Bug 19646: Mac OS: wrong location for meek browser profile

On OSX, use the TOR_BROWSER_TOR_DATA_DIR environment variable value
(if available) to determine the location of the meek browser profile.
This fixes a problem where meek-client-torbrowser attempted to use a
path under /Applications/TorBrowser-Data, to which regular users may
not have write access.

meek-client-torbrowser/linux.go

@@ -11,9 +11,10 @@ import (
 )
 
 const (
-	firefoxPath         = "./firefox"
-	firefoxProfilePath  = "TorBrowser/Data/Browser/profile.meek-http-helper"
-	profileTemplatePath = ""
+	firefoxPath                  = "./firefox"
+	firefoxProfilePath           = "TorBrowser/Data/Browser/profile.meek-http-helper"
+	torDataDirFirefoxProfilePath = ""
+	profileTemplatePath          = ""
 )
 
 func osSpecificCommandSetup(cmd *exec.Cmd) {

meek-client-torbrowser/mac.go

@@ -9,12 +9,17 @@ import "os/exec"
 
 const (
 	// During startup of meek-client-torbrowser, the browser profile is
-	// created and maintained under firefoxProfilePath by making a
-	// recursive copy of everything under profileTemplatePath.
-	// https://bugs.torproject.org/18904
-	firefoxPath         = "../firefox"
-	firefoxProfilePath  = "../../../../TorBrowser-Data/Tor/PluggableTransports/profile.meek-http-helper"
-	profileTemplatePath = "../../Resources/TorBrowser/Tor/PluggableTransports/template-profile.meek-http-helper"
+	// created and maintained under a meek-specific directory by making a
+	// recursive copy of everything under profileTemplatePath (see
+	// https://bugs.torproject.org/18904).
+	// If the TOR_BROWSER_TOR_DATA_DIR env var is set, the path for the
+	// meek-specific profile directory is constructed by appending
+	// torDataDirFirefoxProfilePath to TOR_BROWSER_TOR_DATA_DIR. Otherwise,
+	// firefoxProfilePath (a relative path) is used.
+	firefoxPath                  = "../firefox"
+	torDataDirFirefoxProfilePath = "PluggableTransports/profile.meek-http-helper"
+	firefoxProfilePath           = "../../../../TorBrowser-Data/Tor/PluggableTransports/profile.meek-http-helper"
+	profileTemplatePath          = "../../Resources/TorBrowser/Tor/PluggableTransports/template-profile.meek-http-helper"
 )
 
 func osSpecificCommandSetup(cmd *exec.Cmd) {

meek-client-torbrowser/meek-client-torbrowser.go

@@ -206,9 +206,14 @@ func runFirefox() (cmd *exec.Cmd, stdout io.Reader, err error) {
 		return
 	}
 	var profilePath string
-	profilePath, err = filepath.Abs(firefoxProfilePath)
-	if err != nil {
-		return
+	var torDataDir = os.Getenv("TOR_BROWSER_TOR_DATA_DIR")
+	if torDataDir != "" && torDataDirFirefoxProfilePath != "" {
+		profilePath = filepath.Join(torDataDir, torDataDirFirefoxProfilePath)
+	} else {
+		profilePath, err = filepath.Abs(firefoxProfilePath)
+		if err != nil {
+			return
+		}
 	}
 	err = prepareBrowserProfile(profilePath)
 	if err != nil {

meek-client-torbrowser/windows.go

@@ -8,9 +8,10 @@ package main
 import "os/exec"
 
 const (
-	firefoxPath         = "./firefox.exe"
-	firefoxProfilePath  = "TorBrowser/Data/Browser/profile.meek-http-helper"
-	profileTemplatePath = ""
+	firefoxPath                  = "./firefox.exe"
+	firefoxProfilePath           = "TorBrowser/Data/Browser/profile.meek-http-helper"
+	torDataDirFirefoxProfilePath = ""
+	profileTemplatePath          = ""
 )
 
 func osSpecificCommandSetup(cmd *exec.Cmd) {