Implement mutual TLS authentication Add a pair of flags tls_client_certificate / tls_client_key to specify a certificate and corresponding key, which allow Bazel to authenticate itself over TLS to a remote cache or remote executor. Before this change, Bazel only supports Google Cloud authentication, which requires an open network connection to Google Cloud on the client as well as on the server. I have heard from one user that they are tunneling their traffic over a VPN and then perform no client authentication in their remote caching system. I heard from another user that they have locally patched Bazel to enable mTLS (but have not upstreamed the patch). Finally, there is also a pending feature request. Compared to other authentication mechanisms, mTLS is already supported by gRPC out of the box. I added test coverage by also adding a --tls_ca_certificate to the local remote worker, and updating the existing TLS test to also run with an mTLS configuration. I had to generate a new ca cert/key pair in order to sign a new client certificate (and also re-generate the server cert/key pair); these are checked in as testdata. Note that the generator script given there already supports generating both server and client cert/key pairs, so no change to the documentation was necessary. Fixes #10735. Change-Id: I8c9fdab11d172a4cc8a2b80de43faa48086cc893 Closes #11030. Change-Id: I8c9fdab11d172a4cc8a2b80de43faa48086cc893 NOKEYCHECK=True PiperOrigin-RevId: 304041337

diff --git a/src/test/shell/bazel/remote/BUILD b/src/test/shell/bazel/remote/BUILD
index d3848dd..0aa83be 100644
--- a/src/test/shell/bazel/remote/BUILD
+++ b/src/test/shell/bazel/remote/BUILD

@@ -47,6 +47,20 @@
     size = "large",
     timeout = "eternal",
     srcs = ["remote_execution_tls_test.sh"],
+    args = ["--tls"],
+    data = [
+        "//src/test/shell/bazel:test-deps",
+        "//src/test/testdata/test_tls_certificate",
+        "//src/tools/remote:worker",
+    ],
+)
+
+sh_test(
+    name = "remote_execution_mtls_test",
+    size = "large",
+    timeout = "eternal",
+    srcs = ["remote_execution_tls_test.sh"],
+    args = ["--mtls"],
     data = [
         "//src/test/shell/bazel:test-deps",
         "//src/test/testdata/test_tls_certificate",

diff --git a/src/test/shell/bazel/remote/remote_execution_tls_test.sh b/src/test/shell/bazel/remote/remote_execution_tls_test.sh
index c9205b9..2436acb 100755
--- a/src/test/shell/bazel/remote/remote_execution_tls_test.sh
+++ b/src/test/shell/bazel/remote/remote_execution_tls_test.sh

@@ -23,12 +23,22 @@
   || { echo "integration_test_setup.sh not found!" >&2; exit 1; }
 
 cert_path="${BAZEL_RUNFILES}/src/test/testdata/test_tls_certificate"
+client_mtls_flags=
+enable_mtls=0
+if [[ $1 == "--mtls" ]]; then
+  enable_mtls=1
+  client_mtls_flags="--tls_client_certificate=${cert_path}/client.crt --tls_client_key=${cert_path}/client.pem"
+fi
 
 function set_up() {
   work_path=$(mktemp -d "${TEST_TMPDIR}/remote.XXXXXXXX")
   cas_path=$(mktemp -d "${TEST_TMPDIR}/remote.XXXXXXXX")
   pid_file=$(mktemp -u "${TEST_TMPDIR}/remote.XXXXXXXX")
   attempts=1
+  mtls_flag=
+  if [[ $enable_mtls == 1 ]]; then
+    mtls_flag=--tls_ca_certificate="${cert_path}/ca.crt"
+  fi
   while [ $attempts -le 3 ]; do
     (( attempts++ ))
     worker_port=$(pick_random_unused_tcp_port) || fail "no port found"
@@ -38,6 +48,7 @@
         --cas_path=${cas_path} \
         --tls_certificate="${cert_path}/server.crt" \
         --tls_private_key="${cert_path}/server.pem" \
+        $mtls_flag \
         --pid_file="${pid_file}" >& $TEST_log &
     local wait_seconds=0
     until [ -s "${pid_file}" ] || [ "$wait_seconds" -eq 15 ]; do
@@ -82,10 +93,25 @@
   bazel build \
       --remote_cache=grpcs://localhost:${worker_port} \
       --tls_certificate="${cert_path}/ca.crt" \
+      ${client_mtls_flags} \
       //a:foo \
       || fail "Failed to build //a:foo with grpcs remote cache"
 }
 
