163 lines
6.1 KiB
Plaintext
163 lines
6.1 KiB
Plaintext
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##############################
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#
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# Assertions for the type enforcement (TE) configuration.
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#
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#
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# Authors: Stephen Smalley <sds@epoch.ncsc.mil> and Timothy Fraser
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#
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##################################
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#
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# Access vector assertions.
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#
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# An access vector assertion specifies permissions that should not be in
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# an access vector based on a source type, a target type, and a class.
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# If any of the specified permissions are in the corresponding access
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# vector, then the policy compiler will reject the policy configuration.
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# Currently, there is only one kind of access vector assertion, neverallow,
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# but support for the other kinds of vectors could be easily added. Access
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# vector assertions use the same syntax as access vector rules.
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#
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#
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# Verify that every type that can be entered by
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# a domain is also tagged as a domain.
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#
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neverallow domain ~domain:process { transition dyntransition };
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#
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# Verify that only the insmod_t and kernel_t domains
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# have the sys_module capability.
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#
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neverallow {domain -unrestricted -insmod_t -kernel_t ifdef(`howl.te', `-howl_t') } self:capability sys_module;
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#
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# Verify that executable types, the system dynamic loaders, and the
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# system shared libraries can only be modified by administrators.
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#
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neverallow {domain -kernel_t ifdef(`ldconfig.te', `-ldconfig_t') -admin} { exec_type ld_so_t shlib_t }:file { write append unlink rename };
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neverallow {domain ifdef(`ldconfig.te', `-ldconfig_t') -change_context -admin } { exec_type ld_so_t shlib_t }:file relabelto;
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#
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# Verify that only appropriate domains can access /etc/shadow
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neverallow { domain -auth -auth_write } shadow_t:file ~getattr;
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neverallow { domain -auth_write } shadow_t:file ~r_file_perms;
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#
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# Verify that only appropriate domains can write to /etc (IE mess with
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# /etc/passwd)
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neverallow {domain -auth_write -etc_writer } etc_t:dir ~rw_dir_perms;
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neverallow {domain -auth_write -etc_writer } etc_t:lnk_file ~r_file_perms;
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neverallow {domain -auth_write -etc_writer } etc_t:file ~{ execute_no_trans rx_file_perms };
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#
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# Verify that other system software can only be modified by administrators.
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#
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neverallow {domain -kernel_t ifdef(`ldconfig.te', `-ldconfig_t') -admin } { lib_t bin_t sbin_t }:dir { add_name remove_name rename };
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neverallow { domain -kernel_t -admin } { lib_t bin_t sbin_t }:file { write append unlink rename };
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#
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# Verify that only certain domains have access to the raw disk devices.
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#
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neverallow { domain -fs_domain } fixed_disk_device_t:devfile_class_set { read write append };
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#
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# Verify that only the X server and klogd have access to memory devices.
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#
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neverallow { domain -privmem } memory_device_t:devfile_class_set { read write append };
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#
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# Verify that only domains with the privlog attribute can actually syslog
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#
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neverallow { domain -unrestricted -privlog } devlog_t:sock_file { read write append };
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#
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# Verify that /proc/kmsg is only accessible to klogd.
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#
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ifdef(`klogd.te', `
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neverallow {domain -unrestricted -klogd_t } proc_kmsg_t:file ~stat_file_perms;
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', `
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ifdef(`syslogd.te', `
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neverallow {domain -unrestricted -syslogd_t } proc_kmsg_t:file ~stat_file_perms;
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')dnl end if syslogd
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')dnl end if klogd
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#
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# Verify that /proc/kcore is inaccessible.
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#
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neverallow { domain -unrestricted } proc_kcore_t:file ~stat_file_perms;
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#
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# Verify that sysctl variables are only changeable
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# by initrc and administrators.
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#
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neverallow { domain -initrc_t -admin -kernel_t -insmod_t } sysctl_t:file { write append };
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neverallow { domain -initrc_t -admin } sysctl_fs_t:file { write append };
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neverallow { domain -admin -sysctl_kernel_writer } sysctl_kernel_t:file { write append };
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neverallow { domain -initrc_t -admin -sysctl_net_writer } sysctl_net_t:file { write append };
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neverallow { domain -initrc_t -admin } sysctl_net_unix_t:file { write append };
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neverallow { domain -initrc_t -admin } sysctl_vm_t:file { write append };
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neverallow { domain -initrc_t -admin } sysctl_dev_t:file { write append };
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neverallow { domain -initrc_t -admin } sysctl_modprobe_t:file { write append };
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#
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# Verify that certain domains are limited to only being
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# entered by their entrypoint types and to only executing
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# the dynamic loader without a transition to another domain.
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#
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define(`assert_execute', `
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ifelse($#, 0, ,
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$#, 1,
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``neverallow $1_t ~$1_exec_t:file entrypoint; neverallow $1_t ~{ $1_exec_t ld_so_t }:file execute_no_trans;'',
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`assert_execute($1) assert_execute(shift($@))')')
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ifdef(`getty.te', `assert_execute(getty)')
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ifdef(`klogd.te', `assert_execute(klogd)')
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ifdef(`tcpd.te', `assert_execute(tcpd)')
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ifdef(`portmap.te', `assert_execute(portmap)')
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ifdef(`syslogd.te', `assert_execute(syslogd)')
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ifdef(`rpcd.te', `assert_execute(rpcd)')
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ifdef(`rlogind.te', `assert_execute(rlogind)')
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ifdef(`ypbind.te', `assert_execute(ypbind)')
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ifdef(`xfs.te', `assert_execute(xfs)')
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ifdef(`gpm.te', `assert_execute(gpm)')
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ifdef(`ifconfig.te', `assert_execute(ifconfig)')
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ifdef(`iptables.te', `assert_execute(iptables)')
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ifdef(`login.te', `
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neverallow { local_login_t remote_login_t } ~{ login_exec_t ifdef(`pam.te', `pam_exec_t') }:file entrypoint;
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neverallow { local_login_t remote_login_t } ~{ ld_so_t ifdef(`pam.te', `pam_exec_t') }:file execute_no_trans;
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')
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#
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# Verify that the passwd domain can only be entered by its
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# entrypoint type and can only execute the dynamic loader
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# and the ordinary passwd program without a transition to another domain.
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#
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ifdef(`passwd.te', `
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neverallow passwd_t ~passwd_exec_t:file entrypoint;
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neverallow sysadm_passwd_t ~admin_passwd_exec_t:file entrypoint;
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neverallow { passwd_t sysadm_passwd_t } ~{ bin_t sbin_t shell_exec_t ld_so_t }:file execute_no_trans;
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')
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#
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# Verify that only the admin domains and initrc_t have setenforce.
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#
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neverallow { domain -admin -initrc_t } security_t:security setenforce;
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#
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# Verify that only the kernel and load_policy_t have load_policy.
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#
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neverallow { domain -unrestricted -kernel_t -load_policy_t } security_t:security load_policy;
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#
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# for gross mistakes in policy
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neverallow * domain:dir ~r_dir_perms;
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neverallow * domain:file_class_set ~rw_file_perms;
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neverallow { domain unlabeled_t } file_type:process *;
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neverallow ~{ domain unlabeled_t } *:process *;
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