[refpolicy] [PATCH 1/1] tcpdump chroots into /var/lib/tcpdump

[refpolicy] [PATCH 1/1] tcpdump chroots into /var/lib/tcpdump

[Sven Vermeulen]

When invoking tcpdump, the application creates a netlink_socket and then chroots
into /var/lib/tcpdump.

Without the right to create a netlink_socket:
tcpdump: Can't open netlink socket 13:Permission denied

Without the right on dac_read_search and sys_chroot:
tcpdump: Couldn't chroot/chdir to '/var/lib/tcpdump': Permission denied

See also https://bugs.gentoo.org/show_bug.cgi?id=443624

Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>
---
 policy/modules/admin/netutils.te |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/policy/modules/admin/netutils.te b/policy/modules/admin/netutils.te
index b6c221d..606948a 100644
--- a/policy/modules/admin/netutils.te
+++ b/policy/modules/admin/netutils.te
@@ -33,10 +33,11 @@ init_system_domain(traceroute_t, traceroute_exec_t)
 #
 
 # Perform network administration operations and have raw access to the network.
-allow netutils_t self:capability { net_admin net_raw setuid setgid };
-dontaudit netutils_t self:capability sys_tty_config;
+allow netutils_t self:capability { dac_read_search net_admin net_raw setuid setgid sys_chroot };
+dontaudit netutils_t self:capability { dac_override sys_tty_config };
 allow netutils_t self:process { setcap signal_perms };
 allow netutils_t self:netlink_route_socket create_netlink_socket_perms;
+allow netutils_t self:netlink_socket create_socket_perms;
 allow netutils_t self:packet_socket create_socket_perms;
 allow netutils_t self:udp_socket create_socket_perms;
 allow netutils_t self:tcp_socket create_stream_socket_perms;
@@ -47,6 +48,7 @@ manage_files_pattern(netutils_t, netutils_tmp_t, netutils_tmp_t)
 files_tmp_filetrans(netutils_t, netutils_tmp_t, { file dir })
 
 kernel_search_proc(netutils_t)
+kernel_read_network_state(netutils_t)
 kernel_read_all_sysctls(netutils_t)
 
 corenet_all_recvfrom_unlabeled(netutils_t)
-- 
1.7.8.6

[refpolicy] [PATCH 1/1] tcpdump chroots into /var/lib/tcpdump

[Christopher J. PeBenito]

On 11/18/12 02:41, Sven Vermeulen wrote:
> When invoking tcpdump, the application creates a netlink_socket and then chroots
> into /var/lib/tcpdump.
> 
> Without the right to create a netlink_socket:
> tcpdump: Can't open netlink socket 13:Permission denied
> 
> Without the right on dac_read_search and sys_chroot:
> tcpdump: Couldn't chroot/chdir to '/var/lib/tcpdump': Permission denied
> 
> See also https://bugs.gentoo.org/show_bug.cgi?id=443624

Merged.

> Signed-off-by: Sven Vermeulen <sven.vermeulen@siphos.be>
> ---
>  policy/modules/admin/netutils.te |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/policy/modules/admin/netutils.te b/policy/modules/admin/netutils.te
> index b6c221d..606948a 100644
> --- a/policy/modules/admin/netutils.te
> +++ b/policy/modules/admin/netutils.te
> @@ -33,10 +33,11 @@ init_system_domain(traceroute_t, traceroute_exec_t)
>  #
>  
>  # Perform network administration operations and have raw access to the network.
> -allow netutils_t self:capability { net_admin net_raw setuid setgid };
> -dontaudit netutils_t self:capability sys_tty_config;
> +allow netutils_t self:capability { dac_read_search net_admin net_raw setuid setgid sys_chroot };
> +dontaudit netutils_t self:capability { dac_override sys_tty_config };
>  allow netutils_t self:process { setcap signal_perms };
>  allow netutils_t self:netlink_route_socket create_netlink_socket_perms;
> +allow netutils_t self:netlink_socket create_socket_perms;
>  allow netutils_t self:packet_socket create_socket_perms;
>  allow netutils_t self:udp_socket create_socket_perms;
>  allow netutils_t self:tcp_socket create_stream_socket_perms;
> @@ -47,6 +48,7 @@ manage_files_pattern(netutils_t, netutils_tmp_t, netutils_tmp_t)
>  files_tmp_filetrans(netutils_t, netutils_tmp_t, { file dir })
>  
>  kernel_search_proc(netutils_t)
> +kernel_read_network_state(netutils_t)
>  kernel_read_all_sysctls(netutils_t)
>  
>  corenet_all_recvfrom_unlabeled(netutils_t)
> 


-- 
Chris PeBenito
Tresys Technology, LLC
www.tresys.com | oss.tresys.com