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[tor-commits] [tor-launcher/master] Bug 29627: Moat: add support for obfsproxy's meek_lite
commit 99035eb7b6069c60fe4f97291abbea5af4fee886
Author: Kathy Brade <brade@xxxxxxxxxxxxxxxxx>
Date: Fri Mar 1 10:09:16 2019 -0500
Bug 29627: Moat: add support for obfsproxy's meek_lite
Recognize "meek_lite" as a transport in addition to "meek".
Use SOCKS args instead of command line parameters to pass the
"url" (BridgeDB reflector) and "front" (BridgeDB front end)
parameters to the PT binary.
---
src/chrome/content/network-settings.js | 18 ++++---
src/modules/tl-bridgedb.jsm | 96 ++++++++++++++++++++++++++++------
2 files changed, 91 insertions(+), 23 deletions(-)
diff --git a/src/chrome/content/network-settings.js b/src/chrome/content/network-settings.js
index 1599c28..fad89e5 100644
--- a/src/chrome/content/network-settings.js
+++ b/src/chrome/content/network-settings.js
@@ -1,4 +1,4 @@
-// Copyright (c) 2018, The Tor Project, Inc.
+// Copyright (c) 2019, The Tor Project, Inc.
// See LICENSE for licensing information.
//
// vim: set sw=2 sts=2 ts=8 et syntax=javascript:
@@ -542,18 +542,22 @@ function onOpenBridgeDBRequestPrompt()
return;
let meekClientPath;
+ let meekTransport; // We support both "meek" and "meek_lite".
let meekClientArgs;
reply.lineArray.forEach(aLine =>
{
let tokens = aLine.split(' ');
- if ((tokens.length > 2) && (tokens[0] == "meek") && (tokens[1] == "exec"))
+ if ((tokens.length > 2) &&
+ ((tokens[0] == "meek") || (tokens[0] == "meek_lite")) &&
+ (tokens[1] == "exec"))
{
+ meekTransport = tokens[0];
meekClientPath = tokens[2];
meekClientArgs = tokens.slice(3);
}
});
- if (!meekClientPath)
+ if (!meekTransport)
{
reportMoatError(TorLauncherUtil.getLocalizedString("no_meek"));
return;
@@ -578,7 +582,8 @@ function onOpenBridgeDBRequestPrompt()
resetBridgeDBRequestPrompt();
setBridgeDBRequestState("fetchingCaptcha");
overlay.hidden = false;
- requestMoatCaptcha(proxySettings, meekClientPath, meekClientArgs);
+ requestMoatCaptcha(proxySettings, meekTransport, meekClientPath,
+ meekClientArgs);
}
}
@@ -2508,7 +2513,8 @@ function createColonStr(aStr1, aStr2)
}
-function requestMoatCaptcha(aProxySettings, aMeekClientPath, aMeekClientArgs)
+function requestMoatCaptcha(aProxySettings, aMeekTransport,
+ aMeekClientPath, aMeekClientArgs)
{
function cleanup(aMoatRequestor, aErr)
{
@@ -2543,7 +2549,7 @@ function requestMoatCaptcha(aProxySettings, aMeekClientPath, aMeekClientArgs)
};
addBridgeDBRequestEventListener(kCaptchaCancelEventType, cancelListener);
- moatRequestor.init(proxyURLFromSettings(aProxySettings),
+ moatRequestor.init(proxyURLFromSettings(aProxySettings), aMeekTransport,
aMeekClientPath, aMeekClientArgs)
.then(()=>
{
diff --git a/src/modules/tl-bridgedb.jsm b/src/modules/tl-bridgedb.jsm
index 8b7a1d6..bc9b300 100644
--- a/src/modules/tl-bridgedb.jsm
+++ b/src/modules/tl-bridgedb.jsm
@@ -1,4 +1,4 @@
-// Copyright (c) 2018, The Tor Project, Inc.
+// Copyright (c) 2019, The Tor Project, Inc.
// See LICENSE for licensing information.
