diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml new file mode 100644 index 0000000..de87577 --- /dev/null +++ b/.github/workflows/ci.yaml @@ -0,0 +1,20 @@ +name: CI + +on: + push: + branches: [ "*" ] + pull_request: + branches: [ "*" ] + +jobs: + golangci: + name: lint + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v2 + - name: Run golangci-lint + uses: golangci/golangci-lint-action@v2.3.0 + with: + version: latest + only-new-issues: false + args: --timeout 2m --config .golangci.yml diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml new file mode 100644 index 0000000..4022847 --- /dev/null +++ b/.github/workflows/release.yaml @@ -0,0 +1,26 @@ +name: Release + +on: + push: + tags: + - '*' + +jobs: + goreleaser: + runs-on: ubuntu-latest + steps: + - name: Checkout + uses: actions/checkout@v2 + with: + fetch-depth: 0 + - name: Set up Go + uses: actions/setup-go@v2 + with: + go-version: 1.14 + - name: Run GoReleaser + uses: goreleaser/goreleaser-action@v2 + with: + version: latest + args: release --rm-dist + env: + GITHUB_TOKEN: ${{ secrets.BOT_GITHUB_TOKEN }} diff --git a/.gitignore b/.gitignore index 3ce0f15..6f0a069 100644 --- a/.gitignore +++ b/.gitignore @@ -9,4 +9,6 @@ *.cnf # .kubeconfig -*.kubeconfig \ No newline at end of file +*.kubeconfig + +.idea diff --git a/.golangci.yml b/.golangci.yml new file mode 100644 index 0000000..0356b1d --- /dev/null +++ b/.golangci.yml @@ -0,0 +1,51 @@ +linters-settings: + govet: + check-shadowing: true + golint: + min-confidence: 0 + maligned: + suggest-new: true + goimports: + local-prefixes: github.com/clastix/kubectl-login + dupl: + threshold: 100 + goconst: + min-len: 2 + min-occurrences: 2 +linters: + disable-all: true + enable: + - bodyclose + - deadcode + - depguard + - dogsled + - dupl + - errcheck + - goconst + - gocritic + - gofmt + - goimports + - golint + - goprintffuncname + - gosec + - gosimple + - govet + - ineffassign + - interfacer + - misspell + - nolintlint + - rowserrcheck + - scopelint + - staticcheck + - structcheck + - stylecheck + - typecheck + - unconvert + - unparam + - unused + - varcheck + - whitespace + - maligned + +service: + golangci-lint-version: 1.33.x diff --git a/.goreleaser.yml b/.goreleaser.yml new file mode 100644 index 0000000..d4fb772 --- /dev/null +++ b/.goreleaser.yml @@ -0,0 +1,23 @@ +before: + hooks: + - go mod download +builds: +- env: + - CGO_ENABLED=0 +archives: +- replacements: + darwin: Darwin + linux: Linux + windows: Windows + 386: i386 + amd64: x86_64 +checksum: + name_template: 'checksums.txt' +snapshot: + name_template: "{{ .Tag }}-next" +changelog: + sort: asc + filters: + exclude: + - '^docs:' + - '^test:' diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md index d043a02..31866ca 100644 --- a/README.md +++ b/README.md @@ -2,7 +2,7 @@ `kubectl-login` is a CLI utility to discover and securely login Kubernetes clusters across multiple operating environments, including loacal setups and cloud providers, i.e. EKS, AKS, GKE. It can be used as `kubectl` plugin or as standalone binary. -Based on the configured authentication mechanism, e.g. TLS client, OIDC, it will login users in the Kubernetes clusters they are allowed to access and generate a `kubeconfig` for a chosen cluster. +Based on the configured authentication mechanism, e.g. TLS client, OIDC, it will log in users in the Kubernetes clusters they are allowed to access and generate a `kubeconfig` for a chosen cluster. ## Features @@ -20,9 +20,10 @@ Based on the configured authentication mechanism, e.g. TLS client, OIDC, it will ## Installation -Install [curl](https://github.com/curl/curl) and [jq](https://stedolan.github.io/jq/) dependencies if you don't already in your system. -Copy the `kubectl-login` script somewhere on your `PATH`, and set it executable: +Download the release from the GitHub Release section according to your OS and architecture. + +Copy the binary somewhere on your `PATH`, and set it executable: ```bash $ chmod u+x kubectl-login` @@ -33,76 +34,107 @@ Once you have installed `kubectl-login` you can see a list of the commands avail ``` $ kubectl login -h -Usage: /usr/local/bin/kubectl-login [OPTIONS] - - OPTIONS: - --help display usage - --login login to the OIDC Server - --token return a valid id_token - --setup configure current kubeconfig - +kubectl-login is a CLI utility to discover and securely login Kubernetes clusters across multiple operating +environments, including local setups and cloud providers, i.e. EKS, AKS, GKE. + +Based on the configured authentication mechanism (e.g. TLS client, OIDC), it will login users in the Kubernetes clusters +they are allowed to access and generate a kubeconfig for a chosen cluster. + +Usage: + login [flags] + login [command] + +Available Commands: + get-token Return a credential execution required by kubectl with the updated ID token + help Help about any command + +Flags: + --config string config file (default is $HOME/.kubectl-login.yaml) + -h, --help help for login + --k8s-api-server string Endpoint of the Kubernetes API server to connect to + --k8s-insecure-skip-tls-verify Disable TLS certificate verification for the Kubernetes API server + --k8s-server-ca-path string Path to the Kubernetes API server certificate authority PEM encoded file + --kubeconfig-path string Path to the generated kubeconfig file upon resulting login procedure to access the Kubernetes cluster (default "oidc.kubeconfig") + --oidc-client-id string The OIDC client ID provided + --oidc-insecure-skip-tls-verify Disable TLS certificate verification for the OIDC server + --oidc-server string The OIDC server URL to connect to + --oidc-server-ca-path string Path to the OIDC server certificate authority PEM encoded file + -v, --verbose Toggle the verbose logging + +Use "login [command] --help" for more information about a command. ``` Create an initial setup: ``` -$ kubectl login --setup -[Tue Jan 12 18:26:21 CET 2021][INFO] Checking if prerequisites are installed -[Tue Jan 12 18:26:21 CET 2021][INFO] Starting OIDC login with PKCE -[Tue Jan 12 18:26:21 CET 2021][INFO] Setting up configuration -Kubernetes APIs Server: https://cmp.clastix.io -OIDC Server URL: https://sso.clastix.io/auth/realms/caas -OIDC Client ID: kubectl -[Tue Jan 12 18:26:50 CET 2021][INFO] Getting OIDC configuration from https://sso.clastix.io/auth/realms/caas -[Tue Jan 12 18:26:50 CET 2021][INFO] Generating PKCE Code Verifier and Challenge -[Tue Jan 12 18:26:50 CET 2021][INFO] Creating authorization URI - -Go to the following link in your browser: +$ kubectl login --k8s-api-server=https://cmp.clastix.io --k8s-server-ca-path=/path/to/k8s/ca.pem --oidc-server=https://sso.clastix.io/auth/realms/caas --oidc-client-id=kubectl -v +2021-01-27T18:15:16.988Z INFO cmd/root.go:102 Starting the login procedure +2021-01-27T18:15:16.988Z INFO actions/oidc_config.go:63 Starting OIDC login with PKCE +2021-01-27T18:15:16.988Z INFO actions/oidc_config.go:74 Getting OIDC configuration from the server {"OIDCServer": "https://sso.clastix.io/auth/realms/caas"} +2021-01-27T18:15:17.022Z INFO actions/code_verifier.go:38 Generating PKCE Code Verifier and Challenge +2021-01-27T18:15:17.022Z INFO actions/code_verifier.go:39 PKCE code verifier generated {"code": "PZD4n80AepGINMw1au4fMj73K0R38EXyPGd0QhmsIF3a3KRU3NBh2QwzSd9PAQ5dt1JifcbaixysCXIAQKhkV0lPituFgtTeWBIcWFmrfMCwvt8Cni2OP6vTc3sWOgPe"} +2021-01-27T18:15:17.023Z INFO actions/create_auth_uri.go:45 Creating authorization URI -https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/auth?response_type=code&client_id=kubectl&redirect_uri=urn:ietf:wg:oauth:2.0:oob&scope=openid+groups+offline_access&state=LnA6VFW3L0NmnrxDUNg52gKwbM3yI5MnDtWxKtPV4&prompt=consent&code_challenge=1icW0jFFHTcOU5QBZO_nGKiFdeg8Uo5nuel3MbCdoSo&code_challenge_method=S256&access_type=offline +Proceed to login to the following link using your browser: -Enter verification code: ************** +https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/auth?access_type=offline&client_id=kubectl&code_challenge=EYpNK9lNI3g9ridirZLUxzZZC4uJPdIIdheVOYHZReY&code_challenge_method=S256&prompt=consent&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code&scope=openid+groups+offline_access&state=TDE5a90dfVLyeXxaHIbExowZoa344IztYcPXRgX0M -[Tue Jan 12 18:27:07 CET 2021][INFO] Requesting token from https://sso.clastix.io/auth/realms/caas -[Tue Jan 12 18:27:07 CET 2021][INFO] Saving token to cache -[Tue Jan 12 18:27:07 CET 2021][INFO] Saving configuration to ~/.kube/oidc.conf -[Tue Jan 12 18:27:07 CET 2021][INFO] Creating kubeconfig +Type the verification code: d9938e34-5788-4449-892a-de189a3595a9.5ab118b7-9f2e-4cb7-b7b2-a24d5457ed5c.20c2ccb0-4af6-419b-b1b8-c1118e72236b +2021-01-27T18:15:28.832Z DEBUG cmd/root.go:137 User input code is d9938e34-5788-4449-892a-de189a3595a9.5ab118b7-9f2e-4cb7-b7b2-a24d5457ed5c.20c2ccb0-4af6-419b-b1b8-c1118e72236b +Your login procedure has been completed! -Make sure you can access the Kubernetes cluster: +You can start interacting with your Kubernetes cluster using the generated kubeconfig file: +export KUBECONFIG=oidc.kubeconfig - $ export KUBECONFIG=oidc.kubeconfig - $ kubectl --user=oidc get pods +Happy Kubernetes interaction! ``` -The initial setup creates and stores configurations in the file `~/.kube/oidc.conf` +The initial setup creates and stores configurations in the file `~/.kubectl-login.yaml` ```bash -API_SERVER=https://cmp.clastix.io -OIDC_SERVER=https://sso.clastix.io/auth/realms/caas -OIDC_CLIENT_ID=kubectl -CODE_CHALLENGE_METHOD=S256 -AUTH_ENDPOINT=https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/auth -TOKEN_ENDPOINT=https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/token -INTROSPECTION_ENDPOINT=https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/token/introspect -USERINFO_ENDPOINT=https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/userinfo -END_SESSION_ENDPOINT=https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/logout +kubernetes: + ca: + insecure: false + endpoint: https://cmp.clastix.io + kubeconfig: oidc.kubeconfig +oidc: + ca: + insecure: false + clientid: kubectl + server: https://sso.clastix.io/auth/realms/caas +token: + endpoint: https://sso.clastix.io/auth/realms/caas/protocol/openid-connect/token + id: REDACTED + refresh: REDACTED ``` A `kubeconfig` file is created as: ```yaml +apiVersion: v1 +clusters: + - cluster: + server: https://cmp.clastix.io + name: kubernetes +contexts: + - context: + cluster: kubernetes + user: oidc + name: oidc +current-context: oidc kind: Config preferences: {} users: -- name: oidc - user: - exec: - apiVersion: client.authentication.k8s.io/v1beta1 - args: - - login - - --token - command: kubectl - env: null + - name: oidc + user: + exec: + apiVersion: client.authentication.k8s.io/v1beta1 + args: + - login + - get-token + command: kubectl + env: null + provideClusterInfo: false ... ``` @@ -120,10 +152,10 @@ example-5b64df8865-z6ts9 1/1 Running 0 13h You can start the login process any time by simply running: ``` -$ kubectl login --login +$ kubectl login ``` ## Contributions -`kubectl-login` is released with Apache2 open source license. Contributions are very welcome! \ No newline at end of file +`kubectl-login` is released with Apache 2 open source license. Contributions are very welcome! diff --git a/cmd/constants.go b/cmd/constants.go new file mode 100644 index 0000000..c588e26 --- /dev/null +++ b/cmd/constants.go @@ -0,0 +1,49 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package cmd + +const ( + // Kubernetes viper keys + K8SAPIServer = "kubernetes.endpoint" + KubeconfigPath = "kubernetes.kubeconfig" + K8SSkipTLSVerify = "kubernetes.ca.insecure" + K8SCertificateAuthorityPath = "kubernetes.ca.path" + // OIDC viper keys + OIDCServer = "oidc.server" + OIDCClientID = "oidc.clientid" + OIDCSkipTLSVerify = "oidc.ca.insecure" + OIDCCertificateAuthority = "oidc.ca.path" + // Token viper keys + TokenID = "token.id" + TokenRefresh = "token.refresh" + TokenEndpoint = "token.endpoint" +) + +var ( + flagsMap = map[string]string{ + // OIDC flags + OIDCServer: "oidc-server", + OIDCClientID: "oidc-client-id", + OIDCSkipTLSVerify: "oidc-insecure-skip-tls-verify", + OIDCCertificateAuthority: "oidc-server-ca-path", + // Kubernetes flags + K8SAPIServer: "k8s-api-server", + K8SSkipTLSVerify: "k8s-insecure-skip-tls-verify", + K8SCertificateAuthorityPath: "k8s-server-ca-path", + KubeconfigPath: "kubeconfig-path", + } +) diff --git a/cmd/get_token.go b/cmd/get_token.go new file mode 100644 index 0000000..f7688fe --- /dev/null +++ b/cmd/get_token.go @@ -0,0 +1,95 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package cmd + +import ( + "bytes" + "fmt" + + "github.com/dgrijalva/jwt-go" + "github.com/spf13/cobra" + "github.com/spf13/viper" + "go.uber.org/zap" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/runtime/serializer/json" + clientauthenticationv1beta1 "k8s.io/client-go/pkg/apis/clientauthentication/v1beta1" + + "github.com/clastix/kubectl-login/internal/actions" +) + +var tokenCmd = &cobra.Command{ + Use: "get-token", + Short: "Return a credential execution required by kubectl with the updated ID token", + RunE: func(cmd *cobra.Command, args []string) (err error) { + var idToken string + if idToken = viper.GetString(TokenID); len(idToken) == 0 { + return fmt.Errorf("the ID Token is not yet configured, please issue the login process first") + } + + logger.Info("Decoding the ID token as JWT") + claims := &jwt.MapClaims{} + parser := jwt.Parser{SkipClaimsValidation: true} + if _, _, err = parser.ParseUnverified(idToken, claims); err != nil { + return fmt.Errorf("token ID is a non JWT encoded string (%w)", err) + } + + if err = claims.Valid(); err != nil { + logger.Info("proceeding to token refresh") + logger.Debug("JWT claim is not valid due to error", zap.Error(err)) + + var refreshToken string + idToken, refreshToken, err = actions.NewRefreshToken(logger, true, viper.GetString(TokenEndpoint), viper.GetString(OIDCClientID), viper.GetString(TokenRefresh)).Handle() + if err != nil { + return fmt.Errorf("cannot refresh token due to an error (%w)", err) + } + + viper.Set(TokenID, idToken) + viper.Set(TokenRefresh, refreshToken) + + defer func() { + if err = viper.WriteConfig(); err != nil { + logger.Error("Cannot write configuration file", zap.Error(err)) + } + }() + } + ec := &clientauthenticationv1beta1.ExecCredential{ + TypeMeta: metav1.TypeMeta{ + Kind: "ExecCredential", + APIVersion: "client.authentication.k8s.io/v1beta1", + }, + Status: &clientauthenticationv1beta1.ExecCredentialStatus{ + Token: viper.GetString(TokenID), + }, + } + + scheme := runtime.NewScheme() + encoder := json.NewSerializerWithOptions(json.SimpleMetaFactory{}, scheme, scheme, json.SerializerOptions{}) + a := bytes.NewBuffer([]byte{}) + if err = encoder.Encode(ec, a); err != nil { + return fmt.Errorf("cannot encode kubeconfig to JSON (%w)", err) + } + + fmt.Println(a.String()) + + return nil + }, +} + +func init() { + rootCmd.AddCommand(tokenCmd) +} diff --git a/cmd/logger.go b/cmd/logger.go new file mode 100644 index 0000000..30ea749 --- /dev/null +++ b/cmd/logger.go @@ -0,0 +1,27 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package cmd + +import ( + "go.uber.org/zap" +) + +var logger *zap.Logger + +func init() { + logger = zap.NewNop() +} diff --git a/cmd/root.go b/cmd/root.go new file mode 100644 index 0000000..59a8655 --- /dev/null +++ b/cmd/root.go @@ -0,0 +1,289 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package cmd + +import ( + "bufio" + "bytes" + "errors" + "fmt" + "os" + "path" + "strings" + + "github.com/mitchellh/go-homedir" + "github.com/spf13/afero" + "github.com/spf13/cobra" + "github.com/spf13/viper" + "go.uber.org/zap" + "k8s.io/apimachinery/pkg/runtime" + "k8s.io/apimachinery/pkg/runtime/serializer/json" + "k8s.io/apimachinery/pkg/runtime/serializer/yaml" + v1 "k8s.io/client-go/tools/clientcmd/api/v1" + + "github.com/clastix/kubectl-login/internal/actions" + "github.com/clastix/kubectl-login/internal/oidc" +) + +var cfgFile string + +var rootCmd = &cobra.Command{ + Use: "login", + Short: "CLI utility to discover and securely login Kubernetes clusters across multiple operating environments", + Long: `kubectl-login is a CLI utility to discover and securely login Kubernetes clusters across multiple operating +environments, including local setups and cloud providers, i.e. EKS, AKS, GKE. + +Based on the configured authentication mechanism (e.g. TLS client, OIDC), it will login users in the Kubernetes clusters +they are allowed to access and generate a kubeconfig for a chosen cluster.`, + SilenceUsage: true, + PersistentPreRunE: func(cmd *cobra.Command, args []string) (err error) { + if ok, _ := cmd.Flags().GetBool("verbose"); ok { + logger, err = zap.NewDevelopment() + if err != nil { + return + } + } + + if v, _ := cmd.Flags().GetString(flagsMap[OIDCServer]); len(v) > 0 { + viper.Set(OIDCServer, v) + } + if v, _ := cmd.Flags().GetString(flagsMap[OIDCClientID]); len(v) > 0 { + viper.Set(OIDCClientID, v) + } + if cmd.Flag(flagsMap[OIDCSkipTLSVerify]).Changed { + v, _ := cmd.Flags().GetBool(flagsMap[OIDCSkipTLSVerify]) + viper.Set(OIDCSkipTLSVerify, v) + } + if v, _ := cmd.Flags().GetString(flagsMap[OIDCCertificateAuthority]); len(v) > 0 { + viper.Set(OIDCCertificateAuthority, v) + } + + if v, _ := cmd.Flags().GetString(flagsMap[K8SAPIServer]); len(v) > 0 { + viper.Set(K8SAPIServer, v) + } + if cmd.Flag(flagsMap[K8SSkipTLSVerify]).Changed { + v, _ := cmd.Flags().GetBool(flagsMap[K8SSkipTLSVerify]) + viper.Set(K8SSkipTLSVerify, v) + } + if v, _ := cmd.Flags().GetString(flagsMap[K8SCertificateAuthorityPath]); len(v) > 0 { + viper.Set(K8SCertificateAuthorityPath, v) + } + if v, _ := cmd.Flags().GetString(flagsMap[KubeconfigPath]); len(v) > 0 { + viper.Set(KubeconfigPath, v) + } + + if v := viper.GetString(OIDCServer); len(v) == 0 { + return errors.New("missing OIDC server endpoint") + } + if v := viper.GetString(OIDCClientID); len(v) == 0 { + return errors.New("missing OIDC server endpoint") + } + if v := viper.GetString(K8SAPIServer); len(v) == 0 { + return errors.New("missing Kubernetes API server") + } + if v := viper.GetString(KubeconfigPath); len(v) == 0 { + return errors.New("missing path to the resulting kubeconfig") + } + + return nil + }, + RunE: func(cmd *cobra.Command, args []string) (err error) { + logger.Info("Starting the login procedure") + + // Creating OIDC server HTTP client with TLS handling + var client *oidc.HTTPClient + client, err = oidc.NewHTTPClient(viper.GetString(OIDCCertificateAuthority), viper.GetBool(OIDCSkipTLSVerify)) + if err != nil { + return + } + + // Gathering the OIDC server configuration + var res *actions.OIDCResponse + if res, err = actions.NewOIDCConfiguration(logger, client).Handle(viper.GetString(OIDCServer)); err != nil { + return err + } + + pkce := actions.NewCodeVerifier(logger).Handle() + + var url string + url, err = actions.NewAuthenticationURI(logger, viper.GetString(OIDCClientID), pkce, res).Handle() + if err != nil { + return err + } + + fmt.Println("") + fmt.Println("Proceed to login to the following link using your browser:") + fmt.Println("") + fmt.Println(url) + fmt.Println("") + + var code string + reader := bufio.NewReader(os.Stdin) + fmt.Print("Type the verification code: ") + code, _ = reader.ReadString('\n') + code = strings.TrimSuffix(code, "\n") + + logger.Debug("User input code is " + code) + + var token, refresh string + token, refresh, err = actions.NewGetToken(logger, res.TokenEndpoint, viper.GetString(OIDCClientID), code, pkce, client).Handle() + if err != nil { + return fmt.Errorf("cannot proceed to login due to an error: %w", err) + } + + viper.Set(TokenEndpoint, res.TokenEndpoint) + viper.Set(TokenID, token) + viper.Set(TokenRefresh, refresh) + + defer func() { + if err = viper.WriteConfig(); err != nil { + logger.Error("Cannot write configuration file", zap.Error(err)) + } + }() + + config := &v1.Config{ + Kind: "Config", + APIVersion: "v1", + CurrentContext: "oidc", + Clusters: []v1.NamedCluster{ + { + Name: "kubernetes", + Cluster: v1.Cluster{ + Server: viper.GetString(K8SAPIServer), + InsecureSkipTLSVerify: viper.GetBool(K8SSkipTLSVerify), + CertificateAuthorityData: func() (b []byte) { + if viper.GetBool(K8SSkipTLSVerify) { + return nil + } + b, err = afero.ReadFile(afero.NewOsFs(), viper.GetString(K8SCertificateAuthorityPath)) + return + }(), + }, + }, + }, + Contexts: []v1.NamedContext{ + { + Name: "oidc", + Context: v1.Context{ + Cluster: "kubernetes", + AuthInfo: "oidc", + }, + }, + }, + AuthInfos: []v1.NamedAuthInfo{ + { + Name: "oidc", + AuthInfo: v1.AuthInfo{ + Exec: &v1.ExecConfig{ + Command: "kubectl", + Args: []string{"login", tokenCmd.Use}, + APIVersion: "client.authentication.k8s.io/v1beta1", + }, + }, + }, + }, + } + if err != nil { + return fmt.Errorf("cannot read Kubernetes CA from file: %w", err) + } + + scheme := runtime.NewScheme() + e := json.NewSerializerWithOptions(yaml.SimpleMetaFactory{}, scheme, scheme, json.SerializerOptions{ + Yaml: true, + Pretty: true, + Strict: false, + }) + + a := bytes.NewBuffer([]byte{}) + if err = e.Encode(config, a); err != nil { + return fmt.Errorf("cannot encode kubeconfig to YAML (%w)", err) + } + + path, _ := cmd.Flags().GetString("kubeconfig-path") + + if err = afero.WriteFile(afero.NewOsFs(), path, a.Bytes(), os.ModePerm); err != nil { + msg := "cannot save generated kubeconfig" + logger.Error(msg, zap.Error(err)) + return errors.New(msg) + } + + fmt.Println("Your login procedure has been completed!") + fmt.Println("") + fmt.Println("You can start interacting with your Kubernetes cluster using the generated kubeconfig file:") + fmt.Printf("export KUBECONFIG=%s", path) + fmt.Println("") + fmt.Println("") + fmt.Println("Happy Kubernetes interaction!") + + return nil + }, +} + +func Execute() { + if err := rootCmd.Execute(); err != nil { + fmt.Println(err) + os.Exit(1) + } +} + +func init() { + cobra.OnInitialize(initConfig) + + rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.kubectl-login.yaml)") + rootCmd.PersistentFlags().BoolP("verbose", "v", false, "Toggle the verbose logging") + + rootCmd.PersistentFlags().String(flagsMap[OIDCServer], viper.GetString(OIDCServer), "The OIDC server URL to connect to") + rootCmd.PersistentFlags().String(flagsMap[OIDCClientID], viper.GetString(OIDCClientID), "The OIDC client ID provided") + rootCmd.PersistentFlags().Bool(flagsMap[OIDCSkipTLSVerify], viper.GetBool(OIDCSkipTLSVerify), "Disable TLS certificate verification for the OIDC server") + rootCmd.PersistentFlags().String(flagsMap[OIDCCertificateAuthority], viper.GetString(OIDCCertificateAuthority), "Path to the OIDC server certificate authority PEM encoded file") + + rootCmd.PersistentFlags().String(flagsMap[K8SAPIServer], viper.GetString(K8SAPIServer), "Endpoint of the Kubernetes API server to connect to") + rootCmd.PersistentFlags().Bool(flagsMap[K8SSkipTLSVerify], viper.GetBool(K8SSkipTLSVerify), "Disable TLS certificate verification for the Kubernetes API server") + rootCmd.PersistentFlags().String(flagsMap[K8SCertificateAuthorityPath], viper.GetString(K8SCertificateAuthorityPath), "Path to the Kubernetes API server certificate authority PEM encoded file") + + rootCmd.PersistentFlags().String(flagsMap[KubeconfigPath], "oidc.kubeconfig", "Path to the generated kubeconfig file upon resulting login procedure to access the Kubernetes cluster") +} + +// initConfig reads in config file and ENV variables if set. +func initConfig() { + if cfgFile != "" { + // Use config file from the flag. + viper.SetConfigFile(cfgFile) + } else { + // Find home directory. + home, err := homedir.Dir() + if err != nil { + fmt.Println(err) + os.Exit(1) + } + + // Search config in home directory with name ".kubectl-login" (without extension). + viper.AddConfigPath(home) + viper.SetConfigType("yaml") + viper.SetConfigName(".kubectl-login") + + p := path.Join(home, ".kubectl-login.yaml") + if ok, _ := afero.Exists(afero.NewOsFs(), p); !ok { + _ = afero.WriteFile(afero.NewOsFs(), p, []byte{}, os.ModePerm) + } + } + + // If a config file is found, read it in. + if err := viper.ReadInConfig(); err == nil { + logger.Info(fmt.Sprintf("Using config file: %s", viper.ConfigFileUsed())) + } +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..fd1afb9 --- /dev/null +++ b/go.mod @@ -0,0 +1,14 @@ +module github.com/clastix/kubectl-login + +go 1.14 + +require ( + github.com/dgrijalva/jwt-go v3.2.0+incompatible + github.com/mitchellh/go-homedir v1.1.0 + github.com/spf13/afero v1.2.2 + github.com/spf13/cobra v1.1.1 + github.com/spf13/viper v1.7.0 + go.uber.org/zap v1.16.0 + k8s.io/apimachinery v0.20.2 + k8s.io/client-go v0.20.2 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..5d5e10e --- /dev/null +++ b/go.sum @@ -0,0 +1,590 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 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+You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package actions + +import ( + "crypto/rand" + "math/big" + + "go.uber.org/zap" +) + +const dictBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890" + +type CodeVerifier struct { + logger *zap.Logger +} + +func NewCodeVerifier(logger *zap.Logger) *CodeVerifier { + return &CodeVerifier{logger: logger} +} + +func (r CodeVerifier) Handle() (out string) { + b := make([]byte, 128) + + r.logger.Info("Generating PKCE Code Verifier and Challenge") + defer func() { r.logger.Info("PKCE code verifier generated", zap.ByteString("code", b)) }() + + for i := range b { + bi, _ := rand.Int(rand.Reader, big.NewInt(int64(len(dictBytes)))) + b[i] = dictBytes[bi.Int64()] + } + + return string(b) +} diff --git a/internal/actions/create_auth_uri.go b/internal/actions/create_auth_uri.go new file mode 100644 index 0000000..cd7aef1 --- /dev/null +++ b/internal/actions/create_auth_uri.go @@ -0,0 +1,89 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package actions + +import ( + "crypto/rand" + "crypto/sha256" + "encoding/base64" + "net/url" + "regexp" + + "go.uber.org/zap" +) + +type AuthenticationURI struct { + logger *zap.Logger + authEndpoint, oidcClientID, codeVerifier string +} + +func NewAuthenticationURI(logger *zap.Logger, oidcClientID, codeVerifier string, configuration *OIDCResponse) *AuthenticationURI { + return &AuthenticationURI{ + logger: logger, + authEndpoint: configuration.AuthorizationEndpoint, + oidcClientID: oidcClientID, + codeVerifier: codeVerifier, + } +} + +func (r AuthenticationURI) Handle() (authURI string, err error) { + r.logger.Info("Creating authorization URI") + + b := make([]byte, 32) + if _, err = rand.Read(b); err != nil { + r.logger.Error("Cannot read random generate data", zap.Error(err)) + return + } + b64State := base64.URLEncoding.EncodeToString(b) + re := regexp.MustCompile(`[\W_]`) + state := re.ReplaceAllString(b64State, "") + + hash := sha256.Sum256([]byte(r.codeVerifier)) + codeChallenge := base64.RawURLEncoding.EncodeToString(hash[:]) + + var u *url.URL + u, err = url.Parse(r.authEndpoint) + if err != nil { + r.logger.Error("Cannot parse auth endpoint", zap.String("authEndpoint", r.authEndpoint), zap.Error(err)) + return + } + + qs := u.Query() + qs.Set("response_type", "code") + qs.Set("client_id", r.oidcClientID) + qs.Set("redirect_uri", "urn:ietf:wg:oauth:2.0:oob") + qs.Set("scope", "openid+groups+offline_access") + qs.Set("state", state) + qs.Set("prompt", "consent") + qs.Set("code_challenge", codeChallenge) + qs.Set("code_challenge_method", codeChallengeMethod) + qs.Set("access_type", "offline") + + authURL := url.URL{ + Scheme: u.Scheme, + Host: u.Host, + Path: u.Path, + RawPath: u.RawPath, + ForceQuery: true, + RawQuery: func(value string) (out string) { + out, _ = url.QueryUnescape(value) + return + }(qs.Encode()), + } + + return authURL.String(), nil +} diff --git a/internal/actions/get_token.go b/internal/actions/get_token.go new file mode 100644 index 0000000..b843649 --- /dev/null +++ b/internal/actions/get_token.go @@ -0,0 +1,96 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package actions + +import ( + "encoding/json" + "errors" + "io/ioutil" + "net/http" + "net/url" + "strings" + + "go.uber.org/zap" + + "github.com/clastix/kubectl-login/internal/oidc" +) + +type tokenResponse struct { + IDToken string `json:"id_token"` + RefreshToken string `json:"refresh_token"` + Error string `json:"error"` +} + +type GetToken struct { + logger *zap.Logger + client *oidc.HTTPClient + tokenEndpoint, OIDClientID, code, pkceCodeVerifier string +} + +func NewGetToken(logger *zap.Logger, tokenEndpoint, oidcClientID, code, pkceCodeVerifier string, httpClient *oidc.HTTPClient) *GetToken { + return &GetToken{ + logger: logger, + tokenEndpoint: tokenEndpoint, + OIDClientID: oidcClientID, + code: code, + pkceCodeVerifier: pkceCodeVerifier, + client: httpClient, + } +} + +func (r GetToken) Handle() (idToken, refreshToken string, err error) { + d := url.Values{} + d.Add("grant_type", "authorization_code") + d.Add("response_type", "id_token") + d.Add("client_id", r.OIDClientID) + d.Add("code", r.code) + d.Add("code_verifier", r.pkceCodeVerifier) + d.Add("redirect_uri", "urn:ietf:wg:oauth:2.0:oob") + + var tokenURL *url.URL + tokenURL, err = url.Parse(r.tokenEndpoint) + if err != nil { + r.logger.Error("Cannot retrieve OIDC token due to non well-formed endpoint", zap.Error(err), zap.String("tokenEndpoint", r.tokenEndpoint)) + return + } + + var res *http.Response + if res, err = r.client.Post(tokenURL.String(), "application/x-www-form-urlencoded", strings.NewReader(d.Encode())); err != nil { + r.logger.Error("Cannot reach the server", zap.Error(err), zap.String("uri", tokenURL.String())) + return + } + defer func() { _ = res.Body.Close() }() + + var b []byte + if b, err = ioutil.ReadAll(res.Body); err != nil { + r.logger.Error("Cannot read response body", zap.Error(err)) + return + } + p := &tokenResponse{} + if err = json.Unmarshal(b, p); err != nil { + r.logger.Error("Cannot unmarshal JSON response", zap.Error(err)) + return + } + + if len(p.Error) > 0 { + err = errors.New(p.Error) + r.logger.Error("Token retrieval failed", zap.Error(err)) + return + } + + return p.IDToken, p.RefreshToken, nil +} diff --git a/internal/actions/oidc_config.go b/internal/actions/oidc_config.go new file mode 100644 index 0000000..86637cf --- /dev/null +++ b/internal/actions/oidc_config.go @@ -0,0 +1,95 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package actions + +import ( + "encoding/json" + "errors" + "fmt" + "io/ioutil" + "net/http" + + "go.uber.org/zap" + + "github.com/clastix/kubectl-login/internal/oidc" +) + +const ( + codeChallengeMethod = "S256" +) + +type OIDCResponse struct { + AuthorizationEndpoint string `json:"authorization_endpoint"` + TokenEndpoint string `json:"token_endpoint"` + IntrospectionEndpoint string `json:"introspection_endpoint"` + UserInfoEndpoint string `json:"userinfo_endpoint"` + EndSessionEndpoint string `json:"end_session_endpoint"` + GrantTypesSupported []string `json:"grant_types_supported"` + ResponseTypesSupported []string `json:"response_types_supported"` + ResponseModesSupported []string `json:"response_modes_supported"` + ClaimsSupported []string `json:"claims_supported"` + ScopesSupported []string `json:"scopes_supported"` + CodeChallengeMethodsSupported []string `json:"code_challenge_methods_supported"` + Error string `json:"error"` +} + +type PKCELogin struct { + logger *zap.Logger + client *oidc.HTTPClient +} + +func NewOIDCConfiguration(logger *zap.Logger, oidcClient *oidc.HTTPClient) *PKCELogin { + return &PKCELogin{ + logger: logger, + client: oidcClient, + } +} + +func (r PKCELogin) Handle(oidcServer string) (response *OIDCResponse, err error) { + r.logger.Info("Starting OIDC login with PKCE") + + response, err = r.GetOpenIDConfig(oidcServer) + if err != nil { + return + } + + return +} + +func (r PKCELogin) GetOpenIDConfig(oidcServer string) (out *OIDCResponse, err error) { + r.logger.Info("Getting OIDC configuration from the server", zap.String("OIDCServer", oidcServer)) + + var res *http.Response + res, err = r.client.Get(fmt.Sprintf("%s/.well-known/openid-configuration", oidcServer)) + if err != nil { + r.logger.Error("Cannot get OIDC configuration from the server", zap.String("OIDCServer", oidcServer), zap.Error(err)) + return + } + defer func() { _ = res.Body.Close() }() + + out = &OIDCResponse{} + b, _ := ioutil.ReadAll(res.Body) + if err = json.Unmarshal(b, out); err != nil { + r.logger.Error("Cannot unmarshal OIDC configuration", zap.String("OIDCServer", oidcServer), zap.Error(err)) + return + } + if len(out.Error) > 0 { + err = errors.New(out.Error) + } + + return +} diff --git a/internal/actions/refresh_token.go b/internal/actions/refresh_token.go new file mode 100644 index 0000000..63c3281 --- /dev/null +++ b/internal/actions/refresh_token.go @@ -0,0 +1,92 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package actions + +import ( + "crypto/tls" + "encoding/json" + "errors" + "io/ioutil" + "net/http" + "net/url" + "strings" + + "go.uber.org/zap" +) + +type RefreshToken struct { + logger *zap.Logger + client *http.Client + refreshEndpoint, oidcClientID, refreshToken string +} + +func NewRefreshToken(logger *zap.Logger, insecureSkipVerify bool, refreshEndpoint string, oidcClientID string, refreshToken string) *RefreshToken { + return &RefreshToken{ + logger: logger, + oidcClientID: oidcClientID, + refreshEndpoint: refreshEndpoint, + refreshToken: refreshToken, + client: &http.Client{ + Transport: &http.Transport{ + TLSClientConfig: &tls.Config{ + //nolint:gosec + InsecureSkipVerify: insecureSkipVerify, + }, + }, + }, + } +} + +func (r RefreshToken) Handle() (idToken, refresh string, err error) { + d := url.Values{} + d.Add("grant_type", "refresh_token") + d.Add("refresh_token", r.refreshToken) + d.Add("client_id", r.oidcClientID) + + var tokenURL *url.URL + tokenURL, err = url.Parse(r.refreshEndpoint) + if err != nil { + r.logger.Error("Cannot retrieve OIDC token due to non well-formed