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91d9cdd3 | 1 | /* $OpenBSD: monitor_wrap.c,v 1.64 2008/11/04 08:22:13 djm Exp $ */ |
700318f3 | 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" | |
9108f8d9 | 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> | |
700318f3 | 40 | |
41 | #include <openssl/bn.h> | |
42 | #include <openssl/dh.h> | |
91d9cdd3 | 43 | #include <openssl/evp.h> |
700318f3 | 44 | |
22616013 | 45 | #include "openbsd-compat/sys-queue.h" |
9108f8d9 | 46 | #include "xmalloc.h" |
700318f3 | 47 | #include "ssh.h" |
48 | #include "dh.h" | |
9108f8d9 | 49 | #include "buffer.h" |
50 | #include "key.h" | |
51 | #include "cipher.h" | |
700318f3 | 52 | #include "kex.h" |
9108f8d9 | 53 | #include "hostfile.h" |
700318f3 | 54 | #include "auth.h" |
6a9b3198 | 55 | #include "auth-options.h" |
700318f3 | 56 | #include "packet.h" |
57 | #include "mac.h" | |
58 | #include "log.h" | |
99be0775 | 59 | #ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */ |
60 | #undef TARGET_OS_MAC | |
700318f3 | 61 | #include "zlib.h" |
99be0775 | 62 | #define TARGET_OS_MAC 1 |
63 | #else | |
64 | #include "zlib.h" | |
65 | #endif | |
700318f3 | 66 | #include "monitor.h" |
9108f8d9 | 67 | #ifdef GSSAPI |
68 | #include "ssh-gss.h" | |
69 | #endif | |
700318f3 | 70 | #include "monitor_wrap.h" |
700318f3 | 71 | #include "atomicio.h" |
72 | #include "monitor_fdpass.h" | |
9108f8d9 | 73 | #include "misc.h" |
91d9cdd3 | 74 | #include "jpake.h" |
700318f3 | 75 | |
700318f3 | 76 | #include "channels.h" |
77 | #include "session.h" | |
799ae497 | 78 | #include "servconf.h" |
700318f3 | 79 | |
80 | /* Imports */ | |
81 | extern int compat20; | |
82 | extern Newkeys *newkeys[]; | |
83 | extern z_stream incoming_stream; | |
84 | extern z_stream outgoing_stream; | |
85 | extern struct monitor *pmonitor; | |
86 | extern Buffer input, output; | |
c9f39d2c | 87 | extern Buffer loginmsg; |
0fff78ff | 88 | extern ServerOptions options; |
700318f3 | 89 | |
cdd66111 | 90 | int |
91 | mm_is_monitor(void) | |
92 | { | |
93 | /* | |
94 | * m_pid is only set in the privileged part, and | |
95 | * points to the unprivileged child. | |
96 | */ | |
97 | return (pmonitor && pmonitor->m_pid > 0); | |
98 | } | |
99 | ||
700318f3 | 100 | void |
c9f39d2c | 101 | mm_request_send(int sock, enum monitor_reqtype type, Buffer *m) |
700318f3 | 102 | { |
700318f3 | 103 | u_int mlen = buffer_len(m); |
41b2f314 | 104 | u_char buf[5]; |
700318f3 | 105 | |
f5799ae1 | 106 | debug3("%s entering: type %d", __func__, type); |
700318f3 | 107 | |
9108f8d9 | 108 | put_u32(buf, mlen + 1); |
f5799ae1 | 109 | buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */ |
c9f39d2c | 110 | if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf)) |
665a873d | 111 | fatal("%s: write: %s", __func__, strerror(errno)); |
c9f39d2c | 112 | if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen) |
665a873d | 113 | fatal("%s: write: %s", __func__, strerror(errno)); |
700318f3 | 114 | } |
115 | ||
116 | void | |
c9f39d2c | 117 | mm_request_receive(int sock, Buffer *m) |
700318f3 | 118 | { |
119 | u_char buf[4]; | |
700318f3 | 120 | u_int msg_len; |
121 | ||
f5799ae1 | 122 | debug3("%s entering", __func__); |
700318f3 | 123 | |
665a873d | 124 | if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) { |
125 | if (errno == EPIPE) | |
cdd66111 | 126 | cleanup_exit(255); |
665a873d | 127 | fatal("%s: read: %s", __func__, strerror(errno)); |
700318f3 | 128 | } |
9108f8d9 | 129 | msg_len = get_u32(buf); |
700318f3 | 130 | if (msg_len > 256 * 1024) |
f5799ae1 | 131 | fatal("%s: read: bad msg_len %d", __func__, msg_len); |
700318f3 | 132 | buffer_clear(m); |
133 | buffer_append_space(m, msg_len); | |
665a873d | 134 | if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len) |
135 | fatal("%s: read: %s", __func__, strerror(errno)); | |
700318f3 | 136 | } |
137 | ||
138 | void | |
c9f39d2c | 139 | mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m) |
700318f3 | 140 | { |
141 | u_char rtype; | |
142 | ||
f5799ae1 | 143 | debug3("%s entering: type %d", __func__, type); |
700318f3 | 144 | |
c9f39d2c | 145 | mm_request_receive(sock, m); |
700318f3 | 146 | rtype = buffer_get_char(m); |
147 | if (rtype != type) | |
f5799ae1 | 148 | fatal("%s: read: rtype %d != type %d", __func__, |
700318f3 | 149 | rtype, type); |
150 | } | |
151 | ||
152 | DH * | |
153 | mm_choose_dh(int min, int nbits, int max) | |
154 | { | |
155 | BIGNUM *p, *g; | |
156 | int success = 0; | |
157 | Buffer m; | |
158 | ||
159 | buffer_init(&m); | |
160 | buffer_put_int(&m, min); | |
161 | buffer_put_int(&m, nbits); | |
162 | buffer_put_int(&m, max); | |
163 | ||
164 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m); | |
165 | ||
f5799ae1 | 166 | debug3("%s: waiting for MONITOR_ANS_MODULI", __func__); |
700318f3 | 167 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m); |
168 | ||
169 | success = buffer_get_char(&m); | |
170 | if (success == 0) | |
f5799ae1 | 171 | fatal("%s: MONITOR_ANS_MODULI failed", __func__); |
700318f3 | 172 | |
173 | if ((p = BN_new()) == NULL) | |
f5799ae1 | 174 | fatal("%s: BN_new failed", __func__); |
700318f3 | 175 | if ((g = BN_new()) == NULL) |
f5799ae1 | 176 | fatal("%s: BN_new failed", __func__); |
700318f3 | 177 | buffer_get_bignum2(&m, p); |
178 | buffer_get_bignum2(&m, g); | |
179 | ||
f5799ae1 | 180 | debug3("%s: remaining %d", __func__, buffer_len(&m)); |
700318f3 | 181 | buffer_free(&m); |
182 | ||
183 | return (dh_new_group(g, p)); | |
184 | } | |
185 | ||
186 | int | |
187 | mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen) | |
188 | { | |
189 | Kex *kex = *pmonitor->m_pkex; | |
190 | Buffer m; | |
191 | ||
f5799ae1 | 192 | debug3("%s entering", __func__); |
700318f3 | 193 | |
194 | buffer_init(&m); | |
195 | buffer_put_int(&m, kex->host_key_index(key)); | |
196 | buffer_put_string(&m, data, datalen); | |
197 | ||
198 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m); | |
199 | ||
f5799ae1 | 200 | debug3("%s: waiting for MONITOR_ANS_SIGN", __func__); |
700318f3 | 201 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m); |
202 | *sigp = buffer_get_string(&m, lenp); | |
