Newbie Q - gitweb policy

Sat Mar 21 09:55:55 UTC 2009

On Sat, 2009-03-21 at 02:26 +0000, Aaron Gray wrote:
> > On Fri, 2009-03-20 at 20:14 +0000, Aaron Gray wrote:
> >> I am trying to audit2allow on F10 to allow a cgi-bin perl script to run 
> >> on
> >> Apache. Runs fine in permissive mode not in enforcing.
> >>
> 
> I had to use 'setenforce 0', remove the grep, and then whittle down the code 
> a bit.
> 
> mkdir gitweb-policy;
> cd gitweb-policy;
> echo "policy_module(gitweb, 0.0.1)" > gitweb.te
> echo "apache_content_template(gitweb)" >> gitweb.te
> echo "/var/www/git/gitweb.cgi --  
> gen_context(system_u:object_r:httpd_gitweb_script_exec_t, s0)" >gitweb.fc
> 
> make -f /usr/share/selinux/devel/Makefile
> semodule -i gitweb.pp
> restorecon -R -v /var/www/git/gitweb.cgi
> 
> setenforce 0;
> 
> Do the http access !
> 
> 
> setenforce 1;
> 
> ausearch -m avc -ts today | audit2allow -R >> gitweb.te;
> 
> make -f /usr/share/selinux/devel/Makefile;
> 
> semodule -i gitweb.pp
> 
> 
> Whittle the code down a bit to :-
> gitweb.te
> policy_module(gitweb, 0.0.1)
> apache_content_template(gitweb)
> 
> require {
>         type httpd_sys_script_t;
> }
> 
> #============= httpd_sys_script_t ==============
> files_list_default(httpd_sys_script_t)
> files_read_default_files(httpd_sys_script_t)

Looks like something went wrong here.
for starters something is running in the httpd_sys_script_t domain and
not httpd_gitweb_script_t.

Second youre giving httpd_sys_script_t access to read files with type
default_t (not recommended)

http://docs.fedoraproject.org/selinux-user-guide/f10/en-US/

Heres my git policy:
policy_module(git_daemon, 0.0.1) 

########################################
#
# Git daemon declarations
#

attribute git_daemon_user_content_type;
attribute git_daemon_system_content_type;

type git_daemon_t;
type git_daemon_exec_t;
inetd_service_domain(git_daemon_t, git_daemon_exec_t)
role system_r types git_daemon_t;

application_executable_file(git_daemon_exec_t)

type git_daemon_system_content_t, git_daemon_system_content_type;
typeattribute git_daemon_system_content_t
git_daemon_system_content_type;
files_type(git_daemon_system_content_t)

## <desc>
## <p>
## Allow Git daemon to read home directories.
## </p>
## </desc>
gen_tunable(git_daemon_enable_homedirs, false)

## <desc>
## <p>
## Allow Git daemon to access nfs file systems.
## </p>
## </desc>
gen_tunable(git_daemon_use_nfs, false)

## <desc>
## <p>
## Allow Git daemon to access cifs file systems.
## </p>
## </desc>
gen_tunable(git_daemon_use_cifs, false)

########################################
#
# Git daemon policy
#

allow git_daemon_t self:fifo_file rw_fifo_file_perms;
allow git_daemon_t self:netlink_route_socket { write getattr read bind
create nlmsg_read };
allow git_daemon_t self:udp_socket { write read create connect
getattr };
allow git_daemon_t self:unix_dgram_socket { write create connect };

list_dirs_pattern(git_daemon_t, git_daemon_system_content_type,
git_daemon_system_content_type)
read_files_pattern(git_daemon_t, git_daemon_system_content_type,
git_daemon_system_content_type)

corecmd_exec_bin(git_daemon_t)

corenet_all_recvfrom_unlabeled(git_daemon_t)
corenet_all_recvfrom_netlabel(git_daemon_t)

files_read_etc_files(git_daemon_t)
files_search_usr(git_daemon_t)

fs_search_auto_mountpoints(git_daemon_t)

kernel_read_system_state(git_daemon_t)

libs_use_ld_so(git_daemon_t)
libs_use_shared_libs(git_daemon_t)

logging_send_syslog_msg(git_daemon_t)

miscfiles_read_localization(git_daemon_t)

miscfiles_read_public_files(git_daemon_t)

sysnet_read_config(git_daemon_t)

