Keys and Certificates
If you suspect that some of the keys and/or certificates used by Istio aren’t correct, the first step is to ensure that Citadel is healthy.
You can then verify that Citadel is actually generating keys and certificates:
$ kubectl get secret istio.my-sa -n my-ns
NAME TYPE DATA AGE
istio.my-sa istio.io/key-and-cert 3 24d
Where my-ns and my-sa are the namespace and service account your pod is running as.
If you want to check the keys and certificates of other service accounts, you can run the following command to list all secrets for which Citadel has generated a key and certificate:
$ kubectl get secret --all-namespaces | grep istio.io/key-and-cert
NAMESPACE NAME TYPE DATA AGE
.....
istio-system istio.istio-citadel-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-cleanup-old-ca-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-egressgateway-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-ingressgateway-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-mixer-post-install-account istio.io/key-and-cert 3 14d
istio-system istio.istio-mixer-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-pilot-service-account istio.io/key-and-cert 3 14d
istio-system istio.istio-sidecar-injector-service-account istio.io/key-and-cert 3 14d
istio-system istio.prometheus istio.io/key-and-cert 3 14d
kube-public istio.default istio.io/key-and-cert 3 14d
.....
Then check that the certificate is valid with:
$ kubectl get secret -o json istio.my-sa -n my-ns | jq -r '.data["cert-chain.pem"]' | base64 --decode | openssl x509 -noout -text
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
99:59:6b:a2:5a:f4:20:f4:03:d7:f0:bc:59:f5:d8:40
Signature Algorithm: sha256WithRSAEncryption
Issuer: O = k8s.cluster.local
Validity
Not Before: Jun 4 20:38:20 2018 GMT
Not After : Sep 2 20:38:20 2018 GMT
Subject: O =
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:c8:a0:08:24:61:af:c1:cb:81:21:90:cc:03:76:
01:25:bc:ff:ca:25:fc:81:d1:fa:b8:04:aa:d4:6b:
55:e9:48:f2:e4:ab:22:78:03:47:26:bb:8f:22:10:
66:47:47:c3:b2:9a:70:f1:12:f1:b3:de:d0:e9:2d:
28:52:21:4b:04:33:fa:3d:92:8c:ab:7f:cc:74:c9:
c4:68:86:b0:4f:03:1b:06:33:48:e3:5b:8f:01:48:
6a:be:64:0e:01:f5:98:6f:57:e4:e7:b7:47:20:55:
98:35:f9:99:54:cf:a9:58:1e:1b:5a:0a:63:ce:cd:
ed:d3:a4:88:2b:00:ee:b0:af:e8:09:f8:a8:36:b8:
55:32:80:21:8e:b5:19:c0:2f:e8:ca:4b:65:35:37:
2f:f1:9e:6f:09:d4:e0:b1:3d:aa:5f:fe:25:1a:7b:
d4:dd:fe:d1:d3:b6:3c:78:1d:3b:12:c2:66:bd:95:
a8:3b:64:19:c0:51:05:9f:74:3d:6e:86:1e:20:f5:
ed:3a:ab:44:8d:7c:5b:11:14:83:ee:6b:a1:12:2e:
2a:0e:6b:be:02:ad:11:6a:ec:23:fe:55:d9:54:f3:
5c:20:bc:ec:bf:a6:99:9b:7a:2e:71:10:92:51:a7:
cb:79:af:b4:12:4e:26:03:ab:35:e2:5b:00:45:54:
fe:91
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Subject Alternative Name:
URI:spiffe://cluster.local/ns/my-ns/sa/my-sa
Signature Algorithm: sha256WithRSAEncryption
78:77:7f:83:cc:fc:f4:30:12:57:78:62:e9:e2:48:d6:ea:76:
69:99:02:e9:62:d2:53:db:2c:13:fe:0f:00:56:2b:83:ca:d3:
4c:d2:01:f6:08:af:01:f2:e2:3e:bb:af:a3:bf:95:97:aa:de:
1e:e6:51:8c:21:ee:52:f0:d3:af:9c:fd:f7:f9:59:16:da:40:
4d:53:db:47:bb:9c:25:1a:6e:34:41:42:d9:26:f7:3a:a6:90:
2d:82:42:97:08:f4:6b:16:84:d1:ad:e3:82:2c:ce:1c:d6:cd:
68:e6:b0:5e:b5:63:55:3e:f1:ff:e1:a0:42:cd:88:25:56:f7:
a8:88:a1:ec:53:f9:c1:2a:bb:5c:d7:f8:cb:0e:d9:f4:af:2e:
eb:85:60:89:b3:d0:32:60:b4:a8:a1:ee:f3:3a:61:60:11:da:
2d:7f:2d:35:ce:6e:d4:eb:5c:82:cf:5c:9a:02:c0:31:33:35:
51:2b:91:79:8a:92:50:d9:e0:58:0a:78:9d:59:f4:d3:39:21:
bb:b4:41:f9:f7:ec:ad:dd:76:be:28:58:c0:1f:e8:26:5a:9e:
7b:7f:14:a9:18:8d:61:d1:06:e3:9e:0f:05:9e:1b:66:0c:66:
d1:27:13:6d:ab:59:46:00:77:6e:25:f6:e8:41:ef:49:58:73:
b4:93:04:46
Make sure the displayed certificate contains valid information. In particular, the Subject Alternative Name field should be URI:spiffe://cluster.local/ns/my-ns/sa/my-sa.
