sigp · petertdavies · May 5, 2022 · May 5, 2022 · May 10, 2022 · May 11, 2022
diff --git a/book/src/validator-web3signer.md b/book/src/validator-web3signer.md
@@ -43,12 +43,15 @@ remote signer:
   type: web3signer
   url: "https://my-remote-signer.com:1234"
   root_certificate_path: /home/paul/my-certificates/my-remote-signer.pem
+  client_identity_path: /home/paul/my-keys/my-identity-certificate.p12
+  client_identity_password: "password"
 ```
 
 When using this file, the Lighthouse VC will perform duties for the `0xa5566..` validator and defer
 to the `https://my-remote-signer.com:1234` server to obtain any signatures. It will load a
 "self-signed" SSL certificate from `/home/paul/my-certificates/my-remote-signer.pem` (on the
-filesystem of the VC) to encrypt the communications between the VC and Web3Signer.
+filesystem of the VC) to encrypt the communications between the VC and Web3Signer. It will use
+SSL client authentication with the "self-signed" certificate in `/home/paul/my-keys/my-identity-certificate.p12`.
 
 > The `request_timeout_ms` key can also be specified. Use this key to override the default timeout
 > with a new timeout in milliseconds. This is the timeout before requests to Web3Signer are

diff --git a/common/account_utils/src/validator_definitions.rs b/common/account_utils/src/validator_definitions.rs
@@ -72,6 +72,16 @@ pub enum SigningDefinition {
         /// The timeout is applied from when the request starts connecting until the response body has finished.
         #[serde(skip_serializing_if = "Option::is_none")]
         request_timeout_ms: Option<u64>,
+
+        /// Path to a PKCS12 file.
+        #[serde(skip_serializing_if = "Option::is_none")]
+        client_identity_path: Option<PathBuf>,
+
+        /// Password for the PKCS12 file.
+        ///
+        /// An empty password will be used if this is omitted.
+        #[serde(skip_serializing_if = "Option::is_none")]
+        client_identity_password: Option<String>,
     },
 }
 

diff --git a/common/eth2/src/lighthouse_vc/types.rs b/common/eth2/src/lighthouse_vc/types.rs
@@ -92,4 +92,8 @@ pub struct Web3SignerValidatorRequest {
     #[serde(default)]
     #[serde(skip_serializing_if = "Option::is_none")]
     pub request_timeout_ms: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub client_identity_path: Option<PathBuf>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub client_identity_password: Option<String>,
 }
diff --git a/testing/web3signer_tests/src/lib.rs b/testing/web3signer_tests/src/lib.rs
@@ -36,7 +36,9 @@ mod tests {
     use types::*;
     use url::Url;
     use validator_client::{
-        initialized_validators::{load_pem_certificate, InitializedValidators},
+        initialized_validators::{
+            load_pem_certificate, load_pkcs12_identity, InitializedValidators,
+        },
         validator_store::ValidatorStore,
         SlashingDatabase, SLASHING_PROTECTION_FILENAME,
     };
@@ -108,7 +110,18 @@ mod tests {
     }
 
     fn root_certificate_path() -> PathBuf {
-        tls_dir().join("cert.pem")
+        tls_dir().join("lighthouse").join("web3signer.pem")
+    }
+
+    fn client_identity_path() -> PathBuf {
+        tls_dir().join("lighthouse").join("key.p12")
+    }
+
+    fn client_identity_password() -> String {
+        fs::read_to_string(tls_dir().join("lighthouse").join("password.txt"))
+            .unwrap()
+            .trim()
+            .to_string()
     }
 
     /// A testing rig which holds a live Web3Signer process.
