ent->flags & MON_AUTHDECIDE)) | |
340 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 341 | __func__, ent->type); |
1853d1ef | 342 | if (authctxt->pw->pw_uid == 0 && |
343 | !auth_root_allowed(auth_method)) | |
344 | authenticated = 0; | |
5b9e2464 | 345 | #ifdef USE_PAM |
346 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 347 | if (options.use_pam && authenticated) { |
5b9e2464 | 348 | Buffer m; |
349 | ||
350 | buffer_init(&m); | |
aff51935 | 351 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 352 | MONITOR_REQ_PAM_ACCOUNT, &m); |
353 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
354 | buffer_free(&m); | |
355 | } | |
356 | #endif | |
1853d1ef | 357 | } |
358 | ||
359 | if (ent->flags & MON_AUTHDECIDE) { | |
360 | auth_log(authctxt, authenticated, auth_method, | |
361 | compat20 ? " ssh2" : ""); | |
362 | if (!authenticated) | |
363 | authctxt->failures++; | |
364 | } | |
365 | } | |
366 | ||
367 | if (!authctxt->valid) | |
1588c277 | 368 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 369 | |
370 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 371 | __func__, authctxt->user); |
1853d1ef | 372 | |
b5a28cbc | 373 | mm_get_keystate(pmonitor); |
1853d1ef | 374 | } |
375 | ||
3a39206f | 376 | static void |
377 | monitor_set_child_handler(pid_t pid) | |
378 | { | |
379 | monitor_child_pid = pid; | |
380 | } | |
381 | ||
382 | static void | |
ca75d7de | 383 | monitor_child_handler(int sig) |
3a39206f | 384 | { |
ca75d7de | 385 | kill(monitor_child_pid, sig); |
3a39206f | 386 | } |
387 | ||
1853d1ef | 388 | void |
b5a28cbc | 389 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 390 | { |
3a39206f | 391 | monitor_set_child_handler(pmonitor->m_pid); |
392 | signal(SIGHUP, &monitor_child_handler); | |
393 | signal(SIGTERM, &monitor_child_handler); | |
394 | ||
1853d1ef | 395 | if (compat20) { |
396 | mon_dispatch = mon_dispatch_postauth20; | |
397 | ||
398 | /* Permit requests for moduli and signatures */ | |
399 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
400 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
401 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 402 | } else { |
403 | mon_dispatch = mon_dispatch_postauth15; | |
404 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
405 | } | |
406 | if (!no_pty_flag) { | |
407 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
408 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
409 | } | |
410 | ||
411 | for (;;) | |
b5a28cbc | 412 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 413 | } |
414 | ||
415 | void | |
b5a28cbc | 416 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 417 | { |
0496cf34 | 418 | if (options.compression) { |
419 | /* The member allocation is not visible, so sync it */ | |
420 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
421 | } | |
1853d1ef | 422 | } |
423 | ||
424 | int | |
b5a28cbc | 425 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 426 | struct mon_table **pent) |
427 | { | |
428 | Buffer m; | |
429 | int ret; | |
430 | u_char type; | |
431 | ||
432 | buffer_init(&m); | |
433 | ||
b5a28cbc | 434 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 435 | type = buffer_get_char(&m); |
436 | ||
1588c277 | 437 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 438 | |
439 | while (ent->f != NULL) { | |
440 | if (ent->type == type) | |
441 | break; | |
442 | ent++; | |
443 | } | |
444 | ||
445 | if (ent->f != NULL) { | |
446 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 447 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 448 | type); |
b5a28cbc | 449 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 450 | buffer_free(&m); |
451 | ||
452 | /* The child may use this request only once, disable it */ | |
453 | if (ent->flags & MON_ONCE) { | |
1588c277 | 454 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 455 | type); |
456 | ent->flags &= ~MON_PERMIT; | |
457 | } | |
458 | ||
459 | if (pent != NULL) | |
460 | *pent = ent; | |
461 | ||
462 | return ret; | |
463 | } | |
464 | ||
1588c277 | 465 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 466 | |
467 | /* NOTREACHED */ | |
468 | return (-1); | |
469 | } | |
470 | ||
471 | /* allowed key state */ | |
472 | static int | |
473 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
474 | { | |
475 | /* make sure key is allowed */ | |
476 | if (key_blob == NULL || key_bloblen != bloblen || | |
477 | memcmp(key_blob, blob, key_bloblen)) | |
478 | return (0); | |
479 | return (1); | |
480 | } | |
481 | ||
482 | static void | |
483 | monitor_reset_key_state(void) | |
484 | { | |
485 | /* reset state */ | |
486 | if (key_blob != NULL) | |
487 | xfree(key_blob); | |
488 | if (hostbased_cuser != NULL) | |
489 | xfree(hostbased_cuser); | |
490 | if (hostbased_chost != NULL) | |
491 | xfree(hostbased_chost); | |
492 | key_blob = NULL; | |
493 | key_bloblen = 0; | |
494 | key_blobtype = MM_NOKEY; | |
495 | hostbased_cuser = NULL; | |
496 | hostbased_chost = NULL; | |
497 | } | |
498 | ||
499 | int | |
ca75d7de | 500 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 501 | { |
502 | DH *dh; | |
503 | int min, want, max; | |
504 | ||
505 | min = buffer_get_int(m); | |
506 | want = buffer_get_int(m); | |
507 | max = buffer_get_int(m); | |
508 | ||
509 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 510 | __func__, min, want, max); |
1853d1ef | 511 | /* We need to check here, too, in case the child got corrupted */ |
512 | if (max < min || want < min || max < want) | |
513 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 514 | __func__, min, want, max); |
1853d1ef | 515 | |
516 | buffer_clear(m); | |
517 | ||
518 | dh = choose_dh(min, want, max); | |
519 | if (dh == NULL) { | |
520 | buffer_put_char(m, 0); | |
521 | return (0); | |
522 | } else { | |
523 | /* Send first bignum */ | |
524 | buffer_put_char(m, 1); | |
525 | buffer_put_bignum2(m, dh->p); | |
526 | buffer_put_bignum2(m, dh->g); | |
527 | ||
528 | DH_free(dh); | |
529 | } | |
ca75d7de | 530 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 531 | return (0); |
532 | } | |
533 | ||
534 | int | |
ca75d7de | 535 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 536 | { |
537 | Key *key; | |
538 | u_char *p; | |
539 | u_char *signature; | |
540 | u_int siglen, datlen; | |
541 | int keyid; | |
542 | ||
1588c277 | 543 | debug3("%s", __func__); |
1853d1ef | 544 | |
545 | keyid = buffer_get_int(m); | |
546 | p = buffer_get_string(m, &datlen); | |
547 | ||
2ff8003a | 548 | /* |
549 | * Supported KEX types will only return SHA1 (20 byte) or | |
550 | * SHA256 (32 byte) hashes | |
551 | */ | |
