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dc0cae51 | 1 | /* $OpenBSD: monitor.c,v 1.94 2007/10/29 04:08:08 dtucker 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> | |
536c14e8 | 31 | #include <sys/param.h> |
5b04a8bf | 32 | #include <sys/socket.h> |
31652869 | 33 | #include "openbsd-compat/sys-tree.h" |
aa2eae64 | 34 | #include <sys/wait.h> |
1853d1ef | 35 | |
028094f4 | 36 | #include <errno.h> |
d3221cca | 37 | #include <fcntl.h> |
b5b88c19 | 38 | #ifdef HAVE_PATHS_H |
a75f5360 | 39 | #include <paths.h> |
b5b88c19 | 40 | #endif |
b1842393 | 41 | #include <pwd.h> |
ada68823 | 42 | #include <signal.h> |
24436b92 | 43 | #include <stdarg.h> |
ffa517a8 | 44 | #include <stdlib.h> |
00146caa | 45 | #include <string.h> |
aa751414 | 46 | #include <unistd.h> |
1853d1ef | 47 | |
48 | #ifdef SKEY | |
49 | #include <skey.h> | |
50 | #endif | |
51 | ||
a75f5360 | 52 | #include <openssl/dh.h> |
53 | ||
31652869 | 54 | #include "xmalloc.h" |
1853d1ef | 55 | #include "ssh.h" |
31652869 | 56 | #include "key.h" |
57 | #include "buffer.h" | |
58 | #include "hostfile.h" | |
1853d1ef | 59 | #include "auth.h" |
31652869 | 60 | #include "cipher.h" |
1853d1ef | 61 | #include "kex.h" |
62 | #include "dh.h" | |
a655c012 | 63 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
64 | #undef TARGET_OS_MAC | |
9b08c23f | 65 | #include "zlib.h" |
a655c012 | 66 | #define TARGET_OS_MAC 1 |
67 | #else | |
68 | #include "zlib.h" | |
69 | #endif | |
1853d1ef | 70 | #include "packet.h" |
71 | #include "auth-options.h" | |
72 | #include "sshpty.h" | |
73 | #include "channels.h" | |
74 | #include "session.h" | |
75 | #include "sshlogin.h" | |
76 | #include "canohost.h" | |
77 | #include "log.h" | |
78 | #include "servconf.h" | |
79 | #include "monitor.h" | |
80 | #include "monitor_mm.h" | |
31652869 | 81 | #ifdef GSSAPI |
82 | #include "ssh-gss.h" | |
83 | #endif | |
1853d1ef | 84 | #include "monitor_wrap.h" |
85 | #include "monitor_fdpass.h" | |
1853d1ef | 86 | #include "misc.h" |
1853d1ef | 87 | #include "compat.h" |
88 | #include "ssh2.h" | |
1853d1ef | 89 | |
7364bd04 | 90 | #ifdef GSSAPI |
7364bd04 | 91 | static Gssctxt *gsscontext = NULL; |
92 | #endif | |
93 | ||
1853d1ef | 94 | /* Imports */ |
95 | extern ServerOptions options; | |
96 | extern u_int utmp_len; | |
97 | extern Newkeys *current_keys[]; | |
98 | extern z_stream incoming_stream; | |
99 | extern z_stream outgoing_stream; | |
100 | extern u_char session_id[]; | |
101 | extern Buffer input, output; | |
102 | extern Buffer auth_debug; | |
103 | extern int auth_debug_init; | |
be2ca0c9 | 104 | extern Buffer loginmsg; |
1853d1ef | 105 | |
106 | /* State exported from the child */ | |
107 | ||
108 | struct { | |
109 | z_stream incoming; | |
110 | z_stream outgoing; | |
111 | u_char *keyin; | |
112 | u_int keyinlen; | |
113 | u_char *keyout; | |
114 | u_int keyoutlen; | |
115 | u_char *ivin; | |
116 | u_int ivinlen; | |
117 | u_char *ivout; | |
118 | u_int ivoutlen; | |
9459414c | 119 | u_char *ssh1key; |
120 | u_int ssh1keylen; | |
1853d1ef | 121 | int ssh1cipher; |
122 | int ssh1protoflags; | |
123 | u_char *input; | |
124 | u_int ilen; | |
125 | u_char *output; | |
126 | u_int olen; | |
127 | } child_state; | |
128 | ||
b8e04133 | 129 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 130 | |
131 | int mm_answer_moduli(int, Buffer *); | |
132 | int mm_answer_sign(int, Buffer *); | |
133 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 134 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 135 | int mm_answer_authserv(int, Buffer *); |
136 | int mm_answer_authpassword(int, Buffer *); | |
137 | int mm_answer_bsdauthquery(int, Buffer *); | |
138 | int mm_answer_bsdauthrespond(int, Buffer *); | |
139 | int mm_answer_skeyquery(int, Buffer *); | |
140 | int mm_answer_skeyrespond(int, Buffer *); | |
141 | int mm_answer_keyallowed(int, Buffer *); | |
142 | int mm_answer_keyverify(int, Buffer *); | |
143 | int mm_answer_pty(int, Buffer *); | |
144 | int mm_answer_pty_cleanup(int, Buffer *); | |
145 | int mm_answer_term(int, Buffer *); | |
146 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
147 | int mm_answer_rsa_challenge(int, Buffer *); | |
148 | int mm_answer_rsa_response(int, Buffer *); | |
149 | int mm_answer_sesskey(int, Buffer *); | |
150 | int mm_answer_sessid(int, Buffer *); | |
151 | ||
ad200abb | 152 | #ifdef USE_PAM |
153 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 154 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 155 | int mm_answer_pam_init_ctx(int, Buffer *); |
156 | int mm_answer_pam_query(int, Buffer *); | |
157 | int mm_answer_pam_respond(int, Buffer *); | |
158 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 159 | #endif |
160 | ||
7364bd04 | 161 | #ifdef GSSAPI |
162 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
163 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
164 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 165 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 166 | #endif |
696f6bef | 167 | |
6039eeef | 168 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 169 | int mm_answer_audit_event(int, Buffer *); |
170 | int mm_answer_audit_command(int, Buffer *); | |
171 | #endif | |
172 | ||
1853d1ef | 173 | static Authctxt *authctxt; |
174 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
175 | ||
176 | /* local state for key verify */ | |
177 | static u_char *key_blob = NULL; | |
178 | static u_int key_bloblen = 0; | |
179 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 180 | static char *hostbased_cuser = NULL; |
181 | static char *hostbased_chost = NULL; | |
1853d1ef | 182 | static char *auth_method = "unknown"; |
a27002e5 | 183 | static u_int session_id2_len = 0; |
521d606b | 184 | static u_char *session_id2 = NULL; |
3a39206f | 185 | static pid_t monitor_child_pid; |
1853d1ef | 186 | |
187 | struct mon_table { | |
188 | enum monitor_reqtype type; | |
189 | int flags; | |
190 | int (*f)(int, Buffer *); | |
191 | }; | |
192 | ||
193 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
194 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
195 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 196 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 197 | |
198 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
199 | ||
200 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
201 | ||
202 | struct mon_table mon_dispatch_proto20[] = { | |
203 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
204 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
205 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
206 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 207 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 208 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 209 | #ifdef USE_PAM |
210 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 211 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 212 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
213 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
214 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
215 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 216 | #endif |
6039eeef | 217 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 218 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 219 | #endif |
1853d1ef | 220 | #ifdef BSD_AUTH |
221 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 222 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 223 | #endif |
224 | #ifdef SKEY | |
225 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
226 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
227 | #endif | |
228 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
229 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 230 | #ifdef GSSAPI |
231 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
232 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
233 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 234 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 235 | #endif |
1853d1ef | 236 | {0, 0, NULL} |
237 | }; | |
238 | ||
239 | struct mon_table mon_dispatch_postauth20[] = { | |
240 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
241 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
242 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
