| blob | 579a06494adb0b064ed0f10c7ede0bc08c4956c4 |
1 /*\r
2 * Platform-independent bits of X11 forwarding.\r
3 */\r
4 \r
5 #include <stdio.h>\r
6 #include <stdlib.h>\r
7 #include <assert.h>\r
8 #include <time.h>\r
9 \r
10 #include "putty.h"\r
11 #include "ssh.h"\r
12 #include "sshchan.h"\r
13 #include "tree234.h"\r
14 \r
15 static inline uint16_t GET_16BIT_X11(char endian, const void *p)\r
16 {\r
17 return endian == 'B' ? GET_16BIT_MSB_FIRST(p) : GET_16BIT_LSB_FIRST(p);\r
18 }\r
19 \r
20 static inline void PUT_16BIT_X11(char endian, void *p, uint16_t value)\r
21 {\r
22 if (endian == 'B')\r
23 PUT_16BIT_MSB_FIRST(p, value);\r
24 else\r
25 PUT_16BIT_LSB_FIRST(p, value);\r
26 }\r
27 \r
28 const char *const x11_authnames[] = {\r
29 "", "MIT-MAGIC-COOKIE-1", "XDM-AUTHORIZATION-1"\r
30 };\r
31 \r
32 struct XDMSeen {\r
33 unsigned int time;\r
34 unsigned char clientid[6];\r
35 };\r
36 \r
37 typedef struct X11Connection {\r
38 unsigned char firstpkt[12]; /* first X data packet */\r
39 tree234 *authtree;\r
40 struct X11Display *disp;\r
41 char *auth_protocol;\r
42 unsigned char *auth_data;\r
43 int data_read, auth_plen, auth_psize, auth_dlen, auth_dsize;\r
44 bool verified;\r
45 bool input_wanted;\r
46 bool no_data_sent_to_x_client;\r
47 char *peer_addr;\r
48 int peer_port;\r
49 SshChannel *c; /* channel structure held by SSH backend */\r
50 Socket *s;\r
51 \r
52 Plug plug;\r
53 Channel chan;\r
54 } X11Connection;\r
55 \r
56 static int xdmseen_cmp(void *a, void *b)\r
57 {\r
58 struct XDMSeen *sa = a, *sb = b;\r
59 return sa->time > sb->time ? 1 :\r
60 sa->time < sb->time ? -1 :\r
61 memcmp(sa->clientid, sb->clientid, sizeof(sa->clientid));\r
62 }\r
63 \r
64 struct X11FakeAuth *x11_invent_fake_auth(tree234 *authtree, int authtype)\r
65 {\r
66 struct X11FakeAuth *auth = snew(struct X11FakeAuth);\r
67 int i;\r
68 \r
69 /*\r
70 * This function has the job of inventing a set of X11 fake auth\r
71 * data, and adding it to 'authtree'. We must preserve the\r
72 * property that for any given actual authorisation attempt, _at\r
73 * most one_ thing in the tree can possibly match it.\r
74 *\r
75 * For MIT-MAGIC-COOKIE-1, that's not too difficult: the match\r
76 * criterion is simply that the entire cookie is correct, so we\r
77 * just have to make sure we don't make up two cookies the same.\r
78 * (Vanishingly unlikely, but we check anyway to be sure, and go\r
79 * round again inventing a new cookie if add234 tells us the one\r
80 * we thought of is already in use.)\r
81 *\r
82 * For XDM-AUTHORIZATION-1, it's a little more fiddly. The setup\r
83 * with XA1 is that half the cookie is used as a DES key with\r
84 * which to CBC-encrypt an assortment of stuff. Happily, the stuff\r
85 * encrypted _begins_ with the other half of the cookie, and the\r
86 * IV is always zero, which means that any valid XA1 authorisation\r
87 * attempt for a given cookie must begin with the same cipher\r
88 * block, consisting of the DES ECB encryption of the first half\r
89 * of the cookie using the second half as a key. So we compute\r
90 * that cipher block here and now, and use it as the sorting key\r
91 * for distinguishing XA1 entries in the tree.\r
92 */\r
93 \r
94 if (authtype == X11_MIT) {\r
95 auth->proto = X11_MIT;\r
96 \r
97 /* MIT-MAGIC-COOKIE-1. Cookie size is 128 bits (16 bytes). */\r
98 auth->datalen = 16;\r
99 auth->data = snewn(auth->datalen, unsigned char);\r
100 auth->xa1_firstblock = NULL;\r
101 \r
102 while (1) {\r
103 random_read(auth->data, auth->datalen);\r
104 if (add234(authtree, auth) == auth)\r
105 break;\r
106 }\r
107 \r
108 auth->xdmseen = NULL;\r
109 } else {\r
110 assert(authtype == X11_XDM);\r
111 auth->proto = X11_XDM;\r
112 \r
113 /* XDM-AUTHORIZATION-1. Cookie size is 16 bytes; byte 8 is zero. */\r
114 auth->datalen = 16;\r
115 auth->data = snewn(auth->datalen, unsigned char);\r
116 auth->xa1_firstblock = snewn(8, unsigned char);\r
117 memset(auth->xa1_firstblock, 0, 8);\r
118 \r
119 while (1) {\r
120 random_read(auth->data, 15);\r
121 auth->data[15] = auth->data[8];\r
122 auth->data[8] = 0;\r
123 \r
124 memcpy(auth->xa1_firstblock, auth->data, 8);\r
125 des_encrypt_xdmauth(auth->data + 9, auth->xa1_firstblock, 8);\r
126 if (add234(authtree, auth) == auth)\r
127 break;\r
128 }\r
129 \r
130 auth->xdmseen = newtree234(xdmseen_cmp);\r
131 }\r
132 auth->protoname = dupstr(x11_authnames[auth->proto]);\r
133 auth->datastring = snewn(auth->datalen * 2 + 1, char);\r
134 for (i = 0; i < auth->datalen; i++)\r
135 sprintf(auth->datastring + i*2, "%02x",\r
136 auth->data[i]);\r
137 \r
138 auth->disp = NULL;\r
139 auth->share_cs = NULL;\r
140 auth->share_chan = NULL;\r
141 \r
142 return auth;\r
143 }\r
144 \r
145 void x11_free_fake_auth(struct X11FakeAuth *auth)\r
146 {\r
147 if (auth->data)\r
148 smemclr(auth->data, auth->datalen);\r
149 sfree(auth->data);\r
150 sfree(auth->protoname);\r
151 sfree(auth->datastring);\r
152 sfree(auth->xa1_firstblock);\r
153 if (auth->xdmseen != NULL) {\r
