13 files changed, 349 insertions, 5 deletions
diff --git a/jstests/ssl/cluster_member.js b/jstests/ssl/cluster_member.js
new file mode 100644
index 00000000000..670bbedd97c
--- /dev/null
+++ b/jstests/ssl/cluster_member.js
@@ -0,0 +1,116 @@
+// Test configuration parameter tlsClusterAuthX509ExtensionValue
+// aka: net.tls.clusterAuthX509.extensionValue
+// @tags: [ featureFlagConfigurableX509ClusterAuthn ]
+
+(function() {
+'use strict';
+
+load('jstests/ssl/libs/ssl_helpers.js');
+if (determineSSLProvider() !== "openssl") {
+    jsTest.log('Test requires openssl based TLS support');
+    return;
+}
+
+// Fails when used without clusterAuthMode == 'X509'
+{
+    const opts = {auth: '', tlsClusterAuthX509ExtensionValue: 'foo'};
+    const errmsg =
+        'net.tls.clusterAuthX509.extensionValue requires a clusterAuthMode which allows for usage of X509';
+
+    jsTest.log('No clusterAuthMode set');
+    clearRawMongoProgramOutput();
+    assert.throws(() => MongoRunner.runMongod(opts));
+    assert(rawMongoProgramOutput().includes(errmsg));
+
+    jsTest.log('clusterAuthMode == keyFile');
+    clearRawMongoProgramOutput();
+    opts.clusterAuthMode = 'keyFile';
+    assert.throws(() => MongoRunner.runMongod(opts));
+    assert(rawMongoProgramOutput().includes(errmsg));
+}
+
+function authAndDo(port, cert, cmd = ';') {
+    jsTest.log('Connecting to localhost using cert: ' + cert);
+    function x509auth(db) {
+        const ext = db.getSiblingDB('$external');
+        assert.commandWorked(ext.runCommand({authenticate: 1, mechanism: 'MONGODB-X509'}));
+        return ext.adminCommand({connectionStatus: 1});
+    }
+    clearRawMongoProgramOutput();
+    const shell = runMongoProgram('mongo',
+                                  '--host',
+                                  'localhost',
+                                  '--port',
+                                  port,
+                                  '--tls',
+                                  '--tlsCAFile',
+                                  'jstests/libs/ca.pem',
+                                  '--tlsCertificateKeyFile',
+                                  cert,
+                                  '--eval',
+                                  x509auth + ' x509auth(db); ' + cmd);
+    assert.eq(shell, 0);
+}
+
+function runTest(conn) {
+    const SERVER_RDN = 'CN=server,OU=Kernel,O=MongoDB,L=New York City,ST=New York,C=US';
+    const SERVER = 'jstests/libs/server.pem';
+    const FOO_MEMBER = 'jstests/ssl/libs/cluster-member-foo.pem';
+    const BAR_MEMBER = 'jstests/ssl/libs/cluster-member-bar.pem';
+    const FOO_MEMBER_ALT = 'jstests/ssl/libs/cluster-member-foo-alt-rdn.pem';
+    const FOO_MEMBER_ALT_RDN = 'CN=Doer,OU=Business,O=Company,L=Fakesville,ST=Example,C=ZZ';
+
+    const admin = conn.getDB('admin');
+    const ext = conn.getDB('$external');
+
+    // Ensure no localhost auth bypass available.
+    assert.commandWorked(admin.runCommand({createUser: 'admin', pwd: 'admin', roles: ['root']}));
+    assert(admin.auth('admin', 'admin'));
+
+    // Connect using server.pem which has the same RDN, but no custom extension.
+    // This will result in an unknown user condition because we are
+    // not recognized as a cluster member.
+    assert.throws(() => authAndDo(conn.port, SERVER));
+
+    const insertCmd = 'assert.writeOK(db.getSiblingDB("test").mycoll.insert({x:1}));';
+    // Connect using same RDN WITH custom extension.
