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Rewrite the project

Browse source 
The previous project architecture was far too complicated and hard to
maintain. The new one is much more simple. Although procedural macros
are cools, they are a no-go on Rust-OpenSMTPD.

Reports and filter are implemented (except data-line) but untested.
This commit is contained in:
Rodolphe Bréard 2020-11-25 18:04:16 +01:00
parent fc072743ad
commit a6d4dd21c1
48 changed files with 1723 additions and 1493 deletions
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28
Cargo.toml
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@ -1,5 +1,23 @@
[workspace] [package]
members = [ name = "opensmtpd"
"opensmtpd", version = "0.2.0"
"opensmtpd-derive" authors = ["Rodolphe Bréard <rodolphe@what.tf>"]
] edition = "2018"
description = "Interface for OpenSMTPD filters"
keywords = ["opensmtpd", "filter", "mail"]
documentation = "https://docs.rs/opensmtpd/"
repository = "https://github.com/breard-r/rust-opensmtpd"
readme = "README.md"
license = "MIT OR Apache-2.0"
include = ["src/**/*", "Cargo.toml", "LICENSE-*.txt"]
[dependencies]
log = "0.4"
nom = "6.0"
[dev-dependencies]
simplelog = "0.8"
[[example]]
name = "counter"
path = "examples/counter.rs"

0
opensmtpd-derive/LICENSE-APACHE-2.0.txt → LICENSE-APACHE-2.0.txt
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0
opensmtpd-derive/LICENSE-MIT.txt → LICENSE-MIT.txt
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45
examples/counter.rs Normal file
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@ -0,0 +1,45 @@
use log;
use opensmtpd::{register, run_filter, Address, Filter, ReportEntry};
use simplelog::{Config, LevelFilter, TermLogger, TerminalMode};
#[derive(Default)]
struct MyCounter {
nb_connected: u64,
nb_total: u64,
}
impl Filter for MyCounter {
register!(has_report_link_connect);
fn on_report_link_connect(
&mut self,
_entry: &ReportEntry,
_rdns: &str,
_fcrdns: &str,
_src: &Address,
_dest: &Address,
) {
self.nb_connected += 1;
self.nb_total += 1;
log::info!(
"New client (connected: {}, total: {})",
self.nb_connected,
self.nb_total
);
}
register!(has_report_link_disconnect);
fn on_report_link_disconnect(&mut self, _entry: &ReportEntry) {
self.nb_connected -= 1;
log::info!(
"Client left (connected: {}, total: {})",
self.nb_connected,
self.nb_total
);
}
}
fn main() {
TermLogger::init(LevelFilter::Debug, Config::default(), TerminalMode::Mixed).unwrap();
let mut my_counter: MyCounter = Default::default();
run_filter(&mut my_counter);
}

4
examples/samples/empty.log Normal file
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@ -0,0 +1,4 @@
config|smtpd-version|6.6.1
config|smtp-session-timeout|300
config|subsystem|smtp-in
config|ready

6
examples/samples/single_session.log Normal file
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@ -0,0 +1,6 @@
config|smtpd-version|6.6.1
config|smtp-session-timeout|300
config|subsystem|smtp-in
config|ready
report|0.5|1576146008.006099|smtp-in|link-connect|7641df9771b4ed00|mail.openbsd.org|pass|199.185.178.25:33174|45.77.67.80:25
report|0.5|1576147242.200225|smtp-in|link-disconnect|7641dfb3798eb5bf

19
opensmtpd-derive/Cargo.toml
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@ -1,19 +0,0 @@
[package]
name = "opensmtpd_derive"
version = "0.2.0"
authors = ["Rodolphe Bréard <rodolphe@what.tf>"]
edition = "2018"
description = "Interface for OpenSMTPD filters"
keywords = ["opensmtpd", "filter", "mail"]
documentation = "https://docs.rs/opensmtpd-derive/"
repository = "https://github.com/breard-r/rust-opensmtpd"
readme = "README.md"
license = "MIT OR Apache-2.0"
include = ["src/**/*", "Cargo.toml", "LICENSE-*.txt"]
[lib]
proc-macro = true
[dependencies]
quote = "1.0"
syn = { version = "1.0", features = ["full", "extra-traits"] }

113
opensmtpd-derive/src/attributes.rs
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@ -1,113 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use syn::parse::{Parse, ParseStream};
use syn::punctuated::Punctuated;
use syn::{parenthesized, Ident, Result, Token};
#[derive(Debug)]
pub(crate) struct OpenSmtpdAttributes {
version: Ident,
subsystem: Ident,
events: Punctuated<Ident, Token![,]>,
}
impl Parse for OpenSmtpdAttributes {
fn parse(input: ParseStream) -> Result<Self> {
let version = input.parse()?;
let _: Token![,] = input.parse()?;
let subsystem = input.parse()?;
let _: Token![,] = input.parse()?;
let _match: Token![match] = input.parse()?;
let content;
let _ = parenthesized!(content in input);
let events = content.parse_terminated(Ident::parse)?;
Ok(OpenSmtpdAttributes {
version,
subsystem,
events,
})
}
}
impl OpenSmtpdAttributes {
pub(crate) fn get_version(&self) -> String {
format!(
"opensmtpd::entry::Version::{}",
self.version.to_string().to_uppercase()
)
}
pub(crate) fn get_subsystem(&self) -> String {
let subsystem = match self.subsystem.to_string().as_str() {
"smtp_in" => "SmtpIn",
"smtp_out" => "SmtpOut",
_ => "",
};
format!("opensmtpd::entry::Subsystem::{}", subsystem)
}
pub(crate) fn get_events(&self) -> String {
let events = if self
.events
.iter()
.any(|e| e.to_string().to_lowercase().as_str() == "all")
{
let lst = [
"LinkAuth",
"LinkConnect",
"LinkDisconnect",
"LinkIdentify",
"LinkReset",
"LinkTls",
"TxBegin",
"TxMail",
"TxRcpt",
"TxEnvelope",
"TxData",
"TxCommit",
"TxRollback",
"ProtocolClient",
"ProtocolServer",
"FilterResponse",
"Timeout",
];
lst.iter()
.map(|e| format!("opensmtpd::entry::Event::{}", e))
.collect::<Vec<String>>()
} else {
self.events
.iter()
.map(|e| {
let name = match e.to_string().as_str() {
"link_auth" => "LinkAuth",
"link_connect" => "LinkConnect",
"link_disconnect" => "LinkDisconnect",
"link_identify" => "LinkIdentify",
"link_reset" => "LinkReset",
"link_tls" => "LinkTls",
"tx_begin" => "TxBegin",
"tx_mail" => "TxMail",
"tx_rcpt" => "TxRcpt",
"tx_envelope" => "TxEnvelope",
"tx_data" => "TxData",
"tx_commit" => "TxCommit",
"tx_rollback" => "TxRollback",
"protocol_client" => "ProtocolClient",
"protocol_server" => "ProtocolServer",
"filter_response" => "FilterResponse",
"timeout" => "Timeout",
_ => "",
};
format!("opensmtpd::entry::Event::{}", name)
})
.collect::<Vec<String>>()
};
format!("[{}]", events.join(", "))
}
}

115
opensmtpd-derive/src/lib.rs
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@ -1,115 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate proc_macro;
mod attributes;
use attributes::OpenSmtpdAttributes;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, ExprArray, ExprTry, ItemFn, ReturnType, TypePath};
macro_rules! parse_item {
($item: expr, $type: ty) => {
match syn::parse_str::<$type>($item) {
Ok(i) => i,
Err(e) => {
return TokenStream::from(e.to_compile_error());
}
}
};
}
fn get_has_result(ret: &ReturnType) -> bool {
match ret {
ReturnType::Default => false,
ReturnType::Type(_, _) => true,
}
}
fn get_inner_call(nb_args: usize, has_output: bool, has_result: bool) -> String {
let mut call_params = Vec::new();
if has_output {
call_params.push("_output");
}
call_params.push("_entry");
if nb_args >= 2 {
call_params.push("_filter_ctx");
}
if nb_args >= 3 {
call_params.push("_session_ctx");
}
let call_params = call_params.join(", ");
let s = format!("inner_fn({})", &call_params);
if has_result {
return format!("{}?", s);
}
format!(
"(|{params}| -> Result<(), String> {{ {inner_fn}; Ok(()) }})({params})?",
params = &call_params,
inner_fn = s
)
}
fn get_tokenstream(
attr: TokenStream,
input: TokenStream,
type_str: &str,
has_output: bool,
) -> TokenStream {
let kind = parse_item!(type_str, TypePath);
// Parse the procedural macro attributes
let attr = parse_macro_input!(attr as OpenSmtpdAttributes);
let version = parse_item!(&attr.get_version(), TypePath);
let subsystem = parse_item!(&attr.get_subsystem(), TypePath);
let events = parse_item!(&attr.get_events(), ExprArray);
// Parse the user-supplied function
let item = parse_macro_input!(input as ItemFn);
let fn_name = &item.sig.ident;
let fn_params = &item.sig.inputs;
let fn_return = &item.sig.output;
let fn_body = &item.block;
let has_result = get_has_result(&item.sig.output);
let inner_call = parse_item!(
&get_inner_call(fn_params.len(), has_output, has_result),
ExprTry
);
// Build the new function
let output = quote! {
fn #fn_name() -> opensmtpd::Handler::<OpenSmtpdSessionContextType, OpenSmtpdFilterContextType> {
opensmtpd::Handler::new(
#version,
#kind,
#subsystem,
&#events,
|_output: &mut dyn opensmtpd::output::FilterOutput, _entry: &opensmtpd::entry::Entry, _session_ctx: &mut OpenSmtpdSessionContextType, _filter_ctx: &mut OpenSmtpdFilterContextType| {
let inner_fn = |#fn_params| #fn_return {
#fn_body
};
let _ = #inner_call;
Ok(())
},
)
}
};
output.into()
}
#[proc_macro_attribute]
pub fn report(attr: TokenStream, input: TokenStream) -> TokenStream {
get_tokenstream(attr, input, "opensmtpd::entry::Kind::Report", false)
}
#[proc_macro_attribute]
pub fn filter(attr: TokenStream, input: TokenStream) -> TokenStream {
get_tokenstream(attr, input, "opensmtpd::entry::Kind::Filter", true)
}

