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e74dc197 | 1 | /* $OpenBSD: monitor_wrap.c,v 1.60 2007/10/29 04:08:08 dtucker 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" | |
30460aeb | 29 | |
30 | #include <sys/types.h> | |
31 | #include <sys/uio.h> | |
32 | ||
33 | #include <errno.h> | |
34 | #include <pwd.h> | |
35 | #include <signal.h> | |
36 | #include <stdarg.h> | |
37 | #include <stdio.h> | |
38 | #include <string.h> | |
39 | #include <unistd.h> | |
826f3a39 | 40 | |
41 | #include <openssl/bn.h> | |
42 | #include <openssl/dh.h> | |
43 | ||
30460aeb | 44 | #include "xmalloc.h" |
826f3a39 | 45 | #include "ssh.h" |
46 | #include "dh.h" | |
30460aeb | 47 | #include "buffer.h" |
48 | #include "key.h" | |
49 | #include "cipher.h" | |
826f3a39 | 50 | #include "kex.h" |
30460aeb | 51 | #include "hostfile.h" |
826f3a39 | 52 | #include "auth.h" |
bfe49944 | 53 | #include "auth-options.h" |
826f3a39 | 54 | #include "packet.h" |
55 | #include "mac.h" | |
56 | #include "log.h" | |
12a403af | 57 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
58 | #undef TARGET_OS_MAC | |
826f3a39 | 59 | #include "zlib.h" |
12a403af | 60 | #define TARGET_OS_MAC 1 |
61 | #else | |
62 | #include "zlib.h" | |
63 | #endif | |
826f3a39 | 64 | #include "monitor.h" |
30460aeb | 65 | #ifdef GSSAPI |
66 | #include "ssh-gss.h" | |
67 | #endif | |
826f3a39 | 68 | #include "monitor_wrap.h" |
826f3a39 | 69 | #include "atomicio.h" |
70 | #include "monitor_fdpass.h" | |
30460aeb | 71 | #include "misc.h" |
7cac2b65 | 72 | #include "servconf.h" |
826f3a39 | 73 | |
826f3a39 | 74 | #include "channels.h" |
75 | #include "session.h" | |
0b90ac93 | 76 | #include "servconf.h" |
826f3a39 | 77 | |
78 | /* Imports */ | |
79 | extern int compat20; | |
80 | extern Newkeys *newkeys[]; | |
81 | extern z_stream incoming_stream; | |
82 | extern z_stream outgoing_stream; | |
83 | extern struct monitor *pmonitor; | |
84 | extern Buffer input, output; | |
7e82606e | 85 | extern Buffer loginmsg; |
7cac2b65 | 86 | extern ServerOptions options; |
826f3a39 | 87 | |
540d72c3 | 88 | int |
89 | mm_is_monitor(void) | |
90 | { | |
91 | /* | |
92 | * m_pid is only set in the privileged part, and | |
93 | * points to the unprivileged child. | |
94 | */ | |
95 | return (pmonitor && pmonitor->m_pid > 0); | |
96 | } | |
97 | ||
826f3a39 | 98 | void |
7e82606e | 99 | mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) |
826f3a39 | 100 | { |
826f3a39 | 101 | u_int mlen = buffer_len(m); |
d03f4262 | 102 | u_char buf[5]; |
826f3a39 | 103 | |
44a053a3 | 104 | debug3("%s entering: type %d", __func__, type); |
826f3a39 | 105 | |
30460aeb | 106 | put_u32(buf, mlen + 1); |
44a053a3 | 107 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
7e82606e | 108 | if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) |
2ce0bfe4 | 109 | fatal("%s: write: %s", __func__, strerror(errno)); |
7e82606e | 110 | if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) |
2ce0bfe4 | 111 | fatal("%s: write: %s", __func__, strerror(errno)); |
826f3a39 | 112 | } |
113 | ||
114 | void | |
7e82606e | 115 | mm_request_receive(int sock, Buffer *m) |
826f3a39 | 116 | { |
117 | u_char buf[4]; | |
826f3a39 | 118 | u_int msg_len; |
119 | ||
44a053a3 | 120 | debug3("%s entering", __func__); |
826f3a39 | 121 | |
2ce0bfe4 | 122 | if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { |
123 | if (errno == EPIPE) | |
540d72c3 | 124 | cleanup_exit(255); |
2ce0bfe4 | 125 | fatal("%s: read: %s", __func__, strerror(errno)); |
826f3a39 | 126 | } |
30460aeb | 127 | msg_len = get_u32(buf); |
826f3a39 | 128 | if (msg_len > 256 * 1024) |
44a053a3 | 129 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
826f3a39 | 130 | buffer_clear(m); |
131 | buffer_append_space(m, msg_len); | |
2ce0bfe4 | 132 | if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) |
133 | fatal("%s: read: %s", __func__, strerror(errno)); | |
826f3a39 | 134 | } |
135 | ||
136 | void | |
7e82606e | 137 | mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) |
826f3a39 | 138 | { |
139 | u_char rtype; | |
140 | ||
44a053a3 | 141 | debug3("%s entering: type %d", __func__, type); |
826f3a39 | 142 | |
7e82606e | 143 | mm_request_receive(sock, m); |
826f3a39 | 144 | rtype = buffer_get_char(m); |
145 | if (rtype != type) | |
44a053a3 | 146 | fatal("%s: read: rtype %d != type %d", __func__, |
826f3a39 | 147 | rtype, type); |
148 | } | |
149 | ||
150 | DH * | |
151 | mm_choose_dh(int min, int nbits, int max) | |
152 | { | |
153 | BIGNUM *p, *g; | |
154 | int success = 0; | |
155 | Buffer m; | |
156 | ||
157 | buffer_init(&m); | |
158 | buffer_put_int(&m, min); | |
159 | buffer_put_int(&m, nbits); | |
160 | buffer_put_int(&m, max); | |
161 | ||
162 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); | |
163 | ||
44a053a3 | 164 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
826f3a39 | 165 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
166 | ||
167 | success = buffer_get_char(&m); | |
168 | if (success == 0) | |
44a053a3 | 169 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
826f3a39 | 170 | |
171 | if ((p = BN_new()) == NULL) | |
44a053a3 | 172 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 173 | if ((g = BN_new()) == NULL) |
44a053a3 | 174 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 175 | buffer_get_bignum2(&m, p); |
176 | buffer_get_bignum2(&m, g); | |
177 | ||
44a053a3 | 178 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
