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# mod_auth (inets v9.3.2.2)

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User authentication using text files, Dets, or Mnesia database.

This module provides for basic user authentication using textual files, Dets databases, or Mnesia databases.

### See also

`httpd`, `mod_alias`

# Summary

## Types

httpd_group()
httpd_user()

## Functions

add_group_member(GroupName, UserName, Options)

Equivalent to `add_group_member/5`.

add_group_member(GroupName, UserName, Port, Directory)

Equivalent to `add_group_member/5`.

add_group_member(GroupName, UserName, Address, Port, Directory)

`add_group_member/3`, `add_group_member/4`, and `add_group_member/5` each adds a user to a group. If the group does not exist, it is created and the user is added to the group. Upon successful operation, this function returns `true`. When `add_group_members/3` is called, options `Port` and `Dir` are mandatory.

add_user(UserName, Options)

Equivalent to `add_user/6`.

add_user(UserName, Password, UserData, Port, Directory)

Equivalent to `add_user/6`.

add_user(UserName, Password, UserData, Address, Port, Directory)

add_user(UserName, Password, UserData, Address, Port, Dir) -> true | {error, Reason}

delete_group(GroupName, Options)

Equivalent to `delete_group/4`.

delete_group(GroupName, Port, Directory)

Equivalent to `delete_group(GroupName, undefined, Port, Dir)`.

delete_group(GroupName, Address, Port, Directory)

`delete_group/2`, `delete_group/3`, and `delete_group/4` each deletes the group specified and returns `true`. If there is an error, `{error, Reason}` is returned. When `delete_group/2` is called, option `Port` and `Dir` are mandatory.

delete_group_member(GroupName, UserName, Options)

Equivalent to `delete_group_member/5`.

delete_group_member(GroupName, UserName, Port, Directory)

Equivalent to `delete_group_member/5`.

delete_group_member(GroupName, UserName, Address, Port, Directory)

`delete_group_member/3`, `delete_group_member/4`, and `delete_group_member/5` each deletes a user from a group. If the group or the user does not exist, this function returns an error, otherwise `true`. When `delete_group_member/3` is called, the options `Port` and `Dir` are mandatory.

delete_user(UserName, Options)

Equivalent to `delete_user/4`.

delete_user(UserName, Port, Directory)

Equivalent to `delete_user/4`.

delete_user(UserName, Address, Port, Directory)

`delete_user/2`, `delete_user/3`, and `delete_user/4` each deletes a user from the user database. If the operation is successful, this function returns `true`. If an error occurs, `{error, Reason}` is returned. When `delete_user/2` is called, options `Port` and `Dir` are mandatory.

get_user(UserName, Options)

Equivalent to `get_user/4`.

get_user(UserName, Port, Directory)

Equivalent to `get_user/4`.

get_user(UserName, Address, Port, Directory)

`get_user/2`, `get_user/3`, and `get_user/4` each returns an `httpd_user/0` record containing the userdata for a specific user. If the user cannot be found, `{error, Reason}` is returned. When `get_user/2` is called, options `Port` and `Dir` are mandatory.

list_group_members(GroupName, Options)

Equivalent to `list_group_members/4`.

list_group_members(GroupName, Port, Directory)

Equivalent to `list_group_members/4`.

list_group_members(GroupName, Address, Port, Directory)

`list_group_members/2`, `list_group_members/3`, and `list_group_members/4` each lists the members of a specified group. If the group does not exist or there is an error, `{error, Reason}` is returned. When `list_group_members/2` is called, options `Port` and `Dir` are mandatory.

list_groups(Options)

Equivalent to `list_groups/3`.

list_groups(Port, Directory)

Equivalent to `list_groups/3`.

list_groups(Address, Port, Directory)

`list_groups/1`, `list_groups/2`, and `list_groups/3` each lists all the groups available. If there is an error, `{error, Reason}` is returned. When `list_groups/1` is called, options `Port` and `Dir` are mandatory.

list_users(Options)

Equivalent to `list_users/3`.

list_users(Port, Directory)

Equivalent to `list_users/3`.

list_users(Address, Port, Directory)

`list_users/1`, `list_users/2`, and `list_users/3` each returns a list of users in the user database for a specific `Port/Dir`. When `list_users/1` is called, options `Port` and `Dir` are mandatory.

update_password(Port, Dir, OldPassword, NewPassword, NewPassword)

Equivalent to `update_password/6`.

update_password(Address, Port, Dir, OldPassword, NewPassword, NewPassword)

`update_password/5` and `update_password/6` each updates `AuthAccessPassword` for the specified directory. If `NewPassword` is equal to "NoPassword", no password is required to change authorisation data. If `NewPassword` is equal to "DummyPassword", no changes can be done without changing the password first.

