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dc1f1948 | 1 | /* $OpenBSD: monitor.c,v 1.102 2009/05/25 06:48:01 andreas Exp $ */ |
1853d1ef | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
aa2eae64 | 29 | |
30 | #include <sys/types.h> | |
536c14e8 | 31 | #include <sys/param.h> |
5b04a8bf | 32 | #include <sys/socket.h> |
31652869 | 33 | #include "openbsd-compat/sys-tree.h" |
aa2eae64 | 34 | #include <sys/wait.h> |
1853d1ef | 35 | |
028094f4 | 36 | #include <errno.h> |
d3221cca | 37 | #include <fcntl.h> |
b5b88c19 | 38 | #ifdef HAVE_PATHS_H |
a75f5360 | 39 | #include <paths.h> |
b5b88c19 | 40 | #endif |
b1842393 | 41 | #include <pwd.h> |
ada68823 | 42 | #include <signal.h> |
24436b92 | 43 | #include <stdarg.h> |
ffa517a8 | 44 | #include <stdlib.h> |
00146caa | 45 | #include <string.h> |
aa751414 | 46 | #include <unistd.h> |
1853d1ef | 47 | |
48 | #ifdef SKEY | |
49 | #include <skey.h> | |
50 | #endif | |
51 | ||
a75f5360 | 52 | #include <openssl/dh.h> |
53 | ||
3593bdc0 | 54 | #include "openbsd-compat/sys-queue.h" |
31652869 | 55 | #include "xmalloc.h" |
1853d1ef | 56 | #include "ssh.h" |
31652869 | 57 | #include "key.h" |
58 | #include "buffer.h" | |
59 | #include "hostfile.h" | |
1853d1ef | 60 | #include "auth.h" |
31652869 | 61 | #include "cipher.h" |
1853d1ef | 62 | #include "kex.h" |
63 | #include "dh.h" | |
a655c012 | 64 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
65 | #undef TARGET_OS_MAC | |
9b08c23f | 66 | #include "zlib.h" |
a655c012 | 67 | #define TARGET_OS_MAC 1 |
68 | #else | |
69 | #include "zlib.h" | |
70 | #endif | |
1853d1ef | 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" | |
31652869 | 82 | #ifdef GSSAPI |
83 | #include "ssh-gss.h" | |
84 | #endif | |
1853d1ef | 85 | #include "monitor_wrap.h" |
86 | #include "monitor_fdpass.h" | |
1853d1ef | 87 | #include "misc.h" |
1853d1ef | 88 | #include "compat.h" |
89 | #include "ssh2.h" | |
5adf6b9a | 90 | #include "jpake.h" |
1853d1ef | 91 | |
7364bd04 | 92 | #ifdef GSSAPI |
7364bd04 | 93 | static Gssctxt *gsscontext = NULL; |
94 | #endif | |
95 | ||
1853d1ef | 96 | /* Imports */ |
97 | extern ServerOptions options; | |
98 | extern u_int utmp_len; | |
99 | extern Newkeys *current_keys[]; | |
100 | extern z_stream incoming_stream; | |
101 | extern z_stream outgoing_stream; | |
102 | extern u_char session_id[]; | |
1853d1ef | 103 | extern Buffer auth_debug; |
104 | extern int auth_debug_init; | |
be2ca0c9 | 105 | extern Buffer loginmsg; |
1853d1ef | 106 | |
107 | /* State exported from the child */ | |
108 | ||
109 | struct { | |
110 | z_stream incoming; | |
111 | z_stream outgoing; | |
112 | u_char *keyin; | |
113 | u_int keyinlen; | |
114 | u_char *keyout; | |
115 | u_int keyoutlen; | |
116 | u_char *ivin; | |
117 | u_int ivinlen; | |
118 | u_char *ivout; | |
119 | u_int ivoutlen; | |
9459414c | 120 | u_char *ssh1key; |
121 | u_int ssh1keylen; | |
1853d1ef | 122 | int ssh1cipher; |
123 | int ssh1protoflags; | |
124 | u_char *input; | |
125 | u_int ilen; | |
126 | u_char *output; | |
127 | u_int olen; | |
128 | } child_state; | |
129 | ||
b8e04133 | 130 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 131 | |
132 | int mm_answer_moduli(int, Buffer *); | |
133 | int mm_answer_sign(int, Buffer *); | |
134 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 135 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 136 | int mm_answer_authserv(int, Buffer *); |
137 | int mm_answer_authpassword(int, Buffer *); | |
138 | int mm_answer_bsdauthquery(int, Buffer *); | |
139 | int mm_answer_bsdauthrespond(int, Buffer *); | |
140 | int mm_answer_skeyquery(int, Buffer *); | |
141 | int mm_answer_skeyrespond(int, Buffer *); | |
142 | int mm_answer_keyallowed(int, Buffer *); | |
143 | int mm_answer_keyverify(int, Buffer *); | |
144 | int mm_answer_pty(int, Buffer *); | |
145 | int mm_answer_pty_cleanup(int, Buffer *); | |
146 | int mm_answer_term(int, Buffer *); | |
147 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
148 | int mm_answer_rsa_challenge(int, Buffer *); | |
149 | int mm_answer_rsa_response(int, Buffer *); | |
150 | int mm_answer_sesskey(int, Buffer *); | |
151 | int mm_answer_sessid(int, Buffer *); | |
5adf6b9a | 152 | int mm_answer_jpake_get_pwdata(int, Buffer *); |
153 | int mm_answer_jpake_step1(int, Buffer *); | |
154 | int mm_answer_jpake_step2(int, Buffer *); | |
155 | int mm_answer_jpake_key_confirm(int, Buffer *); | |
156 | int mm_answer_jpake_check_confirm(int, Buffer *); | |
1853d1ef | 157 | |
ad200abb | 158 | #ifdef USE_PAM |
159 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 160 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 161 | int mm_answer_pam_init_ctx(int, Buffer *); |
162 | int mm_answer_pam_query(int, Buffer *); | |
163 | int mm_answer_pam_respond(int, Buffer *); | |
164 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 165 | #endif |
166 | ||
7364bd04 | 167 | #ifdef GSSAPI |
168 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
169 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
170 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 171 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 172 | #endif |
696f6bef | 173 | |
6039eeef | 174 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 175 | int mm_answer_audit_event(int, Buffer *); |
176 | int mm_answer_audit_command(int, Buffer *); | |
177 | #endif | |
178 | ||
1853d1ef | 179 | static Authctxt *authctxt; |
180 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
181 | ||
182 | /* local state for key verify */ | |
183 | static u_char *key_blob = NULL; | |
184 | static u_int key_bloblen = 0; | |
185 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 186 | static char *hostbased_cuser = NULL; |
187 | static char *hostbased_chost = NULL; | |
1853d1ef | 188 | static char *auth_method = "unknown"; |
a27002e5 | 189 | static u_int session_id2_len = 0; |
521d606b | 190 | static u_char *session_id2 = NULL; |
3a39206f | 191 | static pid_t monitor_child_pid; |
1853d1ef | 192 | |
193 | struct mon_table { | |
194 | enum monitor_reqtype type; | |
195 | int flags; | |
196 | int (*f)(int, Buffer *); | |
197 | }; | |
198 | ||
199 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
200 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
201 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 202 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 203 | |
204 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
205 | ||
206 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
207 | ||
208 | struct mon_table mon_dispatch_proto20[] = { | |
209 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
210 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
211 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
212 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 213 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 214 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 215 | #ifdef USE_PAM |
216 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 217 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 218 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
219 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
220 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
221 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 222 | #endif |
6039eeef | 223 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 224 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 225 | #endif |
1853d1ef | 226 | #ifdef BSD_AUTH |
227 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 228 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 229 | #endif |
230 | #ifdef SKEY | |
231 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
232 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
233 | #endif | |
234 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
235 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 236 | #ifdef GSSAPI |
237 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
238 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
239 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 240 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
5adf6b9a | 241 | #endif |
242 | #ifdef JPAKE | |
243 | {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, | |
244 | {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, | |
245 | {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, | |
246 | {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, | |
247 | {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, | |
802e01b8 | 248 | #endif |
1853d1ef | 249 | {0, 0, NULL} |
250 | }; | |
251 | ||
252 | struct mon_table mon_dispatch_postauth20[] = { | |
253 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
254 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
255 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
256 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
257 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 258 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 259 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
260 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
261 | #endif | |
1853d1ef | 262 | {0, 0, NULL} |
263 | }; | |
264 | ||
265 | struct mon_table mon_dispatch_proto15[] = { | |
266 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
267 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
268 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