154 struct XDMSeen *seen;\r
155 while ((seen = delpos234(auth->xdmseen, 0)) != NULL)\r
156 sfree(seen);\r
157 freetree234(auth->xdmseen);\r
158 }\r
159 sfree(auth);\r
160 }\r
161 \r
162 int x11_authcmp(void *av, void *bv)\r
163 {\r
164 struct X11FakeAuth *a = (struct X11FakeAuth *)av;\r
165 struct X11FakeAuth *b = (struct X11FakeAuth *)bv;\r
166 \r
167 if (a->proto < b->proto)\r
168 return -1;\r
169 else if (a->proto > b->proto)\r
170 return +1;\r
171 \r
172 if (a->proto == X11_MIT) {\r
173 if (a->datalen < b->datalen)\r
174 return -1;\r
175 else if (a->datalen > b->datalen)\r
176 return +1;\r
177 \r
178 return memcmp(a->data, b->data, a->datalen);\r
179 } else {\r
180 assert(a->proto == X11_XDM);\r
181 \r
182 return memcmp(a->xa1_firstblock, b->xa1_firstblock, 8);\r
183 }\r
184 }\r
185 \r
186 struct X11Display *x11_setup_display(const char *display, Conf *conf,\r
187 char **error_msg)\r
188 {\r
189 struct X11Display *disp = snew(struct X11Display);\r
190 char *localcopy;\r
191 \r
192 *error_msg = NULL;\r
193 \r
194 if (!display || !*display) {\r
195 localcopy = platform_get_x_display();\r
196 if (!localcopy || !*localcopy) {\r
197 sfree(localcopy);\r
198 localcopy = dupstr(":0"); /* plausible default for any platform */\r
199 }\r
200 } else\r
201 localcopy = dupstr(display);\r
202 \r
203 /*\r
204 * Parse the display name.\r
205 *\r
206 * We expect this to have one of the following forms:\r
207 *\r
208 * - the standard X format which looks like\r
209 * [ [ protocol '/' ] host ] ':' displaynumber [ '.' screennumber ]\r
210 * (X11 also permits a double colon to indicate DECnet, but\r
211 * that's not our problem, thankfully!)\r
212 *\r
213 * - only seen in the wild on MacOS (so far): a pathname to a\r
214 * Unix-domain socket, which will typically and confusingly\r
215 * end in ":0", and which I'm currently distinguishing from\r
216 * the standard scheme by noting that it starts with '/'.\r
217 */\r
218 if (localcopy[0] == '/') {\r
219 disp->unixsocketpath = localcopy;\r
220 disp->unixdomain = true;\r
221 disp->hostname = NULL;\r
222 disp->displaynum = -1;\r
223 disp->screennum = 0;\r
224 disp->addr = NULL;\r
225 } else {\r
226 char *colon, *dot, *slash;\r
227 char *protocol, *hostname;\r
228 \r
229 colon = host_strrchr(localcopy, ':');\r
230 if (!colon) {\r
231 *error_msg = dupprintf("display name '%s' has no ':number'"\r
232 " suffix", localcopy);\r
233 \r
234 sfree(disp);\r
235 sfree(localcopy);\r
236 return NULL;\r
237 }\r
238 \r
239 *colon++ = '\0';\r
240 dot = strchr(colon, '.');\r
241 if (dot)\r
242 *dot++ = '\0';\r
243 \r
244 disp->displaynum = atoi(colon);\r
245 if (dot)\r
246 disp->screennum = atoi(dot);\r
247 else\r
248 disp->screennum = 0;\r
249 \r
250 protocol = NULL;\r
251 hostname = localcopy;\r
252 if (colon > localcopy) {\r
253 slash = strchr(localcopy, '/');\r
254 if (slash) {\r
255 *slash++ = '\0';\r
256 protocol = localcopy;\r
257 hostname = slash;\r
258 }\r
259 }\r
260 \r
261 disp->hostname = *hostname ? dupstr(hostname) : NULL;\r
262 \r
263 if (protocol)\r
264 disp->unixdomain = (!strcmp(protocol, "local") ||\r
265 !strcmp(protocol, "unix"));\r
266 else if (!*hostname || !strcmp(hostname, "unix"))\r
267 disp->unixdomain = platform_uses_x11_unix_by_default;\r
268 else\r
269 disp->unixdomain = false;\r
270 \r
271 if (!disp->hostname && !disp->unixdomain)\r
272 disp->hostname = dupstr("localhost");\r
273 \r
274 disp->unixsocketpath = NULL;\r
275 disp->addr = NULL;\r
276 \r
277 sfree(localcopy);\r
278 }\r
279 \r
280 /*\r
281 * Look up the display hostname, if we need to.\r
282 */\r
283 if (!disp->unixdomain) {\r
284 const char *err;\r
285 \r
286 disp->port = 6000 + disp->displaynum;\r
287 disp->addr = name_lookup(disp->hostname, disp->port,\r
288 &disp->realhost, conf, ADDRTYPE_UNSPEC,\r
289 NULL, NULL);\r
290 \r
291 if ((err = sk_addr_error(disp->addr)) != NULL) {\r
292 *error_msg = dupprintf("unable to resolve host name '%s' in "\r
293 "display name", disp->hostname);\r
294 \r
295 sk_addr_free(disp->addr);\r
296 sfree(disp->hostname);\r
297 sfree(disp->unixsocketpath);\r
298 sfree(disp);\r
299 return NULL;\r
300 }\r
301 }\r
302 \r
303 /*\r
304 * Try upgrading an IP-style localhost display to a Unix-socket\r
305 * display (as the standard X connection libraries do).\r
306 */\r
307 if (!disp->unixdomain && sk_address_is_local(disp->addr)) {\r
308 SockAddr *ux = platform_get_x11_unix_address(NULL, disp->displaynum);\r
309 const char *err = sk_addr_error(ux);\r
310 if (!err) {\r
311 /* Create trial connection to see if there is a useful Unix-domain\r
312 * socket */\r
313 Socket *s = sk_new(sk_addr_dup(ux), 0, false, false,\r
314 false, false, nullplug);\r
315 err = sk_socket_error(s);\r
316 sk_close(s);\r
317 }\r
318 if (err) {\r
319 sk_addr_free(ux);\r
320 } else {\r
321 sk_addr_free(disp->addr);\r
322 disp->unixdomain = true;\r
323 disp->addr = ux;\r
324 /* Fill in the rest in a moment */\r
325 }\r
326 }\r
327 \r
328 if (disp->unixdomain) {\r
329 if (!disp->addr)\r
