The configuration file is a list of setting=value pairs, one per line, with optional comments starting with the # character. Each bridge node must be saved in one bridge configuration line. After further analysis of the process “obfs4proxy.exe”, I learned it used another API called “MSAFD_ConnectEx” from mswsock.dll instead.Figure 5 shows that “obfs4proxy.exe” is about to call the API “mswsock.MSAFD_ConnectEx()” to make a TCP connection to a built-in “obfs4” bridge, whose IP address and port are “192.95.36.142:443”. All of the analysis below is based on this kind of bridge. This could be very convenient for launching TBB with a specific URL to run tests or experiments. As you may know, Firefox browser can perform extension functions through Prior to version 9.0, Tor Browser comes with two extensions: Torbutton and TorLauncher. In Table 1, “…\” is short for the Tor Browser’s installation path. “tor.exe” will listen on these two TCP ports 9151 and 9150 of the loopback interface (127.0.0.1), which are the default port numbers that “tor.exe” uses.Users can modify the two ports’ default values, which are defined in several local files. All command-line options (except for -datadir and -conf) may be specified in a configuration file, and all configuration file options may also be specified on the command line.Command-line options override values set in the configuration file. In this blog I will be discussing how to find these bridges and relay nodes using functions built into Tor Browser.To use a bridge relay in Tor Browser, there are two options. The process tree when using “obfs4” bridgeFigure 6.
Figure 11 shows a screenshot of the command line parameters passed to “tor.exe” when “firefox.exe” was about to start “tor.exe”.
I know there are probably other and easier ways to do this, but I need to do it this way because I … Someone just posted a gist somewhere for this too, though I lost track of that ticket.
If the built-in bridges don’t work, the users can obtain additional bridges from the Tor Network Settings, by visiting https://bridges.torproject.org/, or by sending an email to bridges@bridges.torproject.org.This analysis is done on the following platform, as well as the following Tor Browser version and extensions:Figure 2 shows the version information of Tor Browser that I worked on.During my analysis, Tor Brower pushed out a new version: Tor Browser 9.0, on October 22, 2019. Feel free to reopen if you need anything else.tor-prompt / tor-cli as a shell command line tool to talk to Tor's ControlPort For bugs and requests, please file a ticket in The Tor Project's bug tracker. If you're going to be doing work in the “dark web”, it'll be useful to understand how to quickly and easily run Figure 12 shows the packets when visiting https://www.google.com in Tor Brower. Usually, using reverse engineering could quickly discover the IP addresses and ports from this API. When Tor browser is set to enable the Obfs4 Bridge in “Tor Network Settings”, “tor.exe” will run “obfs4proxy.exe” up.In next 2 sections, we’ll explain how the 3 components (“firefox.exe”, “tor.exe” and “obfs4proxy.exe”) interact in-depth.The processes “firefox.exe” (Tor Browser) and “tor.exe” (Tor Client) communicate to each other through Tor’s TCP port listening on the loopback interface (127.0.0.1).From Figure 4 above, it is clear that “firefox.exe” starts “tor.exe”. You can also contact me privately: See also comment by Roger: Some commands that worked for me were as follows (Ubuntu 12.04 & TBB v3.5): I then set a breakpoint on the API “connect”, which is often used to establish TCP connections. Tor Browser has some built-in bridges for users to choose. “obfs4proxy.exe” received one “obfs4” bridge’s IP address and PortFigure 7. The ASM code snippet below shows the context of calling “libevent.event_new()” in “tor.exe”.
When it calls the Windows native API ShellExecuteExW() to start “tor.exe”, many command line parameters are passed to “tor.exe”. Choosing a built-in bridge on Tor Network SettingsFigure 4.
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