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9305512d | 1 | /* $OpenBSD: monitor.c,v 1.79 2006/07/08 21:48:53 stevesk Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
aa2eae64 | 29 | |
30 | #include <sys/types.h> | |
5b04a8bf | 31 | #include <sys/socket.h> |
aa2eae64 | 32 | #include <sys/wait.h> |
1853d1ef | 33 | |
b5b88c19 | 34 | #ifdef HAVE_PATHS_H |
a75f5360 | 35 | #include <paths.h> |
b5b88c19 | 36 | #endif |
b1842393 | 37 | #include <pwd.h> |
ada68823 | 38 | #include <signal.h> |
1853d1ef | 39 | |
40 | #ifdef SKEY | |
41 | #include <skey.h> | |
42 | #endif | |
43 | ||
a75f5360 | 44 | #include <openssl/dh.h> |
45 | ||
1853d1ef | 46 | #include "ssh.h" |
47 | #include "auth.h" | |
48 | #include "kex.h" | |
49 | #include "dh.h" | |
a655c012 | 50 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
51 | #undef TARGET_OS_MAC | |
9b08c23f | 52 | #include "zlib.h" |
a655c012 | 53 | #define TARGET_OS_MAC 1 |
54 | #else | |
55 | #include "zlib.h" | |
56 | #endif | |
1853d1ef | 57 | #include "packet.h" |
58 | #include "auth-options.h" | |
59 | #include "sshpty.h" | |
60 | #include "channels.h" | |
61 | #include "session.h" | |
62 | #include "sshlogin.h" | |
63 | #include "canohost.h" | |
64 | #include "log.h" | |
65 | #include "servconf.h" | |
66 | #include "monitor.h" | |
67 | #include "monitor_mm.h" | |
68 | #include "monitor_wrap.h" | |
69 | #include "monitor_fdpass.h" | |
70 | #include "xmalloc.h" | |
71 | #include "misc.h" | |
72 | #include "buffer.h" | |
73 | #include "bufaux.h" | |
74 | #include "compat.h" | |
75 | #include "ssh2.h" | |
1853d1ef | 76 | |
7364bd04 | 77 | #ifdef GSSAPI |
78 | #include "ssh-gss.h" | |
79 | static Gssctxt *gsscontext = NULL; | |
80 | #endif | |
81 | ||
1853d1ef | 82 | /* Imports */ |
83 | extern ServerOptions options; | |
84 | extern u_int utmp_len; | |
85 | extern Newkeys *current_keys[]; | |
86 | extern z_stream incoming_stream; | |
87 | extern z_stream outgoing_stream; | |
88 | extern u_char session_id[]; | |
89 | extern Buffer input, output; | |
90 | extern Buffer auth_debug; | |
91 | extern int auth_debug_init; | |
be2ca0c9 | 92 | extern Buffer loginmsg; |
1853d1ef | 93 | |
94 | /* State exported from the child */ | |
95 | ||
96 | struct { | |
97 | z_stream incoming; | |
98 | z_stream outgoing; | |
99 | u_char *keyin; | |
100 | u_int keyinlen; | |
101 | u_char *keyout; | |
102 | u_int keyoutlen; | |
103 | u_char *ivin; | |
104 | u_int ivinlen; | |
105 | u_char *ivout; | |
106 | u_int ivoutlen; | |
9459414c | 107 | u_char *ssh1key; |
108 | u_int ssh1keylen; | |
1853d1ef | 109 | int ssh1cipher; |
110 | int ssh1protoflags; | |
111 | u_char *input; | |
112 | u_int ilen; | |
113 | u_char *output; | |
114 | u_int olen; | |
115 | } child_state; | |
116 | ||
b8e04133 | 117 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 118 | |
119 | int mm_answer_moduli(int, Buffer *); | |
120 | int mm_answer_sign(int, Buffer *); | |
121 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 122 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 123 | int mm_answer_authserv(int, Buffer *); |
124 | int mm_answer_authpassword(int, Buffer *); | |
125 | int mm_answer_bsdauthquery(int, Buffer *); | |
126 | int mm_answer_bsdauthrespond(int, Buffer *); | |
127 | int mm_answer_skeyquery(int, Buffer *); | |
128 | int mm_answer_skeyrespond(int, Buffer *); | |
129 | int mm_answer_keyallowed(int, Buffer *); | |
130 | int mm_answer_keyverify(int, Buffer *); | |
131 | int mm_answer_pty(int, Buffer *); | |
132 | int mm_answer_pty_cleanup(int, Buffer *); | |
133 | int mm_answer_term(int, Buffer *); | |
134 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
135 | int mm_answer_rsa_challenge(int, Buffer *); | |
136 | int mm_answer_rsa_response(int, Buffer *); | |
137 | int mm_answer_sesskey(int, Buffer *); | |
138 | int mm_answer_sessid(int, Buffer *); | |
139 | ||
ad200abb | 140 | #ifdef USE_PAM |
141 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 142 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 143 | int mm_answer_pam_init_ctx(int, Buffer *); |
144 | int mm_answer_pam_query(int, Buffer *); | |
145 | int mm_answer_pam_respond(int, Buffer *); | |
146 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 147 | #endif |
148 | ||
7364bd04 | 149 | #ifdef GSSAPI |
150 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
151 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
152 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 153 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 154 | #endif |
696f6bef | 155 | |
6039eeef | 156 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 157 | int mm_answer_audit_event(int, Buffer *); |
158 | int mm_answer_audit_command(int, Buffer *); | |
159 | #endif | |
160 | ||
1853d1ef | 161 | static Authctxt *authctxt; |
162 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
163 | ||
164 | /* local state for key verify */ | |
165 | static u_char *key_blob = NULL; | |
166 | static u_int key_bloblen = 0; | |
167 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 168 | static char *hostbased_cuser = NULL; |
169 | static char *hostbased_chost = NULL; | |
1853d1ef | 170 | static char *auth_method = "unknown"; |
a27002e5 | 171 | static u_int session_id2_len = 0; |
521d606b | 172 | static u_char *session_id2 = NULL; |
3a39206f | 173 | static pid_t monitor_child_pid; |
1853d1ef | 174 | |
175 | struct mon_table { | |
176 | enum monitor_reqtype type; | |
177 | int flags; | |
178 | int (*f)(int, Buffer *); | |
179 | }; | |
180 | ||
181 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
182 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
183 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 184 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 185 | |
186 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
187 | ||
188 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
189 | ||
190 | struct mon_table mon_dispatch_proto20[] = { | |
191 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
192 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
193 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
194 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 195 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 196 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 197 | #ifdef USE_PAM |
198 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 199 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 200 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
201 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
202 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
203 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 204 | #endif |
6039eeef | 205 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 206 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 207 | #endif |
1853d1ef | 208 | #ifdef BSD_AUTH |
209 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 210 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 211 | #endif |
212 | #ifdef SKEY | |
213 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
214 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
215 | #endif | |
216 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
217 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 218 | #ifdef GSSAPI |
219 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
220 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
221 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 222 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 223 | #endif |
1853d1ef | 224 | {0, 0, NULL} |
225 | }; | |
226 | ||
227 | struct mon_table mon_dispatch_postauth20[] = { | |
228 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
229 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
230 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
231 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
232 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 233 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 234 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
235 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
236 | #endif | |
1853d1ef | 237 | {0, 0, NULL} |
238 | }; | |
239 | ||
240 | struct mon_table mon_dispatch_proto15[] = { | |
