Give a nice error if a VPN key can't be readed (refs #22).

[software/pymin.git] / pymin / services / firewall / __init__.py

diff --git a/pymin/services/firewall/__init__.py b/pymin/services/firewall/__init__.py
index 06b41915cd4a78b66a300dee08f0ce51eec666cc..0ab2b4c9be1f73814fbcb2462edcbffdba73a9b3 100644 (file)
--- a/pymin/services/firewall/__init__.py
+++ b/pymin/services/firewall/__init__.py
@@ -4,15 +4,24 @@
 # of using script templates.
 
 from os import path
+from formencode import Invalid
+from formencode.validators import OneOf, CIDR, Int
+import logging ; log = logging.getLogger('pymin.services.firewall')
 
-from pymin.seqtools import Sequence
+from pymin.item import Item
+from pymin.validatedclass import Field
 from pymin.dispatcher import Handler, handler, HandlerError
 from pymin.services.util import Restorable, ConfigWriter, ServiceHandler, \
                                 TransactionalHandler, ListSubHandler
 
-__ALL__ = ('FirewallHandler',)
+__all__ = ('FirewallHandler',)
 
-class Rule(Sequence):
+class UpOneOf(OneOf):
+    def validate_python(self, value, state):
+        value = value.upper()
+        return OneOf.validate_python(self, value, state)
+
+class Rule(Item):
     r"""Rule(chain, target[, src[, dst[, ...]]]) -> Rule instance.
 
     chain - INPUT, OUTPUT or FORWARD.
@@ -23,37 +32,23 @@ class Rule(Sequence):
     src_port - Source port (only for UDP or TCP protocols).
     dst_port - Destination port (only for UDP or TCP protocols).
     """
-
-    def __init__(self, chain, target, src=None, dst=None, protocol=None,
-                       src_port=None, dst_port=None):
-        r"Initialize object, see class documentation for details."
-        self.chain = chain
-        self.target = target
-        self.src = src
-        self.dst = dst
-        self.protocol = protocol
-        # TODO Validate that src_port and dst_port could be not None only
-        # if the protocol is UDP or TCP
-        self.src_port = src_port
-        self.dst_port = dst_port
-
-    def update(self, chain=None, target=None, src=None, dst=None, protocol=None,
-                       src_port=None, dst_port=None):
-        r"update([chain[, ...]]) -> Update the values of a rule (see Rule doc)."
-        if chain is not None: self.chain = chain
-        if target is not None: self.target = target
-        if src is not None: self.src = src
-        if dst is not None: self.dst = dst
-        if protocol is not None: self.protocol = protocol
-        # TODO Validate that src_port and dst_port could be not None only
-        # if the protocol is UDP or TCP
-        if src_port is not None: self.src_port = src_port
-        if dst_port is not None: self.dst_port = dst_port
-
-    def as_tuple(self):
-        r"Return a tuple representing the rule."
-        return (self.chain, self.target, self.src, self.dst, self.protocol,
-                    self.src_port, self.dst_port)
+    chain = Field(UpOneOf(['INPUT', 'OUTPUT', 'FORWARD'], not_empty=True))
+    target = Field(UpOneOf(['ACCEPT', 'REJECT', 'DROP'], not_empty=True))
+    src = Field(CIDR(if_empty=None, if_missing=None))
+    dst = Field(CIDR(if_empty=None, if_missing=None))
+    protocol = Field(UpOneOf(['ICMP', 'UDP', 'TCP', 'ALL'], if_missing=None))
+    src_port = Field(Int(min=0, max=65535, if_empty=None, if_missing=None))
+    dst_port = Field(Int(min=0, max=65535, if_empty=None, if_missing=None))
+    def chained_validator(self, fields, state):
+        errors = dict()
+        if fields['protocol'] not in ('TCP', 'UDP'):
+            for name in ('src_port', 'dst_port'):
+                if fields[name] is not None:
+                    errors[name] = u"Should be None if protocol " \
+                            "(%(protocol)s) is not TCP or UDP" % fields
+        if errors:
+            raise Invalid(u"You can't specify any ports if the protocol "
+                        u'is not TCP or UDP', fields, state, error_dict=errors)
 
 class RuleHandler(ListSubHandler):
     r"""RuleHandler(parent) -> RuleHandler instance :: Handle a list of rules.
@@ -93,6 +88,7 @@ class FirewallHandler(Restorable, ConfigWriter, ServiceHandler,
 
     def __init__(self, pickle_dir='.', config_dir='.'):
         r"Initialize the object, see class documentation for details."
+        log.debug(u'FirewallHandler(%r, %r)', pickle_dir, config_dir)
         self._persistent_dir = pickle_dir
         self._config_writer_cfg_dir = config_dir
         self._service_start = ('sh', path.join(self._config_writer_cfg_dir,
@@ -110,6 +106,12 @@ class FirewallHandler(Restorable, ConfigWriter, ServiceHandler,
 
 if __name__ == '__main__':
 
+    logging.basicConfig(
+        level   = logging.DEBUG,
+        format  = '%(asctime)s %(levelname)-8s %(message)s',
+        datefmt = '%H:%M:%S',
+    )
+
     import os
 
     fw_handler = FirewallHandler()
@@ -122,11 +124,11 @@ if __name__ == '__main__':
 
     dump()
 
-    fw_handler.rule.add('input','drop','icmp')
+    fw_handler.rule.add('input', 'drop', protocol='icmp')
 
     fw_handler.rule.update(0, dst='192.168.0.188/32')
 
-    fw_handler.rule.add('output','accept', '192.168.1.0/24')
+    fw_handler.rule.add('output', 'accept', '192.168.1.0/24')
 
     fw_handler.commit()