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28b5d376 | 1 | /* $OpenBSD: monitor.c,v 1.101 2009/02/12 03:26:22 djm 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[]; | |
103 | extern Buffer input, output; | |
104 | extern Buffer auth_debug; | |
105 | extern int auth_debug_init; | |
be2ca0c9 | 106 | extern Buffer loginmsg; |
1853d1ef | 107 | |
108 | /* State exported from the child */ | |
109 | ||
110 | struct { | |
111 | z_stream incoming; | |
112 | z_stream outgoing; | |
113 | u_char *keyin; | |
114 | u_int keyinlen; | |
115 | u_char *keyout; | |
116 | u_int keyoutlen; | |
117 | u_char *ivin; | |
118 | u_int ivinlen; | |
119 | u_char *ivout; | |
120 | u_int ivoutlen; | |
9459414c | 121 | u_char *ssh1key; |
122 | u_int ssh1keylen; | |
1853d1ef | 123 | int ssh1cipher; |
124 | int ssh1protoflags; | |
125 | u_char *input; | |
126 | u_int ilen; | |
127 | u_char *output; | |
128 | u_int olen; | |
129 | } child_state; | |
130 | ||
b8e04133 | 131 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 132 | |
133 | int mm_answer_moduli(int, Buffer *); | |
134 | int mm_answer_sign(int, Buffer *); | |
135 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 136 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 137 | int mm_answer_authserv(int, Buffer *); |
138 | int mm_answer_authpassword(int, Buffer *); | |
139 | int mm_answer_bsdauthquery(int, Buffer *); | |
140 | int mm_answer_bsdauthrespond(int, Buffer *); | |
141 | int mm_answer_skeyquery(int, Buffer *); | |
142 | int mm_answer_skeyrespond(int, Buffer *); | |
143 | int mm_answer_keyallowed(int, Buffer *); | |
144 | int mm_answer_keyverify(int, Buffer *); | |
145 | int mm_answer_pty(int, Buffer *); | |
146 | int mm_answer_pty_cleanup(int, Buffer *); | |
147 | int mm_answer_term(int, Buffer *); | |
148 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
149 | int mm_answer_rsa_challenge(int, Buffer *); | |
150 | int mm_answer_rsa_response(int, Buffer *); | |
151 | int mm_answer_sesskey(int, Buffer *); | |
152 | int mm_answer_sessid(int, Buffer *); | |
5adf6b9a | 153 | int mm_answer_jpake_get_pwdata(int, Buffer *); |
154 | int mm_answer_jpake_step1(int, Buffer *); | |
155 | int mm_answer_jpake_step2(int, Buffer *); | |
156 | int mm_answer_jpake_key_confirm(int, Buffer *); | |
157 | int mm_answer_jpake_check_confirm(int, Buffer *); | |
1853d1ef | 158 | |
ad200abb | 159 | #ifdef USE_PAM |
160 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 161 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 162 | int mm_answer_pam_init_ctx(int, Buffer *); |
163 | int mm_answer_pam_query(int, Buffer *); | |
164 | int mm_answer_pam_respond(int, Buffer *); | |
165 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 166 | #endif |
167 | ||
7364bd04 | 168 | #ifdef GSSAPI |
169 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
170 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
171 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 172 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 173 | #endif |
696f6bef | 174 | |
6039eeef | 175 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 176 | int mm_answer_audit_event(int, Buffer *); |
177 | int mm_answer_audit_command(int, Buffer *); | |
178 | #endif | |
179 | ||
1853d1ef | 180 | static Authctxt *authctxt; |
181 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
182 | ||
183 | /* local state for key verify */ | |
184 | static u_char *key_blob = NULL; | |
185 | static u_int key_bloblen = 0; | |
186 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 187 | static char *hostbased_cuser = NULL; |
188 | static char *hostbased_chost = NULL; | |
1853d1ef | 189 | static char *auth_method = "unknown"; |
a27002e5 | 190 | static u_int session_id2_len = 0; |
521d606b | 191 | static u_char *session_id2 = NULL; |
3a39206f | 192 | static pid_t monitor_child_pid; |
1853d1ef | 193 | |
194 | struct mon_table { | |
195 | enum monitor_reqtype type; | |
196 | int flags; | |
197 | int (*f)(int, Buffer *); | |
198 | }; | |
199 | ||
200 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
201 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
202 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
c023a130 | 203 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
1853d1ef | 204 | |
205 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
206 | ||
207 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
208 | ||
209 | struct mon_table mon_dispatch_proto20[] = { | |
210 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
211 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
212 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
213 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 214 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 215 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 216 | #ifdef USE_PAM |
217 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 218 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 219 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
220 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
221 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
222 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 223 | #endif |
6039eeef | 224 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 225 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 226 | #endif |
1853d1ef | 227 | #ifdef BSD_AUTH |
228 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 229 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 230 | #endif |
231 | #ifdef SKEY | |
232 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
233 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
234 | #endif | |
235 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
236 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 237 | #ifdef GSSAPI |
238 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
239 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
240 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 241 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
5adf6b9a | 242 | #endif |
243 | #ifdef JPAKE | |
244 | {MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata}, | |
245 | {MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1}, | |
246 | {MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2}, | |
247 | {MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm}, | |
248 | {MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm}, | |
802e01b8 | 249 | #endif |
1853d1ef | 250 | {0, 0, NULL} |
251 | }; | |
252 | ||
253 | struct mon_table mon_dispatch_postauth20[] = { | |
254 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
255 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
256 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
257 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
