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1 | /* $OpenBSD: monitor.c,v 1.104 2009/06/12 20:43:22 andreas Exp $ */ | |
2 | /* | |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
29 | ||
30 | #include <sys/types.h> | |
31 | #include <sys/param.h> | |
32 | #include <sys/socket.h> | |
33 | #include "openbsd-compat/sys-tree.h" | |
34 | #include <sys/wait.h> | |
35 | ||
36 | #include <errno.h> | |
37 | #include <fcntl.h> | |
38 | #ifdef HAVE_PATHS_H | |
39 | #include <paths.h> | |
40 | #endif | |
41 | #include <pwd.h> | |
42 | #include <signal.h> | |
43 | #include <stdarg.h> | |
44 | #include <stdlib.h> | |
45 | #include <string.h> | |
46 | #include <unistd.h> | |
47 | ||
48 | #ifdef SKEY | |
49 | #include <skey.h> | |
50 | #endif | |
51 | ||
52 | #include <openssl/dh.h> | |
53 | ||
54 | #include "openbsd-compat/sys-queue.h" | |
55 | #include "xmalloc.h" | |
56 | #include "ssh.h" | |
57 | #include "key.h" | |
58 | #include "buffer.h" | |
59 | #include "hostfile.h" | |
60 | #include "auth.h" | |
61 | #include "cipher.h" | |
62 | #include "kex.h" | |
63 | #include "dh.h" | |
64 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ | |
65 | #undef TARGET_OS_MAC | |
66 | #include "zlib.h" | |
67 | #define TARGET_OS_MAC 1 | |
68 | #else | |
69 | #include "zlib.h" | |
70 | #endif | |
71 | #include "packet.h" | |
72 | #include "auth-options.h" | |
73 | #include "sshpty.h" | |
74 | #include "channels.h" | |
75 | #include "session.h" | |
76 | #include "sshlogin.h" | |
77 | #include "canohost.h" | |
78 | #include "log.h" | |
79 | #include "servconf.h" | |
80 | #include "monitor.h" | |
81 | #include "monitor_mm.h" | |
82 | #ifdef GSSAPI | |
83 | #include "ssh-gss.h" | |
84 | #endif | |
85 | #include "monitor_wrap.h" | |
86 | #include "monitor_fdpass.h" | |
87 | #include "misc.h" | |
88 | #include "compat.h" | |
89 | #include "ssh2.h" | |
90 | #include "jpake.h" | |
91 | #include "roaming.h" | |
92 | ||
93 | #ifdef GSSAPI | |
94 | static Gssctxt *gsscontext = NULL; | |
95 | #endif | |
96 | ||
97 | /* Imports */ | |
98 | extern ServerOptions options; | |
99 | extern u_int utmp_len; | |
100 | extern Newkeys *current_keys[]; | |
101 | extern z_stream incoming_stream; | |
102 | extern z_stream outgoing_stream; | |
103 | extern u_char session_id[]; | |
104 | extern Buffer auth_debug; | |
105 | extern int auth_debug_init; | |
106 | extern Buffer loginmsg; | |
107 | ||
108 | /* State exported from the child */ | |
109 | ||
110 | struct { | |
111 | z_stream incoming; | |
112 | z_stream outgoing; | |
113 | u_char *keyin; | |
114 | u_int keyinlen; | |
115 | u_char *keyout; | |
116 | u_int keyoutlen; | |
117 | u_char *ivin; | |
118 | u_int ivinlen; | |
119 | u_char *ivout; | |
120 | u_int ivoutlen; | |
121 | u_char *ssh1key; | |
122 | u_int ssh1keylen; | |
123 | int ssh1cipher; | |
124 | int ssh1protoflags; | |
125 | u_char *input; | |
126 | u_int ilen; | |
127 | u_char *output; | |
128 | u_int olen; | |
129 | u_int64_t sent_bytes; | |
130 | u_int64_t recv_bytes; | |
131 | } child_state; | |
132 | ||
133 | /* Functions on the monitor that answer unprivileged requests */ | |
134 | ||
135 | int mm_answer_moduli(int, Buffer *); | |
136 | int mm_answer_sign(int, Buffer *); | |
137 | int mm_answer_pwnamallow(int, Buffer *); | |
138 | int mm_answer_auth2_read_banner(int, Buffer *); | |
139 | int mm_answer_authserv(int, Buffer *); | |
140 | int mm_answer_authpassword(int, Buffer *); | |
141 | int mm_answer_bsdauthquery(int, Buffer *); | |
142 | int mm_answer_bsdauthrespond(int, Buffer *); | |
143 | int mm_answer_skeyquery(int, Buffer *); | |
144 | int mm_answer_skeyrespond(int, Buffer *); | |
145 | int mm_answer_keyallowed(int, Buffer *); | |
146 | int mm_answer_keyverify(int, Buffer *); | |
147 | int mm_answer_pty(int, Buffer *); | |
148 | int mm_answer_pty_cleanup(int, Buffer *); | |
149 | int mm_answer_term(int, Buffer *); | |
150 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
151 | int mm_answer_rsa_challenge(int, Buffer *); | |
152 | int mm_answer_rsa_response(int, Buffer *); | |
153 | int mm_answer_sesskey(int, Buffer *); | |
154 | int mm_answer_sessid(int, Buffer *); | |
155 | int mm_answer_jpake_get_pwdata(int, Buffer *); | |
156 | int mm_answer_jpake_step1(int, Buffer *); | |
157 | int mm_answer_jpake_step2(int, Buffer *); | |
158 | int mm_answer_jpake_key_confirm(int, Buffer *); | |
159 | int mm_answer_jpake_check_confirm(int, Buffer *); | |
160 | ||
161 | #ifdef USE_PAM | |
162 | int mm_answer_pam_start(int, Buffer *); | |
163 | int mm_answer_pam_account(int, Buffer *); | |
164 | int mm_answer_pam_init_ctx(int, Buffer *); | |
165 | int mm_answer_pam_query(int, Buffer *); | |
166 | int mm_answer_pam_respond(int, Buffer *); | |
167 | int mm_answer_pam_free_ctx(int, Buffer *); | |
168 | #endif | |
169 | ||
170 | #ifdef GSSAPI | |
171 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
172 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
173 | int mm_answer_gss_userok(int, Buffer *); | |
174 | int mm_answer_gss_checkmic(int, Buffer *); | |
175 | int mm_answer_gss_sign(int, Buffer *); | |
176 | int mm_answer_gss_error(int, Buffer *); | |
177 | int mm_answer_gss_indicate_mechs(int, Buffer *); | |
178 | int mm_answer_gss_localname(int, Buffer *); | |
179 | int mm_answer_gss_updatecreds(int, Buffer *); | |
180 | #endif | |
181 | ||
182 | #ifdef SSH_AUDIT_EVENTS | |
183 | int mm_answer_audit_event(int, Buffer *); | |
184 | int mm_answer_audit_command(int, Buffer *); | |
185 | #endif | |
186 | ||
187 | static Authctxt *authctxt; | |
188 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
189 | ||
190 | /* local state for key verify */ | |
191 | static u_char *key_blob = NULL; | |
192 | static u_int key_bloblen = 0; | |
193 | static int key_blobtype = MM_NOKEY; | |
194 | static char *hostbased_cuser = NULL; | |
195 | static char *hostbased_chost = NULL; | |
196 | static char *auth_method = "unknown"; | |
197 | static u_int session_id2_len = 0; | |
198 | static u_char *session_id2 = NULL; | |
199 | static pid_t monitor_child_pid; | |
200 | ||
201 | struct mon_table { | |
202 | enum monitor_reqtype type; | |
203 | int flags; | |
204 | int (*f)(int, Buffer *); | |
205 | }; | |
206 | ||
207 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
208 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
209 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
210 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ | |
211 | ||
212 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
213 | ||
214 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
215 | ||
216 | struct mon_table mon_dispatch_proto20[] = { | |
217 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
218 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
219 | {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow}, | |
220 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
221 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, | |
222 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
223 | #ifdef USE_PAM | |
224 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, | |
225 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, | |
226 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
227 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
228 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
229 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
230 | #endif | |
231 | #ifdef SSH_AUDIT_EVENTS | |
232 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
233 | #endif | |
234 | #ifdef BSD_AUTH | |
235 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
236 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, | |
237 | #endif | |
238 | #ifdef SKEY | |
239 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
240 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
241 | #endif | |
242 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
243 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
244 | #ifdef GSSAPI | |
245 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
246 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
247 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
248 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, | |
249 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, | |
250 | {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error}, | |
251 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, | |
252 | {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname}, | |
253 | #endif | |
254 | #ifdef JPAKE | |
255 | {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, | |
256 | {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, | |
257 | {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, | |
258 | {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, | |
259 | {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, | |
260 | #endif | |
261 | {0, 0, NULL} | |
262 | }; | |
263 | ||
264 | struct mon_table mon_dispatch_postauth20[] = { | |
265 | #ifdef GSSAPI | |
266 | {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, | |
267 | {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, | |
268 | {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, | |
269 | {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error}, | |
270 | {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs}, | |
271 | {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds}, | |
272 | #endif | |
273 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
274 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
275 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
276 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
277 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
278 | #ifdef SSH_AUDIT_EVENTS | |
279 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
280 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
281 | #endif | |
282 | {0, 0, NULL} | |
283 | }; | |
284 | ||
285 | struct mon_table mon_dispatch_proto15[] = { | |