552 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 553 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 554 | |
521d606b | 555 | /* save session id, it will be passed on the first call */ |
556 | if (session_id2_len == 0) { | |
557 | session_id2_len = datlen; | |
558 | session_id2 = xmalloc(session_id2_len); | |
559 | memcpy(session_id2, p, session_id2_len); | |
560 | } | |
561 | ||
1853d1ef | 562 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 563 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 564 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 565 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 566 | |
d1ff09ba | 567 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 568 | |
569 | buffer_clear(m); | |
570 | buffer_put_string(m, signature, siglen); | |
571 | ||
572 | xfree(p); | |
573 | xfree(signature); | |
574 | ||
ca75d7de | 575 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 576 | |
577 | /* Turn on permissions for getpwnam */ | |
578 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
579 | ||
580 | return (0); | |
581 | } | |
582 | ||
583 | /* Retrieves the password entry and also checks if the user is permitted */ | |
584 | ||
585 | int | |
ca75d7de | 586 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 587 | { |
18a8f313 | 588 | char *username; |
1853d1ef | 589 | struct passwd *pwent; |
590 | int allowed = 0; | |
591 | ||
1588c277 | 592 | debug3("%s", __func__); |
1853d1ef | 593 | |
594 | if (authctxt->attempt++ != 0) | |
1588c277 | 595 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 596 | |
18a8f313 | 597 | username = buffer_get_string(m, NULL); |
1853d1ef | 598 | |
18a8f313 | 599 | pwent = getpwnamallow(username); |
1853d1ef | 600 | |
18a8f313 | 601 | authctxt->user = xstrdup(username); |
602 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
603 | xfree(username); | |
1853d1ef | 604 | |
605 | buffer_clear(m); | |
606 | ||
607 | if (pwent == NULL) { | |
608 | buffer_put_char(m, 0); | |
b2a5802b | 609 | authctxt->pw = fakepw(); |
1853d1ef | 610 | goto out; |
611 | } | |
612 | ||
613 | allowed = 1; | |
614 | authctxt->pw = pwent; | |
615 | authctxt->valid = 1; | |
616 | ||
617 | buffer_put_char(m, 1); | |
618 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
619 | buffer_put_cstring(m, pwent->pw_name); | |
620 | buffer_put_cstring(m, "*"); | |
621 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 622 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 623 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 624 | #endif |
1853d1ef | 625 | buffer_put_cstring(m, pwent->pw_dir); |
626 | buffer_put_cstring(m, pwent->pw_shell); | |
627 | ||
628 | out: | |
1588c277 | 629 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 630 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 631 | |
632 | /* For SSHv1 allow authentication now */ | |
633 | if (!compat20) | |
634 | monitor_permit_authentications(1); | |
94a73cdc | 635 | else { |
1853d1ef | 636 | /* Allow service/style information on the auth context */ |
637 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 638 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
639 | } | |
1853d1ef | 640 | |
efe44db6 | 641 | #ifdef USE_PAM |
7fceb20d | 642 | if (options.use_pam) |
643 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 644 | #endif |
6039eeef | 645 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 646 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 647 | #endif |
1853d1ef | 648 | |
649 | return (0); | |
650 | } | |
651 | ||
ca75d7de | 652 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 653 | { |
654 | char *banner; | |
655 | ||
656 | buffer_clear(m); | |
657 | banner = auth2_read_banner(); | |
658 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 659 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 660 | |
661 | if (banner != NULL) | |
30e37ee6 | 662 | xfree(banner); |
94a73cdc | 663 | |
664 | return (0); | |
665 | } | |
666 | ||
1853d1ef | 667 | int |
ca75d7de | 668 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 669 | { |
670 | monitor_permit_authentications(1); | |
671 | ||
672 | authctxt->service = buffer_get_string(m, NULL); | |
673 | authctxt->style = buffer_get_string(m, NULL); | |
674 | debug3("%s: service=%s, style=%s", | |
1588c277 | 675 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 676 | |
677 | if (strlen(authctxt->style) == 0) { | |
678 | xfree(authctxt->style); | |
679 | authctxt->style = NULL; | |
680 | } | |
681 | ||
682 | return (0); | |
683 | } | |
684 | ||
685 | int | |
ca75d7de | 686 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 687 | { |
688 | static int call_count; | |
689 | char *passwd; | |
d341742a | 690 | int authenticated; |
691 | u_int plen; | |
1853d1ef | 692 | |
693 | passwd = buffer_get_string(m, &plen); | |
694 | /* Only authenticate if the context is valid */ | |
aa586f8e | 695 | authenticated = options.password_authentication && |
96d0bf74 | 696 | auth_password(authctxt, passwd); |
1853d1ef | 697 | memset(passwd, 0, strlen(passwd)); |
698 | xfree(passwd); | |
699 | ||
700 | buffer_clear(m); | |
701 | buffer_put_int(m, authenticated); | |
702 | ||
1588c277 | 703 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 704 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 705 | |
706 | call_count++; | |
707 | if (plen == 0 && call_count == 1) | |
708 | auth_method = "none"; | |
709 | else | |
710 | auth_method = "password"; | |
711 | ||
712 | /* Causes monitor loop to terminate if authenticated */ | |
713 | return (authenticated); | |
714 | } | |
715 | ||
716 | #ifdef BSD_AUTH | |
717 | int | |
ca75d7de | 718 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 719 | { |
720 | char *name, *infotxt; | |
721 | u_int numprompts; | |
722 | u_int *echo_on; | |
723 | char **prompts; | |
6d6c25e3 | 724 | u_int success; |
1853d1ef | 725 | |
6d6c25e3 | 726 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
727 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 728 | |
729 | buffer_clear(m); | |
6d6c25e3 | 730 | buffer_put_int(m, success); |
731 | if (success) | |
1853d1ef | 732 | buffer_put_cstring(m, prompts[0]); |
733 | ||
6d6c25e3 | 734 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 735 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 736 | |
6d6c25e3 | 737 | if (success) { |
1853d1ef | 738 | xfree(name); |
739 | xfree(infotxt); | |
740 | xfree(prompts); | |
741 | xfree(echo_on); | |
742 | } | |
743 | ||
744 | return (0); | |
745 | } | |
746 | ||
747 | int | |
ca75d7de | 748 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 749 | { |
750 | char *response; | |
751 | int authok; | |
752 | ||