203 | buffer_free(&m); | |
204 | ||
205 | return (0); | |
206 | } | |
207 | ||
208 | struct passwd * | |
c9f39d2c | 209 | mm_getpwnamallow(const char *username) |
700318f3 | 210 | { |
211 | Buffer m; | |
212 | struct passwd *pw; | |
799ae497 | 213 | u_int len; |
214 | ServerOptions *newopts; | |
700318f3 | 215 | |
f5799ae1 | 216 | debug3("%s entering", __func__); |
700318f3 | 217 | |
218 | buffer_init(&m); | |
c9f39d2c | 219 | buffer_put_cstring(&m, username); |
700318f3 | 220 | |
221 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m); | |
222 | ||
f5799ae1 | 223 | debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__); |
700318f3 | 224 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m); |
225 | ||
226 | if (buffer_get_char(&m) == 0) { | |
47686178 | 227 | pw = NULL; |
228 | goto out; | |
700318f3 | 229 | } |
799ae497 | 230 | pw = buffer_get_string(&m, &len); |
231 | if (len != sizeof(struct passwd)) | |
f5799ae1 | 232 | fatal("%s: struct passwd size mismatch", __func__); |
700318f3 | 233 | pw->pw_name = buffer_get_string(&m, NULL); |
234 | pw->pw_passwd = buffer_get_string(&m, NULL); | |
235 | pw->pw_gecos = buffer_get_string(&m, NULL); | |
236 | #ifdef HAVE_PW_CLASS_IN_PASSWD | |
237 | pw->pw_class = buffer_get_string(&m, NULL); | |
238 | #endif | |
239 | pw->pw_dir = buffer_get_string(&m, NULL); | |
240 | pw->pw_shell = buffer_get_string(&m, NULL); | |
799ae497 | 241 | |
47686178 | 242 | out: |
799ae497 | 243 | /* copy options block as a Match directive may have changed some */ |
244 | newopts = buffer_get_string(&m, &len); | |
245 | if (len != sizeof(*newopts)) | |
246 | fatal("%s: option block size mismatch", __func__); | |
247 | if (newopts->banner != NULL) | |
248 | newopts->banner = buffer_get_string(&m, NULL); | |
249 | copy_set_server_options(&options, newopts, 1); | |
250 | xfree(newopts); | |
251 | ||
700318f3 | 252 | buffer_free(&m); |
253 | ||
254 | return (pw); | |
255 | } | |
256 | ||
cdd66111 | 257 | char * |
258 | mm_auth2_read_banner(void) | |
700318f3 | 259 | { |
260 | Buffer m; | |
261 | char *banner; | |
262 | ||
f5799ae1 | 263 | debug3("%s entering", __func__); |
700318f3 | 264 | |
265 | buffer_init(&m); | |
266 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m); | |
267 | buffer_clear(&m); | |
268 | ||
cdd66111 | 269 | mm_request_receive_expect(pmonitor->m_recvfd, |
270 | MONITOR_ANS_AUTH2_READ_BANNER, &m); | |
700318f3 | 271 | banner = buffer_get_string(&m, NULL); |
272 | buffer_free(&m); | |
f5799ae1 | 273 | |
cdd66111 | 274 | /* treat empty banner as missing banner */ |
275 | if (strlen(banner) == 0) { | |
276 | xfree(banner); | |
277 | banner = NULL; | |
278 | } | |
700318f3 | 279 | return (banner); |
280 | } | |
281 | ||
282 | /* Inform the privileged process about service and style */ | |
283 | ||
284 | void | |
285 | mm_inform_authserv(char *service, char *style) | |
286 | { | |
287 | Buffer m; | |
288 | ||
f5799ae1 | 289 | debug3("%s entering", __func__); |
700318f3 | 290 | |
291 | buffer_init(&m); | |
292 | buffer_put_cstring(&m, service); | |
293 | buffer_put_cstring(&m, style ? style : ""); | |
294 | ||
295 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m); | |
296 | ||
297 | buffer_free(&m); | |
298 | } | |
299 | ||
300 | /* Do the password authentication */ | |
301 | int | |
302 | mm_auth_password(Authctxt *authctxt, char *password) | |
303 | { | |
304 | Buffer m; | |
305 | int authenticated = 0; | |
306 | ||
f5799ae1 | 307 | debug3("%s entering", __func__); |
700318f3 | 308 | |
309 | buffer_init(&m); | |
310 | buffer_put_cstring(&m, password); | |
311 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m); | |
312 | ||
f5799ae1 | 313 | debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__); |
700318f3 | 314 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m); |
315 | ||
316 | authenticated = buffer_get_int(&m); | |
317 | ||
318 | buffer_free(&m); | |
319 | ||
320 | debug3("%s: user %sauthenticated", | |
f5799ae1 | 321 | __func__, authenticated ? "" : "not "); |
700318f3 | 322 | return (authenticated); |
323 | } | |
324 | ||
325 | int | |
326 | mm_user_key_allowed(struct passwd *pw, Key *key) | |
327 | { | |
328 | return (mm_key_allowed(MM_USERKEY, NULL, NULL, key)); | |
329 | } | |
330 | ||
331 | int | |
332 | mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host, | |
333 | Key *key) | |
334 | { | |
335 | return (mm_key_allowed(MM_HOSTKEY, user, host, key)); | |
336 | } | |
337 | ||
338 | int | |
339 | mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user, | |
340 | char *host, Key *key) | |
341 | { | |
342 | int ret; | |
343 | ||
344 | key->type = KEY_RSA; /* XXX hack for key_to_blob */ | |
345 | ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key); | |
346 | key->type = KEY_RSA1; | |
347 | return (ret); | |
348 | } | |
349 | ||
350 | static void | |
351 | mm_send_debug(Buffer *m) | |
352 | { | |
353 | char *msg; | |
354 | ||
355 | while (buffer_len(m)) { | |
356 | msg = buffer_get_string(m, NULL); | |
f5799ae1 | 357 | debug3("%s: Sending debug: %s", __func__, msg); |
700318f3 | 358 | packet_send_debug("%s", msg); |
359 | xfree(msg); | |
360 | } | |
361 | } | |
362 | ||
363 | int | |
364 | mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key) | |
365 | { | |
366 | Buffer m; | |
367 | u_char *blob; | |
368 | u_int len; | |
6a9b3198 | 369 | int allowed = 0, have_forced = 0; |
700318f3 | 370 | |
f5799ae1 | 371 | debug3("%s entering", __func__); |
700318f3 | 372 | |
373 | /* Convert the key to a blob and the pass it over */ | |
374 | if (!key_to_blob(key, &blob, &len)) | |
375 | return (0); | |
376 | ||
377 | buffer_init(&m); | |
378 | buffer_put_int(&m, type); | |
379 | buffer_put_cstring(&m, user ? user : ""); | |
380 | buffer_put_cstring(&m, host ? host : ""); | |
381 | buffer_put_string(&m, blob, len); | |
382 | xfree(blob); | |
383 | ||
384 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m); | |
385 | ||
f5799ae1 | 386 | debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__); |
700318f3 | 387 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m); |
388 | ||
389 | allowed = buffer_get_int(&m); | |
390 | ||
