diff --git a/filtermail/Cargo.lock b/filtermail/Cargo.lock
index 88642f56..fa4ccd03 100644
--- a/filtermail/Cargo.lock
+++ b/filtermail/Cargo.lock
@@ -78,18 +78,39 @@ dependencies = [
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]
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@@ -102,6 +123,16 @@ version = "1.11.0"
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checksum = "b35204fbdc0b3f4446b89fc1ac2cf84a8a68971995d0bf2e925ec7cd960f9cb3"
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+ "find-msvc-tools",
+ "shlex",
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+ "cpufeatures",
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checksum = "d7a1e2f27636f116493b8b860f5546edb47c8d8f8ea73e1d2a20be88e28d1fea"
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+ "serde",
+ "sha2",
+ "subtle",
+ "zeroize",
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[[package]]
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version = "0.8.35"
@@ -159,6 +323,18 @@ dependencies = [
"cfg-if",
]
+[[package]]
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+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
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[[package]]
name = "env_filter"
version = "1.0.0"
@@ -198,6 +374,12 @@ dependencies = [
"windows-sys 0.61.2",
]
+[[package]]
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+
[[package]]
name = "filtermail"
version = "0.3.0"
@@ -206,28 +388,62 @@ dependencies = [
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"env_logger",
"governor",
+ "hickory-resolver",
"log",
+ "lru",
"mailparse",
+ "parking_lot",
"rstest",
"serde",
"serini",
"testresult",
"thiserror",
"tokio",
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]
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+
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@@ -272,6 +488,27 @@ dependencies = [
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]
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
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name = "getrandom"
version = "0.3.4"
@@ -303,13 +540,13 @@ dependencies = [
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"futures-timer",
"futures-util",
- "getrandom",
+ "getrandom 0.3.4",
"hashbrown 0.16.1",
"nonzero_ext",
"parking_lot",
"portable-atomic",
"quanta",
- "rand",
+ "rand 0.9.2",
"smallvec",
"spinning_top",
"web-time",
@@ -332,6 +569,170 @@ dependencies = [
"foldhash",
]
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@@ -342,6 +743,24 @@ dependencies = [
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]
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@@ -382,12 +801,33 @@ dependencies = [
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@@ -431,17 +880,84 @@ dependencies = [
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diff --git a/filtermail/LICENSE-GPL b/filtermail/LICENSE-GPL
new file mode 100644
index 00000000..f288702d
--- /dev/null
+++ b/filtermail/LICENSE-GPL
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+ (at your option) any later version.
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+if any, to sign a "copyright disclaimer" for the program, if necessary.
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+.
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+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License. But first, please read
+.
diff --git a/filtermail/README.md b/filtermail/README.md
index 5e37f97c..e7eeac39 100644
--- a/filtermail/README.md
+++ b/filtermail/README.md
@@ -7,3 +7,9 @@ Rust drop-in reimplementation of chatmaild's filtermail.
```plain
filtermail (incoming|outgoing)
```
+
+## License
+
+Code licensed under [MIT](LICENSE).
+
+Binaries distributed under [GPL-3.0-or-later](LICENSE).
diff --git a/filtermail/src/config.rs b/filtermail/src/config.rs
index 96f7f08e..f6f52909 100644
--- a/filtermail/src/config.rs
+++ b/filtermail/src/config.rs
@@ -25,7 +25,7 @@ pub struct Config {
pub passthrough_senders: Vec,
#[serde(default, deserialize_with = "deserialize_sequence")]
pub passthrough_recipients: Vec,
- mail_domain: String,
+ pub mail_domain: String,
mailboxes_dir: Option,
}
diff --git a/filtermail/src/dkim_verifier.rs b/filtermail/src/dkim_verifier.rs
new file mode 100644
index 00000000..c8ffdaf4
--- /dev/null
+++ b/filtermail/src/dkim_verifier.rs
@@ -0,0 +1,221 @@
+use crate::utils::get_domain_from_address;
+use hickory_resolver::name_server::TokioConnectionProvider;
+use hickory_resolver::{Name, TokioResolver};
+use lru::LruCache;
+use std::io;
+use std::num::NonZeroUsize;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::time::Duration;
+use viadkim::VerificationStatus;
+use viadkim::message_hash::BodyHasherStance;
+use viadkim::verifier::LookupTxt;
+
+// ~500kB when fully saturated (~420B per RDATA + selector).
