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1853d1ef | 1 | /* |
2 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
3 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
f8cc7664 | 28 | RCSID("$OpenBSD: monitor.c,v 1.63 2005/03/10 22:01:05 deraadt Exp $"); |
1853d1ef | 29 | |
30 | #include <openssl/dh.h> | |
31 | ||
32 | #ifdef SKEY | |
33 | #include <skey.h> | |
34 | #endif | |
35 | ||
36 | #include "ssh.h" | |
37 | #include "auth.h" | |
38 | #include "kex.h" | |
39 | #include "dh.h" | |
a655c012 | 40 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
41 | #undef TARGET_OS_MAC | |
9b08c23f | 42 | #include "zlib.h" |
a655c012 | 43 | #define TARGET_OS_MAC 1 |
44 | #else | |
45 | #include "zlib.h" | |
46 | #endif | |
1853d1ef | 47 | #include "packet.h" |
48 | #include "auth-options.h" | |
49 | #include "sshpty.h" | |
50 | #include "channels.h" | |
51 | #include "session.h" | |
52 | #include "sshlogin.h" | |
53 | #include "canohost.h" | |
54 | #include "log.h" | |
55 | #include "servconf.h" | |
56 | #include "monitor.h" | |
57 | #include "monitor_mm.h" | |
58 | #include "monitor_wrap.h" | |
59 | #include "monitor_fdpass.h" | |
60 | #include "xmalloc.h" | |
61 | #include "misc.h" | |
62 | #include "buffer.h" | |
63 | #include "bufaux.h" | |
64 | #include "compat.h" | |
65 | #include "ssh2.h" | |
1853d1ef | 66 | |
7364bd04 | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | static Gssctxt *gsscontext = NULL; | |
70 | #endif | |
71 | ||
1853d1ef | 72 | /* Imports */ |
73 | extern ServerOptions options; | |
74 | extern u_int utmp_len; | |
75 | extern Newkeys *current_keys[]; | |
76 | extern z_stream incoming_stream; | |
77 | extern z_stream outgoing_stream; | |
78 | extern u_char session_id[]; | |
79 | extern Buffer input, output; | |
80 | extern Buffer auth_debug; | |
81 | extern int auth_debug_init; | |
be2ca0c9 | 82 | extern Buffer loginmsg; |
1853d1ef | 83 | |
84 | /* State exported from the child */ | |
85 | ||
86 | struct { | |
87 | z_stream incoming; | |
88 | z_stream outgoing; | |
89 | u_char *keyin; | |
90 | u_int keyinlen; | |
91 | u_char *keyout; | |
92 | u_int keyoutlen; | |
93 | u_char *ivin; | |
94 | u_int ivinlen; | |
95 | u_char *ivout; | |
96 | u_int ivoutlen; | |
9459414c | 97 | u_char *ssh1key; |
98 | u_int ssh1keylen; | |
1853d1ef | 99 | int ssh1cipher; |
100 | int ssh1protoflags; | |
101 | u_char *input; | |
102 | u_int ilen; | |
103 | u_char *output; | |
104 | u_int olen; | |
105 | } child_state; | |
106 | ||
b8e04133 | 107 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 108 | |
109 | int mm_answer_moduli(int, Buffer *); | |
110 | int mm_answer_sign(int, Buffer *); | |
111 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 112 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 113 | int mm_answer_authserv(int, Buffer *); |
114 | int mm_answer_authpassword(int, Buffer *); | |
115 | int mm_answer_bsdauthquery(int, Buffer *); | |
116 | int mm_answer_bsdauthrespond(int, Buffer *); | |
117 | int mm_answer_skeyquery(int, Buffer *); | |
118 | int mm_answer_skeyrespond(int, Buffer *); | |
119 | int mm_answer_keyallowed(int, Buffer *); | |
120 | int mm_answer_keyverify(int, Buffer *); | |
121 | int mm_answer_pty(int, Buffer *); | |
122 | int mm_answer_pty_cleanup(int, Buffer *); | |
123 | int mm_answer_term(int, Buffer *); | |
124 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
125 | int mm_answer_rsa_challenge(int, Buffer *); | |
126 | int mm_answer_rsa_response(int, Buffer *); | |
127 | int mm_answer_sesskey(int, Buffer *); | |
128 | int mm_answer_sessid(int, Buffer *); | |
129 | ||
ad200abb | 130 | #ifdef USE_PAM |
131 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 132 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 133 | int mm_answer_pam_init_ctx(int, Buffer *); |
134 | int mm_answer_pam_query(int, Buffer *); | |
135 | int mm_answer_pam_respond(int, Buffer *); | |
136 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 137 | #endif |
138 | ||
7364bd04 | 139 | #ifdef GSSAPI |
140 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
141 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
142 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 143 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 144 | #endif |
696f6bef | 145 | |
6039eeef | 146 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 147 | int mm_answer_audit_event(int, Buffer *); |
148 | int mm_answer_audit_command(int, Buffer *); | |
149 | #endif | |
150 | ||
1853d1ef | 151 | static Authctxt *authctxt; |
152 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
153 | ||
154 | /* local state for key verify */ | |
155 | static u_char *key_blob = NULL; | |
156 | static u_int key_bloblen = 0; | |
157 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 158 | static char *hostbased_cuser = NULL; |
159 | static char *hostbased_chost = NULL; | |
1853d1ef | 160 | static char *auth_method = "unknown"; |
a27002e5 | 161 | static u_int session_id2_len = 0; |
521d606b | 162 | static u_char *session_id2 = NULL; |
3a39206f | 163 | static pid_t monitor_child_pid; |
1853d1ef | 164 | |
165 | struct mon_table { | |
166 | enum monitor_reqtype type; | |
167 | int flags; | |
168 | int (*f)(int, Buffer *); | |
169 | }; | |
170 | ||
171 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
172 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
173 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
174 | ||
175 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
176 | ||
177 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
178 | ||
179 | struct mon_table mon_dispatch_proto20[] = { | |
180 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
181 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
182 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
183 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 184 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 185 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 186 | #ifdef USE_PAM |
187 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 188 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 189 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
190 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
191 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
192 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 193 | #endif |
6039eeef | 194 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 195 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 196 | #endif |
1853d1ef | 197 | #ifdef BSD_AUTH |
198 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
199 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
200 | #endif | |
201 | #ifdef SKEY | |
202 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
203 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
204 | #endif | |
205 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
206 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 207 | #ifdef GSSAPI |
208 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
209 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
210 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 211 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 212 | #endif |
1853d1ef | 213 | {0, 0, NULL} |
214 | }; | |
215 | ||
216 | struct mon_table mon_dispatch_postauth20[] = { | |
217 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
218 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
219 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
220 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
221 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 222 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 223 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
224 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
225 | #endif | |
1853d1ef | 226 | {0, 0, NULL} |
227 | }; | |
228 | ||
229 | struct mon_table mon_dispatch_proto15[] = { | |
230 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
231 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
232 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
