From b81e43465b14836b17e4fe2dea91c78a2bdd29b3 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Sun, 22 Jan 2012 01:02:36 -0600
Subject: Part 2 of prior commit

---
 tdmlib/tdmtsak.h | 144 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 tdmlib/tdmtsak.h

(limited to 'tdmlib/tdmtsak.h')

diff --git a/tdmlib/tdmtsak.h b/tdmlib/tdmtsak.h
new file mode 100644
index 000000000..1987a8218
--- /dev/null
+++ b/tdmlib/tdmtsak.h
@@ -0,0 +1,144 @@
+/*
+   This file is part of the TDE project
+   Copyright (C) 2011 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/select.h>
+#include <sys/time.h>
+#include <termios.h>
+#include <signal.h>
+
+#include <tqstring.h>
+
+#include "config.h"
+
+// #define DEBUG
+
+inline int tde_sak_verify_calling_process()
+{
+	bool authorized = false;
+
+	// Root always has access to everything...
+	if (getuid() == 0) {
+		return 0;
+	}
+
+	pid_t parentproc = getppid();
+#ifdef DEBUG
+	printf("Parent pid is: %d\n\r", parentproc);
+#endif
+
+	char parentexecutable[8192];
+	TQString procparent = TQString("/proc/%1/exe").arg(parentproc);
+	int chars = readlink(procparent.ascii(), parentexecutable, sizeof(parentexecutable));
+	parentexecutable[chars] = 0;
+	parentexecutable[8191] = 0;
+	procparent = parentexecutable;
+#ifdef DEBUG
+	printf("Parent executable name and full path is: %s\n\r", procparent.ascii());
+#endif
+
+	TQString tdeBinaryPath = TQString(KDE_BINDIR "/");
+#ifdef DEBUG
+	printf("The TDE binary path is: %s\n\r", tdeBinaryPath.ascii());
+#endif
+
+	if (!procparent.startsWith(tdeBinaryPath)) {
+		printf("Unauthorized path detected in calling process\n\r");
+		return 2;
+	}
+	else {
+		procparent = procparent.mid(tdeBinaryPath.length());
+#ifdef DEBUG
+		printf("Parent executable name is: %s\n\r", procparent.ascii());
+#endif
+		if ((procparent == "kdesktop") || (procparent == "kdesktop_lock") || (procparent == "tdm")) {
+			authorized = true;
+		}
+		else if (procparent == "tdeinit") {
+			printf("tdeinit detected\n\r");
+			// A bit more digging is needed to see if this is an authorized process or not
+			// Get the tdeinit command
+			char tdeinitcmdline[8192];
+			FILE *fp = fopen(TQString("/proc/%1/cmdline").arg(parentproc).ascii(),"r");
+			if (fp != NULL) {
+				if (fgets (tdeinitcmdline, 8192, fp) != NULL)
+				fclose (fp);
+			}
+			tdeinitcmdline[8191] = 0;
+			TQString tdeinitCommand = tdeinitcmdline;
+
+			// Also get the environment, specifically the path
+			TQString tdeinitEnvironment;
+			char tdeinitenviron[8192];
+			fp = fopen(TQString("/proc/%1/environ").arg(parentproc).ascii(),"r");
+			if (fp != NULL) {
+				int c;
+				int pos = 0;
+				do {
+					c = fgetc(fp);
+					tdeinitenviron[pos] = c;
+					pos++;
+					if (c == 0) {
+						TQString curEnvLine = tdeinitenviron;
+						if (curEnvLine.startsWith("PATH=")) {
+							tdeinitEnvironment = curEnvLine.mid(5);
+						}
+						pos = 0;
+					}
+				} while ((c != EOF) && (pos < 8192));
+				fclose (fp);
+			}
+			tdeinitenviron[8191] = 0;
+
+#ifdef DEBUG
+			printf("Called executable name is: %s\n\r", tdeinitCommand.ascii());
+			printf("Environment is: %s\n\r", tdeinitEnvironment.ascii());
+#endif
+
+			if ((tdeinitCommand == "kdesktop [tdeinit]") && (tdeinitEnvironment.startsWith(KDE_BINDIR))) {
+				authorized = true;
+			}
+			else {
+				return 4;
+			}
+		}
+		else {
+			printf("Unauthorized calling process detected\n\r");
+			return 3;
+		}
+
+		if (authorized == true) {
+			return 0;
+		}
+	}
+
+	return 5;
+}
+
+#undef DEBUG
\ No newline at end of file
-- 
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