package main import ( "bytes" "crypto/rand" "encoding/binary" "encoding/hex" "fmt" "html/template" "log" "net/http" "regexp" "strings" "github.com/emersion/go-sasl" "github.com/emersion/go-smtp" "github.com/go-ldap/ldap/v3" "github.com/gorilla/mux" "golang.org/x/crypto/argon2" ) var EMAIL_REGEXP = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$") func checkInviterLogin(w http.ResponseWriter, r *http.Request) *LoginStatus { login := checkLogin(w, r) if login == nil { return nil } if !login.CanInvite { http.Error(w, "Not authorized to invite new users.", http.StatusUnauthorized) return nil } return login } // New account creation directly from interface func handleInviteNewAccount(w http.ResponseWriter, r *http.Request) { login := checkInviterLogin(w, r) if login == nil { return } handleNewAccount(w, r, login.conn, login.Info.DN) } // New account creation using code func handleInvitationCode(w http.ResponseWriter, r *http.Request) { code := mux.Vars(r)["code"] code_id, code_pw := readCode(code) l := ldapOpen(w) if l == nil { return } inviteDn := config.InvitationNameAttr + "=" + code_id + "," + config.InvitationBaseDN err := l.Bind(inviteDn, code_pw) if err != nil { templateInviteInvalidCode := template.Must(template.ParseFiles("templates/layout.html", "templates/invite_invalid_code.html")) templateInviteInvalidCode.Execute(w, nil) return } sReq := ldap.NewSearchRequest( inviteDn, ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false, fmt.Sprintf("(objectclass=*)"), []string{"dn", "creatorsname"}, nil) sr, err := l.Search(sReq) if err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) return } if len(sr.Entries) != 1 { http.Error(w, fmt.Sprintf("Expected 1 entry, got %d", len(sr.Entries)), http.StatusInternalServerError) return } invitedBy := sr.Entries[0].GetAttributeValue("creatorsname") if handleNewAccount(w, r, l, invitedBy) { del_req := ldap.NewDelRequest(inviteDn, nil) err = l.Del(del_req) if err != nil { log.Printf("Could not delete invitation %s: %s", inviteDn, err) } } } // Common functions for new account type NewAccountData struct { Username string DisplayName string GivenName string Surname string ErrorUsernameTaken bool ErrorInvalidUsername bool ErrorPasswordTooShort bool ErrorPasswordMismatch bool ErrorMessage string WarningMessage string Success bool } func handleNewAccount(w http.ResponseWriter, r *http.Request, l *ldap.Conn, invitedBy string) bool { templateInviteNewAccount := template.Must(template.ParseFiles("templates/layout.html", "templates/invite_new_account.html")) data := &NewAccountData{} if r.Method == "POST" { r.ParseForm() data.Username = strings.TrimSpace(strings.Join(r.Form["username"], "")) data.DisplayName = strings.TrimSpace(strings.Join(r.Form["displayname"], "")) data.GivenName = strings.TrimSpace(strings.Join(r.Form["givenname"], "")) data.Surname = strings.TrimSpace(strings.Join(r.Form["surname"], "")) password1 := strings.Join(r.Form["password"], "") password2 := strings.Join(r.Form["password2"], "") tryCreateAccount(l, data, password1, password2, invitedBy) } templateInviteNewAccount.Execute(w, data) return data.Success } func tryCreateAccount(l *ldap.Conn, data *NewAccountData, pass1 string, pass2 string, invitedBy string) { // Check if username is correct if match, err := regexp.MatchString("^[a-zA-Z0-9._-]+$", data.Username); !(err == nil && match) { data.ErrorInvalidUsername = true } // Check if user exists userDn := config.UserNameAttr + "=" + data.Username + "," + config.UserBaseDN searchRq := ldap.NewSearchRequest( userDn, ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false, "(objectclass=*)", []string{"dn"}, nil) sr, err := l.Search(searchRq) if err != nil { data.ErrorMessage = err.Error() return } if len(sr.Entries) > 0 { data.ErrorUsernameTaken = true return } // Check that password is long enough if len(pass1) < 8 { data.ErrorPasswordTooShort = true return } if pass1 != pass2 { data.ErrorPasswordMismatch = true return } // Actually create user req := ldap.NewAddRequest(userDn, nil) req.Attribute("objectclass", []string{"inetOrgPerson", "organizationalPerson", "person", "top"}) req.Attribute("structuralobjectclass", []string{"inetOrgPerson"}) req.Attribute("userpassword", []string{SSHAEncode([]byte(pass1))}) req.Attribute("invitedby", []string{invitedBy}) if len(data.DisplayName) > 0 { req.Attribute("displayname", []string{data.DisplayName}) } if len(data.GivenName) > 0 { req.Attribute("givenname", []string{data.GivenName}) } if len(data.Surname) > 0 { req.Attribute("sn", []string{data.Surname}) } if len(config.InvitedMailFormat) > 0 { email := strings.ReplaceAll(config.InvitedMailFormat, "{}", data.Username) req.Attribute("mail", []string{email}) } err = l.Add(req) if err != nil { data.ErrorMessage = err.Error() return } for _, group := range config.InvitedAutoGroups { req := ldap.NewModifyRequest(group, nil) req.Add("member", []string{userDn}) err = l.Modify(req) if err != nil { data.WarningMessage += fmt.Sprintf("Cannot add to %s: %s\n", group, err.Error()) } } data.Success = true } // ---- Code generation ---- type SendCodeData struct { ErrorMessage string ErrorInvalidEmail bool Success bool CodeDisplay string CodeSentTo string WebBaseAddress string } type CodeMailFields struct { From string To string Code string InviteFrom string WebBaseAddress string } func handleInviteSendCode(w http.ResponseWriter, r *http.Request) { templateInviteSendCode := template.Must(template.ParseFiles("templates/layout.html", "templates/invite_send_code.html")) login := checkInviterLogin(w, r) if login == nil { return } data := &SendCodeData{ WebBaseAddress: config.WebAddress, } if r.Method == "POST" { r.ParseForm() choice := strings.Join(r.Form["choice"], "") sendto := strings.Join(r.Form["sendto"], "") if choice == "display" || choice == "send" { trySendCode(login, choice, sendto, data) } } templateInviteSendCode.Execute(w, data) } func trySendCode(login *LoginStatus, choice string, sendto string, data *SendCodeData) { // Generate code code, code_id, code_pw := genCode() // Create invitation object in database inviteDn := config.InvitationNameAttr + "=" + code_id + "," + config.InvitationBaseDN req := ldap.NewAddRequest(inviteDn, nil) req.Attribute("userpassword", []string{SSHAEncode([]byte(code_pw))}) req.Attribute("objectclass", []string{"top", "invitationCode"}) err := login.conn.Add(req) if err != nil { data.ErrorMessage = err.Error() return } // If we want to display it, do so if choice == "display" { data.Success = true data.CodeDisplay = code return } // Otherwise, we are sending a mail if !EMAIL_REGEXP.MatchString(sendto) { data.ErrorInvalidEmail = true return } templateMail := template.Must(template.ParseFiles("templates/invite_mail.txt")) buf := bytes.NewBuffer([]byte{}) templateMail.Execute(buf, &CodeMailFields{ To: sendto, From: config.MailFrom, InviteFrom: login.WelcomeName(), Code: code, WebBaseAddress: config.WebAddress, }) log.Printf("Sending mail to: %s", sendto) var auth sasl.Client = nil if config.SMTPUsername != "" { auth = sasl.NewPlainClient("", config.SMTPUsername, config.SMTPPassword) } err = smtp.SendMail(config.SMTPServer, auth, config.MailFrom, []string{sendto}, buf) if err != nil { data.ErrorMessage = err.Error() return } log.Printf("Mail sent.") data.Success = true data.CodeSentTo = sendto } func genCode() (code string, code_id string, code_pw string) { random := make([]byte, 32) n, err := rand.Read(random) if err != nil || n != 32 { log.Fatalf("Could not generate random bytes: %s", err) } a := binary.BigEndian.Uint32(random[0:4]) b := binary.BigEndian.Uint32(random[4:8]) c := binary.BigEndian.Uint32(random[8:12]) code = fmt.Sprintf("%03d-%03d-%03d", a%1000, b%1000, c%1000) code_id, code_pw = readCode(code) return } func readCode(code string) (code_id string, code_pw string) { // Strip everything that is not a digit code_digits := "" for _, c := range code { if c >= '0' && c <= '9' { code_digits = code_digits + string(c) } } id_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet ID"), 2, 64*1024, 4, 32) pw_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet PW"), 2, 64*1024, 4, 32) code_id = hex.EncodeToString(id_hash[:8]) code_pw = hex.EncodeToString(pw_hash[:16]) return }