241 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
242 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
243 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
244 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 245 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
246 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 247 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
248 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
249 | #ifdef BSD_AUTH | |
250 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 251 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 252 | #endif |
253 | #ifdef SKEY | |
254 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
255 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 256 | #endif |
257 | #ifdef USE_PAM | |
258 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 259 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 260 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
261 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
262 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
263 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 264 | #endif |
6039eeef | 265 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 266 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 267 | #endif |
268 | {0, 0, NULL} | |
269 | }; | |
270 | ||
271 | struct mon_table mon_dispatch_postauth15[] = { | |
272 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
273 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
274 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 275 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 276 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 277 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 278 | #endif |
1853d1ef | 279 | {0, 0, NULL} |
280 | }; | |
281 | ||
282 | struct mon_table *mon_dispatch; | |
283 | ||
284 | /* Specifies if a certain message is allowed at the moment */ | |
285 | ||
286 | static void | |
287 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
288 | { | |
289 | while (ent->f != NULL) { | |
290 | if (ent->type == type) { | |
291 | ent->flags &= ~MON_PERMIT; | |
292 | ent->flags |= permit ? MON_PERMIT : 0; | |
293 | return; | |
294 | } | |
295 | ent++; | |
296 | } | |
297 | } | |
298 | ||
299 | static void | |
300 | monitor_permit_authentications(int permit) | |
301 | { | |
302 | struct mon_table *ent = mon_dispatch; | |
303 | ||
304 | while (ent->f != NULL) { | |
305 | if (ent->flags & MON_AUTH) { | |
306 | ent->flags &= ~MON_PERMIT; | |
307 | ent->flags |= permit ? MON_PERMIT : 0; | |
308 | } | |
309 | ent++; | |
310 | } | |
311 | } | |
312 | ||
2362db19 | 313 | void |
314 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 315 | { |
316 | struct mon_table *ent; | |
317 | int authenticated = 0; | |
318 | ||
319 | debug3("preauth child monitor started"); | |
320 | ||
2362db19 | 321 | authctxt = _authctxt; |
322 | memset(authctxt, 0, sizeof(*authctxt)); | |
323 | ||
e05df884 | 324 | authctxt->loginmsg = &loginmsg; |
325 | ||
1853d1ef | 326 | if (compat20) { |
327 | mon_dispatch = mon_dispatch_proto20; | |
328 | ||
329 | /* Permit requests for moduli and signatures */ | |
330 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
331 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
332 | } else { | |
333 | mon_dispatch = mon_dispatch_proto15; | |
334 | ||
335 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
336 | } | |
337 | ||
1853d1ef | 338 | /* The first few requests do not require asynchronous access */ |
339 | while (!authenticated) { | |
c023a130 | 340 | auth_method = "unknown"; |
b5a28cbc | 341 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 342 | if (authenticated) { |
343 | if (!(ent->flags & MON_AUTHDECIDE)) | |
344 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 345 | __func__, ent->type); |
1853d1ef | 346 | if (authctxt->pw->pw_uid == 0 && |
347 | !auth_root_allowed(auth_method)) | |
348 | authenticated = 0; | |
5b9e2464 | 349 | #ifdef USE_PAM |
350 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 351 | if (options.use_pam && authenticated) { |
5b9e2464 | 352 | Buffer m; |
353 | ||
354 | buffer_init(&m); | |
aff51935 | 355 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 356 | MONITOR_REQ_PAM_ACCOUNT, &m); |
357 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
358 | buffer_free(&m); | |
359 | } | |
360 | #endif | |
1853d1ef | 361 | } |
362 | ||
c023a130 | 363 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 364 | auth_log(authctxt, authenticated, auth_method, |
365 | compat20 ? " ssh2" : ""); | |
366 | if (!authenticated) | |
367 | authctxt->failures++; | |
368 | } | |
369 | } | |
370 | ||
371 | if (!authctxt->valid) | |
1588c277 | 372 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 373 | if (strcmp(auth_method, "unknown") == 0) |
374 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 375 | |
376 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 377 | __func__, authctxt->user); |
1853d1ef | 378 | |
b5a28cbc | 379 | mm_get_keystate(pmonitor); |
1853d1ef | 380 | } |
381 | ||
3a39206f | 382 | static void |
383 | monitor_set_child_handler(pid_t pid) | |
384 | { | |
385 | monitor_child_pid = pid; | |
386 | } | |
387 | ||
388 | static void | |
ca75d7de | 389 | monitor_child_handler(int sig) |
3a39206f | 390 | { |
ca75d7de | 391 | kill(monitor_child_pid, sig); |
3a39206f | 392 | } |
393 | ||
1853d1ef | 394 | void |
b5a28cbc | 395 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 396 | { |
3a39206f | 397 | monitor_set_child_handler(pmonitor->m_pid); |
398 | signal(SIGHUP, &monitor_child_handler); | |
399 | signal(SIGTERM, &monitor_child_handler); | |
400 | ||
1853d1ef | 401 | if (compat20) { |
402 | mon_dispatch = mon_dispatch_postauth20; | |
403 | ||
404 | /* Permit requests for moduli and signatures */ | |
405 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
406 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
407 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 408 | } else { |
409 | mon_dispatch = mon_dispatch_postauth15; | |
410 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
411 | } | |
412 | if (!no_pty_flag) { | |
413 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
414 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
415 | } | |
416 | ||
417 | for (;;) | |
b5a28cbc | 418 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 419 | } |
420 | ||
421 | void | |
b5a28cbc | 422 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 423 | { |
0496cf34 | 424 | if (options.compression) { |
425 | /* The member allocation is not visible, so sync it */ | |
426 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
427 | } | |
1853d1ef | 428 | } |
429 | ||
430 | int | |
b5a28cbc | 431 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 432 | struct mon_table **pent) |
433 | { | |
434 | Buffer m; | |
435 | int ret; | |
436 | u_char type; | |
437 | ||
438 | buffer_init(&m); | |
439 | ||
b5a28cbc | 440 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 441 | type = buffer_get_char(&m); |
442 | ||
1588c277 | 443 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 444 | |
445 | while (ent->f != NULL) { | |
446 | if (ent->type == type) | |
447 | break; | |
448 | ent++; | |
449 | } | |
450 | ||
451 | if (ent->f != NULL) { | |
452 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 453 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 454 | type); |
b5a28cbc | 455 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 456 | buffer_free(&m); |
457 | ||
458 | /* The child may use this request only once, disable it */ | |
459 | if (ent->flags & MON_ONCE) { | |
1588c277 | 460 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 461 | type); |
462 | ent->flags &= ~MON_PERMIT; | |
463 | } | |
464 | ||
465 | if (pent != NULL) | |
466 | *pent = ent; | |
467 | ||
468 | return ret; | |
469 | } | |
470 | ||
1588c277 | 471 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 472 | |
473 | /* NOTREACHED */ | |
474 | return (-1); | |
475 | } | |
476 | ||
477 | /* allowed key state */ | |
478 | static int | |
479 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
480 | { | |
481 | /* make sure key is allowed */ | |
