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826f3a39 | 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" | |
dfddba3d | 28 | RCSID("$OpenBSD: monitor.c,v 1.62 2005/01/30 11:18:08 dtucker Exp $"); |
826f3a39 | 29 | |
30 | #include <openssl/dh.h> | |
31 | ||
32 | #ifdef SKEY | |
33 | #include <skey.h> | |
34 | #endif | |
35 | ||
36 | #include "ssh.h" | |
37 | #include "auth.h" | |
38 | #include "kex.h" | |
39 | #include "dh.h" | |
12a403af | 40 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
41 | #undef TARGET_OS_MAC | |
826f3a39 | 42 | #include "zlib.h" |
12a403af | 43 | #define TARGET_OS_MAC 1 |
44 | #else | |
45 | #include "zlib.h" | |
46 | #endif | |
826f3a39 | 47 | #include "packet.h" |
48 | #include "auth-options.h" | |
49 | #include "sshpty.h" | |
50 | #include "channels.h" | |
51 | #include "session.h" | |
52 | #include "sshlogin.h" | |
53 | #include "canohost.h" | |
54 | #include "log.h" | |
55 | #include "servconf.h" | |
56 | #include "monitor.h" | |
57 | #include "monitor_mm.h" | |
58 | #include "monitor_wrap.h" | |
59 | #include "monitor_fdpass.h" | |
60 | #include "xmalloc.h" | |
61 | #include "misc.h" | |
62 | #include "buffer.h" | |
63 | #include "bufaux.h" | |
64 | #include "compat.h" | |
65 | #include "ssh2.h" | |
826f3a39 | 66 | |
b59afbfe | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | static Gssctxt *gsscontext = NULL; | |
70 | #endif | |
71 | ||
826f3a39 | 72 | /* Imports */ |
73 | extern ServerOptions options; | |
74 | extern u_int utmp_len; | |
75 | extern Newkeys *current_keys[]; | |
76 | extern z_stream incoming_stream; | |
77 | extern z_stream outgoing_stream; | |
78 | extern u_char session_id[]; | |
79 | extern Buffer input, output; | |
80 | extern Buffer auth_debug; | |
81 | extern int auth_debug_init; | |
7e82606e | 82 | extern Buffer loginmsg; |
826f3a39 | 83 | |
84 | /* State exported from the child */ | |
85 | ||
86 | struct { | |
87 | z_stream incoming; | |
88 | z_stream outgoing; | |
89 | u_char *keyin; | |
90 | u_int keyinlen; | |
91 | u_char *keyout; | |
92 | u_int keyoutlen; | |
93 | u_char *ivin; | |
94 | u_int ivinlen; | |
95 | u_char *ivout; | |
96 | u_int ivoutlen; | |
44a053a3 | 97 | u_char *ssh1key; |
98 | u_int ssh1keylen; | |
826f3a39 | 99 | int ssh1cipher; |
100 | int ssh1protoflags; | |
101 | u_char *input; | |
102 | u_int ilen; | |
103 | u_char *output; | |
104 | u_int olen; | |
105 | } child_state; | |
106 | ||
7cac2b65 | 107 | /* Functions on the monitor that answer unprivileged requests */ |
826f3a39 | 108 | |
109 | int mm_answer_moduli(int, Buffer *); | |
110 | int mm_answer_sign(int, Buffer *); | |
111 | int mm_answer_pwnamallow(int, Buffer *); | |
112 | int mm_answer_auth2_read_banner(int, Buffer *); | |
113 | int mm_answer_authserv(int, Buffer *); | |
114 | int mm_answer_authpassword(int, Buffer *); | |
115 | int mm_answer_bsdauthquery(int, Buffer *); | |
116 | int mm_answer_bsdauthrespond(int, Buffer *); | |
117 | int mm_answer_skeyquery(int, Buffer *); | |
118 | int mm_answer_skeyrespond(int, Buffer *); | |
119 | int mm_answer_keyallowed(int, Buffer *); | |
120 | int mm_answer_keyverify(int, Buffer *); | |
121 | int mm_answer_pty(int, Buffer *); | |
122 | int mm_answer_pty_cleanup(int, Buffer *); | |
123 | int mm_answer_term(int, Buffer *); | |
124 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
125 | int mm_answer_rsa_challenge(int, Buffer *); | |
126 | int mm_answer_rsa_response(int, Buffer *); | |
127 | int mm_answer_sesskey(int, Buffer *); | |
128 | int mm_answer_sessid(int, Buffer *); | |
129 | ||
130 | #ifdef USE_PAM | |
131 | int mm_answer_pam_start(int, Buffer *); | |
7cac2b65 | 132 | int mm_answer_pam_account(int, Buffer *); |
133 | int mm_answer_pam_init_ctx(int, Buffer *); | |
134 | int mm_answer_pam_query(int, Buffer *); | |
135 | int mm_answer_pam_respond(int, Buffer *); | |
136 | int mm_answer_pam_free_ctx(int, Buffer *); | |
826f3a39 | 137 | #endif |
138 | ||
7cac2b65 | 139 | #ifdef GSSAPI |
140 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
141 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
142 | int mm_answer_gss_userok(int, Buffer *); | |
540d72c3 | 143 | int mm_answer_gss_checkmic(int, Buffer *); |
23987cb8 | 144 | #endif |
145 | ||
b59afbfe | 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 *); | |
b59afbfe | 150 | int mm_answer_gss_sign(int, Buffer *); |
23987cb8 | 151 | int mm_answer_gss_error(int, Buffer *); |
e23e524c | 152 | int mm_answer_gss_indicate_mechs(int, Buffer *); |
153 | int mm_answer_gss_localname(int, Buffer *); | |
b59afbfe | 154 | #endif |
155 | ||
dfddba3d | 156 | #ifdef SSH_AUDIT_EVENTS |
157 | int mm_answer_audit_event(int, Buffer *); | |
158 | int mm_answer_audit_command(int, Buffer *); | |
159 | #endif | |
160 | ||
826f3a39 | 161 | static Authctxt *authctxt; |
162 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
163 | ||
164 | /* local state for key verify */ | |
165 | static u_char *key_blob = NULL; | |
166 | static u_int key_bloblen = 0; | |
167 | static int key_blobtype = MM_NOKEY; | |
d03f4262 | 168 | static char *hostbased_cuser = NULL; |
169 | static char *hostbased_chost = NULL; | |
826f3a39 | 170 | static char *auth_method = "unknown"; |
7cac2b65 | 171 | static u_int session_id2_len = 0; |
44a053a3 | 172 | static u_char *session_id2 = NULL; |
7cac2b65 | 173 | static pid_t monitor_child_pid; |
826f3a39 | 174 | |
175 | struct mon_table { | |
176 | enum monitor_reqtype type; | |
177 | int flags; | |
178 | int (*f)(int, Buffer *); | |
179 | }; | |
180 | ||
181 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
182 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
183 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
184 | ||
185 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
186 | ||
187 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
188 | ||
189 | struct mon_table mon_dispatch_proto20[] = { | |
190 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
191 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
b59afbfe | 192 | {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow}, |
826f3a39 | 193 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, |
194 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, | |
195 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
196 | #ifdef USE_PAM | |
e2447520 | 197 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 198 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
199 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
200 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
201 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
202 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
826f3a39 | 203 | #endif |
dfddba3d | 204 | #ifdef SSH_AUDIT_EVENTS |
205 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
206 | #endif | |
826f3a39 | 207 | #ifdef BSD_AUTH |
208 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
209 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
210 | #endif | |
211 | #ifdef SKEY | |
212 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
213 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
b59afbfe | 214 | #endif |
7cac2b65 | 215 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, |
216 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
b59afbfe | 217 | #ifdef GSSAPI |
218 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
219 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
7cac2b65 | 220 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, |
b59afbfe | 221 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, |
e23e524c | 222 | {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error}, |
9eeaa28e | 223 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
e23e524c | 224 | {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname}, |
540d72c3 | 225 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
826f3a39 | 226 | #endif |
826f3a39 | 227 | {0, 0, NULL} |
228 | }; | |
229 | ||
230 | struct mon_table mon_dispatch_postauth20[] = { | |
b59afbfe | 231 | #ifdef GSSAPI |
232 | {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, | |
233 | {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, | |
234 | {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, | |
23987cb8 | 235 | {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error}, |
e23e524c | 236 | {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs}, |
b59afbfe | 237 | #endif |
826f3a39 | 238 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, |
239 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
240 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
241 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
242 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 243 | #ifdef SSH_AUDIT_EVENTS |
244 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
245 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
