709 lines
21 KiB
Nix
709 lines
21 KiB
Nix
{ config, lib, pkgs, ... }:
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# TODO unify logging of shell scripts to user and journal
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# TODO move all scripts to ${etcDir}, so ControlMaster connections
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# immediately pick up new authenticators
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# TODO when authorized_keys changes, then restart ssh
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# (or kill already connected users somehow)
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with import ../../lib/pure.nix { inherit lib; };
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let
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cfg = config.krebs.git;
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out = {
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options.krebs.git = api;
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config = with lib; lib.mkIf cfg.enable (mkMerge [
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(lib.mkIf cfg.cgit.enable cgit-imp)
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git-imp
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]);
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};
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api = {
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enable = mkEnableOption "krebs.git";
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cgit = mkOption {
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type = types.submodule {
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options = {
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enable = mkEnableOption "krebs.git.cgit" // { default = true; };
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fcgiwrap = {
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group = mkOption {
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type = types.group;
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default = {
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name = "fcgiwrap";
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};
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};
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user = mkOption {
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type = types.user;
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default = {
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name = "fcgiwrap";
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home = toString pkgs.emptyDirectory;
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};
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};
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};
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settings = mkOption {
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apply = flip removeAttrs ["_module"];
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default = {};
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type = subtypes.cgit-settings;
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};
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};
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};
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default = {};
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description = ''
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Cgit is an attempt to create a fast web interface for the git version
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control system, using a built in cache to decrease pressure on the
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git server.
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cgit in this module is being served via fastcgi nginx.This module
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deploys a http://cgit.‹hostname› nginx configuration and enables nginx
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if not yet enabled.
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'';
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};
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dataDir = mkOption {
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type = types.str;
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default = "/var/lib/git";
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description = "Directory used to store repositories.";
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};
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etcDir = mkOption {
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type = mkOptionType {
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name = "${types.absolute-pathname.name} starting with `/etc/'";
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check = x: types.absolute-pathname.check x && hasPrefix "/etc/" x;
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merge = mergeOneOption;
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};
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default = "/etc/git";
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};
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repos = mkOption {
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type = types.attrsOf subtypes.repo;
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default = {};
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example = literalExample ''
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{
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testing = {
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name = "testing";
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hooks.post-update = '''
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#! /bin/sh
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set -euf
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echo post-update hook: $* >&2
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''';
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};
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testing2 = { name = "testing2"; };
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}
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'';
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description = ''
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Repositories.
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'';
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};
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rules = mkOption {
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type = types.listOf subtypes.rule;
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default = [];
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example = literalExample ''
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singleton {
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user = [ config.krebs.users.tv ];
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repo = [ testing ]; # see literal example of repos
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perm = push "refs/*" (with git; [
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non-fast-forward create delete merge
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]);
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}
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'';
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description = ''
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access and permission rules for git repositories.
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'';
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};
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user = mkOption {
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type = types.user;
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default = {
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name = "git";
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home = toString pkgs.emptyDirectory;
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};
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};
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};
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# TODO put into krebs/4lib/types.nix?
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subtypes = {
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cgit-settings = types.submodule {
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# A setting's value of `null` means cgit's default should be used.
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options = {
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about-filter = mkOption {
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type = types.nullOr types.package;
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default = null;
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};
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cache-root = mkOption {
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type = types.absolute-pathname;
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default = "/tmp/cgit";
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};
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cache-size = mkOption {
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type = types.uint;
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default = 1000;
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};
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css = mkOption {
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type = types.absolute-pathname;
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default = "/static/cgit.css";
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};
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enable-commit-graph = mkOption {
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type = types.bool;
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default = true;
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};
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enable-index-links = mkOption {
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type = types.bool;
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default = true;
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};
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enable-index-owner = mkOption {
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type = types.bool;
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default = false;
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};
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enable-log-filecount = mkOption {
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type = types.bool;
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default = true;
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};
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enable-log-linecount = mkOption {
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type = types.bool;
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default = true;
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};
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enable-remote-branches = mkOption {
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type = types.bool;
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default = true;
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};
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logo = mkOption {
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type = types.absolute-pathname;
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default = "/static/cgit.png";
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};
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max-stats = mkOption {
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type =
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types.nullOr (types.enum ["week" "month" "quarter" "year"]);
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default = "year";
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};
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readme = mkOption {
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type = types.listOf types.str;
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default = [];
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};
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robots = mkOption {
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type = types.nullOr (types.listOf types.str);
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default = ["nofollow" "noindex"];
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};
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root-desc = mkOption {
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type = types.nullOr types.str;
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default = null;
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};
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root-title = mkOption {
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type = types.nullOr types.str;
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default = null;
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};
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source-filter = mkOption {
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type = types.nullOr types.absolute-pathname;
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default = null;
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example = literalExample
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"\${pkgs.cgit}/lib/cgit/filters/syntax-highlighting.py";
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};
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virtual-root = mkOption {
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type = types.nullOr types.absolute-pathname;
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default = "/";
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};
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};
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};
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repo = types.submodule ({ config, ... }: {
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options = {
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admins = mkOption {
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type = types.listOf types.user;
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default = [];
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description = ''
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List of users that should be able to do everything with this repo.
