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f015fd66ce
- Also update test-cmd.sh to pass a signing ca to the kube controller manager, so CSRs work properly in integration tests. Signed-off-by: Margo Crawford <margaretc@vmware.com>
329 lines
13 KiB
Bash
329 lines
13 KiB
Bash
#!/usr/bin/env bash
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# Copyright 2020 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -o errexit
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set -o nounset
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set -o pipefail
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run_exec_credentials_tests() {
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run_exec_credentials_tests_version client.authentication.k8s.io/v1beta1
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run_exec_credentials_tests_version client.authentication.k8s.io/v1
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}
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run_exec_credentials_tests_version() {
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set -o nounset
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set -o errexit
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local -r apiVersion="$1"
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kube::log::status "Testing kubectl with configured ${apiVersion} exec credentials plugin"
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cat > "${TMPDIR:-/tmp}"/invalid_exec_plugin.yaml << EOF
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apiVersion: v1
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clusters:
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- cluster:
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name: test
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contexts:
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- context:
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cluster: test
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user: invalid_token_user
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name: test
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current-context: test
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kind: Config
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preferences: {}
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users:
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- name: invalid_token_user
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user:
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exec:
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apiVersion: ${apiVersion}
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# Any invalid exec credential plugin will do to demonstrate
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command: ls
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interactiveMode: IfAvailable
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EOF
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### Provided --token should take precedence, thus not triggering the (invalid) exec credential plugin
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# Pre-condition: Client certificate authentication enabled on the API server
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kube::util::test_client_certificate_authentication_enabled
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# Command
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output=$(kubectl "${kube_flags_with_token[@]:?}" --kubeconfig="${TMPDIR:-/tmp}"/invalid_exec_plugin.yaml get namespace kube-system -o name || true)
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if [[ "${output}" == "namespace/kube-system" ]]; then
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kube::log::status "exec credential plugin not triggered since kubectl was called with provided --token"
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else
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kube::log::status "Unexpected output when providing --token for authentication - exec credential plugin likely triggered. Output: ${output}"
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exit 1
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fi
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# Post-condition: None
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### Without provided --token, the exec credential plugin should be triggered
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# Pre-condition: Client certificate authentication enabled on the API server - already checked by positive test above
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# Command
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output2=$(kubectl "${kube_flags_without_token[@]:?}" --kubeconfig="${TMPDIR:-/tmp}"/invalid_exec_plugin.yaml get namespace kube-system -o name 2>&1 || true)
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if [[ "${output2}" =~ "json parse error" ]]; then
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kube::log::status "exec credential plugin triggered since kubectl was called without provided --token"
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else
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kube::log::status "Unexpected output when not providing --token for authentication - exec credential plugin not triggered. Output: ${output2}"
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exit 1
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fi
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# Post-condition: None
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cat >"${TMPDIR:-/tmp}"/valid_exec_plugin.yaml <<EOF
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apiVersion: v1
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clusters:
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- cluster:
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name: test
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contexts:
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- context:
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cluster: test
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user: valid_token_user
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name: test
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current-context: test
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kind: Config
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preferences: {}
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users:
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- name: valid_token_user
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user:
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exec:
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apiVersion: ${apiVersion}
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command: echo
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args:
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- '{"apiVersion":"${apiVersion}","status":{"token":"admin-token"}}'
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interactiveMode: IfAvailable
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EOF
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### Valid exec plugin should authenticate user properly
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# Pre-condition: Client certificate authentication enabled on the API server - already checked by positive test above
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# Command
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output3=$(kubectl "${kube_flags_without_token[@]:?}" --kubeconfig="${TMPDIR:-/tmp}"/valid_exec_plugin.yaml get namespace kube-system -o name 2>&1 || true)
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if [[ "${output3}" == "namespace/kube-system" ]]; then
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kube::log::status "exec credential plugin triggered and provided valid credentials"
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else
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kube::log::status "Unexpected output when using valid exec credential plugin for authentication. Output: ${output3}"
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exit 1
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fi
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# Post-condition: None
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### Provided --username/--password should take precedence, thus not triggering the (valid) exec credential plugin
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# Pre-condition: Client certificate authentication enabled on the API server - already checked by positive test above
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# Command
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output4=$(kubectl "${kube_flags_without_token[@]:?}" --username bad --password wrong --kubeconfig="${TMPDIR:-/tmp}"/valid_exec_plugin.yaml get namespace kube-system -o name 2>&1 || true)
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if [[ "${output4}" =~ "Unauthorized" ]]; then
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kube::log::status "exec credential plugin not triggered since kubectl was called with provided --username/--password"
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else
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kube::log::status "Unexpected output when providing --username/--password for authentication - exec credential plugin likely triggered. Output: ${output4}"
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exit 1
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fi
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# Post-condition: None
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### Provided --client-certificate/--client-key should take precedence on the cli, thus not triggering the (invalid) exec credential plugin
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# contained in the kubeconfig.
