Add module to control EC2 security groups

library/cloud/ec2_group

@@ -0,0 +1,226 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+
+DOCUMENTATION = '''
+---
+module: ec2_group
+short_description: maintain an ec2 VPC security group.
+description:
+    - maintains ec2 security groups. This module has a dependency on python-boto >= 2.5
+options:
+  name:
+    description:
+      - Name of the security group.
+    required: true
+  description:
+    description:
+      - Description of the security group.
+    required: true
+  vpc_id:
+    description:
+      - ID of the VPC to create the group in.
+    required: true
+  rules:
+    description:
+      - List of firewall rules to enforce in this group (see example).
+    required: true
+  region:
+    description:
+      - the EC2 region to use
+    required: false
+    default: null
+    aliases: []
+  ec2_url:
+    description:
+      - Url to use to connect to EC2 or your Eucalyptus cloud (by default the module will use EC2 endpoints)
+    required: false
+    default: null
+    aliases: []
+  ec2_secret_key:
+    description:
+      - EC2 secret key
+    required: false
+    default: null
+    aliases: []
+  ec2_access_key:
+    description:
+      - EC2 access key
+    required: false
+    default: null
+    aliases: []
+requirements: [ "boto" ]
+'''
+
+EXAMPLES = '''
+- name: example ec2 group
+  local_action:
+    module: ec2_group
+    name: example
+    description: an example EC2 group
+    vpc_id: 12345
+    region: eu-west-1a
+    ec2_secret_key: SECRET
+    ec2_access_key: ACCESS
+    rules:
+      - proto: tcp
+        from_port: 80
+        to_port: 80
+        cidr_ip: 0.0.0.0/0
+      - proto: tcp
+        from_port: 22
+        to_port: 22
+        cidr_ip: 10.0.0.0/8
+      - proto: udp
+        from_port: 10050
+        to_port: 10050
+        cidr_ip: 10.0.0.0/8
+      - proto: udp
+        from_port: 10051
+        to_port: 10051
+        group_id: abcdef
+'''
+
+try:
+    import boto.ec2
+except ImportError:
+    print "failed=True msg='boto required for this module'"
+    sys.exit(1)
+
+
+def addRulesToLookup(rules, prefix, dict):
+    for rule in rules:
+        for grant in rule.grants:
+            dict["%s-%s-%s-%s-%s-%s" % (prefix, rule.ip_protocol, rule.from_port, rule.to_port,
+                                        grant.group_id, grant.cidr_ip)] = rule
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            name=dict(required=True),
+            description=dict(required=True),
+            vpc_id=dict(),
+            rules=dict(),
+            ec2_url=dict(aliases=['EC2_URL']),
+            ec2_secret_key=dict(aliases=['EC2_SECRET_KEY'], no_log=True),
+            ec2_access_key=dict(aliases=['EC2_ACCESS_KEY']),
+            region=dict(choices=['eu-west-1', 'sa-east-1', 'us-east-1', 'ap-northeast-1', 'us-west-2', 'us-west-1', 'ap-southeast-1', 'ap-southeast-2']),
+        ),
+        supports_check_mode=True,
+    )
+    name = module.params['name']
+    description = module.params['description']
+    vpc_id = module.params['vpc_id']
+    rules = module.params['rules']
+    ec2_url = module.params.get('ec2_url')
+    ec2_secret_key = module.params.get('ec2_secret_key')
+    ec2_access_key = module.params.get('ec2_access_key')
+    region = module.params.get('region')
+
+    changed = False
+
+    # allow eucarc environment variables to be used if ansible vars aren't set
+    if not ec2_url and 'EC2_URL' in os.environ:
+        ec2_url = os.environ['EC2_URL']
+    if not ec2_secret_key and 'EC2_SECRET_KEY' in os.environ:
+        ec2_secret_key = os.environ['EC2_SECRET_KEY']
+    if not ec2_access_key and 'EC2_ACCESS_KEY' in os.environ:
+        ec2_access_key = os.environ['EC2_ACCESS_KEY']
+
+    # If we have a region specified, connect to its endpoint.
+    if region:
+        try:
+            ec2 = boto.ec2.connect_to_region(region, aws_access_key_id=ec2_access_key, aws_secret_access_key=ec2_secret_key)
+        except boto.exception.NoAuthHandlerFound, e:
+            module.fail_json(msg=str(e))
+    # Otherwise, no region so we fallback to the old connection method
+    else:
+        try:
+            if ec2_url:  # if we have an URL set, connect to the specified endpoint
+                ec2 = boto.connect_ec2_endpoint(ec2_url, ec2_access_key, ec2_secret_key)
+            else:  # otherwise it's Amazon.
+                ec2 = boto.connect_ec2(ec2_access_key, ec2_secret_key)
+        except boto.exception.NoAuthHandlerFound, e:
+            module.fail_json(msg=str(e))
+
+    # find the group if present
+    group = None
+    groups = {}
+    for curGroup in ec2.get_all_security_groups():
+        groups[curGroup.id] = curGroup
+
+        if curGroup.name == name and curGroup.vpc_id == vpc_id:
+            group = curGroup
+
+    # if found, check the group parameters are correct
+    if group:
+        group_in_use = False
+        rs = ec2.get_all_instances()
+        for r in rs:
+            for i in r.instances:
+                group_in_use |= reduce(lambda x, y: x | (y.name == 'public-ssh'), i.groups, False)
+
+        if group.description != description:
+            if group_in_use:
+                module.fail_json(msg="Group description does not match, but it is in use so cannot be changed.")
+            group.delete()
+            group = None
+
+    # if the group doesn't exist, create it now
+    if not group:
+        if not module.check_mode:
+            group = ec2.create_security_group(name, description, vpc_id=vpc_id)
+        changed = True
+
+    # create a lookup for all existing rules on the group
+    groupRules = {}
+    if group:
+        addRulesToLookup(group.rules, 'in', groupRules)
+
+    # Now, go through all the defined rules and ensure they are there.
+    if rules:
+        for rule in rules:
+            group_id = None
+            ip = None
+            if 'group_id' in rule and 'cidr_ip' in rule:
+                module.fail_json(msg="Specify group_id OR cidr_ip, not both")
+            elif 'group_id' in rule:
+                group_id = rule['group_id']
+            elif 'cidr_ip' in rule:
+                ip = rule['cidr_ip']
+
+            if rule['proto'] == 'all':
+                rule['proto'] = -1
+                rule['from_port'] = None
+                rule['to_port'] = None
+
+            ruleId = "%s-%s-%s-%s-%s-%s" % ('in', rule['proto'], rule['from_port'], rule['to_port'], group_id, ip)
+            if ruleId in groupRules:
+                del groupRules[ruleId]
+                continue
+
+            grantGroup = None
+            if group_id:
+                grantGroup = groups[group_id]
+
+            if not module.check_mode:
+                group.authorize(rule['proto'], rule['from_port'], rule['to_port'], ip, grantGroup)
+            changed = True
+
+    # Finally, remove anything left in the groupRules -- these will be defunct rules
+    for rule in groupRules.itervalues():
+        for grant in rule.grants:
+            grantGroup = None
+            if grant.group_id:
+                grantGroup = groups[grant.group_id]
+            if not module.check_mode:
+                group.revoke(rule.ip_protocol, rule.from_port, rule.to_port, grant.cidr_ip, grantGroup)
+            changed = True
+
+    if not group:
+        module.exit_json(changed=changed, group_id=None)
+    module.exit_json(changed=changed, group_id=group.id)
+
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+main()