286 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
287 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
288 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
289 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
290 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, | |
291 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
292 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
293 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
294 | #ifdef BSD_AUTH | |
295 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
296 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, | |
297 | #endif | |
298 | #ifdef SKEY | |
299 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
300 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
301 | #endif | |
302 | #ifdef GSSAPI | |
303 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
304 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
305 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, | |
306 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
307 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, | |
308 | #endif | |
309 | #ifdef USE_PAM | |
310 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, | |
311 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, | |
312 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
313 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
314 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
315 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
316 | #endif | |
317 | #ifdef SSH_AUDIT_EVENTS | |
318 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
319 | #endif | |
320 | {0, 0, NULL} | |
321 | }; | |
322 | ||
323 | struct mon_table mon_dispatch_postauth15[] = { | |
324 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
325 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
326 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
327 | #ifdef SSH_AUDIT_EVENTS | |
328 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
329 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, | |
330 | #endif | |
331 | {0, 0, NULL} | |
332 | }; | |
333 | ||
334 | struct mon_table *mon_dispatch; | |
335 | ||
336 | /* Specifies if a certain message is allowed at the moment */ | |
337 | ||
338 | static void | |
339 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
340 | { | |
341 | while (ent->f != NULL) { | |
342 | if (ent->type == type) { | |
343 | ent->flags &= ~MON_PERMIT; | |
344 | ent->flags |= permit ? MON_PERMIT : 0; | |
345 | return; | |
346 | } | |
347 | ent++; | |
348 | } | |
349 | } | |
350 | ||
351 | static void | |
352 | monitor_permit_authentications(int permit) | |
353 | { | |
354 | struct mon_table *ent = mon_dispatch; | |
355 | ||
356 | while (ent->f != NULL) { | |
357 | if (ent->flags & MON_AUTH) { | |
358 | ent->flags &= ~MON_PERMIT; | |
359 | ent->flags |= permit ? MON_PERMIT : 0; | |
360 | } | |
361 | ent++; | |
362 | } | |
363 | } | |
364 | ||
365 | void | |
366 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
367 | { | |
368 | struct mon_table *ent; | |
369 | int authenticated = 0; | |
370 | ||
371 | debug3("preauth child monitor started"); | |
372 | ||
373 | authctxt = _authctxt; | |
374 | memset(authctxt, 0, sizeof(*authctxt)); | |
375 | ||
376 | authctxt->loginmsg = &loginmsg; | |
377 | ||
378 | if (compat20) { | |
379 | mon_dispatch = mon_dispatch_proto20; | |
380 | ||
381 | /* Permit requests for moduli and signatures */ | |
382 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
383 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
384 | #ifdef GSSAPI | |
385 | /* and for the GSSAPI key exchange */ | |
386 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
387 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); | |
388 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1); | |
389 | #endif | |
390 | } else { | |
391 | mon_dispatch = mon_dispatch_proto15; | |
392 | ||
393 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
394 | } | |
395 | ||
396 | /* The first few requests do not require asynchronous access */ | |
397 | while (!authenticated) { | |
398 | auth_method = "unknown"; | |
399 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); | |
400 | if (authenticated) { | |
401 | if (!(ent->flags & MON_AUTHDECIDE)) | |
402 | fatal("%s: unexpected authentication from %d", | |
403 | __func__, ent->type); | |
404 | if (authctxt->pw->pw_uid == 0 && | |
405 | !auth_root_allowed(auth_method)) | |
406 | authenticated = 0; | |
407 | #ifdef USE_PAM | |
408 | /* PAM needs to perform account checks after auth */ | |
409 | if (options.use_pam && authenticated) { | |
410 | Buffer m; | |
411 | ||
412 | buffer_init(&m); | |
413 | mm_request_receive_expect(pmonitor->m_sendfd, | |
414 | MONITOR_REQ_PAM_ACCOUNT, &m); | |
415 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
416 | buffer_free(&m); | |
417 | } | |
418 | #endif | |
419 | } | |
420 | ||
421 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { | |
422 | auth_log(authctxt, authenticated, auth_method, | |
423 | compat20 ? " ssh2" : ""); | |
424 | if (!authenticated) | |
425 | authctxt->failures++; | |
426 | } | |
427 | #ifdef JPAKE | |
428 | /* Cleanup JPAKE context after authentication */ | |
429 | if (ent->flags & MON_AUTHDECIDE) { | |
430 | if (authctxt->jpake_ctx != NULL) { | |
431 | jpake_free(authctxt->jpake_ctx); | |
432 | authctxt->jpake_ctx = NULL; | |
433 | } | |
434 | } | |
435 | #endif | |
436 | } | |
437 | ||
438 | if (!authctxt->valid) | |
439 | fatal("%s: authenticated invalid user", __func__); | |
440 | if (strcmp(auth_method, "unknown") == 0) | |
441 | fatal("%s: authentication method name unknown", __func__); | |
442 | ||
443 | debug("%s: %s has been authenticated by privileged process", | |
444 | __func__, authctxt->user); | |
445 | ||
446 | mm_get_keystate(pmonitor); | |
447 | } | |
448 | ||
449 | static void | |
450 | monitor_set_child_handler(pid_t pid) | |
451 | { | |
452 | monitor_child_pid = pid; | |
453 | } | |
454 | ||
455 | static void | |
456 | monitor_child_handler(int sig) | |
457 | { | |
458 | kill(monitor_child_pid, sig); | |
459 | } | |
460 | ||
461 | void | |
462 | monitor_child_postauth(struct monitor *pmonitor) | |
463 | { | |
464 | monitor_set_child_handler(pmonitor->m_pid); | |
465 | signal(SIGHUP, &monitor_child_handler); | |
466 | signal(SIGTERM, &monitor_child_handler); | |
467 | signal(SIGINT, &monitor_child_handler); | |
468 | ||
469 | if (compat20) { | |
470 | mon_dispatch = mon_dispatch_postauth20; | |
471 | ||
472 | /* Permit requests for moduli and signatures */ | |
473 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
474 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
475 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
476 | ||
477 | #ifdef GSSAPI | |
478 | /* and for the GSSAPI key exchange */ | |
479 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1); | |
480 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1); | |
481 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1); | |
482 | #endif | |
483 | ||
484 | } else { | |
485 | mon_dispatch = mon_dispatch_postauth15; | |
486 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
487 | } | |
488 | #ifdef GSSAPI | |
489 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); | |
490 | #endif | |
491 | if (!no_pty_flag) { | |
492 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
493 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
494 | } | |
495 | ||
496 | for (;;) | |
497 | monitor_read(pmonitor, mon_dispatch, NULL); | |
498 | } | |
499 | ||
500 | void | |
501 | monitor_sync(struct monitor *pmonitor) | |
502 | { | |
503 | if (options.compression) { | |
504 | /* The member allocation is not visible, so sync it */ | |
505 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
506 | } | |
507 | } | |
508 | ||
509 | int | |
510 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, | |
511 | struct mon_table **pent) | |
512 | { | |
513 | Buffer m; | |
514 | int ret; | |
515 | u_char type; | |
516 | ||
517 | buffer_init(&m); | |
518 | ||
519 | mm_request_receive(pmonitor->m_sendfd, &m); | |
520 | type = buffer_get_char(&m); | |
521 | ||
522 | debug3("%s: checking request %d", __func__, type); | |
523 | ||
524 | while (ent->f != NULL) { | |
525 | if (ent->type == type) | |
526 | break; | |
527 | ent++; | |
528 | } | |
529 | ||
530 | if (ent->f != NULL) { | |
531 | if (!(ent->flags & MON_PERMIT)) | |
532 | fatal("%s: unpermitted request %d", __func__, | |
533 | type); | |
534 | ret = (*ent->f)(pmonitor->m_sendfd, &m); | |
535 | buffer_free(&m); | |
536 | ||
537 | /* The child may use this request only once, disable it */ | |
538 | if (ent->flags & MON_ONCE) { | |
539 | debug2("%s: %d used once, disabling now", __func__, | |
540 | type); | |
541 | ent->flags &= ~MON_PERMIT; | |
542 | } | |
543 | ||
544 | if (pent != NULL) | |
545 | *pent = ent; | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | fatal("%s: unsupported request: %d", __func__, type); | |
551 | ||
552 | /* NOTREACHED */ | |
553 | return (-1); | |
554 | } | |
555 | ||
556 | /* allowed key state */ | |
557 | static int | |
558 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
559 | { | |
560 | /* make sure key is allowed */ | |
561 | if (key_blob == NULL || key_bloblen != bloblen || | |
562 | memcmp(key_blob, blob, key_bloblen)) | |
563 | return (0); | |
564 | return (1); | |
565 | } | |
566 | ||
567 | static void | |
568 | monitor_reset_key_state(void) | |
569 | { | |
570 | /* reset state */ | |
571 | if (key_blob != NULL) | |
572 | xfree(key_blob); | |
573 | if (hostbased_cuser != NULL) | |
574 | xfree(hostbased_cuser); | |
575 | if (hostbased_chost != NULL) | |
576 | xfree(hostbased_chost); | |
577 | key_blob = NULL; | |
578 | key_bloblen = 0; | |
579 | key_blobtype = MM_NOKEY; | |
580 | hostbased_cuser = NULL; | |
581 | hostbased_chost = NULL; | |
582 | } | |
583 | ||
584 | int | |
