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ff7ec503 | 1 | /* $OpenBSD: monitor.c,v 1.89 2006/11/07 10:31:31 markus Exp $ */ |
700318f3 | 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" | |
700318f3 | 29 | |
9108f8d9 | 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> | |
700318f3 | 47 | |
48 | #ifdef SKEY | |
49 | #include <skey.h> | |
50 | #endif | |
51 | ||
9108f8d9 | 52 | #include <openssl/dh.h> |
53 | ||
54 | #include "xmalloc.h" | |
700318f3 | 55 | #include "ssh.h" |
9108f8d9 | 56 | #include "key.h" |
57 | #include "buffer.h" | |
58 | #include "hostfile.h" | |
700318f3 | 59 | #include "auth.h" |
9108f8d9 | 60 | #include "cipher.h" |
700318f3 | 61 | #include "kex.h" |
62 | #include "dh.h" | |
99be0775 | 63 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
64 | #undef TARGET_OS_MAC | |
700318f3 | 65 | #include "zlib.h" |
99be0775 | 66 | #define TARGET_OS_MAC 1 |
67 | #else | |
68 | #include "zlib.h" | |
69 | #endif | |
700318f3 | 70 | #include "packet.h" |
71 | #include "auth-options.h" | |
72 | #include "sshpty.h" | |
73 | #include "channels.h" | |
74 | #include "session.h" | |
75 | #include "sshlogin.h" | |
76 | #include "canohost.h" | |
77 | #include "log.h" | |
78 | #include "servconf.h" | |
79 | #include "monitor.h" | |
80 | #include "monitor_mm.h" | |
9108f8d9 | 81 | #ifdef GSSAPI |
82 | #include "ssh-gss.h" | |
83 | #endif | |
700318f3 | 84 | #include "monitor_wrap.h" |
85 | #include "monitor_fdpass.h" | |
700318f3 | 86 | #include "misc.h" |
700318f3 | 87 | #include "compat.h" |
88 | #include "ssh2.h" | |
700318f3 | 89 | |
0fff78ff | 90 | #ifdef GSSAPI |
0fff78ff | 91 | static Gssctxt *gsscontext = NULL; |
92 | #endif | |
93 | ||
700318f3 | 94 | /* Imports */ |
95 | extern ServerOptions options; | |
96 | extern u_int utmp_len; | |
97 | extern Newkeys *current_keys[]; | |
98 | extern z_stream incoming_stream; | |
99 | extern z_stream outgoing_stream; | |
100 | extern u_char session_id[]; | |
101 | extern Buffer input, output; | |
102 | extern Buffer auth_debug; | |
103 | extern int auth_debug_init; | |
c9f39d2c | 104 | extern Buffer loginmsg; |
700318f3 | 105 | |
106 | /* State exported from the child */ | |
107 | ||
108 | struct { | |
109 | z_stream incoming; | |
110 | z_stream outgoing; | |
111 | u_char *keyin; | |
112 | u_int keyinlen; | |
113 | u_char *keyout; | |
114 | u_int keyoutlen; | |
115 | u_char *ivin; | |
116 | u_int ivinlen; | |
117 | u_char *ivout; | |
118 | u_int ivoutlen; | |
f5799ae1 | 119 | u_char *ssh1key; |
120 | u_int ssh1keylen; | |
700318f3 | 121 | int ssh1cipher; |
122 | int ssh1protoflags; | |
123 | u_char *input; | |
124 | u_int ilen; | |
125 | u_char *output; | |
126 | u_int olen; | |
127 | } child_state; | |
128 | ||
0fff78ff | 129 | /* Functions on the monitor that answer unprivileged requests */ |
700318f3 | 130 | |
131 | int mm_answer_moduli(int, Buffer *); | |
132 | int mm_answer_sign(int, Buffer *); | |
133 | int mm_answer_pwnamallow(int, Buffer *); | |
134 | int mm_answer_auth2_read_banner(int, Buffer *); | |
135 | int mm_answer_authserv(int, Buffer *); | |
136 | int mm_answer_authpassword(int, Buffer *); | |
137 | int mm_answer_bsdauthquery(int, Buffer *); | |
138 | int mm_answer_bsdauthrespond(int, Buffer *); | |
139 | int mm_answer_skeyquery(int, Buffer *); | |
140 | int mm_answer_skeyrespond(int, Buffer *); | |
141 | int mm_answer_keyallowed(int, Buffer *); | |
142 | int mm_answer_keyverify(int, Buffer *); | |
143 | int mm_answer_pty(int, Buffer *); | |
144 | int mm_answer_pty_cleanup(int, Buffer *); | |
145 | int mm_answer_term(int, Buffer *); | |
146 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
147 | int mm_answer_rsa_challenge(int, Buffer *); | |
148 | int mm_answer_rsa_response(int, Buffer *); | |
149 | int mm_answer_sesskey(int, Buffer *); | |
150 | int mm_answer_sessid(int, Buffer *); | |
151 | ||
152 | #ifdef USE_PAM | |
153 | int mm_answer_pam_start(int, Buffer *); | |
0fff78ff | 154 | int mm_answer_pam_account(int, Buffer *); |
155 | int mm_answer_pam_init_ctx(int, Buffer *); | |
156 | int mm_answer_pam_query(int, Buffer *); | |
157 | int mm_answer_pam_respond(int, Buffer *); | |
158 | int mm_answer_pam_free_ctx(int, Buffer *); | |
700318f3 | 159 | #endif |
160 | ||
0fff78ff | 161 | #ifdef GSSAPI |
162 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
163 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
164 | int mm_answer_gss_userok(int, Buffer *); | |
cdd66111 | 165 | int mm_answer_gss_checkmic(int, Buffer *); |
70e5f740 | 166 | int mm_answer_gss_sign(int, Buffer *); |
41b2f314 | 167 | #endif |
168 | ||
996d5e62 | 169 | #ifdef SSH_AUDIT_EVENTS |
170 | int mm_answer_audit_event(int, Buffer *); | |
171 | int mm_answer_audit_command(int, Buffer *); | |
172 | #endif | |
173 | ||
700318f3 | 174 | static Authctxt *authctxt; |
175 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
176 | ||
177 | /* local state for key verify */ | |
178 | static u_char *key_blob = NULL; | |
179 | static u_int key_bloblen = 0; | |
180 | static int key_blobtype = MM_NOKEY; | |
41b2f314 | 181 | static char *hostbased_cuser = NULL; |
182 | static char *hostbased_chost = NULL; | |
700318f3 | 183 | static char *auth_method = "unknown"; |
0fff78ff | 184 | static u_int session_id2_len = 0; |
f5799ae1 | 185 | static u_char *session_id2 = NULL; |
0fff78ff | 186 | static pid_t monitor_child_pid; |
700318f3 | 187 | |
188 | struct mon_table { | |
189 | enum monitor_reqtype type; | |
190 | int flags; | |
191 | int (*f)(int, Buffer *); | |
192 | }; | |
193 | ||
194 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
195 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
196 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
9108f8d9 | 197 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
700318f3 | 198 | |
199 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
200 | ||
201 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
202 | ||
203 | struct mon_table mon_dispatch_proto20[] = { | |
204 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
205 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
206 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
207 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
208 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, | |
209 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
210 | #ifdef USE_PAM | |
211 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
0fff78ff | 212 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
213 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
214 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
215 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
216 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
700318f3 | 217 | #endif |
996d5e62 | 218 | #ifdef SSH_AUDIT_EVENTS |
219 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
220 | #endif | |
700318f3 | 221 | #ifdef BSD_AUTH |
222 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
9108f8d9 | 223 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
700318f3 | 224 | #endif |
225 | #ifdef SKEY | |
226 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
227 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
228 | #endif | |
229 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
230 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
0fff78ff | 231 | #ifdef GSSAPI |
232 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
233 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
234 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
cdd66111 | 235 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
70e5f740 | 236 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, |
0fff78ff | 237 | #endif |
700318f3 | 238 | {0, 0, NULL} |
239 | }; | |
240 | ||
241 | struct mon_table mon_dispatch_postauth20[] = { | |
70e5f740 | 242 | #ifdef GSSAPI |
243 | {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, | |
244 | {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, | |
245 | {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, | |
246 | #endif | |
700318f3 | 247 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, |
248 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
249 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
250 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
251 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
996d5e62 | 252 | #ifdef SSH_AUDIT_EVENTS |
253 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
254 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
255 | #endif | |
700318f3 | 256 | {0, 0, NULL} |
257 | }; | |
258 | ||
259 | struct mon_table mon_dispatch_proto15[] = { | |