330 disp->addr = platform_get_x11_unix_address(disp->unixsocketpath,\r
331 disp->displaynum);\r
332 if (disp->unixsocketpath)\r
333 disp->realhost = dupstr(disp->unixsocketpath);\r
334 else\r
335 disp->realhost = dupprintf("unix:%d", disp->displaynum);\r
336 disp->port = 0;\r
337 }\r
338 \r
339 /*\r
340 * Fetch the local authorisation details.\r
341 */\r
342 disp->localauthproto = X11_NO_AUTH;\r
343 disp->localauthdata = NULL;\r
344 disp->localauthdatalen = 0;\r
345 platform_get_x11_auth(disp, conf);\r
346 \r
347 return disp;\r
348 }\r
349 \r
350 void x11_free_display(struct X11Display *disp)\r
351 {\r
352 sfree(disp->hostname);\r
353 sfree(disp->unixsocketpath);\r
354 if (disp->localauthdata)\r
355 smemclr(disp->localauthdata, disp->localauthdatalen);\r
356 sfree(disp->localauthdata);\r
357 sk_addr_free(disp->addr);\r
358 sfree(disp);\r
359 }\r
360 \r
361 #define XDM_MAXSKEW 20*60 /* 20 minute clock skew should be OK */\r
362 \r
363 static const char *x11_verify(unsigned long peer_ip, int peer_port,\r
364 tree234 *authtree, char *proto,\r
365 unsigned char *data, int dlen,\r
366 struct X11FakeAuth **auth_ret)\r
367 {\r
368 struct X11FakeAuth match_dummy; /* for passing to find234 */\r
369 struct X11FakeAuth *auth;\r
370 \r
371 /*\r
372 * First, do a lookup in our tree to find the only authorisation\r
373 * record that _might_ match.\r
374 */\r
375 if (!strcmp(proto, x11_authnames[X11_MIT])) {\r
376 /*\r
377 * Just look up the whole cookie that was presented to us,\r
378 * which x11_authcmp will compare against the cookies we\r
379 * currently believe in.\r
380 */\r
381 match_dummy.proto = X11_MIT;\r
382 match_dummy.datalen = dlen;\r
383 match_dummy.data = data;\r
384 } else if (!strcmp(proto, x11_authnames[X11_XDM])) {\r
385 /*\r
386 * Look up the first cipher block, against the stored first\r
387 * cipher blocks for the XDM-AUTHORIZATION-1 cookies we\r
388 * currently know. (See comment in x11_invent_fake_auth.)\r
389 */\r
390 match_dummy.proto = X11_XDM;\r
391 match_dummy.xa1_firstblock = data;\r
392 } else {\r
393 return "Unsupported authorisation protocol";\r
394 }\r
395 \r
396 if ((auth = find234(authtree, &match_dummy, 0)) == NULL)\r
397 return "Authorisation not recognised";\r
398 \r
399 /*\r
400 * If we're using MIT-MAGIC-COOKIE-1, that was all we needed. If\r
401 * we're doing XDM-AUTHORIZATION-1, though, we have to check the\r
402 * rest of the auth data.\r
403 */\r
404 if (auth->proto == X11_XDM) {\r
405 unsigned long t;\r
406 time_t tim;\r
407 int i;\r
408 struct XDMSeen *seen, *ret;\r
409 \r
410 if (dlen != 24)\r
411 return "XDM-AUTHORIZATION-1 data was wrong length";\r
412 if (peer_port == -1)\r
413 return "cannot do XDM-AUTHORIZATION-1 without remote address data";\r
414 des_decrypt_xdmauth(auth->data+9, data, 24);\r
415 if (memcmp(auth->data, data, 8) != 0)\r
416 return "XDM-AUTHORIZATION-1 data failed check"; /* cookie wrong */\r
417 if (GET_32BIT_MSB_FIRST(data+8) != peer_ip)\r
418 return "XDM-AUTHORIZATION-1 data failed check"; /* IP wrong */\r
419 if ((int)GET_16BIT_MSB_FIRST(data+12) != peer_port)\r
420 return "XDM-AUTHORIZATION-1 data failed check"; /* port wrong */\r
421 t = GET_32BIT_MSB_FIRST(data+14);\r
422 for (i = 18; i < 24; i++)\r
423 if (data[i] != 0) /* zero padding wrong */\r
424 return "XDM-AUTHORIZATION-1 data failed check";\r
425 tim = time(NULL);\r
426 if (((unsigned long)t - (unsigned long)tim\r
427 + XDM_MAXSKEW) > 2*XDM_MAXSKEW)\r
428 return "XDM-AUTHORIZATION-1 time stamp was too far out";\r
429 seen = snew(struct XDMSeen);\r
430 seen->time = t;\r
431 memcpy(seen->clientid, data+8, 6);\r
432 assert(auth->xdmseen != NULL);\r
433 ret = add234(auth->xdmseen, seen);\r
434 if (ret != seen) {\r
435 sfree(seen);\r
436 return "XDM-AUTHORIZATION-1 data replayed";\r
437 }\r
438 /* While we're here, purge entries too old to be replayed. */\r
439 for (;;) {\r
440 seen = index234(auth->xdmseen, 0);\r
441 assert(seen != NULL);\r
442 if (t - seen->time <= XDM_MAXSKEW)\r
443 break;\r
444 sfree(delpos234(auth->xdmseen, 0));\r
445 }\r
446 }\r
447 /* implement other protocols here if ever required */\r
448 \r
449 *auth_ret = auth;\r
450 return NULL;\r
451 }\r
452 \r
453 ptrlen BinarySource_get_string_xauth(BinarySource *src)\r
454 {\r
455 size_t len = get_uint16(src);\r
456 return get_data(src, len);\r
457 }\r
458 #define get_string_xauth(src) \\r
459 BinarySource_get_string_xauth(BinarySource_UPCAST(src))\r
460 \r
461 void BinarySink_put_stringpl_xauth(BinarySink *bs, ptrlen pl)\r
462 {\r
463 assert((pl.len >> 16) == 0);\r
464 put_uint16(bs, pl.len);\r
465 put_datapl(bs, pl);\r
466 }\r
467 #define put_stringpl_xauth(bs, ptrlen) \\r
468 BinarySink_put_stringpl_xauth(BinarySink_UPCAST(bs),ptrlen)\r
469 \r
470 void x11_get_auth_from_authfile(struct X11Display *disp,\r
471 const char *authfilename)\r
472 {\r
473 FILE *authfp;\r
474 char *buf;\r
475 int size;\r
476 BinarySource src[1];\r
477 int family, protocol;\r
478 ptrlen addr, protoname, data;\r
