stunnel_selinux − Security Enhanced Linux Policy for the stunnel processes |
Security-Enhanced Linux secures the stunnel processes via flexible mandatory access control. The stunnel processes execute with the stunnel_t SELinux type. You can check if you have these processes running by executing the ps command with the −Z qualifier. For example: ps -eZ | grep stunnel_t |
The stunnel_t SELinux type can be entered via the stunnel_exec_t file type. The default entrypoint paths for the stunnel_t domain are the following: /usr/bin/stunnel, /usr/sbin/stunnel |
SELinux defines process types (domains) for each process running on the system You can see the context of a process using the −Z option to ps Policy governs the access confined processes have to files. SELinux stunnel policy is very flexible allowing users to setup their stunnel processes in as secure a method as possible. The following process types are defined for stunnel: stunnel_t Note: semanage permissive -a stunnel_t can be used to make the process type stunnel_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. |
SELinux policy is customizable based on least access required. stunnel policy is extremely flexible and has several booleans that allow you to manipulate the policy and run stunnel with the tightest access possible. If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default. setsebool -P authlogin_nsswitch_use_ldap 1 If you want to allow all daemons to write corefiles to /, you must turn on the daemons_dump_core boolean. Disabled by default. setsebool -P daemons_dump_core 1 If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Enabled by default. setsebool -P daemons_enable_cluster_mode 1 If you want to allow all daemons to use tcp wrappers, you must turn on the daemons_use_tcp_wrapper boolean. Disabled by default. setsebool -P daemons_use_tcp_wrapper 1 If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default. setsebool -P daemons_use_tty 1 If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default. setsebool -P deny_ptrace 1 If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default. setsebool -P domain_fd_use 1 If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default. setsebool -P domain_kernel_load_modules 1 If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default. setsebool -P fips_mode 1 If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default. setsebool -P global_ssp 1 If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default. setsebool -P kerberos_enabled 1 If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default. setsebool -P nis_enabled 1 If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Disabled by default. setsebool -P nscd_use_shm 1 |
SELinux defines port types to represent TCP and UDP ports. You can see the types associated with a port by using the following command: semanage port -l Policy governs the access confined processes have to these ports. SELinux stunnel policy is very flexible allowing users to setup their stunnel processes in as secure a method as possible. The following port types are defined for stunnel: |
stunnel_port_t |