]>
Commit | Line | Data |
---|---|---|
5156b1a1 | 1 | /* $OpenBSD: monitor.c,v 1.99 2008/07/10 18:08:11 markus Exp $ */ |
826f3a39 | 2 | /* |
3 | * Copyright 2002 Niels Provos <provos@citi.umich.edu> | |
4 | * Copyright 2002 Markus Friedl <markus@openbsd.org> | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * 1. Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * 2. Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in the | |
14 | * documentation and/or other materials provided with the distribution. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | */ | |
27 | ||
28 | #include "includes.h" | |
826f3a39 | 29 | |
30460aeb | 30 | #include <sys/types.h> |
31 | #include <sys/param.h> | |
32 | #include <sys/socket.h> | |
33 | #include "openbsd-compat/sys-tree.h" | |
34 | #include <sys/wait.h> | |
35 | ||
36 | #include <errno.h> | |
37 | #include <fcntl.h> | |
38 | #ifdef HAVE_PATHS_H | |
39 | #include <paths.h> | |
40 | #endif | |
41 | #include <pwd.h> | |
42 | #include <signal.h> | |
43 | #include <stdarg.h> | |
44 | #include <stdlib.h> | |
45 | #include <string.h> | |
46 | #include <unistd.h> | |
826f3a39 | 47 | |
48 | #ifdef SKEY | |
49 | #include <skey.h> | |
50 | #endif | |
51 | ||
30460aeb | 52 | #include <openssl/dh.h> |
53 | ||
5156b1a1 | 54 | #include "openbsd-compat/sys-queue.h" |
30460aeb | 55 | #include "xmalloc.h" |
826f3a39 | 56 | #include "ssh.h" |
30460aeb | 57 | #include "key.h" |
58 | #include "buffer.h" | |
59 | #include "hostfile.h" | |
826f3a39 | 60 | #include "auth.h" |
30460aeb | 61 | #include "cipher.h" |
826f3a39 | 62 | #include "kex.h" |
63 | #include "dh.h" | |
12a403af | 64 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
65 | #undef TARGET_OS_MAC | |
826f3a39 | 66 | #include "zlib.h" |
12a403af | 67 | #define TARGET_OS_MAC 1 |
68 | #else | |
69 | #include "zlib.h" | |
70 | #endif | |
826f3a39 | 71 | #include "packet.h" |
72 | #include "auth-options.h" | |
73 | #include "sshpty.h" | |
74 | #include "channels.h" | |
75 | #include "session.h" | |
76 | #include "sshlogin.h" | |
77 | #include "canohost.h" | |
78 | #include "log.h" | |
79 | #include "servconf.h" | |
80 | #include "monitor.h" | |
81 | #include "monitor_mm.h" | |
30460aeb | 82 | #ifdef GSSAPI |
83 | #include "ssh-gss.h" | |
84 | #endif | |
826f3a39 | 85 | #include "monitor_wrap.h" |
86 | #include "monitor_fdpass.h" | |
826f3a39 | 87 | #include "misc.h" |
826f3a39 | 88 | #include "compat.h" |
89 | #include "ssh2.h" | |
826f3a39 | 90 | |
b59afbfe | 91 | #ifdef GSSAPI |
b59afbfe | 92 | static Gssctxt *gsscontext = NULL; |
93 | #endif | |
94 | ||
826f3a39 | 95 | /* Imports */ |
96 | extern ServerOptions options; | |
97 | extern u_int utmp_len; | |
98 | extern Newkeys *current_keys[]; | |
99 | extern z_stream incoming_stream; | |
100 | extern z_stream outgoing_stream; | |
101 | extern u_char session_id[]; | |
102 | extern Buffer input, output; | |
103 | extern Buffer auth_debug; | |
104 | extern int auth_debug_init; | |
7e82606e | 105 | extern Buffer loginmsg; |
826f3a39 | 106 | |
107 | /* State exported from the child */ | |
108 | ||
109 | struct { | |
110 | z_stream incoming; | |
111 | z_stream outgoing; | |
112 | u_char *keyin; | |
113 | u_int keyinlen; | |
114 | u_char *keyout; | |
115 | u_int keyoutlen; | |
116 | u_char *ivin; | |
117 | u_int ivinlen; | |
118 | u_char *ivout; | |
119 | u_int ivoutlen; | |
44a053a3 | 120 | u_char *ssh1key; |
121 | u_int ssh1keylen; | |
826f3a39 | 122 | int ssh1cipher; |
123 | int ssh1protoflags; | |
124 | u_char *input; | |
125 | u_int ilen; | |
126 | u_char *output; | |
127 | u_int olen; | |
128 | } child_state; | |
129 | ||
7cac2b65 | 130 | /* Functions on the monitor that answer unprivileged requests */ |
826f3a39 | 131 | |
132 | int mm_answer_moduli(int, Buffer *); | |
133 | int mm_answer_sign(int, Buffer *); | |
134 | int mm_answer_pwnamallow(int, Buffer *); | |
135 | int mm_answer_auth2_read_banner(int, Buffer *); | |
136 | int mm_answer_authserv(int, Buffer *); | |
137 | int mm_answer_authpassword(int, Buffer *); | |
138 | int mm_answer_bsdauthquery(int, Buffer *); | |
139 | int mm_answer_bsdauthrespond(int, Buffer *); | |
140 | int mm_answer_skeyquery(int, Buffer *); | |
141 | int mm_answer_skeyrespond(int, Buffer *); | |
142 | int mm_answer_keyallowed(int, Buffer *); | |
143 | int mm_answer_keyverify(int, Buffer *); | |
144 | int mm_answer_pty(int, Buffer *); | |
145 | int mm_answer_pty_cleanup(int, Buffer *); | |
146 | int mm_answer_term(int, Buffer *); | |
147 | int mm_answer_rsa_keyallowed(int, Buffer *); | |
148 | int mm_answer_rsa_challenge(int, Buffer *); | |
149 | int mm_answer_rsa_response(int, Buffer *); | |
150 | int mm_answer_sesskey(int, Buffer *); | |
151 | int mm_answer_sessid(int, Buffer *); | |
152 | ||
153 | #ifdef USE_PAM | |
154 | int mm_answer_pam_start(int, Buffer *); | |
7cac2b65 | 155 | int mm_answer_pam_account(int, Buffer *); |
156 | int mm_answer_pam_init_ctx(int, Buffer *); | |
157 | int mm_answer_pam_query(int, Buffer *); | |
158 | int mm_answer_pam_respond(int, Buffer *); | |
159 | int mm_answer_pam_free_ctx(int, Buffer *); | |
826f3a39 | 160 | #endif |
161 | ||
7cac2b65 | 162 | #ifdef GSSAPI |
163 | int mm_answer_gss_setup_ctx(int, Buffer *); | |
164 | int mm_answer_gss_accept_ctx(int, Buffer *); | |
165 | int mm_answer_gss_userok(int, Buffer *); | |
540d72c3 | 166 | int mm_answer_gss_checkmic(int, Buffer *); |
b59afbfe | 167 | int mm_answer_gss_sign(int, Buffer *); |
23987cb8 | 168 | int mm_answer_gss_error(int, Buffer *); |
e23e524c | 169 | int mm_answer_gss_indicate_mechs(int, Buffer *); |
170 | int mm_answer_gss_localname(int, Buffer *); | |
b59afbfe | 171 | #endif |
172 | ||
dfddba3d | 173 | #ifdef SSH_AUDIT_EVENTS |
174 | int mm_answer_audit_event(int, Buffer *); | |
175 | int mm_answer_audit_command(int, Buffer *); | |
176 | #endif | |
177 | ||
826f3a39 | 178 | static Authctxt *authctxt; |
179 | static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */ | |
180 | ||
181 | /* local state for key verify */ | |
182 | static u_char *key_blob = NULL; | |
183 | static u_int key_bloblen = 0; | |
184 | static int key_blobtype = MM_NOKEY; | |
d03f4262 | 185 | static char *hostbased_cuser = NULL; |
186 | static char *hostbased_chost = NULL; | |
826f3a39 | 187 | static char *auth_method = "unknown"; |
7cac2b65 | 188 | static u_int session_id2_len = 0; |
44a053a3 | 189 | static u_char *session_id2 = NULL; |
7cac2b65 | 190 | static pid_t monitor_child_pid; |
826f3a39 | 191 | |
192 | struct mon_table { | |
193 | enum monitor_reqtype type; | |
194 | int flags; | |
195 | int (*f)(int, Buffer *); | |
196 | }; | |
197 | ||
198 | #define MON_ISAUTH 0x0004 /* Required for Authentication */ | |
199 | #define MON_AUTHDECIDE 0x0008 /* Decides Authentication */ | |
200 | #define MON_ONCE 0x0010 /* Disable after calling */ | |
30460aeb | 201 | #define MON_ALOG 0x0020 /* Log auth attempt without authenticating */ |
826f3a39 | 202 | |
203 | #define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE) | |
204 | ||
205 | #define MON_PERMIT 0x1000 /* Request is permitted */ | |
206 | ||
207 | struct mon_table mon_dispatch_proto20[] = { | |
208 | {MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli}, | |
209 | {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign}, | |
b59afbfe | 210 | {MONITOR_REQ_PWNAM, MON_AUTH, mm_answer_pwnamallow}, |
826f3a39 | 211 | {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv}, |
212 | {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner}, | |
213 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
214 | #ifdef USE_PAM | |
e2447520 | 215 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 216 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
217 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
218 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
219 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
220 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
826f3a39 | 221 | #endif |
dfddba3d | 222 | #ifdef SSH_AUDIT_EVENTS |
223 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
224 | #endif | |
826f3a39 | 225 | #ifdef BSD_AUTH |
226 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
30460aeb | 227 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
826f3a39 | 228 | #endif |
229 | #ifdef SKEY | |
230 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
231 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
b59afbfe | 232 | #endif |
7cac2b65 | 233 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed}, |
234 | {MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify}, | |
b59afbfe | 235 | #ifdef GSSAPI |
236 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
237 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
7cac2b65 | 238 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, |
fe4ad273 | 239 | {MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic}, |
b59afbfe | 240 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, |
e23e524c | 241 | {MONITOR_REQ_GSSERR, MON_ISAUTH | MON_ONCE, mm_answer_gss_error}, |
9eeaa28e | 242 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
e23e524c | 243 | {MONITOR_REQ_GSSLOCALNAME, MON_ISAUTH, mm_answer_gss_localname}, |
826f3a39 | 244 | #endif |
826f3a39 | 245 | {0, 0, NULL} |
246 | }; | |
247 | ||
248 | struct mon_table mon_dispatch_postauth20[] = { | |
b59afbfe | 249 | #ifdef GSSAPI |
250 | {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx}, | |
251 | {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx}, | |