29
opensmtpd/Cargo.toml
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@ -1,29 +0,0 @@
[package]
name = "opensmtpd"
version = "0.2.0"
authors = ["Rodolphe Bréard <rodolphe@what.tf>"]
edition = "2018"
description = "Interface for OpenSMTPD filters"
keywords = ["opensmtpd", "filter", "mail"]
documentation = "https://docs.rs/opensmtpd/"
repository = "https://github.com/breard-r/rust-opensmtpd"
readme = "README.md"
license = "MIT OR Apache-2.0"
include = ["src/**/*", "Cargo.toml", "LICENSE-*.txt"]
[dependencies]
log = {version = "0.4", features = ["std"]}
nom = "6.0"
opensmtpd_derive = { path = "../opensmtpd-derive", version = "0.2" }
[[example]]
name = "hello"
path = "examples/hello.rs"
[[example]]
name = "echo"
path = "examples/echo.rs"
[[example]]
name = "counter"
path = "examples/report_counter.rs"

202
opensmtpd/LICENSE-APACHE-2.0.txt
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@ -1,202 +0,0 @@
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7
opensmtpd/LICENSE-MIT.txt
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@ -1,7 +0,0 @@
Copyright 2019 Rodolphe Bréard
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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13
opensmtpd/examples/echo.rs
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@ -1,13 +0,0 @@
use opensmtpd::entry::Entry;
use opensmtpd::{register_no_context, report, simple_filter};
register_no_context!();
#[report(v1, smtp_in, match(all))]
fn echo(entry: &Entry) {
log::info!("New entry: {:?}", entry);
}
fn main() {
simple_filter!([echo]);
}

13
opensmtpd/examples/hello.rs
View file

@ -1,13 +0,0 @@
use opensmtpd::entry::Entry;
use opensmtpd::{register_no_context, report, simple_filter};
register_no_context!();
#[report(v1, smtp_in, match(link_connect))]
fn hello(entry: &Entry) {
log::info!("Hello {}!", entry.get_session_id());
}
fn main() {
simple_filter!([hello]);
}

26
opensmtpd/examples/report_counter.rs
View file

@ -1,26 +0,0 @@
use log;
use opensmtpd::entry::Entry;
use opensmtpd::{register_contexts, report, simple_filter};
#[derive(Clone, Default)]
struct MyCounter {
nb: usize,
}
register_contexts!(MyCounter, MyCounter);
#[report(v1, smtp_in, match(all))]
fn on_report(entry: &Entry, total: &mut MyCounter, session: &mut MyCounter) {
total.nb += 1;
session.nb += 1;
log::info!(
"Event received for session {}: {} (total: {})",
entry.get_session_id(),
session.nb,
total.nb
);
}
fn main() {
simple_filter!(MyCounter, MyCounter, [on_report]);
}

10
opensmtpd/examples/samples/dual_session.txt
View file

@ -1,10 +0,0 @@
report|1|1546681202.276920|smtp-in|link-connect|dbd829906c50e764|localhost|pass|127.0.0.1:34818|127.0.0.1:25
report|1|1546681202.277715|smtp-in|filter-response|dbd829906c50e764|connected|proceed
report|1|1546681202.276920|smtp-in|link-connect|4b0148c60f798628|localhost|pass|127.0.0.1:34818|127.0.0.1:25
report|1|1546681202.277715|smtp-in|filter-response|4b0148c60f798628|connected|proceed
report|1|1546681202.277761|smtp-in|protocol-server|dbd829906c50e764|220 laptop.home ESMTP OpenSMTPD
report|1|1546681232.283049|smtp-in|timeout|dbd829906c50e764
report|1|1546681202.277761|smtp-in|protocol-server|4b0148c60f798628|220 laptop.home ESMTP OpenSMTPD
report|1|1546681232.283049|smtp-in|timeout|4b0148c60f798628
report|1|1546681232.283083|smtp-in|link-disconnect|dbd829906c50e764
report|1|1546681232.283083|smtp-in|link-disconnect|4b0148c60f798628

29
opensmtpd/examples/samples/single_events_session.txt
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@ -1,29 +0,0 @@
report|1|1562870145.607116|smtp-in|link-connect|4c8aad137c3de7cb|localhost|pass|127.0.0.1:21438|127.0.0.1:25
report|1|1562870145.607395|smtp-in|filter-response|4c8aad137c3de7cb|connected|proceed
report|1|1562870145.607402|smtp-in|protocol-server|4c8aad137c3de7cb|220 mx.example.org ESMTP OpenSMTPD
report|1|1562870149.811367|smtp-in|protocol-client|4c8aad137c3de7cb|HELO localhost
report|1|1562870149.813732|smtp-in|filter-response|4c8aad137c3de7cb|helo|proceed
report|1|1562870149.813744|smtp-in|link-identify|4c8aad137c3de7cb|localhost
report|1|1562870149.813763|smtp-in|protocol-server|4c8aad137c3de7cb|250 mx.example.org Hello localhost [127.0.0.1], pleased to meet you
report|1|1562870154.283507|smtp-in|protocol-client|4c8aad137c3de7cb|MAIL FROM:<derp@toto.example.com>
report|1|1562870154.286255|smtp-in|filter-response|4c8aad137c3de7cb|mail-from|proceed
report|1|1562870154.288148|smtp-in|tx-begin|4c8aad137c3de7cb|20ec19f5
report|1|1562870154.288165|smtp-in|tx-mail|4c8aad137c3de7cb|20ec19f5|<derp@toto.example.com>|ok
report|1|1562870154.288181|smtp-in|protocol-server|4c8aad137c3de7cb|250 2.0.0: Ok
report|1|1562870159.284269|smtp-in|protocol-client|4c8aad137c3de7cb|RCPT TO:<elsa@localhost>
report|1|1562870159.286969|smtp-in|filter-response|4c8aad137c3de7cb|rcpt-to|proceed
report|1|1562870159.291856|smtp-in|tx-envelope|4c8aad137c3de7cb|20ec19f5|20ec19f543927eb5
report|1|1562870159.291907|smtp-in|tx-rcpt|4c8aad137c3de7cb|20ec19f5|<elsa@localhost>|ok
report|1|1562870159.291925|smtp-in|protocol-server|4c8aad137c3de7cb|250 2.1.5 Destination address valid: Recipient ok
report|1|1562870163.451339|smtp-in|protocol-client|4c8aad137c3de7cb|DATA
report|1|1562870163.453789|smtp-in|filter-response|4c8aad137c3de7cb|data|proceed
report|1|1562870163.455790|smtp-in|tx-data|4c8aad137c3de7cb|20ec19f5|ok
report|1|1562870163.455811|smtp-in|protocol-server|4c8aad137c3de7cb|354 Enter mail, end with "." on a line by itself
report|1|1562870224.765630|smtp-in|protocol-client|4c8aad137c3de7cb|.
report|1|1562870224.767139|smtp-in|filter-response|4c8aad137c3de7cb|commit|proceed
report|1|1562870224.767275|smtp-in|tx-commit|4c8aad137c3de7cb|20ec19f5|562
report|1|1562870224.770499|smtp-in|protocol-server|4c8aad137c3de7cb|250 2.0.0: 20ec19f5 Message accepted for delivery
report|1|1562870229.128193|smtp-in|protocol-client|4c8aad137c3de7cb|QUIT
report|1|1562870229.130522|smtp-in|filter-response|4c8aad137c3de7cb|quit|proceed
report|1|1562870229.130547|smtp-in|protocol-server|4c8aad137c3de7cb|221 2.0.0: Bye
report|1|1562870229.131314|smtp-in|link-disconnect|4c8aad137c3de7cb

5
opensmtpd/examples/samples/single_session.txt
View file

@ -1,5 +0,0 @@
report|1|1546681202.276920|smtp-in|link-connect|dbd829906c50e764|localhost|pass|127.0.0.1:34818|127.0.0.1:25
report|1|1546681202.277715|smtp-in|filter-response|dbd829906c50e764|connected|proceed
report|1|1546681202.277761|smtp-in|protocol-server|dbd829906c50e764|220 laptop.home ESMTP OpenSMTPD
report|1|1546681232.283049|smtp-in|timeout|dbd829906c50e764
report|1|1546681232.283083|smtp-in|link-disconnect|dbd829906c50e764