243 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
244 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 245 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 246 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
247 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
248 | #endif | |
1853d1ef | 249 | {0, 0, NULL} |
250 | }; | |
251 | ||
252 | struct mon_table mon_dispatch_proto15[] = { | |
253 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
254 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
255 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
256 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 257 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
258 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 259 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
260 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
261 | #ifdef BSD_AUTH | |
262 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 263 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 264 | #endif |
265 | #ifdef SKEY | |
266 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
267 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 268 | #endif |
269 | #ifdef USE_PAM | |
270 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 271 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 272 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
273 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
274 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
275 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 276 | #endif |
6039eeef | 277 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 278 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 279 | #endif |
280 | {0, 0, NULL} | |
281 | }; | |
282 | ||
283 | struct mon_table mon_dispatch_postauth15[] = { | |
284 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
285 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
286 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 287 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 288 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
bb09a477 | 289 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 290 | #endif |
1853d1ef | 291 | {0, 0, NULL} |
292 | }; | |
293 | ||
294 | struct mon_table *mon_dispatch; | |
295 | ||
296 | /* Specifies if a certain message is allowed at the moment */ | |
297 | ||
298 | static void | |
299 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
300 | { | |
301 | while (ent->f != NULL) { | |
302 | if (ent->type == type) { | |
303 | ent->flags &= ~MON_PERMIT; | |
304 | ent->flags |= permit ? MON_PERMIT : 0; | |
305 | return; | |
306 | } | |
307 | ent++; | |
308 | } | |
309 | } | |
310 | ||
311 | static void | |
312 | monitor_permit_authentications(int permit) | |
313 | { | |
314 | struct mon_table *ent = mon_dispatch; | |
315 | ||
316 | while (ent->f != NULL) { | |
317 | if (ent->flags & MON_AUTH) { | |
318 | ent->flags &= ~MON_PERMIT; | |
319 | ent->flags |= permit ? MON_PERMIT : 0; | |
320 | } | |
321 | ent++; | |
322 | } | |
323 | } | |
324 | ||
2362db19 | 325 | void |
326 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 327 | { |
328 | struct mon_table *ent; | |
329 | int authenticated = 0; | |
330 | ||
331 | debug3("preauth child monitor started"); | |
332 | ||
2362db19 | 333 | authctxt = _authctxt; |
334 | memset(authctxt, 0, sizeof(*authctxt)); | |
335 | ||
e05df884 | 336 | authctxt->loginmsg = &loginmsg; |
337 | ||
1853d1ef | 338 | if (compat20) { |
339 | mon_dispatch = mon_dispatch_proto20; | |
340 | ||
341 | /* Permit requests for moduli and signatures */ | |
342 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
343 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
344 | } else { | |
345 | mon_dispatch = mon_dispatch_proto15; | |
346 | ||
347 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
348 | } | |
349 | ||
1853d1ef | 350 | /* The first few requests do not require asynchronous access */ |
351 | while (!authenticated) { | |
c023a130 | 352 | auth_method = "unknown"; |
89916e8c | 353 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); |
1853d1ef | 354 | if (authenticated) { |
355 | if (!(ent->flags & MON_AUTHDECIDE)) | |
356 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 357 | __func__, ent->type); |
1853d1ef | 358 | if (authctxt->pw->pw_uid == 0 && |
359 | !auth_root_allowed(auth_method)) | |
360 | authenticated = 0; | |
5b9e2464 | 361 | #ifdef USE_PAM |
362 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 363 | if (options.use_pam && authenticated) { |
5b9e2464 | 364 | Buffer m; |
365 | ||
366 | buffer_init(&m); | |
aff51935 | 367 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 368 | MONITOR_REQ_PAM_ACCOUNT, &m); |
369 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
370 | buffer_free(&m); | |
371 | } | |
372 | #endif | |
1853d1ef | 373 | } |
374 | ||
c023a130 | 375 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 376 | auth_log(authctxt, authenticated, auth_method, |
377 | compat20 ? " ssh2" : ""); | |
378 | if (!authenticated) | |
379 | authctxt->failures++; | |
380 | } | |
381 | } | |
382 | ||
383 | if (!authctxt->valid) | |
1588c277 | 384 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 385 | if (strcmp(auth_method, "unknown") == 0) |
386 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 387 | |
388 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 389 | __func__, authctxt->user); |
1853d1ef | 390 | |
b5a28cbc | 391 | mm_get_keystate(pmonitor); |
1853d1ef | 392 | } |
393 | ||
3a39206f | 394 | static void |
395 | monitor_set_child_handler(pid_t pid) | |
396 | { | |
397 | monitor_child_pid = pid; | |
398 | } | |
399 | ||
400 | static void | |
ca75d7de | 401 | monitor_child_handler(int sig) |
3a39206f | 402 | { |
ca75d7de | 403 | kill(monitor_child_pid, sig); |
3a39206f | 404 | } |
405 | ||
1853d1ef | 406 | void |
b5a28cbc | 407 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 408 | { |
3a39206f | 409 | monitor_set_child_handler(pmonitor->m_pid); |
410 | signal(SIGHUP, &monitor_child_handler); | |
411 | signal(SIGTERM, &monitor_child_handler); | |
21cd42db | 412 | signal(SIGINT, &monitor_child_handler); |
3a39206f | 413 | |
1853d1ef | 414 | if (compat20) { |
415 | mon_dispatch = mon_dispatch_postauth20; | |
416 | ||
417 | /* Permit requests for moduli and signatures */ | |
418 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
419 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
420 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 421 | } else { |
422 | mon_dispatch = mon_dispatch_postauth15; | |
423 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
424 | } | |
425 | if (!no_pty_flag) { | |
426 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
427 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
428 | } | |
429 | ||
430 | for (;;) | |
b5a28cbc | 431 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 432 | } |
433 | ||
434 | void | |
b5a28cbc | 435 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 436 | { |
0496cf34 | 437 | if (options.compression) { |
438 | /* The member allocation is not visible, so sync it */ | |
439 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
440 | } | |
1853d1ef | 441 | } |
442 | ||
443 | int | |
b5a28cbc | 444 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 445 | struct mon_table **pent) |
446 | { | |
447 | Buffer m; | |
448 | int ret; | |
449 | u_char type; | |
450 | ||
451 | buffer_init(&m); | |
452 | ||
b5a28cbc | 453 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 454 | type = buffer_get_char(&m); |
455 | ||
1588c277 | 456 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 457 | |
458 | while (ent->f != NULL) { | |
459 | if (ent->type == type) | |
460 | break; | |
461 | ent++; | |
462 | } | |
463 | ||
464 | if (ent->f != NULL) { | |
465 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 466 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 467 | type); |
b5a28cbc | 468 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 469 | buffer_free(&m); |
470 | ||
471 | /* The child may use this request only once, disable it */ | |
472 | if (ent->flags & MON_ONCE) { | |
1588c277 | 473 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 474 | type); |
475 | ent->flags &= ~MON_PERMIT; | |
476 | } | |
477 | ||
478 | if (pent != NULL) | |
