#!/usr/bin/env bash
# policy: usr_ctl_netman — grant specific IPA users the ability to modify this
# device's NON-WI-FI NetworkManager connections (IP address, gateway, DNS,
# routes, etc.) — NOT a blanket sudo/root grant, and deliberately NOT extended
# to Wi-Fi connections (see usr_ctl_wifi for that, kept separate on purpose).
#
# Mechanism: NetworkManager already lets a connection's designated non-root
# "permitted user" modify/activate THAT connection without a password
# (org.freedesktop.NetworkManager.settings.modify.own — allowed for local
# users by default on every mainstream distro's polkit rules). This policy
# adds the member to the `connection.permissions` list of every EXISTING
# non-Wi-Fi connection; Wi-Fi connections are left completely untouched, so
# a member can repoint the wired IP/gateway but cannot touch Wi-Fi settings.
#
# Requires: NetworkManager (nmcli) on the client.
# Note: applies to connections that exist at enforcement time; a brand-new
# wired connection created afterwards is picked up on the next 30-min tick.
# Users can already create/manage their OWN new connections by default
# (standard NetworkManager multi-user behavior) — this policy is specifically
# about granting access to EXISTING, previously root-owned connections.

NETMAN_STATE="$STATE_DIR/netman-acl-users"
[[ -f "$NETMAN_STATE" ]] || touch "$NETMAN_STATE"

if ! command -v nmcli &>/dev/null; then
    warn "usr_ctl_netman: nmcli not found (NetworkManager not installed) — skipping"
else
    _netman_grp_exists=false
    grep -qxF "usr_ctl_netman" <<< "$_ALL_USER_GROUPS" && _netman_grp_exists=true

    _NETMAN_USERS=()
    if [[ "$_netman_grp_exists" == true ]]; then
        while IFS= read -r _u; do
            [[ -z "$_u" ]] && continue
            _NETMAN_USERS+=("$_u")
        done < <(_ipa_group_member_users usr_ctl_netman)
    fi

    _netman_in_desired() {
        local n="$1"
        for _d in "${_NETMAN_USERS[@]+"${_NETMAN_USERS[@]}"}"; do [[ "$_d" == "$n" ]] && return 0; done
        return 1
    }

    # Every current non-Wi-Fi connection UUID (ethernet, bridge, bond, vlan, ...).
    _NON_WIFI_UUIDS=()
    while IFS=: read -r _type _uuid; do
        [[ -z "$_uuid" ]] && continue
        [[ "$_type" == "wifi" || "$_type" == "802-11-wireless" ]] && continue
        _NON_WIFI_UUIDS+=("$_uuid")
    done < <(nmcli -t -f TYPE,UUID connection show 2>/dev/null)

    # Grant: add each desired user to every non-Wi-Fi connection's permissions.
    for _u in "${_NETMAN_USERS[@]+"${_NETMAN_USERS[@]}"}"; do
        getent passwd "$_u" &>/dev/null || continue
        for _uuid in "${_NON_WIFI_UUIDS[@]+"${_NON_WIFI_UUIDS[@]}"}"; do
            _perms=$(nmcli -t -g connection.permissions connection show "$_uuid" 2>/dev/null)
            if [[ "$_perms" != *"user:${_u}:"* ]]; then
                nmcli connection modify "$_uuid" +connection.permissions "user:${_u}:" &>/dev/null \
                    && log "usr_ctl_netman: granted $_u modify access to connection $_uuid"
            fi
        done
    done

    # Revert: strip any previously-granted user from every non-Wi-Fi connection
    # once they're no longer in the group (or the group is gone).
    while IFS= read -r _old_u; do
        [[ -z "$_old_u" ]] && continue
        if ! _netman_in_desired "$_old_u"; then
            for _uuid in "${_NON_WIFI_UUIDS[@]+"${_NON_WIFI_UUIDS[@]}"}"; do
                _perms=$(nmcli -t -g connection.permissions connection show "$_uuid" 2>/dev/null)
                [[ "$_perms" == *"user:${_old_u}:"* ]] && \
                    nmcli connection modify "$_uuid" -connection.permissions "user:${_old_u}:" &>/dev/null
            done
            log "usr_ctl_netman: revoked $_old_u network-modify access (left usr_ctl_netman)"
        fi
    done < "$NETMAN_STATE"

    if [[ ${#_NETMAN_USERS[@]} -gt 0 ]]; then
        printf '%s\n' "${_NETMAN_USERS[@]}" | sort -u > "$NETMAN_STATE"
    else
        > "$NETMAN_STATE"
    fi
    unset _netman_grp_exists _NETMAN_USERS _NON_WIFI_UUIDS _u _uuid _perms _old_u
fi