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d3221cca | 1 | /* $OpenBSD: monitor.c,v 1.80 2006/07/09 15:15:10 stevesk Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
aa2eae64 | 29 | |
30 | #include <sys/types.h> | |
5b04a8bf | 31 | #include <sys/socket.h> |
aa2eae64 | 32 | #include <sys/wait.h> |
1853d1ef | 33 | |
d3221cca | 34 | #include <fcntl.h> |
b5b88c19 | 35 | #ifdef HAVE_PATHS_H |
a75f5360 | 36 | #include <paths.h> |
b5b88c19 | 37 | #endif |
b1842393 | 38 | #include <pwd.h> |
ada68823 | 39 | #include <signal.h> |
1853d1ef | 40 | |
41 | #ifdef SKEY | |
42 | #include <skey.h> | |
43 | #endif | |
44 | ||
a75f5360 | 45 | #include <openssl/dh.h> |
46 | ||
1853d1ef | 47 | #include "ssh.h" |
48 | #include "auth.h" | |
49 | #include "kex.h" | |
50 | #include "dh.h" | |
a655c012 | 51 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
52 | #undef TARGET_OS_MAC | |
9b08c23f | 53 | #include "zlib.h" |
a655c012 | 54 | #define TARGET_OS_MAC 1 |
55 | #else | |
56 | #include "zlib.h" | |
57 | #endif | |
1853d1ef | 58 | #include "packet.h" |
59 | #include "auth-options.h" | |
60 | #include "sshpty.h" | |
61 | #include "channels.h" | |
62 | #include "session.h" | |
63 | #include "sshlogin.h" | |
64 | #include "canohost.h" | |
65 | #include "log.h" | |
66 | #include "servconf.h" | |
67 | #include "monitor.h" | |
68 | #include "monitor_mm.h" | |
69 | #include "monitor_wrap.h" | |
70 | #include "monitor_fdpass.h" | |
71 | #include "xmalloc.h" | |
72 | #include "misc.h" | |
73 | #include "buffer.h" | |
74 | #include "bufaux.h" | |
75 | #include "compat.h" | |
76 | #include "ssh2.h" | |
1853d1ef | 77 | |
7364bd04 | 78 | #ifdef GSSAPI |
79 | #include "ssh-gss.h" | |
80 | static Gssctxt *gsscontext = NULL; | |
81 | #endif | |
82 | ||
1853d1ef | 83 | /* Imports */ |
84 | extern ServerOptions options; | |
85 | extern u_int utmp_len; | |
86 | extern Newkeys *current_keys[]; | |
87 | extern z_stream incoming_stream; | |
88 | extern z_stream outgoing_stream; | |
89 | extern u_char session_id[]; | |
90 | extern Buffer input, output; | |
91 | extern Buffer auth_debug; | |
92 | extern int auth_debug_init; | |
be2ca0c9 | 93 | extern Buffer loginmsg; |
1853d1ef | 94 | |
95 | /* State exported from the child */ | |
96 | ||
97 | struct { | |
98 | z_stream incoming; | |
99 | z_stream outgoing; | |
100 | u_char *keyin; | |
101 | u_int keyinlen; | |
102 | u_char *keyout; | |
103 | u_int keyoutlen; | |
104 | u_char *ivin; | |
105 | u_int ivinlen; | |
106 | u_char *ivout; | |
107 | u_int ivoutlen; | |
9459414c | 108 | u_char *ssh1key; |
109 | u_int ssh1keylen; | |
1853d1ef | 110 | int ssh1cipher; |
111 | int ssh1protoflags; | |
112 | u_char *input; | |
113 | u_int ilen; | |
114 | u_char *output; | |
115 | u_int olen; | |
116 | } child_state; | |
117 | ||
b8e04133 | 118 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 119 | |
120 | int mm_answer_moduli(int, Buffer *); | |
121 | int mm_answer_sign(int, Buffer *); | |
122 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 123 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 124 | int mm_answer_authserv(int, Buffer *); |
125 | int mm_answer_authpassword(int, Buffer *); | |
126 | int mm_answer_bsdauthquery(int, Buffer *); | |
127 | int mm_answer_bsdauthrespond(int, Buffer *); | |
128 | int mm_answer_skeyquery(int, Buffer *); | |
129 | int mm_answer_skeyrespond(int, Buffer *); | |
130 | int mm_answer_keyallowed(int, Buffer *); | |
131 | int mm_answer_keyverify(int, Buffer *); | |
132 | int mm_answer_pty(int, Buffer *); | |
133 | int mm_answer_pty_cleanup(int, Buffer *); | |
134 | int mm_answer_term(int, Buffer *); | |
135 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
136 | int mm_answer_rsa_challenge(int, Buffer *); | |
137 | int mm_answer_rsa_response(int, Buffer *); | |
138 | int mm_answer_sesskey(int, Buffer *); | |
139 | int mm_answer_sessid(int, Buffer *); | |
140 | ||
ad200abb | 141 | #ifdef USE_PAM |
142 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 143 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 144 | int mm_answer_pam_init_ctx(int, Buffer *); |
145 | int mm_answer_pam_query(int, Buffer *); | |
146 | int mm_answer_pam_respond(int, Buffer *); | |
147 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 148 | #endif |
149 | ||
7364bd04 | 150 | #ifdef GSSAPI |
151 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
152 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
153 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 154 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 155 | #endif |
696f6bef | 156 | |
6039eeef | 157 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 158 | int mm_answer_audit_event(int, Buffer *); |
159 | int mm_answer_audit_command(int, Buffer *); | |
160 | #endif | |
161 | ||
1853d1ef | 162 | static Authctxt *authctxt; |
163 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
164 | ||
165 | /* local state for key verify */ | |
166 | static u_char *key_blob = NULL; | |
167 | static u_int key_bloblen = 0; | |
168 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 169 | static char *hostbased_cuser = NULL; |
170 | static char *hostbased_chost = NULL; | |
1853d1ef | 171 | static char *auth_method = "unknown"; |
a27002e5 | 172 | static u_int session_id2_len = 0; |
521d606b | 173 | static u_char *session_id2 = NULL; |
3a39206f | 174 | static pid_t monitor_child_pid; |
1853d1ef | 175 | |
176 | struct mon_table { | |
177 | enum monitor_reqtype type; | |
178 | int flags; | |
179 | int (*f)(int, Buffer *); | |
180 | }; | |
181 | ||
182 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
183 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
184 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 185 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 186 | |
187 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
188 | ||
189 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
190 | ||
191 | struct mon_table mon_dispatch_proto20[] = { | |
192 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
193 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
194 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
195 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 196 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 197 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 198 | #ifdef USE_PAM |
199 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 200 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 201 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
202 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
203 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
204 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 205 | #endif |
6039eeef | 206 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 207 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 208 | #endif |
1853d1ef | 209 | #ifdef BSD_AUTH |
210 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 211 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 212 | #endif |
213 | #ifdef SKEY | |
214 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
215 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
216 | #endif | |
217 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
218 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 219 | #ifdef GSSAPI |
220 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
221 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
222 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 223 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 224 | #endif |
1853d1ef | 225 | {0, 0, NULL} |
226 | }; | |
227 | ||
228 | struct mon_table mon_dispatch_postauth20[] = { | |
229 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
230 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
231 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
232 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
233 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 234 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 235 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
236 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
237 | #endif | |
1853d1ef | 238 | {0, 0, NULL} |
239 | }; | |
240 | ||
