_Really_ lightweight git access control
tobiaswiese and cbdevnet
This will make the client display the error message from the server instead of failing with a protocol violation error.
Latest commit 1247261
Jan 23, 2019
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Rudimentary (as in, really not that advanced) git access control using SSH key magic and plain text files. If you want more features, use gitolite or something along those lines. Found a bug? Report it - or even better, fix it and send a pull request! Configuring fugit requires experience with configuring ssh, key-based logins, git and, should something break, bash. It might contain some vulnerabilities I have not yet found, so check the code for yourself. Still, you probably should only give SSH access to people you trust in any case. Setup ----- Set up a system user. Clone this repo into the home of the new user and copy fugit to ~/sbin/fugit. Make sure ~/sbin/fugit is executable. If you like, change the log destination from the default (fugit.log) on line 4 You can also change the config directory from the default ($HOME/fugit/) on line 6. Add the keys used to identify users to .ssh/authorized_keys and add a forced command executing "~/sbin/fugit <user identifier>" (see the demo file in the repo for an example). You might also want to add some or all of no-pty,no-port-forwarding,no-X11-forwarding,no-agent-forwarding to the key options. fugit allows you to choose between two methods of access control: file-based (default) and directory-based. To select directory-based access control, edit the CONF variable to point to a directory. The access control methods have the following structure File-based: Edit the configuration file (default: fugit.conf) to contain exactly 4 lines of text per repository to be served. Those should be, exactly in this order REPO <repo-identifier> //Identifies the remote REAL=<path> //Path to the repo on disk PUSH="<list of users>" //Users allowed to push to the repo PULL="<list of users>" //Users allowed to pull from the repo Directory-based: The configuration for a repository is read from a file, the name of which is determined by replacing all forward slashes ('/') in the submitted repo-identifier with underscores, appending ".conf" and prepending the CONF variable. Example: CONF is "fugit.d" $ git clone ssh://host/repo/identifier => Repo identifier is "/repo/identifier" => Config file is "fugit.d/_repo_identifier.conf" Config files for repositories should contain these 3 lines REAL=<path> //Path to the repo on disk PUSH=<path> //Path to a users file PULL=<path> //Path to a users file The referenced 'users' files should contain one user-identifier per line, to be granted the respective permission. Debugging --------- First, check the log. It should contain all commands processed by fugit. In order to see very verbose debug information at run time, uncomment the set -x line in the beginning of the file. You will now be spammed with execution data upon interacting with repos controlled by fugit. How it works ------------ gits submodules exchange data via stdin/stdout over ssh. fugit inserts itself into that channel, distinguishes between push and pull operations and either allows the channel to continue or simply closes it. It's not exactly rocket science, but it works. Why --- Because I need to restrict git access for one system user serving multiple key-users to specific repositories without fine-grained control. So, really only push/pull/nothing. I reviewed some of the existing options and found them all pretty heavy on instructions, prerequisites and implementation complexity. So I made my own.