252 | {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign}, | |
23987cb8 | 253 | {MONITOR_REQ_GSSERR, 0, mm_answer_gss_error}, |
e23e524c | 254 | {MONITOR_REQ_GSSMECHS, 0, mm_answer_gss_indicate_mechs}, |
b59afbfe | 255 | #endif |
826f3a39 | 256 | {MONITOR_REQ_MODULI, 0, mm_answer_moduli}, |
257 | {MONITOR_REQ_SIGN, 0, mm_answer_sign}, | |
258 | {MONITOR_REQ_PTY, 0, mm_answer_pty}, | |
259 | {MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup}, | |
260 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 261 | #ifdef SSH_AUDIT_EVENTS |
262 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
263 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command}, | |
264 | #endif | |
826f3a39 | 265 | {0, 0, NULL} |
266 | }; | |
267 | ||
268 | struct mon_table mon_dispatch_proto15[] = { | |
269 | {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow}, | |
270 | {MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey}, | |
271 | {MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid}, | |
272 | {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword}, | |
30460aeb | 273 | {MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed}, |
274 | {MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed}, | |
826f3a39 | 275 | {MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge}, |
276 | {MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response}, | |
826f3a39 | 277 | #ifdef BSD_AUTH |
278 | {MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery}, | |
30460aeb | 279 | {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond}, |
826f3a39 | 280 | #endif |
281 | #ifdef SKEY | |
282 | {MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery}, | |
283 | {MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond}, | |
284 | #endif | |
b59afbfe | 285 | #ifdef GSSAPI |
286 | {MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx}, | |
287 | {MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx}, | |
288 | {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign}, | |
289 | {MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok}, | |
9eeaa28e | 290 | {MONITOR_REQ_GSSMECHS, MON_ISAUTH, mm_answer_gss_indicate_mechs}, |
b59afbfe | 291 | #endif |
826f3a39 | 292 | #ifdef USE_PAM |
e2447520 | 293 | {MONITOR_REQ_PAM_START, MON_ISAUTH, mm_answer_pam_start}, |
7cac2b65 | 294 | {MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account}, |
295 | {MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx}, | |
296 | {MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query}, | |
297 | {MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond}, | |
298 | {MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx}, | |
dfddba3d | 299 | #endif |
300 | #ifdef SSH_AUDIT_EVENTS | |
301 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
826f3a39 | 302 | #endif |
303 | {0, 0, NULL} | |
304 | }; | |
305 | ||
306 | struct mon_table mon_dispatch_postauth15[] = { | |
307 | {MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty}, | |
308 | {MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup}, | |
309 | {MONITOR_REQ_TERM, 0, mm_answer_term}, | |
dfddba3d | 310 | #ifdef SSH_AUDIT_EVENTS |
311 | {MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event}, | |
30460aeb | 312 | {MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command}, |
dfddba3d | 313 | #endif |
826f3a39 | 314 | {0, 0, NULL} |
315 | }; | |
316 | ||
317 | struct mon_table *mon_dispatch; | |
318 | ||
319 | /* Specifies if a certain message is allowed at the moment */ | |
320 | ||
321 | static void | |
322 | monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit) | |
323 | { | |
324 | while (ent->f != NULL) { | |
325 | if (ent->type == type) { | |
326 | ent->flags &= ~MON_PERMIT; | |
327 | ent->flags |= permit ? MON_PERMIT : 0; | |
328 | return; | |
329 | } | |
330 | ent++; | |
331 | } | |
332 | } | |
333 | ||
334 | static void | |
335 | monitor_permit_authentications(int permit) | |
336 | { | |
337 | struct mon_table *ent = mon_dispatch; | |
338 | ||
339 | while (ent->f != NULL) { | |
340 | if (ent->flags & MON_AUTH) { | |
341 | ent->flags &= ~MON_PERMIT; | |
342 | ent->flags |= permit ? MON_PERMIT : 0; | |
343 | } | |
344 | ent++; | |
345 | } | |
346 | } | |
347 | ||
540d72c3 | 348 | void |
349 | monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor) | |
826f3a39 | 350 | { |
351 | struct mon_table *ent; | |
352 | int authenticated = 0; | |
353 | ||
354 | debug3("preauth child monitor started"); | |
355 | ||
540d72c3 | 356 | authctxt = _authctxt; |
357 | memset(authctxt, 0, sizeof(*authctxt)); | |
358 | ||
8b32eddc | 359 | authctxt->loginmsg = &loginmsg; |
360 | ||
826f3a39 | 361 | if (compat20) { |
362 | mon_dispatch = mon_dispatch_proto20; | |
363 | ||
364 | /* Permit requests for moduli and signatures */ | |
365 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
366 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
b59afbfe | 367 | #ifdef GSSAPI |
368 | /* and for the GSSAPI key exchange */ | |
369 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1); | |
23987cb8 | 370 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
e23e524c | 371 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS, 1); |
b59afbfe | 372 | #endif |
826f3a39 | 373 | } else { |
374 | mon_dispatch = mon_dispatch_proto15; | |
375 | ||
376 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1); | |
377 | } | |
378 | ||
826f3a39 | 379 | /* The first few requests do not require asynchronous access */ |
380 | while (!authenticated) { | |
30460aeb | 381 | auth_method = "unknown"; |
240debe0 | 382 | authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1); |
826f3a39 | 383 | if (authenticated) { |
384 | if (!(ent->flags & MON_AUTHDECIDE)) | |
385 | fatal("%s: unexpected authentication from %d", | |
44a053a3 | 386 | __func__, ent->type); |
826f3a39 | 387 | if (authctxt->pw->pw_uid == 0 && |
388 | !auth_root_allowed(auth_method)) | |
389 | authenticated = 0; | |
390 | #ifdef USE_PAM | |
7cac2b65 | 391 | /* PAM needs to perform account checks after auth */ |
540d72c3 | 392 | if (options.use_pam && authenticated) { |
7cac2b65 | 393 | Buffer m; |
394 | ||
395 | buffer_init(&m); | |
540d72c3 | 396 | mm_request_receive_expect(pmonitor->m_sendfd, |
7cac2b65 | 397 | MONITOR_REQ_PAM_ACCOUNT, &m); |
398 | authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m); | |
399 | buffer_free(&m); | |
400 | } | |
826f3a39 | 401 | #endif |
402 | } | |
403 | ||
30460aeb | 404 | if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) { |
826f3a39 | 405 | auth_log(authctxt, authenticated, auth_method, |
406 | compat20 ? " ssh2" : ""); | |
407 | if (!authenticated) | |
408 | authctxt->failures++; | |
409 | } | |
410 | } | |
411 | ||
412 | if (!authctxt->valid) | |
44a053a3 | 413 | fatal("%s: authenticated invalid user", __func__); |
30460aeb | 414 | if (strcmp(auth_method, "unknown") == 0) |
415 | fatal("%s: authentication method name unknown", __func__); | |
826f3a39 | 416 | |
417 | debug("%s: %s has been authenticated by privileged process", | |
44a053a3 | 418 | __func__, authctxt->user); |
826f3a39 | 419 | |
420 | mm_get_keystate(pmonitor); | |
826f3a39 | 421 | } |
422 | ||
7cac2b65 | 423 | static void |
424 | monitor_set_child_handler(pid_t pid) | |
425 | { | |
426 | monitor_child_pid = pid; | |
427 | } | |
428 | ||
429 | static void | |
7e82606e | 430 | monitor_child_handler(int sig) |
7cac2b65 | 431 | { |
7e82606e | 432 | kill(monitor_child_pid, sig); |
7cac2b65 | 433 | } |
434 | ||
826f3a39 | 435 | void |
436 | monitor_child_postauth(struct monitor *pmonitor) | |
437 | { | |
7cac2b65 | 438 | monitor_set_child_handler(pmonitor->m_pid); |
439 | signal(SIGHUP, &monitor_child_handler); | |
440 | signal(SIGTERM, &monitor_child_handler); | |
fa0f0f45 | 441 | signal(SIGINT, &monitor_child_handler); |
7cac2b65 | 442 | |
826f3a39 | 443 | if (compat20) { |
444 | mon_dispatch = mon_dispatch_postauth20; | |
445 | ||
446 | /* Permit requests for moduli and signatures */ | |
447 | monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1); | |
448 | monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1); | |
449 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
450 | ||
e23e524c | 451 | #ifdef GSSAPI |
452 | /* and for the GSSAPI key exchange */ | |
453 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSMECHS,1); | |
454 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP,1); | |
455 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR,1); | |
456 | #endif | |
457 | ||
826f3a39 | 458 | } else { |
459 | mon_dispatch = mon_dispatch_postauth15; | |
460 | monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1); | |
461 | } | |
9eeaa28e | 462 | #ifdef GSSAPI |
23987cb8 | 463 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSERR, 1); |
9eeaa28e | 464 | #endif |
826f3a39 | 465 | if (!no_pty_flag) { |
466 | monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1); | |
467 | monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1); | |
468 | } | |
469 | ||
470 | for (;;) | |
471 | monitor_read(pmonitor, mon_dispatch, NULL); | |
472 | } | |
473 | ||
474 | void | |
475 | monitor_sync(struct monitor *pmonitor) | |
476 | { | |
44a053a3 | 477 | if (options.compression) { |
478 | /* The member allocation is not visible, so sync it */ | |
479 | mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback); | |
480 | } | |
826f3a39 | 481 | } |
482 | ||
483 | int | |
484 | monitor_read(struct monitor *pmonitor, struct mon_table *ent, | |
485 | struct mon_table **pent) | |
486 | { | |
