On Wed, Feb 20, 2019 at 01:33:54PM +0100, Dominick Grift wrote:
> The MDP example no longer works on modern systems.
>
> Add support for devtmpfs. This is required by login programs to relabel terminals.
> Compile the policy with deny_unknown allow status to anticipate user space object managers in core components such as systemd.
> Add default seusers mapping and failsafe context for the SELinux PAM module.
There are a couple more possible improvements that i have identified:
Fail gracefully if checkpolicy does not exist
Run setfiles with -F. There *might* be one scenario where this might be a good idea. Where the filesystem is labeled with invalid contexts but where SELinux is disabled.
In that case setfiles will reset, but only types (I suppose)
>
> Signed-off-by: Dominick Grift <dominick.grift@xxxxxxxxxxx>
> ---
> scripts/selinux/install_policy.sh | 6 +++++-
> scripts/selinux/mdp/mdp.c | 1 +
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh
> index 0b86c47baf7d..334fcf8903d5 100755
> --- a/scripts/selinux/install_policy.sh
> +++ b/scripts/selinux/install_policy.sh
> @@ -20,14 +20,18 @@ CP=`which checkpolicy`
> VERS=`$CP -V | awk '{print $1}'`
>
> ./mdp policy.conf file_contexts
> -$CP -o policy.$VERS policy.conf
> +$CP -U allow -o policy.$VERS policy.conf
>
> mkdir -p /etc/selinux/dummy/policy
> mkdir -p /etc/selinux/dummy/contexts/files
>
> +echo "__default__:user_u" > /etc/selinux/dummy/seusers
> +echo "base_r:base_t" > /etc/selinux/dummy/contexts/failsafe_context
> +
> cp file_contexts /etc/selinux/dummy/contexts/files
> cp dbus_contexts /etc/selinux/dummy/contexts
> cp policy.$VERS /etc/selinux/dummy/policy
> +
> FC_FILE=/etc/selinux/dummy/contexts/files/file_contexts
>
> if [ ! -d /etc/selinux ]; then
> diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c
> index 073fe7537f6c..cf06d5694cbc 100644
> --- a/scripts/selinux/mdp/mdp.c
> +++ b/scripts/selinux/mdp/mdp.c
> @@ -131,6 +131,7 @@ int main(int argc, char *argv[])
>
> fprintf(fout, "fs_use_trans mqueue user_u:base_r:base_t;\n");
> fprintf(fout, "fs_use_trans devpts user_u:base_r:base_t;\n");
> + fprintf(fout, "fs_use_trans devtmpfs user_u:base_r:base_t;\n");
> fprintf(fout, "fs_use_trans hugetlbfs user_u:base_r:base_t;\n");
> fprintf(fout, "fs_use_trans tmpfs user_u:base_r:base_t;\n");
> fprintf(fout, "fs_use_trans shm user_u:base_r:base_t;\n");
> --
> 2.21.0.rc1
>
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Dominick Grift
