getexeccon(3)

NAME
getexeccon, setexeccon - get or set the SELinux security context used for executing a new process

rpm_execcon - run a helper for rpm in an appropriate security context

SYNOPSIS
#include <selinux/selinux.h>

int getexeccon(char **context);

int getexeccon_raw(char **context);

int setexeccon(const char *context);

int setexeccon_raw(const char *context);

int setexecfilecon(const char *filename, const char *fallback_type);

int rpm_execcon(unsigned int verified, const char *filename, char *const argv[], char *const envp[]);

DESCRIPTION
getexeccon() retrieves the context used for executing a new process. This returned context should be freed with freecon(3) if non-NULL. getexeccon() sets *context to NULL if no exec context has been explicitly set by the program (i.e., using the default policy behavior).

setexeccon() sets the context used for the next execve(2) call. NULL can be passed to setexeccon() to reset to the default policy behavior. The exec context is automatically reset after the next execve(2), so a program doesn't need to explicitly sanitize it upon startup.

setexeccon() can be applied prior to library functions that internally perform an execve(2), e.g., execl*(3), execv*(3), popen(3), in order to set an exec context for that operation.

getexeccon_raw() and setexeccon_raw() behave identically to their non-raw counterparts but do not perform context translation.

Note: Signal handlers that perform an execve(2) must take care to save, reset, and restore the exec context to avoid unexpected behavior.

setexecfilecon() sets the context used for the next execve(2) call, based on the policy for the filename, and falling back to a new context with a fallback_type in case there is no transition.

rpm_execcon() is deprecated; please use setexecfilecon() in conjunction with execve(2) in all new code. This function runs a helper for rpm in an appropriate security context. The verified parameter should contain the return code from the signature verification (0 == ok, 1 == notfound, 2 == verifyfail, 3 == nottrusted, 4 == nokey), although this information is not yet used by the function. The function determines the proper security context for the helper based on policy, sets the exec context accordingly, and then executes the specified filename with the provided argument and environment arrays.

RETURN VALUE
On failure, -1 is returned and errno is set appropriately.

On success getexeccon(), setexeccon() and setexecfilecon() return 0. rpm_execcon() only returns upon errors, as it calls execve(2).

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