+// "top 1000 relays" is much more than enough, the limit is mostly to prevent DoS attacks.
+const LRU_CACHE_CAPACITY: NonZeroUsize = NonZeroUsize::new(1000).expect("1000 != 0");
+
+/// DNS resolver for DKIM TXT records, that caches RDATA in memory.
+#[derive(Clone)]
+struct CachedResolver {
+ dns_resolver: TokioResolver,
+ // Note: Arc is required despite we are holding the whole handler in an Arc,
+ // because viadkim will internally clone the resolver (LookupTxt + Clone + 'static)
+ // to parallelize lookups in case of multiple signatures...
+ cache: Arc>>>,
+}
+
+impl CachedResolver {
+ /// Creates a new [`CachedResolver`].
+ pub fn new() -> Result {
+ // Use resolv.conf
+ let dns_resolver = TokioResolver::builder(TokioConnectionProvider::default())?.build();
+
+ let cache = Arc::new(parking_lot::Mutex::new(LruCache::new(LRU_CACHE_CAPACITY)));
+
+ Ok(Self {
+ dns_resolver,
+ cache,
+ })
+ }
+
+ /// Normalizes a TXT record RDATA by removing whitespace characters.
+ ///
+ /// Some DKIM key records use e.g. LF + WSP line breaks.
+ /// This is technically not correct, and `viadkim` fails to parse such records,
+ /// but in practice this is accepted by many implementations.
+ fn normalize_rdata(txt_data: &str) -> String {
+ txt_data.replace([' ', '\t', '\n', '\r'], "")
+ }
+
+ /// Invalidates the cached RDATA for a given selector and domain.
+ ///
+ /// Fails silently.
+ fn invalidate_cache(&self, selector: &str, domain: &str) {
+ let selector_domain_str = format!("{}._domainkey.{}.", selector, domain);
+ if let Ok(selector_domain) = Name::from_ascii(&selector_domain_str) {
+ let mut cache = self.cache.lock();
+ cache.pop(&selector_domain);
+ log::debug!("Cache invalidated for {}", selector_domain_str);
+ } else {
+ log::warn!(
+ "Failed to parse selector domain for cache invalidation: {}",
+ selector_domain_str
+ );
+ }
+ }
+}
+
+impl LookupTxt for CachedResolver {
+ type Answer = Box>>>;
+ type Query<'a> = Pin> + Send + 'a>>;
+
+ fn lookup_txt(&self, domain: &str) -> Self::Query<'_> {
+ let name = Name::from_ascii(domain);
+ Box::pin(async move {
+ let name = name.map_err(|_| io::ErrorKind::InvalidInput)?;
+
+ {
+ let mut cache = self.cache.lock();
+ if let Some(rdata) = cache.get(&name) {
+ let txts: Self::Answer = Box::new(std::iter::once(Ok(rdata.clone())));
+ log::debug!("Using cached RDATA for {}", name);
+ return Ok(txts);
+ }
+ }
+
+ log::debug!("Trying to resolve TXT for {}", name);
+ let txt = {
+ let lookup = self.dns_resolver.txt_lookup(name.clone()).await?;
+
+ // viadkim would filter out non-DKIM TXT records,
+ // but we filter it here anyway so that we know which one should be cached.
+ lookup
+ .into_iter()
+ .find_map(|txt| {
+ let rdata_raw = txt.txt_data().concat();
+ let rdata = String::from_utf8_lossy(&rdata_raw);
+ // naive check, but this can't be an attack vector,
+ // and selector domain should only have a single TXT record anyway.