6a9b3198 | 391 | /* fake forced command */ |
392 | auth_clear_options(); | |
393 | have_forced = buffer_get_int(&m); | |
394 | forced_command = have_forced ? xstrdup("true") : NULL; | |
395 | ||
700318f3 | 396 | /* Send potential debug messages */ |
397 | mm_send_debug(&m); | |
398 | ||
399 | buffer_free(&m); | |
400 | ||
401 | return (allowed); | |
402 | } | |
403 | ||
404 | /* | |
405 | * This key verify needs to send the key type along, because the | |
406 | * privileged parent makes the decision if the key is allowed | |
407 | * for authentication. | |
408 | */ | |
409 | ||
410 | int | |
411 | mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen) | |
412 | { | |
413 | Buffer m; | |
414 | u_char *blob; | |
415 | u_int len; | |
416 | int verified = 0; | |
417 | ||
f5799ae1 | 418 | debug3("%s entering", __func__); |
700318f3 | 419 | |
420 | /* Convert the key to a blob and the pass it over */ | |
421 | if (!key_to_blob(key, &blob, &len)) | |
422 | return (0); | |
423 | ||
424 | buffer_init(&m); | |
425 | buffer_put_string(&m, blob, len); | |
426 | buffer_put_string(&m, sig, siglen); | |
427 | buffer_put_string(&m, data, datalen); | |
428 | xfree(blob); | |
429 | ||
430 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m); | |
431 | ||
f5799ae1 | 432 | debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__); |
700318f3 | 433 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m); |
434 | ||
435 | verified = buffer_get_int(&m); | |
436 | ||
437 | buffer_free(&m); | |
438 | ||
439 | return (verified); | |
440 | } | |
441 | ||
442 | /* Export key state after authentication */ | |
443 | Newkeys * | |
444 | mm_newkeys_from_blob(u_char *blob, int blen) | |
445 | { | |
446 | Buffer b; | |
447 | u_int len; | |
448 | Newkeys *newkey = NULL; | |
449 | Enc *enc; | |
450 | Mac *mac; | |
451 | Comp *comp; | |
452 | ||
f5799ae1 | 453 | debug3("%s: %p(%d)", __func__, blob, blen); |
700318f3 | 454 | #ifdef DEBUG_PK |
455 | dump_base64(stderr, blob, blen); | |
456 | #endif | |
457 | buffer_init(&b); | |
458 | buffer_append(&b, blob, blen); | |
459 | ||
460 | newkey = xmalloc(sizeof(*newkey)); | |
461 | enc = &newkey->enc; | |
462 | mac = &newkey->mac; | |
463 | comp = &newkey->comp; | |
464 | ||
465 | /* Enc structure */ | |
466 | enc->name = buffer_get_string(&b, NULL); | |
467 | buffer_get(&b, &enc->cipher, sizeof(enc->cipher)); | |
468 | enc->enabled = buffer_get_int(&b); | |
469 | enc->block_size = buffer_get_int(&b); | |
470 | enc->key = buffer_get_string(&b, &enc->key_len); | |
471 | enc->iv = buffer_get_string(&b, &len); | |
472 | if (len != enc->block_size) | |
41b2f314 | 473 | fatal("%s: bad ivlen: expected %u != %u", __func__, |
700318f3 | 474 | enc->block_size, len); |
475 | ||
476 | if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher) | |
f5799ae1 | 477 | fatal("%s: bad cipher name %s or pointer %p", __func__, |
700318f3 | 478 | enc->name, enc->cipher); |
479 | ||
480 | /* Mac structure */ | |
481 | mac->name = buffer_get_string(&b, NULL); | |
d4487008 | 482 | if (mac->name == NULL || mac_setup(mac, mac->name) == -1) |
483 | fatal("%s: can not setup mac %s", __func__, mac->name); | |
700318f3 | 484 | mac->enabled = buffer_get_int(&b); |
485 | mac->key = buffer_get_string(&b, &len); | |
486 | if (len > mac->key_len) | |
41b2f314 | 487 | fatal("%s: bad mac key length: %u > %d", __func__, len, |
700318f3 | 488 | mac->key_len); |
489 | mac->key_len = len; | |
490 | ||
491 | /* Comp structure */ | |
492 | comp->type = buffer_get_int(&b); | |
493 | comp->enabled = buffer_get_int(&b); | |
494 | comp->name = buffer_get_string(&b, NULL); | |
495 | ||
496 | len = buffer_len(&b); | |
497 | if (len != 0) | |
41b2f314 | 498 | error("newkeys_from_blob: remaining bytes in blob %u", len); |
700318f3 | 499 | buffer_free(&b); |
500 | return (newkey); | |
501 | } | |
502 | ||
503 | int | |
504 | mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp) | |
505 | { | |
506 | Buffer b; | |
507 | int len; | |
700318f3 | 508 | Enc *enc; |
509 | Mac *mac; | |
510 | Comp *comp; | |
511 | Newkeys *newkey = newkeys[mode]; | |
512 | ||
f5799ae1 | 513 | debug3("%s: converting %p", __func__, newkey); |
700318f3 | 514 | |
515 | if (newkey == NULL) { | |
f5799ae1 | 516 | error("%s: newkey == NULL", __func__); |
700318f3 | 517 | return 0; |
518 | } | |
519 | enc = &newkey->enc; | |
520 | mac = &newkey->mac; | |
521 | comp = &newkey->comp; | |
522 | ||
523 | buffer_init(&b); | |
524 | /* Enc structure */ | |
525 | buffer_put_cstring(&b, enc->name); | |
526 | /* The cipher struct is constant and shared, you export pointer */ | |
527 | buffer_append(&b, &enc->cipher, sizeof(enc->cipher)); | |
528 | buffer_put_int(&b, enc->enabled); | |
529 | buffer_put_int(&b, enc->block_size); | |
530 | buffer_put_string(&b, enc->key, enc->key_len); | |
531 | packet_get_keyiv(mode, enc->iv, enc->block_size); | |
532 | buffer_put_string(&b, enc->iv, enc->block_size); | |
533 | ||
534 | /* Mac structure */ | |
535 | buffer_put_cstring(&b, mac->name); | |
536 | buffer_put_int(&b, mac->enabled); | |
537 | buffer_put_string(&b, mac->key, mac->key_len); | |
538 | ||
539 | /* Comp structure */ | |
540 | buffer_put_int(&b, comp->type); | |
541 | buffer_put_int(&b, comp->enabled); | |
542 | buffer_put_cstring(&b, comp->name); | |
543 | ||
544 | len = buffer_len(&b); | |
700318f3 | 545 | if (lenp != NULL) |
546 | *lenp = len; | |
41b2f314 | 547 | if (blobp != NULL) { |
548 | *blobp = xmalloc(len); | |
549 | memcpy(*blobp, buffer_ptr(&b), len); | |
550 | } | |
551 | memset(buffer_ptr(&b), 0, len); | |
552 | buffer_free(&b); | |
700318f3 | 553 | return len; |
554 | } | |
555 | ||
556 | static void | |
557 | mm_send_kex(Buffer *m, Kex *kex) | |
558 | { | |
559 | buffer_put_string(m, kex->session_id, kex->session_id_len); | |
560 | buffer_put_int(m, kex->we_need); | |
561 | buffer_put_int(m, kex->hostkey_type); | |
562 | buffer_put_int(m, kex->kex_type); | |
563 | buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my)); | |
564 | buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer)); | |
565 | buffer_put_int(m, kex->flags); | |
566 | buffer_put_cstring(m, kex->client_version_string); | |
