tigervnc/SOURCES/tigervnc-selinux-restore-context-in-case-of-different-policies.patch

From d2d52704624ce841f4a392fccd82079d87ff13b6 Mon Sep 17 00:00:00 2001
From: Jan Grulich <jgrulich@redhat.com>
Date: Thu, 11 Nov 2021 13:52:41 +0100
Subject: [PATCH] SELinux: restore SELinux context in case of different
 policies

---
 CMakeLists.txt                | 13 +++++++++++++
 unix/vncserver/CMakeLists.txt |  2 +-
 unix/vncserver/vncsession.c   | 16 ++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 50247c7da..1708eb3d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -268,6 +268,19 @@ if(UNIX AND NOT APPLE)
   endif()
 endif()

+# Check for SELinux library
+if(UNIX AND NOT APPLE)
+  check_include_files(selinux/selinux.h HAVE_SELINUX_H)
+  if(HAVE_SELINUX_H)
+    set(CMAKE_REQUIRED_LIBRARIES -lselinux)
+    set(CMAKE_REQUIRED_LIBRARIES)
+    set(SELINUX_LIBS selinux)
+    add_definitions("-DHAVE_SELINUX")
+  else()
+    message(WARNING "Could not find SELinux development files")
+  endif()
+endif()
+
 # Generate config.h and make sure the source finds it
 configure_file(config.h.in config.h)
 add_definitions(-DHAVE_CONFIG_H)
diff --git a/unix/vncserver/CMakeLists.txt b/unix/vncserver/CMakeLists.txt
index f65ccc7db..ae69dc098 100644
--- a/unix/vncserver/CMakeLists.txt
+++ b/unix/vncserver/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_executable(vncsession vncsession.c)
-target_link_libraries(vncsession ${PAM_LIBS})
+target_link_libraries(vncsession ${PAM_LIBS} ${SELINUX_LIBS})

 configure_file(vncserver@.service.in vncserver@.service @ONLY)
 configure_file(vncsession-start.in vncsession-start @ONLY)
diff --git a/unix/vncserver/vncsession.c b/unix/vncserver/vncsession.c
index 3573e5e9b..f6d2fd59e 100644
--- a/unix/vncserver/vncsession.c
+++ b/unix/vncserver/vncsession.c
@@ -37,6 +37,11 @@
 #include <sys/types.h>
 #include <sys/wait.h>

+#ifdef HAVE_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/restorecon.h>
+#endif
+
 extern char **environ;

 // PAM service name
@@ -360,6 +365,17 @@ redir_stdio(const char *homedir, const char *display)
             syslog(LOG_CRIT, "Failure creating \"%s\": %s", logfile, strerror(errno));
             _exit(EX_OSERR);
         }
+
+#ifdef HAVE_SELINUX
+        int result;
+        if (selinux_file_context_verify(logfile, 0) == 0) {
+            result = selinux_restorecon(logfile, SELINUX_RESTORECON_RECURSE);
+
+            if (result < 0) {
+                syslog(LOG_WARNING, "Failure restoring SELinux context for \"%s\": %s", logfile, strerror(errno));
+            }
+        }
+#endif
     }

     hostlen = sysconf(_SC_HOST_NAME_MAX);