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5cf4bf36f082fc60ea554fdb258fe1adf33da53e
heimdal/appl/kx/common.c
Love Hörnquist Åstrand 5e969ca2b3 fix unconst and shadow warnings 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15600 ec53bebd-3082-4978-b11e-865c3cabbd6b
2005-07-09 02:19:10 +00:00

818 lines
19 KiB
C
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/*
* Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kx.h"
RCSID("$Id$");
char x_socket[MaxPathLen];
u_int32_t display_num;
char display[MaxPathLen];
int display_size = sizeof(display);
char xauthfile[MaxPathLen];
int xauthfile_size = sizeof(xauthfile);
u_char cookie[16];
size_t cookie_len = sizeof(cookie);
#ifndef X_UNIX_PATH
#define X_UNIX_PATH "/tmp/.X11-unix/X"
#endif
#ifndef X_PIPE_PATH
#define X_PIPE_PATH "/tmp/.X11-pipe/X"
#endif
/*
* Allocate a unix domain socket in `s' for display `dpy' and with
* filename `pattern'
*
* 0 if all is OK
* -1 if bind failed badly
* 1 if dpy is already used */
static int
try_socket (struct x_socket *s, int dpy, const char *pattern)
{
struct sockaddr_un addr;
int fd;
fd = socket (AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
err (1, "socket AF_UNIX");
memset (&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
snprintf (addr.sun_path, sizeof(addr.sun_path), pattern, dpy);
if(bind(fd,
(struct sockaddr *)&addr,
sizeof(addr)) < 0) {
close (fd);
if (errno == EADDRINUSE ||
errno == EACCES /* Cray return EACCESS */
#ifdef ENOTUNIQ
|| errno == ENOTUNIQ /* bug in Solaris 2.4 */
#endif
)
return 1;
else
return -1;
}
s->fd = fd;
s->pathname = strdup (addr.sun_path);
if (s->pathname == NULL)
errx (1, "strdup: out of memory");
s->flags = UNIX_SOCKET;
return 0;
}
#ifdef MAY_HAVE_X11_PIPES
/*
* Allocate a stream (masqueraded as a named pipe)
*
* 0 if all is OK
* -1 if bind failed badly
* 1 if dpy is already used
*/
static int
try_pipe (struct x_socket *s, int dpy, const char *pattern)
{
char path[MAXPATHLEN];
int ret;
int fd;
int pipefd[2];
snprintf (path, sizeof(path), pattern, dpy);
fd = open (path, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (fd < 0) {
if (errno == EEXIST)
return 1;
else
return -1;
}
close (fd);
ret = pipe (pipefd);
if (ret < 0)
err (1, "pipe");
ret = ioctl (pipefd[1], I_PUSH, "connld");
if (ret < 0) {
if(errno == ENOSYS)
return -1;
err (1, "ioctl I_PUSH");
}
ret = fattach (pipefd[1], path);
if (ret < 0)
err (1, "fattach %s", path);
s->fd = pipefd[0];
close (pipefd[1]);
s->pathname = strdup (path);
if (s->pathname == NULL)
errx (1, "strdup: out of memory");
s->flags = STREAM_PIPE;
return 0;
}
#endif /* MAY_HAVE_X11_PIPES */
/*
* Try to create a TCP socket in `s' corresponding to display `dpy'.
*
* 0 if all is OK
* -1 if bind failed badly
* 1 if dpy is already used
*/
static int
try_tcp (struct x_socket *s, int dpy)
{
struct sockaddr_in tcpaddr;
struct in_addr local;
int one = 1;
int fd;
memset(&local, 0, sizeof(local));
local.s_addr = htonl(INADDR_LOOPBACK);
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
err (1, "socket AF_INET");
#if defined(TCP_NODELAY) && defined(HAVE_SETSOCKOPT)
setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, (void *)&one,
sizeof(one));
#endif
memset (&tcpaddr, 0, sizeof(tcpaddr));
tcpaddr.sin_family = AF_INET;
tcpaddr.sin_addr = local;
tcpaddr.sin_port = htons(6000 + dpy);
if (bind (fd, (struct sockaddr *)&tcpaddr,
sizeof(tcpaddr)) < 0) {
close (fd);
if (errno == EADDRINUSE)
return 1;
else
return -1;
}
s->fd = fd;
s->pathname = NULL;
s->flags = TCP;
return 0;
}
/*
* The potential places to create unix sockets.
