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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" | |
8442cc66 | 28 | RCSID("$OpenBSD: monitor.c,v 1.64 2005/10/13 22:24:31 stevesk 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); | |
cfb60d3a | 837 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 838 | |
8b3ec5fd | 839 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 840 | |
841 | return (ret); | |
842 | } | |
843 | ||
05114c74 | 844 | static void *sshpam_ctxt, *sshpam_authok; |
845 | extern KbdintDevice sshpam_device; | |
846 | ||
847 | int | |
8b3ec5fd | 848 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 849 | { |
850 | ||
851 | debug3("%s", __func__); | |
852 | authctxt->user = buffer_get_string(m, NULL); | |
853 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
854 | sshpam_authok = NULL; | |
855 | buffer_clear(m); | |
856 | if (sshpam_ctxt != NULL) { | |
857 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
858 | buffer_put_int(m, 1); | |
859 | } else { | |
860 | buffer_put_int(m, 0); | |
861 | } | |
8b3ec5fd | 862 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 863 | return (0); |
864 | } | |
865 | ||
866 | int | |
8b3ec5fd | 867 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 868 | { |
869 | char *name, *info, **prompts; | |
a1a073cc | 870 | u_int i, num, *echo_on; |
871 | int ret; | |
05114c74 | 872 | |
873 | debug3("%s", __func__); | |
874 | sshpam_authok = NULL; | |
875 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
876 | if (ret == 0 && num == 0) | |
877 | sshpam_authok = sshpam_ctxt; | |
878 | if (num > 1 || name == NULL || info == NULL) | |
879 | ret = -1; | |
880 | buffer_clear(m); | |
881 | buffer_put_int(m, ret); | |
882 | buffer_put_cstring(m, name); | |
883 | xfree(name); | |
884 | buffer_put_cstring(m, info); | |
885 | xfree(info); | |
886 | buffer_put_int(m, num); | |
887 | for (i = 0; i < num; ++i) { | |
888 | buffer_put_cstring(m, prompts[i]); | |
889 | xfree(prompts[i]); | |
890 | buffer_put_int(m, echo_on[i]); | |
891 | } | |
892 | if (prompts != NULL) | |
893 | xfree(prompts); | |
894 | if (echo_on != NULL) | |
895 | xfree(echo_on); | |
8b3ec5fd | 896 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 897 | return (0); |
898 | } | |
899 | ||
900 | int | |
8b3ec5fd | 901 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 902 | { |
903 | char **resp; | |
a1a073cc | 904 | u_int i, num; |
905 | int ret; | |
05114c74 | 906 | |
907 | debug3("%s", __func__); | |
908 | sshpam_authok = NULL; | |
909 | num = buffer_get_int(m); | |
910 | if (num > 0) { | |
911 | resp = xmalloc(num * sizeof(char *)); | |
912 | for (i = 0; i < num; ++i) | |
913 | resp[i] = buffer_get_string(m, NULL); | |
914 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
915 | for (i = 0; i < num; ++i) | |
916 | xfree(resp[i]); | |
917 | xfree(resp); | |
918 | } else { | |
919 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
920 | } | |
921 | buffer_clear(m); | |
922 | buffer_put_int(m, ret); | |
8b3ec5fd | 923 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 924 | auth_method = "keyboard-interactive/pam"; |
925 | if (ret == 0) | |
926 | sshpam_authok = sshpam_ctxt; | |
927 | return (0); | |
928 | } | |
929 | ||
930 | int | |
8b3ec5fd | 931 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 932 | { |
933 | ||
934 | debug3("%s", __func__); | |
935 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
936 | buffer_clear(m); | |
8b3ec5fd | 937 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
05114c74 | 938 | return (sshpam_authok == sshpam_ctxt); |
939 | } | |
ad200abb | 940 | #endif |
941 | ||
1853d1ef | 942 | static void |
943 | mm_append_debug(Buffer *m) | |
944 | { | |
945 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 946 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 947 | buffer_append(m, buffer_ptr(&auth_debug), |
948 | buffer_len(&auth_debug)); | |
949 | buffer_clear(&auth_debug); | |
950 | } | |
951 | } | |
952 | ||
953 | int | |
ca75d7de | 954 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 955 | { |
956 | Key *key; | |
661e45a0 | 957 | char *cuser, *chost; |
958 | u_char *blob; | |
1853d1ef | 959 | u_int bloblen; |
960 | enum mm_keytype type = 0; | |
961 | int allowed = 0; | |
962 | ||
1588c277 | 963 | debug3("%s entering", __func__); |
1853d1ef | 964 | |
965 | type = buffer_get_int(m); | |
966 | cuser = buffer_get_string(m, NULL); | |
967 | chost = buffer_get_string(m, NULL); | |
968 | blob = buffer_get_string(m, &bloblen); | |
969 | ||
970 | key = key_from_blob(blob, bloblen); | |
971 | ||
972 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