# Types

# httpd_group()

(not exported)

    -type httpd_group() :: #httpd_group{name :: term(), userlist :: term()}.

# httpd_user()

(not exported)

    -type httpd_user() :: #httpd_user{username :: term(), password :: term(), user_data :: term()}.

# Functions

# add_group_member(GroupName, UserName, Options)

    -spec add_group_member(GroupName, UserName, Options) -> true | {error, Reason}
                              when
                                  GroupName :: string(),
                                  UserName :: string(),
                                  Options ::
                                      [{port, Port} |
                                       {addr, Address} |
                                       {dir, Directory} |
                                       {authPassword, AuthPassword}],
                                  Port :: inet:port_number(),
                                  Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                  Directory :: string(),
                                  AuthPassword :: string(),
                                  Reason :: term().

Equivalent to `add_group_member/5`.

# add_group_member(GroupName, UserName, Port, Directory)

    -spec add_group_member(GroupName, UserName, Port, Directory) -> true | {error, Reason}
                              when
                                  GroupName :: string(),
                                  UserName :: string(),
                                  Port :: inet:port_number(),
                                  Directory :: string(),
                                  Reason :: term().

Equivalent to `add_group_member/5`.

# add_group_member(GroupName, UserName, Address, Port, Directory)

    -spec add_group_member(GroupName, UserName, Address, Port, Directory) -> true | {error, Reason}
                              when
                                  GroupName :: string(),
                                  UserName :: string(),
                                  Port :: inet:port_number(),
                                  Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                  Directory :: string(),
                                  Reason :: term().

`add_group_member/3`, `add_group_member/4`, and `add_group_member/5` each adds a user to a group. If the group does not exist, it is created and the user is added to the group. Upon successful operation, this function returns `true`. When `add_group_members/3` is called, options `Port` and `Dir` are mandatory.

# add_user(UserName, Options)

    -spec add_user(UserName, Options) -> true | {error, Reason}
                      when
                          UserName :: string(),
                          Options ::
                              [{password, Password} |
                               {userData, UserData} |
                               {port, Port} |
                               {addr, Address} |
                               {dir, Directory} |
                               {authPassword, AuthPassword}],
                          Password :: string(),
                          UserData :: term(),
                          Port :: inet:port_number(),
                          Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                          Directory :: string(),
                          AuthPassword :: string(),
                          Reason :: term().

Equivalent to `add_user/6`.

# add_user(UserName, Password, UserData, Port, Directory)

    -spec add_user(UserName, Password, UserData, Port, Directory) -> true | {error, Reason}
                      when
                          UserName :: string(),
                          Password :: string(),
                          UserData :: term(),
                          Port :: inet:port_number(),
                          Directory :: string(),
                          Reason :: term().

Equivalent to `add_user/6`.

# add_user(UserName, Password, UserData, Address, Port, Directory)

    -spec add_user(UserName, Password, UserData, Address, Port, Directory) -> true | {error, Reason}
                      when
                          UserName :: string(),
                          Password :: string(),
                          UserData :: term(),
                          Port :: inet:port_number(),
                          Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                          Directory :: string(),
                          Reason :: term().

add_user(UserName, Password, UserData, Address, Port, Dir) -> true | {error, Reason}

`add_user/2, add_user/5`, and `add_user/6` each adds a user to the user database. If the operation is successful, this function returns `true`. If an error occurs, `{error, Reason}` is returned. When `add_user/2` is called, options `Password`, `UserData`, `Port`, and `Dir` are mandatory.

# delete_group(GroupName, Options)

    -spec delete_group(GroupName, Options) -> true | {error, Reason}
                          when
                              GroupName :: string(),
                              Options ::
                                  [{port, Port} |
                                   {addr, Address} |
                                   {dir, Directory} |
                                   {authPassword, AuthPassword}],
                              Port :: inet:port_number(),
                              Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                              Directory :: string(),
                              AuthPassword :: string(),
                              Reason :: term().

Equivalent to `delete_group/4`.

# delete_group(GroupName, Port, Directory)

    -spec delete_group(GroupName, Port, Directory) -> true | {error, Reason}
                          when
                              GroupName :: string(),
                              Port :: inet:port_number(),
                              Directory :: string(),
                              Reason :: term().

Equivalent to `delete_group(GroupName, undefined, Port, Dir)`.

# delete_group(GroupName, Address, Port, Directory)

    -spec delete_group(GroupName, Address, Port, Directory) -> true | {error, Reason}
                          when
                              GroupName :: string(),
                              Port :: inet:port_number(),
                              Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                              Directory :: string(),
                              Reason :: term().

`delete_group/2`, `delete_group/3`, and `delete_group/4` each deletes the group specified and returns `true`. If there is an error, `{error, Reason}` is returned. When `delete_group/2` is called, option `Port` and `Dir` are mandatory.

