Authentication using tokens based on JSON Web Tokens
Pulsar supports authenticating clients using security tokens based on JSON Web Tokens (RFC-7519), including all the algorithms that the Java JWT library supports.
A token is a credential associated with a user. The association is done through a "principal" or "role". In the case of JWT tokens, it typically refers to a subject. You can use a token to identify a Pulsar client and associate it with a subject that is permitted to do specific actions, such as publish messages to a topic or consume messages from a topic. An alternative is to pass a "token supplier" (a function that returns the token when the client library needs one).
The application specifies the token when you create the client instance. The user typically gets the token string from the administrator. The compact representation of a signed JWT is a string that looks like the following:
eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY
Always use TLS encryption when connecting to the Pulsar service, because sending a token is equivalent to sending a password over the wire.
Create client certificates​
JWT authentication supports two different kinds of keys to generate and validate the tokens:
- Symmetric: A single secret key.
- Asymmetric: A key pair, including:
- a private key to generate tokens.
- a public key to validate tokens.
Create a secret key​
The administrators create the secret key and use it to generate the client tokens. You can also configure this key for brokers to validate the clients.
The output file is generated in the root of your Pulsar installation directory. You can also provide an absolute path for the output file using the command below.
bin/pulsar tokens create-secret-key --output my-secret.key
To generate a base64-encoded private key, enter the following command.
bin/pulsar tokens create-secret-key --output /opt/my-secret.key --base64
Create a key pair​
To use asymmetric key encryption, you need to create a pair of keys. The output file is generated in the root of your Pulsar installation directory. You can also provide an absolute path for the output file using the command below.
bin/pulsar tokens create-key-pair --output-private-key my-private.key --output-public-key my-public.key
- Store
my-private.key
in a safe location and only the administrators can use this private key to generate new tokens. - The public key file
my-public.key
is distributed to all Pulsar brokers. You can publicly share it without any security concerns.
Generate tokens​
-
Use this command to require the generated token to have a subject fieldset. This command prints the token string on
stdout
.bin/pulsar tokens create --secret-key file:///path/to/my-secret.key \
--subject test-user -
Create a token by passing the "private" key using the command below:
bin/pulsar tokens create --private-key file:///path/to/my-private.key \
--subject test-user -
Create a token with a pre-defined TTL. Then the token is automatically invalidated.
bin/pulsar tokens create --secret-key file:///path/to/my-secret.key \
--subject test-user \
--expiry-time 1y
The token itself does not have any permission associated. You need to enable authorization and assign superusers, and use the bin/pulsar-admin namespaces grant-permission
command to grant permissions to the token.
Enable JWT authentication on brokers/proxies​
To configure brokers/proxies to authenticate clients using JWT, add the following parameters to the conf/broker.conf
and the conf/proxy.conf
file. If you use a standalone Pulsar, you need to add these parameters to the conf/standalone.conf
file:
# Configuration to enable authentication
authenticationEnabled=true
authenticationProviders=org.apache.pulsar.broker.authentication.AuthenticationProviderToken
# Authentication settings of the broker itself. Used when the broker connects to other brokers, or when the proxy connects to brokers, either in same or other clusters
brokerClientAuthenticationPlugin=org.apache.pulsar.client.impl.auth.AuthenticationToken
brokerClientAuthenticationParameters={"token":"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ0ZXN0LXVzZXIifQ.9OHgE9ZUDeBTZs7nSMEFIuGNEX18FLR3qvy8mqxSxXw"}
# Either configure the token string or specify to read it from a file. The following three available formats are all valid:
# brokerClientAuthenticationParameters={"token":"your-token-string"}
# brokerClientAuthenticationParameters=token:your-token-string
# brokerClientAuthenticationParameters=file:///path/to/token
# If using secret key (Note: key files must be DER-encoded)
tokenSecretKey=file:///path/to/secret.key
# The key can also be passed inline:
# tokenSecretKey=data:;base64,FLFyW0oLJ2Fi22KKCm21J18mbAdztfSHN/lAT5ucEKU=
# If using public/private (Note: key files must be DER-encoded)
# tokenPublicKey=file:///path/to/public.key
Configure JWT authentication in CLI Tools​
Command-line tools like pulsar-admin
, pulsar-perf
, and pulsar-client
use the conf/client.conf
config file in a Pulsar installation.
You need to add the following parameters to the conf/client.conf
config file to use the JWT authentication with CLI tools of Pulsar:
webServiceUrl=https://broker.example.com:8443/
brokerServiceUrl=pulsar://broker.example.com:6650/
authPlugin=org.apache.pulsar.client.impl.auth.AuthenticationToken
authParams=token:eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY
The token string can also be read from a file, for example:
authParams=file:///path/to/token/file
Configure JWT authentication in Pulsar clients​
You can use tokens to authenticate the following Pulsar clients.
- Java
- Python
- Go
- C++
- C#
PulsarClient client = PulsarClient.builder()
.serviceUrl("pulsar://broker.example.com:6650/")
.authentication(
AuthenticationFactory.token("eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"))
.build();
Similarly, you can also pass a Supplier
:
PulsarClient client = PulsarClient.builder()
.serviceUrl("pulsar://broker.example.com:6650/")
.authentication(
AuthenticationFactory.token(() -> {
// Read token from custom source
return readToken();
}))
.build();
from pulsar import Client, AuthenticationToken
client = Client('pulsar://broker.example.com:6650/',
authentication=AuthenticationToken('eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY'))
Alternatively, you can also pass a Supplier
:
def read_token():
with open('/path/to/token.txt') as tf:
return tf.read().strip()
client = Client('pulsar://broker.example.com:6650/',
authentication=AuthenticationToken(read_token))
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: "pulsar://localhost:6650",
Authentication: NewAuthenticationToken("eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"),
})
Similarly, you can also pass a Supplier
:
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: "pulsar://localhost:6650",
Authentication: pulsar.NewAuthenticationTokenSupplier(func () string {
// Read token from custom source
return readToken()
}),
})
#include <pulsar/Client.h>
pulsar::ClientConfiguration config;
config.setAuth(pulsar::AuthToken::createWithToken("eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"));
pulsar::Client client("pulsar://broker.example.com:6650/", config);
var client = PulsarClient.Builder()
.AuthenticateUsingToken("eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY")
.Build();