[tor-commits] [orbot/master] Modified iptables rules for transproxying. UDP is now blocked. Also removed some redundant rules and reordered others. I reordered by the idea that its generally easier to specifically allow traffic before your reject it.
n8fr8 at torproject.org
n8fr8 at torproject.org
Mon Oct 1 07:41:26 UTC 2012
commit c2f3f77053a3e3064f21e7b3d6210f3398cb52d1
Author: patch <patrickbx at gmail.com>
Date: Mon Jul 23 16:12:55 2012 -0400
Modified iptables rules for transproxying. UDP is now blocked. Also removed some redundant rules and reordered others. I reordered by the idea that its generally easier to specifically allow traffic before your reject it.
Signed-off-by: n8fr8 <nathan at freitas.net>
---
.../torproject/android/service/TorTransProxy.java | 133 ++++++++++----------
1 files changed, 64 insertions(+), 69 deletions(-)
diff --git a/src/org/torproject/android/service/TorTransProxy.java b/src/org/torproject/android/service/TorTransProxy.java
index 2571123..c248a9f 100644
--- a/src/org/torproject/android/service/TorTransProxy.java
+++ b/src/org/torproject/android/service/TorTransProxy.java
@@ -224,6 +224,15 @@ public class TorTransProxy implements TorServiceConstants {
int torUid = context.getApplicationInfo().uid;
+ // Allow everything for Tor
+ script.append(ipTablesPath);
+ script.append(" -t filter");
+ script.append(" -A OUTPUT");
+ script.append(" -m owner --uid-owner ");
+ script.append(torUid);
+ script.append(" -j ACCEPT");
+ script.append(" || exit\n");
+
//build up array of shell cmds to execute under one root context
for (TorifiedApp tApp:apps)
{
@@ -235,9 +244,9 @@ public class TorTransProxy implements TorServiceConstants {
{
TorService.logMessage("enabling transproxy for app: " + tApp.getUsername() + "(" + tApp.getUid() + ")");
-
- // Set up port redirection
- script.append(ipTablesPath);
+
+ // Set up port redirection
+ script.append(ipTablesPath);
script.append(" -t nat");
script.append(" -A OUTPUT -p tcp");
script.append(" ! -d 127.0.0.1"); //allow access to localhost
@@ -251,14 +260,28 @@ public class TorTransProxy implements TorServiceConstants {
// Same for DNS
script.append(ipTablesPath);
script.append(" -t nat");
- script.append(" -A OUTPUT -p udp -m owner --uid-owner ");
+ script.append(" -A OUTPUT -p udp");
+ script.append(" -m owner --uid-owner ");
script.append(tApp.getUid());
script.append(" -m udp --dport ");
script.append(STANDARD_DNS_PORT);
script.append(" -j REDIRECT --to-ports ");
script.append(TOR_DNS_PORT);
script.append(" || exit\n");
-
+
+ // Allow loopback
+ script.append(ipTablesPath);
+ script.append(" -t filter");
+ script.append(" -A OUTPUT");
+ script.append(" -m owner --uid-owner ");
+ script.append(tApp.getUid());
+ script.append(" -o lo");
+ script.append(" -j ACCEPT");
+ script.append(" || exit\n");
+
+ /*
+ //Outgoing loopback already allowed (23/7/12)
+
int[] ports = {TOR_DNS_PORT,TOR_TRANSPROXY_PORT,PORT_SOCKS,PORT_HTTP};
for (int port : ports)
@@ -276,53 +299,32 @@ public class TorTransProxy implements TorServiceConstants {
script.append(" -j ACCEPT");
script.append(" || exit\n");
}
-
- // Allow loopback
+ */
+
+ // Reject all other outbound TCP packets
script.append(ipTablesPath);
script.append(" -t filter");
script.append(" -A OUTPUT");
script.append(" -m owner --uid-owner ");
script.append(tApp.getUid());
script.append(" -p tcp");
- script.append(" -o lo");
- script.append(" -j ACCEPT");
- script.append(" || exit\n");
-
- // Reject DNS that is not from Tor (order is important - first matched rule counts!)
- script.append(ipTablesPath);
- script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -m owner --uid-owner ");
- script.append(tApp.getUid());
- script.append(" -p udp");
- script.append(" --dport ");
- script.append(STANDARD_DNS_PORT);
script.append(" -j REJECT");
script.append(" || exit\n");
-
- // Reject all other outbound TCP packets
+
+ // Reject all other outbound UDP packets
script.append(ipTablesPath);
script.append(" -t filter");
script.append(" -A OUTPUT");
script.append(" -m owner --uid-owner ");
script.append(tApp.getUid());
- script.append(" -p tcp");
+ script.append(" -p udp");
script.append(" -j REJECT");
script.append(" || exit\n");
+
}
}
-
- // Allow everything for Tor
- script.append(ipTablesPath);
- script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -m owner --uid-owner ");
- script.append(torUid);
- script.append(" -j ACCEPT");
- script.append(" || exit\n");
-
String[] cmdAdd = {script.toString()};
code = TorServiceUtils.doShellCommand(cmdAdd, res, runRoot, waitFor);
@@ -450,8 +452,8 @@ public class TorTransProxy implements TorServiceConstants {
int torUid = context.getApplicationInfo().uid;
- // Set up port redirection
- script.append(ipTablesPath);
+ // Set up port redirection
+ script.append(ipTablesPath);
script.append(" -t nat");
script.append(" -A OUTPUT -p tcp");
script.append(" ! -d 127.0.0.1"); //allow access to localhost
@@ -465,14 +467,36 @@ public class TorTransProxy implements TorServiceConstants {
// Same for DNS
script.append(ipTablesPath);
script.append(" -t nat");
- script.append(" -A OUTPUT -p udp -m owner ! --uid-owner ");
+ script.append(" -A OUTPUT -p udp");
+ script.appent(" -m owner ! --uid-owner ");
script.append(torUid);
script.append(" -m udp --dport ");
script.append(STANDARD_DNS_PORT);
script.append(" -j REDIRECT --to-ports ");
script.append(TOR_DNS_PORT);
script.append(" || exit\n");
+
+ // Allow loopback
+ script.append(ipTablesPath);
+ script.append(" -t filter");
+ script.append(" -A OUTPUT");
+ script.append(" -o lo");
+ script.append(" -j ACCEPT");
+ script.append(" || exit\n");
+ // Allow everything for Tor
+ script.append(ipTablesPath);
+ script.append(" -t filter");
+ script.append(" -A OUTPUT");
+ script.append(" -m owner --uid-owner ");
+ script.append(torUid);
+ script.append(" -j ACCEPT");
+ script.append(" || exit\n");
+
+
+ /*
+ //Outgoing loopback already allowed (23/7/12)
+
int[] ports = {TOR_DNS_PORT,TOR_TRANSPROXY_PORT,PORT_SOCKS,PORT_HTTP};
for (int port : ports)
@@ -490,25 +514,8 @@ public class TorTransProxy implements TorServiceConstants {
script.append(" -j ACCEPT");
script.append(" || exit\n");
- }
-
- // Allow loopback
- script.append(ipTablesPath);
- script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -p tcp");
- script.append(" -o lo");
- script.append(" -j ACCEPT");
- script.append(" || exit\n");
+ } */
- // Allow everything for Tor
- script.append(ipTablesPath);
- script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -m owner --uid-owner ");
- script.append(torUid);
- script.append(" -j ACCEPT");
- script.append(" || exit\n");
if (TorService.ENABLE_DEBUG_LOG)
{
@@ -532,23 +539,11 @@ public class TorTransProxy implements TorServiceConstants {
script.append(" --log-uid");
script.append(" || exit\n");
}
-
- // Reject DNS that is not from Tor (order is important - first matched rule counts!)
- script.append(ipTablesPath);
- script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -p udp");
- script.append(" --dport ");
- script.append(STANDARD_DNS_PORT);
- script.append(" -j REJECT");
- script.append(" || exit\n");
-
- // Reject all other outbound TCP packets
+
+ // Reject all other outbound packets by default
script.append(ipTablesPath);
script.append(" -t filter");
- script.append(" -A OUTPUT");
- script.append(" -p tcp");
- script.append(" -j REJECT");
+ script.append(" -P OUTPUT DROP");
script.append(" || exit\n");
String[] cmdAdd = {script.toString()};
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