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(security_context_t *context);

int setexeccon(security_context_t context);

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 if non-NULL. getexeccon sets *con 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 call. NULL can be passed to setexeccon to reset to the default policy behavior. The exec context is automatically reset after the next execve, 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, e.g. execl*, execv*, popen, in order to set an exec context for that operation.

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

rpm_execcon 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 error -1 is returned.

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

SEE ALSO¶

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