.TH "security_compute_av" "3" "1 January 2004" "russell@coker.com.au" "SELinux API documentation"
.SH "NAME"
security_compute_av, security_compute_av_flags, security_compute_create, security_compute_relabel,
security_compute_member, security_compute_user, security_get_initial_context \- query
the SELinux policy database in the kernel.

.SH "SYNOPSIS"
.B #include <selinux/selinux.h>

.B #include <selinux/flask.h>
.sp
.BI "int security_compute_av(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", access_vector_t "requested ", struct av_decision *" avd );
.sp
.BI "int security_compute_av_flags(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", access_vector_t "requested ", struct av_decision *" avd );
.sp
.BI "int security_compute_create(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
.sp
.BI "int security_compute_relabel(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
.sp
.BI "int security_compute_member(security_context_t "scon ", security_context_t "tcon ", security_class_t "tclass ", security_context_t *" newcon );
.sp
.BI "int security_compute_user(security_context_t "scon ", const char *" username ", security_context_t **" con );
.sp
.BI "int security_get_initial_context(const char *" name ", security_context_t
"con );
.sp
.BI "int selinux_check_access(const security_context_t " scon, " const security_context_t " tcon, " const char *" class, " const char *" perm, "void *" auditdata);
.sp
.BI "int selinux_check_passwd_access(access_vector_t " requested );
.sp
.BI "int checkPasswdAccess(access_vector_t " requested );

.SH "DESCRIPTION"
.B security_compute_av
queries whether the policy permits the source context
.B scon
to access the target context
.B tcon
via class
.B tclass
with the
.B requested
access vector.  The decision is returned in
.BR avd .

.B security_compute_av_flags
is identical to
.B security_compute_av
but additionally sets the
.B flags
field of
.BR avd .
Currently one flag is supported:
.BR SELINUX_AVD_FLAGS_PERMISSIVE ,
which indicates the decision is computed on a permissive domain.

.B security_compute_create
is used to compute a context to use for labeling a new object in a particular
class based on a SID pair.

.B security_compute_relabel
is used to compute the new context to use when relabeling an object, it is used
in the pam_selinux.so source and the newrole source to determine the correct
label for the tty at login time, but can be used for other things.

.B security_compute_member
is used to compute the context to use when labeling a polyinstantiated object
instance.

.B security_compute_user
is used to determine the set of user contexts that can be reached from a
source context. It is mainly used by
.B get_ordered_context_list.

.B security_get_initial_context
is used to get the context of a kernel initial security identifier specified by 
.I name

.B selinux_check_access
is used to check if the source context has the access permission for the specified class on the target context.

.B selinux_check_passwd_access
is used to check for a permission in the
.I passwd
class.
.B selinux_check_passwd_access
uses getprevcon() for the source and target security contexts.

.B checkPasswdAccess
is a deprecated alias of the
.B selinux_check_passwd_access
function.

.SH "RETURN VALUE"
Returns zero on success or \-1 on error.

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