diff --git a/internal/app/server.go b/internal/app/server.go
index 1ddd60f..7c04c2b 100644
--- a/internal/app/server.go
+++ b/internal/app/server.go
@@ -28,7 +28,6 @@ func (s *Server) Ping(context.Context, *proto.PingReq) (*proto.PingRsp, error) {
 	return &proto.PingRsp{}, nil
 }
 
-// AddUser implements proto.SmmCoreServer.
 func (s *Server) AddUser(ctx context.Context, req *proto.AddUserReq) (*proto.User, error) {
 	user, err := s.userService.AddUser(
 		ctx,
@@ -46,9 +45,21 @@ func (s *Server) AddUser(ctx context.Context, req *proto.AddUserReq) (*proto.Use
 	}, nil
 }
 
-// Login implements proto.SmmCoreServer.
-func (s *Server) Login(context.Context, *proto.LoginReq) (*proto.User, error) {
-	panic("unimplemented")
+func (s *Server) Login(ctx context.Context, req *proto.LoginReq) (*proto.User, error) {
+	user, err := s.userService.Login(
+		ctx,
+		&user.UserEntity{
+			Username: req.Username,
+			Password: req.Password,
+		},
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &proto.User{
+		Id:       int32(user.Id),
+		Username: req.Username,
+	}, nil
 }
 
