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/*
This file is part of the TDE project
Copyright (C) 2011 - 2015 Timothy Pearson <kb9vqf@pearsoncomputing.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <tqstringlist.h>
#include "dmctl.h"
#include "tdmtsak.h"
#define FIFO_FILE "/tmp/tdesocket-global/tsak"
TQString exec(const char * cmd) {
FILE* pipe = popen(cmd, "r");
if (!pipe) return "ERROR";
char buffer[128];
TQString result = "";
while(!feof(pipe)) {
if(fgets(buffer, 128, pipe) != NULL)
result += buffer;
}
pclose(pipe);
return result;
}
bool is_vt_local() {
const char * currentDisplay;
currentDisplay = getenv ("DISPLAY");
if (currentDisplay == NULL) {
return false;
}
else {
DM dm;
SessList sess;
if (dm.localSessions(sess)) {
TQString user, loc;
for (SessList::ConstIterator it = sess.begin(); it != sess.end(); ++it) {
DM::sess2Str2(*it, user, loc);
TQStringList sessionInfoList = TQStringList::split(',', loc, true);
if ((*(sessionInfoList.at(0))).startsWith(":")) {
if (TQString(currentDisplay).startsWith(*(sessionInfoList.at(0)))) {
return true;
}
}
}
}
// Not local
return false;
}
}
bool is_vt_active() {
const char * currentDisplay;
currentDisplay = getenv ("DISPLAY");
if (currentDisplay == NULL) {
return true;
}
else {
DM dm;
SessList sess;
TQString cvtName = "";
TQString curConsole;
int curConsoleNum = dm.activeVT();
if (curConsoleNum < 0) {
return true;
}
curConsole = TQString("vt%1").arg(curConsoleNum);
if (dm.localSessions(sess)) {
TQString user, loc;
for (SessList::ConstIterator it = sess.begin(); it != sess.end(); ++it) {
DM::sess2Str2(*it, user, loc);
TQStringList sessionInfoList = TQStringList::split(',', loc, true);
if ((*(sessionInfoList.at(0))).startsWith(":")) {
if ((*(sessionInfoList.at(1))).stripWhiteSpace() == TQString(curConsole)) {
cvtName = (*(sessionInfoList.at(0)));
}
}
}
if (cvtName != "") {
if (TQString(currentDisplay).startsWith(cvtName)) {
return true;
}
else {
return false;
}
}
else {
// See if the current session is local
// If it is, then the VT is not currently active and the SAK must be requested later when it is active
for (SessList::ConstIterator it = sess.begin(); it != sess.end(); ++it) {
DM::sess2Str2(*it, user, loc);
if ((*it).self) {
TQStringList sessionInfoList = TQStringList::split(',', loc, true);
if ((*(sessionInfoList.at(1))).startsWith(" vt")) {
// Local and inactive
return false;
}
}
}
// Hmm, not local
// Do not reject the SAK
return true;
}
}
else {
// Failure!
// Do not reject the SAK
return true;
}
}
}
int main (int argc, char *argv[])
{
int mPipe_fd;
char readbuf[128];
int numread;
int verifier_result = tde_sak_verify_calling_process();
bool isdm = false;
bool checkonly = false;
if (argc == 2) {
if (strcmp(argv[1], "dm") == 0) {
isdm = true;
}
if (strcmp(argv[1], "check") == 0) {
checkonly = true;
}
}
if (!isdm) {
// Verify that the session is local
// Remote sessions cannot press the SAK for obvious reasons
if (!is_vt_local()) {
return 6; // SAK not available
}
}
if (verifier_result == 0) {
// OK, the calling process is authorized to retrieve SAK data
// First, flush the buffer
mPipe_fd = open(FIFO_FILE, O_RDONLY | O_NONBLOCK);
if (checkonly) {
if (mPipe_fd < 0) {
return 6; // SAK not available
}
else {
return 0;
}
}
numread = 1;
while (numread > 0) {
numread = read(mPipe_fd, readbuf, 6);
}
close(mPipe_fd);
// Now wait for SAK press
while (mPipe_fd > -1) {
mPipe_fd = open(FIFO_FILE, O_RDONLY);
if (mPipe_fd <= -1) {
// This may be a transient glitch, such as when a KVM is being toggled or a new keyboard has been added
// Wait up to 5 seconds while trying to open the pipe again
int timeout = 5;
while ((mPipe_fd <= -1) && (timeout > 0)) {
sleep(1);
mPipe_fd = open(FIFO_FILE, O_RDONLY);
timeout--;
}
}
if (mPipe_fd > -1) {
numread = read(mPipe_fd, readbuf, 6);
readbuf[numread] = 0;
readbuf[127] = 0;
if (strcmp(readbuf, "SAK\n\r") == 0) {
close(mPipe_fd);
if (is_vt_active()) {
return 0;
}
else {
usleep(100);
// Flush the buffer
mPipe_fd = open(FIFO_FILE, O_RDONLY | O_NONBLOCK);
numread = 1;
while (numread > 0) {
numread = read(mPipe_fd, readbuf, 6);
}
close(mPipe_fd);
mPipe_fd = open(FIFO_FILE, O_RDONLY);
}
}
else {
usleep(100);
}
}
close(mPipe_fd);
}
return 6;
}
else {
return verifier_result;
}
}
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