246 | #endif | |
826f3a39 | 247 | {0, 0, NULL} |
248 | }; | |
249 | ||
250 | struct mon_table mon_dispatch_proto15[] = { | |
251 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
252 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
253 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
254 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
255 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
256 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
257 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
258 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
826f3a39 | 259 | #ifdef BSD_AUTH |
260 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
261 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
262 | #endif | |
263 | #ifdef SKEY | |
264 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
265 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
266 | #endif | |
b59afbfe | 267 | #ifdef GSSAPI |
268 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
269 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
270 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, | |
271 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
9eeaa28e | 272 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
b59afbfe | 273 | #endif |
826f3a39 | 274 | #ifdef USE_PAM |
e2447520 | 275 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 276 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
277 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
278 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
279 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
280 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
dfddba3d | 281 | #endif |
282 | #ifdef SSH_AUDIT_EVENTS | |
283 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
826f3a39 | 284 | #endif |
285 | {0, 0, NULL} | |
286 | }; | |
287 | ||
288 | struct mon_table mon_dispatch_postauth15[] = { | |
289 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
290 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
291 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 292 | #ifdef SSH_AUDIT_EVENTS |
293 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
294 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, | |
295 | #endif | |
826f3a39 | 296 | {0, 0, NULL} |
297 | }; | |
298 | ||
299 | struct mon_table *mon_dispatch; | |
300 | ||
301 | /* Specifies if a certain message is allowed at the moment */ | |
302 | ||
303 | static void | |
304 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
305 | { | |
306 | while (ent->f != NULL) { | |
307 | if (ent->type == type) { | |
308 | ent->flags &= ~MON_PERMIT; | |
309 | ent->flags |= permit ? MON_PERMIT : 0; | |
310 | return; | |
311 | } | |
312 | ent++; | |
313 | } | |
314 | } | |
315 | ||
316 | static void | |
317 | monitor_permit_authentications(int permit) | |
318 | { | |
319 | struct mon_table *ent = mon_dispatch; | |
320 | ||
321 | while (ent->f != NULL) { | |
322 | if (ent->flags & MON_AUTH) { | |
323 | ent->flags &= ~MON_PERMIT; | |
324 | ent->flags |= permit ? MON_PERMIT : 0; | |
325 | } | |
326 | ent++; | |
327 | } | |
328 | } | |
329 | ||
540d72c3 | 330 | void |
331 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
826f3a39 | 332 | { |
333 | struct mon_table *ent; | |
334 | int authenticated = 0; | |
335 | ||
336 | debug3("preauth child monitor started"); | |
337 | ||
540d72c3 | 338 | authctxt = _authctxt; |
339 | memset(authctxt, 0, sizeof(*authctxt)); | |
340 | ||
826f3a39 | 341 | if (compat20) { |
342 | mon_dispatch = mon_dispatch_proto20; | |
343 | ||
344 | /* Permit requests for moduli and signatures */ | |
345 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
346 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
b59afbfe | 347 | #ifdef GSSAPI |
348 | /* and for the GSSAPI key exchange */ | |
349 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
23987cb8 | 350 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
e23e524c | 351 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1); |
b59afbfe | 352 | #endif |
826f3a39 | 353 | } else { |
354 | mon_dispatch = mon_dispatch_proto15; | |
355 | ||
356 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
357 | } | |
358 | ||
826f3a39 | 359 | /* The first few requests do not require asynchronous access */ |
360 | while (!authenticated) { | |
361 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); | |
362 | if (authenticated) { | |
363 | if (!(ent->flags & MON_AUTHDECIDE)) | |
364 | fatal("%s: unexpected authentication from %d", | |
44a053a3 | 365 | __func__, ent->type); |
826f3a39 | 366 | if (authctxt->pw->pw_uid == 0 && |
367 | !auth_root_allowed(auth_method)) | |
368 | authenticated = 0; | |
369 | #ifdef USE_PAM | |
7cac2b65 | 370 | /* PAM needs to perform account checks after auth */ |
540d72c3 | 371 | if (options.use_pam && authenticated) { |
7cac2b65 | 372 | Buffer m; |
373 | ||
374 | buffer_init(&m); | |
540d72c3 | 375 | mm_request_receive_expect(pmonitor->m_sendfd, |
7cac2b65 | 376 | MONITOR_REQ_PAM_ACCOUNT, &m); |
377 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
378 | buffer_free(&m); | |
379 | } | |
826f3a39 | 380 | #endif |
381 | } | |
382 | ||
383 | if (ent->flags & MON_AUTHDECIDE) { | |
384 | auth_log(authctxt, authenticated, auth_method, | |
385 | compat20 ? " ssh2" : ""); | |
386 | if (!authenticated) | |
387 | authctxt->failures++; | |
388 | } | |
389 | } | |
390 | ||
391 | if (!authctxt->valid) | |
44a053a3 | 392 | fatal("%s: authenticated invalid user", __func__); |
826f3a39 | 393 | |
394 | debug("%s: %s has been authenticated by privileged process", | |
44a053a3 | 395 | __func__, authctxt->user); |
826f3a39 | 396 | |
397 | mm_get_keystate(pmonitor); | |
826f3a39 | 398 | } |
399 | ||
7cac2b65 | 400 | static void |
401 | monitor_set_child_handler(pid_t pid) | |
402 | { | |
403 | monitor_child_pid = pid; | |
404 | } | |
405 | ||
406 | static void | |
7e82606e | 407 | monitor_child_handler(int sig) |
7cac2b65 | 408 | { |
7e82606e | 409 | kill(monitor_child_pid, sig); |
7cac2b65 | 410 | } |
411 | ||
826f3a39 | 412 | void |
413 | monitor_child_postauth(struct monitor *pmonitor) | |
414 | { | |
7cac2b65 | 415 | monitor_set_child_handler(pmonitor->m_pid); |
416 | signal(SIGHUP, &monitor_child_handler); | |
417 | signal(SIGTERM, &monitor_child_handler); | |
418 | ||
826f3a39 | 419 | if (compat20) { |
420 | mon_dispatch = mon_dispatch_postauth20; | |
421 | ||
422 | /* Permit requests for moduli and signatures */ | |
423 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
424 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
425 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
426 | ||
e23e524c | 427 | #ifdef GSSAPI |
428 | /* and for the GSSAPI key exchange */ | |
429 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1); | |
430 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1); | |
431 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1); | |
432 | #endif | |
433 | ||
826f3a39 | 434 | } else { |
435 | mon_dispatch = mon_dispatch_postauth15; | |
436 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
437 | } | |
9eeaa28e | 438 | #ifdef GSSAPI |
23987cb8 | 439 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
9eeaa28e | 440 | #endif |
826f3a39 | 441 | if (!no_pty_flag) { |
442 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
443 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
444 | } | |
445 | ||
446 | for (;;) | |
447 | monitor_read(pmonitor, mon_dispatch, NULL); | |
448 | } | |
449 | ||
450 | void | |
451 | monitor_sync(struct monitor *pmonitor) | |
452 | { | |
44a053a3 | 453 | if (options.compression) { |
454 | /* The member allocation is not visible, so sync it */ | |
455 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
456 | } | |
826f3a39 | 457 | } |
458 | ||
459 | int | |
460 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, | |
461 | struct mon_table **pent) | |
462 | { | |
463 | Buffer m; | |
464 | int ret; | |
465 | u_char type; | |
466 | ||
467 | buffer_init(&m); | |
468 | ||
469 | mm_request_receive(pmonitor->m_sendfd, &m); | |
470 | type = buffer_get_char(&m); | |
471 | ||
44a053a3 | 472 | debug3("%s: checking request %d", __func__, type); |
826f3a39 | 473 | |
474 | while (ent->f != NULL) { | |
475 | if (ent->type == type) | |
476 | break; | |
477 | ent++; | |
478 | } | |
479 | ||
480 | if (ent->f != NULL) { | |
481 | if (!(ent->flags & MON_PERMIT)) | |
44a053a3 | 482 | fatal("%s: unpermitted request %d", __func__, |
826f3a39 | 483 | type); |
484 | ret = (*ent->f)(pmonitor->m_sendfd, &m); | |
485 | buffer_free(&m); | |
486 | ||
487 | /* The child may use this request only once, disable it */ | |
488 | if (ent->flags & MON_ONCE) { | |
44a053a3 | 489 | debug2("%s: %d used once, disabling now", __func__, |
826f3a39 | 490 | type); |
491 | ent->flags &= ~MON_PERMIT; | |
492 | } | |
493 | ||
494 | if (pent != NULL) | |