753 | if (authctxt->as == 0) | |
1588c277 | 754 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 755 | |
756 | response = buffer_get_string(m, NULL); | |
aa586f8e | 757 | authok = options.challenge_response_authentication && |
758 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 759 | authctxt->as = NULL; |
1588c277 | 760 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 761 | xfree(response); |
762 | ||
763 | buffer_clear(m); | |
764 | buffer_put_int(m, authok); | |
765 | ||
1588c277 | 766 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 767 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 768 | |
769 | auth_method = "bsdauth"; | |
770 | ||
771 | return (authok != 0); | |
772 | } | |
773 | #endif | |
774 | ||
775 | #ifdef SKEY | |
776 | int | |
ca75d7de | 777 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 778 | { |
779 | struct skey skey; | |
780 | char challenge[1024]; | |
6d6c25e3 | 781 | u_int success; |
1853d1ef | 782 | |
f2b7b5c8 | 783 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
784 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 785 | |
786 | buffer_clear(m); | |
6d6c25e3 | 787 | buffer_put_int(m, success); |
788 | if (success) | |
1853d1ef | 789 | buffer_put_cstring(m, challenge); |
790 | ||
6d6c25e3 | 791 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 792 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 793 | |
794 | return (0); | |
795 | } | |
796 | ||
797 | int | |
ca75d7de | 798 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 799 | { |
800 | char *response; | |
801 | int authok; | |
802 | ||
803 | response = buffer_get_string(m, NULL); | |
804 | ||
aa586f8e | 805 | authok = (options.challenge_response_authentication && |
806 | authctxt->valid && | |
1853d1ef | 807 | skey_haskey(authctxt->pw->pw_name) == 0 && |
808 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
809 | ||
810 | xfree(response); | |
811 | ||
812 | buffer_clear(m); | |
813 | buffer_put_int(m, authok); | |
814 | ||
1588c277 | 815 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 816 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 817 | |
818 | auth_method = "skey"; | |
819 | ||
820 | return (authok != 0); | |
821 | } | |
822 | #endif | |
823 | ||
ad200abb | 824 | #ifdef USE_PAM |
825 | int | |
8b3ec5fd | 826 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 827 | { |
7fceb20d | 828 | if (!options.use_pam) |
829 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
830 | ||
529d73ab | 831 | start_pam(authctxt); |
ad200abb | 832 | |
5b9e2464 | 833 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
834 | ||
ad200abb | 835 | return (0); |
836 | } | |
05114c74 | 837 | |
5b9e2464 | 838 | int |
8b3ec5fd | 839 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 840 | { |
841 | u_int ret; | |
b6453d99 | 842 | |
5b9e2464 | 843 | if (!options.use_pam) |
844 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
845 | ||
846 | ret = do_pam_account(); | |
847 | ||
848 | buffer_put_int(m, ret); | |
cfb60d3a | 849 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 850 | |
8b3ec5fd | 851 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 852 | |
853 | return (ret); | |
854 | } | |
855 | ||
05114c74 | 856 | static void *sshpam_ctxt, *sshpam_authok; |
857 | extern KbdintDevice sshpam_device; | |
858 | ||
859 | int | |
8b3ec5fd | 860 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 861 | { |
862 | ||
863 | debug3("%s", __func__); | |
864 | authctxt->user = buffer_get_string(m, NULL); | |
865 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
866 | sshpam_authok = NULL; | |
867 | buffer_clear(m); | |
868 | if (sshpam_ctxt != NULL) { | |
869 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
870 | buffer_put_int(m, 1); | |
871 | } else { | |
872 | buffer_put_int(m, 0); | |
873 | } | |
8b3ec5fd | 874 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 875 | return (0); |
876 | } | |
877 | ||
878 | int | |
8b3ec5fd | 879 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 880 | { |
881 | char *name, *info, **prompts; | |
a1a073cc | 882 | u_int i, num, *echo_on; |
883 | int ret; | |
05114c74 | 884 | |
885 | debug3("%s", __func__); | |
886 | sshpam_authok = NULL; | |
887 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
888 | if (ret == 0 && num == 0) | |
889 | sshpam_authok = sshpam_ctxt; | |
890 | if (num > 1 || name == NULL || info == NULL) | |
891 | ret = -1; | |
892 | buffer_clear(m); | |
893 | buffer_put_int(m, ret); | |
894 | buffer_put_cstring(m, name); | |
895 | xfree(name); | |
896 | buffer_put_cstring(m, info); | |
897 | xfree(info); | |
898 | buffer_put_int(m, num); | |
899 | for (i = 0; i < num; ++i) { | |
900 | buffer_put_cstring(m, prompts[i]); | |
901 | xfree(prompts[i]); | |
902 | buffer_put_int(m, echo_on[i]); | |
903 | } | |
904 | if (prompts != NULL) | |
905 | xfree(prompts); | |
906 | if (echo_on != NULL) | |
907 | xfree(echo_on); | |
8b3ec5fd | 908 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 909 | return (0); |
910 | } | |
911 | ||
912 | int | |
8b3ec5fd | 913 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 914 | { |
915 | char **resp; | |
a1a073cc | 916 | u_int i, num; |
917 | int ret; | |
05114c74 | 918 | |
919 | debug3("%s", __func__); | |
920 | sshpam_authok = NULL; | |
921 | num = buffer_get_int(m); | |
922 | if (num > 0) { | |
923 | resp = xmalloc(num * sizeof(char *)); | |
924 | for (i = 0; i < num; ++i) | |
925 | resp[i] = buffer_get_string(m, NULL); | |
926 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
927 | for (i = 0; i < num; ++i) | |
928 | xfree(resp[i]); | |
929 | xfree(resp); | |
930 | } else { | |
931 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
932 | } | |
933 | buffer_clear(m); | |
934 | buffer_put_int(m, ret); | |
8b3ec5fd | 935 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 936 | auth_method = "keyboard-interactive/pam"; |
937 | if (ret == 0) | |
938 | sshpam_authok = sshpam_ctxt; | |
939 | return (0); | |
940 | } | |
941 | ||
942 | int | |
8b3ec5fd | 943 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 944 | { |
945 | ||
946 | debug3("%s", __func__); | |
947 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
948 | buffer_clear(m); | |
8b3ec5fd | 949 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
05114c74 | 950 | return (sshpam_authok == sshpam_ctxt); |
951 | } | |
ad200abb | 952 | #endif |
953 | ||
1853d1ef | 954 | static void |
955 | mm_append_debug(Buffer *m) | |
956 | { | |
957 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 958 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 959 | buffer_append(m, buffer_ptr(&auth_debug), |
