How To Block Host Files Little Snitch

How To Block Host Files Little Snitch Free
How To Snitch Properly

Rule group subscriptions use a .lsrules file, which is a JSON format specified in this chapter. Such files can be exported using Little Snitch Configuration or created using a text editor or a script.

A simple example

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How To Block Host Files Little Snitch Free

Let’s start with a simple example that specifies a single rule for allowing software updates for LaunchBar:

Blocklists

A common use case for rule group subscriptions are blocklists that contain a lot of domains, hosts, or IP addresses for which access should be flat out denied. Using the above syntax, you’d have to repeat 'process': 'any' and 'action': 'deny' for each domain, host, or IP address. For thousands of rules, that can lead to unnecessarily large files that in turn lead to unnecessarily large downloads for every single subscriber.

Starting in Little Snitch 4.2, you can use a more compact format that looks like this:

Top-level keys

The top level of an .lsrules file is a JSON dictionary with the following keys:

How To Snitch Properly

While we work on getting our iOS/iPadOS application approved through Apple, the links below are provided for those that wish to use Little Snitch to block ads, trackers, miners, etc. As for the look of the site, we wanted to get something up so those with Little Snitch could start using the rules.
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Key	Type	Description
`name`	String	The name of the group.
`description`	String	A description of the rule grouop.
`rules`	Array of Dictionaries	The list of rules. See below for rule-level keys.

To efficiently support blocklists, the following keys were added in Little Snitch 4.2:

Key	Type	Description
`denied-remote-domains`	Array of Strings	A list of domain names.
`denied-remote-hosts`	Array of Strings	A list of hostnames.
`denied-remote-addresses`	Array of Strings	A list of IP addresses. See Anatomy of a rule > Server (remote computer) for supported syntax.
`denied-remote-notes`	String	The notes that should be repeated for each rule. The placeholder `%REMOTE%` will be replaced with the respective domain, host, or IP-address for each rule.

You can mix all of these keys in a single .lsrules file, i.e. you can define arbitrary rules in a rules array next to a list of domains in denied-remote-domains and a list of IP addresses in denied-remote-addresses.

Rule keys

Each rule defined in the file is a JSON dictionary with the following keys:

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Specifying the process

To define which processes a rule should match, you specify the executable of the process using the following keys:

To match any process, use:
- 'process': 'any'
To match a specific process, use:
- 'process' (String): A String containing the full path to the executable. For apps, this is path to the app’s executable, not the app wrapper. For example: /Applications/Safari.app/Contents/MacOS/Safari
- 'via' (String, optional): If the rule should only match if the executable uses a specific helper tool, you can specify its path. For example, you could create a rule that matches “Terminal via ping” by setting 'path' to Terminal’s path and 'via' to ping’s path. Note that a rule for Terminal that has no 'via' will also match connections of “Terminal via ping”.

Specifying the remote

The remote for the rule can be specified in multiple ways. You can only provide one of the following keys:

'remote-addresses': A String containing one or more IP addresses in the format described in Anatomy of a rule > Server (remote computer).
'remote-hosts': Either a String with a hostname, or an Array of Strings of hostnames.
'remote-domains': Either a String with a domain name, or an Array of Strings of domain names.
'remote': A String with exactly one of the following values. For a description of each of these values, see Anatomy of a rule > Server (remote computer).
- 'any'
- 'local-net'
- 'multicast'
- 'broadcast'
- 'bonjour'
- 'dns-servers'
- 'bpf' (Berkeley Packet Filter, available starting in Little Sntich 4.4.3)

Other keys

Key	Type	Description
`direction`	String, optional	The connection direction. `'incoming'` or `'outgoing'`, defaults to `'outgoing'`.
`action`	String, optional	The rule action. `'allow'`, `'deny'`, or `'ask'`. Defaults to `'ask'`.
`priority`	String, optional	The rule priority. `'regular'` or `'high'`. Defaults to `'regular'`.
`disabled`	Boolean, optional	Whether or not the rule is disabled by default. Defaults to `false`.
`ports`	String, optional	The ports the rule matches. Can be `'any'` for any port (the default), a single port (e.g. `'443'`), or a range of ports (e.g. `'123-456'`).
`protocol`	String, optional	The protocol the rule matches. Can be a numeric value as defined in `/etc/protocols`, like `'6'` for TCP, or the actual protocol name, like `'tcp'`. Defaults to any protocol.
`notes`	String, optional	The notes for the rule.