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libtdevnc/x11vnc/enc.h

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#ifndef _X11VNC_ENC_H
#define _X11VNC_ENC_H
/* -- enc.h -- */
#if 0
:r /home/runge/ultraSC/rc4/ultravnc_dsm_helper.c
#endif
/*
* ultravnc_dsm_helper.c unix/openssl UltraVNC encryption encoder/decoder.
*
* compile via:
cc -O -o ultravnc_dsm_helper ultravnc_dsm_helper.c -lssl -lcrypto
cc -DDBG -O -o ultravnc_dsm_helper ultravnc_dsm_helper.c -lssl -lcrypto
*
* See usage below for how to run it.
*
* Note: since the UltraVNC DSM plugin implementation changes the RFB
* (aka VNC) protocol (extra data is sent), you will *ALSO* need to modify
* your VNC viewer or server to discard (or insert) this extra data.
*
* This tool knows nothing about the RFB protocol: it simply
* encrypts/decrypts a stream using a symmetric cipher, arc4 and aesv2,
* (others have been added, see usage). It could be used as a general
* encrypted tunnel:
*
* any-client <=> ultravnc_dsm_helper <--network--> ultravnc_dsm_helper(reverse mode) <=> any-server
*
* e.g. to connect a non-ultra-dsm-vnc viewer to a non-ultra-dsm-vnc server
*
* -----------------------------------------------------------------------
* Copyright (c) 2008 Karl J. Runge <runge@karlrunge.com>
* All rights reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
* -----------------------------------------------------------------------
*/
static char *usage =
"\n"
"usage: ultravnc_dsm_helper cipher keyfile listenport remotehost:port\n"
"\n"
"e.g.: ultravnc_dsm_helper arc4 ./arc4.key 5901 snoopy.com:5900\n"
"\n"
" cipher: specify 'msrc4', 'msrc4_sc', 'arc4', 'aesv2',\n"
" 'aes-cfb', 'blowfish', or '3des'.\n"
"\n"
" 'msrc4_sc' enables a workaround for UVNC SC -plugin use.\n"
"\n"
" use '.' to have it try to guess the cipher from the keyfile name.\n"
"\n"
" use 'rev:arc4', etc. to reverse the roles of encrypter and decrypter.\n"
" (i.e. if you want to use it for a vnc server, not vnc viewer)\n"
"\n"
" use 'noultra:...' to skip steps involving salt and IV to be compatible\n"
" to be compatible with UltraVNC DSM, i.e. assume a normal symmetric\n"
" cipher at the other end.\n"
"\n"
" use 'noultra:rev:...' if both are to be supplied.\n"
"\n"
" keyfile: file holding the key (16 bytes for arc4 and aesv2, 87 for msrc4)\n"
" E.g. dd if=/dev/random of=./my.key bs=16 count=1\n"
" keyfile can also be pw=<string> to use \"string\" for the key.\n"
"\n"
" listenport: port to listen for incoming connection on. (use 0 to connect\n"
" to stdio, use a negative value to force localhost)\n"
"\n"
" remotehost:port: host and port to connect to. (e.g. ultravnc server)\n"
"\n"
"\n"
" Also: cipher may be cipher@n,m where n is the salt size and m is the\n"
" initialization vector size. E.g. aesv2@8,16\n"
;
/*
* We can also run as a module included into x11vnc (-enc option)
* The includer must set ENC_MODULE and ENC_HAVE_OPENSSL.
*
* Note that when running as a module we still assume we have been
* forked off of the parent process and are communicating back to it
* via a socket. So we still exit(3) at the end or on error. And
* the globals would not work.