298
opensmtpd/src/entry.rs
View file

@ -1,298 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::errors::Error;
use nom::branch::alt;
use nom::bytes::streaming::{tag, take_till};
use nom::character::streaming::{digit1, hex_digit1, line_ending};
use nom::combinator::{map_res, value};
use nom::multi::many0;
use nom::Err::Incomplete;
use nom::IResult;
use std::str::FromStr;
pub type SessionId = u64;
pub type Token = u64;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Version {
V1,
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Kind {
Report,
Filter,
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Subsystem {
SmtpIn,
SmtpOut,
}
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub enum Event {
LinkAuth,
LinkConnect,
LinkDisconnect,
LinkIdentify,
LinkReset,
LinkTls,
TxBegin,
TxMail,
TxRcpt,
TxEnvelope,
TxData,
TxCommit,
TxRollback,
ProtocolClient,
ProtocolServer,
FilterResponse,
Timeout,
}
impl FromStr for Event {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s = s.to_lowercase();
let s = if !s.contains('-') {
s.replace("link", "link-")
.replace("tx", "tx-")
.replace("protocol", "protocol-")
.replace("filter", "filter-")
} else {
s
};
let (_, evt) = parse_event(&s)?;
Ok(evt)
}
}
impl ToString for Event {
fn to_string(&self) -> String {
let s = match self {
Event::LinkAuth => "link-auth",
Event::LinkConnect => "link-connect",
Event::LinkDisconnect => "link-disconnect",
Event::LinkIdentify => "link-identify",
Event::LinkReset => "link-reset",
Event::LinkTls => "link-tls",
Event::TxBegin => "tx-begin",
Event::TxMail => "tx-mail",
Event::TxRcpt => "tx-rcpt",
Event::TxEnvelope => "tx-envelope",
Event::TxData => "tx-data",
Event::TxCommit => "tx-commit",
Event::TxRollback => "tx-rollback",
Event::ProtocolClient => "protocol-client",
Event::ProtocolServer => "protocol-server",
Event::FilterResponse => "filter-response",
Event::Timeout => "timeout",
};
String::from(s)
}
}
#[derive(Debug)]
pub struct TimeVal {
pub sec: i64,
pub usec: i64,
}
impl ToString for TimeVal {
fn to_string(&self) -> String {
format!("{}.{}", self.sec, self.usec)
}
}
#[derive(Debug)]
pub enum Entry {
V1Report(V1Report),
V1Filter(V1Filter),
}
impl Entry {
pub fn new(entry: &str) -> Result<(String, Option<Self>), Error> {
match parse_entry(entry) {
Ok((remainder, entry)) => Ok((remainder.to_string(), Some(entry))),
Err(e) => match e {
Incomplete(_) => Ok((String::new(), None)),
_ => Err(e.into()),
},
}
}
pub fn get_event(&self) -> Event {
match self {
Entry::V1Report(r) => r.event.to_owned(),
Entry::V1Filter(f) => f.event.to_owned(),
}
}
pub fn get_session_id(&self) -> SessionId {
match self {
Entry::V1Report(r) => r.session_id,
Entry::V1Filter(f) => f.session_id,
}
}
pub fn is_disconnect(&self) -> bool {
match self {
Entry::V1Report(r) => r.event == Event::LinkDisconnect,
Entry::V1Filter(_) => false,
}
}
}
#[derive(Debug)]
pub struct V1Report {
pub timestamp: TimeVal,
pub subsystem: Subsystem,
pub event: Event,
pub session_id: SessionId,
pub params: Vec<String>,
}
#[derive(Debug)]
pub struct V1Filter {
pub timestamp: TimeVal,
pub subsystem: Subsystem,
pub event: Event,
pub session_id: SessionId,
pub token: Token,
pub params: Vec<String>,
}
fn separator(input: &str) -> IResult<&str, &str> {
tag("|")(input)
}
fn parse_kind(input: &str) -> IResult<&str, Kind> {
alt((
value(Kind::Report, tag("report")),
value(Kind::Filter, tag("filter")),
))(input)
}
fn parse_version(input: &str) -> IResult<&str, Version> {
value(Version::V1, tag("1"))(input)
}
fn parse_timestamp(input: &str) -> IResult<&str, TimeVal> {
let (input, sec) = map_res(digit1, |s: &str| s.parse::<i64>())(input)?;
let (input, _) = tag(".")(input)?;
let (input, usec) = map_res(digit1, |s: &str| s.parse::<i64>())(input)?;
let timestamp = TimeVal { sec, usec };
Ok((input, timestamp))
}
fn parse_subsystem(input: &str) -> IResult<&str, Subsystem> {
alt((
value(Subsystem::SmtpIn, tag("smtp-in")),
value(Subsystem::SmtpOut, tag("smtp-out")),
))(input)
}
fn parse_event(input: &str) -> IResult<&str, Event> {
alt((
value(Event::LinkAuth, tag("link-auth")),
value(Event::LinkConnect, tag("link-connect")),
value(Event::LinkDisconnect, tag("link-disconnect")),
value(Event::LinkIdentify, tag("link-identify")),
value(Event::LinkReset, tag("link-reset")),
value(Event::LinkTls, tag("link-tls")),
value(Event::TxBegin, tag("tx-begin")),
value(Event::TxMail, tag("tx-mail")),
value(Event::TxRcpt, tag("tx-rcpt")),
value(Event::TxEnvelope, tag("tx-envelope")),
value(Event::TxData, tag("tx-data")),
value(Event::TxCommit, tag("tx-commit")),
value(Event::TxRollback, tag("tx-rollback")),
value(Event::ProtocolClient, tag("protocol-client")),
value(Event::ProtocolServer, tag("protocol-server")),
value(Event::FilterResponse, tag("filter-response")),
value(Event::Timeout, tag("timeout")),
))(input)
}
fn parse_token(input: &str) -> IResult<&str, Token> {
map_res(hex_digit1, |s: &str| Token::from_str_radix(s, 16))(input)
}
fn parse_session_id(input: &str) -> IResult<&str, SessionId> {
map_res(hex_digit1, |s: &str| SessionId::from_str_radix(s, 16))(input)
}
fn parse_param(input: &str) -> IResult<&str, String> {
let (input, _) = separator(input)?;
let (input, param) = take_till(is_end_param)(input)?;
Ok((input, param.to_string()))
}
fn is_end_param(c: char) -> bool {
c == '|' || c == '\r' || c == '\n'
}
fn parse_v1_report(input: &str) -> IResult<&str, Entry> {
let (input, timestamp) = parse_timestamp(input)?;
let (input, _) = separator(input)?;
let (input, subsystem) = parse_subsystem(input)?;
let (input, _) = separator(input)?;
let (input, event) = parse_event(input)?;
let (input, _) = separator(input)?;
let (input, session_id) = parse_session_id(input)?;
let (input, params) = many0(parse_param)(input)?;
let (input, _) = line_ending(input)?;
let report = V1Report {
timestamp,
subsystem,
event,
session_id,
params,
};
Ok((input, Entry::V1Report(report)))
}
fn parse_v1_filter(input: &str) -> IResult<&str, Entry> {
let (input, timestamp) = parse_timestamp(input)?;
let (input, _) = separator(input)?;
let (input, subsystem) = parse_subsystem(input)?;
let (input, _) = separator(input)?;
let (input, event) = parse_event(input)?;
let (input, _) = separator(input)?;
let (input, session_id) = parse_session_id(input)?;
let (input, _) = separator(input)?;
let (input, token) = parse_token(input)?;
let (input, params) = many0(parse_param)(input)?;
let (input, _) = line_ending(input)?;
let filter = V1Filter {
timestamp,
subsystem,
event,
session_id,
token,
params,
};
Ok((input, Entry::V1Filter(filter)))
}
fn parse_entry(input: &str) -> IResult<&str, Entry> {
let (input, kind) = parse_kind(input)?;
let (input, _) = separator(input)?;
let (input, version) = parse_version(input)?;
let (input, _) = separator(input)?;
let (input, entry) = match version {
Version::V1 => match kind {
Kind::Report => parse_v1_report(input)?,
Kind::Filter => parse_v1_filter(input)?,
},
};
Ok((input, entry))
}

62
opensmtpd/src/errors.rs
View file

@ -1,62 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fmt;
pub struct Error {
message: String,
}
impl Error {
pub fn new(msg: &str) -> Self {
Error {
message: msg.to_string(),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.message)
}
}
impl From<std::io::Error> for Error {
fn from(error: std::io::Error) -> Self {
Error::new(&format!("IO error: {}", error))
}
}
impl From<std::string::String> for Error {
fn from(error: std::string::String) -> Self {
Error { message: error }
}
}
impl From<std::str::Utf8Error> for Error {
fn from(error: std::str::Utf8Error) -> Self {
Error::new(&format!("UTF8 error: {}", error))
}
}
impl From<log::SetLoggerError> for Error {
fn from(error: log::SetLoggerError) -> Self {
Error::new(&format!("Logger error: {}", error))
}
}
impl From<nom::Err<(&str, nom::error::ErrorKind)>> for Error {
fn from(error: nom::Err<(&str, nom::error::ErrorKind)>) -> Self {
let msg = match error {
nom::Err::Incomplete(_) => "not enough data".to_string(),
nom::Err::Error(c) => format!("{:?}", c),
nom::Err::Failure(c) => format!("{:?}", c),
};
Error::new(&format!("Parsing error: {}", msg))
}
}

85
opensmtpd/src/handler.rs
View file

@ -1,85 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::entry::{Entry, Event, Kind, Subsystem, Version};
use crate::errors::Error;
use crate::output::FilterOutput;
use std::collections::HashSet;
macro_rules! handle {
($self: ident, $obj: ident, $version: expr, $kind: expr, $entry: ident, $output: ident, $session_ctx: ident, $filter_ctx: ident) => {{
if $self.version == $version
&& $self.kind == $kind
&& $self.subsystem == $obj.subsystem
&& $self.events.contains(&$obj.event)
{
($self.action)($output, $entry, $session_ctx, $filter_ctx)?;
}
Ok(())
}};
}
type Callback<S, F> = fn(&mut dyn FilterOutput, &Entry, &mut S, &mut F) -> Result<(), String>;
#[derive(Clone)]
pub struct Handler<S, F> {
version: Version,
pub(crate) kind: Kind,
pub(crate) subsystem: Subsystem,
pub(crate) events: HashSet<Event>,
action: Callback<S, F>,
}
impl<S, F> Handler<S, F> {
pub fn new(
version: Version,
kind: Kind,
subsystem: Subsystem,
events: &[Event],
action: Callback<S, F>,
) -> Self {
Handler {
version,
kind,
subsystem,
events: events.iter().cloned().collect(),
action,
}
}
pub fn send(
&self,
entry: &Entry,
output: &mut dyn FilterOutput,
session_ctx: &mut S,
filter_ctx: &mut F,
) -> Result<(), Error> {
match entry {
Entry::V1Report(report) => handle!(
self,
report,
Version::V1,
Kind::Report,
entry,
output,
session_ctx,
filter_ctx
),
Entry::V1Filter(filter) => handle!(
self,
filter,
Version::V1,
Kind::Filter,
entry,
output,
session_ctx,
filter_ctx
),
}
}
}

17
opensmtpd/src/input.rs
View file

@ -1,17 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::entry::Entry;
use crate::errors::Error;
pub trait FilterInput {
fn next(&mut self) -> Result<Entry, Error>;
}
mod stdin;
pub use stdin::StdIn;

78
opensmtpd/src/input/stdin.rs
View file

@ -1,78 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::entry::Entry;
use crate::errors::Error;
use crate::input::FilterInput;
use std::default::Default;
use std::io::{self, ErrorKind, Read};
use std::str;
const BUFFER_SIZE: usize = 4096;
pub struct StdIn {
buffer: [u8; BUFFER_SIZE],
stdin: io::Stdin,
input: String,
}
impl Default for StdIn {
fn default() -> Self {
StdIn {
buffer: [0; BUFFER_SIZE],
stdin: io::stdin(),
input: String::new(),
}
}
}
impl FilterInput for StdIn {
fn next(&mut self) -> Result<Entry, Error> {
let mut force_read = false;
loop {
if force_read || self.input.is_empty() {
// Reset the flag
force_read = false;
// Read stdin in self.buffer
self.buffer.copy_from_slice(&[0; BUFFER_SIZE]);
let len = match self.stdin.read(&mut self.buffer) {
Ok(n) => n,
Err(e) => match e.kind() {
ErrorKind::Interrupted => {
continue;
}
_ => {
return Err(e.into());
}
},
};
if len == 0 {
return Err(Error::new("Unable to read on stdin."));
}
// Put the buffer's content in self.input
self.input += match self.buffer.iter().position(|&x| x == 0) {
Some(i) => str::from_utf8(&self.buffer[..i]),
None => str::from_utf8(&self.buffer),
}?;
}
// Try to build an entry from self.input
let (remainder, entry_opt) = Entry::new(&self.input)?;
match entry_opt {
// We have at least one entry.
Some(entry) => {
self.input = remainder;
return Ok(entry);
}
// The data is incomplete, no entry could be built.
None => {
force_read = true;
}
};
}
}
}