973 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 974 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 975 | |
1588c277 | 976 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 977 | |
fdaef11e | 978 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 979 | switch (type) { |
1853d1ef | 980 | case MM_USERKEY: |
aa586f8e | 981 | allowed = options.pubkey_authentication && |
982 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 983 | break; |
984 | case MM_HOSTKEY: | |
aa586f8e | 985 | allowed = options.hostbased_authentication && |
986 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 987 | cuser, chost, key); |
988 | break; | |
989 | case MM_RSAHOSTKEY: | |
990 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 991 | allowed = options.rhosts_rsa_authentication && |
992 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 993 | cuser, chost, key); |
994 | break; | |
995 | default: | |
1588c277 | 996 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 997 | break; |
998 | } | |
1853d1ef | 999 | } |
3e2f2431 | 1000 | if (key != NULL) |
1001 | key_free(key); | |
1853d1ef | 1002 | |
1003 | /* clear temporarily storage (used by verify) */ | |
1004 | monitor_reset_key_state(); | |
1005 | ||
1006 | if (allowed) { | |
1007 | /* Save temporarily for comparison in verify */ | |
1008 | key_blob = blob; | |
1009 | key_bloblen = bloblen; | |
1010 | key_blobtype = type; | |
1011 | hostbased_cuser = cuser; | |
1012 | hostbased_chost = chost; | |
1013 | } | |
1014 | ||
1015 | debug3("%s: key %p is %s", | |
1588c277 | 1016 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1017 | |
1018 | buffer_clear(m); | |
1019 | buffer_put_int(m, allowed); | |
92e15201 | 1020 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1021 | |
1022 | mm_append_debug(m); | |
1023 | ||
ca75d7de | 1024 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1025 | |
1026 | if (type == MM_RSAHOSTKEY) | |
1027 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1028 | ||
1029 | return (0); | |
1030 | } | |
1031 | ||
1032 | static int | |
1033 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1034 | { | |
1035 | Buffer b; | |
661e45a0 | 1036 | char *p; |
1853d1ef | 1037 | u_int len; |
1038 | int fail = 0; | |
1853d1ef | 1039 | |
1040 | buffer_init(&b); | |
1041 | buffer_append(&b, data, datalen); | |
1042 | ||
1043 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1044 | p = buffer_ptr(&b); |
1045 | len = buffer_len(&b); | |
1046 | if ((session_id2 == NULL) || | |
1047 | (len < session_id2_len) || | |
1048 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1049 | fail++; | |
1853d1ef | 1050 | buffer_consume(&b, session_id2_len); |
1051 | } else { | |
521d606b | 1052 | p = buffer_get_string(&b, &len); |
1053 | if ((session_id2 == NULL) || | |
1054 | (len != session_id2_len) || | |
1055 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1056 | fail++; |
521d606b | 1057 | xfree(p); |
1853d1ef | 1058 | } |
1059 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1060 | fail++; | |
1061 | p = buffer_get_string(&b, NULL); | |
1062 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1063 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1064 | authctxt->user, p); |
1065 | fail++; | |
1066 | } | |
1067 | xfree(p); | |
1068 | buffer_skip_string(&b); | |
1069 | if (datafellows & SSH_BUG_PKAUTH) { | |
1070 | if (!buffer_get_char(&b)) | |
1071 | fail++; | |
1072 | } else { | |
1073 | p = buffer_get_string(&b, NULL); | |
1074 | if (strcmp("publickey", p) != 0) | |
1075 | fail++; | |
1076 | xfree(p); | |
1077 | if (!buffer_get_char(&b)) | |
1078 | fail++; | |
1079 | buffer_skip_string(&b); | |
1080 | } | |
1081 | buffer_skip_string(&b); | |
1082 | if (buffer_len(&b) != 0) | |
1083 | fail++; | |
1084 | buffer_free(&b); | |
1085 | return (fail == 0); | |
1086 | } | |
1087 | ||
1088 | static int | |
661e45a0 | 1089 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1090 | char *chost) | |
1853d1ef | 1091 | { |
1092 | Buffer b; | |
661e45a0 | 1093 | char *p; |
1853d1ef | 1094 | u_int len; |
1095 | int fail = 0; | |
1853d1ef | 1096 | |
1097 | buffer_init(&b); | |
1098 | buffer_append(&b, data, datalen); | |
1099 | ||
521d606b | 1100 | p = buffer_get_string(&b, &len); |
1101 | if ((session_id2 == NULL) || | |
1102 | (len != session_id2_len) || | |
1103 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1104 | fail++; |
521d606b | 1105 | xfree(p); |
1106 | ||
1853d1ef | 1107 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1108 | fail++; | |
1109 | p = buffer_get_string(&b, NULL); | |