258 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 259 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 260 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
261 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
262 | #endif | |
1853d1ef | 263 | {0, 0, NULL} |
264 | }; | |
265 | ||
266 | struct mon_table mon_dispatch_proto15[] = { | |
267 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
268 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
269 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
270 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
c023a130 | 271 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
272 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
1853d1ef | 273 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
274 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
275 | #ifdef BSD_AUTH | |
276 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 277 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 278 | #endif |
279 | #ifdef SKEY | |
280 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
281 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 282 | #endif |
283 | #ifdef USE_PAM | |
284 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 285 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 286 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
287 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
288 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
289 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 290 | #endif |
6039eeef | 291 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 292 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 293 | #endif |
294 | {0, 0, NULL} | |
295 | }; | |
296 | ||
297 | struct mon_table mon_dispatch_postauth15[] = { | |
298 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
299 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
300 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 301 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 302 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
bb09a477 | 303 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 304 | #endif |
1853d1ef | 305 | {0, 0, NULL} |
306 | }; | |
307 | ||
308 | struct mon_table *mon_dispatch; | |
309 | ||
310 | /* Specifies if a certain message is allowed at the moment */ | |
311 | ||
312 | static void | |
313 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
314 | { | |
315 | while (ent->f != NULL) { | |
316 | if (ent->type == type) { | |
317 | ent->flags &= ~MON_PERMIT; | |
318 | ent->flags |= permit ? MON_PERMIT : 0; | |
319 | return; | |
320 | } | |
321 | ent++; | |
322 | } | |
323 | } | |
324 | ||
325 | static void | |
326 | monitor_permit_authentications(int permit) | |
327 | { | |
328 | struct mon_table *ent = mon_dispatch; | |
329 | ||
330 | while (ent->f != NULL) { | |
331 | if (ent->flags & MON_AUTH) { | |
332 | ent->flags &= ~MON_PERMIT; | |
333 | ent->flags |= permit ? MON_PERMIT : 0; | |
334 | } | |
335 | ent++; | |
336 | } | |
337 | } | |
338 | ||
2362db19 | 339 | void |
340 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 341 | { |
342 | struct mon_table *ent; | |
343 | int authenticated = 0; | |
344 | ||
345 | debug3("preauth child monitor started"); | |
346 | ||
2362db19 | 347 | authctxt = _authctxt; |
348 | memset(authctxt, 0, sizeof(*authctxt)); | |
349 | ||
e05df884 | 350 | authctxt->loginmsg = &loginmsg; |
351 | ||
1853d1ef | 352 | if (compat20) { |
353 | mon_dispatch = mon_dispatch_proto20; | |
354 | ||
355 | /* Permit requests for moduli and signatures */ | |
356 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
357 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
358 | } else { | |
359 | mon_dispatch = mon_dispatch_proto15; | |
360 | ||
361 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
362 | } | |
363 | ||
1853d1ef | 364 | /* The first few requests do not require asynchronous access */ |
365 | while (!authenticated) { | |
c023a130 | 366 | auth_method = "unknown"; |
89916e8c | 367 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); |
1853d1ef | 368 | if (authenticated) { |
369 | if (!(ent->flags & MON_AUTHDECIDE)) | |
370 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 371 | __func__, ent->type); |
1853d1ef | 372 | if (authctxt->pw->pw_uid == 0 && |
373 | !auth_root_allowed(auth_method)) | |
374 | authenticated = 0; | |
5b9e2464 | 375 | #ifdef USE_PAM |
376 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 377 | if (options.use_pam && authenticated) { |
5b9e2464 | 378 | Buffer m; |
379 | ||
380 | buffer_init(&m); | |
aff51935 | 381 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 382 | MONITOR_REQ_PAM_ACCOUNT, &m); |
383 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
384 | buffer_free(&m); | |
385 | } | |
386 | #endif | |
1853d1ef | 387 | } |
388 | ||
c023a130 | 389 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
1853d1ef | 390 | auth_log(authctxt, authenticated, auth_method, |
391 | compat20 ? " ssh2" : ""); | |
392 | if (!authenticated) | |
393 | authctxt->failures++; | |
394 | } | |
5adf6b9a | 395 | #ifdef JPAKE |
396 | /* Cleanup JPAKE context after authentication */ | |
397 | if (ent->flags & MON_AUTHDECIDE) { | |
398 | if (authctxt->jpake_ctx != NULL) { | |
399 | jpake_free(authctxt->jpake_ctx); | |
400 | authctxt->jpake_ctx = NULL; | |
401 | } | |
402 | } | |
403 | #endif | |
1853d1ef | 404 | } |
405 | ||
406 | if (!authctxt->valid) | |
1588c277 | 407 | fatal("%s: authenticated invalid user", __func__); |
c023a130 | 408 | if (strcmp(auth_method, "unknown") == 0) |
409 | fatal("%s: authentication method name unknown", __func__); | |
1853d1ef | 410 | |
411 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 412 | __func__, authctxt->user); |
1853d1ef | 413 | |
b5a28cbc | 414 | mm_get_keystate(pmonitor); |
1853d1ef | 415 | } |
416 | ||
3a39206f | 417 | static void |
418 | monitor_set_child_handler(pid_t pid) | |
419 | { | |
420 | monitor_child_pid = pid; | |
421 | } | |
422 | ||
423 | static void | |
ca75d7de | 424 | monitor_child_handler(int sig) |
3a39206f | 425 | { |
ca75d7de | 426 | kill(monitor_child_pid, sig); |
3a39206f | 427 | } |
428 | ||
1853d1ef | 429 | void |
b5a28cbc | 430 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 431 | { |
3a39206f | 432 | monitor_set_child_handler(pmonitor->m_pid); |
433 | signal(SIGHUP, &monitor_child_handler); | |
434 | signal(SIGTERM, &monitor_child_handler); | |
21cd42db | 435 | signal(SIGINT, &monitor_child_handler); |
3a39206f | 436 | |
1853d1ef | 437 | if (compat20) { |
438 | mon_dispatch = mon_dispatch_postauth20; | |
439 | ||
440 | /* Permit requests for moduli and signatures */ | |
441 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
442 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
443 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 444 | } else { |
445 | mon_dispatch = mon_dispatch_postauth15; | |