233 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
234 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
235 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
236 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
237 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
238 | #ifdef BSD_AUTH | |
239 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
240 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
241 | #endif | |
242 | #ifdef SKEY | |
243 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
244 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 245 | #endif |
246 | #ifdef USE_PAM | |
247 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 248 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 249 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
250 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
251 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
252 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 253 | #endif |
6039eeef | 254 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 255 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 256 | #endif |
257 | {0, 0, NULL} | |
258 | }; | |
259 | ||
260 | struct mon_table mon_dispatch_postauth15[] = { | |
261 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
262 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
263 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 264 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 265 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 266 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 267 | #endif |
1853d1ef | 268 | {0, 0, NULL} |
269 | }; | |
270 | ||
271 | struct mon_table *mon_dispatch; | |
272 | ||
273 | /* Specifies if a certain message is allowed at the moment */ | |
274 | ||
275 | static void | |
276 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
277 | { | |
278 | while (ent->f != NULL) { | |
279 | if (ent->type == type) { | |
280 | ent->flags &= ~MON_PERMIT; | |
281 | ent->flags |= permit ? MON_PERMIT : 0; | |
282 | return; | |
283 | } | |
284 | ent++; | |
285 | } | |
286 | } | |
287 | ||
288 | static void | |
289 | monitor_permit_authentications(int permit) | |
290 | { | |
291 | struct mon_table *ent = mon_dispatch; | |
292 | ||
293 | while (ent->f != NULL) { | |
294 | if (ent->flags & MON_AUTH) { | |
295 | ent->flags &= ~MON_PERMIT; | |
296 | ent->flags |= permit ? MON_PERMIT : 0; | |
297 | } | |
298 | ent++; | |
299 | } | |
300 | } | |
301 | ||
2362db19 | 302 | void |
303 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 304 | { |
305 | struct mon_table *ent; | |
306 | int authenticated = 0; | |
307 | ||
308 | debug3("preauth child monitor started"); | |
309 | ||
2362db19 | 310 | authctxt = _authctxt; |
311 | memset(authctxt, 0, sizeof(*authctxt)); | |
312 | ||
e05df884 | 313 | authctxt->loginmsg = &loginmsg; |
314 | ||
1853d1ef | 315 | if (compat20) { |
316 | mon_dispatch = mon_dispatch_proto20; | |
317 | ||
318 | /* Permit requests for moduli and signatures */ | |
319 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
320 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
321 | } else { | |
322 | mon_dispatch = mon_dispatch_proto15; | |
323 | ||
324 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
325 | } | |
326 | ||
1853d1ef | 327 | /* The first few requests do not require asynchronous access */ |
328 | while (!authenticated) { | |
b5a28cbc | 329 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 330 | if (authenticated) { |
331 | if (!(ent->flags & MON_AUTHDECIDE)) | |
332 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 333 | __func__, ent->type); |
1853d1ef | 334 | if (authctxt->pw->pw_uid == 0 && |
335 | !auth_root_allowed(auth_method)) | |
336 | authenticated = 0; | |
5b9e2464 | 337 | #ifdef USE_PAM |
338 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 339 | if (options.use_pam && authenticated) { |
5b9e2464 | 340 | Buffer m; |
341 | ||
342 | buffer_init(&m); | |
aff51935 | 343 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 344 | MONITOR_REQ_PAM_ACCOUNT, &m); |
345 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
346 | buffer_free(&m); | |
347 | } | |
348 | #endif | |
1853d1ef | 349 | } |
350 | ||
351 | if (ent->flags & MON_AUTHDECIDE) { | |
352 | auth_log(authctxt, authenticated, auth_method, | |
353 | compat20 ? " ssh2" : ""); | |
354 | if (!authenticated) | |
355 | authctxt->failures++; | |
356 | } | |
357 | } | |
358 | ||
359 | if (!authctxt->valid) | |
1588c277 | 360 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 361 | |
362 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 363 | __func__, authctxt->user); |
1853d1ef | 364 | |
b5a28cbc | 365 | mm_get_keystate(pmonitor); |
1853d1ef | 366 | } |
367 | ||
3a39206f | 368 | static void |
369 | monitor_set_child_handler(pid_t pid) | |
370 | { | |
371 | monitor_child_pid = pid; | |
372 | } | |
373 | ||
374 | static void | |
ca75d7de | 375 | monitor_child_handler(int sig) |
3a39206f | 376 | { |
ca75d7de | 377 | kill(monitor_child_pid, sig); |
3a39206f | 378 | } |
379 | ||
1853d1ef | 380 | void |
b5a28cbc | 381 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 382 | { |
3a39206f | 383 | monitor_set_child_handler(pmonitor->m_pid); |
384 | signal(SIGHUP, &monitor_child_handler); | |
385 | signal(SIGTERM, &monitor_child_handler); | |
386 | ||
1853d1ef | 387 | if (compat20) { |
388 | mon_dispatch = mon_dispatch_postauth20; | |
389 | ||
390 | /* Permit requests for moduli and signatures */ | |
391 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
392 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
393 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 394 | } else { |
395 | mon_dispatch = mon_dispatch_postauth15; | |
396 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
397 | } | |
398 | if (!no_pty_flag) { | |
399 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
400 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
401 | } | |
402 | ||
403 | for (;;) | |
b5a28cbc | 404 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 405 | } |
406 | ||
407 | void | |
b5a28cbc | 408 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 409 | { |
0496cf34 | 410 | if (options.compression) { |
411 | /* The member allocation is not visible, so sync it */ | |
412 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
413 | } | |
1853d1ef | 414 | } |
415 | ||
416 | int | |
b5a28cbc | 417 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 418 | struct mon_table **pent) |
419 | { | |
420 | Buffer m; | |
421 | int ret; | |
422 | u_char type; | |
423 | ||
424 | buffer_init(&m); | |
425 | ||
b5a28cbc | 426 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 427 | type = buffer_get_char(&m); |
428 | ||
1588c277 | 429 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 430 | |
431 | while (ent->f != NULL) { | |
432 | if (ent->type == type) | |
433 | break; | |
434 | ent++; | |
435 | } | |
436 | ||
437 | if (ent->f != NULL) { | |
438 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 439 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 440 | type); |
b5a28cbc | 441 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 442 | buffer_free(&m); |
443 | ||
444 | /* The child may use this request only once, disable it */ | |
445 | if (ent->flags & MON_ONCE) { | |
1588c277 | 446 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 447 | type); |
448 | ent->flags &= ~MON_PERMIT; | |
449 | } | |
450 | ||
451 | if (pent != NULL) | |
452 | *pent = ent; | |
453 | ||
454 | return ret; | |
455 | } | |
456 | ||
1588c277 | 457 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 458 | |
459 | /* NOTREACHED */ | |
460 | return (-1); | |
461 | } | |
462 | ||
463 | /* allowed key state */ | |
464 | static int | |
465 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
466 | { | |
467 | /* make sure key is allowed */ | |
468 | if (key_blob == NULL || key_bloblen != bloblen || | |
469 | memcmp(key_blob, blob, key_bloblen)) | |
470 | return (0); | |
471 | return (1); | |
472 | } | |
473 | ||
474 | static void | |
