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03bcbf84 | 1 | /* $OpenBSD: monitor.c,v 1.90 2007/02/19 10:45:58 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); | |
412 | ||
1853d1ef | 413 | if (compat20) { |
414 | mon_dispatch = mon_dispatch_postauth20; | |
415 | ||
416 | /* Permit requests for moduli and signatures */ | |
417 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
418 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
419 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 420 | } else { |
421 | mon_dispatch = mon_dispatch_postauth15; | |
422 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
423 | } | |
424 | if (!no_pty_flag) { | |
425 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
426 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
427 | } | |
428 | ||
429 | for (;;) | |
b5a28cbc | 430 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 431 | } |
432 | ||
433 | void | |
b5a28cbc | 434 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 435 | { |
0496cf34 | 436 | if (options.compression) { |
437 | /* The member allocation is not visible, so sync it */ | |
438 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
439 | } | |
1853d1ef | 440 | } |
441 | ||
442 | int | |
b5a28cbc | 443 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 444 | struct mon_table **pent) |
445 | { | |
446 | Buffer m; | |
447 | int ret; | |
448 | u_char type; | |
449 | ||
450 | buffer_init(&m); | |
451 | ||
b5a28cbc | 452 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 453 | type = buffer_get_char(&m); |
454 | ||
1588c277 | 455 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 456 | |
457 | while (ent->f != NULL) { | |
458 | if (ent->type == type) | |
459 | break; | |
460 | ent++; | |
461 | } | |
462 | ||
463 | if (ent->f != NULL) { | |
464 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 465 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 466 | type); |
b5a28cbc | 467 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 468 | buffer_free(&m); |
469 | ||
470 | /* The child may use this request only once, disable it */ | |
471 | if (ent->flags & MON_ONCE) { | |
1588c277 | 472 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 473 | type); |
474 | ent->flags &= ~MON_PERMIT; | |
475 | } | |
476 | ||
477 | if (pent != NULL) | |
478 | *pent = ent; | |
479 | ||
480 | return ret; | |
481 | } | |
482 | ||
1588c277 | 483 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 484 | |
485 | /* NOTREACHED */ | |
486 | return (-1); | |
487 | } | |
488 | ||
489 | /* allowed key state */ | |
490 | static int | |
491 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
492 | { | |
493 | /* make sure key is allowed */ | |
494 | if (key_blob == NULL || key_bloblen != bloblen || | |
495 | memcmp(key_blob, blob, key_bloblen)) | |
496 | return (0); | |
497 | return (1); | |
498 | } | |
499 | ||
500 | static void | |
501 | monitor_reset_key_state(void) | |
502 | { | |
503 | /* reset state */ | |
504 | if (key_blob != NULL) | |
505 | xfree(key_blob); | |
506 | if (hostbased_cuser != NULL) | |
507 | xfree(hostbased_cuser); | |
508 | if (hostbased_chost != NULL) | |
509 | xfree(hostbased_chost); | |
510 | key_blob = NULL; | |
511 | key_bloblen = 0; | |
512 | key_blobtype = MM_NOKEY; | |
513 | hostbased_cuser = NULL; | |
514 | hostbased_chost = NULL; | |
515 | } | |
516 | ||
517 | int | |
ca75d7de | 518 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 519 | { |
520 | DH *dh; | |
521 | int min, want, max; | |
522 | ||
523 | min = buffer_get_int(m); | |
524 | want = buffer_get_int(m); | |
525 | max = buffer_get_int(m); | |
526 | ||
527 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 528 | __func__, min, want, max); |
1853d1ef | 529 | /* We need to check here, too, in case the child got corrupted */ |
530 | if (max < min || want < min || max < want) | |
531 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 532 | __func__, min, want, max); |
1853d1ef | 533 | |
534 | buffer_clear(m); | |
535 | ||
536 | dh = choose_dh(min, want, max); | |
537 | if (dh == NULL) { | |
538 | buffer_put_char(m, 0); | |
539 | return (0); | |
540 | } else { | |
541 | /* Send first bignum */ | |
542 | buffer_put_char(m, 1); | |
543 | buffer_put_bignum2(m, dh->p); | |
544 | buffer_put_bignum2(m, dh->g); | |
545 | ||
546 | DH_free(dh); | |
547 | } | |
ca75d7de | 548 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 549 | return (0); |
550 | } | |
551 | ||
552 | int | |
ca75d7de | 553 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 554 | { |
555 | Key *key; | |
556 | u_char *p; | |
557 | u_char *signature; | |
558 | u_int siglen, datlen; | |
559 | int keyid; | |
560 | ||
1588c277 | 561 | debug3("%s", __func__); |
1853d1ef | 562 | |
563 | keyid = buffer_get_int(m); | |
564 | p = buffer_get_string(m, &datlen); | |
565 | ||
2ff8003a | 566 | /* |
b4bbf172 | 567 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 568 | * SHA256 (32 byte) hashes |
569 | */ | |
570 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 571 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 572 | |
521d606b | 573 | /* save session id, it will be passed on the first call */ |
574 | if (session_id2_len == 0) { | |
575 | session_id2_len = datlen; | |
576 | session_id2 = xmalloc(session_id2_len); | |
577 | memcpy(session_id2, p, session_id2_len); | |
578 | } | |
579 | ||
1853d1ef | 580 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 581 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 582 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 583 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 584 | |
d1ff09ba | 585 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 586 | |
587 | buffer_clear(m); | |
588 | buffer_put_string(m, signature, siglen); | |
589 | ||
590 | xfree(p); | |
591 | xfree(signature); | |
592 | ||
ca75d7de | 593 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 594 | |
595 | /* Turn on permissions for getpwnam */ | |
596 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
597 | ||
598 | return (0); | |
599 | } | |
600 | ||
601 | /* Retrieves the password entry and also checks if the user is permitted */ | |
602 | ||
603 | int | |
ca75d7de | 604 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 605 | { |
18a8f313 | 606 | char *username; |
1853d1ef | 607 | struct passwd *pwent; |
608 | int allowed = 0; | |
609 | ||
1588c277 | 610 | debug3("%s", __func__); |
1853d1ef | 611 | |
612 | if (authctxt->attempt++ != 0) | |
