]>
Commit | Line | Data |
---|---|---|
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" | |
8b32eddc | 28 | RCSID("$OpenBSD: monitor.c,v 1.63 2005/03/10 22:01:05 deraadt 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 *); |
b59afbfe | 144 | int mm_answer_gss_sign(int, Buffer *); |
23987cb8 | 145 | int mm_answer_gss_error(int, Buffer *); |
e23e524c | 146 | int mm_answer_gss_indicate_mechs(int, Buffer *); |
147 | int mm_answer_gss_localname(int, Buffer *); | |
b59afbfe | 148 | #endif |
149 | ||
dfddba3d | 150 | #ifdef SSH_AUDIT_EVENTS |
151 | int mm_answer_audit_event(int, Buffer *); | |
152 | int mm_answer_audit_command(int, Buffer *); | |
153 | #endif | |
154 | ||
826f3a39 | 155 | static Authctxt *authctxt; |
156 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
157 | ||
158 | /* local state for key verify */ | |
159 | static u_char *key_blob = NULL; | |
160 | static u_int key_bloblen = 0; | |
161 | static int key_blobtype = MM_NOKEY; | |
d03f4262 | 162 | static char *hostbased_cuser = NULL; |
163 | static char *hostbased_chost = NULL; | |
826f3a39 | 164 | static char *auth_method = "unknown"; |
7cac2b65 | 165 | static u_int session_id2_len = 0; |
44a053a3 | 166 | static u_char *session_id2 = NULL; |
7cac2b65 | 167 | static pid_t monitor_child_pid; |
826f3a39 | 168 | |
169 | struct mon_table { | |
170 | enum monitor_reqtype type; | |
171 | int flags; | |
172 | int (*f)(int, Buffer *); | |
173 | }; | |
174 | ||
175 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
176 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
177 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
178 | ||
179 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
180 | ||
181 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
182 | ||
183 | struct mon_table mon_dispatch_proto20[] = { | |
184 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
185 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
b59afbfe | 186 | {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow}, |
826f3a39 | 187 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, |
188 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, | |
189 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
190 | #ifdef USE_PAM | |
e2447520 | 191 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 192 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
193 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
194 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
195 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
196 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
826f3a39 | 197 | #endif |
dfddba3d | 198 | #ifdef SSH_AUDIT_EVENTS |
199 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
200 | #endif | |
826f3a39 | 201 | #ifdef BSD_AUTH |
202 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
203 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
204 | #endif | |
205 | #ifdef SKEY | |
206 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
207 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
b59afbfe | 208 | #endif |
7cac2b65 | 209 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, |
210 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
b59afbfe | 211 | #ifdef GSSAPI |
212 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
213 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
7cac2b65 | 214 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, |
fe4ad273 | 215 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
b59afbfe | 216 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, |
e23e524c | 217 | {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error}, |
9eeaa28e | 218 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
e23e524c | 219 | {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname}, |
826f3a39 | 220 | #endif |
826f3a39 | 221 | {0, 0, NULL} |
222 | }; | |
223 | ||
224 | struct mon_table mon_dispatch_postauth20[] = { | |
b59afbfe | 225 | #ifdef GSSAPI |
226 | {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, | |
227 | {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, | |
228 | {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, | |
23987cb8 | 229 | {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error}, |
e23e524c | 230 | {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs}, |
b59afbfe | 231 | #endif |
826f3a39 | 232 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, |
233 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
234 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
235 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
236 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 237 | #ifdef SSH_AUDIT_EVENTS |
238 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
239 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
240 | #endif | |
826f3a39 | 241 | {0, 0, NULL} |
242 | }; | |
243 | ||
244 | struct mon_table mon_dispatch_proto15[] = { | |
245 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
246 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
247 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
248 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
249 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH, mm_answer_rsa_keyallowed}, | |
250 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, | |
251 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, | |
252 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
826f3a39 | 253 | #ifdef BSD_AUTH |
254 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
255 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH,mm_answer_bsdauthrespond}, | |
256 | #endif | |
257 | #ifdef SKEY | |
258 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
259 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
260 | #endif | |
b59afbfe | 261 | #ifdef GSSAPI |
262 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
263 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
264 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, | |
265 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
9eeaa28e | 266 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
b59afbfe | 267 | #endif |
826f3a39 | 268 | #ifdef USE_PAM |
e2447520 | 269 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 270 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
271 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
272 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
273 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
274 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
dfddba3d | 275 | #endif |
276 | #ifdef SSH_AUDIT_EVENTS | |
277 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
826f3a39 | 278 | #endif |
279 | {0, 0, NULL} | |
280 | }; | |
281 | ||
282 | struct mon_table mon_dispatch_postauth15[] = { | |
283 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
284 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
285 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 286 | #ifdef SSH_AUDIT_EVENTS |
287 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
288 | {MONITOR_REQ_AUDIT_COMMAND, MON_ONCE, mm_answer_audit_command}, | |
289 | #endif | |
826f3a39 | 290 | {0, 0, NULL} |
291 | }; | |
292 | ||
293 | struct mon_table *mon_dispatch; | |
294 | ||
295 | /* Specifies if a certain message is allowed at the moment */ | |
296 | ||
297 | static void | |
298 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
299 | { | |
300 | while (ent->f != NULL) { | |
301 | if (ent->type == type) { | |
302 | ent->flags &= ~MON_PERMIT; | |
303 | ent->flags |= permit ? MON_PERMIT : 0; | |
304 | return; | |
305 | } | |
306 | ent++; | |
307 | } | |
308 | } | |
309 | ||
310 | static void | |
311 | monitor_permit_authentications(int permit) | |
312 | { | |
313 | struct mon_table *ent = mon_dispatch; | |
314 | ||
315 | while (ent->f != NULL) { | |
316 | if (ent->flags & MON_AUTH) { | |
317 | ent->flags &= ~MON_PERMIT; | |
318 | ent->flags |= permit ? MON_PERMIT : 0; | |
319 | } | |
320 | ent++; | |
321 | } | |
322 | } | |
323 | ||
540d72c3 | 324 | void |
325 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
826f3a39 | 326 | { |
327 | struct mon_table *ent; | |
328 | int authenticated = 0; | |
329 | ||
330 | debug3("preauth child monitor started"); | |
331 | ||
540d72c3 | 332 | authctxt = _authctxt; |
333 | memset(authctxt, 0, sizeof(*authctxt)); | |
334 | ||
8b32eddc | 335 | authctxt->loginmsg = &loginmsg; |
336 | ||