585 | mm_answer_moduli(int sock, Buffer *m) | |
586 | { | |
587 | DH *dh; | |
588 | int min, want, max; | |
589 | ||
590 | min = buffer_get_int(m); | |
591 | want = buffer_get_int(m); | |
592 | max = buffer_get_int(m); | |
593 | ||
594 | debug3("%s: got parameters: %d %d %d", | |
595 | __func__, min, want, max); | |
596 | /* We need to check here, too, in case the child got corrupted */ | |
597 | if (max < min || want < min || max < want) | |
598 | fatal("%s: bad parameters: %d %d %d", | |
599 | __func__, min, want, max); | |
600 | ||
601 | buffer_clear(m); | |
602 | ||
603 | dh = choose_dh(min, want, max); | |
604 | if (dh == NULL) { | |
605 | buffer_put_char(m, 0); | |
606 | return (0); | |
607 | } else { | |
608 | /* Send first bignum */ | |
609 | buffer_put_char(m, 1); | |
610 | buffer_put_bignum2(m, dh->p); | |
611 | buffer_put_bignum2(m, dh->g); | |
612 | ||
613 | DH_free(dh); | |
614 | } | |
615 | mm_request_send(sock, MONITOR_ANS_MODULI, m); | |
616 | return (0); | |
617 | } | |
618 | ||
619 | int | |
620 | mm_answer_sign(int sock, Buffer *m) | |
621 | { | |
622 | Key *key; | |
623 | u_char *p; | |
624 | u_char *signature; | |
625 | u_int siglen, datlen; | |
626 | int keyid; | |
627 | ||
628 | debug3("%s", __func__); | |
629 | ||
630 | keyid = buffer_get_int(m); | |
631 | p = buffer_get_string(m, &datlen); | |
632 | ||
633 | /* | |
634 | * Supported KEX types will only return SHA1 (20 byte) or | |
635 | * SHA256 (32 byte) hashes | |
636 | */ | |
637 | if (datlen != 20 && datlen != 32) | |
638 | fatal("%s: data length incorrect: %u", __func__, datlen); | |
639 | ||
640 | /* save session id, it will be passed on the first call */ | |
641 | if (session_id2_len == 0) { | |
642 | session_id2_len = datlen; | |
643 | session_id2 = xmalloc(session_id2_len); | |
644 | memcpy(session_id2, p, session_id2_len); | |
645 | } | |
646 | ||
647 | if ((key = get_hostkey_by_index(keyid)) == NULL) | |
648 | fatal("%s: no hostkey from index %d", __func__, keyid); | |
649 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) | |
650 | fatal("%s: key_sign failed", __func__); | |
651 | ||
652 | debug3("%s: signature %p(%u)", __func__, signature, siglen); | |
653 | ||
654 | buffer_clear(m); | |
655 | buffer_put_string(m, signature, siglen); | |
656 | ||
657 | xfree(p); | |
658 | xfree(signature); | |
659 | ||
660 | mm_request_send(sock, MONITOR_ANS_SIGN, m); | |
661 | ||
662 | /* Turn on permissions for getpwnam */ | |
663 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
664 | ||
665 | return (0); | |
666 | } | |
667 | ||
668 | /* Retrieves the password entry and also checks if the user is permitted */ | |
669 | ||
670 | int | |
671 | mm_answer_pwnamallow(int sock, Buffer *m) | |
672 | { | |
673 | char *username; | |
674 | struct passwd *pwent; | |
675 | int allowed = 0; | |
676 | ||
677 | debug3("%s", __func__); | |
678 | ||
679 | username = buffer_get_string(m, NULL); | |
680 | ||
681 | pwent = getpwnamallow(username); | |
682 | ||
683 | if (authctxt->user) xfree(authctxt->user); | |
684 | authctxt->user = xstrdup(username); | |
685 | #ifdef USE_PAM | |
686 | if (options.permit_pam_user_change) | |
687 | setproctitle("%s [priv]", pwent ? "[pam]" : "unknown"); | |
688 | else | |
689 | #endif | |
690 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
691 | xfree(username); | |
692 | ||
693 | buffer_clear(m); | |
694 | ||
695 | if (pwent == NULL) { | |
696 | buffer_put_char(m, 0); | |
697 | authctxt->pw = fakepw(); | |
698 | goto out; | |
699 | } | |
700 | ||
701 | allowed = 1; | |
702 | authctxt->pw = pwent; | |
703 | authctxt->valid = 1; | |
704 | ||
705 | buffer_put_char(m, 1); | |
706 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
707 | buffer_put_cstring(m, pwent->pw_name); | |
708 | buffer_put_cstring(m, "*"); | |
709 | buffer_put_cstring(m, pwent->pw_gecos); | |
710 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
711 | buffer_put_cstring(m, pwent->pw_class); | |
712 | #endif | |
713 | buffer_put_cstring(m, pwent->pw_dir); | |
714 | buffer_put_cstring(m, pwent->pw_shell); | |
715 | ||
716 | out: | |
717 | buffer_put_string(m, &options, sizeof(options)); | |
718 | if (options.banner != NULL) | |
719 | buffer_put_cstring(m, options.banner); | |
720 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); | |
721 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); | |
722 | ||
723 | /* For SSHv1 allow authentication now */ | |
724 | if (!compat20) | |
725 | monitor_permit_authentications(1); | |
726 | else { | |
727 | /* Allow service/style information on the auth context */ | |
728 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
729 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); | |
730 | } | |
731 | ||
732 | #ifdef USE_PAM | |
733 | if (options.use_pam) | |
734 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
735 | #endif | |
736 | ||
737 | return (0); | |
738 | } | |
739 | ||
740 | int mm_answer_auth2_read_banner(int sock, Buffer *m) | |
741 | { | |
742 | char *banner; | |
743 | ||
744 | buffer_clear(m); | |
745 | banner = auth2_read_banner(); | |
746 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
747 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); | |
748 | ||
749 | if (banner != NULL) | |
750 | xfree(banner); | |
751 | ||
752 | return (0); | |
753 | } | |
754 | ||
755 | int | |
756 | mm_answer_authserv(int sock, Buffer *m) | |
757 | { | |
758 | monitor_permit_authentications(1); | |
759 | ||
760 | authctxt->service = buffer_get_string(m, NULL); | |
761 | authctxt->style = buffer_get_string(m, NULL); | |
762 | debug3("%s: service=%s, style=%s", | |
763 | __func__, authctxt->service, authctxt->style); | |
764 | ||
765 | if (strlen(authctxt->style) == 0) { | |
766 | xfree(authctxt->style); | |
767 | authctxt->style = NULL; | |
768 | } | |
769 | ||
770 | return (0); | |
771 | } | |
772 | ||
773 | int | |
774 | mm_answer_authpassword(int sock, Buffer *m) | |
775 | { | |
776 | static int call_count; | |
777 | char *passwd; | |
778 | int authenticated; | |
779 | u_int plen; | |
780 | ||
781 | passwd = buffer_get_string(m, &plen); | |
782 | /* Only authenticate if the context is valid */ | |
783 | authenticated = options.password_authentication && | |
784 | auth_password(authctxt, passwd); | |
785 | memset(passwd, 0, strlen(passwd)); | |
786 | xfree(passwd); | |
787 | ||
788 | buffer_clear(m); | |
789 | buffer_put_int(m, authenticated); | |
790 | ||
791 | debug3("%s: sending result %d", __func__, authenticated); | |
792 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); | |
793 | ||
794 | call_count++; | |
795 | if (plen == 0 && call_count == 1) | |
796 | auth_method = "none"; | |
797 | else | |
798 | auth_method = "password"; | |
799 | ||
800 | /* Causes monitor loop to terminate if authenticated */ | |
801 | return (authenticated); | |
802 | } | |
803 | ||
804 | #ifdef BSD_AUTH | |
805 | int | |
806 | mm_answer_bsdauthquery(int sock, Buffer *m) | |
807 | { | |
808 | char *name, *infotxt; | |
809 | u_int numprompts; | |
810 | u_int *echo_on; | |
811 | char **prompts; | |
812 | u_int success; | |
813 | ||
814 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, | |
815 | &prompts, &echo_on) < 0 ? 0 : 1; | |
816 | ||
817 | buffer_clear(m); | |
818 | buffer_put_int(m, success); | |
819 | if (success) | |
820 | buffer_put_cstring(m, prompts[0]); | |
821 | ||
822 | debug3("%s: sending challenge success: %u", __func__, success); | |
823 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); | |
824 | ||
825 | if (success) { | |
826 | xfree(name); | |
827 | xfree(infotxt); | |
828 | xfree(prompts); | |
829 | xfree(echo_on); | |
830 | } | |
831 | ||
832 | return (0); | |
833 | } | |
834 | ||
835 | int | |
836 | mm_answer_bsdauthrespond(int sock, Buffer *m) | |
837 | { | |
838 | char *response; | |
839 | int authok; | |
840 | ||
841 | if (authctxt->as == 0) | |
842 | fatal("%s: no bsd auth session", __func__); | |
843 | ||
844 | response = buffer_get_string(m, NULL); | |
845 | authok = options.challenge_response_authentication && | |
846 | auth_userresponse(authctxt->as, response, 0); | |
847 | authctxt->as = NULL; | |
848 | debug3("%s: <%s> = <%d>", __func__, response, authok); | |
849 | xfree(response); | |
850 | ||
851 | buffer_clear(m); | |
852 | buffer_put_int(m, authok); | |
853 | ||
854 | debug3("%s: sending authenticated: %d", __func__, authok); | |
855 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); | |
856 | ||
857 | auth_method = "bsdauth"; | |
858 | ||
859 | return (authok != 0); | |
860 | } | |
861 | #endif | |
862 | ||
863 | #ifdef SKEY | |
864 | int | |
865 | mm_answer_skeyquery(int sock, Buffer *m) | |
866 | { | |
867 | struct skey skey; | |
868 | char challenge[1024]; | |
869 | u_int success; | |
870 | ||
871 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, | |
872 | sizeof(challenge)) < 0 ? 0 : 1; | |
873 | ||
874 | buffer_clear(m); | |
875 | buffer_put_int(m, success); | |
876 | if (success) | |
877 | buffer_put_cstring(m, challenge); | |
878 | ||
879 | debug3("%s: sending challenge success: %u", __func__, success); | |
880 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); | |
881 | ||
882 | return (0); | |
883 | } | |
884 | ||
885 | int | |
886 | mm_answer_skeyrespond(int sock, Buffer *m) | |
887 | { | |
888 | char *response; | |
889 | int authok; | |
890 | ||
891 | response = buffer_get_string(m, NULL); | |
892 | ||
893 | authok = (options.challenge_response_authentication && | |
894 | authctxt->valid && | |
895 | skey_haskey(authctxt->pw->pw_name) == 0 && | |
896 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
897 | ||
898 | xfree(response); | |
899 | ||
900 | buffer_clear(m); | |
901 | buffer_put_int(m, authok); | |
902 | ||
903 | debug3("%s: sending authenticated: %d", __func__, authok); | |
904 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); | |
905 | ||
906 | auth_method = "skey"; | |
907 | ||
908 | return (authok != 0); | |
909 | } | |
910 | #endif | |
911 | ||
