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Use ProcessBuilder to construct program calls

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Avoid potential remote code execution through the `parameters`
parameter. They were concatenated to the capture command String
directly, which could lead to the injection of malicious code.

Currently the problem isn't exposed because the potential attacker
can't control the contents of the `parameters` map, since their
contents are chosen from a limited set of values.
This commit is contained in:
Oscar Gonzalez Fernandez 2013-06-05 16:39:55 +02:00
parent 48b29cc6aa
commit 9576e135ad
1 changed files with 36 additions and 35 deletions
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69
libreplan-webapp/src/main/java/org/libreplan/web/print/CutyPrint.java
View file

@ -145,9 +145,7 @@ public class CutyPrint {
+ new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())
+ extension;
// Generate capture string
String captureString = CUTYCAPT_COMMAND;
String url = CallbackServlet.registerAndCreateURLFor(request,
String capturePath = CallbackServlet.registerAndCreateURLFor(request,
executeOnOriginalContext(new IServletRequestHandler() {
@Override
@ -164,34 +162,26 @@ public class CutyPrint {
}
}));
// Add capture destination callback URL
String hostName = resolveLocalHost(request);
captureString += " --url="+ request.getScheme() + "://" + hostName + ":"
+ request.getLocalPort() + url;
if (parameters != null) {
captureString += "?";
for (String key : parameters.keySet()) {
captureString += key + "=" + parameters.get(key) + "&";
}
captureString = captureString.substring(0,
(captureString.length() - 1));
}
ProcessBuilder capture = new ProcessBuilder(CUTYCAPT_COMMAND);
capture.command().add(
" --url=" + createCaptureURL(request, parameters, capturePath));
boolean expanded = Planner
.guessContainersExpandedByDefaultGivenPrintParameters(parameters);
int minWidthForTaskNameColumn = planner
.calculateMinimumWidthForTaskNameColumn(expanded);
int plannerWidth = calculatePlannerWidthForPrintingScreen(planner,
minWidthForTaskNameColumn);
captureString += " --min-width=" + plannerWidth;
capture.command().add(" --min-width=" + plannerWidth);
int plannerHeight = (expanded ? planner.getAllTasksNumber() : planner
.getTaskNumber()) * TASK_HEIGHT + PRINT_VERTICAL_SPACING;
captureString += " --min-height=" + plannerHeight;
capture.command().add(" --min-height=" + plannerHeight);
// Static width and time delay parameters (FIX)
captureString += " --delay=" + CAPTURE_DELAY;
capture.command().add(" --delay=" + CAPTURE_DELAY);
String generatedCSSFile = createCSSFile(
absolutePath + "/planner/css/print.css",
@ -203,18 +193,18 @@ public class CutyPrint {
minWidthForTaskNameColumn);
// Relative user styles
captureString += " --user-style-path=" + generatedCSSFile;
capture.command().add(" --user-style-path=" + generatedCSSFile);
// Destination complete absolute path
captureString += " --out=" + absolutePath + filename;
capture.command().add(" --out=" + absolutePath + filename);
// User language
captureString += " --header=Accept-Language:"
+ Locales.getCurrent().getLanguage();
capture.command().add(
" --header=Accept-Language:"
+ Locales.getCurrent().getLanguage());
try {
// CutyCapt command execution
LOG.warn(captureString);
LOG.info("calling " + capture.command());
Process printProcess;
Process serverProcess = null;
@ -222,21 +212,15 @@ public class CutyPrint {
// If there is a not real X server environment then use Xvfb
if ((System.getenv("DISPLAY") == null)
|| (System.getenv("DISPLAY").equals(""))) {
String[] serverEnvironment = { "PATH=$PATH" };
serverProcess = Runtime.getRuntime().exec("env - Xvfb :99",
serverEnvironment);
String[] environment = { "DISPLAY=:99.0" };
printProcess = Runtime.getRuntime().exec(captureString,
environment);
} else {
printProcess = Runtime.getRuntime().exec(captureString);
serverProcess = new ProcessBuilder("Xvfb", ":99").start();
capture.environment().put("DISPLAY", ":99.0");
}
printProcess = capture.start();
try {
printProcess.waitFor();
printProcess.destroy();
if ((System.getenv("DISPLAY") == null)
|| (System.getenv("DISPLAY").equals(""))) {
if (serverProcess != null) {
serverProcess.destroy();
}
Executions.getCurrent().sendRedirect(filename, "_blank");
@ -249,6 +233,23 @@ public class CutyPrint {
}
}
private static String createCaptureURL(HttpServletRequest request,
Map<String, String> parameters, String capturePath) {
// Add capture destination callback URL
String hostName = resolveLocalHost(request);
String result = request.getScheme() + "://" + hostName
+ ":" + request.getLocalPort() + capturePath;
if (parameters != null) {
result += "?";
for (String key : parameters.keySet()) {
result += key + "=" + parameters.get(key) + "&";
}
result = result.substring(0,
(result.length() - 1));
}
return result;
}
private static String resolveLocalHost(HttpServletRequest request) {
try {
InetAddress host = InetAddress.getByName(request.getLocalName());