Merge pull request #2169 from jan-cerny/oscap_bootc_tool

Introduce oscap-bootc

CMakeLists.txt

@@ -337,6 +337,7 @@ cmake_dependent_option(ENABLE_OSCAP_UTIL_AS_RPM "enable the scap-as-rpm utility,
 cmake_dependent_option(ENABLE_OSCAP_UTIL_SSH "enables the oscap-ssh utility, this lets you scan remote machines over ssh" ON "NOT WIN32" OFF)
 cmake_dependent_option(ENABLE_OSCAP_UTIL_VM "enables the oscap-vm utility, this lets you scan VMs and VM storage images" ON "NOT WIN32" OFF)
 cmake_dependent_option(ENABLE_OSCAP_UTIL_PODMAN "enables the oscap-podman utility, this lets you scan Podman containers and container images" ON "NOT WIN32" OFF)
+cmake_dependent_option(ENABLE_OSCAP_UTIL_BOOTC "enables the oscap-bootc utility, this lets you build hardened bootable container images" ON "NOT WIN32" OFF)
 cmake_dependent_option(ENABLE_OSCAP_UTIL_CHROOT "enables the oscap-chroot utility, this lets you scan entire chroots using offline scanning" ON "NOT WIN32" OFF)
 option(ENABLE_OSCAP_UTIL_AUTOTAILOR "enables the autotailor utility that is able to perform command-line tailoring" TRUE)
 option(ENABLE_OSCAP_REMEDIATE_SERVICE "enables the oscap-remediate service" FALSE)
@@ -476,6 +477,7 @@ message(STATUS "scap-as-rpm: ${ENABLE_OSCAP_UTIL_AS_RPM}")
 message(STATUS "oscap-ssh: ${ENABLE_OSCAP_UTIL_SSH}")
 message(STATUS "oscap-vm: ${ENABLE_OSCAP_UTIL_VM}")
 message(STATUS "oscap-podman: ${ENABLE_OSCAP_UTIL_PODMAN}")
+message(STATUS "oscap-bootc: ${ENABLE_OSCAP_UTIL_BOOTC}")
 message(STATUS "oscap-chroot: ${ENABLE_OSCAP_UTIL_CHROOT}")
 message(STATUS "autotailor: ${ENABLE_OSCAP_UTIL_AUTOTAILOR}")
 message(STATUS " ")

docs/manual/manual.adoc

@@ -2143,6 +2143,43 @@ registry.access.redhat.com/ubi8  latest  3269c37eae33  2 months ago  208 MB
 
 Note that the `oscap-podman` command requires root privileges.
 
+=== Building hardened bootable container images using oscap-bootc
+
+The `oscap-bootc` tool is a convenience script that makes building hardened bootable container images easier.
+This tool is designed to be used during the build of the bootable container image.
+
+Include `oscap-bootc` in your `Containerfile` that will be used to build your bootable container image.
+The `Containerfile` first needs to install the `openscap-utils` package which ships the `oscap-bootc` tool.
+
+Also, SCAP content needs to be installed to the image before `oscap-bootc` will be run.
+Although any SCAP content can be consumed by the tool, the SCAP source data streams shipped in `scap-security-guide` are specially cared to be compatible with bootable containers.
+
+Example `Containerfile`:
+
+----
+FROM quay.io/centos-bootc/centos-bootc:stream9
+
+RUN dnf install -y openscap-utils scap-security-guide
+
+RUN oscap-bootc --profile stig /usr/share/xml/scap/ssg/content/ssg-cs9-ds.xml
+----
+
+Once you have your `Containerfile`, execute the image build:
+
+----
+podman build -t hardened_image .
+----
+
+The `oscap-bootc` tool installs and removes all packages required by the selected profile to or from the image.
+Then, it runs a scan and remediation with the selected profile.
+It doesn't use offline scanning.
+The configuration files and other content in the image are modified by this process, depending on the used SCAP content.
+
+The built bootable container image can be then deployed and booted.
+After booting the image, the state of the resulting system will be in line with the selected security profile.
+
+The `oscap-bootc` tool can't be used anywhere else than in a `Containerfile`.
+
 === Scanning of Docker containers and images using oscap-docker
 
 The `oscap-docker` is used to scan Docker containers and images. It can

openscap.spec

@@ -92,6 +92,7 @@ Summary:        OpenSCAP Utilities
 Requires:       %{name}%{?_isa} = %{epoch}:%{version}-%{release}
 Requires:       rpmdevtools rpm-build
 Requires:       %{name}-scanner%{?_isa} = %{epoch}:%{version}-%{release}
+Requires:       %{name}-engine-sce%{?_isa} = %{epoch}:%{version}-%{release}
 
 %description    utils
 The %{name}-utils package contains command-line tools build on top

utils/CMakeLists.txt

@@ -139,6 +139,14 @@ if(ENABLE_OSCAP_UTIL_PODMAN)
 		DESTINATION "${CMAKE_INSTALL_MANDIR}/man8"
 	)
 endif()
+if(ENABLE_OSCAP_UTIL_BOOTC)
+	install(PROGRAMS "oscap-bootc"
+		DESTINATION ${CMAKE_INSTALL_BINDIR}
+	)
+	install(FILES "oscap-bootc.8"
+		DESTINATION "${CMAKE_INSTALL_MANDIR}/man8"
+	)
+endif()
 if(ENABLE_OSCAP_UTIL_AS_RPM)
 	install(PROGRAMS "scap-as-rpm"
 		DESTINATION ${CMAKE_INSTALL_BINDIR}

