From dd136858f1ea40ad3c94191d647487fa4f31926c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel@debian.org>
Date: Fri, 18 Oct 2024 20:33:49 +0200
Subject: Adding upstream version 9.0.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>
---
 services/auth/source/pam/assert_interface_test.go | 21 +++++++
 services/auth/source/pam/source.go                | 45 ++++++++++++++
 services/auth/source/pam/source_authenticate.go   | 76 +++++++++++++++++++++++
 3 files changed, 142 insertions(+)
 create mode 100644 services/auth/source/pam/assert_interface_test.go
 create mode 100644 services/auth/source/pam/source.go
 create mode 100644 services/auth/source/pam/source_authenticate.go

(limited to 'services/auth/source/pam')

diff --git a/services/auth/source/pam/assert_interface_test.go b/services/auth/source/pam/assert_interface_test.go
new file mode 100644
index 0000000..8e7648b
--- /dev/null
+++ b/services/auth/source/pam/assert_interface_test.go
@@ -0,0 +1,21 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pam_test
+
+import (
+	auth_model "code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/services/auth"
+	"code.gitea.io/gitea/services/auth/source/pam"
+)
+
+// This test file exists to assert that our Source exposes the interfaces that we expect
+// It tightly binds the interfaces and implementation without breaking go import cycles
+
+type sourceInterface interface {
+	auth.PasswordAuthenticator
+	auth_model.Config
+	auth_model.SourceSettable
+}
+
+var _ (sourceInterface) = &pam.Source{}
diff --git a/services/auth/source/pam/source.go b/services/auth/source/pam/source.go
new file mode 100644
index 0000000..96b182e
--- /dev/null
+++ b/services/auth/source/pam/source.go
@@ -0,0 +1,45 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pam
+
+import (
+	"code.gitea.io/gitea/models/auth"
+	"code.gitea.io/gitea/modules/json"
+)
+
+// __________  _____      _____
+// \______   \/  _  \    /     \
+//  |     ___/  /_\  \  /  \ /  \
+//  |    |  /    |    \/    Y    \
+//  |____|  \____|__  /\____|__  /
+//                  \/         \/
+
+// Source holds configuration for the PAM login source.
+type Source struct {
+	ServiceName    string // pam service (e.g. system-auth)
+	EmailDomain    string
+	SkipLocalTwoFA bool `json:",omitempty"` // Skip Local 2fa for users authenticated with this source
+
+	// reference to the authSource
+	authSource *auth.Source
+}
+
+// FromDB fills up a PAMConfig from serialized format.
+func (source *Source) FromDB(bs []byte) error {
+	return json.UnmarshalHandleDoubleEncode(bs, &source)
+}
+
+// ToDB exports a PAMConfig to a serialized format.
+func (source *Source) ToDB() ([]byte, error) {
+	return json.Marshal(source)
+}
+
+// SetAuthSource sets the related AuthSource
+func (source *Source) SetAuthSource(authSource *auth.Source) {
+	source.authSource = authSource
+}
+
+func init() {
+	auth.RegisterTypeConfig(auth.PAM, &Source{})
+}
diff --git a/services/auth/source/pam/source_authenticate.go b/services/auth/source/pam/source_authenticate.go
new file mode 100644
index 0000000..addd1bd
--- /dev/null
+++ b/services/auth/source/pam/source_authenticate.go
@@ -0,0 +1,76 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pam
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"code.gitea.io/gitea/models/auth"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/auth/pam"
+	"code.gitea.io/gitea/modules/optional"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/google/uuid"
+)
+
+// Authenticate queries if login/password is valid against the PAM,
+// and create a local user if success when enabled.
+func (source *Source) Authenticate(ctx context.Context, user *user_model.User, userName, password string) (*user_model.User, error) {
+	pamLogin, err := pam.Auth(source.ServiceName, userName, password)
+	if err != nil {
+		if strings.Contains(err.Error(), "Authentication failure") {
+			return nil, user_model.ErrUserNotExist{Name: userName}
+		}
+		return nil, err
+	}
+
+	if user != nil {
+		return user, nil
+	}
+
+	// Allow PAM sources with `@` in their name, like from Active Directory
+	username := pamLogin
+	email := pamLogin
+	idx := strings.Index(pamLogin, "@")
+	if idx > -1 {
+		username = pamLogin[:idx]
+	}
+	if user_model.ValidateEmail(email) != nil {
+		if source.EmailDomain != "" {
+			email = fmt.Sprintf("%s@%s", username, source.EmailDomain)
+		} else {
+			email = fmt.Sprintf("%s@%s", username, setting.Service.NoReplyAddress)
+		}
+		if user_model.ValidateEmail(email) != nil {
+			email = uuid.New().String() + "@localhost"
+		}
+	}
+
+	user = &user_model.User{
+		LowerName:   strings.ToLower(username),
+		Name:        username,
+		Email:       email,
+		Passwd:      password,
+		LoginType:   auth.PAM,
+		LoginSource: source.authSource.ID,
+		LoginName:   userName, // This is what the user typed in
+	}
+	overwriteDefault := &user_model.CreateUserOverwriteOptions{
+		IsActive: optional.Some(true),
+	}
+
+	if err := user_model.CreateUser(ctx, user, overwriteDefault); err != nil {
+		return user, err
+	}
+
+	return user, nil
+}
+
+// IsSkipLocalTwoFA returns if this source should skip local 2fa for password authentication
+func (source *Source) IsSkipLocalTwoFA() bool {
+	return source.SkipLocalTwoFA
+}
-- 
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