960 | buffer_len(&auth_debug)); | |
961 | buffer_clear(&auth_debug); | |
962 | } | |
963 | } | |
964 | ||
965 | int | |
ca75d7de | 966 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 967 | { |
968 | Key *key; | |
661e45a0 | 969 | char *cuser, *chost; |
970 | u_char *blob; | |
1853d1ef | 971 | u_int bloblen; |
972 | enum mm_keytype type = 0; | |
973 | int allowed = 0; | |
974 | ||
1588c277 | 975 | debug3("%s entering", __func__); |
1853d1ef | 976 | |
977 | type = buffer_get_int(m); | |
978 | cuser = buffer_get_string(m, NULL); | |
979 | chost = buffer_get_string(m, NULL); | |
980 | blob = buffer_get_string(m, &bloblen); | |
981 | ||
982 | key = key_from_blob(blob, bloblen); | |
983 | ||
984 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
985 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 986 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 987 | |
1588c277 | 988 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 989 | |
fdaef11e | 990 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 991 | switch (type) { |
1853d1ef | 992 | case MM_USERKEY: |
aa586f8e | 993 | allowed = options.pubkey_authentication && |
994 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 995 | break; |
996 | case MM_HOSTKEY: | |
aa586f8e | 997 | allowed = options.hostbased_authentication && |
998 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 999 | cuser, chost, key); |
1000 | break; | |
1001 | case MM_RSAHOSTKEY: | |
1002 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1003 | allowed = options.rhosts_rsa_authentication && |
1004 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1005 | cuser, chost, key); |
1006 | break; | |
1007 | default: | |
1588c277 | 1008 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1009 | break; |
1010 | } | |
1853d1ef | 1011 | } |
3e2f2431 | 1012 | if (key != NULL) |
1013 | key_free(key); | |
1853d1ef | 1014 | |
1015 | /* clear temporarily storage (used by verify) */ | |
1016 | monitor_reset_key_state(); | |
1017 | ||
1018 | if (allowed) { | |
1019 | /* Save temporarily for comparison in verify */ | |
1020 | key_blob = blob; | |
1021 | key_bloblen = bloblen; | |
1022 | key_blobtype = type; | |
1023 | hostbased_cuser = cuser; | |
1024 | hostbased_chost = chost; | |
1025 | } | |
1026 | ||
1027 | debug3("%s: key %p is %s", | |
1588c277 | 1028 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1029 | |
1030 | buffer_clear(m); | |
1031 | buffer_put_int(m, allowed); | |
92e15201 | 1032 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1033 | |
1034 | mm_append_debug(m); | |
1035 | ||
ca75d7de | 1036 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1037 | |
1038 | if (type == MM_RSAHOSTKEY) | |
1039 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1040 | ||
1041 | return (0); | |
1042 | } | |
1043 | ||
1044 | static int | |
1045 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1046 | { | |
1047 | Buffer b; | |
661e45a0 | 1048 | char *p; |
1853d1ef | 1049 | u_int len; |
1050 | int fail = 0; | |
1853d1ef | 1051 | |
1052 | buffer_init(&b); | |
1053 | buffer_append(&b, data, datalen); | |
1054 | ||
1055 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1056 | p = buffer_ptr(&b); |
1057 | len = buffer_len(&b); | |
1058 | if ((session_id2 == NULL) || | |
1059 | (len < session_id2_len) || | |
1060 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1061 | fail++; | |
1853d1ef | 1062 | buffer_consume(&b, session_id2_len); |
1063 | } else { | |
521d606b | 1064 | p = buffer_get_string(&b, &len); |
1065 | if ((session_id2 == NULL) || | |
1066 | (len != session_id2_len) || | |
1067 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1068 | fail++; |
521d606b | 1069 | xfree(p); |
1853d1ef | 1070 | } |
1071 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1072 | fail++; | |
1073 | p = buffer_get_string(&b, NULL); | |
1074 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1075 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1076 | authctxt->user, p); |
1077 | fail++; | |
1078 | } | |
1079 | xfree(p); | |
1080 | buffer_skip_string(&b); | |
1081 | if (datafellows & SSH_BUG_PKAUTH) { | |
1082 | if (!buffer_get_char(&b)) | |
1083 | fail++; | |
1084 | } else { | |
1085 | p = buffer_get_string(&b, NULL); | |
1086 | if (strcmp("publickey", p) != 0) | |
1087 | fail++; | |
1088 | xfree(p); | |
1089 | if (!buffer_get_char(&b)) | |
1090 | fail++; | |
1091 | buffer_skip_string(&b); | |
1092 | } | |
1093 | buffer_skip_string(&b); | |
1094 | if (buffer_len(&b) != 0) | |
1095 | fail++; | |
1096 | buffer_free(&b); | |
1097 | return (fail == 0); | |
1098 | } | |
1099 | ||
1100 | static int | |
661e45a0 | 1101 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1102 | char *chost) | |
1853d1ef | 1103 | { |
1104 | Buffer b; | |
661e45a0 | 1105 | char *p; |
1853d1ef | 1106 | u_int len; |
1107 | int fail = 0; | |
1853d1ef | 1108 | |
1109 | buffer_init(&b); | |
1110 | buffer_append(&b, data, datalen); | |
1111 | ||
521d606b | 1112 | p = buffer_get_string(&b, &len); |
1113 | if ((session_id2 == NULL) || | |
1114 | (len != session_id2_len) || | |
1115 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1116 | fail++; |
521d606b | 1117 | xfree(p); |
1118 | ||
1853d1ef | 1119 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1120 | fail++; | |
1121 | p = buffer_get_string(&b, NULL); | |
1122 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1123 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1124 | authctxt->user, p); |
1125 | fail++; | |
1126 | } | |
1127 | xfree(p); | |
1128 | buffer_skip_string(&b); /* service */ | |
1129 | p = buffer_get_string(&b, NULL); | |
1130 | if (strcmp(p, "hostbased") != 0) | |
1131 | fail++; | |
1132 | xfree(p); | |
1133 | buffer_skip_string(&b); /* pkalg */ | |
1134 | buffer_skip_string(&b); /* pkblob */ | |
1135 | ||
1136 | /* verify client host, strip trailing dot if necessary */ | |
1137 | p = buffer_get_string(&b, NULL); | |
1138 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1139 | p[len - 1] = '\0'; | |
1140 | if (strcmp(p, chost) != 0) | |
1141 | fail++; | |
1142 | xfree(p); | |
1143 | ||
1144 | /* verify client user */ | |
1145 | p = buffer_get_string(&b, NULL); | |
1146 | if (strcmp(p, cuser) != 0) | |
1147 | fail++; | |
1148 | xfree(p); | |
1149 | ||
1150 | if (buffer_len(&b) != 0) | |
1151 | fail++; | |
1152 | buffer_free(&b); | |
1153 | return (fail == 0); | |
1154 | } | |
1155 | ||
1156 | int | |
ca75d7de | 1157 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1158 | { |
1159 | Key *key; | |
1160 | u_char *signature, *data, *blob; | |
1161 | u_int signaturelen, datalen, bloblen; | |
1162 | int verified = 0; | |
