70cea0ce07
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1529 ec53bebd-3082-4978-b11e-865c3cabbd6b
437 lines
11 KiB
C
437 lines
11 KiB
C
/*
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* Copyright (c) 1995, 1996 Kungliga Tekniska Högskolan (Royal Institute
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* of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kx.h"
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RCSID("$Id$");
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char x_socket[MaxPathLen];
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u_int32_t display_num;
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char display[MaxPathLen];
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int display_size = sizeof(display);
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char xauthfile[MaxPathLen];
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int xauthfile_size = sizeof(xauthfile);
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u_char cookie[16];
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size_t cookie_len = sizeof(cookie);
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static int
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do_enccopy (int fd1, int fd2, int mode, des_cblock *iv,
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des_key_schedule schedule, int *num)
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{
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int ret;
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u_char buf[BUFSIZ];
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ret = read (fd1, buf, sizeof(buf));
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if (ret == 0)
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return 0;
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if (ret < 0) {
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warn ("read");
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return ret;
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}
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#ifndef NOENCRYPTION
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des_cfb64_encrypt (buf, buf, ret, schedule, iv,
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num, mode);
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#endif
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ret = krb_net_write (fd2, buf, ret);
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if (ret < 0) {
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warn ("write");
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return ret;
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}
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return 1;
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}
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/*
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* Copy data from `fd1' to `fd2', encrypting it. Data in the other
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* direction is of course, decrypted.
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*/
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int
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copy_encrypted (int fd1, int fd2, des_cblock *iv,
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des_key_schedule schedule)
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{
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des_cblock iv1, iv2;
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int num1 = 0, num2 = 0;
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memcpy (&iv1, iv, sizeof(iv1));
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memcpy (&iv2, iv, sizeof(iv2));
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for (;;) {
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fd_set fdset;
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int ret;
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FD_ZERO(&fdset);
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FD_SET(fd1, &fdset);
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FD_SET(fd2, &fdset);
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ret = select (max(fd1, fd2)+1, &fdset, NULL, NULL, NULL);
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if (ret < 0 && errno != EINTR) {
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warn ("select");
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return 1;
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}
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if (FD_ISSET(fd1, &fdset)) {
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ret = do_enccopy (fd1, fd2, DES_ENCRYPT, &iv1, schedule, &num1);
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if (ret <= 0)
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return ret;
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}
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if (FD_ISSET(fd2, &fdset)) {
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ret = do_enccopy (fd2, fd1, DES_DECRYPT, &iv2, schedule, &num2);
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if (ret <= 0)
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return ret;
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}
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}
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}
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#ifndef X_UNIX_PATH
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#define X_UNIX_PATH "/tmp/.X11-unix/X"
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#endif
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#ifndef INADDR_LOOPBACK
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#define INADDR_LOOPBACK 0x7f000001
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#endif
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/*
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* Allocate and listen on a local X server socket and a TCP socket.
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* Return the display number.
