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 = [ "syn", ] +[[package]] +name = "autocfg" +version = "1.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8" + [[package]] name = "base64" version = "0.22.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6" +[[package]] +name = "base64ct" +version = "1.8.3" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06" + [[package]] name = "bitflags" version = "2.10.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "812e12b5285cc515a9c72a5c1d3b6d46a19dac5acfef5265968c166106e31dd3" +[[package]] +name = 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"0.10.4" +viadkim = { version = "0.2.0" } +hickory-resolver = "0.25.2" +lru = "0.16.3" +parking_lot = "0.12.5" [dev-dependencies] rstest = "0.26.1" 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 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +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); + } }