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This option is currently not used by krebs.git but instead can be
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used to create rules. See e.g. ‹stockholm/lass/2configs/git.nix› for
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an example.
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'';
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};
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cgit = {
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desc = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Repository description.
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'';
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};
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path = mkOption {
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type = types.str;
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default = "${cfg.dataDir}/${config.name}";
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defaultText = "${cfg.dataDir}/‹reponame›";
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description = ''
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An absolute path to the repository directory. For non-bare
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repositories this is the .git-directory.
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'';
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};
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section = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Repository section.
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'';
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};
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url = mkOption {
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type = types.str;
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default = config.name;
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defaultText = "‹reponame›";
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description = ''
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The relative url used to access the repository.
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'';
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};
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};
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collaborators = mkOption {
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type = types.listOf types.user;
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default = [];
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description = ''
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List of users that should be able to fetch from this repo.
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This option is currently not used by krebs.git but instead can be
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used to create rules. See e.g. ‹stockholm/tv/2configs/git.nix› for
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an example.
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'';
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};
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name = mkOption {
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type = types.str;
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description = ''
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Repository name.
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'';
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defaultText = "‹reponame›";
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};
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hooks = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = ''
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Repository-specific hooks.
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'';
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};
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public = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Allow everybody to read the repository via HTTP if cgit enabled.
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'';
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# TODO allow every configured user to fetch the repository via SSH.
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};
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};
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});
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rule = types.submodule ({ config, ... }: {
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options = {
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user = mkOption {
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type = types.listOf types.user;
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description = ''
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List of users this rule should apply to.
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Checked by authorize-command.
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'';
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};
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repo = mkOption {
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type = types.listOf subtypes.repo;
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description = ''
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List of repos this rule should apply to.
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Checked by authorize-command.
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'';
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};
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perm = mkOption {
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type = types.submodule {
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# TODO generate enum argument from krebs/4lib/git.nix
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options = {
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allow-commands = mkOption {
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type = types.listOf (types.enum (with git; [
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git-receive-pack
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git-upload-pack
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]));
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default = [];
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description = ''
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List of commands the rule's users are allowed to execute.
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Checked by authorize-command.
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'';
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};
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allow-receive-ref = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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Ref that can receive objects.
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Checked by authorize-push.
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'';
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};
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allow-receive-modes = mkOption {
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type = types.listOf (types.enum (with git; [
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fast-forward
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non-fast-forward
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create
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delete
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merge
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]));
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default = [];
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description = ''
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List of allowed receive modes.
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Checked by pre-receive hook.
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'';
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};
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};
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};
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description = ''
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Permissions granted.
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'';
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};
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};
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});
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};
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git-imp = {
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system.activationScripts.git-init = "${init-script}";
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# TODO maybe put all scripts here and then use PATH?
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environment.etc.${removePrefix "/etc/" cfg.etcDir}.source =
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scriptFarm "git-ssh-authorizers" {
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authorize-command = makeAuthorizeScript (map (rule: [
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(map getName (toList rule.user))
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(map getName (toList rule.repo))
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(map getName rule.perm.allow-commands)
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]) cfg.rules);
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authorize-push = makeAuthorizeScript (map (rule: [
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(map getName (toList rule.user))
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(map getName (toList rule.repo))
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(toList rule.perm.allow-receive-ref)
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(map getName rule.perm.allow-receive-modes)
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]) (filter (rule: rule.perm.allow-receive-ref != null) cfg.rules));
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};
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users.users.${cfg.user.name} = {
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inherit (cfg.user) home name uid;
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description = "Git repository hosting user";
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# To allow running cgit-clear-cache via hooks.
