selinux: Allow read access to /proc/sys/net/ipv4/ip_local_port_range

Since commit eedc81b6ef55 ("fwd, conf: Probe host's ephemeral ports"),
we might need to read from /proc/sys/net/ipv4/ip_local_port_range in
both passt and pasta.

While pasta was already allowed to open and write /proc/sys/net
entries, read access was missing in SELinux's type enforcement: add
that.

In passt, instead, this is the first time we need to access an entry
there: add everything we need.

Fixes: eedc81b6ef55 ("fwd, conf: Probe host's ephemeral ports")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

2 files changed, 4 insertions, 1 deletions

diff --git a/contrib/selinux/passt.te b/contrib/selinux/passt.te
index bbb0917..80bf780 100644
--- a/contrib/selinux/passt.te
+++ b/contrib/selinux/passt.te
@@ -50,6 +50,7 @@ require {
 	type passwd_file_t;
 
 	class netlink_route_socket { bind create nlmsg_read };
+	type sysctl_net_t;
 
 	class capability { sys_tty_config setuid setgid };
 	class cap_userns { setpcap sys_admin sys_ptrace };
@@ -104,6 +105,8 @@ allow passt_t net_conf_t:lnk_file read;
 allow passt_t tmp_t:sock_file { create unlink write };
 allow passt_t self:netlink_route_socket { bind create nlmsg_read read write setopt };
 kernel_search_network_sysctl(passt_t)
+allow passt_t sysctl_net_t:dir search;
+allow passt_t sysctl_net_t:file { open read };
 
 corenet_tcp_bind_all_nodes(passt_t)
 corenet_udp_bind_all_nodes(passt_t)
diff --git a/contrib/selinux/pasta.te b/contrib/selinux/pasta.te
index 4e36c3f..310383c 100644
--- a/contrib/selinux/pasta.te
+++ b/contrib/selinux/pasta.te
@@ -196,7 +196,7 @@ allow pasta_t ifconfig_var_run_t:dir { read search watch };
 allow pasta_t self:tun_socket create;
 allow pasta_t tun_tap_device_t:chr_file { ioctl open read write };
 allow pasta_t sysctl_net_t:dir search;
-allow pasta_t sysctl_net_t:file { open write };
+allow pasta_t sysctl_net_t:file { open read write };
 allow pasta_t kernel_t:system module_request;
 
 allow pasta_t nsfs_t:file read;