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niderecha
n00b
Joined: 10 Nov 2024
Posts: 17
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 Posted: Sun Nov 10, 2024 11:31 pm Post subject: help with selinux on a fresh gentoo |
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Hi. I'm new to selinux, and I'm trying to make it work (enforcing, strict) on an empty and fresh gentoo with profile
| Code: | | [34] default/linux/amd64/23.0/no-multilib/hardened/selinux/systemd (stable) * |
and a minimal set of utilities. There are a few problems I don't understand, it starts with NetworkManager:
| Code: | Nov 10 23:14:26 gentoo systemd[1]: Starting Network Manager...
Nov 10 23:14:26 gentoo kernel: audit: type=1400 audit(1731280466.619:200): avc: denied { search } for pid=1249 comm="(kManager)" name="pressure" dev="proc" ino=4026532062 scontext=system_u:system_r:init_t tcontext=system_u:object_r:proc_psi_t tclass=dir permissive=0
Nov 10 23:14:26 gentoo NetworkManager[1249]: <info> [1731280466.6466] NetworkManager (version 1.46.0-r1) is starting... (after a restart, boot:b5e02538-4d3f-4629-b718-22043a4494f5)
Nov 10 23:14:26 gentoo NetworkManager[1249]: <info> [1731280466.6466] Read config: /etc/NetworkManager/NetworkManager.conf (lib: 31-mac-addr-change.conf)
Nov 10 23:14:26 gentoo NetworkManager[1249]: <info> [1731280466.6488] manager[0x55dd42195770]: monitoring kernel firmware directory '/lib/firmware'.
Nov 10 23:14:26 gentoo NetworkManager[1249]: <error> [1731280466.6488] session-monitor: failed to create systemd-logind monitor: -13
Nov 10 23:14:26 gentoo dbus-daemon[885]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.32' (uid=0 pid=1249 comm="/usr/sbin/NetworkManager --no-daemon" label="system_u:system_r:NetworkManager_t")
Nov 10 23:14:26 gentoo systemd[1]: Starting Hostname Service...
Nov 10 23:14:26 gentoo kernel: audit: type=1400 audit(1731280466.643:201): avc: denied { watch } for pid=1249 comm="NetworkManager" path="/run/systemd/seats" dev="tmpfs" ino=86 scontext=system_u:system_r:NetworkManager_t tcontext=system_u:object_r:systemd_sessions_runtime_t tclass=dir permissive=0
Nov 10 23:14:26 gentoo kernel: audit: type=1400 audit(1731280466.673:202): avc: denied { search } for pid=1255 comm="(ostnamed)" name="pressure" dev="proc" ino=4026532062 scontext=system_u:system_r:init_t tcontext=system_u:object_r:proc_psi_t tclass=dir permissive=0
Nov 10 23:14:26 gentoo (ostnamed)[1255]: systemd-hostnamed.service: Failed to set up mount namespacing: /proc: Permission denied
Nov 10 23:14:26 gentoo (ostnamed)[1255]: systemd-hostnamed.service: Failed at step NAMESPACE spawning /usr/lib/systemd/systemd-hostnamed: Permission denied
Nov 10 23:14:26 gentoo kernel: audit: type=1400 audit(1731280466.689:203): avc: denied { mounton } for pid=1255 comm="(ostnamed)" path="/run/systemd/mount-rootfs/proc" dev="zfs" ino=881 scontext=system_u:system_r:init_t tcontext=system_u:object_r:unlabeled_t tclass=dir permissive=0 |
What is the right thing to do about the very first error?
| Code: | | Nov 10 23:14:26 gentoo kernel: audit: type=1400 audit(1731280466.619:200): avc: denied { search } for pid=1249 comm="(kManager)" name="pressure" dev="proc" ino=4026532062 scontext=system_u:system_r:init_t tcontext=system_u:object_r:proc_psi_t tclass=dir permissive=0 |
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nicop
Tux's lil' helper
Joined: 10 Apr 2014
Posts: 93
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niderecha
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Joined: 10 Nov 2024
Posts: 17
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| Posted: Mon Nov 11, 2024 9:09 am Post subject: |
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Thanks. I've been following the wiki, but I still have to wrap my head around it.
This is not a desktop, it should be a server running a web server, php, database and not much else. I'm a bit confused because from the first error it looks like I need to give init_t more power, and this is messing with the base system which should already have sane defaults... |
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nicop
Tux's lil' helper
Joined: 10 Apr 2014
Posts: 93
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| Posted: Mon Nov 11, 2024 10:50 pm Post subject: |
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| niderecha wrote: | | the base system which should already have sane defaults... |
Sane defaults policies may have different meanings depending on the environments. So you'll have to set custom policies.
About your log :
- Some warnings do not necessarily block a program. search permission may in some cases be one of them.
Besides network-manager with its multiple hooks, may not be the best way to prevent warnings.
- You have a AVC message with unlabeled_t. SELinux is based on file label, so you have to clean up that before. I think something was wrong during your installation. Try to relabel : https://wiki.gentoo.org/wiki/SELinux/Installation#Relabel |
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niderecha
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Joined: 10 Nov 2024
Posts: 17
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| Posted: Thu Nov 14, 2024 8:32 pm Post subject: |
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Thanks! I relabeled the system (although I thought I have done it before) and replaced networkmanager with systemd-networkd, hopefully it is simpler.