1588c277 | 613 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 614 | |
18a8f313 | 615 | username = buffer_get_string(m, NULL); |
1853d1ef | 616 | |
18a8f313 | 617 | pwent = getpwnamallow(username); |
1853d1ef | 618 | |
18a8f313 | 619 | authctxt->user = xstrdup(username); |
620 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
621 | xfree(username); | |
1853d1ef | 622 | |
623 | buffer_clear(m); | |
624 | ||
625 | if (pwent == NULL) { | |
626 | buffer_put_char(m, 0); | |
b2a5802b | 627 | authctxt->pw = fakepw(); |
1853d1ef | 628 | goto out; |
629 | } | |
630 | ||
631 | allowed = 1; | |
632 | authctxt->pw = pwent; | |
633 | authctxt->valid = 1; | |
634 | ||
635 | buffer_put_char(m, 1); | |
636 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
637 | buffer_put_cstring(m, pwent->pw_name); | |
638 | buffer_put_cstring(m, "*"); | |
639 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 640 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 641 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 642 | #endif |
1853d1ef | 643 | buffer_put_cstring(m, pwent->pw_dir); |
644 | buffer_put_cstring(m, pwent->pw_shell); | |
03bcbf84 | 645 | buffer_put_string(m, &options, sizeof(options)); |
646 | if (options.banner != NULL) | |
647 | buffer_put_cstring(m, options.banner); | |
1853d1ef | 648 | |
649 | out: | |
1588c277 | 650 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 651 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 652 | |
653 | /* For SSHv1 allow authentication now */ | |
654 | if (!compat20) | |
655 | monitor_permit_authentications(1); | |
94a73cdc | 656 | else { |
1853d1ef | 657 | /* Allow service/style information on the auth context */ |
658 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 659 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
660 | } | |
1853d1ef | 661 | |
efe44db6 | 662 | #ifdef USE_PAM |
7fceb20d | 663 | if (options.use_pam) |
664 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 665 | #endif |
1853d1ef | 666 | |
667 | return (0); | |
668 | } | |
669 | ||
ca75d7de | 670 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 671 | { |
672 | char *banner; | |
673 | ||
674 | buffer_clear(m); | |
675 | banner = auth2_read_banner(); | |
676 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 677 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 678 | |
679 | if (banner != NULL) | |
30e37ee6 | 680 | xfree(banner); |
94a73cdc | 681 | |
682 | return (0); | |
683 | } | |
684 | ||
1853d1ef | 685 | int |
ca75d7de | 686 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 687 | { |
688 | monitor_permit_authentications(1); | |
689 | ||
690 | authctxt->service = buffer_get_string(m, NULL); | |
691 | authctxt->style = buffer_get_string(m, NULL); | |
692 | debug3("%s: service=%s, style=%s", | |
1588c277 | 693 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 694 | |
695 | if (strlen(authctxt->style) == 0) { | |
696 | xfree(authctxt->style); | |
697 | authctxt->style = NULL; | |
698 | } | |
699 | ||
700 | return (0); | |
701 | } | |
702 | ||
703 | int | |
ca75d7de | 704 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 705 | { |
706 | static int call_count; | |
707 | char *passwd; | |
d341742a | 708 | int authenticated; |
709 | u_int plen; | |
1853d1ef | 710 | |
711 | passwd = buffer_get_string(m, &plen); | |
712 | /* Only authenticate if the context is valid */ | |
aa586f8e | 713 | authenticated = options.password_authentication && |
96d0bf74 | 714 | auth_password(authctxt, passwd); |
1853d1ef | 715 | memset(passwd, 0, strlen(passwd)); |
716 | xfree(passwd); | |
717 | ||
718 | buffer_clear(m); | |
719 | buffer_put_int(m, authenticated); | |
720 | ||
1588c277 | 721 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 722 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 723 | |
724 | call_count++; | |
725 | if (plen == 0 && call_count == 1) | |
726 | auth_method = "none"; | |
727 | else | |
728 | auth_method = "password"; | |
729 | ||
730 | /* Causes monitor loop to terminate if authenticated */ | |
731 | return (authenticated); | |
732 | } | |
733 | ||
734 | #ifdef BSD_AUTH | |
735 | int | |
ca75d7de | 736 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 737 | { |
738 | char *name, *infotxt; | |
739 | u_int numprompts; | |
740 | u_int *echo_on; | |
741 | char **prompts; | |
6d6c25e3 | 742 | u_int success; |
1853d1ef | 743 | |
6d6c25e3 | 744 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
745 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 746 | |
747 | buffer_clear(m); | |
6d6c25e3 | 748 | buffer_put_int(m, success); |
749 | if (success) | |
1853d1ef | 750 | buffer_put_cstring(m, prompts[0]); |
751 | ||
6d6c25e3 | 752 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 753 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 754 | |
6d6c25e3 | 755 | if (success) { |
1853d1ef | 756 | xfree(name); |
757 | xfree(infotxt); | |
758 | xfree(prompts); | |
759 | xfree(echo_on); | |
760 | } | |
761 | ||
762 | return (0); | |
763 | } | |
764 | ||
765 | int | |
ca75d7de | 766 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 767 | { |
768 | char *response; | |
769 | int authok; | |
770 | ||
771 | if (authctxt->as == 0) | |
1588c277 | 772 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 773 | |
774 | response = buffer_get_string(m, NULL); | |
aa586f8e | 775 | authok = options.challenge_response_authentication && |
776 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 777 | authctxt->as = NULL; |
1588c277 | 778 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 779 | xfree(response); |
780 | ||
781 | buffer_clear(m); | |
782 | buffer_put_int(m, authok); | |
783 | ||
1588c277 | 784 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 785 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 786 | |
787 | auth_method = "bsdauth"; | |
788 | ||
789 | return (authok != 0); | |
790 | } | |
791 | #endif | |
792 | ||
793 | #ifdef SKEY | |
794 | int | |
ca75d7de | 795 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 796 | { |
797 | struct skey skey; | |
798 | char challenge[1024]; | |
6d6c25e3 | 799 | u_int success; |
1853d1ef | 800 | |
f2b7b5c8 | 801 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
802 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 803 | |
804 | buffer_clear(m); | |
6d6c25e3 | 805 | buffer_put_int(m, success); |
806 | if (success) | |
1853d1ef | 807 | buffer_put_cstring(m, challenge); |
808 | ||
6d6c25e3 | 809 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 810 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 811 | |
