1 files changed, 412 insertions, 0 deletions
diff --git a/models/auth/source.go b/models/auth/source.go
new file mode 100644
index 0000000..8f7c2a8
--- /dev/null
+++ b/models/auth/source.go
@@ -0,0 +1,412 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"context"
+	"fmt"
+	"reflect"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/optional"
+	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
+
+	"xorm.io/builder"
+	"xorm.io/xorm"
+	"xorm.io/xorm/convert"
+)
+
+// Type represents an login type.
+type Type int
+
+// Note: new type must append to the end of list to maintain compatibility.
+const (
+	NoType Type = iota
+	Plain       // 1
+	LDAP        // 2
+	SMTP        // 3
+	PAM         // 4
+	DLDAP       // 5
+	OAuth2      // 6
+	SSPI        // 7
+	Remote      // 8
+)
+
+// String returns the string name of the LoginType
+func (typ Type) String() string {
+	return Names[typ]
+}
+
+// Int returns the int value of the LoginType
+func (typ Type) Int() int {
+	return int(typ)
+}
+
+// Names contains the name of LoginType values.
+var Names = map[Type]string{
+	LDAP:   "LDAP (via BindDN)",
+	DLDAP:  "LDAP (simple auth)", // Via direct bind
+	SMTP:   "SMTP",
+	PAM:    "PAM",
+	OAuth2: "OAuth2",
+	SSPI:   "SPNEGO with SSPI",
+	Remote: "Remote",
+}
+
+// Config represents login config as far as the db is concerned
+type Config interface {
+	convert.Conversion
+}
+
+// SkipVerifiable configurations provide a IsSkipVerify to check if SkipVerify is set
+type SkipVerifiable interface {
+	IsSkipVerify() bool
+}
+
+// HasTLSer configurations provide a HasTLS to check if TLS can be enabled
+type HasTLSer interface {
+	HasTLS() bool
+}
+
+// UseTLSer configurations provide a HasTLS to check if TLS is enabled
+type UseTLSer interface {
+	UseTLS() bool
+}
+
+// SSHKeyProvider configurations provide ProvidesSSHKeys to check if they provide SSHKeys
+type SSHKeyProvider interface {
+	ProvidesSSHKeys() bool
+}
+
+// RegisterableSource configurations provide RegisterSource which needs to be run on creation
+type RegisterableSource interface {
+	RegisterSource() error
+	UnregisterSource() error
+}
+
+var registeredConfigs = map[Type]func() Config{}
+
+// RegisterTypeConfig register a config for a provided type
+func RegisterTypeConfig(typ Type, exemplar Config) {
+	if reflect.TypeOf(exemplar).Kind() == reflect.Ptr {
+		// Pointer:
+		registeredConfigs[typ] = func() Config {
+			return reflect.New(reflect.ValueOf(exemplar).Elem().Type()).Interface().(Config)
+		}
+		return
+	}
+
+	// Not a Pointer
+	registeredConfigs[typ] = func() Config {
+		return reflect.New(reflect.TypeOf(exemplar)).Elem().Interface().(Config)
+	}
+}
+
+// SourceSettable configurations can have their authSource set on them
+type SourceSettable interface {
+	SetAuthSource(*Source)
+}
+
+// Source represents an external way for authorizing users.
+type Source struct {
+	ID            int64 `xorm:"pk autoincr"`
+	Type          Type
+	Name          string             `xorm:"UNIQUE"`
+	IsActive      bool               `xorm:"INDEX NOT NULL DEFAULT false"`
+	IsSyncEnabled bool               `xorm:"INDEX NOT NULL DEFAULT false"`
+	Cfg           convert.Conversion `xorm:"TEXT"`
+
+	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
+	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
+}
+
+// TableName xorm will read the table name from this method
+func (Source) TableName() string {
+	return "login_source"
+}
+
+func init() {
+	db.RegisterModel(new(Source))
+}
+
+// BeforeSet is invoked from XORM before setting the value of a field of this object.
+func (source *Source) BeforeSet(colName string, val xorm.Cell) {
+	if colName == "type" {
+		typ := Type(db.Cell2Int64(val))
+		constructor, ok := registeredConfigs[typ]
+		if !ok {
+			return
+		}
+		source.Cfg = constructor()
+		if settable, ok := source.Cfg.(SourceSettable); ok {
+			settable.SetAuthSource(source)
+		}
+	}
+}
+
+// TypeName return name of this login source type.
