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536c14e8 | 1 | /* $OpenBSD: monitor.c,v 1.83 2006/07/26 02:35:17 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> |
00146caa | 42 | #include <string.h> |
1853d1ef | 43 | |
44 | #ifdef SKEY | |
45 | #include <skey.h> | |
46 | #endif | |
47 | ||
a75f5360 | 48 | #include <openssl/dh.h> |
49 | ||
1853d1ef | 50 | #include "ssh.h" |
51 | #include "auth.h" | |
52 | #include "kex.h" | |
53 | #include "dh.h" | |
a655c012 | 54 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
55 | #undef TARGET_OS_MAC | |
9b08c23f | 56 | #include "zlib.h" |
a655c012 | 57 | #define TARGET_OS_MAC 1 |
58 | #else | |
59 | #include "zlib.h" | |
60 | #endif | |
1853d1ef | 61 | #include "packet.h" |
62 | #include "auth-options.h" | |
63 | #include "sshpty.h" | |
64 | #include "channels.h" | |
65 | #include "session.h" | |
66 | #include "sshlogin.h" | |
67 | #include "canohost.h" | |
68 | #include "log.h" | |
69 | #include "servconf.h" | |
70 | #include "monitor.h" | |
71 | #include "monitor_mm.h" | |
72 | #include "monitor_wrap.h" | |
73 | #include "monitor_fdpass.h" | |
74 | #include "xmalloc.h" | |
75 | #include "misc.h" | |
76 | #include "buffer.h" | |
77 | #include "bufaux.h" | |
78 | #include "compat.h" | |
79 | #include "ssh2.h" | |
1853d1ef | 80 | |
7364bd04 | 81 | #ifdef GSSAPI |
82 | #include "ssh-gss.h" | |
83 | static Gssctxt *gsscontext = NULL; | |
84 | #endif | |
85 | ||
1853d1ef | 86 | /* Imports */ |
87 | extern ServerOptions options; | |
88 | extern u_int utmp_len; | |
89 | extern Newkeys *current_keys[]; | |
90 | extern z_stream incoming_stream; | |
91 | extern z_stream outgoing_stream; | |
92 | extern u_char session_id[]; | |
93 | extern Buffer input, output; | |
94 | extern Buffer auth_debug; | |
95 | extern int auth_debug_init; | |
be2ca0c9 | 96 | extern Buffer loginmsg; |
1853d1ef | 97 | |
98 | /* State exported from the child */ | |
99 | ||
100 | struct { | |
101 | z_stream incoming; | |
102 | z_stream outgoing; | |
103 | u_char *keyin; | |
104 | u_int keyinlen; | |
105 | u_char *keyout; | |
106 | u_int keyoutlen; | |
107 | u_char *ivin; | |
108 | u_int ivinlen; | |
109 | u_char *ivout; | |
110 | u_int ivoutlen; | |
9459414c | 111 | u_char *ssh1key; |
112 | u_int ssh1keylen; | |
1853d1ef | 113 | int ssh1cipher; |
114 | int ssh1protoflags; | |
115 | u_char *input; | |
116 | u_int ilen; | |
117 | u_char *output; | |
118 | u_int olen; | |
119 | } child_state; | |
120 | ||
b8e04133 | 121 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 122 | |
123 | int mm_answer_moduli(int, Buffer *); | |
124 | int mm_answer_sign(int, Buffer *); | |
125 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 126 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 127 | int mm_answer_authserv(int, Buffer *); |
128 | int mm_answer_authpassword(int, Buffer *); | |
129 | int mm_answer_bsdauthquery(int, Buffer *); | |
130 | int mm_answer_bsdauthrespond(int, Buffer *); | |
131 | int mm_answer_skeyquery(int, Buffer *); | |
132 | int mm_answer_skeyrespond(int, Buffer *); | |
133 | int mm_answer_keyallowed(int, Buffer *); | |
134 | int mm_answer_keyverify(int, Buffer *); | |
135 | int mm_answer_pty(int, Buffer *); | |
136 | int mm_answer_pty_cleanup(int, Buffer *); | |
137 | int mm_answer_term(int, Buffer *); | |
138 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
139 | int mm_answer_rsa_challenge(int, Buffer *); | |
140 | int mm_answer_rsa_response(int, Buffer *); | |
141 | int mm_answer_sesskey(int, Buffer *); | |
142 | int mm_answer_sessid(int, Buffer *); | |
143 | ||
ad200abb | 144 | #ifdef USE_PAM |
145 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 146 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 147 | int mm_answer_pam_init_ctx(int, Buffer *); |
148 | int mm_answer_pam_query(int, Buffer *); | |
149 | int mm_answer_pam_respond(int, Buffer *); | |
150 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 151 | #endif |
152 | ||
7364bd04 | 153 | #ifdef GSSAPI |
154 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
155 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
156 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 157 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 158 | #endif |
696f6bef | 159 | |
6039eeef | 160 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 161 | int mm_answer_audit_event(int, Buffer *); |
162 | int mm_answer_audit_command(int, Buffer *); | |
163 | #endif | |
164 | ||
1853d1ef | 165 | static Authctxt *authctxt; |
166 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
167 | ||
168 | /* local state for key verify */ | |
169 | static u_char *key_blob = NULL; | |
170 | static u_int key_bloblen = 0; | |
171 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 172 | static char *hostbased_cuser = NULL; |
173 | static char *hostbased_chost = NULL; | |
1853d1ef | 174 | static char *auth_method = "unknown"; |
a27002e5 | 175 | static u_int session_id2_len = 0; |
521d606b | 176 | static u_char *session_id2 = NULL; |
3a39206f | 177 | static pid_t monitor_child_pid; |
1853d1ef | 178 | |
179 | struct mon_table { | |
180 | enum monitor_reqtype type; | |
181 | int flags; | |
182 | int (*f)(int, Buffer *); | |
183 | }; | |
184 | ||
185 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
186 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
187 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 188 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 189 | |
190 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
191 | ||
192 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
193 | ||
194 | struct mon_table mon_dispatch_proto20[] = { | |
195 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
196 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
197 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
198 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 199 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 200 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 201 | #ifdef USE_PAM |
202 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 203 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 204 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
205 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
206 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
207 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 208 | #endif |
6039eeef | 209 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 210 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 211 | #endif |
1853d1ef | 212 | #ifdef BSD_AUTH |
213 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 214 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 215 | #endif |
216 | #ifdef SKEY | |
217 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
218 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
219 | #endif | |
220 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
221 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 222 | #ifdef GSSAPI |
223 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
224 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
225 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 226 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 227 | #endif |
1853d1ef | 228 | {0, 0, NULL} |
229 | }; | |
230 | ||
231 | struct mon_table mon_dispatch_postauth20[] = { | |
232 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
233 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
234 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
235 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
236 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 237 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 238 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
239 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
240 | #endif | |
1853d1ef | 241 | {0, 0, NULL} |
242 | }; | |
243 | ||
244 | struct mon_table mon_dispatch_proto15[] = { | |
245 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
246 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
247 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
248 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 249 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
