+/*
+ * COPYRIGHT (c) 2006
+ * The Regents of the University of Michigan
+ * ALL RIGHTS RESERVED
+ *
+ * Permission is granted to use, copy, create derivative works
+ * and redistribute this software and such derivative works
+ * for any purpose, so long as the name of The University of
+ * Michigan is not used in any advertising or publicity
+ * pertaining to the use of distribution of this software
+ * without specific, written prior authorization. If the
+ * above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any
+ * portion of this software, then the disclaimer below must
+ * also be included.
+ *
+ * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
+ * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
+ * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
+ * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
+ * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
+ * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
+ * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
+ * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGES.
+ */
+
+#include "config.h"
+
+#ifdef HAVE_LUCID_CONTEXT_SUPPORT
+
+/*
+ * Newer versions of MIT and Heimdal have lucid context support.
+ * We can use common code if it is supported.
+ */
+
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+#include "gss_util.h"
+#include "gss_oids.h"
+#include "err_util.h"
+#include "context.h"
+
+#include <krb5.h>
+#include <gssapi/gssapi.h>
+#ifndef OM_uint64
+typedef uint64_t OM_uint64;
+#endif
+#include <gssapi/gssapi_krb5.h>
+
+static int
+write_lucid_keyblock(char **p, char *end, gss_krb5_lucid_key_t *key)
+{
+ gss_buffer_desc tmp;
+
+ if (WRITE_BYTES(p, end, key->type)) return -1;
+ tmp.length = key->length;
+ tmp.value = key->data;
+ if (write_buffer(p, end, &tmp)) return -1;
+ return 0;
+}
+
+static int
+prepare_krb5_rfc1964_buffer(gss_krb5_lucid_context_v1_t *lctx,
+ gss_buffer_desc *buf)
+{
+ char *p, *end;
+ static int constant_zero = 0;
+ unsigned char fakeseed[16];
+ uint32_t word_send_seq;
+ gss_krb5_lucid_key_t enc_key;
+ int i;
+ char *skd, *dkd;
+ gss_buffer_desc fakeoid;
+
+ /*
+ * The new Kerberos interface to get the gss context
+ * does not include the seed or seed_init fields
+ * because we never really use them. But for now,
+ * send down a fake buffer so we can use the same
+ * interface to the kernel.
+ */
+ memset(&enc_key, 0, sizeof(enc_key));
+ memset(&fakeoid, 0, sizeof(fakeoid));
+
+ if (!(buf->value = calloc(1, MAX_CTX_LEN)))
+ goto out_err;
+ p = buf->value;
+ end = buf->value + MAX_CTX_LEN;
+
+ if (WRITE_BYTES(&p, end, lctx->initiate)) goto out_err;
+
+ /* seed_init and seed not used by kernel anyway */
+ if (WRITE_BYTES(&p, end, constant_zero)) goto out_err;
+ if (write_bytes(&p, end, &fakeseed, 16)) goto out_err;
+
+ if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.sign_alg)) goto out_err;
+ if (WRITE_BYTES(&p, end, lctx->rfc1964_kd.seal_alg)) goto out_err;
+ if (WRITE_BYTES(&p, end, lctx->endtime)) goto out_err;
+ word_send_seq = lctx->send_seq; /* XXX send_seq is 64-bit */
+ if (WRITE_BYTES(&p, end, word_send_seq)) goto out_err;
+ if (write_oid(&p, end, &krb5oid)) goto out_err;
+
+#ifdef HAVE_HEIMDAL
+ /*
+ * The kernel gss code expects des-cbc-raw for all flavors of des.
+ * The keytype from MIT has this type, but Heimdal does not.
+ * Force the Heimdal keytype to 4 (des-cbc-raw).
+ * Note that the rfc1964 version only supports DES enctypes.