826f3a39 | 337 | if (compat20) { |
338 | mon_dispatch = mon_dispatch_proto20; | |
339 | ||
340 | /* Permit requests for moduli and signatures */ | |
341 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
342 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
b59afbfe | 343 | #ifdef GSSAPI |
344 | /* and for the GSSAPI key exchange */ | |
345 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
23987cb8 | 346 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
e23e524c | 347 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1); |
b59afbfe | 348 | #endif |
826f3a39 | 349 | } else { |
350 | mon_dispatch = mon_dispatch_proto15; | |
351 | ||
352 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
353 | } | |
354 | ||
826f3a39 | 355 | /* The first few requests do not require asynchronous access */ |
356 | while (!authenticated) { | |
357 | authenticated = monitor_read(pmonitor, mon_dispatch, &ent); | |
358 | if (authenticated) { | |
359 | if (!(ent->flags & MON_AUTHDECIDE)) | |
360 | fatal("%s: unexpected authentication from %d", | |
44a053a3 | 361 | __func__, ent->type); |
826f3a39 | 362 | if (authctxt->pw->pw_uid == 0 && |
363 | !auth_root_allowed(auth_method)) | |
364 | authenticated = 0; | |
365 | #ifdef USE_PAM | |
7cac2b65 | 366 | /* PAM needs to perform account checks after auth */ |
540d72c3 | 367 | if (options.use_pam && authenticated) { |
7cac2b65 | 368 | Buffer m; |
369 | ||
370 | buffer_init(&m); | |
540d72c3 | 371 | mm_request_receive_expect(pmonitor->m_sendfd, |
7cac2b65 | 372 | MONITOR_REQ_PAM_ACCOUNT, &m); |
373 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
374 | buffer_free(&m); | |
375 | } | |
826f3a39 | 376 | #endif |
377 | } | |
378 | ||
379 | if (ent->flags & MON_AUTHDECIDE) { | |
380 | auth_log(authctxt, authenticated, auth_method, | |
381 | compat20 ? " ssh2" : ""); | |
382 | if (!authenticated) | |
383 | authctxt->failures++; | |
384 | } | |
385 | } | |
386 | ||
387 | if (!authctxt->valid) | |
44a053a3 | 388 | fatal("%s: authenticated invalid user", __func__); |
826f3a39 | 389 | |
390 | debug("%s: %s has been authenticated by privileged process", | |
44a053a3 | 391 | __func__, authctxt->user); |
826f3a39 | 392 | |
393 | mm_get_keystate(pmonitor); | |
826f3a39 | 394 | } |
395 | ||
7cac2b65 | 396 | static void |
397 | monitor_set_child_handler(pid_t pid) | |
398 | { | |
399 | monitor_child_pid = pid; | |
400 | } | |
401 | ||
402 | static void | |
7e82606e | 403 | monitor_child_handler(int sig) |
7cac2b65 | 404 | { |
7e82606e | 405 | kill(monitor_child_pid, sig); |
7cac2b65 | 406 | } |
407 | ||
826f3a39 | 408 | void |
409 | monitor_child_postauth(struct monitor *pmonitor) | |
410 | { | |
7cac2b65 | 411 | monitor_set_child_handler(pmonitor->m_pid); |
412 | signal(SIGHUP, &monitor_child_handler); | |
413 | signal(SIGTERM, &monitor_child_handler); | |
414 | ||
826f3a39 | 415 | if (compat20) { |
416 | mon_dispatch = mon_dispatch_postauth20; | |
417 | ||
418 | /* Permit requests for moduli and signatures */ | |
419 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
420 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
421 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
422 | ||
e23e524c | 423 | #ifdef GSSAPI |
424 | /* and for the GSSAPI key exchange */ | |
425 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1); | |
426 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1); | |
427 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1); | |
428 | #endif | |
429 | ||
826f3a39 | 430 | } else { |
431 | mon_dispatch = mon_dispatch_postauth15; | |
432 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
433 | } | |
9eeaa28e | 434 | #ifdef GSSAPI |
23987cb8 | 435 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
9eeaa28e | 436 | #endif |
826f3a39 | 437 | if (!no_pty_flag) { |
438 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
439 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
440 | } | |
441 | ||
442 | for (;;) | |
443 | monitor_read(pmonitor, mon_dispatch, NULL); | |
444 | } | |
445 | ||
446 | void | |
447 | monitor_sync(struct monitor *pmonitor) | |
448 | { | |
44a053a3 | 449 | if (options.compression) { |
450 | /* The member allocation is not visible, so sync it */ | |
451 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
452 | } | |
826f3a39 | 453 | } |
454 | ||
455 | int | |
456 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, | |
457 | struct mon_table **pent) | |
458 | { | |
459 | Buffer m; | |
460 | int ret; | |
461 | u_char type; | |
462 | ||
463 | buffer_init(&m); | |
464 | ||
465 | mm_request_receive(pmonitor->m_sendfd, &m); | |
466 | type = buffer_get_char(&m); | |
467 | ||
44a053a3 | 468 | debug3("%s: checking request %d", __func__, type); |
826f3a39 | 469 | |
470 | while (ent->f != NULL) { | |
471 | if (ent->type == type) | |
472 | break; | |
473 | ent++; | |
474 | } | |
475 | ||
476 | if (ent->f != NULL) { | |
477 | if (!(ent->flags & MON_PERMIT)) | |
44a053a3 | 478 | fatal("%s: unpermitted request %d", __func__, |
826f3a39 | 479 | type); |
480 | ret = (*ent->f)(pmonitor->m_sendfd, &m); | |
481 | buffer_free(&m); | |
482 | ||
483 | /* The child may use this request only once, disable it */ | |
484 | if (ent->flags & MON_ONCE) { | |
44a053a3 | 485 | debug2("%s: %d used once, disabling now", __func__, |
826f3a39 | 486 | type); |
487 | ent->flags &= ~MON_PERMIT; | |
488 | } | |
489 | ||
490 | if (pent != NULL) | |
491 | *pent = ent; | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
44a053a3 | 496 | fatal("%s: unsupported request: %d", __func__, type); |
826f3a39 | 497 | |
498 | /* NOTREACHED */ | |
499 | return (-1); | |
500 | } | |
501 | ||
502 | /* allowed key state */ | |
503 | static int | |
504 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
505 | { | |
506 | /* make sure key is allowed */ | |
507 | if (key_blob == NULL || key_bloblen != bloblen || | |
508 | memcmp(key_blob, blob, key_bloblen)) | |
509 | return (0); | |
510 | return (1); | |
511 | } | |
512 | ||
513 | static void | |
514 | monitor_reset_key_state(void) | |
515 | { | |
516 | /* reset state */ | |
517 | if (key_blob != NULL) | |
518 | xfree(key_blob); | |
519 | if (hostbased_cuser != NULL) | |
520 | xfree(hostbased_cuser); | |
521 | if (hostbased_chost != NULL) | |
522 | xfree(hostbased_chost); | |
523 | key_blob = NULL; | |
524 | key_bloblen = 0; | |
525 | key_blobtype = MM_NOKEY; | |
526 | hostbased_cuser = NULL; | |
527 | hostbased_chost = NULL; | |
528 | } | |
529 | ||
530 | int | |
7e82606e | 531 | mm_answer_moduli(int sock, Buffer *m) |
826f3a39 | 532 | { |
533 | DH *dh; | |
534 | int min, want, max; | |
535 | ||
536 | min = buffer_get_int(m); | |
537 | want = buffer_get_int(m); | |
538 | max = buffer_get_int(m); | |
539 | ||
540 | debug3("%s: got parameters: %d %d %d", | |
44a053a3 | 541 | __func__, min, want, max); |
826f3a39 | 542 | /* We need to check here, too, in case the child got corrupted */ |
543 | if (max < min || want < min || max < want) | |
544 | fatal("%s: bad parameters: %d %d %d", | |
44a053a3 | 545 | __func__, min, want, max); |
826f3a39 | 546 | |
547 | buffer_clear(m); | |
548 | ||
549 | dh = choose_dh(min, want, max); | |
550 | if (dh == NULL) { | |
551 | buffer_put_char(m, 0); | |
552 | return (0); | |
553 | } else { | |
554 | /* Send first bignum */ | |
555 | buffer_put_char(m, 1); | |
556 | buffer_put_bignum2(m, dh->p); | |
557 | buffer_put_bignum2(m, dh->g); | |
558 | ||
559 | DH_free(dh); | |
560 | } | |
7e82606e | 561 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
826f3a39 | 562 | return (0); |
563 | } | |
564 | ||
565 | int | |
7e82606e | 566 | mm_answer_sign(int sock, Buffer *m) |
826f3a39 | 567 | { |
568 | Key *key; | |
569 | u_char *p; | |
570 | u_char *signature; | |
571 | u_int siglen, datlen; | |
572 | int keyid; | |
573 | ||
44a053a3 | 574 | debug3("%s", __func__); |
826f3a39 | 575 | |
576 | keyid = buffer_get_int(m); | |
577 | p = buffer_get_string(m, &datlen); | |
578 | ||
579 | if (datlen != 20) | |
d03f4262 | 580 | fatal("%s: data length incorrect: %u", __func__, datlen); |
44a053a3 | 581 | |
582 | /* save session id, it will be passed on the first call */ | |
583 | if (session_id2_len == 0) { | |
584 | session_id2_len = datlen; | |
585 | session_id2 = xmalloc(session_id2_len); | |
586 | memcpy(session_id2, p, session_id2_len); | |
587 | } | |
826f3a39 | 588 | |
589 | if ((key = get_hostkey_by_index(keyid)) == NULL) | |
44a053a3 | 590 | fatal("%s: no hostkey from index %d", __func__, keyid); |
