1 /* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
3 * Permission is hereby granted, free of charge, to any person obtaining a
4 * copy of this software and associated documentation files (the "Software"),
5 * to deal in the Software without restriction, including without limitation
6 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
7 * and/or sell copies of the Software, and to permit persons to whom the
8 * Software is furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
17 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 * Except as contained in this notice, the names of the authors or their
21 * institutions shall not be used in advertising or otherwise to promote the
22 * sale, use or other dealings in this Software without prior written
23 * authorization from the authors.
26 /* Authorization systems for the X protocol. */
29 #include <X11/Xauth.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
33 #include <sys/param.h>
41 #include <X11/Xdmcp.h>
52 #define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1"
53 #define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1"
55 static char *authnames[N_AUTH_PROTOS] = {
57 AUTH_PROTO_XDM_AUTHORIZATION,
59 AUTH_PROTO_MIT_MAGIC_COOKIE,
62 static int authnameslen[N_AUTH_PROTOS] = {
64 sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1,
66 sizeof(AUTH_PROTO_MIT_MAGIC_COOKIE) - 1,
69 static size_t memdup(char **dst, void *src, size_t len)
77 memcpy(*dst, src, len);
81 static int authname_match(enum auth_protos kind, char *name, size_t namelen)
83 if(authnameslen[kind] != namelen)
85 if(memcmp(authnames[kind], name, namelen))
90 #define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr)
92 static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
97 unsigned short family;
98 char hostnamebuf[256]; /* big enough for max hostname */
99 char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */
102 family = FamilyLocal; /* 256 */
103 switch(sockname->sa_family)
107 addr = (char *) SIN6_ADDR(sockname);
108 addrlen = sizeof(*SIN6_ADDR(sockname));
109 if(!IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
111 if(!IN6_IS_ADDR_LOOPBACK(SIN6_ADDR(sockname)))
112 family = XCB_FAMILY_INTERNET_6;
116 /* if v4-mapped, fall through. */
120 addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr;
121 addrlen = sizeof(((struct sockaddr_in *)sockname)->sin_addr);
122 if(*(in_addr_t *) addr != htonl(INADDR_LOOPBACK))
123 family = XCB_FAMILY_INTERNET;
128 return 0; /* cannot authenticate this family */
131 dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display);
134 /* snprintf may have truncate our text */
135 dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1);
137 if (family == FamilyLocal) {
138 if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
139 return 0; /* do not know own hostname */
141 addrlen = strlen(addr);
144 return XauGetBestAuthByAddr (family,
145 (unsigned short) addrlen, addr,
146 (unsigned short) dispbuflen, dispbuf,
147 N_AUTH_PROTOS, authnames, authnameslen);
151 static int next_nonce(void)
153 static int nonce = 0;
154 static pthread_mutex_t nonce_mutex = PTHREAD_MUTEX_INITIALIZER;
156 pthread_mutex_lock(&nonce_mutex);
158 pthread_mutex_unlock(&nonce_mutex);
162 static void do_append(char *buf, int *idxp, void *val, size_t valsize) {
163 memcpy(buf + *idxp, val, valsize);
168 static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *sockname)
170 if (authname_match(AUTH_MC1, authptr->name, authptr->name_length)) {
171 info->datalen = memdup(&info->data, authptr->data, authptr->data_length);
177 #define APPEND(buf,idx,val) do_append((buf),&(idx),&(val),sizeof(val))
178 if (authname_match(AUTH_XA1, authptr->name, authptr->name_length)) {
181 info->data = malloc(192 / 8);
185 for (j = 0; j < 8; j++)
186 info->data[j] = authptr->data[j];
187 switch(sockname->sa_family) {
190 struct sockaddr_in *si = (struct sockaddr_in *) sockname;
191 APPEND(info->data, j, si->sin_addr.s_addr);
192 APPEND(info->data, j, si->sin_port);
198 struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname;
199 if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
201 do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4);
202 APPEND(info->data, j, si6->sin6_port);
206 /* XDM-AUTHORIZATION-1 does not handle IPv6 correctly. Do the
207 same thing Xlib does: use all zeroes for the 4-byte address
208 and 2-byte port number. */
209 uint32_t fakeaddr = 0;
210 uint16_t fakeport = 0;
211 APPEND(info->data, j, fakeaddr);
212 APPEND(info->data, j, fakeport);
219 uint32_t fakeaddr = htonl(0xffffffff - next_nonce());
220 uint16_t fakeport = htons(getpid());
221 APPEND(info->data, j, fakeaddr);
222 APPEND(info->data, j, fakeport);
227 return 0; /* do not know how to build this */
230 uint32_t now = htonl(time(0));
231 APPEND(info->data, j, now);
233 assert(j <= 192 / 8);
237 XdmcpWrap ((unsigned char *) info->data, (unsigned char *) authptr->data + 8, (unsigned char *) info->data, info->datalen);
243 return 0; /* Unknown authorization type */
246 int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
248 /* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c,
249 xtrans/Xtransutils.c */
250 char sockbuf[sizeof(struct sockaddr) + MAXPATHLEN];
251 unsigned int socknamelen = sizeof(sockbuf); /* need extra space */
252 struct sockaddr *sockname = (struct sockaddr *) &sockbuf;
257 /* Some systems like hpux or Hurd do not expose peer names
258 * for UNIX Domain Sockets, but this is irrelevant,
259 * since compute_auth() ignores the peer name in this
261 if (getpeername(fd, sockname, &socknamelen) == -1)
263 if (sockname->sa_family != AF_UNIX)
264 return 0; /* except for AF_UNIX, sockets should have peernames */
265 if (getsockname(fd, sockname, &socknamelen) == -1)
266 return 0; /* can only authenticate sockets */
270 authptr = get_authptr(sockname, socknamelen, display);
272 return 0; /* cannot find good auth data */
274 info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
276 goto no_auth; /* out of memory */
278 if (!gotsockname && getsockname(fd, sockname, &socknamelen) == -1)
281 goto no_auth; /* can only authenticate sockets */
284 ret = compute_auth(info, authptr, sockname);
288 goto no_auth; /* cannot build auth record */
291 XauDisposeAuth(authptr);
297 XauDisposeAuth(authptr);