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# mod_security behaviour (inets v9.4)

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Security Audit and Trailing Functionality

# Summary

## Callbacks

event(What, Port, Dir, Data)
event(What, Address, Port, Dir, Data)

`event/4` or `event/5` is called whenever an event occurs in the `mod_security` Erlang web server API module. (`event/4` is called if `Address` is undefined, otherwise `event/5`. Argument `What` specifies the type of event that has occurred and is one of the following reasons

## Functions

block_user(User, Port, Dir, Seconds)

Equivalent to `block_user/5`.

block_user(User, Address, Port, Dir, Seconds)

`block_user/4` and `block_user/5` each blocks the user `User` from directory `Dir` for a specified amount of time.

list_auth_users(Port)

Equivalent to `list_auth_users/3`.

list_auth_users/2

Equivalent to `list_auth_users/3`.

list_auth_users(Address, Port, Dir)

`list_auth_users/1`, `list_auth_users/2`, and `list_auth_users/3` each returns a list of users that are currently authenticated. Authentications are stored for `SecurityAuthTimeout` seconds, and then discarded.

list_blocked_users(Port)

Equivalent to `list_blocked_users/3`.

list_blocked_users/2

Equivalent to `list_blocked_users/3`.

list_blocked_users(Address, Port, Dir)

`list_blocked_users/1`, `list_blocked_users/2`, and `list_blocked_users/3` each returns a list of users that are currently blocked from access.

unblock_user(User, Port)

Equivalent to `unblock_user/4`.

unblock_user/3

Equivalent to `unblock_user/4`.

unblock_user(User, Address, Port, Dir)

`unblock_user/2`, `unblock_user/3`, and `unblock_user/4` each removes the user `User` from the list of blocked users for `Port` (and `Dir`).

# Callbacks

# event(What, Port, Dir, Data)

(since OTP 18.1)

    -callback event(What, Port, Dir, Data) -> term()
                       when
                           What :: auth_fail | user_block | user_unblock,
                           Port :: integer(),
                           Dir :: string(),
                           Data :: [Info],
                           Info :: {Name :: term(), Value :: term()}.

# event(What, Address, Port, Dir, Data)

(since OTP 18.1)

    -callback event(What, Address, Port, Dir, Data) -> term()
                       when
                           What :: auth_fail | user_block | user_unblock,
                           Port :: integer(),
                           Address :: inet:ip4_address() | inet:ip6_address() | string(),
                           Dir :: string(),
                           Data :: [Info],
                           Info :: {Name :: term(), Value :: term()}.

`event/4` or `event/5` is called whenever an event occurs in the `mod_security` Erlang web server API module. (`event/4` is called if `Address` is undefined, otherwise `event/5`. Argument `What` specifies the type of event that has occurred and is one of the following reasons:

- `auth_fail` - A failed user authentication.

- `user_block` - A user is being blocked from access.

- `user_unblock` - A user is being removed from the block list.

#### Note

The event `user_unblock` is not triggered when a user is removed from the block list explicitly using the `unblock_user` function.

# Functions

# block_user(User, Port, Dir, Seconds)

    -spec block_user(User, Port, Dir, Seconds) -> true | {error, Reason}
                        when
                            User :: string(),
                            Port :: inet:port_number(),
                            Dir :: string(),
                            Seconds :: non_neg_integer() | infinity,
                            Reason :: no_such_directory.

Equivalent to `block_user/5`.

# block_user(User, Address, Port, Dir, Seconds)

    -spec block_user(User, Address, Port, Dir, Seconds) -> true | {error, Reason}
                        when
                            User :: string(),
                            Port :: inet:port_number(),
                            Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                            Dir :: string(),
                            Seconds :: non_neg_integer() | infinity,
                            Reason :: no_such_directory.

`block_user/4` and `block_user/5` each blocks the user `User` from directory `Dir` for a specified amount of time.

# list_auth_users(Port)

    -spec list_auth_users(Port) -> Users | [] when Port :: inet:port_number(), Users :: [string()].

Equivalent to `list_auth_users/3`.

# list_auth_users/2

    -spec list_auth_users(Port, Directory) -> Users | []
                             when Port :: inet:port_number(), Directory :: string(), Users :: [string()];
                         (Address, Port) -> Users | []
                             when
                                 Port :: inet:port_number(),
                                 Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                 Users :: [string()].

Equivalent to `list_auth_users/3`.

# list_auth_users(Address, Port, Dir)

    -spec list_auth_users(Address, Port, Dir) -> Users | []
                             when
                                 Port :: inet:port_number(),
                                 Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                 Dir :: string(),
                                 Users :: [string()].

`list_auth_users/1`, `list_auth_users/2`, and `list_auth_users/3` each returns a list of users that are currently authenticated. Authentications are stored for `SecurityAuthTimeout` seconds, and then discarded.

# list_blocked_users(Port)

    -spec list_blocked_users(Port) -> Users | []
                                when
                                    Port :: integer(),
                                    Users :: [{blocked_user, term(), term(), term(), term()}].

Equivalent to `list_blocked_users/3`.

# list_blocked_users/2

    -spec list_blocked_users(Port, Directory) -> Users | []
                                when
                                    Port :: integer(),
                                    Directory :: string(),
                                    Users :: [{blocked_user, term(), term(), term(), term()}];
                            (Address, Port) -> Users | []
                                when
                                    Port :: integer(),
                                    Address ::
                                        inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                    Users :: [{blocked_user, term(), term(), term(), term()}].

Equivalent to `list_blocked_users/3`.

# list_blocked_users(Address, Port, Dir)

    -spec list_blocked_users(Address, Port, Dir) -> Users | []
                                when
                                    Port :: integer(),
                                    Address ::
                                        inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                    Dir :: string(),
                                    Users :: [{blocked_user, term(), term(), term(), term()}].

`list_blocked_users/1`, `list_blocked_users/2`, and `list_blocked_users/3` each returns a list of users that are currently blocked from access.

# unblock_user(User, Port)

    -spec unblock_user(User, Port) -> true | {error, Reason}
                          when User :: string(), Port :: integer(), Reason :: term().

Equivalent to `unblock_user/4`.

# unblock_user/3

    -spec unblock_user(User, Port, Directory) -> true | {error, Reason}
                          when User :: string(), Port :: integer(), Directory :: string(), Reason :: term();
                      (User, Address, Port) -> true | {error, Reason}
                          when
                              User :: string(),
                              Port :: integer(),
                              Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                              Reason :: term().

Equivalent to `unblock_user/4`.

# unblock_user(User, Address, Port, Dir)

    -spec unblock_user(User, Address, Port, Dir) -> true | {error, Reason}
                          when
                              User :: string(),
                              Port :: integer(),
                              Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                              Dir :: string(),
                              Reason :: term().

`unblock_user/2`, `unblock_user/3`, and `unblock_user/4` each removes the user `User` from the list of blocked users for `Port` (and `Dir`).