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a09e091a JB |
1 | /* |
2 | ||
3 | Copyright 1988, 1998 The Open Group | |
4 | ||
5 | Permission to use, copy, modify, distribute, and sell this software and its | |
6 | documentation for any purpose is hereby granted without fee, provided that | |
7 | the above copyright notice appear in all copies and that both that | |
8 | copyright notice and this permission notice appear in supporting | |
9 | documentation. | |
10 | ||
11 | The above copyright notice and this permission notice shall be included | |
12 | in all copies or substantial portions of the Software. | |
13 | ||
14 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
15 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
16 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
17 | IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | OTHER DEALINGS IN THE SOFTWARE. | |
21 | ||
22 | Except as contained in this notice, the name of The Open Group shall | |
23 | not be used in advertising or otherwise to promote the sale, use or | |
24 | other dealings in this Software without prior written authorization | |
25 | from The Open Group. | |
26 | ||
27 | */ | |
28 | ||
29 | /* | |
30 | * XDM-AUTHENTICATION-1 (XDMCP authentication) and | |
31 | * XDM-AUTHORIZATION-1 (client authorization) protocols | |
32 | * | |
33 | * Author: Keith Packard, MIT X Consortium | |
34 | */ | |
35 | ||
36 | #ifdef HAVE_DIX_CONFIG_H | |
37 | #include <dix-config.h> | |
38 | #endif | |
39 | ||
40 | #include <stdio.h> | |
41 | #include <X11/X.h> | |
42 | #define XSERV_t | |
43 | #define TRANS_SERVER | |
44 | #define TRANS_REOPEN | |
45 | #include <X11/Xtrans/Xtrans.h> | |
46 | #include "os.h" | |
47 | #include "osdep.h" | |
48 | #include "dixstruct.h" | |
49 | ||
50 | #ifdef HASXDMAUTH | |
51 | ||
52 | static Bool authFromXDMCP; | |
53 | ||
54 | #ifdef XDMCP | |
55 | #include <X11/Xmd.h> | |
56 | #undef REQUEST | |
57 | #include <X11/Xdmcp.h> | |
58 | ||
59 | /* XDM-AUTHENTICATION-1 */ | |
60 | ||
61 | static XdmAuthKeyRec privateKey; | |
62 | static char XdmAuthenticationName[] = "XDM-AUTHENTICATION-1"; | |
63 | ||
64 | #define XdmAuthenticationNameLen (sizeof XdmAuthenticationName - 1) | |
65 | static XdmAuthKeyRec rho; | |
66 | ||
67 | static Bool | |
68 | XdmAuthenticationValidator(ARRAY8Ptr privateData, ARRAY8Ptr incomingData, | |
69 | xdmOpCode packet_type) | |
70 | { | |
71 | XdmAuthKeyPtr incoming; | |
72 | ||
73 | XdmcpUnwrap(incomingData->data, (unsigned char *) &privateKey, | |
74 | incomingData->data, incomingData->length); | |
75 | if (packet_type == ACCEPT) { | |
76 | if (incomingData->length != 8) | |
77 | return FALSE; | |
78 | incoming = (XdmAuthKeyPtr) incomingData->data; | |
79 | XdmcpDecrementKey(incoming); | |
80 | return XdmcpCompareKeys(incoming, &rho); | |
81 | } | |
82 | return FALSE; | |
83 | } | |
84 | ||
85 | static Bool | |
86 | XdmAuthenticationGenerator(ARRAY8Ptr privateData, ARRAY8Ptr outgoingData, | |
87 | xdmOpCode packet_type) | |
