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[tor-commits] [torbrowser/maint-2.2] Add patch for #5741.



commit acaa131ffbc78c4355e49b7476941a1ad2c9da51
Author: Mike Perry <mikeperry-git@xxxxxxxxxx>
Date:   Wed May 2 17:57:33 2012 -0700

    Add patch for #5741.
---
 .../firefox/0018-Prevent-WebSocket-DNS-leak.patch  |  132 ++++++++++++++++++++
 1 files changed, 132 insertions(+), 0 deletions(-)

diff --git a/src/current-patches/firefox/0018-Prevent-WebSocket-DNS-leak.patch b/src/current-patches/firefox/0018-Prevent-WebSocket-DNS-leak.patch
new file mode 100644
index 0000000..9b30987
--- /dev/null
+++ b/src/current-patches/firefox/0018-Prevent-WebSocket-DNS-leak.patch
@@ -0,0 +1,132 @@
+From 93199734c06485660fb922c61f740191648a6dc6 Mon Sep 17 00:00:00 2001
+From: Mike Perry <mikeperry-git@xxxxxxxxxxxxxx>
+Date: Wed, 2 May 2012 17:44:39 -0700
+Subject: [PATCH 18/18] Prevent WebSocket DNS leak.
+
+This is due to an improper implementation of the WebSocket spec by Mozilla.
+
+"There MUST be no more than one connection in a CONNECTING state.  If multiple
+connections to the same IP address are attempted simultaneously, the client
+MUST serialize them so that there is no more than one connection at a time
+running through the following steps.
+
+If the client cannot determine the IP address of the remote host (for
+example, because all communication is being done through a proxy server that
+performs DNS queries itself), then the client MUST assume for the purposes of
+this step that each host name refers to a distinct remote host,"
+
+https://tools.ietf.org/html/rfc6455#page-15
+
+They implmented the first paragraph, but not the second...
+
+While we're at it, we also prevent the DNS service from being used to look up
+anything other than IP addresses if socks_remote_dns is set to true, so this
+bug can't turn up in other components or due to 3rd party addons.
+---
+ netwerk/dns/nsDNSService2.cpp                   |   24 ++++++++++++++++++++++-
+ netwerk/dns/nsDNSService2.h                     |    1 +
+ netwerk/protocol/websocket/WebSocketChannel.cpp |    8 +++++-
+ 3 files changed, 30 insertions(+), 3 deletions(-)
+
+diff --git a/netwerk/dns/nsDNSService2.cpp b/netwerk/dns/nsDNSService2.cpp
+index 1bd5f38..eda0e48 100644
+--- a/netwerk/dns/nsDNSService2.cpp
++++ b/netwerk/dns/nsDNSService2.cpp
+@@ -404,6 +404,7 @@ nsDNSService::Init()
+     bool     enableIDN        = true;
+     bool     disableIPv6      = false;
+     bool     disablePrefetch  = false;
++    bool     disableDNS       = false;
+     int      proxyType        = nsIProtocolProxyService::PROXYCONFIG_DIRECT;
+     
+     nsAdoptingCString ipv4OnlyDomains;
+@@ -427,6 +428,10 @@ nsDNSService::Init()
+ 
+         // If a manual proxy is in use, disable prefetch implicitly
+         prefs->GetIntPref("network.proxy.type", &proxyType);
++
++        // If the user wants remote DNS, we should fail any lookups that still
++        // make it here.
++        prefs->GetBoolPref("network.proxy.socks_remote_dns", &disableDNS);
+     }
+ 
+     if (mFirstTime) {
+@@ -444,7 +449,7 @@ nsDNSService::Init()
+ 
+             // Monitor these to see if there is a change in proxy configuration
+             // If a manual proxy is in use, disable prefetch implicitly
+-            prefs->AddObserver("network.proxy.type", this, false);
++            prefs->AddObserver("network.proxy.", this, false);
+         }
+     }
+ 
+@@ -473,6 +478,7 @@ nsDNSService::Init()
+         mIDN = idn;
+         mIPv4OnlyDomains = ipv4OnlyDomains; // exchanges buffer ownership
+         mDisableIPv6 = disableIPv6;
++        mDisableDNS = disableDNS;
+ 
+         // Disable prefetching either by explicit preference or if a manual proxy is configured 
+         mDisablePrefetch = disablePrefetch || (proxyType == nsIProtocolProxyService::PROXYCONFIG_MANUAL);
+@@ -584,6 +590,14 @@ nsDNSService::AsyncResolve(const nsACString  &hostname,
+         if (mDisablePrefetch && (flags & RESOLVE_SPECULATE))
+             return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
+ 
++        PRNetAddr tempAddr;
++        if (mDisableDNS) {
++            // Allow IP lookups through, but nothing else.
++            if (PR_StringToNetAddr(hostname.BeginReading(), &tempAddr) != PR_SUCCESS) {
++                return NS_ERROR_UNKNOWN_PROXY_HOST; // XXX: NS_ERROR_NOT_IMPLEMENTED?
++            }
++        }
++
+         res = mResolver;
+         idn = mIDN;
+     }
+@@ -670,6 +684,14 @@ nsDNSService::Resolve(const nsACString &hostname,
+         MutexAutoLock lock(mLock);
+         res = mResolver;
+         idn = mIDN;
++
++        PRNetAddr tempAddr;
++        if (mDisableDNS) {
++            // Allow IP lookups through, but nothing else.
++            if (PR_StringToNetAddr(hostname.BeginReading(), &tempAddr) != PR_SUCCESS) {
++                return NS_ERROR_UNKNOWN_PROXY_HOST; // XXX: NS_ERROR_NOT_IMPLEMENTED?
++            }
++        }
+     }
+     NS_ENSURE_TRUE(res, NS_ERROR_OFFLINE);
+ 
+diff --git a/netwerk/dns/nsDNSService2.h b/netwerk/dns/nsDNSService2.h
+index 1749b41..3ec8eba 100644
+--- a/netwerk/dns/nsDNSService2.h
++++ b/netwerk/dns/nsDNSService2.h
+@@ -70,4 +70,5 @@ private:
+     bool                      mDisableIPv6;
+     bool                      mDisablePrefetch;
+     bool                      mFirstTime;
++    bool                      mDisableDNS;
+ };
+diff --git a/netwerk/protocol/websocket/WebSocketChannel.cpp b/netwerk/protocol/websocket/WebSocketChannel.cpp
+index 22873d3..0875c12 100644
+--- a/netwerk/protocol/websocket/WebSocketChannel.cpp
++++ b/netwerk/protocol/websocket/WebSocketChannel.cpp
+@@ -1875,8 +1875,12 @@ WebSocketChannel::ApplyForAdmission()
+   LOG(("WebSocketChannel::ApplyForAdmission: checking for concurrent open\n"));
+   nsCOMPtr<nsIThread> mainThread;
+   NS_GetMainThread(getter_AddRefs(mainThread));
+-  dns->AsyncResolve(hostName, 0, this, mainThread, getter_AddRefs(mDNSRequest));
+-  NS_ENSURE_SUCCESS(rv, rv);
++  rv = dns->AsyncResolve(hostName, 0, this, mainThread, getter_AddRefs(mDNSRequest));
++  if (NS_FAILED(rv)) {
++      // Fall back to hostname on dispatch failure
++      mDNSRequest = nsnull;
++      OnLookupComplete(nsnull, nsnull, rv);
++  }
+ 
+   return NS_OK;
+ }
+-- 
+1.7.5.4
+

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