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"fuzz_targets/smtp-parser.rs" +test = false +doc = false diff --git a/fuzz/fuzz_targets/smtp-parser.rs b/fuzz/fuzz_targets/smtp-parser.rs new file mode 100644 index 0000000..0fa814d --- /dev/null +++ b/fuzz/fuzz_targets/smtp-parser.rs @@ -0,0 +1,8 @@ +#![no_main] +use libfuzzer_sys::fuzz_target; + +use smtp::RawCommand; + +fuzz_target!(|data: &[u8]| { + RawCommand::parse(data); +}); diff --git a/smtp/Cargo.toml b/smtp/Cargo.toml new file mode 100644 index 0000000..d29c9d3 --- /dev/null +++ b/smtp/Cargo.toml @@ -0,0 +1,10 @@ +[package] +name = "smtp" +version = "0.1.0" +authors = ["Michael Zhang "] +edition = "2018" + +[dependencies] +pest = "2.1.3" +pest_derive = "2.1.0" +thiserror = "1.0.22" diff --git a/smtp/src/command.pest b/smtp/src/command.pest new file mode 100644 index 0000000..ecc21f1 --- /dev/null +++ b/smtp/src/command.pest @@ -0,0 +1,34 @@ +// RFC 5321 + +domain = ${ sub_domain ~ ("." ~ sub_domain)* } +sub_domain = ${ let_dig ~ ldh_str? } + +let_dig = ${ ALPHA | DIGIT } +ldh_str = ${ (ALPHA | DIGIT | "-")* ~ let_dig } +address_literal = ${ "[" ~ address_literal_inner ~ "]" } +address_literal_inner = ${ ipv4_address_literal | ipv6_address_literal | general_address_literal } + +ipv4_address_literal = ${ snum ~ ("." ~ snum){3} } +ipv6_address_literal = ${ "IPv6:" ~ ipv6_addr } +general_address_literal = ${ standardized_tag ~ ":" ~ dcontent+ } + +standardized_tag = ${ ldh_str } +dcontent = ${ '\u{21}'..'\u{5a}' } + +ipv6_addr = ${ ipv6_full } // | ipv6_comp | ipv6v4_full | ipv6v4_comp } +ipv6_hex = ${ HEXDIG{1,4} } +ipv6_full = ${ ipv6_hex ~ (":" ~ ipv6_hex){7} } + +snum = ${ DIGIT{1,3} } + +// commands + +ehlo = ${ "EHLO" ~ SP ~ (domain | address_literal) } +helo = ${ "HELO" ~ SP ~ domain } + +// RFC 5324 + +ALPHA = { 'A'..'Z' | 'a'..'z' } +DIGIT = { '0'..'9' } +HEXDIG = { DIGIT | 'A'..'F' } +SP = { " " } diff --git a/smtp/src/command.rs b/smtp/src/command.rs new file mode 100644 index 0000000..918f8ca --- /dev/null +++ b/smtp/src/command.rs @@ -0,0 +1,83 @@ +use std::convert::TryFrom; + +#[derive(Parser)] +#[grammar = "command.pest"] +struct CommandParser; + +// minimal commands needed: +// EHLO HELO MAIL RCPT DATA RSET NOOP QUIT VRFY + +#[derive(Debug)] +pub enum RichCommand { + EHLO, + Unknown(String), +} + +#[derive(Debug, Error)] +pub enum ParseError { + #[error("command is too short")] + CommandTooShort, + + #[error("unexpected 5-char command")] + CommandMangled, + + #[error("no space after verb")] + NotSpaceAfterVerb, + + #[error("utf-8 parsing error: {0}")] + Utf8(#[from] std::str::Utf8Error), + + #[error("unknown verb: {0}")] + UnknownVerb(String), +} + +impl<'a> TryFrom> for RichCommand { + type Error = ParseError; + + fn try_from(cmd: RawCommand<'a>) -> Result { + match cmd.verb { + "EHLO" => Ok(RichCommand::EHLO), + unknown => Err(ParseError::UnknownVerb(unknown.to_string())), + } + } +} + +#[derive(Default, Debug)] +pub struct RawCommand<'a> { + pub verb: &'a str, + pub args: Vec<&'a str>, +} + +impl<'a> RawCommand<'a> { + pub fn parse(line: &'a [u8]) -> Result { + let len = line.len(); + + let