912 | #ifdef USE_PAM | |
913 | int | |
914 | mm_answer_pam_start(int sock, Buffer *m) | |
915 | { | |
916 | if (!options.use_pam) | |
917 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
918 | ||
919 | start_pam(authctxt); | |
920 | ||
921 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); | |
922 | ||
923 | return (0); | |
924 | } | |
925 | ||
926 | int | |
927 | mm_answer_pam_account(int sock, Buffer *m) | |
928 | { | |
929 | u_int ret; | |
930 | ||
931 | if (!options.use_pam) | |
932 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
933 | ||
934 | ret = do_pam_account(); | |
935 | ||
936 | buffer_put_int(m, ret); | |
937 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
938 | ||
939 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); | |
940 | ||
941 | return (ret); | |
942 | } | |
943 | ||
944 | static void *sshpam_ctxt, *sshpam_authok; | |
945 | extern KbdintDevice sshpam_device; | |
946 | ||
947 | int | |
948 | mm_answer_pam_init_ctx(int sock, Buffer *m) | |
949 | { | |
950 | ||
951 | debug3("%s", __func__); | |
952 | authctxt->user = buffer_get_string(m, NULL); | |
953 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
954 | sshpam_authok = NULL; | |
955 | buffer_clear(m); | |
956 | if (sshpam_ctxt != NULL) { | |
957 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
958 | buffer_put_int(m, 1); | |
959 | } else { | |
960 | buffer_put_int(m, 0); | |
961 | } | |
962 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); | |
963 | return (0); | |
964 | } | |
965 | ||
966 | int | |
967 | mm_answer_pam_query(int sock, Buffer *m) | |
968 | { | |
969 | char *name, *info, **prompts; | |
970 | u_int i, num, *echo_on; | |
971 | int ret; | |
972 | ||
973 | debug3("%s", __func__); | |
974 | sshpam_authok = NULL; | |
975 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
976 | if (ret == 0 && num == 0) | |
977 | sshpam_authok = sshpam_ctxt; | |
978 | if (num > 1 || name == NULL || info == NULL) | |
979 | ret = -1; | |
980 | buffer_clear(m); | |
981 | buffer_put_int(m, ret); | |
982 | buffer_put_cstring(m, name); | |
983 | xfree(name); | |
984 | buffer_put_cstring(m, info); | |
985 | xfree(info); | |
986 | buffer_put_int(m, num); | |
987 | for (i = 0; i < num; ++i) { | |
988 | buffer_put_cstring(m, prompts[i]); | |
989 | xfree(prompts[i]); | |
990 | buffer_put_int(m, echo_on[i]); | |
991 | } | |
992 | if (prompts != NULL) | |
993 | xfree(prompts); | |
994 | if (echo_on != NULL) | |
995 | xfree(echo_on); | |
996 | auth_method = "keyboard-interactive/pam"; | |
997 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); | |
998 | return (0); | |
999 | } | |
1000 | ||
1001 | int | |
1002 | mm_answer_pam_respond(int sock, Buffer *m) | |
1003 | { | |
1004 | char **resp; | |
1005 | u_int i, num; | |
1006 | int ret; | |
1007 | ||
1008 | debug3("%s", __func__); | |
1009 | sshpam_authok = NULL; | |
1010 | num = buffer_get_int(m); | |
1011 | if (num > 0) { | |
1012 | resp = xcalloc(num, sizeof(char *)); | |
1013 | for (i = 0; i < num; ++i) | |
1014 | resp[i] = buffer_get_string(m, NULL); | |
1015 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
1016 | for (i = 0; i < num; ++i) | |
1017 | xfree(resp[i]); | |
1018 | xfree(resp); | |
1019 | } else { | |
1020 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
1021 | } | |
1022 | buffer_clear(m); | |
1023 | buffer_put_int(m, ret); | |
1024 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); | |
1025 | auth_method = "keyboard-interactive/pam"; | |
1026 | if (ret == 0) | |
1027 | sshpam_authok = sshpam_ctxt; | |
1028 | return (0); | |
1029 | } | |
1030 | ||
1031 | int | |
1032 | mm_answer_pam_free_ctx(int sock, Buffer *m) | |
1033 | { | |
1034 | ||
1035 | debug3("%s", __func__); | |
1036 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
1037 | buffer_clear(m); | |
1038 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); | |
1039 | auth_method = "keyboard-interactive/pam"; | |
1040 | return (sshpam_authok == sshpam_ctxt); | |
1041 | } | |
1042 | #endif | |
1043 | ||
1044 | static void | |
1045 | mm_append_debug(Buffer *m) | |
1046 | { | |
1047 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1048 | debug3("%s: Appending debug messages for child", __func__); | |
1049 | buffer_append(m, buffer_ptr(&auth_debug), | |
1050 | buffer_len(&auth_debug)); | |
1051 | buffer_clear(&auth_debug); | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | int | |
1056 | mm_answer_keyallowed(int sock, Buffer *m) | |
1057 | { | |
1058 | Key *key; | |
1059 | char *cuser, *chost; | |
1060 | u_char *blob; | |
1061 | u_int bloblen; | |
1062 | enum mm_keytype type = 0; | |
1063 | int allowed = 0; | |
1064 | ||
1065 | debug3("%s entering", __func__); | |
1066 | ||
1067 | type = buffer_get_int(m); | |
1068 | cuser = buffer_get_string(m, NULL); | |
1069 | chost = buffer_get_string(m, NULL); | |
1070 | blob = buffer_get_string(m, &bloblen); | |
1071 | ||
1072 | key = key_from_blob(blob, bloblen); | |
1073 | ||
1074 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1075 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1076 | fatal("%s: key type and protocol mismatch", __func__); | |
1077 | ||
1078 | debug3("%s: key_from_blob: %p", __func__, key); | |
1079 | ||
1080 | if (key != NULL && authctxt->valid) { | |
1081 | switch (type) { | |
1082 | case MM_USERKEY: | |
1083 | allowed = options.pubkey_authentication && | |
1084 | user_key_allowed(authctxt->pw, key); | |
1085 | auth_method = "publickey"; | |
1086 | if (options.pubkey_authentication && allowed != 1) | |
1087 | auth_clear_options(); | |
1088 | break; | |
1089 | case MM_HOSTKEY: | |
1090 | allowed = options.hostbased_authentication && | |
1091 | hostbased_key_allowed(authctxt->pw, | |
1092 | cuser, chost, key); | |
1093 | auth_method = "hostbased"; | |
1094 | break; | |
1095 | case MM_RSAHOSTKEY: | |
1096 | key->type = KEY_RSA1; /* XXX */ | |
1097 | allowed = options.rhosts_rsa_authentication && | |
1098 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1099 | cuser, chost, key); | |
1100 | if (options.rhosts_rsa_authentication && allowed != 1) | |
1101 | auth_clear_options(); | |
1102 | auth_method = "rsa"; | |
1103 | break; | |
1104 | default: | |
1105 | fatal("%s: unknown key type %d", __func__, type); | |
1106 | break; | |
1107 | } | |
1108 | } | |
1109 | if (key != NULL) | |
1110 | key_free(key); | |
1111 | ||
1112 | /* clear temporarily storage (used by verify) */ | |
1113 | monitor_reset_key_state(); | |
1114 | ||
1115 | if (allowed) { | |
1116 | /* Save temporarily for comparison in verify */ | |
1117 | key_blob = blob; | |
1118 | key_bloblen = bloblen; | |
1119 | key_blobtype = type; | |
1120 | hostbased_cuser = cuser; | |
1121 | hostbased_chost = chost; | |
1122 | } else { | |
1123 | /* Log failed attempt */ | |
1124 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
1125 | xfree(blob); | |
1126 | xfree(cuser); | |
1127 | xfree(chost); | |
1128 | } | |
1129 | ||
1130 | debug3("%s: key %p is %s", | |
1131 | __func__, key, allowed ? "allowed" : "not allowed"); | |
1132 | ||
1133 | buffer_clear(m); | |
1134 | buffer_put_int(m, allowed); | |
1135 | buffer_put_int(m, forced_command != NULL); | |
1136 | ||
1137 | mm_append_debug(m); | |
1138 | ||
1139 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); | |
1140 | ||
1141 | if (type == MM_RSAHOSTKEY) | |
1142 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1143 | ||
1144 | return (0); | |
1145 | } | |
1146 | ||
1147 | static int | |
1148 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1149 | { | |
1150 | Buffer b; | |
1151 | char *p; | |
1152 | u_int len; | |
1153 | int fail = 0; | |
1154 | ||
1155 | buffer_init(&b); | |
1156 | buffer_append(&b, data, datalen); | |
1157 | ||
1158 | if (datafellows & SSH_OLD_SESSIONID) { | |
1159 | p = buffer_ptr(&b); | |
1160 | len = buffer_len(&b); | |
1161 | if ((session_id2 == NULL) || | |
1162 | (len < session_id2_len) || | |
1163 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1164 | fail++; | |
1165 | buffer_consume(&b, session_id2_len); | |
1166 | } else { | |
1167 | p = buffer_get_string(&b, &len); | |
1168 | if ((session_id2 == NULL) || | |
1169 | (len != session_id2_len) || | |
1170 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1171 | fail++; | |
1172 | xfree(p); | |
1173 | } | |
1174 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1175 | fail++; | |
1176 | p = buffer_get_string(&b, NULL); | |
1177 | if (strcmp(authctxt->user, p) != 0) { | |
1178 | logit("wrong user name passed to monitor: expected %s != %.100s", | |
1179 | authctxt->user, p); | |
1180 | fail++; | |
1181 | } | |
1182 | xfree(p); | |
1183 | buffer_skip_string(&b); | |
1184 | if (datafellows & SSH_BUG_PKAUTH) { | |
1185 | if (!buffer_get_char(&b)) | |
1186 | fail++; | |
1187 | } else { | |
1188 | p = buffer_get_string(&b, NULL); | |
1189 | if (strcmp("publickey", p) != 0) | |
1190 | fail++; | |
1191 | xfree(p); | |
1192 | if (!buffer_get_char(&b)) | |
1193 | fail++; | |
1194 | buffer_skip_string(&b); | |
1195 | } | |
1196 | buffer_skip_string(&b); | |
1197 | if (buffer_len(&b) != 0) | |
1198 | fail++; | |
1199 | buffer_free(&b); | |
1200 | return (fail == 0); | |
1201 | } | |
1202 | ||
1203 | static int | |
1204 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, | |
1205 | char *chost) | |
1206 | { | |
1207 | Buffer b; | |
1208 | char *p; | |
1209 | u_int len; | |
1210 | int fail = 0; | |
1211 | ||
1212 | buffer_init(&b); | |
1213 | buffer_append(&b, data, datalen); | |
1214 | ||
1215 | p = buffer_get_string(&b, &len); | |
1216 | if ((session_id2 == NULL) || | |
1217 | (len != session_id2_len) || | |
1218 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1219 | fail++; | |
1220 | xfree(p); | |
1221 | ||
1222 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1223 | fail++; | |
1224 | p = buffer_get_string(&b, NULL); | |
1225 | if (strcmp(authctxt->user, p) != 0) { | |
1226 | logit("wrong user name passed to monitor: expected %s != %.100s", | |
