Mainflux.mainflux/authn

Authentication service

Authentication service provides an API for managing authentication keys. User service is using AuthN service gRPC API to obtain login token or password reset token. Authentication key consists of the following fields:

• ID - key ID
• Type - one of the three types described below
• IssuerID - an ID of the Mainflux User who issued the key
• Subject - user email
• IssuedAt - the timestamp when the key is issued
• ExpiresAt - the timestamp after which the key is invalid

There are three types of authentication keys:

• User key - keys issued to the user upon login request
• API key - keys issued upon the user request
• Recovery key - password recovery key

Authentication keys are represented and distributed by the corresponding JWT.

User keys are issued when user logs in. Each user request (other than registration and login) contains user key that is used to authenticate the user.

API keys are similar to the User keys. The main difference is that API keys have configurable expiration time. If no time is set, the key will never expire. For that reason, API keys are the only key type that can be revoked. This also means that, despite being used as a JWT, it requires a query to the database to validate the API key. The user with API key can perform all the same actions as the user with login key (can act on behalf of the user for Thing, Channel, or user profile management), except issuing new API keys.

Recovery key is the password recovery key. It's short-lived token used for password recovery process.

For in-depth explanation of the aforementioned scenarios, as well as thorough understanding of Mainflux, please check out the official documentation.

The following actions are supported:

• create (all key types)
• verify (all key types)
• obtain (API keys only)
• revoke (API keys only)

Configuration

The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.

Variable	Description	Default
MF_AUTHN_LOG_LEVEL	Service level (debug, info, warn, error)	error
MF_AUTHN_DB_HOST	Database host address	localhost
MF_AUTHN_DB_PORT	Database host port	5432
MF_AUTHN_DB_USER	Database user	mainflux
MF_AUTHN_DB_PASSWORD	Database password	mainflux
MF_AUTHN_DB	Name of the database used by the service	auth
MF_AUTHN_DB_SSL_MODE	Database connection SSL mode (disable, require, verify-ca, verify-full)	disable
MF_AUTHN_DB_SSL_CERT	Path to the PEM encoded certificate file
MF_AUTHN_DB_SSL_KEY	Path to the PEM encoded key file
MF_AUTHN_DB_SSL_ROOT_CERT	Path to the PEM encoded root certificate file
MF_AUTHN_HTTP_PORT	Authn service HTTP port	8180
MF_AUTHN_GRPC_PORT	Authn service gRPC port	8181
MF_AUTHN_SERVER_CERT	Path to server certificate in pem format
MF_AUTHN_SERVER_KEY	Path to server key in pem format
MF_AUTHN_SECRET	String used for signing tokens	auth
MF_JAEGER_URL	Jaeger server URL	localhost:6831

Deployment

The service itself is distributed as Docker container. The following snippet provides a compose file template that can be used to deploy the service container locally:

version: "2"
services:
  authn:
    image: mainflux/authn:[version]
    container_name: [instance name]
    ports:
      - [host machine port]:[configured HTTP port]
    environment:
      MF_AUTHN_LOG_LEVEL: [Service log level]
      MF_AUTHN_DB_HOST: [Database host address]
      MF_AUTHN_DB_PORT: [Database host port]
      MF_AUTHN_DB_USER: [Database user]
      MF_AUTHN_DB_PASS: [Database password]
      MF_AUTHN_DB: [Name of the database used by the service]
      MF_AUTHN_DB_SSL_MODE: [SSL mode to connect to the database with]
      MF_AUTHN_DB_SSL_CERT: [Path to the PEM encoded certificate file]
      MF_AUTHN_DB_SSL_KEY: [Path to the PEM encoded key file]
      MF_AUTHN_DB_SSL_ROOT_CERT: [Path to the PEM encoded root certificate file]
      MF_AUTHN_HTTP_PORT: [Service HTTP port]
      MF_AUTHN_GRPC_PORT: [Service gRPC port]
      MF_AUTHN_SECRET: [String used for signing tokens]
      MF_AUTHN_SERVER_CERT: [String path to server certificate in pem format]
      MF_AUTHN_SERVER_KEY: [String path to server key in pem format]
      MF_JAEGER_URL: [Jaeger server URL]

To start the service outside of the container, execute the following shell script:

# download the latest version of the service
go get github.com/mainflux/mainflux

cd $GOPATH/src/github.com/mainflux/mainflux

# compile the service
make authn

# copy binary to bin
make install

# set the environment variables and run the service
MF_AUTHN_LOG_LEVEL=[Service log level] MF_AUTHN_DB_HOST=[Database host address] MF_AUTHN_DB_PORT=[Database host port] MF_AUTHN_DB_USER=[Database user] MF_AUTHN_DB_PASS=[Database password] MF_AUTHN_DB=[Name of the database used by the service] MF_AUTHN_DB_SSL_MODE=[SSL mode to connect to the database with] MF_AUTHN_DB_SSL_CERT=[Path to the PEM encoded certificate file] MF_AUTHN_DB_SSL_KEY=[Path to the PEM encoded key file] MF_AUTHN_DB_SSL_ROOT_CERT=[Path to the PEM encoded root certificate file] MF_AUTHN_HTTP_PORT=[Service HTTP port] MF_AUTHN_GRPC_PORT=[Service gRPC port] MF_AUTHN_SECRET=[String used for signing tokens] MF_AUTHN_SERVER_CERT=[Path to server certificate] MF_AUTHN_SERVER_KEY=[Path to server key] MF_JAEGER_URL=[Jaeger server URL] $GOBIN/mainflux-authn

If MF_EMAIL_TEMPLATE doesn't point to any file service will function but password reset functionality will not work.

Usage

For more information about service capabilities and its usage, please check out the API documentation.