├── .gitignore ├── CONTRIBUTING.md ├── Gopkg.lock ├── Gopkg.toml ├── LICENSE ├── README.md ├── main.go └── templates.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.dll 4 | *.so 5 | *.dylib 6 | 7 | # Test binary, build with `go test -c` 8 | *.test 9 | 10 | # Output of the go coverage tool, specifically when used with LiteIDE 11 | *.out 12 | 13 | # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736 14 | .glide/ 15 | 16 | # Do not check in vendored dependencies 17 | vendor/ 18 | -------------------------------------------------------------------------------- /CONTRIBUTING.md: -------------------------------------------------------------------------------- 1 | # Contributing 2 | To develop on this project, please fork the repo and clone into your `$GOPATH`. 3 | 4 | Dependencies are **not** checked in so please download those separately. 5 | Download the dependencies using [`dep`](https://github.com/golang/dep). 6 | 7 | ```bash 8 | cd $GOPATH/src/github.com # Create this directory if it doesn't exist 9 | git clone git@github.com:/k8s-auth-example pusher/k8s-auth-example 10 | dep ensure # Installs dependencies to vendor folder. 11 | ``` 12 | 13 | ## Pull Requests and Issues 14 | We track bugs and issues using Github . 15 | 16 | If you find a bug, please open an Issue. 17 | 18 | If you want to fix a bug, please fork, fix the bug and open a PR back to this repo. 19 | Please mention the open bug issue number within your PR if applicable. 20 | -------------------------------------------------------------------------------- /Gopkg.lock: -------------------------------------------------------------------------------- 1 | # This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'. 2 | 3 | 4 | [[projects]] 5 | name = "github.com/PuerkitoBio/purell" 6 | packages = ["."] 7 | revision = "0bcb03f4b4d0a9428594752bd2a3b9aa0a9d4bd4" 8 | version = "v1.1.0" 9 | 10 | [[projects]] 11 | branch = "master" 12 | name = "github.com/PuerkitoBio/urlesc" 13 | packages = ["."] 14 | revision = "de5bf2ad457846296e2031421a34e2568e304e35" 15 | 16 | [[projects]] 17 | branch = "master" 18 | name = "github.com/coreos/go-oidc" 19 | packages = ["."] 20 | revision = "a4973d9a4225417aecf5d450a9522f00c1f7130f" 21 | 22 | [[projects]] 23 | name = "github.com/emicklei/go-restful" 24 | packages = [".","log"] 25 | revision = "5741799b275a3c4a5a9623a993576d7545cf7b5c" 26 | version = "v2.4.0" 27 | 28 | [[projects]] 29 | name = "github.com/fatih/structs" 30 | packages = ["."] 31 | revision = "a720dfa8df582c51dee1b36feabb906bde1588bd" 32 | version = "v1.0" 33 | 34 | [[projects]] 35 | name = "github.com/ghodss/yaml" 36 | packages = ["."] 37 | revision = "0ca9ea5df5451ffdf184b4428c902747c2c11cd7" 38 | version = "v1.0.0" 39 | 40 | [[projects]] 41 | branch = "master" 42 | name = "github.com/go-openapi/jsonpointer" 43 | packages = ["."] 44 | revision = "779f45308c19820f1a69e9a4cd965f496e0da10f" 45 | 46 | [[projects]] 47 | branch = "master" 48 | name = "github.com/go-openapi/jsonreference" 49 | packages = ["."] 50 | revision = "36d33bfe519efae5632669801b180bf1a245da3b" 51 | 52 | [[projects]] 53 | branch = "master" 54 | name = "github.com/go-openapi/spec" 55 | packages = ["."] 56 | revision = "7abd5745472fff5eb3685386d5fb8bf38683154d" 57 | 58 | [[projects]] 59 | branch = "master" 60 | name = "github.com/go-openapi/swag" 61 | packages = ["."] 62 | revision = "f3f9494671f93fcff853e3c6e9e948b3eb71e590" 63 | 64 | [[projects]] 65 | name = "github.com/gogo/protobuf" 66 | packages = ["proto","sortkeys"] 67 | revision = "100ba4e885062801d56799d78530b73b178a78f3" 68 | version = "v0.4" 69 | 70 | [[projects]] 71 | branch = "master" 72 | name = "github.com/golang/glog" 73 | packages = ["."] 74 | revision = "23def4e6c14b4da8ac2ed8007337bc5eb5007998" 75 | 76 | [[projects]] 77 | branch = "master" 78 | name = "github.com/golang/protobuf" 79 | packages = ["proto"] 80 | revision = "130e6b02ab059e7b717a096f397c5b60111cae74" 81 | 82 | [[projects]] 83 | branch = "master" 84 | name = "github.com/golang/snappy" 85 | packages = ["."] 