Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 338 insertions, 0 deletions

diff --git a/auth/gensec/gensec_util.c b/auth/gensec/gensec_util.c
new file mode 100644
index 0000000..1075b9f
--- /dev/null
+++ b/auth/gensec/gensec_util.c
@@ -0,0 +1,338 @@
+/*
+   Unix SMB/CIFS implementation.
+
+   Generic Authentication Interface
+
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2006
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+#include "auth/common_auth.h"
+#include "../lib/util/asn1.h"
+#include "param/param.h"
+#include "libds/common/roles.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+NTSTATUS gensec_generate_session_info_pac(TALLOC_CTX *mem_ctx,
+					  struct gensec_security *gensec_security,
+					  struct smb_krb5_context *smb_krb5_context,
+					  DATA_BLOB *pac_blob,
+					  const char *principal_string,
+					  const struct tsocket_address *remote_address,
+					  struct auth_session_info **session_info)
+{
+	uint32_t session_info_flags = 0;
+	struct auth4_context *auth_context = NULL;
+	NTSTATUS status;
+
+	if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
+		session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
+	}
+
+	session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
+
+	if (!pac_blob) {
+		enum server_role server_role =
+			lpcfg_server_role(gensec_security->settings->lp_ctx);
+
+		/*
+		 * For any domain setup (DC or member) we require having
+		 * a PAC, as the service ticket comes from an AD DC,
+		 * which will always provide a PAC, unless
+		 * UF_NO_AUTH_DATA_REQUIRED is configured for our
+		 * account, but that's just an invalid configuration,
+		 * the admin configured for us!
+		 *
+		 * As a legacy case, we still allow kerberos tickets from an MIT
+		 * realm, but only in standalone mode. In that mode we'll only
+		 * ever accept a kerberos authentication with a keytab file
+		 * being explicitly configured via the 'keytab method' option.
+		 */
+		if (server_role != ROLE_STANDALONE) {
+			DBG_WARNING("Unable to find PAC in ticket from %s, "
+				    "failing to allow access\n",
+				    principal_string);
+			return NT_STATUS_NO_IMPERSONATION_TOKEN;
+		}
+		DBG_NOTICE("Unable to find PAC for %s, resorting to local "
+			   "user lookup\n", principal_string);
+	}
+
+	auth_context = gensec_security->auth_context;
+
+	if ((auth_context == NULL) ||
+	    (auth_context->generate_session_info_pac == NULL)) {
+		DBG_ERR("Cannot generate a session_info without "
+			"the auth_context\n");
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	status = auth_context->generate_session_info_pac(
+		auth_context,
+		mem_ctx,
+		smb_krb5_context,
+		pac_blob,
+		principal_string,
+		remote_address,
+		session_info_flags,
+		session_info);
+	return status;
+}
+
+/*
+  magic check a GSS-API wrapper packet for an Kerberos OID
+*/
+static bool gensec_gssapi_check_oid(const DATA_BLOB *blob, const char *oid)
+{
+	bool ret = false;
+	struct asn1_data *data = asn1_init(NULL, ASN1_MAX_TREE_DEPTH);
+
+	if (!data) return false;
+
+	if (!asn1_load(data, *blob)) goto err;
+	if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
+	if (!asn1_check_OID(data, oid)) goto err;
+
+	ret = !asn1_has_error(data);
+
+  err:
+
+	asn1_free(data);
+	return ret;
+}
+
+/**
+ * Check if the packet is one for the KRB5 mechansim
+ *
+ * NOTE: This is a helper that can be employed by multiple mechanisms, do
+ * not make assumptions about the private_data
+ *
+ * @param gensec_security GENSEC state, unused
+ * @param in The request, as a DATA_BLOB
+ * @return Error, INVALID_PARAMETER if it's not a packet for us
+ *                or NT_STATUS_OK if the packet is ok.
+ */
+
+NTSTATUS gensec_magic_check_krb5_oid(struct gensec_security *unused,
+					const DATA_BLOB *blob)
+{
+	if (gensec_gssapi_check_oid(blob, GENSEC_OID_KERBEROS5)) {
+		return NT_STATUS_OK;
+	} else {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+}
+
+void gensec_child_want_feature(struct gensec_security *gensec_security,
+			       uint32_t feature)
+{
+	struct gensec_security *child_security = gensec_security->child_security;
+
+	gensec_security->want_features |= feature;
+	if (child_security == NULL) {
+		return;
+	}
+	gensec_want_feature(child_security, feature);
+}
+
+bool gensec_child_have_feature(struct gensec_security *gensec_security,
+			       uint32_t feature)
+{
+	struct gensec_security *child_security = gensec_security->child_security;
+
+	if (feature & GENSEC_FEATURE_SIGN_PKT_HEADER) {
+		/*
+		 * All mechs with sub (child) mechs need to provide DCERPC
+		 * header signing! This is required because the negotiation
+		 * of header signing is done before the authentication
+		 * is completed.
