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capirca

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Table of Contents

Overview

Capirca is a designed to utilize common definitions of networks, services and high-level policy files to facilitate the development and manipulation of network access control lists (ACLs) for various platforms. It was developed by Google for internal use, and is now open source.

Capirca consists of capirca Python package and the accompanying aclgen tool.

The typical usage workflow consists of the following steps:

  1. Create object definitions containing "network" and "service" definitions
  2. Create a access control policy defining the desired state of access control and referencing the object definitions together with desired firewall platforms
  3. Generate ACL configurations by running aclgen command referencing the access control policy and the object definitions. The command triggers a generator for each of the firewall platforms.

Key Concepts

Object Definitions

Object definitions is a collection of files containing the definitions for network and service objects used to describe the desired state of access control.

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Directory Structure

The tool populates the object definitions from a set of files in a specified directory, e.g. def. These files may NOT reference other network and service definition files located outside of the directory.

For example, the def directory consists of two files:

A user may create multiple network and service definitions files to facilitate the grouping of related definitions, and/or to utilize filesystem permissions to restrict or permit the editing of files by specific groups.

The use of a revision control system, such as git, perforce, or subversion, is a recommended way to ensure historical change control and tracking of contributor changes.

Each network or service definition file has a very simple structure. A token is defined, e.g. GUEST_NET, followed by an equal sign, then followed by a definition, e.g. 10.10.10.0/24, and optional description field, e.g. # guest network range.

GUEST_NET = 10.10.10.0/24      # guest network range

The tool populates the access control policy from .pol files in a particular directory, e.g. policies/. The tool searches recursively for .pol files and add them to the policy, .e.g .pol files are located in policies/pol.

Additionally, the .pol files MAY reference other policy definition files located outside of the directory by using include directive. Please see Includes section for documentation.

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Network Objects

The files with .net extension contain the definitions of network objects, e.g. IP networks and hosts. The following definition creates INTERNAL and RFC1918 network objects in the object definitions, whether INTERNAL references the IP ranges of RFC 1918 defined in the RFC1918.

RFC1918 = 10.0.0.0/8      # non-public
          172.16.0.0/12   # non-public
          192.168.0.0/16  # non-public

INTERNAL = RFC1918

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Service Objects

The files with .svc extension contain the definitions of service objects, e.g. ports and protocols.

DNS = 53/tcp  # transfers
      53/udp  # queries

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Object Nesting

The nesting of tokens is permitted only when both tokens are of the same type. The referencing of a "network" object by "service" object is not allowed, and vice versa.

The examples of nesting of the network and service object follow.

HTTP = 80/tcp               # common web
HTTPS = 443/tcp             # SSL web
HTTP_8080 = 8080/tcp        #  web on non-standard port
WEB_SERVICES = HTTP HTTP_8080 HTTPS  # all our web services
DB_SERVICES = 3306/tcp      # allow db access
              HTTPS         # and SSL access
NYC_NETWORK = 200.1.1.0/24  # New York office
ATL_NETWORK = 200.2.1.0/24  # Atlanta office
DEN_NETWORK = 200.5.1.0/24  # Denver office
REMOTE_OFFICES = NYC_NETWORK
                 ATL_NETWORK
                 DEN_NETWORK

The network objects may reference both IPv4 and IPv6 addresses at the same time.

LOOPBACK = 127.0.0.1/32          # loopback in IPv4
           ::1/128               # loopback in IPv6
LINKLOCAL = FE80::/10            # IPv6 link local address
NYC_NETWORK = 172.16.1.0/24      # NYC IPv4
              2620:0:10A1::/48   # NYC IPv6

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Access Control Policy

Policy Components

The access control policy describes the desired network security policy through the use of a high-level language that uses keywords and tokens.

The tokens are the names of services and networks loaded from the object definitions, e.g. HTTPS and NYC_NETWORK.

The keywords are the header and term statements referencing target firewall platforms with corresponding parameters and defining an ACL.

The access control policy is a collection of ACLs stored in a policy file with.pol extension.

Each ACL consists of one or more header section, each followed by one or more term sections.

The header section defines target firewall platforms and passes arguments to the generator responsible for the platform.

The term section specifies the network flow metadata for ACL matching, e.g. addresses, ports, protocols and actions.