+ if rdata.contains("DKIM") {
+ Some(Self::normalize_rdata(&rdata).into_bytes())
+ } else {
+ None
+ }
+ })
+ .ok_or(io::ErrorKind::NotFound)?
+ };
+
+ {
+ let mut cache = self.cache.lock();
+ cache.put(name, txt.clone());
+ }
+
+ let txts: Self::Answer = Box::new(std::iter::once(Ok(txt)));
+ Ok(txts)
+ })
+ }
+}
+
+/// DKIM verifier using a pre-configured [`viadkim`] verifier, a [`CachedResolver`] for DNS lookups,
+/// and strict domain name alignment check.
+pub struct DkimVerifier {
+ resolver: CachedResolver,
+ config: viadkim::Config,
+}
+
+impl DkimVerifier {
+ /// Creates a new [`DkimVerifier`] with the provided resolver.
+ pub fn new() -> Result {
+ let resolver = CachedResolver::new()?;
+ let config = viadkim::Config {
+ lookup_timeout: Duration::from_secs(60),
+ ..Default::default()
+ };
+ Ok(Self { resolver, config })
+ }
+
+ /// Verifies the DKIM signature of a raw email message and alignment with the domain of
+ /// provided `From` address.
+ pub async fn verify(&self, raw_mail: &[u8], from_address: &str) -> Result<(), String> {
+ let (headers, body_start) = {
+ use viadkim::{FieldBody, FieldName, HeaderField};
+
+ let Ok((headers, body_start)) = mailparse::parse_headers(raw_mail) else {
+ return Err("500 Failed to parse message headers".to_string());
+ };
+
+ let mut viadkim_headers: Vec = Vec::new();
+ for header in headers {
+ match (
+ FieldName::new(header.get_key()),
+ FieldBody::new(header.get_value_raw()),
+ ) {
+ (Ok(name), Ok(body)) => viadkim_headers.push((name, body)),
+ (Err(e), _) | (_, Err(e)) => {
+ log::debug!("Failed to parse header {header:?}, skipping: {e}");
+ }
+ }
+ }
+
+ let viadkim_headers = viadkim::HeaderFields::new(viadkim_headers).map_err(|e| {
+ log::error!("Failed to parse headers for DKIM verification: {e}");
+ "500 Failed to parse message headers".to_string()
+ })?;
+
+ (viadkim_headers, body_start)
+ };
+
+ let Some(from_domain) = get_domain_from_address(from_address) else {
+ return Err("501 Invalid From address".to_string());
+ };
+
+ log::debug!("`From` header domain: {from_domain}");
+
+ let Some(mut verifier) =
+ viadkim::Verifier::verify_header(&self.resolver, &headers, &self.config).await
+ else {
+ return Err("554 5.7.1 No DKIM signature found".to_string());
+ };
+
+ 'hasher: for chunk in raw_mail.get(body_start..).unwrap_or_default().chunks(8192) {
+ if verifier.process_body_chunk(chunk) == BodyHasherStance::Done {
+ break 'hasher;
+ }
+ }
+
+ for res in verifier.finish() {
+ log::debug!("Signature {}: {:?}", res.index, res.status);
+
+ let Some(signature) = &res.signature else {
+ log::debug!("Signature {}: No signature found, skipping", res.index);
+ continue;
+ };
+
+ if matches!(res.status, VerificationStatus::Failure(_)) {
+ log::debug!("Signature {}: Verification failed, skipping", res.index);
+ // We only invalidate cache on actual validation error, and not alignment error.
+ // TODO: ideally we should retry without cache and swap cached value only on success.