86 | revision = "553a641470496b2327abcac10b36396bd98e45c9" 87 | 88 | [[projects]] 89 | branch = "master" 90 | name = "github.com/google/btree" 91 | packages = ["."] 92 | revision = "316fb6d3f031ae8f4d457c6c5186b9e3ded70435" 93 | 94 | [[projects]] 95 | branch = "master" 96 | name = "github.com/google/gofuzz" 97 | packages = ["."] 98 | revision = "24818f796faf91cd76ec7bddd72458fbced7a6c1" 99 | 100 | [[projects]] 101 | branch = "master" 102 | name = "github.com/gregjones/httpcache" 103 | packages = [".","diskcache"] 104 | revision = "c1f8028e62adb3d518b823a2f8e6a95c38bdd3aa" 105 | 106 | [[projects]] 107 | branch = "master" 108 | name = "github.com/hashicorp/errwrap" 109 | packages = ["."] 110 | revision = "7554cd9344cec97297fa6649b055a8c98c2a1e55" 111 | 112 | [[projects]] 113 | branch = "master" 114 | name = "github.com/hashicorp/go-cleanhttp" 115 | packages = ["."] 116 | revision = "3573b8b52aa7b37b9358d966a898feb387f62437" 117 | 118 | [[projects]] 119 | branch = "master" 120 | name = "github.com/hashicorp/go-multierror" 121 | packages = ["."] 122 | revision = "83588e72410abfbe4df460eeb6f30841ae47d4c4" 123 | 124 | [[projects]] 125 | branch = "master" 126 | name = "github.com/hashicorp/go-rootcerts" 127 | packages = ["."] 128 | revision = "6bb64b370b90e7ef1fa532be9e591a81c3493e00" 129 | 130 | [[projects]] 131 | branch = "master" 132 | name = "github.com/hashicorp/hcl" 133 | packages = [".","hcl/ast","hcl/parser","hcl/scanner","hcl/strconv","hcl/token","json/parser","json/scanner","json/token"] 134 | revision = "68e816d1c783414e79bc65b3994d9ab6b0a722ab" 135 | 136 | [[projects]] 137 | name = "github.com/hashicorp/vault" 138 | packages = ["api","helper/compressutil","helper/jsonutil","helper/parseutil"] 139 | revision = "6b29fb2b7f70ed538ee2b3c057335d706b6d4e36" 140 | version = "v0.8.3" 141 | 142 | [[projects]] 143 | branch = "master" 144 | name = "github.com/howeyc/gopass" 145 | packages = ["."] 146 | revision = "bf9dde6d0d2c004a008c27aaee91170c786f6db8" 147 | 148 | [[projects]] 149 | name = "github.com/imdario/mergo" 150 | packages = ["."] 151 | revision = "3e95a51e0639b4cf372f2ccf74c86749d747fbdc" 152 | version = "0.2.2" 153 | 154 | [[projects]] 155 | name = "github.com/inconshreveable/mousetrap" 156 | packages = ["."] 157 | revision = "76626ae9c91c4f2a10f34cad8ce83ea42c93bb75" 158 | version = "v1.0" 159 | 160 | [[projects]] 161 | name = "github.com/json-iterator/go" 162 | packages = ["."] 163 | revision = "6ed27152e0428abfde127acb33b08b03a1e67cac" 164 | version = "1.0.2" 165 | 166 | [[projects]] 167 | branch = "master" 168 | name = "github.com/juju/ratelimit" 169 | packages = ["."] 170 | revision = "5b9ff866471762aa2ab2dced63c9fb6f53921342" 171 | 172 | [[projects]] 173 | branch = "master" 174 | name = "github.com/mailru/easyjson" 175 | packages = ["buffer","jlexer","jwriter"] 176 | revision = "2a92e673c9a6302dd05c3a691ae1f24aef46457d" 177 | 178 | [[projects]] 179 | branch = "master" 180 | name = "github.com/mitchellh/go-homedir" 181 | packages = ["."] 182 | revision = "b8bc1bf767474819792c23f32d8286a45736f1c6" 183 | 184 | [[projects]] 185 | branch = "master" 186 | name = "github.com/mitchellh/mapstructure" 187 | packages = ["."] 188 | revision = "d0303fe809921458f417bcf828397a65db30a7e4" 189 | 190 | [[projects]] 191 | branch = "master" 192 | name = "github.com/petar/GoLLRB" 193 | packages = ["llrb"] 194 | revision = "53be0d36a84c2a886ca057d34b6aa4468df9ccb4" 195 | 196 | [[projects]] 197 | name = "github.com/peterbourgon/diskv" 198 | packages = ["."] 199 | revision = "5f041e8faa004a95c88a202771f4cc3e991971e6" 200 | version = "v2.0.1" 201 | 202 | [[projects]] 203 | branch = "master" 204 | name = "github.com/pquerna/cachecontrol" 205 | packages = [".","cacheobject"] 206 | revision = "5475d973ea70916980bee28c2b674f3dc3eaed0a" 207 | 208 | [[projects]] 209 | branch = "master" 210 | name = "github.com/sethgrid/pester" 211 | packages = ["."] 