From eb1754dd4c2d72d64dc8ae99953359b04569b37a Mon Sep 17 00:00:00 2001 From: Chris Date: Thu, 6 Oct 2022 01:22:09 +0200 Subject: [PATCH] Auto-detect Kubernetes API URL --- go.mod | 10 +++++++++- go.sum | 23 +++++++++++++++++++++-- pkg/webui/server.go | 1 + webui_command.go | 43 ++++++++++++++++++++++++++++++++++++++++--- 4 files changed, 71 insertions(+), 6 deletions(-) diff --git a/go.mod b/go.mod index 0f7a1923..fab054e5 100644 --- a/go.mod +++ b/go.mod @@ -7,6 +7,7 @@ require ( github.com/go-logr/logr v1.2.3 github.com/go-logr/zapr v1.2.3 github.com/labstack/echo/v4 v4.9.0 + github.com/lestrrat-go/jwx/v2 v2.0.6 github.com/stretchr/testify v1.8.0 github.com/urfave/cli/v2 v2.11.1 go.uber.org/zap v1.23.0 @@ -25,6 +26,7 @@ require ( github.com/cespare/xxhash/v2 v2.1.2 // indirect github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect github.com/davecgh/go-spew v1.1.1 // indirect + github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0 // indirect github.com/emicklei/go-restful/v3 v3.8.0 // indirect github.com/evanphx/json-patch/v5 v5.6.0 // indirect github.com/fatih/color v1.12.0 // indirect @@ -33,6 +35,7 @@ require ( github.com/go-openapi/jsonreference v0.19.5 // indirect github.com/go-openapi/swag v0.19.14 // indirect github.com/gobuffalo/flect v0.2.5 // indirect + github.com/goccy/go-json v0.9.11 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang-jwt/jwt v3.2.2+incompatible // indirect github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect @@ -46,6 +49,11 @@ require ( github.com/josharian/intern v1.0.0 // indirect github.com/json-iterator/go v1.1.12 // indirect github.com/labstack/gommon v0.3.1 // indirect + github.com/lestrrat-go/blackmagic v1.0.1 // indirect + github.com/lestrrat-go/httpcc v1.0.1 // indirect + github.com/lestrrat-go/httprc v1.0.4 // indirect + github.com/lestrrat-go/iter v1.0.2 // indirect + github.com/lestrrat-go/option v1.0.0 // indirect github.com/mailru/easyjson v0.7.6 // indirect github.com/mattn/go-colorable v0.1.11 // indirect github.com/mattn/go-isatty v0.0.14 // indirect @@ -67,7 +75,7 @@ require ( github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect go.uber.org/atomic v1.7.0 // indirect go.uber.org/multierr v1.6.0 // indirect - golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd // indirect + golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f // indirect golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect diff --git a/go.sum b/go.sum index ce4f4470..6b9fcc02 100644 --- a/go.sum +++ b/go.sum @@ -66,6 +66,9 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc= +github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0 h1:HbphB4TFFXpv7MNrT52FGrrgVXF1owhMVTHFZIlnvd4= +github.com/decred/dcrd/dcrec/secp256k1/v4 v4.1.0/go.mod h1:DZGJHZMqrU4JJqFAWUS2UO1+lbSKsdiOoYi9Zzey7Fc= github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE= github.com/emicklei/go-restful/v3 v3.8.0 h1:eCZ8ulSerjdAiaNpF7GxXIE7ZCMo1moN1qX+S609eVw= github.com/emicklei/go-restful/v3 v3.8.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= @@ -108,6 +111,8 @@ github.com/go-openapi/swag v0.19.14/go.mod h1:QYRuS/SOXUCsnplDa677K7+DxSOj6IPNl/ github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY= github.com/gobuffalo/flect v0.2.5 h1:H6vvsv2an0lalEaCDRThvtBfmg44W/QHXBCYUXf/6S4= github.com/gobuffalo/flect v0.2.5/go.mod h1:1ZyCLIbg0YD7sDkzvFdPoOydPtD8y9JQnrOROolUcM8= +github.com/goccy/go-json v0.9.11 h1:/pAaQDLHEoCq/5FFmSKBswWmK6H0e8g4159Kc/X/nqk= +github.com/goccy/go-json v0.9.11/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I= github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ= github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= @@ -210,6 +215,18 @@ github.com/labstack/echo/v4 v4.9.0 h1:wPOF1CE6gvt/kmbMR4dGzWvHMPT+sAEUJOwOTtvITV github.com/labstack/echo/v4 v4.9.0/go.mod h1:xkCDAdFCIf8jsFQ5NnbK7oqaF/yU1A1X20Ltm0OvSks= github.com/labstack/gommon v0.3.1 h1:OomWaJXm7xR6L1HmEtGyQf26TEn7V6X88mktX9kee9o= github.com/labstack/gommon v0.3.1/go.mod h1:uW6kP17uPlLJsD3ijUYn3/M5bAxtlZhMI6m3MFxTMTM= +github.com/lestrrat-go/blackmagic v1.0.1 h1:lS5Zts+5HIC/8og6cGHb0uCcNCa3OUt1ygh3Qz2Fe80= +github.com/lestrrat-go/blackmagic v1.0.1/go.mod h1:UrEqBzIR2U6CnzVyUtfM6oZNMt/7O7Vohk2J0OGSAtU= +github.com/lestrrat-go/httpcc v1.0.1 h1:ydWCStUeJLkpYyjLDHihupbn2tYmZ7m22BGkcvZZrIE= +github.com/lestrrat-go/httpcc v1.0.1/go.mod h1:qiltp3Mt56+55GPVCbTdM9MlqhvzyuL6W/NMDA8vA5E= +github.com/lestrrat-go/httprc v1.0.4 h1:bAZymwoZQb+Oq8MEbyipag7iSq6YIga8Wj6GOiJGdI8= +github.com/lestrrat-go/httprc v1.0.4/go.mod h1:mwwz3JMTPBjHUkkDv/IGJ39aALInZLrhBp0X7KGUZlo= +github.com/lestrrat-go/iter v1.0.2 h1:gMXo1q4c2pHmC3dn8LzRhJfP1ceCbgSiT9lUydIzltI= +github.com/lestrrat-go/iter