1227 | authctxt->user, p); | |
1228 | fail++; | |
1229 | } | |
1230 | xfree(p); | |
1231 | buffer_skip_string(&b); /* service */ | |
1232 | p = buffer_get_string(&b, NULL); | |
1233 | if (strcmp(p, "hostbased") != 0) | |
1234 | fail++; | |
1235 | xfree(p); | |
1236 | buffer_skip_string(&b); /* pkalg */ | |
1237 | buffer_skip_string(&b); /* pkblob */ | |
1238 | ||
1239 | /* verify client host, strip trailing dot if necessary */ | |
1240 | p = buffer_get_string(&b, NULL); | |
1241 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1242 | p[len - 1] = '\0'; | |
1243 | if (strcmp(p, chost) != 0) | |
1244 | fail++; | |
1245 | xfree(p); | |
1246 | ||
1247 | /* verify client user */ | |
1248 | p = buffer_get_string(&b, NULL); | |
1249 | if (strcmp(p, cuser) != 0) | |
1250 | fail++; | |
1251 | xfree(p); | |
1252 | ||
1253 | if (buffer_len(&b) != 0) | |
1254 | fail++; | |
1255 | buffer_free(&b); | |
1256 | return (fail == 0); | |
1257 | } | |
1258 | ||
1259 | int | |
1260 | mm_answer_keyverify(int sock, Buffer *m) | |
1261 | { | |
1262 | Key *key; | |
1263 | u_char *signature, *data, *blob; | |
1264 | u_int signaturelen, datalen, bloblen; | |
1265 | int verified = 0; | |
1266 | int valid_data = 0; | |
1267 | ||
1268 | blob = buffer_get_string(m, &bloblen); | |
1269 | signature = buffer_get_string(m, &signaturelen); | |
1270 | data = buffer_get_string(m, &datalen); | |
1271 | ||
1272 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
1273 | !monitor_allowed_key(blob, bloblen)) | |
1274 | fatal("%s: bad key, not previously allowed", __func__); | |
1275 | ||
1276 | key = key_from_blob(blob, bloblen); | |
1277 | if (key == NULL) | |
1278 | fatal("%s: bad public key blob", __func__); | |
1279 | ||
1280 | switch (key_blobtype) { | |
1281 | case MM_USERKEY: | |
1282 | valid_data = monitor_valid_userblob(data, datalen); | |
1283 | break; | |
1284 | case MM_HOSTKEY: | |
1285 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1286 | hostbased_cuser, hostbased_chost); | |
1287 | break; | |
1288 | default: | |
1289 | valid_data = 0; | |
1290 | break; | |
1291 | } | |
1292 | if (!valid_data) | |
1293 | fatal("%s: bad signature data blob", __func__); | |
1294 | ||
1295 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1296 | debug3("%s: key %p signature %s", | |
1297 | __func__, key, (verified == 1) ? "verified" : "unverified"); | |
1298 | ||
1299 | key_free(key); | |
1300 | xfree(blob); | |
1301 | xfree(signature); | |
1302 | xfree(data); | |
1303 | ||
1304 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; | |
1305 | ||
1306 | monitor_reset_key_state(); | |
1307 | ||
1308 | buffer_clear(m); | |
1309 | buffer_put_int(m, verified); | |
1310 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); | |
1311 | ||
1312 | return (verified == 1); | |
1313 | } | |
1314 | ||
1315 | static void | |
1316 | mm_record_login(Session *s, struct passwd *pw) | |
1317 | { | |
1318 | socklen_t fromlen; | |
1319 | struct sockaddr_storage from; | |
1320 | ||
1321 | /* | |
1322 | * Get IP address of client. If the connection is not a socket, let | |
1323 | * the address be 0.0.0.0. | |
1324 | */ | |
1325 | memset(&from, 0, sizeof(from)); | |
1326 | fromlen = sizeof(from); | |
1327 | if (packet_connection_is_on_socket()) { | |
1328 | if (getpeername(packet_get_connection_in(), | |
1329 | (struct sockaddr *)&from, &fromlen) < 0) { | |
1330 | debug("getpeername: %.100s", strerror(errno)); | |
1331 | cleanup_exit(255); | |
1332 | } | |
1333 | } | |
1334 | /* Record that there was a login on that tty from the remote host. */ | |
1335 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
1336 | get_remote_name_or_ip(utmp_len, options.use_dns), | |
1337 | (struct sockaddr *)&from, fromlen); | |
1338 | } | |
1339 | ||
1340 | static void | |
1341 | mm_session_close(Session *s) | |
1342 | { | |
1343 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); | |
1344 | if (s->ttyfd != -1) { | |
1345 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); | |
1346 | session_pty_cleanup2(s); | |
1347 | } | |
1348 | session_unused(s->self); | |
1349 | } | |
1350 | ||
1351 | int | |
1352 | mm_answer_pty(int sock, Buffer *m) | |
1353 | { | |
1354 | extern struct monitor *pmonitor; | |
1355 | Session *s; | |
1356 | int res, fd0; | |
1357 | ||
1358 | debug3("%s entering", __func__); | |
1359 | ||
1360 | buffer_clear(m); | |
1361 | s = session_new(); | |
1362 | if (s == NULL) | |
1363 | goto error; | |
1364 | s->authctxt = authctxt; | |
1365 | s->pw = authctxt->pw; | |
1366 | s->pid = pmonitor->m_pid; | |
1367 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); | |
1368 | if (res == 0) | |
1369 | goto error; | |
1370 | pty_setowner(authctxt->pw, s->tty); | |
1371 | ||
1372 | buffer_put_int(m, 1); | |
1373 | buffer_put_cstring(m, s->tty); | |
1374 | ||
1375 | /* We need to trick ttyslot */ | |
1376 | if (dup2(s->ttyfd, 0) == -1) | |
1377 | fatal("%s: dup2", __func__); | |
1378 | ||
1379 | mm_record_login(s, authctxt->pw); | |
1380 | ||
1381 | /* Now we can close the file descriptor again */ | |
1382 | close(0); | |
1383 | ||
1384 | /* send messages generated by record_login */ | |
1385 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1386 | buffer_clear(&loginmsg); | |
1387 | ||
1388 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1389 | ||
1390 | if (mm_send_fd(sock, s->ptyfd) == -1 || | |
1391 | mm_send_fd(sock, s->ttyfd) == -1) | |
1392 | fatal("%s: send fds failed", __func__); | |
1393 | ||
1394 | /* make sure nothing uses fd 0 */ | |
1395 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1396 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); | |
1397 | if (fd0 != 0) | |
1398 | error("%s: fd0 %d != 0", __func__, fd0); | |
1399 | ||
1400 | /* slave is not needed */ | |
1401 | close(s->ttyfd); | |
1402 | s->ttyfd = s->ptyfd; | |
1403 | /* no need to dup() because nobody closes ptyfd */ | |
1404 | s->ptymaster = s->ptyfd; | |
1405 | ||
1406 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); | |
1407 | ||
1408 | return (0); | |
1409 | ||
1410 | error: | |
1411 | if (s != NULL) | |
1412 | mm_session_close(s); | |
1413 | buffer_put_int(m, 0); | |
1414 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1415 | return (0); | |
1416 | } | |
1417 | ||
1418 | int | |
1419 | mm_answer_pty_cleanup(int sock, Buffer *m) | |
1420 | { | |
1421 | Session *s; | |
1422 | char *tty; | |
1423 | ||
1424 | debug3("%s entering", __func__); | |
1425 | ||
1426 | tty = buffer_get_string(m, NULL); | |
1427 | if ((s = session_by_tty(tty)) != NULL) | |
1428 | mm_session_close(s); | |
1429 | buffer_clear(m); | |
1430 | xfree(tty); | |
1431 | return (0); | |
1432 | } | |
1433 | ||
1434 | int | |
1435 | mm_answer_sesskey(int sock, Buffer *m) | |
1436 | { | |
1437 | BIGNUM *p; | |
1438 | int rsafail; | |
1439 | ||
1440 | /* Turn off permissions */ | |
1441 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); | |
1442 | ||
1443 | if ((p = BN_new()) == NULL) | |
1444 | fatal("%s: BN_new", __func__); | |
1445 | ||
1446 | buffer_get_bignum2(m, p); | |
1447 | ||
1448 | rsafail = ssh1_session_key(p); | |
1449 | ||
1450 | buffer_clear(m); | |
1451 | buffer_put_int(m, rsafail); | |
1452 | buffer_put_bignum2(m, p); | |
1453 | ||
1454 | BN_clear_free(p); | |
1455 | ||
1456 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); | |
1457 | ||
1458 | /* Turn on permissions for sessid passing */ | |
1459 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1460 | ||
1461 | return (0); | |
1462 | } | |
1463 | ||
1464 | int | |
1465 | mm_answer_sessid(int sock, Buffer *m) | |
1466 | { | |
1467 | int i; | |
1468 | ||
1469 | debug3("%s entering", __func__); | |
1470 | ||
1471 | if (buffer_len(m) != 16) | |
1472 | fatal("%s: bad ssh1 session id", __func__); | |
1473 | for (i = 0; i < 16; i++) | |
1474 | session_id[i] = buffer_get_char(m); | |
1475 | ||
1476 | /* Turn on permissions for getpwnam */ | |
1477 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1478 | ||
1479 | return (0); | |
1480 | } | |
1481 | ||
1482 | int | |
1483 | mm_answer_rsa_keyallowed(int sock, Buffer *m) | |
1484 | { | |
1485 | BIGNUM *client_n; | |
1486 | Key *key = NULL; | |
1487 | u_char *blob = NULL; | |
1488 | u_int blen = 0; | |
1489 | int allowed = 0; | |
1490 | ||
1491 | debug3("%s entering", __func__); | |
1492 | ||
1493 | auth_method = "rsa"; | |
1494 | if (options.rsa_authentication && authctxt->valid) { | |
1495 | if ((client_n = BN_new()) == NULL) | |
1496 | fatal("%s: BN_new", __func__); | |
1497 | buffer_get_bignum2(m, client_n); | |
1498 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1499 | BN_clear_free(client_n); | |
1500 | } | |
1501 | buffer_clear(m); | |
1502 | buffer_put_int(m, allowed); | |
1503 | buffer_put_int(m, forced_command != NULL); | |
1504 | ||
1505 | /* clear temporarily storage (used by generate challenge) */ | |
1506 | monitor_reset_key_state(); | |
1507 | ||
1508 | if (allowed && key != NULL) { | |
1509 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1510 | if (key_to_blob(key, &blob, &blen) == 0) | |
1511 | fatal("%s: key_to_blob failed", __func__); | |
1512 | buffer_put_string(m, blob, blen); | |
1513 | ||
1514 | /* Save temporarily for comparison in verify */ | |
1515 | key_blob = blob; | |
1516 | key_bloblen = blen; | |
1517 | key_blobtype = MM_RSAUSERKEY; | |
1518 | } | |
1519 | if (key != NULL) | |
1520 | key_free(key); | |
1521 | ||
1522 | mm_append_debug(m); | |
1523 | ||
1524 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); | |
1525 | ||
1526 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1527 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1528 | return (0); | |
1529 | } | |
1530 | ||
1531 | int | |
1532 | mm_answer_rsa_challenge(int sock, Buffer *m) | |
1533 | { | |
1534 | Key *key = NULL; | |
1535 | u_char *blob; | |
1536 | u_int blen; | |
1537 | ||
1538 | debug3("%s entering", __func__); | |
1539 | ||
1540 | if (!authctxt->valid) | |
