Security Problems
End-user authentication fails
With Istio, you can enable authentication for end users through request authentication policies. Follow these steps to troubleshoot the policy specification.
If
jwksUriisn’t set, make sure the JWT issuer is of url format andurl + /.well-known/openid-configurationcan be opened in browser; for example, if the JWT issuer ishttps://accounts.google.com, make surehttps://accounts.google.com/.well-known/openid-configurationis a valid url and can be opened in a browser.apiVersion: "security.istio.io/v1beta1" kind: "RequestAuthentication" metadata: name: "example-3" spec: selector: matchLabels: app: httpbin jwtRules: - issuer: "testing@secure.istio.io" jwksUri: "https://raw.githubusercontent.com/istio/istio/release-1.5/security/tools/jwt/samples/jwks.json"If the JWT token is placed in the Authorization header in http requests, make sure the JWT token is valid (not expired, etc). The fields in a JWT token can be decoded by using online JWT parsing tools, e.g., jwt.io.
Verify the Envoy proxy configuration of the target workload using
istioctl proxy-configcommand.With the example policy above applied, use the following command to check the
listenerconfiguration on the inbound port80. You should seeenvoy.filters.http.jwt_authnfilter with settings matching the issuer and JWKS as specified in the policy.$ POD=$(kubectl get pod -l app=httpbin -n foo -o jsonpath={.items..metadata.name}) $ istioctl proxy-config listener ${POD} -n foo --port 80 --type HTTP -o json <redacted> { "name": "envoy.filters.http.jwt_authn", "typedConfig": { "@type": "type.googleapis.com/envoy.config.filter.http.jwt_authn.v2alpha.JwtAuthentication", "providers": { "origins-0": { "issuer": "testing@secure.istio.io", "localJwks": { "inlineString": "*redacted*" }, "payloadInMetadata": "testing@secure.istio.io" } }, "rules": [ { "match": { "prefix": "/" }, "requires": { "requiresAny": { "requirements": [ { "providerName": "origins-0" }, { "allowMissing": {} } ] } } } ] } }, <redacted>
Authorization is too restrictive
When you first enable authorization for a service, all requests are denied by default. After you add one or more authorization policies, then matching requests should flow through. If all requests continue to be denied, you can try the following:
Make sure there is no typo in your policy YAML file.
Avoid enabling authorization for Istiod. Istio authorization policy is designed for authorizing access to workloads in Istio Mesh. Enabling it for Istiod may cause unexpected behavior.
Make sure that your authorization policies are in the right namespace (as specified in
metadata/namespacefield).Make sure that your authorization policies with ALLOW action don’t use any HTTP only fields for TCP traffic. Otherwise, Istio ignores the ALLOW policies as if they don’t exist.
Make sure that your authorization policies with DENY action don’t use any HTTP only fields for TCP traffic. Otherwise, Istio ignores the rules with HTTP only fields within the DENY policies as if they don’t exist.
Authorization is too permissive
If authorization checks are enabled for a service and yet requests to the service aren’t being blocked, then authorization was likely not enabled successfully. To verify, follow these steps:
Check the authorization concept documentation to correctly apply Istio authorization.
Make sure there is no typo in your policy YAML file. Especially check to make sure the authorization policy is applied to the right workload and namespace.
Avoid enabling authorization for istiod. The Istio authorization features are designed for authorizing access to workloads in an Istio Mesh. Enabling the authorization features for istiod can cause unexpected behavior.
Ensure Istiod accepts the policies
Istiod converts and distributes your authorization policies to the proxies. The following steps help you ensure Istiod is working as expected:
Run the following command to export the Istiod
ControlZ:$ kubectl port-forward $(kubectl -n istio-system get pods -l app=istiod -o jsonpath='{.items[0].metadata.name}') -n istio-system 9876:9876Verify you see the following output:
Forwarding from 127.0.0.1:9876 -> 9876Start your browser and open the
ControlZpage athttp://127.0.0.1:9876/scopez/.Change the
rbacOutput Level todebug.Use
Ctrl+Cin the terminal you started in step 1 to stop the port-forward command.Print the log of Istiod and search for
rbacwith the following command:$ kubectl logs $(kubectl -n istio-system get pods -l app=istiod -o jsonpath='{.items[0].metadata.name}') -c discovery -n istio-system | grep rbacCheck the output and verify:
- There are no errors.
- There is a
building v1beta1 policymessage which indicates the filter was generated for the target workload.
