Auth service provides authentication features as an API for managing authentication keys. User service is using Auth service gRPC API to obtain login token or password reset token. Authentication key consists of the following fields:
- 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](jwt.io).
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][doc].
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
| MF_AUTH_SERVER_CERT | Path to server certificate in pem format | |
| MF_AUTH_SERVER_KEY | Path to server key in pem format | |
| MF_AUTH_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:
```yaml
version: "3.7"
services:
auth:
image: mainflux/auth:[version]
container_name: [instance name]
ports:
- [host machine port]:[configured HTTP port]
environment:
MF_AUTH_LOG_LEVEL: [Service log level]
MF_AUTH_DB_HOST: [Database host address]
MF_AUTH_DB_PORT: [Database host port]
MF_AUTH_DB_USER: [Database user]
MF_AUTH_DB_PASS: [Database password]
MF_AUTH_DB: [Name of the database used by the service]
MF_AUTH_DB_SSL_MODE: [SSL mode to connect to the database with]
MF_AUTH_DB_SSL_CERT: [Path to the PEM encoded certificate file]
MF_AUTH_DB_SSL_KEY: [Path to the PEM encoded key file]
MF_AUTH_DB_SSL_ROOT_CERT: [Path to the PEM encoded root certificate file]
MF_AUTH_HTTP_PORT: [Service HTTP port]
MF_AUTH_GRPC_PORT: [Service gRPC port]
MF_AUTH_SECRET: [String used for signing tokens]
MF_AUTH_SERVER_CERT: [String path to server certificate in pem format]
MF_AUTH_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:
```bash
# download the latest version of the service
go get github.com/mainflux/mainflux
cd $GOPATH/src/github.com/mainflux/mainflux
# compile the service
make auth
# copy binary to bin
make install
# set the environment variables and run the service
MF_AUTH_LOG_LEVEL=[Service log level] MF_AUTH_DB_HOST=[Database host address] MF_AUTH_DB_PORT=[Database host port] MF_AUTH_DB_USER=[Database user] MF_AUTH_DB_PASS=[Database password] MF_AUTH_DB=[Name of the database used by the service] MF_AUTH_DB_SSL_MODE=[SSL mode to connect to the database with] MF_AUTH_DB_SSL_CERT=[Path to the PEM encoded certificate file] MF_AUTH_DB_SSL_KEY=[Path to the PEM encoded key file] MF_AUTH_DB_SSL_ROOT_CERT=[Path to the PEM encoded root certificate file] MF_AUTH_HTTP_PORT=[Service HTTP port] MF_AUTH_GRPC_PORT=[Service gRPC port] MF_AUTH_SECRET=[String used for signing tokens] MF_AUTH_SERVER_CERT=[Path to server certificate] MF_AUTH_SERVER_KEY=[Path to server key] MF_JAEGER_URL=[Jaeger server URL] $GOBIN/mainflux-auth
```
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
