Cargo.lock

@@ -890,6 +890,7 @@ dependencies = [
  "tokio",
  "tokio-rustls 0.26.0",
  "url",
+ "webpki-roots",
 ]
 
 [[package]]
@@ -1111,6 +1112,15 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "webpki-roots"
+version = "0.26.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd7c23921eeb1713a4e851530e9b9756e4fb0e89978582942612524cf09f01cd"
+dependencies = [
+ "rustls-pki-types",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"

Cargo.toml

@@ -21,6 +21,7 @@ url = "2.5.2"
 
 tokio = { version = "1.39.2", features = ["io-util", "net"] }
 tokio-rustls = { version = "0.26.0", default-features = false, features = ["ring"] }
+webpki-roots = { version = "0.26.3", optional = true }
 
 dashmap = { version = "6.0.1", optional = true }
 hickory-client = { version = "0.24.1", optional = true }
@@ -29,9 +30,9 @@ hickory-client = { version = "0.24.1", optional = true }
 tokio = { version = "1.39.2", features = ["macros", "rt-multi-thread"] }
 
 [features]
+webpki = ["dep:webpki-roots"]
 file-sscv = ["dep:dashmap", "tokio/fs"]
 
-dane = ["hickory"]
 hickory = ["dep:hickory-client"]
 hickory-dot = ["hickory", "hickory-client/dns-over-rustls"]
 hickory-doh = ["hickory", "hickory-client/dns-over-https-rustls"]
@@ -45,4 +46,9 @@ path = "examples/simple.rs"
 [[example]]
 name = "main"
 path = "examples/main.rs"
-required-features = ["file-sscv", "hickory"]
+required-features = ["file-sscv"]
+
+[[example]]
+name = "dane"
+path = "examples/dane.rs"
+required-features = ["hickory"]

examples/dane.rs

@@ -0,0 +1,16 @@
+use tokio_gemini::dns::DnsClient;
+
+#[tokio::main]
+async fn main() {
+    let mut client = DnsClient::init(("1.1.1.1", 53)).await.unwrap();
+    println!(
+        "{}",
+        client
+            .query_tlsa("torproject.org", 443)
+            .await
+            .unwrap()
+            .next()
+            .unwrap()
+            .hex()
+    );
+}

examples/main.rs

@@ -1,30 +1,38 @@
-use tokio_gemini::{
-    certs::{file_sscv::FileBasedCertVerifier, insecure::AllowAllCertVerifier},
-    dns::DnsClient,
-    Client, LibError,
-};
+use tokio_gemini::certs::{file_sscv::FileBasedCertVerifier, insecure::AllowAllCertVerifier};
 
 //
-// cargo add tokio_gemini -F file-sscv,hickory
+// cargo add tokio_gemini -F file-sscv
 // cargo add tokio -F macros,rt-multi-thread,io-util,fs
 //
 
-const USAGE: &str = "-k\t\tinsecure mode (trust all certs)
--d <DNS server addr>\tuse custom DNS for resolving & DANE
--h\t\tshow help";
-
-struct Config {
-    insecure: bool,
-    dns: Option<String>,
-    url: String,
+#[tokio::main]
+async fn main() -> Result<(), tokio_gemini::LibError> {
+    let mut args = std::env::args();
+    let mut insecure = false;
+    let mut url = "gemini://geminiprotocol.net/".to_owned();
+    _ = args.next(); // skip exe path
+    if let Some(arg) = args.next() {
+        if arg == "-k" {
+            insecure = true;
+            if let Some(arg) = args.next() {
+                url = arg;
+            }
+        } else {
+            url = arg;
+        }
     }
 
-#[tokio::main]
-async fn main() -> Result<(), LibError> {
-    let config = parse_args();
-    let client = build_client(&config).await?;
+    let client = if insecure {
+        tokio_gemini::Client::builder()
+            .with_custom_verifier(AllowAllCertVerifier::yes_i_know_what_i_am_doing())
+            .build()
+    } else {
+        tokio_gemini::Client::builder()
+            .with_selfsigned_cert_verifier(FileBasedCertVerifier::init("known_hosts").await?)
+            .build()
+    };
 
-    let mut resp = client.request(&config.url).await?;
+    let mut resp = client.request(&url).await?;
 
     {
         let status_code = resp.status().status_code();
@@ -49,66 +57,3 @@ async fn main() -> Result<(), LibError> {
 
