1 files changed, 582 insertions, 0 deletions

diff --git a/auth/ntlmssp/ntlmssp_server.c b/auth/ntlmssp/ntlmssp_server.c
new file mode 100644
index 0000000000..b190cf3ab7
--- /dev/null
+++ b/auth/ntlmssp/ntlmssp_server.c
@@ -0,0 +1,582 @@
+/*
+   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 "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 "../lib/crypto/crypto.h"
+
+/**
+ * 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 Negotiate packet
+ *
+ * @param ntlmssp_state NTLMSSP 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 ntlmssp_server_negotiate(struct ntlmssp_state *ntlmssp_state,
+				  TALLOC_CTX *out_mem_ctx,
+				  const DATA_BLOB request, DATA_BLOB *reply)
+{
+	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;
+
+	/* parse the NTLMSSP packet */
+#if 0
+	file_save("ntlmssp_negotiate.dat", request.data, request.length);
+#endif
+
+	if (request.length) {
+		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);
+			}
+		}
+	}
+
+	ntlmssp_handle_neg_flags(ntlmssp_state, neg_flags, ntlmssp_state->allow_lm_key);
+
+	/* Ask our caller what challenge they would like in the packet */
+	status = ntlmssp_state->get_challenge(ntlmssp_state, cryptkey);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("ntlmssp_server_negotiate: backend doesn't give a challenge: %s\n",
+			  nt_errstr(status)));
+		return status;
+	}
+
+	/* Check if we may set the challenge */
+	if (!ntlmssp_state->may_set_challenge(ntlmssp_state)) {
+		ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
+	}
+
+	/* The flags we send back are not just the negotiated flags,
+	 * they are also 'what is in this packet'.  Therfore, we
+	 * operate on 'chal_flags' from here on
+	 */
+
+	chal_flags = ntlmssp_state->neg_flags;
+
+	/* 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)
+	{
+		status = msrpc_gen(ntlmssp_state, &struct_blob, "aaaaa",
+			  MsvAvNbDomainName, target_name,
+			  MsvAvNbComputerName, ntlmssp_state->server.netbios_name,
+			  MsvAvDnsDomainName, ntlmssp_state->server.dns_domain,
+			  MsvAvDnsComputerName, ntlmssp_state->server.dns_name,
+			  MsvAvEOL, "");
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+	} else {
+		struct_blob = data_blob_null;
+	}
+
+	{
+		/* Marshal the packet in the right format, be it unicode or ASCII */
+		const char *gen_string;
+		DATA_BLOB version_blob = data_blob_null;
+
+		if (chal_flags & NTLMSSP_NEGOTIATE_VERSION) {
+			enum ndr_err_code err;
+			struct ntlmssp_VERSION vers;
+
+			/* "What Windows returns" as a version number. */
+			ZERO_STRUCT(vers);
+			vers.ProductMajorVersion = NTLMSSP_WINDOWS_MAJOR_VERSION_6;
+			vers.ProductMinorVersion = NTLMSSP_WINDOWS_MINOR_VERSION_1;
+			vers.ProductBuild = 0;
+			vers.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
+
+			err = ndr_push_struct_blob(&version_blob,
+						ntlmssp_state,
+						&vers,
+						(ndr_push_flags_fn_t)ndr_push_ntlmssp_VERSION);
+
+			if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
+				data_blob_free(&struct_blob);
+				return NT_STATUS_NO_MEMORY;
+			}
+		}
+
+		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(&version_blob);
+			data_blob_free(&struct_blob);
+			return status;
+		}
+
+		data_blob_free(&version_blob);
+
+		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->expected_state = NTLMSSP_AUTH;
+
+	return NT_STATUS_MORE_PROCESSING_REQUIRED;
+}
+
+struct ntlmssp_server_auth_state {
+	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];
+};
+
+/**
+ * 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 ntlmssp_state *ntlmssp_state,
+				       struct ntlmssp_server_auth_state *state,
+				       const DATA_BLOB request)
+{
+	uint32_t ntlmssp_command, auth_flags;
+	NTSTATUS nt_status;
+
+	uint8_t session_nonce_hash[16];
+
+	const char *parse_string;
+
+#if 0
+	file_save("ntlmssp_auth.dat", request.data, request.length);
+#endif
+
+	if (ntlmssp_state->unicode) {
+		parse_string = "CdBBUUUBd";
+	} else {
+		parse_string = "CdBBAAABd";
+	}
+
+	/* 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 */
