Add client authentication to Web3Signer validators (#3170)

## Issue Addressed

Web3Signer validators do not support client authentication. This means the `--tls-known-clients-file` option on Web3Signer can't be used with Lighthouse.

## Proposed Changes

Add two new fields to Web3Signer validators, `client_identity_path` and `client_identity_password`, which specify the path and password for a PKCS12 file containing a certificate and private key. If `client_identity_path` is present, use the certificate for SSL client authentication.

## Additional Info

I am successfully validating on Prater using client authentication with Web3Signer and client authentication.

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

testing/web3signer_tests/tls/cert.pem

@@ -1,32 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIFmTCCA4GgAwIBAgIUd6yn4o1bKr2YpzTxcBmoiM4PorkwDQYJKoZIhvcNAQEL
-BQAwajELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAlZBMREwDwYDVQQHDAhTb21lQ2l0
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------END CERTIFICATE-----

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

testing/web3signer_tests/tls/key.key

@@ -1,52 +0,0 @@
------BEGIN PRIVATE KEY-----
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------END PRIVATE KEY-----

testing/web3signer_tests/tls/lighthouse/cert.pem

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

testing/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

testing/web3signer_tests/tls/lighthouse/key.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----

testing/web3signer_tests/tls/lighthouse/password.txt

@@ -0,0 +1 @@
+bark

testing/web3signer_tests/tls/lighthouse/web3signer.pem

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

testing/web3signer_tests/tls/web3signer/cert.pem

@@ -0,0 +1,32 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

testing/web3signer_tests/tls/web3signer/config

@@ -0,0 +1,19 @@
+[req]
+default_bits = 4096
+default_md = sha256
+distinguished_name = req_distinguished_name
+x509_extensions = v3_req
+prompt = no
+[req_distinguished_name]
+C = US
+ST = VA
+L = SomeCity
+O = MyCompany
+OU = MyDivision
+CN = web3signer
+[v3_req]
+keyUsage = keyEncipherment, dataEncipherment
+extendedKeyUsage = serverAuth
+subjectAltName = @alt_names
+[alt_names]
+IP.1 = 127.0.0.1

testing/web3signer_tests/tls/web3signer/key.key

@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+/OsV3MTX1gCaTE9Q2GlZVybDh20ZvdBC/g==
+-----END PRIVATE KEY-----

testing/web3signer_tests/tls/web3signer/known_clients.txt

@@ -0,0 +1 @@
+lighthouse 1B:43:E1:58:26:7D:3F:70:BD:DA:32:E9:29:A5:A9:50:EA:B2:A8:C3:0C:82:BF:90:13:ED:5B:E0:7D:5B:0A:C0