475 | monitor_reset_key_state(void) | |
476 | { | |
477 | /* reset state */ | |
478 | if (key_blob != NULL) | |
479 | xfree(key_blob); | |
480 | if (hostbased_cuser != NULL) | |
481 | xfree(hostbased_cuser); | |
482 | if (hostbased_chost != NULL) | |
483 | xfree(hostbased_chost); | |
484 | key_blob = NULL; | |
485 | key_bloblen = 0; | |
486 | key_blobtype = MM_NOKEY; | |
487 | hostbased_cuser = NULL; | |
488 | hostbased_chost = NULL; | |
489 | } | |
490 | ||
491 | int | |
ca75d7de | 492 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 493 | { |
494 | DH *dh; | |
495 | int min, want, max; | |
496 | ||
497 | min = buffer_get_int(m); | |
498 | want = buffer_get_int(m); | |
499 | max = buffer_get_int(m); | |
500 | ||
501 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 502 | __func__, min, want, max); |
1853d1ef | 503 | /* We need to check here, too, in case the child got corrupted */ |
504 | if (max < min || want < min || max < want) | |
505 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 506 | __func__, min, want, max); |
1853d1ef | 507 | |
508 | buffer_clear(m); | |
509 | ||
510 | dh = choose_dh(min, want, max); | |
511 | if (dh == NULL) { | |
512 | buffer_put_char(m, 0); | |
513 | return (0); | |
514 | } else { | |
515 | /* Send first bignum */ | |
516 | buffer_put_char(m, 1); | |
517 | buffer_put_bignum2(m, dh->p); | |
518 | buffer_put_bignum2(m, dh->g); | |
519 | ||
520 | DH_free(dh); | |
521 | } | |
ca75d7de | 522 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 523 | return (0); |
524 | } | |
525 | ||
526 | int | |
ca75d7de | 527 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 528 | { |
529 | Key *key; | |
530 | u_char *p; | |
531 | u_char *signature; | |
532 | u_int siglen, datlen; | |
533 | int keyid; | |
534 | ||
1588c277 | 535 | debug3("%s", __func__); |
1853d1ef | 536 | |
537 | keyid = buffer_get_int(m); | |
538 | p = buffer_get_string(m, &datlen); | |
539 | ||
540 | if (datlen != 20) | |
d1ff09ba | 541 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 542 | |
521d606b | 543 | /* save session id, it will be passed on the first call */ |
544 | if (session_id2_len == 0) { | |
545 | session_id2_len = datlen; | |
546 | session_id2 = xmalloc(session_id2_len); | |
547 | memcpy(session_id2, p, session_id2_len); | |
548 | } | |
549 | ||
1853d1ef | 550 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 551 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 552 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 553 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 554 | |
d1ff09ba | 555 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 556 | |
557 | buffer_clear(m); | |
558 | buffer_put_string(m, signature, siglen); | |
559 | ||
560 | xfree(p); | |
561 | xfree(signature); | |
562 | ||
ca75d7de | 563 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 564 | |
565 | /* Turn on permissions for getpwnam */ | |
566 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
567 | ||
568 | return (0); | |
569 | } | |
570 | ||
571 | /* Retrieves the password entry and also checks if the user is permitted */ | |
572 | ||
573 | int | |
ca75d7de | 574 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 575 | { |
18a8f313 | 576 | char *username; |
1853d1ef | 577 | struct passwd *pwent; |
578 | int allowed = 0; | |
579 | ||
1588c277 | 580 | debug3("%s", __func__); |
1853d1ef | 581 | |
582 | if (authctxt->attempt++ != 0) | |
1588c277 | 583 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 584 | |
18a8f313 | 585 | username = buffer_get_string(m, NULL); |
1853d1ef | 586 | |
18a8f313 | 587 | pwent = getpwnamallow(username); |
1853d1ef | 588 | |
18a8f313 | 589 | authctxt->user = xstrdup(username); |
590 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
591 | xfree(username); | |
1853d1ef | 592 | |
593 | buffer_clear(m); | |
594 | ||
595 | if (pwent == NULL) { | |
596 | buffer_put_char(m, 0); | |
b2a5802b | 597 | authctxt->pw = fakepw(); |
1853d1ef | 598 | goto out; |
599 | } | |
600 | ||
601 | allowed = 1; | |
602 | authctxt->pw = pwent; | |
603 | authctxt->valid = 1; | |
604 | ||
605 | buffer_put_char(m, 1); | |
606 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
607 | buffer_put_cstring(m, pwent->pw_name); | |
608 | buffer_put_cstring(m, "*"); | |
609 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 610 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 611 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 612 | #endif |
1853d1ef | 613 | buffer_put_cstring(m, pwent->pw_dir); |
614 | buffer_put_cstring(m, pwent->pw_shell); | |
615 | ||
616 | out: | |
1588c277 | 617 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 618 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 619 | |
620 | /* For SSHv1 allow authentication now */ | |
621 | if (!compat20) | |
622 | monitor_permit_authentications(1); | |
94a73cdc | 623 | else { |
1853d1ef | 624 | /* Allow service/style information on the auth context */ |
625 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 626 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
627 | } | |
1853d1ef | 628 | |
efe44db6 | 629 | #ifdef USE_PAM |
7fceb20d | 630 | if (options.use_pam) |
631 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 632 | #endif |
6039eeef | 633 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 634 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 635 | #endif |
1853d1ef | 636 | |
637 | return (0); | |
638 | } | |
639 | ||
ca75d7de | 640 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 641 | { |
642 | char *banner; | |
643 | ||
644 | buffer_clear(m); | |
645 | banner = auth2_read_banner(); | |
646 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 647 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 648 | |
649 | if (banner != NULL) | |
30e37ee6 | 650 | xfree(banner); |
94a73cdc | 651 | |
652 | return (0); | |
653 | } | |
654 | ||
1853d1ef | 655 | int |
ca75d7de | 656 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 657 | { |
658 | monitor_permit_authentications(1); | |
659 | ||
660 | authctxt->service = buffer_get_string(m, NULL); | |
661 | authctxt->style = buffer_get_string(m, NULL); | |
662 | debug3("%s: service=%s, style=%s", | |
1588c277 | 663 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 664 | |
665 | if (strlen(authctxt->style) == 0) { | |
666 | xfree(authctxt->style); | |
667 | authctxt->style = NULL; | |
668 | } | |
669 | ||
670 | return (0); | |
671 | } | |
672 | ||
673 | int | |
ca75d7de | 674 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 675 | { |
676 | static int call_count; | |
677 | char *passwd; | |
d341742a | 678 | int authenticated; |
679 | u_int plen; | |
1853d1ef | 680 | |
681 | passwd = buffer_get_string(m, &plen); | |
682 | /* Only authenticate if the context is valid */ | |
aa586f8e | 683 | authenticated = options.password_authentication && |
96d0bf74 | 684 | auth_password(authctxt, passwd); |
1853d1ef | 685 | memset(passwd, 0, strlen(passwd)); |
686 | xfree(passwd); | |
687 | ||
688 | buffer_clear(m); | |
689 | buffer_put_int(m, authenticated); | |
690 | ||
1588c277 | 691 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 692 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 693 | |
694 | call_count++; | |
695 | if (plen == 0 && call_count == 1) | |
696 | auth_method = "none"; | |
697 | else | |
698 | auth_method = "password"; | |
699 | ||
700 | /* Causes monitor loop to terminate if authenticated */ | |
701 | return (authenticated); | |
702 | } | |
703 | ||
704 | #ifdef BSD_AUTH | |
705 | int | |
ca75d7de | 706 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 707 | { |
708 | char *name, *infotxt; | |
709 | u_int numprompts; | |
710 | u_int *echo_on; | |
711 | char **prompts; | |
6d6c25e3 | 712 | u_int success; |
1853d1ef | 713 | |
6d6c25e3 | 714 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
715 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 716 | |
717 | buffer_clear(m); | |
6d6c25e3 | 718 | buffer_put_int(m, success); |
719 | if (success) | |
1853d1ef | 720 | buffer_put_cstring(m, prompts[0]); |
721 | ||