1163 | int valid_data = 0; | |
1164 | ||
1165 | blob = buffer_get_string(m, &bloblen); | |
1166 | signature = buffer_get_string(m, &signaturelen); | |
1167 | data = buffer_get_string(m, &datalen); | |
1168 | ||
1169 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1170 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1171 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1172 | |
1173 | key = key_from_blob(blob, bloblen); | |
1174 | if (key == NULL) | |
1588c277 | 1175 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1176 | |
1177 | switch (key_blobtype) { | |
1178 | case MM_USERKEY: | |
1179 | valid_data = monitor_valid_userblob(data, datalen); | |
1180 | break; | |
1181 | case MM_HOSTKEY: | |
1182 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1183 | hostbased_cuser, hostbased_chost); | |
1184 | break; | |
1185 | default: | |
1186 | valid_data = 0; | |
1187 | break; | |
1188 | } | |
1189 | if (!valid_data) | |
1588c277 | 1190 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1191 | |
1192 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1193 | debug3("%s: key %p signature %s", | |
1588c277 | 1194 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1195 | |
1196 | key_free(key); | |
1197 | xfree(blob); | |
1198 | xfree(signature); | |
1199 | xfree(data); | |
1200 | ||
d17ef027 | 1201 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1202 | ||
1853d1ef | 1203 | monitor_reset_key_state(); |
1204 | ||
1205 | buffer_clear(m); | |
1206 | buffer_put_int(m, verified); | |
ca75d7de | 1207 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1208 | |
1853d1ef | 1209 | return (verified); |
1210 | } | |
1211 | ||
1212 | static void | |
1213 | mm_record_login(Session *s, struct passwd *pw) | |
1214 | { | |
1215 | socklen_t fromlen; | |
1216 | struct sockaddr_storage from; | |
1217 | ||
1218 | /* | |
1219 | * Get IP address of client. If the connection is not a socket, let | |
1220 | * the address be 0.0.0.0. | |
1221 | */ | |
1222 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1223 | fromlen = sizeof(from); |
1853d1ef | 1224 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1225 | if (getpeername(packet_get_connection_in(), |
1226 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1227 | debug("getpeername: %.100s", strerror(errno)); | |
2362db19 | 1228 | cleanup_exit(255); |
1853d1ef | 1229 | } |
1230 | } | |
1231 | /* Record that there was a login on that tty from the remote host. */ | |
1232 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1233 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1234 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1235 | } |
1236 | ||
1237 | static void | |
1238 | mm_session_close(Session *s) | |
1239 | { | |
b9ed513a | 1240 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1241 | if (s->ttyfd != -1) { |
1588c277 | 1242 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1243 | session_pty_cleanup2(s); |
1244 | } | |
1245 | s->used = 0; | |
1246 | } | |
1247 | ||
1248 | int | |
ca75d7de | 1249 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1250 | { |
b5a28cbc | 1251 | extern struct monitor *pmonitor; |
1853d1ef | 1252 | Session *s; |
1253 | int res, fd0; | |
1254 | ||
1588c277 | 1255 | debug3("%s entering", __func__); |
1853d1ef | 1256 | |
1257 | buffer_clear(m); | |
1258 | s = session_new(); | |
1259 | if (s == NULL) | |
1260 | goto error; | |
1261 | s->authctxt = authctxt; | |
1262 | s->pw = authctxt->pw; | |
b5a28cbc | 1263 | s->pid = pmonitor->m_pid; |
1853d1ef | 1264 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1265 | if (res == 0) | |
1266 | goto error; | |
1853d1ef | 1267 | pty_setowner(authctxt->pw, s->tty); |
1268 | ||
1269 | buffer_put_int(m, 1); | |
1270 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1271 | |
1272 | /* We need to trick ttyslot */ | |
1273 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1274 | fatal("%s: dup2", __func__); |
1853d1ef | 1275 | |
1276 | mm_record_login(s, authctxt->pw); | |
1277 | ||
1278 | /* Now we can close the file descriptor again */ | |
1279 | close(0); | |
1280 | ||
be2ca0c9 | 1281 | /* send messages generated by record_login */ |
1282 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1283 | buffer_clear(&loginmsg); | |
1284 | ||
1285 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1286 | ||
1287 | mm_send_fd(sock, s->ptyfd); | |
1288 | mm_send_fd(sock, s->ttyfd); | |
1289 | ||
1853d1ef | 1290 | /* make sure nothing uses fd 0 */ |
1291 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1292 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1293 | if (fd0 != 0) |
1588c277 | 1294 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1295 | |
1296 | /* slave is not needed */ | |
1297 | close(s->ttyfd); | |
1298 | s->ttyfd = s->ptyfd; | |
1299 | /* no need to dup() because nobody closes ptyfd */ | |
1300 | s->ptymaster = s->ptyfd; | |
1301 | ||
1588c277 | 1302 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1303 | |
1304 | return (0); | |
1305 | ||
1306 | error: | |
1307 | if (s != NULL) | |
1308 | mm_session_close(s); | |
1309 | buffer_put_int(m, 0); | |
ca75d7de | 1310 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1311 | return (0); |
1312 | } | |
1313 | ||
1314 | int | |
ca75d7de | 1315 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1316 | { |
1317 | Session *s; | |
1318 | char *tty; | |
1319 | ||
1588c277 | 1320 | debug3("%s entering", __func__); |
1853d1ef | 1321 | |
1322 | tty = buffer_get_string(m, NULL); | |
1323 | if ((s = session_by_tty(tty)) != NULL) | |
1324 | mm_session_close(s); | |
1325 | buffer_clear(m); | |
1326 | xfree(tty); | |
1327 | return (0); | |
1328 | } | |
1329 | ||
1330 | int | |
ca75d7de | 1331 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1332 | { |
1333 | BIGNUM *p; | |
1334 | int rsafail; | |
1335 | ||
1336 | /* Turn off permissions */ | |
75cccc2c | 1337 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1338 | |
1339 | if ((p = BN_new()) == NULL) | |
1588c277 | 1340 | fatal("%s: BN_new", __func__); |
1853d1ef | 1341 | |
1342 | buffer_get_bignum2(m, p); | |
1343 | ||
1344 | rsafail = ssh1_session_key(p); | |
1345 | ||
1346 | buffer_clear(m); | |
1347 | buffer_put_int(m, rsafail); | |
1348 | buffer_put_bignum2(m, p); | |
1349 | ||
1350 | BN_clear_free(p); | |
1351 | ||
ca75d7de | 1352 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1353 | |
1354 | /* Turn on permissions for sessid passing */ | |
1355 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1356 | ||
1357 | return (0); | |
1358 | } | |
1359 | ||
1360 | int | |
ca75d7de | 1361 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1362 | { |