269 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 270 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
271 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 272 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
273 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
274 | #ifdef BSD_AUTH | |
275 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 276 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 277 | #endif |
278 | #ifdef SKEY | |
279 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
280 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 281 | #endif |
282 | #ifdef USE_PAM | |
283 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 284 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 285 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
286 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
287 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
288 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 289 | #endif |
6039eeef | 290 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 291 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 292 | #endif |
293 | {0, 0, NULL} | |
294 | }; | |
295 | ||
296 | struct mon_table mon_dispatch_postauth15[] = { | |
297 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
298 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
299 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 300 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 301 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
bb09a477 | 302 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 303 | #endif |
1853d1ef | 304 | {0, 0, NULL} |
305 | }; | |
306 | ||
307 | struct mon_table *mon_dispatch; | |
308 | ||
309 | /* Specifies if a certain message is allowed at the moment */ | |
310 | ||
311 | static void | |
312 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
313 | { | |
314 | while (ent->f != NULL) { | |
315 | if (ent->type == type) { | |
316 | ent->flags &= ~MON_PERMIT; | |
317 | ent->flags |= permit ? MON_PERMIT : 0; | |
318 | return; | |
319 | } | |
320 | ent++; | |
321 | } | |
322 | } | |
323 | ||
324 | static void | |
325 | monitor_permit_authentications(int permit) | |
326 | { | |
327 | struct mon_table *ent = mon_dispatch; | |
328 | ||
329 | while (ent->f != NULL) { | |
330 | if (ent->flags & MON_AUTH) { | |
331 | ent->flags &= ~MON_PERMIT; | |
332 | ent->flags |= permit ? MON_PERMIT : 0; | |
333 | } | |
334 | ent++; | |
335 | } | |
336 | } | |
337 | ||
2362db19 | 338 | void |
339 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 340 | { |
341 | struct mon_table *ent; | |
342 | int authenticated = 0; | |
343 | ||
344 | debug3("preauth child monitor started"); | |
345 | ||
2362db19 | 346 | authctxt = _authctxt; |
347 | memset(authctxt, 0, sizeof(*authctxt)); | |
348 | ||
e05df884 | 349 | authctxt->loginmsg = &loginmsg; |
350 | ||
1853d1ef | 351 | if (compat20) { |
352 | mon_dispatch = mon_dispatch_proto20; | |
353 | ||
354 | /* Permit requests for moduli and signatures */ | |
355 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
356 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
357 | } else { | |
358 | mon_dispatch = mon_dispatch_proto15; | |
359 | ||
360 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
361 | } | |
362 | ||
1853d1ef | 363 | /* The first few requests do not require asynchronous access */ |
364 | while (!authenticated) { | |
c023a130 | 365 | auth_method = "unknown"; |
89916e8c | 366 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); |
1853d1ef | 367 | if (authenticated) { |
368 | if (!(ent->flags & MON_AUTHDECIDE)) | |
369 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 370 | __func__, ent->type); |
1853d1ef | 371 | if (authctxt->pw->pw_uid == 0 && |
372 | !auth_root_allowed(auth_method)) | |
373 | authenticated = 0; | |
5b9e2464 | 374 | #ifdef USE_PAM |
375 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 376 | if (options.use_pam && authenticated) { |
5b9e2464 | 377 | Buffer m; |
378 | ||
379 | buffer_init(&m); | |
aff51935 | 380 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 381 | MONITOR_REQ_PAM_ACCOUNT, &m); |
382 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
383 | buffer_free(&m); | |
384 | } | |
385 | #endif | |
1853d1ef | 386 | } |
387 | ||
c023a130 | 388 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 389 | auth_log(authctxt, authenticated, auth_method, |
390 | compat20 ? " ssh2" : ""); | |
391 | if (!authenticated) | |
392 | authctxt->failures++; | |
393 | } | |
5adf6b9a | 394 | #ifdef JPAKE |
395 | /* Cleanup JPAKE context after authentication */ | |
396 | if (ent->flags & MON_AUTHDECIDE) { | |
397 | if (authctxt->jpake_ctx != NULL) { | |
398 | jpake_free(authctxt->jpake_ctx); | |
399 | authctxt->jpake_ctx = NULL; | |
400 | } | |
401 | } | |
402 | #endif | |
1853d1ef | 403 | } |
404 | ||
405 | if (!authctxt->valid) | |
1588c277 | 406 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 407 | if (strcmp(auth_method, "unknown") == 0) |
408 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 409 | |
410 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 411 | __func__, authctxt->user); |
1853d1ef | 412 | |
b5a28cbc | 413 | mm_get_keystate(pmonitor); |
1853d1ef | 414 | } |
415 | ||
3a39206f | 416 | static void |
417 | monitor_set_child_handler(pid_t pid) | |
418 | { | |
419 | monitor_child_pid = pid; | |
420 | } | |
421 | ||
422 | static void | |
ca75d7de | 423 | monitor_child_handler(int sig) |
3a39206f | 424 | { |
ca75d7de | 425 | kill(monitor_child_pid, sig); |
3a39206f | 426 | } |
427 | ||
1853d1ef | 428 | void |
b5a28cbc | 429 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 430 | { |
3a39206f | 431 | monitor_set_child_handler(pmonitor->m_pid); |
432 | signal(SIGHUP, &monitor_child_handler); | |
433 | signal(SIGTERM, &monitor_child_handler); | |
21cd42db | 434 | signal(SIGINT, &monitor_child_handler); |
3a39206f | 435 | |
1853d1ef | 436 | if (compat20) { |
437 | mon_dispatch = mon_dispatch_postauth20; | |
438 | ||
439 | /* Permit requests for moduli and signatures */ | |
440 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
441 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
442 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 443 | } else { |
444 | mon_dispatch = mon_dispatch_postauth15; | |
445 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
446 | } | |
447 | if (!no_pty_flag) { | |
448 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
449 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
450 | } | |
451 | ||
452 | for (;;) | |
b5a28cbc | 453 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 454 | } |
455 | ||
456 | void | |
b5a28cbc | 457 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 458 | { |
0496cf34 | 459 | if (options.compression) { |
460 | /* The member allocation is not visible, so sync it */ | |
461 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
462 | } | |
1853d1ef | 463 | } |
464 | ||
465 | int | |
b5a28cbc | 466 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 467 | struct mon_table **pent) |
468 | { | |
469 | Buffer m; | |
470 | int ret; | |
471 | u_char type; | |
472 | ||
473 | buffer_init(&m); | |
474 | ||
b5a28cbc | 475 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 476 | type = buffer_get_char(&m); |
477 | ||
1588c277 | 478 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 479 | |
480 | while (ent->f != NULL) { | |
481 | if (ent->type == type) | |
482 | break; | |
483 | ent++; | |
484 | } | |
485 | ||
486 | if (ent->f != NULL) { | |
487 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 488 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 489 | type); |
b5a28cbc | 490 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 491 | buffer_free(&m); |
492 | ||
493 | /* The child may use this request only once, disable it */ | |
494 | if (ent->flags & MON_ONCE) { | |
1588c277 | 495 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 496 | type); |
497 | ent->flags &= ~MON_PERMIT; | |
498 | } | |
499 | ||
500 | if (pent != NULL) | |
501 | *pent = ent; | |
502 | ||
503 | return ret; | |
504 | } | |
505 | ||
1588c277 | 506 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 507 | |
508 | /* NOTREACHED */ | |
509 | return (-1); | |
510 | } | |
511 | ||
512 | /* allowed key state */ | |
513 | static int | |
514 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
515 | { | |
516 | /* make sure key is allowed */ | |
517 | if (key_blob == NULL || key_bloblen != bloblen || | |
518 | memcmp(key_blob, blob, key_bloblen)) | |
519 | return (0); | |
520 | return (1); | |
521 | } | |
522 | ||
523 | static void | |
524 | monitor_reset_key_state(void) | |
525 | { | |
526 | /* reset state */ | |
527 | if (key_blob != NULL) | |
528 | xfree(key_blob); | |
529 | if (hostbased_cuser != NULL) | |
530 | xfree(hostbased_cuser); | |
531 | if (hostbased_chost != NULL) | |
532 | xfree(hostbased_chost); | |
533 | key_blob = NULL; | |
534 | key_bloblen = 0; | |
535 | key_blobtype = MM_NOKEY; | |
536 | hostbased_cuser = NULL; | |
537 | hostbased_chost = NULL; | |
538 | } | |
539 | ||
540 | int | |
ca75d7de | 541 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 542 | { |
543 | DH *dh; | |
544 | int min, want, max; | |
545 | ||
546 | min = buffer_get_int(m); | |
547 | want = buffer_get_int(m); | |
548 | max = buffer_get_int(m); | |
549 | ||
550 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 551 | __func__, min, want, max); |