6d6c25e3 | 722 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 723 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 724 | |
6d6c25e3 | 725 | if (success) { |
1853d1ef | 726 | xfree(name); |
727 | xfree(infotxt); | |
728 | xfree(prompts); | |
729 | xfree(echo_on); | |
730 | } | |
731 | ||
732 | return (0); | |
733 | } | |
734 | ||
735 | int | |
ca75d7de | 736 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 737 | { |
738 | char *response; | |
739 | int authok; | |
740 | ||
741 | if (authctxt->as == 0) | |
1588c277 | 742 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 743 | |
744 | response = buffer_get_string(m, NULL); | |
aa586f8e | 745 | authok = options.challenge_response_authentication && |
746 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 747 | authctxt->as = NULL; |
1588c277 | 748 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 749 | xfree(response); |
750 | ||
751 | buffer_clear(m); | |
752 | buffer_put_int(m, authok); | |
753 | ||
1588c277 | 754 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 755 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 756 | |
757 | auth_method = "bsdauth"; | |
758 | ||
759 | return (authok != 0); | |
760 | } | |
761 | #endif | |
762 | ||
763 | #ifdef SKEY | |
764 | int | |
ca75d7de | 765 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 766 | { |
767 | struct skey skey; | |
768 | char challenge[1024]; | |
6d6c25e3 | 769 | u_int success; |
1853d1ef | 770 | |
f2b7b5c8 | 771 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
772 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 773 | |
774 | buffer_clear(m); | |
6d6c25e3 | 775 | buffer_put_int(m, success); |
776 | if (success) | |
1853d1ef | 777 | buffer_put_cstring(m, challenge); |
778 | ||
6d6c25e3 | 779 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 780 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 781 | |
782 | return (0); | |
783 | } | |
784 | ||
785 | int | |
ca75d7de | 786 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 787 | { |
788 | char *response; | |
789 | int authok; | |
790 | ||
791 | response = buffer_get_string(m, NULL); | |
792 | ||
aa586f8e | 793 | authok = (options.challenge_response_authentication && |
794 | authctxt->valid && | |
1853d1ef | 795 | skey_haskey(authctxt->pw->pw_name) == 0 && |
796 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
797 | ||
798 | xfree(response); | |
799 | ||
800 | buffer_clear(m); | |
801 | buffer_put_int(m, authok); | |
802 | ||
1588c277 | 803 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 804 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 805 | |
806 | auth_method = "skey"; | |
807 | ||
808 | return (authok != 0); | |
809 | } | |
810 | #endif | |
811 | ||
ad200abb | 812 | #ifdef USE_PAM |
813 | int | |
8b3ec5fd | 814 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 815 | { |
7fceb20d | 816 | if (!options.use_pam) |
817 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
818 | ||
529d73ab | 819 | start_pam(authctxt); |
ad200abb | 820 | |
5b9e2464 | 821 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
822 | ||
ad200abb | 823 | return (0); |
824 | } | |
05114c74 | 825 | |
5b9e2464 | 826 | int |
8b3ec5fd | 827 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 828 | { |
829 | u_int ret; | |
b6453d99 | 830 | |
5b9e2464 | 831 | if (!options.use_pam) |
832 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
833 | ||
834 | ret = do_pam_account(); | |
835 | ||
836 | buffer_put_int(m, ret); | |
ba6dd90e | 837 | buffer_append(&loginmsg, "\0", 1); |
838 | buffer_put_cstring(m, buffer_ptr(&loginmsg)); | |
839 | buffer_clear(&loginmsg); | |
5b9e2464 | 840 | |
8b3ec5fd | 841 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 842 | |
843 | return (ret); | |
844 | } | |
845 | ||
05114c74 | 846 | static void *sshpam_ctxt, *sshpam_authok; |
847 | extern KbdintDevice sshpam_device; | |
848 | ||
849 | int | |
8b3ec5fd | 850 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 851 | { |
852 | ||
853 | debug3("%s", __func__); | |
854 | authctxt->user = buffer_get_string(m, NULL); | |
855 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
856 | sshpam_authok = NULL; | |
857 | buffer_clear(m); | |
858 | if (sshpam_ctxt != NULL) { | |
859 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
860 | buffer_put_int(m, 1); | |
861 | } else { | |
862 | buffer_put_int(m, 0); | |
863 | } | |
8b3ec5fd | 864 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 865 | return (0); |
866 | } | |
867 | ||
868 | int | |
8b3ec5fd | 869 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 870 | { |
871 | char *name, *info, **prompts; | |
a1a073cc | 872 | u_int i, num, *echo_on; |
873 | int ret; | |
05114c74 | 874 | |
875 | debug3("%s", __func__); | |
876 | sshpam_authok = NULL; | |
877 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
878 | if (ret == 0 && num == 0) | |
879 | sshpam_authok = sshpam_ctxt; | |
880 | if (num > 1 || name == NULL || info == NULL) | |
881 | ret = -1; | |
882 | buffer_clear(m); | |
883 | buffer_put_int(m, ret); | |
884 | buffer_put_cstring(m, name); | |
885 | xfree(name); | |
886 | buffer_put_cstring(m, info); | |
887 | xfree(info); | |
888 | buffer_put_int(m, num); | |
889 | for (i = 0; i < num; ++i) { | |
890 | buffer_put_cstring(m, prompts[i]); | |
891 | xfree(prompts[i]); | |
892 | buffer_put_int(m, echo_on[i]); | |
893 | } | |
894 | if (prompts != NULL) | |
895 | xfree(prompts); | |
896 | if (echo_on != NULL) | |
897 | xfree(echo_on); | |
8b3ec5fd | 898 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 899 | return (0); |
900 | } | |
901 | ||
902 | int | |
8b3ec5fd | 903 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 904 | { |
905 | char **resp; | |
a1a073cc | 906 | u_int i, num; |
907 | int ret; | |
05114c74 | 908 | |
909 | debug3("%s", __func__); | |
910 | sshpam_authok = NULL; | |
911 | num = buffer_get_int(m); | |
912 | if (num > 0) { | |
913 | resp = xmalloc(num * sizeof(char *)); | |
914 | for (i = 0; i < num; ++i) | |
915 | resp[i] = buffer_get_string(m, NULL); | |
916 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
917 | for (i = 0; i < num; ++i) | |
918 | xfree(resp[i]); | |
919 | xfree(resp); | |
920 | } else { | |
921 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
922 | } | |
923 | buffer_clear(m); | |
924 | buffer_put_int(m, ret); | |
8b3ec5fd | 925 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 926 | auth_method = "keyboard-interactive/pam"; |
927 | if (ret == 0) | |
928 | sshpam_authok = sshpam_ctxt; | |
929 | return (0); | |
930 | } | |
931 | ||
932 | int | |
8b3ec5fd | 933 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 934 | { |
935 | ||
936 | debug3("%s", __func__); | |
937 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
938 | buffer_clear(m); | |
8b3ec5fd | 939 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
05114c74 | 940 | return (sshpam_authok == sshpam_ctxt); |
941 | } | |
ad200abb | 942 | #endif |
943 | ||
1853d1ef | 944 | static void |
945 | mm_append_debug(Buffer *m) | |
946 | { | |
947 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 948 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 949 | buffer_append(m, buffer_ptr(&auth_debug), |
950 | buffer_len(&auth_debug)); | |
951 | buffer_clear(&auth_debug); | |
952 | } | |
953 | } | |
954 | ||
955 | int | |
ca75d7de | 956 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 957 | { |
958 | Key *key; | |
661e45a0 | 959 | char *cuser, *chost; |
960 | u_char *blob; | |
1853d1ef | 961 | u_int bloblen; |
962 | enum mm_keytype type = 0; | |
963 | int allowed = 0; | |
964 | ||
1588c277 | 965 | debug3("%s entering", __func__); |
1853d1ef | 966 | |
967 | type = buffer_get_int(m); | |
968 | cuser = buffer_get_string(m, NULL); | |
969 | chost = buffer_get_string(m, NULL); | |
970 | blob = buffer_get_string(m, &bloblen); | |
971 | ||
972 | key = key_from_blob(blob, bloblen); | |
973 | ||
974 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
975 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 976 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 977 | |
