Quentin Dufour
158eda06de
All checks were successful
continuous-integration/drone/push Build is passing
358 lines
9.1 KiB
Go
358 lines
9.1 KiB
Go
package main
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import (
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"bytes"
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"crypto/rand"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"html/template"
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"log"
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"net/http"
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"regexp"
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"strings"
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"github.com/emersion/go-sasl"
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"github.com/emersion/go-smtp"
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"github.com/go-ldap/ldap/v3"
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"github.com/gorilla/mux"
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"golang.org/x/crypto/argon2"
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)
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var EMAIL_REGEXP = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
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func checkInviterLogin(w http.ResponseWriter, r *http.Request) *LoginStatus {
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login := checkLogin(w, r)
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if login == nil {
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return nil
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}
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if !login.CanInvite {
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http.Error(w, "Not authorized to invite new users.", http.StatusUnauthorized)
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return nil
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}
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return login
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}
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// New account creation directly from interface
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func handleInviteNewAccount(w http.ResponseWriter, r *http.Request) {
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login := checkInviterLogin(w, r)
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if login == nil {
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return
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}
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handleNewAccount(w, r, login.conn, login.Info.DN)
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}
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// New account creation using code
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func handleInvitationCode(w http.ResponseWriter, r *http.Request) {
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code := mux.Vars(r)["code"]
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code_id, code_pw := readCode(code)
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l := ldapOpen(w)
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if l == nil {
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return
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}
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inviteDn := config.InvitationNameAttr + "=" + code_id + "," + config.InvitationBaseDN
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err := l.Bind(inviteDn, code_pw)
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if err != nil {
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templateInviteInvalidCode := template.Must(template.ParseFiles(config.Resources[0]+"/templates/layout.html", config.Resources[0]+"/templates/invite_invalid_code.html"))
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templateInviteInvalidCode.Execute(w, nil)
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return
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}
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sReq := ldap.NewSearchRequest(
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inviteDn,
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ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false,
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fmt.Sprintf("(objectclass=*)"),
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[]string{"dn", "creatorsname"},
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nil)
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sr, err := l.Search(sReq)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if len(sr.Entries) != 1 {
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http.Error(w, fmt.Sprintf("Expected 1 entry, got %d", len(sr.Entries)), http.StatusInternalServerError)
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return
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}
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invitedBy := sr.Entries[0].GetAttributeValue("creatorsname")
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if handleNewAccount(w, r, l, invitedBy) {
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del_req := ldap.NewDelRequest(inviteDn, nil)
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err = l.Del(del_req)
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if err != nil {
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log.Printf("Could not delete invitation %s: %s", inviteDn, err)
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}
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}
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}
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// Common functions for new account
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type NewAccountData struct {
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Username string
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DisplayName string
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GivenName string
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Surname string
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ErrorUsernameTaken bool
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ErrorInvalidUsername bool
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ErrorPasswordTooShort bool
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ErrorPasswordMismatch bool
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ErrorMessage string
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WarningMessage string
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Success bool
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}
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func handleNewAccount(w http.ResponseWriter, r *http.Request, l *ldap.Conn, invitedBy string) bool {
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templateInviteNewAccount := template.Must(template.ParseFiles(config.Resources[0]+"/templates/layout.html", config.Resources[0]+"/templates/invite_new_account.html"))
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data := &NewAccountData{}
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if r.Method == "POST" {
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r.ParseForm()
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data.Username = strings.TrimSpace(strings.Join(r.Form["username"], ""))
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data.DisplayName = strings.TrimSpace(strings.Join(r.Form["displayname"], ""))
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data.GivenName = strings.TrimSpace(strings.Join(r.Form["givenname"], ""))
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data.Surname = strings.TrimSpace(strings.Join(r.Form["surname"], ""))
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password1 := strings.Join(r.Form["password"], "")
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password2 := strings.Join(r.Form["password2"], "")
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tryCreateAccount(l, data, password1, password2, invitedBy)
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}
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templateInviteNewAccount.Execute(w, data)
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return data.Success
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}
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func tryCreateAccount(l *ldap.Conn, data *NewAccountData, pass1 string, pass2 string, invitedBy string) {
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checkFailed := false
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// Check if username is correct
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if match, err := regexp.MatchString("^[a-z0-9._-]+$", data.Username); !(err == nil && match) {
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data.ErrorInvalidUsername = true
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checkFailed = true
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}
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// Check if user exists
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userDn := config.UserNameAttr + "=" + data.Username + "," + config.UserBaseDN
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searchRq := ldap.NewSearchRequest(
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userDn,
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ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false,
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"(objectclass=*)",
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[]string{"dn"},
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nil)
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sr, err := l.Search(searchRq)
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if err != nil {
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data.ErrorMessage = err.Error()
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checkFailed = true
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}
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if len(sr.Entries) > 0 {
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data.ErrorUsernameTaken = true
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checkFailed = true
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}
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// Check that password is long enough
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if len(pass1) < 8 {
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data.ErrorPasswordTooShort = true
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checkFailed = true
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}
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if pass1 != pass2 {
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data.ErrorPasswordMismatch = true
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checkFailed = true
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}
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if checkFailed {
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return
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}
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// Actually create user
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req := ldap.NewAddRequest(userDn, nil)
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req.Attribute("objectclass", []string{"inetOrgPerson", "organizationalPerson", "person", "top"})
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req.Attribute("structuralobjectclass", []string{"inetOrgPerson"})
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pw, err := SSHAEncode(pass1)
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if err != nil {
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data.ErrorMessage = err.Error()