260 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
261 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
262 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
263 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
9108f8d9 | 264 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
265 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
700318f3 | 266 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
267 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
700318f3 | 268 | #ifdef BSD_AUTH |
269 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
9108f8d9 | 270 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
700318f3 | 271 | #endif |
272 | #ifdef SKEY | |
273 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
274 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
275 | #endif | |
276 | #ifdef USE_PAM | |
277 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
0fff78ff | 278 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
279 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
280 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
281 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
282 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
996d5e62 | 283 | #endif |
284 | #ifdef SSH_AUDIT_EVENTS | |
285 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
700318f3 | 286 | #endif |
287 | {0, 0, NULL} | |
288 | }; | |
289 | ||
290 | struct mon_table mon_dispatch_postauth15[] = { | |
291 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
292 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
293 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
996d5e62 | 294 | #ifdef SSH_AUDIT_EVENTS |
295 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
9108f8d9 | 296 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, |
996d5e62 | 297 | #endif |
700318f3 | 298 | {0, 0, NULL} |
299 | }; | |
300 | ||
301 | struct mon_table *mon_dispatch; | |
302 | ||
303 | /* Specifies if a certain message is allowed at the moment */ | |
304 | ||
305 | static void | |
306 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
307 | { | |
308 | while (ent->f != NULL) { | |
309 | if (ent->type == type) { | |
310 | ent->flags &= ~MON_PERMIT; | |
311 | ent->flags |= permit ? MON_PERMIT : 0; | |
312 | return; | |
313 | } | |
314 | ent++; | |
315 | } | |
316 | } | |
317 | ||
318 | static void | |
319 | monitor_permit_authentications(int permit) | |
320 | { | |
321 | struct mon_table *ent = mon_dispatch; | |
322 | ||
323 | while (ent->f != NULL) { | |
324 | if (ent->flags & MON_AUTH) { | |
325 | ent->flags &= ~MON_PERMIT; | |
326 | ent->flags |= permit ? MON_PERMIT : 0; | |
327 | } | |
328 | ent++; | |
329 | } | |
330 | } | |
331 | ||
cdd66111 | 332 | void |
333 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
700318f3 | 334 | { |
335 | struct mon_table *ent; | |
336 | int authenticated = 0; | |
337 | ||
338 | debug3("preauth child monitor started"); | |
339 | ||
cdd66111 | 340 | authctxt = _authctxt; |
341 | memset(authctxt, 0, sizeof(*authctxt)); | |
342 | ||
dec6d9fe | 343 | authctxt->loginmsg = &loginmsg; |
344 | ||
700318f3 | 345 | if (compat20) { |
346 | mon_dispatch = mon_dispatch_proto20; | |
347 | ||
348 | /* Permit requests for moduli and signatures */ | |
349 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
350 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
70e5f740 | 351 | #ifdef GSSAPI |
352 | /* and for the GSSAPI key exchange */ | |
353 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
354 | #endif | |
700318f3 | 355 | } else { |
356 | mon_dispatch = mon_dispatch_proto15; | |
357 | ||
358 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
359 | } | |
360 | ||
700318f3 | 361 | /* The first few requests do not require asynchronous access */ |
362 | while (!authenticated) { | |
9108f8d9 | 363 | auth_method = "unknown"; |
ff7ec503 | 364 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); |
700318f3 | 365 | if (authenticated) { |
366 | if (!(ent->flags & MON_AUTHDECIDE)) | |
367 | fatal("%s: unexpected authentication from %d", | |
f5799ae1 | 368 | __func__, ent->type); |
700318f3 | 369 | if (authctxt->pw->pw_uid == 0 && |
370 | !auth_root_allowed(auth_method)) | |
371 | authenticated = 0; | |
372 | #ifdef USE_PAM | |
0fff78ff | 373 | /* PAM needs to perform account checks after auth */ |
cdd66111 | 374 | if (options.use_pam && authenticated) { |
0fff78ff | 375 | Buffer m; |
376 | ||
377 | buffer_init(&m); | |
cdd66111 | 378 | mm_request_receive_expect(pmonitor->m_sendfd, |
0fff78ff | 379 | MONITOR_REQ_PAM_ACCOUNT, &m); |
380 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
381 | buffer_free(&m); | |
382 | } | |
700318f3 | 383 | #endif |
384 | } | |
385 | ||
9108f8d9 | 386 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
700318f3 | 387 | auth_log(authctxt, authenticated, auth_method, |
388 | compat20 ? " ssh2" : ""); | |
389 | if (!authenticated) | |
390 | authctxt->failures++; | |
391 | } | |
392 | } | |
393 | ||
394 | if (!authctxt->valid) | |
f5799ae1 | 395 | fatal("%s: authenticated invalid user", __func__); |
9108f8d9 | 396 | if (strcmp(auth_method, "unknown") == 0) |
397 | fatal("%s: authentication method name unknown", __func__); | |
700318f3 | 398 | |
399 | debug("%s: %s has been authenticated by privileged process", | |
f5799ae1 | 400 | __func__, authctxt->user); |
700318f3 | 401 | |
402 | mm_get_keystate(pmonitor); | |
700318f3 | 403 | } |
404 | ||
0fff78ff | 405 | static void |
406 | monitor_set_child_handler(pid_t pid) | |
407 | { | |
408 | monitor_child_pid = pid; | |
409 | } | |
410 | ||
411 | static void | |
c9f39d2c | 412 | monitor_child_handler(int sig) |
0fff78ff | 413 | { |
c9f39d2c | 414 | kill(monitor_child_pid, sig); |
0fff78ff | 415 | } |
416 | ||
700318f3 | 417 | void |
418 | monitor_child_postauth(struct monitor *pmonitor) | |
419 | { | |
0fff78ff | 420 | monitor_set_child_handler(pmonitor->m_pid); |
421 | signal(SIGHUP, &monitor_child_handler); | |
422 | signal(SIGTERM, &monitor_child_handler); | |
423 | ||
700318f3 | 424 | if (compat20) { |
425 | mon_dispatch = mon_dispatch_postauth20; | |
426 | ||
427 | /* Permit requests for moduli and signatures */ | |
428 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
429 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
430 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
70e5f740 | 431 | #ifdef GSSAPI |
432 | /* and for the GSSAPI key exchange */ | |
433 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
434 | #endif | |
700318f3 | 435 | } else { |
436 | mon_dispatch = mon_dispatch_postauth15; | |
437 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
438 | } | |
439 | if (!no_pty_flag) { | |
440 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
441 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
442 | } | |
443 | ||
444 | for (;;) | |
445 | monitor_read(pmonitor, mon_dispatch, NULL); | |
446 | } | |
447 | ||
448 | void | |
449 | monitor_sync(struct monitor *pmonitor) | |
450 | { | |
f5799ae1 | 451 | if (options.compression) { |
452 | /* The member allocation is not visible, so sync it */ | |
453 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
454 | } | |
700318f3 | 455 | } |
456 | ||
457 | int | |
458 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, | |
459 | struct mon_table **pent) | |
460 | { | |
461 | Buffer m; | |
462 | int ret; | |
463 | u_char type; | |
464 | ||
465 | buffer_init(&m); | |
466 | ||
467 | mm_request_receive(pmonitor->m_sendfd, &m); | |
468 | type = buffer_get_char(&m); | |
469 | ||
f5799ae1 | 470 | debug3("%s: checking request %d", __func__, type); |
700318f3 | 471 | |
472 | while (ent->f != NULL) { | |
473 | if (ent->type == type) | |
474 | break; | |
475 | ent++; | |
476 | } | |
477 | ||
478 | if (ent->f != NULL) { | |
479 | if (!(ent->flags & MON_PERMIT)) | |
f5799ae1 | 480 | fatal("%s: unpermitted request %d", __func__, |
700318f3 | 481 | type); |
482 | ret = (*ent->f)(pmonitor->m_sendfd, &m); | |
483 | buffer_free(&m); | |
484 | ||
485 | /* The child may use this request only once, disable it */ | |
486 | if (ent->flags & MON_ONCE) { | |
f5799ae1 | 487 | debug2("%s: %d used once, disabling now", __func__, |
700318f3 | 488 | type); |
489 | ent->flags &= ~MON_PERMIT; | |
490 | } | |
491 | ||
492 | if (pent != NULL) | |
493 | *pent = ent; | |
494 | ||
495 | return ret; | |
496 | } | |
497 | ||
f5799ae1 | 498 | fatal("%s: unsupported request: %d", __func__, type); |
700318f3 | 499 | |
500 | /* NOTREACHED */ | |
501 | return (-1); | |
502 | } | |
503 | ||
504 | /* allowed key state */ | |
505 | static int | |
506 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
