tchughesiv/check-payload

check-payload

About

This application scans container images in an OpenShift release payload, RHEL based nodes, or an operator image for FIPS enabled binaries. The goal is to ensure binaries are compiled correctly for OpenShift.

Build

git clone https://github.com/openshift/check-payload.git
cd check-payload
make

Run

Prerequisites

• podman should be installed on the node.
• podman should be configured with pull secrets for the images to be scanned.

Configuration

The binary has a number of built-in configuration files.

A default built-in configuration (config.toml) is used if no options are specified, and no ./config.toml file is available from the current working directory when running the tool.

A specific configuration from a file can be specified using --config path/to/config.toml option. Use --config /dev/null to use an empty configuration.

An additional built-in coniguration tailored for a specific OpenShift version can be specified using -V, --config-for-version option, for example -V 4.11. When this option is specified, the settings from the additional configuration are added to (rather than override) the main configuration (see above). These additional for-version configurations are embedded into the binary during build time from the directories under dist/releases/.

Scan an OpenShift release payload

 sudo ./check-payload scan payload -V 4.11 \
   --url quay.io/openshift-release-dev/ocp-release:4.11.44-x86_64
   --output-file report.txt

Here

• -V specifies the configuration for a particular OpenShift version;
• --url specifies a payload URL;
• --output-file specifies a file to write the scan report to.

Scan a container or operator image

sudo ./check-payload scan operator \
  --spec registry.ci.openshift.org/ocp-priv/4.11-art-assembly-art6883-3-priv@sha256:138b1b9ae11b0d3b5faafacd1b469ec8c20a234b387ae33cf007441fa5c5d567

Scan a node using container image

IMAGE=some.registry.location/check-payload
podman run --privileged -ti -v /:/myroot $IMAGE scan node --root /myroot

How it works

check-payload gathers container images from OpenShift release payloads or container images. The scanner can also be used on a RHEL or RHCOS node to scan the root image. A node scan runs within a container with the host OS mounted within it.

Container Image and Payload Scans

Container Image and Payload Scans gather images and emit file paths to the validation logic. This is done by podman mounting the image to the local machine, walking the directory tree, and emitting the paths for executables to the validation engine.

Node Scans

RHEL or RHCOS nodes can be scanned with check-payload scan node. To gather the file input paths the scanner queries for all the RPMs on the system and walks the paths within the RPMs finding executables. The list of executable paths are then processed by the validation engine.

Diagram

flowchart LR
  subgraph inputs
  Image --> Scanner
  Payload --> Scanner
  Node --> Scanner
  end
  Scanner --> Validations
  Validations --> Printer
  subgraph results
  Printer
  end

Validations

The validation engine uses different logic to validate golang and non-golang executables. The scanner only scans for ELF executables.

All

All scans validate the inclusion of OpenSSL via libcrypto found in /usr/lib64 or /usr/lib. The OpenSSL library is also validated to include {FIPS_mode, fips_mode, or EVP_default_properties_is_fips_enabled}.

Regular Executables

The rules to scan regular executables are:

1. Must be dynamically linked

Most of RHEL/RHCOS executables are built dynamically to allow for dynamic linking to OpenSSL. There are exceptions for rule (1) which consists of some binaries (ldconfig, build-locale-archive, etc) which are required to be built statically, and/or do not provide cryptographic functionality.

Golang Executables

Golang validations run through a pipeline:

1. validateGoVersion - enumerates the golang version and compile details
2. validateGoCgo - ensure CGO_ENABLED=1 is set
3. validateGoCGOInit - ensure cgo_init is within the binary
4. validateGoStatic - ensure binary is dynamically linked
5. validateGoOpenssl - ensure openssl matches the dynamic library within the system
6. validateGoTags - ensure golang tags are set

Printer

The printer aggregates all the results and formats into a table, csv, markdown, etc. If any errors are found then the process exits non-zero. A successful run returns 0.