Making global modifications to users' files without alerting the user community can result in unexpected outages and unhappy users. Therefore, it is recommended that a monitoring policy be established to report user dot file permissions and determine the action to be taken in accordance with site policy. The following script will: - remove excessive permissions on dot files within interactive users' home directories - change ownership of dot files within interactive users' home directories to the user - change group ownership of dot files within interactive users' home directories to the user's primary group - listforward andrhost files to be investigated and manually deleted #!/usr/bin/env bash { a_output2=(); a_output3=() l_maxsize="1000" # Maximum number of local interactive users before warning (Default 1,000) l_valid_shells="^($( awk -F/ '$NF != "nologin" {print}' /etc/shells | sed -rn '/^//{s,/,\\/,g;p}' | paste -s -d '|' - ))$" a_user_and_home=() # Create array with local users and their home directories while read -r l_local_user l_local_user_home; do # Populate array with users and user home location [[ -n "$l_local_user" && -n "$l_local_user_home" ]] && a_user_and_home+=("$l_local_user:$l_local_user_home") done <<< "$(awk -v pat="$l_valid_shells" -F: '$(NF) ~ pat { print $1 " " $(NF-1) }' /etc/passwd)" l_asize="${#a_user_and_home[@]}" # Here if we want to look at number of users before proceeding [ "${#a_user_and_home[@]}" -gt "$l_maxsize" ] && printf '%s ' "" " ** INFO **" " - \"$l_asize\" Local interactive users found on the system" " - This may be a long running check" "" file_access_fix() { a_access_out=() l_max="$( printf '%o' $(( 0777 & ~$l_mask)) )" if [ $(( $l_mode & $l_mask )) -gt 0 ]; then printf '%s ' "" " - File: \"$l_hdfile\" is mode: \"$l_mode\" and should be mode: \"$l_max\" or more restrictive" " Updating file: \"$l_hdfile\" to be mode: \"$l_max\" or more restrictive" chmod "$l_change" "$l_hdfile" fi if [[ ! "$l_owner" =~ ($l_user) ]]; then printf '%s ' "" " - File: \"$l_hdfile\" owned by: \"$l_owner\" and should be owned by \"${l_user//|/ or }\"" " Updating file: \"$l_hdfile\" to be owned by \"${l_user//|/ or }\"" chown "$l_user" "$l_hdfile" fi if [[ ! "$l_gowner" =~ ($l_group) ]]; then printf '%s ' "" " - File: \"$l_hdfile\" group owned by: \"$l_gowner\" and should be group owned by \"${l_group//|/ or }\"" " Updating file: \"$l_hdfile\" to be group owned by \"${l_group//|/ or }\"" chgrp "$l_group" "$l_hdfile" fi } while IFS=: read -r l_user l_home; do a_dot_file=(); a_netrc=(); a_netrc_warn=(); a_bhout=(); a_hdirout=() if [ -d "$l_home" ]; then l_group="$(id -gn "$l_user" | xargs)";l_group="${l_group// /|}" while IFS= read -r -d $'0' l_hdfile; do while read -r l_mode l_owner l_gowner; do case "$(basename "$l_hdfile")" in .forward | .rhost ) a_dot_file+=(" - File: \"$l_hdfile\" exists" " Please review and manually delete this file") ;; .netrc ) l_mask='0177'; l_change="u-x,go-rwx"; file_access_fix a_netrc_warn+=(" - File: \"$l_hdfile\" exists") ;; .bash_history ) l_mask='0177'; l_change="u-x,go-rwx"; file_access_fix ;; * ) l_mask='0133'; l_change="u-x,go-wx"; file_access_fix ;; esac done < <(stat -Lc '%#a %U %G' "$l_hdfile") done < <(find "$l_home" -xdev -type f -name '.*' -print0) fi [ "${#a_dot_file[@]}" -gt 0 ] && a_output2+=(" - User: \"$l_user\" Home Directory: \"$l_home\"" "${a_dot_file[@]}") [ "${#a_netrc_warn[@]}" -gt 0 ] && a_output3+=(" - User: \"$l_user\" Home Directory: \"$l_home\"" "${a_netrc_warn[@]}") done <<< "$(printf '%s ' "${a_user_and_home[@]}")" [ "${#a_output3[@]}" -gt 0 ] && printf '%s ' "" " ** WARNING **" "${a_output3[@]}" "" [ "${#a_output2[@]}" -gt 0 ] && printf '%s ' "" "${a_output2[@]}" }

Name	Audit Name	Plugin	Category
7.2.9 Ensure local interactive user dot files access is configured	CIS Oracle Linux 9 v2.0.0 L1 Workstation	Unix	ACCESS CONTROL, MEDIA PROTECTION
7.2.9 Ensure local interactive user dot files access is configured	CIS Oracle Linux 9 v2.0.0 L1 Server	Unix	ACCESS CONTROL, MEDIA PROTECTION

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