*/
static char *x_sockets[] = {
X_UNIX_PATH "%u",
"/var/X/.X11-unix/X" "%u",
"/usr/spool/sockets/X11/" "%u",
NULL
};
/*
* Dito for stream pipes.
*/
#ifdef MAY_HAVE_X11_PIPES
static char *x_pipes[] = {
X_PIPE_PATH "%u",
"/var/X/.X11-pipe/X" "%u",
NULL
};
#endif
/*
* Create the directory corresponding to dirname of `path' or fail.
*/
static void
try_mkdir (const char *path)
{
char *dir;
char *p;
int oldmask;
if((dir = strdup (path)) == NULL)
errx (1, "strdup: out of memory");
p = strrchr (dir, '/');
if (p)
*p = '\0';
oldmask = umask(0);
mkdir (dir, 01777);
umask (oldmask);
free (dir);
}
/*
* Allocate a display, returning the number of sockets in `number' and
* all the corresponding sockets in `sockets'. If `tcp_socket' is
* true, also allcoaet a TCP socket.
*
* The return value is the display allocated or -1 if an error occurred.
*/
int
get_xsockets (int *number, struct x_socket **sockets, int tcp_socket)
{
int dpy;
struct x_socket *s;
int n;
int i;
s = malloc (sizeof(*s) * 5);
if (s == NULL)
errx (1, "malloc: out of memory");
try_mkdir (X_UNIX_PATH);
try_mkdir (X_PIPE_PATH);
for(dpy = 4; dpy < 256; ++dpy) {
char **path;
int tmp = 0;
n = 0;
for (path = x_sockets; *path; ++path) {
tmp = try_socket (&s[n], dpy, *path);
if (tmp == -1) {
if (errno != ENOTDIR && errno != ENOENT)
return -1;
} else if (tmp == 1) {
while(--n >= 0) {
close (s[n].fd);
free (s[n].pathname);
}
break;
} else if (tmp == 0)
++n;
}
if (tmp == 1)
continue;
#ifdef MAY_HAVE_X11_PIPES
for (path = x_pipes; *path; ++path) {
tmp = try_pipe (&s[n], dpy, *path);
if (tmp == -1) {
if (errno != ENOTDIR && errno != ENOENT && errno != ENOSYS)
return -1;
} else if (tmp == 1) {
while (--n >= 0) {
close (s[n].fd);
free (s[n].pathname);
}
break;
} else if (tmp == 0)
++n;
}
if (tmp == 1)
continue;
#endif
if (tcp_socket) {
tmp = try_tcp (&s[n], dpy);
if (tmp == -1)
return -1;
else if (tmp == 1) {
while (--n >= 0) {
close (s[n].fd);
free (s[n].pathname);
}
break;
} else if (tmp == 0)
++n;
}
break;
}
if (dpy == 256)
errx (1, "no free x-servers");
for (i = 0; i < n; ++i)
if (s[i].flags & LISTENP
&& listen (s[i].fd, SOMAXCONN) < 0)
err (1, "listen %s", s[i].pathname ? s[i].pathname : "tcp");
*number = n;
*sockets = s;
return dpy;
}
/*
* Change owner on the `n' sockets in `sockets' to `uid', `gid'.
* Return 0 is succesful or -1 if an error occurred.
*/
int
chown_xsockets (int n, struct x_socket *sockets, uid_t uid, gid_t gid)
{
int i;
for (i = 0; i < n; ++i)
if (sockets[i].pathname != NULL)
if (chown (sockets[i].pathname, uid, gid) < 0)
return -1;
return 0;
}
/*
* Connect to local display `dnr' with local transport or TCP.
* Return a file descriptor.