241 | struct mon_table mon_dispatch_proto15[] = { | |
242 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
243 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
244 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
245 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 246 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
247 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 248 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
249 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
250 | #ifdef BSD_AUTH | |
251 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 252 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 253 | #endif |
254 | #ifdef SKEY | |
255 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
256 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 257 | #endif |
258 | #ifdef USE_PAM | |
259 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 260 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 261 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
262 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
263 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
264 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 265 | #endif |
6039eeef | 266 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 267 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 268 | #endif |
269 | {0, 0, NULL} | |
270 | }; | |
271 | ||
272 | struct mon_table mon_dispatch_postauth15[] = { | |
273 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
274 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
275 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 276 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 277 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 278 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 279 | #endif |
1853d1ef | 280 | {0, 0, NULL} |
281 | }; | |
282 | ||
283 | struct mon_table *mon_dispatch; | |
284 | ||
285 | /* Specifies if a certain message is allowed at the moment */ | |
286 | ||
287 | static void | |
288 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
289 | { | |
290 | while (ent->f != NULL) { | |
291 | if (ent->type == type) { | |
292 | ent->flags &= ~MON_PERMIT; | |
293 | ent->flags |= permit ? MON_PERMIT : 0; | |
294 | return; | |
295 | } | |
296 | ent++; | |
297 | } | |
298 | } | |
299 | ||
300 | static void | |
301 | monitor_permit_authentications(int permit) | |
302 | { | |
303 | struct mon_table *ent = mon_dispatch; | |
304 | ||
305 | while (ent->f != NULL) { | |
306 | if (ent->flags & MON_AUTH) { | |
307 | ent->flags &= ~MON_PERMIT; | |
308 | ent->flags |= permit ? MON_PERMIT : 0; | |
309 | } | |
310 | ent++; | |
311 | } | |
312 | } | |
313 | ||
2362db19 | 314 | void |
315 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 316 | { |
317 | struct mon_table *ent; | |
318 | int authenticated = 0; | |
319 | ||
320 | debug3("preauth child monitor started"); | |
321 | ||
2362db19 | 322 | authctxt = _authctxt; |
323 | memset(authctxt, 0, sizeof(*authctxt)); | |
324 | ||
e05df884 | 325 | authctxt->loginmsg = &loginmsg; |
326 | ||
1853d1ef | 327 | if (compat20) { |
328 | mon_dispatch = mon_dispatch_proto20; | |
329 | ||
330 | /* Permit requests for moduli and signatures */ | |
331 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
332 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
333 | } else { | |
334 | mon_dispatch = mon_dispatch_proto15; | |
335 | ||
336 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
337 | } | |
338 | ||
1853d1ef | 339 | /* The first few requests do not require asynchronous access */ |
340 | while (!authenticated) { | |
c023a130 | 341 | auth_method = "unknown"; |
b5a28cbc | 342 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 343 | if (authenticated) { |
344 | if (!(ent->flags & MON_AUTHDECIDE)) | |
345 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 346 | __func__, ent->type); |
1853d1ef | 347 | if (authctxt->pw->pw_uid == 0 && |
348 | !auth_root_allowed(auth_method)) | |
349 | authenticated = 0; | |
5b9e2464 | 350 | #ifdef USE_PAM |
351 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 352 | if (options.use_pam && authenticated) { |
5b9e2464 | 353 | Buffer m; |
354 | ||
355 | buffer_init(&m); | |
aff51935 | 356 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 357 | MONITOR_REQ_PAM_ACCOUNT, &m); |
358 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
359 | buffer_free(&m); | |
360 | } | |
361 | #endif | |
1853d1ef | 362 | } |
363 | ||
c023a130 | 364 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 365 | auth_log(authctxt, authenticated, auth_method, |
366 | compat20 ? " ssh2" : ""); | |
367 | if (!authenticated) | |
368 | authctxt->failures++; | |
369 | } | |
370 | } | |
371 | ||
372 | if (!authctxt->valid) | |
1588c277 | 373 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 374 | if (strcmp(auth_method, "unknown") == 0) |
375 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 376 | |
377 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 378 | __func__, authctxt->user); |
1853d1ef | 379 | |
b5a28cbc | 380 | mm_get_keystate(pmonitor); |
1853d1ef | 381 | } |
382 | ||
3a39206f | 383 | static void |
384 | monitor_set_child_handler(pid_t pid) | |
385 | { | |
386 | monitor_child_pid = pid; | |
387 | } | |
388 | ||
389 | static void | |
ca75d7de | 390 | monitor_child_handler(int sig) |
3a39206f | 391 | { |
ca75d7de | 392 | kill(monitor_child_pid, sig); |
3a39206f | 393 | } |
394 | ||
1853d1ef | 395 | void |
b5a28cbc | 396 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 397 | { |
3a39206f | 398 | monitor_set_child_handler(pmonitor->m_pid); |
399 | signal(SIGHUP, &monitor_child_handler); | |
400 | signal(SIGTERM, &monitor_child_handler); | |
401 | ||
1853d1ef | 402 | if (compat20) { |
403 | mon_dispatch = mon_dispatch_postauth20; | |
404 | ||
405 | /* Permit requests for moduli and signatures */ | |
406 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
407 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
408 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 409 | } else { |
410 | mon_dispatch = mon_dispatch_postauth15; | |
411 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
412 | } | |
413 | if (!no_pty_flag) { | |
414 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
415 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
416 | } | |
417 | ||
418 | for (;;) | |
b5a28cbc | 419 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 420 | } |
421 | ||
422 | void | |
b5a28cbc | 423 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 424 | { |
0496cf34 | 425 | if (options.compression) { |
426 | /* The member allocation is not visible, so sync it */ | |
427 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
428 | } | |
1853d1ef | 429 | } |
430 | ||
431 | int | |
b5a28cbc | 432 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 433 | struct mon_table **pent) |
434 | { | |
435 | Buffer m; | |
436 | int ret; | |
437 | u_char type; | |
438 | ||
439 | buffer_init(&m); | |
440 | ||
b5a28cbc | 441 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 442 | type = buffer_get_char(&m); |
443 | ||
1588c277 | 444 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 445 | |
446 | while (ent->f != NULL) { | |
447 | if (ent->type == type) | |
448 | break; | |
449 | ent++; | |
450 | } | |
451 | ||
452 | if (ent->f != NULL) { | |
453 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 454 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 455 | type); |
b5a28cbc | 456 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 457 | buffer_free(&m); |
458 | ||
459 | /* The child may use this request only once, disable it */ | |
460 | if (ent->flags & MON_ONCE) { | |
1588c277 | 461 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 462 | type); |
463 | ent->flags &= ~MON_PERMIT; | |
464 | } | |
465 | ||
466 | if (pent != NULL) | |
467 | *pent = ent; | |
468 | ||
469 | return ret; | |
470 | } | |
471 | ||
1588c277 | 472 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 473 | |
474 | /* NOTREACHED */ | |
475 | return (-1); | |
476 | } | |
477 | ||
478 | /* allowed key state */ | |
479 | static int | |
480 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
481 | { | |