826f3a39 | 179 | buffer_free(&m); |
180 | ||
181 | return (dh_new_group(g, p)); | |
182 | } | |
183 | ||
184 | int | |
185 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
186 | { | |
187 | Kex *kex = *pmonitor->m_pkex; | |
188 | Buffer m; | |
189 | ||
44a053a3 | 190 | debug3("%s entering", __func__); |
826f3a39 | 191 | |
192 | buffer_init(&m); | |
193 | buffer_put_int(&m, kex->host_key_index(key)); | |
194 | buffer_put_string(&m, data, datalen); | |
195 | ||
196 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); | |
197 | ||
44a053a3 | 198 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
826f3a39 | 199 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
200 | *sigp = buffer_get_string(&m, lenp); | |
201 | buffer_free(&m); | |
202 | ||
203 | return (0); | |
204 | } | |
205 | ||
206 | struct passwd * | |
7e82606e | 207 | mm_getpwnamallow(const char *username) |
826f3a39 | 208 | { |
209 | Buffer m; | |
210 | struct passwd *pw; | |
0b90ac93 | 211 | u_int len; |
212 | ServerOptions *newopts; | |
826f3a39 | 213 | |
44a053a3 | 214 | debug3("%s entering", __func__); |
826f3a39 | 215 | |
216 | buffer_init(&m); | |
7e82606e | 217 | buffer_put_cstring(&m, username); |
826f3a39 | 218 | |
219 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); | |
220 | ||
44a053a3 | 221 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
826f3a39 | 222 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
223 | ||
224 | if (buffer_get_char(&m) == 0) { | |
e74dc197 | 225 | pw = NULL; |
226 | goto out; | |
826f3a39 | 227 | } |
0b90ac93 | 228 | pw = buffer_get_string(&m, &len); |
229 | if (len != sizeof(struct passwd)) | |
44a053a3 | 230 | fatal("%s: struct passwd size mismatch", __func__); |
826f3a39 | 231 | pw->pw_name = buffer_get_string(&m, NULL); |
232 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
233 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
234 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
235 | pw->pw_class = buffer_get_string(&m, NULL); | |
236 | #endif | |
237 | pw->pw_dir = buffer_get_string(&m, NULL); | |
238 | pw->pw_shell = buffer_get_string(&m, NULL); | |
0b90ac93 | 239 | |
e74dc197 | 240 | out: |
0b90ac93 | 241 | /* copy options block as a Match directive may have changed some */ |
242 | newopts = buffer_get_string(&m, &len); | |
243 | if (len != sizeof(*newopts)) | |
244 | fatal("%s: option block size mismatch", __func__); | |
245 | if (newopts->banner != NULL) | |
246 | newopts->banner = buffer_get_string(&m, NULL); | |
247 | copy_set_server_options(&options, newopts, 1); | |
248 | xfree(newopts); | |
249 | ||
826f3a39 | 250 | buffer_free(&m); |
251 | ||
252 | return (pw); | |
253 | } | |
254 | ||
540d72c3 | 255 | char * |
256 | mm_auth2_read_banner(void) | |
826f3a39 | 257 | { |
258 | Buffer m; | |
259 | char *banner; | |
260 | ||
44a053a3 | 261 | debug3("%s entering", __func__); |
826f3a39 | 262 | |
263 | buffer_init(&m); | |
264 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); | |
265 | buffer_clear(&m); | |
266 | ||
540d72c3 | 267 | mm_request_receive_expect(pmonitor->m_recvfd, |
268 | MONITOR_ANS_AUTH2_READ_BANNER, &m); | |
826f3a39 | 269 | banner = buffer_get_string(&m, NULL); |
270 | buffer_free(&m); | |
44a053a3 | 271 | |
540d72c3 | 272 | /* treat empty banner as missing banner */ |
273 | if (strlen(banner) == 0) { | |
274 | xfree(banner); | |
275 | banner = NULL; | |
276 | } | |
826f3a39 | 277 | return (banner); |
278 | } | |
279 | ||
280 | /* Inform the privileged process about service and style */ | |
281 | ||
282 | void | |
283 | mm_inform_authserv(char *service, char *style) | |
284 | { | |
285 | Buffer m; | |
286 | ||
44a053a3 | 287 | debug3("%s entering", __func__); |
826f3a39 | 288 | |
289 | buffer_init(&m); | |
290 | buffer_put_cstring(&m, service); | |
291 | buffer_put_cstring(&m, style ? style : ""); | |
292 | ||
293 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); | |
294 | ||
295 | buffer_free(&m); | |
296 | } | |
297 | ||
298 | /* Do the password authentication */ | |
299 | int | |
300 | mm_auth_password(Authctxt *authctxt, char *password) | |
301 | { | |
302 | Buffer m; | |
303 | int authenticated = 0; | |
304 | ||
44a053a3 | 305 | debug3("%s entering", __func__); |
826f3a39 | 306 | |
307 | buffer_init(&m); | |
308 | buffer_put_cstring(&m, password); | |
309 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); | |
310 | ||
44a053a3 | 311 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
826f3a39 | 312 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
313 | ||
314 | authenticated = buffer_get_int(&m); | |
315 | ||
316 | buffer_free(&m); | |
317 | ||
318 | debug3("%s: user %sauthenticated", | |
44a053a3 | 319 | __func__, authenticated ? "" : "not "); |
826f3a39 | 320 | return (authenticated); |
321 | } | |
322 | ||
323 | int | |
324 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
325 | { | |
326 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
327 | } | |
328 | ||
329 | int | |
330 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
331 | Key *key) | |
332 | { | |
333 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
334 | } | |
335 | ||
336 | int | |
337 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
338 | char *host, Key *key) | |
339 | { | |
340 | int ret; | |
341 | ||
342 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
343 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
344 | key->type = KEY_RSA1; | |
345 | return (ret); | |
346 | } | |
347 | ||