446 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
447 | } | |
448 | if (!no_pty_flag) { | |
449 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
450 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
451 | } | |
452 | ||
453 | for (;;) | |
b5a28cbc | 454 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 455 | } |
456 | ||
457 | void | |
b5a28cbc | 458 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 459 | { |
0496cf34 | 460 | if (options.compression) { |
461 | /* The member allocation is not visible, so sync it */ | |
462 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
463 | } | |
1853d1ef | 464 | } |
465 | ||
466 | int | |
b5a28cbc | 467 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 468 | struct mon_table **pent) |
469 | { | |
470 | Buffer m; | |
471 | int ret; | |
472 | u_char type; | |
473 | ||
474 | buffer_init(&m); | |
475 | ||
b5a28cbc | 476 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 477 | type = buffer_get_char(&m); |
478 | ||
1588c277 | 479 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 480 | |
481 | while (ent->f != NULL) { | |
482 | if (ent->type == type) | |
483 | break; | |
484 | ent++; | |
485 | } | |
486 | ||
487 | if (ent->f != NULL) { | |
488 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 489 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 490 | type); |
b5a28cbc | 491 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 492 | buffer_free(&m); |
493 | ||
494 | /* The child may use this request only once, disable it */ | |
495 | if (ent->flags & MON_ONCE) { | |
1588c277 | 496 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 497 | type); |
498 | ent->flags &= ~MON_PERMIT; | |
499 | } | |
500 | ||
501 | if (pent != NULL) | |
502 | *pent = ent; | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
1588c277 | 507 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 508 | |
509 | /* NOTREACHED */ | |
510 | return (-1); | |
511 | } | |
512 | ||
513 | /* allowed key state */ | |
514 | static int | |
515 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
516 | { | |
517 | /* make sure key is allowed */ | |
518 | if (key_blob == NULL || key_bloblen != bloblen || | |
519 | memcmp(key_blob, blob, key_bloblen)) | |
520 | return (0); | |
521 | return (1); | |
522 | } | |
523 | ||
524 | static void | |
525 | monitor_reset_key_state(void) | |
526 | { | |
527 | /* reset state */ | |
528 | if (key_blob != NULL) | |
529 | xfree(key_blob); | |
530 | if (hostbased_cuser != NULL) | |
531 | xfree(hostbased_cuser); | |
532 | if (hostbased_chost != NULL) | |
533 | xfree(hostbased_chost); | |
534 | key_blob = NULL; | |
535 | key_bloblen = 0; | |
536 | key_blobtype = MM_NOKEY; | |
537 | hostbased_cuser = NULL; | |
538 | hostbased_chost = NULL; | |
539 | } | |
540 | ||
541 | int | |
ca75d7de | 542 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 543 | { |
544 | DH *dh; | |
545 | int min, want, max; | |
546 | ||
547 | min = buffer_get_int(m); | |
548 | want = buffer_get_int(m); | |
549 | max = buffer_get_int(m); | |
550 | ||
551 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 552 | __func__, min, want, max); |
1853d1ef | 553 | /* We need to check here, too, in case the child got corrupted */ |
554 | if (max < min || want < min || max < want) | |
555 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 556 | __func__, min, want, max); |
1853d1ef | 557 | |
558 | buffer_clear(m); | |
559 | ||
560 | dh = choose_dh(min, want, max); | |
561 | if (dh == NULL) { | |
562 | buffer_put_char(m, 0); | |
563 | return (0); | |
564 | } else { | |
565 | /* Send first bignum */ | |
566 | buffer_put_char(m, 1); | |
567 | buffer_put_bignum2(m, dh->p); | |
568 | buffer_put_bignum2(m, dh->g); | |
569 | ||
570 | DH_free(dh); | |
571 | } | |
ca75d7de | 572 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 573 | return (0); |
574 | } | |
575 | ||
576 | int | |
ca75d7de | 577 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 578 | { |
579 | Key *key; | |
580 | u_char *p; | |
581 | u_char *signature; | |
582 | u_int siglen, datlen; | |
583 | int keyid; | |
584 | ||
1588c277 | 585 | debug3("%s", __func__); |
1853d1ef | 586 | |
587 | keyid = buffer_get_int(m); | |
588 | p = buffer_get_string(m, &datlen); | |
589 | ||
2ff8003a | 590 | /* |
b4bbf172 | 591 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 592 | * SHA256 (32 byte) hashes |
593 | */ | |
594 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 595 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 596 | |
521d606b | 597 | /* save session id, it will be passed on the first call */ |
598 | if (session_id2_len == 0) { | |
599 | session_id2_len = datlen; | |
600 | session_id2 = xmalloc(session_id2_len); | |
601 | memcpy(session_id2, p, session_id2_len); | |
602 | } | |
603 | ||
1853d1ef | 604 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 605 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 606 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 607 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 608 | |
d1ff09ba | 609 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 610 | |
611 | buffer_clear(m); | |
612 | buffer_put_string(m, signature, siglen); | |
613 | ||
614 | xfree(p); | |
615 | xfree(signature); | |
616 | ||
ca75d7de | 617 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 618 | |
619 | /* Turn on permissions for getpwnam */ | |
620 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
621 | ||
622 | return (0); | |
623 | } | |
624 | ||
625 | /* Retrieves the password entry and also checks if the user is permitted */ | |
626 | ||
627 | int | |
ca75d7de | 628 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 629 | { |
18a8f313 | 630 | char *username; |
1853d1ef | 631 | struct passwd *pwent; |
632 | int allowed = 0; | |
633 | ||
1588c277 | 634 | debug3("%s", __func__); |
1853d1ef | 635 | |
636 | if (authctxt->attempt++ != 0) | |
1588c277 | 637 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 638 | |
18a8f313 | 639 | username = buffer_get_string(m, NULL); |
1853d1ef | 640 | |
18a8f313 | 641 | pwent = getpwnamallow(username); |
1853d1ef | 642 | |
18a8f313 | 643 | authctxt->user = xstrdup(username); |
644 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
645 | xfree(username); | |
1853d1ef | 646 | |
647 | buffer_clear(m); | |
648 | ||
649 | if (pwent == NULL) { | |
650 | buffer_put_char(m, 0); | |
b2a5802b | 651 | authctxt->pw = fakepw(); |
1853d1ef | 652 | goto out; |
653 | } | |
654 | ||
655 | allowed = 1; | |
656 | authctxt->pw = pwent; | |
657 | authctxt->valid = 1; | |
658 | ||
659 | buffer_put_char(m, 1); | |
660 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
661 | buffer_put_cstring(m, pwent->pw_name); | |
662 | buffer_put_cstring(m, "*"); | |
663 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 664 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 665 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 666 | #endif |