507 | { | |
508 | /* make sure key is allowed */ | |
509 | if (key_blob == NULL || key_bloblen != bloblen || | |
510 | memcmp(key_blob, blob, key_bloblen)) | |
511 | return (0); | |
512 | return (1); | |
513 | } | |
514 | ||
515 | static void | |
516 | monitor_reset_key_state(void) | |
517 | { | |
518 | /* reset state */ | |
519 | if (key_blob != NULL) | |
520 | xfree(key_blob); | |
521 | if (hostbased_cuser != NULL) | |
522 | xfree(hostbased_cuser); | |
523 | if (hostbased_chost != NULL) | |
524 | xfree(hostbased_chost); | |
525 | key_blob = NULL; | |
526 | key_bloblen = 0; | |
527 | key_blobtype = MM_NOKEY; | |
528 | hostbased_cuser = NULL; | |
529 | hostbased_chost = NULL; | |
530 | } | |
531 | ||
532 | int | |
c9f39d2c | 533 | mm_answer_moduli(int sock, Buffer *m) |
700318f3 | 534 | { |
535 | DH *dh; | |
536 | int min, want, max; | |
537 | ||
538 | min = buffer_get_int(m); | |
539 | want = buffer_get_int(m); | |
540 | max = buffer_get_int(m); | |
541 | ||
542 | debug3("%s: got parameters: %d %d %d", | |
f5799ae1 | 543 | __func__, min, want, max); |
700318f3 | 544 | /* We need to check here, too, in case the child got corrupted */ |
545 | if (max < min || want < min || max < want) | |
546 | fatal("%s: bad parameters: %d %d %d", | |
f5799ae1 | 547 | __func__, min, want, max); |
700318f3 | 548 | |
549 | buffer_clear(m); | |
550 | ||
551 | dh = choose_dh(min, want, max); | |
552 | if (dh == NULL) { | |
553 | buffer_put_char(m, 0); | |
554 | return (0); | |
555 | } else { | |
556 | /* Send first bignum */ | |
557 | buffer_put_char(m, 1); | |
558 | buffer_put_bignum2(m, dh->p); | |
559 | buffer_put_bignum2(m, dh->g); | |
560 | ||
561 | DH_free(dh); | |
562 | } | |
c9f39d2c | 563 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
700318f3 | 564 | return (0); |
565 | } | |
566 | ||
567 | int | |
c9f39d2c | 568 | mm_answer_sign(int sock, Buffer *m) |
700318f3 | 569 | { |
570 | Key *key; | |
571 | u_char *p; | |
572 | u_char *signature; | |
573 | u_int siglen, datlen; | |
574 | int keyid; | |
575 | ||
f5799ae1 | 576 | debug3("%s", __func__); |
700318f3 | 577 | |
578 | keyid = buffer_get_int(m); | |
579 | p = buffer_get_string(m, &datlen); | |
580 | ||
9108f8d9 | 581 | /* |
582 | * Supported KEX types will only return SHA1 (20 byte) or | |
583 | * SHA256 (32 byte) hashes | |
584 | */ | |
585 | if (datlen != 20 && datlen != 32) | |
41b2f314 | 586 | fatal("%s: data length incorrect: %u", __func__, datlen); |
f5799ae1 | 587 | |
588 | /* save session id, it will be passed on the first call */ | |
589 | if (session_id2_len == 0) { | |
590 | session_id2_len = datlen; | |
591 | session_id2 = xmalloc(session_id2_len); | |
592 | memcpy(session_id2, p, session_id2_len); | |
593 | } | |
700318f3 | 594 | |
595 | if ((key = get_hostkey_by_index(keyid)) == NULL) | |
f5799ae1 | 596 | fatal("%s: no hostkey from index %d", __func__, keyid); |
700318f3 | 597 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
f5799ae1 | 598 | fatal("%s: key_sign failed", __func__); |
700318f3 | 599 | |
41b2f314 | 600 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
700318f3 | 601 | |
602 | buffer_clear(m); | |
603 | buffer_put_string(m, signature, siglen); | |
604 | ||
605 | xfree(p); | |
606 | xfree(signature); | |
607 | ||
c9f39d2c | 608 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
700318f3 | 609 | |
610 | /* Turn on permissions for getpwnam */ | |
611 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
612 | ||
613 | return (0); | |
614 | } | |
615 | ||
616 | /* Retrieves the password entry and also checks if the user is permitted */ | |
617 | ||
618 | int | |
c9f39d2c | 619 | mm_answer_pwnamallow(int sock, Buffer *m) |
700318f3 | 620 | { |
c9f39d2c | 621 | char *username; |
700318f3 | 622 | struct passwd *pwent; |
623 | int allowed = 0; | |
624 | ||
f5799ae1 | 625 | debug3("%s", __func__); |
700318f3 | 626 | |
627 | if (authctxt->attempt++ != 0) | |
f5799ae1 | 628 | fatal("%s: multiple attempts for getpwnam", __func__); |
700318f3 | 629 | |
c9f39d2c | 630 | username = buffer_get_string(m, NULL); |
700318f3 | 631 | |
c9f39d2c | 632 | pwent = getpwnamallow(username); |
700318f3 | 633 | |
c9f39d2c | 634 | authctxt->user = xstrdup(username); |
635 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
636 | xfree(username); | |
700318f3 | 637 | |
638 | buffer_clear(m); | |
639 | ||
640 | if (pwent == NULL) { | |
641 | buffer_put_char(m, 0); | |
cdd66111 | 642 | authctxt->pw = fakepw(); |
700318f3 | 643 | goto out; |
644 | } | |
645 | ||
646 | allowed = 1; | |
647 | authctxt->pw = pwent; | |
648 | authctxt->valid = 1; | |
649 | ||
650 | buffer_put_char(m, 1); | |
651 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
652 | buffer_put_cstring(m, pwent->pw_name); | |
653 | buffer_put_cstring(m, "*"); | |
654 | buffer_put_cstring(m, pwent->pw_gecos); | |
655 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
656 | buffer_put_cstring(m, pwent->pw_class); | |
657 | #endif | |
658 | buffer_put_cstring(m, pwent->pw_dir); | |
659 | buffer_put_cstring(m, pwent->pw_shell); | |
660 | ||
661 | out: | |
f5799ae1 | 662 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
c9f39d2c | 663 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
700318f3 | 664 | |
665 | /* For SSHv1 allow authentication now */ | |
666 | if (!compat20) | |
667 | monitor_permit_authentications(1); | |
668 | else { | |
669 | /* Allow service/style information on the auth context */ | |
670 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
671 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); | |
672 | } | |
673 | ||
674 | #ifdef USE_PAM | |
0fff78ff | 675 | if (options.use_pam) |
676 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
700318f3 | 677 | #endif |
678 | ||
679 | return (0); | |
680 | } | |
681 | ||
c9f39d2c | 682 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
700318f3 | 683 | { |
684 | char *banner; | |
685 | ||
686 | buffer_clear(m); | |
687 | banner = auth2_read_banner(); | |
688 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
c9f39d2c | 689 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
700318f3 | 690 | |
691 | if (banner != NULL) | |
41b2f314 | 692 | xfree(banner); |
700318f3 | 693 | |
694 | return (0); | |
695 | } | |
696 | ||
697 | int | |
c9f39d2c | 698 | mm_answer_authserv(int sock, Buffer *m) |
700318f3 | 699 | { |
700 | monitor_permit_authentications(1); | |
701 | ||
702 | authctxt->service = buffer_get_string(m, NULL); | |
703 | authctxt->style = buffer_get_string(m, NULL); | |
704 | debug3("%s: service=%s, style=%s", | |
f5799ae1 | 705 | __func__, authctxt->service, authctxt->style); |
700318f3 | 706 | |
707 | if (strlen(authctxt->style) == 0) { | |
708 | xfree(authctxt->style); | |
709 | authctxt->style = NULL; | |
710 | } | |
711 | ||
712 | return (0); | |
713 | } | |
714 | ||
715 | int | |
c9f39d2c | 716 | mm_answer_authpassword(int sock, Buffer *m) |
700318f3 | 717 | { |
718 | static int call_count; | |
719 | char *passwd; | |
41b2f314 | 720 | int authenticated; |
721 | u_int plen; | |
700318f3 | 722 | |
723 | passwd = buffer_get_string(m, &plen); | |
724 | /* Only authenticate if the context is valid */ | |
f5799ae1 | 725 | authenticated = options.password_authentication && |
0fff78ff | 726 | auth_password(authctxt, passwd); |
700318f3 | 727 | memset(passwd, 0, strlen(passwd)); |
728 | xfree(passwd); | |
729 | ||
730 | buffer_clear(m); | |
731 | buffer_put_int(m, authenticated); | |
732 | ||
f5799ae1 | 733 | debug3("%s: sending result %d", __func__, authenticated); |
c9f39d2c | 734 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
700318f3 | 735 | |
736 | call_count++; | |
737 | if (plen == 0 && call_count == 1) | |
738 | auth_method = "none"; | |
739 | else | |
740 | auth_method = "password"; | |
741 | ||
742 | /* Causes monitor loop to terminate if authenticated */ | |
743 | return (authenticated); | |
744 | } | |
745 | ||
746 | #ifdef BSD_AUTH | |
747 | int | |
c9f39d2c | 748 | mm_answer_bsdauthquery(int sock, Buffer *m) |
700318f3 | 749 | { |
750 | char *name, *infotxt; | |
751 | u_int numprompts; | |
752 | u_int *echo_on; | |
753 | char **prompts; | |
6a9b3198 | 754 | u_int success; |
700318f3 | 755 | |
6a9b3198 | 756 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
757 | &prompts, &echo_on) < 0 ? 0 : 1; | |
700318f3 | 758 | |
759 | buffer_clear(m); | |
6a9b3198 | 760 | buffer_put_int(m, success); |
761 | if (success) | |
700318f3 | 762 | buffer_put_cstring(m, prompts[0]); |
763 | ||
6a9b3198 | 764 | debug3("%s: sending challenge success: %u", __func__, success); |
c9f39d2c | 765 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