348 | static void | |
349 | mm_send_debug(Buffer *m) | |
350 | { | |
351 | char *msg; | |
352 | ||
353 | while (buffer_len(m)) { | |
354 | msg = buffer_get_string(m, NULL); | |
44a053a3 | 355 | debug3("%s: Sending debug: %s", __func__, msg); |
826f3a39 | 356 | packet_send_debug("%s", msg); |
357 | xfree(msg); | |
358 | } | |
359 | } | |
360 | ||
361 | int | |
362 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
363 | { | |
364 | Buffer m; | |
365 | u_char *blob; | |
366 | u_int len; | |
bfe49944 | 367 | int allowed = 0, have_forced = 0; |
826f3a39 | 368 | |
44a053a3 | 369 | debug3("%s entering", __func__); |
826f3a39 | 370 | |
371 | /* Convert the key to a blob and the pass it over */ | |
372 | if (!key_to_blob(key, &blob, &len)) | |
373 | return (0); | |
374 | ||
375 | buffer_init(&m); | |
376 | buffer_put_int(&m, type); | |
377 | buffer_put_cstring(&m, user ? user : ""); | |
378 | buffer_put_cstring(&m, host ? host : ""); | |
379 | buffer_put_string(&m, blob, len); | |
380 | xfree(blob); | |
381 | ||
382 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); | |
383 | ||
44a053a3 | 384 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
826f3a39 | 385 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
386 | ||
387 | allowed = buffer_get_int(&m); | |
388 | ||
bfe49944 | 389 | /* fake forced command */ |
390 | auth_clear_options(); | |
391 | have_forced = buffer_get_int(&m); | |
392 | forced_command = have_forced ? xstrdup("true") : NULL; | |
393 | ||
826f3a39 | 394 | /* Send potential debug messages */ |
395 | mm_send_debug(&m); | |
396 | ||
397 | buffer_free(&m); | |
398 | ||
399 | return (allowed); | |
400 | } | |
401 | ||
402 | /* | |
403 | * This key verify needs to send the key type along, because the | |
404 | * privileged parent makes the decision if the key is allowed | |
405 | * for authentication. | |
406 | */ | |
407 | ||
408 | int | |
409 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
410 | { | |
411 | Buffer m; | |
412 | u_char *blob; | |
413 | u_int len; | |
414 | int verified = 0; | |
415 | ||
44a053a3 | 416 | debug3("%s entering", __func__); |
826f3a39 | 417 | |
418 | /* Convert the key to a blob and the pass it over */ | |
419 | if (!key_to_blob(key, &blob, &len)) | |
420 | return (0); | |
421 | ||
422 | buffer_init(&m); | |
423 | buffer_put_string(&m, blob, len); | |
424 | buffer_put_string(&m, sig, siglen); | |
425 | buffer_put_string(&m, data, datalen); | |
426 | xfree(blob); | |
427 | ||
428 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); | |
429 | ||
44a053a3 | 430 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
826f3a39 | 431 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
432 | ||
433 | verified = buffer_get_int(&m); | |
434 | ||
435 | buffer_free(&m); | |
436 | ||
437 | return (verified); | |
438 | } | |
439 | ||
440 | /* Export key state after authentication */ | |
441 | Newkeys * | |
442 | mm_newkeys_from_blob(u_char *blob, int blen) | |
443 | { | |
444 | Buffer b; | |
445 | u_int len; | |
446 | Newkeys *newkey = NULL; | |
447 | Enc *enc; | |
448 | Mac *mac; | |
449 | Comp *comp; | |
450 | ||
44a053a3 | 451 | debug3("%s: %p(%d)", __func__, blob, blen); |
826f3a39 | 452 | #ifdef DEBUG_PK |
453 | dump_base64(stderr, blob, blen); | |
454 | #endif | |
455 | buffer_init(&b); | |
456 | buffer_append(&b, blob, blen); | |
457 | ||
458 | newkey = xmalloc(sizeof(*newkey)); | |
459 | enc = &newkey->enc; | |
460 | mac = &newkey->mac; | |
461 | comp = &newkey->comp; | |
462 | ||
463 | /* Enc structure */ | |
464 | enc->name = buffer_get_string(&b, NULL); | |
465 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
466 | enc->enabled = buffer_get_int(&b); | |
467 | enc->block_size = buffer_get_int(&b); | |
468 | enc->key = buffer_get_string(&b, &enc->key_len); | |
469 | enc->iv = buffer_get_string(&b, &len); | |
470 | if (len != enc->block_size) | |
d03f4262 | 471 | fatal("%s: bad ivlen: expected %u != %u", __func__, |
826f3a39 | 472 | enc->block_size, len); |
473 | ||
474 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
44a053a3 | 475 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
826f3a39 | 476 | enc->name, enc->cipher); |
477 | ||
478 | /* Mac structure */ | |
479 | mac->name = buffer_get_string(&b, NULL); | |
fa0f0f45 | 480 | if (mac->name == NULL || mac_setup(mac, mac->name) == -1) |
481 | fatal("%s: can not setup mac %s", __func__, mac->name); | |
826f3a39 | 482 | mac->enabled = buffer_get_int(&b); |
483 | mac->key = buffer_get_string(&b, &len); | |
484 | if (len > mac->key_len) | |
d03f4262 | 485 | fatal("%s: bad mac key length: %u > %d", __func__, len, |
826f3a39 | 486 | mac->key_len); |
487 | mac->key_len = len; | |
488 | ||
489 | /* Comp structure */ | |
490 | comp->type = buffer_get_int(&b); | |
491 | comp->enabled = buffer_get_int(&b); | |
492 | comp->name = buffer_get_string(&b, NULL); | |
493 | ||
494 | len = buffer_len(&b); | |
495 | if (len != 0) | |
d03f4262 | 496 | error("newkeys_from_blob: remaining bytes in blob %u", len); |
826f3a39 | 497 | buffer_free(&b); |
498 | return (newkey); | |
499 | } | |
500 | ||
501 | int | |
502 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
503 | { | |
504 | Buffer b; | |
505 | int len; | |
826f3a39 | 506 | Enc *enc; |
507 | Mac *mac; | |
508 | Comp *comp; | |
509 | Newkeys *newkey = newkeys[mode]; | |
510 | ||
44a053a3 | 511 | debug3("%s: converting %p", __func__, newkey); |
826f3a39 | 512 | |
513 | if (newkey == NULL) { | |