487 | Buffer m; | |
488 | int ret; | |
489 | u_char type; | |
490 | ||
491 | buffer_init(&m); | |
492 | ||
493 | mm_request_receive(pmonitor->m_sendfd, &m); | |
494 | type = buffer_get_char(&m); | |
495 | ||
44a053a3 | 496 | debug3("%s: checking request %d", __func__, type); |
826f3a39 | 497 | |
498 | while (ent->f != NULL) { | |
499 | if (ent->type == type) | |
500 | break; | |
501 | ent++; | |
502 | } | |
503 | ||
504 | if (ent->f != NULL) { | |
505 | if (!(ent->flags & MON_PERMIT)) | |
44a053a3 | 506 | fatal("%s: unpermitted request %d", __func__, |
826f3a39 | 507 | type); |
508 | ret = (*ent->f)(pmonitor->m_sendfd, &m); | |
509 | buffer_free(&m); | |
510 | ||
511 | /* The child may use this request only once, disable it */ | |
512 | if (ent->flags & MON_ONCE) { | |
44a053a3 | 513 | debug2("%s: %d used once, disabling now", __func__, |
826f3a39 | 514 | type); |
515 | ent->flags &= ~MON_PERMIT; | |
516 | } | |
517 | ||
518 | if (pent != NULL) | |
519 | *pent = ent; | |
520 | ||
521 | return ret; | |
522 | } | |
523 | ||
44a053a3 | 524 | fatal("%s: unsupported request: %d", __func__, type); |
826f3a39 | 525 | |
526 | /* NOTREACHED */ | |
527 | return (-1); | |
528 | } | |
529 | ||
530 | /* allowed key state */ | |
531 | static int | |
532 | monitor_allowed_key(u_char *blob, u_int bloblen) | |
533 | { | |
534 | /* make sure key is allowed */ | |
535 | if (key_blob == NULL || key_bloblen != bloblen || | |
536 | memcmp(key_blob, blob, key_bloblen)) | |
537 | return (0); | |
538 | return (1); | |
539 | } | |
540 | ||
541 | static void | |
542 | monitor_reset_key_state(void) | |
543 | { | |
544 | /* reset state */ | |
545 | if (key_blob != NULL) | |
546 | xfree(key_blob); | |
547 | if (hostbased_cuser != NULL) | |
548 | xfree(hostbased_cuser); | |
549 | if (hostbased_chost != NULL) | |
550 | xfree(hostbased_chost); | |
551 | key_blob = NULL; | |
552 | key_bloblen = 0; | |
553 | key_blobtype = MM_NOKEY; | |
554 | hostbased_cuser = NULL; | |
555 | hostbased_chost = NULL; | |
556 | } | |
557 | ||
558 | int | |
7e82606e | 559 | mm_answer_moduli(int sock, Buffer *m) |
826f3a39 | 560 | { |
561 | DH *dh; | |
562 | int min, want, max; | |
563 | ||
564 | min = buffer_get_int(m); | |
565 | want = buffer_get_int(m); | |
566 | max = buffer_get_int(m); | |
567 | ||
568 | debug3("%s: got parameters: %d %d %d", | |
44a053a3 | 569 | __func__, min, want, max); |
826f3a39 | 570 | /* We need to check here, too, in case the child got corrupted */ |
571 | if (max < min || want < min || max < want) | |
572 | fatal("%s: bad parameters: %d %d %d", | |
44a053a3 | 573 | __func__, min, want, max); |
826f3a39 | 574 | |
575 | buffer_clear(m); | |
576 | ||
577 | dh = choose_dh(min, want, max); | |
578 | if (dh == NULL) { | |
579 | buffer_put_char(m, 0); | |
580 | return (0); | |
581 | } else { | |
582 | /* Send first bignum */ | |
583 | buffer_put_char(m, 1); | |
584 | buffer_put_bignum2(m, dh->p); | |
585 | buffer_put_bignum2(m, dh->g); | |
586 | ||
587 | DH_free(dh); | |
588 | } | |
7e82606e | 589 | mm_request_send(sock, MONITOR_ANS_MODULI, m); |
826f3a39 | 590 | return (0); |
591 | } | |
592 | ||
593 | int | |
7e82606e | 594 | mm_answer_sign(int sock, Buffer *m) |
826f3a39 | 595 | { |
596 | Key *key; | |
597 | u_char *p; | |
598 | u_char *signature; | |
599 | u_int siglen, datlen; | |
600 | int keyid; | |
601 | ||
44a053a3 | 602 | debug3("%s", __func__); |
826f3a39 | 603 | |
604 | keyid = buffer_get_int(m); | |
605 | p = buffer_get_string(m, &datlen); | |
606 | ||
30460aeb | 607 | /* |
608 | * Supported KEX types will only return SHA1 (20 byte) or | |
609 | * SHA256 (32 byte) hashes | |
610 | */ | |
611 | if (datlen != 20 && datlen != 32) | |
d03f4262 | 612 | fatal("%s: data length incorrect: %u", __func__, datlen); |
44a053a3 | 613 | |
614 | /* save session id, it will be passed on the first call */ | |
615 | if (session_id2_len == 0) { | |
616 | session_id2_len = datlen; | |
617 | session_id2 = xmalloc(session_id2_len); | |
618 | memcpy(session_id2, p, session_id2_len); | |
619 | } | |
826f3a39 | 620 | |
621 | if ((key = get_hostkey_by_index(keyid)) == NULL) | |
44a053a3 | 622 | fatal("%s: no hostkey from index %d", __func__, keyid); |
826f3a39 | 623 | if (key_sign(key, &signature, &siglen, p, datlen) < 0) |
44a053a3 | 624 | fatal("%s: key_sign failed", __func__); |
826f3a39 | 625 | |
d03f4262 | 626 | debug3("%s: signature %p(%u)", __func__, signature, siglen); |
826f3a39 | 627 | |
628 | buffer_clear(m); | |
629 | buffer_put_string(m, signature, siglen); | |
630 | ||
631 | xfree(p); | |
632 | xfree(signature); | |
633 | ||
7e82606e | 634 | mm_request_send(sock, MONITOR_ANS_SIGN, m); |
826f3a39 | 635 | |
636 | /* Turn on permissions for getpwnam */ | |
637 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
638 | ||
639 | return (0); | |
640 | } | |
641 | ||
642 | /* Retrieves the password entry and also checks if the user is permitted */ | |
643 | ||
644 | int | |
7e82606e | 645 | mm_answer_pwnamallow(int sock, Buffer *m) |
826f3a39 | 646 | { |
7e82606e | 647 | char *username; |
826f3a39 | 648 | struct passwd *pwent; |
649 | int allowed = 0; | |
650 | ||
44a053a3 | 651 | debug3("%s", __func__); |
826f3a39 | 652 | |
7e82606e | 653 | username = buffer_get_string(m, NULL); |
826f3a39 | 654 | |
7e82606e | 655 | pwent = getpwnamallow(username); |
826f3a39 | 656 | |
b59afbfe | 657 | if (authctxt->user) xfree(authctxt->user); |
7e82606e | 658 | authctxt->user = xstrdup(username); |
659 | setproctitle("%s [priv]", pwent ? username : "unknown"); | |
660 | xfree(username); | |
826f3a39 | 661 | |
662 | buffer_clear(m); | |
663 | ||
664 | if (pwent == NULL) { | |
665 | buffer_put_char(m, 0); | |
540d72c3 | 666 | authctxt->pw = fakepw(); |
826f3a39 | 667 | goto out; |
668 | } | |
669 | ||
670 | allowed = 1; | |
671 | authctxt->pw = pwent; | |
672 | authctxt->valid = 1; | |
673 | ||
674 | buffer_put_char(m, 1); | |
675 | buffer_put_string(m, pwent, sizeof(struct passwd)); | |
676 | buffer_put_cstring(m, pwent->pw_name); | |
677 | buffer_put_cstring(m, "*"); | |
678 | buffer_put_cstring(m, pwent->pw_gecos); | |
679 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
680 | buffer_put_cstring(m, pwent->pw_class); | |
681 | #endif | |
682 | buffer_put_cstring(m, pwent->pw_dir); | |
683 | buffer_put_cstring(m, pwent->pw_shell); | |
e74dc197 | 684 | |
685 | out: | |
0b90ac93 | 686 | buffer_put_string(m, &options, sizeof(options)); |
687 | if (options.banner != NULL) | |
688 | buffer_put_cstring(m, options.banner); | |
44a053a3 | 689 | debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed); |
7e82606e | 690 | mm_request_send(sock, MONITOR_ANS_PWNAM, m); |
826f3a39 | 691 | |
692 | /* For SSHv1 allow authentication now */ | |
693 | if (!compat20) | |
694 | monitor_permit_authentications(1); | |
695 | else { | |
696 | /* Allow service/style information on the auth context */ | |
697 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1); | |
698 | monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1); | |
699 | } | |
700 | ||
701 | #ifdef USE_PAM | |
7cac2b65 | 702 | if (options.use_pam) |
703 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1); | |
826f3a39 | 704 | #endif |
705 | ||
706 | return (0); | |
707 | } | |
708 | ||
7e82606e | 709 | int mm_answer_auth2_read_banner(int sock, Buffer *m) |
826f3a39 | 710 | { |
711 | char *banner; | |
712 | ||
713 | buffer_clear(m); | |
714 | banner = auth2_read_banner(); | |
715 | buffer_put_cstring(m, banner != NULL ? banner : ""); | |
7e82606e | 716 | mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m); |
826f3a39 | 717 | |
718 | if (banner != NULL) | |
d03f4262 | 719 | xfree(banner); |
826f3a39 | 720 | |
721 | return (0); | |
722 | } | |
723 | ||
724 | int | |
7e82606e | 725 | mm_answer_authserv(int sock, Buffer *m) |
826f3a39 | 726 | { |
727 | monitor_permit_authentications(1); | |
728 | ||
729 | authctxt->service = buffer_get_string(m, NULL); | |
730 | authctxt->style = buffer_get_string(m, NULL); | |
731 | debug3("%s: service=%s, style=%s", | |
44a053a3 | 732 | __func__, authctxt->service, authctxt->style); |
826f3a39 | 733 | |
734 | if (strlen(authctxt->style) == 0) { | |
735 | xfree(authctxt->style); | |
736 | authctxt->style = NULL; | |
737 | } | |
738 | ||
739 | return (0); | |
740 | } | |
741 | ||
742 | int | |
7e82606e | 743 | mm_answer_authpassword(int sock, Buffer *m) |
826f3a39 | 744 | { |
745 | static int call_count; | |
746 | char *passwd; | |
d03f4262 | 747 | int authenticated; |
748 | u_int plen; | |
826f3a39 | 749 | |
750 | passwd = buffer_get_string(m, &plen); | |
751 | /* Only authenticate if the context is valid */ | |
44a053a3 | 752 | authenticated = options.password_authentication && |
7cac2b65 | 753 | auth_password(authctxt, passwd); |
826f3a39 | 754 | memset(passwd, 0, strlen(passwd)); |
755 | xfree(passwd); | |
756 | ||
757 | buffer_clear(m); | |
758 | buffer_put_int(m, authenticated); | |
759 | ||
44a053a3 | 760 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 761 | mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m); |
826f3a39 | 762 | |
763 | call_count++; | |
764 | if (plen == 0 && call_count == 1) | |
765 | auth_method = "none"; | |
766 | else | |
767 | auth_method = "password"; | |
768 | ||
769 | /* Causes monitor loop to terminate if authenticated */ | |
770 | return (authenticated); | |
771 | } | |
772 | ||
773 | #ifdef BSD_AUTH | |
774 | int | |
7e82606e | 775 | mm_answer_bsdauthquery(int sock, Buffer *m) |
826f3a39 | 776 | { |
777 | char *name, *infotxt; | |
