46ed7b64 |
1 | /* |
2 | * Platform-independent bits of X11 forwarding. |
3 | */ |
4 | |
9c964e85 |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
e0e7dff8 |
7 | #include <assert.h> |
2f92b717 |
8 | #include <time.h> |
9c964e85 |
9 | |
10 | #include "putty.h" |
11 | #include "ssh.h" |
5f8ff48c |
12 | #include "tree234.h" |
9c964e85 |
13 | |
9c964e85 |
14 | #define GET_16BIT(endian, cp) \ |
15 | (endian=='B' ? GET_16BIT_MSB_FIRST(cp) : GET_16BIT_LSB_FIRST(cp)) |
16 | |
17 | #define PUT_16BIT(endian, cp, val) \ |
18 | (endian=='B' ? PUT_16BIT_MSB_FIRST(cp, val) : PUT_16BIT_LSB_FIRST(cp, val)) |
19 | |
e0e7dff8 |
20 | const char *const x11_authnames[] = { |
2f92b717 |
21 | "", "MIT-MAGIC-COOKIE-1", "XDM-AUTHORIZATION-1" |
e0e7dff8 |
22 | }; |
23 | |
5f8ff48c |
24 | struct XDMSeen { |
25 | unsigned int time; |
26 | unsigned char clientid[6]; |
27 | }; |
28 | |
302121de |
29 | struct X11Auth { |
e0e7dff8 |
30 | unsigned char fakedata[64], realdata[64]; |
31 | int fakeproto, realproto; |
32 | int fakelen, reallen; |
5f8ff48c |
33 | tree234 *xdmseen; |
302121de |
34 | }; |
35 | |
9c964e85 |
36 | struct X11Private { |
302121de |
37 | const struct plug_function_table *fn; |
7e78000d |
38 | /* the above variable absolutely *must* be the first in this structure */ |
32874aea |
39 | unsigned char firstpkt[12]; /* first X data packet */ |
302121de |
40 | struct X11Auth *auth; |
9c964e85 |
41 | char *auth_protocol; |
42 | unsigned char *auth_data; |
43 | int data_read, auth_plen, auth_psize, auth_dlen, auth_dsize; |
44 | int verified; |
5471d09a |
45 | int throttled, throttle_override; |
b3ebaa28 |
46 | unsigned long peer_ip; |
47 | int peer_port; |
32874aea |
48 | void *c; /* data used by ssh.c */ |
7e78000d |
49 | Socket s; |
9c964e85 |
50 | }; |
51 | |
5f8ff48c |
52 | static int xdmseen_cmp(void *a, void *b) |
53 | { |
54 | struct XDMSeen *sa = a, *sb = b; |
55 | return sa->time > sb->time ? 1 : |
56 | sa->time < sb->time ? -1 : |
57 | memcmp(sa->clientid, sb->clientid, sizeof(sa->clientid)); |
58 | } |
59 | |
302121de |
60 | void *x11_invent_auth(char *proto, int protomaxlen, |
b3ebaa28 |
61 | char *data, int datamaxlen, int proto_id) |
32874aea |
62 | { |
3d88e64d |
63 | struct X11Auth *auth = snew(struct X11Auth); |
9c964e85 |
64 | char ourdata[64]; |
65 | int i; |
66 | |
b3ebaa28 |
67 | if (proto_id == X11_MIT) { |
68 | auth->fakeproto = X11_MIT; |
e0e7dff8 |
69 | |
b3ebaa28 |
70 | /* MIT-MAGIC-COOKIE-1. Cookie size is 128 bits (16 bytes). */ |
71 | auth->fakelen = 16; |
72 | for (i = 0; i < 16; i++) |
73 | auth->fakedata[i] = random_byte(); |
537e9567 |
74 | auth->xdmseen = NULL; |
b3ebaa28 |
75 | } else { |
76 | assert(proto_id == X11_XDM); |
77 | auth->fakeproto = X11_XDM; |
78 | |
79 | /* XDM-AUTHORIZATION-1. Cookie size is 16 bytes; byte 8 is zero. */ |
80 | auth->fakelen = 16; |
81 | for (i = 0; i < 16; i++) |
82 | auth->fakedata[i] = (i == 8 ? 0 : random_byte()); |
5f8ff48c |
83 | auth->xdmseen = newtree234(xdmseen_cmp); |
b3ebaa28 |
84 | } |
9c964e85 |
85 | |
86 | /* Now format for the recipient. */ |
e0e7dff8 |
87 | strncpy(proto, x11_authnames[auth->fakeproto], protomaxlen); |
9c964e85 |
88 | ourdata[0] = '\0'; |
e0e7dff8 |
89 | for (i = 0; i < auth->fakelen; i++) |