1110 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1111 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1112 | authctxt->user, p); |
1113 | fail++; | |
1114 | } | |
1115 | xfree(p); | |
1116 | buffer_skip_string(&b); /* service */ | |
1117 | p = buffer_get_string(&b, NULL); | |
1118 | if (strcmp(p, "hostbased") != 0) | |
1119 | fail++; | |
1120 | xfree(p); | |
1121 | buffer_skip_string(&b); /* pkalg */ | |
1122 | buffer_skip_string(&b); /* pkblob */ | |
1123 | ||
1124 | /* verify client host, strip trailing dot if necessary */ | |
1125 | p = buffer_get_string(&b, NULL); | |
1126 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1127 | p[len - 1] = '\0'; | |
1128 | if (strcmp(p, chost) != 0) | |
1129 | fail++; | |
1130 | xfree(p); | |
1131 | ||
1132 | /* verify client user */ | |
1133 | p = buffer_get_string(&b, NULL); | |
1134 | if (strcmp(p, cuser) != 0) | |
1135 | fail++; | |
1136 | xfree(p); | |
1137 | ||
1138 | if (buffer_len(&b) != 0) | |
1139 | fail++; | |
1140 | buffer_free(&b); | |
1141 | return (fail == 0); | |
1142 | } | |
1143 | ||
1144 | int | |
ca75d7de | 1145 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1146 | { |
1147 | Key *key; | |
1148 | u_char *signature, *data, *blob; | |
1149 | u_int signaturelen, datalen, bloblen; | |
1150 | int verified = 0; | |
1151 | int valid_data = 0; | |
1152 | ||
1153 | blob = buffer_get_string(m, &bloblen); | |
1154 | signature = buffer_get_string(m, &signaturelen); | |
1155 | data = buffer_get_string(m, &datalen); | |
1156 | ||
1157 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1158 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1159 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1160 | |
1161 | key = key_from_blob(blob, bloblen); | |
1162 | if (key == NULL) | |
1588c277 | 1163 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1164 | |
1165 | switch (key_blobtype) { | |
1166 | case MM_USERKEY: | |
1167 | valid_data = monitor_valid_userblob(data, datalen); | |
1168 | break; | |
1169 | case MM_HOSTKEY: | |
1170 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1171 | hostbased_cuser, hostbased_chost); | |
1172 | break; | |
1173 | default: | |
1174 | valid_data = 0; | |
1175 | break; | |
1176 | } | |
1177 | if (!valid_data) | |
1588c277 | 1178 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1179 | |
1180 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1181 | debug3("%s: key %p signature %s", | |
1588c277 | 1182 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1183 | |
1184 | key_free(key); | |
1185 | xfree(blob); | |
1186 | xfree(signature); | |
1187 | xfree(data); | |
1188 | ||
d17ef027 | 1189 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1190 | ||
1853d1ef | 1191 | monitor_reset_key_state(); |
1192 | ||
1193 | buffer_clear(m); | |
1194 | buffer_put_int(m, verified); | |
ca75d7de | 1195 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1196 | |
1853d1ef | 1197 | return (verified); |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | mm_record_login(Session *s, struct passwd *pw) | |
1202 | { | |
1203 | socklen_t fromlen; | |
1204 | struct sockaddr_storage from; | |
1205 | ||
1206 | /* | |
1207 | * Get IP address of client. If the connection is not a socket, let | |
1208 | * the address be 0.0.0.0. | |
1209 | */ | |
1210 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1211 | fromlen = sizeof(from); |
1853d1ef | 1212 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1213 | if (getpeername(packet_get_connection_in(), |
1214 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1215 | debug("getpeername: %.100s", strerror(errno)); | |
2362db19 | 1216 | cleanup_exit(255); |
1853d1ef | 1217 | } |
1218 | } | |
1219 | /* Record that there was a login on that tty from the remote host. */ | |
1220 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1221 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1222 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1223 | } |
1224 | ||
1225 | static void | |
1226 | mm_session_close(Session *s) | |
1227 | { | |
b9ed513a | 1228 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1229 | if (s->ttyfd != -1) { |
1588c277 | 1230 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1231 | session_pty_cleanup2(s); |
1232 | } | |
1233 | s->used = 0; | |
1234 | } | |
1235 | ||
1236 | int | |
ca75d7de | 1237 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1238 | { |
b5a28cbc | 1239 | extern struct monitor *pmonitor; |
1853d1ef | 1240 | Session *s; |
1241 | int res, fd0; | |
1242 | ||
1588c277 | 1243 | debug3("%s entering", __func__); |
1853d1ef | 1244 | |
1245 | buffer_clear(m); | |
1246 | s = session_new(); | |
1247 | if (s == NULL) | |
