Аутентификация и авторизация
Реализуйте надёжные механизмы аутентификации и авторизации для процессов и пользователей, получающих доступ к службам Erlang.
«Аутентификация и авторизация» — бесплатный урок Erlang OTP: Distributed & Fault-Tolerant Systems Programming на CoddyKit. Это урок 2 из 4. Ты можешь прочитать весь урок бесплатно ниже — а потом практиковать его прямо в браузере с встроенным редактором кода и ИИ-репетитором 24/7. Это часть пути обучения Erlang OTP: Distributed & Fault-Tolerant Systems Programming, и твой прогресс синхронизируется между веб-версией и приложением CoddyKit. Курс Erlang OTP: Distributed & Fault-Tolerant Systems Programming содержит 4 уроков всего.
Части этого урока еще не переведены и отображаются на английском.
AuthN & AuthZ Explained
In distributed systems, knowing who is accessing your services and what they are allowed to do is critical for security. This is where authentication and authorization come in.
- Authentication (AuthN): Verifies the identity of a user or process. It answers the question, "Who are you?"
- Authorization (AuthZ): Determines if an authenticated user or process has permission to perform a specific action or access a resource. It answers, "What are you allowed to do?"
They work hand-in-hand to secure your Erlang applications.
Identifying Users
For user authentication, we typically verify credentials like a username and password. In Erlang, you might have a dedicated service (often a GenServer) responsible for managing user accounts and validating login attempts.
This service would receive a login request, check the provided credentials against stored data, and respond with either success or failure. On success, it might issue a session ID or token.
Building an Auth GenServer
Let's create a very basic auth_service using GenServer. For simplicity, it will store a hardcoded user and password. In a real system, you'd integrate with a database and securely hash passwords.
Our auth_service will have a login/2 function that clients can call to authenticate.
Runnable Auth Service
Try running this simple authentication service. You can call auth_service:login("user", "pass") and auth_service:login("wrong", "pass") to see the different responses.
-module(auth_service).
-behaviour(gen_server).
-export([start_link/0, login/2]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
% Client API
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
login(Username, Password) ->
gen_server:call(?MODULE, {login, Username, Password}).
% GenServer Callbacks
init([]) ->
% Store a simple user/pass for demonstration
Users = #{<<"user">> => <<"pass">>},
{ok, Users}.
handle_call({login, Username, Password}, _From, State) ->
case maps:get(Username, State, undefined) of
Password ->
{reply, {ok, <<"authenticated">>}, State};
_ ->
{reply, {error, <<"invalid_credentials">>}, State}
end;
handle_call(_Request, _From, State) ->
{reply, {error, unknown_request}, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.What Can You Do?
Once a user is authenticated, the next step is authorization. This means deciding what actions they are allowed to perform. A common way to manage this is through Role-Based Access Control (RBAC).
- Roles: Groups of permissions (e.g.,
admin,editor,viewer). - Permissions: Specific actions (e.g.,
create_post,edit_post,delete_post).
Users are assigned roles, and roles are assigned permissions.
Role-Based Access Control
We can extend our auth_service (or a separate service) to manage roles and permissions. It would need to know:
- Which roles a user has.
- Which permissions each role grants.
Then, when a service needs to check if a user can perform an action, it asks the authorization service.
Auth Service with RBAC
Here's an updated auth_service that includes a basic RBAC mechanism. It defines roles and permissions and allows checking if a user has a specific permission.
Try calling auth_service:check_permission("user", "read_data") and auth_service:check_permission("user", "delete_data") after logging in.
-module(auth_service).
-behaviour(gen_server).
-export([start_link/0, login/2, check_permission/2]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
% Client API
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
login(Username, Password) ->
gen_server:call(?MODULE, {login, Username, Password}).
check_permission(Username, Permission) ->
gen_server:call(?MODULE, {check_permission, Username, Permission}).
