security_compute_av(3)              SELinux API documentation              security_compute_av(3)



NAME
       security_compute_av,   security_compute_av_flags,  security_compute_create,  security_com‐
       pute_create_name,   security_compute_relabel,    security_compute_member,    security_com‐
       pute_user, security_get_initial_context - query the SELinux policy database in the kernel

SYNOPSIS
       #include <selinux/selinux.h>
       #include <selinux/flask.h>

       int security_compute_av(char * scon, char * tcon, security_class_t tclass, access_vector_t
       requested, struct av_decision *avd);

       int security_compute_av_raw(char * scon, char * tcon, security_class_t tclass, access_vec‐
       tor_t requested, struct av_decision *avd);

       int   security_compute_av_flags(char   *  scon,  char  *  tcon,  security_class_t  tclass,
       access_vector_t requested, struct av_decision *avd);

       int security_compute_av_flags_raw(char *  scon,  char  *  tcon,  security_class_t  tclass,
       access_vector_t requested, struct av_decision *avd);

       int security_compute_create(char * scon, char * tcon, security_class_t tclass, char **new‐
       con);

       int security_compute_create_raw(char * scon, char * tcon,  security_class_t  tclass,  char
       **newcon);

       int  security_compute_create_name(char * scon, char * tcon, security_class_t tclass, const
       char *objname, char **newcon);

       int security_compute_create_name_raw(char * scon, char *  tcon,  security_class_t  tclass,
       const char *objname, char **newcon);

       int  security_compute_relabel(char  *  scon,  char  *  tcon, security_class_t tclass, char
       **newcon);

       int security_compute_relabel_raw(char * scon, char * tcon, security_class_t  tclass,  char
       **newcon);

       int security_compute_member(char * scon, char * tcon, security_class_t tclass, char **new‐
       con);

       int security_compute_member_raw(char * scon, char * tcon,  security_class_t  tclass,  char
       **newcon);

       int security_compute_user(char * scon, const char *username, char ***con);

       int security_compute_user_raw(char * scon, const char *username, char ***con);

       int security_get_initial_context(const char *name, char **con);

       int security_get_initial_context_raw(const char *name, char **con);

       int  selinux_check_access(const  char  * scon, const char * tcon, const char *class, const
       char *perm, void *auditdata);

       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 context 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 additionally 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 labeling 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 new‐
       con 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 polyin‐
       stantiated 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

       security_compute_av_raw(), security_compute_av_flags_raw(), security_compute_create_raw(),
       security_compute_create_name_raw(),                        security_compute_relabel_raw(),
       security_compute_member_raw(),               security_compute_user_raw()               and
       security_get_initial_context_raw() behave identically to their non-raw counterparts but do
       not perform context translation.

       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  con‐
       texts.

       checkPasswdAccess() is a deprecated alias of the selinux_check_passwd_access() function.

RETURN VALUE
       Returns zero on success or -1 on error.

SEE ALSO
       selinux(8), getcon(3), getfilecon(3), get_ordered_context_list(3)



russell AT coker.au                      1 January 2004                   security_compute_av(3)