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, 477 insertions, 0 deletions

diff --git a/source4/libcli/smb2/session.c b/source4/libcli/smb2/session.c
new file mode 100644
index 0000000..e94512d
--- /dev/null
+++ b/source4/libcli/smb2/session.c
@@ -0,0 +1,477 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   SMB2 client session handling
+
+   Copyright (C) Andrew Tridgell 2005
+   
+   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 "system/network.h"
+#include <tevent.h>
+#include "lib/util/tevent_ntstatus.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/smb2/smb2.h"
+#include "libcli/smb2/smb2_calls.h"
+#include "auth/gensec/gensec.h"
+#include "auth/credentials/credentials.h"
+#include "../libcli/smb/smbXcli_base.h"
+
+/**
+  initialise a smb2_session structure
+ */
+struct smb2_session *smb2_session_init(struct smb2_transport *transport,
+				       struct gensec_settings *settings,
+				       TALLOC_CTX *parent_ctx)
+{
+	struct smb2_session *session;
+	NTSTATUS status;
+
+	session = talloc_zero(parent_ctx, struct smb2_session);
+	if (!session) {
+		return NULL;
+	}
+	session->transport = talloc_steal(session, transport);
+
+	session->smbXcli = smbXcli_session_create(session, transport->conn);
+	if (session->smbXcli == NULL) {
+		talloc_free(session);
+		return NULL;
+	}
+
+	/* prepare a gensec context for later use */
+	status = gensec_client_start(session, &session->gensec,
+				     settings);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(session);
+		return NULL;
+	}
+
+	gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
+
+	return session;
+}
+
+/*
+ * Note: that the caller needs to keep 'transport' around as
+ *       long as the returned session is active!
+ */
+struct smb2_session *smb2_session_channel(struct smb2_transport *transport,
+					  struct gensec_settings *settings,
+					  TALLOC_CTX *parent_ctx,
+					  struct smb2_session *base_session)
+{
+	struct smb2_session *session;
+	NTSTATUS status;
+
+	session = talloc_zero(parent_ctx, struct smb2_session);
+	if (!session) {
+		return NULL;
+	}
+	session->transport = transport;
+
+	status = smb2cli_session_create_channel(session,
+						base_session->smbXcli,
+						transport->conn,
+						&session->smbXcli);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(session);
+		return NULL;
+	}
+
+	session->needs_bind = true;
+
+	/* prepare a gensec context for later use */
+	status = gensec_client_start(session, &session->gensec,
+				     settings);
+	if (!NT_STATUS_IS_OK(status)) {
+		talloc_free(session);
+		return NULL;
+	}
+
+	gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
+
+	return session;
+}
+
+struct smb2_session_setup_spnego_state {
+	struct tevent_context *ev;
+	struct smb2_session *session;
+	struct cli_credentials *credentials;
+	uint64_t previous_session_id;
+	bool session_bind;
+	bool reauth;
+	NTSTATUS gensec_status;
+	NTSTATUS remote_status;
+	DATA_BLOB in_secblob;
+	DATA_BLOB out_secblob;
+	struct iovec *recv_iov;
+};
+
+static void smb2_session_setup_spnego_gensec_next(struct tevent_req *req);
+static void smb2_session_setup_spnego_gensec_done(struct tevent_req *subreq);
+static void smb2_session_setup_spnego_smb2_next(struct tevent_req *req);
+static void smb2_session_setup_spnego_smb2_done(struct tevent_req *subreq);
+static void smb2_session_setup_spnego_both_ready(struct tevent_req *req);
+
+/*
+  a composite function that does a full SPNEGO session setup
+ */
+struct tevent_req *smb2_session_setup_spnego_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct smb2_session *session,
+				struct cli_credentials *credentials,
+				uint64_t previous_session_id)
+{
+	struct smb2_transport *transport = session->transport;
+	struct tevent_req *req;
+	struct smb2_session_setup_spnego_state *state;
+	uint64_t current_session_id;
+	const char *chosen_oid;
+	NTSTATUS status;
+	const DATA_BLOB *server_gss_blob;
+	struct timeval endtime;
+	bool ok;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smb2_session_setup_spnego_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->session = session;