1853d1ef | 552 | /* We need to check here, too, in case the child got corrupted */ |
553 | if (max < min || want < min || max < want) | |
554 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 555 | __func__, min, want, max); |
1853d1ef | 556 | |
557 | buffer_clear(m); | |
558 | ||
559 | dh = choose_dh(min, want, max); | |
560 | if (dh == NULL) { | |
561 | buffer_put_char(m, 0); | |
562 | return (0); | |
563 | } else { | |
564 | /* Send first bignum */ | |
565 | buffer_put_char(m, 1); | |
566 | buffer_put_bignum2(m, dh->p); | |
567 | buffer_put_bignum2(m, dh->g); | |
568 | ||
569 | DH_free(dh); | |
570 | } | |
ca75d7de | 571 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 572 | return (0); |
573 | } | |
574 | ||
575 | int | |
ca75d7de | 576 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 577 | { |
578 | Key *key; | |
579 | u_char *p; | |
580 | u_char *signature; | |
581 | u_int siglen, datlen; | |
582 | int keyid; | |
583 | ||
1588c277 | 584 | debug3("%s", __func__); |
1853d1ef | 585 | |
586 | keyid = buffer_get_int(m); | |
587 | p = buffer_get_string(m, &datlen); | |
588 | ||
2ff8003a | 589 | /* |
b4bbf172 | 590 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 591 | * SHA256 (32 byte) hashes |
592 | */ | |
593 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 594 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 595 | |
521d606b | 596 | /* save session id, it will be passed on the first call */ |
597 | if (session_id2_len == 0) { | |
598 | session_id2_len = datlen; | |
599 | session_id2 = xmalloc(session_id2_len); | |
600 | memcpy(session_id2, p, session_id2_len); | |
601 | } | |
602 | ||
1853d1ef | 603 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 604 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 605 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 606 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 607 | |
d1ff09ba | 608 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 609 | |
610 | buffer_clear(m); | |
611 | buffer_put_string(m, signature, siglen); | |
612 | ||
613 | xfree(p); | |
614 | xfree(signature); | |
615 | ||
ca75d7de | 616 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 617 | |
618 | /* Turn on permissions for getpwnam */ | |
619 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
620 | ||
621 | return (0); | |
622 | } | |
623 | ||
624 | /* Retrieves the password entry and also checks if the user is permitted */ | |
625 | ||
626 | int | |
ca75d7de | 627 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 628 | { |
18a8f313 | 629 | char *username; |
1853d1ef | 630 | struct passwd *pwent; |
631 | int allowed = 0; | |
632 | ||
1588c277 | 633 | debug3("%s", __func__); |
1853d1ef | 634 | |
635 | if (authctxt->attempt++ != 0) | |
1588c277 | 636 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 637 | |
18a8f313 | 638 | username = buffer_get_string(m, NULL); |
1853d1ef | 639 | |
18a8f313 | 640 | pwent = getpwnamallow(username); |
1853d1ef | 641 | |
18a8f313 | 642 | authctxt->user = xstrdup(username); |
643 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
644 | xfree(username); | |
1853d1ef | 645 | |
646 | buffer_clear(m); | |
647 | ||
648 | if (pwent == NULL) { | |
649 | buffer_put_char(m, 0); | |
b2a5802b | 650 | authctxt->pw = fakepw(); |
1853d1ef | 651 | goto out; |
652 | } | |
653 | ||
654 | allowed = 1; | |
655 | authctxt->pw = pwent; | |
656 | authctxt->valid = 1; | |
657 | ||
658 | buffer_put_char(m, 1); | |
659 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
660 | buffer_put_cstring(m, pwent->pw_name); | |
661 | buffer_put_cstring(m, "*"); | |
662 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 663 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 664 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 665 | #endif |
1853d1ef | 666 | buffer_put_cstring(m, pwent->pw_dir); |
667 | buffer_put_cstring(m, pwent->pw_shell); | |
dc0cae51 | 668 | |
669 | out: | |
03bcbf84 | 670 | buffer_put_string(m, &options, sizeof(options)); |
671 | if (options.banner != NULL) | |
672 | buffer_put_cstring(m, options.banner); | |
1588c277 | 673 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 674 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 675 | |
676 | /* For SSHv1 allow authentication now */ | |
677 | if (!compat20) | |
678 | monitor_permit_authentications(1); | |
94a73cdc | 679 | else { |
1853d1ef | 680 | /* Allow service/style information on the auth context */ |
681 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 682 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
683 | } | |
1853d1ef | 684 | |
efe44db6 | 685 | #ifdef USE_PAM |
7fceb20d | 686 | if (options.use_pam) |
687 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 688 | #endif |
1853d1ef | 689 | |
690 | return (0); | |
691 | } | |
692 | ||
ca75d7de | 693 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 694 | { |
695 | char *banner; | |
696 | ||
697 | buffer_clear(m); | |
698 | banner = auth2_read_banner(); | |
699 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 700 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 701 | |
702 | if (banner != NULL) | |
30e37ee6 | 703 | xfree(banner); |
94a73cdc | 704 | |
705 | return (0); | |
706 | } | |
707 | ||
1853d1ef | 708 | int |
ca75d7de | 709 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 710 | { |
711 | monitor_permit_authentications(1); | |
712 | ||
713 | authctxt->service = buffer_get_string(m, NULL); | |
714 | authctxt->style = buffer_get_string(m, NULL); | |
715 | debug3("%s: service=%s, style=%s", | |
1588c277 | 716 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 717 | |
718 | if (strlen(authctxt->style) == 0) { | |
719 | xfree(authctxt->style); | |
720 | authctxt->style = NULL; | |
721 | } | |
722 | ||
723 | return (0); | |
724 | } | |
725 | ||
726 | int | |
ca75d7de | 727 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 728 | { |
729 | static int call_count; | |
730 | char *passwd; | |
d341742a | 731 | int authenticated; |
732 | u_int plen; | |
1853d1ef | 733 | |
734 | passwd = buffer_get_string(m, &plen); | |
735 | /* Only authenticate if the context is valid */ | |
aa586f8e | 736 | authenticated = options.password_authentication && |
96d0bf74 | 737 | auth_password(authctxt, passwd); |
1853d1ef | 738 | memset(passwd, 0, strlen(passwd)); |
739 | xfree(passwd); | |
740 | ||
741 | buffer_clear(m); | |
742 | buffer_put_int(m, authenticated); | |
743 | ||
1588c277 | 744 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 745 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 746 | |
747 | call_count++; | |
748 | if (plen == 0 && call_count == 1) | |
749 | auth_method = "none"; | |
750 | else | |
751 | auth_method = "password"; | |
752 | ||
753 | /* Causes monitor loop to terminate if authenticated */ | |
754 | return (authenticated); | |
755 | } | |
756 | ||
757 | #ifdef BSD_AUTH | |
758 | int | |
ca75d7de | 759 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 760 | { |
761 | char *name, *infotxt; | |
762 | u_int numprompts; | |
763 | u_int *echo_on; | |
764 | char **prompts; | |
6d6c25e3 | 765 | u_int success; |
1853d1ef | 766 | |
6d6c25e3 | 767 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
768 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 769 | |
770 | buffer_clear(m); | |
6d6c25e3 | 771 | buffer_put_int(m, success); |
772 | if (success) | |
1853d1ef | 773 | buffer_put_cstring(m, prompts[0]); |
774 | ||
6d6c25e3 | 775 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 776 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 777 | |
6d6c25e3 | 778 | if (success) { |
1853d1ef | 779 | xfree(name); |
780 | xfree(infotxt); | |
781 | xfree(prompts); | |
782 | xfree(echo_on); | |
783 | } | |
784 | ||
785 | return (0); | |
786 | } | |
787 | ||
788 | int | |
ca75d7de | 789 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 790 | { |
791 | char *response; | |
792 | int authok; | |
793 | ||
794 | if (authctxt->as == 0) | |
1588c277 | 795 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 796 | |
797 | response = buffer_get_string(m, NULL); | |
aa586f8e | 798 | authok = options.challenge_response_authentication && |
799 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 800 | authctxt->as = NULL; |
1588c277 | 801 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 802 | xfree(response); |
803 | ||
804 | buffer_clear(m); | |
805 | buffer_put_int(m, authok); | |
806 | ||
1588c277 | 807 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 808 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 809 | |
810 | auth_method = "bsdauth"; | |
811 | ||
812 | return (authok != 0); | |
813 | } | |
814 | #endif | |
815 | ||
816 | #ifdef SKEY | |
817 | int | |
ca75d7de | 818 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 819 | { |
820 | struct skey skey; | |
821 | char challenge[1024]; | |
6d6c25e3 | 822 | u_int success; |
1853d1ef | 823 | |
f2b7b5c8 | 824 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
825 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 826 | |
827 | buffer_clear(m); | |
6d6c25e3 | 828 | buffer_put_int(m, success); |
829 | if (success) | |
1853d1ef | 830 | buffer_put_cstring(m, challenge); |
831 | ||
6d6c25e3 | 832 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 833 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 834 | |
835 | return (0); | |
836 | } | |
837 | ||
838 | int | |