778 | u_int numprompts; | |
779 | u_int *echo_on; | |
780 | char **prompts; | |
bfe49944 | 781 | u_int success; |
826f3a39 | 782 | |
bfe49944 | 783 | success = bsdauth_query(authctxt, &name, &infotxt, &numprompts, |
784 | &prompts, &echo_on) < 0 ? 0 : 1; | |
826f3a39 | 785 | |
786 | buffer_clear(m); | |
bfe49944 | 787 | buffer_put_int(m, success); |
788 | if (success) | |
826f3a39 | 789 | buffer_put_cstring(m, prompts[0]); |
790 | ||
bfe49944 | 791 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 792 | mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m); |
826f3a39 | 793 | |
bfe49944 | 794 | if (success) { |
826f3a39 | 795 | xfree(name); |
796 | xfree(infotxt); | |
797 | xfree(prompts); | |
798 | xfree(echo_on); | |
799 | } | |
800 | ||
801 | return (0); | |
802 | } | |
803 | ||
804 | int | |
7e82606e | 805 | mm_answer_bsdauthrespond(int sock, Buffer *m) |
826f3a39 | 806 | { |
807 | char *response; | |
808 | int authok; | |
809 | ||
810 | if (authctxt->as == 0) | |
44a053a3 | 811 | fatal("%s: no bsd auth session", __func__); |
826f3a39 | 812 | |
813 | response = buffer_get_string(m, NULL); | |
44a053a3 | 814 | authok = options.challenge_response_authentication && |
815 | auth_userresponse(authctxt->as, response, 0); | |
826f3a39 | 816 | authctxt->as = NULL; |
44a053a3 | 817 | debug3("%s: <%s> = <%d>", __func__, response, authok); |
826f3a39 | 818 | xfree(response); |
819 | ||
820 | buffer_clear(m); | |
821 | buffer_put_int(m, authok); | |
822 | ||
44a053a3 | 823 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 824 | mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m); |
826f3a39 | 825 | |
826 | auth_method = "bsdauth"; | |
827 | ||
828 | return (authok != 0); | |
829 | } | |
830 | #endif | |
831 | ||
832 | #ifdef SKEY | |
833 | int | |
7e82606e | 834 | mm_answer_skeyquery(int sock, Buffer *m) |
826f3a39 | 835 | { |
836 | struct skey skey; | |
837 | char challenge[1024]; | |
bfe49944 | 838 | u_int success; |
826f3a39 | 839 | |
12a403af | 840 | success = _compat_skeychallenge(&skey, authctxt->user, challenge, |
841 | sizeof(challenge)) < 0 ? 0 : 1; | |
826f3a39 | 842 | |
843 | buffer_clear(m); | |
bfe49944 | 844 | buffer_put_int(m, success); |
845 | if (success) | |
826f3a39 | 846 | buffer_put_cstring(m, challenge); |
847 | ||
bfe49944 | 848 | debug3("%s: sending challenge success: %u", __func__, success); |
7e82606e | 849 | mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m); |
826f3a39 | 850 | |
851 | return (0); | |
852 | } | |
853 | ||
854 | int | |
7e82606e | 855 | mm_answer_skeyrespond(int sock, Buffer *m) |
826f3a39 | 856 | { |
857 | char *response; | |
858 | int authok; | |
859 | ||
860 | response = buffer_get_string(m, NULL); | |
861 | ||
44a053a3 | 862 | authok = (options.challenge_response_authentication && |
863 | authctxt->valid && | |
826f3a39 | 864 | skey_haskey(authctxt->pw->pw_name) == 0 && |
865 | skey_passcheck(authctxt->pw->pw_name, response) != -1); | |
866 | ||
867 | xfree(response); | |
868 | ||
869 | buffer_clear(m); | |
870 | buffer_put_int(m, authok); | |
871 | ||
44a053a3 | 872 | debug3("%s: sending authenticated: %d", __func__, authok); |
7e82606e | 873 | mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m); |
826f3a39 | 874 | |
875 | auth_method = "skey"; | |
876 | ||
877 | return (authok != 0); | |
878 | } | |
879 | #endif | |
880 | ||
881 | #ifdef USE_PAM | |
882 | int | |
7e82606e | 883 | mm_answer_pam_start(int sock, Buffer *m) |
826f3a39 | 884 | { |
7cac2b65 | 885 | if (!options.use_pam) |
886 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
887 | ||
12a403af | 888 | start_pam(authctxt); |
826f3a39 | 889 | |
7cac2b65 | 890 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1); |
891 | ||
826f3a39 | 892 | return (0); |
893 | } | |
7cac2b65 | 894 | |
895 | int | |
7e82606e | 896 | mm_answer_pam_account(int sock, Buffer *m) |
7cac2b65 | 897 | { |
898 | u_int ret; | |
540d72c3 | 899 | |
7cac2b65 | 900 | if (!options.use_pam) |
901 | fatal("UsePAM not set, but ended up in %s anyway", __func__); | |
902 | ||
903 | ret = do_pam_account(); | |
904 | ||
905 | buffer_put_int(m, ret); | |
08822d99 | 906 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); |
7cac2b65 | 907 | |
7e82606e | 908 | mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m); |
7cac2b65 | 909 | |
910 | return (ret); | |
911 | } | |
912 | ||
913 | static void *sshpam_ctxt, *sshpam_authok; | |
914 | extern KbdintDevice sshpam_device; | |
915 | ||
916 | int | |
7e82606e | 917 | mm_answer_pam_init_ctx(int sock, Buffer *m) |
7cac2b65 | 918 | { |
919 | ||
920 | debug3("%s", __func__); | |
921 | authctxt->user = buffer_get_string(m, NULL); | |
922 | sshpam_ctxt = (sshpam_device.init_ctx)(authctxt); | |
923 | sshpam_authok = NULL; | |
924 | buffer_clear(m); | |
925 | if (sshpam_ctxt != NULL) { | |
926 | monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1); | |
927 | buffer_put_int(m, 1); | |
928 | } else { | |
929 | buffer_put_int(m, 0); | |
930 | } | |
7e82606e | 931 | mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m); |
7cac2b65 | 932 | return (0); |
933 | } | |
934 | ||
935 | int | |
7e82606e | 936 | mm_answer_pam_query(int sock, Buffer *m) |
7cac2b65 | 937 | { |
938 | char *name, *info, **prompts; | |
2ce0bfe4 | 939 | u_int i, num, *echo_on; |
940 | int ret; | |
7cac2b65 | 941 | |
942 | debug3("%s", __func__); | |
943 | sshpam_authok = NULL; | |
944 | ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on); | |
945 | if (ret == 0 && num == 0) | |
946 | sshpam_authok = sshpam_ctxt; | |
947 | if (num > 1 || name == NULL || info == NULL) | |
948 | ret = -1; | |
949 | buffer_clear(m); | |
950 | buffer_put_int(m, ret); | |
951 | buffer_put_cstring(m, name); | |
952 | xfree(name); | |
953 | buffer_put_cstring(m, info); | |
954 | xfree(info); | |
955 | buffer_put_int(m, num); | |
956 | for (i = 0; i < num; ++i) { | |
957 | buffer_put_cstring(m, prompts[i]); | |
958 | xfree(prompts[i]); | |
959 | buffer_put_int(m, echo_on[i]); | |
960 | } | |
961 | if (prompts != NULL) | |
962 | xfree(prompts); | |
963 | if (echo_on != NULL) | |
964 | xfree(echo_on); | |
30460aeb | 965 | auth_method = "keyboard-interactive/pam"; |
7e82606e | 966 | mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m); |
7cac2b65 | 967 | return (0); |
968 | } | |
969 | ||
970 | int | |
7e82606e | 971 | mm_answer_pam_respond(int sock, Buffer *m) |
7cac2b65 | 972 | { |
973 | char **resp; | |
2ce0bfe4 | 974 | u_int i, num; |
975 | int ret; | |
7cac2b65 | 976 | |
977 | debug3("%s", __func__); | |
978 | sshpam_authok = NULL; | |
979 | num = buffer_get_int(m); | |
980 | if (num > 0) { | |
30460aeb | 981 | resp = xcalloc(num, sizeof(char *)); |
7cac2b65 | 982 | for (i = 0; i < num; ++i) |
983 | resp[i] = buffer_get_string(m, NULL); | |
984 | ret = (sshpam_device.respond)(sshpam_ctxt, num, resp); | |
985 | for (i = 0; i < num; ++i) | |
986 | xfree(resp[i]); | |
987 | xfree(resp); | |
988 | } else { | |
989 | ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL); | |
990 | } | |
991 | buffer_clear(m); | |
992 | buffer_put_int(m, ret); | |
7e82606e | 993 | mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m); |
7cac2b65 | 994 | auth_method = "keyboard-interactive/pam"; |
995 | if (ret == 0) | |
996 | sshpam_authok = sshpam_ctxt; | |
997 | return (0); | |
998 | } | |
999 | ||
1000 | int | |
7e82606e | 1001 | mm_answer_pam_free_ctx(int sock, Buffer *m) |
7cac2b65 | 1002 | { |
1003 | ||
1004 | debug3("%s", __func__); | |
1005 | (sshpam_device.free_ctx)(sshpam_ctxt); | |
1006 | buffer_clear(m); | |
7e82606e | 1007 | mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m); |
30460aeb | 1008 | auth_method = "keyboard-interactive/pam"; |
7cac2b65 | 1009 | return (sshpam_authok == sshpam_ctxt); |
1010 | } | |
826f3a39 | 1011 | #endif |
1012 | ||
1013 | static void | |
1014 | mm_append_debug(Buffer *m) | |
1015 | { | |
1016 | if (auth_debug_init && buffer_len(&auth_debug)) { | |
44a053a3 | 1017 | debug3("%s: Appending debug messages for child", __func__); |
826f3a39 | 1018 | buffer_append(m, buffer_ptr(&auth_debug), |
1019 | buffer_len(&auth_debug)); | |
1020 | buffer_clear(&auth_debug); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | int | |
7e82606e | 1025 | mm_answer_keyallowed(int sock, Buffer *m) |
826f3a39 | 1026 | { |
1027 | Key *key; | |
d03f4262 | 1028 | char *cuser, *chost; |
1029 | u_char *blob; | |
826f3a39 | 1030 | u_int bloblen; |
1031 | enum mm_keytype type = 0; | |
1032 | int allowed = 0; | |
1033 | ||
44a053a3 | 1034 | debug3("%s entering", __func__); |
826f3a39 | 1035 | |
1036 | type = buffer_get_int(m); | |
1037 | cuser = buffer_get_string(m, NULL); | |
1038 | chost = buffer_get_string(m, NULL); | |
1039 | blob = buffer_get_string(m, &bloblen); | |
1040 | ||
1041 | key = key_from_blob(blob, bloblen); | |
1042 | ||
1043 | if ((compat20 && type == MM_RSAHOSTKEY) || | |
1044 | (!compat20 && type != MM_RSAHOSTKEY)) | |
44a053a3 | 1045 | fatal("%s: key type and protocol mismatch", __func__); |
826f3a39 | 1046 | |
44a053a3 | 1047 | debug3("%s: key_from_blob: %p", __func__, key); |
826f3a39 | 1048 | |
540d72c3 | 1049 | if (key != NULL && authctxt->valid) { |
8b32eddc | 1050 | switch (type) { |
826f3a39 | 1051 | case MM_USERKEY: |
44a053a3 | 1052 | allowed = options.pubkey_authentication && |
1053 | user_key_allowed(authctxt->pw, key); | |
30460aeb | 1054 | auth_method = "publickey"; |
5156b1a1 | 1055 | if (options.pubkey_authentication && allowed != 1) |
1056 | auth_clear_options(); | |
826f3a39 | 1057 | break; |
