conntrackt Changeset - 353630bdfef6

Changeset - 353630bdfef6

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Branko Majic (branko) - 12 years ago 2013-11-09 13:50:30
branko@majic.rs

CONNT-17: Added helper method for the Project model for obtaining a summary of communcations that can be then easily output in a table.

1 file changed with 45 insertions and 1 deletions:

conntrackt/models.py

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conntrackt/models.py

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 # -*- coding: utf-8 -*-
+#
 # Copyright (C) 2013 Branko Majic
+#
 # This file is part of Django Conntrackt.
+#
 # Django Conntrackt is free software: you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by the Free
 # Software Foundation, either version 3 of the License, or (at your option) any
 # later version.
+#
 # Django Conntrackt 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
 # Django Conntrackt.  If not, see <http://www.gnu.org/licenses/>.
+#
 # Django imports.
 from django.contrib.admin.util import NestedObjects
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
 from django.db import models
 from django.db.models.query_utils import Q
 # Application imports.
 from .utils import list_formatter_callback
+from .utils import list_formatter_callback, get_distinct_colors
 class SearchManager(models.Manager):
     """
     Custom model manager that implements search for model instances that contain
     a specific string (search term) in fields "name" or "description".
     """
     def search(self, search_term):
         """
         Performs a search for model instances that contain the provided search
         term in fields "name" or "description". The search is case-insensitive.
         Arguments:
           search_term - String to search the name and description for.
         Returns:
           Query set with model instances that matched the search.
         """
         return self.filter(Q(name__icontains=search_term) | Q(description__icontains=search_term))
 class RelatedCollectorMixin(object):
     """
     Implements model mixin for easily obtainning related items of a model
     instance.
     The mixin can be used for obtaining all model objects that are directly or
     indirectly linked to the calling model object (through foreign key
     relationships).
     This mixin is very useful in delete views for warning the user about all of
     the related items that will be deleted if the calling item is deleted as
     well.
     """
     def get_dependant_objects(self):
         """
         Creates a list of model objects that depend (reference), both directly
         and indirectly, on calling model object. The calling model object is
         included as the first element of the list. This method call can be used
         in order to obtain a list of model objects that would get deleted in
         case the calling model object gets deleted.
         Returns:
           Nested list of model objects that depend (reference) calling model
           object.
         """
         collector = NestedObjects(using='default')
         collector.collect([self])
         return collector.nested()
     def get_dependant_objects_representation(self):
         """
         Creates a nested list of object representations that depend (reference),
         both directly and indirectly, calling model object. This method call can
         be used in order to obtain a list of string representations of model
         objects that would get deleted in case the calling model object gets
         deleted.
         The resulting nested list can be shown to the user for
         warning/notification purposes using the unordered_list template tag.
         Each non-list element will be a string generated using the
         conntrackt.utils.list_formatter_callback function.
         Returns:
           Nested list of representations of model objects that depend
           (reference) calling model object.
         """
         collector = NestedObjects(using='default')
         collector.collect([self])
         return collector.nested(list_formatter_callback)
 class Project(RelatedCollectorMixin, models.Model):
     """
     Implements a model with information about a project. A project has some
     basic settings, and mainly serves the purpose of grouping entities for
     easier handling and administration.
     Fields:
       name - String denoting the project name.
       description - Free-form description of the project.
     """
     name = models.CharField(max_length=100, unique=True)
     description = models.TextField(blank=True)
     objects = SearchManager()
     deletion_collect_models = ["Entity", "Interface"]
     class Meta:
         permissions = (("view", "Can view information"),)
     def __unicode__(self):
         """
         Returns:
           String representation of a project.
         """
         return self.name
     def get_absolute_url(self):
         """
         Return absolute URL for viewing a single project.
         """
         return reverse("project", kwargs={'pk': self.pk})
     def get_project_communications_summary(self):
         """
         Creates a list of dictionaries where each dictionary provides summary of
         a communication. Each dictionary will contain the following keys:
         - source - Source of the communication.
         - source_color - Color that is associated with the source of
           communication. The color will match with color used in the project
           communications diagram.
         - destination - Destination of the communication.
         - destination_color - Color that is associated with the destination of
           communication. The color will match with color used in the project
           communications diagram.
         - protocol - Protocol used for communication.
         - port - Port used for communication.
         Returns:
           List of dictionaries, where each dictionary describes a single communication.
         """
         # Obtain the list of colors.
         colors = get_distinct_colors(self.entity_set.count())
         # Fetch ID's of each end entity.
         entity_ids = self.entity_set.values_list("pk", flat=True).order_by("pk")
         # Map the entity ID's to generated colors.
         entity_colors = dict(zip(entity_ids, colors))
         # Set-up an empty list where the resulting data will be stored.
         communications = []
         # Process each communication, and add the information to result.
         for communication in Communication.objects.filter(source__entity__project=self).select_related().order_by("source__entity__pk"):
             communications.append({"source": communication.source.entity.name,
                                    "source_color": entity_colors[communication.source.entity.pk],
                                    "destination": communication.destination.entity.name,
                                    "destination_color": entity_colors[communication.destination.entity.pk],
                                    "protocol": communication.protocol,
                                    "port": communication.port,})
         # Finally return the result.
         return communications
 class Location(RelatedCollectorMixin, models.Model):
     """
     Implements a model with information about location. Locations can further be
     assigned to entities, letting the user group different servers and equipment
     based on location.
     Locations are not tied to specific project, and they do not have to be
     actual physical locations. Such generic locations are therefore reusable
     accross multiple projects.
     For example, locations can be:
       - Main site
       - Backup site
       - Disaster recovery site
       - Belgrade
       - Stockholm
     Fields:
       name - String denoting the location name.
       description - Free-form description of a location.
     """
     name = models.CharField(max_length=100, unique=True)
     description = models.TextField(blank=True)
     def __unicode__(self):
         """
         Returns:
           String representation of a location.
         """
         return self.name
 class Entity(RelatedCollectorMixin, models.Model):
     """
     Models an entity in a project. An entity can be a server, router, or any
     other piece of networking equipment that has its own IP address.
     Entities can also be used for representing subnets etc. This is useful when
     the communication restrictions need to be applied across a subnet.
     Entities are tied to specific projects and locations.
     Fields:
       name - String denoting the entity name.
       description - Free-form description of an entity.
       project - Foreign key pointing to the project to which the entity
       belongs.
       location - Foreign key pointing to the location at which the entity is
       located.
     """
     name = models.CharField(max_length=100)
     description = models.TextField(blank=True)
     project = models.ForeignKey(Project)
     location = models.ForeignKey(Location)
     objects = SearchManager()
     class Meta:
         # Fix the plural form used by Django.
         verbose_name_plural = 'entities'
         # Enforce uniqueness of entity name in a project.
         unique_together = ("name", "project")
     def __unicode__(self):
         """
         Returns:
           String representation of an entity. This identifier contains name of
           entity, its project name, and location name.
         """
         return "%s (%s - %s)" % (self.name, self.project, self.location)
     def incoming_communications(self):
         """
         Returns:
           List of incoming communications for an entity.
         """
         communications = []
         for interface in self.interface_set.all():
             for communication in interface.destination_set.all():
                 communications.append(communication)
         return communications
     def outgoing_communications(self):
         """
         Returns:
           List of outgoing communications for an entity.
         """
         communications = []
         for interface in self.interface_set.all():
             for communication in interface.source_set.all():
                 communications.append(communication)
         return communications
     def get_absolute_url(self):
         """
         Return absolute URL for viewing a single entity.
         """
         return reverse("entity", kwargs={'pk': self.pk})
     def clean(self):
         """
         Performs additional validation checks on the submitted data. It will
         verify the following:
           - That entity is not linked to any other entity in case of project
             change.
         """
         # Perform the check if entity is being updated.
         if self.pk:
             # Fetch the old data from database.
             # @TODO: Is it better to do copying during __init__ instead?
             old_object = Entity.objects.get(pk=1)
             # Make sure that entity has no communications in current project if
             # moving it around.
             if self.project != old_object.project and (self.incoming_communications() or self.outgoing_communications()):
                 raise ValidationError("The entity cannot be moved to different project as long as it has valid communications with entities in current project.")
 class Interface(RelatedCollectorMixin, models.Model):
     """
     Models a representation of an interface on an entity. It can be used for
     representing the subnets as well.
     Each interface is coupled with a specific Entity.
     Fields:
       name - String denoting the interface name. For example 'eth0', 'eth1'
       etc.
       description - Free-form description of an interface.
       entity - Foreign key pointing to the entity to which the interface
       belongs.
       address - IP address of an interface. It's possible to store network
       address in it as well.
       netmask - Netmask of the interface. By default this is /32
       (255.255.255.255), but in case of subnet entities this can be used for
       denoting the network netmask.
     """
     name = models.CharField(max_length=100, default='eth0')
     description = models.TextField(blank=True, default='Main network interface.')
     entity = models.ForeignKey(Entity)
     address = models.IPAddressField()
     netmask = models.IPAddressField(default='255.255.255.255')
     class Meta:
         # Enforce uniqueness of interface name in an entity. Enforce uniqueness
         # of IP address in a subnet for an entity.
         unique_together = (("name", "entity"),
                            ("entity", "address", "netmask"),)
     def __unicode__(self):
         """
         Returns:
           String representation of an interface. In case of single IP this will
           simply be the interface name and IP address. In case of subnet it will
           include the netmask as well.
         """
         if self.netmask == '255.255.255.255':
             return '%s (%s)' % (self.entity.name, self.address)
         else:
             return '%s (%s/%s)' % (self.entity.name, self.address, self.netmask)
 class Communication(RelatedCollectorMixin, models.Model):
     """
     Models a representation of allowed network communication. This lets the user
     display the possible network connections that should be allowed. Information
     from the communication instances is also used for generating the iptables
     rules for the entities.
     Communication instances allow the user to specify one of the three possible
     protocols and related information:
       - TCP, along with the TCP port.
       - UDP, along with the UDP port.
       - ICMP, along with the ICMP type.
     Allowed communication is always represented as combination of source
     interface, destination interface, protocol, and port/ICMP type.
     Fields:
       source - Foreign key to the source (originating) interface. The
       communication is expected to come _from_ the source.
       destination - Foreign key to the destination interface. The destination
       interface is expected to be able to accept incoming connections
       (i.e. entity's servers are listening on those).
       protocol - Textual field denoting the protocol that is used for
       communication. This can be 'TCP', 'UDP', or 'ICMP'.
       port - Port number used by the protocol. In case of ICMP, this is an ICMP
       type (in numeric form).
       description - Free-form text that can be used to describe the
       communication. This is also used when generating the iptables rules for
       documenting the rules.
     """
     PROTOCOL_CHOICES = (
         ('TCP', 'TCP'),
         ('UDP', 'UDP'),
         ('ICMP', 'ICMP'),
+        )
     source = models.ForeignKey(Interface, related_name='source_set')
     destination = models.ForeignKey(Interface, related_name='destination_set')
     protocol = models.CharField(max_length=10, choices=PROTOCOL_CHOICES)
     port = models.IntegerField(default=0)
     description = models.TextField(blank=True)
     class Meta:
         # Enforce uniqueness of communication.
         unique_together = ("source", "destination", "protocol", "port")
     def __unicode__(self):
         """
         Returns:
           String representation of an interface. This involves showing the
           source and destination _entity_ name, protocol, and port.
         """
         return "%s -> %s (%s:%s)" % (self.source.entity.name, self.destination.entity.name, self.protocol, self.port)
     def clean(self):
         """
         Performs additional validation checks on the submitted data. It will
         verify the following:
           - That source and destination interface belongs to distinct entities.
           - That the specified protocol is supported.
         """
         if self.source.entity == self.destination.entity:
             raise ValidationError('Source and destination entities are identical.')
         if self.source.entity.project != self.destination.entity.project:
             raise ValidationError('Source and destination entities do not belong to the same project')
         if (self.protocol.upper(), self.protocol.upper()) not in self.PROTOCOL_CHOICES:
             raise ValidationError('%s is not a supported protocol.' % self.protocol)
     def edit_link(self):
         """
         This method is used for providing an additional 'Edit' link in the admin
         site for the communication instances (for the display_list).
         This provides ability to let all of the other fields of a communication
         instance to be editable.
         """
         return "Edit"
     def source_representation(self):
         """
         Produces string representation of communication that includes only the
         source interface information.
         The method is useful where the destination context is well known.
         Returns:
             Communication representation that includes only information about
             the source interface.
         """
         return "%s - %s: %d" % (self.source, self.protocol, self.port)
     def destination_representation(self):
         """
         Produces string representation of communication that includes only the
         destination interface information.
         The method is useful where the source context is well known.
         Returns:
             Communication representation that includes only information about
             the destination interface.
         """
         return "%s - %s: %d" % (self.destination, self.protocol, self.port)

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