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-.\" $Id: acl_check.3,v 1.2 1996/06/12 21:29:08 bg Exp $
-.\" Copyright 1989 by the Massachusetts Institute of Technology.
-.\"
-.\" For copying and distribution information,
-.\" please see the file <mit-copyright.h>.
-.\"
-.TH ACL_CHECK 3 "Kerberos Version 4.0" "MIT Project Athena"
-.SH NAME
-acl_canonicalize_principal, acl_check, acl_exact_match, acl_add,
-acl_delete, acl_initialize \- Access control list routines
-.SH SYNOPSIS
-.nf
-.nj
-.ft B
-cc <files> \-lacl \-lkrb
-.PP
-.ft B
-#include <krb.h>
-.PP
-.ft B
-acl_canonicalize_principal(principal, buf)
-char *principal;
-char *buf;
-.PP
-.ft B
-acl_check(acl, principal)
-char *acl;
-char *principal;
-.PP
-.ft B
-acl_exact_match(acl, principal)
-char *acl;
-char *principal;
-.PP
-.ft B
-acl_add(acl, principal)
-char *acl;
-char *principal;
-.PP
-.ft B
-acl_delete(acl, principal)
-char *acl;
-char *principal;
-.PP
-.ft B
-acl_initialize(acl_file, mode)
-char *acl_file;
-int mode;
-.fi
-.ft R
-.SH DESCRIPTION
-.SS Introduction
-.PP
-An access control list (ACL) is a list of principals, where each
-principal is represented by a text string which cannot contain
-whitespace.  The library allows application programs to refer to named
-access control lists to test membership and to atomically add and
-delete principals using a natural and intuitive interface.  At
-present, the names of access control lists are required to be Unix
-filenames, and refer to human-readable Unix files; in the future, when
-a networked ACL server is implemented, the names may refer to a
-different namespace specific to the ACL service.
-.PP
-.SS Principal Names
-.PP
-Principal names have the form
-.nf
-.in +5n
-<name>[.<instance>][@<realm>]
-.in -5n
-e.g.:
-.in +5n
-asp
-asp.root
-asp@ATHENA.MIT.EDU
-asp.@ATHENA.MIT.EDU
-asp.root@ATHENA.MIT.EDU
-.in -5n
-.fi
-It is possible for principals to be underspecified.  If an instance is
-missing, it is assumed to be "".  If realm is missing, it is assumed
-to be the local realm as determined by
-.IR krb_get_lrealm (3).
-The canonical form contains all of name, instance,
-and realm; the acl_add and acl_delete routines will always
-leave the file in that form.  Note that the canonical form of
-asp@ATHENA.MIT.EDU is actually asp.@ATHENA.MIT.EDU.
-.SS Routines
-.PP
-.I acl_canonicalize_principal
-stores the canonical form of 
-.I principal
-in 
-.IR buf .
-.I Buf
-must contain enough
-space to store a principal, given the limits on the sizes of name,
-instance, and realm specified as ANAME_SZ, INST_SZ, and REALM_SZ,
-respectively, in
-.IR /usr/include/krb.h .
-.PP
-.I acl_check
-returns nonzero if
-.I principal
-appears in 
-.IR acl .
-Returns 0 if principal
-does not appear in acl, or if an error occurs.  Canonicalizes
-principal before checking, and allows the ACL to contain wildcards.  The
-only supported wildcards are entries of the form
-name.*@realm, *.*@realm, and *.*@*.  An asterisk matches any value for the
-its component field.  For example, "jtkohl.*@*" would match principal
-jtkohl, with any instance and any realm.
-.PP
-.I acl_exact_match
-performs like 
-.IR acl_check ,
-but does no canonicalization or wildcard matching.
-.PP
-.I acl_add
-atomically adds 
-.I principal
-to 
-.IR acl .
-Returns 0 if successful, nonzero otherwise.  It is considered a failure
-if
-.I principal
-is already in 
-.IR acl .
-This routine will canonicalize
-.IR principal ,
-but will treat wildcards literally.
-.PP
-.I acl_delete
-atomically deletes 
-.I principal
-from 
-.IR acl .
-Returns 0 if successful,
-nonzero otherwise.  It is considered a failure if 
-.I principal
-is not
-already in 
-.IR acl .
-This routine will canonicalize 
-.IR principal ,
-but will treat wildcards literally.
-.PP
-.I acl_initialize
-initializes
-.IR acl_file .
-If the file 
-.I acl_file
-does not exist,
-.I acl_initialize
-creates it with mode
-.IR mode .
-If the file
-.I acl_file
-exists,
-.I acl_initialize
-removes all members.  Returns 0 if successful,
-nonzero otherwise.  WARNING: Mode argument is likely to change with
-the eventual introduction of an ACL service.  
-.SH NOTES
-In the presence of concurrency, there is a very small chance that
-.I acl_add
-or
-.I acl_delete
-could report success even though it would have
-had no effect.  This is a necessary side effect of using lock files
-for concurrency control rather than flock(2), which is not supported
-by NFS.
-.PP
-The current implementation caches ACLs in memory in a hash-table
-format for increased efficiency in checking membership; one effect of
-the caching scheme is that one file descriptor will be kept open for
-each ACL cached, up to a maximum of 8.
-.SH SEE ALSO
-kerberos(3), krb_get_lrealm(3)
-.SH AUTHOR
-James Aspnes (MIT Project Athena)