The first error messages are:
| Code: | Nov 14 19:55:29 gentoo kernel: audit: type=1400 audit(1731614129.280:3): avc: denied { setattr } for pid=1 comm="systemd" name="chr" dev="tmpfs" ino=11 scontext=system_u:system_r:init_t tcontext=system_u:object_r:init_runtime_t tclass=chr_file permissive=1
Nov 14 19:55:29 gentoo kernel: audit: type=1400 audit(1731614129.280:4): avc: denied { setattr } for pid=1 comm="systemd" name="blk" dev="tmpfs" ino=12 scontext=system_u:system_r:init_t tcontext=system_u:object_r:init_runtime_t tclass=blk_file permissive=1 |
Does it mean I'm doing something wrong? |
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nicop
Tux's lil' helper
Joined: 10 Apr 2014
Posts: 93
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| Posted: Fri Nov 15, 2024 9:46 am Post subject: |
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I suspect systemd try relabeling /run or /tmp, wich is ok.
Could you post your fstab ? |
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niderecha
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Joined: 10 Nov 2024
Posts: 17
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| Posted: Fri Nov 15, 2024 9:49 am Post subject: |
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My fstab is just one line: | Code: | | /dev/vda1 /boot vfat defaults,discard,umask=0077 0 2 |
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nicop
Tux's lil' helper
Joined: 10 Apr 2014
Posts: 93
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| Posted: Fri Nov 15, 2024 9:55 am Post subject: |
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No root, tmpfs ? 
Could you post full /etc/fstab ? |
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niderecha
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Joined: 10 Nov 2024
Posts: 17
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| Posted: Fri Nov 15, 2024 9:58 am Post subject: |
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Root is taken care of by init, and I don't mount anything else. This is a minimal test system in qemu, I plan adding things when I understand what selinux really does and when I get it to work with selinux 
| Code: | gentoo ~ # cat /etc/fstab
# /etc/fstab: static file system information.
#
# See the manpage fstab(5) for more information.
#
# NOTE: The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# NOTE: Even though we list ext4 as the type here, it will work with ext2/ext3
# filesystems. This just tells the kernel to use the ext4 driver.
#
# NOTE: You can use full paths to devices like /dev/sda3, but it is often
# more reliable to use filesystem labels or UUIDs. See your filesystem
# documentation for details on setting a label. To obtain the UUID, use
# the blkid(8) command.
# <fs> <mountpoint> <type> <opts> <dump> <pass>
#LABEL=boot /boot ext4 defaults 1 2
#UUID=58e72203-57d1-4497-81ad-97655bd56494 / xfs defaults 0 1
#LABEL=swap none swap sw 0 0
#/dev/cdrom /mnt/cdrom auto noauto,ro 0 0
/dev/vda1 /boot vfat defaults,discard,umask=0077 0 2
gentoo ~ # |
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nicop
Tux's lil' helper
Joined: 10 Apr 2014
Posts: 93
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| Posted: Fri Nov 15, 2024 10:30 am Post subject: |
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ah QEMU, ok.
output of mount ? |
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niderecha
n00b
Joined: 10 Nov 2024
Posts: 17
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| Posted: Fri Nov 15, 2024 10:31 am Post subject: |
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here:
| Code: | gentoo ~ # mount
rpool/gentoo on / type zfs (rw,relatime,seclabel,xattr,posixacl,casesensitive)
devtmpfs on /dev type devtmpfs (rw,nosuid,seclabel,size=4096k,nr_inodes=4099331,mode=755,inode64)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,seclabel,size=16419128k,nr_inodes=4104782,inode64)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,seclabel,gid=5,mode=620,ptmxmode=000)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime,seclabel)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
cgroup2 on /sys/fs/cgroup type cgroup2 (rw,nosuid,nodev,noexec,relatime,seclabel,nsdelegate,memory_recursiveprot)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime,seclabel)
efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,seclabel,size=6567652k,nr_inodes=819200,mode=755,inode64)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,nosuid,noexec,relatime)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=32,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=2482)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime,seclabel)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime,seclabel)
tracefs on /sys/kernel/tracing type tracefs (rw,nosuid,nodev,noexec,relatime,seclabel)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,nosuid,nodev,relatime,seclabel,pagesize=2M)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,seclabel,size=16419128k,nr_inodes=1048576,inode64)
tmpfs on /run/credentials/systemd-journald.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-network-generator.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-udev-load-credentials.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run/credentials/systemd-tmpfiles-setup-dev-early.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-sysctl.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-tmpfiles-setup-dev.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-networkd.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/systemd-vconsole-setup.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
/dev/vda1 on /boot type vfat (rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,errors=remount-ro,discard)
tmpfs on /run/credentials/systemd-tmpfiles-setup.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/credentials/getty@tty1.service type tmpfs (ro,nosuid,nodev,noexec,relatime,nosymfollow,seclabel,size=1024k,nr_inodes=1024,mode=700,inode64,noswap)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,seclabel,size=3283824k,nr_inodes=820956,mode=700,inode64) |
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