1853d1ef | 667 | buffer_put_cstring(m, pwent->pw_dir); |
668 | buffer_put_cstring(m, pwent->pw_shell); | |
dc0cae51 | 669 | |
670 | out: | |
03bcbf84 | 671 | buffer_put_string(m, &options, sizeof(options)); |
672 | if (options.banner != NULL) | |
673 | buffer_put_cstring(m, options.banner); | |
1588c277 | 674 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 675 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 676 | |
677 | /* For SSHv1 allow authentication now */ | |
678 | if (!compat20) | |
679 | monitor_permit_authentications(1); | |
94a73cdc | 680 | else { |
1853d1ef | 681 | /* Allow service/style information on the auth context */ |
682 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 683 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
684 | } | |
1853d1ef | 685 | |
efe44db6 | 686 | #ifdef USE_PAM |
7fceb20d | 687 | if (options.use_pam) |
688 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 689 | #endif |
1853d1ef | 690 | |
691 | return (0); | |
692 | } | |
693 | ||
ca75d7de | 694 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 695 | { |
696 | char *banner; | |
697 | ||
698 | buffer_clear(m); | |
699 | banner = auth2_read_banner(); | |
700 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 701 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 702 | |
703 | if (banner != NULL) | |
30e37ee6 | 704 | xfree(banner); |
94a73cdc | 705 | |
706 | return (0); | |
707 | } | |
708 | ||
1853d1ef | 709 | int |
ca75d7de | 710 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 711 | { |
712 | monitor_permit_authentications(1); | |
713 | ||
714 | authctxt->service = buffer_get_string(m, NULL); | |
715 | authctxt->style = buffer_get_string(m, NULL); | |
716 | debug3("%s: service=%s, style=%s", | |
1588c277 | 717 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 718 | |
719 | if (strlen(authctxt->style) == 0) { | |
720 | xfree(authctxt->style); | |
721 | authctxt->style = NULL; | |
722 | } | |
723 | ||
724 | return (0); | |
725 | } | |
726 | ||
727 | int | |
ca75d7de | 728 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 729 | { |
730 | static int call_count; | |
731 | char *passwd; | |
d341742a | 732 | int authenticated; |
733 | u_int plen; | |
1853d1ef | 734 | |
735 | passwd = buffer_get_string(m, &plen); | |
736 | /* Only authenticate if the context is valid */ | |
aa586f8e | 737 | authenticated = options.password_authentication && |
96d0bf74 | 738 | auth_password(authctxt, passwd); |
1853d1ef | 739 | memset(passwd, 0, strlen(passwd)); |
740 | xfree(passwd); | |
741 | ||
742 | buffer_clear(m); | |
743 | buffer_put_int(m, authenticated); | |
744 | ||
1588c277 | 745 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 746 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 747 | |
748 | call_count++; | |
749 | if (plen == 0 && call_count == 1) | |
750 | auth_method = "none"; | |
751 | else | |
752 | auth_method = "password"; | |
753 | ||
754 | /* Causes monitor loop to terminate if authenticated */ | |
755 | return (authenticated); | |
756 | } | |
757 | ||
758 | #ifdef BSD_AUTH | |
759 | int | |
ca75d7de | 760 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 761 | { |
762 | char *name, *infotxt; | |
763 | u_int numprompts; | |
764 | u_int *echo_on; | |
765 | char **prompts; | |
6d6c25e3 | 766 | u_int success; |
1853d1ef | 767 | |
6d6c25e3 | 768 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
769 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 770 | |
771 | buffer_clear(m); | |
6d6c25e3 | 772 | buffer_put_int(m, success); |
773 | if (success) | |
1853d1ef | 774 | buffer_put_cstring(m, prompts[0]); |
775 | ||
6d6c25e3 | 776 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 777 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 778 | |
6d6c25e3 | 779 | if (success) { |
1853d1ef | 780 | xfree(name); |
781 | xfree(infotxt); | |
782 | xfree(prompts); | |
783 | xfree(echo_on); | |
784 | } | |
785 | ||
786 | return (0); | |
787 | } | |
788 | ||
789 | int | |
ca75d7de | 790 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 791 | { |
792 | char *response; | |
793 | int authok; | |
794 | ||
795 | if (authctxt->as == 0) | |
1588c277 | 796 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 797 | |
798 | response = buffer_get_string(m, NULL); | |
aa586f8e | 799 | authok = options.challenge_response_authentication && |
800 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 801 | authctxt->as = NULL; |
1588c277 | 802 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 803 | xfree(response); |
804 | ||
805 | buffer_clear(m); | |
806 | buffer_put_int(m, authok); | |
807 | ||
1588c277 | 808 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 809 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 810 | |
811 | auth_method = "bsdauth"; | |
812 | ||
813 | return (authok != 0); | |
814 | } | |
815 | #endif | |
816 | ||
817 | #ifdef SKEY | |
818 | int | |
ca75d7de | 819 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 820 | { |
821 | struct skey skey; | |
822 | char challenge[1024]; | |
6d6c25e3 | 823 | u_int success; |
1853d1ef | 824 | |
f2b7b5c8 | 825 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
826 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 827 | |
828 | buffer_clear(m); | |
6d6c25e3 | 829 | buffer_put_int(m, success); |
830 | if (success) | |
1853d1ef | 831 | buffer_put_cstring(m, challenge); |
832 | ||
6d6c25e3 | 833 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 834 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 835 | |
836 | return (0); | |
837 | } | |
838 | ||
839 | int | |
ca75d7de | 840 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 841 | { |
842 | char *response; | |
843 | int authok; | |
844 | ||
845 | response = buffer_get_string(m, NULL); | |
846 | ||
aa586f8e | 847 | authok = (options.challenge_response_authentication && |
848 | authctxt->valid && | |
1853d1ef | 849 | skey_haskey(authctxt->pw->pw_name) == 0 && |
850 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
851 | ||
852 | xfree(response); | |
853 | ||
854 | buffer_clear(m); | |
855 | buffer_put_int(m, authok); | |
856 | ||
1588c277 | 857 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 858 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 859 | |
860 | auth_method = "skey"; | |
861 | ||
862 | return (authok != 0); | |
863 | } | |
864 | #endif | |
865 | ||
ad200abb | 866 | #ifdef USE_PAM |
867 | int | |
8b3ec5fd | 868 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 869 | { |
7fceb20d | 870 | if (!options.use_pam) |
871 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
872 | ||
529d73ab | 873 | start_pam(authctxt); |
ad200abb | 874 | |
5b9e2464 | 875 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
876 | ||
ad200abb | 877 | return (0); |
878 | } | |
05114c74 | 879 | |
