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AC_AuthCompute(3)					     AC_AuthCompute(3)

       AC_AuthCompute - Compute authorization (CDSA)

       # include <cdsa/cssm.h>

       const CSSM_TUPLEGROUP *BaseAuthorizations, const CSSM_TUPLEGROUP	 *Cre‐
       dentials, uint32 NumberOfRequestors, const CSSM_LIST *Requestors, const
       CSSM_LIST *RequestedAuthorizationPeriod, const CSSM_LIST	 *RequestedAu‐
       thorization, CSSM_TUPLEGROUP_PTR AuthorizationResult)

       SPI: CSSM_RETURN CSSMACI AC_AuthCompute (CSSM_AC_HANDLE ACHandle, const
       CSSM_TUPLEGROUP	*BaseAuthorizations,  const  CSSM_TUPLEGROUP  *Creden‐
       tials,  uint32  NumberOfRequestors,  const CSSM_LIST *Requestors, const
       CSSM_LIST *RequestedAuthorizationPeriod, const CSSM_LIST	 *RequestedAu‐
       thorization, CSSM_TUPLEGROUP_PTR AuthorizationResult)

       Common Security Services Manager library (

       The  handle that describes the authorization computation module used to
       perform this function.  A pointer to a  CSSM_TUPLEGROUP	containing  at
       least one ACL certificate, specifying the authorization granted to cer‐
       tain root keys, named entities or combinations thereof. A NULL group of
       BaseAuthorizations  always  results  in	a NULL AuthorizationResult.  A
       pointer to a CSSM_TUPLEGROUP containing a  group	 of  certificates,  in
       TUPLE  form. The tuple-certificates define the delegation of authoriza‐
       tions from the BaseAuthorizations to the Requestors.  If no  additional
       authorization-granting tuples are provided, then this value is NULL and
       the BaseAuthorizations are the only source  of  trusted	authorizations
       used  as input to the authorization computation.	 The number of entries
       in the Requestors array.	 A pointer to a list of requestors that define
       the   "who"   portion   of  the	request.  The  list  can  be  of  type
       CSSM_LIST_TYPE_SEXPR. Typical exhibits include: Public keys  Hashes  of
       keys  Hashes  of	 other	objects	 offered for proof.  A list defining a
       validity period or NULL (implying "all time").  This is the "when" por‐
       tion of the request.

	      If  the  list is of type CSSM_LIST_TYPE_SEXPR, then the validity
	      interval is specified as a two-element list containing the  val‐
	      ues  ((not-before	 <date1>)(not-after <date2 >)). Note that each
	      element is a two-element sublist. The <date> is  represented  by
	      an    ASCII   byte-string,   in	the   format   (for   example)
	      "1998-11-24_15:06:16" and is assumed to be GMT. Open-ended  time
	      intervals are specified by omitting either of the interval ends.
	      For example, ((not-before 1997-1-1_00:00:0)) specifies all dates
	      and  times  beginning  on	 January 1, 1997 going forward indefi‐
	      nitely.  For programming convenience, when  testing  for	autho‐
	      rization at a single point in time, the date is represented by a
	      one-element list	containing  (<date>).	A  list	 defining  the
	      "what" portion of the authorization being requested.

	      If  the  list  is	 of  type  CSSM_LIST_TYPE_SEXPR, then the list
	      presents an authorization request in SPKI format. If a  specific
	      authorization  is being requested, then this input is a two-ele‐
	      ment SEXPR list containing (tag <req>).  The  valid  values  for
	      <req>  are  application-specific. If this is a request to derive
	      all possible authorizations  based  on  the  BaseAuthorizations,
	      Credentials,  and	 Requestors, then this input value must be the
	      two-element list containing (tag (*)). This list corresponds  to
	      "all  authorizations".  With  this input, the function tests the
	      provided ACL and certificates against the Requestors (and possi‐
	      bly  RequestedAuthorizationPeriod)  to  yield all authorizations
	      for which the  provided  Exhibits	 qualify.   A  CSSM_TUPLEGROUP
	      structure,  giving  the result of the authorization computation.
	      Typically there will be one result, but there could be  as  many
	      as  there	 are entries in the BaseAuthorizations.	 Each of these
	      results says, in effect: "for this machine, under this  ACL  and
	      the provided certificates, relative to the specified Requestors,
	      the following authorizations have been  deduced".	 Those	autho‐
	      rizations are available only on the current platform (and possi‐
	      bly only for the application providing the ACL), and are	there‐
	      fore  in the form of an ACL. They are not intended to be used by
	      any other machine or application instance, necessarily, and need
	      to  be  converted	 into  certificates signed by some private key
	      available to the caller if they are to be so used.