495 | *pent = ent; | |
496 | ||
497 | return ret; | |
498 | } | |
499 | ||
44a053a3 | 500 | fatal("%s: unsupported request: %d", __func__, type); |
826f3a39 | 501 | |
502 | /* NOTREACHED */ | |
503 | return (-1); | |
504 | } | |
505 | ||
506 | /* allowed key state */ | |
507 | static int | |
508 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
509 | { | |
510 | /* make sure key is allowed */ | |
511 | if (key_blob == NULL || key_bloblen != bloblen || | |
512 | memcmp(key_blob, blob, key_bloblen)) | |
513 | return (0); | |
514 | return (1); | |
515 | } | |
516 | ||
517 | static void | |
518 | monitor_reset_key_state(void) | |
519 | { | |
520 | /* reset state */ | |
521 | if (key_blob != NULL) | |
522 | xfree(key_blob); | |
523 | if (hostbased_cuser != NULL) | |
524 | xfree(hostbased_cuser); | |
525 | if (hostbased_chost != NULL) | |
526 | xfree(hostbased_chost); | |
527 | key_blob = NULL; | |
528 | key_bloblen = 0; | |
529 | key_blobtype = MM_NOKEY; | |
530 | hostbased_cuser = NULL; | |
531 | hostbased_chost = NULL; | |
532 | } | |
533 | ||
534 | int | |
7e82606e | 535 | mm_answer_moduli(int sock, Buffer *m) |
826f3a39 | 536 | { |
537 | DH *dh; | |
538 | int min, want, max; | |
539 | ||
540 | min = buffer_get_int(m); | |
541 | want = buffer_get_int(m); | |
542 | max = buffer_get_int(m); | |
543 | ||
544 | debug3("%s: got parameters: %d %d %d", | |
44a053a3 | 545 | __func__, min, want, max); |
826f3a39 | 546 | /* We need to check here, too, in case the child got corrupted */ |
547 | if (max < min || want < min || max < want) | |
548 | fatal("%s: bad parameters: %d %d %d", | |
44a053a3 | 549 | __func__, min, want, max); |
826f3a39 | 550 | |
551 | buffer_clear(m); | |
552 | ||
553 | dh = choose_dh(min, want, max); | |
554 | if (dh == NULL) { | |
555 | buffer_put_char(m, 0); | |
556 | return (0); | |
557 | } else { | |
558 | /* Send first bignum */ | |
559 | buffer_put_char(m, 1); | |
560 | buffer_put_bignum2(m, dh->p); | |
561 | buffer_put_bignum2(m, dh->g); | |
562 | ||
563 | DH_free(dh); | |
564 | } | |
7e82606e | 565 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
826f3a39 | 566 | return (0); |
567 | } | |
568 | ||
569 | int | |
7e82606e | 570 | mm_answer_sign(int sock, Buffer *m) |
826f3a39 | 571 | { |
572 | Key *key; | |
573 | u_char *p; | |
574 | u_char *signature; | |
575 | u_int siglen, datlen; | |
576 | int keyid; | |
577 | ||
44a053a3 | 578 | debug3("%s", __func__); |
826f3a39 | 579 | |
580 | keyid = buffer_get_int(m); | |
581 | p = buffer_get_string(m, &datlen); | |
582 | ||
583 | if (datlen != 20) | |
d03f4262 | 584 | fatal("%s: data length incorrect: %u", __func__, datlen); |
44a053a3 | 585 | |
586 | /* save session id, it will be passed on the first call */ | |
587 | if (session_id2_len == 0) { | |
588 | session_id2_len = datlen; | |
589 | session_id2 = xmalloc(session_id2_len); | |
590 | memcpy(session_id2, p, session_id2_len); | |
591 | } | |
826f3a39 | 592 | |
593 | if ((key = get_hostkey_by_index(keyid)) == NULL) | |
44a053a3 | 594 | fatal("%s: no hostkey from index %d", __func__, keyid); |
826f3a39 | 595 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
44a053a3 | 596 | fatal("%s: key_sign failed", __func__); |
826f3a39 | 597 | |
d03f4262 | 598 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
826f3a39 | 599 | |
600 | buffer_clear(m); | |
601 | buffer_put_string(m, signature, siglen); | |
602 | ||
603 | xfree(p); | |
604 | xfree(signature); | |
605 | ||
7e82606e | 606 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
826f3a39 | 607 | |
608 | /* Turn on permissions for getpwnam */ | |
609 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
610 | ||
611 | return (0); | |
612 | } | |
613 | ||
614 | /* Retrieves the password entry and also checks if the user is permitted */ | |
615 | ||
616 | int | |
7e82606e | 617 | mm_answer_pwnamallow(int sock, Buffer *m) |
826f3a39 | 618 | { |
7e82606e | 619 | char *username; |
826f3a39 | 620 | struct passwd *pwent; |
621 | int allowed = 0; | |
622 | ||
44a053a3 | 623 | debug3("%s", __func__); |
826f3a39 | 624 | |
7e82606e | 625 | username = buffer_get_string(m, NULL); |
826f3a39 | 626 | |
7e82606e | 627 | pwent = getpwnamallow(username); |
826f3a39 | 628 | |
b59afbfe | 629 | if (authctxt->user) xfree(authctxt->user); |
7e82606e | 630 | authctxt->user = xstrdup(username); |
631 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
632 | xfree(username); | |
826f3a39 | 633 | |
634 | buffer_clear(m); | |
635 | ||
636 | if (pwent == NULL) { | |
637 | buffer_put_char(m, 0); | |
540d72c3 | 638 | authctxt->pw = fakepw(); |
826f3a39 | 639 | goto out; |
640 | } | |
641 | ||
642 | allowed = 1; | |
643 | authctxt->pw = pwent; | |
644 | authctxt->valid = 1; | |
645 | ||
646 | buffer_put_char(m, 1); | |
647 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
648 | buffer_put_cstring(m, pwent->pw_name); | |
649 | buffer_put_cstring(m, "*"); | |
650 | buffer_put_cstring(m, pwent->pw_gecos); | |
651 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
652 | buffer_put_cstring(m, pwent->pw_class); | |
653 | #endif | |
654 | buffer_put_cstring(m, pwent->pw_dir); | |
655 | buffer_put_cstring(m, pwent->pw_shell); | |
656 | ||
657 | out: | |
44a053a3 | 658 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
7e82606e | 659 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
826f3a39 | 660 | |
661 | /* For SSHv1 allow authentication now */ | |
662 | if (!compat20) | |
663 | monitor_permit_authentications(1); | |
664 | else { | |
665 | /* Allow service/style information on the auth context */ | |
666 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
667 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); | |
668 | } | |
669 | ||
670 | #ifdef USE_PAM | |
7cac2b65 | 671 | if (options.use_pam) |
672 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
826f3a39 | 673 | #endif |
dfddba3d | 674 | #ifdef SSH_AUDIT_EVENTS |
675 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); | |
676 | #endif | |
826f3a39 | 677 | |
678 | return (0); | |
679 | } | |
680 | ||
7e82606e | 681 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
826f3a39 | 682 | { |
683 | char *banner; | |
684 | ||
685 | buffer_clear(m); | |
686 | banner = auth2_read_banner(); | |
687 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
7e82606e | 688 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
826f3a39 | 689 | |
690 | if (banner != NULL) | |
d03f4262 | 691 | xfree(banner); |
826f3a39 | 692 | |
693 | return (0); | |
694 | } | |
695 | ||
696 | int | |
7e82606e | 697 | mm_answer_authserv(int sock, Buffer *m) |
826f3a39 | 698 | { |
699 | monitor_permit_authentications(1); | |
700 | ||
701 | authctxt->service = buffer_get_string(m, NULL); | |
702 | authctxt->style = buffer_get_string(m, NULL); | |
703 | debug3("%s: service=%s, style=%s", | |
44a053a3 | 704 | __func__, authctxt->service, authctxt->style); |
826f3a39 | 705 | |
706 | if (strlen(authctxt->style) == 0) { | |
707 | xfree(authctxt->style); | |
708 | authctxt->style = NULL; | |
709 | } | |
710 | ||
711 | return (0); | |
712 | } | |
713 | ||
714 | int | |
7e82606e | 715 | mm_answer_authpassword(int sock, Buffer *m) |
826f3a39 | 716 | { |
717 | static int call_count; | |
718 | char *passwd; | |
d03f4262 | 719 | int authenticated; |
720 | u_int plen; | |
826f3a39 | 721 | |
722 | passwd = buffer_get_string(m, &plen); | |
723 | /* Only authenticate if the context is valid */ | |
44a053a3 | 724 | authenticated = options.password_authentication && |
7cac2b65 | 725 | auth_password(authctxt, passwd); |
826f3a39 | 726 | memset(passwd, 0, strlen(passwd)); |
727 | xfree(passwd); | |
728 | ||
729 | buffer_clear(m); | |
730 | buffer_put_int(m, authenticated); | |
731 | ||
44a053a3 | 732 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 733 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
826f3a39 | 734 | |
735 | call_count++; | |
736 | if (plen == 0 && call_count == 1) | |
737 | auth_method = "none"; | |
738 | else | |
739 | auth_method = "password"; | |
740 | ||
741 | /* Causes monitor loop to terminate if authenticated */ | |
742 | return (authenticated); | |
743 | } | |
744 | ||
745 | #ifdef BSD_AUTH | |
746 | int | |
7e82606e | 747 | mm_answer_bsdauthquery(int sock, Buffer *m) |
826f3a39 | 748 | { |
749 | char *name, *infotxt; | |
750 | u_int numprompts; | |
751 | u_int *echo_on; | |
752 | char **prompts; | |
bfe49944 | 753 | u_int success; |
826f3a39 | 754 | |
bfe49944 | 755 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
756 | &prompts, &echo_on) < 0 ? 0 : 1; | |
826f3a39 | 757 | |
758 | buffer_clear(m); | |
bfe49944 | 759 | buffer_put_int(m, success); |
760 | if (success) | |
826f3a39 | 761 | buffer_put_cstring(m, prompts[0]); |
762 | ||
bfe49944 | 763 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 764 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
826f3a39 | 765 | |
bfe49944 | 766 | if (success) { |