For example, this ACL targets Palo Alto firewall platform. It controls traffic from internal to external zones, i.e. outbound traffic. It allows ICMP traffic from INTERNAL network object to GOOGLE_DNS network object.

header {
  target:: paloalto from-zone internal to-zone external
}

term ping-gdns{
  source-address:: INTERNAL
  destination-address:: GOOGLE_DNS
  protocol:: icmp
  action:: accept
}

Importantly, the above ACL controls traffic in one direction only, in the outbound direction. Practically though, there should also be another ACL, i.e. header and term keywords, UNLESS the target generator allows the the creation of bi-directional configuration output for a single ACL. Please see documentation of individual generators.

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Header Section

The header section is used to define the type of ACL, a descriptor or name, direction (if applicable) and format (ipv4/ipv6).

For example, the following simple header defines an ACL that can generate output for juniper, cisco and iptables formats.

header {
  comment:: "Example header for juniper and iptables filter."
  target:: juniper edge-filter
  target:: speedway INPUT
  target:: iptables INPUT
  target:: cisco edge-filter
}

Notice, that the 1st target has 2 arguments: juniper and edge_filter. The first argument specifies that the ACL can be rendered for Juniper JCLs, and that the output ACL should be called edge_filter.

The 2nd and 3rd target also has 2 arguments: speedway and INPUT. Since Speedway and iptables has specific inherent ACL names (aka chain names), such as INPUT, OUTPUT, and FORWARD, the target specification for iptables usually points to one of these chain names although a custom chain can be specified (usually for combining with other rules through the use of a jump directive from one of the default iptables filters).

Likewise, the 4th target, cisco simply specifies the name of the access control list to be generated.

Each target platform may have different possible arguments, which are detailed in the following subsections.

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Terms Section

The term sections defines access control rules within an ACL. Once the header section of an ACL is defined, it is followed by one or more terms. The terms are enclosed in brackets and use keywords to specify the functionality of a specific access control.

A term section begins with the keyword term, followed by the term's name. Opening and closing brackets follow, which include the keywords and tokens to define the matching and action of the access control term.

There are two categories of the keywords:

  • required: must be supported by all output policy generators
  • optional: available in a subset of the generators and are intended to provide additional flexibility when developing policies on a single target platform.

The ability to abstract and normalize the language engineers use to describe their intended policy is at the core of capirca.

  • Allows the same language be used across multiple platforms
  • Concepts are normalized and aligned so that a single policy file can be generated across multiple generators without needing changes.

Therefore, its appropriate and encouraged to use more keywords as long as they are functional and can be normalized.

A generator may silently ignore optional ACL keywords which it does not support, unless the keywords affect the security properties of the ACL.

WARNING: When developing filters that are intended to be rendered across multiple generators (e.g cisco, iptables, juniper, etc.) it is strongly recommended to only use the required keywords in policy terms. It help ensure each platform's rendered filter will contain compatible security policies.

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Policy Generator

A policy generator is a Python object that takes in an ACL and outputs a configuration applicable to the targets describes in the policy.

Required Term Keywords

The required keywords supported by all generators follow.

Importantly, the generators using the below term keywords may not all handle the associated values (sometimes called sub-actions) correctly. Therefore, please validate that the generator you use produces expected ACL output.