*/
#ifdef ENC_MODULE
# define main __enc_main
static char *prog = "enc_helper";
#else
# define ENC_HAVE_OPENSSL 1
static char *prog = "ultravnc_dsm_helper";
#endif
/* unix includes */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifndef INADDR_NONE
#define INADDR_NONE ((in_addr_t) 0xffffffff)
#endif
#if ENC_HAVE_OPENSSL
/* openssl includes */
#include <openssl/evp.h>
#include <openssl/rand.h>
static const EVP_CIPHER *Cipher;
#endif
static char *cipher = NULL; /* name of cipher, e.g. "aesv2" */
static int reverse = 0; /* listening connection */
static int msrc4_sc = 0; /* enables workaround for SC I/II */
static int noultra = 0; /* manage salt and iv differently than ultradsm */
/* The data that was read in from key file (or pw=password) */
static char keydata[1024];
static int keydata_len;
/* Size of salt and IV; based on UltraVNC DSM */
#define SALT 16
#define MSRC4_SALT 11
#define IVEC 16
/* Set default values of salt and IV */
static int salt_size = SALT;
static int ivec_size = IVEC;
/* To track parent and child pids */
static pid_t parent, child;
#define BSIZE 8192
/* Some very verbose debugging stuff I enable for testing */
#ifdef DBG
# include "dbg.h"
#else
# define DEC_CT_DBG(p, n)
# define DEC_PT_DBG(p, n)
# define ENC_CT_DBG(p, n)
# define ENC_PT_DBG(p, n)
# define PRINT_IVEC
# define PRINT_KEYDATA
# define PRINT_KEYSTR_AND_FRIENDS
#endif
static void enc_connections(int, char*, int);
#if !ENC_HAVE_OPENSSL
/* In case we are a module and there is no OpenSSL buildtime support */
extern void enc_do(char *ciph, char *keyfile, char *lport, char *rhp) {
fprintf(stderr, "%s: not compiled with OpenSSL\n", prog);
exit(1);
}
#else
/* If we are a module, enc_do() is the only interface we export. */
/* This works out key type & etc., reads key, calls enc_connections */
extern void enc_do(char *ciph, char *keyfile, char *lport, char *rhp) {
struct stat sb;
char *q, *p, *connect_host;
char tmp[16];
int fd, len, listen_port, connect_port, mbits;
/* check for noultra mode: */
q = ciph;
if (strstr(q, "noultra:") == q) {
noultra = 1;
q += strlen("noultra:");
}
/* check for reverse mode: */
if (strstr(q, "rev:") == q) {
reverse = 1;
q += strlen("rev:");
}
/* work out which cipher and set Cipher to the selected one. */
if (!strcasecmp(q, "msrc4")) {
Cipher = EVP_rc4(); cipher = "msrc4";
} else if (!strcasecmp(q, "msrc4_sc")) {
Cipher = EVP_rc4(); cipher = "msrc4";
msrc4_sc = 1; /* no salt/iv workaround */
} else if (strstr(q, "arc4") == q) {
Cipher = EVP_rc4(); cipher = "arc4";
} else if (strstr(q, "aesv2") == q || strstr(q, "aes-ofb") == q) {
Cipher = EVP_aes_128_ofb(); cipher = "aesv2";
} else if (strstr(q, "aes-cfb") == q) {
Cipher = EVP_aes_128_cfb(); cipher = "aes-cfb";
} else if (strstr(q, "blowfish") == q) {
Cipher = EVP_bf_cfb(); cipher = "blowfish";
} else if (strstr(q, "3des") == q) {
Cipher = EVP_des_ede3_ofb(); cipher = "3des";
} else {
/* otherwise, try to guess cipher from key filename: */
if (strstr(keyfile, "arc4.key")) {
Cipher = EVP_rc4(); cipher = "arc4";
} else if (strstr(keyfile, "rc4.key")) {
Cipher = EVP_rc4(); cipher = "msrc4";
} else if (strstr(keyfile, "aesv2.key")) {
Cipher = EVP_aes_128_ofb(); cipher = "aesv2";
} else if (strstr(keyfile, "aes-cfb.key")) {
Cipher = EVP_aes_128_cfb(); cipher = "aes-cfb";
} else if (strstr(keyfile, "blowfish.key")) {
Cipher = EVP_bf_cfb(); cipher = "blowfish";
} else if (strstr(keyfile, "3des.key")) {
Cipher = EVP_des_ede3_ofb(); cipher = "3des";