250 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 251 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
252 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
253 | #ifdef BSD_AUTH | |
254 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 255 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 256 | #endif |
257 | #ifdef SKEY | |
258 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
259 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 260 | #endif |
261 | #ifdef USE_PAM | |
262 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 263 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 264 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
265 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
266 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
267 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 268 | #endif |
6039eeef | 269 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 270 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 271 | #endif |
272 | {0, 0, NULL} | |
273 | }; | |
274 | ||
275 | struct mon_table mon_dispatch_postauth15[] = { | |
276 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
277 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
278 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 279 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 280 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 281 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 282 | #endif |
1853d1ef | 283 | {0, 0, NULL} |
284 | }; | |
285 | ||
286 | struct mon_table *mon_dispatch; | |
287 | ||
288 | /* Specifies if a certain message is allowed at the moment */ | |
289 | ||
290 | static void | |
291 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
292 | { | |
293 | while (ent->f != NULL) { | |
294 | if (ent->type == type) { | |
295 | ent->flags &= ~MON_PERMIT; | |
296 | ent->flags |= permit ? MON_PERMIT : 0; | |
297 | return; | |
298 | } | |
299 | ent++; | |
300 | } | |
301 | } | |
302 | ||
303 | static void | |
304 | monitor_permit_authentications(int permit) | |
305 | { | |
306 | struct mon_table *ent = mon_dispatch; | |
307 | ||
308 | while (ent->f != NULL) { | |
309 | if (ent->flags & MON_AUTH) { | |
310 | ent->flags &= ~MON_PERMIT; | |
311 | ent->flags |= permit ? MON_PERMIT : 0; | |
312 | } | |
313 | ent++; | |
314 | } | |
315 | } | |
316 | ||
2362db19 | 317 | void |
318 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 319 | { |
320 | struct mon_table *ent; | |
321 | int authenticated = 0; | |
322 | ||
323 | debug3("preauth child monitor started"); | |
324 | ||
2362db19 | 325 | authctxt = _authctxt; |
326 | memset(authctxt, 0, sizeof(*authctxt)); | |
327 | ||
e05df884 | 328 | authctxt->loginmsg = &loginmsg; |
329 | ||
1853d1ef | 330 | if (compat20) { |
331 | mon_dispatch = mon_dispatch_proto20; | |
332 | ||
333 | /* Permit requests for moduli and signatures */ | |
334 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
335 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
336 | } else { | |
337 | mon_dispatch = mon_dispatch_proto15; | |
338 | ||
339 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
340 | } | |
341 | ||
1853d1ef | 342 | /* The first few requests do not require asynchronous access */ |
343 | while (!authenticated) { | |
c023a130 | 344 | auth_method = "unknown"; |
b5a28cbc | 345 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 346 | if (authenticated) { |
347 | if (!(ent->flags & MON_AUTHDECIDE)) | |
348 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 349 | __func__, ent->type); |
1853d1ef | 350 | if (authctxt->pw->pw_uid == 0 && |
351 | !auth_root_allowed(auth_method)) | |
352 | authenticated = 0; | |
5b9e2464 | 353 | #ifdef USE_PAM |
354 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 355 | if (options.use_pam && authenticated) { |
5b9e2464 | 356 | Buffer m; |
357 | ||
358 | buffer_init(&m); | |
aff51935 | 359 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 360 | MONITOR_REQ_PAM_ACCOUNT, &m); |
361 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
362 | buffer_free(&m); | |
363 | } | |
364 | #endif | |
1853d1ef | 365 | } |
366 | ||
c023a130 | 367 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 368 | auth_log(authctxt, authenticated, auth_method, |
369 | compat20 ? " ssh2" : ""); | |
370 | if (!authenticated) | |
371 | authctxt->failures++; | |
372 | } | |
373 | } | |
374 | ||
375 | if (!authctxt->valid) | |
1588c277 | 376 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 377 | if (strcmp(auth_method, "unknown") == 0) |
378 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 379 | |
380 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 381 | __func__, authctxt->user); |
1853d1ef | 382 | |
b5a28cbc | 383 | mm_get_keystate(pmonitor); |
1853d1ef | 384 | } |
385 | ||
3a39206f | 386 | static void |
387 | monitor_set_child_handler(pid_t pid) | |
388 | { | |
389 | monitor_child_pid = pid; | |
390 | } | |
391 | ||
392 | static void | |
ca75d7de | 393 | monitor_child_handler(int sig) |
3a39206f | 394 | { |
ca75d7de | 395 | kill(monitor_child_pid, sig); |
3a39206f | 396 | } |
397 | ||
1853d1ef | 398 | void |
b5a28cbc | 399 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 400 | { |
3a39206f | 401 | monitor_set_child_handler(pmonitor->m_pid); |
402 | signal(SIGHUP, &monitor_child_handler); | |
403 | signal(SIGTERM, &monitor_child_handler); | |
404 | ||
1853d1ef | 405 | if (compat20) { |
406 | mon_dispatch = mon_dispatch_postauth20; | |
407 | ||
408 | /* Permit requests for moduli and signatures */ | |
409 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
410 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
411 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 412 | } else { |
413 | mon_dispatch = mon_dispatch_postauth15; | |
414 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
415 | } | |
416 | if (!no_pty_flag) { | |
417 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
418 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
419 | } | |
420 | ||
421 | for (;;) | |
b5a28cbc | 422 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 423 | } |
424 | ||
425 | void | |
b5a28cbc | 426 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 427 | { |
0496cf34 | 428 | if (options.compression) { |
429 | /* The member allocation is not visible, so sync it */ | |
430 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
431 | } | |
1853d1ef | 432 | } |
433 | ||
434 | int | |
b5a28cbc | 435 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 436 | struct mon_table **pent) |
437 | { | |
438 | Buffer m; | |
439 | int ret; | |
440 | u_char type; | |
441 | ||
442 | buffer_init(&m); | |
443 | ||
b5a28cbc | 444 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 445 | type = buffer_get_char(&m); |
446 | ||
1588c277 | 447 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 448 | |
449 | while (ent->f != NULL) { | |
450 | if (ent->type == type) | |
451 | break; | |
452 | ent++; | |
453 | } | |
454 | ||
455 | if (ent->f != NULL) { | |
456 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 457 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 458 | type); |
b5a28cbc | 459 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 460 | buffer_free(&m); |
461 | ||
462 | /* The child may use this request only once, disable it */ | |
463 | if (ent->flags & MON_ONCE) { | |
1588c277 | 464 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 465 | type); |
466 | ent->flags &= ~MON_PERMIT; | |
467 | } | |
468 | ||
469 | if (pent != NULL) | |
470 | *pent = ent; | |
471 | ||
472 | return ret; | |
473 | } | |
474 | ||
1588c277 | 475 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 476 | |
477 | /* NOTREACHED */ | |
478 | return (-1); | |
479 | } | |
480 | ||
481 | /* allowed key state */ | |
482 | static int | |
483 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
484 | { | |
485 | /* make sure key is allowed */ | |
486 | if (key_blob == NULL || key_bloblen != bloblen || | |
487 | memcmp(key_blob, blob, key_bloblen)) | |
488 | return (0); | |
489 | return (1); | |
490 | } | |
491 | ||
492 | static void | |
