Various fixes in login sources (#10428)

models/error.go

 	return fmt.Sprintf("name pattern is not allowed [pattern: %s]", err.Pattern)
 }
 
+// ErrNameCharsNotAllowed represents a "character not allowed in name" error.
+type ErrNameCharsNotAllowed struct {
+	Name string
+}
+
+// IsErrNameCharsNotAllowed checks if an error is an ErrNameCharsNotAllowed.
+func IsErrNameCharsNotAllowed(err error) bool {
+	_, ok := err.(ErrNameCharsNotAllowed)
+	return ok
+}
+
+func (err ErrNameCharsNotAllowed) Error() string {
+	return fmt.Sprintf("User name is invalid [%s]: must be valid alpha or numeric or dash(-_) or dot characters", err.Name)
+}
+
 // ErrSSHDisabled represents an "SSH disabled" error.
 type ErrSSHDisabled struct {
 }

models/login_source.go

 	"fmt"
 	"net/smtp"
 	"net/textproto"
-	"regexp"
 	"strings"
 
 	"code.gitea.io/gitea/modules/auth/ldap"
 	}
 }
 
-var (
-	alphaDashDotPattern = regexp.MustCompile(`[^\w-\.]`)
-)
-
 // LoginViaLDAP queries if login/password is valid against the LDAP directory pool,
 // and create a local user if success when enabled.
 func LoginViaLDAP(user *User, login, password string, source *LoginSource) (*User, error) {
 	if len(sr.Username) == 0 {
 		sr.Username = login
 	}
-	// Validate username make sure it satisfies requirement.
-	if alphaDashDotPattern.MatchString(sr.Username) {
-		return nil, fmt.Errorf("Invalid pattern for attribute 'username' [%s]: must be valid alpha or numeric or dash(-_) or dot characters", sr.Username)
-	}
 
 	if len(sr.Mail) == 0 {
 		sr.Mail = fmt.Sprintf("%s@localhost", sr.Username)
 // LoginViaPAM queries if login/password is valid against the PAM,
 // and create a local user if success when enabled.
 func LoginViaPAM(user *User, login, password string, sourceID int64, cfg *PAMConfig) (*User, error) {
-	if err := pam.Auth(cfg.ServiceName, login, password); err != nil {
+	pamLogin, err := pam.Auth(cfg.ServiceName, login, password)
+	if err != nil {
 		if strings.Contains(err.Error(), "Authentication failure") {
 			return nil, ErrUserNotExist{0, login, 0}
 		}
 		return user, nil
 	}
 
+	// Allow PAM sources with `@` in their name, like from Active Directory
+	username := pamLogin
+	idx := strings.Index(pamLogin, "@")
+	if idx > -1 {
+		username = pamLogin[:idx]
+	}
+
 	user = &User{
-		LowerName:   strings.ToLower(login),
-		Name:        login,
-		Email:       login,
+		LowerName:   strings.ToLower(username),
+		Name:        username,
+		Email:       pamLogin,
 		Passwd:      password,
 		LoginType:   LoginPAM,
 		LoginSource: sourceID,
-		LoginName:   login,
+		LoginName:   login, // This is what the user typed in
 		IsActive:    true,
 	}
 	return user, CreateUser(user)

models/user.go

 	"image/png"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
 
 	// ErrUnsupportedLoginType login source is unknown error
 	ErrUnsupportedLoginType = errors.New("Login source is unknown")
+
+	// Characters prohibited in a user name (anything except A-Za-z0-9_.-)
+	alphaDashDotPattern = regexp.MustCompile(`[^\w-\.]`)
 )
 
 // User represents the object of individual and member of organization.
 
 // IsUsableUsername returns an error when a username is reserved
 func IsUsableUsername(name string) error {
+	// Validate username make sure it satisfies requirement.
+	if alphaDashDotPattern.MatchString(name) {
+		// Note: usually this error is normally caught up earlier in the UI
+		return ErrNameCharsNotAllowed{Name: name}
+	}
 	return isUsableName(reservedUsernames, reservedUserPatterns, name)
 }
 

modules/auth/pam/pam.go

 )
 
 // Auth pam auth service
-func Auth(serviceName, userName, passwd string) error {
+func Auth(serviceName, userName, passwd string) (string, error) {
 	t, err := pam.StartFunc(serviceName, userName, func(s pam.Style, msg string) (string, error) {
 		switch s {
 		case pam.PromptEchoOff:
 	})
 
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	if err = t.Authenticate(0); err != nil {
-		return err
+		return "", err
 	}
 
-	return nil
+	// PAM login names might suffer transformations in the PAM stack.
+	// We should take whatever the PAM stack returns for it.
+	return t.GetItem(pam.User)
 }

modules/auth/pam/pam_stub.go

 )
 
 // Auth not supported lack of pam tag
-func Auth(serviceName, userName, passwd string) error {
-	return errors.New("PAM not supported")
+func Auth(serviceName, userName, passwd string) (string, error) {
+	return "", errors.New("PAM not supported")
 }

modules/repository/create_test.go

 
 	// Create org.
 	org := &models.User{
-		Name:       "All repo",
+		Name:       "All_repo",
 		IsActive:   true,
 		Type:       models.UserTypeOrganization,
 		Visibility: structs.VisibleTypePublic,

options/locale/locale_en-US.ini

 
 form.name_reserved = The username '%s' is reserved.
 form.name_pattern_not_allowed = The pattern '%s' is not allowed in a username.
+form.name_chars_not_allowed = User name '%s' contains invalid characters.
 
