mech_krb5/mech/export_sec_context.c

	export_sec_context.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright 1999-2002 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * lib/gssapi/krb5/export_sec_context.c
 *
 * Copyright 1995 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 */

/*
 * export_sec_context.c - Externalize the security context.
 */
#include <gssapiP_krb5.h>
#include <k5-int.h>

OM_uint32
krb5_gss_export_sec_context(ct, minor_status, context_handle, interprocess_token)
    void        *ct;
    OM_uint32       *minor_status;
    gss_ctx_id_t    *context_handle;
    gss_buffer_t    interprocess_token;
{
    krb5_context    context = ct;
    krb5_error_code kret;
    OM_uint32       retval;
    size_t      bufsize, blen;
    krb5_gss_ctx_id_t   ctx;
    krb5_octet      *obuffer, *obp;

   /* Solaris Kerberos:  for MT safety, we avoid the use of a default
    * context via kg_get_context() */
#if 0
    if (GSS_ERROR(kg_get_context(minor_status, (krb5_context*) &context)))
        return(GSS_S_FAILURE);
#endif

    mutex_lock(&krb5_mutex);
    context = ct;

    /* Assume a tragic failure */
    obuffer = (krb5_octet *) NULL;
    retval = GSS_S_FAILURE;
    *minor_status = 0;

    if (!kg_validate_ctx_id(*context_handle)) {
        kret = (OM_uint32) G_VALIDATE_FAILED;
        retval = GSS_S_NO_CONTEXT;
        goto error_out;
    }

    ctx = (krb5_gss_ctx_id_t) *context_handle;

    /* Determine size needed for externalization of context */
    bufsize = 0;
    if ((kret = kg_ctx_size(context, (krb5_pointer) ctx,
                &bufsize)))
        goto error_out;

    /* Allocate the buffer */
    if ((obuffer = (krb5_octet *) xmalloc(bufsize)) == NULL) {
        kret = ENOMEM;
        goto error_out;
    }

    obp = obuffer;
    blen = bufsize;
    /* Externalize the context */
    if ((kret = kg_ctx_externalize(context,
                   (krb5_pointer) ctx, &obp, &blen)))
        goto error_out;

    /* Success!  Return the buffer */
    interprocess_token->length = bufsize - blen;
    interprocess_token->value = obuffer;
    *minor_status = 0;
    retval = GSS_S_COMPLETE;

    /* Now, clean up the context state */
    /* Note, calling non-locking interface */
    (void)krb5_gss_delete_sec_context_no_lock(context, minor_status, context_handle, NULL);
    *context_handle = GSS_C_NO_CONTEXT;

    mutex_unlock(&krb5_mutex);
    return (GSS_S_COMPLETE);

error_out:
    if (obuffer && bufsize) {
        memset(obuffer, 0, bufsize);
        krb5_xfree(obuffer);
    }
    if (*minor_status == 0)
        *minor_status = (OM_uint32) kret;
    mutex_unlock(&krb5_mutex);
    return(retval);
}