1 files changed, 125 insertions, 0 deletions
diff --git a/modules/auth/sso/basic.go b/modules/auth/sso/basic.go
new file mode 100644
index 0000000000..7f1841df71
--- /dev/null
+++ b/modules/auth/sso/basic.go
@@ -0,0 +1,125 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package sso
+
+import (
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
+
+	"gitea.com/macaron/macaron"
+	"gitea.com/macaron/session"
+)
+
+// Ensure the struct implements the interface.
+var (
+	_ SingleSignOn = &Basic{}
+)
+
+// Basic implements the SingleSignOn interface and authenticates requests (API requests
+// only) by looking for Basic authentication data or "x-oauth-basic" token in the "Authorization"
+// header.
+type Basic struct {
+}
+
+// Init does nothing as the Basic implementation does not need to allocate any resources
+func (b *Basic) Init() error {
+	return nil
+}
+
+// Free does nothing as the Basic implementation does not have to release any resources
+func (b *Basic) Free() error {
+	return nil
+}
+
+// IsEnabled returns true as this plugin is enabled by default and its not possible to disable
+// it from settings.
+func (b *Basic) IsEnabled() bool {
+	return setting.Service.EnableBasicAuth
+}
+
+// VerifyAuthData extracts and validates Basic data (username and password/token) from the
+// "Authorization" header of the request and returns the corresponding user object for that
+// name/token on successful validation.
+// Returns nil if header is empty or validation fails.
+func (b *Basic) VerifyAuthData(ctx *macaron.Context, sess session.Store) *models.User {
+	baHead := ctx.Req.Header.Get("Authorization")
+	if len(baHead) == 0 {
+		return nil
+	}
+
+	auths := strings.Fields(baHead)
+	if len(auths) != 2 || auths[0] != "Basic" {
+		return nil
+	}
+
+	var u *models.User
+	uname, passwd, _ := base.BasicAuthDecode(auths[1])
+
+	// Check if username or password is a token
+	isUsernameToken := len(passwd) == 0 || passwd == "x-oauth-basic"
+	// Assume username is token
+	authToken := uname
+	if !isUsernameToken {
+		// Assume password is token
+		authToken = passwd
+	}
+
+	uid := CheckOAuthAccessToken(authToken)
+	if uid != 0 {
+		var err error
+		ctx.Data["IsApiToken"] = true
+
+		u, err = models.GetUserByID(uid)
+		if err != nil {
+			log.Error("GetUserByID:  %v", err)
+			return nil
+		}
+	}
+	token, err := models.GetAccessTokenBySHA(authToken)
+	if err == nil {
+		if isUsernameToken {
+			u, err = models.GetUserByID(token.UID)
+			if err != nil {
+				log.Error("GetUserByID:  %v", err)
+				return nil
+			}
+		} else {
+			u, err = models.GetUserByName(uname)
+			if err != nil {
+				log.Error("GetUserByID:  %v", err)
+				return nil
+			}
+			if u.ID != token.UID {
+				return nil
+			}
+		}
+		token.UpdatedUnix = timeutil.TimeStampNow()
+		if err = models.UpdateAccessToken(token); err != nil {
+			log.Error("UpdateAccessToken:  %v", err)
+		}
+	} else if !models.IsErrAccessTokenNotExist(err) && !models.IsErrAccessTokenEmpty(err) {
+		log.Error("GetAccessTokenBySha: %v", err)
+	}
+
+	if u == nil {
+		u, err = models.UserSignIn(uname, passwd)
+		if err != nil {
+			if !models.IsErrUserNotExist(err) {
+				log.Error("UserSignIn: %v", err)
+			}
+			return nil
+		}
+	} else {
+		ctx.Data["IsApiToken"] = true
+	}
+
+	return u
+}