1058 | case MM_HOSTKEY: | |
44a053a3 | 1059 | allowed = options.hostbased_authentication && |
1060 | hostbased_key_allowed(authctxt->pw, | |
826f3a39 | 1061 | cuser, chost, key); |
30460aeb | 1062 | auth_method = "hostbased"; |
826f3a39 | 1063 | break; |
1064 | case MM_RSAHOSTKEY: | |
1065 | key->type = KEY_RSA1; /* XXX */ | |
44a053a3 | 1066 | allowed = options.rhosts_rsa_authentication && |
1067 | auth_rhosts_rsa_key_allowed(authctxt->pw, | |
826f3a39 | 1068 | cuser, chost, key); |
5156b1a1 | 1069 | if (options.rhosts_rsa_authentication && allowed != 1) |
1070 | auth_clear_options(); | |
30460aeb | 1071 | auth_method = "rsa"; |
826f3a39 | 1072 | break; |
1073 | default: | |
44a053a3 | 1074 | fatal("%s: unknown key type %d", __func__, type); |
826f3a39 | 1075 | break; |
1076 | } | |
826f3a39 | 1077 | } |
bfe49944 | 1078 | if (key != NULL) |
1079 | key_free(key); | |
826f3a39 | 1080 | |
1081 | /* clear temporarily storage (used by verify) */ | |
1082 | monitor_reset_key_state(); | |
1083 | ||
1084 | if (allowed) { | |
1085 | /* Save temporarily for comparison in verify */ | |
1086 | key_blob = blob; | |
1087 | key_bloblen = bloblen; | |
1088 | key_blobtype = type; | |
1089 | hostbased_cuser = cuser; | |
1090 | hostbased_chost = chost; | |
30460aeb | 1091 | } else { |
1092 | /* Log failed attempt */ | |
1093 | auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : ""); | |
1094 | xfree(blob); | |
1095 | xfree(cuser); | |
1096 | xfree(chost); | |
826f3a39 | 1097 | } |
1098 | ||
1099 | debug3("%s: key %p is %s", | |
5156b1a1 | 1100 | __func__, key, allowed ? "allowed" : "not allowed"); |
826f3a39 | 1101 | |
1102 | buffer_clear(m); | |
1103 | buffer_put_int(m, allowed); | |
bfe49944 | 1104 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1105 | |
1106 | mm_append_debug(m); | |
1107 | ||
7e82606e | 1108 | mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m); |
826f3a39 | 1109 | |
1110 | if (type == MM_RSAHOSTKEY) | |
1111 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1112 | ||
1113 | return (0); | |
1114 | } | |
1115 | ||
1116 | static int | |
1117 | monitor_valid_userblob(u_char *data, u_int datalen) | |
1118 | { | |
1119 | Buffer b; | |
d03f4262 | 1120 | char *p; |
826f3a39 | 1121 | u_int len; |
1122 | int fail = 0; | |
826f3a39 | 1123 | |
1124 | buffer_init(&b); | |
1125 | buffer_append(&b, data, datalen); | |
1126 | ||
1127 | if (datafellows & SSH_OLD_SESSIONID) { | |
44a053a3 | 1128 | p = buffer_ptr(&b); |
1129 | len = buffer_len(&b); | |
1130 | if ((session_id2 == NULL) || | |
1131 | (len < session_id2_len) || | |
1132 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
1133 | fail++; | |
826f3a39 | 1134 | buffer_consume(&b, session_id2_len); |
1135 | } else { | |
44a053a3 | 1136 | p = buffer_get_string(&b, &len); |
1137 | if ((session_id2 == NULL) || | |
1138 | (len != session_id2_len) || | |
1139 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1140 | fail++; |
44a053a3 | 1141 | xfree(p); |
826f3a39 | 1142 | } |
1143 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) | |
1144 | fail++; | |
1145 | p = buffer_get_string(&b, NULL); | |
1146 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1147 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1148 | authctxt->user, p); |
1149 | fail++; | |
1150 | } | |
1151 | xfree(p); | |
1152 | buffer_skip_string(&b); | |
1153 | if (datafellows & SSH_BUG_PKAUTH) { | |
1154 | if (!buffer_get_char(&b)) | |
1155 | fail++; | |
1156 | } else { | |
1157 | p = buffer_get_string(&b, NULL); | |
1158 | if (strcmp("publickey", p) != 0) | |
1159 | fail++; | |
1160 | xfree(p); | |
1161 | if (!buffer_get_char(&b)) | |
1162 | fail++; | |
1163 | buffer_skip_string(&b); | |
1164 | } | |
1165 | buffer_skip_string(&b); | |
1166 | if (buffer_len(&b) != 0) | |
1167 | fail++; | |
1168 | buffer_free(&b); | |
1169 | return (fail == 0); | |
1170 | } | |
1171 | ||
1172 | static int | |
d03f4262 | 1173 | monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser, |
1174 | char *chost) | |
826f3a39 | 1175 | { |
1176 | Buffer b; | |
d03f4262 | 1177 | char *p; |
826f3a39 | 1178 | u_int len; |
1179 | int fail = 0; | |
826f3a39 | 1180 | |
1181 | buffer_init(&b); | |
1182 | buffer_append(&b, data, datalen); | |
1183 | ||
44a053a3 | 1184 | p = buffer_get_string(&b, &len); |
1185 | if ((session_id2 == NULL) || | |
1186 | (len != session_id2_len) || | |
1187 | (memcmp(p, session_id2, session_id2_len) != 0)) | |
826f3a39 | 1188 | fail++; |
44a053a3 | 1189 | xfree(p); |
1190 | ||
826f3a39 | 1191 | if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST) |
1192 | fail++; | |
1193 | p = buffer_get_string(&b, NULL); | |
1194 | if (strcmp(authctxt->user, p) != 0) { | |
7cac2b65 | 1195 | logit("wrong user name passed to monitor: expected %s != %.100s", |
826f3a39 | 1196 | authctxt->user, p); |
1197 | fail++; | |
1198 | } | |
1199 | xfree(p); | |
1200 | buffer_skip_string(&b); /* service */ | |
1201 | p = buffer_get_string(&b, NULL); | |
1202 | if (strcmp(p, "hostbased") != 0) | |
1203 | fail++; | |
1204 | xfree(p); | |
1205 | buffer_skip_string(&b); /* pkalg */ | |
1206 | buffer_skip_string(&b); /* pkblob */ | |
1207 | ||
1208 | /* verify client host, strip trailing dot if necessary */ | |
1209 | p = buffer_get_string(&b, NULL); | |
1210 | if (((len = strlen(p)) > 0) && p[len - 1] == '.') | |
1211 | p[len - 1] = '\0'; | |
1212 | if (strcmp(p, chost) != 0) | |
1213 | fail++; | |
1214 | xfree(p); | |
1215 | ||
1216 | /* verify client user */ | |
1217 | p = buffer_get_string(&b, NULL); | |
1218 | if (strcmp(p, cuser) != 0) | |
1219 | fail++; | |
1220 | xfree(p); | |
1221 | ||
1222 | if (buffer_len(&b) != 0) | |
1223 | fail++; | |
1224 | buffer_free(&b); | |
1225 | return (fail == 0); | |
1226 | } | |
1227 | ||
1228 | int | |
7e82606e | 1229 | mm_answer_keyverify(int sock, Buffer *m) |
826f3a39 | 1230 | { |
1231 | Key *key; | |
1232 | u_char *signature, *data, *blob; | |
1233 | u_int signaturelen, datalen, bloblen; | |
1234 | int verified = 0; | |
1235 | int valid_data = 0; | |
1236 | ||
1237 | blob = buffer_get_string(m, &bloblen); | |
1238 | signature = buffer_get_string(m, &signaturelen); | |
1239 | data = buffer_get_string(m, &datalen); | |
1240 | ||
1241 | if (hostbased_cuser == NULL || hostbased_chost == NULL || | |
1242 | !monitor_allowed_key(blob, bloblen)) | |
44a053a3 | 1243 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1244 | |
1245 | key = key_from_blob(blob, bloblen); | |
1246 | if (key == NULL) | |
44a053a3 | 1247 | fatal("%s: bad public key blob", __func__); |
826f3a39 | 1248 | |
1249 | switch (key_blobtype) { | |
1250 | case MM_USERKEY: | |
1251 | valid_data = monitor_valid_userblob(data, datalen); | |
1252 | break; | |
1253 | case MM_HOSTKEY: | |
1254 | valid_data = monitor_valid_hostbasedblob(data, datalen, | |
1255 | hostbased_cuser, hostbased_chost); | |
1256 | break; | |
1257 | default: | |
1258 | valid_data = 0; | |
1259 | break; | |
1260 | } | |
1261 | if (!valid_data) | |
44a053a3 | 1262 | fatal("%s: bad signature data blob", __func__); |
826f3a39 | 1263 | |
1264 | verified = key_verify(key, signature, signaturelen, data, datalen); | |
1265 | debug3("%s: key %p signature %s", | |
240debe0 | 1266 | __func__, key, (verified == 1) ? "verified" : "unverified"); |
826f3a39 | 1267 | |
1268 | key_free(key); | |
1269 | xfree(blob); | |
1270 | xfree(signature); | |
1271 | xfree(data); | |
1272 | ||
276b07a3 | 1273 | auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased"; |
1274 | ||
826f3a39 | 1275 | monitor_reset_key_state(); |
1276 | ||
1277 | buffer_clear(m); | |
1278 | buffer_put_int(m, verified); | |
7e82606e | 1279 | mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m); |
826f3a39 | 1280 | |
240debe0 | 1281 | return (verified == 1); |
826f3a39 | 1282 | } |
1283 | ||
1284 | static void | |
1285 | mm_record_login(Session *s, struct passwd *pw) | |
1286 | { | |
1287 | socklen_t fromlen; | |
1288 | struct sockaddr_storage from; | |
1289 | ||
1290 | /* | |
1291 | * Get IP address of client. If the connection is not a socket, let | |
1292 | * the address be 0.0.0.0. | |
1293 | */ | |
1294 | memset(&from, 0, sizeof(from)); | |
d03f4262 | 1295 | fromlen = sizeof(from); |
826f3a39 | 1296 | if (packet_connection_is_on_socket()) { |
826f3a39 | 1297 | if (getpeername(packet_get_connection_in(), |
30460aeb | 1298 | (struct sockaddr *)&from, &fromlen) < 0) { |
826f3a39 | 1299 | debug("getpeername: %.100s", strerror(errno)); |
540d72c3 | 1300 | cleanup_exit(255); |
826f3a39 | 1301 | } |
1302 | } | |
1303 | /* Record that there was a login on that tty from the remote host. */ | |
1304 | record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid, | |
7cac2b65 | 1305 | get_remote_name_or_ip(utmp_len, options.use_dns), |
d03f4262 | 1306 | (struct sockaddr *)&from, fromlen); |
826f3a39 | 1307 | } |
1308 | ||
1309 | static void | |
1310 | mm_session_close(Session *s) | |
1311 | { | |
7cac2b65 | 1312 | debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid); |
826f3a39 | 1313 | if (s->ttyfd != -1) { |
30460aeb | 1314 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd); |
826f3a39 | 1315 | session_pty_cleanup2(s); |
1316 | } | |
5156b1a1 | 1317 | session_unused(s->self); |
826f3a39 | 1318 | } |
1319 | ||
1320 | int | |
7e82606e | 1321 | mm_answer_pty(int sock, Buffer *m) |
826f3a39 | 1322 | { |
1323 | extern struct monitor *pmonitor; | |
1324 | Session *s; | |
1325 | int res, fd0; | |
1326 | ||
44a053a3 | 1327 | debug3("%s entering", __func__); |
826f3a39 | 1328 | |
1329 | buffer_clear(m); | |