567 | buffer_put_cstring(m, kex->server_version_string); | |
568 | } | |
569 | ||
570 | void | |
c9f39d2c | 571 | mm_send_keystate(struct monitor *monitor) |
700318f3 | 572 | { |
573 | Buffer m; | |
574 | u_char *blob, *p; | |
575 | u_int bloblen, plen; | |
0fff78ff | 576 | u_int32_t seqnr, packets; |
22616013 | 577 | u_int64_t blocks, bytes; |
700318f3 | 578 | |
579 | buffer_init(&m); | |
580 | ||
581 | if (!compat20) { | |
582 | u_char iv[24]; | |
f5799ae1 | 583 | u_char *key; |
584 | u_int ivlen, keylen; | |
700318f3 | 585 | |
586 | buffer_put_int(&m, packet_get_protocol_flags()); | |
587 | ||
588 | buffer_put_int(&m, packet_get_ssh1_cipher()); | |
589 | ||
f5799ae1 | 590 | debug3("%s: Sending ssh1 KEY+IV", __func__); |
591 | keylen = packet_get_encryption_key(NULL); | |
592 | key = xmalloc(keylen+1); /* add 1 if keylen == 0 */ | |
593 | keylen = packet_get_encryption_key(key); | |
594 | buffer_put_string(&m, key, keylen); | |
595 | memset(key, 0, keylen); | |
596 | xfree(key); | |
597 | ||
700318f3 | 598 | ivlen = packet_get_keyiv_len(MODE_OUT); |
599 | packet_get_keyiv(MODE_OUT, iv, ivlen); | |
600 | buffer_put_string(&m, iv, ivlen); | |
601 | ivlen = packet_get_keyiv_len(MODE_OUT); | |
602 | packet_get_keyiv(MODE_IN, iv, ivlen); | |
603 | buffer_put_string(&m, iv, ivlen); | |
604 | goto skip; | |
605 | } else { | |
606 | /* Kex for rekeying */ | |
c9f39d2c | 607 | mm_send_kex(&m, *monitor->m_pkex); |
700318f3 | 608 | } |
609 | ||
610 | debug3("%s: Sending new keys: %p %p", | |
f5799ae1 | 611 | __func__, newkeys[MODE_OUT], newkeys[MODE_IN]); |
700318f3 | 612 | |
613 | /* Keys from Kex */ | |
614 | if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen)) | |
f5799ae1 | 615 | fatal("%s: conversion of newkeys failed", __func__); |
700318f3 | 616 | |
617 | buffer_put_string(&m, blob, bloblen); | |
618 | xfree(blob); | |
619 | ||
620 | if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen)) | |
f5799ae1 | 621 | fatal("%s: conversion of newkeys failed", __func__); |
700318f3 | 622 | |
623 | buffer_put_string(&m, blob, bloblen); | |
624 | xfree(blob); | |
625 | ||
22616013 | 626 | packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes); |
0fff78ff | 627 | buffer_put_int(&m, seqnr); |
628 | buffer_put_int64(&m, blocks); | |
629 | buffer_put_int(&m, packets); | |
22616013 | 630 | buffer_put_int64(&m, bytes); |
631 | packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes); | |
0fff78ff | 632 | buffer_put_int(&m, seqnr); |
633 | buffer_put_int64(&m, blocks); | |
634 | buffer_put_int(&m, packets); | |
22616013 | 635 | buffer_put_int64(&m, bytes); |
700318f3 | 636 | |
f5799ae1 | 637 | debug3("%s: New keys have been sent", __func__); |
700318f3 | 638 | skip: |
639 | /* More key context */ | |
640 | plen = packet_get_keycontext(MODE_OUT, NULL); | |
641 | p = xmalloc(plen+1); | |
642 | packet_get_keycontext(MODE_OUT, p); | |
643 | buffer_put_string(&m, p, plen); | |
644 | xfree(p); | |
645 | ||
646 | plen = packet_get_keycontext(MODE_IN, NULL); | |
647 | p = xmalloc(plen+1); | |
648 | packet_get_keycontext(MODE_IN, p); | |
649 | buffer_put_string(&m, p, plen); | |
650 | xfree(p); | |
651 | ||
652 | /* Compression state */ | |
f5799ae1 | 653 | debug3("%s: Sending compression state", __func__); |
700318f3 | 654 | buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream)); |
655 | buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream)); | |
656 | ||
657 | /* Network I/O buffers */ | |
658 | buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input)); | |
659 | buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output)); | |
660 | ||
c9f39d2c | 661 | mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m); |
f5799ae1 | 662 | debug3("%s: Finished sending state", __func__); |
700318f3 | 663 | |
664 | buffer_free(&m); | |
665 | } | |
666 | ||
667 | int | |
9108f8d9 | 668 | mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, size_t namebuflen) |
700318f3 | 669 | { |
670 | Buffer m; | |
c9f39d2c | 671 | char *p, *msg; |
22616013 | 672 | int success = 0, tmp1 = -1, tmp2 = -1; |
673 | ||
674 | /* Kludge: ensure there are fds free to receive the pty/tty */ | |
675 | if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 || | |
676 | (tmp2 = dup(pmonitor->m_recvfd)) == -1) { | |
677 | error("%s: cannot allocate fds for pty", __func__); | |
678 | if (tmp1 > 0) | |
679 | close(tmp1); | |
680 | if (tmp2 > 0) | |
681 | close(tmp2); | |
682 | return 0; | |
683 | } | |
684 | close(tmp1); | |
685 | close(tmp2); | |
700318f3 | 686 | |
687 | buffer_init(&m); | |
688 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m); | |
689 | ||
f5799ae1 | 690 | debug3("%s: waiting for MONITOR_ANS_PTY", __func__); |
700318f3 | 691 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m); |
692 | ||
693 | success = buffer_get_int(&m); | |
694 | if (success == 0) { | |
f5799ae1 | 695 | debug3("%s: pty alloc failed", __func__); |
700318f3 | 696 | buffer_free(&m); |
697 | return (0); | |
698 | } | |
699 | p = buffer_get_string(&m, NULL); | |
c9f39d2c | 700 | msg = buffer_get_string(&m, NULL); |
700318f3 | 701 | buffer_free(&m); |
702 | ||
703 | strlcpy(namebuf, p, namebuflen); /* Possible truncation */ | |
704 | xfree(p); | |
705 | ||
c9f39d2c | 706 | buffer_append(&loginmsg, msg, strlen(msg)); |
707 | xfree(msg); | |
708 | ||
47686178 | 709 | if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 || |
710 | (*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1) | |
711 | fatal("%s: receive fds failed", __func__); | |
700318f3 | 712 | |
713 | /* Success */ | |
714 | return (1); | |
715 | } | |
716 | ||
717 | void | |
cdd66111 | 718 | mm_session_pty_cleanup2(Session *s) |
700318f3 | 719 | { |
700318f3 | 720 | Buffer m; |
721 | ||
722 | if (s->ttyfd == -1) | |
723 | return; | |
724 | buffer_init(&m); | |
725 | buffer_put_cstring(&m, s->tty); | |
726 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m); | |
727 | buffer_free(&m); | |
728 | ||
729 | /* closed dup'ed master */ | |
22616013 | 730 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
731 | error("close(s->ptymaster/%d): %s", | |
