[PATCH] selinux: Access to netns for podman-build, read access for netns in general

[Stefano Brivio <sbrivio@redhat.com>]

A few additional rules are needed when pasta is started by Podman in
particular cases:

- with podman-build or Buildah, pasta needs to access the target
  namespace reference using a procfs namespace link entry, instead of
  the usual directory under /run or /var/run. For that, we have a
  rule enabling access to container_t:lnk_file.

  On some systems, though, the class is 'dir' instead of 'lnk_file'.
  I don't have a concrete way to reproduce this or a full explanation,
  but in any case, an additional rule for that is obviously harmless:
  allow pasta_t to open, read, and search a container_t:dir

- with custom networks, pasta needs to write PID files to a location
  indicated by Podman. If the PID file already exists, the existing
  permissions aren't sufficient: we also need a 'read' rule. Add that,
  for 'dir' and 'file' objects labeled as either container_var_run_t
  or ifconfig_var_run_t (this depends on the installed Podman and
  container-selinux versions)

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
 contrib/selinux/pasta.te | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/contrib/selinux/pasta.te b/contrib/selinux/pasta.te
index ff74dd7..9394f97 100644
--- a/contrib/selinux/pasta.te
+++ b/contrib/selinux/pasta.te
@@ -175,6 +175,7 @@ allow pasta_t container_runtime_t:fifo_file { getattr write };
 allow pasta_t container_runtime_t:file read;
 allow pasta_t container_runtime_t:lnk_file read;
 allow pasta_t container_t:lnk_file read;
+allow pasta_t container_t:dir { open read search };
 allow pasta_t pasta_port_t:tcp_socket { name_bind name_connect };
 allow pasta_t pasta_port_t:udp_socket { name_bind };
 allow pasta_t http_port_t:tcp_socket { name_bind name_connect };
@@ -249,10 +250,10 @@ type_transition container_runtime_t user_tmp_t : dir ifconfig_var_run_t "netns";
 type_transition container_runtime_t container_var_run_t : dir ifconfig_var_run_t "netns";
 type_transition container_runtime_t user_tmp_t : dir ifconfig_var_run_t "rootless-netns";
 type_transition container_runtime_t container_var_run_t : dir ifconfig_var_run_t "rootless-netns";
-allow pasta_t container_var_run_t:dir { add_name open rmdir write };
-allow pasta_t ifconfig_var_run_t:dir { add_name open rmdir write };
-allow pasta_t container_var_run_t:file { create open write };
-allow pasta_t ifconfig_var_run_t:file { create open write };
+allow pasta_t container_var_run_t:dir { add_name open read rmdir write };
+allow pasta_t ifconfig_var_run_t:dir { add_name open read rmdir write };
+allow pasta_t container_var_run_t:file { create open read write };
+allow pasta_t ifconfig_var_run_t:file { create open read write };
 allow pasta_t container_var_run_t:sock_file { getattr create open read write };
 allow pasta_t ifconfig_var_run_t:sock_file { getattr create open read write };
 allow systemd_user_runtimedir_t ifconfig_var_run_t:dir rmdir;
-- 
2.43.0