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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2010 Antoine Martin. All Rights Reserved.
* Copyright (C) 2010 D. R. Commander. All Rights Reserved.
* Copyright 2018-2023 Pierre Ossman for Cendio AB
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <os/os.h>
#include <rfb/obfuscate.h>
#include <termios.h>
using namespace rfb;
char* prog;
static void usage()
{
fprintf(stderr,"usage: %s [file]\n", prog);
fprintf(stderr," %s -f\n", prog);
exit(1);
}
static void enableEcho(bool enable) {
termios attrs;
tcgetattr(fileno(stdin), &attrs);
if (enable)
attrs.c_lflag |= ECHO;
else
attrs.c_lflag &= ~ECHO;
attrs.c_lflag |= ECHONL;
tcsetattr(fileno(stdin), TCSAFLUSH, &attrs);
}
static const char* getpassword(const char* prompt) {
static char buf[256];
if (prompt) fputs(prompt, stdout);
enableEcho(false);
char* result = fgets(buf, 256, stdin);
enableEcho(true);
if (result) {
if (result[strlen(result)-1] == '\n')
result[strlen(result)-1] = 0;
return buf;
}
return 0;
}
// Reads passwords from stdin and prints encrypted passwords to stdout.
static int encrypt_pipe() {
int i;
// We support a maximum of two passwords right now
for (i = 0;i < 2;i++) {
const char *result = getpassword(NULL);
if (!result)
break;
std::vector<uint8_t> obfuscated = obfuscate(result);
if (fwrite(obfuscated.data(), obfuscated.size(), 1, stdout) != 1) {
fprintf(stderr,"Writing to stdout failed\n");
return 1;
}
}
// Did we fail to produce even one password?
if (i == 0)
return 1;
return 0;
}
static std::vector<uint8_t> readpassword() {
while (true) {
const char *passwd = getpassword("Password:");
if (passwd == NULL) {
perror("getpassword error");
exit(1);
}
std::string first = passwd;
if (first.size() < 6) {
if (first.empty()) {
fprintf(stderr,"Password not changed\n");
exit(1);
}
fprintf(stderr,"Password must be at least 6 characters - try again\n");
continue;
}
passwd = getpassword("Verify:");
if (passwd == NULL) {
perror("getpass error");
exit(1);
}
std::string second = passwd;
if (first != second) {
fprintf(stderr,"Passwords don't match - try again\n");
continue;
}
return obfuscate(first.c_str());
}
}
int main(int argc, char** argv)
{
prog = argv[0];
char fname[PATH_MAX];
fname[0] = '\0';
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "-q") == 0) { // allowed for backwards compatibility
} else if (strncmp(argv[i], "-f", 2) == 0) {
return encrypt_pipe();
} else if (argv[i][0] == '-') {
usage();
} else if (fname[0] == '\0') {
if (strlen(argv[i]) >= sizeof(fname)) {
fprintf(stderr, "Too long filename specified\n");
return -1;
}
strcpy(fname, argv[i]);
} else {
usage();
}
}
if (fname[0] == '\0') {
const char *homeDir = os::getvnchomedir();
if (homeDir == NULL) {
fprintf(stderr, "Can't obtain VNC home directory\n");
exit(1);
}
mkdir(homeDir, 0777);
snprintf(fname, sizeof(fname), "%s/passwd", homeDir);
}
while (true) {
std::vector<uint8_t> obfuscated = readpassword();
std::vector<uint8_t> obfuscatedReadOnly;
fprintf(stderr, "Would you like to enter a view-only password (y/n)? ");
char yesno[3];
if (fgets(yesno, 3, stdin) != NULL && (yesno[0] == 'y' || yesno[0] == 'Y')) {
obfuscatedReadOnly = readpassword();
} else {
fprintf(stderr, "A view-only password is not used\n");
}
FILE* fp = fopen(fname,"w");
if (!fp) {
fprintf(stderr,"Couldn't open %s for writing\n",fname);
exit(1);
}
chmod(fname, S_IRUSR|S_IWUSR);
if (fwrite(obfuscated.data(), obfuscated.size(), 1, fp) != 1) {
fprintf(stderr,"Writing to %s failed\n",fname);
exit(1);
}
if (!obfuscatedReadOnly.empty()) {
if (fwrite(obfuscatedReadOnly.data(), obfuscatedReadOnly.size(), 1, fp) != 1) {
fprintf(stderr,"Writing to %s failed\n",fname);
exit(1);
}
}
fclose(fp);
return 0;
}
}
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