700318f3 | 766 | |
6a9b3198 | 767 | if (success) { |
700318f3 | 768 | xfree(name); |
769 | xfree(infotxt); | |
770 | xfree(prompts); | |
771 | xfree(echo_on); | |
772 | } | |
773 | ||
774 | return (0); | |
775 | } | |
776 | ||
777 | int | |
c9f39d2c | 778 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
700318f3 | 779 | { |
780 | char *response; | |
781 | int authok; | |
782 | ||
783 | if (authctxt->as == 0) | |
f5799ae1 | 784 | fatal("%s: no bsd auth session", __func__); |
700318f3 | 785 | |
786 | response = buffer_get_string(m, NULL); | |
f5799ae1 | 787 | authok = options.challenge_response_authentication && |
788 | auth_userresponse(authctxt->as, response, 0); | |
700318f3 | 789 | authctxt->as = NULL; |
f5799ae1 | 790 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
700318f3 | 791 | xfree(response); |
792 | ||
793 | buffer_clear(m); | |
794 | buffer_put_int(m, authok); | |
795 | ||
f5799ae1 | 796 | debug3("%s: sending authenticated: %d", __func__, authok); |
c9f39d2c | 797 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
700318f3 | 798 | |
799 | auth_method = "bsdauth"; | |
800 | ||
801 | return (authok != 0); | |
802 | } | |
803 | #endif | |
804 | ||
805 | #ifdef SKEY | |
806 | int | |
c9f39d2c | 807 | mm_answer_skeyquery(int sock, Buffer *m) |
700318f3 | 808 | { |
809 | struct skey skey; | |
810 | char challenge[1024]; | |
6a9b3198 | 811 | u_int success; |
700318f3 | 812 | |
99be0775 | 813 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
814 | sizeof(challenge)) < 0 ? 0 : 1; | |
700318f3 | 815 | |
816 | buffer_clear(m); | |
6a9b3198 | 817 | buffer_put_int(m, success); |
818 | if (success) | |
700318f3 | 819 | buffer_put_cstring(m, challenge); |
820 | ||
6a9b3198 | 821 | debug3("%s: sending challenge success: %u", __func__, success); |
c9f39d2c | 822 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
700318f3 | 823 | |
824 | return (0); | |
825 | } | |
826 | ||
827 | int | |
c9f39d2c | 828 | mm_answer_skeyrespond(int sock, Buffer *m) |
700318f3 | 829 | { |
830 | char *response; | |
831 | int authok; | |
832 | ||
833 | response = buffer_get_string(m, NULL); | |
834 | ||
f5799ae1 | 835 | authok = (options.challenge_response_authentication && |
836 | authctxt->valid && | |
700318f3 | 837 | skey_haskey(authctxt->pw->pw_name) == 0 && |
838 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
839 | ||
840 | xfree(response); | |
841 | ||
842 | buffer_clear(m); | |
843 | buffer_put_int(m, authok); | |
844 | ||
f5799ae1 | 845 | debug3("%s: sending authenticated: %d", __func__, authok); |
c9f39d2c | 846 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
700318f3 | 847 | |
848 | auth_method = "skey"; | |
849 | ||
850 | return (authok != 0); | |
851 | } | |
852 | #endif | |
853 | ||
854 | #ifdef USE_PAM | |
855 | int | |
c9f39d2c | 856 | mm_answer_pam_start(int sock, Buffer *m) |
700318f3 | 857 | { |
0fff78ff | 858 | if (!options.use_pam) |
859 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
860 | ||
99be0775 | 861 | start_pam(authctxt); |
700318f3 | 862 | |
0fff78ff | 863 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
864 | ||
700318f3 | 865 | return (0); |
866 | } | |
0fff78ff | 867 | |
868 | int | |
c9f39d2c | 869 | mm_answer_pam_account(int sock, Buffer *m) |
0fff78ff | 870 | { |
871 | u_int ret; | |
cdd66111 | 872 | |
0fff78ff | 873 | if (!options.use_pam) |
874 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
875 | ||
876 | ret = do_pam_account(); | |
877 | ||
878 | buffer_put_int(m, ret); | |
2c06c99b | 879 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
0fff78ff | 880 | |
c9f39d2c | 881 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
0fff78ff | 882 | |
883 | return (ret); | |
884 | } | |
885 | ||
886 | static void *sshpam_ctxt, *sshpam_authok; | |
887 | extern KbdintDevice sshpam_device; | |
888 | ||
889 | int | |
c9f39d2c | 890 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
0fff78ff | 891 | { |
892 | ||
893 | debug3("%s", __func__); | |
894 | authctxt->user = buffer_get_string(m, NULL); | |
895 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
896 | sshpam_authok = NULL; | |
897 | buffer_clear(m); | |
898 | if (sshpam_ctxt != NULL) { | |
899 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
900 | buffer_put_int(m, 1); | |
901 | } else { | |
902 | buffer_put_int(m, 0); | |
903 | } | |
c9f39d2c | 904 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
0fff78ff | 905 | return (0); |
906 | } | |
907 | ||
908 | int | |
c9f39d2c | 909 | mm_answer_pam_query(int sock, Buffer *m) |
0fff78ff | 910 | { |
911 | char *name, *info, **prompts; | |
665a873d | 912 | u_int i, num, *echo_on; |
913 | int ret; | |
0fff78ff | 914 | |
915 | debug3("%s", __func__); | |
916 | sshpam_authok = NULL; | |
917 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
918 | if (ret == 0 && num == 0) | |
919 | sshpam_authok = sshpam_ctxt; | |
920 | if (num > 1 || name == NULL || info == NULL) | |
921 | ret = -1; | |
922 | buffer_clear(m); | |
923 | buffer_put_int(m, ret); | |
924 | buffer_put_cstring(m, name); | |
925 | xfree(name); | |
926 | buffer_put_cstring(m, info); | |
927 | xfree(info); | |
928 | buffer_put_int(m, num); | |
929 | for (i = 0; i < num; ++i) { | |
930 | buffer_put_cstring(m, prompts[i]); | |
931 | xfree(prompts[i]); | |
932 | buffer_put_int(m, echo_on[i]); | |
933 | } | |
934 | if (prompts != NULL) | |
935 | xfree(prompts); | |
936 | if (echo_on != NULL) | |
937 | xfree(echo_on); | |
9108f8d9 | 938 | auth_method = "keyboard-interactive/pam"; |
c9f39d2c | 939 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
0fff78ff | 940 | return (0); |
941 | } | |
942 | ||
943 | int | |
c9f39d2c | 944 | mm_answer_pam_respond(int sock, Buffer *m) |
0fff78ff | 945 | { |
946 | char **resp; | |
665a873d | 947 | u_int i, num; |
948 | int ret; | |
0fff78ff | 949 | |
950 | debug3("%s", __func__); | |
951 | sshpam_authok = NULL; | |
952 | num = buffer_get_int(m); | |
953 | if (num > 0) { | |
9108f8d9 | 954 | resp = xcalloc(num, sizeof(char *)); |
0fff78ff | 955 | for (i = 0; i < num; ++i) |
956 | resp[i] = buffer_get_string(m, NULL); | |
957 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
958 | for (i = 0; i < num; ++i) | |
959 | xfree(resp[i]); | |
960 | xfree(resp); | |
961 | } else { | |
962 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
963 | } | |
964 | buffer_clear(m); | |
965 | buffer_put_int(m, ret); | |
c9f39d2c | 966 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
0fff78ff | 967 | auth_method = "keyboard-interactive/pam"; |
968 | if (ret == 0) | |
969 | sshpam_authok = sshpam_ctxt; | |
970 | return (0); | |
971 | } | |
972 | ||
973 | int | |
c9f39d2c | 974 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
0fff78ff | 975 | { |
976 | ||
977 | debug3("%s", __func__); | |
978 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
979 | buffer_clear(m); | |
c9f39d2c | 980 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
9108f8d9 | 981 | auth_method = "keyboard-interactive/pam"; |
0fff78ff | 982 | return (sshpam_authok == sshpam_ctxt); |
983 | } | |
700318f3 | 984 | #endif |
985 | ||
986 | static void | |
987 | mm_append_debug(Buffer *m) | |
988 | { | |
989 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
f5799ae1 | 990 | debug3("%s: Appending debug messages for child", __func__); |
700318f3 | 991 | buffer_append(m, buffer_ptr(&auth_debug), |
992 | buffer_len(&auth_debug)); | |
993 | buffer_clear(&auth_debug); | |
994 | } | |
995 | } | |
996 | ||
997 | int | |
c9f39d2c | 998 | mm_answer_keyallowed(int sock, Buffer *m) |
700318f3 | 999 | { |
1000 | Key *key; | |
41b2f314 | 1001 | char *cuser, *chost; |
1002 | u_char *blob; | |
700318f3 | 1003 | u_int bloblen; |
1004 | enum mm_keytype type = 0; | |
1005 | int allowed = 0; | |
1006 | ||
f5799ae1 | 1007 | debug3("%s entering", __func__); |
700318f3 | 1008 | |
1009 | type = buffer_get_int(m); | |
1010 | cuser = buffer_get_string(m, NULL); | |
1011 | chost = buffer_get_string(m, NULL); | |
1012 | blob = buffer_get_string(m, &bloblen); | |
1013 | ||
1014 | key = key_from_blob(blob, bloblen); | |
1015 | ||
1016 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1017 | (!compat20 && type != MM_RSAHOSTKEY)) | |
f5799ae1 | 1018 | fatal("%s: key type and protocol mismatch", __func__); |
700318f3 | 1019 | |
f5799ae1 | 1020 | debug3("%s: key_from_blob: %p", __func__, key); |
700318f3 | 1021 | |
cdd66111 | 1022 | if (key != NULL && authctxt->valid) { |
dec6d9fe | 1023 | switch (type) { |
700318f3 | 1024 | case MM_USERKEY: |
f5799ae1 | 1025 | allowed = options.pubkey_authentication && |
1026 | user_key_allowed(authctxt->pw, key); | |
9108f8d9 | 1027 | auth_method = "publickey"; |