+	state->credentials = credentials;
+	state->previous_session_id = previous_session_id;
+	state->gensec_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+	state->remote_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
+
+	endtime = timeval_current_ofs(transport->options.request_timeout, 0);
+
+	ok = tevent_req_set_endtime(req, ev, endtime);
+	if (!ok) {
+		return tevent_req_post(req, ev);
+	}
+
+	current_session_id = smb2cli_session_current_id(state->session->smbXcli);
+	if (state->session->needs_bind) {
+		state->session_bind = true;
+	} else if (current_session_id != 0) {
+		state->reauth = true;
+	}
+	server_gss_blob = smbXcli_conn_server_gss_blob(session->transport->conn);
+	if (server_gss_blob) {
+		state->out_secblob = *server_gss_blob;
+	}
+
+	status = gensec_set_credentials(session->gensec, credentials);
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	status = gensec_set_target_hostname(session->gensec,
+					    smbXcli_conn_remote_name(session->transport->conn));
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	status = gensec_set_target_service(session->gensec, "cifs");
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	if (state->out_secblob.length > 0) {
+		chosen_oid = GENSEC_OID_SPNEGO;
+		status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
+				  gensec_get_name_by_oid(session->gensec,
+							 chosen_oid),
+				  nt_errstr(status)));
+			state->out_secblob = data_blob_null;
+			chosen_oid = GENSEC_OID_NTLMSSP;
+			status = gensec_start_mech_by_oid(session->gensec,
+							  chosen_oid);
+			if (!NT_STATUS_IS_OK(status)) {
+				DEBUG(1, ("Failed to start set (fallback) GENSEC client mechanism %s: %s\n",
+					  gensec_get_name_by_oid(session->gensec,
+								 chosen_oid),
+					  nt_errstr(status)));
+			}
+		}
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+	} else {
+		chosen_oid = GENSEC_OID_NTLMSSP;
+		status = gensec_start_mech_by_oid(session->gensec, chosen_oid);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("Failed to start set GENSEC client mechanism %s: %s\n",
+				  gensec_get_name_by_oid(session->gensec,
+							 chosen_oid),
+				  nt_errstr(status)));
+		}
+		if (tevent_req_nterror(req, status)) {
+			return tevent_req_post(req, ev);
+		}
+	}
+
+	smb2_session_setup_spnego_gensec_next(req);
+	if (!tevent_req_is_in_progress(req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	return req;
+}
+
+static void smb2_session_setup_spnego_gensec_next(struct tevent_req *req)
+{
+	struct smb2_session_setup_spnego_state *state =
+		tevent_req_data(req,
+		struct smb2_session_setup_spnego_state);
+	struct smb2_session *session = state->session;
+	struct tevent_req *subreq = NULL;
+
+	if (NT_STATUS_IS_OK(state->gensec_status)) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	subreq = gensec_update_send(state, state->ev,
+				    session->gensec,
+				    state->out_secblob);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq,
+				smb2_session_setup_spnego_gensec_done,
+				req);
+}
+
+static void smb2_session_setup_spnego_gensec_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smb2_session_setup_spnego_state *state =
+		tevent_req_data(req,
+		struct smb2_session_setup_spnego_state);
+	NTSTATUS status;
+
+	status = gensec_update_recv(subreq, state,
+				    &state->in_secblob);
+	state->gensec_status = status;
+	state->out_secblob = data_blob_null;
+	if (!NT_STATUS_IS_OK(status) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	if (NT_STATUS_IS_OK(state->remote_status) &&
+	    NT_STATUS_IS_OK(state->gensec_status)) {
+		smb2_session_setup_spnego_both_ready(req);
+		return;
+	}
+
+	smb2_session_setup_spnego_smb2_next(req);
+}
+
+static void smb2_session_setup_spnego_smb2_next(struct tevent_req *req)
+{
+	struct smb2_session_setup_spnego_state *state =
+		tevent_req_data(req,
+		struct smb2_session_setup_spnego_state);
+	struct smb2_session *session = state->session;
+	uint32_t timeout_msec;
+	uint8_t in_flags = 0;
+	struct tevent_req *subreq = NULL;
+