For example, you might see something similar to the following:
2020-03-05T23:43:21.621339Z debug rbac found authorization allow policies for workload [app=ext-authz-server,pod-template-hash=5fd587cc9d,security.istio.io/tlsMode=istio,service.istio.io/canonical-name=ext-authz-server,service.istio.io/canonical-revision=latest] in foo 2020-03-05T23:43:21.621348Z debug rbac building filter for HTTP listener protocol 2020-03-05T23:43:21.621351Z debug rbac building v1beta1 policy 2020-03-05T23:43:21.621399Z debug rbac constructed internal model: &{Permissions:[{Services:[] Hosts:[] NotHosts:[] Paths:[] NotPaths:[] Methods:[] NotMethods:[] Ports:[] NotPorts:[] Constraints:[] AllowAll:true v1beta1:true}] Principals:[{Users:[] Names:[cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account] NotNames:[] Group: Groups:[] NotGroups:[] Namespaces:[] NotNamespaces:[] IPs:[] NotIPs:[] RequestPrincipals:[] NotRequestPrincipals:[] Properties:[] AllowAll:false v1beta1:true}]} 2020-03-05T23:43:21.621528Z info ads LDS: PUSH for node:sleep-6bdb595bcb-vmchz.foo listeners:38 2020-03-05T23:43:21.621997Z debug rbac generated policy ns[foo]-policy[ext-authz-server]-rule[0]: permissions:<and_rules:<rules:<any:true > > > principals:<and_ids:<ids:<or_ids:<ids:<metadata:<filter:"istio_authn" path:<key:"source.principal" > value:<string_match:<exact:"cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account" > > > > > > > > 2020-03-05T23:43:21.622052Z debug rbac added HTTP filter to filter chain 0 2020-03-05T23:43:21.623532Z debug rbac found authorization allow policies for workload [app=ext-authz-server,pod-template-hash=5fd587cc9d,security.istio.io/tlsMode=istio,service.istio.io/canonical-name=ext-authz-server,service.istio.io/canonical-revision=latest] in foo 2020-03-05T23:43:21.623543Z debug rbac building filter for TCP listener protocol 2020-03-05T23:43:21.623546Z debug rbac building v1beta1 policy 2020-03-05T23:43:21.623572Z debug rbac constructed internal model: &{Permissions:[{Services:[] Hosts:[] NotHosts:[] Paths:[] NotPaths:[] Methods:[] NotMethods:[] Ports:[] NotPorts:[] Constraints:[] AllowAll:true v1beta1:true}] Principals:[{Users:[] Names:[cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account] NotNames:[] Group: Groups:[] NotGroups:[] Namespaces:[] NotNamespaces:[] IPs:[] NotIPs:[] RequestPrincipals:[] NotRequestPrincipals:[] Properties:[] AllowAll:false v1beta1:true}]} 2020-03-05T23:43:21.623625Z debug rbac generated policy ns[foo]-policy[ext-authz-server]-rule[0]: permissions:<and_rules:<rules:<any:true > > > principals:<and_ids:<ids:<or_ids:<ids:<authenticated:<principal_name:<exact:"spiffe://cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account" > > > > > > > 2020-03-05T23:43:21.623645Z debug rbac added TCP filter to filter chain 0 2020-03-05T23:43:21.623648Z debug rbac added TCP filter to filter chain 1This shows that Istiod generated:
An HTTP filter config with policy
ns[foo]-policy[ext-authz-server]-rule[0]for workload with labelsapp=ext-authz-server,....A TCP filter config with policy
ns[foo]-policy[ext-authz-server]-rule[0]for workload with labelsapp=ext-authz-server,....
Ensure Istiod distributes policies to proxies correctly
Pilot distributes the authorization policies to proxies. The following steps help you ensure Pilot is working as expected:
Run the following command to get the proxy configuration dump for the
productpageservice:$ kubectl exec $(kubectl get pods -l app=productpage -o jsonpath='{.items[0].metadata.name}') -c istio-proxy -- pilot-agent request GET config_dumpCheck the log and verify:
- The log includes an
envoy.filters.http.rbacfilter to enforce the authorization policy on each incoming request. - Istio updates the filter accordingly after you update your authorization policy.
- The log includes an
The following output means the proxy of
productpagehas enabled theenvoy.filters.http.rbacfilter with rules that allows anyone to access it viaGETmethod. Theshadow_rulesare not used and you can ignored them safely.{ "name": "envoy.filters.http.rbac", "config": { "rules": { "policies": { "productpage-viewer": { "permissions": [ { "and_rules": { "rules": [ { "or_rules": { "rules": [ { "header": { "exact_match": "GET", "name": ":method" } } ] } } ] } } ], "principals": [ { "and_ids": { "ids": [ { "any": true } ] } } ] } } }, "shadow_rules": { "policies": {} } } },
Ensure proxies enforce policies correctly
Proxies eventually enforce the authorization policies. The following steps help you ensure the proxy is working as expected:
Turn on the authorization debug logging in proxy with the following command:
$ kubectl exec $(kubectl get pods -l app=productpage -o jsonpath='{.items[0].metadata.name}') -c istio-proxy -- pilot-agent request POST 'logging?rbac=debug'Verify you see the following output:
active loggers: ... ... rbac: debug ... ...Visit the
productpagein your browser to generate some logs.Print the proxy logs with the following command:
$ kubectl logs $(kubectl get pods -l app=productpage -o jsonpath='{.items[0].metadata.name}') -c istio-proxyCheck the output and verify:
The output log shows either
enforced allowedorenforced denieddepending on whether the request was allowed or denied respectively.Your authorization policy expects the data extracted from the request.