+    authAndDo(conn.port, FOO_MEMBER, insertCmd);
+
+    // Connect using cert with membership extension, but wrong value.
+    assert.throws(() => authAndDo(conn.port, BAR_MEMBER));
+
+    // Connect using cert with right membership, but different RDN (allowed).
+    authAndDo(conn.port, FOO_MEMBER_ALT, insertCmd);
+
+    // Create a user who would have been a cluster member under name based rules.
+    // We should have basic privs, testing with read but not write.
+    const readCmd = 'db.getSiblingDB("test").mycoll.find({});';
+    const readRoles = [{db: 'admin', role: 'readAnyDatabase'}];
+    assert.commandWorked(ext.runCommand({createUser: SERVER_RDN, roles: readRoles}));
+    authAndDo(conn.port, SERVER, readCmd);
+    assert.throws(() => authAndDo(conn.port, SERVER, insertCmd));
+
+    // Create a user with FOO_MEMBER_ALT's RDN to validate enforceUserClusterSeparation.
+    authAndDo(conn.port, FOO_MEMBER_ALT);
+    assert.commandWorked(ext.runCommand({createUser: FOO_MEMBER_ALT_RDN, roles: readRoles}));
+    assert.throws(() => authAndDo(conn.port, FOO_MEMBER_ALT));
+}
+
+{
+    const opts = {
+        auth: '',
+        tlsMode: 'requireTLS',
+        tlsCertificateKeyFile: 'jstests/ssl/libs/cluster-member-foo.pem',
+        tlsCAFile: 'jstests/libs/ca.pem',
+        clusterAuthMode: 'x509',
+        tlsClusterAuthX509ExtensionValue: 'foo',
+        setParameter: {
+            enforceUserClusterSeparation: 'true',
+        },
+    };
+
+    const mongod = MongoRunner.runMongod(opts);
+    runTest(mongod);
+    MongoRunner.stopMongod(mongod);
+}
+})();
diff --git a/jstests/ssl/libs/cluster-member-bar.pem b/jstests/ssl/libs/cluster-member-bar.pem
new file mode 100644
index 00000000000..27b9f533afd
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-bar.pem
@@ -0,0 +1,58 @@
+# Autogenerated file, do not edit.
+# Generate using jstests/ssl/x509/mkcert.py --config jstests/ssl/x509/certs.yml cluster-member-bar.pem
+#
+# A server certificate with the mongoClusterMembership extension with a value of bar
+-----BEGIN CERTIFICATE-----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==
+-----END CERTIFICATE-----
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----
diff --git a/jstests/ssl/libs/cluster-member-bar.pem.digest.sha1 b/jstests/ssl/libs/cluster-member-bar.pem.digest.sha1
new file mode 100644
index 00000000000..53b59e4aa35
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-bar.pem.digest.sha1
@@ -0,0 +1 @@
+D498E0A2F8CF71D5349BB91E11E6D05350C88A3C
+\ No newline at end of file
diff --git a/jstests/ssl/libs/cluster-member-bar.pem.digest.sha256 b/jstests/ssl/libs/cluster-member-bar.pem.digest.sha256
new file mode 100644
index 00000000000..a0ce1bd86a8
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-bar.pem.digest.sha256
@@ -0,0 +1 @@
+F957FEBEEC5C9C08C2500C17432B47635C12101E4DD42183FD333542ACD0AE5D
+\ No newline at end of file
diff --git a/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem
new file mode 100644
index 00000000000..9b4a86dfd17
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem
@@ -0,0 +1,58 @@
+# Autogenerated file, do not edit.
