From 4acf0cfd2f92edb94ad48d04f1ce6c9ab4e19d55 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 22 Jan 2020 12:04:38 +0100
Subject: [PATCH] logind: check PolicyKit before allowing VT switch

Let's lock this down a bit. Effectively nothing much changes, since the
default PK policy will allow users on the VT to change VT. Only users
with no local VT session won't be able to switch VTs.
Reference: https://github.com/systemd/systemd/commit/4acf0cfd2f92edb94ad48d04f1ce6c9ab4e19d55
Conflict: NA
---
 src/login/logind-dbus.c                 | 16 +++++++
 src/login/logind-seat-dbus.c            | 58 ++++++++++++++++++++++++-
 src/login/logind-session-dbus.c         | 14 ++++++
 src/login/org.freedesktop.login1.policy | 10 +++++
 4 files changed, 97 insertions(+), 1 deletion(-)

diff --git a/src/login/logind-dbus.c b/src/login/logind-dbus.c
index 8017aa5c3c..52a7ea3c77 100644
--- a/src/login/logind-dbus.c
+++ b/src/login/logind-dbus.c
@@ -1016,6 +1016,8 @@ static int method_activate_session(sd_bus_message *message, void *userdata, sd_b
         if (r < 0)
                 return r;
 
+        /* PolicyKit is done by bus_session_method_activate() */
+
         return bus_session_method_activate(message, session, error);
 }
 
@@ -1047,6 +1049,20 @@ static int method_activate_session_on_seat(sd_bus_message *message, void *userda
                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT,
                                          "Session %s not on seat %s", session_name, seat_name);
 
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &m->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
         r = session_activate(session);
         if (r < 0)
                 return r;
diff --git a/src/login/logind-seat-dbus.c b/src/login/logind-seat-dbus.c
index 5b41e60fd6..0a5df937cc 100644
--- a/src/login/logind-seat-dbus.c
+++ b/src/login/logind-seat-dbus.c
@@ -178,6 +178,20 @@ static int method_activate_session(sd_bus_message *message, void *userdata, sd_b
         if (session->seat != s)
                 return sd_bus_error_setf(error, BUS_ERROR_SESSION_NOT_ON_SEAT, "Session %s not on seat %s", name, s->id);
 
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &s->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
         r = session_activate(session);
         if (r < 0)
                 return r;
@@ -198,7 +212,21 @@ static int method_switch_to(sd_bus_message *message, void *userdata, sd_bus_erro
                 return r;
 
         if (to <= 0)
-                return -EINVAL;
+                return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid virtual terminal");
+
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &s->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
 
         r = seat_switch_to(s, to);
         if (r < 0)
@@ -214,6 +242,20 @@ static int method_switch_to_next(sd_bus_message *message, void *userdata, sd_bus
         assert(message);
         assert(s);
 
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &s->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
         r = seat_switch_to_next(s);
         if (r < 0)
                 return r;
@@ -228,6 +270,20 @@ static int method_switch_to_previous(sd_bus_message *message, void *userdata, sd
         assert(message);
         assert(s);
 
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &s->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
         r = seat_switch_to_previous(s);
         if (r < 0)
                 return r;
diff --git a/src/login/logind-session-dbus.c b/src/login/logind-session-dbus.c
index 3738514282..80ec89ba0a 100644
--- a/src/login/logind-session-dbus.c
+++ b/src/login/logind-session-dbus.c
@@ -191,6 +191,20 @@ int bus_session_method_activate(sd_bus_message *message, void *userdata, sd_bus_
         assert(message);
         assert(s);
 
+        r = bus_verify_polkit_async(
+                        message,
+                        CAP_SYS_ADMIN,
+                        "org.freedesktop.login1.chvt",
+                        NULL,
+                        false,
+                        UID_INVALID,
+                        &s->manager->polkit_registry,
+                        error);
+        if (r < 0)
+                return r;
+        if (r == 0)
+                return 1; /* Will call us back */
+
         r = session_activate(s);
         if (r < 0)
                 return r;
diff --git a/src/login/org.freedesktop.login1.policy b/src/login/org.freedesktop.login1.policy
index 6dc79aa32a..a269c8e313 100644
--- a/src/login/org.freedesktop.login1.policy
+++ b/src/login/org.freedesktop.login1.policy
@@ -391,4 +391,14 @@
                 </defaults>
         </action>
 
+        <action id="org.freedesktop.login1.chvt">
+                <description gettext-domain="systemd">Change Session</description>
+                <message gettext-domain="systemd">Authentication is required for changing the virtual terminal.</message>
+                <defaults>
+                        <allow_any>auth_admin_keep</allow_any>
+                        <allow_inactive>auth_admin_keep</allow_inactive>
+                        <allow_active>yes</allow_active>
+                </defaults>
+        </action>
+
 </policyconfig>
-- 
2.23.0