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authentication - 无法让 kubectl 对 dex 和 gangway 进行身份验证

问题描述

我在 centos7 上运行 kubernetes 1.16.2 的本地实例。我已经安装了 cert-manager、dex 和 gangway 并且显然可以正常工作。我遇到的问题是kubectl。

所以我有dex在它自己的入口上运行，在它的后端使用letsencrypt证书和ldap到我们的本地authn。并且舷梯配置为使用此 dex 实例。

我收集了一个letsencrypt.pem CA

curl https://letsencrypt.org/certs/isrgrootx1.pem.txt > isrgrootx1.pem.txt
curl https://letsencrypt.org/certs/lets-encrypt-x3-cross-signed.pem.txt > lets-encrypt-x3-cross-signed.pem.txt
cat isrgrootx1.pem.txt lets-encrypt-x3-cross-signed.pem.txt > /etc/pki/ca-trust/source/anchors/letsencrypt.pem

dex，配置了这些额外的 nginx 入口注解，

cert-manager.io/cluster-issuer: letsencrypt-prod
nginx.ingress.kubernetes.io/backend-protocol: HTTPS
nginx.ingress.kubernetes.io/force-ssl-redirect: "true"

似乎工作正常：

$ curl -v -L --cacert /etc/pki/ca-trust/source/anchors/letsencrypt.pem   https://dex.mydomain.com/.well-known/openid-configuration
* About to connect() to dex.mydomain.com port 443 (#0)
*   Trying x.y.z.a...
* Connected to dex.mydomain.com (x.y.z.a) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/ca-trust/source/anchors/letsencrypt.pem
  CApath: none
* SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
* Server certificate:
*   subject: CN=dex.mydomain.com
*   start date: Oct 27 04:33:31 2019 GMT
*   expire date: Jan 25 04:33:31 2020 GMT
*   common name: dex.mydomain.com
*   issuer: CN=Let's Encrypt Authority X3,O=Let's Encrypt,C=US
> GET /.well-known/openid-configuration HTTP/1.1
> User-Agent: curl/7.29.0
> Host: dex.mydomain.com
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: openresty/1.15.8.2
< Date: Sun, 27 Oct 2019 06:55:30 GMT
< Content-Type: application/json
< Content-Length: 774
< Connection: keep-alive
< Vary: Accept-Encoding
< Strict-Transport-Security: max-age=15724800; includeSubDomains
<
{
  "issuer": "https://dex.mydomain.com",
  "authorization_endpoint": "https://dex.mydomain.com/auth",
  "token_endpoint": "https://dex.mydomain.com/token",
  "jwks_uri": "https://dex.mydomain.com/keys",
  "userinfo_endpoint": "https://dex.mydomain.com/userinfo",
  "response_types_supported": [
    "code"
  ],
  "subject_types_supported": [
    "public"
  ],
  "id_token_signing_alg_values_supported": [
    "RS256"
  ],
  "scopes_supported": [
    "openid",
    "email",
    "groups",
    "profile",
    "offline_access"
  ],
  "token_endpoint_auth_methods_supported": [
    "client_secret_basic"
  ],
  "claims_supported": [
    "aud",
    "email",
    "email_verified",
    "exp",
    "iat",
    "iss",
    "locale",
    "name",
    "sub"
  ]
* Connection #0 to host dex.mydomain.com left intact

然后，我通过添加以下 containers.command 行在我的 kubernetes 主节点上编辑我的 kubeapi 清单：

- --oidc-issuer-url=https://dex.mydomain.com
- --oidc-ca-file=/etc/pki/ca-trust/source/anchors/letsencrypt.pem
- --oidc-client-id=oidc-auth-client
- --oidc-username-claim=email
- --oidc-groups-claim=groups

我等待 kubernetes 主 pod 自行重启。一切都恢复正常。我仔细检查了在吊舱/etc/pki/ca-trust/source/anchors/letsencrypt.pem内是否可以访问。kube-apiserver-k8s