826f3a39 | 591 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
44a053a3 | 592 | fatal("%s: key_sign failed", __func__); |
826f3a39 | 593 | |
d03f4262 | 594 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
826f3a39 | 595 | |
596 | buffer_clear(m); | |
597 | buffer_put_string(m, signature, siglen); | |
598 | ||
599 | xfree(p); | |
600 | xfree(signature); | |
601 | ||
7e82606e | 602 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
826f3a39 | 603 | |
604 | /* Turn on permissions for getpwnam */ | |
605 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
606 | ||
607 | return (0); | |
608 | } | |
609 | ||
610 | /* Retrieves the password entry and also checks if the user is permitted */ | |
611 | ||
612 | int | |
7e82606e | 613 | mm_answer_pwnamallow(int sock, Buffer *m) |
826f3a39 | 614 | { |
7e82606e | 615 | char *username; |
826f3a39 | 616 | struct passwd *pwent; |
617 | int allowed = 0; | |
618 | ||
44a053a3 | 619 | debug3("%s", __func__); |
826f3a39 | 620 | |
7e82606e | 621 | username = buffer_get_string(m, NULL); |
826f3a39 | 622 | |
7e82606e | 623 | pwent = getpwnamallow(username); |
826f3a39 | 624 | |
b59afbfe | 625 | if (authctxt->user) xfree(authctxt->user); |
7e82606e | 626 | authctxt->user = xstrdup(username); |
627 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
628 | xfree(username); | |
826f3a39 | 629 | |
630 | buffer_clear(m); | |
631 | ||
632 | if (pwent == NULL) { | |
633 | buffer_put_char(m, 0); | |
540d72c3 | 634 | authctxt->pw = fakepw(); |
826f3a39 | 635 | goto out; |
636 | } | |
637 | ||
638 | allowed = 1; | |
639 | authctxt->pw = pwent; | |
640 | authctxt->valid = 1; | |
641 | ||
642 | buffer_put_char(m, 1); | |
643 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
644 | buffer_put_cstring(m, pwent->pw_name); | |
645 | buffer_put_cstring(m, "*"); | |
646 | buffer_put_cstring(m, pwent->pw_gecos); | |
647 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
648 | buffer_put_cstring(m, pwent->pw_class); | |
649 | #endif | |
650 | buffer_put_cstring(m, pwent->pw_dir); | |
651 | buffer_put_cstring(m, pwent->pw_shell); | |
652 | ||
653 | out: | |
44a053a3 | 654 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
7e82606e | 655 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
826f3a39 | 656 | |
657 | /* For SSHv1 allow authentication now */ | |
658 | if (!compat20) | |
659 | monitor_permit_authentications(1); | |
660 | else { | |
661 | /* Allow service/style information on the auth context */ | |
662 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
663 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); | |
664 | } | |
665 | ||
666 | #ifdef USE_PAM | |
7cac2b65 | 667 | if (options.use_pam) |
668 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
826f3a39 | 669 | #endif |
dfddba3d | 670 | #ifdef SSH_AUDIT_EVENTS |
671 | monitor_permit(mon_dispatch, MONITOR_REQ_AUDIT_COMMAND, 1); | |
672 | #endif | |
826f3a39 | 673 | |
674 | return (0); | |
675 | } | |
676 | ||
7e82606e | 677 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
826f3a39 | 678 | { |
679 | char *banner; | |
680 | ||
681 | buffer_clear(m); | |
682 | banner = auth2_read_banner(); | |
683 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
7e82606e | 684 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
826f3a39 | 685 | |
686 | if (banner != NULL) | |
d03f4262 | 687 | xfree(banner); |
826f3a39 | 688 | |
689 | return (0); | |
690 | } | |
691 | ||
692 | int | |
7e82606e | 693 | mm_answer_authserv(int sock, Buffer *m) |
826f3a39 | 694 | { |
695 | monitor_permit_authentications(1); | |
696 | ||
697 | authctxt->service = buffer_get_string(m, NULL); | |
698 | authctxt->style = buffer_get_string(m, NULL); | |
699 | debug3("%s: service=%s, style=%s", | |
44a053a3 | 700 | __func__, authctxt->service, authctxt->style); |
826f3a39 | 701 | |
702 | if (strlen(authctxt->style) == 0) { | |
703 | xfree(authctxt->style); | |
704 | authctxt->style = NULL; | |
705 | } | |
706 | ||
707 | return (0); | |
708 | } | |
709 | ||
710 | int | |
7e82606e | 711 | mm_answer_authpassword(int sock, Buffer *m) |
826f3a39 | 712 | { |
713 | static int call_count; | |
714 | char *passwd; | |
d03f4262 | 715 | int authenticated; |
716 | u_int plen; | |
826f3a39 | 717 | |
718 | passwd = buffer_get_string(m, &plen); | |
719 | /* Only authenticate if the context is valid */ | |
44a053a3 | 720 | authenticated = options.password_authentication && |
7cac2b65 | 721 | auth_password(authctxt, passwd); |
826f3a39 | 722 | memset(passwd, 0, strlen(passwd)); |
723 | xfree(passwd); | |
724 | ||
725 | buffer_clear(m); | |
726 | buffer_put_int(m, authenticated); | |
727 | ||
44a053a3 | 728 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 729 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
826f3a39 | 730 | |
731 | call_count++; | |
732 | if (plen == 0 && call_count == 1) | |
733 | auth_method = "none"; | |
734 | else | |
735 | auth_method = "password"; | |
736 | ||
737 | /* Causes monitor loop to terminate if authenticated */ | |
738 | return (authenticated); | |
739 | } | |
740 | ||
741 | #ifdef BSD_AUTH | |
742 | int | |
7e82606e | 743 | mm_answer_bsdauthquery(int sock, Buffer *m) |
826f3a39 | 744 | { |
745 | char *name, *infotxt; | |
746 | u_int numprompts; | |
747 | u_int *echo_on; | |
748 | char **prompts; | |
bfe49944 | 749 | u_int success; |
826f3a39 | 750 | |
bfe49944 | 751 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
752 | &prompts, &echo_on) < 0 ? 0 : 1; | |
826f3a39 | 753 | |
754 | buffer_clear(m); | |
bfe49944 | 755 | buffer_put_int(m, success); |
756 | if (success) | |
826f3a39 | 757 | buffer_put_cstring(m, prompts[0]); |
758 | ||
bfe49944 | 759 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 760 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
826f3a39 | 761 | |
bfe49944 | 762 | if (success) { |
826f3a39 | 763 | xfree(name); |
764 | xfree(infotxt); | |
765 | xfree(prompts); | |
766 | xfree(echo_on); | |
767 | } | |
768 | ||
769 | return (0); | |
770 | } | |
771 | ||
772 | int | |
7e82606e | 773 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
826f3a39 | 774 | { |
775 | char *response; | |
776 | int authok; | |
777 | ||
778 | if (authctxt->as == 0) | |
44a053a3 | 779 | fatal("%s: no bsd auth session", __func__); |
826f3a39 | 780 | |
781 | response = buffer_get_string(m, NULL); | |
44a053a3 | 782 | authok = options.challenge_response_authentication && |
783 | auth_userresponse(authctxt->as, response, 0); | |
826f3a39 | 784 | authctxt->as = NULL; |
44a053a3 | 785 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
826f3a39 | 786 | xfree(response); |
787 | ||
788 | buffer_clear(m); | |
789 | buffer_put_int(m, authok); | |
790 | ||
44a053a3 | 791 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 792 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
826f3a39 | 793 | |
794 | auth_method = "bsdauth"; | |
795 | ||
796 | return (authok != 0); | |
797 | } | |
798 | #endif | |
799 | ||
800 | #ifdef SKEY | |
801 | int | |
7e82606e | 802 | mm_answer_skeyquery(int sock, Buffer *m) |
826f3a39 | 803 | { |
804 | struct skey skey; | |
805 | char challenge[1024]; | |
bfe49944 | 806 | u_int success; |
826f3a39 | 807 | |
12a403af | 808 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
809 | sizeof(challenge)) < 0 ? 0 : 1; | |
826f3a39 | 810 | |
811 | buffer_clear(m); | |
bfe49944 | 812 | buffer_put_int(m, success); |
813 | if (success) | |
826f3a39 | 814 | buffer_put_cstring(m, challenge); |
815 | ||
bfe49944 | 816 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 817 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
826f3a39 | 818 | |
819 | return (0); | |
820 | } | |
821 | ||
822 | int | |
7e82606e | 823 | mm_answer_skeyrespond(int sock, Buffer *m) |
826f3a39 | 824 | { |
825 | char *response; | |
826 | int authok; | |
827 | ||
828 | response = buffer_get_string(m, NULL); | |
829 | ||
44a053a3 | 830 | authok = (options.challenge_response_authentication && |
831 | authctxt->valid && | |
826f3a39 | 832 | skey_haskey(authctxt->pw->pw_name) == 0 && |
833 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
834 | ||
835 | xfree(response); | |
836 | ||
837 | buffer_clear(m); | |
838 | buffer_put_int(m, authok); | |
839 | ||
44a053a3 | 840 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 841 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
826f3a39 | 842 | |
843 | auth_method = "skey"; | |
844 | ||
845 | return (authok != 0); | |