1588c277 | 978 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 979 | |
fdaef11e | 980 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 981 | switch (type) { |
1853d1ef | 982 | case MM_USERKEY: |
aa586f8e | 983 | allowed = options.pubkey_authentication && |
984 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 985 | break; |
986 | case MM_HOSTKEY: | |
aa586f8e | 987 | allowed = options.hostbased_authentication && |
988 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 989 | cuser, chost, key); |
990 | break; | |
991 | case MM_RSAHOSTKEY: | |
992 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 993 | allowed = options.rhosts_rsa_authentication && |
994 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 995 | cuser, chost, key); |
996 | break; | |
997 | default: | |
1588c277 | 998 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 999 | break; |
1000 | } | |
1853d1ef | 1001 | } |
3e2f2431 | 1002 | if (key != NULL) |
1003 | key_free(key); | |
1853d1ef | 1004 | |
1005 | /* clear temporarily storage (used by verify) */ | |
1006 | monitor_reset_key_state(); | |
1007 | ||
1008 | if (allowed) { | |
1009 | /* Save temporarily for comparison in verify */ | |
1010 | key_blob = blob; | |
1011 | key_bloblen = bloblen; | |
1012 | key_blobtype = type; | |
1013 | hostbased_cuser = cuser; | |
1014 | hostbased_chost = chost; | |
1015 | } | |
1016 | ||
1017 | debug3("%s: key %p is %s", | |
1588c277 | 1018 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1019 | |
1020 | buffer_clear(m); | |
1021 | buffer_put_int(m, allowed); | |
92e15201 | 1022 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1023 | |
1024 | mm_append_debug(m); | |
1025 | ||
ca75d7de | 1026 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1027 | |
1028 | if (type == MM_RSAHOSTKEY) | |
1029 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1030 | ||
1031 | return (0); | |
1032 | } | |
1033 | ||
1034 | static int | |
1035 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1036 | { | |
1037 | Buffer b; | |
661e45a0 | 1038 | char *p; |
1853d1ef | 1039 | u_int len; |
1040 | int fail = 0; | |
1853d1ef | 1041 | |
1042 | buffer_init(&b); | |
1043 | buffer_append(&b, data, datalen); | |
1044 | ||
1045 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1046 | p = buffer_ptr(&b); |
1047 | len = buffer_len(&b); | |
1048 | if ((session_id2 == NULL) || | |
1049 | (len < session_id2_len) || | |
1050 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1051 | fail++; | |
1853d1ef | 1052 | buffer_consume(&b, session_id2_len); |
1053 | } else { | |
521d606b | 1054 | p = buffer_get_string(&b, &len); |
1055 | if ((session_id2 == NULL) || | |
1056 | (len != session_id2_len) || | |
1057 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1058 | fail++; |
521d606b | 1059 | xfree(p); |
1853d1ef | 1060 | } |
1061 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1062 | fail++; | |
1063 | p = buffer_get_string(&b, NULL); | |
1064 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1065 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1066 | authctxt->user, p); |
1067 | fail++; | |
1068 | } | |
1069 | xfree(p); | |
1070 | buffer_skip_string(&b); | |
1071 | if (datafellows & SSH_BUG_PKAUTH) { | |
1072 | if (!buffer_get_char(&b)) | |
1073 | fail++; | |
1074 | } else { | |
1075 | p = buffer_get_string(&b, NULL); | |
1076 | if (strcmp("publickey", p) != 0) | |
1077 | fail++; | |
1078 | xfree(p); | |
1079 | if (!buffer_get_char(&b)) | |
1080 | fail++; | |
1081 | buffer_skip_string(&b); | |
1082 | } | |
1083 | buffer_skip_string(&b); | |
1084 | if (buffer_len(&b) != 0) | |
1085 | fail++; | |
1086 | buffer_free(&b); | |
1087 | return (fail == 0); | |
1088 | } | |
1089 | ||
1090 | static int | |
661e45a0 | 1091 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1092 | char *chost) | |
1853d1ef | 1093 | { |
1094 | Buffer b; | |
661e45a0 | 1095 | char *p; |
1853d1ef | 1096 | u_int len; |
1097 | int fail = 0; | |
1853d1ef | 1098 | |
1099 | buffer_init(&b); | |
1100 | buffer_append(&b, data, datalen); | |
1101 | ||
521d606b | 1102 | p = buffer_get_string(&b, &len); |
1103 | if ((session_id2 == NULL) || | |
1104 | (len != session_id2_len) || | |
1105 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1106 | fail++; |
521d606b | 1107 | xfree(p); |
1108 | ||
1853d1ef | 1109 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1110 | fail++; | |
1111 | p = buffer_get_string(&b, NULL); | |
1112 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1113 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1114 | authctxt->user, p); |
1115 | fail++; | |
1116 | } | |
1117 | xfree(p); | |
1118 | buffer_skip_string(&b); /* service */ | |
1119 | p = buffer_get_string(&b, NULL); | |
1120 | if (strcmp(p, "hostbased") != 0) | |
1121 | fail++; | |
1122 | xfree(p); | |
1123 | buffer_skip_string(&b); /* pkalg */ | |
1124 | buffer_skip_string(&b); /* pkblob */ | |
1125 | ||
1126 | /* verify client host, strip trailing dot if necessary */ | |
1127 | p = buffer_get_string(&b, NULL); | |
1128 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1129 | p[len - 1] = '\0'; | |
1130 | if (strcmp(p, chost) != 0) | |
1131 | fail++; | |
1132 | xfree(p); | |
1133 | ||
1134 | /* verify client user */ | |
1135 | p = buffer_get_string(&b, NULL); | |
1136 | if (strcmp(p, cuser) != 0) | |
1137 | fail++; | |
1138 | xfree(p); | |
1139 | ||
1140 | if (buffer_len(&b) != 0) | |
1141 | fail++; | |
1142 | buffer_free(&b); | |
1143 | return (fail == 0); | |
1144 | } | |
1145 | ||
1146 | int | |
ca75d7de | 1147 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1148 | { |
1149 | Key *key; | |
1150 | u_char *signature, *data, *blob; | |
1151 | u_int signaturelen, datalen, bloblen; | |
1152 | int verified = 0; | |
1153 | int valid_data = 0; | |
1154 | ||
1155 | blob = buffer_get_string(m, &bloblen); | |
1156 | signature = buffer_get_string(m, &signaturelen); | |
1157 | data = buffer_get_string(m, &datalen); | |
1158 | ||
1159 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1160 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1161 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1162 | |
1163 | key = key_from_blob(blob, bloblen); | |
1164 | if (key == NULL) | |
1588c277 | 1165 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1166 | |
1167 | switch (key_blobtype) { | |
1168 | case MM_USERKEY: | |
1169 | valid_data = monitor_valid_userblob(data, datalen); | |
1170 | break; | |
1171 | case MM_HOSTKEY: | |
1172 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1173 | hostbased_cuser, hostbased_chost); | |
1174 | break; | |
1175 | default: | |
1176 | valid_data = 0; | |
1177 | break; | |
1178 | } | |
1179 | if (!valid_data) | |
1588c277 | 1180 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1181 | |
1182 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1183 | debug3("%s: key %p signature %s", | |
1588c277 | 1184 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1185 | |
1186 | key_free(key); | |
1187 | xfree(blob); | |
1188 | xfree(signature); | |
1189 | xfree(data); | |
1190 | ||
d17ef027 | 1191 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1192 | ||
1853d1ef | 1193 | monitor_reset_key_state(); |
1194 | ||
1195 | buffer_clear(m); | |
1196 | buffer_put_int(m, verified); | |
ca75d7de | 1197 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1198 | |
1853d1ef | 1199 | return (verified); |
1200 | } | |
1201 | ||
1202 | static void | |
1203 | mm_record_login(Session *s, struct passwd *pw) | |
1204 | { | |
1205 | socklen_t fromlen; | |
1206 | struct sockaddr_storage from; | |
1207 | ||
1208 | /* | |
1209 | * Get IP address of client. If the connection is not a socket, let | |
1210 | * the address be 0.0.0.0. | |
1211 | */ | |
1212 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1213 | fromlen = sizeof(from); |
1853d1ef | 1214 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1215 | if (getpeername(packet_get_connection_in(), |
1216 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1217 | debug("getpeername: %.100s", strerror(errno)); | |