479 char *displaynum_string;\r
480 int displaynum;\r
481 bool ideal_match = false;\r
482 char *ourhostname;\r
483 \r
484 /* A maximally sized (wildly implausible) .Xauthority record\r
485 * consists of a 16-bit integer to start with, then four strings,\r
486 * each of which has a 16-bit length field followed by that many\r
487 * bytes of data (i.e. up to 0xFFFF bytes). */\r
488 const size_t MAX_RECORD_SIZE = 2 + 4 * (2+0xFFFF);\r
489 \r
490 /* We'll want a buffer of twice that size (see below). */\r
491 const size_t BUF_SIZE = 2 * MAX_RECORD_SIZE;\r
492 \r
493 /*\r
494 * Normally we should look for precisely the details specified in\r
495 * `disp'. However, there's an oddity when the display is local:\r
496 * displays like "localhost:0" usually have their details stored\r
497 * in a Unix-domain-socket record (even if there isn't actually a\r
498 * real Unix-domain socket available, as with OpenSSH's proxy X11\r
499 * server).\r
500 *\r
501 * This is apparently a fudge to get round the meaninglessness of\r
502 * "localhost" in a shared-home-directory context -- xauth entries\r
503 * for Unix-domain sockets already disambiguate this by storing\r
504 * the *local* hostname in the conveniently-blank hostname field,\r
505 * but IP "localhost" records couldn't do this. So, typically, an\r
506 * IP "localhost" entry in the auth database isn't present and if\r
507 * it were it would be ignored.\r
508 *\r
509 * However, we don't entirely trust that (say) Windows X servers\r
510 * won't rely on a straight "localhost" entry, bad idea though\r
511 * that is; so if we can't find a Unix-domain-socket entry we'll\r
512 * fall back to an IP-based entry if we can find one.\r
513 */\r
514 bool localhost = !disp->unixdomain && sk_address_is_local(disp->addr);\r
515 \r
516 authfp = fopen(authfilename, "rb");\r
517 if (!authfp)\r
518 return;\r
519 \r
520 ourhostname = get_hostname();\r
521 \r
522 /*\r
523 * Allocate enough space to hold two maximally sized records, so\r
524 * that a full record can start anywhere in the first half. That\r
525 * way we avoid the accidentally-quadratic algorithm that would\r
526 * arise if we moved everything to the front of the buffer after\r
527 * consuming each record; instead, we only move everything to the\r
528 * front after our current position gets past the half-way mark.\r
529 * Before then, there's no need to move anyway; so this guarantees\r
530 * linear time, in that every byte written into this buffer moves\r
531 * at most once (because every move is from the second half of the\r
532 * buffer to the first half).\r
533 */\r
534 buf = snewn(BUF_SIZE, char);\r
535 size = fread(buf, 1, BUF_SIZE, authfp);\r
536 BinarySource_BARE_INIT(src, buf, size);\r
537 \r
538 while (!ideal_match) {\r
539 bool match = false;\r
540 \r
541 if (src->pos >= MAX_RECORD_SIZE) {\r
542 size -= src->pos;\r
543 memcpy(buf, buf + src->pos, size);\r
544 size += fread(buf + size, 1, BUF_SIZE - size, authfp);\r
545 BinarySource_BARE_INIT(src, buf, size);\r
546 }\r
547 \r
548 family = get_uint16(src);\r
549 addr = get_string_xauth(src);\r
550 displaynum_string = mkstr(get_string_xauth(src));\r
551 displaynum = displaynum_string[0] ? atoi(displaynum_string) : -1;\r
552 sfree(displaynum_string);\r
553 protoname = get_string_xauth(src);\r
554 data = get_string_xauth(src);\r
555 if (get_err(src))\r
556 break;\r
557 \r
558 /*\r
559 * Now we have a full X authority record in memory. See\r
560 * whether it matches the display we're trying to\r
561 * authenticate to.\r
562 *\r
563 * The details we've just read should be interpreted as\r
564 * follows:\r
565 *\r
566 * - 'family' is the network address family used to\r
567 * connect to the display. 0 means IPv4; 6 means IPv6;\r
568 * 256 means Unix-domain sockets.\r
569 *\r
570 * - 'addr' is the network address itself. For IPv4 and\r
571 * IPv6, this is a string of binary data of the\r
572 * appropriate length (respectively 4 and 16 bytes)\r
573 * representing the address in big-endian format, e.g.\r
574 * 7F 00 00 01 means IPv4 localhost. For Unix-domain\r
575 * sockets, this is the host name of the machine on\r
576 * which the Unix-domain display resides (so that an\r
577 * .Xauthority file on a shared file system can contain\r
578 * authority entries for Unix-domain displays on\r
579 * several machines without them clashing).\r
580 *\r
581 * - 'displaynum' is the display number. An empty display\r
582 * number is a wildcard for any display number.\r
583 *\r
584 * - 'protoname' is the authorisation protocol, encoded as\r
585 * its canonical string name (i.e. "MIT-MAGIC-COOKIE-1",\r
586 * "XDM-AUTHORIZATION-1" or something we don't recognise).\r
587 *\r
588 * - 'data' is the actual authorisation data, stored in\r
589 * binary form.\r
590 */\r
591 \r
592 if (disp->displaynum < 0 ||\r
593 (displaynum >= 0 && disp->displaynum != displaynum))\r
594 continue; /* not the one */\r
595 \r
596 for (protocol = 1; protocol < lenof(x11_authnames); protocol++)\r