493 | monitor_reset_key_state(void) | |
494 | { | |
495 | /* reset state */ | |
496 | if (key_blob != NULL) | |
497 | xfree(key_blob); | |
498 | if (hostbased_cuser != NULL) | |
499 | xfree(hostbased_cuser); | |
500 | if (hostbased_chost != NULL) | |
501 | xfree(hostbased_chost); | |
502 | key_blob = NULL; | |
503 | key_bloblen = 0; | |
504 | key_blobtype = MM_NOKEY; | |
505 | hostbased_cuser = NULL; | |
506 | hostbased_chost = NULL; | |
507 | } | |
508 | ||
509 | int | |
ca75d7de | 510 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 511 | { |
512 | DH *dh; | |
513 | int min, want, max; | |
514 | ||
515 | min = buffer_get_int(m); | |
516 | want = buffer_get_int(m); | |
517 | max = buffer_get_int(m); | |
518 | ||
519 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 520 | __func__, min, want, max); |
1853d1ef | 521 | /* We need to check here, too, in case the child got corrupted */ |
522 | if (max < min || want < min || max < want) | |
523 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 524 | __func__, min, want, max); |
1853d1ef | 525 | |
526 | buffer_clear(m); | |
527 | ||
528 | dh = choose_dh(min, want, max); | |
529 | if (dh == NULL) { | |
530 | buffer_put_char(m, 0); | |
531 | return (0); | |
532 | } else { | |
533 | /* Send first bignum */ | |
534 | buffer_put_char(m, 1); | |
535 | buffer_put_bignum2(m, dh->p); | |
536 | buffer_put_bignum2(m, dh->g); | |
537 | ||
538 | DH_free(dh); | |
539 | } | |
ca75d7de | 540 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 541 | return (0); |
542 | } | |
543 | ||
544 | int | |
ca75d7de | 545 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 546 | { |
547 | Key *key; | |
548 | u_char *p; | |
549 | u_char *signature; | |
550 | u_int siglen, datlen; | |
551 | int keyid; | |
552 | ||
1588c277 | 553 | debug3("%s", __func__); |
1853d1ef | 554 | |
555 | keyid = buffer_get_int(m); | |
556 | p = buffer_get_string(m, &datlen); | |
557 | ||
2ff8003a | 558 | /* |
b4bbf172 | 559 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 560 | * SHA256 (32 byte) hashes |
561 | */ | |
562 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 563 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 564 | |
521d606b | 565 | /* save session id, it will be passed on the first call */ |
566 | if (session_id2_len == 0) { | |
567 | session_id2_len = datlen; | |
568 | session_id2 = xmalloc(session_id2_len); | |
569 | memcpy(session_id2, p, session_id2_len); | |
570 | } | |
571 | ||
1853d1ef | 572 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 573 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 574 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 575 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 576 | |
d1ff09ba | 577 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 578 | |
579 | buffer_clear(m); | |
580 | buffer_put_string(m, signature, siglen); | |
581 | ||
582 | xfree(p); | |
583 | xfree(signature); | |
584 | ||
ca75d7de | 585 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 586 | |
587 | /* Turn on permissions for getpwnam */ | |
588 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
589 | ||
590 | return (0); | |
591 | } | |
592 | ||
593 | /* Retrieves the password entry and also checks if the user is permitted */ | |
594 | ||
595 | int | |
ca75d7de | 596 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 597 | { |
18a8f313 | 598 | char *username; |
1853d1ef | 599 | struct passwd *pwent; |
600 | int allowed = 0; | |
601 | ||
1588c277 | 602 | debug3("%s", __func__); |
1853d1ef | 603 | |
604 | if (authctxt->attempt++ != 0) | |
1588c277 | 605 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 606 | |
18a8f313 | 607 | username = buffer_get_string(m, NULL); |
1853d1ef | 608 | |
18a8f313 | 609 | pwent = getpwnamallow(username); |
1853d1ef | 610 | |
18a8f313 | 611 | authctxt->user = xstrdup(username); |
612 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
613 | xfree(username); | |
1853d1ef | 614 | |
615 | buffer_clear(m); | |
616 | ||
617 | if (pwent == NULL) { | |
618 | buffer_put_char(m, 0); | |
b2a5802b | 619 | authctxt->pw = fakepw(); |
1853d1ef | 620 | goto out; |
621 | } | |
622 | ||
623 | allowed = 1; | |
624 | authctxt->pw = pwent; | |
625 | authctxt->valid = 1; | |
626 | ||
627 | buffer_put_char(m, 1); | |
628 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
629 | buffer_put_cstring(m, pwent->pw_name); | |
630 | buffer_put_cstring(m, "*"); | |
631 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 632 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 633 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 634 | #endif |
1853d1ef | 635 | buffer_put_cstring(m, pwent->pw_dir); |
636 | buffer_put_cstring(m, pwent->pw_shell); | |
637 | ||
638 | out: | |
1588c277 | 639 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 640 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 641 | |
642 | /* For SSHv1 allow authentication now */ | |
643 | if (!compat20) | |
644 | monitor_permit_authentications(1); | |
94a73cdc | 645 | else { |
1853d1ef | 646 | /* Allow service/style information on the auth context */ |
647 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 648 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
649 | } | |
1853d1ef | 650 | |
efe44db6 | 651 | #ifdef USE_PAM |
7fceb20d | 652 | if (options.use_pam) |
653 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 654 | #endif |
6039eeef | 655 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 656 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 657 | #endif |
1853d1ef | 658 | |
659 | return (0); | |
660 | } | |
661 | ||
ca75d7de | 662 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 663 | { |
664 | char *banner; | |
665 | ||
666 | buffer_clear(m); | |
667 | banner = auth2_read_banner(); | |
668 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 669 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 670 | |
671 | if (banner != NULL) | |
30e37ee6 | 672 | xfree(banner); |
94a73cdc | 673 | |
674 | return (0); | |
675 | } | |
676 | ||
1853d1ef | 677 | int |
ca75d7de | 678 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 679 | { |
680 | monitor_permit_authentications(1); | |
681 | ||
682 | authctxt->service = buffer_get_string(m, NULL); | |
683 | authctxt->style = buffer_get_string(m, NULL); | |
684 | debug3("%s: service=%s, style=%s", | |
1588c277 | 685 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 686 | |
687 | if (strlen(authctxt->style) == 0) { | |
688 | xfree(authctxt->style); | |
689 | authctxt->style = NULL; | |
690 | } | |
691 | ||
692 | return (0); | |
693 | } | |
694 | ||
695 | int | |
ca75d7de | 696 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 697 | { |
698 | static int call_count; | |
699 | char *passwd; | |
d341742a | 700 | int authenticated; |
701 | u_int plen; | |
1853d1ef | 702 | |
703 | passwd = buffer_get_string(m, &plen); | |
704 | /* Only authenticate if the context is valid */ | |
aa586f8e | 705 | authenticated = options.password_authentication && |
96d0bf74 | 706 | auth_password(authctxt, passwd); |
1853d1ef | 707 | memset(passwd, 0, strlen(passwd)); |
708 | xfree(passwd); | |
709 | ||
710 | buffer_clear(m); | |
711 | buffer_put_int(m, authenticated); | |
712 | ||
1588c277 | 713 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 714 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 715 | |
716 | call_count++; | |
717 | if (plen == 0 && call_count == 1) | |
718 | auth_method = "none"; | |
719 | else | |
720 | auth_method = "password"; | |
721 | ||
722 | /* Causes monitor loop to terminate if authenticated */ | |
723 | return (authenticated); | |
724 | } | |
725 | ||
726 | #ifdef BSD_AUTH | |
727 | int | |
ca75d7de | 728 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 729 | { |
730 | char *name, *infotxt; | |
731 | u_int numprompts; | |
732 | u_int *echo_on; | |
733 | char **prompts; | |
6d6c25e3 | 734 | u_int success; |
1853d1ef | 735 | |
6d6c25e3 | 736 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
737 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 738 | |
739 | buffer_clear(m); | |
6d6c25e3 | 740 | buffer_put_int(m, success); |
741 | if (success) | |