1363 | int i; | |
1364 | ||
1588c277 | 1365 | debug3("%s entering", __func__); |
1853d1ef | 1366 | |
1367 | if (buffer_len(m) != 16) | |
1588c277 | 1368 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1369 | for (i = 0; i < 16; i++) |
1370 | session_id[i] = buffer_get_char(m); | |
1371 | ||
1372 | /* Turn on permissions for getpwnam */ | |
1373 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1374 | ||
1375 | return (0); | |
1376 | } | |
1377 | ||
1378 | int | |
ca75d7de | 1379 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1380 | { |
1381 | BIGNUM *client_n; | |
1382 | Key *key = NULL; | |
1383 | u_char *blob = NULL; | |
1384 | u_int blen = 0; | |
1385 | int allowed = 0; | |
1386 | ||
1588c277 | 1387 | debug3("%s entering", __func__); |
1853d1ef | 1388 | |
aa586f8e | 1389 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1390 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1391 | fatal("%s: BN_new", __func__); |
1853d1ef | 1392 | buffer_get_bignum2(m, client_n); |
1393 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1394 | BN_clear_free(client_n); | |
1395 | } | |
1396 | buffer_clear(m); | |
1397 | buffer_put_int(m, allowed); | |
92e15201 | 1398 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1399 | |
1400 | /* clear temporarily storage (used by generate challenge) */ | |
1401 | monitor_reset_key_state(); | |
1402 | ||
1403 | if (allowed && key != NULL) { | |
1404 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1405 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1406 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1407 | buffer_put_string(m, blob, blen); |
1408 | ||
1409 | /* Save temporarily for comparison in verify */ | |
1410 | key_blob = blob; | |
1411 | key_bloblen = blen; | |
1412 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1413 | } |
3e2f2431 | 1414 | if (key != NULL) |
1415 | key_free(key); | |
1853d1ef | 1416 | |
1417 | mm_append_debug(m); | |
1418 | ||
ca75d7de | 1419 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1420 | |
1421 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1422 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1423 | return (0); | |
1424 | } | |
1425 | ||
1426 | int | |
ca75d7de | 1427 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1428 | { |
1429 | Key *key = NULL; | |
1430 | u_char *blob; | |
1431 | u_int blen; | |
1432 | ||
1588c277 | 1433 | debug3("%s entering", __func__); |
1853d1ef | 1434 | |
1435 | if (!authctxt->valid) | |
1588c277 | 1436 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1437 | blob = buffer_get_string(m, &blen); |
1438 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1439 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1440 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1441 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1442 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1443 | fatal("%s: received bad key", __func__); |
1853d1ef | 1444 | |
1445 | if (ssh1_challenge) | |
1446 | BN_clear_free(ssh1_challenge); | |
1447 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1448 | ||
1449 | buffer_clear(m); | |
1450 | buffer_put_bignum2(m, ssh1_challenge); | |
1451 | ||
1588c277 | 1452 | debug3("%s sending reply", __func__); |
ca75d7de | 1453 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1454 | |
1455 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1456 | |
1457 | xfree(blob); | |
1458 | key_free(key); | |
1853d1ef | 1459 | return (0); |
1460 | } | |
1461 | ||
1462 | int | |
ca75d7de | 1463 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1464 | { |
1465 | Key *key = NULL; | |
1466 | u_char *blob, *response; | |
1467 | u_int blen, len; | |
1468 | int success; | |
1469 | ||
1588c277 | 1470 | debug3("%s entering", __func__); |
1853d1ef | 1471 | |
1472 | if (!authctxt->valid) | |
1588c277 | 1473 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1474 | if (ssh1_challenge == NULL) |
1588c277 | 1475 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1476 | |
1477 | blob = buffer_get_string(m, &blen); | |
1478 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1479 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1480 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1481 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1482 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1483 | fatal("%s: received bad key", __func__); |
1853d1ef | 1484 | response = buffer_get_string(m, &len); |
1485 | if (len != 16) | |
1588c277 | 1486 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1487 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1488 | ||
3e2f2431 | 1489 | xfree(blob); |
1853d1ef | 1490 | key_free(key); |
1491 | xfree(response); | |
1492 | ||
1493 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1494 | ||
1495 | /* reset state */ | |
1496 | BN_clear_free(ssh1_challenge); | |
1497 | ssh1_challenge = NULL; | |
1498 | monitor_reset_key_state(); | |
1499 | ||
1500 | buffer_clear(m); | |
1501 | buffer_put_int(m, success); | |
ca75d7de | 1502 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1503 | |
1504 | return (success); | |
1505 | } | |
1506 | ||
1507 | int | |
ca75d7de | 1508 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1509 | { |
b5a28cbc | 1510 | extern struct monitor *pmonitor; |
1853d1ef | 1511 | int res, status; |
1512 | ||
1588c277 | 1513 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1514 | |
1515 | /* The child is terminating */ | |
1516 | session_destroy_all(&mm_session_close); | |
1517 | ||
b5a28cbc | 1518 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1519 | if (errno != EINTR) |
1520 | exit(1); | |
1853d1ef | 1521 | |
1522 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1523 | ||
1524 | /* Terminate process */ | |
f6be21a0 | 1525 | exit(res); |
1853d1ef | 1526 | } |
1527 | ||
6039eeef | 1528 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1529 | /* Report that an audit event occurred */ |
1530 | int | |
1531 | mm_answer_audit_event(int socket, Buffer *m) | |
1532 | { | |
1533 | ssh_audit_event_t event; | |
1534 | ||
1535 | debug3("%s entering", __func__); | |
1536 | ||
1537 | event = buffer_get_int(m); | |
c00e4d75 | 1538 | switch(event) { |
6039eeef | 1539 | case SSH_AUTH_FAIL_PUBKEY: |
1540 | case SSH_AUTH_FAIL_HOSTBASED: | |
1541 | case SSH_AUTH_FAIL_GSSAPI: | |
1542 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1543 | case SSH_LOGIN_ROOT_DENIED: | |
1544 | case SSH_CONNECTION_CLOSE: | |
1545 | case SSH_INVALID_USER: | |
c00e4d75 | 1546 | audit_event(event); |
1547 | break; | |
1548 | default: | |
1549 | fatal("Audit event type %d not permitted", event); | |
