255 lines
7.4 KiB
C
255 lines
7.4 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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#include <assert.h>
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#include <X11/Xauth.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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#include <sys/param.h>
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#include <unistd.h>
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#include <stdlib.h>
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/* FIXME: for the moment Xdmcp.h must be included before xcb.h because
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* it includes Xmd.h, but config.h (normally included from xcbint.h
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* which must be included after xcb.h) must be included before Xdmcp.h.
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* Ow. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HASXDMAUTH
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#include <X11/Xdmcp.h>
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#endif
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#include "xcb.h"
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#include "xcbint.h"
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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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static char *authnames[N_AUTH_PROTOS] = {
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#ifdef HASXDMAUTH
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"XDM-AUTHORIZATION-1",
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#endif
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"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, int namelen)
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{
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if(strlen(authnames[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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static Xauth *get_authptr(struct sockaddr *sockname, unsigned int socknamelen)
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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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char *display;
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int authnamelens[N_AUTH_PROTOS];
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int i;
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family = FamilyLocal; /* 256 */
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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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assert(sizeof(*si) == socknamelen);
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addr = (char *) &si->sin_addr;
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addrlen = 4;
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if (ntohl(si->sin_addr.s_addr) != 0x7f000001)
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family = XCB_FAMILY_INTERNET;
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snprintf(dispbuf, sizeof(dispbuf), "%d", ntohs(si->sin_port) - X_TCP_PORT);
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display = dispbuf;
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}
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break;
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case AF_UNIX:
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/*block*/ {
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struct sockaddr_un *su = (struct sockaddr_un *) sockname;
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char *sockbuf = (char *) sockname;
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assert(sizeof(*su) >= socknamelen);
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sockbuf[socknamelen] = 0; /* null-terminate path */
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display = strrchr(su->sun_path, 'X');
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if (display == 0)
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return 0; /* sockname is mangled somehow */
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display++;
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}
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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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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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for (i = 0; i < N_AUTH_PROTOS; i++)
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authnamelens[i] = strlen(authnames[i]);
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return XauGetBestAuthByAddr (family,
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(unsigned short) addrlen, addr,
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(unsigned short) strlen(display), display,
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N_AUTH_PROTOS, authnames, authnamelens);
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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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case AF_UNIX:
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/*block*/ {
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long fakeaddr = htonl(0xffffffff - next_nonce());
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short 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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long now;
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time(&now);
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now = htonl(now);
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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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int _xcb_get_auth_info(int fd, xcb_auth_info_t *info)
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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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char sockbuf[sizeof(struct sockaddr) + MAXPATHLEN];
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unsigned int socknamelen = sizeof(sockbuf); /* need extra space */
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struct sockaddr *sockname = (struct sockaddr *) &sockbuf;
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Xauth *authptr = 0;
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int ret = 1;
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/* ensure info has reasonable contents */
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/* XXX This should be removed, but Jamey depends on it
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somehow but can't remember how. Principle: don't touch
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someone else's data if you're borken. */
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info->namelen = info->datalen = 0;
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info->name = info->data = 0;
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if (getpeername(fd, sockname, &socknamelen) == -1)
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return 0; /* can only authenticate sockets */
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authptr = get_authptr(sockname, socknamelen);
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if (authptr == 0)
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return 0; /* cannot find good auth data */
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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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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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info->name = 0;
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info->namelen = 0;
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}
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XauDisposeAuth(authptr);
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return ret;
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}
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