Thanks for your suggestion, but this FIFO is for passing messages back to a program running in my desktop session to display notifications via dbus. My user program would not be able to access anything in /var/run nut. Also, it does not appear that the existing policy allows nut_upsmon_t to write to a nut_var_run_t:fifo_file.
# ls -ld /var/run nut
drwxrwx---. 2 root dialout 140 2023-06-02 22:48:02 /var/run/nut
# sesearch -A -s nut_upsmon_t -p write | grep fifo_file
allow daemon crond_t:fifo_file { append getattr ioctl lock read write };
allow daemon initrc_domain:fifo_file { append getattr ioctl lock read write };
allow daemon initrc_transition_domain:fifo_file { append getattr ioctl lock read write };
allow domain abrt_t:fifo_file { append getattr ioctl lock read write };
allow domain crond_t:fifo_file { append getattr ioctl lock read write };
allow domain rpm_script_tmp_t:fifo_file { append getattr ioctl lock read write };
allow domain rpm_transition_domain:fifo_file { append getattr ioctl lock read write };
allow domain sshd_t:fifo_file { append getattr ioctl lock read write };
allow domain system_cronjob_t:fifo_file { append getattr ioctl lock read write };
allow domain var_run_t:fifo_file write;
allow nut_upsmon_t initctl_t:fifo_file { append getattr ioctl lock open read write };
allow nut_upsmon_t nut_upsmon_t:fifo_file { append create getattr ioctl link lock open read rename setattr unlink write }; [ fips_mode ]:True
allow nut_upsmon_t nut_upsmon_t:fifo_file { append getattr ioctl lock open read write };
allow nut_upsmon_t systemd_passwd_var_run_t:fifo_file { append create getattr ioctl link lock open read rename setattr unlink write };
But, I have found a solution in that sesearch output. Running "chcon -t initctl_t .alertFIFO" allows the nut_upsmon_t process to use the FIFO, and my unconfined user process can read from it.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
On 6/9/23 11:03, Trevor Hemsley wrote:
Hi
You appear to be running an el8 (clone) and on my Rocky Linux 8 system I ran
[root@rhel8 ~]# semanage fcontext -l | grep nut_
/etc/ups(/.*)? all files system_u:object_r:nut_conf_t:s0
/sbin/upsdrvctl regular file system_u:object_r:nut_upsdrvctl_exec_t:s0
/usr/lib/systemd/system/nut.* regular file system_u:object_r:nut_unit_file_t:s0
/usr/sbin/blazer_usb regular file system_u:object_r:nut_upsdrvctl_exec_t:s0
/usr/sbin/upsd regular file system_u:object_r:nut_upsd_exec_t:s0
/usr/sbin/upsdrvctl regular file system_u:object_r:nut_upsdrvctl_exec_t:s0
/usr/sbin/upsmon regular file system_u:object_r:nut_upsmon_exec_t:s0
/var/run/nut(/.*)? all files system_u:object_r:nut_var_run_t:s0
I am wondering if your problem would just go away if you moved your FIFO under /var/run/nut where it would automatically be assigned nut_var_run_t
Or not! :-)
Trevor
On 08/06/2023 20:03, Robert Nichols wrote:
SELinux is not allowing me to set the needed context on a FIFO that will be written by a nut_upsmon_t process. Runnin sesearch to find suitable types yields:
allow nut_upsmon_t nut_upsmon_t:fifo_file { append getattr ioctl lock open read write };
But, when I try to run "chcon -t nut_upsmon_t /path/to/fifo" I get "permission denied" and an SELinux alert than complains
If you want to change the label of .alertFIFO2 to nut_upsmon_t, you are not allowed to since it is not a valid file type.
Then you must pick a valid file label.
Do
select a valid file type. List valid file labels by executing:
# seinfo -afile_type -x
That returns info for files, not FIFOs.
Once again, SELinux is causing me more problems than any virus would.
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