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| docs:guide-user:firewall:fw3_configurations:fw3_parent_controls [2021/08/18 23:04] – [Command-line instructions] vgaetera | docs:guide-user:firewall:fw3_configurations:fw3_parent_controls [2023/08/30 08:26] – [Blocking services with banIP] vgaetera | ||
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| Line 4: | Line 4: | ||
| ===== Introduction ===== | ===== Introduction ===== | ||
| * This article describes common methods to perform parental control of internet access. | * This article describes common methods to perform parental control of internet access. | ||
| - | * Make sure to apply restrictions to all source zones if you are using a firewall-based method. | + | * Be sure to apply restrictions to all source zones if you are using a firewall-based method. |
| ===== Restrict / deny / block access to certain web pages ===== | ===== Restrict / deny / block access to certain web pages ===== | ||
| Line 21: | Line 21: | ||
| * Dynamic hosts change their IP on a regular basis, invalidating the blacklist | * Dynamic hosts change their IP on a regular basis, invalidating the blacklist | ||
| - | ==== Blocking | + | ==== Blocking |
| Follow: | Follow: | ||
| [[docs: | [[docs: | ||
| Line 38: | Line 38: | ||
| ==== Blocking IPs based on their domain names (FQDN, host names) ==== | ==== Blocking IPs based on their domain names (FQDN, host names) ==== | ||
| Follow: | Follow: | ||
| - | [[docs: | + | [[docs: |
| Since OpenWrt in a typical setup with a LAN and WAN zone does the name resolution and the firewall at the same time, all information is there to match domain names, their current IPs as they are handed out to the LAN-hosts and act accordingly in the firewall. | Since OpenWrt in a typical setup with a LAN and WAN zone does the name resolution and the firewall at the same time, all information is there to match domain names, their current IPs as they are handed out to the LAN-hosts and act accordingly in the firewall. | ||
| Line 47: | Line 47: | ||
| * This will block all sites sharing the same IP with the targeted, so use carefully for domains which rely on [[wp> | * This will block all sites sharing the same IP with the targeted, so use carefully for domains which rely on [[wp> | ||
| * Completely blocking sites that use localized domains is problematic. | * Completely blocking sites that use localized domains is problematic. | ||
| + | |||
| + | ==== Blocking services with banIP ==== | ||
| + | See also: | ||
| + | [[packages: | ||
| + | [[packages: | ||
| + | |||
| + | banIP can block services using IP/CIDR lists, e.g. you can block WhatsApp with [[https:// | ||
| + | |||
| + | <code bash> | ||
| + | opkg update | ||
| + | opkg install banip luci-app-banip | ||
| + | uci set banip.global.ban_enabled=" | ||
| + | uci del_list banip.global.ban_feed=" | ||
| + | uci add_list banip.global.ban_feed=" | ||
| + | uci commit banip | ||
| + | . / | ||
| + | json_init | ||
| + | json_load_file / | ||
| + | json_add_object " | ||
| + | json_add_string " | ||
| + | json_add_string " | ||
| + | HybridNetworks/ | ||
| + | json_add_string " | ||
| + | json_close_object | ||
| + | json_dump > / | ||
| + | / | ||
| + | </ | ||
| ==== Blocking sites by using proxy servers ===== | ==== Blocking sites by using proxy servers ===== | ||
| Line 52: | Line 79: | ||
| [[docs: | [[docs: | ||
| - | A proxy server like Squid can be used to block access to websites. | + | A proxy server like [[docs: |
| It can check HTTP(S) specific details. | It can check HTTP(S) specific details. | ||
| The huge benefit of this option is to have the finest level of control. | The huge benefit of this option is to have the finest level of control. | ||
| It can even distinguish in cases where a single server with a single IP runs for example a blacklisted and whitelisted domain at once. | It can even distinguish in cases where a single server with a single IP runs for example a blacklisted and whitelisted domain at once. | ||
| + | |||
| + | Squid offers many features like SNI HTTPS based filtering, SSL-bump and splice. However, for typical resource constrained devices, Tinyproxy offers the most important options (filtering websites) as well. For parental control, due to ease of setup and low RAM/Flash requirements, | ||
| Drawbacks: | Drawbacks: | ||
| - | | + | * If not everything else except the proxy is blocked, it can be circumvented. The firewall must block the client-device from accessing the internet directly. |
| - | * Complex setup | + | * The clients need to configure the proxy in their browser. |
| - | | + | |
| ===== Time restriction of internet access ===== | ===== Time restriction of internet access ===== | ||
| - | Block internet access for MAC or IP addresses on week days during specific time interval. | + | Block internet access for MAC or IP addresses |
| <WRAP important> | <WRAP important> | ||
| Line 82: | Line 110: | ||
| * Destination zone: '' | * Destination zone: '' | ||
| * Action: reject | * Action: reject | ||
| - | - On the **Advanced Settings** tab specify: | + | - (Optional) If you want to add a MAC or IP limitation, on the **Advanced Settings** tab specify: |
| * Source MAC address: '' | * Source MAC address: '' | ||
| + | * Source IP address: '' | ||
| - On the **Time Restrictions** tab specify: | - On the **Time Restrictions** tab specify: | ||
| * Week Days: Monday, Tuesday, Wednesday, Thursday, Friday | * Week Days: Monday, Tuesday, Wednesday, Thursday, Friday | ||
| Line 110: | Line 139: | ||
| uci commit firewall | uci commit firewall | ||
| / | / | ||
| - | |||
| - | # Extra workaround for OpenWrt snapshots | ||
| - | . / | ||
| - | if [ " | ||
| - | then | ||
| - | FW_WEEKDAYS=" | ||
| - | uci -q delete firewall.@rule[-1].weekdays | ||
| - | uci set firewall.@rule[-1].extra=" | ||
| - | uci commit firewall | ||
| - | / | ||
| - | fi | ||
| </ | </ | ||
| Line 133: | Line 151: | ||
| - Only allow/deny LAN access for devices with matching MAC addresses. | - Only allow/deny LAN access for devices with matching MAC addresses. | ||
| - | This section | + | This section |
| This is a simple solution that can be invalidated by a smart hacker changing the MAC address of their device. | This is a simple solution that can be invalidated by a smart hacker changing the MAC address of their device. | ||
| Line 143: | Line 161: | ||
| * Allow listed only | * Allow listed only | ||
| * Allow all except listed | * Allow all except listed | ||
| - | * MAC List: Add the desired MAC address | + | * MAC List: |
| + | * '' | ||
| + | * '' | ||
| - Click **Save**, then **Save & Apply**. | - Click **Save**, then **Save & Apply**. | ||