Document copy-install, local (portable) configuration, ssl/tls configuration
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Command-Line.md
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Command-Line.md
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@ -31,6 +31,7 @@ command output
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- [Windows Service](#windows_service)
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- [Text File Configuration](#text_config)
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- [Server Configuration File](#server_config)
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- [SSL/TLS Configuration](#ssl_config)
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---
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@ -59,6 +60,42 @@ To add the directory to `%PATH%`:
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This will only effect command prompts opened after the change.
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### Portable
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The command line version of Barrier is a single client executable `barrierc.exe`
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and a single server executable `barriers.exe`. They both have a dependency to OpenSSL
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libraries, `libeay32.dll` and `ssleay32.dll` (used for encryption with argument
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`--enable-crypto`), as well as Microsoft Visual C++ runtime libraries.
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From an existing installation you can copy the necessary program files to
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a location of choice, to get a command line only portable (depending on configuration)
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installation. Copy the following files from the installation directory `C:\Program Files\Barrier`:
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```
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barrierc.exe
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barriers.exe
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libeay32.dll
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ssleay32.dll
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```
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To be able to generate server certificate, you can also choose to include the OpenSSL
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application itself (on the server), together with Barrier's predefined OpenSSL
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configuration file:
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```
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openssl.exe
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barrier.conf
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```
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As long as you have the [Microsoft Visual C++ Redistributable for Visual Studio 2019](https://visualstudio.microsoft.com/downloads/) installed (or copy the necessary runtime libaries
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`msvcp140.dll`, `vcruntime140.dll` and `vcruntime140_1.dll` into the application directory),
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you will now have a stand-alone application directory that you can manually copy into computers
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where you need it.
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For a completely portable installation, with local configuration, you must configure the
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location of server configuration file and SSL/TLS configuration files. See [Text File Configuration](#text_config), [Server Command Line Options](#server_cli),
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[Client Command Line Options](#client_cli) and [SSL/TLS Configuration](#ssl_config), below.
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<a href="#top">Back to top</a>
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---
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@ -119,6 +156,7 @@ Options:
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--no-tray disable the system tray icon.
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--enable-drag-drop enable file drag & drop.
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--enable-crypto enable the crypto (ssl) plugin.
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--profile-dir <path> use named profile directory instead.
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-f, --no-daemon run in the foreground.
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```
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@ -147,6 +185,7 @@ Options:
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--no-tray disable the system tray icon.
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--enable-drag-drop enable file drag & drop.
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--enable-crypto enable the crypto (ssl) plugin.
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--profile-dir <path> use named profile directory instead.
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-f, --no-daemon run in the foreground.
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--daemon run as a daemon. (*)
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```
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@ -231,12 +270,24 @@ The Services snap-in can be accessed by pressing `(⊞ Win) + R` and typing
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If you use Barrier from the command line you may need to create a configuration
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file. Configuration files can be copied from their default GUI locations as a
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baseline.
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baseline.
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The client will use the configuration specified by the server.
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When a text file configuration is used it needs to be specified with the
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`--config` option on the command line or it will use the default locations.
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By default the server will look for a configuration file at the following paths, in prioritized order:
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- User specific location: `%LocalAppData%\Barrier\barrier.sgc` on Windows, `~/.local/share/barrier/.barrier.conf` or `$XDG_DATA_HOME/barrier/.barrier.conf` on Linux.
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- System shared location: `C:\ProgramData\Barrier\barrier.sgc` on Windows, `/etc/barrier.conf` on Linux.
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The user specific location can be customized with command line argument `--profile-dir`,
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and Barrier will look for a configuration file with default name (`barrier.sgc` on Windows,
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`.barrier.conf` on Linux) there:
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```shell
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barriers --profile-dir ~/barrier/config/path ...
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```
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You can also use command line argument `--config` to set path to a specific configuration
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file that should be used.
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```shell
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barriers --config ~/barrier/config/path/file.conf ...
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@ -489,4 +540,73 @@ sections, `[General]` and `[internalConfig]`.
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<a href="#top">Back to top</a>
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## <a name="ssl_config">SSL/TLS Configuration</a>
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Barrier supports SSL/TLS encryption, by use of the `OpenSSL` library (included).
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This must be anabled with command line argument `--enable-crypto`, and requires a
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certificate and fingerprint to be configured.