1853d1ef | 742 | buffer_put_cstring(m, prompts[0]); |
743 | ||
6d6c25e3 | 744 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 745 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 746 | |
6d6c25e3 | 747 | if (success) { |
1853d1ef | 748 | xfree(name); |
749 | xfree(infotxt); | |
750 | xfree(prompts); | |
751 | xfree(echo_on); | |
752 | } | |
753 | ||
754 | return (0); | |
755 | } | |
756 | ||
757 | int | |
ca75d7de | 758 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 759 | { |
760 | char *response; | |
761 | int authok; | |
762 | ||
763 | if (authctxt->as == 0) | |
1588c277 | 764 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 765 | |
766 | response = buffer_get_string(m, NULL); | |
aa586f8e | 767 | authok = options.challenge_response_authentication && |
768 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 769 | authctxt->as = NULL; |
1588c277 | 770 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 771 | xfree(response); |
772 | ||
773 | buffer_clear(m); | |
774 | buffer_put_int(m, authok); | |
775 | ||
1588c277 | 776 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 777 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 778 | |
779 | auth_method = "bsdauth"; | |
780 | ||
781 | return (authok != 0); | |
782 | } | |
783 | #endif | |
784 | ||
785 | #ifdef SKEY | |
786 | int | |
ca75d7de | 787 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 788 | { |
789 | struct skey skey; | |
790 | char challenge[1024]; | |
6d6c25e3 | 791 | u_int success; |
1853d1ef | 792 | |
f2b7b5c8 | 793 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
794 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 795 | |
796 | buffer_clear(m); | |
6d6c25e3 | 797 | buffer_put_int(m, success); |
798 | if (success) | |
1853d1ef | 799 | buffer_put_cstring(m, challenge); |
800 | ||
6d6c25e3 | 801 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 802 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 803 | |
804 | return (0); | |
805 | } | |
806 | ||
807 | int | |
ca75d7de | 808 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 809 | { |
810 | char *response; | |
811 | int authok; | |
812 | ||
813 | response = buffer_get_string(m, NULL); | |
814 | ||
aa586f8e | 815 | authok = (options.challenge_response_authentication && |
816 | authctxt->valid && | |
1853d1ef | 817 | skey_haskey(authctxt->pw->pw_name) == 0 && |
818 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
819 | ||
820 | xfree(response); | |
821 | ||
822 | buffer_clear(m); | |
823 | buffer_put_int(m, authok); | |
824 | ||
1588c277 | 825 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 826 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 827 | |
828 | auth_method = "skey"; | |
829 | ||
830 | return (authok != 0); | |
831 | } | |
832 | #endif | |
833 | ||
ad200abb | 834 | #ifdef USE_PAM |
835 | int | |
8b3ec5fd | 836 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 837 | { |
7fceb20d | 838 | if (!options.use_pam) |
839 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
840 | ||
529d73ab | 841 | start_pam(authctxt); |
ad200abb | 842 | |
5b9e2464 | 843 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
844 | ||
ad200abb | 845 | return (0); |
846 | } | |
05114c74 | 847 | |
5b9e2464 | 848 | int |
8b3ec5fd | 849 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 850 | { |
851 | u_int ret; | |
b6453d99 | 852 | |
5b9e2464 | 853 | if (!options.use_pam) |
854 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
855 | ||
856 | ret = do_pam_account(); | |
857 | ||
858 | buffer_put_int(m, ret); | |
cfb60d3a | 859 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 860 | |
8b3ec5fd | 861 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 862 | |
863 | return (ret); | |
864 | } | |
865 | ||
05114c74 | 866 | static void *sshpam_ctxt, *sshpam_authok; |
867 | extern KbdintDevice sshpam_device; | |
868 | ||
869 | int | |
8b3ec5fd | 870 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 871 | { |
872 | ||
873 | debug3("%s", __func__); | |
874 | authctxt->user = buffer_get_string(m, NULL); | |
875 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
876 | sshpam_authok = NULL; | |
877 | buffer_clear(m); | |
878 | if (sshpam_ctxt != NULL) { | |
879 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
880 | buffer_put_int(m, 1); | |
881 | } else { | |
882 | buffer_put_int(m, 0); | |
883 | } | |
8b3ec5fd | 884 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 885 | return (0); |
886 | } | |
887 | ||
888 | int | |
8b3ec5fd | 889 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 890 | { |
891 | char *name, *info, **prompts; | |
a1a073cc | 892 | u_int i, num, *echo_on; |
893 | int ret; | |
05114c74 | 894 | |
895 | debug3("%s", __func__); | |
896 | sshpam_authok = NULL; | |
897 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
898 | if (ret == 0 && num == 0) | |
899 | sshpam_authok = sshpam_ctxt; | |
900 | if (num > 1 || name == NULL || info == NULL) | |
901 | ret = -1; | |
902 | buffer_clear(m); | |
903 | buffer_put_int(m, ret); | |
904 | buffer_put_cstring(m, name); | |
905 | xfree(name); | |
906 | buffer_put_cstring(m, info); | |
907 | xfree(info); | |
908 | buffer_put_int(m, num); | |
909 | for (i = 0; i < num; ++i) { | |
910 | buffer_put_cstring(m, prompts[i]); | |
911 | xfree(prompts[i]); | |
912 | buffer_put_int(m, echo_on[i]); | |
913 | } | |
914 | if (prompts != NULL) | |
915 | xfree(prompts); | |
916 | if (echo_on != NULL) | |
917 | xfree(echo_on); | |
2ae7f715 | 918 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 919 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 920 | return (0); |
921 | } | |
922 | ||
923 | int | |
8b3ec5fd | 924 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 925 | { |
926 | char **resp; | |
a1a073cc | 927 | u_int i, num; |
928 | int ret; | |
05114c74 | 929 | |
930 | debug3("%s", __func__); | |
931 | sshpam_authok = NULL; | |
932 | num = buffer_get_int(m); | |
933 | if (num > 0) { | |
01d35895 | 934 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 935 | for (i = 0; i < num; ++i) |
936 | resp[i] = buffer_get_string(m, NULL); | |
937 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
938 | for (i = 0; i < num; ++i) | |
939 | xfree(resp[i]); | |
940 | xfree(resp); | |
941 | } else { | |
942 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
943 | } | |
944 | buffer_clear(m); | |
945 | buffer_put_int(m, ret); | |
8b3ec5fd | 946 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 947 | auth_method = "keyboard-interactive/pam"; |
948 | if (ret == 0) | |
949 | sshpam_authok = sshpam_ctxt; | |
950 | return (0); | |
951 | } | |
952 | ||
953 | int | |
8b3ec5fd | 954 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 955 | { |
956 | ||
957 | debug3("%s", __func__); | |
958 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
959 | buffer_clear(m); | |
8b3ec5fd | 960 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 961 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 962 | return (sshpam_authok == sshpam_ctxt); |
963 | } | |
ad200abb | 964 | #endif |
965 | ||
1853d1ef | 966 | static void |
967 | mm_append_debug(Buffer *m) | |
968 | { | |
969 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 970 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 971 | buffer_append(m, buffer_ptr(&auth_debug), |
972 | buffer_len(&auth_debug)); | |
973 | buffer_clear(&auth_debug); | |
974 | } | |
975 | } | |
976 | ||
977 | int | |
ca75d7de | 978 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 979 | { |
980 | Key *key; | |
661e45a0 | 981 | char *cuser, *chost; |
982 | u_char *blob; | |
1853d1ef | 983 | u_int bloblen; |
984 | enum mm_keytype type = 0; | |
985 | int allowed = 0; | |
986 | ||
1588c277 | 987 | debug3("%s entering", __func__); |
1853d1ef | 988 | |
989 | type = buffer_get_int(m); | |
990 | cuser = buffer_get_string(m, NULL); | |
991 | chost = buffer_get_string(m, NULL); | |
992 | blob = buffer_get_string(m, &bloblen); | |
993 | ||
994 | key = key_from_blob(blob, bloblen); | |
995 | ||
996 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
997 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 998 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 999 | |