812 | return (0); | |
813 | } | |
814 | ||
815 | int | |
ca75d7de | 816 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 817 | { |
818 | char *response; | |
819 | int authok; | |
820 | ||
821 | response = buffer_get_string(m, NULL); | |
822 | ||
aa586f8e | 823 | authok = (options.challenge_response_authentication && |
824 | authctxt->valid && | |
1853d1ef | 825 | skey_haskey(authctxt->pw->pw_name) == 0 && |
826 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
827 | ||
828 | xfree(response); | |
829 | ||
830 | buffer_clear(m); | |
831 | buffer_put_int(m, authok); | |
832 | ||
1588c277 | 833 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 834 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 835 | |
836 | auth_method = "skey"; | |
837 | ||
838 | return (authok != 0); | |
839 | } | |
840 | #endif | |
841 | ||
ad200abb | 842 | #ifdef USE_PAM |
843 | int | |
8b3ec5fd | 844 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 845 | { |
7fceb20d | 846 | if (!options.use_pam) |
847 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
848 | ||
529d73ab | 849 | start_pam(authctxt); |
ad200abb | 850 | |
5b9e2464 | 851 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
852 | ||
ad200abb | 853 | return (0); |
854 | } | |
05114c74 | 855 | |
5b9e2464 | 856 | int |
8b3ec5fd | 857 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 858 | { |
859 | u_int ret; | |
b6453d99 | 860 | |
5b9e2464 | 861 | if (!options.use_pam) |
862 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
863 | ||
864 | ret = do_pam_account(); | |
865 | ||
866 | buffer_put_int(m, ret); | |
cfb60d3a | 867 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 868 | |
8b3ec5fd | 869 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 870 | |
871 | return (ret); | |
872 | } | |
873 | ||
05114c74 | 874 | static void *sshpam_ctxt, *sshpam_authok; |
875 | extern KbdintDevice sshpam_device; | |
876 | ||
877 | int | |
8b3ec5fd | 878 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 879 | { |
880 | ||
881 | debug3("%s", __func__); | |
882 | authctxt->user = buffer_get_string(m, NULL); | |
883 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
884 | sshpam_authok = NULL; | |
885 | buffer_clear(m); | |
886 | if (sshpam_ctxt != NULL) { | |
887 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
888 | buffer_put_int(m, 1); | |
889 | } else { | |
890 | buffer_put_int(m, 0); | |
891 | } | |
8b3ec5fd | 892 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 893 | return (0); |
894 | } | |
895 | ||
896 | int | |
8b3ec5fd | 897 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 898 | { |
899 | char *name, *info, **prompts; | |
a1a073cc | 900 | u_int i, num, *echo_on; |
901 | int ret; | |
05114c74 | 902 | |
903 | debug3("%s", __func__); | |
904 | sshpam_authok = NULL; | |
905 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
906 | if (ret == 0 && num == 0) | |
907 | sshpam_authok = sshpam_ctxt; | |
908 | if (num > 1 || name == NULL || info == NULL) | |
909 | ret = -1; | |
910 | buffer_clear(m); | |
911 | buffer_put_int(m, ret); | |
912 | buffer_put_cstring(m, name); | |
913 | xfree(name); | |
914 | buffer_put_cstring(m, info); | |
915 | xfree(info); | |
916 | buffer_put_int(m, num); | |
917 | for (i = 0; i < num; ++i) { | |
918 | buffer_put_cstring(m, prompts[i]); | |
919 | xfree(prompts[i]); | |
920 | buffer_put_int(m, echo_on[i]); | |
921 | } | |
922 | if (prompts != NULL) | |
923 | xfree(prompts); | |
924 | if (echo_on != NULL) | |
925 | xfree(echo_on); | |
2ae7f715 | 926 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 927 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 928 | return (0); |
929 | } | |
930 | ||
931 | int | |
8b3ec5fd | 932 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 933 | { |
934 | char **resp; | |
a1a073cc | 935 | u_int i, num; |
936 | int ret; | |
05114c74 | 937 | |
938 | debug3("%s", __func__); | |
939 | sshpam_authok = NULL; | |
940 | num = buffer_get_int(m); | |
941 | if (num > 0) { | |
01d35895 | 942 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 943 | for (i = 0; i < num; ++i) |
944 | resp[i] = buffer_get_string(m, NULL); | |
945 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
946 | for (i = 0; i < num; ++i) | |
947 | xfree(resp[i]); | |
948 | xfree(resp); | |
949 | } else { | |
950 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
951 | } | |
952 | buffer_clear(m); | |
953 | buffer_put_int(m, ret); | |
8b3ec5fd | 954 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 955 | auth_method = "keyboard-interactive/pam"; |
956 | if (ret == 0) | |
957 | sshpam_authok = sshpam_ctxt; | |
958 | return (0); | |
959 | } | |
960 | ||
961 | int | |
8b3ec5fd | 962 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 963 | { |
964 | ||
965 | debug3("%s", __func__); | |
966 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
967 | buffer_clear(m); | |
8b3ec5fd | 968 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 969 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 970 | return (sshpam_authok == sshpam_ctxt); |
971 | } | |
ad200abb | 972 | #endif |
973 | ||
1853d1ef | 974 | static void |
975 | mm_append_debug(Buffer *m) | |
976 | { | |
977 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 978 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 979 | buffer_append(m, buffer_ptr(&auth_debug), |
980 | buffer_len(&auth_debug)); | |
981 | buffer_clear(&auth_debug); | |
982 | } | |
983 | } | |
984 | ||
985 | int | |
ca75d7de | 986 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 987 | { |
988 | Key *key; | |
661e45a0 | 989 | char *cuser, *chost; |
990 | u_char *blob; | |
1853d1ef | 991 | u_int bloblen; |
992 | enum mm_keytype type = 0; | |
993 | int allowed = 0; | |
994 | ||
1588c277 | 995 | debug3("%s entering", __func__); |
1853d1ef | 996 | |
997 | type = buffer_get_int(m); | |
998 | cuser = buffer_get_string(m, NULL); | |
999 | chost = buffer_get_string(m, NULL); | |
1000 | blob = buffer_get_string(m, &bloblen); | |
1001 | ||
1002 | key = key_from_blob(blob, bloblen); | |
1003 | ||
1004 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1005 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 1006 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 1007 | |
1588c277 | 1008 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1009 | |
fdaef11e | 1010 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1011 | switch (type) { |
1853d1ef | 1012 | case MM_USERKEY: |
