veryroundbird.house
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tangled.org/core
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docs/knot-hosting.md: update to reflect latest knot cli change
Signed-off-by: Anirudh Oppiliappan <anirudh@tangled.sh>
anirudh.fi
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docs/knot-hosting.md
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docs/knot-hosting.md
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git clone https://tangled.sh/@tangled.sh/core
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```
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Then, build our binaries (you need to have Go installed):
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* `knotserver`: the main server program
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* `keyfetch`: utility to fetch ssh pubkeys
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* `repoguard`: enforces repository access control
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Then, build the `knot` CLI. This is the knot administration and operation tool.
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For the purpose of this guide, we're only concerned with these subcommands:
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* `knot server`: the main knot server process, typically run as a
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supervised service
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* `knot guard`: handles role-based access control for git over SSH
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(you'll never have to run this yourself)
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* `knot keys`: fetches SSH keys associated with your knot; we'll use
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this to generate the SSH `AuthorizedKeysCommand`
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```
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cd core
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export CGO_ENABLED=1
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go build -o knot ./cmd/knotserver
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go build -o keyfetch ./cmd/keyfetch
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go build -o repoguard ./cmd/repoguard
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go build -o knot ./cmd/knot
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```
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Next, move the `keyfetch` binary to a location owned by `root` --
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`/usr/local/libexec/tangled-keyfetch` is a good choice:
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Next, move the `knot` binary to a location owned by `root` --
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`/usr/local/bin/knot` is a good choice:
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```
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sudo mv keyfetch /usr/local/libexec/tangled-keyfetch
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sudo chown root:root /usr/local/libexec/tangled-keyfetch
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sudo chmod 755 /usr/local/libexec/tangled-keyfetch
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sudo mv knot /usr/local/bin/knot
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```
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This is necessary because SSH `AuthorizedKeysCommand` requires [really specific
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permissions](https://stackoverflow.com/a/27638306). Let's set that up:
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This is necessary because SSH `AuthorizedKeysCommand` requires [really
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specific permissions](https://stackoverflow.com/a/27638306). The
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`AuthorizedKeysCommand` specifies a command that is run by `sshd` to
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retrieve a user's public SSH keys dynamically for authentication. Let's
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set that up.
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```
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sudo tee /etc/ssh/sshd_config.d/authorized_keys_command.conf <<EOF
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Match User git
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AuthorizedKeysCommand /usr/local/libexec/tangled-keyfetch
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AuthorizedKeysCommand /usr/local/bin/knot keys -o authorized-keys
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AuthorizedKeysCommandUser nobody
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EOF
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```
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Next, create the `git` user:
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Next, create the `git` user. We'll use the `git` user's home directory
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to store repositories:
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```
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sudo adduser git
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```
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Copy the `repoguard` binary to the `git` user's home directory:
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```
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sudo cp repoguard /home/git
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sudo chown git:git /home/git/repoguard
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```
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Now, let's set up the server. Copy the `knot` binary to
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`/usr/local/bin/knotserver`. Then, create `/home/git/.knot.env` with the
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following, updating the values as necessary. The `KNOT_SERVER_SECRET` can be
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obtaind from the [/knots](/knots) page on Tangled.
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Create `/home/git/.knot.env` with the following, updating the values as
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necessary. The `KNOT_SERVER_SECRET` can be obtaind from the
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[/knots](/knots) page on Tangled.
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```
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KNOT_REPO_SCAN_PATH=/home/git
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If you run a Linux distribution that uses systemd, you can use the provided
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service file to run the server. Copy
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[`knotserver.service`](https://tangled.sh/did:plc:wshs7t2adsemcrrd4snkeqli/core/blob/master/systemd/knotserver.service)
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[`knotserver.service`](/systemd/knotserver.service)
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to `/etc/systemd/system/`. Then, run:
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```
···
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KNOT_REPO_SCAN_PATH=/home/git/repositories
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```
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In your SSH config (e.g. `/etc/ssh/sshd_config.d/authorized_keys_command.conf`),
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update the `AuthorizedKeysCommand` line to use the new folder. For example:
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Similarly, update your `sshd` `AuthorizedKeysCommand` to use the updated
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repository path:
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```
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sudo tee /etc/ssh/sshd_config.d/authorized_keys_command.conf <<EOF
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Match User git
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AuthorizedKeysCommand /usr/local/libexec/tangled-keyfetch -git-dir /home/git/repositories
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AuthorizedKeysCommand /usr/local/bin/knot keys -o authorized-keys -git-dir /home/git/repositories
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AuthorizedKeysCommandUser nobody
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```
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Make sure to restart your SSH server!
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#### git
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The keyfetch executable takes multiple arguments to change certain paths. You
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can view a full list by running `/usr/local/libexec/tangled-keyfetch -h`.
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As an example, if you wanted to change the path to the repoguard executable,
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you would edit your SSH config (e.g. `/etc/ssh/sshd_config.d/authorized_keys_command.conf`)
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and update the `AuthorizedKeysCommand` line:
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```
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Match User git
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AuthorizedKeysCommand /usr/local/libexec/tangled-keyfetch -repoguard-path /path/to/repoguard
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AuthorizedKeysCommandUser nobody
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EOF
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```
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Make sure to restart your SSH server!