Document copy-install, local (portable) configuration, ssl/tls configuration

albertony 2020-12-06 22:30:27 +01:00
parent 856c9d050e
commit bb188015e7
2 changed files with 124 additions and 4 deletions

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

@ -14,7 +14,7 @@ At this time Immune Keys are a Windows-only feature; your keyboard must be conne
## Immune Keys Procedure
- 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.
- Create or open ImmuneKeys.txt inside the C:\Users\USERNAME\AppData\Local\Barrier folder.
- 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).
- Add one line per key to this file, save it, and close it.
- Each line starts with a keycode in decimal or hexadecimal and can follow with human-readable text to use as a comment field.
- Any line that starts with a # is considered a comment line and is ignored. Blank lines are also ignored.