1588c277 | 1000 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1001 | |
fdaef11e | 1002 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1003 | switch (type) { |
1853d1ef | 1004 | case MM_USERKEY: |
aa586f8e | 1005 | allowed = options.pubkey_authentication && |
1006 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1007 | auth_method = "publickey"; |
1853d1ef | 1008 | break; |
1009 | case MM_HOSTKEY: | |
aa586f8e | 1010 | allowed = options.hostbased_authentication && |
1011 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1012 | cuser, chost, key); |
c023a130 | 1013 | auth_method = "hostbased"; |
1853d1ef | 1014 | break; |
1015 | case MM_RSAHOSTKEY: | |
1016 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1017 | allowed = options.rhosts_rsa_authentication && |
1018 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1019 | cuser, chost, key); |
c023a130 | 1020 | auth_method = "rsa"; |
1853d1ef | 1021 | break; |
1022 | default: | |
1588c277 | 1023 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1024 | break; |
1025 | } | |
1853d1ef | 1026 | } |
3e2f2431 | 1027 | if (key != NULL) |
1028 | key_free(key); | |
1853d1ef | 1029 | |
1030 | /* clear temporarily storage (used by verify) */ | |
1031 | monitor_reset_key_state(); | |
1032 | ||
1033 | if (allowed) { | |
1034 | /* Save temporarily for comparison in verify */ | |
1035 | key_blob = blob; | |
1036 | key_bloblen = bloblen; | |
1037 | key_blobtype = type; | |
1038 | hostbased_cuser = cuser; | |
1039 | hostbased_chost = chost; | |
98d40a74 | 1040 | } else { |
c023a130 | 1041 | /* Log failed attempt */ |
1042 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1043 | xfree(blob); |
1044 | xfree(cuser); | |
1045 | xfree(chost); | |
1853d1ef | 1046 | } |
1047 | ||
1048 | debug3("%s: key %p is %s", | |
1588c277 | 1049 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1050 | |
1051 | buffer_clear(m); | |
1052 | buffer_put_int(m, allowed); | |
92e15201 | 1053 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1054 | |
1055 | mm_append_debug(m); | |
1056 | ||
ca75d7de | 1057 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1058 | |
1059 | if (type == MM_RSAHOSTKEY) | |
1060 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1061 | ||
1062 | return (0); | |
1063 | } | |
1064 | ||
1065 | static int | |
1066 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1067 | { | |
1068 | Buffer b; | |
661e45a0 | 1069 | char *p; |
1853d1ef | 1070 | u_int len; |
1071 | int fail = 0; | |
1853d1ef | 1072 | |
1073 | buffer_init(&b); | |
1074 | buffer_append(&b, data, datalen); | |
1075 | ||
1076 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1077 | p = buffer_ptr(&b); |
1078 | len = buffer_len(&b); | |
1079 | if ((session_id2 == NULL) || | |
1080 | (len < session_id2_len) || | |
1081 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1082 | fail++; | |
1853d1ef | 1083 | buffer_consume(&b, session_id2_len); |
1084 | } else { | |
521d606b | 1085 | p = buffer_get_string(&b, &len); |
1086 | if ((session_id2 == NULL) || | |
1087 | (len != session_id2_len) || | |
1088 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1089 | fail++; |
521d606b | 1090 | xfree(p); |
1853d1ef | 1091 | } |
1092 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1093 | fail++; | |
1094 | p = buffer_get_string(&b, NULL); | |
1095 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1096 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1097 | authctxt->user, p); |
1098 | fail++; | |
1099 | } | |
1100 | xfree(p); | |
1101 | buffer_skip_string(&b); | |
1102 | if (datafellows & SSH_BUG_PKAUTH) { | |
1103 | if (!buffer_get_char(&b)) | |
1104 | fail++; | |
1105 | } else { | |
1106 | p = buffer_get_string(&b, NULL); | |
1107 | if (strcmp("publickey", p) != 0) | |
1108 | fail++; | |
1109 | xfree(p); | |
1110 | if (!buffer_get_char(&b)) | |
1111 | fail++; | |
1112 | buffer_skip_string(&b); | |
1113 | } | |
1114 | buffer_skip_string(&b); | |
1115 | if (buffer_len(&b) != 0) | |
1116 | fail++; | |
1117 | buffer_free(&b); | |
1118 | return (fail == 0); | |
1119 | } | |
1120 | ||
1121 | static int | |
661e45a0 | 1122 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1123 | char *chost) | |
1853d1ef | 1124 | { |
1125 | Buffer b; | |
661e45a0 | 1126 | char *p; |
1853d1ef | 1127 | u_int len; |
1128 | int fail = 0; | |
1853d1ef | 1129 | |
1130 | buffer_init(&b); | |
1131 | buffer_append(&b, data, datalen); | |
1132 | ||
521d606b | 1133 | p = buffer_get_string(&b, &len); |
1134 | if ((session_id2 == NULL) || | |
1135 | (len != session_id2_len) || | |
1136 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1137 | fail++; |
521d606b | 1138 | xfree(p); |
1139 | ||
1853d1ef | 1140 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1141 | fail++; | |
1142 | p = buffer_get_string(&b, NULL); | |
1143 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1144 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1145 | authctxt->user, p); |
1146 | fail++; | |
1147 | } | |
1148 | xfree(p); | |
1149 | buffer_skip_string(&b); /* service */ | |
1150 | p = buffer_get_string(&b, NULL); | |
1151 | if (strcmp(p, "hostbased") != 0) | |
1152 | fail++; | |
1153 | xfree(p); | |
1154 | buffer_skip_string(&b); /* pkalg */ | |
1155 | buffer_skip_string(&b); /* pkblob */ | |
1156 | ||
1157 | /* verify client host, strip trailing dot if necessary */ | |
1158 | p = buffer_get_string(&b, NULL); | |
1159 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1160 | p[len - 1] = '\0'; | |
1161 | if (strcmp(p, chost) != 0) | |
1162 | fail++; | |
1163 | xfree(p); | |
1164 | ||
1165 | /* verify client user */ | |
1166 | p = buffer_get_string(&b, NULL); | |
1167 | if (strcmp(p, cuser) != 0) | |
1168 | fail++; | |
1169 | xfree(p); | |
1170 | ||
1171 | if (buffer_len(&b) != 0) | |
1172 | fail++; | |
1173 | buffer_free(&b); | |
1174 | return (fail == 0); | |
1175 | } | |
1176 | ||
1177 | int | |
ca75d7de | 1178 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1179 | { |
1180 | Key *key; | |
1181 | u_char *signature, *data, *blob; | |
1182 | u_int signaturelen, datalen, bloblen; | |
1183 | int verified = 0; | |
1184 | int valid_data = 0; | |
1185 | ||
1186 | blob = buffer_get_string(m, &bloblen); | |
1187 | signature = buffer_get_string(m, &signaturelen); | |
1188 | data = buffer_get_string(m, &datalen); | |
1189 | ||
1190 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1191 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1192 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1193 | |
1194 | key = key_from_blob(blob, bloblen); | |
1195 | if (key == NULL) | |
1588c277 | 1196 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1197 | |
1198 | switch (key_blobtype) { | |
1199 | case MM_USERKEY: | |
1200 | valid_data = monitor_valid_userblob(data, datalen); | |
1201 | break; | |
1202 | case MM_HOSTKEY: | |
1203 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1204 | hostbased_cuser, hostbased_chost); | |
1205 | break; | |
1206 | default: | |
1207 | valid_data = 0; | |
1208 | break; | |
1209 | } | |
1210 | if (!valid_data) | |
1588c277 | 1211 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1212 | |
1213 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1214 | debug3("%s: key %p signature %s", | |
1588c277 | 1215 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1216 | |
1217 | key_free(key); | |
1218 | xfree(blob); | |
1219 | xfree(signature); | |
1220 | xfree(data); | |
1221 | ||
d17ef027 | 1222 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1223 | ||
1853d1ef | 1224 | monitor_reset_key_state(); |
1225 | ||
1226 | buffer_clear(m); | |
1227 | buffer_put_int(m, verified); | |
ca75d7de | 1228 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1229 | |
1853d1ef | 1230 | return (verified); |
1231 | } | |
1232 | ||
1233 | static void | |
1234 | mm_record_login(Session *s, struct passwd *pw) | |
1235 | { | |
1236 | socklen_t fromlen; | |
1237 | struct sockaddr_storage from; | |
1238 | ||
1239 | /* | |
1240 | * Get IP address of client. If the connection is not a socket, let | |
1241 | * the address be 0.0.0.0. | |
1242 | */ | |
1243 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1244 | fromlen = sizeof(from); |