212 | revision = "0af5bab1e1ea2860c5aef8e77427bab011d774d8" 213 | 214 | [[projects]] 215 | branch = "master" 216 | name = "github.com/spf13/cobra" 217 | packages = ["."] 218 | revision = "b78744579491c1ceeaaa3b40205e56b0591b93a3" 219 | 220 | [[projects]] 221 | name = "github.com/spf13/pflag" 222 | packages = ["."] 223 | revision = "e57e3eeb33f795204c1ca35f56c44f83227c6e66" 224 | version = "v1.0.0" 225 | 226 | [[projects]] 227 | branch = "master" 228 | name = "golang.org/x/crypto" 229 | packages = ["ed25519","ed25519/internal/edwards25519","ssh/terminal"] 230 | revision = "c84b36c635ad003a10f0c755dff5685ceef18c71" 231 | 232 | [[projects]] 233 | branch = "master" 234 | name = "golang.org/x/net" 235 | packages = ["context","context/ctxhttp","http2","http2/hpack","idna","lex/httplex"] 236 | revision = "0a9397675ba34b2845f758fe3cd68828369c6517" 237 | 238 | [[projects]] 239 | branch = "master" 240 | name = "golang.org/x/oauth2" 241 | packages = [".","internal"] 242 | revision = "bb50c06baba3d0c76f9d125c0719093e315b5b44" 243 | 244 | [[projects]] 245 | branch = "master" 246 | name = "golang.org/x/sys" 247 | packages = ["unix","windows"] 248 | revision = "314a259e304ff91bd6985da2a7149bbf91237993" 249 | 250 | [[projects]] 251 | branch = "master" 252 | name = "golang.org/x/text" 253 | packages = ["collate","collate/build","internal/colltab","internal/gen","internal/tag","internal/triegen","internal/ucd","language","secure/bidirule","transform","unicode/bidi","unicode/cldr","unicode/norm","unicode/rangetable","width"] 254 | revision = "1cbadb444a806fd9430d14ad08967ed91da4fa0a" 255 | 256 | [[projects]] 257 | name = "google.golang.org/appengine" 258 | packages = ["internal","internal/base","internal/datastore","internal/log","internal/remote_api","internal/urlfetch","urlfetch"] 259 | revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a" 260 | version = "v1.0.0" 261 | 262 | [[projects]] 263 | name = "gopkg.in/inf.v0" 264 | packages = ["."] 265 | revision = "3887ee99ecf07df5b447e9b00d9c0b2adaa9f3e4" 266 | version = "v0.9.0" 267 | 268 | [[projects]] 269 | name = "gopkg.in/square/go-jose.v2" 270 | packages = [".","cipher","json"] 271 | revision = "f8f38de21b4dcd69d0413faf231983f5fd6634b1" 272 | version = "v2.1.3" 273 | 274 | [[projects]] 275 | branch = "v2" 276 | name = "gopkg.in/yaml.v2" 277 | packages = ["."] 278 | revision = "eb3733d160e74a9c7e442f435eb3bea458e1d19f" 279 | 280 | [[projects]] 281 | branch = "master" 282 | name = "k8s.io/api" 283 | packages = ["core/v1"] 284 | revision = "81aa34336d28aadc3a8e8da7dfd9258c5157e5e4" 285 | 286 | [[projects]] 287 | branch = "master" 288 | name = "k8s.io/apimachinery" 289 | packages = ["pkg/api/errors","pkg/api/resource","pkg/apis/meta/v1","pkg/conversion","pkg/conversion/queryparams","pkg/fields","pkg/labels","pkg/runtime","pkg/runtime/schema","pkg/runtime/serializer/json","pkg/runtime/serializer/recognizer","pkg/runtime/serializer/streaming","pkg/runtime/serializer/versioning","pkg/selection","pkg/types","pkg/util/clock","pkg/util/errors","pkg/util/framer","pkg/util/intstr","pkg/util/net","pkg/util/runtime","pkg/util/sets","pkg/util/validation","pkg/util/validation/field","pkg/util/wait","pkg/util/yaml","pkg/version","pkg/watch","third_party/forked/golang/reflect"] 290 | revision = "3b05bbfa0a45413bfa184edbf9af617e277962fb" 291 | 292 | [[projects]] 293 | branch = "master" 294 | name = "k8s.io/client-go" 295 | packages = ["pkg/version","rest","rest/watch","tools/auth","tools/clientcmd","tools/clientcmd/api","tools/clientcmd/api/latest","tools/clientcmd/api/v1","tools/metrics","transport","util/cert","util/flowcontrol","util/homedir","util/integer"] 296 | revision = "82aa063804cf055e16e8911250f888bc216e8b61" 297 | 298 | [[projects]] 299 | branch = "master" 300 | name = "k8s.io/kube-openapi" 301 | packages = ["pkg/common"] 302 | revision = "abfc5fbe1cf87ee697db107fdfd24c32fe4397a8" 303 | 304 | [solve-meta] 305 | analyzer-name = "dep" 306 | analyzer-version = 1 307 | inputs-digest = "cd3b41ba8f565eb08214ea24e5db1be5ae05b7197a6222bdabb22eced388f544" 308 | solver-name = "gps-cdcl" 309 | solver-version = 1 310 | -------------------------------------------------------------------------------- /Gopkg.toml: -------------------------------------------------------------------------------- 1 | 2 | # Gopkg.toml example 3 | # 4 | # Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md 5 | # for detailed Gopkg.toml documentation. 6 | # 7 | # required = ["github.com/user/thing/cmd/thing"] 8 | # ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"] 9 | # 10 | # [[constraint]] 11 | # name = "github.com/user/project" 12 | # version = "1.0.0" 13 | # 14 | # [[constraint]] 15 | # name = "github.com/user/project2" 16 | # branch = "dev" 17 | # source = "github.com/myfork/project2" 18 | # 19 | # [[override]] 20 | # name = "github.com/x/y" 21 | # version = "2.4.0" 22 | 23 | 24 | [[constraint]] 25 | branch = "master" 26 | name = "github.com/coreos/go-oidc" 27 | 28 | [[constraint]] 29 | branch = "master" 30 | name = "github.com/spf13/cobra" 31 | 32 | [[constraint]] 33 | branch = "master" 34 | name = "golang.org/x/oauth2" 35 | 36 | [[constraint]] 37 | branch = "master" 38 | name = "k8s.io/client-go" 39 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. Definitions. 8 | 9 | "License" shall mean the terms and conditions for use, reproduction, 10 | and distribution as defined by Sections 1 through 9 of this document. 11 | 12 | "Licensor" shall mean the copyright owner or entity authorized by 13 | the copyright owner that is granting the License. 14 | 15 | "Legal Entity" shall mean the union of the acting entity and all 16 | other entities that control, are controlled by, or are under common 17 | control with that entity. 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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Kubernetes Authentication Example 2 | This code is provided verbatim as an example of how to connect to an OIDC 3 | provider and authenticate users before configuring their `kubeconfig`. 4 | 5 | At [Pusher](https://pusher.com), we distribute a copy of this app to our engineers 6 | which sources all required information from Vault and configures their cluster 7 | contexts as well. 8 | 9 | You may also wish to build your own version of this app, sourcing it's 10 | configuration automatically, to improve your user-experience. 11 | 12 | ## Attribution 13 | This project started life as the [Dex example app](https://github.com/coreos/dex/tree/master/cmd/example-app). 14 | 15 | ## Usage 16 | You will need to configure an OIDC application with your Identity Provider. 17 | 18 | The redirect URI should be `http://127.0.0.1:5555/callback` and you will need to 19 | make a note of the issuer URL and the client secret that you set/are given. 20 | 21 | We use Dex so I've included an example Dex config snippet below: 22 | ``` 23 | staticClients: 24 | - id: kubernetes 25 | redirectURIs: 26 | - 'http://127.0.0.1:5555/callback' 27 | name: 'Kubernetes API' 28 | secret: c3VwZXJzZWNyZXRzdHJpbmcK 29 | ``` 30 | 31 | With this configuration, and a Dex instance running at https://auth.exmaple.com/dex, 32 | the following command will initiate the login flow: 33 | ``` 34 | ./k8s-auth-example --client-secret c3VwZXJzZWNyZXRzdHJpbmcK --client-id kubernetes --issuer https://auth.exmaple.com/dex 35 | ``` 36 | 37 | ## Building 38 | The application is written in Go using [`dep`](https://github.com/golang/dep) 39 | as the package manager. The following will get you your first build: 40 | 41 | ``` 42 | go get git@github.com/pusher/k8s-auth-example 43 | cd $GOPATH/src/github.com/pusher/k8s-auth-example 44 | dep ensure 45 | go build -o k8s-auth 46 | ``` 47 | 48 | ## Communication 49 | 50 | * Found a bug? Please open an issue. 