597 if (ptrlen_eq_string(protoname, x11_authnames[protocol]))\r
598 break;\r
599 if (protocol == lenof(x11_authnames))\r
600 continue; /* don't recognise this protocol, look for another */\r
601 \r
602 switch (family) {\r
603 case 0: /* IPv4 */\r
604 if (!disp->unixdomain &&\r
605 sk_addrtype(disp->addr) == ADDRTYPE_IPV4) {\r
606 char buf[4];\r
607 sk_addrcopy(disp->addr, buf);\r
608 if (addr.len == 4 && !memcmp(addr.ptr, buf, 4)) {\r
609 match = true;\r
610 /* If this is a "localhost" entry, note it down\r
611 * but carry on looking for a Unix-domain entry. */\r
612 ideal_match = !localhost;\r
613 }\r
614 }\r
615 break;\r
616 case 6: /* IPv6 */\r
617 if (!disp->unixdomain &&\r
618 sk_addrtype(disp->addr) == ADDRTYPE_IPV6) {\r
619 char buf[16];\r
620 sk_addrcopy(disp->addr, buf);\r
621 if (addr.len == 16 && !memcmp(addr.ptr, buf, 16)) {\r
622 match = true;\r
623 ideal_match = !localhost;\r
624 }\r
625 }\r
626 break;\r
627 case 256: /* Unix-domain / localhost */\r
628 if ((disp->unixdomain || localhost)\r
629 && ourhostname && ptrlen_eq_string(addr, ourhostname)) {\r
630 /* A matching Unix-domain socket is always the best\r
631 * match. */\r
632 match = true;\r
633 ideal_match = true;\r
634 }\r
635 break;\r
636 }\r
637 \r
638 if (match) {\r
639 /* Current best guess -- may be overridden if !ideal_match */\r
640 disp->localauthproto = protocol;\r
641 sfree(disp->localauthdata); /* free previous guess, if any */\r
642 disp->localauthdata = snewn(data.len, unsigned char);\r
643 memcpy(disp->localauthdata, data.ptr, data.len);\r
644 disp->localauthdatalen = data.len;\r
645 }\r
646 }\r
647 \r
648 fclose(authfp);\r
649 smemclr(buf, 2 * MAX_RECORD_SIZE);\r
650 sfree(buf);\r
651 sfree(ourhostname);\r
652 }\r
653 \r
654 void x11_format_auth_for_authfile(\r
655 BinarySink *bs, SockAddr *addr, int display_no,\r
656 ptrlen authproto, ptrlen authdata)\r
657 {\r
658 if (sk_address_is_special_local(addr)) {\r
659 char *ourhostname = get_hostname();\r
660 put_uint16(bs, 256); /* indicates Unix-domain socket */\r
661 put_stringpl_xauth(bs, ptrlen_from_asciz(ourhostname));\r
662 sfree(ourhostname);\r
663 } else if (sk_addrtype(addr) == ADDRTYPE_IPV4) {\r
664 char ipv4buf[4];\r
665 sk_addrcopy(addr, ipv4buf);\r
666 put_uint16(bs, 0); /* indicates IPv4 */\r
667 put_stringpl_xauth(bs, make_ptrlen(ipv4buf, 4));\r
668 } else if (sk_addrtype(addr) == ADDRTYPE_IPV6) {\r
669 char ipv6buf[16];\r
670 sk_addrcopy(addr, ipv6buf);\r
671 put_uint16(bs, 6); /* indicates IPv6 */\r
672 put_stringpl_xauth(bs, make_ptrlen(ipv6buf, 16));\r
673 } else {\r
674 unreachable("Bad address type in x11_format_auth_for_authfile");\r
675 }\r
676 \r
677 {\r
678 char *numberbuf = dupprintf("%d", display_no);\r
679 put_stringpl_xauth(bs, ptrlen_from_asciz(numberbuf));\r
680 sfree(numberbuf);\r
681 }\r
682 \r
683 put_stringpl_xauth(bs, authproto);\r
684 put_stringpl_xauth(bs, authdata);\r
685 }\r
686 \r
687 static void x11_log(Plug *p, PlugLogType type, SockAddr *addr, int port,\r
688 const char *error_msg, int error_code)\r
689 {\r
690 /* We have no interface to the logging module here, so we drop these. */\r
691 }\r
692 \r
693 static void x11_send_init_error(struct X11Connection *conn,\r
694 const char *err_message);\r
695 \r
696 static void x11_closing(Plug *plug, const char *error_msg, int error_code,\r
697 bool calling_back)\r
698 {\r
699 struct X11Connection *xconn = container_of(\r
700 plug, struct X11Connection, plug);\r
701 \r
702 if (error_msg) {\r
703 /*\r
704 * Socket error. If we're still at the connection setup stage,\r
705 * construct an X11 error packet passing on the problem.\r
706 */\r
707 if (xconn->no_data_sent_to_x_client) {\r
708 char *err_message = dupprintf("unable to connect to forwarded "\r
709 "X server: %s", error_msg);\r
710 x11_send_init_error(xconn, err_message);\r
711 sfree(err_message);\r
712 }\r
713 \r
714 /*\r
715 * Whether we did that or not, now we slam the connection\r
716 * shut.\r
717 */\r
718 sshfwd_initiate_close(xconn->c, error_msg);\r
719 } else {\r
720 /*\r
721 * Ordinary EOF received on socket. Send an EOF on the SSH\r
722 * channel.\r
723 */\r
724 if (xconn->c)\r
725 sshfwd_write_eof(xconn->c);\r
726 }\r
727 }\r
728 \r
729 static void x11_receive(Plug *plug, int urgent, const char *data, size_t len)\r
730 {\r
731 struct X11Connection *xconn = container_of(\r
732 plug, struct X11Connection, plug);\r
733 \r
734 xconn->no_data_sent_to_x_client = false;\r
735 sshfwd_write(xconn->c, data, len);\r
736 }\r
737 \r
738 static void x11_sent(Plug *plug, size_t bufsize)\r
739 {\r
740 struct X11Connection *xconn = container_of(\r
741 plug, struct X11Connection, plug);\r
742 \r
743 sshfwd_unthrottle(xconn->c, bufsize);\r
744 }\r
745 \r
746 /*\r
747 * When setting up X forwarding, we should send the screen number\r
748 * from the specified local display. This function extracts it from\r
749 * the display string.\r
750 */\r
751 int x11_get_screen_number(char *display)\r
752 {\r