aa586f8e | 1013 | allowed = options.pubkey_authentication && |
1014 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1015 | auth_method = "publickey"; |
1853d1ef | 1016 | break; |
1017 | case MM_HOSTKEY: | |
aa586f8e | 1018 | allowed = options.hostbased_authentication && |
1019 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1020 | cuser, chost, key); |
c023a130 | 1021 | auth_method = "hostbased"; |
1853d1ef | 1022 | break; |
1023 | case MM_RSAHOSTKEY: | |
1024 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1025 | allowed = options.rhosts_rsa_authentication && |
1026 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1027 | cuser, chost, key); |
c023a130 | 1028 | auth_method = "rsa"; |
1853d1ef | 1029 | break; |
1030 | default: | |
1588c277 | 1031 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1032 | break; |
1033 | } | |
1853d1ef | 1034 | } |
3e2f2431 | 1035 | if (key != NULL) |
1036 | key_free(key); | |
1853d1ef | 1037 | |
1038 | /* clear temporarily storage (used by verify) */ | |
1039 | monitor_reset_key_state(); | |
1040 | ||
1041 | if (allowed) { | |
1042 | /* Save temporarily for comparison in verify */ | |
1043 | key_blob = blob; | |
1044 | key_bloblen = bloblen; | |
1045 | key_blobtype = type; | |
1046 | hostbased_cuser = cuser; | |
1047 | hostbased_chost = chost; | |
98d40a74 | 1048 | } else { |
c023a130 | 1049 | /* Log failed attempt */ |
1050 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1051 | xfree(blob); |
1052 | xfree(cuser); | |
1053 | xfree(chost); | |
1853d1ef | 1054 | } |
1055 | ||
1056 | debug3("%s: key %p is %s", | |
1588c277 | 1057 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1058 | |
1059 | buffer_clear(m); | |
1060 | buffer_put_int(m, allowed); | |
92e15201 | 1061 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1062 | |
1063 | mm_append_debug(m); | |
1064 | ||
ca75d7de | 1065 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1066 | |
1067 | if (type == MM_RSAHOSTKEY) | |
1068 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1069 | ||
1070 | return (0); | |
1071 | } | |
1072 | ||
1073 | static int | |
1074 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1075 | { | |
1076 | Buffer b; | |
661e45a0 | 1077 | char *p; |
1853d1ef | 1078 | u_int len; |
1079 | int fail = 0; | |
1853d1ef | 1080 | |
1081 | buffer_init(&b); | |
1082 | buffer_append(&b, data, datalen); | |
1083 | ||
1084 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1085 | p = buffer_ptr(&b); |
1086 | len = buffer_len(&b); | |
1087 | if ((session_id2 == NULL) || | |
1088 | (len < session_id2_len) || | |
1089 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1090 | fail++; | |
1853d1ef | 1091 | buffer_consume(&b, session_id2_len); |
1092 | } else { | |
521d606b | 1093 | p = buffer_get_string(&b, &len); |
1094 | if ((session_id2 == NULL) || | |
1095 | (len != session_id2_len) || | |
1096 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1097 | fail++; |
521d606b | 1098 | xfree(p); |
1853d1ef | 1099 | } |
1100 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1101 | fail++; | |
1102 | p = buffer_get_string(&b, NULL); | |
1103 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1104 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1105 | authctxt->user, p); |
1106 | fail++; | |
1107 | } | |
1108 | xfree(p); | |
1109 | buffer_skip_string(&b); | |
1110 | if (datafellows & SSH_BUG_PKAUTH) { | |
1111 | if (!buffer_get_char(&b)) | |
1112 | fail++; | |
1113 | } else { | |
1114 | p = buffer_get_string(&b, NULL); | |
1115 | if (strcmp("publickey", p) != 0) | |
1116 | fail++; | |
1117 | xfree(p); | |
1118 | if (!buffer_get_char(&b)) | |
1119 | fail++; | |
1120 | buffer_skip_string(&b); | |
1121 | } | |
1122 | buffer_skip_string(&b); | |
1123 | if (buffer_len(&b) != 0) | |
1124 | fail++; | |
1125 | buffer_free(&b); | |
1126 | return (fail == 0); | |
1127 | } | |
1128 | ||
1129 | static int | |
661e45a0 | 1130 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1131 | char *chost) | |
1853d1ef | 1132 | { |
1133 | Buffer b; | |
661e45a0 | 1134 | char *p; |
1853d1ef | 1135 | u_int len; |
1136 | int fail = 0; | |
1853d1ef | 1137 | |
1138 | buffer_init(&b); | |
1139 | buffer_append(&b, data, datalen); | |
1140 | ||
521d606b | 1141 | p = buffer_get_string(&b, &len); |
1142 | if ((session_id2 == NULL) || | |
1143 | (len != session_id2_len) || | |
1144 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1145 | fail++; |
521d606b | 1146 | xfree(p); |
1147 | ||
1853d1ef | 1148 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1149 | fail++; | |
1150 | p = buffer_get_string(&b, NULL); | |
1151 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1152 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1153 | authctxt->user, p); |
1154 | fail++; | |
1155 | } | |
1156 | xfree(p); | |
1157 | buffer_skip_string(&b); /* service */ | |
1158 | p = buffer_get_string(&b, NULL); | |
1159 | if (strcmp(p, "hostbased") != 0) | |
1160 | fail++; | |
1161 | xfree(p); | |
1162 | buffer_skip_string(&b); /* pkalg */ | |
1163 | buffer_skip_string(&b); /* pkblob */ | |
1164 | ||
1165 | /* verify client host, strip trailing dot if necessary */ | |
1166 | p = buffer_get_string(&b, NULL); | |
1167 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1168 | p[len - 1] = '\0'; | |
1169 | if (strcmp(p, chost) != 0) | |
1170 | fail++; | |
1171 | xfree(p); | |
1172 | ||
1173 | /* verify client user */ | |
1174 | p = buffer_get_string(&b, NULL); | |
1175 | if (strcmp(p, cuser) != 0) | |
1176 | fail++; | |
1177 | xfree(p); | |
1178 | ||
1179 | if (buffer_len(&b) != 0) | |
1180 | fail++; | |
1181 | buffer_free(&b); | |
1182 | return (fail == 0); | |
1183 | } | |
1184 | ||
1185 | int | |
ca75d7de | 1186 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1187 | { |
1188 | Key *key; | |
1189 | u_char *signature, *data, *blob; | |
1190 | u_int signaturelen, datalen, bloblen; | |
1191 | int verified = 0; | |
1192 | int valid_data = 0; | |
1193 | ||
1194 | blob = buffer_get_string(m, &bloblen); | |
1195 | signature = buffer_get_string(m, &signaturelen); | |
1196 | data = buffer_get_string(m, &datalen); | |
1197 | ||
1198 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1199 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1200 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1201 | |
1202 | key = key_from_blob(blob, bloblen); | |
1203 | if (key == NULL) | |
1588c277 | 1204 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1205 | |
1206 | switch (key_blobtype) { | |