 [settings]
 profile = Profile

routers/admin/users.go

 		case models.IsErrNamePatternNotAllowed(err):
 			ctx.Data["Err_UserName"] = true
 			ctx.RenderWithErr(ctx.Tr("user.form.name_pattern_not_allowed", err.(models.ErrNamePatternNotAllowed).Pattern), tplUserNew, &form)
+		case models.IsErrNameCharsNotAllowed(err):
+			ctx.Data["Err_UserName"] = true
+			ctx.RenderWithErr(ctx.Tr("user.form.name_chars_not_allowed", err.(models.ErrNameCharsNotAllowed).Name), tplUserNew, &form)
 		default:
 			ctx.ServerError("CreateUser", err)
 		}

routers/api/v1/admin/org.go

 	if err := models.CreateOrganization(org, u); err != nil {
 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrNameReserved(err) ||
+			models.IsErrNameCharsNotAllowed(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
 			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {

routers/api/v1/admin/user.go

 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrEmailAlreadyUsed(err) ||
 			models.IsErrNameReserved(err) ||
+			models.IsErrNameCharsNotAllowed(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
 			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {

routers/api/v1/org/org.go

 	if err := models.CreateOrganization(org, ctx.User); err != nil {
 		if models.IsErrUserAlreadyExist(err) ||
 			models.IsErrNameReserved(err) ||
+			models.IsErrNameCharsNotAllowed(err) ||
 			models.IsErrNamePatternNotAllowed(err) {
 			ctx.Error(http.StatusUnprocessableEntity, "", err)
 		} else {

routers/api/v1/repo/migrate.go

 		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("You have already reached your limit of %d repositories.", repoOwner.MaxCreationLimit()))
 	case models.IsErrNameReserved(err):
 		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("The username '%s' is reserved.", err.(models.ErrNameReserved).Name))
+	case models.IsErrNameCharsNotAllowed(err):
+		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("The username '%s' contains invalid characters.", err.(models.ErrNameCharsNotAllowed).Name))
 	case models.IsErrNamePatternNotAllowed(err):
 		ctx.Error(http.StatusUnprocessableEntity, "", fmt.Sprintf("The pattern '%s' is not allowed in a username.", err.(models.ErrNamePatternNotAllowed).Pattern))
 	default:

routers/user/auth.go

 		LoginName:   gothUser.(goth.User).UserID,
 	}
 
+	//nolint: dupl
 	if err := models.CreateUser(u); err != nil {
 		switch {
 		case models.IsErrUserAlreadyExist(err):
 		case models.IsErrNamePatternNotAllowed(err):
 			ctx.Data["Err_UserName"] = true
 			ctx.RenderWithErr(ctx.Tr("user.form.name_pattern_not_allowed", err.(models.ErrNamePatternNotAllowed).Pattern), tplLinkAccount, &form)
+		case models.IsErrNameCharsNotAllowed(err):
+			ctx.Data["Err_UserName"] = true
+			ctx.RenderWithErr(ctx.Tr("user.form.name_chars_not_allowed", err.(models.ErrNameCharsNotAllowed).Name), tplLinkAccount, &form)
 		default:
 			ctx.ServerError("CreateUser", err)
 		}

routers/user/auth_openid.go

 		Passwd:   password,
 		IsActive: !setting.Service.RegisterEmailConfirm,
 	}
+	//nolint: dupl
 	if err := models.CreateUser(u); err != nil {
 		switch {
 		case models.IsErrUserAlreadyExist(err):
 		case models.IsErrNamePatternNotAllowed(err):
 			ctx.Data["Err_UserName"] = true
 			ctx.RenderWithErr(ctx.Tr("user.form.name_pattern_not_allowed", err.(models.ErrNamePatternNotAllowed).Pattern), tplSignUpOID, &form)
+		case models.IsErrNameCharsNotAllowed(err):
+			ctx.Data["Err_UserName"] = true
+			ctx.RenderWithErr(ctx.Tr("user.form.name_chars_not_allowed", err.(models.ErrNameCharsNotAllowed).Name), tplSignUpOID, &form)
 		default:
 			ctx.ServerError("CreateUser", err)
 		}

routers/user/setting/profile.go

 			case models.IsErrNamePatternNotAllowed(err):
 				ctx.Flash.Error(ctx.Tr("user.form.name_pattern_not_allowed", newName))
 				ctx.Redirect(setting.AppSubURL + "/user/settings")
+			case models.IsErrNameCharsNotAllowed(err):
+				ctx.Flash.Error(ctx.Tr("user.form.name_chars_not_allowed", newName))
+				ctx.Redirect(setting.AppSubURL + "/user/settings")
 			default:
 				ctx.ServerError("ChangeUserName", err)
 			}