1248 | goto error; | |
1249 | s->authctxt = authctxt; | |
1250 | s->pw = authctxt->pw; | |
b5a28cbc | 1251 | s->pid = pmonitor->m_pid; |
1853d1ef | 1252 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1253 | if (res == 0) | |
1254 | goto error; | |
1853d1ef | 1255 | pty_setowner(authctxt->pw, s->tty); |
1256 | ||
1257 | buffer_put_int(m, 1); | |
1258 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1259 | |
1260 | /* We need to trick ttyslot */ | |
1261 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1262 | fatal("%s: dup2", __func__); |
1853d1ef | 1263 | |
1264 | mm_record_login(s, authctxt->pw); | |
1265 | ||
1266 | /* Now we can close the file descriptor again */ | |
1267 | close(0); | |
1268 | ||
be2ca0c9 | 1269 | /* send messages generated by record_login */ |
1270 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1271 | buffer_clear(&loginmsg); | |
1272 | ||
1273 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1274 | ||
1275 | mm_send_fd(sock, s->ptyfd); | |
1276 | mm_send_fd(sock, s->ttyfd); | |
1277 | ||
1853d1ef | 1278 | /* make sure nothing uses fd 0 */ |
1279 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1280 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1281 | if (fd0 != 0) |
1588c277 | 1282 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1283 | |
1284 | /* slave is not needed */ | |
1285 | close(s->ttyfd); | |
1286 | s->ttyfd = s->ptyfd; | |
1287 | /* no need to dup() because nobody closes ptyfd */ | |
1288 | s->ptymaster = s->ptyfd; | |
1289 | ||
1588c277 | 1290 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1291 | |
1292 | return (0); | |
1293 | ||
1294 | error: | |
1295 | if (s != NULL) | |
1296 | mm_session_close(s); | |
1297 | buffer_put_int(m, 0); | |
ca75d7de | 1298 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1299 | return (0); |
1300 | } | |
1301 | ||
1302 | int | |
ca75d7de | 1303 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1304 | { |
1305 | Session *s; | |
1306 | char *tty; | |
1307 | ||
1588c277 | 1308 | debug3("%s entering", __func__); |
1853d1ef | 1309 | |
1310 | tty = buffer_get_string(m, NULL); | |
1311 | if ((s = session_by_tty(tty)) != NULL) | |
1312 | mm_session_close(s); | |
1313 | buffer_clear(m); | |
1314 | xfree(tty); | |
1315 | return (0); | |
1316 | } | |
1317 | ||
1318 | int | |
ca75d7de | 1319 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1320 | { |
1321 | BIGNUM *p; | |
1322 | int rsafail; | |
1323 | ||
1324 | /* Turn off permissions */ | |
75cccc2c | 1325 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1326 | |
1327 | if ((p = BN_new()) == NULL) | |
1588c277 | 1328 | fatal("%s: BN_new", __func__); |
1853d1ef | 1329 | |
1330 | buffer_get_bignum2(m, p); | |
1331 | ||
1332 | rsafail = ssh1_session_key(p); | |
1333 | ||
1334 | buffer_clear(m); | |
1335 | buffer_put_int(m, rsafail); | |
1336 | buffer_put_bignum2(m, p); | |
1337 | ||
1338 | BN_clear_free(p); | |
1339 | ||
ca75d7de | 1340 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1341 | |
1342 | /* Turn on permissions for sessid passing */ | |
1343 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1344 | ||
1345 | return (0); | |
1346 | } | |
1347 | ||
1348 | int | |
ca75d7de | 1349 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1350 | { |
1351 | int i; | |
1352 | ||
1588c277 | 1353 | debug3("%s entering", __func__); |
1853d1ef | 1354 | |
1355 | if (buffer_len(m) != 16) | |
1588c277 | 1356 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1357 | for (i = 0; i < 16; i++) |
1358 | session_id[i] = buffer_get_char(m); | |
1359 | ||
1360 | /* Turn on permissions for getpwnam */ | |
1361 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1362 | ||
1363 | return (0); | |
1364 | } | |
1365 | ||
1366 | int | |
ca75d7de | 1367 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1368 | { |
1369 | BIGNUM *client_n; | |
1370 | Key *key = NULL; | |
1371 | u_char *blob = NULL; | |
1372 | u_int blen = 0; | |
1373 | int allowed = 0; | |
1374 | ||
1588c277 | 1375 | debug3("%s entering", __func__); |
1853d1ef | 1376 | |
aa586f8e | 1377 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1378 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1379 | fatal("%s: BN_new", __func__); |
1853d1ef | 1380 | buffer_get_bignum2(m, client_n); |
1381 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1382 | BN_clear_free(client_n); | |
1383 | } | |
1384 | buffer_clear(m); | |
1385 | buffer_put_int(m, allowed); | |
92e15201 | 1386 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1387 | |
1388 | /* clear temporarily storage (used by generate challenge) */ | |
1389 | monitor_reset_key_state(); | |
