+++ This bug was initially created as a clone of Bug #2216073 +++ SELinux is preventing FRR-Zebra to access to network namespaces. sudo audit2why -i /var/log/audit/audit.log type=AVC msg=audit(1687223395.771:44136): avc: denied { read } for pid=21815 comm="zebra" name="netns" dev="tmpfs" ino=1715 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:object_r:ifconfig_var_run_t:s0 tclass=dir permissive=0 Was caused by: Missing type enforcement (TE) allow rule. You can use audit2allow to generate a loadable module to allow this access. .... sudo audit2allow -i /var/log/audit/audit.log #============= frr_t ============== allow frr_t ifconfig_var_run_t:dir { read watch }; Source Context system_u:system_r:frr_t:s0 Target Context unconfined_u:object_r:ifconfig_var_run_t:s0 frr 8.5-1.fc37 selinux-policy 37.21-2.fc37 selinux-policy-targeted 37.21-2.fc37 Reproducible: Always Steps to Reproduce: 1. Install FRR 8.5 2. Create a network namespace through ip netns add my-ns 3. Add -n switch to the zebra option at /etc/frr/daemons 4. Restart FRR 5. Login to FRR Actual Results: The VRF based on the network namespace is not available. Expected Results: vrf my-ns netns /run/netns/my-ns exit-vrf Kernel: 5.19.16-301.fc37.x86_64
With RHEL8 I see read and getattr calls: type=PROCTITLE msg=audit(06/23/2023 03:55:40.133:309) : proctitle=/usr/libexec/frr/zebra -d -F traditional -A 127.0.0.1 -s 90000000 -n type=SYSCALL msg=audit(06/23/2023 03:55:40.133:309) : arch=x86_64 syscall=inotify_add_watch success=no exit=EACCES(Permission denied) a0=0xf a1=0x5644b8faf578 a2=0x300 a3=0x3e items=0 ppid=6780 pid=6793 auid=unset uid=frr gid=frr euid=frr suid=frr fsuid=frr egid=frr sgid=frr fsgid=frr tty=(none) ses=unset comm=zebra exe=/usr/libexec/frr/zebra subj=system_u:system_r:frr_t:s0 key=(null) type=AVC msg=audit(06/23/2023 03:55:40.133:309) : avc: denied { read } for pid=6793 comm=zebra name=netns dev="tmpfs" ino=38646 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:object_r:ifconfig_var_run_t:s0 tclass=dir permissive=0 ---- type=PROCTITLE msg=audit(06/23/2023 03:55:54.574:311) : proctitle=/usr/libexec/frr/zebra -d -F traditional -A 127.0.0.1 -s 90000000 -n type=SYSCALL msg=audit(06/23/2023 03:55:54.574:311) : arch=x86_64 syscall=lstat success=no exit=EACCES(Permission denied) a0=0x7fadfa93e120 a1=0x7ffdd2f09f10 a2=0x7ffdd2f09f10 a3=0x0 items=0 ppid=1 pid=6794 auid=unset uid=frr gid=frr euid=frr suid=frr fsuid=frr egid=frr sgid=frr fsgid=frr tty=(none) ses=unset comm=zebra exe=/usr/libexec/frr/zebra subj=system_u:system_r:frr_t:s0 key=(null) type=AVC msg=audit(06/23/2023 03:55:54.574:311) : avc: denied { getattr } for pid=6794 comm=zebra path=/run/netns/my-ns dev="nsfs" ino=4026532186 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file permissive=0
Same scenario with permissive mode: type=PROCTITLE msg=audit(06/23/2023 08:11:58.380:323) : proctitle=/usr/libexec/frr/zebra -d -F traditional -A 127.0.0.1 -s 90000000 -n type=SYSCALL msg=audit(06/23/2023 08:11:58.380:323) : arch=x86_64 syscall=openat success=yes exit=15 a0=AT_FDCWD a1=0x55fa4eb1d578 a2=O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC a3=0x0 items=0 ppid=6971 pid=6984 auid=unset uid=frr gid=frr euid=frr suid=frr fsuid=frr egid=frr sgid=frr fsgid=frr tty=(none) ses=unset comm=zebra exe=/usr/libexec/frr/zebra subj=system_u:system_r:frr_t:s0 key=(null) type=AVC msg=audit(06/23/2023 08:11:58.380:323) : avc: denied { read } for pid=6984 comm=zebra name=netns dev="tmpfs" ino=38646 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:object_r:ifconfig_var_run_t:s0 tclass=dir permissive=1 ---- type=PROCTITLE msg=audit(06/23/2023 08:11:58.381:324) : proctitle=/usr/libexec/frr/zebra -d -F traditional -A 127.0.0.1 -s 90000000 -n type=SYSCALL msg=audit(06/23/2023 08:11:58.381:324) : arch=x86_64 syscall=newfstatat success=yes exit=0 a0=0xf a1=0x55fa4f6f7c13 a2=0x7ffdd2068410 a3=0x0 items=0 ppid=6971 pid=6984 auid=unset uid=frr gid=frr euid=frr suid=frr fsuid=frr egid=frr sgid=frr fsgid=frr tty=(none) ses=unset comm=zebra exe=/usr/libexec/frr/zebra subj=system_u:system_r:frr_t:s0 key=(null) type=AVC msg=audit(06/23/2023 08:11:58.381:324) : avc: denied { getattr } for pid=6984 comm=zebra path=/run/netns/my-ns dev="nsfs" ino=4026532186 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file permissive=1 ---- type=PROCTITLE msg=audit(06/23/2023 08:11:58.381:325) : proctitle=/usr/libexec/frr/zebra -d -F traditional -A 127.0.0.1 -s 90000000 -n type=SYSCALL msg=audit(06/23/2023 08:11:58.381:325) : arch=x86_64 syscall=openat success=yes exit=16 a0=AT_FDCWD a1=0x7f82ec3d7120 a2=O_RDONLY a3=0x0 items=0 ppid=6971 pid=6984 auid=unset uid=frr gid=frr euid=frr suid=frr fsuid=frr egid=frr sgid=frr fsgid=frr tty=(none) ses=unset comm=zebra exe=/usr/libexec/frr/zebra subj=system_u:system_r:frr_t:s0 key=(null) type=AVC msg=audit(06/23/2023 08:11:58.381:325) : avc: denied { open } for pid=6984 comm=zebra path=/run/netns/my-ns dev="nsfs" ino=4026532186 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file permissive=1 type=AVC msg=audit(06/23/2023 08:11:58.381:325) : avc: denied { read } for pid=6984 comm=zebra dev="nsfs" ino=4026532186 scontext=system_u:system_r:frr_t:s0 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=file permissive=1