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group = cfg.cgit.fcgiwrap.group.name;
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isSystemUser = true;
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shell = "/bin/sh";
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openssh.authorizedKeys.keys =
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unique
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(sort lessThan
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(map (makeAuthorizedKey git-ssh-command)
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(filter (user: isString user.pubkey)
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(concatMap (getAttr "user") cfg.rules))));
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};
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};
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cgit-imp = {
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users = {
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groups.${cfg.cgit.fcgiwrap.group.name} = {
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inherit (cfg.cgit.fcgiwrap.group) name gid;
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};
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users.${cfg.cgit.fcgiwrap.user.name} = {
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inherit (cfg.cgit.fcgiwrap.user) home name uid;
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group = cfg.cgit.fcgiwrap.group.name;
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isSystemUser = true;
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};
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};
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services.fcgiwrap = {
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enable = true;
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user = cfg.cgit.fcgiwrap.user.name;
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group = cfg.cgit.fcgiwrap.group.name;
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# socketAddress = "/run/fcgiwrap.sock" (default)
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# socketType = "unix" (default)
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};
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environment.etc."cgitrc".text = let
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repo-to-cgitrc = _: repo:
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optionals (isPublicRepo repo) (concatLists [
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[""] # empty line
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[(kv-to-cgitrc "repo.url" repo.cgit.url)]
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(mapAttrsToList kv-to-cgitrc
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(mapAttrs' (k: nameValuePair "repo.${k}")
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(removeAttrs repo.cgit ["url"])))
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]);
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kv-to-cgitrc = k: v: getAttr (typeOf v) {
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bool = kv-to-cgitrc k (if v then 1 else 0);
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null = []; # This will be removed by `flatten`.
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list = {
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readme = map (x: "readme=${x}") v;
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}.${k} or "${k}=${concatStringsSep ", " v}";
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int = "${k}=${toString v}";
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set =
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if subtypes.cgit-settings.check v
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then "${k}=${v}"
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else error "kv-to-cgitrc: unhandled type: set";
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string = "${k}=${v}";
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};
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in
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concatStringsSep "\n"
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(flatten (
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mapAttrsToList kv-to-cgitrc cfg.cgit.settings
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++
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mapAttrsToList repo-to-cgitrc cfg.repos
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));
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environment.systemPackages = [
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(pkgs.cgit-clear-cache.override { inherit (cfg.cgit.settings) cache-root; })
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];
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system.activationScripts.cgit = ''
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mkdir -m 0770 -p ${cfg.cgit.settings.cache-root}
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chmod 0770 ${cfg.cgit.settings.cache-root}
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chown ${toString cfg.cgit.fcgiwrap.user.name}:${toString cfg.cgit.fcgiwrap.group.name} ${cfg.cgit.settings.cache-root}
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'';
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services.nginx.virtualHosts.cgit = {
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serverAliases = [
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"cgit.${config.networking.hostName}"
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"cgit.${config.networking.hostName}.r"
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];
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locations."/".extraConfig = ''
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include ${pkgs.nginx}/conf/fastcgi_params;
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fastcgi_param SCRIPT_FILENAME ${pkgs.writers.writeDash "cgit-wrapper" ''
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set -efu
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exec 3>&1
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${pkgs.cgit}/cgit/cgit.cgi "$@" 2>&1 >&3 3>&- \
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| ${pkgs.gnused}/bin/sed \
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'
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\|^${pkgs.cgit}/cgit/cgit.cgi: Relink |d
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'
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exec 3>&-
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''};
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fastcgi_param PATH_INFO $uri;
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fastcgi_param QUERY_STRING $args;
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fastcgi_param HTTP_HOST $server_name;
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fastcgi_pass unix:${config.services.fcgiwrap.socketAddress};
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'';
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# Smart HTTP transport. Regex based on.