753 int n;\r
754 \r
755 n = host_strcspn(display, ":");\r
756 if (!display[n])\r
757 return 0;\r
758 n = strcspn(display, ".");\r
759 if (!display[n])\r
760 return 0;\r
761 return atoi(display + n + 1);\r
762 }\r
763 \r
764 static const PlugVtable X11Connection_plugvt = {\r
765 .log = x11_log,\r
766 .closing = x11_closing,\r
767 .receive = x11_receive,\r
768 .sent = x11_sent,\r
769 };\r
770 \r
771 static void x11_chan_free(Channel *chan);\r
772 static size_t x11_send(\r
773 Channel *chan, bool is_stderr, const void *vdata, size_t len);\r
774 static void x11_send_eof(Channel *chan);\r
775 static void x11_set_input_wanted(Channel *chan, bool wanted);\r
776 static char *x11_log_close_msg(Channel *chan);\r
777 \r
778 static const ChannelVtable X11Connection_channelvt = {\r
779 .free = x11_chan_free,\r
780 .open_confirmation = chan_remotely_opened_confirmation,\r
781 .open_failed = chan_remotely_opened_failure,\r
782 .send = x11_send,\r
783 .send_eof = x11_send_eof,\r
784 .set_input_wanted = x11_set_input_wanted,\r
785 .log_close_msg = x11_log_close_msg,\r
786 .want_close = chan_default_want_close,\r
787 .rcvd_exit_status = chan_no_exit_status,\r
788 .rcvd_exit_signal = chan_no_exit_signal,\r
789 .rcvd_exit_signal_numeric = chan_no_exit_signal_numeric,\r
790 .run_shell = chan_no_run_shell,\r
791 .run_command = chan_no_run_command,\r
792 .run_subsystem = chan_no_run_subsystem,\r
793 .enable_x11_forwarding = chan_no_enable_x11_forwarding,\r
794 .enable_agent_forwarding = chan_no_enable_agent_forwarding,\r
795 .allocate_pty = chan_no_allocate_pty,\r
796 .set_env = chan_no_set_env,\r
797 .send_break = chan_no_send_break,\r
798 .send_signal = chan_no_send_signal,\r
799 .change_window_size = chan_no_change_window_size,\r
800 .request_response = chan_no_request_response,\r
801 };\r
802 \r
803 /*\r
804 * Called to set up the X11Connection structure, though this does not\r
805 * yet connect to an actual server.\r
806 */\r
807 Channel *x11_new_channel(tree234 *authtree, SshChannel *c,\r
808 const char *peeraddr, int peerport,\r
809 bool connection_sharing_possible)\r
810 {\r
811 struct X11Connection *xconn;\r
812 \r
813 /*\r
814 * Open socket.\r
815 */\r
816 xconn = snew(struct X11Connection);\r
817 xconn->plug.vt = &X11Connection_plugvt;\r
818 xconn->chan.vt = &X11Connection_channelvt;\r
819 xconn->chan.initial_fixed_window_size =\r
820 (connection_sharing_possible ? 128 : 0);\r
821 xconn->auth_protocol = NULL;\r
822 xconn->authtree = authtree;\r
823 xconn->verified = false;\r
824 xconn->data_read = 0;\r
825 xconn->input_wanted = true;\r
826 xconn->no_data_sent_to_x_client = true;\r
827 xconn->c = c;\r
828 \r
829 /*\r
830 * We don't actually open a local socket to the X server just yet,\r
831 * because we don't know which one it is. Instead, we'll wait\r
832 * until we see the incoming authentication data, which may tell\r
833 * us what display to connect to, or whether we have to divert\r
834 * this X forwarding channel to a connection-sharing downstream\r
835 * rather than handling it ourself.\r
836 */\r
837 xconn->disp = NULL;\r
838 xconn->s = NULL;\r
839 \r
840 /*\r
841 * Stash the peer address we were given in its original text form.\r
842 */\r
843 xconn->peer_addr = peeraddr ? dupstr(peeraddr) : NULL;\r
844 xconn->peer_port = peerport;\r
845 \r
846 return &xconn->chan;\r
847 }\r
848 \r
849 static void x11_chan_free(Channel *chan)\r
850 {\r
851 assert(chan->vt == &X11Connection_channelvt);\r
852 X11Connection *xconn = container_of(chan, X11Connection, chan);\r
853 \r
854 if (xconn->auth_protocol) {\r
855 sfree(xconn->auth_protocol);\r
856 sfree(xconn->auth_data);\r
857 }\r
858 \r
859 if (xconn->s)\r
860 sk_close(xconn->s);\r
861 \r
862 sfree(xconn->peer_addr);\r
863 sfree(xconn);\r
864 }\r
865 \r
866 static void x11_set_input_wanted(Channel *chan, bool wanted)\r
867 {\r
868 assert(chan->vt == &X11Connection_channelvt);\r
869 X11Connection *xconn = container_of(chan, X11Connection, chan);\r
870 \r
871 xconn->input_wanted = wanted;\r
872 if (xconn->s)\r
873 sk_set_frozen(xconn->s, !xconn->input_wanted);\r
874 }\r
875 \r
876 static void x11_send_init_error(struct X11Connection *xconn,\r
877 const char *err_message)\r
878 {\r
879 char *full_message;\r
880 int msglen, msgsize;\r
881 unsigned char *reply;\r
882 \r
883 full_message = dupprintf("%s X11 proxy: %s\n", appname, err_message);\r
884 \r
885 msglen = strlen(full_message);\r
886 reply = snewn(8 + msglen+1 + 4, unsigned char); /* include zero */\r
887 msgsize = (msglen + 3) & ~3;\r
888 reply[0] = 0; /* failure */\r
889 reply[1] = msglen; /* length of reason string */\r
890 memcpy(reply + 2, xconn->firstpkt + 2, 4); /* major/minor proto vsn */\r
891 PUT_16BIT_X11(xconn->firstpkt[0], reply + 6, msgsize >> 2);/* data len */\r
892 memset(reply + 8, 0, msgsize);\r
893 memcpy(reply + 8, full_message, msglen);\r
894 sshfwd_write(xconn->c, reply, 8 + msgsize);\r
895 sshfwd_write_eof(xconn->c);\r
896 xconn->no_data_sent_to_x_client = false;\r