88 | { | |
89 | outgoingData->length = 0; | |
90 | outgoingData->data = 0; | |
91 | if (packet_type == REQUEST) { | |
92 | if (XdmcpAllocARRAY8(outgoingData, 8)) | |
93 | XdmcpWrap((unsigned char *) &rho, (unsigned char *) &privateKey, | |
94 | outgoingData->data, 8); | |
95 | } | |
96 | return TRUE; | |
97 | } | |
98 | ||
99 | static Bool | |
100 | XdmAuthenticationAddAuth(int name_len, const char *name, | |
101 | int data_len, char *data) | |
102 | { | |
103 | Bool ret; | |
104 | ||
105 | XdmcpUnwrap((unsigned char *) data, (unsigned char *) &privateKey, | |
106 | (unsigned char *) data, data_len); | |
107 | authFromXDMCP = TRUE; | |
108 | ret = AddAuthorization(name_len, name, data_len, data); | |
109 | authFromXDMCP = FALSE; | |
110 | return ret; | |
111 | } | |
112 | ||
113 | #define atox(c) ('0' <= c && c <= '9' ? c - '0' : \ | |
114 | 'a' <= c && c <= 'f' ? c - 'a' + 10 : \ | |
115 | 'A' <= c && c <= 'F' ? c - 'A' + 10 : -1) | |
116 | ||
117 | static int | |
118 | HexToBinary(const char *in, char *out, int len) | |
119 | { | |
120 | int top, bottom; | |
121 | ||
122 | while (len > 0) { | |
123 | top = atox(in[0]); | |
124 | if (top == -1) | |
125 | return 0; | |
126 | bottom = atox(in[1]); | |
127 | if (bottom == -1) | |
128 | return 0; | |
129 | *out++ = (top << 4) | bottom; | |
130 | in += 2; | |
131 | len -= 2; | |
132 | } | |
133 | if (len) | |
134 | return 0; | |
135 | *out++ = '\0'; | |
136 | return 1; | |
137 | } | |
138 | ||
139 | void | |
140 | XdmAuthenticationInit(const char *cookie, int cookie_len) | |
141 | { | |
142 | memset(privateKey.data, 0, 8); | |
143 | if (!strncmp(cookie, "0x", 2) || !strncmp(cookie, "0X", 2)) { | |
144 | if (cookie_len > 2 + 2 * 8) | |
145 | cookie_len = 2 + 2 * 8; | |
146 | HexToBinary(cookie + 2, (char *) privateKey.data, cookie_len - 2); | |
147 | } | |
148 | else { | |
149 | if (cookie_len > 7) | |
150 | cookie_len = 7; | |
151 | memmove(privateKey.data + 1, cookie, cookie_len); | |
152 | } | |
153 | XdmcpGenerateKey(&rho); | |
154 | XdmcpRegisterAuthentication(XdmAuthenticationName, XdmAuthenticationNameLen, | |
155 | (char *) &rho, | |
156 | sizeof(rho), | |
157 | (ValidatorFunc) XdmAuthenticationValidator, | |
158 | (GeneratorFunc) XdmAuthenticationGenerator, | |
159 | (AddAuthorFunc) XdmAuthenticationAddAuth); | |
160 | } | |
161 | ||
162 | #endif /* XDMCP */ | |
163 | ||
164 | /* XDM-AUTHORIZATION-1 */ | |
165 | typedef struct _XdmAuthorization { | |
166 | struct _XdmAuthorization *next; | |
167 | XdmAuthKeyRec rho; | |
168 | XdmAuthKeyRec key; | |
169 | XID id; | |
170 | } XdmAuthorizationRec, *XdmAuthorizationPtr; | |
171 | ||
172 | static XdmAuthorizationPtr xdmAuth; | |
173 | ||
174 | typedef struct _XdmClientAuth { | |
175 | struct _XdmClientAuth *next; | |
176 | XdmAuthKeyRec rho; | |
177 | char client[6]; | |
178 | long time; | |
179 | } XdmClientAuthRec, *XdmClientAuthPtr; | |
180 | ||
181 | static XdmClientAuthPtr xdmClients; | |
182 | static long clockOffset; | |