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# https://github.com/git/git/blob/v2.27.0/http-backend.c#L708-L721
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locations."~ \"^/[0-9A-Za-z._-]+/(HEAD|info/refs|objects/info/(alternates|http-alternates|packs)|[0-9a-f]{2}/([0-9a-f]{38}|[0-9a-f]{62})|pack/pack-([0-9a-f]{40}|[0-9a-f]{64})\\.(pack|idx)|git-upload-pack|git-receive-pack)$\"".extraConfig = ''
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include ${pkgs.nginx}/conf/fastcgi_params;
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fastcgi_param GIT_HTTP_EXPORT_ALL "";
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fastcgi_param GIT_PROJECT_ROOT ${cfg.dataDir};
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fastcgi_param PATH_INFO $fastcgi_script_name;
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fastcgi_param SCRIPT_FILENAME ${pkgs.git}/bin/git-http-backend;
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fastcgi_pass unix:${config.services.fcgiwrap.socketAddress};
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'';
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locations."/static/".extraConfig = ''
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root ${pkgs.cgit}/cgit;
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rewrite ^/static(/.*)$ $1 break;
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'';
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};
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};
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getName = x: x.name;
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isPublicRepo = getAttr "public"; # TODO this is also in ./cgit.nix
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makeAuthorizedKey = git-ssh-command: user@{ name, pubkey, ... }:
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# TODO assert name
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# TODO assert pubkey
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let
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options = concatStringsSep "," [
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''command="exec ${git-ssh-command} ${name}"''
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"no-agent-forwarding"
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"no-port-forwarding"
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"no-pty"
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"no-X11-forwarding"
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];
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in
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"${options} ${pubkey}";
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# [case-pattern] -> shell-script
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# Create a shell script that succeeds (exit 0) when all its arguments
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# match the case patterns (in the given order).
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makeAuthorizeScript =
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let
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# TODO escape
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to-pattern = x: concatStringsSep "|" (toList x);
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go = i: ps:
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if ps == []
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then "exit 0"
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else ''
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case ''$${toString i} in ${to-pattern (head ps)})
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${go (i + 1) (tail ps)}
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esac'';
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in
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patterns: ''
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#! /bin/sh
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set -euf
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${concatStringsSep "\n" (map (go 1) patterns)}
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exit -1
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'';
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reponames = rules: sort lessThan (unique (map (x: x.repo.name) rules));
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# TODO use pkgs.write (from nix-writers)
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scriptFarm =
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farm-name: scripts:
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let
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makeScript = script-name: script-string: {
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name = script-name;
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path = pkgs.writeScript "${farm-name}_${script-name}" script-string;
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};
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in
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pkgs.linkFarm farm-name (mapAttrsToList makeScript scripts);
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git-ssh-command = pkgs.writeScript "git-ssh-command" ''
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#! /bin/sh
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set -euf
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PATH=${makeBinPath (with pkgs; [
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coreutils
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git
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gnugrep
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gnused
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systemd
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])}
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abort() {
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echo "error: $1" >&2
|
||
systemd-cat -p err -t git echo "error: $1"
|
||
exit -1
|
||
}
|
||
|
||
GIT_SSH_USER=$1
|
||
|
||
systemd-cat -p info -t git echo \
|
||
"authorizing $GIT_SSH_USER $SSH_CONNECTION $SSH_ORIGINAL_COMMAND"
|
||
|
||
# References: The Base Definitions volume of
|
||
# POSIX.1‐2013, Section 3.278, Portable Filename Character Set
|
||
portable_filename_bre="^[A-Za-z0-9._-]\\+$"
|
||
|
||
command=$(echo "$SSH_ORIGINAL_COMMAND" \
|
||
| sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\1/p' \
|
||
| grep "$portable_filename_bre" \
|
||
|| abort 'cannot read command')
|
||
|
||
GIT_SSH_REPO=$(echo "$SSH_ORIGINAL_COMMAND" \
|
||
| sed -n 's/^\([^ ]*\) '"'"'\(.*\)'"'"'/\2/p' \
|
||
| grep "$portable_filename_bre" \
|
||
|| abort 'cannot read reponame')
|
||
|
||
${cfg.etcDir}/authorize-command \
|
||
"$GIT_SSH_USER" "$GIT_SSH_REPO" "$command" \
|
||
|| abort 'access denied'
|
||
|
||
repodir=${escapeShellArg cfg.dataDir}/$GIT_SSH_REPO
|
||
|
||
systemd-cat -p info -t git \
|
||
echo "authorized exec $command $repodir"
|
||
|
||
export GIT_SSH_USER
|
||
export GIT_SSH_REPO
|
||
exec "$command" "$repodir"
|
||
'';
|
||
|
||
init-script = pkgs.writeScript "git-init" ''
|
||
#! /bin/sh
|
||
set -euf
|
||
|
||
PATH=${makeBinPath (with pkgs; [
|
||
coreutils
|
||
findutils
|
||
gawk
|
||
git
|
||
gnugrep
|
||
gnused
|
||
])}
|
||
|
||
dataDir=${escapeShellArg cfg.dataDir}
|
||
mkdir -p "$dataDir"