2362db19 | 1218 | cleanup_exit(255); |
1853d1ef | 1219 | } |
1220 | } | |
1221 | /* Record that there was a login on that tty from the remote host. */ | |
1222 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1223 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1224 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1225 | } |
1226 | ||
1227 | static void | |
1228 | mm_session_close(Session *s) | |
1229 | { | |
b9ed513a | 1230 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1231 | if (s->ttyfd != -1) { |
1588c277 | 1232 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1233 | session_pty_cleanup2(s); |
1234 | } | |
1235 | s->used = 0; | |
1236 | } | |
1237 | ||
1238 | int | |
ca75d7de | 1239 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1240 | { |
b5a28cbc | 1241 | extern struct monitor *pmonitor; |
1853d1ef | 1242 | Session *s; |
1243 | int res, fd0; | |
1244 | ||
1588c277 | 1245 | debug3("%s entering", __func__); |
1853d1ef | 1246 | |
1247 | buffer_clear(m); | |
1248 | s = session_new(); | |
1249 | if (s == NULL) | |
1250 | goto error; | |
1251 | s->authctxt = authctxt; | |
1252 | s->pw = authctxt->pw; | |
b5a28cbc | 1253 | s->pid = pmonitor->m_pid; |
1853d1ef | 1254 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1255 | if (res == 0) | |
1256 | goto error; | |
1853d1ef | 1257 | pty_setowner(authctxt->pw, s->tty); |
1258 | ||
1259 | buffer_put_int(m, 1); | |
1260 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1261 | |
1262 | /* We need to trick ttyslot */ | |
1263 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1264 | fatal("%s: dup2", __func__); |
1853d1ef | 1265 | |
1266 | mm_record_login(s, authctxt->pw); | |
1267 | ||
1268 | /* Now we can close the file descriptor again */ | |
1269 | close(0); | |
1270 | ||
be2ca0c9 | 1271 | /* send messages generated by record_login */ |
1272 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1273 | buffer_clear(&loginmsg); | |
1274 | ||
1275 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1276 | ||
1277 | mm_send_fd(sock, s->ptyfd); | |
1278 | mm_send_fd(sock, s->ttyfd); | |
1279 | ||
1853d1ef | 1280 | /* make sure nothing uses fd 0 */ |
1281 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1282 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1283 | if (fd0 != 0) |
1588c277 | 1284 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1285 | |
1286 | /* slave is not needed */ | |
1287 | close(s->ttyfd); | |
1288 | s->ttyfd = s->ptyfd; | |
1289 | /* no need to dup() because nobody closes ptyfd */ | |
1290 | s->ptymaster = s->ptyfd; | |
1291 | ||
1588c277 | 1292 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1293 | |
1294 | return (0); | |
1295 | ||
1296 | error: | |
1297 | if (s != NULL) | |
1298 | mm_session_close(s); | |
1299 | buffer_put_int(m, 0); | |
ca75d7de | 1300 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1301 | return (0); |
1302 | } | |
1303 | ||
1304 | int | |
ca75d7de | 1305 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1306 | { |
1307 | Session *s; | |
1308 | char *tty; | |
1309 | ||
1588c277 | 1310 | debug3("%s entering", __func__); |
1853d1ef | 1311 | |
1312 | tty = buffer_get_string(m, NULL); | |
1313 | if ((s = session_by_tty(tty)) != NULL) | |
1314 | mm_session_close(s); | |
1315 | buffer_clear(m); | |
1316 | xfree(tty); | |
1317 | return (0); | |
1318 | } | |
1319 | ||
1320 | int | |
ca75d7de | 1321 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1322 | { |
1323 | BIGNUM *p; | |
1324 | int rsafail; | |
1325 | ||
1326 | /* Turn off permissions */ | |
75cccc2c | 1327 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1328 | |
1329 | if ((p = BN_new()) == NULL) | |
1588c277 | 1330 | fatal("%s: BN_new", __func__); |
1853d1ef | 1331 | |
1332 | buffer_get_bignum2(m, p); | |
1333 | ||
1334 | rsafail = ssh1_session_key(p); | |
1335 | ||
1336 | buffer_clear(m); | |
1337 | buffer_put_int(m, rsafail); | |
1338 | buffer_put_bignum2(m, p); | |
1339 | ||
1340 | BN_clear_free(p); | |
1341 | ||
ca75d7de | 1342 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1343 | |
1344 | /* Turn on permissions for sessid passing */ | |
1345 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1346 | ||
1347 | return (0); | |
1348 | } | |
1349 | ||
1350 | int | |
ca75d7de | 1351 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1352 | { |
1353 | int i; | |
1354 | ||
1588c277 | 1355 | debug3("%s entering", __func__); |
1853d1ef | 1356 | |
1357 | if (buffer_len(m) != 16) | |
1588c277 | 1358 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1359 | for (i = 0; i < 16; i++) |
1360 | session_id[i] = buffer_get_char(m); | |
1361 | ||
1362 | /* Turn on permissions for getpwnam */ | |
1363 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1364 | ||
1365 | return (0); | |
1366 | } | |
1367 | ||
1368 | int | |
ca75d7de | 1369 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1370 | { |
1371 | BIGNUM *client_n; | |
1372 | Key *key = NULL; | |
1373 | u_char *blob = NULL; | |
1374 | u_int blen = 0; | |
1375 | int allowed = 0; | |
1376 | ||
1588c277 | 1377 | debug3("%s entering", __func__); |
1853d1ef | 1378 | |
aa586f8e | 1379 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1380 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1381 | fatal("%s: BN_new", __func__); |
1853d1ef | 1382 | buffer_get_bignum2(m, client_n); |
1383 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1384 | BN_clear_free(client_n); | |
1385 | } | |
1386 | buffer_clear(m); | |
1387 | buffer_put_int(m, allowed); | |
92e15201 | 1388 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1389 | |
1390 | /* clear temporarily storage (used by generate challenge) */ | |
1391 | monitor_reset_key_state(); | |
1392 | ||
1393 | if (allowed && key != NULL) { | |
1394 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1395 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1396 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1397 | buffer_put_string(m, blob, blen); |
1398 | ||
1399 | /* Save temporarily for comparison in verify */ | |
1400 | key_blob = blob; | |
1401 | key_bloblen = blen; | |
1402 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1403 | } |
3e2f2431 | 1404 | if (key != NULL) |
1405 | key_free(key); | |
1853d1ef | 1406 | |
1407 | mm_append_debug(m); | |
1408 | ||
ca75d7de | 1409 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1410 | |
1411 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1412 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1413 | return (0); | |
1414 | } | |
1415 | ||
1416 | int | |
ca75d7de | 1417 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1418 | { |
1419 | Key *key = NULL; | |
1420 | u_char *blob; | |
1421 | u_int blen; | |
1422 | ||
1588c277 | 1423 | debug3("%s entering", __func__); |
1853d1ef | 1424 | |
1425 | if (!authctxt->valid) | |
1588c277 | 1426 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1427 | blob = buffer_get_string(m, &blen); |
1428 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1429 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1430 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1431 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1432 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1433 | fatal("%s: received bad key", __func__); |
1853d1ef | 1434 | |
1435 | if (ssh1_challenge) | |
1436 | BN_clear_free(ssh1_challenge); | |
1437 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1438 | ||
1439 | buffer_clear(m); | |
1440 | buffer_put_bignum2(m, ssh1_challenge); | |
1441 | ||
1588c277 | 1442 | debug3("%s sending reply", __func__); |
ca75d7de | 1443 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1444 | |
1445 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1446 | |
1447 | xfree(blob); | |
1448 | key_free(key); | |
1853d1ef | 1449 | return (0); |
1450 | } | |
1451 | ||
1452 | int | |
ca75d7de | 1453 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1454 | { |
1455 | Key *key = NULL; | |
1456 | u_char *blob, *response; | |
1457 | u_int blen, len; | |
1458 | int success; | |
1459 | ||