482 | /* make sure key is allowed */ | |
483 | if (key_blob == NULL || key_bloblen != bloblen || | |
484 | memcmp(key_blob, blob, key_bloblen)) | |
485 | return (0); | |
486 | return (1); | |
487 | } | |
488 | ||
489 | static void | |
490 | monitor_reset_key_state(void) | |
491 | { | |
492 | /* reset state */ | |
493 | if (key_blob != NULL) | |
494 | xfree(key_blob); | |
495 | if (hostbased_cuser != NULL) | |
496 | xfree(hostbased_cuser); | |
497 | if (hostbased_chost != NULL) | |
498 | xfree(hostbased_chost); | |
499 | key_blob = NULL; | |
500 | key_bloblen = 0; | |
501 | key_blobtype = MM_NOKEY; | |
502 | hostbased_cuser = NULL; | |
503 | hostbased_chost = NULL; | |
504 | } | |
505 | ||
506 | int | |
ca75d7de | 507 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 508 | { |
509 | DH *dh; | |
510 | int min, want, max; | |
511 | ||
512 | min = buffer_get_int(m); | |
513 | want = buffer_get_int(m); | |
514 | max = buffer_get_int(m); | |
515 | ||
516 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 517 | __func__, min, want, max); |
1853d1ef | 518 | /* We need to check here, too, in case the child got corrupted */ |
519 | if (max < min || want < min || max < want) | |
520 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 521 | __func__, min, want, max); |
1853d1ef | 522 | |
523 | buffer_clear(m); | |
524 | ||
525 | dh = choose_dh(min, want, max); | |
526 | if (dh == NULL) { | |
527 | buffer_put_char(m, 0); | |
528 | return (0); | |
529 | } else { | |
530 | /* Send first bignum */ | |
531 | buffer_put_char(m, 1); | |
532 | buffer_put_bignum2(m, dh->p); | |
533 | buffer_put_bignum2(m, dh->g); | |
534 | ||
535 | DH_free(dh); | |
536 | } | |
ca75d7de | 537 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 538 | return (0); |
539 | } | |
540 | ||
541 | int | |
ca75d7de | 542 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 543 | { |
544 | Key *key; | |
545 | u_char *p; | |
546 | u_char *signature; | |
547 | u_int siglen, datlen; | |
548 | int keyid; | |
549 | ||
1588c277 | 550 | debug3("%s", __func__); |
1853d1ef | 551 | |
552 | keyid = buffer_get_int(m); | |
553 | p = buffer_get_string(m, &datlen); | |
554 | ||
2ff8003a | 555 | /* |
b4bbf172 | 556 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 557 | * SHA256 (32 byte) hashes |
558 | */ | |
559 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 560 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 561 | |
521d606b | 562 | /* save session id, it will be passed on the first call */ |
563 | if (session_id2_len == 0) { | |
564 | session_id2_len = datlen; | |
565 | session_id2 = xmalloc(session_id2_len); | |
566 | memcpy(session_id2, p, session_id2_len); | |
567 | } | |
568 | ||
1853d1ef | 569 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 570 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 571 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 572 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 573 | |
d1ff09ba | 574 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 575 | |
576 | buffer_clear(m); | |
577 | buffer_put_string(m, signature, siglen); | |
578 | ||
579 | xfree(p); | |
580 | xfree(signature); | |
581 | ||
ca75d7de | 582 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 583 | |
584 | /* Turn on permissions for getpwnam */ | |
585 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
586 | ||
587 | return (0); | |
588 | } | |
589 | ||
590 | /* Retrieves the password entry and also checks if the user is permitted */ | |
591 | ||
592 | int | |
ca75d7de | 593 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 594 | { |
18a8f313 | 595 | char *username; |
1853d1ef | 596 | struct passwd *pwent; |
597 | int allowed = 0; | |
598 | ||
1588c277 | 599 | debug3("%s", __func__); |
1853d1ef | 600 | |
601 | if (authctxt->attempt++ != 0) | |
1588c277 | 602 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 603 | |
18a8f313 | 604 | username = buffer_get_string(m, NULL); |
1853d1ef | 605 | |
18a8f313 | 606 | pwent = getpwnamallow(username); |
1853d1ef | 607 | |
18a8f313 | 608 | authctxt->user = xstrdup(username); |
609 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
610 | xfree(username); | |
1853d1ef | 611 | |
612 | buffer_clear(m); | |
613 | ||
614 | if (pwent == NULL) { | |
615 | buffer_put_char(m, 0); | |
b2a5802b | 616 | authctxt->pw = fakepw(); |
1853d1ef | 617 | goto out; |
618 | } | |
619 | ||
620 | allowed = 1; | |
621 | authctxt->pw = pwent; | |
622 | authctxt->valid = 1; | |
623 | ||
624 | buffer_put_char(m, 1); | |
625 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
626 | buffer_put_cstring(m, pwent->pw_name); | |
627 | buffer_put_cstring(m, "*"); | |
628 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 629 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 630 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 631 | #endif |
1853d1ef | 632 | buffer_put_cstring(m, pwent->pw_dir); |
633 | buffer_put_cstring(m, pwent->pw_shell); | |
634 | ||
635 | out: | |
1588c277 | 636 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 637 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 638 | |
639 | /* For SSHv1 allow authentication now */ | |
640 | if (!compat20) | |
641 | monitor_permit_authentications(1); | |
94a73cdc | 642 | else { |
1853d1ef | 643 | /* Allow service/style information on the auth context */ |
644 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 645 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
646 | } | |
1853d1ef | 647 | |
efe44db6 | 648 | #ifdef USE_PAM |
7fceb20d | 649 | if (options.use_pam) |
650 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 651 | #endif |
6039eeef | 652 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 653 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 654 | #endif |
1853d1ef | 655 | |
656 | return (0); | |
657 | } | |
658 | ||
ca75d7de | 659 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 660 | { |
661 | char *banner; | |
662 | ||
663 | buffer_clear(m); | |
664 | banner = auth2_read_banner(); | |
665 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 666 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 667 | |
668 | if (banner != NULL) | |
30e37ee6 | 669 | xfree(banner); |
94a73cdc | 670 | |
671 | return (0); | |
672 | } | |
673 | ||
1853d1ef | 674 | int |
ca75d7de | 675 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 676 | { |
677 | monitor_permit_authentications(1); | |
678 | ||
679 | authctxt->service = buffer_get_string(m, NULL); | |
680 | authctxt->style = buffer_get_string(m, NULL); | |
681 | debug3("%s: service=%s, style=%s", | |
1588c277 | 682 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 683 | |
684 | if (strlen(authctxt->style) == 0) { | |
685 | xfree(authctxt->style); | |
686 | authctxt->style = NULL; | |
687 | } | |
688 | ||
689 | return (0); | |
690 | } | |
691 | ||
692 | int | |
ca75d7de | 693 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 694 | { |
695 | static int call_count; | |
696 | char *passwd; | |
d341742a | 697 | int authenticated; |
698 | u_int plen; | |
1853d1ef | 699 | |
700 | passwd = buffer_get_string(m, &plen); | |
701 | /* Only authenticate if the context is valid */ | |
aa586f8e | 702 | authenticated = options.password_authentication && |
96d0bf74 | 703 | auth_password(authctxt, passwd); |
1853d1ef | 704 | memset(passwd, 0, strlen(passwd)); |
705 | xfree(passwd); | |
706 | ||
707 | buffer_clear(m); | |
708 | buffer_put_int(m, authenticated); | |
709 | ||
1588c277 | 710 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 711 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 712 | |
713 | call_count++; | |
714 | if (plen == 0 && call_count == 1) | |
715 | auth_method = "none"; | |
716 | else | |
717 | auth_method = "password"; | |
718 | ||
719 | /* Causes monitor loop to terminate if authenticated */ | |
720 | return (authenticated); | |
721 | } | |
722 | ||
723 | #ifdef BSD_AUTH | |
724 | int | |
ca75d7de | 725 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 726 | { |
727 | char *name, *infotxt; | |
728 | u_int numprompts; | |
729 | u_int *echo_on; | |
730 | char **prompts; | |
6d6c25e3 | 731 | u_int success; |
1853d1ef | 732 | |
6d6c25e3 | 733 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
