Finally get NTLMv2 working on the client!

With big thanks to tpot for the ethereal disector, and for the base code
behind this, we now fully support NTLMv2 as a client.

In particular, we support it with direct domain logons (tested with ntlm_auth
--diagnostics), with 'old style' session setups, and with NTLMSSP.

In fact, for NTLMSSP we recycle one of the parts of the server's reply directly...

(we might need to parse for unicode issues later).

In particular, a Win2k domain controller now supplies us with a session key
for this password, which means that doman joins, and non-spnego SMB signing
are now supported with NTLMv2!

Andrew Bartlett
(This used to be commit 9f6a26769d345d319ec167cd0e82a45e1207ed81)

3 files changed, 102 insertions, 35 deletions

diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c
index 982cbfff06..f58a458aba 100644
--- a/source3/libsmb/cliconnect.c
+++ b/source3/libsmb/cliconnect.c
@@ -257,14 +257,23 @@ static BOOL cli_session_setup_nt1(struct cli_state *cli, const char *user,
 	if (passlen != 24) {
 		if (lp_client_ntlmv2_auth()) {
 			DATA_BLOB server_chal;
-
+			DATA_BLOB names_blob;
 			server_chal = data_blob(cli->secblob.data, MIN(cli->secblob.length, 8)); 
 
-			if (!SMBNTLMv2encrypt(user, workgroup, pass, server_chal, 
-					      &lm_response, &nt_response, NULL, &session_key)) {
+			/* note that the 'workgroup' here is a best guess - we don't know
+			   the server's domain at this point.  The 'server name' is also
+			   dodgy... 
+			*/
+			names_blob = NTLMv2_generate_names_blob(cli->called.name, workgroup);
+
+			if (!SMBNTLMv2encrypt(user, workgroup, pass, &server_chal, 
+					      &names_blob,
+					      &lm_response, &nt_response, &session_key)) {
+				data_blob_free(&names_blob);
 				data_blob_free(&server_chal);
 				return False;
 			}
+			data_blob_free(&names_blob);
 			data_blob_free(&server_chal);
 
 		} else {
diff --git a/source3/libsmb/ntlmssp.c b/source3/libsmb/ntlmssp.c
index 356bb0c4fe..636e384e65 100644
--- a/source3/libsmb/ntlmssp.c
+++ b/source3/libsmb/ntlmssp.c
@@ -487,9 +487,8 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_client_state *ntlmssp_st
 	}
 
 	SAFE_FREE(server_domain);
-	data_blob_free(&struct_blob);
-	
 	if (challenge_blob.length != 8) {
+		data_blob_free(&struct_blob);
 		return NT_STATUS_INVALID_PARAMETER;
 	}
 
@@ -500,9 +499,11 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_client_state *ntlmssp_st
 		
 		if (!SMBNTLMv2encrypt(ntlmssp_state->user, 
 				      ntlmssp_state->domain, 
-				      ntlmssp_state->password, challenge_blob, 
-				      &lm_response, &nt_response, NULL, &session_key)) {
+				      ntlmssp_state->password, &challenge_blob, 
+				      &struct_blob, 
+				      &lm_response, &nt_response, &session_key)) {
 			data_blob_free(&challenge_blob);
+			data_blob_free(&struct_blob);
 			return NT_STATUS_NO_MEMORY;
 		}
 	} else {
@@ -522,6 +523,7 @@ static NTSTATUS ntlmssp_client_challenge(struct ntlmssp_client_state *ntlmssp_st
 		session_key = data_blob(NULL, 16);
 		SMBsesskeygen_ntv1(nt_hash, NULL, session_key.data);
 	}
+	data_blob_free(&struct_blob);
 
 	/* this generates the actual auth packet */
 	if (!msrpc_gen(next_request, auth_gen_string, 
diff --git a/source3/libsmb/smbencrypt.c b/source3/libsmb/smbencrypt.c
index bab18a07b1..c1b3880299 100644
--- a/source3/libsmb/smbencrypt.c
+++ b/source3/libsmb/smbencrypt.c
@@ -249,21 +249,21 @@ BOOL make_oem_passwd_hash(char data[516], const char *passwd, uchar old_pw_hash[
 
 /* Does the md5 encryption from the NT hash for NTLMv2. */
 void SMBOWFencrypt_ntv2(const uchar kr[16],
-			const DATA_BLOB srv_chal,
-			const DATA_BLOB cli_chal,
+			const DATA_BLOB *srv_chal,
+			const DATA_BLOB *cli_chal,
 			uchar resp_buf[16])
 {
 	HMACMD5Context ctx;
 
 	hmac_md5_init_limK_to_64(kr, 16, &ctx);
-	hmac_md5_update(srv_chal.data, srv_chal.length, &ctx);
-	hmac_md5_update(cli_chal.data, cli_chal.length, &ctx);
+	hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
+	hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
 	hmac_md5_final(resp_buf, &ctx);
 
 #ifdef DEBUG_PASSWORD
 	DEBUG(100, ("SMBOWFencrypt_ntv2: srv_chal, cli_chal, resp_buf\n"));
-	dump_data(100, srv_chal.data, srv_chal.length);
-	dump_data(100, cli_chal.data, cli_chal.length);
+	dump_data(100, srv_chal->data, srv_chal->length);
+	dump_data(100, cli_chal->data, cli_chal->length);
 	dump_data(100, resp_buf, 16);
 #endif
 }
@@ -294,36 +294,98 @@ void SMBsesskeygen_ntv1(const uchar kr[16],
 #endif
 }
 