*/
int
connect_local_xsocket (unsigned dnr)
{
int fd;
char **path;
for (path = x_sockets; *path; ++path) {
struct sockaddr_un addr;
fd = socket (AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
break;
memset (&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
snprintf (addr.sun_path, sizeof(addr.sun_path), *path, dnr);
if (connect (fd, (struct sockaddr *)&addr, sizeof(addr)) == 0)
return fd;
close(fd);
}
{
struct sockaddr_in addr;
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0)
err (1, "socket AF_INET");
memset (&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
addr.sin_port = htons(6000 + dnr);
if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) == 0)
return fd;
close(fd);
}
err (1, "connecting to local display %u", dnr);
}
/*
* Create a cookie file with a random cookie for the localhost. The
* file name will be stored in `xauthfile' (but not larger than
* `xauthfile_size'), and the cookie returned in `cookie', `cookie_sz'.
* Return 0 if succesful, or errno.
*/
int
create_and_write_cookie (char *file,
size_t file_size,
u_char *cookie_buf,
size_t cookie_sz)
{
Xauth auth;
char tmp[64];
int fd;
FILE *f;
char hostname[MaxHostNameLen];
int saved_errno;
gethostname (hostname, sizeof(hostname));
auth.family = FamilyLocal;
auth.address = hostname;
auth.address_length = strlen(auth.address);
snprintf (tmp, sizeof(tmp), "%d", display_num);
auth.number_length = strlen(tmp);
auth.number = tmp;
auth.name = COOKIE_TYPE;
auth.name_length = strlen(auth.name);
auth.data_length = cookie_sz;
auth.data = (char*)cookie_buf;
#ifdef KRB5
krb5_generate_random_block (cookie_buf, cookie_sz);
#else
krb_generate_random_block (cookie_buf, cookie_sz);
#endif
strlcpy(file, "/tmp/AXXXXXX", file_size);
fd = mkstemp(file);
if(fd < 0) {
saved_errno = errno;
syslog(LOG_ERR, "create_and_write_cookie: mkstemp: %m");
return saved_errno;
}
f = fdopen(fd, "r+");
if(f == NULL){
saved_errno = errno;
close(fd);
return errno;
}
if(XauWriteAuth(f, &auth) == 0) {
saved_errno = errno;
fclose(f);
return saved_errno;
}
/*
* I would like to write a cookie for localhost:n here, but some
* stupid code in libX11 will not look for cookies of that type,
* so we are forced to use FamilyWild instead.
*/
auth.family = FamilyWild;
auth.address_length = 0;
if (XauWriteAuth(f, &auth) == 0) {
saved_errno = errno;
fclose (f);
return saved_errno;
}
if(fclose(f))
return errno;
return 0;
}
/*
* Verify and remove cookies. Read and parse a X-connection from
* `fd'. Check the cookie used is the same as in `cookie'. Remove the
* cookie and copy the rest of it to `sock'.
* Expect cookies iff cookiesp.
* Return 0 iff ok.