1330 | s = session_new(); | |
1331 | if (s == NULL) | |
1332 | goto error; | |
1333 | s->authctxt = authctxt; | |
1334 | s->pw = authctxt->pw; | |
1335 | s->pid = pmonitor->m_pid; | |
1336 | res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)); | |
1337 | if (res == 0) | |
1338 | goto error; | |
826f3a39 | 1339 | pty_setowner(authctxt->pw, s->tty); |
1340 | ||
1341 | buffer_put_int(m, 1); | |
1342 | buffer_put_cstring(m, s->tty); | |
826f3a39 | 1343 | |
1344 | /* We need to trick ttyslot */ | |
1345 | if (dup2(s->ttyfd, 0) == -1) | |
44a053a3 | 1346 | fatal("%s: dup2", __func__); |
826f3a39 | 1347 | |
1348 | mm_record_login(s, authctxt->pw); | |
1349 | ||
1350 | /* Now we can close the file descriptor again */ | |
1351 | close(0); | |
1352 | ||
7e82606e | 1353 | /* send messages generated by record_login */ |
1354 | buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg)); | |
1355 | buffer_clear(&loginmsg); | |
1356 | ||
1357 | mm_request_send(sock, MONITOR_ANS_PTY, m); | |
1358 | ||
e74dc197 | 1359 | if (mm_send_fd(sock, s->ptyfd) == -1 || |
1360 | mm_send_fd(sock, s->ttyfd) == -1) | |
1361 | fatal("%s: send fds failed", __func__); | |
7e82606e | 1362 | |
826f3a39 | 1363 | /* make sure nothing uses fd 0 */ |
1364 | if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0) | |
44a053a3 | 1365 | fatal("%s: open(/dev/null): %s", __func__, strerror(errno)); |
826f3a39 | 1366 | if (fd0 != 0) |
44a053a3 | 1367 | error("%s: fd0 %d != 0", __func__, fd0); |
826f3a39 | 1368 | |
1369 | /* slave is not needed */ | |
1370 | close(s->ttyfd); | |
1371 | s->ttyfd = s->ptyfd; | |
1372 | /* no need to dup() because nobody closes ptyfd */ | |
1373 | s->ptymaster = s->ptyfd; | |
1374 | ||
30460aeb | 1375 | debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd); |
826f3a39 | 1376 | |
1377 | return (0); | |
1378 | ||
1379 | error: | |
1380 | if (s != NULL) | |
1381 | mm_session_close(s); | |
1382 | buffer_put_int(m, 0); | |
7e82606e | 1383 | mm_request_send(sock, MONITOR_ANS_PTY, m); |
826f3a39 | 1384 | return (0); |
1385 | } | |
1386 | ||
1387 | int | |
7e82606e | 1388 | mm_answer_pty_cleanup(int sock, Buffer *m) |
826f3a39 | 1389 | { |
1390 | Session *s; | |
1391 | char *tty; | |
1392 | ||
44a053a3 | 1393 | debug3("%s entering", __func__); |
826f3a39 | 1394 | |
1395 | tty = buffer_get_string(m, NULL); | |
1396 | if ((s = session_by_tty(tty)) != NULL) | |
1397 | mm_session_close(s); | |
1398 | buffer_clear(m); | |
1399 | xfree(tty); | |
1400 | return (0); | |
1401 | } | |
1402 | ||
1403 | int | |
7e82606e | 1404 | mm_answer_sesskey(int sock, Buffer *m) |
826f3a39 | 1405 | { |
1406 | BIGNUM *p; | |
1407 | int rsafail; | |
1408 | ||
1409 | /* Turn off permissions */ | |
dfddba3d | 1410 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0); |
826f3a39 | 1411 | |
1412 | if ((p = BN_new()) == NULL) | |
44a053a3 | 1413 | fatal("%s: BN_new", __func__); |
826f3a39 | 1414 | |
1415 | buffer_get_bignum2(m, p); | |
1416 | ||
1417 | rsafail = ssh1_session_key(p); | |
1418 | ||
1419 | buffer_clear(m); | |
1420 | buffer_put_int(m, rsafail); | |
1421 | buffer_put_bignum2(m, p); | |
1422 | ||
1423 | BN_clear_free(p); | |
1424 | ||
7e82606e | 1425 | mm_request_send(sock, MONITOR_ANS_SESSKEY, m); |
826f3a39 | 1426 | |
1427 | /* Turn on permissions for sessid passing */ | |
1428 | monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1); | |
1429 | ||
1430 | return (0); | |
1431 | } | |
1432 | ||
1433 | int | |
7e82606e | 1434 | mm_answer_sessid(int sock, Buffer *m) |
826f3a39 | 1435 | { |
1436 | int i; | |
1437 | ||
44a053a3 | 1438 | debug3("%s entering", __func__); |
826f3a39 | 1439 | |
1440 | if (buffer_len(m) != 16) | |
44a053a3 | 1441 | fatal("%s: bad ssh1 session id", __func__); |
826f3a39 | 1442 | for (i = 0; i < 16; i++) |
1443 | session_id[i] = buffer_get_char(m); | |
1444 | ||
1445 | /* Turn on permissions for getpwnam */ | |
1446 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); | |
1447 | ||
1448 | return (0); | |
1449 | } | |
1450 | ||
1451 | int | |
7e82606e | 1452 | mm_answer_rsa_keyallowed(int sock, Buffer *m) |
826f3a39 | 1453 | { |
1454 | BIGNUM *client_n; | |
1455 | Key *key = NULL; | |
1456 | u_char *blob = NULL; | |
1457 | u_int blen = 0; | |
1458 | int allowed = 0; | |
1459 | ||
44a053a3 | 1460 | debug3("%s entering", __func__); |
826f3a39 | 1461 | |
30460aeb | 1462 | auth_method = "rsa"; |
44a053a3 | 1463 | if (options.rsa_authentication && authctxt->valid) { |
826f3a39 | 1464 | if ((client_n = BN_new()) == NULL) |
44a053a3 | 1465 | fatal("%s: BN_new", __func__); |
826f3a39 | 1466 | buffer_get_bignum2(m, client_n); |
1467 | allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key); | |
1468 | BN_clear_free(client_n); | |
1469 | } | |
1470 | buffer_clear(m); | |
1471 | buffer_put_int(m, allowed); | |
bfe49944 | 1472 | buffer_put_int(m, forced_command != NULL); |
826f3a39 | 1473 | |
1474 | /* clear temporarily storage (used by generate challenge) */ | |
1475 | monitor_reset_key_state(); | |
1476 | ||
1477 | if (allowed && key != NULL) { | |
1478 | key->type = KEY_RSA; /* cheat for key_to_blob */ | |
1479 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 1480 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 1481 | buffer_put_string(m, blob, blen); |
1482 | ||
1483 | /* Save temporarily for comparison in verify */ | |
1484 | key_blob = blob; | |
1485 | key_bloblen = blen; | |
1486 | key_blobtype = MM_RSAUSERKEY; | |
826f3a39 | 1487 | } |
bfe49944 | 1488 | if (key != NULL) |
1489 | key_free(key); | |
826f3a39 | 1490 | |
1491 | mm_append_debug(m); | |
1492 | ||
7e82606e | 1493 | mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m); |
826f3a39 | 1494 | |
1495 | monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed); | |
1496 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0); | |
1497 | return (0); | |
1498 | } | |
1499 | ||
1500 | int | |
7e82606e | 1501 | mm_answer_rsa_challenge(int sock, Buffer *m) |
826f3a39 | 1502 | { |
1503 | Key *key = NULL; | |
1504 | u_char *blob; | |
1505 | u_int blen; | |
1506 | ||
44a053a3 | 1507 | debug3("%s entering", __func__); |
826f3a39 | 1508 | |
1509 | if (!authctxt->valid) | |
44a053a3 | 1510 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1511 | blob = buffer_get_string(m, &blen); |
1512 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1513 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1514 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1515 | fatal("%s: key type mismatch", __func__); |
826f3a39 | 1516 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1517 | fatal("%s: received bad key", __func__); |
826f3a39 | 1518 | |
1519 | if (ssh1_challenge) | |
1520 | BN_clear_free(ssh1_challenge); | |
1521 | ssh1_challenge = auth_rsa_generate_challenge(key); | |
1522 | ||
1523 | buffer_clear(m); | |
1524 | buffer_put_bignum2(m, ssh1_challenge); | |
1525 | ||
44a053a3 | 1526 | debug3("%s sending reply", __func__); |
7e82606e | 1527 | mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m); |
826f3a39 | 1528 | |
1529 | monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1); | |
bfe49944 | 1530 | |
1531 | xfree(blob); | |
1532 | key_free(key); | |
826f3a39 | 1533 | return (0); |
1534 | } | |
1535 | ||
1536 | int | |
7e82606e | 1537 | mm_answer_rsa_response(int sock, Buffer *m) |
826f3a39 | 1538 | { |
1539 | Key *key = NULL; | |
1540 | u_char *blob, *response; | |
1541 | u_int blen, len; | |
1542 | int success; | |
1543 | ||
44a053a3 | 1544 | debug3("%s entering", __func__); |
826f3a39 | 1545 | |
1546 | if (!authctxt->valid) | |
44a053a3 | 1547 | fatal("%s: authctxt not valid", __func__); |
826f3a39 | 1548 | if (ssh1_challenge == NULL) |
44a053a3 | 1549 | fatal("%s: no ssh1_challenge", __func__); |
826f3a39 | 1550 | |
1551 | blob = buffer_get_string(m, &blen); | |
1552 | if (!monitor_allowed_key(blob, blen)) | |
44a053a3 | 1553 | fatal("%s: bad key, not previously allowed", __func__); |
826f3a39 | 1554 | if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY) |
44a053a3 | 1555 | fatal("%s: key type mismatch: %d", __func__, key_blobtype); |
826f3a39 | 1556 | if ((key = key_from_blob(blob, blen)) == NULL) |
44a053a3 | 1557 | fatal("%s: received bad key", __func__); |
826f3a39 | 1558 | response = buffer_get_string(m, &len); |
1559 | if (len != 16) | |
44a053a3 | 1560 | fatal("%s: received bad response to challenge", __func__); |
826f3a39 | 1561 | success = auth_rsa_verify_response(key, ssh1_challenge, response); |
1562 | ||
bfe49944 | 1563 | xfree(blob); |
826f3a39 | 1564 | key_free(key); |
1565 | xfree(response); | |
1566 | ||
1567 | auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa"; | |
1568 | ||
1569 | /* reset state */ | |
1570 | BN_clear_free(ssh1_challenge); | |
1571 | ssh1_challenge = NULL; | |
1572 | monitor_reset_key_state(); | |
1573 | ||
1574 | buffer_clear(m); | |
1575 | buffer_put_int(m, success); | |
7e82606e | 1576 | mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m); |
826f3a39 | 1577 | |
1578 | return (success); | |
1579 | } | |
1580 | ||
1581 | int | |
7e82606e | 1582 | mm_answer_term(int sock, Buffer *req) |
826f3a39 | 1583 | { |
1584 | extern struct monitor *pmonitor; | |
1585 | int res, status; | |
1586 | ||
44a053a3 | 1587 | debug3("%s: tearing down sessions", __func__); |
826f3a39 | 1588 | |
1589 | /* The child is terminating */ | |
1590 | session_destroy_all(&mm_session_close); | |
1591 | ||
e74dc197 | 1592 | #ifdef USE_PAM |
1593 | if (options.use_pam) | |
1594 | sshpam_cleanup(); | |
1595 | #endif | |
