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1853d1ef | 1 | /* |
2 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
3 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
aa2eae64 | 28 | |
29 | #include <sys/types.h> | |
30 | #include <sys/wait.h> | |
1853d1ef | 31 | |
b5b88c19 | 32 | #ifdef HAVE_PATHS_H |
a75f5360 | 33 | #include <paths.h> |
b5b88c19 | 34 | #endif |
ada68823 | 35 | #include <signal.h> |
1853d1ef | 36 | |
37 | #ifdef SKEY | |
38 | #include <skey.h> | |
39 | #endif | |
40 | ||
a75f5360 | 41 | #include <openssl/dh.h> |
42 | ||
1853d1ef | 43 | #include "ssh.h" |
44 | #include "auth.h" | |
45 | #include "kex.h" | |
46 | #include "dh.h" | |
a655c012 | 47 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
48 | #undef TARGET_OS_MAC | |
9b08c23f | 49 | #include "zlib.h" |
a655c012 | 50 | #define TARGET_OS_MAC 1 |
51 | #else | |
52 | #include "zlib.h" | |
53 | #endif | |
1853d1ef | 54 | #include "packet.h" |
55 | #include "auth-options.h" | |
56 | #include "sshpty.h" | |
57 | #include "channels.h" | |
58 | #include "session.h" | |
59 | #include "sshlogin.h" | |
60 | #include "canohost.h" | |
61 | #include "log.h" | |
62 | #include "servconf.h" | |
63 | #include "monitor.h" | |
64 | #include "monitor_mm.h" | |
65 | #include "monitor_wrap.h" | |
66 | #include "monitor_fdpass.h" | |
67 | #include "xmalloc.h" | |
68 | #include "misc.h" | |
69 | #include "buffer.h" | |
70 | #include "bufaux.h" | |
71 | #include "compat.h" | |
72 | #include "ssh2.h" | |
1853d1ef | 73 | |
7364bd04 | 74 | #ifdef GSSAPI |
75 | #include "ssh-gss.h" | |
76 | static Gssctxt *gsscontext = NULL; | |
77 | #endif | |
78 | ||
1853d1ef | 79 | /* Imports */ |
80 | extern ServerOptions options; | |
81 | extern u_int utmp_len; | |
82 | extern Newkeys *current_keys[]; | |
83 | extern z_stream incoming_stream; | |
84 | extern z_stream outgoing_stream; | |
85 | extern u_char session_id[]; | |
86 | extern Buffer input, output; | |
87 | extern Buffer auth_debug; | |
88 | extern int auth_debug_init; | |
be2ca0c9 | 89 | extern Buffer loginmsg; |
1853d1ef | 90 | |
91 | /* State exported from the child */ | |
92 | ||
93 | struct { | |
94 | z_stream incoming; | |
95 | z_stream outgoing; | |
96 | u_char *keyin; | |
97 | u_int keyinlen; | |
98 | u_char *keyout; | |
99 | u_int keyoutlen; | |
100 | u_char *ivin; | |
101 | u_int ivinlen; | |
102 | u_char *ivout; | |
103 | u_int ivoutlen; | |
9459414c | 104 | u_char *ssh1key; |
105 | u_int ssh1keylen; | |
1853d1ef | 106 | int ssh1cipher; |
107 | int ssh1protoflags; | |
108 | u_char *input; | |
109 | u_int ilen; | |
110 | u_char *output; | |
111 | u_int olen; | |
112 | } child_state; | |
113 | ||
b8e04133 | 114 | /* Functions on the monitor that answer unprivileged requests */ |
1853d1ef | 115 | |
116 | int mm_answer_moduli(int, Buffer *); | |
117 | int mm_answer_sign(int, Buffer *); | |
118 | int mm_answer_pwnamallow(int, Buffer *); | |
94a73cdc | 119 | int mm_answer_auth2_read_banner(int, Buffer *); |
1853d1ef | 120 | int mm_answer_authserv(int, Buffer *); |
121 | int mm_answer_authpassword(int, Buffer *); | |
122 | int mm_answer_bsdauthquery(int, Buffer *); | |
123 | int mm_answer_bsdauthrespond(int, Buffer *); | |
124 | int mm_answer_skeyquery(int, Buffer *); | |
125 | int mm_answer_skeyrespond(int, Buffer *); | |
126 | int mm_answer_keyallowed(int, Buffer *); | |
127 | int mm_answer_keyverify(int, Buffer *); | |
128 | int mm_answer_pty(int, Buffer *); | |
129 | int mm_answer_pty_cleanup(int, Buffer *); | |
130 | int mm_answer_term(int, Buffer *); | |
131 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
132 | int mm_answer_rsa_challenge(int, Buffer *); | |
133 | int mm_answer_rsa_response(int, Buffer *); | |
134 | int mm_answer_sesskey(int, Buffer *); | |
135 | int mm_answer_sessid(int, Buffer *); | |
136 | ||
ad200abb | 137 | #ifdef USE_PAM |
138 | int mm_answer_pam_start(int, Buffer *); | |
5b9e2464 | 139 | int mm_answer_pam_account(int, Buffer *); |
05114c74 | 140 | int mm_answer_pam_init_ctx(int, Buffer *); |
141 | int mm_answer_pam_query(int, Buffer *); | |
142 | int mm_answer_pam_respond(int, Buffer *); | |
143 | int mm_answer_pam_free_ctx(int, Buffer *); | |
ad200abb | 144 | #endif |
145 | ||
7364bd04 | 146 | #ifdef GSSAPI |
147 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
148 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
149 | int mm_answer_gss_userok(int, Buffer *); | |
0789992b | 150 | int mm_answer_gss_checkmic(int, Buffer *); |
7364bd04 | 151 | #endif |
696f6bef | 152 | |
6039eeef | 153 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 154 | int mm_answer_audit_event(int, Buffer *); |
155 | int mm_answer_audit_command(int, Buffer *); | |
156 | #endif | |
157 | ||
1853d1ef | 158 | static Authctxt *authctxt; |
159 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
160 | ||
161 | /* local state for key verify */ | |
162 | static u_char *key_blob = NULL; | |
163 | static u_int key_bloblen = 0; | |
164 | static int key_blobtype = MM_NOKEY; | |
661e45a0 | 165 | static char *hostbased_cuser = NULL; |
166 | static char *hostbased_chost = NULL; | |
1853d1ef | 167 | static char *auth_method = "unknown"; |
a27002e5 | 168 | static u_int session_id2_len = 0; |
521d606b | 169 | static u_char *session_id2 = NULL; |
3a39206f | 170 | static pid_t monitor_child_pid; |
1853d1ef | 171 | |
172 | struct mon_table { | |
173 | enum monitor_reqtype type; | |
174 | int flags; | |
175 | int (*f)(int, Buffer *); | |
176 | }; | |
177 | ||
178 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
179 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
180 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
181 | ||
182 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
183 | ||
184 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
185 | ||
186 | struct mon_table mon_dispatch_proto20[] = { | |
187 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
188 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
189 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
190 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, | |
94a73cdc | 191 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, |
1853d1ef | 192 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, |
ad200abb | 193 | #ifdef USE_PAM |
194 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 195 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 196 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
197 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
198 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
199 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
8b314ec9 | 200 | #endif |
6039eeef | 201 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 202 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
c00e4d75 | 203 | #endif |
1853d1ef | 204 | #ifdef BSD_AUTH |
205 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 206 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 207 | #endif |
208 | #ifdef SKEY | |
209 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
210 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
211 | #endif | |
212 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
213 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
7364bd04 | 214 | #ifdef GSSAPI |
215 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
216 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
217 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
0789992b | 218 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
802e01b8 | 219 | #endif |
1853d1ef | 220 | {0, 0, NULL} |
221 | }; | |
222 | ||
223 | struct mon_table mon_dispatch_postauth20[] = { | |
224 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, | |
225 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
226 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
227 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
228 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 229 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 230 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
231 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
232 | #endif | |
1853d1ef | 233 | {0, 0, NULL} |
234 | }; | |
235 | ||
236 | struct mon_table mon_dispatch_proto15[] = { | |
237 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
238 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
