Contents from e.g. RHCOS 4.19.8

etc-passwd

```
$ podman run --rm -ti docker://$(oc adm release info --image-for=rhel-coreos quay.io/openshift-release-dev/ocp-release:4.19.8-x86_64) cat /etc/passwd
root:x:0:0:Super User:/root:/bin/bash
containers:x:993:995:User for rootless containers:/nonexistent:/sbin/nologin
```

etc-sudoers

```
$ podman run --rm -ti docker://$(oc adm release info --image-for=rhel-coreos quay.io/openshift-release-dev/ocp-release:4.19.8-x86_64) cat /etc/sudoers
## Sudoers allows particular users to run various commands as
## the root user, without needing the root password.
##
## Examples are provided at the bottom of the file for collections
## of related commands, which can then be delegated out to particular
## users or groups.
##
## This file must be edited with the 'visudo' command.

## Host Aliases
## Groups of machines. You may prefer to use hostnames (perhaps using
## wildcards for entire domains) or IP addresses instead.
# Host_Alias     FILESERVERS = fs1, fs2
# Host_Alias     MAILSERVERS = smtp, smtp2

## User Aliases
## These aren't often necessary, as you can use regular groups
## (ie, from files, LDAP, NIS, etc) in this file - just use %groupname
## rather than USERALIAS
# User_Alias ADMINS = jsmith, mikem


## Command Aliases
## These are groups of related commands...

## Networking
# Cmnd_Alias NETWORKING = /sbin/route, /sbin/ifconfig, /bin/ping, /sbin/dhclient, /usr/bin/net, /sbin/iptables, /usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool

## Installation and management of software
# Cmnd_Alias SOFTWARE = /bin/rpm, /usr/bin/up2date, /usr/bin/yum

## Services
# Cmnd_Alias SERVICES = /sbin/service, /sbin/chkconfig, /usr/bin/systemctl start, /usr/bin/systemctl stop, /usr/bin/systemctl reload, /usr/bin/systemctl restart, /usr/bin/systemctl status, /usr/bin/systemctl enable, /usr/bin/systemctl disable

## Updating the locate database
# Cmnd_Alias LOCATE = /usr/bin/updatedb

## Storage
# Cmnd_Alias STORAGE = /sbin/fdisk, /sbin/sfdisk, /sbin/parted, /sbin/partprobe, /bin/mount, /bin/umount

## Delegating permissions
# Cmnd_Alias DELEGATING = /usr/sbin/visudo, /bin/chown, /bin/chmod, /bin/chgrp

## Processes
# Cmnd_Alias PROCESSES = /bin/nice, /bin/kill, /usr/bin/kill, /usr/bin/killall

## Drivers
# Cmnd_Alias DRIVERS = /sbin/modprobe

# Defaults specification

#
# Refuse to run if unable to disable echo on the tty.
#
Defaults   !visiblepw

#
# Preserving HOME has security implications since many programs
# use it when searching for configuration files. Note that HOME
# is already set when the the env_reset option is enabled, so
# this option is only effective for configurations where either
# env_reset is disabled or HOME is present in the env_keep list.
#
Defaults    always_set_home
Defaults    match_group_by_gid

# Prior to version 1.8.15, groups listed in sudoers that were not
# found in the system group database were passed to the group
# plugin, if any. Starting with 1.8.15, only groups of the form
# %:group are resolved via the group plugin by default.
# We enable always_query_group_plugin to restore old behavior.
# Disable this option for new behavior.
Defaults    always_query_group_plugin

Defaults    env_reset
Defaults    env_keep =  "COLORS DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS"
Defaults    env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE"
Defaults    env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES"
Defaults    env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE"
Defaults    env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY"

#
# Adding HOME to env_keep may enable a user to run unrestricted
# commands via sudo.
#
# Defaults   env_keep += "HOME"

Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin

## Next comes the main part: which users can run what software on
## which machines (the sudoers file can be shared between multiple
## systems).
## Syntax:
##
##      user    MACHINE=COMMANDS
##
## The COMMANDS section may have other options added to it.
##
## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL

## Allows members of the 'sys' group to run networking, software,
## service management apps and more.
# %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS

## Allows people in group wheel to run all commands
%wheel  ALL=(ALL)       ALL

## Same thing without a password
# %wheel        ALL=(ALL)       NOPASSWD: ALL

## Allows members of the users group to mount and unmount the
## cdrom as root
# %users  ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom

## Allows members of the users group to shutdown this system
# %users  localhost=/sbin/shutdown -h now

## Read drop-in files from /etc/sudoers.d (the # here does not mean a comment)
#includedir /etc/sudoers.d
```

etc-sudoers.d-coreos-sudo-group

```
$ podman run --rm -ti docker://$(oc adm release info --image-for=rhel-coreos quay.io/openshift-release-dev/ocp-release:4.19.8-x86_64) ls /etc/sudoers.d
coreos-sudo-group
$ podman run --rm -ti docker://$(oc adm release info --image-for=rhel-coreos quay.io/openshift-release-dev/ocp-release:4.19.8-x86_64) cat /etc/sudoers.d/coreos-sudo-group
# https://github.com/openshift/os/issues/96
%sudo        ALL=(ALL)       NOPASSWD: ALL
```

usr-lib-passwd

```
$ podman run --rm -ti docker://$(oc adm release info --image-for=rhel-coreos quay.io/openshift-release-dev/ocp-release:4.19.8-x86_64) cat /usr/lib/passwd
bin:x:1:1:bin:/bin:/usr/sbin/nologin
daemon:x:2:2:daemon:/sbin:/usr/sbin/nologin
adm:x:3:4:adm:/var/adm:/usr/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/usr/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/usr/sbin/nologin
operator:x:11:0:operator:/root:/usr/sbin/nologin
games:x:12:100:games:/usr/games:/usr/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/usr/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/usr/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/usr/sbin/nologin
tcpdump:x:72:72::/:/usr/sbin/nologin
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/usr/sbin/nologin
dbus:x:81:81:System Message Bus:/:/usr/sbin/nologin
nobody:x:99:99:Kernel Overflow User:/:/usr/sbin/nologin
ceph:x:167:167:Ceph daemons:/var/lib/ceph:/usr/sbin/nologin
avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/usr/sbin/nologin
systemd-journal-remote:x:794:791:Journal Remote:/var/log/journal/remote:/sbin/nologin
dnsmasq:x:795:792:Dnsmasq DHCP and DNS server:/var/lib/dnsmasq:/usr/sbin/nologin
clevis:x:796:793:Clevis Decryption Framework unprivileged user:/var/cache/clevis:/usr/sbin/nologin
gluster:x:797:794:GlusterFS daemons:/run/gluster:/sbin/nologin
systemd-coredump:x:798:796:systemd Core Dumper:/:/sbin/nologin
unbound:x:799:799:Unbound DNS resolver:/etc/unbound:/sbin/nologin
openvswitch:x:800:800::/:/sbin/nologin
chrony:x:994:992::/var/lib/chrony:/usr/sbin/nologin
sssd:x:995:993:User for sssd:/run/sssd:/usr/sbin/nologin
kube:x:996:994:Kubernetes user:/:/usr/sbin/nologin
dockerroot:x:997:986:Docker User:/var/lib/docker:/usr/sbin/nologin
etcd:x:998:997:etcd user:/var/lib/etcd:/usr/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/usr/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/usr/sbin/nologin
```