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getcon(3)                  SELinux API documentation                 getcon(3)



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

       getpeercon - get security context of a peer socket.

       setcon - set current security context of a process.

SYNOPSIS
       #include <selinux/selinux.h>

       int getcon(security_context_t *context);

       int getprevcon(security_context_t *context);

       int getpidcon(pid_t pid, security_context_t *context);

       int getpeercon(int fd, security_context_t *context);

       int setcon(security_context_t 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.

       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
       applicaiton and use setexeccon() and execve() instead.

       Since  access to file descriptors is revalidated upon use by SELinux, the new context must be explicitly autho-
       rized 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 set-
       con() 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, setcon() will fail if there are any other threads
       running in the same process.

       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.


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


SEE ALSO
       selinux(8), freecon(3), setexeccon(3)



russellATcoker.au            1 January 2004                       getcon(3)