 // AddBudget implements proto.SmmCoreServer.
diff --git a/internal/services/requests.restbook b/internal/services/requests.restbook
index d6cb151..5f86a55 100644
--- a/internal/services/requests.restbook
+++ b/internal/services/requests.restbook
@@ -1 +1 @@
-[{"kind":1,"language":"markdown","value":"# Добавление пользователя","outputs":[]},{"kind":2,"language":"rest-book","value":"POST http://localhost:8090/users\nauthorization: Y3JhYjpjcmFi\n\n{\n    \"username\": \"foo\",\n    \"password\": \"bar\"\n}","outputs":[{"mime":"x-application/rest-book","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Thu, 21 Nov 2024 08:10:55 GMT","Content-Type":"application/json","Content-Length":"65"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":35}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/users","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo","password":"bar"}},"data":{"code":2,"message":"username already exists error","details":[]}}},{"mime":"text/x-json","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Thu, 21 Nov 2024 08:10:55 GMT","Content-Type":"application/json","Content-Length":"65"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":35}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/users","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo","password":"bar"}},"data":{"code":2,"message":"username already exists error","details":[]}}},{"mime":"text/html","value":"[object Object]"}]},{"kind":1,"language":"markdown","value":"# Добавление категории","outputs":[]},{"kind":2,"language":"rest-book","value":"POST http://localhost:8090/categories\nUser-Id: 1\n\n{\n    \"name\": \"Продукты питания\"\n}","outputs":[{"mime":"x-application/rest-book","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Wed, 20 Nov 2024 16:25:26 GMT","Content-Type":"application/json","Content-Length":"184"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","User-Id":"2","User-Agent":"axios/0.21.4","Content-Length":42}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/categories","timeout":10000,"headers":{"User-Id":"2"},"data":{"name":"Продукты питания"}},"data":{"code":2,"message":"unable to insert row: ERROR: insert or update on table \"categories\" violates foreign key constraint \"categories_user_id_fkey\" (SQLSTATE 23503)","details":[]}}},{"mime":"text/x-json","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Wed, 20 Nov 2024 16:25:26 GMT","Content-Type":"application/json","Content-Length":"184"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","User-Id":"2","User-Agent":"axios/0.21.4","Content-Length":42}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/categories","timeout":10000,"headers":{"User-Id":"2"},"data":{"name":"Продукты питания"}},"data":{"code":2,"message":"unable to insert row: ERROR: insert or update on table \"categories\" violates foreign key constraint \"categories_user_id_fkey\" (SQLSTATE 23503)","details":[]}}},{"mime":"text/html","value":"[object Object]"}]}]
\ No newline at end of file
+[{"kind":1,"language":"markdown","value":"# Добавление пользователя","outputs":[]},{"kind":2,"language":"rest-book","value":"POST http://localhost:8090/users\nauthorization: Y3JhYjpjcmFi\n\n{\n    \"username\": \"foo\",\n    \"password\": \"bar\"\n}","outputs":[{"mime":"x-application/rest-book","value":{"status":200,"statusText":"OK","headers":{"Date":"Thu, 21 Nov 2024 09:02:06 GMT","Content-Type":"application/json","Content-Length":"27"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":36}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/users","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo3","password":"bar"}},"data":{"id":5,"username":"foo3"}}},{"mime":"text/x-json","value":{"status":200,"statusText":"OK","headers":{"Date":"Thu, 21 Nov 2024 09:02:06 GMT","Content-Type":"application/json","Content-Length":"27"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":36}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/users","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo3","password":"bar"}},"data":{"id":5,"username":"foo3"}}},{"mime":"text/html","value":"[object Object]"}]},{"kind":1,"language":"markdown","value":"# Авторизация","outputs":[]},{"kind":2,"language":"rest-book","value":"POST http://localhost:8090/login\nauthorization: Y3JhYjpjcmFi\n\n{\n    \"username\": \"foo\",\n    \"password\": \"bar\"\n}","outputs":[{"mime":"x-application/rest-book","value":{"status":200,"statusText":"OK","headers":{"Date":"Thu, 21 Nov 2024 09:02:13 GMT","Content-Type":"application/json","Content-Length":"26"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":35}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/login","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo","password":"bar"}},"data":{"id":1,"username":"foo"}}},{"mime":"text/x-json","value":{"status":200,"statusText":"OK","headers":{"Date":"Thu, 21 Nov 2024 09:02:13 GMT","Content-Type":"application/json","Content-Length":"26"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","authorization":"Y3JhYjpjcmFi","User-Agent":"axios/0.21.4","Content-Length":35}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/login","timeout":10000,"headers":{"authorization":"Y3JhYjpjcmFi"},"data":{"username":"foo","password":"bar"}},"data":{"id":1,"username":"foo"}}},{"mime":"text/html","value":"[object Object]"}]},{"kind":1,"language":"markdown","value":"# Добавление категории","outputs":[]},{"kind":2,"language":"rest-book","value":"POST http://localhost:8090/categories\nUser-Id: 1\n\n{\n    \"name\": \"Продукты питания\"\n}","outputs":[{"mime":"x-application/rest-book","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Wed, 20 Nov 2024 16:25:26 GMT","Content-Type":"application/json","Content-Length":"184"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","User-Id":"2","User-Agent":"axios/0.21.4","Content-Length":42}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/categories","timeout":10000,"headers":{"User-Id":"2"},"data":{"name":"Продукты питания"}},"data":{"code":2,"message":"unable to insert row: ERROR: insert or update on table \"categories\" violates foreign key constraint \"categories_user_id_fkey\" (SQLSTATE 23503)","details":[]}}},{"mime":"text/x-json","value":{"status":500,"statusText":"Internal Server Error","headers":{"Date":"Wed, 20 Nov 2024 16:25:26 GMT","Content-Type":"application/json","Content-Length":"184"},"config":{"timeout":10000,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","headers":{"Accept":"application/json, text/plain, */*","Content-Type":"application/json","User-Id":"2","User-Agent":"axios/0.21.4","Content-Length":42}},"request":{"method":"POST","httpVersion":"1.1","responseUrl":"http://localhost:8090/categories","timeout":10000,"headers":{"User-Id":"2"},"data":{"name":"Продукты питания"}},"data":{"code":2,"message":"unable to insert row: ERROR: insert or update on table \"categories\" violates foreign key constraint \"categories_user_id_fkey\" (SQLSTATE 23503)","details":[]}}},{"mime":"text/html","value":"[object Object]"}]}]
\ No newline at end of file
diff --git a/internal/services/user/user_service.go b/internal/services/user/user_service.go
index f4ac294..4596869 100644
--- a/internal/services/user/user_service.go
+++ b/internal/services/user/user_service.go
@@ -24,6 +24,12 @@ func (e *UsernameAlreadyExistsErr) Error() string {
 	return "username already exists error"
 }
 
+type UserNotFoundErr struct{}
+
+func (e *UserNotFoundErr) Error() string {
+	return "user not found error"
+}
+
 type UserService struct {
 	db *pgxpool.Pool
 }
@@ -54,6 +60,18 @@ func (s *UserService) AddUser(ctx context.Context, user *UserEntity) (*UserEntit
 	return user, nil
 }
 
+func (s *UserService) Login(ctx context.Context, user *UserEntity) (*UserEntity, error) {
+	query := `SELECT id FROM users WHERE username = @username AND password = @password`
+	args := pgx.NamedArgs{
+		"username": user.Username,
+		"password": hashPassword(user.Username, user.Password, "crab"),
+	}
+	if err := s.db.QueryRow(ctx, query, args).Scan(&user.Id); err != nil {
+		return nil, &UserNotFoundErr{}
+	}
+	return user, nil
+}
+
 func hashPassword(username string, password string, salt string) string {
 	return getMD5Hash(username + password + salt)
 }