1550 | } | |
1551 | ||
1552 | return (0); | |
1553 | } | |
1554 | ||
1555 | int | |
1556 | mm_answer_audit_command(int socket, Buffer *m) | |
1557 | { | |
1558 | u_int len; | |
1559 | char *cmd; | |
1560 | ||
1561 | debug3("%s entering", __func__); | |
1562 | cmd = buffer_get_string(m, &len); | |
1563 | /* sanity check command, if so how? */ | |
1564 | audit_run_command(cmd); | |
1565 | xfree(cmd); | |
c00e4d75 | 1566 | return (0); |
1567 | } | |
6039eeef | 1568 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1569 | |
1853d1ef | 1570 | void |
b5a28cbc | 1571 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1572 | { |
1573 | if (compat20) { | |
1574 | set_newkeys(MODE_IN); | |
1575 | set_newkeys(MODE_OUT); | |
1576 | } else { | |
1853d1ef | 1577 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1578 | packet_set_encryption_key(child_state.ssh1key, |
1579 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1580 | xfree(child_state.ssh1key); | |
1853d1ef | 1581 | } |
1582 | ||
9459414c | 1583 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1584 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1585 | xfree(child_state.keyout); | |
1586 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1587 | xfree(child_state.keyin); | |
1588 | ||
1589 | if (!compat20) { | |
1590 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1591 | xfree(child_state.ivout); | |
1592 | packet_set_iv(MODE_IN, child_state.ivin); | |
1593 | xfree(child_state.ivin); | |
1594 | } | |
1595 | ||
1596 | memcpy(&incoming_stream, &child_state.incoming, | |
1597 | sizeof(incoming_stream)); | |
1598 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1599 | sizeof(outgoing_stream)); | |
1600 | ||
1601 | /* Update with new address */ | |
0496cf34 | 1602 | if (options.compression) |
1603 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1604 | |
1605 | /* Network I/O buffers */ | |
1606 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1607 | buffer_clear(&input); | |
1608 | buffer_append(&input, child_state.input, child_state.ilen); | |
1609 | memset(child_state.input, 0, child_state.ilen); | |
1610 | xfree(child_state.input); | |
1611 | ||
1612 | buffer_clear(&output); | |
1613 | buffer_append(&output, child_state.output, child_state.olen); | |
1614 | memset(child_state.output, 0, child_state.olen); | |
1615 | xfree(child_state.output); | |
1616 | } | |
1617 | ||
1618 | static Kex * | |
1619 | mm_get_kex(Buffer *m) | |
1620 | { | |
1621 | Kex *kex; | |
1622 | void *blob; | |
1623 | u_int bloblen; | |
1624 | ||
1625 | kex = xmalloc(sizeof(*kex)); | |
1626 | memset(kex, 0, sizeof(*kex)); | |
1627 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1628 | if ((session_id2 == NULL) || |
1629 | (kex->session_id_len != session_id2_len) || | |
1630 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1631 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1632 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1633 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1634 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1635 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1636 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1637 | kex->server = 1; |
1638 | kex->hostkey_type = buffer_get_int(m); | |
1639 | kex->kex_type = buffer_get_int(m); | |
1640 | blob = buffer_get_string(m, &bloblen); | |
1641 | buffer_init(&kex->my); | |
1642 | buffer_append(&kex->my, blob, bloblen); | |
1643 | xfree(blob); | |
1644 | blob = buffer_get_string(m, &bloblen); | |
1645 | buffer_init(&kex->peer); | |
1646 | buffer_append(&kex->peer, blob, bloblen); | |
1647 | xfree(blob); | |
1648 | kex->done = 1; | |
1649 | kex->flags = buffer_get_int(m); | |
1650 | kex->client_version_string = buffer_get_string(m, NULL); | |
1651 | kex->server_version_string = buffer_get_string(m, NULL); | |
1652 | kex->load_host_key=&get_hostkey_by_type; | |
1653 | kex->host_key_index=&get_hostkey_index; | |
1654 | ||
1655 | return (kex); | |
1656 | } | |
1657 | ||
1658 | /* This function requries careful sanity checking */ | |
1659 | ||
1660 | void | |
b5a28cbc | 1661 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1662 | { |
1663 | Buffer m; | |
1664 | u_char *blob, *p; | |
1665 | u_int bloblen, plen; | |
ffd7b36b | 1666 | u_int32_t seqnr, packets; |
1667 | u_int64_t blocks; | |
1853d1ef | 1668 | |
1588c277 | 1669 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1670 | |
1671 | buffer_init(&m); | |
b5a28cbc | 1672 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1673 | if (!compat20) { |
1674 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1675 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1676 | child_state.ssh1key = buffer_get_string(&m, |
1677 | &child_state.ssh1keylen); | |
1853d1ef | 1678 | child_state.ivout = buffer_get_string(&m, |
1679 | &child_state.ivoutlen); | |
1680 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1681 | goto skip; | |
1682 | } else { | |
1683 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1684 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1685 | } |
1686 | ||
1687 | blob = buffer_get_string(&m, &bloblen); | |
1688 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1689 | xfree(blob); | |
1690 | ||
1588c277 | 1691 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1692 | blob = buffer_get_string(&m, &bloblen); |
1693 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1694 | xfree(blob); | |
1695 | ||
1696 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1697 | seqnr = buffer_get_int(&m); |
1698 | blocks = buffer_get_int64(&m); | |
1699 | packets = buffer_get_int(&m); | |
1700 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1701 | seqnr = buffer_get_int(&m); | |
1702 | blocks = buffer_get_int64(&m); | |
1703 | packets = buffer_get_int(&m); | |
1704 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1705 | |
1706 | skip: | |
1707 | /* Get the key context */ | |
1708 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1709 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1710 | ||
1588c277 | 1711 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1712 | /* Get compression state */ |
1713 | p = buffer_get_string(&m, &plen); | |
1714 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1715 | fatal("%s: bad request size", __func__); |
1853d1ef | 1716 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1717 | xfree(p); | |
1718 | ||
1719 | p = buffer_get_string(&m, &plen); | |
1720 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1721 | fatal("%s: bad request size", __func__); |
1853d1ef | 1722 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1723 | xfree(p); | |
