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ffa517a8 | 1 | /* $OpenBSD: monitor.c,v 1.84 2006/07/26 13:57:17 stevesk Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
aa2eae64 | 29 | |
30 | #include <sys/types.h> | |
536c14e8 | 31 | #include <sys/param.h> |
5b04a8bf | 32 | #include <sys/socket.h> |
aa2eae64 | 33 | #include <sys/wait.h> |
1853d1ef | 34 | |
028094f4 | 35 | #include <errno.h> |
d3221cca | 36 | #include <fcntl.h> |
b5b88c19 | 37 | #ifdef HAVE_PATHS_H |
a75f5360 | 38 | #include <paths.h> |
b5b88c19 | 39 | #endif |
b1842393 | 40 | #include <pwd.h> |
ada68823 | 41 | #include <signal.h> |
ffa517a8 | 42 | #include <stdlib.h> |
00146caa | 43 | #include <string.h> |
1853d1ef | 44 | |
45 | #ifdef SKEY | |
46 | #include <skey.h> | |
47 | #endif | |
48 | ||
a75f5360 | 49 | #include <openssl/dh.h> |
50 | ||
1853d1ef | 51 | #include "ssh.h" |
52 | #include "auth.h" | |
53 | #include "kex.h" | |
54 | #include "dh.h" | |
a655c012 | 55 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
56 | #undef TARGET_OS_MAC | |
9b08c23f | 57 | #include "zlib.h" |
a655c012 | 58 | #define TARGET_OS_MAC 1 |
59 | #else | |
60 | #include "zlib.h" | |
61 | #endif | |
1853d1ef | 62 | #include "packet.h" |
63 | #include "auth-options.h" | |
64 | #include "sshpty.h" | |
65 | #include "channels.h" | |
66 | #include "session.h" | |
67 | #include "sshlogin.h" | |
68 | #include "canohost.h" | |
69 | #include "log.h" | |
70 | #include "servconf.h" | |
71 | #include "monitor.h" | |
72 | #include "monitor_mm.h" | |
73 | #include "monitor_wrap.h" | |
74 | #include "monitor_fdpass.h" | |
75 | #include "xmalloc.h" | |
76 | #include "misc.h" | |
77 | #include "buffer.h" | |
78 | #include "bufaux.h" | |
79 | #include "compat.h" | |
80 | #include "ssh2.h" | |
1853d1ef | 81 | |
7364bd04 | 82 | #ifdef GSSAPI |
83 | #include "ssh-gss.h" | |
84 | static Gssctxt *gsscontext = NULL; | |
85 | #endif | |
86 | ||
1853d1ef | 87 | /* Imports */ |
88 | extern ServerOptions options; | |
89 | extern u_int utmp_len; | |
90 | extern Newkeys *current_keys[]; | |
91 | extern z_stream incoming_stream; | |
92 | extern z_stream outgoing_stream; | |
93 | extern u_char session_id[]; | |
94 | extern Buffer input, output; | |
95 | extern Buffer auth_debug; | |
96 | extern int auth_debug_init; | |
be2ca0c9 | 97 | extern Buffer loginmsg; |
1853d1ef | 98 | |
99 | /* State exported from the child */ | |
100 | ||
101 | struct { | |
102 | z_stream incoming; | |
103 | z_stream outgoing; | |
104 | u_char *keyin; | |
105 | u_int keyinlen; | |
106 | u_char *keyout; | |
107 | u_int keyoutlen; | |
108 | u_char *ivin; | |
109 | u_int ivinlen; | |
110 | u_char *ivout; | |
111 | u_int ivoutlen; | |
9459414c | 112 | u_char *ssh1key; |
113 | u_int ssh1keylen; | |
1853d1ef | 114 | int ssh1cipher; |
115 | int ssh1protoflags; | |
116 | u_char *input; | |
117 | u_int ilen; | |
118 | u_char *output; | |
119 | u_int olen; | |
120 | } child_state; | |
121 | ||
b8e04133 | 122 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 123 | |
124 | int mm_answer_moduli(int, Buffer *); | |
125 | int mm_answer_sign(int, Buffer *); | |
126 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 127 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 128 | int mm_answer_authserv(int, Buffer *); |
129 | int mm_answer_authpassword(int, Buffer *); | |
130 | int mm_answer_bsdauthquery(int, Buffer *); | |
131 | int mm_answer_bsdauthrespond(int, Buffer *); | |
132 | int mm_answer_skeyquery(int, Buffer *); | |
133 | int mm_answer_skeyrespond(int, Buffer *); | |
134 | int mm_answer_keyallowed(int, Buffer *); | |
135 | int mm_answer_keyverify(int, Buffer *); | |
136 | int mm_answer_pty(int, Buffer *); | |
137 | int mm_answer_pty_cleanup(int, Buffer *); | |
138 | int mm_answer_term(int, Buffer *); | |
139 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
140 | int mm_answer_rsa_challenge(int, Buffer *); | |
141 | int mm_answer_rsa_response(int, Buffer *); | |
142 | int mm_answer_sesskey(int, Buffer *); | |
143 | int mm_answer_sessid(int, Buffer *); | |
144 | ||
ad200abb | 145 | #ifdef USE_PAM |
146 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 147 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 148 | int mm_answer_pam_init_ctx(int, Buffer *); |
149 | int mm_answer_pam_query(int, Buffer *); | |
150 | int mm_answer_pam_respond(int, Buffer *); | |
151 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 152 | #endif |
153 | ||
7364bd04 | 154 | #ifdef GSSAPI |
155 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
156 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
157 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 158 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 159 | #endif |
696f6bef | 160 | |
6039eeef | 161 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 162 | int mm_answer_audit_event(int, Buffer *); |
163 | int mm_answer_audit_command(int, Buffer *); | |
164 | #endif | |
165 | ||
1853d1ef | 166 | static Authctxt *authctxt; |
167 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
168 | ||
169 | /* local state for key verify */ | |
170 | static u_char *key_blob = NULL; | |
171 | static u_int key_bloblen = 0; | |
172 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 173 | static char *hostbased_cuser = NULL; |
174 | static char *hostbased_chost = NULL; | |
1853d1ef | 175 | static char *auth_method = "unknown"; |
a27002e5 | 176 | static u_int session_id2_len = 0; |
521d606b | 177 | static u_char *session_id2 = NULL; |
3a39206f | 178 | static pid_t monitor_child_pid; |
1853d1ef | 179 | |
180 | struct mon_table { | |
181 | enum monitor_reqtype type; | |
182 | int flags; | |
183 | int (*f)(int, Buffer *); | |
184 | }; | |
185 | ||
186 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
187 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
188 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 189 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 190 | |
191 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
192 | ||
193 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
194 | ||
195 | struct mon_table mon_dispatch_proto20[] = { | |
196 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
197 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
198 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
199 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 200 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 201 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 202 | #ifdef USE_PAM |
203 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 204 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 205 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
206 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
207 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
208 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 209 | #endif |
6039eeef | 210 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 211 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 212 | #endif |
1853d1ef | 213 | #ifdef BSD_AUTH |
214 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 215 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 216 | #endif |
217 | #ifdef SKEY | |
218 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
219 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
220 | #endif | |
221 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
222 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 223 | #ifdef GSSAPI |
224 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
225 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
226 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 227 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 228 | #endif |
1853d1ef | 229 | {0, 0, NULL} |
230 | }; | |
231 | ||
232 | struct mon_table mon_dispatch_postauth20[] = { | |
233 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
234 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
235 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
236 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
237 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 238 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 239 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