846 | } | |
847 | #endif | |
848 | ||
849 | #ifdef USE_PAM | |
850 | int | |
7e82606e | 851 | mm_answer_pam_start(int sock, Buffer *m) |
826f3a39 | 852 | { |
7cac2b65 | 853 | if (!options.use_pam) |
854 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
855 | ||
12a403af | 856 | start_pam(authctxt); |
826f3a39 | 857 | |
7cac2b65 | 858 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
859 | ||
826f3a39 | 860 | return (0); |
861 | } | |
7cac2b65 | 862 | |
863 | int | |
7e82606e | 864 | mm_answer_pam_account(int sock, Buffer *m) |
7cac2b65 | 865 | { |
866 | u_int ret; | |
540d72c3 | 867 | |
7cac2b65 | 868 | if (!options.use_pam) |
869 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
870 | ||
871 | ret = do_pam_account(); | |
872 | ||
873 | buffer_put_int(m, ret); | |
dfddba3d | 874 | buffer_append(&loginmsg, "\0", 1); |
875 | buffer_put_cstring(m, buffer_ptr(&loginmsg)); | |
876 | buffer_clear(&loginmsg); | |
7cac2b65 | 877 | |
7e82606e | 878 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
7cac2b65 | 879 | |
880 | return (ret); | |
881 | } | |
882 | ||
883 | static void *sshpam_ctxt, *sshpam_authok; | |
884 | extern KbdintDevice sshpam_device; | |
885 | ||
886 | int | |
7e82606e | 887 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
7cac2b65 | 888 | { |
889 | ||
890 | debug3("%s", __func__); | |
891 | authctxt->user = buffer_get_string(m, NULL); | |
892 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
893 | sshpam_authok = NULL; | |
894 | buffer_clear(m); | |
895 | if (sshpam_ctxt != NULL) { | |
896 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
897 | buffer_put_int(m, 1); | |
898 | } else { | |
899 | buffer_put_int(m, 0); | |
900 | } | |
7e82606e | 901 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
7cac2b65 | 902 | return (0); |
903 | } | |
904 | ||
905 | int | |
7e82606e | 906 | mm_answer_pam_query(int sock, Buffer *m) |
7cac2b65 | 907 | { |
908 | char *name, *info, **prompts; | |
2ce0bfe4 | 909 | u_int i, num, *echo_on; |
910 | int ret; | |
7cac2b65 | 911 | |
912 | debug3("%s", __func__); | |
913 | sshpam_authok = NULL; | |
914 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
915 | if (ret == 0 && num == 0) | |
916 | sshpam_authok = sshpam_ctxt; | |
917 | if (num > 1 || name == NULL || info == NULL) | |
918 | ret = -1; | |
919 | buffer_clear(m); | |
920 | buffer_put_int(m, ret); | |
921 | buffer_put_cstring(m, name); | |
922 | xfree(name); | |
923 | buffer_put_cstring(m, info); | |
924 | xfree(info); | |
925 | buffer_put_int(m, num); | |
926 | for (i = 0; i < num; ++i) { | |
927 | buffer_put_cstring(m, prompts[i]); | |
928 | xfree(prompts[i]); | |
929 | buffer_put_int(m, echo_on[i]); | |
930 | } | |
931 | if (prompts != NULL) | |
932 | xfree(prompts); | |
933 | if (echo_on != NULL) | |
934 | xfree(echo_on); | |
7e82606e | 935 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
7cac2b65 | 936 | return (0); |
937 | } | |
938 | ||
939 | int | |
7e82606e | 940 | mm_answer_pam_respond(int sock, Buffer *m) |
7cac2b65 | 941 | { |
942 | char **resp; | |
2ce0bfe4 | 943 | u_int i, num; |
944 | int ret; | |
7cac2b65 | 945 | |
946 | debug3("%s", __func__); | |
947 | sshpam_authok = NULL; | |
948 | num = buffer_get_int(m); | |
949 | if (num > 0) { | |
950 | resp = xmalloc(num * sizeof(char *)); | |
951 | for (i = 0; i < num; ++i) | |
952 | resp[i] = buffer_get_string(m, NULL); | |
953 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
954 | for (i = 0; i < num; ++i) | |
955 | xfree(resp[i]); | |
956 | xfree(resp); | |
957 | } else { | |
958 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
959 | } | |
960 | buffer_clear(m); | |
961 | buffer_put_int(m, ret); | |
7e82606e | 962 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
7cac2b65 | 963 | auth_method = "keyboard-interactive/pam"; |
964 | if (ret == 0) | |
965 | sshpam_authok = sshpam_ctxt; | |
966 | return (0); | |
967 | } | |
968 | ||
969 | int | |
7e82606e | 970 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
7cac2b65 | 971 | { |
972 | ||
973 | debug3("%s", __func__); | |
974 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
975 | buffer_clear(m); | |
7e82606e | 976 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
7cac2b65 | 977 | return (sshpam_authok == sshpam_ctxt); |
978 | } | |
826f3a39 | 979 | #endif |
980 | ||
981 | static void | |
982 | mm_append_debug(Buffer *m) | |
983 | { | |
984 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
44a053a3 | 985 | debug3("%s: Appending debug messages for child", __func__); |
826f3a39 | 986 | buffer_append(m, buffer_ptr(&auth_debug), |
987 | buffer_len(&auth_debug)); | |
988 | buffer_clear(&auth_debug); | |
989 | } | |
990 | } | |
991 | ||
992 | int | |
7e82606e | 993 | mm_answer_keyallowed(int sock, Buffer *m) |
826f3a39 | 994 | { |
995 | Key *key; | |
d03f4262 | 996 | char *cuser, *chost; |
997 | u_char *blob; | |
826f3a39 | 998 | u_int bloblen; |
999 | enum mm_keytype type = 0; | |
1000 | int allowed = 0; | |
1001 | ||
44a053a3 | 1002 | debug3("%s entering", __func__); |
826f3a39 | 1003 | |
1004 | type = buffer_get_int(m); | |
1005 | cuser = buffer_get_string(m, NULL); | |
1006 | chost = buffer_get_string(m, NULL); | |
1007 | blob = buffer_get_string(m, &bloblen); | |
1008 | ||
1009 | key = key_from_blob(blob, bloblen); | |
1010 | ||
1011 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1012 | (!compat20 && type != MM_RSAHOSTKEY)) | |
44a053a3 | 1013 | fatal("%s: key type and protocol mismatch", __func__); |
826f3a39 | 1014 | |
44a053a3 | 1015 | debug3("%s: key_from_blob: %p", __func__, key); |
826f3a39 | 1016 | |
540d72c3 | 1017 | if (key != NULL && authctxt->valid) { |
8b32eddc | 1018 | switch (type) { |
826f3a39 | 1019 | case MM_USERKEY: |
44a053a3 | 1020 | allowed = options.pubkey_authentication && |
1021 | user_key_allowed(authctxt->pw, key); | |
826f3a39 | 1022 | break; |
1023 | case MM_HOSTKEY: | |
44a053a3 | 1024 | allowed = options.hostbased_authentication && |
1025 | hostbased_key_allowed(authctxt->pw, | |
826f3a39 | 1026 | cuser, chost, key); |
1027 | break; | |
1028 | case MM_RSAHOSTKEY: | |
1029 | key->type = KEY_RSA1; /* XXX */ | |
44a053a3 | 1030 | allowed = options.rhosts_rsa_authentication && |
1031 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
826f3a39 | 1032 | cuser, chost, key); |
1033 | break; | |
1034 | default: | |
44a053a3 | 1035 | fatal("%s: unknown key type %d", __func__, type); |
826f3a39 | 1036 | break; |
1037 | } | |
826f3a39 | 1038 | } |
bfe49944 | 1039 | if (key != NULL) |
1040 | key_free(key); | |
826f3a39 | 1041 | |
1042 | /* clear temporarily storage (used by verify) */ | |
1043 | monitor_reset_key_state(); | |
1044 | ||
1045 | if (allowed) { | |
1046 | /* Save temporarily for comparison in verify */ | |
1047 | key_blob = blob; | |
1048 | key_bloblen = bloblen; | |
1049 | key_blobtype = type; | |
1050 | hostbased_cuser = cuser; | |
1051 | hostbased_chost = chost; | |
1052 | } | |
1053 | ||
1054 | debug3("%s: key %p is %s", | |
44a053a3 | 1055 | __func__, key, allowed ? "allowed" : "disallowed"); |
826f3a39 | 1056 | |
1057 | buffer_clear(m); | |
1058 | buffer_put_int(m, allowed); | |
bfe49944 | 1059 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1060 | |
1061 | mm_append_debug(m); | |
1062 | ||
7e82606e | 1063 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
826f3a39 | 1064 | |
1065 | if (type == MM_RSAHOSTKEY) | |
1066 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1067 | ||
1068 | return (0); | |
1069 | } | |
1070 | ||
1071 | static int | |
1072 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1073 | { | |
1074 | Buffer b; | |
d03f4262 | 1075 | char *p; |
826f3a39 | 1076 | u_int len; |
1077 | int fail = 0; | |
826f3a39 | 1078 | |
1079 | buffer_init(&b); | |
1080 | buffer_append(&b, data, datalen); | |
1081 | ||
1082 | if (datafellows & SSH_OLD_SESSIONID) { | |
44a053a3 | 1083 | p = buffer_ptr(&b); |
1084 | len = buffer_len(&b); | |
1085 | if ((session_id2 == NULL) || | |
1086 | (len < session_id2_len) || | |
1087 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1088 | fail++; | |
826f3a39 | 1089 | buffer_consume(&b, session_id2_len); |
1090 | } else { | |
44a053a3 | 1091 | p = buffer_get_string(&b, &len); |
1092 | if ((session_id2 == NULL) || | |
1093 | (len != session_id2_len) || | |
1094 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1095 | fail++; |
44a053a3 | 1096 | xfree(p); |
826f3a39 | 1097 | } |
