letsencrypt: use a fake CA for self-signed testing certs

Production letsencrypt certificate generation creates an intermediate
chain file (ca.cer); to simulate this during the self-signed tests
generate a fake CA certifcate, and use that to sign the generated
server certificate.

Tests updated to look for all these files

Change-Id: I3990529bca7ff3c6413ed0066f9c4feaf5464b1c

playbooks/roles/letsencrypt-acme-sh-install/files/driver.sh

@@ -64,10 +64,17 @@ elif [[ ${1} == "selfsign" ]]; then
             mkdir -p ${CERT_HOME}/${domain}
             cd ${CERT_HOME}/${domain}
             echo "Creating certs in ${CERT_HOME}/${domain}"
+            # Generate a fake CA key
+            openssl genrsa -out ca.key 2048
+            # Create fake CA root certificate
+            openssl req -x509 -new -nodes -key ca.key -sha256 -days 1024 -subj "/C=US/ST=CA/O=opendev" -out ca.cer
+            # Create key for localhost
             openssl genrsa -out ${domain}.key 2048
-            openssl rsa -in ${domain}.key -out ${domain}.key
+            # Create localhost certificate signing request
             openssl req -sha256 -new -key ${domain}.key -out ${domain}.csr -subj '/CN=localhost'
-            openssl x509 -req -sha256 -days 365 -in ${domain}.csr -signkey ${domain}.key -out ${domain}.cer
+            # Create localhost certificate signed by fake CA
+            openssl x509 -req -CA ca.cer -CAkey ca.key -CAcreateserial \
+                    -sha256 -days 365 -in ${domain}.csr -out ${domain}.cer
             cp ${domain}.cer fullchain.cer
         } | tee -a ${LOG_FILE}
     done

testinfra/test_letsencrypt.py

@@ -49,6 +49,22 @@ def test_certs_created(host):
         assert domain_one.group == "letsencrypt"
         assert domain_one.mode == 0o640
 
+        cert_one = host.file(
+            '/etc/letsencrypt-certs/'
+            'letsencrypt01.opendev.org/letsencrypt01.opendev.org.cer')
+        assert cert_one.exists
+        assert cert_one.user == "root"
+        assert cert_one.group == "letsencrypt"
+        assert cert_one.mode == 0o640
+
+        ca_one = host.file(
+            '/etc/letsencrypt-certs/'
+            'letsencrypt01.opendev.org/ca.cer')
+        assert ca_one.exists
+        assert ca_one.user == "root"
+        assert ca_one.group == "letsencrypt"
+        assert ca_one.mode == 0o640
+
         domain_two = host.file(
             '/etc/letsencrypt-certs/'
             'someotherservice.opendev.org/someotherservice.opendev.org.key')
@@ -57,6 +73,22 @@ def test_certs_created(host):
         assert domain_two.group == "letsencrypt"
         assert domain_two.mode == 0o640
 
+        cert_two = host.file(
+            '/etc/letsencrypt-certs/'
+            'someotherservice.opendev.org/someotherservice.opendev.org.cer')
+        assert cert_two.exists
+        assert cert_two.user == "root"
+        assert cert_two.group == "letsencrypt"
+        assert cert_two.mode == 0o640
+
+        ca_two = host.file(
+            '/etc/letsencrypt-certs/'
+            'someotherservice.opendev.org/ca.cer')
+        assert ca_one.exists
+        assert ca_one.user == "root"
+        assert ca_one.group == "letsencrypt"
+        assert ca_one.mode == 0o640
+
     elif host.backend.get_hostname() == 'letsencrypt02.opendev.org':
         domain_one = host.file(
             '/etc/letsencrypt-certs/'
@@ -66,6 +98,22 @@ def test_certs_created(host):
         assert domain_one.group == "letsencrypt"
         assert domain_one.mode == 0o640
 
+        cert_one = host.file(
+            '/etc/letsencrypt-certs/'
+            'letsencrypt02.opendev.org/letsencrypt02.opendev.org.cer')
+        assert cert_one.exists
+        assert cert_one.user == "root"
+        assert cert_one.group == "letsencrypt"
+        assert cert_one.mode == 0o640
+
+        ca_one = host.file(
+            '/etc/letsencrypt-certs/'
+            'letsencrypt02.opendev.org/ca.cer')
+        assert ca_one.exists
+        assert ca_one.user == "root"
+        assert ca_one.group == "letsencrypt"
+        assert ca_one.mode == 0o640
+
     else:
         pytest.skip()