1390 | ||
1391 | if (allowed && key != NULL) { | |
1392 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1393 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1394 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1395 | buffer_put_string(m, blob, blen); |
1396 | ||
1397 | /* Save temporarily for comparison in verify */ | |
1398 | key_blob = blob; | |
1399 | key_bloblen = blen; | |
1400 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1401 | } |
3e2f2431 | 1402 | if (key != NULL) |
1403 | key_free(key); | |
1853d1ef | 1404 | |
1405 | mm_append_debug(m); | |
1406 | ||
ca75d7de | 1407 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1408 | |
1409 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1410 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1411 | return (0); | |
1412 | } | |
1413 | ||
1414 | int | |
ca75d7de | 1415 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1416 | { |
1417 | Key *key = NULL; | |
1418 | u_char *blob; | |
1419 | u_int blen; | |
1420 | ||
1588c277 | 1421 | debug3("%s entering", __func__); |
1853d1ef | 1422 | |
1423 | if (!authctxt->valid) | |
1588c277 | 1424 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1425 | blob = buffer_get_string(m, &blen); |
1426 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1427 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1428 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1429 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1430 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1431 | fatal("%s: received bad key", __func__); |
1853d1ef | 1432 | |
1433 | if (ssh1_challenge) | |
1434 | BN_clear_free(ssh1_challenge); | |
1435 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1436 | ||
1437 | buffer_clear(m); | |
1438 | buffer_put_bignum2(m, ssh1_challenge); | |
1439 | ||
1588c277 | 1440 | debug3("%s sending reply", __func__); |
ca75d7de | 1441 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1442 | |
1443 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1444 | |
1445 | xfree(blob); | |
1446 | key_free(key); | |
1853d1ef | 1447 | return (0); |
1448 | } | |
1449 | ||
1450 | int | |
ca75d7de | 1451 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1452 | { |
1453 | Key *key = NULL; | |
1454 | u_char *blob, *response; | |
1455 | u_int blen, len; | |
1456 | int success; | |
1457 | ||
1588c277 | 1458 | debug3("%s entering", __func__); |
1853d1ef | 1459 | |
1460 | if (!authctxt->valid) | |
1588c277 | 1461 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1462 | if (ssh1_challenge == NULL) |
1588c277 | 1463 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1464 | |
1465 | blob = buffer_get_string(m, &blen); | |
1466 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1467 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1468 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1469 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1470 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1471 | fatal("%s: received bad key", __func__); |
1853d1ef | 1472 | response = buffer_get_string(m, &len); |
1473 | if (len != 16) | |
1588c277 | 1474 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1475 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1476 | ||
3e2f2431 | 1477 | xfree(blob); |
1853d1ef | 1478 | key_free(key); |
1479 | xfree(response); | |
1480 | ||
1481 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1482 | ||
1483 | /* reset state */ | |
1484 | BN_clear_free(ssh1_challenge); | |
1485 | ssh1_challenge = NULL; | |
1486 | monitor_reset_key_state(); | |
1487 | ||
1488 | buffer_clear(m); | |
1489 | buffer_put_int(m, success); | |
ca75d7de | 1490 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1491 | |
1492 | return (success); | |
1493 | } | |
1494 | ||
1495 | int | |
ca75d7de | 1496 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1497 | { |
b5a28cbc | 1498 | extern struct monitor *pmonitor; |
1853d1ef | 1499 | int res, status; |
1500 | ||
1588c277 | 1501 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1502 | |
1503 | /* The child is terminating */ | |
1504 | session_destroy_all(&mm_session_close); | |
1505 | ||
b5a28cbc | 1506 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1507 | if (errno != EINTR) |
1508 | exit(1); | |
1853d1ef | 1509 | |
1510 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1511 | ||
1512 | /* Terminate process */ | |
f6be21a0 | 1513 | exit(res); |
1853d1ef | 1514 | } |
1515 | ||
6039eeef | 1516 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1517 | /* Report that an audit event occurred */ |
1518 | int | |