700318f3 | 1028 | break; |
1029 | case MM_HOSTKEY: | |
f5799ae1 | 1030 | allowed = options.hostbased_authentication && |
1031 | hostbased_key_allowed(authctxt->pw, | |
700318f3 | 1032 | cuser, chost, key); |
9108f8d9 | 1033 | auth_method = "hostbased"; |
700318f3 | 1034 | break; |
1035 | case MM_RSAHOSTKEY: | |
1036 | key->type = KEY_RSA1; /* XXX */ | |
f5799ae1 | 1037 | allowed = options.rhosts_rsa_authentication && |
1038 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
700318f3 | 1039 | cuser, chost, key); |
9108f8d9 | 1040 | auth_method = "rsa"; |
700318f3 | 1041 | break; |
1042 | default: | |
f5799ae1 | 1043 | fatal("%s: unknown key type %d", __func__, type); |
700318f3 | 1044 | break; |
1045 | } | |
700318f3 | 1046 | } |
6a9b3198 | 1047 | if (key != NULL) |
1048 | key_free(key); | |
700318f3 | 1049 | |
1050 | /* clear temporarily storage (used by verify) */ | |
1051 | monitor_reset_key_state(); | |
1052 | ||
1053 | if (allowed) { | |
1054 | /* Save temporarily for comparison in verify */ | |
1055 | key_blob = blob; | |
1056 | key_bloblen = bloblen; | |
1057 | key_blobtype = type; | |
1058 | hostbased_cuser = cuser; | |
1059 | hostbased_chost = chost; | |
9108f8d9 | 1060 | } else { |
1061 | /* Log failed attempt */ | |
1062 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
1063 | xfree(blob); | |
1064 | xfree(cuser); | |
1065 | xfree(chost); | |
700318f3 | 1066 | } |
1067 | ||
1068 | debug3("%s: key %p is %s", | |
f5799ae1 | 1069 | __func__, key, allowed ? "allowed" : "disallowed"); |
700318f3 | 1070 | |
1071 | buffer_clear(m); | |
1072 | buffer_put_int(m, allowed); | |
6a9b3198 | 1073 | buffer_put_int(m, forced_command != NULL); |
700318f3 | 1074 | |
1075 | mm_append_debug(m); | |
1076 | ||
c9f39d2c | 1077 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
700318f3 | 1078 | |
1079 | if (type == MM_RSAHOSTKEY) | |
1080 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1081 | ||
1082 | return (0); | |
1083 | } | |
1084 | ||
1085 | static int | |
1086 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1087 | { | |
1088 | Buffer b; | |
41b2f314 | 1089 | char *p; |
700318f3 | 1090 | u_int len; |
1091 | int fail = 0; | |
700318f3 | 1092 | |
1093 | buffer_init(&b); | |
1094 | buffer_append(&b, data, datalen); | |
1095 | ||
1096 | if (datafellows & SSH_OLD_SESSIONID) { | |
f5799ae1 | 1097 | p = buffer_ptr(&b); |
1098 | len = buffer_len(&b); | |
1099 | if ((session_id2 == NULL) || | |
1100 | (len < session_id2_len) || | |
1101 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1102 | fail++; | |
700318f3 | 1103 | buffer_consume(&b, session_id2_len); |
1104 | } else { | |
f5799ae1 | 1105 | p = buffer_get_string(&b, &len); |
1106 | if ((session_id2 == NULL) || | |
1107 | (len != session_id2_len) || | |
1108 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
700318f3 | 1109 | fail++; |
f5799ae1 | 1110 | xfree(p); |
700318f3 | 1111 | } |
1112 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1113 | fail++; | |
1114 | p = buffer_get_string(&b, NULL); | |
1115 | if (strcmp(authctxt->user, p) != 0) { | |
0fff78ff | 1116 | logit("wrong user name passed to monitor: expected %s != %.100s", |
700318f3 | 1117 | authctxt->user, p); |
1118 | fail++; | |
1119 | } | |
1120 | xfree(p); | |
1121 | buffer_skip_string(&b); | |
1122 | if (datafellows & SSH_BUG_PKAUTH) { | |
1123 | if (!buffer_get_char(&b)) | |
1124 | fail++; | |
1125 | } else { | |
1126 | p = buffer_get_string(&b, NULL); | |
1127 | if (strcmp("publickey", p) != 0) | |
1128 | fail++; | |
1129 | xfree(p); | |
1130 | if (!buffer_get_char(&b)) | |
1131 | fail++; | |
1132 | buffer_skip_string(&b); | |
1133 | } | |
1134 | buffer_skip_string(&b); | |
1135 | if (buffer_len(&b) != 0) | |
1136 | fail++; | |
1137 | buffer_free(&b); | |
1138 | return (fail == 0); | |
1139 | } | |
1140 | ||
1141 | static int | |
41b2f314 | 1142 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1143 | char *chost) | |
700318f3 | 1144 | { |
1145 | Buffer b; | |
41b2f314 | 1146 | char *p; |
700318f3 | 1147 | u_int len; |
1148 | int fail = 0; | |
700318f3 | 1149 | |
1150 | buffer_init(&b); | |
1151 | buffer_append(&b, data, datalen); | |
1152 | ||
f5799ae1 | 1153 | p = buffer_get_string(&b, &len); |
1154 | if ((session_id2 == NULL) || | |
1155 | (len != session_id2_len) || | |
1156 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
700318f3 | 1157 | fail++; |
f5799ae1 | 1158 | xfree(p); |
1159 | ||
700318f3 | 1160 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1161 | fail++; | |
1162 | p = buffer_get_string(&b, NULL); | |
1163 | if (strcmp(authctxt->user, p) != 0) { | |
0fff78ff | 1164 | logit("wrong user name passed to monitor: expected %s != %.100s", |
700318f3 | 1165 | authctxt->user, p); |
1166 | fail++; | |
1167 | } | |
1168 | xfree(p); | |
1169 | buffer_skip_string(&b); /* service */ | |
1170 | p = buffer_get_string(&b, NULL); | |
1171 | if (strcmp(p, "hostbased") != 0) | |
1172 | fail++; | |
1173 | xfree(p); | |
1174 | buffer_skip_string(&b); /* pkalg */ | |
1175 | buffer_skip_string(&b); /* pkblob */ | |
1176 | ||
1177 | /* verify client host, strip trailing dot if necessary */ | |
1178 | p = buffer_get_string(&b, NULL); | |
1179 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1180 | p[len - 1] = '\0'; | |
1181 | if (strcmp(p, chost) != 0) | |
1182 | fail++; | |
1183 | xfree(p); | |
1184 | ||
1185 | /* verify client user */ | |
1186 | p = buffer_get_string(&b, NULL); | |
1187 | if (strcmp(p, cuser) != 0) | |
1188 | fail++; | |
1189 | xfree(p); | |
1190 | ||
1191 | if (buffer_len(&b) != 0) | |
1192 | fail++; | |
1193 | buffer_free(&b); | |
1194 | return (fail == 0); | |
1195 | } | |
1196 | ||
1197 | int | |
c9f39d2c | 1198 | mm_answer_keyverify(int sock, Buffer *m) |
700318f3 | 1199 | { |
1200 | Key *key; | |
1201 | u_char *signature, *data, *blob; | |
1202 | u_int signaturelen, datalen, bloblen; | |
1203 | int verified = 0; | |
1204 | int valid_data = 0; | |
1205 | ||
1206 | blob = buffer_get_string(m, &bloblen); | |
1207 | signature = buffer_get_string(m, &signaturelen); | |
1208 | data = buffer_get_string(m, &datalen); | |
1209 | ||
1210 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
1211 | !monitor_allowed_key(blob, bloblen)) | |
f5799ae1 | 1212 | fatal("%s: bad key, not previously allowed", __func__); |
700318f3 | 1213 | |
1214 | key = key_from_blob(blob, bloblen); | |
1215 | if (key == NULL) | |
f5799ae1 | 1216 | fatal("%s: bad public key blob", __func__); |
700318f3 | 1217 | |
1218 | switch (key_blobtype) { | |
1219 | case MM_USERKEY: | |
1220 | valid_data = monitor_valid_userblob(data, datalen); | |
1221 | break; | |
1222 | case MM_HOSTKEY: | |
1223 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1224 | hostbased_cuser, hostbased_chost); | |
1225 | break; | |
1226 | default: | |
1227 | valid_data = 0; | |
1228 | break; | |
1229 | } | |
1230 | if (!valid_data) | |
f5799ae1 | 1231 | fatal("%s: bad signature data blob", __func__); |
700318f3 | 1232 | |
1233 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1234 | debug3("%s: key %p signature %s", | |
ff7ec503 | 1235 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
700318f3 | 1236 | |
1237 | key_free(key); | |
1238 | xfree(blob); | |
1239 | xfree(signature); | |
1240 | xfree(data); | |
1241 | ||
680cee3b | 1242 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1243 | ||
700318f3 | 1244 | monitor_reset_key_state(); |
1245 | ||
1246 | buffer_clear(m); | |
1247 | buffer_put_int(m, verified); | |
c9f39d2c | 1248 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
700318f3 | 1249 | |
ff7ec503 | 1250 | return (verified == 1); |
700318f3 | 1251 | } |
1252 | ||
1253 | static void | |
1254 | mm_record_login(Session *s, struct passwd *pw) | |
1255 | { | |
1256 | socklen_t fromlen; | |
1257 | struct sockaddr_storage from; | |
1258 | ||
1259 | /* | |
1260 | * Get IP address of client. If the connection is not a socket, let | |
1261 | * the address be 0.0.0.0. | |
1262 | */ | |
1263 | memset(&from, 0, sizeof(from)); | |
41b2f314 | 1264 | fromlen = sizeof(from); |
700318f3 | 1265 | if (packet_connection_is_on_socket()) { |
700318f3 | 1266 | if (getpeername(packet_get_connection_in(), |
9108f8d9 | 1267 | (struct sockaddr *)&from, &fromlen) < 0) { |
700318f3 | 1268 | debug("getpeername: %.100s", strerror(errno)); |
cdd66111 | 1269 | cleanup_exit(255); |
700318f3 | 1270 | } |
1271 | } | |
1272 | /* Record that there was a login on that tty from the remote host. */ | |
1273 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
0fff78ff | 1274 | get_remote_name_or_ip(utmp_len, options.use_dns), |
41b2f314 | 1275 | (struct sockaddr *)&from, fromlen); |