ca75d7de | 839 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 840 | { |
841 | char *response; | |
842 | int authok; | |
843 | ||
844 | response = buffer_get_string(m, NULL); | |
845 | ||
aa586f8e | 846 | authok = (options.challenge_response_authentication && |
847 | authctxt->valid && | |
1853d1ef | 848 | skey_haskey(authctxt->pw->pw_name) == 0 && |
849 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
850 | ||
851 | xfree(response); | |
852 | ||
853 | buffer_clear(m); | |
854 | buffer_put_int(m, authok); | |
855 | ||
1588c277 | 856 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 857 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 858 | |
859 | auth_method = "skey"; | |
860 | ||
861 | return (authok != 0); | |
862 | } | |
863 | #endif | |
864 | ||
ad200abb | 865 | #ifdef USE_PAM |
866 | int | |
8b3ec5fd | 867 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 868 | { |
7fceb20d | 869 | if (!options.use_pam) |
870 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
871 | ||
529d73ab | 872 | start_pam(authctxt); |
ad200abb | 873 | |
5b9e2464 | 874 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
875 | ||
ad200abb | 876 | return (0); |
877 | } | |
05114c74 | 878 | |
5b9e2464 | 879 | int |
8b3ec5fd | 880 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 881 | { |
882 | u_int ret; | |
b6453d99 | 883 | |
5b9e2464 | 884 | if (!options.use_pam) |
885 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
886 | ||
887 | ret = do_pam_account(); | |
888 | ||
889 | buffer_put_int(m, ret); | |
cfb60d3a | 890 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 891 | |
8b3ec5fd | 892 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 893 | |
894 | return (ret); | |
895 | } | |
896 | ||
05114c74 | 897 | static void *sshpam_ctxt, *sshpam_authok; |
898 | extern KbdintDevice sshpam_device; | |
899 | ||
900 | int | |
8b3ec5fd | 901 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 902 | { |
903 | ||
904 | debug3("%s", __func__); | |
905 | authctxt->user = buffer_get_string(m, NULL); | |
906 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
907 | sshpam_authok = NULL; | |
908 | buffer_clear(m); | |
909 | if (sshpam_ctxt != NULL) { | |
910 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
911 | buffer_put_int(m, 1); | |
912 | } else { | |
913 | buffer_put_int(m, 0); | |
914 | } | |
8b3ec5fd | 915 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 916 | return (0); |
917 | } | |
918 | ||
919 | int | |
8b3ec5fd | 920 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 921 | { |
922 | char *name, *info, **prompts; | |
a1a073cc | 923 | u_int i, num, *echo_on; |
924 | int ret; | |
05114c74 | 925 | |
926 | debug3("%s", __func__); | |
927 | sshpam_authok = NULL; | |
928 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
929 | if (ret == 0 && num == 0) | |
930 | sshpam_authok = sshpam_ctxt; | |
931 | if (num > 1 || name == NULL || info == NULL) | |
932 | ret = -1; | |
933 | buffer_clear(m); | |
934 | buffer_put_int(m, ret); | |
935 | buffer_put_cstring(m, name); | |
936 | xfree(name); | |
937 | buffer_put_cstring(m, info); | |
938 | xfree(info); | |
939 | buffer_put_int(m, num); | |
940 | for (i = 0; i < num; ++i) { | |
941 | buffer_put_cstring(m, prompts[i]); | |
942 | xfree(prompts[i]); | |
943 | buffer_put_int(m, echo_on[i]); | |
944 | } | |
945 | if (prompts != NULL) | |
946 | xfree(prompts); | |
947 | if (echo_on != NULL) | |
948 | xfree(echo_on); | |
2ae7f715 | 949 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 950 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 951 | return (0); |
952 | } | |
953 | ||
954 | int | |
8b3ec5fd | 955 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 956 | { |
957 | char **resp; | |
a1a073cc | 958 | u_int i, num; |
959 | int ret; | |
05114c74 | 960 | |
961 | debug3("%s", __func__); | |
962 | sshpam_authok = NULL; | |
963 | num = buffer_get_int(m); | |
964 | if (num > 0) { | |
01d35895 | 965 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 966 | for (i = 0; i < num; ++i) |
967 | resp[i] = buffer_get_string(m, NULL); | |
968 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
969 | for (i = 0; i < num; ++i) | |
970 | xfree(resp[i]); | |
971 | xfree(resp); | |
972 | } else { | |
973 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
974 | } | |
975 | buffer_clear(m); | |
976 | buffer_put_int(m, ret); | |
8b3ec5fd | 977 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 978 | auth_method = "keyboard-interactive/pam"; |
979 | if (ret == 0) | |
980 | sshpam_authok = sshpam_ctxt; | |
981 | return (0); | |
982 | } | |
983 | ||
984 | int | |
8b3ec5fd | 985 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 986 | { |
987 | ||
988 | debug3("%s", __func__); | |
989 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
990 | buffer_clear(m); | |
8b3ec5fd | 991 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 992 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 993 | return (sshpam_authok == sshpam_ctxt); |
994 | } | |
ad200abb | 995 | #endif |
996 | ||
1853d1ef | 997 | static void |
998 | mm_append_debug(Buffer *m) | |
999 | { | |
1000 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 1001 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 1002 | buffer_append(m, buffer_ptr(&auth_debug), |
1003 | buffer_len(&auth_debug)); | |
1004 | buffer_clear(&auth_debug); | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | int | |
ca75d7de | 1009 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 1010 | { |
1011 | Key *key; | |
661e45a0 | 1012 | char *cuser, *chost; |
1013 | u_char *blob; | |
1853d1ef | 1014 | u_int bloblen; |
1015 | enum mm_keytype type = 0; | |
1016 | int allowed = 0; | |
1017 | ||
1588c277 | 1018 | debug3("%s entering", __func__); |
1853d1ef | 1019 | |
1020 | type = buffer_get_int(m); | |
1021 | cuser = buffer_get_string(m, NULL); | |
1022 | chost = buffer_get_string(m, NULL); | |
1023 | blob = buffer_get_string(m, &bloblen); | |
1024 | ||
1025 | key = key_from_blob(blob, bloblen); | |
1026 | ||
1027 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1028 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 1029 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 1030 | |
1588c277 | 1031 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1032 | |
fdaef11e | 1033 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1034 | switch (type) { |
1853d1ef | 1035 | case MM_USERKEY: |
aa586f8e | 1036 | allowed = options.pubkey_authentication && |
1037 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1038 | auth_method = "publickey"; |
52ad6b9a | 1039 | if (options.pubkey_authentication && allowed != 1) |
1040 | auth_clear_options(); | |
1853d1ef | 1041 | break; |
1042 | case MM_HOSTKEY: | |
aa586f8e | 1043 | allowed = options.hostbased_authentication && |
1044 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1045 | cuser, chost, key); |
c023a130 | 1046 | auth_method = "hostbased"; |
1853d1ef | 1047 | break; |
1048 | case MM_RSAHOSTKEY: | |
1049 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1050 | allowed = options.rhosts_rsa_authentication && |
1051 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1052 | cuser, chost, key); |
52ad6b9a | 1053 | if (options.rhosts_rsa_authentication && allowed != 1) |
1054 | auth_clear_options(); | |
c023a130 | 1055 | auth_method = "rsa"; |
1853d1ef | 1056 | break; |
1057 | default: | |
1588c277 | 1058 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1059 | break; |
1060 | } | |
1853d1ef | 1061 | } |
3e2f2431 | 1062 | if (key != NULL) |
1063 | key_free(key); | |
1853d1ef | 1064 | |
1065 | /* clear temporarily storage (used by verify) */ | |
1066 | monitor_reset_key_state(); | |
1067 | ||
1068 | if (allowed) { | |
1069 | /* Save temporarily for comparison in verify */ | |
1070 | key_blob = blob; | |
1071 | key_bloblen = bloblen; | |
1072 | key_blobtype = type; | |
1073 | hostbased_cuser = cuser; | |
1074 | hostbased_chost = chost; | |
98d40a74 | 1075 | } else { |
c023a130 | 1076 | /* Log failed attempt */ |
1077 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1078 | xfree(blob); |
1079 | xfree(cuser); | |
1080 | xfree(chost); | |
1853d1ef | 1081 | } |
1082 | ||
1083 | debug3("%s: key %p is %s", | |
c54d3d1c | 1084 | __func__, key, allowed ? "allowed" : "not allowed"); |
1853d1ef | 1085 | |
1086 | buffer_clear(m); | |
1087 | buffer_put_int(m, allowed); | |
92e15201 | 1088 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1089 | |
1090 | mm_append_debug(m); | |
1091 | ||
ca75d7de | 1092 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1093 | |
1094 | if (type == MM_RSAHOSTKEY) | |
1095 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1096 | ||
1097 | return (0); | |
1098 | } | |
1099 | ||
1100 | static int | |
1101 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1102 | { | |
1103 | Buffer b; | |
661e45a0 | 1104 | char *p; |
1853d1ef | 1105 | u_int len; |
1106 | int fail = 0; | |
1853d1ef | 1107 | |
1108 | buffer_init(&b); | |
1109 | buffer_append(&b, data, datalen); | |
1110 | ||
1111 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1112 | p = buffer_ptr(&b); |
1113 | len = buffer_len(&b); | |
1114 | if ((session_id2 == NULL) || | |
1115 | (len < session_id2_len) || | |
1116 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1117 | fail++; | |
1853d1ef | 1118 | buffer_consume(&b, session_id2_len); |
1119 | } else { | |
521d606b | 1120 | p = buffer_get_string(&b, &len); |