734 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 735 | |
736 | buffer_clear(m); | |
6d6c25e3 | 737 | buffer_put_int(m, success); |
738 | if (success) | |
1853d1ef | 739 | buffer_put_cstring(m, prompts[0]); |
740 | ||
6d6c25e3 | 741 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 742 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 743 | |
6d6c25e3 | 744 | if (success) { |
1853d1ef | 745 | xfree(name); |
746 | xfree(infotxt); | |
747 | xfree(prompts); | |
748 | xfree(echo_on); | |
749 | } | |
750 | ||
751 | return (0); | |
752 | } | |
753 | ||
754 | int | |
ca75d7de | 755 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 756 | { |
757 | char *response; | |
758 | int authok; | |
759 | ||
760 | if (authctxt->as == 0) | |
1588c277 | 761 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 762 | |
763 | response = buffer_get_string(m, NULL); | |
aa586f8e | 764 | authok = options.challenge_response_authentication && |
765 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 766 | authctxt->as = NULL; |
1588c277 | 767 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 768 | xfree(response); |
769 | ||
770 | buffer_clear(m); | |
771 | buffer_put_int(m, authok); | |
772 | ||
1588c277 | 773 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 774 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 775 | |
776 | auth_method = "bsdauth"; | |
777 | ||
778 | return (authok != 0); | |
779 | } | |
780 | #endif | |
781 | ||
782 | #ifdef SKEY | |
783 | int | |
ca75d7de | 784 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 785 | { |
786 | struct skey skey; | |
787 | char challenge[1024]; | |
6d6c25e3 | 788 | u_int success; |
1853d1ef | 789 | |
f2b7b5c8 | 790 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
791 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 792 | |
793 | buffer_clear(m); | |
6d6c25e3 | 794 | buffer_put_int(m, success); |
795 | if (success) | |
1853d1ef | 796 | buffer_put_cstring(m, challenge); |
797 | ||
6d6c25e3 | 798 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 799 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 800 | |
801 | return (0); | |
802 | } | |
803 | ||
804 | int | |
ca75d7de | 805 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 806 | { |
807 | char *response; | |
808 | int authok; | |
809 | ||
810 | response = buffer_get_string(m, NULL); | |
811 | ||
aa586f8e | 812 | authok = (options.challenge_response_authentication && |
813 | authctxt->valid && | |
1853d1ef | 814 | skey_haskey(authctxt->pw->pw_name) == 0 && |
815 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
816 | ||
817 | xfree(response); | |
818 | ||
819 | buffer_clear(m); | |
820 | buffer_put_int(m, authok); | |
821 | ||
1588c277 | 822 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 823 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 824 | |
825 | auth_method = "skey"; | |
826 | ||
827 | return (authok != 0); | |
828 | } | |
829 | #endif | |
830 | ||
ad200abb | 831 | #ifdef USE_PAM |
832 | int | |
8b3ec5fd | 833 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 834 | { |
7fceb20d | 835 | if (!options.use_pam) |
836 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
837 | ||
529d73ab | 838 | start_pam(authctxt); |
ad200abb | 839 | |
5b9e2464 | 840 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
841 | ||
ad200abb | 842 | return (0); |
843 | } | |
05114c74 | 844 | |
5b9e2464 | 845 | int |
8b3ec5fd | 846 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 847 | { |
848 | u_int ret; | |
b6453d99 | 849 | |
5b9e2464 | 850 | if (!options.use_pam) |
851 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
852 | ||
853 | ret = do_pam_account(); | |
854 | ||
855 | buffer_put_int(m, ret); | |
cfb60d3a | 856 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 857 | |
8b3ec5fd | 858 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 859 | |
860 | return (ret); | |
861 | } | |
862 | ||
05114c74 | 863 | static void *sshpam_ctxt, *sshpam_authok; |
864 | extern KbdintDevice sshpam_device; | |
865 | ||
866 | int | |
8b3ec5fd | 867 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 868 | { |
869 | ||
870 | debug3("%s", __func__); | |
871 | authctxt->user = buffer_get_string(m, NULL); | |
872 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
873 | sshpam_authok = NULL; | |
874 | buffer_clear(m); | |
875 | if (sshpam_ctxt != NULL) { | |
876 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
877 | buffer_put_int(m, 1); | |
878 | } else { | |
879 | buffer_put_int(m, 0); | |
880 | } | |
8b3ec5fd | 881 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 882 | return (0); |
883 | } | |
884 | ||
885 | int | |
8b3ec5fd | 886 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 887 | { |
888 | char *name, *info, **prompts; | |
a1a073cc | 889 | u_int i, num, *echo_on; |
890 | int ret; | |
05114c74 | 891 | |
892 | debug3("%s", __func__); | |
893 | sshpam_authok = NULL; | |
894 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
895 | if (ret == 0 && num == 0) | |
896 | sshpam_authok = sshpam_ctxt; | |
897 | if (num > 1 || name == NULL || info == NULL) | |
898 | ret = -1; | |
899 | buffer_clear(m); | |
900 | buffer_put_int(m, ret); | |
901 | buffer_put_cstring(m, name); | |
902 | xfree(name); | |
903 | buffer_put_cstring(m, info); | |
904 | xfree(info); | |
905 | buffer_put_int(m, num); | |
906 | for (i = 0; i < num; ++i) { | |
907 | buffer_put_cstring(m, prompts[i]); | |
908 | xfree(prompts[i]); | |
909 | buffer_put_int(m, echo_on[i]); | |
910 | } | |
911 | if (prompts != NULL) | |
912 | xfree(prompts); | |
913 | if (echo_on != NULL) | |
914 | xfree(echo_on); | |
2ae7f715 | 915 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 916 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 917 | return (0); |
918 | } | |
919 | ||
920 | int | |
8b3ec5fd | 921 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 922 | { |
923 | char **resp; | |
a1a073cc | 924 | u_int i, num; |
925 | int ret; | |
05114c74 | 926 | |
927 | debug3("%s", __func__); | |
928 | sshpam_authok = NULL; | |
929 | num = buffer_get_int(m); | |
930 | if (num > 0) { | |
01d35895 | 931 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 932 | for (i = 0; i < num; ++i) |
933 | resp[i] = buffer_get_string(m, NULL); | |
934 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
935 | for (i = 0; i < num; ++i) | |
936 | xfree(resp[i]); | |
937 | xfree(resp); | |
938 | } else { | |
939 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
940 | } | |
941 | buffer_clear(m); | |
942 | buffer_put_int(m, ret); | |
8b3ec5fd | 943 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 944 | auth_method = "keyboard-interactive/pam"; |
945 | if (ret == 0) | |
946 | sshpam_authok = sshpam_ctxt; | |
947 | return (0); | |
948 | } | |
949 | ||
950 | int | |
8b3ec5fd | 951 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 952 | { |
953 | ||
954 | debug3("%s", __func__); | |
955 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
956 | buffer_clear(m); | |
8b3ec5fd | 957 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 958 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 959 | return (sshpam_authok == sshpam_ctxt); |
960 | } | |
ad200abb | 961 | #endif |
962 | ||
1853d1ef | 963 | static void |
964 | mm_append_debug(Buffer *m) | |
965 | { | |
966 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 967 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 968 | buffer_append(m, buffer_ptr(&auth_debug), |
969 | buffer_len(&auth_debug)); | |
970 | buffer_clear(&auth_debug); | |
971 | } | |
972 | } | |
973 | ||
974 | int | |
ca75d7de | 975 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 976 | { |
977 | Key *key; | |
661e45a0 | 978 | char *cuser, *chost; |
979 | u_char *blob; | |
1853d1ef | 980 | u_int bloblen; |
981 | enum mm_keytype type = 0; | |
982 | int allowed = 0; | |
983 | ||
1588c277 | 984 | debug3("%s entering", __func__); |
1853d1ef | 985 | |
986 | type = buffer_get_int(m); | |
987 | cuser = buffer_get_string(m, NULL); | |
988 | chost = buffer_get_string(m, NULL); | |
989 | blob = buffer_get_string(m, &bloblen); | |
990 | ||
991 | key = key_from_blob(blob, bloblen); | |
992 | ||