479 | *pent = ent; | |
480 | ||
481 | return ret; | |
482 | } | |
483 | ||
1588c277 | 484 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 485 | |
486 | /* NOTREACHED */ | |
487 | return (-1); | |
488 | } | |
489 | ||
490 | /* allowed key state */ | |
491 | static int | |
492 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
493 | { | |
494 | /* make sure key is allowed */ | |
495 | if (key_blob == NULL || key_bloblen != bloblen || | |
496 | memcmp(key_blob, blob, key_bloblen)) | |
497 | return (0); | |
498 | return (1); | |
499 | } | |
500 | ||
501 | static void | |
502 | monitor_reset_key_state(void) | |
503 | { | |
504 | /* reset state */ | |
505 | if (key_blob != NULL) | |
506 | xfree(key_blob); | |
507 | if (hostbased_cuser != NULL) | |
508 | xfree(hostbased_cuser); | |
509 | if (hostbased_chost != NULL) | |
510 | xfree(hostbased_chost); | |
511 | key_blob = NULL; | |
512 | key_bloblen = 0; | |
513 | key_blobtype = MM_NOKEY; | |
514 | hostbased_cuser = NULL; | |
515 | hostbased_chost = NULL; | |
516 | } | |
517 | ||
518 | int | |
ca75d7de | 519 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 520 | { |
521 | DH *dh; | |
522 | int min, want, max; | |
523 | ||
524 | min = buffer_get_int(m); | |
525 | want = buffer_get_int(m); | |
526 | max = buffer_get_int(m); | |
527 | ||
528 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 529 | __func__, min, want, max); |
1853d1ef | 530 | /* We need to check here, too, in case the child got corrupted */ |
531 | if (max < min || want < min || max < want) | |
532 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 533 | __func__, min, want, max); |
1853d1ef | 534 | |
535 | buffer_clear(m); | |
536 | ||
537 | dh = choose_dh(min, want, max); | |
538 | if (dh == NULL) { | |
539 | buffer_put_char(m, 0); | |
540 | return (0); | |
541 | } else { | |
542 | /* Send first bignum */ | |
543 | buffer_put_char(m, 1); | |
544 | buffer_put_bignum2(m, dh->p); | |
545 | buffer_put_bignum2(m, dh->g); | |
546 | ||
547 | DH_free(dh); | |
548 | } | |
ca75d7de | 549 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 550 | return (0); |
551 | } | |
552 | ||
553 | int | |
ca75d7de | 554 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 555 | { |
556 | Key *key; | |
557 | u_char *p; | |
558 | u_char *signature; | |
559 | u_int siglen, datlen; | |
560 | int keyid; | |
561 | ||
1588c277 | 562 | debug3("%s", __func__); |
1853d1ef | 563 | |
564 | keyid = buffer_get_int(m); | |
565 | p = buffer_get_string(m, &datlen); | |
566 | ||
2ff8003a | 567 | /* |
b4bbf172 | 568 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 569 | * SHA256 (32 byte) hashes |
570 | */ | |
571 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 572 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 573 | |
521d606b | 574 | /* save session id, it will be passed on the first call */ |
575 | if (session_id2_len == 0) { | |
576 | session_id2_len = datlen; | |
577 | session_id2 = xmalloc(session_id2_len); | |
578 | memcpy(session_id2, p, session_id2_len); | |
579 | } | |
580 | ||
1853d1ef | 581 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 582 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 583 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 584 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 585 | |
d1ff09ba | 586 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 587 | |
588 | buffer_clear(m); | |
589 | buffer_put_string(m, signature, siglen); | |
590 | ||
591 | xfree(p); | |
592 | xfree(signature); | |
593 | ||
ca75d7de | 594 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 595 | |
596 | /* Turn on permissions for getpwnam */ | |
597 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
598 | ||
599 | return (0); | |
600 | } | |
601 | ||
602 | /* Retrieves the password entry and also checks if the user is permitted */ | |
603 | ||
604 | int | |
ca75d7de | 605 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 606 | { |
18a8f313 | 607 | char *username; |
1853d1ef | 608 | struct passwd *pwent; |
609 | int allowed = 0; | |
610 | ||
1588c277 | 611 | debug3("%s", __func__); |
1853d1ef | 612 | |
613 | if (authctxt->attempt++ != 0) | |
1588c277 | 614 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 615 | |
18a8f313 | 616 | username = buffer_get_string(m, NULL); |
1853d1ef | 617 | |
18a8f313 | 618 | pwent = getpwnamallow(username); |
1853d1ef | 619 | |
18a8f313 | 620 | authctxt->user = xstrdup(username); |
621 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
622 | xfree(username); | |
1853d1ef | 623 | |
624 | buffer_clear(m); | |
625 | ||
626 | if (pwent == NULL) { | |
627 | buffer_put_char(m, 0); | |
b2a5802b | 628 | authctxt->pw = fakepw(); |
1853d1ef | 629 | goto out; |
630 | } | |
631 | ||
632 | allowed = 1; | |
633 | authctxt->pw = pwent; | |
634 | authctxt->valid = 1; | |
635 | ||
636 | buffer_put_char(m, 1); | |
637 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
638 | buffer_put_cstring(m, pwent->pw_name); | |
639 | buffer_put_cstring(m, "*"); | |
640 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 641 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 642 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 643 | #endif |
1853d1ef | 644 | buffer_put_cstring(m, pwent->pw_dir); |
645 | buffer_put_cstring(m, pwent->pw_shell); | |
dc0cae51 | 646 | |
647 | out: | |
03bcbf84 | 648 | buffer_put_string(m, &options, sizeof(options)); |
649 | if (options.banner != NULL) | |
650 | buffer_put_cstring(m, options.banner); | |
1588c277 | 651 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 652 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 653 | |
654 | /* For SSHv1 allow authentication now */ | |
655 | if (!compat20) | |
656 | monitor_permit_authentications(1); | |
94a73cdc | 657 | else { |
1853d1ef | 658 | /* Allow service/style information on the auth context */ |
659 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 660 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
661 | } | |
1853d1ef | 662 | |
efe44db6 | 663 | #ifdef USE_PAM |
7fceb20d | 664 | if (options.use_pam) |
665 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 666 | #endif |
1853d1ef | 667 | |
668 | return (0); | |
669 | } | |
670 | ||
ca75d7de | 671 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 672 | { |
673 | char *banner; | |
674 | ||
675 | buffer_clear(m); | |
676 | banner = auth2_read_banner(); | |
677 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 678 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 679 | |
680 | if (banner != NULL) | |
30e37ee6 | 681 | xfree(banner); |
94a73cdc | 682 | |
683 | return (0); | |
684 | } | |
685 | ||
1853d1ef | 686 | int |
ca75d7de | 687 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 688 | { |
689 | monitor_permit_authentications(1); | |
690 | ||
691 | authctxt->service = buffer_get_string(m, NULL); | |
692 | authctxt->style = buffer_get_string(m, NULL); | |
693 | debug3("%s: service=%s, style=%s", | |
1588c277 | 694 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 695 | |
696 | if (strlen(authctxt->style) == 0) { | |
697 | xfree(authctxt->style); | |
698 | authctxt->style = NULL; | |
699 | } | |
700 | ||
701 | return (0); | |
702 | } | |
703 | ||
704 | int | |
ca75d7de | 705 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 706 | { |
707 | static int call_count; | |
708 | char *passwd; | |
d341742a | 709 | int authenticated; |
710 | u_int plen; | |
1853d1ef | 711 | |
712 | passwd = buffer_get_string(m, &plen); | |
713 | /* Only authenticate if the context is valid */ | |
aa586f8e | 714 | authenticated = options.password_authentication && |
96d0bf74 | 715 | auth_password(authctxt, passwd); |
1853d1ef | 716 | memset(passwd, 0, strlen(passwd)); |
717 | xfree(passwd); | |
718 | ||
719 | buffer_clear(m); | |
720 | buffer_put_int(m, authenticated); | |
721 | ||
1588c277 | 722 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 723 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 724 | |
725 | call_count++; | |
726 | if (plen == 0 && call_count == 1) | |
727 | auth_method = "none"; | |
728 | else | |
729 | auth_method = "password"; | |
730 | ||
731 | /* Causes monitor loop to terminate if authenticated */ | |
732 | return (authenticated); | |
733 | } | |
734 | ||
735 | #ifdef BSD_AUTH | |