optional_policy(`
	apache_content_template(gitweb)
	apache_search_sys_content(httpd_gitweb_script_t)
	files_getattr_tmp_dirs(httpd_gitweb_script_t)
	git_daemon_read_system_content(httpd_gitweb_script_t)
')

optional_policy(`
	nscd_read_pid(git_daemon_t)
')

tunable_policy(`git_daemon_enable_homedirs && use_nfs_home_dirs', `
	fs_list_nfs(git_daemon_t)
	fs_read_nfs_files(git_daemon_t)
')

tunable_policy(`git_daemon_use_nfs', `
	fs_list_nfs(git_daemon_t)
	fs_read_nfs_files(git_daemon_t)
')

tunable_policy(`git_daemon_enable_homedirs && use_samba_home_dirs', `
	fs_list_cifs(git_daemon_t)
	fs_read_cifs_files(git_daemon_t)
')

tunable_policy(`git_daemon_use_cifs', `
	fs_list_cifs(git_daemon_t)
	fs_read_cifs_files(git_daemon_t)
')

tunable_policy(`git_daemon_enable_homedirs', `
	list_dirs_pattern(git_daemon_t, git_daemon_user_content_type,
git_daemon_user_content_type)
	read_files_pattern(git_daemon_t, git_daemon_user_content_type,
git_daemon_user_content_type)
	userdom_search_all_users_home_dirs(git_daemon_t)
')

#EOF

## <summary>SELinux policy for Git daemon.</summary>
## <desc>
##	<p>
##	Git daemon is a really simple server for Git
##	repositories.
##	</p>
## </desc>

#######################################
## <summary>
##  The per role template for the Git daemon module.
## </summary>
## <desc>
## 	<p>
## 	This template creates derived domains which are used
## 	for Git daemon.
## 	</p>
## 	<p>
## 	This template is invoked automatically for each user, and
## 	generally does not need to be invoked directly
## 	by policy writers.
## 	</p>
## </desc>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="user_domain">
## 	<summary>
## 	The type of the user domain.
## 	</summary>
## 	</param>
## 	<param name="user_role">
## 	<summary>
## 	The role associated with the user domain.
## 	</summary>
## </param>
#
template(`git_daemon_per_role_template', `
	gen_require(`
		type git_daemon_exec_t;
		attribute git_daemon_user_content_type;
	')

	########################################
	#
	#  Git daemon public declarations.
	#

	type $1_git_daemon_t;
	application_domain($1_git_daemon_t, git_daemon_exec_t)
	role $3 types $1_git_daemon_t;

	type $1_git_daemon_home_t, git_daemon_user_content_type;
	userdom_user_home_content($1, $1_git_daemon_home_t)

	typeattribute $1_git_daemon_home_t git_daemon_user_content_type;

	########################################
	#
	# Git daemon public policy.
	#

	allow $1_git_daemon_t self:fifo_file rw_fifo_file_perms;
	allow $1_git_daemon_t self:netlink_route_socket { write getattr read
bind create nlmsg_read };
	allow $1_git_daemon_t self:tcp_socket { bind read write accept create
setopt listen };
	allow $1_git_daemon_t self:udp_socket { create connect write read
getattr };	

	allow $1_git_daemon_t $2:process sigchld;

	allow $2 $1_git_daemon_t:process { ptrace signal_perms };

	git_daemon_read_user_content($1, $1_git_daemon_t)

	manage_dirs_pattern($2, git_daemon_user_content_type,
git_daemon_user_content_type)
	manage_files_pattern($2, git_daemon_user_content_type,
git_daemon_user_content_type)
	exec_files_pattern($2, git_daemon_user_content_type,
git_daemon_user_content_type)
	userdom_search_user_home_dirs($1, $1_git_daemon_t)
	userdom_user_home_dir_filetrans($1, $1_git_daemon_t,
$1_git_daemon_home_t, { dir file })

	relabel_dirs_pattern($2, git_daemon_user_content_type,
git_daemon_user_content_type)
	relabel_files_pattern($2, git_daemon_user_content_type,
git_daemon_user_content_type)

	domain_auto_trans($2, git_daemon_exec_t, $1_git_daemon_t)

	ps_process_pattern($2, $1_git_daemon_t)

	corecmd_exec_bin($1_git_daemon_t)

	corenet_all_recvfrom_unlabeled($1_git_daemon_t)
	corenet_all_recvfrom_netlabel($1_git_daemon_t)

 	corenet_tcp_sendrecv_all_if($1_git_daemon_t)
	corenet_tcp_sendrecv_all_nodes($1_git_daemon_t)