44a053a3 | 514 | error("%s: newkey == NULL", __func__); |
826f3a39 | 515 | return 0; |
516 | } | |
517 | enc = &newkey->enc; | |
518 | mac = &newkey->mac; | |
519 | comp = &newkey->comp; | |
520 | ||
521 | buffer_init(&b); | |
522 | /* Enc structure */ | |
523 | buffer_put_cstring(&b, enc->name); | |
524 | /* The cipher struct is constant and shared, you export pointer */ | |
525 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
526 | buffer_put_int(&b, enc->enabled); | |
527 | buffer_put_int(&b, enc->block_size); | |
528 | buffer_put_string(&b, enc->key, enc->key_len); | |
529 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
530 | buffer_put_string(&b, enc->iv, enc->block_size); | |
531 | ||
532 | /* Mac structure */ | |
533 | buffer_put_cstring(&b, mac->name); | |
534 | buffer_put_int(&b, mac->enabled); | |
535 | buffer_put_string(&b, mac->key, mac->key_len); | |
536 | ||
537 | /* Comp structure */ | |
538 | buffer_put_int(&b, comp->type); | |
539 | buffer_put_int(&b, comp->enabled); | |
540 | buffer_put_cstring(&b, comp->name); | |
541 | ||
542 | len = buffer_len(&b); | |
826f3a39 | 543 | if (lenp != NULL) |
544 | *lenp = len; | |
d03f4262 | 545 | if (blobp != NULL) { |
546 | *blobp = xmalloc(len); | |
547 | memcpy(*blobp, buffer_ptr(&b), len); | |
548 | } | |
549 | memset(buffer_ptr(&b), 0, len); | |
550 | buffer_free(&b); | |
826f3a39 | 551 | return len; |
552 | } | |
553 | ||
554 | static void | |
555 | mm_send_kex(Buffer *m, Kex *kex) | |
556 | { | |
557 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
558 | buffer_put_int(m, kex->we_need); | |
559 | buffer_put_int(m, kex->hostkey_type); | |
560 | buffer_put_int(m, kex->kex_type); | |
561 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
562 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
563 | buffer_put_int(m, kex->flags); | |
564 | buffer_put_cstring(m, kex->client_version_string); | |
565 | buffer_put_cstring(m, kex->server_version_string); | |
566 | } | |
567 | ||
568 | void | |
7e82606e | 569 | mm_send_keystate(struct monitor *monitor) |
826f3a39 | 570 | { |
571 | Buffer m; | |
572 | u_char *blob, *p; | |
573 | u_int bloblen, plen; | |
7cac2b65 | 574 | u_int32_t seqnr, packets; |
575 | u_int64_t blocks; | |
826f3a39 | 576 | |
577 | buffer_init(&m); | |
578 | ||
579 | if (!compat20) { | |
580 | u_char iv[24]; | |
44a053a3 | 581 | u_char *key; |
582 | u_int ivlen, keylen; | |
826f3a39 | 583 | |
584 | buffer_put_int(&m, packet_get_protocol_flags()); | |
585 | ||
586 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
587 | ||
44a053a3 | 588 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
589 | keylen = packet_get_encryption_key(NULL); | |
590 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
591 | keylen = packet_get_encryption_key(key); | |
592 | buffer_put_string(&m, key, keylen); | |
593 | memset(key, 0, keylen); | |
594 | xfree(key); | |
595 | ||
826f3a39 | 596 | ivlen = packet_get_keyiv_len(MODE_OUT); |
597 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
598 | buffer_put_string(&m, iv, ivlen); | |
599 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
600 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
601 | buffer_put_string(&m, iv, ivlen); | |
602 | goto skip; | |
603 | } else { | |
604 | /* Kex for rekeying */ | |
7e82606e | 605 | mm_send_kex(&m, *monitor->m_pkex); |
826f3a39 | 606 | } |
607 | ||
608 | debug3("%s: Sending new keys: %p %p", | |
44a053a3 | 609 | __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
826f3a39 | 610 | |
611 | /* Keys from Kex */ | |
612 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
44a053a3 | 613 | fatal("%s: conversion of newkeys failed", __func__); |
826f3a39 | 614 | |
615 | buffer_put_string(&m, blob, bloblen); | |
616 | xfree(blob); | |
617 | ||
618 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
44a053a3 | 619 | fatal("%s: conversion of newkeys failed", __func__); |
826f3a39 | 620 | |
621 | buffer_put_string(&m, blob, bloblen); | |
622 | xfree(blob); | |
623 | ||
7cac2b65 | 624 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets); |
625 | buffer_put_int(&m, seqnr); | |
626 | buffer_put_int64(&m, blocks); | |
627 | buffer_put_int(&m, packets); | |
628 | packet_get_state(MODE_IN, &seqnr, &blocks, &packets); | |
629 | buffer_put_int(&m, seqnr); | |
630 | buffer_put_int64(&m, blocks); | |
631 | buffer_put_int(&m, packets); | |
826f3a39 | 632 | |
44a053a3 | 633 | debug3("%s: New keys have been sent", __func__); |
826f3a39 | 634 | skip: |
635 | /* More key context */ | |
636 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
637 | p = xmalloc(plen+1); | |
638 | packet_get_keycontext(MODE_OUT, p); | |
639 | buffer_put_string(&m, p, plen); | |
640 | xfree(p); | |
641 | ||
642 | plen = packet_get_keycontext(MODE_IN, NULL); | |
643 | p = xmalloc(plen+1); | |
644 | packet_get_keycontext(MODE_IN, p); | |
645 | buffer_put_string(&m, p, plen); | |
646 | xfree(p); | |
647 | ||
648 | /* Compression state */ | |
44a053a3 | 649 | debug3("%s: Sending compression state", __func__); |
826f3a39 | 650 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
651 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
652 | ||
653 | /* Network I/O buffers */ | |
654 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
655 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
656 | ||
7e82606e | 657 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); |
44a053a3 | 658 | debug3("%s: Finished sending state", __func__); |