1098 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1099 | fail++; | |
1100 | p = buffer_get_string(&b, NULL); | |
1101 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1102 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1103 | authctxt->user, p); |
1104 | fail++; | |
1105 | } | |
1106 | xfree(p); | |
1107 | buffer_skip_string(&b); | |
1108 | if (datafellows & SSH_BUG_PKAUTH) { | |
1109 | if (!buffer_get_char(&b)) | |
1110 | fail++; | |
1111 | } else { | |
1112 | p = buffer_get_string(&b, NULL); | |
1113 | if (strcmp("publickey", p) != 0) | |
1114 | fail++; | |
1115 | xfree(p); | |
1116 | if (!buffer_get_char(&b)) | |
1117 | fail++; | |
1118 | buffer_skip_string(&b); | |
1119 | } | |
1120 | buffer_skip_string(&b); | |
1121 | if (buffer_len(&b) != 0) | |
1122 | fail++; | |
1123 | buffer_free(&b); | |
1124 | return (fail == 0); | |
1125 | } | |
1126 | ||
1127 | static int | |
d03f4262 | 1128 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1129 | char *chost) | |
826f3a39 | 1130 | { |
1131 | Buffer b; | |
d03f4262 | 1132 | char *p; |
826f3a39 | 1133 | u_int len; |
1134 | int fail = 0; | |
826f3a39 | 1135 | |
1136 | buffer_init(&b); | |
1137 | buffer_append(&b, data, datalen); | |
1138 | ||
44a053a3 | 1139 | p = buffer_get_string(&b, &len); |
1140 | if ((session_id2 == NULL) || | |
1141 | (len != session_id2_len) || | |
1142 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1143 | fail++; |
44a053a3 | 1144 | xfree(p); |
1145 | ||
826f3a39 | 1146 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1147 | fail++; | |
1148 | p = buffer_get_string(&b, NULL); | |
1149 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1150 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1151 | authctxt->user, p); |
1152 | fail++; | |
1153 | } | |
1154 | xfree(p); | |
1155 | buffer_skip_string(&b); /* service */ | |
1156 | p = buffer_get_string(&b, NULL); | |
1157 | if (strcmp(p, "hostbased") != 0) | |
1158 | fail++; | |
1159 | xfree(p); | |
1160 | buffer_skip_string(&b); /* pkalg */ | |
1161 | buffer_skip_string(&b); /* pkblob */ | |
1162 | ||
1163 | /* verify client host, strip trailing dot if necessary */ | |
1164 | p = buffer_get_string(&b, NULL); | |
1165 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1166 | p[len - 1] = '\0'; | |
1167 | if (strcmp(p, chost) != 0) | |
1168 | fail++; | |
1169 | xfree(p); | |
1170 | ||
1171 | /* verify client user */ | |
1172 | p = buffer_get_string(&b, NULL); | |
1173 | if (strcmp(p, cuser) != 0) | |
1174 | fail++; | |
1175 | xfree(p); | |
1176 | ||
1177 | if (buffer_len(&b) != 0) | |
1178 | fail++; | |
1179 | buffer_free(&b); | |
1180 | return (fail == 0); | |
1181 | } | |
1182 | ||
1183 | int | |
7e82606e | 1184 | mm_answer_keyverify(int sock, Buffer *m) |
826f3a39 | 1185 | { |
1186 | Key *key; | |
1187 | u_char *signature, *data, *blob; | |
1188 | u_int signaturelen, datalen, bloblen; | |
1189 | int verified = 0; | |
1190 | int valid_data = 0; | |
1191 | ||
1192 | blob = buffer_get_string(m, &bloblen); | |
1193 | signature = buffer_get_string(m, &signaturelen); | |
1194 | data = buffer_get_string(m, &datalen); | |
1195 | ||
1196 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
1197 | !monitor_allowed_key(blob, bloblen)) | |
44a053a3 | 1198 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1199 | |
1200 | key = key_from_blob(blob, bloblen); | |
1201 | if (key == NULL) | |
44a053a3 | 1202 | fatal("%s: bad public key blob", __func__); |
826f3a39 | 1203 | |
1204 | switch (key_blobtype) { | |
1205 | case MM_USERKEY: | |
1206 | valid_data = monitor_valid_userblob(data, datalen); | |
1207 | break; | |
1208 | case MM_HOSTKEY: | |
1209 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1210 | hostbased_cuser, hostbased_chost); | |
1211 | break; | |
1212 | default: | |
1213 | valid_data = 0; | |
1214 | break; | |
1215 | } | |
1216 | if (!valid_data) | |
44a053a3 | 1217 | fatal("%s: bad signature data blob", __func__); |
826f3a39 | 1218 | |
1219 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1220 | debug3("%s: key %p signature %s", | |
44a053a3 | 1221 | __func__, key, verified ? "verified" : "unverified"); |
826f3a39 | 1222 | |
1223 | key_free(key); | |
1224 | xfree(blob); | |
1225 | xfree(signature); | |
1226 | xfree(data); | |
1227 | ||
276b07a3 | 1228 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1229 | ||
826f3a39 | 1230 | monitor_reset_key_state(); |
1231 | ||
1232 | buffer_clear(m); | |
1233 | buffer_put_int(m, verified); | |
7e82606e | 1234 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
826f3a39 | 1235 | |
826f3a39 | 1236 | return (verified); |
1237 | } | |
1238 | ||
1239 | static void | |
1240 | mm_record_login(Session *s, struct passwd *pw) | |
1241 | { | |
1242 | socklen_t fromlen; | |
1243 | struct sockaddr_storage from; | |
1244 | ||
1245 | /* | |
1246 | * Get IP address of client. If the connection is not a socket, let | |
1247 | * the address be 0.0.0.0. | |
1248 | */ | |
1249 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 1250 | fromlen = sizeof(from); |
826f3a39 | 1251 | if (packet_connection_is_on_socket()) { |
826f3a39 | 1252 | if (getpeername(packet_get_connection_in(), |
1253 | (struct sockaddr *) & from, &fromlen) < 0) { | |
1254 | debug("getpeername: %.100s", strerror(errno)); | |
540d72c3 | 1255 | cleanup_exit(255); |
826f3a39 | 1256 | } |
1257 | } | |
1258 | /* Record that there was a login on that tty from the remote host. */ | |
1259 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
7cac2b65 | 1260 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d03f4262 | 1261 | (struct sockaddr *)&from, fromlen); |
826f3a39 | 1262 | } |
1263 | ||
1264 | static void | |
1265 | mm_session_close(Session *s) | |
1266 | { | |
7cac2b65 | 1267 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
826f3a39 | 1268 | if (s->ttyfd != -1) { |
44a053a3 | 1269 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
826f3a39 | 1270 | session_pty_cleanup2(s); |
1271 | } | |
1272 | s->used = 0; | |
1273 | } | |
1274 | ||
1275 | int | |
7e82606e | 1276 | mm_answer_pty(int sock, Buffer *m) |
826f3a39 | 1277 | { |
1278 | extern struct monitor *pmonitor; | |
1279 | Session *s; | |
1280 | int res, fd0; | |
1281 | ||
44a053a3 | 1282 | debug3("%s entering", __func__); |
826f3a39 | 1283 | |
1284 | buffer_clear(m); | |
1285 | s = session_new(); | |
1286 | if (s == NULL) | |
1287 | goto error; | |
1288 | s->authctxt = authctxt; | |
1289 | s->pw = authctxt->pw; | |
1290 | s->pid = pmonitor->m_pid; | |
1291 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); | |
1292 | if (res == 0) | |
1293 | goto error; | |
826f3a39 | 1294 | pty_setowner(authctxt->pw, s->tty); |
1295 | ||
1296 | buffer_put_int(m, 1); | |
1297 | buffer_put_cstring(m, s->tty); | |
826f3a39 | 1298 | |
1299 | /* We need to trick ttyslot */ | |
1300 | if (dup2(s->ttyfd, 0) == -1) | |
44a053a3 | 1301 | fatal("%s: dup2", __func__); |
826f3a39 | 1302 | |
1303 | mm_record_login(s, authctxt->pw); | |
1304 | ||
1305 | /* Now we can close the file descriptor again */ | |
1306 | close(0); | |
1307 | ||
7e82606e | 1308 | /* send messages generated by record_login */ |
1309 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1310 | buffer_clear(&loginmsg); | |
1311 | ||
1312 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1313 | ||
1314 | mm_send_fd(sock, s->ptyfd); | |
1315 | mm_send_fd(sock, s->ttyfd); | |
1316 | ||
826f3a39 | 1317 | /* make sure nothing uses fd 0 */ |
1318 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
44a053a3 | 1319 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
826f3a39 | 1320 | if (fd0 != 0) |
44a053a3 | 1321 | error("%s: fd0 %d != 0", __func__, fd0); |
826f3a39 | 1322 | |
1323 | /* slave is not needed */ | |
1324 | close(s->ttyfd); | |
1325 | s->ttyfd = s->ptyfd; | |
1326 | /* no need to dup() because nobody closes ptyfd */ | |
1327 | s->ptymaster = s->ptyfd; | |
1328 | ||
44a053a3 | 1329 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
826f3a39 | 1330 | |
1331 | return (0); | |
1332 | ||
1333 | error: | |
1334 | if (s != NULL) | |
1335 | mm_session_close(s); | |
1336 | buffer_put_int(m, 0); | |
7e82606e | 1337 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
826f3a39 | 1338 | return (0); |
1339 | } | |
1340 | ||
1341 | int | |
7e82606e | 1342 | mm_answer_pty_cleanup(int sock, Buffer *m) |
826f3a39 | 1343 | { |
1344 | Session *s; | |
1345 | char *tty; | |
1346 | ||
44a053a3 | 1347 | debug3("%s entering", __func__); |
