security_compute_av(3) SELinux API documentation security_compute_av(3)NAME
security_compute_av, security_compute_av_flags, security_compute_cre‐
ate, security_compute_create_name, security_compute_relabel, secu‐
rity_compute_member, security_compute_user, security_get_initial_con‐
text - query the SELinux policy database in the kernel.
SYNOPSIS
#include <selinux/selinux.h>
#include <selinux/flask.h>
int security_compute_av(security_context_t scon, security_context_t
tcon, security_class_t tclass, access_vector_t requested, struct
av_decision *avd);
int security_compute_av_flags(security_context_t scon, security_con‐
text_t tcon, security_class_t tclass, access_vector_t requested, struct
av_decision *avd);
int security_compute_create(security_context_t scon, security_context_t
tcon, security_class_t tclass, security_context_t *newcon);
int security_compute_create_name(security_context_t scon, security_con‐
text_t tcon, security_class_t tclass, const char *objname, secu‐
rity_context_t *newcon);
int security_compute_relabel(security_context_t scon, security_con‐
text_t tcon, security_class_t tclass, security_context_t *newcon);
int security_compute_member(security_context_t scon, security_context_t
tcon, security_class_t tclass, security_context_t *newcon);
int security_compute_user(security_context_t scon, const char *user‐
name, security_context_t **con);
int security_get_initial_context(const char *name, security_context_t
"con );
int selinux_check_access(const security_context_t scon, const secu‐
rity_context_t tcon, const char *class, const char *perm,void *audit‐
data);
int selinux_check_passwd_access(access_vector_t requested);
int checkPasswdAccess(access_vector_t requested);
DESCRIPTION
security_compute_av queries whether the policy permits the source con‐
text scon to access the target context tcon via class tclass with the
requested access vector. The decision is returned in avd.
security_compute_av_flags is identical to security_compute_av but addi‐
tionally sets the flags field of avd. Currently one flag is supported:
SELINUX_AVD_FLAGS_PERMISSIVE, which indicates the decision is computed
on a permissive domain.
security_compute_create is used to compute a context to use for label‐
ing a new object in a particular class based on a SID pair.
security_compute_create_name is identical to security_compute_create
but also takes name of the new object in creation as an argument. When
TYPE_TRANSITION rule on the given class and a SID pair has object name
extension, we shall be able to obtain a correct newcon according to the
security policy. Note that this interface is only supported on the
linux 2.6.40 or later. In the older kernel, the object name will be
simply ignored.
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.
security_compute_member is used to compute the context to use when
labeling a polyinstantiated object instance.
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
get_ordered_context_list.
security_get_initial_context is used to get the context of a kernel
initial security identifier specified by name
selinux_check_access is used to check if the source context has the
access permission for the specified class on the target context.
selinux_check_passwd_access is used to check for a permission in the
passwd class. selinux_check_passwd_access uses getprevcon() for the
source and target security contexts.
checkPasswdAccess is a deprecated alias of the
selinux_check_passwd_access function.
RETURN VALUE
Returns zero on success or -1 on error.
SEE ALSOselinux(8), getcon(3), getfilecon(3), get_ordered_context_list(3)russell@coker.com.au 1 January 2004 security_compute_av(3)