+ self.resolver
+ .invalidate_cache(signature.selector.as_ref(), signature.domain.as_ref());
+ continue;
+ }
+
+ if !signature
+ .domain
+ .to_string()
+ .eq_ignore_ascii_case(&from_domain)
+ {
+ log::debug!(
+ "Signature {}: Domain different than in From header, skipping",
+ res.index
+ );
+ continue;
+ }
+
+ return Ok(());
+ }
+
+ Err("554 5.7.1 No valid DKIM signature found".to_string())
+ }
+}
diff --git a/filtermail/src/error.rs b/filtermail/src/error.rs
index 76dd251d..b51d6c1c 100644
--- a/filtermail/src/error.rs
+++ b/filtermail/src/error.rs
@@ -8,6 +8,8 @@ pub enum Error {
Config(#[from] serini::Error),
#[error(transparent)]
Io(#[from] std::io::Error),
+ #[error(transparent)]
+ Resolve(#[from] hickory_resolver::ResolveError),
#[error("OpenPGP packet header is truncated - can't validate!")]
TruncatedHeader,
#[error("Unable to send email, Error during {context}, server said: {raw_smtp_answer}")]
diff --git a/filtermail/src/inbound.rs b/filtermail/src/inbound.rs
index 7d295b38..82757c6b 100644
--- a/filtermail/src/inbound.rs
+++ b/filtermail/src/inbound.rs
@@ -2,22 +2,26 @@
use crate::ENCRYPTION_NEEDED_523;
use crate::config::Config;
+use crate::dkim_verifier::DkimVerifier;
use crate::message::{check_encrypted, is_securejoin};
+pub use crate::smtp_server::Envelope;
use crate::smtp_server::SmtpHandler;
+use crate::utils::extract_address;
use async_trait::async_trait;
use mailparse::{MailHeaderMap, parse_mail};
-pub use crate::smtp_server::Envelope;
-use crate::utils::extract_address;
-
/// Handler for incoming SMTP messages.
pub struct IncomingBeforeQueueHandler {
config: Config,
+ dkim_verifier: DkimVerifier,
}
impl IncomingBeforeQueueHandler {
- pub fn new(config: Config) -> Self {
- Self { config }
+ pub fn new(config: Config) -> Result {
+ Ok(Self {
+ config,
+ dkim_verifier: DkimVerifier::new()?,
+ })
}
}
@@ -27,7 +31,7 @@ impl SmtpHandler for IncomingBeforeQueueHandler {
Ok(())
}
- fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
+ async fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
log::debug!("Processing DATA message from {}", envelope.mail_from);
let message = match parse_mail(&envelope.data) {
@@ -35,6 +39,21 @@ impl SmtpHandler for IncomingBeforeQueueHandler {
Err(e) => return Err(format!("500 Failed to parse message: {}", e)),
};
+ let from_header = message
+ .headers
+ .get_first_value("From")
+ .unwrap_or_default()
+ .trim()
+ .to_string();
+
+ let Some(from_addr) = extract_address(&from_header) else {
+ return Err(format!("500 Invalid FROM header: {from_header}"));
+ };
+
+ self.dkim_verifier
+ .verify(&envelope.data, &from_addr)
+ .await?;
+
let mail_encrypted = check_encrypted(&message, false);
log::debug!("mail_encrypted: {mail_encrypted}");
log::debug!("is_securejoin: {}", is_securejoin(&message));
@@ -50,20 +69,10 @@ impl SmtpHandler for IncomingBeforeQueueHandler {
// Allow cleartext mailer-daemon messages
if let Some(auto_submitted) = message.headers.get_first_value("Auto-Submitted")
&& !auto_submitted.is_empty()
+ && from_addr.to_lowercase().starts_with("mailer-daemon@")
+ && message.ctype.mimetype == "multipart/report"
{
- let from_header = message
- .headers
- .get_first_value("From")
- .unwrap_or_default()
- .trim()
- .to_string();
-
- if let Some(from_addr) = extract_address(&from_header)
- && from_addr.to_lowercase().starts_with("mailer-daemon@")
- && message.ctype.mimetype == "multipart/report"
- {
- return Ok(());
- }
+ return Ok(());
}
for recipient in &envelope.rcpt_to {
diff --git a/filtermail/src/main.rs b/filtermail/src/main.rs
index 62db8c79..ac30f2dc 100644
--- a/filtermail/src/main.rs
+++ b/filtermail/src/main.rs
@@ -25,6 +25,7 @@
clippy::bool_to_int_with_if
)]
mod config;
+mod dkim_verifier;
pub(crate) mod error;
pub(crate) mod inbound;
pub(crate) mod message;
@@ -95,7 +96,10 @@ async fn main() {
process::exit(1);
}
} else {
- let handler = Arc::new(IncomingBeforeQueueHandler::new(config.clone()));
+ let handler = Arc::new(
+ // We want to panic here if the handler cannot be created.