826f3a39 | 1348 | |
1349 | tty = buffer_get_string(m, NULL); | |
1350 | if ((s = session_by_tty(tty)) != NULL) | |
1351 | mm_session_close(s); | |
1352 | buffer_clear(m); | |
1353 | xfree(tty); | |
1354 | return (0); | |
1355 | } | |
1356 | ||
1357 | int | |
7e82606e | 1358 | mm_answer_sesskey(int sock, Buffer *m) |
826f3a39 | 1359 | { |
1360 | BIGNUM *p; | |
1361 | int rsafail; | |
1362 | ||
1363 | /* Turn off permissions */ | |
dfddba3d | 1364 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
826f3a39 | 1365 | |
1366 | if ((p = BN_new()) == NULL) | |
44a053a3 | 1367 | fatal("%s: BN_new", __func__); |
826f3a39 | 1368 | |
1369 | buffer_get_bignum2(m, p); | |
1370 | ||
1371 | rsafail = ssh1_session_key(p); | |
1372 | ||
1373 | buffer_clear(m); | |
1374 | buffer_put_int(m, rsafail); | |
1375 | buffer_put_bignum2(m, p); | |
1376 | ||
1377 | BN_clear_free(p); | |
1378 | ||
7e82606e | 1379 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
826f3a39 | 1380 | |
1381 | /* Turn on permissions for sessid passing */ | |
1382 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1383 | ||
1384 | return (0); | |
1385 | } | |
1386 | ||
1387 | int | |
7e82606e | 1388 | mm_answer_sessid(int sock, Buffer *m) |
826f3a39 | 1389 | { |
1390 | int i; | |
1391 | ||
44a053a3 | 1392 | debug3("%s entering", __func__); |
826f3a39 | 1393 | |
1394 | if (buffer_len(m) != 16) | |
44a053a3 | 1395 | fatal("%s: bad ssh1 session id", __func__); |
826f3a39 | 1396 | for (i = 0; i < 16; i++) |
1397 | session_id[i] = buffer_get_char(m); | |
1398 | ||
1399 | /* Turn on permissions for getpwnam */ | |
1400 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1401 | ||
1402 | return (0); | |
1403 | } | |
1404 | ||
1405 | int | |
7e82606e | 1406 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
826f3a39 | 1407 | { |
1408 | BIGNUM *client_n; | |
1409 | Key *key = NULL; | |
1410 | u_char *blob = NULL; | |
1411 | u_int blen = 0; | |
1412 | int allowed = 0; | |
1413 | ||
44a053a3 | 1414 | debug3("%s entering", __func__); |
826f3a39 | 1415 | |
44a053a3 | 1416 | if (options.rsa_authentication && authctxt->valid) { |
826f3a39 | 1417 | if ((client_n = BN_new()) == NULL) |
44a053a3 | 1418 | fatal("%s: BN_new", __func__); |
826f3a39 | 1419 | buffer_get_bignum2(m, client_n); |
1420 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1421 | BN_clear_free(client_n); | |
1422 | } | |
1423 | buffer_clear(m); | |
1424 | buffer_put_int(m, allowed); | |
bfe49944 | 1425 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1426 | |
1427 | /* clear temporarily storage (used by generate challenge) */ | |
1428 | monitor_reset_key_state(); | |
1429 | ||
1430 | if (allowed && key != NULL) { | |
1431 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1432 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 1433 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 1434 | buffer_put_string(m, blob, blen); |
1435 | ||
1436 | /* Save temporarily for comparison in verify */ | |
1437 | key_blob = blob; | |
1438 | key_bloblen = blen; | |
1439 | key_blobtype = MM_RSAUSERKEY; | |
826f3a39 | 1440 | } |
bfe49944 | 1441 | if (key != NULL) |
1442 | key_free(key); | |
826f3a39 | 1443 | |
1444 | mm_append_debug(m); | |
1445 | ||
7e82606e | 1446 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
826f3a39 | 1447 | |
1448 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1449 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1450 | return (0); | |
1451 | } | |
1452 | ||
1453 | int | |
7e82606e | 1454 | mm_answer_rsa_challenge(int sock, Buffer *m) |
826f3a39 | 1455 | { |
1456 | Key *key = NULL; | |
1457 | u_char *blob; | |
1458 | u_int blen; | |
1459 | ||
44a053a3 | 1460 | debug3("%s entering", __func__); |
826f3a39 | 1461 | |
1462 | if (!authctxt->valid) | |
44a053a3 | 1463 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1464 | blob = buffer_get_string(m, &blen); |
1465 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1466 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1467 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1468 | fatal("%s: key type mismatch", __func__); |
826f3a39 | 1469 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1470 | fatal("%s: received bad key", __func__); |
826f3a39 | 1471 | |
1472 | if (ssh1_challenge) | |
1473 | BN_clear_free(ssh1_challenge); | |
1474 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1475 | ||
1476 | buffer_clear(m); | |
1477 | buffer_put_bignum2(m, ssh1_challenge); | |
1478 | ||
44a053a3 | 1479 | debug3("%s sending reply", __func__); |
7e82606e | 1480 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
826f3a39 | 1481 | |
1482 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
bfe49944 | 1483 | |
1484 | xfree(blob); | |
1485 | key_free(key); | |
826f3a39 | 1486 | return (0); |
1487 | } | |
1488 | ||
1489 | int | |
7e82606e | 1490 | mm_answer_rsa_response(int sock, Buffer *m) |
826f3a39 | 1491 | { |
1492 | Key *key = NULL; | |
1493 | u_char *blob, *response; | |
1494 | u_int blen, len; | |
1495 | int success; | |
1496 | ||
44a053a3 | 1497 | debug3("%s entering", __func__); |
826f3a39 | 1498 | |
1499 | if (!authctxt->valid) | |
44a053a3 | 1500 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1501 | if (ssh1_challenge == NULL) |
44a053a3 | 1502 | fatal("%s: no ssh1_challenge", __func__); |
826f3a39 | 1503 | |
1504 | blob = buffer_get_string(m, &blen); | |
1505 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1506 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1507 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1508 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
826f3a39 | 1509 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1510 | fatal("%s: received bad key", __func__); |
826f3a39 | 1511 | response = buffer_get_string(m, &len); |
1512 | if (len != 16) | |
44a053a3 | 1513 | fatal("%s: received bad response to challenge", __func__); |
826f3a39 | 1514 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1515 | ||
bfe49944 | 1516 | xfree(blob); |
826f3a39 | 1517 | key_free(key); |
1518 | xfree(response); | |
1519 | ||
1520 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1521 | ||
1522 | /* reset state */ | |
1523 | BN_clear_free(ssh1_challenge); | |
1524 | ssh1_challenge = NULL; | |
1525 | monitor_reset_key_state(); | |
1526 | ||
1527 | buffer_clear(m); | |
1528 | buffer_put_int(m, success); | |
7e82606e | 1529 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
826f3a39 | 1530 | |
1531 | return (success); | |
1532 | } | |
1533 | ||
1534 | int | |
7e82606e | 1535 | mm_answer_term(int sock, Buffer *req) |
826f3a39 | 1536 | { |
1537 | extern struct monitor *pmonitor; | |
1538 | int res, status; | |
1539 | ||
44a053a3 | 1540 | debug3("%s: tearing down sessions", __func__); |
826f3a39 | 1541 | |
1542 | /* The child is terminating */ | |
1543 | session_destroy_all(&mm_session_close); | |
1544 | ||
1545 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) | |
1546 | if (errno != EINTR) | |
1547 | exit(1); | |
1548 | ||
1549 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1550 | ||
1551 | /* Terminate process */ | |
7e82606e | 1552 | exit(res); |
826f3a39 | 1553 | } |
1554 | ||
dfddba3d | 1555 | #ifdef SSH_AUDIT_EVENTS |
1556 | /* Report that an audit event occurred */ | |
1557 | int | |
1558 | mm_answer_audit_event(int socket, Buffer *m) | |
1559 | { | |
1560 | ssh_audit_event_t event; | |
1561 | ||
1562 | debug3("%s entering", __func__); | |
1563 | ||
1564 | event = buffer_get_int(m); | |
dfddba3d | 1565 | switch(event) { |
1566 | case SSH_AUTH_FAIL_PUBKEY: | |
1567 | case SSH_AUTH_FAIL_HOSTBASED: | |
1568 | case SSH_AUTH_FAIL_GSSAPI: | |
1569 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1570 | case SSH_LOGIN_ROOT_DENIED: | |
1571 | case SSH_CONNECTION_CLOSE: | |
1572 | case SSH_INVALID_USER: | |
1573 | audit_event(event); | |
1574 | break; | |
1575 | default: | |
1576 | fatal("Audit event type %d not permitted", event); | |
1577 | } | |
1578 | ||
1579 | return (0); | |
1580 | } | |
1581 | ||
1582 | int | |
1583 | mm_answer_audit_command(int socket, Buffer *m) | |
1584 | { | |
1585 | u_int len; | |
1586 | char *cmd; | |
1587 | ||
1588 | debug3("%s entering", __func__); | |
1589 | cmd = buffer_get_string(m, &len); | |
1590 | /* sanity check command, if so how? */ | |
1591 | audit_run_command(cmd); | |
1592 | xfree(cmd); | |
dfddba3d | 1593 | return (0); |
1594 | } | |
1595 | #endif /* SSH_AUDIT_EVENTS */ | |
