r19604: This is a massive commit, and I appologise in advance for it's size.

This merges Samba4 with lorikeet-heimdal, which itself has been
tracking Heimdal CVS for the past couple of weeks.

This is such a big change because Heimdal reorganised it's internal
structures, with the mechglue merge, and because many of our 'wishes' have been granted:  we now have DCE_STYLE GSSAPI, send_to_kdc hooks and many other features merged into the mainline code.  We have adapted to upstream's choice of API in these cases.

In gensec_gssapi and gensec_krb5, we either expect a valid PAC, or NO
PAC.  This matches windows behavour.  We also have an option to
require the PAC to be present (which allows us to automate the testing
of this code).

This also includes a restructure of how the kerberos dependencies are
handled, due to the fallout of the merge.

Andrew Bartlett
(This used to be commit 4826f1735197c2a471d771495e6d4c1051b4c471)

1 files changed, 285 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/spnego/compat.c b/source4/heimdal/lib/gssapi/spnego/compat.c
new file mode 100644
index 0000000000..aeae088258
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/spnego/compat.c
@@ -0,0 +1,285 @@
+/*
+ * Copyright (c) 2004, PADL Software Pty Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of PADL Software nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "spnego/spnego_locl.h"
+
+RCSID("$Id: compat.c,v 1.6 2006/10/07 22:26:59 lha Exp $");
+
+/*
+ * Apparently Microsoft got the OID wrong, and used
+ * 1.2.840.48018.1.2.2 instead. We need both this and
+ * the correct Kerberos OID here in order to deal with
+ * this. Because this is manifest in SPNEGO only I'd
+ * prefer to deal with this here rather than inside the
+ * Kerberos mechanism.
+ */
+static gss_OID_desc gss_mskrb_mechanism_oid_desc =
+	{9, (void *)"\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"};
+
+static gss_OID_desc gss_krb5_mechanism_oid_desc =
+	{9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
+
+/*
+ * Allocate a SPNEGO context handle
+ */
+OM_uint32 _gss_spnego_alloc_sec_context (OM_uint32 * minor_status,
+					 gss_ctx_id_t *context_handle)
+{
+    gssspnego_ctx ctx;
+
+    ctx = calloc(1, sizeof(*ctx));
+    if (ctx == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+
+    ctx->initiator_mech_types.len = 0;
+    ctx->initiator_mech_types.val = NULL;
+    ctx->preferred_mech_type = GSS_C_NO_OID;
+    ctx->negotiated_mech_type = GSS_C_NO_OID;
+    ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
+
+    /*
+     * Cache these so we can return them before returning
+     * GSS_S_COMPLETE, even if the mechanism has itself
+     * completed earlier
+     */
+    ctx->mech_flags = 0;
+    ctx->mech_time_rec = 0;
+    ctx->mech_src_name = GSS_C_NO_NAME;
+    ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
+
+    ctx->open = 0;
+    ctx->local = 0;
+    ctx->require_mic = 0;
+    ctx->verified_mic = 0;
+
+    HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
+
+    *context_handle = (gss_ctx_id_t)ctx;
+
+    return GSS_S_COMPLETE;
+}
+
+/*
+ * Free a SPNEGO context handle. The caller must have acquired
+ * the lock before this is called.
+ */
+OM_uint32 _gss_spnego_internal_delete_sec_context
+           (OM_uint32 *minor_status,
+            gss_ctx_id_t *context_handle,
+            gss_buffer_t output_token
+           )
+{
+    gssspnego_ctx ctx;
+    OM_uint32 ret, minor;
+
+    *minor_status = 0;
+
+    if (context_handle == NULL) {
+	return GSS_S_NO_CONTEXT;
+    }
+
+    if (output_token != GSS_C_NO_BUFFER) {
+	output_token->length = 0;
+	output_token->value = NULL;
+    }
+
+    ctx = (gssspnego_ctx)*context_handle;
+    *context_handle = GSS_C_NO_CONTEXT;
+
+    if (ctx == NULL) {
+	return GSS_S_NO_CONTEXT;
+    }
+
+    if (ctx->initiator_mech_types.val != NULL)
+	free_MechTypeList(&ctx->initiator_mech_types);
+
+    _gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);
