libselinux/man/man3/getexeccon.3

.TH "getexeccon" "3" "1 January 2004" "russell@coker.com.au" "SELinux API documentation"
.SH "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

.SH "SYNOPSIS"
.B #include <selinux/selinux.h>
.sp
.BI "int getexeccon(security_context_t *" context );

.BI "int setexeccon(security_context_t "context );

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

.SH "DESCRIPTION"
.B 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).

.B 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.


.B 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.


.SH "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).

.SH "SEE ALSO"
.BR selinux "(8), " freecon "(3), " getcon "(3)"