1724 | ||
1725 | /* Network I/O buffers */ | |
1588c277 | 1726 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1727 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1728 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1729 | ||
1730 | buffer_free(&m); | |
1731 | } | |
1732 | ||
1733 | ||
1734 | /* Allocation functions for zlib */ | |
1735 | void * | |
1736 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1737 | { | |
39e71188 | 1738 | size_t len = (size_t) size * ncount; |
1853d1ef | 1739 | void *address; |
1740 | ||
b85698ab | 1741 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1742 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1743 | ||
1744 | address = mm_malloc(mm, len); | |
1853d1ef | 1745 | |
1746 | return (address); | |
1747 | } | |
1748 | ||
1749 | void | |
1750 | mm_zfree(struct mm_master *mm, void *address) | |
1751 | { | |
1752 | mm_free(mm, address); | |
1753 | } | |
1754 | ||
1755 | void | |
1756 | mm_init_compression(struct mm_master *mm) | |
1757 | { | |
1758 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1759 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1760 | outgoing_stream.opaque = mm; | |
1761 | ||
1762 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1763 | incoming_stream.zfree = (free_func)mm_zfree; | |
1764 | incoming_stream.opaque = mm; | |
1765 | } | |
1766 | ||
1767 | /* XXX */ | |
1768 | ||
1769 | #define FD_CLOSEONEXEC(x) do { \ | |
1770 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1771 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1772 | } while (0) | |
1773 | ||
1774 | static void | |
1775 | monitor_socketpair(int *pair) | |
1776 | { | |
f1af2dbf | 1777 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1778 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1779 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1780 | #else |
1781 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1782 | __func__); |
f1af2dbf | 1783 | #endif |
1853d1ef | 1784 | FD_CLOSEONEXEC(pair[0]); |
1785 | FD_CLOSEONEXEC(pair[1]); | |
1786 | } | |
1787 | ||
1788 | #define MM_MEMSIZE 65536 | |
1789 | ||
1790 | struct monitor * | |
1791 | monitor_init(void) | |
1792 | { | |
1793 | struct monitor *mon; | |
1794 | int pair[2]; | |
1795 | ||
1796 | mon = xmalloc(sizeof(*mon)); | |
1797 | ||
a9b33b95 | 1798 | mon->m_pid = 0; |
1853d1ef | 1799 | monitor_socketpair(pair); |
1800 | ||
1801 | mon->m_recvfd = pair[0]; | |
1802 | mon->m_sendfd = pair[1]; | |
1803 | ||
1804 | /* Used to share zlib space across processes */ | |
0496cf34 | 1805 | if (options.compression) { |
1806 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1807 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1808 | |
0496cf34 | 1809 | /* Compression needs to share state across borders */ |
1810 | mm_init_compression(mon->m_zlib); | |
1811 | } | |
1853d1ef | 1812 | |
1813 | return mon; | |
1814 | } | |
1815 | ||
1816 | void | |
1817 | monitor_reinit(struct monitor *mon) | |
1818 | { | |
1819 | int pair[2]; | |
1820 | ||
1821 | monitor_socketpair(pair); | |
1822 | ||
1823 | mon->m_recvfd = pair[0]; | |
1824 | mon->m_sendfd = pair[1]; | |
1825 | } | |
7364bd04 | 1826 | |
1827 | #ifdef GSSAPI | |
1828 | int | |
ca75d7de | 1829 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1830 | { |
ca75d7de | 1831 | gss_OID_desc goid; |
7364bd04 | 1832 | OM_uint32 major; |
1833 | u_int len; | |
1834 | ||
ca75d7de | 1835 | goid.elements = buffer_get_string(m, &len); |
1836 | goid.length = len; | |
7364bd04 | 1837 | |
ca75d7de | 1838 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1839 | |
ca75d7de | 1840 | xfree(goid.elements); |
7364bd04 | 1841 | |
1842 | buffer_clear(m); | |
1843 | buffer_put_int(m, major); | |
1844 | ||
8442cc66 | 1845 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1846 | |
1847 | /* Now we have a context, enable the step */ | |
1848 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1849 | ||
1850 | return (0); | |
1851 | } | |
1852 | ||
1853 | int | |
ca75d7de | 1854 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1855 | { |
1856 | gss_buffer_desc in; | |
1857 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1858 | OM_uint32 major, minor; |
7364bd04 | 1859 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1860 | u_int len; |
7364bd04 | 1861 | |
f99e1ca4 | 1862 | in.value = buffer_get_string(m, &len); |
1863 | in.length = len; | |
7364bd04 | 1864 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1865 | xfree(in.value); | |
1866 | ||
1867 | buffer_clear(m); | |
1868 | buffer_put_int(m, major); | |
1869 | buffer_put_string(m, out.value, out.length); | |
1870 | buffer_put_int(m, flags); | |
ca75d7de | 1871 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1872 | |
1873 | gss_release_buffer(&minor, &out); | |
1874 | ||
8442cc66 | 1875 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1876 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1877 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1878 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1879 | } |
1880 | return (0); | |
1881 | } | |
1882 | ||
0789992b | 1883 | int |
ca75d7de | 1884 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1885 | { |
1886 | gss_buffer_desc gssbuf, mic; | |
1887 | OM_uint32 ret; | |
1888 | u_int len; | |
b6453d99 | 1889 | |
0789992b | 1890 | gssbuf.value = buffer_get_string(m, &len); |
1891 | gssbuf.length = len; | |
1892 | mic.value = buffer_get_string(m, &len); | |
1893 | mic.length = len; | |
b6453d99 | 1894 | |
0789992b | 1895 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1896 | |
0789992b | 1897 | xfree(gssbuf.value); |
1898 | xfree(mic.value); | |
b6453d99 | 1899 | |
0789992b | 1900 | buffer_clear(m); |
1901 | buffer_put_int(m, ret); | |
b6453d99 | 1902 | |
ca75d7de | 1903 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1904 | |
0789992b | 1905 | if (!GSS_ERROR(ret)) |
1906 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1907 | |
0789992b | 1908 | return (0); |
1909 | } | |
1910 | ||
7364bd04 | 1911 | int |
ca75d7de | 1912 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1913 | { |
1914 | int authenticated; | |
1915 | ||
1916 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1917 | ||
1918 | buffer_clear(m); | |
1919 | buffer_put_int(m, authenticated); | |
1920 | ||
1921 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1922 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1923 | |
8442cc66 | 1924 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1925 | |
1926 | /* Monitor loop will terminate if authenticated */ | |
1927 | return (authenticated); | |
1928 | } | |
1929 | #endif /* GSSAPI */ |