1596 | ||
826f3a39 | 1597 | void |
1598 | monitor_apply_keystate(struct monitor *pmonitor) | |
1599 | { | |
1600 | if (compat20) { | |
1601 | set_newkeys(MODE_IN); | |
1602 | set_newkeys(MODE_OUT); | |
1603 | } else { | |
826f3a39 | 1604 | packet_set_protocol_flags(child_state.ssh1protoflags); |
44a053a3 | 1605 | packet_set_encryption_key(child_state.ssh1key, |
1606 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1607 | xfree(child_state.ssh1key); | |
826f3a39 | 1608 | } |
1609 | ||
44a053a3 | 1610 | /* for rc4 and other stateful ciphers */ |
826f3a39 | 1611 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1612 | xfree(child_state.keyout); | |
1613 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1614 | xfree(child_state.keyin); | |
1615 | ||
1616 | if (!compat20) { | |
1617 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1618 | xfree(child_state.ivout); | |
1619 | packet_set_iv(MODE_IN, child_state.ivin); | |
1620 | xfree(child_state.ivin); | |
1621 | } | |
1622 | ||
1623 | memcpy(&incoming_stream, &child_state.incoming, | |
1624 | sizeof(incoming_stream)); | |
1625 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1626 | sizeof(outgoing_stream)); | |
1627 | ||
1628 | /* Update with new address */ | |
44a053a3 | 1629 | if (options.compression) |
1630 | mm_init_compression(pmonitor->m_zlib); | |
826f3a39 | 1631 | |
1632 | /* Network I/O buffers */ | |
1633 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1634 | buffer_clear(&input); | |
1635 | buffer_append(&input, child_state.input, child_state.ilen); | |
1636 | memset(child_state.input, 0, child_state.ilen); | |
1637 | xfree(child_state.input); | |
1638 | ||
1639 | buffer_clear(&output); | |
1640 | buffer_append(&output, child_state.output, child_state.olen); | |
1641 | memset(child_state.output, 0, child_state.olen); | |
1642 | xfree(child_state.output); | |
1643 | } | |
1644 | ||
1645 | static Kex * | |
1646 | mm_get_kex(Buffer *m) | |
1647 | { | |
1648 | Kex *kex; | |
1649 | void *blob; | |
1650 | u_int bloblen; | |
1651 | ||
1652 | kex = xmalloc(sizeof(*kex)); | |
1653 | memset(kex, 0, sizeof(*kex)); | |
1654 | kex->session_id = buffer_get_string(m, &kex->session_id_len); | |
44a053a3 | 1655 | if ((session_id2 == NULL) || |
1656 | (kex->session_id_len != session_id2_len) || | |
1657 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1658 | fatal("mm_get_get: internal error: bad session id"); | |
826f3a39 | 1659 | kex->we_need = buffer_get_int(m); |
bfe49944 | 1660 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
7e82606e | 1661 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
bfe49944 | 1662 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
23987cb8 | 1663 | #ifdef GSSAPI |
7cac2b65 | 1664 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; |
fe4ad273 | 1665 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server; |
23987cb8 | 1666 | #endif |
826f3a39 | 1667 | kex->server = 1; |
1668 | kex->hostkey_type = buffer_get_int(m); | |
1669 | kex->kex_type = buffer_get_int(m); | |
1670 | blob = buffer_get_string(m, &bloblen); | |
1671 | buffer_init(&kex->my); | |
1672 | buffer_append(&kex->my, blob, bloblen); | |
1673 | xfree(blob); | |
1674 | blob = buffer_get_string(m, &bloblen); | |
1675 | buffer_init(&kex->peer); | |
1676 | buffer_append(&kex->peer, blob, bloblen); | |
1677 | xfree(blob); | |
1678 | kex->done = 1; | |
1679 | kex->flags = buffer_get_int(m); | |
1680 | kex->client_version_string = buffer_get_string(m, NULL); | |
1681 | kex->server_version_string = buffer_get_string(m, NULL); | |
1682 | kex->load_host_key=&get_hostkey_by_type; | |
1683 | kex->host_key_index=&get_hostkey_index; | |
1684 | ||
1685 | return (kex); | |
1686 | } | |
1687 | ||
1688 | /* This function requries careful sanity checking */ | |
1689 | ||
1690 | void | |
1691 | mm_get_keystate(struct monitor *pmonitor) | |
1692 | { | |
1693 | Buffer m; | |
1694 | u_char *blob, *p; | |
1695 | u_int bloblen, plen; | |
7cac2b65 | 1696 | u_int32_t seqnr, packets; |
1697 | u_int64_t blocks; | |
826f3a39 | 1698 | |
44a053a3 | 1699 | debug3("%s: Waiting for new keys", __func__); |
826f3a39 | 1700 | |
1701 | buffer_init(&m); | |
1702 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); | |
1703 | if (!compat20) { | |
1704 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1705 | child_state.ssh1cipher = buffer_get_int(&m); | |
44a053a3 | 1706 | child_state.ssh1key = buffer_get_string(&m, |
1707 | &child_state.ssh1keylen); | |
826f3a39 | 1708 | child_state.ivout = buffer_get_string(&m, |
1709 | &child_state.ivoutlen); | |
1710 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1711 | goto skip; | |
1712 | } else { | |
1713 | /* Get the Kex for rekeying */ | |
1714 | *pmonitor->m_pkex = mm_get_kex(&m); | |
1715 | } | |
1716 | ||
1717 | blob = buffer_get_string(&m, &bloblen); | |
1718 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1719 | xfree(blob); | |
1720 | ||
44a053a3 | 1721 | debug3("%s: Waiting for second key", __func__); |
826f3a39 | 1722 | blob = buffer_get_string(&m, &bloblen); |
1723 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1724 | xfree(blob); | |
1725 | ||
1726 | /* Now get sequence numbers for the packets */ | |
7cac2b65 | 1727 | seqnr = buffer_get_int(&m); |
1728 | blocks = buffer_get_int64(&m); | |
1729 | packets = buffer_get_int(&m); | |
1730 | packet_set_state(MODE_OUT, seqnr, blocks, packets); | |
1731 | seqnr = buffer_get_int(&m); | |
1732 | blocks = buffer_get_int64(&m); | |
1733 | packets = buffer_get_int(&m); | |
1734 | packet_set_state(MODE_IN, seqnr, blocks, packets); | |
826f3a39 | 1735 | |
1736 | skip: | |
1737 | /* Get the key context */ | |
1738 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1739 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1740 | ||
44a053a3 | 1741 | debug3("%s: Getting compression state", __func__); |
826f3a39 | 1742 | /* Get compression state */ |
1743 | p = buffer_get_string(&m, &plen); | |
1744 | if (plen != sizeof(child_state.outgoing)) | |
44a053a3 | 1745 | fatal("%s: bad request size", __func__); |
826f3a39 | 1746 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1747 | xfree(p); | |
1748 | ||
1749 | p = buffer_get_string(&m, &plen); | |
1750 | if (plen != sizeof(child_state.incoming)) | |
44a053a3 | 1751 | fatal("%s: bad request size", __func__); |
826f3a39 | 1752 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1753 | xfree(p); | |
1754 | ||
1755 | /* Network I/O buffers */ | |
44a053a3 | 1756 | debug3("%s: Getting Network I/O buffers", __func__); |
826f3a39 | 1757 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1758 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1759 | ||
1760 | buffer_free(&m); | |
1761 | } | |
1762 | ||
1763 | ||
1764 | /* Allocation functions for zlib */ | |
1765 | void * | |
1766 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1767 | { | |
bfe49944 | 1768 | size_t len = (size_t) size * ncount; |
826f3a39 | 1769 | void *address; |
1770 | ||
d03f4262 | 1771 | if (len == 0 || ncount > SIZE_T_MAX / size) |
276b07a3 | 1772 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1773 | ||
1774 | address = mm_malloc(mm, len); | |
826f3a39 | 1775 | |
1776 | return (address); | |
1777 | } | |
1778 | ||
1779 | void | |
1780 | mm_zfree(struct mm_master *mm, void *address) | |
1781 | { | |
1782 | mm_free(mm, address); | |
1783 | } | |
1784 | ||
1785 | void | |
1786 | mm_init_compression(struct mm_master *mm) | |
1787 | { | |
1788 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1789 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1790 | outgoing_stream.opaque = mm; | |
1791 | ||
1792 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1793 | incoming_stream.zfree = (free_func)mm_zfree; | |
1794 | incoming_stream.opaque = mm; | |
1795 | } | |
1796 | ||
1797 | /* XXX */ | |
1798 | ||
1799 | #define FD_CLOSEONEXEC(x) do { \ | |
1800 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1801 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1802 | } while (0) | |
1803 | ||
1804 | static void | |
1805 | monitor_socketpair(int *pair) | |
1806 | { | |
1807 | #ifdef HAVE_SOCKETPAIR | |
1808 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) | |
44a053a3 | 1809 | fatal("%s: socketpair", __func__); |
826f3a39 | 1810 | #else |
1811 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
44a053a3 | 1812 | __func__); |
826f3a39 | 1813 | #endif |
1814 | FD_CLOSEONEXEC(pair[0]); | |