183 | static Bool gotClock; | |
184 | ||
185 | #define TwentyMinutes (20 * 60) | |
186 | #define TwentyFiveMinutes (25 * 60) | |
187 | ||
188 | static Bool | |
189 | XdmClientAuthCompare(const XdmClientAuthPtr a, const XdmClientAuthPtr b) | |
190 | { | |
191 | int i; | |
192 | ||
193 | if (!XdmcpCompareKeys(&a->rho, &b->rho)) | |
194 | return FALSE; | |
195 | for (i = 0; i < 6; i++) | |
196 | if (a->client[i] != b->client[i]) | |
197 | return FALSE; | |
198 | return a->time == b->time; | |
199 | } | |
200 | ||
201 | static void | |
202 | XdmClientAuthDecode(const unsigned char *plain, XdmClientAuthPtr auth) | |
203 | { | |
204 | int i, j; | |
205 | ||
206 | j = 0; | |
207 | for (i = 0; i < 8; i++) { | |
208 | auth->rho.data[i] = plain[j]; | |
209 | ++j; | |
210 | } | |
211 | for (i = 0; i < 6; i++) { | |
212 | auth->client[i] = plain[j]; | |
213 | ++j; | |
214 | } | |
215 | auth->time = 0; | |
216 | for (i = 0; i < 4; i++) { | |
217 | auth->time |= plain[j] << ((3 - i) << 3); | |
218 | j++; | |
219 | } | |
220 | } | |
221 | ||
222 | static void | |
223 | XdmClientAuthTimeout(long now) | |
224 | { | |
225 | XdmClientAuthPtr client, next, prev; | |
226 | ||
227 | prev = 0; | |
228 | for (client = xdmClients; client; client = next) { | |
229 | next = client->next; | |
230 | if (abs(now - client->time) > TwentyFiveMinutes) { | |
231 | if (prev) | |
232 | prev->next = next; | |
233 | else | |
234 | xdmClients = next; | |
235 | free(client); | |
236 | } | |
237 | else | |
238 | prev = client; | |
239 | } | |
240 | } | |
241 | ||
242 | static XdmClientAuthPtr | |
243 | XdmAuthorizationValidate(unsigned char *plain, int length, | |
244 | XdmAuthKeyPtr rho, ClientPtr xclient, | |
245 | const char **reason) | |
246 | { | |
247 | XdmClientAuthPtr client, existing; | |
248 | long now; | |
249 | int i; | |
250 | ||
251 | if (length != (192 / 8)) { | |
252 | if (reason) | |
253 | *reason = "Bad XDM authorization key length"; | |
254 | return NULL; | |
255 | } | |
256 | client = malloc(sizeof(XdmClientAuthRec)); | |
257 | if (!client) | |
258 | return NULL; | |
259 | XdmClientAuthDecode(plain, client); | |
260 | if (!XdmcpCompareKeys(&client->rho, rho)) { | |
261 | free(client); | |
262 | if (reason) | |
263 | *reason = "Invalid XDM-AUTHORIZATION-1 key (failed key comparison)"; | |
264 | return NULL; | |
265 | } | |
266 | for (i = 18; i < 24; i++) | |
267 | if (plain[i] != 0) { | |
268 | free(client); | |
269 | if (reason) | |
270 | *reason = "Invalid XDM-AUTHORIZATION-1 key (failed NULL check)"; | |
271 | return NULL; | |
272 | } | |
273 | if (xclient) { | |
274 | int family, addr_len; | |
275 | Xtransaddr *addr; | |
276 | ||
277 | if (_XSERVTransGetPeerAddr(((OsCommPtr) xclient->osPrivate)->trans_conn, | |
278 | &family, &addr_len, &addr) == 0 | |
279 | && _XSERVTransConvertAddress(&family, &addr_len, &addr) == 0) { | |
280 | #if defined(TCPCONN) || defined(STREAMSCONN) | |
281 | if (family == FamilyInternet && | |
282 | memcmp((char *) addr, client->client, 4) != 0) { | |