51 | * Have a feature request. Please open an issue. 52 | * If you want to contribute, please submit a pull request 53 | 54 | ## Contributing 55 | Please see our [Contributing](CONTRIBUTING.md) guidelines. 56 | 57 | ## License 58 | This project is licensed under Apache 2.0 and a copy of the license is available [here](LICENSE). 59 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "bytes" 5 | "context" 6 | "crypto/tls" 7 | "crypto/x509" 8 | "encoding/json" 9 | "fmt" 10 | "io/ioutil" 11 | "log" 12 | "net" 13 | "net/http" 14 | "net/http/httputil" 15 | "net/url" 16 | "os" 17 | "os/exec" 18 | "os/signal" 19 | "runtime" 20 | "syscall" 21 | "time" 22 | 23 | k8s_client "k8s.io/client-go/tools/clientcmd" 24 | k8s_api "k8s.io/client-go/tools/clientcmd/api" 25 | 26 | "github.com/coreos/go-oidc" 27 | "github.com/spf13/cobra" 28 | "golang.org/x/oauth2" 29 | ) 30 | 31 | const ( 32 | exampleAppState = "login" 33 | ) 34 | 35 | type app struct { 36 | clientID string 37 | clientSecret string 38 | redirectURI string 39 | kubeconfig string 40 | debug bool 41 | 42 | verifier *oidc.IDTokenVerifier 43 | provider *oidc.Provider 44 | 45 | // Does the provider use "offline_access" scope to request a refresh token 46 | // or does it use "access_type=offline" (e.g. Google)? 47 | offlineAsScope bool 48 | 49 | client *http.Client 50 | shutdownChan chan bool 51 | } 52 | 53 | type claim struct { 54 | Iss string `json:"iss"` 55 | Sub string `json:"sub"` 56 | Aud string `json:"aud"` 57 | Exp int `json:"exp"` 58 | Iat int `json:"iat"` 59 | AtHash string `json:"at_hash"` 60 | Email string `json:"email"` 61 | EmailVerified bool `json:"email_verified"` 62 | Name string `json:"name"` 63 | } 64 | 65 | // return an HTTP client which trusts the provided root CAs. 66 | func httpClientForRootCAs(rootCAs string) (*http.Client, error) { 67 | tlsConfig := tls.Config{RootCAs: x509.NewCertPool()} 68 | rootCABytes, err := ioutil.ReadFile(rootCAs) 69 | if err != nil { 70 | return nil, fmt.Errorf("failed to read root-ca: %v", err) 71 | } 72 | if !tlsConfig.RootCAs.AppendCertsFromPEM(rootCABytes) { 73 | return nil, fmt.Errorf("no certs found in root CA file %q", rootCAs) 74 | } 75 | return &http.Client{ 76 | Transport: &http.Transport{ 77 | TLSClientConfig: &tlsConfig, 78 | Proxy: http.ProxyFromEnvironment, 79 | Dial: (&net.Dialer{ 80 | Timeout: 30 * time.Second, 81 | KeepAlive: 30 * time.Second, 82 | }).Dial, 83 | TLSHandshakeTimeout: 10 * time.Second, 84 | ExpectContinueTimeout: 1 * time.Second, 85 | }, 86 | }, nil 87 | } 88 | 89 | type debugTransport struct { 90 | t http.RoundTripper 91 | } 92 | 93 | func (d debugTransport) RoundTrip(req *http.Request) (*http.Response, error) { 94 | reqDump, err := httputil.DumpRequest(req, true) 95 | if err != nil { 96 | return nil, err 97 | } 98 | log.Printf("%s", reqDump) 99 | 100 | resp, err := d.t.RoundTrip(req) 101 | if err != nil { 102 | return nil, err 103 | } 104 | 105 | respDump, err := httputil.DumpResponse(resp, true) 106 | if err != nil { 107 | resp.Body.Close() 108 | return nil, err 109 | } 110 | log.Printf("%s", respDump) 111 | return resp, nil 112 | } 113 | 114 | func cmd() *cobra.Command { 115 | var ( 116 | a app 117 | issuerURL string 118 | listen string 119 | tlsCert string 120 | tlsKey string 121 | rootCAs string 122 | ) 123 | c := cobra.Command{ 124 | Use: "k8s-auth", 125 | Short: "Authenticates users against OIDC and writes the required kubeconfig.", 126 | Long: "", 127 | RunE: func(cmd *cobra.Command, args []string) error { 128 | u, err := url.Parse(a.redirectURI) 129 | if err != nil { 130 | return fmt.Errorf("parse redirect-uri: %v", err) 131 | } 132 | listenURL, err := url.Parse(listen) 133 | if err != nil { 134 | return fmt.Errorf("parse listen address: %v", err) 135 | } 136 | 137 | if rootCAs != "" { 138 | client, cErr := httpClientForRootCAs(rootCAs) 139 | if cErr != nil { 140 | return cErr 141 | } 142 | a.client = client 143 | } 144 | 145 | if a.debug { 146 | if a.client == nil { 147 | a.client = &http.Client{ 148 | Transport: debugTransport{http.DefaultTransport}, 149 | } 150 | } else { 151 | a.client.Transport = debugTransport{a.client.Transport} 152 | } 153 | } 154 | 155 | if a.client == nil { 156 | a.client = http.DefaultClient 157 | } 158 | 159 | ctx := oidc.ClientContext(context.Background(), a.client) 160 | provider, err := oidc.NewProvider(ctx, issuerURL) 161 | if err != nil { 162 | return fmt.Errorf("Failed to query provider %q: %v", issuerURL, err) 163 | } 164 | 165 | var s struct { 166 | // What scopes does a provider support? 167 | // 168 | // See: https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata 169 | ScopesSupported []string `json:"scopes_supported"` 170 | } 171 | if err := provider.Claims(&s); err != nil { 172 | return fmt.Errorf("Failed to parse provider scopes_supported: %v", err) 173 | } 174 | 175 | if len(s.ScopesSupported) == 0 { 176 | // scopes_supported is a "RECOMMENDED" discovery claim, not a required 177 | // one. If missing, assume that the provider follows the spec and has 178 | // an "offline_access" scope. 179 | a.offlineAsScope = true 180 | } else { 181 | // See if scopes_supported has the "offline_access" scope. 182 | a.offlineAsScope = func() bool { 183 | for _, scope := range s.ScopesSupported { 184 | if scope == oidc.ScopeOfflineAccess { 185 | return true 186 | } 187 | } 188 | return false 189 | }() 190 | } 191 | 192 | a.provider = provider 193 | a.verifier = provider.Verifier(&oidc.Config{ClientID: a.clientID}) 194 | a.shutdownChan = make(chan bool) 195 | 196 | http.HandleFunc("/", a.handleLogin) 197 | http.HandleFunc(u.Path, a.handleCallback) 198 | 199 | switch listenURL.Scheme { 200 | case "http": 201 | log.Printf("listening on %s", listen) 202 | go open(listen) 203 | go a.waitShutdown() 204 | return http.ListenAndServe(listenURL.Host, nil) 205 | case "https": 206 | log.Printf("listening on %s", listen) 207 | go open(listen) 208 | go a.waitShutdown() 209 | return http.ListenAndServeTLS(listenURL.Host, tlsCert, tlsKey, nil) 210 | default: 211 | return fmt.Errorf("listen address %q is not using http or https", listen) 212 | } 213 | }, 214 | } 215 | 216 | // Configurable variables 217 | c.Flags().StringVar(&a.clientID, "client-id", "kubernetes", "OAuth2 client ID of this application.") 218 | c.Flags().StringVar(&a.clientSecret, "client-secret", "c3VwZXJzZWNyZXRzdHJpbmcK", "OAuth2 client secret of this application.") 219 | c.Flags().StringVar(&a.redirectURI, "redirect-uri", "http://127.0.0.1:5555/callback", "Callback URL for OAuth2 responses.") 220 | c.Flags().StringVar(&issuerURL, "issuer", "http://127.0.0.1:5556/dex", "URL of the OpenID Connect issuer.") 221 | c.Flags().StringVar(&listen, "listen", "http://127.0.0.1:5555", "HTTP(S) address to listen at.") 222 | c.Flags().StringVar(&tlsCert, "tls-cert", "", "X509 cert file to present when serving HTTPS.") 223 | c.Flags().StringVar(&tlsKey, "tls-key", "", "Private key for the HTTPS cert.") 224 | c.Flags().StringVar(&rootCAs, "issuer-root-ca", "", "Root certificate authorities for the issuer. Defaults to host certs.") 225 | c.Flags().BoolVar(&a.debug, "debug", false, "Print all request and responses from the OpenID Connect issuer.") 226 | c.Flags().StringVar(&a.kubeconfig, "kubeconfig", "", "Kubeconfig file to configure") 227 | return &c 228 | } 229 | 230 | func main() { 231 | if err := cmd().Execute(); err != nil { 232 | fmt.Fprintf(os.Stderr, "error: %v\n", err) 233 | os.Exit(2) 234 | } 235 | } 236 | 237 | func (a *app) oauth2Config(scopes []string) *oauth2.Config { 238 | return &oauth2.Config{ 239 | ClientID: a.clientID, 240 | ClientSecret: a.clientSecret, 241 | Endpoint: a.provider.Endpoint(), 242 | Scopes: scopes, 243 | RedirectURL: a.redirectURI, 244 | } 245 | } 246 | 247 | func (a *app) handleLogin(w http.ResponseWriter, r *http.Request) { 