140 lines
4.2 KiB
Rust
140 lines
4.2 KiB
Rust
use std::collections::HashMap;
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use std::sync::{Arc, RwLock};
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use crate::cert_store::CertBundle;
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/// Dynamic SNI-based certificate resolver.
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/// Used by the TLS stack to select the right certificate based on client SNI.
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pub struct SniResolver {
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/// Domain -> certificate bundle mapping
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certs: RwLock<HashMap<String, Arc<CertBundle>>>,
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/// Fallback certificate (used when no SNI or no match)
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fallback: RwLock<Option<Arc<CertBundle>>>,
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}
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impl SniResolver {
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pub fn new() -> Self {
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Self {
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certs: RwLock::new(HashMap::new()),
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fallback: RwLock::new(None),
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}
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}
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/// Register a certificate for a domain.
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pub fn add_cert(&self, domain: String, bundle: CertBundle) {
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let mut certs = self.certs.write().unwrap();
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certs.insert(domain, Arc::new(bundle));
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}
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/// Set the fallback certificate.
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pub fn set_fallback(&self, bundle: CertBundle) {
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let mut fallback = self.fallback.write().unwrap();
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*fallback = Some(Arc::new(bundle));
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}
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/// Resolve a certificate for the given SNI domain.
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pub fn resolve(&self, domain: &str) -> Option<Arc<CertBundle>> {
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let certs = self.certs.read().unwrap();
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// Try exact match
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if let Some(bundle) = certs.get(domain) {
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return Some(Arc::clone(bundle));
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}
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// Try wildcard match (e.g., *.example.com)
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if let Some(dot_pos) = domain.find('.') {
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let wildcard = format!("*.{}", &domain[dot_pos + 1..]);
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if let Some(bundle) = certs.get(&wildcard) {
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return Some(Arc::clone(bundle));
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}
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}
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// Fallback
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let fallback = self.fallback.read().unwrap();
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fallback.clone()
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}
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/// Remove a certificate for a domain.
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pub fn remove_cert(&self, domain: &str) {
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let mut certs = self.certs.write().unwrap();
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certs.remove(domain);
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}
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/// Get the number of registered certificates.
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pub fn cert_count(&self) -> usize {
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self.certs.read().unwrap().len()
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}
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}
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impl Default for SniResolver {
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fn default() -> Self {
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Self::new()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::cert_store::{CertBundle, CertMetadata, CertSource};
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fn make_bundle(domain: &str) -> CertBundle {
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CertBundle {
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key_pem: format!("KEY-{}", domain),
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cert_pem: format!("CERT-{}", domain),
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ca_pem: None,
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metadata: CertMetadata {
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domain: domain.to_string(),
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source: CertSource::Static,
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issued_at: 0,
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expires_at: 0,
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renewed_at: None,
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},
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}
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}
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#[test]
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fn test_exact_domain_resolve() {
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let resolver = SniResolver::new();
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resolver.add_cert("example.com".to_string(), make_bundle("example.com"));
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let result = resolver.resolve("example.com");
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assert!(result.is_some());
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assert_eq!(result.unwrap().cert_pem, "CERT-example.com");
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}
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#[test]
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fn test_wildcard_resolve() {
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let resolver = SniResolver::new();
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resolver.add_cert("*.example.com".to_string(), make_bundle("*.example.com"));
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let result = resolver.resolve("sub.example.com");
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assert!(result.is_some());
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assert_eq!(result.unwrap().cert_pem, "CERT-*.example.com");
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}
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#[test]
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fn test_fallback() {
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let resolver = SniResolver::new();
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resolver.set_fallback(make_bundle("fallback"));
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let result = resolver.resolve("unknown.com");
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assert!(result.is_some());
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assert_eq!(result.unwrap().cert_pem, "CERT-fallback");
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}
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#[test]
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fn test_no_match_no_fallback() {
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let resolver = SniResolver::new();
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resolver.add_cert("example.com".to_string(), make_bundle("example.com"));
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let result = resolver.resolve("other.com");
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assert!(result.is_none());
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}
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#[test]
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fn test_remove_cert() {
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let resolver = SniResolver::new();
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resolver.add_cert("example.com".to_string(), make_bundle("example.com"));
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assert_eq!(resolver.cert_count(), 1);
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resolver.remove_cert("example.com");
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assert_eq!(resolver.cert_count(), 0);
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assert!(resolver.resolve("example.com").is_none());
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}
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}
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