826f3a39 | 659 | |
660 | buffer_free(&m); | |
661 | } | |
662 | ||
663 | int | |
30460aeb | 664 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) |
826f3a39 | 665 | { |
666 | Buffer m; | |
7e82606e | 667 | char *p, *msg; |
826f3a39 | 668 | int success = 0; |
669 | ||
670 | buffer_init(&m); | |
671 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); | |
672 | ||
44a053a3 | 673 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
826f3a39 | 674 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
675 | ||
676 | success = buffer_get_int(&m); | |
677 | if (success == 0) { | |
44a053a3 | 678 | debug3("%s: pty alloc failed", __func__); |
826f3a39 | 679 | buffer_free(&m); |
680 | return (0); | |
681 | } | |
682 | p = buffer_get_string(&m, NULL); | |
7e82606e | 683 | msg = buffer_get_string(&m, NULL); |
826f3a39 | 684 | buffer_free(&m); |
685 | ||
686 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
687 | xfree(p); | |
688 | ||
7e82606e | 689 | buffer_append(&loginmsg, msg, strlen(msg)); |
690 | xfree(msg); | |
691 | ||
e74dc197 | 692 | if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || |
693 | (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) | |
694 | fatal("%s: receive fds failed", __func__); | |
826f3a39 | 695 | |
696 | /* Success */ | |
697 | return (1); | |
698 | } | |
699 | ||
700 | void | |
540d72c3 | 701 | mm_session_pty_cleanup2(Session *s) |
826f3a39 | 702 | { |
826f3a39 | 703 | Buffer m; |
704 | ||
705 | if (s->ttyfd == -1) | |
706 | return; | |
707 | buffer_init(&m); | |
708 | buffer_put_cstring(&m, s->tty); | |
709 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); | |
710 | buffer_free(&m); | |
711 | ||
712 | /* closed dup'ed master */ | |
713 | if (close(s->ptymaster) < 0) | |
714 | error("close(s->ptymaster): %s", strerror(errno)); | |
715 | ||
716 | /* unlink pty from session */ | |
717 | s->ttyfd = -1; | |
718 | } | |
719 | ||
720 | #ifdef USE_PAM | |
721 | void | |
12a403af | 722 | mm_start_pam(Authctxt *authctxt) |
826f3a39 | 723 | { |
724 | Buffer m; | |
725 | ||
44a053a3 | 726 | debug3("%s entering", __func__); |
7cac2b65 | 727 | if (!options.use_pam) |
728 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
826f3a39 | 729 | |
730 | buffer_init(&m); | |
826f3a39 | 731 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); |
732 | ||
733 | buffer_free(&m); | |
734 | } | |
7cac2b65 | 735 | |
736 | u_int | |
737 | mm_do_pam_account(void) | |
738 | { | |
739 | Buffer m; | |
740 | u_int ret; | |
dfddba3d | 741 | char *msg; |
7cac2b65 | 742 | |
743 | debug3("%s entering", __func__); | |
744 | if (!options.use_pam) | |
745 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
746 | ||
747 | buffer_init(&m); | |
748 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); | |
749 | ||
540d72c3 | 750 | mm_request_receive_expect(pmonitor->m_recvfd, |
7cac2b65 | 751 | MONITOR_ANS_PAM_ACCOUNT, &m); |
752 | ret = buffer_get_int(&m); | |
dfddba3d | 753 | msg = buffer_get_string(&m, NULL); |
754 | buffer_append(&loginmsg, msg, strlen(msg)); | |
755 | xfree(msg); | |
7cac2b65 | 756 | |
757 | buffer_free(&m); | |
540d72c3 | 758 | |
7cac2b65 | 759 | debug3("%s returning %d", __func__, ret); |
760 | ||
761 | return (ret); | |
762 | } | |
763 | ||
764 | void * | |
765 | mm_sshpam_init_ctx(Authctxt *authctxt) | |
766 | { | |
767 | Buffer m; | |
768 | int success; | |
769 | ||
770 | debug3("%s", __func__); | |
771 | buffer_init(&m); | |
772 | buffer_put_cstring(&m, authctxt->user); | |
773 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); | |
774 | debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); | |
775 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); | |
776 | success = buffer_get_int(&m); | |
777 | if (success == 0) { | |
778 | debug3("%s: pam_init_ctx failed", __func__); | |
779 | buffer_free(&m); | |
780 | return (NULL); | |
781 | } | |
782 | buffer_free(&m); | |
783 | return (authctxt); | |
784 | } | |
785 | ||
786 | int | |
787 | mm_sshpam_query(void *ctx, char **name, char **info, | |
788 | u_int *num, char ***prompts, u_int **echo_on) | |
789 | { | |
790 | Buffer m; | |
2ce0bfe4 | 791 | u_int i; |
792 | int ret; | |
7cac2b65 | 793 | |
794 | debug3("%s", __func__); | |
795 | buffer_init(&m); | |
796 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); | |
797 | debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); | |
798 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); | |
799 | ret = buffer_get_int(&m); | |
800 | debug3("%s: pam_query returned %d", __func__, ret); | |
801 | *name = buffer_get_string(&m, NULL); | |
802 | *info = buffer_get_string(&m, NULL); | |
803 | *num = buffer_get_int(&m); | |
30460aeb | 804 | if (*num > PAM_MAX_NUM_MSG) |
805 | fatal("%s: recieved %u PAM messages, expected <= %u", | |
806 | __func__, *num, PAM_MAX_NUM_MSG); | |
807 | *prompts = xcalloc((*num + 1), sizeof(char *)); | |
808 | *echo_on = xcalloc((*num + 1), sizeof(u_int)); | |
7cac2b65 | 809 | for (i = 0; i < *num; ++i) { |
810 | (*prompts)[i] = buffer_get_string(&m, NULL); | |
811 | (*echo_on)[i] = buffer_get_int(&m); | |
812 | } | |
813 | buffer_free(&m); | |
814 | return (ret); | |
815 | } | |
816 | ||
817 | int | |
818 | mm_sshpam_respond(void *ctx, u_int num, char **resp) | |
819 | { | |
820 | Buffer m; | |
2ce0bfe4 | 821 | u_int i; |
822 | int ret; | |
7cac2b65 | 823 | |
824 | debug3("%s", __func__); | |
825 | buffer_init(&m); | |
826 | buffer_put_int(&m, num); | |
827 | for (i = 0; i < num; ++i) | |