+# Tests that bazel fails if no client cert is provided but the server requires one.
+function test_mtls_fails_if_client_has_no_cert() {
+  # This test only makes sense when we test mtls.
+  [[ $enable_mtls == 1 ]] || return 0
+  _prepareBasicRule
+
+  bazel build \
+      --remote_cache=grpcs://localhost:${worker_port} \
+      --tls_certificate="${cert_path}/ca.crt" \
+      //a:foo 2> $TEST_log \
+      && fail "Expected bazel to fail without a client cert" || true
+  expect_log "ALERT_HANDSHAKE_FAILURE"
+}
+
 function test_remote_grpc_cache() {
   # Test that if default scheme for --remote_cache flag, remote cache works.
   _prepareBasicRule
@@ -93,6 +119,7 @@
   bazel build \
       --remote_cache=localhost:${worker_port} \
       --tls_certificate="${cert_path}/ca.crt" \
+      ${client_mtls_flags} \
       //a:foo \
       || fail "Failed to build //a:foo with grpc remote cache"
 }
@@ -104,6 +131,7 @@
   bazel build \
       --remote_cache=https://localhost:${worker_port} \
       --tls_certificate="${cert_path}/ca.crt" \
+      ${client_mtls_flags} \
       //a:foo \
       || fail "Failed to build //a:foo with https remote cache"
 }
@@ -115,6 +143,7 @@
   bazel build \
       --remote_cache=grpc://localhost:${worker_port} \
       --tls_certificate="${cert_path}/ca.crt" \
+      ${client_mtls_flags} \
       //a:foo \
       && fail "Expected test failure" || true
 }

diff --git a/src/test/testdata/test_tls_certificate/ca.crt b/src/test/testdata/test_tls_certificate/ca.crt
index 0fd16e7..73d3ae5 100644
--- a/src/test/testdata/test_tls_certificate/ca.crt
+++ b/src/test/testdata/test_tls_certificate/ca.crt

@@ -1,27 +1,29 @@
 -----BEGIN CERTIFICATE-----
-MIIEpjCCAo4CCQC/fnOdyO3rEzANBgkqhkiG9w0BAQsFADAUMRIwEAYDVQQDDAls
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 -----END CERTIFICATE-----

diff --git a/src/test/testdata/test_tls_certificate/client.crt b/src/test/testdata/test_tls_certificate/client.crt
new file mode 100644
index 0000000..4a51444
--- /dev/null
+++ b/src/test/testdata/test_tls_certificate/client.crt

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEnjCCAoYCAQEwDQYJKoZIhvcNAQELBQAwFDESMBAGA1UEAwwJbG9jYWxob3N0
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+-----END CERTIFICATE-----

diff --git a/src/test/testdata/test_tls_certificate/client.pem b/src/test/testdata/test_tls_certificate/client.pem
new file mode 100644
index 0000000..f48d934
--- /dev/null
+++ b/src/test/testdata/test_tls_certificate/client.pem

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

diff --git a/src/test/testdata/test_tls_certificate/server.crt b/src/test/testdata/test_tls_certificate/server.crt
index 3cfae90..25a9e8a 100644
--- a/src/test/testdata/test_tls_certificate/server.crt
+++ b/src/test/testdata/test_tls_certificate/server.crt

@@ -1,27 +1,27 @@
 -----BEGIN CERTIFICATE-----
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+4UStoJkuEH+bbJyEH4c4pMZ9RkU91PN6bvs4lFK4DSQ8Qw==
 -----END CERTIFICATE-----

diff --git a/src/test/testdata/test_tls_certificate/server.pem b/src/test/testdata/test_tls_certificate/server.pem
index 8c5606a..0dec6ed 100644
--- a/src/test/testdata/test_tls_certificate/server.pem
+++ b/src/test/testdata/test_tls_certificate/server.pem

@@ -1,52 +1,52 @@
 -----BEGIN PRIVATE KEY-----
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+aHVuUhvPzxVX/6/lmrjx3TYT88rZN/GITwsOjKmjhXpmupi0K0qPobyMAsm+9fHt
+vQ3pWHuxvM+IjCYlCT+nxvy0VNJ0j4b8UTG8huKf8/yj0WI+eDwX7b9+5ZDcQb2/
+BJVAnb3b8e8orENkIhwr1juSOo9pRjN+QghbP2enGEJs4BZhm/rjBiXvQ6PuvumW
+ovb2OUxUrEc3qZuj6LWgAvLuOhG5VW1onbbvN1UHzWl43Ql1k3gks12U97eruAfp
+kFXtZAPNBO0IKMh9aPrUgaiakUeV1pQ=
 -----END PRIVATE KEY-----