1121 | if ((session_id2 == NULL) || | |
1122 | (len != session_id2_len) || | |
1123 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1124 | fail++; |
521d606b | 1125 | xfree(p); |
1853d1ef | 1126 | } |
1127 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1128 | fail++; | |
1129 | p = buffer_get_string(&b, NULL); | |
1130 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1131 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1132 | authctxt->user, p); |
1133 | fail++; | |
1134 | } | |
1135 | xfree(p); | |
1136 | buffer_skip_string(&b); | |
1137 | if (datafellows & SSH_BUG_PKAUTH) { | |
1138 | if (!buffer_get_char(&b)) | |
1139 | fail++; | |
1140 | } else { | |
1141 | p = buffer_get_string(&b, NULL); | |
1142 | if (strcmp("publickey", p) != 0) | |
1143 | fail++; | |
1144 | xfree(p); | |
1145 | if (!buffer_get_char(&b)) | |
1146 | fail++; | |
1147 | buffer_skip_string(&b); | |
1148 | } | |
1149 | buffer_skip_string(&b); | |
1150 | if (buffer_len(&b) != 0) | |
1151 | fail++; | |
1152 | buffer_free(&b); | |
1153 | return (fail == 0); | |
1154 | } | |
1155 | ||
1156 | static int | |
661e45a0 | 1157 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1158 | char *chost) | |
1853d1ef | 1159 | { |
1160 | Buffer b; | |
661e45a0 | 1161 | char *p; |
1853d1ef | 1162 | u_int len; |
1163 | int fail = 0; | |
1853d1ef | 1164 | |
1165 | buffer_init(&b); | |
1166 | buffer_append(&b, data, datalen); | |
1167 | ||
521d606b | 1168 | p = buffer_get_string(&b, &len); |
1169 | if ((session_id2 == NULL) || | |
1170 | (len != session_id2_len) || | |
1171 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1172 | fail++; |
521d606b | 1173 | xfree(p); |
1174 | ||
1853d1ef | 1175 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1176 | fail++; | |
1177 | p = buffer_get_string(&b, NULL); | |
1178 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1179 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1180 | authctxt->user, p); |
1181 | fail++; | |
1182 | } | |
1183 | xfree(p); | |
1184 | buffer_skip_string(&b); /* service */ | |
1185 | p = buffer_get_string(&b, NULL); | |
1186 | if (strcmp(p, "hostbased") != 0) | |
1187 | fail++; | |
1188 | xfree(p); | |
1189 | buffer_skip_string(&b); /* pkalg */ | |
1190 | buffer_skip_string(&b); /* pkblob */ | |
1191 | ||
1192 | /* verify client host, strip trailing dot if necessary */ | |
1193 | p = buffer_get_string(&b, NULL); | |
1194 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1195 | p[len - 1] = '\0'; | |
1196 | if (strcmp(p, chost) != 0) | |
1197 | fail++; | |
1198 | xfree(p); | |
1199 | ||
1200 | /* verify client user */ | |
1201 | p = buffer_get_string(&b, NULL); | |
1202 | if (strcmp(p, cuser) != 0) | |
1203 | fail++; | |
1204 | xfree(p); | |
1205 | ||
1206 | if (buffer_len(&b) != 0) | |
1207 | fail++; | |
1208 | buffer_free(&b); | |
1209 | return (fail == 0); | |
1210 | } | |
1211 | ||
1212 | int | |
ca75d7de | 1213 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1214 | { |
1215 | Key *key; | |
1216 | u_char *signature, *data, *blob; | |
1217 | u_int signaturelen, datalen, bloblen; | |
1218 | int verified = 0; | |
1219 | int valid_data = 0; | |
1220 | ||
1221 | blob = buffer_get_string(m, &bloblen); | |
1222 | signature = buffer_get_string(m, &signaturelen); | |
1223 | data = buffer_get_string(m, &datalen); | |
1224 | ||
1225 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1226 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1227 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1228 | |
1229 | key = key_from_blob(blob, bloblen); | |
1230 | if (key == NULL) | |
1588c277 | 1231 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1232 | |
1233 | switch (key_blobtype) { | |
1234 | case MM_USERKEY: | |
1235 | valid_data = monitor_valid_userblob(data, datalen); | |
1236 | break; | |
1237 | case MM_HOSTKEY: | |
1238 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1239 | hostbased_cuser, hostbased_chost); | |
1240 | break; | |
1241 | default: | |
1242 | valid_data = 0; | |
1243 | break; | |
1244 | } | |
1245 | if (!valid_data) | |
1588c277 | 1246 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1247 | |
1248 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1249 | debug3("%s: key %p signature %s", | |
89916e8c | 1250 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
1853d1ef | 1251 | |
1252 | key_free(key); | |
1253 | xfree(blob); | |
1254 | xfree(signature); | |
1255 | xfree(data); | |
1256 | ||
d17ef027 | 1257 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1258 | ||
1853d1ef | 1259 | monitor_reset_key_state(); |
1260 | ||
1261 | buffer_clear(m); | |
1262 | buffer_put_int(m, verified); | |
ca75d7de | 1263 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1264 | |
89916e8c | 1265 | return (verified == 1); |
1853d1ef | 1266 | } |
1267 | ||
1268 | static void | |
1269 | mm_record_login(Session *s, struct passwd *pw) | |
1270 | { | |
1271 | socklen_t fromlen; | |
1272 | struct sockaddr_storage from; | |
1273 | ||
1274 | /* | |
1275 | * Get IP address of client. If the connection is not a socket, let | |
1276 | * the address be 0.0.0.0. | |
1277 | */ | |
1278 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1279 | fromlen = sizeof(from); |
1853d1ef | 1280 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1281 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1282 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1283 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1284 | cleanup_exit(255); |
1853d1ef | 1285 | } |
1286 | } | |
1287 | /* Record that there was a login on that tty from the remote host. */ | |
1288 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1289 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1290 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1291 | } |
1292 | ||
1293 | static void | |
1294 | mm_session_close(Session *s) | |
1295 | { | |
b9ed513a | 1296 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1297 | if (s->ttyfd != -1) { |
c56969f9 | 1298 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1299 | session_pty_cleanup2(s); |
1300 | } | |
c6dca55e | 1301 | session_unused(s->self); |
1853d1ef | 1302 | } |
1303 | ||
1304 | int | |
ca75d7de | 1305 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1306 | { |
b5a28cbc | 1307 | extern struct monitor *pmonitor; |
1853d1ef | 1308 | Session *s; |
1309 | int res, fd0; | |
1310 | ||
1588c277 | 1311 | debug3("%s entering", __func__); |
1853d1ef | 1312 | |
1313 | buffer_clear(m); | |
1314 | s = session_new(); | |
1315 | if (s == NULL) | |
1316 | goto error; | |
1317 | s->authctxt = authctxt; | |
1318 | s->pw = authctxt->pw; | |
b5a28cbc | 1319 | s->pid = pmonitor->m_pid; |
1853d1ef | 1320 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1321 | if (res == 0) | |
1322 | goto error; | |
1853d1ef | 1323 | pty_setowner(authctxt->pw, s->tty); |
1324 | ||
1325 | buffer_put_int(m, 1); | |
1326 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1327 | |
1328 | /* We need to trick ttyslot */ | |
1329 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1330 | fatal("%s: dup2", __func__); |
1853d1ef | 1331 | |
1332 | mm_record_login(s, authctxt->pw); | |
1333 | ||
1334 | /* Now we can close the file descriptor again */ | |
1335 | close(0); | |
1336 | ||
be2ca0c9 | 1337 | /* send messages generated by record_login */ |
1338 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1339 | buffer_clear(&loginmsg); | |
1340 | ||
1341 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1342 | ||
8de7aaab | 1343 | if (mm_send_fd(sock, s->ptyfd) == -1 || |
1344 | mm_send_fd(sock, s->ttyfd) == -1) | |
1345 | fatal("%s: send fds failed", __func__); | |
be2ca0c9 | 1346 | |
1853d1ef | 1347 | /* make sure nothing uses fd 0 */ |
1348 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1349 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1350 | if (fd0 != 0) |
1588c277 | 1351 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1352 | |
1353 | /* slave is not needed */ | |
1354 | close(s->ttyfd); | |
1355 | s->ttyfd = s->ptyfd; | |
1356 | /* no need to dup() because nobody closes ptyfd */ | |
1357 | s->ptymaster = s->ptyfd; | |
1358 | ||
c56969f9 | 1359 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1360 | |
1361 | return (0); | |
1362 | ||
1363 | error: | |
1364 | if (s != NULL) | |
1365 | mm_session_close(s); | |
1366 | buffer_put_int(m, 0); | |
ca75d7de | 1367 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1368 | return (0); |
1369 | } | |
1370 | ||
1371 | int | |
ca75d7de | 1372 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1373 | { |
1374 | Session *s; | |
1375 | char *tty; | |
1376 | ||
1588c277 | 1377 | debug3("%s entering", __func__); |
1853d1ef | 1378 | |
1379 | tty = buffer_get_string(m, NULL); | |
1380 | if ((s = session_by_tty(tty)) != NULL) | |
1381 | mm_session_close(s); | |
1382 | buffer_clear(m); | |
1383 | xfree(tty); | |
1384 | return (0); | |
1385 | } | |
1386 | ||
1387 | int | |
ca75d7de | 1388 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1389 | { |
1390 | BIGNUM *p; | |
1391 | int rsafail; | |
1392 | ||
1393 | /* Turn off permissions */ | |
75cccc2c | 1394 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1395 | |
1396 | if ((p = BN_new()) == NULL) | |
1588c277 | 1397 | fatal("%s: BN_new", __func__); |
1853d1ef | 1398 | |
1399 | buffer_get_bignum2(m, p); | |
1400 | ||
1401 | rsafail = ssh1_session_key(p); | |