} else {
fprintf(stderr, "cannot figure out cipher, supply 'msrc4', 'arc4', or 'aesv2' ...\n");
exit(1);
}
}
/* look for user specified salt and IV sizes at the end: */
p = strchr(q, '@');
if (p) {
int s, v;
if (sscanf(p+1, "%d,%d", &s, &v) == 2) {
if (0 <= s && s <= SALT) {
salt_size = s;
}
if (0 <= v && v <= EVP_MAX_IV_LENGTH) {
ivec_size = v;
}
} else if (sscanf(p+1, "%d", &s) == 1) {
if (0 <= s && s <= SALT) {
salt_size = s;
}
}
}
/* port to listen on (0 => stdio, negative => localhost) */
listen_port = atoi(lport);
/* extract remote hostname and port */
q = strrchr(rhp, ':');
if (q) {
connect_port = atoi(q+1);
*q = '\0';
} else {
/* otherwise guess VNC display 0 ... */
connect_port = 5900;
}
connect_host = strdup(rhp);
/* check for and read in the key file */
if (stat(keyfile, &sb) != 0) {
if (strstr(keyfile, "pw=") == keyfile) {
/* user specified key/password on cmdline */
int i;
len = 0;
for (i=0; i < strlen(keyfile); i++) {
/* load the string to keydata: */
int n = i + strlen("pw=");
keydata[i] = keyfile[n];
if (keyfile[n] == '\0') break;
len++;
}
goto readed_in;
}
perror("stat");
exit(1);
}
if (sb.st_size > 1024) {
fprintf(stderr, "%s: key file too big.\n", prog);
exit(1);
}
fd = open(keyfile, O_RDONLY);
if (fd < 0) {
perror("open");
exit(1);
}
/* read it all in */
len = (int) read(fd, keydata, (size_t) sb.st_size);
if (len != sb.st_size) {
perror("read");
fprintf(stderr, "%s, could not read key file.\n", prog);
exit(1);
}
close(fd);
readed_in:
/* check for ultravnc msrc4 format 'rc4.key' */
mbits = 0;
if (strstr(keydata, "128 bit") == keydata) {
mbits = 128;
} else if (strstr(keydata, " 56 bit") == keydata) {
mbits = 56;
} else if (strstr(keydata, " 40 bit") == keydata) {
mbits = 40;
}
if (mbits > 0) {
/* 4 is for int key length, 12 is for BLOBHEADER. */
int i, offset = strlen("xxx bit") + 4 + 12;
/* the key is stored in reverse order! */
len = mbits/8;
for (i=0; i < len; i++) {
tmp[i] = keydata[offset + len - i - 1];
}
/* clear keydata and then copy the reversed bytes there: */
memset(keydata, 0, sizeof(keydata));
memcpy(keydata, tmp, len);
}
keydata_len = len;
/* initialize random */
RAND_poll();
/*
* Setup connections, then transfer data when they are all
* hooked up.
*/
enc_connections(listen_port, connect_host, connect_port);
}
#endif
#if ENC_HAVE_OPENSSL
/*
* Initialize cipher context and then loop till EOF doing transfer &
* encrypt or decrypt.
*/
static void enc_xfer(int sock_fr, int sock_to, int encrypt) {
/*
* We keep both E and D aspects in case we revert back to a
* single process calling select(2) on all fds...
*/
unsigned char E_keystr[EVP_MAX_KEY_LENGTH];
unsigned char D_keystr[EVP_MAX_KEY_LENGTH];
EVP_CIPHER_CTX E_ctx, D_ctx;
EVP_CIPHER_CTX *ctx;
unsigned char buf[BSIZE], out[BSIZE];
unsigned char *psrc = NULL, *keystr;
unsigned char salt[SALT+1];
unsigned char ivec[EVP_MAX_IV_LENGTH];
int i, cnt, len, n = 0, m, vb = 0, pa = 1, first = 1;
int whoops = 1; /* for the msrc4 problem */
char *encstr;
/* zero the buffers */
memset(buf, 0, BSIZE);
memset(out, 0, BSIZE);
memset(salt, 0, sizeof(salt));
memset(ivec, 0, sizeof(ivec));
memset(E_keystr, 0, sizeof(E_keystr));
memset(D_keystr, 0, sizeof(D_keystr));
if (!strcmp(cipher, "msrc4")) {
salt_size = MSRC4_SALT; /* 11 vs. 16 */
}
if (getenv("ENCRYPT_VERBOSE")) {
vb = 1; /* let user turn on some debugging via env. var. */
}
/*
* reverse mode, e.g. we help a vnc server instead of a viewer.