1853d1ef | 1245 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1246 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1247 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1248 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1249 | cleanup_exit(255); |
1853d1ef | 1250 | } |
1251 | } | |
1252 | /* Record that there was a login on that tty from the remote host. */ | |
1253 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1254 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1255 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1256 | } |
1257 | ||
1258 | static void | |
1259 | mm_session_close(Session *s) | |
1260 | { | |
b9ed513a | 1261 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1262 | if (s->ttyfd != -1) { |
1588c277 | 1263 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1264 | session_pty_cleanup2(s); |
1265 | } | |
1266 | s->used = 0; | |
1267 | } | |
1268 | ||
1269 | int | |
ca75d7de | 1270 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1271 | { |
b5a28cbc | 1272 | extern struct monitor *pmonitor; |
1853d1ef | 1273 | Session *s; |
1274 | int res, fd0; | |
1275 | ||
1588c277 | 1276 | debug3("%s entering", __func__); |
1853d1ef | 1277 | |
1278 | buffer_clear(m); | |
1279 | s = session_new(); | |
1280 | if (s == NULL) | |
1281 | goto error; | |
1282 | s->authctxt = authctxt; | |
1283 | s->pw = authctxt->pw; | |
b5a28cbc | 1284 | s->pid = pmonitor->m_pid; |
1853d1ef | 1285 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1286 | if (res == 0) | |
1287 | goto error; | |
1853d1ef | 1288 | pty_setowner(authctxt->pw, s->tty); |
1289 | ||
1290 | buffer_put_int(m, 1); | |
1291 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1292 | |
1293 | /* We need to trick ttyslot */ | |
1294 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1295 | fatal("%s: dup2", __func__); |
1853d1ef | 1296 | |
1297 | mm_record_login(s, authctxt->pw); | |
1298 | ||
1299 | /* Now we can close the file descriptor again */ | |
1300 | close(0); | |
1301 | ||
be2ca0c9 | 1302 | /* send messages generated by record_login */ |
1303 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1304 | buffer_clear(&loginmsg); | |
1305 | ||
1306 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1307 | ||
1308 | mm_send_fd(sock, s->ptyfd); | |
1309 | mm_send_fd(sock, s->ttyfd); | |
1310 | ||
1853d1ef | 1311 | /* make sure nothing uses fd 0 */ |
1312 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1313 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1314 | if (fd0 != 0) |
1588c277 | 1315 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1316 | |
1317 | /* slave is not needed */ | |
1318 | close(s->ttyfd); | |
1319 | s->ttyfd = s->ptyfd; | |
1320 | /* no need to dup() because nobody closes ptyfd */ | |
1321 | s->ptymaster = s->ptyfd; | |
1322 | ||
1588c277 | 1323 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1324 | |
1325 | return (0); | |
1326 | ||
1327 | error: | |
1328 | if (s != NULL) | |
1329 | mm_session_close(s); | |
1330 | buffer_put_int(m, 0); | |
ca75d7de | 1331 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1332 | return (0); |
1333 | } | |
1334 | ||
1335 | int | |
ca75d7de | 1336 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1337 | { |
1338 | Session *s; | |
1339 | char *tty; | |
1340 | ||
1588c277 | 1341 | debug3("%s entering", __func__); |
1853d1ef | 1342 | |
1343 | tty = buffer_get_string(m, NULL); | |
1344 | if ((s = session_by_tty(tty)) != NULL) | |
1345 | mm_session_close(s); | |
1346 | buffer_clear(m); | |
1347 | xfree(tty); | |
1348 | return (0); | |
1349 | } | |
1350 | ||
1351 | int | |
ca75d7de | 1352 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1353 | { |
1354 | BIGNUM *p; | |
1355 | int rsafail; | |
1356 | ||
1357 | /* Turn off permissions */ | |
75cccc2c | 1358 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1359 | |
1360 | if ((p = BN_new()) == NULL) | |
1588c277 | 1361 | fatal("%s: BN_new", __func__); |
1853d1ef | 1362 | |
1363 | buffer_get_bignum2(m, p); | |
1364 | ||
1365 | rsafail = ssh1_session_key(p); | |
1366 | ||
1367 | buffer_clear(m); | |
1368 | buffer_put_int(m, rsafail); | |
1369 | buffer_put_bignum2(m, p); | |
1370 | ||
1371 | BN_clear_free(p); | |
1372 | ||
ca75d7de | 1373 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1374 | |
1375 | /* Turn on permissions for sessid passing */ | |
1376 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1377 | ||
1378 | return (0); | |
1379 | } | |
1380 | ||
1381 | int | |
ca75d7de | 1382 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1383 | { |
1384 | int i; | |
1385 | ||
1588c277 | 1386 | debug3("%s entering", __func__); |
1853d1ef | 1387 | |
1388 | if (buffer_len(m) != 16) | |
1588c277 | 1389 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1390 | for (i = 0; i < 16; i++) |
1391 | session_id[i] = buffer_get_char(m); | |
1392 | ||
1393 | /* Turn on permissions for getpwnam */ | |
1394 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1395 | ||
1396 | return (0); | |
1397 | } | |
1398 | ||
1399 | int | |
ca75d7de | 1400 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1401 | { |
1402 | BIGNUM *client_n; | |
1403 | Key *key = NULL; | |
1404 | u_char *blob = NULL; | |
1405 | u_int blen = 0; | |
1406 | int allowed = 0; | |
1407 | ||
1588c277 | 1408 | debug3("%s entering", __func__); |
1853d1ef | 1409 | |
c023a130 | 1410 | auth_method = "rsa"; |
aa586f8e | 1411 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1412 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1413 | fatal("%s: BN_new", __func__); |
1853d1ef | 1414 | buffer_get_bignum2(m, client_n); |
1415 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1416 | BN_clear_free(client_n); | |
1417 | } | |
1418 | buffer_clear(m); | |
1419 | buffer_put_int(m, allowed); | |
92e15201 | 1420 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1421 | |
1422 | /* clear temporarily storage (used by generate challenge) */ | |
1423 | monitor_reset_key_state(); | |
1424 | ||
1425 | if (allowed && key != NULL) { | |
1426 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1427 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1428 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1429 | buffer_put_string(m, blob, blen); |
1430 | ||
1431 | /* Save temporarily for comparison in verify */ | |
1432 | key_blob = blob; | |
1433 | key_bloblen = blen; | |
1434 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1435 | } |
3e2f2431 | 1436 | if (key != NULL) |
1437 | key_free(key); | |
1853d1ef | 1438 | |
1439 | mm_append_debug(m); | |
1440 | ||
ca75d7de | 1441 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1442 | |
1443 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1444 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1445 | return (0); | |
1446 | } | |
1447 | ||
1448 | int | |
ca75d7de | 1449 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1450 | { |
1451 | Key *key = NULL; | |
1452 | u_char *blob; | |
1453 | u_int blen; | |
1454 | ||
1588c277 | 1455 | debug3("%s entering", __func__); |
1853d1ef | 1456 | |
1457 | if (!authctxt->valid) | |
1588c277 | 1458 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1459 | blob = buffer_get_string(m, &blen); |
1460 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1461 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1462 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1463 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1464 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1465 | fatal("%s: received bad key", __func__); |
1853d1ef | 1466 | |
1467 | if (ssh1_challenge) | |
1468 | BN_clear_free(ssh1_challenge); | |
1469 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1470 | ||
1471 | buffer_clear(m); | |
1472 | buffer_put_bignum2(m, ssh1_challenge); | |
1473 | ||
1588c277 | 1474 | debug3("%s sending reply", __func__); |
ca75d7de | 1475 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1476 | |
1477 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1478 | |
1479 | xfree(blob); | |
1480 | key_free(key); | |
1853d1ef | 1481 | return (0); |
1482 | } | |
1483 | ||
1484 | int | |
