r4777: added a smb_composite_sesssetup() async composite function. This

encapsulates all the different session setup methods, including the
multi-pass spnego code.

I have hooked this into all the places that previously used the
RAW_SESSSETUP_GENERIC method, and have removed the old
RAW_SESSSETUP_GENERIC code from clisession.c and clitree.c. A nice
side effect is that these two modules are now very simple again, back
to being "raw" session setup handling, which was what was originally
intended.

I have also used this to replace the session setup code in the
smb_composite_connect() code, and used that to build a very simple
replacement for smbcli_tree_full_connection().

As a result, smbclient, smbtorture and all our other SMB connection
code now goes via these composite async functions. That should give
them a good workout!
(This used to be commit 080d0518bc7d6fd4bc3ef783e7d4d2e3275d0799)

1 files changed, 403 insertions, 0 deletions

diff --git a/source4/libcli/composite/sesssetup.c b/source4/libcli/composite/sesssetup.c
new file mode 100644
index 0000000000..062235670e
--- /dev/null
+++ b/source4/libcli/composite/sesssetup.c
@@ -0,0 +1,403 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+/*
+  a composite API for making handling a generic async session setup
+*/
+
+#include "includes.h"
+#include "libcli/raw/libcliraw.h"
+#include "libcli/composite/composite.h"
+#include "auth/auth.h"
+
+
+struct sesssetup_state {
+	union smb_sesssetup setup;
+	NTSTATUS session_key_err;
+};
+
+
+/*
+  form an encrypted lanman password from a plaintext password
+  and the server supplied challenge
+*/
+static DATA_BLOB lanman_blob(TALLOC_CTX *mem_ctx, const char *pass, DATA_BLOB challenge)
+{
+	DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
+	SMBencrypt(pass, challenge.data, blob.data);
+	return blob;
+}
+
+/*
+  form an encrypted NT password from a plaintext password
+  and the server supplied challenge
+*/
+static DATA_BLOB nt_blob(TALLOC_CTX *mem_ctx, const char *pass, DATA_BLOB challenge)
+{
+	DATA_BLOB blob = data_blob_talloc(mem_ctx, NULL, 24);
+	SMBNTencrypt(pass, challenge.data, blob.data);
+	return blob;
+}
+
+/*
+  store the user session key for a transport
+*/
+static void set_user_session_key(struct smbcli_session *session,
+				 const DATA_BLOB *session_key)
+{
+	session->user_session_key = data_blob_talloc(session, 
+						     session_key->data, 
+						     session_key->length);
+}
+
+/*
+  setup signing for a NT1 style session setup
+*/
+static void use_nt1_session_keys(struct smbcli_session *session, 
+				 const char *password, const DATA_BLOB *nt_response)
+{
+	struct smbcli_transport *transport = session->transport; 
+	uint8_t nt_hash[16];
+	DATA_BLOB session_key = data_blob_talloc(session, NULL, 16);
+
+	E_md4hash(password, nt_hash);
+	SMBsesskeygen_ntv1(nt_hash, session_key.data);
+
+	smbcli_transport_simple_set_signing(transport, session_key, *nt_response);
+
+	set_user_session_key(session, &session_key);
+	data_blob_free(&session_key);
+}
+
+
+/*
+  handler for completion of a smbcli_request sub-request
+*/
+static void request_handler(struct smbcli_request *req)
+{
+	struct smbcli_composite *c = req->async.private;
+	struct sesssetup_state *state = c->private;
+	struct smb_composite_sesssetup *io = c->composite_parms;
+	struct smbcli_session *session = req->session;
+	DATA_BLOB session_key = data_blob(NULL, 0);
+	DATA_BLOB null_data_blob = data_blob(NULL, 0);
+
+	c->status = smb_raw_session_setup_recv(req, state, &state->setup);
+
+	switch (state->setup.old.level) {
+	case RAW_SESSSETUP_OLD:
+		io->out.vuid = state->setup.old.out.vuid;
+		break;
+
+	case RAW_SESSSETUP_NT1:
+		io->out.vuid = state->setup.nt1.out.vuid;
+		break;
+
+	case RAW_SESSSETUP_SPNEGO:
+		session->vuid = io->out.vuid = state->setup.spnego.out.vuid;
+		if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) && 
+		    !NT_STATUS_IS_OK(c->status)) {
+			break;
+		}
+		c->status = gensec_update(session->gensec, state,
+					  state->setup.spnego.out.secblob,
+					  &state->setup.spnego.in.secblob);
+		if (!NT_STATUS_EQUAL(c->status, NT_STATUS_MORE_PROCESSING_REQUIRED) && 
+		    !NT_STATUS_IS_OK(c->status)) {
+			break;
+		}
+		if (state->setup.spnego.in.secblob.length == 0) {
+			break;
+		}
+
+		/* we need to do another round of session setup. We keep going until both sides
+		   are happy */
+		state->session_key_err = gensec_session_key(session->gensec, &session_key);