*
* The protocol is as follows:
*
* C->S: [Bl] 1
* unused 1
* protocol major version 2
* protocol minor version 2
* length of auth protocol name(n) 2
* length of auth protocol data 2
* unused 2
* authorization protocol name n
* pad pad(n)
* authorization protocol data d
* pad pad(d)
*
* S->C: Failed
* 0 1
* length of reason 1
* protocol major version 2
* protocol minor version 2
* length in 4 bytes unit of
* additional data (n+p)/4 2
* reason n
* unused p = pad(n)
*/
int
verify_and_remove_cookies (int fd, int sock, int cookiesp)
{
u_char beg[12];
int bigendianp;
unsigned n, d, npad, dpad;
char *protocol_name, *protocol_data;
u_char zeros[6] = {0, 0, 0, 0, 0, 0};
u_char refused[20] = {0, 10,
0, 0, /* protocol major version */
0, 0, /* protocol minor version */
0, 0, /* length of additional data / 4 */
'b', 'a', 'd', ' ', 'c', 'o', 'o', 'k', 'i', 'e',
0, 0};
if (net_read (fd, beg, sizeof(beg)) != sizeof(beg))
return 1;
if (net_write (sock, beg, 6) != 6)
return 1;
bigendianp = beg[0] == 'B';
if (bigendianp) {
n = (beg[6] << 8) | beg[7];
d = (beg[8] << 8) | beg[9];
} else {
n = (beg[7] << 8) | beg[6];
d = (beg[9] << 8) | beg[8];
}
npad = (4 - (n % 4)) % 4;
dpad = (4 - (d % 4)) % 4;
protocol_name = malloc(n + npad);
if (n + npad != 0 && protocol_name == NULL)
return 1;
protocol_data = malloc(d + dpad);
if (d + dpad != 0 && protocol_data == NULL) {
free (protocol_name);
return 1;
}
if (net_read (fd, protocol_name, n + npad) != n + npad)
goto fail;
if (net_read (fd, protocol_data, d + dpad) != d + dpad)
goto fail;
if (cookiesp) {
if (strncmp (protocol_name, COOKIE_TYPE, strlen(COOKIE_TYPE)) != 0)
goto refused;
if (d != cookie_len ||
memcmp (protocol_data, cookie, cookie_len) != 0)
goto refused;
}
free (protocol_name);
free (protocol_data);
if (net_write (sock, zeros, 6) != 6)
return 1;
return 0;
refused:
refused[2] = beg[2];
refused[3] = beg[3];
refused[4] = beg[4];
refused[5] = beg[5];
if (bigendianp)
refused[7] = 3;
else
refused[6] = 3;
net_write (fd, refused, sizeof(refused));
fail:
free (protocol_name);
free (protocol_data);
return 1;
}
/*
* Return 0 iff `cookie' is compatible with the cookie for the
* localhost with name given in `ai' (or `hostname') and display
* number in `disp_nr'.
*/
static int
match_local_auth (Xauth* auth,
struct addrinfo *ai, const char *hostname, int disp_nr)
{
int auth_disp;
char *tmp_disp;
struct addrinfo *a;
tmp_disp = malloc(auth->number_length + 1);
if (tmp_disp == NULL)
return -1;
memcpy(tmp_disp, auth->number, auth->number_length);
tmp_disp[auth->number_length] = '\0';
auth_disp = atoi(tmp_disp);
free (tmp_disp);
if (auth_disp != disp_nr)
return 1;
for (a = ai; a != NULL; a = a->ai_next) {
if ((auth->family == FamilyLocal
|| auth->family == FamilyWild)
&& a->ai_canonname != NULL
&& strncmp (auth->address,
a->ai_canonname,
auth->address_length) == 0)
return 0;
}
if (hostname != NULL
&& (auth->family == FamilyLocal
|| auth->family == FamilyWild)
&& strncmp (auth->address, hostname, auth->address_length) == 0)
return 0;
return 1;
}
/*
* Find `our' cookie from the cookie file `f' and return it or NULL.
*/
static Xauth*
find_auth_cookie (FILE *f)
{
Xauth *ret = NULL;
char local_hostname[MaxHostNameLen];
char *display_str = getenv("DISPLAY");
char d[MaxHostNameLen + 4];
char *colon;
struct addrinfo *ai;
struct addrinfo hints;
int disp;
int error;
if(display_str == NULL)
display_str = ":0";
strlcpy(d, display_str, sizeof(d));
display_str = d;
colon = strchr (display_str, ':');
if (colon == NULL)
disp = 0;
else {
*colon = '\0';
disp = atoi (colon + 1);
}
if (strcmp (display_str, "") == 0
|| strncmp (display_str, "unix", 4) == 0
|| strncmp (display_str, "localhost", 9) == 0) {
gethostname (local_hostname, sizeof(local_hostname));
display_str = local_hostname;
}
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
error = getaddrinfo (display_str, NULL, &hints, &ai);
if (error)
ai = NULL;
for (; (ret = XauReadAuth (f)) != NULL; XauDisposeAuth(ret)) {
if (match_local_auth (ret, ai, display_str, disp) == 0) {
if (ai != NULL)
freeaddrinfo (ai);
return ret;
}
}
if (ai != NULL)
freeaddrinfo (ai);
return NULL;
}
/*
* Get rid of the cookie that we were sent and get the correct one
* from our own cookie file instead.