1519 | mm_answer_audit_event(int socket, Buffer *m) | |
1520 | { | |
1521 | ssh_audit_event_t event; | |
1522 | ||
1523 | debug3("%s entering", __func__); | |
1524 | ||
1525 | event = buffer_get_int(m); | |
c00e4d75 | 1526 | switch(event) { |
6039eeef | 1527 | case SSH_AUTH_FAIL_PUBKEY: |
1528 | case SSH_AUTH_FAIL_HOSTBASED: | |
1529 | case SSH_AUTH_FAIL_GSSAPI: | |
1530 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1531 | case SSH_LOGIN_ROOT_DENIED: | |
1532 | case SSH_CONNECTION_CLOSE: | |
1533 | case SSH_INVALID_USER: | |
c00e4d75 | 1534 | audit_event(event); |
1535 | break; | |
1536 | default: | |
1537 | fatal("Audit event type %d not permitted", event); | |
1538 | } | |
1539 | ||
1540 | return (0); | |
1541 | } | |
1542 | ||
1543 | int | |
1544 | mm_answer_audit_command(int socket, Buffer *m) | |
1545 | { | |
1546 | u_int len; | |
1547 | char *cmd; | |
1548 | ||
1549 | debug3("%s entering", __func__); | |
1550 | cmd = buffer_get_string(m, &len); | |
1551 | /* sanity check command, if so how? */ | |
1552 | audit_run_command(cmd); | |
1553 | xfree(cmd); | |
c00e4d75 | 1554 | return (0); |
1555 | } | |
6039eeef | 1556 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1557 | |
1853d1ef | 1558 | void |
b5a28cbc | 1559 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1560 | { |
1561 | if (compat20) { | |
1562 | set_newkeys(MODE_IN); | |
1563 | set_newkeys(MODE_OUT); | |
1564 | } else { | |
1853d1ef | 1565 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1566 | packet_set_encryption_key(child_state.ssh1key, |
1567 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1568 | xfree(child_state.ssh1key); | |
1853d1ef | 1569 | } |
1570 | ||
9459414c | 1571 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1572 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1573 | xfree(child_state.keyout); | |
1574 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1575 | xfree(child_state.keyin); | |
1576 | ||
1577 | if (!compat20) { | |
1578 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1579 | xfree(child_state.ivout); | |
1580 | packet_set_iv(MODE_IN, child_state.ivin); | |
1581 | xfree(child_state.ivin); | |
1582 | } | |
1583 | ||
1584 | memcpy(&incoming_stream, &child_state.incoming, | |
1585 | sizeof(incoming_stream)); | |
1586 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1587 | sizeof(outgoing_stream)); | |
1588 | ||
1589 | /* Update with new address */ | |
0496cf34 | 1590 | if (options.compression) |
1591 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1592 | |
1593 | /* Network I/O buffers */ | |
1594 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1595 | buffer_clear(&input); | |
1596 | buffer_append(&input, child_state.input, child_state.ilen); | |
1597 | memset(child_state.input, 0, child_state.ilen); | |
1598 | xfree(child_state.input); | |
1599 | ||
1600 | buffer_clear(&output); | |
1601 | buffer_append(&output, child_state.output, child_state.olen); | |
1602 | memset(child_state.output, 0, child_state.olen); | |
1603 | xfree(child_state.output); | |
1604 | } | |
1605 | ||
1606 | static Kex * | |
1607 | mm_get_kex(Buffer *m) | |
1608 | { | |
1609 | Kex *kex; | |
1610 | void *blob; | |
1611 | u_int bloblen; | |
1612 | ||
1613 | kex = xmalloc(sizeof(*kex)); | |
1614 | memset(kex, 0, sizeof(*kex)); | |
1615 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1616 | if ((session_id2 == NULL) || |
1617 | (kex->session_id_len != session_id2_len) || | |
1618 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1619 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1620 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1621 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1622 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1623 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
1853d1ef | 1624 | kex->server = 1; |
1625 | kex->hostkey_type = buffer_get_int(m); | |
1626 | kex->kex_type = buffer_get_int(m); | |
1627 | blob = buffer_get_string(m, &bloblen); | |
1628 | buffer_init(&kex->my); | |
1629 | buffer_append(&kex->my, blob, bloblen); | |
1630 | xfree(blob); | |
1631 | blob = buffer_get_string(m, &bloblen); | |
1632 | buffer_init(&kex->peer); | |
1633 | buffer_append(&kex->peer, blob, bloblen); | |
1634 | xfree(blob); | |
1635 | kex->done = 1; | |
1636 | kex->flags = buffer_get_int(m); | |
1637 | kex->client_version_string = buffer_get_string(m, NULL); | |
1638 | kex->server_version_string = buffer_get_string(m, NULL); | |
1639 | kex->load_host_key=&get_hostkey_by_type; | |
1640 | kex->host_key_index=&get_hostkey_index; | |
1641 | ||
1642 | return (kex); | |
1643 | } | |
1644 | ||