我在没有a 的情况下配置了舷梯，trustedCAPath然后我继续转到我的舷梯入口，然后我看到了 dex 身份验证页面。我选择 LDAP，输入我的企业帐户详细信息，然后 gangway 继续执行预期的操作：

echo "-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
" \ > ca-k8s-cluster.pem
kubectl config set-cluster k8s-cluster --server=https://k8s-login.mydomain.com/ --certificate-authority=ca-k8s-cluster.pem --embed-certs
kubectl config set-credentials me@mydomain.com  \
    --auth-provider=oidc  \
    --auth-provider-arg='idp-issuer-url=https://dex.mydomain.com'  \
    --auth-provider-arg='client-id=oidc-auth-client'  \
    --auth-provider-arg='client-secret=wqTkyx6vtpH56FI9K3DE+IaFuwTVToJ5f3CBAuidTtU=' \
    --auth-provider-arg='refresh-token=Chl2bWtrYTJsdnlvZWt4dW9raGc3aGxrcnpxEhlvdmlwcWZ2c3dsZGQ0d3dzd3M3a2ZmNHVq' \
    --auth-provider-arg='id-token=eyJhbGciOiJSUzI1NiIsImtpZCI6ImFlZDFlMzYxY2NmMjY4NzI3MDVjYTBmNDcxYzFlMDgzZGQ1MjA4YWUifQ.eyJpc3MiOiJodHRwczovL2RleC5zbGFjLnN0YW5mb3JkLmVkdSIsInN1YiI6IkNnTjVkR3dTQkd4a1lYQSIsImF1ZCI6Im9pZGMtYXV0aC1jbGllbnQiLCJleHAiOjE1NzIyNDQ3ODYsImlhdCI6MTU3MjE1ODM4NiwiYXRfaGFzaCI6IlVEdUxfNFdGb3JTRTZhSzNzY0wtQ0EiLCJlbWFpbCI6Inl0bEBzbGFjLnN0YW5mb3JkLmVkdSIsImVtYWlsX3ZlcmlmaWVkIjp0cnVlLCJuYW1lIjoiWWVlIFRpbmcgTGkifQ.Qyjf_IXxyHX7-Z8uLHNxCfC7ne0fZfCk4XoyVD_tom-b9bLf72-p1IxW8HPLo6QgCcnH9QFw3X4XKpFU7sjXZTwu59CxkCfQSG1XKHIKrzUbX7g3c4ZX1b7r7tTnAmGXTj-nG15crYnBcJjgFJRac_qKjqJUBED1_RUjKXzjpQaSlhmsnu8roRVcUJvHnsORHZlSF2kOYlLFlW2fi8cYa3JXISBhY2vzUYJmwopFF8LP3C_GrzrjEsql0984yFDHYNGKtnVhBRCFDBEmBEc9OgxEi8OXuN93pKu-ApNiagaoVBprgWzgl2eijogkCrHn_T7NcXBpx211V1YzXs_-_w'
kubectl config set-context k8s-cluster --cluster=k8s-cluster --user=me@mydomain.com
kubectl config use-context k8s-cluster
rm ca-k8s-cluster.pem

我尽职尽责地将其粘贴到我的终端中。但是，当我尝试（没有为自己设置任何 RBAC 角色）时，我得到

$ kubectl  get pods
Unable to connect to the server: x509: certificate signed by unknown authority

我也尝试--oidc-ca-file从 kubeapi 中删除，但我得到了同样的错误。

我也尝试添加

--auth-provider-arg='idp-certificate-authority=/etc/pki/ca-trust/source/anchors/letsencrypt.pem'

我kubectl config的凭据 - 但无济于事。

我也试过：

$ kubectl --insecure-skip-tls-verify=true get pods
error: yaml: line 13: mapping values are not allowed in this context

我在 kupeapi 日志中没有看到任何异常，我完全不知道接下来要尝试什么。有什么建议么？

标签： authenticationkubectlopenid-connectopenid-dex

解决方案

grrr....我解决了。一切都在这条线上：

kubectl config set-cluster k8s-cluster --server=https://k8s-login.mydomain.com/ --certificate-authority=ca-k8s-cluster.pem --embed-certs

有--server问题的应该是 kubeapi 端点，而不是我的舷梯服务器！我将此追溯到我apiServerURL在舷梯配置图中的重复。

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