700318f3 | 1276 | } |
1277 | ||
1278 | static void | |
1279 | mm_session_close(Session *s) | |
1280 | { | |
0fff78ff | 1281 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
700318f3 | 1282 | if (s->ttyfd != -1) { |
9108f8d9 | 1283 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
700318f3 | 1284 | session_pty_cleanup2(s); |
1285 | } | |
1286 | s->used = 0; | |
1287 | } | |
1288 | ||
1289 | int | |
c9f39d2c | 1290 | mm_answer_pty(int sock, Buffer *m) |
700318f3 | 1291 | { |
1292 | extern struct monitor *pmonitor; | |
1293 | Session *s; | |
1294 | int res, fd0; | |
1295 | ||
f5799ae1 | 1296 | debug3("%s entering", __func__); |
700318f3 | 1297 | |
1298 | buffer_clear(m); | |
1299 | s = session_new(); | |
1300 | if (s == NULL) | |
1301 | goto error; | |
1302 | s->authctxt = authctxt; | |
1303 | s->pw = authctxt->pw; | |
1304 | s->pid = pmonitor->m_pid; | |
1305 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); | |
1306 | if (res == 0) | |
1307 | goto error; | |
700318f3 | 1308 | pty_setowner(authctxt->pw, s->tty); |
1309 | ||
1310 | buffer_put_int(m, 1); | |
1311 | buffer_put_cstring(m, s->tty); | |
700318f3 | 1312 | |
1313 | /* We need to trick ttyslot */ | |
1314 | if (dup2(s->ttyfd, 0) == -1) | |
f5799ae1 | 1315 | fatal("%s: dup2", __func__); |
700318f3 | 1316 | |
1317 | mm_record_login(s, authctxt->pw); | |
1318 | ||
1319 | /* Now we can close the file descriptor again */ | |
1320 | close(0); | |
1321 | ||
c9f39d2c | 1322 | /* send messages generated by record_login */ |
1323 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1324 | buffer_clear(&loginmsg); | |
1325 | ||
1326 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1327 | ||
1328 | mm_send_fd(sock, s->ptyfd); | |
1329 | mm_send_fd(sock, s->ttyfd); | |
1330 | ||
700318f3 | 1331 | /* make sure nothing uses fd 0 */ |
1332 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
f5799ae1 | 1333 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
700318f3 | 1334 | if (fd0 != 0) |
f5799ae1 | 1335 | error("%s: fd0 %d != 0", __func__, fd0); |
700318f3 | 1336 | |
1337 | /* slave is not needed */ | |
1338 | close(s->ttyfd); | |
1339 | s->ttyfd = s->ptyfd; | |
1340 | /* no need to dup() because nobody closes ptyfd */ | |
1341 | s->ptymaster = s->ptyfd; | |
1342 | ||
9108f8d9 | 1343 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
700318f3 | 1344 | |
1345 | return (0); | |
1346 | ||
1347 | error: | |
1348 | if (s != NULL) | |
1349 | mm_session_close(s); | |
1350 | buffer_put_int(m, 0); | |
c9f39d2c | 1351 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
700318f3 | 1352 | return (0); |
1353 | } | |
1354 | ||
1355 | int | |
c9f39d2c | 1356 | mm_answer_pty_cleanup(int sock, Buffer *m) |
700318f3 | 1357 | { |
1358 | Session *s; | |
1359 | char *tty; | |
1360 | ||
f5799ae1 | 1361 | debug3("%s entering", __func__); |
700318f3 | 1362 | |
1363 | tty = buffer_get_string(m, NULL); | |
1364 | if ((s = session_by_tty(tty)) != NULL) | |
1365 | mm_session_close(s); | |
1366 | buffer_clear(m); | |
1367 | xfree(tty); | |
1368 | return (0); | |
1369 | } | |
1370 | ||
1371 | int | |
c9f39d2c | 1372 | mm_answer_sesskey(int sock, Buffer *m) |
700318f3 | 1373 | { |
1374 | BIGNUM *p; | |
1375 | int rsafail; | |
1376 | ||
1377 | /* Turn off permissions */ | |
996d5e62 | 1378 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
700318f3 | 1379 | |
1380 | if ((p = BN_new()) == NULL) | |
f5799ae1 | 1381 | fatal("%s: BN_new", __func__); |
700318f3 | 1382 | |
1383 | buffer_get_bignum2(m, p); | |
1384 | ||
1385 | rsafail = ssh1_session_key(p); | |
1386 | ||
1387 | buffer_clear(m); | |
1388 | buffer_put_int(m, rsafail); | |
1389 | buffer_put_bignum2(m, p); | |
1390 | ||
1391 | BN_clear_free(p); | |
1392 | ||
c9f39d2c | 1393 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
700318f3 | 1394 | |
1395 | /* Turn on permissions for sessid passing */ | |
1396 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1397 | ||
1398 | return (0); | |
1399 | } | |
1400 | ||
1401 | int | |
c9f39d2c | 1402 | mm_answer_sessid(int sock, Buffer *m) |
700318f3 | 1403 | { |
1404 | int i; | |
1405 | ||
f5799ae1 | 1406 | debug3("%s entering", __func__); |
700318f3 | 1407 | |
1408 | if (buffer_len(m) != 16) | |
f5799ae1 | 1409 | fatal("%s: bad ssh1 session id", __func__); |
700318f3 | 1410 | for (i = 0; i < 16; i++) |
1411 | session_id[i] = buffer_get_char(m); | |
1412 | ||
1413 | /* Turn on permissions for getpwnam */ | |
1414 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1415 | ||
1416 | return (0); | |
1417 | } | |
1418 | ||
1419 | int | |
c9f39d2c | 1420 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
700318f3 | 1421 | { |
1422 | BIGNUM *client_n; | |
1423 | Key *key = NULL; | |
1424 | u_char *blob = NULL; | |
1425 | u_int blen = 0; | |
1426 | int allowed = 0; | |
1427 | ||
f5799ae1 | 1428 | debug3("%s entering", __func__); |
700318f3 | 1429 | |
9108f8d9 | 1430 | auth_method = "rsa"; |
f5799ae1 | 1431 | if (options.rsa_authentication && authctxt->valid) { |
700318f3 | 1432 | if ((client_n = BN_new()) == NULL) |
f5799ae1 | 1433 | fatal("%s: BN_new", __func__); |
700318f3 | 1434 | buffer_get_bignum2(m, client_n); |
1435 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1436 | BN_clear_free(client_n); | |
1437 | } | |
1438 | buffer_clear(m); | |
1439 | buffer_put_int(m, allowed); | |
6a9b3198 | 1440 | buffer_put_int(m, forced_command != NULL); |
700318f3 | 1441 | |
1442 | /* clear temporarily storage (used by generate challenge) */ | |
1443 | monitor_reset_key_state(); | |
1444 | ||
1445 | if (allowed && key != NULL) { | |
1446 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1447 | if (key_to_blob(key, &blob, &blen) == 0) | |
f5799ae1 | 1448 | fatal("%s: key_to_blob failed", __func__); |
700318f3 | 1449 | buffer_put_string(m, blob, blen); |
1450 | ||
1451 | /* Save temporarily for comparison in verify */ | |
1452 | key_blob = blob; | |
1453 | key_bloblen = blen; | |
1454 | key_blobtype = MM_RSAUSERKEY; | |
700318f3 | 1455 | } |
6a9b3198 | 1456 | if (key != NULL) |
1457 | key_free(key); | |
700318f3 | 1458 | |
1459 | mm_append_debug(m); | |
1460 | ||
c9f39d2c | 1461 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
700318f3 | 1462 | |
1463 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1464 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1465 | return (0); | |
1466 | } | |
1467 | ||
1468 | int | |
c9f39d2c | 1469 | mm_answer_rsa_challenge(int sock, Buffer *m) |
700318f3 | 1470 | { |
1471 | Key *key = NULL; | |
1472 | u_char *blob; | |
1473 | u_int blen; | |
1474 | ||
f5799ae1 | 1475 | debug3("%s entering", __func__); |
700318f3 | 1476 | |
1477 | if (!authctxt->valid) | |
f5799ae1 | 1478 | fatal("%s: authctxt not valid", __func__); |
700318f3 | 1479 | blob = buffer_get_string(m, &blen); |
1480 | if (!monitor_allowed_key(blob, blen)) | |
f5799ae1 | 1481 | fatal("%s: bad key, not previously allowed", __func__); |
700318f3 | 1482 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
f5799ae1 | 1483 | fatal("%s: key type mismatch", __func__); |
700318f3 | 1484 | if ((key = key_from_blob(blob, blen)) == NULL) |
f5799ae1 | 1485 | fatal("%s: received bad key", __func__); |
700318f3 | 1486 | |
1487 | if (ssh1_challenge) | |
1488 | BN_clear_free(ssh1_challenge); | |
1489 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1490 | ||
1491 | buffer_clear(m); | |
1492 | buffer_put_bignum2(m, ssh1_challenge); | |
1493 | ||
f5799ae1 | 1494 | debug3("%s sending reply", __func__); |
c9f39d2c | 1495 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
700318f3 | 1496 | |
1497 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
6a9b3198 | 1498 | |
1499 | xfree(blob); | |
1500 | key_free(key); | |
700318f3 | 1501 | return (0); |
1502 | } | |
1503 | ||
1504 | int | |
c9f39d2c | 1505 | mm_answer_rsa_response(int sock, Buffer *m) |
700318f3 | 1506 | { |
1507 | Key *key = NULL; | |
1508 | u_char *blob, *response; | |
1509 | u_int blen, len; | |
1510 | int success; | |
1511 | ||
f5799ae1 | 1512 | debug3("%s entering", __func__); |
700318f3 | 1513 | |
1514 | if (!authctxt->valid) | |
f5799ae1 | 1515 | fatal("%s: authctxt not valid", __func__); |
700318f3 | 1516 | if (ssh1_challenge == NULL) |
f5799ae1 | 1517 | fatal("%s: no ssh1_challenge", __func__); |
700318f3 | 1518 | |
1519 | blob = buffer_get_string(m, &blen); | |
1520 | if (!monitor_allowed_key(blob, blen)) | |
f5799ae1 | 1521 | fatal("%s: bad key, not previously allowed", __func__); |
700318f3 | 1522 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
f5799ae1 | 1523 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