  • action: the action to take when matched
    • accept
    • deny
    • reject
    • next
    • reject-with-tcp-rst
  • comment: a text comment enclosed in double-quotes. The comment can extend over multiple lines if desired, until a closing quote is encountered.
  • destination-address: one or more destination address tokens
  • destination-exclude: exclude one or more address tokens from the specified destination-address
  • destination-port: one or more service definition tokens
  • icmp-type: specify icmp-type code to match.
    • IPv4:
      • echo-reply
      • unreachable
      • source-quench
      • redirect
      • alternate-address
      • echo-request
      • router-advertisement
      • router-solicitation
      • time-exceeded
      • parameter-problem
      • timestamp-request
      • timestamp-reply
      • information-request
      • information-reply
      • mask-request
      • mask-reply
      • conversion-error
      • mobile-redirect
    • IPv6:
      • destination-unreachable
      • packet-too-big
      • time-exceeded
      • parameter-problem
      • echo-request
      • echo-reply
      • multicast-listener-query
      • multicast-listener-report
      • multicast-listener-done
      • router-solicit
      • router-advertisement
      • neighbor-solicit
      • neighbor-advertisement
      • redirect-message
      • router-renumbering
      • icmp-node-information-query
      • icmp-node-information-response
      • inverse-neighbor-discovery-solicitation
      • inverse-neighbor-discovery-advertisement
      • version-2-multicast-listener-report
      • home-agent-address-discovery-request
      • home-agent-address-discovery-reply
      • mobile-prefix-solicitation
      • mobile-prefix-advertisement
      • certification-path-solicitation
      • certification-path-advertisement
      • multicast-router-advertisement
      • multicast-router-solicitation
      • multicast-router-termination
  • option: connection options
    • established: only permit established connections; implements tcp-established flag if protocol is tcp only, otherwise adds 1024-65535 to required destination-ports.
    • tcp-established: only permit established tcp connections, usually checked based on TCP flag settings. If protocol UDP is included in term, only adds 1024-65535 to required destination-ports.
    • sample: not supported by all generators. Samples traffic for netflow.
    • intial: currently only supported by juniper generator. Appends tcp-initial to the term.
    • rst: currently only supported by juniper generator. Appends "tcp-flags rst" to the term.
    • first-fragment: currently only supported by juniper generator. Appends 'first-fragment' to the term.
  • protocol: the network protocols this term will match, such as tcp, udp, icmp, or a numeric value.
  • protocol-except: network protocols that should be excluded from the protocol specification. This is rarely used.
  • source-address: one or more source address tokens
  • source-exclude: exclude one or more address tokens from the specified source-address
  • source-port: one or more service definition tokens
  • verbatim: this specifies that the text enclosed within quotes should be rendered into the output without interpretation or modification. This is sometimes used as a temporary workaround while new required features are being added.

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Optional Term Keywords

The keywords are optionally supported. These may or may not function properly on all generators. Therefore, refer to the documentation of individual generators in the next section.

  • address: one or more network address tokens matches either source or destination
  • counter: juniper only, update a counter for matching packets
  • encapsulate: juniper only, enable filter-based generic routing encapsulation (GRE) tunneling using the specified tunnel template
  • destination-prefix: juniper only, specify destination-prefix matching (e.g. source-prefix` configured-neighbors-only)
  • ether-type: juniper only, specify matching ether-type(e.g. ether-type` arp)
  • fragement-offset: juniper only, specify a fragment offset of a fragmented packet
  • logging: supported juniper and iptables/speedway, specify that this packet should be logged via syslog
  • loss-priority: juniper only, specify loss priority
  • packet-length: juniper only, specify packet length
  • policer: juniper only, specify which policer to apply to matching packets
  • precedence: juniper only, specify precendence
  • qos: juniper only, apply quality of service classification to matching packets (e.g. qos` af4)
  • routing-instance: juniper only, specify routing instance for matching packets
  • source-interface: iptables and speedway only, specify specific interface a term should apply to (e.g. source-interface` eth3)
  • source-prefix: juniper only, specify source-prefix matching (e.g. source-prefix, configured-neighbors-only)
  • traffic-type: juniper only, specify traffic-type

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Term Keywords By Generator

The following list contains links to the documentation of the individual policy generators:

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Term Examples

The following are examples of how to construct a term, and assumes that naming definition tokens used have been defined in the definitions files.

  • Block incoming bogons and spoofed traffic
term block-bogons {
  source-address:: BOGONS RFC1918
  source-address:: COMPANY_INTERNAL
  action:: deny
}
  • Permit Public to Web Servers
term permit-to-web-servers {
  destination-address:: WEB_SERVERS
  destination-port:: HTTP
  protocol:: tcp
  action:: accept
}
  • Permit Replies to DNS Servers From Primaries
term permit-dns-tcp-replies {
  source-address:: DNS_PRIMARIES
  destination-address:: DNS_SECONDARIES
  source-address:: DNS
  protocol:: tcp
  option:: tcp-established
  action:: accept
}
  • Permit All Corporate Networks, Except New York, to FTP Server

This will "subtract" the CORP_NYC_NETBLOCK from the CORP_NETBLOCKS token. For example, assume CORP_NETBLOCKS includes 200.0.0.0/20, and CORP_NYC_NETBLOCK is defined as 200.2.0.0/24. The source-exclude will remove the NYC netblock from the permitted source addresses. If the excluded address is not contained with the source address, nothing is changed.

term allow-inbound-ftp-from-corp {
  source-address:: CORP_NETBLOCKS
  source-exclude:: CORP_NYC_NETBLOCK
  destination-port:: FTP
  protocol:: tcp
  action:: accept
}

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Includes

The policy language supports the use of #include statements. An include can be used to avoid duplication of commonly used text, such as a group of terms that permit or block specific types of traffic.