240 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
241 | #endif | |
1853d1ef | 242 | {0, 0, NULL} |
243 | }; | |
244 | ||
245 | struct mon_table mon_dispatch_proto15[] = { | |
246 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
247 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
248 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
249 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 250 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
251 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 252 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
253 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
254 | #ifdef BSD_AUTH | |
255 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 256 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 257 | #endif |
258 | #ifdef SKEY | |
259 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
260 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 261 | #endif |
262 | #ifdef USE_PAM | |
263 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 264 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 265 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
266 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
267 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
268 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 269 | #endif |
6039eeef | 270 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 271 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 272 | #endif |
273 | {0, 0, NULL} | |
274 | }; | |
275 | ||
276 | struct mon_table mon_dispatch_postauth15[] = { | |
277 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
278 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
279 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 280 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 281 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 282 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 283 | #endif |
1853d1ef | 284 | {0, 0, NULL} |
285 | }; | |
286 | ||
287 | struct mon_table *mon_dispatch; | |
288 | ||
289 | /* Specifies if a certain message is allowed at the moment */ | |
290 | ||
291 | static void | |
292 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
293 | { | |
294 | while (ent->f != NULL) { | |
295 | if (ent->type == type) { | |
296 | ent->flags &= ~MON_PERMIT; | |
297 | ent->flags |= permit ? MON_PERMIT : 0; | |
298 | return; | |
299 | } | |
300 | ent++; | |
301 | } | |
302 | } | |
303 | ||
304 | static void | |
305 | monitor_permit_authentications(int permit) | |
306 | { | |
307 | struct mon_table *ent = mon_dispatch; | |
308 | ||
309 | while (ent->f != NULL) { | |
310 | if (ent->flags & MON_AUTH) { | |
311 | ent->flags &= ~MON_PERMIT; | |
312 | ent->flags |= permit ? MON_PERMIT : 0; | |
313 | } | |
314 | ent++; | |
315 | } | |
316 | } | |
317 | ||
2362db19 | 318 | void |
319 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 320 | { |
321 | struct mon_table *ent; | |
322 | int authenticated = 0; | |
323 | ||
324 | debug3("preauth child monitor started"); | |
325 | ||
2362db19 | 326 | authctxt = _authctxt; |
327 | memset(authctxt, 0, sizeof(*authctxt)); | |
328 | ||
e05df884 | 329 | authctxt->loginmsg = &loginmsg; |
330 | ||
1853d1ef | 331 | if (compat20) { |
332 | mon_dispatch = mon_dispatch_proto20; | |
333 | ||
334 | /* Permit requests for moduli and signatures */ | |
335 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
336 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
337 | } else { | |
338 | mon_dispatch = mon_dispatch_proto15; | |
339 | ||
340 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
341 | } | |
342 | ||
1853d1ef | 343 | /* The first few requests do not require asynchronous access */ |
344 | while (!authenticated) { | |
c023a130 | 345 | auth_method = "unknown"; |
b5a28cbc | 346 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 347 | if (authenticated) { |
348 | if (!(ent->flags & MON_AUTHDECIDE)) | |
349 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 350 | __func__, ent->type); |
1853d1ef | 351 | if (authctxt->pw->pw_uid == 0 && |
352 | !auth_root_allowed(auth_method)) | |
353 | authenticated = 0; | |
5b9e2464 | 354 | #ifdef USE_PAM |
355 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 356 | if (options.use_pam && authenticated) { |
5b9e2464 | 357 | Buffer m; |
358 | ||
359 | buffer_init(&m); | |
aff51935 | 360 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 361 | MONITOR_REQ_PAM_ACCOUNT, &m); |
362 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
363 | buffer_free(&m); | |
364 | } | |
365 | #endif | |
1853d1ef | 366 | } |
367 | ||
c023a130 | 368 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 369 | auth_log(authctxt, authenticated, auth_method, |
370 | compat20 ? " ssh2" : ""); | |
371 | if (!authenticated) | |
372 | authctxt->failures++; | |
373 | } | |
374 | } | |
375 | ||
376 | if (!authctxt->valid) | |
1588c277 | 377 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 378 | if (strcmp(auth_method, "unknown") == 0) |
379 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 380 | |
381 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 382 | __func__, authctxt->user); |
1853d1ef | 383 | |
b5a28cbc | 384 | mm_get_keystate(pmonitor); |
1853d1ef | 385 | } |
386 | ||
3a39206f | 387 | static void |
388 | monitor_set_child_handler(pid_t pid) | |
389 | { | |
390 | monitor_child_pid = pid; | |
391 | } | |
392 | ||
393 | static void | |
ca75d7de | 394 | monitor_child_handler(int sig) |
3a39206f | 395 | { |
ca75d7de | 396 | kill(monitor_child_pid, sig); |
3a39206f | 397 | } |
398 | ||
1853d1ef | 399 | void |
b5a28cbc | 400 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 401 | { |
3a39206f | 402 | monitor_set_child_handler(pmonitor->m_pid); |
403 | signal(SIGHUP, &monitor_child_handler); | |
404 | signal(SIGTERM, &monitor_child_handler); | |
405 | ||
1853d1ef | 406 | if (compat20) { |
407 | mon_dispatch = mon_dispatch_postauth20; | |
408 | ||
409 | /* Permit requests for moduli and signatures */ | |
410 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
411 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
412 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 413 | } else { |
414 | mon_dispatch = mon_dispatch_postauth15; | |
415 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
416 | } | |
417 | if (!no_pty_flag) { | |
418 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
419 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
420 | } | |
421 | ||
422 | for (;;) | |
b5a28cbc | 423 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 424 | } |
425 | ||
426 | void | |
b5a28cbc | 427 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 428 | { |
0496cf34 | 429 | if (options.compression) { |
430 | /* The member allocation is not visible, so sync it */ | |
431 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
432 | } | |
1853d1ef | 433 | } |
434 | ||
435 | int | |
b5a28cbc | 436 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 437 | struct mon_table **pent) |
438 | { | |
439 | Buffer m; | |
440 | int ret; | |
441 | u_char type; | |
442 | ||
443 | buffer_init(&m); | |
444 | ||
b5a28cbc | 445 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 446 | type = buffer_get_char(&m); |
447 | ||
1588c277 | 448 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 449 | |
450 | while (ent->f != NULL) { | |
451 | if (ent->type == type) | |
452 | break; | |
453 | ent++; | |
454 | } | |
455 | ||
456 | if (ent->f != NULL) { | |
457 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 458 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 459 | type); |
b5a28cbc | 460 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 461 | buffer_free(&m); |
462 | ||
463 | /* The child may use this request only once, disable it */ | |
464 | if (ent->flags & MON_ONCE) { | |
1588c277 | 465 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 466 | type); |
467 | ent->flags &= ~MON_PERMIT; | |
468 | } | |
469 | ||
470 | if (pent != NULL) | |
471 | *pent = ent; | |
472 | ||
473 | return ret; | |
474 | } | |
475 | ||
1588c277 | 476 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 477 | |
478 | /* NOTREACHED */ | |
479 | return (-1); | |
480 | } | |
481 | ||