826f3a39 | 767 | xfree(name); |
768 | xfree(infotxt); | |
769 | xfree(prompts); | |
770 | xfree(echo_on); | |
771 | } | |
772 | ||
773 | return (0); | |
774 | } | |
775 | ||
776 | int | |
7e82606e | 777 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
826f3a39 | 778 | { |
779 | char *response; | |
780 | int authok; | |
781 | ||
782 | if (authctxt->as == 0) | |
44a053a3 | 783 | fatal("%s: no bsd auth session", __func__); |
826f3a39 | 784 | |
785 | response = buffer_get_string(m, NULL); | |
44a053a3 | 786 | authok = options.challenge_response_authentication && |
787 | auth_userresponse(authctxt->as, response, 0); | |
826f3a39 | 788 | authctxt->as = NULL; |
44a053a3 | 789 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
826f3a39 | 790 | xfree(response); |
791 | ||
792 | buffer_clear(m); | |
793 | buffer_put_int(m, authok); | |
794 | ||
44a053a3 | 795 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 796 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
826f3a39 | 797 | |
798 | auth_method = "bsdauth"; | |
799 | ||
800 | return (authok != 0); | |
801 | } | |
802 | #endif | |
803 | ||
804 | #ifdef SKEY | |
805 | int | |
7e82606e | 806 | mm_answer_skeyquery(int sock, Buffer *m) |
826f3a39 | 807 | { |
808 | struct skey skey; | |
809 | char challenge[1024]; | |
bfe49944 | 810 | u_int success; |
826f3a39 | 811 | |
12a403af | 812 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
813 | sizeof(challenge)) < 0 ? 0 : 1; | |
826f3a39 | 814 | |
815 | buffer_clear(m); | |
bfe49944 | 816 | buffer_put_int(m, success); |
817 | if (success) | |
826f3a39 | 818 | buffer_put_cstring(m, challenge); |
819 | ||
bfe49944 | 820 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 821 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
826f3a39 | 822 | |
823 | return (0); | |
824 | } | |
825 | ||
826 | int | |
7e82606e | 827 | mm_answer_skeyrespond(int sock, Buffer *m) |
826f3a39 | 828 | { |
829 | char *response; | |
830 | int authok; | |
831 | ||
832 | response = buffer_get_string(m, NULL); | |
833 | ||
44a053a3 | 834 | authok = (options.challenge_response_authentication && |
835 | authctxt->valid && | |
826f3a39 | 836 | skey_haskey(authctxt->pw->pw_name) == 0 && |
837 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
838 | ||
839 | xfree(response); | |
840 | ||
841 | buffer_clear(m); | |
842 | buffer_put_int(m, authok); | |
843 | ||
44a053a3 | 844 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 845 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
826f3a39 | 846 | |
847 | auth_method = "skey"; | |
848 | ||
849 | return (authok != 0); | |
850 | } | |
851 | #endif | |
852 | ||
853 | #ifdef USE_PAM | |
854 | int | |
7e82606e | 855 | mm_answer_pam_start(int sock, Buffer *m) |
826f3a39 | 856 | { |
7cac2b65 | 857 | if (!options.use_pam) |
858 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
859 | ||
12a403af | 860 | start_pam(authctxt); |
826f3a39 | 861 | |
7cac2b65 | 862 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
863 | ||
826f3a39 | 864 | return (0); |
865 | } | |
7cac2b65 | 866 | |
867 | int | |
7e82606e | 868 | mm_answer_pam_account(int sock, Buffer *m) |
7cac2b65 | 869 | { |
870 | u_int ret; | |
540d72c3 | 871 | |
7cac2b65 | 872 | if (!options.use_pam) |
873 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
874 | ||
875 | ret = do_pam_account(); | |
876 | ||
877 | buffer_put_int(m, ret); | |
dfddba3d | 878 | buffer_append(&loginmsg, "\0", 1); |
879 | buffer_put_cstring(m, buffer_ptr(&loginmsg)); | |
880 | buffer_clear(&loginmsg); | |
7cac2b65 | 881 | |
7e82606e | 882 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
7cac2b65 | 883 | |
884 | return (ret); | |
885 | } | |
886 | ||
887 | static void *sshpam_ctxt, *sshpam_authok; | |
888 | extern KbdintDevice sshpam_device; | |
889 | ||
890 | int | |
7e82606e | 891 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
7cac2b65 | 892 | { |
893 | ||
894 | debug3("%s", __func__); | |
895 | authctxt->user = buffer_get_string(m, NULL); | |
896 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
897 | sshpam_authok = NULL; | |
898 | buffer_clear(m); | |
899 | if (sshpam_ctxt != NULL) { | |
900 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
901 | buffer_put_int(m, 1); | |
902 | } else { | |
903 | buffer_put_int(m, 0); | |
904 | } | |
7e82606e | 905 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
7cac2b65 | 906 | return (0); |
907 | } | |
908 | ||
909 | int | |
7e82606e | 910 | mm_answer_pam_query(int sock, Buffer *m) |
7cac2b65 | 911 | { |
912 | char *name, *info, **prompts; | |
913 | u_int num, *echo_on; | |
914 | int i, ret; | |
915 | ||
916 | debug3("%s", __func__); | |
917 | sshpam_authok = NULL; | |
918 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
919 | if (ret == 0 && num == 0) | |
920 | sshpam_authok = sshpam_ctxt; | |
921 | if (num > 1 || name == NULL || info == NULL) | |
922 | ret = -1; | |
923 | buffer_clear(m); | |
924 | buffer_put_int(m, ret); | |
925 | buffer_put_cstring(m, name); | |
926 | xfree(name); | |
927 | buffer_put_cstring(m, info); | |
928 | xfree(info); | |
929 | buffer_put_int(m, num); | |
930 | for (i = 0; i < num; ++i) { | |
931 | buffer_put_cstring(m, prompts[i]); | |
932 | xfree(prompts[i]); | |
933 | buffer_put_int(m, echo_on[i]); | |
934 | } | |
935 | if (prompts != NULL) | |
936 | xfree(prompts); | |
937 | if (echo_on != NULL) | |
938 | xfree(echo_on); | |
7e82606e | 939 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
7cac2b65 | 940 | return (0); |
941 | } | |
942 | ||
943 | int | |
7e82606e | 944 | mm_answer_pam_respond(int sock, Buffer *m) |
7cac2b65 | 945 | { |
946 | char **resp; | |
947 | u_int num; | |
948 | int i, ret; | |
949 | ||
950 | debug3("%s", __func__); | |
951 | sshpam_authok = NULL; | |
952 | num = buffer_get_int(m); | |
953 | if (num > 0) { | |
954 | resp = xmalloc(num * sizeof(char *)); | |
955 | for (i = 0; i < num; ++i) | |
956 | resp[i] = buffer_get_string(m, NULL); | |
957 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
958 | for (i = 0; i < num; ++i) | |
959 | xfree(resp[i]); | |
960 | xfree(resp); | |
961 | } else { | |
962 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
963 | } | |
964 | buffer_clear(m); | |
965 | buffer_put_int(m, ret); | |
7e82606e | 966 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
7cac2b65 | 967 | auth_method = "keyboard-interactive/pam"; |
968 | if (ret == 0) | |
969 | sshpam_authok = sshpam_ctxt; | |
970 | return (0); | |
971 | } | |
972 | ||
973 | int | |
7e82606e | 974 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
7cac2b65 | 975 | { |
976 | ||
977 | debug3("%s", __func__); | |
978 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
979 | buffer_clear(m); | |
7e82606e | 980 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
7cac2b65 | 981 | return (sshpam_authok == sshpam_ctxt); |
982 | } | |
826f3a39 | 983 | #endif |
984 | ||
985 | static void | |
986 | mm_append_debug(Buffer *m) | |
987 | { | |
988 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
44a053a3 | 989 | debug3("%s: Appending debug messages for child", __func__); |
826f3a39 | 990 | buffer_append(m, buffer_ptr(&auth_debug), |
991 | buffer_len(&auth_debug)); | |
992 | buffer_clear(&auth_debug); | |
993 | } | |
994 | } | |
995 | ||
996 | int | |
7e82606e | 997 | mm_answer_keyallowed(int sock, Buffer *m) |
826f3a39 | 998 | { |
999 | Key *key; | |
d03f4262 | 1000 | char *cuser, *chost; |
1001 | u_char *blob; | |
826f3a39 | 1002 | u_int bloblen; |
1003 | enum mm_keytype type = 0; | |
1004 | int allowed = 0; | |
1005 | ||
44a053a3 | 1006 | debug3("%s entering", __func__); |
826f3a39 | 1007 | |
1008 | type = buffer_get_int(m); | |
1009 | cuser = buffer_get_string(m, NULL); | |
1010 | chost = buffer_get_string(m, NULL); | |
1011 | blob = buffer_get_string(m, &bloblen); | |
1012 | ||
1013 | key = key_from_blob(blob, bloblen); | |
1014 | ||
1015 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1016 | (!compat20 && type != MM_RSAHOSTKEY)) | |
44a053a3 | 1017 | fatal("%s: key type and protocol mismatch", __func__); |
826f3a39 | 1018 | |
44a053a3 | 1019 | debug3("%s: key_from_blob: %p", __func__, key); |
826f3a39 | 1020 | |
540d72c3 | 1021 | if (key != NULL && authctxt->valid) { |
826f3a39 | 1022 | switch(type) { |
1023 | case MM_USERKEY: | |
44a053a3 | 1024 | allowed = options.pubkey_authentication && |
1025 | user_key_allowed(authctxt->pw, key); | |
826f3a39 | 1026 | break; |
1027 | case MM_HOSTKEY: | |
44a053a3 | 1028 | allowed = options.hostbased_authentication && |
1029 | hostbased_key_allowed(authctxt->pw, | |
826f3a39 | 1030 | cuser, chost, key); |
1031 | break; | |
1032 | case MM_RSAHOSTKEY: | |
1033 | key->type = KEY_RSA1; /* XXX */ | |
44a053a3 | 1034 | allowed = options.rhosts_rsa_authentication && |
1035 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
826f3a39 | 1036 | cuser, chost, key); |
1037 | break; | |
1038 | default: | |
44a053a3 | 1039 | fatal("%s: unknown key type %d", __func__, type); |
826f3a39 | 1040 | break; |
1041 | } | |
826f3a39 | 1042 | } |
bfe49944 | 1043 | if (key != NULL) |
1044 | key_free(key); | |
826f3a39 | 1045 | |
1046 | /* clear temporarily storage (used by verify) */ | |
1047 | monitor_reset_key_state(); | |
1048 | ||
1049 | if (allowed) { | |
1050 | /* Save temporarily for comparison in verify */ | |
1051 | key_blob = blob; | |
1052 | key_bloblen = bloblen; | |
1053 | key_blobtype = type; | |
1054 | hostbased_cuser = cuser; | |
1055 | hostbased_chost = chost; | |
1056 | } | |
1057 | ||
1058 | debug3("%s: key %p is %s", | |
44a053a3 | 1059 | __func__, key, allowed ? "allowed" : "disallowed"); |
826f3a39 | 1060 | |
1061 | buffer_clear(m); | |
1062 | buffer_put_int(m, allowed); | |
bfe49944 | 1063 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1064 | |
1065 | mm_append_debug(m); | |
1066 | ||
7e82606e | 1067 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
826f3a39 | 1068 | |
1069 | if (type == MM_RSAHOSTKEY) | |
1070 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1071 | ||
1072 | return (0); | |
1073 | } | |
1074 | ||
1075 | static int | |
1076 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1077 | { | |
1078 | Buffer b; | |
d03f4262 | 1079 | char *p; |
826f3a39 | 1080 | u_int len; |
1081 | int fail = 0; | |
826f3a39 | 1082 | |
1083 | buffer_init(&b); | |
1084 | buffer_append(&b, data, datalen); | |
1085 | ||
1086 | if (datafellows & SSH_OLD_SESSIONID) { | |
44a053a3 | 1087 | p = buffer_ptr(&b); |
1088 | len = buffer_len(&b); | |
1089 | if ((session_id2 == NULL) || | |
1090 | (len < session_id2_len) || | |
1091 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1092 | fail++; | |
826f3a39 | 1093 | buffer_consume(&b, session_id2_len); |
1094 | } else { | |
44a053a3 | 1095 | p = buffer_get_string(&b, &len); |
1096 | if ((session_id2 == NULL) || | |
1097 | (len != session_id2_len) || | |
1098 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1099 | fail++; |
44a053a3 | 1100 | xfree(p); |
826f3a39 | 1101 | } |
1102 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1103 | fail++; | |
1104 | p = buffer_get_string(&b, NULL); | |
1105 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1106 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1107 | authctxt->user, p); |
1108 | fail++; | |
1109 | } | |
1110 | xfree(p); | |
1111 | buffer_skip_string(&b); | |
1112 | if (datafellows & SSH_BUG_PKAUTH) { | |
1113 | if (!buffer_get_char(&b)) | |
1114 | fail++; | |
1115 | } else { | |
1116 | p = buffer_get_string(&b, NULL); | |
1117 | if (strcmp("publickey", p) != 0) | |
1118 | fail++; | |
1119 | xfree(p); | |
1120 | if (!buffer_get_char(&b)) | |
1121 | fail++; | |
1122 | buffer_skip_string(&b); | |
1123 | } | |
1124 | buffer_skip_string(&b); | |
1125 | if (buffer_len(&b) != 0) | |
1126 | fail++; | |
1127 | buffer_free(&b); | |
1128 | return (fail == 0); | |
1129 | } | |
1130 | ||
1131 | static int | |
d03f4262 | 1132 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1133 | char *chost) | |
826f3a39 | 1134 | { |
1135 | Buffer b; | |
d03f4262 | 1136 | char *p; |
826f3a39 | 1137 | u_int len; |
1138 | int fail = 0; | |
826f3a39 | 1139 | |
1140 | buffer_init(&b); | |
1141 | buffer_append(&b, data, datalen); | |
1142 | ||
44a053a3 | 1143 | p = buffer_get_string(&b, &len); |
1144 | if ((session_id2 == NULL) || | |
1145 | (len != session_id2_len) || | |
1146 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1147 | fail++; |
44a053a3 | 1148 | xfree(p); |
1149 | ||
826f3a39 | 1150 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1151 | fail++; | |
1152 | p = buffer_get_string(&b, NULL); | |
1153 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1154 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1155 | authctxt->user, p); |
1156 | fail++; | |
1157 | } | |
1158 | xfree(p); | |
1159 | buffer_skip_string(&b); /* service */ | |
1160 | p = buffer_get_string(&b, NULL); | |
1161 | if (strcmp(p, "hostbased") != 0) | |
1162 | fail++; | |
1163 | xfree(p); | |
1164 | buffer_skip_string(&b); /* pkalg */ | |
1165 | buffer_skip_string(&b); /* pkblob */ | |
1166 | ||
1167 | /* verify client host, strip trailing dot if necessary */ | |
1168 | p = buffer_get_string(&b, NULL); | |
1169 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1170 | p[len - 1] = '\0'; | |
1171 | if (strcmp(p, chost) != 0) | |
1172 | fail++; | |
1173 | xfree(p); | |
1174 | ||
1175 | /* verify client user */ | |
1176 | p = buffer_get_string(&b, NULL); | |
1177 | if (strcmp(p, cuser) != 0) | |
1178 | fail++; | |
1179 | xfree(p); | |
1180 | ||
1181 | if (buffer_len(&b) != 0) | |
1182 | fail++; | |
1183 | buffer_free(&b); | |
1184 | return (fail == 0); | |
1185 | } | |
1186 | ||
1187 | int | |
7e82606e | 1188 | mm_answer_keyverify(int sock, Buffer *m) |
826f3a39 | 1189 | { |
1190 | Key *key; | |
1191 | u_char *signature, *data, *blob; | |
1192 | u_int signaturelen, datalen, bloblen; | |
1193 | int verified = 0; | |
1194 | int valid_data = 0; | |
1195 | ||
1196 | blob = buffer_get_string(m, &bloblen); | |
1197 | signature = buffer_get_string(m, &signaturelen); | |
1198 | data = buffer_get_string(m, &datalen); | |
1199 | ||
1200 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
1201 | !monitor_allowed_key(blob, bloblen)) | |
44a053a3 | 1202 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1203 | |
1204 | key = key_from_blob(blob, bloblen); | |
1205 | if (key == NULL) | |
44a053a3 | 1206 | fatal("%s: bad public key blob", __func__); |
826f3a39 | 1207 | |
1208 | switch (key_blobtype) { | |
1209 | case MM_USERKEY: | |
1210 | valid_data = monitor_valid_userblob(data, datalen); | |
1211 | break; | |
1212 | case MM_HOSTKEY: | |
1213 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1214 | hostbased_cuser, hostbased_chost); | |
1215 | break; | |
1216 | default: | |
1217 | valid_data = 0; | |
1218 | break; | |
1219 | } | |
1220 | if (!valid_data) | |
44a053a3 | 1221 | fatal("%s: bad signature data blob", __func__); |
826f3a39 | 1222 | |
1223 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1224 | debug3("%s: key %p signature %s", | |
44a053a3 | 1225 | __func__, key, verified ? "verified" : "unverified"); |
826f3a39 | 1226 | |
1227 | key_free(key); | |
1228 | xfree(blob); | |
1229 | xfree(signature); | |
1230 | xfree(data); | |
1231 | ||
276b07a3 | 1232 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1233 | ||
826f3a39 | 1234 | monitor_reset_key_state(); |
1235 | ||
1236 | buffer_clear(m); | |
1237 | buffer_put_int(m, verified); | |
7e82606e | 1238 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
826f3a39 | 1239 | |
826f3a39 | 1240 | return (verified); |
1241 | } | |
1242 | ||
1243 | static void | |
1244 | mm_record_login(Session *s, struct passwd *pw) | |
1245 | { | |
1246 | socklen_t fromlen; | |
1247 | struct sockaddr_storage from; | |
1248 | ||
1249 | /* | |
1250 | * Get IP address of client. If the connection is not a socket, let | |
1251 | * the address be 0.0.0.0. | |
1252 | */ | |
1253 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 1254 | fromlen = sizeof(from); |
826f3a39 | 1255 | if (packet_connection_is_on_socket()) { |
826f3a39 | 1256 | if (getpeername(packet_get_connection_in(), |
1257 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1258 | debug("getpeername: %.100s", strerror(errno)); | |
540d72c3 | 1259 | cleanup_exit(255); |
826f3a39 | 1260 | } |
1261 | } | |
1262 | /* Record that there was a login on that tty from the remote host. */ | |
1263 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
7cac2b65 | 1264 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d03f4262 | 1265 | (struct sockaddr *)&from, fromlen); |
826f3a39 | 1266 | } |
1267 | ||
1268 | static void | |
1269 | mm_session_close(Session *s) | |
1270 | { | |
7cac2b65 | 1271 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
826f3a39 | 1272 | if (s->ttyfd != -1) { |
44a053a3 | 1273 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
826f3a39 | 1274 | session_pty_cleanup2(s); |
1275 | } | |
1276 | s->used = 0; | |
1277 | } | |
1278 | ||
1279 | int | |
7e82606e | 1280 | mm_answer_pty(int sock, Buffer *m) |
826f3a39 | 1281 | { |
1282 | extern struct monitor *pmonitor; | |
1283 | Session *s; | |
1284 | int res, fd0; | |
1285 | ||
44a053a3 | 1286 | debug3("%s entering", __func__); |
826f3a39 | 1287 | |
1288 | buffer_clear(m); | |
1289 | s = session_new(); | |
1290 | if (s == NULL) | |
1291 | goto error; | |
1292 | s->authctxt = authctxt; | |
1293 | s->pw = authctxt->pw; | |
1294 | s->pid = pmonitor->m_pid; | |
1295 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); | |
1296 | if (res == 0) | |
1297 | goto error; | |
826f3a39 | 1298 | pty_setowner(authctxt->pw, s->tty); |
1299 | ||
1300 | buffer_put_int(m, 1); | |
1301 | buffer_put_cstring(m, s->tty); | |
826f3a39 | 1302 | |
