The NAVV (Network Architecture Verification and Validation) tool creates a spreadsheet for network traffic analysis from PCAP data and Zeek logs, automating Zeek analysis of PCAP files, the collation of Zeek logs and the dissection of conn.log and dns.log to create a summary or network traffic in an XLSX-formatted spreadsheet. After manually updating the spreadsheet with names and color codes for network segments (by CIDR-formatted address groups) and hosts (by IP address), running the tool again will integrate these labels and color coding into the spreadsheet to aid in conducting an evaluation of the network traffic.
The NAVV tool is a Python script requiring python3 and its pip tool. As installation of Python varies from platform to platform, please consult your operating system's documentation or the python.org Wiki to install and configure Python 3 on your system.
The recommended method for installing packages with pip is using User Installs which installs to a user-specific location rather than system-wide. Usually this is done by running pip with the --user flag. It is generally not recommended to run pip with elevated/administrator/root privileges.
Download the latest NAVV release from GitHub. Either of the .whl built distribution or the .tar.gz source archive release artifacts should suffice.
NAVV can then be installed via pip:
$ python3 -m pip install --user ~/Downloads/navv-3.0.0-py3-none-any.whl
Processing /home/user/Downloads/navv-3.0.0-py3-none-any.whl
…
Successfully installed et-xmlfile-1.1.0 lxml-4.6.3 navv-3.0.0 netaddr-0.8.0 openpyxl-3.0.7 tqdm-4.61.1Alternately, also using pip, to install the latest release from PyPI:
python3 -m pip install -U navv
NAVV can be installed via pip using git:
$ python3 -m pip install --user git+https://github.com/cisagov/network-architecture-verification-and-validation
Collecting git+https://github.com/cisagov/network-architecture-verification-and-validation
Cloning https://github.com/cisagov/network-architecture-verification-and-validation to /tmp/pip-req-build-pl6llgda
Running command git clone -q https://github.com/cisagov/network-architecture-verification-and-validation /tmp/pip-req-build-pl6llgda
Installing build dependencies ... done
…
Successfully installed et-xmlfile-1.1.0 lxml-4.6.3 navv-3.0.0 netaddr-0.8.0 openpyxl-3.0.7 tqdm-4.61.1
$ navv --help
usage: navv [-h] [-o OUTPUT_DIR] [-p PCAP] [-z ZEEK_LOGS] customer_name
…These Python libraries will be automatically downloaded and installed as runtime dependencies of the NAVV tool:
- et-xmlfile XML processing library (Home, PyPI)
- lxml XML processing library (Home, PyPI)
- netaddr network address manipulation library (Home, PyPI)
- openpyxl library for interacting with Excel 2010 xlsx/xlsm (Home, PyPI)
- tqdm progress bar decorator library (Home, PyPI)
The NAVV tool requires Zeek to be installed with the zeek and zeek-cut utilities available in the PATH. Please consult the Zeek manual for operating system-specifc instructions for installing and configuring Zeek. A NAVV Docker image can be built which bundles both Zeek and the NAVV tool together.
PyPA's build module can be used to build and package the NAVV tool. At the command line, navigate to the directory containing the NAVV source code, then:
- install the Python 3
buildmodule
$ python3 -m pip install --user --upgrade build
Collecting build
Downloading build-0.4.0-py2.py3-none-any.whl (14 kB)
…
Installing collected packages: toml, pyparsing, pep517, packaging, build
…
Successfully installed build-0.4.0 packaging-20.9 pep517-0.10.0 pyparsing-2.4.7 toml-0.10.2- build and package the NAVV tool:
$ python3 -m build
Found existing installation: setuptools 49.2.1
Uninstalling setuptools-49.2.1:
Successfully uninstalled setuptools-49.2.1
Collecting setuptools>=42
Downloading setuptools-57.0.0-py3-none-any.whl (821 kB)
|████████████████████████████████| 821 kB 1.2 MB/s
Collecting wheel
Downloading wheel-0.36.2-py2.py3-none-any.whl (35 kB)
Installing collected packages: setuptools, wheel
…
creating navv-3.0.0
…
adding 'navv/__init__.py'
adding 'navv/__main__.py'
…
adding 'navv-3.0.0.dist-info/RECORD'
removing build/bdist.linux-x86_64/wheelYou will then see the packaged NAVV artifacts (the .whl built distribution and the .tar.gz source archive files) in the dist/ directory:
$ ls -l ./dist/
total 672
-rw-r--r-- 1 build build 673878 Jun 15 22:05 navv-3.0.0-py3-none-any.whl
-rw-r--r-- 1 build build 11709 Jun 15 22:05 navv-3.0.0.tar.gzYou can then follow the same method from the Latest Release section to install the NAVV tool.
Note that the resulting packaged NAVV artifacts do not contain the external dependencies required to run the tool. Those Python libraries will be automatically downloaded during the installation of the NAVV tool. If you are packaging the NAVV tool for distribution to a host without internet access, you will need to use pip to download the external dependencies separately and install them prior to installing the NAVV tool.
