@smbcloud / smbcloud-mail-imap / commits / d047d95

Initial commit

Seto committed Oct 9, 2025 at 14:13 UTC d047d95d3fe9913a8374b63437dda2b94988f66f
11 files changed +1096
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547 + "once_cell",
548 + "rustix",
549 + "windows-sys 0.59.0",
550 +]
551 +
552 +[[package]]
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554 +version = "1.47.1"
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556 +checksum = "89e49afdadebb872d3145a5638b59eb0691ea23e46ca484037cfab3b76b95038"
557 +dependencies = [
558 + "backtrace",
559 + "bytes",
560 + "io-uring",
561 + "libc",
562 + "mio",
563 + "pin-project-lite",
564 + "slab",
565 + "socket2",
566 + "tokio-macros",
567 + "windows-sys 0.59.0",
568 +]
569 +
570 +[[package]]
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576 + "proc-macro2",
577 + "quote",
578 + "syn",
579 +]
580 +
581 +[[package]]
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599 + "futures-sink",
600 + "pin-project-lite",
601 + "tokio",
602 +]
603 +
604 +[[package]]
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609 +dependencies = [
610 + "pin-project-lite",
611 + "tracing-attributes",
612 + "tracing-core",
613 +]
614 +
615 +[[package]]
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617 +version = "0.1.30"
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620 +dependencies = [
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624 +]
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660 +]
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683 + "windows-targets",
684 +]
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693 +]
694 +
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700 +dependencies = [
701 + "windows_aarch64_gnullvm",
702 + "windows_aarch64_msvc",
703 + "windows_i686_gnu",
704 + "windows_i686_gnullvm",
705 + "windows_i686_msvc",
706 + "windows_x86_64_gnu",
707 + "windows_x86_64_gnullvm",
708 + "windows_x86_64_msvc",
709 +]
710 +
711 +[[package]]
712 +name = "windows_aarch64_gnullvm"
713 +version = "0.52.6"
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717 +[[package]]
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740 +
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747 +[[package]]
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751 +checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
752 +
753 +[[package]]
754 +name = "windows_x86_64_msvc"
755 +version = "0.52.6"
756 +source = "registry+https://github.com/rust-lang/crates.io-index"
757 +checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
758 +
759 +[[package]]
760 +name = "wit-bindgen"
761 +version = "0.46.0"
762 +source = "registry+https://github.com/rust-lang/crates.io-index"
763 +checksum = "f17a85883d4e6d00e8a97c586de764dabcc06133f7f1d55dce5cdc070ad7fe59"
Cargo.toml new
+15
@@ -0,0 +1,15 @@
1 +[package]
2 +name = "smbcloud-mail"
3 +version = "0.1.0"
4 +edition = "2024"
5 +
6 +[dependencies]
7 +tokio = { version = "1", features = [ "macros","io-util","net","rt", "rt-multi-thread"] }
8 +tokio-util = { version = "0.7", features = ["codec"] }
9 +tokio-native-tls = "0.3"
10 +native-tls = "0.2"
11 +anyhow = "1"
12 +tracing = "0.1"
13 +regex = "1"
14 +futures = "0.3"
15 +openssl = "0.10"
src/generate_certificate.rs new
+46
@@ -0,0 +1,46 @@
1 +use openssl::{
2 + asn1::Asn1Time,
3 + pkey::PKey,
4 + rsa::Rsa,
5 + x509::{
6 + X509, X509NameBuilder,
7 + extension::{AuthorityKeyIdentifier, BasicConstraints, SubjectKeyIdentifier},
8 + },
9 +};
10 +
11 +pub fn generate_certificate() -> anyhow::Result<(String, String)> {
12 + let cert_result = {
13 + let rsa = Rsa::generate(4096)?;
14 + let pkey = PKey::from_rsa(rsa)?;
15 + let mut name = X509NameBuilder::new()?;
16 + name.append_entry_by_text("CN", "localhost")?;
17 + let name = name.build();
18 + let mut builder = X509::builder()?;
19 + builder.set_version(2)?;
20 + builder.set_subject_name(&name)?;
21 + builder.set_issuer_name(&name)?;
22 + builder.set_pubkey(&pkey)?;
23 + let now = Asn1Time::days_from_now(0)?;
24 + let later = Asn1Time::days_from_now(3650)?;
25 + builder.set_not_before(now.as_ref())?;
26 + builder.set_not_after(later.as_ref())?;
27 + builder.append_extension(BasicConstraints::new().critical().ca().build()?)?;
28 + builder.append_extension(
29 + SubjectKeyIdentifier::new().build(&builder.x509v3_context(None, None))?,
30 + )?;
31 + builder.append_extension(
32 + AuthorityKeyIdentifier::new()
33 + .keyid(true)
34 + .issuer(true)
35 + .build(&builder.x509v3_context(None, None))?,
36 + )?;
37 + builder.sign(&pkey, openssl::hash::MessageDigest::sha256())?;
38 + let c = builder.build();
39 + Ok((c.to_pem()?, pkey.private_key_to_pem_pkcs8()?))