239 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
240 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
241 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
242 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
243 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
244 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
245 | #ifdef BSD_AUTH | |
246 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
1720c23b | 247 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
1853d1ef | 248 | #endif |
249 | #ifdef SKEY | |
250 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
251 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
efe44db6 | 252 | #endif |
253 | #ifdef USE_PAM | |
254 | {MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start}, | |
5b9e2464 | 255 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
05114c74 | 256 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, |
257 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
258 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
259 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
c00e4d75 | 260 | #endif |
6039eeef | 261 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 262 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
1853d1ef | 263 | #endif |
264 | {0, 0, NULL} | |
265 | }; | |
266 | ||
267 | struct mon_table mon_dispatch_postauth15[] = { | |
268 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
269 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
270 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
6039eeef | 271 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 272 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, |
d9bc3cde | 273 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, |
c00e4d75 | 274 | #endif |
1853d1ef | 275 | {0, 0, NULL} |
276 | }; | |
277 | ||
278 | struct mon_table *mon_dispatch; | |
279 | ||
280 | /* Specifies if a certain message is allowed at the moment */ | |
281 | ||
282 | static void | |
283 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
284 | { | |
285 | while (ent->f != NULL) { | |
286 | if (ent->type == type) { | |
287 | ent->flags &= ~MON_PERMIT; | |
288 | ent->flags |= permit ? MON_PERMIT : 0; | |
289 | return; | |
290 | } | |
291 | ent++; | |
292 | } | |
293 | } | |
294 | ||
295 | static void | |
296 | monitor_permit_authentications(int permit) | |
297 | { | |
298 | struct mon_table *ent = mon_dispatch; | |
299 | ||
300 | while (ent->f != NULL) { | |
301 | if (ent->flags & MON_AUTH) { | |
302 | ent->flags &= ~MON_PERMIT; | |
303 | ent->flags |= permit ? MON_PERMIT : 0; | |
304 | } | |
305 | ent++; | |
306 | } | |
307 | } | |
308 | ||
2362db19 | 309 | void |
310 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
1853d1ef | 311 | { |
312 | struct mon_table *ent; | |
313 | int authenticated = 0; | |
314 | ||
315 | debug3("preauth child monitor started"); | |
316 | ||
2362db19 | 317 | authctxt = _authctxt; |
318 | memset(authctxt, 0, sizeof(*authctxt)); | |
319 | ||
e05df884 | 320 | authctxt->loginmsg = &loginmsg; |
321 | ||
1853d1ef | 322 | if (compat20) { |
323 | mon_dispatch = mon_dispatch_proto20; | |
324 | ||
325 | /* Permit requests for moduli and signatures */ | |
326 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
327 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
328 | } else { | |
329 | mon_dispatch = mon_dispatch_proto15; | |
330 | ||
331 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
332 | } | |
333 | ||
1853d1ef | 334 | /* The first few requests do not require asynchronous access */ |
335 | while (!authenticated) { | |
b5a28cbc | 336 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); |
1853d1ef | 337 | if (authenticated) { |
338 | if (!(ent->flags & MON_AUTHDECIDE)) | |
339 | fatal("%s: unexpected authentication from %d", | |
1588c277 | 340 | __func__, ent->type); |
1853d1ef | 341 | if (authctxt->pw->pw_uid == 0 && |
342 | !auth_root_allowed(auth_method)) | |
343 | authenticated = 0; | |
5b9e2464 | 344 | #ifdef USE_PAM |
345 | /* PAM needs to perform account checks after auth */ | |
4d1de3a3 | 346 | if (options.use_pam && authenticated) { |
5b9e2464 | 347 | Buffer m; |
348 | ||
349 | buffer_init(&m); | |
aff51935 | 350 | mm_request_receive_expect(pmonitor->m_sendfd, |
5b9e2464 | 351 | MONITOR_REQ_PAM_ACCOUNT, &m); |
352 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
353 | buffer_free(&m); | |
354 | } | |
355 | #endif | |
1853d1ef | 356 | } |
357 | ||
358 | if (ent->flags & MON_AUTHDECIDE) { | |
359 | auth_log(authctxt, authenticated, auth_method, | |
360 | compat20 ? " ssh2" : ""); | |
361 | if (!authenticated) | |
362 | authctxt->failures++; | |
363 | } | |
364 | } | |
365 | ||
366 | if (!authctxt->valid) | |
1588c277 | 367 | fatal("%s: authenticated invalid user", __func__); |
1853d1ef | 368 | |
369 | debug("%s: %s has been authenticated by privileged process", | |
1588c277 | 370 | __func__, authctxt->user); |
1853d1ef | 371 | |
b5a28cbc | 372 | mm_get_keystate(pmonitor); |
1853d1ef | 373 | } |
374 | ||
3a39206f | 375 | static void |
376 | monitor_set_child_handler(pid_t pid) | |
377 | { | |
378 | monitor_child_pid = pid; | |
379 | } | |
380 | ||
381 | static void | |
ca75d7de | 382 | monitor_child_handler(int sig) |
3a39206f | 383 | { |
ca75d7de | 384 | kill(monitor_child_pid, sig); |
3a39206f | 385 | } |
386 | ||
1853d1ef | 387 | void |
b5a28cbc | 388 | monitor_child_postauth(struct monitor *pmonitor) |
1853d1ef | 389 | { |
3a39206f | 390 | monitor_set_child_handler(pmonitor->m_pid); |
391 | signal(SIGHUP, &monitor_child_handler); | |
392 | signal(SIGTERM, &monitor_child_handler); | |
393 | ||
1853d1ef | 394 | if (compat20) { |
395 | mon_dispatch = mon_dispatch_postauth20; | |
396 | ||
397 | /* Permit requests for moduli and signatures */ | |
398 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
399 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
400 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
1853d1ef | 401 | } else { |
402 | mon_dispatch = mon_dispatch_postauth15; | |
403 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
404 | } | |
405 | if (!no_pty_flag) { | |
406 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
407 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
408 | } | |
409 | ||
410 | for (;;) | |
b5a28cbc | 411 | monitor_read(pmonitor, mon_dispatch, NULL); |
1853d1ef | 412 | } |
413 | ||
414 | void | |
b5a28cbc | 415 | monitor_sync(struct monitor *pmonitor) |
1853d1ef | 416 | { |
0496cf34 | 417 | if (options.compression) { |
418 | /* The member allocation is not visible, so sync it */ | |
419 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
420 | } | |
1853d1ef | 421 | } |
422 | ||
423 | int | |
b5a28cbc | 424 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, |
1853d1ef | 425 | struct mon_table **pent) |
426 | { | |
427 | Buffer m; | |
428 | int ret; | |
429 | u_char type; | |
430 | ||
431 | buffer_init(&m); | |
432 | ||
b5a28cbc | 433 | mm_request_receive(pmonitor->m_sendfd, &m); |
1853d1ef | 434 | type = buffer_get_char(&m); |
435 | ||
1588c277 | 436 | debug3("%s: checking request %d", __func__, type); |
1853d1ef | 437 | |
438 | while (ent->f != NULL) { | |
439 | if (ent->type == type) | |
440 | break; | |
441 | ent++; | |
442 | } | |
443 | ||
444 | if (ent->f != NULL) { | |
445 | if (!(ent->flags & MON_PERMIT)) | |
1588c277 | 446 | fatal("%s: unpermitted request %d", __func__, |
1853d1ef | 447 | type); |
b5a28cbc | 448 | ret = (*ent->f)(pmonitor->m_sendfd, &m); |
1853d1ef | 449 | buffer_free(&m); |
450 | ||
451 | /* The child may use this request only once, disable it */ | |
452 | if (ent->flags & MON_ONCE) { | |
1588c277 | 453 | debug2("%s: %d used once, disabling now", __func__, |
1853d1ef | 454 | type); |
455 | ent->flags &= ~MON_PERMIT; | |
456 | } | |
457 | ||
458 | if (pent != NULL) | |
459 | *pent = ent; | |
460 | ||
461 | return ret; | |
462 | } | |
463 | ||
1588c277 | 464 | fatal("%s: unsupported request: %d", __func__, type); |
1853d1ef | 465 | |
466 | /* NOTREACHED */ | |
467 | return (-1); | |
468 | } | |
469 | ||
470 | /* allowed key state */ | |
471 | static int | |
472 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
473 | { | |
474 | /* make sure key is allowed */ | |
475 | if (key_blob == NULL || key_bloblen != bloblen || | |
476 | memcmp(key_blob, blob, key_bloblen)) | |