1207 | case MM_USERKEY: | |
1208 | valid_data = monitor_valid_userblob(data, datalen); | |
1209 | break; | |
1210 | case MM_HOSTKEY: | |
1211 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1212 | hostbased_cuser, hostbased_chost); | |
1213 | break; | |
1214 | default: | |
1215 | valid_data = 0; | |
1216 | break; | |
1217 | } | |
1218 | if (!valid_data) | |
1588c277 | 1219 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1220 | |
1221 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1222 | debug3("%s: key %p signature %s", | |
89916e8c | 1223 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
1853d1ef | 1224 | |
1225 | key_free(key); | |
1226 | xfree(blob); | |
1227 | xfree(signature); | |
1228 | xfree(data); | |
1229 | ||
d17ef027 | 1230 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1231 | ||
1853d1ef | 1232 | monitor_reset_key_state(); |
1233 | ||
1234 | buffer_clear(m); | |
1235 | buffer_put_int(m, verified); | |
ca75d7de | 1236 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1237 | |
89916e8c | 1238 | return (verified == 1); |
1853d1ef | 1239 | } |
1240 | ||
1241 | static void | |
1242 | mm_record_login(Session *s, struct passwd *pw) | |
1243 | { | |
1244 | socklen_t fromlen; | |
1245 | struct sockaddr_storage from; | |
1246 | ||
1247 | /* | |
1248 | * Get IP address of client. If the connection is not a socket, let | |
1249 | * the address be 0.0.0.0. | |
1250 | */ | |
1251 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1252 | fromlen = sizeof(from); |
1853d1ef | 1253 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1254 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1255 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1256 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1257 | cleanup_exit(255); |
1853d1ef | 1258 | } |
1259 | } | |
1260 | /* Record that there was a login on that tty from the remote host. */ | |
1261 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1262 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1263 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1264 | } |
1265 | ||
1266 | static void | |
1267 | mm_session_close(Session *s) | |
1268 | { | |
b9ed513a | 1269 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1270 | if (s->ttyfd != -1) { |
c56969f9 | 1271 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1272 | session_pty_cleanup2(s); |
1273 | } | |
1274 | s->used = 0; | |
1275 | } | |
1276 | ||
1277 | int | |
ca75d7de | 1278 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1279 | { |
b5a28cbc | 1280 | extern struct monitor *pmonitor; |
1853d1ef | 1281 | Session *s; |
1282 | int res, fd0; | |
1283 | ||
1588c277 | 1284 | debug3("%s entering", __func__); |
1853d1ef | 1285 | |
1286 | buffer_clear(m); | |
1287 | s = session_new(); | |
1288 | if (s == NULL) | |
1289 | goto error; | |
1290 | s->authctxt = authctxt; | |
1291 | s->pw = authctxt->pw; | |
b5a28cbc | 1292 | s->pid = pmonitor->m_pid; |
1853d1ef | 1293 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1294 | if (res == 0) | |
1295 | goto error; | |
1853d1ef | 1296 | pty_setowner(authctxt->pw, s->tty); |
1297 | ||
1298 | buffer_put_int(m, 1); | |
1299 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1300 | |
1301 | /* We need to trick ttyslot */ | |
1302 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1303 | fatal("%s: dup2", __func__); |
1853d1ef | 1304 | |
1305 | mm_record_login(s, authctxt->pw); | |
1306 | ||
1307 | /* Now we can close the file descriptor again */ | |
1308 | close(0); | |
1309 | ||
be2ca0c9 | 1310 | /* send messages generated by record_login */ |
1311 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1312 | buffer_clear(&loginmsg); | |
1313 | ||
1314 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1315 | ||
1316 | mm_send_fd(sock, s->ptyfd); | |
1317 | mm_send_fd(sock, s->ttyfd); | |
1318 | ||
1853d1ef | 1319 | /* make sure nothing uses fd 0 */ |
1320 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1321 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1322 | if (fd0 != 0) |
1588c277 | 1323 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1324 | |
1325 | /* slave is not needed */ | |
1326 | close(s->ttyfd); | |
1327 | s->ttyfd = s->ptyfd; | |
1328 | /* no need to dup() because nobody closes ptyfd */ | |
1329 | s->ptymaster = s->ptyfd; | |
1330 | ||
c56969f9 | 1331 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1332 | |
1333 | return (0); | |
1334 | ||
1335 | error: | |
1336 | if (s != NULL) | |
1337 | mm_session_close(s); | |
1338 | buffer_put_int(m, 0); | |
ca75d7de | 1339 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1340 | return (0); |
1341 | } | |
1342 | ||
1343 | int | |
ca75d7de | 1344 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1345 | { |
1346 | Session *s; | |
1347 | char *tty; | |
1348 | ||
1588c277 | 1349 | debug3("%s entering", __func__); |
1853d1ef | 1350 | |
1351 | tty = buffer_get_string(m, NULL); | |
1352 | if ((s = session_by_tty(tty)) != NULL) | |
1353 | mm_session_close(s); | |
1354 | buffer_clear(m); | |
1355 | xfree(tty); | |
1356 | return (0); | |
1357 | } | |
1358 | ||
1359 | int | |
ca75d7de | 1360 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1361 | { |
1362 | BIGNUM *p; | |
1363 | int rsafail; | |
1364 | ||
1365 | /* Turn off permissions */ | |
75cccc2c | 1366 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1367 | |
1368 | if ((p = BN_new()) == NULL) | |
1588c277 | 1369 | fatal("%s: BN_new", __func__); |
1853d1ef | 1370 | |
1371 | buffer_get_bignum2(m, p); | |
1372 | ||
1373 | rsafail = ssh1_session_key(p); | |
1374 | ||
1375 | buffer_clear(m); | |
1376 | buffer_put_int(m, rsafail); | |
1377 | buffer_put_bignum2(m, p); | |
1378 | ||
1379 | BN_clear_free(p); | |
1380 | ||
ca75d7de | 1381 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1382 | |
1383 | /* Turn on permissions for sessid passing */ | |
1384 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1385 | ||
1386 | return (0); | |
1387 | } | |
1388 | ||
1389 | int | |
ca75d7de | 1390 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1391 | { |
1392 | int i; | |
1393 | ||
1588c277 | 1394 | debug3("%s entering", __func__); |
1853d1ef | 1395 | |
1396 | if (buffer_len(m) != 16) | |
1588c277 | 1397 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1398 | for (i = 0; i < 16; i++) |
1399 | session_id[i] = buffer_get_char(m); | |
1400 | ||
1401 | /* Turn on permissions for getpwnam */ | |
1402 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1403 | ||