40 + };
41 + let (pem_certificate, pem_private_key) = cert_result
42 + .as_ref()
43 + .map_err(|e| anyhow::anyhow!("Could not generate self-signed certificates: {}", e))?;
44 +
45 + Ok((pem_certificate, pem_private_key))
46 +}
src/handle_session.rs new
+123
@@ -0,0 +1,123 @@
1 +use futures::{SinkExt, StreamExt, stream::iter};
2 +use tokio::net::TcpStream;
3 +use tokio_util::codec::{Framed, LinesCodec, LinesCodecError};
4 +
5 +use crate::send_commands::send_commands;
6 +
7 +enum SmtpState {
8 + Command,
9 + Data,
10 + Quit,
11 +}
12 +
13 +pub async fn handle_session(mut stream: TcpStream) -> anyhow::Result<()> {
14 + let RE_SMTP_MAIL = regex::Regex::new(r"(?i)from: ?<(.+)>").unwrap();
15 + let RE_SMTP_RCPT = regex::Regex::new(r"(?i)to: ?<(.+)>").unwrap();
16 + let mut message = String::new();
17 + let mut state = SmtpState::Command;
18 + let mut mailfrom: Option<String> = None;
19 + let mut rcpts: Vec<String> = Vec::new();
20 + let mut framed = Framed::new(stream, LinesCodec::new());
21 + while let Some(line_str) = framed.next().await {
22 + let line = line_str?;
23 + match state {
24 + SmtpState::Command => {
25 + let space_pos = line.find(" ").unwrap_or(line.len());
26 + let (command, arg) = line.split_at(space_pos);
27 + let arg = arg.trim();
28 + match &*command.trim().to_uppercase() {
29 + "HELO" | "EHLO" => {
30 + send_commands(&mut framed, vec!["250 Hello".to_string()]).await?;
31 + }
32 + "MAIL" => {
33 + // Handle MAIL FROM command
34 + if let Some(address) = RE_SMTP_MAIL.captures(arg).and_then(|cap| cap.get(1))
35 + {
36 + mailfrom = Some(address.as_str().to_string());
37 + send_commands(&mut framed, vec!["250 OK".to_string()]).await?;
38 + } else {
39 + send_commands(
40 + &mut framed,
41 + vec!["501 Syntax: MAIL From: <address>".to_string()],
42 + )
43 + .await?;
44 + }
45 + }
46 + "RCPT" => {
47 + // Handle RCPT TO command
48 + if mailfrom.is_none() {
49 + send_commands(
50 + &mut framed,
51 + vec!["503 Error: Send MAIL first".to_string()],
52 + )
53 + .await?;
54 + } else {
55 + if let Some(address) =
56 + RE_SMTP_RCPT.captures(arg).and_then(|cap| cap.get(1))
57 + {
58 + rcpts.push(address.as_str().to_string());
59 + send_commands(&mut framed, vec!["250 OK".to_string()]).await?;
60 + } else {
61 + send_commands(
62 + &mut framed,
63 + vec!["501 Syntax: RCPT TO: <address>".to_string()],
64 + )
65 + .await?;
66 + }
67 + }
68 + }
69 + "DATA" => {
70 + if rcpts.is_empty() {
71 + send_commands(&mut framed, vec!["503 Error: MAIL FROM and RCPT TO must be set before sending DATA".to_string()]).await?;
72 + } else {
73 + state = SmtpState::Data;
74 + send_commands(
75 + &mut framed,
76 + vec!["354 End data with <CR><LF>.<CR><LF>".to_string()],
77 + )
78 + .await?;
79 + }
80 + }
81 + "NOOP" => {
82 + send_commands(&mut framed, vec!["250 OK".to_string()]).await?;
83 + }
84 + "RSET" => {
85 + mailfrom = None;
86 + rcpts = Vec::new();