477 | return (0); | |
478 | return (1); | |
479 | } | |
480 | ||
481 | static void | |
482 | monitor_reset_key_state(void) | |
483 | { | |
484 | /* reset state */ | |
485 | if (key_blob != NULL) | |
486 | xfree(key_blob); | |
487 | if (hostbased_cuser != NULL) | |
488 | xfree(hostbased_cuser); | |
489 | if (hostbased_chost != NULL) | |
490 | xfree(hostbased_chost); | |
491 | key_blob = NULL; | |
492 | key_bloblen = 0; | |
493 | key_blobtype = MM_NOKEY; | |
494 | hostbased_cuser = NULL; | |
495 | hostbased_chost = NULL; | |
496 | } | |
497 | ||
498 | int | |
ca75d7de | 499 | mm_answer_moduli(int sock, Buffer *m) |
1853d1ef | 500 | { |
501 | DH *dh; | |
502 | int min, want, max; | |
503 | ||
504 | min = buffer_get_int(m); | |
505 | want = buffer_get_int(m); | |
506 | max = buffer_get_int(m); | |
507 | ||
508 | debug3("%s: got parameters: %d %d %d", | |
1588c277 | 509 | __func__, min, want, max); |
1853d1ef | 510 | /* We need to check here, too, in case the child got corrupted */ |
511 | if (max < min || want < min || max < want) | |
512 | fatal("%s: bad parameters: %d %d %d", | |
1588c277 | 513 | __func__, min, want, max); |
1853d1ef | 514 | |
515 | buffer_clear(m); | |
516 | ||
517 | dh = choose_dh(min, want, max); | |
518 | if (dh == NULL) { | |
519 | buffer_put_char(m, 0); | |
520 | return (0); | |
521 | } else { | |
522 | /* Send first bignum */ | |
523 | buffer_put_char(m, 1); | |
524 | buffer_put_bignum2(m, dh->p); | |
525 | buffer_put_bignum2(m, dh->g); | |
526 | ||
527 | DH_free(dh); | |
528 | } | |
ca75d7de | 529 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
1853d1ef | 530 | return (0); |
531 | } | |
532 | ||
533 | int | |
ca75d7de | 534 | mm_answer_sign(int sock, Buffer *m) |
1853d1ef | 535 | { |
536 | Key *key; | |
537 | u_char *p; | |
538 | u_char *signature; | |
539 | u_int siglen, datlen; | |
540 | int keyid; | |
541 | ||
1588c277 | 542 | debug3("%s", __func__); |
1853d1ef | 543 | |
544 | keyid = buffer_get_int(m); | |
545 | p = buffer_get_string(m, &datlen); | |
546 | ||
2ff8003a | 547 | /* |
b4bbf172 | 548 | * Supported KEX types will only return SHA1 (20 byte) or |
2ff8003a | 549 | * SHA256 (32 byte) hashes |
550 | */ | |
551 | if (datlen != 20 && datlen != 32) | |
d1ff09ba | 552 | fatal("%s: data length incorrect: %u", __func__, datlen); |
1853d1ef | 553 | |
521d606b | 554 | /* save session id, it will be passed on the first call */ |
555 | if (session_id2_len == 0) { | |
556 | session_id2_len = datlen; | |
557 | session_id2 = xmalloc(session_id2_len); | |
558 | memcpy(session_id2, p, session_id2_len); | |
559 | } | |
560 | ||
1853d1ef | 561 | if ((key = get_hostkey_by_index(keyid)) == NULL) |
1588c277 | 562 | fatal("%s: no hostkey from index %d", __func__, keyid); |
1853d1ef | 563 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
1588c277 | 564 | fatal("%s: key_sign failed", __func__); |
1853d1ef | 565 | |
d1ff09ba | 566 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
1853d1ef | 567 | |
568 | buffer_clear(m); | |
569 | buffer_put_string(m, signature, siglen); | |
570 | ||
571 | xfree(p); | |
572 | xfree(signature); | |
573 | ||
ca75d7de | 574 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
1853d1ef | 575 | |
576 | /* Turn on permissions for getpwnam */ | |
577 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
578 | ||
579 | return (0); | |
580 | } | |
581 | ||
582 | /* Retrieves the password entry and also checks if the user is permitted */ | |
583 | ||
584 | int | |
ca75d7de | 585 | mm_answer_pwnamallow(int sock, Buffer *m) |
1853d1ef | 586 | { |
18a8f313 | 587 | char *username; |
1853d1ef | 588 | struct passwd *pwent; |
589 | int allowed = 0; | |
590 | ||
1588c277 | 591 | debug3("%s", __func__); |
1853d1ef | 592 | |
593 | if (authctxt->attempt++ != 0) | |
1588c277 | 594 | fatal("%s: multiple attempts for getpwnam", __func__); |
1853d1ef | 595 | |
18a8f313 | 596 | username = buffer_get_string(m, NULL); |
1853d1ef | 597 | |
18a8f313 | 598 | pwent = getpwnamallow(username); |
1853d1ef | 599 | |
18a8f313 | 600 | authctxt->user = xstrdup(username); |
601 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
602 | xfree(username); | |
1853d1ef | 603 | |
604 | buffer_clear(m); | |
605 | ||
606 | if (pwent == NULL) { | |
607 | buffer_put_char(m, 0); | |
b2a5802b | 608 | authctxt->pw = fakepw(); |
1853d1ef | 609 | goto out; |
610 | } | |
611 | ||
612 | allowed = 1; | |
613 | authctxt->pw = pwent; | |
614 | authctxt->valid = 1; | |
615 | ||
616 | buffer_put_char(m, 1); | |
617 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
618 | buffer_put_cstring(m, pwent->pw_name); | |
619 | buffer_put_cstring(m, "*"); | |
620 | buffer_put_cstring(m, pwent->pw_gecos); | |
7b18c353 | 621 | #ifdef HAVE_PW_CLASS_IN_PASSWD |
1853d1ef | 622 | buffer_put_cstring(m, pwent->pw_class); |
7b18c353 | 623 | #endif |
1853d1ef | 624 | buffer_put_cstring(m, pwent->pw_dir); |
625 | buffer_put_cstring(m, pwent->pw_shell); | |
626 | ||
627 | out: | |
1588c277 | 628 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
ca75d7de | 629 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
1853d1ef | 630 | |
631 | /* For SSHv1 allow authentication now */ | |
632 | if (!compat20) | |
633 | monitor_permit_authentications(1); | |
94a73cdc | 634 | else { |
1853d1ef | 635 | /* Allow service/style information on the auth context */ |
636 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
94a73cdc | 637 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); |
638 | } | |
1853d1ef | 639 | |
efe44db6 | 640 | #ifdef USE_PAM |
7fceb20d | 641 | if (options.use_pam) |
642 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
efe44db6 | 643 | #endif |
6039eeef | 644 | #ifdef SSH_AUDIT_EVENTS |
d9bc3cde | 645 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); |
c00e4d75 | 646 | #endif |
1853d1ef | 647 | |
648 | return (0); | |
649 | } | |
650 | ||
ca75d7de | 651 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
94a73cdc | 652 | { |
653 | char *banner; | |
654 | ||
655 | buffer_clear(m); | |
656 | banner = auth2_read_banner(); | |
657 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
ca75d7de | 658 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
94a73cdc | 659 | |
660 | if (banner != NULL) | |
30e37ee6 | 661 | xfree(banner); |
94a73cdc | 662 | |
663 | return (0); | |
664 | } | |
665 | ||
1853d1ef | 666 | int |
ca75d7de | 667 | mm_answer_authserv(int sock, Buffer *m) |
1853d1ef | 668 | { |
669 | monitor_permit_authentications(1); | |
670 | ||
671 | authctxt->service = buffer_get_string(m, NULL); | |
672 | authctxt->style = buffer_get_string(m, NULL); | |
673 | debug3("%s: service=%s, style=%s", | |
1588c277 | 674 | __func__, authctxt->service, authctxt->style); |
1853d1ef | 675 | |
676 | if (strlen(authctxt->style) == 0) { | |
677 | xfree(authctxt->style); | |
678 | authctxt->style = NULL; | |
679 | } | |
680 | ||
681 | return (0); | |
682 | } | |
683 | ||
684 | int | |
ca75d7de | 685 | mm_answer_authpassword(int sock, Buffer *m) |
1853d1ef | 686 | { |
687 | static int call_count; | |
688 | char *passwd; | |
d341742a | 689 | int authenticated; |
690 | u_int plen; | |
1853d1ef | 691 | |
692 | passwd = buffer_get_string(m, &plen); | |
693 | /* Only authenticate if the context is valid */ | |
aa586f8e | 694 | authenticated = options.password_authentication && |
96d0bf74 | 695 | auth_password(authctxt, passwd); |
1853d1ef | 696 | memset(passwd, 0, strlen(passwd)); |
697 | xfree(passwd); | |
698 | ||
699 | buffer_clear(m); | |
700 | buffer_put_int(m, authenticated); | |
701 | ||
1588c277 | 702 | debug3("%s: sending result %d", __func__, authenticated); |
ca75d7de | 703 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
1853d1ef | 704 | |
705 | call_count++; | |
706 | if (plen == 0 && call_count == 1) | |
707 | auth_method = "none"; | |
708 | else | |
709 | auth_method = "password"; | |
710 | ||
711 | /* Causes monitor loop to terminate if authenticated */ | |
712 | return (authenticated); | |
713 | } | |
714 | ||
715 | #ifdef BSD_AUTH | |
716 | int | |
ca75d7de | 717 | mm_answer_bsdauthquery(int sock, Buffer *m) |
1853d1ef | 718 | { |
719 | char *name, *infotxt; | |
720 | u_int numprompts; | |
721 | u_int *echo_on; | |
722 | char **prompts; | |
6d6c25e3 | 723 | u_int success; |
1853d1ef | 724 | |
6d6c25e3 | 725 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
726 | &prompts, &echo_on) < 0 ? 0 : 1; | |
1853d1ef | 727 | |
728 | buffer_clear(m); | |
6d6c25e3 | 729 | buffer_put_int(m, success); |
730 | if (success) | |
1853d1ef | 731 | buffer_put_cstring(m, prompts[0]); |
732 | ||
6d6c25e3 | 733 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 734 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
1853d1ef | 735 | |
6d6c25e3 | 736 | if (success) { |
1853d1ef | 737 | xfree(name); |
738 | xfree(infotxt); | |
739 | xfree(prompts); | |
740 | xfree(echo_on); | |
741 | } | |
742 | ||
743 | return (0); | |
744 | } | |
745 | ||
746 | int | |
ca75d7de | 747 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
1853d1ef | 748 | { |
749 | char *response; | |
750 | int authok; | |
751 | ||
752 | if (authctxt->as == 0) | |
1588c277 | 753 | fatal("%s: no bsd auth session", __func__); |
1853d1ef | 754 | |
755 | response = buffer_get_string(m, NULL); | |
aa586f8e | 756 | authok = options.challenge_response_authentication && |
757 | auth_userresponse(authctxt->as, response, 0); | |
1853d1ef | 758 | authctxt->as = NULL; |
1588c277 | 759 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
1853d1ef | 760 | xfree(response); |
761 | ||
762 | buffer_clear(m); | |
763 | buffer_put_int(m, authok); | |
764 | ||
1588c277 | 765 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 766 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
1853d1ef | 767 | |
768 | auth_method = "bsdauth"; | |
769 | ||
770 | return (authok != 0); | |
771 | } | |
772 | #endif | |
773 | ||
774 | #ifdef SKEY | |
775 | int | |
ca75d7de | 776 | mm_answer_skeyquery(int sock, Buffer *m) |
1853d1ef | 777 | { |
778 | struct skey skey; | |
779 | char challenge[1024]; | |
6d6c25e3 | 780 | u_int success; |
1853d1ef | 781 | |
f2b7b5c8 | 782 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
783 | sizeof(challenge)) < 0 ? 0 : 1; | |
1853d1ef | 784 | |
785 | buffer_clear(m); | |
6d6c25e3 | 786 | buffer_put_int(m, success); |
787 | if (success) | |
1853d1ef | 788 | buffer_put_cstring(m, challenge); |
789 | ||
6d6c25e3 | 790 | debug3("%s: sending challenge success: %u", __func__, success); |
ca75d7de | 791 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
1853d1ef | 792 | |
793 | return (0); | |
794 | } | |
795 | ||
796 | int | |
ca75d7de | 797 | mm_answer_skeyrespond(int sock, Buffer *m) |
1853d1ef | 798 | { |
799 | char *response; | |
800 | int authok; | |
801 | ||
802 | response = buffer_get_string(m, NULL); | |
803 | ||
aa586f8e | 804 | authok = (options.challenge_response_authentication && |
805 | authctxt->valid && | |
1853d1ef | 806 | skey_haskey(authctxt->pw->pw_name) == 0 && |
807 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
808 | ||
809 | xfree(response); | |
810 | ||
811 | buffer_clear(m); | |
812 | buffer_put_int(m, authok); | |
813 | ||
1588c277 | 814 | debug3("%s: sending authenticated: %d", __func__, authok); |
ca75d7de | 815 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
1853d1ef | 816 | |
817 | auth_method = "skey"; | |
818 | ||
819 | return (authok != 0); | |
820 | } | |
821 | #endif | |
822 | ||
ad200abb | 823 | #ifdef USE_PAM |
824 | int | |
8b3ec5fd | 825 | mm_answer_pam_start(int sock, Buffer *m) |
ad200abb | 826 | { |
7fceb20d | 827 | if (!options.use_pam) |
828 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
829 | ||
529d73ab | 830 | start_pam(authctxt); |
ad200abb | 831 | |
5b9e2464 | 832 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
833 | ||
ad200abb | 834 | return (0); |
835 | } | |
05114c74 | 836 | |
5b9e2464 | 837 | int |
8b3ec5fd | 838 | mm_answer_pam_account(int sock, Buffer *m) |
5b9e2464 | 839 | { |
840 | u_int ret; | |
b6453d99 | 841 | |
5b9e2464 | 842 | if (!options.use_pam) |
843 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
844 | ||
845 | ret = do_pam_account(); | |
846 | ||
847 | buffer_put_int(m, ret); | |
cfb60d3a | 848 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
5b9e2464 | 849 | |
8b3ec5fd | 850 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
5b9e2464 | 851 | |
852 | return (ret); | |
853 | } | |
854 | ||
05114c74 | 855 | static void *sshpam_ctxt, *sshpam_authok; |
856 | extern KbdintDevice sshpam_device; | |
857 | ||
858 | int | |
8b3ec5fd | 859 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
05114c74 | 860 | { |
861 | ||
862 | debug3("%s", __func__); | |
863 | authctxt->user = buffer_get_string(m, NULL); | |
864 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
865 | sshpam_authok = NULL; | |
866 | buffer_clear(m); | |
867 | if (sshpam_ctxt != NULL) { | |
868 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
869 | buffer_put_int(m, 1); | |
870 | } else { | |
871 | buffer_put_int(m, 0); | |
872 | } | |
8b3ec5fd | 873 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
05114c74 | 874 | return (0); |
875 | } | |
876 | ||
877 | int | |
8b3ec5fd | 878 | mm_answer_pam_query(int sock, Buffer *m) |
05114c74 | 879 | { |
880 | char *name, *info, **prompts; | |
a1a073cc | 881 | u_int i, num, *echo_on; |
882 | int ret; | |
05114c74 | 883 | |
884 | debug3("%s", __func__); | |
885 | sshpam_authok = NULL; | |
886 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
887 | if (ret == 0 && num == 0) | |
888 | sshpam_authok = sshpam_ctxt; | |
889 | if (num > 1 || name == NULL || info == NULL) | |
890 | ret = -1; | |
891 | buffer_clear(m); | |
892 | buffer_put_int(m, ret); | |
893 | buffer_put_cstring(m, name); | |
894 | xfree(name); | |
895 | buffer_put_cstring(m, info); | |
896 | xfree(info); | |
897 | buffer_put_int(m, num); | |
898 | for (i = 0; i < num; ++i) { | |
899 | buffer_put_cstring(m, prompts[i]); | |
900 | xfree(prompts[i]); | |
901 | buffer_put_int(m, echo_on[i]); | |
902 | } | |
903 | if (prompts != NULL) | |
904 | xfree(prompts); | |
905 | if (echo_on != NULL) | |
906 | xfree(echo_on); | |
8b3ec5fd | 907 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
05114c74 | 908 | return (0); |
909 | } | |
910 | ||
911 | int | |
8b3ec5fd | 912 | mm_answer_pam_respond(int sock, Buffer *m) |
05114c74 | 913 | { |
914 | char **resp; | |
a1a073cc | 915 | u_int i, num; |
916 | int ret; | |
05114c74 | 917 | |
918 | debug3("%s", __func__); | |
919 | sshpam_authok = NULL; | |
920 | num = buffer_get_int(m); | |
921 | if (num > 0) { | |
922 | resp = xmalloc(num * sizeof(char *)); | |
923 | for (i = 0; i < num; ++i) | |
924 | resp[i] = buffer_get_string(m, NULL); | |
925 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
926 | for (i = 0; i < num; ++i) | |
927 | xfree(resp[i]); | |
928 | xfree(resp); | |
929 | } else { | |
930 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
931 | } | |
932 | buffer_clear(m); | |
933 | buffer_put_int(m, ret); | |
8b3ec5fd | 934 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
05114c74 | 935 | auth_method = "keyboard-interactive/pam"; |
936 | if (ret == 0) | |
937 | sshpam_authok = sshpam_ctxt; | |
938 | return (0); | |
939 | } | |
940 | ||
941 | int | |
8b3ec5fd | 942 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
05114c74 | 943 | { |
944 | ||
945 | debug3("%s", __func__); | |
946 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
947 | buffer_clear(m); | |
8b3ec5fd | 948 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
05114c74 | 949 | return (sshpam_authok == sshpam_ctxt); |
950 | } | |
ad200abb | 951 | #endif |
952 | ||
1853d1ef | 953 | static void |
954 | mm_append_debug(Buffer *m) | |
955 | { | |
956 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
1588c277 | 957 | debug3("%s: Appending debug messages for child", __func__); |
1853d1ef | 958 | buffer_append(m, buffer_ptr(&auth_debug), |
959 | buffer_len(&auth_debug)); | |
960 | buffer_clear(&auth_debug); | |
961 | } | |
962 | } | |
963 | ||
964 | int | |
ca75d7de | 965 | mm_answer_keyallowed(int sock, Buffer *m) |
1853d1ef | 966 | { |
967 | Key *key; | |
661e45a0 | 968 | char *cuser, *chost; |
969 | u_char *blob; | |
1853d1ef | 970 | u_int bloblen; |
971 | enum mm_keytype type = 0; | |
972 | int allowed = 0; | |
973 | ||
1588c277 | 974 | debug3("%s entering", __func__); |
1853d1ef | 975 | |
976 | type = buffer_get_int(m); | |
977 | cuser = buffer_get_string(m, NULL); | |
978 | chost = buffer_get_string(m, NULL); | |
979 | blob = buffer_get_string(m, &bloblen); | |
980 | ||
981 | key = key_from_blob(blob, bloblen); | |
982 | ||
983 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
984 | (!compat20 && type != MM_RSAHOSTKEY)) | |
