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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,   secu-
       rity_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.  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 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)