5b9e2464 | 880 | int |
8b3ec5fd | 881 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 882 | { |
883 | u_int ret; | |
b6453d99 | 884 | |
5b9e2464 | 885 | if (!options.use_pam) |
886 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
887 | ||
888 | ret = do_pam_account(); | |
889 | ||
890 | buffer_put_int(m, ret); | |
cfb60d3a | 891 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 892 | |
8b3ec5fd | 893 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 894 | |
895 | return (ret); | |
896 | } | |
897 | ||
05114c74 | 898 | static void *sshpam_ctxt, *sshpam_authok; |
899 | extern KbdintDevice sshpam_device; | |
900 | ||
901 | int | |
8b3ec5fd | 902 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 903 | { |
904 | ||
905 | debug3("%s", __func__); | |
906 | authctxt->user = buffer_get_string(m, NULL); | |
907 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
908 | sshpam_authok = NULL; | |
909 | buffer_clear(m); | |
910 | if (sshpam_ctxt != NULL) { | |
911 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
912 | buffer_put_int(m, 1); | |
913 | } else { | |
914 | buffer_put_int(m, 0); | |
915 | } | |
8b3ec5fd | 916 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 917 | return (0); |
918 | } | |
919 | ||
920 | int | |
8b3ec5fd | 921 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 922 | { |
923 | char *name, *info, **prompts; | |
a1a073cc | 924 | u_int i, num, *echo_on; |
925 | int ret; | |
05114c74 | 926 | |
927 | debug3("%s", __func__); | |
928 | sshpam_authok = NULL; | |
929 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
930 | if (ret == 0 && num == 0) | |
931 | sshpam_authok = sshpam_ctxt; | |
932 | if (num > 1 || name == NULL || info == NULL) | |
933 | ret = -1; | |
934 | buffer_clear(m); | |
935 | buffer_put_int(m, ret); | |
936 | buffer_put_cstring(m, name); | |
937 | xfree(name); | |
938 | buffer_put_cstring(m, info); | |
939 | xfree(info); | |
940 | buffer_put_int(m, num); | |
941 | for (i = 0; i < num; ++i) { | |
942 | buffer_put_cstring(m, prompts[i]); | |
943 | xfree(prompts[i]); | |
944 | buffer_put_int(m, echo_on[i]); | |
945 | } | |
946 | if (prompts != NULL) | |
947 | xfree(prompts); | |
948 | if (echo_on != NULL) | |
949 | xfree(echo_on); | |
2ae7f715 | 950 | auth_method = "keyboard-interactive/pam"; |
8b3ec5fd | 951 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 952 | return (0); |
953 | } | |
954 | ||
955 | int | |
8b3ec5fd | 956 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 957 | { |
958 | char **resp; | |
a1a073cc | 959 | u_int i, num; |
960 | int ret; | |
05114c74 | 961 | |
962 | debug3("%s", __func__); | |
963 | sshpam_authok = NULL; | |
964 | num = buffer_get_int(m); | |
965 | if (num > 0) { | |
01d35895 | 966 | resp = xcalloc(num, sizeof(char *)); |
05114c74 | 967 | for (i = 0; i < num; ++i) |
968 | resp[i] = buffer_get_string(m, NULL); | |
969 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
970 | for (i = 0; i < num; ++i) | |
971 | xfree(resp[i]); | |
972 | xfree(resp); | |
973 | } else { | |
974 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
975 | } | |
976 | buffer_clear(m); | |
977 | buffer_put_int(m, ret); | |
8b3ec5fd | 978 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 979 | auth_method = "keyboard-interactive/pam"; |
980 | if (ret == 0) | |
981 | sshpam_authok = sshpam_ctxt; | |
982 | return (0); | |
983 | } | |
984 | ||
985 | int | |
8b3ec5fd | 986 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 987 | { |
988 | ||
989 | debug3("%s", __func__); | |
990 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
991 | buffer_clear(m); | |
8b3ec5fd | 992 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
2ae7f715 | 993 | auth_method = "keyboard-interactive/pam"; |
05114c74 | 994 | return (sshpam_authok == sshpam_ctxt); |
995 | } | |
ad200abb | 996 | #endif |
997 | ||
1853d1ef | 998 | static void |
999 | mm_append_debug(Buffer *m) | |
1000 | { | |
1001 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 1002 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 1003 | buffer_append(m, buffer_ptr(&auth_debug), |
1004 | buffer_len(&auth_debug)); | |
1005 | buffer_clear(&auth_debug); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | int | |
ca75d7de | 1010 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 1011 | { |
1012 | Key *key; | |
661e45a0 | 1013 | char *cuser, *chost; |
1014 | u_char *blob; | |
1853d1ef | 1015 | u_int bloblen; |
1016 | enum mm_keytype type = 0; | |
1017 | int allowed = 0; | |
1018 | ||
1588c277 | 1019 | debug3("%s entering", __func__); |
1853d1ef | 1020 | |
1021 | type = buffer_get_int(m); | |
1022 | cuser = buffer_get_string(m, NULL); | |
1023 | chost = buffer_get_string(m, NULL); | |
1024 | blob = buffer_get_string(m, &bloblen); | |
1025 | ||
1026 | key = key_from_blob(blob, bloblen); | |
1027 | ||
1028 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1029 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 1030 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 1031 | |
1588c277 | 1032 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 1033 | |
fdaef11e | 1034 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 1035 | switch (type) { |
1853d1ef | 1036 | case MM_USERKEY: |
aa586f8e | 1037 | allowed = options.pubkey_authentication && |
1038 | user_key_allowed(authctxt->pw, key); | |
c023a130 | 1039 | auth_method = "publickey"; |
52ad6b9a | 1040 | if (options.pubkey_authentication && allowed != 1) |
1041 | auth_clear_options(); | |
1853d1ef | 1042 | break; |
1043 | case MM_HOSTKEY: | |
aa586f8e | 1044 | allowed = options.hostbased_authentication && |
1045 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 1046 | cuser, chost, key); |
c023a130 | 1047 | auth_method = "hostbased"; |
1853d1ef | 1048 | break; |
1049 | case MM_RSAHOSTKEY: | |
1050 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1051 | allowed = options.rhosts_rsa_authentication && |
1052 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1053 | cuser, chost, key); |
52ad6b9a | 1054 | if (options.rhosts_rsa_authentication && allowed != 1) |
1055 | auth_clear_options(); | |
c023a130 | 1056 | auth_method = "rsa"; |
1853d1ef | 1057 | break; |
1058 | default: | |
1588c277 | 1059 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1060 | break; |
1061 | } | |
1853d1ef | 1062 | } |
3e2f2431 | 1063 | if (key != NULL) |
1064 | key_free(key); | |
1853d1ef | 1065 | |
1066 | /* clear temporarily storage (used by verify) */ | |
1067 | monitor_reset_key_state(); | |
1068 | ||
1069 | if (allowed) { | |
1070 | /* Save temporarily for comparison in verify */ | |
1071 | key_blob = blob; | |
1072 | key_bloblen = bloblen; | |
1073 | key_blobtype = type; | |
1074 | hostbased_cuser = cuser; | |
1075 | hostbased_chost = chost; | |
98d40a74 | 1076 | } else { |
c023a130 | 1077 | /* Log failed attempt */ |
1078 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