utils/oscap-bootc

@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+
+# Copyright 2024 Red Hat Inc., Durham, North Carolina.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+import argparse
+import subprocess
+import sys
+import tempfile
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description="Use in your Containerfile to build hardened bootable "
+        "container images. Performs OpenSCAP scan and remediation of the "
+        "image.")
+    parser.add_argument(
+        "--profile",
+        help="ID of the profile to be evaluated")
+    parser.add_argument(
+        "--tailoring-file",
+        help="Use given XCCDF Tailoring file")
+    parser.add_argument(
+        "--tailoring-id", metavar="COMPONENT_ID",
+        help="Use given DS component as XCCDF Tailoring file")
+    parser.add_argument(
+        "--results-arf",
+        help="Write ARF (result data stream) into file")
+    parser.add_argument(
+        "--report",
+        help="Write HTML report into file")
+    parser.add_argument(
+        "data_stream", metavar="DATA_STREAM",
+        help="Path to a SCAP source data stream, eg. "
+        "/usr/share/xml/scap/ssg/content/ssg-rhel10-ds.xml")
+    # Unfortunately, we can't add "--rule", "--skip-rule", or "--reference"
+    # because the "oscap xccdf generate fix" submodule doesn't support these
+    # options.
+    return parser.parse_args()
+
+
+def ensure_sce_installed():
+    query_cmd = ["rpm", "-q", "openscap-engine-sce"]
+    query_process = subprocess.run(query_cmd, capture_output=True)
+    if query_process.returncode != 0:
+        raise RuntimeError(
+            "The script requires to have the openscap-engine-sce package "
+            "installed.")
+
+
+def add_args(option_args_list, cmd):
+    for o, a in option_args_list:
+        if a:
+            cmd.append(o)
+            cmd.append(a)
+
+
+def add_common_args(args, cmd):
+    oal = [
+        ("--profile", args.profile),
+        ("--tailoring-file", args.tailoring_file),
+        ("--tailoring-id", args.tailoring_id)
+    ]
+    add_args(oal, cmd)
+
+
+def add_eval_args(args, cmd):
+    oal = [
+        ("--results-arf", args.results_arf),
+        ("--report", args.report),
+    ]
+    add_args(oal, cmd)
+
+
+def pre_scan_fix(args):
+    with tempfile.NamedTemporaryFile(delete=False) as remediation_script:
+        gen_fix_cmd = [
+            "oscap", "xccdf", "generate", "fix", "--fix-type", "bootc",
+            "--output", remediation_script.name]
+        add_common_args(args, gen_fix_cmd)
+        gen_fix_cmd.append(args.data_stream)
+        subprocess.run(gen_fix_cmd, check=True)
+        subprocess.run(["bash", remediation_script.name], check=True)
+
+
+def scan_and_remediate(args):
+    oscap_cmd = ["oscap", "xccdf", "eval", "--progress", "--remediate"]
+    add_common_args(args, oscap_cmd)
+    add_eval_args(args, oscap_cmd)
+    oscap_cmd.append(args.data_stream)
+    env = {"OSCAP_PREFERRED_ENGINE": "SCE", "OSCAP_BOOTC_BUILD": "YES"}
+    try:
+        subprocess.run(oscap_cmd, env=env, check=True)
+    except subprocess.CalledProcessError as e:
+        if e.returncode not in [0, 2]:
+            print(e, file=sys.stderr)
+
+
+def main():
+    args = parse_args()
+    ensure_sce_installed()
+    pre_scan_fix(args)
+    scan_and_remediate(args)
+
+
+if __name__ == "__main__":
+    main()

utils/oscap-bootc.8

@@ -0,0 +1,54 @@
+.TH oscap-bootc "8" "November 2024" "Red Hat, Inc." "System Administration Utilities"
+
+.SH NAME
+oscap-bootc \- Tool for building hardened bootable container images
+
+.SH DESCRIPTION
+The oscap-bootc tool is a convenience script that makes building hardened bootable container images easier.
+This tool is designed to be used during the build of the bootable container image.
+Include oscap-bootc in your Containerfile that will be used to build your bootable container image.
+The oscap-bootc runs oscap tool on a given container image.
+
+The oscap-bootc tool can't be used anywhere else than in a Containerfile.
+
+.SH USAGE
+
+oscap-bootc [OPTION...] DATASTREAM_FILE
+
+Usage of the tool mimics usage and options of oscap(8) tool.
+
+.SH OPTIONS
+.TP
+\fB\-\-profile PROFILE_ID\fR
+.RS
+ID of the profile to be evaluated.
+.RE
+.TP
+\fB\-\-tailoring-file TAILORING_FILE\fR
+.RS
+Use given file for XCCDF tailoring. Select profile from tailoring file to apply using --profile. If both --tailoring-file and --tailoring-id are specified, --tailoring-file takes priority.
+.RE
+.TP
+\fB\-\-tailoring-id COMPONENT_REF_ID\fR
+.RS
+Use tailoring component in input source data stream for XCCDF tailoring. The tailoring component must be specified by its Ref-ID (value of component-ref/@id attribute in input source data stream). Select profile from tailoring component to apply using --profile. If both --tailoring-file and --tailoring-id are specified, --tailoring-file takes priority.
+.RE
+.TP
+\fB\-\-results-arf FILE\fR
+.RS
+Writes results to a given FILE in Asset Reporting Format.
+.RE
+.TP
+\fB\-\-report FILE\fR
+.RS
+Write HTML report into FILE.
+.RE
+
+.SH REPORTING BUGS
+.nf
+Please report bugs using https://github.com/OpenSCAP/openscap/issues
+
+.SH AUTHORS
+.nf
+Jan Černý <[email protected]>
+.fi