     Ok(())
 }
-
-fn parse_args() -> Config {
-    let mut config = Config {
-        insecure: false,
-        dns: None,
-        url: "gemini://geminiprotocol.net/".to_owned(),
-    };
-
-    let mut expected_dns = false;
-
-    for arg in std::env::args().skip(1) {
-        match arg.as_str() {
-            dns if expected_dns => {
-                config.dns = Some(dns.to_owned());
-                expected_dns = false;
-            }
-            "-k" => config.insecure = true,
-            "-d" => expected_dns = true,
-            "-h" => {
-                println!("{}", USAGE);
-                std::process::exit(0);
-            }
-            url => {
-                println!("URL: {}", url);
-                config.url = url.to_owned();
-                break;
-            }
-        }
-    }
-
-    if expected_dns {
-        println!("{}", USAGE);
-        std::process::exit(0);
-    }
-
-    config
-}
-
-async fn build_client(config: &Config) -> Result<Client, LibError> {
-    let dns = if let Some(addr) = &config.dns {
-        Some(DnsClient::init(addr).await?)
-    } else {
-        None
-    };
-
-    let client = tokio_gemini::Client::builder();
-
-    let client = if config.insecure {
-        client.with_custom_verifier(AllowAllCertVerifier::yes_i_know_what_i_am_doing())
-    } else {
-        client.with_selfsigned_cert_verifier(
-            FileBasedCertVerifier::init("known_hosts", dns.clone()).await?,
-        )
-    };
-
-    let client = if let Some(dns) = dns {
-        client.with_dns_client(dns)
-    } else {
-        client
-    };
-
-    Ok(client.build())
-}

src/certs/file_sscv.rs

@@ -15,21 +15,15 @@ use crate::{
     LibError,
 };
 
-#[cfg(feature = "hickory")]
-use crate::dns::DnsClient;
-
 pub struct FileBasedCertVerifier {
     fd: Mutex<std::os::fd::OwnedFd>,
     map: DashMap<String, SelfsignedCert>,
     #[cfg(feature = "hickory")]
-    dns: Option<DnsClient>,
+    dns: Option<crate::dns::DnsClient>,
 }
 
 impl FileBasedCertVerifier {
-    pub async fn init(
-        path: impl AsRef<Path>,
-        #[cfg(feature = "hickory")] dns: Option<DnsClient>,
-    ) -> Result<Self, LibError> {
+    pub async fn init(path: impl AsRef<Path>) -> Result<Self, LibError> {
         let map = DashMap::new();
 
         if tokio::fs::try_exists(&path).await? {
@@ -103,7 +97,7 @@ impl FileBasedCertVerifier {
             fd,
             map,
             #[cfg(feature = "hickory")]
-            dns,
+            dns: None,
         })
     }
 }

src/certs/verifier.rs

@@ -15,6 +15,8 @@ use tokio_rustls::rustls::{
 
 pub struct CustomCertVerifier {
     pub(crate) provider: Arc<rustls::crypto::CryptoProvider>,
+    pub(crate) webpki_verifier: Option<Arc<rustls::client::WebPkiServerVerifier>>,
+    pub(crate) ss_allowed: bool,
     pub(crate) ss_verifier: Box<dyn SelfsignedCertVerifier>,
 }
 
@@ -27,20 +29,52 @@ impl ServerCertVerifier for CustomCertVerifier {
         _ocsp_response: &[u8],
         now: UnixTime,
     ) -> Result<ServerCertVerified, rustls::Error> {
-        // TODO: certificate validation (domain, expiry, etc.)
+        // if webpki CA certs enabled
+        #[cfg(feature = "webpki")]
+        if let Some(wv) = &self.webpki_verifier {
+            match wv.verify_server_cert(
+                end_entity,
+                _intermediates,
+                server_name,
+                _ocsp_response,
+                now,
+            ) {
+                Ok(verified) => {
+                    return Ok(verified);
+                }
+                Err(
+                    e @ rustls::Error::InvalidCertificate(rustls::CertificateError::UnknownIssuer),
+                ) => {
+                    if !self.ss_allowed {
+                        return Err(e);
+                    }
+                    // go ahead, verify as self-signed
+                }
+                Err(e) => {
+                    // any other error, probably related to invalid cert
+                    return Err(e);
+                }
+            }
+        }
 
+        // TODO: certificate validation when webpki_verifier is not used
+
+        // if self-signed certs enabled
+        if self.ss_allowed {
+            // TODO: check if expired or provide handy API to check it
+            // (probably with rustls-webpki's webpki::Cert)
             if self
                 .ss_verifier
                 .verify(end_entity, server_name.to_str().as_ref(), now)?
             {
-            Ok(ServerCertVerified::assertion())
-        } else {
-            Err(rustls::Error::InvalidCertificate(
-                rustls::CertificateError::ApplicationVerificationFailure,
-            ))
+                return Ok(ServerCertVerified::assertion());
             }
         }
 
