Add single sign-on support via SSPI on Windows (#8463)

* Add single sign-on support via SSPI on Windows

* Ensure plugins implement interface

* Ensure plugins implement interface

* Move functions used only by the SSPI auth method to sspi_windows.go

* Field SSPISeparatorReplacement of AuthenticationForm should not be required via binding, as binding will insist the field is non-empty even if another login type is selected

* Fix breaking of oauth authentication on download links. Do not create new session with SSPI authentication on download links.

* Update documentation for the new 'SPNEGO with SSPI' login source

* Mention in documentation that ROOT_URL should contain the FQDN of the server

* Make sure that Contexter is not checking for active login sources when the ORM engine is not initialized (eg. when installing)

* Always initialize and free SSO methods, even if they are not enabled, as a method can be activated while the app is running (from Authentication sources)

* Add option in SSPIConfig for removing of domains from logon names

* Update helper text for StripDomainNames option

* Make sure handleSignIn() is called after a new user object is created by SSPI auth method

* Remove default value from text of form field helper

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Remove default value from text of form field helper

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Remove default value from text of form field helper

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Only make a query to the DB to check if SSPI is enabled on handlers that need that information for templates

* Remove code duplication

* Log errors in ActiveLoginSources

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Revert suffix of randomly generated E-mails for Reverse proxy authentication

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Revert unneeded white-space change in template

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Add copyright comments at the top of new files

* Use loopback name for randomly generated emails

* Add locale tag for the SSPISeparatorReplacement field with proper casing

* Revert casing of SSPISeparatorReplacement field in locale file, moving it up, next to other form fields

* Update docs/content/doc/features/authentication.en-us.md

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

* Remove Priority() method and define the order in which SSO auth methods should be executed in one place

* Log authenticated username only if it's not empty

* Rephrase helper text for automatic creation of users

* Return error if more than one active SSPI auth source is found

* Change newUser() function to return error, letting caller log/handle the error

* Move isPublicResource, isPublicPage and handleSignIn functions outside SSPI auth method to allow other SSO methods to reuse them if needed

* Refactor initialization of the list containing SSO auth methods

* Validate SSPI settings on POST

* Change SSPI to only perform authentication on its own login page, API paths and download links. Leave Toggle middleware to redirect non authenticated users to login page

* Make 'Default language' in SSPI config empty, unless changed by admin

* Show error if admin tries to add a second authentication source of type SSPI

* Simplify declaration of global variable

* Rebuild gitgraph.js on Linux

* Make sure config values containing only whitespace are not accepted

4 files changed, 101 insertions, 1 deletions

diff --git a/templates/admin/auth/edit.tmpl b/templates/admin/auth/edit.tmpl
index 6a176a43a8..d1a614b1f0 100644
--- a/templates/admin/auth/edit.tmpl
+++ b/templates/admin/auth/edit.tmpl
@@ -213,6 +213,52 @@
 					{{end}}{{end}}
 				{{end}}
 