993 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
994 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 995 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 996 | |
1588c277 | 997 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 998 | |
fdaef11e | 999 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1000 | switch (type) { |
1853d1ef | 1001 | case MM_USERKEY: |
aa586f8e | 1002 | allowed = options.pubkey_authentication && |
1003 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1004 | auth_method = "publickey"; |
1853d1ef | 1005 | break; |
1006 | case MM_HOSTKEY: | |
aa586f8e | 1007 | allowed = options.hostbased_authentication && |
1008 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1009 | cuser, chost, key); |
c023a130 | 1010 | auth_method = "hostbased"; |
1853d1ef | 1011 | break; |
1012 | case MM_RSAHOSTKEY: | |
1013 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1014 | allowed = options.rhosts_rsa_authentication && |
1015 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1016 | cuser, chost, key); |
c023a130 | 1017 | auth_method = "rsa"; |
1853d1ef | 1018 | break; |
1019 | default: | |
1588c277 | 1020 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1021 | break; |
1022 | } | |
1853d1ef | 1023 | } |
3e2f2431 | 1024 | if (key != NULL) |
1025 | key_free(key); | |
1853d1ef | 1026 | |
1027 | /* clear temporarily storage (used by verify) */ | |
1028 | monitor_reset_key_state(); | |
1029 | ||
1030 | if (allowed) { | |
1031 | /* Save temporarily for comparison in verify */ | |
1032 | key_blob = blob; | |
1033 | key_bloblen = bloblen; | |
1034 | key_blobtype = type; | |
1035 | hostbased_cuser = cuser; | |
1036 | hostbased_chost = chost; | |
98d40a74 | 1037 | } else { |
c023a130 | 1038 | /* Log failed attempt */ |
1039 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1040 | xfree(blob); |
1041 | xfree(cuser); | |
1042 | xfree(chost); | |
1853d1ef | 1043 | } |
1044 | ||
1045 | debug3("%s: key %p is %s", | |
1588c277 | 1046 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1047 | |
1048 | buffer_clear(m); | |
1049 | buffer_put_int(m, allowed); | |
92e15201 | 1050 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1051 | |
1052 | mm_append_debug(m); | |
1053 | ||
ca75d7de | 1054 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1055 | |
1056 | if (type == MM_RSAHOSTKEY) | |
1057 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1058 | ||
1059 | return (0); | |
1060 | } | |
1061 | ||
1062 | static int | |
1063 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1064 | { | |
1065 | Buffer b; | |
661e45a0 | 1066 | char *p; |
1853d1ef | 1067 | u_int len; |
1068 | int fail = 0; | |
1853d1ef | 1069 | |
1070 | buffer_init(&b); | |
1071 | buffer_append(&b, data, datalen); | |
1072 | ||
1073 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1074 | p = buffer_ptr(&b); |
1075 | len = buffer_len(&b); | |
1076 | if ((session_id2 == NULL) || | |
1077 | (len < session_id2_len) || | |
1078 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1079 | fail++; | |
1853d1ef | 1080 | buffer_consume(&b, session_id2_len); |
1081 | } else { | |
521d606b | 1082 | p = buffer_get_string(&b, &len); |
1083 | if ((session_id2 == NULL) || | |
1084 | (len != session_id2_len) || | |
1085 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1086 | fail++; |
521d606b | 1087 | xfree(p); |
1853d1ef | 1088 | } |
1089 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1090 | fail++; | |
1091 | p = buffer_get_string(&b, NULL); | |
1092 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1093 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1094 | authctxt->user, p); |
1095 | fail++; | |
1096 | } | |
1097 | xfree(p); | |
1098 | buffer_skip_string(&b); | |
1099 | if (datafellows & SSH_BUG_PKAUTH) { | |
1100 | if (!buffer_get_char(&b)) | |
1101 | fail++; | |
1102 | } else { | |
1103 | p = buffer_get_string(&b, NULL); | |
1104 | if (strcmp("publickey", p) != 0) | |
1105 | fail++; | |
1106 | xfree(p); | |
1107 | if (!buffer_get_char(&b)) | |
1108 | fail++; | |
1109 | buffer_skip_string(&b); | |
1110 | } | |
1111 | buffer_skip_string(&b); | |
1112 | if (buffer_len(&b) != 0) | |
1113 | fail++; | |
1114 | buffer_free(&b); | |
1115 | return (fail == 0); | |
1116 | } | |
1117 | ||
1118 | static int | |
661e45a0 | 1119 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1120 | char *chost) | |
1853d1ef | 1121 | { |
1122 | Buffer b; | |
661e45a0 | 1123 | char *p; |
1853d1ef | 1124 | u_int len; |
1125 | int fail = 0; | |
1853d1ef | 1126 | |
1127 | buffer_init(&b); | |
1128 | buffer_append(&b, data, datalen); | |
1129 | ||
521d606b | 1130 | p = buffer_get_string(&b, &len); |
1131 | if ((session_id2 == NULL) || | |
1132 | (len != session_id2_len) || | |
1133 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1134 | fail++; |
521d606b | 1135 | xfree(p); |
1136 | ||
1853d1ef | 1137 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1138 | fail++; | |
1139 | p = buffer_get_string(&b, NULL); | |
1140 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1141 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1142 | authctxt->user, p); |
1143 | fail++; | |
1144 | } | |
1145 | xfree(p); | |
1146 | buffer_skip_string(&b); /* service */ | |
1147 | p = buffer_get_string(&b, NULL); | |
1148 | if (strcmp(p, "hostbased") != 0) | |
1149 | fail++; | |
1150 | xfree(p); | |
1151 | buffer_skip_string(&b); /* pkalg */ | |
1152 | buffer_skip_string(&b); /* pkblob */ | |
1153 | ||
1154 | /* verify client host, strip trailing dot if necessary */ | |
1155 | p = buffer_get_string(&b, NULL); | |
1156 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1157 | p[len - 1] = '\0'; | |
1158 | if (strcmp(p, chost) != 0) | |
1159 | fail++; | |
1160 | xfree(p); | |
1161 | ||
1162 | /* verify client user */ | |
1163 | p = buffer_get_string(&b, NULL); | |
1164 | if (strcmp(p, cuser) != 0) | |
1165 | fail++; | |
1166 | xfree(p); | |
1167 | ||
1168 | if (buffer_len(&b) != 0) | |
1169 | fail++; | |
1170 | buffer_free(&b); | |
1171 | return (fail == 0); | |
1172 | } | |
1173 | ||
1174 | int | |
ca75d7de | 1175 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1176 | { |
1177 | Key *key; | |
1178 | u_char *signature, *data, *blob; | |
1179 | u_int signaturelen, datalen, bloblen; | |
1180 | int verified = 0; | |
1181 | int valid_data = 0; | |
1182 | ||
1183 | blob = buffer_get_string(m, &bloblen); | |
1184 | signature = buffer_get_string(m, &signaturelen); | |
1185 | data = buffer_get_string(m, &datalen); | |
1186 | ||
1187 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1188 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1189 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1190 | |
1191 | key = key_from_blob(blob, bloblen); | |
1192 | if (key == NULL) | |
1588c277 | 1193 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1194 | |
1195 | switch (key_blobtype) { | |
1196 | case MM_USERKEY: | |
1197 | valid_data = monitor_valid_userblob(data, datalen); | |
1198 | break; | |
1199 | case MM_HOSTKEY: | |
1200 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1201 | hostbased_cuser, hostbased_chost); | |
1202 | break; | |
1203 | default: | |
1204 | valid_data = 0; | |
1205 | break; | |
1206 | } | |
1207 | if (!valid_data) | |
1588c277 | 1208 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1209 | |
1210 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1211 | debug3("%s: key %p signature %s", | |
1588c277 | 1212 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1213 | |
1214 | key_free(key); | |
1215 | xfree(blob); | |
1216 | xfree(signature); | |
1217 | xfree(data); | |
1218 | ||
d17ef027 | 1219 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1220 | ||
1853d1ef | 1221 | monitor_reset_key_state(); |
1222 | ||
1223 | buffer_clear(m); | |
1224 | buffer_put_int(m, verified); | |
ca75d7de | 1225 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1226 | |
1853d1ef | 1227 | return (verified); |
1228 | } | |
1229 | ||
1230 | static void | |
1231 | mm_record_login(Session *s, struct passwd *pw) | |
1232 | { | |
1233 | socklen_t fromlen; | |
1234 | struct sockaddr_storage from; | |
1235 | ||
1236 | /* | |
1237 | * Get IP address of client. If the connection is not a socket, let | |