897 sfree(reply);\r
898 sfree(full_message);\r
899 }\r
900 \r
901 static bool x11_parse_ip(const char *addr_string, unsigned long *ip)\r
902 {\r
903 \r
904 /*\r
905 * See if we can make sense of this string as an IPv4 address, for\r
906 * XDM-AUTHORIZATION-1 purposes.\r
907 */\r
908 int i[4];\r
909 if (addr_string &&\r
910 4 == sscanf(addr_string, "%d.%d.%d.%d", i+0, i+1, i+2, i+3)) {\r
911 *ip = (i[0] << 24) | (i[1] << 16) | (i[2] << 8) | i[3];\r
912 return true;\r
913 } else {\r
914 return false;\r
915 }\r
916 }\r
917 \r
918 /*\r
919 * Called to send data down the raw connection.\r
920 */\r
921 static size_t x11_send(\r
922 Channel *chan, bool is_stderr, const void *vdata, size_t len)\r
923 {\r
924 assert(chan->vt == &X11Connection_channelvt);\r
925 X11Connection *xconn = container_of(chan, X11Connection, chan);\r
926 const char *data = (const char *)vdata;\r
927 \r
928 /*\r
929 * Read the first packet.\r
930 */\r
931 while (len > 0 && xconn->data_read < 12)\r
932 xconn->firstpkt[xconn->data_read++] = (unsigned char) (len--, *data++);\r
933 if (xconn->data_read < 12)\r
934 return 0;\r
935 \r
936 /*\r
937 * If we have not allocated the auth_protocol and auth_data\r
938 * strings, do so now.\r
939 */\r
940 if (!xconn->auth_protocol) {\r
941 char endian = xconn->firstpkt[0];\r
942 xconn->auth_plen = GET_16BIT_X11(endian, xconn->firstpkt + 6);\r
943 xconn->auth_dlen = GET_16BIT_X11(endian, xconn->firstpkt + 8);\r
944 xconn->auth_psize = (xconn->auth_plen + 3) & ~3;\r
945 xconn->auth_dsize = (xconn->auth_dlen + 3) & ~3;\r
946 /* Leave room for a terminating zero, to make our lives easier. */\r
947 xconn->auth_protocol = snewn(xconn->auth_psize + 1, char);\r
948 xconn->auth_data = snewn(xconn->auth_dsize, unsigned char);\r
949 }\r
950 \r
951 /*\r
952 * Read the auth_protocol and auth_data strings.\r
953 */\r
954 while (len > 0 &&\r
955 xconn->data_read < 12 + xconn->auth_psize)\r
956 xconn->auth_protocol[xconn->data_read++ - 12] = (len--, *data++);\r
957 while (len > 0 &&\r
958 xconn->data_read < 12 + xconn->auth_psize + xconn->auth_dsize)\r
959 xconn->auth_data[xconn->data_read++ - 12 -\r
960 xconn->auth_psize] = (unsigned char) (len--, *data++);\r
961 if (xconn->data_read < 12 + xconn->auth_psize + xconn->auth_dsize)\r
962 return 0;\r
963 \r
964 /*\r
965 * If we haven't verified the authorisation, do so now.\r
966 */\r
967 if (!xconn->verified) {\r
968 const char *err;\r
969 struct X11FakeAuth *auth_matched = NULL;\r
970 unsigned long peer_ip;\r
971 int peer_port;\r
972 int protomajor, protominor;\r
973 void *greeting;\r
974 int greeting_len;\r
975 unsigned char *socketdata;\r
976 int socketdatalen;\r
977 char new_peer_addr[32];\r
978 int new_peer_port;\r
979 char endian = xconn->firstpkt[0];\r
980 \r
981 protomajor = GET_16BIT_X11(endian, xconn->firstpkt + 2);\r
982 protominor = GET_16BIT_X11(endian, xconn->firstpkt + 4);\r
983 \r
984 assert(!xconn->s);\r
985 \r
986 xconn->auth_protocol[xconn->auth_plen] = '\0'; /* ASCIZ */\r
987 \r
988 peer_ip = 0; /* placate optimiser */\r
989 if (x11_parse_ip(xconn->peer_addr, &peer_ip))\r
990 peer_port = xconn->peer_port;\r
991 else\r
992 peer_port = -1; /* signal no peer address data available */\r
993 \r
994 err = x11_verify(peer_ip, peer_port,\r
995 xconn->authtree, xconn->auth_protocol,\r
996 xconn->auth_data, xconn->auth_dlen, &auth_matched);\r
997 if (err) {\r
998 x11_send_init_error(xconn, err);\r
999 return 0;\r
1000 }\r
1001 assert(auth_matched);\r
1002 \r
1003 /*\r
1004 * If this auth points to a connection-sharing downstream\r
1005 * rather than an X display we know how to connect to\r
1006 * directly, pass it off to the sharing module now. (This will\r
1007 * have the side effect of freeing xconn.)\r
1008 */\r
1009 if (auth_matched->share_cs) {\r
1010 sshfwd_x11_sharing_handover(xconn->c, auth_matched->share_cs,\r
1011 auth_matched->share_chan,\r
1012 xconn->peer_addr, xconn->peer_port,\r
1013 xconn->firstpkt[0],\r
1014 protomajor, protominor, data, len);\r
1015 return 0;\r
1016 }\r
1017 \r
1018 /*\r
1019 * Now we know we're going to accept the connection, and what\r
1020 * X display to connect to. Actually connect to it.\r
1021 */\r
1022 xconn->chan.initial_fixed_window_size = 0;\r
1023 sshfwd_window_override_removed(xconn->c);\r
1024 xconn->disp = auth_matched->disp;\r
1025 xconn->s = new_connection(sk_addr_dup(xconn->disp->addr),\r
1026 xconn->disp->realhost, xconn->disp->port,\r
1027 false, true, false, false, &xconn->plug,\r
1028 sshfwd_get_conf(xconn->c));\r
1029 if ((err = sk_socket_error(xconn->s)) != NULL) {\r
1030 char *err_message = dupprintf("unable to connect to"\r
1031 " forwarded X server: %s", err);\r
1032 x11_send_init_error(xconn, err_message);\r
1033 sfree(err_message);\r
1034 return 0;\r
1035 }\r
1036 \r
1037 /*\r
1038 * Write a new connection header containing our replacement\r
1039 * auth data.\r
1040 */\r
1041 socketdatalen = 0; /* placate compiler warning */\r
1042 socketdata = sk_getxdmdata(xconn->s, &socketdatalen);\r