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The SSL related configuration is kept in subdirectory "SSL" in the same user specific location
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as the [text file configuration](#text_config) is loaded from: By default
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`%LocalAppData%\Barrier\SSL` on Windows, `~/.local/share/barrier/SSL` or `$XDG_DATA_HOME/barrier/SSL`
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on Linux, but configurable with command line argument `--profile-dir`.
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On the server, the root of the SSL directory must contain the certificate as a file
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with name `Barrier.pem`, containing the private and public key.
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Barrier uses fingerprints to validate that a malicious server is not trying to intercept a client
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connection. A server's fingerprint must be generated from the certificate, and may be kept
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in file `SSL/Fingerprints/Local.txt` on the server. All clients must have the fingerprint
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hash string of trusted servers in a file `SSL/Fingerprints/TrustedServers.txt`.
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When connecting to a server, if it presents a fingerprint not explicitely trusted by the client,
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it will refuse the connection. See also [Fingerprint trust troubleshooting](https://github.com/debauchee/barrier/wiki/Troubleshooting#fingerprint-trust).
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The server will therefore typically contain the following files:
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```
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/SSL/Barrier.pem
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/SSL/Fingerprints/Local.txt
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```
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Clients must contain the following file:
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```
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/SSL/Fingerprints/TrustedServers.txt
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```
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### Generating certificate and fingerprint
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The main UI application has built-in functionality to generate a self-signed server certificate,
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and fingerprint. In a command line only ([portable](#portable)) environment you will have to create these manually,
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using the OpenSSL command line utility, which is included in a Barrier installation together
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with a Barrier specific OpenSSL configuration file `barrier.conf`. To create them the same
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way as the UI application does, you can follow the following Windows example.
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It uses `openssl.exe` and `barrier.conf` from a Barrier installed in
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`C:\Program Files\Barrier`, generating configuration in `%LocalAppData%\Barrier\SSL`.
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If you have the OpenSSL files in a different location and/or are planning to keep the SSL files in a
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custom location specified with command line argument `--profile-dir`, you must change the paths in the example accordingly.
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```
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mkdir "%LocalAppData%\Barrier\SSL\Fingerprints" >NUL 2>&1
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set OPENSSL_CONF=C:\Program Files\Barrier\barrier.conf
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SET RANDFILE=%LocalAppData%\Barrier\SSL\.rnd
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"C:\Program Files\Barrier\openssl.exe" req -x509 -nodes -days 365 -subj /CN=Barrier -newkey rsa:2048 -keyout "%LocalAppData%\Barrier\SSL\Barrier.pem" -out "%LocalAppData%\Barrier\SSL\Barrier.pem"
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IF EXIST "%RANDFILE%" DEL "%RANDFILE%"
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"C:\Program Files\Barrier\openssl.exe" x509 -fingerprint -sha1 -noout -in "%LocalAppData%\Barrier\SSL\Barrier.pem" > "%LocalAppData%\Barrier\SSL\Fingerprints\Local.txt"
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```
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Now, on any clients you must manually create the `%LocalAppData%\Barrier\SSL\Fingerprints\TrustedServers.txt` file,
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with the hash from the server's `%LocalAppData%\Barrier\SSL\Fingerprints\Local.txt`.
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Given the server's Local.txt contains:
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```
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SHA1 Fingerprint=96:32:AB:DD:38:5C:E5:21:20:8E:52:E8:83:28:A0:2A:CC:CC:8F:A3
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```
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You must put the following into the client's TrustedServers.txt:
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```
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96:32:AB:DD:38:5C:E5:21:20:8E:52:E8:83:28:A0:2A:CC:CC:8F:A3
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```
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---
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@ -14,7 +14,7 @@ At this time Immune Keys are a Windows-only feature; your keyboard must be conne
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## Immune Keys Procedure
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- Check [this table](https://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx) for the virtual key code value of the key you want to immune.
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- Create or open ImmuneKeys.txt inside the C:\Users\USERNAME\AppData\Local\Barrier folder.
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- Create or open ImmuneKeys.txt inside your profile directory, %LocalAppData%\Barrier by default, configurable with `--profile-dir` when running from [command line](Command-Line.md).
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- Add one line per key to this file, save it, and close it.
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- Each line starts with a keycode in decimal or hexadecimal and can follow with human-readable text to use as a comment field.
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- Any line that starts with a # is considered a comment line and is ignored. Blank lines are also ignored.
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