rpki: T3255: backport new implementation from current branch

1 files changed, 138 insertions, 0 deletions

diff --git a/src/conf_mode/protocols_rpki.py b/src/conf_mode/protocols_rpki.py
new file mode 100755
index 000000000..0b9525caf
--- /dev/null
+++ b/src/conf_mode/protocols_rpki.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2021 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import dict_merge
+from vyos.template import render
+from vyos.template import render_to_string
+from vyos.util import call
+from vyos.util import dict_search
+from vyos.xml import defaults
+from vyos import ConfigError
+from vyos import frr
+from vyos import airbag
+airbag.enable()
+
+config_file = r'/tmp/rpki.frr'
+frr_daemon = 'bgpd'
+
+DEBUG = os.path.exists('/tmp/rpki.debug')
+if DEBUG:
+    import logging
+    lg = logging.getLogger("vyos.frr")
+    lg.setLevel(logging.DEBUG)
+    ch = logging.StreamHandler()
+    lg.addHandler(ch)
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['protocols', 'rpki']
+
+    rpki = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+    if not conf.exists(base):
+        return rpki
+
+    # We have gathered the dict representation of the CLI, but there are default
+    # options which we need to update into the dictionary retrived.
+    default_values = defaults(base)
+    rpki = dict_merge(default_values, rpki)
+
+    return rpki
+
+def verify(rpki):
+    if not rpki:
+        return None
+
+    if 'cache' in rpki:
+        preferences = []
+        for peer, peer_config in rpki['cache'].items():
+            for mandatory in ['port', 'preference']:
+                if mandatory not in peer_config:
+                    raise ConfigError(f'RPKI cache "{peer}" {mandatory} must be defined!')
+
+            if 'preference' in peer_config:
+                preference = peer_config['preference']
+                if preference in preferences:
+                    raise ConfigError(f'RPKI cache with preference {preference} already configured!')
+                preferences.append(preference)
+
+            if 'ssh' in peer_config:
+                files = ['private_key_file', 'public_key_file', 'known_hosts_file']
+                for file in files:
+                    if file not in peer_config['ssh']:
+                        raise ConfigError('RPKI+SSH requires username, public/private ' \
+                                          'keys and known-hosts file to be defined!')
+
+                    filename = peer_config['ssh'][file]
+                    if not os.path.exists(filename):
+                        raise ConfigError(f'RPKI SSH {file.replace("-","-")} "{filename}" does not exist!')
+
+    return None
+
+def generate(rpki):
+    # render(config) not needed, its only for debug
+    render(config_file, 'frr/rpki.frr.tmpl', rpki)
+    rpki['new_frr_config'] = render_to_string('frr/rpki.frr.tmpl', rpki)
+
+    return None
+
+def apply(rpki):
+    # Save original configuration prior to starting any commit actions
+    frr_cfg = frr.FRRConfig()
+    frr_cfg.load_configuration(frr_daemon)
+    frr_cfg.modify_section('rpki', '')
+    frr_cfg.add_before(r'(ip prefix-list .*|route-map .*|line vty)', rpki['new_frr_config'])
+
+    # Debugging
+    if DEBUG:
+        from pprint import pprint
+        print('')
+        print('--------- DEBUGGING ----------')
+        pprint(dir(frr_cfg))
+        print('Existing config:\n')
+        for line in frr_cfg.original_config:
+            print(line)
+        print(f'Replacement config:\n')
+        print(f'{rpki["new_frr_config"]}')
+        print(f'Modified config:\n')
+        print(f'{frr_cfg}')
+
+    frr_cfg.commit_configuration(frr_daemon)
+
+    # If FRR config is blank, re-run the blank commit x times due to frr-reload
+    # behavior/bug not properly clearing out on one commit.
+    if rpki['new_frr_config'] == '':
+        for a in range(5):
+            frr_cfg.commit_configuration(frr_daemon)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)