90 | sprintf(ourdata + strlen(ourdata), "%02x", auth->fakedata[i]); |
9c964e85 |
91 | strncpy(data, ourdata, datamaxlen); |
302121de |
92 | |
93 | return auth; |
9c964e85 |
94 | } |
95 | |
5f8ff48c |
96 | void x11_free_auth(void *authv) |
fabd1805 |
97 | { |
5f8ff48c |
98 | struct X11Auth *auth = (struct X11Auth *)authv; |
99 | struct XDMSeen *seen; |
fabd1805 |
100 | |
5f8ff48c |
101 | if (auth->xdmseen != NULL) { |
102 | while ((seen = delpos234(auth->xdmseen, 0)) != NULL) |
103 | sfree(seen); |
104 | freetree234(auth->xdmseen); |
105 | } |
fabd1805 |
106 | sfree(auth); |
107 | } |
108 | |
e0e7dff8 |
109 | /* |
110 | * Fetch the real auth data for a given display string, and store |
111 | * it in an X11Auth structure. Returns NULL on success, or an error |
112 | * string. |
113 | */ |
114 | void x11_get_real_auth(void *authv, char *display) |
115 | { |
116 | struct X11Auth *auth = (struct X11Auth *)authv; |
117 | |
118 | auth->realproto = X11_NO_AUTH; /* in case next call does nothing */ |
119 | |
120 | auth->reallen = sizeof(auth->realdata); |
121 | platform_get_x11_auth(display, &auth->realproto, |
122 | auth->realdata, &auth->reallen); |
123 | } |
124 | |
5f8ff48c |
125 | #define XDM_MAXSKEW 20*60 /* 20 minute clock skew should be OK */ |
126 | |
b3ebaa28 |
127 | static char *x11_verify(unsigned long peer_ip, int peer_port, |
128 | struct X11Auth *auth, char *proto, |
129 | unsigned char *data, int dlen) |
32874aea |
130 | { |
e0e7dff8 |
131 | if (strcmp(proto, x11_authnames[auth->fakeproto]) != 0) |
b3ebaa28 |
132 | return "wrong authentication protocol attempted"; |
e0e7dff8 |
133 | if (auth->fakeproto == X11_MIT) { |
134 | if (dlen != auth->fakelen) |
b3ebaa28 |
135 | return "MIT-MAGIC-COOKIE-1 data was wrong length"; |
e0e7dff8 |
136 | if (memcmp(auth->fakedata, data, dlen) != 0) |
b3ebaa28 |
137 | return "MIT-MAGIC-COOKIE-1 data did not match"; |
138 | } |
139 | if (auth->fakeproto == X11_XDM) { |
140 | unsigned long t; |
141 | time_t tim; |
142 | int i; |
5f8ff48c |
143 | struct XDMSeen *seen, *ret; |
b3ebaa28 |
144 | |
145 | if (dlen != 24) |
146 | return "XDM-AUTHORIZATION-1 data was wrong length"; |
147 | if (peer_port == -1) |
148 | return "cannot do XDM-AUTHORIZATION-1 without remote address data"; |
149 | des_decrypt_xdmauth(auth->fakedata+9, data, 24); |
150 | if (memcmp(auth->fakedata, data, 8) != 0) |
151 | return "XDM-AUTHORIZATION-1 data failed check"; /* cookie wrong */ |
152 | if (GET_32BIT_MSB_FIRST(data+8) != peer_ip) |
153 | return "XDM-AUTHORIZATION-1 data failed check"; /* IP wrong */ |
154 | if ((int)GET_16BIT_MSB_FIRST(data+12) != peer_port) |
155 | return "XDM-AUTHORIZATION-1 data failed check"; /* port wrong */ |
156 | t = GET_32BIT_MSB_FIRST(data+14); |
157 | for (i = 18; i < 24; i++) |
158 | if (data[i] != 0) /* zero padding wrong */ |
159 | return "XDM-AUTHORIZATION-1 data failed check"; |
160 | tim = time(NULL); |
5f8ff48c |
161 | if (abs(t - tim) > XDM_MAXSKEW) |
b3ebaa28 |
162 | return "XDM-AUTHORIZATION-1 time stamp was too far out"; |
5f8ff48c |
163 | seen = snew(struct XDMSeen); |
164 | seen->time = t; |
165 | memcpy(seen->clientid, data+8, 6); |
166 | assert(auth->xdmseen != NULL); |
167 | ret = add234(auth->xdmseen, seen); |
168 | if (ret != seen) { |