732 | s->ptymaster, strerror(errno)); | |
700318f3 | 733 | |
734 | /* unlink pty from session */ | |
735 | s->ttyfd = -1; | |
736 | } | |
737 | ||
738 | #ifdef USE_PAM | |
739 | void | |
99be0775 | 740 | mm_start_pam(Authctxt *authctxt) |
700318f3 | 741 | { |
742 | Buffer m; | |
743 | ||
f5799ae1 | 744 | debug3("%s entering", __func__); |
0fff78ff | 745 | if (!options.use_pam) |
746 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
700318f3 | 747 | |
748 | buffer_init(&m); | |
700318f3 | 749 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m); |
750 | ||
751 | buffer_free(&m); | |
752 | } | |
0fff78ff | 753 | |
754 | u_int | |
755 | mm_do_pam_account(void) | |
756 | { | |
757 | Buffer m; | |
758 | u_int ret; | |
996d5e62 | 759 | char *msg; |
0fff78ff | 760 | |
761 | debug3("%s entering", __func__); | |
762 | if (!options.use_pam) | |
763 | fatal("UsePAM=no, but ended up in %s anyway", __func__); | |
764 | ||
765 | buffer_init(&m); | |
766 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m); | |
767 | ||
cdd66111 | 768 | mm_request_receive_expect(pmonitor->m_recvfd, |
0fff78ff | 769 | MONITOR_ANS_PAM_ACCOUNT, &m); |
770 | ret = buffer_get_int(&m); | |
996d5e62 | 771 | msg = buffer_get_string(&m, NULL); |
772 | buffer_append(&loginmsg, msg, strlen(msg)); | |
773 | xfree(msg); | |
0fff78ff | 774 | |
775 | buffer_free(&m); | |
cdd66111 | 776 | |
0fff78ff | 777 | debug3("%s returning %d", __func__, ret); |
778 | ||
779 | return (ret); | |
780 | } | |
781 | ||
782 | void * | |
783 | mm_sshpam_init_ctx(Authctxt *authctxt) | |
784 | { | |
785 | Buffer m; | |
786 | int success; | |
787 | ||
788 | debug3("%s", __func__); | |
789 | buffer_init(&m); | |
790 | buffer_put_cstring(&m, authctxt->user); | |
791 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m); | |
792 | debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__); | |
793 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m); | |
794 | success = buffer_get_int(&m); | |
795 | if (success == 0) { | |
796 | debug3("%s: pam_init_ctx failed", __func__); | |
797 | buffer_free(&m); | |
798 | return (NULL); | |
799 | } | |
800 | buffer_free(&m); | |
801 | return (authctxt); | |
802 | } | |
803 | ||
804 | int | |
805 | mm_sshpam_query(void *ctx, char **name, char **info, | |
806 | u_int *num, char ***prompts, u_int **echo_on) | |
807 | { | |
808 | Buffer m; | |
665a873d | 809 | u_int i; |
810 | int ret; | |
0fff78ff | 811 | |
812 | debug3("%s", __func__); | |
813 | buffer_init(&m); | |
814 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m); | |
815 | debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__); | |
816 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m); | |
817 | ret = buffer_get_int(&m); | |
818 | debug3("%s: pam_query returned %d", __func__, ret); | |
819 | *name = buffer_get_string(&m, NULL); | |
820 | *info = buffer_get_string(&m, NULL); | |
821 | *num = buffer_get_int(&m); | |
9108f8d9 | 822 | if (*num > PAM_MAX_NUM_MSG) |
823 | fatal("%s: recieved %u PAM messages, expected <= %u", | |
824 | __func__, *num, PAM_MAX_NUM_MSG); | |
825 | *prompts = xcalloc((*num + 1), sizeof(char *)); | |
826 | *echo_on = xcalloc((*num + 1), sizeof(u_int)); | |
0fff78ff | 827 | for (i = 0; i < *num; ++i) { |
828 | (*prompts)[i] = buffer_get_string(&m, NULL); | |
829 | (*echo_on)[i] = buffer_get_int(&m); | |
830 | } | |
831 | buffer_free(&m); | |
832 | return (ret); | |
833 | } | |
834 | ||
835 | int | |
836 | mm_sshpam_respond(void *ctx, u_int num, char **resp) | |
837 | { | |
838 | Buffer m; | |
665a873d | 839 | u_int i; |
840 | int ret; | |
0fff78ff | 841 | |
842 | debug3("%s", __func__); | |
843 | buffer_init(&m); | |
844 | buffer_put_int(&m, num); | |
845 | for (i = 0; i < num; ++i) | |
846 | buffer_put_cstring(&m, resp[i]); | |
847 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m); | |
848 | debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__); | |
849 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m); | |
850 | ret = buffer_get_int(&m); | |
851 | debug3("%s: pam_respond returned %d", __func__, ret); | |
852 | buffer_free(&m); | |
853 | return (ret); | |
854 | } | |
855 | ||
856 | void | |
857 | mm_sshpam_free_ctx(void *ctxtp) | |
858 | { | |
859 | Buffer m; | |
860 | ||
861 | debug3("%s", __func__); | |
862 | buffer_init(&m); | |
863 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m); | |
864 | debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__); | |
865 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m); | |
866 | buffer_free(&m); | |
867 | } | |
700318f3 | 868 | #endif /* USE_PAM */ |
869 | ||
870 | /* Request process termination */ | |
871 | ||
872 | void | |
873 | mm_terminate(void) | |
874 | { | |
875 | Buffer m; | |
876 | ||
877 | buffer_init(&m); | |
878 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m); | |
879 | buffer_free(&m); | |
880 | } | |
881 | ||
882 | int | |
883 | mm_ssh1_session_key(BIGNUM *num) | |
884 | { | |
885 | int rsafail; | |
886 | Buffer m; | |
887 | ||
888 | buffer_init(&m); | |
889 | buffer_put_bignum2(&m, num); | |
890 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m); | |
891 | ||
892 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m); | |
893 | ||
894 | rsafail = buffer_get_int(&m); | |
895 | buffer_get_bignum2(&m, num); | |
896 | ||
897 | buffer_free(&m); | |
898 | ||
899 | return (rsafail); | |
900 | } | |
901 | ||
902 | static void | |
903 | mm_chall_setup(char **name, char **infotxt, u_int *numprompts, | |
904 | char ***prompts, u_int **echo_on) | |
905 | { | |
f5799ae1 | 906 | *name = xstrdup(""); |
907 | *infotxt = xstrdup(""); | |
700318f3 | 908 | *numprompts = 1; |
9108f8d9 | 909 | *prompts = xcalloc(*numprompts, sizeof(char *)); |
910 | *echo_on = xcalloc(*numprompts, sizeof(u_int)); | |
700318f3 | 911 | (*echo_on)[0] = 0; |
912 | } | |
913 | ||
914 | int | |
915 | mm_bsdauth_query(void *ctx, char **name, char **infotxt, | |
916 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
917 | { | |
918 | Buffer m; | |
6a9b3198 | 919 | u_int success; |
700318f3 | 920 | char *challenge; |
921 | ||
f5799ae1 | 922 | debug3("%s: entering", __func__); |
700318f3 | 923 | |