1238 | * the address be 0.0.0.0. | |
1239 | */ | |
1240 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1241 | fromlen = sizeof(from); |
1853d1ef | 1242 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1243 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1244 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1245 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1246 | cleanup_exit(255); |
1853d1ef | 1247 | } |
1248 | } | |
1249 | /* Record that there was a login on that tty from the remote host. */ | |
1250 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1251 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1252 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1253 | } |
1254 | ||
1255 | static void | |
1256 | mm_session_close(Session *s) | |
1257 | { | |
b9ed513a | 1258 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1259 | if (s->ttyfd != -1) { |
1588c277 | 1260 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1261 | session_pty_cleanup2(s); |
1262 | } | |
1263 | s->used = 0; | |
1264 | } | |
1265 | ||
1266 | int | |
ca75d7de | 1267 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1268 | { |
b5a28cbc | 1269 | extern struct monitor *pmonitor; |
1853d1ef | 1270 | Session *s; |
1271 | int res, fd0; | |
1272 | ||
1588c277 | 1273 | debug3("%s entering", __func__); |
1853d1ef | 1274 | |
1275 | buffer_clear(m); | |
1276 | s = session_new(); | |
1277 | if (s == NULL) | |
1278 | goto error; | |
1279 | s->authctxt = authctxt; | |
1280 | s->pw = authctxt->pw; | |
b5a28cbc | 1281 | s->pid = pmonitor->m_pid; |
1853d1ef | 1282 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1283 | if (res == 0) | |
1284 | goto error; | |
1853d1ef | 1285 | pty_setowner(authctxt->pw, s->tty); |
1286 | ||
1287 | buffer_put_int(m, 1); | |
1288 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1289 | |
1290 | /* We need to trick ttyslot */ | |
1291 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1292 | fatal("%s: dup2", __func__); |
1853d1ef | 1293 | |
1294 | mm_record_login(s, authctxt->pw); | |
1295 | ||
1296 | /* Now we can close the file descriptor again */ | |
1297 | close(0); | |
1298 | ||
be2ca0c9 | 1299 | /* send messages generated by record_login */ |
1300 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1301 | buffer_clear(&loginmsg); | |
1302 | ||
1303 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1304 | ||
1305 | mm_send_fd(sock, s->ptyfd); | |
1306 | mm_send_fd(sock, s->ttyfd); | |
1307 | ||
1853d1ef | 1308 | /* make sure nothing uses fd 0 */ |
1309 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1310 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1311 | if (fd0 != 0) |
1588c277 | 1312 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1313 | |
1314 | /* slave is not needed */ | |
1315 | close(s->ttyfd); | |
1316 | s->ttyfd = s->ptyfd; | |
1317 | /* no need to dup() because nobody closes ptyfd */ | |
1318 | s->ptymaster = s->ptyfd; | |
1319 | ||
1588c277 | 1320 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1321 | |
1322 | return (0); | |
1323 | ||
1324 | error: | |
1325 | if (s != NULL) | |
1326 | mm_session_close(s); | |
1327 | buffer_put_int(m, 0); | |
ca75d7de | 1328 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1329 | return (0); |
1330 | } | |
1331 | ||
1332 | int | |
ca75d7de | 1333 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1334 | { |
1335 | Session *s; | |
1336 | char *tty; | |
1337 | ||
1588c277 | 1338 | debug3("%s entering", __func__); |
1853d1ef | 1339 | |
1340 | tty = buffer_get_string(m, NULL); | |
1341 | if ((s = session_by_tty(tty)) != NULL) | |
1342 | mm_session_close(s); | |
1343 | buffer_clear(m); | |
1344 | xfree(tty); | |
1345 | return (0); | |
1346 | } | |
1347 | ||
1348 | int | |
ca75d7de | 1349 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1350 | { |
1351 | BIGNUM *p; | |
1352 | int rsafail; | |
1353 | ||
1354 | /* Turn off permissions */ | |
75cccc2c | 1355 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1356 | |
1357 | if ((p = BN_new()) == NULL) | |
1588c277 | 1358 | fatal("%s: BN_new", __func__); |
1853d1ef | 1359 | |
1360 | buffer_get_bignum2(m, p); | |
1361 | ||
1362 | rsafail = ssh1_session_key(p); | |
1363 | ||
1364 | buffer_clear(m); | |
1365 | buffer_put_int(m, rsafail); | |
1366 | buffer_put_bignum2(m, p); | |
1367 | ||
1368 | BN_clear_free(p); | |
1369 | ||
ca75d7de | 1370 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1371 | |
1372 | /* Turn on permissions for sessid passing */ | |
1373 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1374 | ||
1375 | return (0); | |
1376 | } | |
1377 | ||
1378 | int | |
ca75d7de | 1379 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1380 | { |
1381 | int i; | |
1382 | ||
1588c277 | 1383 | debug3("%s entering", __func__); |
1853d1ef | 1384 | |
1385 | if (buffer_len(m) != 16) | |
1588c277 | 1386 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1387 | for (i = 0; i < 16; i++) |
1388 | session_id[i] = buffer_get_char(m); | |
1389 | ||
1390 | /* Turn on permissions for getpwnam */ | |
1391 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1392 | ||
1393 | return (0); | |
1394 | } | |
1395 | ||
1396 | int | |
ca75d7de | 1397 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1398 | { |
1399 | BIGNUM *client_n; | |
1400 | Key *key = NULL; | |
1401 | u_char *blob = NULL; | |
1402 | u_int blen = 0; | |
1403 | int allowed = 0; | |
1404 | ||
1588c277 | 1405 | debug3("%s entering", __func__); |
1853d1ef | 1406 | |
c023a130 | 1407 | auth_method = "rsa"; |
aa586f8e | 1408 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1409 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1410 | fatal("%s: BN_new", __func__); |
1853d1ef | 1411 | buffer_get_bignum2(m, client_n); |
1412 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1413 | BN_clear_free(client_n); | |
1414 | } | |
1415 | buffer_clear(m); | |
1416 | buffer_put_int(m, allowed); | |
92e15201 | 1417 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1418 | |
1419 | /* clear temporarily storage (used by generate challenge) */ | |
1420 | monitor_reset_key_state(); | |
1421 | ||
1422 | if (allowed && key != NULL) { | |
1423 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1424 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1425 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1426 | buffer_put_string(m, blob, blen); |
1427 | ||
1428 | /* Save temporarily for comparison in verify */ | |
1429 | key_blob = blob; | |
1430 | key_bloblen = blen; | |
1431 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1432 | } |
3e2f2431 | 1433 | if (key != NULL) |
1434 | key_free(key); | |
1853d1ef | 1435 | |
1436 | mm_append_debug(m); | |
1437 | ||
ca75d7de | 1438 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1439 | |
1440 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1441 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1442 | return (0); | |
1443 | } | |
1444 | ||
1445 | int | |
ca75d7de | 1446 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1447 | { |
1448 | Key *key = NULL; | |
1449 | u_char *blob; | |
1450 | u_int blen; | |
1451 | ||
1588c277 | 1452 | debug3("%s entering", __func__); |
1853d1ef | 1453 | |
1454 | if (!authctxt->valid) | |
1588c277 | 1455 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1456 | blob = buffer_get_string(m, &blen); |
1457 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1458 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1459 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1460 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1461 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1462 | fatal("%s: received bad key", __func__); |
1853d1ef | 1463 | |
1464 | if (ssh1_challenge) | |
1465 | BN_clear_free(ssh1_challenge); | |
1466 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1467 | ||
1468 | buffer_clear(m); | |
1469 | buffer_put_bignum2(m, ssh1_challenge); | |
1470 | ||
1588c277 | 1471 | debug3("%s sending reply", __func__); |
ca75d7de | 1472 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1473 | |
1474 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1475 | |
1476 | xfree(blob); | |
1477 | key_free(key); | |