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*/
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int
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get_xsockets (int *unix_socket, int *tcp_socket)
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{
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int unixfd, tcpfd = -1;
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struct sockaddr_un unixaddr;
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struct sockaddr_in tcpaddr;
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int dpy;
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int oldmask;
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struct in_addr local;
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char *dir, *p;
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dir = strdup (X_UNIX_PATH);
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p = strrchr (dir, '/');
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if (p)
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*p = '\0';
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oldmask = umask(0);
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mkdir (dir, 01777);
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chmod (dir, 01777);
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umask (oldmask);
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free (dir);
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local.s_addr = htonl(INADDR_LOOPBACK);
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for(dpy = 4; dpy < 256; ++dpy) {
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unixfd = socket (AF_UNIX, SOCK_STREAM, 0);
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if (unixfd < 0)
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err (1, "socket AF_UNIX");
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memset (&unixaddr, 0, sizeof(unixaddr));
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unixaddr.sun_family = AF_UNIX;
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sprintf (unixaddr.sun_path, X_UNIX_PATH "%u", dpy);
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if(bind(unixfd,
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(struct sockaddr *)&unixaddr,
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sizeof(unixaddr)) < 0) {
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close (unixfd);
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if (errno == EADDRINUSE ||
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errno == EACCES) /* Cray return EACCESS */
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continue;
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else
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return -1;
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}
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if (tcp_socket) {
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int one = 1;
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tcpfd = socket (AF_INET, SOCK_STREAM, 0);
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if (tcpfd < 0)
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err (1, "socket AF_INET");
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#if defined(TCP_NODELAY) && defined(HAVE_SETSOCKOPT)
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setsockopt (tcpfd, IPPROTO_TCP, TCP_NODELAY, (void *)&one,
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sizeof(one));
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#endif
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memset (&tcpaddr, 0, sizeof(tcpaddr));
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tcpaddr.sin_family = AF_INET;
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tcpaddr.sin_addr = local;
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tcpaddr.sin_port = htons(6000 + dpy);
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if (bind (tcpfd, (struct sockaddr *)&tcpaddr,
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sizeof(tcpaddr)) < 0) {
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close (unixfd);
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close (tcpfd);
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if (errno == EADDRINUSE)
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continue;
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else
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return -1;
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}
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}
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break;
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}
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if (dpy == 256)
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errx (1, "no free x-servers");
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if (listen (unixfd, SOMAXCONN) < 0)
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err (1, "listen");
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if (tcp_socket)
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if (listen (tcpfd, SOMAXCONN) < 0)
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err (1, "listen");
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strcpy(x_socket, unixaddr.sun_path);
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*unix_socket = unixfd;
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if (tcp_socket)
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*tcp_socket = tcpfd;
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return dpy;
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}
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/*
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*
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*/
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int
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connect_local_xsocket (unsigned dnr)
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{
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int fd;
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struct sockaddr_un addr;
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fd = socket (AF_UNIX, SOCK_STREAM, 0);
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if (fd < 0)
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err (1, "socket AF_UNIX");
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addr.sun_family = AF_UNIX;
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sprintf (addr.sun_path, "/tmp/.X11-unix/X%u", dnr);
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if (connect (fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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err (1, "connect");
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return fd;
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}
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int
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create_and_write_cookie (char *xauthfile,
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u_char *cookie,
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size_t sz)
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{
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Xauth auth;
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char tmp[64];
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FILE *f;
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char hostname[MaxHostNameLen];
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struct in_addr loopback;
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struct hostent *h;
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k_gethostname (hostname, sizeof(hostname));
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loopback.s_addr = htonl(INADDR_LOOPBACK);
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auth.family = FamilyLocal;
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auth.address = hostname;
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auth.address_length = strlen(auth.address);
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sprintf (tmp, "%d", display_num);
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auth.number_length = strlen(tmp);
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auth.number = tmp;
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auth.name = COOKIE_TYPE;
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auth.name_length = strlen(auth.name);
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auth.data_length = sz;
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auth.data = (char*)cookie;
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des_rand_data (cookie, sz);
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f = fopen(xauthfile, "w");
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if (f == NULL)
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return 1;
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if(XauWriteAuth(f, &auth) == 0) {
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fclose(f);
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return 1;
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}
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h = gethostbyname (hostname);
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if (h == NULL) {
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fclose (f);
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return 1;
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}
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/*
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* I would like to write a cookie for localhost:n here, but some
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* stupid code in libX11 will not look for cookies of that type,
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* so we are forced to use FamilyWild instead.
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*/
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auth.family = FamilyWild;
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auth.address_length = 0;
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#if 0 /* XXX */
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auth.address = (char *)&loopback;
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auth.address_length = sizeof(loopback);
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#endif
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if (XauWriteAuth(f, &auth) == 0) {
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fclose (f);
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return 1;
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}
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if(fclose(f))
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return 1;
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return 0;
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}
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/*
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* Verify and remove cookies. Read and parse a X-connection from
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* `fd'. Check the cookie used is the same as in `cookie'. Remove the
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* cookie and copy the rest of it to `sock'.
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* Return 0 iff ok.