248 | var scopes []string 249 | 250 | var authCodeURL string 251 | scopes = append(scopes, "groups", "openid", "profile", "email") 252 | if a.offlineAsScope { 253 | scopes = append(scopes, "offline_access") 254 | authCodeURL = a.oauth2Config(scopes).AuthCodeURL(exampleAppState) 255 | } else { 256 | authCodeURL = a.oauth2Config(scopes).AuthCodeURL(exampleAppState, oauth2.AccessTypeOffline) 257 | } 258 | 259 | http.Redirect(w, r, authCodeURL, http.StatusSeeOther) 260 | } 261 | 262 | func (a *app) handleCallback(w http.ResponseWriter, r *http.Request) { 263 | var ( 264 | err error 265 | token *oauth2.Token 266 | ) 267 | 268 | ctx := oidc.ClientContext(r.Context(), a.client) 269 | oauth2Config := a.oauth2Config(nil) 270 | switch r.Method { 271 | case "GET": 272 | // Authorization redirect callback from OAuth2 auth flow. 273 | if errMsg := r.FormValue("error"); errMsg != "" { 274 | http.Error(w, errMsg+": "+r.FormValue("error_description"), http.StatusBadRequest) 275 | return 276 | } 277 | code := r.FormValue("code") 278 | if code == "" { 279 | http.Error(w, fmt.Sprintf("no code in request: %q", r.Form), http.StatusBadRequest) 280 | return 281 | } 282 | if state := r.FormValue("state"); state != exampleAppState { 283 | http.Error(w, fmt.Sprintf("expected state %q got %q", exampleAppState, state), http.StatusBadRequest) 284 | return 285 | } 286 | token, err = oauth2Config.Exchange(ctx, code) 287 | case "POST": 288 | // Form request from frontend to refresh a token. 289 | refresh := r.FormValue("refresh_token") 290 | if refresh == "" { 291 | http.Error(w, fmt.Sprintf("no refresh_token in request: %q", r.Form), http.StatusBadRequest) 292 | return 293 | } 294 | t := &oauth2.Token{ 295 | RefreshToken: refresh, 296 | Expiry: time.Now().Add(-time.Hour), 297 | } 298 | token, err = oauth2Config.TokenSource(ctx, t).Token() 299 | default: 300 | http.Error(w, fmt.Sprintf("method not implemented: %s", r.Method), http.StatusBadRequest) 301 | return 302 | } 303 | 304 | if err != nil { 305 | http.Error(w, fmt.Sprintf("failed to get token: %v", err), http.StatusInternalServerError) 306 | return 307 | } 308 | 309 | rawIDToken, ok := token.Extra("id_token").(string) 310 | if !ok { 311 | http.Error(w, "no id_token in token response", http.StatusInternalServerError) 312 | return 313 | } 314 | 315 | idToken, err := a.verifier.Verify(r.Context(), rawIDToken) 316 | if err != nil { 317 | http.Error(w, fmt.Sprintf("Failed to verify ID token: %v", err), http.StatusInternalServerError) 318 | return 319 | } 320 | var claims json.RawMessage 321 | idToken.Claims(&claims) 322 | 323 | buff := new(bytes.Buffer) 324 | json.Indent(buff, []byte(claims), "", " ") 325 | var m claim 326 | err = json.Unmarshal(claims, &m) 327 | if err != nil { 328 | http.Error(w, fmt.Sprintf("Failed to read claims: %v", err), http.StatusInternalServerError) 329 | go func() { 330 | a.shutdownChan <- true 331 | }() 332 | return 333 | } 334 | 335 | err = updateKubeConfig(rawIDToken, token.RefreshToken, m, a) 336 | if err != nil { 337 | http.Error(w, fmt.Sprintf("Failed to update kubeconfig: %v", err), http.StatusInternalServerError) 338 | go func() { 339 | a.shutdownChan <- true 340 | }() 341 | return 342 | } 343 | 344 | renderToken(w, a.redirectURI, rawIDToken, token.RefreshToken, buff.Bytes(), a.debug) 345 | fmt.Printf("Login Succeeded as %s\n", m.Email) 346 | if a.debug { 347 | fmt.Printf("ID Token: %s\n", rawIDToken) 348 | fmt.Printf("Refresh Token: %s\n", token.RefreshToken) 349 | fmt.Printf("Claims: %s\n", string(claims)) 350 | } 351 | 352 | go func() { 353 | a.shutdownChan <- true 354 | }() 355 | } 356 | 357 | func (a *app) waitShutdown() { 358 | irqSig := make(chan os.Signal, 1) 359 | signal.Notify(irqSig, syscall.SIGINT, syscall.SIGTERM) 360 | 361 | //Wait interrupt or shutdown request through /shutdown 362 | select { 363 | case sig := <-irqSig: 364 | log.Printf("Shutdown request (signal: %v)", sig) 