828 | buffer_put_cstring(&m, resp[i]); | |
829 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); | |
830 | debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); | |
831 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); | |
832 | ret = buffer_get_int(&m); | |
833 | debug3("%s: pam_respond returned %d", __func__, ret); | |
834 | buffer_free(&m); | |
835 | return (ret); | |
836 | } | |
837 | ||
838 | void | |
839 | mm_sshpam_free_ctx(void *ctxtp) | |
840 | { | |
841 | Buffer m; | |
842 | ||
843 | debug3("%s", __func__); | |
844 | buffer_init(&m); | |
845 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); | |
846 | debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); | |
847 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); | |
848 | buffer_free(&m); | |
849 | } | |
826f3a39 | 850 | #endif /* USE_PAM */ |
851 | ||
852 | /* Request process termination */ | |
853 | ||
854 | void | |
855 | mm_terminate(void) | |
856 | { | |
857 | Buffer m; | |
858 | ||
859 | buffer_init(&m); | |
860 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); | |
861 | buffer_free(&m); | |
862 | } | |
863 | ||
864 | int | |
865 | mm_ssh1_session_key(BIGNUM *num) | |
866 | { | |
867 | int rsafail; | |
868 | Buffer m; | |
869 | ||
870 | buffer_init(&m); | |
871 | buffer_put_bignum2(&m, num); | |
872 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); | |
873 | ||
874 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); | |
875 | ||
876 | rsafail = buffer_get_int(&m); | |
877 | buffer_get_bignum2(&m, num); | |
878 | ||
879 | buffer_free(&m); | |
880 | ||
881 | return (rsafail); | |
882 | } | |
883 | ||
884 | static void | |
885 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
886 | char ***prompts, u_int **echo_on) | |
887 | { | |
44a053a3 | 888 | *name = xstrdup(""); |
889 | *infotxt = xstrdup(""); | |
826f3a39 | 890 | *numprompts = 1; |
30460aeb | 891 | *prompts = xcalloc(*numprompts, sizeof(char *)); |
892 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); | |
826f3a39 | 893 | (*echo_on)[0] = 0; |
894 | } | |
895 | ||
896 | int | |
897 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
898 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
899 | { | |
900 | Buffer m; | |
bfe49944 | 901 | u_int success; |
826f3a39 | 902 | char *challenge; |
903 | ||
44a053a3 | 904 | debug3("%s: entering", __func__); |
826f3a39 | 905 | |
906 | buffer_init(&m); | |
907 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); | |
908 | ||
909 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, | |
910 | &m); | |
bfe49944 | 911 | success = buffer_get_int(&m); |
912 | if (success == 0) { | |
44a053a3 | 913 | debug3("%s: no challenge", __func__); |
826f3a39 | 914 | buffer_free(&m); |
915 | return (-1); | |
916 | } | |
917 | ||
918 | /* Get the challenge, and format the response */ | |
919 | challenge = buffer_get_string(&m, NULL); | |
920 | buffer_free(&m); | |
921 | ||
922 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
923 | (*prompts)[0] = challenge; | |
924 | ||
44a053a3 | 925 | debug3("%s: received challenge: %s", __func__, challenge); |
826f3a39 | 926 | |
927 | return (0); | |
928 | } | |
929 | ||
930 | int | |
931 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
932 | { | |
933 | Buffer m; | |
934 | int authok; | |
935 | ||
44a053a3 | 936 | debug3("%s: entering", __func__); |
826f3a39 | 937 | if (numresponses != 1) |
938 | return (-1); | |
939 | ||
940 | buffer_init(&m); | |
941 | buffer_put_cstring(&m, responses[0]); | |
942 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); | |
943 | ||
944 | mm_request_receive_expect(pmonitor->m_recvfd, | |
945 | MONITOR_ANS_BSDAUTHRESPOND, &m); | |
946 | ||
947 | authok = buffer_get_int(&m); | |
948 | buffer_free(&m); | |
949 | ||
950 | return ((authok == 0) ? -1 : 0); | |
951 | } | |
952 | ||
7e82606e | 953 | #ifdef SKEY |
826f3a39 | 954 | int |
955 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
956 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
957 | { | |
958 | Buffer m; | |
bfe49944 | 959 | u_int success; |
30460aeb | 960 | char *challenge; |
826f3a39 | 961 | |
44a053a3 | 962 | debug3("%s: entering", __func__); |
826f3a39 | 963 | |
964 | buffer_init(&m); | |
965 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); | |
966 | ||
967 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, | |
968 | &m); | |
bfe49944 | 969 | success = buffer_get_int(&m); |
970 | if (success == 0) { | |
44a053a3 | 971 | debug3("%s: no challenge", __func__); |
826f3a39 | 972 | buffer_free(&m); |
973 | return (-1); | |
974 | } | |
975 | ||
976 | /* Get the challenge, and format the response */ | |
977 | challenge = buffer_get_string(&m, NULL); | |
978 | buffer_free(&m); | |
979 | ||
44a053a3 | 980 | debug3("%s: received challenge: %s", __func__, challenge); |
826f3a39 | 981 | |
982 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
983 | ||
30460aeb | 984 | xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); |
826f3a39 | 985 | xfree(challenge); |
986 | ||
987 | return (0); | |
988 | } | |
989 | ||
990 | int | |
991 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
992 | { | |
993 | Buffer m; | |
994 | int authok; | |
995 | ||
44a053a3 | 996 | debug3("%s: entering", __func__); |
826f3a39 | 997 | if (numresponses != 1) |
998 | return (-1); | |
999 | ||
1000 | buffer_init(&m); | |
1001 | buffer_put_cstring(&m, responses[0]); | |
1002 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); | |