234
opensmtpd/src/lib.rs
View file

@ -1,234 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
mod errors;
mod handler;
mod logger;
pub mod entry;
pub mod input;
pub mod output;
use crate::entry::{Kind, SessionId, Subsystem};
use log;
use std::collections::{HashMap, HashSet};
use std::default::Default;
pub use crate::errors::Error;
pub use crate::handler::Handler;
pub use crate::logger::SmtpdLogger;
pub use opensmtpd_derive::report;
#[macro_export]
macro_rules! register_contexts {
($context: ty) => {
opensmtpd::register_contexts!($context, $context);
};
($session_context: ty, $filter_context: ty) => {
type OpenSmtpdFilterContextType = $filter_context;
type OpenSmtpdSessionContextType = $session_context;
};
}
#[macro_export]
macro_rules! register_filter_context_only {
($context: ty) => {
type OpenSmtpdFilterContextType = $context;
type OpenSmtpdSessionContextType = opensmtpd::NoContext;
};
}
#[macro_export]
macro_rules! register_session_context_only {
($context: ty) => {
type OpenSmtpdFilterContextType = opensmtpd::NoContext;
type OpenSmtpdSessionContextType = $context;
};
}
#[macro_export]
macro_rules! register_no_context {
() => {
type OpenSmtpdFilterContextType = opensmtpd::NoContext;
type OpenSmtpdSessionContextType = opensmtpd::NoContext;
};
}
#[macro_export]
macro_rules! simple_filter {
($handlers: expr) => {
opensmtpd::simple_filter!(
log::Level::Info,
opensmtpd::NoContext,
opensmtpd::NoContext,
$handlers
);
};
($filter_ctx: ty, $handlers: expr) => {
opensmtpd::simple_filter!(
log::Level::Info,
opensmtpd::NoContext,
$filter_ctx,
$handlers
);
};
($sesion_ctx: ty, $filter_ctx: ty, $handlers: expr) => {
opensmtpd::simple_filter!(log::Level::Info, $sesion_ctx, $filter_ctx, $handlers);
};
($log_level: path, $sesion_ctx: ty, $filter_ctx: ty, $handlers: expr) => {
let handlers = ($handlers)
.iter()
.map(|f| f())
.collect::<Vec<opensmtpd::Handler<$sesion_ctx, $filter_ctx>>>();
let _ = opensmtpd::SmtpdLogger::new().set_level($log_level).init();
opensmtpd::Filter::<
opensmtpd::input::StdIn,
opensmtpd::output::StdOut,
$sesion_ctx,
$filter_ctx,
>::default()
.set_handlers(handlers.as_slice())
.register_events()
.run();
};
}
macro_rules! fatal_error {
($error: ident) => {
log::error!("Error: {}", $error);
std::process::exit(1);
};
}
macro_rules! insert_events {
($handler: ident, $set: ident) => {{
for e in $handler.events.iter() {
$set.insert(e);
}
}};
}
macro_rules! register_events {
($output: expr, $set: ident, $kind: expr, $subsystem: expr) => {
for e in $set.iter() {
let msg = format!("register|{}|{}|{}", $kind, $subsystem, e.to_string());
if let Err(e) = $output.send(&msg) {
fatal_error!(e);
};
}
};
}
#[derive(Clone, Default)]
pub struct NoContext;
pub struct Filter<I, O, S, F>
where
I: crate::input::FilterInput + Default,
O: crate::output::FilterOutput + Default,
S: Default,
F: Default,
{
input: I,
output: O,
session_ctx: HashMap<SessionId, S>,
filter_ctx: F,
handlers: Vec<Handler<S, F>>,
}
impl<I, O, S, F> Default for Filter<I, O, S, F>
where
I: crate::input::FilterInput + Default,
O: crate::output::FilterOutput + Default,
S: Default,
F: Default,
{
fn default() -> Self {
Filter {
input: I::default(),
output: O::default(),
session_ctx: HashMap::new(),
filter_ctx: F::default(),
handlers: Vec::new(),
}
}
}
impl<I, O, S, F> Filter<I, O, S, F>
where
I: crate::input::FilterInput + Default,
O: crate::output::FilterOutput + Default,
S: Clone + Default,
F: Clone + Default,
{
pub fn set_handlers(&mut self, handlers: &[Handler<S, F>]) -> &mut Self {
self.handlers = handlers.to_vec();
self
}
pub fn register_events(&mut self) -> &mut Self {
let mut report_smtp_in = HashSet::new();
let mut report_smtp_out = HashSet::new();
let mut filter_smtp_in = HashSet::new();
let mut filter_smtp_out = HashSet::new();
for h in self.handlers.iter() {
match h.kind {
Kind::Report => match h.subsystem {
Subsystem::SmtpIn => insert_events!(h, report_smtp_in),
Subsystem::SmtpOut => insert_events!(h, report_smtp_out),
},
Kind::Filter => match h.subsystem {
Subsystem::SmtpIn => insert_events!(h, filter_smtp_in),
Subsystem::SmtpOut => insert_events!(h, filter_smtp_out),
},
};
}
register_events!(self.output, report_smtp_in, "report", "smtp-in");
register_events!(self.output, report_smtp_out, "report", "smtp-out");
register_events!(self.output, filter_smtp_in, "filter", "smtp-in");
register_events!(self.output, filter_smtp_out, "filter", "smtp-out");
self
}
pub fn run(&mut self) {
loop {
match self.input.next() {
Ok(entry) => {
log::debug!("{:?}", entry);
let session_id = entry.get_session_id();
let mut session_ctx = match self.session_ctx.get_mut(&session_id) {
Some(c) => c,
None => {
self.session_ctx.insert(session_id, S::default());
self.session_ctx.get_mut(&session_id).unwrap()
}
};
for h in self.handlers.iter() {
match h.send(
&entry,
&mut self.output,
&mut session_ctx,
&mut self.filter_ctx,
) {
Ok(_) => {}
Err(e) => {
log::warn!("Warning: {}", e);
}
};
}
if entry.is_disconnect() {
self.session_ctx.remove(&session_id);
}
}
Err(e) => {
fatal_error!(e);
}
};
}
}
}

56
opensmtpd/src/logger.rs
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@ -1,56 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::errors::Error;
use log::{Level, Metadata, Record};
use std::io::{self, Write};
#[derive(Clone)]
pub struct SmtpdLogger {
level: Level,
}
impl SmtpdLogger {
pub fn new() -> Self {
SmtpdLogger::default()
}
pub fn set_level(&mut self, level: Level) -> Self {
self.level = level;
self.clone()
}
pub fn init(self) -> Result<(), Error> {
let level = self.level.to_level_filter();
log::set_boxed_logger(Box::new(self))?;
log::set_max_level(level);
Ok(())
}
}
impl Default for SmtpdLogger {
fn default() -> Self {
SmtpdLogger { level: Level::Warn }
}
}
impl log::Log for SmtpdLogger {
fn enabled(&self, metadata: &Metadata) -> bool {
metadata.level() <= self.level
}
fn log(&self, record: &Record) {
if self.enabled(record.metadata()) {
let stderr = io::stderr();
let mut handle = stderr.lock();
writeln!(handle, "{}: {}", record.level(), record.args()).unwrap();
}
}
fn flush(&self) {}
}

19
opensmtpd/src/output.rs
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@ -1,19 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::errors::Error;
pub trait FilterOutput {
fn send(&mut self, msg: &str) -> Result<(), Error>;
}
mod null;
mod stdout;
pub use null::NullOutput;
pub use stdout::{StdErr, StdOut};

25
opensmtpd/src/output/null.rs
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@ -1,25 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::errors::Error;
use crate::output::FilterOutput;
use std::default::Default;
pub struct NullOutput {}
impl Default for NullOutput {
fn default() -> Self {
NullOutput {}
}
}
impl FilterOutput for NullOutput {
fn send(&mut self, _msg: &str) -> Result<(), Error> {
Ok(())
}
}

33
opensmtpd/src/output/stdout.rs
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@ -1,33 +0,0 @@
// Copyright (c) 2019 Rodolphe Bréard
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use crate::errors::Error;
use crate::output::FilterOutput;
use std::default::Default;
macro_rules! new_stdout {
($name: ident, $out: ident) => {
pub struct $name {}
impl Default for $name {
fn default() -> Self {
$name {}
}
}
impl FilterOutput for $name {
fn send(&mut self, msg: &str) -> Result<(), Error> {
$out!("{}", msg);
Ok(())
}
}
};
}
new_stdout!(StdOut, println);
new_stdout!(StdErr, eprintln);

20
src/data_structures/address.rs Normal file
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@ -0,0 +1,20 @@
use std::net::SocketAddr;
use std::path::PathBuf;
#[derive(Debug)]
pub enum Address {
Ip(SocketAddr),
UnixSocket(PathBuf),
}
impl ToString for Address {
fn to_string(&self) -> String {
match self {
Address::Ip(a) => a.to_string(),
Address::UnixSocket(a) => match a.clone().into_os_string().into_string() {
Ok(s) => s,
Err(_) => String::new(),
},
}
}
}

31
src/data_structures/auth_result.rs Normal file
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@ -0,0 +1,31 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum AuthResult {
Pass,
Fail,
Error,
}
impl ToString for AuthResult {
fn to_string(&self) -> String {
match self {
AuthResult::Pass => String::from("pass"),
AuthResult::Fail => String::from("fail"),
AuthResult::Error => String::from("error"),
}
}
}
impl FromStr for AuthResult {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"pass" => Ok(AuthResult::Pass),
"fail" => Ok(AuthResult::Fail),
"error" => Ok(AuthResult::Error),
_ => Err(()),
}
}
}