1588c277 | 985 | fatal("%s: key type and protocol mismatch", __func__); |
1853d1ef | 986 | |
1588c277 | 987 | debug3("%s: key_from_blob: %p", __func__, key); |
1853d1ef | 988 | |
fdaef11e | 989 | if (key != NULL && authctxt->valid) { |
f8cc7664 | 990 | switch (type) { |
1853d1ef | 991 | case MM_USERKEY: |
aa586f8e | 992 | allowed = options.pubkey_authentication && |
993 | user_key_allowed(authctxt->pw, key); | |
1853d1ef | 994 | break; |
995 | case MM_HOSTKEY: | |
aa586f8e | 996 | allowed = options.hostbased_authentication && |
997 | hostbased_key_allowed(authctxt->pw, | |
1853d1ef | 998 | cuser, chost, key); |
999 | break; | |
1000 | case MM_RSAHOSTKEY: | |
1001 | key->type = KEY_RSA1; /* XXX */ | |
aa586f8e | 1002 | allowed = options.rhosts_rsa_authentication && |
1003 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
1853d1ef | 1004 | cuser, chost, key); |
1005 | break; | |
1006 | default: | |
1588c277 | 1007 | fatal("%s: unknown key type %d", __func__, type); |
1853d1ef | 1008 | break; |
1009 | } | |
1853d1ef | 1010 | } |
3e2f2431 | 1011 | if (key != NULL) |
1012 | key_free(key); | |
1853d1ef | 1013 | |
1014 | /* clear temporarily storage (used by verify) */ | |
1015 | monitor_reset_key_state(); | |
1016 | ||
1017 | if (allowed) { | |
1018 | /* Save temporarily for comparison in verify */ | |
1019 | key_blob = blob; | |
1020 | key_bloblen = bloblen; | |
1021 | key_blobtype = type; | |
1022 | hostbased_cuser = cuser; | |
1023 | hostbased_chost = chost; | |
98d40a74 | 1024 | } else { |
1025 | xfree(blob); | |
1026 | xfree(cuser); | |
1027 | xfree(chost); | |
1853d1ef | 1028 | } |
1029 | ||
1030 | debug3("%s: key %p is %s", | |
1588c277 | 1031 | __func__, key, allowed ? "allowed" : "disallowed"); |
1853d1ef | 1032 | |
1033 | buffer_clear(m); | |
1034 | buffer_put_int(m, allowed); | |
92e15201 | 1035 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1036 | |
1037 | mm_append_debug(m); | |
1038 | ||
ca75d7de | 1039 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
1853d1ef | 1040 | |
1041 | if (type == MM_RSAHOSTKEY) | |
1042 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1043 | ||
1044 | return (0); | |
1045 | } | |
1046 | ||
1047 | static int | |
1048 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1049 | { | |
1050 | Buffer b; | |
661e45a0 | 1051 | char *p; |
1853d1ef | 1052 | u_int len; |
1053 | int fail = 0; | |
1853d1ef | 1054 | |
1055 | buffer_init(&b); | |
1056 | buffer_append(&b, data, datalen); | |
1057 | ||
1058 | if (datafellows & SSH_OLD_SESSIONID) { | |
521d606b | 1059 | p = buffer_ptr(&b); |
1060 | len = buffer_len(&b); | |
1061 | if ((session_id2 == NULL) || | |
1062 | (len < session_id2_len) || | |
1063 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1064 | fail++; | |
1853d1ef | 1065 | buffer_consume(&b, session_id2_len); |
1066 | } else { | |
521d606b | 1067 | p = buffer_get_string(&b, &len); |
1068 | if ((session_id2 == NULL) || | |
1069 | (len != session_id2_len) || | |
1070 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1071 | fail++; |
521d606b | 1072 | xfree(p); |
1853d1ef | 1073 | } |
1074 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1075 | fail++; | |
1076 | p = buffer_get_string(&b, NULL); | |
1077 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1078 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1079 | authctxt->user, p); |
1080 | fail++; | |
1081 | } | |
1082 | xfree(p); | |
1083 | buffer_skip_string(&b); | |
1084 | if (datafellows & SSH_BUG_PKAUTH) { | |
1085 | if (!buffer_get_char(&b)) | |
1086 | fail++; | |
1087 | } else { | |
1088 | p = buffer_get_string(&b, NULL); | |
1089 | if (strcmp("publickey", p) != 0) | |
1090 | fail++; | |
1091 | xfree(p); | |
1092 | if (!buffer_get_char(&b)) | |
1093 | fail++; | |
1094 | buffer_skip_string(&b); | |
1095 | } | |
1096 | buffer_skip_string(&b); | |
1097 | if (buffer_len(&b) != 0) | |
1098 | fail++; | |
1099 | buffer_free(&b); | |
1100 | return (fail == 0); | |
1101 | } | |
1102 | ||
1103 | static int | |
661e45a0 | 1104 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1105 | char *chost) | |
1853d1ef | 1106 | { |
1107 | Buffer b; | |
661e45a0 | 1108 | char *p; |
1853d1ef | 1109 | u_int len; |
1110 | int fail = 0; | |
1853d1ef | 1111 | |
1112 | buffer_init(&b); | |
1113 | buffer_append(&b, data, datalen); | |
1114 | ||
521d606b | 1115 | p = buffer_get_string(&b, &len); |
1116 | if ((session_id2 == NULL) || | |
1117 | (len != session_id2_len) || | |
1118 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1853d1ef | 1119 | fail++; |
521d606b | 1120 | xfree(p); |
1121 | ||
1853d1ef | 1122 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1123 | fail++; | |
1124 | p = buffer_get_string(&b, NULL); | |
1125 | if (strcmp(authctxt->user, p) != 0) { | |
bbe88b6d | 1126 | logit("wrong user name passed to monitor: expected %s != %.100s", |
1853d1ef | 1127 | authctxt->user, p); |
1128 | fail++; | |
1129 | } | |
1130 | xfree(p); | |
1131 | buffer_skip_string(&b); /* service */ | |
1132 | p = buffer_get_string(&b, NULL); | |
1133 | if (strcmp(p, "hostbased") != 0) | |
1134 | fail++; | |
1135 | xfree(p); | |
1136 | buffer_skip_string(&b); /* pkalg */ | |
1137 | buffer_skip_string(&b); /* pkblob */ | |
1138 | ||
1139 | /* verify client host, strip trailing dot if necessary */ | |
1140 | p = buffer_get_string(&b, NULL); | |
1141 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1142 | p[len - 1] = '\0'; | |
1143 | if (strcmp(p, chost) != 0) | |
1144 | fail++; | |
1145 | xfree(p); | |
1146 | ||
1147 | /* verify client user */ | |
1148 | p = buffer_get_string(&b, NULL); | |
1149 | if (strcmp(p, cuser) != 0) | |
1150 | fail++; | |
1151 | xfree(p); | |
1152 | ||
1153 | if (buffer_len(&b) != 0) | |
1154 | fail++; | |
1155 | buffer_free(&b); | |
1156 | return (fail == 0); | |
1157 | } | |
1158 | ||
1159 | int | |
ca75d7de | 1160 | mm_answer_keyverify(int sock, Buffer *m) |
1853d1ef | 1161 | { |
1162 | Key *key; | |
1163 | u_char *signature, *data, *blob; | |
1164 | u_int signaturelen, datalen, bloblen; | |
1165 | int verified = 0; | |
1166 | int valid_data = 0; | |
1167 | ||
1168 | blob = buffer_get_string(m, &bloblen); | |
1169 | signature = buffer_get_string(m, &signaturelen); | |
1170 | data = buffer_get_string(m, &datalen); | |
1171 | ||
1172 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
300e01c4 | 1173 | !monitor_allowed_key(blob, bloblen)) |
1588c277 | 1174 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1175 | |
1176 | key = key_from_blob(blob, bloblen); | |
1177 | if (key == NULL) | |
1588c277 | 1178 | fatal("%s: bad public key blob", __func__); |
1853d1ef | 1179 | |
1180 | switch (key_blobtype) { | |
1181 | case MM_USERKEY: | |
1182 | valid_data = monitor_valid_userblob(data, datalen); | |
1183 | break; | |
1184 | case MM_HOSTKEY: | |
1185 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1186 | hostbased_cuser, hostbased_chost); | |
1187 | break; | |
1188 | default: | |
1189 | valid_data = 0; | |
1190 | break; | |
1191 | } | |
1192 | if (!valid_data) | |
1588c277 | 1193 | fatal("%s: bad signature data blob", __func__); |
1853d1ef | 1194 | |
1195 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1196 | debug3("%s: key %p signature %s", | |
1588c277 | 1197 | __func__, key, verified ? "verified" : "unverified"); |
1853d1ef | 1198 | |
1199 | key_free(key); | |
1200 | xfree(blob); | |
1201 | xfree(signature); | |
1202 | xfree(data); | |
1203 | ||
d17ef027 | 1204 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1205 | ||
1853d1ef | 1206 | monitor_reset_key_state(); |
1207 | ||
1208 | buffer_clear(m); | |
1209 | buffer_put_int(m, verified); | |
ca75d7de | 1210 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
1853d1ef | 1211 | |
1853d1ef | 1212 | return (verified); |
1213 | } | |
1214 | ||
1215 | static void | |
1216 | mm_record_login(Session *s, struct passwd *pw) | |
1217 | { | |
1218 | socklen_t fromlen; | |
1219 | struct sockaddr_storage from; | |
1220 | ||
1221 | /* | |
1222 | * Get IP address of client. If the connection is not a socket, let | |
1223 | * the address be 0.0.0.0. | |
1224 | */ | |
1225 | memset(&from, 0, sizeof(from)); | |
ba1566dd | 1226 | fromlen = sizeof(from); |
1853d1ef | 1227 | if (packet_connection_is_on_socket()) { |
1853d1ef | 1228 | if (getpeername(packet_get_connection_in(), |
