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From 75131b469fa9e1e2e3cb623fa1f3d36cba36af78 Mon Sep 17 00:00:00 2001
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From: Victor Toso <me@victortoso.com>
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Date: Wed, 11 May 2016 19:34:13 +0200
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Subject: [PATCH] logind: introduce LockedHint and SetLockedHint (#3238)
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Desktop environments can keep this property up to date to allow
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applications to easily track session's Lock status.
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Cherry-picked from: 42d35e1301928d08dd32ec51f0205252ae658ba5
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Resolves: #1335499
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---
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 src/login/logind-session-dbus.c       | 50 +++++++++++++++++++++++++++
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 src/login/logind-session.c            | 17 +++++++++
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 src/login/logind-session.h            |  4 +++
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 src/login/org.freedesktop.login1.conf |  4 +++
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 4 files changed, 75 insertions(+)
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diff --git a/src/login/logind-session-dbus.c b/src/login/logind-session-dbus.c
Pablo Greco 48fc63
index 4e7edef52d..75b7186e8f 100644
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--- a/src/login/logind-session-dbus.c
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+++ b/src/login/logind-session-dbus.c
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@@ -180,6 +180,24 @@ static int property_get_idle_since_hint(
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         return sd_bus_message_append(reply, "t", u);
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 }
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+static int property_get_locked_hint(
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+                sd_bus *bus,
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+                const char *path,
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+                const char *interface,
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+                const char *property,
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+                sd_bus_message *reply,
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+                void *userdata,
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+                sd_bus_error *error) {
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+
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+        Session *s = userdata;
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+
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+        assert(bus);
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+        assert(reply);
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+        assert(s);
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+
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+        return sd_bus_message_append(reply, "b", session_get_locked_hint(s) > 0);
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+}
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+
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 static int method_terminate(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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         Session *s = userdata;
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         int r;
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@@ -255,6 +273,36 @@ static int method_set_idle_hint(sd_bus *bus, sd_bus_message *message, void *user
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         return sd_bus_reply_method_return(message, NULL);
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 }
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+static int method_set_locked_hint(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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+        _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
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+        Session *s = userdata;
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+        uid_t uid;
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+        int r, b;
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+
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+        assert(bus);
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+        assert(message);
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+        assert(s);
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+
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+        r = sd_bus_message_read(message, "b", &b);
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+        if (r < 0)
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+                return r;
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+
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+        r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
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+        if (r < 0)
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+                return r;
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+
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+        r = sd_bus_creds_get_euid(creds, &uid);
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+        if (r < 0)
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+                return r;
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+
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+        if (uid != 0 && uid != s->user->uid)
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+                return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set locked hint");
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+
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+        session_set_locked_hint(s, b);
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+
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+        return sd_bus_reply_method_return(message, NULL);
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+}
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+
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 static int method_kill(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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         Session *s = userdata;
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         const char *swho;
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@@ -455,6 +503,7 @@ const sd_bus_vtable session_vtable[] = {
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         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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+        SD_BUS_PROPERTY("LockedHint", "b", property_get_locked_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
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         SD_BUS_METHOD("Terminate", NULL, NULL, method_terminate, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
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         SD_BUS_METHOD("Activate", NULL, NULL, method_activate, SD_BUS_VTABLE_UNPRIVILEGED),
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@@ -462,6 +511,7 @@ const sd_bus_vtable session_vtable[] = {
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         SD_BUS_METHOD("Unlock", NULL, NULL, method_lock, 0),
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         SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("Kill", "si", NULL, method_kill, SD_BUS_VTABLE_CAPABILITY(CAP_KILL)),
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+        SD_BUS_METHOD("SetLockedHint", "b", NULL, method_set_locked_hint, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("TakeControl", "b", NULL, method_take_control, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("ReleaseControl", NULL, NULL, method_release_control, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("TakeDevice", "uu", "hb", method_take_device, SD_BUS_VTABLE_UNPRIVILEGED),
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diff --git a/src/login/logind-session.c b/src/login/logind-session.c
Pablo Greco 48fc63
index d2e7b40124..dc24539f12 100644
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--- a/src/login/logind-session.c
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+++ b/src/login/logind-session.c
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@@ -843,6 +843,23 @@ void session_set_idle_hint(Session *s, bool b) {
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         manager_send_changed(s->manager, "IdleHint", "IdleSinceHint", "IdleSinceHintMonotonic", NULL);
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 }
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+int session_get_locked_hint(Session *s) {
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+        assert(s);
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+
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+        return s->locked_hint;
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+}
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+
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+void session_set_locked_hint(Session *s, bool b) {
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+        assert(s);
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+
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+        if (s->locked_hint == b)
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+                return;
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+
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+        s->locked_hint = b;
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+
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+        session_send_changed(s, "LockedHint", NULL);
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+}
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+
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 static int session_dispatch_fifo(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
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         Session *s = userdata;
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diff --git a/src/login/logind-session.h b/src/login/logind-session.h
Pablo Greco 48fc63
index a007fb5e84..5002b68689 100644
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--- a/src/login/logind-session.h
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+++ b/src/login/logind-session.h
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@@ -111,6 +111,8 @@ struct Session {
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         bool idle_hint;
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         dual_timestamp idle_hint_timestamp;
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+        bool locked_hint;
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+
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         bool in_gc_queue:1;
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         bool started:1;
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         bool stopping:1;
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@@ -137,6 +139,8 @@ int session_activate(Session *s);
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 bool session_is_active(Session *s);
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 int session_get_idle_hint(Session *s, dual_timestamp *t);
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 void session_set_idle_hint(Session *s, bool b);
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+int session_get_locked_hint(Session *s);
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+void session_set_locked_hint(Session *s, bool b);
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 int session_create_fifo(Session *s);
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 int session_start(Session *s);
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 int session_stop(Session *s, bool force);
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diff --git a/src/login/org.freedesktop.login1.conf b/src/login/org.freedesktop.login1.conf
Pablo Greco 48fc63
index 1318328aa0..dc7e0bec20 100644
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--- a/src/login/org.freedesktop.login1.conf
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+++ b/src/login/org.freedesktop.login1.conf
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@@ -160,6 +160,10 @@
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                        send_interface="org.freedesktop.login1.Session"
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                        send_member="SetIdleHint"/>
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+                
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+                       send_interface="org.freedesktop.login1.Session"
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+                       send_member="SetLockedHint"/>
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+
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                        send_interface="org.freedesktop.login1.Session"
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                        send_member="TakeControl"/>