1404 | return (0); | |
1405 | } | |
1406 | ||
1407 | int | |
ca75d7de | 1408 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1409 | { |
1410 | BIGNUM *client_n; | |
1411 | Key *key = NULL; | |
1412 | u_char *blob = NULL; | |
1413 | u_int blen = 0; | |
1414 | int allowed = 0; | |
1415 | ||
1588c277 | 1416 | debug3("%s entering", __func__); |
1853d1ef | 1417 | |
c023a130 | 1418 | auth_method = "rsa"; |
aa586f8e | 1419 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1420 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1421 | fatal("%s: BN_new", __func__); |
1853d1ef | 1422 | buffer_get_bignum2(m, client_n); |
1423 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1424 | BN_clear_free(client_n); | |
1425 | } | |
1426 | buffer_clear(m); | |
1427 | buffer_put_int(m, allowed); | |
92e15201 | 1428 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1429 | |
1430 | /* clear temporarily storage (used by generate challenge) */ | |
1431 | monitor_reset_key_state(); | |
1432 | ||
1433 | if (allowed && key != NULL) { | |
1434 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1435 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1436 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1437 | buffer_put_string(m, blob, blen); |
1438 | ||
1439 | /* Save temporarily for comparison in verify */ | |
1440 | key_blob = blob; | |
1441 | key_bloblen = blen; | |
1442 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1443 | } |
3e2f2431 | 1444 | if (key != NULL) |
1445 | key_free(key); | |
1853d1ef | 1446 | |
1447 | mm_append_debug(m); | |
1448 | ||
ca75d7de | 1449 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1450 | |
1451 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1452 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1453 | return (0); | |
1454 | } | |
1455 | ||
1456 | int | |
ca75d7de | 1457 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1458 | { |
1459 | Key *key = NULL; | |
1460 | u_char *blob; | |
1461 | u_int blen; | |
1462 | ||
1588c277 | 1463 | debug3("%s entering", __func__); |
1853d1ef | 1464 | |
1465 | if (!authctxt->valid) | |
1588c277 | 1466 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1467 | blob = buffer_get_string(m, &blen); |
1468 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1469 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1470 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1471 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1472 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1473 | fatal("%s: received bad key", __func__); |
1853d1ef | 1474 | |
1475 | if (ssh1_challenge) | |
1476 | BN_clear_free(ssh1_challenge); | |
1477 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1478 | ||
1479 | buffer_clear(m); | |
1480 | buffer_put_bignum2(m, ssh1_challenge); | |
1481 | ||
1588c277 | 1482 | debug3("%s sending reply", __func__); |
ca75d7de | 1483 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1484 | |
1485 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1486 | |
1487 | xfree(blob); | |
1488 | key_free(key); | |
1853d1ef | 1489 | return (0); |
1490 | } | |
1491 | ||
1492 | int | |
ca75d7de | 1493 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1494 | { |
1495 | Key *key = NULL; | |
1496 | u_char *blob, *response; | |
1497 | u_int blen, len; | |
1498 | int success; | |
1499 | ||
1588c277 | 1500 | debug3("%s entering", __func__); |
1853d1ef | 1501 | |
1502 | if (!authctxt->valid) | |
1588c277 | 1503 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1504 | if (ssh1_challenge == NULL) |
1588c277 | 1505 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1506 | |
1507 | blob = buffer_get_string(m, &blen); | |
1508 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1509 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1510 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1511 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1512 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1513 | fatal("%s: received bad key", __func__); |
1853d1ef | 1514 | response = buffer_get_string(m, &len); |
1515 | if (len != 16) | |
1588c277 | 1516 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1517 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1518 | ||
3e2f2431 | 1519 | xfree(blob); |
1853d1ef | 1520 | key_free(key); |
1521 | xfree(response); | |
1522 | ||
1523 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1524 | ||
1525 | /* reset state */ | |
1526 | BN_clear_free(ssh1_challenge); | |
1527 | ssh1_challenge = NULL; | |
1528 | monitor_reset_key_state(); | |
1529 | ||
1530 | buffer_clear(m); | |
1531 | buffer_put_int(m, success); | |
ca75d7de | 1532 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1533 | |
1534 | return (success); | |
1535 | } | |
1536 | ||
1537 | int | |
ca75d7de | 1538 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1539 | { |
b5a28cbc | 1540 | extern struct monitor *pmonitor; |
1853d1ef | 1541 | int res, status; |
1542 | ||
1588c277 | 1543 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1544 | |
1545 | /* The child is terminating */ | |
1546 | session_destroy_all(&mm_session_close); | |
1547 | ||
b5a28cbc | 1548 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1549 | if (errno != EINTR) |
1550 | exit(1); | |
1853d1ef | 1551 | |
1552 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1553 | ||
1554 | /* Terminate process */ | |
f6be21a0 | 1555 | exit(res); |
1853d1ef | 1556 | } |
1557 | ||
6039eeef | 1558 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1559 | /* Report that an audit event occurred */ |
1560 | int | |
1561 | mm_answer_audit_event(int socket, Buffer *m) | |
1562 | { | |
1563 | ssh_audit_event_t event; | |
1564 | ||
1565 | debug3("%s entering", __func__); | |
1566 | ||
1567 | event = buffer_get_int(m); | |
c00e4d75 | 1568 | switch(event) { |
6039eeef | 1569 | case SSH_AUTH_FAIL_PUBKEY: |
1570 | case SSH_AUTH_FAIL_HOSTBASED: | |
1571 | case SSH_AUTH_FAIL_GSSAPI: | |
1572 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1573 | case SSH_LOGIN_ROOT_DENIED: | |
1574 | case SSH_CONNECTION_CLOSE: | |
1575 | case SSH_INVALID_USER: | |
c00e4d75 | 1576 | audit_event(event); |
1577 | break; | |
1578 | default: | |
1579 | fatal("Audit event type %d not permitted", event); | |
1580 | } | |
1581 | ||
1582 | return (0); | |
1583 | } | |
1584 | ||
1585 | int | |
1586 | mm_answer_audit_command(int socket, Buffer *m) | |
1587 | { | |
1588 | u_int len; | |
1589 | char *cmd; | |
1590 | ||
1591 | debug3("%s entering", __func__); | |