1541 | fatal("%s: authctxt not valid", __func__); | |
1542 | blob = buffer_get_string(m, &blen); | |
1543 | if (!monitor_allowed_key(blob, blen)) | |
1544 | fatal("%s: bad key, not previously allowed", __func__); | |
1545 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) | |
1546 | fatal("%s: key type mismatch", __func__); | |
1547 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1548 | fatal("%s: received bad key", __func__); | |
1549 | if (key->type != KEY_RSA) | |
1550 | fatal("%s: received bad key type %d", __func__, key->type); | |
1551 | key->type = KEY_RSA1; | |
1552 | if (ssh1_challenge) | |
1553 | BN_clear_free(ssh1_challenge); | |
1554 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1555 | ||
1556 | buffer_clear(m); | |
1557 | buffer_put_bignum2(m, ssh1_challenge); | |
1558 | ||
1559 | debug3("%s sending reply", __func__); | |
1560 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); | |
1561 | ||
1562 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
1563 | ||
1564 | xfree(blob); | |
1565 | key_free(key); | |
1566 | return (0); | |
1567 | } | |
1568 | ||
1569 | int | |
1570 | mm_answer_rsa_response(int sock, Buffer *m) | |
1571 | { | |
1572 | Key *key = NULL; | |
1573 | u_char *blob, *response; | |
1574 | u_int blen, len; | |
1575 | int success; | |
1576 | ||
1577 | debug3("%s entering", __func__); | |
1578 | ||
1579 | if (!authctxt->valid) | |
1580 | fatal("%s: authctxt not valid", __func__); | |
1581 | if (ssh1_challenge == NULL) | |
1582 | fatal("%s: no ssh1_challenge", __func__); | |
1583 | ||
1584 | blob = buffer_get_string(m, &blen); | |
1585 | if (!monitor_allowed_key(blob, blen)) | |
1586 | fatal("%s: bad key, not previously allowed", __func__); | |
1587 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) | |
1588 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); | |
1589 | if ((key = key_from_blob(blob, blen)) == NULL) | |
1590 | fatal("%s: received bad key", __func__); | |
1591 | response = buffer_get_string(m, &len); | |
1592 | if (len != 16) | |
1593 | fatal("%s: received bad response to challenge", __func__); | |
1594 | success = auth_rsa_verify_response(key, ssh1_challenge, response); | |
1595 | ||
1596 | xfree(blob); | |
1597 | key_free(key); | |
1598 | xfree(response); | |
1599 | ||
1600 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1601 | ||
1602 | /* reset state */ | |
1603 | BN_clear_free(ssh1_challenge); | |
1604 | ssh1_challenge = NULL; | |
1605 | monitor_reset_key_state(); | |
1606 | ||
1607 | buffer_clear(m); | |
1608 | buffer_put_int(m, success); | |
1609 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); | |
1610 | ||
1611 | return (success); | |
1612 | } | |
1613 | ||
1614 | int | |
1615 | mm_answer_term(int sock, Buffer *req) | |
1616 | { | |
1617 | extern struct monitor *pmonitor; | |
1618 | int res, status; | |
1619 | ||
1620 | debug3("%s: tearing down sessions", __func__); | |
1621 | ||
1622 | /* The child is terminating */ | |
1623 | session_destroy_all(&mm_session_close); | |
1624 | ||
1625 | #ifdef USE_PAM | |
1626 | if (options.use_pam) | |
1627 | sshpam_cleanup(); | |
1628 | #endif | |
1629 | ||
1630 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) | |
1631 | if (errno != EINTR) | |
1632 | exit(1); | |
1633 | ||
1634 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1635 | ||
1636 | /* Terminate process */ | |
1637 | exit(res); | |
1638 | } | |
1639 | ||
1640 | #ifdef SSH_AUDIT_EVENTS | |
1641 | /* Report that an audit event occurred */ | |
1642 | int | |
1643 | mm_answer_audit_event(int socket, Buffer *m) | |
1644 | { | |
1645 | ssh_audit_event_t event; | |
1646 | ||
1647 | debug3("%s entering", __func__); | |
1648 | ||
1649 | event = buffer_get_int(m); | |
1650 | switch(event) { | |
1651 | case SSH_AUTH_FAIL_PUBKEY: | |
1652 | case SSH_AUTH_FAIL_HOSTBASED: | |
1653 | case SSH_AUTH_FAIL_GSSAPI: | |
1654 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1655 | case SSH_LOGIN_ROOT_DENIED: | |
1656 | case SSH_CONNECTION_CLOSE: | |
1657 | case SSH_INVALID_USER: | |
1658 | audit_event(event); | |
1659 | break; | |
1660 | default: | |
1661 | fatal("Audit event type %d not permitted", event); | |
1662 | } | |
1663 | ||
1664 | return (0); | |
1665 | } | |
1666 | ||
1667 | int | |
1668 | mm_answer_audit_command(int socket, Buffer *m) | |
1669 | { | |
1670 | u_int len; | |
1671 | char *cmd; | |
1672 | ||
1673 | debug3("%s entering", __func__); | |
1674 | cmd = buffer_get_string(m, &len); | |
1675 | /* sanity check command, if so how? */ | |
1676 | audit_run_command(cmd); | |
1677 | xfree(cmd); | |
1678 | return (0); | |
1679 | } | |
1680 | #endif /* SSH_AUDIT_EVENTS */ | |
1681 | ||
1682 | void | |
1683 | monitor_apply_keystate(struct monitor *pmonitor) | |
1684 | { | |
1685 | if (compat20) { | |
1686 | set_newkeys(MODE_IN); | |
1687 | set_newkeys(MODE_OUT); | |
1688 | } else { | |
1689 | packet_set_protocol_flags(child_state.ssh1protoflags); | |
1690 | packet_set_encryption_key(child_state.ssh1key, | |
1691 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1692 | xfree(child_state.ssh1key); | |
1693 | } | |
1694 | ||
1695 | /* for rc4 and other stateful ciphers */ | |
1696 | packet_set_keycontext(MODE_OUT, child_state.keyout); | |
1697 | xfree(child_state.keyout); | |
1698 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1699 | xfree(child_state.keyin); | |
1700 | ||
1701 | if (!compat20) { | |
1702 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1703 | xfree(child_state.ivout); | |
1704 | packet_set_iv(MODE_IN, child_state.ivin); | |
1705 | xfree(child_state.ivin); | |
1706 | } | |
1707 | ||
1708 | memcpy(&incoming_stream, &child_state.incoming, | |
1709 | sizeof(incoming_stream)); | |
1710 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1711 | sizeof(outgoing_stream)); | |
1712 | ||
1713 | /* Update with new address */ | |
1714 | if (options.compression) | |
1715 | mm_init_compression(pmonitor->m_zlib); | |
1716 | ||
1717 | /* Network I/O buffers */ | |
1718 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1719 | buffer_clear(packet_get_input()); | |
1720 | buffer_append(packet_get_input(), child_state.input, child_state.ilen); | |
1721 | memset(child_state.input, 0, child_state.ilen); | |
1722 | xfree(child_state.input); | |
1723 | ||
1724 | buffer_clear(packet_get_output()); | |
1725 | buffer_append(packet_get_output(), child_state.output, | |
1726 | child_state.olen); | |
1727 | memset(child_state.output, 0, child_state.olen); | |
1728 | xfree(child_state.output); | |
1729 | ||
1730 | /* Roaming */ | |
1731 | if (compat20) | |
1732 | roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes); | |
1733 | } | |
1734 | ||
1735 | static Kex * | |
1736 | mm_get_kex(Buffer *m) | |
1737 | { | |
1738 | Kex *kex; | |
1739 | void *blob; | |
1740 | u_int bloblen; | |
1741 | ||
1742 | kex = xcalloc(1, sizeof(*kex)); | |
1743 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
1744 | if ((session_id2 == NULL) || | |
1745 | (kex->session_id_len != session_id2_len) || | |
1746 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1747 | fatal("mm_get_get: internal error: bad session id"); | |
1748 | kex->we_need = buffer_get_int(m); | |
1749 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; | |
1750 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; | |
1751 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; | |
1752 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; | |
1753 | #ifdef GSSAPI | |
1754 | if (options.gss_keyex) { | |
1755 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; | |
1756 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server; | |
1757 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server; | |
1758 | } | |
1759 | #endif | |
1760 | kex->server = 1; | |
1761 | kex->hostkey_type = buffer_get_int(m); | |
1762 | kex->kex_type = buffer_get_int(m); | |
1763 | blob = buffer_get_string(m, &bloblen); | |
1764 | buffer_init(&kex->my); | |
1765 | buffer_append(&kex->my, blob, bloblen); | |
1766 | xfree(blob); | |
1767 | blob = buffer_get_string(m, &bloblen); | |
1768 | buffer_init(&kex->peer); | |
1769 | buffer_append(&kex->peer, blob, bloblen); | |
1770 | xfree(blob); | |
1771 | kex->done = 1; | |
1772 | kex->flags = buffer_get_int(m); | |
1773 | kex->client_version_string = buffer_get_string(m, NULL); | |
1774 | kex->server_version_string = buffer_get_string(m, NULL); | |
1775 | kex->load_host_key=&get_hostkey_by_type; | |
1776 | kex->host_key_index=&get_hostkey_index; | |
1777 | ||
1778 | return (kex); | |
1779 | } | |
1780 | ||
1781 | /* This function requries careful sanity checking */ | |
1782 | ||
1783 | void | |
1784 | mm_get_keystate(struct monitor *pmonitor) | |
1785 | { | |
1786 | Buffer m; | |
1787 | u_char *blob, *p; | |
1788 | u_int bloblen, plen; | |
1789 | u_int32_t seqnr, packets; | |
1790 | u_int64_t blocks, bytes; | |
1791 | ||
1792 | debug3("%s: Waiting for new keys", __func__); | |
1793 | ||
1794 | buffer_init(&m); | |
1795 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); | |
1796 | if (!compat20) { | |
1797 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1798 | child_state.ssh1cipher = buffer_get_int(&m); | |
1799 | child_state.ssh1key = buffer_get_string(&m, | |
1800 | &child_state.ssh1keylen); | |
1801 | child_state.ivout = buffer_get_string(&m, | |
1802 | &child_state.ivoutlen); | |
1803 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1804 | goto skip; | |
1805 | } else { | |
1806 | /* Get the Kex for rekeying */ | |
1807 | *pmonitor->m_pkex = mm_get_kex(&m); | |
1808 | } | |
1809 | ||
1810 | blob = buffer_get_string(&m, &bloblen); | |
1811 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1812 | xfree(blob); | |
1813 | ||
1814 | debug3("%s: Waiting for second key", __func__); | |
1815 | blob = buffer_get_string(&m, &bloblen); | |
1816 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1817 | xfree(blob); | |
1818 | ||
1819 | /* Now get sequence numbers for the packets */ | |
