Ability to change ssh command script path in `.ssh/authorized_keys`

[axelrindle]

• Gitea version (or commit ref): v1.14.1
• Git version: 2.26.3
• Operating system: Linux pi 5.10.17-v7l+ #1403 SMP Mon Feb 22 11:33:35 GMT 2021 armv7l GNU/Linux
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
• Log gist:

ssh git@...
PTY allocation request failed
bash: /app/gitea/gitea: Datei oder Verzeichnis nicht gefunden
Shared connection to ... closed.

Description

I'm running a Gitea instance inside a Docker container. While the SSH connection works in general, the passthrough as described in the docs does not work, because the file /app/gitea/gitea does not exist on the host. As I don't want to create that path on the host, I'd like to specify an alternative path to the script with the content described in the docs, e.g. /home/git/handle-gitea-ssh.sh.

A new environment variable would probably be suited for this, for example:

[server]
SSH_AUTHORIZED_KEYS_HANDLER=/home/git/handle-gitea-ssh.sh

The changes in the code would probably have to be made here:

gitea/models/ssh_key.go

Lines 89 to 92 in e7fc078

	// AuthorizedString returns formatted public key string for authorized_keys file.
	func (key *PublicKey) AuthorizedString() string {
	return fmt.Sprintf(tplPublicKey, util.ShellEscape(fmt.Sprintf(tplCommand, util.ShellEscape(setting.AppPath), util.ShellEscape(setting.CustomConf), key.ID)), key.Content)
	}

The result should look like this:

- command="/app/gitea/gitea --config=/data/gitea/conf/app.ini serv key-2" ...
+ command="/home/git/handle-gitea-ssh.sh --config=/data/gitea/conf/app.ini serv key-2" ...

I'd probably open a PR by myself, but I don't know any Go 😄

[gimmelemons]

Exactly what I wanted too. I don't want to create the script at a location outside the git home directory and possibly mess up when I do a migration in future.