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      1 /*
      2  * lib/gssapi/krb5/export_sec_context.c
      3  *
      4  * Copyright 1995 by the Massachusetts Institute of Technology.
      5  * All Rights Reserved.
      6  *
      7  * Export of this software from the United States of America may
      8  *   require a specific license from the United States Government.
      9  *   It is the responsibility of any person or organization contemplating
     10  *   export to obtain such a license before exporting.
     11  *
     12  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
     13  * distribute this software and its documentation for any purpose and
     14  * without fee is hereby granted, provided that the above copyright
     15  * notice appear in all copies and that both that copyright notice and
     16  * this permission notice appear in supporting documentation, and that
     17  * the name of M.I.T. not be used in advertising or publicity pertaining
     18  * to distribution of the software without specific, written prior
     19  * permission.  Furthermore if you modify this software you must label
     20  * your software as modified software and not distribute it in such a
     21  * fashion that it might be confused with the original M.I.T. software.
     22  * M.I.T. makes no representations about the suitability of
     23  * this software for any purpose.  It is provided "as is" without express
     24  * or implied warranty.
     25  *
     26  */
     27 
     28 /*
     29  * export_sec_context.c	- Externalize the security context.
     30  */
     31 #include "gssapiP_krb5.h"
     32 
     33 OM_uint32
     34 krb5_gss_export_sec_context(minor_status, context_handle, interprocess_token)
     35     OM_uint32		*minor_status;
     36     gss_ctx_id_t	*context_handle;
     37     gss_buffer_t	interprocess_token;
     38 {
     39     krb5_context	context;
     40     krb5_error_code	kret;
     41     OM_uint32		retval;
     42     size_t		bufsize, blen;
     43     krb5_gss_ctx_id_t	ctx;
     44     krb5_octet		*obuffer, *obp;
     45 
     46     /* Assume a tragic failure */
     47     obuffer = (krb5_octet *) NULL;
     48     retval = GSS_S_FAILURE;
     49     *minor_status = 0;
     50 
     51     if (!kg_validate_ctx_id(*context_handle)) {
     52 	    kret = (OM_uint32) G_VALIDATE_FAILED;
     53 	    retval = GSS_S_NO_CONTEXT;
     54 	    goto error_out;
     55     }
     56 
     57     ctx = (krb5_gss_ctx_id_t) *context_handle;
     58     context = ctx->k5_context;
     59     kret = krb5_gss_ser_init(context);
     60     if (kret)
     61 	goto error_out;
     62 
     63     /* Determine size needed for externalization of context */
     64     bufsize = 0;
     65     if ((kret = kg_ctx_size(context, (krb5_pointer) ctx,
     66 			    &bufsize)))
     67 	    goto error_out;
     68 
     69     /* Allocate the buffer */
     70     if ((obuffer = (krb5_octet *) xmalloc(bufsize)) == NULL) {
     71 	    kret = ENOMEM;
     72 	    goto error_out;
     73     }
     74 
     75     obp = obuffer;
     76     blen = bufsize;
     77     /* Externalize the context */
     78     if ((kret = kg_ctx_externalize(context,
     79 				   (krb5_pointer) ctx, &obp, &blen)))
     80 	    goto error_out;
     81 
     82     /* Success!  Return the buffer */
     83     interprocess_token->length = bufsize - blen;
     84     interprocess_token->value = obuffer;
     85     *minor_status = 0;
     86     retval = GSS_S_COMPLETE;
     87 
     88     /* Now, clean up the context state */
     89     (void)krb5_gss_delete_sec_context(minor_status, context_handle, NULL);
     90     *context_handle = GSS_C_NO_CONTEXT;
     91 
     92     return (GSS_S_COMPLETE);
     93 
     94 error_out:
     95     if (obuffer && bufsize) {
     96 	    memset(obuffer, 0, bufsize);
     97 	    xfree(obuffer);
     98     }
     99     if (*minor_status == 0)
    100 	    *minor_status = (OM_uint32) kret;
    101     return(retval);
    102 }
    103