482 | /* allowed key state */ | |
483 | static int | |
484 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
485 | { | |
486 | /* make sure key is allowed */ | |
487 | if (key_blob == NULL || key_bloblen != bloblen || | |
488 | memcmp(key_blob, blob, key_bloblen)) | |
489 | return (0); | |
490 | return (1); | |
491 | } | |
492 | ||
493 | static void | |
494 | monitor_reset_key_state(void) | |
495 | { | |
496 | /* reset state */ | |
497 | if (key_blob != NULL) | |
498 | xfree(key_blob); | |
499 | if (hostbased_cuser != NULL) | |
500 | xfree(hostbased_cuser); | |
501 | if (hostbased_chost != NULL) | |
502 | xfree(hostbased_chost); | |
503 | key_blob = NULL; | |
504 | key_bloblen = 0; | |
505 | key_blobtype = MM_NOKEY; | |
506 | hostbased_cuser = NULL; | |
507 | hostbased_chost = NULL; | |
508 | } | |
509 | ||
510 | int | |
ca75d7de | 511 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 512 | { |
513 | DH *dh; | |
514 | int min, want, max; | |
515 | ||
516 | min = buffer_get_int(m); | |
517 | want = buffer_get_int(m); | |
518 | max = buffer_get_int(m); | |
519 | ||
520 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 521 | __func__, min, want, max); |
1853d1ef | 522 | /* We need to check here, too, in case the child got corrupted */ |
523 | if (max < min || want < min || max < want) | |
524 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 525 | __func__, min, want, max); |
1853d1ef | 526 | |
527 | buffer_clear(m); | |
528 | ||
529 | dh = choose_dh(min, want, max); | |
530 | if (dh == NULL) { | |
531 | buffer_put_char(m, 0); | |
532 | return (0); | |
533 | } else { | |
534 | /* Send first bignum */ | |
535 | buffer_put_char(m, 1); | |
536 | buffer_put_bignum2(m, dh->p); | |
537 | buffer_put_bignum2(m, dh->g); | |
538 | ||
539 | DH_free(dh); | |
540 | } | |
ca75d7de | 541 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 542 | return (0); |
543 | } | |
544 | ||
545 | int | |
ca75d7de | 546 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 547 | { |
548 | Key *key; | |
549 | u_char *p; | |
550 | u_char *signature; | |
551 | u_int siglen, datlen; | |
552 | int keyid; | |
553 | ||
1588c277 | 554 | debug3("%s", __func__); |
1853d1ef | 555 | |
556 | keyid = buffer_get_int(m); | |
557 | p = buffer_get_string(m, &datlen); | |
558 | ||
2ff8003a | 559 | /* |
b4bbf172 | 560 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 561 | * SHA256 (32 byte) hashes |
562 | */ | |
563 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 564 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 565 | |
521d606b | 566 | /* save session id, it will be passed on the first call */ |
567 | if (session_id2_len == 0) { | |
568 | session_id2_len = datlen; | |
569 | session_id2 = xmalloc(session_id2_len); | |
570 | memcpy(session_id2, p, session_id2_len); | |
571 | } | |
572 | ||
1853d1ef | 573 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 574 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 575 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 576 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 577 | |
d1ff09ba | 578 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 579 | |
580 | buffer_clear(m); | |
581 | buffer_put_string(m, signature, siglen); | |
582 | ||
583 | xfree(p); | |
584 | xfree(signature); | |
585 | ||
ca75d7de | 586 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 587 | |
588 | /* Turn on permissions for getpwnam */ | |
589 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
590 | ||
591 | return (0); | |
592 | } | |
593 | ||
594 | /* Retrieves the password entry and also checks if the user is permitted */ | |
595 | ||
596 | int | |
ca75d7de | 597 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 598 | { |
18a8f313 | 599 | char *username; |
1853d1ef | 600 | struct passwd *pwent; |
601 | int allowed = 0; | |
602 | ||
1588c277 | 603 | debug3("%s", __func__); |
1853d1ef | 604 | |
605 | if (authctxt->attempt++ != 0) | |
1588c277 | 606 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 607 | |
18a8f313 | 608 | username = buffer_get_string(m, NULL); |
1853d1ef | 609 | |
18a8f313 | 610 | pwent = getpwnamallow(username); |
1853d1ef | 611 | |
18a8f313 | 612 | authctxt->user = xstrdup(username); |
613 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
614 | xfree(username); | |
1853d1ef | 615 | |
616 | buffer_clear(m); | |
617 | ||
618 | if (pwent == NULL) { | |
619 | buffer_put_char(m, 0); | |
b2a5802b | 620 | authctxt->pw = fakepw(); |
1853d1ef | 621 | goto out; |
622 | } | |
623 | ||
624 | allowed = 1; | |
625 | authctxt->pw = pwent; | |
626 | authctxt->valid = 1; | |
627 | ||
628 | buffer_put_char(m, 1); | |
629 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
630 | buffer_put_cstring(m, pwent->pw_name); | |
631 | buffer_put_cstring(m, "*"); | |
632 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 633 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 634 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 635 | #endif |
1853d1ef | 636 | buffer_put_cstring(m, pwent->pw_dir); |
637 | buffer_put_cstring(m, pwent->pw_shell); | |
638 | ||
639 | out: | |
1588c277 | 640 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 641 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 642 | |
643 | /* For SSHv1 allow authentication now */ | |
644 | if (!compat20) | |
645 | monitor_permit_authentications(1); | |
94a73cdc | 646 | else { |
1853d1ef | 647 | /* Allow service/style information on the auth context */ |
648 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 649 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
650 | } | |
1853d1ef | 651 | |
efe44db6 | 652 | #ifdef USE_PAM |
7fceb20d | 653 | if (options.use_pam) |
654 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 655 | #endif |
6039eeef | 656 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 657 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 658 | #endif |
1853d1ef | 659 | |
660 | return (0); | |
661 | } | |
662 | ||
ca75d7de | 663 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 664 | { |
665 | char *banner; | |
666 | ||
667 | buffer_clear(m); | |
668 | banner = auth2_read_banner(); | |
669 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 670 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 671 | |
672 | if (banner != NULL) | |
30e37ee6 | 673 | xfree(banner); |
94a73cdc | 674 | |
675 | return (0); | |
676 | } | |
677 | ||
1853d1ef | 678 | int |
ca75d7de | 679 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 680 | { |
681 | monitor_permit_authentications(1); | |
682 | ||
683 | authctxt->service = buffer_get_string(m, NULL); | |
684 | authctxt->style = buffer_get_string(m, NULL); | |
685 | debug3("%s: service=%s, style=%s", | |
1588c277 | 686 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 687 | |
688 | if (strlen(authctxt->style) == 0) { | |
689 | xfree(authctxt->style); | |
690 | authctxt->style = NULL; | |
691 | } | |
692 | ||
693 | return (0); | |
694 | } | |
695 | ||
696 | int | |
ca75d7de | 697 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 698 | { |
699 | static int call_count; | |
700 | char *passwd; | |
d341742a | 701 | int authenticated; |
702 | u_int plen; | |
1853d1ef | 703 | |
704 | passwd = buffer_get_string(m, &plen); | |
705 | /* Only authenticate if the context is valid */ | |
aa586f8e | 706 | authenticated = options.password_authentication && |
96d0bf74 | 707 | auth_password(authctxt, passwd); |
1853d1ef | 708 | memset(passwd, 0, strlen(passwd)); |
709 | xfree(passwd); | |
710 | ||
711 | buffer_clear(m); | |
712 | buffer_put_int(m, authenticated); | |
713 | ||
1588c277 | 714 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 715 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 716 | |
717 | call_count++; | |
718 | if (plen == 0 && call_count == 1) | |
719 | auth_method = "none"; | |
720 | else | |
721 | auth_method = "password"; | |
722 | ||
723 | /* Causes monitor loop to terminate if authenticated */ | |
724 | return (authenticated); | |
725 | } | |
726 | ||
727 | #ifdef BSD_AUTH | |
728 | int | |
ca75d7de | 729 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 730 | { |
731 | char *name, *infotxt; | |
732 | u_int numprompts; | |
733 | u_int *echo_on; | |
734 | char **prompts; | |