# delete_group_member(GroupName, UserName, Options)

    -spec delete_group_member(GroupName, UserName, Options) -> true | {error, Reason}
                                 when
                                     GroupName :: string(),
                                     UserName :: string(),
                                     Options ::
                                         [{port, Port} |
                                          {addr, Address} |
                                          {dir, Directory} |
                                          {authPassword, AuthPassword}],
                                     Port :: inet:port_number(),
                                     Address ::
                                         inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                     Directory :: string(),
                                     AuthPassword :: string(),
                                     Reason :: term().

Equivalent to `delete_group_member/5`.

# delete_group_member(GroupName, UserName, Port, Directory)

    -spec delete_group_member(GroupName, UserName, Port, Directory) -> true | {error, Reason}
                                 when
                                     GroupName :: string(),
                                     UserName :: string(),
                                     Port :: inet:port_number(),
                                     Directory :: string(),
                                     Reason :: term().

Equivalent to `delete_group_member/5`.

# delete_group_member(GroupName, UserName, Address, Port, Directory)

    -spec delete_group_member(GroupName, UserName, Address, Port, Directory) -> true | {error, Reason}
                                 when
                                     GroupName :: string(),
                                     UserName :: string(),
                                     Port :: inet:port_number(),
                                     Address ::
                                         inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                     Directory :: string(),
                                     Reason :: term().

`delete_group_member/3`, `delete_group_member/4`, and `delete_group_member/5` each deletes a user from a group. If the group or the user does not exist, this function returns an error, otherwise `true`. When `delete_group_member/3` is called, the options `Port` and `Dir` are mandatory.

# delete_user(UserName, Options)

    -spec delete_user(UserName, Options) -> true | {error, Reason}
                         when
                             UserName :: string(),
                             Options ::
                                 [{port, Port} |
                                  {addr, Address} |
                                  {dir, Directory} |
                                  {authPassword, AuthPassword}],
                             Port :: inet:port_number(),
                             Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                             Directory :: string(),
                             AuthPassword :: string(),
                             Reason :: term().

Equivalent to `delete_user/4`.

# delete_user(UserName, Port, Directory)

    -spec delete_user(UserName, Port, Directory) -> true | {error, Reason}
                         when
                             UserName :: string(),
                             Port :: inet:port_number(),
                             Directory :: string(),
                             Reason :: term().

Equivalent to `delete_user/4`.

# delete_user(UserName, Address, Port, Directory)

    -spec delete_user(UserName, Address, Port, Directory) -> true | {error, Reason}
                         when
                             UserName :: string(),
                             Port :: inet:port_number(),
                             Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                             Directory :: string(),
                             Reason :: term().

`delete_user/2`, `delete_user/3`, and `delete_user/4` each deletes a user from the user database. If the operation is successful, this function returns `true`. If an error occurs, `{error, Reason}` is returned. When `delete_user/2` is called, options `Port` and `Dir` are mandatory.

# get_user(UserName, Options)

    -spec get_user(UserName, Options) -> {ok, User} | {error, Reason}
                      when
                          UserName :: string(),
                          Options ::
                              [{port, Port} |
                               {addr, Address} |
                               {dir, Directory} |
                               {authPassword, AuthPassword}],
                          User :: httpd_user(),
                          Port :: inet:port_number(),
                          Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                          Directory :: string(),
                          AuthPassword :: string(),
                          Reason :: term().

Equivalent to `get_user/4`.

# get_user(UserName, Port, Directory)

    -spec get_user(UserName, Port, Directory) -> {ok, User} | {error, Reason}
                      when
                          UserName :: string(),
                          User :: httpd_user(),
                          Port :: inet:port_number(),
                          Directory :: string(),
                          Reason :: term().

Equivalent to `get_user/4`.

# get_user(UserName, Address, Port, Directory)

    -spec get_user(UserName, Address, Port, Directory) -> {ok, User} | {error, Reason}
                      when
                          UserName :: string(),
                          User :: httpd_user(),
                          Port :: inet:port_number(),
                          Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                          Directory :: string(),
                          Reason :: term().

`get_user/2`, `get_user/3`, and `get_user/4` each returns an `httpd_user/0` record containing the userdata for a specific user. If the user cannot be found, `{error, Reason}` is returned. When `get_user/2` is called, options `Port` and `Dir` are mandatory.

# list_group_members(GroupName, Options)

    -spec list_group_members(GroupName, Options) -> {ok, Users} | {error, Reason}
                                when
                                    GroupName :: string(),
                                    Options ::
                                        [{port, Port} |
                                         {addr, Address} |
                                         {dir, Directory} |
                                         {authPassword, AuthPassword}],
                                    Port :: inet:port_number(),
                                    Address ::
                                        inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                    Directory :: string(),
                                    Users :: [httpd_user()],
                                    AuthPassword :: string(),
                                    Reason :: term().

