380 lines
11 KiB
C
380 lines
11 KiB
C
|
/* 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. */
|
||
|
|
|
||
|
|
#ifdef HAVE_CONFIG_H
|
||
|
|
#include "config.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
#include <X11/Xauth.h>
|
||
|
|
#include <sys/param.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#ifdef __INTERIX
|
||
|
|
/* _don't_ ask. interix has INADDR_LOOPBACK in here. */
|
||
|
|
#include <rpc/types.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef _WIN32
|
||
|
|
#ifdef HASXDMAUTH
|
||
|
|
/* We must include the wrapped windows.h before any system header which includes
|
||
|
|
it unwrapped, to avoid conflicts with types defined in X headers */
|
||
|
|
#include <X11/Xwindows.h>
|
||
|
|
#endif
|
||
|
|
#include "xcb_windefs.h"
|
||
|
|
#else
|
||
|
|
#include <arpa/inet.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
#include <netinet/in.h>
|
||
|
|
#include <sys/un.h>
|
||
|
|
#endif /* _WIN32 */
|
||
|
|
|
||
|
|
#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
|
||
|
|
};
|
||
|
|
|
||
|
|
#define AUTH_PROTO_XDM_AUTHORIZATION "XDM-AUTHORIZATION-1"
|
||
|
|
#define AUTH_PROTO_MIT_MAGIC_COOKIE "MIT-MAGIC-COOKIE-1"
|
||
|
|
|
||
|
|
static char *authnames[N_AUTH_PROTOS] = {
|
||
|
|
#ifdef HASXDMAUTH
|
||
|
|
AUTH_PROTO_XDM_AUTHORIZATION,
|
||
|
|
#endif
|
||
|
|
AUTH_PROTO_MIT_MAGIC_COOKIE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int authnameslen[N_AUTH_PROTOS] = {
|
||
|
|
#ifdef HASXDMAUTH
|
||
|
|
sizeof(AUTH_PROTO_XDM_AUTHORIZATION) - 1,
|
||
|
|
#endif
|
||
|
|
sizeof(AUTH_PROTO_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, size_t namelen)
|
||
|
|
{
|
||
|
|
if(authnameslen[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, 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 dispbuflen;
|
||
|
|
|
||
|
|
family = FamilyLocal; /* 256 */
|
||
|
|
switch(sockname->sa_family)
|
||
|
|
{
|
||
|
|
#ifdef AF_INET6
|
||
|
|
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. */
|
||
|
|
#endif
|
||
|
|
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 */
|
||
|
|
}
|
||
|
|
|
||
|
|
dispbuflen = snprintf(dispbuf, sizeof(dispbuf), "%d", display);
|
||
|
|
if(dispbuflen < 0)
|
||
|
|
return 0;
|
||
|
|
/* snprintf may have truncate our text */
|
||
|
|
dispbuflen = MIN(dispbuflen, sizeof(dispbuf) - 1);
|
||
|
|
|
||
|
|
if (family == FamilyLocal) {
|
||
|
|
if (gethostname(hostnamebuf, sizeof(hostnamebuf)) == -1)
|
||
|
|
return 0; /* do not know own hostname */
|
||
|
|
addr = hostnamebuf;
|
||
|
|
addrlen = strlen(addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
return XauGetBestAuthByAddr (family,
|
||
|
|
(unsigned short) addrlen, addr,
|
||
|
|
(unsigned short) dispbuflen, dispbuf,
|
||
|
|
N_AUTH_PROTOS, authnames, authnameslen);
|
||
|
|
}
|
||
|
|
|
||
|
|
#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;
|
||
|
|
#ifdef AF_INET6
|
||
|
|
case AF_INET6:
|
||
|
|
/*block*/ {
|
||
|
|
struct sockaddr_in6 *si6 = (struct sockaddr_in6 *) sockname;
|
||
|
|
if(IN6_IS_ADDR_V4MAPPED(SIN6_ADDR(sockname)))
|
||
|
|
{
|
||
|
|
do_append(info->data, &j, &si6->sin6_addr.s6_addr[12], 4);
|
||
|
|
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;
|
||
|
|
#endif
|
||
|
|
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 */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* `sockaddr_un.sun_path' typical size usually ranges between 92 and 108 */
|
||
|
|
#define INITIAL_SOCKNAME_SLACK 108
|
||
|
|
|
||
|
|
/* Return a dynamically allocated socket address structure according