736 | int | |
ca75d7de | 737 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 738 | { |
739 | char *name, *infotxt; | |
740 | u_int numprompts; | |
741 | u_int *echo_on; | |
742 | char **prompts; | |
6d6c25e3 | 743 | u_int success; |
1853d1ef | 744 | |
6d6c25e3 | 745 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
746 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 747 | |
748 | buffer_clear(m); | |
6d6c25e3 | 749 | buffer_put_int(m, success); |
750 | if (success) | |
1853d1ef | 751 | buffer_put_cstring(m, prompts[0]); |
752 | ||
6d6c25e3 | 753 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 754 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 755 | |
6d6c25e3 | 756 | if (success) { |
1853d1ef | 757 | xfree(name); |
758 | xfree(infotxt); | |
759 | xfree(prompts); | |
760 | xfree(echo_on); | |
761 | } | |
762 | ||
763 | return (0); | |
764 | } | |
765 | ||
766 | int | |
ca75d7de | 767 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 768 | { |
769 | char *response; | |
770 | int authok; | |
771 | ||
772 | if (authctxt->as == 0) | |
1588c277 | 773 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 774 | |
775 | response = buffer_get_string(m, NULL); | |
aa586f8e | 776 | authok = options.challenge_response_authentication && |
777 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 778 | authctxt->as = NULL; |
1588c277 | 779 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 780 | xfree(response); |
781 | ||
782 | buffer_clear(m); | |
783 | buffer_put_int(m, authok); | |
784 | ||
1588c277 | 785 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 786 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 787 | |
788 | auth_method = "bsdauth"; | |
789 | ||
790 | return (authok != 0); | |
791 | } | |
792 | #endif | |
793 | ||
794 | #ifdef SKEY | |
795 | int | |
ca75d7de | 796 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 797 | { |
798 | struct skey skey; | |
799 | char challenge[1024]; | |
6d6c25e3 | 800 | u_int success; |
1853d1ef | 801 | |
f2b7b5c8 | 802 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
803 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 804 | |
805 | buffer_clear(m); | |
6d6c25e3 | 806 | buffer_put_int(m, success); |
807 | if (success) | |
1853d1ef | 808 | buffer_put_cstring(m, challenge); |
809 | ||
6d6c25e3 | 810 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 811 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 812 | |
813 | return (0); | |
814 | } | |
815 | ||
816 | int | |
ca75d7de | 817 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 818 | { |
819 | char *response; | |
820 | int authok; | |
821 | ||
822 | response = buffer_get_string(m, NULL); | |
823 | ||
aa586f8e | 824 | authok = (options.challenge_response_authentication && |
825 | authctxt->valid && | |
1853d1ef | 826 | skey_haskey(authctxt->pw->pw_name) == 0 && |
827 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
828 | ||
829 | xfree(response); | |
830 | ||
831 | buffer_clear(m); | |
832 | buffer_put_int(m, authok); | |
833 | ||
1588c277 | 834 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 835 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 836 | |
837 | auth_method = "skey"; | |
838 | ||
839 | return (authok != 0); | |
840 | } | |
841 | #endif | |
842 | ||
ad200abb | 843 | #ifdef USE_PAM |
844 | int | |
8b3ec5fd | 845 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 846 | { |
7fceb20d | 847 | if (!options.use_pam) |
848 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
849 | ||
529d73ab | 850 | start_pam(authctxt); |
ad200abb | 851 | |
5b9e2464 | 852 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
853 | ||
ad200abb | 854 | return (0); |
855 | } | |
05114c74 | 856 | |
5b9e2464 | 857 | int |
8b3ec5fd | 858 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 859 | { |
860 | u_int ret; | |
b6453d99 | 861 | |
5b9e2464 | 862 | if (!options.use_pam) |
863 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
864 | ||
865 | ret = do_pam_account(); | |
866 | ||
867 | buffer_put_int(m, ret); | |
cfb60d3a | 868 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 869 | |
8b3ec5fd | 870 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 871 | |
872 | return (ret); | |
873 | } | |
874 | ||
05114c74 | 875 | static void *sshpam_ctxt, *sshpam_authok; |
876 | extern KbdintDevice sshpam_device; | |
877 | ||
878 | int | |
8b3ec5fd | 879 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 880 | { |
881 | ||
882 | debug3("%s", __func__); | |
883 | authctxt->user = buffer_get_string(m, NULL); | |
884 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
885 | sshpam_authok = NULL; | |
886 | buffer_clear(m); | |
887 | if (sshpam_ctxt != NULL) { | |
888 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
889 | buffer_put_int(m, 1); | |
890 | } else { | |
891 | buffer_put_int(m, 0); | |
892 | } | |
8b3ec5fd | 893 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 894 | return (0); |
895 | } | |
896 | ||
897 | int | |
8b3ec5fd | 898 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 899 | { |
900 | char *name, *info, **prompts; | |
a1a073cc | 901 | u_int i, num, *echo_on; |
902 | int ret; | |
05114c74 | 903 | |
904 | debug3("%s", __func__); | |
905 | sshpam_authok = NULL; | |
906 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
907 | if (ret == 0 && num == 0) | |
908 | sshpam_authok = sshpam_ctxt; | |
909 | if (num > 1 || name == NULL || info == NULL) | |
910 | ret = -1; | |
911 | buffer_clear(m); | |
912 | buffer_put_int(m, ret); | |
913 | buffer_put_cstring(m, name); | |
914 | xfree(name); | |
915 | buffer_put_cstring(m, info); | |
916 | xfree(info); | |
917 | buffer_put_int(m, num); | |
918 | for (i = 0; i < num; ++i) { | |
919 | buffer_put_cstring(m, prompts[i]); | |
920 | xfree(prompts[i]); | |
921 | buffer_put_int(m, echo_on[i]); | |
922 | } | |
923 | if (prompts != NULL) | |
924 | xfree(prompts); | |
925 | if (echo_on != NULL) | |
926 | xfree(echo_on); | |
2ae7f715 | 927 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 928 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 929 | return (0); |
930 | } | |
931 | ||
932 | int | |
8b3ec5fd | 933 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 934 | { |
935 | char **resp; | |
a1a073cc | 936 | u_int i, num; |
937 | int ret; | |
05114c74 | 938 | |
939 | debug3("%s", __func__); | |
940 | sshpam_authok = NULL; | |
941 | num = buffer_get_int(m); | |
942 | if (num > 0) { | |
01d35895 | 943 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 944 | for (i = 0; i < num; ++i) |
945 | resp[i] = buffer_get_string(m, NULL); | |
946 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
947 | for (i = 0; i < num; ++i) | |
948 | xfree(resp[i]); | |
949 | xfree(resp); | |
950 | } else { | |
951 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
952 | } | |
953 | buffer_clear(m); | |
954 | buffer_put_int(m, ret); | |
8b3ec5fd | 955 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 956 | auth_method = "keyboard-interactive/pam"; |
957 | if (ret == 0) | |
958 | sshpam_authok = sshpam_ctxt; | |
959 | return (0); | |
960 | } | |
961 | ||
962 | int | |
8b3ec5fd | 963 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 964 | { |
965 | ||
966 | debug3("%s", __func__); | |
967 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
968 | buffer_clear(m); | |
8b3ec5fd | 969 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 970 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 971 | return (sshpam_authok == sshpam_ctxt); |
972 | } | |
ad200abb | 973 | #endif |
974 | ||
1853d1ef | 975 | static void |
976 | mm_append_debug(Buffer *m) | |
977 | { | |
978 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 979 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 980 | buffer_append(m, buffer_ptr(&auth_debug), |
981 | buffer_len(&auth_debug)); | |
982 | buffer_clear(&auth_debug); | |
983 | } | |
984 | } | |
985 | ||
986 | int | |
ca75d7de | 987 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 988 | { |
989 | Key *key; | |
661e45a0 | 990 | char *cuser, *chost; |
991 | u_char *blob; | |
1853d1ef | 992 | u_int bloblen; |
993 | enum mm_keytype type = 0; | |
994 | int allowed = 0; | |
995 | ||
1588c277 | 996 | debug3("%s entering", __func__); |
1853d1ef | 997 | |
998 | type = buffer_get_int(m); | |