 	corenet_tcp_bind_all_nodes($1_git_daemon_t)

	corenet_tcp_bind_git_daemon_port($1_git_daemon_t)

	files_read_etc_files($1_git_daemon_t)

	files_search_home($1_git_daemon_t)
	files_search_usr($1_git_daemon_t)

	fs_search_auto_mountpoints($1_git_daemon_t)

	kernel_read_system_state($1_git_daemon_t)

	libs_use_ld_so($1_git_daemon_t)
	libs_use_shared_libs($1_git_daemon_t)

	logging_send_syslog_msg($1_git_daemon_t)

	miscfiles_read_localization($1_git_daemon_t)

	sysnet_read_config($1_git_daemon_t)

	userdom_use_user_terminals($1, $1_git_daemon_t)

	tunable_policy(`use_nfs_home_dirs', `
		fs_list_nfs($1_git_daemon_t)
 		fs_read_nfs_files($1_git_daemon_t)
	')

	tunable_policy(`use_samba_home_dirs', `
		fs_list_cifs($1_git_daemon_t)
		fs_read_cifs_files($1_git_daemon_t)
	')

	optional_policy(`
		nscd_read_pid($1_git_daemon_t)
	')

	optional_policy(`
		nis_use_ypbind($1_git_daemon_t)
	')
')

########################################
## <summary>
##	Allow the specified domain to read
##	Git daemon system content.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_read_system_content', `
	gen_require(`
		attribute git_daemon_system_content_type;
	')

	files_search_var($1)
	list_dirs_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
	read_files_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
')

########################################
## <summary>
##	Allow the specified domain to manage
##	Git daemon system content.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_manage_system_content', `
	gen_require(`
		attribute git_daemon_system_content_type;
	')

	files_search_var($1)
	manage_dirs_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
	manage_files_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
')

########################################
## <summary>
##	Allow the specified domain to execute
##	Git daemon system content files.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_execute_system_content_files', `
	gen_require(`
		attribute git_daemon_system_content_type;
	')

	files_search_var($1)
	exec_files_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
')

########################################
## <summary>
##	Allow the specified domain to read
##	Git daemon personal repositories.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`git_daemon_read_user_content', `
	gen_require(`
		attribute git_daemon_user_content_type;
	')

	allow $2 git_daemon_user_content_type:dir list_dir_perms;
	allow $2 git_daemon_user_content_type:file read_file_perms;
	userdom_search_user_home_dirs($1, $2)
')

########################################
## <summary>
##	Allow the specified domain to manage
##	Git daemon personal repositories.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`git_daemon_manage_user_content', `
	gen_require(`
		attribute git_daemon_user_content_type;
	')

	allow $2 git_daemon_user_content_type:dir manage_dir_perms;
	allow $2 git_daemon_user_content_type:file manage_file_perms;
	userdom_user_home_dir_filetrans($1, $2, git_daemon_user_content_type,
{ dir file })
	userdom_search_user_home_dirs($1, $2)
')

########################################
## <summary>
##	Allow the specified domain to relabel
##	Git daemon personal repositories.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
#
interface(`git_daemon_relabel_user_content', `
	gen_require(`
		attribute git_daemon_user_content_type;
	')

	allow $2 git_daemon_user_content_type:dir relabel_dir_perms;
	allow $2 git_daemon_user_content_type:file relabel_file_perms;
	userdom_search_user_home_dirs($1, $2)
')

########################################
## <summary>
##	Allow the specified domain to manage
##	all Git daemon content.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_manage_all_content', `
	git_daemon_manage_user_content($1, $2)
	git_daemon_manage_system_content($2)
')

########################################
## <summary>
##	Allow the specified domain to read
##	all Git daemon content.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_read_all_content', `
	git_daemon_read_user_content($1, $2)
	git_daemon_read_system_content($2)
')

########################################
## <summary>
##	Allow the specified domain to relabel
##	all Git daemon content.
## </summary>
## <param name="userdomain_prefix">
## 	<summary>
## 	The prefix of the user domain (e.g., user
## 	is the prefix for user_t).
## 	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_relabel_all_content', `
	git_daemon_relabel_user_content($1, $2)
	git_daemon_relabel_system_content($2)
')

########################################
## <summary>
##	Allow the specified domain to list
##	Git daemon system content directories.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_list_system_content_dirs', `
	gen_require(`
		attribute git_daemon_system_content_type;
	')

	files_search_var($1)
	list_dirs_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
')