*/
if (reverse) {
encrypt = (!encrypt);
}
encstr = encrypt ? "encrypt" : "decrypt"; /* string for messages */
if (msrc4_sc) {
whoops = 1;
}
if (encrypt) {
/* encrypter initializes the salt and initialization vector */
/*
* Our salt is 16 bytes but I believe only the first 8
* bytes are used by EVP_BytesToKey(3). Since we send it
* to the other "plugin" we need to keep it 16.
*/
RAND_bytes(salt, salt_size);
RAND_bytes(ivec, ivec_size);
/* place them in the send buffer: */
memcpy(buf, salt, salt_size);
memcpy(buf+salt_size, ivec, ivec_size);
n = salt_size + ivec_size;
ENC_PT_DBG(buf, n);
/* use the encryption context variables below */
ctx = &E_ctx;
keystr = E_keystr;
} else {
/* decrypter needs to read salt + iv from the wire: */
/* sleep 100 ms (TODO: select on fd) */
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
select(1, NULL, NULL, NULL, &tv);
n = read(sock_fr, buf, salt_size+ivec_size+96);
if (n == 0 && salt_size+ivec_size > 0) {
fprintf(stderr, "%s: decrypt finished.\n", prog);
goto finished;
}
if (n < salt_size+ivec_size) {
if (msrc4_sc && n == 12) {
fprintf(stderr, "%s: only %d bytes read. Assuming UVNC Single Click server.\n", prog, n);
} else {
if (n < 0) perror("read");
fprintf(stderr, "%s: could not read enough for salt and ivec: n=%d\n", prog, n);
goto finished;
}
}
DEC_CT_DBG(buf, n);
if (msrc4_sc && n == 12) {
; /* send it as is */
} else {
/* extract them to their buffers: */
memcpy(salt, buf, salt_size);
memcpy(ivec, buf+salt_size, ivec_size);
/* the rest is some encrypted data: */
n = n - salt_size - ivec_size;
psrc = buf + salt_size + ivec_size;
if (n > 0) {
/* copy it down to the start of buf for sending below */
for (i=0; i < n; i++) {
buf[i] = psrc[i];
}
}
}
/* use the decryption context variables below */
ctx = &D_ctx;
keystr = D_keystr;
}
/* debug output */
PRINT_KEYDATA;
PRINT_IVEC;
if (!strcmp(cipher, "msrc4")) {
/* special cases for MSRC4: */
if (whoops) {
fprintf(stderr, "%s: %s - WARNING: MSRC4 mode and IGNORING random salt\n", prog, encstr);
fprintf(stderr, "%s: %s - WARNING: and initialization vector!!\n", prog, encstr);
EVP_CIPHER_CTX_init(ctx);
EVP_CipherInit_ex(ctx, Cipher, NULL, (unsigned char *) keydata, NULL, encrypt);
} else {
/* XXX might not be correct */
exit(1);
EVP_BytesToKey(Cipher, EVP_md5(), NULL, keydata, keydata_len, 1, keystr, ivec);
EVP_CIPHER_CTX_init(ctx);
EVP_CipherInit_ex(ctx, Cipher, NULL, keystr, ivec, encrypt);
}
} else {
unsigned char *in_salt;
if (salt_size <= 0) {
/* let salt_size = 0 mean keep it out of the MD5 */
fprintf(stderr, "%s: %s - WARNING: no salt\n", prog, encstr);
in_salt = NULL;
} else {
in_salt = salt;
}
if (ivec_size < Cipher->iv_len) {
fprintf(stderr, "%s: %s - WARNING: short IV %d < %d\n", prog, encstr, ivec_size, Cipher->iv_len);
}
/* make the hashed value and place in keystr */
/* XXX N.B.: DSM plugin had count=0, and overwrote ivec by not passing NULL iv */
if (noultra && ivec_size > 0) {
EVP_BytesToKey(Cipher, EVP_md5(), in_salt, keydata, keydata_len, 1, keystr, NULL);
} else {