1588c277 | 1460 | debug3("%s entering", __func__); |
1853d1ef | 1461 | |
1462 | if (!authctxt->valid) | |
1588c277 | 1463 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1464 | if (ssh1_challenge == NULL) |
1588c277 | 1465 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1466 | |
1467 | blob = buffer_get_string(m, &blen); | |
1468 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1469 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1470 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1471 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1472 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1473 | fatal("%s: received bad key", __func__); |
1853d1ef | 1474 | response = buffer_get_string(m, &len); |
1475 | if (len != 16) | |
1588c277 | 1476 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1477 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1478 | ||
3e2f2431 | 1479 | xfree(blob); |
1853d1ef | 1480 | key_free(key); |
1481 | xfree(response); | |
1482 | ||
1483 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1484 | ||
1485 | /* reset state */ | |
1486 | BN_clear_free(ssh1_challenge); | |
1487 | ssh1_challenge = NULL; | |
1488 | monitor_reset_key_state(); | |
1489 | ||
1490 | buffer_clear(m); | |
1491 | buffer_put_int(m, success); | |
ca75d7de | 1492 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1493 | |
1494 | return (success); | |
1495 | } | |
1496 | ||
1497 | int | |
ca75d7de | 1498 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1499 | { |
b5a28cbc | 1500 | extern struct monitor *pmonitor; |
1853d1ef | 1501 | int res, status; |
1502 | ||
1588c277 | 1503 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1504 | |
1505 | /* The child is terminating */ | |
1506 | session_destroy_all(&mm_session_close); | |
1507 | ||
b5a28cbc | 1508 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1509 | if (errno != EINTR) |
1510 | exit(1); | |
1853d1ef | 1511 | |
1512 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1513 | ||
1514 | /* Terminate process */ | |
f6be21a0 | 1515 | exit(res); |
1853d1ef | 1516 | } |
1517 | ||
6039eeef | 1518 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1519 | /* Report that an audit event occurred */ |
1520 | int | |
1521 | mm_answer_audit_event(int socket, Buffer *m) | |
1522 | { | |
1523 | ssh_audit_event_t event; | |
1524 | ||
1525 | debug3("%s entering", __func__); | |
1526 | ||
1527 | event = buffer_get_int(m); | |
c00e4d75 | 1528 | switch(event) { |
6039eeef | 1529 | case SSH_AUTH_FAIL_PUBKEY: |
1530 | case SSH_AUTH_FAIL_HOSTBASED: | |
1531 | case SSH_AUTH_FAIL_GSSAPI: | |
1532 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1533 | case SSH_LOGIN_ROOT_DENIED: | |
1534 | case SSH_CONNECTION_CLOSE: | |
1535 | case SSH_INVALID_USER: | |
c00e4d75 | 1536 | audit_event(event); |
1537 | break; | |
1538 | default: | |
1539 | fatal("Audit event type %d not permitted", event); | |
1540 | } | |
1541 | ||
1542 | return (0); | |
1543 | } | |
1544 | ||
1545 | int | |
1546 | mm_answer_audit_command(int socket, Buffer *m) | |
1547 | { | |
1548 | u_int len; | |
1549 | char *cmd; | |
1550 | ||
1551 | debug3("%s entering", __func__); | |
1552 | cmd = buffer_get_string(m, &len); | |
1553 | /* sanity check command, if so how? */ | |
1554 | audit_run_command(cmd); | |
1555 | xfree(cmd); | |
c00e4d75 | 1556 | return (0); |
1557 | } | |
6039eeef | 1558 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1559 | |
1853d1ef | 1560 | void |
b5a28cbc | 1561 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1562 | { |
1563 | if (compat20) { | |
1564 | set_newkeys(MODE_IN); | |
1565 | set_newkeys(MODE_OUT); | |
1566 | } else { | |
1853d1ef | 1567 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1568 | packet_set_encryption_key(child_state.ssh1key, |
1569 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1570 | xfree(child_state.ssh1key); | |
1853d1ef | 1571 | } |
1572 | ||
9459414c | 1573 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1574 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1575 | xfree(child_state.keyout); | |
1576 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1577 | xfree(child_state.keyin); | |
1578 | ||
1579 | if (!compat20) { | |
1580 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1581 | xfree(child_state.ivout); | |
1582 | packet_set_iv(MODE_IN, child_state.ivin); | |
1583 | xfree(child_state.ivin); | |
1584 | } | |
1585 | ||
1586 | memcpy(&incoming_stream, &child_state.incoming, | |
1587 | sizeof(incoming_stream)); | |
1588 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1589 | sizeof(outgoing_stream)); | |
1590 | ||
1591 | /* Update with new address */ | |
0496cf34 | 1592 | if (options.compression) |
1593 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1594 | |
1595 | /* Network I/O buffers */ | |
1596 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1597 | buffer_clear(&input); | |
1598 | buffer_append(&input, child_state.input, child_state.ilen); | |
1599 | memset(child_state.input, 0, child_state.ilen); | |
1600 | xfree(child_state.input); | |
1601 | ||
1602 | buffer_clear(&output); | |
1603 | buffer_append(&output, child_state.output, child_state.olen); | |
1604 | memset(child_state.output, 0, child_state.olen); | |
1605 | xfree(child_state.output); | |
1606 | } | |
1607 | ||
1608 | static Kex * | |
1609 | mm_get_kex(Buffer *m) | |
1610 | { | |
1611 | Kex *kex; | |
1612 | void *blob; | |
1613 | u_int bloblen; | |
1614 | ||
1615 | kex = xmalloc(sizeof(*kex)); | |
1616 | memset(kex, 0, sizeof(*kex)); | |
1617 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1618 | if ((session_id2 == NULL) || |
1619 | (kex->session_id_len != session_id2_len) || | |
1620 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1621 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1622 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1623 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1624 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1625 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
1853d1ef | 1626 | kex->server = 1; |
1627 | kex->hostkey_type = buffer_get_int(m); | |
1628 | kex->kex_type = buffer_get_int(m); | |
1629 | blob = buffer_get_string(m, &bloblen); | |
1630 | buffer_init(&kex->my); | |
1631 | buffer_append(&kex->my, blob, bloblen); | |
1632 | xfree(blob); | |
1633 | blob = buffer_get_string(m, &bloblen); | |
1634 | buffer_init(&kex->peer); | |
1635 | buffer_append(&kex->peer, blob, bloblen); | |
1636 | xfree(blob); | |
1637 | kex->done = 1; | |
1638 | kex->flags = buffer_get_int(m); | |
1639 | kex->client_version_string = buffer_get_string(m, NULL); | |
1640 | kex->server_version_string = buffer_get_string(m, NULL); | |
1641 | kex->load_host_key=&get_hostkey_by_type; | |
1642 | kex->host_key_index=&get_hostkey_index; | |
1643 | ||
1644 | return (kex); | |
1645 | } | |
1646 | ||
1647 | /* This function requries careful sanity checking */ | |
1648 | ||
1649 | void | |
b5a28cbc | 1650 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1651 | { |
1652 | Buffer m; | |
1653 | u_char *blob, *p; | |
1654 | u_int bloblen, plen; | |
ffd7b36b | 1655 | u_int32_t seqnr, packets; |
1656 | u_int64_t blocks; | |
1853d1ef | 1657 | |
1588c277 | 1658 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1659 | |
1660 | buffer_init(&m); | |
b5a28cbc | 1661 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1662 | if (!compat20) { |
1663 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1664 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1665 | child_state.ssh1key = buffer_get_string(&m, |
1666 | &child_state.ssh1keylen); | |
1853d1ef | 1667 | child_state.ivout = buffer_get_string(&m, |
1668 | &child_state.ivoutlen); | |
1669 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1670 | goto skip; | |
1671 | } else { | |
1672 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1673 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1674 | } |
1675 | ||
1676 | blob = buffer_get_string(&m, &bloblen); | |
1677 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1678 | xfree(blob); | |