ca75d7de | 1485 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1486 | { |
1487 | Key *key = NULL; | |
1488 | u_char *blob, *response; | |
1489 | u_int blen, len; | |
1490 | int success; | |
1491 | ||
1588c277 | 1492 | debug3("%s entering", __func__); |
1853d1ef | 1493 | |
1494 | if (!authctxt->valid) | |
1588c277 | 1495 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1496 | if (ssh1_challenge == NULL) |
1588c277 | 1497 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1498 | |
1499 | blob = buffer_get_string(m, &blen); | |
1500 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1501 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1502 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1503 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1504 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1505 | fatal("%s: received bad key", __func__); |
1853d1ef | 1506 | response = buffer_get_string(m, &len); |
1507 | if (len != 16) | |
1588c277 | 1508 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1509 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1510 | ||
3e2f2431 | 1511 | xfree(blob); |
1853d1ef | 1512 | key_free(key); |
1513 | xfree(response); | |
1514 | ||
1515 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1516 | ||
1517 | /* reset state */ | |
1518 | BN_clear_free(ssh1_challenge); | |
1519 | ssh1_challenge = NULL; | |
1520 | monitor_reset_key_state(); | |
1521 | ||
1522 | buffer_clear(m); | |
1523 | buffer_put_int(m, success); | |
ca75d7de | 1524 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1525 | |
1526 | return (success); | |
1527 | } | |
1528 | ||
1529 | int | |
ca75d7de | 1530 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1531 | { |
b5a28cbc | 1532 | extern struct monitor *pmonitor; |
1853d1ef | 1533 | int res, status; |
1534 | ||
1588c277 | 1535 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1536 | |
1537 | /* The child is terminating */ | |
1538 | session_destroy_all(&mm_session_close); | |
1539 | ||
b5a28cbc | 1540 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1541 | if (errno != EINTR) |
1542 | exit(1); | |
1853d1ef | 1543 | |
1544 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1545 | ||
1546 | /* Terminate process */ | |
f6be21a0 | 1547 | exit(res); |
1853d1ef | 1548 | } |
1549 | ||
6039eeef | 1550 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1551 | /* Report that an audit event occurred */ |
1552 | int | |
1553 | mm_answer_audit_event(int socket, Buffer *m) | |
1554 | { | |
1555 | ssh_audit_event_t event; | |
1556 | ||
1557 | debug3("%s entering", __func__); | |
1558 | ||
1559 | event = buffer_get_int(m); | |
c00e4d75 | 1560 | switch(event) { |
6039eeef | 1561 | case SSH_AUTH_FAIL_PUBKEY: |
1562 | case SSH_AUTH_FAIL_HOSTBASED: | |
1563 | case SSH_AUTH_FAIL_GSSAPI: | |
1564 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1565 | case SSH_LOGIN_ROOT_DENIED: | |
1566 | case SSH_CONNECTION_CLOSE: | |
1567 | case SSH_INVALID_USER: | |
c00e4d75 | 1568 | audit_event(event); |
1569 | break; | |
1570 | default: | |
1571 | fatal("Audit event type %d not permitted", event); | |
1572 | } | |
1573 | ||
1574 | return (0); | |
1575 | } | |
1576 | ||
1577 | int | |
1578 | mm_answer_audit_command(int socket, Buffer *m) | |
1579 | { | |
1580 | u_int len; | |
1581 | char *cmd; | |
1582 | ||
1583 | debug3("%s entering", __func__); | |
1584 | cmd = buffer_get_string(m, &len); | |
1585 | /* sanity check command, if so how? */ | |
1586 | audit_run_command(cmd); | |
1587 | xfree(cmd); | |
c00e4d75 | 1588 | return (0); |
1589 | } | |
6039eeef | 1590 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1591 | |
1853d1ef | 1592 | void |
b5a28cbc | 1593 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1594 | { |
1595 | if (compat20) { | |
1596 | set_newkeys(MODE_IN); | |
1597 | set_newkeys(MODE_OUT); | |
1598 | } else { | |
1853d1ef | 1599 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1600 | packet_set_encryption_key(child_state.ssh1key, |
1601 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1602 | xfree(child_state.ssh1key); | |
1853d1ef | 1603 | } |
1604 | ||
9459414c | 1605 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1606 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1607 | xfree(child_state.keyout); | |
1608 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1609 | xfree(child_state.keyin); | |
1610 | ||
1611 | if (!compat20) { | |
1612 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1613 | xfree(child_state.ivout); | |
1614 | packet_set_iv(MODE_IN, child_state.ivin); | |
1615 | xfree(child_state.ivin); | |
1616 | } | |
1617 | ||
1618 | memcpy(&incoming_stream, &child_state.incoming, | |
1619 | sizeof(incoming_stream)); | |
1620 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1621 | sizeof(outgoing_stream)); | |
1622 | ||
1623 | /* Update with new address */ | |
0496cf34 | 1624 | if (options.compression) |
1625 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1626 | |
1627 | /* Network I/O buffers */ | |
1628 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1629 | buffer_clear(&input); | |
1630 | buffer_append(&input, child_state.input, child_state.ilen); | |
1631 | memset(child_state.input, 0, child_state.ilen); | |
1632 | xfree(child_state.input); | |
1633 | ||
1634 | buffer_clear(&output); | |
1635 | buffer_append(&output, child_state.output, child_state.olen); | |
1636 | memset(child_state.output, 0, child_state.olen); | |
1637 | xfree(child_state.output); | |
1638 | } | |
1639 | ||
1640 | static Kex * | |
1641 | mm_get_kex(Buffer *m) | |
1642 | { | |
1643 | Kex *kex; | |
1644 | void *blob; | |
1645 | u_int bloblen; | |
1646 | ||
52e3daed | 1647 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1648 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1649 | if ((session_id2 == NULL) || |
1650 | (kex->session_id_len != session_id2_len) || | |
1651 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1652 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1653 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1654 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1655 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1656 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1657 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1658 | kex->server = 1; |
1659 | kex->hostkey_type = buffer_get_int(m); | |
1660 | kex->kex_type = buffer_get_int(m); | |
1661 | blob = buffer_get_string(m, &bloblen); | |
1662 | buffer_init(&kex->my); | |
1663 | buffer_append(&kex->my, blob, bloblen); | |
1664 | xfree(blob); | |
1665 | blob = buffer_get_string(m, &bloblen); | |
1666 | buffer_init(&kex->peer); | |
1667 | buffer_append(&kex->peer, blob, bloblen); | |
1668 | xfree(blob); | |
1669 | kex->done = 1; | |
1670 | kex->flags = buffer_get_int(m); | |
1671 | kex->client_version_string = buffer_get_string(m, NULL); | |
1672 | kex->server_version_string = buffer_get_string(m, NULL); | |
1673 | kex->load_host_key=&get_hostkey_by_type; | |
1674 | kex->host_key_index=&get_hostkey_index; | |
1675 | ||
1676 | return (kex); | |
1677 | } | |
1678 | ||
1679 | /* This function requries careful sanity checking */ | |
1680 | ||
1681 | void | |
b5a28cbc | 1682 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1683 | { |
1684 | Buffer m; | |
1685 | u_char *blob, *p; | |
1686 | u_int bloblen, plen; | |
ffd7b36b | 1687 | u_int32_t seqnr, packets; |
1688 | u_int64_t blocks; | |
1853d1ef | 1689 | |
1588c277 | 1690 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1691 | |
1692 | buffer_init(&m); | |
b5a28cbc | 1693 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1694 | if (!compat20) { |
1695 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1696 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1697 | child_state.ssh1key = buffer_get_string(&m, |
1698 | &child_state.ssh1keylen); | |
1853d1ef | 1699 | child_state.ivout = buffer_get_string(&m, |
1700 | &child_state.ivoutlen); | |
1701 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1702 | goto skip; | |
1703 | } else { | |
1704 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1705 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1706 | } |
1707 | ||