999 | cuser = buffer_get_string(m, NULL); | |
1000 | chost = buffer_get_string(m, NULL); | |
1001 | blob = buffer_get_string(m, &bloblen); | |
1002 | ||
1003 | key = key_from_blob(blob, bloblen); | |
1004 | ||
1005 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1006 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 1007 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 1008 | |
1588c277 | 1009 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1010 | |
fdaef11e | 1011 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1012 | switch (type) { |
1853d1ef | 1013 | case MM_USERKEY: |
aa586f8e | 1014 | allowed = options.pubkey_authentication && |
1015 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1016 | auth_method = "publickey"; |
1853d1ef | 1017 | break; |
1018 | case MM_HOSTKEY: | |
aa586f8e | 1019 | allowed = options.hostbased_authentication && |
1020 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1021 | cuser, chost, key); |
c023a130 | 1022 | auth_method = "hostbased"; |
1853d1ef | 1023 | break; |
1024 | case MM_RSAHOSTKEY: | |
1025 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1026 | allowed = options.rhosts_rsa_authentication && |
1027 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1028 | cuser, chost, key); |
c023a130 | 1029 | auth_method = "rsa"; |
1853d1ef | 1030 | break; |
1031 | default: | |
1588c277 | 1032 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1033 | break; |
1034 | } | |
1853d1ef | 1035 | } |
3e2f2431 | 1036 | if (key != NULL) |
1037 | key_free(key); | |
1853d1ef | 1038 | |
1039 | /* clear temporarily storage (used by verify) */ | |
1040 | monitor_reset_key_state(); | |
1041 | ||
1042 | if (allowed) { | |
1043 | /* Save temporarily for comparison in verify */ | |
1044 | key_blob = blob; | |
1045 | key_bloblen = bloblen; | |
1046 | key_blobtype = type; | |
1047 | hostbased_cuser = cuser; | |
1048 | hostbased_chost = chost; | |
98d40a74 | 1049 | } else { |
c023a130 | 1050 | /* Log failed attempt */ |
1051 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1052 | xfree(blob); |
1053 | xfree(cuser); | |
1054 | xfree(chost); | |
1853d1ef | 1055 | } |
1056 | ||
1057 | debug3("%s: key %p is %s", | |
1588c277 | 1058 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1059 | |
1060 | buffer_clear(m); | |
1061 | buffer_put_int(m, allowed); | |
92e15201 | 1062 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1063 | |
1064 | mm_append_debug(m); | |
1065 | ||
ca75d7de | 1066 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1067 | |
1068 | if (type == MM_RSAHOSTKEY) | |
1069 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1070 | ||
1071 | return (0); | |
1072 | } | |
1073 | ||
1074 | static int | |
1075 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1076 | { | |
1077 | Buffer b; | |
661e45a0 | 1078 | char *p; |
1853d1ef | 1079 | u_int len; |
1080 | int fail = 0; | |
1853d1ef | 1081 | |
1082 | buffer_init(&b); | |
1083 | buffer_append(&b, data, datalen); | |
1084 | ||
1085 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1086 | p = buffer_ptr(&b); |
1087 | len = buffer_len(&b); | |
1088 | if ((session_id2 == NULL) || | |
1089 | (len < session_id2_len) || | |
1090 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1091 | fail++; | |
1853d1ef | 1092 | buffer_consume(&b, session_id2_len); |
1093 | } else { | |
521d606b | 1094 | p = buffer_get_string(&b, &len); |
1095 | if ((session_id2 == NULL) || | |
1096 | (len != session_id2_len) || | |
1097 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1098 | fail++; |
521d606b | 1099 | xfree(p); |
1853d1ef | 1100 | } |
1101 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1102 | fail++; | |
1103 | p = buffer_get_string(&b, NULL); | |
1104 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1105 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1106 | authctxt->user, p); |
1107 | fail++; | |
1108 | } | |
1109 | xfree(p); | |
1110 | buffer_skip_string(&b); | |
1111 | if (datafellows & SSH_BUG_PKAUTH) { | |
1112 | if (!buffer_get_char(&b)) | |
1113 | fail++; | |
1114 | } else { | |
1115 | p = buffer_get_string(&b, NULL); | |
1116 | if (strcmp("publickey", p) != 0) | |
1117 | fail++; | |
1118 | xfree(p); | |
1119 | if (!buffer_get_char(&b)) | |
1120 | fail++; | |
1121 | buffer_skip_string(&b); | |
1122 | } | |
1123 | buffer_skip_string(&b); | |
1124 | if (buffer_len(&b) != 0) | |
1125 | fail++; | |
1126 | buffer_free(&b); | |
1127 | return (fail == 0); | |
1128 | } | |
1129 | ||
1130 | static int | |
661e45a0 | 1131 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1132 | char *chost) | |
1853d1ef | 1133 | { |
1134 | Buffer b; | |
661e45a0 | 1135 | char *p; |
1853d1ef | 1136 | u_int len; |
1137 | int fail = 0; | |
1853d1ef | 1138 | |
1139 | buffer_init(&b); | |
1140 | buffer_append(&b, data, datalen); | |
1141 | ||
521d606b | 1142 | p = buffer_get_string(&b, &len); |
1143 | if ((session_id2 == NULL) || | |
1144 | (len != session_id2_len) || | |
1145 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1146 | fail++; |
521d606b | 1147 | xfree(p); |
1148 | ||
1853d1ef | 1149 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1150 | fail++; | |
1151 | p = buffer_get_string(&b, NULL); | |
1152 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1153 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1154 | authctxt->user, p); |
1155 | fail++; | |
1156 | } | |
1157 | xfree(p); | |
1158 | buffer_skip_string(&b); /* service */ | |
1159 | p = buffer_get_string(&b, NULL); | |
1160 | if (strcmp(p, "hostbased") != 0) | |
1161 | fail++; | |
1162 | xfree(p); | |
1163 | buffer_skip_string(&b); /* pkalg */ | |
1164 | buffer_skip_string(&b); /* pkblob */ | |
1165 | ||
1166 | /* verify client host, strip trailing dot if necessary */ | |
1167 | p = buffer_get_string(&b, NULL); | |
1168 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1169 | p[len - 1] = '\0'; | |
1170 | if (strcmp(p, chost) != 0) | |
1171 | fail++; | |
1172 | xfree(p); | |
1173 | ||
1174 | /* verify client user */ | |
1175 | p = buffer_get_string(&b, NULL); | |
1176 | if (strcmp(p, cuser) != 0) | |
1177 | fail++; | |
1178 | xfree(p); | |
1179 | ||
1180 | if (buffer_len(&b) != 0) | |
1181 | fail++; | |
1182 | buffer_free(&b); | |
1183 | return (fail == 0); | |
1184 | } | |
1185 | ||
1186 | int | |
ca75d7de | 1187 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1188 | { |
1189 | Key *key; | |
1190 | u_char *signature, *data, *blob; | |
1191 | u_int signaturelen, datalen, bloblen; | |
1192 | int verified = 0; | |
1193 | int valid_data = 0; | |
1194 | ||
1195 | blob = buffer_get_string(m, &bloblen); | |
1196 | signature = buffer_get_string(m, &signaturelen); | |
1197 | data = buffer_get_string(m, &datalen); | |
1198 | ||
1199 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1200 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1201 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1202 | |
1203 | key = key_from_blob(blob, bloblen); | |
1204 | if (key == NULL) | |
1588c277 | 1205 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1206 | |
1207 | switch (key_blobtype) { | |
1208 | case MM_USERKEY: | |
1209 | valid_data = monitor_valid_userblob(data, datalen); | |
1210 | break; | |
1211 | case MM_HOSTKEY: | |
1212 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1213 | hostbased_cuser, hostbased_chost); | |
1214 | break; | |
1215 | default: | |
1216 | valid_data = 0; | |
1217 | break; | |
1218 | } | |
1219 | if (!valid_data) | |
1588c277 | 1220 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1221 | |
1222 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1223 | debug3("%s: key %p signature %s", | |
89916e8c | 1224 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
1853d1ef | 1225 | |
1226 | key_free(key); | |
1227 | xfree(blob); | |
1228 | xfree(signature); | |
1229 | xfree(data); | |
1230 | ||
d17ef027 | 1231 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1232 | ||
1853d1ef | 1233 | monitor_reset_key_state(); |
1234 | ||
1235 | buffer_clear(m); | |
1236 | buffer_put_int(m, verified); | |
ca75d7de | 1237 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1238 | |
89916e8c | 1239 | return (verified == 1); |
1853d1ef | 1240 | } |
1241 | ||
1242 | static void | |
1243 | mm_record_login(Session *s, struct passwd *pw) | |
1244 | { | |