924 | buffer_init(&m); | |
925 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m); | |
926 | ||
927 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY, | |
928 | &m); | |
6a9b3198 | 929 | success = buffer_get_int(&m); |
930 | if (success == 0) { | |
f5799ae1 | 931 | debug3("%s: no challenge", __func__); |
700318f3 | 932 | buffer_free(&m); |
933 | return (-1); | |
934 | } | |
935 | ||
936 | /* Get the challenge, and format the response */ | |
937 | challenge = buffer_get_string(&m, NULL); | |
938 | buffer_free(&m); | |
939 | ||
940 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
941 | (*prompts)[0] = challenge; | |
942 | ||
f5799ae1 | 943 | debug3("%s: received challenge: %s", __func__, challenge); |
700318f3 | 944 | |
945 | return (0); | |
946 | } | |
947 | ||
948 | int | |
949 | mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses) | |
950 | { | |
951 | Buffer m; | |
952 | int authok; | |
953 | ||
f5799ae1 | 954 | debug3("%s: entering", __func__); |
700318f3 | 955 | if (numresponses != 1) |
956 | return (-1); | |
957 | ||
958 | buffer_init(&m); | |
959 | buffer_put_cstring(&m, responses[0]); | |
960 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m); | |
961 | ||
962 | mm_request_receive_expect(pmonitor->m_recvfd, | |
963 | MONITOR_ANS_BSDAUTHRESPOND, &m); | |
964 | ||
965 | authok = buffer_get_int(&m); | |
966 | buffer_free(&m); | |
967 | ||
968 | return ((authok == 0) ? -1 : 0); | |
969 | } | |
970 | ||
c9f39d2c | 971 | #ifdef SKEY |
700318f3 | 972 | int |
973 | mm_skey_query(void *ctx, char **name, char **infotxt, | |
974 | u_int *numprompts, char ***prompts, u_int **echo_on) | |
975 | { | |
976 | Buffer m; | |
6a9b3198 | 977 | u_int success; |
9108f8d9 | 978 | char *challenge; |
700318f3 | 979 | |
f5799ae1 | 980 | debug3("%s: entering", __func__); |
700318f3 | 981 | |
982 | buffer_init(&m); | |
983 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m); | |
984 | ||
985 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY, | |
986 | &m); | |
6a9b3198 | 987 | success = buffer_get_int(&m); |
988 | if (success == 0) { | |
f5799ae1 | 989 | debug3("%s: no challenge", __func__); |
700318f3 | 990 | buffer_free(&m); |
991 | return (-1); | |
992 | } | |
993 | ||
994 | /* Get the challenge, and format the response */ | |
995 | challenge = buffer_get_string(&m, NULL); | |
996 | buffer_free(&m); | |
997 | ||
f5799ae1 | 998 | debug3("%s: received challenge: %s", __func__, challenge); |
700318f3 | 999 | |
1000 | mm_chall_setup(name, infotxt, numprompts, prompts, echo_on); | |
1001 | ||
9108f8d9 | 1002 | xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT); |
700318f3 | 1003 | xfree(challenge); |
1004 | ||
1005 | return (0); | |
1006 | } | |
1007 | ||
1008 | int | |
1009 | mm_skey_respond(void *ctx, u_int numresponses, char **responses) | |
1010 | { | |
1011 | Buffer m; | |
1012 | int authok; | |
1013 | ||
f5799ae1 | 1014 | debug3("%s: entering", __func__); |
700318f3 | 1015 | if (numresponses != 1) |
1016 | return (-1); | |
1017 | ||
1018 | buffer_init(&m); | |
1019 | buffer_put_cstring(&m, responses[0]); | |
1020 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m); | |
1021 | ||
1022 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1023 | MONITOR_ANS_SKEYRESPOND, &m); | |
1024 | ||
1025 | authok = buffer_get_int(&m); | |
1026 | buffer_free(&m); | |
1027 | ||
1028 | return ((authok == 0) ? -1 : 0); | |
1029 | } | |
c9f39d2c | 1030 | #endif /* SKEY */ |
700318f3 | 1031 | |
1032 | void | |
1033 | mm_ssh1_session_id(u_char session_id[16]) | |
1034 | { | |
1035 | Buffer m; | |
1036 | int i; | |
1037 | ||
f5799ae1 | 1038 | debug3("%s entering", __func__); |
700318f3 | 1039 | |
1040 | buffer_init(&m); | |
1041 | for (i = 0; i < 16; i++) | |
1042 | buffer_put_char(&m, session_id[i]); | |
1043 | ||
1044 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m); | |
1045 | buffer_free(&m); | |
1046 | } | |
1047 | ||
1048 | int | |
1049 | mm_auth_rsa_key_allowed(struct passwd *pw, BIGNUM *client_n, Key **rkey) | |
1050 | { | |
1051 | Buffer m; | |
1052 | Key *key; | |
1053 | u_char *blob; | |
1054 | u_int blen; | |
6a9b3198 | 1055 | int allowed = 0, have_forced = 0; |
700318f3 | 1056 | |
f5799ae1 | 1057 | debug3("%s entering", __func__); |
700318f3 | 1058 | |
1059 | buffer_init(&m); | |
1060 | buffer_put_bignum2(&m, client_n); | |
1061 | ||
1062 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m); | |
1063 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m); | |
1064 | ||
1065 | allowed = buffer_get_int(&m); | |
1066 | ||
6a9b3198 | 1067 | /* fake forced command */ |
1068 | auth_clear_options(); | |
1069 | have_forced = buffer_get_int(&m); | |
1070 | forced_command = have_forced ? xstrdup("true") : NULL; | |
1071 | ||
700318f3 | 1072 | if (allowed && rkey != NULL) { |
1073 | blob = buffer_get_string(&m, &blen); | |
1074 | if ((key = key_from_blob(blob, blen)) == NULL) | |
f5799ae1 | 1075 | fatal("%s: key_from_blob failed", __func__); |
700318f3 | 1076 | *rkey = key; |
1077 | xfree(blob); | |
1078 | } | |
1079 | mm_send_debug(&m); | |
1080 | buffer_free(&m); | |
1081 | ||
1082 | return (allowed); | |
1083 | } | |
1084 | ||
1085 | BIGNUM * | |
1086 | mm_auth_rsa_generate_challenge(Key *key) | |
1087 | { | |
1088 | Buffer m; | |
1089 | BIGNUM *challenge; | |
1090 | u_char *blob; | |
1091 | u_int blen; | |
1092 | ||
f5799ae1 | 1093 | debug3("%s entering", __func__); |
700318f3 | 1094 | |
1095 | if ((challenge = BN_new()) == NULL) | |
f5799ae1 | 1096 | fatal("%s: BN_new failed", __func__); |
700318f3 | 1097 | |
1098 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1099 | if (key_to_blob(key, &blob, &blen) == 0) | |
f5799ae1 | 1100 | fatal("%s: key_to_blob failed", __func__); |
700318f3 | 1101 | key->type = KEY_RSA1; |
1102 | ||
1103 | buffer_init(&m); | |
1104 | buffer_put_string(&m, blob, blen); | |
1105 | xfree(blob); | |
1106 | ||
1107 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m); | |
1108 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m); | |
1109 | ||
1110 | buffer_get_bignum2(&m, challenge); | |
1111 | buffer_free(&m); | |
1112 | ||
1113 | return (challenge); | |
1114 | } | |