1645 | /* This function requries careful sanity checking */ | |
1646 | ||
1647 | void | |
b5a28cbc | 1648 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1649 | { |
1650 | Buffer m; | |
1651 | u_char *blob, *p; | |
1652 | u_int bloblen, plen; | |
ffd7b36b | 1653 | u_int32_t seqnr, packets; |
1654 | u_int64_t blocks; | |
1853d1ef | 1655 | |
1588c277 | 1656 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1657 | |
1658 | buffer_init(&m); | |
b5a28cbc | 1659 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1660 | if (!compat20) { |
1661 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1662 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1663 | child_state.ssh1key = buffer_get_string(&m, |
1664 | &child_state.ssh1keylen); | |
1853d1ef | 1665 | child_state.ivout = buffer_get_string(&m, |
1666 | &child_state.ivoutlen); | |
1667 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1668 | goto skip; | |
1669 | } else { | |
1670 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1671 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1672 | } |
1673 | ||
1674 | blob = buffer_get_string(&m, &bloblen); | |
1675 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1676 | xfree(blob); | |
1677 | ||
1588c277 | 1678 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1679 | blob = buffer_get_string(&m, &bloblen); |
1680 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1681 | xfree(blob); | |
1682 | ||
1683 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1684 | seqnr = buffer_get_int(&m); |
1685 | blocks = buffer_get_int64(&m); | |
1686 | packets = buffer_get_int(&m); | |
1687 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1688 | seqnr = buffer_get_int(&m); | |
1689 | blocks = buffer_get_int64(&m); | |
1690 | packets = buffer_get_int(&m); | |
1691 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1692 | |
1693 | skip: | |
1694 | /* Get the key context */ | |
1695 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1696 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1697 | ||
1588c277 | 1698 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1699 | /* Get compression state */ |
1700 | p = buffer_get_string(&m, &plen); | |
1701 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1702 | fatal("%s: bad request size", __func__); |
1853d1ef | 1703 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1704 | xfree(p); | |
1705 | ||
1706 | p = buffer_get_string(&m, &plen); | |
1707 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1708 | fatal("%s: bad request size", __func__); |
1853d1ef | 1709 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1710 | xfree(p); | |
1711 | ||
1712 | /* Network I/O buffers */ | |
1588c277 | 1713 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1714 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1715 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1716 | ||
1717 | buffer_free(&m); | |
1718 | } | |
1719 | ||
1720 | ||
1721 | /* Allocation functions for zlib */ | |
1722 | void * | |
1723 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1724 | { | |
39e71188 | 1725 | size_t len = (size_t) size * ncount; |
1853d1ef | 1726 | void *address; |
1727 | ||
b85698ab | 1728 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1729 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1730 | ||
1731 | address = mm_malloc(mm, len); | |
1853d1ef | 1732 | |
1733 | return (address); | |
1734 | } | |
1735 | ||
1736 | void | |
1737 | mm_zfree(struct mm_master *mm, void *address) | |
1738 | { | |
1739 | mm_free(mm, address); | |
1740 | } | |
1741 | ||
1742 | void | |
1743 | mm_init_compression(struct mm_master *mm) | |
1744 | { | |
1745 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1746 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1747 | outgoing_stream.opaque = mm; | |
1748 | ||
1749 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1750 | incoming_stream.zfree = (free_func)mm_zfree; | |
1751 | incoming_stream.opaque = mm; | |
1752 | } | |
1753 | ||
1754 | /* XXX */ | |
1755 | ||
1756 | #define FD_CLOSEONEXEC(x) do { \ | |
1757 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1758 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1759 | } while (0) | |
1760 | ||
1761 | static void | |
1762 | monitor_socketpair(int *pair) | |
1763 | { | |
f1af2dbf | 1764 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1765 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1766 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1767 | #else |
1768 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1769 | __func__); |
f1af2dbf | 1770 | #endif |
1853d1ef | 1771 | FD_CLOSEONEXEC(pair[0]); |