|
||
|
||
# Notice how the presence of hooks symlinks determine whether
|
||
# we manage a repositry or not.
|
||
|
||
# Make sure that no existing repository has hooks. We can delete
|
||
# symlinks because we assume we created them.
|
||
find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks -type l -delete
|
||
bad_hooks=$(find "$dataDir" -mindepth 2 -maxdepth 2 -name hooks)
|
||
if echo "$bad_hooks" | grep -q .; then
|
||
printf 'error: unknown hooks:\n%s\n' \
|
||
"$(echo "$bad_hooks" | sed 's/^/ /')" \
|
||
>&2
|
||
exit -1
|
||
fi
|
||
|
||
# Initialize repositories.
|
||
${concatMapStringsSep "\n" (repo:
|
||
let
|
||
hooks = scriptFarm "git-hooks" (makeHooks repo);
|
||
in
|
||
''
|
||
reponame=${escapeShellArg repo.name}
|
||
repodir=$dataDir/$reponame
|
||
mode=${toString (if isPublicRepo repo then 0711 else 0700)}
|
||
if ! test -d "$repodir"; then
|
||
mkdir -m "$mode" "$repodir"
|
||
git init --bare --template=/var/empty "$repodir"
|
||
# TODO fix correctly with stringAfter
|
||
chown -R ${toString config.users.users.git.uid}:nogroup "$repodir"
|
||
fi
|
||
ln -Tfs ${hooks} "$repodir/hooks"
|
||
''
|
||
) (attrValues cfg.repos)}
|
||
|
||
# Warn about repositories that exist but aren't mentioned in the
|
||
# current configuration (and thus didn't receive a hooks symlink).
|
||
unknown_repos=$(find "$dataDir" -mindepth 1 -maxdepth 1 \
|
||
-type d \! -exec test -e '{}/hooks' \; -print)
|
||
if echo "$unknown_repos" | grep -q .; then
|
||
printf 'warning: stale repositories:\n%s\n' \
|
||
"$(echo "$unknown_repos" | sed 's/^/ /')" \
|
||
>&2
|
||
fi
|
||
'';
|
||
|
||
makeHooks = repo: removeAttrs repo.hooks [ "pre-receive" ] // {
|
||
pre-receive = ''
|
||
#! /bin/sh
|
||
set -euf
|
||
|
||
PATH=${makeBinPath (with pkgs; [
|
||
coreutils # env
|
||
git
|
||
systemd
|
||
])}
|
||
|
||
accept() {
|
||
#systemd-cat -p info -t git echo "authorized $1"
|
||
accept_string="''${accept_string+$accept_string
|
||
}authorized $1"
|
||
}
|
||
reject() {
|
||
#systemd-cat -p err -t git echo "denied $1"
|
||
#echo 'access denied' >&2
|
||
#exit_code=-1
|
||
reject_string="''${reject_string+$reject_string
|
||
}access denied: $1"
|
||
}
|
||
|
||
empty=0000000000000000000000000000000000000000
|
||
|
||
accept_string=
|
||
reject_string=
|
||
while read oldrev newrev ref; do
|
||
|
||
if [ $oldrev = $empty ]; then
|
||
receive_mode=create
|
||
elif [ $newrev = $empty ]; then
|
||
receive_mode=delete
|
||
elif [ "$(git merge-base $oldrev $newrev)" = $oldrev ]; then
|
||
receive_mode=fast-forward
|
||
else
|
||
receive_mode=non-fast-forward
|
||
fi
|
||
|
||
if ${cfg.etcDir}/authorize-push \
|
||
"$GIT_SSH_USER" "$GIT_SSH_REPO" "$ref" "$receive_mode"; then
|
||
accept "$receive_mode $ref"
|
||
else
|
||
reject "$receive_mode $ref"
|
||
fi
|
||
done
|
||
|
||
if [ -n "$reject_string" ]; then
|
||
systemd-cat -p err -t git echo "$reject_string"
|
||
exit -1
|
||
fi
|
||
|
||
systemd-cat -p info -t git echo "$accept_string"
|
||
|
||
${optionalString (hasAttr "post-receive" repo.hooks) ''
|
||
# custom post-receive hook
|
||
${repo.hooks.post-receive}''}
|
||
'';
|
||
};
|
||
|
||
in
|
||
out
|