79
src/data_structures/event.rs Normal file
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use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Event {
LinkAuth,
LinkConnect,
LinkDisconnect,
LinkGreeting,
LinkIdentify,
LinkTls,
TxBegin,
TxMail,
TxReset,
TxRcpt,
TxEnvelope,
TxData,
TxCommit,
TxRollback,
ProtocolClient,
ProtocolServer,
FilterResponse,
FilterReport,
Timeout,
}
impl ToString for Event {
fn to_string(&self) -> String {
match self {
Event::LinkAuth => String::from("link-auth"),
Event::LinkConnect => String::from("link-connect"),
Event::LinkDisconnect => String::from("link-disconnect"),
Event::LinkGreeting => String::from("link-greeting"),
Event::LinkIdentify => String::from("link-identify"),
Event::LinkTls => String::from("link-tls"),
Event::TxBegin => String::from("tx-begin"),
Event::TxMail => String::from("tx-mail"),
Event::TxReset => String::from("tx-reset"),
Event::TxRcpt => String::from("tx-rcpt"),
Event::TxEnvelope => String::from("tx-envelope"),
Event::TxData => String::from("tx-data"),
Event::TxCommit => String::from("tx-commit"),
Event::TxRollback => String::from("tx-rollback"),
Event::ProtocolClient => String::from("protocol-client"),
Event::ProtocolServer => String::from("protocol-server"),
Event::FilterResponse => String::from("filter-response"),
Event::FilterReport => String::from("filter-report"),
Event::Timeout => String::from("timeout"),
}
}
}
impl FromStr for Event {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"link-auth" => Ok(Event::LinkAuth),
"link-connect" => Ok(Event::LinkConnect),
"link-disconnect" => Ok(Event::LinkDisconnect),
"link-greeting" => Ok(Event::LinkGreeting),
"link-identify" => Ok(Event::LinkIdentify),
"link-tls" => Ok(Event::LinkTls),
"tx-begin" => Ok(Event::TxBegin),
"tx-mail" => Ok(Event::TxMail),
"tx-reset" => Ok(Event::TxReset),
"tx-rcpt" => Ok(Event::TxRcpt),
"tx-envelope" => Ok(Event::TxEnvelope),
"tx-data" => Ok(Event::TxData),
"tx-commit" => Ok(Event::TxCommit),
"tx-rollback" => Ok(Event::TxRollback),
"protocol-client" => Ok(Event::ProtocolClient),
"protocol-server" => Ok(Event::ProtocolServer),
"filter-response" => Ok(Event::FilterResponse),
"filter-report" => Ok(Event::FilterReport),
"timeout" => Ok(Event::Timeout),
_ => Err(()),
}
}
}

28
src/data_structures/filter_kind.rs Normal file
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@ -0,0 +1,28 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum FilterKind {
Builtin,
Proc,
}
impl ToString for FilterKind {
fn to_string(&self) -> String {
match self {
FilterKind::Builtin => String::from("builtin"),
FilterKind::Proc => String::from("proc"),
}
}
}
impl FromStr for FilterKind {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"builtin" => Ok(FilterKind::Builtin),
"proc" => Ok(FilterKind::Proc),
_ => Err(()),
}
}
}

52
src/data_structures/filter_phase.rs Normal file
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@ -0,0 +1,52 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum FilterPhase {
Connect,
Helo,
Ehlo,
StartTls,
Auth,
MailFrom,
RcptTo,
Data,
DataLine,
Commit,
}
impl ToString for FilterPhase {
fn to_string(&self) -> String {
match self {
FilterPhase::Connect => String::from("connect"),
FilterPhase::Helo => String::from("helo"),
FilterPhase::Ehlo => String::from("ehlo"),
FilterPhase::StartTls => String::from("starttls"),
FilterPhase::Auth => String::from("auth"),
FilterPhase::MailFrom => String::from("mail-from"),
FilterPhase::RcptTo => String::from("rcpt-to"),
FilterPhase::Data => String::from("data"),
FilterPhase::DataLine => String::from("data-line"),
FilterPhase::Commit => String::from("commit"),
}
}
}
impl FromStr for FilterPhase {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"connect" => Ok(FilterPhase::Connect),
"helo" => Ok(FilterPhase::Helo),
"ehlo" => Ok(FilterPhase::Ehlo),
"starttls" => Ok(FilterPhase::StartTls),
"auth" => Ok(FilterPhase::Auth),
"mail-from" => Ok(FilterPhase::MailFrom),
"rcpt-to" => Ok(FilterPhase::RcptTo),
"data" => Ok(FilterPhase::Data),
"data-line" => Ok(FilterPhase::DataLine),
"commit" => Ok(FilterPhase::Commit),
_ => Err(()),
}
}
}

24
src/data_structures/filter_response.rs Normal file
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@ -0,0 +1,24 @@
use crate::SmtpStatusCode;
#[derive(Clone, Debug)]
pub enum FilterResponse {
Proceed,
Junk,
Reject(SmtpStatusCode),
Disconnect(SmtpStatusCode),
Rewrite(String),
Report(String),
}
impl ToString for FilterResponse {
fn to_string(&self) -> String {
match self {
FilterResponse::Proceed => String::from("proceed"),
FilterResponse::Junk => String::from("junk"),
FilterResponse::Reject(e) => format!("reject|{}", e.to_string()),
FilterResponse::Disconnect(e) => format!("disconnect|{}", e.to_string()),
FilterResponse::Rewrite(s) => format!("rewrite|{}", s),
FilterResponse::Report(s) => format!("report|{}", s),
}
}
}

31
src/data_structures/mail_result.rs Normal file
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@ -0,0 +1,31 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum MailResult {
Ok,
PermFail,
TempFail,
}
impl ToString for MailResult {
fn to_string(&self) -> String {
match self {
MailResult::Ok => String::from("ok"),
MailResult::PermFail => String::from("permfail"),
MailResult::TempFail => String::from("tempfail"),
}
}
}
impl FromStr for MailResult {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"ok" => Ok(MailResult::Ok),
"permfail" => Ok(MailResult::PermFail),
"tempfail" => Ok(MailResult::TempFail),
_ => Err(()),
}
}
}

28
src/data_structures/method.rs Normal file
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@ -0,0 +1,28 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Method {
Helo,
Ehlo,
}
impl ToString for Method {
fn to_string(&self) -> String {
match self {
Method::Helo => String::from("HELO"),
Method::Ehlo => String::from("EHLO"),
}
}
}
impl FromStr for Method {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"HELO" => Ok(Method::Helo),
"EHLO" => Ok(Method::Ehlo),
_ => Err(()),
}
}
}

11
src/data_structures/mod.rs Normal file
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@ -0,0 +1,11 @@
pub(crate) mod address;
pub(crate) mod auth_result;
pub(crate) mod event;
pub(crate) mod filter_kind;
pub(crate) mod filter_phase;
pub(crate) mod filter_response;
pub(crate) mod mail_result;
pub(crate) mod method;
pub(crate) mod smtp_status;
pub(crate) mod subsystem;
pub(crate) mod timeval;

116
src/data_structures/smtp_status.rs Normal file
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@ -0,0 +1,116 @@
#[derive(Clone, Debug)]
pub struct SmtpStatusCode {
pub number: usize,
pub text: String,
}
impl SmtpStatusCode {
pub fn from_number(error_number: usize) -> Self {
match error_number {
211 => SmtpStatusCode {
number: 211,
text: String::from("System status"),
},
220 => SmtpStatusCode {
number: 220,
text: String::from("Service ready"),
},
250 => SmtpStatusCode {
number: 250,
text: String::from("Requested mail action okay, completed"),
},
251 => SmtpStatusCode {
number: 251,
text: String::from("User not local; will forward"),
},
252 => SmtpStatusCode {
number: 252,
text: String::from(
"Cannot verify the user, but it will try to deliver the message anyway",
),
},
354 => SmtpStatusCode {
number: 354,
text: String::from("Start mail input"),
},
421 => SmtpStatusCode {
number: 421,
text: String::from("Service is unavailable because the server is shutting down"),
},
450 => SmtpStatusCode {
number: 450,
text: String::from("Requested mail action not taken: mailbox unavailable"),
},
451 => SmtpStatusCode {
number: 451,
text: String::from("Requested action aborted: local error in processing"),
},
452 => SmtpStatusCode {
number: 452,
text: String::from("Requested action not taken: insufficient system storage"),
},
455 => SmtpStatusCode {
number: 455,
text: String::from("Server unable to accommodate parameters"),
},
500 => SmtpStatusCode {
number: 500,
text: String::from("Syntax error, command unrecognized"),
},
501 => SmtpStatusCode {
number: 501,
text: String::from("Syntax error in parameters or arguments"),
},
502 => SmtpStatusCode {
number: 502,
text: String::from("Command not implemented"),
},
503 => SmtpStatusCode {
number: 503,
text: String::from("Bad sequence of commands"),
},
504 => SmtpStatusCode {
number: 504,
text: String::from("Command parameter is not implemented"),
},
521 => SmtpStatusCode {
number: 521,
text: String::from("Server does not accept mail"),
},
523 => SmtpStatusCode {
number: 523,
text: String::from("Encryption Needed"),
},
550 => SmtpStatusCode {
number: 550,
text: String::from("Requested action not taken: mailbox unavailable"),
},
552 => SmtpStatusCode {
number: 552,
text: String::from("Requested mail action aborted: exceeded storage allocation"),
},
553 => SmtpStatusCode {
number: 553,
text: String::from("Requested action not taken: mailbox name not allowed"),
},
554 => SmtpStatusCode {
number: 554,
text: String::from("Transaction has failed"),
},
556 => SmtpStatusCode {
number: 556,
text: String::from("Domain does not accept mail"),
},
nb => SmtpStatusCode {
number: nb,
text: String::new(),
},
}
}
}
impl ToString for SmtpStatusCode {
fn to_string(&self) -> String {
format!("{} {}", self.number, self.text)
}
}

25
src/data_structures/subsystem.rs Normal file
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@ -0,0 +1,25 @@
use std::str::FromStr;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum SubSystem {
SmtpIn,
}
impl ToString for SubSystem {
fn to_string(&self) -> String {
match self {
SubSystem::SmtpIn => String::from("smtp-in"),
}
}
}
impl FromStr for SubSystem {
type Err = ();
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"smtp-in" => Ok(SubSystem::SmtpIn),
_ => Err(()),
}
}
}

11
src/data_structures/timeval.rs Normal file
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@ -0,0 +1,11 @@
#[derive(Debug, Eq, PartialEq)]
pub struct TimeVal {
pub sec: i64,
pub usec: i64,
}
impl ToString for TimeVal {
fn to_string(&self) -> String {
format!("{}.{}", self.sec, self.usec)
}
}