If this is not the case, it is likely that something is wrong with your Citadel. Try to redeploy Citadel and check again.
Finally, you can verify that the key and certificate are correctly mounted by your sidecar proxy at the directory /etc/certs. You
can use this command to check:
$ kubectl exec -it my-pod-id -c istio-proxy -- ls /etc/certs
cert-chain.pem key.pem root-cert.pem
Optionally, you could use the following command to check its contents:
$ kubectl exec -it my-pod-id -c istio-proxy -- cat /etc/certs/cert-chain.pem | openssl x509 -text -noout
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
7e:b4:44:fe:d0:46:ba:27:47:5a:50:c8:f0:8e:8b:da
Signature Algorithm: sha256WithRSAEncryption
Issuer: O = k8s.cluster.local
Validity
Not Before: Jul 13 01:23:13 2018 GMT
Not After : Oct 11 01:23:13 2018 GMT
Subject: O =
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:bb:c9:cd:f4:b8:b5:e4:3b:f2:35:aa:4c:67:cc:
1b:a9:30:c4:b7:fd:0a:f5:ac:94:05:b5:82:96:b2:
c8:98:85:f9:fc:09:b3:28:34:5e:79:7e:a9:3c:58:
0a:14:43:c1:f4:d7:b8:76:ab:4e:1c:89:26:e8:55:
cd:13:6b:45:e9:f1:67:e1:9b:69:46:b4:7e:8c:aa:
fd:70:de:21:15:4f:f5:f3:0f:b7:d4:c6:b5:9d:56:
ef:8a:91:d7:16:fa:db:6e:4c:24:71:1c:9c:f3:d9:
4b:83:f1:dd:98:5b:63:5c:98:5e:2f:15:29:0f:78:
31:04:bc:1d:c8:78:c3:53:4f:26:b2:61:86:53:39:
0a:3b:72:3e:3d:0d:22:61:d6:16:72:5d:64:e3:78:
c8:23:9d:73:17:07:5a:6b:79:75:91:ce:71:4b:77:
c5:1f:60:f1:da:ca:aa:85:56:5c:13:90:23:02:20:
12:66:3f:8f:58:b8:aa:72:9d:36:f1:f3:b7:2b:2d:
3e:bb:7c:f9:b5:44:b9:57:cf:fc:2f:4b:3c:e6:ee:
51:ba:23:be:09:7b:e2:02:6a:6e:e7:83:06:cd:6c:
be:7a:90:f1:1f:2c:6d:12:9e:2f:0f:e4:8c:5f:31:
b1:a2:fa:0b:71:fa:e1:6a:4a:0f:52:16:b4:11:73:
65:d9
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Subject Alternative Name:
URI:spiffe://cluster.local/ns/default/sa/bookinfo-productpage
Signature Algorithm: sha256WithRSAEncryption
8f:be:af:a4:ee:f7:be:21:e9:c8:c9:e2:3b:d3:ac:41:18:5d:
f8:9a:85:0f:98:f3:35:af:b7:e1:2d:58:5a:e0:50:70:98:cc:
75:f6:2e:55:25:ed:66:e7:a4:b9:4a:aa:23:3b:a6:ee:86:63:
9f:d8:f9:97:73:07:10:25:59:cc:d9:01:09:12:f9:ab:9e:54:
24:8a:29:38:74:3a:98:40:87:67:e4:96:d0:e6:c7:2d:59:3d:
d3:ea:dd:6e:40:5f:63:bf:30:60:c1:85:16:83:66:66:0b:6a:
f5:ab:60:7e:f5:3b:44:c6:11:5b:a1:99:0c:bd:53:b3:a7:cc:
e2:4b:bd:10:eb:fb:f0:b0:e5:42:a4:b2:ab:0c:27:c8:c1:4c:
5b:b5:1b:93:25:9a:09:45:7c:28:31:13:a3:57:1c:63:86:5a:
55:ed:14:29:db:81:e3:34:47:14:ba:52:d6:3c:3d:3b:51:50:
89:a9:db:17:e4:c4:57:ec:f8:22:98:b7:e7:aa:8a:72:28:9a:
a7:27:75:60:85:20:17:1d:30:df:78:40:74:ea:bc:ce:7b:e5:
a5:57:32:da:6d:f2:64:fb:28:94:7d:28:37:6f:3c:97:0e:9c:
0c:33:42:f0:b6:f5:1c:0d:fb:70:65:aa:93:3e:ca:0e:58:ec:
8e:d5:d0:1e