/* even under noultra we overwrite ivec if ivec_size = 0 */
EVP_BytesToKey(Cipher, EVP_md5(), in_salt, keydata, keydata_len, 1, keystr, ivec);
}
/* initialize the context */
EVP_CIPHER_CTX_init(ctx);
/* set the cipher & initialize */
/* XXX N.B.: DSM plugin had encrypt=1 for both (i.e. perfectly symmetric) */
EVP_CipherInit_ex(ctx, Cipher, NULL, keystr, ivec, encrypt);
}
/* debug output */
PRINT_KEYSTR_AND_FRIENDS;
/* now loop forever processing the data stream */
while (1) {
errno = 0;
if (first && n > 0) {
if (encrypt && msrc4_sc) {
/* skip sending salt+iv */
first = 0;
continue;
}
/* use that first block of data placed in buf above */
} else {
/* general case of loop, read some in: */
n = read(sock_fr, buf, BSIZE);
}
/* debug output: */
if (vb) fprintf(stderr, "%s%d/%d ", encrypt ? "+" : "-", n, errno);
if (n <= 0) {} else if (encrypt) {ENC_PT_DBG(buf, n);} else {DEC_CT_DBG(buf, n);}
if (n == 0 || (n < 0 && errno != EINTR)) {
/* failure to read any data... it is EOF or fatal error. */
/* debug output: */
char tmp[32]; int err = errno;
if (encrypt) {ENC_PT_DBG("--EOF--", 7);} else {DEC_CT_DBG("--EOF--", 7);}
sprintf(tmp, "err=%d,n=%d", err, n);
fprintf(stderr, "%s: %s - input stream finished: n=%d, err=%d", prog, encstr, n, err);
if (encrypt) {ENC_PT_DBG(tmp, strlen(tmp));} else {DEC_CT_DBG(tmp, strlen(tmp));}
/* EOF or fatal error */
break;
} else if (n > 0) {
/* we read in some data, now transform it: */
if (first && encrypt) {
/* first time, copy the salt and ivec to out[] for sending */
memcpy(out, buf, n);
cnt = n;
} else if (!EVP_CipherUpdate(ctx, out, &cnt, buf, n)) {
/* otherwise, we transform the data */
fprintf(stderr, "%s: enc_xfer EVP_CipherUpdate failed.\n", prog);
break;
}
/* debug output: */
if (vb) fprintf(stderr, "c%d/%d ", cnt, n);
if (encrypt) {ENC_CT_DBG(out, cnt);} else {DEC_PT_DBG(out, cnt);}
/* write transformed data to the other end: */
len = cnt;
psrc = out;
while (len > 0) {
errno = 0;
m = write(sock_to, psrc, len);
/* debug output: */
if (vb) fprintf(stderr, "m%s%d/%d ", encrypt ? "+" : "-", m, errno);
if (m > 0) {
/* scoot them by how much was written: */
psrc += m;
len -= m;
}
if (m < 0 && (errno == EINTR || errno == EAGAIN)) {
/* interrupted or blocked */
continue;
}
/* EOF or fatal error */
break;
}
} else {
/* this is EINTR */
}
first = 0;
}
/* transfer done (viewer exited or some error) */
finished:
fprintf(stderr, "\n%s: %s - close sock_to\n", prog, encstr);
close(sock_to);
fprintf(stderr, "%s: %s - close sock_fr\n", prog, encstr);
close(sock_fr);
/* kill our partner after 2 secs. */
sleep(2);
if (child) {
if (kill(child, SIGTERM) == 0) {
fprintf(stderr, "%s[%d]: %s - killed my partner: %d\n",
prog, (int) getpid(), encstr, (int) child);
}
} else {
if (kill(parent, SIGTERM) == 0) {
fprintf(stderr, "%s[%d]: %s - killed my partner: %d\n",
prog, (int) getpid(), encstr, (int) parent);
}
}
}
/*
* Listens on incoming port for a client, then connects to remote server.
* Then forks into two processes one is the encrypter the other the
* decrypter.