1820 | seqnr = buffer_get_int(&m); | |
1821 | blocks = buffer_get_int64(&m); | |
1822 | packets = buffer_get_int(&m); | |
1823 | bytes = buffer_get_int64(&m); | |
1824 | packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); | |
1825 | seqnr = buffer_get_int(&m); | |
1826 | blocks = buffer_get_int64(&m); | |
1827 | packets = buffer_get_int(&m); | |
1828 | bytes = buffer_get_int64(&m); | |
1829 | packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); | |
1830 | ||
1831 | skip: | |
1832 | /* Get the key context */ | |
1833 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1834 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1835 | ||
1836 | debug3("%s: Getting compression state", __func__); | |
1837 | /* Get compression state */ | |
1838 | p = buffer_get_string(&m, &plen); | |
1839 | if (plen != sizeof(child_state.outgoing)) | |
1840 | fatal("%s: bad request size", __func__); | |
1841 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); | |
1842 | xfree(p); | |
1843 | ||
1844 | p = buffer_get_string(&m, &plen); | |
1845 | if (plen != sizeof(child_state.incoming)) | |
1846 | fatal("%s: bad request size", __func__); | |
1847 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); | |
1848 | xfree(p); | |
1849 | ||
1850 | /* Network I/O buffers */ | |
1851 | debug3("%s: Getting Network I/O buffers", __func__); | |
1852 | child_state.input = buffer_get_string(&m, &child_state.ilen); | |
1853 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1854 | ||
1855 | /* Roaming */ | |
1856 | if (compat20) { | |
1857 | child_state.sent_bytes = buffer_get_int64(&m); | |
1858 | child_state.recv_bytes = buffer_get_int64(&m); | |
1859 | } | |
1860 | ||
1861 | buffer_free(&m); | |
1862 | } | |
1863 | ||
1864 | ||
1865 | /* Allocation functions for zlib */ | |
1866 | void * | |
1867 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1868 | { | |
1869 | size_t len = (size_t) size * ncount; | |
1870 | void *address; | |
1871 | ||
1872 | if (len == 0 || ncount > SIZE_T_MAX / size) | |
1873 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); | |
1874 | ||
1875 | address = mm_malloc(mm, len); | |
1876 | ||
1877 | return (address); | |
1878 | } | |
1879 | ||
1880 | void | |
1881 | mm_zfree(struct mm_master *mm, void *address) | |
1882 | { | |
1883 | mm_free(mm, address); | |
1884 | } | |
1885 | ||
1886 | void | |
1887 | mm_init_compression(struct mm_master *mm) | |
1888 | { | |
1889 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1890 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1891 | outgoing_stream.opaque = mm; | |
1892 | ||
1893 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1894 | incoming_stream.zfree = (free_func)mm_zfree; | |
1895 | incoming_stream.opaque = mm; | |
1896 | } | |
1897 | ||
1898 | /* XXX */ | |
1899 | ||
1900 | #define FD_CLOSEONEXEC(x) do { \ | |
1901 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1902 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1903 | } while (0) | |
1904 | ||
1905 | static void | |
1906 | monitor_socketpair(int *pair) | |
1907 | { | |
1908 | #ifdef HAVE_SOCKETPAIR | |
1909 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) | |
1910 | fatal("%s: socketpair", __func__); | |
1911 | #else | |
1912 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1913 | __func__); | |
1914 | #endif | |
1915 | FD_CLOSEONEXEC(pair[0]); | |
1916 | FD_CLOSEONEXEC(pair[1]); | |
1917 | } | |
1918 | ||
1919 | #define MM_MEMSIZE 65536 | |
1920 | ||
1921 | struct monitor * | |
1922 | monitor_init(void) | |
1923 | { | |
1924 | struct monitor *mon; | |
1925 | int pair[2]; | |
1926 | ||
1927 | mon = xcalloc(1, sizeof(*mon)); | |
1928 | ||
1929 | monitor_socketpair(pair); | |
1930 | ||
1931 | mon->m_recvfd = pair[0]; | |
1932 | mon->m_sendfd = pair[1]; | |
1933 | ||
1934 | /* Used to share zlib space across processes */ | |
1935 | if (options.compression) { | |
1936 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1937 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1938 | ||
1939 | /* Compression needs to share state across borders */ | |
1940 | mm_init_compression(mon->m_zlib); | |
1941 | } | |
1942 | ||
1943 | return mon; | |
1944 | } | |
1945 | ||
1946 | void | |
1947 | monitor_reinit(struct monitor *mon) | |
1948 | { | |
1949 | int pair[2]; | |
1950 | ||
1951 | monitor_socketpair(pair); | |
1952 | ||
1953 | mon->m_recvfd = pair[0]; | |
1954 | mon->m_sendfd = pair[1]; | |
1955 | } | |
1956 | ||
1957 | #ifdef GSSAPI | |
1958 | int | |
1959 | mm_answer_gss_setup_ctx(int sock, Buffer *m) | |
1960 | { | |
1961 | gss_OID_desc goid; | |
1962 | OM_uint32 major; | |
1963 | u_int len; | |
1964 | ||
1965 | if (!options.gss_authentication && !options.gss_keyex) | |
1966 | fatal("In GSSAPI monitor when GSSAPI is disabled"); | |
1967 | ||
1968 | goid.elements = buffer_get_string(m, &len); | |
1969 | goid.length = len; | |
1970 | ||
1971 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); | |
1972 | ||
1973 | xfree(goid.elements); | |
1974 | ||
1975 | buffer_clear(m); | |
1976 | buffer_put_int(m, major); | |
1977 | ||
1978 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); | |
1979 | ||
1980 | /* Now we have a context, enable the step */ | |
1981 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1982 | ||
1983 | return (0); | |
1984 | } | |
1985 | ||
1986 | int | |
1987 | mm_answer_gss_accept_ctx(int sock, Buffer *m) | |
1988 | { | |
1989 | gss_buffer_desc in; | |
1990 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1991 | OM_uint32 major, minor; | |
1992 | OM_uint32 flags = 0; /* GSI needs this */ | |
1993 | u_int len; | |
1994 | ||
1995 | if (!options.gss_authentication && !options.gss_keyex) | |
1996 | fatal("In GSSAPI monitor when GSSAPI is disabled"); | |
1997 | ||
1998 | in.value = buffer_get_string(m, &len); | |
1999 | in.length = len; | |
2000 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); | |
2001 | xfree(in.value); | |
2002 | ||
2003 | buffer_clear(m); | |
2004 | buffer_put_int(m, major); | |
2005 | buffer_put_string(m, out.value, out.length); | |
2006 | buffer_put_int(m, flags); | |
2007 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); | |
2008 | ||
2009 | gss_release_buffer(&minor, &out); | |
2010 | ||
2011 | if (major == GSS_S_COMPLETE) { | |
2012 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); | |
2013 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
2014 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); | |
2015 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); | |
2016 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); | |
2017 | } | |
2018 | return (0); | |
2019 | } | |
2020 | ||
2021 | int | |
2022 | mm_answer_gss_checkmic(int sock, Buffer *m) | |
2023 | { | |
2024 | gss_buffer_desc gssbuf, mic; | |
2025 | OM_uint32 ret; | |
2026 | u_int len; | |
2027 | ||
2028 | if (!options.gss_authentication && !options.gss_keyex) | |
2029 | fatal("In GSSAPI monitor when GSSAPI is disabled"); | |
2030 | ||
2031 | gssbuf.value = buffer_get_string(m, &len); | |
2032 | gssbuf.length = len; | |
2033 | mic.value = buffer_get_string(m, &len); | |
2034 | mic.length = len; | |
2035 | ||
2036 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); | |
2037 | ||
2038 | xfree(gssbuf.value); | |
2039 | xfree(mic.value); | |
2040 | ||
2041 | buffer_clear(m); | |
2042 | buffer_put_int(m, ret); | |
2043 | ||
2044 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); | |
2045 | ||
2046 | if (!GSS_ERROR(ret)) | |
2047 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
2048 | ||
2049 | return (0); | |
2050 | } | |
2051 | ||
2052 | int | |
2053 | mm_answer_gss_userok(int sock, Buffer *m) | |
2054 | { | |
2055 | int authenticated; | |
2056 | int gssapi_keyex; | |
2057 | ||
2058 | if (!options.gss_authentication && !options.gss_keyex) | |
2059 | fatal("In GSSAPI monitor when GSSAPI is disabled"); | |
2060 | ||
2061 | gssapi_keyex = buffer_get_int(m); | |
2062 | ||
2063 | authenticated = authctxt->valid && | |
2064 | ssh_gssapi_userok(authctxt->user, authctxt->pw, gssapi_keyex); | |
2065 | ||
2066 | buffer_clear(m); | |
2067 | buffer_put_int(m, authenticated); | |
2068 | ||
2069 | debug3("%s: sending result %d", __func__, authenticated); | |
2070 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); | |
2071 | ||
2072 | if (gssapi_keyex) | |
2073 | auth_method = "gssapi-keyex"; | |
2074 | else | |
2075 | auth_method = "gssapi-with-mic"; | |
2076 | ||
2077 | /* Monitor loop will terminate if authenticated */ | |
2078 | return (authenticated); | |
2079 | } | |
2080 | ||
2081 | int | |
2082 | mm_answer_gss_error(int socket, Buffer *m) { | |
2083 | OM_uint32 major,minor; | |
2084 | char *msg; | |
2085 | ||
2086 | msg=ssh_gssapi_last_error(gsscontext,&major,&minor); | |
2087 | buffer_clear(m); | |
2088 | buffer_put_int(m,major); | |
2089 | buffer_put_int(m,minor); | |
2090 | buffer_put_cstring(m,msg); | |
2091 | ||
2092 | mm_request_send(socket,MONITOR_ANS_GSSERR,m); | |
2093 | ||
2094 | xfree(msg); | |
2095 | ||
2096 | return(0); | |
2097 | } | |
2098 | ||
2099 | int | |
2100 | mm_answer_gss_indicate_mechs(int socket, Buffer *m) { | |
2101 | OM_uint32 major,minor; | |
2102 | gss_OID_set mech_set; | |
2103 | size_t i; | |
2104 | ||
2105 | major=gss_indicate_mechs(&minor, &mech_set); | |
2106 | ||
2107 | buffer_clear(m); | |
2108 | buffer_put_int(m, major); | |
2109 | buffer_put_int(m, mech_set->count); | |
2110 | for (i=0; i < mech_set->count; i++) { | |
2111 | buffer_put_string(m, mech_set->elements[i].elements, | |
2112 | mech_set->elements[i].length); | |
2113 | } | |
2114 | ||
2115 | #if !defined(MECHGLUE) /* mechglue memory management bug ??? */ | |
2116 | gss_release_oid_set(&minor,&mech_set); | |
2117 | #endif | |
2118 | ||
2119 | mm_request_send(socket,MONITOR_ANS_GSSMECHS,m); | |
2120 | ||
2121 | return(0); | |
2122 | } | |
2123 | ||
2124 | int | |
2125 | mm_answer_gss_localname(int socket, Buffer *m) { | |
2126 | char *name; | |
2127 | ||