700318f3 | 1524 | if ((key = key_from_blob(blob, blen)) == NULL) |
f5799ae1 | 1525 | fatal("%s: received bad key", __func__); |
700318f3 | 1526 | response = buffer_get_string(m, &len); |
1527 | if (len != 16) | |
f5799ae1 | 1528 | fatal("%s: received bad response to challenge", __func__); |
700318f3 | 1529 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1530 | ||
6a9b3198 | 1531 | xfree(blob); |
700318f3 | 1532 | key_free(key); |
1533 | xfree(response); | |
1534 | ||
1535 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1536 | ||
1537 | /* reset state */ | |
1538 | BN_clear_free(ssh1_challenge); | |
1539 | ssh1_challenge = NULL; | |
1540 | monitor_reset_key_state(); | |
1541 | ||
1542 | buffer_clear(m); | |
1543 | buffer_put_int(m, success); | |
c9f39d2c | 1544 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
700318f3 | 1545 | |
1546 | return (success); | |
1547 | } | |
1548 | ||
1549 | int | |
c9f39d2c | 1550 | mm_answer_term(int sock, Buffer *req) |
700318f3 | 1551 | { |
1552 | extern struct monitor *pmonitor; | |
1553 | int res, status; | |
1554 | ||
f5799ae1 | 1555 | debug3("%s: tearing down sessions", __func__); |
700318f3 | 1556 | |
1557 | /* The child is terminating */ | |
1558 | session_destroy_all(&mm_session_close); | |
1559 | ||
1560 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) | |
1561 | if (errno != EINTR) | |
1562 | exit(1); | |
1563 | ||
1564 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1565 | ||
1566 | /* Terminate process */ | |
c9f39d2c | 1567 | exit(res); |
700318f3 | 1568 | } |
1569 | ||
996d5e62 | 1570 | #ifdef SSH_AUDIT_EVENTS |
1571 | /* Report that an audit event occurred */ | |
1572 | int | |
1573 | mm_answer_audit_event(int socket, Buffer *m) | |
1574 | { | |
1575 | ssh_audit_event_t event; | |
1576 | ||
1577 | debug3("%s entering", __func__); | |
1578 | ||
1579 | event = buffer_get_int(m); | |
996d5e62 | 1580 | switch(event) { |
1581 | case SSH_AUTH_FAIL_PUBKEY: | |
1582 | case SSH_AUTH_FAIL_HOSTBASED: | |
1583 | case SSH_AUTH_FAIL_GSSAPI: | |
1584 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1585 | case SSH_LOGIN_ROOT_DENIED: | |
1586 | case SSH_CONNECTION_CLOSE: | |
1587 | case SSH_INVALID_USER: | |
1588 | audit_event(event); | |
1589 | break; | |
1590 | default: | |
1591 | fatal("Audit event type %d not permitted", event); | |
1592 | } | |
1593 | ||
1594 | return (0); | |
1595 | } | |
1596 | ||
1597 | int | |
1598 | mm_answer_audit_command(int socket, Buffer *m) | |
1599 | { | |
1600 | u_int len; | |
1601 | char *cmd; | |
1602 | ||
1603 | debug3("%s entering", __func__); | |
1604 | cmd = buffer_get_string(m, &len); | |
1605 | /* sanity check command, if so how? */ | |
1606 | audit_run_command(cmd); | |
1607 | xfree(cmd); | |
996d5e62 | 1608 | return (0); |
1609 | } | |
1610 | #endif /* SSH_AUDIT_EVENTS */ | |
1611 | ||
700318f3 | 1612 | void |
1613 | monitor_apply_keystate(struct monitor *pmonitor) | |
1614 | { | |
1615 | if (compat20) { | |
1616 | set_newkeys(MODE_IN); | |
1617 | set_newkeys(MODE_OUT); | |
1618 | } else { | |
700318f3 | 1619 | packet_set_protocol_flags(child_state.ssh1protoflags); |
f5799ae1 | 1620 | packet_set_encryption_key(child_state.ssh1key, |
1621 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1622 | xfree(child_state.ssh1key); | |
700318f3 | 1623 | } |
1624 | ||
f5799ae1 | 1625 | /* for rc4 and other stateful ciphers */ |
700318f3 | 1626 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1627 | xfree(child_state.keyout); | |
1628 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1629 | xfree(child_state.keyin); | |
1630 | ||
1631 | if (!compat20) { | |
1632 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1633 | xfree(child_state.ivout); | |
1634 | packet_set_iv(MODE_IN, child_state.ivin); | |
1635 | xfree(child_state.ivin); | |
1636 | } | |
1637 | ||
1638 | memcpy(&incoming_stream, &child_state.incoming, | |
1639 | sizeof(incoming_stream)); | |
1640 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1641 | sizeof(outgoing_stream)); | |
1642 | ||
1643 | /* Update with new address */ | |
f5799ae1 | 1644 | if (options.compression) |
1645 | mm_init_compression(pmonitor->m_zlib); | |
700318f3 | 1646 | |
1647 | /* Network I/O buffers */ | |
1648 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1649 | buffer_clear(&input); | |
1650 | buffer_append(&input, child_state.input, child_state.ilen); | |
1651 | memset(child_state.input, 0, child_state.ilen); | |
1652 | xfree(child_state.input); | |
1653 | ||
1654 | buffer_clear(&output); | |
1655 | buffer_append(&output, child_state.output, child_state.olen); | |
1656 | memset(child_state.output, 0, child_state.olen); | |
1657 | xfree(child_state.output); | |
1658 | } | |
1659 | ||
1660 | static Kex * | |
1661 | mm_get_kex(Buffer *m) | |
1662 | { | |
1663 | Kex *kex; | |
1664 | void *blob; | |
1665 | u_int bloblen; | |
1666 | ||
9108f8d9 | 1667 | kex = xcalloc(1, sizeof(*kex)); |
700318f3 | 1668 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
f5799ae1 | 1669 | if ((session_id2 == NULL) || |
1670 | (kex->session_id_len != session_id2_len) || | |
1671 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1672 | fatal("mm_get_get: internal error: bad session id"); | |
700318f3 | 1673 | kex->we_need = buffer_get_int(m); |
6a9b3198 | 1674 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
c9f39d2c | 1675 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
6a9b3198 | 1676 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
9108f8d9 | 1677 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
70e5f740 | 1678 | #ifdef GSSAPI |
1679 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; | |
1680 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server; | |
1681 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server; | |
1682 | #endif | |
700318f3 | 1683 | kex->server = 1; |
1684 | kex->hostkey_type = buffer_get_int(m); | |
1685 | kex->kex_type = buffer_get_int(m); | |
1686 | blob = buffer_get_string(m, &bloblen); | |
1687 | buffer_init(&kex->my); | |
1688 | buffer_append(&kex->my, blob, bloblen); | |
1689 | xfree(blob); | |
1690 | blob = buffer_get_string(m, &bloblen); | |
1691 | buffer_init(&kex->peer); | |
1692 | buffer_append(&kex->peer, blob, bloblen); | |
1693 | xfree(blob); | |
1694 | kex->done = 1; | |
1695 | kex->flags = buffer_get_int(m); | |
1696 | kex->client_version_string = buffer_get_string(m, NULL); | |
1697 | kex->server_version_string = buffer_get_string(m, NULL); | |
1698 | kex->load_host_key=&get_hostkey_by_type; | |
1699 | kex->host_key_index=&get_hostkey_index; | |
1700 | ||
1701 | return (kex); | |
1702 | } | |
1703 | ||
1704 | /* This function requries careful sanity checking */ | |
1705 | ||
1706 | void | |
1707 | mm_get_keystate(struct monitor *pmonitor) | |
1708 | { | |
1709 | Buffer m; | |
1710 | u_char *blob, *p; | |
1711 | u_int bloblen, plen; | |
0fff78ff | 1712 | u_int32_t seqnr, packets; |
1713 | u_int64_t blocks; | |
700318f3 | 1714 | |
f5799ae1 | 1715 | debug3("%s: Waiting for new keys", __func__); |
700318f3 | 1716 | |
1717 | buffer_init(&m); | |
1718 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); | |
1719 | if (!compat20) { | |
1720 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1721 | child_state.ssh1cipher = buffer_get_int(&m); | |
f5799ae1 | 1722 | child_state.ssh1key = buffer_get_string(&m, |
1723 | &child_state.ssh1keylen); | |
700318f3 | 1724 | child_state.ivout = buffer_get_string(&m, |
1725 | &child_state.ivoutlen); | |
1726 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1727 | goto skip; | |
1728 | } else { | |
1729 | /* Get the Kex for rekeying */ | |
1730 | *pmonitor->m_pkex = mm_get_kex(&m); | |
1731 | } | |
1732 | ||
1733 | blob = buffer_get_string(&m, &bloblen); | |
1734 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1735 | xfree(blob); | |
1736 | ||
f5799ae1 | 1737 | debug3("%s: Waiting for second key", __func__); |
700318f3 | 1738 | blob = buffer_get_string(&m, &bloblen); |
1739 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1740 | xfree(blob); | |
1741 | ||
1742 | /* Now get sequence numbers for the packets */ | |
0fff78ff | 1743 | seqnr = buffer_get_int(&m); |
1744 | blocks = buffer_get_int64(&m); | |
1745 | packets = buffer_get_int(&m); | |
1746 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1747 | seqnr = buffer_get_int(&m); | |
1748 | blocks = buffer_get_int64(&m); | |
1749 | packets = buffer_get_int(&m); | |
1750 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
700318f3 | 1751 | |
1752 | skip: | |
1753 | /* Get the key context */ | |
1754 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1755 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1756 | ||
