[CIFS] Fix packet signatures for NTLMv2 case

Signed-off-by: Yehuda Sadeh Weinraub <Yehuda.Sadeh@expand.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/CHANGES

+Version 1.50
+------------
+Fix NTLMv2 signing
+
 Version 1.49
 ------------
 IPv6 support.  Enable ipv6 addresses to be passed on mount (put the ipv6

fs/cifs/TODO

@@ -18,9 +18,9 @@ better)
 
 d) Kerberos/SPNEGO session setup support - (started)
 
-e) More testing of NTLMv2 authentication (mostly implemented - double check
-that NTLMv2 signing works, also need to cleanup now unneeded SessSetup code in
-fs/cifs/connect.c)
+e) Cleanup now unneeded SessSetup code in
+fs/cifs/connect.c and add back in NTLMSSP code if any servers
+need it
 
 f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup 
 used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM

fs/cifs/cifsencrypt.c

@@ -41,16 +41,17 @@ extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
 		       unsigned char *p24);
 	
 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
-				    const char *key, char *signature)
+				    const struct mac_key *key, char *signature)
 {
 	struct	MD5Context context;
 
-	if ((cifs_pdu == NULL) || (signature == NULL))
+	if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
 		return -EINVAL;
 
 	MD5Init(&context);
-	MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
+	MD5Update(&context, (char *)&key->data, key->len);
 	MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
+
 	MD5Final(signature, &context);
 	return 0;
 }
@@ -76,7 +77,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 	server->sequence_number++;
 	spin_unlock(&GlobalMid_Lock);
 
-	rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,
+	rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
 				      smb_signature);
 	if (rc)
 		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -87,16 +88,16 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 }
 
 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
-				const char *key, char *signature)
+				const struct mac_key *key, char *signature)
 {
 	struct  MD5Context context;
 	int i;
 
-	if ((iov == NULL) || (signature == NULL))
+	if ((iov == NULL) || (signature == NULL) || (key == NULL))
 		return -EINVAL;
 
 	MD5Init(&context);
-	MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
+	MD5Update(&context, (char *)&key->data, key->len);
 	for (i=0;i<n_vec;i++) {
 		if (iov[i].iov_base == NULL) {
 			cERROR(1 ,("null iovec entry"));
@@ -141,7 +142,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 	server->sequence_number++;
 	spin_unlock(&GlobalMid_Lock);
 
-	rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
+	rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
 				      smb_signature);
 	if (rc)
 		memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -151,7 +152,8 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 	return rc;
 }
 
-int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key,
+int cifs_verify_signature(struct smb_hdr *cifs_pdu,
+			  const struct mac_key *mac_key,
 			  __u32 expected_sequence_number)
 {
 	unsigned int rc;
@@ -202,15 +204,17 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key,
 }
 
 /* We fill in key by putting in 40 byte array which was allocated by caller */
-int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
+int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+			   const char *password)
 {
 	char temp_key[16];
 	if ((key == NULL) || (rn == NULL))
 		return -EINVAL;
 
 	E_md4hash(password, temp_key);
-	mdfour(key,temp_key,16);
-	memcpy(key+16,rn, CIFS_SESS_KEY_SIZE);
+	mdfour(key->data.ntlm, temp_key, 16);
+	memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
+	key->len = 40;
 	return 0;
 }
 
@@ -235,35 +239,35 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
 	if(ses->domainName == NULL)
 		return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
 	dom_name_len = strlen(ses->domainName);
-	if(dom_name_len > MAX_USERNAME_SIZE)
+	if (dom_name_len > MAX_USERNAME_SIZE)
 		return -EINVAL;
   
 	ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
-	if(ucase_buf == NULL)
+	if (ucase_buf == NULL)
 		return -ENOMEM;
 	unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
-	if(unicode_buf == NULL) {
+	if (unicode_buf == NULL) {
 		kfree(ucase_buf);
 		return -ENOMEM;
 	}
    
-	for(i=0;i<user_name_len;i++)
+	for (i = 0;i < user_name_len; i++)
 		ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
 	ucase_buf[i] = 0;
 	user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
 	unicode_buf[user_name_len] = 0;
 	user_name_len++;
 
-	for(i=0;i<dom_name_len;i++)
+	for (i = 0; i < dom_name_len; i++)
 		ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
 	ucase_buf[i] = 0;
 	dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
 
 	unicode_buf[user_name_len + dom_name_len] = 0;
 	hmac_md5_update((const unsigned char *) unicode_buf,
-		(user_name_len+dom_name_len)*2,&ctx);
+		(user_name_len+dom_name_len)*2, &ctx);
 
-	hmac_md5_final(ses->server->mac_signing_key,&ctx);
+	hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
 	kfree(ucase_buf);
 	kfree(unicode_buf);
 	return 0;
@@ -347,7 +351,10 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
 		if(domain == NULL)
 			goto calc_exit_1;
 		len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
-		UniStrupr(domain);
+		/* the following line was removed since it didn't work well
+		   with lower cased domain name that passed as an option.
+		   Maybe converting the domain name earlier makes sense */
+		/* UniStrupr(domain); */
 
 		hmac_md5_update((char *)domain, 2*len, pctxt);
 	