219
src/filter.rs Normal file
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@ -0,0 +1,219 @@
use crate::{
Address, AuthResult, FilterEntry, FilterKind, FilterPhase, FilterResponse, MailResult, Method,
ReportEntry,
};
pub trait Filter {
fn on_report_link_auth(&mut self, _entry: &ReportEntry, _username: &str, _result: AuthResult) {}
fn has_report_link_auth(&self) -> bool {
return false;
}
fn on_report_link_connect(
&mut self,
_entry: &ReportEntry,
_rdns: &str,
_fcrdns: &str,
_src: &Address,
_dest: &Address,
) {
}
fn has_report_link_connect(&self) -> bool {
return false;
}
fn on_report_link_disconnect(&mut self, _entry: &ReportEntry) {}
fn has_report_link_disconnect(&self) -> bool {
return false;
}
fn on_report_link_greeting(&mut self, _entry: &ReportEntry, _hostname: &str) {}
fn has_report_link_greeting(&self) -> bool {
return false;
}
fn on_report_link_identify(&mut self, _entry: &ReportEntry, _method: Method, _identity: &str) {}
fn has_report_link_identify(&self) -> bool {
return false;
}
fn on_report_link_tls(&mut self, _entry: &ReportEntry, _tls_string: &str) {}
fn has_report_link_tls(&self) -> bool {
return false;
}
fn on_report_tx_begin(&mut self, _entry: &ReportEntry, _message_id: &str) {}
fn has_report_tx_begin(&self) -> bool {
return false;
}
fn on_report_tx_mail(
&mut self,
_entry: &ReportEntry,
_message_id: &str,
_result: MailResult,
_address: &str,
) {
}
fn has_report_tx_mail(&self) -> bool {
return false;
}
fn on_report_tx_reset(&mut self, _entry: &ReportEntry, _message_id: &Option<String>) {}
fn has_report_tx_reset(&self) -> bool {
return false;
}
fn on_report_tx_rcpt(
&mut self,
_entry: &ReportEntry,
_message_id: &str,
_result: MailResult,
_address: &str,
) {
}
fn has_report_tx_rcpt(&self) -> bool {
return false;
}
fn on_report_tx_envelope(
&mut self,
_entry: &ReportEntry,
_message_id: &str,
_envelope_id: &str,
) {
}
fn has_report_tx_envelope(&self) -> bool {
return false;
}
fn on_report_tx_data(&mut self, _entry: &ReportEntry, _message_id: &str, _result: MailResult) {}
fn has_report_tx_data(&self) -> bool {
return false;
}
fn on_report_tx_commit(
&mut self,
_entry: &ReportEntry,
_message_id: &str,
_message_size: usize,
) {
}
fn has_report_tx_commit(&self) -> bool {
return false;
}
fn on_report_tx_rollback(&mut self, _entry: &ReportEntry, _message_id: &str) {}
fn has_report_tx_rollback(&self) -> bool {
return false;
}
fn on_report_protocol_client(&mut self, _entry: &ReportEntry, _command: &str) {}
fn has_report_protocol_client(&self) -> bool {
return false;
}
fn on_report_protocol_server(&mut self, _entry: &ReportEntry, _response: &str) {}
fn has_report_protocol_server(&self) -> bool {
return false;
}
fn on_report_filter_response(
&mut self,
_entry: &ReportEntry,
_phase: FilterPhase,
_response: &str,
_param: &Option<String>,
) {
}
fn has_report_filter_response(&self) -> bool {
return false;
}
fn on_report_filter_report(
&mut self,
_entry: &ReportEntry,
_filter_kind: FilterKind,
_name: &str,
_message: &str,
) {
}
fn has_report_filter_report(&self) -> bool {
return false;
}
fn on_report_timeout(&mut self, _entry: &ReportEntry) {}
fn has_report_timeout(&self) -> bool {
return false;
}
fn on_filter_auth(&mut self, _entry: &FilterEntry, _auth: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_auth(&self) -> bool {
return false;
}
fn on_filter_commit(&mut self, _entry: &FilterEntry) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_commit(&self) -> bool {
return false;
}
fn on_filter_connect(
&mut self,
_entry: &FilterEntry,
_rdns: &str,
_fcrdns: &str,
_src: &Address,
_dest: &Address,
) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_connect(&self) -> bool {
return false;
}
fn on_filter_data(&mut self, _entry: &FilterEntry) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_data(&self) -> bool {
return false;
}
fn on_filter_ehlo(&mut self, _entry: &FilterEntry, _identity: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_ehlo(&self) -> bool {
return false;
}
fn on_filter_helo(&mut self, _entry: &FilterEntry, _identity: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_helo(&self) -> bool {
return false;
}
fn on_filter_mail_from(&mut self, _entry: &FilterEntry, _address: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_mail_from(&self) -> bool {
return false;
}
fn on_filter_rcpt_to(&mut self, _entry: &FilterEntry, _address: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_rcpt_to(&self) -> bool {
return false;
}
fn on_filter_starttls(&mut self, _entry: &FilterEntry, _tls_string: &str) -> FilterResponse {
FilterResponse::Proceed
}
fn has_filter_starttls(&self) -> bool {
return false;
}
}

46
src/io.rs Normal file
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@ -0,0 +1,46 @@
use std::io::{self, ErrorKind, Read};
use std::sync::mpsc::Sender;
pub(crate) fn read_stdin(tx: &Sender<Vec<u8>>) {
if let Err(e) = do_read_stdin(tx) {
log::error!("{}", e);
}
}
fn do_read_stdin(tx: &Sender<Vec<u8>>) -> Result<(), String> {
let mut read_buffer: [u8; crate::BUFFER_SIZE] = [0; crate::BUFFER_SIZE];
let mut line_buffer: Vec<u8> = Vec::with_capacity(crate::BUFFER_SIZE);
let mut stdin = io::stdin();
loop {
read_buffer.copy_from_slice(&[0; crate::BUFFER_SIZE]);
let len = match stdin.read(&mut read_buffer) {
Ok(n) => n,
Err(e) => match e.kind() {
ErrorKind::Interrupted => {
continue;
}
_ => {
return Err(e.to_string());
}
},
};
if len == 0 {
return Err(String::from("unable to read on stdin"));
}
line_buffer.extend_from_slice(&read_buffer);
loop {
match line_buffer.iter().position(|i| *i == b'\n') {
Some(id) => {
let pos = id + 1;
let mut line = Vec::with_capacity(pos);
line.extend_from_slice(&line_buffer[..pos]);
tx.send(line).unwrap();
line_buffer.drain(..pos);
}
None => {
break;
}
};
}
}
}

92
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mod data_structures;
mod filter;
mod io;
mod parsers;
mod process;
pub use crate::data_structures::address::Address;
pub use crate::data_structures::auth_result::AuthResult;
pub use crate::data_structures::event::Event;
pub use crate::data_structures::filter_kind::FilterKind;
pub use crate::data_structures::filter_phase::FilterPhase;
pub use crate::data_structures::filter_response::FilterResponse;
pub use crate::data_structures::mail_result::MailResult;
pub use crate::data_structures::method::Method;
pub use crate::data_structures::smtp_status::SmtpStatusCode;
pub use crate::data_structures::subsystem::SubSystem;
pub use crate::data_structures::timeval::TimeVal;
pub use crate::filter::Filter;
pub use crate::parsers::entry::{FilterEntry, ReportEntry};
use crate::parsers::handshake::parse_handshake;
use std::sync::mpsc::channel;
use std::thread;
const BUFFER_SIZE: usize = 4096;
#[macro_export]
macro_rules! register {
($name: ident) => {
fn $name(&self) -> bool {
return true;
}
};
}
macro_rules! recv {
($rx: ident) => {
match $rx.recv() {
Ok(b) => b,
Err(e) => {
log::error!("{}", e);
return;
}
}
};
}
pub fn run_filter<T>(user_object: &mut T)
where
T: Filter,
{
// IO init
let (tx, rx) = channel::<Vec<u8>>();
thread::spawn(move || {
io::read_stdin(&tx);
});
// Handshake
let mut handshake_buffer: Vec<u8> = Vec::with_capacity(BUFFER_SIZE);
let handshake = loop {
let buffer = recv!(rx);
handshake_buffer.extend_from_slice(&buffer);
if let Ok((_, handshake)) = parse_handshake(&handshake_buffer) {
break handshake;
}
};
handshake_reply(user_object, handshake.subsystem);
// Read and process input
loop {
let buffer = recv!(rx);
if let Err(msg) = process::line(user_object, &buffer) {
log::error!("{}", msg);
}
}
}
macro_rules! handshake_register {
($obj: ident, $func: ident, $subsystem: expr, $type: expr, $name: expr) => {
if $obj.$func() {
println!("register|{}|{}|{}", $type, $subsystem.to_string(), $name);
}
};
}
fn handshake_reply<T>(obj: &mut T, ss: SubSystem)
where
T: Filter,
{
handshake_register!(obj, has_report_link_connect, ss, "report", "link-connect");
println!("register|ready");
}

159
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use super::{parse_data_structure, parse_delimiter, parse_string_parameter};
use crate::Event;
use crate::FilterPhase;
use crate::SubSystem;
use crate::TimeVal;
use nom::branch::alt;
use nom::bytes::streaming::tag;
use nom::character::streaming::digit1;
use nom::combinator::map_res;
use nom::IResult;
pub struct ReportEntry {
pub version: String,
pub timestamp: TimeVal,
pub subsystem: SubSystem,
pub event: Event,
pub session_id: String,
}
pub struct FilterEntry {
pub version: String,
pub timestamp: TimeVal,
pub subsystem: SubSystem,
pub phase: FilterPhase,
pub session_id: String,
pub token: String,
}
pub struct DataLineEntry {
pub session_id: String,
pub token: String,
}
pub(crate) enum EntryOption {
Report(ReportEntry),
Filter(FilterEntry),
DataLine(DataLineEntry),
}
pub(crate) fn parse_entry(input: &[u8]) -> IResult<&[u8], EntryOption> {
let (input, entry) = alt((
parse_report_entry_meta,
alt((parse_filter_entry_meta, parse_data_line_entry_meta)),
))(input)?;
Ok((input, entry))
}
fn parse_report_entry_meta(input: &[u8]) -> IResult<&[u8], EntryOption> {
let (input, _) = tag("report")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, entry) = parse_report_entry(input)?;
Ok((input, EntryOption::Report(entry)))
}
fn parse_filter_entry_meta(input: &[u8]) -> IResult<&[u8], EntryOption> {
let (input, _) = tag("filter")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, entry) = parse_filter_entry(input)?;
Ok((input, EntryOption::Filter(entry)))
}
fn parse_data_line_entry_meta(input: &[u8]) -> IResult<&[u8], EntryOption> {
let (input, _) = tag("filter-dataline")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, data_line) = parse_data_line_entry(input)?;
Ok((input, EntryOption::DataLine(data_line)))
}
fn parse_report_entry(input: &[u8]) -> IResult<&[u8], ReportEntry> {
let (input, version) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, timestamp) = parse_timestamp(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, subsystem) = parse_data_structure::<SubSystem>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, event) = parse_data_structure::<Event>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, session_id) = parse_string_parameter(input)?;
let entry = ReportEntry {
version,
timestamp,
subsystem,
event,
session_id,
};
Ok((input, entry))
}
fn parse_filter_entry(input: &[u8]) -> IResult<&[u8], FilterEntry> {
let (input, version) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, timestamp) = parse_timestamp(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, subsystem) = parse_data_structure::<SubSystem>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, phase) = parse_data_structure::<FilterPhase>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, session_id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, token) = parse_string_parameter(input)?;
let entry = FilterEntry {
version,
timestamp,
subsystem,
phase,
session_id,
token,
};
Ok((input, entry))
}
fn parse_data_line_entry(input: &[u8]) -> IResult<&[u8], DataLineEntry> {
let (input, session_id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, token) = parse_string_parameter(input)?;
let entry = DataLineEntry { session_id, token };
Ok((input, entry))
}
fn parse_timestamp(input: &[u8]) -> IResult<&[u8], TimeVal> {
let (input, sec) = map_res(digit1, |s| String::from_utf8_lossy(s).parse::<i64>())(input)?;
let (input, _) = tag(".")(input)?;
let (input, usec) = map_res(digit1, |s| {
format!("{:0<6}", String::from_utf8_lossy(s)).parse::<i64>()
})(input)?;
let timestamp = TimeVal { sec, usec };
Ok((input, timestamp))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_report_link_connect() {
let input = b"report|0.5|1576146008.06099|smtp-in|link-connect|7641df9771b4ed00|mail.openbsd.org|pass|199.185.178.25:33174|45.77.67.80:25";
let res = parse_entry(input);
assert!(res.is_ok());
let (_, res) = res.unwrap();
let res = match res {
EntryOption::Report(r) => r,
_ => {
assert!(false);
return;
}
};
assert_eq!(res.version, String::from("0.5"));
assert_eq!(
res.timestamp,
TimeVal {
sec: 1576146008,
usec: 60990
}
);
assert_eq!(res.subsystem, SubSystem::SmtpIn);
assert_eq!(res.event, Event::LinkConnect);
assert_eq!(res.session_id, String::from("7641df9771b4ed00"));
}
}