1003 | ||
1004 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1005 | MONITOR_ANS_SKEYRESPOND, &m); | |
1006 | ||
1007 | authok = buffer_get_int(&m); | |
1008 | buffer_free(&m); | |
1009 | ||
1010 | return ((authok == 0) ? -1 : 0); | |
1011 | } | |
7e82606e | 1012 | #endif /* SKEY */ |
826f3a39 | 1013 | |
1014 | void | |
1015 | mm_ssh1_session_id(u_char session_id[16]) | |
1016 | { | |
1017 | Buffer m; | |
1018 | int i; | |
1019 | ||
44a053a3 | 1020 | debug3("%s entering", __func__); |
826f3a39 | 1021 | |
1022 | buffer_init(&m); | |
1023 | for (i = 0; i < 16; i++) | |
1024 | buffer_put_char(&m, session_id[i]); | |
1025 | ||
1026 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); | |
1027 | buffer_free(&m); | |
1028 | } | |
1029 | ||
1030 | int | |
1031 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
1032 | { | |
1033 | Buffer m; | |
1034 | Key *key; | |
1035 | u_char *blob; | |
1036 | u_int blen; | |
bfe49944 | 1037 | int allowed = 0, have_forced = 0; |
826f3a39 | 1038 | |
44a053a3 | 1039 | debug3("%s entering", __func__); |
826f3a39 | 1040 | |
1041 | buffer_init(&m); | |
1042 | buffer_put_bignum2(&m, client_n); | |
1043 | ||
1044 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); | |
1045 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1046 | ||
1047 | allowed = buffer_get_int(&m); | |
1048 | ||
bfe49944 | 1049 | /* fake forced command */ |
1050 | auth_clear_options(); | |
1051 | have_forced = buffer_get_int(&m); | |
1052 | forced_command = have_forced ? xstrdup("true") : NULL; | |
1053 | ||
826f3a39 | 1054 | if (allowed && rkey != NULL) { |
1055 | blob = buffer_get_string(&m, &blen); | |
1056 | if ((key = key_from_blob(blob, blen)) == NULL) | |
44a053a3 | 1057 | fatal("%s: key_from_blob failed", __func__); |
826f3a39 | 1058 | *rkey = key; |
1059 | xfree(blob); | |
1060 | } | |
1061 | mm_send_debug(&m); | |
1062 | buffer_free(&m); | |
1063 | ||
1064 | return (allowed); | |
1065 | } | |
1066 | ||
1067 | BIGNUM * | |
1068 | mm_auth_rsa_generate_challenge(Key *key) | |
1069 | { | |
1070 | Buffer m; | |
1071 | BIGNUM *challenge; | |
1072 | u_char *blob; | |
1073 | u_int blen; | |
1074 | ||
44a053a3 | 1075 | debug3("%s entering", __func__); |
826f3a39 | 1076 | |
1077 | if ((challenge = BN_new()) == NULL) | |
44a053a3 | 1078 | fatal("%s: BN_new failed", __func__); |
826f3a39 | 1079 | |
1080 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1081 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 1082 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 1083 | key->type = KEY_RSA1; |
1084 | ||
1085 | buffer_init(&m); | |
1086 | buffer_put_string(&m, blob, blen); | |
1087 | xfree(blob); | |
1088 | ||
1089 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); | |
1090 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1091 | ||
1092 | buffer_get_bignum2(&m, challenge); | |
1093 | buffer_free(&m); | |
1094 | ||
1095 | return (challenge); | |
1096 | } | |
1097 | ||
1098 | int | |
1099 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
1100 | { | |
1101 | Buffer m; | |
1102 | u_char *blob; | |
1103 | u_int blen; | |
1104 | int success = 0; | |
1105 | ||
44a053a3 | 1106 | debug3("%s entering", __func__); |
826f3a39 | 1107 | |
1108 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1109 | if (key_to_blob(key, &blob, &blen) == 0) | |
44a053a3 | 1110 | fatal("%s: key_to_blob failed", __func__); |
826f3a39 | 1111 | key->type = KEY_RSA1; |
1112 | ||
1113 | buffer_init(&m); | |
1114 | buffer_put_string(&m, blob, blen); | |
1115 | buffer_put_string(&m, response, 16); | |
1116 | xfree(blob); | |
1117 | ||
1118 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); | |
1119 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1120 | ||
1121 | success = buffer_get_int(&m); | |
1122 | buffer_free(&m); | |
1123 | ||
1124 | return (success); | |
1125 | } | |
23987cb8 | 1126 | |
dfddba3d | 1127 | #ifdef SSH_AUDIT_EVENTS |
1128 | void | |
1129 | mm_audit_event(ssh_audit_event_t event) | |
1130 | { | |
1131 | Buffer m; | |
1132 | ||
1133 | debug3("%s entering", __func__); | |
1134 | ||
1135 | buffer_init(&m); | |
1136 | buffer_put_int(&m, event); | |
1137 | ||
1138 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); | |
1139 | buffer_free(&m); | |
1140 | } | |
1141 | ||
1142 | void | |
1143 | mm_audit_run_command(const char *command) | |
1144 | { | |
1145 | Buffer m; | |
1146 | ||
1147 | debug3("%s entering command %s", __func__, command); | |
1148 | ||
1149 | buffer_init(&m); | |
1150 | buffer_put_cstring(&m, command); | |
1151 | ||
1152 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); | |
1153 | buffer_free(&m); | |
1154 | } | |
1155 | #endif /* SSH_AUDIT_EVENTS */ | |
1156 | ||
7cac2b65 | 1157 | #ifdef GSSAPI |
1158 | OM_uint32 | |
7e82606e | 1159 | mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) |
23987cb8 | 1160 | { |
7cac2b65 | 1161 | Buffer m; |
1162 | OM_uint32 major; | |
23987cb8 | 1163 | |
7cac2b65 | 1164 | /* Client doesn't get to see the context */ |
1165 | *ctx = NULL; | |
23987cb8 | 1166 | |
1167 | buffer_init(&m); | |
7e82606e | 1168 | buffer_put_string(&m, goid->elements, goid->length); |
23987cb8 | 1169 | |
7cac2b65 | 1170 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); |
1171 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); | |
1172 | ||
1173 | major = buffer_get_int(&m); | |
23987cb8 | 1174 | |
23987cb8 | 1175 | buffer_free(&m); |
7cac2b65 | 1176 | return (major); |
23987cb8 | 1177 | } |
