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avc_has_perm(3)		   SELinux API documentation	       avc_has_perm(3)

       avc_has_perm,  avc_has_perm_noaudit,  avc_audit,	 avc_entry_ref_init  -
       obtain and audit SELinux access decisions.

       #include <selinux/selinux.h>

       #include <selinux/avc.h>

       void avc_entry_ref_init(struct avc_entry_ref *aeref);

       int avc_has_perm(security_id_t ssid, security_id_t tsid,
			security_class_t tclass, access_vector_t requested,

			struct avc_entry_ref *aeref, void *auditdata);

       int avc_has_perm_noaudit(security_id_t ssid, security_id_t tsid,
			security_class_t tclass, access_vector_t requested,

			struct avc_entry_ref *aeref, struct av_decision *avd);

       void avc_audit(security_id_t ssid, security_id_t tsid,
		      security_class_t tclass, access_vector_t requested,

		      struct av_decision *avd, int result, void *auditdata);

       avc_entry_ref_init initializes an avc_entry_ref	structure;  see	 ENTRY
       REFERENCES below.  This function may be implemented as a macro.

       avc_has_perm  checks  whether the requested permissions are granted for
       subject SID ssid and target  SID	 tsid,	interpreting  the  permissions
       based  on  tclass  and updating aeref, if non-NULL, to refer to a cache
       entry with the resulting decision.  The granting or denial  of  permis‐
       sions  is audited in accordance with the policy.	 The auditdata parame‐
       ter is for supplemental auditing; see avc_audit below.

       avc_has_perm_noaudit behaves as avc_has_perm without producing an audit
       message.	  The  access decision is returned in avd and can be passed to
       avc_audit explicitly.

       avc_audit produces an audit message for the access query represented by
       ssid,  tsid, tclass, and requested, with a decision represented by avd.
       Pass the value returned by avc_has_perm_noaudit as result.  The	audit‐
       data  parameter	is passed to the user-supplied func_audit callback and
       can be used to add supplemental information to the audit	 message;  see

       Entry  references  can  be used to speed cache performance for repeated
       queries on the same subject and target.	The userspace AVC  will	 check
       the  aeref  argument, if supplied, before searching the cache on a per‐
       mission query.  After a query is performed, aeref will  be  updated  to
       reference  the  cache  entry for that query.  A subsequent query on the
       same subject and target will then have the  decision  at	 hand  without
       having to walk the cache.

       After  declaring	 an avc_entry_ref structure, use avc_entry_ref_init to
       initialize it before passing it to avc_has_perm or avc_has_perm_noaudit
       for  the	 first	time.	Using  an uninitialized structure will produce
       undefined behavior.

       If requested permissions are granted, zero is returned.	 If  requested
       permissions are denied or an error occured, -1 is returned and errno is
       set appropriately.

       In permissive mode, zero will be returned and errno unchanged  even  if
       permissions were denied.	 avc_has_perm will still produce an audit mes‐
       sage in this case.

       EACCES A requested permission was denied.

       EINVAL The tclass and/or the security contexts referenced by  ssid  and
	      tsid are not recognized by the currently loaded policy.

       ENOMEM An attempt to allocate memory failed.

       Internal errors encountered by the userspace AVC may cause certain val‐
       ues of errno to be returned unexpectedly.  For example, netlink	socket
       errors  may  produce EACCES or EINVAL.  Make sure that userspace object
       managers are granted appropriate access to netlink by the policy.

       Eamon Walsh <ewalsh@tycho.nsa.gov>

       avc_init(3), avc_context_to_sid(3),  avc_cache_stats(3),	 avc_add_call‐
       back(3), security_compute_av(3) selinux(8)

				  27 May 2004		       avc_has_perm(3)

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