482 | if (key_blob == NULL || key_bloblen != bloblen || | |
483 | memcmp(key_blob, blob, key_bloblen)) | |
484 | return (0); | |
485 | return (1); | |
486 | } | |
487 | ||
488 | static void | |
489 | monitor_reset_key_state(void) | |
490 | { | |
491 | /* reset state */ | |
492 | if (key_blob != NULL) | |
493 | xfree(key_blob); | |
494 | if (hostbased_cuser != NULL) | |
495 | xfree(hostbased_cuser); | |
496 | if (hostbased_chost != NULL) | |
497 | xfree(hostbased_chost); | |
498 | key_blob = NULL; | |
499 | key_bloblen = 0; | |
500 | key_blobtype = MM_NOKEY; | |
501 | hostbased_cuser = NULL; | |
502 | hostbased_chost = NULL; | |
503 | } | |
504 | ||
505 | int | |
ca75d7de | 506 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 507 | { |
508 | DH *dh; | |
509 | int min, want, max; | |
510 | ||
511 | min = buffer_get_int(m); | |
512 | want = buffer_get_int(m); | |
513 | max = buffer_get_int(m); | |
514 | ||
515 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 516 | __func__, min, want, max); |
1853d1ef | 517 | /* We need to check here, too, in case the child got corrupted */ |
518 | if (max < min || want < min || max < want) | |
519 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 520 | __func__, min, want, max); |
1853d1ef | 521 | |
522 | buffer_clear(m); | |
523 | ||
524 | dh = choose_dh(min, want, max); | |
525 | if (dh == NULL) { | |
526 | buffer_put_char(m, 0); | |
527 | return (0); | |
528 | } else { | |
529 | /* Send first bignum */ | |
530 | buffer_put_char(m, 1); | |
531 | buffer_put_bignum2(m, dh->p); | |
532 | buffer_put_bignum2(m, dh->g); | |
533 | ||
534 | DH_free(dh); | |
535 | } | |
ca75d7de | 536 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 537 | return (0); |
538 | } | |
539 | ||
540 | int | |
ca75d7de | 541 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 542 | { |
543 | Key *key; | |
544 | u_char *p; | |
545 | u_char *signature; | |
546 | u_int siglen, datlen; | |
547 | int keyid; | |
548 | ||
1588c277 | 549 | debug3("%s", __func__); |
1853d1ef | 550 | |
551 | keyid = buffer_get_int(m); | |
552 | p = buffer_get_string(m, &datlen); | |
553 | ||
2ff8003a | 554 | /* |
b4bbf172 | 555 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 556 | * SHA256 (32 byte) hashes |
557 | */ | |
558 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 559 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 560 | |
521d606b | 561 | /* save session id, it will be passed on the first call */ |
562 | if (session_id2_len == 0) { | |
563 | session_id2_len = datlen; | |
564 | session_id2 = xmalloc(session_id2_len); | |
565 | memcpy(session_id2, p, session_id2_len); | |
566 | } | |
567 | ||
1853d1ef | 568 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 569 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 570 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 571 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 572 | |
d1ff09ba | 573 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 574 | |
575 | buffer_clear(m); | |
576 | buffer_put_string(m, signature, siglen); | |
577 | ||
578 | xfree(p); | |
579 | xfree(signature); | |
580 | ||
ca75d7de | 581 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 582 | |
583 | /* Turn on permissions for getpwnam */ | |
584 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
585 | ||
586 | return (0); | |
587 | } | |
588 | ||
589 | /* Retrieves the password entry and also checks if the user is permitted */ | |
590 | ||
591 | int | |
ca75d7de | 592 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 593 | { |
18a8f313 | 594 | char *username; |
1853d1ef | 595 | struct passwd *pwent; |
596 | int allowed = 0; | |
597 | ||
1588c277 | 598 | debug3("%s", __func__); |
1853d1ef | 599 | |
600 | if (authctxt->attempt++ != 0) | |
1588c277 | 601 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 602 | |
18a8f313 | 603 | username = buffer_get_string(m, NULL); |
1853d1ef | 604 | |
18a8f313 | 605 | pwent = getpwnamallow(username); |
1853d1ef | 606 | |
18a8f313 | 607 | authctxt->user = xstrdup(username); |
608 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
609 | xfree(username); | |
1853d1ef | 610 | |
611 | buffer_clear(m); | |
612 | ||
613 | if (pwent == NULL) { | |
614 | buffer_put_char(m, 0); | |
b2a5802b | 615 | authctxt->pw = fakepw(); |
1853d1ef | 616 | goto out; |
617 | } | |
618 | ||
619 | allowed = 1; | |
620 | authctxt->pw = pwent; | |
621 | authctxt->valid = 1; | |
622 | ||
623 | buffer_put_char(m, 1); | |
624 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
625 | buffer_put_cstring(m, pwent->pw_name); | |
626 | buffer_put_cstring(m, "*"); | |
627 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 628 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 629 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 630 | #endif |
1853d1ef | 631 | buffer_put_cstring(m, pwent->pw_dir); |
632 | buffer_put_cstring(m, pwent->pw_shell); | |
633 | ||
634 | out: | |
1588c277 | 635 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 636 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 637 | |
638 | /* For SSHv1 allow authentication now */ | |
639 | if (!compat20) | |
640 | monitor_permit_authentications(1); | |
94a73cdc | 641 | else { |
1853d1ef | 642 | /* Allow service/style information on the auth context */ |
643 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 644 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
645 | } | |
1853d1ef | 646 | |
efe44db6 | 647 | #ifdef USE_PAM |
7fceb20d | 648 | if (options.use_pam) |
649 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 650 | #endif |
6039eeef | 651 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 652 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 653 | #endif |
1853d1ef | 654 | |
655 | return (0); | |
656 | } | |
657 | ||
ca75d7de | 658 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 659 | { |
660 | char *banner; | |
661 | ||
662 | buffer_clear(m); | |
663 | banner = auth2_read_banner(); | |
664 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 665 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 666 | |
667 | if (banner != NULL) | |
30e37ee6 | 668 | xfree(banner); |
94a73cdc | 669 | |
670 | return (0); | |
671 | } | |
672 | ||
1853d1ef | 673 | int |
ca75d7de | 674 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 675 | { |
676 | monitor_permit_authentications(1); | |
677 | ||
678 | authctxt->service = buffer_get_string(m, NULL); | |
679 | authctxt->style = buffer_get_string(m, NULL); | |
680 | debug3("%s: service=%s, style=%s", | |
1588c277 | 681 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 682 | |
683 | if (strlen(authctxt->style) == 0) { | |
684 | xfree(authctxt->style); | |
685 | authctxt->style = NULL; | |
686 | } | |
687 | ||
688 | return (0); | |
689 | } | |
690 | ||
691 | int | |
ca75d7de | 692 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 693 | { |
694 | static int call_count; | |
695 | char *passwd; | |
d341742a | 696 | int authenticated; |
697 | u_int plen; | |
1853d1ef | 698 | |
699 | passwd = buffer_get_string(m, &plen); | |
700 | /* Only authenticate if the context is valid */ | |
aa586f8e | 701 | authenticated = options.password_authentication && |
96d0bf74 | 702 | auth_password(authctxt, passwd); |
1853d1ef | 703 | memset(passwd, 0, strlen(passwd)); |
704 | xfree(passwd); | |
705 | ||
706 | buffer_clear(m); | |
707 | buffer_put_int(m, authenticated); | |
708 | ||
1588c277 | 709 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 710 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 711 | |
712 | call_count++; | |
713 | if (plen == 0 && call_count == 1) | |
714 | auth_method = "none"; | |
715 | else | |
716 | auth_method = "password"; | |
717 | ||
718 | /* Causes monitor loop to terminate if authenticated */ | |
719 | return (authenticated); | |
720 | } | |
721 | ||
722 | #ifdef BSD_AUTH | |
723 | int | |
ca75d7de | 724 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 725 | { |
726 | char *name, *infotxt; | |
727 | u_int numprompts; | |
728 | u_int *echo_on; | |
729 | char **prompts; | |
6d6c25e3 | 730 | u_int success; |
1853d1ef | 731 | |
6d6c25e3 | 732 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