1245 | socklen_t fromlen; | |
1246 | struct sockaddr_storage from; | |
1247 | ||
1248 | /* | |
1249 | * Get IP address of client. If the connection is not a socket, let | |
1250 | * the address be 0.0.0.0. | |
1251 | */ | |
1252 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1253 | fromlen = sizeof(from); |
1853d1ef | 1254 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1255 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1256 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1257 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1258 | cleanup_exit(255); |
1853d1ef | 1259 | } |
1260 | } | |
1261 | /* Record that there was a login on that tty from the remote host. */ | |
1262 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1263 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1264 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1265 | } |
1266 | ||
1267 | static void | |
1268 | mm_session_close(Session *s) | |
1269 | { | |
b9ed513a | 1270 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1271 | if (s->ttyfd != -1) { |
c56969f9 | 1272 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1273 | session_pty_cleanup2(s); |
1274 | } | |
1275 | s->used = 0; | |
1276 | } | |
1277 | ||
1278 | int | |
ca75d7de | 1279 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1280 | { |
b5a28cbc | 1281 | extern struct monitor *pmonitor; |
1853d1ef | 1282 | Session *s; |
1283 | int res, fd0; | |
1284 | ||
1588c277 | 1285 | debug3("%s entering", __func__); |
1853d1ef | 1286 | |
1287 | buffer_clear(m); | |
1288 | s = session_new(); | |
1289 | if (s == NULL) | |
1290 | goto error; | |
1291 | s->authctxt = authctxt; | |
1292 | s->pw = authctxt->pw; | |
b5a28cbc | 1293 | s->pid = pmonitor->m_pid; |
1853d1ef | 1294 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1295 | if (res == 0) | |
1296 | goto error; | |
1853d1ef | 1297 | pty_setowner(authctxt->pw, s->tty); |
1298 | ||
1299 | buffer_put_int(m, 1); | |
1300 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1301 | |
1302 | /* We need to trick ttyslot */ | |
1303 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1304 | fatal("%s: dup2", __func__); |
1853d1ef | 1305 | |
1306 | mm_record_login(s, authctxt->pw); | |
1307 | ||
1308 | /* Now we can close the file descriptor again */ | |
1309 | close(0); | |
1310 | ||
be2ca0c9 | 1311 | /* send messages generated by record_login */ |
1312 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1313 | buffer_clear(&loginmsg); | |
1314 | ||
1315 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1316 | ||
8de7aaab | 1317 | if (mm_send_fd(sock, s->ptyfd) == -1 || |
1318 | mm_send_fd(sock, s->ttyfd) == -1) | |
1319 | fatal("%s: send fds failed", __func__); | |
be2ca0c9 | 1320 | |
1853d1ef | 1321 | /* make sure nothing uses fd 0 */ |
1322 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1323 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1324 | if (fd0 != 0) |
1588c277 | 1325 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1326 | |
1327 | /* slave is not needed */ | |
1328 | close(s->ttyfd); | |
1329 | s->ttyfd = s->ptyfd; | |
1330 | /* no need to dup() because nobody closes ptyfd */ | |
1331 | s->ptymaster = s->ptyfd; | |
1332 | ||
c56969f9 | 1333 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1334 | |
1335 | return (0); | |
1336 | ||
1337 | error: | |
1338 | if (s != NULL) | |
1339 | mm_session_close(s); | |
1340 | buffer_put_int(m, 0); | |
ca75d7de | 1341 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1342 | return (0); |
1343 | } | |
1344 | ||
1345 | int | |
ca75d7de | 1346 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1347 | { |
1348 | Session *s; | |
1349 | char *tty; | |
1350 | ||
1588c277 | 1351 | debug3("%s entering", __func__); |
1853d1ef | 1352 | |
1353 | tty = buffer_get_string(m, NULL); | |
1354 | if ((s = session_by_tty(tty)) != NULL) | |
1355 | mm_session_close(s); | |
1356 | buffer_clear(m); | |
1357 | xfree(tty); | |
1358 | return (0); | |
1359 | } | |
1360 | ||
1361 | int | |
ca75d7de | 1362 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1363 | { |
1364 | BIGNUM *p; | |
1365 | int rsafail; | |
1366 | ||
1367 | /* Turn off permissions */ | |
75cccc2c | 1368 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1369 | |
1370 | if ((p = BN_new()) == NULL) | |
1588c277 | 1371 | fatal("%s: BN_new", __func__); |
1853d1ef | 1372 | |
1373 | buffer_get_bignum2(m, p); | |
1374 | ||
1375 | rsafail = ssh1_session_key(p); | |
1376 | ||
1377 | buffer_clear(m); | |
1378 | buffer_put_int(m, rsafail); | |
1379 | buffer_put_bignum2(m, p); | |
1380 | ||
1381 | BN_clear_free(p); | |
1382 | ||
ca75d7de | 1383 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1384 | |
1385 | /* Turn on permissions for sessid passing */ | |
1386 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1387 | ||
1388 | return (0); | |
1389 | } | |
1390 | ||
1391 | int | |
ca75d7de | 1392 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1393 | { |
1394 | int i; | |
1395 | ||
1588c277 | 1396 | debug3("%s entering", __func__); |
1853d1ef | 1397 | |
1398 | if (buffer_len(m) != 16) | |
1588c277 | 1399 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1400 | for (i = 0; i < 16; i++) |
1401 | session_id[i] = buffer_get_char(m); | |
1402 | ||
1403 | /* Turn on permissions for getpwnam */ | |
1404 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1405 | ||
1406 | return (0); | |
1407 | } | |
1408 | ||
1409 | int | |
ca75d7de | 1410 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1411 | { |
1412 | BIGNUM *client_n; | |
1413 | Key *key = NULL; | |
1414 | u_char *blob = NULL; | |
1415 | u_int blen = 0; | |
1416 | int allowed = 0; | |
1417 | ||
1588c277 | 1418 | debug3("%s entering", __func__); |
1853d1ef | 1419 | |
c023a130 | 1420 | auth_method = "rsa"; |
aa586f8e | 1421 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1422 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1423 | fatal("%s: BN_new", __func__); |
1853d1ef | 1424 | buffer_get_bignum2(m, client_n); |
1425 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1426 | BN_clear_free(client_n); | |
1427 | } | |
1428 | buffer_clear(m); | |
1429 | buffer_put_int(m, allowed); | |
92e15201 | 1430 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1431 | |
1432 | /* clear temporarily storage (used by generate challenge) */ | |
1433 | monitor_reset_key_state(); | |
1434 | ||
1435 | if (allowed && key != NULL) { | |
1436 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1437 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1438 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1439 | buffer_put_string(m, blob, blen); |
1440 | ||
1441 | /* Save temporarily for comparison in verify */ | |
1442 | key_blob = blob; | |
1443 | key_bloblen = blen; | |
1444 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1445 | } |
3e2f2431 | 1446 | if (key != NULL) |
1447 | key_free(key); | |
1853d1ef | 1448 | |
1449 | mm_append_debug(m); | |
1450 | ||
ca75d7de | 1451 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1452 | |
1453 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1454 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1455 | return (0); | |
1456 | } | |
1457 | ||
1458 | int | |
ca75d7de | 1459 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1460 | { |
1461 | Key *key = NULL; | |
1462 | u_char *blob; | |
1463 | u_int blen; | |
1464 | ||
1588c277 | 1465 | debug3("%s entering", __func__); |
1853d1ef | 1466 | |
1467 | if (!authctxt->valid) | |
1588c277 | 1468 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1469 | blob = buffer_get_string(m, &blen); |
1470 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1471 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1472 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1473 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1474 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1475 | fatal("%s: received bad key", __func__); |
1853d1ef | 1476 | |
1477 | if (ssh1_challenge) | |
1478 | BN_clear_free(ssh1_challenge); | |
1479 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1480 | ||
1481 | buffer_clear(m); | |
1482 | buffer_put_bignum2(m, ssh1_challenge); | |
1483 | ||
1588c277 | 1484 | debug3("%s sending reply", __func__); |
