configverify: T6198: add common helper for PKI certificate validation

The next evolutional step after adding get_config_dict(..., with_pki=True) is
to add a common verification function for the recurring task of validating SSL
certificate existance in e.g. EAPoL, OpenConnect, SSTP or HTTPS.

(cherry picked from commit 3b758d870449e92fece9e29c791b950b332e6e65)

1 files changed, 66 insertions, 37 deletions

diff --git a/python/vyos/configverify.py b/python/vyos/configverify.py
index 6508ccdd9..2a5452e7b 100644
--- a/python/vyos/configverify.py
+++ b/python/vyos/configverify.py
@@ -162,43 +162,6 @@ def verify_tunnel(config):
         if 'source_address' in config and is_ipv6(config['source_address']):
             raise ConfigError('Can not use local IPv6 address is for mGRE tunnels')
 
-def verify_eapol(config):
-    """
-    Common helper function used by interface implementations to perform
-    recurring validation of EAPoL configuration.
-    """
-    if 'eapol' in config:
-        if 'certificate' not in config['eapol']:
-            raise ConfigError('Certificate must be specified when using EAPoL!')
-
-        if 'pki' not in config or 'certificate' not in config['pki']:
-            raise ConfigError('Invalid certificate specified for EAPoL')
-
-        cert_name = config['eapol']['certificate']
-        if cert_name not in config['pki']['certificate']:
-            raise ConfigError('Invalid certificate specified for EAPoL')
-
-        cert = config['pki']['certificate'][cert_name]
-
-        if 'certificate' not in cert or 'private' not in cert or 'key' not in cert['private']:
-            raise ConfigError('Invalid certificate/private key specified for EAPoL')
-
-        if 'password_protected' in cert['private']:
-            raise ConfigError('Encrypted private key cannot be used for EAPoL')
-
-        if 'ca_certificate' in config['eapol']:
-            if 'ca' not in config['pki']:
-                raise ConfigError('Invalid CA certificate specified for EAPoL')
-
-            for ca_cert_name in config['eapol']['ca_certificate']:
-                if ca_cert_name not in config['pki']['ca']:
-                    raise ConfigError('Invalid CA certificate specified for EAPoL')
-
-                ca_cert = config['pki']['ca'][ca_cert_name]
-
-                if 'certificate' not in ca_cert:
-                    raise ConfigError('Invalid CA certificate specified for EAPoL')
-
 def verify_mirror_redirect(config):
     """
     Common helper function used by interface implementations to perform
@@ -487,3 +450,69 @@ def verify_access_list(access_list, config, version=''):
     # Check if the specified ACL exists, if not error out
     if dict_search(f'policy.access-list{version}.{access_list}', config) == None:
         raise ConfigError(f'Specified access-list{version} "{access_list}" does not exist!')
+
+def verify_pki_certificate(config: dict, cert_name: str, no_password_protected: bool=False):
+    """
+    Common helper function user by PKI consumers to perform recurring
+    validation functions for PEM based certificates
+    """
+    if 'pki' not in config:
+        raise ConfigError('PKI is not configured!')
+
+    if 'certificate' not in config['pki']:
+        raise ConfigError('PKI does not contain any certificates!')
+
+    if cert_name not in config['pki']['certificate']:
+        raise ConfigError(f'Certificate "{cert_name}" not found in configuration!')
+
+    pki_cert = config['pki']['certificate'][cert_name]
+    if 'certificate' not in pki_cert:
+        raise ConfigError(f'PEM certificate for "{cert_name}" missing in configuration!')
+
+    if 'private' not in pki_cert or 'key' not in pki_cert['private']:
+        raise ConfigError(f'PEM private key for "{cert_name}" missing in configuration!')
+
+    if no_password_protected and 'password_protected' in pki_cert['private']:
+        raise ConfigError('Password protected PEM private key is not supported!')
+
+def verify_pki_ca_certificate(config: dict, ca_name: str):
+    """
+    Common helper function user by PKI consumers to perform recurring
+    validation functions for PEM based CA certificates
+    """
+    if 'pki' not in config:
+        raise ConfigError('PKI is not configured!')
+
+    if 'ca' not in config['pki']:
+        raise ConfigError('PKI does not contain any CA certificates!')
+
+    if ca_name not in config['pki']['ca']:
+        raise ConfigError(f'CA Certificate "{ca_name}" not found in configuration!')
+
+    pki_cert = config['pki']['ca'][ca_name]
+    if 'certificate' not in pki_cert:
+        raise ConfigError(f'PEM CA certificate for "{cert_name}" missing in configuration!')
+
+def verify_pki_dh_parameters(config: dict, dh_name: str, min_key_size: int=0):
+    """
+    Common helper function user by PKI consumers to perform recurring
+    validation functions on DH parameters
+    """
+    from vyos.pki import load_dh_parameters
+
+    if 'pki' not in config:
+        raise ConfigError('PKI is not configured!')
+
+    if 'dh' not in config['pki']:
+        raise ConfigError('PKI does not contain any DH parameters!')
+
+    if dh_name not in config['pki']['dh']:
+        raise ConfigError(f'DH parameter "{dh_name}" not found in configuration!')
+
+    if min_key_size:
+        pki_dh = config['pki']['dh'][dh_name]
+        dh_params = load_dh_parameters(pki_dh['parameters'])
+        dh_numbers = dh_params.parameter_numbers()
+        dh_bits = dh_numbers.p.bit_length()
+        if dh_bits < min_key_size:
+            raise ConfigError(f'Minimum DH key-size is {min_key_size} bits!')