//
// vim: set sw=2 sts=2 ts=8 et syntax=javascript:
@@ -61,7 +61,6 @@ function _MoatRequestor()
_MoatRequestor.prototype =
{
kMaxResponseLength: 1024 * 400,
- kTransport: "meek",
kMoatContentType: "application/vnd.api+json",
kMoatVersion: "0.1.0",
kPrefBridgeDBFront: "extensions.torlauncher.bridgedb_front",
@@ -74,6 +73,9 @@ _MoatRequestor.prototype =
kMoatCheckRequestType: "moat-solution",
kMoatCheckResponseType: "moat-bridges",
+ kMozProxyTypeSocks4: "socks4",
+ kMozProxyTypeSocks5: "socks",
+
kStateIdle: 0,
kStateWaitingForVersion: 1,
kStateWaitingForProxyDone: 2,
@@ -83,19 +85,22 @@ _MoatRequestor.prototype =
mState: this.kStateIdle,
+ mMeekTransport: undefined,
mLocalProxyURL: undefined,
mMeekFront: undefined, // Frontend server, if we are using one.
+ mMeekClientEscapedArgs: undefined,
mMeekClientProcess: undefined,
mMeekClientStdoutBuffer: undefined,
- mMeekClientProxyType: undefined, // contains Mozilla names such as socks4
+ mMeekClientProxyType: undefined, // kMozProxyTypeSocks4 or kMozProxyTypeSocks5
mMeekClientIP: undefined,
mMeekClientPort: undefined,
mMoatResponseListener: undefined,
mUserCanceled: false,
// Returns a promise.
- init: function(aProxyURL, aMeekClientPath, aMeekClientArgs)
+ init: function(aProxyURL, aMeekTransport, aMeekClientPath, aMeekClientArgs)
{
+ this.mMeekTransport = aMeekTransport;
this.mLocalProxyURL = aProxyURL;
return this._startMeekClient(aMeekClientPath, aMeekClientArgs);
},
@@ -208,21 +213,24 @@ _MoatRequestor.prototype =
meekClientPath = f.path;
}
- // Construct the args array.
- let args = aMeekClientArgs.slice(); // make a copy
+ // Construct the per-connection arguments.
+ this.mMeekClientEscapedArgs = "";
let meekReflector = TorLauncherUtil.getCharPref(this.kPrefBridgeDBReflector);
if (meekReflector)
{
- args.push("-url");
- args.push(meekReflector);
+ this.mMeekClientEscapedArgs += "url=";
+ this.mMeekClientEscapedArgs += this._escapeArgValue(meekReflector);
}
this.mMeekFront = TorLauncherUtil.getCharPref(this.kPrefBridgeDBFront);
if (this.mMeekFront)
{
- args.push("-front");
- args.push(this.mMeekFront);
+ if (this.mMeekClientEscapedArgs.length > 0)
+ this.mMeekClientEscapedArgs += ';';
+ this.mMeekClientEscapedArgs += "front=";
+ this.mMeekClientEscapedArgs += this._escapeArgValue(this.mMeekFront);
}
+ // Setup environment and start the meek client process.
let ptStateDir = TorLauncherUtil.getTorFile("tordatadir", false);
let meekHelperProfileDir = TorLauncherUtil.getTorFile("pt-profiles-dir",
true);
@@ -238,17 +246,19 @@ _MoatRequestor.prototype =
let envAdditions = { TOR_PT_MANAGED_TRANSPORT_VER: "1",
TOR_PT_STATE_LOCATION: ptStateDir.path,
TOR_PT_EXIT_ON_STDIN_CLOSE: "1",
- TOR_PT_CLIENT_TRANSPORTS: this.kTransport,
+ TOR_PT_CLIENT_TRANSPORTS: this.mMeekTransport,
TOR_BROWSER_MEEK_PROFILE: meekHelperProfileDir.path };
if (this.mLocalProxyURL)
envAdditions.TOR_PT_PROXY = this.mLocalProxyURL;
TorLauncherLogger.log(3, "starting " + meekClientPath + " in "
+ workDir.path);
- TorLauncherLogger.log(3, "args " + JSON.stringify(args));
+ TorLauncherLogger.log(3, "args " + JSON.stringify(aMeekClientArgs));
TorLauncherLogger.log(3, "env additions " + JSON.stringify(envAdditions));
+ TorLauncherLogger.log(3, "per-connection args \"" +
+ this.mMeekClientEscapedArgs + "\"");
let opts = { command: meekClientPath,
- arguments: args,
+ arguments: aMeekClientArgs,
workdir: workDir.path,
environmentAppend: true,
environment: envAdditions,
@@ -271,6 +281,21 @@ _MoatRequestor.prototype =
});
}, // _startMeekClient
+ // Escape aValue per section 3.5 of the PT specification:
+ // First the "<Key>=<Value>" formatted arguments MUST be escaped,
+ // such that all backslash, equal sign, and semicolon characters
+ // are escaped with a backslash.
