90db06c524
In the internal function sepol_av_to_string(), use a dynamically allocated buffer for the permission names of an access vector instead of a fixed static buffer to support very long permission names. Update the internal users of sepol_av_to_string() to free the buffer. The exported function sepol_perm_to_string() is just a wrapper to the internal function. To avoid changing the behavior of this function, use a static buffer and copy the resulting string from the internal function. If the string is too long for the buffer or there was an error in creating the string, return a string indicating the error. All of the changes to the internal function and users was the work of Christian Göttsche <cgzones@googlemail.com>. Reported-by: oss-fuzz (issue 64832, 64933) Suggested-by: Christian Göttsche <cgzones@googlemail.com> Signed-off-by: James Carter <jwcart2@gmail.com> |
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|---|---|---|
| .circleci | ||
| .github/workflows | ||
| checkpolicy | ||
| dbus | ||
| gui | ||
| libselinux | ||
| libsemanage | ||
| libsepol | ||
| mcstrans | ||
| policycoreutils | ||
| python | ||
| restorecond | ||
| sandbox | ||
| scripts | ||
| secilc | ||
| semodule-utils | ||
| .gitignore | ||
| CleanSpec.mk | ||
| CONTRIBUTING.md | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
| SECURITY.md | ||
| VERSION | ||
SELinux Userspace
SELinux is a flexible Mandatory Access Control (MAC) system built into the Linux Kernel. SELinux provides administrators with a comprehensive access control mechanism that enables greater access granularity over the existing Linux Discretionary Access Controls (DAC) and is present in many major Linux distributions. This repository contains the sources for the SELinux utilities and system libraries which allow for the configuration and management of an SELinux-based system.
Please submit all bug reports and patches to the selinux@vger.kernel.org mailing list. You can subscribe by sending "subscribe selinux" in the body of an email to majordomo@vger.kernel.org. Archives of the mailing list are available at https://lore.kernel.org/selinux.
Installation
SELinux libraries and tools are packaged in several Linux distributions:
- Alpine Linux (https://pkgs.alpinelinux.org/package/edge/testing/x86/policycoreutils)
- Arch Linux User Repository (https://aur.archlinux.org/packages/policycoreutils/)
- Buildroot (https://git.buildroot.net/buildroot/tree/package/policycoreutils)
- Debian and Ubuntu (https://packages.debian.org/sid/policycoreutils)
- Gentoo (https://packages.gentoo.org/packages/sys-apps/policycoreutils)
- RHEL and Fedora (https://src.fedoraproject.org/rpms/policycoreutils)
- Yocto Project (http://git.yoctoproject.org/cgit/cgit.cgi/meta-selinux/tree/recipes-security/selinux)
- and many more (https://repology.org/project/policycoreutils/versions)
Building and testing
Build dependencies on Fedora:
# For C libraries and programs
dnf install \
audit-libs-devel \
bison \
bzip2-devel \
CUnit-devel \
diffutils \
flex \
gcc \
gettext \
glib2-devel \
make \
libcap-devel \
libcap-ng-devel \
pam-devel \
pcre2-devel \
xmlto
# For Python and Ruby bindings
dnf install \
python3-devel \
python3-pip \
python3-setuptools \
python3-wheel \
ruby-devel \
swig
Build dependencies on Debian:
# For C libraries and programs
apt-get install --no-install-recommends --no-install-suggests \
bison \
flex \
gawk \
gcc \
gettext \
make \
libaudit-dev \
libbz2-dev \
libcap-dev \
libcap-ng-dev \
libcunit1-dev \
libglib2.0-dev \
libpcre2-dev \
pkgconf \
python3 \
systemd \
xmlto
# For Python and Ruby bindings
apt-get install --no-install-recommends --no-install-suggests \
python3-dev \
python3-pip \
python3-setuptools \
python3-wheel \
ruby-dev \
swig
To build and install everything under a private directory, run:
make clean distclean
make DESTDIR=~/obj install install-rubywrap install-pywrap
On Debian the environment variable DEB_PYTHON_INSTALL_LAYOUT needs to be set
to deb when installing the Python wrappers in order to create the correct
Python directory structure.
On Debian systems older than bookworm set
PYTHON_SETUP_ARGS='--install-option "--install-layout=deb"' instead.
To run tests with the built libraries and programs, several paths (relative to $DESTDIR) need to be added to variables $LD_LIBRARY_PATH, $PATH and $PYTHONPATH.
This can be done using ./scripts/env_use_destdir:
DESTDIR=~/obj ./scripts/env_use_destdir make test
Some tests require the reference policy to be installed (for example in python/sepolgen).
To install as the default system libraries and binaries (overwriting any previously installed ones - dangerous!), on x86_64, run:
make LIBDIR=/usr/lib64 SHLIBDIR=/lib64 install install-pywrap relabel
or on x86 (32-bit), run:
make install install-pywrap relabel
This may render your system unusable if the upstream SELinux userspace lacks library functions or other dependencies relied upon by your distribution. If it breaks, you get to keep both pieces.
Setting CFLAGS
Setting CFLAGS during the make process will cause the omission of many defaults. While the project strives to provide a reasonable set of default flags, custom CFLAGS could break the build, or have other undesired changes on the build output. Thus, be very careful when setting CFLAGS. CFLAGS that are encouraged to be set when overriding are:
- -fno-semantic-interposition for gcc or compilers that do not do this. clang does this by default. clang-10 and up will support passing this flag, but ignore it. Previous clang versions fail.
macOS
To install libsepol on macOS (mainly for policy analysis):
cd libsepol; make PREFIX=/usr/local install
This requires GNU coreutils:
brew install coreutils