6d6c25e3 | 735 | u_int success; |
1853d1ef | 736 | |
6d6c25e3 | 737 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
738 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 739 | |
740 | buffer_clear(m); | |
6d6c25e3 | 741 | buffer_put_int(m, success); |
742 | if (success) | |
1853d1ef | 743 | buffer_put_cstring(m, prompts[0]); |
744 | ||
6d6c25e3 | 745 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 746 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 747 | |
6d6c25e3 | 748 | if (success) { |
1853d1ef | 749 | xfree(name); |
750 | xfree(infotxt); | |
751 | xfree(prompts); | |
752 | xfree(echo_on); | |
753 | } | |
754 | ||
755 | return (0); | |
756 | } | |
757 | ||
758 | int | |
ca75d7de | 759 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 760 | { |
761 | char *response; | |
762 | int authok; | |
763 | ||
764 | if (authctxt->as == 0) | |
1588c277 | 765 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 766 | |
767 | response = buffer_get_string(m, NULL); | |
aa586f8e | 768 | authok = options.challenge_response_authentication && |
769 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 770 | authctxt->as = NULL; |
1588c277 | 771 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 772 | xfree(response); |
773 | ||
774 | buffer_clear(m); | |
775 | buffer_put_int(m, authok); | |
776 | ||
1588c277 | 777 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 778 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 779 | |
780 | auth_method = "bsdauth"; | |
781 | ||
782 | return (authok != 0); | |
783 | } | |
784 | #endif | |
785 | ||
786 | #ifdef SKEY | |
787 | int | |
ca75d7de | 788 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 789 | { |
790 | struct skey skey; | |
791 | char challenge[1024]; | |
6d6c25e3 | 792 | u_int success; |
1853d1ef | 793 | |
f2b7b5c8 | 794 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
795 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 796 | |
797 | buffer_clear(m); | |
6d6c25e3 | 798 | buffer_put_int(m, success); |
799 | if (success) | |
1853d1ef | 800 | buffer_put_cstring(m, challenge); |
801 | ||
6d6c25e3 | 802 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 803 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 804 | |
805 | return (0); | |
806 | } | |
807 | ||
808 | int | |
ca75d7de | 809 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 810 | { |
811 | char *response; | |
812 | int authok; | |
813 | ||
814 | response = buffer_get_string(m, NULL); | |
815 | ||
aa586f8e | 816 | authok = (options.challenge_response_authentication && |
817 | authctxt->valid && | |
1853d1ef | 818 | skey_haskey(authctxt->pw->pw_name) == 0 && |
819 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
820 | ||
821 | xfree(response); | |
822 | ||
823 | buffer_clear(m); | |
824 | buffer_put_int(m, authok); | |
825 | ||
1588c277 | 826 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 827 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 828 | |
829 | auth_method = "skey"; | |
830 | ||
831 | return (authok != 0); | |
832 | } | |
833 | #endif | |
834 | ||
ad200abb | 835 | #ifdef USE_PAM |
836 | int | |
8b3ec5fd | 837 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 838 | { |
7fceb20d | 839 | if (!options.use_pam) |
840 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
841 | ||
529d73ab | 842 | start_pam(authctxt); |
ad200abb | 843 | |
5b9e2464 | 844 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
845 | ||
ad200abb | 846 | return (0); |
847 | } | |
05114c74 | 848 | |
5b9e2464 | 849 | int |
8b3ec5fd | 850 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 851 | { |
852 | u_int ret; | |
b6453d99 | 853 | |
5b9e2464 | 854 | if (!options.use_pam) |
855 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
856 | ||
857 | ret = do_pam_account(); | |
858 | ||
859 | buffer_put_int(m, ret); | |
cfb60d3a | 860 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 861 | |
8b3ec5fd | 862 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 863 | |
864 | return (ret); | |
865 | } | |
866 | ||
05114c74 | 867 | static void *sshpam_ctxt, *sshpam_authok; |
868 | extern KbdintDevice sshpam_device; | |
869 | ||
870 | int | |
8b3ec5fd | 871 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 872 | { |
873 | ||
874 | debug3("%s", __func__); | |
875 | authctxt->user = buffer_get_string(m, NULL); | |
876 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
877 | sshpam_authok = NULL; | |
878 | buffer_clear(m); | |
879 | if (sshpam_ctxt != NULL) { | |
880 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
881 | buffer_put_int(m, 1); | |
882 | } else { | |
883 | buffer_put_int(m, 0); | |
884 | } | |
8b3ec5fd | 885 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 886 | return (0); |
887 | } | |
888 | ||
889 | int | |
8b3ec5fd | 890 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 891 | { |
892 | char *name, *info, **prompts; | |
a1a073cc | 893 | u_int i, num, *echo_on; |
894 | int ret; | |
05114c74 | 895 | |
896 | debug3("%s", __func__); | |
897 | sshpam_authok = NULL; | |
898 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
899 | if (ret == 0 && num == 0) | |
900 | sshpam_authok = sshpam_ctxt; | |
901 | if (num > 1 || name == NULL || info == NULL) | |
902 | ret = -1; | |
903 | buffer_clear(m); | |
904 | buffer_put_int(m, ret); | |
905 | buffer_put_cstring(m, name); | |
906 | xfree(name); | |
907 | buffer_put_cstring(m, info); | |
908 | xfree(info); | |
909 | buffer_put_int(m, num); | |
910 | for (i = 0; i < num; ++i) { | |
911 | buffer_put_cstring(m, prompts[i]); | |
912 | xfree(prompts[i]); | |
913 | buffer_put_int(m, echo_on[i]); | |
914 | } | |
915 | if (prompts != NULL) | |
916 | xfree(prompts); | |
917 | if (echo_on != NULL) | |
918 | xfree(echo_on); | |
2ae7f715 | 919 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 920 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 921 | return (0); |
922 | } | |
923 | ||
924 | int | |
8b3ec5fd | 925 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 926 | { |
927 | char **resp; | |
a1a073cc | 928 | u_int i, num; |
929 | int ret; | |
05114c74 | 930 | |
931 | debug3("%s", __func__); | |
932 | sshpam_authok = NULL; | |
933 | num = buffer_get_int(m); | |
934 | if (num > 0) { | |
01d35895 | 935 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 936 | for (i = 0; i < num; ++i) |
937 | resp[i] = buffer_get_string(m, NULL); | |
938 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
939 | for (i = 0; i < num; ++i) | |
940 | xfree(resp[i]); | |
941 | xfree(resp); | |
942 | } else { | |
943 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
944 | } | |
945 | buffer_clear(m); | |
946 | buffer_put_int(m, ret); | |
8b3ec5fd | 947 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 948 | auth_method = "keyboard-interactive/pam"; |
949 | if (ret == 0) | |
950 | sshpam_authok = sshpam_ctxt; | |
951 | return (0); | |
952 | } | |
953 | ||
954 | int | |
8b3ec5fd | 955 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 956 | { |
957 | ||
958 | debug3("%s", __func__); | |
959 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
960 | buffer_clear(m); | |
8b3ec5fd | 961 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 962 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 963 | return (sshpam_authok == sshpam_ctxt); |
964 | } | |
ad200abb | 965 | #endif |
966 | ||
1853d1ef | 967 | static void |
968 | mm_append_debug(Buffer *m) | |
969 | { | |
970 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 971 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 972 | buffer_append(m, buffer_ptr(&auth_debug), |
973 | buffer_len(&auth_debug)); | |
974 | buffer_clear(&auth_debug); | |
975 | } | |
976 | } | |
977 | ||
978 | int | |
ca75d7de | 979 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 980 | { |
981 | Key *key; | |
661e45a0 | 982 | char *cuser, *chost; |
983 | u_char *blob; | |
1853d1ef | 984 | u_int bloblen; |
985 | enum mm_keytype type = 0; | |
986 | int allowed = 0; | |
987 | ||
1588c277 | 988 | debug3("%s entering", __func__); |
1853d1ef | 989 | |
990 | type = buffer_get_int(m); | |
991 | cuser = buffer_get_string(m, NULL); | |
992 | chost = buffer_get_string(m, NULL); | |
993 | blob = buffer_get_string(m, &bloblen); | |
994 | ||