Equivalent to `list_group_members/4`.

# list_group_members(GroupName, Port, Directory)

    -spec list_group_members(GroupName, Port, Directory) -> {ok, Users} | {error, Reason}
                                when
                                    GroupName :: string(),
                                    Port :: inet:port_number(),
                                    Directory :: string(),
                                    Users :: [httpd_user()],
                                    Reason :: term().

Equivalent to `list_group_members/4`.

# list_group_members(GroupName, Address, Port, Directory)

    -spec list_group_members(GroupName, Address, Port, Directory) -> {ok, Users} | {error, Reason}
                                when
                                    GroupName :: string(),
                                    Port :: inet:port_number(),
                                    Address ::
                                        inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                    Directory :: string(),
                                    Users :: [httpd_user()],
                                    Reason :: term().

`list_group_members/2`, `list_group_members/3`, and `list_group_members/4` each lists the members of a specified group. If the group does not exist or there is an error, `{error, Reason}` is returned. When `list_group_members/2` is called, options `Port` and `Dir` are mandatory.

# list_groups(Options)

    -spec list_groups(Options) -> {ok, Groups} | {error, Reason}
                         when
                             Options ::
                                 [{port, Port} |
                                  {addr, Address} |
                                  {dir, Directory} |
                                  {authPassword, AuthPassword}],
                             Port :: inet:port_number(),
                             Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                             Directory :: string(),
                             Groups :: [httpd_group()],
                             AuthPassword :: string(),
                             Reason :: term().

Equivalent to `list_groups/3`.

# list_groups(Port, Directory)

    -spec list_groups(Port, Directory) -> {ok, Groups} | {error, Reason}
                         when
                             Port :: inet:port_number(),
                             Directory :: string(),
                             Groups :: [httpd_group()],
                             Reason :: term().

Equivalent to `list_groups/3`.

# list_groups(Address, Port, Directory)

    -spec list_groups(Address, Port, Directory) -> {ok, Groups} | {error, Reason}
                         when
                             Port :: inet:port_number(),
                             Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                             Directory :: string(),
                             Groups :: [httpd_group()],
                             Reason :: term().

`list_groups/1`, `list_groups/2`, and `list_groups/3` each lists all the groups available. If there is an error, `{error, Reason}` is returned. When `list_groups/1` is called, options `Port` and `Dir` are mandatory.

# list_users(Options)

    -spec list_users(Options) -> {ok, Users} | {error, Reason}
                        when
                            Options ::
                                [{port, Port} |
                                 {addr, Address} |
                                 {dir, Directory} |
                                 {authPassword, AuthPassword}],
                            Port :: inet:port_number(),
                            Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                            Directory :: string(),
                            Users :: [httpd_user()],
                            AuthPassword :: string(),
                            Reason :: atom().

Equivalent to `list_users/3`.

# list_users(Port, Directory)

(since OTP R14B01)

    -spec list_users(Port, Directory) -> {ok, Users} | {error, Reason}
                        when
                            Port :: inet:port_number(),
                            Directory :: string(),
                            Users :: [httpd_user()],
                            Reason :: atom().

Equivalent to `list_users/3`.

# list_users(Address, Port, Directory)

    -spec list_users(Address, Port, Directory) -> {ok, Users} | {error, Reason}
                        when
                            Port :: inet:port_number(),
                            Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                            Directory :: string(),
                            Users :: [httpd_user()],
                            Reason :: atom().

`list_users/1`, `list_users/2`, and `list_users/3` each returns a list of users in the user database for a specific `Port/Dir`. When `list_users/1` is called, options `Port` and `Dir` are mandatory.

# update_password(Port, Dir, OldPassword, NewPassword, NewPassword)

    -spec update_password(Port, Dir, OldPassword, NewPassword, NewPassword) -> ok | {error, Reason}
                             when
                                 Port :: inet:port_number(),
                                 Dir :: string(),
                                 OldPassword :: string(),
                                 NewPassword :: string(),
                                 Reason :: term().

Equivalent to `update_password/6`.

# update_password(Address, Port, Dir, OldPassword, NewPassword, NewPassword)

    -spec update_password(Address, Port, Dir, OldPassword, NewPassword, NewPassword) -> ok | {error, Reason}
                             when
                                 Address :: inet:ip4_address() | inet:ip6_address() | string() | undefined,
                                 Port :: inet:port_number(),
                                 Dir :: string(),
                                 OldPassword :: string(),
                                 NewPassword :: string(),
                                 Reason :: term().

`update_password/5` and `update_password/6` each updates `AuthAccessPassword` for the specified directory. If `NewPassword` is equal to "NoPassword", no password is required to change authorisation data. If `NewPassword` is equal to "DummyPassword", no changes can be done without changing the password first.