1303 | /* We need to trick ttyslot */ | |
1304 | if (dup2(s->ttyfd, 0) == -1) | |
44a053a3 | 1305 | fatal("%s: dup2", __func__); |
826f3a39 | 1306 | |
1307 | mm_record_login(s, authctxt->pw); | |
1308 | ||
1309 | /* Now we can close the file descriptor again */ | |
1310 | close(0); | |
1311 | ||
7e82606e | 1312 | /* send messages generated by record_login */ |
1313 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1314 | buffer_clear(&loginmsg); | |
1315 | ||
1316 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1317 | ||
1318 | mm_send_fd(sock, s->ptyfd); | |
1319 | mm_send_fd(sock, s->ttyfd); | |
1320 | ||
826f3a39 | 1321 | /* make sure nothing uses fd 0 */ |
1322 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
44a053a3 | 1323 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
826f3a39 | 1324 | if (fd0 != 0) |
44a053a3 | 1325 | error("%s: fd0 %d != 0", __func__, fd0); |
826f3a39 | 1326 | |
1327 | /* slave is not needed */ | |
1328 | close(s->ttyfd); | |
1329 | s->ttyfd = s->ptyfd; | |
1330 | /* no need to dup() because nobody closes ptyfd */ | |
1331 | s->ptymaster = s->ptyfd; | |
1332 | ||
44a053a3 | 1333 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
826f3a39 | 1334 | |
1335 | return (0); | |
1336 | ||
1337 | error: | |
1338 | if (s != NULL) | |
1339 | mm_session_close(s); | |
1340 | buffer_put_int(m, 0); | |
7e82606e | 1341 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
826f3a39 | 1342 | return (0); |
1343 | } | |
1344 | ||
1345 | int | |
7e82606e | 1346 | mm_answer_pty_cleanup(int sock, Buffer *m) |
826f3a39 | 1347 | { |
1348 | Session *s; | |
1349 | char *tty; | |
1350 | ||
44a053a3 | 1351 | debug3("%s entering", __func__); |
826f3a39 | 1352 | |
1353 | tty = buffer_get_string(m, NULL); | |
1354 | if ((s = session_by_tty(tty)) != NULL) | |
1355 | mm_session_close(s); | |
1356 | buffer_clear(m); | |
1357 | xfree(tty); | |
1358 | return (0); | |
1359 | } | |
1360 | ||
1361 | int | |
7e82606e | 1362 | mm_answer_sesskey(int sock, Buffer *m) |
826f3a39 | 1363 | { |
1364 | BIGNUM *p; | |
1365 | int rsafail; | |
1366 | ||
1367 | /* Turn off permissions */ | |
dfddba3d | 1368 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
826f3a39 | 1369 | |
1370 | if ((p = BN_new()) == NULL) | |
44a053a3 | 1371 | fatal("%s: BN_new", __func__); |
826f3a39 | 1372 | |
1373 | buffer_get_bignum2(m, p); | |
1374 | ||
1375 | rsafail = ssh1_session_key(p); | |
1376 | ||
1377 | buffer_clear(m); | |
1378 | buffer_put_int(m, rsafail); | |
1379 | buffer_put_bignum2(m, p); | |
1380 | ||
1381 | BN_clear_free(p); | |
1382 | ||
7e82606e | 1383 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
826f3a39 | 1384 | |
1385 | /* Turn on permissions for sessid passing */ | |
1386 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1387 | ||
1388 | return (0); | |
1389 | } | |
1390 | ||
1391 | int | |
7e82606e | 1392 | mm_answer_sessid(int sock, Buffer *m) |
826f3a39 | 1393 | { |
1394 | int i; | |
1395 | ||
44a053a3 | 1396 | debug3("%s entering", __func__); |
826f3a39 | 1397 | |
1398 | if (buffer_len(m) != 16) | |
44a053a3 | 1399 | fatal("%s: bad ssh1 session id", __func__); |
826f3a39 | 1400 | for (i = 0; i < 16; i++) |
1401 | session_id[i] = buffer_get_char(m); | |
1402 | ||
1403 | /* Turn on permissions for getpwnam */ | |
1404 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1405 | ||
1406 | return (0); | |
1407 | } | |
1408 | ||
1409 | int | |
7e82606e | 1410 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
826f3a39 | 1411 | { |
1412 | BIGNUM *client_n; | |
1413 | Key *key = NULL; | |
1414 | u_char *blob = NULL; | |
1415 | u_int blen = 0; | |
1416 | int allowed = 0; | |
1417 | ||
44a053a3 | 1418 | debug3("%s entering", __func__); |
826f3a39 | 1419 | |
44a053a3 | 1420 | if (options.rsa_authentication && authctxt->valid) { |
826f3a39 | 1421 | if ((client_n = BN_new()) == NULL) |
44a053a3 | 1422 | fatal("%s: BN_new", __func__); |
826f3a39 | 1423 | buffer_get_bignum2(m, client_n); |
1424 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1425 | BN_clear_free(client_n); | |
1426 | } | |
1427 | buffer_clear(m); | |
1428 | buffer_put_int(m, allowed); | |
bfe49944 | 1429 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1430 | |
1431 | /* clear temporarily storage (used by generate challenge) */ | |
1432 | monitor_reset_key_state(); | |
1433 | ||
1434 | if (allowed && key != NULL) { | |
1435 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1436 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 1437 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 1438 | buffer_put_string(m, blob, blen); |
1439 | ||
1440 | /* Save temporarily for comparison in verify */ | |
1441 | key_blob = blob; | |
1442 | key_bloblen = blen; | |
1443 | key_blobtype = MM_RSAUSERKEY; | |
826f3a39 | 1444 | } |
bfe49944 | 1445 | if (key != NULL) |
1446 | key_free(key); | |
826f3a39 | 1447 | |
1448 | mm_append_debug(m); | |
1449 | ||
7e82606e | 1450 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
826f3a39 | 1451 | |
1452 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1453 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1454 | return (0); | |
1455 | } | |
1456 | ||
1457 | int | |
7e82606e | 1458 | mm_answer_rsa_challenge(int sock, Buffer *m) |
826f3a39 | 1459 | { |
1460 | Key *key = NULL; | |
1461 | u_char *blob; | |
1462 | u_int blen; | |
1463 | ||
44a053a3 | 1464 | debug3("%s entering", __func__); |
826f3a39 | 1465 | |
1466 | if (!authctxt->valid) | |
44a053a3 | 1467 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1468 | blob = buffer_get_string(m, &blen); |
1469 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1470 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1471 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1472 | fatal("%s: key type mismatch", __func__); |
826f3a39 | 1473 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1474 | fatal("%s: received bad key", __func__); |
826f3a39 | 1475 | |
1476 | if (ssh1_challenge) | |
1477 | BN_clear_free(ssh1_challenge); | |
1478 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1479 | ||
1480 | buffer_clear(m); | |
1481 | buffer_put_bignum2(m, ssh1_challenge); | |
1482 | ||
44a053a3 | 1483 | debug3("%s sending reply", __func__); |
7e82606e | 1484 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
826f3a39 | 1485 | |
1486 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
bfe49944 | 1487 | |
1488 | xfree(blob); | |
1489 | key_free(key); | |
826f3a39 | 1490 | return (0); |
1491 | } | |
1492 | ||
1493 | int | |
7e82606e | 1494 | mm_answer_rsa_response(int sock, Buffer *m) |
826f3a39 | 1495 | { |
1496 | Key *key = NULL; | |
1497 | u_char *blob, *response; | |
1498 | u_int blen, len; | |
1499 | int success; | |
1500 | ||
44a053a3 | 1501 | debug3("%s entering", __func__); |
826f3a39 | 1502 | |
1503 | if (!authctxt->valid) | |
44a053a3 | 1504 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1505 | if (ssh1_challenge == NULL) |
44a053a3 | 1506 | fatal("%s: no ssh1_challenge", __func__); |
826f3a39 | 1507 | |
1508 | blob = buffer_get_string(m, &blen); | |
1509 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1510 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1511 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1512 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
826f3a39 | 1513 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1514 | fatal("%s: received bad key", __func__); |
826f3a39 | 1515 | response = buffer_get_string(m, &len); |
1516 | if (len != 16) | |
44a053a3 | 1517 | fatal("%s: received bad response to challenge", __func__); |
826f3a39 | 1518 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1519 | ||
bfe49944 | 1520 | xfree(blob); |
826f3a39 | 1521 | key_free(key); |
1522 | xfree(response); | |
1523 | ||
1524 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1525 | ||
1526 | /* reset state */ | |
1527 | BN_clear_free(ssh1_challenge); | |
1528 | ssh1_challenge = NULL; | |
1529 | monitor_reset_key_state(); | |
1530 | ||
1531 | buffer_clear(m); | |
1532 | buffer_put_int(m, success); | |
7e82606e | 1533 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
826f3a39 | 1534 | |
1535 | return (success); | |
1536 | } | |
1537 | ||
1538 | int | |
7e82606e | 1539 | mm_answer_term(int sock, Buffer *req) |
826f3a39 | 1540 | { |
1541 | extern struct monitor *pmonitor; | |
1542 | int res, status; | |
1543 | ||
44a053a3 | 1544 | debug3("%s: tearing down sessions", __func__); |
826f3a39 | 1545 | |
1546 | /* The child is terminating */ | |
1547 | session_destroy_all(&mm_session_close); | |
1548 | ||
1549 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) | |
1550 | if (errno != EINTR) | |
1551 | exit(1); | |
1552 | ||
1553 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1554 | ||
1555 | /* Terminate process */ | |
7e82606e | 1556 | exit(res); |
826f3a39 | 1557 | } |
1558 | ||