+ _escapeArgValue: function(aValue)
+ {
+ if (!aValue)
+ return "";
+
+ let rv = aValue.replace(/\\/g, "\\\\");
+ rv = rv.replace(/=/g, "\\=");
+ rv = rv.replace(/;/g, "\\;");
+ return rv;
+ },
+
// Returns a promise that is resolved when the PT handshake finishes.
_meekClientHandshake: function(aMeekClientProc)
{
@@ -389,7 +414,7 @@ _MoatRequestor.prototype =
{
errMsg = "Invalid CMETHOD response (too few parameters).";
}
- else if (tokens[1] != this.kTransport)
+ else if (tokens[1] != this.mMeekTransport)
{
errMsg = "Unexpected transport " + tokens[1]
+ " in CMETHOD response.";
@@ -399,11 +424,11 @@ _MoatRequestor.prototype =
let proxyType = tokens[2];
if (proxyType == "socks5")
{
- this.mMeekClientProxyType = "socks";
+ this.mMeekClientProxyType = this.kMozProxyTypeSocks5;
}
else if ((proxyType == "socks4a") || (proxyType == "socks4"))
{
- this.mMeekClientProxyType = "socks4";
+ this.mMeekClientProxyType = this.kMozProxyTypeSocks4;
}
else
{
@@ -466,12 +491,49 @@ _MoatRequestor.prototype =
// Based on meek/firefox/components/main.js
_sendMoatRequest: function(aRequestObj, aIsCheck)
{
+ // Include arguments per section 3.5 of the PT specification:
+ // Lastly the arguments are transmitted when making the outgoing
+ // connection using the authentication mechanism specific to the
+ // SOCKS protocol version.
+ //
+ // - In the case of SOCKS 4, the concatenated argument list is
+ // transmitted in the "USERID" field of the "CONNECT" request.
+ //
+ // - In the case of SOCKS 5, the parent process must negotiate
+ // "Username/Password" authentication [RFC1929], and transmit
+ // the arguments encoded in the "UNAME" and "PASSWD" fields.
+ //
+ // If the encoded argument list is less than 255 bytes in
+ // length, the "PLEN" field must be set to "1" and the "PASSWD"
+ // field must contain a single NUL character.
+
+ let userName = "";
+ let password = undefined;
+ if (this.mMeekClientProxyType == this.kMozProxyTypeSocks4)
+ {
+ userName = this.mMeekClientEscapedArgs;
+ }
+ else
+ {
+ if (this.mMeekClientEscapedArgs.length <= 255)
+ {
+ userName = this.mMeekClientEscapedArgs;
+ password = "\x00";
+ }
+ else
+ {
+ userName = this.mMeekClientEscapedArgs.substring(0, 255);
+ password = this.mMeekClientEscapedArgs.substring(255);
+ }
+ }
+
let proxyPS = Cc["@mozilla.org/network/protocol-proxy-service;1"]
.getService(Ci.nsIProtocolProxyService);
let flags = Ci.nsIProxyInfo.TRANSPARENT_PROXY_RESOLVES_HOST;
let noTimeout = 0xFFFFFFFF; // UINT32_MAX
- let proxyInfo = proxyPS.newProxyInfo(this.mMeekClientProxyType,
+ let proxyInfo = proxyPS.newProxyInfoWithAuth(this.mMeekClientProxyType,
this.mMeekClientIP, this.mMeekClientPort,
+ userName, password,
flags, noTimeout, undefined);
let uriStr = TorLauncherUtil.getCharPref(this.kPrefMoatService);
if (!uriStr)
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