ca75d7de | 1485 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1486 | |
1487 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1488 | |
1489 | xfree(blob); | |
1490 | key_free(key); | |
1853d1ef | 1491 | return (0); |
1492 | } | |
1493 | ||
1494 | int | |
ca75d7de | 1495 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1496 | { |
1497 | Key *key = NULL; | |
1498 | u_char *blob, *response; | |
1499 | u_int blen, len; | |
1500 | int success; | |
1501 | ||
1588c277 | 1502 | debug3("%s entering", __func__); |
1853d1ef | 1503 | |
1504 | if (!authctxt->valid) | |
1588c277 | 1505 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1506 | if (ssh1_challenge == NULL) |
1588c277 | 1507 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1508 | |
1509 | blob = buffer_get_string(m, &blen); | |
1510 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1511 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1512 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1513 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1514 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1515 | fatal("%s: received bad key", __func__); |
1853d1ef | 1516 | response = buffer_get_string(m, &len); |
1517 | if (len != 16) | |
1588c277 | 1518 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1519 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1520 | ||
3e2f2431 | 1521 | xfree(blob); |
1853d1ef | 1522 | key_free(key); |
1523 | xfree(response); | |
1524 | ||
1525 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1526 | ||
1527 | /* reset state */ | |
1528 | BN_clear_free(ssh1_challenge); | |
1529 | ssh1_challenge = NULL; | |
1530 | monitor_reset_key_state(); | |
1531 | ||
1532 | buffer_clear(m); | |
1533 | buffer_put_int(m, success); | |
ca75d7de | 1534 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1535 | |
1536 | return (success); | |
1537 | } | |
1538 | ||
1539 | int | |
ca75d7de | 1540 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1541 | { |
b5a28cbc | 1542 | extern struct monitor *pmonitor; |
1853d1ef | 1543 | int res, status; |
1544 | ||
1588c277 | 1545 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1546 | |
1547 | /* The child is terminating */ | |
1548 | session_destroy_all(&mm_session_close); | |
1549 | ||
b5a28cbc | 1550 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1551 | if (errno != EINTR) |
1552 | exit(1); | |
1853d1ef | 1553 | |
1554 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1555 | ||
1556 | /* Terminate process */ | |
f6be21a0 | 1557 | exit(res); |
1853d1ef | 1558 | } |
1559 | ||
6039eeef | 1560 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1561 | /* Report that an audit event occurred */ |
1562 | int | |
1563 | mm_answer_audit_event(int socket, Buffer *m) | |
1564 | { | |
1565 | ssh_audit_event_t event; | |
1566 | ||
1567 | debug3("%s entering", __func__); | |
1568 | ||
1569 | event = buffer_get_int(m); | |
c00e4d75 | 1570 | switch(event) { |
6039eeef | 1571 | case SSH_AUTH_FAIL_PUBKEY: |
1572 | case SSH_AUTH_FAIL_HOSTBASED: | |
1573 | case SSH_AUTH_FAIL_GSSAPI: | |
1574 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1575 | case SSH_LOGIN_ROOT_DENIED: | |
1576 | case SSH_CONNECTION_CLOSE: | |
1577 | case SSH_INVALID_USER: | |
c00e4d75 | 1578 | audit_event(event); |
1579 | break; | |
1580 | default: | |
1581 | fatal("Audit event type %d not permitted", event); | |
1582 | } | |
1583 | ||
1584 | return (0); | |
1585 | } | |
1586 | ||
1587 | int | |
1588 | mm_answer_audit_command(int socket, Buffer *m) | |
1589 | { | |
1590 | u_int len; | |
1591 | char *cmd; | |
1592 | ||
1593 | debug3("%s entering", __func__); | |
1594 | cmd = buffer_get_string(m, &len); | |
1595 | /* sanity check command, if so how? */ | |
1596 | audit_run_command(cmd); | |
1597 | xfree(cmd); | |
c00e4d75 | 1598 | return (0); |
1599 | } | |
6039eeef | 1600 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1601 | |
1853d1ef | 1602 | void |
b5a28cbc | 1603 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1604 | { |
1605 | if (compat20) { | |
1606 | set_newkeys(MODE_IN); | |
1607 | set_newkeys(MODE_OUT); | |
1608 | } else { | |
1853d1ef | 1609 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1610 | packet_set_encryption_key(child_state.ssh1key, |
1611 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1612 | xfree(child_state.ssh1key); | |
1853d1ef | 1613 | } |
1614 | ||
9459414c | 1615 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1616 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1617 | xfree(child_state.keyout); | |
1618 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1619 | xfree(child_state.keyin); | |
1620 | ||
1621 | if (!compat20) { | |
1622 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1623 | xfree(child_state.ivout); | |
1624 | packet_set_iv(MODE_IN, child_state.ivin); | |
1625 | xfree(child_state.ivin); | |
1626 | } | |
1627 | ||
1628 | memcpy(&incoming_stream, &child_state.incoming, | |
1629 | sizeof(incoming_stream)); | |
1630 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1631 | sizeof(outgoing_stream)); | |
1632 | ||
1633 | /* Update with new address */ | |
0496cf34 | 1634 | if (options.compression) |
1635 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1636 | |
1637 | /* Network I/O buffers */ | |
1638 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1639 | buffer_clear(&input); | |
1640 | buffer_append(&input, child_state.input, child_state.ilen); | |
1641 | memset(child_state.input, 0, child_state.ilen); | |
1642 | xfree(child_state.input); | |
1643 | ||
1644 | buffer_clear(&output); | |
1645 | buffer_append(&output, child_state.output, child_state.olen); | |
1646 | memset(child_state.output, 0, child_state.olen); | |
1647 | xfree(child_state.output); | |
1648 | } | |
1649 | ||
1650 | static Kex * | |
1651 | mm_get_kex(Buffer *m) | |
1652 | { | |
1653 | Kex *kex; | |
1654 | void *blob; | |
1655 | u_int bloblen; | |
1656 | ||
52e3daed | 1657 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1658 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1659 | if ((session_id2 == NULL) || |
1660 | (kex->session_id_len != session_id2_len) || | |
1661 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1662 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1663 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1664 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1665 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1666 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1667 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1668 | kex->server = 1; |
1669 | kex->hostkey_type = buffer_get_int(m); | |
1670 | kex->kex_type = buffer_get_int(m); | |
1671 | blob = buffer_get_string(m, &bloblen); | |
1672 | buffer_init(&kex->my); | |
1673 | buffer_append(&kex->my, blob, bloblen); | |
1674 | xfree(blob); | |
1675 | blob = buffer_get_string(m, &bloblen); | |
1676 | buffer_init(&kex->peer); | |
1677 | buffer_append(&kex->peer, blob, bloblen); | |
1678 | xfree(blob); | |
1679 | kex->done = 1; | |
1680 | kex->flags = buffer_get_int(m); | |
1681 | kex->client_version_string = buffer_get_string(m, NULL); | |
1682 | kex->server_version_string = buffer_get_string(m, NULL); | |
1683 | kex->load_host_key=&get_hostkey_by_type; | |
1684 | kex->host_key_index=&get_hostkey_index; | |
1685 | ||
1686 | return (kex); | |
1687 | } | |
1688 | ||
1689 | /* This function requries careful sanity checking */ | |
1690 | ||
1691 | void | |
b5a28cbc | 1692 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1693 | { |
1694 | Buffer m; | |
1695 | u_char *blob, *p; | |
1696 | u_int bloblen, plen; | |
ffd7b36b | 1697 | u_int32_t seqnr, packets; |
1698 | u_int64_t blocks; | |
1853d1ef | 1699 | |
1588c277 | 1700 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1701 | |
1702 | buffer_init(&m); | |
b5a28cbc | 1703 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1704 | if (!compat20) { |
1705 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1706 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1707 | child_state.ssh1key = buffer_get_string(&m, |
1708 | &child_state.ssh1keylen); | |
1853d1ef | 1709 | child_state.ivout = buffer_get_string(&m, |
1710 | &child_state.ivoutlen); | |
1711 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1712 | goto skip; | |
1713 | } else { | |