122
src/parsers/handshake.rs Normal file
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use super::{
parse_data_structure, parse_delimiter, parse_eol, parse_string_parameter, parse_usize,
};
use crate::SubSystem;
use nom::bytes::streaming::tag;
use nom::IResult;
#[derive(Debug)]
pub(crate) struct Handshake {
pub(crate) smtpd_version: String,
pub(crate) smtp_session_timeout: usize,
pub(crate) subsystem: SubSystem,
}
pub(crate) fn parse_handshake(input: &[u8]) -> IResult<&[u8], Handshake> {
let (input, smtpd_version) = parse_smtpd_version(input)?;
let (input, smtp_session_timeout) = parse_smtp_session_timeout(input)?;
let (input, subsystem) = parse_subsystem(input)?;
let (input, _) = parse_ready(input)?;
let handshake = Handshake {
smtpd_version,
smtp_session_timeout,
subsystem,
};
Ok((input, handshake))
}
fn parse_smtpd_version(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_config_initial(input)?;
let (input, _) = tag("smtpd-version")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, version) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, version))
}
fn parse_smtp_session_timeout(input: &[u8]) -> IResult<&[u8], usize> {
let (input, _) = parse_config_initial(input)?;
let (input, _) = tag("smtp-session-timeout")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, timeout) = parse_usize(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, timeout))
}
fn parse_subsystem(input: &[u8]) -> IResult<&[u8], SubSystem> {
let (input, _) = parse_config_initial(input)?;
let (input, _) = tag("subsystem")(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, subsystem) = parse_data_structure::<SubSystem>(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, subsystem))
}
fn parse_ready(input: &[u8]) -> IResult<&[u8], ()> {
let (input, _) = parse_config_initial(input)?;
let (input, _) = tag("ready")(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, ()))
}
fn parse_config_initial(input: &[u8]) -> IResult<&[u8], ()> {
let (input, _) = tag("config")(input)?;
let (input, _) = parse_delimiter(input)?;
Ok((input, ()))
}
#[cfg(test)]
mod tests {
use super::parse_handshake;
use crate::SubSystem;
#[test]
fn test_valid_handshake_nl() {
let input = b"config|smtpd-version|6.6.1\nconfig|smtp-session-timeout|300\nconfig|subsystem|smtp-in\nconfig|ready\n";
let r = parse_handshake(input);
assert!(r.is_ok());
let (r, h) = r.unwrap();
assert_eq!(r, b"");
assert_eq!(h.smtpd_version, "6.6.1");
assert_eq!(h.smtp_session_timeout, 300);
assert_eq!(h.subsystem, SubSystem::SmtpIn);
}
#[test]
fn test_valid_handshake_crnl() {
let input = b"config|smtpd-version|6.6.1\r\nconfig|smtp-session-timeout|300\r\nconfig|subsystem|smtp-in\r\nconfig|ready\r\n";
let r = parse_handshake(input);
assert!(r.is_ok());
let (r, h) = r.unwrap();
assert_eq!(r, b"");
assert_eq!(h.smtpd_version, "6.6.1");
assert_eq!(h.smtp_session_timeout, 300);
assert_eq!(h.subsystem, SubSystem::SmtpIn);
}
#[test]
fn test_valid_handshake_over() {
let input = b"config|smtpd-version|6.6.1\nconfig|smtp-session-timeout|300\nconfig|subsystem|smtp-in\nconfig|ready\nplop";
let r = parse_handshake(input);
assert!(r.is_ok());
let (r, h) = r.unwrap();
assert_eq!(r, b"plop");
assert_eq!(h.smtpd_version, "6.6.1");
assert_eq!(h.smtp_session_timeout, 300);
assert_eq!(h.subsystem, SubSystem::SmtpIn);
}
#[test]
fn test_invalid_handshakes() {
let test_vectors = vec![
"config|smtpd-version|6.6.1\nconfig|smtp-session-timeout|\nconfig|subsystem|smtp-in\nconfig|ready\n",
"config|smtp-session-timeout|300\nconfig|smtpd-version|6.6.1\nconfig|subsystem|smtp-in\nconfig|ready\n",
"config|smtpd-version|6.6.1\nconfig|smtp-session-timeout|300\nconfig|subsystem|smtp-in\nconfig|ready",
"config|smtpd-version|6.6.1\nconfig|smtp-session-timeout|300\nconfig|subsystem|smtp-in\nconfig|ready\r",
];
for input in test_vectors {
let r = parse_handshake(input.as_bytes());
assert!(r.is_err());
}
}
}

66
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pub(crate) mod entry;
pub(crate) mod handshake;
pub(crate) mod parameters;
use nom::branch::alt;
use nom::bytes::streaming::{tag, take_while1};
use nom::combinator::map_res;
use nom::IResult;
use std::str::FromStr;
fn is_body_char(c: u8) -> bool {
!(c as char).is_control()
}
fn is_parameter_char(c: u8) -> bool {
is_body_char(c) && (c as char) != '|'
}
fn parse_string_parameter(input: &[u8]) -> IResult<&[u8], String> {
let (input, s) = take_while1(is_parameter_char)(input)?;
Ok((input, String::from_utf8(s.to_vec()).unwrap()))
}
fn parse_data_structure<T>(input: &[u8]) -> IResult<&[u8], T>
where
T: FromStr,
{
map_res(take_while1(is_parameter_char), |s: &[u8]| {
T::from_str(&String::from_utf8_lossy(s))
})(input)
}
fn parse_delimiter(input: &[u8]) -> IResult<&[u8], &[u8]> {
tag("|")(input)
}
fn parse_eol(input: &[u8]) -> IResult<&[u8], &[u8]> {
alt((tag("\r\n"), tag("\n")))(input)
}
fn parse_usize(input: &[u8]) -> IResult<&[u8], usize> {
map_res(take_while1(|c| (c as char).is_ascii_digit()), |s| {
usize::from_str_radix(&String::from_utf8_lossy(s), 10)
})(input)
}
#[cfg(test)]
mod tests {
use super::is_parameter_char;
#[test]
fn test_valid_parameter_char() {
let char_lst = "a0.:-_/";
for c in char_lst.bytes() {
assert!(is_parameter_char(c));
}
}
#[test]
fn test_invalid_parameter_char() {
let char_lst = "|\n";
for c in char_lst.bytes() {
assert!(!is_parameter_char(c));
}
}
}