169 | sfree(seen); |
170 | return "XDM-AUTHORIZATION-1 data replayed"; |
171 | } |
172 | /* While we're here, purge entries too old to be replayed. */ |
173 | for (;;) { |
174 | seen = index234(auth->xdmseen, 0); |
175 | assert(seen != NULL); |
176 | if (t - seen->time <= XDM_MAXSKEW) |
177 | break; |
178 | sfree(delpos234(auth->xdmseen, 0)); |
179 | } |
e0e7dff8 |
180 | } |
181 | /* implement other protocols here if ever required */ |
b3ebaa28 |
182 | return NULL; |
9c964e85 |
183 | } |
184 | |
7555d6a5 |
185 | static void x11_log(Plug p, int type, SockAddr addr, int port, |
186 | const char *error_msg, int error_code) |
187 | { |
188 | /* We have no interface to the logging module here, so we drop these. */ |
189 | } |
190 | |
cbe2d68f |
191 | static int x11_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
192 | int calling_back) |
193 | { |
7e78000d |
194 | struct X11Private *pr = (struct X11Private *) plug; |
195 | |
196 | /* |
197 | * We have no way to communicate down the forwarded connection, |
198 | * so if an error occurred on the socket, we just ignore it |
199 | * and treat it like a proper close. |
200 | */ |
201 | sshfwd_close(pr->c); |
202 | x11_close(pr->s); |
203 | return 1; |
204 | } |
205 | |
32874aea |
206 | static int x11_receive(Plug plug, int urgent, char *data, int len) |
207 | { |
7e78000d |
208 | struct X11Private *pr = (struct X11Private *) plug; |
9c964e85 |
209 | |
5471d09a |
210 | if (sshfwd_write(pr->c, data, len) > 0) { |
211 | pr->throttled = 1; |
212 | sk_set_frozen(pr->s, 1); |
213 | } |
214 | |
9c964e85 |
215 | return 1; |
216 | } |
217 | |
5471d09a |
218 | static void x11_sent(Plug plug, int bufsize) |
219 | { |
220 | struct X11Private *pr = (struct X11Private *) plug; |
221 | |
222 | sshfwd_unthrottle(pr->c, bufsize); |
223 | } |
224 | |
9c964e85 |
225 | /* |
421d6835 |
226 | * When setting up X forwarding, we should send the screen number |
227 | * from the specified local display. This function extracts it from |
228 | * the display string. |
229 | */ |
230 | int x11_get_screen_number(char *display) |
231 | { |
232 | int n; |
233 | |
234 | n = strcspn(display, ":"); |
235 | if (!display[n]) |
236 | return 0; |
237 | n = strcspn(display, "."); |
238 | if (!display[n]) |
239 | return 0; |
240 | return atoi(display + n + 1); |
241 | } |
242 | |
fc0f17db |
243 | /* Find the right display, returns an allocated string */ |
244 | char *x11_display(const char *display) { |
46ed7b64 |
245 | char *ret; |
246 | if(!display || !*display) { |
247 | /* try to find platform-specific local display */ |
11a60120 |
248 | if((ret = platform_get_x_display())==0) |
46ed7b64 |
249 | /* plausible default for all platforms */ |
250 | ret = dupstr(":0"); |
251 | } else |
252 | ret = dupstr(display); |
253 | if(ret[0] == ':') { |
fc0f17db |
254 | /* no transport specified, use whatever we think is best */ |
0ca70bfc |
255 | char *s = dupcat(platform_x11_best_transport, ret, (char *)0); |
46ed7b64 |
256 | sfree(ret); |
257 | return s; |
fc0f17db |
258 | } else |
46ed7b64 |
259 | return ret; |
fc0f17db |
260 | } |
261 | |
421d6835 |
262 | /* |
9c964e85 |
263 | * Called to set up the raw connection. |
264 | * |
265 | * Returns an error message, or NULL on success. |