       This function performs an authorization	computation  and  returns  the
       results	as  a group of tuple certificates. The computation is based on
       the following input  values:  One  or  more  items  that	 identify  the
       requestor. These items are matched against subject fields in BaseAutho‐
       rizations or Credentials.  These will be of any form that occurs in  an
       ACL  or	certificate, and the class of entries is extensible.  AuthCom‐
       pute uses these fields to compare against Subject fields of TUPLES  but
       does  not  interpret  them,  so	it  does not need to be aware of these
       extensions.  Requestors, taken together with RequestedAuthorization and
       RequestedAuthorizationPeriod,  form  request  tuples  of	 the form "who
       requests what, when."  Requestors can be public keys that  verify  some
       signed  request,	 hashes	 of objects submitted for proof of permission,
       etc. In general, there will be only one Requestor, typically the public
       key of some keyholder signing a request or authenticating a connection.
       The authorization against which the Requestors are being tested in this
       computation.   The  time	 range	of  an authorization computation.  The
       group of ACL entries (unsigned certificates) provided as the basis  for
       this  computation.  A group of tuple-certificates used with the BaseAu‐
       thorizations to grant authorizations to the Requestors.

	      Kind of Subject	  Example Requestor
	      Public key	  (public-key (rsa-pkcs1-sha1 (e #03#) (n ##)))
	      Hash  of	object,	  (hash md5 #900150983cd24fb0d6963f7d28e17f72#)
	      key,    template,

       The most likely Requestor is a public key that signs a request. In com‐
       mon  practice  there  will  be one Requestor per computation, but it is
       possible for an ACL or certificate to require  multiple	signatures  or
       other  forms  of identification before an action is authorized. In that
       case, there must be multiple Requestors. This function can be  used  in
       the following modes: To verify the authorization of a specific request,
       backed up by specific Requestors To compute the set  of	authorizations
       that  a particular set of Requestors has been granted by the BaseAutho‐
       rizations and Credentials.

       When using this function to verify an authorization,  the  RequestedAu‐
       thorization  is	the  specific  authorization  being  requested and the
       RequestedAuthorizationPeriod gives the date and time  of	 that  request
       (typically  the	current	 date  and  time)  using  both	NOT_BEFORE and
       NOT_AFTER dates. The result, if any, should be an ACL  entry  with  the
       same authorization that was requested. If such an ACL entry is produced
       by the computation, then the request is authorized.

       Requested Authorization Example
       (http )
       (ftp write)
       Requested Authorization Period Example
       (valid	     (not-before	 "1999-07-28_17:00:44")		(not-after

       When using this function to compute the full set of possible authoriza‐
       tions from a set of credentials,	 rather	 than  to  verify  a  specific
       access	request,   the	 inputs	 should	 be  of	 the  following	 form:
       RequestedAuthorizationPeriod is	either	an  empty  list	 or  the  list
       "valid",	 indicating  "all  time".   RequestedAuthorization is the list
       "*", indicating all possible authorizations.

       The result of this computation, if any, will be one or more ACL entries
       representing   all   the	  granted  authorizations  for	the  indicated

       The scope of ACLs output from this function is  limited	to  the	 local
       system.	Each  ACL  should  be  interpreted to mean: "for this machine,
       under these base authorization ACLs and the provided certificates, rel‐
       ative  to  the  specified requestors, the following authorizations have
       been deduced". Those authorizations are available only on  the  current
       platform	 (and possibly only for the application providing the ACL) and
       are therefore in the form of an ACL. They are not intended to  be  used
       by  any	other  machine or application instance. However, the resulting
       ACLs can be transferred and used outside	 of  the  local	 scope	by  an
       entity with authority in the target scope/environment. The transfer and
       use is a three-step process: Convert the ACL into one or more  certifi‐
       cates.  The certificates must be signed by some private key with appro‐
       priate authority in the target scope/environment.   Transfer  the  cer‐
       tificates  to  the  target environment.	Use the signed certificates as
       input Credentials to this function in the target scope/environment.

       If the function is successful,  check  (*AuthorizationResult)->NumCerts
       to  determine the precise number of authorizations granted by this com‐
       putation. If 0, then the requestors were not authorized.

       A CSSM_RETURN value indicating success or specifying a particular error
       condition. The value CSSM_OK indicates success. All other values repre‐
       sent an error condition.

       Errors  are  described	in   the   CDSA	  technical   standard.	   See


       Intel CDSA Application Developer's Guide (see CDSA_intro(3))

       Reference Pages

       Functions for the CSSM API:

       CSSM_TP_CertGroupToTupleGroup(3), CSSM_TP_TupleGroupToCertGroup(3)

       Functions for the AC SPI:

       TP_CertGroupToTupleGroup(3), TP_TupleGroupToCertGroup(3)


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