87 + message = String::new();
88 + send_commands(&mut framed, vec!["250 OK".to_string()]).await?;
89 + }
90 + "QUIT" => {
91 + send_commands(&mut framed, vec!["221 Bye".to_string()]).await?;
92 + state = SmtpState::Quit;
93 + }
94 + _ => {
95 + send_commands(&mut framed, vec!["500 Unknown command".to_string()]).await?;
96 + }
97 + }
98 + }
99 + SmtpState::Data => {
100 + if line.trim() == "." {
101 + // The end of the email content has been received
102 + send_commands(&mut framed, vec!["250 OK".to_string()]).await?;
103 + // reset the state and variables for the next email
104 + mailfrom = None;
105 + rcpts = Vec::new();
106 + message = String::new();
107 + state = SmtpState::Command;
108 + // we can now handle the email:
109 + //handle_email(mailfrom, rcpts, message);
110 + panic!()
111 + } else {
112 + // Add the received line to the email content
113 + message.push_str(&line);
114 + message.push_str("\n");
115 + }
116 + }
117 + SmtpState::Quit => {
118 + break;
119 + }
120 + }
121 + }
122 + Ok(())
123 +}
src/handle_starttls.rs new
+24
@@ -0,0 +1,24 @@
1 +use native_tls::{Identity, TlsAcceptor};
2 +use tokio::net::TcpStream;
3 +use tokio_native_tls::{TlsAcceptor as TokioTlsAcceptor, TlsStream};
4 +
5 +use crate::{generate_certificate::generate_certificate, handle_session::handle_session};
6 +
7 +async fn handle_starttls(stream: &mut TcpStream) -> anyhow::Result<()> {
8 + // ideally the certificate should only be loaded from here and not generated each time
9 + let (pem_certificate, pem_private_key) = generate_certificate()?;
10 + let identity = Identity::from_pkcs8(&pem_certificate, &pem_private_key)?;
11 + let tls_acceptor = TlsAcceptor::builder(identity).build()?;
12 + let tls_acceptor = TokioTlsAcceptor::from(tls_acceptor);
13 +
14 + match tls_acceptor.accept(stream).await {
15 + Ok(stream) => {
16 + // we can now handle the normal SMTP session
17 + handle_session(stream).await?;
18 + }
19 + Err(e) => {
20 + tracing::error!("Error establishing SMTP TLS connection: {:?}", e);
21 + }
22 + };
23 + Ok(())
24 +}
src/handle_unsecured_session.rs new
+58
@@ -0,0 +1,58 @@
1 +use tokio::{
2 + io::{AsyncBufReadExt, AsyncWriteExt, BufReader, BufWriter},
3 + net::TcpStream,
4 +};
5 +
6 +use crate::handle_starttls;
7 +
8 +async fn handle_unsecured_session(
9 + reader: &mut BufReader<TcpStream>,
10 + writer: &mut BufWriter<TcpStream>,
11 +) -> anyhow::Result<()> {
12 + let mut is_tls = false;
13 + let mut line = String::new();
14 + while reader.read_line(&mut line).await? != 0 {
15 + let space_pos = line.find(" ").unwrap_or(line.len());
16 + let (command, _) = line.split_at(space_pos);
17 +
18 + match command.trim().to_uppercase().as_ref() {
19 + "EHLO" | "HELO" => {
20 + writer.write_all(b"250-windmill Hello\r\n").await?;
21 + writer.write_all(b"250-STARTTLS\r\n").await?;
22 + writer.write_all(b"250 What you've got?\r\n").await?;
23 + writer.flush().await?;
24 + }