1043 if (socketdata && socketdatalen==6) {\r
1044 sprintf(new_peer_addr, "%d.%d.%d.%d", socketdata[0],\r
1045 socketdata[1], socketdata[2], socketdata[3]);\r
1046 new_peer_port = GET_16BIT_MSB_FIRST(socketdata + 4);\r
1047 } else {\r
1048 strcpy(new_peer_addr, "0.0.0.0");\r
1049 new_peer_port = 0;\r
1050 }\r
1051 \r
1052 greeting = x11_make_greeting(xconn->firstpkt[0],\r
1053 protomajor, protominor,\r
1054 xconn->disp->localauthproto,\r
1055 xconn->disp->localauthdata,\r
1056 xconn->disp->localauthdatalen,\r
1057 new_peer_addr, new_peer_port,\r
1058 &greeting_len);\r
1059 \r
1060 sk_write(xconn->s, greeting, greeting_len);\r
1061 \r
1062 smemclr(greeting, greeting_len);\r
1063 sfree(greeting);\r
1064 \r
1065 /*\r
1066 * Now we're done.\r
1067 */\r
1068 xconn->verified = true;\r
1069 }\r
1070 \r
1071 /*\r
1072 * After initialisation, just copy data simply.\r
1073 */\r
1074 \r
1075 return sk_write(xconn->s, data, len);\r
1076 }\r
1077 \r
1078 static void x11_send_eof(Channel *chan)\r
1079 {\r
1080 assert(chan->vt == &X11Connection_channelvt);\r
1081 X11Connection *xconn = container_of(chan, X11Connection, chan);\r
1082 \r
1083 if (xconn->s) {\r
1084 sk_write_eof(xconn->s);\r
1085 } else {\r
1086 /*\r
1087 * If EOF is received from the X client before we've got to\r
1088 * the point of actually connecting to an X server, then we\r
1089 * should send an EOF back to the client so that the\r
1090 * forwarded channel will be terminated.\r
1091 */\r
1092 if (xconn->c)\r
1093 sshfwd_write_eof(xconn->c);\r
1094 }\r
1095 }\r
1096 \r
1097 static char *x11_log_close_msg(Channel *chan)\r
1098 {\r
1099 return dupstr("Forwarded X11 connection terminated");\r
1100 }\r
1101 \r
1102 /*\r
1103 * Utility functions used by connection sharing to convert textual\r
1104 * representations of an X11 auth protocol name + hex cookie into our\r
1105 * usual integer protocol id and binary auth data.\r
1106 */\r
1107 int x11_identify_auth_proto(ptrlen protoname)\r
1108 {\r
1109 int protocol;\r
1110 \r
1111 for (protocol = 1; protocol < lenof(x11_authnames); protocol++)\r
1112 if (ptrlen_eq_string(protoname, x11_authnames[protocol]))\r
1113 return protocol;\r
1114 return -1;\r
1115 }\r
1116 \r
1117 void *x11_dehexify(ptrlen hexpl, int *outlen)\r
1118 {\r
1119 int len, i;\r
1120 unsigned char *ret;\r
1121 \r
1122 len = hexpl.len / 2;\r
1123 ret = snewn(len, unsigned char);\r
1124 \r
1125 for (i = 0; i < len; i++) {\r
1126 char bytestr[3];\r
1127 unsigned val = 0;\r
1128 bytestr[0] = ((const char *)hexpl.ptr)[2*i];\r
1129 bytestr[1] = ((const char *)hexpl.ptr)[2*i+1];\r
1130 bytestr[2] = '\0';\r
1131 sscanf(bytestr, "%x", &val);\r
1132 ret[i] = val;\r
1133 }\r
1134 \r
1135 *outlen = len;\r
1136 return ret;\r
1137 }\r
1138 \r
1139 /*\r
1140 * Construct an X11 greeting packet, including making up the right\r
1141 * authorisation data.\r
1142 */\r
1143 void *x11_make_greeting(int endian, int protomajor, int protominor,\r
1144 int auth_proto, const void *auth_data, int auth_len,\r
1145 const char *peer_addr, int peer_port,\r
1146 int *outlen)\r
1147 {\r
1148 unsigned char *greeting;\r
1149 unsigned char realauthdata[64];\r
1150 const char *authname;\r
1151 const unsigned char *authdata;\r
1152 int authnamelen, authnamelen_pad;\r
1153 int authdatalen, authdatalen_pad;\r
1154 int greeting_len;\r
1155 \r
1156 authname = x11_authnames[auth_proto];\r
1157 authnamelen = strlen(authname);\r
1158 authnamelen_pad = (authnamelen + 3) & ~3;\r
1159 \r
1160 if (auth_proto == X11_MIT) {\r
1161 authdata = auth_data;\r
1162 authdatalen = auth_len;\r
1163 } else if (auth_proto == X11_XDM && auth_len == 16) {\r
1164 time_t t;\r
1165 unsigned long peer_ip = 0;\r
1166 \r
1167 x11_parse_ip(peer_addr, &peer_ip);\r
1168 \r
1169 authdata = realauthdata;\r
1170 authdatalen = 24;\r
1171 memset(realauthdata, 0, authdatalen);\r
1172 memcpy(realauthdata, auth_data, 8);\r
1173 PUT_32BIT_MSB_FIRST(realauthdata+8, peer_ip);\r
1174 PUT_16BIT_MSB_FIRST(realauthdata+12, peer_port);\r
1175 t = time(NULL);\r
1176 PUT_32BIT_MSB_FIRST(realauthdata+14, t);\r
1177 \r
1178 des_encrypt_xdmauth((char *)auth_data + 9, realauthdata, authdatalen);\r
1179 } else {\r
1180 authdata = realauthdata;\r
1181 authdatalen = 0;\r
1182 }\r
1183 \r
1184 authdatalen_pad = (authdatalen + 3) & ~3;\r
1185 greeting_len = 12 + authnamelen_pad + authdatalen_pad;\r
1186 \r
1187 greeting = snewn(greeting_len, unsigned char);\r
1188 memset(greeting, 0, greeting_len);\r
1189 greeting[0] = endian;\r
1190 PUT_16BIT_X11(endian, greeting+2, protomajor);\r
1191 PUT_16BIT_X11(endian, greeting+4, protominor);\r
1192 PUT_16BIT_X11(endian, greeting+6, authnamelen);\r
1193 PUT_16BIT_X11(endian, greeting+8, authdatalen);\r
1194 memcpy(greeting+12, authname, authnamelen);\r
1195 memcpy(greeting+12+authnamelen_pad, authdata, authdatalen);\r
1196 \r
1197 smemclr(realauthdata, sizeof(realauthdata));\r
1198 \r
1199 *outlen = greeting_len;\r
1200 return greeting;\r
1201 }\r