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Add a tokenserver that hands out (invitation-) tokens based on OIDC
closes #115
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| tokenserver | ||
| settings.json |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "html/template" | ||
| "log" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/Jille/convreq" | ||
| "github.com/Jille/convreq/respond" | ||
| "github.com/Jille/rufs/security" | ||
| "github.com/coreos/go-oidc/v3/oidc" | ||
| "golang.org/x/oauth2" | ||
| ) | ||
|
|
||
| var ( | ||
| ca *security.CAKeyPair | ||
|
|
||
| oidcProvider *oidc.Provider | ||
| oauthConfig oauth2.Config | ||
| ) | ||
|
|
||
| type Config struct { | ||
| Certdir string `json:"certdir"` | ||
| OIDCProvider string `json:"oidc_provider"` | ||
| ClientID string `json:"client_id"` | ||
| ClientSecret string `json:"client_secret"` | ||
| ReturnURL string `json:"return_url"` | ||
| Port int `json:"port"` | ||
| } | ||
|
|
||
| func main() { | ||
| if len(os.Args) != 2 { | ||
| log.Fatalf("Usage: %s <configfile>", os.Args[0]) | ||
| } | ||
| c, err := os.ReadFile(os.Args[1]) | ||
| if err != nil { | ||
| log.Fatalf("Failed to read config file %q: %v", os.Args[1], err) | ||
| } | ||
| var cfg Config | ||
| if err := json.Unmarshal(c, &cfg); err != nil { | ||
| log.Fatalf("Failed to read config file %q: %v", os.Args[1], err) | ||
| } | ||
|
|
||
| if cfg.Certdir == "" { | ||
| log.Fatalf("Configuration setting \"certdir\" is empty") | ||
| } | ||
| if cfg.OIDCProvider == "" { | ||
| log.Fatalf("Configuration setting \"oidc_provider\" is empty") | ||
| } | ||
| if cfg.ClientID == "" { | ||
| log.Fatalf("Configuration setting \"client_id\" is empty") | ||
| } | ||
| if cfg.ClientSecret == "" { | ||
| log.Fatalf("Configuration setting \"client_secret\" is empty") | ||
| } | ||
| if cfg.ReturnURL == "" { | ||
| log.Fatalf("Configuration setting \"return_url\" is empty") | ||
| } | ||
| if cfg.Port == 0 { | ||
| log.Fatalf("Configuration setting \"port\" is not set") | ||
| } | ||
|
|
||
| ca, err = security.LoadCAKeyPair(cfg.Certdir) | ||
| if err != nil { | ||
| log.Fatalf("Failed to load CA key pair: %v", err) | ||
| } | ||
|
|
||
| oidcProvider, err = oidc.NewProvider(context.Background(), cfg.OIDCProvider) | ||
| if err != nil { | ||
| log.Fatalf("Failed to discover openid connect provider: %v", err) | ||
| } | ||
| oauthConfig = oauth2.Config{ | ||
| ClientID: cfg.ClientID, | ||
| ClientSecret: cfg.ClientSecret, | ||
| Endpoint: oidcProvider.Endpoint(), | ||
| RedirectURL: cfg.ReturnURL, | ||
| Scopes: []string{"openid"}, | ||
| } | ||
|
|
||
| http.Handle("/oauth2_return", convreq.Wrap(oauth2Return)) | ||
| http.Handle("/request_token", convreq.Wrap(requestToken)) | ||
| http.Handle("/", convreq.Wrap(mainPage)) | ||
| log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", cfg.Port), nil)) | ||
| } | ||
|
|
||
| type requestTokenGet struct { | ||
| Hostname string `schema:"hostname"` | ||
| ReturnURL string `schema:"return_url"` | ||
| } | ||
|
|
||
| func requestToken(get requestTokenGet) convreq.HttpResponse { | ||
| s := base64.URLEncoding.EncodeToString([]byte(get.Hostname)) + ":" + base64.URLEncoding.EncodeToString([]byte(get.ReturnURL)) | ||
| u := oauthConfig.AuthCodeURL(s) | ||
| return respond.Redirect(302, u) | ||
| } | ||
|
|
||
| type oauth2ReturnGet struct { | ||
| Code string `schema:"code"` | ||
| State string `schema:"state"` | ||
| } | ||
|
|
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| func oauth2Return(ctx context.Context, get oauth2ReturnGet) convreq.HttpResponse { | ||
| t, err := oauthConfig.Exchange(ctx, get.Code) | ||
| if err != nil { | ||
| return respond.BadRequest("Oauth failed: " + err.Error()) | ||
| } | ||
| userInfo, err := oidcProvider.UserInfo(ctx, oauth2.StaticTokenSource(t)) | ||
| if err != nil { | ||
| return respond.Error(err) | ||
| } | ||
| var ui UserInfo | ||
| if err := userInfo.Claims(&ui); err != nil { | ||
| return respond.Error(err) | ||
| } | ||
|
|
||
| sp := strings.Split(get.State, ":") | ||
| hostname, err := base64.URLEncoding.DecodeString(sp[0]) | ||
| if err != nil { | ||
| return respond.BadRequest("bad state") | ||
| } | ||
| returnURL, err := base64.URLEncoding.DecodeString(sp[1]) | ||
| if err != nil { | ||
| return respond.BadRequest("bad state") | ||
| } | ||
|
|
||
| username := strings.Split(ui.PreferredUsername, "@")[0] | ||
| username = strings.ReplaceAll(username, "-", "") | ||
| username += "-" + string(hostname) | ||
|
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| token := ca.CreateToken(username) | ||
|
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| u, err := url.Parse(string(returnURL)) | ||
| if err != nil { | ||
| return respond.BadRequest("Invalid return_url: " + err.Error()) | ||
| } | ||
| q := u.Query() | ||
| q.Set("username", username) | ||
| q.Set("token", token) | ||
| q.Set("circle", ca.Name()) | ||
| q.Set("fingerprint", ca.Fingerprint()) | ||
|
|
||
| if len(returnURL) == 0 { | ||
| var ret string | ||
| for k, vs := range q { | ||
| ret += k + ":" + vs[0] + "\n" | ||
| } | ||
| return respond.String(ret) | ||
| } | ||
|
|
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| u.RawQuery = q.Encode() | ||
| return respond.Redirect(302, u.String()) | ||
| } | ||
|
|
||
| type UserInfo struct { | ||
| Name string `json:"name"` | ||
| PreferredUsername string `json:"preferred_username"` | ||
| } | ||
|
|
||
| type mainPageGet struct { | ||
| Hostname string `schema:"hostname"` | ||
| ReturnURL string `schema:"return_url"` | ||
| } | ||
|
|
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| var mainPageTpl = template.Must(template.New("").Parse(` | ||
| <html> | ||
| <head> | ||
| </head> | ||
| <body> | ||
| <form method="GET" action="/request_token"> | ||
| Hostname: <input name="hostname" value="{{.Hostname}}" /> | ||
| <input type="hidden" name="return_url" value="{{.ReturnURL}}" /> | ||
| <input type="submit" value="Continue" /> | ||
| </form> | ||
| </body> | ||
| </html> | ||
| `)) | ||
|
|
||
| func mainPage(get mainPageGet) convreq.HttpResponse { | ||
| return respond.RenderTemplate(mainPageTpl, get) | ||
| } |
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