@@ -358,7 +365,7 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
 calc_exit_2:
 	/* BB FIXME what about bytes 24 through 40 of the signing key? 
 	   compare with the NTLM example */
-	hmac_md5_final(ses->server->mac_signing_key, pctxt);
+	hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
 
 	return rc;
 }
@@ -368,6 +375,7 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
 {
 	int rc;
 	struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
+	struct HMACMD5Context context;
 
 	buf->blob_signature = cpu_to_le32(0x00000101);
 	buf->reserved = 0;
@@ -384,6 +392,15 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
 	if(rc)
 		cERROR(1,("could not get v2 hash rc %d",rc));
 	CalcNTLMv2_response(ses, resp_buf);
+
+	/* now calculate the MAC key for NTLMv2 */
+	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
+	hmac_md5_update(resp_buf, 16, &context);
+	hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
+
+	memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
+	       sizeof(struct ntlmv2_resp));
+	ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
 }
 
 void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
@@ -391,7 +408,7 @@ void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_respo
 	struct HMACMD5Context context;
 	/* rest of v2 struct already generated */
 	memcpy(v2_session_response + 8, ses->server->cryptKey,8);
-	hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
+	hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
 
 	hmac_md5_update(v2_session_response+8,
 			sizeof(struct ntlmv2_resp) - 8, &context);

fs/cifs/cifsglob.h

@@ -104,6 +104,17 @@ enum protocolEnum {
 	/* Netbios frames protocol not supported at this time */
 };
 
+struct mac_key {
+	unsigned int len;
+	union {
+		char ntlm[CIFS_SESS_KEY_SIZE + 16];
+		struct {
+			char key[16];
+			struct ntlmv2_resp resp;
+		} ntlmv2;
+	} data;
+};
+
 /*
  *****************************************************************
  * Except the CIFS PDUs themselves all the
@@ -159,7 +170,8 @@ struct TCP_Server_Info {
 	/* 16th byte of RFC1001 workstation name is always null */
 	char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
 	__u32 sequence_number; /* needed for CIFS PDU signature */
-	char mac_signing_key[CIFS_SESS_KEY_SIZE + 16];
+	struct mac_key mac_signing_key;
+	char ntlmv2_hash[16];
 	unsigned long lstrp; /* when we got last response from this server */
 };
 

fs/cifs/cifsproto.h

@@ -294,9 +294,11 @@ extern void tconInfoFree(struct cifsTconInfo *);
 extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *, __u32 *);
 extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
 			  __u32 *);
-extern int cifs_verify_signature(struct smb_hdr *, const char *mac_key,
+extern int cifs_verify_signature(struct smb_hdr *,
+				 const struct mac_key *mac_key,
 				__u32 expected_sequence_number);
-extern int cifs_calculate_mac_key(char *key, const char *rn, const char *pass);
+extern int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+				 const char *pass);
 extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *,
 			const struct nls_table *);
 extern void CalcNTLMv2_response(const struct cifsSesInfo *, char * );

fs/cifs/connect.c

@@ -3475,7 +3475,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
 
 					if(first_time)
 						cifs_calculate_mac_key(
-							pSesInfo->server->mac_signing_key,
+							&pSesInfo->server->mac_signing_key,
 							ntlm_session_key,
 							pSesInfo->password);
 				}
@@ -3495,7 +3495,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
 
 			if(first_time) 		
 				cifs_calculate_mac_key(
-					pSesInfo->server->mac_signing_key,
+					&pSesInfo->server->mac_signing_key,
 					ntlm_session_key, pSesInfo->password);
 
 			rc = CIFSSessSetup(xid, pSesInfo,

fs/cifs/sess.c

@@ -419,7 +419,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 
 		if (first_time) /* should this be moved into common code
 				  with similar ntlmv2 path? */
-			cifs_calculate_mac_key(ses->server->mac_signing_key,
+			cifs_calculate_mac_key(&ses->server->mac_signing_key,
 				ntlm_session_key, ses->password);
 		/* copy session key */
 

fs/cifs/transport.c

@@ -559,7 +559,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
 			   (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 					SECMODE_SIGN_ENABLED))) {
 				rc = cifs_verify_signature(midQ->resp_buf,
-						ses->server->mac_signing_key,
+						&ses->server->mac_signing_key,
 						midQ->sequence_number+1);
 				if (rc) {
 					cERROR(1, ("Unexpected SMB signature"));
@@ -738,7 +738,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
 			   (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 					SECMODE_SIGN_ENABLED))) {
 				rc = cifs_verify_signature(out_buf,
-						ses->server->mac_signing_key,
+						&ses->server->mac_signing_key,
 						midQ->sequence_number+1);
 				if (rc) {
 					cERROR(1, ("Unexpected SMB signature"));
@@ -982,7 +982,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
 			   (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
 					SECMODE_SIGN_ENABLED))) {
 				rc = cifs_verify_signature(out_buf,
-						ses->server->mac_signing_key,
+						&ses->server->mac_signing_key,
 						midQ->sequence_number+1);
 				if (rc) {
 					cERROR(1, ("Unexpected SMB signature"));