b248a875 | 1229 | (struct sockaddr *)&from, &fromlen) < 0) { |
1853d1ef | 1230 | debug("getpeername: %.100s", strerror(errno)); |
2362db19 | 1231 | cleanup_exit(255); |
1853d1ef | 1232 | } |
1233 | } | |
1234 | /* Record that there was a login on that tty from the remote host. */ | |
1235 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
c5a7d788 | 1236 | get_remote_name_or_ip(utmp_len, options.use_dns), |
ba1566dd | 1237 | (struct sockaddr *)&from, fromlen); |
1853d1ef | 1238 | } |
1239 | ||
1240 | static void | |
1241 | mm_session_close(Session *s) | |
1242 | { | |
b9ed513a | 1243 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
1853d1ef | 1244 | if (s->ttyfd != -1) { |
1588c277 | 1245 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
1853d1ef | 1246 | session_pty_cleanup2(s); |
1247 | } | |
1248 | s->used = 0; | |
1249 | } | |
1250 | ||
1251 | int | |
ca75d7de | 1252 | mm_answer_pty(int sock, Buffer *m) |
1853d1ef | 1253 | { |
b5a28cbc | 1254 | extern struct monitor *pmonitor; |
1853d1ef | 1255 | Session *s; |
1256 | int res, fd0; | |
1257 | ||
1588c277 | 1258 | debug3("%s entering", __func__); |
1853d1ef | 1259 | |
1260 | buffer_clear(m); | |
1261 | s = session_new(); | |
1262 | if (s == NULL) | |
1263 | goto error; | |
1264 | s->authctxt = authctxt; | |
1265 | s->pw = authctxt->pw; | |
b5a28cbc | 1266 | s->pid = pmonitor->m_pid; |
1853d1ef | 1267 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); |
1268 | if (res == 0) | |
1269 | goto error; | |
1853d1ef | 1270 | pty_setowner(authctxt->pw, s->tty); |
1271 | ||
1272 | buffer_put_int(m, 1); | |
1273 | buffer_put_cstring(m, s->tty); | |
1853d1ef | 1274 | |
1275 | /* We need to trick ttyslot */ | |
1276 | if (dup2(s->ttyfd, 0) == -1) | |
1588c277 | 1277 | fatal("%s: dup2", __func__); |
1853d1ef | 1278 | |
1279 | mm_record_login(s, authctxt->pw); | |
1280 | ||
1281 | /* Now we can close the file descriptor again */ | |
1282 | close(0); | |
1283 | ||
be2ca0c9 | 1284 | /* send messages generated by record_login */ |
1285 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1286 | buffer_clear(&loginmsg); | |
1287 | ||
1288 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1289 | ||
1290 | mm_send_fd(sock, s->ptyfd); | |
1291 | mm_send_fd(sock, s->ttyfd); | |
1292 | ||
1853d1ef | 1293 | /* make sure nothing uses fd 0 */ |
1294 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
1588c277 | 1295 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
1853d1ef | 1296 | if (fd0 != 0) |
1588c277 | 1297 | error("%s: fd0 %d != 0", __func__, fd0); |
1853d1ef | 1298 | |
1299 | /* slave is not needed */ | |
1300 | close(s->ttyfd); | |
1301 | s->ttyfd = s->ptyfd; | |
1302 | /* no need to dup() because nobody closes ptyfd */ | |
1303 | s->ptymaster = s->ptyfd; | |
1304 | ||
1588c277 | 1305 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
1853d1ef | 1306 | |
1307 | return (0); | |
1308 | ||
1309 | error: | |
1310 | if (s != NULL) | |
1311 | mm_session_close(s); | |
1312 | buffer_put_int(m, 0); | |
ca75d7de | 1313 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
1853d1ef | 1314 | return (0); |
1315 | } | |
1316 | ||
1317 | int | |
ca75d7de | 1318 | mm_answer_pty_cleanup(int sock, Buffer *m) |
1853d1ef | 1319 | { |
1320 | Session *s; | |
1321 | char *tty; | |
1322 | ||
1588c277 | 1323 | debug3("%s entering", __func__); |
1853d1ef | 1324 | |
1325 | tty = buffer_get_string(m, NULL); | |
1326 | if ((s = session_by_tty(tty)) != NULL) | |
1327 | mm_session_close(s); | |
1328 | buffer_clear(m); | |
1329 | xfree(tty); | |
1330 | return (0); | |
1331 | } | |
1332 | ||
1333 | int | |
ca75d7de | 1334 | mm_answer_sesskey(int sock, Buffer *m) |
1853d1ef | 1335 | { |
1336 | BIGNUM *p; | |
1337 | int rsafail; | |
1338 | ||
1339 | /* Turn off permissions */ | |
75cccc2c | 1340 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
1853d1ef | 1341 | |
1342 | if ((p = BN_new()) == NULL) | |
1588c277 | 1343 | fatal("%s: BN_new", __func__); |
1853d1ef | 1344 | |
1345 | buffer_get_bignum2(m, p); | |
1346 | ||
1347 | rsafail = ssh1_session_key(p); | |
1348 | ||
1349 | buffer_clear(m); | |
1350 | buffer_put_int(m, rsafail); | |
1351 | buffer_put_bignum2(m, p); | |
1352 | ||
1353 | BN_clear_free(p); | |
1354 | ||
ca75d7de | 1355 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
1853d1ef | 1356 | |
1357 | /* Turn on permissions for sessid passing */ | |
1358 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1359 | ||
1360 | return (0); | |
1361 | } | |
1362 | ||
1363 | int | |
ca75d7de | 1364 | mm_answer_sessid(int sock, Buffer *m) |
1853d1ef | 1365 | { |
1366 | int i; | |
1367 | ||
1588c277 | 1368 | debug3("%s entering", __func__); |
1853d1ef | 1369 | |
1370 | if (buffer_len(m) != 16) | |
1588c277 | 1371 | fatal("%s: bad ssh1 session id", __func__); |
1853d1ef | 1372 | for (i = 0; i < 16; i++) |
1373 | session_id[i] = buffer_get_char(m); | |
1374 | ||
1375 | /* Turn on permissions for getpwnam */ | |
1376 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1377 | ||
1378 | return (0); | |
1379 | } | |
1380 | ||
1381 | int | |
ca75d7de | 1382 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
1853d1ef | 1383 | { |
1384 | BIGNUM *client_n; | |
1385 | Key *key = NULL; | |
1386 | u_char *blob = NULL; | |
1387 | u_int blen = 0; | |
1388 | int allowed = 0; | |
1389 | ||
1588c277 | 1390 | debug3("%s entering", __func__); |
1853d1ef | 1391 | |
aa586f8e | 1392 | if (options.rsa_authentication && authctxt->valid) { |
1853d1ef | 1393 | if ((client_n = BN_new()) == NULL) |
1588c277 | 1394 | fatal("%s: BN_new", __func__); |
1853d1ef | 1395 | buffer_get_bignum2(m, client_n); |
1396 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1397 | BN_clear_free(client_n); | |
1398 | } | |
1399 | buffer_clear(m); | |
1400 | buffer_put_int(m, allowed); | |
92e15201 | 1401 | buffer_put_int(m, forced_command != NULL); |
1853d1ef | 1402 | |
1403 | /* clear temporarily storage (used by generate challenge) */ | |
1404 | monitor_reset_key_state(); | |
1405 | ||
1406 | if (allowed && key != NULL) { | |
1407 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1408 | if (key_to_blob(key, &blob, &blen) == 0) | |
1588c277 | 1409 | fatal("%s: key_to_blob failed", __func__); |
1853d1ef | 1410 | buffer_put_string(m, blob, blen); |
1411 | ||
1412 | /* Save temporarily for comparison in verify */ | |
1413 | key_blob = blob; | |
1414 | key_bloblen = blen; | |
1415 | key_blobtype = MM_RSAUSERKEY; | |
1853d1ef | 1416 | } |
3e2f2431 | 1417 | if (key != NULL) |
1418 | key_free(key); | |
1853d1ef | 1419 | |
1420 | mm_append_debug(m); | |
1421 | ||
ca75d7de | 1422 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
1853d1ef | 1423 | |
1424 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1425 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1426 | return (0); | |
1427 | } | |
1428 | ||
1429 | int | |
ca75d7de | 1430 | mm_answer_rsa_challenge(int sock, Buffer *m) |
1853d1ef | 1431 | { |
1432 | Key *key = NULL; | |
1433 | u_char *blob; | |
1434 | u_int blen; | |
1435 | ||
1588c277 | 1436 | debug3("%s entering", __func__); |
1853d1ef | 1437 | |
1438 | if (!authctxt->valid) | |
1588c277 | 1439 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1440 | blob = buffer_get_string(m, &blen); |
1441 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1442 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1443 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1444 | fatal("%s: key type mismatch", __func__); |
1853d1ef | 1445 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1446 | fatal("%s: received bad key", __func__); |
1853d1ef | 1447 | |
1448 | if (ssh1_challenge) | |
1449 | BN_clear_free(ssh1_challenge); | |
1450 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1451 | ||
1452 | buffer_clear(m); | |
1453 | buffer_put_bignum2(m, ssh1_challenge); | |
1454 | ||
1588c277 | 1455 | debug3("%s sending reply", __func__); |
ca75d7de | 1456 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
1853d1ef | 1457 | |
1458 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
3e2f2431 | 1459 | |
1460 | xfree(blob); | |
1461 | key_free(key); | |
1853d1ef | 1462 | return (0); |
1463 | } | |
1464 | ||
1465 | int | |
ca75d7de | 1466 | mm_answer_rsa_response(int sock, Buffer *m) |
1853d1ef | 1467 | { |
1468 | Key *key = NULL; | |
1469 | u_char *blob, *response; | |
1470 | u_int blen, len; | |
1471 | int success; | |