+		 */
+		return true;
+	}
+
+	if (child_security == NULL) {
+		return false;
+	}
+
+	return gensec_have_feature(child_security, feature);
+}
+
+NTSTATUS gensec_child_unseal_packet(struct gensec_security *gensec_security,
+				    uint8_t *data, size_t length,
+				    const uint8_t *whole_pdu, size_t pdu_length,
+				    const DATA_BLOB *sig)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_unseal_packet(gensec_security->child_security,
+				    data, length,
+				    whole_pdu, pdu_length,
+				    sig);
+}
+
+NTSTATUS gensec_child_check_packet(struct gensec_security *gensec_security,
+				   const uint8_t *data, size_t length,
+				   const uint8_t *whole_pdu, size_t pdu_length,
+				   const DATA_BLOB *sig)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_check_packet(gensec_security->child_security,
+				   data, length,
+				   whole_pdu, pdu_length,
+				   sig);
+}
+
+NTSTATUS gensec_child_seal_packet(struct gensec_security *gensec_security,
+				  TALLOC_CTX *mem_ctx,
+				  uint8_t *data, size_t length,
+				  const uint8_t *whole_pdu, size_t pdu_length,
+				  DATA_BLOB *sig)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_seal_packet(gensec_security->child_security,
+				  mem_ctx,
+				  data, length,
+				  whole_pdu, pdu_length,
+				  sig);
+}
+
+NTSTATUS gensec_child_sign_packet(struct gensec_security *gensec_security,
+				  TALLOC_CTX *mem_ctx,
+				  const uint8_t *data, size_t length,
+				  const uint8_t *whole_pdu, size_t pdu_length,
+				  DATA_BLOB *sig)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_sign_packet(gensec_security->child_security,
+				  mem_ctx,
+				  data, length,
+				  whole_pdu, pdu_length,
+				  sig);
+}
+
+NTSTATUS gensec_child_wrap(struct gensec_security *gensec_security,
+			   TALLOC_CTX *mem_ctx,
+			   const DATA_BLOB *in,
+			   DATA_BLOB *out)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_wrap(gensec_security->child_security,
+			   mem_ctx, in, out);
+}
+
+NTSTATUS gensec_child_unwrap(struct gensec_security *gensec_security,
+			     TALLOC_CTX *mem_ctx,
+			     const DATA_BLOB *in,
+			     DATA_BLOB *out)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_unwrap(gensec_security->child_security,
+			     mem_ctx, in, out);
+}
+
+size_t gensec_child_sig_size(struct gensec_security *gensec_security,
+			     size_t data_size)
+{
+	if (gensec_security->child_security == NULL) {
+		return 0;
+	}
+
+	return gensec_sig_size(gensec_security->child_security, data_size);
+}
+
+size_t gensec_child_max_input_size(struct gensec_security *gensec_security)
+{
+	if (gensec_security->child_security == NULL) {
+		return 0;
+	}
+
+	return gensec_max_input_size(gensec_security->child_security);
+}
+
+size_t gensec_child_max_wrapped_size(struct gensec_security *gensec_security)
+{
+	if (gensec_security->child_security == NULL) {
+		return 0;
+	}
+
+	return gensec_max_wrapped_size(gensec_security->child_security);
+}
+
+NTSTATUS gensec_child_session_key(struct gensec_security *gensec_security,
+				  TALLOC_CTX *mem_ctx,
+				  DATA_BLOB *session_key)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_session_key(gensec_security->child_security,
+				  mem_ctx,
+				  session_key);
+}
+
+NTSTATUS gensec_child_session_info(struct gensec_security *gensec_security,
+				   TALLOC_CTX *mem_ctx,
+				   struct auth_session_info **session_info)
+{
+	if (gensec_security->child_security == NULL) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	return gensec_session_info(gensec_security->child_security,
+				   mem_ctx,
+				   session_info);
+}
+
+NTTIME gensec_child_expire_time(struct gensec_security *gensec_security)
+{
+	if (gensec_security->child_security == NULL) {
+		return GENSEC_EXPIRE_TIME_INFINITY;
+	}
+
+	return gensec_expire_time(gensec_security->child_security);
+}
+
+const char *gensec_child_final_auth_type(struct gensec_security *gensec_security)
+{
+	if (gensec_security->child_security == NULL) {
+		return "NONE";
+	}
+
+	return gensec_final_auth_type(gensec_security->child_security);
+}