+func (source *Source) TypeName() string {
+	return Names[source.Type]
+}
+
+// IsLDAP returns true of this source is of the LDAP type.
+func (source *Source) IsLDAP() bool {
+	return source.Type == LDAP
+}
+
+// IsDLDAP returns true of this source is of the DLDAP type.
+func (source *Source) IsDLDAP() bool {
+	return source.Type == DLDAP
+}
+
+// IsSMTP returns true of this source is of the SMTP type.
+func (source *Source) IsSMTP() bool {
+	return source.Type == SMTP
+}
+
+// IsPAM returns true of this source is of the PAM type.
+func (source *Source) IsPAM() bool {
+	return source.Type == PAM
+}
+
+// IsOAuth2 returns true of this source is of the OAuth2 type.
+func (source *Source) IsOAuth2() bool {
+	return source.Type == OAuth2
+}
+
+// IsSSPI returns true of this source is of the SSPI type.
+func (source *Source) IsSSPI() bool {
+	return source.Type == SSPI
+}
+
+func (source *Source) IsRemote() bool {
+	return source.Type == Remote
+}
+
+// HasTLS returns true of this source supports TLS.
+func (source *Source) HasTLS() bool {
+	hasTLSer, ok := source.Cfg.(HasTLSer)
+	return ok && hasTLSer.HasTLS()
+}
+
+// UseTLS returns true of this source is configured to use TLS.
+func (source *Source) UseTLS() bool {
+	useTLSer, ok := source.Cfg.(UseTLSer)
+	return ok && useTLSer.UseTLS()
+}
+
+// SkipVerify returns true if this source is configured to skip SSL
+// verification.
+func (source *Source) SkipVerify() bool {
+	skipVerifiable, ok := source.Cfg.(SkipVerifiable)
+	return ok && skipVerifiable.IsSkipVerify()
+}
+
+// CreateSource inserts a AuthSource in the DB if not already
+// existing with the given name.
+func CreateSource(ctx context.Context, source *Source) error {
+	has, err := db.GetEngine(ctx).Where("name=?", source.Name).Exist(new(Source))
+	if err != nil {
+		return err
+	} else if has {
+		return ErrSourceAlreadyExist{source.Name}
+	}
+	// Synchronization is only available with LDAP for now
+	if !source.IsLDAP() && !source.IsOAuth2() {
+		source.IsSyncEnabled = false
+	}
+
+	_, err = db.GetEngine(ctx).Insert(source)
+	if err != nil {
+		return err
+	}
+
+	if !source.IsActive {
+		return nil
+	}
+
+	if settable, ok := source.Cfg.(SourceSettable); ok {
+		settable.SetAuthSource(source)
+	}
+
+	registerableSource, ok := source.Cfg.(RegisterableSource)
+	if !ok {
+		return nil
+	}
+
+	err = registerableSource.RegisterSource()
+	if err != nil {
+		// remove the AuthSource in case of errors while registering configuration
+		if _, err := db.GetEngine(ctx).ID(source.ID).Delete(new(Source)); err != nil {
+			log.Error("CreateSource: Error while wrapOpenIDConnectInitializeError: %v", err)
+		}
+	}
+	return err
+}
+
+type FindSourcesOptions struct {
+	db.ListOptions
+	IsActive  optional.Option[bool]
+	LoginType Type
+}
+
+func (opts FindSourcesOptions) ToConds() builder.Cond {
+	conds := builder.NewCond()
+	if opts.IsActive.Has() {
+		conds = conds.And(builder.Eq{"is_active": opts.IsActive.Value()})
+	}
+	if opts.LoginType != NoType {
+		conds = conds.And(builder.Eq{"`type`": opts.LoginType})
+	}
+	return conds
+}
+
+// IsSSPIEnabled returns true if there is at least one activated login
+// source of type LoginSSPI
+func IsSSPIEnabled(ctx context.Context) bool {
+	exist, err := db.Exist[Source](ctx, FindSourcesOptions{
+		IsActive:  optional.Some(true),
+		LoginType: SSPI,
+	}.ToConds())
+	if err != nil {
+		log.Error("IsSSPIEnabled: failed to query active SSPI sources: %v", err)
+		return false
+	}
+	return exist
+}
+
+// GetSourceByID returns login source by given ID.