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*/
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int
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verify_and_remove_cookies (int fd, int sock)
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{
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u_char beg[12];
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int bigendianp;
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unsigned n, d, npad, dpad;
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char *protocol_name, *protocol_data;
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u_char zeros[6] = {0, 0, 0, 0, 0, 0};
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if (krb_net_read (fd, beg, sizeof(beg)) != sizeof(beg))
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return 1;
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if (krb_net_write (sock, beg, 6) != 6)
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return 1;
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bigendianp = beg[0] == 'B';
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if (bigendianp) {
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n = (beg[6] << 8) | beg[7];
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d = (beg[8] << 8) | beg[9];
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} else {
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n = (beg[7] << 8) | beg[6];
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d = (beg[9] << 8) | beg[8];
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}
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npad = (4 - (n % 4)) % 4;
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dpad = (4 - (d % 4)) % 4;
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protocol_name = malloc(n + npad);
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protocol_data = malloc(d + dpad);
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if (krb_net_read (fd, protocol_name, n + npad) != n + npad)
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return 1;
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if (krb_net_read (fd, protocol_data, d + dpad) != d + dpad)
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return 1;
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if (strncmp (protocol_name, COOKIE_TYPE, strlen(COOKIE_TYPE)) != 0)
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return 1;
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if (d != cookie_len ||
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memcmp (protocol_data, cookie, cookie_len) != 0)
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return 1;
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if (krb_net_write (sock, zeros, 6) != 6)
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return 1;
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return 0;
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}
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/*
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* Get rid of the cookie that we were sent and get the correct one
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* from our own cookie file instead.
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*/
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int
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replace_cookie(int xserver, int fd, char *filename)
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{
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u_char beg[12];
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int bigendianp;
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unsigned n, d, npad, dpad;
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Xauth *auth;
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FILE *f;
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u_char zeros[6] = {0, 0, 0, 0, 0, 0};
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if (krb_net_read (fd, beg, sizeof(beg)) != sizeof(beg))
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return 1;
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if (krb_net_write (xserver, beg, 6) != 6)
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return 1;
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bigendianp = beg[0] == 'B';
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if (bigendianp) {
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n = (beg[6] << 8) | beg[7];
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d = (beg[8] << 8) | beg[9];
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} else {
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n = (beg[7] << 8) | beg[6];
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d = (beg[9] << 8) | beg[8];
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}
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if (n != 0 || d != 0)
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return 1;
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f = fopen(filename, "r");
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if (f) {
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u_char len[6] = {0, 0, 0, 0, 0, 0};
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auth = XauReadAuth(f);
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fclose(f);
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n = auth->name_length;
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d = auth->data_length;
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if (bigendianp) {
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len[0] = n >> 8;
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len[1] = n & 0xFF;
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len[2] = d >> 8;
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len[3] = d & 0xFF;
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} else {
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len[0] = n & 0xFF;
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len[1] = n >> 8;
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len[2] = d & 0xFF;
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len[3] = d >> 8;
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}
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if (krb_net_write (xserver, len, 6) != 6)
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return 1;
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if(krb_net_write (xserver, auth->name, n) != n)
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return 1;
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npad = (4 - (n % 4)) % 4;
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if (npad) {
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if (krb_net_write (xserver, zeros, npad) != npad)
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return 1;
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}
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if (krb_net_write (xserver, auth->data, d) != d)
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return 1;
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dpad = (4 - (d % 4)) % 4;
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if (dpad) {
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if (krb_net_write (xserver, zeros, dpad) != dpad)
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return 1;
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}
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XauDisposeAuth(auth);
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} else {
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if(krb_net_write(xserver, zeros, 6) != 6)
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return 1;
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}
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return 0;
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}
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/*
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* Some simple controls on the address and corresponding socket
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*/
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int
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suspicious_address (int sock, struct sockaddr_in addr)
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{
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char data[40];
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int len = sizeof(data);
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return addr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
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#if defined(IP_OPTIONS) && defined(HAVE_GETSOCKOPT)
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|| getsockopt (sock, IPPROTO_IP, IP_OPTIONS, data, &len) < 0
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|| len != 0
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#endif
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;
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}
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