283 | free(client); | |
284 | free(addr); | |
285 | if (reason) | |
286 | *reason = | |
287 | "Invalid XDM-AUTHORIZATION-1 key (failed address comparison)"; | |
288 | return NULL; | |
289 | ||
290 | } | |
291 | #endif | |
292 | free(addr); | |
293 | } | |
294 | } | |
295 | now = time(0); | |
296 | if (!gotClock) { | |
297 | clockOffset = client->time - now; | |
298 | gotClock = TRUE; | |
299 | } | |
300 | now += clockOffset; | |
301 | XdmClientAuthTimeout(now); | |
302 | if (abs(client->time - now) > TwentyMinutes) { | |
303 | free(client); | |
304 | if (reason) | |
305 | *reason = "Excessive XDM-AUTHORIZATION-1 time offset"; | |
306 | return NULL; | |
307 | } | |
308 | for (existing = xdmClients; existing; existing = existing->next) { | |
309 | if (XdmClientAuthCompare(existing, client)) { | |
310 | free(client); | |
311 | if (reason) | |
312 | *reason = "XDM authorization key matches an existing client!"; | |
313 | return NULL; | |
314 | } | |
315 | } | |
316 | return client; | |
317 | } | |
318 | ||
319 | int | |
320 | XdmAddCookie(unsigned short data_length, const char *data, XID id) | |
321 | { | |
322 | XdmAuthorizationPtr new; | |
323 | unsigned char *rho_bits, *key_bits; | |
324 | ||
325 | switch (data_length) { | |
326 | case 16: /* auth from files is 16 bytes long */ | |
327 | #ifdef XDMCP | |
328 | if (authFromXDMCP) { | |
329 | /* R5 xdm sent bogus authorization data in the accept packet, | |
330 | * but we can recover */ | |
331 | rho_bits = rho.data; | |
332 | key_bits = (unsigned char *) data; | |
333 | key_bits[0] = '\0'; | |
334 | } | |
335 | else | |
336 | #endif | |
337 | { | |
338 | rho_bits = (unsigned char *) data; | |
339 | key_bits = (unsigned char *) (data + 8); | |
340 | } | |
341 | break; | |
342 | #ifdef XDMCP | |
343 | case 8: /* auth from XDMCP is 8 bytes long */ | |
344 | rho_bits = rho.data; | |
345 | key_bits = (unsigned char *) data; | |
346 | break; | |
347 | #endif | |
348 | default: | |
349 | return 0; | |
350 | } | |
351 | /* the first octet of the key must be zero */ | |
352 | if (key_bits[0] != '\0') | |
353 | return 0; | |
354 | new = malloc(sizeof(XdmAuthorizationRec)); | |
355 | if (!new) | |
356 | return 0; | |
357 | new->next = xdmAuth; | |
358 | xdmAuth = new; | |
359 | memmove(new->key.data, key_bits, (int) 8); | |
360 | memmove(new->rho.data, rho_bits, (int) 8); | |
361 | new->id = id; | |
362 | return 1; | |
363 | } | |
364 | ||
365 | XID | |
366 | XdmCheckCookie(unsigned short cookie_length, const char *cookie, | |
367 | ClientPtr xclient, const char **reason) | |
368 | { | |
369 | XdmAuthorizationPtr auth; | |
370 | XdmClientAuthPtr client; | |
371 | unsigned char *plain; | |
372 | ||
373 | /* Auth packets must be a multiple of 8 bytes long */ | |
374 | if (cookie_length & 7) | |
375 | return (XID) -1; | |
376 | plain = malloc(cookie_length); | |
377 | if (!plain) | |
378 | return (XID) -1; | |
379 | for (auth = xdmAuth; auth; auth = auth->next) { | |