endpoint", zap.Error(err), zap.String("refreshEndpoint", r.refreshEndpoint)) + return + } + + var res *http.Response + if res, err = r.client.Post(tokenURL.String(), "application/x-www-form-urlencoded", strings.NewReader(d.Encode())); err != nil { + r.logger.Error("Cannot reach the server", zap.Error(err), zap.String("uri", tokenURL.String())) + return + } + defer func() { _ = res.Body.Close() }() + + var b []byte + if b, err = ioutil.ReadAll(res.Body); err != nil { + r.logger.Error("Cannot read response body", zap.Error(err)) + return + } + t := &tokenResponse{} + if err = json.Unmarshal(b, t); err != nil { + r.logger.Error("Cannot unmarshal JSON response", zap.Error(err)) + return + } + + if len(t.Error) > 0 { + err = errors.New(t.Error) + r.logger.Error("Token retrieval failed", zap.Error(err)) + return + } + + return t.IDToken, t.RefreshToken, nil +} diff --git a/internal/oidc/oidc_client.go b/internal/oidc/oidc_client.go new file mode 100644 index 0000000..c0509c8 --- /dev/null +++ b/internal/oidc/oidc_client.go @@ -0,0 +1,82 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +package oidc + +import ( + "crypto/tls" + "crypto/x509" + "fmt" + "net/http" + + "github.com/spf13/afero" +) + +type CAReadFileError struct { + error error +} + +func (r CAReadFileError) Error() string { + return fmt.Sprintf("Cannot read OIDC Certificate Authority file: %s", r.error.Error()) +} + +func NewCAReadFileError(error error) error { + return &CAReadFileError{error: error} +} + +type CAPoolError struct { +} + +func (CAPoolError) Error() string { + return "Cannot create CA Pool from PEM" +} + +func NewOIDCCAPoolError() error { + return &CAPoolError{} +} + +type HTTPClient struct { + http.Client +} + +func NewHTTPClient(certificateAuthorityPath string, insecureSkipVerify bool) (client *HTTPClient, err error) { + return &HTTPClient{ + Client: http.Client{ + Transport: &http.Transport{ + TLSClientConfig: &tls.Config{ + //nolint:gosec + InsecureSkipVerify: insecureSkipVerify, + RootCAs: func() (pool *x509.CertPool) { + if len(certificateAuthorityPath) == 0 { + return nil + } + b, e := afero.ReadFile(afero.NewOsFs(), certificateAuthorityPath) + if e != nil { + err = NewCAReadFileError(e) + return nil + } + pool = x509.NewCertPool() + if !pool.AppendCertsFromPEM(b) { + err = NewOIDCCAPoolError() + return nil + } + return + }(), + }, + }, + }, + }, err +} diff --git a/main.go b/main.go new file mode 100644 index 0000000..3a55c4e --- /dev/null +++ b/main.go @@ -0,0 +1,22 @@ +/* +Copyright © 2021 Clastix Labs + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ +package main + +import "github.com/clastix/kubectl-login/cmd" + +func main() { + cmd.Execute() +} diff --git a/scripts/kubectl-login b/scripts/kubectl-login index 36cc2fe..f95cbb8 100755 --- a/scripts/kubectl-login +++ b/scripts/kubectl-login @@ -2,7 +2,7 @@ # An OIDC Identity Provider issues you three types of tokens: # - refresh-token -# - id-token +# - id-token # - access-token # The access-token can generally be disregarded for Kubernetes. # It would be used if the Identity Provider was managing roles and permissions, @@ -102,9 +102,9 @@ gen_pkce() { echo "[$(date)][INFO] Generating PKCE Code Verifier and Challenge" # Length of code_verifier should be no less than 43 characters and no more than 128 characters, # and Base64URL encoded - CODE_VERIFIER=`openssl rand -base64 50 | tr -dc A-Za-z0-9` + CODE_VERIFIER=`openssl rand -base64 50 | tr -dc A-Za-z0-9` # challenge = base64url(sha256(code_verifier)) - CODE_CHALLENGE=`echo -n ${CODE_VERIFIER} | shasum -a 256 | cut -d " " -f 1 | xxd -r -p | base64 | tr / _ | tr + - | tr -d =` + CODE_CHALLENGE=`echo -n ${CODE_VERIFIER} | sha256sum | cut -d " " -f 1 | xxd -r -p | base64 | tr / _ | tr + - | tr -d =` } create_auth_uri() { @@ -148,7 +148,7 @@ get_token() { # We should set a configuration option to distinguish if # the OIDC_CLIENT_SECRET is necessary (confidential client) or not (public client) # -d client_secret=$OIDC_CLIENT_SECRET - + TOKEN=`curl -k -s $TOKEN_ENDPOINT \ -d grant_type=authorization_code \ -d response_type=id_token \ @@ -267,7 +267,7 @@ token() { TOKEN=`cat ${CACHE}` ID_TOKEN=`echo ${TOKEN} | jq .id_token -r` local exp=$(exp_jwt $ID_TOKEN) - local timestamp=$(date -r $exp +%FT%TZ) + #local timestamp=$(date -R $exp +%FT%TZ) if [ $(date +%s) -ge $exp ]; then # refreshing the token from server" @@ -289,7 +289,7 @@ token() { ID_TOKEN=`echo ${TOKEN} | jq .id_token -r` fi # return the id_token to kubectl - echo '{"apiVersion": "client.authentication.k8s.io/v1beta1", "kind": "ExecCredential", "status": {"token": "'${ID_TOKEN}'", "expirationTimestamp": "'${timestamp}'"}}' + echo '{"apiVersion": "client.authentication.k8s.io/v1beta1", "kind": "ExecCredential", "status": {"token": "'${ID_TOKEN}'"}}' else echo "[$(date)][INFO] Refresh the token." >&2 echo "[$(date)][INFO] Open a terminal and run: kubectl oidc --login" >&2