+ */
+ if (lctx->rfc1964_kd.ctx_key.type != 4) {
+ printerr(1, "prepare_krb5_rfc1964_buffer: "
+ "overriding heimdal keytype (%d => %d)\n",
+ lctx->rfc1964_kd.ctx_key.type, 4);
+ lctx->rfc1964_kd.ctx_key.type = 4;
+ }
+#endif
+ printerr(2, "prepare_krb5_rfc1964_buffer: serializing keys with "
+ "enctype %d and length %d\n",
+ lctx->rfc1964_kd.ctx_key.type,
+ lctx->rfc1964_kd.ctx_key.length);
+
+ /* derive the encryption key and copy it into buffer */
+ enc_key.type = lctx->rfc1964_kd.ctx_key.type;
+ enc_key.length = lctx->rfc1964_kd.ctx_key.length;
+ if ((enc_key.data = calloc(1, enc_key.length)) == NULL)
+ goto out_err;
+ skd = (char *) lctx->rfc1964_kd.ctx_key.data;
+ dkd = (char *) enc_key.data;
+ for (i = 0; i < enc_key.length; i++)
+ dkd[i] = skd[i] ^ 0xf0;
+ if (write_lucid_keyblock(&p, end, &enc_key)) {
+ free(enc_key.data);
+ goto out_err;
+ }
+ free(enc_key.data);
+
+ if (write_lucid_keyblock(&p, end, &lctx->rfc1964_kd.ctx_key))
+ goto out_err;
+
+ buf->length = p - (char *)buf->value;
+ return 0;
+out_err:
+ printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
+ if (buf->value) free(buf->value);
+ buf->length = 0;
+ if (enc_key.data) free(enc_key.data);
+ return -1;
+}
+
+static int
+prepare_krb5_rfc_cfx_buffer(gss_krb5_lucid_context_v1_t *lctx,
+ gss_buffer_desc *buf)
+{
+ printerr(0, "ERROR: prepare_krb5_rfc_cfx_buffer: not implemented\n");
+ return -1;
+}
+
+
+int
+serialize_krb5_ctx(gss_ctx_id_t ctx, gss_buffer_desc *buf)
+{
+ OM_uint32 maj_stat, min_stat;
+ void *return_ctx = 0;
+ OM_uint32 vers;
+ gss_krb5_lucid_context_v1_t *lctx = 0;
+ int retcode = 0;
+
+ printerr(2, "DEBUG: serialize_krb5_ctx: lucid version!\n");
+ maj_stat = gss_export_lucid_sec_context(&min_stat, &ctx,
+ 1, &return_ctx);
+ if (maj_stat != GSS_S_COMPLETE) {
+ pgsserr("gss_export_lucid_sec_context",
+ maj_stat, min_stat, &krb5oid);
+ goto out_err;
+ }
+
+ /* Check the version returned, we only support v1 right now */
+ vers = ((gss_krb5_lucid_context_version_t *)return_ctx)->version;
+ switch (vers) {
+ case 1:
+ lctx = (gss_krb5_lucid_context_v1_t *) return_ctx;
+ break;
+ default:
+ printerr(0, "ERROR: unsupported lucid sec context version %d\n",
+ vers);
+ goto out_err;
+ break;
+ }
+
+ /* Now lctx points to a lucid context that we can send down to kernel */
+ if (lctx->protocol == 0)
+ retcode = prepare_krb5_rfc1964_buffer(lctx, buf);
+ else
+ retcode = prepare_krb5_rfc_cfx_buffer(lctx, buf);
+
+ maj_stat = gss_free_lucid_sec_context(&min_stat, ctx, return_ctx);
+ if (maj_stat != GSS_S_COMPLETE) {
+ pgsserr("gss_export_lucid_sec_context",
+ maj_stat, min_stat, &krb5oid);
+ printerr(0, "WARN: failed to free lucid sec context\n");
+ }
+
+ if (retcode) {
+ printerr(1, "serialize_krb5_ctx: prepare_krb5_*_buffer "
+ "failed (retcode = %d)\n", retcode);
+ goto out_err;
+ }
+
+ return 0;
+
+out_err:
+ printerr(0, "ERROR: failed serializing krb5 context for kernel\n");
+ return -1;
+}
+#endif /* HAVE_LUCID_CONTEXT_SUPPORT */
projects / nfs-utils.git / commitdiff