+# Generate using jstests/ssl/x509/mkcert.py --config jstests/ssl/x509/certs.yml cluster-member-foo-alt-rdn.pem
+#
+# A server certificate with the mongoClusterMembership extension with a value of foo, but an unrelated RDN
+-----BEGIN CERTIFICATE-----
+MIIEdjCCA16gAwIBAgIEGs/cgTANBgkqhkiG9w0BAQsFADB0MQswCQYDVQQGEwJV
+UzERMA8GA1UECAwITmV3IFlvcmsxFjAUBgNVBAcMDU5ldyBZb3JrIENpdHkxEDAO
+BgNVBAoMB01vbmdvREIxDzANBgNVBAsMBktlcm5lbDEXMBUGA1UEAwwOS2VybmVs
+IFRlc3QgQ0EwHhcNMjMwMzE1MTU0MjEwWhcNMjUwNjE2MTU0MjEwWjBoMQswCQYD
+VQQGEwJaWjEQMA4GA1UECAwHRXhhbXBsZTETMBEGA1UEBwwKRmFrZXN2aWxsZTEQ
+MA4GA1UECgwHQ29tcGFueTERMA8GA1UECwwIQnVzaW5lc3MxDTALBgNVBAMMBERv
+ZXIwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCKB1iyc78amtXCaOfh
+3wZ7jidmiLI0IMGk1KuGnUzyoRlX6PlFKm+I5/rbyVgVK0MEKIJU1rxrxBwwJyW/
+/D1NOH1FTcKk+FnkBs7T1iwct+2OocMArQVcavFayqcqubxvWFztjBNxCoh578OH
+u7BBqG3iXu8HvWivm+FAkqYWNk8M0us5Ui/yQShRXcPRTYqAFyTatlcesijGMKEA
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+hpMtmcf8GsSlDKmGXW335+95f5emZV7WmfKqaolAI0rjA7/sI98QuiqcloCEhSE9
+eS3jEuEEeDvySwnqKgz45eTXyjqjpH746uIXju427xQtr4z6gYYQZBls1ozEFrYp
+MfQXZJqVm6Kodg72LNrjToWeuNGkeGtGikyqXAlCM3/s7FsapuN89KjNsQv1p8e0
+LTXnJAm/5yxcuQyxWq87pta11IS89RylDDwmMMBIJWwAE07O+zH/1OC6yevapKn7
+rZw/gYz4uhbmlzsQVJrHdsaZ8Dr6+Enpz5X9CmNRqijk5dbzaSS9wvbu
+-----END CERTIFICATE-----
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCKB1iyc78amtXC
+aOfh3wZ7jidmiLI0IMGk1KuGnUzyoRlX6PlFKm+I5/rbyVgVK0MEKIJU1rxrxBww
+JyW//D1NOH1FTcKk+FnkBs7T1iwct+2OocMArQVcavFayqcqubxvWFztjBNxCoh5
+78OHu7BBqG3iXu8HvWivm+FAkqYWNk8M0us5Ui/yQShRXcPRTYqAFyTatlcesijG
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+hjbFxuRqsZfnV25pcba3K+NWK1M2SyetrZQ8i/ZZPwkCsabxg7yIhoJ06lk7w0nC
+aM5zGn+bnQs4T+6LASNmTqT8G6BvyZZfP4R26LG0WrCOhrWUc5O0/Lvj/bxE/4uB
+QVHO8sa9e+PhEbQHtLR6HgVfkTJeAYvZJkkHr80CgYBAo06hacP0ATWy9GetJztU
+9OZfhobBuk3kBdU3tNFNe8UFRLg0MnUwv3FdXM6XsVhH/r18ApACityAzA+cMw5o
+9nPyi+C8GqWum1eg3XaSPpKxNCVsAQuTJpSjL3JqeZSo07XUOAS2om5AQBLsbGHB
+2hpwDA/Ccom2Sc8E/VysmQ==
+-----END PRIVATE KEY-----
diff --git a/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha1 b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha1
new file mode 100644
index 00000000000..773e4493989
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha1
@@ -0,0 +1 @@
+94F9962116E92EBDB4FC7007304957CCE1A41F26
+\ No newline at end of file
diff --git a/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha256 b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha256
new file mode 100644
index 00000000000..02ea263cddb
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo-alt-rdn.pem.digest.sha256
@@ -0,0 +1 @@
+215C9A1DB0D815E937668EBE8230496B9FDB3DBE2F9700820B9F631B87C28CB5
+\ No newline at end of file
diff --git a/jstests/ssl/libs/cluster-member-foo.pem b/jstests/ssl/libs/cluster-member-foo.pem
new file mode 100644
index 00000000000..a80d90767d7
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo.pem
@@ -0,0 +1,58 @@
+# Autogenerated file, do not edit.
+# Generate using jstests/ssl/x509/mkcert.py --config jstests/ssl/x509/certs.yml cluster-member-foo.pem
+#
+# A server certificate with the mongoClusterMembership extension with a value of foo
+-----BEGIN CERTIFICATE-----
+MIIEejCCA2KgAwIBAgIEU7DfoTANBgkqhkiG9w0BAQsFADB0MQswCQYDVQQGEwJV
+UzERMA8GA1UECAwITmV3IFlvcmsxFjAUBgNVBAcMDU5ldyBZb3JrIENpdHkxEDAO
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+YKu70fqITRKchyXu2kAgIjAhUWjtllmYrIiWjiWwCaPJYcYIxXXIn3f9itzjjA==
+-----END CERTIFICATE-----
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQCiPuwadSl3eC4x
+YFkPeDCKUjDkihXJJRqTSD0XtURJtTSe8JLoN/n3hOcTu/6lhRzOrpTajx+ABSLw
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+WREDb3ONFYMUxgzcvCDXgQ==
+-----END PRIVATE KEY-----
diff --git a/jstests/ssl/libs/cluster-member-foo.pem.digest.sha1 b/jstests/ssl/libs/cluster-member-foo.pem.digest.sha1
new file mode 100644
index 00000000000..21209a1dc30
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo.pem.digest.sha1
@@ -0,0 +1 @@
+5A081EAA0D42DED66771504EC405C5F9AE4885EA
+\ No newline at end of file
diff --git a/jstests/ssl/libs/cluster-member-foo.pem.digest.sha256 b/jstests/ssl/libs/cluster-member-foo.pem.digest.sha256
new file mode 100644
index 00000000000..4ef362e70f5
--- /dev/null
+++ b/jstests/ssl/libs/cluster-member-foo.pem.digest.sha256
@@ -0,0 +1 @@
+D0298CCEA9CEEBF3E739E331AD7A4C5A485DCB8FC66AD236F281BB5040136076
+\ No newline at end of file
diff --git a/jstests/ssl/x509/README b/jstests/ssl/x509/README
index 346e06f750d..e85e25ecb4f 100644
--- a/jstests/ssl/x509/README
+++ b/jstests/ssl/x509/README
@@ -64,3 +64,4 @@ certs:
     - mongoRoles:
       - {role: readWrite, db: test1}
       - {role: read, db: test2}
+    - mongoClusterMembership: clusterName
diff --git a/jstests/ssl/x509/certs.yml b/jstests/ssl/x509/certs.yml
index b2f50d283ba..ebedbaba66d 100644
--- a/jstests/ssl/x509/certs.yml
+++ b/jstests/ssl/x509/certs.yml
@@ -284,7 +284,7 @@ certs:
 - name: 'server.pem'
   description: General purpose server certificate file.
   Subject: {CN: 'server'}
-  extensions:
+  extensions: &server_pem_extensions
     basicConstraints: {CA: false}
     subjectKeyIdentifier: hash
     keyUsage: [digitalSignature, keyEncipherment]
@@ -342,6 +342,36 @@ certs:
   extensions:
     extendedKeyUsage: [serverAuth]
 
+- name: 'cluster-member-foo.pem'
+  output_path: 'jstests/ssl/libs/'
+  description: A server certificate with the mongoClusterMembership extension with a value of foo
+  Subject: {CN: 'server'}
+  extensions:
+    <<: *server_pem_extensions
+    mongoClusterMembership: foo
+
+- name: 'cluster-member-bar.pem'
+  output_path: 'jstests/ssl/libs/'
+  description: A server certificate with the mongoClusterMembership extension with a value of bar
+  Subject: {CN: 'server'}
+  extensions:
+    <<: *server_pem_extensions
+    mongoClusterMembership: bar
+
+- name: 'cluster-member-foo-alt-rdn.pem'
+  output_path: 'jstests/ssl/libs/'
+  description: A server certificate with the mongoClusterMembership extension with a value of foo, but an unrelated RDN
+  Subject:
+    C: 'ZZ'
+    ST: 'Example'
+    L: 'Fakesville'
+    O: 'Company'
+    OU: 'Business'
+    CN: 'Doer'
+  extensions:
+    <<: *server_pem_extensions
+    mongoClusterMembership: foo
+
 # For tenant migration testing.
 - name: 'rs0.pem'
   description: General purpose server certificate file.
diff --git a/jstests/ssl/x509/mkcert.py b/jstests/ssl/x509/mkcert.py
index 45ac802e51c..58848ceaaa6 100755
--- a/jstests/ssl/x509/mkcert.py
+++ b/jstests/ssl/x509/mkcert.py
@@ -20,10 +20,17 @@ import shutil
 import mkdigest
 
 # pylint: disable=protected-access
-OpenSSL._util.lib.OBJ_create(b'1.2.3.45', b'DummyOID45', b'Dummy OID 45')
-OpenSSL._util.lib.OBJ_create(b'1.2.3.56', b'DummyOID56', b'Dummy OID 56')
-OpenSSL._util.lib.OBJ_create(b'1.3.6.1.4.1.34601.2.1.1', b'mongoRoles',
-                              b'Sequence of MongoDB Database Roles')
+try:
+    # Newer versions of PyOpenSSL hide OBJ_create, but also seem okay without it.
+    OBJ_create = OpenSSL._util.lib.OBJ_create
+    OBJ_create(b'1.2.3.45', b'DummyOID45', b'Dummy OID 45')
+    OBJ_create(b'1.2.3.56', b'DummyOID56', b'Dummy OID 56')
+    OBJ_create(b'1.3.6.1.4.1.34601.2.1.1', b'mongoRoles',
+               b'Sequence of MongoDB Database Roles')
+    OBJ_create(b'1.3.6.1.4.1.34601.2.1.2', b'mongoClusterMembership',
+               b'Name of MongoDB cluster this cert is a member of')
+except:
+    pass
 # pylint: enable=protected-access
 
 CONFIGFILE = 'jstests/ssl/x509/certs.yml'
@@ -319,6 +326,15 @@ def set_mongo_roles_extension(exts, cert):
 
     exts.append(OpenSSL.crypto.X509Extension(b'1.3.6.1.4.1.34601.2.1.1', False, value))
 
+def set_mongo_cluster_membership_extension(exts, cert):
+    """Encode a symbolic name to a mongodbClusterMembership extension."""
+    name = cert.get('extensions', {}).get('mongoClusterMembership')
+    if not name:
+        return
+
+    value = b'DER:' + binascii.hexlify(to_der_utf8_string(name))
+    exts.append(OpenSSL.crypto.X509Extension(b'1.3.6.1.4.1.34601.2.1.2', False, value))
+
 def set_crl_distribution_point_extension(exts, cert):
     """Specify URI(s) for CRL distribution point(s)."""
     uris = cert.get('extensions', {}).get('crlDistributionPoints')
@@ -345,6 +361,7 @@ def set_extensions(x509, cert):
     set_crl_distribution_point_extension(exts, cert)
     set_san_extension(x509, exts, cert)
     set_mongo_roles_extension(exts, cert)
+    set_mongo_cluster_membership_extension(exts, cert)
 
     ns_comment = cert.get('extensions', {}).get('nsComment')
     if ns_comment: