Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

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

1 files changed, 1160 insertions, 0 deletions

diff --git a/auth/ntlmssp/ntlmssp_server.c b/auth/ntlmssp/ntlmssp_server.c
new file mode 100644
index 0000000..64b9628
--- /dev/null
+++ b/auth/ntlmssp/ntlmssp_server.c
@@ -0,0 +1,1160 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   handle NTLMSSP, server side
+
+   Copyright (C) Andrew Tridgell      2001
+   Copyright (C) Andrew Bartlett 2001-2010
+
+   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 <tevent.h>
+#include "lib/util/tevent_ntstatus.h"
+#include "lib/util/time_basic.h"
+#include "auth/ntlmssp/ntlmssp.h"
+#include "auth/ntlmssp/ntlmssp_private.h"
+#include "../librpc/gen_ndr/ndr_ntlmssp.h"
+#include "auth/ntlmssp/ntlmssp_ndr.h"
+#include "../libcli/auth/libcli_auth.h"
+#include "auth/gensec/gensec.h"
+#include "auth/gensec/gensec_internal.h"
+#include "auth/common_auth.h"
+#include "param/param.h"
+#include "param/loadparm.h"
+#include "libcli/security/session.h"
+
+#include "lib/crypto/gnutls_helpers.h"
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+/**
+ * Determine correct target name flags for reply, given server role
+ * and negotiated flags
+ *
+ * @param ntlmssp_state NTLMSSP State
+ * @param neg_flags The flags from the packet
+ * @param chal_flags The flags to be set in the reply packet
+ * @return The 'target name' string.
+ */
+
+const char *ntlmssp_target_name(struct ntlmssp_state *ntlmssp_state,
+				uint32_t neg_flags, uint32_t *chal_flags)
+{
+	if (neg_flags & NTLMSSP_REQUEST_TARGET) {
+		*chal_flags |= NTLMSSP_NEGOTIATE_TARGET_INFO;
+		*chal_flags |= NTLMSSP_REQUEST_TARGET;
+		if (ntlmssp_state->server.is_standalone) {
+			*chal_flags |= NTLMSSP_TARGET_TYPE_SERVER;
+			return ntlmssp_state->server.netbios_name;
+		} else {
+			*chal_flags |= NTLMSSP_TARGET_TYPE_DOMAIN;
+			return ntlmssp_state->server.netbios_domain;
+		};
+	} else {
+		return "";
+	}
+}
+
+/**
+ * Next state function for the NTLMSSP Negotiate packet
+ *
+ * @param gensec_security GENSEC state
+ * @param out_mem_ctx Memory context for *out
+ * @param in The request, as a DATA_BLOB.  reply.data must be NULL
+ * @param out The reply, as an allocated DATA_BLOB, caller to free.
+ * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
+ */
+
+NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
+					 TALLOC_CTX *out_mem_ctx,
+					 const DATA_BLOB request, DATA_BLOB *reply)
+{
+	struct gensec_ntlmssp_context *gensec_ntlmssp =
+		talloc_get_type_abort(gensec_security->private_data,
+				      struct gensec_ntlmssp_context);
+	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+	struct auth4_context *auth_context = gensec_security->auth_context;
+	DATA_BLOB struct_blob;
+	uint32_t neg_flags = 0;
+	uint32_t ntlmssp_command, chal_flags;
+	uint8_t cryptkey[8];
+	const char *target_name;
+	NTSTATUS status;
+	struct timeval tv_now = timeval_current();
+	/*
+	 * See [MS-NLMP]
+	 *
+	 * Windows NT 4.0, windows_2000: use 30 minutes,
+	 * Windows XP, Windows Server 2003, Windows Vista,
+	 * Windows Server 2008, Windows 7, and Windows Server 2008 R2
+	 * use 36 hours.
+	 *
+	 * Newer systems doesn't check this, likely because the
+	 * connectionless NTLMSSP is no longer supported.
+	 *
+	 * As we expect the AUTHENTICATION_MESSAGE to arrive
+	 * directly after the NEGOTIATE_MESSAGE (typically less than
+	 * as 1 second later). We use a hard timeout of 30 Minutes.
+	 *
+	 * We don't look at AUTHENTICATE_MESSAGE.NtChallengeResponse.TimeStamp
+	 * instead we just remember our own time.
+	 */
+	uint32_t max_lifetime = 30 * 60;
+	struct timeval tv_end = timeval_add(&tv_now, max_lifetime, 0);
+
+	/* parse the NTLMSSP packet */
+#if 0
+	file_save("ntlmssp_negotiate.dat", request.data, request.length);
+#endif
+
+	if (request.length) {
+		if (request.length > UINT16_MAX) {
+			DEBUG(1, ("ntlmssp_server_negotiate: reject large request of length %u\n",
+				(unsigned int)request.length));
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		if ((request.length < 16) || !msrpc_parse(ntlmssp_state, &request, "Cdd",
+							  "NTLMSSP",
+							  &ntlmssp_command,
+							  &neg_flags)) {
+			DEBUG(1, ("ntlmssp_server_negotiate: failed to parse NTLMSSP Negotiate of length %u\n",
+				(unsigned int)request.length));
+			dump_data(2, request.data, request.length);
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		debug_ntlmssp_flags(neg_flags);
+
+		if (DEBUGLEVEL >= 10) {
+			struct NEGOTIATE_MESSAGE *negotiate = talloc(
+				ntlmssp_state, struct NEGOTIATE_MESSAGE);
+			if (negotiate != NULL) {
+				status = ntlmssp_pull_NEGOTIATE_MESSAGE(
+					&request, negotiate, negotiate);
+				if (NT_STATUS_IS_OK(status)) {
+					NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
+							negotiate);
+				}
+				TALLOC_FREE(negotiate);
+			}
+		}
+	}
+
+	status = ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, "negotiate");
+	if (!NT_STATUS_IS_OK(status)){
+		return status;
+	}
+
+	/* Ask our caller what challenge they would like in the packet */
+	if (auth_context->get_ntlm_challenge) {
+		status = auth_context->get_ntlm_challenge(auth_context, cryptkey);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
+				  nt_errstr(status)));
+			return status;
+		}
+	} else {
+		DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't give a challenge\n"));
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+
+	/* The flags we send back are not just the negotiated flags,
+	 * they are also 'what is in this packet'.  Therefore, we
+	 * operate on 'chal_flags' from here on
+	 */
+
+	chal_flags = ntlmssp_state->neg_flags;
+	ntlmssp_state->server.challenge_endtime = timeval_to_nttime(&tv_end);
+
+	/* get the right name to fill in as 'target' */
+	target_name = ntlmssp_target_name(ntlmssp_state,
+					  neg_flags, &chal_flags);
+	if (target_name == NULL)
+		return NT_STATUS_INVALID_PARAMETER;
+
+	ntlmssp_state->chal = data_blob_talloc(ntlmssp_state, cryptkey, 8);
+	ntlmssp_state->internal_chal = data_blob_talloc(ntlmssp_state,
+							cryptkey, 8);
+
+	/* This creates the 'blob' of names that appears at the end of the packet */
+	if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
+		enum ndr_err_code err;
+		struct AV_PAIR *pairs = NULL;
+		uint32_t count = 5;
+
+		pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR, count + 1);
+		if (pairs == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+
+		pairs[0].AvId			= MsvAvNbDomainName;
+		pairs[0].Value.AvNbDomainName	= target_name;
+
+		pairs[1].AvId			= MsvAvNbComputerName;
+		pairs[1].Value.AvNbComputerName	= ntlmssp_state->server.netbios_name;
+
+		pairs[2].AvId			= MsvAvDnsDomainName;
+		pairs[2].Value.AvDnsDomainName	= ntlmssp_state->server.dns_domain;
+
+		pairs[3].AvId			= MsvAvDnsComputerName;
+		pairs[3].Value.AvDnsComputerName= ntlmssp_state->server.dns_name;
+
+		if (!ntlmssp_state->force_old_spnego) {
+			pairs[4].AvId			= MsvAvTimestamp;
+			pairs[4].Value.AvTimestamp	=
+						timeval_to_nttime(&tv_now);
+			count += 1;
+
+			pairs[5].AvId			= MsvAvEOL;
+		} else {
+			pairs[4].AvId			= MsvAvEOL;
+		}
+
+		ntlmssp_state->server.av_pair_list.count = count;
+		ntlmssp_state->server.av_pair_list.pair = pairs;
+
+		err = ndr_push_struct_blob(&struct_blob,
+					ntlmssp_state,
+					&ntlmssp_state->server.av_pair_list,
+					(ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST);
+		if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
+			return NT_STATUS_NO_MEMORY;
+		}
+	} else {
+		struct_blob = data_blob_null;
+	}
+
+	{
+		/* Marshal the packet in the right format, be it unicode or ASCII */
+		const char *gen_string;
+		const DATA_BLOB version_blob = ntlmssp_version_blob();
+
+		if (ntlmssp_state->unicode) {
+			gen_string = "CdUdbddBb";
+		} else {
+			gen_string = "CdAdbddBb";
+		}
+
+		status = msrpc_gen(out_mem_ctx, reply, gen_string,
+			"NTLMSSP",
+			NTLMSSP_CHALLENGE,
+			target_name,
+			chal_flags,
+			cryptkey, 8,
+			0, 0,
+			struct_blob.data, struct_blob.length,
+			version_blob.data, version_blob.length);
+
+		if (!NT_STATUS_IS_OK(status)) {
+			data_blob_free(&struct_blob);
+			return status;
+		}
+
+		if (DEBUGLEVEL >= 10) {
+			struct CHALLENGE_MESSAGE *challenge = talloc(
+				ntlmssp_state, struct CHALLENGE_MESSAGE);
+			if (challenge != NULL) {
+				challenge->NegotiateFlags = chal_flags;
+				status = ntlmssp_pull_CHALLENGE_MESSAGE(
+					reply, challenge, challenge);
+				if (NT_STATUS_IS_OK(status)) {
+					NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
+							challenge);
+				}
+				TALLOC_FREE(challenge);
+			}
+		}
+	}
+
+	data_blob_free(&struct_blob);
+
+	ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
+							     request);
+	if (ntlmssp_state->negotiate_blob.length != request.length) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ntlmssp_state->challenge_blob = data_blob_dup_talloc(ntlmssp_state,
+							     *reply);
+	if (ntlmssp_state->challenge_blob.length != reply->length) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	ntlmssp_state->expected_state = NTLMSSP_AUTH;
+
+	return NT_STATUS_MORE_PROCESSING_REQUIRED;
+}
+
+struct ntlmssp_server_auth_state {
+	struct gensec_security *gensec_security;
+	struct gensec_ntlmssp_context *gensec_ntlmssp;
+	DATA_BLOB in;
+	struct auth_usersupplied_info *user_info;
+	DATA_BLOB user_session_key;
+	DATA_BLOB lm_session_key;
+	/* internal variables used by KEY_EXCH (client-supplied user session key */
+	DATA_BLOB encrypted_session_key;
+	bool doing_ntlm2;
+	/* internal variables used by NTLM2 */
+	uint8_t session_nonce[16];
+};
+
+static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
+				       struct gensec_ntlmssp_context *gensec_ntlmssp,
+				       struct ntlmssp_server_auth_state *state,
+				       const DATA_BLOB request);
+static void ntlmssp_server_auth_done(struct tevent_req *subreq);
+static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
+					struct gensec_ntlmssp_context *gensec_ntlmssp,
+					struct ntlmssp_server_auth_state *state,
+					DATA_BLOB request);
+
+struct tevent_req *ntlmssp_server_auth_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct gensec_security *gensec_security,
+					    const DATA_BLOB in)
+{
+	struct gensec_ntlmssp_context *gensec_ntlmssp =
+		talloc_get_type_abort(gensec_security->private_data,
+				      struct gensec_ntlmssp_context);
+	struct auth4_context *auth_context = gensec_security->auth_context;
+	struct tevent_req *req = NULL;
+	struct tevent_req *subreq = NULL;
+	struct ntlmssp_server_auth_state *state = NULL;
+	NTSTATUS status;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ntlmssp_server_auth_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->gensec_security = gensec_security;
+	state->gensec_ntlmssp = gensec_ntlmssp;
+	state->in = in;
+
+	status = ntlmssp_server_preauth(gensec_security,
+					gensec_ntlmssp,
+					state, in);
+	if (tevent_req_nterror(req, status)) {
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = auth_context->check_ntlm_password_send(
+		state, ev, auth_context, state->user_info);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq,	ntlmssp_server_auth_done, req);
+	return req;
+}
+
+/**
+ * Next state function for the Authenticate packet
+ *
+ * @param ntlmssp_state NTLMSSP State
+ * @param request The request, as a DATA_BLOB
+ * @return Errors or NT_STATUS_OK.
+ */
+
+static NTSTATUS ntlmssp_server_preauth(struct gensec_security *gensec_security,
+				       struct gensec_ntlmssp_context *gensec_ntlmssp,
+				       struct ntlmssp_server_auth_state *state,
+				       const DATA_BLOB request)
+{
+	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+	struct auth4_context *auth_context = gensec_security->auth_context;
+	struct auth_usersupplied_info *user_info = NULL;
+	uint32_t ntlmssp_command, auth_flags;
+	NTSTATUS nt_status;
+	const unsigned int version_len = 8;
+	DATA_BLOB version_blob = data_blob_null;
+	const unsigned int mic_len = NTLMSSP_MIC_SIZE;
+	DATA_BLOB mic_blob = data_blob_null;
+	const char *parse_string;
+	bool ok;
+	struct timeval endtime;
+	bool expired = false;
+
+#if 0
+	file_save("ntlmssp_auth.dat", request.data, request.length);
+#endif
+
+	if (ntlmssp_state->unicode) {
+		parse_string = "CdBBUUUBdbb";
+	} else {
+		parse_string = "CdBBAAABdbb";
+	}
+
+	/* zero these out */
+	data_blob_free(&ntlmssp_state->session_key);
+	data_blob_free(&ntlmssp_state->lm_resp);
+	data_blob_free(&ntlmssp_state->nt_resp);
+
+	ntlmssp_state->user = NULL;
+	ntlmssp_state->domain = NULL;
+	ntlmssp_state->client.netbios_name = NULL;
+
+	/* now the NTLMSSP encoded auth hashes */
+	ok = msrpc_parse(ntlmssp_state, &request, parse_string,
+			 "NTLMSSP",
+			 &ntlmssp_command,
+			 &ntlmssp_state->lm_resp,
+			 &ntlmssp_state->nt_resp,
+			 &ntlmssp_state->domain,
+			 &ntlmssp_state->user,
+			 &ntlmssp_state->client.netbios_name,
+			 &state->encrypted_session_key,
+			 &auth_flags,
+			 &version_blob, version_len,
+			 &mic_blob, mic_len);
+	if (!ok) {
+		DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
+		dump_data(10, request.data, request.length);
+
+		data_blob_free(&version_blob);
+		data_blob_free(&mic_blob);
+
+		if (ntlmssp_state->unicode) {
+			parse_string = "CdBBUUUBd";
+		} else {
+			parse_string = "CdBBAAABd";
+		}
+
+		ok = msrpc_parse(ntlmssp_state, &request, parse_string,
+				 "NTLMSSP",
+				 &ntlmssp_command,
+				 &ntlmssp_state->lm_resp,
+				 &ntlmssp_state->nt_resp,
+				 &ntlmssp_state->domain,
+				 &ntlmssp_state->user,
+				 &ntlmssp_state->client.netbios_name,
+				 &state->encrypted_session_key,
+				 &auth_flags);
+	}
+
+	if (!ok) {
+		DEBUG(10, ("ntlmssp_server_auth: failed to parse NTLMSSP (nonfatal):\n"));
+		dump_data(10, request.data, request.length);
+
+		/* zero this out */
+		data_blob_free(&state->encrypted_session_key);
+		auth_flags = 0;
+
+		/* Try again with a shorter string (Win9X truncates this packet) */
+		if (ntlmssp_state->unicode) {
+			parse_string = "CdBBUUU";
+		} else {
+			parse_string = "CdBBAAA";
+		}
+
+		/* now the NTLMSSP encoded auth hashes */
+		if (!msrpc_parse(ntlmssp_state, &request, parse_string,
+				 "NTLMSSP",
+				 &ntlmssp_command,
+				 &ntlmssp_state->lm_resp,
+				 &ntlmssp_state->nt_resp,
+				 &ntlmssp_state->domain,
+				 &ntlmssp_state->user,
+				 &ntlmssp_state->client.netbios_name)) {
+			DEBUG(1, ("ntlmssp_server_auth: failed to parse NTLMSSP (tried both formats):\n"));
+			dump_data(2, request.data, request.length);
+
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+	}
+
+	talloc_steal(state, state->encrypted_session_key.data);
+
+	if (auth_flags != 0) {
+		nt_status = ntlmssp_handle_neg_flags(ntlmssp_state,
+						     auth_flags,
+						     "authenticate");
+		if (!NT_STATUS_IS_OK(nt_status)){
+			return nt_status;
+		}
+	}
+
+	if (DEBUGLEVEL >= 10) {
+		struct AUTHENTICATE_MESSAGE *authenticate = talloc(
+			ntlmssp_state, struct AUTHENTICATE_MESSAGE);
+		if (authenticate != NULL) {
+			NTSTATUS status;
+			authenticate->NegotiateFlags = auth_flags;
+			status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
+				&request, authenticate, authenticate);
+			if (NT_STATUS_IS_OK(status)) {
+				NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
+						authenticate);
+			}
+			TALLOC_FREE(authenticate);
+		}
+	}
+
+	DEBUG(3,("Got user=[%s] domain=[%s] workstation=[%s] len1=%lu len2=%lu\n",
+		 ntlmssp_state->user, ntlmssp_state->domain,
+		 ntlmssp_state->client.netbios_name,
+		 (unsigned long)ntlmssp_state->lm_resp.length,
+		 (unsigned long)ntlmssp_state->nt_resp.length));
+
+#if 0
+	file_save("nthash1.dat",  &ntlmssp_state->nt_resp.data,  &ntlmssp_state->nt_resp.length);
+	file_save("lmhash1.dat",  &ntlmssp_state->lm_resp.data,  &ntlmssp_state->lm_resp.length);
+#endif
+
+	if (ntlmssp_state->nt_resp.length > 24) {
+		struct NTLMv2_RESPONSE v2_resp;
+		enum ndr_err_code err;
+		uint32_t i = 0;
+		uint32_t count = 0;
+		const struct AV_PAIR *flags = NULL;
+		const struct AV_PAIR *eol = NULL;
+		uint32_t av_flags = 0;
+
+		err = ndr_pull_struct_blob(&ntlmssp_state->nt_resp,
+					ntlmssp_state,
+					&v2_resp,
+					(ndr_pull_flags_fn_t)ndr_pull_NTLMv2_RESPONSE);
+		if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
+			nt_status = ndr_map_error2ntstatus(err);
+			if (NT_STATUS_EQUAL(nt_status, NT_STATUS_BUFFER_TOO_SMALL)) {
+				/*
+				 * Note that invalid blobs should result in
+				 * INVALID_PARAMETER, as demonstrated by
+				 * smb2.session.ntlmssp_bug14932
+				 */
+				nt_status = NT_STATUS_INVALID_PARAMETER;
+			}
+			DEBUG(1,("%s: failed to parse NTLMv2_RESPONSE of length %zu for "
+				 "user=[%s] domain=[%s] workstation=[%s] - %s %s\n",
+				 __func__, ntlmssp_state->nt_resp.length,
+				 ntlmssp_state->user, ntlmssp_state->domain,
+				 ntlmssp_state->client.netbios_name,
+				 ndr_errstr(err), nt_errstr(nt_status)));
+			return nt_status;
+		}
+
+		if (DEBUGLVL(10)) {
+			NDR_PRINT_DEBUG(NTLMv2_RESPONSE, &v2_resp);
+		}
+
+		eol = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
+					  MsvAvEOL);
+		if (eol == NULL) {
+			DEBUG(1,("%s: missing MsvAvEOL for "
+				 "user=[%s] domain=[%s] workstation=[%s]\n",
+				 __func__, ntlmssp_state->user, ntlmssp_state->domain,
+				 ntlmssp_state->client.netbios_name));
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		flags = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
+					    MsvAvFlags);
+		if (flags != NULL) {
+			av_flags = flags->Value.AvFlags;
+		}
+
+		if (av_flags & NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE) {
+			if (mic_blob.length != NTLMSSP_MIC_SIZE) {
+				DEBUG(1,("%s: mic_blob.length[%u] for "
+					 "user=[%s] domain=[%s] workstation=[%s]\n",
+					 __func__,
+					 (unsigned)mic_blob.length,
+					 ntlmssp_state->user,
+					 ntlmssp_state->domain,
+					 ntlmssp_state->client.netbios_name));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+
+			if (request.length <
+			    (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE))
+			{
+				DEBUG(1,("%s: missing MIC "
+					 "request.length[%u] for "
+					 "user=[%s] domain=[%s] workstation=[%s]\n",
+					 __func__,
+					 (unsigned)request.length,
+					 ntlmssp_state->user,
+					 ntlmssp_state->domain,
+					 ntlmssp_state->client.netbios_name));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+
+			ntlmssp_state->new_spnego = true;
+		}
+
+		count = ntlmssp_state->server.av_pair_list.count;
+		if (v2_resp.Challenge.AvPairs.count < count) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		for (i = 0; i < count; i++) {
+			const struct AV_PAIR *sp =
+				&ntlmssp_state->server.av_pair_list.pair[i];
+			const struct AV_PAIR *cp = NULL;
+
+			if (sp->AvId == MsvAvEOL) {
+				continue;
+			}
+
+			cp = ndr_ntlmssp_find_av(&v2_resp.Challenge.AvPairs,
+						 sp->AvId);
+			if (cp == NULL) {
+				DEBUG(1,("%s: AvId 0x%x missing for"
+					 "user=[%s] domain=[%s] "
+					 "workstation=[%s]\n",
+					 __func__,
+					 (unsigned)sp->AvId,
+					 ntlmssp_state->user,
+					 ntlmssp_state->domain,
+					 ntlmssp_state->client.netbios_name));
+				return NT_STATUS_INVALID_PARAMETER;
+			}
+
+			switch (cp->AvId) {
+#define CASE_STRING(v) case Msv ## v: do { \
+	int cmp; \
+	if (sp->Value.v == NULL) { \
+		return NT_STATUS_INTERNAL_ERROR; \
+	} \
+	if (cp->Value.v == NULL) { \
+		DEBUG(1,("%s: invalid %s " \
+			 "got[%s] expect[%s] for " \
+			 "user=[%s] domain=[%s] workstation=[%s]\n", \
+			 __func__, #v, \
+			 cp->Value.v, \
+			 sp->Value.v, \
+			 ntlmssp_state->user, \
+			 ntlmssp_state->domain, \
+			 ntlmssp_state->client.netbios_name)); \
+		return NT_STATUS_INVALID_PARAMETER; \
+	} \
+	cmp = strcmp(cp->Value.v, sp->Value.v); \
+	if (cmp != 0) { \
+		DEBUG(1,("%s: invalid %s " \
+			 "got[%s] expect[%s] for " \
+			 "user=[%s] domain=[%s] workstation=[%s]\n", \
+			 __func__, #v, \
+			 cp->Value.v, \
+			 sp->Value.v, \
+			 ntlmssp_state->user, \
+			 ntlmssp_state->domain, \
+			 ntlmssp_state->client.netbios_name)); \
+		return NT_STATUS_INVALID_PARAMETER; \
+	} \
+} while(0); break
+			CASE_STRING(AvNbComputerName);
+			CASE_STRING(AvNbDomainName);
+			CASE_STRING(AvDnsComputerName);
+			CASE_STRING(AvDnsDomainName);
+			CASE_STRING(AvDnsTreeName);
+			case MsvAvTimestamp:
+				if (cp->Value.AvTimestamp != sp->Value.AvTimestamp) {
+					struct timeval ct;
+					struct timeval st;
+					struct timeval_buf tmp1;
+					struct timeval_buf tmp2;
+
+					nttime_to_timeval(&ct,
+							  cp->Value.AvTimestamp);
+					nttime_to_timeval(&st,
+							  sp->Value.AvTimestamp);
+
+					DEBUG(1,("%s: invalid AvTimestamp "
+						 "got[%s] expect[%s] for "
+						 "user=[%s] domain=[%s] "
+						 "workstation=[%s]\n",
+						 __func__,
+						 timeval_str_buf(&ct, false,
+								 true, &tmp1),
+						 timeval_str_buf(&st, false,
+								 true, &tmp2),
+						 ntlmssp_state->user,
+						 ntlmssp_state->domain,
+						 ntlmssp_state->client.netbios_name));
+					return NT_STATUS_INVALID_PARAMETER;
+				}
+				break;
+			default:
+				/*
+				 * This can't happen as we control
+				 * ntlmssp_state->server.av_pair_list
+				 */
+				return NT_STATUS_INTERNAL_ERROR;
+			}
+		}
+	}
+
+	nttime_to_timeval(&endtime, ntlmssp_state->server.challenge_endtime);
+	expired = timeval_expired(&endtime);
+	if (expired) {
+		struct timeval_buf tmp;
+		DEBUG(1,("%s: challenge invalid (expired %s) for "
+			 "user=[%s] domain=[%s] workstation=[%s]\n",
+			 __func__,
+			 timeval_str_buf(&endtime, false, true, &tmp),
+			 ntlmssp_state->user, ntlmssp_state->domain,
+			 ntlmssp_state->client.netbios_name));
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	/* NTLM2 uses a 'challenge' that is made of up both the server challenge, and a
+	   client challenge
+
+	   However, the NTLM2 flag may still be set for the real NTLMv2 logins, be careful.