dfddba3d | 1559 | #ifdef SSH_AUDIT_EVENTS |
1560 | /* Report that an audit event occurred */ | |
1561 | int | |
1562 | mm_answer_audit_event(int socket, Buffer *m) | |
1563 | { | |
1564 | ssh_audit_event_t event; | |
1565 | ||
1566 | debug3("%s entering", __func__); | |
1567 | ||
1568 | event = buffer_get_int(m); | |
1569 | buffer_free(m); | |
1570 | switch(event) { | |
1571 | case SSH_AUTH_FAIL_PUBKEY: | |
1572 | case SSH_AUTH_FAIL_HOSTBASED: | |
1573 | case SSH_AUTH_FAIL_GSSAPI: | |
1574 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1575 | case SSH_LOGIN_ROOT_DENIED: | |
1576 | case SSH_CONNECTION_CLOSE: | |
1577 | case SSH_INVALID_USER: | |
1578 | audit_event(event); | |
1579 | break; | |
1580 | default: | |
1581 | fatal("Audit event type %d not permitted", event); | |
1582 | } | |
1583 | ||
1584 | return (0); | |
1585 | } | |
1586 | ||
1587 | int | |
1588 | mm_answer_audit_command(int socket, Buffer *m) | |
1589 | { | |
1590 | u_int len; | |
1591 | char *cmd; | |
1592 | ||
1593 | debug3("%s entering", __func__); | |
1594 | cmd = buffer_get_string(m, &len); | |
1595 | /* sanity check command, if so how? */ | |
1596 | audit_run_command(cmd); | |
1597 | xfree(cmd); | |
1598 | buffer_free(m); | |
1599 | return (0); | |
1600 | } | |
1601 | #endif /* SSH_AUDIT_EVENTS */ | |
1602 | ||
826f3a39 | 1603 | void |
1604 | monitor_apply_keystate(struct monitor *pmonitor) | |
1605 | { | |
1606 | if (compat20) { | |
1607 | set_newkeys(MODE_IN); | |
1608 | set_newkeys(MODE_OUT); | |
1609 | } else { | |
826f3a39 | 1610 | packet_set_protocol_flags(child_state.ssh1protoflags); |
44a053a3 | 1611 | packet_set_encryption_key(child_state.ssh1key, |
1612 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1613 | xfree(child_state.ssh1key); | |
826f3a39 | 1614 | } |
1615 | ||
44a053a3 | 1616 | /* for rc4 and other stateful ciphers */ |
826f3a39 | 1617 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1618 | xfree(child_state.keyout); | |
1619 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1620 | xfree(child_state.keyin); | |
1621 | ||
1622 | if (!compat20) { | |
1623 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1624 | xfree(child_state.ivout); | |
1625 | packet_set_iv(MODE_IN, child_state.ivin); | |
1626 | xfree(child_state.ivin); | |
1627 | } | |
1628 | ||
1629 | memcpy(&incoming_stream, &child_state.incoming, | |
1630 | sizeof(incoming_stream)); | |
1631 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1632 | sizeof(outgoing_stream)); | |
1633 | ||
1634 | /* Update with new address */ | |
44a053a3 | 1635 | if (options.compression) |
1636 | mm_init_compression(pmonitor->m_zlib); | |
826f3a39 | 1637 | |
1638 | /* Network I/O buffers */ | |
1639 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1640 | buffer_clear(&input); | |
1641 | buffer_append(&input, child_state.input, child_state.ilen); | |
1642 | memset(child_state.input, 0, child_state.ilen); | |
1643 | xfree(child_state.input); | |
1644 | ||
1645 | buffer_clear(&output); | |
1646 | buffer_append(&output, child_state.output, child_state.olen); | |
1647 | memset(child_state.output, 0, child_state.olen); | |
1648 | xfree(child_state.output); | |
1649 | } | |
1650 | ||
1651 | static Kex * | |
1652 | mm_get_kex(Buffer *m) | |
1653 | { | |
1654 | Kex *kex; | |
1655 | void *blob; | |
1656 | u_int bloblen; | |
1657 | ||
1658 | kex = xmalloc(sizeof(*kex)); | |
1659 | memset(kex, 0, sizeof(*kex)); | |
1660 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
44a053a3 | 1661 | if ((session_id2 == NULL) || |
1662 | (kex->session_id_len != session_id2_len) || | |
1663 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1664 | fatal("mm_get_get: internal error: bad session id"); | |
826f3a39 | 1665 | kex->we_need = buffer_get_int(m); |
bfe49944 | 1666 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
7e82606e | 1667 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
bfe49944 | 1668 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
23987cb8 | 1669 | #ifdef GSSAPI |
7cac2b65 | 1670 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; |
23987cb8 | 1671 | #endif |
826f3a39 | 1672 | kex->server = 1; |
1673 | kex->hostkey_type = buffer_get_int(m); | |
1674 | kex->kex_type = buffer_get_int(m); | |
1675 | blob = buffer_get_string(m, &bloblen); | |
1676 | buffer_init(&kex->my); | |
1677 | buffer_append(&kex->my, blob, bloblen); | |
1678 | xfree(blob); | |
1679 | blob = buffer_get_string(m, &bloblen); | |
1680 | buffer_init(&kex->peer); | |
1681 | buffer_append(&kex->peer, blob, bloblen); | |
1682 | xfree(blob); | |
1683 | kex->done = 1; | |
1684 | kex->flags = buffer_get_int(m); | |
1685 | kex->client_version_string = buffer_get_string(m, NULL); | |
1686 | kex->server_version_string = buffer_get_string(m, NULL); | |
1687 | kex->load_host_key=&get_hostkey_by_type; | |
1688 | kex->host_key_index=&get_hostkey_index; | |
1689 | ||
1690 | return (kex); | |
1691 | } | |
1692 | ||
1693 | /* This function requries careful sanity checking */ | |
1694 | ||
1695 | void | |
1696 | mm_get_keystate(struct monitor *pmonitor) | |
1697 | { | |
1698 | Buffer m; | |
1699 | u_char *blob, *p; | |
1700 | u_int bloblen, plen; | |
7cac2b65 | 1701 | u_int32_t seqnr, packets; |
1702 | u_int64_t blocks; | |
826f3a39 | 1703 | |
44a053a3 | 1704 | debug3("%s: Waiting for new keys", __func__); |
826f3a39 | 1705 | |
1706 | buffer_init(&m); | |
1707 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); | |
1708 | if (!compat20) { | |
1709 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1710 | child_state.ssh1cipher = buffer_get_int(&m); | |
44a053a3 | 1711 | child_state.ssh1key = buffer_get_string(&m, |
1712 | &child_state.ssh1keylen); | |
826f3a39 | 1713 | child_state.ivout = buffer_get_string(&m, |
1714 | &child_state.ivoutlen); | |
1715 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1716 | goto skip; | |
1717 | } else { | |
1718 | /* Get the Kex for rekeying */ | |
1719 | *pmonitor->m_pkex = mm_get_kex(&m); | |
1720 | } | |
1721 | ||
1722 | blob = buffer_get_string(&m, &bloblen); | |
1723 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1724 | xfree(blob); | |
1725 | ||
44a053a3 | 1726 | debug3("%s: Waiting for second key", __func__); |
826f3a39 | 1727 | blob = buffer_get_string(&m, &bloblen); |
1728 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1729 | xfree(blob); | |
1730 | ||
1731 | /* Now get sequence numbers for the packets */ | |
7cac2b65 | 1732 | seqnr = buffer_get_int(&m); |
1733 | blocks = buffer_get_int64(&m); | |
1734 | packets = buffer_get_int(&m); | |
1735 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1736 | seqnr = buffer_get_int(&m); | |
1737 | blocks = buffer_get_int64(&m); | |
1738 | packets = buffer_get_int(&m); | |
1739 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
826f3a39 | 1740 | |
1741 | skip: | |
1742 | /* Get the key context */ | |
1743 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1744 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1745 | ||
44a053a3 | 1746 | debug3("%s: Getting compression state", __func__); |
826f3a39 | 1747 | /* Get compression state */ |
1748 | p = buffer_get_string(&m, &plen); | |
1749 | if (plen != sizeof(child_state.outgoing)) | |
44a053a3 | 1750 | fatal("%s: bad request size", __func__); |
826f3a39 | 1751 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1752 | xfree(p); | |
1753 | ||
1754 | p = buffer_get_string(&m, &plen); | |
1755 | if (plen != sizeof(child_state.incoming)) | |
44a053a3 | 1756 | fatal("%s: bad request size", __func__); |
826f3a39 | 1757 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1758 | xfree(p); | |
1759 | ||
1760 | /* Network I/O buffers */ | |
44a053a3 | 1761 | debug3("%s: Getting Network I/O buffers", __func__); |
826f3a39 | 1762 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1763 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1764 | ||
1765 | buffer_free(&m); | |
1766 | } | |
1767 | ||
1768 | ||
1769 | /* Allocation functions for zlib */ | |
1770 | void * | |
1771 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1772 | { | |
bfe49944 | 1773 | size_t len = (size_t) size * ncount; |
826f3a39 | 1774 | void *address; |
1775 | ||
d03f4262 | 1776 | if (len == 0 || ncount > SIZE_T_MAX / size) |
276b07a3 | 1777 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1778 | ||
1779 | address = mm_malloc(mm, len); | |
826f3a39 | 1780 | |
1781 | return (address); | |
1782 | } | |
1783 | ||
1784 | void | |
1785 | mm_zfree(struct mm_master *mm, void *address) | |
1786 | { | |
1787 | mm_free(mm, address); | |
1788 | } | |
1789 | ||
1790 | void | |
1791 | mm_init_compression(struct mm_master *mm) | |
1792 | { | |
1793 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1794 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1795 | outgoing_stream.opaque = mm; | |
1796 | ||
1797 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1798 | incoming_stream.zfree = (free_func)mm_zfree; | |