|
||
|
|
to the value returned by either getpeername() or getsockname()
|
||
|
|
(according to POSIX, applications should not assume a particular
|
||
|
|
length for `sockaddr_un.sun_path') */
|
||
|
|
static struct sockaddr *get_peer_sock_name(int (*socket_func)(int,
|
||
|
|
struct sockaddr *,
|
||
|
|
socklen_t *),
|
||
|
|
int fd)
|
||
|
|
{
|
||
|
|
socklen_t socknamelen = sizeof(struct sockaddr) + INITIAL_SOCKNAME_SLACK;
|
||
|
|
socklen_t actual_socknamelen = socknamelen;
|
||
|
|
struct sockaddr *sockname = malloc(socknamelen);
|
||
|
|
|
||
|
|
if (sockname == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
/* Both getpeername() and getsockname() truncates sockname if
|
||
|
|
there is not enough space and set the required length in
|
||
|
|
actual_socknamelen */
|
||
|
|
if (socket_func(fd, sockname, &actual_socknamelen) == -1)
|
||
|
|
goto sock_or_realloc_error;
|
||
|
|
|
||
|
|
if (actual_socknamelen > socknamelen)
|
||
|
|
{
|
||
|
|
struct sockaddr *new_sockname = NULL;
|
||
|
|
socknamelen = actual_socknamelen;
|
||
|
|
|
||
|
|
if ((new_sockname = realloc(sockname, actual_socknamelen)) == NULL)
|
||
|
|
goto sock_or_realloc_error;
|
||
|
|
|
||
|
|
sockname = new_sockname;
|
||
|
|
|
||
|
|
if (socket_func(fd, sockname, &actual_socknamelen) == -1 ||
|
||
|
|
actual_socknamelen > socknamelen)
|
||
|
|
goto sock_or_realloc_error;
|
||
|
|
}
|
||
|
|
|
||
|
|
return sockname;
|
||
|
|
|
||
|
|
sock_or_realloc_error:
|
||
|
|
free(sockname);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
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 */
|
||
|
|
struct sockaddr *sockname = NULL;
|
||
|
|
int gotsockname = 0;
|
||
|
|
Xauth *authptr = 0;
|
||
|
|
int ret = 1;
|
||
|
|
|
||
|
|
/* Some systems like hpux or Hurd do not expose peer names
|
||
|
|
* for UNIX Domain Sockets, but this is irrelevant,
|
||
|
|
* since compute_auth() ignores the peer name in this
|
||
|
|
* case anyway.*/
|
||
|
|
if ((sockname = get_peer_sock_name(getpeername, fd)) == NULL)
|
||
|
|
{
|
||
|
|
if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
|
||
|
|
return 0; /* can only authenticate sockets */
|
||
|
|
if (sockname->sa_family != AF_UNIX)
|
||
|
|
{
|
||
|
|
free(sockname);
|
||
|
|
return 0; /* except for AF_UNIX, sockets should have peernames */
|
||
|
|
}
|
||
|
|
gotsockname = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
authptr = get_authptr(sockname, display);
|
||
|
|
if (authptr == 0)
|
||
|
|
{
|
||
|
|
free(sockname);
|
||
|
|
return 0; /* cannot find good auth data */
|
||
|
|
}
|
||
|
|
|
||
|
|
info->namelen = memdup(&info->name, authptr->name, authptr->name_length);
|
||
|
|
if (!info->namelen)
|
||
|
|
goto no_auth; /* out of memory */
|
||
|
|
|
||
|
|
if (!gotsockname)
|
||
|
|
{
|
||
|
|
free(sockname);
|
||
|
|
|
||
|
|
if ((sockname = get_peer_sock_name(getsockname, fd)) == NULL)
|
||
|
|
{
|
||
|
|
free(info->name);
|
||
|
|
goto no_auth; /* can only authenticate sockets */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = compute_auth(info, authptr, sockname);
|
||
|
|
if(!ret)
|
||
|
|
{
|
||
|
|
free(info->name);
|
||
|
|
goto no_auth; /* cannot build auth record */
|
||
|
|
}
|
||
|
|
|
||
|
|
free(sockname);
|
||
|
|
sockname = NULL;
|
||
|
|
|
||
|
|
XauDisposeAuth(authptr);
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
no_auth:
|
||
|
|
free(sockname);
|
||
|
|
|
||
|
|
info->name = 0;
|
||
|
|
info->namelen = 0;
|
||
|
|
XauDisposeAuth(authptr);
|
||
|
|
return 0;
|
||
|
|
}
|