+	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,
+			 &state->encrypted_session_key,
+			 &auth_flags)) {
+		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)
+		ntlmssp_handle_neg_flags(ntlmssp_state, auth_flags, ntlmssp_state->allow_lm_key);
+
+	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
+
+	/* 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) {
+			struct MD5Context md5_session_nonce_ctx;
+			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);
+
+			MD5Init(&md5_session_nonce_ctx);
+			MD5Update(&md5_session_nonce_ctx, state->session_nonce, 16);
+			MD5Final(session_nonce_hash, &md5_session_nonce_ctx);
+
+			ntlmssp_state->chal = data_blob_talloc(
+				ntlmssp_state, session_nonce_hash, 8);
+
+			/* LM response is no longer useful */
+			data_blob_free(&ntlmssp_state->lm_resp);
+
+			/* We changed the effective challenge - set it */
+			if (!NT_STATUS_IS_OK(nt_status = ntlmssp_state->set_challenge(ntlmssp_state, &ntlmssp_state->chal))) {
+				return nt_status;
+			}
+
+			/* LM Key is incompatible. */
+			ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
+		}
+	}
+	return NT_STATUS_OK;
+}
+
+/**
+ * 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 ntlmssp_state *ntlmssp_state,
+					struct ntlmssp_server_auth_state *state)
+{
+	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);
+
+	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) {
+			session_key = data_blob_talloc(ntlmssp_state,
+						       NULL, 16);
+			hmac_md5(user_session_key.data, state->session_nonce,
+				 sizeof(state->session_nonce), session_key.data);
+			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;
+				}
+				SMBsesskeygen_lm_sess_key(lm_session_key.data, ntlmssp_state->lm_resp.data,
+							  session_key.data);
+				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;
+				}
+				SMBsesskeygen_lm_sess_key(zeros, zeros,
+							  session_key.data);
+				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 {
+			dump_data_pw("KEY_EXCH session key (enc):\n",
+				     state->encrypted_session_key.data,
+				     state->encrypted_session_key.length);
+			arcfour_crypt(state->encrypted_session_key.data,
+				      session_key.data,
+				      state->encrypted_session_key.length);
+			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->session_key.length) {
+		nt_status = ntlmssp_sign_init(ntlmssp_state);
+	}
+
+	ntlmssp_state->expected_state = NTLMSSP_DONE;
+
+	return nt_status;
+}
+
+
+/**
+ * Next state function for the Authenticate 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 NT_STATUS_OK if authentication sucessful
+ */
+
+NTSTATUS ntlmssp_server_auth(struct ntlmssp_state *ntlmssp_state,
+			     TALLOC_CTX *out_mem_ctx,
+			     const DATA_BLOB in, DATA_BLOB *out)
+{
+	struct ntlmssp_server_auth_state *state;
+	NTSTATUS nt_status;
+
+	/* zero the outbound NTLMSSP packet */
+	*out = data_blob_null;
+
+	state = talloc_zero(ntlmssp_state, struct ntlmssp_server_auth_state);
+	if (state == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	nt_status = ntlmssp_server_preauth(ntlmssp_state, state, in);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		TALLOC_FREE(state);
+		return nt_status;
+	}
+
+	/*
+	 * Note we don't check here for NTLMv2 auth settings. If NTLMv2 auth
+	 * is required (by "ntlm auth = no" and "lm auth = no" being set in the
+	 * smb.conf file) and no NTLMv2 response was sent then the password check
+	 * will fail here. JRA.
+	 */
+
+	/* Finally, actually ask if the password is OK */
+	nt_status = ntlmssp_state->check_password(ntlmssp_state,
+						  state,
+						  &state->user_session_key,
+						  &state->lm_session_key);
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		TALLOC_FREE(state);
+		return nt_status;
+	}
+
+	/* When we get more async in the auth code behind
+	   ntlmssp_state->check_password, the ntlmssp_server_postpath
+	   can be done in a callback */
+
+	nt_status = ntlmssp_server_postauth(ntlmssp_state, state);
+	TALLOC_FREE(state);
+	return nt_status;
+}