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This commit adds jwt token support in v3 auth API. Remaining major ToDos: - Currently token type isn't hidden from etcdserver. In the near future the information should be completely invisible from etcdserver package. - Configurable expiration of token. Currently tokens can be valid until keys are changed. How to use: 1. generate keys for signing and verfying jwt tokens: $ openssl genrsa -out app.rsa 1024 $ openssl rsa -in app.rsa -pubout > app.rsa.pub 2. add command line options to etcd like below: --auth-token-type jwt \ --auth-jwt-pub-key app.rsa.pub --auth-jwt-priv-key app.rsa \ --auth-jwt-sign-method RS512 3. launch etcd cluster Below is a performance comparison of serializable read w/ and w/o jwt token. Every (3) etcd node is executed on a single machine. Signing method is RS512 and key length is 1024 bit. As the results show, jwt based token introduces a performance overhead but it would be acceptable for a case that requires authentication. w/o jwt token auth (no auth): Summary: Total: 1.6172 secs. Slowest: 0.0125 secs. Fastest: 0.0001 secs. Average: 0.0002 secs. Stddev: 0.0004 secs. Requests/sec: 6183.5877 Response time histogram: 0.000 [1] | 0.001 [9982] |∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 0.003 [1] | 0.004 [1] | 0.005 [0] | 0.006 [0] | 0.008 [6] | 0.009 [0] | 0.010 [1] | 0.011 [5] | 0.013 [3] | Latency distribution: 10% in 0.0001 secs. 25% in 0.0001 secs. 50% in 0.0001 secs. 75% in 0.0001 secs. 90% in 0.0002 secs. 95% in 0.0002 secs. 99% in 0.0003 secs. w/ jwt token auth: Summary: Total: 2.5364 secs. Slowest: 0.0182 secs. Fastest: 0.0002 secs. Average: 0.0003 secs. Stddev: 0.0005 secs. Requests/sec: 3942.5185 Response time histogram: 0.000 [1] | 0.002 [9975] |∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ 0.004 [0] | 0.006 [1] | 0.007 [11] | 0.009 [2] | 0.011 [4] | 0.013 [5] | 0.015 [0] | 0.016 [0] | 0.018 [1] | Latency distribution: 10% in 0.0002 secs. 25% in 0.0002 secs. 50% in 0.0002 secs. 75% in 0.0002 secs. 90% in 0.0003 secs. 95% in 0.0003 secs. 99% in 0.0004 secs.