995 | key = key_from_blob(blob, bloblen); | |
996 | ||
997 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
998 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 999 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 1000 | |
1588c277 | 1001 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1002 | |
fdaef11e | 1003 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1004 | switch (type) { |
1853d1ef | 1005 | case MM_USERKEY: |
aa586f8e | 1006 | allowed = options.pubkey_authentication && |
1007 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1008 | auth_method = "publickey"; |
1853d1ef | 1009 | break; |
1010 | case MM_HOSTKEY: | |
aa586f8e | 1011 | allowed = options.hostbased_authentication && |
1012 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1013 | cuser, chost, key); |
c023a130 | 1014 | auth_method = "hostbased"; |
1853d1ef | 1015 | break; |
1016 | case MM_RSAHOSTKEY: | |
1017 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1018 | allowed = options.rhosts_rsa_authentication && |
1019 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1020 | cuser, chost, key); |
c023a130 | 1021 | auth_method = "rsa"; |
1853d1ef | 1022 | break; |
1023 | default: | |
1588c277 | 1024 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1025 | break; |
1026 | } | |
1853d1ef | 1027 | } |
3e2f2431 | 1028 | if (key != NULL) |
1029 | key_free(key); | |
1853d1ef | 1030 | |
1031 | /* clear temporarily storage (used by verify) */ | |
1032 | monitor_reset_key_state(); | |
1033 | ||
1034 | if (allowed) { | |
1035 | /* Save temporarily for comparison in verify */ | |
1036 | key_blob = blob; | |
1037 | key_bloblen = bloblen; | |
1038 | key_blobtype = type; | |
1039 | hostbased_cuser = cuser; | |
1040 | hostbased_chost = chost; | |
98d40a74 | 1041 | } else { |
c023a130 | 1042 | /* Log failed attempt */ |
1043 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1044 | xfree(blob); |
1045 | xfree(cuser); | |
1046 | xfree(chost); | |
1853d1ef | 1047 | } |
1048 | ||
1049 | debug3("%s: key %p is %s", | |
1588c277 | 1050 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1051 | |
1052 | buffer_clear(m); | |
1053 | buffer_put_int(m, allowed); | |
92e15201 | 1054 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1055 | |
1056 | mm_append_debug(m); | |
1057 | ||
ca75d7de | 1058 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1059 | |
1060 | if (type == MM_RSAHOSTKEY) | |
1061 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1062 | ||
1063 | return (0); | |
1064 | } | |
1065 | ||
1066 | static int | |
1067 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1068 | { | |
1069 | Buffer b; | |
661e45a0 | 1070 | char *p; |
1853d1ef | 1071 | u_int len; |
1072 | int fail = 0; | |
1853d1ef | 1073 | |
1074 | buffer_init(&b); | |
1075 | buffer_append(&b, data, datalen); | |
1076 | ||
1077 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1078 | p = buffer_ptr(&b); |
1079 | len = buffer_len(&b); | |
1080 | if ((session_id2 == NULL) || | |
1081 | (len < session_id2_len) || | |
1082 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1083 | fail++; | |
1853d1ef | 1084 | buffer_consume(&b, session_id2_len); |
1085 | } else { | |
521d606b | 1086 | p = buffer_get_string(&b, &len); |
1087 | if ((session_id2 == NULL) || | |
1088 | (len != session_id2_len) || | |
1089 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1090 | fail++; |
521d606b | 1091 | xfree(p); |
1853d1ef | 1092 | } |
1093 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1094 | fail++; | |
1095 | p = buffer_get_string(&b, NULL); | |
1096 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1097 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1098 | authctxt->user, p); |
1099 | fail++; | |
1100 | } | |
1101 | xfree(p); | |
1102 | buffer_skip_string(&b); | |
1103 | if (datafellows & SSH_BUG_PKAUTH) { | |
1104 | if (!buffer_get_char(&b)) | |
1105 | fail++; | |
1106 | } else { | |
1107 | p = buffer_get_string(&b, NULL); | |
1108 | if (strcmp("publickey", p) != 0) | |
1109 | fail++; | |
1110 | xfree(p); | |
1111 | if (!buffer_get_char(&b)) | |
1112 | fail++; | |
1113 | buffer_skip_string(&b); | |
1114 | } | |
1115 | buffer_skip_string(&b); | |
1116 | if (buffer_len(&b) != 0) | |
1117 | fail++; | |
1118 | buffer_free(&b); | |
1119 | return (fail == 0); | |
1120 | } | |
1121 | ||
1122 | static int | |
661e45a0 | 1123 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1124 | char *chost) | |
1853d1ef | 1125 | { |
1126 | Buffer b; | |
661e45a0 | 1127 | char *p; |
1853d1ef | 1128 | u_int len; |
1129 | int fail = 0; | |
1853d1ef | 1130 | |
1131 | buffer_init(&b); | |
1132 | buffer_append(&b, data, datalen); | |
1133 | ||
521d606b | 1134 | p = buffer_get_string(&b, &len); |
1135 | if ((session_id2 == NULL) || | |
1136 | (len != session_id2_len) || | |
1137 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1138 | fail++; |
521d606b | 1139 | xfree(p); |
1140 | ||
1853d1ef | 1141 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1142 | fail++; | |
1143 | p = buffer_get_string(&b, NULL); | |
1144 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1145 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1146 | authctxt->user, p); |
1147 | fail++; | |
1148 | } | |
1149 | xfree(p); | |
1150 | buffer_skip_string(&b); /* service */ | |
1151 | p = buffer_get_string(&b, NULL); | |
1152 | if (strcmp(p, "hostbased") != 0) | |
1153 | fail++; | |
1154 | xfree(p); | |
1155 | buffer_skip_string(&b); /* pkalg */ | |
1156 | buffer_skip_string(&b); /* pkblob */ | |
1157 | ||
1158 | /* verify client host, strip trailing dot if necessary */ | |
1159 | p = buffer_get_string(&b, NULL); | |
1160 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1161 | p[len - 1] = '\0'; | |
1162 | if (strcmp(p, chost) != 0) | |
1163 | fail++; | |
1164 | xfree(p); | |
1165 | ||
1166 | /* verify client user */ | |
1167 | p = buffer_get_string(&b, NULL); | |
1168 | if (strcmp(p, cuser) != 0) | |
1169 | fail++; | |
1170 | xfree(p); | |
1171 | ||
1172 | if (buffer_len(&b) != 0) | |
1173 | fail++; | |
1174 | buffer_free(&b); | |
1175 | return (fail == 0); | |
1176 | } | |
1177 | ||
1178 | int | |
ca75d7de | 1179 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1180 | { |
1181 | Key *key; | |
1182 | u_char *signature, *data, *blob; | |
1183 | u_int signaturelen, datalen, bloblen; | |
1184 | int verified = 0; | |
1185 | int valid_data = 0; | |
1186 | ||
1187 | blob = buffer_get_string(m, &bloblen); | |
1188 | signature = buffer_get_string(m, &signaturelen); | |
1189 | data = buffer_get_string(m, &datalen); | |
1190 | ||
1191 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1192 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1193 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1194 | |
1195 | key = key_from_blob(blob, bloblen); | |
1196 | if (key == NULL) | |
1588c277 | 1197 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1198 | |
1199 | switch (key_blobtype) { | |
1200 | case MM_USERKEY: | |
1201 | valid_data = monitor_valid_userblob(data, datalen); | |
1202 | break; | |
1203 | case MM_HOSTKEY: | |
1204 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1205 | hostbased_cuser, hostbased_chost); | |
1206 | break; | |
1207 | default: | |
1208 | valid_data = 0; | |
1209 | break; | |
1210 | } | |
1211 | if (!valid_data) | |
1588c277 | 1212 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1213 | |
1214 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1215 | debug3("%s: key %p signature %s", | |
1588c277 | 1216 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1217 | |
1218 | key_free(key); | |
1219 | xfree(blob); | |
1220 | xfree(signature); | |
1221 | xfree(data); | |
1222 | ||
d17ef027 | 1223 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1224 | ||
1853d1ef | 1225 | monitor_reset_key_state(); |
1226 | ||
1227 | buffer_clear(m); | |
1228 | buffer_put_int(m, verified); | |
ca75d7de | 1229 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1230 | |
1853d1ef | 1231 | return (verified); |
1232 | } | |
1233 | ||
1234 | static void | |
1235 | mm_record_login(Session *s, struct passwd *pw) | |
1236 | { | |
1237 | socklen_t fromlen; | |
1238 | struct sockaddr_storage from; | |
1239 | ||
1240 | /* | |