1714 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1715 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1716 | } |
1717 | ||
1718 | blob = buffer_get_string(&m, &bloblen); | |
1719 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1720 | xfree(blob); | |
1721 | ||
1588c277 | 1722 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1723 | blob = buffer_get_string(&m, &bloblen); |
1724 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1725 | xfree(blob); | |
1726 | ||
1727 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1728 | seqnr = buffer_get_int(&m); |
1729 | blocks = buffer_get_int64(&m); | |
1730 | packets = buffer_get_int(&m); | |
1731 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1732 | seqnr = buffer_get_int(&m); | |
1733 | blocks = buffer_get_int64(&m); | |
1734 | packets = buffer_get_int(&m); | |
1735 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1736 | |
1737 | skip: | |
1738 | /* Get the key context */ | |
1739 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1740 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1741 | ||
1588c277 | 1742 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1743 | /* Get compression state */ |
1744 | p = buffer_get_string(&m, &plen); | |
1745 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1746 | fatal("%s: bad request size", __func__); |
1853d1ef | 1747 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1748 | xfree(p); | |
1749 | ||
1750 | p = buffer_get_string(&m, &plen); | |
1751 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1752 | fatal("%s: bad request size", __func__); |
1853d1ef | 1753 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1754 | xfree(p); | |
1755 | ||
1756 | /* Network I/O buffers */ | |
1588c277 | 1757 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1758 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1759 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1760 | ||
1761 | buffer_free(&m); | |
1762 | } | |
1763 | ||
1764 | ||
1765 | /* Allocation functions for zlib */ | |
1766 | void * | |
1767 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1768 | { | |
39e71188 | 1769 | size_t len = (size_t) size * ncount; |
1853d1ef | 1770 | void *address; |
1771 | ||
b85698ab | 1772 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1773 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1774 | ||
1775 | address = mm_malloc(mm, len); | |
1853d1ef | 1776 | |
1777 | return (address); | |
1778 | } | |
1779 | ||
1780 | void | |
1781 | mm_zfree(struct mm_master *mm, void *address) | |
1782 | { | |
1783 | mm_free(mm, address); | |
1784 | } | |
1785 | ||
1786 | void | |
1787 | mm_init_compression(struct mm_master *mm) | |
1788 | { | |
1789 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1790 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1791 | outgoing_stream.opaque = mm; | |
1792 | ||
1793 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1794 | incoming_stream.zfree = (free_func)mm_zfree; | |
1795 | incoming_stream.opaque = mm; | |
1796 | } | |
1797 | ||
1798 | /* XXX */ | |
1799 | ||
1800 | #define FD_CLOSEONEXEC(x) do { \ | |
1801 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1802 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1803 | } while (0) | |
1804 | ||
1805 | static void | |
1806 | monitor_socketpair(int *pair) | |
1807 | { | |
f1af2dbf | 1808 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1809 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1810 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1811 | #else |
1812 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1813 | __func__); |
f1af2dbf | 1814 | #endif |
1853d1ef | 1815 | FD_CLOSEONEXEC(pair[0]); |
1816 | FD_CLOSEONEXEC(pair[1]); | |
1817 | } | |
1818 | ||
1819 | #define MM_MEMSIZE 65536 | |
1820 | ||
1821 | struct monitor * | |
1822 | monitor_init(void) | |
1823 | { | |
1824 | struct monitor *mon; | |
1825 | int pair[2]; | |
1826 | ||
52e3daed | 1827 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1828 | |
1829 | monitor_socketpair(pair); | |
1830 | ||
1831 | mon->m_recvfd = pair[0]; | |
1832 | mon->m_sendfd = pair[1]; | |
1833 | ||
1834 | /* Used to share zlib space across processes */ | |
0496cf34 | 1835 | if (options.compression) { |
1836 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1837 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1838 | |
0496cf34 | 1839 | /* Compression needs to share state across borders */ |
1840 | mm_init_compression(mon->m_zlib); | |
1841 | } | |
1853d1ef | 1842 | |
1843 | return mon; | |
1844 | } | |
1845 | ||
1846 | void | |
1847 | monitor_reinit(struct monitor *mon) | |
1848 | { | |
1849 | int pair[2]; | |
1850 | ||
1851 | monitor_socketpair(pair); | |
1852 | ||
1853 | mon->m_recvfd = pair[0]; | |
1854 | mon->m_sendfd = pair[1]; | |
1855 | } | |
7364bd04 | 1856 | |
1857 | #ifdef GSSAPI | |
1858 | int | |
ca75d7de | 1859 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1860 | { |
ca75d7de | 1861 | gss_OID_desc goid; |
7364bd04 | 1862 | OM_uint32 major; |
1863 | u_int len; | |
1864 | ||
ca75d7de | 1865 | goid.elements = buffer_get_string(m, &len); |
1866 | goid.length = len; | |
7364bd04 | 1867 | |
ca75d7de | 1868 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1869 | |
ca75d7de | 1870 | xfree(goid.elements); |
7364bd04 | 1871 | |
1872 | buffer_clear(m); | |
1873 | buffer_put_int(m, major); | |
1874 | ||
8442cc66 | 1875 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1876 | |
1877 | /* Now we have a context, enable the step */ | |
1878 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1879 | ||
1880 | return (0); | |
1881 | } | |
1882 | ||
1883 | int | |
ca75d7de | 1884 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1885 | { |
1886 | gss_buffer_desc in; | |
1887 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1888 | OM_uint32 major, minor; |
7364bd04 | 1889 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1890 | u_int len; |
7364bd04 | 1891 | |
f99e1ca4 | 1892 | in.value = buffer_get_string(m, &len); |
1893 | in.length = len; | |
7364bd04 | 1894 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1895 | xfree(in.value); | |
1896 | ||
1897 | buffer_clear(m); | |
1898 | buffer_put_int(m, major); | |
1899 | buffer_put_string(m, out.value, out.length); | |
1900 | buffer_put_int(m, flags); | |
ca75d7de | 1901 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1902 | |
1903 | gss_release_buffer(&minor, &out); | |
1904 | ||
8442cc66 | 1905 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1906 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1907 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1908 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1909 | } |
1910 | return (0); | |
1911 | } | |
1912 | ||
0789992b | 1913 | int |
ca75d7de | 1914 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1915 | { |
1916 | gss_buffer_desc gssbuf, mic; | |
1917 | OM_uint32 ret; | |
1918 | u_int len; | |
b6453d99 | 1919 | |
0789992b | 1920 | gssbuf.value = buffer_get_string(m, &len); |
1921 | gssbuf.length = len; | |
1922 | mic.value = buffer_get_string(m, &len); | |
1923 | mic.length = len; | |
b6453d99 | 1924 | |
0789992b | 1925 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1926 | |
0789992b | 1927 | xfree(gssbuf.value); |
1928 | xfree(mic.value); | |
b6453d99 | 1929 | |
0789992b | 1930 | buffer_clear(m); |
1931 | buffer_put_int(m, ret); | |
b6453d99 | 1932 | |
ca75d7de | 1933 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1934 | |
0789992b | 1935 | if (!GSS_ERROR(ret)) |
1936 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1937 | |
0789992b | 1938 | return (0); |
1939 | } | |
1940 | ||
7364bd04 | 1941 | int |
ca75d7de | 1942 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1943 | { |
1944 | int authenticated; | |
1945 | ||
1946 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1947 | ||
1948 | buffer_clear(m); | |
1949 | buffer_put_int(m, authenticated); | |
1950 | ||
1951 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1952 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1953 | |
8442cc66 | 1954 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1955 | |
1956 | /* Monitor loop will terminate if authenticated */ | |
1957 | return (authenticated); | |
1958 | } | |
1959 | #endif /* GSSAPI */ |