+	*/
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
+		if (ntlmssp_state->nt_resp.length == 24 && ntlmssp_state->lm_resp.length == 24) {
+			state->doing_ntlm2 = true;
+
+			memcpy(state->session_nonce, ntlmssp_state->internal_chal.data, 8);
+			memcpy(&state->session_nonce[8], ntlmssp_state->lm_resp.data, 8);
+
+			SMB_ASSERT(ntlmssp_state->internal_chal.data && ntlmssp_state->internal_chal.length == 8);
+
+			/* LM response is no longer useful */
+			data_blob_free(&ntlmssp_state->lm_resp);
+
+			/* We changed the effective challenge - set it */
+			if (auth_context->set_ntlm_challenge) {
+				uint8_t session_nonce_hash[16];
+				int rc;
+
+				rc = gnutls_hash_fast(GNUTLS_DIG_MD5,
+						      state->session_nonce,
+						      16,
+						      session_nonce_hash);
+				if (rc < 0) {
+					return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+				}
+
+
+				nt_status = auth_context->set_ntlm_challenge(auth_context,
+									     session_nonce_hash,
+									     "NTLMSSP callback (NTLM2)");
+				ZERO_ARRAY(session_nonce_hash);
+				if (!NT_STATUS_IS_OK(nt_status)) {
+					DEBUG(1, ("gensec_ntlmssp_server_negotiate: failed to get challenge: %s\n",
+						  nt_errstr(nt_status)));
+					return nt_status;
+				}
+			} else {
+				DEBUG(1, ("gensec_ntlmssp_server_negotiate: backend doesn't have facility for challenge to be set\n"));
+
+				return NT_STATUS_NOT_IMPLEMENTED;
+			}
+
+			/* LM Key is incompatible. */
+			ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+		}
+	}
+
+	user_info = talloc_zero(state, struct auth_usersupplied_info);
+	if (!user_info) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
+	user_info->flags = 0;
+	user_info->client.account_name = ntlmssp_state->user;
+	user_info->client.domain_name = ntlmssp_state->domain;
+	user_info->workstation_name = ntlmssp_state->client.netbios_name;
+	user_info->remote_host = gensec_get_remote_address(gensec_security);
+	user_info->local_host = gensec_get_local_address(gensec_security);
+	user_info->service_description
+		= gensec_get_target_service_description(gensec_security);
+
+	/*
+	 * This will just be the string "NTLMSSP" from
+	 * gensec_ntlmssp_final_auth_type, but ensures it stays in sync
+	 * with the same use in the authorization logging triggered by
+	 * gensec_session_info() later
+	 */
+	user_info->auth_description = gensec_final_auth_type(gensec_security);
+
+	user_info->password_state = AUTH_PASSWORD_RESPONSE;
+	user_info->password.response.lanman = ntlmssp_state->lm_resp;
+	user_info->password.response.nt = ntlmssp_state->nt_resp;
+
+	state->user_info = user_info;
+	return NT_STATUS_OK;
+}
+
+static void ntlmssp_server_auth_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	struct ntlmssp_server_auth_state *state =
+		tevent_req_data(req,
+		struct ntlmssp_server_auth_state);
+	struct gensec_security *gensec_security = state->gensec_security;
+	struct gensec_ntlmssp_context *gensec_ntlmssp = state->gensec_ntlmssp;
+	struct auth4_context *auth_context = gensec_security->auth_context;
+	uint8_t authoritative = 1;
+	NTSTATUS status;
+
+	status = auth_context->check_ntlm_password_recv(subreq,
+						gensec_ntlmssp,
+						&authoritative,
+						&gensec_ntlmssp->server_returned_info,
+						&state->user_session_key,
+						&state->lm_session_key);
+	TALLOC_FREE(subreq);
+	if (!NT_STATUS_IS_OK(status)) {
+		DBG_INFO("Checking NTLMSSP password for %s\\%s failed: %s\n",
+			 state->user_info->client.domain_name,
+			 state->user_info->client.account_name,
+			 nt_errstr(status));
+	}
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+	talloc_steal(state, state->user_session_key.data);
+	talloc_steal(state, state->lm_session_key.data);
+
+	status = ntlmssp_server_postauth(state->gensec_security,
+					 state->gensec_ntlmssp,
+					 state, state->in);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+/**
+ * Next state function for the Authenticate packet
+ * (after authentication - figures out the session keys etc)
+ *
+ * @param ntlmssp_state NTLMSSP State
+ * @return Errors or NT_STATUS_OK.
+ */
+
+static NTSTATUS ntlmssp_server_postauth(struct gensec_security *gensec_security,
+					struct gensec_ntlmssp_context *gensec_ntlmssp,
+					struct ntlmssp_server_auth_state *state,
+					DATA_BLOB request)
+{
+	struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
+	struct auth4_context *auth_context = gensec_security->auth_context;
+	DATA_BLOB user_session_key = state->user_session_key;
+	DATA_BLOB lm_session_key = state->lm_session_key;
+	NTSTATUS nt_status = NT_STATUS_OK;
+	DATA_BLOB session_key = data_blob(NULL, 0);
+	struct auth_session_info *session_info = NULL;
+
+	TALLOC_FREE(state->user_info);
+
+	if (lpcfg_map_to_guest(gensec_security->settings->lp_ctx) != NEVER_MAP_TO_GUEST
+	    && auth_context->generate_session_info != NULL)
+	{
+		NTSTATUS tmp_status;
+
+		/*
+		 * We need to check if the auth is anonymous or mapped to guest
+		 */
+		tmp_status = auth_context->generate_session_info(auth_context, state,
+								 gensec_ntlmssp->server_returned_info,
+								 gensec_ntlmssp->ntlmssp_state->user,
+								 AUTH_SESSION_INFO_SIMPLE_PRIVILEGES,
+								 &session_info);
+		if (!NT_STATUS_IS_OK(tmp_status)) {
+			/*
+			 * We don't care about failures,
+			 * the worst result is that we try MIC checking
+			 * for a map to guest authentication.