1472 | ||
1588c277 | 1473 | debug3("%s entering", __func__); |
1853d1ef | 1474 | |
1475 | if (!authctxt->valid) | |
1588c277 | 1476 | fatal("%s: authctxt not valid", __func__); |
1853d1ef | 1477 | if (ssh1_challenge == NULL) |
1588c277 | 1478 | fatal("%s: no ssh1_challenge", __func__); |
1853d1ef | 1479 | |
1480 | blob = buffer_get_string(m, &blen); | |
1481 | if (!monitor_allowed_key(blob, blen)) | |
1588c277 | 1482 | fatal("%s: bad key, not previously allowed", __func__); |
1853d1ef | 1483 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
1588c277 | 1484 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
1853d1ef | 1485 | if ((key = key_from_blob(blob, blen)) == NULL) |
1588c277 | 1486 | fatal("%s: received bad key", __func__); |
1853d1ef | 1487 | response = buffer_get_string(m, &len); |
1488 | if (len != 16) | |
1588c277 | 1489 | fatal("%s: received bad response to challenge", __func__); |
1853d1ef | 1490 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1491 | ||
3e2f2431 | 1492 | xfree(blob); |
1853d1ef | 1493 | key_free(key); |
1494 | xfree(response); | |
1495 | ||
1496 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1497 | ||
1498 | /* reset state */ | |
1499 | BN_clear_free(ssh1_challenge); | |
1500 | ssh1_challenge = NULL; | |
1501 | monitor_reset_key_state(); | |
1502 | ||
1503 | buffer_clear(m); | |
1504 | buffer_put_int(m, success); | |
ca75d7de | 1505 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
1853d1ef | 1506 | |
1507 | return (success); | |
1508 | } | |
1509 | ||
1510 | int | |
ca75d7de | 1511 | mm_answer_term(int sock, Buffer *req) |
1853d1ef | 1512 | { |
b5a28cbc | 1513 | extern struct monitor *pmonitor; |
1853d1ef | 1514 | int res, status; |
1515 | ||
1588c277 | 1516 | debug3("%s: tearing down sessions", __func__); |
1853d1ef | 1517 | |
1518 | /* The child is terminating */ | |
1519 | session_destroy_all(&mm_session_close); | |
1520 | ||
b5a28cbc | 1521 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
8c38e88b | 1522 | if (errno != EINTR) |
1523 | exit(1); | |
1853d1ef | 1524 | |
1525 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1526 | ||
1527 | /* Terminate process */ | |
f6be21a0 | 1528 | exit(res); |
1853d1ef | 1529 | } |
1530 | ||
6039eeef | 1531 | #ifdef SSH_AUDIT_EVENTS |
c00e4d75 | 1532 | /* Report that an audit event occurred */ |
1533 | int | |
1534 | mm_answer_audit_event(int socket, Buffer *m) | |
1535 | { | |
1536 | ssh_audit_event_t event; | |
1537 | ||
1538 | debug3("%s entering", __func__); | |
1539 | ||
1540 | event = buffer_get_int(m); | |
c00e4d75 | 1541 | switch(event) { |
6039eeef | 1542 | case SSH_AUTH_FAIL_PUBKEY: |
1543 | case SSH_AUTH_FAIL_HOSTBASED: | |
1544 | case SSH_AUTH_FAIL_GSSAPI: | |
1545 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1546 | case SSH_LOGIN_ROOT_DENIED: | |
1547 | case SSH_CONNECTION_CLOSE: | |
1548 | case SSH_INVALID_USER: | |
c00e4d75 | 1549 | audit_event(event); |
1550 | break; | |
1551 | default: | |
1552 | fatal("Audit event type %d not permitted", event); | |
1553 | } | |
1554 | ||
1555 | return (0); | |
1556 | } | |
1557 | ||
1558 | int | |
1559 | mm_answer_audit_command(int socket, Buffer *m) | |
1560 | { | |
1561 | u_int len; | |
1562 | char *cmd; | |
1563 | ||
1564 | debug3("%s entering", __func__); | |
1565 | cmd = buffer_get_string(m, &len); | |
1566 | /* sanity check command, if so how? */ | |
1567 | audit_run_command(cmd); | |
1568 | xfree(cmd); | |
c00e4d75 | 1569 | return (0); |
1570 | } | |
6039eeef | 1571 | #endif /* SSH_AUDIT_EVENTS */ |
c00e4d75 | 1572 | |
1853d1ef | 1573 | void |
b5a28cbc | 1574 | monitor_apply_keystate(struct monitor *pmonitor) |
1853d1ef | 1575 | { |
1576 | if (compat20) { | |
1577 | set_newkeys(MODE_IN); | |
1578 | set_newkeys(MODE_OUT); | |
1579 | } else { | |
1853d1ef | 1580 | packet_set_protocol_flags(child_state.ssh1protoflags); |
9459414c | 1581 | packet_set_encryption_key(child_state.ssh1key, |
1582 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1583 | xfree(child_state.ssh1key); | |
1853d1ef | 1584 | } |
1585 | ||
9459414c | 1586 | /* for rc4 and other stateful ciphers */ |
1853d1ef | 1587 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1588 | xfree(child_state.keyout); | |
1589 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1590 | xfree(child_state.keyin); | |
1591 | ||
1592 | if (!compat20) { | |
1593 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1594 | xfree(child_state.ivout); | |
1595 | packet_set_iv(MODE_IN, child_state.ivin); | |
1596 | xfree(child_state.ivin); | |
1597 | } | |
1598 | ||
1599 | memcpy(&incoming_stream, &child_state.incoming, | |
1600 | sizeof(incoming_stream)); | |
1601 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1602 | sizeof(outgoing_stream)); | |
1603 | ||
1604 | /* Update with new address */ | |
0496cf34 | 1605 | if (options.compression) |
1606 | mm_init_compression(pmonitor->m_zlib); | |
1853d1ef | 1607 | |
1608 | /* Network I/O buffers */ | |
1609 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1610 | buffer_clear(&input); | |
1611 | buffer_append(&input, child_state.input, child_state.ilen); | |
1612 | memset(child_state.input, 0, child_state.ilen); | |
1613 | xfree(child_state.input); | |
1614 | ||
1615 | buffer_clear(&output); | |
1616 | buffer_append(&output, child_state.output, child_state.olen); | |
1617 | memset(child_state.output, 0, child_state.olen); | |
1618 | xfree(child_state.output); | |
1619 | } | |
1620 | ||
1621 | static Kex * | |
1622 | mm_get_kex(Buffer *m) | |
1623 | { | |
1624 | Kex *kex; | |
1625 | void *blob; | |
1626 | u_int bloblen; | |
1627 | ||
1628 | kex = xmalloc(sizeof(*kex)); | |
1629 | memset(kex, 0, sizeof(*kex)); | |
1630 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
521d606b | 1631 | if ((session_id2 == NULL) || |
1632 | (kex->session_id_len != session_id2_len) || | |
1633 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1634 | fatal("mm_get_get: internal error: bad session id"); | |
1853d1ef | 1635 | kex->we_need = buffer_get_int(m); |
cdb64c4d | 1636 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
41e5bd9a | 1637 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
cdb64c4d | 1638 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
2ff8003a | 1639 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
1853d1ef | 1640 | kex->server = 1; |
1641 | kex->hostkey_type = buffer_get_int(m); | |
1642 | kex->kex_type = buffer_get_int(m); | |
1643 | blob = buffer_get_string(m, &bloblen); | |
1644 | buffer_init(&kex->my); | |
1645 | buffer_append(&kex->my, blob, bloblen); | |
1646 | xfree(blob); | |
1647 | blob = buffer_get_string(m, &bloblen); | |
1648 | buffer_init(&kex->peer); | |
1649 | buffer_append(&kex->peer, blob, bloblen); | |
1650 | xfree(blob); | |
1651 | kex->done = 1; | |
1652 | kex->flags = buffer_get_int(m); | |
1653 | kex->client_version_string = buffer_get_string(m, NULL); | |
1654 | kex->server_version_string = buffer_get_string(m, NULL); | |
1655 | kex->load_host_key=&get_hostkey_by_type; | |
1656 | kex->host_key_index=&get_hostkey_index; | |
1657 | ||
1658 | return (kex); | |
1659 | } | |
1660 | ||
1661 | /* This function requries careful sanity checking */ | |
1662 | ||
1663 | void | |
b5a28cbc | 1664 | mm_get_keystate(struct monitor *pmonitor) |
1853d1ef | 1665 | { |
1666 | Buffer m; | |
1667 | u_char *blob, *p; | |
1668 | u_int bloblen, plen; | |
ffd7b36b | 1669 | u_int32_t seqnr, packets; |
1670 | u_int64_t blocks; | |
1853d1ef | 1671 | |
1588c277 | 1672 | debug3("%s: Waiting for new keys", __func__); |
1853d1ef | 1673 | |
1674 | buffer_init(&m); | |
b5a28cbc | 1675 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); |
1853d1ef | 1676 | if (!compat20) { |
1677 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1678 | child_state.ssh1cipher = buffer_get_int(&m); | |
9459414c | 1679 | child_state.ssh1key = buffer_get_string(&m, |
1680 | &child_state.ssh1keylen); | |
1853d1ef | 1681 | child_state.ivout = buffer_get_string(&m, |
1682 | &child_state.ivoutlen); | |
1683 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1684 | goto skip; | |
1685 | } else { | |
1686 | /* Get the Kex for rekeying */ | |
b5a28cbc | 1687 | *pmonitor->m_pkex = mm_get_kex(&m); |
1853d1ef | 1688 | } |
1689 | ||
1690 | blob = buffer_get_string(&m, &bloblen); | |
1691 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1692 | xfree(blob); | |