733 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 734 | |
735 | buffer_clear(m); | |
6d6c25e3 | 736 | buffer_put_int(m, success); |
737 | if (success) | |
1853d1ef | 738 | buffer_put_cstring(m, prompts[0]); |
739 | ||
6d6c25e3 | 740 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 741 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 742 | |
6d6c25e3 | 743 | if (success) { |
1853d1ef | 744 | xfree(name); |
745 | xfree(infotxt); | |
746 | xfree(prompts); | |
747 | xfree(echo_on); | |
748 | } | |
749 | ||
750 | return (0); | |
751 | } | |
752 | ||
753 | int | |
ca75d7de | 754 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 755 | { |
756 | char *response; | |
757 | int authok; | |
758 | ||
759 | if (authctxt->as == 0) | |
1588c277 | 760 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 761 | |
762 | response = buffer_get_string(m, NULL); | |
aa586f8e | 763 | authok = options.challenge_response_authentication && |
764 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 765 | authctxt->as = NULL; |
1588c277 | 766 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 767 | xfree(response); |
768 | ||
769 | buffer_clear(m); | |
770 | buffer_put_int(m, authok); | |
771 | ||
1588c277 | 772 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 773 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 774 | |
775 | auth_method = "bsdauth"; | |
776 | ||
777 | return (authok != 0); | |
778 | } | |
779 | #endif | |
780 | ||
781 | #ifdef SKEY | |
782 | int | |
ca75d7de | 783 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 784 | { |
785 | struct skey skey; | |
786 | char challenge[1024]; | |
6d6c25e3 | 787 | u_int success; |
1853d1ef | 788 | |
f2b7b5c8 | 789 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
790 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 791 | |
792 | buffer_clear(m); | |
6d6c25e3 | 793 | buffer_put_int(m, success); |
794 | if (success) | |
1853d1ef | 795 | buffer_put_cstring(m, challenge); |
796 | ||
6d6c25e3 | 797 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 798 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 799 | |
800 | return (0); | |
801 | } | |
802 | ||
803 | int | |
ca75d7de | 804 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 805 | { |
806 | char *response; | |
807 | int authok; | |
808 | ||
809 | response = buffer_get_string(m, NULL); | |
810 | ||
aa586f8e | 811 | authok = (options.challenge_response_authentication && |
812 | authctxt->valid && | |
1853d1ef | 813 | skey_haskey(authctxt->pw->pw_name) == 0 && |
814 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
815 | ||
816 | xfree(response); | |
817 | ||
818 | buffer_clear(m); | |
819 | buffer_put_int(m, authok); | |
820 | ||
1588c277 | 821 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 822 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 823 | |
824 | auth_method = "skey"; | |
825 | ||
826 | return (authok != 0); | |
827 | } | |
828 | #endif | |
829 | ||
ad200abb | 830 | #ifdef USE_PAM |
831 | int | |
8b3ec5fd | 832 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 833 | { |
7fceb20d | 834 | if (!options.use_pam) |
835 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
836 | ||
529d73ab | 837 | start_pam(authctxt); |
ad200abb | 838 | |
5b9e2464 | 839 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
840 | ||
ad200abb | 841 | return (0); |
842 | } | |
05114c74 | 843 | |
5b9e2464 | 844 | int |
8b3ec5fd | 845 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 846 | { |
847 | u_int ret; | |
b6453d99 | 848 | |
5b9e2464 | 849 | if (!options.use_pam) |
850 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
851 | ||
852 | ret = do_pam_account(); | |
853 | ||
854 | buffer_put_int(m, ret); | |
cfb60d3a | 855 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 856 | |
8b3ec5fd | 857 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 858 | |
859 | return (ret); | |
860 | } | |
861 | ||
05114c74 | 862 | static void *sshpam_ctxt, *sshpam_authok; |
863 | extern KbdintDevice sshpam_device; | |
864 | ||
865 | int | |
8b3ec5fd | 866 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 867 | { |
868 | ||
869 | debug3("%s", __func__); | |
870 | authctxt->user = buffer_get_string(m, NULL); | |
871 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
872 | sshpam_authok = NULL; | |
873 | buffer_clear(m); | |
874 | if (sshpam_ctxt != NULL) { | |
875 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
876 | buffer_put_int(m, 1); | |
877 | } else { | |
878 | buffer_put_int(m, 0); | |
879 | } | |
8b3ec5fd | 880 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 881 | return (0); |
882 | } | |
883 | ||
884 | int | |
8b3ec5fd | 885 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 886 | { |
887 | char *name, *info, **prompts; | |
a1a073cc | 888 | u_int i, num, *echo_on; |
889 | int ret; | |
05114c74 | 890 | |
891 | debug3("%s", __func__); | |
892 | sshpam_authok = NULL; | |
893 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
894 | if (ret == 0 && num == 0) | |
895 | sshpam_authok = sshpam_ctxt; | |
896 | if (num > 1 || name == NULL || info == NULL) | |
897 | ret = -1; | |
898 | buffer_clear(m); | |
899 | buffer_put_int(m, ret); | |
900 | buffer_put_cstring(m, name); | |
901 | xfree(name); | |
902 | buffer_put_cstring(m, info); | |
903 | xfree(info); | |
904 | buffer_put_int(m, num); | |
905 | for (i = 0; i < num; ++i) { | |
906 | buffer_put_cstring(m, prompts[i]); | |
907 | xfree(prompts[i]); | |
908 | buffer_put_int(m, echo_on[i]); | |
909 | } | |
910 | if (prompts != NULL) | |
911 | xfree(prompts); | |
912 | if (echo_on != NULL) | |
913 | xfree(echo_on); | |
2ae7f715 | 914 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 915 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 916 | return (0); |
917 | } | |
918 | ||
919 | int | |
8b3ec5fd | 920 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 921 | { |
922 | char **resp; | |
a1a073cc | 923 | u_int i, num; |
924 | int ret; | |
05114c74 | 925 | |
926 | debug3("%s", __func__); | |
927 | sshpam_authok = NULL; | |
928 | num = buffer_get_int(m); | |
929 | if (num > 0) { | |
01d35895 | 930 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 931 | for (i = 0; i < num; ++i) |
932 | resp[i] = buffer_get_string(m, NULL); | |
933 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
934 | for (i = 0; i < num; ++i) | |
935 | xfree(resp[i]); | |
936 | xfree(resp); | |
937 | } else { | |
938 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
939 | } | |
940 | buffer_clear(m); | |
941 | buffer_put_int(m, ret); | |
8b3ec5fd | 942 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 943 | auth_method = "keyboard-interactive/pam"; |
944 | if (ret == 0) | |
945 | sshpam_authok = sshpam_ctxt; | |
946 | return (0); | |
947 | } | |
948 | ||
949 | int | |
8b3ec5fd | 950 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 951 | { |
952 | ||
953 | debug3("%s", __func__); | |
954 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
955 | buffer_clear(m); | |
8b3ec5fd | 956 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 957 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 958 | return (sshpam_authok == sshpam_ctxt); |
959 | } | |
ad200abb | 960 | #endif |
961 | ||
1853d1ef | 962 | static void |
963 | mm_append_debug(Buffer *m) | |
964 | { | |
965 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 966 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 967 | buffer_append(m, buffer_ptr(&auth_debug), |
968 | buffer_len(&auth_debug)); | |
969 | buffer_clear(&auth_debug); | |
970 | } | |
971 | } | |
972 | ||
973 | int | |
ca75d7de | 974 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 975 | { |
976 | Key *key; | |
661e45a0 | 977 | char *cuser, *chost; |
978 | u_char *blob; | |
1853d1ef | 979 | u_int bloblen; |
980 | enum mm_keytype type = 0; | |
981 | int allowed = 0; | |
982 | ||
1588c277 | 983 | debug3("%s entering", __func__); |
1853d1ef | 984 | |
985 | type = buffer_get_int(m); | |
986 | cuser = buffer_get_string(m, NULL); | |
987 | chost = buffer_get_string(m, NULL); | |
988 | blob = buffer_get_string(m, &bloblen); | |
989 | ||
990 | key = key_from_blob(blob, bloblen); | |
991 | ||
992 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