########################################
## <summary>
##	Allow the specified domain to search
##	Git daemon system content directories.
## </summary>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_search_system_content_dirs', `
	gen_require(`
		attribute git_daemon_system_content_type;
	')

	files_search_var($1)
	search_dirs_pattern($1, git_daemon_system_content_type,
git_daemon_system_content_type)
')

#######################################
## <summary>
##	The template for creating a Git user domain.
## </summary>
## <desc>
##	<p>
##	This template creates a user domain, types, and
##	rules for the user's pty.
##	</p>
## </desc>
## <param name="userdomain_prefix">
##	<summary>
##	The prefix of the user domain (e.g., user
##	is the prefix for user_t).
##	</summary>
## </param>
#
template(`git_daemon_git_user_template',`
	gen_require(`
		attribute unpriv_userdomain, userdomain;
		class context contains;
	')

	##############################
	#
	# Git user public declarations.
	#

	attribute $1_file_type;
	attribute $1_usertype;

	type $1_t, userdomain, $1_usertype;
	domain_type($1_t)

	corecmd_shell_entry_type($1_t)
	corecmd_bin_entry_type($1_t)
	domain_user_exemption_target($1_t)

	role $1_r types $1_t;
	allow system_r $1_r;

	typeattribute $1_t unpriv_userdomain;
	domain_interactive_fd($1_t)

	##############################
	#
	# Git user public policy.
	#

	allow $1_usertype self:context contains;

	allow $1_usertype $1_usertype:fifo_file rw_fifo_file_perms;

	corecmd_exec_bin($1_usertype)

	kernel_read_system_state($1_usertype)

	files_read_etc_files($1_usertype)

	files_search_home($1_usertype)

	git_daemon_manage_system_content($1_usertype)
	git_daemon_execute_system_content_files($1_usertype)

	libs_use_ld_so($1_usertype)
	libs_use_shared_libs($1_usertype)

	miscfiles_read_localization($1_usertype)

	ssh_rw_stream_sockets($1_usertype)

	optional_policy(` 
		nscd_read_pid($1_usertype)
	')
')

########################################
## <summary>
##	All of the rules required to administrate an 
##	Git daemon environment
## </summary>
## <param name="userdomain_prefix">
##	<summary>
##	Prefix of the domain. Example, user would be
##	the prefix for the user_t domain.
##	</summary>
## </param>
## <param name="domain">
##	<summary>
##	Domain allowed access.
##	</summary>
## </param>
## <param name="role">
##	<summary>
##	The role to be allowed to manage the Git daemon domain.
##	</summary>
## </param>
## <rolecap/>
#
interface(`git_daemon_admin', `

	gen_require(`
		type git_daemon_t, git_daemon_exec_t, httpd_gitweb_script_exec_t;
	')

	allow $1 git_daemon_t:process { getattr ptrace signal_perms };

	git_daemon_manage_all_content($1, $2)
	git_daemon_relabel_all_content($1, $2)

	miscfiles_manage_public_files($1)

	kernel_search_proc($1)
	allow $1 git_daemon_t:dir list_dir_perms;
	read_files_pattern($1, git_daemon_t, git_daemon_t)
	read_lnk_files_pattern($1, git_daemon_t, git_daemon_t)

	manage_files_pattern($1, httpd_gitweb_script_exec_t,
httpd_gitweb_script_exec_t)
	manage_files_pattern($1, git_daemon_exec_t, git_daemon_exec_t)

	seutil_domtrans_setfiles($1)
')

#EOF

########################################
#
# Git daemon contexts
#

HOME_DIR/public_git(/.*)?
gen_context(system_u:object_r:ROLE_git_daemon_home_t, s0)

HOME_DIR/\.gitconfig   --
gen_context(system_u:object_r:ROLE_git_daemon_home_t, s0)

/srv/git(/.*)?
gen_context(system_u:object_r:git_daemon_system_content_t, s0)

/usr/bin/git-daemon            --
gen_context(system_u:object_r:git_daemon_exec_t, s0)

/var/www/git/gitweb\.cgi       --
gen_context(system_u:object_r:httpd_gitweb_script_exec_t, s0)

#EOF

But it wont work unless its modified or integrated properly. Also it
might need some polishing.

> gitweb.fc
> /var/www/git/gitweb.cgi --  
> gen_context(system_u:object_r:httpd_gitweb_script_exec_t, s0)
> 