1596 | ||
826f3a39 | 1597 | while (waitpid(pmonitor->m_pid, &status, 0) == -1) |
1598 | if (errno != EINTR) | |
1599 | exit(1); | |
1600 | ||
1601 | res = WIFEXITED(status) ? WEXITSTATUS(status) : 1; | |
1602 | ||
1603 | /* Terminate process */ | |
7e82606e | 1604 | exit(res); |
826f3a39 | 1605 | } |
1606 | ||
dfddba3d | 1607 | #ifdef SSH_AUDIT_EVENTS |
1608 | /* Report that an audit event occurred */ | |
1609 | int | |
1610 | mm_answer_audit_event(int socket, Buffer *m) | |
1611 | { | |
1612 | ssh_audit_event_t event; | |
1613 | ||
1614 | debug3("%s entering", __func__); | |
1615 | ||
1616 | event = buffer_get_int(m); | |
dfddba3d | 1617 | switch(event) { |
1618 | case SSH_AUTH_FAIL_PUBKEY: | |
1619 | case SSH_AUTH_FAIL_HOSTBASED: | |
1620 | case SSH_AUTH_FAIL_GSSAPI: | |
1621 | case SSH_LOGIN_EXCEED_MAXTRIES: | |
1622 | case SSH_LOGIN_ROOT_DENIED: | |
1623 | case SSH_CONNECTION_CLOSE: | |
1624 | case SSH_INVALID_USER: | |
1625 | audit_event(event); | |
1626 | break; | |
1627 | default: | |
1628 | fatal("Audit event type %d not permitted", event); | |
1629 | } | |
1630 | ||
1631 | return (0); | |
1632 | } | |
1633 | ||
1634 | int | |
1635 | mm_answer_audit_command(int socket, Buffer *m) | |
1636 | { | |
1637 | u_int len; | |
1638 | char *cmd; | |
1639 | ||
1640 | debug3("%s entering", __func__); | |
1641 | cmd = buffer_get_string(m, &len); | |
1642 | /* sanity check command, if so how? */ | |
1643 | audit_run_command(cmd); | |
1644 | xfree(cmd); | |
dfddba3d | 1645 | return (0); |
1646 | } | |
1647 | #endif /* SSH_AUDIT_EVENTS */ | |
1648 | ||
826f3a39 | 1649 | void |
1650 | monitor_apply_keystate(struct monitor *pmonitor) | |
1651 | { | |
1652 | if (compat20) { | |
1653 | set_newkeys(MODE_IN); | |
1654 | set_newkeys(MODE_OUT); | |
1655 | } else { | |
826f3a39 | 1656 | packet_set_protocol_flags(child_state.ssh1protoflags); |
44a053a3 | 1657 | packet_set_encryption_key(child_state.ssh1key, |
1658 | child_state.ssh1keylen, child_state.ssh1cipher); | |
1659 | xfree(child_state.ssh1key); | |
826f3a39 | 1660 | } |
1661 | ||
44a053a3 | 1662 | /* for rc4 and other stateful ciphers */ |
826f3a39 | 1663 | packet_set_keycontext(MODE_OUT, child_state.keyout); |
1664 | xfree(child_state.keyout); | |
1665 | packet_set_keycontext(MODE_IN, child_state.keyin); | |
1666 | xfree(child_state.keyin); | |
1667 | ||
1668 | if (!compat20) { | |
1669 | packet_set_iv(MODE_OUT, child_state.ivout); | |
1670 | xfree(child_state.ivout); | |
1671 | packet_set_iv(MODE_IN, child_state.ivin); | |
1672 | xfree(child_state.ivin); | |
1673 | } | |
1674 | ||
1675 | memcpy(&incoming_stream, &child_state.incoming, | |
1676 | sizeof(incoming_stream)); | |
1677 | memcpy(&outgoing_stream, &child_state.outgoing, | |
1678 | sizeof(outgoing_stream)); | |
1679 | ||
1680 | /* Update with new address */ | |
44a053a3 | 1681 | if (options.compression) |
1682 | mm_init_compression(pmonitor->m_zlib); | |
826f3a39 | 1683 | |
1684 | /* Network I/O buffers */ | |
1685 | /* XXX inefficient for large buffers, need: buffer_init_from_string */ | |
1686 | buffer_clear(&input); | |
1687 | buffer_append(&input, child_state.input, child_state.ilen); | |
1688 | memset(child_state.input, 0, child_state.ilen); | |
1689 | xfree(child_state.input); | |
1690 | ||
1691 | buffer_clear(&output); | |
1692 | buffer_append(&output, child_state.output, child_state.olen); | |
1693 | memset(child_state.output, 0, child_state.olen); | |
1694 | xfree(child_state.output); | |
1695 | } | |
1696 | ||
1697 | static Kex * | |
1698 | mm_get_kex(Buffer *m) | |
1699 | { | |
1700 | Kex *kex; | |
1701 | void *blob; | |
1702 | u_int bloblen; | |
1703 | ||
30460aeb | 1704 | kex = xcalloc(1, sizeof(*kex)); |
826f3a39 | 1705 | kex->session_id = buffer_get_string(m, &kex->session_id_len); |
44a053a3 | 1706 | if ((session_id2 == NULL) || |
1707 | (kex->session_id_len != session_id2_len) || | |
1708 | (memcmp(kex->session_id, session_id2, session_id2_len) != 0)) | |
1709 | fatal("mm_get_get: internal error: bad session id"); | |
826f3a39 | 1710 | kex->we_need = buffer_get_int(m); |
bfe49944 | 1711 | kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; |
7e82606e | 1712 | kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; |
bfe49944 | 1713 | kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; |
f713db99 | 1714 | kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; |
23987cb8 | 1715 | #ifdef GSSAPI |
7cac2b65 | 1716 | kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server; |
8d212d56 | 1717 | kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server; |
fe4ad273 | 1718 | kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server; |
23987cb8 | 1719 | #endif |
826f3a39 | 1720 | kex->server = 1; |
1721 | kex->hostkey_type = buffer_get_int(m); | |
1722 | kex->kex_type = buffer_get_int(m); | |
1723 | blob = buffer_get_string(m, &bloblen); | |
1724 | buffer_init(&kex->my); | |
1725 | buffer_append(&kex->my, blob, bloblen); | |
1726 | xfree(blob); | |
1727 | blob = buffer_get_string(m, &bloblen); | |
1728 | buffer_init(&kex->peer); | |
1729 | buffer_append(&kex->peer, blob, bloblen); | |
1730 | xfree(blob); | |
1731 | kex->done = 1; | |
1732 | kex->flags = buffer_get_int(m); | |
1733 | kex->client_version_string = buffer_get_string(m, NULL); | |
1734 | kex->server_version_string = buffer_get_string(m, NULL); | |
1735 | kex->load_host_key=&get_hostkey_by_type; | |
1736 | kex->host_key_index=&get_hostkey_index; | |
1737 | ||
1738 | return (kex); | |
1739 | } | |
1740 | ||
1741 | /* This function requries careful sanity checking */ | |
1742 | ||
1743 | void | |
1744 | mm_get_keystate(struct monitor *pmonitor) | |
1745 | { | |
1746 | Buffer m; | |
1747 | u_char *blob, *p; | |
1748 | u_int bloblen, plen; | |
7cac2b65 | 1749 | u_int32_t seqnr, packets; |
5156b1a1 | 1750 | u_int64_t blocks, bytes; |
826f3a39 | 1751 | |
44a053a3 | 1752 | debug3("%s: Waiting for new keys", __func__); |
826f3a39 | 1753 | |
1754 | buffer_init(&m); | |
1755 | mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m); | |
1756 | if (!compat20) { | |
1757 | child_state.ssh1protoflags = buffer_get_int(&m); | |
1758 | child_state.ssh1cipher = buffer_get_int(&m); | |
44a053a3 | 1759 | child_state.ssh1key = buffer_get_string(&m, |
1760 | &child_state.ssh1keylen); | |
826f3a39 | 1761 | child_state.ivout = buffer_get_string(&m, |
1762 | &child_state.ivoutlen); | |
1763 | child_state.ivin = buffer_get_string(&m, &child_state.ivinlen); | |
1764 | goto skip; | |
1765 | } else { | |
1766 | /* Get the Kex for rekeying */ | |
1767 | *pmonitor->m_pkex = mm_get_kex(&m); | |
1768 | } | |
1769 | ||
1770 | blob = buffer_get_string(&m, &bloblen); | |
1771 | current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen); | |
1772 | xfree(blob); | |
1773 | ||
44a053a3 | 1774 | debug3("%s: Waiting for second key", __func__); |
826f3a39 | 1775 | blob = buffer_get_string(&m, &bloblen); |
1776 | current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen); | |
1777 | xfree(blob); | |
1778 | ||
1779 | /* Now get sequence numbers for the packets */ | |
7cac2b65 | 1780 | seqnr = buffer_get_int(&m); |
1781 | blocks = buffer_get_int64(&m); | |
1782 | packets = buffer_get_int(&m); | |
5156b1a1 | 1783 | bytes = buffer_get_int64(&m); |
1784 | packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes); | |
7cac2b65 | 1785 | seqnr = buffer_get_int(&m); |
1786 | blocks = buffer_get_int64(&m); | |
1787 | packets = buffer_get_int(&m); | |
5156b1a1 | 1788 | bytes = buffer_get_int64(&m); |
1789 | packet_set_state(MODE_IN, seqnr, blocks, packets, bytes); | |
826f3a39 | 1790 | |
1791 | skip: | |
1792 | /* Get the key context */ | |
1793 | child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen); | |
1794 | child_state.keyin = buffer_get_string(&m, &child_state.keyinlen); | |
1795 | ||
44a053a3 | 1796 | debug3("%s: Getting compression state", __func__); |
826f3a39 | 1797 | /* Get compression state */ |
1798 | p = buffer_get_string(&m, &plen); | |
1799 | if (plen != sizeof(child_state.outgoing)) | |
44a053a3 | 1800 | fatal("%s: bad request size", __func__); |
826f3a39 | 1801 | memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing)); |
1802 | xfree(p); | |
1803 | ||
1804 | p = buffer_get_string(&m, &plen); | |
1805 | if (plen != sizeof(child_state.incoming)) | |
44a053a3 | 1806 | fatal("%s: bad request size", __func__); |
826f3a39 | 1807 | memcpy(&child_state.incoming, p, sizeof(child_state.incoming)); |
1808 | xfree(p); | |
1809 | ||
1810 | /* Network I/O buffers */ | |
44a053a3 | 1811 | debug3("%s: Getting Network I/O buffers", __func__); |
826f3a39 | 1812 | child_state.input = buffer_get_string(&m, &child_state.ilen); |
1813 | child_state.output = buffer_get_string(&m, &child_state.olen); | |
1814 | ||
1815 | buffer_free(&m); | |
1816 | } | |
1817 | ||
1818 | ||
1819 | /* Allocation functions for zlib */ | |
1820 | void * | |
1821 | mm_zalloc(struct mm_master *mm, u_int ncount, u_int size) | |
1822 | { | |
bfe49944 | 1823 | size_t len = (size_t) size * ncount; |
826f3a39 | 1824 | void *address; |
1825 | ||
d03f4262 | 1826 | if (len == 0 || ncount > SIZE_T_MAX / size) |
276b07a3 | 1827 | fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size); |
1828 | ||
1829 | address = mm_malloc(mm, len); | |
826f3a39 | 1830 | |
1831 | return (address); | |
1832 | } | |
1833 | ||
1834 | void | |
1835 | mm_zfree(struct mm_master *mm, void *address) | |
1836 | { | |
1837 | mm_free(mm, address); | |
1838 | } | |
1839 | ||
1840 | void | |
1841 | mm_init_compression(struct mm_master *mm) | |