993 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 994 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 995 | |
1588c277 | 996 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 997 | |
fdaef11e | 998 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 999 | switch (type) { |
1853d1ef | 1000 | case MM_USERKEY: |
aa586f8e | 1001 | allowed = options.pubkey_authentication && |
1002 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1003 | auth_method = "publickey"; |
1853d1ef | 1004 | break; |
1005 | case MM_HOSTKEY: | |
aa586f8e | 1006 | allowed = options.hostbased_authentication && |
1007 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1008 | cuser, chost, key); |
c023a130 | 1009 | auth_method = "hostbased"; |
1853d1ef | 1010 | break; |
1011 | case MM_RSAHOSTKEY: | |
1012 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1013 | allowed = options.rhosts_rsa_authentication && |
1014 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1015 | cuser, chost, key); |
c023a130 | 1016 | auth_method = "rsa"; |
1853d1ef | 1017 | break; |
1018 | default: | |
1588c277 | 1019 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1020 | break; |
1021 | } | |
1853d1ef | 1022 | } |
3e2f2431 | 1023 | if (key != NULL) |
1024 | key_free(key); | |
1853d1ef | 1025 | |
1026 | /* clear temporarily storage (used by verify) */ | |
1027 | monitor_reset_key_state(); | |
1028 | ||
1029 | if (allowed) { | |
1030 | /* Save temporarily for comparison in verify */ | |
1031 | key_blob = blob; | |
1032 | key_bloblen = bloblen; | |
1033 | key_blobtype = type; | |
1034 | hostbased_cuser = cuser; | |
1035 | hostbased_chost = chost; | |
98d40a74 | 1036 | } else { |
c023a130 | 1037 | /* Log failed attempt */ |
1038 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1039 | xfree(blob); |
1040 | xfree(cuser); | |
1041 | xfree(chost); | |
1853d1ef | 1042 | } |
1043 | ||
1044 | debug3("%s: key %p is %s", | |
1588c277 | 1045 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1046 | |
1047 | buffer_clear(m); | |
1048 | buffer_put_int(m, allowed); | |
92e15201 | 1049 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1050 | |
1051 | mm_append_debug(m); | |
1052 | ||
ca75d7de | 1053 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1054 | |
1055 | if (type == MM_RSAHOSTKEY) | |
1056 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1057 | ||
1058 | return (0); | |
1059 | } | |
1060 | ||
1061 | static int | |
1062 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1063 | { | |
1064 | Buffer b; | |
661e45a0 | 1065 | char *p; |
1853d1ef | 1066 | u_int len; |
1067 | int fail = 0; | |
1853d1ef | 1068 | |
1069 | buffer_init(&b); | |
1070 | buffer_append(&b, data, datalen); | |
1071 | ||
1072 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1073 | p = buffer_ptr(&b); |
1074 | len = buffer_len(&b); | |
1075 | if ((session_id2 == NULL) || | |
1076 | (len < session_id2_len) || | |
1077 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1078 | fail++; | |
1853d1ef | 1079 | buffer_consume(&b, session_id2_len); |
1080 | } else { | |
521d606b | 1081 | p = buffer_get_string(&b, &len); |
1082 | if ((session_id2 == NULL) || | |
1083 | (len != session_id2_len) || | |
1084 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1085 | fail++; |
521d606b | 1086 | xfree(p); |
1853d1ef | 1087 | } |
1088 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1089 | fail++; | |
1090 | p = buffer_get_string(&b, NULL); | |
1091 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1092 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1093 | authctxt->user, p); |
1094 | fail++; | |
1095 | } | |
1096 | xfree(p); | |
1097 | buffer_skip_string(&b); | |
1098 | if (datafellows & SSH_BUG_PKAUTH) { | |
1099 | if (!buffer_get_char(&b)) | |
1100 | fail++; | |
1101 | } else { | |
1102 | p = buffer_get_string(&b, NULL); | |
1103 | if (strcmp("publickey", p) != 0) | |
1104 | fail++; | |
1105 | xfree(p); | |
1106 | if (!buffer_get_char(&b)) | |
1107 | fail++; | |
1108 | buffer_skip_string(&b); | |
1109 | } | |
1110 | buffer_skip_string(&b); | |
1111 | if (buffer_len(&b) != 0) | |
1112 | fail++; | |
1113 | buffer_free(&b); | |
1114 | return (fail == 0); | |
1115 | } | |
1116 | ||
1117 | static int | |
661e45a0 | 1118 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1119 | char *chost) | |
1853d1ef | 1120 | { |
1121 | Buffer b; | |
661e45a0 | 1122 | char *p; |
1853d1ef | 1123 | u_int len; |
1124 | int fail = 0; | |
1853d1ef | 1125 | |
1126 | buffer_init(&b); | |
1127 | buffer_append(&b, data, datalen); | |
1128 | ||
521d606b | 1129 | p = buffer_get_string(&b, &len); |
1130 | if ((session_id2 == NULL) || | |
1131 | (len != session_id2_len) || | |
1132 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1133 | fail++; |
521d606b | 1134 | xfree(p); |
1135 | ||
1853d1ef | 1136 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1137 | fail++; | |
1138 | p = buffer_get_string(&b, NULL); | |
1139 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1140 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1141 | authctxt->user, p); |
1142 | fail++; | |
1143 | } | |
1144 | xfree(p); | |
1145 | buffer_skip_string(&b); /* service */ | |
1146 | p = buffer_get_string(&b, NULL); | |
1147 | if (strcmp(p, "hostbased") != 0) | |
1148 | fail++; | |
1149 | xfree(p); | |
1150 | buffer_skip_string(&b); /* pkalg */ | |
1151 | buffer_skip_string(&b); /* pkblob */ | |
1152 | ||
1153 | /* verify client host, strip trailing dot if necessary */ | |
1154 | p = buffer_get_string(&b, NULL); | |
1155 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1156 | p[len - 1] = '\0'; | |
1157 | if (strcmp(p, chost) != 0) | |
1158 | fail++; | |
1159 | xfree(p); | |
1160 | ||
1161 | /* verify client user */ | |
1162 | p = buffer_get_string(&b, NULL); | |
1163 | if (strcmp(p, cuser) != 0) | |
1164 | fail++; | |
1165 | xfree(p); | |
1166 | ||
1167 | if (buffer_len(&b) != 0) | |
1168 | fail++; | |
1169 | buffer_free(&b); | |
1170 | return (fail == 0); | |
1171 | } | |
1172 | ||
1173 | int | |
ca75d7de | 1174 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1175 | { |
1176 | Key *key; | |
1177 | u_char *signature, *data, *blob; | |
1178 | u_int signaturelen, datalen, bloblen; | |
1179 | int verified = 0; | |
1180 | int valid_data = 0; | |
1181 | ||
1182 | blob = buffer_get_string(m, &bloblen); | |
1183 | signature = buffer_get_string(m, &signaturelen); | |
1184 | data = buffer_get_string(m, &datalen); | |
1185 | ||
1186 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1187 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1188 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1189 | |
1190 | key = key_from_blob(blob, bloblen); | |
1191 | if (key == NULL) | |
1588c277 | 1192 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1193 | |
1194 | switch (key_blobtype) { | |
1195 | case MM_USERKEY: | |
1196 | valid_data = monitor_valid_userblob(data, datalen); | |
1197 | break; | |
1198 | case MM_HOSTKEY: | |
1199 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1200 | hostbased_cuser, hostbased_chost); | |
1201 | break; | |
1202 | default: | |
1203 | valid_data = 0; | |
1204 | break; | |
1205 | } | |
1206 | if (!valid_data) | |
1588c277 | 1207 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1208 | |
1209 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1210 | debug3("%s: key %p signature %s", | |
1588c277 | 1211 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1212 | |
1213 | key_free(key); | |
1214 | xfree(blob); | |
1215 | xfree(signature); | |
1216 | xfree(data); | |
1217 | ||
d17ef027 | 1218 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1219 | ||
1853d1ef | 1220 | monitor_reset_key_state(); |
1221 | ||
1222 | buffer_clear(m); | |
1223 | buffer_put_int(m, verified); | |
ca75d7de | 1224 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1225 | |
1853d1ef | 1226 | return (verified); |
1227 | } | |
1228 | ||
1229 | static void | |
1230 | mm_record_login(Session *s, struct passwd *pw) | |
1231 | { | |
1232 | socklen_t fromlen; | |
1233 | struct sockaddr_storage from; | |
1234 | ||
1235 | /* | |
1236 | * Get IP address of client. If the connection is not a socket, let | |