317
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use super::{
is_parameter_char, parse_data_structure, parse_delimiter, parse_eol, parse_string_parameter,
parse_usize,
};
use crate::{Address, AuthResult, FilterKind, FilterPhase, MailResult, Method};
use nom::branch::alt;
use nom::bytes::streaming::{tag, take_while1};
use nom::combinator::{map_res, opt};
use nom::IResult;
use std::net::SocketAddr;
use std::path::PathBuf;
pub(crate) fn parse_filter_auth(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_filter_connect(
input: &[u8],
) -> IResult<&[u8], (String, String, Address, Address)> {
let (input, _) = parse_delimiter(input)?;
let (input, rdns) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, fcrdns) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, src) = parse_address(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, dest) = parse_address(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (rdns, fcrdns, src, dest)))
}
pub(crate) fn parse_filter_ehlo(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_filter_helo(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_filter_mail_from(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_filter_rcpt_to(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_filter_starttls(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, s))
}
pub(crate) fn parse_report_link_auth(input: &[u8]) -> IResult<&[u8], (String, AuthResult)> {
let (input, _) = parse_delimiter(input)?;
let (input, username) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, result) = parse_data_structure::<AuthResult>(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (username, result)))
}
pub(crate) fn parse_report_link_connect(
input: &[u8],
) -> IResult<&[u8], (String, String, Address, Address)> {
let (input, _) = parse_delimiter(input)?;
let (input, rdns) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, fcrdns) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, src) = parse_address(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, dest) = parse_address(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (rdns, fcrdns, src, dest)))
}
pub(crate) fn parse_report_link_greeting(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, hostname) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, hostname))
}
pub(crate) fn parse_report_link_identify(input: &[u8]) -> IResult<&[u8], (Method, String)> {
let (input, _) = parse_delimiter(input)?;
let (input, method) = parse_data_structure::<Method>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, identity) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (method, identity)))
}
pub(crate) fn parse_report_link_tls(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, tls_string) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, tls_string))
}
pub(crate) fn parse_report_tx_begin(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, id))
}
pub(crate) fn parse_report_tx_mail(input: &[u8]) -> IResult<&[u8], (String, MailResult, String)> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, result) = parse_data_structure::<MailResult>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, addr) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (id, result, addr)))
}
pub(crate) fn parse_report_tx_reset(input: &[u8]) -> IResult<&[u8], Option<String>> {
let (input, id) = opt(parse_tx_reset_opt)(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, id))
}
fn parse_tx_reset_opt(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
Ok((input, id))
}
pub(crate) fn parse_report_tx_rcpt(input: &[u8]) -> IResult<&[u8], (String, MailResult, String)> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, result) = parse_data_structure::<MailResult>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, addr) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (id, result, addr)))
}
pub(crate) fn parse_report_tx_envelope(input: &[u8]) -> IResult<&[u8], (String, String)> {
let (input, _) = parse_delimiter(input)?;
let (input, msg) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, env) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (msg, env)))
}
pub(crate) fn parse_report_tx_data(input: &[u8]) -> IResult<&[u8], (String, MailResult)> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, result) = parse_data_structure::<MailResult>(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (id, result)))
}
pub(crate) fn parse_report_tx_commit(input: &[u8]) -> IResult<&[u8], (String, usize)> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, s) = parse_usize(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (id, s)))
}
pub(crate) fn parse_report_tx_rollback(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, id) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, id))
}
pub(crate) fn parse_report_protocol_client(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, cmd) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, cmd))
}
pub(crate) fn parse_report_protocol_server(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
let (input, res) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, res))
}
pub(crate) fn parse_report_filter_response(
input: &[u8],
) -> IResult<&[u8], (FilterPhase, String, Option<String>)> {
let (input, _) = parse_delimiter(input)?;
let (input, phase) = parse_data_structure::<FilterPhase>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, res) = parse_string_parameter(input)?;
let (input, param) = opt(parse_filter_response_opt)(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (phase, res, param)))
}
fn parse_filter_response_opt(input: &[u8]) -> IResult<&[u8], String> {
let (input, _) = parse_delimiter(input)?;
parse_string_parameter(input)
}
pub(crate) fn parse_report_filter_report(
input: &[u8],
) -> IResult<&[u8], (FilterKind, String, String)> {
let (input, _) = parse_delimiter(input)?;
let (input, kind) = parse_data_structure::<FilterKind>(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, name) = parse_string_parameter(input)?;
let (input, _) = parse_delimiter(input)?;
let (input, message) = parse_string_parameter(input)?;
let (input, _) = parse_eol(input)?;
Ok((input, (kind, name, message)))
}
fn parse_address(input: &[u8]) -> IResult<&[u8], Address> {
alt((parse_unix_socket, parse_socketaddr))(input)
}
fn parse_socketaddr(input: &[u8]) -> IResult<&[u8], Address> {
map_res(
take_while1(is_parameter_char),
|s: &[u8]| -> Result<Address, String> {
let s = String::from_utf8(s.to_vec()).map_err(|e| e.to_string())?;
let addr = s.parse::<SocketAddr>().map_err(|e| e.to_string())?;
Ok(Address::Ip(addr))
},
)(input)
}
fn parse_unix_socket(input: &[u8]) -> IResult<&[u8], Address> {
let (input, _) = tag("unix:")(input)?;
map_res(
take_while1(is_parameter_char),
|s: &[u8]| -> Result<Address, String> {
let s = String::from_utf8(s.to_vec()).map_err(|e| e.to_string())?;
let addr = s.parse::<PathBuf>().map_err(|e| e.to_string())?;
Ok(Address::UnixSocket(addr))
},
)(input)
}
#[cfg(test)]
mod tests {
use super::*;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use std::path::Path;
#[test]
fn test_ipv4_port() {
let res = parse_address(b"199.185.178.25:33174|");
assert!(res.is_ok());
let (i, addr) = res.unwrap();
assert_eq!(i, b"|");
match addr {
Address::Ip(addr) => {
assert!(addr.is_ipv4());
assert_eq!(addr.port(), 33174);
assert_eq!(addr.ip(), IpAddr::V4(Ipv4Addr::new(199, 185, 178, 25)));
}
Address::UnixSocket(_) => assert!(false),
};
}
#[test]
fn test_ipv6_port() {
let res = parse_address(b"[2001:db8::42]:33174\n");
assert!(res.is_ok());
let (i, addr) = res.unwrap();
assert_eq!(i, b"\n");
match addr {
Address::Ip(addr) => {
assert!(addr.is_ipv6());
assert_eq!(addr.port(), 33174);
assert_eq!(
addr.ip(),
IpAddr::V6(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0x42))
);
}
Address::UnixSocket(_) => assert!(false),
};
}
#[test]
fn test_unix_socket() {
let res = parse_address(b"unix:/var/something.sock|");
assert!(res.is_ok());
let (i, addr) = res.unwrap();
assert_eq!(i, b"|");
match addr {
Address::UnixSocket(addr) => {
assert_eq!(addr, Path::new("/var/something.sock").to_path_buf());
}
Address::Ip(_) => assert!(false),
};
}
}

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src/process.rs Normal file
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@ -0,0 +1,168 @@
use crate::parsers::entry::{parse_entry, EntryOption};
use crate::parsers::parameters::{
parse_filter_auth, parse_filter_connect, parse_filter_ehlo, parse_filter_helo,
parse_filter_mail_from, parse_filter_rcpt_to, parse_filter_starttls,
parse_report_filter_report, parse_report_filter_response, parse_report_link_auth,
parse_report_link_connect, parse_report_link_greeting, parse_report_link_identify,
parse_report_link_tls, parse_report_protocol_client, parse_report_protocol_server,
parse_report_tx_begin, parse_report_tx_commit, parse_report_tx_data, parse_report_tx_envelope,
parse_report_tx_mail, parse_report_tx_rcpt, parse_report_tx_reset, parse_report_tx_rollback,
};
use crate::{Event, Filter, FilterPhase};
macro_rules! handle_reports {
($obj: ident, $r: ident, $input: ident) => {
match $r.event {
Event::LinkAuth => {
let (_, (username, result)) =
parse_report_link_auth($input).map_err(|e| e.to_string())?;
$obj.on_report_link_auth(&$r, &username, result);
}
Event::LinkConnect => {
let (_, (rdns, fcrdns, src, dest)) =
parse_report_link_connect($input).map_err(|e| e.to_string())?;
$obj.on_report_link_connect(&$r, &rdns, &fcrdns, &src, &dest);
}
Event::LinkDisconnect => {
$obj.on_report_link_disconnect(&$r);
}
Event::LinkGreeting => {
let (_, hostname) =
parse_report_link_greeting($input).map_err(|e| e.to_string())?;
$obj.on_report_link_greeting(&$r, &hostname);
}
Event::LinkIdentify => {
let (_, (method, identity)) =
parse_report_link_identify($input).map_err(|e| e.to_string())?;
$obj.on_report_link_identify(&$r, method, &identity);
}
Event::LinkTls => {
let (_, s) = parse_report_link_tls($input).map_err(|e| e.to_string())?;
$obj.on_report_link_tls(&$r, &s);
}
Event::TxBegin => {
let (_, id) = parse_report_tx_begin($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_begin(&$r, &id);
}
Event::TxMail => {
let (_, (id, result, addr)) =
parse_report_tx_mail($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_mail(&$r, &id, result, &addr);
}
Event::TxReset => {
let (_, id) = parse_report_tx_reset($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_reset(&$r, &id);
}
Event::TxRcpt => {
let (_, (id, result, addr)) =
parse_report_tx_rcpt($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_rcpt(&$r, &id, result, &addr);
}
Event::TxEnvelope => {
let (_, (msg, env)) =
parse_report_tx_envelope($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_envelope(&$r, &msg, &env);
}
Event::TxData => {
let (_, (id, result)) = parse_report_tx_data($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_data(&$r, &id, result);
}
Event::TxCommit => {
let (_, (id, size)) = parse_report_tx_commit($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_commit(&$r, &id, size);
}
Event::TxRollback => {
let (_, id) = parse_report_tx_rollback($input).map_err(|e| e.to_string())?;
$obj.on_report_tx_rollback(&$r, &id);
}
Event::ProtocolClient => {
let (_, cmd) = parse_report_protocol_client($input).map_err(|e| e.to_string())?;
$obj.on_report_protocol_client(&$r, &cmd);
}
Event::ProtocolServer => {
let (_, res) = parse_report_protocol_server($input).map_err(|e| e.to_string())?;
$obj.on_report_protocol_server(&$r, &res);
}
Event::FilterResponse => {
let (_, (phase, res, param)) =
parse_report_filter_response($input).map_err(|e| e.to_string())?;
$obj.on_report_filter_response(&$r, phase, &res, &param);
}
Event::FilterReport => {
let (_, (kind, name, message)) =
parse_report_filter_report($input).map_err(|e| e.to_string())?;
$obj.on_report_filter_report(&$r, kind, &name, &message);
}
Event::Timeout => {
$obj.on_report_timeout(&$r);
}
}
};
}
macro_rules! handle_filters {
($obj: ident, $f: ident, $input: ident) => {
match $f.phase {
FilterPhase::Auth => {
let (_, auth) = parse_filter_auth($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_auth(&$f, &auth))
}
FilterPhase::Commit => Some($obj.on_filter_commit(&$f)),
FilterPhase::Connect => {
let (_, (rdns, fcrdns, src, dest)) =
parse_filter_connect($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_connect(&$f, &rdns, &fcrdns, &src, &dest))
}
FilterPhase::Data => Some($obj.on_filter_data(&$f)),
FilterPhase::DataLine => None,
FilterPhase::Ehlo => {
let (_, identity) = parse_filter_ehlo($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_ehlo(&$f, &identity))
}
FilterPhase::Helo => {
let (_, identity) = parse_filter_helo($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_helo(&$f, &identity))
}
FilterPhase::MailFrom => {
let (_, address) = parse_filter_mail_from($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_mail_from(&$f, &address))
}
FilterPhase::RcptTo => {
let (_, address) = parse_filter_rcpt_to($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_rcpt_to(&$f, &address))
}
FilterPhase::StartTls => {
let (_, tls_str) = parse_filter_starttls($input).map_err(|e| e.to_string())?;
Some($obj.on_filter_starttls(&$f, &tls_str))
}
}
};
}
macro_rules! handle_data_line {
($obj: ident, $f: ident, $input: ident) => {{
// TODO
}};
}
pub(crate) fn line<T>(user_object: &mut T, input: &[u8]) -> Result<(), String>
where
T: Filter,
{
let (input, entry) = parse_entry(input).map_err(|e| e.to_string())?;
match entry {
EntryOption::Report(r) => handle_reports!(user_object, r, input),
EntryOption::Filter(f) => {
if let Some(answer) = handle_filters!(user_object, f, input) {
println!(
"filter-result|{}|{}|{}",
f.session_id,
f.token,
answer.to_string()
);
};
}
EntryOption::DataLine(l) => handle_data_line!(user_object, l, input),
};
Ok(())
}