1402 | ||
1403 | buffer_clear(m); | |
1404 | buffer_put_int(m, rsafail); | |
1405 | buffer_put_bignum2(m, p); | |
1406 | ||
1407 | BN_clear_free(p); | |
1408 | ||
ca75d7de | 1409 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1410 | |
1411 | /* Turn on permissions for sessid passing */ | |
1412 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1413 | ||
1414 | return (0); | |
1415 | } | |
1416 | ||
1417 | int | |
ca75d7de | 1418 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1419 | { |
1420 | int i; | |
1421 | ||
1588c277 | 1422 | debug3("%s entering", __func__); |
1853d1ef | 1423 | |
1424 | if (buffer_len(m) != 16) | |
1588c277 | 1425 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1426 | for (i = 0; i < 16; i++) |
1427 | session_id[i] = buffer_get_char(m); | |
1428 | ||
1429 | /* Turn on permissions for getpwnam */ | |
1430 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1431 | ||
1432 | return (0); | |
1433 | } | |
1434 | ||
1435 | int | |
ca75d7de | 1436 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1437 | { |
1438 | BIGNUM *client_n; | |
1439 | Key *key = NULL; | |
1440 | u_char *blob = NULL; | |
1441 | u_int blen = 0; | |
1442 | int allowed = 0; | |
1443 | ||
1588c277 | 1444 | debug3("%s entering", __func__); |
1853d1ef | 1445 | |
c023a130 | 1446 | auth_method = "rsa"; |
aa586f8e | 1447 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1448 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1449 | fatal("%s: BN_new", __func__); |
1853d1ef | 1450 | buffer_get_bignum2(m, client_n); |
1451 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1452 | BN_clear_free(client_n); | |
1453 | } | |
1454 | buffer_clear(m); | |
1455 | buffer_put_int(m, allowed); | |
92e15201 | 1456 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1457 | |
1458 | /* clear temporarily storage (used by generate challenge) */ | |
1459 | monitor_reset_key_state(); | |
1460 | ||
1461 | if (allowed && key != NULL) { | |
1462 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1463 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1464 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1465 | buffer_put_string(m, blob, blen); |
1466 | ||
1467 | /* Save temporarily for comparison in verify */ | |
1468 | key_blob = blob; | |
1469 | key_bloblen = blen; | |
1470 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1471 | } |
3e2f2431 | 1472 | if (key != NULL) |
1473 | key_free(key); | |
1853d1ef | 1474 | |
1475 | mm_append_debug(m); | |
1476 | ||
ca75d7de | 1477 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1478 | |
1479 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1480 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1481 | return (0); | |
1482 | } | |
1483 | ||
1484 | int | |
ca75d7de | 1485 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1486 | { |
1487 | Key *key = NULL; | |
1488 | u_char *blob; | |
1489 | u_int blen; | |
1490 | ||
1588c277 | 1491 | debug3("%s entering", __func__); |
1853d1ef | 1492 | |
1493 | if (!authctxt->valid) | |
1588c277 | 1494 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1495 | blob = buffer_get_string(m, &blen); |
1496 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1497 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1498 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1499 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1500 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1501 | fatal("%s: received bad key", __func__); |
28b5d376 | 1502 | if (key->type != KEY_RSA) |
1503 | fatal("%s: received bad key type %d", __func__, key->type); | |
1504 | key->type = KEY_RSA1; | |
1853d1ef | 1505 | if (ssh1_challenge) |
1506 | BN_clear_free(ssh1_challenge); | |
1507 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1508 | ||
1509 | buffer_clear(m); | |
1510 | buffer_put_bignum2(m, ssh1_challenge); | |
1511 | ||
1588c277 | 1512 | debug3("%s sending reply", __func__); |
ca75d7de | 1513 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1514 | |
1515 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1516 | |
1517 | xfree(blob); | |
1518 | key_free(key); | |
1853d1ef | 1519 | return (0); |
1520 | } | |
1521 | ||
1522 | int | |
ca75d7de | 1523 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1524 | { |
1525 | Key *key = NULL; | |
1526 | u_char *blob, *response; | |
1527 | u_int blen, len; | |
1528 | int success; | |
1529 | ||
1588c277 | 1530 | debug3("%s entering", __func__); |
1853d1ef | 1531 | |
1532 | if (!authctxt->valid) | |
1588c277 | 1533 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1534 | if (ssh1_challenge == NULL) |
1588c277 | 1535 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1536 | |
1537 | blob = buffer_get_string(m, &blen); | |
1538 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1539 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1540 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1541 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1542 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1543 | fatal("%s: received bad key", __func__); |
1853d1ef | 1544 | response = buffer_get_string(m, &len); |
1545 | if (len != 16) | |
1588c277 | 1546 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1547 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1548 | ||
3e2f2431 | 1549 | xfree(blob); |
1853d1ef | 1550 | key_free(key); |
1551 | xfree(response); | |
1552 | ||
1553 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1554 | ||
1555 | /* reset state */ | |
1556 | BN_clear_free(ssh1_challenge); | |
1557 | ssh1_challenge = NULL; | |
1558 | monitor_reset_key_state(); | |
1559 | ||
1560 | buffer_clear(m); | |
1561 | buffer_put_int(m, success); | |
ca75d7de | 1562 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1563 | |
1564 | return (success); | |
1565 | } | |
1566 | ||
1567 | int | |
ca75d7de | 1568 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1569 | { |
b5a28cbc | 1570 | extern struct monitor *pmonitor; |
1853d1ef | 1571 | int res, status; |
1572 | ||
1588c277 | 1573 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1574 | |
1575 | /* The child is terminating */ | |
1576 | session_destroy_all(&mm_session_close); | |
1577 | ||
83fa7e8d | 1578 | #ifdef USE_PAM |
1579 | if (options.use_pam) | |
1580 | sshpam_cleanup(); | |
1581 | #endif | |
1582 | ||
b5a28cbc | 1583 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1584 | if (errno != EINTR) |
1585 | exit(1); | |
1853d1ef | 1586 | |
1587 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1588 | ||
1589 | /* Terminate process */ | |
f6be21a0 | 1590 | exit(res); |
1853d1ef | 1591 | } |
1592 | ||
6039eeef | 1593 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1594 | /* Report that an audit event occurred */ |
1595 | int | |
1596 | mm_answer_audit_event(int socket, Buffer *m) | |
1597 | { | |
1598 | ssh_audit_event_t event; | |
1599 | ||
1600 | debug3("%s entering", __func__); | |
1601 | ||
1602 | event = buffer_get_int(m); | |
c00e4d75 | 1603 | switch(event) { |
6039eeef | 1604 | case SSH_AUTH_FAIL_PUBKEY: |
1605 | case SSH_AUTH_FAIL_HOSTBASED: | |
1606 | case SSH_AUTH_FAIL_GSSAPI: | |
1607 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1608 | case SSH_LOGIN_ROOT_DENIED: | |
1609 | case SSH_CONNECTION_CLOSE: | |
1610 | case SSH_INVALID_USER: | |
c00e4d75 | 1611 | audit_event(event); |
1612 | break; | |
1613 | default: | |
1614 | fatal("Audit event type %d not permitted", event); | |
1615 | } | |
1616 | ||
1617 | return (0); | |
1618 | } | |
1619 | ||
1620 | int | |
1621 | mm_answer_audit_command(int socket, Buffer *m) | |
1622 | { | |
1623 | u_int len; | |
1624 | char *cmd; | |
1625 | ||
1626 | debug3("%s entering", __func__); | |
1627 | cmd = buffer_get_string(m, &len); | |
1628 | /* sanity check command, if so how? */ | |
1629 | audit_run_command(cmd); | |
1630 | xfree(cmd); | |
c00e4d75 | 1631 | return (0); |
1632 | } | |
6039eeef | 1633 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1634 | |
1853d1ef | 1635 | void |
b5a28cbc | 1636 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1637 | { |
1638 | if (compat20) { | |
1639 | set_newkeys(MODE_IN); | |
1640 | set_newkeys(MODE_OUT); | |
1641 | } else { | |
1853d1ef | 1642 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1643 | packet_set_encryption_key(child_state.ssh1key, |
1644 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1645 | xfree(child_state.ssh1key); | |
1853d1ef | 1646 | } |
1647 | ||
9459414c | 1648 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1649 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1650 | xfree(child_state.keyout); | |
1651 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1652 | xfree(child_state.keyin); | |
1653 | ||
1654 | if (!compat20) { | |
1655 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1656 | xfree(child_state.ivout); | |
1657 | packet_set_iv(MODE_IN, child_state.ivin); | |
1658 | xfree(child_state.ivin); | |
1659 | } | |
1660 | ||
1661 | memcpy(&incoming_stream, &child_state.incoming, | |
1662 | sizeof(incoming_stream)); | |
1663 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1664 | sizeof(outgoing_stream)); | |
1665 | ||
1666 | /* Update with new address */ | |
0496cf34 | 1667 | if (options.compression) |
1668 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1669 | |
1670 | /* Network I/O buffers */ | |
1671 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