+ IncomingBeforeQueueHandler::new(config.clone()).unwrap(),
+ );
let addr = format!("127.0.0.1:{}", config.filtermail_smtp_port_incoming);
let max_size = config.max_message_size;
log::debug!("Incoming SMTP server listening on {addr}");
diff --git a/filtermail/src/outbound.rs b/filtermail/src/outbound.rs
index 22261aae..a6f4edbf 100644
--- a/filtermail/src/outbound.rs
+++ b/filtermail/src/outbound.rs
@@ -55,7 +55,7 @@ impl SmtpHandler for OutgoingBeforeQueueHandler {
Ok(())
}
- fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
+ async fn check_data(&self, envelope: &Envelope) -> Result<(), String> {
log::debug!("Processing DATA message from {}", envelope.mail_from);
let message = match parse_mail(&envelope.data) {
diff --git a/filtermail/src/smtp_server.rs b/filtermail/src/smtp_server.rs
index 04446c97..e5fd0198 100644
--- a/filtermail/src/smtp_server.rs
+++ b/filtermail/src/smtp_server.rs
@@ -21,7 +21,7 @@ pub trait SmtpHandler: Send + Sync {
fn handle_mail(&self, address: &str) -> Result<(), String>;
/// Checks the DATA command before reinjection.
- fn check_data(&self, envelope: &Envelope) -> Result<(), String>;
+ async fn check_data(&self, envelope: &Envelope) -> Result<(), String>;
/// Reinjects the mail back to postfix.
async fn reinject_mail(&self, envelope: &Envelope) -> Result<(), String>;
@@ -29,7 +29,7 @@ pub trait SmtpHandler: Send + Sync {
/// Handles the DATA command.
async fn handle_data(&self, envelope: &Envelope) -> Result {
log::debug!("handle_DATA before-queue");
- self.check_data(envelope)?;
+ self.check_data(envelope).await?;
self.reinject_mail(envelope).await.map_err(|e| {
log::warn!("Failed to reinject mail: {e}");
e
diff --git a/filtermail/src/utils.rs b/filtermail/src/utils.rs
index 563cad1e..3b221480 100644
--- a/filtermail/src/utils.rs
+++ b/filtermail/src/utils.rs
@@ -26,6 +26,17 @@ pub fn extract_address(input: &str) -> Option {
})
}
+pub fn get_domain_from_address(address: &str) -> Option {
+ let parts: Vec<&str> = address.split('@').collect();
+ if parts.len() == 2
+ && let Some(domain) = parts.get(1)
+ {
+ Some(domain.to_string())
+ } else {
+ None
+ }
+}
+
#[cfg(test)]
mod tests {
use super::*;
@@ -44,4 +55,14 @@ mod tests {
let result = extract_address(input);
assert_eq!(result, expected)
}
+
+ #[rstest]
+ #[case("t1@example.org", Some("example.org".to_string()))]
+ #[case("SRS1=HHH=example.com==HHH=TT=example.org=alice@example.net", Some("example.net".to_string()))]
+ #[case("invalid", None)]
+ #[case("invalid@address@com", None)]
+ fn test_get_domain_from_address(#[case] input: &str, #[case] expected: Option) {
+ let result = get_domain_from_address(input);
+ assert_eq!(result, expected);
+ }
}