1241 | * Get IP address of client. If the connection is not a socket, let | |
1242 | * the address be 0.0.0.0. | |
1243 | */ | |
1244 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1245 | fromlen = sizeof(from); |
1853d1ef | 1246 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1247 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1248 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1249 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1250 | cleanup_exit(255); |
1853d1ef | 1251 | } |
1252 | } | |
1253 | /* Record that there was a login on that tty from the remote host. */ | |
1254 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1255 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1256 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1257 | } |
1258 | ||
1259 | static void | |
1260 | mm_session_close(Session *s) | |
1261 | { | |
b9ed513a | 1262 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1263 | if (s->ttyfd != -1) { |
1588c277 | 1264 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1265 | session_pty_cleanup2(s); |
1266 | } | |
1267 | s->used = 0; | |
1268 | } | |
1269 | ||
1270 | int | |
ca75d7de | 1271 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1272 | { |
b5a28cbc | 1273 | extern struct monitor *pmonitor; |
1853d1ef | 1274 | Session *s; |
1275 | int res, fd0; | |
1276 | ||
1588c277 | 1277 | debug3("%s entering", __func__); |
1853d1ef | 1278 | |
1279 | buffer_clear(m); | |
1280 | s = session_new(); | |
1281 | if (s == NULL) | |
1282 | goto error; | |
1283 | s->authctxt = authctxt; | |
1284 | s->pw = authctxt->pw; | |
b5a28cbc | 1285 | s->pid = pmonitor->m_pid; |
1853d1ef | 1286 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1287 | if (res == 0) | |
1288 | goto error; | |
1853d1ef | 1289 | pty_setowner(authctxt->pw, s->tty); |
1290 | ||
1291 | buffer_put_int(m, 1); | |
1292 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1293 | |
1294 | /* We need to trick ttyslot */ | |
1295 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1296 | fatal("%s: dup2", __func__); |
1853d1ef | 1297 | |
1298 | mm_record_login(s, authctxt->pw); | |
1299 | ||
1300 | /* Now we can close the file descriptor again */ | |
1301 | close(0); | |
1302 | ||
be2ca0c9 | 1303 | /* send messages generated by record_login */ |
1304 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1305 | buffer_clear(&loginmsg); | |
1306 | ||
1307 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1308 | ||
1309 | mm_send_fd(sock, s->ptyfd); | |
1310 | mm_send_fd(sock, s->ttyfd); | |
1311 | ||
1853d1ef | 1312 | /* make sure nothing uses fd 0 */ |
1313 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1314 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1315 | if (fd0 != 0) |
1588c277 | 1316 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1317 | |
1318 | /* slave is not needed */ | |
1319 | close(s->ttyfd); | |
1320 | s->ttyfd = s->ptyfd; | |
1321 | /* no need to dup() because nobody closes ptyfd */ | |
1322 | s->ptymaster = s->ptyfd; | |
1323 | ||
1588c277 | 1324 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1325 | |
1326 | return (0); | |
1327 | ||
1328 | error: | |
1329 | if (s != NULL) | |
1330 | mm_session_close(s); | |
1331 | buffer_put_int(m, 0); | |
ca75d7de | 1332 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1333 | return (0); |
1334 | } | |
1335 | ||
1336 | int | |
ca75d7de | 1337 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1338 | { |
1339 | Session *s; | |
1340 | char *tty; | |
1341 | ||
1588c277 | 1342 | debug3("%s entering", __func__); |
1853d1ef | 1343 | |
1344 | tty = buffer_get_string(m, NULL); | |
1345 | if ((s = session_by_tty(tty)) != NULL) | |
1346 | mm_session_close(s); | |
1347 | buffer_clear(m); | |
1348 | xfree(tty); | |
1349 | return (0); | |
1350 | } | |
1351 | ||
1352 | int | |
ca75d7de | 1353 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1354 | { |
1355 | BIGNUM *p; | |
1356 | int rsafail; | |
1357 | ||
1358 | /* Turn off permissions */ | |
75cccc2c | 1359 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1360 | |
1361 | if ((p = BN_new()) == NULL) | |
1588c277 | 1362 | fatal("%s: BN_new", __func__); |
1853d1ef | 1363 | |
1364 | buffer_get_bignum2(m, p); | |
1365 | ||
1366 | rsafail = ssh1_session_key(p); | |
1367 | ||
1368 | buffer_clear(m); | |
1369 | buffer_put_int(m, rsafail); | |
1370 | buffer_put_bignum2(m, p); | |
1371 | ||
1372 | BN_clear_free(p); | |
1373 | ||
ca75d7de | 1374 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1375 | |
1376 | /* Turn on permissions for sessid passing */ | |
1377 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1378 | ||
1379 | return (0); | |
1380 | } | |
1381 | ||
1382 | int | |
ca75d7de | 1383 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1384 | { |
1385 | int i; | |
1386 | ||
1588c277 | 1387 | debug3("%s entering", __func__); |
1853d1ef | 1388 | |
1389 | if (buffer_len(m) != 16) | |
1588c277 | 1390 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1391 | for (i = 0; i < 16; i++) |
1392 | session_id[i] = buffer_get_char(m); | |
1393 | ||
1394 | /* Turn on permissions for getpwnam */ | |
1395 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1396 | ||
1397 | return (0); | |
1398 | } | |
1399 | ||
1400 | int | |
ca75d7de | 1401 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1402 | { |
1403 | BIGNUM *client_n; | |
1404 | Key *key = NULL; | |
1405 | u_char *blob = NULL; | |
1406 | u_int blen = 0; | |
1407 | int allowed = 0; | |
1408 | ||
1588c277 | 1409 | debug3("%s entering", __func__); |
1853d1ef | 1410 | |
c023a130 | 1411 | auth_method = "rsa"; |
aa586f8e | 1412 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1413 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1414 | fatal("%s: BN_new", __func__); |
1853d1ef | 1415 | buffer_get_bignum2(m, client_n); |
1416 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1417 | BN_clear_free(client_n); | |
1418 | } | |
1419 | buffer_clear(m); | |
1420 | buffer_put_int(m, allowed); | |
92e15201 | 1421 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1422 | |
1423 | /* clear temporarily storage (used by generate challenge) */ | |
1424 | monitor_reset_key_state(); | |
1425 | ||
1426 | if (allowed && key != NULL) { | |
1427 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1428 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1429 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1430 | buffer_put_string(m, blob, blen); |
1431 | ||
1432 | /* Save temporarily for comparison in verify */ | |
1433 | key_blob = blob; | |
1434 | key_bloblen = blen; | |
1435 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1436 | } |
3e2f2431 | 1437 | if (key != NULL) |
1438 | key_free(key); | |
1853d1ef | 1439 | |
1440 | mm_append_debug(m); | |
1441 | ||
ca75d7de | 1442 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1443 | |
1444 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1445 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1446 | return (0); | |
1447 | } | |
1448 | ||
1449 | int | |
ca75d7de | 1450 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1451 | { |
1452 | Key *key = NULL; | |
1453 | u_char *blob; | |
1454 | u_int blen; | |
1455 | ||
1588c277 | 1456 | debug3("%s entering", __func__); |
1853d1ef | 1457 | |
1458 | if (!authctxt->valid) | |
1588c277 | 1459 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1460 | blob = buffer_get_string(m, &blen); |
1461 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1462 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1463 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1464 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1465 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1466 | fatal("%s: received bad key", __func__); |
1853d1ef | 1467 | |
1468 | if (ssh1_challenge) | |
1469 | BN_clear_free(ssh1_challenge); | |
1470 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1471 | ||
1472 | buffer_clear(m); | |
1473 | buffer_put_bignum2(m, ssh1_challenge); | |
1474 | ||
1588c277 | 1475 | debug3("%s sending reply", __func__); |
ca75d7de | 1476 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1477 | |
1478 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1479 | |
1480 | xfree(blob); | |