+func GetSourceByID(ctx context.Context, id int64) (*Source, error) {
+	source := new(Source)
+	if id == 0 {
+		source.Cfg = registeredConfigs[NoType]()
+		// Set this source to active
+		// FIXME: allow disabling of db based password authentication in future
+		source.IsActive = true
+		return source, nil
+	}
+
+	has, err := db.GetEngine(ctx).ID(id).Get(source)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrSourceNotExist{id}
+	}
+	return source, nil
+}
+
+func GetSourceByName(ctx context.Context, name string) (*Source, error) {
+	source := &Source{}
+	has, err := db.GetEngine(ctx).Where("name = ?", name).Get(source)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrSourceNotExist{}
+	}
+	return source, nil
+}
+
+// UpdateSource updates a Source record in DB.
+func UpdateSource(ctx context.Context, source *Source) error {
+	var originalSource *Source
+	if source.IsOAuth2() {
+		// keep track of the original values so we can restore in case of errors while registering OAuth2 providers
+		var err error
+		if originalSource, err = GetSourceByID(ctx, source.ID); err != nil {
+			return err
+		}
+	}
+
+	has, err := db.GetEngine(ctx).Where("name=? AND id!=?", source.Name, source.ID).Exist(new(Source))
+	if err != nil {
+		return err
+	} else if has {
+		return ErrSourceAlreadyExist{source.Name}
+	}
+
+	_, err = db.GetEngine(ctx).ID(source.ID).AllCols().Update(source)
+	if err != nil {
+		return err
+	}
+
+	if !source.IsActive {
+		return nil
+	}
+
+	if settable, ok := source.Cfg.(SourceSettable); ok {
+		settable.SetAuthSource(source)
+	}
+
+	registerableSource, ok := source.Cfg.(RegisterableSource)
+	if !ok {
+		return nil
+	}
+
+	err = registerableSource.RegisterSource()
+	if err != nil {
+		// restore original values since we cannot update the provider it self
+		if _, err := db.GetEngine(ctx).ID(source.ID).AllCols().Update(originalSource); err != nil {
+			log.Error("UpdateSource: Error while wrapOpenIDConnectInitializeError: %v", err)
+		}
+	}
+	return err
+}
+
+// ErrSourceNotExist represents a "SourceNotExist" kind of error.
+type ErrSourceNotExist struct {
+	ID int64
+}
+
+// IsErrSourceNotExist checks if an error is a ErrSourceNotExist.
+func IsErrSourceNotExist(err error) bool {
+	_, ok := err.(ErrSourceNotExist)
+	return ok
+}
+
+func (err ErrSourceNotExist) Error() string {
+	return fmt.Sprintf("login source does not exist [id: %d]", err.ID)
+}
+
+// Unwrap unwraps this as a ErrNotExist err
+func (err ErrSourceNotExist) Unwrap() error {
+	return util.ErrNotExist
+}
+
+// ErrSourceAlreadyExist represents a "SourceAlreadyExist" kind of error.
+type ErrSourceAlreadyExist struct {
+	Name string
+}
+
+// IsErrSourceAlreadyExist checks if an error is a ErrSourceAlreadyExist.
+func IsErrSourceAlreadyExist(err error) bool {
+	_, ok := err.(ErrSourceAlreadyExist)
+	return ok
+}
+
+func (err ErrSourceAlreadyExist) Error() string {
+	return fmt.Sprintf("login source already exists [name: %s]", err.Name)
+}
+
+// Unwrap unwraps this as a ErrExist err
+func (err ErrSourceAlreadyExist) Unwrap() error {
+	return util.ErrAlreadyExist
+}
+
+// ErrSourceInUse represents a "SourceInUse" kind of error.
+type ErrSourceInUse struct {
+	ID int64
+}
+
+// IsErrSourceInUse checks if an error is a ErrSourceInUse.
+func IsErrSourceInUse(err error) bool {
+	_, ok := err.(ErrSourceInUse)
+	return ok
+}
+
+func (err ErrSourceInUse) Error() string {
+	return fmt.Sprintf("login source is still used by some users [id: %d]", err.ID)
+}