| 1 | package home |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "net" |
| 6 | "net/http" |
| 7 | "net/url" |
| 8 | "os" |
| 9 | "strings" |
| 10 | ) |
| 11 | |
| 12 | const ( |
| 13 | suiteDomain = "oficina.works" |
| 14 | credentialHost = "id." + suiteDomain |
| 15 | directoryHost = suiteDomain |
| 16 | directoryOrigin = "https://" + directoryHost |
| 17 | ) |
| 18 | |
| 19 | var errOrigins = errors.New("home: invalid origin configuration") |
| 20 | |
| 21 | type Origins struct { |
| 22 | Credential string |
| 23 | Directory string |
| 24 | } |
| 25 | |
| 26 | func LoadOrigins() (Origins, error) { |
| 27 | credential, haveCredential := os.LookupEnv("HOME_CREDENTIAL_ORIGIN") |
| 28 | directory, haveDirectory := os.LookupEnv("HOME_DIRECTORY_ORIGIN") |
| 29 | if !haveCredential && !haveDirectory { |
| 30 | return Origins{Origin, directoryOrigin}, nil |
| 31 | } |
| 32 | origins := Origins{credential, directory} |
| 33 | if !haveCredential || !haveDirectory { |
| 34 | return Origins{}, errOrigins |
| 35 | } |
| 36 | return origins, origins.validate() |
| 37 | } |
| 38 | |
| 39 | func originHost(origin string) (string, error) { |
| 40 | u, err := url.Parse(origin) |
| 41 | if err != nil || u.Scheme != "https" || u.User != nil || u.Host == "" || origin != "https://"+u.Host || u.Host != strings.ToLower(u.Host) || net.ParseIP(u.Host) != nil { |
| 42 | return "", errOrigins |
| 43 | } |
| 44 | if len(u.Host) > 253 { |
| 45 | return "", errOrigins |
| 46 | } |
| 47 | labels := strings.Split(u.Host, ".") |
| 48 | if len(labels) < 2 { |
| 49 | return "", errOrigins |
| 50 | } |
| 51 | for _, label := range labels { |
| 52 | if len(label) == 0 || len(label) > 63 || label[0] == '-' || label[len(label)-1] == '-' { |
| 53 | return "", errOrigins |
| 54 | } |
| 55 | for _, c := range label { |
| 56 | if !(c >= 'a' && c <= 'z' || c >= '0' && c <= '9' || c == '-') { |
| 57 | return "", errOrigins |
| 58 | } |
| 59 | } |
| 60 | } |
| 61 | return u.Host, nil |
| 62 | } |
| 63 | |
| 64 | func (o Origins) validate() error { |
| 65 | credential, err := originHost(o.Credential) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | directory, err := originHost(o.Directory) |
| 70 | if err != nil { |
| 71 | return err |
| 72 | } |
| 73 | if directory == credential || strings.HasSuffix(directory, "."+credential) { |
| 74 | return errOrigins |
| 75 | } |
| 76 | if o.Credential == Origin && o.Directory == directoryOrigin { |
| 77 | return nil |
| 78 | } |
| 79 | for _, host := range []string{credential, directory} { |
| 80 | if host == directoryHost || host == credentialHost || strings.HasSuffix(host, "."+credentialHost) { |
| 81 | return errOrigins |
| 82 | } |
| 83 | } |
| 84 | return nil |
| 85 | } |
| 86 | |
| 87 | func (a *App) serveKnownHost(next http.Handler) http.Handler { |
| 88 | return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 89 | host := strings.ToLower(r.Host) |
| 90 | if a.runtime != nil && ((a.runtime.role == "credential" && host != a.credentialHost) || (a.runtime.role == "directory" && host != a.directoryHost)) { |
| 91 | w.WriteHeader(http.StatusNotFound) |
| 92 | return |
| 93 | } |
| 94 | if host != a.credentialHost && host != a.directoryHost { |
| 95 | w.WriteHeader(http.StatusNotFound) |
| 96 | return |
| 97 | } |
| 98 | next.ServeHTTP(w, r) |
| 99 | }) |
| 100 | } |
| 101 | |
| 102 | func (a *App) credentialOnly(next http.Handler) http.Handler { |
| 103 | return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 104 | if strings.ToLower(r.Host) != a.credentialHost { |
| 105 | w.WriteHeader(http.StatusNotFound) |
| 106 | return |
| 107 | } |
| 108 | next.ServeHTTP(w, r) |
| 109 | }) |
| 110 | } |
| 111 | |
amadan