vrfy_mic.c

#include "mysccs.h"
SCCSID("@(#)$Id: //tools/src/freeware/gsskrb5/vrfy_mic.c#2 $")

/************************************************************************
 * $Id: //tools/src/freeware/gsskrb5/vrfy_mic.c#2 $
 ************************************************************************
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *    distribution.
 *
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 *    software must display the following acknowledgment:
 *    "This product includes software developed by SAP AG"
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 ************************************************************************/


#include "gssmaini.h"


/*
 * gn_gss_verify_mic()
 *
 *
 */
OM_uint32
gn_gss_verify_mic(
	OM_uint32	FAR *	pp_min_stat,	/* minor_status		*/
	gss_ctx_id_t		p_in_context,	/* context_handle	*/
	gss_buffer_t		p_in_message,	/* message_buffer	*/
	gss_buffer_t		p_in_token,	/* token_buffer		*/
	gss_qop_t	FAR *	pp_out_qop	/* qop_state		*/
     )
{
   char		     * this_Call = "gn_gss_verify_mic";
   gn_context_desc   * ctx       = NULL;
   Uchar	     * mic	 = NULL;
   size_t	       mic_len	 = 0;
   gn_mech_tag_et      mech_tag  = MECH_INVALID_TAG;
   OM_uint32	       maj_stat  = GSS_S_COMPLETE;


   (*pp_min_stat)   = MINOR_NO_ERROR;

   if ( p_in_token==NULL
	||  p_in_token->value==NULL  ||  p_in_token->length==0  ) {
      DEBUG_ERR((tf, "  E: %s(): Missing MIC-token gss_buffer_desc !\n", this_Call))
      RETURN_MIN_MAJ( MINOR_NO_ERROR, GSS_S_CALL_INACCESSIBLE_READ|GSS_S_FAILURE );
   }

   /* NOTICE: We may be processing a ZERO-length message here !! */
   if ( p_in_message==NULL ) {
      DEBUG_ERR((tf, "  E: %s(): Missing message gss_buffer_desc !\n", this_Call))
      RETURN_MIN_MAJ( MINOR_NO_ERROR, GSS_S_CALL_INACCESSIBLE_READ|GSS_S_FAILURE );
   }

   maj_stat = gn_check_context( pp_min_stat, &p_in_context,
				CTX_MSG_IN, this_Call );
   if (maj_stat!=GSS_S_COMPLETE)
      return(maj_stat);

   ctx = (gn_context_desc *)(p_in_context);

   if ( (gn_mech[ctx->mech_tag]->use_raw_tokens) ) {
      /* this mechanism wants raw tokens, so we don't look at the framing */
      mic        = p_in_token->value;
      mic_len    = p_in_token->length;

   } else {
      /* parse the outer gssapi framing to reveal the inner token */

      /* pick the token apart and check the mechanism id field in it */
      maj_stat = gn_parse_gss_token( pp_min_stat, p_in_token, NULL, &mech_tag,
				     &mic, &mic_len );
      if ( maj_stat!=GSS_S_COMPLETE)
	 return(maj_stat);

      if (mech_tag!=ctx->mech_tag) {
	 DEBUG_ERR((tf, "  E: %s(): Wrong mechanism in token header!\n",
			this_Call ));
	 RETURN_MIN_MAJ( MINOR_WRONG_MECHANISM, GSS_S_DEFECTIVE_TOKEN );
      }

      if (maj_stat!=GSS_S_COMPLETE)
	 return(maj_stat);
   }

   maj_stat = gn_mech[ctx->mech_tag]
	    ->fp_verify_mic( pp_min_stat, ctx->prv_ctx,
			     p_in_message->value, p_in_message->length,
			     mic, mic_len, pp_out_qop );

   return(maj_stat);

} /* gn_gss_verify_mic() */