CODEWITHSUNDEEP
sslistiogatewaytls1.3
imriss
imriss

Reputation: 1971

Enovy error - The following ciphers were rejected when tried individually: TLS_AES_128_GCM_SHA256

In istio 1.5.1, when I tried to add a particular cipher suit to the gateway's tls section using this syntax:

      minProtocolVersion: TLSV1_3
      mode: SIMPLE
      cipherSuites: [TLS_AES_128_GCM_SHA256]

I got the following error in the istio-ingress pod's logs:

[Envoy (Epoch 0)] [2020-06-08 15:15:44.033][22][warning][config] [external/envoy/source/common/config/grpc_subscription_impl.cc:87]
gRPC config for type.googleapis.com/envoy.api.v2.Listener rejected: 
Error adding/updating listener(s) 0.0.0.0_443: Failed to initialize cipher suites TLS_AES_128_GCM_SHA256.
The following ciphers were rejected when tried individually: TLS_AES_128_GCM_SHA256

If I remove the cipherSuites line from the tls section, there is no errors, and the same cipher suit appears in the list of valid cipher suits.

Any advise? Thanks

Upvotes: 0

Views: 1329

Answers (1)

Jakub
Jakub

Reputation: 8830

As far as I checked in envoy documentation And BoringSSL documentation

TLS 1.3 ciphers do not participate in this mechanism and instead have a built-in preference order. Functions to set cipher lists do not affect TLS 1.3, and functions to query the cipher list do not include TLS 1.3 ciphers.

cipher_suites

If specified, the TLS listener will only support the specified cipher list when negotiating TLS 1.0-1.2 (this setting has no effect when negotiating TLS 1.3). If not specified, the default list will be used.

In non-FIPS builds, the default cipher list is:

[ECDHE-ECDSA-AES128-GCM-SHA256|ECDHE-ECDSA-CHACHA20-POLY1305]
[ECDHE-RSA-AES128-GCM-SHA256|ECDHE-RSA-CHACHA20-POLY1305]
ECDHE-ECDSA-AES128-SHA
ECDHE-RSA-AES128-SHA
AES128-GCM-SHA256
AES128-SHA
ECDHE-ECDSA-AES256-GCM-SHA384
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-ECDSA-AES256-SHA
ECDHE-RSA-AES256-SHA
AES256-GCM-SHA384
AES256-SHA

In builds using BoringSSL FIPS, the default cipher list is:

ECDHE-ECDSA-AES128-GCM-SHA256
ECDHE-RSA-AES128-GCM-SHA256
ECDHE-ECDSA-AES128-SHA
ECDHE-RSA-AES128-SHA
AES128-GCM-SHA256
AES128-SHA
ECDHE-ECDSA-AES256-GCM-SHA384
ECDHE-RSA-AES256-GCM-SHA384
ECDHE-ECDSA-AES256-SHA
ECDHE-RSA-AES256-SHA
AES256-GCM-SHA384
AES256-SHA

Additionally take a look at this github issue.

Upvotes: 1

Related Questions