@@ -155,8 +168,9 @@ mod tests {
                 File::create(&keystore_dir.path().join("key-config.yaml")).unwrap();
             serde_yaml::to_writer(key_config_file, &key_config).unwrap();
 
-            let tls_keystore_file = tls_dir().join("key.p12");
-            let tls_keystore_password_file = tls_dir().join("password.txt");
+            let tls_keystore_file = tls_dir().join("web3signer").join("key.p12");
+            let tls_keystore_password_file = tls_dir().join("web3signer").join("password.txt");
+            let tls_known_clients_file = tls_dir().join("web3signer").join("known_clients.txt");
 
             let stdio = || {
                 if SUPPRESS_WEB3SIGNER_LOGS {
@@ -173,7 +187,10 @@ mod tests {
                 ))
                 .arg(format!("--http-listen-host={}", listen_address))
                 .arg(format!("--http-listen-port={}", listen_port))
-                .arg("--tls-allow-any-client=true")
+                .arg(format!(
+                    "--tls-known-clients-file={}",
+                    tls_known_clients_file.to_str().unwrap()
+                ))
                 .arg(format!(
                     "--tls-keystore-file={}",
                     tls_keystore_file.to_str().unwrap()
@@ -193,8 +210,11 @@ mod tests {
             let url = Url::parse(&format!("https://{}:{}", listen_address, listen_port)).unwrap();
 
             let certificate = load_pem_certificate(root_certificate_path()).unwrap();
+            let identity =
+                load_pkcs12_identity(client_identity_path(), &client_identity_password()).unwrap();
             let http_client = Client::builder()
                 .add_root_certificate(certificate)
+                .identity(identity)
                 .build()
                 .unwrap();
 
@@ -358,6 +378,8 @@ mod tests {
                         url: signer_rig.url.to_string(),
                         root_certificate_path: Some(root_certificate_path()),
                         request_timeout_ms: None,
+                        client_identity_path: Some(client_identity_path()),
+                        client_identity_password: Some(client_identity_password()),
                     },
                 };
                 ValidatorStoreRig::new(vec![validator_definition], spec).await

diff --git a/testing/web3signer_tests/tls/cert.pem b/testing/web3signer_tests/tls/cert.pem
diff --git a/testing/web3signer_tests/tls/generate.sh b/testing/web3signer_tests/tls/generate.sh
@@ -1,4 +1,7 @@
 #!/bin/bash
-openssl req -x509 -sha256 -nodes -days 36500 -newkey rsa:4096 -keyout key.key -out cert.pem -config config &&
-openssl pkcs12 -export -out key.p12 -inkey key.key -in cert.pem -password pass:$(cat password.txt)
-
+openssl req -x509 -sha256 -nodes -days 36500 -newkey rsa:4096 -keyout web3signer/key.key -out web3signer/cert.pem -config web3signer/config &&
+openssl pkcs12 -export -out web3signer/key.p12 -inkey web3signer/key.key -in web3signer/cert.pem -password pass:$(cat web3signer/password.txt) &&
+cp web3signer/cert.pem lighthouse/web3signer.pem &&
+openssl req -x509 -sha256 -nodes -days 36500 -newkey rsa:4096 -keyout lighthouse/key.key -out lighthouse/cert.pem -config lighthouse/config &&
+openssl pkcs12 -export -out lighthouse/key.p12 -inkey lighthouse/key.key -in lighthouse/cert.pem -password pass:$(cat lighthouse/password.txt) &&
+openssl x509 -noout -fingerprint -sha256 -inform pem -in lighthouse/cert.pem | cut -b 20-| sed "s/^/lighthouse /" > web3signer/known_clients.txt
diff --git a/testing/web3signer_tests/tls/key.key b/testing/web3signer_tests/tls/key.key
diff --git a/testing/web3signer_tests/tls/key.p12 b/testing/web3signer_tests/tls/key.p12
diff --git a/testing/web3signer_tests/tls/lighthouse/cert.pem b/testing/web3signer_tests/tls/lighthouse/cert.pem
@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
+MIIFmzCCA4OgAwIBAgIUXpTV/0rd/GAoCfCyzPOtwcb4t7YwDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----
diff --git a/testing/web3signer_tests/tls/config → ...ng/web3signer_tests/tls/lighthouse/config b/testing/web3signer_tests/tls/config → ...ng/web3signer_tests/tls/lighthouse/config
@@ -10,7 +10,7 @@ ST = VA
 L = SomeCity
 O = MyCompany
 OU = MyDivision
-CN = 127.0.0.1
+CN = lighthouse
 [v3_req]
 keyUsage = keyEncipherment, dataEncipherment
 extendedKeyUsage = serverAuth

diff --git a/testing/web3signer_tests/tls/lighthouse/key.key b/testing/web3signer_tests/tls/lighthouse/key.key
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
diff --git a/testing/web3signer_tests/tls/lighthouse/key.p12 b/testing/web3signer_tests/tls/lighthouse/key.p12
diff --git a/testing/web3signer_tests/tls/lighthouse/password.txt b/testing/web3signer_tests/tls/lighthouse/password.txt
@@ -0,0 +1 @@
+bark
diff --git a/testing/web3signer_tests/tls/lighthouse/web3signer.pem b/testing/web3signer_tests/tls/lighthouse/web3signer.pem
@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----