The following output means there is a
GETrequest at path/productpageand the policy allows the request. Theshadow deniedhas no effect and you can ignore it safely.... [2018-07-26 20:39:18.060][152][debug][rbac] external/envoy/source/extensions/filters/http/rbac/rbac_filter.cc:79] checking request: remoteAddress: 10.60.0.139:51158, localAddress: 10.60.0.93:9080, ssl: uriSanPeerCertificate: spiffe://cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account, subjectPeerCertificate: O=, headers: ':authority', '35.238.0.62' ':path', '/productpage' ':method', 'GET' 'upgrade-insecure-requests', '1' 'user-agent', 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36' 'dnt', '1' 'accept', 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8' 'accept-encoding', 'gzip, deflate' 'accept-language', 'en-US,en;q=0.9,zh-CN;q=0.8,zh;q=0.7' 'x-forwarded-for', '10.60.0.1' 'x-forwarded-proto', 'http' 'x-request-id', 'e23ea62d-b25d-91be-857c-80a058d746d4' 'x-b3-traceid', '5983108bf6d05603' 'x-b3-spanid', '5983108bf6d05603' 'x-b3-sampled', '1' 'x-istio-attributes', 'CikKGGRlc3RpbmF0aW9uLnNlcnZpY2UubmFtZRINEgtwcm9kdWN0cGFnZQoqCh1kZXN0aW5hdGlvbi5zZXJ2aWNlLm5hbWVzcGFjZRIJEgdkZWZhdWx0Ck8KCnNvdXJjZS51aWQSQRI/a3ViZXJuZXRlczovL2lzdGlvLWluZ3Jlc3NnYXRld2F5LTc2NjY0Y2NmY2Ytd3hjcjQuaXN0aW8tc3lzdGVtCj4KE2Rlc3RpbmF0aW9uLnNlcnZpY2USJxIlcHJvZHVjdHBhZ2UuZGVmYXVsdC5zdmMuY2x1c3Rlci5sb2NhbApDChhkZXN0aW5hdGlvbi5zZXJ2aWNlLmhvc3QSJxIlcHJvZHVjdHBhZ2UuZGVmYXVsdC5zdmMuY2x1c3Rlci5sb2NhbApBChdkZXN0aW5hdGlvbi5zZXJ2aWNlLnVpZBImEiRpc3RpbzovL2RlZmF1bHQvc2VydmljZXMvcHJvZHVjdHBhZ2U=' 'content-length', '0' 'x-envoy-internal', 'true' 'sec-istio-authn-payload', 'CkVjbHVzdGVyLmxvY2FsL25zL2lzdGlvLXN5c3RlbS9zYS9pc3Rpby1pbmdyZXNzZ2F0ZXdheS1zZXJ2aWNlLWFjY291bnQSRWNsdXN0ZXIubG9jYWwvbnMvaXN0aW8tc3lzdGVtL3NhL2lzdGlvLWluZ3Jlc3NnYXRld2F5LXNlcnZpY2UtYWNjb3VudA==' , dynamicMetadata: filter_metadata { key: "istio_authn" value { fields { key: "request.auth.principal" value { string_value: "cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account" } } fields { key: "source.principal" value { string_value: "cluster.local/ns/istio-system/sa/istio-ingressgateway-service-account" } } } } [2018-07-26 20:39:18.060][152][debug][rbac] external/envoy/source/extensions/filters/http/rbac/rbac_filter.cc:88] shadow denied [2018-07-26 20:39:18.060][152][debug][rbac] external/envoy/source/extensions/filters/http/rbac/rbac_filter.cc:98] enforced allowed ...
Keys and certificates errors
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
Mutual TLS errors
If you suspect problems with mutual TLS, first ensure that Citadel is healthy, and second ensure that keys and certificates are being delivered to sidecars properly.
If everything appears to be working so far, the next step is to verify that the right authentication policy is applied and the right destination rules are in place.
Citadel is not behaving properly
Citadel is not a critical data plane component. The default workload certificate lifetime is 3 months. Certificates will be rotated by Citadel before they expire. If Citadel is disabled for short maintenance periods, existing mutual TLS traffic will not be affected.
If you suspect Citadel isn’t working properly, verify the status of the istio-citadel pod:
$ kubectl get pod -l istio=citadel -n istio-system
NAME READY STATUS RESTARTS AGE
istio-citadel-ff5696f6f-ht4gq 1/1 Running 0 25d
If the istio-citadel pod doesn’t exist, try to re-deploy the pod.
If the istio-citadel pod is present but its status is not Running, run the commands below to get more
debugging information and check if there are any errors:
$ kubectl logs -l istio=citadel -n istio-system
$ kubectl describe pod -l istio=citadel -n istio-system
If you want to check a workload (with default service account and default namespace)
certificate’s lifetime:
$ kubectl get secret -o json istio.default -n default | jq -r '.data["cert-chain.pem"]' | base64 --decode | openssl x509 -noout -text | grep "Not After" -C 1
Not Before: Jun 1 18:23:30 2019 GMT
Not After : Aug 30 18:23:30 2019 GMT
Subject: