Add package 'mailnix' for assisting in generation of dovecot/postfix files

This commit is contained in:
Thomas Preisner 2025-02-22 20:11:39 +01:00
parent ce2784e17d
commit 955a0ec8ba
9 changed files with 1136 additions and 2 deletions

16
flake.lock generated
View file

@ -1,5 +1,20 @@
{
"nodes": {
"crane": {
"locked": {
"lastModified": 1739936662,
"narHash": "sha256-x4syUjNUuRblR07nDPeLDP7DpphaBVbUaSoeZkFbGSk=",
"owner": "ipetkov",
"repo": "crane",
"rev": "19de14aaeb869287647d9461cbd389187d8ecdb7",
"type": "github"
},
"original": {
"owner": "ipetkov",
"repo": "crane",
"type": "github"
}
},
"flake-compat": {
"flake": false,
"locked": {
@ -97,6 +112,7 @@
},
"root": {
"inputs": {
"crane": "crane",
"flake-parts": "flake-parts",
"git-hooks-nix": "git-hooks-nix",
"nixpkgs": "nixpkgs",

View file

@ -7,6 +7,7 @@
flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
treefmt-nix.url = "github:numtide/treefmt-nix";
treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
crane.url = "github:ipetkov/crane";
git-hooks-nix.url = "github:cachix/git-hooks.nix";
git-hooks-nix.inputs.nixpkgs.follows = "nixpkgs";
};
@ -23,6 +24,7 @@
"aarch64-linux"
];
imports = [
flake-parts.flakeModules.easyOverlay
inputs.treefmt-nix.flakeModule
inputs.git-hooks-nix.flakeModule
];
@ -34,7 +36,10 @@
pkgs,
system,
...
}: {
}: let
craneLib = inputs.crane.mkLib pkgs;
pkgs = nixpkgs.legacyPackages.${system}.extend self.overlays.default;
in {
checks = let
tests = ["internal" "basic" "aliases" "rspamd"];
genTest = testName: {
@ -44,9 +49,20 @@
in
pkgs.lib.listToAttrs (map genTest tests);
devShells.default = pkgs.mkShell {
packages = rec {
default = mailnix;
mailnix = craneLib.buildPackage {
src = craneLib.cleanCargoSource ./pkgs/mailnix;
};
};
overlayAttrs = {
mailnix = config.packages.mailnix;
};
devShells.default = craneLib.devShell {
packages = with pkgs; [
self'.formatter.outPath # Add all formatters to environment
mailnix
];
shellHook = ''
${config.pre-commit.installationScript}
@ -61,6 +77,7 @@
programs = {
actionlint.enable = true;
alejandra.enable = true;
rustfmt.enable = true;
};
settings.global.excludes = [
".envrc"

749
pkgs/mailnix/Cargo.lock generated Normal file
View file

@ -0,0 +1,749 @@
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11
pkgs/mailnix/Cargo.toml Normal file
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@ -0,0 +1,11 @@
[package]
name = "mailnix"
version = "0.1.0"
edition = "2021"
[dependencies]
clap = { version = "4.5.28", features = ["derive"] }
regex = "1.11.1"
serde = { version = "1.0.217", features = ["derive", "rc"] }
serde_with = "3.12.0"
serde_yml = "0.0.12"

22
pkgs/mailnix/src/cli.rs Normal file
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@ -0,0 +1,22 @@
use clap::{Parser, Subcommand};
#[derive(Subcommand, Debug)]
pub enum Commands {
Check,
GenerateUserdb,
GenerateStaticPassdb,
UpdateDynamicPassdb { path: String },
GenerateAliases,
GenerateDeniedRecipients,
GenerateDomains,
}
#[derive(Parser, Debug)]
#[command(author, version, about)]
pub struct Cli {
pub config_path: String,
pub additional_config_path: Option<String>,
#[command(subcommand)]
pub command: Commands,
}

199
pkgs/mailnix/src/config.rs Normal file
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@ -0,0 +1,199 @@
use serde::Deserialize;
use serde_with::formats::PreferMany;
use serde_with::{serde_as, MapPreventDuplicates, OneOrMany};
use regex::Regex;
use std::collections::{HashMap, HashSet};
use std::error::Error;
use std::fs::{self, File};
use std::io::BufReader;
use std::path::Path;
#[serde_as]
#[derive(Debug, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Config {
#[serde(default)]
pub domains: Vec<String>,
#[serde(default)]
#[serde_as(deserialize_as = "MapPreventDuplicates<_, _>")]
pub accounts: HashMap<String, AccountConfig>,
#[serde(default)]
#[serde_as(deserialize_as = "MapPreventDuplicates<_, OneOrMany<_, PreferMany>>")]
pub aliases: HashMap<String, Vec<String>>,
}
fn default_reject_message() -> String {
"This account cannot receive emails.".to_string()
}
#[derive(Clone, Debug, Deserialize)]
pub struct AccountConfig {
#[serde(rename(deserialize = "hashedPassword"))]
#[serde(skip)]
pub hashed_password: String,
#[serde(rename(deserialize = "hashedPassword"))]
hashed_password_: Option<String>,
#[serde(rename(deserialize = "hashedPasswordFile"))]
hashed_password_file_: Option<String>,
#[serde(default, rename(deserialize = "isSystemUser"))]
pub is_system_user: bool,
#[serde(
default = "default_reject_message",
rename(deserialize = "rejectMessage")
)]
pub reject_message: String,
}
fn sanitize_vec(vec: &mut [String]) -> Result<(), Box<dyn Error>> {
let mut seen = HashSet::new();
for item in vec.iter_mut() {
*item = item.to_lowercase();
if !seen.insert(item.clone()) {
return Err(format!("Duplicate entry ({item}) detected, aborting...").into());
}
}
Ok(())
}
fn sanitize_map_keys<T: Clone>(map: &mut HashMap<String, T>) -> Result<(), Box<dyn Error>> {
let mut new_map = HashMap::<String, T>::new();
let mut seen = HashSet::new();
for (k, v) in map.iter() {
let new_k = k.to_lowercase();
new_map.insert(new_k.clone(), v.clone());
if !seen.insert(new_k.clone()) {
return Err(format!("Duplicate entry ({new_k}) detected, aborting...").into());
}
}
*map = new_map;
Ok(())
}
impl Config {
pub fn load<P: AsRef<Path>>(path: P) -> Result<Config, Box<dyn Error>> {
let file = File::open(path)?;
let reader = BufReader::new(file);
let mut cfg: Config = serde_yml::from_reader(reader)?;
cfg.sanitize()?;
for (name, acc) in cfg.accounts.iter_mut() {
match (
acc.hashed_password_.clone(),
acc.hashed_password_file_.clone(),
) {
(Some(_hash), Some(_file)) => {
return Err("Account {name} has both HashedPassword and HashedPasswordFile set, aborting...".into());
}
(Some(hash), None) => {
acc.hashed_password = hash;
}
(None, Some(file)) => {
let hash = fs::read_to_string(file.clone()).unwrap_or_else(|err| {
panic!("Account ({name}): Reading {file} failed: {err:?}")
});
acc.hashed_password = hash.trim().to_string();
}
(None, None) => {
return Err("Account {name} is missing HashedPassword or HashedPasswordFile, aborting...".into());
}
}
}
Ok(cfg)
}
fn sanitize(&mut self) -> Result<(), Box<dyn Error>> {
// standardize capitalization, ...
sanitize_vec(&mut self.domains).unwrap_or_else(|err| panic!("domain: {err:?}"));
sanitize_map_keys(&mut self.accounts).unwrap_or_else(|err| panic!("accounts: {err:?}"));
sanitize_map_keys(&mut self.aliases).unwrap_or_else(|err| panic!("aliases: {err:?}"));
for (from, dests) in self.aliases.iter_mut() {
sanitize_vec(&mut *dests).unwrap_or_else(|err| panic!("aliases ({from}): {err:?}"));
}
Ok(())
}
pub fn check(&self) -> Result<(), Box<dyn Error>> {
// check whether all account domains exist
let re = Regex::new(r"^(?P<local_part>.*)@(?P<domain>.*)$").unwrap();
for name in self.accounts.keys() {
let caps = re
.captures(name)
.ok_or("Mail address regex does not match")
.unwrap();
if !self.domains.contains(&caps["domain"].to_string()) {
panic!("Domain of account \"{name}\" does not exist");
}
}
// check whether aliases have corresponding accounts/domains
for (from, dests) in self.aliases.iter() {
let is_domain = from.contains("@");
if is_domain && !self.accounts.contains_key(from) {
panic!("Aliased from-account \"{from}\" does not exist");
} else if !is_domain && !self.domains.contains(from) {
panic!("Aliased from-domain \"{from}\" does not exist");
}
for dest in dests.iter() {
let is_domain = dest.contains("@");
if is_domain && !self.accounts.contains_key(dest) {
panic!("Aliased dest-account \"{dest}\" does not exist");
} else if !is_domain && !self.domains.contains(dest) {
panic!("Aliased dest-domain \"{dest}\" does not exist");
}
}
}
Ok(())
}
pub fn merge<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Box<dyn Error>> {
let mut other = Config::load(path).unwrap();
if !self
.domains
.iter()
.all(|domain| other.domains.contains(domain))
{
return Err(
"domains: Duplicate entry during merge detected, aborting..."
.to_string()
.into(),
);
}
self.domains.append(&mut other.domains);
if !self
.accounts
.keys()
.all(|name| other.accounts.contains_key(name))
{
return Err(
"accounts: Duplicate entry during merge detected, aborting..."
.to_string()
.into(),
);
}
self.accounts.extend(other.accounts);
if !self
.aliases
.keys()
.all(|alias| other.aliases.contains_key(alias))
{
return Err(
"aliases: Duplicate entry during merge detected, aborting..."
.to_string()
.into(),
);
}
self.aliases.extend(other.aliases);
Ok(())
}
}