1237 | * the address be 0.0.0.0. | |
1238 | */ | |
1239 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1240 | fromlen = sizeof(from); |
1853d1ef | 1241 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1242 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1243 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1244 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1245 | cleanup_exit(255); |
1853d1ef | 1246 | } |
1247 | } | |
1248 | /* Record that there was a login on that tty from the remote host. */ | |
1249 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1250 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1251 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1252 | } |
1253 | ||
1254 | static void | |
1255 | mm_session_close(Session *s) | |
1256 | { | |
b9ed513a | 1257 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1258 | if (s->ttyfd != -1) { |
1588c277 | 1259 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1260 | session_pty_cleanup2(s); |
1261 | } | |
1262 | s->used = 0; | |
1263 | } | |
1264 | ||
1265 | int | |
ca75d7de | 1266 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1267 | { |
b5a28cbc | 1268 | extern struct monitor *pmonitor; |
1853d1ef | 1269 | Session *s; |
1270 | int res, fd0; | |
1271 | ||
1588c277 | 1272 | debug3("%s entering", __func__); |
1853d1ef | 1273 | |
1274 | buffer_clear(m); | |
1275 | s = session_new(); | |
1276 | if (s == NULL) | |
1277 | goto error; | |
1278 | s->authctxt = authctxt; | |
1279 | s->pw = authctxt->pw; | |
b5a28cbc | 1280 | s->pid = pmonitor->m_pid; |
1853d1ef | 1281 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1282 | if (res == 0) | |
1283 | goto error; | |
1853d1ef | 1284 | pty_setowner(authctxt->pw, s->tty); |
1285 | ||
1286 | buffer_put_int(m, 1); | |
1287 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1288 | |
1289 | /* We need to trick ttyslot */ | |
1290 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1291 | fatal("%s: dup2", __func__); |
1853d1ef | 1292 | |
1293 | mm_record_login(s, authctxt->pw); | |
1294 | ||
1295 | /* Now we can close the file descriptor again */ | |
1296 | close(0); | |
1297 | ||
be2ca0c9 | 1298 | /* send messages generated by record_login */ |
1299 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1300 | buffer_clear(&loginmsg); | |
1301 | ||
1302 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1303 | ||
1304 | mm_send_fd(sock, s->ptyfd); | |
1305 | mm_send_fd(sock, s->ttyfd); | |
1306 | ||
1853d1ef | 1307 | /* make sure nothing uses fd 0 */ |
1308 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1309 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1310 | if (fd0 != 0) |
1588c277 | 1311 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1312 | |
1313 | /* slave is not needed */ | |
1314 | close(s->ttyfd); | |
1315 | s->ttyfd = s->ptyfd; | |
1316 | /* no need to dup() because nobody closes ptyfd */ | |
1317 | s->ptymaster = s->ptyfd; | |
1318 | ||
1588c277 | 1319 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1320 | |
1321 | return (0); | |
1322 | ||
1323 | error: | |
1324 | if (s != NULL) | |
1325 | mm_session_close(s); | |
1326 | buffer_put_int(m, 0); | |
ca75d7de | 1327 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1328 | return (0); |
1329 | } | |
1330 | ||
1331 | int | |
ca75d7de | 1332 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1333 | { |
1334 | Session *s; | |
1335 | char *tty; | |
1336 | ||
1588c277 | 1337 | debug3("%s entering", __func__); |
1853d1ef | 1338 | |
1339 | tty = buffer_get_string(m, NULL); | |
1340 | if ((s = session_by_tty(tty)) != NULL) | |
1341 | mm_session_close(s); | |
1342 | buffer_clear(m); | |
1343 | xfree(tty); | |
1344 | return (0); | |
1345 | } | |
1346 | ||
1347 | int | |
ca75d7de | 1348 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1349 | { |
1350 | BIGNUM *p; | |
1351 | int rsafail; | |
1352 | ||
1353 | /* Turn off permissions */ | |
75cccc2c | 1354 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1355 | |
1356 | if ((p = BN_new()) == NULL) | |
1588c277 | 1357 | fatal("%s: BN_new", __func__); |
1853d1ef | 1358 | |
1359 | buffer_get_bignum2(m, p); | |
1360 | ||
1361 | rsafail = ssh1_session_key(p); | |
1362 | ||
1363 | buffer_clear(m); | |
1364 | buffer_put_int(m, rsafail); | |
1365 | buffer_put_bignum2(m, p); | |
1366 | ||
1367 | BN_clear_free(p); | |
1368 | ||
ca75d7de | 1369 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1370 | |
1371 | /* Turn on permissions for sessid passing */ | |
1372 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1373 | ||
1374 | return (0); | |
1375 | } | |
1376 | ||
1377 | int | |
ca75d7de | 1378 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1379 | { |
1380 | int i; | |
1381 | ||
1588c277 | 1382 | debug3("%s entering", __func__); |
1853d1ef | 1383 | |
1384 | if (buffer_len(m) != 16) | |
1588c277 | 1385 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1386 | for (i = 0; i < 16; i++) |
1387 | session_id[i] = buffer_get_char(m); | |
1388 | ||
1389 | /* Turn on permissions for getpwnam */ | |
1390 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1391 | ||
1392 | return (0); | |
1393 | } | |
1394 | ||
1395 | int | |
ca75d7de | 1396 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1397 | { |
1398 | BIGNUM *client_n; | |
1399 | Key *key = NULL; | |
1400 | u_char *blob = NULL; | |
1401 | u_int blen = 0; | |
1402 | int allowed = 0; | |
1403 | ||
1588c277 | 1404 | debug3("%s entering", __func__); |
1853d1ef | 1405 | |
c023a130 | 1406 | auth_method = "rsa"; |
aa586f8e | 1407 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1408 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1409 | fatal("%s: BN_new", __func__); |
1853d1ef | 1410 | buffer_get_bignum2(m, client_n); |
1411 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1412 | BN_clear_free(client_n); | |
1413 | } | |
1414 | buffer_clear(m); | |
1415 | buffer_put_int(m, allowed); | |
92e15201 | 1416 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1417 | |
1418 | /* clear temporarily storage (used by generate challenge) */ | |
1419 | monitor_reset_key_state(); | |
1420 | ||
1421 | if (allowed && key != NULL) { | |
1422 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1423 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1424 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1425 | buffer_put_string(m, blob, blen); |
1426 | ||
1427 | /* Save temporarily for comparison in verify */ | |
1428 | key_blob = blob; | |
1429 | key_bloblen = blen; | |
1430 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1431 | } |
3e2f2431 | 1432 | if (key != NULL) |
1433 | key_free(key); | |
1853d1ef | 1434 | |
1435 | mm_append_debug(m); | |
1436 | ||
ca75d7de | 1437 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1438 | |
1439 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1440 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1441 | return (0); | |
1442 | } | |
1443 | ||
1444 | int | |
ca75d7de | 1445 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1446 | { |
1447 | Key *key = NULL; | |
1448 | u_char *blob; | |
1449 | u_int blen; | |
1450 | ||
1588c277 | 1451 | debug3("%s entering", __func__); |
1853d1ef | 1452 | |
1453 | if (!authctxt->valid) | |
1588c277 | 1454 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1455 | blob = buffer_get_string(m, &blen); |
1456 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1457 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1458 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1459 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1460 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1461 | fatal("%s: received bad key", __func__); |
1853d1ef | 1462 | |
1463 | if (ssh1_challenge) | |
1464 | BN_clear_free(ssh1_challenge); | |
1465 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1466 | ||
1467 | buffer_clear(m); | |
1468 | buffer_put_bignum2(m, ssh1_challenge); | |
1469 | ||
1588c277 | 1470 | debug3("%s sending reply", __func__); |
ca75d7de | 1471 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1472 | |
1473 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1474 | |
1475 | xfree(blob); | |
1476 | key_free(key); | |
1853d1ef | 1477 | return (0); |