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# Use CSR to get a valid certificate
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cat <<EOF | kubectl create -f -
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apiVersion: certificates.k8s.io/v1
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kind: CertificateSigningRequest
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metadata:
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name: testuser
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spec:
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request: $(base64 < hack/testdata/auth/testuser.csr | tr -d '\n')
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signerName: kubernetes.io/kube-apiserver-client
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usages: [client auth]
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EOF
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kube::test::wait_object_assert 'csr/testuser' '{{range.status.conditions}}{{.type}}{{end}}' ''
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kubectl certificate approve testuser
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kube::test::wait_object_assert 'csr/testuser' '{{range.status.conditions}}{{.type}}{{end}}' 'Approved'
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# wait for certificate to not be empty
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kube::test::wait_object_assert 'csr/testuser' '{{.status.certificate}}' '.+'
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kubectl get csr testuser -o jsonpath='{.status.certificate}' | base64 -d > "${TMPDIR:-/tmp}"/testuser.crt
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output5=$(kubectl "${kube_flags_without_token[@]:?}" --client-certificate="${TMPDIR:-/tmp}"/testuser.crt --client-key="hack/testdata/auth/testuser.key" --kubeconfig="${TMPDIR:-/tmp}"/invalid_exec_plugin.yaml get namespace kube-system -o name)
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if [[ "${output5}" =~ "Unauthorized" ]]; then
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kube::log::status "Unexpected output when providing --client-certificate/--client-key for authentication - exec credential plugin likely triggered. Output: ${output5}"
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exit 1
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else
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kube::log::status "exec credential plugin not triggered since kubectl was called with provided --client-certificate/--client-key"
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fi
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### Provided --client-certificate/--client-key should take precedence in the kubeconfig, thus not triggering the (invalid) exec credential plugin.
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cat >"${TMPDIR:-/tmp}"/invalid_execcredential.sh <<EOF
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#!/bin/bash
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echo '{"kind":"ExecCredential","apiVersion":"client.authentication.k8s.io/v1beta1","status":{"clientKeyData":"bad","clientCertificateData":"bad"}}'
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EOF
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chmod +x "${TMPDIR:-/tmp}"/invalid_execcredential.sh
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kubectl config set-credentials testuser --client-certificate="${TMPDIR:-/tmp}"/testuser.crt --client-key="hack/testdata/auth/testuser.key" --exec-api-version=client.authentication.k8s.io/v1beta1 --exec-command=/tmp/invalid_execcredential.sh
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output6=$(kubectl "${kube_flags_without_token[@]:?}" --user testuser get namespace kube-system -o name)
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if [[ "${output6}" =~ "Unauthorized" ]]; then
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kube::log::status "Unexpected output when kubeconfig was configured with --client-certificate/--client-key for authentication - exec credential plugin likely triggered. Output: ${output6}"
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exit 1
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else
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kube::log::status "exec credential plugin not triggered since kubeconfig was configured with --client-certificate/--client-key for authentication"
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fi
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kubectl delete csr testuser
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rm "${TMPDIR:-/tmp}"/invalid_execcredential.sh
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rm "${TMPDIR:-/tmp}"/invalid_exec_plugin.yaml
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rm "${TMPDIR:-/tmp}"/valid_exec_plugin.yaml
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set +o nounset
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set +o errexit
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}
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run_exec_credentials_interactive_tests() {
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run_exec_credentials_interactive_tests_version client.authentication.k8s.io/v1beta1
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run_exec_credentials_interactive_tests_version client.authentication.k8s.io/v1
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}
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run_exec_credentials_interactive_tests_version() {
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set -o nounset
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set -o errexit
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local -r apiVersion="$1"
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kube::log::status "Testing kubectl with configured ${apiVersion} interactive exec credentials plugin"
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cat >"${TMPDIR:-/tmp}"/always_interactive_exec_plugin.yaml <<EOF
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apiVersion: v1
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clusters:
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- cluster:
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name: test
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contexts:
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- context:
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cluster: test
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user: always_interactive_token_user
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name: test
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current-context: test
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kind: Config
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preferences: {}
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users:
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- name: always_interactive_token_user
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user:
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exec:
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apiVersion: ${apiVersion}
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command: echo
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args:
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- '{"apiVersion":"${apiVersion}","status":{"token":"admin-token"}}'
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interactiveMode: Always
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EOF
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### The exec credential plugin should not be run if it kubectl already uses standard input
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# Pre-condition: The kubectl command requires standard input
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some_resource='{"apiVersion":"v1","kind":"ConfigMap","metadata":{"name":"some-resource"}}'