+				<!-- SSPI -->
+				{{if .Source.IsSSPI}}
+					{{ $cfg:=.Source.SSPI }}
+					<div class="field">
+						<div class="ui checkbox">
+							<label for="sspi_auto_create_users"><strong>{{.i18n.Tr "admin.auths.sspi_auto_create_users"}}</strong></label>
+							<input id="sspi_auto_create_users" name="sspi_auto_create_users" class="sspi-auto-create-users" type="checkbox" {{if $cfg.AutoCreateUsers}}checked{{end}}>
+							<p class="help">{{.i18n.Tr "admin.auths.sspi_auto_create_users_helper"}}</p>
+						</div>
+					</div>
+					<div class="field">
+						<div class="ui checkbox">
+							<label for="sspi_auto_activate_users"><strong>{{.i18n.Tr "admin.auths.sspi_auto_activate_users"}}</strong></label>
+							<input id="sspi_auto_activate_users" name="sspi_auto_activate_users" class="sspi-auto-activate-users" type="checkbox" {{if $cfg.AutoActivateUsers}}checked{{end}}>
+							<p class="help">{{.i18n.Tr "admin.auths.sspi_auto_activate_users_helper"}}</p>
+						</div>
+					</div>
+					<div class="field">
+						<div class="ui checkbox">
+							<label for="sspi_strip_domain_names"><strong>{{.i18n.Tr "admin.auths.sspi_strip_domain_names"}}</strong></label>
+							<input id="sspi_strip_domain_names" name="sspi_strip_domain_names" class="sspi-strip-domain-names" type="checkbox" {{if $cfg.StripDomainNames}}checked{{end}}>
+							<p class="help">{{.i18n.Tr "admin.auths.sspi_strip_domain_names_helper"}}</p>
+						</div>
+					</div>
+					<div class="required field">
+						<label for="sspi_separator_replacement">{{.i18n.Tr "admin.auths.sspi_separator_replacement"}}</label>
+						<input id="sspi_separator_replacement" name="sspi_separator_replacement" value="{{$cfg.SeparatorReplacement}}" required>
+						<p class="help">{{.i18n.Tr "admin.auths.sspi_separator_replacement_helper"}}</p>
+					</div>
+					<div class="field">
+						<label for="sspi_default_language">{{.i18n.Tr "admin.auths.sspi_default_language"}}</label>
+						<div class="ui language selection dropdown" id="sspi_default_language">
+							<input name="sspi_default_language" type="hidden" value="{{$cfg.DefaultLanguage}}">
+							<i class="dropdown icon"></i>
+							<div class="text">{{range .AllLangs}}{{if eq $cfg.DefaultLanguage .Lang}}{{.Name}}{{end}}{{end}}</div>
+							<div class="menu">
+								<div class="item{{if not $.SSPIDefaultLanguage}} active selected{{end}}" data-value="">-</div>
+							{{range .AllLangs}}
+								<div class="item{{if eq $cfg.DefaultLanguage .Lang}} active selected{{end}}" data-value="{{.Lang}}">{{.Name}}</div>
+							{{end}}
+							</div>
+						</div>
+						<p class="help">{{.i18n.Tr "admin.auths.sspi_default_language_helper"}}</p>
+					</div>
+				{{end}}
+
 				<div class="inline field {{if not .Source.IsSMTP}}hide{{end}}">
 					<div class="ui checkbox">
 						<label><strong>{{.i18n.Tr "admin.auths.enable_tls"}}</strong></label>
diff --git a/templates/admin/auth/new.tmpl b/templates/admin/auth/new.tmpl
index e759ec0ba4..f2fc26cdc8 100644
--- a/templates/admin/auth/new.tmpl
+++ b/templates/admin/auth/new.tmpl
@@ -43,6 +43,9 @@
 				<!-- OAuth2 -->
 				{{ template "admin/auth/source/oauth" . }}
 
+				<!-- SSPI -->
+				{{ template "admin/auth/source/sspi" . }}
+
 				<div class="ldap field">
 					<div class="ui checkbox">
 						<label><strong>{{.i18n.Tr "admin.auths.attributes_in_bind"}}</strong></label>
diff --git a/templates/admin/auth/source/sspi.tmpl b/templates/admin/auth/source/sspi.tmpl
new file mode 100644
index 0000000000..50f9f99a8d
--- /dev/null
+++ b/templates/admin/auth/source/sspi.tmpl
@@ -0,0 +1,43 @@
+<div class="sspi field {{if not (eq .type 7)}}hide{{end}}">
+	<div class="field">
+		<div class="ui checkbox">
+			<label for="sspi_auto_create_users"><strong>{{.i18n.Tr "admin.auths.sspi_auto_create_users"}}</strong></label>
+			<input id="sspi_auto_create_users" name="sspi_auto_create_users" class="sspi-auto-create-users" type="checkbox" {{if .SSPIAutoCreateUsers}}checked{{end}}>
+			<p class="help">{{.i18n.Tr "admin.auths.sspi_auto_create_users_helper"}}</p>
+		</div>
+	</div>
+	<div class="field">
+		<div class="ui checkbox">
+			<label for="sspi_auto_activate_users"><strong>{{.i18n.Tr "admin.auths.sspi_auto_activate_users"}}</strong></label>
+			<input id="sspi_auto_activate_users" name="sspi_auto_activate_users" class="sspi-auto-activate-users" type="checkbox" {{if .SSPIAutoActivateUsers}}checked{{end}}>
+			<p class="help">{{.i18n.Tr "admin.auths.sspi_auto_activate_users_helper"}}</p>
+		</div>
+	</div>
+	<div class="field">
+		<div class="ui checkbox">
+			<label for="sspi_strip_domain_names"><strong>{{.i18n.Tr "admin.auths.sspi_strip_domain_names"}}</strong></label>
+			<input id="sspi_strip_domain_names" name="sspi_strip_domain_names" class="sspi-strip-domain-names" type="checkbox" {{if .SSPIStripDomainNames}}checked{{end}}>
+			<p class="help">{{.i18n.Tr "admin.auths.sspi_strip_domain_names_helper"}}</p>
+		</div>
+	</div>
+	<div class="required field">
+		<label for="sspi_separator_replacement">{{.i18n.Tr "admin.auths.sspi_separator_replacement"}}</label>
+		<input id="sspi_separator_replacement" name="sspi_separator_replacement" value="{{.SSPISeparatorReplacement}}">
+		<p class="help">{{.i18n.Tr "admin.auths.sspi_separator_replacement_helper"}}</p>
+	</div>
+	<div class="field">
+		<label for="sspi_default_language">{{.i18n.Tr "admin.auths.sspi_default_language"}}</label>
+		<div class="ui language selection dropdown" id="sspi_default_language">
+			<input name="sspi_default_language" type="hidden" value="{{.SSPIDefaultLanguage}}">
+			<i class="dropdown icon"></i>
+			<div class="text">{{range .AllLangs}}{{if eq $.SSPIDefaultLanguage .Lang}}{{.Name}}{{end}}{{end}}</div>
+			<div class="menu">
+				<div class="item{{if not $.SSPIDefaultLanguage}} active selected{{end}}" data-value="">-</div>
+			{{range .AllLangs}}
+				<div class="item{{if eq $.SSPIDefaultLanguage .Lang}} active selected{{end}}" data-value="{{.Lang}}">{{.Name}}</div>
+			{{end}}
+			</div>
+		</div>
+		<p class="help">{{.i18n.Tr "admin.auths.sspi_default_language_helper"}}</p>
+	</div>
+</div>
diff --git a/templates/user/auth/signin_navbar.tmpl b/templates/user/auth/signin_navbar.tmpl
index 345e221296..428a3d843a 100644
--- a/templates/user/auth/signin_navbar.tmpl
+++ b/templates/user/auth/signin_navbar.tmpl
@@ -1,11 +1,19 @@
-{{if .EnableOpenIDSignIn}}
+{{if or .EnableOpenIDSignIn .EnableSSPI}}
 <div class="ui secondary pointing tabular top attached borderless menu new-menu navbar">
 	<a class="{{if .PageIsLogin}}active{{end}} item" rel="nofollow" href="{{AppSubUrl}}/user/login">
 		{{.i18n.Tr "auth.login_userpass"}}
 	</a>
+	{{if .EnableOpenIDSignIn}}
 	<a class="{{if .PageIsLoginOpenID}}active{{end}} item" rel="nofollow" href="{{AppSubUrl}}/user/login/openid">
 		<i class="fa fa-openid"></i>
 		&nbsp;OpenID
 	</a>
+	{{end}}
+	{{if .EnableSSPI}}
+	<a class="item" rel="nofollow" href="{{AppSubUrl}}/user/login?auth_with_sspi=1">
+		<i class="fa fa-windows"></i>
+		&nbsp;SSPI
+	</a>
+	{{end}}
 </div>
 {{end}}