$ python3 -m pip download lxml netaddr openpyxl tqdm
…
Saved ./lxml-4.6.3-cp39-cp39-manylinux2014_x86_64.whl
Saved ./netaddr-0.8.0-py2.py3-none-any.whl
Saved ./openpyxl-3.0.7-py2.py3-none-any.whl
Saved ./tqdm-4.61.1-py2.py3-none-any.whl
Saved ./et_xmlfile-1.1.0-py3-none-any.whl
Successfully downloaded lxml netaddr openpyxl tqdm et-xmlfileTransfer the downloaded .whl files and the NAVV .whl file to the offline host and install them:
$ ls -lh
total 9.4M
-rw-r--r-- 1 build build 4.6K Jun 15 22:21 et_xmlfile-1.1.0-py3-none-any.whl
-rw-r--r-- 1 build build 6.6M Jun 15 22:21 lxml-4.6.3-cp39-cp39-manylinux2014_x86_64.whl
-rw-r--r-- 1 build build 659K Jun 15 22:22 navv-3.0.0-py3-none-any.whl
-rw-r--r-- 1 build build 1.9M Jun 15 22:21 netaddr-0.8.0-py2.py3-none-any.whl
-rw-r--r-- 1 build build 238K Jun 15 22:21 openpyxl-3.0.7-py2.py3-none-any.whl
-rw-r--r-- 1 build build 75K Jun 15 22:21 tqdm-4.61.1-py2.py3-none-any.whl
$ python3 -m pip install et_xmlfile-1.1.0-py3-none-any.whl lxml-4.6.3-cp39-cp39-manylinux2014_x86_64.whl netaddr-0.8.0-py2.py3-none-any.whl openpyxl-3.0.7-py2.py3-none-any.whl tqdm-4.61.1-py2.py3-none-any.whl
…
Successfully installed et-xmlfile-1.1.0 lxml-4.6.3 netaddr-0.8.0 openpyxl-3.0.7 tqdm-4.61.1
$ python3 -m pip install navv-3.0.0-py3-none-any.whl
…
Successfully installed navv-3.0.0
$ navv --help
usage: navv [-h] [-o OUTPUT_DIR] [-p PCAP] [-z ZEEK_LOGS] customer_name
…Also, see docker/README.md for a script which can be used to build and package the NAVV tool and its dependencies.
The NAVV tool can be run with the command python3 -m navv, or simply navv if your PATH contains the installation location used by pip during installation.
Run the NAVV tool with --help to get a listing of its arguments:
$ python3 -m navv --help
usage: __main__.py [-h] [-o OUTPUT_DIR] [-p PCAP] [-z ZEEK_LOGS] customer_name
One stop shop for all your zeek-cut commands
positional arguments:
customer_name Name of the customer
optional arguments:
-h, --help show this help message and exit
-o OUTPUT_DIR, --output-dir OUTPUT_DIR
Directory to place resultant files in
-p PCAP, --pcap PCAP Path to pcap file. Will run zeek and output logs in cwd or --zeek-logs
-z ZEEK_LOGS, --zeek-logs ZEEK_LOGS
Directory containing log filesThe NAVV tool will accept as input a PCAP file, in which case it will run zeek to generate the Zeek log files containing the metadata about the network traffic; or, a directory containing Zeek logs from a previous analysis.
For example:
analyst@host tmp> ll
total 178M
drwxrwxr-x 2 analyst analyst 6 Jun 15 22:36 ACME_logs
-rw-r--r-- 1 analyst analyst 178M Jun 15 22:35 ACME.pcap
analyst@host tmp> navv -o ./ACME_logs -p ACME.pcap ACME
get_inventory_data:
Hours: 0
Minutes: 0
Seconds: 0
get_segments_data:
Hours: 0
Minutes: 0
Seconds: 0
WARNING: No Site::local_nets have been defined. It's usually a good idea to define your local networks.
Zeek returned with code: 0
run_zeek:
Hours: 0
Minutes: 0
Seconds: 4
create_analysis_array:
Hours: 0
Minutes: 0
Seconds: 0
Trimming DNS.log data:
100%|████████████████████████| 2319/2319 [00:00<00:00, 1190525.21it/s]
Performing analysis(including lookups). This may take a while:
100%|████████████████████████| 4425/4425 [00:03<00:00, 1427.59it/s]
perform_analysis:
Hours: 0
Minutes: 0
Seconds: 3
main:
Hours: 0
Minutes: 0
Seconds: 9
analyst@host tmp> ls -l ACME_logs/
total 208896
-rw-rw-r-- 1 analyst analyst 150 Jun 15 22:36 ACME_dns_data.pkl
-rw-rw-r-- 1 analyst analyst 203483 Jun 15 22:36 ACME_network_analysis.xlsxAs the example illustrates, the NAVV tool generated .pkl and .xlsx files as a result of the processing of ACME.pcap.
Adding information about network segments and/or inventory can assist in packet capture analysis. Open the NAVV-generated .xlsx file and navigate to the Segments tab. Enter the relevant network segments and choose background colors for the corresponding cells. For example:
Save your changes and re-run the NAVV tool with the -z option on the directory containing the Zeek log files and .xlsx file. The tool will modify the contents of the spreadsheet, recoloring the contents of the Analysis tab to match the segments specified in the Segments tab. This simplifies the task of identifying cross-segment traffic.
When available, the NAVV tool will use responses for queries found in Zeek's dns.log file to populate the Src_Desc and Dest_Desc fields in the Analysis tab. When DNS information is not available, it is possible to provide this information manually in the Inventory tab. Note that color formatting from the Inventory tab is applied after that from the Segments tab. Again, saving changes to the spreadsheet file and re-running the NAVV tool with the -z option will update the spreadsheet with the new inventory information and color formatting.
See docker/README.md for setup and instructions for running the NAVV tool in Docker.
NAVV is Copyright 2023 Battelle Energy Alliance, LLC, licensed under the BSD-3 Clause License.
See LICENSE for the terms of its release.
Developers, by contributing to this software project, you are agreeing to the following terms and conditions for your contributions:
- You agree your contributions are submitted under the BSD 3-Clause license.
- You represent you are authorized to make the contributions and grant the license. If your employer has rights to intellectual property that includes your contributions, you represent that you have received permission to make contributions and grant the required license on behalf of that employer.
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