23987cb8 | 1178 | |
7cac2b65 | 1179 | OM_uint32 |
1180 | mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, | |
1181 | gss_buffer_desc *out, OM_uint32 *flags) | |
23987cb8 | 1182 | { |
23987cb8 | 1183 | Buffer m; |
7cac2b65 | 1184 | OM_uint32 major; |
1185 | u_int len; | |
23987cb8 | 1186 | |
1187 | buffer_init(&m); | |
7cac2b65 | 1188 | buffer_put_string(&m, in->value, in->length); |
23987cb8 | 1189 | |
7cac2b65 | 1190 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); |
1191 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); | |
23987cb8 | 1192 | |
7cac2b65 | 1193 | major = buffer_get_int(&m); |
1194 | out->value = buffer_get_string(&m, &len); | |
1195 | out->length = len; | |
1196 | if (flags) | |
1197 | *flags = buffer_get_int(&m); | |
23987cb8 | 1198 | |
1199 | buffer_free(&m); | |
b59afbfe | 1200 | |
7cac2b65 | 1201 | return (major); |
b59afbfe | 1202 | } |
1203 | ||
540d72c3 | 1204 | OM_uint32 |
1205 | mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) | |
1206 | { | |
1207 | Buffer m; | |
1208 | OM_uint32 major; | |
1209 | ||
1210 | buffer_init(&m); | |
1211 | buffer_put_string(&m, gssbuf->value, gssbuf->length); | |
1212 | buffer_put_string(&m, gssmic->value, gssmic->length); | |
1213 | ||
1214 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); | |
1215 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, | |
1216 | &m); | |
1217 | ||
1218 | major = buffer_get_int(&m); | |
1219 | buffer_free(&m); | |
1220 | return(major); | |
1221 | } | |
1222 | ||
7cac2b65 | 1223 | int |
1224 | mm_ssh_gssapi_userok(char *user) | |
1225 | { | |
1226 | Buffer m; | |
1227 | int authenticated = 0; | |
b59afbfe | 1228 | |
7cac2b65 | 1229 | buffer_init(&m); |
b59afbfe | 1230 | |
7cac2b65 | 1231 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); |
1232 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, | |
1233 | &m); | |
b59afbfe | 1234 | |
7cac2b65 | 1235 | authenticated = buffer_get_int(&m); |
b59afbfe | 1236 | |
23987cb8 | 1237 | buffer_free(&m); |
7cac2b65 | 1238 | debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); |
1239 | return (authenticated); | |
b59afbfe | 1240 | } |
1241 | ||
b59afbfe | 1242 | OM_uint32 |
fe4ad273 | 1243 | mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) |
1244 | { | |
1245 | Buffer m; | |
1246 | OM_uint32 major; | |
77e22b94 | 1247 | u_int len; |
b59afbfe | 1248 | |
fe4ad273 | 1249 | buffer_init(&m); |
1250 | buffer_put_string(&m, data->value, data->length); | |
b59afbfe | 1251 | |
fe4ad273 | 1252 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m); |
1253 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m); | |
23987cb8 | 1254 | |
fe4ad273 | 1255 | major = buffer_get_int(&m); |
1256 | hash->value = buffer_get_string(&m, &len); | |
77e22b94 | 1257 | hash->length = len; |
b59afbfe | 1258 | |
23987cb8 | 1259 | buffer_free(&m); |
fe4ad273 | 1260 | |
1261 | return(major); | |
b59afbfe | 1262 | } |
9eeaa28e | 1263 | |
23987cb8 | 1264 | char * |
1265 | mm_ssh_gssapi_last_error(Gssctxt *ctx, OM_uint32 *major, OM_uint32 *minor) { | |
1266 | Buffer m; | |
1267 | OM_uint32 maj,min; | |
1268 | char *errstr; | |
1269 | ||
1270 | buffer_init(&m); | |
1271 | ||
1272 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSERR, &m); | |
1273 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSERR, &m); | |
1274 | ||
1275 | maj = buffer_get_int(&m); | |
1276 | min = buffer_get_int(&m); | |
1277 | ||
1278 | if (major) *major=maj; | |
1279 | if (minor) *minor=min; | |
1280 | ||
1281 | errstr=buffer_get_string(&m,NULL); | |
1282 | ||
1283 | buffer_free(&m); | |
1284 | ||
1285 | return(errstr); | |
1286 | } | |
e23e524c | 1287 | |
9eeaa28e | 1288 | OM_uint32 |
1289 | mm_gss_indicate_mechs(OM_uint32 *minor_status, gss_OID_set *mech_set) | |
1290 | { | |
1291 | Buffer m; | |
e23e524c | 1292 | OM_uint32 major,minor; |
1293 | int count; | |
1294 | gss_OID_desc oid; | |
d7590ddf | 1295 | u_int length; |
1296 | ||
9eeaa28e | 1297 | buffer_init(&m); |
1298 | ||
1299 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSMECHS, &m); | |
9eeaa28e | 1300 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSMECHS, |
1301 | &m); | |
1302 | major=buffer_get_int(&m); | |
17a7ea48 | 1303 | count=buffer_get_int(&m); |
e23e524c | 1304 | |
1305 | gss_create_empty_oid_set(&minor,mech_set); | |
1306 | while(count-->0) { | |
e23e524c | 1307 | oid.elements=buffer_get_string(&m,&length); |
1308 | oid.length=length; | |
1309 | gss_add_oid_set_member(&minor,&oid,mech_set); | |
9eeaa28e | 1310 | } |
1311 | ||
23987cb8 | 1312 | buffer_free(&m); |
9eeaa28e | 1313 | |
23987cb8 | 1314 | return(major); |
9eeaa28e | 1315 | } |
e23e524c | 1316 | |
1317 | int | |
1318 | mm_ssh_gssapi_localname(char **lname) | |
1319 | { | |
1320 | Buffer m; | |
1321 | ||
1322 | buffer_init(&m); | |
1323 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSLOCALNAME, &m); | |
1324 | ||
1325 | debug3("%s: waiting for MONITOR_ANS_GSSLOCALNAME", __func__); | |
1326 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSLOCALNAME, | |
1327 | &m); | |
1328 | ||
1329 | *lname = buffer_get_string(&m, NULL); | |
1330 | ||
1331 | buffer_free(&m); | |
1332 | if (lname[0] == '\0') { | |
1333 | debug3("%s: gssapi identity mapping failed", __func__); | |
1334 | } else { | |
1335 | debug3("%s: gssapi identity mapped to %s", __func__, *lname); | |
1336 | } | |
1337 | ||
1338 | return(0); | |
1339 | } | |
fe4ad273 | 1340 | |
b59afbfe | 1341 | #endif /* GSSAPI */ |