1708 | blob = buffer_get_string(&m, &bloblen); | |
1709 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1710 | xfree(blob); | |
1711 | ||
1588c277 | 1712 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1713 | blob = buffer_get_string(&m, &bloblen); |
1714 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1715 | xfree(blob); | |
1716 | ||
1717 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1718 | seqnr = buffer_get_int(&m); |
1719 | blocks = buffer_get_int64(&m); | |
1720 | packets = buffer_get_int(&m); | |
1721 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1722 | seqnr = buffer_get_int(&m); | |
1723 | blocks = buffer_get_int64(&m); | |
1724 | packets = buffer_get_int(&m); | |
1725 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1726 | |
1727 | skip: | |
1728 | /* Get the key context */ | |
1729 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1730 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1731 | ||
1588c277 | 1732 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1733 | /* Get compression state */ |
1734 | p = buffer_get_string(&m, &plen); | |
1735 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1736 | fatal("%s: bad request size", __func__); |
1853d1ef | 1737 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1738 | xfree(p); | |
1739 | ||
1740 | p = buffer_get_string(&m, &plen); | |
1741 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1742 | fatal("%s: bad request size", __func__); |
1853d1ef | 1743 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1744 | xfree(p); | |
1745 | ||
1746 | /* Network I/O buffers */ | |
1588c277 | 1747 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1748 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1749 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1750 | ||
1751 | buffer_free(&m); | |
1752 | } | |
1753 | ||
1754 | ||
1755 | /* Allocation functions for zlib */ | |
1756 | void * | |
1757 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1758 | { | |
39e71188 | 1759 | size_t len = (size_t) size * ncount; |
1853d1ef | 1760 | void *address; |
1761 | ||
b85698ab | 1762 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1763 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1764 | ||
1765 | address = mm_malloc(mm, len); | |
1853d1ef | 1766 | |
1767 | return (address); | |
1768 | } | |
1769 | ||
1770 | void | |
1771 | mm_zfree(struct mm_master *mm, void *address) | |
1772 | { | |
1773 | mm_free(mm, address); | |
1774 | } | |
1775 | ||
1776 | void | |
1777 | mm_init_compression(struct mm_master *mm) | |
1778 | { | |
1779 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1780 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1781 | outgoing_stream.opaque = mm; | |
1782 | ||
1783 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1784 | incoming_stream.zfree = (free_func)mm_zfree; | |
1785 | incoming_stream.opaque = mm; | |
1786 | } | |
1787 | ||
1788 | /* XXX */ | |
1789 | ||
1790 | #define FD_CLOSEONEXEC(x) do { \ | |
1791 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1792 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1793 | } while (0) | |
1794 | ||
1795 | static void | |
1796 | monitor_socketpair(int *pair) | |
1797 | { | |
f1af2dbf | 1798 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1799 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1800 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1801 | #else |
1802 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1803 | __func__); |
f1af2dbf | 1804 | #endif |
1853d1ef | 1805 | FD_CLOSEONEXEC(pair[0]); |
1806 | FD_CLOSEONEXEC(pair[1]); | |
1807 | } | |
1808 | ||
1809 | #define MM_MEMSIZE 65536 | |
1810 | ||
1811 | struct monitor * | |
1812 | monitor_init(void) | |
1813 | { | |
1814 | struct monitor *mon; | |
1815 | int pair[2]; | |
1816 | ||
52e3daed | 1817 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1818 | |
1819 | monitor_socketpair(pair); | |
1820 | ||
1821 | mon->m_recvfd = pair[0]; | |
1822 | mon->m_sendfd = pair[1]; | |
1823 | ||
1824 | /* Used to share zlib space across processes */ | |
0496cf34 | 1825 | if (options.compression) { |
1826 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1827 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1828 | |
0496cf34 | 1829 | /* Compression needs to share state across borders */ |
1830 | mm_init_compression(mon->m_zlib); | |
1831 | } | |
1853d1ef | 1832 | |
1833 | return mon; | |
1834 | } | |
1835 | ||
1836 | void | |
1837 | monitor_reinit(struct monitor *mon) | |
1838 | { | |
1839 | int pair[2]; | |
1840 | ||
1841 | monitor_socketpair(pair); | |
1842 | ||
1843 | mon->m_recvfd = pair[0]; | |
1844 | mon->m_sendfd = pair[1]; | |
1845 | } | |
7364bd04 | 1846 | |
1847 | #ifdef GSSAPI | |
1848 | int | |
ca75d7de | 1849 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1850 | { |
ca75d7de | 1851 | gss_OID_desc goid; |
7364bd04 | 1852 | OM_uint32 major; |
1853 | u_int len; | |
1854 | ||
ca75d7de | 1855 | goid.elements = buffer_get_string(m, &len); |
1856 | goid.length = len; | |
7364bd04 | 1857 | |
ca75d7de | 1858 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1859 | |
ca75d7de | 1860 | xfree(goid.elements); |
7364bd04 | 1861 | |
1862 | buffer_clear(m); | |
1863 | buffer_put_int(m, major); | |
1864 | ||
8442cc66 | 1865 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1866 | |
1867 | /* Now we have a context, enable the step */ | |
1868 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1869 | ||
1870 | return (0); | |
1871 | } | |
1872 | ||
1873 | int | |
ca75d7de | 1874 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1875 | { |
1876 | gss_buffer_desc in; | |
1877 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1878 | OM_uint32 major, minor; |
7364bd04 | 1879 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1880 | u_int len; |
7364bd04 | 1881 | |
f99e1ca4 | 1882 | in.value = buffer_get_string(m, &len); |
1883 | in.length = len; | |
7364bd04 | 1884 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1885 | xfree(in.value); | |
1886 | ||
1887 | buffer_clear(m); | |
1888 | buffer_put_int(m, major); | |
1889 | buffer_put_string(m, out.value, out.length); | |
1890 | buffer_put_int(m, flags); | |
ca75d7de | 1891 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1892 | |
1893 | gss_release_buffer(&minor, &out); | |
1894 | ||
8442cc66 | 1895 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1896 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1897 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1898 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1899 | } |
1900 | return (0); | |
1901 | } | |
1902 | ||
0789992b | 1903 | int |
ca75d7de | 1904 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1905 | { |
1906 | gss_buffer_desc gssbuf, mic; | |
1907 | OM_uint32 ret; | |
1908 | u_int len; | |
b6453d99 | 1909 | |
0789992b | 1910 | gssbuf.value = buffer_get_string(m, &len); |
1911 | gssbuf.length = len; | |
1912 | mic.value = buffer_get_string(m, &len); | |
1913 | mic.length = len; | |
b6453d99 | 1914 | |
0789992b | 1915 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1916 | |
0789992b | 1917 | xfree(gssbuf.value); |
1918 | xfree(mic.value); | |
b6453d99 | 1919 | |
0789992b | 1920 | buffer_clear(m); |
1921 | buffer_put_int(m, ret); | |
b6453d99 | 1922 | |
ca75d7de | 1923 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1924 | |
0789992b | 1925 | if (!GSS_ERROR(ret)) |
1926 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1927 | |
0789992b | 1928 | return (0); |
1929 | } | |
1930 | ||
7364bd04 | 1931 | int |
ca75d7de | 1932 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1933 | { |
1934 | int authenticated; | |
1935 | ||
1936 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1937 | ||
1938 | buffer_clear(m); | |
1939 | buffer_put_int(m, authenticated); | |
1940 | ||
1941 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1942 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1943 | |
8442cc66 | 1944 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1945 | |
1946 | /* Monitor loop will terminate if authenticated */ | |
1947 | return (authenticated); | |
1948 | } | |
1949 | #endif /* GSSAPI */ |