1799 | incoming_stream.opaque = mm; | |
1800 | } | |
1801 | ||
1802 | /* XXX */ | |
1803 | ||
1804 | #define FD_CLOSEONEXEC(x) do { \ | |
1805 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1806 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1807 | } while (0) | |
1808 | ||
1809 | static void | |
1810 | monitor_socketpair(int *pair) | |
1811 | { | |
1812 | #ifdef HAVE_SOCKETPAIR | |
1813 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) | |
44a053a3 | 1814 | fatal("%s: socketpair", __func__); |
826f3a39 | 1815 | #else |
1816 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
44a053a3 | 1817 | __func__); |
826f3a39 | 1818 | #endif |
1819 | FD_CLOSEONEXEC(pair[0]); | |
1820 | FD_CLOSEONEXEC(pair[1]); | |
1821 | } | |
1822 | ||
1823 | #define MM_MEMSIZE 65536 | |
1824 | ||
1825 | struct monitor * | |
1826 | monitor_init(void) | |
1827 | { | |
1828 | struct monitor *mon; | |
1829 | int pair[2]; | |
1830 | ||
1831 | mon = xmalloc(sizeof(*mon)); | |
1832 | ||
540d72c3 | 1833 | mon->m_pid = 0; |
826f3a39 | 1834 | monitor_socketpair(pair); |
1835 | ||
1836 | mon->m_recvfd = pair[0]; | |
1837 | mon->m_sendfd = pair[1]; | |
1838 | ||
1839 | /* Used to share zlib space across processes */ | |
44a053a3 | 1840 | if (options.compression) { |
1841 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1842 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
826f3a39 | 1843 | |
44a053a3 | 1844 | /* Compression needs to share state across borders */ |
1845 | mm_init_compression(mon->m_zlib); | |
1846 | } | |
826f3a39 | 1847 | |
1848 | return mon; | |
1849 | } | |
1850 | ||
1851 | void | |
1852 | monitor_reinit(struct monitor *mon) | |
1853 | { | |
1854 | int pair[2]; | |
1855 | ||
1856 | monitor_socketpair(pair); | |
1857 | ||
1858 | mon->m_recvfd = pair[0]; | |
1859 | mon->m_sendfd = pair[1]; | |
1860 | } | |
b59afbfe | 1861 | |
7cac2b65 | 1862 | #ifdef GSSAPI |
1863 | int | |
7e82606e | 1864 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7cac2b65 | 1865 | { |
7e82606e | 1866 | gss_OID_desc goid; |
7cac2b65 | 1867 | OM_uint32 major; |
1868 | u_int len; | |
b59afbfe | 1869 | |
7e82606e | 1870 | goid.elements = buffer_get_string(m, &len); |
1871 | goid.length = len; | |
b59afbfe | 1872 | |
7e82606e | 1873 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
e23e524c | 1874 | |
7e82606e | 1875 | xfree(goid.elements); |
7cac2b65 | 1876 | |
1877 | buffer_clear(m); | |
1878 | buffer_put_int(m, major); | |
1879 | ||
7e82606e | 1880 | mm_request_send(sock,MONITOR_ANS_GSSSETUP, m); |
7cac2b65 | 1881 | |
1882 | /* Now we have a context, enable the step */ | |
1883 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1884 | ||
1885 | return (0); | |
b59afbfe | 1886 | } |
1887 | ||
1888 | int | |
7e82606e | 1889 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7cac2b65 | 1890 | { |
1891 | gss_buffer_desc in; | |
1892 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1893 | OM_uint32 major,minor; | |
1894 | OM_uint32 flags = 0; /* GSI needs this */ | |
1895 | u_int len; | |
b59afbfe | 1896 | |
7cac2b65 | 1897 | in.value = buffer_get_string(m, &len); |
1898 | in.length = len; | |
1899 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); | |
1900 | xfree(in.value); | |
b59afbfe | 1901 | |
7cac2b65 | 1902 | buffer_clear(m); |
1903 | buffer_put_int(m, major); | |
1904 | buffer_put_string(m, out.value, out.length); | |
1905 | buffer_put_int(m, flags); | |
7e82606e | 1906 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
b59afbfe | 1907 | |
7cac2b65 | 1908 | gss_release_buffer(&minor, &out); |
b59afbfe | 1909 | |
e23e524c | 1910 | if (major==GSS_S_COMPLETE) { |
7cac2b65 | 1911 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1912 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1913 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); | |
540d72c3 | 1914 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
e23e524c | 1915 | } |
7cac2b65 | 1916 | return (0); |
b59afbfe | 1917 | } |
e23e524c | 1918 | |
540d72c3 | 1919 | int |
7e82606e | 1920 | mm_answer_gss_checkmic(int sock, Buffer *m) |
540d72c3 | 1921 | { |
1922 | gss_buffer_desc gssbuf, mic; | |
1923 | OM_uint32 ret; | |
1924 | u_int len; | |
1925 | ||
1926 | gssbuf.value = buffer_get_string(m, &len); | |
1927 | gssbuf.length = len; | |
1928 | mic.value = buffer_get_string(m, &len); | |
1929 | mic.length = len; | |
1930 | ||
1931 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); | |
1932 | ||
1933 | xfree(gssbuf.value); | |
1934 | xfree(mic.value); | |
1935 | ||
1936 | buffer_clear(m); | |
1937 | buffer_put_int(m, ret); | |
1938 | ||
7e82606e | 1939 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
540d72c3 | 1940 | |
1941 | if (!GSS_ERROR(ret)) | |
1942 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1943 | ||
1944 | return (0); | |
1945 | } | |
1946 | ||
b59afbfe | 1947 | int |
7e82606e | 1948 | mm_answer_gss_userok(int sock, Buffer *m) |
7cac2b65 | 1949 | { |
b59afbfe | 1950 | int authenticated; |
1951 | ||
7cac2b65 | 1952 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); |
b59afbfe | 1953 | |
7cac2b65 | 1954 | buffer_clear(m); |
1955 | buffer_put_int(m, authenticated); | |
b59afbfe | 1956 | |
7cac2b65 | 1957 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 1958 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
b59afbfe | 1959 | |
540d72c3 | 1960 | auth_method="gssapi-with-mic"; |
7cac2b65 | 1961 | |
1962 | /* Monitor loop will terminate if authenticated */ | |
1963 | return (authenticated); | |
b59afbfe | 1964 | } |
23987cb8 | 1965 | |
b59afbfe | 1966 | int |
1967 | mm_answer_gss_sign(int socket, Buffer *m) { | |
1968 | gss_buffer_desc data,hash; | |
1969 | OM_uint32 major,minor; | |
77e22b94 | 1970 | u_int len; |
b59afbfe | 1971 | |
77e22b94 | 1972 | data.value = buffer_get_string(m, &len); |
1973 | data.length = len; | |
b59afbfe | 1974 | if (data.length != 20) |
77e22b94 | 1975 | fatal("%s: data length incorrect: %d", __func__, |
1976 | (int)data.length); | |
b59afbfe | 1977 | |
1978 | /* Save the session ID - only first time round */ | |
1979 | if (session_id2_len == 0) { | |
1980 | session_id2_len=data.length; | |
1981 | session_id2 = xmalloc(session_id2_len); | |
1982 | memcpy(session_id2, data.value, session_id2_len); | |
1983 | } | |
b59afbfe | 1984 | major=ssh_gssapi_sign(gsscontext, &data, &hash); |
1985 | ||
1986 | xfree(data.value); | |
1987 | ||
1988 | buffer_clear(m); | |
1989 | buffer_put_int(m, major); | |
1990 | buffer_put_string(m, hash.value, hash.length); | |
1991 | ||
1992 | mm_request_send(socket,MONITOR_ANS_GSSSIGN,m); | |
1993 | ||
1994 | gss_release_buffer(&minor,&hash); | |
1995 | ||
1996 | /* Turn on permissions for getpwnam */ | |
1997 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1998 | ||
1999 | return(0); | |
2000 | } | |
2001 | ||
e23e524c | 2002 | int |
2003 | mm_answer_gss_error(int socket, Buffer *m) { | |
2004 | OM_uint32 major,minor; | |
2005 | char *msg; | |
2006 | ||
2007 | msg=ssh_gssapi_last_error(gsscontext,&major,&minor); | |
2008 | buffer_clear(m); | |
2009 | buffer_put_int(m,major); | |
2010 | buffer_put_int(m,minor); | |
2011 | buffer_put_cstring(m,msg); | |
2012 | ||
2013 | mm_request_send(socket,MONITOR_ANS_GSSERR,m); | |
2014 | ||
2015 | xfree(msg); | |
2016 | ||
2017 | return(0); | |
2018 | } | |
2019 | ||
9eeaa28e | 2020 | int |
2021 | mm_answer_gss_indicate_mechs(int socket, Buffer *m) { | |
2022 | OM_uint32 major,minor; | |
2023 | gss_OID_set mech_set; | |
2024 | int i; | |
2025 | ||
2026 | major=gss_indicate_mechs(&minor, &mech_set); | |
2027 | ||
2028 | buffer_clear(m); | |
2029 | buffer_put_int(m, major); | |
2030 | buffer_put_int(m, mech_set->count); | |
2031 | for (i=0; i < mech_set->count; i++) { | |
2032 | buffer_put_string(m, mech_set->elements[i].elements, | |
2033 | mech_set->elements[i].length); | |
2034 | } | |
2035 | ||
e23e524c | 2036 | #if !defined(MECHGLUE) /* mechglue memory management bug ??? */ |
2037 | gss_release_oid_set(&minor,&mech_set); | |
2038 | #endif | |
2039 | ||
9eeaa28e | 2040 | mm_request_send(socket,MONITOR_ANS_GSSMECHS,m); |
2041 | ||
2042 | return(0); | |
2043 | } | |
2044 | ||
2045 | int | |
e23e524c | 2046 | mm_answer_gss_localname(int socket, Buffer *m) { |
2047 | char *name; | |
9eeaa28e | 2048 | |
e23e524c | 2049 | ssh_gssapi_localname(&name); |
9eeaa28e | 2050 | |
e23e524c | 2051 | buffer_clear(m); |
2052 | if (name) { | |
2053 | buffer_put_cstring(m, name); | |
2054 | debug3("%s: sending result %s", __func__, name); | |
2055 | xfree(name); | |
2056 | } else { | |
2057 | buffer_put_cstring(m, ""); | |
2058 | debug3("%s: sending result \"\"", __func__); | |
2059 | } | |
2060 | ||
2061 | mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m); | |
9eeaa28e | 2062 | |
23987cb8 | 2063 | return(0); |
9eeaa28e | 2064 | } |
b59afbfe | 2065 | #endif /* GSSAPI */ |