1693 | ||
1588c277 | 1694 | debug3("%s: Waiting for second key", __func__); |
1853d1ef | 1695 | blob = buffer_get_string(&m, &bloblen); |
1696 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1697 | xfree(blob); | |
1698 | ||
1699 | /* Now get sequence numbers for the packets */ | |
ffd7b36b | 1700 | seqnr = buffer_get_int(&m); |
1701 | blocks = buffer_get_int64(&m); | |
1702 | packets = buffer_get_int(&m); | |
1703 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1704 | seqnr = buffer_get_int(&m); | |
1705 | blocks = buffer_get_int64(&m); | |
1706 | packets = buffer_get_int(&m); | |
1707 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
1853d1ef | 1708 | |
1709 | skip: | |
1710 | /* Get the key context */ | |
1711 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1712 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1713 | ||
1588c277 | 1714 | debug3("%s: Getting compression state", __func__); |
1853d1ef | 1715 | /* Get compression state */ |
1716 | p = buffer_get_string(&m, &plen); | |
1717 | if (plen != sizeof(child_state.outgoing)) | |
1588c277 | 1718 | fatal("%s: bad request size", __func__); |
1853d1ef | 1719 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1720 | xfree(p); | |
1721 | ||
1722 | p = buffer_get_string(&m, &plen); | |
1723 | if (plen != sizeof(child_state.incoming)) | |
1588c277 | 1724 | fatal("%s: bad request size", __func__); |
1853d1ef | 1725 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1726 | xfree(p); | |
1727 | ||
1728 | /* Network I/O buffers */ | |
1588c277 | 1729 | debug3("%s: Getting Network I/O buffers", __func__); |
1853d1ef | 1730 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1731 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1732 | ||
1733 | buffer_free(&m); | |
1734 | } | |
1735 | ||
1736 | ||
1737 | /* Allocation functions for zlib */ | |
1738 | void * | |
1739 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1740 | { | |
39e71188 | 1741 | size_t len = (size_t) size * ncount; |
1853d1ef | 1742 | void *address; |
1743 | ||
b85698ab | 1744 | if (len == 0 || ncount > SIZE_T_MAX / size) |
2f095a0e | 1745 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1746 | ||
1747 | address = mm_malloc(mm, len); | |
1853d1ef | 1748 | |
1749 | return (address); | |
1750 | } | |
1751 | ||
1752 | void | |
1753 | mm_zfree(struct mm_master *mm, void *address) | |
1754 | { | |
1755 | mm_free(mm, address); | |
1756 | } | |
1757 | ||
1758 | void | |
1759 | mm_init_compression(struct mm_master *mm) | |
1760 | { | |
1761 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1762 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1763 | outgoing_stream.opaque = mm; | |
1764 | ||
1765 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1766 | incoming_stream.zfree = (free_func)mm_zfree; | |
1767 | incoming_stream.opaque = mm; | |
1768 | } | |
1769 | ||
1770 | /* XXX */ | |
1771 | ||
1772 | #define FD_CLOSEONEXEC(x) do { \ | |
1773 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1774 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1775 | } while (0) | |
1776 | ||
1777 | static void | |
1778 | monitor_socketpair(int *pair) | |
1779 | { | |
f1af2dbf | 1780 | #ifdef HAVE_SOCKETPAIR |
1853d1ef | 1781 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) |
1588c277 | 1782 | fatal("%s: socketpair", __func__); |
f1af2dbf | 1783 | #else |
1784 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
1588c277 | 1785 | __func__); |
f1af2dbf | 1786 | #endif |
1853d1ef | 1787 | FD_CLOSEONEXEC(pair[0]); |
1788 | FD_CLOSEONEXEC(pair[1]); | |
1789 | } | |
1790 | ||
1791 | #define MM_MEMSIZE 65536 | |
1792 | ||
1793 | struct monitor * | |
1794 | monitor_init(void) | |
1795 | { | |
1796 | struct monitor *mon; | |
1797 | int pair[2]; | |
1798 | ||
1799 | mon = xmalloc(sizeof(*mon)); | |
1800 | ||
a9b33b95 | 1801 | mon->m_pid = 0; |
1853d1ef | 1802 | monitor_socketpair(pair); |
1803 | ||
1804 | mon->m_recvfd = pair[0]; | |
1805 | mon->m_sendfd = pair[1]; | |
1806 | ||
1807 | /* Used to share zlib space across processes */ | |
0496cf34 | 1808 | if (options.compression) { |
1809 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1810 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
1853d1ef | 1811 | |
0496cf34 | 1812 | /* Compression needs to share state across borders */ |
1813 | mm_init_compression(mon->m_zlib); | |
1814 | } | |
1853d1ef | 1815 | |
1816 | return mon; | |
1817 | } | |
1818 | ||
1819 | void | |
1820 | monitor_reinit(struct monitor *mon) | |
1821 | { | |
1822 | int pair[2]; | |
1823 | ||
1824 | monitor_socketpair(pair); | |
1825 | ||
1826 | mon->m_recvfd = pair[0]; | |
1827 | mon->m_sendfd = pair[1]; | |
1828 | } | |
7364bd04 | 1829 | |
1830 | #ifdef GSSAPI | |
1831 | int | |
ca75d7de | 1832 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7364bd04 | 1833 | { |
ca75d7de | 1834 | gss_OID_desc goid; |
7364bd04 | 1835 | OM_uint32 major; |
1836 | u_int len; | |
1837 | ||
ca75d7de | 1838 | goid.elements = buffer_get_string(m, &len); |
1839 | goid.length = len; | |
7364bd04 | 1840 | |
ca75d7de | 1841 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
7364bd04 | 1842 | |
ca75d7de | 1843 | xfree(goid.elements); |
7364bd04 | 1844 | |
1845 | buffer_clear(m); | |
1846 | buffer_put_int(m, major); | |
1847 | ||
8442cc66 | 1848 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7364bd04 | 1849 | |
1850 | /* Now we have a context, enable the step */ | |
1851 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1852 | ||
1853 | return (0); | |
1854 | } | |
1855 | ||
1856 | int | |
ca75d7de | 1857 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7364bd04 | 1858 | { |
1859 | gss_buffer_desc in; | |
1860 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
8442cc66 | 1861 | OM_uint32 major, minor; |
7364bd04 | 1862 | OM_uint32 flags = 0; /* GSI needs this */ |
f99e1ca4 | 1863 | u_int len; |
7364bd04 | 1864 | |
f99e1ca4 | 1865 | in.value = buffer_get_string(m, &len); |
1866 | in.length = len; | |
7364bd04 | 1867 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); |
1868 | xfree(in.value); | |
1869 | ||
1870 | buffer_clear(m); | |
1871 | buffer_put_int(m, major); | |
1872 | buffer_put_string(m, out.value, out.length); | |
1873 | buffer_put_int(m, flags); | |
ca75d7de | 1874 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
7364bd04 | 1875 | |
1876 | gss_release_buffer(&minor, &out); | |
1877 | ||
8442cc66 | 1878 | if (major == GSS_S_COMPLETE) { |
7364bd04 | 1879 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1880 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
0789992b | 1881 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
7364bd04 | 1882 | } |
1883 | return (0); | |
1884 | } | |
1885 | ||
0789992b | 1886 | int |
ca75d7de | 1887 | mm_answer_gss_checkmic(int sock, Buffer *m) |
0789992b | 1888 | { |
1889 | gss_buffer_desc gssbuf, mic; | |
1890 | OM_uint32 ret; | |
1891 | u_int len; | |
b6453d99 | 1892 | |
0789992b | 1893 | gssbuf.value = buffer_get_string(m, &len); |
1894 | gssbuf.length = len; | |
1895 | mic.value = buffer_get_string(m, &len); | |
1896 | mic.length = len; | |
b6453d99 | 1897 | |
0789992b | 1898 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); |
b6453d99 | 1899 | |
0789992b | 1900 | xfree(gssbuf.value); |
1901 | xfree(mic.value); | |
b6453d99 | 1902 | |
0789992b | 1903 | buffer_clear(m); |
1904 | buffer_put_int(m, ret); | |
b6453d99 | 1905 | |
ca75d7de | 1906 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
b6453d99 | 1907 | |
0789992b | 1908 | if (!GSS_ERROR(ret)) |
1909 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
b6453d99 | 1910 | |
0789992b | 1911 | return (0); |
1912 | } | |
1913 | ||
7364bd04 | 1914 | int |
ca75d7de | 1915 | mm_answer_gss_userok(int sock, Buffer *m) |
7364bd04 | 1916 | { |
1917 | int authenticated; | |
1918 | ||
1919 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); | |
1920 | ||
1921 | buffer_clear(m); | |
1922 | buffer_put_int(m, authenticated); | |
1923 | ||
1924 | debug3("%s: sending result %d", __func__, authenticated); | |
ca75d7de | 1925 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
7364bd04 | 1926 | |
8442cc66 | 1927 | auth_method = "gssapi-with-mic"; |
7364bd04 | 1928 | |
1929 | /* Monitor loop will terminate if authenticated */ | |
1930 | return (authenticated); | |
1931 | } | |
1932 | #endif /* GSSAPI */ |