1592 | cmd = buffer_get_string(m, &len); | |
1593 | /* sanity check command, if so how? */ | |
1594 | audit_run_command(cmd); | |
1595 | xfree(cmd); | |
c00e4d75 | 1596 | return (0); |
1597 | } | |
6039eeef | 1598 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1599 | |
1853d1ef | 1600 | void |
b5a28cbc | 1601 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1602 | { |
1603 | if (compat20) { | |
1604 | set_newkeys(MODE_IN); | |
1605 | set_newkeys(MODE_OUT); | |
1606 | } else { | |
1853d1ef | 1607 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1608 | packet_set_encryption_key(child_state.ssh1key, |
1609 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1610 | xfree(child_state.ssh1key); | |
1853d1ef | 1611 | } |
1612 | ||
9459414c | 1613 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1614 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1615 | xfree(child_state.keyout); | |
1616 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1617 | xfree(child_state.keyin); | |
1618 | ||
1619 | if (!compat20) { | |
1620 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1621 | xfree(child_state.ivout); | |
1622 | packet_set_iv(MODE_IN, child_state.ivin); | |
1623 | xfree(child_state.ivin); | |
1624 | } | |
1625 | ||
1626 | memcpy(&incoming_stream, &child_state.incoming, | |
1627 | sizeof(incoming_stream)); | |
1628 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1629 | sizeof(outgoing_stream)); | |
1630 | ||
1631 | /* Update with new address */ | |
0496cf34 | 1632 | if (options.compression) |
1633 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1634 | |
1635 | /* Network I/O buffers */ | |
1636 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1637 | buffer_clear(&input); | |
1638 | buffer_append(&input, child_state.input, child_state.ilen); | |
1639 | memset(child_state.input, 0, child_state.ilen); | |
1640 | xfree(child_state.input); | |
1641 | ||
1642 | buffer_clear(&output); | |
1643 | buffer_append(&output, child_state.output, child_state.olen); | |
1644 | memset(child_state.output, 0, child_state.olen); | |
1645 | xfree(child_state.output); | |
1646 | } | |
1647 | ||
1648 | static Kex * | |
1649 | mm_get_kex(Buffer *m) | |
1650 | { | |
1651 | Kex *kex; | |
1652 | void *blob; | |
1653 | u_int bloblen; | |
1654 | ||
52e3daed | 1655 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1656 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1657 | if ((session_id2 == NULL) || |
1658 | (kex->session_id_len != session_id2_len) || | |
1659 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1660 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1661 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1662 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1663 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1664 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1665 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1666 | kex->server = 1; |
1667 | kex->hostkey_type = buffer_get_int(m); | |
1668 | kex->kex_type = buffer_get_int(m); | |
1669 | blob = buffer_get_string(m, &bloblen); | |
1670 | buffer_init(&kex->my); | |
1671 | buffer_append(&kex->my, blob, bloblen); | |
1672 | xfree(blob); | |
1673 | blob = buffer_get_string(m, &bloblen); | |
1674 | buffer_init(&kex->peer); | |
1675 | buffer_append(&kex->peer, blob, bloblen); | |
1676 | xfree(blob); | |
1677 | kex->done = 1; | |
1678 | kex->flags = buffer_get_int(m); | |
1679 | kex->client_version_string = buffer_get_string(m, NULL); | |
1680 | kex->server_version_string = buffer_get_string(m, NULL); | |
1681 | kex->load_host_key=&get_hostkey_by_type; | |
1682 | kex->host_key_index=&get_hostkey_index; | |
1683 | ||
1684 | return (kex); | |
1685 | } | |
1686 | ||
1687 | /* This function requries careful sanity checking */ | |
1688 | ||
1689 | void | |
b5a28cbc | 1690 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1691 | { |
1692 | Buffer m; | |
1693 | u_char *blob, *p; | |
1694 | u_int bloblen, plen; | |
ffd7b36b | 1695 | u_int32_t seqnr, packets; |
1696 | u_int64_t blocks; | |
1853d1ef | 1697 | |
1588c277 | 1698 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1699 | |
1700 | buffer_init(&m); | |
b5a28cbc | 1701 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1702 | if (!compat20) { |
1703 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1704 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1705 | child_state.ssh1key = buffer_get_string(&m, |
1706 | &child_state.ssh1keylen); | |
1853d1ef | 1707 | child_state.ivout = buffer_get_string(&m, |
1708 | &child_state.ivoutlen); | |
1709 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1710 | goto skip; | |
1711 | } else { | |
1712 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1713 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1714 | } |
1715 | ||
1716 | blob = buffer_get_string(&m, &bloblen); | |
1717 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1718 | xfree(blob); | |
1719 | ||
1588c277 | 1720 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1721 | blob = buffer_get_string(&m, &bloblen); |
1722 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1723 | xfree(blob); | |
1724 | ||
1725 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1726 | seqnr = buffer_get_int(&m); |
1727 | blocks = buffer_get_int64(&m); | |
1728 | packets = buffer_get_int(&m); | |
1729 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1730 | seqnr = buffer_get_int(&m); | |
1731 | blocks = buffer_get_int64(&m); | |
1732 | packets = buffer_get_int(&m); | |
1733 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1734 | |
1735 | skip: | |
1736 | /* Get the key context */ | |
1737 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1738 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1739 | ||
1588c277 | 1740 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1741 | /* Get compression state */ |
1742 | p = buffer_get_string(&m, &plen); | |
1743 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1744 | fatal("%s: bad request size", __func__); |
1853d1ef | 1745 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1746 | xfree(p); | |
1747 | ||
1748 | p = buffer_get_string(&m, &plen); | |
1749 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1750 | fatal("%s: bad request size", __func__); |
1853d1ef | 1751 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1752 | xfree(p); | |
1753 | ||
1754 | /* Network I/O buffers */ | |