1853d1ef | 1478 | return (0); |
1479 | } | |
1480 | ||
1481 | int | |
ca75d7de | 1482 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1483 | { |
1484 | Key *key = NULL; | |
1485 | u_char *blob, *response; | |
1486 | u_int blen, len; | |
1487 | int success; | |
1488 | ||
1588c277 | 1489 | debug3("%s entering", __func__); |
1853d1ef | 1490 | |
1491 | if (!authctxt->valid) | |
1588c277 | 1492 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1493 | if (ssh1_challenge == NULL) |
1588c277 | 1494 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1495 | |
1496 | blob = buffer_get_string(m, &blen); | |
1497 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1498 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1499 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1500 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1501 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1502 | fatal("%s: received bad key", __func__); |
1853d1ef | 1503 | response = buffer_get_string(m, &len); |
1504 | if (len != 16) | |
1588c277 | 1505 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1506 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1507 | ||
3e2f2431 | 1508 | xfree(blob); |
1853d1ef | 1509 | key_free(key); |
1510 | xfree(response); | |
1511 | ||
1512 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1513 | ||
1514 | /* reset state */ | |
1515 | BN_clear_free(ssh1_challenge); | |
1516 | ssh1_challenge = NULL; | |
1517 | monitor_reset_key_state(); | |
1518 | ||
1519 | buffer_clear(m); | |
1520 | buffer_put_int(m, success); | |
ca75d7de | 1521 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1522 | |
1523 | return (success); | |
1524 | } | |
1525 | ||
1526 | int | |
ca75d7de | 1527 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1528 | { |
b5a28cbc | 1529 | extern struct monitor *pmonitor; |
1853d1ef | 1530 | int res, status; |
1531 | ||
1588c277 | 1532 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1533 | |
1534 | /* The child is terminating */ | |
1535 | session_destroy_all(&mm_session_close); | |
1536 | ||
b5a28cbc | 1537 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1538 | if (errno != EINTR) |
1539 | exit(1); | |
1853d1ef | 1540 | |
1541 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1542 | ||
1543 | /* Terminate process */ | |
f6be21a0 | 1544 | exit(res); |
1853d1ef | 1545 | } |
1546 | ||
6039eeef | 1547 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1548 | /* Report that an audit event occurred */ |
1549 | int | |
1550 | mm_answer_audit_event(int socket, Buffer *m) | |
1551 | { | |
1552 | ssh_audit_event_t event; | |
1553 | ||
1554 | debug3("%s entering", __func__); | |
1555 | ||
1556 | event = buffer_get_int(m); | |
c00e4d75 | 1557 | switch(event) { |
6039eeef | 1558 | case SSH_AUTH_FAIL_PUBKEY: |
1559 | case SSH_AUTH_FAIL_HOSTBASED: | |
1560 | case SSH_AUTH_FAIL_GSSAPI: | |
1561 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1562 | case SSH_LOGIN_ROOT_DENIED: | |
1563 | case SSH_CONNECTION_CLOSE: | |
1564 | case SSH_INVALID_USER: | |
c00e4d75 | 1565 | audit_event(event); |
1566 | break; | |
1567 | default: | |
1568 | fatal("Audit event type %d not permitted", event); | |
1569 | } | |
1570 | ||
1571 | return (0); | |
1572 | } | |
1573 | ||
1574 | int | |
1575 | mm_answer_audit_command(int socket, Buffer *m) | |
1576 | { | |
1577 | u_int len; | |
1578 | char *cmd; | |
1579 | ||
1580 | debug3("%s entering", __func__); | |
1581 | cmd = buffer_get_string(m, &len); | |
1582 | /* sanity check command, if so how? */ | |
1583 | audit_run_command(cmd); | |
1584 | xfree(cmd); | |
c00e4d75 | 1585 | return (0); |
1586 | } | |
6039eeef | 1587 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1588 | |
1853d1ef | 1589 | void |
b5a28cbc | 1590 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1591 | { |
1592 | if (compat20) { | |
1593 | set_newkeys(MODE_IN); | |
1594 | set_newkeys(MODE_OUT); | |
1595 | } else { | |
1853d1ef | 1596 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1597 | packet_set_encryption_key(child_state.ssh1key, |
1598 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1599 | xfree(child_state.ssh1key); | |
1853d1ef | 1600 | } |
1601 | ||
9459414c | 1602 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1603 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1604 | xfree(child_state.keyout); | |
1605 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1606 | xfree(child_state.keyin); | |
1607 | ||
1608 | if (!compat20) { | |
1609 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1610 | xfree(child_state.ivout); | |
1611 | packet_set_iv(MODE_IN, child_state.ivin); | |
1612 | xfree(child_state.ivin); | |
1613 | } | |
1614 | ||
1615 | memcpy(&incoming_stream, &child_state.incoming, | |
1616 | sizeof(incoming_stream)); | |
1617 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1618 | sizeof(outgoing_stream)); | |
1619 | ||
1620 | /* Update with new address */ | |
0496cf34 | 1621 | if (options.compression) |
1622 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1623 | |
1624 | /* Network I/O buffers */ | |
1625 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1626 | buffer_clear(&input); | |
1627 | buffer_append(&input, child_state.input, child_state.ilen); | |
1628 | memset(child_state.input, 0, child_state.ilen); | |
1629 | xfree(child_state.input); | |
1630 | ||
1631 | buffer_clear(&output); | |
1632 | buffer_append(&output, child_state.output, child_state.olen); | |
1633 | memset(child_state.output, 0, child_state.olen); | |
1634 | xfree(child_state.output); | |
1635 | } | |
1636 | ||
1637 | static Kex * | |
1638 | mm_get_kex(Buffer *m) | |
1639 | { | |
1640 | Kex *kex; | |
1641 | void *blob; | |
1642 | u_int bloblen; | |
1643 | ||
52e3daed | 1644 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1645 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1646 | if ((session_id2 == NULL) || |
1647 | (kex->session_id_len != session_id2_len) || | |
1648 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1649 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1650 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1651 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1652 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1653 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1654 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1655 | kex->server = 1; |
1656 | kex->hostkey_type = buffer_get_int(m); | |
1657 | kex->kex_type = buffer_get_int(m); | |
1658 | blob = buffer_get_string(m, &bloblen); | |
1659 | buffer_init(&kex->my); | |
1660 | buffer_append(&kex->my, blob, bloblen); | |
1661 | xfree(blob); | |
1662 | blob = buffer_get_string(m, &bloblen); | |
1663 | buffer_init(&kex->peer); | |
1664 | buffer_append(&kex->peer, blob, bloblen); | |
1665 | xfree(blob); | |
1666 | kex->done = 1; | |
1667 | kex->flags = buffer_get_int(m); | |
1668 | kex->client_version_string = buffer_get_string(m, NULL); | |
1669 | kex->server_version_string = buffer_get_string(m, NULL); | |
1670 | kex->load_host_key=&get_hostkey_by_type; | |
1671 | kex->host_key_index=&get_hostkey_index; | |
1672 | ||
1673 | return (kex); | |
1674 | } | |
1675 | ||
1676 | /* This function requries careful sanity checking */ | |
1677 | ||
1678 | void | |
b5a28cbc | 1679 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1680 | { |
1681 | Buffer m; | |
1682 | u_char *blob, *p; | |
1683 | u_int bloblen, plen; | |
ffd7b36b | 1684 | u_int32_t seqnr, packets; |
1685 | u_int64_t blocks; | |
1853d1ef | 1686 | |
1588c277 | 1687 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1688 | |
1689 | buffer_init(&m); | |
b5a28cbc | 1690 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1691 | if (!compat20) { |
1692 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1693 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1694 | child_state.ssh1key = buffer_get_string(&m, |
1695 | &child_state.ssh1keylen); | |
1853d1ef | 1696 | child_state.ivout = buffer_get_string(&m, |
1697 | &child_state.ivoutlen); | |
1698 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1699 | goto skip; | |
1700 | } else { | |
1701 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1702 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1703 | } |