+		if (NT_STATUS_IS_OK(state->session_key_err)) {
+			smbcli_transport_simple_set_signing(session->transport, session_key, null_data_blob);
+		}
+
+		req = smb_raw_session_setup_send(session, &state->setup);
+		req->async.fn = request_handler;
+		req->async.private = c;
+		c->req = req;
+		return;
+	}
+
+	/* enforce the local signing required flag */
+	if (NT_STATUS_IS_OK(c->status) && io->in.user && io->in.user[0]) {
+		if (!session->transport->negotiate.sign_info.doing_signing 
+		    && session->transport->negotiate.sign_info.mandatory_signing) {
+			DEBUG(0, ("SMB signing required, but server does not support it\n"));
+			c->status = NT_STATUS_ACCESS_DENIED;
+		}
+	}
+
+	if (NT_STATUS_IS_OK(c->status)) {
+		c->state = SMBCLI_REQUEST_DONE;
+	} else {
+		c->state = SMBCLI_REQUEST_ERROR;
+	}
+	if (c->async.fn) {
+		c->async.fn(c);
+	}
+}
+
+
+/*
+  send a nt1 style session setup
+*/
+static struct smbcli_request *session_setup_nt1(struct smbcli_composite *c,
+						struct smbcli_session *session, 
+						struct smb_composite_sesssetup *io) 
+{
+	struct sesssetup_state *state = c->private;
+
+	state->setup.nt1.level           = RAW_SESSSETUP_NT1;
+	state->setup.nt1.in.bufsize      = session->transport->options.max_xmit;
+	state->setup.nt1.in.mpx_max      = session->transport->options.max_mux;
+	state->setup.nt1.in.vc_num       = 1;
+	state->setup.nt1.in.sesskey      = io->in.sesskey;
+	state->setup.nt1.in.capabilities = io->in.capabilities;
+	state->setup.nt1.in.domain       = io->in.domain;
+	state->setup.nt1.in.user         = io->in.user;
+	state->setup.nt1.in.os           = "Unix";
+	state->setup.nt1.in.lanman       = "Samba";
+
+	if (!io->in.password) {
+		state->setup.nt1.in.password1 = data_blob(NULL, 0);
+		state->setup.nt1.in.password2 = data_blob(NULL, 0);
+	} else if (session->transport->negotiate.sec_mode & 
+		   NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
+		state->setup.nt1.in.password1 = lanman_blob(state, io->in.password, 
+							    session->transport->negotiate.secblob);
+		state->setup.nt1.in.password2 = nt_blob(state, io->in.password, 
+							session->transport->negotiate.secblob);
+		use_nt1_session_keys(session, io->in.password, &state->setup.nt1.in.password2);
+	} else {
+		state->setup.nt1.in.password1 = data_blob_talloc(state, io->in.password, strlen(io->in.password));
+		state->setup.nt1.in.password2 = data_blob(NULL, 0);
+	}
+
+	return smb_raw_session_setup_send(session, &state->setup);
+}
+
+
+/*
+  old style session setup (pre NT1 protocol level)
+*/
+static struct smbcli_request *session_setup_old(struct smbcli_composite *c,
+						struct smbcli_session *session,
+						struct smb_composite_sesssetup *io)
+{
+	struct sesssetup_state *state = c->private;
+
+	state->setup.old.level      = RAW_SESSSETUP_OLD;
+	state->setup.old.in.bufsize = session->transport->options.max_xmit;
+	state->setup.old.in.mpx_max = session->transport->options.max_mux;
+	state->setup.old.in.vc_num  = 1;
+	state->setup.old.in.sesskey = io->in.sesskey;
+	state->setup.old.in.domain  = io->in.domain;
+	state->setup.old.in.user    = io->in.user;
+	state->setup.old.in.os      = "Unix";
+	state->setup.old.in.lanman  = "Samba";
+	
+	if (!io->in.password) {
+		state->setup.old.in.password = data_blob(NULL, 0);
+	} else if (session->transport->negotiate.sec_mode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) {
+		state->setup.old.in.password = lanman_blob(state, io->in.password, 
+							   session->transport->negotiate.secblob);
+	} else {
+		state->setup.old.in.password = data_blob_talloc(state,
+								io->in.password, 
+								strlen(io->in.password));
+	}
+	
+	return smb_raw_session_setup_send(session, &state->setup);
+}
+
+
+/*
+  old style session setup (pre NT1 protocol level)
+*/
+static struct smbcli_request *session_setup_spnego(struct smbcli_composite *c, 
+						   struct smbcli_session *session,
+						   struct smb_composite_sesssetup *io)
+{
+	struct sesssetup_state *state = c->private;
+	NTSTATUS status;
+	DATA_BLOB session_key = data_blob(NULL, 0);
+	DATA_BLOB null_data_blob = data_blob(NULL, 0);
+	const char *chosen_oid = NULL;
+
+	state->setup.spnego.level           = RAW_SESSSETUP_SPNEGO;
+	state->setup.spnego.in.bufsize      = session->transport->options.max_xmit;
+	state->setup.spnego.in.mpx_max      = session->transport->options.max_mux;
+	state->setup.spnego.in.vc_num       = 1;
+	state->setup.spnego.in.sesskey      = io->in.sesskey;
