From d39ed7b722761e5110e26c8e937782ecb24b7315 Mon Sep 17 00:00:00 2001
From: Ray Strode <rstrode@redhat.com>
Date: Wed, 26 Jul 2017 13:28:50 -0400
Subject: daemon: add ChoiceList PAM extension

This commit adds one PAM extension, a "Choice List" using the
new PAM_BINARY_PROMPT protocol added in the previous commit.  The
PAM module sends a list of (key, row text) pairs, and GDM ferries
the request to gnome-shell using a new user verifier sub-interface.

gnome-shell should present the list to the user and pass back the
corresponding key, which GDM ferries back to the PAM module.

Note this commit is only the daemon side. A subsequent commit will
add the libgdm API needed for gnome-shell to actually deal with
this new PAM extension.

https://bugzilla.gnome.org/show_bug.cgi?id=788851
---
 pam-extensions/gdm-pam-extensions.h | 45 +++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'pam-extensions')

diff --git a/pam-extensions/gdm-pam-extensions.h b/pam-extensions/gdm-pam-extensions.h
index eff2f40a..cecb7422 100644
--- a/pam-extensions/gdm-pam-extensions.h
+++ b/pam-extensions/gdm-pam-extensions.h
@@ -130,4 +130,49 @@ typedef struct {
 
 #define GDM_PAM_EXTENSION_SUPPORTED(name) GDM_PAM_EXTENSION_LOOK_UP_TYPE(name, (unsigned char *) NULL)
 
+typedef struct {
+        const char *key;
+        const char *text;
+} GdmChoiceListItems;
+
+typedef struct {
+        size_t number_of_items;
+        GdmChoiceListItems items[];
+} GdmChoiceList;
+
+typedef struct {
+        GdmPamExtensionMessage header;
+
+        char *prompt_message;
+        GdmChoiceList list;
+} GdmPamExtensionChoiceListRequest;
+
+typedef struct {
+        GdmPamExtensionMessage header;
+
+        char *key;
+} GdmPamExtensionChoiceListResponse;
+
+#define GDM_PAM_EXTENSION_CHOICE_LIST "org.gnome.DisplayManager.UserVerifier.ChoiceList"
+
+#define GDM_CHOICE_LIST_SIZE(num_items) (offsetof(GdmChoiceList, items) + (num_items) * sizeof (GdmChoiceListItems))
+#define GDM_PAM_EXTENSION_CHOICE_LIST_REQUEST_SIZE(num_items) (offsetof(GdmPamExtensionChoiceListRequest, list) + GDM_CHOICE_LIST_SIZE((num_items)))
+#define GDM_PAM_EXTENSION_CHOICE_LIST_REQUEST_INIT(request, title, num_items) \
+{ \
+        int _n = num_items; \
+        GDM_PAM_EXTENSION_LOOK_UP_TYPE (GDM_PAM_EXTENSION_CHOICE_LIST, &request->header.type); \
+        request->header.length = htobe32 (GDM_PAM_EXTENSION_CHOICE_LIST_REQUEST_SIZE(_n)); \
+        request->prompt_message = title; \
+        request->list.number_of_items = _n; \
+}
+
+#define GDM_PAM_EXTENSION_CHOICE_LIST_RESPONSE_SIZE sizeof (GdmPamExtensionChoiceListResponse)
+#define GDM_PAM_EXTENSION_CHOICE_LIST_RESPONSE_INIT(response) \
+{ \
+        GDM_PAM_EXTENSION_LOOK_UP_TYPE (GDM_PAM_EXTENSION_CHOICE_LIST, &response->header.type); \
+        response->header.length = htobe32 (GDM_PAM_EXTENSION_CHOICE_LIST_RESPONSE_SIZE); \
+        response->key = NULL; \
+}
+#define GDM_PAM_EXTENSION_REPLY_TO_CHOICE_LIST_RESPONSE(reply) ((GdmPamExtensionChoiceListResponse *) (void *) reply->resp)
+
 #endif
-- 
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