tangled.org
anirudh.fi
+30
-48
docs/knot-hosting.md
+30
-48
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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+
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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
47
-
go build -o repoguard ./cmd/repoguard
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+
go build -o knot ./cmd/knot
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51
```
49
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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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55
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56
```
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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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58
```
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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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72
```
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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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79
```
75
80
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-
Copy the `repoguard` binary to the `git` user's home directory:
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-
78
-
```
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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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-
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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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85
```
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KNOT_REPO_SCAN_PATH=/home/git
···
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94
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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98
102
99
```
···
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158
KNOT_REPO_SCAN_PATH=/home/git/repositories
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159
```
163
160
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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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163
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```
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+
sudo tee /etc/ssh/sshd_config.d/authorized_keys_command.conf <<EOF
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166
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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168
AuthorizedKeysCommandUser nobody
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-
```
172
-
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-
Make sure to restart your SSH server!
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-
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-
#### git
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-
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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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-
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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`)
182
-
and update the `AuthorizedKeysCommand` line:
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-
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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
169
+
EOF
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170
```
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Make sure to restart your SSH server!