-static DATA_BLOB NTLMv2_generate_response(uchar ntlm_v2_hash[16],
-				   DATA_BLOB server_chal, size_t client_chal_length)
+DATA_BLOB NTLMv2_generate_names_blob(const char *hostname, 
+				     const char *domain)
+{
+	DATA_BLOB names_blob = data_blob(NULL, 0);
+	
+	msrpc_gen(&names_blob, "aaa", 
+		  True, NTLMSSP_NAME_TYPE_DOMAIN, domain,
+		  True, NTLMSSP_NAME_TYPE_SERVER, hostname,
+		  True, 0, "");
+	return names_blob;
+}
+
+static DATA_BLOB NTLMv2_generate_client_data(const DATA_BLOB *names_blob) 
+{
+	uchar client_chal[8];
+	DATA_BLOB response = data_blob(NULL, 0);
+	char long_date[8];
+
+	generate_random_buffer(client_chal, sizeof(client_chal), False);
+
+	put_long_date(long_date, time(NULL));
+
+	/* See http://www.ubiqx.org/cifs/SMB.html#SMB.8.5 */
+
+	msrpc_gen(&response, "ddbbdb", 
+		  0x00000101,     /* Header  */
+		  0,              /* 'Reserved'  */
+		  long_date, 8,	  /* Timestamp */
+		  client_chal, 8, /* client challenge */
+		  0,		  /* Unknown */
+		  names_blob->data, names_blob->length);	/* End of name list */
+
+	return response;
+}
+
+static DATA_BLOB NTLMv2_generate_response(const uchar ntlm_v2_hash[16],
+					  const DATA_BLOB *server_chal,
+					  const DATA_BLOB *names_blob)
 {
 	uchar ntlmv2_response[16];
 	DATA_BLOB ntlmv2_client_data;
 	DATA_BLOB final_response;
 	
 	/* NTLMv2 */
+	/* generate some data to pass into the response function - including
+	   the hostname and domain name of the server */
+	ntlmv2_client_data = NTLMv2_generate_client_data(names_blob);
 
-	/* We also get to specify some random data */
-	ntlmv2_client_data = data_blob(NULL, client_chal_length);
-	generate_random_buffer(ntlmv2_client_data.data, ntlmv2_client_data.length, False);
-	
 	/* Given that data, and the challenge from the server, generate a response */
-	SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, ntlmv2_client_data, ntlmv2_response);
+	SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &ntlmv2_client_data, ntlmv2_response);
 	
-	/* put it into nt_response, for the code below to put into the packet */
-	final_response = data_blob(NULL, ntlmv2_client_data.length + sizeof(ntlmv2_response));
+	final_response = data_blob(NULL, sizeof(ntlmv2_response) + ntlmv2_client_data.length);
+
 	memcpy(final_response.data, ntlmv2_response, sizeof(ntlmv2_response));
-	/* after the first 16 bytes is the random data we generated above, so the server can verify us with it */
-	memcpy(final_response.data + sizeof(ntlmv2_response), ntlmv2_client_data.data, ntlmv2_client_data.length);
+
+	memcpy(final_response.data+sizeof(ntlmv2_response), 
+	       ntlmv2_client_data.data, ntlmv2_client_data.length);
+
 	data_blob_free(&ntlmv2_client_data);
 
 	return final_response;
 }
 
+static DATA_BLOB LMv2_generate_response(const uchar ntlm_v2_hash[16],
+					const DATA_BLOB *server_chal)
+{
+	uchar lmv2_response[16];
+	DATA_BLOB lmv2_client_data = data_blob(NULL, 8);
+	DATA_BLOB final_response = data_blob(NULL, 24);
+	
+	/* LMv2 */
+	/* client-supplied random data */
+	generate_random_buffer(lmv2_client_data.data, lmv2_client_data.length, False);	
+
+	/* Given that data, and the challenge from the server, generate a response */
+	SMBOWFencrypt_ntv2(ntlm_v2_hash, server_chal, &lmv2_client_data, lmv2_response);
+	memcpy(final_response.data, lmv2_response, sizeof(lmv2_response));
+
+	/* after the first 16 bytes is the random data we generated above, 
+	   so the server can verify us with it */
+	memcpy(final_response.data+sizeof(lmv2_response), 
+	       lmv2_client_data.data, lmv2_client_data.length);
+
+	data_blob_free(&lmv2_client_data);
+
+	return final_response;
+}
+
 BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password, 
-		      const DATA_BLOB server_chal, 
+		      const DATA_BLOB *server_chal, 
+		      const DATA_BLOB *names_blob,
 		      DATA_BLOB *lm_response, DATA_BLOB *nt_response, 
-		      DATA_BLOB *lm_session_key, 
 		      DATA_BLOB *nt_session_key) 
 {
 	uchar nt_hash[16];
@@ -339,7 +401,8 @@ BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password
 	}
 	
 	if (nt_response) {
-		*nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 64 /* pick a number, > 8 */);
+		*nt_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal,
+							names_blob); 
 		if (nt_session_key) {
 			*nt_session_key = data_blob(NULL, 16);
 			
@@ -352,14 +415,7 @@ BOOL SMBNTLMv2encrypt(const char *user, const char *domain, const char *password
 	/* LMv2 */
 	
 	if (lm_response) {
-		*lm_response = NTLMv2_generate_response(ntlm_v2_hash, server_chal, 8);
-		if (lm_session_key) {
-			*lm_session_key = data_blob(NULL, 16);
-			
-			/* The NTLMv2 calculations also provide a session key, for signing etc later */
-			/* use only the first 16 bytes of nt_response for session key */
-			SMBsesskeygen_ntv2(ntlm_v2_hash, lm_response->data, lm_session_key->data);
-		}
+		*lm_response = LMv2_generate_response(ntlm_v2_hash, server_chal);
 	}
 	
 	return True;