% GenServer Callbacks
init([]) ->
Users = #{
<<"user">> => #{
password => <<"pass">>,
roles => [<<"viewer">>, <<"editor">>]
},
<<"admin">> => #{
password => <<"admin_pass">>,
roles => [<<"admin">>, <<"viewer">>]
}
},
Roles = #{
<<"viewer">> => [<<"read_data">>],
<<"editor">> => [<<"read_data">>, <<"write_data">>],
<<"admin">> => [<<"read_data">>, <<"write_data">>, <<"delete_data">>]
},
{ok, #{users => Users, roles => Roles}}.
handle_call({login, Username, Password}, _From, State) ->
Users = maps:get(users, State),
case maps:get(Username, Users, undefined) of
#{password := Password} ->
{reply, {ok, <<"authenticated">>}, State};
_ ->
{reply, {error, <<"invalid_credentials">>}, State}
end;
handle_call({check_permission, Username, Permission}, _From, State) ->
Users = maps:get(users, State),
Roles = maps:get(roles, State),
case maps:get(Username, Users, undefined) of
#{roles := UserRoles} ->
HasPermission = lists:any(
fun(Role) ->
case maps:get(Role, Roles, []) of
RolePermissions when is_list(RolePermissions) ->
lists:member(Permission, RolePermissions);
_ -> false
end
end,
UserRoles
),
{reply, HasPermission, State};
_ ->
{reply, false, State} % User not found or not authenticated
end;
handle_call(_Request, _From, State) ->
{reply, {error, unknown_request}, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.Securing Your Services
Once you have an authentication and authorization service, other services in your system can use it. A typical flow looks like this:
- Client Authenticates: Calls
auth_service:login/2. - Receives Session/Token: If successful, the client gets a session ID or token (e.g., a process ID, or a more complex JWT).
- Client Makes Authorized Request: When calling another service (e.g.,
data_service), the client includes its session/token and the action it wants to perform. - Service Authorizes: The
data_servicecallsauth_service:check_permission/2using the client's identity and the requested action. - Service Responds: If authorized, the action proceeds; otherwise, an error is returned.
Beyond Basic Auth
While our examples are simple, real-world systems need more:
- Password Hashing: Never store plaintext passwords. Use strong hashing algorithms like
bcryptorpbkdf2. - Session Management: Securely generate, store, and validate session tokens. Ensure they expire and can be revoked.
- Auditing: Log all authentication attempts and authorization checks for security monitoring and forensics.
- External Identity Providers: Integrate with OAuth2/OpenID Connect for single sign-on.
Erlang's concurrency makes it great for building robust auth services.
AuthN vs AuthZ Check
Consider a user trying to access a secure document in an Erlang application.
Recap: Securing Services
We've covered the fundamentals of authentication and authorization in Erlang:
- Authentication (AuthN) verifies identity ("Who are you?").
- Authorization (AuthZ) determines permissions ("What can you do?").
- We built a simple
auth_serviceusing GenServer for both user login and role-based access control (RBAC). - Understanding how to integrate these services is key to building secure and robust distributed Erlang applications.
Next, explore how to protect sensitive data itself within your Erlang applications.
Часто задаваемые вопросы
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Чему я научусь в уроке «Аутентификация и авторизация»?
Реализуйте надёжные механизмы аутентификации и авторизации для процессов и пользователей, получающих доступ к службам Erlang. Ты практикуешь Erlang OTP: Distributed & Fault-Tolerant Systems Programming с помощью реального кода, который запускаешь прямо в браузере, и ИИ-репетитор 24/7 отвечает на твои вопросы во время урока.
Нужен ли мне опыт, чтобы начать Erlang OTP: Distributed & Fault-Tolerant Systems Programming?
Предыдущий опыт не требуется. Erlang OTP: Distributed & Fault-Tolerant Systems Programming на CoddyKit структурирован для всех уровней — от новичков до продвинутых, поэтому ты можешь начать отсюда или с самого начала и учиться в своем темпе. Это урок 2 из 4.
Сколько времени занимает урок «Аутентификация и авторизация»?
Большинство уроков CoddyKit занимают около 5–10 минут. Каждый из них компактный и интерактивный, поэтому ты постоянно делаешь прогресс и продолжаешь с того же места в веб-версии и приложении.
Можно ли писать и запускать код в этом уроке Erlang OTP: Distributed & Fault-Tolerant Systems Programming?
Да. Каждый урок Erlang OTP: Distributed & Fault-Tolerant Systems Programming включает встроенный редактор кода, поэтому ты пишешь и запускаешь реальный код прямо в браузере и получаешь моментальную обратную связь от AI — локальная установка не требуется.
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