1478 | } | |
1479 | ||
1480 | int | |
ca75d7de | 1481 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1482 | { |
1483 | Key *key = NULL; | |
1484 | u_char *blob, *response; | |
1485 | u_int blen, len; | |
1486 | int success; | |
1487 | ||
1588c277 | 1488 | debug3("%s entering", __func__); |
1853d1ef | 1489 | |
1490 | if (!authctxt->valid) | |
1588c277 | 1491 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1492 | if (ssh1_challenge == NULL) |
1588c277 | 1493 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1494 | |
1495 | blob = buffer_get_string(m, &blen); | |
1496 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1497 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1498 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1499 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1500 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1501 | fatal("%s: received bad key", __func__); |
1853d1ef | 1502 | response = buffer_get_string(m, &len); |
1503 | if (len != 16) | |
1588c277 | 1504 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1505 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1506 | ||
3e2f2431 | 1507 | xfree(blob); |
1853d1ef | 1508 | key_free(key); |
1509 | xfree(response); | |
1510 | ||
1511 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1512 | ||
1513 | /* reset state */ | |
1514 | BN_clear_free(ssh1_challenge); | |
1515 | ssh1_challenge = NULL; | |
1516 | monitor_reset_key_state(); | |
1517 | ||
1518 | buffer_clear(m); | |
1519 | buffer_put_int(m, success); | |
ca75d7de | 1520 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1521 | |
1522 | return (success); | |
1523 | } | |
1524 | ||
1525 | int | |
ca75d7de | 1526 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1527 | { |
b5a28cbc | 1528 | extern struct monitor *pmonitor; |
1853d1ef | 1529 | int res, status; |
1530 | ||
1588c277 | 1531 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1532 | |
1533 | /* The child is terminating */ | |
1534 | session_destroy_all(&mm_session_close); | |
1535 | ||
b5a28cbc | 1536 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1537 | if (errno != EINTR) |
1538 | exit(1); | |
1853d1ef | 1539 | |
1540 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1541 | ||
1542 | /* Terminate process */ | |
f6be21a0 | 1543 | exit(res); |
1853d1ef | 1544 | } |
1545 | ||
6039eeef | 1546 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1547 | /* Report that an audit event occurred */ |
1548 | int | |
1549 | mm_answer_audit_event(int socket, Buffer *m) | |
1550 | { | |
1551 | ssh_audit_event_t event; | |
1552 | ||
1553 | debug3("%s entering", __func__); | |
1554 | ||
1555 | event = buffer_get_int(m); | |
c00e4d75 | 1556 | switch(event) { |
6039eeef | 1557 | case SSH_AUTH_FAIL_PUBKEY: |
1558 | case SSH_AUTH_FAIL_HOSTBASED: | |
1559 | case SSH_AUTH_FAIL_GSSAPI: | |
1560 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1561 | case SSH_LOGIN_ROOT_DENIED: | |
1562 | case SSH_CONNECTION_CLOSE: | |
1563 | case SSH_INVALID_USER: | |
c00e4d75 | 1564 | audit_event(event); |
1565 | break; | |
1566 | default: | |
1567 | fatal("Audit event type %d not permitted", event); | |
1568 | } | |
1569 | ||
1570 | return (0); | |
1571 | } | |
1572 | ||
1573 | int | |
1574 | mm_answer_audit_command(int socket, Buffer *m) | |
1575 | { | |
1576 | u_int len; | |
1577 | char *cmd; | |
1578 | ||
1579 | debug3("%s entering", __func__); | |
1580 | cmd = buffer_get_string(m, &len); | |
1581 | /* sanity check command, if so how? */ | |
1582 | audit_run_command(cmd); | |
1583 | xfree(cmd); | |
c00e4d75 | 1584 | return (0); |
1585 | } | |
6039eeef | 1586 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1587 | |
1853d1ef | 1588 | void |
b5a28cbc | 1589 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1590 | { |
1591 | if (compat20) { | |
1592 | set_newkeys(MODE_IN); | |
1593 | set_newkeys(MODE_OUT); | |
1594 | } else { | |
1853d1ef | 1595 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1596 | packet_set_encryption_key(child_state.ssh1key, |
1597 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1598 | xfree(child_state.ssh1key); | |
1853d1ef | 1599 | } |
1600 | ||
9459414c | 1601 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1602 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1603 | xfree(child_state.keyout); | |
1604 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1605 | xfree(child_state.keyin); | |
1606 | ||
1607 | if (!compat20) { | |
1608 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1609 | xfree(child_state.ivout); | |
1610 | packet_set_iv(MODE_IN, child_state.ivin); | |
1611 | xfree(child_state.ivin); | |
1612 | } | |
1613 | ||
1614 | memcpy(&incoming_stream, &child_state.incoming, | |
1615 | sizeof(incoming_stream)); | |
1616 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1617 | sizeof(outgoing_stream)); | |
1618 | ||
1619 | /* Update with new address */ | |
0496cf34 | 1620 | if (options.compression) |
1621 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1622 | |
1623 | /* Network I/O buffers */ | |
1624 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1625 | buffer_clear(&input); | |
1626 | buffer_append(&input, child_state.input, child_state.ilen); | |
1627 | memset(child_state.input, 0, child_state.ilen); | |
1628 | xfree(child_state.input); | |
1629 | ||
1630 | buffer_clear(&output); | |
1631 | buffer_append(&output, child_state.output, child_state.olen); | |
1632 | memset(child_state.output, 0, child_state.olen); | |
1633 | xfree(child_state.output); | |
1634 | } | |
1635 | ||
1636 | static Kex * | |
1637 | mm_get_kex(Buffer *m) | |
1638 | { | |
1639 | Kex *kex; | |
1640 | void *blob; | |
1641 | u_int bloblen; | |
1642 | ||
52e3daed | 1643 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1644 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1645 | if ((session_id2 == NULL) || |
1646 | (kex->session_id_len != session_id2_len) || | |
1647 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1648 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1649 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1650 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1651 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1652 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1653 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1654 | kex->server = 1; |
1655 | kex->hostkey_type = buffer_get_int(m); | |
1656 | kex->kex_type = buffer_get_int(m); | |
1657 | blob = buffer_get_string(m, &bloblen); | |
1658 | buffer_init(&kex->my); | |
1659 | buffer_append(&kex->my, blob, bloblen); | |
1660 | xfree(blob); | |
1661 | blob = buffer_get_string(m, &bloblen); | |
1662 | buffer_init(&kex->peer); | |
1663 | buffer_append(&kex->peer, blob, bloblen); | |
1664 | xfree(blob); | |
1665 | kex->done = 1; | |
1666 | kex->flags = buffer_get_int(m); | |
1667 | kex->client_version_string = buffer_get_string(m, NULL); | |
1668 | kex->server_version_string = buffer_get_string(m, NULL); | |
1669 | kex->load_host_key=&get_hostkey_by_type; | |
1670 | kex->host_key_index=&get_hostkey_index; | |
1671 | ||
1672 | return (kex); | |
1673 | } | |
1674 | ||
1675 | /* This function requries careful sanity checking */ | |
1676 | ||
1677 | void | |
b5a28cbc | 1678 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1679 | { |
1680 | Buffer m; | |
1681 | u_char *blob, *p; | |
1682 | u_int bloblen, plen; | |
ffd7b36b | 1683 | u_int32_t seqnr, packets; |
1684 | u_int64_t blocks; | |
1853d1ef | 1685 | |
1588c277 | 1686 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1687 | |
1688 | buffer_init(&m); | |
b5a28cbc | 1689 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1690 | if (!compat20) { |
1691 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1692 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1693 | child_state.ssh1key = buffer_get_string(&m, |
1694 | &child_state.ssh1keylen); | |
1853d1ef | 1695 | child_state.ivout = buffer_get_string(&m, |
1696 | &child_state.ivoutlen); | |
1697 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1698 | goto skip; | |
1699 | } else { | |
1700 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1701 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1702 | } |