dc1f1948 | 1672 | buffer_clear(packet_get_input()); |
1673 | buffer_append(packet_get_input(), child_state.input, child_state.ilen); | |
1853d1ef | 1674 | memset(child_state.input, 0, child_state.ilen); |
1675 | xfree(child_state.input); | |
1676 | ||
dc1f1948 | 1677 | buffer_clear(packet_get_output()); |
1678 | buffer_append(packet_get_output(), child_state.output, | |
1679 | child_state.olen); | |
1853d1ef | 1680 | memset(child_state.output, 0, child_state.olen); |
1681 | xfree(child_state.output); | |
1682 | } | |
1683 | ||
1684 | static Kex * | |
1685 | mm_get_kex(Buffer *m) | |
1686 | { | |
1687 | Kex *kex; | |
1688 | void *blob; | |
1689 | u_int bloblen; | |
1690 | ||
52e3daed | 1691 | kex = xcalloc(1, sizeof(*kex)); |
1853d1ef | 1692 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
521d606b | 1693 | if ((session_id2 == NULL) || |
1694 | (kex->session_id_len != session_id2_len) || | |
1695 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1696 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1697 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1698 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1699 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1700 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1701 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1702 | kex->server = 1; |
1703 | kex->hostkey_type = buffer_get_int(m); | |
1704 | kex->kex_type = buffer_get_int(m); | |
1705 | blob = buffer_get_string(m, &bloblen); | |
1706 | buffer_init(&kex->my); | |
1707 | buffer_append(&kex->my, blob, bloblen); | |
1708 | xfree(blob); | |
1709 | blob = buffer_get_string(m, &bloblen); | |
1710 | buffer_init(&kex->peer); | |
1711 | buffer_append(&kex->peer, blob, bloblen); | |
1712 | xfree(blob); | |
1713 | kex->done = 1; | |
1714 | kex->flags = buffer_get_int(m); | |
1715 | kex->client_version_string = buffer_get_string(m, NULL); | |
1716 | kex->server_version_string = buffer_get_string(m, NULL); | |
1717 | kex->load_host_key=&get_hostkey_by_type; | |
1718 | kex->host_key_index=&get_hostkey_index; | |
1719 | ||
1720 | return (kex); | |
1721 | } | |
1722 | ||
1723 | /* This function requries careful sanity checking */ | |
1724 | ||
1725 | void | |
b5a28cbc | 1726 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1727 | { |
1728 | Buffer m; | |
1729 | u_char *blob, *p; | |
1730 | u_int bloblen, plen; | |
ffd7b36b | 1731 | u_int32_t seqnr, packets; |
e8e08a80 | 1732 | u_int64_t blocks, bytes; |
1853d1ef | 1733 | |
1588c277 | 1734 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1735 | |
1736 | buffer_init(&m); | |
b5a28cbc | 1737 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1738 | if (!compat20) { |
1739 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1740 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1741 | child_state.ssh1key = buffer_get_string(&m, |
1742 | &child_state.ssh1keylen); | |
1853d1ef | 1743 | child_state.ivout = buffer_get_string(&m, |
1744 | &child_state.ivoutlen); | |
1745 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1746 | goto skip; | |
1747 | } else { | |
1748 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1749 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1750 | } |
1751 | ||
1752 | blob = buffer_get_string(&m, &bloblen); | |
1753 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1754 | xfree(blob); | |
1755 | ||
1588c277 | 1756 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1757 | blob = buffer_get_string(&m, &bloblen); |
1758 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1759 | xfree(blob); | |
1760 | ||
1761 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1762 | seqnr = buffer_get_int(&m); |
1763 | blocks = buffer_get_int64(&m); | |
1764 | packets = buffer_get_int(&m); | |
e8e08a80 | 1765 | bytes = buffer_get_int64(&m); |
1766 | packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); | |
ffd7b36b | 1767 | seqnr = buffer_get_int(&m); |
1768 | blocks = buffer_get_int64(&m); | |
1769 | packets = buffer_get_int(&m); | |
e8e08a80 | 1770 | bytes = buffer_get_int64(&m); |
1771 | packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); | |
1853d1ef | 1772 | |
1773 | skip: | |
1774 | /* Get the key context */ | |
1775 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1776 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1777 | ||
1588c277 | 1778 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1779 | /* Get compression state */ |
1780 | p = buffer_get_string(&m, &plen); | |
1781 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1782 | fatal("%s: bad request size", __func__); |
1853d1ef | 1783 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1784 | xfree(p); | |
1785 | ||
1786 | p = buffer_get_string(&m, &plen); | |
1787 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1788 | fatal("%s: bad request size", __func__); |
1853d1ef | 1789 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1790 | xfree(p); | |
1791 | ||
1792 | /* Network I/O buffers */ | |
1588c277 | 1793 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1794 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1795 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1796 | ||
1797 | buffer_free(&m); | |
1798 | } | |
1799 | ||
1800 | ||
1801 | /* Allocation functions for zlib */ | |
1802 | void * | |
1803 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1804 | { | |
39e71188 | 1805 | size_t len = (size_t) size * ncount; |
1853d1ef | 1806 | void *address; |
1807 | ||
b85698ab | 1808 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1809 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1810 | ||
1811 | address = mm_malloc(mm, len); | |
1853d1ef | 1812 | |
1813 | return (address); | |
1814 | } | |
1815 | ||
1816 | void | |
1817 | mm_zfree(struct mm_master *mm, void *address) | |
1818 | { | |
1819 | mm_free(mm, address); | |
1820 | } | |
1821 | ||
1822 | void | |
1823 | mm_init_compression(struct mm_master *mm) | |
1824 | { | |
1825 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1826 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1827 | outgoing_stream.opaque = mm; | |
1828 | ||
1829 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1830 | incoming_stream.zfree = (free_func)mm_zfree; | |
1831 | incoming_stream.opaque = mm; | |
1832 | } | |
1833 | ||
1834 | /* XXX */ | |
1835 | ||
1836 | #define FD_CLOSEONEXEC(x) do { \ | |
1837 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1838 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1839 | } while (0) | |
1840 | ||
1841 | static void | |
1842 | monitor_socketpair(int *pair) | |
1843 | { | |
f1af2dbf | 1844 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1845 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1846 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1847 | #else |
1848 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1849 | __func__); |
f1af2dbf | 1850 | #endif |
1853d1ef | 1851 | FD_CLOSEONEXEC(pair[0]); |
1852 | FD_CLOSEONEXEC(pair[1]); | |
1853 | } | |
1854 | ||
1855 | #define MM_MEMSIZE 65536 | |
1856 | ||
1857 | struct monitor * | |
1858 | monitor_init(void) | |
1859 | { | |
1860 | struct monitor *mon; | |
1861 | int pair[2]; | |
1862 | ||
52e3daed | 1863 | mon = xcalloc(1, sizeof(*mon)); |
1853d1ef | 1864 | |
1865 | monitor_socketpair(pair); | |
1866 | ||
1867 | mon->m_recvfd = pair[0]; | |
1868 | mon->m_sendfd = pair[1]; | |
1869 | ||
1870 | /* Used to share zlib space across processes */ | |
0496cf34 | 1871 | if (options.compression) { |
1872 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1873 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1874 | |
0496cf34 | 1875 | /* Compression needs to share state across borders */ |
1876 | mm_init_compression(mon->m_zlib); | |
1877 | } | |
1853d1ef | 1878 | |
1879 | return mon; | |
1880 | } | |
1881 | ||
1882 | void | |
1883 | monitor_reinit(struct monitor *mon) | |
1884 | { | |
1885 | int pair[2]; | |
1886 | ||
1887 | monitor_socketpair(pair); | |
1888 | ||
1889 | mon->m_recvfd = pair[0]; | |
1890 | mon->m_sendfd = pair[1]; | |
1891 | } | |
7364bd04 | 1892 | |
1893 | #ifdef GSSAPI | |
1894 | int | |
ca75d7de | 1895 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1896 | { |
ca75d7de | 1897 | gss_OID_desc goid; |
7364bd04 | 1898 | OM_uint32 major; |
1899 | u_int len; | |
1900 | ||
ca75d7de | 1901 | goid.elements = buffer_get_string(m, &len); |
1902 | goid.length = len; | |
7364bd04 | 1903 | |
ca75d7de | 1904 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1905 | |
ca75d7de | 1906 | xfree(goid.elements); |
7364bd04 | 1907 | |
1908 | buffer_clear(m); | |
1909 | buffer_put_int(m, major); | |
1910 | ||
8442cc66 | 1911 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1912 | |
1913 | /* Now we have a context, enable the step */ | |
1914 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1915 | ||
1916 | return (0); | |
1917 | } | |
1918 | ||
1919 | int | |
ca75d7de | 1920 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1921 | { |
1922 | gss_buffer_desc in; | |
1923 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1924 | OM_uint32 major, minor; |
7364bd04 | 1925 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1926 | u_int len; |
7364bd04 | 1927 | |
f99e1ca4 | 1928 | in.value = buffer_get_string(m, &len); |
1929 | in.length = len; | |
7364bd04 | 1930 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1931 | xfree(in.value); | |
1932 | ||