1115 | ||
1116 | int | |
1117 | mm_auth_rsa_verify_response(Key *key, BIGNUM *p, u_char response[16]) | |
1118 | { | |
1119 | Buffer m; | |
1120 | u_char *blob; | |
1121 | u_int blen; | |
1122 | int success = 0; | |
1123 | ||
f5799ae1 | 1124 | debug3("%s entering", __func__); |
700318f3 | 1125 | |
1126 | key->type = KEY_RSA; /* XXX cheat for key_to_blob */ | |
1127 | if (key_to_blob(key, &blob, &blen) == 0) | |
f5799ae1 | 1128 | fatal("%s: key_to_blob failed", __func__); |
700318f3 | 1129 | key->type = KEY_RSA1; |
1130 | ||
1131 | buffer_init(&m); | |
1132 | buffer_put_string(&m, blob, blen); | |
1133 | buffer_put_string(&m, response, 16); | |
1134 | xfree(blob); | |
1135 | ||
1136 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m); | |
1137 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m); | |
1138 | ||
1139 | success = buffer_get_int(&m); | |
1140 | buffer_free(&m); | |
1141 | ||
1142 | return (success); | |
1143 | } | |
41b2f314 | 1144 | |
996d5e62 | 1145 | #ifdef SSH_AUDIT_EVENTS |
1146 | void | |
1147 | mm_audit_event(ssh_audit_event_t event) | |
1148 | { | |
1149 | Buffer m; | |
1150 | ||
1151 | debug3("%s entering", __func__); | |
1152 | ||
1153 | buffer_init(&m); | |
1154 | buffer_put_int(&m, event); | |
1155 | ||
1156 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m); | |
1157 | buffer_free(&m); | |
1158 | } | |
1159 | ||
1160 | void | |
1161 | mm_audit_run_command(const char *command) | |
1162 | { | |
1163 | Buffer m; | |
1164 | ||
1165 | debug3("%s entering command %s", __func__, command); | |
1166 | ||
1167 | buffer_init(&m); | |
1168 | buffer_put_cstring(&m, command); | |
1169 | ||
1170 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m); | |
1171 | buffer_free(&m); | |
1172 | } | |
1173 | #endif /* SSH_AUDIT_EVENTS */ | |
1174 | ||
0fff78ff | 1175 | #ifdef GSSAPI |
1176 | OM_uint32 | |
c9f39d2c | 1177 | mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid) |
41b2f314 | 1178 | { |
0fff78ff | 1179 | Buffer m; |
1180 | OM_uint32 major; | |
41b2f314 | 1181 | |
0fff78ff | 1182 | /* Client doesn't get to see the context */ |
1183 | *ctx = NULL; | |
41b2f314 | 1184 | |
1185 | buffer_init(&m); | |
c9f39d2c | 1186 | buffer_put_string(&m, goid->elements, goid->length); |
41b2f314 | 1187 | |
0fff78ff | 1188 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m); |
1189 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m); | |
1190 | ||
1191 | major = buffer_get_int(&m); | |
41b2f314 | 1192 | |
41b2f314 | 1193 | buffer_free(&m); |
0fff78ff | 1194 | return (major); |
41b2f314 | 1195 | } |
41b2f314 | 1196 | |
0fff78ff | 1197 | OM_uint32 |
1198 | mm_ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *in, | |
1199 | gss_buffer_desc *out, OM_uint32 *flags) | |
41b2f314 | 1200 | { |
41b2f314 | 1201 | Buffer m; |
0fff78ff | 1202 | OM_uint32 major; |
1203 | u_int len; | |
41b2f314 | 1204 | |
1205 | buffer_init(&m); | |
0fff78ff | 1206 | buffer_put_string(&m, in->value, in->length); |
41b2f314 | 1207 | |
0fff78ff | 1208 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m); |
1209 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m); | |
41b2f314 | 1210 | |
0fff78ff | 1211 | major = buffer_get_int(&m); |
1212 | out->value = buffer_get_string(&m, &len); | |
1213 | out->length = len; | |
1214 | if (flags) | |
1215 | *flags = buffer_get_int(&m); | |
41b2f314 | 1216 | |
0fff78ff | 1217 | buffer_free(&m); |
1218 | ||
1219 | return (major); | |
1220 | } | |
1221 | ||
cdd66111 | 1222 | OM_uint32 |
1223 | mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic) | |
1224 | { | |
1225 | Buffer m; | |
1226 | OM_uint32 major; | |
1227 | ||
1228 | buffer_init(&m); | |
1229 | buffer_put_string(&m, gssbuf->value, gssbuf->length); | |
1230 | buffer_put_string(&m, gssmic->value, gssmic->length); | |
1231 | ||
1232 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m); | |
1233 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC, | |
1234 | &m); | |
1235 | ||
1236 | major = buffer_get_int(&m); | |
1237 | buffer_free(&m); | |
1238 | return(major); | |
1239 | } | |
1240 | ||
0fff78ff | 1241 | int |
f97edba6 | 1242 | mm_ssh_gssapi_userok(char *user, struct passwd *pw) |
0fff78ff | 1243 | { |
1244 | Buffer m; | |
1245 | int authenticated = 0; | |
1246 | ||
1247 | buffer_init(&m); | |
1248 | ||
1249 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m); | |
1250 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK, | |
1251 | &m); | |
1252 | ||
1253 | authenticated = buffer_get_int(&m); | |
41b2f314 | 1254 | |
1255 | buffer_free(&m); | |
0fff78ff | 1256 | debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not "); |
1257 | return (authenticated); | |
41b2f314 | 1258 | } |
f97edba6 | 1259 | |
1260 | OM_uint32 | |
1261 | mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash) | |
1262 | { | |
1263 | Buffer m; | |
1264 | OM_uint32 major; | |
1265 | u_int len; | |
1266 | ||
1267 | buffer_init(&m); | |
1268 | buffer_put_string(&m, data->value, data->length); | |
1269 | ||
1270 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, &m); | |
1271 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, &m); | |
1272 | ||
1273 | major = buffer_get_int(&m); | |
1274 | hash->value = buffer_get_string(&m, &len); | |
1275 | hash->length = len; | |
1276 | ||
1277 | buffer_free(&m); | |
1278 | ||
1279 | return(major); | |
1280 | } | |
1281 | ||
1282 | int | |
1283 | mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *store) | |
1284 | { | |
1285 | Buffer m; | |
1286 | int ok; | |
1287 | ||
1288 | buffer_init(&m); | |
1289 | ||
1290 | buffer_put_cstring(&m, store->filename ? store->filename : ""); | |
1291 | buffer_put_cstring(&m, store->envvar ? store->envvar : ""); | |
1292 | buffer_put_cstring(&m, store->envval ? store->envval : ""); | |
1293 | ||
1294 | mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUPCREDS, &m); | |
1295 | mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUPCREDS, &m); | |
1296 | ||
1297 | ok = buffer_get_int(&m); | |
1298 | ||
1299 | buffer_free(&m); | |
1300 | ||
1301 | return (ok); | |
1302 | } | |
1303 | ||
0fff78ff | 1304 | #endif /* GSSAPI */ |
91d9cdd3 | 1305 | |
1306 | #ifdef JPAKE | |