266 | * also, fills the SocketsStructure |
9c964e85 |
267 | */ |
cbe2d68f |
268 | const char *x11_init(Socket * s, char *display, void *c, void *auth, |
269 | const char *peeraddr, int peerport, const Config *cfg) |
32874aea |
270 | { |
302121de |
271 | static const struct plug_function_table fn_table = { |
7555d6a5 |
272 | x11_log, |
7e78000d |
273 | x11_closing, |
5471d09a |
274 | x11_receive, |
275 | x11_sent, |
276 | NULL |
7e78000d |
277 | }; |
278 | |
9c964e85 |
279 | SockAddr addr; |
280 | int port; |
cbe2d68f |
281 | const char *err; |
282 | char *dummy_realhost; |
9c964e85 |
283 | char host[128]; |
284 | int n, displaynum; |
285 | struct X11Private *pr; |
286 | |
fc0f17db |
287 | /* default display */ |
288 | display = x11_display(display); |
9c964e85 |
289 | /* |
290 | * Split up display name into host and display-number parts. |
291 | */ |
292 | n = strcspn(display, ":"); |
fc0f17db |
293 | assert(n != 0); /* x11_display() promises this */ |
9c964e85 |
294 | if (display[n]) |
32874aea |
295 | displaynum = atoi(display + n + 1); |
9c964e85 |
296 | else |
32874aea |
297 | displaynum = 0; /* sensible default */ |
298 | if (n > sizeof(host) - 1) |
299 | n = sizeof(host) - 1; |
fc0f17db |
300 | strncpy(host, display, n); |
301 | host[n] = '\0'; |
302 | sfree(display); |
303 | |
304 | if(!strcmp(host, "unix")) { |
305 | /* use AF_UNIX sockets (doesn't make sense on all platforms) */ |
306 | addr = platform_get_x11_unix_address(displaynum, |
307 | &dummy_realhost); |
308 | port = 0; /* to show we are not confused */ |
ecc0ba5b |
309 | } else { |
fc0f17db |
310 | port = 6000 + displaynum; |
311 | |
ecc0ba5b |
312 | /* |
fc0f17db |
313 | * Try to find host. |
ecc0ba5b |
314 | */ |
05581745 |
315 | addr = name_lookup(host, port, &dummy_realhost, cfg, ADDRTYPE_UNSPEC); |
fc0f17db |
316 | if ((err = sk_addr_error(addr)) != NULL) { |
317 | sk_addr_free(addr); |
318 | return err; |
319 | } |
f85e6f6e |
320 | } |
9c964e85 |
321 | |
9c964e85 |
322 | /* |
323 | * Open socket. |
324 | */ |
3d88e64d |
325 | pr = snew(struct X11Private); |
7e78000d |
326 | pr->fn = &fn_table; |
9c964e85 |
327 | pr->auth_protocol = NULL; |
302121de |
328 | pr->auth = (struct X11Auth *)auth; |
9c964e85 |
329 | pr->verified = 0; |
330 | pr->data_read = 0; |
5471d09a |
331 | pr->throttled = pr->throttle_override = 0; |
9c964e85 |
332 | pr->c = c; |
333 | |
e8fa8f62 |
334 | pr->s = *s = new_connection(addr, dummy_realhost, port, |
79bf227b |
335 | 0, 1, 0, 0, (Plug) pr, cfg); |
6518ea7b |
336 | if ((err = sk_socket_error(*s)) != NULL) { |
32874aea |
337 | sfree(pr); |
7e78000d |
338 | return err; |
339 | } |
340 | |
b3ebaa28 |
341 | /* |
342 | * See if we can make sense of the peer address we were given. |
343 | */ |
344 | { |
345 | int i[4]; |
346 | if (peeraddr && |
347 | 4 == sscanf(peeraddr, "%d.%d.%d.%d", i+0, i+1, i+2, i+3)) { |
348 | pr->peer_ip = (i[0] << 24) | (i[1] << 16) | (i[2] << 8) | i[3]; |
349 | pr->peer_port = peerport; |
350 | } else { |
351 | pr->peer_ip = 0; |
352 | pr->peer_port = -1; |
353 | } |
354 | } |
355 | |
9c964e85 |
356 | sk_set_private_ptr(*s, pr); |
9c964e85 |
357 | return NULL; |
358 | } |
359 | |
32874aea |
360 | void x11_close(Socket s) |
361 | { |