1481 | key_free(key); | |
1853d1ef | 1482 | return (0); |
1483 | } | |
1484 | ||
1485 | int | |
ca75d7de | 1486 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1487 | { |
1488 | Key *key = NULL; | |
1489 | u_char *blob, *response; | |
1490 | u_int blen, len; | |
1491 | int success; | |
1492 | ||
1588c277 | 1493 | debug3("%s entering", __func__); |
1853d1ef | 1494 | |
1495 | if (!authctxt->valid) | |
1588c277 | 1496 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1497 | if (ssh1_challenge == NULL) |
1588c277 | 1498 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1499 | |
1500 | blob = buffer_get_string(m, &blen); | |
1501 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1502 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1503 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1504 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1505 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1506 | fatal("%s: received bad key", __func__); |
1853d1ef | 1507 | response = buffer_get_string(m, &len); |
1508 | if (len != 16) | |
1588c277 | 1509 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1510 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1511 | ||
3e2f2431 | 1512 | xfree(blob); |
1853d1ef | 1513 | key_free(key); |
1514 | xfree(response); | |
1515 | ||
1516 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1517 | ||
1518 | /* reset state */ | |
1519 | BN_clear_free(ssh1_challenge); | |
1520 | ssh1_challenge = NULL; | |
1521 | monitor_reset_key_state(); | |
1522 | ||
1523 | buffer_clear(m); | |
1524 | buffer_put_int(m, success); | |
ca75d7de | 1525 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1526 | |
1527 | return (success); | |
1528 | } | |
1529 | ||
1530 | int | |
ca75d7de | 1531 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1532 | { |
b5a28cbc | 1533 | extern struct monitor *pmonitor; |
1853d1ef | 1534 | int res, status; |
1535 | ||
1588c277 | 1536 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1537 | |
1538 | /* The child is terminating */ | |
1539 | session_destroy_all(&mm_session_close); | |
1540 | ||
b5a28cbc | 1541 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1542 | if (errno != EINTR) |
1543 | exit(1); | |
1853d1ef | 1544 | |
1545 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1546 | ||
1547 | /* Terminate process */ | |
f6be21a0 | 1548 | exit(res); |
1853d1ef | 1549 | } |
1550 | ||
6039eeef | 1551 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1552 | /* Report that an audit event occurred */ |
1553 | int | |
1554 | mm_answer_audit_event(int socket, Buffer *m) | |
1555 | { | |
1556 | ssh_audit_event_t event; | |
1557 | ||
1558 | debug3("%s entering", __func__); | |
1559 | ||
1560 | event = buffer_get_int(m); | |
c00e4d75 | 1561 | switch(event) { |
6039eeef | 1562 | case SSH_AUTH_FAIL_PUBKEY: |
1563 | case SSH_AUTH_FAIL_HOSTBASED: | |
1564 | case SSH_AUTH_FAIL_GSSAPI: | |
1565 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1566 | case SSH_LOGIN_ROOT_DENIED: | |
1567 | case SSH_CONNECTION_CLOSE: | |
1568 | case SSH_INVALID_USER: | |
c00e4d75 | 1569 | audit_event(event); |
1570 | break; | |
1571 | default: | |
1572 | fatal("Audit event type %d not permitted", event); | |
1573 | } | |
1574 | ||
1575 | return (0); | |
1576 | } | |
1577 | ||
1578 | int | |
1579 | mm_answer_audit_command(int socket, Buffer *m) | |
1580 | { | |
1581 | u_int len; | |
1582 | char *cmd; | |
1583 | ||
1584 | debug3("%s entering", __func__); | |
1585 | cmd = buffer_get_string(m, &len); | |
1586 | /* sanity check command, if so how? */ | |
1587 | audit_run_command(cmd); | |
1588 | xfree(cmd); | |
c00e4d75 | 1589 | return (0); |
1590 | } | |
6039eeef | 1591 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1592 | |
1853d1ef | 1593 | void |
b5a28cbc | 1594 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1595 | { |
1596 | if (compat20) { | |
1597 | set_newkeys(MODE_IN); | |
1598 | set_newkeys(MODE_OUT); | |
1599 | } else { | |
1853d1ef | 1600 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1601 | packet_set_encryption_key(child_state.ssh1key, |
1602 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1603 | xfree(child_state.ssh1key); | |
1853d1ef | 1604 | } |
1605 | ||
9459414c | 1606 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1607 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1608 | xfree(child_state.keyout); | |
1609 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1610 | xfree(child_state.keyin); | |
1611 | ||
1612 | if (!compat20) { | |
1613 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1614 | xfree(child_state.ivout); | |
1615 | packet_set_iv(MODE_IN, child_state.ivin); | |
1616 | xfree(child_state.ivin); | |
1617 | } | |
1618 | ||
1619 | memcpy(&incoming_stream, &child_state.incoming, | |
1620 | sizeof(incoming_stream)); | |
1621 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1622 | sizeof(outgoing_stream)); | |
1623 | ||
1624 | /* Update with new address */ | |
0496cf34 | 1625 | if (options.compression) |
1626 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1627 | |
1628 | /* Network I/O buffers */ | |
1629 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1630 | buffer_clear(&input); | |
1631 | buffer_append(&input, child_state.input, child_state.ilen); | |
1632 | memset(child_state.input, 0, child_state.ilen); | |
1633 | xfree(child_state.input); | |
1634 | ||
1635 | buffer_clear(&output); | |
1636 | buffer_append(&output, child_state.output, child_state.olen); | |
1637 | memset(child_state.output, 0, child_state.olen); | |
1638 | xfree(child_state.output); | |
1639 | } | |
1640 | ||
1641 | static Kex * | |
1642 | mm_get_kex(Buffer *m) | |
1643 | { | |
1644 | Kex *kex; | |
1645 | void *blob; | |
1646 | u_int bloblen; | |
1647 | ||
52e3daed | 1648 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1649 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1650 | if ((session_id2 == NULL) || |
1651 | (kex->session_id_len != session_id2_len) || | |
1652 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1653 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1654 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1655 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1656 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1657 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1658 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1659 | kex->server = 1; |
1660 | kex->hostkey_type = buffer_get_int(m); | |
1661 | kex->kex_type = buffer_get_int(m); | |
1662 | blob = buffer_get_string(m, &bloblen); | |
1663 | buffer_init(&kex->my); | |
1664 | buffer_append(&kex->my, blob, bloblen); | |
1665 | xfree(blob); | |
1666 | blob = buffer_get_string(m, &bloblen); | |
1667 | buffer_init(&kex->peer); | |
1668 | buffer_append(&kex->peer, blob, bloblen); | |
1669 | xfree(blob); | |
1670 | kex->done = 1; | |
1671 | kex->flags = buffer_get_int(m); | |
1672 | kex->client_version_string = buffer_get_string(m, NULL); | |
1673 | kex->server_version_string = buffer_get_string(m, NULL); | |
1674 | kex->load_host_key=&get_hostkey_by_type; | |
1675 | kex->host_key_index=&get_hostkey_index; | |
1676 | ||
1677 | return (kex); | |
1678 | } | |
1679 | ||
1680 | /* This function requries careful sanity checking */ | |
1681 | ||
1682 | void | |
b5a28cbc | 1683 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1684 | { |
1685 | Buffer m; | |
1686 | u_char *blob, *p; | |
1687 | u_int bloblen, plen; | |
ffd7b36b | 1688 | u_int32_t seqnr, packets; |
1689 | u_int64_t blocks; | |
1853d1ef | 1690 | |
1588c277 | 1691 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1692 | |
1693 | buffer_init(&m); | |
b5a28cbc | 1694 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1695 | if (!compat20) { |
1696 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1697 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1698 | child_state.ssh1key = buffer_get_string(&m, |
1699 | &child_state.ssh1keylen); | |
1853d1ef | 1700 | child_state.ivout = buffer_get_string(&m, |
1701 | &child_state.ivoutlen); | |
1702 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1703 | goto skip; | |
1704 | } else { | |
1705 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1706 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1707 | } |