98d40a74 | 1079 | xfree(blob); |
1080 | xfree(cuser); | |
1081 | xfree(chost); | |
1853d1ef | 1082 | } |
1083 | ||
1084 | debug3("%s: key %p is %s", | |
c54d3d1c | 1085 | __func__, key, allowed ? "allowed" : "not allowed"); |
1853d1ef | 1086 | |
1087 | buffer_clear(m); | |
1088 | buffer_put_int(m, allowed); | |
92e15201 | 1089 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1090 | |
1091 | mm_append_debug(m); | |
1092 | ||
ca75d7de | 1093 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1094 | |
1095 | if (type == MM_RSAHOSTKEY) | |
1096 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1097 | ||
1098 | return (0); | |
1099 | } | |
1100 | ||
1101 | static int | |
1102 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1103 | { | |
1104 | Buffer b; | |
661e45a0 | 1105 | char *p; |
1853d1ef | 1106 | u_int len; |
1107 | int fail = 0; | |
1853d1ef | 1108 | |
1109 | buffer_init(&b); | |
1110 | buffer_append(&b, data, datalen); | |
1111 | ||
1112 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1113 | p = buffer_ptr(&b); |
1114 | len = buffer_len(&b); | |
1115 | if ((session_id2 == NULL) || | |
1116 | (len < session_id2_len) || | |
1117 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1118 | fail++; | |
1853d1ef | 1119 | buffer_consume(&b, session_id2_len); |
1120 | } else { | |
521d606b | 1121 | p = buffer_get_string(&b, &len); |
1122 | if ((session_id2 == NULL) || | |
1123 | (len != session_id2_len) || | |
1124 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1125 | fail++; |
521d606b | 1126 | xfree(p); |
1853d1ef | 1127 | } |
1128 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1129 | fail++; | |
1130 | p = buffer_get_string(&b, NULL); | |
1131 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1132 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1133 | authctxt->user, p); |
1134 | fail++; | |
1135 | } | |
1136 | xfree(p); | |
1137 | buffer_skip_string(&b); | |
1138 | if (datafellows & SSH_BUG_PKAUTH) { | |
1139 | if (!buffer_get_char(&b)) | |
1140 | fail++; | |
1141 | } else { | |
1142 | p = buffer_get_string(&b, NULL); | |
1143 | if (strcmp("publickey", p) != 0) | |
1144 | fail++; | |
1145 | xfree(p); | |
1146 | if (!buffer_get_char(&b)) | |
1147 | fail++; | |
1148 | buffer_skip_string(&b); | |
1149 | } | |
1150 | buffer_skip_string(&b); | |
1151 | if (buffer_len(&b) != 0) | |
1152 | fail++; | |
1153 | buffer_free(&b); | |
1154 | return (fail == 0); | |
1155 | } | |
1156 | ||
1157 | static int | |
661e45a0 | 1158 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1159 | char *chost) | |
1853d1ef | 1160 | { |
1161 | Buffer b; | |
661e45a0 | 1162 | char *p; |
1853d1ef | 1163 | u_int len; |
1164 | int fail = 0; | |
1853d1ef | 1165 | |
1166 | buffer_init(&b); | |
1167 | buffer_append(&b, data, datalen); | |
1168 | ||
521d606b | 1169 | p = buffer_get_string(&b, &len); |
1170 | if ((session_id2 == NULL) || | |
1171 | (len != session_id2_len) || | |
1172 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1173 | fail++; |
521d606b | 1174 | xfree(p); |
1175 | ||
1853d1ef | 1176 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1177 | fail++; | |
1178 | p = buffer_get_string(&b, NULL); | |
1179 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1180 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1181 | authctxt->user, p); |
1182 | fail++; | |
1183 | } | |
1184 | xfree(p); | |
1185 | buffer_skip_string(&b); /* service */ | |
1186 | p = buffer_get_string(&b, NULL); | |
1187 | if (strcmp(p, "hostbased") != 0) | |
1188 | fail++; | |
1189 | xfree(p); | |
1190 | buffer_skip_string(&b); /* pkalg */ | |
1191 | buffer_skip_string(&b); /* pkblob */ | |
1192 | ||
1193 | /* verify client host, strip trailing dot if necessary */ | |
1194 | p = buffer_get_string(&b, NULL); | |
1195 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1196 | p[len - 1] = '\0'; | |
1197 | if (strcmp(p, chost) != 0) | |
1198 | fail++; | |
1199 | xfree(p); | |
1200 | ||
1201 | /* verify client user */ | |
1202 | p = buffer_get_string(&b, NULL); | |
1203 | if (strcmp(p, cuser) != 0) | |
1204 | fail++; | |
1205 | xfree(p); | |
1206 | ||
1207 | if (buffer_len(&b) != 0) | |
1208 | fail++; | |
1209 | buffer_free(&b); | |
1210 | return (fail == 0); | |
1211 | } | |
1212 | ||
1213 | int | |
ca75d7de | 1214 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1215 | { |
1216 | Key *key; | |
1217 | u_char *signature, *data, *blob; | |
1218 | u_int signaturelen, datalen, bloblen; | |
1219 | int verified = 0; | |
1220 | int valid_data = 0; | |
1221 | ||
1222 | blob = buffer_get_string(m, &bloblen); | |
1223 | signature = buffer_get_string(m, &signaturelen); | |
1224 | data = buffer_get_string(m, &datalen); | |
1225 | ||
1226 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1227 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1228 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1229 | |
1230 | key = key_from_blob(blob, bloblen); | |
1231 | if (key == NULL) | |
1588c277 | 1232 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1233 | |
1234 | switch (key_blobtype) { | |
1235 | case MM_USERKEY: | |
1236 | valid_data = monitor_valid_userblob(data, datalen); | |
1237 | break; | |
1238 | case MM_HOSTKEY: | |
1239 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1240 | hostbased_cuser, hostbased_chost); | |
1241 | break; | |
1242 | default: | |
1243 | valid_data = 0; | |
1244 | break; | |
1245 | } | |
1246 | if (!valid_data) | |
1588c277 | 1247 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1248 | |
1249 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1250 | debug3("%s: key %p signature %s", | |
89916e8c | 1251 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
1853d1ef | 1252 | |
1253 | key_free(key); | |
1254 | xfree(blob); | |
1255 | xfree(signature); | |
1256 | xfree(data); | |
1257 | ||
d17ef027 | 1258 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1259 | ||
1853d1ef | 1260 | monitor_reset_key_state(); |
1261 | ||
1262 | buffer_clear(m); | |
1263 | buffer_put_int(m, verified); | |
ca75d7de | 1264 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1265 | |
89916e8c | 1266 | return (verified == 1); |
1853d1ef | 1267 | } |
1268 | ||
1269 | static void | |
1270 | mm_record_login(Session *s, struct passwd *pw) | |
1271 | { | |
1272 | socklen_t fromlen; | |
1273 | struct sockaddr_storage from; | |
1274 | ||
1275 | /* | |
1276 | * Get IP address of client. If the connection is not a socket, let | |
1277 | * the address be 0.0.0.0. | |
1278 | */ | |
1279 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1280 | fromlen = sizeof(from); |
1853d1ef | 1281 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1282 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1283 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1284 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1285 | cleanup_exit(255); |
