380 lines
11 KiB
C
380 lines
11 KiB
C
/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the names of the authors or their
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* institutions shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization from the authors.
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*/
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/* Authorization systems for the X protocol. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <assert.h>
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#include <X11/Xauth.h>
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#include <sys/param.h>
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#include <unistd.h>
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#include <stdlib.h>
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#ifdef __INTERIX
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/* _don't_ ask. interix has INADDR_LOOPBACK in here. */
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#include <rpc/types.h>
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#endif
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#ifdef _WIN32
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#ifdef HASXDMAUTH
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/* We must include the wrapped windows.h before any system header which includes
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it unwrapped, to avoid conflicts with types defined in X headers */
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#include <X11/Xwindows.h>
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#endif
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#include "xcb_windefs.h"
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#else
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/un.h>
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#endif /* _WIN32 */
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#include "xcb.h"
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#include "xcbint.h"
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#ifdef HASXDMAUTH
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#include <X11/Xdmcp.h>
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#endif
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enum auth_protos {
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#ifdef HASXDMAUTH
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AUTH_XA1,
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#endif
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AUTH_MC1,
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N_AUTH_PROTOS
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};
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#define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1"
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#define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1"
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static char *authnames[N_AUTH_PROTOS] = {
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#ifdef HASXDMAUTH
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AUTH_PROTO_XDM_AUTHORIZATION,
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#endif
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AUTH_PROTO_MIT_MAGIC_COOKIE,
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};
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static int authnameslen[N_AUTH_PROTOS] = {
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#ifdef HASXDMAUTH
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sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1,
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#endif
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sizeof(AUTH_PROTO_MIT_MAGIC_COOKIE) - 1,
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};
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static size_t memdup(char **dst, void *src, size_t len)
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{
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if(len)
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*dst = malloc(len);
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else
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*dst = 0;
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if(!*dst)
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return 0;
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memcpy(*dst, src, len);
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return len;
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}
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static int authname_match(enum auth_protos kind, char *name, size_t namelen)
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{
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if(authnameslen[kind] != namelen)
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return 0;
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if(memcmp(authnames[kind], name, namelen))
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return 0;
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return 1;
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}
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#define SIN6_ADDR(s) (&((struct sockaddr_in6 *)s)->sin6_addr)
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static Xauth *get_authptr(struct sockaddr *sockname, int display)
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{
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char *addr = 0;
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int addrlen = 0;
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unsigned short family;
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char hostnamebuf[256]; /* big enough for max hostname */
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char dispbuf[40]; /* big enough to hold more than 2^64 base 10 */
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int dispbuflen;
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family = FamilyLocal; /* 256 */
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switch(sockname->sa_family)
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{
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#ifdef AF_INET6
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case AF_INET6:
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addr = (char *) SIN6_ADDR(sockname);
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addrlen = sizeof(*SIN6_ADDR(sockname));
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if(!IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
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{
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if(!IN6_IS_ADDR_LOOPBACK(SIN6_ADDR(sockname)))
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family = XCB_FAMILY_INTERNET_6;
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break;
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}
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addr += 12;
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/* if v4-mapped, fall through. */
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#endif
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case AF_INET:
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if(!addr)
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addr = (char *) &((struct sockaddr_in *)sockname)->sin_addr;
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addrlen = sizeof(((struct sockaddr_in *)sockname)->sin_addr);
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if(*(in_addr_t *) addr != htonl(INADDR_LOOPBACK))
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family = XCB_FAMILY_INTERNET;
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break;
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case AF_UNIX:
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break;
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default:
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return 0; /* cannot authenticate this family */
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}
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dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display);
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if(dispbuflen < 0)
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return 0;
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/* snprintf may have truncate our text */
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dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1);
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if (family == FamilyLocal) {
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if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
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return 0; /* do not know own hostname */
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addr = hostnamebuf;
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addrlen = strlen(addr);
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}
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return XauGetBestAuthByAddr (family,
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(unsigned short) addrlen, addr,
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(unsigned short) dispbuflen, dispbuf,
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N_AUTH_PROTOS, authnames, authnameslen);
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}
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#ifdef HASXDMAUTH
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static int next_nonce(void)
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{
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static int nonce = 0;
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static pthread_mutex_t nonce_mutex = PTHREAD_MUTEX_INITIALIZER;
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int ret;
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pthread_mutex_lock(&nonce_mutex);
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ret = nonce++;
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pthread_mutex_unlock(&nonce_mutex);
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return ret;
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}
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static void do_append(char *buf, int *idxp, void *val, size_t valsize) {
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memcpy(buf + *idxp, val, valsize);
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*idxp += valsize;
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}
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#endif
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static int compute_auth(xcb_auth_info_t *info, Xauth *authptr, struct sockaddr *sockname)
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{
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if (authname_match(AUTH_MC1, authptr->name, authptr->name_length)) {
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info->datalen = memdup(&info->data, authptr->data, authptr->data_length);
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if(!info->datalen)
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return 0;
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return 1;
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}
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#ifdef HASXDMAUTH
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#define APPEND(buf,idx,val) do_append((buf),&(idx),&(val),sizeof(val))
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if (authname_match(AUTH_XA1, authptr->name, authptr->name_length)) {
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int j;
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info->data = malloc(192 / 8);
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if(!info->data)
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return 0;
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for (j = 0; j < 8; j++)
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info->data[j] = authptr->data[j];