1933 | buffer_clear(m); | |
1934 | buffer_put_int(m, major); | |
1935 | buffer_put_string(m, out.value, out.length); | |
1936 | buffer_put_int(m, flags); | |
ca75d7de | 1937 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1938 | |
1939 | gss_release_buffer(&minor, &out); | |
1940 | ||
8442cc66 | 1941 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1942 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1943 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1944 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1945 | } |
1946 | return (0); | |
1947 | } | |
1948 | ||
0789992b | 1949 | int |
ca75d7de | 1950 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1951 | { |
1952 | gss_buffer_desc gssbuf, mic; | |
1953 | OM_uint32 ret; | |
1954 | u_int len; | |
b6453d99 | 1955 | |
0789992b | 1956 | gssbuf.value = buffer_get_string(m, &len); |
1957 | gssbuf.length = len; | |
1958 | mic.value = buffer_get_string(m, &len); | |
1959 | mic.length = len; | |
b6453d99 | 1960 | |
0789992b | 1961 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1962 | |
0789992b | 1963 | xfree(gssbuf.value); |
1964 | xfree(mic.value); | |
b6453d99 | 1965 | |
0789992b | 1966 | buffer_clear(m); |
1967 | buffer_put_int(m, ret); | |
b6453d99 | 1968 | |
ca75d7de | 1969 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1970 | |
0789992b | 1971 | if (!GSS_ERROR(ret)) |
1972 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1973 | |
0789992b | 1974 | return (0); |
1975 | } | |
1976 | ||
7364bd04 | 1977 | int |
ca75d7de | 1978 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1979 | { |
1980 | int authenticated; | |
1981 | ||
1982 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1983 | ||
1984 | buffer_clear(m); | |
1985 | buffer_put_int(m, authenticated); | |
1986 | ||
1987 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1988 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1989 | |
8442cc66 | 1990 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1991 | |
1992 | /* Monitor loop will terminate if authenticated */ | |
1993 | return (authenticated); | |
1994 | } | |
1995 | #endif /* GSSAPI */ | |
5adf6b9a | 1996 | |
1997 | #ifdef JPAKE | |
1998 | int | |
1999 | mm_answer_jpake_step1(int sock, Buffer *m) | |
2000 | { | |
2001 | struct jpake_ctx *pctx; | |
2002 | u_char *x3_proof, *x4_proof; | |
2003 | u_int x3_proof_len, x4_proof_len; | |
2004 | ||
2005 | if (!options.zero_knowledge_password_authentication) | |
2006 | fatal("zero_knowledge_password_authentication disabled"); | |
2007 | ||
2008 | if (authctxt->jpake_ctx != NULL) | |
2009 | fatal("%s: authctxt->jpake_ctx already set (%p)", | |
2010 | __func__, authctxt->jpake_ctx); | |
2011 | authctxt->jpake_ctx = pctx = jpake_new(); | |
2012 | ||
2013 | jpake_step1(pctx->grp, | |
2014 | &pctx->server_id, &pctx->server_id_len, | |
2015 | &pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4, | |
2016 | &x3_proof, &x3_proof_len, | |
2017 | &x4_proof, &x4_proof_len); | |
2018 | ||
2019 | JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__)); | |
2020 | ||
2021 | buffer_clear(m); | |
2022 | ||
2023 | buffer_put_string(m, pctx->server_id, pctx->server_id_len); | |
2024 | buffer_put_bignum2(m, pctx->g_x3); | |
2025 | buffer_put_bignum2(m, pctx->g_x4); | |
2026 | buffer_put_string(m, x3_proof, x3_proof_len); | |
2027 | buffer_put_string(m, x4_proof, x4_proof_len); | |
2028 | ||
2029 | debug3("%s: sending step1", __func__); | |
2030 | mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m); | |
2031 | ||
2032 | bzero(x3_proof, x3_proof_len); | |
2033 | bzero(x4_proof, x4_proof_len); | |
2034 | xfree(x3_proof); | |
2035 | xfree(x4_proof); | |
2036 | ||
2037 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1); | |
2038 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0); | |
2039 | ||
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | int | |
2044 | mm_answer_jpake_get_pwdata(int sock, Buffer *m) | |
2045 | { | |
2046 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2047 | char *hash_scheme, *salt; | |
2048 | ||
2049 | if (pctx == NULL) | |
2050 | fatal("%s: pctx == NULL", __func__); | |
2051 | ||
2052 | auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt); | |
2053 | ||
2054 | buffer_clear(m); | |
2055 | /* pctx->s is sensitive, not returned to slave */ | |
2056 | buffer_put_cstring(m, hash_scheme); | |
2057 | buffer_put_cstring(m, salt); | |
2058 | ||
2059 | debug3("%s: sending pwdata", __func__); | |
2060 | mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m); | |
2061 | ||
2062 | bzero(hash_scheme, strlen(hash_scheme)); | |
2063 | bzero(salt, strlen(salt)); | |
2064 | xfree(hash_scheme); | |
2065 | xfree(salt); | |
2066 | ||
2067 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1); | |
2068 | ||
2069 | return 0; | |
2070 | } | |
2071 | ||
2072 | int | |
2073 | mm_answer_jpake_step2(int sock, Buffer *m) | |
2074 | { | |
2075 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2076 | u_char *x1_proof, *x2_proof, *x4_s_proof; | |
2077 | u_int x1_proof_len, x2_proof_len, x4_s_proof_len; | |
2078 | ||
2079 | if (pctx == NULL) | |
2080 | fatal("%s: pctx == NULL", __func__); | |
2081 | ||
2082 | if ((pctx->g_x1 = BN_new()) == NULL || | |
2083 | (pctx->g_x2 = BN_new()) == NULL) | |
2084 | fatal("%s: BN_new", __func__); | |
2085 | buffer_get_bignum2(m, pctx->g_x1); | |
2086 | buffer_get_bignum2(m, pctx->g_x2); | |
2087 | pctx->client_id = buffer_get_string(m, &pctx->client_id_len); | |
2088 | x1_proof = buffer_get_string(m, &x1_proof_len); | |
2089 | x2_proof = buffer_get_string(m, &x2_proof_len); | |
2090 | ||
2091 | jpake_step2(pctx->grp, pctx->s, pctx->g_x3, | |
2092 | pctx->g_x1, pctx->g_x2, pctx->x4, | |
2093 | pctx->client_id, pctx->client_id_len, | |
2094 | pctx->server_id, pctx->server_id_len, | |
2095 | x1_proof, x1_proof_len, | |
2096 | x2_proof, x2_proof_len, | |
2097 | &pctx->b, | |
2098 | &x4_s_proof, &x4_s_proof_len); | |
2099 | ||
2100 | JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__)); | |
2101 | ||
2102 | bzero(x1_proof, x1_proof_len); | |
2103 | bzero(x2_proof, x2_proof_len); | |
2104 | xfree(x1_proof); | |
2105 | xfree(x2_proof); | |
2106 | ||
2107 | buffer_clear(m); | |
2108 | ||
2109 | buffer_put_bignum2(m, pctx->b); | |
2110 | buffer_put_string(m, x4_s_proof, x4_s_proof_len); | |
2111 | ||
2112 | debug3("%s: sending step2", __func__); | |
2113 | mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m); | |
2114 | ||
2115 | bzero(x4_s_proof, x4_s_proof_len); | |
2116 | xfree(x4_s_proof); | |
2117 | ||
2118 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1); | |
2119 | ||
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | int | |
2124 | mm_answer_jpake_key_confirm(int sock, Buffer *m) | |
2125 | { | |
2126 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2127 | u_char *x2_s_proof; | |
2128 | u_int x2_s_proof_len; | |
2129 | ||
2130 | if (pctx == NULL) | |
2131 | fatal("%s: pctx == NULL", __func__); | |
2132 | ||
2133 | if ((pctx->a = BN_new()) == NULL) | |
2134 | fatal("%s: BN_new", __func__); | |
2135 | buffer_get_bignum2(m, pctx->a); | |
2136 | x2_s_proof = buffer_get_string(m, &x2_s_proof_len); | |
2137 | ||
2138 | jpake_key_confirm(pctx->grp, pctx->s, pctx->a, | |
2139 | pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2, | |
2140 | pctx->server_id, pctx->server_id_len, | |
2141 | pctx->client_id, pctx->client_id_len, | |
2142 | session_id2, session_id2_len, | |
2143 | x2_s_proof, x2_s_proof_len, | |
2144 | &pctx->k, | |
2145 | &pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len); | |
2146 | ||
2147 | JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__)); | |
2148 | ||
2149 | bzero(x2_s_proof, x2_s_proof_len); | |
2150 | buffer_clear(m); | |
2151 | ||
2152 | /* pctx->k is sensitive, not sent */ | |
2153 | buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len); | |
2154 | ||
2155 | debug3("%s: sending confirmation hash", __func__); | |
2156 | mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m); | |
2157 | ||
2158 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1); | |
2159 | ||
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | int | |
2164 | mm_answer_jpake_check_confirm(int sock, Buffer *m) | |
2165 | { | |
2166 | int authenticated = 0; | |
2167 | u_char *peer_confirm_hash; | |
2168 | u_int peer_confirm_hash_len; | |
2169 | struct jpake_ctx *pctx = authctxt->jpake_ctx; | |
2170 | ||
2171 | if (pctx == NULL) | |
2172 | fatal("%s: pctx == NULL", __func__); | |
2173 | ||
2174 | peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len); | |
2175 | ||
2176 | authenticated = jpake_check_confirm(pctx->k, | |
2177 | pctx->client_id, pctx->client_id_len, | |
2178 | session_id2, session_id2_len, | |
2179 | peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid; | |
2180 | ||
2181 | JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__)); | |
2182 | ||
2183 | bzero(peer_confirm_hash, peer_confirm_hash_len); | |
2184 | xfree(peer_confirm_hash); | |
2185 | ||
2186 | buffer_clear(m); | |
2187 | buffer_put_int(m, authenticated); | |
2188 | ||
2189 | debug3("%s: sending result %d", __func__, authenticated); | |
2190 | mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m); | |
2191 | ||
2192 | monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1); | |
2193 | ||
2194 | auth_method = "jpake-01@openssh.com"; | |
2195 | return authenticated; | |
2196 | } | |
2197 | ||
2198 | #endif /* JPAKE */ |