25 + "STARTTLS" => {
26 + writer.write_all(b"220 GO ON\r\n").await?;
27 + writer.flush().await?;
28 + is_tls = true;
29 + break;
30 + }
31 + "QUIT" => {
32 + writer.write_all(b"221 Have a nice day!\r\n").await?;
33 + writer.flush().await?;
34 + break;
35 + }
36 + "NOOP" => {
37 + writer.write_all(b"250 OK\r\n").await?;
38 + writer.flush().await?;
39 + }
40 + "MAIL" | "RCPT" | "DATA" | "RSET" => {
41 + writer
42 + .write_all(b"530 Must issue a STARTTLS command first\r\n")
43 + .await?;
44 + writer.flush().await?;
45 + }
46 + _ => {
47 + writer.write_all(b"500 Unknown command\r\n").await?;
48 + writer.flush().await?;
49 + }
50 + }
51 +
52 + line.clear();
53 + }
54 +
55 + if is_tls {
56 + handle_starttls(stream).await?
57 + }
58 +}
src/lib.rs new
+6
@@ -0,0 +1,6 @@
1 +pub mod generate_certificate;
2 +pub mod handle_session;
3 +pub mod handle_starttls;
4 +pub mod handle_unsecured_session;
5 +pub mod listen;
6 +pub mod send_commands;
src/listen.rs new
+39
@@ -0,0 +1,39 @@
1 +use std::net::SocketAddr;
2 +use tokio::io::{AsyncWriteExt, BufReader, BufWriter};
3 +use tokio::net::{TcpListener, TcpStream};
4 +
5 +//use crate::handle_session::handle_session;
6 +
7 +pub async fn listen() -> anyhow::Result<()> {
8 + let addr = SocketAddr::from(([127, 0, 0, 1], 2525));
9 + let listener = TcpListener::bind(addr).await?;
10 +
11 + tracing::info!("SMTP server listening on {}", addr);
12 +
13 + loop {
14 + match listener.accept().await {
15 + Ok((mut stream, _)) => {
16 + tokio::spawn(async move {
17 + if let Err(err) = handle_connection(&mut stream).await {
18 + tracing::error!("Error handling SMTP connection: {:?}", err);
19 + };
20 + });
21 + }
22 + Err(err) => {
23 + tracing::error!("Error establishing SMTP connection: {:?}", err);
24 + }
25 + }
26 + }
27 +}
28 +
29 +async fn handle_connection(stream: &mut TcpStream) -> anyhow::Result<()> {
30 + let (reader, writer) = stream.split();
31 + let mut reader = BufReader::new(reader);
32 + let mut writer = BufWriter::new(writer);
33 + writer.write_all(b"220 My SMTP server\r\n").await?;
34 + writer.flush().await?;
35 +
36 + // handle session
37 + // handle_session(stream).await
38 + Ok(())
39 +}
src/main.rs new
+7
@@ -0,0 +1,7 @@
1 +use anyhow::Result;
2 +use smbcloud_mail::listen::listen;
3 +
4 +#[tokio::main]
5 +async fn main() -> Result<()> {
6 + listen().await
7 +}
src/send_commands.rs new
+14
@@ -0,0 +1,14 @@
1 +use futures::{SinkExt, StreamExt, stream::iter};
2 +use tokio::net::TcpStream;
3 +use tokio_native_tls::TlsStream;
4 +use tokio_util::codec::{Framed, LinesCodec};
5 +
6 +pub async fn send_commands(
7 + framed: &mut Framed<TcpStream, LinesCodec>,
8 + commands: Vec<String>,
9 +) -> anyhow::Result<()> {
10 + // only need to add \r because the codec only adds \n
11 + let messages = iter(commands.into_iter().map(|x| format!("{}\r", x)));
12 + framed.send_all(&mut messages.map(Ok)).await?;
13 + Ok(())
14 +}