View file

@ -0,0 +1,55 @@
use regex::Regex;
use std::collections::HashMap;
use std::error::Error;
use std::fs;
use std::path::Path;
use crate::config::{AccountConfig, Config};
pub fn generate_userdb(cfg: Config) {
for name in cfg.accounts.into_keys() {
println!("{}:::::::", name);
}
}
pub fn generate_static_passdb(cfg: Config) {
let system_accounts = cfg
.accounts
.into_iter()
.filter(|(_, acc)| acc.is_system_user);
for (name, _) in system_accounts {
println!("{}:::::::", name);
}
}
pub fn update_dynamic_passdb<P: AsRef<Path>>(cfg: Config, path: P) -> Result<(), Box<dyn Error>> {
// create hashmap of all accounts with their initial passdb-lines
let mut accounts: HashMap<String, AccountConfig> = cfg
.accounts
.into_iter()
.filter(|(_, acc)| !acc.is_system_user)
.collect();
eprintln!("settings: {:#?}", accounts);
// load current passdb and update account password hashes
if path.as_ref().exists() {
let re = Regex::new(r"^(?P<name>.*):(?P<hashed_password>.*)::::::$").unwrap();
let curr_passdb = fs::read_to_string(path.as_ref()).unwrap();
eprintln!("current passdb: {curr_passdb}");
for line in curr_passdb.lines() {
//let caps = re.captures(line).ok_or_else(panic!("Regex does not match").unwrap();
let caps = re
.captures(line)
.unwrap_or_else(|| panic!("Regex does not match line: {line}"));
accounts.entry(caps["name"].to_string()).and_modify(|e| {
e.hashed_password = caps["hashed_password"].to_string();
});
}
}
for (name, acc) in accounts.into_iter() {
println!("{}:{}::::::", name, acc.hashed_password);
}
Ok(())
}

33
pkgs/mailnix/src/main.rs Normal file
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@ -0,0 +1,33 @@
mod cli;
mod config;
mod dovecot;
mod postfix;
use crate::{
cli::{Cli, Commands},
config::Config,
};
use clap::Parser;
fn main() {
let args = Cli::parse();
let mut cfg = Config::load(args.config_path).unwrap();
if let Some(additional_cfg_path) = args.additional_config_path {
cfg.merge(additional_cfg_path).unwrap();
}
let cfg = cfg;
cfg.check().unwrap();
match &args.command {
Commands::Check => println!("Check: {:#?}", cfg),
Commands::GenerateUserdb => dovecot::generate_userdb(cfg),
Commands::GenerateStaticPassdb => dovecot::generate_static_passdb(cfg),
Commands::UpdateDynamicPassdb { path } => {
dovecot::update_dynamic_passdb(cfg, path).unwrap()
}
Commands::GenerateAliases => postfix::generate_aliases(cfg),
Commands::GenerateDeniedRecipients => postfix::generate_denied_recipients(cfg),
Commands::GenerateDomains => postfix::generate_domains(cfg),
}
}

View file

@ -0,0 +1,32 @@
use crate::config::Config;
fn prefix_domain(value: String) -> String {
if !value.contains("@") {
return format!("@{value}");
}
value
}
pub fn generate_aliases(cfg: Config) {
for name in cfg.accounts.into_keys() {
println!("{} {}", name, name);
}
for (src, dests) in cfg.aliases.into_iter() {
let dests: Vec<_> = dests.into_iter().map(prefix_domain).collect();
println!("{} {}", prefix_domain(src), dests.join(", "));
}
}
pub fn generate_denied_recipients(cfg: Config) {
let system_accounts = cfg
.accounts
.into_iter()
.filter(|(_, acc)| acc.is_system_user);
for (name, acc) in system_accounts {
println!("{} REJECT {}", name, acc.reject_message);
}
}
pub fn generate_domains(cfg: Config) {
println!("{}", cfg.domains.into_iter().collect::<Vec<_>>().join("\n"));
}