362 | struct X11Private *pr; |
d74d141c |
363 | if (!s) |
364 | return; |
365 | pr = (struct X11Private *) sk_get_private_ptr(s); |
9c964e85 |
366 | if (pr->auth_protocol) { |
32874aea |
367 | sfree(pr->auth_protocol); |
368 | sfree(pr->auth_data); |
9c964e85 |
369 | } |
370 | |
371 | sfree(pr); |
372 | |
373 | sk_close(s); |
374 | } |
375 | |
5471d09a |
376 | void x11_unthrottle(Socket s) |
377 | { |
378 | struct X11Private *pr; |
379 | if (!s) |
380 | return; |
381 | pr = (struct X11Private *) sk_get_private_ptr(s); |
382 | |
383 | pr->throttled = 0; |
384 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
385 | } |
386 | |
387 | void x11_override_throttle(Socket s, int enable) |
388 | { |
389 | struct X11Private *pr; |
390 | if (!s) |
391 | return; |
392 | pr = (struct X11Private *) sk_get_private_ptr(s); |
393 | |
394 | pr->throttle_override = enable; |
395 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
396 | } |
397 | |
9c964e85 |
398 | /* |
399 | * Called to send data down the raw connection. |
400 | */ |
5471d09a |
401 | int x11_send(Socket s, char *data, int len) |
32874aea |
402 | { |
970f2b02 |
403 | struct X11Private *pr; |
404 | if (!s) |
5471d09a |
405 | return 0; |
970f2b02 |
406 | pr = (struct X11Private *) sk_get_private_ptr(s); |
9c964e85 |
407 | |
408 | /* |
409 | * Read the first packet. |
410 | */ |
411 | while (len > 0 && pr->data_read < 12) |
32874aea |
412 | pr->firstpkt[pr->data_read++] = (unsigned char) (len--, *data++); |
9c964e85 |
413 | if (pr->data_read < 12) |
5471d09a |
414 | return 0; |
9c964e85 |
415 | |
416 | /* |
417 | * If we have not allocated the auth_protocol and auth_data |
418 | * strings, do so now. |
419 | */ |
420 | if (!pr->auth_protocol) { |
32874aea |
421 | pr->auth_plen = GET_16BIT(pr->firstpkt[0], pr->firstpkt + 6); |
422 | pr->auth_dlen = GET_16BIT(pr->firstpkt[0], pr->firstpkt + 8); |
423 | pr->auth_psize = (pr->auth_plen + 3) & ~3; |
424 | pr->auth_dsize = (pr->auth_dlen + 3) & ~3; |
425 | /* Leave room for a terminating zero, to make our lives easier. */ |
3d88e64d |
426 | pr->auth_protocol = snewn(pr->auth_psize + 1, char); |
92d60585 |
427 | pr->auth_data = snewn(pr->auth_dsize, unsigned char); |
9c964e85 |
428 | } |
429 | |
430 | /* |
431 | * Read the auth_protocol and auth_data strings. |
432 | */ |
433 | while (len > 0 && pr->data_read < 12 + pr->auth_psize) |
32874aea |
434 | pr->auth_protocol[pr->data_read++ - 12] = (len--, *data++); |
9c964e85 |
435 | while (len > 0 && pr->data_read < 12 + pr->auth_psize + pr->auth_dsize) |
32874aea |
436 | pr->auth_data[pr->data_read++ - 12 - |
437 | pr->auth_psize] = (unsigned char) (len--, *data++); |
9c964e85 |
438 | if (pr->data_read < 12 + pr->auth_psize + pr->auth_dsize) |
5471d09a |
439 | return 0; |
9c964e85 |
440 | |
441 | /* |
442 | * If we haven't verified the authentication, do so now. |
443 | */ |
444 | if (!pr->verified) { |
b3ebaa28 |
445 | char *err; |
32874aea |
446 | |
447 | pr->auth_protocol[pr->auth_plen] = '\0'; /* ASCIZ */ |
b3ebaa28 |
448 | err = x11_verify(pr->peer_ip, pr->peer_port, |
449 | pr->auth, pr->auth_protocol, |
302121de |
450 | pr->auth_data, pr->auth_dlen); |
32874aea |
451 | |
452 | /* |
453 | * If authentication failed, construct and send an error |