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# Declare map from kubectl command to standard input data
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declare -A kubectl_commands
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kubectl_commands["apply -f -"]="$some_resource"
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kubectl_commands["set env deployment/some-deployment -"]="SOME_ENV_VAR_KEY=SOME_ENV_VAR_VAL"
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kubectl_commands["replace -f - --force"]="$some_resource"
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failure=
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for kubectl_command in "${!kubectl_commands[@]}"; do
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# Use a separate bash script for the command here so that script(1) will not get confused with kubectl flags
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script_file="${TMPDIR:-/tmp}/test-cmd-exec-credentials-script-file.sh"
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cat <<EOF >"$script_file"
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#!/usr/bin/env bash
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set -o errexit
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set -o nounset
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set -o pipefail
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kubectl ${kube_flags_without_token[*]:?} --kubeconfig=${TMPDIR:-/tmp}/always_interactive_exec_plugin.yaml ${kubectl_command} 2>&1 || true
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EOF
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chmod +x "$script_file"
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# Run kubectl as child of script(1) so kubectl will always run with a PTY
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# Dynamically build script(1) command so that we can conditionally add flags on Linux
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script_command="script -q /dev/null"
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if [[ "$(uname)" == "Linux" ]]; then script_command="${script_command} -c"; fi
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script_command="${script_command} ${script_file}"
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# Specify SHELL env var when we call script(1) since it is picky about the format of the env var
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shell="$(which bash)"
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kube::log::status "Running command '$script_command' (kubectl command: '$kubectl_command') with input '${kubectl_commands[$kubectl_command]}'"
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output=$(echo "${kubectl_commands[$kubectl_command]}" | SHELL="$shell" $script_command)
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if [[ "${output}" =~ "used by stdin resource manifest reader" ]]; then
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kube::log::status "exec credential plugin not run because kubectl already uses standard input"
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else
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kube::log::status "Unexpected output when running kubectl command that uses standard input. Output: ${output}"
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failure=yup
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fi
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done
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if [[ -n "$failure" ]]; then
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exit 1
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fi
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# Post-condition: None
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cat >"${TMPDIR:-/tmp}"/missing_interactive_exec_plugin.yaml <<EOF
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apiVersion: v1
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clusters:
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- cluster:
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name: test
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contexts:
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- context:
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cluster: test
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user: missing_interactive_token_user
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name: test
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current-context: test
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kind: Config
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preferences: {}
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users:
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- name: missing_interactive_token_user
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user:
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exec:
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apiVersion: ${apiVersion}
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command: echo
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args:
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- '{"apiVersion":"${apiVersion}","status":{"token":"admin-token"}}'
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EOF
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### The kubeconfig will fail to be loaded if a v1 exec credential plugin is missing an interactiveMode field, otherwise it will default to IfAvailable
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# Pre-condition: The exec credential plugin is missing an interactiveMode setting
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output2=$(kubectl "${kube_flags_without_token[@]:?}" --kubeconfig="${TMPDIR:-/tmp}"/missing_interactive_exec_plugin.yaml get namespace kube-system -o name 2>&1 || true)
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if [[ "$apiVersion" == "client.authentication.k8s.io/v1" ]]; then
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if [[ "${output2}" =~ "error: interactiveMode must be specified for missing_interactive_token_user to use exec authentication plugin" ]]; then
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kube::log::status "kubeconfig was not loaded successfully because ${apiVersion} exec credential plugin is missing interactiveMode"
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else
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kube::log::status "Unexpected output when running kubectl command that uses a ${apiVersion} exec credential plugin without an interactiveMode. Output: ${output2}"
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exit 1
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fi
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else
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if [[ "${output2}" == "namespace/kube-system" ]]; then
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kube::log::status "${apiVersion} exec credential plugin triggered and provided valid credentials"
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else
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kube::log::status "Unexpected output when using valid exec credential plugin for authentication. Output: ${output2}"
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exit 1
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fi
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fi
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# Post-condition: None
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rm "${TMPDIR:-/tmp}"/always_interactive_exec_plugin.yaml
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rm "${TMPDIR:-/tmp}"/missing_interactive_exec_plugin.yaml
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set +o nounset
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set +o errexit
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}
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