nixosTests.tpm-ek: provide EK certificates to tests

NixOS · Dec 12, 2024 · 059a86b · 059a86b
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diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
@@ -1065,6 +1065,7 @@ in {
   tmate-ssh-server = handleTest ./tmate-ssh-server.nix { };
   tomcat = handleTest ./tomcat.nix {};
   tor = handleTest ./tor.nix {};
+  tpm-ek = handleTest ./tpm-ek {};
   traefik = handleTestOn ["aarch64-linux" "x86_64-linux"] ./traefik.nix {};
   trafficserver = handleTest ./trafficserver.nix {};
   transfer-sh = handleTest ./transfer-sh.nix {};

diff --git a/nixos/tests/tpm-ek/ca.crt b/nixos/tests/tpm-ek/ca.crt
@@ -0,0 +1,19 @@
+-----BEGIN CERTIFICATE-----
+MIIDHTCCAgWgAwIBAgIUbCWkrXLAgC+z2vWzFcVaS/bHpkkwDQYJKoZIhvcNAQEL
+BQAwHjEcMBoGA1UECgwTVmVyeSBsZWdpdCBDQSwgSW5jLjAeFw0yNDEyMTIwMzEy
+MTNaFw0zNDEyMTAwMzEyMTNaMB4xHDAaBgNVBAoME1ZlcnkgbGVnaXQgQ0EsIElu
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+/Gev/ITUYV7QHpgByNcF+yeqMkTigFVcknSwhM6pw++apPARrEjtf3YTzrFAlM7z
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+yJ6Z77Zh7MpVkmGsm4hyFzZ2cnTotGoFCd/AGfmj+GlW
+-----END CERTIFICATE-----
diff --git a/nixos/tests/tpm-ek/ca.priv b/nixos/tests/tpm-ek/ca.priv
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvAIBADANBgkqhkiG9w0BAQEFAASCBKYwggSiAgEAAoIBAQC1tBr/aneQCULi
+xAST/Gev/ITUYV7QHpgByNcF+yeqMkTigFVcknSwhM6pw++apPARrEjtf3YTzrFA
+lM7zmo5M16exbDNKKgTQ90Ms8bvQbeAiHZneWFpT1kuQxcnb0veOsbzM7ksV7qRH
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+CSH8r/EnAgMBAAECggEAUKW/1d3Lc4KozT1zSrucyd+qlRkim/z4OtKJnX37/O6S
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+QtS9SXCS8jhf2CAm4ExPopedLJPI8bxiHvS4E3eMt4WzI8cjkEgF9q8nKVxuHWYp
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+vwXYKH6kQJr7q+hBbBPikA==
+-----END PRIVATE KEY-----
diff --git a/nixos/tests/tpm-ek/default.nix b/nixos/tests/tpm-ek/default.nix
@@ -0,0 +1,108 @@
+import ../make-test-python.nix (
+  { lib, pkgs, ... }:
+
+  let
+    inherit (pkgs) writeText tpm2-tools openssl;
+    ek_config = writeText "ek-sign.cnf" ''
+      [ tpm_policy ]
+      basicConstraints = CA:FALSE
+
+      keyUsage = keyEncipherment
+      certificatePolicies = 2.23.133.2.1
+      extendedKeyUsage = 2.23.133.8.1
+
+      subjectAltName = ASN1:SEQUENCE:dirname_tpm
+
+      [ dirname_tpm ]
+      seq = EXPLICIT:4,SEQUENCE:dirname_tpm_seq
+
+      [ dirname_tpm_seq ]
+      set = SET:dirname_tpm_set
+
+      [ dirname_tpm_set ]
+      seq.1 = SEQUENCE:dirname_tpm_seq_manufacturer
+      seq.2 = SEQUENCE:dirname_tpm_seq_model
+      seq.3 = SEQUENCE:dirname_tpm_seq_version
+
+      # We're going to mock up an STM TPM here
+      [dirname_tpm_seq_manufacturer]
+      oid = OID:2.23.133.2.1
+      str = UTF8:"id:53544D20"
+
+      [dirname_tpm_seq_model]
+      oid = OID:2.23.133.2.2
+      str = UTF8:"ST33HTPHAHD4
+
+      [dirname_tpm_seq_version]
+      oid = OID:2.23.133.2.3
+      str = UTF8:"id:00010101"
+    '';
+  in
+  {
+    name = "tpm-ek";
+
+    meta = {
+      maintainers = with lib.maintainers; [ baloo ];
+    };
+
+    nodes.machine =
+      { pkgs, ... }:
+      {
+        environment.systemPackages = [
+          openssl
+          tpm2-tools
+        ];
+
+        security.tpm2 = {
+          enable = true;
+          tctiEnvironment.enable = true;
+        };
+
+        virtualisation.tpm = {
+          enable = true;
+          provisioning = ''
+            export PATH=${
+              lib.makeBinPath [
+                openssl
+              ]
+            }:$PATH
+
+            tpm2_createek -G rsa -u ek.pub -c ek.ctx -f pem
+
+            # Sign a certificate
+            # Pretend we're an STM TPM
+            openssl x509 \
+              -extfile ${ek_config} \
+              -new -days 365 \
+              \
+              -subj "/CN=this.is.required.but.it.should.not/" \
+              -extensions tpm_policy \
+              \
+              -CA ${./ca.crt} -CAkey ${./ca.priv} \
+              \
+              -out device.der -outform der \
+              -force_pubkey ek.pub
+
+            # Create a nvram slot for the certificate, and we need the size
+            # to precisely match the length of the certificate we're going to
+            # put in.
+            tpm2_nvdefine 0x01c00002 \
+              -C o \
+              -a "ownerread|policyread|policywrite|ownerwrite|authread|authwrite" \
+              -s "$(wc -c device.der| cut -f 1 -d ' ')"
+
+            tpm2_nvwrite 0x01c00002 -C o -i device.der
+          '';
+        };
+      };
+
+    testScript = ''
+      start_all()
+      machine.wait_for_unit("multi-user.target")
+
+      machine.succeed('tpm2_nvread 0x01c00002 | openssl x509 -inform der -out /tmp/ek.pem')
+      print(machine.succeed('openssl x509 -in /tmp/ek.pem -text'))
+      machine.succeed('openssl verify -CAfile ${./ca.crt} /tmp/ek.pem')
+    '';
+  }
+)