An include directive will result in the contents of the included file being injected into the current policy at the exact location of the include directive.

The include directive has the following format:

#include 'policies/includes/untrusted-networks-blocking.inc'

The .inc file extension and the include in the directory path are not required. However, it is a practical way to diff to help differentiate the included policy files from typical policy files.

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Example Policy File

Below is an example policy file for a Juniper target platform. It contains two filters, each with a handful of terms. This examples assumes that the network and service naming definition tokens have been defined.

header {
  comment:: "edge input filter for sample network."
  target:: juniper edge-inbound
}
term discard-spoofs {
  source-address:: RFC1918
  action:: deny
}
term permit-ipsec-access {
  source-address:: REMOTE_OFFICES
  destination-address:: VPN_HUB
  protocol:: 50
  action:: accept
}
term permit-ike-access {
  source-address:: REMOTE_OFFICES
  destination-address:: VPN_HUB
  protocol:: udp
  destination-port:: IKE
  action:: accept
}
term permit-public-web-access {
  destination-address:: WEB_SERVERS
  destination-port:: HTTP HTTPS HTTP_8080
  protocol:: tcp
  action:: accept
}
term permit-tcp-replies {
  option:: tcp-established
  action:: accept
}
term default-deny {
  action:: deny
}

header {
  comment:: "edge output filter for sample network."
  target:: juniper edge-outbound
}
term drop-internal-sourced-outbound {
  destination-address:: INTERNAL
  destination-address:: RESERVED
  action:: deny
}
term reject-internal {
  source-address:: INTERNAL
  action:: reject
}
term default-accept {
  action:: accept
}

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Getting Started

Installation

From Source

If setuptools Python package is not installed on your system, install it: For example, the following commands installs the package with apt package manager.

sudo apt-get install python3-pip python3-setuptools

Next, to install capirca from source, clone the capirca repository and run its installer:

git clone https://github.com/google/capirca.git
cd capirca/
python3 setup.py install --user

Typically, when provided --user argument, the installer creates the following files, where 3.8 is Python version and 2.0.0 is the version of capirca:

  • ~/.local/bin/aclgen
  • ~/.local/lib/python3.8/site-packages/capirca-2.0.0-py3.8.egg

If necessary, remove build files:

rm -rf build capirca.egg-info dist

Next, test aclgen by generating sample output filters for Cisco, Juniper, iptables, and other firewall platforms.

~/.local/bin/aclgen

The generation of sample output while in the capirca's source code directory does not require command line parameters, because aclgen inherits default settings from the following configuration (see capirca/utils/config.py).

{
    'base_directory': './policies',
    'definitions_directory': './def',
    'policy_file': None,
    'output_directory': './filters',
    'optimize': False,
    'recursive': True,
    'debug': False,
    'verbose': False,
    'ignore_directories': ['DEPRECATED', 'def'],
    'max_renderers': 10,
    'shade_check': False,
    'exp_info': 2
}

Although the policy_file is None, the tool processes all policies located in base_directory, i.e. ./policies. The tool loads network and service definitions from definitions_directory. The tool output generated ACLs to the root of the source directory because output_directory is ./filters.

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Package Manager

Currently, the PyPI is out of date. Nevertheless, a user can install an older version of capirca with pip:

pip install capirca --user

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Basic Usage

There are a number of command-line arguments that can be used with capirca.

$ ~/.local/bin/aclgen --helpfull

       USAGE: aclgen [flags]
flags:

absl.app:
  -?,--[no]help: show this help
    (default: 'false')
  --[no]helpfull: show full help
    (default: 'false')
  --[no]helpshort: show this help
    (default: 'false')
  --[no]helpxml: like --helpfull, but generates XML output
    (default: 'false')
  --[no]only_check_args: Set to true to validate args and exit.
    (default: 'false')
  --[no]pdb: Alias for --pdb_post_mortem.
    (default: 'false')
  --[no]pdb_post_mortem: Set to true to handle uncaught exceptions with PDB post mortem.
    (default: 'false')
  --profile_file: Dump profile information to a file (for python -m pstats). Implies --run_with_profiling.
  --[no]run_with_pdb: Set to true for PDB debug mode
    (default: 'false')
  --[no]run_with_profiling: Set to true for profiling the script. Execution will be slower, and the output format might change over time.
    (default: 'false')
  --[no]use_cprofile_for_profiling: Use cProfile instead of the profile module for profiling. This has no effect unless --run_with_profiling
    is set.
    (default: 'true')

absl.logging:
  --[no]alsologtostderr: also log to stderr?
    (default: 'false')
  --log_dir: directory to write logfiles into
    (default: '')
  --logger_levels: Specify log level of loggers. The format is a CSV list of `name:level`. Where `name` is the logger name used with
    `logging.getLogger()`, and `level` is a level name  (INFO, DEBUG, etc). e.g. `myapp.foo:INFO,other.logger:DEBUG`
    (default: '')
  --[no]logtostderr: Should only log to stderr?
    (default: 'false')
  --[no]showprefixforinfo: If False, do not prepend prefix to info messages when it's logged to stderr, --verbosity is set to INFO level,
    and python logging is used.
    (default: 'true')
  --stderrthreshold: log messages at this level, or more severe, to stderr in addition to the logfile.  Possible values are 'debug', 'info',
    'warning', 'error', and 'fatal'.  Obsoletes --alsologtostderr. Using --alsologtostderr cancels the effect of this flag. Please also note
    that this flag is subject to --verbosity and requires logfile not be stderr.
    (default: 'fatal')
  -v,--verbosity: Logging verbosity level. Messages logged at this level or lower will be included. Set to 1 for debug logging. If the flag
    was not set or supplied, the value will be changed from the default of -1 (warning) to 0 (info) after flags are parsed.
    (default: '-1')
    (an integer)

capirca.aclgen:
  --base_directory: The base directory to look for acls; typically where you'd find ./corp and ./prod
    (default: './policies')
  --config_file: A yaml file with the configuration options for capirca;
    repeat this option to specify a list of values
  --[no]debug: Debug messages
    (default: 'false')
  --definitions_directory: Directory where the definitions can be found.
    (default: './def')
  --exp_info: Print a info message when a term is set to expire in that many weeks.
    (default: '2')
    (an integer)
  --ignore_directories: Don't descend into directories that look like this string
    (default: 'DEPRECATED,def')
    (a comma separated list)
  --max_renderers: Max number of rendering processes to use.
    (default: '10')
    (an integer)
  -o,--[no]optimize: Turn on optimization.
    (default: 'False')
  --output_directory: Directory to output the rendered acls.
    (default: './filters')
  --policy_file: Individual policy file to generate.
  --[no]recursive: Descend recursively from the base directory rendering acls
    (default: 'true')
  --[no]shade_check: Raise an error when a term is completely shaded by a prior term.
    (default: 'false')
  --[no]verbose: Verbose messages
    (default: 'false')

absl.flags:
  --flagfile: Insert flag definitions from the given file into the command line.
    (default: '')
  --undefok: comma-separated list of flag names that it is okay to specify on the command line even if the program does not define a flag
    with that name.  IMPORTANT: flags in this list that have arguments MUST use the --flag=value format.
    (default: '')

Notably, the --config_file PATH argument allows passing one or more yaml configuration files. These files will be prioritized from left to right, i.e. any duplicate configurations will be overriden, not merged.

The command line arguments take precendence over any settings passed via the configuration files.

The default capirca configurations in a YAML format follows:

---
base_directory: ./policies
definitions_directory: ./def
output_directory: ./
optimize: false
recursive: true
debug: false
verbose: false
ignore_directories:
  - DEPRECATED
  - def
max_renderers: 10
shade_check: true
exp_info: 2

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Python Package

The aclgen tool uses capirca Python package.

Therefore, there is a way to access capirca programmatically.

  • policies/sample_paloalto.pol
  • def/SERVICES.svc
  • def/NETWORK.net

Provided you have the following files in your directory, the following code snippets create a naming definitions object, policy object, and render generator filter output.

NOTE: Paste the code snippets one line at a time.

First, start Python interpreter:

$ python3
Python 3.8.7 (default, Dec 22 2020, 10:37:26)
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

Next, import naming library and create naming object from definitions files in ./def directory.

from pprint import pprint
from capirca.lib import naming
defs = naming.Naming('./def')
pprint(defs)
<capirca.lib.naming.Naming object at 0x7f8421b57280>

The defs object follows:

<capirca.lib.naming.Naming object at 0x7f8421b57280>

The Naming object has various methods. The GetServiceNames method returns the service name tokens.

>>> dir(defs)
['GetIpParents', 'GetNet', 'GetNetAddr', 'GetNetChildren', 'GetServiceNames',
 <...intentionally omitted ..>
'unseen_networks', 'unseen_services']
>>>

>>> pprint(defs.GetServiceNames())
['WHOIS',
 'SSH',
 <...intentionally omitted ..>
 'TRACEROUTE']
>>>

Then, import policy library, read in the policy configuration data from ./policies/sample_paloalto.pol, and create a policy object.

from capirca.lib import policy
conf = open('./policies/sample_paloalto.pol').read()
pol = policy.ParsePolicy(conf, defs, optimize=True)

The policy object follows:

>>> pprint(pol)
Policy: {Target[paloalto], Comments [], Apply groups: [], except: []:[ name: ping-gdns
  source_address: [IPv4('10.0.0.0/8'), IPv4('172.16.0.0/12'), IPv4('192.168.0.0/16')]
  destination_address: [IPv4('8.8.4.4/32'), IPv4('8.8.8.8/32'), IPv6('2001:4860:4860::8844/128'), IPv6('2001:4860:4860::8888/128')]
  protocol: ['icmp']
  action: ['accept'],  name: dns-gdns
  source_address: [IPv4('10.0.0.0/8'), IPv4('172.16.0.0/12'), IPv4('192.168.0.0/16')]
  destination_address: [IPv4('8.8.4.4/32'), IPv4('8.8.8.8/32'), IPv6('2001:4860:4860::8844/128'), IPv6('2001:4860:4860::8888/128')]
  protocol: ['tcp']
  destination_port: [(53, 53)]
  action: ['accept'],  name: allow-web-outbound
  source_address: [IPv4('10.0.0.0/8'), IPv4('172.16.0.0/12'), IPv4('192.168.0.0/16')]
  protocol: ['tcp']
  destination_port: [(80, 80), (443, 443)]
  action: ['accept']], Target[paloalto], Comments [], Apply groups: [], except: []:[ name: allow-icmp
  protocol: ['icmp']
  action: ['accept'],  name: allow-only-pan-app
  action: ['accept']
  pan_application: ['http'],  name: allow-web-inbound
  destination_address: [IPv4('200.1.1.1/32'), IPv4('200.1.1.2/32')]
  protocol: ['tcp']
  destination_port: [(80, 80), (443, 443)]
  action: ['accept']
  pan_application: ['ssl', 'http']]}
>>>

Next, import a generator library (here paloaltofw for Palo Alto firewalls) and output a policy in the desired format.

from capirca.lib import paloaltofw
for header in pol.headers:
  if 'paloalto' in header.platforms:
    jcl = True
  if jcl:
    output = paloaltofw.PaloAltoFW(pol, 1)
    print(output)

The following code initiates Palo Alto firewall ACL model with the default expiration of 1 week.

paloaltofw.PaloAltoFW(pol, 1)

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Running with Docker

If your use case is to just use the CLI and you don't want to go through the process of installing capirca, you can use the dockerized version of the tool.

When using docker, mount your working directory to the /data directory of the container and pass command-line arguments in the following way.

docker run -v "${PWD}:/data" docker.pkg.github.com/google/capirca/capirca:latest
docker run -v "${PWD}:/data" docker.pkg.github.com/google/capirca/capirca:latest --helpfull
docker run -v "${PWD}:/data" docker.pkg.github.com/google/capirca/capirca:latest --config_file /data/path/to/config

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Miscellaneous

Additional documentation:

External links, resources and references:

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