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-rw-r--r--libxcb/src/xcb_auth.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/libxcb/src/xcb_auth.c b/libxcb/src/xcb_auth.c
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+++ b/libxcb/src/xcb_auth.c
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+/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the names of the authors or their
+ * institutions shall not be used in advertising or otherwise to promote the
+ * sale, use or other dealings in this Software without prior written
+ * authorization from the authors.
+ */
+
+/* Authorization systems for the X protocol. */
+
+#include <assert.h>
+#include <X11/Xauth.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/un.h>
+#include <sys/param.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "xcb.h"
+#include "xcbint.h"
+
+#ifdef HASXDMAUTH
+#include <X11/Xdmcp.h>
+#endif
+
+enum auth_protos {
+#ifdef HASXDMAUTH
+ AUTH_XA1,
+#endif
+ AUTH_MC1,
+ N_AUTH_PROTOS
+};
+
+static char *authnames[N_AUTH_PROTOS] = {
+#ifdef HASXDMAUTH
+ "XDM-AUTHORIZATION-1",
+#endif
+ "MIT-MAGIC-COOKIE-1",
+};
+
+static size_t memdup(char **dst, void *src, size_t len)
+{
+ if(len)
+ *dst = malloc(len);
+ else
+ *dst = 0;
+ if(!*dst)
+ return 0;
+ memcpy(*dst, src, len);
+ return len;
+}
+
+static int authname_match(enum auth_protos kind, char *name, int namelen)
+{
+ if(strlen(authnames[kind]) != namelen)
+ return 0;
+ if(memcmp(authnames[kind], name, namelen))
+ return 0;
+ return 1;
+}
+
+#define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr)
+
+static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen,
+ int display)
+{
+ char *addr = 0;
+ int addrlen = 0;
+ unsigned short family;
+ char hostnamebuf[256]; /* big enough for max hostname */
+ char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */
+ int authnamelens[N_AUTH_PROTOS];
+ int i;
+
+ family = FamilyLocal; /* 256 */
+ switch(sockname->sa_family)
+ {
+ case AF_INET6:
+ addr = (char *) SIN6_ADDR(sockname);
+ addrlen = sizeof(*SIN6_ADDR(sockname));
+ if(!IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
+ {
+ if(!IN6_IS_ADDR_LOOPBACK(SIN6_ADDR(sockname)))
+ family = XCB_FAMILY_INTERNET_6;
+ break;
+ }
+ addr += 12;
+ /* if v4-mapped, fall through. */
+ case AF_INET:
+ if(!addr)
+ addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr;
+ addrlen = sizeof(((struct sockaddr_in *)sockname)->sin_addr);
+ if(*(in_addr_t *) addr != htonl(INADDR_LOOPBACK))
+ family = XCB_FAMILY_INTERNET;
+ break;
+ case AF_UNIX:
+ break;
+ default:
+ return 0; /* cannot authenticate this family */
+ }
+
+ snprintf(dispbuf, sizeof(dispbuf), "%d", display);
+
+ if (family == FamilyLocal) {
+ if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
+ return 0; /* do not know own hostname */
+ addr = hostnamebuf;
+ addrlen = strlen(addr);
+ }
+
+ for (i = 0; i < N_AUTH_PROTOS; i++)
+ authnamelens[i] = strlen(authnames[i]);
+ return XauGetBestAuthByAddr (family,
+ (unsigned short) addrlen, addr,
+ (unsigned short) strlen(dispbuf), dispbuf,
+ N_AUTH_PROTOS, authnames, authnamelens);
+}
+
+#ifdef HASXDMAUTH
+static int next_nonce(void)
+{
+ static int nonce = 0;
+ static pthread_mutex_t nonce_mutex = PTHREAD_MUTEX_INITIALIZER;
+ int ret;
+ pthread_mutex_lock(&nonce_mutex);
+ ret = nonce++;
+ pthread_mutex_unlock(&nonce_mutex);
+ return ret;
+}
+
+static void do_append(char *buf, int *idxp, void *val, size_t valsize) {
+ memcpy(buf + *idxp, val, valsize);
+ *idxp += valsize;
+}
+#endif
+
+static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *sockname)
+{
+ if (authname_match(AUTH_MC1, authptr->name, authptr->name_length)) {
+ info->datalen = memdup(&info->data, authptr->data, authptr->data_length);
+ if(!info->datalen)
+ return 0;
+ return 1;
+ }
+#ifdef HASXDMAUTH
+#define APPEND(buf,idx,val) do_append((buf),&(idx),&(val),sizeof(val))
+ if (authname_match(AUTH_XA1, authptr->name, authptr->name_length)) {
+ int j;
+
+ info->data = malloc(192 / 8);
+ if(!info->data)
+ return 0;
+
+ for (j = 0; j < 8; j++)
+ info->data[j] = authptr->data[j];
+ switch(sockname->sa_family) {
+ case AF_INET:
+ /*block*/ {
+ struct sockaddr_in *si = (struct sockaddr_in *) sockname;
+ APPEND(info->data, j, si->sin_addr.s_addr);
+ APPEND(info->data, j, si->sin_port);
+ }
+ break;
+ case AF_INET6:
+ /*block*/ {
+ struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname;
+ if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
+ {
+ APPEND(info->data, j, si6->sin6_addr.s6_addr[12]);
+ APPEND(info->data, j, si6->sin6_port);
+ }
+ else
+ {
+ /* XDM-AUTHORIZATION-1 does not handle IPv6 correctly. Do the
+ same thing Xlib does: use all zeroes for the 4-byte address
+ and 2-byte port number. */
+ uint32_t fakeaddr = 0;
+ uint16_t fakeport = 0;
+ APPEND(info->data, j, fakeaddr);
+ APPEND(info->data, j, fakeport);
+ }
+ }
+ break;
+ case AF_UNIX:
+ /*block*/ {
+ uint32_t fakeaddr = htonl(0xffffffff - next_nonce());
+ uint16_t fakeport = htons(getpid());
+ APPEND(info->data, j, fakeaddr);
+ APPEND(info->data, j, fakeport);
+ }
+ break;
+ default:
+ free(info->data);
+ return 0; /* do not know how to build this */
+ }
+ {
+ uint32_t now = htonl(time(0));
+ APPEND(info->data, j, now);
+ }
+ assert(j <= 192 / 8);
+ while (j < 192 / 8)
+ info->data[j++] = 0;
+ info->datalen = j;
+ XdmcpWrap ((unsigned char *) info->data, (unsigned char *) authptr->data + 8, (unsigned char *) info->data, info->datalen);
+ return 1;
+ }
+#undef APPEND
+#endif
+
+ return 0; /* Unknown authorization type */
+}
+
+int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
+{
+ /* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c,
+ xtrans/Xtransutils.c */
+ char sockbuf[sizeof(struct sockaddr) + MAXPATHLEN];
+ unsigned int socknamelen = sizeof(sockbuf); /* need extra space */
+ struct sockaddr *sockname = (struct sockaddr *) &sockbuf;
+ Xauth *authptr = 0;
+ int ret = 1;
+
+ if (getpeername(fd, sockname, &socknamelen) == -1)
+ return 0; /* can only authenticate sockets */
+
+ authptr = get_authptr(sockname, socknamelen, display);
+ if (authptr == 0)
+ return 0; /* cannot find good auth data */
+
+ info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
+ if(info->namelen)
+ ret = compute_auth(info, authptr, sockname);
+ if(!ret)
+ {
+ free(info->name);
+ info->name = 0;
+ info->namelen = 0;
+ }
+ XauDisposeAuth(authptr);
+ return ret;
+}