1853d1ef | 1286 | } |
1287 | } | |
1288 | /* Record that there was a login on that tty from the remote host. */ | |
1289 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1290 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1291 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1292 | } |
1293 | ||
1294 | static void | |
1295 | mm_session_close(Session *s) | |
1296 | { | |
b9ed513a | 1297 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1298 | if (s->ttyfd != -1) { |
c56969f9 | 1299 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1300 | session_pty_cleanup2(s); |
1301 | } | |
c6dca55e | 1302 | session_unused(s->self); |
1853d1ef | 1303 | } |
1304 | ||
1305 | int | |
ca75d7de | 1306 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1307 | { |
b5a28cbc | 1308 | extern struct monitor *pmonitor; |
1853d1ef | 1309 | Session *s; |
1310 | int res, fd0; | |
1311 | ||
1588c277 | 1312 | debug3("%s entering", __func__); |
1853d1ef | 1313 | |
1314 | buffer_clear(m); | |
1315 | s = session_new(); | |
1316 | if (s == NULL) | |
1317 | goto error; | |
1318 | s->authctxt = authctxt; | |
1319 | s->pw = authctxt->pw; | |
b5a28cbc | 1320 | s->pid = pmonitor->m_pid; |
1853d1ef | 1321 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1322 | if (res == 0) | |
1323 | goto error; | |
1853d1ef | 1324 | pty_setowner(authctxt->pw, s->tty); |
1325 | ||
1326 | buffer_put_int(m, 1); | |
1327 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1328 | |
1329 | /* We need to trick ttyslot */ | |
1330 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1331 | fatal("%s: dup2", __func__); |
1853d1ef | 1332 | |
1333 | mm_record_login(s, authctxt->pw); | |
1334 | ||
1335 | /* Now we can close the file descriptor again */ | |
1336 | close(0); | |
1337 | ||
be2ca0c9 | 1338 | /* send messages generated by record_login */ |
1339 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1340 | buffer_clear(&loginmsg); | |
1341 | ||
1342 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1343 | ||
8de7aaab | 1344 | if (mm_send_fd(sock, s->ptyfd) == -1 || |
1345 | mm_send_fd(sock, s->ttyfd) == -1) | |
1346 | fatal("%s: send fds failed", __func__); | |
be2ca0c9 | 1347 | |
1853d1ef | 1348 | /* make sure nothing uses fd 0 */ |
1349 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1350 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1351 | if (fd0 != 0) |
1588c277 | 1352 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1353 | |
1354 | /* slave is not needed */ | |
1355 | close(s->ttyfd); | |
1356 | s->ttyfd = s->ptyfd; | |
1357 | /* no need to dup() because nobody closes ptyfd */ | |
1358 | s->ptymaster = s->ptyfd; | |
1359 | ||
c56969f9 | 1360 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1361 | |
1362 | return (0); | |
1363 | ||
1364 | error: | |
1365 | if (s != NULL) | |
1366 | mm_session_close(s); | |
1367 | buffer_put_int(m, 0); | |
ca75d7de | 1368 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1369 | return (0); |
1370 | } | |
1371 | ||
1372 | int | |
ca75d7de | 1373 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1374 | { |
1375 | Session *s; | |
1376 | char *tty; | |
1377 | ||
1588c277 | 1378 | debug3("%s entering", __func__); |
1853d1ef | 1379 | |
1380 | tty = buffer_get_string(m, NULL); | |
1381 | if ((s = session_by_tty(tty)) != NULL) | |
1382 | mm_session_close(s); | |
1383 | buffer_clear(m); | |
1384 | xfree(tty); | |
1385 | return (0); | |
1386 | } | |
1387 | ||
1388 | int | |
ca75d7de | 1389 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1390 | { |
1391 | BIGNUM *p; | |
1392 | int rsafail; | |
1393 | ||
1394 | /* Turn off permissions */ | |
75cccc2c | 1395 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1396 | |
1397 | if ((p = BN_new()) == NULL) | |
1588c277 | 1398 | fatal("%s: BN_new", __func__); |
1853d1ef | 1399 | |
1400 | buffer_get_bignum2(m, p); | |
1401 | ||
1402 | rsafail = ssh1_session_key(p); | |
1403 | ||
1404 | buffer_clear(m); | |
1405 | buffer_put_int(m, rsafail); | |
1406 | buffer_put_bignum2(m, p); | |
1407 | ||
1408 | BN_clear_free(p); | |
1409 | ||
ca75d7de | 1410 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1411 | |
1412 | /* Turn on permissions for sessid passing */ | |
1413 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1414 | ||
1415 | return (0); | |
1416 | } | |
1417 | ||
1418 | int | |
ca75d7de | 1419 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1420 | { |
1421 | int i; | |
1422 | ||
1588c277 | 1423 | debug3("%s entering", __func__); |
1853d1ef | 1424 | |
1425 | if (buffer_len(m) != 16) | |
1588c277 | 1426 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1427 | for (i = 0; i < 16; i++) |
1428 | session_id[i] = buffer_get_char(m); | |
1429 | ||
1430 | /* Turn on permissions for getpwnam */ | |
1431 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1432 | ||
1433 | return (0); | |
1434 | } | |
1435 | ||
1436 | int | |
ca75d7de | 1437 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1438 | { |
1439 | BIGNUM *client_n; | |
1440 | Key *key = NULL; | |
1441 | u_char *blob = NULL; | |
1442 | u_int blen = 0; | |
1443 | int allowed = 0; | |
1444 | ||
1588c277 | 1445 | debug3("%s entering", __func__); |
1853d1ef | 1446 | |
c023a130 | 1447 | auth_method = "rsa"; |
aa586f8e | 1448 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1449 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1450 | fatal("%s: BN_new", __func__); |
1853d1ef | 1451 | buffer_get_bignum2(m, client_n); |
1452 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1453 | BN_clear_free(client_n); | |
1454 | } | |
1455 | buffer_clear(m); | |
1456 | buffer_put_int(m, allowed); | |
92e15201 | 1457 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1458 | |
1459 | /* clear temporarily storage (used by generate challenge) */ | |
1460 | monitor_reset_key_state(); | |
1461 | ||
1462 | if (allowed && key != NULL) { | |
1463 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1464 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1465 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1466 | buffer_put_string(m, blob, blen); |
1467 | ||
1468 | /* Save temporarily for comparison in verify */ | |
1469 | key_blob = blob; | |
1470 | key_bloblen = blen; | |
1471 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1472 | } |
3e2f2431 | 1473 | if (key != NULL) |
1474 | key_free(key); | |
1853d1ef | 1475 | |
1476 | mm_append_debug(m); | |
1477 | ||
ca75d7de | 1478 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1479 | |
1480 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1481 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1482 | return (0); | |
1483 | } | |
1484 | ||
1485 | int | |
ca75d7de | 1486 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1487 | { |
1488 | Key *key = NULL; | |
1489 | u_char *blob; | |
1490 | u_int blen; | |