1703 | ||
1704 | blob = buffer_get_string(&m, &bloblen); | |
1705 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1706 | xfree(blob); | |
1707 | ||
1588c277 | 1708 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1709 | blob = buffer_get_string(&m, &bloblen); |
1710 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1711 | xfree(blob); | |
1712 | ||
1713 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1714 | seqnr = buffer_get_int(&m); |
1715 | blocks = buffer_get_int64(&m); | |
1716 | packets = buffer_get_int(&m); | |
1717 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1718 | seqnr = buffer_get_int(&m); | |
1719 | blocks = buffer_get_int64(&m); | |
1720 | packets = buffer_get_int(&m); | |
1721 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1722 | |
1723 | skip: | |
1724 | /* Get the key context */ | |
1725 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1726 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1727 | ||
1588c277 | 1728 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1729 | /* Get compression state */ |
1730 | p = buffer_get_string(&m, &plen); | |
1731 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1732 | fatal("%s: bad request size", __func__); |
1853d1ef | 1733 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1734 | xfree(p); | |
1735 | ||
1736 | p = buffer_get_string(&m, &plen); | |
1737 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1738 | fatal("%s: bad request size", __func__); |
1853d1ef | 1739 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1740 | xfree(p); | |
1741 | ||
1742 | /* Network I/O buffers */ | |
1588c277 | 1743 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1744 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1745 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1746 | ||
1747 | buffer_free(&m); | |
1748 | } | |
1749 | ||
1750 | ||
1751 | /* Allocation functions for zlib */ | |
1752 | void * | |
1753 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1754 | { | |
39e71188 | 1755 | size_t len = (size_t) size * ncount; |
1853d1ef | 1756 | void *address; |
1757 | ||
b85698ab | 1758 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1759 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1760 | ||
1761 | address = mm_malloc(mm, len); | |
1853d1ef | 1762 | |
1763 | return (address); | |
1764 | } | |
1765 | ||
1766 | void | |
1767 | mm_zfree(struct mm_master *mm, void *address) | |
1768 | { | |
1769 | mm_free(mm, address); | |
1770 | } | |
1771 | ||
1772 | void | |
1773 | mm_init_compression(struct mm_master *mm) | |
1774 | { | |
1775 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1776 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1777 | outgoing_stream.opaque = mm; | |
1778 | ||
1779 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1780 | incoming_stream.zfree = (free_func)mm_zfree; | |
1781 | incoming_stream.opaque = mm; | |
1782 | } | |
1783 | ||
1784 | /* XXX */ | |
1785 | ||
1786 | #define FD_CLOSEONEXEC(x) do { \ | |
1787 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1788 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1789 | } while (0) | |
1790 | ||
1791 | static void | |
1792 | monitor_socketpair(int *pair) | |
1793 | { | |
f1af2dbf | 1794 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1795 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1796 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1797 | #else |
1798 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1799 | __func__); |
f1af2dbf | 1800 | #endif |
1853d1ef | 1801 | FD_CLOSEONEXEC(pair[0]); |
1802 | FD_CLOSEONEXEC(pair[1]); | |
1803 | } | |
1804 | ||
1805 | #define MM_MEMSIZE 65536 | |
1806 | ||
1807 | struct monitor * | |
1808 | monitor_init(void) | |
1809 | { | |
1810 | struct monitor *mon; | |
1811 | int pair[2]; | |
1812 | ||
52e3daed | 1813 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1814 | |
1815 | monitor_socketpair(pair); | |
1816 | ||
1817 | mon->m_recvfd = pair[0]; | |
1818 | mon->m_sendfd = pair[1]; | |
1819 | ||
1820 | /* Used to share zlib space across processes */ | |
0496cf34 | 1821 | if (options.compression) { |
1822 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1823 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1824 | |
0496cf34 | 1825 | /* Compression needs to share state across borders */ |
1826 | mm_init_compression(mon->m_zlib); | |
1827 | } | |
1853d1ef | 1828 | |
1829 | return mon; | |
1830 | } | |
1831 | ||
1832 | void | |
1833 | monitor_reinit(struct monitor *mon) | |
1834 | { | |
1835 | int pair[2]; | |
1836 | ||
1837 | monitor_socketpair(pair); | |
1838 | ||
1839 | mon->m_recvfd = pair[0]; | |
1840 | mon->m_sendfd = pair[1]; | |
1841 | } | |
7364bd04 | 1842 | |
1843 | #ifdef GSSAPI | |
1844 | int | |
ca75d7de | 1845 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1846 | { |
ca75d7de | 1847 | gss_OID_desc goid; |
7364bd04 | 1848 | OM_uint32 major; |
1849 | u_int len; | |
1850 | ||
ca75d7de | 1851 | goid.elements = buffer_get_string(m, &len); |
1852 | goid.length = len; | |
7364bd04 | 1853 | |
ca75d7de | 1854 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1855 | |
ca75d7de | 1856 | xfree(goid.elements); |
7364bd04 | 1857 | |
1858 | buffer_clear(m); | |
1859 | buffer_put_int(m, major); | |
1860 | ||
8442cc66 | 1861 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1862 | |
1863 | /* Now we have a context, enable the step */ | |
1864 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1865 | ||
1866 | return (0); | |
1867 | } | |
1868 | ||
1869 | int | |
ca75d7de | 1870 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1871 | { |
1872 | gss_buffer_desc in; | |
1873 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1874 | OM_uint32 major, minor; |
7364bd04 | 1875 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1876 | u_int len; |
7364bd04 | 1877 | |
f99e1ca4 | 1878 | in.value = buffer_get_string(m, &len); |
1879 | in.length = len; | |
7364bd04 | 1880 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1881 | xfree(in.value); | |
1882 | ||
1883 | buffer_clear(m); | |
1884 | buffer_put_int(m, major); | |
1885 | buffer_put_string(m, out.value, out.length); | |
1886 | buffer_put_int(m, flags); | |
ca75d7de | 1887 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1888 | |
1889 | gss_release_buffer(&minor, &out); | |
1890 | ||
8442cc66 | 1891 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1892 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1893 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1894 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1895 | } |
1896 | return (0); | |
1897 | } | |
1898 | ||
0789992b | 1899 | int |
ca75d7de | 1900 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1901 | { |
1902 | gss_buffer_desc gssbuf, mic; | |
1903 | OM_uint32 ret; | |
1904 | u_int len; | |
b6453d99 | 1905 | |
0789992b | 1906 | gssbuf.value = buffer_get_string(m, &len); |
1907 | gssbuf.length = len; | |
1908 | mic.value = buffer_get_string(m, &len); | |
1909 | mic.length = len; | |
b6453d99 | 1910 | |
0789992b | 1911 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1912 | |
0789992b | 1913 | xfree(gssbuf.value); |
1914 | xfree(mic.value); | |
b6453d99 | 1915 | |
0789992b | 1916 | buffer_clear(m); |
1917 | buffer_put_int(m, ret); | |
b6453d99 | 1918 | |
ca75d7de | 1919 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1920 | |
0789992b | 1921 | if (!GSS_ERROR(ret)) |
1922 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1923 | |
0789992b | 1924 | return (0); |
1925 | } | |
1926 | ||
7364bd04 | 1927 | int |
ca75d7de | 1928 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1929 | { |
1930 | int authenticated; | |
1931 | ||
1932 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1933 | ||
1934 | buffer_clear(m); | |
1935 | buffer_put_int(m, authenticated); | |
1936 | ||
1937 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1938 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1939 | |
8442cc66 | 1940 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1941 | |
1942 | /* Monitor loop will terminate if authenticated */ | |
1943 | return (authenticated); | |
1944 | } | |
1945 | #endif /* GSSAPI */ |