1708 | ||
1709 | blob = buffer_get_string(&m, &bloblen); | |
1710 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1711 | xfree(blob); | |
1712 | ||
1588c277 | 1713 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1714 | blob = buffer_get_string(&m, &bloblen); |
1715 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1716 | xfree(blob); | |
1717 | ||
1718 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1719 | seqnr = buffer_get_int(&m); |
1720 | blocks = buffer_get_int64(&m); | |
1721 | packets = buffer_get_int(&m); | |
1722 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1723 | seqnr = buffer_get_int(&m); | |
1724 | blocks = buffer_get_int64(&m); | |
1725 | packets = buffer_get_int(&m); | |
1726 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1727 | |
1728 | skip: | |
1729 | /* Get the key context */ | |
1730 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1731 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1732 | ||
1588c277 | 1733 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1734 | /* Get compression state */ |
1735 | p = buffer_get_string(&m, &plen); | |
1736 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1737 | fatal("%s: bad request size", __func__); |
1853d1ef | 1738 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1739 | xfree(p); | |
1740 | ||
1741 | p = buffer_get_string(&m, &plen); | |
1742 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1743 | fatal("%s: bad request size", __func__); |
1853d1ef | 1744 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1745 | xfree(p); | |
1746 | ||
1747 | /* Network I/O buffers */ | |
1588c277 | 1748 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1749 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1750 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1751 | ||
1752 | buffer_free(&m); | |
1753 | } | |
1754 | ||
1755 | ||
1756 | /* Allocation functions for zlib */ | |
1757 | void * | |
1758 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1759 | { | |
39e71188 | 1760 | size_t len = (size_t) size * ncount; |
1853d1ef | 1761 | void *address; |
1762 | ||
b85698ab | 1763 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1764 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1765 | ||
1766 | address = mm_malloc(mm, len); | |
1853d1ef | 1767 | |
1768 | return (address); | |
1769 | } | |
1770 | ||
1771 | void | |
1772 | mm_zfree(struct mm_master *mm, void *address) | |
1773 | { | |
1774 | mm_free(mm, address); | |
1775 | } | |
1776 | ||
1777 | void | |
1778 | mm_init_compression(struct mm_master *mm) | |
1779 | { | |
1780 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1781 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1782 | outgoing_stream.opaque = mm; | |
1783 | ||
1784 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1785 | incoming_stream.zfree = (free_func)mm_zfree; | |
1786 | incoming_stream.opaque = mm; | |
1787 | } | |
1788 | ||
1789 | /* XXX */ | |
1790 | ||
1791 | #define FD_CLOSEONEXEC(x) do { \ | |
1792 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1793 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1794 | } while (0) | |
1795 | ||
1796 | static void | |
1797 | monitor_socketpair(int *pair) | |
1798 | { | |
f1af2dbf | 1799 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1800 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1801 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1802 | #else |
1803 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1804 | __func__); |
f1af2dbf | 1805 | #endif |
1853d1ef | 1806 | FD_CLOSEONEXEC(pair[0]); |
1807 | FD_CLOSEONEXEC(pair[1]); | |
1808 | } | |
1809 | ||
1810 | #define MM_MEMSIZE 65536 | |
1811 | ||
1812 | struct monitor * | |
1813 | monitor_init(void) | |
1814 | { | |
1815 | struct monitor *mon; | |
1816 | int pair[2]; | |
1817 | ||
52e3daed | 1818 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1819 | |
1820 | monitor_socketpair(pair); | |
1821 | ||
1822 | mon->m_recvfd = pair[0]; | |
1823 | mon->m_sendfd = pair[1]; | |
1824 | ||
1825 | /* Used to share zlib space across processes */ | |
0496cf34 | 1826 | if (options.compression) { |
1827 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1828 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1829 | |
0496cf34 | 1830 | /* Compression needs to share state across borders */ |
1831 | mm_init_compression(mon->m_zlib); | |
1832 | } | |
1853d1ef | 1833 | |
1834 | return mon; | |
1835 | } | |
1836 | ||
1837 | void | |
1838 | monitor_reinit(struct monitor *mon) | |
1839 | { | |
1840 | int pair[2]; | |
1841 | ||
1842 | monitor_socketpair(pair); | |
1843 | ||
1844 | mon->m_recvfd = pair[0]; | |
1845 | mon->m_sendfd = pair[1]; | |
1846 | } | |
7364bd04 | 1847 | |
1848 | #ifdef GSSAPI | |
1849 | int | |
ca75d7de | 1850 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1851 | { |
ca75d7de | 1852 | gss_OID_desc goid; |
7364bd04 | 1853 | OM_uint32 major; |
1854 | u_int len; | |
1855 | ||
ca75d7de | 1856 | goid.elements = buffer_get_string(m, &len); |
1857 | goid.length = len; | |
7364bd04 | 1858 | |
ca75d7de | 1859 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1860 | |
ca75d7de | 1861 | xfree(goid.elements); |
7364bd04 | 1862 | |
1863 | buffer_clear(m); | |
1864 | buffer_put_int(m, major); | |
1865 | ||
8442cc66 | 1866 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1867 | |
1868 | /* Now we have a context, enable the step */ | |
1869 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1870 | ||
1871 | return (0); | |
1872 | } | |
1873 | ||
1874 | int | |
ca75d7de | 1875 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1876 | { |
1877 | gss_buffer_desc in; | |
1878 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1879 | OM_uint32 major, minor; |
7364bd04 | 1880 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1881 | u_int len; |
7364bd04 | 1882 | |
f99e1ca4 | 1883 | in.value = buffer_get_string(m, &len); |
1884 | in.length = len; | |
7364bd04 | 1885 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1886 | xfree(in.value); | |
1887 | ||
1888 | buffer_clear(m); | |
1889 | buffer_put_int(m, major); | |
1890 | buffer_put_string(m, out.value, out.length); | |
1891 | buffer_put_int(m, flags); | |
ca75d7de | 1892 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1893 | |
1894 | gss_release_buffer(&minor, &out); | |
1895 | ||
8442cc66 | 1896 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1897 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1898 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1899 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1900 | } |
1901 | return (0); | |
1902 | } | |
1903 | ||
0789992b | 1904 | int |
ca75d7de | 1905 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1906 | { |
1907 | gss_buffer_desc gssbuf, mic; | |
1908 | OM_uint32 ret; | |
1909 | u_int len; | |
b6453d99 | 1910 | |
0789992b | 1911 | gssbuf.value = buffer_get_string(m, &len); |
1912 | gssbuf.length = len; | |
1913 | mic.value = buffer_get_string(m, &len); | |
1914 | mic.length = len; | |
b6453d99 | 1915 | |
0789992b | 1916 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1917 | |
0789992b | 1918 | xfree(gssbuf.value); |
1919 | xfree(mic.value); | |
b6453d99 | 1920 | |
0789992b | 1921 | buffer_clear(m); |
1922 | buffer_put_int(m, ret); | |
b6453d99 | 1923 | |
ca75d7de | 1924 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1925 | |
0789992b | 1926 | if (!GSS_ERROR(ret)) |
1927 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1928 | |
0789992b | 1929 | return (0); |
1930 | } | |
1931 | ||
7364bd04 | 1932 | int |
ca75d7de | 1933 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1934 | { |
1935 | int authenticated; | |
1936 | ||
1937 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1938 | ||
1939 | buffer_clear(m); | |
1940 | buffer_put_int(m, authenticated); | |
1941 | ||
1942 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1943 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1944 | |
8442cc66 | 1945 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1946 | |
1947 | /* Monitor loop will terminate if authenticated */ | |
1948 | return (authenticated); | |
1949 | } | |
1950 | #endif /* GSSAPI */ |