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
#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(const char *context);
int setcon_raw(const char *context);
-
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, which
must be free'd with freecon().
-
getpeercon()
- retrieves the context of the peer socket, which must be
free'd with freecon().
-
freecon()
- frees the memory allocated for a security context.
If con is NULL, no operation is performed.
-
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.
- *_raw()
-
getcon_raw(), getprevcon_raw(),
getpidcon_raw(), getpeercon_raw() and setcon_raw()
behave identically to their non-raw counterparts but do not perform
context translation.
On error -1 is returned with errno set. On success 0 is returned.
The retrieval functions might return success and set
*context to NULL if
and only if SELinux is not enabled.
selinux(8),
setexeccon(3)