*/
int
replace_cookie(int xserver, int fd, char *filename, int cookiesp) /* XXX */
{
u_char beg[12];
int bigendianp;
unsigned n, d, npad, dpad;
FILE *f;
u_char zeros[6] = {0, 0, 0, 0, 0, 0};
if (net_read (fd, beg, sizeof(beg)) != sizeof(beg))
return 1;
if (net_write (xserver, beg, 6) != 6)
return 1;
bigendianp = beg[0] == 'B';
if (bigendianp) {
n = (beg[6] << 8) | beg[7];
d = (beg[8] << 8) | beg[9];
} else {
n = (beg[7] << 8) | beg[6];
d = (beg[9] << 8) | beg[8];
}
if (n != 0 || d != 0)
return 1;
f = fopen(filename, "r");
if (f != NULL) {
Xauth *auth = find_auth_cookie (f);
u_char len[6] = {0, 0, 0, 0, 0, 0};
fclose (f);
if (auth != NULL) {
n = auth->name_length;
d = auth->data_length;
} else {
n = 0;
d = 0;
}
if (bigendianp) {
len[0] = n >> 8;
len[1] = n & 0xFF;
len[2] = d >> 8;
len[3] = d & 0xFF;
} else {
len[0] = n & 0xFF;
len[1] = n >> 8;
len[2] = d & 0xFF;
len[3] = d >> 8;
}
if (net_write (xserver, len, 6) != 6) {
XauDisposeAuth(auth);
return 1;
}
if(n != 0 && net_write (xserver, auth->name, n) != n) {
XauDisposeAuth(auth);
return 1;
}
npad = (4 - (n % 4)) % 4;
if (npad && net_write (xserver, zeros, npad) != npad) {
XauDisposeAuth(auth);
return 1;
}
if (d != 0 && net_write (xserver, auth->data, d) != d) {
XauDisposeAuth(auth);
return 1;
}
XauDisposeAuth(auth);
dpad = (4 - (d % 4)) % 4;
if (dpad && net_write (xserver, zeros, dpad) != dpad)
return 1;
} else {
if(net_write(xserver, zeros, 6) != 6)
return 1;
}
return 0;
}
/*
* Some simple controls on the address and corresponding socket
*/
int
suspicious_address (int sock, struct sockaddr *addr)
{
char data[40];
socklen_t len = sizeof(data);
switch (addr->sa_family) {
case AF_INET:
return ((struct sockaddr_in *)addr)->sin_addr.s_addr !=
htonl(INADDR_LOOPBACK)
#if defined(IP_OPTIONS) && defined(HAVE_GETSOCKOPT)
|| getsockopt (sock, IPPROTO_IP, IP_OPTIONS, data, &len) < 0
|| len != 0
#endif
;
break;
#ifdef HAVE_IPV6
case AF_INET6:
/* XXX check route headers */
return !IN6_IS_ADDR_LOOPBACK(&((struct sockaddr_in6*)addr)->sin6_addr);
#endif
default:
return 1;
}
}
/*
* This really sucks, but these functions are used and if we're not
* linking against libkrb they don't exist. Using the heimdal storage
* functions will not work either cause we do not always link with
* libkrb5 either.
*/
#ifndef KRB4
int
krb_get_int(void *f, u_int32_t *to, int size, int lsb)
{
int i;
unsigned char *from = (unsigned char *)f;
*to = 0;
if(lsb){
for(i = size-1; i >= 0; i--)
*to = (*to << 8) | from[i];
}else{
for(i = 0; i < size; i++)
*to = (*to << 8) | from[i];
}
return size;
}
int
krb_put_int(u_int32_t from, void *to, size_t rem, int size)
{
int i;
unsigned char *p = (unsigned char *)to;
if (rem < size)
return -1;
for(i = size - 1; i >= 0; i--){
p[i] = from & 0xff;
from >>= 8;
}
return size;
}
#endif /* !KRB4 */
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