1307 | void | |
1308 | mm_auth2_jpake_get_pwdata(Authctxt *authctxt, BIGNUM **s, | |
1309 | char **hash_scheme, char **salt) | |
1310 | { | |
1311 | Buffer m; | |
1312 | ||
1313 | debug3("%s entering", __func__); | |
1314 | ||
1315 | buffer_init(&m); | |
1316 | mm_request_send(pmonitor->m_recvfd, | |
1317 | MONITOR_REQ_JPAKE_GET_PWDATA, &m); | |
1318 | ||
1319 | debug3("%s: waiting for MONITOR_ANS_JPAKE_GET_PWDATA", __func__); | |
1320 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1321 | MONITOR_ANS_JPAKE_GET_PWDATA, &m); | |
1322 | ||
1323 | *hash_scheme = buffer_get_string(&m, NULL); | |
1324 | *salt = buffer_get_string(&m, NULL); | |
1325 | ||
1326 | buffer_free(&m); | |
1327 | } | |
1328 | ||
1329 | void | |
1330 | mm_jpake_step1(struct jpake_group *grp, | |
1331 | u_char **id, u_int *id_len, | |
1332 | BIGNUM **priv1, BIGNUM **priv2, BIGNUM **g_priv1, BIGNUM **g_priv2, | |
1333 | u_char **priv1_proof, u_int *priv1_proof_len, | |
1334 | u_char **priv2_proof, u_int *priv2_proof_len) | |
1335 | { | |
1336 | Buffer m; | |
1337 | ||
1338 | debug3("%s entering", __func__); | |
1339 | ||
1340 | buffer_init(&m); | |
1341 | mm_request_send(pmonitor->m_recvfd, | |
1342 | MONITOR_REQ_JPAKE_STEP1, &m); | |
1343 | ||
1344 | debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP1", __func__); | |
1345 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1346 | MONITOR_ANS_JPAKE_STEP1, &m); | |
1347 | ||
1348 | if ((*priv1 = BN_new()) == NULL || | |
1349 | (*priv2 = BN_new()) == NULL || | |
1350 | (*g_priv1 = BN_new()) == NULL || | |
1351 | (*g_priv2 = BN_new()) == NULL) | |
1352 | fatal("%s: BN_new", __func__); | |
1353 | ||
1354 | *id = buffer_get_string(&m, id_len); | |
1355 | /* priv1 and priv2 are, well, private */ | |
1356 | buffer_get_bignum2(&m, *g_priv1); | |
1357 | buffer_get_bignum2(&m, *g_priv2); | |
1358 | *priv1_proof = buffer_get_string(&m, priv1_proof_len); | |
1359 | *priv2_proof = buffer_get_string(&m, priv2_proof_len); | |
1360 | ||
1361 | buffer_free(&m); | |
1362 | } | |
1363 | ||
1364 | void | |
1365 | mm_jpake_step2(struct jpake_group *grp, BIGNUM *s, | |
1366 | BIGNUM *mypub1, BIGNUM *theirpub1, BIGNUM *theirpub2, BIGNUM *mypriv2, | |
1367 | const u_char *theirid, u_int theirid_len, | |
1368 | const u_char *myid, u_int myid_len, | |
1369 | const u_char *theirpub1_proof, u_int theirpub1_proof_len, | |
1370 | const u_char *theirpub2_proof, u_int theirpub2_proof_len, | |
1371 | BIGNUM **newpub, | |
1372 | u_char **newpub_exponent_proof, u_int *newpub_exponent_proof_len) | |
1373 | { | |
1374 | Buffer m; | |
1375 | ||
1376 | debug3("%s entering", __func__); | |
1377 | ||
1378 | buffer_init(&m); | |
1379 | /* monitor already has all bignums except theirpub1, theirpub2 */ | |
1380 | buffer_put_bignum2(&m, theirpub1); | |
1381 | buffer_put_bignum2(&m, theirpub2); | |
1382 | /* monitor already knows our id */ | |
1383 | buffer_put_string(&m, theirid, theirid_len); | |
1384 | buffer_put_string(&m, theirpub1_proof, theirpub1_proof_len); | |
1385 | buffer_put_string(&m, theirpub2_proof, theirpub2_proof_len); | |
1386 | ||
1387 | mm_request_send(pmonitor->m_recvfd, | |
1388 | MONITOR_REQ_JPAKE_STEP2, &m); | |
1389 | ||
1390 | debug3("%s: waiting for MONITOR_ANS_JPAKE_STEP2", __func__); | |
1391 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1392 | MONITOR_ANS_JPAKE_STEP2, &m); | |
1393 | ||
1394 | if ((*newpub = BN_new()) == NULL) | |
1395 | fatal("%s: BN_new", __func__); | |
1396 | ||
1397 | buffer_get_bignum2(&m, *newpub); | |
1398 | *newpub_exponent_proof = buffer_get_string(&m, | |
1399 | newpub_exponent_proof_len); | |
1400 | ||
1401 | buffer_free(&m); | |
1402 | } | |
1403 | ||
1404 | void | |
1405 | mm_jpake_key_confirm(struct jpake_group *grp, BIGNUM *s, BIGNUM *step2_val, | |
1406 | BIGNUM *mypriv2, BIGNUM *mypub1, BIGNUM *mypub2, | |
1407 | BIGNUM *theirpub1, BIGNUM *theirpub2, | |
1408 | const u_char *my_id, u_int my_id_len, | |
1409 | const u_char *their_id, u_int their_id_len, | |
1410 | const u_char *sess_id, u_int sess_id_len, | |
1411 | const u_char *theirpriv2_s_proof, u_int theirpriv2_s_proof_len, | |
1412 | BIGNUM **k, | |
1413 | u_char **confirm_hash, u_int *confirm_hash_len) | |
1414 | { | |
1415 | Buffer m; | |
1416 | ||
1417 | debug3("%s entering", __func__); | |
1418 | ||
1419 | buffer_init(&m); | |
1420 | /* monitor already has all bignums except step2_val */ | |
1421 | buffer_put_bignum2(&m, step2_val); | |
1422 | /* monitor already knows all the ids */ | |
1423 | buffer_put_string(&m, theirpriv2_s_proof, theirpriv2_s_proof_len); | |
1424 | ||
1425 | mm_request_send(pmonitor->m_recvfd, | |
1426 | MONITOR_REQ_JPAKE_KEY_CONFIRM, &m); | |
1427 | ||
1428 | debug3("%s: waiting for MONITOR_ANS_JPAKE_KEY_CONFIRM", __func__); | |
1429 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1430 | MONITOR_ANS_JPAKE_KEY_CONFIRM, &m); | |
1431 | ||
1432 | /* 'k' is sensitive and stays in the monitor */ | |
1433 | *confirm_hash = buffer_get_string(&m, confirm_hash_len); | |
1434 | ||
1435 | buffer_free(&m); | |
1436 | } | |
1437 | ||
1438 | int | |
1439 | mm_jpake_check_confirm(const BIGNUM *k, | |
1440 | const u_char *peer_id, u_int peer_id_len, | |
1441 | const u_char *sess_id, u_int sess_id_len, | |
1442 | const u_char *peer_confirm_hash, u_int peer_confirm_hash_len) | |
1443 | { | |
1444 | Buffer m; | |
1445 | int success = 0; | |
1446 | ||
1447 | debug3("%s entering", __func__); | |
1448 | ||
1449 | buffer_init(&m); | |
1450 | /* k is dummy in slave, ignored */ | |
1451 | /* monitor knows all the ids */ | |
1452 | buffer_put_string(&m, peer_confirm_hash, peer_confirm_hash_len); | |
1453 | mm_request_send(pmonitor->m_recvfd, | |
1454 | MONITOR_REQ_JPAKE_CHECK_CONFIRM, &m); | |
1455 | ||
1456 | debug3("%s: waiting for MONITOR_ANS_JPAKE_CHECK_CONFIRM", __func__); | |
1457 | mm_request_receive_expect(pmonitor->m_recvfd, | |
1458 | MONITOR_ANS_JPAKE_CHECK_CONFIRM, &m); | |
1459 | ||
1460 | success = buffer_get_int(&m); | |
1461 | buffer_free(&m); | |
1462 | ||
1463 | debug3("%s: success = %d", __func__, success); | |
1464 | return success; | |
1465 | } | |
1466 | #endif /* JPAKE */ |