*/
static void enc_connections(int listen_port, char *connect_host, int connect_port) {
int listen_fd, conn1, conn2, ret, n, one = 1;
socklen_t clen;
struct hostent *hp;
struct sockaddr_in client, server;
/* zero means use stdio (preferably from socketpair()) */
if (listen_port == 0) {
conn1 = fileno(stdin);
goto use_stdio;
}
/* fd=n,m means use the supplied already established sockets */
if (sscanf(connect_host, "fd=%d,%d", &conn1, &conn2) == 2) {
goto use_input_fds;
}
/* create the listening socket: */
memset(&client, 0, sizeof(client));
client.sin_family = AF_INET;
if (listen_port < 0) {
/* negative port means use loopback */
client.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
client.sin_port = htons(-listen_port);
} else {
client.sin_addr.s_addr = htonl(INADDR_ANY);
client.sin_port = htons(listen_port);
}
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0) {
perror("socket");
exit(1);
}
ret = setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
if (ret < 0) {
perror("setsockopt");
exit(1);
}
ret = bind(listen_fd, (struct sockaddr *) &client, sizeof(client));
if (ret < 0) {
perror("bind");
exit(1);
}
ret = listen(listen_fd, 2);
if (ret < 0) {
perror("listen");
exit(1);
}
fprintf(stderr, "%s: waiting for connection on port: %d\n", prog, listen_port);
/* wait for a connection: */
clen = sizeof(client);
conn1 = accept(listen_fd, (struct sockaddr *) &client, &clen);
if (conn1 < 0) {
perror("accept");
exit(1);
}
/* done with the listening socket: */
close(listen_fd);
use_stdio:
fprintf(stderr, "%s: got connection: %d\n", prog, conn1);
/* now connect to remote server: */
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(connect_port);
if ((server.sin_addr.s_addr = inet_addr(connect_host)) == htonl(INADDR_NONE)) {
if (!(hp = gethostbyname(connect_host))) {
perror("gethostbyname");
close(conn1);
exit(1);
}
server.sin_addr.s_addr = *(unsigned long *)hp->h_addr;
}
conn2 = socket(AF_INET, SOCK_STREAM, 0);
if (conn2 < 0) {
perror("socket");
close(conn1);
exit(1);
}
if (connect(conn2, (struct sockaddr *)&server, (sizeof(server))) < 0) {
perror("connect");
close(conn1);
exit(1);
}
use_input_fds:
/* fork into two processes; one for each direction: */
parent = getpid();
child = fork();
if (child == (pid_t) -1) {
/* couldn't fork... */
perror("fork");
exit(1);
}
/* Do transfer/encode/decode loop: */
if (child == 0) {
/* encrypter: local-viewer -> remote-server */
enc_xfer(conn1, conn2, 1);
} else {
/* decrypter: remote-server -> local-viewer */
enc_xfer(conn2, conn1, 0);
}
}
#endif /* ENC_HAVE_OPENSSL */
extern int main (int argc, char *argv[]) {
char *kf, *q;
if (argc < 4) {
fprintf(stderr, "%s\n", usage);
exit(1);
}
/* guard against pw= on cmdline (e.g. linux) */
kf = strdup(argv[2]);
q = strstr(argv[2], "pw=");
if (q) {
while (*q != '\0') {
*q = '\0';
q++;
}
}
enc_do(argv[1], kf, argv[3], argv[4]);
return 0;
}
/*
* a crude utility to have this work "keyless" i.e. the vnc password
* is used instead of a pre-shared key file.
*/
/*
#!/usr/bin/perl
#
# md5_to_rc4key.pl
#
# This program requires md5sum(1) installed on your machine.
#
# It translates a VNC password to a ultravnc dsm plugin
# compatible key file.
#
# Supply VNC password on cmdline, capture in key file:
#
# md5_to_rc4key.pl swordfish > rc4.key
# md5_to_rc4key.pl -a swordfish > arc4.key
#
# Use rc4.key with ultravnc_dsm_helper in msrc4 mode,
# or arc4.key in either arc4 or aesv4 mode.
#
#
$rfmt = 1;
if ($ARGV[0] eq '-a') {
$rfmt = 0;
shift;
}
# n.b. this is not super secure against bad locals...
$pw = shift;
$tmp = "/tmp/md5out.$$";
open(MD5, "| md5sum > $tmp");
print MD5 $pw;
close MD5;
$md5 = `cat $tmp`;
unlink $tmp;
($md5, $junk) = split(/\s/, $md5);
print "128 bit" if $rfmt;
print 'a' x 4 if $rfmt;
print 'b' x 12 if $rfmt;
$str = '';
foreach $d (split(//, $md5)) {
$str .= $d;
if (length($str) == 2) {
push @key, $str;
$str = '';
}
}
@key = (reverse @key) if $rfmt;
foreach $h (@key) {
$c = pack('c', hex("0x$h"));
print $c;
}
print 'c' x 48 if $rfmt;
*/
#endif /* _X11VNC_ENC_H */
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