+
+    gss_release_oid(&minor, &ctx->preferred_mech_type);
+    ctx->negotiated_mech_type = GSS_C_NO_OID;
+
+    gss_release_name(&minor, &ctx->mech_src_name);
+
+    if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) {
+	ret = gss_delete_sec_context(minor_status,
+				     &ctx->negotiated_ctx_id,
+				     output_token);
+	ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
+    } else {
+	ret = GSS_S_COMPLETE;
+    }
+
+    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+    HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
+
+    free(ctx);
+    *context_handle = NULL;
+
+    return ret;
+}
+
+/*
+ * For compatability with the Windows SPNEGO implementation, the
+ * default is to ignore the mechListMIC unless CFX is used and
+ * a non-preferred mechanism was negotiated
+ */
+
+OM_uint32
+_gss_spnego_require_mechlist_mic(OM_uint32 *minor_status,
+				 gssspnego_ctx ctx,
+				 int *require_mic)
+{
+    gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
+    OM_uint32 minor;
+
+    *minor_status = 0;
+    *require_mic = 0;
+
+    if (ctx == NULL) {
+	return GSS_S_COMPLETE;
+    }
+
+    if (ctx->require_mic) {
+	/* Acceptor requested it: mandatory to honour */
+	*require_mic = 1;
+	return GSS_S_COMPLETE;
+    }
+
+    /*
+     * Check whether peer indicated implicit support for updated SPNEGO
+     * (eg. in the Kerberos case by using CFX)
+     */
+    if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id,
+				       GSS_C_PEER_HAS_UPDATED_SPNEGO,
+				       &buffer_set) == GSS_S_COMPLETE) {
+	*require_mic = 1;
+	gss_release_buffer_set(&minor, &buffer_set);
+    }
+
+    /* Safe-to-omit MIC rules follow */
+    if (*require_mic) {
+	if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) {
+	    *require_mic = 0;
+	} else if (gss_oid_equal(ctx->negotiated_mech_type, &gss_krb5_mechanism_oid_desc) &&
+		   gss_oid_equal(ctx->preferred_mech_type, &gss_mskrb_mechanism_oid_desc)) {
+	    *require_mic = 0;
+	}
+    }
+
+    return GSS_S_COMPLETE;
+}
+
+int _gss_spnego_add_mech_type(gss_OID mech_type,
+			      int includeMSCompatOID,
+			      MechTypeList *mechtypelist)
+{
+    int ret;
+
+    if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM))
+	return 0;
+
+    if (includeMSCompatOID &&
+	gss_oid_equal(mech_type, &gss_krb5_mechanism_oid_desc)) {
+	ret = der_get_oid(gss_mskrb_mechanism_oid_desc.elements,
+			  gss_mskrb_mechanism_oid_desc.length,
+			  &mechtypelist->val[mechtypelist->len],
+			  NULL);
+	if (ret)
+	    return ret;
+	mechtypelist->len++;
+    }
+    ret = der_get_oid(mech_type->elements,
+		      mech_type->length,
+		      &mechtypelist->val[mechtypelist->len],
+		      NULL);
+    if (ret)
+	return ret;
+    mechtypelist->len++;
+
+    return 0;
+}
+
+OM_uint32
+_gss_spnego_select_mech(OM_uint32 *minor_status,
+			MechType *mechType,
+			gss_OID *mech_p)
+{
+    char mechbuf[64];
+    size_t mech_len;
+    gss_OID_desc oid;
+    OM_uint32 ret;
+
+    ret = der_put_oid ((unsigned char *)mechbuf + sizeof(mechbuf) - 1,
+		       sizeof(mechbuf),
+		       mechType,
+		       &mech_len);
+    if (ret) {
+	return GSS_S_DEFECTIVE_TOKEN;
+    }
+
+    oid.length   = mech_len;
+    oid.elements = mechbuf + sizeof(mechbuf) - mech_len;
+
+    if (gss_oid_equal(&oid, GSS_SPNEGO_MECHANISM)) {
+	return GSS_S_BAD_MECH;
+    }
+
+    *minor_status = 0;
+
+    /* Translate broken MS Kebreros OID */
+    if (gss_oid_equal(&oid, &gss_mskrb_mechanism_oid_desc)) {
+	gssapi_mech_interface mech;
+
+	mech = __gss_get_mechanism(&gss_krb5_mechanism_oid_desc);
+	if (mech == NULL)
+	    return GSS_S_BAD_MECH;
+
+	ret = gss_duplicate_oid(minor_status,
+				&gss_mskrb_mechanism_oid_desc,
+				mech_p);
+    } else {
+	gssapi_mech_interface mech;
+
+	mech = __gss_get_mechanism(&oid);
+	if (mech == NULL)
+	    return GSS_S_BAD_MECH;
+
+	ret = gss_duplicate_oid(minor_status,
+				&mech->gm_mech_oid,
+				mech_p);
+    }
+
+    return ret;
+}
+