+	if (NT_STATUS_IS_OK(state->remote_status)) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	timeout_msec = session->transport->options.request_timeout * 1000;
+
+	if (state->session_bind) {
+		in_flags |= SMB2_SESSION_FLAG_BINDING;
+	}
+
+	subreq = smb2cli_session_setup_send(state, state->ev,
+					    session->transport->conn,
+					    timeout_msec,
+					    session->smbXcli,
+					    in_flags,
+					    0, /* in_capabilities */
+					    0, /* in_channel */
+					    state->previous_session_id,
+					    &state->in_secblob);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq,
+				smb2_session_setup_spnego_smb2_done,
+				req);
+}
+
+/*
+  handle continuations of the spnego session setup
+*/
+static void smb2_session_setup_spnego_smb2_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct smb2_session_setup_spnego_state *state =
+		tevent_req_data(req,
+		struct smb2_session_setup_spnego_state);
+	NTSTATUS status;
+
+	status = smb2cli_session_setup_recv(subreq, state,
+					    &state->recv_iov,
+					    &state->out_secblob);
+	state->remote_status = status;
+	state->in_secblob = data_blob_null;
+	if (!NT_STATUS_IS_OK(status) &&
+	    !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		tevent_req_nterror(req, status);
+		return;
+	}
+
+	if (NT_STATUS_IS_OK(state->remote_status) &&
+	    NT_STATUS_IS_OK(state->gensec_status)) {
+		smb2_session_setup_spnego_both_ready(req);
+		return;
+	}
+
+	smb2_session_setup_spnego_gensec_next(req);
+}
+
+static void smb2_session_setup_spnego_both_ready(struct tevent_req *req)
+{
+	struct smb2_session_setup_spnego_state *state =
+		tevent_req_data(req,
+		struct smb2_session_setup_spnego_state);
+	struct smb2_session *session = state->session;
+	NTSTATUS status;
+	DATA_BLOB session_key;
+
+	if (state->out_secblob.length != 0) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	if (state->in_secblob.length != 0) {
+		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+		return;
+	}
+
+	if (state->reauth) {
+		tevent_req_done(req);
+		return;
+	}
+
+	if (cli_credentials_is_anonymous(state->credentials)) {
+		/*
+		 * Windows server does not set the
+		 * SMB2_SESSION_FLAG_IS_GUEST nor
+		 * SMB2_SESSION_FLAG_IS_NULL flag.
+		 *
+		 * This fix makes sure we do not try
+		 * to verify a signature on the final
+		 * session setup response.
+		 */
+		tevent_req_done(req);
+		return;
+	}
+
+	status = gensec_session_key(session->gensec, state,
+				    &session_key);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	if (state->session_bind) {
+		status = smb2cli_session_set_channel_key(session->smbXcli,
+							 session_key,
+							 state->recv_iov);
+		if (tevent_req_nterror(req, status)) {
+			return;
+		}
+		session->needs_bind = false;
+	} else {
+		status = smb2cli_session_set_session_key(session->smbXcli,
+							 session_key,
+							 state->recv_iov);
+		if (tevent_req_nterror(req, status)) {
+			return;
+		}
+	}
+	tevent_req_done(req);
+	return;
+}
+
+/*
+  receive a composite session setup reply
+*/
+NTSTATUS smb2_session_setup_spnego_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}
+
+/*
+  sync version of smb2_session_setup_spnego
+*/
+NTSTATUS smb2_session_setup_spnego(struct smb2_session *session, 
+				   struct cli_credentials *credentials,
+				   uint64_t previous_session_id)
+{
+	struct tevent_req *subreq;
+	NTSTATUS status;
+	bool ok;
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev = session->transport->ev;
+
+	if (frame == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	subreq = smb2_session_setup_spnego_send(frame, ev,
+						session, credentials,
+						previous_session_id);
+	if (subreq == NULL) {
+		TALLOC_FREE(frame);
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ok = tevent_req_poll(subreq, ev);
+	if (!ok) {
+		status = map_nt_error_from_unix_common(errno);
+		TALLOC_FREE(frame);
+		return status;
+	}
+
+	status = smb2_session_setup_spnego_recv(subreq);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(frame);
+		return status;
+	}
+
+	TALLOC_FREE(frame);
+	return NT_STATUS_OK;
+}