* [PATCH v4] scripts/selinux: modernize mdp [not found] <0190220123354.1589-1-dominick.grift@defensec.nl> @ 2019-02-20 19:43 ` Dominick Grift 2019-02-20 20:32 ` Dominick Grift 0 siblings, 1 reply; 2+ messages in thread From: Dominick Grift @ 2019-02-20 19:43 UTC (permalink / raw) To: selinux; +Cc: Dominick Grift 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. V2: Fix existing file test for setfiles. Add a file test for checkpolicy similar to the test for setfiles for consistency. Execute setfiles with -F to ensure that customizables are relabeled as well in scenarios where filesystems are labeled but where SELinux is disabled. V3: Fixes file test that was introduced in V2. V4: Remove file tests and instead rely on which Signed-off-by: Dominick Grift <dominick.grift@defensec.nl> --- scripts/selinux/install_policy.sh | 23 +++++++++++++---------- scripts/selinux/mdp/mdp.c | 1 + 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh index 0b86c47baf7d..773377838670 100755 --- a/scripts/selinux/install_policy.sh +++ b/scripts/selinux/install_policy.sh @@ -6,25 +6,28 @@ if [ `id -u` -ne 0 ]; then fi SF=`which setfiles` if [ $? -eq 1 ]; then - if [ -f /sbin/setfiles ]; then - SF="/usr/setfiles" - else - echo "no selinux tools installed: setfiles" - exit 1 - fi + echo "no selinux tools installed: setfiles" + exit 1 fi cd mdp CP=`which checkpolicy` +if [ $? -eq 1 ]; then + echo "no selinux tools installed: checkpolicy" + exit 1 +fi VERS=`$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 @@ -55,15 +58,15 @@ else fi cd /etc/selinux/dummy/contexts/files -$SF file_contexts / +$SF -F file_contexts / mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` -$SF file_contexts $mounts +$SF -F file_contexts $mounts dodev=`cat /proc/$$/mounts | grep "/dev "` if [ "eq$dodev" != "eq" ]; then mount --move /dev /mnt - $SF file_contexts /dev + $SF -F file_contexts /dev mount --move /mnt /dev fi 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 ^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v4] scripts/selinux: modernize mdp 2019-02-20 19:43 ` [PATCH v4] scripts/selinux: modernize mdp Dominick Grift @ 2019-02-20 20:32 ` Dominick Grift 0 siblings, 0 replies; 2+ messages in thread From: Dominick Grift @ 2019-02-20 20:32 UTC (permalink / raw) To: selinux On Wed, Feb 20, 2019 at 08:43:02PM +0100, Dominick Grift wrote: > The MDP example no longer works on modern systems. I would prefer that my changes would just be addressed in Stephen's patch instead. In that case this patch can be ignored. > > 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. > > V2: > Fix existing file test for setfiles. > Add a file test for checkpolicy similar to the test for setfiles for consistency. > Execute setfiles with -F to ensure that customizables are relabeled as well in scenarios where filesystems are labeled but where SELinux is disabled. > > V3: Fixes file test that was introduced in V2. > > V4: Remove file tests and instead rely on which > > Signed-off-by: Dominick Grift <dominick.grift@defensec.nl> > --- > scripts/selinux/install_policy.sh | 23 +++++++++++++---------- > scripts/selinux/mdp/mdp.c | 1 + > 2 files changed, 14 insertions(+), 10 deletions(-) > > diff --git a/scripts/selinux/install_policy.sh b/scripts/selinux/install_policy.sh > index 0b86c47baf7d..773377838670 100755 > --- a/scripts/selinux/install_policy.sh > +++ b/scripts/selinux/install_policy.sh > @@ -6,25 +6,28 @@ if [ `id -u` -ne 0 ]; then > fi > SF=`which setfiles` > if [ $? -eq 1 ]; then > - if [ -f /sbin/setfiles ]; then > - SF="/usr/setfiles" > - else > - echo "no selinux tools installed: setfiles" > - exit 1 > - fi > + echo "no selinux tools installed: setfiles" > + exit 1 > fi > > cd mdp > > CP=`which checkpolicy` > +if [ $? -eq 1 ]; then > + echo "no selinux tools installed: checkpolicy" > + exit 1 > +fi > VERS=`$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 > @@ -55,15 +58,15 @@ else > fi > > cd /etc/selinux/dummy/contexts/files > -$SF file_contexts / > +$SF -F file_contexts / > > mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` > -$SF file_contexts $mounts > +$SF -F file_contexts $mounts > > > dodev=`cat /proc/$$/mounts | grep "/dev "` > if [ "eq$dodev" != "eq" ]; then > mount --move /dev /mnt > - $SF file_contexts /dev > + $SF -F file_contexts /dev > mount --move /mnt /dev > fi > 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 > -- Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02 https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02 Dominick Grift ^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-02-20 19:43 ` [PATCH v4] scripts/selinux: modernize mdp Dominick Grift
2019-02-20 20:32 ` Dominick Grift
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