1815 | FD_CLOSEONEXEC(pair[1]); | |
1816 | } | |
1817 | ||
1818 | #define MM_MEMSIZE 65536 | |
1819 | ||
1820 | struct monitor * | |
1821 | monitor_init(void) | |
1822 | { | |
1823 | struct monitor *mon; | |
1824 | int pair[2]; | |
1825 | ||
1826 | mon = xmalloc(sizeof(*mon)); | |
1827 | ||
540d72c3 | 1828 | mon->m_pid = 0; |
826f3a39 | 1829 | monitor_socketpair(pair); |
1830 | ||
1831 | mon->m_recvfd = pair[0]; | |
1832 | mon->m_sendfd = pair[1]; | |
1833 | ||
1834 | /* Used to share zlib space across processes */ | |
44a053a3 | 1835 | if (options.compression) { |
1836 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1837 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
826f3a39 | 1838 | |
44a053a3 | 1839 | /* Compression needs to share state across borders */ |
1840 | mm_init_compression(mon->m_zlib); | |
1841 | } | |
826f3a39 | 1842 | |
1843 | return mon; | |
1844 | } | |
1845 | ||
1846 | void | |
1847 | monitor_reinit(struct monitor *mon) | |
1848 | { | |
1849 | int pair[2]; | |
1850 | ||
1851 | monitor_socketpair(pair); | |
1852 | ||
1853 | mon->m_recvfd = pair[0]; | |
1854 | mon->m_sendfd = pair[1]; | |
1855 | } | |
b59afbfe | 1856 | |
7cac2b65 | 1857 | #ifdef GSSAPI |
1858 | int | |
7e82606e | 1859 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7cac2b65 | 1860 | { |
7e82606e | 1861 | gss_OID_desc goid; |
7cac2b65 | 1862 | OM_uint32 major; |
1863 | u_int len; | |
b59afbfe | 1864 | |
7e82606e | 1865 | goid.elements = buffer_get_string(m, &len); |
1866 | goid.length = len; | |
b59afbfe | 1867 | |
7e82606e | 1868 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
e23e524c | 1869 | |
7e82606e | 1870 | xfree(goid.elements); |
7cac2b65 | 1871 | |
1872 | buffer_clear(m); | |
1873 | buffer_put_int(m, major); | |
1874 | ||
7e82606e | 1875 | mm_request_send(sock,MONITOR_ANS_GSSSETUP, m); |
7cac2b65 | 1876 | |
1877 | /* Now we have a context, enable the step */ | |
1878 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1879 | ||
1880 | return (0); | |
b59afbfe | 1881 | } |
1882 | ||
1883 | int | |
7e82606e | 1884 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7cac2b65 | 1885 | { |
1886 | gss_buffer_desc in; | |
1887 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
1888 | OM_uint32 major,minor; | |
1889 | OM_uint32 flags = 0; /* GSI needs this */ | |
1890 | u_int len; | |
b59afbfe | 1891 | |
7cac2b65 | 1892 | in.value = buffer_get_string(m, &len); |
1893 | in.length = len; | |
1894 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); | |
1895 | xfree(in.value); | |
b59afbfe | 1896 | |
7cac2b65 | 1897 | buffer_clear(m); |
1898 | buffer_put_int(m, major); | |
1899 | buffer_put_string(m, out.value, out.length); | |
1900 | buffer_put_int(m, flags); | |
7e82606e | 1901 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
b59afbfe | 1902 | |
7cac2b65 | 1903 | gss_release_buffer(&minor, &out); |
b59afbfe | 1904 | |
e23e524c | 1905 | if (major==GSS_S_COMPLETE) { |
7cac2b65 | 1906 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1907 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1908 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); | |
540d72c3 | 1909 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
fe4ad273 | 1910 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); |
e23e524c | 1911 | } |
7cac2b65 | 1912 | return (0); |
b59afbfe | 1913 | } |
e23e524c | 1914 | |
540d72c3 | 1915 | int |
7e82606e | 1916 | mm_answer_gss_checkmic(int sock, Buffer *m) |
540d72c3 | 1917 | { |
1918 | gss_buffer_desc gssbuf, mic; | |
1919 | OM_uint32 ret; | |
1920 | u_int len; | |
1921 | ||
1922 | gssbuf.value = buffer_get_string(m, &len); | |
1923 | gssbuf.length = len; | |
1924 | mic.value = buffer_get_string(m, &len); | |
1925 | mic.length = len; | |
1926 | ||
1927 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); | |
1928 | ||
1929 | xfree(gssbuf.value); | |
1930 | xfree(mic.value); | |
1931 | ||
1932 | buffer_clear(m); | |
1933 | buffer_put_int(m, ret); | |
1934 | ||
7e82606e | 1935 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
540d72c3 | 1936 | |
1937 | if (!GSS_ERROR(ret)) | |
1938 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1939 | ||
1940 | return (0); | |
1941 | } | |
1942 | ||
b59afbfe | 1943 | int |
7e82606e | 1944 | mm_answer_gss_userok(int sock, Buffer *m) |
7cac2b65 | 1945 | { |
b59afbfe | 1946 | int authenticated; |
1947 | ||
7cac2b65 | 1948 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); |
b59afbfe | 1949 | |
7cac2b65 | 1950 | buffer_clear(m); |
1951 | buffer_put_int(m, authenticated); | |
b59afbfe | 1952 | |
7cac2b65 | 1953 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 1954 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
b59afbfe | 1955 | |
540d72c3 | 1956 | auth_method="gssapi-with-mic"; |
7cac2b65 | 1957 | |
1958 | /* Monitor loop will terminate if authenticated */ | |
1959 | return (authenticated); | |
b59afbfe | 1960 | } |
23987cb8 | 1961 | |
fe4ad273 | 1962 | int |
1963 | mm_answer_gss_sign(int socket, Buffer *m) | |
1964 | { | |
1965 | gss_buffer_desc data; | |
1966 | gss_buffer_desc hash = GSS_C_EMPTY_BUFFER; | |
1967 | OM_uint32 major, minor; | |
77e22b94 | 1968 | u_int len; |
b59afbfe | 1969 | |
fe4ad273 | 1970 | data.value = buffer_get_string(m, &len); |
77e22b94 | 1971 | data.length = len; |
fe4ad273 | 1972 | if (data.length != 20) |
1973 | fatal("%s: data length incorrect: %d", __func__, data.length); | |
b59afbfe | 1974 | |
fe4ad273 | 1975 | /* Save the session ID on the first time around */ |
1976 | if (session_id2_len == 0) { | |
1977 | session_id2_len = data.length; | |
1978 | session_id2 = xmalloc(session_id2_len); | |
1979 | memcpy(session_id2, data.value, session_id2_len); | |
1980 | } | |
1981 | major = ssh_gssapi_sign(gsscontext, &data, &hash); | |
b59afbfe | 1982 | |
fe4ad273 | 1983 | xfree(data.value); |
b59afbfe | 1984 | |
fe4ad273 | 1985 | buffer_clear(m); |
1986 | buffer_put_int(m, major); | |
1987 | buffer_put_string(m, hash.value, hash.length); | |
b59afbfe | 1988 | |
fe4ad273 | 1989 | mm_request_send(socket, MONITOR_ANS_GSSSIGN, m); |
b59afbfe | 1990 | |
fe4ad273 | 1991 | gss_release_buffer(&minor, &hash); |
b59afbfe | 1992 | |
fe4ad273 | 1993 | /* Turn on getpwnam permissions */ |
b59afbfe | 1994 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); |
fe4ad273 | 1995 | |
1996 | return (0); | |
b59afbfe | 1997 | } |
1998 | ||
e23e524c | 1999 | int |
2000 | mm_answer_gss_error(int socket, Buffer *m) { | |
2001 | OM_uint32 major,minor; | |
2002 | char *msg; | |
2003 | ||
2004 | msg=ssh_gssapi_last_error(gsscontext,&major,&minor); | |
2005 | buffer_clear(m); | |
2006 | buffer_put_int(m,major); | |
2007 | buffer_put_int(m,minor); | |
2008 | buffer_put_cstring(m,msg); | |
2009 | ||
2010 | mm_request_send(socket,MONITOR_ANS_GSSERR,m); | |
2011 | ||
2012 | xfree(msg); | |
2013 | ||
2014 | return(0); | |
2015 | } | |
2016 | ||
9eeaa28e | 2017 | int |
2018 | mm_answer_gss_indicate_mechs(int socket, Buffer *m) { | |
2019 | OM_uint32 major,minor; | |
2020 | gss_OID_set mech_set; | |
97a8553e | 2021 | size_t i; |
9eeaa28e | 2022 | |
2023 | major=gss_indicate_mechs(&minor, &mech_set); | |
2024 | ||
2025 | buffer_clear(m); | |
2026 | buffer_put_int(m, major); | |
2027 | buffer_put_int(m, mech_set->count); | |
2028 | for (i=0; i < mech_set->count; i++) { | |
2029 | buffer_put_string(m, mech_set->elements[i].elements, | |
2030 | mech_set->elements[i].length); | |
2031 | } | |
2032 | ||
e23e524c | 2033 | #if !defined(MECHGLUE) /* mechglue memory management bug ??? */ |
2034 | gss_release_oid_set(&minor,&mech_set); | |
2035 | #endif | |
2036 | ||
9eeaa28e | 2037 | mm_request_send(socket,MONITOR_ANS_GSSMECHS,m); |
2038 | ||
2039 | return(0); | |
2040 | } | |
2041 | ||
2042 | int | |
e23e524c | 2043 | mm_answer_gss_localname(int socket, Buffer *m) { |
2044 | char *name; | |
9eeaa28e | 2045 | |
e23e524c | 2046 | ssh_gssapi_localname(&name); |
9eeaa28e | 2047 | |
e23e524c | 2048 | buffer_clear(m); |
2049 | if (name) { | |
2050 | buffer_put_cstring(m, name); | |
2051 | debug3("%s: sending result %s", __func__, name); | |
2052 | xfree(name); | |
2053 | } else { | |
2054 | buffer_put_cstring(m, ""); | |
2055 | debug3("%s: sending result \"\"", __func__); | |
2056 | } | |
2057 | ||
2058 | mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m); | |
9eeaa28e | 2059 | |
23987cb8 | 2060 | return(0); |
9eeaa28e | 2061 | } |
fe4ad273 | 2062 | |
b59afbfe | 2063 | #endif /* GSSAPI */ |