v1.0.2/go.mod h1:Momfcq3AnRlRjI5b5O8/G5/BvpzrhoFTZcn06fEOPt4= +github.com/lestrrat-go/jwx/v2 v2.0.6 h1:RlyYNLV892Ed7+FTfj1ROoF6x7WxL965PGTHso/60G0= +github.com/lestrrat-go/jwx/v2 v2.0.6/go.mod h1:aVrGuwEr3cp2Prw6TtQvr8sQxe+84gruID5C9TxT64Q= +github.com/lestrrat-go/option v1.0.0 h1:WqAWL8kh8VcSoD6xjSH34/1m8yxluXQbDeKNfvFeEO4= +github.com/lestrrat-go/option v1.0.0/go.mod h1:5ZHFbivi4xwXxhxY9XHDe2FHo6/Z7WWmtT7T5nBBp3I= github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc= github.com/mailru/easyjson v0.0.0-20190626092158-b2ccc519800e/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc= github.com/mailru/easyjson v0.7.6 h1:8yTIVnZgCoiM1TgqoeTl+LfU5Jg6/xL3QhGQnimLYnA= @@ -324,8 +341,8 @@ golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8U golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= -golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd h1:XcWmESyNjXJMLahc3mqVQJcgSTDxFxhETVlfk9uGc38= -golang.org/x/crypto v0.0.0-20220315160706-3147a52a75dd/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4= +golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f h1:OeJjE6G4dgCY4PIXvIRQbE8+RX+uXZyGhUy/ksMGJoc= +golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4= golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA= golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8= @@ -389,6 +406,7 @@ golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81R golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA= golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU= golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y= +golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y= golang.org/x/net v0.0.0-20220722155237-a158d28d115b h1:PxfKdU9lEEDYjdIzOtC4qFWgkU2rGHdKlKowJSMN9h0= golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c= golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U= @@ -446,6 +464,7 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= diff --git a/pkg/webui/server.go b/pkg/webui/server.go index 5c14cfa2..b871a13f 100644 --- a/pkg/webui/server.go +++ b/pkg/webui/server.go @@ -77,6 +77,7 @@ func (c *Command) setupRoutes(ctx *commandContext) error { } func (c *Command) setupProxy(ctx *commandContext) error { + c.Log.Info("Setting up proxy", "url", c.ApiURL, "skip_tls_verify", c.ApiTLSSkipVerify) u, err := url.Parse(c.ApiURL) if err != nil { return err diff --git a/webui_command.go b/webui_command.go index 0c90422c..37602725 100644 --- a/webui_command.go +++ b/webui_command.go @@ -1,29 +1,66 @@ package main import ( + "os" + "github.com/ccremer/clustercode/pkg/webui" + "github.com/lestrrat-go/jwx/v2/jwt" "github.com/urfave/cli/v2" ) +const apiUrlFlag = "api-url" + func newWebuiCommand() *cli.Command { command := &webui.Command{} return &cli.Command{ Name: "webui", Usage: "Start clustercode frontend web server", - Before: LogMetadata, + Before: discoverKubernetesAPI, Action: func(ctx *cli.Context) error { command.Log = AppLogger(ctx).WithName(ctx.Command.Name) return command.Execute(ctx.Context) }, Flags: []cli.Flag{ - &cli.StringFlag{Name: "api-url", EnvVars: envVars("API_URL"), - Usage: "Full base URL of the Kubernetes API server that is being proxied. If empty, the proxy is disabled.", + &cli.StringFlag{Name: apiUrlFlag, EnvVars: envVars("API_URL"), + Usage: "Full base URL of the Kubernetes API server that is being proxied. If empty, the proxy is disabled. If set to 'auto', it will try to discover it using the service account token.", + Value: "auto", Destination: &command.ApiURL, }, &cli.BoolFlag{Name: "api-tls-skip-verify", EnvVars: envVars("API_TLS_SKIP_VERIFY"), Usage: "Whether the certificate verification of the Kubernetes API server should be verified", Destination: &command.ApiTLSSkipVerify, }, + &cli.PathFlag{Name: "sa-token-path", EnvVars: envVars("API_SA_TOKEN_PATH"), + Usage: "Path to the Kubernetes Service Account token secret for auto-discovery", + Value: "/var/run/secrets/kubernetes.io/serviceaccount/token", + }, }, } } + +func discoverKubernetesAPI(ctx *cli.Context) error { + _ = LogMetadata(ctx) + log := AppLogger(ctx).WithName(ctx.Command.Name) + + if ctx.String(apiUrlFlag) != "auto" { + return nil + } + + path := ctx.String("sa-token-path") + raw, err := os.ReadFile(path) + if err != nil { + log.Info("Cannot read the token", "error", err.Error()) + return ctx.Set(apiUrlFlag, "") + } + token, err := jwt.Parse(raw, jwt.WithVerify(false)) + if err != nil { + log.Info("Cannot parse the token", "error", err.Error()) + return ctx.Set(apiUrlFlag, "") + } + aud := token.Audience() + if len(aud) > 0 { + log.Info("Discovered Kubernetes API URL", "url", aud[0]) + return ctx.Set(apiUrlFlag, aud[0]) + } + return nil +}