+			 */
+			TALLOC_FREE(session_info);
+		}
+	}
+
+	if (session_info != NULL) {
+		if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
+			/*
+			 * Anonymous and GUEST are not secure anyway.
+			 * avoid new_spnego and MIC checking.
+			 */
+			ntlmssp_state->new_spnego = false;
+			ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
+			ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
+		}
+		TALLOC_FREE(session_info);
+	}
+
+	dump_data_pw("NT session key:\n", user_session_key.data, user_session_key.length);
+	dump_data_pw("LM first-8:\n", lm_session_key.data, lm_session_key.length);
+
+	/* Handle the different session key derivation for NTLM2 */
+	if (state->doing_ntlm2) {
+		if (user_session_key.data && user_session_key.length == 16) {
+			int rc;
+
+			session_key = data_blob_talloc(ntlmssp_state,
+						       NULL, 16);
+
+			rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
+					      user_session_key.data,
+					      user_session_key.length,
+					      state->session_nonce,
+					      sizeof(state->session_nonce),
+					      session_key.data);
+			if (rc < 0) {
+				return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+			}
+
+			DEBUG(10,("ntlmssp_server_auth: Created NTLM2 session key.\n"));
+			dump_data_pw("NTLM2 session key:\n", session_key.data, session_key.length);
+
+		} else {
+			DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM2 session key.\n"));
+			session_key = data_blob_null;
+		}
+	} else if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
+		/* Ensure we can never get here on NTLMv2 */
+		&& (ntlmssp_state->nt_resp.length == 0 || ntlmssp_state->nt_resp.length == 24)) {
+
+		if (lm_session_key.data && lm_session_key.length >= 8) {
+			if (ntlmssp_state->lm_resp.data && ntlmssp_state->lm_resp.length == 24) {
+				session_key = data_blob_talloc(ntlmssp_state,
+							       NULL, 16);
+				if (session_key.data == NULL) {
+					return NT_STATUS_NO_MEMORY;
+				}
+				nt_status = SMBsesskeygen_lm_sess_key(lm_session_key.data,
+								      ntlmssp_state->lm_resp.data,
+								      session_key.data);
+				if (!NT_STATUS_IS_OK(nt_status)) {
+					return nt_status;
+				}
+				DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
+			} else {
+				static const uint8_t zeros[24] = {0, };
+				session_key = data_blob_talloc(
+					ntlmssp_state, NULL, 16);
+				if (session_key.data == NULL) {
+					return NT_STATUS_NO_MEMORY;
+				}
+				nt_status = SMBsesskeygen_lm_sess_key(zeros, zeros,
+								      session_key.data);
+				if (!NT_STATUS_IS_OK(nt_status)) {
+					return nt_status;
+				}
+				DEBUG(10,("ntlmssp_server_auth: Created NTLM session key.\n"));
+			}
+			dump_data_pw("LM session key:\n", session_key.data,
+				     session_key.length);
+		} else {
+			/* LM Key not selected */
+			ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
+			DEBUG(10,("ntlmssp_server_auth: Failed to create NTLM session key.\n"));
+			session_key = data_blob_null;
+		}
+
+	} else if (user_session_key.data) {
+		session_key = user_session_key;
+		DEBUG(10,("ntlmssp_server_auth: Using unmodified nt session key.\n"));
+		dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
+
+		/* LM Key not selected */
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
+	} else if (lm_session_key.data) {
+		/* Very weird to have LM key, but no user session key, but anyway.. */
+		session_key = lm_session_key;
+		DEBUG(10,("ntlmssp_server_auth: Using unmodified lm session key.\n"));
+		dump_data_pw("unmodified session key:\n", session_key.data, session_key.length);
+
+		/* LM Key not selected */
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+
+	} else {
+		DEBUG(10,("ntlmssp_server_auth: Failed to create unmodified session key.\n"));
+		session_key = data_blob_null;
+
+		/* LM Key not selected */
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+	}
+
+	/* With KEY_EXCH, the client supplies the proposed session key,
+	   but encrypts it with the long-term key */
+	if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
+		if (!state->encrypted_session_key.data
+		    || state->encrypted_session_key.length != 16) {
+			DEBUG(1, ("Client-supplied KEY_EXCH session key was of invalid length (%u)!\n",
+				  (unsigned)state->encrypted_session_key.length));
+			return NT_STATUS_INVALID_PARAMETER;
+		} else if (!session_key.data || session_key.length != 16) {
+			DEBUG(5, ("server session key is invalid (len == %u), cannot do KEY_EXCH!\n",
+				  (unsigned int)session_key.length));
+			ntlmssp_state->session_key = session_key;