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return
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}
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req.Attribute("userpassword", []string{pw})
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req.Attribute("invitedby", []string{invitedBy})
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if len(data.DisplayName) > 0 {
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req.Attribute("displayname", []string{data.DisplayName})
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}
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if len(data.GivenName) > 0 {
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req.Attribute("givenname", []string{data.GivenName})
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}
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if len(data.Surname) > 0 {
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req.Attribute("sn", []string{data.Surname})
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}
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if len(config.InvitedMailFormat) > 0 {
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email := strings.ReplaceAll(config.InvitedMailFormat, "{}", data.Username)
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req.Attribute("mail", []string{email})
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}
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err = l.Add(req)
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if err != nil {
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data.ErrorMessage = err.Error()
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return
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}
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for _, group := range config.InvitedAutoGroups {
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req := ldap.NewModifyRequest(group, nil)
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req.Add("member", []string{userDn})
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err = l.Modify(req)
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if err != nil {
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data.WarningMessage += fmt.Sprintf("Cannot add to %s: %s\n", group, err.Error())
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}
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}
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data.Success = true
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}
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// ---- Code generation ----
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type SendCodeData struct {
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ErrorMessage string
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ErrorInvalidEmail bool
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Success bool
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CodeDisplay string
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CodeSentTo string
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WebBaseAddress string
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}
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type CodeMailFields struct {
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From string
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To string
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Code string
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InviteFrom string
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WebBaseAddress string
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}
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func handleInviteSendCode(w http.ResponseWriter, r *http.Request) {
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templateInviteSendCode := template.Must(template.ParseFiles(config.Resources[0]+"/templates/layout.html", config.Resources[0]+"/templates/invite_send_code.html"))
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login := checkInviterLogin(w, r)
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if login == nil {
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return
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}
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data := &SendCodeData{
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WebBaseAddress: config.WebAddress,
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}
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if r.Method == "POST" {
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r.ParseForm()
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choice := strings.Join(r.Form["choice"], "")
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sendto := strings.Join(r.Form["sendto"], "")
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if choice == "display" || choice == "send" {
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trySendCode(login, choice, sendto, data)
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}
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}
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templateInviteSendCode.Execute(w, data)
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}
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func trySendCode(login *LoginStatus, choice string, sendto string, data *SendCodeData) {
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// Generate code
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code, code_id, code_pw := genCode()
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// Create invitation object in database
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inviteDn := config.InvitationNameAttr + "=" + code_id + "," + config.InvitationBaseDN
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req := ldap.NewAddRequest(inviteDn, nil)
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pw, err := SSHAEncode(code_pw)
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if err != nil {
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data.ErrorMessage = err.Error()
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return
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}
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req.Attribute("userpassword", []string{pw})
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req.Attribute("objectclass", []string{"top", "invitationCode"})
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err = login.conn.Add(req)
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if err != nil {
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data.ErrorMessage = err.Error()
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return
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}
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// If we want to display it, do so
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if choice == "display" {
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data.Success = true
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data.CodeDisplay = code
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return
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}
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// Otherwise, we are sending a mail
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if !EMAIL_REGEXP.MatchString(sendto) {
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data.ErrorInvalidEmail = true
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return
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}
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templateMail := template.Must(template.ParseFiles(config.Resources[0] + "/templates/invite_mail.txt"))
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buf := bytes.NewBuffer([]byte{})
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templateMail.Execute(buf, &CodeMailFields{
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To: sendto,
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From: config.MailFrom,
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InviteFrom: login.WelcomeName(),
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Code: code,
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WebBaseAddress: config.WebAddress,
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})
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log.Printf("Sending mail to: %s", sendto)
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var auth sasl.Client = nil
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if config.SMTPUsername != "" {
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auth = sasl.NewPlainClient("", config.SMTPUsername, config.SMTPPassword)
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}
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err = smtp.SendMail(config.SMTPServer, auth, config.MailFrom, []string{sendto}, buf)
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if err != nil {
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data.ErrorMessage = err.Error()
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return
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}
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log.Printf("Mail sent.")
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data.Success = true
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data.CodeSentTo = sendto
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}
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func genCode() (code string, code_id string, code_pw string) {
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random := make([]byte, 32)
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n, err := rand.Read(random)
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if err != nil || n != 32 {
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log.Fatalf("Could not generate random bytes: %s", err)
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}
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a := binary.BigEndian.Uint32(random[0:4])
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b := binary.BigEndian.Uint32(random[4:8])
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c := binary.BigEndian.Uint32(random[8:12])
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code = fmt.Sprintf("%03d-%03d-%03d", a%1000, b%1000, c%1000)
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code_id, code_pw = readCode(code)
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return
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}
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func readCode(code string) (code_id string, code_pw string) {
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// Strip everything that is not a digit
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code_digits := ""
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for _, c := range code {
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if c >= '0' && c <= '9' {
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code_digits = code_digits + string(c)
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}
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}
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id_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet ID"), 2, 64*1024, 4, 32)
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pw_hash := argon2.IDKey([]byte(code_digits), []byte("Guichet PW"), 2, 64*1024, 4, 32)
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code_id = hex.EncodeToString(id_hash[:8])
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code_pw = hex.EncodeToString(pw_hash[:16])
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return
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}
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