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switch(sockname->sa_family) {
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case AF_INET:
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/*block*/ {
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struct sockaddr_in *si = (struct sockaddr_in *) sockname;
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APPEND(info->data, j, si->sin_addr.s_addr);
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APPEND(info->data, j, si->sin_port);
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}
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break;
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#ifdef AF_INET6
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case AF_INET6:
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/*block*/ {
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struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname;
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if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
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{
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do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4);
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APPEND(info->data, j, si6->sin6_port);
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}
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else
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{
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/* XDM-AUTHORIZATION-1 does not handle IPv6 correctly. Do the
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same thing Xlib does: use all zeroes for the 4-byte address
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and 2-byte port number. */
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uint32_t fakeaddr = 0;
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uint16_t fakeport = 0;
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APPEND(info->data, j, fakeaddr);
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APPEND(info->data, j, fakeport);
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}
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}
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break;
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#endif
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case AF_UNIX:
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/*block*/ {
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uint32_t fakeaddr = htonl(0xffffffff - next_nonce());
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uint16_t fakeport = htons(getpid());
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APPEND(info->data, j, fakeaddr);
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APPEND(info->data, j, fakeport);
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}
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break;
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default:
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free(info->data);
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return 0; /* do not know how to build this */
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}
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{
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uint32_t now = htonl(time(0));
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APPEND(info->data, j, now);
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}
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assert(j <= 192 / 8);
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while (j < 192 / 8)
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info->data[j++] = 0;
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info->datalen = j;
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XdmcpWrap ((unsigned char *) info->data, (unsigned char *) authptr->data + 8, (unsigned char *) info->data, info->datalen);
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return 1;
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}
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#undef APPEND
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#endif
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return 0; /* Unknown authorization type */
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}
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/* `sockaddr_un.sun_path' typical size usually ranges between 92 and 108 */
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#define INITIAL_SOCKNAME_SLACK 108
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/* Return a dynamically allocated socket address structure according
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to the value returned by either getpeername() or getsockname()
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(according to POSIX, applications should not assume a particular
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length for `sockaddr_un.sun_path') */
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static struct sockaddr *get_peer_sock_name(int (*socket_func)(int,
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struct sockaddr *,
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socklen_t *),
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int fd)
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{
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socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK;
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socklen_t actual_socknamelen = socknamelen;
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struct sockaddr *sockname = malloc(socknamelen);
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if (sockname == NULL)
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return NULL;
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/* Both getpeername() and getsockname() truncates sockname if
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there is not enough space and set the required length in
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actual_socknamelen */
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if (socket_func(fd, sockname, &actual_socknamelen) == -1)
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goto sock_or_realloc_error;
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if (actual_socknamelen > socknamelen)
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{
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struct sockaddr *new_sockname = NULL;
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socknamelen = actual_socknamelen;
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if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL)
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goto sock_or_realloc_error;
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sockname = new_sockname;
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if (socket_func(fd, sockname, &actual_socknamelen) == -1 ||
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actual_socknamelen > socknamelen)
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goto sock_or_realloc_error;
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}
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return sockname;
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sock_or_realloc_error:
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free(sockname);
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return NULL;
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}
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int _xcb_get_auth_info(int fd, xcb_auth_info_t *info, int display)
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{
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/* code adapted from Xlib/ConnDis.c, xtrans/Xtranssocket.c,
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xtrans/Xtransutils.c */
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struct sockaddr *sockname = NULL;
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int gotsockname = 0;
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Xauth *authptr = 0;
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int ret = 1;
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/* Some systems like hpux or Hurd do not expose peer names
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* for UNIX Domain Sockets, but this is irrelevant,
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* since compute_auth() ignores the peer name in this
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* case anyway.*/
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if ((sockname = get_peer_sock_name(getpeername, fd)) == NULL)
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{
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if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
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return 0; /* can only authenticate sockets */
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if (sockname->sa_family != AF_UNIX)
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{
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free(sockname);
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return 0; /* except for AF_UNIX, sockets should have peernames */
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}
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gotsockname = 1;
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}
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authptr = get_authptr(sockname, display);
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if (authptr == 0)
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{
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free(sockname);
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return 0; /* cannot find good auth data */
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}
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info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
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if (!info->namelen)
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goto no_auth; /* out of memory */
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if (!gotsockname)
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{
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free(sockname);
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if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
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{
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free(info->name);
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goto no_auth; /* can only authenticate sockets */
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}
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}
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ret = compute_auth(info, authptr, sockname);
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if(!ret)
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{
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free(info->name);
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goto no_auth; /* cannot build auth record */
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}
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free(sockname);
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sockname = NULL;
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XauDisposeAuth(authptr);
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return ret;
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no_auth:
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free(sockname);
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info->name = 0;
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info->namelen = 0;
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XauDisposeAuth(authptr);
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return 0;
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}
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