+	state->setup.spnego.in.capabilities = io->in.capabilities;
+	state->setup.spnego.in.domain       = io->in.domain;
+	state->setup.spnego.in.os           = "Unix";
+	state->setup.spnego.in.lanman       = "Samba";
+	state->setup.spnego.out.vuid        = session->vuid;
+
+	smbcli_temp_set_signing(session->transport);
+
+	status = gensec_client_start(session, &session->gensec);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Failed to start GENSEC client mode: %s\n", nt_errstr(status)));
+		return NULL;
+	}
+
+	gensec_want_feature(session->gensec, GENSEC_FEATURE_SESSION_KEY);
+
+	status = gensec_set_domain(session->gensec, io->in.domain);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Failed to start set GENSEC client domain to %s: %s\n", 
+			  io->in.domain, nt_errstr(status)));
+		return NULL;
+	}
+
+	status = gensec_set_username(session->gensec, io->in.user);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Failed to start set GENSEC client username to %s: %s\n", 
+			  io->in.user, nt_errstr(status)));
+		return NULL;
+	}
+
+	status = gensec_set_password(session->gensec, io->in.password);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Failed to start set GENSEC client password: %s\n", 
+			  nt_errstr(status)));
+		return NULL;
+	}
+
+	status = gensec_set_target_hostname(session->gensec, session->transport->socket->hostname);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("Failed to start set GENSEC target hostname: %s\n", 
+			  nt_errstr(status)));
+		return NULL;
+	}
+
+	if (session->transport->negotiate.secblob.length) {
+		chosen_oid = GENSEC_OID_SPNEGO;
+	} else {
+		/* without a sec blob, means raw NTLMSSP */
+		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 SPNEGO mechanism %s: %s\n",
+			  gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
+		return NULL;
+	}
+	
+	status = gensec_update(session->gensec, state,
+			       session->transport->negotiate.secblob,
+			       &state->setup.spnego.in.secblob);
+	if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		DEBUG(1, ("Failed initial gensec_update with mechanism %s: %s\n",
+			  gensec_get_name_by_oid(chosen_oid), nt_errstr(status)));
+		return NULL;
+	}
+
+	state->session_key_err = gensec_session_key(session->gensec, &session_key);
+	if (NT_STATUS_IS_OK(state->session_key_err)) {
+		smbcli_transport_simple_set_signing(session->transport, session_key, null_data_blob);
+	}
+
+	return smb_raw_session_setup_send(session, &state->setup);
+}
+
+
+/*
+  composite session setup function that hides the details of all the
+  different session setup varients, including the multi-pass nature of
+  the spnego varient
+*/
+struct smbcli_composite *smb_composite_sesssetup_send(struct smbcli_session *session, 
+						      struct smb_composite_sesssetup *io)
+{
+	struct smbcli_composite *c;
+	struct sesssetup_state *state;
+	struct smbcli_request *req = NULL;
+
+	c = talloc_zero(session, struct smbcli_composite);
+	if (c == NULL) goto failed;
+
+	state = talloc(c, struct sesssetup_state);
+	if (state == NULL) goto failed;
+
+	c->state = SMBCLI_REQUEST_SEND;
+	c->req_parms = io;
+	c->private = state;
+	c->event_ctx = session->transport->socket->event.ctx;
+	c->composite_parms = io;
+
+	/* no session setup at all in earliest protocol varients */
+	if (session->transport->negotiate.protocol < PROTOCOL_LANMAN1) {
+		ZERO_STRUCT(io->out);
+		c->state = SMBCLI_REQUEST_DONE;
+		return c;
+	}
+
+	/* see what session setup interface we will use */
+	if (session->transport->negotiate.protocol < PROTOCOL_NT1) {
+		req = session_setup_old(c, session, io);
+	} else if (!session->transport->options.use_spnego ||
+		   !(io->in.capabilities & CAP_EXTENDED_SECURITY)) {
+		req = session_setup_nt1(c, session, io);
+	} else {
+		req = session_setup_spnego(c, session, io);
+	}
+
+	if (req == NULL) goto failed;
+
+	req->async.fn = request_handler;
+	req->async.private = c;
+	c->req = req;
+
+	return c;
+
+failed:
+	talloc_free(c);
+	return NULL;
+}
+
+
+/*
+  receive a composite session setup reply
+*/
+NTSTATUS smb_composite_sesssetup_recv(struct smbcli_composite *c)
+{
+	NTSTATUS status;
+	status = smb_composite_wait(c);
+	talloc_free(c);
+	return status;
+}
+
+/*
+  sync version of smb_composite_sesssetup 
+*/
+NTSTATUS smb_composite_sesssetup(struct smbcli_session *session, struct smb_composite_sesssetup *io)
+{
+	struct smbcli_composite *c = smb_composite_sesssetup_send(session, io);
+	return smb_composite_sesssetup_recv(c);
+}