verb = match len { + 0 => return Ok(RawCommand::default()), + l if l < 4 => return Err(ParseError::CommandTooShort), + 5 => return Err(ParseError::CommandMangled), + _ => std::str::from_utf8(&line[..4])?, + }; + + if len == 4 { + return Ok(RawCommand { verb, args: vec![] }); + } + + // catch arguments (we are guaranteed to have at least 5 chars) + if line[4] != b' ' { + return Err(ParseError::NotSpaceAfterVerb); + } + + // this is probably wrong, but works for now + let args = if line.len() > 4 { + line[5..] + .split(|c| *c == b' ') + .map(|bytes| std::str::from_utf8(bytes)) + .collect::, std::str::Utf8Error>>()? + } else { + Vec::new() + }; + + Ok(RawCommand { verb, args }) + } +} diff --git a/smtp/src/lib.rs b/smtp/src/lib.rs new file mode 100644 index 0000000..9f8bf94 --- /dev/null +++ b/smtp/src/lib.rs @@ -0,0 +1,10 @@ +#[macro_use] +extern crate pest_derive; +#[macro_use] +extern crate thiserror; + +mod command; +mod replies; + +pub use crate::command::{RawCommand, RichCommand}; +pub use crate::replies::Reply; diff --git a/smtp/src/replies.rs b/smtp/src/replies.rs new file mode 100644 index 0000000..7f17929 --- /dev/null +++ b/smtp/src/replies.rs @@ -0,0 +1,25 @@ +use std::fmt; + +pub enum Reply { + R220(Option<(String, Option)>), +} + +impl Reply {} + +impl fmt::Display for Reply { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + match self { + Reply::R220(rest) => { + write!(f, "220")?; + if let Some((domain, rest)) = rest { + write!(f, " {}", domain)?; + if let Some(textstring) = rest { + write!(f, " {}", textstring)?; + } + } + } + } + write!(f, "\r\n")?; + Ok(()) + } +} diff --git a/src/main.rs b/src/main.rs index e7a11a9..5fc6fa9 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,52 @@ -fn main() { - println!("Hello, world!"); +use std::convert::TryFrom; + +use anyhow::Result; +use smtp::{RawCommand, Reply, RichCommand}; +use tokio::{ + io::{AsyncBufReadExt, AsyncWriteExt, BufReader}, + net::{TcpListener, TcpStream}, +}; + +#[tokio::main] +async fn main() -> Result<()> { + let listener = TcpListener::bind("127.0.0.1:6000").await?; + + loop { + let (socket, _) = listener.accept().await?; + println!("received socket: {:?}", socket); + + tokio::spawn(process_socket(socket)); + } +} + +async fn process_socket(socket: TcpStream) { + if let Err(err) = process_socket_inner(socket).await { + eprintln!("error: {}", err); + } +} + +async fn process_socket_inner(mut socket: TcpStream) -> Result<()> { + let (reader, mut writer) = socket.split(); + let reader = BufReader::new(reader); + + // write initial greeting + let reply = Reply::R220(Some((String::from("localhost"), None))); + writer.write_all(reply.to_string().as_bytes()).await?; + + let mut lines = reader.lines(); + println!("reading..."); + while let Some(line) = lines.next_line().await? { + println!("line: {:?}", line); + + let raw_command = RawCommand::parse(line.as_bytes())?; + println!("raw command: {:?}", raw_command); + + let rich_command = RichCommand::try_from(raw_command)?; + println!("rich command: {:?}", rich_command); + + println!(); + } + + println!("closed"); + Ok(()) }