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/*
* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000-2002 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* $Id: gssapi_link.c,v 1.1.4.1 2004/12/09 04:07:17 marka Exp $
*/
#ifdef GSSAPI
#include <config.h>
#include <isc/buffer.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dst/result.h>
#include "dst_internal.h"
#include "dst_parse.h"
#include <gssapi/gssapi.h>
#define INITIAL_BUFFER_SIZE 1024
#define BUFFER_EXTRA 1024
#define REGION_TO_GBUFFER(r, gb) \
do { \
(gb).length = (r).length; \
(gb).value = (r).base; \
} while (0)
typedef struct gssapi_ctx {
isc_buffer_t *buffer;
gss_ctx_id_t *context_id;
} gssapi_ctx_t;
static isc_result_t
gssapi_createctx(dst_key_t *key, dst_context_t *dctx) {
gssapi_ctx_t *ctx;
isc_result_t result;
UNUSED(key);
ctx = isc_mem_get(dctx->mctx, sizeof(gssapi_ctx_t));
if (ctx == NULL)
return (ISC_R_NOMEMORY);
ctx->buffer = NULL;
result = isc_buffer_allocate(dctx->mctx, &ctx->buffer,
INITIAL_BUFFER_SIZE);
if (result != ISC_R_SUCCESS) {
isc_mem_put(dctx->mctx, ctx, sizeof(gssapi_ctx_t));
return (result);
}
ctx->context_id = key->opaque;
dctx->opaque = ctx;
return (ISC_R_SUCCESS);
}
static void
gssapi_destroyctx(dst_context_t *dctx) {
gssapi_ctx_t *ctx = dctx->opaque;
if (ctx != NULL) {
if (ctx->buffer != NULL)
isc_buffer_free(&ctx->buffer);
isc_mem_put(dctx->mctx, ctx, sizeof(gssapi_ctx_t));
dctx->opaque = NULL;
}
}
static isc_result_t
gssapi_adddata(dst_context_t *dctx, const isc_region_t *data) {
gssapi_ctx_t *ctx = dctx->opaque;
isc_buffer_t *newbuffer = NULL;
isc_region_t r;
unsigned int length;
isc_result_t result;
result = isc_buffer_copyregion(ctx->buffer, data);
if (result == ISC_R_SUCCESS)
return (ISC_R_SUCCESS);
length = isc_buffer_length(ctx->buffer) + data->length + BUFFER_EXTRA;
result = isc_buffer_allocate(dctx->mctx, &newbuffer, length);
if (result != ISC_R_SUCCESS)
return (result);
isc_buffer_usedregion(ctx->buffer, &r);
(void) isc_buffer_copyregion(newbuffer, &r);
(void) isc_buffer_copyregion(newbuffer, data);
isc_buffer_free(&ctx->buffer);
ctx->buffer = newbuffer;
return (ISC_R_SUCCESS);
}
static isc_result_t
gssapi_sign(dst_context_t *dctx, isc_buffer_t *sig) {
gssapi_ctx_t *ctx = dctx->opaque;
isc_region_t message;
gss_buffer_desc gmessage, gsig;
OM_uint32 minor, gret;
isc_buffer_usedregion(ctx->buffer, &message);
REGION_TO_GBUFFER(message, gmessage);
gret = gss_get_mic(&minor, ctx->context_id,
GSS_C_QOP_DEFAULT, &gmessage, &gsig);
if (gret != 0)
return (ISC_R_FAILURE);
if (gsig.length > isc_buffer_availablelength(sig)) {
gss_release_buffer(&minor, &gsig);
return (ISC_R_NOSPACE);
}
isc_buffer_putmem(sig, gsig.value, gsig.length);
gss_release_buffer(&minor, &gsig);
return (ISC_R_SUCCESS);
}
static isc_result_t
gssapi_verify(dst_context_t *dctx, const isc_region_t *sig) {
gssapi_ctx_t *ctx = dctx->opaque;
isc_region_t message;
gss_buffer_desc gmessage, gsig;
OM_uint32 minor, gret;
isc_buffer_usedregion(ctx->buffer, &message);
REGION_TO_GBUFFER(message, gmessage);
REGION_TO_GBUFFER(*sig, gsig);
gret = gss_verify_mic(&minor, ctx->context_id, &gmessage, &gsig, NULL);
if (gret != 0)
return (ISC_R_FAILURE);
return (ISC_R_SUCCESS);
}
static isc_boolean_t
gssapi_compare(const dst_key_t *key1, const dst_key_t *key2) {
gss_ctx_id_t gsskey1 = key1->opaque;
gss_ctx_id_t gsskey2 = key2->opaque;
/* No idea */
return (ISC_TF(gsskey1 == gsskey2));
}
static isc_result_t
gssapi_generate(dst_key_t *key, int unused) {
UNUSED(key);
UNUSED(unused);
/* No idea */
return (ISC_R_FAILURE);
}
static isc_boolean_t
gssapi_isprivate(const dst_key_t *key) {
UNUSED(key);
return (ISC_TRUE);
}
static void
gssapi_destroy(dst_key_t *key) {
UNUSED(key);
/* No idea */
}
static dst_func_t gssapi_functions = {
gssapi_createctx,
gssapi_destroyctx,
gssapi_adddata,
gssapi_sign,
gssapi_verify,
NULL, /* computesecret */
gssapi_compare,
NULL, /* paramcompare */
gssapi_generate,
gssapi_isprivate,
gssapi_destroy,
NULL, /* todns */
NULL, /* fromdns */
NULL, /* tofile */
NULL, /* parse */
NULL, /* cleanup */
};
isc_result_t
dst__gssapi_init(dst_func_t **funcp) {
REQUIRE(funcp != NULL);
if (*funcp == NULL)
*funcp = &gssapi_functions;
return (ISC_R_SUCCESS);
}
#else
int gssapi_link_unneeded = 1;
#endif
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