+        // both disabled (shouldn't happen)
+        Err(rustls::Error::UnsupportedNameType) // not sure if chosen correct enum item
+    }
+
     fn verify_tls12_signature(
         &self,
         message: &[u8],
@@ -78,6 +112,10 @@ impl ServerCertVerifier for CustomCertVerifier {
 
 impl std::fmt::Debug for CustomCertVerifier {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "CustomCertVerifier {{ provider: {:?} }}", self.provider)
+        write!(
+            f,
+            "CustomCertVerifier {{ provider: {:?}, webpki_verifier: {:?} }}",
+            self.provider, self.webpki_verifier
+        )
     }
 }

src/client/builder.rs

@@ -12,6 +12,9 @@ use crate::dns::DnsClient;
 
 use tokio_rustls::rustls::{self, client::danger::ServerCertVerifier, SupportedProtocolVersion};
 
+#[cfg(feature = "webpki")]
+use tokio_rustls::rustls::{client::WebPkiServerVerifier, pki_types::TrustAnchor};
+
 /// Builder for creating configured [`Client`] instance
 pub struct ClientBuilder {
     root_certs: rustls::RootCertStore,
@@ -60,10 +63,33 @@ impl ClientBuilder {
         let tls_config = if let Some(cv) = self.custom_verifier {
             tls_config.dangerous().with_custom_certificate_verifier(cv)
         } else if let Some(ssv) = self.ss_verifier {
+            let webpki_verifier = {
+                #[cfg(feature = "webpki")]
+                if !self.root_certs.is_empty() {
+                    Some(
+                        WebPkiServerVerifier::builder_with_provider(
+                            Arc::new(self.root_certs),
+                            provider.clone(),
+                        )
+                        .build()
+                        // panics only if roots are empty (that is checked above)
+                        // or CRLs couldn't be parsed (we didn't provide any)
+                        .unwrap(),
+                    )
+                } else {
+                    None
+                }
+
+                #[cfg(not(feature = "webpki"))]
+                None
+            };
+
             tls_config
                 .dangerous()
                 .with_custom_certificate_verifier(Arc::new(CustomCertVerifier {
                     provider: provider.clone(),
+                    webpki_verifier,
+                    ss_allowed: true,
                     ss_verifier: ssv,
                 }))
         } else {
@@ -91,6 +117,27 @@ impl ClientBuilder {
         self
     }
 
+    /// Include webpki trust anchors.
+    /// Not recommended (useless) as most Gemini capsules use self-signed
+    /// TLS certs and properly configured TOFU policy is enough.
+    #[cfg(feature = "webpki")]
+    pub fn with_webpki_roots(mut self) -> Self {
+        self.root_certs
+            .extend(webpki_roots::TLS_SERVER_ROOTS.iter().cloned());
+        self
+    }
+
+    /// Include custom trust anchors.
+    /// Not recommended (useless), see note for [`ClientBuilder::with_webpki_roots`].
+    #[cfg(feature = "webpki")]
+    pub fn with_custom_roots(
+        mut self,
+        iter: impl IntoIterator<Item = TrustAnchor<'static>>,
+    ) -> Self {
+        self.root_certs.extend(iter);
+        self
+    }
+
     /// Include a self-signed cert verifier.
     /// If you only need a known_hosts file, consider using
     /// [`crate::certs::file_sscv::FileBasedCertVerifier`],

src/client/mod.rs

@@ -7,14 +7,16 @@ pub use response::Response;
 
 #[cfg(feature = "hickory")]
 use crate::dns::DnsClient;
+
 #[cfg(feature = "hickory")]
 use hickory_client::rr::IntoName;
-#[cfg(feature = "hickory")]
-use std::net::SocketAddr;
 
 use crate::{error::*, status::*};
 use builder::ClientBuilder;
 
+#[cfg(feature = "hickory")]
+use std::net::SocketAddr;
+
 use std::sync::Arc;
 
 use tokio::{
@@ -47,8 +49,6 @@ impl From<rustls::ClientConfig> for Client {
 
 #[cfg(feature = "hickory")]
 impl From<(rustls::ClientConfig, DnsClient)> for Client {
-    /// Create a Client from a Rustls config and
-    /// a DnsClient instance as a custom resolver.
     #[inline]
     fn from(value: (rustls::ClientConfig, DnsClient)) -> Self {
         Client {