1679 | ||
1588c277 | 1680 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1681 | blob = buffer_get_string(&m, &bloblen); |
1682 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1683 | xfree(blob); | |
1684 | ||
1685 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1686 | seqnr = buffer_get_int(&m); |
1687 | blocks = buffer_get_int64(&m); | |
1688 | packets = buffer_get_int(&m); | |
1689 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1690 | seqnr = buffer_get_int(&m); | |
1691 | blocks = buffer_get_int64(&m); | |
1692 | packets = buffer_get_int(&m); | |
1693 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1694 | |
1695 | skip: | |
1696 | /* Get the key context */ | |
1697 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1698 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1699 | ||
1588c277 | 1700 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1701 | /* Get compression state */ |
1702 | p = buffer_get_string(&m, &plen); | |
1703 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1704 | fatal("%s: bad request size", __func__); |
1853d1ef | 1705 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1706 | xfree(p); | |
1707 | ||
1708 | p = buffer_get_string(&m, &plen); | |
1709 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1710 | fatal("%s: bad request size", __func__); |
1853d1ef | 1711 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1712 | xfree(p); | |
1713 | ||
1714 | /* Network I/O buffers */ | |
1588c277 | 1715 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1716 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1717 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1718 | ||
1719 | buffer_free(&m); | |
1720 | } | |
1721 | ||
1722 | ||
1723 | /* Allocation functions for zlib */ | |
1724 | void * | |
1725 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1726 | { | |
39e71188 | 1727 | size_t len = (size_t) size * ncount; |
1853d1ef | 1728 | void *address; |
1729 | ||
b85698ab | 1730 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1731 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1732 | ||
1733 | address = mm_malloc(mm, len); | |
1853d1ef | 1734 | |
1735 | return (address); | |
1736 | } | |
1737 | ||
1738 | void | |
1739 | mm_zfree(struct mm_master *mm, void *address) | |
1740 | { | |
1741 | mm_free(mm, address); | |
1742 | } | |
1743 | ||
1744 | void | |
1745 | mm_init_compression(struct mm_master *mm) | |
1746 | { | |
1747 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1748 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1749 | outgoing_stream.opaque = mm; | |
1750 | ||
1751 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1752 | incoming_stream.zfree = (free_func)mm_zfree; | |
1753 | incoming_stream.opaque = mm; | |
1754 | } | |
1755 | ||
1756 | /* XXX */ | |
1757 | ||
1758 | #define FD_CLOSEONEXEC(x) do { \ | |
1759 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1760 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1761 | } while (0) | |
1762 | ||
1763 | static void | |
1764 | monitor_socketpair(int *pair) | |
1765 | { | |
f1af2dbf | 1766 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1767 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1768 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1769 | #else |
1770 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1771 | __func__); |
f1af2dbf | 1772 | #endif |
1853d1ef | 1773 | FD_CLOSEONEXEC(pair[0]); |
1774 | FD_CLOSEONEXEC(pair[1]); | |
1775 | } | |
1776 | ||
1777 | #define MM_MEMSIZE 65536 | |
1778 | ||
1779 | struct monitor * | |
1780 | monitor_init(void) | |
1781 | { | |
1782 | struct monitor *mon; | |
1783 | int pair[2]; | |
1784 | ||
1785 | mon = xmalloc(sizeof(*mon)); | |
1786 | ||
a9b33b95 | 1787 | mon->m_pid = 0; |
1853d1ef | 1788 | monitor_socketpair(pair); |
1789 | ||
1790 | mon->m_recvfd = pair[0]; | |
1791 | mon->m_sendfd = pair[1]; | |
1792 | ||
1793 | /* Used to share zlib space across processes */ | |
0496cf34 | 1794 | if (options.compression) { |
1795 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1796 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1797 | |
0496cf34 | 1798 | /* Compression needs to share state across borders */ |
1799 | mm_init_compression(mon->m_zlib); | |
1800 | } | |
1853d1ef | 1801 | |
1802 | return mon; | |
1803 | } | |
1804 | ||
1805 | void | |
1806 | monitor_reinit(struct monitor *mon) | |
1807 | { | |
1808 | int pair[2]; | |
1809 | ||
1810 | monitor_socketpair(pair); | |
1811 | ||
1812 | mon->m_recvfd = pair[0]; | |
1813 | mon->m_sendfd = pair[1]; | |
1814 | } | |
7364bd04 | 1815 | |
1816 | #ifdef GSSAPI | |
1817 | int | |
ca75d7de | 1818 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1819 | { |
ca75d7de | 1820 | gss_OID_desc goid; |
7364bd04 | 1821 | OM_uint32 major; |
1822 | u_int len; | |
1823 | ||
ca75d7de | 1824 | goid.elements = buffer_get_string(m, &len); |
1825 | goid.length = len; | |
7364bd04 | 1826 | |
ca75d7de | 1827 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1828 | |
ca75d7de | 1829 | xfree(goid.elements); |
7364bd04 | 1830 | |
1831 | buffer_clear(m); | |
1832 | buffer_put_int(m, major); | |
1833 | ||
ca75d7de | 1834 | mm_request_send(sock,MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1835 | |
1836 | /* Now we have a context, enable the step */ | |
1837 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1838 | ||
1839 | return (0); | |
1840 | } | |
1841 | ||
1842 | int | |
ca75d7de | 1843 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1844 | { |
1845 | gss_buffer_desc in; | |
1846 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1847 | OM_uint32 major,minor; | |
1848 | OM_uint32 flags = 0; /* GSI needs this */ | |
f99e1ca4 | 1849 | u_int len; |
7364bd04 | 1850 | |
f99e1ca4 | 1851 | in.value = buffer_get_string(m, &len); |
1852 | in.length = len; | |
7364bd04 | 1853 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1854 | xfree(in.value); | |
1855 | ||
1856 | buffer_clear(m); | |
1857 | buffer_put_int(m, major); | |
1858 | buffer_put_string(m, out.value, out.length); | |
1859 | buffer_put_int(m, flags); | |
ca75d7de | 1860 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1861 | |
1862 | gss_release_buffer(&minor, &out); | |
1863 | ||
7364bd04 | 1864 | if (major==GSS_S_COMPLETE) { |
1865 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); | |
1866 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1867 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1868 | } |
1869 | return (0); | |
1870 | } | |
1871 | ||
0789992b | 1872 | int |
ca75d7de | 1873 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1874 | { |
1875 | gss_buffer_desc gssbuf, mic; | |
1876 | OM_uint32 ret; | |
1877 | u_int len; | |
b6453d99 | 1878 | |
0789992b | 1879 | gssbuf.value = buffer_get_string(m, &len); |
1880 | gssbuf.length = len; | |
1881 | mic.value = buffer_get_string(m, &len); | |
1882 | mic.length = len; | |
b6453d99 | 1883 | |
0789992b | 1884 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1885 | |
0789992b | 1886 | xfree(gssbuf.value); |
1887 | xfree(mic.value); | |
b6453d99 | 1888 | |
0789992b | 1889 | buffer_clear(m); |
1890 | buffer_put_int(m, ret); | |
b6453d99 | 1891 | |
ca75d7de | 1892 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1893 | |
0789992b | 1894 | if (!GSS_ERROR(ret)) |
1895 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1896 | |
0789992b | 1897 | return (0); |
1898 | } | |
1899 | ||
7364bd04 | 1900 | int |
ca75d7de | 1901 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1902 | { |
1903 | int authenticated; | |
1904 | ||
1905 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1906 | ||
1907 | buffer_clear(m); | |
1908 | buffer_put_int(m, authenticated); | |
1909 | ||
1910 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1911 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1912 | |
0789992b | 1913 | auth_method="gssapi-with-mic"; |
7364bd04 | 1914 | |
1915 | /* Monitor loop will terminate if authenticated */ | |
1916 | return (authenticated); | |
1917 | } | |
1918 | #endif /* GSSAPI */ |