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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>
       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_vector_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,  secu-
       rity_class_t  tclass,  access_vector_t  requested,  struct  av_decision
       *avd);
       int  security_compute_create(char  *scon,  char *tcon, security_class_t
       tclass, char **newcon);
       int   security_compute_create_raw(char   *scon,   char   *tcon,   secu-
       rity_class_t tclass, char **newcon);
       int   security_compute_create_name(char   *scon,   char   *tcon,  secu-
       rity_class_t tclass, const char *objname, char **newcon);
       int  security_compute_create_name_raw(char  *scon,  char  *tcon,  secu-
       rity_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,   secu-
       rity_class_t tclass, char **newcon);
       int  security_compute_member(char  *scon,  char *tcon, security_class_t
       tclass, char **newcon);
       int   security_compute_member_raw(char   *scon,   char   *tcon,   secu-
       rity_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 sup-
       ported: 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 cre-
       ation 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 cor-
       rect 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. This function is deprecated;
       use get_ordered_context_list(3) instead.
       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 contexts.
       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)