1588c277 | 1755 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1756 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1757 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1758 | ||
1759 | buffer_free(&m); | |
1760 | } | |
1761 | ||
1762 | ||
1763 | /* Allocation functions for zlib */ | |
1764 | void * | |
1765 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1766 | { | |
39e71188 | 1767 | size_t len = (size_t) size * ncount; |
1853d1ef | 1768 | void *address; |
1769 | ||
b85698ab | 1770 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1771 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1772 | ||
1773 | address = mm_malloc(mm, len); | |
1853d1ef | 1774 | |
1775 | return (address); | |
1776 | } | |
1777 | ||
1778 | void | |
1779 | mm_zfree(struct mm_master *mm, void *address) | |
1780 | { | |
1781 | mm_free(mm, address); | |
1782 | } | |
1783 | ||
1784 | void | |
1785 | mm_init_compression(struct mm_master *mm) | |
1786 | { | |
1787 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1788 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1789 | outgoing_stream.opaque = mm; | |
1790 | ||
1791 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1792 | incoming_stream.zfree = (free_func)mm_zfree; | |
1793 | incoming_stream.opaque = mm; | |
1794 | } | |
1795 | ||
1796 | /* XXX */ | |
1797 | ||
1798 | #define FD_CLOSEONEXEC(x) do { \ | |
1799 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1800 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1801 | } while (0) | |
1802 | ||
1803 | static void | |
1804 | monitor_socketpair(int *pair) | |
1805 | { | |
f1af2dbf | 1806 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1807 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1808 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1809 | #else |
1810 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1811 | __func__); |
f1af2dbf | 1812 | #endif |
1853d1ef | 1813 | FD_CLOSEONEXEC(pair[0]); |
1814 | FD_CLOSEONEXEC(pair[1]); | |
1815 | } | |
1816 | ||
1817 | #define MM_MEMSIZE 65536 | |
1818 | ||
1819 | struct monitor * | |
1820 | monitor_init(void) | |
1821 | { | |
1822 | struct monitor *mon; | |
1823 | int pair[2]; | |
1824 | ||
52e3daed | 1825 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1826 | |
1827 | monitor_socketpair(pair); | |
1828 | ||
1829 | mon->m_recvfd = pair[0]; | |
1830 | mon->m_sendfd = pair[1]; | |
1831 | ||
1832 | /* Used to share zlib space across processes */ | |
0496cf34 | 1833 | if (options.compression) { |
1834 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1835 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1836 | |
0496cf34 | 1837 | /* Compression needs to share state across borders */ |
1838 | mm_init_compression(mon->m_zlib); | |
1839 | } | |
1853d1ef | 1840 | |
1841 | return mon; | |
1842 | } | |
1843 | ||
1844 | void | |
1845 | monitor_reinit(struct monitor *mon) | |
1846 | { | |
1847 | int pair[2]; | |
1848 | ||
1849 | monitor_socketpair(pair); | |
1850 | ||
1851 | mon->m_recvfd = pair[0]; | |
1852 | mon->m_sendfd = pair[1]; | |
1853 | } | |
7364bd04 | 1854 | |
1855 | #ifdef GSSAPI | |
1856 | int | |
ca75d7de | 1857 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1858 | { |
ca75d7de | 1859 | gss_OID_desc goid; |
7364bd04 | 1860 | OM_uint32 major; |
1861 | u_int len; | |
1862 | ||
ca75d7de | 1863 | goid.elements = buffer_get_string(m, &len); |
1864 | goid.length = len; | |
7364bd04 | 1865 | |
ca75d7de | 1866 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1867 | |
ca75d7de | 1868 | xfree(goid.elements); |
7364bd04 | 1869 | |
1870 | buffer_clear(m); | |
1871 | buffer_put_int(m, major); | |
1872 | ||
8442cc66 | 1873 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1874 | |
1875 | /* Now we have a context, enable the step */ | |
1876 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1877 | ||
1878 | return (0); | |
1879 | } | |
1880 | ||
1881 | int | |
ca75d7de | 1882 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1883 | { |
1884 | gss_buffer_desc in; | |
1885 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1886 | OM_uint32 major, minor; |
7364bd04 | 1887 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1888 | u_int len; |
7364bd04 | 1889 | |
f99e1ca4 | 1890 | in.value = buffer_get_string(m, &len); |
1891 | in.length = len; | |
7364bd04 | 1892 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1893 | xfree(in.value); | |
1894 | ||
1895 | buffer_clear(m); | |
1896 | buffer_put_int(m, major); | |
1897 | buffer_put_string(m, out.value, out.length); | |
1898 | buffer_put_int(m, flags); | |
ca75d7de | 1899 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1900 | |
1901 | gss_release_buffer(&minor, &out); | |
1902 | ||
8442cc66 | 1903 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1904 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1905 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1906 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1907 | } |
1908 | return (0); | |
1909 | } | |
1910 | ||
0789992b | 1911 | int |
ca75d7de | 1912 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1913 | { |
1914 | gss_buffer_desc gssbuf, mic; | |
1915 | OM_uint32 ret; | |
1916 | u_int len; | |
b6453d99 | 1917 | |
0789992b | 1918 | gssbuf.value = buffer_get_string(m, &len); |
1919 | gssbuf.length = len; | |
1920 | mic.value = buffer_get_string(m, &len); | |
1921 | mic.length = len; | |
b6453d99 | 1922 | |
0789992b | 1923 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1924 | |
0789992b | 1925 | xfree(gssbuf.value); |
1926 | xfree(mic.value); | |
b6453d99 | 1927 | |
0789992b | 1928 | buffer_clear(m); |
1929 | buffer_put_int(m, ret); | |
b6453d99 | 1930 | |
ca75d7de | 1931 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1932 | |
0789992b | 1933 | if (!GSS_ERROR(ret)) |
1934 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1935 | |
0789992b | 1936 | return (0); |
1937 | } | |
1938 | ||
7364bd04 | 1939 | int |
ca75d7de | 1940 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1941 | { |
1942 | int authenticated; | |
1943 | ||
1944 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1945 | ||
1946 | buffer_clear(m); | |
1947 | buffer_put_int(m, authenticated); | |
1948 | ||
1949 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1950 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1951 | |
8442cc66 | 1952 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1953 | |
1954 | /* Monitor loop will terminate if authenticated */ | |
1955 | return (authenticated); | |
1956 | } | |
1957 | #endif /* GSSAPI */ |