Restrict SipProfiles to profiles directory
We now check SIP profile names to ensure that they do not attempt file
traversal when being saved. They are now restricted to be children of
the profiles/ directory.
BUG: 31530456
Change-Id: I9c9bce59d852e8a1cf500be6ca59b5e303877180
(cherry picked from commit 4c761b96c2ee36410603df8e8a4fb4e07c12ede0)
diff --git a/sip/src/com/android/services/telephony/sip/SipEditor.java b/sip/src/com/android/services/telephony/sip/SipEditor.java
index 6304220..8512fe3 100644
--- a/sip/src/com/android/services/telephony/sip/SipEditor.java
+++ b/sip/src/com/android/services/telephony/sip/SipEditor.java
@@ -259,7 +259,7 @@
*
* @param p The {@link SipProfile} to delete.
*/
- private void deleteAndUnregisterProfile(SipProfile p) {
+ private void deleteAndUnregisterProfile(SipProfile p) throws IOException {
if (p == null) return;
mProfileDb.deleteProfile(p);
mSipAccountRegistry.stopSipService(this, p.getProfileName());
diff --git a/sip/src/com/android/services/telephony/sip/SipProfileDb.java b/sip/src/com/android/services/telephony/sip/SipProfileDb.java
index 578c683..5ead30b 100644
--- a/sip/src/com/android/services/telephony/sip/SipProfileDb.java
+++ b/sip/src/com/android/services/telephony/sip/SipProfileDb.java
@@ -21,6 +21,7 @@
import android.content.Context;
import android.net.sip.SipProfile;
import android.text.TextUtils;
+import android.util.EventLog;
import android.util.Log;
import java.io.File;
@@ -54,9 +55,13 @@
mSipSharedPreferences = new SipSharedPreferences(context);
}
- public void deleteProfile(SipProfile p) {
+ public void deleteProfile(SipProfile p) throws IOException {
synchronized(SipProfileDb.class) {
- deleteProfile(new File(mProfilesDirectory + p.getProfileName()));
+ File profileFile = new File(mProfilesDirectory, p.getProfileName());
+ if (!isChild(new File(mProfilesDirectory), profileFile)) {
+ throw new IOException("Invalid Profile Credentials!");
+ }
+ deleteProfile(profileFile);
if (mProfilesCount < 0) retrieveSipProfileListInternal();
mSipSharedPreferences.setProfilesCount(--mProfilesCount);
}
@@ -72,7 +77,10 @@
public void saveProfile(SipProfile p) throws IOException {
synchronized(SipProfileDb.class) {
if (mProfilesCount < 0) retrieveSipProfileListInternal();
- File f = new File(mProfilesDirectory + p.getProfileName());
+ File f = new File(mProfilesDirectory, p.getProfileName());
+ if (!isChild(new File(mProfilesDirectory), f)) {
+ throw new IOException("Invalid Profile Credentials!");
+ }
if (!f.exists()) f.mkdirs();
AtomicFile atomicFile = new AtomicFile(new File(f, PROFILE_OBJ_FILE));
FileOutputStream fos = null;
@@ -158,4 +166,19 @@
private static void log(String msg) {
Log.d(SipUtil.LOG_TAG, PREFIX + msg);
}
+
+ /**
+ * Verifies that the file is a direct child of the base directory.
+ */
+ private boolean isChild(File base, File file) {
+ if (base == null || file == null) {
+ return false;
+ }
+ if (!base.equals(file.getAbsoluteFile().getParentFile())) {
+ Log.w(SipUtil.LOG_TAG, "isChild, file is not a child of the base dir.");
+ EventLog.writeEvent(0x534e4554, "31530456", -1, "");
+ return false;
+ }
+ return true;
+ }
}