1842 | { | |
1843 | outgoing_stream.zalloc = (alloc_func)mm_zalloc; | |
1844 | outgoing_stream.zfree = (free_func)mm_zfree; | |
1845 | outgoing_stream.opaque = mm; | |
1846 | ||
1847 | incoming_stream.zalloc = (alloc_func)mm_zalloc; | |
1848 | incoming_stream.zfree = (free_func)mm_zfree; | |
1849 | incoming_stream.opaque = mm; | |
1850 | } | |
1851 | ||
1852 | /* XXX */ | |
1853 | ||
1854 | #define FD_CLOSEONEXEC(x) do { \ | |
1855 | if (fcntl(x, F_SETFD, 1) == -1) \ | |
1856 | fatal("fcntl(%d, F_SETFD)", x); \ | |
1857 | } while (0) | |
1858 | ||
1859 | static void | |
1860 | monitor_socketpair(int *pair) | |
1861 | { | |
1862 | #ifdef HAVE_SOCKETPAIR | |
1863 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1) | |
44a053a3 | 1864 | fatal("%s: socketpair", __func__); |
826f3a39 | 1865 | #else |
1866 | fatal("%s: UsePrivilegeSeparation=yes not supported", | |
44a053a3 | 1867 | __func__); |
826f3a39 | 1868 | #endif |
1869 | FD_CLOSEONEXEC(pair[0]); | |
1870 | FD_CLOSEONEXEC(pair[1]); | |
1871 | } | |
1872 | ||
1873 | #define MM_MEMSIZE 65536 | |
1874 | ||
1875 | struct monitor * | |
1876 | monitor_init(void) | |
1877 | { | |
1878 | struct monitor *mon; | |
1879 | int pair[2]; | |
1880 | ||
30460aeb | 1881 | mon = xcalloc(1, sizeof(*mon)); |
826f3a39 | 1882 | |
1883 | monitor_socketpair(pair); | |
1884 | ||
1885 | mon->m_recvfd = pair[0]; | |
1886 | mon->m_sendfd = pair[1]; | |
1887 | ||
1888 | /* Used to share zlib space across processes */ | |
44a053a3 | 1889 | if (options.compression) { |
1890 | mon->m_zback = mm_create(NULL, MM_MEMSIZE); | |
1891 | mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE); | |
826f3a39 | 1892 | |
44a053a3 | 1893 | /* Compression needs to share state across borders */ |
1894 | mm_init_compression(mon->m_zlib); | |
1895 | } | |
826f3a39 | 1896 | |
1897 | return mon; | |
1898 | } | |
1899 | ||
1900 | void | |
1901 | monitor_reinit(struct monitor *mon) | |
1902 | { | |
1903 | int pair[2]; | |
1904 | ||
1905 | monitor_socketpair(pair); | |
1906 | ||
1907 | mon->m_recvfd = pair[0]; | |
1908 | mon->m_sendfd = pair[1]; | |
1909 | } | |
b59afbfe | 1910 | |
7cac2b65 | 1911 | #ifdef GSSAPI |
1912 | int | |
7e82606e | 1913 | mm_answer_gss_setup_ctx(int sock, Buffer *m) |
7cac2b65 | 1914 | { |
7e82606e | 1915 | gss_OID_desc goid; |
7cac2b65 | 1916 | OM_uint32 major; |
1917 | u_int len; | |
b59afbfe | 1918 | |
7e82606e | 1919 | goid.elements = buffer_get_string(m, &len); |
1920 | goid.length = len; | |
b59afbfe | 1921 | |
7e82606e | 1922 | major = ssh_gssapi_server_ctx(&gsscontext, &goid); |
e23e524c | 1923 | |
7e82606e | 1924 | xfree(goid.elements); |
7cac2b65 | 1925 | |
1926 | buffer_clear(m); | |
1927 | buffer_put_int(m, major); | |
1928 | ||
08822d99 | 1929 | mm_request_send(sock, MONITOR_ANS_GSSSETUP, m); |
7cac2b65 | 1930 | |
1931 | /* Now we have a context, enable the step */ | |
1932 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1); | |
1933 | ||
1934 | return (0); | |
b59afbfe | 1935 | } |
1936 | ||
1937 | int | |
7e82606e | 1938 | mm_answer_gss_accept_ctx(int sock, Buffer *m) |
7cac2b65 | 1939 | { |
1940 | gss_buffer_desc in; | |
1941 | gss_buffer_desc out = GSS_C_EMPTY_BUFFER; | |
08822d99 | 1942 | OM_uint32 major, minor; |
7cac2b65 | 1943 | OM_uint32 flags = 0; /* GSI needs this */ |
1944 | u_int len; | |
b59afbfe | 1945 | |
7cac2b65 | 1946 | in.value = buffer_get_string(m, &len); |
1947 | in.length = len; | |
1948 | major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags); | |
1949 | xfree(in.value); | |
b59afbfe | 1950 | |
7cac2b65 | 1951 | buffer_clear(m); |
1952 | buffer_put_int(m, major); | |
1953 | buffer_put_string(m, out.value, out.length); | |
1954 | buffer_put_int(m, flags); | |
7e82606e | 1955 | mm_request_send(sock, MONITOR_ANS_GSSSTEP, m); |
b59afbfe | 1956 | |
7cac2b65 | 1957 | gss_release_buffer(&minor, &out); |
b59afbfe | 1958 | |
08822d99 | 1959 | if (major == GSS_S_COMPLETE) { |
7cac2b65 | 1960 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0); |
1961 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1962 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); | |
540d72c3 | 1963 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1); |
fe4ad273 | 1964 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1); |
e23e524c | 1965 | } |
7cac2b65 | 1966 | return (0); |
b59afbfe | 1967 | } |
e23e524c | 1968 | |
540d72c3 | 1969 | int |
7e82606e | 1970 | mm_answer_gss_checkmic(int sock, Buffer *m) |
540d72c3 | 1971 | { |
1972 | gss_buffer_desc gssbuf, mic; | |
1973 | OM_uint32 ret; | |
1974 | u_int len; | |
1975 | ||
1976 | gssbuf.value = buffer_get_string(m, &len); | |
1977 | gssbuf.length = len; | |
1978 | mic.value = buffer_get_string(m, &len); | |
1979 | mic.length = len; | |
1980 | ||
1981 | ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic); | |
1982 | ||
1983 | xfree(gssbuf.value); | |
1984 | xfree(mic.value); | |
1985 | ||
1986 | buffer_clear(m); | |
1987 | buffer_put_int(m, ret); | |
1988 | ||
7e82606e | 1989 | mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m); |
540d72c3 | 1990 | |
1991 | if (!GSS_ERROR(ret)) | |
1992 | monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1); | |
1993 | ||
1994 | return (0); | |
1995 | } | |
1996 | ||
b59afbfe | 1997 | int |
7e82606e | 1998 | mm_answer_gss_userok(int sock, Buffer *m) |
7cac2b65 | 1999 | { |
b59afbfe | 2000 | int authenticated; |
2001 | ||
7cac2b65 | 2002 | authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user); |
b59afbfe | 2003 | |
7cac2b65 | 2004 | buffer_clear(m); |
2005 | buffer_put_int(m, authenticated); | |
b59afbfe | 2006 | |
7cac2b65 | 2007 | debug3("%s: sending result %d", __func__, authenticated); |
7e82606e | 2008 | mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m); |
b59afbfe | 2009 | |
08822d99 | 2010 | auth_method = "gssapi-with-mic"; |
7cac2b65 | 2011 | |
2012 | /* Monitor loop will terminate if authenticated */ | |
2013 | return (authenticated); | |
b59afbfe | 2014 | } |
23987cb8 | 2015 | |
fe4ad273 | 2016 | int |
2017 | mm_answer_gss_sign(int socket, Buffer *m) | |
2018 | { | |
2019 | gss_buffer_desc data; | |
2020 | gss_buffer_desc hash = GSS_C_EMPTY_BUFFER; | |
2021 | OM_uint32 major, minor; | |
77e22b94 | 2022 | u_int len; |
b59afbfe | 2023 | |
fe4ad273 | 2024 | data.value = buffer_get_string(m, &len); |
77e22b94 | 2025 | data.length = len; |
fe4ad273 | 2026 | if (data.length != 20) |
e74dc197 | 2027 | fatal("%s: data length incorrect: %d", __func__, (int)data.length); |
b59afbfe | 2028 | |
fe4ad273 | 2029 | /* Save the session ID on the first time around */ |
2030 | if (session_id2_len == 0) { | |
2031 | session_id2_len = data.length; | |
2032 | session_id2 = xmalloc(session_id2_len); | |
2033 | memcpy(session_id2, data.value, session_id2_len); | |
2034 | } | |
2035 | major = ssh_gssapi_sign(gsscontext, &data, &hash); | |
b59afbfe | 2036 | |
fe4ad273 | 2037 | xfree(data.value); |
b59afbfe | 2038 | |
fe4ad273 | 2039 | buffer_clear(m); |
2040 | buffer_put_int(m, major); | |
2041 | buffer_put_string(m, hash.value, hash.length); | |
b59afbfe | 2042 | |
fe4ad273 | 2043 | mm_request_send(socket, MONITOR_ANS_GSSSIGN, m); |
b59afbfe | 2044 | |
fe4ad273 | 2045 | gss_release_buffer(&minor, &hash); |
b59afbfe | 2046 | |
fe4ad273 | 2047 | /* Turn on getpwnam permissions */ |
b59afbfe | 2048 | monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1); |
fe4ad273 | 2049 | |
2050 | return (0); | |
b59afbfe | 2051 | } |
2052 | ||
e23e524c | 2053 | int |
2054 | mm_answer_gss_error(int socket, Buffer *m) { | |
2055 | OM_uint32 major,minor; | |
2056 | char *msg; | |
2057 | ||
2058 | msg=ssh_gssapi_last_error(gsscontext,&major,&minor); | |
2059 | buffer_clear(m); | |
2060 | buffer_put_int(m,major); | |
2061 | buffer_put_int(m,minor); | |
2062 | buffer_put_cstring(m,msg); | |
2063 | ||
2064 | mm_request_send(socket,MONITOR_ANS_GSSERR,m); | |
2065 | ||
2066 | xfree(msg); | |
2067 | ||
2068 | return(0); | |
2069 | } | |
2070 | ||
9eeaa28e | 2071 | int |
2072 | mm_answer_gss_indicate_mechs(int socket, Buffer *m) { | |
2073 | OM_uint32 major,minor; | |
2074 | gss_OID_set mech_set; | |
97a8553e | 2075 | size_t i; |
9eeaa28e | 2076 | |
2077 | major=gss_indicate_mechs(&minor, &mech_set); | |
2078 | ||
2079 | buffer_clear(m); | |
2080 | buffer_put_int(m, major); | |
2081 | buffer_put_int(m, mech_set->count); | |
2082 | for (i=0; i < mech_set->count; i++) { | |
2083 | buffer_put_string(m, mech_set->elements[i].elements, | |
2084 | mech_set->elements[i].length); | |
2085 | } | |
2086 | ||
e23e524c | 2087 | #if !defined(MECHGLUE) /* mechglue memory management bug ??? */ |
2088 | gss_release_oid_set(&minor,&mech_set); | |
2089 | #endif | |
2090 | ||
9eeaa28e | 2091 | mm_request_send(socket,MONITOR_ANS_GSSMECHS,m); |
2092 | ||
2093 | return(0); | |
2094 | } | |
2095 | ||
2096 | int | |
e23e524c | 2097 | mm_answer_gss_localname(int socket, Buffer *m) { |
2098 | char *name; | |
9eeaa28e | 2099 | |
e23e524c | 2100 | ssh_gssapi_localname(&name); |
9eeaa28e | 2101 | |
e23e524c | 2102 | buffer_clear(m); |
2103 | if (name) { | |
2104 | buffer_put_cstring(m, name); | |
2105 | debug3("%s: sending result %s", __func__, name); | |
2106 | xfree(name); | |
2107 | } else { | |
2108 | buffer_put_cstring(m, ""); | |
2109 | debug3("%s: sending result \"\"", __func__); | |
2110 | } | |
2111 | ||
2112 | mm_request_send(socket, MONITOR_ANS_GSSLOCALNAME, m); | |
9eeaa28e | 2113 | |
23987cb8 | 2114 | return(0); |
9eeaa28e | 2115 | } |
b59afbfe | 2116 | #endif /* GSSAPI */ |