f5799ae1 | 1757 | debug3("%s: Getting compression state", __func__); |
700318f3 | 1758 | /* Get compression state */ |
1759 | p = buffer_get_string(&m, &plen); | |
1760 | if (plen != sizeof(child_state.outgoing)) | |
f5799ae1 | 1761 | fatal("%s: bad request size", __func__); |
700318f3 | 1762 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1763 | xfree(p); | |
1764 | ||
1765 | p = buffer_get_string(&m, &plen); | |
1766 | if (plen != sizeof(child_state.incoming)) | |
f5799ae1 | 1767 | fatal("%s: bad request size", __func__); |
700318f3 | 1768 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1769 | xfree(p); | |
1770 | ||
1771 | /* Network I/O buffers */ | |
f5799ae1 | 1772 | debug3("%s: Getting Network I/O buffers", __func__); |
700318f3 | 1773 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1774 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1775 | ||
1776 | buffer_free(&m); | |
1777 | } | |
1778 | ||
1779 | ||
1780 | /* Allocation functions for zlib */ | |
1781 | void * | |
1782 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1783 | { | |
6a9b3198 | 1784 | size_t len = (size_t) size * ncount; |
700318f3 | 1785 | void *address; |
1786 | ||
41b2f314 | 1787 | if (len == 0 || ncount > SIZE_T_MAX / size) |
680cee3b | 1788 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1789 | ||
1790 | address = mm_malloc(mm, len); | |
700318f3 | 1791 | |
1792 | return (address); | |
1793 | } | |
1794 | ||
1795 | void | |
1796 | mm_zfree(struct mm_master *mm, void *address) | |
1797 | { | |
1798 | mm_free(mm, address); | |
1799 | } | |
1800 | ||
1801 | void | |
1802 | mm_init_compression(struct mm_master *mm) | |
1803 | { | |
1804 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1805 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1806 | outgoing_stream.opaque = mm; | |
1807 | ||
1808 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1809 | incoming_stream.zfree = (free_func)mm_zfree; | |
1810 | incoming_stream.opaque = mm; | |
1811 | } | |
1812 | ||
1813 | /* XXX */ | |
1814 | ||
1815 | #define FD_CLOSEONEXEC(x) do { \ | |
1816 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1817 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1818 | } while (0) | |
1819 | ||
1820 | static void | |
1821 | monitor_socketpair(int *pair) | |
1822 | { | |
1823 | #ifdef HAVE_SOCKETPAIR | |
1824 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) | |
f5799ae1 | 1825 | fatal("%s: socketpair", __func__); |
700318f3 | 1826 | #else |
1827 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
f5799ae1 | 1828 | __func__); |
700318f3 | 1829 | #endif |
1830 | FD_CLOSEONEXEC(pair[0]); | |
1831 | FD_CLOSEONEXEC(pair[1]); | |
1832 | } | |
1833 | ||
1834 | #define MM_MEMSIZE 65536 | |
1835 | ||
1836 | struct monitor * | |
1837 | monitor_init(void) | |
1838 | { | |
1839 | struct monitor *mon; | |
1840 | int pair[2]; | |
1841 | ||
9108f8d9 | 1842 | mon = xcalloc(1, sizeof(*mon)); |
700318f3 | 1843 | |
1844 | monitor_socketpair(pair); | |
1845 | ||
1846 | mon->m_recvfd = pair[0]; | |
1847 | mon->m_sendfd = pair[1]; | |
1848 | ||
1849 | /* Used to share zlib space across processes */ | |
f5799ae1 | 1850 | if (options.compression) { |
1851 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1852 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
700318f3 | 1853 | |
f5799ae1 | 1854 | /* Compression needs to share state across borders */ |
1855 | mm_init_compression(mon->m_zlib); | |
1856 | } | |
700318f3 | 1857 | |
1858 | return mon; | |
1859 | } | |
1860 | ||
1861 | void | |
1862 | monitor_reinit(struct monitor *mon) | |
1863 | { | |
1864 | int pair[2]; | |
1865 | ||
1866 | monitor_socketpair(pair); | |
1867 | ||
1868 | mon->m_recvfd = pair[0]; | |
1869 | mon->m_sendfd = pair[1]; | |
1870 | } | |
0fff78ff | 1871 | |
1872 | #ifdef GSSAPI | |
1873 | int | |
c9f39d2c | 1874 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
0fff78ff | 1875 | { |
c9f39d2c | 1876 | gss_OID_desc goid; |
0fff78ff | 1877 | OM_uint32 major; |
1878 | u_int len; | |
1879 | ||
c9f39d2c | 1880 | goid.elements = buffer_get_string(m, &len); |
1881 | goid.length = len; | |
0fff78ff | 1882 | |
c9f39d2c | 1883 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
0fff78ff | 1884 | |
c9f39d2c | 1885 | xfree(goid.elements); |
0fff78ff | 1886 | |
1887 | buffer_clear(m); | |
1888 | buffer_put_int(m, major); | |
1889 | ||
2c06c99b | 1890 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
0fff78ff | 1891 | |
1892 | /* Now we have a context, enable the step */ | |
1893 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1894 | ||
1895 | return (0); | |
1896 | } | |
1897 | ||
1898 | int | |
c9f39d2c | 1899 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
0fff78ff | 1900 | { |
1901 | gss_buffer_desc in; | |
1902 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
2c06c99b | 1903 | OM_uint32 major, minor; |
0fff78ff | 1904 | OM_uint32 flags = 0; /* GSI needs this */ |
1905 | u_int len; | |
1906 | ||
1907 | in.value = buffer_get_string(m, &len); | |
1908 | in.length = len; | |
1909 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); | |
1910 | xfree(in.value); | |
1911 | ||
1912 | buffer_clear(m); | |
1913 | buffer_put_int(m, major); | |
1914 | buffer_put_string(m, out.value, out.length); | |
1915 | buffer_put_int(m, flags); | |
c9f39d2c | 1916 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
0fff78ff | 1917 | |
1918 | gss_release_buffer(&minor, &out); | |
1919 | ||
2c06c99b | 1920 | if (major == GSS_S_COMPLETE) { |
0fff78ff | 1921 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1922 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
cdd66111 | 1923 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
70e5f740 | 1924 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); |
0fff78ff | 1925 | } |
1926 | return (0); | |
1927 | } | |
1928 | ||
cdd66111 | 1929 | int |
c9f39d2c | 1930 | mm_answer_gss_checkmic(int sock, Buffer *m) |
cdd66111 | 1931 | { |
1932 | gss_buffer_desc gssbuf, mic; | |
1933 | OM_uint32 ret; | |
1934 | u_int len; | |
1935 | ||
1936 | gssbuf.value = buffer_get_string(m, &len); | |
1937 | gssbuf.length = len; | |
1938 | mic.value = buffer_get_string(m, &len); | |
1939 | mic.length = len; | |
1940 | ||
1941 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); | |
1942 | ||
1943 | xfree(gssbuf.value); | |
1944 | xfree(mic.value); | |
1945 | ||
1946 | buffer_clear(m); | |
1947 | buffer_put_int(m, ret); | |
1948 | ||
c9f39d2c | 1949 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
cdd66111 | 1950 | |
1951 | if (!GSS_ERROR(ret)) | |
1952 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1953 | ||
1954 | return (0); | |
1955 | } | |
1956 | ||
0fff78ff | 1957 | int |
c9f39d2c | 1958 | mm_answer_gss_userok(int sock, Buffer *m) |
0fff78ff | 1959 | { |
1960 | int authenticated; | |
1961 | ||
1962 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1963 | ||
1964 | buffer_clear(m); | |
1965 | buffer_put_int(m, authenticated); | |
1966 | ||
1967 | debug3("%s: sending result %d", __func__, authenticated); | |
c9f39d2c | 1968 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
0fff78ff | 1969 | |
2c06c99b | 1970 | auth_method = "gssapi-with-mic"; |
0fff78ff | 1971 | |
1972 | /* Monitor loop will terminate if authenticated */ | |
1973 | return (authenticated); | |
1974 | } | |
70e5f740 | 1975 | |
1976 | int | |
1977 | mm_answer_gss_sign(int socket, Buffer *m) | |
1978 | { | |
1979 | gss_buffer_desc data; | |
1980 | gss_buffer_desc hash = GSS_C_EMPTY_BUFFER; | |
1981 | OM_uint32 major, minor; | |
1982 | u_int len; | |
1983 | ||
1984 | data.value = buffer_get_string(m, &len); | |
1985 | data.length = len; | |
1986 | if (data.length != 20) | |
1987 | fatal("%s: data length incorrect: %d", __func__, data.length); | |
1988 | ||
1989 | /* Save the session ID on the first time around */ | |
1990 | if (session_id2_len == 0) { | |
1991 | session_id2_len = data.length; | |
1992 | session_id2 = xmalloc(session_id2_len); | |
1993 | memcpy(session_id2, data.value, session_id2_len); | |
1994 | } | |
1995 | major = ssh_gssapi_sign(gsscontext, &data, &hash); | |
1996 | ||
1997 | xfree(data.value); | |
1998 | ||
1999 | buffer_clear(m); | |
2000 | buffer_put_int(m, major); | |
2001 | buffer_put_string(m, hash.value, hash.length); | |
2002 | ||
2003 | mm_request_send(socket, MONITOR_ANS_GSSSIGN, m); | |
2004 | ||
2005 | gss_release_buffer(&minor, &hash); | |
2006 | ||
2007 | /* Turn on getpwnam permissions */ | |
2008 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
2009 | ||
2010 | return (0); | |
2011 | } | |
2012 | ||
0fff78ff | 2013 | #endif /* GSSAPI */ |