454 | * packet, then terminate the connection. |
455 | */ |
b3ebaa28 |
456 | if (err) { |
457 | char *message; |
458 | int msglen, msgsize; |
459 | unsigned char *reply; |
460 | |
461 | message = dupprintf("PuTTY X11 proxy: %s", err); |
462 | msglen = strlen(message); |
3d88e64d |
463 | reply = snewn(8 + msglen+1 + 4, unsigned char); /* include zero */ |
b3ebaa28 |
464 | msgsize = (msglen + 3) & ~3; |
32874aea |
465 | reply[0] = 0; /* failure */ |
466 | reply[1] = msglen; /* length of reason string */ |
467 | memcpy(reply + 2, pr->firstpkt + 2, 4); /* major/minor proto vsn */ |
75105663 |
468 | PUT_16BIT(pr->firstpkt[0], reply + 6, msgsize >> 2);/* data len */ |
32874aea |
469 | memset(reply + 8, 0, msgsize); |
470 | memcpy(reply + 8, message, msglen); |
f28e6b7c |
471 | sshfwd_write(pr->c, (char *)reply, 8 + msgsize); |
32874aea |
472 | sshfwd_close(pr->c); |
473 | x11_close(s); |
b3ebaa28 |
474 | sfree(reply); |
475 | sfree(message); |
5471d09a |
476 | return 0; |
32874aea |
477 | } |
478 | |
479 | /* |
480 | * Now we know we're going to accept the connection. Strip |
e0e7dff8 |
481 | * the fake auth data, and optionally put real auth data in |
482 | * instead. |
32874aea |
483 | */ |
e0e7dff8 |
484 | { |
485 | char realauthdata[64]; |
486 | int realauthlen = 0; |
487 | int authstrlen = strlen(x11_authnames[pr->auth->realproto]); |
0a4022a1 |
488 | int buflen; |
e0e7dff8 |
489 | static const char zeroes[4] = { 0,0,0,0 }; |
0a4022a1 |
490 | void *buf; |
e0e7dff8 |
491 | |
492 | if (pr->auth->realproto == X11_MIT) { |
493 | assert(pr->auth->reallen <= lenof(realauthdata)); |
494 | realauthlen = pr->auth->reallen; |
495 | memcpy(realauthdata, pr->auth->realdata, realauthlen); |
2f92b717 |
496 | } else if (pr->auth->realproto == X11_XDM && |
497 | pr->auth->reallen == 16 && |
0c5ca1f3 |
498 | ((buf = sk_getxdmdata(s, &buflen))!=0)) { |
2f92b717 |
499 | time_t t; |
0a4022a1 |
500 | realauthlen = (buflen+12+7) & ~7; |
501 | assert(realauthlen <= lenof(realauthdata)); |
502 | memset(realauthdata, 0, realauthlen); |
2f92b717 |
503 | memcpy(realauthdata, pr->auth->realdata, 8); |
0a4022a1 |
504 | memcpy(realauthdata+8, buf, buflen); |
2f92b717 |
505 | t = time(NULL); |
0a4022a1 |
506 | PUT_32BIT_MSB_FIRST(realauthdata+8+buflen, t); |
6e7f5aee |
507 | des_encrypt_xdmauth(pr->auth->realdata+9, |
0a4022a1 |
508 | (unsigned char *)realauthdata, |
509 | realauthlen); |
510 | sfree(buf); |
2f92b717 |
511 | } |
e0e7dff8 |
512 | /* implement other auth methods here if required */ |
513 | |
514 | PUT_16BIT(pr->firstpkt[0], pr->firstpkt + 6, authstrlen); |
515 | PUT_16BIT(pr->firstpkt[0], pr->firstpkt + 8, realauthlen); |
516 | |
517 | sk_write(s, (char *)pr->firstpkt, 12); |
518 | |
519 | if (authstrlen) { |
520 | sk_write(s, x11_authnames[pr->auth->realproto], authstrlen); |
521 | sk_write(s, zeroes, 3 & (-authstrlen)); |
522 | } |
523 | if (realauthlen) { |
524 | sk_write(s, realauthdata, realauthlen); |
525 | sk_write(s, zeroes, 3 & (-realauthlen)); |
526 | } |
527 | } |
32874aea |
528 | pr->verified = 1; |
9c964e85 |
529 | } |
530 | |
531 | /* |
532 | * After initialisation, just copy data simply. |
533 | */ |
534 | |
5471d09a |
535 | return sk_write(s, data, len); |
9c964e85 |
536 | } |