365 | os.Exit(0) 366 | case <-a.shutdownChan: 367 | os.Exit(0) 368 | } 369 | } 370 | 371 | func updateKubeConfig(IDToken string, refreshToken string, claims claim, a *app) error { 372 | var config *k8s_api.Config 373 | var outputFilename string 374 | var err error 375 | 376 | clientConfigLoadingRules := k8s_client.NewDefaultClientConfigLoadingRules() 377 | 378 | if a.kubeconfig != "" { 379 | if _, err = os.Stat(a.kubeconfig); os.IsNotExist(err) { 380 | config = k8s_api.NewConfig() 381 | err = nil 382 | } else { 383 | clientConfigLoadingRules.ExplicitPath = a.kubeconfig 384 | config, err = clientConfigLoadingRules.Load() 385 | } 386 | outputFilename = a.kubeconfig 387 | } else { 388 | config, err = clientConfigLoadingRules.Load() 389 | outputFilename = k8s_client.RecommendedHomeFile 390 | if !k8s_api.IsConfigEmpty(config) { 391 | outputFilename = clientConfigLoadingRules.GetDefaultFilename() 392 | } 393 | } 394 | if err != nil { 395 | return err 396 | } 397 | 398 | authInfo := k8s_api.NewAuthInfo() 399 | if conf, ok := config.AuthInfos[claims.Email]; ok { 400 | authInfo = conf 401 | } 402 | 403 | authInfo.AuthProvider = &k8s_api.AuthProviderConfig{ 404 | Name: "oidc", 405 | Config: map[string]string{ 406 | "client-id": a.clientID, 407 | "client-secret": a.clientSecret, 408 | "id-token": IDToken, 409 | "refresh-token": refreshToken, 410 | "idp-issuer-url": claims.Iss, 411 | }, 412 | } 413 | 414 | config.AuthInfos[claims.Email] = authInfo 415 | 416 | fmt.Printf("Writing config to %s\n", outputFilename) 417 | err = k8s_client.WriteToFile(*config, outputFilename) 418 | if err != nil { 419 | return err 420 | } 421 | return nil 422 | } 423 | 424 | func open(url string) error { 425 | 426 | var cmd string 427 | var args []string 428 | 429 | switch runtime.GOOS { 430 | case "windows": 431 | cmd = "cmd" 432 | args = []string{"/c", "start"} 433 | case "darwin": 434 | cmd = "open" 435 | default: // "linux", "freebsd", "openbsd", "netbsd" 436 | cmd = "xdg-open" 437 | } 438 | args = append(args, url) 439 | return exec.Command(cmd, args...).Start() 440 | } 441 | -------------------------------------------------------------------------------- /templates.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "html/template" 5 | "log" 6 | "net/http" 7 | ) 8 | 9 | type tokenTmplData struct { 10 | IDToken string 11 | RefreshToken string 12 | RedirectURL string 13 | Claims string 14 | Debug bool 15 | } 16 | 17 | var tokenTmpl = template.Must(template.New("token.html").Parse(` 18 | 19 | 29 | 30 | 31 |

Congratulations! You have successfully authenticated. Please close this page and return to your terminal.

32 | {{ if .Debug }} 33 |

Token: 

{{ .IDToken }}

34 |

Claims: 

{{ .Claims }}

35 | {{ if .RefreshToken }} 36 |

Refresh Token: 

{{ .RefreshToken }}

37 | {{ end }} 38 | {{ end }} 39 | 40 | 41 | `)) 42 | 43 | func renderToken(w http.ResponseWriter, redirectURL, idToken, refreshToken string, claims []byte, debug bool) { 44 | renderTemplate(w, tokenTmpl, tokenTmplData{ 45 | IDToken: idToken, 46 | RefreshToken: refreshToken, 47 | RedirectURL: redirectURL, 48 | Claims: string(claims), 49 | Debug: debug, 50 | }) 51 | } 52 | 53 | func renderTemplate(w http.ResponseWriter, tmpl *template.Template, data interface{}) { 54 | err := tmpl.Execute(w, data) 55 | if err == nil { 56 | return 57 | } 58 | 59 | switch err := err.(type) { 60 | case *template.Error: 61 | // An ExecError guarantees that Execute has not written to the underlying reader. 62 | log.Printf("Error rendering template %s: %s", tmpl.Name(), err) 63 | 64 | // TODO(ericchiang): replace with better internal server error. 65 | http.Error(w, "Internal server error", http.StatusInternalServerError) 66 | default: 67 | // An error with the underlying write, such as the connection being 68 | // dropped. Ignore for now. 69 | } 70 | } 71 | --------------------------------------------------------------------------------