1491 | ||
1588c277 | 1492 | debug3("%s entering", __func__); |
1853d1ef | 1493 | |
1494 | if (!authctxt->valid) | |
1588c277 | 1495 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1496 | blob = buffer_get_string(m, &blen); |
1497 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1498 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1499 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1500 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1501 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1502 | fatal("%s: received bad key", __func__); |
28b5d376 | 1503 | if (key->type != KEY_RSA) |
1504 | fatal("%s: received bad key type %d", __func__, key->type); | |
1505 | key->type = KEY_RSA1; | |
1853d1ef | 1506 | if (ssh1_challenge) |
1507 | BN_clear_free(ssh1_challenge); | |
1508 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1509 | ||
1510 | buffer_clear(m); | |
1511 | buffer_put_bignum2(m, ssh1_challenge); | |
1512 | ||
1588c277 | 1513 | debug3("%s sending reply", __func__); |
ca75d7de | 1514 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1515 | |
1516 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1517 | |
1518 | xfree(blob); | |
1519 | key_free(key); | |
1853d1ef | 1520 | return (0); |
1521 | } | |
1522 | ||
1523 | int | |
ca75d7de | 1524 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1525 | { |
1526 | Key *key = NULL; | |
1527 | u_char *blob, *response; | |
1528 | u_int blen, len; | |
1529 | int success; | |
1530 | ||
1588c277 | 1531 | debug3("%s entering", __func__); |
1853d1ef | 1532 | |
1533 | if (!authctxt->valid) | |
1588c277 | 1534 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1535 | if (ssh1_challenge == NULL) |
1588c277 | 1536 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1537 | |
1538 | blob = buffer_get_string(m, &blen); | |
1539 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1540 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1541 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1542 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1543 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1544 | fatal("%s: received bad key", __func__); |
1853d1ef | 1545 | response = buffer_get_string(m, &len); |
1546 | if (len != 16) | |
1588c277 | 1547 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1548 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1549 | ||
3e2f2431 | 1550 | xfree(blob); |
1853d1ef | 1551 | key_free(key); |
1552 | xfree(response); | |
1553 | ||
1554 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1555 | ||
1556 | /* reset state */ | |
1557 | BN_clear_free(ssh1_challenge); | |
1558 | ssh1_challenge = NULL; | |
1559 | monitor_reset_key_state(); | |
1560 | ||
1561 | buffer_clear(m); | |
1562 | buffer_put_int(m, success); | |
ca75d7de | 1563 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1564 | |
1565 | return (success); | |
1566 | } | |
1567 | ||
1568 | int | |
ca75d7de | 1569 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1570 | { |
b5a28cbc | 1571 | extern struct monitor *pmonitor; |
1853d1ef | 1572 | int res, status; |
1573 | ||
1588c277 | 1574 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1575 | |
1576 | /* The child is terminating */ | |
1577 | session_destroy_all(&mm_session_close); | |
1578 | ||
83fa7e8d | 1579 | #ifdef USE_PAM |
1580 | if (options.use_pam) | |
1581 | sshpam_cleanup(); | |
1582 | #endif | |
1583 | ||
b5a28cbc | 1584 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1585 | if (errno != EINTR) |
1586 | exit(1); | |
1853d1ef | 1587 | |
1588 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1589 | ||
1590 | /* Terminate process */ | |
f6be21a0 | 1591 | exit(res); |
1853d1ef | 1592 | } |
1593 | ||
6039eeef | 1594 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1595 | /* Report that an audit event occurred */ |
1596 | int | |
1597 | mm_answer_audit_event(int socket, Buffer *m) | |
1598 | { | |
1599 | ssh_audit_event_t event; | |
1600 | ||
1601 | debug3("%s entering", __func__); | |
1602 | ||
1603 | event = buffer_get_int(m); | |
c00e4d75 | 1604 | switch(event) { |
6039eeef | 1605 | case SSH_AUTH_FAIL_PUBKEY: |
1606 | case SSH_AUTH_FAIL_HOSTBASED: | |
1607 | case SSH_AUTH_FAIL_GSSAPI: | |
1608 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1609 | case SSH_LOGIN_ROOT_DENIED: | |
1610 | case SSH_CONNECTION_CLOSE: | |
1611 | case SSH_INVALID_USER: | |
c00e4d75 | 1612 | audit_event(event); |
1613 | break; | |
1614 | default: | |
1615 | fatal("Audit event type %d not permitted", event); | |
1616 | } | |
1617 | ||
1618 | return (0); | |
1619 | } | |
1620 | ||
1621 | int | |
1622 | mm_answer_audit_command(int socket, Buffer *m) | |
1623 | { | |
1624 | u_int len; | |
1625 | char *cmd; | |
1626 | ||
1627 | debug3("%s entering", __func__); | |
1628 | cmd = buffer_get_string(m, &len); | |
1629 | /* sanity check command, if so how? */ | |
1630 | audit_run_command(cmd); | |
1631 | xfree(cmd); | |
c00e4d75 | 1632 | return (0); |
1633 | } | |
6039eeef | 1634 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1635 | |
1853d1ef | 1636 | void |
b5a28cbc | 1637 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1638 | { |
1639 | if (compat20) { | |
1640 | set_newkeys(MODE_IN); | |
1641 | set_newkeys(MODE_OUT); | |
1642 | } else { | |
1853d1ef | 1643 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1644 | packet_set_encryption_key(child_state.ssh1key, |
1645 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1646 | xfree(child_state.ssh1key); | |
1853d1ef | 1647 | } |
1648 | ||
9459414c | 1649 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1650 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1651 | xfree(child_state.keyout); | |
1652 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1653 | xfree(child_state.keyin); | |
1654 | ||
1655 | if (!compat20) { | |
1656 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1657 | xfree(child_state.ivout); | |
1658 | packet_set_iv(MODE_IN, child_state.ivin); | |
1659 | xfree(child_state.ivin); | |
1660 | } | |
1661 | ||
1662 | memcpy(&incoming_stream, &child_state.incoming, | |
1663 | sizeof(incoming_stream)); | |
1664 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1665 | sizeof(outgoing_stream)); | |
1666 | ||
1667 | /* Update with new address */ | |
0496cf34 | 1668 | if (options.compression) |
1669 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1670 | |
1671 | /* Network I/O buffers */ | |
1672 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1673 | buffer_clear(&input); | |
1674 | buffer_append(&input, child_state.input, child_state.ilen); | |
1675 | memset(child_state.input, 0, child_state.ilen); | |
1676 | xfree(child_state.input); | |
1677 | ||
1678 | buffer_clear(&output); | |
1679 | buffer_append(&output, child_state.output, child_state.olen); | |
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 */ |