1704 | ||
1705 | blob = buffer_get_string(&m, &bloblen); | |
1706 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1707 | xfree(blob); | |
1708 | ||
1588c277 | 1709 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1710 | blob = buffer_get_string(&m, &bloblen); |
1711 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1712 | xfree(blob); | |
1713 | ||
1714 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1715 | seqnr = buffer_get_int(&m); |
1716 | blocks = buffer_get_int64(&m); | |
1717 | packets = buffer_get_int(&m); | |
1718 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1719 | seqnr = buffer_get_int(&m); | |
1720 | blocks = buffer_get_int64(&m); | |
1721 | packets = buffer_get_int(&m); | |
1722 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1723 | |
1724 | skip: | |
1725 | /* Get the key context */ | |
1726 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1727 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1728 | ||
1588c277 | 1729 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1730 | /* Get compression state */ |
1731 | p = buffer_get_string(&m, &plen); | |
1732 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1733 | fatal("%s: bad request size", __func__); |
1853d1ef | 1734 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1735 | xfree(p); | |
1736 | ||
1737 | p = buffer_get_string(&m, &plen); | |
1738 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1739 | fatal("%s: bad request size", __func__); |
1853d1ef | 1740 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1741 | xfree(p); | |
1742 | ||
1743 | /* Network I/O buffers */ | |
1588c277 | 1744 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1745 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1746 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1747 | ||
1748 | buffer_free(&m); | |
1749 | } | |
1750 | ||
1751 | ||
1752 | /* Allocation functions for zlib */ | |
1753 | void * | |
1754 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1755 | { | |
39e71188 | 1756 | size_t len = (size_t) size * ncount; |
1853d1ef | 1757 | void *address; |
1758 | ||
b85698ab | 1759 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1760 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1761 | ||
1762 | address = mm_malloc(mm, len); | |
1853d1ef | 1763 | |
1764 | return (address); | |
1765 | } | |
1766 | ||
1767 | void | |
1768 | mm_zfree(struct mm_master *mm, void *address) | |
1769 | { | |
1770 | mm_free(mm, address); | |
1771 | } | |
1772 | ||
1773 | void | |
1774 | mm_init_compression(struct mm_master *mm) | |
1775 | { | |
1776 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1777 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1778 | outgoing_stream.opaque = mm; | |
1779 | ||
1780 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1781 | incoming_stream.zfree = (free_func)mm_zfree; | |
1782 | incoming_stream.opaque = mm; | |
1783 | } | |
1784 | ||
1785 | /* XXX */ | |
1786 | ||
1787 | #define FD_CLOSEONEXEC(x) do { \ | |
1788 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1789 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1790 | } while (0) | |
1791 | ||
1792 | static void | |
1793 | monitor_socketpair(int *pair) | |
1794 | { | |
f1af2dbf | 1795 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1796 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1797 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1798 | #else |
1799 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1800 | __func__); |
f1af2dbf | 1801 | #endif |
1853d1ef | 1802 | FD_CLOSEONEXEC(pair[0]); |
1803 | FD_CLOSEONEXEC(pair[1]); | |
1804 | } | |
1805 | ||
1806 | #define MM_MEMSIZE 65536 | |
1807 | ||
1808 | struct monitor * | |
1809 | monitor_init(void) | |
1810 | { | |
1811 | struct monitor *mon; | |
1812 | int pair[2]; | |
1813 | ||
52e3daed | 1814 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1815 | |
1816 | monitor_socketpair(pair); | |
1817 | ||
1818 | mon->m_recvfd = pair[0]; | |
1819 | mon->m_sendfd = pair[1]; | |
1820 | ||
1821 | /* Used to share zlib space across processes */ | |
0496cf34 | 1822 | if (options.compression) { |
1823 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1824 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1825 | |
0496cf34 | 1826 | /* Compression needs to share state across borders */ |
1827 | mm_init_compression(mon->m_zlib); | |
1828 | } | |
1853d1ef | 1829 | |
1830 | return mon; | |
1831 | } | |
1832 | ||
1833 | void | |
1834 | monitor_reinit(struct monitor *mon) | |
1835 | { | |
1836 | int pair[2]; | |
1837 | ||
1838 | monitor_socketpair(pair); | |
1839 | ||
1840 | mon->m_recvfd = pair[0]; | |
1841 | mon->m_sendfd = pair[1]; | |
1842 | } | |
7364bd04 | 1843 | |
1844 | #ifdef GSSAPI | |
1845 | int | |
ca75d7de | 1846 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1847 | { |
ca75d7de | 1848 | gss_OID_desc goid; |
7364bd04 | 1849 | OM_uint32 major; |
1850 | u_int len; | |
1851 | ||
ca75d7de | 1852 | goid.elements = buffer_get_string(m, &len); |
1853 | goid.length = len; | |
7364bd04 | 1854 | |
ca75d7de | 1855 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1856 | |
ca75d7de | 1857 | xfree(goid.elements); |
7364bd04 | 1858 | |
1859 | buffer_clear(m); | |
1860 | buffer_put_int(m, major); | |
1861 | ||
8442cc66 | 1862 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1863 | |
1864 | /* Now we have a context, enable the step */ | |
1865 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1866 | ||
1867 | return (0); | |
1868 | } | |
1869 | ||
1870 | int | |
ca75d7de | 1871 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1872 | { |
1873 | gss_buffer_desc in; | |
1874 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1875 | OM_uint32 major, minor; |
7364bd04 | 1876 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1877 | u_int len; |
7364bd04 | 1878 | |
f99e1ca4 | 1879 | in.value = buffer_get_string(m, &len); |
1880 | in.length = len; | |
7364bd04 | 1881 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1882 | xfree(in.value); | |
1883 | ||
1884 | buffer_clear(m); | |
1885 | buffer_put_int(m, major); | |
1886 | buffer_put_string(m, out.value, out.length); | |
1887 | buffer_put_int(m, flags); | |
ca75d7de | 1888 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1889 | |
1890 | gss_release_buffer(&minor, &out); | |
1891 | ||
8442cc66 | 1892 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1893 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1894 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1895 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1896 | } |
1897 | return (0); | |
1898 | } | |
1899 | ||
0789992b | 1900 | int |
ca75d7de | 1901 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1902 | { |
1903 | gss_buffer_desc gssbuf, mic; | |
1904 | OM_uint32 ret; | |
1905 | u_int len; | |
b6453d99 | 1906 | |
0789992b | 1907 | gssbuf.value = buffer_get_string(m, &len); |
1908 | gssbuf.length = len; | |
1909 | mic.value = buffer_get_string(m, &len); | |
1910 | mic.length = len; | |
b6453d99 | 1911 | |
0789992b | 1912 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1913 | |
0789992b | 1914 | xfree(gssbuf.value); |
1915 | xfree(mic.value); | |
b6453d99 | 1916 | |
0789992b | 1917 | buffer_clear(m); |
1918 | buffer_put_int(m, ret); | |
b6453d99 | 1919 | |
ca75d7de | 1920 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1921 | |
0789992b | 1922 | if (!GSS_ERROR(ret)) |
1923 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1924 | |
0789992b | 1925 | return (0); |
1926 | } | |
1927 | ||
7364bd04 | 1928 | int |
ca75d7de | 1929 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1930 | { |
1931 | int authenticated; | |
1932 | ||
1933 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1934 | ||
1935 | buffer_clear(m); | |
1936 | buffer_put_int(m, authenticated); | |
1937 | ||
1938 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1939 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1940 | |
8442cc66 | 1941 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1942 | |
1943 | /* Monitor loop will terminate if authenticated */ | |
1944 | return (authenticated); | |
1945 | } | |
1946 | #endif /* GSSAPI */ |