Set the type on /etc/machine-info to net_conf_t

[ralther]

Set the type on /etc/machine-info to net_conf_t so hostnamectl can manipulate it (CRUD)

When attempting to set the PRETTY_HOSTNAME (e.g. hostnamectl --pretty hostname "My Pretty Host") you will receive these denials in the audit log:
`node=localhost type=AVC msg=audit(1713748477.775:17769): avc: denied { create } for pid=3012 comm="systemd-hostnam" name=".#machine-infocuJGLW" scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1

node=localhost type=AVC msg=audit(1713748477.775:17769): avc: denied { write } for pid=3012 comm="systemd-hostnam" path="/etc/.#machine-infocuJGLW" dev="dm-1" ino=1180584 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1

node=localhost type=PATH msg=audit(1713748477.775:17769): item=1 name="/etc/.#machine-infocuJGLW" inode=1180584 dev=fd:01 mode=0100600 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 nametype=CREATE cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0OUID="root" OGID="root"

node=localhost type=AVC msg=audit(1713748477.775:17770): avc: denied { setattr } for pid=3012 comm="systemd-hostnam" name=".#machine-infocuJGLW" dev="dm-1" ino=1180584 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1

node=localhost type=AVC msg=audit(1713748477.776:17771): avc: denied { rename } for pid=3012 comm="systemd-hostnam" name=".#machine-infocuJGLW" dev="dm-1" ino=1180584 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:etc_t:s0 tclass=file permissive=1

node=localhost type=PATH msg=audit(1713748477.776:17771): item=2 name="/etc/.#machine-infocuJGLW" inode=1180584 dev=fd:01 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 nametype=DELETE cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0OUID="root" OGID="root"

node=localhost type=PATH msg=audit(1713748477.776:17771): item=3 name="/etc/machine-info" inode=1180584 dev=fd:01 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 nametype=CREATE cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0OUID="root" OGID="root"

node=localhost type=PATH msg=audit(1713748497.093:17897): item=0 name="/etc/machine-info" inode=1180584 dev=fd:01 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 nametype=NORMAL cap_fp=0 cap_fi=0 cap_fe=0 cap_fver=0 cap_frootid=0OUID="root" OGID="root`

This is on a Rocky 9 system where the default type is etc_t. Setting the type to net_conf_t allows the command to succeed without error.

[pebenito]

In terms of the access allowed in the policy, this label change would be ok. However, I'm a little reluctant because there's only one field that's network related (pretty hostname), and that's still not used to actually configure the network hostname.

[ralther]

I understand that - it's really an informational file used by other processes. The only tool that I know directly manipulates it is hostnamectl, which calls the systemd-hostnamed service to update the file. So it's the same service that updates both the hostname and machine-info files.

I only saw this because using Cockpit to change the hostname failed. That's when I noticed /etc/hostname was type net_conf_t and /etc/machine-info was type etc_t. I checked my Fedora 39 system and those 2 files were the same type - I think they were hostname_etc_t (not sure) - but regardless, they were the same type. Same on my Rocky 9 system I have. So it seems - to me anyway - that this file was simply missed?

If there is another method to allow it to be updated, I'm open to it.

[pebenito]

Merging this as we don't have a compelling alternative at this time.