NAME

       getcon, getprevcon, getpidcon - get SELinux security context of a process

       freecon, freeconary - free memory associated with SELinux security contexts

       getpeercon - get security context of a peer socket

       setcon - set current security context of a process

SYNOPSIS

       #include <selinux/selinux.h>

       int getcon(char **context);

       int getcon_raw(char **context);

       int getprevcon(char **context);

       int getprevcon_raw(char **context);

       int getpidcon(pid_t pid, char **context);

       int getpidcon_raw(pid_t pid, char **context);

       int getpeercon(int fd, char **context);

       int getpeercon_raw(int fd, char **context);

       void freecon(char *con);

       void freeconary(char **con);

       int setcon(char *context);

       int setcon_raw(char *context);

DESCRIPTION

       getcon() retrieves the context of the current process, which must be free'd with freecon.

       getprevcon() same as getcon but gets the context before the last exec.

       getpidcon() returns the process context for the specified PID.

       getpeercon() retrieves context of peer socket, and set *context to refer to it, which must be free'd with
       freecon().

       freecon() frees the memory allocated for a security context.

       freeconary() frees the memory allocated for a context array.

       If con is NULL, no operation is performed.

       setcon() sets the current security context of the process to a new value.  Note that use of this function
       requires  that  the  entire application be trusted to maintain any desired separation between the old and
       new security contexts,  unlike  exec-based  transitions  performed  via  setexeccon(3).   When  possible,
       decompose your application and use setexeccon(3) and execve(3) instead.

       Since  access  to file descriptors is revalidated upon use by SELinux, the new context must be explicitly
       authorized in the policy to use the descriptors opened by the old context if that is desired.  Otherwise,
       attempts  by  the  process  to  use  any existing descriptors (including stdin, stdout, and stderr) after
       performing the setcon() will fail.

       A multi-threaded application can perform a setcon() prior to creating any child threads,  in  which  case
       all  of  the  child threads will inherit the new context.  However, prior to Linux 2.6.28, setcon() would
       fail if there are any other threads running in the same process since this would yield  an  inconsistency
       among  the  security  contexts of threads sharing the same memory space.  Since Linux 2.6.28, setcon() is
       permitted for threads within a multi-threaded process if the new security context is bounded by  the  old
       security  context,  where the bounded relation is defined through typebounds statements in the policy and
       guarantees that the new security context has a subset of the permissions of the old security context.

       If the process was being ptraced at the time  of  the  setcon()  operation,  ptrace  permission  will  be
       revalidated against the new context and the setcon() will fail if it is not allowed by policy.

       getcon_raw(),  getprevcon_raw(), getpidcon_raw(), getpeercon_raw() and setcon_raw() behave identically to
       their non-raw counterparts but do not perform context translation.

RETURN VALUE

       On error -1 is returned.  On success 0 is returned.

SEE ALSO

       selinux(8), setexeccon(3)