2128 | ssh_gssapi_localname(&name); | |
2129 | ||
2130 | buffer_clear(m); | |
2131 | if (name) { | |
2132 | buffer_put_cstring(m, name); | |
2133 | debug3("%s: sending result %s", __func__, name); | |
2134 | xfree(name); | |
2135 | } else { | |
2136 | buffer_put_cstring(m, ""); | |
2137 | debug3("%s: sending result \"\"", __func__); | |
2138 | } | |
2139 | ||
2140 | mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m); | |
2141 | ||
2142 | return(0); | |
2143 | } | |
2144 | ||
2145 | int | |
2146 | mm_answer_gss_sign(int socket, Buffer *m) | |
2147 | { | |
2148 | gss_buffer_desc data; | |
2149 | gss_buffer_desc hash = GSS_C_EMPTY_BUFFER; | |
2150 | OM_uint32 major, minor; | |
2151 | u_int len; | |
2152 | ||
2153 | if (!options.gss_authentication && !options.gss_keyex) | |
2154 | fatal("In GSSAPI monitor when GSSAPI is disabled"); | |
2155 | ||
2156 | data.value = buffer_get_string(m, &len); | |
2157 | data.length = len; | |
2158 | if (data.length != 20) | |
2159 | fatal("%s: data length incorrect: %d", __func__, | |
2160 | (int) data.length); | |
2161 | ||
2162 | /* Save the session ID on the first time around */ | |
2163 | if (session_id2_len == 0) { | |
2164 | session_id2_len = data.length; | |
2165 | session_id2 = xmalloc(session_id2_len); | |
2166 | memcpy(session_id2, data.value, session_id2_len); | |
2167 | } | |
2168 | major = ssh_gssapi_sign(gsscontext, &data, &hash); | |
2169 | ||
2170 | xfree(data.value); | |
2171 | ||
2172 | buffer_clear(m); | |
2173 | buffer_put_int(m, major); | |
2174 | buffer_put_string(m, hash.value, hash.length); | |
2175 | ||
2176 | mm_request_send(socket, MONITOR_ANS_GSSSIGN, m); | |
2177 | ||
2178 | gss_release_buffer(&minor, &hash); | |
2179 | ||
2180 | /* Turn on getpwnam permissions */ | |
2181 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
2182 | ||
2183 | /* And credential updating, for when rekeying */ | |
2184 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1); | |
2185 | ||
2186 | return (0); | |
2187 | } | |
2188 | ||
2189 | int | |
2190 | mm_answer_gss_updatecreds(int socket, Buffer *m) { | |
2191 | ssh_gssapi_ccache store; | |
2192 | int ok; | |
2193 | ||
2194 | store.filename = buffer_get_string(m, NULL); | |
2195 | store.envvar = buffer_get_string(m, NULL); | |
2196 | store.envval = buffer_get_string(m, NULL); | |
2197 | ||
2198 | ok = ssh_gssapi_update_creds(&store); | |
2199 | ||
2200 | xfree(store.filename); | |
2201 | xfree(store.envvar); | |
2202 | xfree(store.envval); | |
2203 | ||
2204 | buffer_clear(m); | |
2205 | buffer_put_int(m, ok); | |
2206 | ||
2207 | mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m); | |
2208 | ||
2209 | return(0); | |
2210 | } | |
2211 | ||
2212 | #endif /* GSSAPI */ | |
2213 | ||
2214 | #ifdef JPAKE | |
2215 | int | |
2216 | mm_answer_jpake_step1(int sock, Buffer *m) | |
2217 | { | |
2218 | struct jpake_ctx *pctx; | |
2219 | u_char *x3_proof, *x4_proof; | |
2220 | u_int x3_proof_len, x4_proof_len; | |
2221 | ||
2222 | if (!options.zero_knowledge_password_authentication) | |
2223 | fatal("zero_knowledge_password_authentication disabled"); | |
2224 | ||
2225 | if (authctxt->jpake_ctx != NULL) | |
2226 | fatal("%s: authctxt->jpake_ctx already set (%p)", | |
2227 | __func__, authctxt->jpake_ctx); | |
2228 | authctxt->jpake_ctx = pctx = jpake_new(); | |
2229 | ||
2230 | jpake_step1(pctx->grp, | |
2231 | &pctx->server_id, &pctx->server_id_len, | |
2232 | &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, | |
2233 | &x3_proof, &x3_proof_len, | |
2234 | &x4_proof, &x4_proof_len); | |
2235 | ||
2236 | JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); | |
2237 | ||
2238 | buffer_clear(m); | |
2239 | ||
2240 | buffer_put_string(m, pctx->server_id, pctx->server_id_len); | |
2241 | buffer_put_bignum2(m, pctx->g_x3); | |
2242 | buffer_put_bignum2(m, pctx->g_x4); | |
2243 | buffer_put_string(m, x3_proof, x3_proof_len); | |
2244 | buffer_put_string(m, x4_proof, x4_proof_len); | |
2245 | ||
2246 | debug3("%s: sending step1", __func__); | |
2247 | mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); | |
2248 | ||
2249 | bzero(x3_proof, x3_proof_len); | |
2250 | bzero(x4_proof, x4_proof_len); | |
2251 | xfree(x3_proof); | |
2252 | xfree(x4_proof); | |
2253 | ||
2254 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); | |
2255 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); | |
2256 | ||
2257 | return 0; | |
2258 | } | |
2259 | ||
2260 | int | |
2261 | mm_answer_jpake_get_pwdata(int sock, Buffer *m) | |
2262 | { | |
2263 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2264 | char *hash_scheme, *salt; | |
2265 | ||
2266 | if (pctx == NULL) | |
2267 | fatal("%s: pctx == NULL", __func__); | |
2268 | ||
2269 | auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); | |
2270 | ||
2271 | buffer_clear(m); | |
2272 | /* pctx->s is sensitive, not returned to slave */ | |
2273 | buffer_put_cstring(m, hash_scheme); | |
2274 | buffer_put_cstring(m, salt); | |
2275 | ||
2276 | debug3("%s: sending pwdata", __func__); | |
2277 | mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); | |
2278 | ||
2279 | bzero(hash_scheme, strlen(hash_scheme)); | |
2280 | bzero(salt, strlen(salt)); | |
2281 | xfree(hash_scheme); | |
2282 | xfree(salt); | |
2283 | ||
2284 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); | |
2285 | ||
2286 | return 0; | |
2287 | } | |
2288 | ||
2289 | int | |
2290 | mm_answer_jpake_step2(int sock, Buffer *m) | |
2291 | { | |
2292 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2293 | u_char *x1_proof, *x2_proof, *x4_s_proof; | |
2294 | u_int x1_proof_len, x2_proof_len, x4_s_proof_len; | |
2295 | ||
2296 | if (pctx == NULL) | |
2297 | fatal("%s: pctx == NULL", __func__); | |
2298 | ||
2299 | if ((pctx->g_x1 = BN_new()) == NULL || | |
2300 | (pctx->g_x2 = BN_new()) == NULL) | |
2301 | fatal("%s: BN_new", __func__); | |
2302 | buffer_get_bignum2(m, pctx->g_x1); | |
2303 | buffer_get_bignum2(m, pctx->g_x2); | |
2304 | pctx->client_id = buffer_get_string(m, &pctx->client_id_len); | |
2305 | x1_proof = buffer_get_string(m, &x1_proof_len); | |
2306 | x2_proof = buffer_get_string(m, &x2_proof_len); | |
2307 | ||
2308 | jpake_step2(pctx->grp, pctx->s, pctx->g_x3, | |
2309 | pctx->g_x1, pctx->g_x2, pctx->x4, | |
2310 | pctx->client_id, pctx->client_id_len, | |
2311 | pctx->server_id, pctx->server_id_len, | |
2312 | x1_proof, x1_proof_len, | |
2313 | x2_proof, x2_proof_len, | |
2314 | &pctx->b, | |
2315 | &x4_s_proof, &x4_s_proof_len); | |
2316 | ||
2317 | JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); | |
2318 | ||
2319 | bzero(x1_proof, x1_proof_len); | |
2320 | bzero(x2_proof, x2_proof_len); | |
2321 | xfree(x1_proof); | |
2322 | xfree(x2_proof); | |
2323 | ||
2324 | buffer_clear(m); | |
2325 | ||
2326 | buffer_put_bignum2(m, pctx->b); | |
2327 | buffer_put_string(m, x4_s_proof, x4_s_proof_len); | |
2328 | ||
2329 | debug3("%s: sending step2", __func__); | |
2330 | mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); | |
2331 | ||
2332 | bzero(x4_s_proof, x4_s_proof_len); | |
2333 | xfree(x4_s_proof); | |
2334 | ||
2335 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); | |
2336 | ||
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | int | |
2341 | mm_answer_jpake_key_confirm(int sock, Buffer *m) | |
2342 | { | |
2343 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2344 | u_char *x2_s_proof; | |
2345 | u_int x2_s_proof_len; | |
2346 | ||
2347 | if (pctx == NULL) | |
2348 | fatal("%s: pctx == NULL", __func__); | |
2349 | ||
2350 | if ((pctx->a = BN_new()) == NULL) | |
2351 | fatal("%s: BN_new", __func__); | |
2352 | buffer_get_bignum2(m, pctx->a); | |
2353 | x2_s_proof = buffer_get_string(m, &x2_s_proof_len); | |
2354 | ||
2355 | jpake_key_confirm(pctx->grp, pctx->s, pctx->a, | |
2356 | pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, | |
2357 | pctx->server_id, pctx->server_id_len, | |
2358 | pctx->client_id, pctx->client_id_len, | |
2359 | session_id2, session_id2_len, | |
2360 | x2_s_proof, x2_s_proof_len, | |
2361 | &pctx->k, | |
2362 | &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); | |
2363 | ||
2364 | JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); | |
2365 | ||
2366 | bzero(x2_s_proof, x2_s_proof_len); | |
2367 | buffer_clear(m); | |
2368 | ||
2369 | /* pctx->k is sensitive, not sent */ | |
2370 | buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); | |
2371 | ||
2372 | debug3("%s: sending confirmation hash", __func__); | |
2373 | mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); | |
2374 | ||
2375 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); | |
2376 | ||
2377 | return 0; | |
2378 | } | |
2379 | ||
2380 | int | |
2381 | mm_answer_jpake_check_confirm(int sock, Buffer *m) | |
2382 | { | |
2383 | int authenticated = 0; | |
2384 | u_char *peer_confirm_hash; | |
2385 | u_int peer_confirm_hash_len; | |
2386 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2387 | ||
2388 | if (pctx == NULL) | |
2389 | fatal("%s: pctx == NULL", __func__); | |
2390 | ||
2391 | peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); | |
2392 | ||
2393 | authenticated = jpake_check_confirm(pctx->k, | |
2394 | pctx->client_id, pctx->client_id_len, | |
2395 | session_id2, session_id2_len, | |
2396 | peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; | |
2397 | ||
2398 | JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); | |
2399 | ||
2400 | bzero(peer_confirm_hash, peer_confirm_hash_len); | |
2401 | xfree(peer_confirm_hash); | |
2402 | ||
2403 | buffer_clear(m); | |
2404 | buffer_put_int(m, authenticated); | |
2405 | ||
2406 | debug3("%s: sending result %d", __func__, authenticated); | |
2407 | mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); | |
2408 | ||
2409 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); | |
2410 | ||
2411 | auth_method = "jpake-01@openssh.com"; | |
2412 | return authenticated; | |
2413 | } | |
2414 | ||
2415 | #endif /* JPAKE */ |