1772 | FD_CLOSEONEXEC(pair[1]); | |
1773 | } | |
1774 | ||
1775 | #define MM_MEMSIZE 65536 | |
1776 | ||
1777 | struct monitor * | |
1778 | monitor_init(void) | |
1779 | { | |
1780 | struct monitor *mon; | |
1781 | int pair[2]; | |
1782 | ||
1783 | mon = xmalloc(sizeof(*mon)); | |
1784 | ||
a9b33b95 | 1785 | mon->m_pid = 0; |
1853d1ef | 1786 | monitor_socketpair(pair); |
1787 | ||
1788 | mon->m_recvfd = pair[0]; | |
1789 | mon->m_sendfd = pair[1]; | |
1790 | ||
1791 | /* Used to share zlib space across processes */ | |
0496cf34 | 1792 | if (options.compression) { |
1793 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1794 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1795 | |
0496cf34 | 1796 | /* Compression needs to share state across borders */ |
1797 | mm_init_compression(mon->m_zlib); | |
1798 | } | |
1853d1ef | 1799 | |
1800 | return mon; | |
1801 | } | |
1802 | ||
1803 | void | |
1804 | monitor_reinit(struct monitor *mon) | |
1805 | { | |
1806 | int pair[2]; | |
1807 | ||
1808 | monitor_socketpair(pair); | |
1809 | ||
1810 | mon->m_recvfd = pair[0]; | |
1811 | mon->m_sendfd = pair[1]; | |
1812 | } | |
7364bd04 | 1813 | |
1814 | #ifdef GSSAPI | |
1815 | int | |
ca75d7de | 1816 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1817 | { |
ca75d7de | 1818 | gss_OID_desc goid; |
7364bd04 | 1819 | OM_uint32 major; |
1820 | u_int len; | |
1821 | ||
ca75d7de | 1822 | goid.elements = buffer_get_string(m, &len); |
1823 | goid.length = len; | |
7364bd04 | 1824 | |
ca75d7de | 1825 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1826 | |
ca75d7de | 1827 | xfree(goid.elements); |
7364bd04 | 1828 | |
1829 | buffer_clear(m); | |
1830 | buffer_put_int(m, major); | |
1831 | ||
8442cc66 | 1832 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1833 | |
1834 | /* Now we have a context, enable the step */ | |
1835 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1836 | ||
1837 | return (0); | |
1838 | } | |
1839 | ||
1840 | int | |
ca75d7de | 1841 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1842 | { |
1843 | gss_buffer_desc in; | |
1844 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1845 | OM_uint32 major, minor; |
7364bd04 | 1846 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1847 | u_int len; |
7364bd04 | 1848 | |
f99e1ca4 | 1849 | in.value = buffer_get_string(m, &len); |
1850 | in.length = len; | |
7364bd04 | 1851 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1852 | xfree(in.value); | |
1853 | ||
1854 | buffer_clear(m); | |
1855 | buffer_put_int(m, major); | |
1856 | buffer_put_string(m, out.value, out.length); | |
1857 | buffer_put_int(m, flags); | |
ca75d7de | 1858 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1859 | |
1860 | gss_release_buffer(&minor, &out); | |
1861 | ||
8442cc66 | 1862 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1863 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1864 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1865 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1866 | } |
1867 | return (0); | |
1868 | } | |
1869 | ||
0789992b | 1870 | int |
ca75d7de | 1871 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1872 | { |
1873 | gss_buffer_desc gssbuf, mic; | |
1874 | OM_uint32 ret; | |
1875 | u_int len; | |
b6453d99 | 1876 | |
0789992b | 1877 | gssbuf.value = buffer_get_string(m, &len); |
1878 | gssbuf.length = len; | |
1879 | mic.value = buffer_get_string(m, &len); | |
1880 | mic.length = len; | |
b6453d99 | 1881 | |
0789992b | 1882 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1883 | |
0789992b | 1884 | xfree(gssbuf.value); |
1885 | xfree(mic.value); | |
b6453d99 | 1886 | |
0789992b | 1887 | buffer_clear(m); |
1888 | buffer_put_int(m, ret); | |
b6453d99 | 1889 | |
ca75d7de | 1890 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1891 | |
0789992b | 1892 | if (!GSS_ERROR(ret)) |
1893 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1894 | |
0789992b | 1895 | return (0); |
1896 | } | |
1897 | ||
7364bd04 | 1898 | int |
ca75d7de | 1899 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1900 | { |
1901 | int authenticated; | |
1902 | ||
1903 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1904 | ||
1905 | buffer_clear(m); | |
1906 | buffer_put_int(m, authenticated); | |
1907 | ||
1908 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1909 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1910 | |
8442cc66 | 1911 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1912 | |
1913 | /* Monitor loop will terminate if authenticated */ | |
1914 | return (authenticated); | |
1915 | } | |
1916 | #endif /* GSSAPI */ |