+			talloc_steal(ntlmssp_state, session_key.data);
+		} else {
+			gnutls_cipher_hd_t cipher_hnd;
+			gnutls_datum_t enc_session_key = {
+				.data = session_key.data,
+				.size = session_key.length,
+			};
+			int rc;
+
+			dump_data_pw("KEY_EXCH session key (enc):\n",
+				     state->encrypted_session_key.data,
+				     state->encrypted_session_key.length);
+
+			rc = gnutls_cipher_init(&cipher_hnd,
+						GNUTLS_CIPHER_ARCFOUR_128,
+						&enc_session_key,
+						NULL);
+			if (rc < 0) {
+				return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+			}
+			rc = gnutls_cipher_encrypt(cipher_hnd,
+						   state->encrypted_session_key.data,
+						   state->encrypted_session_key.length);
+			gnutls_cipher_deinit(cipher_hnd);
+			if (rc < 0) {
+				return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+			}
+
+			ntlmssp_state->session_key = data_blob_talloc(ntlmssp_state,
+								      state->encrypted_session_key.data,
+								      state->encrypted_session_key.length);
+			dump_data_pw("KEY_EXCH session key:\n",
+				     state->encrypted_session_key.data,
+				     state->encrypted_session_key.length);
+		}
+	} else {
+		ntlmssp_state->session_key = session_key;
+		talloc_steal(ntlmssp_state, session_key.data);
+	}
+
+	if (ntlmssp_state->new_spnego) {
+		gnutls_hmac_hd_t hmac_hnd = NULL;
+		uint8_t mic_buffer[NTLMSSP_MIC_SIZE] = { 0, };
+		bool cmp;
+		int rc;
+
+		rc = gnutls_hmac_init(&hmac_hnd,
+				 GNUTLS_MAC_MD5,
+				 ntlmssp_state->session_key.data,
+				 MIN(ntlmssp_state->session_key.length, 64));
+		if (rc < 0) {
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+		rc = gnutls_hmac(hmac_hnd,
+				 ntlmssp_state->negotiate_blob.data,
+				 ntlmssp_state->negotiate_blob.length);
+		if (rc < 0) {
+			gnutls_hmac_deinit(hmac_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+		rc = gnutls_hmac(hmac_hnd,
+				  ntlmssp_state->challenge_blob.data,
+				  ntlmssp_state->challenge_blob.length);
+		if (rc < 0) {
+			gnutls_hmac_deinit(hmac_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+
+		/* checked were we set ntlmssp_state->new_spnego */
+		SMB_ASSERT(request.length >
+			   (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE));
+
+		rc = gnutls_hmac(hmac_hnd, request.data, NTLMSSP_MIC_OFFSET);
+		if (rc < 0) {
+			gnutls_hmac_deinit(hmac_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+		rc = gnutls_hmac(hmac_hnd, mic_buffer, NTLMSSP_MIC_SIZE);
+		if (rc < 0) {
+			gnutls_hmac_deinit(hmac_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+		rc = gnutls_hmac(hmac_hnd,
+				 request.data + (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE),
+				 request.length - (NTLMSSP_MIC_OFFSET + NTLMSSP_MIC_SIZE));
+		if (rc < 0) {
+			gnutls_hmac_deinit(hmac_hnd, NULL);
+			return gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
+		}
+		gnutls_hmac_deinit(hmac_hnd, mic_buffer);
+
+		cmp = mem_equal_const_time(request.data + NTLMSSP_MIC_OFFSET,
+					   mic_buffer, NTLMSSP_MIC_SIZE);
+		if (!cmp) {
+			DEBUG(1,("%s: invalid NTLMSSP_MIC for "
+				 "user=[%s] domain=[%s] workstation=[%s]\n",
+				 __func__,
+				 ntlmssp_state->user,
+				 ntlmssp_state->domain,
+				 ntlmssp_state->client.netbios_name));
+			dump_data(11, request.data + NTLMSSP_MIC_OFFSET,
+				  NTLMSSP_MIC_SIZE);
+			dump_data(11, mic_buffer,
+				  NTLMSSP_MIC_SIZE);
+		}
+
+		ZERO_ARRAY(mic_buffer);
+
+		if (!cmp) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+	}
+
+	data_blob_free(&ntlmssp_state->negotiate_blob);
+	data_blob_free(&ntlmssp_state->challenge_blob);
+
+	if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
+		if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) {
+			/*
+			 * We need to handle NTLMSSP_NEGOTIATE_SIGN as
+			 * NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE
+			 * is requested.
+			 */
+			ntlmssp_state->force_wrap_seal = true;
+		}
+		nt_status = ntlmssp_sign_init(ntlmssp_state);
+	}
+
+	data_blob_clear_free(&ntlmssp_state->internal_chal);
+	data_blob_clear_free(&ntlmssp_state->chal);
+	data_blob_clear_free(&ntlmssp_state->lm_resp);
+	data_blob_clear_free(&ntlmssp_state->nt_resp);
+
+	ntlmssp_state->expected_state = NTLMSSP_DONE;
+
+	return nt_status;
+}
+
+NTSTATUS ntlmssp_server_auth_recv(struct tevent_req *req,
+				  TALLOC_CTX *out_mem_ctx,
+				  DATA_BLOB *out)
+{
+	NTSTATUS status;
+
+	*out = data_blob_null;
+
+	if (tevent_req_is_nterror(req, &status)) {
+		tevent_req_received(req);
+		return status;
+	}
+
+	tevent_req_received(req);
+	return NT_STATUS_OK;
+}