380 | XdmcpUnwrap((unsigned char *) cookie, (unsigned char *) &auth->key, | |
381 | plain, cookie_length); | |
382 | if ((client = | |
383 | XdmAuthorizationValidate(plain, cookie_length, &auth->rho, xclient, | |
384 | reason)) != NULL) { | |
385 | client->next = xdmClients; | |
386 | xdmClients = client; | |
387 | free(plain); | |
388 | return auth->id; | |
389 | } | |
390 | } | |
391 | free(plain); | |
392 | return (XID) -1; | |
393 | } | |
394 | ||
395 | int | |
396 | XdmResetCookie(void) | |
397 | { | |
398 | XdmAuthorizationPtr auth, next_auth; | |
399 | XdmClientAuthPtr client, next_client; | |
400 | ||
401 | for (auth = xdmAuth; auth; auth = next_auth) { | |
402 | next_auth = auth->next; | |
403 | free(auth); | |
404 | } | |
405 | xdmAuth = 0; | |
406 | for (client = xdmClients; client; client = next_client) { | |
407 | next_client = client->next; | |
408 | free(client); | |
409 | } | |
410 | xdmClients = (XdmClientAuthPtr) 0; | |
411 | return 1; | |
412 | } | |
413 | ||
414 | XID | |
415 | XdmToID(unsigned short cookie_length, char *cookie) | |
416 | { | |
417 | XdmAuthorizationPtr auth; | |
418 | XdmClientAuthPtr client; | |
419 | unsigned char *plain; | |
420 | ||
421 | plain = malloc(cookie_length); | |
422 | if (!plain) | |
423 | return (XID) -1; | |
424 | for (auth = xdmAuth; auth; auth = auth->next) { | |
425 | XdmcpUnwrap((unsigned char *) cookie, (unsigned char *) &auth->key, | |
426 | plain, cookie_length); | |
427 | if ((client = | |
428 | XdmAuthorizationValidate(plain, cookie_length, &auth->rho, NULL, | |
429 | NULL)) != NULL) { | |
430 | free(client); | |
431 | free(cookie); | |
432 | free(plain); | |
433 | return auth->id; | |
434 | } | |
435 | } | |
436 | free(cookie); | |
437 | free(plain); | |
438 | return (XID) -1; | |
439 | } | |
440 | ||
441 | int | |
442 | XdmFromID(XID id, unsigned short *data_lenp, char **datap) | |
443 | { | |
444 | XdmAuthorizationPtr auth; | |
445 | ||
446 | for (auth = xdmAuth; auth; auth = auth->next) { | |
447 | if (id == auth->id) { | |
448 | *data_lenp = 16; | |
449 | *datap = (char *) &auth->rho; | |
450 | return 1; | |
451 | } | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
456 | int | |
457 | XdmRemoveCookie(unsigned short data_length, const char *data) | |
458 | { | |
459 | XdmAuthorizationPtr auth; | |
460 | XdmAuthKeyPtr key_bits, rho_bits; | |
461 | ||
462 | switch (data_length) { | |
463 | case 16: | |
464 | rho_bits = (XdmAuthKeyPtr) data; | |
465 | key_bits = (XdmAuthKeyPtr) (data + 8); | |
466 | break; | |
467 | #ifdef XDMCP | |
468 | case 8: | |
469 | rho_bits = ρ | |
470 | key_bits = (XdmAuthKeyPtr) data; | |
471 | break; | |
472 | #endif | |
473 | default: | |
474 | return 0; | |
475 | } | |
476 | for (auth = xdmAuth; auth; auth = auth->next) { | |
477 | if (XdmcpCompareKeys(rho_bits, &auth->rho) && | |
478 | XdmcpCompareKeys(key_bits, &auth->key)) { | |
479 | xdmAuth = auth->next; | |
480 | free(auth); | |
481 | return 1; | |
482 | } | |
483 | } | |
484 | return 0; | |
485 | } | |
486 | ||
487 | #endif |